drivers/char/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/serial.h>
  52 #include <linux/interrupt.h>
  53 #include <linux/kmod.h>
  54 #include <linux/init.h>
  55 #include <linux/kfifo.h>
  56 #include <linux/uaccess.h>
  57 #include <asm/byteorder.h>
  58
  59 #include <linux/delay.h>
  60
  61
  62 #define VERSION_STRING DRIVER_DESC " 2.1d (build date: " \
  63                                         __DATE__ " " __TIME__ ")"
  64
  65 /*    Macros definitions */
  66
  67 /* Default debug printout level */
  68 #define NOZOMI_DEBUG_LEVEL 0x00
  69
  70 #define P_BUF_SIZE 128
  71 #define NFO(_err_flag_, args...)                                \
  72 do {                                                            \
  73         char tmp[P_BUF_SIZE];                                   \
  74         snprintf(tmp, sizeof(tmp), ##args);                     \
  75         printk(_err_flag_ "[%d] %s(): %s\n", __LINE__,          \
  76                 __func__, tmp);                         \
  77 } while (0)
  78
  79 #define DBG1(args...) D_(0x01, ##args)
  80 #define DBG2(args...) D_(0x02, ##args)
  81 #define DBG3(args...) D_(0x04, ##args)
  82 #define DBG4(args...) D_(0x08, ##args)
  83 #define DBG5(args...) D_(0x10, ##args)
  84 #define DBG6(args...) D_(0x20, ##args)
  85 #define DBG7(args...) D_(0x40, ##args)
  86 #define DBG8(args...) D_(0x80, ##args)
  87
  88 #ifdef DEBUG
  89 /* Do we need this settable at runtime? */
  90 static int debug = NOZOMI_DEBUG_LEVEL;
  91
  92 #define D(lvl, args...)  do \
  93                         {if (lvl & debug) NFO(KERN_DEBUG, ##args); } \
  94                         while (0)
  95 #define D_(lvl, args...) D(lvl, ##args)
  96
  97 /* These printouts are always printed */
  98
  99 #else
 100 static int debug;
 101 #define D_(lvl, args...)
 102 #endif
 103
 104 /* TODO: rewrite to optimize macros... */
 105
 106 #define TMP_BUF_MAX 256
 107
 108 #define DUMP(buf__,len__) \
 109   do {  \
 110     char tbuf[TMP_BUF_MAX] = {0};\
 111     if (len__ > 1) {\
 112         snprintf(tbuf, len__ > TMP_BUF_MAX ? TMP_BUF_MAX : len__, "%s", buf__);\
 113         if (tbuf[len__-2] == '\r') {\
 114                 tbuf[len__-2] = 'r';\
 115         } \
 116         DBG1("SENDING: '%s' (%d+n)", tbuf, len__);\
 117     } else {\
 118         DBG1("SENDING: '%s' (%d)", tbuf, len__);\
 119     } \
 120 } while (0)
 121
 122 /*    Defines */
 123 #define NOZOMI_NAME             "nozomi"
 124 #define NOZOMI_NAME_TTY         "nozomi_tty"
 125 #define DRIVER_DESC             "Nozomi driver"
 126
 127 #define NTTY_TTY_MAXMINORS      256
 128 #define NTTY_FIFO_BUFFER_SIZE   8192
 129
 130 /* Must be power of 2 */
 131 #define FIFO_BUFFER_SIZE_UL     8192
 132
 133 /* Size of tmp send buffer to card */
 134 #define SEND_BUF_MAX            1024
 135 #define RECEIVE_BUF_MAX         4
 136
 137
 138 /* Define all types of vendors and devices to support */
 139 #define VENDOR1         0x1931  /* Vendor Option */
 140 #define DEVICE1         0x000c  /* HSDPA card */
 141
 142 #define R_IIR           0x0000  /* Interrupt Identity Register */
 143 #define R_FCR           0x0000  /* Flow Control Register */
 144 #define R_IER           0x0004  /* Interrupt Enable Register */
 145
 146 #define CONFIG_MAGIC    0xEFEFFEFE
 147 #define TOGGLE_VALID    0x0000
 148
 149 /* Definition of interrupt tokens */
 150 #define MDM_DL1         0x0001
 151 #define MDM_UL1         0x0002
 152 #define MDM_DL2         0x0004
 153 #define MDM_UL2         0x0008
 154 #define DIAG_DL1        0x0010
 155 #define DIAG_DL2        0x0020
 156 #define DIAG_UL         0x0040
 157 #define APP1_DL         0x0080
 158 #define APP1_UL         0x0100
 159 #define APP2_DL         0x0200
 160 #define APP2_UL         0x0400
 161 #define CTRL_DL         0x0800
 162 #define CTRL_UL         0x1000
 163 #define RESET           0x8000
 164
 165 #define MDM_DL          (MDM_DL1  | MDM_DL2)
 166 #define MDM_UL          (MDM_UL1  | MDM_UL2)
 167 #define DIAG_DL         (DIAG_DL1 | DIAG_DL2)
 168
 169 /* modem signal definition */
 170 #define CTRL_DSR        0x0001
 171 #define CTRL_DCD        0x0002
 172 #define CTRL_RI         0x0004
 173 #define CTRL_CTS        0x0008
 174
 175 #define CTRL_DTR        0x0001
 176 #define CTRL_RTS        0x0002
 177
 178 #define MAX_PORT                4
 179 #define NOZOMI_MAX_PORTS        5
 180 #define NOZOMI_MAX_CARDS        (NTTY_TTY_MAXMINORS / MAX_PORT)
 181
 182 /*    Type definitions */
 183
 184 /*
 185  * There are two types of nozomi cards,
 186  * one with 2048 memory and with 8192 memory
 187  */
 188 enum card_type {
 189         F32_2 = 2048,   /* 512 bytes downlink + uplink * 2 -> 2048 */
 190         F32_8 = 8192,   /* 3072 bytes downl. + 1024 bytes uplink * 2 -> 8192 */
 191 };
 192
 193 /* Initialization states a card can be in */
 194 enum card_state {
 195         NOZOMI_STATE_UKNOWN     = 0,
 196         NOZOMI_STATE_ENABLED    = 1,    /* pci device enabled */
 197         NOZOMI_STATE_ALLOCATED  = 2,    /* config setup done */
 198         NOZOMI_STATE_READY      = 3,    /* flowcontrols received */
 199 };
 200
 201 /* Two different toggle channels exist */
 202 enum channel_type {
 203         CH_A = 0,
 204         CH_B = 1,
 205 };
 206
 207 /* Port definition for the card regarding flow control */
 208 enum ctrl_port_type {
 209         CTRL_CMD        = 0,
 210         CTRL_MDM        = 1,
 211         CTRL_DIAG       = 2,
 212         CTRL_APP1       = 3,
 213         CTRL_APP2       = 4,
 214         CTRL_ERROR      = -1,
 215 };
 216
 217 /* Ports that the nozomi has */
 218 enum port_type {
 219         PORT_MDM        = 0,
 220         PORT_DIAG       = 1,
 221         PORT_APP1       = 2,
 222         PORT_APP2       = 3,
 223         PORT_CTRL       = 4,
 224         PORT_ERROR      = -1,
 225 };
 226
 227 #ifdef __BIG_ENDIAN
 228 /* Big endian */
 229
 230 struct toggles {
 231         unsigned int enabled:5; /*
 232                                  * Toggle fields are valid if enabled is 0,
 233                                  * else A-channels must always be used.
 234                                  */
 235         unsigned int diag_dl:1;
 236         unsigned int mdm_dl:1;
 237         unsigned int mdm_ul:1;
 238 } __attribute__ ((packed));
 239
 240 /* Configuration table to read at startup of card */
 241 /* Is for now only needed during initialization phase */
 242 struct config_table {
 243         u32 signature;
 244         u16 product_information;
 245         u16 version;
 246         u8 pad3[3];
 247         struct toggles toggle;
 248         u8 pad1[4];
 249         u16 dl_mdm_len1;        /*
 250                                  * If this is 64, it can hold
 251                                  * 60 bytes + 4 that is length field
 252                                  */
 253         u16 dl_start;
 254
 255         u16 dl_diag_len1;
 256         u16 dl_mdm_len2;        /*
 257                                  * If this is 64, it can hold
 258                                  * 60 bytes + 4 that is length field
 259                                  */
 260         u16 dl_app1_len;
 261
 262         u16 dl_diag_len2;
 263         u16 dl_ctrl_len;
 264         u16 dl_app2_len;
 265         u8 pad2[16];
 266         u16 ul_mdm_len1;
 267         u16 ul_start;
 268         u16 ul_diag_len;
 269         u16 ul_mdm_len2;
 270         u16 ul_app1_len;
 271         u16 ul_app2_len;
 272         u16 ul_ctrl_len;
 273 } __attribute__ ((packed));
 274
 275 /* This stores all control downlink flags */
 276 struct ctrl_dl {
 277         u8 port;
 278         unsigned int reserved:4;
 279         unsigned int CTS:1;
 280         unsigned int RI:1;
 281         unsigned int DCD:1;
 282         unsigned int DSR:1;
 283 } __attribute__ ((packed));
 284
 285 /* This stores all control uplink flags */
 286 struct ctrl_ul {
 287         u8 port;
 288         unsigned int reserved:6;
 289         unsigned int RTS:1;
 290         unsigned int DTR:1;
 291 } __attribute__ ((packed));
 292
 293 #else
 294 /* Little endian */
 295
 296 /* This represents the toggle information */
 297 struct toggles {
 298         unsigned int mdm_ul:1;
 299         unsigned int mdm_dl:1;
 300         unsigned int diag_dl:1;
 301         unsigned int enabled:5; /*
 302                                  * Toggle fields are valid if enabled is 0,
 303                                  * else A-channels must always be used.
