tty/synclinkmp.c

   1 /*
   2  * $Id: synclinkmp.c,v 4.38 2005/07/15 13:29:44 paulkf Exp $
   3  *
   4  * Device driver for Microgate SyncLink Multiport
   5  * high speed multiprotocol serial adapter.
   6  *
   7  * written by Paul Fulghum for Microgate Corporation
   8  * paulkf@microgate.com
   9  *
  10  * Microgate and SyncLink are trademarks of Microgate Corporation
  11  *
  12  * Derived from serial.c written by Theodore Ts'o and Linus Torvalds
  13  * This code is released under the GNU General Public License (GPL)
  14  *
  15  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
  16  * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  17  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  18  * DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
  19  * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
  20  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
  21  * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  22  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
  23  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  24  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
  25  * OF THE POSSIBILITY OF SUCH DAMAGE.
  26  */
  27
  28 #define VERSION(ver,rel,seq) (((ver)<<16) | ((rel)<<8) | (seq))
  29 #if defined(__i386__)
  30 #  define BREAKPOINT() asm("   int $3");
  31 #else
  32 #  define BREAKPOINT() { }
  33 #endif
  34
  35 #define MAX_DEVICES 12
  36
  37 #include <linux/module.h>
  38 #include <linux/errno.h>
  39 #include <linux/signal.h>
  40 #include <linux/sched.h>
  41 #include <linux/timer.h>
  42 #include <linux/interrupt.h>
  43 #include <linux/pci.h>
  44 #include <linux/tty.h>
  45 #include <linux/tty_flip.h>
  46 #include <linux/serial.h>
  47 #include <linux/major.h>
  48 #include <linux/string.h>
  49 #include <linux/fcntl.h>
  50 #include <linux/ptrace.h>
  51 #include <linux/ioport.h>
  52 #include <linux/mm.h>
  53 #include <linux/seq_file.h>
  54 #include <linux/slab.h>
  55 #include <linux/netdevice.h>
  56 #include <linux/vmalloc.h>
  57 #include <linux/init.h>
  58 #include <linux/delay.h>
  59 #include <linux/ioctl.h>
  60
  61 #include <asm/io.h>
  62 #include <asm/irq.h>
  63 #include <asm/dma.h>
  64 #include <linux/bitops.h>
  65 #include <asm/types.h>
  66 #include <linux/termios.h>
  67 #include <linux/workqueue.h>
  68 #include <linux/hdlc.h>
  69 #include <linux/synclink.h>
  70
  71 #if defined(CONFIG_HDLC) || (defined(CONFIG_HDLC_MODULE) && defined(CONFIG_SYNCLINKMP_MODULE))
  72 #define SYNCLINK_GENERIC_HDLC 1
  73 #else
  74 #define SYNCLINK_GENERIC_HDLC 0
  75 #endif
  76
  77 #define GET_USER(error,value,addr) error = get_user(value,addr)
  78 #define COPY_FROM_USER(error,dest,src,size) error = copy_from_user(dest,src,size) ? -EFAULT : 0
  79 #define PUT_USER(error,value,addr) error = put_user(value,addr)
  80 #define COPY_TO_USER(error,dest,src,size) error = copy_to_user(dest,src,size) ? -EFAULT : 0
  81
  82 #include <asm/uaccess.h>
  83
  84 static MGSL_PARAMS default_params = {
  85         MGSL_MODE_HDLC,                 /* unsigned long mode */
  86         0,                              /* unsigned char loopback; */
  87         HDLC_FLAG_UNDERRUN_ABORT15,     /* unsigned short flags; */
  88         HDLC_ENCODING_NRZI_SPACE,       /* unsigned char encoding; */
  89         0,                              /* unsigned long clock_speed; */
  90         0xff,                           /* unsigned char addr_filter; */
  91         HDLC_CRC_16_CCITT,              /* unsigned short crc_type; */
  92         HDLC_PREAMBLE_LENGTH_8BITS,     /* unsigned char preamble_length; */
  93         HDLC_PREAMBLE_PATTERN_NONE,     /* unsigned char preamble; */
  94         9600,                           /* unsigned long data_rate; */
  95         8,                              /* unsigned char data_bits; */
  96         1,                              /* unsigned char stop_bits; */
  97         ASYNC_PARITY_NONE               /* unsigned char parity; */
  98 };
  99
 100 /* size in bytes of DMA data buffers */
 101 #define SCABUFSIZE      1024
 102 #define SCA_MEM_SIZE    0x40000
 103 #define SCA_BASE_SIZE   512
 104 #define SCA_REG_SIZE    16
 105 #define SCA_MAX_PORTS   4
 106 #define SCAMAXDESC      128
 107
 108 #define BUFFERLISTSIZE  4096
 109
 110 /* SCA-I style DMA buffer descriptor */
 111 typedef struct _SCADESC
 112 {
 113         u16     next;           /* lower l6 bits of next descriptor addr */
 114         u16     buf_ptr;        /* lower 16 bits of buffer addr */
 115         u8      buf_base;       /* upper 8 bits of buffer addr */
 116         u8      pad1;
 117         u16     length;         /* length of buffer */
 118         u8      status;         /* status of buffer */
 119         u8      pad2;
 120 } SCADESC, *PSCADESC;
 121
 122 typedef struct _SCADESC_EX
 123 {
 124         /* device driver bookkeeping section */
 125         char    *virt_addr;     /* virtual address of data buffer */
 126         u16     phys_entry;     /* lower 16-bits of physical address of this descriptor */
 127 } SCADESC_EX, *PSCADESC_EX;
 128
 129 /* The queue of BH actions to be performed */
 130
 131 #define BH_RECEIVE  1
 132 #define BH_TRANSMIT 2
 133 #define BH_STATUS   4
 134
 135 #define IO_PIN_SHUTDOWN_LIMIT 100
 136
 137 struct  _input_signal_events {
 138         int     ri_up;
 139         int     ri_down;
 140         int     dsr_up;
 141         int     dsr_down;
 142         int     dcd_up;
 143         int     dcd_down;
 144         int     cts_up;
 145         int     cts_down;
 146 };
 147
 148 /*
 149  * Device instance data structure
 150  */
 151 typedef struct _synclinkmp_info {
 152         void *if_ptr;                           /* General purpose pointer (used by SPPP) */
 153         int                     magic;
 154         struct tty_port         port;
 155         int                     line;
 156         unsigned short          close_delay;
 157         unsigned short          closing_wait;   /* time to wait before closing */
 158
 159         struct mgsl_icount      icount;
 160
 161         int                     timeout;
 162         int                     x_char;         /* xon/xoff character */
 163         u16                     read_status_mask1;  /* break detection (SR1 indications) */
 164         u16                     read_status_mask2;  /* parity/framing/overun (SR2 indications) */
 165         unsigned char           ignore_status_mask1;  /* break detection (SR1 indications) */
 166         unsigned char           ignore_status_mask2;  /* parity/framing/overun (SR2 indications) */
 167         unsigned char           *tx_buf;
 168         int                     tx_put;
 169         int                     tx_get;
 170         int                     tx_count;
 171
 172         wait_queue_head_t       status_event_wait_q;
 173         wait_queue_head_t       event_wait_q;
 174         struct timer_list       tx_timer;       /* HDLC transmit timeout timer */
 175         struct _synclinkmp_info *next_device;   /* device list link */
 176         struct timer_list       status_timer;   /* input signal status check timer */
 177
 178         spinlock_t lock;                /* spinlock for synchronizing with ISR */
 179         struct work_struct task;                        /* task structure for scheduling bh */
 180
 181         u32 max_frame_size;                     /* as set by device config */
 182
 183         u32 pending_bh;
 184
 185         bool bh_running;                                /* Protection from multiple */
 186         int isr_overflow;
 187         bool bh_requested;
 188
 189         int dcd_chkcount;                       /* check counts to prevent */
 190         int cts_chkcount;                       /* too many IRQs if a signal */
 191         int dsr_chkcount;                       /* is floating */
 192         int ri_chkcount;
 193
 194         char *buffer_list;                      /* virtual address of Rx & Tx buffer lists */
 195         unsigned long buffer_list_phys;
 196
 197         unsigned int rx_buf_count;              /* count of total allocated Rx buffers */
 198         SCADESC *rx_buf_list;                   /* list of receive buffer entries */
 199         SCADESC_EX rx_buf_list_ex[SCAMAXDESC]; /* list of receive buffer entries */
 200         unsigned int current_rx_buf;
 201
 202         unsigned int tx_buf_count;              /* count of total allocated Tx buffers */
 203         SCADESC *tx_buf_list;           /* list of transmit buffer entries */
 204         SCADESC_EX tx_buf_list_ex[SCAMAXDESC]; /* list of transmit buffer entries */
 205         unsigned int last_tx_buf;
 206
 207         unsigned char *tmp_rx_buf;
 208         unsigned int tmp_rx_buf_count;
 209
 210         bool rx_enabled;
 211         bool rx_overflow;
 212
 213         bool tx_enabled;
 214         bool tx_active;
 215         u32 idle_mode;
 216
 217         unsigned char ie0_value;
 218         unsigned char ie1_value;
 219         unsigned char ie2_value;
 220         unsigned char ctrlreg_value;
 221         unsigned char old_signals;
 222
 223         char device_name[25];                   /* device instance name */
 224
 225         int port_count;
 226         int adapter_num;
 227         int port_num;
 228
 229         struct _synclinkmp_info *port_array[SCA_MAX_PORTS];
 230
 231         unsigned int bus_type;                  /* expansion bus type (ISA,EISA,PCI) */
 232
 233         unsigned int irq_level;                 /* interrupt level */
 234         unsigned long irq_flags;
 235         bool irq_requested;                     /* true if IRQ requested */
 236
 237         MGSL_PARAMS params;                     /* communications parameters */
 238
 239         unsigned char serial_signals;           /* current serial signal states */
 240
 241         bool irq_occurred;                      /* for diagnostics use */
 242         unsigned int init_error;                /* Initialization startup error */
 243
 244         u32 last_mem_alloc;
 245         unsigned char* memory_base;             /* shared memory address (PCI only) */
 246         u32 phys_memory_base;
 247         int shared_mem_requested;
 248
 249         unsigned char* sca_base;                /* HD64570 SCA Memory address */
 250         u32 phys_sca_base;
 251         u32 sca_offset;
 252         bool sca_base_requested;
 253
 254         unsigned char* lcr_base;                /* local config registers (PCI only) */
 255         u32 phys_lcr_base;
 256         u32 lcr_offset;
 257         int lcr_mem_requested;
 258
 259         unsigned char* statctrl_base;           /* status/control register memory */
 260         u32 phys_statctrl_base;
 261         u32 statctrl_offset;
 262         bool sca_statctrl_requested;
 263
 264         u32 misc_ctrl_value;
 265         char *flag_buf;
 266         bool drop_rts_on_tx_done;
 267
 268         struct  _input_signal_events    input_signal_events;
 269
 270         /* SPPP/Cisco HDLC device parts */
 271         int netcount;
 272         spinlock_t netlock;
 273
 274 #if SYNCLINK_GENERIC_HDLC
 275         struct net_device *netdev;
 276 #endif
 277
 278 } SLMP_INFO;
 279
 280 #define MGSL_MAGIC 0x5401
 281
 282 /*
 283  * define serial signal status change macros
 284  */
 285 #define MISCSTATUS_DCD_LATCHED  (SerialSignal_DCD<<8)   /* indicates change in DCD */
 286 #define MISCSTATUS_RI_LATCHED   (SerialSignal_RI<<8)    /* indicates change in RI */
 287 #define MISCSTATUS_CTS_LATCHED  (SerialSignal_CTS<<8)   /* indicates change in CTS */
 288 #define MISCSTATUS_DSR_LATCHED  (SerialSignal_DSR<<8)   /* change in DSR */
 289
 290 /* Common Register macros */
 291 #define LPR     0x00
 292 #define PABR0   0x02
 293 #define PABR1   0x03
 294 #define WCRL    0x04
 295 #define WCRM    0x05
 296 #define WCRH    0x06
 297 #define DPCR    0x08
 298 #define DMER    0x09
 299 #define ISR0    0x10
 300 #define ISR1    0x11
 301 #define ISR2    0x12
 302 #define IER0    0x14
 303 #define IER1    0x15
 304 #define IER2    0x16
 305 #define ITCR    0x18
 306 #define INTVR   0x1a
 307 #define IMVR    0x1c
 308
 309 /* MSCI Register macros */
 310 #define TRB     0x20
 311 #define TRBL    0x20
 312 #define TRBH    0x21
 313 #define SR0     0x22
 314 #define SR1     0x23
 315 #define SR2     0x24
 316 #define SR3     0x25
 317 #define FST     0x26
 318 #define IE0     0x28
 319 #define IE1     0x29
 320 #define IE2     0x2a
 321 #define FIE     0x2b
 322 #define CMD     0x2c
 323 #define MD0     0x2e
 324 #define MD1     0x2f
 325 #define MD2     0x30
 326 #define CTL     0x31
 327 #define SA0     0x32
 328 #define SA1     0x33
 329 #define IDL     0x34
 330 #define TMC     0x35
 331 #define RXS     0x36
 332 #define TXS     0x37
 333 #define TRC0    0x38
 334 #define TRC1    0x39
 335 #define RRC     0x3a
 336 #define CST0    0x3c
 337 #define CST1    0x3d
 338
 339 /* Timer Register Macros */
 340 #define TCNT    0x60
 341 #define TCNTL   0x60
 342 #define TCNTH   0x61
 343 #define TCONR   0x62
 344 #define TCONRL  0x62
 345 #define TCONRH  0x63
 346 #define TMCS    0x64
 347 #define TEPR    0x65
 348
 349 /* DMA Controller Register macros */
 350 #define DARL    0x80
 351 #define DARH    0x81
 352 #define DARB    0x82
 353 #define BAR     0x80
 354 #define BARL    0x80
 355 #define BARH    0x81
 356 #define BARB    0x82
 357 #define SAR     0x84
 358 #define SARL    0x84
 359 #define SARH    0x85
 360 #define SARB    0x86
 361 #define CPB     0x86
 362 #define CDA     0x88
 363 #define CDAL    0x88
 364 #define CDAH    0x89
 365 #define EDA     0x8a
 366 #define EDAL    0x8a
 367 #define EDAH    0x8b
 368 #define BFL     0x8c
 369 #define BFLL    0x8c
 370 #define BFLH    0x8d
 371 #define BCR     0x8e
 372 #define BCRL    0x8e
 373 #define BCRH    0x8f
 374 #define DSR     0x90
 375 #define DMR     0x91
 376 #define FCT     0x93
 377 #define DIR     0x94
 378 #define DCMD    0x95
 379
 380 /* combine with timer or DMA register address */
 381 #define TIMER0  0x00
 382 #define TIMER1  0x08
 383 #define TIMER2  0x10
 384 #define TIMER3  0x18
 385 #define RXDMA   0x00
 386 #define TXDMA   0x20
 387
 388 /* SCA Command Codes */
 389 #define NOOP            0x00
 390 #define TXRESET         0x01
 391 #define TXENABLE        0x02
 392 #define TXDISABLE       0x03
 393 #define TXCRCINIT       0x04
 394 #define TXCRCEXCL       0x05
 395 #define TXEOM           0x06
 396 #define TXABORT         0x07
 397 #define MPON            0x08
 398 #define TXBUFCLR        0x09
 399 #define RXRESET         0x11
 400 #define RXENABLE        0x12
 401 #define RXDISABLE       0x13
 402 #define RXCRCINIT       0x14
 403 #define RXREJECT        0x15
 404 #define SEARCHMP        0x16
 405 #define RXCRCEXCL       0x17
 406 #define RXCRCCALC       0x18
 407 #define CHRESET         0x21
 408 #define HUNT            0x31
 409
 410 /* DMA command codes */
 411 #define SWABORT         0x01
 412 #define FEICLEAR        0x02
 413
 414 /* IE0 */
 415 #define TXINTE          BIT7
 416 #define RXINTE          BIT6
 417 #define TXRDYE          BIT1
 418 #define RXRDYE          BIT0
 419
 420 /* IE1 & SR1 */
 421 #define UDRN    BIT7
 422 #define IDLE    BIT6
 423 #define SYNCD   BIT4
 424 #define FLGD    BIT4
 425 #define CCTS    BIT3
 426 #define CDCD    BIT2
 427 #define BRKD    BIT1
 428 #define ABTD    BIT1
 429 #define GAPD    BIT1
 430 #define BRKE    BIT0
 431 #define IDLD    BIT0
 432
 433 /* IE2 & SR2 */
 434 #define EOM     BIT7
 435 #define PMP     BIT6
 436 #define SHRT    BIT6
 437 #define PE      BIT5
 438 #define ABT     BIT5
 439 #define FRME    BIT4
 440 #define RBIT    BIT4
 441 #define OVRN    BIT3
 442 #define CRCE    BIT2
 443
 444
 445 /*
 446  * Global linked list of SyncLink devices
 447  */
 448 static SLMP_INFO *synclinkmp_device_list = NULL;
 449 static int synclinkmp_adapter_count = -1;
 450 static int synclinkmp_device_count = 0;
 451
 452 /*
 453  * Set this param to non-zero to load eax with the
 454  * .text section address and breakpoint on module load.
 455  * This is useful for use with gdb and add-symbol-file command.
 456  */
 457 static bool break_on_load = 0;
 458
 459 /*
 460  * Driver major number, defaults to zero to get auto
 461  * assigned major number. May be forced as module parameter.
 462  */
 463 static int ttymajor = 0;
 464
 465 /*
 466  * Array of user specified options for ISA adapters.
 467  */
 468 static int debug_level = 0;
 469 static int maxframe[MAX_DEVICES] = {0,};
 470
 471 module_param(break_on_load, bool, 0);
 472 module_param(ttymajor, int, 0);
 473 module_param(debug_level, int, 0);
 474 module_param_array(maxframe, int, NULL, 0);
 475
 476 static char *driver_name = "SyncLink MultiPort driver";
 477 static char *driver_version = "$Revision: 4.38 $";
 478
 479 static int synclinkmp_init_one(struct pci_dev *dev,const struct pci_device_id *ent);
 480 static void synclinkmp_remove_one(struct pci_dev *dev);
 481
 482 static struct pci_device_id synclinkmp_pci_tbl[] = {
 483         { PCI_VENDOR_ID_MICROGATE, PCI_DEVICE_ID_MICROGATE_SCA, PCI_ANY_ID, PCI_ANY_ID, },
 484         { 0, }, /* terminate list */
 485 };
 486 MODULE_DEVICE_TABLE(pci, synclinkmp_pci_tbl);
 487
 488 MODULE_LICENSE("GPL");
 489
 490 static struct pci_driver synclinkmp_pci_driver = {
 491         .name           = "synclinkmp",
 492         .id_table       = synclinkmp_pci_tbl,
 493         .probe          = synclinkmp_init_one,
 494         .remove         = synclinkmp_remove_one,
 495 };
 496
 497
 498 static struct tty_driver *serial_driver;
 499
 500 /* number of characters left in xmit buffer before we ask for more */
 501 #define WAKEUP_CHARS 256
 502
 503
 504 /* tty callbacks */
 505
 506 static int  open(struct tty_struct *tty, struct file * filp);
 507 static void close(struct tty_struct *tty, struct file * filp);
 508 static void hangup(struct tty_struct *tty);
 509 static void set_termios(struct tty_struct *tty, struct ktermios *old_termios);
 510
 511 static int  write(struct tty_struct *tty, const unsigned char *buf, int count);
 512 static int put_char(struct tty_struct *tty, unsigned char ch);
 513 static void send_xchar(struct tty_struct *tty, char ch);
 514 static void wait_until_sent(struct tty_struct *tty, int timeout);
 515 static int  write_room(struct tty_struct *tty);
 516 static void flush_chars(struct tty_struct *tty);
 517 static void flush_buffer(struct tty_struct *tty);
 518 static void tx_hold(struct tty_struct *tty);
 519 static void tx_release(struct tty_struct *tty);
 520
 521 static int  ioctl(struct tty_struct *tty, unsigned int cmd, unsigned long arg);
 522 static int  chars_in_buffer(struct tty_struct *tty);
 523 static void throttle(struct tty_struct * tty);
 524 static void unthrottle(struct tty_struct * tty);
 525 static int set_break(struct tty_struct *tty, int break_state);
 526
 527 #if SYNCLINK_GENERIC_HDLC
 528 #define dev_to_port(D) (dev_to_hdlc(D)->priv)
 529 static void hdlcdev_tx_done(SLMP_INFO *info);
 530 static void hdlcdev_rx(SLMP_INFO *info, char *buf, int size);
 531 static int  hdlcdev_init(SLMP_INFO *info);
 532 static void hdlcdev_exit(SLMP_INFO *info);
 533 #endif
 534
 535 /* ioctl handlers */
 536
 537 static int  get_stats(SLMP_INFO *info, struct mgsl_icount __user *user_icount);
 538 static int  get_params(SLMP_INFO *info, MGSL_PARAMS __user *params);
 539 static int  set_params(SLMP_INFO *info, MGSL_PARAMS __user *params);
 540 static int  get_txidle(SLMP_INFO *info, int __user *idle_mode);
 541 static int  set_txidle(SLMP_INFO *info, int idle_mode);
 542 static int  tx_enable(SLMP_INFO *info, int enable);
 543 static int  tx_abort(SLMP_INFO *info);
 544 static int  rx_enable(SLMP_INFO *info, int enable);
 545 static int  modem_input_wait(SLMP_INFO *info,int arg);
 546 static int  wait_mgsl_event(SLMP_INFO *info, int __user *mask_ptr);
 547 static int  tiocmget(struct tty_struct *tty);
 548 static int  tiocmset(struct tty_struct *tty,
 549                         unsigned int set, unsigned int clear);
 550 static int  set_break(struct tty_struct *tty, int break_state);
 551
 552 static int  add_device(SLMP_INFO *info);
 553 static int  device_init(int adapter_num, struct pci_dev *pdev);
 554 static int  claim_resources(SLMP_INFO *info);
 555 static void release_resources(SLMP_INFO *info);
 556
 557 static int  startup(SLMP_INFO *info);
 558 static int  block_til_ready(struct tty_struct *tty, struct file * filp,SLMP_INFO *info);
 559 static int carrier_raised(struct tty_port *port);
 560 static void shutdown(SLMP_INFO *info);
 561 static void program_hw(SLMP_INFO *info);
 562 static void change_params(SLMP_INFO *info);
 563
 564 static bool init_adapter(SLMP_INFO *info);
 565 static bool register_test(SLMP_INFO *info);
 566 static bool irq_test(SLMP_INFO *info);
 567 static bool loopback_test(SLMP_INFO *info);
 568 static int  adapter_test(SLMP_INFO *info);
 569 static bool memory_test(SLMP_INFO *info);
 570
 571 static void reset_adapter(SLMP_INFO *info);
 572 static void reset_port(SLMP_INFO *info);
 573 static void async_mode(SLMP_INFO *info);
 574 static void hdlc_mode(SLMP_INFO *info);
 575
 576 static void rx_stop(SLMP_INFO *info);
 577 static void rx_start(SLMP_INFO *info);
 578 static void rx_reset_buffers(SLMP_INFO *info);
 579 static void rx_free_frame_buffers(SLMP_INFO *info, unsigned int first, unsigned int last);
 580 static bool rx_get_frame(SLMP_INFO *info);
 581
 582 static void tx_start(SLMP_INFO *info);
 583 static void tx_stop(SLMP_INFO *info);
 584 static void tx_load_fifo(SLMP_INFO *info);
 585 static void tx_set_idle(SLMP_INFO *info);
 586 static void tx_load_dma_buffer(SLMP_INFO *info, const char *buf, unsigned int count);
 587
 588 static void get_signals(SLMP_INFO *info);
 589 static void set_signals(SLMP_INFO *info);
 590 static void enable_loopback(SLMP_INFO *info, int enable);
 591 static void set_rate(SLMP_INFO *info, u32 data_rate);
 592
 593 static int  bh_action(SLMP_INFO *info);
 594 static void bh_handler(struct work_struct *work);
 595 static void bh_receive(SLMP_INFO *info);
 596 static void bh_transmit(SLMP_INFO *info);
 597 static void bh_status(SLMP_INFO *info);
 598 static void isr_timer(SLMP_INFO *info);
 599 static void isr_rxint(SLMP_INFO *info);
 600 static void isr_rxrdy(SLMP_INFO *info);
 601 static void isr_txint(SLMP_INFO *info);
 602 static void isr_txrdy(SLMP_INFO *info);
 603 static void isr_rxdmaok(SLMP_INFO *info);
 604 static void isr_rxdmaerror(SLMP_INFO *info);
 605 static void isr_txdmaok(SLMP_INFO *info);
 606 static void isr_txdmaerror(SLMP_INFO *info);
 607 static void isr_io_pin(SLMP_INFO *info, u16 status);
 608
 609 static int  alloc_dma_bufs(SLMP_INFO *info);
 610 static void free_dma_bufs(SLMP_INFO *info);
 611 static int  alloc_buf_list(SLMP_INFO *info);
 612 static int  alloc_frame_bufs(SLMP_INFO *info, SCADESC *list, SCADESC_EX *list_ex,int count);
 613 static int  alloc_tmp_rx_buf(SLMP_INFO *info);
 614 static void free_tmp_rx_buf(SLMP_INFO *info);
 615
 616 static void load_pci_memory(SLMP_INFO *info, char* dest, const char* src, unsigned short count);
 617 static void trace_block(SLMP_INFO *info, const char* data, int count, int xmit);
 618 static void tx_timeout(unsigned long context);
 619 static void status_timeout(unsigned long context);
 620
 621 static unsigned char read_reg(SLMP_INFO *info, unsigned char addr);
 622 static void write_reg(SLMP_INFO *info, unsigned char addr, unsigned char val);
 623 static u16 read_reg16(SLMP_INFO *info, unsigned char addr);
 624 static void write_reg16(SLMP_INFO *info, unsigned char addr, u16 val);
 625 static unsigned char read_status_reg(SLMP_INFO * info);
 626 static void write_control_reg(SLMP_INFO * info);
 627
 628
 629 static unsigned char rx_active_fifo_level = 16; // rx request FIFO activation level in bytes
 630 static unsigned char tx_active_fifo_level = 16; // tx request FIFO activation level in bytes
 631 static unsigned char tx_negate_fifo_level = 32; // tx request FIFO negation level in bytes
 632
 633 static u32 misc_ctrl_value = 0x007e4040;
 634 static u32 lcr1_brdr_value = 0x00800028;
 635
 636 static u32 read_ahead_count = 8;
 637
 638 /* DPCR, DMA Priority Control
 639  *
 640  * 07..05  Not used, must be 0
 641  * 04      BRC, bus release condition: 0=all transfers complete
 642  *              1=release after 1 xfer on all channels
 643  * 03      CCC, channel change condition: 0=every cycle
 644  *              1=after each channel completes all xfers
 645  * 02..00  PR<2..0>, priority 100=round robin
 646  *
 647  * 00000100 = 0x00
 648  */
 649 static unsigned char dma_priority = 0x04;
 650
 651 // Number of bytes that can be written to shared RAM
 652 // in a single write operation
 653 static u32 sca_pci_load_interval = 64;
 654
 655 /*
 656  * 1st function defined in .text section. Calling this function in
 657  * init_module() followed by a breakpoint allows a remote debugger
 658  * (gdb) to get the .text address for the add-symbol-file command.
 659  * This allows remote debugging of dynamically loadable modules.
