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 void mxser_change_speed(struct tty_struct *tty)
 642 {
 643         struct mxser_port *info = tty->driver_data;
 644         unsigned cflag, cval, fcr;
 645         unsigned char status;
 646
 647         cflag = tty->termios.c_cflag;
 648         if (!info->ioaddr)
 649                 return;
 650
 651         if (mxser_set_baud_method[tty->index] == 0)
 652                 mxser_set_baud(tty, tty_get_baud_rate(tty));
 653
 654         /* byte size and parity */
 655         switch (cflag & CSIZE) {
 656         case CS5:
 657                 cval = 0x00;
 658                 break;
 659         case CS6:
 660                 cval = 0x01;
 661                 break;
 662         case CS7:
 663                 cval = 0x02;
 664                 break;
 665         case CS8:
 666                 cval = 0x03;
 667                 break;
 668         default:
 669                 cval = 0x00;
 670                 break;          /* too keep GCC shut... */
 671         }
 672         if (cflag & CSTOPB)
 673                 cval |= 0x04;
 674         if (cflag & PARENB)
 675                 cval |= UART_LCR_PARITY;
 676         if (!(cflag & PARODD))
 677                 cval |= UART_LCR_EPAR;
 678         if (cflag & CMSPAR)
 679                 cval |= UART_LCR_SPAR;
 680
 681         if ((info->type == PORT_8250) || (info->type == PORT_16450)) {
 682                 if (info->board->chip_flag) {
 683                         fcr = UART_FCR_ENABLE_FIFO;
 684                         fcr |= MOXA_MUST_FCR_GDA_MODE_ENABLE;
 685                         mxser_set_must_fifo_value(info);
 686                 } else
 687                         fcr = 0;
 688         } else {
 689                 fcr = UART_FCR_ENABLE_FIFO;
 690                 if (info->board->chip_flag) {
 691                         fcr |= MOXA_MUST_FCR_GDA_MODE_ENABLE;
 692                         mxser_set_must_fifo_value(info);
 693                 } else {
 694                         switch (info->rx_trigger) {
 695                         case 1:
 696                                 fcr |= UART_FCR_TRIGGER_1;
 697                                 break;
 698                         case 4:
 699                                 fcr |= UART_FCR_TRIGGER_4;
 700                                 break;
 701                         case 8:
 702                                 fcr |= UART_FCR_TRIGGER_8;
 703                                 break;
 704                         default:
 705                                 fcr |= UART_FCR_TRIGGER_14;
 706                                 break;
 707                         }
 708                 }
 709         }
 710
 711         /* CTS flow control flag and modem status interrupts */
 712         info->IER &= ~UART_IER_MSI;
 713         info->MCR &= ~UART_MCR_AFE;
 714         tty_port_set_cts_flow(&info->port, cflag & CRTSCTS);
 715         if (cflag & CRTSCTS) {
 716                 info->IER |= UART_IER_MSI;
 717                 if ((info->type == PORT_16550A) || (info->board->chip_flag)) {
 718                         info->MCR |= UART_MCR_AFE;
 719                 } else {
 720                         status = inb(info->ioaddr + UART_MSR);
 721                         if (tty->hw_stopped) {
 722                                 if (status & UART_MSR_CTS) {
 723                                         tty->hw_stopped = 0;
 724                                         if (info->type != PORT_16550A &&
 725                                                         !info->board->chip_flag) {
 726                                                 outb(info->IER & ~UART_IER_THRI,
 727                                                         info->ioaddr +
 728                                                         UART_IER);
 729                                                 info->IER |= UART_IER_THRI;
 730                                                 outb(info->IER, info->ioaddr +
 731                                                                 UART_IER);
 732                                         }
 733                                         tty_wakeup(tty);
 734                                 }
 735                         } else {
 736                                 if (!(status & UART_MSR_CTS)) {
 737                                         tty->hw_stopped = 1;
 738                                         if ((info->type != PORT_16550A) &&
 739                                                         (!info->board->chip_flag)) {
 740                                                 info->IER &= ~UART_IER_THRI;
 741                                                 outb(info->IER, info->ioaddr +
 742                                                                 UART_IER);
 743                                         }
 744                                 }
 745                         }
 746                 }
 747         }
 748         outb(info->MCR, info->ioaddr + UART_MCR);
 749         tty_port_set_check_carrier(&info->port, ~cflag & CLOCAL);
 750         if (~cflag & CLOCAL)
 751                 info->IER |= UART_IER_MSI;
 752         outb(info->IER, info->ioaddr + UART_IER);
 753
 754         /*
 755          * Set up parity check flag
 756          */
 757         info->read_status_mask = UART_LSR_OE | UART_LSR_THRE | UART_LSR_DR;
 758         if (I_INPCK(tty))
 759                 info->read_status_mask |= UART_LSR_FE | UART_LSR_PE;
 760         if (I_BRKINT(tty) || I_PARMRK(tty))
 761                 info->read_status_mask |= UART_LSR_BI;
 762
 763         info->ignore_status_mask = 0;
 764
 765         if (I_IGNBRK(tty)) {
 766                 info->ignore_status_mask |= UART_LSR_BI;
 767                 info->read_status_mask |= UART_LSR_BI;
 768                 /*
 769                  * If we're ignore parity and break indicators, ignore
 770                  * overruns too.  (For real raw support).
 771                  */
 772                 if (I_IGNPAR(tty)) {
 773                         info->ignore_status_mask |=
 774                                                 UART_LSR_OE |
 775                                                 UART_LSR_PE |
 776                                                 UART_LSR_FE;
 777                         info->read_status_mask |=
 778                                                 UART_LSR_OE |
 779                                                 UART_LSR_PE |
 780                                                 UART_LSR_FE;
 781                 }
 782         }
 783         if (info->board->chip_flag) {
 784                 mxser_set_must_xon1_value(info->ioaddr, START_CHAR(tty));
 785                 mxser_set_must_xoff1_value(info->ioaddr, STOP_CHAR(tty));
 786                 if (I_IXON(tty)) {
 787                         mxser_enable_must_rx_software_flow_control(
 788                                         info->ioaddr);
 789                 } else {
 790                         mxser_disable_must_rx_software_flow_control(
 791                                         info->ioaddr);
 792                 }
 793                 if (I_IXOFF(tty)) {
 794                         mxser_enable_must_tx_software_flow_control(
 795                                         info->ioaddr);
 796                 } else {
 797                         mxser_disable_must_tx_software_flow_control(
 798                                         info->ioaddr);
 799                 }
 800         }
 801
 802
 803         outb(fcr, info->ioaddr + UART_FCR);     /* set fcr */
 804         outb(cval, info->ioaddr + UART_LCR);
 805 }
 806
 807 static void mxser_check_modem_status(struct tty_struct *tty,
 808                                 struct mxser_port *port, int status)
 809 {
 810         /* update input line counters */
 811         if (status & UART_MSR_TERI)
 812                 port->icount.rng++;
 813         if (status & UART_MSR_DDSR)
 814                 port->icount.dsr++;
 815         if (status & UART_MSR_DDCD)
 816                 port->icount.dcd++;
 817         if (status & UART_MSR_DCTS)
 818                 port->icount.cts++;
 819         port->mon_data.modem_status = status;
 820         wake_up_interruptible(&port->port.delta_msr_wait);
 821
 822         if (tty_port_check_carrier(&port->port) && (status & UART_MSR_DDCD)) {
 823                 if (status & UART_MSR_DCD)
 824                         wake_up_interruptible(&port->port.open_wait);
 825         }
 826
 827         if (tty_port_cts_enabled(&port->port)) {
 828                 if (tty->hw_stopped) {
 829                         if (status & UART_MSR_CTS) {
 830                                 tty->hw_stopped = 0;
 831
 832                                 if ((port->type != PORT_16550A) &&
 833                                                 (!port->board->chip_flag)) {
 834                                         outb(port->IER & ~UART_IER_THRI,
 835                                                 port->ioaddr + UART_IER);
 836                                         port->IER |= UART_IER_THRI;
 837                                         outb(port->IER, port->ioaddr +
 838                                                         UART_IER);
 839                                 }
 840                                 tty_wakeup(tty);
 841                         }
 842                 } else {
 843                         if (!(status & UART_MSR_CTS)) {
 844                                 tty->hw_stopped = 1;
 845                                 if (port->type != PORT_16550A &&
 846                                                 !port->board->chip_flag) {
 847                                         port->IER &= ~UART_IER_THRI;
 848                                         outb(port->IER, port->ioaddr +
 849                                                         UART_IER);
 850                                 }
 851                         }
 852                 }
 853         }
 854 }
 855
 856 static int mxser_activate(struct tty_port *port, struct tty_struct *tty)
 857 {
 858         struct mxser_port *info = container_of(port, struct mxser_port, port);
 859         unsigned long page;
 860         unsigned long flags;
 861
 862         page = __get_free_page(GFP_KERNEL);
 863         if (!page)
 864                 return -ENOMEM;
 865
 866         spin_lock_irqsave(&info->slock, flags);
 867
 868         if (!info->ioaddr || !info->type) {
 869                 set_bit(TTY_IO_ERROR, &tty->flags);
 870                 free_page(page);
 871                 spin_unlock_irqrestore(&info->slock, flags);
 872                 return 0;
 873         }
 874         info->port.xmit_buf = (unsigned char *) page;
 875
 876         /*
 877          * Clear the FIFO buffers and disable them
 878          * (they will be reenabled in mxser_change_speed())
 879          */
 880         if (info->board->chip_flag)
 881                 outb((UART_FCR_CLEAR_RCVR |
 882                         UART_FCR_CLEAR_XMIT |
 883                         MOXA_MUST_FCR_GDA_MODE_ENABLE), info->ioaddr + UART_FCR);
 884         else
 885                 outb((UART_FCR_CLEAR_RCVR | UART_FCR_CLEAR_XMIT),
 886                         info->ioaddr + UART_FCR);
 887
 888         /*
 889          * At this point there's no way the LSR could still be 0xFF;
 890          * if it is, then bail out, because there's likely no UART
 891          * here.
 892          */
 893         if (inb(info->ioaddr + UART_LSR) == 0xff) {
 894                 spin_unlock_irqrestore(&info->slock, flags);
 895                 if (capable(CAP_SYS_ADMIN)) {
 896                         set_bit(TTY_IO_ERROR, &tty->flags);
 897                         return 0;
 898                 } else
 899                         return -ENODEV;
 900         }
 901
 902         /*
 903          * Clear the interrupt registers.
