drivers/tty/mxser.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  *          mxser.c  -- MOXA Smartio/Industio family multiport serial driver.
   4  *
   5  *      Copyright (C) 1999-2006  Moxa Technologies (support@moxa.com).
   6  *      Copyright (C) 2006-2008  Jiri Slaby <jirislaby@gmail.com>
   7  *
   8  *      This code is loosely based on the 1.8 moxa driver which is based on
   9  *      Linux serial driver, written by Linus Torvalds, Theodore T'so and
  10  *      others.
  11  *
  12  *      Fed through a cleanup, indent and remove of non 2.6 code by Alan Cox
  13  *      <alan@lxorguk.ukuu.org.uk>. The original 1.8 code is available on
  14  *      www.moxa.com.
  15  *      - Fixed x86_64 cleanness
  16  */
  17
  18 #include <linux/module.h>
  19 #include <linux/errno.h>
  20 #include <linux/signal.h>
  21 #include <linux/sched.h>
  22 #include <linux/timer.h>
  23 #include <linux/interrupt.h>
  24 #include <linux/tty.h>
  25 #include <linux/tty_flip.h>
  26 #include <linux/serial.h>
  27 #include <linux/serial_reg.h>
  28 #include <linux/major.h>
  29 #include <linux/string.h>
  30 #include <linux/fcntl.h>
  31 #include <linux/ptrace.h>
  32 #include <linux/ioport.h>
  33 #include <linux/mm.h>
  34 #include <linux/delay.h>
  35 #include <linux/pci.h>
  36 #include <linux/bitops.h>
  37 #include <linux/slab.h>
  38 #include <linux/ratelimit.h>
  39
  40 #include <asm/io.h>
  41 #include <asm/irq.h>
  42 #include <linux/uaccess.h>
  43
  44 #include "mxser.h"
  45
  46 #define MXSER_VERSION   "2.0.5"         /* 1.14 */
  47 #define MXSERMAJOR       174
  48
  49 #define MXSER_BOARDS            4       /* Max. boards */
  50 #define MXSER_PORTS_PER_BOARD   8       /* Max. ports per board */
  51 #define MXSER_PORTS             (MXSER_BOARDS * MXSER_PORTS_PER_BOARD)
  52 #define MXSER_ISR_PASS_LIMIT    100
  53
  54 /*CheckIsMoxaMust return value*/
  55 #define MOXA_OTHER_UART         0x00
  56 #define MOXA_MUST_MU150_HWID    0x01
  57 #define MOXA_MUST_MU860_HWID    0x02
  58
  59 #define WAKEUP_CHARS            256
  60
  61 #define UART_MCR_AFE            0x20
  62 #define UART_LSR_SPECIAL        0x1E
  63
  64 #define PCI_DEVICE_ID_POS104UL  0x1044
  65 #define PCI_DEVICE_ID_CB108     0x1080
  66 #define PCI_DEVICE_ID_CP102UF   0x1023
  67 #define PCI_DEVICE_ID_CP112UL   0x1120
  68 #define PCI_DEVICE_ID_CB114     0x1142
  69 #define PCI_DEVICE_ID_CP114UL   0x1143
  70 #define PCI_DEVICE_ID_CB134I    0x1341
  71 #define PCI_DEVICE_ID_CP138U    0x1380
  72
  73
  74 #define C168_ASIC_ID    1
  75 #define C104_ASIC_ID    2
  76 #define C102_ASIC_ID    0xB
  77 #define CI132_ASIC_ID   4
  78 #define CI134_ASIC_ID   3
  79 #define CI104J_ASIC_ID  5
  80
  81 #define MXSER_HIGHBAUD  1
  82 #define MXSER_HAS2      2
  83
  84 /* This is only for PCI */
  85 static const struct {
  86         int type;
  87         int tx_fifo;
  88         int rx_fifo;
  89         int xmit_fifo_size;
  90         int rx_high_water;
  91         int rx_trigger;
  92         int rx_low_water;
  93         long max_baud;
  94 } Gpci_uart_info[] = {
  95         {MOXA_OTHER_UART, 16, 16, 16, 14, 14, 1, 921600L},
  96         {MOXA_MUST_MU150_HWID, 64, 64, 64, 48, 48, 16, 230400L},
  97         {MOXA_MUST_MU860_HWID, 128, 128, 128, 96, 96, 32, 921600L}
  98 };
  99 #define UART_INFO_NUM   ARRAY_SIZE(Gpci_uart_info)
 100
 101 struct mxser_cardinfo {
 102         char *name;
 103         unsigned int nports;
 104         unsigned int flags;
 105 };
 106
 107 static const struct mxser_cardinfo mxser_cards[] = {
 108 /* 0*/  { "C168 series",        8, },
 109         { "C104 series",        4, },
 110         { "CI-104J series",     4, },
 111         { "C168H/PCI series",   8, },
 112         { "C104H/PCI series",   4, },
 113 /* 5*/  { "C102 series",        4, MXSER_HAS2 },        /* C102-ISA */
 114         { "CI-132 series",      4, MXSER_HAS2 },
 115         { "CI-134 series",      4, },
 116         { "CP-132 series",      2, },
 117         { "CP-114 series",      4, },
 118 /*10*/  { "CT-114 series",      4, },
 119         { "CP-102 series",      2, MXSER_HIGHBAUD },
 120         { "CP-104U series",     4, },
 121         { "CP-168U series",     8, },
 122         { "CP-132U series",     2, },
 123 /*15*/  { "CP-134U series",     4, },
 124         { "CP-104JU series",    4, },
 125         { "Moxa UC7000 Serial", 8, },           /* RC7000 */
 126         { "CP-118U series",     8, },
 127         { "CP-102UL series",    2, },
 128 /*20*/  { "CP-102U series",     2, },
 129         { "CP-118EL series",    8, },
 130         { "CP-168EL series",    8, },
 131         { "CP-104EL series",    4, },
 132         { "CB-108 series",      8, },
 133 /*25*/  { "CB-114 series",      4, },
 134         { "CB-134I series",     4, },
 135         { "CP-138U series",     8, },
 136         { "POS-104UL series",   4, },
 137         { "CP-114UL series",    4, },
 138 /*30*/  { "CP-102UF series",    2, },
 139         { "CP-112UL series",    2, },
 140 };
 141
 142 /* driver_data correspond to the lines in the structure above
 143    see also ISA probe function before you change something */
 144 static const struct pci_device_id mxser_pcibrds[] = {
 145         { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_C168),   .driver_data = 3 },
 146         { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_C104),   .driver_data = 4 },
 147         { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_CP132),  .driver_data = 8 },
 148         { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_CP114),  .driver_data = 9 },
 149         { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_CT114),  .driver_data = 10 },
 150         { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_CP102),  .driver_data = 11 },
 151         { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_CP104U), .driver_data = 12 },
 152         { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_CP168U), .driver_data = 13 },
 153         { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_CP132U), .driver_data = 14 },
 154         { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_CP134U), .driver_data = 15 },
 155         { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_CP104JU),.driver_data = 16 },
 156         { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_RC7000), .driver_data = 17 },
 157         { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_CP118U), .driver_data = 18 },
 158         { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_CP102UL),.driver_data = 19 },
 159         { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_CP102U), .driver_data = 20 },
 160         { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_CP118EL),.driver_data = 21 },
 161         { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_CP168EL),.driver_data = 22 },
 162         { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_CP104EL),.driver_data = 23 },
 163         { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_CB108),       .driver_data = 24 },
 164         { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_CB114),       .driver_data = 25 },
 165         { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_CB134I),      .driver_data = 26 },
 166         { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_CP138U),      .driver_data = 27 },
 167         { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_POS104UL),    .driver_data = 28 },
 168         { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_CP114UL),     .driver_data = 29 },
 169         { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_CP102UF),     .driver_data = 30 },
 170         { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_CP112UL),     .driver_data = 31 },
 171         { }
 172 };
 173 MODULE_DEVICE_TABLE(pci, mxser_pcibrds);
 174
 175 static unsigned long ioaddr[MXSER_BOARDS];
 176 static int ttymajor = MXSERMAJOR;
 177
 178 /* Variables for insmod */
 179
 180 MODULE_AUTHOR("Casper Yang");
 181 MODULE_DESCRIPTION("MOXA Smartio/Industio Family Multiport Board Device Driver");
 182 module_param_hw_array(ioaddr, ulong, ioport, NULL, 0);
 183 MODULE_PARM_DESC(ioaddr, "ISA io addresses to look for a moxa board");
 184 module_param(ttymajor, int, 0);
 185 MODULE_LICENSE("GPL");
 186
 187 struct mxser_log {
 188         int tick;
 189         unsigned long rxcnt[MXSER_PORTS];
 190         unsigned long txcnt[MXSER_PORTS];
 191 };
 192
 193 struct mxser_mon {
 194         unsigned long rxcnt;
 195         unsigned long txcnt;
 196         unsigned long up_rxcnt;
 197         unsigned long up_txcnt;
 198         int modem_status;
 199         unsigned char hold_reason;
 200 };
 201
 202 struct mxser_mon_ext {
 203         unsigned long rx_cnt[32];
 204         unsigned long tx_cnt[32];
 205         unsigned long up_rxcnt[32];
 206         unsigned long up_txcnt[32];
 207         int modem_status[32];
 208
 209         long baudrate[32];
 210         int databits[32];
 211         int stopbits[32];
 212         int parity[32];
 213         int flowctrl[32];
 214         int fifo[32];
 215         int iftype[32];
 216 };
 217
 218 struct mxser_board;
 219
 220 struct mxser_port {
 221         struct tty_port port;
 222         struct mxser_board *board;
 223
 224         unsigned long ioaddr;
 225         unsigned long opmode_ioaddr;
 226         int max_baud;
 227
 228         int rx_high_water;
 229         int rx_trigger;         /* Rx fifo trigger level */
 230         int rx_low_water;
 231         int baud_base;          /* max. speed */
 232         int type;               /* UART type */
 233
 234         int x_char;             /* xon/xoff character */
 235         int IER;                /* Interrupt Enable Register */
 236         int MCR;                /* Modem control register */
 237
 238         unsigned char stop_rx;
 239         unsigned char ldisc_stop_rx;
 240
 241         int custom_divisor;
 242         unsigned char err_shadow;
 243
 244         struct async_icount icount; /* kernel counters for 4 input interrupts */
 245         unsigned int timeout;
 246
 247         int read_status_mask;
 248         int ignore_status_mask;
 249         unsigned int xmit_fifo_size;
 250         int xmit_head;
 251         int xmit_tail;
 252         int xmit_cnt;
 253         int closing;
 254
 255         struct ktermios normal_termios;
 256
 257         struct mxser_mon mon_data;
 258
 259         spinlock_t slock;
 260 };
 261
 262 struct mxser_board {
 263         unsigned int idx;
 264         int irq;
 265         const struct mxser_cardinfo *info;
 266         unsigned long vector;
 267         unsigned long vector_mask;
 268
 269         int chip_flag;
 270         int uart_type;
 271
 272         struct mxser_port ports[MXSER_PORTS_PER_BOARD];
 273 };
 274
 275 struct mxser_mstatus {
 276         tcflag_t cflag;
 277         int cts;
 278         int dsr;
 279         int ri;
 280         int dcd;
 281 };
 282
 283 static struct mxser_board mxser_boards[MXSER_BOARDS];
 284 static struct tty_driver *mxvar_sdriver;
 285 static struct mxser_log mxvar_log;
 286 static int mxser_set_baud_method[MXSER_PORTS + 1];
 287
 288 static void mxser_enable_must_enchance_mode(unsigned long baseio)
 289 {
 290         u8 oldlcr;
 291         u8 efr;
 292
 293         oldlcr = inb(baseio + UART_LCR);
 294         outb(MOXA_MUST_ENTER_ENCHANCE, baseio + UART_LCR);
 295
 296         efr = inb(baseio + MOXA_MUST_EFR_REGISTER);
 297         efr |= MOXA_MUST_EFR_EFRB_ENABLE;
 298
 299         outb(efr, baseio + MOXA_MUST_EFR_REGISTER);
 300         outb(oldlcr, baseio + UART_LCR);
 301 }
 302
 303 #ifdef  CONFIG_PCI
