SAFE public projects git trees. - safe/jmp/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/sched.h>
  52 #include <linux/serial.h>
  53 #include <linux/interrupt.h>
  54 #include <linux/kmod.h>
  55 #include <linux/init.h>
  56 #include <linux/kfifo.h>
  57 #include <linux/uaccess.h>
  58 #include <linux/slab.h>
  59 #include <asm/byteorder.h>
  60
  61 #include <linux/delay.h>
  62
  63
  64 #define VERSION_STRING DRIVER_DESC " 2.1d (build date: " \
  65                                         __DATE__ " " __TIME__ ")"
  66
  67 /*    Macros definitions */
  68
  69 /* Default debug printout level */
  70 #define NOZOMI_DEBUG_LEVEL 0x00
  71
  72 #define P_BUF_SIZE 128
  73 #define NFO(_err_flag_, args...)                                \
  74 do {                                                            \
  75         char tmp[P_BUF_SIZE];                                   \
  76         snprintf(tmp, sizeof(tmp), ##args);                     \
  77         printk(_err_flag_ "[%d] %s(): %s\n", __LINE__,          \
  78                 __func__, tmp);                         \
  79 } while (0)
  80
  81 #define DBG1(args...) D_(0x01, ##args)
  82 #define DBG2(args...) D_(0x02, ##args)
  83 #define DBG3(args...) D_(0x04, ##args)
  84 #define DBG4(args...) D_(0x08, ##args)
  85 #define DBG5(args...) D_(0x10, ##args)
  86 #define DBG6(args...) D_(0x20, ##args)
  87 #define DBG7(args...) D_(0x40, ##args)
  88 #define DBG8(args...) D_(0x80, ##args)
  89
  90 #ifdef DEBUG
  91 /* Do we need this settable at runtime? */
  92 static int debug = NOZOMI_DEBUG_LEVEL;
  93
  94 #define D(lvl, args...)  do \
  95                         {if (lvl & debug) NFO(KERN_DEBUG, ##args); } \
  96                         while (0)
  97 #define D_(lvl, args...) D(lvl, ##args)
  98
  99 /* These printouts are always printed */
 100
 101 #else
 102 static int debug;
 103 #define D_(lvl, args...)
 104 #endif
 105
 106 /* TODO: rewrite to optimize macros... */
 107
 108 #define TMP_BUF_MAX 256
 109
 110 #define DUMP(buf__,len__) \
 111   do {  \
 112     char tbuf[TMP_BUF_MAX] = {0};\
 113     if (len__ > 1) {\
 114         snprintf(tbuf, len__ > TMP_BUF_MAX ? TMP_BUF_MAX : len__, "%s", buf__);\
 115         if (tbuf[len__-2] == '\r') {\
 116                 tbuf[len__-2] = 'r';\
 117         } \
 118         DBG1("SENDING: '%s' (%d+n)", tbuf, len__);\
 119     } else {\
 120         DBG1("SENDING: '%s' (%d)", tbuf, len__);\
 121     } \
 122 } while (0)
 123
 124 /*    Defines */
 125 #define NOZOMI_NAME             "nozomi"
 126 #define NOZOMI_NAME_TTY         "nozomi_tty"
 127 #define DRIVER_DESC             "Nozomi driver"
 128
 129 #define NTTY_TTY_MAXMINORS      256
 130 #define NTTY_FIFO_BUFFER_SIZE   8192
 131
 132 /* Must be power of 2 */
 133 #define FIFO_BUFFER_SIZE_UL     8192
 134
 135 /* Size of tmp send buffer to card */
 136 #define SEND_BUF_MAX            1024
 137 #define RECEIVE_BUF_MAX         4
 138
 139
 140 #define R_IIR           0x0000  /* Interrupt Identity Register */
 141 #define R_FCR           0x0000  /* Flow Control Register */
 142 #define R_IER           0x0004  /* Interrupt Enable Register */
 143
 144 #define CONFIG_MAGIC    0xEFEFFEFE
 145 #define TOGGLE_VALID    0x0000
 146
 147 /* Definition of interrupt tokens */
 148 #define MDM_DL1         0x0001
 149 #define MDM_UL1         0x0002
 150 #define MDM_DL2         0x0004
 151 #define MDM_UL2         0x0008
 152 #define DIAG_DL1        0x0010
 153 #define DIAG_DL2        0x0020
 154 #define DIAG_UL         0x0040
 155 #define APP1_DL         0x0080
 156 #define APP1_UL         0x0100
 157 #define APP2_DL         0x0200
 158 #define APP2_UL         0x0400
 159 #define CTRL_DL         0x0800
 160 #define CTRL_UL         0x1000
 161 #define RESET           0x8000
 162
 163 #define MDM_DL          (MDM_DL1  | MDM_DL2)
 164 #define MDM_UL          (MDM_UL1  | MDM_UL2)
 165 #define DIAG_DL         (DIAG_DL1 | DIAG_DL2)
 166
 167 /* modem signal definition */
 168 #define CTRL_DSR        0x0001
 169 #define CTRL_DCD        0x0002
 170 #define CTRL_RI         0x0004
 171 #define CTRL_CTS        0x0008
 172
 173 #define CTRL_DTR        0x0001
 174 #define CTRL_RTS        0x0002
 175
 176 #define MAX_PORT                4
 177 #define NOZOMI_MAX_PORTS        5
 178 #define NOZOMI_MAX_CARDS        (NTTY_TTY_MAXMINORS / MAX_PORT)
 179
 180 /*    Type definitions */
 181
 182 /*
 183  * There are two types of nozomi cards,
 184  * one with 2048 memory and with 8192 memory
 185  */
 186 enum card_type {
 187         F32_2 = 2048,   /* 512 bytes downlink + uplink * 2 -> 2048 */
 188         F32_8 = 8192,   /* 3072 bytes downl. + 1024 bytes uplink * 2 -> 8192 */
 189 };
 190
 191 /* Initialization states a card can be in */
 192 enum card_state {
 193         NOZOMI_STATE_UKNOWN     = 0,
 194         NOZOMI_STATE_ENABLED    = 1,    /* pci device enabled */
 195         NOZOMI_STATE_ALLOCATED  = 2,    /* config setup done */
 196         NOZOMI_STATE_READY      = 3,    /* flowcontrols received */
 197 };
 198
 199 /* Two different toggle channels exist */
 200 enum channel_type {
 201         CH_A = 0,
 202         CH_B = 1,
 203 };
 204
 205 /* Port definition for the card regarding flow control */
 206 enum ctrl_port_type {
 207         CTRL_CMD        = 0,
 208         CTRL_MDM        = 1,
 209         CTRL_DIAG       = 2,
 210         CTRL_APP1       = 3,
 211         CTRL_APP2       = 4,
 212         CTRL_ERROR      = -1,
 213 };
 214
 215 /* Ports that the nozomi has */
 216 enum port_type {
 217         PORT_MDM        = 0,
 218         PORT_DIAG       = 1,
 219         PORT_APP1       = 2,
 220         PORT_APP2       = 3,
 221         PORT_CTRL       = 4,
 222         PORT_ERROR      = -1,
 223 };
 224
 225 #ifdef __BIG_ENDIAN
 226 /* Big endian */
 227
 228 struct toggles {
 229         unsigned int enabled:5; /*
 230                                  * Toggle fields are valid if enabled is 0,
 231                                  * else A-channels must always be used.