 904          */
 905         (void) inb(info->ioaddr + UART_LSR);
 906         (void) inb(info->ioaddr + UART_RX);
 907         (void) inb(info->ioaddr + UART_IIR);
 908         (void) inb(info->ioaddr + UART_MSR);
 909
 910         /*
 911          * Now, initialize the UART
 912          */
 913         outb(UART_LCR_WLEN8, info->ioaddr + UART_LCR);  /* reset DLAB */
 914         info->MCR = UART_MCR_DTR | UART_MCR_RTS;
 915         outb(info->MCR, info->ioaddr + UART_MCR);
 916
 917         /*
 918          * Finally, enable interrupts
 919          */
 920         info->IER = UART_IER_MSI | UART_IER_RLSI | UART_IER_RDI;
 921
 922         if (info->board->chip_flag)
 923                 info->IER |= MOXA_MUST_IER_EGDAI;
 924         outb(info->IER, info->ioaddr + UART_IER);       /* enable interrupts */
 925
 926         /*
 927          * And clear the interrupt registers again for luck.
 928          */
 929         (void) inb(info->ioaddr + UART_LSR);
 930         (void) inb(info->ioaddr + UART_RX);
 931         (void) inb(info->ioaddr + UART_IIR);
 932         (void) inb(info->ioaddr + UART_MSR);
 933
 934         clear_bit(TTY_IO_ERROR, &tty->flags);
 935         info->xmit_cnt = info->xmit_head = info->xmit_tail = 0;
 936
 937         /*
 938          * and set the speed of the serial port
 939          */
 940         mxser_change_speed(tty);
 941         spin_unlock_irqrestore(&info->slock, flags);
 942
 943         return 0;
 944 }
 945
 946 /*
 947  * This routine will shutdown a serial port
 948  */
 949 static void mxser_shutdown_port(struct tty_port *port)
 950 {
 951         struct mxser_port *info = container_of(port, struct mxser_port, port);
 952         unsigned long flags;
 953
 954         spin_lock_irqsave(&info->slock, flags);
 955
 956         /*
 957          * clear delta_msr_wait queue to avoid mem leaks: we may free the irq
 958          * here so the queue might never be waken up
 959          */
 960         wake_up_interruptible(&info->port.delta_msr_wait);
 961
 962         /*
 963          * Free the xmit buffer, if necessary
 964          */
 965         if (info->port.xmit_buf) {
 966                 free_page((unsigned long) info->port.xmit_buf);
 967                 info->port.xmit_buf = NULL;
 968         }
 969
 970         info->IER = 0;
 971         outb(0x00, info->ioaddr + UART_IER);
 972
 973         /* clear Rx/Tx FIFO's */
 974         if (info->board->chip_flag)
 975                 outb(UART_FCR_CLEAR_RCVR | UART_FCR_CLEAR_XMIT |
 976                                 MOXA_MUST_FCR_GDA_MODE_ENABLE,
 977                                 info->ioaddr + UART_FCR);
 978         else
 979                 outb(UART_FCR_CLEAR_RCVR | UART_FCR_CLEAR_XMIT,
 980                         info->ioaddr + UART_FCR);
 981
 982         /* read data port to reset things */
 983         (void) inb(info->ioaddr + UART_RX);
 984
 985
 986         if (info->board->chip_flag)
 987                 SET_MOXA_MUST_NO_SOFTWARE_FLOW_CONTROL(info->ioaddr);
 988
 989         spin_unlock_irqrestore(&info->slock, flags);
 990 }
 991
 992 /*
 993  * This routine is called whenever a serial port is opened.  It
 994  * enables interrupts for a serial port, linking in its async structure into
 995  * the IRQ chain.   It also performs the serial-specific
 996  * initialization for the tty structure.
 997  */
 998 static int mxser_open(struct tty_struct *tty, struct file *filp)
 999 {
1000         struct mxser_port *info;
1001         int line;
1002
1003         line = tty->index;
1004         if (line == MXSER_PORTS)
1005                 return 0;
1006         info = &mxser_boards[line / MXSER_PORTS_PER_BOARD].ports[line % MXSER_PORTS_PER_BOARD];
1007         if (!info->ioaddr)
1008                 return -ENODEV;
1009
1010         tty->driver_data = info;
1011         return tty_port_open(&info->port, tty, filp);
1012 }
1013
1014 static void mxser_flush_buffer(struct tty_struct *tty)
1015 {
1016         struct mxser_port *info = tty->driver_data;
1017         char fcr;
1018         unsigned long flags;
1019
1020
1021         spin_lock_irqsave(&info->slock, flags);
1022         info->xmit_cnt = info->xmit_head = info->xmit_tail = 0;
1023
1024         fcr = inb(info->ioaddr + UART_FCR);
1025         outb((fcr | UART_FCR_CLEAR_RCVR | UART_FCR_CLEAR_XMIT),
1026                 info->ioaddr + UART_FCR);
1027         outb(fcr, info->ioaddr + UART_FCR);
1028
1029         spin_unlock_irqrestore(&info->slock, flags);
1030
1031         tty_wakeup(tty);
1032 }
1033
1034
1035 static void mxser_close_port(struct tty_port *port)
1036 {
1037         struct mxser_port *info = container_of(port, struct mxser_port, port);
1038         unsigned long timeout;
1039         /*
1040          * At this point we stop accepting input.  To do this, we
1041          * disable the receive line status interrupts, and tell the
1042          * interrupt driver to stop checking the data ready bit in the
1043          * line status register.
1044          */
1045         info->IER &= ~UART_IER_RLSI;
1046         if (info->board->chip_flag)
1047                 info->IER &= ~MOXA_MUST_RECV_ISR;
1048
1049         outb(info->IER, info->ioaddr + UART_IER);
1050         /*
1051          * Before we drop DTR, make sure the UART transmitter
1052          * has completely drained; this is especially
1053          * important if there is a transmit FIFO!
1054          */
1055         timeout = jiffies + HZ;
1056         while (!(inb(info->ioaddr + UART_LSR) & UART_LSR_TEMT)) {
1057                 schedule_timeout_interruptible(5);
1058                 if (time_after(jiffies, timeout))
1059                         break;
1060         }
1061 }
1062
1063 /*
1064  * This routine is called when the serial port gets closed.  First, we
1065  * wait for the last remaining data to be sent.  Then, we unlink its
1066  * async structure from the interrupt chain if necessary, and we free
1067  * that IRQ if nothing is left in the chain.
1068  */
1069 static void mxser_close(struct tty_struct *tty, struct file *filp)
1070 {
1071         struct mxser_port *info = tty->driver_data;
1072         struct tty_port *port = &info->port;
1073
1074         if (tty->index == MXSER_PORTS || info == NULL)
1075                 return;
1076         if (tty_port_close_start(port, tty, filp) == 0)
1077                 return;
1078         info->closing = 1;
1079         mutex_lock(&port->mutex);
1080         mxser_close_port(port);
1081         mxser_flush_buffer(tty);
1082         if (tty_port_initialized(port) && C_HUPCL(tty))
1083                 tty_port_lower_dtr_rts(port);
1084         mxser_shutdown_port(port);
1085         tty_port_set_initialized(port, 0);
1086         mutex_unlock(&port->mutex);
1087         info->closing = 0;
1088         /* Right now the tty_port set is done outside of the close_end helper
1089            as we don't yet have everyone using refcounts */
1090         tty_port_close_end(port, tty);
1091         tty_port_tty_set(port, NULL);
1092 }
1093
1094 static int mxser_write(struct tty_struct *tty, const unsigned char *buf, int count)
1095 {
1096         int c, total = 0;
1097         struct mxser_port *info = tty->driver_data;
1098         unsigned long flags;
1099
1100         if (!info->port.xmit_buf)
1101                 return 0;
1102
1103         while (1) {
1104                 c = min_t(int, count, min(SERIAL_XMIT_SIZE - info->xmit_cnt - 1,
1105                                           SERIAL_XMIT_SIZE - info->xmit_head));
1106                 if (c <= 0)
1107                         break;
1108
1109                 memcpy(info->port.xmit_buf + info->xmit_head, buf, c);
1110                 spin_lock_irqsave(&info->slock, flags);
1111                 info->xmit_head = (info->xmit_head + c) &
1112                                   (SERIAL_XMIT_SIZE - 1);
1113                 info->xmit_cnt += c;
1114                 spin_unlock_irqrestore(&info->slock, flags);
1115
1116                 buf += c;
1117                 count -= c;
1118                 total += c;
1119         }
1120
1121         if (info->xmit_cnt && !tty->stopped) {
1122                 if (!tty->hw_stopped ||
1123                                 (info->type == PORT_16550A) ||
1124                                 (info->board->chip_flag)) {
1125                         spin_lock_irqsave(&info->slock, flags);
1126                         outb(info->IER & ~UART_IER_THRI, info->ioaddr +
1127                                         UART_IER);
1128                         info->IER |= UART_IER_THRI;
1129                         outb(info->IER, info->ioaddr + UART_IER);
1130                         spin_unlock_irqrestore(&info->slock, flags);
1131                 }
1132         }
1133         return total;
1134 }
1135
1136 static int mxser_put_char(struct tty_struct *tty, unsigned char ch)
1137 {
1138         struct mxser_port *info = tty->driver_data;
1139         unsigned long flags;
1140
1141         if (!info->port.xmit_buf)
1142                 return 0;
1143
1144         if (info->xmit_cnt >= SERIAL_XMIT_SIZE - 1)
1145                 return 0;
1146
1147         spin_lock_irqsave(&info->slock, flags);
1148         info->port.xmit_buf[info->xmit_head++] = ch;
1149         info->xmit_head &= SERIAL_XMIT_SIZE - 1;
1150         info->xmit_cnt++;
1151         spin_unlock_irqrestore(&info->slock, flags);
1152         if (!tty->stopped) {
1153                 if (!tty->hw_stopped ||
1154                                 (info->type == PORT_16550A) ||
1155                                 info->board->chip_flag) {
1156                         spin_lock_irqsave(&info->slock, flags);
1157                         outb(info->IER & ~UART_IER_THRI, info->ioaddr + UART_IER);
1158                         info->IER |= UART_IER_THRI;
1159                         outb(info->IER, info->ioaddr + UART_IER);
1160                         spin_unlock_irqrestore(&info->slock, flags);
1161                 }
1162         }
1163         return 1;
1164 }
1165
1166
1167 static void mxser_flush_chars(struct tty_struct *tty)
1168 {
1169         struct mxser_port *info = tty->driver_data;
1170         unsigned long flags;
1171
1172         if (info->xmit_cnt <= 0 || tty->stopped || !info->port.xmit_buf ||
1173                         (tty->hw_stopped && info->type != PORT_16550A &&
1174                          !info->board->chip_flag))
1175                 return;
1176
1177         spin_lock_irqsave(&info->slock, flags);
1178
1179         outb(info->IER & ~UART_IER_THRI, info->ioaddr + UART_IER);
1180         info->IER |= UART_IER_THRI;
1181         outb(info->IER, info->ioaddr + UART_IER);
1182
1183         spin_unlock_irqrestore(&info->slock, flags);
1184 }
1185
1186 static int mxser_write_room(struct tty_struct *tty)
1187 {
1188         struct mxser_port *info = tty->driver_data;
1189         int ret;
1190
1191         ret = SERIAL_XMIT_SIZE - info->xmit_cnt - 1;
1192         return ret < 0 ? 0 : ret;
1193 }
1194
1195 static int mxser_chars_in_buffer(struct tty_struct *tty)
1196 {
1197         struct mxser_port *info = tty->driver_data;
1198         return info->xmit_cnt;
1199 }
1200
1201 /*
1202  * ------------------------------------------------------------