 304 static void mxser_disable_must_enchance_mode(unsigned long baseio)
 305 {
 306         u8 oldlcr;
 307         u8 efr;
 308
 309         oldlcr = inb(baseio + UART_LCR);
 310         outb(MOXA_MUST_ENTER_ENCHANCE, baseio + UART_LCR);
 311
 312         efr = inb(baseio + MOXA_MUST_EFR_REGISTER);
 313         efr &= ~MOXA_MUST_EFR_EFRB_ENABLE;
 314
 315         outb(efr, baseio + MOXA_MUST_EFR_REGISTER);
 316         outb(oldlcr, baseio + UART_LCR);
 317 }
 318 #endif
 319
 320 static void mxser_set_must_xon1_value(unsigned long baseio, u8 value)
 321 {
 322         u8 oldlcr;
 323         u8 efr;
 324
 325         oldlcr = inb(baseio + UART_LCR);
 326         outb(MOXA_MUST_ENTER_ENCHANCE, baseio + UART_LCR);
 327
 328         efr = inb(baseio + MOXA_MUST_EFR_REGISTER);
 329         efr &= ~MOXA_MUST_EFR_BANK_MASK;
 330         efr |= MOXA_MUST_EFR_BANK0;
 331
 332         outb(efr, baseio + MOXA_MUST_EFR_REGISTER);
 333         outb(value, baseio + MOXA_MUST_XON1_REGISTER);
 334         outb(oldlcr, baseio + UART_LCR);
 335 }
 336
 337 static void mxser_set_must_xoff1_value(unsigned long baseio, u8 value)
 338 {
 339         u8 oldlcr;
 340         u8 efr;
 341
 342         oldlcr = inb(baseio + UART_LCR);
 343         outb(MOXA_MUST_ENTER_ENCHANCE, baseio + UART_LCR);
 344
 345         efr = inb(baseio + MOXA_MUST_EFR_REGISTER);
 346         efr &= ~MOXA_MUST_EFR_BANK_MASK;
 347         efr |= MOXA_MUST_EFR_BANK0;
 348
 349         outb(efr, baseio + MOXA_MUST_EFR_REGISTER);
 350         outb(value, baseio + MOXA_MUST_XOFF1_REGISTER);
 351         outb(oldlcr, baseio + UART_LCR);
 352 }
 353
 354 static void mxser_set_must_fifo_value(struct mxser_port *info)
 355 {
 356         u8 oldlcr;
 357         u8 efr;
 358
 359         oldlcr = inb(info->ioaddr + UART_LCR);
 360         outb(MOXA_MUST_ENTER_ENCHANCE, info->ioaddr + UART_LCR);
 361
 362         efr = inb(info->ioaddr + MOXA_MUST_EFR_REGISTER);
 363         efr &= ~MOXA_MUST_EFR_BANK_MASK;
 364         efr |= MOXA_MUST_EFR_BANK1;
 365
 366         outb(efr, info->ioaddr + MOXA_MUST_EFR_REGISTER);
 367         outb((u8)info->rx_high_water, info->ioaddr + MOXA_MUST_RBRTH_REGISTER);
 368         outb((u8)info->rx_trigger, info->ioaddr + MOXA_MUST_RBRTI_REGISTER);
 369         outb((u8)info->rx_low_water, info->ioaddr + MOXA_MUST_RBRTL_REGISTER);
 370         outb(oldlcr, info->ioaddr + UART_LCR);
 371 }
 372
 373 static void mxser_set_must_enum_value(unsigned long baseio, u8 value)
 374 {
 375         u8 oldlcr;
 376         u8 efr;
 377
 378         oldlcr = inb(baseio + UART_LCR);
 379         outb(MOXA_MUST_ENTER_ENCHANCE, baseio + UART_LCR);
 380
 381         efr = inb(baseio + MOXA_MUST_EFR_REGISTER);
 382         efr &= ~MOXA_MUST_EFR_BANK_MASK;
 383         efr |= MOXA_MUST_EFR_BANK2;
 384
 385         outb(efr, baseio + MOXA_MUST_EFR_REGISTER);
 386         outb(value, baseio + MOXA_MUST_ENUM_REGISTER);
 387         outb(oldlcr, baseio + UART_LCR);
 388 }
 389
 390 #ifdef CONFIG_PCI
 391 static void mxser_get_must_hardware_id(unsigned long baseio, u8 *pId)
 392 {
 393         u8 oldlcr;
 394         u8 efr;
 395
 396         oldlcr = inb(baseio + UART_LCR);
 397         outb(MOXA_MUST_ENTER_ENCHANCE, baseio + UART_LCR);
 398
 399         efr = inb(baseio + MOXA_MUST_EFR_REGISTER);
 400         efr &= ~MOXA_MUST_EFR_BANK_MASK;
 401         efr |= MOXA_MUST_EFR_BANK2;
 402
 403         outb(efr, baseio + MOXA_MUST_EFR_REGISTER);
 404         *pId = inb(baseio + MOXA_MUST_HWID_REGISTER);
 405         outb(oldlcr, baseio + UART_LCR);
 406 }
 407 #endif
 408
 409 static void SET_MOXA_MUST_NO_SOFTWARE_FLOW_CONTROL(unsigned long baseio)
 410 {
 411         u8 oldlcr;
 412         u8 efr;
 413
 414         oldlcr = inb(baseio + UART_LCR);
 415         outb(MOXA_MUST_ENTER_ENCHANCE, baseio + UART_LCR);
 416
 417         efr = inb(baseio + MOXA_MUST_EFR_REGISTER);
 418         efr &= ~MOXA_MUST_EFR_SF_MASK;
 419
 420         outb(efr, baseio + MOXA_MUST_EFR_REGISTER);
 421         outb(oldlcr, baseio + UART_LCR);
 422 }
 423
 424 static void mxser_enable_must_tx_software_flow_control(unsigned long baseio)
 425 {
 426         u8 oldlcr;
 427         u8 efr;
 428
 429         oldlcr = inb(baseio + UART_LCR);
 430         outb(MOXA_MUST_ENTER_ENCHANCE, baseio + UART_LCR);
 431
 432         efr = inb(baseio + MOXA_MUST_EFR_REGISTER);
 433         efr &= ~MOXA_MUST_EFR_SF_TX_MASK;
 434         efr |= MOXA_MUST_EFR_SF_TX1;
 435
 436         outb(efr, baseio + MOXA_MUST_EFR_REGISTER);
 437         outb(oldlcr, baseio + UART_LCR);
 438 }
 439
 440 static void mxser_disable_must_tx_software_flow_control(unsigned long baseio)
 441 {
 442         u8 oldlcr;
 443         u8 efr;
 444
 445         oldlcr = inb(baseio + UART_LCR);
 446         outb(MOXA_MUST_ENTER_ENCHANCE, baseio + UART_LCR);
 447
 448         efr = inb(baseio + MOXA_MUST_EFR_REGISTER);
 449         efr &= ~MOXA_MUST_EFR_SF_TX_MASK;
 450
 451         outb(efr, baseio + MOXA_MUST_EFR_REGISTER);
 452         outb(oldlcr, baseio + UART_LCR);
 453 }
 454
 455 static void mxser_enable_must_rx_software_flow_control(unsigned long baseio)
 456 {
 457         u8 oldlcr;
 458         u8 efr;
 459
 460         oldlcr = inb(baseio + UART_LCR);
 461         outb(MOXA_MUST_ENTER_ENCHANCE, baseio + UART_LCR);
 462
 463         efr = inb(baseio + MOXA_MUST_EFR_REGISTER);
 464         efr &= ~MOXA_MUST_EFR_SF_RX_MASK;
 465         efr |= MOXA_MUST_EFR_SF_RX1;
 466
 467         outb(efr, baseio + MOXA_MUST_EFR_REGISTER);
 468         outb(oldlcr, baseio + UART_LCR);
 469 }
 470
 471 static void mxser_disable_must_rx_software_flow_control(unsigned long baseio)
 472 {
 473         u8 oldlcr;
 474         u8 efr;
 475
 476         oldlcr = inb(baseio + UART_LCR);
 477         outb(MOXA_MUST_ENTER_ENCHANCE, baseio + UART_LCR);
 478
 479         efr = inb(baseio + MOXA_MUST_EFR_REGISTER);
 480         efr &= ~MOXA_MUST_EFR_SF_RX_MASK;
 481
 482         outb(efr, baseio + MOXA_MUST_EFR_REGISTER);
 483         outb(oldlcr, baseio + UART_LCR);
 484 }
 485
 486 #ifdef CONFIG_PCI
 487 static int CheckIsMoxaMust(unsigned long io)
 488 {
 489         u8 oldmcr, hwid;
 490         int i;
 491
 492         outb(0, io + UART_LCR);
 493         mxser_disable_must_enchance_mode(io);
 494         oldmcr = inb(io + UART_MCR);
 495         outb(0, io + UART_MCR);
 496         mxser_set_must_xon1_value(io, 0x11);
 497         if ((hwid = inb(io + UART_MCR)) != 0) {
 498                 outb(oldmcr, io + UART_MCR);
 499                 return MOXA_OTHER_UART;
 500         }
 501
 502         mxser_get_must_hardware_id(io, &hwid);
 503         for (i = 1; i < UART_INFO_NUM; i++) { /* 0 = OTHER_UART */
 504                 if (hwid == Gpci_uart_info[i].type)
 505                         return (int)hwid;
 506         }
 507         return MOXA_OTHER_UART;
 508 }
 509 #endif
 510
 511 static void process_txrx_fifo(struct mxser_port *info)
 512 {
 513         int i;
 514
 515         if ((info->type == PORT_16450) || (info->type == PORT_8250)) {
 516                 info->rx_trigger = 1;
 517                 info->rx_high_water = 1;
 518                 info->rx_low_water = 1;
 519                 info->xmit_fifo_size = 1;
 520         } else
 521                 for (i = 0; i < UART_INFO_NUM; i++)
 522                         if (info->board->chip_flag == Gpci_uart_info[i].type) {
 523                                 info->rx_trigger = Gpci_uart_info[i].rx_trigger;
 524                                 info->rx_low_water = Gpci_uart_info[i].rx_low_water;
 525                                 info->rx_high_water = Gpci_uart_info[i].rx_high_water;
 526                                 info->xmit_fifo_size = Gpci_uart_info[i].xmit_fifo_size;
 527                                 break;
 528                         }
 529 }
 530
 531 static unsigned char mxser_get_msr(int baseaddr, int mode, int port)
 532 {
 533         static unsigned char mxser_msr[MXSER_PORTS + 1];
 534         unsigned char status = 0;
 535
 536         status = inb(baseaddr + UART_MSR);
 537
 538         mxser_msr[port] &= 0x0F;
 539         mxser_msr[port] |= status;
 540         status = mxser_msr[port];
 541         if (mode)
 542                 mxser_msr[port] = 0;
 543
 544         return status;
 545 }
 546
 547 static int mxser_carrier_raised(struct tty_port *port)
 548 {
 549         struct mxser_port *mp = container_of(port, struct mxser_port, port);
 550         return (inb(mp->ioaddr + UART_MSR) & UART_MSR_DCD)?1:0;
 551 }
 552
 553 static void mxser_dtr_rts(struct tty_port *port, int on)
 554 {
 555         struct mxser_port *mp = container_of(port, struct mxser_port, port);
 556         unsigned long flags;
 557
 558         spin_lock_irqsave(&mp->slock, flags);
 559         if (on)
 560                 outb(inb(mp->ioaddr + UART_MCR) |
 561                         UART_MCR_DTR | UART_MCR_RTS, mp->ioaddr + UART_MCR);
 562         else
 563                 outb(inb(mp->ioaddr + UART_MCR)&~(UART_MCR_DTR | UART_MCR_RTS),
 564                         mp->ioaddr + UART_MCR);
 565         spin_unlock_irqrestore(&mp->slock, flags);
 566 }
 567
 568 static int mxser_set_baud(struct tty_struct *tty, long newspd)
 569 {
 570         struct mxser_port *info = tty->driver_data;
 571         unsigned int quot = 0, baud;
 572         unsigned char cval;
 573         u64 timeout;
 574
 575         if (!info->ioaddr)
 576                 return -1;
 577
 578         if (newspd > info->max_baud)
 579                 return -1;
 580
 581         if (newspd == 134) {
 582                 quot = 2 * info->baud_base / 269;
 583                 tty_encode_baud_rate(tty, 134, 134);
 584         } else if (newspd) {
 585                 quot = info->baud_base / newspd;
 586                 if (quot == 0)
 587                         quot = 1;
 588                 baud = info->baud_base/quot;
 589                 tty_encode_baud_rate(tty, baud, baud);
 590         } else {
 591                 quot = 0;
 592         }
 593
 594         /*
 595          * worst case (128 * 1000 * 10 * 18432) needs 35 bits, so divide in the
 596          * u64 domain
 597          */
 598         timeout = (u64)info->xmit_fifo_size * HZ * 10 * quot;
 599         do_div(timeout, info->baud_base);
 600         info->timeout = timeout + HZ / 50; /* Add .02 seconds of slop */
 601
 602         if (quot) {
 603                 info->MCR |= UART_MCR_DTR;
 604                 outb(info->MCR, info->ioaddr + UART_MCR);
 605         } else {
 606                 info->MCR &= ~UART_MCR_DTR;
 607                 outb(info->MCR, info->ioaddr + UART_MCR);
 608                 return 0;
 609         }
 610
 611         cval = inb(info->ioaddr + UART_LCR);
 612
 613         outb(cval | UART_LCR_DLAB, info->ioaddr + UART_LCR);    /* set DLAB */
 614
 615         outb(quot & 0xff, info->ioaddr + UART_DLL);     /* LS of divisor */
 616         outb(quot >> 8, info->ioaddr + UART_DLM);       /* MS of divisor */
 617         outb(cval, info->ioaddr + UART_LCR);    /* reset DLAB */
 618
 619 #ifdef BOTHER
 620         if (C_BAUD(tty) == BOTHER) {
 621                 quot = info->baud_base % newspd;
 622                 quot *= 8;
 623                 if (quot % newspd > newspd / 2) {
 624                         quot /= newspd;
 625                         quot++;
 626                 } else
 627                         quot /= newspd;
 628
 629                 mxser_set_must_enum_value(info->ioaddr, quot);
 630         } else
 631 #endif
 632                 mxser_set_must_enum_value(info->ioaddr, 0);
 633
 634         return 0;
 635 }
 636
 637 /*
 638  * This routine is called to set the UART divisor registers to match
 639  * the specified baud rate for a serial port.