 304                                  */
 305 } __attribute__ ((packed));
 306
 307 /* Configuration table to read at startup of card */
 308 struct config_table {
 309         u32 signature;
 310         u16 version;
 311         u16 product_information;
 312         struct toggles toggle;
 313         u8 pad1[7];
 314         u16 dl_start;
 315         u16 dl_mdm_len1;        /*
 316                                  * If this is 64, it can hold
 317                                  * 60 bytes + 4 that is length field
 318                                  */
 319         u16 dl_mdm_len2;
 320         u16 dl_diag_len1;
 321         u16 dl_diag_len2;
 322         u16 dl_app1_len;
 323         u16 dl_app2_len;
 324         u16 dl_ctrl_len;
 325         u8 pad2[16];
 326         u16 ul_start;
 327         u16 ul_mdm_len2;
 328         u16 ul_mdm_len1;
 329         u16 ul_diag_len;
 330         u16 ul_app1_len;
 331         u16 ul_app2_len;
 332         u16 ul_ctrl_len;
 333 } __attribute__ ((packed));
 334
 335 /* This stores all control downlink flags */
 336 struct ctrl_dl {
 337         unsigned int DSR:1;
 338         unsigned int DCD:1;
 339         unsigned int RI:1;
 340         unsigned int CTS:1;
 341         unsigned int reserverd:4;
 342         u8 port;
 343 } __attribute__ ((packed));
 344
 345 /* This stores all control uplink flags */
 346 struct ctrl_ul {
 347         unsigned int DTR:1;
 348         unsigned int RTS:1;
 349         unsigned int reserved:6;
 350         u8 port;
 351 } __attribute__ ((packed));
 352 #endif
 353
 354 /* This holds all information that is needed regarding a port */
 355 struct port {
 356         struct tty_port port;
 357         u8 update_flow_control;
 358         struct ctrl_ul ctrl_ul;
 359         struct ctrl_dl ctrl_dl;
 360         struct kfifo *fifo_ul;
 361         void __iomem *dl_addr[2];
 362         u32 dl_size[2];
 363         u8 toggle_dl;
 364         void __iomem *ul_addr[2];
 365         u32 ul_size[2];
 366         u8 toggle_ul;
 367         u16 token_dl;
 368
 369         /* mutex to ensure one access patch to this port */
 370         struct mutex tty_sem;
 371         wait_queue_head_t tty_wait;
 372         struct async_icount tty_icount;
 373 };
 374
 375 /* Private data one for each card in the system */
 376 struct nozomi {
 377         void __iomem *base_addr;
 378         unsigned long flip;
 379
 380         /* Pointers to registers */
 381         void __iomem *reg_iir;
 382         void __iomem *reg_fcr;
 383         void __iomem *reg_ier;
 384
 385         u16 last_ier;
 386         enum card_type card_type;
 387         struct config_table config_table;       /* Configuration table */
 388         struct pci_dev *pdev;
 389         struct port port[NOZOMI_MAX_PORTS];
 390         u8 *send_buf;
 391
 392         spinlock_t spin_mutex;  /* secures access to registers and tty */
 393
 394         unsigned int index_start;
 395         enum card_state state;
 396         u32 open_ttys;
 397 };
 398
 399 /* This is a data packet that is read or written to/from card */
 400 struct buffer {
 401         u32 size;               /* size is the length of the data buffer */
 402         u8 *data;
 403 } __attribute__ ((packed));
 404
 405 /*    Global variables */
 406 static const struct pci_device_id nozomi_pci_tbl[] __devinitconst = {
 407         {PCI_DEVICE(VENDOR1, DEVICE1)},
 408         {},
 409 };
 410
 411 MODULE_DEVICE_TABLE(pci, nozomi_pci_tbl);
 412
 413 static struct nozomi *ndevs[NOZOMI_MAX_CARDS];
 414 static struct tty_driver *ntty_driver;
 415
 416 /*
 417  * find card by tty_index
 418  */
 419 static inline struct nozomi *get_dc_by_tty(const struct tty_struct *tty)
 420 {
 421         return tty ? ndevs[tty->index / MAX_PORT] : NULL;
 422 }
 423
 424 static inline struct port *get_port_by_tty(const struct tty_struct *tty)
 425 {
 426         struct nozomi *ndev = get_dc_by_tty(tty);
 427         return ndev ? &ndev->port[tty->index % MAX_PORT] : NULL;
 428 }
 429
 430 /*
 431  * TODO:
 432  * -Optimize
 433  * -Rewrite cleaner
 434  */
 435
 436 static void read_mem32(u32 *buf, const void __iomem *mem_addr_start,
 437                         u32 size_bytes)
 438 {
 439         u32 i = 0;
 440         const u32 __iomem *ptr = mem_addr_start;
 441         u16 *buf16;
 442
 443         if (unlikely(!ptr || !buf))
 444                 goto out;
 445
 446         /* shortcut for extremely often used cases */
 447         switch (size_bytes) {
 448         case 2: /* 2 bytes */
 449                 buf16 = (u16 *) buf;
 450                 *buf16 = __le16_to_cpu(readw(ptr));
 451                 goto out;
 452                 break;
 453         case 4: /* 4 bytes */
 454                 *(buf) = __le32_to_cpu(readl(ptr));
 455                 goto out;
 456                 break;
 457         }
 458
 459         while (i < size_bytes) {
 460                 if (size_bytes - i == 2) {
 461                         /* Handle 2 bytes in the end */
 462                         buf16 = (u16 *) buf;
 463                         *(buf16) = __le16_to_cpu(readw(ptr));
 464                         i += 2;
 465                 } else {
 466                         /* Read 4 bytes */
 467                         *(buf) = __le32_to_cpu(readl(ptr));
 468                         i += 4;
 469                 }
 470                 buf++;
 471                 ptr++;
 472         }
 473 out:
 474         return;
 475 }
 476
 477 /*
 478  * TODO:
 479  * -Optimize
 480  * -Rewrite cleaner
 481  */
 482 static u32 write_mem32(void __iomem *mem_addr_start, const u32 *buf,
 483                         u32 size_bytes)
 484 {
 485         u32 i = 0;
 486         u32 __iomem *ptr = mem_addr_start;
 487         const u16 *buf16;
 488
 489         if (unlikely(!ptr || !buf))
 490                 return 0;
 491
 492         /* shortcut for extremely often used cases */
 493         switch (size_bytes) {
 494         case 2: /* 2 bytes */
 495                 buf16 = (const u16 *)buf;
 496                 writew(__cpu_to_le16(*buf16), ptr);
 497                 return 2;
 498                 break;
 499         case 1: /*
 500                  * also needs to write 4 bytes in this case
 501                  * so falling through..
 502                  */
 503         case 4: /* 4 bytes */
 504                 writel(__cpu_to_le32(*buf), ptr);
 505                 return 4;
 506                 break;
 507         }
 508
 509         while (i < size_bytes) {
 510                 if (size_bytes - i == 2) {
 511                         /* 2 bytes */
 512                         buf16 = (const u16 *)buf;
 513                         writew(__cpu_to_le16(*buf16), ptr);
 514                         i += 2;
 515                 } else {
 516                         /* 4 bytes */
 517                         writel(__cpu_to_le32(*buf), ptr);
 518                         i += 4;
 519                 }
 520                 buf++;
 521                 ptr++;
 522         }
 523         return i;
 524 }
 525
 526 /* Setup pointers to different channels and also setup buffer sizes. */
 527 static void setup_memory(struct nozomi *dc)
 528 {
 529         void __iomem *offset = dc->base_addr + dc->config_table.dl_start;
 530         /* The length reported is including the length field of 4 bytes,
 531          * hence subtract with 4.