1203  * friends of mxser_ioctl()
1204  * ------------------------------------------------------------
1205  */
1206 static int mxser_get_serial_info(struct tty_struct *tty,
1207                 struct serial_struct *ss)
1208 {
1209         struct mxser_port *info = tty->driver_data;
1210         struct tty_port *port = &info->port;
1211         unsigned int closing_wait, close_delay;
1212
1213         if (tty->index == MXSER_PORTS)
1214                 return -ENOTTY;
1215
1216         mutex_lock(&port->mutex);
1217
1218         close_delay = jiffies_to_msecs(info->port.close_delay) / 10;
1219         closing_wait = info->port.closing_wait;
1220         if (closing_wait != ASYNC_CLOSING_WAIT_NONE)
1221                 closing_wait = jiffies_to_msecs(closing_wait) / 10;
1222
1223         ss->type = info->type,
1224         ss->line = tty->index,
1225         ss->port = info->ioaddr,
1226         ss->irq = info->board->irq,
1227         ss->flags = info->port.flags,
1228         ss->baud_base = info->baud_base,
1229         ss->close_delay = close_delay;
1230         ss->closing_wait = closing_wait;
1231         ss->custom_divisor = info->custom_divisor,
1232         mutex_unlock(&port->mutex);
1233         return 0;
1234 }
1235
1236 static int mxser_set_serial_info(struct tty_struct *tty,
1237                 struct serial_struct *ss)
1238 {
1239         struct mxser_port *info = tty->driver_data;
1240         struct tty_port *port = &info->port;
1241         speed_t baud;
1242         unsigned long sl_flags;
1243         unsigned int flags, close_delay, closing_wait;
1244         int retval = 0;
1245
1246         if (tty->index == MXSER_PORTS)
1247                 return -ENOTTY;
1248         if (tty_io_error(tty))
1249                 return -EIO;
1250
1251         mutex_lock(&port->mutex);
1252         if (!info->ioaddr) {
1253                 mutex_unlock(&port->mutex);
1254                 return -ENODEV;
1255         }
1256
1257         if (ss->irq != info->board->irq ||
1258                         ss->port != info->ioaddr) {
1259                 mutex_unlock(&port->mutex);
1260                 return -EINVAL;
1261         }
1262
1263         flags = port->flags & ASYNC_SPD_MASK;
1264
1265         close_delay = msecs_to_jiffies(ss->close_delay * 10);
1266         closing_wait = ss->closing_wait;
1267         if (closing_wait != ASYNC_CLOSING_WAIT_NONE)
1268                 closing_wait = msecs_to_jiffies(closing_wait * 10);
1269
1270         if (!capable(CAP_SYS_ADMIN)) {
1271                 if ((ss->baud_base != info->baud_base) ||
1272                                 (close_delay != info->port.close_delay) ||
1273                                 (closing_wait != info->port.closing_wait) ||
1274                                 ((ss->flags & ~ASYNC_USR_MASK) != (info->port.flags & ~ASYNC_USR_MASK))) {
1275                         mutex_unlock(&port->mutex);
1276                         return -EPERM;
1277                 }
1278                 info->port.flags = ((info->port.flags & ~ASYNC_USR_MASK) |
1279                                 (ss->flags & ASYNC_USR_MASK));
1280         } else {
1281                 /*
1282                  * OK, past this point, all the error checking has been done.
1283                  * At this point, we start making changes.....
1284                  */
1285                 port->flags = ((port->flags & ~ASYNC_FLAGS) |
1286                                 (ss->flags & ASYNC_FLAGS));
1287                 port->close_delay = close_delay;
1288                 port->closing_wait = closing_wait;
1289                 if ((port->flags & ASYNC_SPD_MASK) == ASYNC_SPD_CUST &&
1290                                 (ss->baud_base != info->baud_base ||
1291                                 ss->custom_divisor !=
1292                                 info->custom_divisor)) {
1293                         if (ss->custom_divisor == 0) {
1294                                 mutex_unlock(&port->mutex);
1295                                 return -EINVAL;
1296                         }
1297                         baud = ss->baud_base / ss->custom_divisor;
1298                         tty_encode_baud_rate(tty, baud, baud);
1299                 }
1300
1301                 info->type = ss->type;
1302
1303                 process_txrx_fifo(info);
1304         }
1305
1306         if (tty_port_initialized(port)) {
1307                 if (flags != (port->flags & ASYNC_SPD_MASK)) {
1308                         spin_lock_irqsave(&info->slock, sl_flags);
1309                         mxser_change_speed(tty);
1310                         spin_unlock_irqrestore(&info->slock, sl_flags);
1311                 }
1312         } else {
1313                 retval = mxser_activate(port, tty);
1314                 if (retval == 0)
1315                         tty_port_set_initialized(port, 1);
1316         }
1317         mutex_unlock(&port->mutex);
1318         return retval;
1319 }
1320
1321 /*
1322  * mxser_get_lsr_info - get line status register info
1323  *
1324  * Purpose: Let user call ioctl() to get info when the UART physically
1325  *          is emptied.  On bus types like RS485, the transmitter must
1326  *          release the bus after transmitting. This must be done when
1327  *          the transmit shift register is empty, not be done when the
1328  *          transmit holding register is empty.  This functionality
1329  *          allows an RS485 driver to be written in user space.
1330  */
1331 static int mxser_get_lsr_info(struct mxser_port *info,
1332                 unsigned int __user *value)
1333 {
1334         unsigned char status;
1335         unsigned int result;
1336         unsigned long flags;
1337
1338         spin_lock_irqsave(&info->slock, flags);
1339         status = inb(info->ioaddr + UART_LSR);
1340         spin_unlock_irqrestore(&info->slock, flags);
1341         result = ((status & UART_LSR_TEMT) ? TIOCSER_TEMT : 0);
1342         return put_user(result, value);
1343 }
1344
1345 static int mxser_tiocmget(struct tty_struct *tty)
1346 {
1347         struct mxser_port *info = tty->driver_data;
1348         unsigned char control, status;
1349         unsigned long flags;
1350
1351
1352         if (tty->index == MXSER_PORTS)
1353                 return -ENOIOCTLCMD;
1354         if (tty_io_error(tty))
1355                 return -EIO;
1356
1357         control = info->MCR;
1358
1359         spin_lock_irqsave(&info->slock, flags);
1360         status = inb(info->ioaddr + UART_MSR);
1361         if (status & UART_MSR_ANY_DELTA)
1362                 mxser_check_modem_status(tty, info, status);
1363         spin_unlock_irqrestore(&info->slock, flags);
1364         return ((control & UART_MCR_RTS) ? TIOCM_RTS : 0) |
1365                     ((control & UART_MCR_DTR) ? TIOCM_DTR : 0) |
1366                     ((status & UART_MSR_DCD) ? TIOCM_CAR : 0) |
1367                     ((status & UART_MSR_RI) ? TIOCM_RNG : 0) |
1368                     ((status & UART_MSR_DSR) ? TIOCM_DSR : 0) |
1369                     ((status & UART_MSR_CTS) ? TIOCM_CTS : 0);
1370 }
1371
1372 static int mxser_tiocmset(struct tty_struct *tty,
1373                 unsigned int set, unsigned int clear)
1374 {
1375         struct mxser_port *info = tty->driver_data;
1376         unsigned long flags;
1377
1378
1379         if (tty->index == MXSER_PORTS)
1380                 return -ENOIOCTLCMD;
1381         if (tty_io_error(tty))
1382                 return -EIO;
1383
1384         spin_lock_irqsave(&info->slock, flags);
1385
1386         if (set & TIOCM_RTS)
1387                 info->MCR |= UART_MCR_RTS;
1388         if (set & TIOCM_DTR)
1389                 info->MCR |= UART_MCR_DTR;
1390
1391         if (clear & TIOCM_RTS)
1392                 info->MCR &= ~UART_MCR_RTS;
1393         if (clear & TIOCM_DTR)
1394                 info->MCR &= ~UART_MCR_DTR;
1395
1396         outb(info->MCR, info->ioaddr + UART_MCR);
1397         spin_unlock_irqrestore(&info->slock, flags);
1398         return 0;
1399 }
1400
1401 static int __init mxser_program_mode(int port)
1402 {
1403         int id, i, j, n;
1404
1405         outb(0, port);
1406         outb(0, port);
1407         outb(0, port);
1408         (void)inb(port);
1409         (void)inb(port);
1410         outb(0, port);
1411         (void)inb(port);
1412
1413         id = inb(port + 1) & 0x1F;
1414         if ((id != C168_ASIC_ID) &&
1415                         (id != C104_ASIC_ID) &&
1416                         (id != C102_ASIC_ID) &&
1417                         (id != CI132_ASIC_ID) &&
1418                         (id != CI134_ASIC_ID) &&
1419                         (id != CI104J_ASIC_ID))
1420                 return -1;
1421         for (i = 0, j = 0; i < 4; i++) {
1422                 n = inb(port + 2);
1423                 if (n == 'M') {
1424                         j = 1;
1425                 } else if ((j == 1) && (n == 1)) {
1426                         j = 2;
1427                         break;
1428                 } else
1429                         j = 0;
1430         }
1431         if (j != 2)
1432                 id = -2;
1433         return id;
1434 }
1435
1436 static void __init mxser_normal_mode(int port)
1437 {
1438         int i, n;
1439
1440         outb(0xA5, port + 1);
1441         outb(0x80, port + 3);
1442         outb(12, port + 0);     /* 9600 bps */
1443         outb(0, port + 1);
1444         outb(0x03, port + 3);   /* 8 data bits */
1445         outb(0x13, port + 4);   /* loop back mode */
1446         for (i = 0; i < 16; i++) {
1447                 n = inb(port + 5);
1448                 if ((n & 0x61) == 0x60)
1449                         break;
1450                 if ((n & 1) == 1)
1451                         (void)inb(port);
1452         }
1453         outb(0x00, port + 4);
1454 }
1455
1456 #define CHIP_SK         0x01    /* Serial Data Clock  in Eprom */
1457 #define CHIP_DO         0x02    /* Serial Data Output in Eprom */
1458 #define CHIP_CS         0x04    /* Serial Chip Select in Eprom */
1459 #define CHIP_DI         0x08    /* Serial Data Input  in Eprom */
1460 #define EN_CCMD         0x000   /* Chip's command register     */
1461 #define EN0_RSARLO      0x008   /* Remote start address reg 0  */
1462 #define EN0_RSARHI      0x009   /* Remote start address reg 1  */
1463 #define EN0_RCNTLO      0x00A   /* Remote byte count reg WR    */
1464 #define EN0_RCNTHI      0x00B   /* Remote byte count reg WR    */
1465 #define EN0_DCFG        0x00E   /* Data configuration reg WR   */
1466 #define EN0_PORT        0x010   /* Rcv missed frame error counter RD */
1467 #define ENC_PAGE0       0x000   /* Select page 0 of chip registers   */
1468 #define ENC_PAGE3       0x0C0   /* Select page 3 of chip registers   */
1469 static int __init mxser_read_register(int port, unsigned short *regs)
1470 {
1471         int i, k, value, id;
1472         unsigned int j;
1473
1474         id = mxser_program_mode(port);
1475         if (id < 0)
1476                 return id;
1477         for (i = 0; i < 14; i++) {
1478                 k = (i & 0x3F) | 0x180;
1479                 for (j = 0x100; j > 0; j >>= 1) {
1480                         outb(CHIP_CS, port);
1481                         if (k & j) {