 232                                  */
 233         unsigned int diag_dl:1;
 234         unsigned int mdm_dl:1;
 235         unsigned int mdm_ul:1;
 236 } __attribute__ ((packed));
 237
 238 /* Configuration table to read at startup of card */
 239 /* Is for now only needed during initialization phase */
 240 struct config_table {
 241         u32 signature;
 242         u16 product_information;
 243         u16 version;
 244         u8 pad3[3];
 245         struct toggles toggle;
 246         u8 pad1[4];
 247         u16 dl_mdm_len1;        /*
 248                                  * If this is 64, it can hold
 249                                  * 60 bytes + 4 that is length field
 250                                  */
 251         u16 dl_start;
 252
 253         u16 dl_diag_len1;
 254         u16 dl_mdm_len2;        /*
 255                                  * If this is 64, it can hold
 256                                  * 60 bytes + 4 that is length field
 257                                  */
 258         u16 dl_app1_len;
 259
 260         u16 dl_diag_len2;
 261         u16 dl_ctrl_len;
 262         u16 dl_app2_len;
 263         u8 pad2[16];
 264         u16 ul_mdm_len1;
 265         u16 ul_start;
 266         u16 ul_diag_len;
 267         u16 ul_mdm_len2;
 268         u16 ul_app1_len;
 269         u16 ul_app2_len;
 270         u16 ul_ctrl_len;
 271 } __attribute__ ((packed));
 272
 273 /* This stores all control downlink flags */
 274 struct ctrl_dl {
 275         u8 port;
 276         unsigned int reserved:4;
 277         unsigned int CTS:1;
 278         unsigned int RI:1;
 279         unsigned int DCD:1;
 280         unsigned int DSR:1;
 281 } __attribute__ ((packed));
 282
 283 /* This stores all control uplink flags */
 284 struct ctrl_ul {
 285         u8 port;
 286         unsigned int reserved:6;
 287         unsigned int RTS:1;
 288         unsigned int DTR:1;
 289 } __attribute__ ((packed));
 290
 291 #else
 292 /* Little endian */
 293
 294 /* This represents the toggle information */
 295 struct toggles {
 296         unsigned int mdm_ul:1;
 297         unsigned int mdm_dl:1;
 298         unsigned int diag_dl:1;
 299         unsigned int enabled:5; /*
 300                                  * Toggle fields are valid if enabled is 0,
 301                                  * else A-channels must always be used.
 302                                  */
 303 } __attribute__ ((packed));
 304
 305 /* Configuration table to read at startup of card */
 306 struct config_table {
 307         u32 signature;
 308         u16 version;
 309         u16 product_information;
 310         struct toggles toggle;
 311         u8 pad1[7];
 312         u16 dl_start;
 313         u16 dl_mdm_len1;        /*
 314                                  * If this is 64, it can hold
 315                                  * 60 bytes + 4 that is length field
 316                                  */
 317         u16 dl_mdm_len2;
 318         u16 dl_diag_len1;
 319         u16 dl_diag_len2;
 320         u16 dl_app1_len;
 321         u16 dl_app2_len;
 322         u16 dl_ctrl_len;
 323         u8 pad2[16];
 324         u16 ul_start;
 325         u16 ul_mdm_len2;
 326         u16 ul_mdm_len1;
 327         u16 ul_diag_len;
 328         u16 ul_app1_len;
 329         u16 ul_app2_len;
 330         u16 ul_ctrl_len;
 331 } __attribute__ ((packed));
 332
 333 /* This stores all control downlink flags */
 334 struct ctrl_dl {
 335         unsigned int DSR:1;
 336         unsigned int DCD:1;
 337         unsigned int RI:1;
 338         unsigned int CTS:1;
 339         unsigned int reserverd:4;
 340         u8 port;
 341 } __attribute__ ((packed));
 342
 343 /* This stores all control uplink flags */
 344 struct ctrl_ul {
 345         unsigned int DTR:1;
 346         unsigned int RTS:1;
 347         unsigned int reserved:6;
 348         u8 port;
 349 } __attribute__ ((packed));
 350 #endif
 351
 352 /* This holds all information that is needed regarding a port */
 353 struct port {
 354         struct tty_port port;
 355         u8 update_flow_control;
 356         struct ctrl_ul ctrl_ul;
 357         struct ctrl_dl ctrl_dl;
 358         struct kfifo fifo_ul;
 359         void __iomem *dl_addr[2];
 360         u32 dl_size[2];
 361         u8 toggle_dl;
 362         void __iomem *ul_addr[2];
 363         u32 ul_size[2];
 364         u8 toggle_ul;
 365         u16 token_dl;
 366
 367         /* mutex to ensure one access patch to this port */
 368         struct mutex tty_sem;
 369         wait_queue_head_t tty_wait;
 370         struct async_icount tty_icount;
 371
 372         struct nozomi *dc;
 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(0x1931, 0x000c)},   /* Nozomi HSDPA */
 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 static const struct tty_port_operations noz_tty_port_ops;
 417
 418 /*
 419  * find card by tty_index
 420  */
 421 static inline struct nozomi *get_dc_by_tty(const struct tty_struct *tty)
 422 {
 423         return tty ? ndevs[tty->index / MAX_PORT] : NULL;
 424 }
 425
 426 static inline struct port *get_port_by_tty(const struct tty_struct *tty)
 427 {
 428         struct nozomi *ndev = get_dc_by_tty(tty);
 429         return ndev ? &ndev->port[tty->index % MAX_PORT] : NULL;
 430 }
 431
 432 /*
 433  * TODO:
 434  * -Optimize
 435  * -Rewrite cleaner
 436  */
 437
 438 static void read_mem32(u32 *buf, const void __iomem *mem_addr_start,
 439                         u32 size_bytes)
 440 {
 441         u32 i = 0;
 442         const u32 __iomem *ptr = mem_addr_start;
 443         u16 *buf16;
 444
 445         if (unlikely(!ptr || !buf))
 446                 goto out;
 447
 448         /* shortcut for extremely often used cases */
 449         switch (size_bytes) {
 450         case 2: /* 2 bytes */