 640  */
 641 static int mxser_change_speed(struct tty_struct *tty)
 642 {
 643         struct mxser_port *info = tty->driver_data;
 644         unsigned cflag, cval, fcr;
 645         int ret = 0;
 646         unsigned char status;
 647
 648         cflag = tty->termios.c_cflag;
 649         if (!info->ioaddr)
 650                 return ret;
 651
 652         if (mxser_set_baud_method[tty->index] == 0)
 653                 mxser_set_baud(tty, tty_get_baud_rate(tty));
 654
 655         /* byte size and parity */
 656         switch (cflag & CSIZE) {
 657         case CS5:
 658                 cval = 0x00;
 659                 break;
 660         case CS6:
 661                 cval = 0x01;
 662                 break;
 663         case CS7:
 664                 cval = 0x02;
 665                 break;
 666         case CS8:
 667                 cval = 0x03;
 668                 break;
 669         default:
 670                 cval = 0x00;
 671                 break;          /* too keep GCC shut... */
 672         }
 673         if (cflag & CSTOPB)
 674                 cval |= 0x04;
 675         if (cflag & PARENB)
 676                 cval |= UART_LCR_PARITY;
 677         if (!(cflag & PARODD))
 678                 cval |= UART_LCR_EPAR;
 679         if (cflag & CMSPAR)
 680                 cval |= UART_LCR_SPAR;
 681
 682         if ((info->type == PORT_8250) || (info->type == PORT_16450)) {
 683                 if (info->board->chip_flag) {
 684                         fcr = UART_FCR_ENABLE_FIFO;
 685                         fcr |= MOXA_MUST_FCR_GDA_MODE_ENABLE;
 686                         mxser_set_must_fifo_value(info);
 687                 } else
 688                         fcr = 0;
 689         } else {
 690                 fcr = UART_FCR_ENABLE_FIFO;
 691                 if (info->board->chip_flag) {
 692                         fcr |= MOXA_MUST_FCR_GDA_MODE_ENABLE;
 693                         mxser_set_must_fifo_value(info);
 694                 } else {
 695                         switch (info->rx_trigger) {
 696                         case 1:
 697                                 fcr |= UART_FCR_TRIGGER_1;
 698                                 break;
 699                         case 4:
 700                                 fcr |= UART_FCR_TRIGGER_4;
 701                                 break;
 702                         case 8:
 703                                 fcr |= UART_FCR_TRIGGER_8;
 704                                 break;
 705                         default:
 706                                 fcr |= UART_FCR_TRIGGER_14;
 707                                 break;
 708                         }
 709                 }
 710         }
 711
 712         /* CTS flow control flag and modem status interrupts */
 713         info->IER &= ~UART_IER_MSI;
 714         info->MCR &= ~UART_MCR_AFE;
 715         tty_port_set_cts_flow(&info->port, cflag & CRTSCTS);
 716         if (cflag & CRTSCTS) {
 717                 info->IER |= UART_IER_MSI;
 718                 if ((info->type == PORT_16550A) || (info->board->chip_flag)) {
 719                         info->MCR |= UART_MCR_AFE;
 720                 } else {
 721                         status = inb(info->ioaddr + UART_MSR);
 722                         if (tty->hw_stopped) {
 723                                 if (status & UART_MSR_CTS) {
 724                                         tty->hw_stopped = 0;
 725                                         if (info->type != PORT_16550A &&
 726                                                         !info->board->chip_flag) {
 727                                                 outb(info->IER & ~UART_IER_THRI,
 728                                                         info->ioaddr +
 729                                                         UART_IER);
 730                                                 info->IER |= UART_IER_THRI;
 731                                                 outb(info->IER, info->ioaddr +
 732                                                                 UART_IER);
 733                                         }
 734                                         tty_wakeup(tty);
 735                                 }
 736                         } else {
 737                                 if (!(status & UART_MSR_CTS)) {
 738                                         tty->hw_stopped = 1;
 739                                         if ((info->type != PORT_16550A) &&
 740                                                         (!info->board->chip_flag)) {
 741                                                 info->IER &= ~UART_IER_THRI;
 742                                                 outb(info->IER, info->ioaddr +
 743                                                                 UART_IER);
 744                                         }
 745                                 }
 746                         }
 747                 }
 748         }
 749         outb(info->MCR, info->ioaddr + UART_MCR);
 750         tty_port_set_check_carrier(&info->port, ~cflag & CLOCAL);
 751         if (~cflag & CLOCAL)
 752                 info->IER |= UART_IER_MSI;
 753         outb(info->IER, info->ioaddr + UART_IER);
 754
 755         /*
 756          * Set up parity check flag
 757          */
 758         info->read_status_mask = UART_LSR_OE | UART_LSR_THRE | UART_LSR_DR;
 759         if (I_INPCK(tty))
 760                 info->read_status_mask |= UART_LSR_FE | UART_LSR_PE;
 761         if (I_BRKINT(tty) || I_PARMRK(tty))
 762                 info->read_status_mask |= UART_LSR_BI;
 763
 764         info->ignore_status_mask = 0;
 765
 766         if (I_IGNBRK(tty)) {
 767                 info->ignore_status_mask |= UART_LSR_BI;
 768                 info->read_status_mask |= UART_LSR_BI;
 769                 /*
 770                  * If we're ignore parity and break indicators, ignore
 771                  * overruns too.  (For real raw support).
 772                  */
 773                 if (I_IGNPAR(tty)) {
 774                         info->ignore_status_mask |=
 775                                                 UART_LSR_OE |
 776                                                 UART_LSR_PE |
 777                                                 UART_LSR_FE;
 778                         info->read_status_mask |=
 779                                                 UART_LSR_OE |
 780                                                 UART_LSR_PE |
 781                                                 UART_LSR_FE;
 782                 }
 783         }
 784         if (info->board->chip_flag) {
 785                 mxser_set_must_xon1_value(info->ioaddr, START_CHAR(tty));
 786                 mxser_set_must_xoff1_value(info->ioaddr, STOP_CHAR(tty));
 787                 if (I_IXON(tty)) {
 788                         mxser_enable_must_rx_software_flow_control(
 789                                         info->ioaddr);
 790                 } else {
 791                         mxser_disable_must_rx_software_flow_control(
 792                                         info->ioaddr);
 793                 }
 794                 if (I_IXOFF(tty)) {
 795                         mxser_enable_must_tx_software_flow_control(
 796                                         info->ioaddr);
 797                 } else {
 798                         mxser_disable_must_tx_software_flow_control(
 799                                         info->ioaddr);
 800                 }
 801         }
 802
 803
 804         outb(fcr, info->ioaddr + UART_FCR);     /* set fcr */
 805         outb(cval, info->ioaddr + UART_LCR);
 806
 807         return ret;
 808 }
 809
 810 static void mxser_check_modem_status(struct tty_struct *tty,
 811                                 struct mxser_port *port, int status)
 812 {
 813         /* update input line counters */
 814         if (status & UART_MSR_TERI)
 815                 port->icount.rng++;
 816         if (status & UART_MSR_DDSR)
 817                 port->icount.dsr++;
 818         if (status & UART_MSR_DDCD)
 819                 port->icount.dcd++;
 820         if (status & UART_MSR_DCTS)
 821                 port->icount.cts++;
 822         port->mon_data.modem_status = status;
 823         wake_up_interruptible(&port->port.delta_msr_wait);
 824
 825         if (tty_port_check_carrier(&port->port) && (status & UART_MSR_DDCD)) {
 826                 if (status & UART_MSR_DCD)
 827                         wake_up_interruptible(&port->port.open_wait);
 828         }
 829
 830         if (tty_port_cts_enabled(&port->port)) {
 831                 if (tty->hw_stopped) {
 832                         if (status & UART_MSR_CTS) {
 833                                 tty->hw_stopped = 0;
 834
 835                                 if ((port->type != PORT_16550A) &&
 836                                                 (!port->board->chip_flag)) {
 837                                         outb(port->IER & ~UART_IER_THRI,
 838                                                 port->ioaddr + UART_IER);
 839                                         port->IER |= UART_IER_THRI;
 840                                         outb(port->IER, port->ioaddr +
 841                                                         UART_IER);
 842                                 }
 843                                 tty_wakeup(tty);
 844                         }
 845                 } else {
 846                         if (!(status & UART_MSR_CTS)) {
 847                                 tty->hw_stopped = 1;
 848                                 if (port->type != PORT_16550A &&
 849                                                 !port->board->chip_flag) {
 850                                         port->IER &= ~UART_IER_THRI;
 851                                         outb(port->IER, port->ioaddr +
 852                                                         UART_IER);
 853                                 }
 854                         }
 855                 }
 856         }
 857 }
 858
 859 static int mxser_activate(struct tty_port *port, struct tty_struct *tty)
 860 {
 861         struct mxser_port *info = container_of(port, struct mxser_port, port);
 862         unsigned long page;
 863         unsigned long flags;
 864
 865         page = __get_free_page(GFP_KERNEL);
 866         if (!page)
 867                 return -ENOMEM;
 868
 869         spin_lock_irqsave(&info->slock, flags);
 870
 871         if (!info->ioaddr || !info->type) {
 872                 set_bit(TTY_IO_ERROR, &tty->flags);
 873                 free_page(page);
 874                 spin_unlock_irqrestore(&info->slock, flags);
 875                 return 0;
 876         }
 877         info->port.xmit_buf = (unsigned char *) page;
 878
 879         /*
 880          * Clear the FIFO buffers and disable them
 881          * (they will be reenabled in mxser_change_speed())
 882          */
 883         if (info->board->chip_flag)
 884                 outb((UART_FCR_CLEAR_RCVR |
 885                         UART_FCR_CLEAR_XMIT |
 886                         MOXA_MUST_FCR_GDA_MODE_ENABLE), info->ioaddr + UART_FCR);
 887         else
 888                 outb((UART_FCR_CLEAR_RCVR | UART_FCR_CLEAR_XMIT),
 889                         info->ioaddr + UART_FCR);
 890
 891         /*
 892          * At this point there's no way the LSR could still be 0xFF;
 893          * if it is, then bail out, because there's likely no UART
 894          * here.
 895          */
 896         if (inb(info->ioaddr + UART_LSR) == 0xff) {
 897                 spin_unlock_irqrestore(&info->slock, flags);
 898                 if (capable(CAP_SYS_ADMIN)) {
 899                         set_bit(TTY_IO_ERROR, &tty->flags);
 900                         return 0;
 901                 } else
 902                         return -ENODEV;
 903         }
 904
 905         /*
 906          * Clear the interrupt registers.
 907          */
 908         (void) inb(info->ioaddr + UART_LSR);
 909         (void) inb(info->ioaddr + UART_RX);
 910         (void) inb(info->ioaddr + UART_IIR);
 911         (void) inb(info->ioaddr + UART_MSR);
 912
 913         /*
 914          * Now, initialize the UART
 915          */
 916         outb(UART_LCR_WLEN8, info->ioaddr + UART_LCR);  /* reset DLAB */
 917         info->MCR = UART_MCR_DTR | UART_MCR_RTS;
 918         outb(info->MCR, info->ioaddr + UART_MCR);
 919
 920         /*
 921          * Finally, enable interrupts
 922          */
 923         info->IER = UART_IER_MSI | UART_IER_RLSI | UART_IER_RDI;
 924
 925         if (info->board->chip_flag)
 926                 info->IER |= MOXA_MUST_IER_EGDAI;
 927         outb(info->IER, info->ioaddr + UART_IER);       /* enable interrupts */
 928
 929         /*
 930          * And clear the interrupt registers again for luck.
 931          */
 932         (void) inb(info->ioaddr + UART_LSR);
 933         (void) inb(info->ioaddr + UART_RX);
 934         (void) inb(info->ioaddr + UART_IIR);
 935         (void) inb(info->ioaddr + UART_MSR);
 936
 937         clear_bit(TTY_IO_ERROR, &tty->flags);
 938         info->xmit_cnt = info->xmit_head = info->xmit_tail = 0;
 939
 940         /*
 941          * and set the speed of the serial port
 942          */
 943         mxser_change_speed(tty);
 944         spin_unlock_irqrestore(&info->slock, flags);
 945
 946         return 0;
 947 }
 948
 949 /*
 950  * This routine will shutdown a serial port
 951  */
 952 static void mxser_shutdown_port(struct tty_port *port)
 953 {
 954         struct mxser_port *info = container_of(port, struct mxser_port, port);
 955         unsigned long flags;
 956
 957         spin_lock_irqsave(&info->slock, flags);
 958
 959         /*
 960          * clear delta_msr_wait queue to avoid mem leaks: we may free the irq
 961          * here so the queue might never be waken up
 962          */
 963         wake_up_interruptible(&info->port.delta_msr_wait);
 964
 965         /*
 966          * Free the xmit buffer, if necessary
 967          */
 968         if (info->port.xmit_buf) {
 969                 free_page((unsigned long) info->port.xmit_buf);
 970                 info->port.xmit_buf = NULL;
 971         }
 972
 973         info->IER = 0;
 974         outb(0x00, info->ioaddr + UART_IER);
 975
 976         /* clear Rx/Tx FIFO's */
 977         if (info->board->chip_flag)
 978                 outb(UART_FCR_CLEAR_RCVR | UART_FCR_CLEAR_XMIT |
 979                                 MOXA_MUST_FCR_GDA_MODE_ENABLE,
 980                                 info->ioaddr + UART_FCR);
 981         else
 982                 outb(UART_FCR_CLEAR_RCVR | UART_FCR_CLEAR_XMIT,
 983                         info->ioaddr + UART_FCR);
 984
 985         /* read data port to reset things */
 986         (void) inb(info->ioaddr + UART_RX);
 987
 988
 989         if (info->board->chip_flag)
 990                 SET_MOXA_MUST_NO_SOFTWARE_FLOW_CONTROL(info->ioaddr);
 991
 992         spin_unlock_irqrestore(&info->slock, flags);
 993 }
 994
 995 /*
 996  * This routine is called whenever a serial port is opened.  It
 997  * enables interrupts for a serial port, linking in its async structure into
 998  * the IRQ chain.   It also performs the serial-specific
 999  * initialization for the tty structure.
1000  */
1001 static int mxser_open(struct tty_struct *tty, struct file *filp)
1002 {
1003         struct mxser_port *info;
1004         int line;
1005
1006         line = tty->index;
1007         if (line == MXSER_PORTS)
1008                 return 0;
1009         info = &mxser_boards[line / MXSER_PORTS_PER_BOARD].ports[line % MXSER_PORTS_PER_BOARD];
1010         if (!info->ioaddr)
1011                 return -ENODEV;
1012
1013         tty->driver_data = info;
1014         return tty_port_open(&info->port, tty, filp);
1015 }
1016
1017 static void mxser_flush_buffer(struct tty_struct *tty)
1018 {
1019         struct mxser_port *info = tty->driver_data;
1020         char fcr;
1021         unsigned long flags;
1022
1023
1024         spin_lock_irqsave(&info->slock, flags);
1025         info->xmit_cnt = info->xmit_head = info->xmit_tail = 0;
1026
1027         fcr = inb(info->ioaddr + UART_FCR);
1028         outb((fcr | UART_FCR_CLEAR_RCVR | UART_FCR_CLEAR_XMIT),
1029                 info->ioaddr + UART_FCR);
1030         outb(fcr, info->ioaddr + UART_FCR);
1031
1032         spin_unlock_irqrestore(&info->slock, flags);
1033
1034         tty_wakeup(tty);
1035 }
1036
1037
1038 static void mxser_close_port(struct tty_port *port)
1039 {
1040         struct mxser_port *info = container_of(port, struct mxser_port, port);
1041         unsigned long timeout;
1042         /*
1043          * At this point we stop accepting input.  To do this, we
1044          * disable the receive line status interrupts, and tell the
1045          * interrupt driver to stop checking the data ready bit in the
1046          * line status register.
