git.oblomov.eu Git - linux-2.6/blob - 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                 __FUNCTION__, 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         u8 update_flow_control;
 357         struct ctrl_ul ctrl_ul;
 358         struct ctrl_dl ctrl_dl;
 359         struct kfifo *fifo_ul;
 360         void __iomem *dl_addr[2];
 361         u32 dl_size[2];
 362         u8 toggle_dl;
 363         void __iomem *ul_addr[2];
 364         u32 ul_size[2];
 365         u8 toggle_ul;
 366         u16 token_dl;
 367
 368         struct tty_struct *tty;
 369         int tty_open_count;
 370         /* mutex to ensure one access patch to this port */
 371         struct mutex tty_sem;
 372         wait_queue_head_t tty_wait;
 373         struct async_icount tty_icount;
 374 };
 375
 376 /* Private data one for each card in the system */
 377 struct nozomi {
 378         void __iomem *base_addr;
 379         unsigned long flip;
 380
 381         /* Pointers to registers */
 382         void __iomem *reg_iir;
 383         void __iomem *reg_fcr;
 384         void __iomem *reg_ier;
 385
 386         u16 last_ier;
 387         enum card_type card_type;
 388         struct config_table config_table;       /* Configuration table */
 389         struct pci_dev *pdev;
 390         struct port port[NOZOMI_MAX_PORTS];
 391         u8 *send_buf;
 392
 393         spinlock_t spin_mutex;  /* secures access to registers and tty */
 394
 395         unsigned int index_start;
 396         enum card_state state;
 397         u32 open_ttys;
 398 };
 399
 400 /* This is a data packet that is read or written to/from card */
 401 struct buffer {
 402         u32 size;               /* size is the length of the data buffer */
 403         u8 *data;
 404 } __attribute__ ((packed));
 405
 406 /*    Global variables */
 407 static const struct pci_device_id nozomi_pci_tbl[] __devinitconst = {
 408         {PCI_DEVICE(VENDOR1, DEVICE1)},
 409         {},
 410 };
 411
 412 MODULE_DEVICE_TABLE(pci, nozomi_pci_tbl);
 413
 414 static struct nozomi *ndevs[NOZOMI_MAX_CARDS];
 415 static struct tty_driver *ntty_driver;
 416
 417 /*
 418  * find card by tty_index
 419  */
 420 static inline struct nozomi *get_dc_by_tty(const struct tty_struct *tty)
 421 {
 422         return tty ? ndevs[tty->index / MAX_PORT] : NULL;
 423 }
 424
 425 static inline struct port *get_port_by_tty(const struct tty_struct *tty)
 426 {
 427         struct nozomi *ndev = get_dc_by_tty(tty);
 428         return ndev ? &ndev->port[tty->index % MAX_PORT] : NULL;
 429 }
 430
 431 /*
 432  * TODO:
 433  * -Optimize
 434  * -Rewrite cleaner
 435  */
 436
 437 static void read_mem32(u32 *buf, const void __iomem *mem_addr_start,
 438                         u32 size_bytes)
 439 {
 440         u32 i = 0;
 441         const u32 *ptr = (__force u32 *) mem_addr_start;
 442         u16 *buf16;
 443
 444         if (unlikely(!ptr || !buf))
 445                 goto out;
 446
 447         /* shortcut for extremely often used cases */
 448         switch (size_bytes) {
 449         case 2: /* 2 bytes */
 450                 buf16 = (u16 *) buf;
 451                 *buf16 = __le16_to_cpu(readw((void __iomem *)ptr));
 452                 goto out;
 453                 break;
 454         case 4: /* 4 bytes */
 455                 *(buf) = __le32_to_cpu(readl((void __iomem *)ptr));
 456                 goto out;
 457                 break;
 458         }
 459
 460         while (i < size_bytes) {
 461                 if (size_bytes - i == 2) {
 462                         /* Handle 2 bytes in the end */
 463                         buf16 = (u16 *) buf;
 464                         *(buf16) = __le16_to_cpu(readw((void __iomem *)ptr));
 465                         i += 2;
 466                 } else {
 467                         /* Read 4 bytes */
 468                         *(buf) = __le32_to_cpu(readl((void __iomem *)ptr));
 469                         i += 4;
 470                 }
 471                 buf++;
 472                 ptr++;
 473         }
 474 out:
 475         return;
 476 }
 477
 478 /*
 479  * TODO:
 480  * -Optimize
 481  * -Rewrite cleaner
 482  */
 483 static u32 write_mem32(void __iomem *mem_addr_start, const u32 *buf,
 484                         u32 size_bytes)
 485 {
 486         u32 i = 0;
 487         u32 *ptr = (__force u32 *) mem_addr_start;
 488         const u16 *buf16;
 489
 490         if (unlikely(!ptr || !buf))
 491                 return 0;
 492
 493         /* shortcut for extremely often used cases */
 494         switch (size_bytes) {
 495         case 2: /* 2 bytes */
 496                 buf16 = (const u16 *)buf;
 497                 writew(__cpu_to_le16(*buf16), (void __iomem *)ptr);
 498                 return 2;
 499                 break;
 500         case 1: /*
 501                  * also needs to write 4 bytes in this case
 502                  * so falling through..