 451                 buf16 = (u16 *) buf;
 452                 *buf16 = __le16_to_cpu(readw(ptr));
 453                 goto out;
 454                 break;
 455         case 4: /* 4 bytes */
 456                 *(buf) = __le32_to_cpu(readl(ptr));
 457                 goto out;
 458                 break;
 459         }
 460
 461         while (i < size_bytes) {
 462                 if (size_bytes - i == 2) {
 463                         /* Handle 2 bytes in the end */
 464                         buf16 = (u16 *) buf;
 465                         *(buf16) = __le16_to_cpu(readw(ptr));
 466                         i += 2;
 467                 } else {
 468                         /* Read 4 bytes */
 469                         *(buf) = __le32_to_cpu(readl(ptr));
 470                         i += 4;
 471                 }
 472                 buf++;
 473                 ptr++;
 474         }
 475 out:
 476         return;
 477 }
 478
 479 /*
 480  * TODO:
 481  * -Optimize
 482  * -Rewrite cleaner
 483  */
 484 static u32 write_mem32(void __iomem *mem_addr_start, const u32 *buf,
 485                         u32 size_bytes)
 486 {
 487         u32 i = 0;
 488         u32 __iomem *ptr = mem_addr_start;
 489         const u16 *buf16;
 490
 491         if (unlikely(!ptr || !buf))
 492                 return 0;
 493
 494         /* shortcut for extremely often used cases */
 495         switch (size_bytes) {
 496         case 2: /* 2 bytes */
 497                 buf16 = (const u16 *)buf;
 498                 writew(__cpu_to_le16(*buf16), ptr);
 499                 return 2;
 500                 break;
 501         case 1: /*
 502                  * also needs to write 4 bytes in this case
 503                  * so falling through..
 504                  */
 505         case 4: /* 4 bytes */
 506                 writel(__cpu_to_le32(*buf), ptr);
 507                 return 4;
 508                 break;
 509         }
 510
 511         while (i < size_bytes) {
 512                 if (size_bytes - i == 2) {
 513                         /* 2 bytes */
 514                         buf16 = (const u16 *)buf;
 515                         writew(__cpu_to_le16(*buf16), ptr);
 516                         i += 2;
 517                 } else {
 518                         /* 4 bytes */
 519                         writel(__cpu_to_le32(*buf), ptr);
 520                         i += 4;
 521                 }
 522                 buf++;
 523                 ptr++;
 524         }
 525         return i;
 526 }
 527
 528 /* Setup pointers to different channels and also setup buffer sizes. */
 529 static void setup_memory(struct nozomi *dc)
 530 {
 531         void __iomem *offset = dc->base_addr + dc->config_table.dl_start;
 532         /* The length reported is including the length field of 4 bytes,
 533          * hence subtract with 4.
 534          */
 535         const u16 buff_offset = 4;
 536
 537         /* Modem port dl configuration */
 538         dc->port[PORT_MDM].dl_addr[CH_A] = offset;
 539         dc->port[PORT_MDM].dl_addr[CH_B] =
 540                                 (offset += dc->config_table.dl_mdm_len1);
 541         dc->port[PORT_MDM].dl_size[CH_A] =
 542                                 dc->config_table.dl_mdm_len1 - buff_offset;
 543         dc->port[PORT_MDM].dl_size[CH_B] =
 544                                 dc->config_table.dl_mdm_len2 - buff_offset;
 545
 546         /* Diag port dl configuration */
 547         dc->port[PORT_DIAG].dl_addr[CH_A] =
 548                                 (offset += dc->config_table.dl_mdm_len2);
 549         dc->port[PORT_DIAG].dl_size[CH_A] =
 550                                 dc->config_table.dl_diag_len1 - buff_offset;
 551         dc->port[PORT_DIAG].dl_addr[CH_B] =
 552                                 (offset += dc->config_table.dl_diag_len1);
 553         dc->port[PORT_DIAG].dl_size[CH_B] =
 554                                 dc->config_table.dl_diag_len2 - buff_offset;
 555
 556         /* App1 port dl configuration */
 557         dc->port[PORT_APP1].dl_addr[CH_A] =
 558                                 (offset += dc->config_table.dl_diag_len2);
 559         dc->port[PORT_APP1].dl_size[CH_A] =
 560                                 dc->config_table.dl_app1_len - buff_offset;
 561
 562         /* App2 port dl configuration */
 563         dc->port[PORT_APP2].dl_addr[CH_A] =
 564                                 (offset += dc->config_table.dl_app1_len);
 565         dc->port[PORT_APP2].dl_size[CH_A] =
 566                                 dc->config_table.dl_app2_len - buff_offset;
 567
 568         /* Ctrl dl configuration */
 569         dc->port[PORT_CTRL].dl_addr[CH_A] =
 570                                 (offset += dc->config_table.dl_app2_len);
 571         dc->port[PORT_CTRL].dl_size[CH_A] =
 572                                 dc->config_table.dl_ctrl_len - buff_offset;
 573
 574         offset = dc->base_addr + dc->config_table.ul_start;
 575
 576         /* Modem Port ul configuration */
 577         dc->port[PORT_MDM].ul_addr[CH_A] = offset;
 578         dc->port[PORT_MDM].ul_size[CH_A] =
 579                                 dc->config_table.ul_mdm_len1 - buff_offset;
 580         dc->port[PORT_MDM].ul_addr[CH_B] =
 581                                 (offset += dc->config_table.ul_mdm_len1);
 582         dc->port[PORT_MDM].ul_size[CH_B] =
 583                                 dc->config_table.ul_mdm_len2 - buff_offset;
 584
 585         /* Diag port ul configuration */
 586         dc->port[PORT_DIAG].ul_addr[CH_A] =
 587                                 (offset += dc->config_table.ul_mdm_len2);
 588         dc->port[PORT_DIAG].ul_size[CH_A] =
 589                                 dc->config_table.ul_diag_len - buff_offset;
 590
 591         /* App1 port ul configuration */