1047          */
1048         info->IER &= ~UART_IER_RLSI;
1049         if (info->board->chip_flag)
1050                 info->IER &= ~MOXA_MUST_RECV_ISR;
1051
1052         outb(info->IER, info->ioaddr + UART_IER);
1053         /*
1054          * Before we drop DTR, make sure the UART transmitter
1055          * has completely drained; this is especially
1056          * important if there is a transmit FIFO!
1057          */
1058         timeout = jiffies + HZ;
1059         while (!(inb(info->ioaddr + UART_LSR) & UART_LSR_TEMT)) {
1060                 schedule_timeout_interruptible(5);
1061                 if (time_after(jiffies, timeout))
1062                         break;
1063         }
1064 }
1065
1066 /*
1067  * This routine is called when the serial port gets closed.  First, we
1068  * wait for the last remaining data to be sent.  Then, we unlink its
1069  * async structure from the interrupt chain if necessary, and we free
1070  * that IRQ if nothing is left in the chain.
1071  */
1072 static void mxser_close(struct tty_struct *tty, struct file *filp)
1073 {
1074         struct mxser_port *info = tty->driver_data;
1075         struct tty_port *port = &info->port;
1076
1077         if (tty->index == MXSER_PORTS || info == NULL)
1078                 return;
1079         if (tty_port_close_start(port, tty, filp) == 0)
1080                 return;
1081         info->closing = 1;
1082         mutex_lock(&port->mutex);
1083         mxser_close_port(port);
1084         mxser_flush_buffer(tty);
1085         if (tty_port_initialized(port) && C_HUPCL(tty))
1086                 tty_port_lower_dtr_rts(port);
1087         mxser_shutdown_port(port);
1088         tty_port_set_initialized(port, 0);
1089         mutex_unlock(&port->mutex);
1090         info->closing = 0;
1091         /* Right now the tty_port set is done outside of the close_end helper
1092            as we don't yet have everyone using refcounts */
1093         tty_port_close_end(port, tty);
1094         tty_port_tty_set(port, NULL);
1095 }
1096
1097 static int mxser_write(struct tty_struct *tty, const unsigned char *buf, int count)
1098 {
1099         int c, total = 0;
1100         struct mxser_port *info = tty->driver_data;
1101         unsigned long flags;
1102
1103         if (!info->port.xmit_buf)
1104                 return 0;
1105
1106         while (1) {
1107                 c = min_t(int, count, min(SERIAL_XMIT_SIZE - info->xmit_cnt - 1,
1108                                           SERIAL_XMIT_SIZE - info->xmit_head));
1109                 if (c <= 0)
1110                         break;
1111
1112                 memcpy(info->port.xmit_buf + info->xmit_head, buf, c);
1113                 spin_lock_irqsave(&info->slock, flags);
1114                 info->xmit_head = (info->xmit_head + c) &
1115                                   (SERIAL_XMIT_SIZE - 1);
1116                 info->xmit_cnt += c;
1117                 spin_unlock_irqrestore(&info->slock, flags);
1118
1119                 buf += c;
1120                 count -= c;
1121                 total += c;
1122         }
1123
1124         if (info->xmit_cnt && !tty->stopped) {
1125                 if (!tty->hw_stopped ||
1126                                 (info->type == PORT_16550A) ||
1127                                 (info->board->chip_flag)) {
1128                         spin_lock_irqsave(&info->slock, flags);
1129                         outb(info->IER & ~UART_IER_THRI, info->ioaddr +
1130                                         UART_IER);
1131                         info->IER |= UART_IER_THRI;
1132                         outb(info->IER, info->ioaddr + UART_IER);
1133                         spin_unlock_irqrestore(&info->slock, flags);
1134                 }
1135         }
1136         return total;
1137 }
1138
1139 static int mxser_put_char(struct tty_struct *tty, unsigned char ch)
1140 {
1141         struct mxser_port *info = tty->driver_data;
1142         unsigned long flags;
1143
1144         if (!info->port.xmit_buf)
1145                 return 0;
1146
1147         if (info->xmit_cnt >= SERIAL_XMIT_SIZE - 1)
1148                 return 0;
1149
1150         spin_lock_irqsave(&info->slock, flags);
1151         info->port.xmit_buf[info->xmit_head++] = ch;
1152         info->xmit_head &= SERIAL_XMIT_SIZE - 1;
1153         info->xmit_cnt++;
1154         spin_unlock_irqrestore(&info->slock, flags);
1155         if (!tty->stopped) {
1156                 if (!tty->hw_stopped ||
1157                                 (info->type == PORT_16550A) ||
1158                                 info->board->chip_flag) {
1159                         spin_lock_irqsave(&info->slock, flags);
1160                         outb(info->IER & ~UART_IER_THRI, info->ioaddr + UART_IER);
1161                         info->IER |= UART_IER_THRI;
1162                         outb(info->IER, info->ioaddr + UART_IER);
1163                         spin_unlock_irqrestore(&info->slock, flags);
1164                 }
1165         }
1166         return 1;
1167 }
1168
1169
1170 static void mxser_flush_chars(struct tty_struct *tty)
1171 {
1172         struct mxser_port *info = tty->driver_data;
1173         unsigned long flags;
1174
1175         if (info->xmit_cnt <= 0 || tty->stopped || !info->port.xmit_buf ||
1176                         (tty->hw_stopped && info->type != PORT_16550A &&
1177                          !info->board->chip_flag))
1178                 return;
1179
1180         spin_lock_irqsave(&info->slock, flags);
1181
1182         outb(info->IER & ~UART_IER_THRI, info->ioaddr + UART_IER);
1183         info->IER |= UART_IER_THRI;
1184         outb(info->IER, info->ioaddr + UART_IER);
1185
1186         spin_unlock_irqrestore(&info->slock, flags);
1187 }
1188
1189 static int mxser_write_room(struct tty_struct *tty)
1190 {
1191         struct mxser_port *info = tty->driver_data;
1192         int ret;
1193
1194         ret = SERIAL_XMIT_SIZE - info->xmit_cnt - 1;
1195         return ret < 0 ? 0 : ret;
1196 }
1197
1198 static int mxser_chars_in_buffer(struct tty_struct *tty)
1199 {
1200         struct mxser_port *info = tty->driver_data;
1201         return info->xmit_cnt;
1202 }
1203
1204 /*
1205  * ------------------------------------------------------------
1206  * friends of mxser_ioctl()
1207  * ------------------------------------------------------------
1208  */
1209 static int mxser_get_serial_info(struct tty_struct *tty,
1210                 struct serial_struct *ss)
1211 {
1212         struct mxser_port *info = tty->driver_data;
1213         struct tty_port *port = &info->port;
1214
1215         if (tty->index == MXSER_PORTS)
1216                 return -ENOTTY;
1217
1218         mutex_lock(&port->mutex);
1219         ss->type = info->type,
1220         ss->line = tty->index,
1221         ss->port = info->ioaddr,
1222         ss->irq = info->board->irq,
1223         ss->flags = info->port.flags,
1224         ss->baud_base = info->baud_base,
1225         ss->close_delay = info->port.close_delay,
1226         ss->closing_wait = info->port.closing_wait,
1227         ss->custom_divisor = info->custom_divisor,
1228         mutex_unlock(&port->mutex);
1229         return 0;
1230 }
1231
1232 static int mxser_set_serial_info(struct tty_struct *tty,
1233                 struct serial_struct *ss)
1234 {
1235         struct mxser_port *info = tty->driver_data;
1236         struct tty_port *port = &info->port;
1237         speed_t baud;
1238         unsigned long sl_flags;
1239         unsigned int flags;
1240         int retval = 0;
1241
1242         if (tty->index == MXSER_PORTS)
1243                 return -ENOTTY;
1244         if (tty_io_error(tty))
1245                 return -EIO;
1246
1247         mutex_lock(&port->mutex);
1248         if (!info->ioaddr) {
1249                 mutex_unlock(&port->mutex);
1250                 return -ENODEV;
1251         }
1252
1253         if (ss->irq != info->board->irq ||
1254                         ss->port != info->ioaddr) {
1255                 mutex_unlock(&port->mutex);
1256                 return -EINVAL;
1257         }
1258
1259         flags = port->flags & ASYNC_SPD_MASK;
1260
1261         if (!capable(CAP_SYS_ADMIN)) {
1262                 if ((ss->baud_base != info->baud_base) ||
1263                                 (ss->close_delay != info->port.close_delay) ||
1264                                 ((ss->flags & ~ASYNC_USR_MASK) != (info->port.flags & ~ASYNC_USR_MASK))) {
1265                         mutex_unlock(&port->mutex);
1266                         return -EPERM;
1267                 }
1268                 info->port.flags = ((info->port.flags & ~ASYNC_USR_MASK) |
1269                                 (ss->flags & ASYNC_USR_MASK));
1270         } else {
1271                 /*
1272                  * OK, past this point, all the error checking has been done.
1273                  * At this point, we start making changes.....
1274                  */
1275                 port->flags = ((port->flags & ~ASYNC_FLAGS) |
1276                                 (ss->flags & ASYNC_FLAGS));
1277                 port->close_delay = ss->close_delay * HZ / 100;
1278                 port->closing_wait = ss->closing_wait * HZ / 100;
1279                 port->low_latency = (port->flags & ASYNC_LOW_LATENCY) ? 1 : 0;
1280                 if ((port->flags & ASYNC_SPD_MASK) == ASYNC_SPD_CUST &&
1281                                 (ss->baud_base != info->baud_base ||
1282                                 ss->custom_divisor !=
1283                                 info->custom_divisor)) {
1284                         if (ss->custom_divisor == 0) {
1285                                 mutex_unlock(&port->mutex);
1286                                 return -EINVAL;
1287                         }
1288                         baud = ss->baud_base / ss->custom_divisor;
1289                         tty_encode_baud_rate(tty, baud, baud);
1290                 }
1291         }
1292
1293         info->type = ss->type;
1294
1295         process_txrx_fifo(info);
1296
1297         if (tty_port_initialized(port)) {
1298                 if (flags != (port->flags & ASYNC_SPD_MASK)) {
1299                         spin_lock_irqsave(&info->slock, sl_flags);
1300                         mxser_change_speed(tty);
1301                         spin_unlock_irqrestore(&info->slock, sl_flags);
1302                 }
1303         } else {
1304                 retval = mxser_activate(port, tty);
1305                 if (retval == 0)
1306                         tty_port_set_initialized(port, 1);
1307         }
1308         mutex_unlock(&port->mutex);
1309         return retval;
1310 }
1311
1312 /*
1313  * mxser_get_lsr_info - get line status register info
1314  *
1315  * Purpose: Let user call ioctl() to get info when the UART physically
1316  *          is emptied.  On bus types like RS485, the transmitter must
1317  *          release the bus after transmitting. This must be done when
1318  *          the transmit shift register is empty, not be done when the
1319  *          transmit holding register is empty.  This functionality
1320  *          allows an RS485 driver to be written in user space.