 660  */
 661 static void* synclinkmp_get_text_ptr(void);
 662 static void* synclinkmp_get_text_ptr(void) {return synclinkmp_get_text_ptr;}
 663
 664 static inline int sanity_check(SLMP_INFO *info,
 665                                char *name, const char *routine)
 666 {
 667 #ifdef SANITY_CHECK
 668         static const char *badmagic =
 669                 "Warning: bad magic number for synclinkmp_struct (%s) in %s\n";
 670         static const char *badinfo =
 671                 "Warning: null synclinkmp_struct for (%s) in %s\n";
 672
 673         if (!info) {
 674                 printk(badinfo, name, routine);
 675                 return 1;
 676         }
 677         if (info->magic != MGSL_MAGIC) {
 678                 printk(badmagic, name, routine);
 679                 return 1;
 680         }
 681 #else
 682         if (!info)
 683                 return 1;
 684 #endif
 685         return 0;
 686 }
 687
 688 /**
 689  * line discipline callback wrappers
 690  *
 691  * The wrappers maintain line discipline references
 692  * while calling into the line discipline.
 693  *
 694  * ldisc_receive_buf  - pass receive data to line discipline
 695  */
 696
 697 static void ldisc_receive_buf(struct tty_struct *tty,
 698                               const __u8 *data, char *flags, int count)
 699 {
 700         struct tty_ldisc *ld;
 701         if (!tty)
 702                 return;
 703         ld = tty_ldisc_ref(tty);
 704         if (ld) {
 705                 if (ld->ops->receive_buf)
 706                         ld->ops->receive_buf(tty, data, flags, count);
 707                 tty_ldisc_deref(ld);
 708         }
 709 }
 710
 711 /* tty callbacks */
 712
 713 static int install(struct tty_driver *driver, struct tty_struct *tty)
 714 {
 715         SLMP_INFO *info;
 716         int line = tty->index;
 717
 718         if (line >= synclinkmp_device_count) {
 719                 printk("%s(%d): open with invalid line #%d.\n",
 720                         __FILE__,__LINE__,line);
 721                 return -ENODEV;
 722         }
 723
 724         info = synclinkmp_device_list;
 725         while (info && info->line != line)
 726                 info = info->next_device;
 727         if (sanity_check(info, tty->name, "open"))
 728                 return -ENODEV;
 729         if (info->init_error) {
 730                 printk("%s(%d):%s device is not allocated, init error=%d\n",
 731                         __FILE__, __LINE__, info->device_name,
 732                         info->init_error);
 733                 return -ENODEV;
 734         }
 735
 736         tty->driver_data = info;
 737
 738         return tty_port_install(&info->port, driver, tty);
 739 }
 740
 741 /* Called when a port is opened.  Init and enable port.
 742  */
 743 static int open(struct tty_struct *tty, struct file *filp)
 744 {
 745         SLMP_INFO *info = tty->driver_data;
 746         unsigned long flags;
 747         int retval;
 748
 749         info->port.tty = tty;
 750
 751         if (debug_level >= DEBUG_LEVEL_INFO)
 752                 printk("%s(%d):%s open(), old ref count = %d\n",
 753                          __FILE__,__LINE__,tty->driver->name, info->port.count);
 754
 755         info->port.low_latency = (info->port.flags & ASYNC_LOW_LATENCY) ? 1 : 0;
 756
 757         spin_lock_irqsave(&info->netlock, flags);
 758         if (info->netcount) {
 759                 retval = -EBUSY;
 760                 spin_unlock_irqrestore(&info->netlock, flags);
 761                 goto cleanup;
 762         }
 763         info->port.count++;
 764         spin_unlock_irqrestore(&info->netlock, flags);
 765
 766         if (info->port.count == 1) {
 767                 /* 1st open on this device, init hardware */
 768                 retval = startup(info);
 769                 if (retval < 0)
 770                         goto cleanup;
 771         }
 772
 773         retval = block_til_ready(tty, filp, info);
 774         if (retval) {
 775                 if (debug_level >= DEBUG_LEVEL_INFO)
 776                         printk("%s(%d):%s block_til_ready() returned %d\n",
 777                                  __FILE__,__LINE__, info->device_name, retval);
 778                 goto cleanup;
 779         }
 780
 781         if (debug_level >= DEBUG_LEVEL_INFO)
 782                 printk("%s(%d):%s open() success\n",
 783                          __FILE__,__LINE__, info->device_name);
 784         retval = 0;
 785
 786 cleanup:
 787         if (retval) {
 788                 if (tty->count == 1)
 789                         info->port.tty = NULL; /* tty layer will release tty struct */
 790                 if(info->port.count)
 791                         info->port.count--;
 792         }
 793
 794         return retval;
 795 }
 796
 797 /* Called when port is closed. Wait for remaining data to be
 798  * sent. Disable port and free resources.
 799  */
 800 static void close(struct tty_struct *tty, struct file *filp)
 801 {
 802         SLMP_INFO * info = tty->driver_data;
 803
 804         if (sanity_check(info, tty->name, "close"))
 805                 return;
 806
 807         if (debug_level >= DEBUG_LEVEL_INFO)
 808                 printk("%s(%d):%s close() entry, count=%d\n",
 809                          __FILE__,__LINE__, info->device_name, info->port.count);
 810
 811         if (tty_port_close_start(&info->port, tty, filp) == 0)
 812                 goto cleanup;
 813
 814         mutex_lock(&info->port.mutex);
 815         if (tty_port_initialized(&info->port))
 816                 wait_until_sent(tty, info->timeout);
 817
 818         flush_buffer(tty);
 819         tty_ldisc_flush(tty);
 820         shutdown(info);
 821         mutex_unlock(&info->port.mutex);
 822
 823         tty_port_close_end(&info->port, tty);
 824         info->port.tty = NULL;
 825 cleanup:
 826         if (debug_level >= DEBUG_LEVEL_INFO)
 827                 printk("%s(%d):%s close() exit, count=%d\n", __FILE__,__LINE__,
 828                         tty->driver->name, info->port.count);
 829 }
 830
 831 /* Called by tty_hangup() when a hangup is signaled.
 832  * This is the same as closing all open descriptors for the port.
 833  */
 834 static void hangup(struct tty_struct *tty)
 835 {
 836         SLMP_INFO *info = tty->driver_data;
 837         unsigned long flags;
 838
 839         if (debug_level >= DEBUG_LEVEL_INFO)
 840                 printk("%s(%d):%s hangup()\n",
 841                          __FILE__,__LINE__, info->device_name );
 842
 843         if (sanity_check(info, tty->name, "hangup"))
 844                 return;
 845
 846         mutex_lock(&info->port.mutex);
 847         flush_buffer(tty);
 848         shutdown(info);
 849
 850         spin_lock_irqsave(&info->port.lock, flags);
 851         info->port.count = 0;
 852         info->port.tty = NULL;
 853         spin_unlock_irqrestore(&info->port.lock, flags);
 854         tty_port_set_active(&info->port, 1);
 855         mutex_unlock(&info->port.mutex);
 856
 857         wake_up_interruptible(&info->port.open_wait);
 858 }
 859
 860 /* Set new termios settings
 861  */
 862 static void set_termios(struct tty_struct *tty, struct ktermios *old_termios)
 863 {
 864         SLMP_INFO *info = tty->driver_data;
 865         unsigned long flags;
 866
 867         if (debug_level >= DEBUG_LEVEL_INFO)
 868                 printk("%s(%d):%s set_termios()\n", __FILE__,__LINE__,
 869                         tty->driver->name );
 870
 871         change_params(info);
 872
 873         /* Handle transition to B0 status */
 874         if ((old_termios->c_cflag & CBAUD) && !C_BAUD(tty)) {
 875                 info->serial_signals &= ~(SerialSignal_RTS | SerialSignal_DTR);
 876                 spin_lock_irqsave(&info->lock,flags);
 877                 set_signals(info);
 878                 spin_unlock_irqrestore(&info->lock,flags);
 879         }
 880
 881         /* Handle transition away from B0 status */
 882         if (!(old_termios->c_cflag & CBAUD) && C_BAUD(tty)) {
 883                 info->serial_signals |= SerialSignal_DTR;
 884                 if (!C_CRTSCTS(tty) || !tty_throttled(tty))
 885                         info->serial_signals |= SerialSignal_RTS;
 886                 spin_lock_irqsave(&info->lock,flags);
 887                 set_signals(info);
 888                 spin_unlock_irqrestore(&info->lock,flags);
 889         }
 890
 891         /* Handle turning off CRTSCTS */
 892         if (old_termios->c_cflag & CRTSCTS && !C_CRTSCTS(tty)) {
 893                 tty->hw_stopped = 0;
 894                 tx_release(tty);
 895         }
 896 }
 897
 898 /* Send a block of data
 899  *
 900  * Arguments:
 901  *
 902  *      tty             pointer to tty information structure
 903  *      buf             pointer to buffer containing send data
 904  *      count           size of send data in bytes
 905  *
 906  * Return Value:        number of characters written
 907  */
 908 static int write(struct tty_struct *tty,
 909                  const unsigned char *buf, int count)
 910 {
 911         int     c, ret = 0;
 912         SLMP_INFO *info = tty->driver_data;
 913         unsigned long flags;
 914
 915         if (debug_level >= DEBUG_LEVEL_INFO)
 916                 printk("%s(%d):%s write() count=%d\n",
 917                        __FILE__,__LINE__,info->device_name,count);
 918
 919         if (sanity_check(info, tty->name, "write"))
 920                 goto cleanup;
 921
 922         if (!info->tx_buf)
 923                 goto cleanup;
 924
 925         if (info->params.mode == MGSL_MODE_HDLC) {
 926                 if (count > info->max_frame_size) {
 927                         ret = -EIO;
 928                         goto cleanup;
 929                 }
 930                 if (info->tx_active)
 931                         goto cleanup;
 932                 if (info->tx_count) {
 933                         /* send accumulated data from send_char() calls */
 934                         /* as frame and wait before accepting more data. */
 935                         tx_load_dma_buffer(info, info->tx_buf, info->tx_count);
 936                         goto start;
 937                 }
 938                 ret = info->tx_count = count;
 939                 tx_load_dma_buffer(info, buf, count);
 940                 goto start;
 941         }
 942
 943         for (;;) {
 944                 c = min_t(int, count,
 945                         min(info->max_frame_size - info->tx_count - 1,
 946                             info->max_frame_size - info->tx_put));
 947                 if (c <= 0)
 948                         break;
 949
 950                 memcpy(info->tx_buf + info->tx_put, buf, c);
 951
 952                 spin_lock_irqsave(&info->lock,flags);
 953                 info->tx_put += c;
 954                 if (info->tx_put >= info->max_frame_size)
 955                         info->tx_put -= info->max_frame_size;
 956                 info->tx_count += c;
 957                 spin_unlock_irqrestore(&info->lock,flags);
 958
 959                 buf += c;
 960                 count -= c;
 961                 ret += c;
 962         }
 963
 964         if (info->params.mode == MGSL_MODE_HDLC) {
 965                 if (count) {
 966                         ret = info->tx_count = 0;
 967                         goto cleanup;
 968                 }
 969                 tx_load_dma_buffer(info, info->tx_buf, info->tx_count);
 970         }
 971 start:
 972         if (info->tx_count && !tty->stopped && !tty->hw_stopped) {
 973                 spin_lock_irqsave(&info->lock,flags);
 974                 if (!info->tx_active)
 975                         tx_start(info);
 976                 spin_unlock_irqrestore(&info->lock,flags);
 977         }
 978
 979 cleanup:
 980         if (debug_level >= DEBUG_LEVEL_INFO)
 981                 printk( "%s(%d):%s write() returning=%d\n",
 982                         __FILE__,__LINE__,info->device_name,ret);
 983         return ret;
 984 }
 985
 986 /* Add a character to the transmit buffer.
 987  */
 988 static int put_char(struct tty_struct *tty, unsigned char ch)
 989 {
 990         SLMP_INFO *info = tty->driver_data;
 991         unsigned long flags;
 992         int ret = 0;
 993
 994         if ( debug_level >= DEBUG_LEVEL_INFO ) {
 995                 printk( "%s(%d):%s put_char(%d)\n",
 996                         __FILE__,__LINE__,info->device_name,ch);
 997         }
 998
 999         if (sanity_check(info, tty->name, "put_char"))
1000                 return 0;
1001
1002         if (!info->tx_buf)
1003                 return 0;
1004
1005         spin_lock_irqsave(&info->lock,flags);
1006
1007         if ( (info->params.mode != MGSL_MODE_HDLC) ||
1008              !info->tx_active ) {
1009
1010                 if (info->tx_count < info->max_frame_size - 1) {
1011                         info->tx_buf[info->tx_put++] = ch;
1012                         if (info->tx_put >= info->max_frame_size)
1013                                 info->tx_put -= info->max_frame_size;
1014                         info->tx_count++;
1015                         ret = 1;
1016                 }
1017         }
1018
1019         spin_unlock_irqrestore(&info->lock,flags);
1020         return ret;
1021 }
1022
1023 /* Send a high-priority XON/XOFF character
1024  */
1025 static void send_xchar(struct tty_struct *tty, char ch)
1026 {
1027         SLMP_INFO *info = tty->driver_data;
1028         unsigned long flags;
1029
1030         if (debug_level >= DEBUG_LEVEL_INFO)
1031                 printk("%s(%d):%s send_xchar(%d)\n",
1032                          __FILE__,__LINE__, info->device_name, ch );
1033
1034         if (sanity_check(info, tty->name, "send_xchar"))
1035                 return;
1036
1037         info->x_char = ch;
1038         if (ch) {
1039                 /* Make sure transmit interrupts are on */
1040                 spin_lock_irqsave(&info->lock,flags);
1041                 if (!info->tx_enabled)
1042                         tx_start(info);
1043                 spin_unlock_irqrestore(&info->lock,flags);
1044         }
1045 }
1046
1047 /* Wait until the transmitter is empty.
1048  */
1049 static void wait_until_sent(struct tty_struct *tty, int timeout)
1050 {
1051         SLMP_INFO * info = tty->driver_data;
1052         unsigned long orig_jiffies, char_time;
1053
1054         if (!info )
1055                 return;
1056
1057         if (debug_level >= DEBUG_LEVEL_INFO)
1058                 printk("%s(%d):%s wait_until_sent() entry\n",
1059                          __FILE__,__LINE__, info->device_name );
1060
1061         if (sanity_check(info, tty->name, "wait_until_sent"))
1062                 return;
1063
1064         if (!tty_port_initialized(&info->port))
1065                 goto exit;
1066
1067         orig_jiffies = jiffies;
1068
1069         /* Set check interval to 1/5 of estimated time to
1070          * send a character, and make it at least 1. The check
1071          * interval should also be less than the timeout.
1072          * Note: use tight timings here to satisfy the NIST-PCTS.
1073          */
1074
1075         if ( info->params.data_rate ) {
1076                 char_time = info->timeout/(32 * 5);
1077                 if (!char_time)
1078                         char_time++;
1079         } else
1080                 char_time = 1;
1081
1082         if (timeout)
1083                 char_time = min_t(unsigned long, char_time, timeout);
1084
1085         if ( info->params.mode == MGSL_MODE_HDLC ) {
1086                 while (info->tx_active) {
1087                         msleep_interruptible(jiffies_to_msecs(char_time));
1088                         if (signal_pending(current))
1089                                 break;
1090                         if (timeout && time_after(jiffies, orig_jiffies + timeout))
1091                                 break;
1092                 }
1093         } else {
1094                 /*
1095                  * TODO: determine if there is something similar to USC16C32
1096                  *       TXSTATUS_ALL_SENT status
1097                  */
1098                 while ( info->tx_active && info->tx_enabled) {
1099                         msleep_interruptible(jiffies_to_msecs(char_time));
1100                         if (signal_pending(current))
1101                                 break;
1102                         if (timeout && time_after(jiffies, orig_jiffies + timeout))
1103                                 break;
1104                 }
1105         }
1106
1107 exit:
1108         if (debug_level >= DEBUG_LEVEL_INFO)
1109                 printk("%s(%d):%s wait_until_sent() exit\n",
1110                          __FILE__,__LINE__, info->device_name );
1111 }
1112
1113 /* Return the count of free bytes in transmit buffer
1114  */
1115 static int write_room(struct tty_struct *tty)
1116 {
1117         SLMP_INFO *info = tty->driver_data;
1118         int ret;
1119
1120         if (sanity_check(info, tty->name, "write_room"))
1121                 return 0;
1122
1123         if (info->params.mode == MGSL_MODE_HDLC) {
1124                 ret = (info->tx_active) ? 0 : HDLC_MAX_FRAME_SIZE;
1125         } else {
1126                 ret = info->max_frame_size - info->tx_count - 1;
1127                 if (ret < 0)
1128                         ret = 0;
1129         }
1130
1131         if (debug_level >= DEBUG_LEVEL_INFO)
1132                 printk("%s(%d):%s write_room()=%d\n",
1133                        __FILE__, __LINE__, info->device_name, ret);
1134
1135         return ret;
1136 }
1137
1138 /* enable transmitter and send remaining buffered characters
1139  */
1140 static void flush_chars(struct tty_struct *tty)
1141 {
1142         SLMP_INFO *info = tty->driver_data;
1143         unsigned long flags;
1144
1145         if ( debug_level >= DEBUG_LEVEL_INFO )
1146                 printk( "%s(%d):%s flush_chars() entry tx_count=%d\n",
1147                         __FILE__,__LINE__,info->device_name,info->tx_count);
1148
1149         if (sanity_check(info, tty->name, "flush_chars"))
1150                 return;
1151
1152         if (info->tx_count <= 0 || tty->stopped || tty->hw_stopped ||
1153             !info->tx_buf)
1154                 return;
1155
1156         if ( debug_level >= DEBUG_LEVEL_INFO )
1157                 printk( "%s(%d):%s flush_chars() entry, starting transmitter\n",
1158                         __FILE__,__LINE__,info->device_name );
1159
1160         spin_lock_irqsave(&info->lock,flags);
1161
1162         if (!info->tx_active) {
1163                 if ( (info->params.mode == MGSL_MODE_HDLC) &&
1164                         info->tx_count ) {
1165                         /* operating in synchronous (frame oriented) mode */
1166                         /* copy data from circular tx_buf to */
1167                         /* transmit DMA buffer. */
1168                         tx_load_dma_buffer(info,
1169                                  info->tx_buf,info->tx_count);
1170                 }
1171                 tx_start(info);
1172         }
1173
1174         spin_unlock_irqrestore(&info->lock,flags);
1175 }
1176
1177 /* Discard all data in the send buffer
1178  */
1179 static void flush_buffer(struct tty_struct *tty)
1180 {
1181         SLMP_INFO *info = tty->driver_data;
1182         unsigned long flags;
1183
1184         if (debug_level >= DEBUG_LEVEL_INFO)
1185                 printk("%s(%d):%s flush_buffer() entry\n",
1186                          __FILE__,__LINE__, info->device_name );
1187
1188         if (sanity_check(info, tty->name, "flush_buffer"))
1189                 return;
1190
1191         spin_lock_irqsave(&info->lock,flags);
1192         info->tx_count = info->tx_put = info->tx_get = 0;
1193         del_timer(&info->tx_timer);
1194         spin_unlock_irqrestore(&info->lock,flags);
1195
1196         tty_wakeup(tty);
1197 }
1198
1199 /* throttle (stop) transmitter
1200  */
1201 static void tx_hold(struct tty_struct *tty)
1202 {
1203         SLMP_INFO *info = tty->driver_data;
1204         unsigned long flags;
1205
1206         if (sanity_check(info, tty->name, "tx_hold"))
1207                 return;
1208
1209         if ( debug_level >= DEBUG_LEVEL_INFO )
1210                 printk("%s(%d):%s tx_hold()\n",
1211                         __FILE__,__LINE__,info->device_name);
1212
1213         spin_lock_irqsave(&info->lock,flags);
1214         if (info->tx_enabled)
1215                 tx_stop(info);
1216         spin_unlock_irqrestore(&info->lock,flags);
1217 }
1218
1219 /* release (start) transmitter
1220  */
1221 static void tx_release(struct tty_struct *tty)
1222 {
1223         SLMP_INFO *info = tty->driver_data;
1224         unsigned long flags;
1225
1226         if (sanity_check(info, tty->name, "tx_release"))
1227                 return;
1228
1229         if ( debug_level >= DEBUG_LEVEL_INFO )
1230                 printk("%s(%d):%s tx_release()\n",
1231                         __FILE__,__LINE__,info->device_name);
1232
1233         spin_lock_irqsave(&info->lock,flags);
1234         if (!info->tx_enabled)
1235                 tx_start(info);
1236         spin_unlock_irqrestore(&info->lock,flags);
1237 }
1238
1239 /* Service an IOCTL request
1240  *
1241  * Arguments:
1242  *
1243  *      tty     pointer to tty instance data
1244  *      cmd     IOCTL command code
1245  *      arg     command argument/context
1246  *
1247  * Return Value:        0 if success, otherwise error code
1248  */
1249 static int ioctl(struct tty_struct *tty,
1250                  unsigned int cmd, unsigned long arg)
1251 {
1252         SLMP_INFO *info = tty->driver_data;
1253         void __user *argp = (void __user *)arg;
1254
1255         if (debug_level >= DEBUG_LEVEL_INFO)
1256                 printk("%s(%d):%s ioctl() cmd=%08X\n", __FILE__,__LINE__,
1257                         info->device_name, cmd );
1258
1259         if (sanity_check(info, tty->name, "ioctl"))
1260                 return -ENODEV;
1261
1262         if ((cmd != TIOCGSERIAL) && (cmd != TIOCSSERIAL) &&
1263             (cmd != TIOCMIWAIT)) {
1264                 if (tty_io_error(tty))
1265                     return -EIO;
1266         }
1267
1268         switch (cmd) {
1269         case MGSL_IOCGPARAMS:
1270                 return get_params(info, argp);
1271         case MGSL_IOCSPARAMS:
1272                 return set_params(info, argp);
1273         case MGSL_IOCGTXIDLE:
1274                 return get_txidle(info, argp);
1275         case MGSL_IOCSTXIDLE:
1276                 return set_txidle(info, (int)arg);
1277         case MGSL_IOCTXENABLE:
1278                 return tx_enable(info, (int)arg);
1279         case MGSL_IOCRXENABLE:
1280                 return rx_enable(info, (int)arg);
1281         case MGSL_IOCTXABORT:
1282                 return tx_abort(info);
1283         case MGSL_IOCGSTATS:
1284                 return get_stats(info, argp);
1285         case MGSL_IOCWAITEVENT:
1286                 return wait_mgsl_event(info, argp);
1287         case MGSL_IOCLOOPTXDONE:
1288                 return 0; // TODO: Not supported, need to document
1289                 /* Wait for modem input (DCD,RI,DSR,CTS) change
1290                  * as specified by mask in arg (TIOCM_RNG/DSR/CD/CTS)
1291                  */
1292         case TIOCMIWAIT:
1293                 return modem_input_wait(info,(int)arg);
1294
1295                 /*
1296                  * Get counter of input serial line interrupts (DCD,RI,DSR,CTS)
1297                  * Return: write counters to the user passed counter struct
1298                  * NB: both 1->0 and 0->1 transitions are counted except for
1299                  *     RI where only 0->1 is counted.
1300                  */
1301         default:
1302                 return -ENOIOCTLCMD;
1303         }
1304         return 0;
1305 }
1306
1307 static int get_icount(struct tty_struct *tty,
1308                                 struct serial_icounter_struct *icount)
1309 {
1310         SLMP_INFO *info = tty->driver_data;
1311         struct mgsl_icount cnow;        /* kernel counter temps */
1312         unsigned long flags;
1313
1314         spin_lock_irqsave(&info->lock,flags);
1315         cnow = info->icount;
1316         spin_unlock_irqrestore(&info->lock,flags);
1317
1318         icount->cts = cnow.cts;
1319         icount->dsr = cnow.dsr;
1320         icount->rng = cnow.rng;
1321         icount->dcd = cnow.dcd;
1322         icount->rx = cnow.rx;
1323         icount->tx = cnow.tx;
1324         icount->frame = cnow.frame;
1325         icount->overrun = cnow.overrun;
1326         icount->parity = cnow.parity;
1327         icount->brk = cnow.brk;
1328         icount->buf_overrun = cnow.buf_overrun;
1329
1330         return 0;
1331 }
1332
1333 /*
1334  * /proc fs routines....
