drivers/tty/nozomi.c

   1 /*
   2  * nozomi.c  -- HSDPA driver Broadband Wireless Data Card - Globe Trotter
   3  *
   4  * Written by: Ulf Jakobsson,
   5  *             Jan Åkerfeldt,
   6  *             Stefan Thomasson,
   7  *
   8  * Maintained by: Paul Hardwick (p.hardwick@option.com)
   9  *
  10  * Patches:
  11  *          Locking code changes for Vodafone by Sphere Systems Ltd,
  12  *                              Andrew Bird (ajb@spheresystems.co.uk )
  13  *                              & Phil Sanderson
  14  *
  15  * Source has been ported from an implementation made by Filip Aben @ Option
  16  *
  17  * --------------------------------------------------------------------------
  18  *
  19  * Copyright (c) 2005,2006 Option Wireless Sweden AB
  20  * Copyright (c) 2006 Sphere Systems Ltd
  21  * Copyright (c) 2006 Option Wireless n/v
  22  * All rights Reserved.
  23  *
  24  * This program is free software; you can redistribute it and/or modify
  25  * it under the terms of the GNU General Public License as published by
  26  * the Free Software Foundation; either version 2 of the License, or
  27  * (at your option) any later version.
  28  *
  29  * This program is distributed in the hope that it will be useful,
  30  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  31  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  32  * GNU General Public License for more details.
  33  *
  34  * You should have received a copy of the GNU General Public License
  35  * along with this program; if not, write to the Free Software
  36  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
  37  *
  38  * --------------------------------------------------------------------------
  39  */
  40
  41 /* Enable this to have a lot of debug printouts */
  42 #define DEBUG
  43
  44 #include <linux/kernel.h>
  45 #include <linux/module.h>
  46 #include <linux/pci.h>
  47 #include <linux/ioport.h>
  48 #include <linux/tty.h>
  49 #include <linux/tty_driver.h>
  50 #include <linux/tty_flip.h>
  51 #include <linux/sched.h>
  52 #include <linux/serial.h>
  53 #include <linux/interrupt.h>
  54 #include <linux/kmod.h>
  55 #include <linux/init.h>
  56 #include <linux/kfifo.h>
  57 #include <linux/uaccess.h>
  58 #include <linux/slab.h>
  59 #include <asm/byteorder.h>
  60
  61 #include <linux/delay.h>
  62
  63
  64 #define VERSION_STRING DRIVER_DESC " 2.1d"
  65
  66 /*    Macros definitions */
  67
  68 /* Default debug printout level */
  69 #define NOZOMI_DEBUG_LEVEL 0x00
  70
  71 #define P_BUF_SIZE 128
  72 #define NFO(_err_flag_, args...)                                \
  73 do {                                                            \
  74         char tmp[P_BUF_SIZE];                                   \
  75         snprintf(tmp, sizeof(tmp), ##args);                     \
  76         printk(_err_flag_ "[%d] %s(): %s\n", __LINE__,          \
  77                 __func__, tmp);                         \
  78 } while (0)
  79
  80 #define DBG1(args...) D_(0x01, ##args)
  81 #define DBG2(args...) D_(0x02, ##args)
  82 #define DBG3(args...) D_(0x04, ##args)
  83 #define DBG4(args...) D_(0x08, ##args)
  84 #define DBG5(args...) D_(0x10, ##args)
  85 #define DBG6(args...) D_(0x20, ##args)
  86 #define DBG7(args...) D_(0x40, ##args)
  87 #define DBG8(args...) D_(0x80, ##args)
  88
  89 #ifdef DEBUG
  90 /* Do we need this settable at runtime? */
  91 static int debug = NOZOMI_DEBUG_LEVEL;
  92
  93 #define D(lvl, args...)  do \
  94                         {if (lvl & debug) NFO(KERN_DEBUG, ##args); } \
  95                         while (0)
  96 #define D_(lvl, args...) D(lvl, ##args)
  97
  98 /* These printouts are always printed */
  99
 100 #else
 101 static int debug;
 102 #define D_(lvl, args...)
 103 #endif
 104
 105 /* TODO: rewrite to optimize macros... */
 106
 107 #define TMP_BUF_MAX 256
 108
 109 #define DUMP(buf__,len__) \
 110   do {  \
 111     char tbuf[TMP_BUF_MAX] = {0};\
 112     if (len__ > 1) {\
 113         snprintf(tbuf, len__ > TMP_BUF_MAX ? TMP_BUF_MAX : len__, "%s", buf__);\
 114         if (tbuf[len__-2] == '\r') {\
 115                 tbuf[len__-2] = 'r';\
 116         } \
 117         DBG1("SENDING: '%s' (%d+n)", tbuf, len__);\
 118     } else {\
 119         DBG1("SENDING: '%s' (%d)", tbuf, len__);\
 120     } \
 121 } while (0)
 122
 123 /*    Defines */
 124 #define NOZOMI_NAME             "nozomi"
 125 #define NOZOMI_NAME_TTY         "nozomi_tty"
 126 #define DRIVER_DESC             "Nozomi driver"
 127
 128 #define NTTY_TTY_MAXMINORS      256
 129 #define NTTY_FIFO_BUFFER_SIZE   8192
 130
 131 /* Must be power of 2 */
 132 #define FIFO_BUFFER_SIZE_UL     8192
 133
 134 /* Size of tmp send buffer to card */
 135 #define SEND_BUF_MAX            1024
 136 #define RECEIVE_BUF_MAX         4
 137
 138
 139 #define R_IIR           0x0000  /* Interrupt Identity Register */
 140 #define R_FCR           0x0000  /* Flow Control Register */
 141 #define R_IER           0x0004  /* Interrupt Enable Register */
 142
 143 #define CONFIG_MAGIC    0xEFEFFEFE
 144 #define TOGGLE_VALID    0x0000
 145
 146 /* Definition of interrupt tokens */
 147 #define MDM_DL1         0x0001
 148 #define MDM_UL1         0x0002
 149 #define MDM_DL2         0x0004
 150 #define MDM_UL2         0x0008
 151 #define DIAG_DL1        0x0010
 152 #define DIAG_DL2        0x0020
 153 #define DIAG_UL         0x0040
 154 #define APP1_DL         0x0080
 155 #define APP1_UL         0x0100
 156 #define APP2_DL         0x0200
 157 #define APP2_UL         0x0400
 158 #define CTRL_DL         0x0800
 159 #define CTRL_UL         0x1000
 160 #define RESET           0x8000
 161
 162 #define MDM_DL          (MDM_DL1  | MDM_DL2)
 163 #define MDM_UL          (MDM_UL1  | MDM_UL2)
 164 #define DIAG_DL         (DIAG_DL1 | DIAG_DL2)
 165
 166 /* modem signal definition */
 167 #define CTRL_DSR        0x0001
 168 #define CTRL_DCD        0x0002
 169 #define CTRL_RI         0x0004
 170 #define CTRL_CTS        0x0008
 171
 172 #define CTRL_DTR        0x0001
 173 #define CTRL_RTS        0x0002
 174
 175 #define MAX_PORT                4
 176 #define NOZOMI_MAX_PORTS        5
 177 #define NOZOMI_MAX_CARDS        (NTTY_TTY_MAXMINORS / MAX_PORT)
 178
 179 /*    Type definitions */
 180
 181 /*
 182  * There are two types of nozomi cards,
 183  * one with 2048 memory and with 8192 memory
 184  */
 185 enum card_type {
 186         F32_2 = 2048,   /* 512 bytes downlink + uplink * 2 -> 2048 */
 187         F32_8 = 8192,   /* 3072 bytes downl. + 1024 bytes uplink * 2 -> 8192 */
 188 };
 189
 190 /* Initialization states a card can be in */
 191 enum card_state {
 192         NOZOMI_STATE_UKNOWN     = 0,
 193         NOZOMI_STATE_ENABLED    = 1,    /* pci device enabled */
 194         NOZOMI_STATE_ALLOCATED  = 2,    /* config setup done */
 195         NOZOMI_STATE_READY      = 3,    /* flowcontrols received */
 196 };
 197
 198 /* Two different toggle channels exist */
 199 enum channel_type {
 200         CH_A = 0,
 201         CH_B = 1,
 202 };
 203
 204 /* Port definition for the card regarding flow control */
 205 enum ctrl_port_type {
 206         CTRL_CMD        = 0,
 207         CTRL_MDM        = 1,
 208         CTRL_DIAG       = 2,
 209         CTRL_APP1       = 3,
 210         CTRL_APP2       = 4,
 211         CTRL_ERROR      = -1,
 212 };
 213
 214 /* Ports that the nozomi has */
 215 enum port_type {
 216         PORT_MDM        = 0,
 217         PORT_DIAG       = 1,
 218         PORT_APP1       = 2,
 219         PORT_APP2       = 3,
 220         PORT_CTRL       = 4,
 221         PORT_ERROR      = -1,
 222 };
 223
 224 #ifdef __BIG_ENDIAN
 225 /* Big endian */
 226
 227 struct toggles {
 228         unsigned int enabled:5; /*
 229                                  * Toggle fields are valid if enabled is 0,
 230                                  * else A-channels must always be used.