 503                  */
 504         case 4: /* 4 bytes */
 505                 writel(__cpu_to_le32(*buf), (void __iomem *)ptr);
 506                 return 4;
 507                 break;
 508         }
 509
 510         while (i < size_bytes) {
 511                 if (size_bytes - i == 2) {
 512                         /* 2 bytes */
 513                         buf16 = (const u16 *)buf;
 514                         writew(__cpu_to_le16(*buf16), (void __iomem *)ptr);
 515                         i += 2;
 516                 } else {
 517                         /* 4 bytes */
 518                         writel(__cpu_to_le32(*buf), (void __iomem *)ptr);
 519                         i += 4;
 520                 }
 521                 buf++;
 522                 ptr++;
 523         }
 524         return i;
 525 }
 526
 527 /* Setup pointers to different channels and also setup buffer sizes. */
 528 static void setup_memory(struct nozomi *dc)
 529 {
 530         void __iomem *offset = dc->base_addr + dc->config_table.dl_start;
 531         /* The length reported is including the length field of 4 bytes,
 532          * hence subtract with 4.
 533          */
 534         const u16 buff_offset = 4;
 535
 536         /* Modem port dl configuration */
 537         dc->port[PORT_MDM].dl_addr[CH_A] = offset;
 538         dc->port[PORT_MDM].dl_addr[CH_B] =
 539                                 (offset += dc->config_table.dl_mdm_len1);
 540         dc->port[PORT_MDM].dl_size[CH_A] =
 541                                 dc->config_table.dl_mdm_len1 - buff_offset;
 542         dc->port[PORT_MDM].dl_size[CH_B] =
 543                                 dc->config_table.dl_mdm_len2 - buff_offset;
 544
 545         /* Diag port dl configuration */
 546         dc->port[PORT_DIAG].dl_addr[CH_A] =
 547                                 (offset += dc->config_table.dl_mdm_len2);
 548         dc->port[PORT_DIAG].dl_size[CH_A] =
 549                                 dc->config_table.dl_diag_len1 - buff_offset;
 550         dc->port[PORT_DIAG].dl_addr[CH_B] =
 551                                 (offset += dc->config_table.dl_diag_len1);
 552         dc->port[PORT_DIAG].dl_size[CH_B] =
 553                                 dc->config_table.dl_diag_len2 - buff_offset;
 554
 555         /* App1 port dl configuration */
 556         dc->port[PORT_APP1].dl_addr[CH_A] =
 557                                 (offset += dc->config_table.dl_diag_len2);
 558         dc->port[PORT_APP1].dl_size[CH_A] =
 559                                 dc->config_table.dl_app1_len - buff_offset;
 560
 561         /* App2 port dl configuration */
 562         dc->port[PORT_APP2].dl_addr[CH_A] =
 563                                 (offset += dc->config_table.dl_app1_len);
 564         dc->port[PORT_APP2].dl_size[CH_A] =
 565                                 dc->config_table.dl_app2_len - buff_offset;
 566
 567         /* Ctrl dl configuration */
 568         dc->port[PORT_CTRL].dl_addr[CH_A] =
 569                                 (offset += dc->config_table.dl_app2_len);
 570         dc->port[PORT_CTRL].dl_size[CH_A] =
 571                                 dc->config_table.dl_ctrl_len - buff_offset;
 572
 573         offset = dc->base_addr + dc->config_table.ul_start;
 574
 575         /* Modem Port ul configuration */
 576         dc->port[PORT_MDM].ul_addr[CH_A] = offset;
 577         dc->port[PORT_MDM].ul_size[CH_A] =
 578                                 dc->config_table.ul_mdm_len1 - buff_offset;
 579         dc->port[PORT_MDM].ul_addr[CH_B] =
 580                                 (offset += dc->config_table.ul_mdm_len1);
 581         dc->port[PORT_MDM].ul_size[CH_B] =
 582                                 dc->config_table.ul_mdm_len2 - buff_offset;
 583
 584         /* Diag port ul configuration */
 585         dc->port[PORT_DIAG].ul_addr[CH_A] =
 586                                 (offset += dc->config_table.ul_mdm_len2);
 587         dc->port[PORT_DIAG].ul_size[CH_A] =
 588                                 dc->config_table.ul_diag_len - buff_offset;
 589
 590         /* App1 port ul configuration */
 591         dc->port[PORT_APP1].ul_addr[CH_A] =
 592                                 (offset += dc->config_table.ul_diag_len);
 593         dc->port[PORT_APP1].ul_size[CH_A] =
 594                                 dc->config_table.ul_app1_len - buff_offset;
 595
 596         /* App2 port ul configuration */
 597         dc->port[PORT_APP2].ul_addr[CH_A] =
 598                                 (offset += dc->config_table.ul_app1_len);
 599         dc->port[PORT_APP2].ul_size[CH_A] =
 600                                 dc->config_table.ul_app2_len - buff_offset;
 601
 602         /* Ctrl ul configuration */
 603         dc->port[PORT_CTRL].ul_addr[CH_A] =
 604                                 (offset += dc->config_table.ul_app2_len);
 605         dc->port[PORT_CTRL].ul_size[CH_A] =
 606                                 dc->config_table.ul_ctrl_len - buff_offset;
 607 }
 608
 609 /* Dump config table under initalization phase */