1335  */
1336
1337 static inline void line_info(struct seq_file *m, SLMP_INFO *info)
1338 {
1339         char    stat_buf[30];
1340         unsigned long flags;
1341
1342         seq_printf(m, "%s: SCABase=%08x Mem=%08X StatusControl=%08x LCR=%08X\n"
1343                        "\tIRQ=%d MaxFrameSize=%u\n",
1344                 info->device_name,
1345                 info->phys_sca_base,
1346                 info->phys_memory_base,
1347                 info->phys_statctrl_base,
1348                 info->phys_lcr_base,
1349                 info->irq_level,
1350                 info->max_frame_size );
1351
1352         /* output current serial signal states */
1353         spin_lock_irqsave(&info->lock,flags);
1354         get_signals(info);
1355         spin_unlock_irqrestore(&info->lock,flags);
1356
1357         stat_buf[0] = 0;
1358         stat_buf[1] = 0;
1359         if (info->serial_signals & SerialSignal_RTS)
1360                 strcat(stat_buf, "|RTS");
1361         if (info->serial_signals & SerialSignal_CTS)
1362                 strcat(stat_buf, "|CTS");
1363         if (info->serial_signals & SerialSignal_DTR)
1364                 strcat(stat_buf, "|DTR");
1365         if (info->serial_signals & SerialSignal_DSR)
1366                 strcat(stat_buf, "|DSR");
1367         if (info->serial_signals & SerialSignal_DCD)
1368                 strcat(stat_buf, "|CD");
1369         if (info->serial_signals & SerialSignal_RI)
1370                 strcat(stat_buf, "|RI");
1371
1372         if (info->params.mode == MGSL_MODE_HDLC) {
1373                 seq_printf(m, "\tHDLC txok:%d rxok:%d",
1374                               info->icount.txok, info->icount.rxok);
1375                 if (info->icount.txunder)
1376                         seq_printf(m, " txunder:%d", info->icount.txunder);
1377                 if (info->icount.txabort)
1378                         seq_printf(m, " txabort:%d", info->icount.txabort);
1379                 if (info->icount.rxshort)
1380                         seq_printf(m, " rxshort:%d", info->icount.rxshort);
1381                 if (info->icount.rxlong)
1382                         seq_printf(m, " rxlong:%d", info->icount.rxlong);
1383                 if (info->icount.rxover)
1384                         seq_printf(m, " rxover:%d", info->icount.rxover);
1385                 if (info->icount.rxcrc)
1386                         seq_printf(m, " rxlong:%d", info->icount.rxcrc);
1387         } else {
1388                 seq_printf(m, "\tASYNC tx:%d rx:%d",
1389                               info->icount.tx, info->icount.rx);
1390                 if (info->icount.frame)
1391                         seq_printf(m, " fe:%d", info->icount.frame);
1392                 if (info->icount.parity)
1393                         seq_printf(m, " pe:%d", info->icount.parity);
1394                 if (info->icount.brk)
1395                         seq_printf(m, " brk:%d", info->icount.brk);
1396                 if (info->icount.overrun)
1397                         seq_printf(m, " oe:%d", info->icount.overrun);
1398         }
1399
1400         /* Append serial signal status to end */
1401         seq_printf(m, " %s\n", stat_buf+1);
1402
1403         seq_printf(m, "\ttxactive=%d bh_req=%d bh_run=%d pending_bh=%x\n",
1404          info->tx_active,info->bh_requested,info->bh_running,
1405          info->pending_bh);
1406 }
1407
1408 /* Called to print information about devices
1409  */
1410 static int synclinkmp_proc_show(struct seq_file *m, void *v)
1411 {
1412         SLMP_INFO *info;
1413
1414         seq_printf(m, "synclinkmp driver:%s\n", driver_version);
1415
1416         info = synclinkmp_device_list;
1417         while( info ) {
1418                 line_info(m, info);
1419                 info = info->next_device;
1420         }
1421         return 0;
1422 }
1423
1424 static int synclinkmp_proc_open(struct inode *inode, struct file *file)
1425 {
1426         return single_open(file, synclinkmp_proc_show, NULL);
1427 }
1428
1429 static const struct file_operations synclinkmp_proc_fops = {
1430         .owner          = THIS_MODULE,
1431         .open           = synclinkmp_proc_open,
1432         .read           = seq_read,
1433         .llseek         = seq_lseek,
1434         .release        = single_release,
1435 };
1436
1437 /* Return the count of bytes in transmit buffer
1438  */
1439 static int chars_in_buffer(struct tty_struct *tty)
1440 {
1441         SLMP_INFO *info = tty->driver_data;
1442
1443         if (sanity_check(info, tty->name, "chars_in_buffer"))
1444                 return 0;
1445
1446         if (debug_level >= DEBUG_LEVEL_INFO)
1447                 printk("%s(%d):%s chars_in_buffer()=%d\n",
1448                        __FILE__, __LINE__, info->device_name, info->tx_count);
1449
1450         return info->tx_count;
1451 }
1452
1453 /* Signal remote device to throttle send data (our receive data)
1454  */
1455 static void throttle(struct tty_struct * tty)
1456 {
1457         SLMP_INFO *info = tty->driver_data;
1458         unsigned long flags;
1459
1460         if (debug_level >= DEBUG_LEVEL_INFO)
1461                 printk("%s(%d):%s throttle() entry\n",
1462                          __FILE__,__LINE__, info->device_name );
1463
1464         if (sanity_check(info, tty->name, "throttle"))
1465                 return;
1466
1467         if (I_IXOFF(tty))
1468                 send_xchar(tty, STOP_CHAR(tty));
1469
1470         if (C_CRTSCTS(tty)) {
1471                 spin_lock_irqsave(&info->lock,flags);
1472                 info->serial_signals &= ~SerialSignal_RTS;
1473                 set_signals(info);
1474                 spin_unlock_irqrestore(&info->lock,flags);
1475         }
1476 }
1477
1478 /* Signal remote device to stop throttling send data (our receive data)
1479  */
1480 static void unthrottle(struct tty_struct * tty)
1481 {
1482         SLMP_INFO *info = tty->driver_data;
1483         unsigned long flags;
1484
1485         if (debug_level >= DEBUG_LEVEL_INFO)
1486                 printk("%s(%d):%s unthrottle() entry\n",
1487                          __FILE__,__LINE__, info->device_name );
1488
1489         if (sanity_check(info, tty->name, "unthrottle"))
1490                 return;
1491
1492         if (I_IXOFF(tty)) {
1493                 if (info->x_char)
1494                         info->x_char = 0;
1495                 else
1496                         send_xchar(tty, START_CHAR(tty));
1497         }
1498
1499         if (C_CRTSCTS(tty)) {
1500                 spin_lock_irqsave(&info->lock,flags);
1501                 info->serial_signals |= SerialSignal_RTS;
1502                 set_signals(info);
1503                 spin_unlock_irqrestore(&info->lock,flags);
1504         }
1505 }
1506
1507 /* set or clear transmit break condition
1508  * break_state  -1=set break condition, 0=clear
1509  */
1510 static int set_break(struct tty_struct *tty, int break_state)
1511 {
1512         unsigned char RegValue;
1513         SLMP_INFO * info = tty->driver_data;
1514         unsigned long flags;
1515
1516         if (debug_level >= DEBUG_LEVEL_INFO)
1517                 printk("%s(%d):%s set_break(%d)\n",
1518                          __FILE__,__LINE__, info->device_name, break_state);
1519
1520         if (sanity_check(info, tty->name, "set_break"))
1521                 return -EINVAL;
1522
1523         spin_lock_irqsave(&info->lock,flags);
1524         RegValue = read_reg(info, CTL);
1525         if (break_state == -1)
1526                 RegValue |= BIT3;
1527         else
1528                 RegValue &= ~BIT3;
1529         write_reg(info, CTL, RegValue);
1530         spin_unlock_irqrestore(&info->lock,flags);
1531         return 0;
1532 }
1533
1534 #if SYNCLINK_GENERIC_HDLC
1535
1536 /**
1537  * called by generic HDLC layer when protocol selected (PPP, frame relay, etc.)
1538  * set encoding and frame check sequence (FCS) options
1539  *
1540  * dev       pointer to network device structure
1541  * encoding  serial encoding setting
1542  * parity    FCS setting
1543  *
1544  * returns 0 if success, otherwise error code
1545  */
1546 static int hdlcdev_attach(struct net_device *dev, unsigned short encoding,
1547                           unsigned short parity)
1548 {
1549         SLMP_INFO *info = dev_to_port(dev);
1550         unsigned char  new_encoding;
1551         unsigned short new_crctype;
1552
1553         /* return error if TTY interface open */
1554         if (info->port.count)
1555                 return -EBUSY;
1556
1557         switch (encoding)
1558         {
1559         case ENCODING_NRZ:        new_encoding = HDLC_ENCODING_NRZ; break;
1560         case ENCODING_NRZI:       new_encoding = HDLC_ENCODING_NRZI_SPACE; break;
1561         case ENCODING_FM_MARK:    new_encoding = HDLC_ENCODING_BIPHASE_MARK; break;
1562         case ENCODING_FM_SPACE:   new_encoding = HDLC_ENCODING_BIPHASE_SPACE; break;
1563         case ENCODING_MANCHESTER: new_encoding = HDLC_ENCODING_BIPHASE_LEVEL; break;
1564         default: return -EINVAL;
1565         }
1566
1567         switch (parity)
1568         {
1569         case PARITY_NONE:            new_crctype = HDLC_CRC_NONE; break;
1570         case PARITY_CRC16_PR1_CCITT: new_crctype = HDLC_CRC_16_CCITT; break;
1571         case PARITY_CRC32_PR1_CCITT: new_crctype = HDLC_CRC_32_CCITT; break;
1572         default: return -EINVAL;
1573         }
1574
1575         info->params.encoding = new_encoding;
1576         info->params.crc_type = new_crctype;
1577
1578         /* if network interface up, reprogram hardware */
1579         if (info->netcount)
1580                 program_hw(info);
1581
1582         return 0;
1583 }
1584
1585 /**
1586  * called by generic HDLC layer to send frame
1587  *
1588  * skb  socket buffer containing HDLC frame
1589  * dev  pointer to network device structure
1590  */
1591 static netdev_tx_t hdlcdev_xmit(struct sk_buff *skb,
1592                                       struct net_device *dev)
1593 {
1594         SLMP_INFO *info = dev_to_port(dev);
1595         unsigned long flags;
1596
1597         if (debug_level >= DEBUG_LEVEL_INFO)
1598                 printk(KERN_INFO "%s:hdlc_xmit(%s)\n",__FILE__,dev->name);
1599
1600         /* stop sending until this frame completes */
1601         netif_stop_queue(dev);
1602
1603         /* copy data to device buffers */
1604         info->tx_count = skb->len;
1605         tx_load_dma_buffer(info, skb->data, skb->len);
1606
1607         /* update network statistics */
1608         dev->stats.tx_packets++;
1609         dev->stats.tx_bytes += skb->len;
1610
1611         /* done with socket buffer, so free it */
1612         dev_kfree_skb(skb);
1613
1614         /* save start time for transmit timeout detection */
1615         netif_trans_update(dev);
1616
1617         /* start hardware transmitter if necessary */
1618         spin_lock_irqsave(&info->lock,flags);
1619         if (!info->tx_active)
1620                 tx_start(info);
1621         spin_unlock_irqrestore(&info->lock,flags);
1622
1623         return NETDEV_TX_OK;
1624 }
1625
1626 /**
1627  * called by network layer when interface enabled
1628  * claim resources and initialize hardware
1629  *
1630  * dev  pointer to network device structure
1631  *
1632  * returns 0 if success, otherwise error code
1633  */
1634 static int hdlcdev_open(struct net_device *dev)
1635 {
1636         SLMP_INFO *info = dev_to_port(dev);
1637         int rc;
1638         unsigned long flags;
1639
1640         if (debug_level >= DEBUG_LEVEL_INFO)
1641                 printk("%s:hdlcdev_open(%s)\n",__FILE__,dev->name);
1642
1643         /* generic HDLC layer open processing */
1644         rc = hdlc_open(dev);
1645         if (rc)
1646                 return rc;
1647
1648         /* arbitrate between network and tty opens */
1649         spin_lock_irqsave(&info->netlock, flags);
1650         if (info->port.count != 0 || info->netcount != 0) {
1651                 printk(KERN_WARNING "%s: hdlc_open returning busy\n", dev->name);
1652                 spin_unlock_irqrestore(&info->netlock, flags);
1653                 return -EBUSY;
1654         }
1655         info->netcount=1;
1656         spin_unlock_irqrestore(&info->netlock, flags);
1657
1658         /* claim resources and init adapter */
1659         if ((rc = startup(info)) != 0) {
1660                 spin_lock_irqsave(&info->netlock, flags);
1661                 info->netcount=0;
1662                 spin_unlock_irqrestore(&info->netlock, flags);
1663                 return rc;
1664         }
1665
1666         /* assert RTS and DTR, apply hardware settings */
1667         info->serial_signals |= SerialSignal_RTS | SerialSignal_DTR;
1668         program_hw(info);
1669
1670         /* enable network layer transmit */
1671         netif_trans_update(dev);
1672         netif_start_queue(dev);
1673
1674         /* inform generic HDLC layer of current DCD status */
1675         spin_lock_irqsave(&info->lock, flags);
1676         get_signals(info);
1677         spin_unlock_irqrestore(&info->lock, flags);
1678         if (info->serial_signals & SerialSignal_DCD)
1679                 netif_carrier_on(dev);
1680         else
1681                 netif_carrier_off(dev);
1682         return 0;
1683 }
1684
1685 /**
1686  * called by network layer when interface is disabled
1687  * shutdown hardware and release resources
1688  *
1689  * dev  pointer to network device structure
1690  *
1691  * returns 0 if success, otherwise error code
1692  */
1693 static int hdlcdev_close(struct net_device *dev)
1694 {
1695         SLMP_INFO *info = dev_to_port(dev);
1696         unsigned long flags;
1697
1698         if (debug_level >= DEBUG_LEVEL_INFO)
1699                 printk("%s:hdlcdev_close(%s)\n",__FILE__,dev->name);
1700
1701         netif_stop_queue(dev);
1702
1703         /* shutdown adapter and release resources */
1704         shutdown(info);
1705
1706         hdlc_close(dev);
1707
1708         spin_lock_irqsave(&info->netlock, flags);
1709         info->netcount=0;
1710         spin_unlock_irqrestore(&info->netlock, flags);
1711
1712         return 0;
1713 }
1714
1715 /**
1716  * called by network layer to process IOCTL call to network device
1717  *
1718  * dev  pointer to network device structure
1719  * ifr  pointer to network interface request structure
1720  * cmd  IOCTL command code
1721  *
1722  * returns 0 if success, otherwise error code
1723  */
1724 static int hdlcdev_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
1725 {
1726         const size_t size = sizeof(sync_serial_settings);
1727         sync_serial_settings new_line;
1728         sync_serial_settings __user *line = ifr->ifr_settings.ifs_ifsu.sync;
1729         SLMP_INFO *info = dev_to_port(dev);
1730         unsigned int flags;
1731
1732         if (debug_level >= DEBUG_LEVEL_INFO)
1733                 printk("%s:hdlcdev_ioctl(%s)\n",__FILE__,dev->name);
1734
1735         /* return error if TTY interface open */
1736         if (info->port.count)
1737                 return -EBUSY;
1738
1739         if (cmd != SIOCWANDEV)
1740                 return hdlc_ioctl(dev, ifr, cmd);
1741
1742         switch(ifr->ifr_settings.type) {
1743         case IF_GET_IFACE: /* return current sync_serial_settings */
1744
1745                 ifr->ifr_settings.type = IF_IFACE_SYNC_SERIAL;
1746                 if (ifr->ifr_settings.size < size) {
1747                         ifr->ifr_settings.size = size; /* data size wanted */
1748                         return -ENOBUFS;
1749                 }
1750
1751                 flags = info->params.flags & (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_RXC_DPLL |
1752                                               HDLC_FLAG_RXC_BRG    | HDLC_FLAG_RXC_TXCPIN |
1753                                               HDLC_FLAG_TXC_TXCPIN | HDLC_FLAG_TXC_DPLL |
1754                                               HDLC_FLAG_TXC_BRG    | HDLC_FLAG_TXC_RXCPIN);
1755
1756                 memset(&new_line, 0, sizeof(new_line));
1757                 switch (flags){
1758                 case (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_TXCPIN): new_line.clock_type = CLOCK_EXT; break;
1759                 case (HDLC_FLAG_RXC_BRG    | HDLC_FLAG_TXC_BRG):    new_line.clock_type = CLOCK_INT; break;
1760                 case (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_BRG):    new_line.clock_type = CLOCK_TXINT; break;
1761                 case (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_RXCPIN): new_line.clock_type = CLOCK_TXFROMRX; break;
1762                 default: new_line.clock_type = CLOCK_DEFAULT;
1763                 }
1764
1765                 new_line.clock_rate = info->params.clock_speed;
1766                 new_line.loopback   = info->params.loopback ? 1:0;
1767
1768                 if (copy_to_user(line, &new_line, size))
1769                         return -EFAULT;
1770                 return 0;
1771
1772         case IF_IFACE_SYNC_SERIAL: /* set sync_serial_settings */
1773
1774                 if(!capable(CAP_NET_ADMIN))
1775                         return -EPERM;
1776                 if (copy_from_user(&new_line, line, size))
1777                         return -EFAULT;
1778
1779                 switch (new_line.clock_type)
1780                 {
1781                 case CLOCK_EXT:      flags = HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_TXCPIN; break;
1782                 case CLOCK_TXFROMRX: flags = HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_RXCPIN; break;
1783                 case CLOCK_INT:      flags = HDLC_FLAG_RXC_BRG    | HDLC_FLAG_TXC_BRG;    break;
1784                 case CLOCK_TXINT:    flags = HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_BRG;    break;
1785                 case CLOCK_DEFAULT:  flags = info->params.flags &
1786                                              (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_RXC_DPLL |
1787                                               HDLC_FLAG_RXC_BRG    | HDLC_FLAG_RXC_TXCPIN |
1788                                               HDLC_FLAG_TXC_TXCPIN | HDLC_FLAG_TXC_DPLL |
1789                                               HDLC_FLAG_TXC_BRG    | HDLC_FLAG_TXC_RXCPIN); break;
1790                 default: return -EINVAL;
1791                 }
1792
1793                 if (new_line.loopback != 0 && new_line.loopback != 1)
1794                         return -EINVAL;
1795
1796                 info->params.flags &= ~(HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_RXC_DPLL |
1797                                         HDLC_FLAG_RXC_BRG    | HDLC_FLAG_RXC_TXCPIN |
1798                                         HDLC_FLAG_TXC_TXCPIN | HDLC_FLAG_TXC_DPLL |
1799                                         HDLC_FLAG_TXC_BRG    | HDLC_FLAG_TXC_RXCPIN);
1800                 info->params.flags |= flags;
1801
1802                 info->params.loopback = new_line.loopback;
1803
1804                 if (flags & (HDLC_FLAG_RXC_BRG | HDLC_FLAG_TXC_BRG))
1805                         info->params.clock_speed = new_line.clock_rate;
1806                 else
1807                         info->params.clock_speed = 0;
1808
1809                 /* if network interface up, reprogram hardware */
1810                 if (info->netcount)
1811                         program_hw(info);
1812                 return 0;
1813
1814         default:
1815                 return hdlc_ioctl(dev, ifr, cmd);
1816         }
1817 }
1818
1819 /**
1820  * called by network layer when transmit timeout is detected
1821  *
1822  * dev  pointer to network device structure
1823  */
1824 static void hdlcdev_tx_timeout(struct net_device *dev)
1825 {
1826         SLMP_INFO *info = dev_to_port(dev);
1827         unsigned long flags;
1828
1829         if (debug_level >= DEBUG_LEVEL_INFO)
1830                 printk("hdlcdev_tx_timeout(%s)\n",dev->name);
1831
1832         dev->stats.tx_errors++;
1833         dev->stats.tx_aborted_errors++;
1834
1835         spin_lock_irqsave(&info->lock,flags);
1836         tx_stop(info);
1837         spin_unlock_irqrestore(&info->lock,flags);
1838
1839         netif_wake_queue(dev);
1840 }
1841
1842 /**
1843  * called by device driver when transmit completes
1844  * reenable network layer transmit if stopped
1845  *
1846  * info  pointer to device instance information
1847  */
1848 static void hdlcdev_tx_done(SLMP_INFO *info)
1849 {
1850         if (netif_queue_stopped(info->netdev))
1851                 netif_wake_queue(info->netdev);
1852 }
1853
1854 /**
1855  * called by device driver when frame received
1856  * pass frame to network layer
1857  *
1858  * info  pointer to device instance information
1859  * buf   pointer to buffer contianing frame data
1860  * size  count of data bytes in buf
1861  */
1862 static void hdlcdev_rx(SLMP_INFO *info, char *buf, int size)
1863 {
1864         struct sk_buff *skb = dev_alloc_skb(size);
1865         struct net_device *dev = info->netdev;
1866
1867         if (debug_level >= DEBUG_LEVEL_INFO)
1868                 printk("hdlcdev_rx(%s)\n",dev->name);
1869
1870         if (skb == NULL) {
1871                 printk(KERN_NOTICE "%s: can't alloc skb, dropping packet\n",
1872                        dev->name);
1873                 dev->stats.rx_dropped++;
1874                 return;
1875         }
1876
1877         memcpy(skb_put(skb, size), buf, size);
1878
1879         skb->protocol = hdlc_type_trans(skb, dev);
1880
1881         dev->stats.rx_packets++;
1882         dev->stats.rx_bytes += size;
1883
1884         netif_rx(skb);
1885 }
1886
1887 static const struct net_device_ops hdlcdev_ops = {
1888         .ndo_open       = hdlcdev_open,
1889         .ndo_stop       = hdlcdev_close,
1890         .ndo_change_mtu = hdlc_change_mtu,
1891         .ndo_start_xmit = hdlc_start_xmit,
1892         .ndo_do_ioctl   = hdlcdev_ioctl,
1893         .ndo_tx_timeout = hdlcdev_tx_timeout,
1894 };
1895
1896 /**
1897  * called by device driver when adding device instance
1898  * do generic HDLC initialization
1899  *
1900  * info  pointer to device instance information
1901  *
1902  * returns 0 if success, otherwise error code
1903  */
1904 static int hdlcdev_init(SLMP_INFO *info)
1905 {
1906         int rc;
1907         struct net_device *dev;
1908         hdlc_device *hdlc;
1909
1910         /* allocate and initialize network and HDLC layer objects */
1911
1912         dev = alloc_hdlcdev(info);
1913         if (!dev) {
1914                 printk(KERN_ERR "%s:hdlc device allocation failure\n",__FILE__);
1915                 return -ENOMEM;
1916         }
1917
1918         /* for network layer reporting purposes only */
1919         dev->mem_start = info->phys_sca_base;
1920         dev->mem_end   = info->phys_sca_base + SCA_BASE_SIZE - 1;
1921         dev->irq       = info->irq_level;
1922
1923         /* network layer callbacks and settings */
1924         dev->netdev_ops     = &hdlcdev_ops;
1925         dev->watchdog_timeo = 10 * HZ;
1926         dev->tx_queue_len   = 50;
1927
1928         /* generic HDLC layer callbacks and settings */
1929         hdlc         = dev_to_hdlc(dev);
1930         hdlc->attach = hdlcdev_attach;
1931         hdlc->xmit   = hdlcdev_xmit;
1932
1933         /* register objects with HDLC layer */
1934         rc = register_hdlc_device(dev);
1935         if (rc) {
1936                 printk(KERN_WARNING "%s:unable to register hdlc device\n",__FILE__);
1937                 free_netdev(dev);
1938                 return rc;
1939         }
1940
1941         info->netdev = dev;
1942         return 0;
1943 }
1944
1945 /**
1946  * called by device driver when removing device instance
1947  * do generic HDLC cleanup
1948  *
1949  * info  pointer to device instance information
1950  */
1951 static void hdlcdev_exit(SLMP_INFO *info)
1952 {
1953         unregister_hdlc_device(info->netdev);
1954         free_netdev(info->netdev);
1955         info->netdev = NULL;
1956 }
1957
1958 #endif /* CONFIG_HDLC */
1959
1960
1961 /* Return next bottom half action to perform.
1962  * Return Value:        BH action code or 0 if nothing to do.
1963  */
1964 static int bh_action(SLMP_INFO *info)
1965 {
1966         unsigned long flags;
1967         int rc = 0;
1968
1969         spin_lock_irqsave(&info->lock,flags);
1970
1971         if (info->pending_bh & BH_RECEIVE) {
1972                 info->pending_bh &= ~BH_RECEIVE;
1973                 rc = BH_RECEIVE;
1974         } else if (info->pending_bh & BH_TRANSMIT) {
1975                 info->pending_bh &= ~BH_TRANSMIT;
1976                 rc = BH_TRANSMIT;
1977         } else if (info->pending_bh & BH_STATUS) {
1978                 info->pending_bh &= ~BH_STATUS;
1979                 rc = BH_STATUS;
1980         }
1981
1982         if (!rc) {
1983                 /* Mark BH routine as complete */
1984                 info->bh_running = false;
1985                 info->bh_requested = false;
1986         }
1987
1988         spin_unlock_irqrestore(&info->lock,flags);
1989
1990         return rc;
1991 }
1992
1993 /* Perform bottom half processing of work items queued by ISR.