 231                                  */
 232         unsigned int diag_dl:1;
 233         unsigned int mdm_dl:1;
 234         unsigned int mdm_ul:1;
 235 } __attribute__ ((packed));
 236
 237 /* Configuration table to read at startup of card */
 238 /* Is for now only needed during initialization phase */
 239 struct config_table {
 240         u32 signature;
 241         u16 product_information;
 242         u16 version;
 243         u8 pad3[3];
 244         struct toggles toggle;
 245         u8 pad1[4];
 246         u16 dl_mdm_len1;        /*
 247                                  * If this is 64, it can hold
 248                                  * 60 bytes + 4 that is length field
 249                                  */
 250         u16 dl_start;
 251
 252         u16 dl_diag_len1;
 253         u16 dl_mdm_len2;        /*
 254                                  * If this is 64, it can hold
 255                                  * 60 bytes + 4 that is length field
 256                                  */
 257         u16 dl_app1_len;
 258
 259         u16 dl_diag_len2;
 260         u16 dl_ctrl_len;
 261         u16 dl_app2_len;
 262         u8 pad2[16];
 263         u16 ul_mdm_len1;
 264         u16 ul_start;
 265         u16 ul_diag_len;
 266         u16 ul_mdm_len2;
 267         u16 ul_app1_len;
 268         u16 ul_app2_len;
 269         u16 ul_ctrl_len;
 270 } __attribute__ ((packed));
 271
 272 /* This stores all control downlink flags */
 273 struct ctrl_dl {
 274         u8 port;
 275         unsigned int reserved:4;
 276         unsigned int CTS:1;
 277         unsigned int RI:1;
 278         unsigned int DCD:1;
 279         unsigned int DSR:1;
 280 } __attribute__ ((packed));
 281
 282 /* This stores all control uplink flags */
 283 struct ctrl_ul {
 284         u8 port;
 285         unsigned int reserved:6;
 286         unsigned int RTS:1;
 287         unsigned int DTR:1;
 288 } __attribute__ ((packed));
 289
 290 #else
 291 /* Little endian */
 292
 293 /* This represents the toggle information */
 294 struct toggles {
 295         unsigned int mdm_ul:1;
 296         unsigned int mdm_dl:1;
 297         unsigned int diag_dl:1;
 298         unsigned int enabled:5; /*
 299                                  * Toggle fields are valid if enabled is 0,
 300                                  * else A-channels must always be used.
 301                                  */
 302 } __attribute__ ((packed));
 303
 304 /* Configuration table to read at startup of card */
 305 struct config_table {
 306         u32 signature;
 307         u16 version;
 308         u16 product_information;
 309         struct toggles toggle;
 310         u8 pad1[7];
 311         u16 dl_start;
 312         u16 dl_mdm_len1;        /*
 313                                  * If this is 64, it can hold
 314                                  * 60 bytes + 4 that is length field
 315                                  */
 316         u16 dl_mdm_len2;
 317         u16 dl_diag_len1;
 318         u16 dl_diag_len2;
 319         u16 dl_app1_len;
 320         u16 dl_app2_len;
 321         u16 dl_ctrl_len;
 322         u8 pad2[16];
 323         u16 ul_start;
 324         u16 ul_mdm_len2;
 325         u16 ul_mdm_len1;
 326         u16 ul_diag_len;
 327         u16 ul_app1_len;
 328         u16 ul_app2_len;
 329         u16 ul_ctrl_len;
 330 } __attribute__ ((packed));
 331
 332 /* This stores all control downlink flags */
 333 struct ctrl_dl {
 334         unsigned int DSR:1;
 335         unsigned int DCD:1;
 336         unsigned int RI:1;
 337         unsigned int CTS:1;
 338         unsigned int reserverd:4;
 339         u8 port;
 340 } __attribute__ ((packed));
 341
 342 /* This stores all control uplink flags */
 343 struct ctrl_ul {
 344         unsigned int DTR:1;
 345         unsigned int RTS:1;
 346         unsigned int reserved:6;
 347         u8 port;
 348 } __attribute__ ((packed));
 349 #endif
 350
 351 /* This holds all information that is needed regarding a port */
 352 struct port {
 353         struct tty_port port;
 354         u8 update_flow_control;
 355         struct ctrl_ul ctrl_ul;
 356         struct ctrl_dl ctrl_dl;
 357         struct kfifo fifo_ul;
 358         void __iomem *dl_addr[2];
 359         u32 dl_size[2];
 360         u8 toggle_dl;
 361         void __iomem *ul_addr[2];
 362         u32 ul_size[2];
 363         u8 toggle_ul;
 364         u16 token_dl;
 365
 366         wait_queue_head_t tty_wait;
 367         struct async_icount tty_icount;
 368
 369         struct nozomi *dc;
 370 };
 371
 372 /* Private data one for each card in the system */
 373 struct nozomi {
 374         void __iomem *base_addr;
 375         unsigned long flip;
 376
 377         /* Pointers to registers */
 378         void __iomem *reg_iir;
 379         void __iomem *reg_fcr;
 380         void __iomem *reg_ier;
 381
 382         u16 last_ier;
 383         enum card_type card_type;
 384         struct config_table config_table;       /* Configuration table */
 385         struct pci_dev *pdev;
 386         struct port port[NOZOMI_MAX_PORTS];
 387         u8 *send_buf;
 388
 389         spinlock_t spin_mutex;  /* secures access to registers and tty */
 390
 391         unsigned int index_start;
 392         enum card_state state;
 393         u32 open_ttys;
 394 };
 395
 396 /* This is a data packet that is read or written to/from card */
 397 struct buffer {
 398         u32 size;               /* size is the length of the data buffer */
 399         u8 *data;
 400 } __attribute__ ((packed));
 401
 402 /*    Global variables */
 403 static const struct pci_device_id nozomi_pci_tbl[] __devinitconst = {
 404         {PCI_DEVICE(0x1931, 0x000c)},   /* Nozomi HSDPA */
 405         {},
 406 };
 407
 408 MODULE_DEVICE_TABLE(pci, nozomi_pci_tbl);
 409
 410 static struct nozomi *ndevs[NOZOMI_MAX_CARDS];
 411 static struct tty_driver *ntty_driver;
 412
 413 static const struct tty_port_operations noz_tty_port_ops;
 414
 415 /*
 416  * find card by tty_index
 417  */
 418 static inline struct nozomi *get_dc_by_tty(const struct tty_struct *tty)
 419 {
 420         return tty ? ndevs[tty->index / MAX_PORT] : NULL;
 421 }
 422
 423 static inline struct port *get_port_by_tty(const struct tty_struct *tty)
 424 {
 425         struct nozomi *ndev = get_dc_by_tty(tty);
 426         return ndev ? &ndev->port[tty->index % MAX_PORT] : NULL;
 427 }
 428
 429 /*
 430  * TODO:
 431  * -Optimize
 432  * -Rewrite cleaner
 433  */
 434
 435 static void read_mem32(u32 *buf, const void __iomem *mem_addr_start,
 436                         u32 size_bytes)
 437 {
 438         u32 i = 0;
 439         const u32 __iomem *ptr = mem_addr_start;
 440         u16 *buf16;
 441
 442         if (unlikely(!ptr || !buf))
 443                 goto out;
 444
 445         /* shortcut for extremely often used cases */
 446         switch (size_bytes) {
 447         case 2: /* 2 bytes */
 448                 buf16 = (u16 *) buf;
 449                 *buf16 = __le16_to_cpu(readw(ptr));
 450                 goto out;
 451                 break;
 452         case 4: /* 4 bytes */
 453                 *(buf) = __le32_to_cpu(readl(ptr));
 454                 goto out;
 455                 break;
 456         }
 457
 458         while (i < size_bytes) {
 459                 if (size_bytes - i == 2) {
 460                         /* Handle 2 bytes in the end */
 461                         buf16 = (u16 *) buf;
 462                         *(buf16) = __le16_to_cpu(readw(ptr));
 463                         i += 2;
 464                 } else {
 465                         /* Read 4 bytes */
 466                         *(buf) = __le32_to_cpu(readl(ptr));
 467                         i += 4;
 468                 }
 469                 buf++;
 470                 ptr++;
 471         }
 472 out:
 473         return;
 474 }
 475
 476 /*
 477  * TODO:
 478  * -Optimize
 479  * -Rewrite cleaner
 480  */
 481 static u32 write_mem32(void __iomem *mem_addr_start, const u32 *buf,
 482                         u32 size_bytes)
 483 {
 484         u32 i = 0;
 485         u32 __iomem *ptr = mem_addr_start;
 486         const u16 *buf16;
 487
 488         if (unlikely(!ptr || !buf))
 489                 return 0;
 490
 491         /* shortcut for extremely often used cases */
 492         switch (size_bytes) {
 493         case 2: /* 2 bytes */
 494                 buf16 = (const u16 *)buf;
 495                 writew(__cpu_to_le16(*buf16), ptr);
 496                 return 2;
 497                 break;
 498         case 1: /*
 499                  * also needs to write 4 bytes in this case
 500                  * so falling through..
 501                  */
 502         case 4: /* 4 bytes */
 503                 writel(__cpu_to_le32(*buf), ptr);
 504                 return 4;
 505                 break;
 506         }
 507
 508         while (i < size_bytes) {
 509                 if (size_bytes - i == 2) {
 510                         /* 2 bytes */
 511                         buf16 = (const u16 *)buf;
 512                         writew(__cpu_to_le16(*buf16), ptr);
 513                         i += 2;
 514                 } else {
 515                         /* 4 bytes */
 516                         writel(__cpu_to_le32(*buf), ptr);
 517                         i += 4;
 518                 }
 519                 buf++;
 520                 ptr++;
 521         }
 522         return i;
 523 }
 524
 525 /* Setup pointers to different channels and also setup buffer sizes. */
 526 static void setup_memory(struct nozomi *dc)
 527 {
 528         void __iomem *offset = dc->base_addr + dc->config_table.dl_start;
 529         /* The length reported is including the length field of 4 bytes,
 530          * hence subtract with 4.