 532          */
 533         const u16 buff_offset = 4;
 534
 535         /* Modem port dl configuration */
 536         dc->port[PORT_MDM].dl_addr[CH_A] = offset;
 537         dc->port[PORT_MDM].dl_addr[CH_B] =
 538                                 (offset += dc->config_table.dl_mdm_len1);
 539         dc->port[PORT_MDM].dl_size[CH_A] =
 540                                 dc->config_table.dl_mdm_len1 - buff_offset;
 541         dc->port[PORT_MDM].dl_size[CH_B] =
 542                                 dc->config_table.dl_mdm_len2 - buff_offset;
 543
 544         /* Diag port dl configuration */
 545         dc->port[PORT_DIAG].dl_addr[CH_A] =
 546                                 (offset += dc->config_table.dl_mdm_len2);
 547         dc->port[PORT_DIAG].dl_size[CH_A] =
 548                                 dc->config_table.dl_diag_len1 - buff_offset;
 549         dc->port[PORT_DIAG].dl_addr[CH_B] =
 550                                 (offset += dc->config_table.dl_diag_len1);
 551         dc->port[PORT_DIAG].dl_size[CH_B] =
 552                                 dc->config_table.dl_diag_len2 - buff_offset;
 553
 554         /* App1 port dl configuration */
 555         dc->port[PORT_APP1].dl_addr[CH_A] =
 556                                 (offset += dc->config_table.dl_diag_len2);
 557         dc->port[PORT_APP1].dl_size[CH_A] =
 558                                 dc->config_table.dl_app1_len - buff_offset;
 559
 560         /* App2 port dl configuration */
 561         dc->port[PORT_APP2].dl_addr[CH_A] =
 562                                 (offset += dc->config_table.dl_app1_len);
 563         dc->port[PORT_APP2].dl_size[CH_A] =
 564                                 dc->config_table.dl_app2_len - buff_offset;
 565
 566         /* Ctrl dl configuration */
 567         dc->port[PORT_CTRL].dl_addr[CH_A] =
 568                                 (offset += dc->config_table.dl_app2_len);
 569         dc->port[PORT_CTRL].dl_size[CH_A] =
 570                                 dc->config_table.dl_ctrl_len - buff_offset;
 571
 572         offset = dc->base_addr + dc->config_table.ul_start;
 573
 574         /* Modem Port ul configuration */
 575         dc->port[PORT_MDM].ul_addr[CH_A] = offset;
 576         dc->port[PORT_MDM].ul_size[CH_A] =
 577                                 dc->config_table.ul_mdm_len1 - buff_offset;
 578         dc->port[PORT_MDM].ul_addr[CH_B] =
 579                                 (offset += dc->config_table.ul_mdm_len1);
 580         dc->port[PORT_MDM].ul_size[CH_B] =
 581                                 dc->config_table.ul_mdm_len2 - buff_offset;
 582
 583         /* Diag port ul configuration */
 584         dc->port[PORT_DIAG].ul_addr[CH_A] =
 585                                 (offset += dc->config_table.ul_mdm_len2);
 586         dc->port[PORT_DIAG].ul_size[CH_A] =
 587                                 dc->config_table.ul_diag_len - buff_offset;
 588
 589         /* App1 port ul configuration */
 590         dc->port[PORT_APP1].ul_addr[CH_A] =
 591                                 (offset += dc->config_table.ul_diag_len);
 592         dc->port[PORT_APP1].ul_size[CH_A] =
 593                                 dc->config_table.ul_app1_len - buff_offset;
 594
 595         /* App2 port ul configuration */
 596         dc->port[PORT_APP2].ul_addr[CH_A] =
 597                                 (offset += dc->config_table.ul_app1_len);
 598         dc->port[PORT_APP2].ul_size[CH_A] =
 599                                 dc->config_table.ul_app2_len - buff_offset;
 600
 601         /* Ctrl ul configuration */
 602         dc->port[PORT_CTRL].ul_addr[CH_A] =
 603                                 (offset += dc->config_table.ul_app2_len);
 604         dc->port[PORT_CTRL].ul_size[CH_A] =
 605                                 dc->config_table.ul_ctrl_len - buff_offset;
 606 }
 607
 608 /* Dump config table under initalization phase */
 609 #ifdef DEBUG
 610 static void dump_table(const struct nozomi *dc)
 611 {
 612         DBG3("signature: 0x%08X", dc->config_table.signature);
 613         DBG3("version: 0x%04X", dc->config_table.version);
 614         DBG3("product_information: 0x%04X", \
 615                                 dc->config_table.product_information);
 616         DBG3("toggle enabled: %d", dc->config_table.toggle.enabled);
 617         DBG3("toggle up_mdm: %d", dc->config_table.toggle.mdm_ul);
 618         DBG3("toggle dl_mdm: %d", dc->config_table.toggle.mdm_dl);
 619         DBG3("toggle dl_dbg: %d", dc->config_table.toggle.diag_dl);
 620
 621         DBG3("dl_start: 0x%04X", dc->config_table.dl_start);
 622         DBG3("dl_mdm_len0: 0x%04X, %d", dc->config_table.dl_mdm_len1,
 623            dc->config_table.dl_mdm_len1);
 624         DBG3("dl_mdm_len1: 0x%04X, %d", dc->config_table.dl_mdm_len2,
 625            dc->config_table.dl_mdm_len2);
 626         DBG3("dl_diag_len0: 0x%04X, %d", dc->config_table.dl_diag_len1,
 627            dc->config_table.dl_diag_len1);
 628         DBG3("dl_diag_len1: 0x%04X, %d", dc->config_table.dl_diag_len2,
 629            dc->config_table.dl_diag_len2);
 630         DBG3("dl_app1_len: 0x%04X, %d", dc->config_table.dl_app1_len,
 631            dc->config_table.dl_app1_len);
 632         DBG3("dl_app2_len: 0x%04X, %d", dc->config_table.dl_app2_len,
 633            dc->config_table.dl_app2_len);
 634         DBG3("dl_ctrl_len: 0x%04X, %d", dc->config_table.dl_ctrl_len,
 635            dc->config_table.dl_ctrl_len);
 636         DBG3("ul_start: 0x%04X, %d", dc->config_table.ul_start,
 637            dc->config_table.ul_start);
 638         DBG3("ul_mdm_len[0]: 0x%04X, %d", dc->config_table.ul_mdm_len1,
 639            dc->config_table.ul_mdm_len1);
 640         DBG3("ul_mdm_len[1]: 0x%04X, %d", dc->config_table.ul_mdm_len2,
 641            dc->config_table.ul_mdm_len2);
 642         DBG3("ul_diag_len: 0x%04X, %d", dc->config_table.ul_diag_len,
 643            dc->config_table.ul_diag_len);
 644         DBG3("ul_app1_len: 0x%04X, %d", dc->config_table.ul_app1_len,
 645            dc->config_table.ul_app1_len);
 646         DBG3("ul_app2_len: 0x%04X, %d", dc->config_table.ul_app2_len,
 647            dc->config_table.ul_app2_len);
 648         DBG3("ul_ctrl_len: 0x%04X, %d", dc->config_table.ul_ctrl_len,
 649            dc->config_table.ul_ctrl_len);
 650 }
 651 #else
 652 static inline void dump_table(const struct nozomi *dc) { }
 653 #endif
 654
 655 /*
 656  * Read configuration table from card under intalization phase
 657  * Returns 1 if ok, else 0
 658  */
 659 static int nozomi_read_config_table(struct nozomi *dc)
 660 {
 661         read_mem32((u32 *) &dc->config_table, dc->base_addr + 0,
 662                                                 sizeof(struct config_table));
 663
 664         if (dc->config_table.signature != CONFIG_MAGIC) {
 665                 dev_err(&dc->pdev->dev, "ConfigTable Bad! 0x%08X != 0x%08X\n",
 666                         dc->config_table.signature, CONFIG_MAGIC);
 667                 return 0;
 668         }
 669
 670         if ((dc->config_table.version == 0)
 671             || (dc->config_table.toggle.enabled == TOGGLE_VALID)) {
 672                 int i;
 673                 DBG1("Second phase, configuring card");
 674
 675                 setup_memory(dc);
 676
 677                 dc->port[PORT_MDM].toggle_ul = dc->config_table.toggle.mdm_ul;
 678                 dc->port[PORT_MDM].toggle_dl = dc->config_table.toggle.mdm_dl;
 679                 dc->port[PORT_DIAG].toggle_dl = dc->config_table.toggle.diag_dl;
 680                 DBG1("toggle ports: MDM UL:%d MDM DL:%d, DIAG DL:%d",
 681                    dc->port[PORT_MDM].toggle_ul,
 682                    dc->port[PORT_MDM].toggle_dl, dc->port[PORT_DIAG].toggle_dl);
 683
 684                 dump_table(dc);
 685
 686                 for (i = PORT_MDM; i < MAX_PORT; i++) {
 687                         dc->port[i].fifo_ul =
 688                             kfifo_alloc(FIFO_BUFFER_SIZE_UL, GFP_ATOMIC, NULL);
 689                         memset(&dc->port[i].ctrl_dl, 0, sizeof(struct ctrl_dl));
 690                         memset(&dc->port[i].ctrl_ul, 0, sizeof(struct ctrl_ul));
 691                 }
 692
 693                 /* Enable control channel */
 694                 dc->last_ier = dc->last_ier | CTRL_DL;
 695                 writew(dc->last_ier, dc->reg_ier);
 696
 697                 dc->state = NOZOMI_STATE_ALLOCATED;
 698                 dev_info(&dc->pdev->dev, "Initialization OK!\n");
 699                 return 1;
 700         }
 701
 702         if ((dc->config_table.version > 0)
 703             && (dc->config_table.toggle.enabled != TOGGLE_VALID)) {
 704                 u32 offset = 0;
 705                 DBG1("First phase: pushing upload buffers, clearing download");
 706
 707                 dev_info(&dc->pdev->dev, "Version of card: %d\n",
 708                          dc->config_table.version);
 709
 710                 /* Here we should disable all I/O over F32. */
 711                 setup_memory(dc);
 712
 713                 /*
 714                  * We should send ALL channel pair tokens back along
 715                  * with reset token
 716                  */
 717
 718                 /* push upload modem buffers */
 719                 write_mem32(dc->port[PORT_MDM].ul_addr[CH_A],
 720                         (u32 *) &offset, 4);
 721                 write_mem32(dc->port[PORT_MDM].ul_addr[CH_B],
 722                         (u32 *) &offset, 4);
 723
 724                 writew(MDM_UL | DIAG_DL | MDM_DL, dc->reg_fcr);
 725
 726                 DBG1("First phase done");
 727         }
 728
 729         return 1;
 730 }
 731
 732 /* Enable uplink interrupts  */
 733 static void enable_transmit_ul(enum port_type port, struct nozomi *dc)
 734 {
 735         static const u16 mask[] = {MDM_UL, DIAG_UL, APP1_UL, APP2_UL, CTRL_UL};
 736
 737         if (port < NOZOMI_MAX_PORTS) {
 738                 dc->last_ier |= mask[port];
 739                 writew(dc->last_ier, dc->reg_ier);
 740         } else {
 741                 dev_err(&dc->pdev->dev, "Called with wrong port?\n");
 742         }
 743 }
 744
 745 /* Disable uplink interrupts  */
 746 static void disable_transmit_ul(enum port_type port, struct nozomi *dc)
 747 {
 748         static const u16 mask[] =
 749                 {~MDM_UL, ~DIAG_UL, ~APP1_UL, ~APP2_UL, ~CTRL_UL};
 750
 751         if (port < NOZOMI_MAX_PORTS) {
 752                 dc->last_ier &= mask[port];
 753                 writew(dc->last_ier, dc->reg_ier);
 754         } else {
 755                 dev_err(&dc->pdev->dev, "Called with wrong port?\n");
 756         }
 757 }
 758
 759 /* Enable downlink interrupts */
 760 static void enable_transmit_dl(enum port_type port, struct nozomi *dc)
 761 {
 762         static const u16 mask[] = {MDM_DL, DIAG_DL, APP1_DL, APP2_DL, CTRL_DL};
 763
 764         if (port < NOZOMI_MAX_PORTS) {
 765                 dc->last_ier |= mask[port];
 766                 writew(dc->last_ier, dc->reg_ier);
 767         } else {
 768                 dev_err(&dc->pdev->dev, "Called with wrong port?\n");
 769         }
 770 }
 771
 772 /* Disable downlink interrupts */
 773 static void disable_transmit_dl(enum port_type port, struct nozomi *dc)
 774 {
 775         static const u16 mask[] =
 776                 {~MDM_DL, ~DIAG_DL, ~APP1_DL, ~APP2_DL, ~CTRL_DL};
 777
 778         if (port < NOZOMI_MAX_PORTS) {
 779                 dc->last_ier &= mask[port];
 780                 writew(dc->last_ier, dc->reg_ier);
 781         } else {
 782                 dev_err(&dc->pdev->dev, "Called with wrong port?\n");
 783         }
 784 }
 785
 786 /*
 787  * Return 1 - send buffer to card and ack.