1994  */
1995 static void bh_handler(struct work_struct *work)
1996 {
1997         SLMP_INFO *info = container_of(work, SLMP_INFO, task);
1998         int action;
1999
2000         if ( debug_level >= DEBUG_LEVEL_BH )
2001                 printk( "%s(%d):%s bh_handler() entry\n",
2002                         __FILE__,__LINE__,info->device_name);
2003
2004         info->bh_running = true;
2005
2006         while((action = bh_action(info)) != 0) {
2007
2008                 /* Process work item */
2009                 if ( debug_level >= DEBUG_LEVEL_BH )
2010                         printk( "%s(%d):%s bh_handler() work item action=%d\n",
2011                                 __FILE__,__LINE__,info->device_name, action);
2012
2013                 switch (action) {
2014
2015                 case BH_RECEIVE:
2016                         bh_receive(info);
2017                         break;
2018                 case BH_TRANSMIT:
2019                         bh_transmit(info);
2020                         break;
2021                 case BH_STATUS:
2022                         bh_status(info);
2023                         break;
2024                 default:
2025                         /* unknown work item ID */
2026                         printk("%s(%d):%s Unknown work item ID=%08X!\n",
2027                                 __FILE__,__LINE__,info->device_name,action);
2028                         break;
2029                 }
2030         }
2031
2032         if ( debug_level >= DEBUG_LEVEL_BH )
2033                 printk( "%s(%d):%s bh_handler() exit\n",
2034                         __FILE__,__LINE__,info->device_name);
2035 }
2036
2037 static void bh_receive(SLMP_INFO *info)
2038 {
2039         if ( debug_level >= DEBUG_LEVEL_BH )
2040                 printk( "%s(%d):%s bh_receive()\n",
2041                         __FILE__,__LINE__,info->device_name);
2042
2043         while( rx_get_frame(info) );
2044 }
2045
2046 static void bh_transmit(SLMP_INFO *info)
2047 {
2048         struct tty_struct *tty = info->port.tty;
2049
2050         if ( debug_level >= DEBUG_LEVEL_BH )
2051                 printk( "%s(%d):%s bh_transmit() entry\n",
2052                         __FILE__,__LINE__,info->device_name);
2053
2054         if (tty)
2055                 tty_wakeup(tty);
2056 }
2057
2058 static void bh_status(SLMP_INFO *info)
2059 {
2060         if ( debug_level >= DEBUG_LEVEL_BH )
2061                 printk( "%s(%d):%s bh_status() entry\n",
2062                         __FILE__,__LINE__,info->device_name);
2063
2064         info->ri_chkcount = 0;
2065         info->dsr_chkcount = 0;
2066         info->dcd_chkcount = 0;
2067         info->cts_chkcount = 0;
2068 }
2069
2070 static void isr_timer(SLMP_INFO * info)
2071 {
2072         unsigned char timer = (info->port_num & 1) ? TIMER2 : TIMER0;
2073
2074         /* IER2<7..4> = timer<3..0> interrupt enables (0=disabled) */
2075         write_reg(info, IER2, 0);
2076
2077         /* TMCS, Timer Control/Status Register
2078          *
2079          * 07      CMF, Compare match flag (read only) 1=match
2080          * 06      ECMI, CMF Interrupt Enable: 0=disabled
2081          * 05      Reserved, must be 0
2082          * 04      TME, Timer Enable
2083          * 03..00  Reserved, must be 0
2084          *
2085          * 0000 0000
2086          */
2087         write_reg(info, (unsigned char)(timer + TMCS), 0);
2088
2089         info->irq_occurred = true;
2090
2091         if ( debug_level >= DEBUG_LEVEL_ISR )
2092                 printk("%s(%d):%s isr_timer()\n",
2093                         __FILE__,__LINE__,info->device_name);
2094 }
2095
2096 static void isr_rxint(SLMP_INFO * info)
2097 {
2098         struct tty_struct *tty = info->port.tty;
2099         struct  mgsl_icount *icount = &info->icount;
2100         unsigned char status = read_reg(info, SR1) & info->ie1_value & (FLGD + IDLD + CDCD + BRKD);
2101         unsigned char status2 = read_reg(info, SR2) & info->ie2_value & OVRN;
2102
2103         /* clear status bits */
2104         if (status)
2105                 write_reg(info, SR1, status);
2106
2107         if (status2)
2108                 write_reg(info, SR2, status2);
2109
2110         if ( debug_level >= DEBUG_LEVEL_ISR )
2111                 printk("%s(%d):%s isr_rxint status=%02X %02x\n",
2112                         __FILE__,__LINE__,info->device_name,status,status2);
2113
2114         if (info->params.mode == MGSL_MODE_ASYNC) {
2115                 if (status & BRKD) {
2116                         icount->brk++;
2117
2118                         /* process break detection if tty control
2119                          * is not set to ignore it
2120                          */
2121                         if (!(status & info->ignore_status_mask1)) {
2122                                 if (info->read_status_mask1 & BRKD) {
2123                                         tty_insert_flip_char(&info->port, 0, TTY_BREAK);
2124                                         if (tty && (info->port.flags & ASYNC_SAK))
2125                                                 do_SAK(tty);
2126                                 }
2127                         }
2128                 }
2129         }
2130         else {
2131                 if (status & (FLGD|IDLD)) {
2132                         if (status & FLGD)
2133                                 info->icount.exithunt++;
2134                         else if (status & IDLD)
2135                                 info->icount.rxidle++;
2136                         wake_up_interruptible(&info->event_wait_q);
2137                 }
2138         }
2139
2140         if (status & CDCD) {
2141                 /* simulate a common modem status change interrupt
2142                  * for our handler
2143                  */
2144                 get_signals( info );
2145                 isr_io_pin(info,
2146                         MISCSTATUS_DCD_LATCHED|(info->serial_signals&SerialSignal_DCD));
2147         }
2148 }
2149
2150 /*
2151  * handle async rx data interrupts
2152  */
2153 static void isr_rxrdy(SLMP_INFO * info)
2154 {
2155         u16 status;
2156         unsigned char DataByte;
2157         struct  mgsl_icount *icount = &info->icount;
2158
2159         if ( debug_level >= DEBUG_LEVEL_ISR )
2160                 printk("%s(%d):%s isr_rxrdy\n",
2161                         __FILE__,__LINE__,info->device_name);
2162
2163         while((status = read_reg(info,CST0)) & BIT0)
2164         {
2165                 int flag = 0;
2166                 bool over = false;
2167                 DataByte = read_reg(info,TRB);
2168
2169                 icount->rx++;
2170
2171                 if ( status & (PE + FRME + OVRN) ) {
2172                         printk("%s(%d):%s rxerr=%04X\n",
2173                                 __FILE__,__LINE__,info->device_name,status);
2174
2175                         /* update error statistics */
2176                         if (status & PE)
2177                                 icount->parity++;
2178                         else if (status & FRME)
2179                                 icount->frame++;
2180                         else if (status & OVRN)
2181                                 icount->overrun++;
2182
2183                         /* discard char if tty control flags say so */
2184                         if (status & info->ignore_status_mask2)
2185                                 continue;
2186
2187                         status &= info->read_status_mask2;
2188
2189                         if (status & PE)
2190                                 flag = TTY_PARITY;
2191                         else if (status & FRME)
2192                                 flag = TTY_FRAME;
2193                         if (status & OVRN) {
2194                                 /* Overrun is special, since it's
2195                                  * reported immediately, and doesn't
2196                                  * affect the current character
2197                                  */
2198                                 over = true;
2199                         }
2200                 }       /* end of if (error) */
2201
2202                 tty_insert_flip_char(&info->port, DataByte, flag);
2203                 if (over)
2204                         tty_insert_flip_char(&info->port, 0, TTY_OVERRUN);
2205         }
2206
2207         if ( debug_level >= DEBUG_LEVEL_ISR ) {
2208                 printk("%s(%d):%s rx=%d brk=%d parity=%d frame=%d overrun=%d\n",
2209                         __FILE__,__LINE__,info->device_name,
2210                         icount->rx,icount->brk,icount->parity,
2211                         icount->frame,icount->overrun);
2212         }
2213
2214         tty_flip_buffer_push(&info->port);
2215 }
2216
2217 static void isr_txeom(SLMP_INFO * info, unsigned char status)
2218 {
2219         if ( debug_level >= DEBUG_LEVEL_ISR )
2220                 printk("%s(%d):%s isr_txeom status=%02x\n",
2221                         __FILE__,__LINE__,info->device_name,status);
2222
2223         write_reg(info, TXDMA + DIR, 0x00); /* disable Tx DMA IRQs */
2224         write_reg(info, TXDMA + DSR, 0xc0); /* clear IRQs and disable DMA */
2225         write_reg(info, TXDMA + DCMD, SWABORT); /* reset/init DMA channel */
2226
2227         if (status & UDRN) {
2228                 write_reg(info, CMD, TXRESET);
2229                 write_reg(info, CMD, TXENABLE);
2230         } else
2231                 write_reg(info, CMD, TXBUFCLR);
2232
2233         /* disable and clear tx interrupts */
2234         info->ie0_value &= ~TXRDYE;
2235         info->ie1_value &= ~(IDLE + UDRN);
2236         write_reg16(info, IE0, (unsigned short)((info->ie1_value << 8) + info->ie0_value));
2237         write_reg(info, SR1, (unsigned char)(UDRN + IDLE));
2238
2239         if ( info->tx_active ) {
2240                 if (info->params.mode != MGSL_MODE_ASYNC) {
2241                         if (status & UDRN)
2242                                 info->icount.txunder++;
2243                         else if (status & IDLE)
2244                                 info->icount.txok++;
2245                 }
2246
2247                 info->tx_active = false;
2248                 info->tx_count = info->tx_put = info->tx_get = 0;
2249
2250                 del_timer(&info->tx_timer);
2251
2252                 if (info->params.mode != MGSL_MODE_ASYNC && info->drop_rts_on_tx_done ) {
2253                         info->serial_signals &= ~SerialSignal_RTS;
2254                         info->drop_rts_on_tx_done = false;
2255                         set_signals(info);
2256                 }
2257
2258 #if SYNCLINK_GENERIC_HDLC
2259                 if (info->netcount)
2260                         hdlcdev_tx_done(info);
2261                 else
2262 #endif
2263                 {
2264                         if (info->port.tty && (info->port.tty->stopped || info->port.tty->hw_stopped)) {
2265                                 tx_stop(info);
2266                                 return;
2267                         }
2268                         info->pending_bh |= BH_TRANSMIT;
2269                 }
2270         }
2271 }
2272
2273
2274 /*
2275  * handle tx status interrupts
2276  */
2277 static void isr_txint(SLMP_INFO * info)
2278 {
2279         unsigned char status = read_reg(info, SR1) & info->ie1_value & (UDRN + IDLE + CCTS);
2280
2281         /* clear status bits */
2282         write_reg(info, SR1, status);
2283
2284         if ( debug_level >= DEBUG_LEVEL_ISR )
2285                 printk("%s(%d):%s isr_txint status=%02x\n",
2286                         __FILE__,__LINE__,info->device_name,status);
2287
2288         if (status & (UDRN + IDLE))
2289                 isr_txeom(info, status);
2290
2291         if (status & CCTS) {
2292                 /* simulate a common modem status change interrupt
2293                  * for our handler
2294                  */
2295                 get_signals( info );
2296                 isr_io_pin(info,
2297                         MISCSTATUS_CTS_LATCHED|(info->serial_signals&SerialSignal_CTS));
2298
2299         }
2300 }
2301
2302 /*
2303  * handle async tx data interrupts
2304  */
2305 static void isr_txrdy(SLMP_INFO * info)
2306 {
2307         if ( debug_level >= DEBUG_LEVEL_ISR )
2308                 printk("%s(%d):%s isr_txrdy() tx_count=%d\n",
2309                         __FILE__,__LINE__,info->device_name,info->tx_count);
2310
2311         if (info->params.mode != MGSL_MODE_ASYNC) {
2312                 /* disable TXRDY IRQ, enable IDLE IRQ */
2313                 info->ie0_value &= ~TXRDYE;
2314                 info->ie1_value |= IDLE;
2315                 write_reg16(info, IE0, (unsigned short)((info->ie1_value << 8) + info->ie0_value));
2316                 return;
2317         }
2318
2319         if (info->port.tty && (info->port.tty->stopped || info->port.tty->hw_stopped)) {
2320                 tx_stop(info);
2321                 return;
2322         }
2323
2324         if ( info->tx_count )
2325                 tx_load_fifo( info );
2326         else {
2327                 info->tx_active = false;
2328                 info->ie0_value &= ~TXRDYE;
2329                 write_reg(info, IE0, info->ie0_value);
2330         }
2331
2332         if (info->tx_count < WAKEUP_CHARS)
2333                 info->pending_bh |= BH_TRANSMIT;
2334 }
2335
2336 static void isr_rxdmaok(SLMP_INFO * info)
2337 {
2338         /* BIT7 = EOT (end of transfer)
2339          * BIT6 = EOM (end of message/frame)
2340          */
2341         unsigned char status = read_reg(info,RXDMA + DSR) & 0xc0;
2342
2343         /* clear IRQ (BIT0 must be 1 to prevent clearing DE bit) */
2344         write_reg(info, RXDMA + DSR, (unsigned char)(status | 1));
2345
2346         if ( debug_level >= DEBUG_LEVEL_ISR )
2347                 printk("%s(%d):%s isr_rxdmaok(), status=%02x\n",
2348                         __FILE__,__LINE__,info->device_name,status);
2349
2350         info->pending_bh |= BH_RECEIVE;
2351 }
2352
2353 static void isr_rxdmaerror(SLMP_INFO * info)
2354 {
2355         /* BIT5 = BOF (buffer overflow)
2356          * BIT4 = COF (counter overflow)
2357          */
2358         unsigned char status = read_reg(info,RXDMA + DSR) & 0x30;
2359
2360         /* clear IRQ (BIT0 must be 1 to prevent clearing DE bit) */
2361         write_reg(info, RXDMA + DSR, (unsigned char)(status | 1));
2362
2363         if ( debug_level >= DEBUG_LEVEL_ISR )
2364                 printk("%s(%d):%s isr_rxdmaerror(), status=%02x\n",
2365                         __FILE__,__LINE__,info->device_name,status);
2366
2367         info->rx_overflow = true;
2368         info->pending_bh |= BH_RECEIVE;
2369 }
2370
2371 static void isr_txdmaok(SLMP_INFO * info)
2372 {
2373         unsigned char status_reg1 = read_reg(info, SR1);
2374
2375         write_reg(info, TXDMA + DIR, 0x00);     /* disable Tx DMA IRQs */
2376         write_reg(info, TXDMA + DSR, 0xc0); /* clear IRQs and disable DMA */
2377         write_reg(info, TXDMA + DCMD, SWABORT); /* reset/init DMA channel */
2378
2379         if ( debug_level >= DEBUG_LEVEL_ISR )
2380                 printk("%s(%d):%s isr_txdmaok(), status=%02x\n",
2381                         __FILE__,__LINE__,info->device_name,status_reg1);
2382
2383         /* program TXRDY as FIFO empty flag, enable TXRDY IRQ */
2384         write_reg16(info, TRC0, 0);
2385         info->ie0_value |= TXRDYE;
2386         write_reg(info, IE0, info->ie0_value);
2387 }
2388
2389 static void isr_txdmaerror(SLMP_INFO * info)
2390 {
2391         /* BIT5 = BOF (buffer overflow)
2392          * BIT4 = COF (counter overflow)
2393          */
2394         unsigned char status = read_reg(info,TXDMA + DSR) & 0x30;
2395
2396         /* clear IRQ (BIT0 must be 1 to prevent clearing DE bit) */
2397         write_reg(info, TXDMA + DSR, (unsigned char)(status | 1));
2398
2399         if ( debug_level >= DEBUG_LEVEL_ISR )
2400                 printk("%s(%d):%s isr_txdmaerror(), status=%02x\n",
2401                         __FILE__,__LINE__,info->device_name,status);
2402 }
2403
2404 /* handle input serial signal changes
2405  */
2406 static void isr_io_pin( SLMP_INFO *info, u16 status )
2407 {
2408         struct  mgsl_icount *icount;
2409
2410         if ( debug_level >= DEBUG_LEVEL_ISR )
2411                 printk("%s(%d):isr_io_pin status=%04X\n",
2412                         __FILE__,__LINE__,status);
2413
2414         if (status & (MISCSTATUS_CTS_LATCHED | MISCSTATUS_DCD_LATCHED |
2415                       MISCSTATUS_DSR_LATCHED | MISCSTATUS_RI_LATCHED) ) {
2416                 icount = &info->icount;
2417                 /* update input line counters */
2418                 if (status & MISCSTATUS_RI_LATCHED) {
2419                         icount->rng++;
2420                         if ( status & SerialSignal_RI )
2421                                 info->input_signal_events.ri_up++;
2422                         else
2423                                 info->input_signal_events.ri_down++;
2424                 }
2425                 if (status & MISCSTATUS_DSR_LATCHED) {
2426                         icount->dsr++;
2427                         if ( status & SerialSignal_DSR )
2428                                 info->input_signal_events.dsr_up++;
2429                         else
2430                                 info->input_signal_events.dsr_down++;
2431                 }
2432                 if (status & MISCSTATUS_DCD_LATCHED) {
2433                         if ((info->dcd_chkcount)++ >= IO_PIN_SHUTDOWN_LIMIT) {
2434                                 info->ie1_value &= ~CDCD;
2435                                 write_reg(info, IE1, info->ie1_value);
2436                         }
2437                         icount->dcd++;
2438                         if (status & SerialSignal_DCD) {
2439                                 info->input_signal_events.dcd_up++;
2440                         } else
2441                                 info->input_signal_events.dcd_down++;
2442 #if SYNCLINK_GENERIC_HDLC
2443                         if (info->netcount) {
2444                                 if (status & SerialSignal_DCD)
2445                                         netif_carrier_on(info->netdev);
2446                                 else
2447                                         netif_carrier_off(info->netdev);
2448                         }
2449 #endif
2450                 }
2451                 if (status & MISCSTATUS_CTS_LATCHED)
2452                 {
2453                         if ((info->cts_chkcount)++ >= IO_PIN_SHUTDOWN_LIMIT) {
2454                                 info->ie1_value &= ~CCTS;
2455                                 write_reg(info, IE1, info->ie1_value);
2456                         }
2457                         icount->cts++;
2458                         if ( status & SerialSignal_CTS )
2459                                 info->input_signal_events.cts_up++;
2460                         else
2461                                 info->input_signal_events.cts_down++;
2462                 }
2463                 wake_up_interruptible(&info->status_event_wait_q);
2464                 wake_up_interruptible(&info->event_wait_q);
2465
2466                 if (tty_port_check_carrier(&info->port) &&
2467                      (status & MISCSTATUS_DCD_LATCHED) ) {
2468                         if ( debug_level >= DEBUG_LEVEL_ISR )
2469                                 printk("%s CD now %s...", info->device_name,
2470                                        (status & SerialSignal_DCD) ? "on" : "off");
2471                         if (status & SerialSignal_DCD)
2472                                 wake_up_interruptible(&info->port.open_wait);
2473                         else {
2474                                 if ( debug_level >= DEBUG_LEVEL_ISR )
2475                                         printk("doing serial hangup...");
2476                                 if (info->port.tty)
2477                                         tty_hangup(info->port.tty);
2478                         }
2479                 }
2480
2481                 if (tty_port_cts_enabled(&info->port) &&
2482                      (status & MISCSTATUS_CTS_LATCHED) ) {
2483                         if ( info->port.tty ) {
2484                                 if (info->port.tty->hw_stopped) {
2485                                         if (status & SerialSignal_CTS) {
2486                                                 if ( debug_level >= DEBUG_LEVEL_ISR )
2487                                                         printk("CTS tx start...");
2488                                                 info->port.tty->hw_stopped = 0;
2489                                                 tx_start(info);
2490                                                 info->pending_bh |= BH_TRANSMIT;
2491                                                 return;
2492                                         }
2493                                 } else {
2494                                         if (!(status & SerialSignal_CTS)) {
2495                                                 if ( debug_level >= DEBUG_LEVEL_ISR )
2496                                                         printk("CTS tx stop...");
2497                                                 info->port.tty->hw_stopped = 1;
2498                                                 tx_stop(info);
2499                                         }
2500                                 }
2501                         }
2502                 }
2503         }
2504
2505         info->pending_bh |= BH_STATUS;
2506 }
2507
2508 /* Interrupt service routine entry point.
2509  *
2510  * Arguments:
2511  *      irq             interrupt number that caused interrupt
2512  *      dev_id          device ID supplied during interrupt registration
2513  *      regs            interrupted processor context
2514  */
2515 static irqreturn_t synclinkmp_interrupt(int dummy, void *dev_id)
2516 {
2517         SLMP_INFO *info = dev_id;
2518         unsigned char status, status0, status1=0;
2519         unsigned char dmastatus, dmastatus0, dmastatus1=0;
2520         unsigned char timerstatus0, timerstatus1=0;
2521         unsigned char shift;
2522         unsigned int i;
2523         unsigned short tmp;
2524
2525         if ( debug_level >= DEBUG_LEVEL_ISR )
2526                 printk(KERN_DEBUG "%s(%d): synclinkmp_interrupt(%d)entry.\n",
2527                         __FILE__, __LINE__, info->irq_level);
2528
2529         spin_lock(&info->lock);
2530
2531         for(;;) {
2532
2533                 /* get status for SCA0 (ports 0-1) */
2534                 tmp = read_reg16(info, ISR0);   /* get ISR0 and ISR1 in one read */
2535                 status0 = (unsigned char)tmp;
2536                 dmastatus0 = (unsigned char)(tmp>>8);
2537                 timerstatus0 = read_reg(info, ISR2);
2538
2539                 if ( debug_level >= DEBUG_LEVEL_ISR )
2540                         printk(KERN_DEBUG "%s(%d):%s status0=%02x, dmastatus0=%02x, timerstatus0=%02x\n",
2541                                 __FILE__, __LINE__, info->device_name,
2542                                 status0, dmastatus0, timerstatus0);
2543
2544                 if (info->port_count == 4) {
2545                         /* get status for SCA1 (ports 2-3) */
2546                         tmp = read_reg16(info->port_array[2], ISR0);
2547                         status1 = (unsigned char)tmp;
2548                         dmastatus1 = (unsigned char)(tmp>>8);
2549                         timerstatus1 = read_reg(info->port_array[2], ISR2);
2550
2551                         if ( debug_level >= DEBUG_LEVEL_ISR )
2552                                 printk("%s(%d):%s status1=%02x, dmastatus1=%02x, timerstatus1=%02x\n",
2553                                         __FILE__,__LINE__,info->device_name,
2554                                         status1,dmastatus1,timerstatus1);
2555                 }
2556
2557                 if (!status0 && !dmastatus0 && !timerstatus0 &&
2558                          !status1 && !dmastatus1 && !timerstatus1)
2559                         break;
2560
2561                 for(i=0; i < info->port_count ; i++) {
2562                         if (info->port_array[i] == NULL)
2563                                 continue;
2564                         if (i < 2) {
2565                                 status = status0;
2566                                 dmastatus = dmastatus0;
2567                         } else {
2568                                 status = status1;
2569                                 dmastatus = dmastatus1;
2570                         }
2571
2572                         shift = i & 1 ? 4 :0;
2573
2574                         if (status & BIT0 << shift)
2575                                 isr_rxrdy(info->port_array[i]);
2576                         if (status & BIT1 << shift)
2577                                 isr_txrdy(info->port_array[i]);
2578                         if (status & BIT2 << shift)
2579                                 isr_rxint(info->port_array[i]);
2580                         if (status & BIT3 << shift)
2581                                 isr_txint(info->port_array[i]);
2582
2583                         if (dmastatus & BIT0 << shift)
2584                                 isr_rxdmaerror(info->port_array[i]);
2585                         if (dmastatus & BIT1 << shift)
2586                                 isr_rxdmaok(info->port_array[i]);
2587                         if (dmastatus & BIT2 << shift)
2588                                 isr_txdmaerror(info->port_array[i]);
2589                         if (dmastatus & BIT3 << shift)
2590                                 isr_txdmaok(info->port_array[i]);
2591                 }
2592
2593                 if (timerstatus0 & (BIT5 | BIT4))
2594                         isr_timer(info->port_array[0]);
2595                 if (timerstatus0 & (BIT7 | BIT6))
2596                         isr_timer(info->port_array[1]);
2597                 if (timerstatus1 & (BIT5 | BIT4))
2598                         isr_timer(info->port_array[2]);
2599                 if (timerstatus1 & (BIT7 | BIT6))
2600                         isr_timer(info->port_array[3]);
2601         }
2602
2603         for(i=0; i < info->port_count ; i++) {
2604                 SLMP_INFO * port = info->port_array[i];
2605
2606                 /* Request bottom half processing if there's something
2607                  * for it to do and the bh is not already running.
2608                  *
2609                  * Note: startup adapter diags require interrupts.
2610                  * do not request bottom half processing if the
2611                  * device is not open in a normal mode.
2612                  */
2613                 if ( port && (port->port.count || port->netcount) &&
2614                      port->pending_bh && !port->bh_running &&
2615                      !port->bh_requested ) {
2616                         if ( debug_level >= DEBUG_LEVEL_ISR )
2617                                 printk("%s(%d):%s queueing bh task.\n",
2618                                         __FILE__,__LINE__,port->device_name);
2619                         schedule_work(&port->task);
2620                         port->bh_requested = true;
2621                 }
2622         }
2623
2624         spin_unlock(&info->lock);
2625
2626         if ( debug_level >= DEBUG_LEVEL_ISR )
2627                 printk(KERN_DEBUG "%s(%d):synclinkmp_interrupt(%d)exit.\n",
2628                         __FILE__, __LINE__, info->irq_level);
2629         return IRQ_HANDLED;
2630 }
2631
2632 /* Initialize and start device.
2633  */
2634 static int startup(SLMP_INFO * info)
2635 {
2636         if ( debug_level >= DEBUG_LEVEL_INFO )
2637                 printk("%s(%d):%s tx_releaseup()\n",__FILE__,__LINE__,info->device_name);
2638
2639         if (tty_port_initialized(&info->port))
2640                 return 0;
2641
2642         if (!info->tx_buf) {
2643                 info->tx_buf = kmalloc(info->max_frame_size, GFP_KERNEL);
2644                 if (!info->tx_buf) {
2645                         printk(KERN_ERR"%s(%d):%s can't allocate transmit buffer\n",
2646                                 __FILE__,__LINE__,info->device_name);
2647                         return -ENOMEM;
2648                 }
2649         }
2650
2651         info->pending_bh = 0;
2652
2653         memset(&info->icount, 0, sizeof(info->icount));
2654
2655         /* program hardware for current parameters */
2656         reset_port(info);
2657
2658         change_params(info);
2659
2660         mod_timer(&info->status_timer, jiffies + msecs_to_jiffies(10));
2661
2662         if (info->port.tty)
2663                 clear_bit(TTY_IO_ERROR, &info->port.tty->flags);
2664
2665         tty_port_set_initialized(&info->port, 1);
2666
2667         return 0;
2668 }
2669
2670 /* Called by close() and hangup() to shutdown hardware
2671  */
2672 static void shutdown(SLMP_INFO * info)
2673 {
2674         unsigned long flags;
2675
2676         if (!tty_port_initialized(&info->port))
2677                 return;
2678
2679         if (debug_level >= DEBUG_LEVEL_INFO)
2680                 printk("%s(%d):%s synclinkmp_shutdown()\n",
2681                          __FILE__,__LINE__, info->device_name );
2682
2683         /* clear status wait queue because status changes */
2684         /* can't happen after shutting down the hardware */
2685         wake_up_interruptible(&info->status_event_wait_q);
2686         wake_up_interruptible(&info->event_wait_q);
2687
2688         del_timer(&info->tx_timer);
2689         del_timer(&info->status_timer);
2690
2691         kfree(info->tx_buf);
2692         info->tx_buf = NULL;
2693
2694         spin_lock_irqsave(&info->lock,flags);
2695
2696         reset_port(info);
2697
2698         if (!info->port.tty || info->port.tty->termios.c_cflag & HUPCL) {
2699                 info->serial_signals &= ~(SerialSignal_RTS | SerialSignal_DTR);
2700                 set_signals(info);
2701         }
2702
2703         spin_unlock_irqrestore(&info->lock,flags);
2704
2705         if (info->port.tty)
2706                 set_bit(TTY_IO_ERROR, &info->port.tty->flags);
2707
2708         tty_port_set_initialized(&info->port, 0);
2709 }
2710
2711 static void program_hw(SLMP_INFO *info)
2712 {
2713         unsigned long flags;
2714
2715         spin_lock_irqsave(&info->lock,flags);
2716
2717         rx_stop(info);
2718         tx_stop(info);
2719
2720         info->tx_count = info->tx_put = info->tx_get = 0;
2721
2722         if (info->params.mode == MGSL_MODE_HDLC || info->netcount)
2723                 hdlc_mode(info);
2724         else
2725                 async_mode(info);
2726
2727         set_signals(info);
2728
2729         info->dcd_chkcount = 0;
2730         info->cts_chkcount = 0;
2731         info->ri_chkcount = 0;
2732         info->dsr_chkcount = 0;
2733
2734         info->ie1_value |= (CDCD|CCTS);
2735         write_reg(info, IE1, info->ie1_value);
2736
2737         get_signals(info);
2738
2739         if (info->netcount || (info->port.tty && info->port.tty->termios.c_cflag & CREAD) )
2740                 rx_start(info);
2741
2742         spin_unlock_irqrestore(&info->lock,flags);
2743 }
2744
2745 /* Reconfigure adapter based on new parameters
2746  */
2747 static void change_params(SLMP_INFO *info)
2748 {
2749         unsigned cflag;
2750         int bits_per_char;
2751
2752         if (!info->port.tty)
2753                 return;
2754
2755         if (debug_level >= DEBUG_LEVEL_INFO)
2756                 printk("%s(%d):%s change_params()\n",
2757                          __FILE__,__LINE__, info->device_name );
2758
2759         cflag = info->port.tty->termios.c_cflag;
2760
2761         /* if B0 rate (hangup) specified then negate RTS and DTR */
2762         /* otherwise assert RTS and DTR */
2763         if (cflag & CBAUD)
2764                 info->serial_signals |= SerialSignal_RTS | SerialSignal_DTR;
2765         else
2766                 info->serial_signals &= ~(SerialSignal_RTS | SerialSignal_DTR);
2767
2768         /* byte size and parity */
2769
2770         switch (cflag & CSIZE) {
2771               case CS5: info->params.data_bits = 5; break;
2772               case CS6: info->params.data_bits = 6; break;
2773               case CS7: info->params.data_bits = 7; break;
2774               case CS8: info->params.data_bits = 8; break;
2775               /* Never happens, but GCC is too dumb to figure it out */
2776               default:  info->params.data_bits = 7; break;
2777               }
2778
2779         if (cflag & CSTOPB)
2780                 info->params.stop_bits = 2;
2781         else
2782                 info->params.stop_bits = 1;
2783
2784         info->params.parity = ASYNC_PARITY_NONE;
2785         if (cflag & PARENB) {
2786                 if (cflag & PARODD)
2787                         info->params.parity = ASYNC_PARITY_ODD;
2788                 else
2789                         info->params.parity = ASYNC_PARITY_EVEN;
2790 #ifdef CMSPAR
2791                 if (cflag & CMSPAR)
2792                         info->params.parity = ASYNC_PARITY_SPACE;
2793 #endif
2794         }
2795
2796         /* calculate number of jiffies to transmit a full
2797          * FIFO (32 bytes) at specified data rate
2798          */
2799         bits_per_char = info->params.data_bits +
2800                         info->params.stop_bits + 1;
2801
2802         /* if port data rate is set to 460800 or less then
2803          * allow tty settings to override, otherwise keep the
2804          * current data rate.
2805          */
2806         if (info->params.data_rate <= 460800) {
2807                 info->params.data_rate = tty_get_baud_rate(info->port.tty);
2808         }
2809
2810         if ( info->params.data_rate ) {
2811                 info->timeout = (32*HZ*bits_per_char) /
2812                                 info->params.data_rate;
2813         }
2814         info->timeout += HZ/50;         /* Add .02 seconds of slop */
2815
2816         tty_port_set_cts_flow(&info->port, cflag & CRTSCTS);
2817         tty_port_set_check_carrier(&info->port, ~cflag & CLOCAL);
2818
2819         /* process tty input control flags */
2820
2821         info->read_status_mask2 = OVRN;
2822         if (I_INPCK(info->port.tty))
2823                 info->read_status_mask2 |= PE | FRME;
2824         if (I_BRKINT(info->port.tty) || I_PARMRK(info->port.tty))
2825                 info->read_status_mask1 |= BRKD;
2826         if (I_IGNPAR(info->port.tty))
2827                 info->ignore_status_mask2 |= PE | FRME;
2828         if (I_IGNBRK(info->port.tty)) {
2829                 info->ignore_status_mask1 |= BRKD;
2830                 /* If ignoring parity and break indicators, ignore
2831                  * overruns too.  (For real raw support).