1482                                 outb(CHIP_CS | CHIP_DO, port);
1483                                 outb(CHIP_CS | CHIP_DO | CHIP_SK, port);        /* A? bit of read */
1484                         } else {
1485                                 outb(CHIP_CS, port);
1486                                 outb(CHIP_CS | CHIP_SK, port);  /* A? bit of read */
1487                         }
1488                 }
1489                 (void)inb(port);
1490                 value = 0;
1491                 for (k = 0, j = 0x8000; k < 16; k++, j >>= 1) {
1492                         outb(CHIP_CS, port);
1493                         outb(CHIP_CS | CHIP_SK, port);
1494                         if (inb(port) & CHIP_DI)
1495                                 value |= j;
1496                 }
1497                 regs[i] = value;
1498                 outb(0, port);
1499         }
1500         mxser_normal_mode(port);
1501         return id;
1502 }
1503
1504 static int mxser_ioctl_special(unsigned int cmd, void __user *argp)
1505 {
1506         struct mxser_port *ip;
1507         struct tty_port *port;
1508         struct tty_struct *tty;
1509         int result, status;
1510         unsigned int i, j;
1511         int ret = 0;
1512
1513         switch (cmd) {
1514         case MOXA_GET_MAJOR:
1515                 printk_ratelimited(KERN_WARNING "mxser: '%s' uses deprecated ioctl "
1516                                         "%x (GET_MAJOR), fix your userspace\n",
1517                                         current->comm, cmd);
1518                 return put_user(ttymajor, (int __user *)argp);
1519
1520         case MOXA_CHKPORTENABLE:
1521                 result = 0;
1522                 for (i = 0; i < MXSER_BOARDS; i++)
1523                         for (j = 0; j < MXSER_PORTS_PER_BOARD; j++)
1524                                 if (mxser_boards[i].ports[j].ioaddr)
1525                                         result |= (1 << i);
1526                 return put_user(result, (unsigned long __user *)argp);
1527         case MOXA_GETDATACOUNT:
1528                 /* The receive side is locked by port->slock but it isn't
1529                    clear that an exact snapshot is worth copying here */
1530                 if (copy_to_user(argp, &mxvar_log, sizeof(mxvar_log)))
1531                         ret = -EFAULT;
1532                 return ret;
1533         case MOXA_GETMSTATUS: {
1534                 struct mxser_mstatus ms, __user *msu = argp;
1535                 for (i = 0; i < MXSER_BOARDS; i++)
1536                         for (j = 0; j < MXSER_PORTS_PER_BOARD; j++) {
1537                                 ip = &mxser_boards[i].ports[j];
1538                                 port = &ip->port;
1539                                 memset(&ms, 0, sizeof(ms));
1540
1541                                 mutex_lock(&port->mutex);
1542                                 if (!ip->ioaddr)
1543                                         goto copy;
1544
1545                                 tty = tty_port_tty_get(port);
1546
1547                                 if (!tty)
1548                                         ms.cflag = ip->normal_termios.c_cflag;
1549                                 else
1550                                         ms.cflag = tty->termios.c_cflag;
1551                                 tty_kref_put(tty);
1552                                 spin_lock_irq(&ip->slock);
1553                                 status = inb(ip->ioaddr + UART_MSR);
1554                                 spin_unlock_irq(&ip->slock);
1555                                 if (status & UART_MSR_DCD)
1556                                         ms.dcd = 1;
1557                                 if (status & UART_MSR_DSR)
1558                                         ms.dsr = 1;
1559                                 if (status & UART_MSR_CTS)
1560                                         ms.cts = 1;
1561                         copy:
1562                                 mutex_unlock(&port->mutex);
1563                                 if (copy_to_user(msu, &ms, sizeof(ms)))
1564                                         return -EFAULT;
1565                                 msu++;
1566                         }
1567                 return 0;
1568         }
1569         case MOXA_ASPP_MON_EXT: {
1570                 struct mxser_mon_ext *me; /* it's 2k, stack unfriendly */
1571                 unsigned int cflag, iflag, p;
1572                 u8 opmode;
1573
1574                 me = kzalloc(sizeof(*me), GFP_KERNEL);
1575                 if (!me)
1576                         return -ENOMEM;
1577
1578                 for (i = 0, p = 0; i < MXSER_BOARDS; i++) {
1579                         for (j = 0; j < MXSER_PORTS_PER_BOARD; j++, p++) {
1580                                 if (p >= ARRAY_SIZE(me->rx_cnt)) {
1581                                         i = MXSER_BOARDS;
1582                                         break;
1583                                 }
1584                                 ip = &mxser_boards[i].ports[j];
1585                                 port = &ip->port;
1586
1587                                 mutex_lock(&port->mutex);
1588                                 if (!ip->ioaddr) {
1589                                         mutex_unlock(&port->mutex);
1590                                         continue;
1591                                 }
1592
1593                                 spin_lock_irq(&ip->slock);
1594                                 status = mxser_get_msr(ip->ioaddr, 0, p);
1595
1596                                 if (status & UART_MSR_TERI)
1597                                         ip->icount.rng++;
1598                                 if (status & UART_MSR_DDSR)
1599                                         ip->icount.dsr++;
1600                                 if (status & UART_MSR_DDCD)
1601                                         ip->icount.dcd++;
1602                                 if (status & UART_MSR_DCTS)
1603                                         ip->icount.cts++;
1604
1605                                 ip->mon_data.modem_status = status;
1606                                 me->rx_cnt[p] = ip->mon_data.rxcnt;
1607                                 me->tx_cnt[p] = ip->mon_data.txcnt;
1608                                 me->up_rxcnt[p] = ip->mon_data.up_rxcnt;
1609                                 me->up_txcnt[p] = ip->mon_data.up_txcnt;
1610                                 me->modem_status[p] =
1611                                         ip->mon_data.modem_status;
1612                                 spin_unlock_irq(&ip->slock);
1613
1614                                 tty = tty_port_tty_get(&ip->port);
1615
1616                                 if (!tty) {
1617                                         cflag = ip->normal_termios.c_cflag;
1618                                         iflag = ip->normal_termios.c_iflag;
1619                                         me->baudrate[p] = tty_termios_baud_rate(&ip->normal_termios);
1620                                 } else {
1621                                         cflag = tty->termios.c_cflag;
1622                                         iflag = tty->termios.c_iflag;
1623                                         me->baudrate[p] = tty_get_baud_rate(tty);
1624                                 }
1625                                 tty_kref_put(tty);
1626
1627                                 me->databits[p] = cflag & CSIZE;
1628                                 me->stopbits[p] = cflag & CSTOPB;
1629                                 me->parity[p] = cflag & (PARENB | PARODD |
1630                                                 CMSPAR);
1631
1632                                 if (cflag & CRTSCTS)
1633                                         me->flowctrl[p] |= 0x03;
1634
1635                                 if (iflag & (IXON | IXOFF))
1636                                         me->flowctrl[p] |= 0x0C;
1637
1638                                 if (ip->type == PORT_16550A)
1639                                         me->fifo[p] = 1;
1640
1641                                 if (ip->board->chip_flag == MOXA_MUST_MU860_HWID) {
1642                                         opmode = inb(ip->opmode_ioaddr)>>((p % 4) * 2);
1643                                         opmode &= OP_MODE_MASK;
1644                                 } else {
1645                                         opmode = RS232_MODE;
1646                                 }
1647                                 me->iftype[p] = opmode;
1648                                 mutex_unlock(&port->mutex);
1649                         }
1650                 }
1651                 if (copy_to_user(argp, me, sizeof(*me)))
1652                         ret = -EFAULT;
1653                 kfree(me);
1654                 return ret;
1655         }
1656         default:
1657                 return -ENOIOCTLCMD;
1658         }
1659         return 0;
1660 }
1661
1662 static int mxser_cflags_changed(struct mxser_port *info, unsigned long arg,
1663                 struct async_icount *cprev)
1664 {
1665         struct async_icount cnow;
1666         unsigned long flags;
1667         int ret;
1668
1669         spin_lock_irqsave(&info->slock, flags);
1670         cnow = info->icount;    /* atomic copy */
1671         spin_unlock_irqrestore(&info->slock, flags);
1672
1673         ret =   ((arg & TIOCM_RNG) && (cnow.rng != cprev->rng)) ||
1674                 ((arg & TIOCM_DSR) && (cnow.dsr != cprev->dsr)) ||
1675                 ((arg & TIOCM_CD)  && (cnow.dcd != cprev->dcd)) ||
1676                 ((arg & TIOCM_CTS) && (cnow.cts != cprev->cts));
1677
1678         *cprev = cnow;
1679
1680         return ret;
1681 }
1682
1683 static int mxser_ioctl(struct tty_struct *tty,
1684                 unsigned int cmd, unsigned long arg)
1685 {
1686         struct mxser_port *info = tty->driver_data;
1687         struct async_icount cnow;
1688         unsigned long flags;
1689         void __user *argp = (void __user *)arg;
1690
1691         if (tty->index == MXSER_PORTS)
1692                 return mxser_ioctl_special(cmd, argp);
1693
1694         if (cmd == MOXA_SET_OP_MODE || cmd == MOXA_GET_OP_MODE) {
1695                 int p;
1696                 unsigned long opmode;
1697                 static unsigned char ModeMask[] = { 0xfc, 0xf3, 0xcf, 0x3f };
1698                 int shiftbit;
1699                 unsigned char val, mask;
1700
1701                 if (info->board->chip_flag != MOXA_MUST_MU860_HWID)
1702                         return -EFAULT;
1703
1704                 p = tty->index % 4;
1705                 if (cmd == MOXA_SET_OP_MODE) {
1706                         if (get_user(opmode, (int __user *) argp))
1707                                 return -EFAULT;
1708                         if (opmode != RS232_MODE &&
1709                                         opmode != RS485_2WIRE_MODE &&
1710                                         opmode != RS422_MODE &&
1711                                         opmode != RS485_4WIRE_MODE)
1712                                 return -EFAULT;
1713                         mask = ModeMask[p];
1714                         shiftbit = p * 2;