 788  * Return 0 - don't ack, don't send buffer to card.
 789  */
 790 static int send_data(enum port_type index, struct nozomi *dc)
 791 {
 792         u32 size = 0;
 793         struct port *port = &dc->port[index];
 794         const u8 toggle = port->toggle_ul;
 795         void __iomem *addr = port->ul_addr[toggle];
 796         const u32 ul_size = port->ul_size[toggle];
 797         struct tty_struct *tty = tty_port_tty_get(&port->port);
 798
 799         /* Get data from tty and place in buf for now */
 800         size = __kfifo_get(port->fifo_ul, dc->send_buf,
 801                            ul_size < SEND_BUF_MAX ? ul_size : SEND_BUF_MAX);
 802
 803         if (size == 0) {
 804                 DBG4("No more data to send, disable link:");
 805                 tty_kref_put(tty);
 806                 return 0;
 807         }
 808
 809         /* DUMP(buf, size); */
 810
 811         /* Write length + data */
 812         write_mem32(addr, (u32 *) &size, 4);
 813         write_mem32(addr + 4, (u32 *) dc->send_buf, size);
 814
 815         if (tty)
 816                 tty_wakeup(tty);
 817
 818         tty_kref_put(tty);
 819         return 1;
 820 }
 821
 822 /* If all data has been read, return 1, else 0 */
 823 static int receive_data(enum port_type index, struct nozomi *dc)
 824 {
 825         u8 buf[RECEIVE_BUF_MAX] = { 0 };
 826         int size;
 827         u32 offset = 4;
 828         struct port *port = &dc->port[index];
 829         void __iomem *addr = port->dl_addr[port->toggle_dl];
 830         struct tty_struct *tty = tty_port_tty_get(&port->port);
 831         int i;
 832
 833         if (unlikely(!tty)) {
 834                 DBG1("tty not open for port: %d?", index);
 835                 return 1;
 836         }
 837
 838         read_mem32((u32 *) &size, addr, 4);
 839         /*  DBG1( "%d bytes port: %d", size, index); */
 840
 841         if (test_bit(TTY_THROTTLED, &tty->flags)) {
 842                 DBG1("No room in tty, don't read data, don't ack interrupt, "
 843                         "disable interrupt");
 844
 845                 /* disable interrupt in downlink... */
 846                 disable_transmit_dl(index, dc);
 847                 return 0;
 848         }
 849
 850         if (unlikely(size == 0)) {
 851                 dev_err(&dc->pdev->dev, "size == 0?\n");
 852                 return 1;
 853         }
 854
 855         tty_buffer_request_room(tty, size);
 856
 857         while (size > 0) {
 858                 read_mem32((u32 *) buf, addr + offset, RECEIVE_BUF_MAX);
 859
 860                 if (size == 1) {
 861                         tty_insert_flip_char(tty, buf[0], TTY_NORMAL);
 862                         size = 0;
 863                 } else if (size < RECEIVE_BUF_MAX) {
 864                         size -= tty_insert_flip_string(tty, (char *) buf, size);
 865                 } else {
 866                         i = tty_insert_flip_string(tty, \
 867                                                 (char *) buf, RECEIVE_BUF_MAX);
 868                         size -= i;
 869                         offset += i;
 870                 }
 871         }
 872
 873         set_bit(index, &dc->flip);
 874         tty_kref_put(tty);
 875         return 1;
 876 }
 877
 878 /* Debug for interrupts */
 879 #ifdef DEBUG
 880 static char *interrupt2str(u16 interrupt)
 881 {
 882         static char buf[TMP_BUF_MAX];
 883         char *p = buf;
 884
 885         interrupt & MDM_DL1 ? p += snprintf(p, TMP_BUF_MAX, "MDM_DL1 ") : NULL;
 886         interrupt & MDM_DL2 ? p += snprintf(p, TMP_BUF_MAX - (p - buf),
 887                                         "MDM_DL2 ") : NULL;
 888
 889         interrupt & MDM_UL1 ? p += snprintf(p, TMP_BUF_MAX - (p - buf),
 890                                         "MDM_UL1 ") : NULL;
 891         interrupt & MDM_UL2 ? p += snprintf(p, TMP_BUF_MAX - (p - buf),
 892                                         "MDM_UL2 ") : NULL;
 893
 894         interrupt & DIAG_DL1 ? p += snprintf(p, TMP_BUF_MAX - (p - buf),
 895                                         "DIAG_DL1 ") : NULL;
 896         interrupt & DIAG_DL2 ? p += snprintf(p, TMP_BUF_MAX - (p - buf),
 897                                         "DIAG_DL2 ") : NULL;
 898
 899         interrupt & DIAG_UL ? p += snprintf(p, TMP_BUF_MAX - (p - buf),
 900                                         "DIAG_UL ") : NULL;
 901
 902         interrupt & APP1_DL ? p += snprintf(p, TMP_BUF_MAX - (p - buf),
 903                                         "APP1_DL ") : NULL;
 904         interrupt & APP2_DL ? p += snprintf(p, TMP_BUF_MAX - (p - buf),
 905                                         "APP2_DL ") : NULL;
 906
 907         interrupt & APP1_UL ? p += snprintf(p, TMP_BUF_MAX - (p - buf),
 908                                         "APP1_UL ") : NULL;
 909         interrupt & APP2_UL ? p += snprintf(p, TMP_BUF_MAX - (p - buf),
 910                                         "APP2_UL ") : NULL;
 911
 912         interrupt & CTRL_DL ? p += snprintf(p, TMP_BUF_MAX - (p - buf),
 913                                         "CTRL_DL ") : NULL;
 914         interrupt & CTRL_UL ? p += snprintf(p, TMP_BUF_MAX - (p - buf),
 915                                         "CTRL_UL ") : NULL;
 916
 917         interrupt & RESET ? p += snprintf(p, TMP_BUF_MAX - (p - buf),
 918                                         "RESET ") : NULL;
 919
 920         return buf;
 921 }
 922 #endif
 923
 924 /*
 925  * Receive flow control
 926  * Return 1 - If ok, else 0
 927  */
 928 static int receive_flow_control(struct nozomi *dc)
 929 {
 930         enum port_type port = PORT_MDM;
 931         struct ctrl_dl ctrl_dl;
 932         struct ctrl_dl old_ctrl;
 933         u16 enable_ier = 0;
 934
 935         read_mem32((u32 *) &ctrl_dl, dc->port[PORT_CTRL].dl_addr[CH_A], 2);
 936
 937         switch (ctrl_dl.port) {
 938         case CTRL_CMD:
 939                 DBG1("The Base Band sends this value as a response to a "
 940                         "request for IMSI detach sent over the control "
 941                         "channel uplink (see section 7.6.1).");
 942                 break;
 943         case CTRL_MDM:
 944                 port = PORT_MDM;
 945                 enable_ier = MDM_DL;
 946                 break;
 947         case CTRL_DIAG:
 948                 port = PORT_DIAG;
 949                 enable_ier = DIAG_DL;
 950                 break;
 951         case CTRL_APP1:
 952                 port = PORT_APP1;
 953                 enable_ier = APP1_DL;
 954                 break;
 955         case CTRL_APP2:
 956                 port = PORT_APP2;
 957                 enable_ier = APP2_DL;
 958                 if (dc->state == NOZOMI_STATE_ALLOCATED) {
 959                         /*
 960                          * After card initialization the flow control
 961                          * received for APP2 is always the last
 962                          */
 963                         dc->state = NOZOMI_STATE_READY;
 964                         dev_info(&dc->pdev->dev, "Device READY!\n");
 965                 }
 966                 break;
 967         default:
 968                 dev_err(&dc->pdev->dev,
 969                         "ERROR: flow control received for non-existing port\n");
 970                 return 0;
 971         };
 972
 973         DBG1("0x%04X->0x%04X", *((u16 *)&dc->port[port].ctrl_dl),
 974            *((u16 *)&ctrl_dl));
 975
 976         old_ctrl = dc->port[port].ctrl_dl;
 977         dc->port[port].ctrl_dl = ctrl_dl;
 978
 979         if (old_ctrl.CTS == 1 && ctrl_dl.CTS == 0) {
 980                 DBG1("Disable interrupt (0x%04X) on port: %d",
 981                         enable_ier, port);
 982                 disable_transmit_ul(port, dc);
 983
 984         } else if (old_ctrl.CTS == 0 && ctrl_dl.CTS == 1) {
 985
 986                 if (__kfifo_len(dc->port[port].fifo_ul)) {
 987                         DBG1("Enable interrupt (0x%04X) on port: %d",
 988                                 enable_ier, port);
 989                         DBG1("Data in buffer [%d], enable transmit! ",
 990                                 __kfifo_len(dc->port[port].fifo_ul));
 991                         enable_transmit_ul(port, dc);
 992                 } else {
 993                         DBG1("No data in buffer...");
 994                 }
 995         }
 996
 997         if (*(u16 *)&old_ctrl == *(u16 *)&ctrl_dl) {
 998                 DBG1(" No change in mctrl");
 999                 return 1;
1000         }
1001         /* Update statistics */
1002         if (old_ctrl.CTS != ctrl_dl.CTS)
1003                 dc->port[port].tty_icount.cts++;
1004         if (old_ctrl.DSR != ctrl_dl.DSR)
1005                 dc->port[port].tty_icount.dsr++;