1321  */
1322 static int mxser_get_lsr_info(struct mxser_port *info,
1323                 unsigned int __user *value)
1324 {
1325         unsigned char status;
1326         unsigned int result;
1327         unsigned long flags;
1328
1329         spin_lock_irqsave(&info->slock, flags);
1330         status = inb(info->ioaddr + UART_LSR);
1331         spin_unlock_irqrestore(&info->slock, flags);
1332         result = ((status & UART_LSR_TEMT) ? TIOCSER_TEMT : 0);
1333         return put_user(result, value);
1334 }
1335
1336 static int mxser_tiocmget(struct tty_struct *tty)
1337 {
1338         struct mxser_port *info = tty->driver_data;
1339         unsigned char control, status;
1340         unsigned long flags;
1341
1342
1343         if (tty->index == MXSER_PORTS)
1344                 return -ENOIOCTLCMD;
1345         if (tty_io_error(tty))
1346                 return -EIO;
1347
1348         control = info->MCR;
1349
1350         spin_lock_irqsave(&info->slock, flags);
1351         status = inb(info->ioaddr + UART_MSR);
1352         if (status & UART_MSR_ANY_DELTA)
1353                 mxser_check_modem_status(tty, info, status);
1354         spin_unlock_irqrestore(&info->slock, flags);
1355         return ((control & UART_MCR_RTS) ? TIOCM_RTS : 0) |
1356                     ((control & UART_MCR_DTR) ? TIOCM_DTR : 0) |
1357                     ((status & UART_MSR_DCD) ? TIOCM_CAR : 0) |
1358                     ((status & UART_MSR_RI) ? TIOCM_RNG : 0) |
1359                     ((status & UART_MSR_DSR) ? TIOCM_DSR : 0) |
1360                     ((status & UART_MSR_CTS) ? TIOCM_CTS : 0);
1361 }
1362
1363 static int mxser_tiocmset(struct tty_struct *tty,
1364                 unsigned int set, unsigned int clear)
1365 {
1366         struct mxser_port *info = tty->driver_data;
1367         unsigned long flags;
1368
1369
1370         if (tty->index == MXSER_PORTS)
1371                 return -ENOIOCTLCMD;
1372         if (tty_io_error(tty))
1373                 return -EIO;
1374
1375         spin_lock_irqsave(&info->slock, flags);
1376
1377         if (set & TIOCM_RTS)
1378                 info->MCR |= UART_MCR_RTS;
1379         if (set & TIOCM_DTR)
1380                 info->MCR |= UART_MCR_DTR;
1381
1382         if (clear & TIOCM_RTS)
1383                 info->MCR &= ~UART_MCR_RTS;
1384         if (clear & TIOCM_DTR)
1385                 info->MCR &= ~UART_MCR_DTR;
1386
1387         outb(info->MCR, info->ioaddr + UART_MCR);
1388         spin_unlock_irqrestore(&info->slock, flags);
1389         return 0;
1390 }
1391
1392 static int __init mxser_program_mode(int port)
1393 {
1394         int id, i, j, n;
1395
1396         outb(0, port);
1397         outb(0, port);
1398         outb(0, port);
1399         (void)inb(port);
1400         (void)inb(port);
1401         outb(0, port);
1402         (void)inb(port);
1403
1404         id = inb(port + 1) & 0x1F;
1405         if ((id != C168_ASIC_ID) &&
1406                         (id != C104_ASIC_ID) &&
1407                         (id != C102_ASIC_ID) &&
1408                         (id != CI132_ASIC_ID) &&
1409                         (id != CI134_ASIC_ID) &&
1410                         (id != CI104J_ASIC_ID))
1411                 return -1;
1412         for (i = 0, j = 0; i < 4; i++) {
1413                 n = inb(port + 2);
1414                 if (n == 'M') {
1415                         j = 1;
1416                 } else if ((j == 1) && (n == 1)) {
1417                         j = 2;
1418                         break;
1419                 } else
1420                         j = 0;
1421         }
1422         if (j != 2)
1423                 id = -2;
1424         return id;
1425 }
1426
1427 static void __init mxser_normal_mode(int port)
1428 {
1429         int i, n;
1430
1431         outb(0xA5, port + 1);
1432         outb(0x80, port + 3);
1433         outb(12, port + 0);     /* 9600 bps */
1434         outb(0, port + 1);
1435         outb(0x03, port + 3);   /* 8 data bits */
1436         outb(0x13, port + 4);   /* loop back mode */
1437         for (i = 0; i < 16; i++) {
1438                 n = inb(port + 5);
1439                 if ((n & 0x61) == 0x60)
1440                         break;
1441                 if ((n & 1) == 1)
1442                         (void)inb(port);
1443         }
1444         outb(0x00, port + 4);
1445 }
1446
1447 #define CHIP_SK         0x01    /* Serial Data Clock  in Eprom */
1448 #define CHIP_DO         0x02    /* Serial Data Output in Eprom */
1449 #define CHIP_CS         0x04    /* Serial Chip Select in Eprom */
1450 #define CHIP_DI         0x08    /* Serial Data Input  in Eprom */
1451 #define EN_CCMD         0x000   /* Chip's command register     */
1452 #define EN0_RSARLO      0x008   /* Remote start address reg 0  */
1453 #define EN0_RSARHI      0x009   /* Remote start address reg 1  */
1454 #define EN0_RCNTLO      0x00A   /* Remote byte count reg WR    */
1455 #define EN0_RCNTHI      0x00B   /* Remote byte count reg WR    */
1456 #define EN0_DCFG        0x00E   /* Data configuration reg WR   */
1457 #define EN0_PORT        0x010   /* Rcv missed frame error counter RD */
1458 #define ENC_PAGE0       0x000   /* Select page 0 of chip registers   */
1459 #define ENC_PAGE3       0x0C0   /* Select page 3 of chip registers   */
1460 static int __init mxser_read_register(int port, unsigned short *regs)
1461 {
1462         int i, k, value, id;
1463         unsigned int j;
1464
1465         id = mxser_program_mode(port);
1466         if (id < 0)
1467                 return id;
1468         for (i = 0; i < 14; i++) {
1469                 k = (i & 0x3F) | 0x180;
1470                 for (j = 0x100; j > 0; j >>= 1) {
1471                         outb(CHIP_CS, port);
1472                         if (k & j) {
1473                                 outb(CHIP_CS | CHIP_DO, port);
1474                                 outb(CHIP_CS | CHIP_DO | CHIP_SK, port);        /* A? bit of read */
1475                         } else {
1476                                 outb(CHIP_CS, port);
1477                                 outb(CHIP_CS | CHIP_SK, port);  /* A? bit of read */
1478                         }
1479                 }
1480                 (void)inb(port);
1481                 value = 0;
1482                 for (k = 0, j = 0x8000; k < 16; k++, j >>= 1) {
1483                         outb(CHIP_CS, port);
1484                         outb(CHIP_CS | CHIP_SK, port);
1485                         if (inb(port) & CHIP_DI)
1486                                 value |= j;
1487                 }
1488                 regs[i] = value;
1489                 outb(0, port);
1490         }
1491         mxser_normal_mode(port);
1492         return id;
1493 }
1494
1495 static int mxser_ioctl_special(unsigned int cmd, void __user *argp)
1496 {
1497         struct mxser_port *ip;
1498         struct tty_port *port;
1499         struct tty_struct *tty;
1500         int result, status;
1501         unsigned int i, j;
1502         int ret = 0;
1503
1504         switch (cmd) {
1505         case MOXA_GET_MAJOR:
1506                 printk_ratelimited(KERN_WARNING "mxser: '%s' uses deprecated ioctl "
1507                                         "%x (GET_MAJOR), fix your userspace\n",
1508                                         current->comm, cmd);
1509                 return put_user(ttymajor, (int __user *)argp);
1510
1511         case MOXA_CHKPORTENABLE:
1512                 result = 0;
1513                 for (i = 0; i < MXSER_BOARDS; i++)
1514                         for (j = 0; j < MXSER_PORTS_PER_BOARD; j++)
1515                                 if (mxser_boards[i].ports[j].ioaddr)
1516                                         result |= (1 << i);
1517                 return put_user(result, (unsigned long __user *)argp);
1518         case MOXA_GETDATACOUNT:
1519                 /* The receive side is locked by port->slock but it isn't
1520                    clear that an exact snapshot is worth copying here */
1521                 if (copy_to_user(argp, &mxvar_log, sizeof(mxvar_log)))
1522                         ret = -EFAULT;
1523                 return ret;
1524         case MOXA_GETMSTATUS: {
1525                 struct mxser_mstatus ms, __user *msu = argp;
1526                 for (i = 0; i < MXSER_BOARDS; i++)
1527                         for (j = 0; j < MXSER_PORTS_PER_BOARD; j++) {
1528                                 ip = &mxser_boards[i].ports[j];
1529                                 port = &ip->port;
1530                                 memset(&ms, 0, sizeof(ms));
1531
1532                                 mutex_lock(&port->mutex);
1533                                 if (!ip->ioaddr)
1534                                         goto copy;
1535
1536                                 tty = tty_port_tty_get(port);
1537
1538                                 if (!tty)
1539                                         ms.cflag = ip->normal_termios.c_cflag;
1540                                 else
1541                                         ms.cflag = tty->termios.c_cflag;
1542                                 tty_kref_put(tty);
1543                                 spin_lock_irq(&ip->slock);
1544                                 status = inb(ip->ioaddr + UART_MSR);
1545                                 spin_unlock_irq(&ip->slock);
1546                                 if (status & UART_MSR_DCD)
1547                                         ms.dcd = 1;
1548                                 if (status & UART_MSR_DSR)
1549                                         ms.dsr = 1;
1550                                 if (status & UART_MSR_CTS)
1551                                         ms.cts = 1;
1552                         copy:
1553                                 mutex_unlock(&port->mutex);
1554                                 if (copy_to_user(msu, &ms, sizeof(ms)))
1555                                         return -EFAULT;
1556                                 msu++;
1557                         }
1558                 return 0;
1559         }
1560         case MOXA_ASPP_MON_EXT: {
1561                 struct mxser_mon_ext *me; /* it's 2k, stack unfriendly */
1562                 unsigned int cflag, iflag, p;
1563                 u8 opmode;
1564
1565                 me = kzalloc(sizeof(*me), GFP_KERNEL);
1566                 if (!me)
1567                         return -ENOMEM;
1568
1569                 for (i = 0, p = 0; i < MXSER_BOARDS; i++) {
1570                         for (j = 0; j < MXSER_PORTS_PER_BOARD; j++, p++) {
1571                                 if (p >= ARRAY_SIZE(me->rx_cnt)) {
1572                                         i = MXSER_BOARDS;
1573                                         break;
1574                                 }
1575                                 ip = &mxser_boards[i].ports[j];
1576                                 port = &ip->port;
1577
1578                                 mutex_lock(&port->mutex);
1579                                 if (!ip->ioaddr) {
1580                                         mutex_unlock(&port->mutex);
1581                                         continue;
1582                                 }
1583
1584                                 spin_lock_irq(&ip->slock);
1585                                 status = mxser_get_msr(ip->ioaddr, 0, p);
1586
1587                                 if (status & UART_MSR_TERI)
1588                                         ip->icount.rng++;
1589                                 if (status & UART_MSR_DDSR)
1590                                         ip->icount.dsr++;
1591                                 if (status & UART_MSR_DDCD)
1592                                         ip->icount.dcd++;
1593                                 if (status & UART_MSR_DCTS)
1594                                         ip->icount.cts++;
1595
1596                                 ip->mon_data.modem_status = status;
1597                                 me->rx_cnt[p] = ip->mon_data.rxcnt;
1598                                 me->tx_cnt[p] = ip->mon_data.txcnt;
1599                                 me->up_rxcnt[p] = ip->mon_data.up_rxcnt;
1600                                 me->up_txcnt[p] = ip->mon_data.up_txcnt;
1601                                 me->modem_status[p] =
1602                                         ip->mon_data.modem_status;
1603                                 spin_unlock_irq(&ip->slock);
1604
1605                                 tty = tty_port_tty_get(&ip->port);
1606
1607                                 if (!tty) {
1608                                         cflag = ip->normal_termios.c_cflag;
1609                                         iflag = ip->normal_termios.c_iflag;
1610                                         me->baudrate[p] = tty_termios_baud_rate(&ip->normal_termios);
1611                                 } else {
1612                                         cflag = tty->termios.c_cflag;
1613                                         iflag = tty->termios.c_iflag;
1614                                         me->baudrate[p] = tty_get_baud_rate(tty);
1615                                 }
1616                                 tty_kref_put(tty);
1617
1618                                 me->databits[p] = cflag & CSIZE;
1619                                 me->stopbits[p] = cflag & CSTOPB;
1620                                 me->parity[p] = cflag & (PARENB | PARODD |
1621                                                 CMSPAR);
1622
1623                                 if (cflag & CRTSCTS)
1624                                         me->flowctrl[p] |= 0x03;
1625
1626                                 if (iflag & (IXON | IXOFF))
1627                                         me->flowctrl[p] |= 0x0C;
1628
1629                                 if (ip->type == PORT_16550A)
1630                                         me->fifo[p] = 1;
1631
1632                                 if (ip->board->chip_flag == MOXA_MUST_MU860_HWID) {
1633                                         opmode = inb(ip->opmode_ioaddr)>>((p % 4) * 2);
1634                                         opmode &= OP_MODE_MASK;
1635                                 } else {
1636                                         opmode = RS232_MODE;
1637                                 }
1638                                 me->iftype[p] = opmode;
1639                                 mutex_unlock(&port->mutex);
1640                         }
1641                 }
1642                 if (copy_to_user(argp, me, sizeof(*me)))
1643                         ret = -EFAULT;
1644                 kfree(me);
1645                 return ret;
1646         }
1647         default:
1648                 return -ENOIOCTLCMD;
1649         }
1650         return 0;
1651 }
1652
1653 static int mxser_cflags_changed(struct mxser_port *info, unsigned long arg,
1654                 struct async_icount *cprev)
1655 {
1656         struct async_icount cnow;
1657         unsigned long flags;
1658         int ret;
1659
1660         spin_lock_irqsave(&info->slock, flags);
1661         cnow = info->icount;    /* atomic copy */
1662         spin_unlock_irqrestore(&info->slock, flags);
1663
1664         ret =   ((arg & TIOCM_RNG) && (cnow.rng != cprev->rng)) ||
1665                 ((arg & TIOCM_DSR) && (cnow.dsr != cprev->dsr)) ||
1666                 ((arg & TIOCM_CD)  && (cnow.dcd != cprev->dcd)) ||
1667                 ((arg & TIOCM_CTS) && (cnow.cts != cprev->cts));
1668
1669         *cprev = cnow;
1670
1671         return ret;
1672 }
1673
1674 static int mxser_ioctl(struct tty_struct *tty,
1675                 unsigned int cmd, unsigned long arg)
1676 {
1677         struct mxser_port *info = tty->driver_data;
1678         struct async_icount cnow;
1679         unsigned long flags;
1680         void __user *argp = (void __user *)arg;
1681
1682         if (tty->index == MXSER_PORTS)
1683                 return mxser_ioctl_special(cmd, argp);
1684
1685         if (cmd == MOXA_SET_OP_MODE || cmd == MOXA_GET_OP_MODE) {
1686                 int p;
1687                 unsigned long opmode;
1688                 static unsigned char ModeMask[] = { 0xfc, 0xf3, 0xcf, 0x3f };
1689                 int shiftbit;
1690                 unsigned char val, mask;
1691
1692                 if (info->board->chip_flag != MOXA_MUST_MU860_HWID)
1693                         return -EFAULT;
1694
1695                 p = tty->index % 4;
1696                 if (cmd == MOXA_SET_OP_MODE) {
1697                         if (get_user(opmode, (int __user *) argp))
1698                                 return -EFAULT;
1699                         if (opmode != RS232_MODE &&
1700                                         opmode != RS485_2WIRE_MODE &&
1701                                         opmode != RS422_MODE &&
1702                                         opmode != RS485_4WIRE_MODE)
1703                                 return -EFAULT;
1704                         mask = ModeMask[p];
1705                         shiftbit = p * 2;
1706                         spin_lock_irq(&info->slock);
1707                         val = inb(info->opmode_ioaddr);
1708                         val &= mask;
1709                         val |= (opmode << shiftbit);
1710                         outb(val, info->opmode_ioaddr);
1711                         spin_unlock_irq(&info->slock);
1712                 } else {
1713                         shiftbit = p * 2;
1714                         spin_lock_irq(&info->slock);
1715                         opmode = inb(info->opmode_ioaddr) >> shiftbit;
1716                         spin_unlock_irq(&info->slock);
1717                         opmode &= OP_MODE_MASK;
1718                         if (put_user(opmode, (int __user *)argp))
1719                                 return -EFAULT;
1720                 }
1721                 return 0;
1722         }
1723
1724         if (cmd != TIOCMIWAIT && tty_io_error(tty))
1725                 return -EIO;
1726
1727         switch (cmd) {
1728         case TIOCSERGETLSR:     /* Get line status register */
1729                 return  mxser_get_lsr_info(info, argp);
1730                 /*
1731                  * Wait for any of the 4 modem inputs (DCD,RI,DSR,CTS) to change
1732                  * - mask passed in arg for lines of interest
1733                  *   (use |'ed TIOCM_RNG/DSR/CD/CTS for masking)
1734                  * Caller should use TIOCGICOUNT to see which one it was
1735                  */
1736         case TIOCMIWAIT:
1737                 spin_lock_irqsave(&info->slock, flags);
1738                 cnow = info->icount;    /* note the counters on entry */
1739                 spin_unlock_irqrestore(&info->slock, flags);
1740
1741                 return wait_event_interruptible(info->port.delta_msr_wait,
1742                                 mxser_cflags_changed(info, arg, &cnow));
1743         case MOXA_HighSpeedOn:
1744                 return put_user(info->baud_base != 115200 ? 1 : 0, (int __user *)argp);
1745         case MOXA_SDS_RSTICOUNTER:
1746                 spin_lock_irq(&info->slock);
1747                 info->mon_data.rxcnt = 0;
1748                 info->mon_data.txcnt = 0;
1749                 spin_unlock_irq(&info->slock);
1750                 return 0;
1751
1752         case MOXA_ASPP_OQUEUE:{
1753                 int len, lsr;
1754
1755                 len = mxser_chars_in_buffer(tty);
1756                 spin_lock_irq(&info->slock);
1757                 lsr = inb(info->ioaddr + UART_LSR) & UART_LSR_THRE;
1758                 spin_unlock_irq(&info->slock);
1759                 len += (lsr ? 0 : 1);
1760
1761                 return put_user(len, (int __user *)argp);
1762         }
1763         case MOXA_ASPP_MON: {
1764                 int mcr, status;
1765
1766                 spin_lock_irq(&info->slock);
1767                 status = mxser_get_msr(info->ioaddr, 1, tty->index);
1768                 mxser_check_modem_status(tty, info, status);
1769
1770                 mcr = inb(info->ioaddr + UART_MCR);
1771                 spin_unlock_irq(&info->slock);
1772
1773                 if (mcr & MOXA_MUST_MCR_XON_FLAG)
1774                         info->mon_data.hold_reason &= ~NPPI_NOTIFY_XOFFHOLD;
1775                 else
1776                         info->mon_data.hold_reason |= NPPI_NOTIFY_XOFFHOLD;
1777
1778                 if (mcr & MOXA_MUST_MCR_TX_XON)
1779                         info->mon_data.hold_reason &= ~NPPI_NOTIFY_XOFFXENT;
1780                 else
1781                         info->mon_data.hold_reason |= NPPI_NOTIFY_XOFFXENT;
1782
1783                 if (tty->hw_stopped)
1784                         info->mon_data.hold_reason |= NPPI_NOTIFY_CTSHOLD;
1785                 else
1786                         info->mon_data.hold_reason &= ~NPPI_NOTIFY_CTSHOLD;
1787
1788                 if (copy_to_user(argp, &info->mon_data,
1789                                 sizeof(struct mxser_mon)))
1790                         return -EFAULT;
1791
1792                 return 0;
1793         }
1794         case MOXA_ASPP_LSTATUS: {
1795                 if (put_user(info->err_shadow, (unsigned char __user *)argp))
1796                         return -EFAULT;
1797
1798                 info->err_shadow = 0;
1799                 return 0;
1800         }
1801         case MOXA_SET_BAUD_METHOD: {
1802                 int method;
1803
1804                 if (get_user(method, (int __user *)argp))
1805                         return -EFAULT;
1806                 mxser_set_baud_method[tty->index] = method;
1807                 return put_user(method, (int __user *)argp);
1808         }
1809         default:
1810                 return -ENOIOCTLCMD;
1811         }
1812         return 0;
1813 }
1814
1815         /*
1816          * Get counter of input serial line interrupts (DCD,RI,DSR,CTS)
1817          * Return: write counters to the user passed counter struct
1818          * NB: both 1->0 and 0->1 transitions are counted except for
1819          *     RI where only 0->1 is counted.