1715                         spin_lock_irq(&info->slock);
1716                         val = inb(info->opmode_ioaddr);
1717                         val &= mask;
1718                         val |= (opmode << shiftbit);
1719                         outb(val, info->opmode_ioaddr);
1720                         spin_unlock_irq(&info->slock);
1721                 } else {
1722                         shiftbit = p * 2;
1723                         spin_lock_irq(&info->slock);
1724                         opmode = inb(info->opmode_ioaddr) >> shiftbit;
1725                         spin_unlock_irq(&info->slock);
1726                         opmode &= OP_MODE_MASK;
1727                         if (put_user(opmode, (int __user *)argp))
1728                                 return -EFAULT;
1729                 }
1730                 return 0;
1731         }
1732
1733         if (cmd != TIOCMIWAIT && tty_io_error(tty))
1734                 return -EIO;
1735
1736         switch (cmd) {
1737         case TIOCSERGETLSR:     /* Get line status register */
1738                 return  mxser_get_lsr_info(info, argp);
1739                 /*
1740                  * Wait for any of the 4 modem inputs (DCD,RI,DSR,CTS) to change
1741                  * - mask passed in arg for lines of interest
1742                  *   (use |'ed TIOCM_RNG/DSR/CD/CTS for masking)
1743                  * Caller should use TIOCGICOUNT to see which one it was
1744                  */
1745         case TIOCMIWAIT:
1746                 spin_lock_irqsave(&info->slock, flags);
1747                 cnow = info->icount;    /* note the counters on entry */
1748                 spin_unlock_irqrestore(&info->slock, flags);
1749
1750                 return wait_event_interruptible(info->port.delta_msr_wait,
1751                                 mxser_cflags_changed(info, arg, &cnow));
1752         case MOXA_HighSpeedOn:
1753                 return put_user(info->baud_base != 115200 ? 1 : 0, (int __user *)argp);
1754         case MOXA_SDS_RSTICOUNTER:
1755                 spin_lock_irq(&info->slock);
1756                 info->mon_data.rxcnt = 0;
1757                 info->mon_data.txcnt = 0;
1758                 spin_unlock_irq(&info->slock);
1759                 return 0;
1760
1761         case MOXA_ASPP_OQUEUE:{
1762                 int len, lsr;
1763
1764                 len = mxser_chars_in_buffer(tty);
1765                 spin_lock_irq(&info->slock);
1766                 lsr = inb(info->ioaddr + UART_LSR) & UART_LSR_THRE;
1767                 spin_unlock_irq(&info->slock);
1768                 len += (lsr ? 0 : 1);
1769
1770                 return put_user(len, (int __user *)argp);
1771         }
1772         case MOXA_ASPP_MON: {
1773                 int mcr, status;
1774
1775                 spin_lock_irq(&info->slock);
1776                 status = mxser_get_msr(info->ioaddr, 1, tty->index);
1777                 mxser_check_modem_status(tty, info, status);
1778
1779                 mcr = inb(info->ioaddr + UART_MCR);
1780                 spin_unlock_irq(&info->slock);
1781
1782                 if (mcr & MOXA_MUST_MCR_XON_FLAG)
1783                         info->mon_data.hold_reason &= ~NPPI_NOTIFY_XOFFHOLD;
1784                 else
1785                         info->mon_data.hold_reason |= NPPI_NOTIFY_XOFFHOLD;
1786
1787                 if (mcr & MOXA_MUST_MCR_TX_XON)
1788                         info->mon_data.hold_reason &= ~NPPI_NOTIFY_XOFFXENT;
1789                 else
1790                         info->mon_data.hold_reason |= NPPI_NOTIFY_XOFFXENT;
1791
1792                 if (tty->hw_stopped)
1793                         info->mon_data.hold_reason |= NPPI_NOTIFY_CTSHOLD;
1794                 else
1795                         info->mon_data.hold_reason &= ~NPPI_NOTIFY_CTSHOLD;
1796
1797                 if (copy_to_user(argp, &info->mon_data,
1798                                 sizeof(struct mxser_mon)))
1799                         return -EFAULT;
1800
1801                 return 0;
1802         }
1803         case MOXA_ASPP_LSTATUS: {
1804                 if (put_user(info->err_shadow, (unsigned char __user *)argp))
1805                         return -EFAULT;
1806
1807                 info->err_shadow = 0;
1808                 return 0;
1809         }
1810         case MOXA_SET_BAUD_METHOD: {
1811                 int method;
1812
1813                 if (get_user(method, (int __user *)argp))
1814                         return -EFAULT;
1815                 mxser_set_baud_method[tty->index] = method;
1816                 return put_user(method, (int __user *)argp);
1817         }
1818         default:
1819                 return -ENOIOCTLCMD;
1820         }
1821         return 0;
1822 }
1823
1824         /*
1825          * Get counter of input serial line interrupts (DCD,RI,DSR,CTS)
1826          * Return: write counters to the user passed counter struct
1827          * NB: both 1->0 and 0->1 transitions are counted except for
1828          *     RI where only 0->1 is counted.
1829          */
1830
1831 static int mxser_get_icount(struct tty_struct *tty,
1832                 struct serial_icounter_struct *icount)
1833
1834 {
1835         struct mxser_port *info = tty->driver_data;
1836         struct async_icount cnow;
1837         unsigned long flags;
1838
1839         spin_lock_irqsave(&info->slock, flags);
1840         cnow = info->icount;
1841         spin_unlock_irqrestore(&info->slock, flags);
1842
1843         icount->frame = cnow.frame;
1844         icount->brk = cnow.brk;
1845         icount->overrun = cnow.overrun;
1846         icount->buf_overrun = cnow.buf_overrun;
1847         icount->parity = cnow.parity;
1848         icount->rx = cnow.rx;
1849         icount->tx = cnow.tx;
1850         icount->cts = cnow.cts;
1851         icount->dsr = cnow.dsr;
1852         icount->rng = cnow.rng;
1853         icount->dcd = cnow.dcd;
1854         return 0;
1855 }
1856
1857 static void mxser_stoprx(struct tty_struct *tty)
1858 {
1859         struct mxser_port *info = tty->driver_data;
1860
1861         info->ldisc_stop_rx = 1;
1862         if (I_IXOFF(tty)) {
1863                 if (info->board->chip_flag) {
1864                         info->IER &= ~MOXA_MUST_RECV_ISR;
1865                         outb(info->IER, info->ioaddr + UART_IER);
1866                 } else {
1867                         info->x_char = STOP_CHAR(tty);
1868                         outb(0, info->ioaddr + UART_IER);
1869                         info->IER |= UART_IER_THRI;
1870                         outb(info->IER, info->ioaddr + UART_IER);
1871                 }
1872         }
1873
1874         if (C_CRTSCTS(tty)) {
1875                 info->MCR &= ~UART_MCR_RTS;
1876                 outb(info->MCR, info->ioaddr + UART_MCR);
1877         }
1878 }
1879
1880 /*
1881  * This routine is called by the upper-layer tty layer to signal that
1882  * incoming characters should be throttled.
1883  */
1884 static void mxser_throttle(struct tty_struct *tty)
1885 {
1886         mxser_stoprx(tty);
1887 }
1888
1889 static void mxser_unthrottle(struct tty_struct *tty)
1890 {
1891         struct mxser_port *info = tty->driver_data;
1892
1893         /* startrx */
1894         info->ldisc_stop_rx = 0;
1895         if (I_IXOFF(tty)) {
1896                 if (info->x_char)
1897                         info->x_char = 0;
1898                 else {
1899                         if (info->board->chip_flag) {
1900                                 info->IER |= MOXA_MUST_RECV_ISR;
1901                                 outb(info->IER, info->ioaddr + UART_IER);
1902                         } else {
1903                                 info->x_char = START_CHAR(tty);
1904                                 outb(0, info->ioaddr + UART_IER);
1905                                 info->IER |= UART_IER_THRI;
1906                                 outb(info->IER, info->ioaddr + UART_IER);
1907                         }
1908                 }
1909         }
1910
1911         if (C_CRTSCTS(tty)) {
1912                 info->MCR |= UART_MCR_RTS;
1913                 outb(info->MCR, info->ioaddr + UART_MCR);
1914         }
1915 }
1916
1917 /*
1918  * mxser_stop() and mxser_start()
1919  *
1920  * This routines are called before setting or resetting tty->stopped.
1921  * They enable or disable transmitter interrupts, as necessary.
1922  */
1923 static void mxser_stop(struct tty_struct *tty)
1924 {
1925         struct mxser_port *info = tty->driver_data;
1926         unsigned long flags;
1927
1928         spin_lock_irqsave(&info->slock, flags);
1929         if (info->IER & UART_IER_THRI) {
1930                 info->IER &= ~UART_IER_THRI;
1931                 outb(info->IER, info->ioaddr + UART_IER);
1932         }
1933         spin_unlock_irqrestore(&info->slock, flags);
1934 }
1935
1936 static void mxser_start(struct tty_struct *tty)
1937 {
1938         struct mxser_port *info = tty->driver_data;
1939         unsigned long flags;
1940
1941         spin_lock_irqsave(&info->slock, flags);
1942         if (info->xmit_cnt && info->port.xmit_buf) {
1943                 outb(info->IER & ~UART_IER_THRI, info->ioaddr + UART_IER);
1944                 info->IER |= UART_IER_THRI;
1945                 outb(info->IER, info->ioaddr + UART_IER);
1946         }
1947         spin_unlock_irqrestore(&info->slock, flags);
1948 }
1949
1950 static void mxser_set_termios(struct tty_struct *tty, struct ktermios *old_termios)
1951 {
1952         struct mxser_port *info = tty->driver_data;
1953         unsigned long flags;
1954
1955         spin_lock_irqsave(&info->slock, flags);
1956         mxser_change_speed(tty);
1957         spin_unlock_irqrestore(&info->slock, flags);
1958
1959         if ((old_termios->c_cflag & CRTSCTS) && !C_CRTSCTS(tty)) {
1960                 tty->hw_stopped = 0;
1961                 mxser_start(tty);
1962         }
1963
1964         /* Handle sw stopped */
1965         if ((old_termios->c_iflag & IXON) && !I_IXON(tty)) {
1966                 tty->stopped = 0;
1967
1968                 if (info->board->chip_flag) {
1969                         spin_lock_irqsave(&info->slock, flags);
1970                         mxser_disable_must_rx_software_flow_control(
1971                                         info->ioaddr);
1972                         spin_unlock_irqrestore(&info->slock, flags);
1973                 }
1974
1975                 mxser_start(tty);
1976         }
1977 }
1978
1979 /*
1980  * mxser_wait_until_sent() --- wait until the transmitter is empty
1981  */
1982 static void mxser_wait_until_sent(struct tty_struct *tty, int timeout)
1983 {
1984         struct mxser_port *info = tty->driver_data;
1985         unsigned long orig_jiffies, char_time;
1986         unsigned long flags;
1987         int lsr;
1988
1989         if (info->type == PORT_UNKNOWN)
1990                 return;
1991
1992         if (info->xmit_fifo_size == 0)
1993                 return;         /* Just in case.... */
1994
1995         orig_jiffies = jiffies;
1996         /*
1997          * Set the check interval to be 1/5 of the estimated time to
1998          * send a single character, and make it at least 1.  The check
1999          * interval should also be less than the timeout.