1006         if (old_ctrl.RI != ctrl_dl.RI)
1007                 dc->port[port].tty_icount.rng++;
1008         if (old_ctrl.DCD != ctrl_dl.DCD)
1009                 dc->port[port].tty_icount.dcd++;
1010
1011         wake_up_interruptible(&dc->port[port].tty_wait);
1012
1013         DBG1("port: %d DCD(%d), CTS(%d), RI(%d), DSR(%d)",
1014            port,
1015            dc->port[port].tty_icount.dcd, dc->port[port].tty_icount.cts,
1016            dc->port[port].tty_icount.rng, dc->port[port].tty_icount.dsr);
1017
1018         return 1;
1019 }
1020
1021 static enum ctrl_port_type port2ctrl(enum port_type port,
1022                                         const struct nozomi *dc)
1023 {
1024         switch (port) {
1025         case PORT_MDM:
1026                 return CTRL_MDM;
1027         case PORT_DIAG:
1028                 return CTRL_DIAG;
1029         case PORT_APP1:
1030                 return CTRL_APP1;
1031         case PORT_APP2:
1032                 return CTRL_APP2;
1033         default:
1034                 dev_err(&dc->pdev->dev,
1035                         "ERROR: send flow control " \
1036                         "received for non-existing port\n");
1037         };
1038         return CTRL_ERROR;
1039 }
1040
1041 /*
1042  * Send flow control, can only update one channel at a time
1043  * Return 0 - If we have updated all flow control
1044  * Return 1 - If we need to update more flow control, ack current enable more
1045  */
1046 static int send_flow_control(struct nozomi *dc)
1047 {
1048         u32 i, more_flow_control_to_be_updated = 0;
1049         u16 *ctrl;
1050
1051         for (i = PORT_MDM; i < MAX_PORT; i++) {
1052                 if (dc->port[i].update_flow_control) {
1053                         if (more_flow_control_to_be_updated) {
1054                                 /* We have more flow control to be updated */
1055                                 return 1;
1056                         }
1057                         dc->port[i].ctrl_ul.port = port2ctrl(i, dc);
1058                         ctrl = (u16 *)&dc->port[i].ctrl_ul;
1059                         write_mem32(dc->port[PORT_CTRL].ul_addr[0], \
1060                                 (u32 *) ctrl, 2);
1061                         dc->port[i].update_flow_control = 0;
1062                         more_flow_control_to_be_updated = 1;
1063                 }
1064         }
1065         return 0;
1066 }
1067
1068 /*
1069  * Handle downlink data, ports that are handled are modem and diagnostics
1070  * Return 1 - ok
1071  * Return 0 - toggle fields are out of sync
1072  */
1073 static int handle_data_dl(struct nozomi *dc, enum port_type port, u8 *toggle,
1074                         u16 read_iir, u16 mask1, u16 mask2)
1075 {
1076         if (*toggle == 0 && read_iir & mask1) {
1077                 if (receive_data(port, dc)) {
1078                         writew(mask1, dc->reg_fcr);
1079                         *toggle = !(*toggle);
1080                 }
1081
1082                 if (read_iir & mask2) {
1083                         if (receive_data(port, dc)) {
1084                                 writew(mask2, dc->reg_fcr);
1085                                 *toggle = !(*toggle);
1086                         }
1087                 }
1088         } else if (*toggle == 1 && read_iir & mask2) {
1089                 if (receive_data(port, dc)) {
1090                         writew(mask2, dc->reg_fcr);
1091                         *toggle = !(*toggle);
1092                 }
1093
1094                 if (read_iir & mask1) {
1095                         if (receive_data(port, dc)) {
1096                                 writew(mask1, dc->reg_fcr);
1097                                 *toggle = !(*toggle);
1098                         }
1099                 }
1100         } else {
1101                 dev_err(&dc->pdev->dev, "port out of sync!, toggle:%d\n",
1102                         *toggle);
1103                 return 0;
1104         }
1105         return 1;
1106 }
1107
1108 /*
1109  * Handle uplink data, this is currently for the modem port
1110  * Return 1 - ok
1111  * Return 0 - toggle field are out of sync
1112  */
1113 static int handle_data_ul(struct nozomi *dc, enum port_type port, u16 read_iir)
1114 {
1115         u8 *toggle = &(dc->port[port].toggle_ul);
1116
1117         if (*toggle == 0 && read_iir & MDM_UL1) {
1118                 dc->last_ier &= ~MDM_UL;
1119                 writew(dc->last_ier, dc->reg_ier);
1120                 if (send_data(port, dc)) {
1121                         writew(MDM_UL1, dc->reg_fcr);
1122                         dc->last_ier = dc->last_ier | MDM_UL;
1123                         writew(dc->last_ier, dc->reg_ier);
1124                         *toggle = !*toggle;
1125                 }
1126
1127                 if (read_iir & MDM_UL2) {
1128                         dc->last_ier &= ~MDM_UL;
1129                         writew(dc->last_ier, dc->reg_ier);
1130                         if (send_data(port, dc)) {
1131                                 writew(MDM_UL2, dc->reg_fcr);
1132                                 dc->last_ier = dc->last_ier | MDM_UL;
1133                                 writew(dc->last_ier, dc->reg_ier);
1134                                 *toggle = !*toggle;
1135                         }
1136                 }
1137
1138         } else if (*toggle == 1 && read_iir & MDM_UL2) {
1139                 dc->last_ier &= ~MDM_UL;
1140                 writew(dc->last_ier, dc->reg_ier);
1141                 if (send_data(port, dc)) {
1142                         writew(MDM_UL2, dc->reg_fcr);
1143                         dc->last_ier = dc->last_ier | MDM_UL;
1144                         writew(dc->last_ier, dc->reg_ier);
1145                         *toggle = !*toggle;
1146                 }
1147
1148                 if (read_iir & MDM_UL1) {
1149                         dc->last_ier &= ~MDM_UL;
1150                         writew(dc->last_ier, dc->reg_ier);
1151                         if (send_data(port, dc)) {
1152                                 writew(MDM_UL1, dc->reg_fcr);
1153                                 dc->last_ier = dc->last_ier | MDM_UL;
1154                                 writew(dc->last_ier, dc->reg_ier);
1155                                 *toggle = !*toggle;
1156                         }
1157                 }
1158         } else {
1159                 writew(read_iir & MDM_UL, dc->reg_fcr);
1160                 dev_err(&dc->pdev->dev, "port out of sync!\n");
1161                 return 0;
1162         }
1163         return 1;
1164 }
1165
1166 static irqreturn_t interrupt_handler(int irq, void *dev_id)
1167 {
1168         struct nozomi *dc = dev_id;
1169         unsigned int a;
1170         u16 read_iir;
1171
1172         if (!dc)
1173                 return IRQ_NONE;
1174
1175         spin_lock(&dc->spin_mutex);
1176         read_iir = readw(dc->reg_iir);
1177
1178         /* Card removed */
1179         if (read_iir == (u16)-1)
1180                 goto none;
1181         /*
1182          * Just handle interrupt enabled in IER
1183          * (by masking with dc->last_ier)
1184          */
1185         read_iir &= dc->last_ier;
1186
1187         if (read_iir == 0)
1188                 goto none;
1189
1190
1191         DBG4("%s irq:0x%04X, prev:0x%04X", interrupt2str(read_iir), read_iir,
1192                 dc->last_ier);
1193
1194         if (read_iir & RESET) {
1195                 if (unlikely(!nozomi_read_config_table(dc))) {
1196                         dc->last_ier = 0x0;
1197                         writew(dc->last_ier, dc->reg_ier);
1198                         dev_err(&dc->pdev->dev, "Could not read status from "
1199                                 "card, we should disable interface\n");
1200                 } else {
1201                         writew(RESET, dc->reg_fcr);
1202                 }
1203                 /* No more useful info if this was the reset interrupt. */
1204                 goto exit_handler;
1205         }
1206         if (read_iir & CTRL_UL) {
1207                 DBG1("CTRL_UL");
1208                 dc->last_ier &= ~CTRL_UL;
1209                 writew(dc->last_ier, dc->reg_ier);
1210                 if (send_flow_control(dc)) {
1211                         writew(CTRL_UL, dc->reg_fcr);
1212                         dc->last_ier = dc->last_ier | CTRL_UL;
1213                         writew(dc->last_ier, dc->reg_ier);
1214                 }
1215         }
1216         if (read_iir & CTRL_DL) {
1217                 receive_flow_control(dc);
1218                 writew(CTRL_DL, dc->reg_fcr);
1219         }
1220         if (read_iir & MDM_DL) {
1221                 if (!handle_data_dl(dc, PORT_MDM,
1222                                 &(dc->port[PORT_MDM].toggle_dl), read_iir,