 531          */
 532         const u16 buff_offset = 4;
 533
 534         /* Modem port dl configuration */
 535         dc->port[PORT_MDM].dl_addr[CH_A] = offset;
 536         dc->port[PORT_MDM].dl_addr[CH_B] =
 537                                 (offset += dc->config_table.dl_mdm_len1);
 538         dc->port[PORT_MDM].dl_size[CH_A] =
 539                                 dc->config_table.dl_mdm_len1 - buff_offset;
 540         dc->port[PORT_MDM].dl_size[CH_B] =
 541                                 dc->config_table.dl_mdm_len2 - buff_offset;
 542
 543         /* Diag port dl configuration */
 544         dc->port[PORT_DIAG].dl_addr[CH_A] =
 545                                 (offset += dc->config_table.dl_mdm_len2);
 546         dc->port[PORT_DIAG].dl_size[CH_A] =
 547                                 dc->config_table.dl_diag_len1 - buff_offset;
 548         dc->port[PORT_DIAG].dl_addr[CH_B] =
 549                                 (offset += dc->config_table.dl_diag_len1);
 550         dc->port[PORT_DIAG].dl_size[CH_B] =
 551                                 dc->config_table.dl_diag_len2 - buff_offset;
 552
 553         /* App1 port dl configuration */
 554         dc->port[PORT_APP1].dl_addr[CH_A] =
 555                                 (offset += dc->config_table.dl_diag_len2);
 556         dc->port[PORT_APP1].dl_size[CH_A] =
 557                                 dc->config_table.dl_app1_len - buff_offset;
 558
 559         /* App2 port dl configuration */
 560         dc->port[PORT_APP2].dl_addr[CH_A] =
 561                                 (offset += dc->config_table.dl_app1_len);
 562         dc->port[PORT_APP2].dl_size[CH_A] =
 563                                 dc->config_table.dl_app2_len - buff_offset;
 564
 565         /* Ctrl dl configuration */
 566         dc->port[PORT_CTRL].dl_addr[CH_A] =
 567                                 (offset += dc->config_table.dl_app2_len);
 568         dc->port[PORT_CTRL].dl_size[CH_A] =
 569                                 dc->config_table.dl_ctrl_len - buff_offset;
 570
 571         offset = dc->base_addr + dc->config_table.ul_start;
 572
 573         /* Modem Port ul configuration */
 574         dc->port[PORT_MDM].ul_addr[CH_A] = offset;
 575         dc->port[PORT_MDM].ul_size[CH_A] =
 576                                 dc->config_table.ul_mdm_len1 - buff_offset;
 577         dc->port[PORT_MDM].ul_addr[CH_B] =
 578                                 (offset += dc->config_table.ul_mdm_len1);
 579         dc->port[PORT_MDM].ul_size[CH_B] =
 580                                 dc->config_table.ul_mdm_len2 - buff_offset;
 581
 582         /* Diag port ul configuration */
 583         dc->port[PORT_DIAG].ul_addr[CH_A] =
 584                                 (offset += dc->config_table.ul_mdm_len2);
 585         dc->port[PORT_DIAG].ul_size[CH_A] =
 586                                 dc->config_table.ul_diag_len - buff_offset;
 587
 588         /* App1 port ul configuration */
 589         dc->port[PORT_APP1].ul_addr[CH_A] =
 590                                 (offset += dc->config_table.ul_diag_len);
 591         dc->port[PORT_APP1].ul_size[CH_A] =
 592                                 dc->config_table.ul_app1_len - buff_offset;
 593
 594         /* App2 port ul configuration */
 595         dc->port[PORT_APP2].ul_addr[CH_A] =
 596                                 (offset += dc->config_table.ul_app1_len);
 597         dc->port[PORT_APP2].ul_size[CH_A] =
 598                                 dc->config_table.ul_app2_len - buff_offset;
 599
 600         /* Ctrl ul configuration */
 601         dc->port[PORT_CTRL].ul_addr[CH_A] =
 602                                 (offset += dc->config_table.ul_app2_len);
 603         dc->port[PORT_CTRL].ul_size[CH_A] =
 604                                 dc->config_table.ul_ctrl_len - buff_offset;
 605 }
 606
 607 /* Dump config table under initalization phase */
 608 #ifdef DEBUG
 609 static void dump_table(const struct nozomi *dc)
 610 {
 611         DBG3("signature: 0x%08X", dc->config_table.signature);
 612         DBG3("version: 0x%04X", dc->config_table.version);
 613         DBG3("product_information: 0x%04X", \
 614                                 dc->config_table.product_information);
 615         DBG3("toggle enabled: %d", dc->config_table.toggle.enabled);
 616         DBG3("toggle up_mdm: %d", dc->config_table.toggle.mdm_ul);
 617         DBG3("toggle dl_mdm: %d", dc->config_table.toggle.mdm_dl);
 618         DBG3("toggle dl_dbg: %d", dc->config_table.toggle.diag_dl);
 619
 620         DBG3("dl_start: 0x%04X", dc->config_table.dl_start);
 621         DBG3("dl_mdm_len0: 0x%04X, %d", dc->config_table.dl_mdm_len1,
 622            dc->config_table.dl_mdm_len1);
 623         DBG3("dl_mdm_len1: 0x%04X, %d", dc->config_table.dl_mdm_len2,
 624            dc->config_table.dl_mdm_len2);
 625         DBG3("dl_diag_len0: 0x%04X, %d", dc->config_table.dl_diag_len1,
 626            dc->config_table.dl_diag_len1);
 627         DBG3("dl_diag_len1: 0x%04X, %d", dc->config_table.dl_diag_len2,
 628            dc->config_table.dl_diag_len2);
 629         DBG3("dl_app1_len: 0x%04X, %d", dc->config_table.dl_app1_len,
 630            dc->config_table.dl_app1_len);
 631         DBG3("dl_app2_len: 0x%04X, %d", dc->config_table.dl_app2_len,
 632            dc->config_table.dl_app2_len);
 633         DBG3("dl_ctrl_len: 0x%04X, %d", dc->config_table.dl_ctrl_len,
 634            dc->config_table.dl_ctrl_len);
 635         DBG3("ul_start: 0x%04X, %d", dc->config_table.ul_start,
 636            dc->config_table.ul_start);
 637         DBG3("ul_mdm_len[0]: 0x%04X, %d", dc->config_table.ul_mdm_len1,
 638            dc->config_table.ul_mdm_len1);
 639         DBG3("ul_mdm_len[1]: 0x%04X, %d", dc->config_table.ul_mdm_len2,
 640            dc->config_table.ul_mdm_len2);
 641         DBG3("ul_diag_len: 0x%04X, %d", dc->config_table.ul_diag_len,
 642            dc->config_table.ul_diag_len);
 643         DBG3("ul_app1_len: 0x%04X, %d", dc->config_table.ul_app1_len,
 644            dc->config_table.ul_app1_len);
 645         DBG3("ul_app2_len: 0x%04X, %d", dc->config_table.ul_app2_len,
 646            dc->config_table.ul_app2_len);
 647         DBG3("ul_ctrl_len: 0x%04X, %d", dc->config_table.ul_ctrl_len,
 648            dc->config_table.ul_ctrl_len);
 649 }
 650 #else
 651 static inline void dump_table(const struct nozomi *dc) { }
 652 #endif
 653
 654 /*
 655  * Read configuration table from card under intalization phase
 656  * Returns 1 if ok, else 0
 657  */
 658 static int nozomi_read_config_table(struct nozomi *dc)
 659 {
 660         read_mem32((u32 *) &dc->config_table, dc->base_addr + 0,
 661                                                 sizeof(struct config_table));
 662
 663         if (dc->config_table.signature != CONFIG_MAGIC) {
 664                 dev_err(&dc->pdev->dev, "ConfigTable Bad! 0x%08X != 0x%08X\n",
 665                         dc->config_table.signature, CONFIG_MAGIC);
 666                 return 0;
 667         }
 668
 669         if ((dc->config_table.version == 0)
 670             || (dc->config_table.toggle.enabled == TOGGLE_VALID)) {
 671                 int i;
 672                 DBG1("Second phase, configuring card");
 673
 674                 setup_memory(dc);
 675
 676                 dc->port[PORT_MDM].toggle_ul = dc->config_table.toggle.mdm_ul;
 677                 dc->port[PORT_MDM].toggle_dl = dc->config_table.toggle.mdm_dl;
 678                 dc->port[PORT_DIAG].toggle_dl = dc->config_table.toggle.diag_dl;
 679                 DBG1("toggle ports: MDM UL:%d MDM DL:%d, DIAG DL:%d",
 680                    dc->port[PORT_MDM].toggle_ul,
 681                    dc->port[PORT_MDM].toggle_dl, dc->port[PORT_DIAG].toggle_dl);
 682
 683                 dump_table(dc);
 684
 685                 for (i = PORT_MDM; i < MAX_PORT; i++) {
 686                         memset(&dc->port[i].ctrl_dl, 0, sizeof(struct ctrl_dl));
 687                         memset(&dc->port[i].ctrl_ul, 0, sizeof(struct ctrl_ul));
 688                 }
 689
 690                 /* Enable control channel */
 691                 dc->last_ier = dc->last_ier | CTRL_DL;
 692                 writew(dc->last_ier, dc->reg_ier);
 693
 694                 dc->state = NOZOMI_STATE_ALLOCATED;
 695                 dev_info(&dc->pdev->dev, "Initialization OK!\n");
 696                 return 1;
 697         }
 698
 699         if ((dc->config_table.version > 0)
 700             && (dc->config_table.toggle.enabled != TOGGLE_VALID)) {
 701                 u32 offset = 0;
 702                 DBG1("First phase: pushing upload buffers, clearing download");
 703
 704                 dev_info(&dc->pdev->dev, "Version of card: %d\n",
 705                          dc->config_table.version);
 706
 707                 /* Here we should disable all I/O over F32. */
 708                 setup_memory(dc);
 709
 710                 /*
 711                  * We should send ALL channel pair tokens back along
 712                  * with reset token
 713                  */
 714
 715                 /* push upload modem buffers */
 716                 write_mem32(dc->port[PORT_MDM].ul_addr[CH_A],
 717                         (u32 *) &offset, 4);
 718                 write_mem32(dc->port[PORT_MDM].ul_addr[CH_B],
 719                         (u32 *) &offset, 4);
 720
 721                 writew(MDM_UL | DIAG_DL | MDM_DL, dc->reg_fcr);
 722
 723                 DBG1("First phase done");
 724         }
 725
 726         return 1;
 727 }
 728
 729 /* Enable uplink interrupts  */
 730 static void enable_transmit_ul(enum port_type port, struct nozomi *dc)
 731 {
 732         static const u16 mask[] = {MDM_UL, DIAG_UL, APP1_UL, APP2_UL, CTRL_UL};
 733
 734         if (port < NOZOMI_MAX_PORTS) {
 735                 dc->last_ier |= mask[port];
 736                 writew(dc->last_ier, dc->reg_ier);
 737         } else {
 738                 dev_err(&dc->pdev->dev, "Called with wrong port?\n");
 739         }
 740 }
 741
 742 /* Disable uplink interrupts  */
 743 static void disable_transmit_ul(enum port_type port, struct nozomi *dc)
 744 {
 745         static const u16 mask[] =
 746                 {~MDM_UL, ~DIAG_UL, ~APP1_UL, ~APP2_UL, ~CTRL_UL};
 747
 748         if (port < NOZOMI_MAX_PORTS) {
 749                 dc->last_ier &= mask[port];
 750                 writew(dc->last_ier, dc->reg_ier);
 751         } else {
 752                 dev_err(&dc->pdev->dev, "Called with wrong port?\n");
 753         }
 754 }
 755
 756 /* Enable downlink interrupts */
 757 static void enable_transmit_dl(enum port_type port, struct nozomi *dc)
 758 {
 759         static const u16 mask[] = {MDM_DL, DIAG_DL, APP1_DL, APP2_DL, CTRL_DL};
 760
 761         if (port < NOZOMI_MAX_PORTS) {
 762                 dc->last_ier |= mask[port];
 763                 writew(dc->last_ier, dc->reg_ier);
 764         } else {
 765                 dev_err(&dc->pdev->dev, "Called with wrong port?\n");
 766         }
 767 }
 768
 769 /* Disable downlink interrupts */
 770 static void disable_transmit_dl(enum port_type port, struct nozomi *dc)
 771 {
 772         static const u16 mask[] =
 773                 {~MDM_DL, ~DIAG_DL, ~APP1_DL, ~APP2_DL, ~CTRL_DL};
 774
 775         if (port < NOZOMI_MAX_PORTS) {
 776                 dc->last_ier &= mask[port];
 777                 writew(dc->last_ier, dc->reg_ier);
 778         } else {
 779                 dev_err(&dc->pdev->dev, "Called with wrong port?\n");
 780         }
 781 }
 782
 783 /*
 784  * Return 1 - send buffer to card and ack.