2000          *
2001          * Note: we have to use pretty tight timings here to satisfy
2002          * the NIST-PCTS.
2003          */
2004         char_time = (info->timeout - HZ / 50) / info->xmit_fifo_size;
2005         char_time = char_time / 5;
2006         if (char_time == 0)
2007                 char_time = 1;
2008         if (timeout && timeout < char_time)
2009                 char_time = timeout;
2010         /*
2011          * If the transmitter hasn't cleared in twice the approximate
2012          * amount of time to send the entire FIFO, it probably won't
2013          * ever clear.  This assumes the UART isn't doing flow
2014          * control, which is currently the case.  Hence, if it ever
2015          * takes longer than info->timeout, this is probably due to a
2016          * UART bug of some kind.  So, we clamp the timeout parameter at
2017          * 2*info->timeout.
2018          */
2019         if (!timeout || timeout > 2 * info->timeout)
2020                 timeout = 2 * info->timeout;
2021
2022         spin_lock_irqsave(&info->slock, flags);
2023         while (!((lsr = inb(info->ioaddr + UART_LSR)) & UART_LSR_TEMT)) {
2024                 spin_unlock_irqrestore(&info->slock, flags);
2025                 schedule_timeout_interruptible(char_time);
2026                 spin_lock_irqsave(&info->slock, flags);
2027                 if (signal_pending(current))
2028                         break;
2029                 if (timeout && time_after(jiffies, orig_jiffies + timeout))
2030                         break;
2031         }
2032         spin_unlock_irqrestore(&info->slock, flags);
2033         set_current_state(TASK_RUNNING);
2034 }
2035
2036 /*
2037  * This routine is called by tty_hangup() when a hangup is signaled.
2038  */
2039 static void mxser_hangup(struct tty_struct *tty)
2040 {
2041         struct mxser_port *info = tty->driver_data;
2042
2043         mxser_flush_buffer(tty);
2044         tty_port_hangup(&info->port);
2045 }
2046
2047 /*
2048  * mxser_rs_break() --- routine which turns the break handling on or off
2049  */
2050 static int mxser_rs_break(struct tty_struct *tty, int break_state)
2051 {
2052         struct mxser_port *info = tty->driver_data;
2053         unsigned long flags;
2054
2055         spin_lock_irqsave(&info->slock, flags);
2056         if (break_state == -1)
2057                 outb(inb(info->ioaddr + UART_LCR) | UART_LCR_SBC,
2058                         info->ioaddr + UART_LCR);
2059         else
2060                 outb(inb(info->ioaddr + UART_LCR) & ~UART_LCR_SBC,
2061                         info->ioaddr + UART_LCR);
2062         spin_unlock_irqrestore(&info->slock, flags);
2063         return 0;
2064 }
2065
2066 static void mxser_receive_chars(struct tty_struct *tty,
2067                                 struct mxser_port *port, int *status)
2068 {
2069         unsigned char ch, gdl;
2070         int ignored = 0;
2071         int cnt = 0;
2072         int recv_room;
2073         int max = 256;
2074
2075         recv_room = tty->receive_room;
2076         if (recv_room == 0 && !port->ldisc_stop_rx)
2077                 mxser_stoprx(tty);
2078         if (port->board->chip_flag != MOXA_OTHER_UART) {
2079
2080                 if (*status & UART_LSR_SPECIAL)
2081                         goto intr_old;
2082                 if (port->board->chip_flag == MOXA_MUST_MU860_HWID &&
2083                                 (*status & MOXA_MUST_LSR_RERR))
2084                         goto intr_old;
2085                 if (*status & MOXA_MUST_LSR_RERR)
2086                         goto intr_old;
2087
2088                 gdl = inb(port->ioaddr + MOXA_MUST_GDL_REGISTER);
2089
2090                 if (port->board->chip_flag == MOXA_MUST_MU150_HWID)
2091                         gdl &= MOXA_MUST_GDL_MASK;
2092                 if (gdl >= recv_room) {
2093                         if (!port->ldisc_stop_rx)
2094                                 mxser_stoprx(tty);
2095                 }
2096                 while (gdl--) {
2097                         ch = inb(port->ioaddr + UART_RX);
2098                         tty_insert_flip_char(&port->port, ch, 0);
2099                         cnt++;
2100                 }
2101                 goto end_intr;
2102         }
2103 intr_old:
2104
2105         do {
2106                 if (max-- < 0)
2107                         break;
2108
2109                 ch = inb(port->ioaddr + UART_RX);
2110                 if (port->board->chip_flag && (*status & UART_LSR_OE))
2111                         outb(0x23, port->ioaddr + UART_FCR);
2112                 *status &= port->read_status_mask;
2113                 if (*status & port->ignore_status_mask) {
2114                         if (++ignored > 100)
2115                                 break;
2116                 } else {
2117                         char flag = 0;
2118                         if (*status & UART_LSR_SPECIAL) {
2119                                 if (*status & UART_LSR_BI) {
2120                                         flag = TTY_BREAK;
2121                                         port->icount.brk++;
2122
2123                                         if (port->port.flags & ASYNC_SAK)
2124                                                 do_SAK(tty);
2125                                 } else if (*status & UART_LSR_PE) {
2126                                         flag = TTY_PARITY;
2127                                         port->icount.parity++;
2128                                 } else if (*status & UART_LSR_FE) {
2129                                         flag = TTY_FRAME;
2130                                         port->icount.frame++;
2131                                 } else if (*status & UART_LSR_OE) {
2132                                         flag = TTY_OVERRUN;
2133                                         port->icount.overrun++;
2134                                 } else
2135                                         flag = TTY_BREAK;
2136                         }
2137                         tty_insert_flip_char(&port->port, ch, flag);
2138                         cnt++;
2139                         if (cnt >= recv_room) {
2140                                 if (!port->ldisc_stop_rx)
2141                                         mxser_stoprx(tty);
2142                                 break;
2143                         }
2144
2145                 }
2146
2147                 if (port->board->chip_flag)
2148                         break;
2149
2150                 *status = inb(port->ioaddr + UART_LSR);
2151         } while (*status & UART_LSR_DR);
2152
2153 end_intr:
2154         mxvar_log.rxcnt[tty->index] += cnt;
2155         port->mon_data.rxcnt += cnt;
2156         port->mon_data.up_rxcnt += cnt;
2157
2158         tty_flip_buffer_push(&port->port);
2159 }
2160
2161 static void mxser_transmit_chars(struct tty_struct *tty, struct mxser_port *port)
2162 {
2163         int count, cnt;
2164
2165         if (port->x_char) {
2166                 outb(port->x_char, port->ioaddr + UART_TX);
2167                 port->x_char = 0;
2168                 mxvar_log.txcnt[tty->index]++;
2169                 port->mon_data.txcnt++;
2170                 port->mon_data.up_txcnt++;
2171                 port->icount.tx++;
2172                 return;
2173         }
2174
2175         if (port->port.xmit_buf == NULL)
2176                 return;
2177
2178         if (port->xmit_cnt <= 0 || tty->stopped ||
2179                         (tty->hw_stopped &&
2180                         (port->type != PORT_16550A) &&
2181                         (!port->board->chip_flag))) {
2182                 port->IER &= ~UART_IER_THRI;
2183                 outb(port->IER, port->ioaddr + UART_IER);
2184                 return;
2185         }
2186
2187         cnt = port->xmit_cnt;
2188         count = port->xmit_fifo_size;
2189         do {
2190                 outb(port->port.xmit_buf[port->xmit_tail++],
2191                         port->ioaddr + UART_TX);
2192                 port->xmit_tail = port->xmit_tail & (SERIAL_XMIT_SIZE - 1);
2193                 if (--port->xmit_cnt <= 0)
2194                         break;
2195         } while (--count > 0);
2196         mxvar_log.txcnt[tty->index] += (cnt - port->xmit_cnt);
2197
2198         port->mon_data.txcnt += (cnt - port->xmit_cnt);
2199         port->mon_data.up_txcnt += (cnt - port->xmit_cnt);
2200         port->icount.tx += (cnt - port->xmit_cnt);
2201
2202         if (port->xmit_cnt < WAKEUP_CHARS)
2203                 tty_wakeup(tty);
2204
2205         if (port->xmit_cnt <= 0) {
2206                 port->IER &= ~UART_IER_THRI;
2207                 outb(port->IER, port->ioaddr + UART_IER);
2208         }
2209 }
2210
2211 /*
2212  * This is the serial driver's generic interrupt routine
2213  */
2214 static irqreturn_t mxser_interrupt(int irq, void *dev_id)
2215 {
2216         int status, iir, i;
2217         struct mxser_board *brd = NULL;
2218         struct mxser_port *port;
2219         int max, irqbits, bits, msr;
2220         unsigned int int_cnt, pass_counter = 0;
2221         int handled = IRQ_NONE;
2222         struct tty_struct *tty;
2223
2224         for (i = 0; i < MXSER_BOARDS; i++)
2225                 if (dev_id == &mxser_boards[i]) {
2226                         brd = dev_id;
2227                         break;
2228                 }
2229
2230         if (i == MXSER_BOARDS)
2231                 goto irq_stop;
2232         if (brd == NULL)
2233                 goto irq_stop;
2234         max = brd->info->nports;
2235         while (pass_counter++ < MXSER_ISR_PASS_LIMIT) {
2236                 irqbits = inb(brd->vector) & brd->vector_mask;
2237                 if (irqbits == brd->vector_mask)
2238                         break;
2239
2240                 handled = IRQ_HANDLED;
2241                 for (i = 0, bits = 1; i < max; i++, irqbits |= bits, bits <<= 1) {
2242                         if (irqbits == brd->vector_mask)
2243                                 break;
2244                         if (bits & irqbits)
2245                                 continue;
2246                         port = &brd->ports[i];
2247
2248                         int_cnt = 0;
2249                         spin_lock(&port->slock);
2250                         do {
2251                                 iir = inb(port->ioaddr + UART_IIR);
2252                                 if (iir & UART_IIR_NO_INT)
2253                                         break;
2254                                 iir &= MOXA_MUST_IIR_MASK;
2255                                 tty = tty_port_tty_get(&port->port);
2256                                 if (!tty || port->closing ||
2257                                     !tty_port_initialized(&port->port)) {
2258                                         status = inb(port->ioaddr + UART_LSR);
2259                                         outb(0x27, port->ioaddr + UART_FCR);
2260                                         inb(port->ioaddr + UART_MSR);
2261                                         tty_kref_put(tty);
2262                                         break;
2263                                 }
2264
2265                                 status = inb(port->ioaddr + UART_LSR);
2266
2267                                 if (status & UART_LSR_PE)
2268                                         port->err_shadow |= NPPI_NOTIFY_PARITY;
2269                                 if (status & UART_LSR_FE)
2270                                         port->err_shadow |= NPPI_NOTIFY_FRAMING;
2271                                 if (status & UART_LSR_OE)
2272                                         port->err_shadow |=
2273                                                 NPPI_NOTIFY_HW_OVERRUN;
2274                                 if (status & UART_LSR_BI)
2275                                         port->err_shadow |= NPPI_NOTIFY_BREAK;
2276
2277                                 if (port->board->chip_flag) {
2278                                         if (iir == MOXA_MUST_IIR_GDA ||
2279                                             iir == MOXA_MUST_IIR_RDA ||
2280                                             iir == MOXA_MUST_IIR_RTO ||
2281                                             iir == MOXA_MUST_IIR_LSR)
2282                                                 mxser_receive_chars(tty, port,
2283                                                                 &status);
2284
2285                                 } else {
2286                                         status &= port->read_status_mask;
2287                                         if (status & UART_LSR_DR)
2288                                                 mxser_receive_chars(tty, port,
2289                                                                 &status);
2290                                 }
2291                                 msr = inb(port->ioaddr + UART_MSR);
2292                                 if (msr & UART_MSR_ANY_DELTA)
2293                                         mxser_check_modem_status(tty, port, msr);
2294
2295                                 if (port->board->chip_flag) {
2296                                         if (iir == 0x02 && (status &
2297                                                                 UART_LSR_THRE))
2298                                                 mxser_transmit_chars(tty, port);
2299                                 } else {
2300                                         if (status & UART_LSR_THRE)
2301                                                 mxser_transmit_chars(tty, port);
2302                                 }
2303                                 tty_kref_put(tty);
2304                         } while (int_cnt++ < MXSER_ISR_PASS_LIMIT);
2305                         spin_unlock(&port->slock);
2306                 }
2307         }
2308
2309 irq_stop:
2310         return handled;
2311 }
2312
2313 static const struct tty_operations mxser_ops = {
2314         .open = mxser_open,
2315         .close = mxser_close,
2316         .write = mxser_write,
2317         .put_char = mxser_put_char,
2318         .flush_chars = mxser_flush_chars,
2319         .write_room = mxser_write_room,
2320         .chars_in_buffer = mxser_chars_in_buffer,
2321         .flush_buffer = mxser_flush_buffer,
2322         .ioctl = mxser_ioctl,
2323         .throttle = mxser_throttle,
2324         .unthrottle = mxser_unthrottle,
2325         .set_termios = mxser_set_termios,
2326         .stop = mxser_stop,
2327         .start = mxser_start,
2328         .hangup = mxser_hangup,
2329         .break_ctl = mxser_rs_break,
2330         .wait_until_sent = mxser_wait_until_sent,
2331         .tiocmget = mxser_tiocmget,
2332         .tiocmset = mxser_tiocmset,
2333         .set_serial = mxser_set_serial_info,
2334         .get_serial = mxser_get_serial_info,
2335         .get_icount = mxser_get_icount,
2336 };
2337
2338 static const struct tty_port_operations mxser_port_ops = {
2339         .carrier_raised = mxser_carrier_raised,
2340         .dtr_rts = mxser_dtr_rts,
2341         .activate = mxser_activate,
2342         .shutdown = mxser_shutdown_port,
2343 };
2344
2345 /*
2346  * The MOXA Smartio/Industio serial driver boot-time initialization code!