1223                                 MDM_DL1, MDM_DL2)) {
1224                         dev_err(&dc->pdev->dev, "MDM_DL out of sync!\n");
1225                         goto exit_handler;
1226                 }
1227         }
1228         if (read_iir & MDM_UL) {
1229                 if (!handle_data_ul(dc, PORT_MDM, read_iir)) {
1230                         dev_err(&dc->pdev->dev, "MDM_UL out of sync!\n");
1231                         goto exit_handler;
1232                 }
1233         }
1234         if (read_iir & DIAG_DL) {
1235                 if (!handle_data_dl(dc, PORT_DIAG,
1236                                 &(dc->port[PORT_DIAG].toggle_dl), read_iir,
1237                                 DIAG_DL1, DIAG_DL2)) {
1238                         dev_err(&dc->pdev->dev, "DIAG_DL out of sync!\n");
1239                         goto exit_handler;
1240                 }
1241         }
1242         if (read_iir & DIAG_UL) {
1243                 dc->last_ier &= ~DIAG_UL;
1244                 writew(dc->last_ier, dc->reg_ier);
1245                 if (send_data(PORT_DIAG, dc)) {
1246                         writew(DIAG_UL, dc->reg_fcr);
1247                         dc->last_ier = dc->last_ier | DIAG_UL;
1248                         writew(dc->last_ier, dc->reg_ier);
1249                 }
1250         }
1251         if (read_iir & APP1_DL) {
1252                 if (receive_data(PORT_APP1, dc))
1253                         writew(APP1_DL, dc->reg_fcr);
1254         }
1255         if (read_iir & APP1_UL) {
1256                 dc->last_ier &= ~APP1_UL;
1257                 writew(dc->last_ier, dc->reg_ier);
1258                 if (send_data(PORT_APP1, dc)) {
1259                         writew(APP1_UL, dc->reg_fcr);
1260                         dc->last_ier = dc->last_ier | APP1_UL;
1261                         writew(dc->last_ier, dc->reg_ier);
1262                 }
1263         }
1264         if (read_iir & APP2_DL) {
1265                 if (receive_data(PORT_APP2, dc))
1266                         writew(APP2_DL, dc->reg_fcr);
1267         }
1268         if (read_iir & APP2_UL) {
1269                 dc->last_ier &= ~APP2_UL;
1270                 writew(dc->last_ier, dc->reg_ier);
1271                 if (send_data(PORT_APP2, dc)) {
1272                         writew(APP2_UL, dc->reg_fcr);
1273                         dc->last_ier = dc->last_ier | APP2_UL;
1274                         writew(dc->last_ier, dc->reg_ier);
1275                 }
1276         }
1277
1278 exit_handler:
1279         spin_unlock(&dc->spin_mutex);
1280         for (a = 0; a < NOZOMI_MAX_PORTS; a++) {
1281                 struct tty_struct *tty;
1282                 if (test_and_clear_bit(a, &dc->flip)) {
1283                         tty = tty_port_tty_get(&dc->port[a].port);
1284                         if (tty)
1285                                 tty_flip_buffer_push(tty);
1286                         tty_kref_put(tty);
1287                 }
1288         }
1289         return IRQ_HANDLED;
1290 none:
1291         spin_unlock(&dc->spin_mutex);
1292         return IRQ_NONE;
1293 }
1294
1295 static void nozomi_get_card_type(struct nozomi *dc)
1296 {
1297         int i;
1298         u32 size = 0;
1299
1300         for (i = 0; i < 6; i++)
1301                 size += pci_resource_len(dc->pdev, i);
1302
1303         /* Assume card type F32_8 if no match */
1304         dc->card_type = size == 2048 ? F32_2 : F32_8;
1305
1306         dev_info(&dc->pdev->dev, "Card type is: %d\n", dc->card_type);
1307 }
1308
1309 static void nozomi_setup_private_data(struct nozomi *dc)
1310 {
1311         void __iomem *offset = dc->base_addr + dc->card_type / 2;
1312         unsigned int i;
1313
1314         dc->reg_fcr = (void __iomem *)(offset + R_FCR);
1315         dc->reg_iir = (void __iomem *)(offset + R_IIR);
1316         dc->reg_ier = (void __iomem *)(offset + R_IER);
1317         dc->last_ier = 0;
1318         dc->flip = 0;
1319
1320         dc->port[PORT_MDM].token_dl = MDM_DL;
1321         dc->port[PORT_DIAG].token_dl = DIAG_DL;
1322         dc->port[PORT_APP1].token_dl = APP1_DL;
1323         dc->port[PORT_APP2].token_dl = APP2_DL;
1324
1325         for (i = 0; i < MAX_PORT; i++)
1326                 init_waitqueue_head(&dc->port[i].tty_wait);
1327 }
1328
1329 static ssize_t card_type_show(struct device *dev, struct device_attribute *attr,
1330                           char *buf)
1331 {
1332         const struct nozomi *dc = pci_get_drvdata(to_pci_dev(dev));
1333
1334         return sprintf(buf, "%d\n", dc->card_type);
1335 }
1336 static DEVICE_ATTR(card_type, S_IRUGO, card_type_show, NULL);
1337
1338 static ssize_t open_ttys_show(struct device *dev, struct device_attribute *attr,
1339                           char *buf)
1340 {
1341         const struct nozomi *dc = pci_get_drvdata(to_pci_dev(dev));
1342
1343         return sprintf(buf, "%u\n", dc->open_ttys);
1344 }
1345 static DEVICE_ATTR(open_ttys, S_IRUGO, open_ttys_show, NULL);
1346
1347 static void make_sysfs_files(struct nozomi *dc)
1348 {
1349         if (device_create_file(&dc->pdev->dev, &dev_attr_card_type))
1350                 dev_err(&dc->pdev->dev,
1351                         "Could not create sysfs file for card_type\n");
1352         if (device_create_file(&dc->pdev->dev, &dev_attr_open_ttys))
1353                 dev_err(&dc->pdev->dev,
1354                         "Could not create sysfs file for open_ttys\n");
1355 }
1356
1357 static void remove_sysfs_files(struct nozomi *dc)
1358 {
1359         device_remove_file(&dc->pdev->dev, &dev_attr_card_type);
1360         device_remove_file(&dc->pdev->dev, &dev_attr_open_ttys);
1361 }
1362
1363 /* Allocate memory for one device */
1364 static int __devinit nozomi_card_init(struct pci_dev *pdev,
1365                                       const struct pci_device_id *ent)
1366 {
1367         resource_size_t start;
1368         int ret;
1369         struct nozomi *dc = NULL;
1370         int ndev_idx;
1371         int i;
1372
1373         dev_dbg(&pdev->dev, "Init, new card found\n");
1374
1375         for (ndev_idx = 0; ndev_idx < ARRAY_SIZE(ndevs); ndev_idx++)
1376                 if (!ndevs[ndev_idx])
1377                         break;
1378
1379         if (ndev_idx >= ARRAY_SIZE(ndevs)) {
1380                 dev_err(&pdev->dev, "no free tty range for this card left\n");
1381                 ret = -EIO;
1382                 goto err;
1383         }
1384
1385         dc = kzalloc(sizeof(struct nozomi), GFP_KERNEL);
1386         if (unlikely(!dc)) {
1387                 dev_err(&pdev->dev, "Could not allocate memory\n");
1388                 ret = -ENOMEM;
1389                 goto err_free;
1390         }
1391
1392         dc->pdev = pdev;
1393
1394         ret = pci_enable_device(dc->pdev);
1395         if (ret) {
1396                 dev_err(&pdev->dev, "Failed to enable PCI Device\n");
1397                 goto err_free;
1398         }
1399
1400         ret = pci_request_regions(dc->pdev, NOZOMI_NAME);
1401         if (ret) {
1402                 dev_err(&pdev->dev, "I/O address 0x%04x already in use\n",
1403                         (int) /* nozomi_private.io_addr */ 0);
1404                 goto err_disable_device;
1405         }
1406
1407         start = pci_resource_start(dc->pdev, 0);
1408         if (start == 0) {
1409                 dev_err(&pdev->dev, "No I/O address for card detected\n");
1410                 ret = -ENODEV;
1411                 goto err_rel_regs;
1412         }
1413
1414         /* Find out what card type it is */
1415         nozomi_get_card_type(dc);
1416
1417         dc->base_addr = ioremap_nocache(start, dc->card_type);
1418         if (!dc->base_addr) {
1419                 dev_err(&pdev->dev, "Unable to map card MMIO\n");
1420                 ret = -ENODEV;
1421                 goto err_rel_regs;
1422         }
1423
1424         dc->send_buf = kmalloc(SEND_BUF_MAX, GFP_KERNEL);
1425         if (!dc->send_buf) {
1426                 dev_err(&pdev->dev, "Could not allocate send buffer?\n");
1427                 ret = -ENOMEM;
1428                 goto err_free_sbuf;
1429         }
1430
1431         spin_lock_init(&dc->spin_mutex);
1432
1433         nozomi_setup_private_data(dc);
1434
1435         /* Disable all interrupts */
1436         dc->last_ier = 0;
1437         writew(dc->last_ier, dc->reg_ier);
1438
1439         ret = request_irq(pdev->irq, &interrupt_handler, IRQF_SHARED,
1440                         NOZOMI_NAME, dc);
1441         if (unlikely(ret)) {
1442                 dev_err(&pdev->dev, "can't request irq %d\n", pdev->irq);
1443                 goto err_free_sbuf;
1444         }
1445
1446         DBG1("base_addr: %p", dc->base_addr);
1447
1448         make_sysfs_files(dc);
1449
1450         dc->index_start = ndev_idx * MAX_PORT;
1451         ndevs[ndev_idx] = dc;