 785  * Return 0 - don't ack, don't send buffer to card.
 786  */
 787 static int send_data(enum port_type index, struct nozomi *dc)
 788 {
 789         u32 size = 0;
 790         struct port *port = &dc->port[index];
 791         const u8 toggle = port->toggle_ul;
 792         void __iomem *addr = port->ul_addr[toggle];
 793         const u32 ul_size = port->ul_size[toggle];
 794         struct tty_struct *tty = tty_port_tty_get(&port->port);
 795
 796         /* Get data from tty and place in buf for now */
 797         size = kfifo_out(&port->fifo_ul, dc->send_buf,
 798                            ul_size < SEND_BUF_MAX ? ul_size : SEND_BUF_MAX);
 799
 800         if (size == 0) {
 801                 DBG4("No more data to send, disable link:");
 802                 tty_kref_put(tty);
 803                 return 0;
 804         }
 805
 806         /* DUMP(buf, size); */
 807
 808         /* Write length + data */
 809         write_mem32(addr, (u32 *) &size, 4);
 810         write_mem32(addr + 4, (u32 *) dc->send_buf, size);
 811
 812         if (tty)
 813                 tty_wakeup(tty);
 814
 815         tty_kref_put(tty);
 816         return 1;
 817 }
 818
 819 /* If all data has been read, return 1, else 0 */
 820 static int receive_data(enum port_type index, struct nozomi *dc)
 821 {
 822         u8 buf[RECEIVE_BUF_MAX] = { 0 };
 823         int size;
 824         u32 offset = 4;
 825         struct port *port = &dc->port[index];
 826         void __iomem *addr = port->dl_addr[port->toggle_dl];
 827         struct tty_struct *tty = tty_port_tty_get(&port->port);
 828         int i, ret;
 829
 830         if (unlikely(!tty)) {
 831                 DBG1("tty not open for port: %d?", index);
 832                 return 1;
 833         }
 834
 835         read_mem32((u32 *) &size, addr, 4);
 836         /*  DBG1( "%d bytes port: %d", size, index); */
 837
 838         if (test_bit(TTY_THROTTLED, &tty->flags)) {
 839                 DBG1("No room in tty, don't read data, don't ack interrupt, "
 840                         "disable interrupt");
 841
 842                 /* disable interrupt in downlink... */
 843                 disable_transmit_dl(index, dc);
 844                 ret = 0;
 845                 goto put;
 846         }
 847
 848         if (unlikely(size == 0)) {
 849                 dev_err(&dc->pdev->dev, "size == 0?\n");
 850                 ret = 1;
 851                 goto put;
 852         }
 853
 854         while (size > 0) {
 855                 read_mem32((u32 *) buf, addr + offset, RECEIVE_BUF_MAX);
 856
 857                 if (size == 1) {
 858                         tty_insert_flip_char(tty, buf[0], TTY_NORMAL);
 859                         size = 0;
 860                 } else if (size < RECEIVE_BUF_MAX) {
 861                         size -= tty_insert_flip_string(tty, (char *) buf, size);
 862                 } else {
 863                         i = tty_insert_flip_string(tty, \
 864                                                 (char *) buf, RECEIVE_BUF_MAX);
 865                         size -= i;
 866                         offset += i;
 867                 }
 868         }
 869
 870         set_bit(index, &dc->flip);
 871         ret = 1;
 872 put:
 873         tty_kref_put(tty);
 874         return ret;
 875 }
 876
 877 /* Debug for interrupts */
 878 #ifdef DEBUG
 879 static char *interrupt2str(u16 interrupt)
 880 {
 881         static char buf[TMP_BUF_MAX];
 882         char *p = buf;
 883
 884         interrupt & MDM_DL1 ? p += snprintf(p, TMP_BUF_MAX, "MDM_DL1 ") : NULL;
 885         interrupt & MDM_DL2 ? p += snprintf(p, TMP_BUF_MAX - (p - buf),
 886                                         "MDM_DL2 ") : NULL;
 887
 888         interrupt & MDM_UL1 ? p += snprintf(p, TMP_BUF_MAX - (p - buf),
 889                                         "MDM_UL1 ") : NULL;
 890         interrupt & MDM_UL2 ? p += snprintf(p, TMP_BUF_MAX - (p - buf),
 891                                         "MDM_UL2 ") : NULL;
 892
 893         interrupt & DIAG_DL1 ? p += snprintf(p, TMP_BUF_MAX - (p - buf),
 894                                         "DIAG_DL1 ") : NULL;
 895         interrupt & DIAG_DL2 ? p += snprintf(p, TMP_BUF_MAX - (p - buf),
 896                                         "DIAG_DL2 ") : NULL;
 897
 898         interrupt & DIAG_UL ? p += snprintf(p, TMP_BUF_MAX - (p - buf),
 899                                         "DIAG_UL ") : NULL;
 900
 901         interrupt & APP1_DL ? p += snprintf(p, TMP_BUF_MAX - (p - buf),
 902                                         "APP1_DL ") : NULL;
 903         interrupt & APP2_DL ? p += snprintf(p, TMP_BUF_MAX - (p - buf),
 904                                         "APP2_DL ") : NULL;
 905
 906         interrupt & APP1_UL ? p += snprintf(p, TMP_BUF_MAX - (p - buf),
 907                                         "APP1_UL ") : NULL;
 908         interrupt & APP2_UL ? p += snprintf(p, TMP_BUF_MAX - (p - buf),
 909                                         "APP2_UL ") : NULL;
 910
 911         interrupt & CTRL_DL ? p += snprintf(p, TMP_BUF_MAX - (p - buf),
 912                                         "CTRL_DL ") : NULL;
 913         interrupt & CTRL_UL ? p += snprintf(p, TMP_BUF_MAX - (p - buf),
 914                                         "CTRL_UL ") : NULL;
 915
 916         interrupt & RESET ? p += snprintf(p, TMP_BUF_MAX - (p - buf),
 917                                         "RESET ") : NULL;
 918
 919         return buf;
 920 }
 921 #endif
 922
 923 /*
 924  * Receive flow control
 925  * Return 1 - If ok, else 0
 926  */
 927 static int receive_flow_control(struct nozomi *dc)
 928 {
 929         enum port_type port = PORT_MDM;
 930         struct ctrl_dl ctrl_dl;
 931         struct ctrl_dl old_ctrl;
 932         u16 enable_ier = 0;
 933
 934         read_mem32((u32 *) &ctrl_dl, dc->port[PORT_CTRL].dl_addr[CH_A], 2);
 935
 936         switch (ctrl_dl.port) {
 937         case CTRL_CMD:
 938                 DBG1("The Base Band sends this value as a response to a "
 939                         "request for IMSI detach sent over the control "
 940                         "channel uplink (see section 7.6.1).");
 941                 break;
 942         case CTRL_MDM:
 943                 port = PORT_MDM;
 944                 enable_ier = MDM_DL;
 945                 break;
 946         case CTRL_DIAG:
 947                 port = PORT_DIAG;
 948                 enable_ier = DIAG_DL;
 949                 break;
 950         case CTRL_APP1:
 951                 port = PORT_APP1;
 952                 enable_ier = APP1_DL;
 953                 break;
 954         case CTRL_APP2:
 955                 port = PORT_APP2;
 956                 enable_ier = APP2_DL;
 957                 if (dc->state == NOZOMI_STATE_ALLOCATED) {
 958                         /*
 959                          * After card initialization the flow control
 960                          * received for APP2 is always the last
 961                          */
 962                         dc->state = NOZOMI_STATE_READY;
 963                         dev_info(&dc->pdev->dev, "Device READY!\n");
 964                 }
 965                 break;
 966         default:
 967                 dev_err(&dc->pdev->dev,
 968                         "ERROR: flow control received for non-existing port\n");
 969                 return 0;
 970         };
 971
 972         DBG1("0x%04X->0x%04X", *((u16 *)&dc->port[port].ctrl_dl),
 973            *((u16 *)&ctrl_dl));
 974
 975         old_ctrl = dc->port[port].ctrl_dl;
 976         dc->port[port].ctrl_dl = ctrl_dl;
 977
 978         if (old_ctrl.CTS == 1 && ctrl_dl.CTS == 0) {
 979                 DBG1("Disable interrupt (0x%04X) on port: %d",
 980                         enable_ier, port);
 981                 disable_transmit_ul(port, dc);
 982
 983         } else if (old_ctrl.CTS == 0 && ctrl_dl.CTS == 1) {
 984
 985                 if (kfifo_len(&dc->port[port].fifo_ul)) {
 986                         DBG1("Enable interrupt (0x%04X) on port: %d",
 987                                 enable_ier, port);
 988                         DBG1("Data in buffer [%d], enable transmit! ",
 989                                 kfifo_len(&dc->port[port].fifo_ul));
 990                         enable_transmit_ul(port, dc);
 991                 } else {
 992                         DBG1("No data in buffer...");
 993                 }
 994         }
 995
 996         if (*(u16 *)&old_ctrl == *(u16 *)&ctrl_dl) {
 997                 DBG1(" No change in mctrl");
 998                 return 1;
 999         }
1000         /* Update statistics */
1001         if (old_ctrl.CTS != ctrl_dl.CTS)
1002                 dc->port[port].tty_icount.cts++;
1003         if (old_ctrl.DSR != ctrl_dl.DSR)
1004                 dc->port[port].tty_icount.dsr++;
1005         if (old_ctrl.RI != ctrl_dl.RI)
1006                 dc->port[port].tty_icount.rng++;