 592         dc->port[PORT_APP1].ul_addr[CH_A] =
 593                                 (offset += dc->config_table.ul_diag_len);
 594         dc->port[PORT_APP1].ul_size[CH_A] =
 595                                 dc->config_table.ul_app1_len - buff_offset;
 596
 597         /* App2 port ul configuration */
 598         dc->port[PORT_APP2].ul_addr[CH_A] =
 599                                 (offset += dc->config_table.ul_app1_len);
 600         dc->port[PORT_APP2].ul_size[CH_A] =
 601                                 dc->config_table.ul_app2_len - buff_offset;
 602
 603         /* Ctrl ul configuration */
 604         dc->port[PORT_CTRL].ul_addr[CH_A] =
 605                                 (offset += dc->config_table.ul_app2_len);
 606         dc->port[PORT_CTRL].ul_size[CH_A] =
 607                                 dc->config_table.ul_ctrl_len - buff_offset;
 608 }
 609
 610 /* Dump config table under initalization phase */
 611 #ifdef DEBUG
 612 static void dump_table(const struct nozomi *dc)
 613 {
 614         DBG3("signature: 0x%08X", dc->config_table.signature);
 615         DBG3("version: 0x%04X", dc->config_table.version);
 616         DBG3("product_information: 0x%04X", \
 617                                 dc->config_table.product_information);
 618         DBG3("toggle enabled: %d", dc->config_table.toggle.enabled);
 619         DBG3("toggle up_mdm: %d", dc->config_table.toggle.mdm_ul);
 620         DBG3("toggle dl_mdm: %d", dc->config_table.toggle.mdm_dl);
 621         DBG3("toggle dl_dbg: %d", dc->config_table.toggle.diag_dl);
 622
 623         DBG3("dl_start: 0x%04X", dc->config_table.dl_start);
 624         DBG3("dl_mdm_len0: 0x%04X, %d", dc->config_table.dl_mdm_len1,
 625            dc->config_table.dl_mdm_len1);
 626         DBG3("dl_mdm_len1: 0x%04X, %d", dc->config_table.dl_mdm_len2,
 627            dc->config_table.dl_mdm_len2);
 628         DBG3("dl_diag_len0: 0x%04X, %d", dc->config_table.dl_diag_len1,
 629            dc->config_table.dl_diag_len1);
 630         DBG3("dl_diag_len1: 0x%04X, %d", dc->config_table.dl_diag_len2,
 631            dc->config_table.dl_diag_len2);
 632         DBG3("dl_app1_len: 0x%04X, %d", dc->config_table.dl_app1_len,
 633            dc->config_table.dl_app1_len);
 634         DBG3("dl_app2_len: 0x%04X, %d", dc->config_table.dl_app2_len,
 635            dc->config_table.dl_app2_len);
 636         DBG3("dl_ctrl_len: 0x%04X, %d", dc->config_table.dl_ctrl_len,
 637            dc->config_table.dl_ctrl_len);
 638         DBG3("ul_start: 0x%04X, %d", dc->config_table.ul_start,
 639            dc->config_table.ul_start);
 640         DBG3("ul_mdm_len[0]: 0x%04X, %d", dc->config_table.ul_mdm_len1,
 641            dc->config_table.ul_mdm_len1);
 642         DBG3("ul_mdm_len[1]: 0x%04X, %d", dc->config_table.ul_mdm_len2,
 643            dc->config_table.ul_mdm_len2);
 644         DBG3("ul_diag_len: 0x%04X, %d", dc->config_table.ul_diag_len,
 645            dc->config_table.ul_diag_len);
 646         DBG3("ul_app1_len: 0x%04X, %d", dc->config_table.ul_app1_len,
 647            dc->config_table.ul_app1_len);
 648         DBG3("ul_app2_len: 0x%04X, %d", dc->config_table.ul_app2_len,
 649            dc->config_table.ul_app2_len);
 650         DBG3("ul_ctrl_len: 0x%04X, %d", dc->config_table.ul_ctrl_len,
 651            dc->config_table.ul_ctrl_len);
 652 }
 653 #else
 654 static inline void dump_table(const struct nozomi *dc) { }
 655 #endif
 656
 657 /*
 658  * Read configuration table from card under intalization phase
 659  * Returns 1 if ok, else 0
 660  */
 661 static int nozomi_read_config_table(struct nozomi *dc)
 662 {
 663         read_mem32((u32 *) &dc->config_table, dc->base_addr + 0,
 664                                                 sizeof(struct config_table));
 665
 666         if (dc->config_table.signature != CONFIG_MAGIC) {
 667                 dev_err(&dc->pdev->dev, "ConfigTable Bad! 0x%08X != 0x%08X\n",
 668                         dc->config_table.signature, CONFIG_MAGIC);
 669                 return 0;
 670         }
 671
 672         if ((dc->config_table.version == 0)
 673             || (dc->config_table.toggle.enabled == TOGGLE_VALID)) {
 674                 int i;
 675                 DBG1("Second phase, configuring card");
 676
 677                 setup_memory(dc);
 678
 679                 dc->port[PORT_MDM].toggle_ul = dc->config_table.toggle.mdm_ul;
 680                 dc->port[PORT_MDM].toggle_dl = dc->config_table.toggle.mdm_dl;
 681                 dc->port[PORT_DIAG].toggle_dl = dc->config_table.toggle.diag_dl;
 682                 DBG1("toggle ports: MDM UL:%d MDM DL:%d, DIAG DL:%d",
 683                    dc->port[PORT_MDM].toggle_ul,
 684                    dc->port[PORT_MDM].toggle_dl, dc->port[PORT_DIAG].toggle_dl);
 685
 686                 dump_table(dc);
 687
 688                 for (i = PORT_MDM; i < MAX_PORT; i++) {
 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_out(&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, ret;
 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                 ret = 0;
 848                 goto put;
 849         }
 850
 851         if (unlikely(size == 0)) {
 852                 dev_err(&dc->pdev->dev, "size == 0?\n");
 853                 ret = 1;
 854                 goto put;
 855         }
 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         ret = 1;
 875 put:
 876         tty_kref_put(tty);
 877         return ret;
 878 }
 879
 880 /* Debug for interrupts */
 881 #ifdef DEBUG
 882 static char *interrupt2str(u16 interrupt)
 883 {
 884         static char buf[TMP_BUF_MAX];
 885         char *p = buf;
 886
 887         interrupt & MDM_DL1 ? p += snprintf(p, TMP_BUF_MAX, "MDM_DL1 ") : NULL;
 888         interrupt & MDM_DL2 ? p += snprintf(p, TMP_BUF_MAX - (p - buf),