 610 #ifdef DEBUG
 611 static void dump_table(const struct nozomi *dc)
 612 {
 613         DBG3("signature: 0x%08X", dc->config_table.signature);
 614         DBG3("version: 0x%04X", dc->config_table.version);
 615         DBG3("product_information: 0x%04X", \
 616                                 dc->config_table.product_information);
 617         DBG3("toggle enabled: %d", dc->config_table.toggle.enabled);
 618         DBG3("toggle up_mdm: %d", dc->config_table.toggle.mdm_ul);
 619         DBG3("toggle dl_mdm: %d", dc->config_table.toggle.mdm_dl);
 620         DBG3("toggle dl_dbg: %d", dc->config_table.toggle.diag_dl);
 621
 622         DBG3("dl_start: 0x%04X", dc->config_table.dl_start);
 623         DBG3("dl_mdm_len0: 0x%04X, %d", dc->config_table.dl_mdm_len1,
 624            dc->config_table.dl_mdm_len1);
 625         DBG3("dl_mdm_len1: 0x%04X, %d", dc->config_table.dl_mdm_len2,
 626            dc->config_table.dl_mdm_len2);
 627         DBG3("dl_diag_len0: 0x%04X, %d", dc->config_table.dl_diag_len1,
 628            dc->config_table.dl_diag_len1);
 629         DBG3("dl_diag_len1: 0x%04X, %d", dc->config_table.dl_diag_len2,
 630            dc->config_table.dl_diag_len2);
 631         DBG3("dl_app1_len: 0x%04X, %d", dc->config_table.dl_app1_len,
 632            dc->config_table.dl_app1_len);
 633         DBG3("dl_app2_len: 0x%04X, %d", dc->config_table.dl_app2_len,
 634            dc->config_table.dl_app2_len);
 635         DBG3("dl_ctrl_len: 0x%04X, %d", dc->config_table.dl_ctrl_len,
 636            dc->config_table.dl_ctrl_len);
 637         DBG3("ul_start: 0x%04X, %d", dc->config_table.ul_start,
 638            dc->config_table.ul_start);
 639         DBG3("ul_mdm_len[0]: 0x%04X, %d", dc->config_table.ul_mdm_len1,
 640            dc->config_table.ul_mdm_len1);
 641         DBG3("ul_mdm_len[1]: 0x%04X, %d", dc->config_table.ul_mdm_len2,
 642            dc->config_table.ul_mdm_len2);
 643         DBG3("ul_diag_len: 0x%04X, %d", dc->config_table.ul_diag_len,
 644            dc->config_table.ul_diag_len);
 645         DBG3("ul_app1_len: 0x%04X, %d", dc->config_table.ul_app1_len,
 646            dc->config_table.ul_app1_len);
 647         DBG3("ul_app2_len: 0x%04X, %d", dc->config_table.ul_app2_len,
 648            dc->config_table.ul_app2_len);
 649         DBG3("ul_ctrl_len: 0x%04X, %d", dc->config_table.ul_ctrl_len,
 650            dc->config_table.ul_ctrl_len);
 651 }
 652 #else
 653 static inline void dump_table(const struct nozomi *dc) { }
 654 #endif
 655
 656 /*
 657  * Read configuration table from card under intalization phase
 658  * Returns 1 if ok, else 0
 659  */
 660 static int nozomi_read_config_table(struct nozomi *dc)
 661 {
 662         read_mem32((u32 *) &dc->config_table, dc->base_addr + 0,
 663                                                 sizeof(struct config_table));
 664
 665         if (dc->config_table.signature != CONFIG_MAGIC) {
 666                 dev_err(&dc->pdev->dev, "ConfigTable Bad! 0x%08X != 0x%08X\n",
 667                         dc->config_table.signature, CONFIG_MAGIC);
 668                 return 0;
 669         }
 670
 671         if ((dc->config_table.version == 0)
 672             || (dc->config_table.toggle.enabled == TOGGLE_VALID)) {
 673                 int i;
 674                 DBG1("Second phase, configuring card");
 675
 676                 setup_memory(dc);
 677
 678                 dc->port[PORT_MDM].toggle_ul = dc->config_table.toggle.mdm_ul;
 679                 dc->port[PORT_MDM].toggle_dl = dc->config_table.toggle.mdm_dl;
 680                 dc->port[PORT_DIAG].toggle_dl = dc->config_table.toggle.diag_dl;
 681                 DBG1("toggle ports: MDM UL:%d MDM DL:%d, DIAG DL:%d",
 682                    dc->port[PORT_MDM].toggle_ul,
 683                    dc->port[PORT_MDM].toggle_dl, dc->port[PORT_DIAG].toggle_dl);
 684
 685                 dump_table(dc);
 686
 687                 for (i = PORT_MDM; i < MAX_PORT; i++) {
 688                         dc->port[i].fifo_ul =
 689                             kfifo_alloc(FIFO_BUFFER_SIZE_UL, GFP_ATOMIC, NULL);
 690                         memset(&dc->port[i].ctrl_dl, 0, sizeof(struct ctrl_dl));
 691                         memset(&dc->port[i].ctrl_ul, 0, sizeof(struct ctrl_ul));
 692                 }
 693
 694                 /* Enable control channel */
 695                 dc->last_ier = dc->last_ier | CTRL_DL;
 696                 writew(dc->last_ier, dc->reg_ier);
 697
 698                 dc->state = NOZOMI_STATE_ALLOCATED;
 699                 dev_info(&dc->pdev->dev, "Initialization OK!\n");
 700                 return 1;
 701         }
 702
 703         if ((dc->config_table.version > 0)
 704             && (dc->config_table.toggle.enabled != TOGGLE_VALID)) {
 705                 u32 offset = 0;
 706                 DBG1("First phase: pushing upload buffers, clearing download");
 707
 708                 dev_info(&dc->pdev->dev, "Version of card: %d\n",
 709                          dc->config_table.version);
 710