2832                  */
2833                 if (I_IGNPAR(info->port.tty))
2834                         info->ignore_status_mask2 |= OVRN;
2835         }
2836
2837         program_hw(info);
2838 }
2839
2840 static int get_stats(SLMP_INFO * info, struct mgsl_icount __user *user_icount)
2841 {
2842         int err;
2843
2844         if (debug_level >= DEBUG_LEVEL_INFO)
2845                 printk("%s(%d):%s get_params()\n",
2846                          __FILE__,__LINE__, info->device_name);
2847
2848         if (!user_icount) {
2849                 memset(&info->icount, 0, sizeof(info->icount));
2850         } else {
2851                 mutex_lock(&info->port.mutex);
2852                 COPY_TO_USER(err, user_icount, &info->icount, sizeof(struct mgsl_icount));
2853                 mutex_unlock(&info->port.mutex);
2854                 if (err)
2855                         return -EFAULT;
2856         }
2857
2858         return 0;
2859 }
2860
2861 static int get_params(SLMP_INFO * info, MGSL_PARAMS __user *user_params)
2862 {
2863         int err;
2864         if (debug_level >= DEBUG_LEVEL_INFO)
2865                 printk("%s(%d):%s get_params()\n",
2866                          __FILE__,__LINE__, info->device_name);
2867
2868         mutex_lock(&info->port.mutex);
2869         COPY_TO_USER(err,user_params, &info->params, sizeof(MGSL_PARAMS));
2870         mutex_unlock(&info->port.mutex);
2871         if (err) {
2872                 if ( debug_level >= DEBUG_LEVEL_INFO )
2873                         printk( "%s(%d):%s get_params() user buffer copy failed\n",
2874                                 __FILE__,__LINE__,info->device_name);
2875                 return -EFAULT;
2876         }
2877
2878         return 0;
2879 }
2880
2881 static int set_params(SLMP_INFO * info, MGSL_PARAMS __user *new_params)
2882 {
2883         unsigned long flags;
2884         MGSL_PARAMS tmp_params;
2885         int err;
2886
2887         if (debug_level >= DEBUG_LEVEL_INFO)
2888                 printk("%s(%d):%s set_params\n",
2889                         __FILE__,__LINE__,info->device_name );
2890         COPY_FROM_USER(err,&tmp_params, new_params, sizeof(MGSL_PARAMS));
2891         if (err) {
2892                 if ( debug_level >= DEBUG_LEVEL_INFO )
2893                         printk( "%s(%d):%s set_params() user buffer copy failed\n",
2894                                 __FILE__,__LINE__,info->device_name);
2895                 return -EFAULT;
2896         }
2897
2898         mutex_lock(&info->port.mutex);
2899         spin_lock_irqsave(&info->lock,flags);
2900         memcpy(&info->params,&tmp_params,sizeof(MGSL_PARAMS));
2901         spin_unlock_irqrestore(&info->lock,flags);
2902
2903         change_params(info);
2904         mutex_unlock(&info->port.mutex);
2905
2906         return 0;
2907 }
2908
2909 static int get_txidle(SLMP_INFO * info, int __user *idle_mode)
2910 {
2911         int err;
2912
2913         if (debug_level >= DEBUG_LEVEL_INFO)
2914                 printk("%s(%d):%s get_txidle()=%d\n",
2915                          __FILE__,__LINE__, info->device_name, info->idle_mode);
2916
2917         COPY_TO_USER(err,idle_mode, &info->idle_mode, sizeof(int));
2918         if (err) {
2919                 if ( debug_level >= DEBUG_LEVEL_INFO )
2920                         printk( "%s(%d):%s get_txidle() user buffer copy failed\n",
2921                                 __FILE__,__LINE__,info->device_name);
2922                 return -EFAULT;
2923         }
2924
2925         return 0;
2926 }
2927
2928 static int set_txidle(SLMP_INFO * info, int idle_mode)
2929 {
2930         unsigned long flags;
2931
2932         if (debug_level >= DEBUG_LEVEL_INFO)
2933                 printk("%s(%d):%s set_txidle(%d)\n",
2934                         __FILE__,__LINE__,info->device_name, idle_mode );
2935
2936         spin_lock_irqsave(&info->lock,flags);
2937         info->idle_mode = idle_mode;
2938         tx_set_idle( info );
2939         spin_unlock_irqrestore(&info->lock,flags);
2940         return 0;
2941 }
2942
2943 static int tx_enable(SLMP_INFO * info, int enable)
2944 {
2945         unsigned long flags;
2946
2947         if (debug_level >= DEBUG_LEVEL_INFO)
2948                 printk("%s(%d):%s tx_enable(%d)\n",
2949                         __FILE__,__LINE__,info->device_name, enable);
2950
2951         spin_lock_irqsave(&info->lock,flags);
2952         if ( enable ) {
2953                 if ( !info->tx_enabled ) {
2954                         tx_start(info);
2955                 }
2956         } else {
2957                 if ( info->tx_enabled )
2958                         tx_stop(info);
2959         }
2960         spin_unlock_irqrestore(&info->lock,flags);
2961         return 0;
2962 }
2963
2964 /* abort send HDLC frame
2965  */
2966 static int tx_abort(SLMP_INFO * info)
2967 {
2968         unsigned long flags;
2969
2970         if (debug_level >= DEBUG_LEVEL_INFO)
2971                 printk("%s(%d):%s tx_abort()\n",
2972                         __FILE__,__LINE__,info->device_name);
2973
2974         spin_lock_irqsave(&info->lock,flags);
2975         if ( info->tx_active && info->params.mode == MGSL_MODE_HDLC ) {
2976                 info->ie1_value &= ~UDRN;
2977                 info->ie1_value |= IDLE;
2978                 write_reg(info, IE1, info->ie1_value);  /* disable tx status interrupts */
2979                 write_reg(info, SR1, (unsigned char)(IDLE + UDRN));     /* clear pending */
2980
2981                 write_reg(info, TXDMA + DSR, 0);                /* disable DMA channel */
2982                 write_reg(info, TXDMA + DCMD, SWABORT); /* reset/init DMA channel */
2983
2984                 write_reg(info, CMD, TXABORT);
2985         }
2986         spin_unlock_irqrestore(&info->lock,flags);
2987         return 0;
2988 }
2989
2990 static int rx_enable(SLMP_INFO * info, int enable)
2991 {
2992         unsigned long flags;
2993
2994         if (debug_level >= DEBUG_LEVEL_INFO)
2995                 printk("%s(%d):%s rx_enable(%d)\n",
2996                         __FILE__,__LINE__,info->device_name,enable);
2997
2998         spin_lock_irqsave(&info->lock,flags);
2999         if ( enable ) {
3000                 if ( !info->rx_enabled )
3001                         rx_start(info);
3002         } else {
3003                 if ( info->rx_enabled )
3004                         rx_stop(info);
3005         }
3006         spin_unlock_irqrestore(&info->lock,flags);
3007         return 0;
3008 }
3009
3010 /* wait for specified event to occur
3011  */
3012 static int wait_mgsl_event(SLMP_INFO * info, int __user *mask_ptr)
3013 {
3014         unsigned long flags;
3015         int s;
3016         int rc=0;
3017         struct mgsl_icount cprev, cnow;
3018         int events;
3019         int mask;
3020         struct  _input_signal_events oldsigs, newsigs;
3021         DECLARE_WAITQUEUE(wait, current);
3022
3023         COPY_FROM_USER(rc,&mask, mask_ptr, sizeof(int));
3024         if (rc) {
3025                 return  -EFAULT;
3026         }
3027
3028         if (debug_level >= DEBUG_LEVEL_INFO)
3029                 printk("%s(%d):%s wait_mgsl_event(%d)\n",
3030                         __FILE__,__LINE__,info->device_name,mask);
3031
3032         spin_lock_irqsave(&info->lock,flags);
3033
3034         /* return immediately if state matches requested events */
3035         get_signals(info);
3036         s = info->serial_signals;
3037
3038         events = mask &
3039                 ( ((s & SerialSignal_DSR) ? MgslEvent_DsrActive:MgslEvent_DsrInactive) +
3040                   ((s & SerialSignal_DCD) ? MgslEvent_DcdActive:MgslEvent_DcdInactive) +
3041                   ((s & SerialSignal_CTS) ? MgslEvent_CtsActive:MgslEvent_CtsInactive) +
3042                   ((s & SerialSignal_RI)  ? MgslEvent_RiActive :MgslEvent_RiInactive) );
3043         if (events) {
3044                 spin_unlock_irqrestore(&info->lock,flags);
3045                 goto exit;
3046         }
3047
3048         /* save current irq counts */
3049         cprev = info->icount;
3050         oldsigs = info->input_signal_events;
3051
3052         /* enable hunt and idle irqs if needed */
3053         if (mask & (MgslEvent_ExitHuntMode+MgslEvent_IdleReceived)) {
3054                 unsigned char oldval = info->ie1_value;
3055                 unsigned char newval = oldval +
3056                          (mask & MgslEvent_ExitHuntMode ? FLGD:0) +
3057                          (mask & MgslEvent_IdleReceived ? IDLD:0);
3058                 if ( oldval != newval ) {
3059                         info->ie1_value = newval;
3060                         write_reg(info, IE1, info->ie1_value);
3061                 }
3062         }
3063
3064         set_current_state(TASK_INTERRUPTIBLE);
3065         add_wait_queue(&info->event_wait_q, &wait);
3066
3067         spin_unlock_irqrestore(&info->lock,flags);
3068
3069         for(;;) {
3070                 schedule();
3071                 if (signal_pending(current)) {
3072                         rc = -ERESTARTSYS;
3073                         break;
3074                 }
3075
3076                 /* get current irq counts */
3077                 spin_lock_irqsave(&info->lock,flags);
3078                 cnow = info->icount;
3079                 newsigs = info->input_signal_events;
3080                 set_current_state(TASK_INTERRUPTIBLE);
3081                 spin_unlock_irqrestore(&info->lock,flags);
3082
3083                 /* if no change, wait aborted for some reason */
3084                 if (newsigs.dsr_up   == oldsigs.dsr_up   &&
3085                     newsigs.dsr_down == oldsigs.dsr_down &&
3086                     newsigs.dcd_up   == oldsigs.dcd_up   &&
3087                     newsigs.dcd_down == oldsigs.dcd_down &&
3088                     newsigs.cts_up   == oldsigs.cts_up   &&
3089                     newsigs.cts_down == oldsigs.cts_down &&
3090                     newsigs.ri_up    == oldsigs.ri_up    &&
3091                     newsigs.ri_down  == oldsigs.ri_down  &&
3092                     cnow.exithunt    == cprev.exithunt   &&
3093                     cnow.rxidle      == cprev.rxidle) {
3094                         rc = -EIO;
3095                         break;
3096                 }
3097
3098                 events = mask &
3099                         ( (newsigs.dsr_up   != oldsigs.dsr_up   ? MgslEvent_DsrActive:0)   +
3100                           (newsigs.dsr_down != oldsigs.dsr_down ? MgslEvent_DsrInactive:0) +
3101                           (newsigs.dcd_up   != oldsigs.dcd_up   ? MgslEvent_DcdActive:0)   +
3102                           (newsigs.dcd_down != oldsigs.dcd_down ? MgslEvent_DcdInactive:0) +
3103                           (newsigs.cts_up   != oldsigs.cts_up   ? MgslEvent_CtsActive:0)   +
3104                           (newsigs.cts_down != oldsigs.cts_down ? MgslEvent_CtsInactive:0) +
3105                           (newsigs.ri_up    != oldsigs.ri_up    ? MgslEvent_RiActive:0)    +
3106                           (newsigs.ri_down  != oldsigs.ri_down  ? MgslEvent_RiInactive:0)  +
3107                           (cnow.exithunt    != cprev.exithunt   ? MgslEvent_ExitHuntMode:0) +
3108                           (cnow.rxidle      != cprev.rxidle     ? MgslEvent_IdleReceived:0) );
3109                 if (events)
3110                         break;
3111
3112                 cprev = cnow;
3113                 oldsigs = newsigs;
3114         }
3115
3116         remove_wait_queue(&info->event_wait_q, &wait);
3117         set_current_state(TASK_RUNNING);
3118
3119
3120         if (mask & (MgslEvent_ExitHuntMode + MgslEvent_IdleReceived)) {
3121                 spin_lock_irqsave(&info->lock,flags);
3122                 if (!waitqueue_active(&info->event_wait_q)) {
3123                         /* disable enable exit hunt mode/idle rcvd IRQs */
3124                         info->ie1_value &= ~(FLGD|IDLD);
3125                         write_reg(info, IE1, info->ie1_value);
3126                 }
3127                 spin_unlock_irqrestore(&info->lock,flags);
3128         }
3129 exit:
3130         if ( rc == 0 )
3131                 PUT_USER(rc, events, mask_ptr);
3132
3133         return rc;
3134 }
3135
3136 static int modem_input_wait(SLMP_INFO *info,int arg)
3137 {
3138         unsigned long flags;
3139         int rc;
3140         struct mgsl_icount cprev, cnow;
3141         DECLARE_WAITQUEUE(wait, current);
3142
3143         /* save current irq counts */
3144         spin_lock_irqsave(&info->lock,flags);
3145         cprev = info->icount;
3146         add_wait_queue(&info->status_event_wait_q, &wait);
3147         set_current_state(TASK_INTERRUPTIBLE);
3148         spin_unlock_irqrestore(&info->lock,flags);
3149
3150         for(;;) {
3151                 schedule();
3152                 if (signal_pending(current)) {
3153                         rc = -ERESTARTSYS;
3154                         break;
3155                 }
3156
3157                 /* get new irq counts */
3158                 spin_lock_irqsave(&info->lock,flags);
3159                 cnow = info->icount;
3160                 set_current_state(TASK_INTERRUPTIBLE);
3161                 spin_unlock_irqrestore(&info->lock,flags);
3162
3163                 /* if no change, wait aborted for some reason */
3164                 if (cnow.rng == cprev.rng && cnow.dsr == cprev.dsr &&
3165                     cnow.dcd == cprev.dcd && cnow.cts == cprev.cts) {
3166                         rc = -EIO;
3167                         break;
3168                 }
3169
3170                 /* check for change in caller specified modem input */
3171                 if ((arg & TIOCM_RNG && cnow.rng != cprev.rng) ||
3172                     (arg & TIOCM_DSR && cnow.dsr != cprev.dsr) ||
3173                     (arg & TIOCM_CD  && cnow.dcd != cprev.dcd) ||
3174                     (arg & TIOCM_CTS && cnow.cts != cprev.cts)) {
3175                         rc = 0;
3176                         break;
3177                 }
3178
3179                 cprev = cnow;
3180         }
3181         remove_wait_queue(&info->status_event_wait_q, &wait);
3182         set_current_state(TASK_RUNNING);
3183         return rc;
3184 }
3185
3186 /* return the state of the serial control and status signals
3187  */
3188 static int tiocmget(struct tty_struct *tty)
3189 {
3190         SLMP_INFO *info = tty->driver_data;
3191         unsigned int result;
3192         unsigned long flags;
3193
3194         spin_lock_irqsave(&info->lock,flags);
3195         get_signals(info);
3196         spin_unlock_irqrestore(&info->lock,flags);
3197
3198         result = ((info->serial_signals & SerialSignal_RTS) ? TIOCM_RTS : 0) |
3199                  ((info->serial_signals & SerialSignal_DTR) ? TIOCM_DTR : 0) |
3200                  ((info->serial_signals & SerialSignal_DCD) ? TIOCM_CAR : 0) |
3201                  ((info->serial_signals & SerialSignal_RI)  ? TIOCM_RNG : 0) |
3202                  ((info->serial_signals & SerialSignal_DSR) ? TIOCM_DSR : 0) |
3203                  ((info->serial_signals & SerialSignal_CTS) ? TIOCM_CTS : 0);
3204
3205         if (debug_level >= DEBUG_LEVEL_INFO)
3206                 printk("%s(%d):%s tiocmget() value=%08X\n",
3207                          __FILE__,__LINE__, info->device_name, result );
3208         return result;
3209 }
3210
3211 /* set modem control signals (DTR/RTS)
3212  */
3213 static int tiocmset(struct tty_struct *tty,
3214                                         unsigned int set, unsigned int clear)
3215 {
3216         SLMP_INFO *info = tty->driver_data;
3217         unsigned long flags;
3218
3219         if (debug_level >= DEBUG_LEVEL_INFO)
3220                 printk("%s(%d):%s tiocmset(%x,%x)\n",
3221                         __FILE__,__LINE__,info->device_name, set, clear);
3222
3223         if (set & TIOCM_RTS)
3224                 info->serial_signals |= SerialSignal_RTS;
3225         if (set & TIOCM_DTR)
3226                 info->serial_signals |= SerialSignal_DTR;
3227         if (clear & TIOCM_RTS)
3228                 info->serial_signals &= ~SerialSignal_RTS;
3229         if (clear & TIOCM_DTR)
3230                 info->serial_signals &= ~SerialSignal_DTR;
3231
3232         spin_lock_irqsave(&info->lock,flags);
3233         set_signals(info);
3234         spin_unlock_irqrestore(&info->lock,flags);
3235
3236         return 0;
3237 }
3238
3239 static int carrier_raised(struct tty_port *port)
3240 {
3241         SLMP_INFO *info = container_of(port, SLMP_INFO, port);
3242         unsigned long flags;
3243
3244         spin_lock_irqsave(&info->lock,flags);
3245         get_signals(info);
3246         spin_unlock_irqrestore(&info->lock,flags);
3247
3248         return (info->serial_signals & SerialSignal_DCD) ? 1 : 0;
3249 }
3250
3251 static void dtr_rts(struct tty_port *port, int on)
3252 {
3253         SLMP_INFO *info = container_of(port, SLMP_INFO, port);
3254         unsigned long flags;
3255
3256         spin_lock_irqsave(&info->lock,flags);
3257         if (on)
3258                 info->serial_signals |= SerialSignal_RTS | SerialSignal_DTR;
3259         else
3260                 info->serial_signals &= ~(SerialSignal_RTS | SerialSignal_DTR);
3261         set_signals(info);
3262         spin_unlock_irqrestore(&info->lock,flags);
3263 }
3264
3265 /* Block the current process until the specified port is ready to open.
3266  */
3267 static int block_til_ready(struct tty_struct *tty, struct file *filp,
3268                            SLMP_INFO *info)
3269 {
3270         DECLARE_WAITQUEUE(wait, current);
3271         int             retval;
3272         bool            do_clocal = false;
3273         unsigned long   flags;
3274         int             cd;
3275         struct tty_port *port = &info->port;
3276
3277         if (debug_level >= DEBUG_LEVEL_INFO)
3278                 printk("%s(%d):%s block_til_ready()\n",
3279                          __FILE__,__LINE__, tty->driver->name );
3280
3281         if (filp->f_flags & O_NONBLOCK || tty_io_error(tty)) {
3282                 /* nonblock mode is set or port is not enabled */
3283                 /* just verify that callout device is not active */
3284                 tty_port_set_active(port, 1);
3285                 return 0;
3286         }
3287
3288         if (C_CLOCAL(tty))
3289                 do_clocal = true;
3290
3291         /* Wait for carrier detect and the line to become
3292          * free (i.e., not in use by the callout).  While we are in
3293          * this loop, port->count is dropped by one, so that
3294          * close() knows when to free things.  We restore it upon
3295          * exit, either normal or abnormal.
3296          */
3297
3298         retval = 0;
3299         add_wait_queue(&port->open_wait, &wait);
3300
3301         if (debug_level >= DEBUG_LEVEL_INFO)
3302                 printk("%s(%d):%s block_til_ready() before block, count=%d\n",
3303                          __FILE__,__LINE__, tty->driver->name, port->count );
3304
3305         spin_lock_irqsave(&info->lock, flags);
3306         port->count--;
3307         spin_unlock_irqrestore(&info->lock, flags);
3308         port->blocked_open++;
3309
3310         while (1) {
3311                 if (C_BAUD(tty) && tty_port_initialized(port))
3312                         tty_port_raise_dtr_rts(port);
3313
3314                 set_current_state(TASK_INTERRUPTIBLE);
3315
3316                 if (tty_hung_up_p(filp) || !tty_port_initialized(port)) {
3317                         retval = (port->flags & ASYNC_HUP_NOTIFY) ?
3318                                         -EAGAIN : -ERESTARTSYS;
3319                         break;
3320                 }
3321
3322                 cd = tty_port_carrier_raised(port);
3323                 if (do_clocal || cd)
3324                         break;
3325
3326                 if (signal_pending(current)) {
3327                         retval = -ERESTARTSYS;
3328                         break;
3329                 }
3330
3331                 if (debug_level >= DEBUG_LEVEL_INFO)
3332                         printk("%s(%d):%s block_til_ready() count=%d\n",
3333                                  __FILE__,__LINE__, tty->driver->name, port->count );
3334
3335                 tty_unlock(tty);
3336                 schedule();
3337                 tty_lock(tty);
3338         }
3339
3340         set_current_state(TASK_RUNNING);
3341         remove_wait_queue(&port->open_wait, &wait);
3342         if (!tty_hung_up_p(filp))
3343                 port->count++;
3344         port->blocked_open--;
3345
3346         if (debug_level >= DEBUG_LEVEL_INFO)
3347                 printk("%s(%d):%s block_til_ready() after, count=%d\n",
3348                          __FILE__,__LINE__, tty->driver->name, port->count );
3349
3350         if (!retval)
3351                 tty_port_set_active(port, 1);
3352
3353         return retval;
3354 }
3355
3356 static int alloc_dma_bufs(SLMP_INFO *info)
3357 {
3358         unsigned short BuffersPerFrame;
3359         unsigned short BufferCount;
3360
3361         // Force allocation to start at 64K boundary for each port.
3362         // This is necessary because *all* buffer descriptors for a port
3363         // *must* be in the same 64K block. All descriptors on a port
3364         // share a common 'base' address (upper 8 bits of 24 bits) programmed
3365         // into the CBP register.
3366         info->port_array[0]->last_mem_alloc = (SCA_MEM_SIZE/4) * info->port_num;
3367
3368         /* Calculate the number of DMA buffers necessary to hold the */
3369         /* largest allowable frame size. Note: If the max frame size is */
3370         /* not an even multiple of the DMA buffer size then we need to */
3371         /* round the buffer count per frame up one. */
3372
3373         BuffersPerFrame = (unsigned short)(info->max_frame_size/SCABUFSIZE);
3374         if ( info->max_frame_size % SCABUFSIZE )
3375                 BuffersPerFrame++;
3376
3377         /* calculate total number of data buffers (SCABUFSIZE) possible
3378          * in one ports memory (SCA_MEM_SIZE/4) after allocating memory
3379          * for the descriptor list (BUFFERLISTSIZE).
3380          */
3381         BufferCount = (SCA_MEM_SIZE/4 - BUFFERLISTSIZE)/SCABUFSIZE;
3382
3383         /* limit number of buffers to maximum amount of descriptors */
3384         if (BufferCount > BUFFERLISTSIZE/sizeof(SCADESC))
3385                 BufferCount = BUFFERLISTSIZE/sizeof(SCADESC);
3386
3387         /* use enough buffers to transmit one max size frame */
3388         info->tx_buf_count = BuffersPerFrame + 1;
3389
3390         /* never use more than half the available buffers for transmit */
3391         if (info->tx_buf_count > (BufferCount/2))
3392                 info->tx_buf_count = BufferCount/2;
3393
3394         if (info->tx_buf_count > SCAMAXDESC)
3395                 info->tx_buf_count = SCAMAXDESC;
3396
3397         /* use remaining buffers for receive */
3398         info->rx_buf_count = BufferCount - info->tx_buf_count;
3399
3400         if (info->rx_buf_count > SCAMAXDESC)
3401                 info->rx_buf_count = SCAMAXDESC;
3402
3403         if ( debug_level >= DEBUG_LEVEL_INFO )
3404                 printk("%s(%d):%s Allocating %d TX and %d RX DMA buffers.\n",
3405                         __FILE__,__LINE__, info->device_name,
3406                         info->tx_buf_count,info->rx_buf_count);
3407
3408         if ( alloc_buf_list( info ) < 0 ||
3409                 alloc_frame_bufs(info,
3410                                         info->rx_buf_list,
3411                                         info->rx_buf_list_ex,
3412                                         info->rx_buf_count) < 0 ||
3413                 alloc_frame_bufs(info,
3414                                         info->tx_buf_list,
3415                                         info->tx_buf_list_ex,
3416                                         info->tx_buf_count) < 0 ||
3417                 alloc_tmp_rx_buf(info) < 0 ) {
3418                 printk("%s(%d):%s Can't allocate DMA buffer memory\n",
3419                         __FILE__,__LINE__, info->device_name);
3420                 return -ENOMEM;
3421         }
3422
3423         rx_reset_buffers( info );
3424
3425         return 0;
3426 }
3427
3428 /* Allocate DMA buffers for the transmit and receive descriptor lists.
3429  */
3430 static int alloc_buf_list(SLMP_INFO *info)
3431 {
3432         unsigned int i;
3433
3434         /* build list in adapter shared memory */
3435         info->buffer_list = info->memory_base + info->port_array[0]->last_mem_alloc;
3436         info->buffer_list_phys = info->port_array[0]->last_mem_alloc;
3437         info->port_array[0]->last_mem_alloc += BUFFERLISTSIZE;
3438
3439         memset(info->buffer_list, 0, BUFFERLISTSIZE);
3440
3441         /* Save virtual address pointers to the receive and */
3442         /* transmit buffer lists. (Receive 1st). These pointers will */
3443         /* be used by the processor to access the lists. */
3444         info->rx_buf_list = (SCADESC *)info->buffer_list;
3445
3446         info->tx_buf_list = (SCADESC *)info->buffer_list;
3447         info->tx_buf_list += info->rx_buf_count;
3448
3449         /* Build links for circular buffer entry lists (tx and rx)
3450          *
3451          * Note: links are physical addresses read by the SCA device
3452          * to determine the next buffer entry to use.
3453          */
3454
3455         for ( i = 0; i < info->rx_buf_count; i++ ) {
3456                 /* calculate and store physical address of this buffer entry */
3457                 info->rx_buf_list_ex[i].phys_entry =
3458                         info->buffer_list_phys + (i * SCABUFSIZE);
3459
3460                 /* calculate and store physical address of */
3461                 /* next entry in cirular list of entries */
3462                 info->rx_buf_list[i].next = info->buffer_list_phys;
3463                 if ( i < info->rx_buf_count - 1 )
3464                         info->rx_buf_list[i].next += (i + 1) * sizeof(SCADESC);
3465
3466                 info->rx_buf_list[i].length = SCABUFSIZE;
3467         }
3468
3469         for ( i = 0; i < info->tx_buf_count; i++ ) {
3470                 /* calculate and store physical address of this buffer entry */
3471                 info->tx_buf_list_ex[i].phys_entry = info->buffer_list_phys +
3472                         ((info->rx_buf_count + i) * sizeof(SCADESC));
3473
3474                 /* calculate and store physical address of */
3475                 /* next entry in cirular list of entries */
3476
3477                 info->tx_buf_list[i].next = info->buffer_list_phys +
3478                         info->rx_buf_count * sizeof(SCADESC);
3479
3480                 if ( i < info->tx_buf_count - 1 )
3481                         info->tx_buf_list[i].next += (i + 1) * sizeof(SCADESC);
3482         }
3483
3484         return 0;
3485 }
3486
3487 /* Allocate the frame DMA buffers used by the specified buffer list.
3488  */
3489 static int alloc_frame_bufs(SLMP_INFO *info, SCADESC *buf_list,SCADESC_EX *buf_list_ex,int count)
3490 {
3491         int i;
3492         unsigned long phys_addr;
3493
3494         for ( i = 0; i < count; i++ ) {
3495                 buf_list_ex[i].virt_addr = info->memory_base + info->port_array[0]->last_mem_alloc;
3496                 phys_addr = info->port_array[0]->last_mem_alloc;
3497                 info->port_array[0]->last_mem_alloc += SCABUFSIZE;
3498
3499                 buf_list[i].buf_ptr  = (unsigned short)phys_addr;
3500                 buf_list[i].buf_base = (unsigned char)(phys_addr >> 16);
3501         }
3502
3503         return 0;
3504 }
3505
3506 static void free_dma_bufs(SLMP_INFO *info)
3507 {
3508         info->buffer_list = NULL;
3509         info->rx_buf_list = NULL;
3510         info->tx_buf_list = NULL;
3511 }
3512
3513 /* allocate buffer large enough to hold max_frame_size.
