drivers/tty/mxser.c

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