 711                 /* Here we should disable all I/O over F32. */
 712                 setup_memory(dc);
 713
 714                 /*
 715                  * We should send ALL channel pair tokens back along
 716                  * with reset token
 717                  */
 718
 719                 /* push upload modem buffers */
 720                 write_mem32(dc->port[PORT_MDM].ul_addr[CH_A],
 721                         (u32 *) &offset, 4);
 722                 write_mem32(dc->port[PORT_MDM].ul_addr[CH_B],
 723                         (u32 *) &offset, 4);
 724
 725                 writew(MDM_UL | DIAG_DL | MDM_DL, dc->reg_fcr);
 726
 727                 DBG1("First phase done");
 728         }
 729
 730         return 1;
 731 }
 732
 733 /* Enable uplink interrupts  */
 734 static void enable_transmit_ul(enum port_type port, struct nozomi *dc)
 735 {
 736         static const u16 mask[] = {MDM_UL, DIAG_UL, APP1_UL, APP2_UL, CTRL_UL};
 737
 738         if (port < NOZOMI_MAX_PORTS) {
 739                 dc->last_ier |= mask[port];
 740                 writew(dc->last_ier, dc->reg_ier);
 741         } else {
 742                 dev_err(&dc->pdev->dev, "Called with wrong port?\n");
 743         }
 744 }
 745
 746 /* Disable uplink interrupts  */
 747 static void disable_transmit_ul(enum port_type port, struct nozomi *dc)
 748 {
 749         static const u16 mask[] =
 750                 {~MDM_UL, ~DIAG_UL, ~APP1_UL, ~APP2_UL, ~CTRL_UL};
 751
 752         if (port < NOZOMI_MAX_PORTS) {
 753                 dc->last_ier &= mask[port];
 754                 writew(dc->last_ier, dc->reg_ier);
 755         } else {
 756                 dev_err(&dc->pdev->dev, "Called with wrong port?\n");
 757         }
 758 }
 759
 760 /* Enable downlink interrupts */
 761 static void enable_transmit_dl(enum port_type port, struct nozomi *dc)
 762 {
 763         static const u16 mask[] = {MDM_DL, DIAG_DL, APP1_DL, APP2_DL, CTRL_DL};
 764
 765         if (port < NOZOMI_MAX_PORTS) {
 766                 dc->last_ier |= mask[port];
 767                 writew(dc->last_ier, dc->reg_ier);
 768         } else {
 769                 dev_err(&dc->pdev->dev, "Called with wrong port?\n");
 770         }
 771 }
 772
 773 /* Disable downlink interrupts */
 774 static void disable_transmit_dl(enum port_type port, struct nozomi *dc)
 775 {
 776         static const u16 mask[] =
 777                 {~MDM_DL, ~DIAG_DL, ~APP1_DL, ~APP2_DL, ~CTRL_DL};
 778
 779         if (port < NOZOMI_MAX_PORTS) {
 780                 dc->last_ier &= mask[port];
 781                 writew(dc->last_ier, dc->reg_ier);
 782         } else {
 783                 dev_err(&dc->pdev->dev, "Called with wrong port?\n");
 784         }
 785 }
 786
 787 /*
 788  * Return 1 - send buffer to card and ack.
 789  * Return 0 - don't ack, don't send buffer to card.
 790  */
 791 static int send_data(enum port_type index, const struct nozomi *dc)
 792 {
 793         u32 size = 0;
 794         const struct port *port = &dc->port[index];
 795         const u8 toggle = port->toggle_ul;
 796         void __iomem *addr = port->ul_addr[toggle];
 797         const u32 ul_size = port->ul_size[toggle];
 798         struct tty_struct *tty = port->tty;
 799
 800         /* Get data from tty and place in buf for now */
 801         size = __kfifo_get(port->fifo_ul, dc->send_buf,
 802                            ul_size < SEND_BUF_MAX ? ul_size : SEND_BUF_MAX);
 803
 804         if (size == 0) {
 805                 DBG4("No more data to send, disable link:");
 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         return 1;
 819 }
 820
 821 /* If all data has been read, return 1, else 0 */
 822 static int receive_data(enum port_type index, struct nozomi *dc)
 823 {
 824         u8 buf[RECEIVE_BUF_MAX] = { 0 };
 825         int size;
 826         u32 offset = 4;
 827         struct port *port = &dc->port[index];
 828         void __iomem *addr = port->dl_addr[port->toggle_dl];
 829         struct tty_struct *tty = port->tty;
 830         int i;
 831
 832         if (unlikely(!tty)) {
 833                 DBG1("tty not open for port: %d?", index);
 834                 return 1;
 835         }
 836
 837         read_mem32((u32 *) &size, addr, 4);
 838         /*  DBG1( "%d bytes port: %d", size, index); */
 839
 840         if (test_bit(TTY_THROTTLED, &tty->flags)) {
 841                 DBG1("No room in tty, don't read data, don't ack interrupt, "
 842                         "disable interrupt");
 843
 844                 /* disable interrupt in downlink... */
 845                 disable_transmit_dl(index, dc);
 846                 return 0;
 847         }
 848
 849         if (unlikely(size == 0)) {
 850                 dev_err(&dc->pdev->dev, "size == 0?\n");
 851                 return 1;
 852         }
 853
 854         tty_buffer_request_room(tty, size);
 855
 856         while (size > 0) {
 857                 read_mem32((u32 *) buf, addr + offset, RECEIVE_BUF_MAX);
 858
 859                 if (size == 1) {
 860                         tty_insert_flip_char(tty, buf[0], TTY_NORMAL);