1007         if (old_ctrl.DCD != ctrl_dl.DCD)
1008                 dc->port[port].tty_icount.dcd++;
1009
1010         wake_up_interruptible(&dc->port[port].tty_wait);
1011
1012         DBG1("port: %d DCD(%d), CTS(%d), RI(%d), DSR(%d)",
1013            port,
1014            dc->port[port].tty_icount.dcd, dc->port[port].tty_icount.cts,
1015            dc->port[port].tty_icount.rng, dc->port[port].tty_icount.dsr);
1016
1017         return 1;
1018 }
1019
1020 static enum ctrl_port_type port2ctrl(enum port_type port,
1021                                         const struct nozomi *dc)
1022 {
1023         switch (port) {
1024         case PORT_MDM:
1025                 return CTRL_MDM;
1026         case PORT_DIAG:
1027                 return CTRL_DIAG;
1028         case PORT_APP1:
1029                 return CTRL_APP1;
1030         case PORT_APP2:
1031                 return CTRL_APP2;
1032         default:
1033                 dev_err(&dc->pdev->dev,
1034                         "ERROR: send flow control " \
1035                         "received for non-existing port\n");
1036         };
1037         return CTRL_ERROR;
1038 }
1039
1040 /*
1041  * Send flow control, can only update one channel at a time
1042  * Return 0 - If we have updated all flow control
1043  * Return 1 - If we need to update more flow control, ack current enable more
1044  */
1045 static int send_flow_control(struct nozomi *dc)
1046 {
1047         u32 i, more_flow_control_to_be_updated = 0;
1048         u16 *ctrl;
1049
1050         for (i = PORT_MDM; i < MAX_PORT; i++) {
1051                 if (dc->port[i].update_flow_control) {
1052                         if (more_flow_control_to_be_updated) {
1053                                 /* We have more flow control to be updated */
1054                                 return 1;
1055                         }
1056                         dc->port[i].ctrl_ul.port = port2ctrl(i, dc);
1057                         ctrl = (u16 *)&dc->port[i].ctrl_ul;
1058                         write_mem32(dc->port[PORT_CTRL].ul_addr[0], \
1059                                 (u32 *) ctrl, 2);
1060                         dc->port[i].update_flow_control = 0;
1061                         more_flow_control_to_be_updated = 1;
1062                 }
1063         }
1064         return 0;
1065 }
1066
1067 /*
1068  * Handle downlink data, ports that are handled are modem and diagnostics
1069  * Return 1 - ok
1070  * Return 0 - toggle fields are out of sync
1071  */
1072 static int handle_data_dl(struct nozomi *dc, enum port_type port, u8 *toggle,
1073                         u16 read_iir, u16 mask1, u16 mask2)
1074 {
1075         if (*toggle == 0 && read_iir & mask1) {
1076                 if (receive_data(port, dc)) {
1077                         writew(mask1, dc->reg_fcr);
1078                         *toggle = !(*toggle);
1079                 }
1080
1081                 if (read_iir & mask2) {
1082                         if (receive_data(port, dc)) {
1083                                 writew(mask2, dc->reg_fcr);
1084                                 *toggle = !(*toggle);
1085                         }
1086                 }
1087         } else if (*toggle == 1 && read_iir & mask2) {
1088                 if (receive_data(port, dc)) {
1089                         writew(mask2, dc->reg_fcr);
1090                         *toggle = !(*toggle);
1091                 }
1092
1093                 if (read_iir & mask1) {
1094                         if (receive_data(port, dc)) {
1095                                 writew(mask1, dc->reg_fcr);
1096                                 *toggle = !(*toggle);
1097                         }
1098                 }
1099         } else {
1100                 dev_err(&dc->pdev->dev, "port out of sync!, toggle:%d\n",
1101                         *toggle);
1102                 return 0;
1103         }
1104         return 1;
1105 }
1106
1107 /*
1108  * Handle uplink data, this is currently for the modem port
1109  * Return 1 - ok
1110  * Return 0 - toggle field are out of sync
1111  */
1112 static int handle_data_ul(struct nozomi *dc, enum port_type port, u16 read_iir)
1113 {
1114         u8 *toggle = &(dc->port[port].toggle_ul);
1115
1116         if (*toggle == 0 && read_iir & MDM_UL1) {
1117                 dc->last_ier &= ~MDM_UL;
1118                 writew(dc->last_ier, dc->reg_ier);
1119                 if (send_data(port, dc)) {
1120                         writew(MDM_UL1, dc->reg_fcr);
1121                         dc->last_ier = dc->last_ier | MDM_UL;
1122                         writew(dc->last_ier, dc->reg_ier);
1123                         *toggle = !*toggle;
1124                 }
1125
1126                 if (read_iir & MDM_UL2) {
1127                         dc->last_ier &= ~MDM_UL;
1128                         writew(dc->last_ier, dc->reg_ier);
1129                         if (send_data(port, dc)) {
1130                                 writew(MDM_UL2, dc->reg_fcr);
1131                                 dc->last_ier = dc->last_ier | MDM_UL;
1132                                 writew(dc->last_ier, dc->reg_ier);
1133                                 *toggle = !*toggle;
1134                         }
1135                 }
1136
1137         } else if (*toggle == 1 && read_iir & MDM_UL2) {
1138                 dc->last_ier &= ~MDM_UL;
1139                 writew(dc->last_ier, dc->reg_ier);
1140                 if (send_data(port, dc)) {
1141                         writew(MDM_UL2, dc->reg_fcr);
1142                         dc->last_ier = dc->last_ier | MDM_UL;
1143                         writew(dc->last_ier, dc->reg_ier);
1144                         *toggle = !*toggle;
1145                 }
1146
1147                 if (read_iir & MDM_UL1) {
1148                         dc->last_ier &= ~MDM_UL;
1149                         writew(dc->last_ier, dc->reg_ier);
1150                         if (send_data(port, dc)) {
1151                                 writew(MDM_UL1, dc->reg_fcr);
1152                                 dc->last_ier = dc->last_ier | MDM_UL;
1153                                 writew(dc->last_ier, dc->reg_ier);
1154                                 *toggle = !*toggle;
1155                         }
1156                 }
1157         } else {
1158                 writew(read_iir & MDM_UL, dc->reg_fcr);
1159                 dev_err(&dc->pdev->dev, "port out of sync!\n");
1160                 return 0;
1161         }
1162         return 1;
1163 }
1164
1165 static irqreturn_t interrupt_handler(int irq, void *dev_id)
1166 {
1167         struct nozomi *dc = dev_id;
1168         unsigned int a;
1169         u16 read_iir;
1170
1171         if (!dc)
1172                 return IRQ_NONE;
1173
1174         spin_lock(&dc->spin_mutex);
1175         read_iir = readw(dc->reg_iir);
1176
1177         /* Card removed */
1178         if (read_iir == (u16)-1)
1179                 goto none;
1180         /*
1181          * Just handle interrupt enabled in IER
1182          * (by masking with dc->last_ier)
1183          */
1184         read_iir &= dc->last_ier;
1185
1186         if (read_iir == 0)
1187                 goto none;
1188
1189
1190         DBG4("%s irq:0x%04X, prev:0x%04X", interrupt2str(read_iir), read_iir,
1191                 dc->last_ier);
1192
1193         if (read_iir & RESET) {
1194                 if (unlikely(!nozomi_read_config_table(dc))) {
1195                         dc->last_ier = 0x0;
1196                         writew(dc->last_ier, dc->reg_ier);
1197                         dev_err(&dc->pdev->dev, "Could not read status from "
1198                                 "card, we should disable interface\n");
1199                 } else {
1200                         writew(RESET, dc->reg_fcr);
1201                 }
1202                 /* No more useful info if this was the reset interrupt. */
1203                 goto exit_handler;
1204         }
1205         if (read_iir & CTRL_UL) {
1206                 DBG1("CTRL_UL");
1207                 dc->last_ier &= ~CTRL_UL;
1208                 writew(dc->last_ier, dc->reg_ier);
1209                 if (send_flow_control(dc)) {
1210                         writew(CTRL_UL, dc->reg_fcr);
1211                         dc->last_ier = dc->last_ier | CTRL_UL;
1212                         writew(dc->last_ier, dc->reg_ier);
1213                 }
1214         }
1215         if (read_iir & CTRL_DL) {
1216                 receive_flow_control(dc);
1217                 writew(CTRL_DL, dc->reg_fcr);
1218         }
1219         if (read_iir & MDM_DL) {
1220                 if (!handle_data_dl(dc, PORT_MDM,
1221                                 &(dc->port[PORT_MDM].toggle_dl), read_iir,
1222                                 MDM_DL1, MDM_DL2)) {
1223                         dev_err(&dc->pdev->dev, "MDM_DL out of sync!\n");
1224                         goto exit_handler;