1820          */
1821
1822 static int mxser_get_icount(struct tty_struct *tty,
1823                 struct serial_icounter_struct *icount)
1824
1825 {
1826         struct mxser_port *info = tty->driver_data;
1827         struct async_icount cnow;
1828         unsigned long flags;
1829
1830         spin_lock_irqsave(&info->slock, flags);
1831         cnow = info->icount;
1832         spin_unlock_irqrestore(&info->slock, flags);
1833
1834         icount->frame = cnow.frame;
1835         icount->brk = cnow.brk;
1836         icount->overrun = cnow.overrun;
1837         icount->buf_overrun = cnow.buf_overrun;
1838         icount->parity = cnow.parity;
1839         icount->rx = cnow.rx;
1840         icount->tx = cnow.tx;
1841         icount->cts = cnow.cts;
1842         icount->dsr = cnow.dsr;
1843         icount->rng = cnow.rng;
1844         icount->dcd = cnow.dcd;
1845         return 0;
1846 }
1847
1848 static void mxser_stoprx(struct tty_struct *tty)
1849 {
1850         struct mxser_port *info = tty->driver_data;
1851
1852         info->ldisc_stop_rx = 1;
1853         if (I_IXOFF(tty)) {
1854                 if (info->board->chip_flag) {
1855                         info->IER &= ~MOXA_MUST_RECV_ISR;
1856                         outb(info->IER, info->ioaddr + UART_IER);
1857                 } else {
1858                         info->x_char = STOP_CHAR(tty);
1859                         outb(0, info->ioaddr + UART_IER);
1860                         info->IER |= UART_IER_THRI;
1861                         outb(info->IER, info->ioaddr + UART_IER);
1862                 }
1863         }
1864
1865         if (C_CRTSCTS(tty)) {
1866                 info->MCR &= ~UART_MCR_RTS;
1867                 outb(info->MCR, info->ioaddr + UART_MCR);
1868         }
1869 }
1870
1871 /*
1872  * This routine is called by the upper-layer tty layer to signal that
1873  * incoming characters should be throttled.
1874  */
1875 static void mxser_throttle(struct tty_struct *tty)
1876 {
1877         mxser_stoprx(tty);
1878 }
1879
1880 static void mxser_unthrottle(struct tty_struct *tty)
1881 {
1882         struct mxser_port *info = tty->driver_data;
1883
1884         /* startrx */
1885         info->ldisc_stop_rx = 0;
1886         if (I_IXOFF(tty)) {
1887                 if (info->x_char)
1888                         info->x_char = 0;
1889                 else {
1890                         if (info->board->chip_flag) {
1891                                 info->IER |= MOXA_MUST_RECV_ISR;
1892                                 outb(info->IER, info->ioaddr + UART_IER);
1893                         } else {
1894                                 info->x_char = START_CHAR(tty);
1895                                 outb(0, info->ioaddr + UART_IER);
1896                                 info->IER |= UART_IER_THRI;
1897                                 outb(info->IER, info->ioaddr + UART_IER);
1898                         }
1899                 }
1900         }
1901
1902         if (C_CRTSCTS(tty)) {
1903                 info->MCR |= UART_MCR_RTS;
1904                 outb(info->MCR, info->ioaddr + UART_MCR);
1905         }
1906 }
1907
1908 /*
1909  * mxser_stop() and mxser_start()
1910  *
1911  * This routines are called before setting or resetting tty->stopped.
1912  * They enable or disable transmitter interrupts, as necessary.
1913  */
1914 static void mxser_stop(struct tty_struct *tty)
1915 {
1916         struct mxser_port *info = tty->driver_data;
1917         unsigned long flags;
1918
1919         spin_lock_irqsave(&info->slock, flags);
1920         if (info->IER & UART_IER_THRI) {
1921                 info->IER &= ~UART_IER_THRI;
1922                 outb(info->IER, info->ioaddr + UART_IER);
1923         }
1924         spin_unlock_irqrestore(&info->slock, flags);
1925 }
1926
1927 static void mxser_start(struct tty_struct *tty)
1928 {
1929         struct mxser_port *info = tty->driver_data;
1930         unsigned long flags;
1931
1932         spin_lock_irqsave(&info->slock, flags);
1933         if (info->xmit_cnt && info->port.xmit_buf) {
1934                 outb(info->IER & ~UART_IER_THRI, info->ioaddr + UART_IER);
1935                 info->IER |= UART_IER_THRI;
1936                 outb(info->IER, info->ioaddr + UART_IER);
1937         }
1938         spin_unlock_irqrestore(&info->slock, flags);
1939 }
1940
1941 static void mxser_set_termios(struct tty_struct *tty, struct ktermios *old_termios)
1942 {
1943         struct mxser_port *info = tty->driver_data;
1944         unsigned long flags;
1945
1946         spin_lock_irqsave(&info->slock, flags);
1947         mxser_change_speed(tty);
1948         spin_unlock_irqrestore(&info->slock, flags);
1949
1950         if ((old_termios->c_cflag & CRTSCTS) && !C_CRTSCTS(tty)) {
1951                 tty->hw_stopped = 0;
1952                 mxser_start(tty);
1953         }
1954
1955         /* Handle sw stopped */
1956         if ((old_termios->c_iflag & IXON) && !I_IXON(tty)) {
1957                 tty->stopped = 0;
1958
1959                 if (info->board->chip_flag) {
1960                         spin_lock_irqsave(&info->slock, flags);
1961                         mxser_disable_must_rx_software_flow_control(
1962                                         info->ioaddr);
1963                         spin_unlock_irqrestore(&info->slock, flags);
1964                 }
1965
1966                 mxser_start(tty);
1967         }
1968 }
1969
1970 /*
1971  * mxser_wait_until_sent() --- wait until the transmitter is empty
1972  */
1973 static void mxser_wait_until_sent(struct tty_struct *tty, int timeout)
1974 {
1975         struct mxser_port *info = tty->driver_data;
1976         unsigned long orig_jiffies, char_time;
1977         unsigned long flags;
1978         int lsr;
1979
1980         if (info->type == PORT_UNKNOWN)
1981                 return;
1982
1983         if (info->xmit_fifo_size == 0)
1984                 return;         /* Just in case.... */
1985
1986         orig_jiffies = jiffies;
1987         /*
1988          * Set the check interval to be 1/5 of the estimated time to
1989          * send a single character, and make it at least 1.  The check
1990          * interval should also be less than the timeout.
1991          *
1992          * Note: we have to use pretty tight timings here to satisfy
1993          * the NIST-PCTS.
1994          */
1995         char_time = (info->timeout - HZ / 50) / info->xmit_fifo_size;
1996         char_time = char_time / 5;
1997         if (char_time == 0)
1998                 char_time = 1;
1999         if (timeout && timeout < char_time)
2000                 char_time = timeout;
2001         /*
2002          * If the transmitter hasn't cleared in twice the approximate
2003          * amount of time to send the entire FIFO, it probably won't
2004          * ever clear.  This assumes the UART isn't doing flow
2005          * control, which is currently the case.  Hence, if it ever
2006          * takes longer than info->timeout, this is probably due to a
2007          * UART bug of some kind.  So, we clamp the timeout parameter at
2008          * 2*info->timeout.
2009          */
2010         if (!timeout || timeout > 2 * info->timeout)
2011                 timeout = 2 * info->timeout;
2012
2013         spin_lock_irqsave(&info->slock, flags);
2014         while (!((lsr = inb(info->ioaddr + UART_LSR)) & UART_LSR_TEMT)) {
2015                 spin_unlock_irqrestore(&info->slock, flags);
2016                 schedule_timeout_interruptible(char_time);
2017                 spin_lock_irqsave(&info->slock, flags);
2018                 if (signal_pending(current))
2019                         break;
2020                 if (timeout && time_after(jiffies, orig_jiffies + timeout))
2021                         break;
2022         }
2023         spin_unlock_irqrestore(&info->slock, flags);
2024         set_current_state(TASK_RUNNING);
2025 }
2026
2027 /*
2028  * This routine is called by tty_hangup() when a hangup is signaled.
2029  */
2030 static void mxser_hangup(struct tty_struct *tty)
2031 {
2032         struct mxser_port *info = tty->driver_data;
2033
2034         mxser_flush_buffer(tty);
2035         tty_port_hangup(&info->port);
2036 }
2037
2038 /*
2039  * mxser_rs_break() --- routine which turns the break handling on or off
2040  */
2041 static int mxser_rs_break(struct tty_struct *tty, int break_state)
2042 {
2043         struct mxser_port *info = tty->driver_data;
2044         unsigned long flags;
2045
2046         spin_lock_irqsave(&info->slock, flags);
2047         if (break_state == -1)
2048                 outb(inb(info->ioaddr + UART_LCR) | UART_LCR_SBC,
2049                         info->ioaddr + UART_LCR);
2050         else
2051                 outb(inb(info->ioaddr + UART_LCR) & ~UART_LCR_SBC,
2052                         info->ioaddr + UART_LCR);
2053         spin_unlock_irqrestore(&info->slock, flags);
2054         return 0;
2055 }
2056
2057 static void mxser_receive_chars(struct tty_struct *tty,
2058                                 struct mxser_port *port, int *status)
2059 {
2060         unsigned char ch, gdl;
2061         int ignored = 0;
2062         int cnt = 0;
2063         int recv_room;
2064         int max = 256;
2065
2066         recv_room = tty->receive_room;
2067         if (recv_room == 0 && !port->ldisc_stop_rx)
2068                 mxser_stoprx(tty);
2069         if (port->board->chip_flag != MOXA_OTHER_UART) {
2070
2071                 if (*status & UART_LSR_SPECIAL)
2072                         goto intr_old;
2073                 if (port->board->chip_flag == MOXA_MUST_MU860_HWID &&
2074                                 (*status & MOXA_MUST_LSR_RERR))
2075                         goto intr_old;
2076                 if (*status & MOXA_MUST_LSR_RERR)
2077                         goto intr_old;
2078
2079                 gdl = inb(port->ioaddr + MOXA_MUST_GDL_REGISTER);
2080
2081                 if (port->board->chip_flag == MOXA_MUST_MU150_HWID)
2082                         gdl &= MOXA_MUST_GDL_MASK;
2083                 if (gdl >= recv_room) {
2084                         if (!port->ldisc_stop_rx)
2085                                 mxser_stoprx(tty);
2086                 }
2087                 while (gdl--) {
2088                         ch = inb(port->ioaddr + UART_RX);
2089                         tty_insert_flip_char(&port->port, ch, 0);
2090                         cnt++;
2091                 }
2092                 goto end_intr;
2093         }
2094 intr_old:
2095
2096         do {
2097                 if (max-- < 0)
2098                         break;
2099
2100                 ch = inb(port->ioaddr + UART_RX);
2101                 if (port->board->chip_flag && (*status & UART_LSR_OE))
2102                         outb(0x23, port->ioaddr + UART_FCR);
2103                 *status &= port->read_status_mask;
2104                 if (*status & port->ignore_status_mask) {
2105                         if (++ignored > 100)
2106                                 break;
2107                 } else {
2108                         char flag = 0;
2109                         if (*status & UART_LSR_SPECIAL) {
2110                                 if (*status & UART_LSR_BI) {
2111                                         flag = TTY_BREAK;
2112                                         port->icount.brk++;
2113
2114                                         if (port->port.flags & ASYNC_SAK)
2115                                                 do_SAK(tty);
2116                                 } else if (*status & UART_LSR_PE) {
2117                                         flag = TTY_PARITY;
2118                                         port->icount.parity++;
2119                                 } else if (*status & UART_LSR_FE) {
2120                                         flag = TTY_FRAME;
2121                                         port->icount.frame++;
2122                                 } else if (*status & UART_LSR_OE) {
2123                                         flag = TTY_OVERRUN;
2124                                         port->icount.overrun++;
2125                                 } else
2126                                         flag = TTY_BREAK;
2127                         }
2128                         tty_insert_flip_char(&port->port, ch, flag);
2129                         cnt++;
2130                         if (cnt >= recv_room) {
2131                                 if (!port->ldisc_stop_rx)
2132                                         mxser_stoprx(tty);
2133                                 break;
2134                         }
2135
2136                 }
2137
2138                 if (port->board->chip_flag)
2139                         break;
2140
2141                 *status = inb(port->ioaddr + UART_LSR);
2142         } while (*status & UART_LSR_DR);
2143
2144 end_intr:
2145         mxvar_log.rxcnt[tty->index] += cnt;
2146         port->mon_data.rxcnt += cnt;
2147         port->mon_data.up_rxcnt += cnt;
2148
2149         /*
2150          * We are called from an interrupt context with &port->slock
2151          * being held. Drop it temporarily in order to prevent
2152          * recursive locking.