 889                                         "MDM_DL2 ") : NULL;
 890
 891         interrupt & MDM_UL1 ? p += snprintf(p, TMP_BUF_MAX - (p - buf),
 892                                         "MDM_UL1 ") : NULL;
 893         interrupt & MDM_UL2 ? p += snprintf(p, TMP_BUF_MAX - (p - buf),
 894                                         "MDM_UL2 ") : NULL;
 895
 896         interrupt & DIAG_DL1 ? p += snprintf(p, TMP_BUF_MAX - (p - buf),
 897                                         "DIAG_DL1 ") : NULL;
 898         interrupt & DIAG_DL2 ? p += snprintf(p, TMP_BUF_MAX - (p - buf),
 899                                         "DIAG_DL2 ") : NULL;
 900
 901         interrupt & DIAG_UL ? p += snprintf(p, TMP_BUF_MAX - (p - buf),
 902                                         "DIAG_UL ") : NULL;
 903
 904         interrupt & APP1_DL ? p += snprintf(p, TMP_BUF_MAX - (p - buf),
 905                                         "APP1_DL ") : NULL;
 906         interrupt & APP2_DL ? p += snprintf(p, TMP_BUF_MAX - (p - buf),
 907                                         "APP2_DL ") : NULL;
 908
 909         interrupt & APP1_UL ? p += snprintf(p, TMP_BUF_MAX - (p - buf),
 910                                         "APP1_UL ") : NULL;
 911         interrupt & APP2_UL ? p += snprintf(p, TMP_BUF_MAX - (p - buf),
 912                                         "APP2_UL ") : NULL;
 913
 914         interrupt & CTRL_DL ? p += snprintf(p, TMP_BUF_MAX - (p - buf),
 915                                         "CTRL_DL ") : NULL;
 916         interrupt & CTRL_UL ? p += snprintf(p, TMP_BUF_MAX - (p - buf),
 917                                         "CTRL_UL ") : NULL;
 918
 919         interrupt & RESET ? p += snprintf(p, TMP_BUF_MAX - (p - buf),
 920                                         "RESET ") : NULL;
 921
 922         return buf;
 923 }
 924 #endif
 925
 926 /*
 927  * Receive flow control
 928  * Return 1 - If ok, else 0
 929  */
 930 static int receive_flow_control(struct nozomi *dc)
 931 {
 932         enum port_type port = PORT_MDM;
 933         struct ctrl_dl ctrl_dl;
 934         struct ctrl_dl old_ctrl;
 935         u16 enable_ier = 0;
 936
 937         read_mem32((u32 *) &ctrl_dl, dc->port[PORT_CTRL].dl_addr[CH_A], 2);
 938
 939         switch (ctrl_dl.port) {
 940         case CTRL_CMD:
 941                 DBG1("The Base Band sends this value as a response to a "
 942                         "request for IMSI detach sent over the control "
 943                         "channel uplink (see section 7.6.1).");
 944                 break;
 945         case CTRL_MDM:
 946                 port = PORT_MDM;
 947                 enable_ier = MDM_DL;
 948                 break;
 949         case CTRL_DIAG:
 950                 port = PORT_DIAG;
 951                 enable_ier = DIAG_DL;
 952                 break;
 953         case CTRL_APP1:
 954                 port = PORT_APP1;
 955                 enable_ier = APP1_DL;
 956                 break;
 957         case CTRL_APP2:
 958                 port = PORT_APP2;
 959                 enable_ier = APP2_DL;
 960                 if (dc->state == NOZOMI_STATE_ALLOCATED) {
 961                         /*
 962                          * After card initialization the flow control
 963                          * received for APP2 is always the last
 964                          */
 965                         dc->state = NOZOMI_STATE_READY;
 966                         dev_info(&dc->pdev->dev, "Device READY!\n");
 967                 }
 968                 break;
 969         default:
 970                 dev_err(&dc->pdev->dev,
 971                         "ERROR: flow control received for non-existing port\n");
 972                 return 0;
 973         };
 974
 975         DBG1("0x%04X->0x%04X", *((u16 *)&dc->port[port].ctrl_dl),
 976            *((u16 *)&ctrl_dl));
 977
 978         old_ctrl = dc->port[port].ctrl_dl;
 979         dc->port[port].ctrl_dl = ctrl_dl;
 980
 981         if (old_ctrl.CTS == 1 && ctrl_dl.CTS == 0) {
 982                 DBG1("Disable interrupt (0x%04X) on port: %d",
 983                         enable_ier, port);
 984                 disable_transmit_ul(port, dc);
 985
 986         } else if (old_ctrl.CTS == 0 && ctrl_dl.CTS == 1) {
 987
 988                 if (kfifo_len(&dc->port[port].fifo_ul)) {
 989                         DBG1("Enable interrupt (0x%04X) on port: %d",
 990                                 enable_ier, port);
 991                         DBG1("Data in buffer [%d], enable transmit! ",
 992                                 kfifo_len(&dc->port[port].fifo_ul));
 993                         enable_transmit_ul(port, dc);
 994                 } else {
 995                         DBG1("No data in buffer...");
 996                 }
 997         }
 998
 999         if (*(u16 *)&old_ctrl == *(u16 *)&ctrl_dl) {
1000                 DBG1(" No change in mctrl");
1001                 return 1;
1002         }
1003         /* Update statistics */
1004         if (old_ctrl.CTS != ctrl_dl.CTS)
1005                 dc->port[port].tty_icount.cts++;
1006         if (old_ctrl.DSR != ctrl_dl.DSR)
1007                 dc->port[port].tty_icount.dsr++;
1008         if (old_ctrl.RI != ctrl_dl.RI)
1009                 dc->port[port].tty_icount.rng++;
1010         if (old_ctrl.DCD != ctrl_dl.DCD)
1011                 dc->port[port].tty_icount.dcd++;
1012
1013         wake_up_interruptible(&dc->port[port].tty_wait);
1014
1015         DBG1("port: %d DCD(%d), CTS(%d), RI(%d), DSR(%d)",
1016            port,
1017            dc->port[port].tty_icount.dcd, dc->port[port].tty_icount.cts,
1018            dc->port[port].tty_icount.rng, dc->port[port].tty_icount.dsr);
1019
1020         return 1;
1021 }
1022
1023 static enum ctrl_port_type port2ctrl(enum port_type port,