1225                 }
1226         }
1227         if (read_iir & MDM_UL) {
1228                 if (!handle_data_ul(dc, PORT_MDM, read_iir)) {
1229                         dev_err(&dc->pdev->dev, "MDM_UL out of sync!\n");
1230                         goto exit_handler;
1231                 }
1232         }
1233         if (read_iir & DIAG_DL) {
1234                 if (!handle_data_dl(dc, PORT_DIAG,
1235                                 &(dc->port[PORT_DIAG].toggle_dl), read_iir,
1236                                 DIAG_DL1, DIAG_DL2)) {
1237                         dev_err(&dc->pdev->dev, "DIAG_DL out of sync!\n");
1238                         goto exit_handler;
1239                 }
1240         }
1241         if (read_iir & DIAG_UL) {
1242                 dc->last_ier &= ~DIAG_UL;
1243                 writew(dc->last_ier, dc->reg_ier);
1244                 if (send_data(PORT_DIAG, dc)) {
1245                         writew(DIAG_UL, dc->reg_fcr);
1246                         dc->last_ier = dc->last_ier | DIAG_UL;
1247                         writew(dc->last_ier, dc->reg_ier);
1248                 }
1249         }
1250         if (read_iir & APP1_DL) {
1251                 if (receive_data(PORT_APP1, dc))
1252                         writew(APP1_DL, dc->reg_fcr);
1253         }
1254         if (read_iir & APP1_UL) {
1255                 dc->last_ier &= ~APP1_UL;
1256                 writew(dc->last_ier, dc->reg_ier);
1257                 if (send_data(PORT_APP1, dc)) {
1258                         writew(APP1_UL, dc->reg_fcr);
1259                         dc->last_ier = dc->last_ier | APP1_UL;
1260                         writew(dc->last_ier, dc->reg_ier);
1261                 }
1262         }
1263         if (read_iir & APP2_DL) {
1264                 if (receive_data(PORT_APP2, dc))
1265                         writew(APP2_DL, dc->reg_fcr);
1266         }
1267         if (read_iir & APP2_UL) {
1268                 dc->last_ier &= ~APP2_UL;
1269                 writew(dc->last_ier, dc->reg_ier);
1270                 if (send_data(PORT_APP2, dc)) {
1271                         writew(APP2_UL, dc->reg_fcr);
1272                         dc->last_ier = dc->last_ier | APP2_UL;
1273                         writew(dc->last_ier, dc->reg_ier);
1274                 }
1275         }
1276
1277 exit_handler:
1278         spin_unlock(&dc->spin_mutex);
1279         for (a = 0; a < NOZOMI_MAX_PORTS; a++) {
1280                 struct tty_struct *tty;
1281                 if (test_and_clear_bit(a, &dc->flip)) {
1282                         tty = tty_port_tty_get(&dc->port[a].port);
1283                         if (tty)
1284                                 tty_flip_buffer_push(tty);
1285                         tty_kref_put(tty);
1286                 }
1287         }
1288         return IRQ_HANDLED;
1289 none:
1290         spin_unlock(&dc->spin_mutex);
1291         return IRQ_NONE;
1292 }
1293
1294 static void nozomi_get_card_type(struct nozomi *dc)
1295 {
1296         int i;
1297         u32 size = 0;
1298
1299         for (i = 0; i < 6; i++)
1300                 size += pci_resource_len(dc->pdev, i);
1301
1302         /* Assume card type F32_8 if no match */
1303         dc->card_type = size == 2048 ? F32_2 : F32_8;
1304
1305         dev_info(&dc->pdev->dev, "Card type is: %d\n", dc->card_type);
1306 }
1307
1308 static void nozomi_setup_private_data(struct nozomi *dc)
1309 {
1310         void __iomem *offset = dc->base_addr + dc->card_type / 2;
1311         unsigned int i;
1312
1313         dc->reg_fcr = (void __iomem *)(offset + R_FCR);
1314         dc->reg_iir = (void __iomem *)(offset + R_IIR);
1315         dc->reg_ier = (void __iomem *)(offset + R_IER);
1316         dc->last_ier = 0;
1317         dc->flip = 0;
1318
1319         dc->port[PORT_MDM].token_dl = MDM_DL;
1320         dc->port[PORT_DIAG].token_dl = DIAG_DL;
1321         dc->port[PORT_APP1].token_dl = APP1_DL;
1322         dc->port[PORT_APP2].token_dl = APP2_DL;
1323
1324         for (i = 0; i < MAX_PORT; i++)
1325                 init_waitqueue_head(&dc->port[i].tty_wait);
1326 }
1327
1328 static ssize_t card_type_show(struct device *dev, struct device_attribute *attr,
1329                           char *buf)
1330 {
1331         const struct nozomi *dc = pci_get_drvdata(to_pci_dev(dev));
1332
1333         return sprintf(buf, "%d\n", dc->card_type);
1334 }
1335 static DEVICE_ATTR(card_type, S_IRUGO, card_type_show, NULL);
1336
1337 static ssize_t open_ttys_show(struct device *dev, struct device_attribute *attr,
1338                           char *buf)
1339 {
1340         const struct nozomi *dc = pci_get_drvdata(to_pci_dev(dev));
1341
1342         return sprintf(buf, "%u\n", dc->open_ttys);
1343 }
1344 static DEVICE_ATTR(open_ttys, S_IRUGO, open_ttys_show, NULL);
1345
1346 static void make_sysfs_files(struct nozomi *dc)
1347 {
1348         if (device_create_file(&dc->pdev->dev, &dev_attr_card_type))
1349                 dev_err(&dc->pdev->dev,
1350                         "Could not create sysfs file for card_type\n");
1351         if (device_create_file(&dc->pdev->dev, &dev_attr_open_ttys))
1352                 dev_err(&dc->pdev->dev,
1353                         "Could not create sysfs file for open_ttys\n");
1354 }
1355
1356 static void remove_sysfs_files(struct nozomi *dc)
1357 {
1358         device_remove_file(&dc->pdev->dev, &dev_attr_card_type);
1359         device_remove_file(&dc->pdev->dev, &dev_attr_open_ttys);
1360 }
1361
1362 /* Allocate memory for one device */
1363 static int __devinit nozomi_card_init(struct pci_dev *pdev,
1364                                       const struct pci_device_id *ent)
1365 {
1366         resource_size_t start;
1367         int ret;
1368         struct nozomi *dc = NULL;
1369         int ndev_idx;
1370         int i;
1371
1372         dev_dbg(&pdev->dev, "Init, new card found\n");
1373
1374         for (ndev_idx = 0; ndev_idx < ARRAY_SIZE(ndevs); ndev_idx++)
1375                 if (!ndevs[ndev_idx])
1376                         break;
1377
1378         if (ndev_idx >= ARRAY_SIZE(ndevs)) {
1379                 dev_err(&pdev->dev, "no free tty range for this card left\n");
1380                 ret = -EIO;
1381                 goto err;
1382         }
1383
1384         dc = kzalloc(sizeof(struct nozomi), GFP_KERNEL);
1385         if (unlikely(!dc)) {
1386                 dev_err(&pdev->dev, "Could not allocate memory\n");
1387                 ret = -ENOMEM;
1388                 goto err_free;
1389         }
1390
1391         dc->pdev = pdev;
1392
1393         ret = pci_enable_device(dc->pdev);
1394         if (ret) {
1395                 dev_err(&pdev->dev, "Failed to enable PCI Device\n");
1396                 goto err_free;
1397         }
1398
1399         ret = pci_request_regions(dc->pdev, NOZOMI_NAME);
1400         if (ret) {
1401                 dev_err(&pdev->dev, "I/O address 0x%04x already in use\n",
1402                         (int) /* nozomi_private.io_addr */ 0);
1403                 goto err_disable_device;
1404         }
1405
1406         start = pci_resource_start(dc->pdev, 0);
1407         if (start == 0) {
1408                 dev_err(&pdev->dev, "No I/O address for card detected\n");
1409                 ret = -ENODEV;
1410                 goto err_rel_regs;
1411         }
1412
1413         /* Find out what card type it is */
1414         nozomi_get_card_type(dc);
1415
1416         dc->base_addr = ioremap_nocache(start, dc->card_type);
1417         if (!dc->base_addr) {
1418                 dev_err(&pdev->dev, "Unable to map card MMIO\n");
1419                 ret = -ENODEV;
1420                 goto err_rel_regs;
1421         }
1422
1423         dc->send_buf = kmalloc(SEND_BUF_MAX, GFP_KERNEL);
1424         if (!dc->send_buf) {
1425                 dev_err(&pdev->dev, "Could not allocate send buffer?\n");
1426                 ret = -ENOMEM;
1427                 goto err_free_sbuf;
1428         }
1429
1430         for (i = PORT_MDM; i < MAX_PORT; i++) {
1431                 if (kfifo_alloc(&dc->port[i].fifo_ul, FIFO_BUFFER_SIZE_UL,
1432                                         GFP_KERNEL)) {
1433                         dev_err(&pdev->dev,
1434                                         "Could not allocate kfifo buffer\n");
1435                         ret = -ENOMEM;
1436                         goto err_free_kfifo;
1437                 }
1438         }
1439
1440         spin_lock_init(&dc->spin_mutex);
1441
1442         nozomi_setup_private_data(dc);
1443
1444         /* Disable all interrupts */
1445         dc->last_ier = 0;
1446         writew(dc->last_ier, dc->reg_ier);
1447
1448         ret = request_irq(pdev->irq, &interrupt_handler, IRQF_SHARED,
1449                         NOZOMI_NAME, dc);
1450         if (unlikely(ret)) {
1451                 dev_err(&pdev->dev, "can't request irq %d\n", pdev->irq);
1452                 goto err_free_kfifo;