2153          */
2154         spin_unlock(&port->slock);
2155         tty_flip_buffer_push(&port->port);
2156         spin_lock(&port->slock);
2157 }
2158
2159 static void mxser_transmit_chars(struct tty_struct *tty, struct mxser_port *port)
2160 {
2161         int count, cnt;
2162
2163         if (port->x_char) {
2164                 outb(port->x_char, port->ioaddr + UART_TX);
2165                 port->x_char = 0;
2166                 mxvar_log.txcnt[tty->index]++;
2167                 port->mon_data.txcnt++;
2168                 port->mon_data.up_txcnt++;
2169                 port->icount.tx++;
2170                 return;
2171         }
2172
2173         if (port->port.xmit_buf == NULL)
2174                 return;
2175
2176         if (port->xmit_cnt <= 0 || tty->stopped ||
2177                         (tty->hw_stopped &&
2178                         (port->type != PORT_16550A) &&
2179                         (!port->board->chip_flag))) {
2180                 port->IER &= ~UART_IER_THRI;
2181                 outb(port->IER, port->ioaddr + UART_IER);
2182                 return;
2183         }
2184
2185         cnt = port->xmit_cnt;
2186         count = port->xmit_fifo_size;
2187         do {
2188                 outb(port->port.xmit_buf[port->xmit_tail++],
2189                         port->ioaddr + UART_TX);
2190                 port->xmit_tail = port->xmit_tail & (SERIAL_XMIT_SIZE - 1);
2191                 if (--port->xmit_cnt <= 0)
2192                         break;
2193         } while (--count > 0);
2194         mxvar_log.txcnt[tty->index] += (cnt - port->xmit_cnt);
2195
2196         port->mon_data.txcnt += (cnt - port->xmit_cnt);
2197         port->mon_data.up_txcnt += (cnt - port->xmit_cnt);
2198         port->icount.tx += (cnt - port->xmit_cnt);
2199
2200         if (port->xmit_cnt < WAKEUP_CHARS)
2201                 tty_wakeup(tty);
2202
2203         if (port->xmit_cnt <= 0) {
2204                 port->IER &= ~UART_IER_THRI;
2205                 outb(port->IER, port->ioaddr + UART_IER);
2206         }
2207 }
2208
2209 /*
2210  * This is the serial driver's generic interrupt routine
2211  */
2212 static irqreturn_t mxser_interrupt(int irq, void *dev_id)
2213 {
2214         int status, iir, i;
2215         struct mxser_board *brd = NULL;
2216         struct mxser_port *port;
2217         int max, irqbits, bits, msr;
2218         unsigned int int_cnt, pass_counter = 0;
2219         int handled = IRQ_NONE;
2220         struct tty_struct *tty;
2221
2222         for (i = 0; i < MXSER_BOARDS; i++)
2223                 if (dev_id == &mxser_boards[i]) {
2224                         brd = dev_id;
2225                         break;
2226                 }
2227
2228         if (i == MXSER_BOARDS)
2229                 goto irq_stop;
2230         if (brd == NULL)
2231                 goto irq_stop;
2232         max = brd->info->nports;
2233         while (pass_counter++ < MXSER_ISR_PASS_LIMIT) {
2234                 irqbits = inb(brd->vector) & brd->vector_mask;
2235                 if (irqbits == brd->vector_mask)
2236                         break;
2237
2238                 handled = IRQ_HANDLED;
2239                 for (i = 0, bits = 1; i < max; i++, irqbits |= bits, bits <<= 1) {
2240                         if (irqbits == brd->vector_mask)
2241                                 break;
2242                         if (bits & irqbits)
2243                                 continue;
2244                         port = &brd->ports[i];
2245
2246                         int_cnt = 0;
2247                         spin_lock(&port->slock);
2248                         do {
2249                                 iir = inb(port->ioaddr + UART_IIR);
2250                                 if (iir & UART_IIR_NO_INT)
2251                                         break;
2252                                 iir &= MOXA_MUST_IIR_MASK;
2253                                 tty = tty_port_tty_get(&port->port);
2254                                 if (!tty || port->closing ||
2255                                     !tty_port_initialized(&port->port)) {
2256                                         status = inb(port->ioaddr + UART_LSR);
2257                                         outb(0x27, port->ioaddr + UART_FCR);
2258                                         inb(port->ioaddr + UART_MSR);
2259                                         tty_kref_put(tty);
2260                                         break;
2261                                 }
2262
2263                                 status = inb(port->ioaddr + UART_LSR);
2264
2265                                 if (status & UART_LSR_PE)
2266                                         port->err_shadow |= NPPI_NOTIFY_PARITY;
2267                                 if (status & UART_LSR_FE)
2268                                         port->err_shadow |= NPPI_NOTIFY_FRAMING;
2269                                 if (status & UART_LSR_OE)
2270                                         port->err_shadow |=
2271                                                 NPPI_NOTIFY_HW_OVERRUN;
2272                                 if (status & UART_LSR_BI)
2273                                         port->err_shadow |= NPPI_NOTIFY_BREAK;
2274
2275                                 if (port->board->chip_flag) {
2276                                         if (iir == MOXA_MUST_IIR_GDA ||
2277                                             iir == MOXA_MUST_IIR_RDA ||
2278                                             iir == MOXA_MUST_IIR_RTO ||
2279                                             iir == MOXA_MUST_IIR_LSR)
2280                                                 mxser_receive_chars(tty, port,
2281                                                                 &status);
2282
2283                                 } else {
2284                                         status &= port->read_status_mask;
2285                                         if (status & UART_LSR_DR)
2286                                                 mxser_receive_chars(tty, port,
2287                                                                 &status);
2288                                 }
2289                                 msr = inb(port->ioaddr + UART_MSR);
2290                                 if (msr & UART_MSR_ANY_DELTA)
2291                                         mxser_check_modem_status(tty, port, msr);
2292
2293                                 if (port->board->chip_flag) {
2294                                         if (iir == 0x02 && (status &
2295                                                                 UART_LSR_THRE))
2296                                                 mxser_transmit_chars(tty, port);
2297                                 } else {
2298                                         if (status & UART_LSR_THRE)
2299                                                 mxser_transmit_chars(tty, port);
2300                                 }
2301                                 tty_kref_put(tty);
2302                         } while (int_cnt++ < MXSER_ISR_PASS_LIMIT);
2303                         spin_unlock(&port->slock);
2304                 }
2305         }
2306
2307 irq_stop:
2308         return handled;
2309 }
2310
2311 static const struct tty_operations mxser_ops = {
2312         .open = mxser_open,
2313         .close = mxser_close,
2314         .write = mxser_write,
2315         .put_char = mxser_put_char,
2316         .flush_chars = mxser_flush_chars,
2317         .write_room = mxser_write_room,
2318         .chars_in_buffer = mxser_chars_in_buffer,
2319         .flush_buffer = mxser_flush_buffer,
2320         .ioctl = mxser_ioctl,
2321         .throttle = mxser_throttle,
2322         .unthrottle = mxser_unthrottle,
2323         .set_termios = mxser_set_termios,
2324         .stop = mxser_stop,
2325         .start = mxser_start,
2326         .hangup = mxser_hangup,
2327         .break_ctl = mxser_rs_break,
2328         .wait_until_sent = mxser_wait_until_sent,
2329         .tiocmget = mxser_tiocmget,
2330         .tiocmset = mxser_tiocmset,
2331         .set_serial = mxser_set_serial_info,
2332         .get_serial = mxser_get_serial_info,
2333         .get_icount = mxser_get_icount,
2334 };
2335
2336 static const struct tty_port_operations mxser_port_ops = {
2337         .carrier_raised = mxser_carrier_raised,
2338         .dtr_rts = mxser_dtr_rts,
2339         .activate = mxser_activate,
2340         .shutdown = mxser_shutdown_port,
2341 };
2342
2343 /*
2344  * The MOXA Smartio/Industio serial driver boot-time initialization code!
2345  */
2346
2347 static bool allow_overlapping_vector;
2348 module_param(allow_overlapping_vector, bool, S_IRUGO);
2349 MODULE_PARM_DESC(allow_overlapping_vector, "whether we allow ISA cards to be configured such that vector overlabs IO ports (default=no)");
2350
2351 static bool mxser_overlapping_vector(struct mxser_board *brd)
2352 {
2353         return allow_overlapping_vector &&
2354                 brd->vector >= brd->ports[0].ioaddr &&
2355                 brd->vector < brd->ports[0].ioaddr + 8 * brd->info->nports;
2356 }
2357
2358 static int mxser_request_vector(struct mxser_board *brd)
2359 {
2360         if (mxser_overlapping_vector(brd))
2361                 return 0;
2362         return request_region(brd->vector, 1, "mxser(vector)") ? 0 : -EIO;
2363 }
2364
2365 static void mxser_release_vector(struct mxser_board *brd)
2366 {
2367         if (mxser_overlapping_vector(brd))
2368                 return;
2369         release_region(brd->vector, 1);
2370 }
2371
2372 static void mxser_release_ISA_res(struct mxser_board *brd)
2373 {
2374         release_region(brd->ports[0].ioaddr, 8 * brd->info->nports);
2375         mxser_release_vector(brd);
2376 }
2377
2378 static int mxser_initbrd(struct mxser_board *brd)
2379 {
2380         struct mxser_port *info;
2381         unsigned int i;
2382         int retval;
2383
2384         printk(KERN_INFO "mxser: max. baud rate = %d bps\n",
2385                         brd->ports[0].max_baud);
2386
2387         for (i = 0; i < brd->info->nports; i++) {
2388                 info = &brd->ports[i];
2389                 tty_port_init(&info->port);
2390                 info->port.ops = &mxser_port_ops;
2391                 info->board = brd;
2392                 info->stop_rx = 0;
2393                 info->ldisc_stop_rx = 0;
2394
2395                 /* Enhance mode enabled here */
2396                 if (brd->chip_flag != MOXA_OTHER_UART)
2397                         mxser_enable_must_enchance_mode(info->ioaddr);
2398
2399                 info->type = brd->uart_type;
2400
2401                 process_txrx_fifo(info);
2402
2403                 info->custom_divisor = info->baud_base * 16;
2404                 info->port.close_delay = 5 * HZ / 10;
2405                 info->port.closing_wait = 30 * HZ;
2406                 info->normal_termios = mxvar_sdriver->init_termios;
2407                 memset(&info->mon_data, 0, sizeof(struct mxser_mon));
2408                 info->err_shadow = 0;
2409                 spin_lock_init(&info->slock);
2410
2411                 /* before set INT ISR, disable all int */
2412                 outb(inb(info->ioaddr + UART_IER) & 0xf0,
2413                         info->ioaddr + UART_IER);
2414         }
2415
2416         retval = request_irq(brd->irq, mxser_interrupt, IRQF_SHARED, "mxser",
2417                         brd);
2418         if (retval) {
2419                 for (i = 0; i < brd->info->nports; i++)
2420                         tty_port_destroy(&brd->ports[i].port);
2421                 printk(KERN_ERR "Board %s: Request irq failed, IRQ (%d) may "
2422                         "conflict with another device.\n",
2423                         brd->info->name, brd->irq);
2424         }
2425
2426         return retval;
2427 }
2428
2429 static void mxser_board_remove(struct mxser_board *brd)
2430 {
2431         unsigned int i;
2432
2433         for (i = 0; i < brd->info->nports; i++) {
2434                 tty_unregister_device(mxvar_sdriver, brd->idx + i);
2435                 tty_port_destroy(&brd->ports[i].port);
2436         }
2437         free_irq(brd->irq, brd);
2438 }
2439
2440 static int __init mxser_get_ISA_conf(int cap, struct mxser_board *brd)
2441 {
2442         int id, i, bits, ret;
2443         unsigned short regs[16], irq;
2444         unsigned char scratch, scratch2;
2445
2446         brd->chip_flag = MOXA_OTHER_UART;
2447
2448         id = mxser_read_register(cap, regs);
2449         switch (id) {
2450         case C168_ASIC_ID:
2451                 brd->info = &mxser_cards[0];
2452                 break;
2453         case C104_ASIC_ID:
2454                 brd->info = &mxser_cards[1];
2455                 break;
2456         case CI104J_ASIC_ID:
2457                 brd->info = &mxser_cards[2];
2458                 break;
2459         case C102_ASIC_ID:
2460                 brd->info = &mxser_cards[5];
2461                 break;
2462         case CI132_ASIC_ID:
2463                 brd->info = &mxser_cards[6];
2464                 break;
2465         case CI134_ASIC_ID:
2466                 brd->info = &mxser_cards[7];
2467                 break;
2468         default:
2469                 return 0;
2470         }
2471
2472         irq = 0;
2473         /* some ISA cards have 2 ports, but we want to see them as 4-port (why?)