 861                         size = 0;
 862                 } else if (size < RECEIVE_BUF_MAX) {
 863                         size -= tty_insert_flip_string(tty, (char *) buf, size);
 864                 } else {
 865                         i = tty_insert_flip_string(tty, \
 866                                                 (char *) buf, RECEIVE_BUF_MAX);
 867                         size -= i;
 868                         offset += i;
 869                 }
 870         }
 871
 872         set_bit(index, &dc->flip);
 873
 874         return 1;
 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                 if (test_and_clear_bit(a, &dc->flip))
1281                         tty_flip_buffer_push(dc->port[a].tty);
1282         return IRQ_HANDLED;
1283 none:
1284         spin_unlock(&dc->spin_mutex);
1285         return IRQ_NONE;
1286 }
1287
1288 static void nozomi_get_card_type(struct nozomi *dc)
1289 {
1290         int i;
1291         u32 size = 0;
1292
1293         for (i = 0; i < 6; i++)
1294                 size += pci_resource_len(dc->pdev, i);
1295
1296         /* Assume card type F32_8 if no match */
1297         dc->card_type = size == 2048 ? F32_2 : F32_8;
1298
1299         dev_info(&dc->pdev->dev, "Card type is: %d\n", dc->card_type);
1300 }
1301
1302 static void nozomi_setup_private_data(struct nozomi *dc)
1303 {
1304         void __iomem *offset = dc->base_addr + dc->card_type / 2;
1305         unsigned int i;
1306
1307         dc->reg_fcr = (void __iomem *)(offset + R_FCR);
1308         dc->reg_iir = (void __iomem *)(offset + R_IIR);
1309         dc->reg_ier = (void __iomem *)(offset + R_IER);
1310         dc->last_ier = 0;
1311         dc->flip = 0;
1312
1313         dc->port[PORT_MDM].token_dl = MDM_DL;
1314         dc->port[PORT_DIAG].token_dl = DIAG_DL;
1315         dc->port[PORT_APP1].token_dl = APP1_DL;
1316         dc->port[PORT_APP2].token_dl = APP2_DL;
1317
1318         for (i = 0; i < MAX_PORT; i++)
1319                 init_waitqueue_head(&dc->port[i].tty_wait);
1320 }
1321
1322 static ssize_t card_type_show(struct device *dev, struct device_attribute *attr,
1323                           char *buf)
1324 {
1325         const struct nozomi *dc = pci_get_drvdata(to_pci_dev(dev));
1326
1327         return sprintf(buf, "%d\n", dc->card_type);
1328 }
1329 static DEVICE_ATTR(card_type, S_IRUGO, card_type_show, NULL);
1330
1331 static ssize_t open_ttys_show(struct device *dev, struct device_attribute *attr,
1332                           char *buf)
1333 {
1334         const struct nozomi *dc = pci_get_drvdata(to_pci_dev(dev));
1335
1336         return sprintf(buf, "%u\n", dc->open_ttys);
1337 }
1338 static DEVICE_ATTR(open_ttys, S_IRUGO, open_ttys_show, NULL);
1339
1340 static void make_sysfs_files(struct nozomi *dc)
1341 {
1342         if (device_create_file(&dc->pdev->dev, &dev_attr_card_type))
1343                 dev_err(&dc->pdev->dev,
1344                         "Could not create sysfs file for card_type\n");
1345         if (device_create_file(&dc->pdev->dev, &dev_attr_open_ttys))
1346                 dev_err(&dc->pdev->dev,
1347                         "Could not create sysfs file for open_ttys\n");
1348 }
1349
1350 static void remove_sysfs_files(struct nozomi *dc)
1351 {
1352         device_remove_file(&dc->pdev->dev, &dev_attr_card_type);
1353         device_remove_file(&dc->pdev->dev, &dev_attr_open_ttys);
1354 }
1355
1356 /* Allocate memory for one device */
1357 static int __devinit nozomi_card_init(struct pci_dev *pdev,
1358                                       const struct pci_device_id *ent)
1359 {
1360         resource_size_t start;
1361         int ret;
1362         struct nozomi *dc = NULL;
1363         int ndev_idx;
1364         int i;
1365
1366         dev_dbg(&pdev->dev, "Init, new card found\n");
1367
1368         for (ndev_idx = 0; ndev_idx < ARRAY_SIZE(ndevs); ndev_idx++)
1369                 if (!ndevs[ndev_idx])
1370                         break;
1371
1372         if (ndev_idx >= ARRAY_SIZE(ndevs)) {
1373                 dev_err(&pdev->dev, "no free tty range for this card left\n");
1374                 ret = -EIO;
1375                 goto err;
1376         }
1377
1378         dc = kzalloc(sizeof(struct nozomi), GFP_KERNEL);
1379         if (unlikely(!dc)) {
1380                 dev_err(&pdev->dev, "Could not allocate memory\n");
1381                 ret = -ENOMEM;
1382                 goto err_free;
1383         }
1384
1385         dc->pdev = pdev;
1386
1387         ret = pci_enable_device(dc->pdev);
1388         if (ret) {
1389                 dev_err(&pdev->dev, "Failed to enable PCI Device\n");
1390                 goto err_free;
1391         }
1392
1393         ret = pci_request_regions(dc->pdev, NOZOMI_NAME);
1394         if (ret) {
1395                 dev_err(&pdev->dev, "I/O address 0x%04x already in use\n",
1396                         (int) /* nozomi_private.io_addr */ 0);
1397                 goto err_disable_device;
1398         }
1399
1400         start = pci_resource_start(dc->pdev, 0);