2347  */
2348
2349 static bool allow_overlapping_vector;
2350 module_param(allow_overlapping_vector, bool, S_IRUGO);
2351 MODULE_PARM_DESC(allow_overlapping_vector, "whether we allow ISA cards to be configured such that vector overlabs IO ports (default=no)");
2352
2353 static bool mxser_overlapping_vector(struct mxser_board *brd)
2354 {
2355         return allow_overlapping_vector &&
2356                 brd->vector >= brd->ports[0].ioaddr &&
2357                 brd->vector < brd->ports[0].ioaddr + 8 * brd->info->nports;
2358 }
2359
2360 static int mxser_request_vector(struct mxser_board *brd)
2361 {
2362         if (mxser_overlapping_vector(brd))
2363                 return 0;
2364         return request_region(brd->vector, 1, "mxser(vector)") ? 0 : -EIO;
2365 }
2366
2367 static void mxser_release_vector(struct mxser_board *brd)
2368 {
2369         if (mxser_overlapping_vector(brd))
2370                 return;
2371         release_region(brd->vector, 1);
2372 }
2373
2374 static void mxser_release_ISA_res(struct mxser_board *brd)
2375 {
2376         release_region(brd->ports[0].ioaddr, 8 * brd->info->nports);
2377         mxser_release_vector(brd);
2378 }
2379
2380 static int mxser_initbrd(struct mxser_board *brd)
2381 {
2382         struct mxser_port *info;
2383         unsigned int i;
2384         int retval;
2385
2386         printk(KERN_INFO "mxser: max. baud rate = %d bps\n",
2387                         brd->ports[0].max_baud);
2388
2389         for (i = 0; i < brd->info->nports; i++) {
2390                 info = &brd->ports[i];
2391                 tty_port_init(&info->port);
2392                 info->port.ops = &mxser_port_ops;
2393                 info->board = brd;
2394                 info->stop_rx = 0;
2395                 info->ldisc_stop_rx = 0;
2396
2397                 /* Enhance mode enabled here */
2398                 if (brd->chip_flag != MOXA_OTHER_UART)
2399                         mxser_enable_must_enchance_mode(info->ioaddr);
2400
2401                 info->type = brd->uart_type;
2402
2403                 process_txrx_fifo(info);
2404
2405                 info->custom_divisor = info->baud_base * 16;
2406                 info->port.close_delay = 5 * HZ / 10;
2407                 info->port.closing_wait = 30 * HZ;
2408                 info->normal_termios = mxvar_sdriver->init_termios;
2409                 memset(&info->mon_data, 0, sizeof(struct mxser_mon));
2410                 info->err_shadow = 0;
2411                 spin_lock_init(&info->slock);
2412
2413                 /* before set INT ISR, disable all int */
2414                 outb(inb(info->ioaddr + UART_IER) & 0xf0,
2415                         info->ioaddr + UART_IER);
2416         }
2417
2418         retval = request_irq(brd->irq, mxser_interrupt, IRQF_SHARED, "mxser",
2419                         brd);
2420         if (retval) {
2421                 for (i = 0; i < brd->info->nports; i++)
2422                         tty_port_destroy(&brd->ports[i].port);
2423                 printk(KERN_ERR "Board %s: Request irq failed, IRQ (%d) may "
2424                         "conflict with another device.\n",
2425                         brd->info->name, brd->irq);
2426         }
2427
2428         return retval;
2429 }
2430
2431 static void mxser_board_remove(struct mxser_board *brd)
2432 {
2433         unsigned int i;
2434
2435         for (i = 0; i < brd->info->nports; i++) {
2436                 tty_unregister_device(mxvar_sdriver, brd->idx + i);
2437                 tty_port_destroy(&brd->ports[i].port);
2438         }
2439         free_irq(brd->irq, brd);
2440 }
2441
2442 static int __init mxser_get_ISA_conf(int cap, struct mxser_board *brd)
2443 {
2444         int id, i, bits, ret;
2445         unsigned short regs[16], irq;
2446         unsigned char scratch, scratch2;
2447
2448         brd->chip_flag = MOXA_OTHER_UART;
2449
2450         id = mxser_read_register(cap, regs);
2451         switch (id) {
2452         case C168_ASIC_ID:
2453                 brd->info = &mxser_cards[0];
2454                 break;
2455         case C104_ASIC_ID:
2456                 brd->info = &mxser_cards[1];
2457                 break;
2458         case CI104J_ASIC_ID:
2459                 brd->info = &mxser_cards[2];
2460                 break;
2461         case C102_ASIC_ID:
2462                 brd->info = &mxser_cards[5];
2463                 break;
2464         case CI132_ASIC_ID:
2465                 brd->info = &mxser_cards[6];
2466                 break;
2467         case CI134_ASIC_ID:
2468                 brd->info = &mxser_cards[7];
2469                 break;
2470         default:
2471                 return 0;
2472         }
2473
2474         irq = 0;
2475         /* some ISA cards have 2 ports, but we want to see them as 4-port (why?)