1453         }
1454
1455         DBG1("base_addr: %p", dc->base_addr);
1456
1457         make_sysfs_files(dc);
1458
1459         dc->index_start = ndev_idx * MAX_PORT;
1460         ndevs[ndev_idx] = dc;
1461
1462         pci_set_drvdata(pdev, dc);
1463
1464         /* Enable RESET interrupt */
1465         dc->last_ier = RESET;
1466         iowrite16(dc->last_ier, dc->reg_ier);
1467
1468         dc->state = NOZOMI_STATE_ENABLED;
1469
1470         for (i = 0; i < MAX_PORT; i++) {
1471                 struct device *tty_dev;
1472                 struct port *port = &dc->port[i];
1473                 port->dc = dc;
1474                 tty_port_init(&port->port);
1475                 port->port.ops = &noz_tty_port_ops;
1476                 tty_dev = tty_register_device(ntty_driver, dc->index_start + i,
1477                                                         &pdev->dev);
1478
1479                 if (IS_ERR(tty_dev)) {
1480                         ret = PTR_ERR(tty_dev);
1481                         dev_err(&pdev->dev, "Could not allocate tty?\n");
1482                         goto err_free_tty;
1483                 }
1484         }
1485
1486         return 0;
1487
1488 err_free_tty:
1489         for (i = dc->index_start; i < dc->index_start + MAX_PORT; ++i)
1490                 tty_unregister_device(ntty_driver, i);
1491 err_free_kfifo:
1492         for (i = 0; i < MAX_PORT; i++)
1493                 kfifo_free(&dc->port[i].fifo_ul);
1494 err_free_sbuf:
1495         kfree(dc->send_buf);
1496         iounmap(dc->base_addr);
1497 err_rel_regs:
1498         pci_release_regions(pdev);
1499 err_disable_device:
1500         pci_disable_device(pdev);
1501 err_free:
1502         kfree(dc);
1503 err:
1504         return ret;
1505 }
1506
1507 static void __devexit tty_exit(struct nozomi *dc)
1508 {
1509         unsigned int i;
1510
1511         DBG1(" ");
1512
1513         for (i = 0; i < MAX_PORT; ++i) {
1514                 struct tty_struct *tty = tty_port_tty_get(&dc->port[i].port);
1515                 if (tty && list_empty(&tty->hangup_work.entry))
1516                         tty_hangup(tty);
1517                 tty_kref_put(tty);
1518         }
1519         /* Racy below - surely should wait for scheduled work to be done or
1520            complete off a hangup method ? */
1521         while (dc->open_ttys)
1522                 msleep(1);
1523         for (i = dc->index_start; i < dc->index_start + MAX_PORT; ++i)
1524                 tty_unregister_device(ntty_driver, i);
1525 }
1526
1527 /* Deallocate memory for one device */
1528 static void __devexit nozomi_card_exit(struct pci_dev *pdev)
1529 {
1530         int i;
1531         struct ctrl_ul ctrl;
1532         struct nozomi *dc = pci_get_drvdata(pdev);
1533
1534         /* Disable all interrupts */
1535         dc->last_ier = 0;
1536         writew(dc->last_ier, dc->reg_ier);
1537
1538         tty_exit(dc);
1539
1540         /* Send 0x0001, command card to resend the reset token.  */
1541         /* This is to get the reset when the module is reloaded. */
1542         ctrl.port = 0x00;
1543         ctrl.reserved = 0;
1544         ctrl.RTS = 0;
1545         ctrl.DTR = 1;
1546         DBG1("sending flow control 0x%04X", *((u16 *)&ctrl));
1547
1548         /* Setup dc->reg addresses to we can use defines here */
1549         write_mem32(dc->port[PORT_CTRL].ul_addr[0], (u32 *)&ctrl, 2);
1550         writew(CTRL_UL, dc->reg_fcr);   /* push the token to the card. */
1551
1552         remove_sysfs_files(dc);
1553
1554         free_irq(pdev->irq, dc);
1555
1556         for (i = 0; i < MAX_PORT; i++)
1557                 kfifo_free(&dc->port[i].fifo_ul);
1558
1559         kfree(dc->send_buf);
1560
1561         iounmap(dc->base_addr);
1562
1563         pci_release_regions(pdev);
1564
1565         pci_disable_device(pdev);
1566
1567         ndevs[dc->index_start / MAX_PORT] = NULL;
1568
1569         kfree(dc);
1570 }
1571
1572 static void set_rts(const struct tty_struct *tty, int rts)
1573 {
1574         struct port *port = get_port_by_tty(tty);
1575
1576         port->ctrl_ul.RTS = rts;
1577         port->update_flow_control = 1;
1578         enable_transmit_ul(PORT_CTRL, get_dc_by_tty(tty));
1579 }
1580
1581 static void set_dtr(const struct tty_struct *tty, int dtr)
1582 {
1583         struct port *port = get_port_by_tty(tty);
1584
1585         DBG1("SETTING DTR index: %d, dtr: %d", tty->index, dtr);
1586
1587         port->ctrl_ul.DTR = dtr;
1588         port->update_flow_control = 1;
1589         enable_transmit_ul(PORT_CTRL, get_dc_by_tty(tty));
1590 }
1591
1592 /*
1593  * ----------------------------------------------------------------------------
1594  * TTY code
1595  * ----------------------------------------------------------------------------
1596  */
1597
1598 static int ntty_install(struct tty_driver *driver, struct tty_struct *tty)
1599 {
1600         struct port *port = get_port_by_tty(tty);
1601         struct nozomi *dc = get_dc_by_tty(tty);
1602         int ret;
1603         if (!port || !dc || dc->state != NOZOMI_STATE_READY)
1604                 return -ENODEV;
1605         ret = tty_standard_install(driver, tty);
1606         if (ret == 0)
1607                 tty->driver_data = port;
1608         return ret;
1609 }
1610
1611 static void ntty_cleanup(struct tty_struct *tty)
1612 {
1613         tty->driver_data = NULL;
1614 }
1615
1616 static int ntty_activate(struct tty_port *tport, struct tty_struct *tty)
1617 {
1618         struct port *port = container_of(tport, struct port, port);
1619         struct nozomi *dc = port->dc;
1620         unsigned long flags;
1621
1622         DBG1("open: %d", port->token_dl);
1623         spin_lock_irqsave(&dc->spin_mutex, flags);
1624         dc->last_ier = dc->last_ier | port->token_dl;
1625         writew(dc->last_ier, dc->reg_ier);
1626         dc->open_ttys++;
1627         spin_unlock_irqrestore(&dc->spin_mutex, flags);
1628         printk("noz: activated %d: %p\n", tty->index, tport);
1629         return 0;
1630 }
1631
1632 static int ntty_open(struct tty_struct *tty, struct file *filp)
1633 {
1634         struct port *port = tty->driver_data;
1635         return tty_port_open(&port->port, tty, filp);
1636 }
1637
1638 static void ntty_shutdown(struct tty_port *tport)
1639 {
1640         struct port *port = container_of(tport, struct port, port);
1641         struct nozomi *dc = port->dc;
1642         unsigned long flags;
1643
1644         DBG1("close: %d", port->token_dl);
1645         spin_lock_irqsave(&dc->spin_mutex, flags);
1646         dc->last_ier &= ~(port->token_dl);
1647         writew(dc->last_ier, dc->reg_ier);
1648         dc->open_ttys--;
1649         spin_unlock_irqrestore(&dc->spin_mutex, flags);
1650         printk("noz: shutdown %p\n", tport);
1651 }
1652
1653 static void ntty_close(struct tty_struct *tty, struct file *filp)
1654 {
1655         struct port *port = tty->driver_data;
1656         if (port)
1657                 tty_port_close(&port->port, tty, filp);
1658 }
1659
1660 static void ntty_hangup(struct tty_struct *tty)
1661 {
1662         struct port *port = tty->driver_data;
1663         tty_port_hangup(&port->port);
1664 }
1665
1666 /*
1667  * called when the userspace process writes to the tty (/dev/noz*).
1668  * Data is inserted into a fifo, which is then read and transferred to the modem.
1669  */
1670 static int ntty_write(struct tty_struct *tty, const unsigned char *buffer,
1671                       int count)
1672 {
1673         int rval = -EINVAL;
1674         struct nozomi *dc = get_dc_by_tty(tty);
1675         struct port *port = tty->driver_data;
1676         unsigned long flags;
1677
1678         /* DBG1( "WRITEx: %d, index = %d", count, index); */
1679
1680         if (!dc || !port)
1681                 return -ENODEV;
1682
1683         rval = kfifo_in(&port->fifo_ul, (unsigned char *)buffer, count);
1684
1685         /* notify card */
1686         if (unlikely(dc == NULL)) {
1687                 DBG1("No device context?");
1688                 goto exit;
1689         }
1690
1691         spin_lock_irqsave(&dc->spin_mutex, flags);
1692         /* CTS is only valid on the modem channel */
1693         if (port == &(dc->port[PORT_MDM])) {
1694                 if (port->ctrl_dl.CTS) {
1695                         DBG4("Enable interrupt");
1696                         enable_transmit_ul(tty->index % MAX_PORT, dc);
1697                 } else {
1698                         dev_err(&dc->pdev->dev,
1699                                 "CTS not active on modem port?\n");
1700                 }
1701         } else {
1702                 enable_transmit_ul(tty->index % MAX_PORT, dc);
1703         }
1704         spin_unlock_irqrestore(&dc->spin_mutex, flags);
1705
1706 exit:
1707         return rval;
1708 }
1709
1710 /*
1711  * Calculate how much is left in device
1712  * This method is called by the upper tty layer.