2474            Flag-hack checks if configuration should be read as 2-port here. */
2475         if (brd->info->nports == 2 || (brd->info->flags & MXSER_HAS2)) {
2476                 irq = regs[9] & 0xF000;
2477                 irq = irq | (irq >> 4);
2478                 if (irq != (regs[9] & 0xFF00))
2479                         goto err_irqconflict;
2480         } else if (brd->info->nports == 4) {
2481                 irq = regs[9] & 0xF000;
2482                 irq = irq | (irq >> 4);
2483                 irq = irq | (irq >> 8);
2484                 if (irq != regs[9])
2485                         goto err_irqconflict;
2486         } else if (brd->info->nports == 8) {
2487                 irq = regs[9] & 0xF000;
2488                 irq = irq | (irq >> 4);
2489                 irq = irq | (irq >> 8);
2490                 if ((irq != regs[9]) || (irq != regs[10]))
2491                         goto err_irqconflict;
2492         }
2493
2494         if (!irq) {
2495                 printk(KERN_ERR "mxser: interrupt number unset\n");
2496                 return -EIO;
2497         }
2498         brd->irq = ((int)(irq & 0xF000) >> 12);
2499         for (i = 0; i < 8; i++)
2500                 brd->ports[i].ioaddr = (int) regs[i + 1] & 0xFFF8;
2501         if ((regs[12] & 0x80) == 0) {
2502                 printk(KERN_ERR "mxser: invalid interrupt vector\n");
2503                 return -EIO;
2504         }
2505         brd->vector = (int)regs[11];    /* interrupt vector */
2506         if (id == 1)
2507                 brd->vector_mask = 0x00FF;
2508         else
2509                 brd->vector_mask = 0x000F;
2510         for (i = 7, bits = 0x0100; i >= 0; i--, bits <<= 1) {
2511                 if (regs[12] & bits) {
2512                         brd->ports[i].baud_base = 921600;
2513                         brd->ports[i].max_baud = 921600;
2514                 } else {
2515                         brd->ports[i].baud_base = 115200;
2516                         brd->ports[i].max_baud = 115200;
2517                 }
2518         }
2519         scratch2 = inb(cap + UART_LCR) & (~UART_LCR_DLAB);
2520         outb(scratch2 | UART_LCR_DLAB, cap + UART_LCR);
2521         outb(0, cap + UART_EFR);        /* EFR is the same as FCR */
2522         outb(scratch2, cap + UART_LCR);
2523         outb(UART_FCR_ENABLE_FIFO, cap + UART_FCR);
2524         scratch = inb(cap + UART_IIR);
2525
2526         if (scratch & 0xC0)
2527                 brd->uart_type = PORT_16550A;
2528         else
2529                 brd->uart_type = PORT_16450;
2530         if (!request_region(brd->ports[0].ioaddr, 8 * brd->info->nports,
2531                         "mxser(IO)")) {
2532                 printk(KERN_ERR "mxser: can't request ports I/O region: "
2533                                 "0x%.8lx-0x%.8lx\n",
2534                                 brd->ports[0].ioaddr, brd->ports[0].ioaddr +
2535                                 8 * brd->info->nports - 1);
2536                 return -EIO;
2537         }
2538
2539         ret = mxser_request_vector(brd);
2540         if (ret) {
2541                 release_region(brd->ports[0].ioaddr, 8 * brd->info->nports);
2542                 printk(KERN_ERR "mxser: can't request interrupt vector region: "
2543                                 "0x%.8lx-0x%.8lx\n",
2544                                 brd->ports[0].ioaddr, brd->ports[0].ioaddr +
2545                                 8 * brd->info->nports - 1);
2546                 return ret;
2547         }
2548         return brd->info->nports;
2549
2550 err_irqconflict:
2551         printk(KERN_ERR "mxser: invalid interrupt number\n");
2552         return -EIO;
2553 }
2554
2555 static int mxser_probe(struct pci_dev *pdev,
2556                 const struct pci_device_id *ent)
2557 {
2558 #ifdef CONFIG_PCI
2559         struct mxser_board *brd;
2560         unsigned int i, j;
2561         unsigned long ioaddress;
2562         struct device *tty_dev;
2563         int retval = -EINVAL;
2564
2565         for (i = 0; i < MXSER_BOARDS; i++)
2566                 if (mxser_boards[i].info == NULL)
2567                         break;
2568
2569         if (i >= MXSER_BOARDS) {
2570                 dev_err(&pdev->dev, "too many boards found (maximum %d), board "
2571                                 "not configured\n", MXSER_BOARDS);
2572                 goto err;
2573         }
2574
2575         brd = &mxser_boards[i];
2576         brd->idx = i * MXSER_PORTS_PER_BOARD;
2577         dev_info(&pdev->dev, "found MOXA %s board (BusNo=%d, DevNo=%d)\n",
2578                 mxser_cards[ent->driver_data].name,
2579                 pdev->bus->number, PCI_SLOT(pdev->devfn));
2580
2581         retval = pci_enable_device(pdev);
2582         if (retval) {
2583                 dev_err(&pdev->dev, "PCI enable failed\n");
2584                 goto err;
2585         }
2586
2587         /* io address */
2588         ioaddress = pci_resource_start(pdev, 2);
2589         retval = pci_request_region(pdev, 2, "mxser(IO)");
2590         if (retval)
2591                 goto err_dis;
2592
2593         brd->info = &mxser_cards[ent->driver_data];
2594         for (i = 0; i < brd->info->nports; i++)
2595                 brd->ports[i].ioaddr = ioaddress + 8 * i;
2596
2597         /* vector */
2598         ioaddress = pci_resource_start(pdev, 3);
2599         retval = pci_request_region(pdev, 3, "mxser(vector)");
2600         if (retval)
2601                 goto err_zero;
2602         brd->vector = ioaddress;
2603
2604         /* irq */
2605         brd->irq = pdev->irq;
2606
2607         brd->chip_flag = CheckIsMoxaMust(brd->ports[0].ioaddr);
2608         brd->uart_type = PORT_16550A;
2609         brd->vector_mask = 0;
2610
2611         for (i = 0; i < brd->info->nports; i++) {
2612                 for (j = 0; j < UART_INFO_NUM; j++) {
2613                         if (Gpci_uart_info[j].type == brd->chip_flag) {
2614                                 brd->ports[i].max_baud =
2615                                         Gpci_uart_info[j].max_baud;
2616
2617                                 /* exception....CP-102 */
2618                                 if (brd->info->flags & MXSER_HIGHBAUD)
2619                                         brd->ports[i].max_baud = 921600;
2620                                 break;
2621                         }
2622                 }
2623         }
2624
2625         if (brd->chip_flag == MOXA_MUST_MU860_HWID) {
2626                 for (i = 0; i < brd->info->nports; i++) {
2627                         if (i < 4)
2628                                 brd->ports[i].opmode_ioaddr = ioaddress + 4;
2629                         else
2630                                 brd->ports[i].opmode_ioaddr = ioaddress + 0x0c;
2631                 }
2632                 outb(0, ioaddress + 4); /* default set to RS232 mode */
2633                 outb(0, ioaddress + 0x0c);      /* default set to RS232 mode */
2634         }
2635
2636         for (i = 0; i < brd->info->nports; i++) {
2637                 brd->vector_mask |= (1 << i);
2638                 brd->ports[i].baud_base = 921600;
2639         }
2640
2641         /* mxser_initbrd will hook ISR. */
2642         retval = mxser_initbrd(brd);
2643         if (retval)
2644                 goto err_rel3;
2645
2646         for (i = 0; i < brd->info->nports; i++) {
2647                 tty_dev = tty_port_register_device(&brd->ports[i].port,
2648                                 mxvar_sdriver, brd->idx + i, &pdev->dev);
2649                 if (IS_ERR(tty_dev)) {
2650                         retval = PTR_ERR(tty_dev);
2651                         for (; i > 0; i--)
2652                                 tty_unregister_device(mxvar_sdriver,
2653                                         brd->idx + i - 1);
2654                         goto err_relbrd;
2655                 }
2656         }
2657
2658         pci_set_drvdata(pdev, brd);
2659
2660         return 0;
2661 err_relbrd:
2662         for (i = 0; i < brd->info->nports; i++)
2663                 tty_port_destroy(&brd->ports[i].port);
2664         free_irq(brd->irq, brd);
2665 err_rel3:
2666         pci_release_region(pdev, 3);
2667 err_zero:
2668         brd->info = NULL;
2669         pci_release_region(pdev, 2);
2670 err_dis:
2671         pci_disable_device(pdev);
2672 err:
2673         return retval;
2674 #else
2675         return -ENODEV;
2676 #endif
2677 }
2678
2679 static void mxser_remove(struct pci_dev *pdev)
2680 {
2681 #ifdef CONFIG_PCI
2682         struct mxser_board *brd = pci_get_drvdata(pdev);
2683
2684         mxser_board_remove(brd);
2685
2686         pci_release_region(pdev, 2);
2687         pci_release_region(pdev, 3);
2688         pci_disable_device(pdev);
2689         brd->info = NULL;
2690 #endif
2691 }
2692
2693 static struct pci_driver mxser_driver = {
2694         .name = "mxser",
2695         .id_table = mxser_pcibrds,
2696         .probe = mxser_probe,
2697         .remove = mxser_remove
2698 };
2699
2700 static int __init mxser_module_init(void)
2701 {
2702         struct mxser_board *brd;
2703         struct device *tty_dev;
2704         unsigned int b, i, m;
2705         int retval;
2706
2707         mxvar_sdriver = alloc_tty_driver(MXSER_PORTS + 1);
2708         if (!mxvar_sdriver)
2709                 return -ENOMEM;
2710
2711         printk(KERN_INFO "MOXA Smartio/Industio family driver version %s\n",
2712                 MXSER_VERSION);
2713
2714         /* Initialize the tty_driver structure */
2715         mxvar_sdriver->name = "ttyMI";
2716         mxvar_sdriver->major = ttymajor;
2717         mxvar_sdriver->minor_start = 0;
2718         mxvar_sdriver->type = TTY_DRIVER_TYPE_SERIAL;
2719         mxvar_sdriver->subtype = SERIAL_TYPE_NORMAL;
2720         mxvar_sdriver->init_termios = tty_std_termios;
2721         mxvar_sdriver->init_termios.c_cflag = B9600|CS8|CREAD|HUPCL|CLOCAL;
2722         mxvar_sdriver->flags = TTY_DRIVER_REAL_RAW|TTY_DRIVER_DYNAMIC_DEV;
2723         tty_set_operations(mxvar_sdriver, &mxser_ops);
2724
2725         retval = tty_register_driver(mxvar_sdriver);
2726         if (retval) {
2727                 printk(KERN_ERR "Couldn't install MOXA Smartio/Industio family "
2728                                 "tty driver !\n");
2729                 goto err_put;
2730         }
2731
2732         /* Start finding ISA boards here */
2733         for (m = 0, b = 0; b < MXSER_BOARDS; b++) {
2734                 if (!ioaddr[b])
2735                         continue;
2736
2737                 brd = &mxser_boards[m];
2738                 retval = mxser_get_ISA_conf(ioaddr[b], brd);
2739                 if (retval <= 0) {
2740                         brd->info = NULL;
2741                         continue;
2742                 }
2743
2744                 printk(KERN_INFO "mxser: found MOXA %s board (CAP=0x%lx)\n",
2745                                 brd->info->name, ioaddr[b]);
2746
2747                 /* mxser_initbrd will hook ISR. */
2748                 if (mxser_initbrd(brd) < 0) {
2749                         mxser_release_ISA_res(brd);
2750                         brd->info = NULL;
2751                         continue;
2752                 }
2753
2754                 brd->idx = m * MXSER_PORTS_PER_BOARD;
2755                 for (i = 0; i < brd->info->nports; i++) {
2756                         tty_dev = tty_port_register_device(&brd->ports[i].port,
2757                                         mxvar_sdriver, brd->idx + i, NULL);
2758                         if (IS_ERR(tty_dev)) {
2759                                 for (; i > 0; i--)
2760                                         tty_unregister_device(mxvar_sdriver,
2761                                                 brd->idx + i - 1);
2762                                 for (i = 0; i < brd->info->nports; i++)
2763                                         tty_port_destroy(&brd->ports[i].port);
2764                                 free_irq(brd->irq, brd);
2765                                 mxser_release_ISA_res(brd);
2766                                 brd->info = NULL;
2767                                 break;
2768                         }
2769                 }
2770                 if (brd->info == NULL)
2771                         continue;
2772
2773                 m++;
2774         }
2775
2776         retval = pci_register_driver(&mxser_driver);
2777         if (retval) {
2778                 printk(KERN_ERR "mxser: can't register pci driver\n");
2779                 if (!m) {
2780                         retval = -ENODEV;
2781                         goto err_unr;
2782                 } /* else: we have some ISA cards under control */
2783         }
2784
2785         return 0;
2786 err_unr:
2787         tty_unregister_driver(mxvar_sdriver);
2788 err_put:
2789         put_tty_driver(mxvar_sdriver);
2790         return retval;
2791 }
2792
2793 static void __exit mxser_module_exit(void)
2794 {
2795         unsigned int i;
2796
2797         pci_unregister_driver(&mxser_driver);
2798
2799         for (i = 0; i < MXSER_BOARDS; i++) /* ISA remains */
2800                 if (mxser_boards[i].info != NULL)
2801                         mxser_board_remove(&mxser_boards[i]);
2802         tty_unregister_driver(mxvar_sdriver);
2803         put_tty_driver(mxvar_sdriver);
2804
2805         for (i = 0; i < MXSER_BOARDS; i++)
2806                 if (mxser_boards[i].info != NULL)
2807                         mxser_release_ISA_res(&mxser_boards[i]);
2808 }
2809
2810 module_init(mxser_module_init);
2811 module_exit(mxser_module_exit);