1452
1453         pci_set_drvdata(pdev, dc);
1454
1455         /* Enable RESET interrupt */
1456         dc->last_ier = RESET;
1457         iowrite16(dc->last_ier, dc->reg_ier);
1458
1459         dc->state = NOZOMI_STATE_ENABLED;
1460
1461         for (i = 0; i < MAX_PORT; i++) {
1462                 mutex_init(&dc->port[i].tty_sem);
1463                 tty_port_init(&dc->port[i].port);
1464                 tty_register_device(ntty_driver, dc->index_start + i,
1465                                                         &pdev->dev);
1466         }
1467         return 0;
1468
1469 err_free_sbuf:
1470         kfree(dc->send_buf);
1471         iounmap(dc->base_addr);
1472 err_rel_regs:
1473         pci_release_regions(pdev);
1474 err_disable_device:
1475         pci_disable_device(pdev);
1476 err_free:
1477         kfree(dc);
1478 err:
1479         return ret;
1480 }
1481
1482 static void __devexit tty_exit(struct nozomi *dc)
1483 {
1484         unsigned int i;
1485
1486         DBG1(" ");
1487
1488         flush_scheduled_work();
1489
1490         for (i = 0; i < MAX_PORT; ++i) {
1491                 struct tty_struct *tty = tty_port_tty_get(&dc->port[i].port);
1492                 if (tty && list_empty(&tty->hangup_work.entry))
1493                         tty_hangup(tty);
1494                 tty_kref_put(tty);
1495         }
1496         /* Racy below - surely should wait for scheduled work to be done or
1497            complete off a hangup method ? */
1498         while (dc->open_ttys)
1499                 msleep(1);
1500         for (i = dc->index_start; i < dc->index_start + MAX_PORT; ++i)
1501                 tty_unregister_device(ntty_driver, i);
1502 }
1503
1504 /* Deallocate memory for one device */
1505 static void __devexit nozomi_card_exit(struct pci_dev *pdev)
1506 {
1507         int i;
1508         struct ctrl_ul ctrl;
1509         struct nozomi *dc = pci_get_drvdata(pdev);
1510
1511         /* Disable all interrupts */
1512         dc->last_ier = 0;
1513         writew(dc->last_ier, dc->reg_ier);
1514
1515         tty_exit(dc);
1516
1517         /* Send 0x0001, command card to resend the reset token.  */
1518         /* This is to get the reset when the module is reloaded. */
1519         ctrl.port = 0x00;
1520         ctrl.reserved = 0;
1521         ctrl.RTS = 0;
1522         ctrl.DTR = 1;
1523         DBG1("sending flow control 0x%04X", *((u16 *)&ctrl));
1524
1525         /* Setup dc->reg addresses to we can use defines here */
1526         write_mem32(dc->port[PORT_CTRL].ul_addr[0], (u32 *)&ctrl, 2);
1527         writew(CTRL_UL, dc->reg_fcr);   /* push the token to the card. */
1528
1529         remove_sysfs_files(dc);
1530
1531         free_irq(pdev->irq, dc);
1532
1533         for (i = 0; i < MAX_PORT; i++)
1534                 if (dc->port[i].fifo_ul)
1535                         kfifo_free(dc->port[i].fifo_ul);
1536
1537         kfree(dc->send_buf);
1538
1539         iounmap(dc->base_addr);
1540
1541         pci_release_regions(pdev);
1542
1543         pci_disable_device(pdev);
1544
1545         ndevs[dc->index_start / MAX_PORT] = NULL;
1546
1547         kfree(dc);
1548 }
1549
1550 static void set_rts(const struct tty_struct *tty, int rts)
1551 {
1552         struct port *port = get_port_by_tty(tty);
1553
1554         port->ctrl_ul.RTS = rts;
1555         port->update_flow_control = 1;
1556         enable_transmit_ul(PORT_CTRL, get_dc_by_tty(tty));
1557 }
1558
1559 static void set_dtr(const struct tty_struct *tty, int dtr)
1560 {
1561         struct port *port = get_port_by_tty(tty);
1562
1563         DBG1("SETTING DTR index: %d, dtr: %d", tty->index, dtr);
1564
1565         port->ctrl_ul.DTR = dtr;
1566         port->update_flow_control = 1;
1567         enable_transmit_ul(PORT_CTRL, get_dc_by_tty(tty));
1568 }
1569
1570 /*
1571  * ----------------------------------------------------------------------------
1572  * TTY code
1573  * ----------------------------------------------------------------------------
1574  */
1575
1576 /* Called when the userspace process opens the tty, /dev/noz*.  */
1577 static int ntty_open(struct tty_struct *tty, struct file *file)
1578 {
1579         struct port *port = get_port_by_tty(tty);
1580         struct nozomi *dc = get_dc_by_tty(tty);
1581         unsigned long flags;
1582
1583         if (!port || !dc || dc->state != NOZOMI_STATE_READY)
1584                 return -ENODEV;
1585
1586         if (mutex_lock_interruptible(&port->tty_sem))
1587                 return -ERESTARTSYS;
1588
1589         port->port.count++;
1590         dc->open_ttys++;
1591
1592         /* Enable interrupt downlink for channel */
1593         if (port->port.count == 1) {
1594                 /* FIXME: is this needed now ? */
1595                 tty->low_latency = 1;
1596                 tty->driver_data = port;
1597                 tty_port_tty_set(&port->port, tty);
1598                 DBG1("open: %d", port->token_dl);
1599                 spin_lock_irqsave(&dc->spin_mutex, flags);
1600                 dc->last_ier = dc->last_ier | port->token_dl;
1601                 writew(dc->last_ier, dc->reg_ier);
1602                 spin_unlock_irqrestore(&dc->spin_mutex, flags);
1603         }
1604         mutex_unlock(&port->tty_sem);
1605         return 0;
1606 }
1607
1608 /* Called when the userspace process close the tty, /dev/noz*. Also
1609    called immediately if ntty_open fails in which case tty->driver_data
1610    will be NULL an we exit by the first return */
1611
1612 static void ntty_close(struct tty_struct *tty, struct file *file)
1613 {
1614         struct nozomi *dc = get_dc_by_tty(tty);
1615         struct port *nport = tty->driver_data;
1616         struct tty_port *port = &nport->port;
1617         unsigned long flags;
1618
1619         if (!dc || !nport)
1620                 return;
1621
1622         /* Users cannot interrupt a close */
1623         mutex_lock(&nport->tty_sem);
1624
1625         WARN_ON(!port->count);
1626
1627         dc->open_ttys--;
1628         port->count--;
1629         tty_port_tty_set(port, NULL);
1630
1631         if (port->count == 0) {
1632                 DBG1("close: %d", nport->token_dl);
1633                 spin_lock_irqsave(&dc->spin_mutex, flags);
1634                 dc->last_ier &= ~(nport->token_dl);
1635                 writew(dc->last_ier, dc->reg_ier);
1636                 spin_unlock_irqrestore(&dc->spin_mutex, flags);
1637         }
1638         mutex_unlock(&nport->tty_sem);
1639 }
1640
1641 /*
1642  * called when the userspace process writes to the tty (/dev/noz*).
1643  * Data is inserted into a fifo, which is then read and transfered to the modem.
1644  */
1645 static int ntty_write(struct tty_struct *tty, const unsigned char *buffer,
1646                       int count)
1647 {
1648         int rval = -EINVAL;
1649         struct nozomi *dc = get_dc_by_tty(tty);
1650         struct port *port = tty->driver_data;
1651         unsigned long flags;
1652
1653         /* DBG1( "WRITEx: %d, index = %d", count, index); */
1654
1655         if (!dc || !port)
1656                 return -ENODEV;
1657
1658         if (unlikely(!mutex_trylock(&port->tty_sem))) {
1659                 /*
1660                  * must test lock as tty layer wraps calls
1661                  * to this function with BKL
1662                  */
1663                 dev_err(&dc->pdev->dev, "Would have deadlocked - "
1664                         "return EAGAIN\n");
1665                 return -EAGAIN;
1666         }
1667
1668         if (unlikely(!port->port.count)) {
1669                 DBG1(" ");
1670                 goto exit;
1671         }
1672
1673         rval = __kfifo_put(port->fifo_ul, (unsigned char *)buffer, count);
1674
1675         /* notify card */
1676         if (unlikely(dc == NULL)) {
1677                 DBG1("No device context?");
1678                 goto exit;
1679         }
1680
1681         spin_lock_irqsave(&dc->spin_mutex, flags);
1682         /* CTS is only valid on the modem channel */
1683         if (port == &(dc->port[PORT_MDM])) {
1684                 if (port->ctrl_dl.CTS) {
1685                         DBG4("Enable interrupt");
1686                         enable_transmit_ul(tty->index % MAX_PORT, dc);
1687                 } else {
1688                         dev_err(&dc->pdev->dev,
1689                                 "CTS not active on modem port?\n");
1690                 }
1691         } else {
1692                 enable_transmit_ul(tty->index % MAX_PORT, dc);
1693         }
1694         spin_unlock_irqrestore(&dc->spin_mutex, flags);
1695
1696 exit:
1697         mutex_unlock(&port->tty_sem);
1698         return rval;
1699 }
1700
1701 /*
1702  * Calculate how much is left in device
1703  * This method is called by the upper tty layer.