1401         if (start == 0) {
1402                 dev_err(&pdev->dev, "No I/O address for card detected\n");
1403                 ret = -ENODEV;
1404                 goto err_rel_regs;
1405         }
1406
1407         /* Find out what card type it is */
1408         nozomi_get_card_type(dc);
1409
1410         dc->base_addr = ioremap(start, dc->card_type);
1411         if (!dc->base_addr) {
1412                 dev_err(&pdev->dev, "Unable to map card MMIO\n");
1413                 ret = -ENODEV;
1414                 goto err_rel_regs;
1415         }
1416
1417         dc->send_buf = kmalloc(SEND_BUF_MAX, GFP_KERNEL);
1418         if (!dc->send_buf) {
1419                 dev_err(&pdev->dev, "Could not allocate send buffer?\n");
1420                 ret = -ENOMEM;
1421                 goto err_free_sbuf;
1422         }
1423
1424         spin_lock_init(&dc->spin_mutex);
1425
1426         nozomi_setup_private_data(dc);
1427
1428         /* Disable all interrupts */
1429         dc->last_ier = 0;
1430         writew(dc->last_ier, dc->reg_ier);
1431
1432         ret = request_irq(pdev->irq, &interrupt_handler, IRQF_SHARED,
1433                         NOZOMI_NAME, dc);
1434         if (unlikely(ret)) {
1435                 dev_err(&pdev->dev, "can't request irq %d\n", pdev->irq);
1436                 goto err_free_sbuf;
1437         }
1438
1439         DBG1("base_addr: %p", dc->base_addr);
1440
1441         make_sysfs_files(dc);
1442
1443         dc->index_start = ndev_idx * MAX_PORT;
1444         ndevs[ndev_idx] = dc;
1445
1446         pci_set_drvdata(pdev, dc);
1447
1448         /* Enable RESET interrupt */
1449         dc->last_ier = RESET;
1450         iowrite16(dc->last_ier, dc->reg_ier);
1451
1452         dc->state = NOZOMI_STATE_ENABLED;
1453
1454         for (i = 0; i < MAX_PORT; i++) {
1455                 mutex_init(&dc->port[i].tty_sem);
1456                 dc->port[i].tty_open_count = 0;
1457                 dc->port[i].tty = NULL;
1458                 tty_register_device(ntty_driver, dc->index_start + i,
1459                                                         &pdev->dev);
1460         }
1461
1462         return 0;
1463
1464 err_free_sbuf:
1465         kfree(dc->send_buf);
1466         iounmap(dc->base_addr);
1467 err_rel_regs:
1468         pci_release_regions(pdev);
1469 err_disable_device:
1470         pci_disable_device(pdev);
1471 err_free:
1472         kfree(dc);
1473 err:
1474         return ret;
1475 }
1476
1477 static void __devexit tty_exit(struct nozomi *dc)
1478 {
1479         unsigned int i;
1480
1481         DBG1(" ");
1482
1483         flush_scheduled_work();
1484
1485         for (i = 0; i < MAX_PORT; ++i)
1486                 if (dc->port[i].tty && \
1487                                 list_empty(&dc->port[i].tty->hangup_work.entry))
1488                         tty_hangup(dc->port[i].tty);
1489
1490         while (dc->open_ttys)
1491                 msleep(1);
1492
1493         for (i = dc->index_start; i < dc->index_start + MAX_PORT; ++i)
1494                 tty_unregister_device(ntty_driver, i);
1495 }
1496
1497 /* Deallocate memory for one device */
1498 static void __devexit nozomi_card_exit(struct pci_dev *pdev)
1499 {
1500         int i;
1501         struct ctrl_ul ctrl;
1502         struct nozomi *dc = pci_get_drvdata(pdev);
1503
1504         /* Disable all interrupts */
1505         dc->last_ier = 0;
1506         writew(dc->last_ier, dc->reg_ier);
1507
1508         tty_exit(dc);
1509
1510         /* Send 0x0001, command card to resend the reset token.  */
1511         /* This is to get the reset when the module is reloaded. */
1512         ctrl.port = 0x00;
1513         ctrl.reserved = 0;
1514         ctrl.RTS = 0;
1515         ctrl.DTR = 1;
1516         DBG1("sending flow control 0x%04X", *((u16 *)&ctrl));
1517
1518         /* Setup dc->reg addresses to we can use defines here */
1519         write_mem32(dc->port[PORT_CTRL].ul_addr[0], (u32 *)&ctrl, 2);
1520         writew(CTRL_UL, dc->reg_fcr);   /* push the token to the card. */
1521
1522         remove_sysfs_files(dc);
1523
1524         free_irq(pdev->irq, dc);
1525
1526         for (i = 0; i < MAX_PORT; i++)
1527                 if (dc->port[i].fifo_ul)
1528                         kfifo_free(dc->port[i].fifo_ul);
1529
1530         kfree(dc->send_buf);
1531
1532         iounmap(dc->base_addr);
1533
1534         pci_release_regions(pdev);
1535
1536         pci_disable_device(pdev);
1537
1538         ndevs[dc->index_start / MAX_PORT] = NULL;
1539
1540         kfree(dc);
1541 }
1542
1543 static void set_rts(const struct tty_struct *tty, int rts)
1544 {
1545         struct port *port = get_port_by_tty(tty);
1546
1547         port->ctrl_ul.RTS = rts;
1548         port->update_flow_control = 1;
1549         enable_transmit_ul(PORT_CTRL, get_dc_by_tty(tty));
1550 }
1551
1552 static void set_dtr(const struct tty_struct *tty, int dtr)
1553 {
1554         struct port *port = get_port_by_tty(tty);
1555
1556         DBG1("SETTING DTR index: %d, dtr: %d", tty->index, dtr);