1024                                         const struct nozomi *dc)
1025 {
1026         switch (port) {
1027         case PORT_MDM:
1028                 return CTRL_MDM;
1029         case PORT_DIAG:
1030                 return CTRL_DIAG;
1031         case PORT_APP1:
1032                 return CTRL_APP1;
1033         case PORT_APP2:
1034                 return CTRL_APP2;
1035         default:
1036                 dev_err(&dc->pdev->dev,
1037                         "ERROR: send flow control " \
1038                         "received for non-existing port\n");
1039         };
1040         return CTRL_ERROR;
1041 }
1042
1043 /*
1044  * Send flow control, can only update one channel at a time
1045  * Return 0 - If we have updated all flow control
1046  * Return 1 - If we need to update more flow control, ack current enable more
1047  */
1048 static int send_flow_control(struct nozomi *dc)
1049 {
1050         u32 i, more_flow_control_to_be_updated = 0;
1051         u16 *ctrl;
1052
1053         for (i = PORT_MDM; i < MAX_PORT; i++) {
1054                 if (dc->port[i].update_flow_control) {
1055                         if (more_flow_control_to_be_updated) {
1056                                 /* We have more flow control to be updated */
1057                                 return 1;
1058                         }
1059                         dc->port[i].ctrl_ul.port = port2ctrl(i, dc);
1060                         ctrl = (u16 *)&dc->port[i].ctrl_ul;
1061                         write_mem32(dc->port[PORT_CTRL].ul_addr[0], \
1062                                 (u32 *) ctrl, 2);
1063                         dc->port[i].update_flow_control = 0;
1064                         more_flow_control_to_be_updated = 1;
1065                 }
1066         }
1067         return 0;
1068 }
1069
1070 /*
1071  * Handle downlink data, ports that are handled are modem and diagnostics
1072  * Return 1 - ok
1073  * Return 0 - toggle fields are out of sync
1074  */
1075 static int handle_data_dl(struct nozomi *dc, enum port_type port, u8 *toggle,
1076                         u16 read_iir, u16 mask1, u16 mask2)
1077 {
1078         if (*toggle == 0 && read_iir & mask1) {
1079                 if (receive_data(port, dc)) {
1080                         writew(mask1, dc->reg_fcr);
1081                         *toggle = !(*toggle);
1082                 }
1083
1084                 if (read_iir & mask2) {
1085                         if (receive_data(port, dc)) {
1086                                 writew(mask2, dc->reg_fcr);
1087                                 *toggle = !(*toggle);
1088                         }
1089                 }
1090         } else if (*toggle == 1 && read_iir & mask2) {
1091                 if (receive_data(port, dc)) {
1092                         writew(mask2, dc->reg_fcr);
1093                         *toggle = !(*toggle);
1094                 }
1095
1096                 if (read_iir & mask1) {
1097                         if (receive_data(port, dc)) {
1098                                 writew(mask1, dc->reg_fcr);
1099                                 *toggle = !(*toggle);
1100                         }
1101                 }
1102         } else {
1103                 dev_err(&dc->pdev->dev, "port out of sync!, toggle:%d\n",
1104                         *toggle);
1105                 return 0;
1106         }
1107         return 1;
1108 }
1109
1110 /*
1111  * Handle uplink data, this is currently for the modem port
1112  * Return 1 - ok
1113  * Return 0 - toggle field are out of sync
1114  */
1115 static int handle_data_ul(struct nozomi *dc, enum port_type port, u16 read_iir)
1116 {
1117         u8 *toggle = &(dc->port[port].toggle_ul);
1118
1119         if (*toggle == 0 && read_iir & MDM_UL1) {
1120                 dc->last_ier &= ~MDM_UL;
1121                 writew(dc->last_ier, dc->reg_ier);
1122                 if (send_data(port, dc)) {
1123                         writew(MDM_UL1, dc->reg_fcr);
1124                         dc->last_ier = dc->last_ier | MDM_UL;
1125                         writew(dc->last_ier, dc->reg_ier);
1126                         *toggle = !*toggle;
1127                 }
1128
1129                 if (read_iir & MDM_UL2) {
1130                         dc->last_ier &= ~MDM_UL;
1131                         writew(dc->last_ier, dc->reg_ier);
1132                         if (send_data(port, dc)) {
1133                                 writew(MDM_UL2, dc->reg_fcr);
1134                                 dc->last_ier = dc->last_ier | MDM_UL;
1135                                 writew(dc->last_ier, dc->reg_ier);
1136                                 *toggle = !*toggle;
1137                         }
1138                 }
1139
1140         } else if (*toggle == 1 && read_iir & MDM_UL2) {
1141                 dc->last_ier &= ~MDM_UL;
1142                 writew(dc->last_ier, dc->reg_ier);
1143                 if (send_data(port, dc)) {
1144                         writew(MDM_UL2, dc->reg_fcr);
1145                         dc->last_ier = dc->last_ier | MDM_UL;
1146                         writew(dc->last_ier, dc->reg_ier);
1147                         *toggle = !*toggle;
1148                 }
1149
1150                 if (read_iir & MDM_UL1) {
1151                         dc->last_ier &= ~MDM_UL;
1152                         writew(dc->last_ier, dc->reg_ier);
1153                         if (send_data(port, dc)) {
1154                                 writew(MDM_UL1, dc->reg_fcr);
1155                                 dc->last_ier = dc->last_ier | MDM_UL;
1156                                 writew(dc->last_ier, dc->reg_ier);
1157                                 *toggle = !*toggle;
1158                         }
1159                 }
1160         } else {
1161                 writew(read_iir & MDM_UL, dc->reg_fcr);