2476            Flag-hack checks if configuration should be read as 2-port here. */
2477         if (brd->info->nports == 2 || (brd->info->flags & MXSER_HAS2)) {
2478                 irq = regs[9] & 0xF000;
2479                 irq = irq | (irq >> 4);
2480                 if (irq != (regs[9] & 0xFF00))
2481                         goto err_irqconflict;
2482         } else if (brd->info->nports == 4) {
2483                 irq = regs[9] & 0xF000;
2484                 irq = irq | (irq >> 4);
2485                 irq = irq | (irq >> 8);
2486                 if (irq != regs[9])
2487                         goto err_irqconflict;
2488         } else if (brd->info->nports == 8) {
2489                 irq = regs[9] & 0xF000;
2490                 irq = irq | (irq >> 4);
2491                 irq = irq | (irq >> 8);
2492                 if ((irq != regs[9]) || (irq != regs[10]))
2493                         goto err_irqconflict;
2494         }
2495
2496         if (!irq) {
2497                 printk(KERN_ERR "mxser: interrupt number unset\n");
2498                 return -EIO;
2499         }
2500         brd->irq = ((int)(irq & 0xF000) >> 12);
2501         for (i = 0; i < 8; i++)
2502                 brd->ports[i].ioaddr = (int) regs[i + 1] & 0xFFF8;
2503         if ((regs[12] & 0x80) == 0) {
2504                 printk(KERN_ERR "mxser: invalid interrupt vector\n");
2505                 return -EIO;
2506         }
2507         brd->vector = (int)regs[11];    /* interrupt vector */
2508         if (id == 1)
2509                 brd->vector_mask = 0x00FF;
2510         else
2511                 brd->vector_mask = 0x000F;
2512         for (i = 7, bits = 0x0100; i >= 0; i--, bits <<= 1) {
2513                 if (regs[12] & bits) {
2514                         brd->ports[i].baud_base = 921600;
2515                         brd->ports[i].max_baud = 921600;
2516                 } else {
2517                         brd->ports[i].baud_base = 115200;
2518                         brd->ports[i].max_baud = 115200;
2519                 }
2520         }
2521         scratch2 = inb(cap + UART_LCR) & (~UART_LCR_DLAB);
2522         outb(scratch2 | UART_LCR_DLAB, cap + UART_LCR);
2523         outb(0, cap + UART_EFR);        /* EFR is the same as FCR */
2524         outb(scratch2, cap + UART_LCR);
2525         outb(UART_FCR_ENABLE_FIFO, cap + UART_FCR);
2526         scratch = inb(cap + UART_IIR);
2527
2528         if (scratch & 0xC0)
2529                 brd->uart_type = PORT_16550A;
2530         else
2531                 brd->uart_type = PORT_16450;
2532         if (!request_region(brd->ports[0].ioaddr, 8 * brd->info->nports,
2533                         "mxser(IO)")) {
2534                 printk(KERN_ERR "mxser: can't request ports I/O region: "
2535                                 "0x%.8lx-0x%.8lx\n",
2536                                 brd->ports[0].ioaddr, brd->ports[0].ioaddr +
2537                                 8 * brd->info->nports - 1);
2538                 return -EIO;
2539         }
2540
2541         ret = mxser_request_vector(brd);
2542         if (ret) {
2543                 release_region(brd->ports[0].ioaddr, 8 * brd->info->nports);
2544                 printk(KERN_ERR "mxser: can't request interrupt vector region: "
2545                                 "0x%.8lx-0x%.8lx\n",
2546                                 brd->ports[0].ioaddr, brd->ports[0].ioaddr +
2547                                 8 * brd->info->nports - 1);
2548                 return ret;
2549         }
2550         return brd->info->nports;
2551
2552 err_irqconflict:
2553         printk(KERN_ERR "mxser: invalid interrupt number\n");
2554         return -EIO;
2555 }
2556
2557 static int mxser_probe(struct pci_dev *pdev,
2558                 const struct pci_device_id *ent)
2559 {
2560 #ifdef CONFIG_PCI
2561         struct mxser_board *brd;
2562         unsigned int i, j;
2563         unsigned long ioaddress;
2564         struct device *tty_dev;
2565         int retval = -EINVAL;
2566
2567         for (i = 0; i < MXSER_BOARDS; i++)
2568                 if (mxser_boards[i].info == NULL)
2569                         break;
2570
2571         if (i >= MXSER_BOARDS) {
2572                 dev_err(&pdev->dev, "too many boards found (maximum %d), board "
2573                                 "not configured\n", MXSER_BOARDS);
2574                 goto err;
2575         }
2576
2577         brd = &mxser_boards[i];
2578         brd->idx = i * MXSER_PORTS_PER_BOARD;
2579         dev_info(&pdev->dev, "found MOXA %s board (BusNo=%d, DevNo=%d)\n",
2580                 mxser_cards[ent->driver_data].name,
2581                 pdev->bus->number, PCI_SLOT(pdev->devfn));
2582
2583         retval = pci_enable_device(pdev);
2584         if (retval) {
2585                 dev_err(&pdev->dev, "PCI enable failed\n");
2586                 goto err;
2587         }
2588
2589         /* io address */
2590         ioaddress = pci_resource_start(pdev, 2);
2591         retval = pci_request_region(pdev, 2, "mxser(IO)");
2592         if (retval)
2593                 goto err_dis;
2594
2595         brd->info = &mxser_cards[ent->driver_data];
2596         for (i = 0; i < brd->info->nports; i++)
2597                 brd->ports[i].ioaddr = ioaddress + 8 * i;
2598
2599         /* vector */
2600         ioaddress = pci_resource_start(pdev, 3);
2601         retval = pci_request_region(pdev, 3, "mxser(vector)");
2602         if (retval)
2603                 goto err_zero;
2604         brd->vector = ioaddress;
2605
2606         /* irq */
2607         brd->irq = pdev->irq;
2608
2609         brd->chip_flag = CheckIsMoxaMust(brd->ports[0].ioaddr);
2610         brd->uart_type = PORT_16550A;
2611         brd->vector_mask = 0;
2612
2613         for (i = 0; i < brd->info->nports; i++) {
2614                 for (j = 0; j < UART_INFO_NUM; j++) {
2615                         if (Gpci_uart_info[j].type == brd->chip_flag) {
2616                                 brd->ports[i].max_baud =
2617                                         Gpci_uart_info[j].max_baud;
2618
2619                                 /* exception....CP-102 */
2620                                 if (brd->info->flags & MXSER_HIGHBAUD)
2621                                         brd->ports[i].max_baud = 921600;
2622                                 break;
2623                         }
2624                 }
2625         }
2626
2627         if (brd->chip_flag == MOXA_MUST_MU860_HWID) {
2628                 for (i = 0; i < brd->info->nports; i++) {
2629                         if (i < 4)
2630                                 brd->ports[i].opmode_ioaddr = ioaddress + 4;
2631                         else
2632                                 brd->ports[i].opmode_ioaddr = ioaddress + 0x0c;
2633                 }
2634                 outb(0, ioaddress + 4); /* default set to RS232 mode */
2635                 outb(0, ioaddress + 0x0c);      /* default set to RS232 mode */
2636         }
2637
2638         for (i = 0; i < brd->info->nports; i++) {
2639                 brd->vector_mask |= (1 << i);
2640                 brd->ports[i].baud_base = 921600;
2641         }
2642
2643         /* mxser_initbrd will hook ISR. */
2644         retval = mxser_initbrd(brd);
2645         if (retval)
2646                 goto err_rel3;
2647
2648         for (i = 0; i < brd->info->nports; i++) {
2649                 tty_dev = tty_port_register_device(&brd->ports[i].port,
2650                                 mxvar_sdriver, brd->idx + i, &pdev->dev);
2651                 if (IS_ERR(tty_dev)) {
2652                         retval = PTR_ERR(tty_dev);
2653                         for (; i > 0; i--)
2654                                 tty_unregister_device(mxvar_sdriver,
2655                                         brd->idx + i - 1);
2656                         goto err_relbrd;
2657                 }
2658         }
2659
2660         pci_set_drvdata(pdev, brd);
2661
2662         return 0;
2663 err_relbrd:
2664         for (i = 0; i < brd->info->nports; i++)
2665                 tty_port_destroy(&brd->ports[i].port);
2666         free_irq(brd->irq, brd);
2667 err_rel3:
2668         pci_release_region(pdev, 3);
2669 err_zero:
2670         brd->info = NULL;
2671         pci_release_region(pdev, 2);
2672 err_dis:
2673         pci_disable_device(pdev);
2674 err:
2675         return retval;
2676 #else
2677         return -ENODEV;
2678 #endif
2679 }
2680
2681 static void mxser_remove(struct pci_dev *pdev)
2682 {
2683 #ifdef CONFIG_PCI
2684         struct mxser_board *brd = pci_get_drvdata(pdev);
2685
2686         mxser_board_remove(brd);
2687
2688         pci_release_region(pdev, 2);
2689         pci_release_region(pdev, 3);
2690         pci_disable_device(pdev);
2691         brd->info = NULL;
2692 #endif
2693 }
2694
2695 static struct pci_driver mxser_driver = {
2696         .name = "mxser",
2697         .id_table = mxser_pcibrds,
2698         .probe = mxser_probe,
2699         .remove = mxser_remove
2700 };
2701
2702 static int __init mxser_module_init(void)
2703 {
2704         struct mxser_board *brd;
2705         struct device *tty_dev;
2706         unsigned int b, i, m;
2707         int retval;
2708
2709         mxvar_sdriver = alloc_tty_driver(MXSER_PORTS + 1);
2710         if (!mxvar_sdriver)
2711                 return -ENOMEM;
2712
2713         printk(KERN_INFO "MOXA Smartio/Industio family driver version %s\n",
2714                 MXSER_VERSION);
2715
2716         /* Initialize the tty_driver structure */
2717         mxvar_sdriver->name = "ttyMI";
2718         mxvar_sdriver->major = ttymajor;
2719         mxvar_sdriver->minor_start = 0;
2720         mxvar_sdriver->type = TTY_DRIVER_TYPE_SERIAL;
2721         mxvar_sdriver->subtype = SERIAL_TYPE_NORMAL;
2722         mxvar_sdriver->init_termios = tty_std_termios;
2723         mxvar_sdriver->init_termios.c_cflag = B9600|CS8|CREAD|HUPCL|CLOCAL;
2724         mxvar_sdriver->flags = TTY_DRIVER_REAL_RAW|TTY_DRIVER_DYNAMIC_DEV;
2725         tty_set_operations(mxvar_sdriver, &mxser_ops);
2726
2727         retval = tty_register_driver(mxvar_sdriver);
2728         if (retval) {
2729                 printk(KERN_ERR "Couldn't install MOXA Smartio/Industio family "
2730                                 "tty driver !\n");
2731                 goto err_put;
2732         }
2733
2734         /* Start finding ISA boards here */
2735         for (m = 0, b = 0; b < MXSER_BOARDS; b++) {
2736                 if (!ioaddr[b])
2737                         continue;
2738
2739                 brd = &mxser_boards[m];
2740                 retval = mxser_get_ISA_conf(ioaddr[b], brd);
2741                 if (retval <= 0) {
2742                         brd->info = NULL;
2743                         continue;
2744                 }
2745
2746                 printk(KERN_INFO "mxser: found MOXA %s board (CAP=0x%lx)\n",
2747                                 brd->info->name, ioaddr[b]);
2748
2749                 /* mxser_initbrd will hook ISR. */
2750                 if (mxser_initbrd(brd) < 0) {
2751                         mxser_release_ISA_res(brd);
2752                         brd->info = NULL;
2753                         continue;
2754                 }
2755
2756                 brd->idx = m * MXSER_PORTS_PER_BOARD;
2757                 for (i = 0; i < brd->info->nports; i++) {
2758                         tty_dev = tty_port_register_device(&brd->ports[i].port,
2759                                         mxvar_sdriver, brd->idx + i, NULL);
2760                         if (IS_ERR(tty_dev)) {
2761                                 for (; i > 0; i--)
2762                                         tty_unregister_device(mxvar_sdriver,
2763                                                 brd->idx + i - 1);
2764                                 for (i = 0; i < brd->info->nports; i++)
2765                                         tty_port_destroy(&brd->ports[i].port);
2766                                 free_irq(brd->irq, brd);
2767                                 mxser_release_ISA_res(brd);
2768                                 brd->info = NULL;
2769                                 break;
2770                         }
2771                 }
2772                 if (brd->info == NULL)
2773                         continue;
2774
2775                 m++;
2776         }
2777
2778         retval = pci_register_driver(&mxser_driver);
2779         if (retval) {
2780                 printk(KERN_ERR "mxser: can't register pci driver\n");
2781                 if (!m) {
2782                         retval = -ENODEV;
2783                         goto err_unr;
2784                 } /* else: we have some ISA cards under control */
2785         }
2786
2787         return 0;
2788 err_unr:
2789         tty_unregister_driver(mxvar_sdriver);
2790 err_put:
2791         put_tty_driver(mxvar_sdriver);
2792         return retval;
2793 }
2794
2795 static void __exit mxser_module_exit(void)
2796 {
2797         unsigned int i;
2798
2799         pci_unregister_driver(&mxser_driver);
2800
2801         for (i = 0; i < MXSER_BOARDS; i++) /* ISA remains */
2802                 if (mxser_boards[i].info != NULL)
2803                         mxser_board_remove(&mxser_boards[i]);
2804         tty_unregister_driver(mxvar_sdriver);
2805         put_tty_driver(mxvar_sdriver);
2806
2807         for (i = 0; i < MXSER_BOARDS; i++)
2808                 if (mxser_boards[i].info != NULL)
2809                         mxser_release_ISA_res(&mxser_boards[i]);
2810 }
2811
2812 module_init(mxser_module_init);
2813 module_exit(mxser_module_exit);