3514  * This buffer is used to pass an assembled frame to the line discipline.
3515  */
3516 static int alloc_tmp_rx_buf(SLMP_INFO *info)
3517 {
3518         info->tmp_rx_buf = kmalloc(info->max_frame_size, GFP_KERNEL);
3519         if (info->tmp_rx_buf == NULL)
3520                 return -ENOMEM;
3521         /* unused flag buffer to satisfy receive_buf calling interface */
3522         info->flag_buf = kzalloc(info->max_frame_size, GFP_KERNEL);
3523         if (!info->flag_buf) {
3524                 kfree(info->tmp_rx_buf);
3525                 info->tmp_rx_buf = NULL;
3526                 return -ENOMEM;
3527         }
3528         return 0;
3529 }
3530
3531 static void free_tmp_rx_buf(SLMP_INFO *info)
3532 {
3533         kfree(info->tmp_rx_buf);
3534         info->tmp_rx_buf = NULL;
3535         kfree(info->flag_buf);
3536         info->flag_buf = NULL;
3537 }
3538
3539 static int claim_resources(SLMP_INFO *info)
3540 {
3541         if (request_mem_region(info->phys_memory_base,SCA_MEM_SIZE,"synclinkmp") == NULL) {
3542                 printk( "%s(%d):%s mem addr conflict, Addr=%08X\n",
3543                         __FILE__,__LINE__,info->device_name, info->phys_memory_base);
3544                 info->init_error = DiagStatus_AddressConflict;
3545                 goto errout;
3546         }
3547         else
3548                 info->shared_mem_requested = true;
3549
3550         if (request_mem_region(info->phys_lcr_base + info->lcr_offset,128,"synclinkmp") == NULL) {
3551                 printk( "%s(%d):%s lcr mem addr conflict, Addr=%08X\n",
3552                         __FILE__,__LINE__,info->device_name, info->phys_lcr_base);
3553                 info->init_error = DiagStatus_AddressConflict;
3554                 goto errout;
3555         }
3556         else
3557                 info->lcr_mem_requested = true;
3558
3559         if (request_mem_region(info->phys_sca_base + info->sca_offset,SCA_BASE_SIZE,"synclinkmp") == NULL) {
3560                 printk( "%s(%d):%s sca mem addr conflict, Addr=%08X\n",
3561                         __FILE__,__LINE__,info->device_name, info->phys_sca_base);
3562                 info->init_error = DiagStatus_AddressConflict;
3563                 goto errout;
3564         }
3565         else
3566                 info->sca_base_requested = true;
3567
3568         if (request_mem_region(info->phys_statctrl_base + info->statctrl_offset,SCA_REG_SIZE,"synclinkmp") == NULL) {
3569                 printk( "%s(%d):%s stat/ctrl mem addr conflict, Addr=%08X\n",
3570                         __FILE__,__LINE__,info->device_name, info->phys_statctrl_base);
3571                 info->init_error = DiagStatus_AddressConflict;
3572                 goto errout;
3573         }
3574         else
3575                 info->sca_statctrl_requested = true;
3576
3577         info->memory_base = ioremap_nocache(info->phys_memory_base,
3578                                                                 SCA_MEM_SIZE);
3579         if (!info->memory_base) {
3580                 printk( "%s(%d):%s Can't map shared memory, MemAddr=%08X\n",
3581                         __FILE__,__LINE__,info->device_name, info->phys_memory_base );
3582                 info->init_error = DiagStatus_CantAssignPciResources;
3583                 goto errout;
3584         }
3585
3586         info->lcr_base = ioremap_nocache(info->phys_lcr_base, PAGE_SIZE);
3587         if (!info->lcr_base) {
3588                 printk( "%s(%d):%s Can't map LCR memory, MemAddr=%08X\n",
3589                         __FILE__,__LINE__,info->device_name, info->phys_lcr_base );
3590                 info->init_error = DiagStatus_CantAssignPciResources;
3591                 goto errout;
3592         }
3593         info->lcr_base += info->lcr_offset;
3594
3595         info->sca_base = ioremap_nocache(info->phys_sca_base, PAGE_SIZE);
3596         if (!info->sca_base) {
3597                 printk( "%s(%d):%s Can't map SCA memory, MemAddr=%08X\n",
3598                         __FILE__,__LINE__,info->device_name, info->phys_sca_base );
3599                 info->init_error = DiagStatus_CantAssignPciResources;
3600                 goto errout;
3601         }
3602         info->sca_base += info->sca_offset;
3603
3604         info->statctrl_base = ioremap_nocache(info->phys_statctrl_base,
3605                                                                 PAGE_SIZE);
3606         if (!info->statctrl_base) {
3607                 printk( "%s(%d):%s Can't map SCA Status/Control memory, MemAddr=%08X\n",
3608                         __FILE__,__LINE__,info->device_name, info->phys_statctrl_base );
3609                 info->init_error = DiagStatus_CantAssignPciResources;
3610                 goto errout;
3611         }
3612         info->statctrl_base += info->statctrl_offset;
3613
3614         if ( !memory_test(info) ) {
3615                 printk( "%s(%d):Shared Memory Test failed for device %s MemAddr=%08X\n",
3616                         __FILE__,__LINE__,info->device_name, info->phys_memory_base );
3617                 info->init_error = DiagStatus_MemoryError;
3618                 goto errout;
3619         }
3620
3621         return 0;
3622
3623 errout:
3624         release_resources( info );
3625         return -ENODEV;
3626 }
3627
3628 static void release_resources(SLMP_INFO *info)
3629 {
3630         if ( debug_level >= DEBUG_LEVEL_INFO )
3631                 printk( "%s(%d):%s release_resources() entry\n",
3632                         __FILE__,__LINE__,info->device_name );
3633
3634         if ( info->irq_requested ) {
3635                 free_irq(info->irq_level, info);
3636                 info->irq_requested = false;
3637         }
3638
3639         if ( info->shared_mem_requested ) {
3640                 release_mem_region(info->phys_memory_base,SCA_MEM_SIZE);
3641                 info->shared_mem_requested = false;
3642         }
3643         if ( info->lcr_mem_requested ) {
3644                 release_mem_region(info->phys_lcr_base + info->lcr_offset,128);
3645                 info->lcr_mem_requested = false;
3646         }
3647         if ( info->sca_base_requested ) {
3648                 release_mem_region(info->phys_sca_base + info->sca_offset,SCA_BASE_SIZE);
3649                 info->sca_base_requested = false;
3650         }
3651         if ( info->sca_statctrl_requested ) {
3652                 release_mem_region(info->phys_statctrl_base + info->statctrl_offset,SCA_REG_SIZE);
3653                 info->sca_statctrl_requested = false;
3654         }
3655
3656         if (info->memory_base){
3657                 iounmap(info->memory_base);
3658                 info->memory_base = NULL;
3659         }
3660
3661         if (info->sca_base) {
3662                 iounmap(info->sca_base - info->sca_offset);
3663                 info->sca_base=NULL;
3664         }
3665
3666         if (info->statctrl_base) {
3667                 iounmap(info->statctrl_base - info->statctrl_offset);
3668                 info->statctrl_base=NULL;
3669         }
3670
3671         if (info->lcr_base){
3672                 iounmap(info->lcr_base - info->lcr_offset);
3673                 info->lcr_base = NULL;
3674         }
3675
3676         if ( debug_level >= DEBUG_LEVEL_INFO )
3677                 printk( "%s(%d):%s release_resources() exit\n",
3678                         __FILE__,__LINE__,info->device_name );
3679 }
3680
3681 /* Add the specified device instance data structure to the
3682  * global linked list of devices and increment the device count.
3683  */
3684 static int add_device(SLMP_INFO *info)
3685 {
3686         info->next_device = NULL;
3687         info->line = synclinkmp_device_count;
3688         sprintf(info->device_name,"ttySLM%dp%d",info->adapter_num,info->port_num);
3689
3690         if (info->line < MAX_DEVICES) {
3691                 if (maxframe[info->line])
3692                         info->max_frame_size = maxframe[info->line];
3693         }
3694
3695         synclinkmp_device_count++;
3696
3697         if ( !synclinkmp_device_list )
3698                 synclinkmp_device_list = info;
3699         else {
3700                 SLMP_INFO *current_dev = synclinkmp_device_list;
3701                 while( current_dev->next_device )
3702                         current_dev = current_dev->next_device;
3703                 current_dev->next_device = info;
3704         }
3705
3706         if ( info->max_frame_size < 4096 )
3707                 info->max_frame_size = 4096;
3708         else if ( info->max_frame_size > 65535 )
3709                 info->max_frame_size = 65535;
3710
3711         printk( "SyncLink MultiPort %s: "
3712                 "Mem=(%08x %08X %08x %08X) IRQ=%d MaxFrameSize=%u\n",
3713                 info->device_name,
3714                 info->phys_sca_base,
3715                 info->phys_memory_base,
3716                 info->phys_statctrl_base,
3717                 info->phys_lcr_base,
3718                 info->irq_level,
3719                 info->max_frame_size );
3720
3721 #if SYNCLINK_GENERIC_HDLC
3722         return hdlcdev_init(info);
3723 #else
3724         return 0;
3725 #endif
3726 }
3727
3728 static const struct tty_port_operations port_ops = {
3729         .carrier_raised = carrier_raised,
3730         .dtr_rts = dtr_rts,
3731 };
3732
3733 /* Allocate and initialize a device instance structure
3734  *
3735  * Return Value:        pointer to SLMP_INFO if success, otherwise NULL
3736  */
3737 static SLMP_INFO *alloc_dev(int adapter_num, int port_num, struct pci_dev *pdev)
3738 {
3739         SLMP_INFO *info;
3740
3741         info = kzalloc(sizeof(SLMP_INFO),
3742                  GFP_KERNEL);
3743
3744         if (!info) {
3745                 printk("%s(%d) Error can't allocate device instance data for adapter %d, port %d\n",
3746                         __FILE__,__LINE__, adapter_num, port_num);
3747         } else {
3748                 tty_port_init(&info->port);
3749                 info->port.ops = &port_ops;
3750                 info->magic = MGSL_MAGIC;
3751                 INIT_WORK(&info->task, bh_handler);
3752                 info->max_frame_size = 4096;
3753                 info->port.close_delay = 5*HZ/10;
3754                 info->port.closing_wait = 30*HZ;
3755                 init_waitqueue_head(&info->status_event_wait_q);
3756                 init_waitqueue_head(&info->event_wait_q);
3757                 spin_lock_init(&info->netlock);
3758                 memcpy(&info->params,&default_params,sizeof(MGSL_PARAMS));
3759                 info->idle_mode = HDLC_TXIDLE_FLAGS;
3760                 info->adapter_num = adapter_num;
3761                 info->port_num = port_num;
3762
3763                 /* Copy configuration info to device instance data */
3764                 info->irq_level = pdev->irq;
3765                 info->phys_lcr_base = pci_resource_start(pdev,0);
3766                 info->phys_sca_base = pci_resource_start(pdev,2);
3767                 info->phys_memory_base = pci_resource_start(pdev,3);
3768                 info->phys_statctrl_base = pci_resource_start(pdev,4);
3769
3770                 /* Because veremap only works on page boundaries we must map
3771                  * a larger area than is actually implemented for the LCR
3772                  * memory range. We map a full page starting at the page boundary.
3773                  */
3774                 info->lcr_offset    = info->phys_lcr_base & (PAGE_SIZE-1);
3775                 info->phys_lcr_base &= ~(PAGE_SIZE-1);
3776
3777                 info->sca_offset    = info->phys_sca_base & (PAGE_SIZE-1);
3778                 info->phys_sca_base &= ~(PAGE_SIZE-1);
3779
3780                 info->statctrl_offset    = info->phys_statctrl_base & (PAGE_SIZE-1);
3781                 info->phys_statctrl_base &= ~(PAGE_SIZE-1);
3782
3783                 info->bus_type = MGSL_BUS_TYPE_PCI;
3784                 info->irq_flags = IRQF_SHARED;
3785
3786                 setup_timer(&info->tx_timer, tx_timeout, (unsigned long)info);
3787                 setup_timer(&info->status_timer, status_timeout,
3788                                 (unsigned long)info);
3789
3790                 /* Store the PCI9050 misc control register value because a flaw
3791                  * in the PCI9050 prevents LCR registers from being read if
3792                  * BIOS assigns an LCR base address with bit 7 set.
3793                  *
3794                  * Only the misc control register is accessed for which only
3795                  * write access is needed, so set an initial value and change
3796                  * bits to the device instance data as we write the value
3797                  * to the actual misc control register.
3798                  */
3799                 info->misc_ctrl_value = 0x087e4546;
3800
3801                 /* initial port state is unknown - if startup errors
3802                  * occur, init_error will be set to indicate the
3803                  * problem. Once the port is fully initialized,
3804                  * this value will be set to 0 to indicate the
3805                  * port is available.
3806                  */
3807                 info->init_error = -1;
3808         }
3809
3810         return info;
3811 }
3812
3813 static int device_init(int adapter_num, struct pci_dev *pdev)
3814 {
3815         SLMP_INFO *port_array[SCA_MAX_PORTS];
3816         int port, rc;
3817
3818         /* allocate device instances for up to SCA_MAX_PORTS devices */
3819         for ( port = 0; port < SCA_MAX_PORTS; ++port ) {
3820                 port_array[port] = alloc_dev(adapter_num,port,pdev);
3821                 if( port_array[port] == NULL ) {
3822                         for (--port; port >= 0; --port) {
3823                                 tty_port_destroy(&port_array[port]->port);
3824                                 kfree(port_array[port]);
3825                         }
3826                         return -ENOMEM;
3827                 }
3828         }
3829
3830         /* give copy of port_array to all ports and add to device list  */
3831         for ( port = 0; port < SCA_MAX_PORTS; ++port ) {
3832                 memcpy(port_array[port]->port_array,port_array,sizeof(port_array));
3833                 rc = add_device( port_array[port] );
3834                 if (rc)
3835                         goto err_add;
3836                 spin_lock_init(&port_array[port]->lock);
3837         }
3838
3839         /* Allocate and claim adapter resources */
3840         if ( !claim_resources(port_array[0]) ) {
3841
3842                 alloc_dma_bufs(port_array[0]);
3843
3844                 /* copy resource information from first port to others */
3845                 for ( port = 1; port < SCA_MAX_PORTS; ++port ) {
3846                         port_array[port]->lock  = port_array[0]->lock;
3847                         port_array[port]->irq_level     = port_array[0]->irq_level;
3848                         port_array[port]->memory_base   = port_array[0]->memory_base;
3849                         port_array[port]->sca_base      = port_array[0]->sca_base;
3850                         port_array[port]->statctrl_base = port_array[0]->statctrl_base;
3851                         port_array[port]->lcr_base      = port_array[0]->lcr_base;
3852                         alloc_dma_bufs(port_array[port]);
3853                 }
3854
3855                 rc = request_irq(port_array[0]->irq_level,
3856                                         synclinkmp_interrupt,
3857                                         port_array[0]->irq_flags,
3858                                         port_array[0]->device_name,
3859                                         port_array[0]);
3860                 if ( rc ) {
3861                         printk( "%s(%d):%s Can't request interrupt, IRQ=%d\n",
3862                                 __FILE__,__LINE__,
3863                                 port_array[0]->device_name,
3864                                 port_array[0]->irq_level );
3865                         goto err_irq;
3866                 }
3867                 port_array[0]->irq_requested = true;
3868                 adapter_test(port_array[0]);
3869         }
3870         return 0;
3871 err_irq:
3872         release_resources( port_array[0] );
3873 err_add:
3874         for ( port = 0; port < SCA_MAX_PORTS; ++port ) {
3875                 tty_port_destroy(&port_array[port]->port);
3876                 kfree(port_array[port]);
3877         }
3878         return rc;
3879 }
3880
3881 static const struct tty_operations ops = {
3882         .install = install,
3883         .open = open,
3884         .close = close,
3885         .write = write,
3886         .put_char = put_char,
3887         .flush_chars = flush_chars,
3888         .write_room = write_room,
3889         .chars_in_buffer = chars_in_buffer,
3890         .flush_buffer = flush_buffer,
3891         .ioctl = ioctl,
3892         .throttle = throttle,
3893         .unthrottle = unthrottle,
3894         .send_xchar = send_xchar,
3895         .break_ctl = set_break,
3896         .wait_until_sent = wait_until_sent,
3897         .set_termios = set_termios,
3898         .stop = tx_hold,
3899         .start = tx_release,
3900         .hangup = hangup,
3901         .tiocmget = tiocmget,
3902         .tiocmset = tiocmset,
3903         .get_icount = get_icount,
3904         .proc_fops = &synclinkmp_proc_fops,
3905 };
3906
3907
3908 static void synclinkmp_cleanup(void)
3909 {
3910         int rc;
3911         SLMP_INFO *info;
3912         SLMP_INFO *tmp;
3913
3914         printk("Unloading %s %s\n", driver_name, driver_version);
3915
3916         if (serial_driver) {
3917                 rc = tty_unregister_driver(serial_driver);
3918                 if (rc)
3919                         printk("%s(%d) failed to unregister tty driver err=%d\n",
3920                                __FILE__,__LINE__,rc);
3921                 put_tty_driver(serial_driver);
3922         }
3923
3924         /* reset devices */
3925         info = synclinkmp_device_list;
3926         while(info) {
3927                 reset_port(info);
3928                 info = info->next_device;
3929         }
3930
3931         /* release devices */
3932         info = synclinkmp_device_list;
3933         while(info) {
3934 #if SYNCLINK_GENERIC_HDLC
3935                 hdlcdev_exit(info);
3936 #endif
3937                 free_dma_bufs(info);
3938                 free_tmp_rx_buf(info);
3939                 if ( info->port_num == 0 ) {
3940                         if (info->sca_base)
3941                                 write_reg(info, LPR, 1); /* set low power mode */
3942                         release_resources(info);
3943                 }
3944                 tmp = info;
3945                 info = info->next_device;
3946                 tty_port_destroy(&tmp->port);
3947                 kfree(tmp);
3948         }
3949
3950         pci_unregister_driver(&synclinkmp_pci_driver);
3951 }
3952
3953 /* Driver initialization entry point.
3954  */
3955
3956 static int __init synclinkmp_init(void)
3957 {
3958         int rc;
3959
3960         if (break_on_load) {
3961                 synclinkmp_get_text_ptr();
3962                 BREAKPOINT();
3963         }
3964
3965         printk("%s %s\n", driver_name, driver_version);
3966
3967         if ((rc = pci_register_driver(&synclinkmp_pci_driver)) < 0) {
3968                 printk("%s:failed to register PCI driver, error=%d\n",__FILE__,rc);
3969                 return rc;
3970         }
3971
3972         serial_driver = alloc_tty_driver(128);
3973         if (!serial_driver) {
3974                 rc = -ENOMEM;
3975                 goto error;
3976         }
3977
3978         /* Initialize the tty_driver structure */
3979
3980         serial_driver->driver_name = "synclinkmp";
3981         serial_driver->name = "ttySLM";
3982         serial_driver->major = ttymajor;
3983         serial_driver->minor_start = 64;
3984         serial_driver->type = TTY_DRIVER_TYPE_SERIAL;
3985         serial_driver->subtype = SERIAL_TYPE_NORMAL;
3986         serial_driver->init_termios = tty_std_termios;
3987         serial_driver->init_termios.c_cflag =
3988                 B9600 | CS8 | CREAD | HUPCL | CLOCAL;
3989         serial_driver->init_termios.c_ispeed = 9600;
3990         serial_driver->init_termios.c_ospeed = 9600;
3991         serial_driver->flags = TTY_DRIVER_REAL_RAW;
3992         tty_set_operations(serial_driver, &ops);
3993         if ((rc = tty_register_driver(serial_driver)) < 0) {
3994                 printk("%s(%d):Couldn't register serial driver\n",
3995                         __FILE__,__LINE__);
3996                 put_tty_driver(serial_driver);
3997                 serial_driver = NULL;
3998                 goto error;
3999         }
4000
4001         printk("%s %s, tty major#%d\n",
4002                 driver_name, driver_version,
4003                 serial_driver->major);
4004
4005         return 0;
4006
4007 error:
4008         synclinkmp_cleanup();
4009         return rc;
4010 }
4011
4012 static void __exit synclinkmp_exit(void)
4013 {
4014         synclinkmp_cleanup();
4015 }
4016
4017 module_init(synclinkmp_init);
4018 module_exit(synclinkmp_exit);
4019
4020 /* Set the port for internal loopback mode.
4021  * The TxCLK and RxCLK signals are generated from the BRG and
4022  * the TxD is looped back to the RxD internally.
4023  */
4024 static void enable_loopback(SLMP_INFO *info, int enable)
4025 {
4026         if (enable) {
4027                 /* MD2 (Mode Register 2)
4028                  * 01..00  CNCT<1..0> Channel Connection 11=Local Loopback
4029                  */
4030                 write_reg(info, MD2, (unsigned char)(read_reg(info, MD2) | (BIT1 + BIT0)));
4031
4032                 /* degate external TxC clock source */
4033                 info->port_array[0]->ctrlreg_value |= (BIT0 << (info->port_num * 2));
4034                 write_control_reg(info);
4035
4036                 /* RXS/TXS (Rx/Tx clock source)
4037                  * 07      Reserved, must be 0
4038                  * 06..04  Clock Source, 100=BRG
4039                  * 03..00  Clock Divisor, 0000=1
4040                  */
4041                 write_reg(info, RXS, 0x40);
4042                 write_reg(info, TXS, 0x40);
4043
4044         } else {
4045                 /* MD2 (Mode Register 2)
4046                  * 01..00  CNCT<1..0> Channel connection, 0=normal
4047                  */
4048                 write_reg(info, MD2, (unsigned char)(read_reg(info, MD2) & ~(BIT1 + BIT0)));
4049
4050                 /* RXS/TXS (Rx/Tx clock source)
4051                  * 07      Reserved, must be 0
4052                  * 06..04  Clock Source, 000=RxC/TxC Pin
4053                  * 03..00  Clock Divisor, 0000=1
4054                  */
4055                 write_reg(info, RXS, 0x00);
4056                 write_reg(info, TXS, 0x00);
4057         }
4058
4059         /* set LinkSpeed if available, otherwise default to 2Mbps */
4060         if (info->params.clock_speed)
4061                 set_rate(info, info->params.clock_speed);
4062         else
4063                 set_rate(info, 3686400);
4064 }
4065
4066 /* Set the baud rate register to the desired speed
4067  *
4068  *      data_rate       data rate of clock in bits per second
4069  *                      A data rate of 0 disables the AUX clock.
4070  */
4071 static void set_rate( SLMP_INFO *info, u32 data_rate )
4072 {
4073         u32 TMCValue;
4074         unsigned char BRValue;
4075         u32 Divisor=0;
4076
4077         /* fBRG = fCLK/(TMC * 2^BR)
4078          */
4079         if (data_rate != 0) {
4080                 Divisor = 14745600/data_rate;
4081                 if (!Divisor)
4082                         Divisor = 1;
4083
4084                 TMCValue = Divisor;
4085
4086                 BRValue = 0;
4087                 if (TMCValue != 1 && TMCValue != 2) {
4088                         /* BRValue of 0 provides 50/50 duty cycle *only* when
4089                          * TMCValue is 1 or 2. BRValue of 1 to 9 always provides
4090                          * 50/50 duty cycle.
4091                          */
4092                         BRValue = 1;
4093                         TMCValue >>= 1;
4094                 }
4095
4096                 /* while TMCValue is too big for TMC register, divide
4097                  * by 2 and increment BR exponent.
4098                  */
4099                 for(; TMCValue > 256 && BRValue < 10; BRValue++)
4100                         TMCValue >>= 1;
4101
4102                 write_reg(info, TXS,
4103                         (unsigned char)((read_reg(info, TXS) & 0xf0) | BRValue));
4104                 write_reg(info, RXS,
4105                         (unsigned char)((read_reg(info, RXS) & 0xf0) | BRValue));
4106                 write_reg(info, TMC, (unsigned char)TMCValue);
4107         }
4108         else {
4109                 write_reg(info, TXS,0);
4110                 write_reg(info, RXS,0);
4111                 write_reg(info, TMC, 0);
4112         }
4113 }
4114
4115 /* Disable receiver
4116  */
4117 static void rx_stop(SLMP_INFO *info)
4118 {
4119         if (debug_level >= DEBUG_LEVEL_ISR)
4120                 printk("%s(%d):%s rx_stop()\n",
4121                          __FILE__,__LINE__, info->device_name );
4122
4123         write_reg(info, CMD, RXRESET);
4124
4125         info->ie0_value &= ~RXRDYE;
4126         write_reg(info, IE0, info->ie0_value);  /* disable Rx data interrupts */
4127
4128         write_reg(info, RXDMA + DSR, 0);        /* disable Rx DMA */
4129         write_reg(info, RXDMA + DCMD, SWABORT); /* reset/init Rx DMA */
4130         write_reg(info, RXDMA + DIR, 0);        /* disable Rx DMA interrupts */
4131
4132         info->rx_enabled = false;
4133         info->rx_overflow = false;
4134 }
4135
4136 /* enable the receiver
4137  */
4138 static void rx_start(SLMP_INFO *info)
4139 {
4140         int i;
4141
4142         if (debug_level >= DEBUG_LEVEL_ISR)
4143                 printk("%s(%d):%s rx_start()\n",
4144                          __FILE__,__LINE__, info->device_name );
4145
4146         write_reg(info, CMD, RXRESET);
4147
4148         if ( info->params.mode == MGSL_MODE_HDLC ) {
4149                 /* HDLC, disabe IRQ on rxdata */
4150                 info->ie0_value &= ~RXRDYE;
4151                 write_reg(info, IE0, info->ie0_value);
4152
4153                 /* Reset all Rx DMA buffers and program rx dma */
4154                 write_reg(info, RXDMA + DSR, 0);                /* disable Rx DMA */
4155                 write_reg(info, RXDMA + DCMD, SWABORT); /* reset/init Rx DMA */
4156
4157                 for (i = 0; i < info->rx_buf_count; i++) {
4158                         info->rx_buf_list[i].status = 0xff;
4159
4160                         // throttle to 4 shared memory writes at a time to prevent
4161                         // hogging local bus (keep latency time for DMA requests low).
4162                         if (!(i % 4))
4163                                 read_status_reg(info);
4164                 }
4165                 info->current_rx_buf = 0;
4166
4167                 /* set current/1st descriptor address */
4168                 write_reg16(info, RXDMA + CDA,
4169                         info->rx_buf_list_ex[0].phys_entry);
4170
4171                 /* set new last rx descriptor address */
4172                 write_reg16(info, RXDMA + EDA,
4173                         info->rx_buf_list_ex[info->rx_buf_count - 1].phys_entry);
4174
4175                 /* set buffer length (shared by all rx dma data buffers) */
4176                 write_reg16(info, RXDMA + BFL, SCABUFSIZE);
4177
4178                 write_reg(info, RXDMA + DIR, 0x60);     /* enable Rx DMA interrupts (EOM/BOF) */
4179                 write_reg(info, RXDMA + DSR, 0xf2);     /* clear Rx DMA IRQs, enable Rx DMA */
4180         } else {
4181                 /* async, enable IRQ on rxdata */
4182                 info->ie0_value |= RXRDYE;
4183                 write_reg(info, IE0, info->ie0_value);
4184         }
4185
4186         write_reg(info, CMD, RXENABLE);
4187
4188         info->rx_overflow = false;
4189         info->rx_enabled = true;
4190 }
4191
4192 /* Enable the transmitter and send a transmit frame if
4193  * one is loaded in the DMA buffers.