1162                 dev_err(&dc->pdev->dev, "port out of sync!\n");
1163                 return 0;
1164         }
1165         return 1;
1166 }
1167
1168 static irqreturn_t interrupt_handler(int irq, void *dev_id)
1169 {
1170         struct nozomi *dc = dev_id;
1171         unsigned int a;
1172         u16 read_iir;
1173
1174         if (!dc)
1175                 return IRQ_NONE;
1176
1177         spin_lock(&dc->spin_mutex);
1178         read_iir = readw(dc->reg_iir);
1179
1180         /* Card removed */
1181         if (read_iir == (u16)-1)
1182                 goto none;
1183         /*
1184          * Just handle interrupt enabled in IER
1185          * (by masking with dc->last_ier)
1186          */
1187         read_iir &= dc->last_ier;
1188
1189         if (read_iir == 0)
1190                 goto none;
1191
1192
1193         DBG4("%s irq:0x%04X, prev:0x%04X", interrupt2str(read_iir), read_iir,
1194                 dc->last_ier);
1195
1196         if (read_iir & RESET) {
1197                 if (unlikely(!nozomi_read_config_table(dc))) {
1198                         dc->last_ier = 0x0;
1199                         writew(dc->last_ier, dc->reg_ier);
1200                         dev_err(&dc->pdev->dev, "Could not read status from "
1201                                 "card, we should disable interface\n");
1202                 } else {
1203                         writew(RESET, dc->reg_fcr);
1204                 }
1205                 /* No more useful info if this was the reset interrupt. */
1206                 goto exit_handler;
1207         }
1208         if (read_iir & CTRL_UL) {
1209                 DBG1("CTRL_UL");
1210                 dc->last_ier &= ~CTRL_UL;
1211                 writew(dc->last_ier, dc->reg_ier);
1212                 if (send_flow_control(dc)) {
1213                         writew(CTRL_UL, dc->reg_fcr);
1214                         dc->last_ier = dc->last_ier | CTRL_UL;
1215                         writew(dc->last_ier, dc->reg_ier);
1216                 }
1217         }
1218         if (read_iir & CTRL_DL) {
1219                 receive_flow_control(dc);
1220                 writew(CTRL_DL, dc->reg_fcr);
1221         }
1222         if (read_iir & MDM_DL) {
1223                 if (!handle_data_dl(dc, PORT_MDM,
1224                                 &(dc->port[PORT_MDM].toggle_dl), read_iir,
1225                                 MDM_DL1, MDM_DL2)) {
1226                         dev_err(&dc->pdev->dev, "MDM_DL out of sync!\n");
1227                         goto exit_handler;
1228                 }
1229         }
1230         if (read_iir & MDM_UL) {
1231                 if (!handle_data_ul(dc, PORT_MDM, read_iir)) {
1232                         dev_err(&dc->pdev->dev, "MDM_UL out of sync!\n");
1233                         goto exit_handler;
1234                 }
1235         }
1236         if (read_iir & DIAG_DL) {
1237                 if (!handle_data_dl(dc, PORT_DIAG,
1238                                 &(dc->port[PORT_DIAG].toggle_dl), read_iir,
1239                                 DIAG_DL1, DIAG_DL2)) {
1240                         dev_err(&dc->pdev->dev, "DIAG_DL out of sync!\n");
1241                         goto exit_handler;
1242                 }
1243         }
1244         if (read_iir & DIAG_UL) {
1245                 dc->last_ier &= ~DIAG_UL;
1246                 writew(dc->last_ier, dc->reg_ier);
1247                 if (send_data(PORT_DIAG, dc)) {
1248                         writew(DIAG_UL, dc->reg_fcr);
1249                         dc->last_ier = dc->last_ier | DIAG_UL;
1250                         writew(dc->last_ier, dc->reg_ier);
1251                 }
1252         }
1253         if (read_iir & APP1_DL) {
1254                 if (receive_data(PORT_APP1, dc))
1255                         writew(APP1_DL, dc->reg_fcr);
1256         }
1257         if (read_iir & APP1_UL) {
1258                 dc->last_ier &= ~APP1_UL;
1259                 writew(dc->last_ier, dc->reg_ier);
1260                 if (send_data(PORT_APP1, dc)) {
1261                         writew(APP1_UL, dc->reg_fcr);
1262                         dc->last_ier = dc->last_ier | APP1_UL;
1263                         writew(dc->last_ier, dc->reg_ier);
1264                 }
1265         }
1266         if (read_iir & APP2_DL) {
1267                 if (receive_data(PORT_APP2, dc))
1268                         writew(APP2_DL, dc->reg_fcr);
1269         }
1270         if (read_iir & APP2_UL) {
1271                 dc->last_ier &= ~APP2_UL;
1272                 writew(dc->last_ier, dc->reg_ier);
1273                 if (send_data(PORT_APP2, dc)) {
1274                         writew(APP2_UL, dc->reg_fcr);
1275                         dc->last_ier = dc->last_ier | APP2_UL;
1276                         writew(dc->last_ier, dc->reg_ier);
1277                 }
1278         }
1279
1280 exit_handler:
1281         spin_unlock(&dc->spin_mutex);
1282         for (a = 0; a < NOZOMI_MAX_PORTS; a++) {
1283                 struct tty_struct *tty;
1284                 if (test_and_clear_bit(a, &dc->flip)) {
1285                         tty = tty_port_tty_get(&dc->port[a].port);
1286                         if (tty)
1287                                 tty_flip_buffer_push(tty);
1288                         tty_kref_put(tty);
1289                 }
1290         }
1291         return IRQ_HANDLED;
1292 none:
1293         spin_unlock(&dc->spin_mutex);
1294         return IRQ_NONE;
1295 }
1296
1297 static void nozomi_get_card_type(struct nozomi *dc)
1298 {
1299         int i;
1300         u32 size = 0;
1301
1302         for (i = 0; i < 6; i++)
1303                 size += pci_resource_len(dc->pdev, i);
1304
1305         /* Assume card type F32_8 if no match */
1306         dc->card_type = size == 2048 ? F32_2 : F32_8;
1307