1557
1558         port->ctrl_ul.DTR = dtr;
1559         port->update_flow_control = 1;
1560         enable_transmit_ul(PORT_CTRL, get_dc_by_tty(tty));
1561 }
1562
1563 /*
1564  * ----------------------------------------------------------------------------
1565  * TTY code
1566  * ----------------------------------------------------------------------------
1567  */
1568
1569 /* Called when the userspace process opens the tty, /dev/noz*.  */
1570 static int ntty_open(struct tty_struct *tty, struct file *file)
1571 {
1572         struct port *port = get_port_by_tty(tty);
1573         struct nozomi *dc = get_dc_by_tty(tty);
1574         unsigned long flags;
1575
1576         if (!port || !dc || dc->state != NOZOMI_STATE_READY)
1577                 return -ENODEV;
1578
1579         if (mutex_lock_interruptible(&port->tty_sem))
1580                 return -ERESTARTSYS;
1581
1582         port->tty_open_count++;
1583         dc->open_ttys++;
1584
1585         /* Enable interrupt downlink for channel */
1586         if (port->tty_open_count == 1) {
1587                 tty->low_latency = 1;
1588                 tty->driver_data = port;
1589                 port->tty = tty;
1590                 DBG1("open: %d", port->token_dl);
1591                 spin_lock_irqsave(&dc->spin_mutex, flags);
1592                 dc->last_ier = dc->last_ier | port->token_dl;
1593                 writew(dc->last_ier, dc->reg_ier);
1594                 spin_unlock_irqrestore(&dc->spin_mutex, flags);
1595         }
1596
1597         mutex_unlock(&port->tty_sem);
1598
1599         return 0;
1600 }
1601
1602 /* Called when the userspace process close the tty, /dev/noz*. */
1603 static void ntty_close(struct tty_struct *tty, struct file *file)
1604 {
1605         struct nozomi *dc = get_dc_by_tty(tty);
1606         struct port *port = tty->driver_data;
1607         unsigned long flags;
1608
1609         if (!dc || !port)
1610                 return;
1611
1612         if (mutex_lock_interruptible(&port->tty_sem))
1613                 return;
1614
1615         if (!port->tty_open_count)
1616                 goto exit;
1617
1618         dc->open_ttys--;
1619         port->tty_open_count--;
1620
1621         if (port->tty_open_count == 0) {
1622                 DBG1("close: %d", port->token_dl);
1623                 spin_lock_irqsave(&dc->spin_mutex, flags);
1624                 dc->last_ier &= ~(port->token_dl);
1625                 writew(dc->last_ier, dc->reg_ier);
1626                 spin_unlock_irqrestore(&dc->spin_mutex, flags);
1627         }
1628
1629 exit:
1630         mutex_unlock(&port->tty_sem);
1631 }
1632
1633 /*
1634  * called when the userspace process writes to the tty (/dev/noz*).
1635  * Data is inserted into a fifo, which is then read and transfered to the modem.
1636  */
1637 static int ntty_write(struct tty_struct *tty, const unsigned char *buffer,
1638                       int count)
1639 {
1640         int rval = -EINVAL;
1641         struct nozomi *dc = get_dc_by_tty(tty);
1642         struct port *port = tty->driver_data;
1643         unsigned long flags;
1644
1645         /* DBG1( "WRITEx: %d, index = %d", count, index); */
1646
1647         if (!dc || !port)
1648                 return -ENODEV;
1649
1650         if (unlikely(!mutex_trylock(&port->tty_sem))) {
1651                 /*
1652                  * must test lock as tty layer wraps calls
1653                  * to this function with BKL
1654                  */
1655                 dev_err(&dc->pdev->dev, "Would have deadlocked - "
1656                         "return EAGAIN\n");
1657                 return -EAGAIN;
1658         }
1659
1660         if (unlikely(!port->tty_open_count)) {
1661                 DBG1(" ");
1662                 goto exit;
1663         }
1664
1665         rval = __kfifo_put(port->fifo_ul, (unsigned char *)buffer, count);
1666
1667         /* notify card */
1668         if (unlikely(dc == NULL)) {
1669                 DBG1("No device context?");
1670                 goto exit;
1671         }
1672
1673         spin_lock_irqsave(&dc->spin_mutex, flags);
1674         /* CTS is only valid on the modem channel */
1675         if (port == &(dc->port[PORT_MDM])) {
1676                 if (port->ctrl_dl.CTS) {
1677                         DBG4("Enable interrupt");
1678                         enable_transmit_ul(tty->index % MAX_PORT, dc);
1679                 } else {
1680                         dev_err(&dc->pdev->dev,
1681                                 "CTS not active on modem port?\n");
1682                 }
1683         } else {
1684                 enable_transmit_ul(tty->index % MAX_PORT, dc);
1685         }
1686         spin_unlock_irqrestore(&dc->spin_mutex, flags);
1687
1688 exit:
1689         mutex_unlock(&port->tty_sem);
1690         return rval;
1691 }
1692
1693 /*
1694  * Calculate how much is left in device
1695  * This method is called by the upper tty layer.
1696  *   #according to sources N_TTY.c it expects a value >= 0 and
1697  *    does not check for negative values.