4194  */
4195 static void tx_start(SLMP_INFO *info)
4196 {
4197         if (debug_level >= DEBUG_LEVEL_ISR)
4198                 printk("%s(%d):%s tx_start() tx_count=%d\n",
4199                          __FILE__,__LINE__, info->device_name,info->tx_count );
4200
4201         if (!info->tx_enabled ) {
4202                 write_reg(info, CMD, TXRESET);
4203                 write_reg(info, CMD, TXENABLE);
4204                 info->tx_enabled = true;
4205         }
4206
4207         if ( info->tx_count ) {
4208
4209                 /* If auto RTS enabled and RTS is inactive, then assert */
4210                 /* RTS and set a flag indicating that the driver should */
4211                 /* negate RTS when the transmission completes. */
4212
4213                 info->drop_rts_on_tx_done = false;
4214
4215                 if (info->params.mode != MGSL_MODE_ASYNC) {
4216
4217                         if ( info->params.flags & HDLC_FLAG_AUTO_RTS ) {
4218                                 get_signals( info );
4219                                 if ( !(info->serial_signals & SerialSignal_RTS) ) {
4220                                         info->serial_signals |= SerialSignal_RTS;
4221                                         set_signals( info );
4222                                         info->drop_rts_on_tx_done = true;
4223                                 }
4224                         }
4225
4226                         write_reg16(info, TRC0,
4227                                 (unsigned short)(((tx_negate_fifo_level-1)<<8) + tx_active_fifo_level));
4228
4229                         write_reg(info, TXDMA + DSR, 0);                /* disable DMA channel */
4230                         write_reg(info, TXDMA + DCMD, SWABORT); /* reset/init DMA channel */
4231
4232                         /* set TX CDA (current descriptor address) */
4233                         write_reg16(info, TXDMA + CDA,
4234                                 info->tx_buf_list_ex[0].phys_entry);
4235
4236                         /* set TX EDA (last descriptor address) */
4237                         write_reg16(info, TXDMA + EDA,
4238                                 info->tx_buf_list_ex[info->last_tx_buf].phys_entry);
4239
4240                         /* enable underrun IRQ */
4241                         info->ie1_value &= ~IDLE;
4242                         info->ie1_value |= UDRN;
4243                         write_reg(info, IE1, info->ie1_value);
4244                         write_reg(info, SR1, (unsigned char)(IDLE + UDRN));
4245
4246                         write_reg(info, TXDMA + DIR, 0x40);             /* enable Tx DMA interrupts (EOM) */
4247                         write_reg(info, TXDMA + DSR, 0xf2);             /* clear Tx DMA IRQs, enable Tx DMA */
4248
4249                         mod_timer(&info->tx_timer, jiffies +
4250                                         msecs_to_jiffies(5000));
4251                 }
4252                 else {
4253                         tx_load_fifo(info);
4254                         /* async, enable IRQ on txdata */
4255                         info->ie0_value |= TXRDYE;
4256                         write_reg(info, IE0, info->ie0_value);
4257                 }
4258
4259                 info->tx_active = true;
4260         }
4261 }
4262
4263 /* stop the transmitter and DMA
4264  */
4265 static void tx_stop( SLMP_INFO *info )
4266 {
4267         if (debug_level >= DEBUG_LEVEL_ISR)
4268                 printk("%s(%d):%s tx_stop()\n",
4269                          __FILE__,__LINE__, info->device_name );
4270
4271         del_timer(&info->tx_timer);
4272
4273         write_reg(info, TXDMA + DSR, 0);                /* disable DMA channel */
4274         write_reg(info, TXDMA + DCMD, SWABORT); /* reset/init DMA channel */
4275
4276         write_reg(info, CMD, TXRESET);
4277
4278         info->ie1_value &= ~(UDRN + IDLE);
4279         write_reg(info, IE1, info->ie1_value);  /* disable tx status interrupts */
4280         write_reg(info, SR1, (unsigned char)(IDLE + UDRN));     /* clear pending */
4281
4282         info->ie0_value &= ~TXRDYE;
4283         write_reg(info, IE0, info->ie0_value);  /* disable tx data interrupts */
4284
4285         info->tx_enabled = false;
4286         info->tx_active = false;
4287 }
4288
4289 /* Fill the transmit FIFO until the FIFO is full or
4290  * there is no more data to load.
4291  */
4292 static void tx_load_fifo(SLMP_INFO *info)
4293 {
4294         u8 TwoBytes[2];
4295
4296         /* do nothing is now tx data available and no XON/XOFF pending */
4297
4298         if ( !info->tx_count && !info->x_char )
4299                 return;
4300
4301         /* load the Transmit FIFO until FIFOs full or all data sent */
4302
4303         while( info->tx_count && (read_reg(info,SR0) & BIT1) ) {
4304
4305                 /* there is more space in the transmit FIFO and */
4306                 /* there is more data in transmit buffer */
4307
4308                 if ( (info->tx_count > 1) && !info->x_char ) {
4309                         /* write 16-bits */
4310                         TwoBytes[0] = info->tx_buf[info->tx_get++];
4311                         if (info->tx_get >= info->max_frame_size)
4312                                 info->tx_get -= info->max_frame_size;
4313                         TwoBytes[1] = info->tx_buf[info->tx_get++];
4314                         if (info->tx_get >= info->max_frame_size)
4315                                 info->tx_get -= info->max_frame_size;
4316
4317                         write_reg16(info, TRB, *((u16 *)TwoBytes));
4318
4319                         info->tx_count -= 2;
4320                         info->icount.tx += 2;
4321                 } else {
4322                         /* only 1 byte left to transmit or 1 FIFO slot left */
4323
4324                         if (info->x_char) {
4325                                 /* transmit pending high priority char */
4326                                 write_reg(info, TRB, info->x_char);
4327                                 info->x_char = 0;
4328                         } else {
4329                                 write_reg(info, TRB, info->tx_buf[info->tx_get++]);
4330                                 if (info->tx_get >= info->max_frame_size)
4331                                         info->tx_get -= info->max_frame_size;
4332                                 info->tx_count--;
4333                         }
4334                         info->icount.tx++;
4335                 }
4336         }
4337 }
4338
4339 /* Reset a port to a known state
4340  */
4341 static void reset_port(SLMP_INFO *info)
4342 {
4343         if (info->sca_base) {
4344
4345                 tx_stop(info);
4346                 rx_stop(info);
4347
4348                 info->serial_signals &= ~(SerialSignal_RTS | SerialSignal_DTR);
4349                 set_signals(info);
4350
4351                 /* disable all port interrupts */
4352                 info->ie0_value = 0;
4353                 info->ie1_value = 0;
4354                 info->ie2_value = 0;
4355                 write_reg(info, IE0, info->ie0_value);
4356                 write_reg(info, IE1, info->ie1_value);
4357                 write_reg(info, IE2, info->ie2_value);
4358
4359                 write_reg(info, CMD, CHRESET);
4360         }
4361 }
4362
4363 /* Reset all the ports to a known state.
4364  */
4365 static void reset_adapter(SLMP_INFO *info)
4366 {
4367         int i;
4368
4369         for ( i=0; i < SCA_MAX_PORTS; ++i) {
4370                 if (info->port_array[i])
4371                         reset_port(info->port_array[i]);
4372         }
4373 }
4374
4375 /* Program port for asynchronous communications.
4376  */
4377 static void async_mode(SLMP_INFO *info)
4378 {
4379
4380         unsigned char RegValue;
4381
4382         tx_stop(info);
4383         rx_stop(info);
4384
4385         /* MD0, Mode Register 0
4386          *
4387          * 07..05  PRCTL<2..0>, Protocol Mode, 000=async
4388          * 04      AUTO, Auto-enable (RTS/CTS/DCD)
4389          * 03      Reserved, must be 0
4390          * 02      CRCCC, CRC Calculation, 0=disabled
4391          * 01..00  STOP<1..0> Stop bits (00=1,10=2)
4392          *
4393          * 0000 0000
4394          */
4395         RegValue = 0x00;
4396         if (info->params.stop_bits != 1)
4397                 RegValue |= BIT1;
4398         write_reg(info, MD0, RegValue);
4399
4400         /* MD1, Mode Register 1
4401          *
4402          * 07..06  BRATE<1..0>, bit rate, 00=1/1 01=1/16 10=1/32 11=1/64
4403          * 05..04  TXCHR<1..0>, tx char size, 00=8 bits,01=7,10=6,11=5
4404          * 03..02  RXCHR<1..0>, rx char size
4405          * 01..00  PMPM<1..0>, Parity mode, 00=none 10=even 11=odd
4406          *
4407          * 0100 0000
4408          */
4409         RegValue = 0x40;
4410         switch (info->params.data_bits) {
4411         case 7: RegValue |= BIT4 + BIT2; break;
4412         case 6: RegValue |= BIT5 + BIT3; break;
4413         case 5: RegValue |= BIT5 + BIT4 + BIT3 + BIT2; break;
4414         }
4415         if (info->params.parity != ASYNC_PARITY_NONE) {
4416                 RegValue |= BIT1;
4417                 if (info->params.parity == ASYNC_PARITY_ODD)
4418                         RegValue |= BIT0;
4419         }
4420         write_reg(info, MD1, RegValue);
4421
4422         /* MD2, Mode Register 2
4423          *
4424          * 07..02  Reserved, must be 0
4425          * 01..00  CNCT<1..0> Channel connection, 00=normal 11=local loopback
4426          *
4427          * 0000 0000
4428          */
4429         RegValue = 0x00;
4430         if (info->params.loopback)
4431                 RegValue |= (BIT1 + BIT0);
4432         write_reg(info, MD2, RegValue);
4433
4434         /* RXS, Receive clock source
4435          *
4436          * 07      Reserved, must be 0
4437          * 06..04  RXCS<2..0>, clock source, 000=RxC Pin, 100=BRG, 110=DPLL
4438          * 03..00  RXBR<3..0>, rate divisor, 0000=1
4439          */
4440         RegValue=BIT6;
4441         write_reg(info, RXS, RegValue);
4442
4443         /* TXS, Transmit clock source
4444          *
4445          * 07      Reserved, must be 0
4446          * 06..04  RXCS<2..0>, clock source, 000=TxC Pin, 100=BRG, 110=Receive Clock
4447          * 03..00  RXBR<3..0>, rate divisor, 0000=1
4448          */
4449         RegValue=BIT6;
4450         write_reg(info, TXS, RegValue);
4451
4452         /* Control Register
4453          *
4454          * 6,4,2,0  CLKSEL<3..0>, 0 = TcCLK in, 1 = Auxclk out
4455          */
4456         info->port_array[0]->ctrlreg_value |= (BIT0 << (info->port_num * 2));
4457         write_control_reg(info);
4458
4459         tx_set_idle(info);
4460
4461         /* RRC Receive Ready Control 0
4462          *
4463          * 07..05  Reserved, must be 0
4464          * 04..00  RRC<4..0> Rx FIFO trigger active 0x00 = 1 byte
4465          */
4466         write_reg(info, RRC, 0x00);
4467
4468         /* TRC0 Transmit Ready Control 0
4469          *
4470          * 07..05  Reserved, must be 0
4471          * 04..00  TRC<4..0> Tx FIFO trigger active 0x10 = 16 bytes
4472          */
4473         write_reg(info, TRC0, 0x10);
4474
4475         /* TRC1 Transmit Ready Control 1
4476          *
4477          * 07..05  Reserved, must be 0
4478          * 04..00  TRC<4..0> Tx FIFO trigger inactive 0x1e = 31 bytes (full-1)
4479          */
4480         write_reg(info, TRC1, 0x1e);
4481
4482         /* CTL, MSCI control register
4483          *
4484          * 07..06  Reserved, set to 0
4485          * 05      UDRNC, underrun control, 0=abort 1=CRC+flag (HDLC/BSC)
4486          * 04      IDLC, idle control, 0=mark 1=idle register
4487          * 03      BRK, break, 0=off 1 =on (async)
4488          * 02      SYNCLD, sync char load enable (BSC) 1=enabled
4489          * 01      GOP, go active on poll (LOOP mode) 1=enabled
4490          * 00      RTS, RTS output control, 0=active 1=inactive
4491          *
4492          * 0001 0001
4493          */
4494         RegValue = 0x10;
4495         if (!(info->serial_signals & SerialSignal_RTS))
4496                 RegValue |= 0x01;
4497         write_reg(info, CTL, RegValue);
4498
4499         /* enable status interrupts */
4500         info->ie0_value |= TXINTE + RXINTE;
4501         write_reg(info, IE0, info->ie0_value);
4502
4503         /* enable break detect interrupt */
4504         info->ie1_value = BRKD;
4505         write_reg(info, IE1, info->ie1_value);
4506
4507         /* enable rx overrun interrupt */
4508         info->ie2_value = OVRN;
4509         write_reg(info, IE2, info->ie2_value);
4510
4511         set_rate( info, info->params.data_rate * 16 );
4512 }
4513
4514 /* Program the SCA for HDLC communications.
4515  */
4516 static void hdlc_mode(SLMP_INFO *info)
4517 {
4518         unsigned char RegValue;
4519         u32 DpllDivisor;
4520
4521         // Can't use DPLL because SCA outputs recovered clock on RxC when
4522         // DPLL mode selected. This causes output contention with RxC receiver.
4523         // Use of DPLL would require external hardware to disable RxC receiver
4524         // when DPLL mode selected.
4525         info->params.flags &= ~(HDLC_FLAG_TXC_DPLL + HDLC_FLAG_RXC_DPLL);
4526
4527         /* disable DMA interrupts */
4528         write_reg(info, TXDMA + DIR, 0);
4529         write_reg(info, RXDMA + DIR, 0);
4530
4531         /* MD0, Mode Register 0
4532          *
4533          * 07..05  PRCTL<2..0>, Protocol Mode, 100=HDLC
4534          * 04      AUTO, Auto-enable (RTS/CTS/DCD)
4535          * 03      Reserved, must be 0
4536          * 02      CRCCC, CRC Calculation, 1=enabled
4537          * 01      CRC1, CRC selection, 0=CRC-16,1=CRC-CCITT-16
4538          * 00      CRC0, CRC initial value, 1 = all 1s
4539          *
4540          * 1000 0001
4541          */
4542         RegValue = 0x81;
4543         if (info->params.flags & HDLC_FLAG_AUTO_CTS)
4544                 RegValue |= BIT4;
4545         if (info->params.flags & HDLC_FLAG_AUTO_DCD)
4546                 RegValue |= BIT4;
4547         if (info->params.crc_type == HDLC_CRC_16_CCITT)
4548                 RegValue |= BIT2 + BIT1;
4549         write_reg(info, MD0, RegValue);
4550
4551         /* MD1, Mode Register 1
4552          *
4553          * 07..06  ADDRS<1..0>, Address detect, 00=no addr check
4554          * 05..04  TXCHR<1..0>, tx char size, 00=8 bits
4555          * 03..02  RXCHR<1..0>, rx char size, 00=8 bits
4556          * 01..00  PMPM<1..0>, Parity mode, 00=no parity
4557          *
4558          * 0000 0000
4559          */
4560         RegValue = 0x00;
4561         write_reg(info, MD1, RegValue);
4562
4563         /* MD2, Mode Register 2
4564          *
4565          * 07      NRZFM, 0=NRZ, 1=FM
4566          * 06..05  CODE<1..0> Encoding, 00=NRZ
4567          * 04..03  DRATE<1..0> DPLL Divisor, 00=8
4568          * 02      Reserved, must be 0
4569          * 01..00  CNCT<1..0> Channel connection, 0=normal
4570          *
4571          * 0000 0000
4572          */
4573         RegValue = 0x00;
4574         switch(info->params.encoding) {
4575         case HDLC_ENCODING_NRZI:          RegValue |= BIT5; break;
4576         case HDLC_ENCODING_BIPHASE_MARK:  RegValue |= BIT7 + BIT5; break; /* aka FM1 */
4577         case HDLC_ENCODING_BIPHASE_SPACE: RegValue |= BIT7 + BIT6; break; /* aka FM0 */
4578         case HDLC_ENCODING_BIPHASE_LEVEL: RegValue |= BIT7; break;      /* aka Manchester */
4579 #if 0
4580         case HDLC_ENCODING_NRZB:                                        /* not supported */
4581         case HDLC_ENCODING_NRZI_MARK:                                   /* not supported */
4582         case HDLC_ENCODING_DIFF_BIPHASE_LEVEL:                          /* not supported */
4583 #endif
4584         }
4585         if ( info->params.flags & HDLC_FLAG_DPLL_DIV16 ) {
4586                 DpllDivisor = 16;
4587                 RegValue |= BIT3;
4588         } else if ( info->params.flags & HDLC_FLAG_DPLL_DIV8 ) {
4589                 DpllDivisor = 8;
4590         } else {
4591                 DpllDivisor = 32;
4592                 RegValue |= BIT4;
4593         }
4594         write_reg(info, MD2, RegValue);
4595
4596
4597         /* RXS, Receive clock source
4598          *
4599          * 07      Reserved, must be 0
4600          * 06..04  RXCS<2..0>, clock source, 000=RxC Pin, 100=BRG, 110=DPLL
4601          * 03..00  RXBR<3..0>, rate divisor, 0000=1
4602          */
4603         RegValue=0;
4604         if (info->params.flags & HDLC_FLAG_RXC_BRG)
4605                 RegValue |= BIT6;
4606         if (info->params.flags & HDLC_FLAG_RXC_DPLL)
4607                 RegValue |= BIT6 + BIT5;
4608         write_reg(info, RXS, RegValue);
4609
4610         /* TXS, Transmit clock source
4611          *
4612          * 07      Reserved, must be 0
4613          * 06..04  RXCS<2..0>, clock source, 000=TxC Pin, 100=BRG, 110=Receive Clock
4614          * 03..00  RXBR<3..0>, rate divisor, 0000=1
4615          */
4616         RegValue=0;
4617         if (info->params.flags & HDLC_FLAG_TXC_BRG)
4618                 RegValue |= BIT6;
4619         if (info->params.flags & HDLC_FLAG_TXC_DPLL)
4620                 RegValue |= BIT6 + BIT5;
4621         write_reg(info, TXS, RegValue);
4622
4623         if (info->params.flags & HDLC_FLAG_RXC_DPLL)
4624                 set_rate(info, info->params.clock_speed * DpllDivisor);
4625         else
4626                 set_rate(info, info->params.clock_speed);
4627
4628         /* GPDATA (General Purpose I/O Data Register)
4629          *
4630          * 6,4,2,0  CLKSEL<3..0>, 0 = TcCLK in, 1 = Auxclk out
4631          */
4632         if (info->params.flags & HDLC_FLAG_TXC_BRG)
4633                 info->port_array[0]->ctrlreg_value |= (BIT0 << (info->port_num * 2));
4634         else
4635                 info->port_array[0]->ctrlreg_value &= ~(BIT0 << (info->port_num * 2));
4636         write_control_reg(info);
4637
4638         /* RRC Receive Ready Control 0
4639          *
4640          * 07..05  Reserved, must be 0
4641          * 04..00  RRC<4..0> Rx FIFO trigger active
4642          */
4643         write_reg(info, RRC, rx_active_fifo_level);
4644
4645         /* TRC0 Transmit Ready Control 0
4646          *
4647          * 07..05  Reserved, must be 0
4648          * 04..00  TRC<4..0> Tx FIFO trigger active
4649          */
4650         write_reg(info, TRC0, tx_active_fifo_level);
4651
4652         /* TRC1 Transmit Ready Control 1
4653          *
4654          * 07..05  Reserved, must be 0
4655          * 04..00  TRC<4..0> Tx FIFO trigger inactive 0x1f = 32 bytes (full)
4656          */
4657         write_reg(info, TRC1, (unsigned char)(tx_negate_fifo_level - 1));
4658
4659         /* DMR, DMA Mode Register
4660          *
4661          * 07..05  Reserved, must be 0
4662          * 04      TMOD, Transfer Mode: 1=chained-block
4663          * 03      Reserved, must be 0
4664          * 02      NF, Number of Frames: 1=multi-frame
4665          * 01      CNTE, Frame End IRQ Counter enable: 0=disabled
4666          * 00      Reserved, must be 0
4667          *
4668          * 0001 0100
4669          */
4670         write_reg(info, TXDMA + DMR, 0x14);
4671         write_reg(info, RXDMA + DMR, 0x14);
4672
4673         /* Set chain pointer base (upper 8 bits of 24 bit addr) */
4674         write_reg(info, RXDMA + CPB,
4675                 (unsigned char)(info->buffer_list_phys >> 16));
4676
4677         /* Set chain pointer base (upper 8 bits of 24 bit addr) */
4678         write_reg(info, TXDMA + CPB,
4679                 (unsigned char)(info->buffer_list_phys >> 16));
4680
4681         /* enable status interrupts. other code enables/disables
4682          * the individual sources for these two interrupt classes.
4683          */
4684         info->ie0_value |= TXINTE + RXINTE;
4685         write_reg(info, IE0, info->ie0_value);
4686
4687         /* CTL, MSCI control register
4688          *
4689          * 07..06  Reserved, set to 0
4690          * 05      UDRNC, underrun control, 0=abort 1=CRC+flag (HDLC/BSC)
4691          * 04      IDLC, idle control, 0=mark 1=idle register
4692          * 03      BRK, break, 0=off 1 =on (async)
4693          * 02      SYNCLD, sync char load enable (BSC) 1=enabled
4694          * 01      GOP, go active on poll (LOOP mode) 1=enabled
4695          * 00      RTS, RTS output control, 0=active 1=inactive
4696          *
4697          * 0001 0001
4698          */
4699         RegValue = 0x10;
4700         if (!(info->serial_signals & SerialSignal_RTS))
4701                 RegValue |= 0x01;
4702         write_reg(info, CTL, RegValue);
4703
4704         /* preamble not supported ! */
4705
4706         tx_set_idle(info);
4707         tx_stop(info);
4708         rx_stop(info);
4709
4710         set_rate(info, info->params.clock_speed);
4711
4712         if (info->params.loopback)
4713                 enable_loopback(info,1);
4714 }
4715
4716 /* Set the transmit HDLC idle mode
4717  */
4718 static void tx_set_idle(SLMP_INFO *info)
4719 {
4720         unsigned char RegValue = 0xff;
4721
4722         /* Map API idle mode to SCA register bits */
4723         switch(info->idle_mode) {
4724         case HDLC_TXIDLE_FLAGS:                 RegValue = 0x7e; break;
4725         case HDLC_TXIDLE_ALT_ZEROS_ONES:        RegValue = 0xaa; break;
4726         case HDLC_TXIDLE_ZEROS:                 RegValue = 0x00; break;
4727         case HDLC_TXIDLE_ONES:                  RegValue = 0xff; break;
4728         case HDLC_TXIDLE_ALT_MARK_SPACE:        RegValue = 0xaa; break;
4729         case HDLC_TXIDLE_SPACE:                 RegValue = 0x00; break;
4730         case HDLC_TXIDLE_MARK:                  RegValue = 0xff; break;
4731         }
4732
4733         write_reg(info, IDL, RegValue);
4734 }
4735
4736 /* Query the adapter for the state of the V24 status (input) signals.
4737  */
4738 static void get_signals(SLMP_INFO *info)
4739 {
4740         u16 status = read_reg(info, SR3);
4741         u16 gpstatus = read_status_reg(info);
4742         u16 testbit;
4743
4744         /* clear all serial signals except RTS and DTR */
4745         info->serial_signals &= SerialSignal_RTS | SerialSignal_DTR;
4746
4747         /* set serial signal bits to reflect MISR */
4748
4749         if (!(status & BIT3))
4750                 info->serial_signals |= SerialSignal_CTS;
4751
4752         if ( !(status & BIT2))
4753                 info->serial_signals |= SerialSignal_DCD;
4754
4755         testbit = BIT1 << (info->port_num * 2); // Port 0..3 RI is GPDATA<1,3,5,7>
4756         if (!(gpstatus & testbit))
4757                 info->serial_signals |= SerialSignal_RI;
4758
4759         testbit = BIT0 << (info->port_num * 2); // Port 0..3 DSR is GPDATA<0,2,4,6>
4760         if (!(gpstatus & testbit))
4761                 info->serial_signals |= SerialSignal_DSR;
4762 }
4763
4764 /* Set the state of RTS and DTR based on contents of
4765  * serial_signals member of device context.
4766  */
4767 static void set_signals(SLMP_INFO *info)
4768 {
4769         unsigned char RegValue;
4770         u16 EnableBit;
4771
4772         RegValue = read_reg(info, CTL);
4773         if (info->serial_signals & SerialSignal_RTS)
4774                 RegValue &= ~BIT0;
4775         else
4776                 RegValue |= BIT0;
4777         write_reg(info, CTL, RegValue);
4778
4779         // Port 0..3 DTR is ctrl reg <1,3,5,7>
4780         EnableBit = BIT1 << (info->port_num*2);
4781         if (info->serial_signals & SerialSignal_DTR)
4782                 info->port_array[0]->ctrlreg_value &= ~EnableBit;
4783         else
4784                 info->port_array[0]->ctrlreg_value |= EnableBit;
4785         write_control_reg(info);
4786 }
4787
4788 /*******************/
4789 /* DMA Buffer Code */
4790 /*******************/
4791
4792 /* Set the count for all receive buffers to SCABUFSIZE
4793  * and set the current buffer to the first buffer. This effectively
4794  * makes all buffers free and discards any data in buffers.
4795  */
4796 static void rx_reset_buffers(SLMP_INFO *info)
4797 {
4798         rx_free_frame_buffers(info, 0, info->rx_buf_count - 1);
4799 }
4800
4801 /* Free the buffers used by a received frame
4802  *
4803  * info   pointer to device instance data
4804  * first  index of 1st receive buffer of frame
4805  * last   index of last receive buffer of frame
4806  */
4807 static void rx_free_frame_buffers(SLMP_INFO *info, unsigned int first, unsigned int last)
4808 {
4809         bool done = false;
4810
4811         while(!done) {
4812                 /* reset current buffer for reuse */
4813                 info->rx_buf_list[first].status = 0xff;
4814
4815                 if (first == last) {
4816                         done = true;
4817                         /* set new last rx descriptor address */
4818                         write_reg16(info, RXDMA + EDA, info->rx_buf_list_ex[first].phys_entry);
4819                 }
4820
4821                 first++;
4822                 if (first == info->rx_buf_count)
4823                         first = 0;
4824         }
4825
4826         /* set current buffer to next buffer after last buffer of frame */
4827         info->current_rx_buf = first;
4828 }
4829
4830 /* Return a received frame from the receive DMA buffers.
4831  * Only frames received without errors are returned.
4832  *
4833  * Return Value:        true if frame returned, otherwise false
4834  */
4835 static bool rx_get_frame(SLMP_INFO *info)
4836 {
4837         unsigned int StartIndex, EndIndex;      /* index of 1st and last buffers of Rx frame */
4838         unsigned short status;
4839         unsigned int framesize = 0;
4840         bool ReturnCode = false;
4841         unsigned long flags;
4842         struct tty_struct *tty = info->port.tty;
4843         unsigned char addr_field = 0xff;
4844         SCADESC *desc;
4845         SCADESC_EX *desc_ex;
4846
4847 CheckAgain:
4848         /* assume no frame returned, set zero length */
4849         framesize = 0;
4850         addr_field = 0xff;
4851
4852         /*
4853          * current_rx_buf points to the 1st buffer of the next available
4854          * receive frame. To find the last buffer of the frame look for
4855          * a non-zero status field in the buffer entries. (The status
4856          * field is set by the 16C32 after completing a receive frame.