1704  *   #according to sources N_TTY.c it expects a value >= 0 and
1705  *    does not check for negative values.
1706  */
1707 static int ntty_write_room(struct tty_struct *tty)
1708 {
1709         struct port *port = tty->driver_data;
1710         int room = 0;
1711         const struct nozomi *dc = get_dc_by_tty(tty);
1712
1713         if (!dc || !port)
1714                 return 0;
1715         if (!mutex_trylock(&port->tty_sem))
1716                 return 0;
1717
1718         if (!port->port.count)
1719                 goto exit;
1720
1721         room = port->fifo_ul->size - __kfifo_len(port->fifo_ul);
1722
1723 exit:
1724         mutex_unlock(&port->tty_sem);
1725         return room;
1726 }
1727
1728 /* Gets io control parameters */
1729 static int ntty_tiocmget(struct tty_struct *tty, struct file *file)
1730 {
1731         const struct port *port = tty->driver_data;
1732         const struct ctrl_dl *ctrl_dl = &port->ctrl_dl;
1733         const struct ctrl_ul *ctrl_ul = &port->ctrl_ul;
1734
1735         /* Note: these could change under us but it is not clear this
1736            matters if so */
1737         return  (ctrl_ul->RTS ? TIOCM_RTS : 0) |
1738                 (ctrl_ul->DTR ? TIOCM_DTR : 0) |
1739                 (ctrl_dl->DCD ? TIOCM_CAR : 0) |
1740                 (ctrl_dl->RI  ? TIOCM_RNG : 0) |
1741                 (ctrl_dl->DSR ? TIOCM_DSR : 0) |
1742                 (ctrl_dl->CTS ? TIOCM_CTS : 0);
1743 }
1744
1745 /* Sets io controls parameters */
1746 static int ntty_tiocmset(struct tty_struct *tty, struct file *file,
1747         unsigned int set, unsigned int clear)
1748 {
1749         struct nozomi *dc = get_dc_by_tty(tty);
1750         unsigned long flags;
1751
1752         spin_lock_irqsave(&dc->spin_mutex, flags);
1753         if (set & TIOCM_RTS)
1754                 set_rts(tty, 1);
1755         else if (clear & TIOCM_RTS)
1756                 set_rts(tty, 0);
1757
1758         if (set & TIOCM_DTR)
1759                 set_dtr(tty, 1);
1760         else if (clear & TIOCM_DTR)
1761                 set_dtr(tty, 0);
1762         spin_unlock_irqrestore(&dc->spin_mutex, flags);
1763
1764         return 0;
1765 }
1766
1767 static int ntty_cflags_changed(struct port *port, unsigned long flags,
1768                 struct async_icount *cprev)
1769 {
1770         const struct async_icount cnow = port->tty_icount;
1771         int ret;
1772
1773         ret =   ((flags & TIOCM_RNG) && (cnow.rng != cprev->rng)) ||
1774                 ((flags & TIOCM_DSR) && (cnow.dsr != cprev->dsr)) ||
1775                 ((flags & TIOCM_CD)  && (cnow.dcd != cprev->dcd)) ||
1776                 ((flags & TIOCM_CTS) && (cnow.cts != cprev->cts));
1777
1778         *cprev = cnow;
1779
1780         return ret;
1781 }
1782
1783 static int ntty_ioctl_tiocgicount(struct port *port, void __user *argp)
1784 {
1785         const struct async_icount cnow = port->tty_icount;
1786         struct serial_icounter_struct icount;
1787
1788         icount.cts = cnow.cts;
1789         icount.dsr = cnow.dsr;
1790         icount.rng = cnow.rng;
1791         icount.dcd = cnow.dcd;
1792         icount.rx = cnow.rx;
1793         icount.tx = cnow.tx;
1794         icount.frame = cnow.frame;
1795         icount.overrun = cnow.overrun;
1796         icount.parity = cnow.parity;
1797         icount.brk = cnow.brk;
1798         icount.buf_overrun = cnow.buf_overrun;
1799
1800         return copy_to_user(argp, &icount, sizeof(icount)) ? -EFAULT : 0;
1801 }
1802
1803 static int ntty_ioctl(struct tty_struct *tty, struct file *file,
1804                       unsigned int cmd, unsigned long arg)
1805 {
1806         struct port *port = tty->driver_data;
1807         void __user *argp = (void __user *)arg;
1808         int rval = -ENOIOCTLCMD;
1809
1810         DBG1("******** IOCTL, cmd: %d", cmd);
1811
1812         switch (cmd) {
1813         case TIOCMIWAIT: {
1814                 struct async_icount cprev = port->tty_icount;
1815
1816                 rval = wait_event_interruptible(port->tty_wait,
1817                                 ntty_cflags_changed(port, arg, &cprev));
1818                 break;
1819         } case TIOCGICOUNT:
1820                 rval = ntty_ioctl_tiocgicount(port, argp);
1821                 break;
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;
1868
1869         if (unlikely(!dc || !port)) {
1870                 rval = -ENODEV;
1871                 goto exit_in_buffer;
1872         }
1873
1874         if (unlikely(!port->port.count)) {
1875                 dev_err(&dc->pdev->dev, "No tty open?\n");
1876                 rval = -ENODEV;
1877                 goto exit_in_buffer;
1878         }
1879
1880         rval = __kfifo_len(port->fifo_ul);
1881
1882 exit_in_buffer:
1883         return rval;
1884 }
1885
1886 static const struct tty_operations tty_ops = {
1887         .ioctl = ntty_ioctl,
1888         .open = ntty_open,
1889         .close = ntty_close,
1890         .write = ntty_write,
1891         .write_room = ntty_write_room,
1892         .unthrottle = ntty_unthrottle,
1893         .throttle = ntty_throttle,
1894         .chars_in_buffer = ntty_chars_in_buffer,
1895         .tiocmget = ntty_tiocmget,
1896         .tiocmset = ntty_tiocmset,
1897 };
1898
1899 /* Module initialization */
1900 static struct pci_driver nozomi_driver = {
1901         .name = NOZOMI_NAME,
1902         .id_table = nozomi_pci_tbl,
1903         .probe = nozomi_card_init,
1904         .remove = __devexit_p(nozomi_card_exit),
1905 };
1906
1907 static __init int nozomi_init(void)
1908 {
1909         int ret;
1910
1911         printk(KERN_INFO "Initializing %s\n", VERSION_STRING);
1912
1913         ntty_driver = alloc_tty_driver(NTTY_TTY_MAXMINORS);
1914         if (!ntty_driver)
1915                 return -ENOMEM;
1916
1917         ntty_driver->owner = THIS_MODULE;
1918         ntty_driver->driver_name = NOZOMI_NAME_TTY;
1919         ntty_driver->name = "noz";
1920         ntty_driver->major = 0;
1921         ntty_driver->type = TTY_DRIVER_TYPE_SERIAL;
1922         ntty_driver->subtype = SERIAL_TYPE_NORMAL;
1923         ntty_driver->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_DYNAMIC_DEV;
1924         ntty_driver->init_termios = tty_std_termios;
1925         ntty_driver->init_termios.c_cflag = B115200 | CS8 | CREAD | \
1926                                                 HUPCL | CLOCAL;
1927         ntty_driver->init_termios.c_ispeed = 115200;
1928         ntty_driver->init_termios.c_ospeed = 115200;
1929         tty_set_operations(ntty_driver, &tty_ops);
1930
1931         ret = tty_register_driver(ntty_driver);
1932         if (ret) {
1933                 printk(KERN_ERR "Nozomi: failed to register ntty driver\n");
1934                 goto free_tty;
1935         }
1936
1937         ret = pci_register_driver(&nozomi_driver);
1938         if (ret) {
1939                 printk(KERN_ERR "Nozomi: can't register pci driver\n");
1940                 goto unr_tty;
1941         }
1942
1943         return 0;
1944 unr_tty:
1945         tty_unregister_driver(ntty_driver);
1946 free_tty:
1947         put_tty_driver(ntty_driver);
1948         return ret;
1949 }
1950
1951 static __exit void nozomi_exit(void)
1952 {
1953         printk(KERN_INFO "Unloading %s\n", DRIVER_DESC);
1954         pci_unregister_driver(&nozomi_driver);
1955         tty_unregister_driver(ntty_driver);
1956         put_tty_driver(ntty_driver);
1957 }
1958
1959 module_init(nozomi_init);
1960 module_exit(nozomi_exit);
1961
1962 module_param(debug, int, S_IRUGO | S_IWUSR);
1963
1964 MODULE_LICENSE("Dual BSD/GPL");
1965 MODULE_DESCRIPTION(DRIVER_DESC);