1698  */
1699 static int ntty_write_room(struct tty_struct *tty)
1700 {
1701         struct port *port = tty->driver_data;
1702         int room = 0;
1703         const struct nozomi *dc = get_dc_by_tty(tty);
1704
1705         if (!dc || !port)
1706                 return 0;
1707         if (!mutex_trylock(&port->tty_sem))
1708                 return 0;
1709
1710         if (!port->tty_open_count)
1711                 goto exit;
1712
1713         room = port->fifo_ul->size - __kfifo_len(port->fifo_ul);
1714
1715 exit:
1716         mutex_unlock(&port->tty_sem);
1717         return room;
1718 }
1719
1720 /* Gets io control parameters */
1721 static int ntty_tiocmget(struct tty_struct *tty, struct file *file)
1722 {
1723         const struct port *port = tty->driver_data;
1724         const struct ctrl_dl *ctrl_dl = &port->ctrl_dl;
1725         const struct ctrl_ul *ctrl_ul = &port->ctrl_ul;
1726
1727         return  (ctrl_ul->RTS ? TIOCM_RTS : 0) |
1728                 (ctrl_ul->DTR ? TIOCM_DTR : 0) |
1729                 (ctrl_dl->DCD ? TIOCM_CAR : 0) |
1730                 (ctrl_dl->RI  ? TIOCM_RNG : 0) |
1731                 (ctrl_dl->DSR ? TIOCM_DSR : 0) |
1732                 (ctrl_dl->CTS ? TIOCM_CTS : 0);
1733 }
1734
1735 /* Sets io controls parameters */
1736 static int ntty_tiocmset(struct tty_struct *tty, struct file *file,
1737         unsigned int set, unsigned int clear)
1738 {
1739         struct nozomi *dc = get_dc_by_tty(tty);
1740         unsigned long flags;
1741
1742         spin_lock_irqsave(&dc->spin_mutex, flags);
1743         if (set & TIOCM_RTS)
1744                 set_rts(tty, 1);
1745         else if (clear & TIOCM_RTS)
1746                 set_rts(tty, 0);
1747
1748         if (set & TIOCM_DTR)
1749                 set_dtr(tty, 1);
1750         else if (clear & TIOCM_DTR)
1751                 set_dtr(tty, 0);
1752         spin_unlock_irqrestore(&dc->spin_mutex, flags);
1753
1754         return 0;
1755 }
1756
1757 static int ntty_cflags_changed(struct port *port, unsigned long flags,
1758                 struct async_icount *cprev)
1759 {
1760         const struct async_icount cnow = port->tty_icount;
1761         int ret;
1762
1763         ret =   ((flags & TIOCM_RNG) && (cnow.rng != cprev->rng)) ||
1764                 ((flags & TIOCM_DSR) && (cnow.dsr != cprev->dsr)) ||
1765                 ((flags & TIOCM_CD)  && (cnow.dcd != cprev->dcd)) ||
1766                 ((flags & TIOCM_CTS) && (cnow.cts != cprev->cts));
1767
1768         *cprev = cnow;
1769
1770         return ret;
1771 }
1772
1773 static int ntty_ioctl_tiocgicount(struct port *port, void __user *argp)
1774 {
1775         const struct async_icount cnow = port->tty_icount;
1776         struct serial_icounter_struct icount;
1777
1778         icount.cts = cnow.cts;
1779         icount.dsr = cnow.dsr;
1780         icount.rng = cnow.rng;
1781         icount.dcd = cnow.dcd;
1782         icount.rx = cnow.rx;
1783         icount.tx = cnow.tx;
1784         icount.frame = cnow.frame;
1785         icount.overrun = cnow.overrun;
1786         icount.parity = cnow.parity;
1787         icount.brk = cnow.brk;
1788         icount.buf_overrun = cnow.buf_overrun;
1789
1790         return copy_to_user(argp, &icount, sizeof(icount)) ? -EFAULT : 0;
1791 }
1792
1793 static int ntty_ioctl(struct tty_struct *tty, struct file *file,
1794                       unsigned int cmd, unsigned long arg)
1795 {
1796         struct port *port = tty->driver_data;
1797         void __user *argp = (void __user *)arg;
1798         int rval = -ENOIOCTLCMD;
1799
1800         DBG1("******** IOCTL, cmd: %d", cmd);
1801
1802         switch (cmd) {
1803         case TIOCMIWAIT: {
1804                 struct async_icount cprev = port->tty_icount;
1805
1806                 rval = wait_event_interruptible(port->tty_wait,
1807                                 ntty_cflags_changed(port, arg, &cprev));
1808                 break;
1809         } case TIOCGICOUNT:
1810                 rval = ntty_ioctl_tiocgicount(port, argp);
1811                 break;
1812         default:
1813                 DBG1("ERR: 0x%08X, %d", cmd, cmd);
1814                 break;
1815         };
1816
1817         return rval;
1818 }
1819
1820 /*
1821  * Called by the upper tty layer when tty buffers are ready
1822  * to receive data again after a call to throttle.
1823  */
1824 static void ntty_unthrottle(struct tty_struct *tty)
1825 {
1826         struct nozomi *dc = get_dc_by_tty(tty);
1827         unsigned long flags;
1828
1829         DBG1("UNTHROTTLE");
1830         spin_lock_irqsave(&dc->spin_mutex, flags);
1831         enable_transmit_dl(tty->index % MAX_PORT, dc);
1832         set_rts(tty, 1);
1833
1834         spin_unlock_irqrestore(&dc->spin_mutex, flags);
1835 }
1836
1837 /*
1838  * Called by the upper tty layer when the tty buffers are almost full.
1839  * The driver should stop send more data.
1840  */
1841 static void ntty_throttle(struct tty_struct *tty)
1842 {
1843         struct nozomi *dc = get_dc_by_tty(tty);
1844         unsigned long flags;
1845
1846         DBG1("THROTTLE");
1847         spin_lock_irqsave(&dc->spin_mutex, flags);
1848         set_rts(tty, 0);
1849         spin_unlock_irqrestore(&dc->spin_mutex, flags);
1850 }
1851
1852 /* just to discard single character writes */
1853 static void ntty_put_char(struct tty_struct *tty, unsigned char c)
1854 {
1855         /*
1856          * card does not react correct when we write single chars
1857          * to the card, so we discard them
1858          */
1859         DBG2("PUT CHAR Function: %c", c);
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->tty_open_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         .put_char = ntty_put_char,
1896         .tiocmget = ntty_tiocmget,
1897         .tiocmset = ntty_tiocmset,
1898 };
1899
1900 /* Module initialization */
1901 static struct pci_driver nozomi_driver = {
1902         .name = NOZOMI_NAME,
1903         .id_table = nozomi_pci_tbl,
1904         .probe = nozomi_card_init,
1905         .remove = __devexit_p(nozomi_card_exit),
1906 };
1907
1908 static __init int nozomi_init(void)
1909 {
1910         int ret;
1911
1912         printk(KERN_INFO "Initializing %s\n", VERSION_STRING);
1913
1914         ntty_driver = alloc_tty_driver(NTTY_TTY_MAXMINORS);
1915         if (!ntty_driver)
1916                 return -ENOMEM;
1917
1918         ntty_driver->owner = THIS_MODULE;
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);