4857          */
4858         StartIndex = EndIndex = info->current_rx_buf;
4859
4860         for ( ;; ) {
4861                 desc = &info->rx_buf_list[EndIndex];
4862                 desc_ex = &info->rx_buf_list_ex[EndIndex];
4863
4864                 if (desc->status == 0xff)
4865                         goto Cleanup;   /* current desc still in use, no frames available */
4866
4867                 if (framesize == 0 && info->params.addr_filter != 0xff)
4868                         addr_field = desc_ex->virt_addr[0];
4869
4870                 framesize += desc->length;
4871
4872                 /* Status != 0 means last buffer of frame */
4873                 if (desc->status)
4874                         break;
4875
4876                 EndIndex++;
4877                 if (EndIndex == info->rx_buf_count)
4878                         EndIndex = 0;
4879
4880                 if (EndIndex == info->current_rx_buf) {
4881                         /* all buffers have been 'used' but none mark      */
4882                         /* the end of a frame. Reset buffers and receiver. */
4883                         if ( info->rx_enabled ){
4884                                 spin_lock_irqsave(&info->lock,flags);
4885                                 rx_start(info);
4886                                 spin_unlock_irqrestore(&info->lock,flags);
4887                         }
4888                         goto Cleanup;
4889                 }
4890
4891         }
4892
4893         /* check status of receive frame */
4894
4895         /* frame status is byte stored after frame data
4896          *
4897          * 7 EOM (end of msg), 1 = last buffer of frame
4898          * 6 Short Frame, 1 = short frame
4899          * 5 Abort, 1 = frame aborted
4900          * 4 Residue, 1 = last byte is partial
4901          * 3 Overrun, 1 = overrun occurred during frame reception
4902          * 2 CRC,     1 = CRC error detected
4903          *
4904          */
4905         status = desc->status;
4906
4907         /* ignore CRC bit if not using CRC (bit is undefined) */
4908         /* Note:CRC is not save to data buffer */
4909         if (info->params.crc_type == HDLC_CRC_NONE)
4910                 status &= ~BIT2;
4911
4912         if (framesize == 0 ||
4913                  (addr_field != 0xff && addr_field != info->params.addr_filter)) {
4914                 /* discard 0 byte frames, this seems to occur sometime
4915                  * when remote is idling flags.
4916                  */
4917                 rx_free_frame_buffers(info, StartIndex, EndIndex);
4918                 goto CheckAgain;
4919         }
4920
4921         if (framesize < 2)
4922                 status |= BIT6;
4923
4924         if (status & (BIT6+BIT5+BIT3+BIT2)) {
4925                 /* received frame has errors,
4926                  * update counts and mark frame size as 0
4927                  */
4928                 if (status & BIT6)
4929                         info->icount.rxshort++;
4930                 else if (status & BIT5)
4931                         info->icount.rxabort++;
4932                 else if (status & BIT3)
4933                         info->icount.rxover++;
4934                 else
4935                         info->icount.rxcrc++;
4936
4937                 framesize = 0;
4938 #if SYNCLINK_GENERIC_HDLC
4939                 {
4940                         info->netdev->stats.rx_errors++;
4941                         info->netdev->stats.rx_frame_errors++;
4942                 }
4943 #endif
4944         }
4945
4946         if ( debug_level >= DEBUG_LEVEL_BH )
4947                 printk("%s(%d):%s rx_get_frame() status=%04X size=%d\n",
4948                         __FILE__,__LINE__,info->device_name,status,framesize);
4949
4950         if ( debug_level >= DEBUG_LEVEL_DATA )
4951                 trace_block(info,info->rx_buf_list_ex[StartIndex].virt_addr,
4952                         min_t(unsigned int, framesize, SCABUFSIZE), 0);
4953
4954         if (framesize) {
4955                 if (framesize > info->max_frame_size)
4956                         info->icount.rxlong++;
4957                 else {
4958                         /* copy dma buffer(s) to contiguous intermediate buffer */
4959                         int copy_count = framesize;
4960                         int index = StartIndex;
4961                         unsigned char *ptmp = info->tmp_rx_buf;
4962                         info->tmp_rx_buf_count = framesize;
4963
4964                         info->icount.rxok++;
4965
4966                         while(copy_count) {
4967                                 int partial_count = min(copy_count,SCABUFSIZE);
4968                                 memcpy( ptmp,
4969                                         info->rx_buf_list_ex[index].virt_addr,
4970                                         partial_count );
4971                                 ptmp += partial_count;
4972                                 copy_count -= partial_count;
4973
4974                                 if ( ++index == info->rx_buf_count )
4975                                         index = 0;
4976                         }
4977
4978 #if SYNCLINK_GENERIC_HDLC
4979                         if (info->netcount)
4980                                 hdlcdev_rx(info,info->tmp_rx_buf,framesize);
4981                         else
4982 #endif
4983                                 ldisc_receive_buf(tty,info->tmp_rx_buf,
4984                                                   info->flag_buf, framesize);
4985                 }
4986         }
4987         /* Free the buffers used by this frame. */
4988         rx_free_frame_buffers( info, StartIndex, EndIndex );
4989
4990         ReturnCode = true;
4991
4992 Cleanup:
4993         if ( info->rx_enabled && info->rx_overflow ) {
4994                 /* Receiver is enabled, but needs to restarted due to
4995                  * rx buffer overflow. If buffers are empty, restart receiver.
4996                  */
4997                 if (info->rx_buf_list[EndIndex].status == 0xff) {
4998                         spin_lock_irqsave(&info->lock,flags);
4999                         rx_start(info);
5000                         spin_unlock_irqrestore(&info->lock,flags);
5001                 }
5002         }
5003
5004         return ReturnCode;
5005 }
5006
5007 /* load the transmit DMA buffer with data
5008  */
5009 static void tx_load_dma_buffer(SLMP_INFO *info, const char *buf, unsigned int count)
5010 {
5011         unsigned short copy_count;
5012         unsigned int i = 0;
5013         SCADESC *desc;
5014         SCADESC_EX *desc_ex;
5015
5016         if ( debug_level >= DEBUG_LEVEL_DATA )
5017                 trace_block(info, buf, min_t(unsigned int, count, SCABUFSIZE), 1);
5018
5019         /* Copy source buffer to one or more DMA buffers, starting with
5020          * the first transmit dma buffer.
5021          */
5022         for(i=0;;)
5023         {
5024                 copy_count = min_t(unsigned int, count, SCABUFSIZE);
5025
5026                 desc = &info->tx_buf_list[i];
5027                 desc_ex = &info->tx_buf_list_ex[i];
5028
5029                 load_pci_memory(info, desc_ex->virt_addr,buf,copy_count);
5030
5031                 desc->length = copy_count;
5032                 desc->status = 0;
5033
5034                 buf += copy_count;
5035                 count -= copy_count;
5036
5037                 if (!count)
5038                         break;
5039
5040                 i++;
5041                 if (i >= info->tx_buf_count)
5042                         i = 0;
5043         }
5044
5045         info->tx_buf_list[i].status = 0x81;     /* set EOM and EOT status */
5046         info->last_tx_buf = ++i;
5047 }
5048
5049 static bool register_test(SLMP_INFO *info)
5050 {
5051         static unsigned char testval[] = {0x00, 0xff, 0xaa, 0x55, 0x69, 0x96};
5052         static unsigned int count = ARRAY_SIZE(testval);
5053         unsigned int i;
5054         bool rc = true;
5055         unsigned long flags;
5056
5057         spin_lock_irqsave(&info->lock,flags);
5058         reset_port(info);
5059
5060         /* assume failure */
5061         info->init_error = DiagStatus_AddressFailure;
5062
5063         /* Write bit patterns to various registers but do it out of */
5064         /* sync, then read back and verify values. */
5065
5066         for (i = 0 ; i < count ; i++) {
5067                 write_reg(info, TMC, testval[i]);
5068                 write_reg(info, IDL, testval[(i+1)%count]);
5069                 write_reg(info, SA0, testval[(i+2)%count]);
5070                 write_reg(info, SA1, testval[(i+3)%count]);
5071
5072                 if ( (read_reg(info, TMC) != testval[i]) ||
5073                           (read_reg(info, IDL) != testval[(i+1)%count]) ||
5074                           (read_reg(info, SA0) != testval[(i+2)%count]) ||
5075                           (read_reg(info, SA1) != testval[(i+3)%count]) )
5076                 {
5077                         rc = false;
5078                         break;
5079                 }
5080         }
5081
5082         reset_port(info);
5083         spin_unlock_irqrestore(&info->lock,flags);
5084
5085         return rc;
5086 }
5087
5088 static bool irq_test(SLMP_INFO *info)
5089 {
5090         unsigned long timeout;
5091         unsigned long flags;
5092
5093         unsigned char timer = (info->port_num & 1) ? TIMER2 : TIMER0;
5094
5095         spin_lock_irqsave(&info->lock,flags);
5096         reset_port(info);
5097
5098         /* assume failure */
5099         info->init_error = DiagStatus_IrqFailure;
5100         info->irq_occurred = false;
5101
5102         /* setup timer0 on SCA0 to interrupt */
5103
5104         /* IER2<7..4> = timer<3..0> interrupt enables (1=enabled) */
5105         write_reg(info, IER2, (unsigned char)((info->port_num & 1) ? BIT6 : BIT4));
5106
5107         write_reg(info, (unsigned char)(timer + TEPR), 0);      /* timer expand prescale */
5108         write_reg16(info, (unsigned char)(timer + TCONR), 1);   /* timer constant */
5109
5110
5111         /* TMCS, Timer Control/Status Register
5112          *
5113          * 07      CMF, Compare match flag (read only) 1=match
5114          * 06      ECMI, CMF Interrupt Enable: 1=enabled
5115          * 05      Reserved, must be 0
5116          * 04      TME, Timer Enable
5117          * 03..00  Reserved, must be 0
5118          *
5119          * 0101 0000
5120          */
5121         write_reg(info, (unsigned char)(timer + TMCS), 0x50);
5122
5123         spin_unlock_irqrestore(&info->lock,flags);
5124
5125         timeout=100;
5126         while( timeout-- && !info->irq_occurred ) {
5127                 msleep_interruptible(10);
5128         }
5129
5130         spin_lock_irqsave(&info->lock,flags);
5131         reset_port(info);
5132         spin_unlock_irqrestore(&info->lock,flags);
5133
5134         return info->irq_occurred;
5135 }
5136
5137 /* initialize individual SCA device (2 ports)
5138  */
5139 static bool sca_init(SLMP_INFO *info)
5140 {
5141         /* set wait controller to single mem partition (low), no wait states */
5142         write_reg(info, PABR0, 0);      /* wait controller addr boundary 0 */
5143         write_reg(info, PABR1, 0);      /* wait controller addr boundary 1 */
5144         write_reg(info, WCRL, 0);       /* wait controller low range */
5145         write_reg(info, WCRM, 0);       /* wait controller mid range */
5146         write_reg(info, WCRH, 0);       /* wait controller high range */
5147
5148         /* DPCR, DMA Priority Control
5149          *
5150          * 07..05  Not used, must be 0
5151          * 04      BRC, bus release condition: 0=all transfers complete
5152          * 03      CCC, channel change condition: 0=every cycle
5153          * 02..00  PR<2..0>, priority 100=round robin
5154          *
5155          * 00000100 = 0x04
5156          */
5157         write_reg(info, DPCR, dma_priority);
5158
5159         /* DMA Master Enable, BIT7: 1=enable all channels */
5160         write_reg(info, DMER, 0x80);
5161
5162         /* enable all interrupt classes */
5163         write_reg(info, IER0, 0xff);    /* TxRDY,RxRDY,TxINT,RxINT (ports 0-1) */
5164         write_reg(info, IER1, 0xff);    /* DMIB,DMIA (channels 0-3) */
5165         write_reg(info, IER2, 0xf0);    /* TIRQ (timers 0-3) */
5166
5167         /* ITCR, interrupt control register
5168          * 07      IPC, interrupt priority, 0=MSCI->DMA
5169          * 06..05  IAK<1..0>, Acknowledge cycle, 00=non-ack cycle
5170          * 04      VOS, Vector Output, 0=unmodified vector
5171          * 03..00  Reserved, must be 0
5172          */
5173         write_reg(info, ITCR, 0);
5174
5175         return true;
5176 }
5177
5178 /* initialize adapter hardware
5179  */
5180 static bool init_adapter(SLMP_INFO *info)
5181 {
5182         int i;
5183
5184         /* Set BIT30 of Local Control Reg 0x50 to reset SCA */
5185         volatile u32 *MiscCtrl = (u32 *)(info->lcr_base + 0x50);
5186         u32 readval;
5187
5188         info->misc_ctrl_value |= BIT30;
5189         *MiscCtrl = info->misc_ctrl_value;
5190
5191         /*
5192          * Force at least 170ns delay before clearing
5193          * reset bit. Each read from LCR takes at least
5194          * 30ns so 10 times for 300ns to be safe.
5195          */
5196         for(i=0;i<10;i++)
5197                 readval = *MiscCtrl;
5198
5199         info->misc_ctrl_value &= ~BIT30;
5200         *MiscCtrl = info->misc_ctrl_value;
5201
5202         /* init control reg (all DTRs off, all clksel=input) */
5203         info->ctrlreg_value = 0xaa;
5204         write_control_reg(info);
5205
5206         {
5207                 volatile u32 *LCR1BRDR = (u32 *)(info->lcr_base + 0x2c);
5208                 lcr1_brdr_value &= ~(BIT5 + BIT4 + BIT3);
5209
5210                 switch(read_ahead_count)
5211                 {
5212                 case 16:
5213                         lcr1_brdr_value |= BIT5 + BIT4 + BIT3;
5214                         break;
5215                 case 8:
5216                         lcr1_brdr_value |= BIT5 + BIT4;
5217                         break;
5218                 case 4:
5219                         lcr1_brdr_value |= BIT5 + BIT3;
5220                         break;
5221                 case 0:
5222                         lcr1_brdr_value |= BIT5;
5223                         break;
5224                 }
5225
5226                 *LCR1BRDR = lcr1_brdr_value;
5227                 *MiscCtrl = misc_ctrl_value;
5228         }
5229
5230         sca_init(info->port_array[0]);
5231         sca_init(info->port_array[2]);
5232
5233         return true;
5234 }
5235
5236 /* Loopback an HDLC frame to test the hardware
5237  * interrupt and DMA functions.
5238  */
5239 static bool loopback_test(SLMP_INFO *info)
5240 {
5241 #define TESTFRAMESIZE 20
5242
5243         unsigned long timeout;
5244         u16 count = TESTFRAMESIZE;
5245         unsigned char buf[TESTFRAMESIZE];
5246         bool rc = false;
5247         unsigned long flags;
5248
5249         struct tty_struct *oldtty = info->port.tty;
5250         u32 speed = info->params.clock_speed;
5251
5252         info->params.clock_speed = 3686400;
5253         info->port.tty = NULL;
5254
5255         /* assume failure */
5256         info->init_error = DiagStatus_DmaFailure;
5257
5258         /* build and send transmit frame */
5259         for (count = 0; count < TESTFRAMESIZE;++count)
5260                 buf[count] = (unsigned char)count;
5261
5262         memset(info->tmp_rx_buf,0,TESTFRAMESIZE);
5263
5264         /* program hardware for HDLC and enabled receiver */
5265         spin_lock_irqsave(&info->lock,flags);
5266         hdlc_mode(info);
5267         enable_loopback(info,1);
5268         rx_start(info);
5269         info->tx_count = count;
5270         tx_load_dma_buffer(info,buf,count);
5271         tx_start(info);
5272         spin_unlock_irqrestore(&info->lock,flags);
5273
5274         /* wait for receive complete */
5275         /* Set a timeout for waiting for interrupt. */
5276         for ( timeout = 100; timeout; --timeout ) {
5277                 msleep_interruptible(10);
5278
5279                 if (rx_get_frame(info)) {
5280                         rc = true;
5281                         break;
5282                 }
5283         }
5284
5285         /* verify received frame length and contents */
5286         if (rc &&
5287             ( info->tmp_rx_buf_count != count ||
5288               memcmp(buf, info->tmp_rx_buf,count))) {
5289                 rc = false;
5290         }
5291
5292         spin_lock_irqsave(&info->lock,flags);
5293         reset_adapter(info);
5294         spin_unlock_irqrestore(&info->lock,flags);
5295
5296         info->params.clock_speed = speed;
5297         info->port.tty = oldtty;
5298
5299         return rc;
5300 }
5301
5302 /* Perform diagnostics on hardware
5303  */
5304 static int adapter_test( SLMP_INFO *info )
5305 {
5306         unsigned long flags;
5307         if ( debug_level >= DEBUG_LEVEL_INFO )
5308                 printk( "%s(%d):Testing device %s\n",
5309                         __FILE__,__LINE__,info->device_name );
5310
5311         spin_lock_irqsave(&info->lock,flags);
5312         init_adapter(info);
5313         spin_unlock_irqrestore(&info->lock,flags);
5314
5315         info->port_array[0]->port_count = 0;
5316
5317         if ( register_test(info->port_array[0]) &&
5318                 register_test(info->port_array[1])) {
5319
5320                 info->port_array[0]->port_count = 2;
5321
5322                 if ( register_test(info->port_array[2]) &&
5323                         register_test(info->port_array[3]) )
5324                         info->port_array[0]->port_count += 2;
5325         }
5326         else {
5327                 printk( "%s(%d):Register test failure for device %s Addr=%08lX\n",
5328                         __FILE__,__LINE__,info->device_name, (unsigned long)(info->phys_sca_base));
5329                 return -ENODEV;
5330         }
5331
5332         if ( !irq_test(info->port_array[0]) ||
5333                 !irq_test(info->port_array[1]) ||
5334                  (info->port_count == 4 && !irq_test(info->port_array[2])) ||
5335                  (info->port_count == 4 && !irq_test(info->port_array[3]))) {
5336                 printk( "%s(%d):Interrupt test failure for device %s IRQ=%d\n",
5337                         __FILE__,__LINE__,info->device_name, (unsigned short)(info->irq_level) );
5338                 return -ENODEV;
5339         }
5340
5341         if (!loopback_test(info->port_array[0]) ||
5342                 !loopback_test(info->port_array[1]) ||
5343                  (info->port_count == 4 && !loopback_test(info->port_array[2])) ||
5344                  (info->port_count == 4 && !loopback_test(info->port_array[3]))) {
5345                 printk( "%s(%d):DMA test failure for device %s\n",
5346                         __FILE__,__LINE__,info->device_name);
5347                 return -ENODEV;
5348         }
5349
5350         if ( debug_level >= DEBUG_LEVEL_INFO )
5351                 printk( "%s(%d):device %s passed diagnostics\n",
5352                         __FILE__,__LINE__,info->device_name );
5353
5354         info->port_array[0]->init_error = 0;
5355         info->port_array[1]->init_error = 0;
5356         if ( info->port_count > 2 ) {
5357                 info->port_array[2]->init_error = 0;
5358                 info->port_array[3]->init_error = 0;
5359         }
5360
5361         return 0;
5362 }
5363
5364 /* Test the shared memory on a PCI adapter.
5365  */
5366 static bool memory_test(SLMP_INFO *info)
5367 {
5368         static unsigned long testval[] = { 0x0, 0x55555555, 0xaaaaaaaa,
5369                 0x66666666, 0x99999999, 0xffffffff, 0x12345678 };
5370         unsigned long count = ARRAY_SIZE(testval);
5371         unsigned long i;
5372         unsigned long limit = SCA_MEM_SIZE/sizeof(unsigned long);
5373         unsigned long * addr = (unsigned long *)info->memory_base;
5374
5375         /* Test data lines with test pattern at one location. */
5376
5377         for ( i = 0 ; i < count ; i++ ) {
5378                 *addr = testval[i];
5379                 if ( *addr != testval[i] )
5380                         return false;
5381         }
5382
5383         /* Test address lines with incrementing pattern over */
5384         /* entire address range. */
5385
5386         for ( i = 0 ; i < limit ; i++ ) {
5387                 *addr = i * 4;
5388                 addr++;
5389         }
5390
5391         addr = (unsigned long *)info->memory_base;
5392
5393         for ( i = 0 ; i < limit ; i++ ) {
5394                 if ( *addr != i * 4 )
5395                         return false;
5396                 addr++;
5397         }
5398
5399         memset( info->memory_base, 0, SCA_MEM_SIZE );
5400         return true;
5401 }
5402
5403 /* Load data into PCI adapter shared memory.
5404  *
5405  * The PCI9050 releases control of the local bus
5406  * after completing the current read or write operation.
5407  *
5408  * While the PCI9050 write FIFO not empty, the
5409  * PCI9050 treats all of the writes as a single transaction
5410  * and does not release the bus. This causes DMA latency problems
5411  * at high speeds when copying large data blocks to the shared memory.
5412  *
5413  * This function breaks a write into multiple transations by
5414  * interleaving a read which flushes the write FIFO and 'completes'
5415  * the write transation. This allows any pending DMA request to gain control
5416  * of the local bus in a timely fasion.
5417  */
5418 static void load_pci_memory(SLMP_INFO *info, char* dest, const char* src, unsigned short count)
5419 {
5420         /* A load interval of 16 allows for 4 32-bit writes at */
5421         /* 136ns each for a maximum latency of 542ns on the local bus.*/
5422
5423         unsigned short interval = count / sca_pci_load_interval;
5424         unsigned short i;
5425
5426         for ( i = 0 ; i < interval ; i++ )
5427         {
5428                 memcpy(dest, src, sca_pci_load_interval);
5429                 read_status_reg(info);
5430                 dest += sca_pci_load_interval;
5431                 src += sca_pci_load_interval;
5432         }
5433
5434         memcpy(dest, src, count % sca_pci_load_interval);
5435 }
5436
5437 static void trace_block(SLMP_INFO *info,const char* data, int count, int xmit)
5438 {
5439         int i;
5440         int linecount;
5441         if (xmit)
5442                 printk("%s tx data:\n",info->device_name);
5443         else
5444                 printk("%s rx data:\n",info->device_name);
5445
5446         while(count) {
5447                 if (count > 16)
5448                         linecount = 16;
5449                 else
5450                         linecount = count;
5451
5452                 for(i=0;i<linecount;i++)
5453                         printk("%02X ",(unsigned char)data[i]);
5454                 for(;i<17;i++)
5455                         printk("   ");
5456                 for(i=0;i<linecount;i++) {
5457                         if (data[i]>=040 && data[i]<=0176)
5458                                 printk("%c",data[i]);
5459                         else
5460                                 printk(".");
5461                 }
5462                 printk("\n");
5463
5464                 data  += linecount;
5465                 count -= linecount;
5466         }
5467 }       /* end of trace_block() */
5468
5469 /* called when HDLC frame times out
5470  * update stats and do tx completion processing
5471  */
5472 static void tx_timeout(unsigned long context)
5473 {
5474         SLMP_INFO *info = (SLMP_INFO*)context;
5475         unsigned long flags;
5476
5477         if ( debug_level >= DEBUG_LEVEL_INFO )
5478                 printk( "%s(%d):%s tx_timeout()\n",
5479                         __FILE__,__LINE__,info->device_name);
5480         if(info->tx_active && info->params.mode == MGSL_MODE_HDLC) {
5481                 info->icount.txtimeout++;
5482         }
5483         spin_lock_irqsave(&info->lock,flags);
5484         info->tx_active = false;
5485         info->tx_count = info->tx_put = info->tx_get = 0;
5486
5487         spin_unlock_irqrestore(&info->lock,flags);
5488
5489 #if SYNCLINK_GENERIC_HDLC
5490         if (info->netcount)
5491                 hdlcdev_tx_done(info);
5492         else
5493 #endif
5494                 bh_transmit(info);
5495 }
5496
5497 /* called to periodically check the DSR/RI modem signal input status
5498  */
5499 static void status_timeout(unsigned long context)
5500 {
5501         u16 status = 0;
5502         SLMP_INFO *info = (SLMP_INFO*)context;
5503         unsigned long flags;
5504         unsigned char delta;
5505
5506
5507         spin_lock_irqsave(&info->lock,flags);
5508         get_signals(info);
5509         spin_unlock_irqrestore(&info->lock,flags);
5510
5511         /* check for DSR/RI state change */
5512
5513         delta = info->old_signals ^ info->serial_signals;
5514         info->old_signals = info->serial_signals;
5515
5516         if (delta & SerialSignal_DSR)
5517                 status |= MISCSTATUS_DSR_LATCHED|(info->serial_signals&SerialSignal_DSR);
5518
5519         if (delta & SerialSignal_RI)
5520                 status |= MISCSTATUS_RI_LATCHED|(info->serial_signals&SerialSignal_RI);
5521
5522         if (delta & SerialSignal_DCD)
5523                 status |= MISCSTATUS_DCD_LATCHED|(info->serial_signals&SerialSignal_DCD);
5524
5525         if (delta & SerialSignal_CTS)
5526                 status |= MISCSTATUS_CTS_LATCHED|(info->serial_signals&SerialSignal_CTS);
5527
5528         if (status)
5529                 isr_io_pin(info,status);
5530
5531         mod_timer(&info->status_timer, jiffies + msecs_to_jiffies(10));
5532 }
5533
5534
5535 /* Register Access Routines -
5536  * All registers are memory mapped
5537  */
5538 #define CALC_REGADDR() \
5539         unsigned char * RegAddr = (unsigned char*)(info->sca_base + Addr); \
5540         if (info->port_num > 1) \
5541                 RegAddr += 256;                 /* port 0-1 SCA0, 2-3 SCA1 */ \
5542         if ( info->port_num & 1) { \
5543                 if (Addr > 0x7f) \
5544                         RegAddr += 0x40;        /* DMA access */ \
5545                 else if (Addr > 0x1f && Addr < 0x60) \
5546                         RegAddr += 0x20;        /* MSCI access */ \
5547         }
5548
5549
5550 static unsigned char read_reg(SLMP_INFO * info, unsigned char Addr)
5551 {
5552         CALC_REGADDR();
5553         return *RegAddr;
5554 }
5555 static void write_reg(SLMP_INFO * info, unsigned char Addr, unsigned char Value)
5556 {
5557         CALC_REGADDR();
5558         *RegAddr = Value;
5559 }
5560
5561 static u16 read_reg16(SLMP_INFO * info, unsigned char Addr)
5562 {
5563         CALC_REGADDR();
5564         return *((u16 *)RegAddr);
5565 }
5566
5567 static void write_reg16(SLMP_INFO * info, unsigned char Addr, u16 Value)
5568 {
5569         CALC_REGADDR();
5570         *((u16 *)RegAddr) = Value;
5571 }
5572
5573 static unsigned char read_status_reg(SLMP_INFO * info)
5574 {
5575         unsigned char *RegAddr = (unsigned char *)info->statctrl_base;
5576         return *RegAddr;
5577 }
5578
5579 static void write_control_reg(SLMP_INFO * info)
5580 {
5581         unsigned char *RegAddr = (unsigned char *)info->statctrl_base;
5582         *RegAddr = info->port_array[0]->ctrlreg_value;
5583 }
5584
5585
5586 static int synclinkmp_init_one (struct pci_dev *dev,
5587                                           const struct pci_device_id *ent)
5588 {
5589         if (pci_enable_device(dev)) {
5590                 printk("error enabling pci device %p\n", dev);
5591                 return -EIO;
5592         }
5593         return device_init( ++synclinkmp_adapter_count, dev );
5594 }
5595
5596 static void synclinkmp_remove_one (struct pci_dev *dev)
5597 {
5598 }