drivers/tty/mxser.c

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