1713  *   #according to sources N_TTY.c it expects a value >= 0 and
1714  *    does not check for negative values.
1715  *
1716  * If the port is unplugged report lots of room and let the bits
1717  * dribble away so we don't block anything.
1718  */
1719 static int ntty_write_room(struct tty_struct *tty)
1720 {
1721         struct port *port = tty->driver_data;
1722         int room = 4096;
1723         const struct nozomi *dc = get_dc_by_tty(tty);
1724
1725         if (dc)
1726                 room = kfifo_avail(&port->fifo_ul);
1727
1728         return room;
1729 }
1730
1731 /* Gets io control parameters */
1732 static int ntty_tiocmget(struct tty_struct *tty)
1733 {
1734         const struct port *port = tty->driver_data;
1735         const struct ctrl_dl *ctrl_dl = &port->ctrl_dl;
1736         const struct ctrl_ul *ctrl_ul = &port->ctrl_ul;
1737
1738         /* Note: these could change under us but it is not clear this
1739            matters if so */
1740         return  (ctrl_ul->RTS ? TIOCM_RTS : 0) |
1741                 (ctrl_ul->DTR ? TIOCM_DTR : 0) |
1742                 (ctrl_dl->DCD ? TIOCM_CAR : 0) |
1743                 (ctrl_dl->RI  ? TIOCM_RNG : 0) |
1744                 (ctrl_dl->DSR ? TIOCM_DSR : 0) |
1745                 (ctrl_dl->CTS ? TIOCM_CTS : 0);
1746 }
1747
1748 /* Sets io controls parameters */
1749 static int ntty_tiocmset(struct tty_struct *tty,
1750                                         unsigned int set, unsigned int clear)
1751 {
1752         struct nozomi *dc = get_dc_by_tty(tty);
1753         unsigned long flags;
1754
1755         spin_lock_irqsave(&dc->spin_mutex, flags);
1756         if (set & TIOCM_RTS)
1757                 set_rts(tty, 1);
1758         else if (clear & TIOCM_RTS)
1759                 set_rts(tty, 0);
1760
1761         if (set & TIOCM_DTR)
1762                 set_dtr(tty, 1);
1763         else if (clear & TIOCM_DTR)
1764                 set_dtr(tty, 0);
1765         spin_unlock_irqrestore(&dc->spin_mutex, flags);
1766
1767         return 0;
1768 }
1769
1770 static int ntty_cflags_changed(struct port *port, unsigned long flags,
1771                 struct async_icount *cprev)
1772 {
1773         const struct async_icount cnow = port->tty_icount;
1774         int ret;
1775
1776         ret =   ((flags & TIOCM_RNG) && (cnow.rng != cprev->rng)) ||
1777                 ((flags & TIOCM_DSR) && (cnow.dsr != cprev->dsr)) ||
1778                 ((flags & TIOCM_CD)  && (cnow.dcd != cprev->dcd)) ||
1779                 ((flags & TIOCM_CTS) && (cnow.cts != cprev->cts));
1780
1781         *cprev = cnow;
1782
1783         return ret;
1784 }
1785
1786 static int ntty_tiocgicount(struct tty_struct *tty,
1787                                 struct serial_icounter_struct *icount)
1788 {
1789         struct port *port = tty->driver_data;
1790         const struct async_icount cnow = port->tty_icount;
1791
1792         icount->cts = cnow.cts;
1793         icount->dsr = cnow.dsr;
1794         icount->rng = cnow.rng;
1795         icount->dcd = cnow.dcd;
1796         icount->rx = cnow.rx;
1797         icount->tx = cnow.tx;
1798         icount->frame = cnow.frame;
1799         icount->overrun = cnow.overrun;
1800         icount->parity = cnow.parity;
1801         icount->brk = cnow.brk;
1802         icount->buf_overrun = cnow.buf_overrun;
1803         return 0;
1804 }
1805
1806 static int ntty_ioctl(struct tty_struct *tty,
1807                       unsigned int cmd, unsigned long arg)
1808 {
1809         struct port *port = tty->driver_data;
1810         int rval = -ENOIOCTLCMD;
1811
1812         DBG1("******** IOCTL, cmd: %d", cmd);
1813
1814         switch (cmd) {
1815         case TIOCMIWAIT: {
1816                 struct async_icount cprev = port->tty_icount;
1817
1818                 rval = wait_event_interruptible(port->tty_wait,
1819                                 ntty_cflags_changed(port, arg, &cprev));
1820                 break;
1821         }
1822         default:
1823                 DBG1("ERR: 0x%08X, %d", cmd, cmd);
1824                 break;
1825         };
1826
1827         return rval;
1828 }
1829
1830 /*
1831  * Called by the upper tty layer when tty buffers are ready
1832  * to receive data again after a call to throttle.
1833  */
1834 static void ntty_unthrottle(struct tty_struct *tty)
1835 {
1836         struct nozomi *dc = get_dc_by_tty(tty);
1837         unsigned long flags;
1838
1839         DBG1("UNTHROTTLE");
1840         spin_lock_irqsave(&dc->spin_mutex, flags);
1841         enable_transmit_dl(tty->index % MAX_PORT, dc);
1842         set_rts(tty, 1);
1843
1844         spin_unlock_irqrestore(&dc->spin_mutex, flags);
1845 }
1846
1847 /*
1848  * Called by the upper tty layer when the tty buffers are almost full.
1849  * The driver should stop send more data.
1850  */
1851 static void ntty_throttle(struct tty_struct *tty)
1852 {
1853         struct nozomi *dc = get_dc_by_tty(tty);
1854         unsigned long flags;
1855
1856         DBG1("THROTTLE");
1857         spin_lock_irqsave(&dc->spin_mutex, flags);
1858         set_rts(tty, 0);
1859         spin_unlock_irqrestore(&dc->spin_mutex, flags);
1860 }
1861
1862 /* Returns number of chars in buffer, called by tty layer */
1863 static s32 ntty_chars_in_buffer(struct tty_struct *tty)
1864 {
1865         struct port *port = tty->driver_data;
1866         struct nozomi *dc = get_dc_by_tty(tty);
1867         s32 rval = 0;
1868
1869         if (unlikely(!dc || !port)) {
1870                 goto exit_in_buffer;
1871         }
1872
1873         rval = kfifo_len(&port->fifo_ul);
1874
1875 exit_in_buffer:
1876         return rval;
1877 }
1878
1879 static const struct tty_port_operations noz_tty_port_ops = {
1880         .activate = ntty_activate,
1881         .shutdown = ntty_shutdown,
1882 };
1883
1884 static const struct tty_operations tty_ops = {
1885         .ioctl = ntty_ioctl,
1886         .open = ntty_open,
1887         .close = ntty_close,
1888         .hangup = ntty_hangup,
1889         .write = ntty_write,
1890         .write_room = ntty_write_room,
1891         .unthrottle = ntty_unthrottle,
1892         .throttle = ntty_throttle,
1893         .chars_in_buffer = ntty_chars_in_buffer,
1894         .tiocmget = ntty_tiocmget,
1895         .tiocmset = ntty_tiocmset,
1896         .get_icount = ntty_tiocgicount,
1897         .install = ntty_install,
1898         .cleanup = ntty_cleanup,
1899 };
1900
1901 /* Module initialization */
1902 static struct pci_driver nozomi_driver = {
1903         .name = NOZOMI_NAME,
1904         .id_table = nozomi_pci_tbl,
1905         .probe = nozomi_card_init,
1906         .remove = __devexit_p(nozomi_card_exit),
1907 };
1908
1909 static __init int nozomi_init(void)
1910 {
1911         int ret;
1912
1913         printk(KERN_INFO "Initializing %s\n", VERSION_STRING);
1914
1915         ntty_driver = alloc_tty_driver(NTTY_TTY_MAXMINORS);
1916         if (!ntty_driver)
1917                 return -ENOMEM;
1918
1919         ntty_driver->driver_name = NOZOMI_NAME_TTY;
1920         ntty_driver->name = "noz";
1921         ntty_driver->major = 0;
1922         ntty_driver->type = TTY_DRIVER_TYPE_SERIAL;
1923         ntty_driver->subtype = SERIAL_TYPE_NORMAL;
1924         ntty_driver->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_DYNAMIC_DEV;
1925         ntty_driver->init_termios = tty_std_termios;
1926         ntty_driver->init_termios.c_cflag = B115200 | CS8 | CREAD | \
1927                                                 HUPCL | CLOCAL;
1928         ntty_driver->init_termios.c_ispeed = 115200;
1929         ntty_driver->init_termios.c_ospeed = 115200;
1930         tty_set_operations(ntty_driver, &tty_ops);
1931
1932         ret = tty_register_driver(ntty_driver);
1933         if (ret) {
1934                 printk(KERN_ERR "Nozomi: failed to register ntty driver\n");
1935                 goto free_tty;
1936         }
1937
1938         ret = pci_register_driver(&nozomi_driver);
1939         if (ret) {
1940                 printk(KERN_ERR "Nozomi: can't register pci driver\n");
1941                 goto unr_tty;
1942         }
1943
1944         return 0;
1945 unr_tty:
1946         tty_unregister_driver(ntty_driver);
1947 free_tty:
1948         put_tty_driver(ntty_driver);
1949         return ret;
1950 }
1951
1952 static __exit void nozomi_exit(void)
1953 {
1954         printk(KERN_INFO "Unloading %s\n", DRIVER_DESC);
1955         pci_unregister_driver(&nozomi_driver);
1956         tty_unregister_driver(ntty_driver);
1957         put_tty_driver(ntty_driver);
1958 }
1959
1960 module_init(nozomi_init);
1961 module_exit(nozomi_exit);
1962
1963 module_param(debug, int, S_IRUGO | S_IWUSR);
1964
1965 MODULE_LICENSE("Dual BSD/GPL");
1966 MODULE_DESCRIPTION(DRIVER_DESC);