1308         dev_info(&dc->pdev->dev, "Card type is: %d\n", dc->card_type);
1309 }
1310
1311 static void nozomi_setup_private_data(struct nozomi *dc)
1312 {
1313         void __iomem *offset = dc->base_addr + dc->card_type / 2;
1314         unsigned int i;
1315
1316         dc->reg_fcr = (void __iomem *)(offset + R_FCR);
1317         dc->reg_iir = (void __iomem *)(offset + R_IIR);
1318         dc->reg_ier = (void __iomem *)(offset + R_IER);
1319         dc->last_ier = 0;
1320         dc->flip = 0;
1321
1322         dc->port[PORT_MDM].token_dl = MDM_DL;
1323         dc->port[PORT_DIAG].token_dl = DIAG_DL;
1324         dc->port[PORT_APP1].token_dl = APP1_DL;
1325         dc->port[PORT_APP2].token_dl = APP2_DL;
1326
1327         for (i = 0; i < MAX_PORT; i++)
1328                 init_waitqueue_head(&dc->port[i].tty_wait);
1329 }
1330
1331 static ssize_t card_type_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, "%d\n", dc->card_type);
1337 }
1338 static DEVICE_ATTR(card_type, S_IRUGO, card_type_show, NULL);
1339
1340 static ssize_t open_ttys_show(struct device *dev, struct device_attribute *attr,
1341                           char *buf)
1342 {
1343         const struct nozomi *dc = pci_get_drvdata(to_pci_dev(dev));
1344
1345         return sprintf(buf, "%u\n", dc->open_ttys);
1346 }
1347 static DEVICE_ATTR(open_ttys, S_IRUGO, open_ttys_show, NULL);
1348
1349 static void make_sysfs_files(struct nozomi *dc)
1350 {
1351         if (device_create_file(&dc->pdev->dev, &dev_attr_card_type))
1352                 dev_err(&dc->pdev->dev,
1353                         "Could not create sysfs file for card_type\n");
1354         if (device_create_file(&dc->pdev->dev, &dev_attr_open_ttys))
1355                 dev_err(&dc->pdev->dev,
1356                         "Could not create sysfs file for open_ttys\n");
1357 }
1358
1359 static void remove_sysfs_files(struct nozomi *dc)
1360 {
1361         device_remove_file(&dc->pdev->dev, &dev_attr_card_type);
1362         device_remove_file(&dc->pdev->dev, &dev_attr_open_ttys);
1363 }
1364
1365 /* Allocate memory for one device */
1366 static int __devinit nozomi_card_init(struct pci_dev *pdev,
1367                                       const struct pci_device_id *ent)
1368 {
1369         resource_size_t start;
1370         int ret;
1371         struct nozomi *dc = NULL;
1372         int ndev_idx;
1373         int i;
1374
1375         dev_dbg(&pdev->dev, "Init, new card found\n");
1376
1377         for (ndev_idx = 0; ndev_idx < ARRAY_SIZE(ndevs); ndev_idx++)
1378                 if (!ndevs[ndev_idx])
1379                         break;
1380
1381         if (ndev_idx >= ARRAY_SIZE(ndevs)) {
1382                 dev_err(&pdev->dev, "no free tty range for this card left\n");
1383                 ret = -EIO;
1384                 goto err;
1385         }
1386
1387         dc = kzalloc(sizeof(struct nozomi), GFP_KERNEL);
1388         if (unlikely(!dc)) {
1389                 dev_err(&pdev->dev, "Could not allocate memory\n");
1390                 ret = -ENOMEM;
1391                 goto err_free;
1392         }
1393
1394         dc->pdev = pdev;
1395
1396         ret = pci_enable_device(dc->pdev);
1397         if (ret) {
1398                 dev_err(&pdev->dev, "Failed to enable PCI Device\n");
1399                 goto err_free;
1400         }
1401
1402         ret = pci_request_regions(dc->pdev, NOZOMI_NAME);
1403         if (ret) {
1404                 dev_err(&pdev->dev, "I/O address 0x%04x already in use\n",
1405                         (int) /* nozomi_private.io_addr */ 0);
1406                 goto err_disable_device;
1407         }
1408
1409         start = pci_resource_start(dc->pdev, 0);
1410         if (start == 0) {
1411                 dev_err(&pdev->dev, "No I/O address for card detected\n");
1412                 ret = -ENODEV;
1413                 goto err_rel_regs;
1414         }
1415
1416         /* Find out what card type it is */
1417         nozomi_get_card_type(dc);
1418
1419         dc->base_addr = ioremap_nocache(start, dc->card_type);
1420         if (!dc->base_addr) {
1421                 dev_err(&pdev->dev, "Unable to map card MMIO\n");
1422                 ret = -ENODEV;
1423                 goto err_rel_regs;
1424         }
1425
1426         dc->send_buf = kmalloc(SEND_BUF_MAX, GFP_KERNEL);
1427         if (!dc->send_buf) {
1428                 dev_err(&pdev->dev, "Could not allocate send buffer?\n");
1429                 ret = -ENOMEM;
1430                 goto err_free_sbuf;
1431         }
1432
1433         for (i = PORT_MDM; i < MAX_PORT; i++) {
1434                 if (kfifo_alloc(&dc->port[i].fifo_ul,
1435                       FIFO_BUFFER_SIZE_UL, GFP_ATOMIC)) {
1436                         dev_err(&pdev->dev,
1437                                         "Could not allocate kfifo buffer\n");
1438                         ret = -ENOMEM;
1439                         goto err_free_kfifo;
1440                 }
1441         }
1442
1443         spin_lock_init(&dc->spin_mutex);
1444
1445         nozomi_setup_private_data(dc);
1446
1447         /* Disable all interrupts */
1448         dc->last_ier = 0;
1449         writew(dc->last_ier, dc->reg_ier);
1450
1451         ret = request_irq(pdev->irq, &interrupt_handler, IRQF_SHARED,
1452                         NOZOMI_NAME, dc);
1453         if (unlikely(ret)) {
1454                 dev_err(&pdev->dev, "can't request irq %d\n", pdev->irq);
1455                 goto err_free_kfifo;
1456         }
1457
1458         DBG1("base_addr: %p", dc->base_addr);
1459
1460         make_sysfs_files(dc);
1461
1462         dc->index_start = ndev_idx * MAX_PORT;
1463         ndevs[ndev_idx] = dc;
1464
1465         pci_set_drvdata(pdev, dc);
1466
1467         /* Enable RESET interrupt */
1468         dc->last_ier = RESET;
1469         iowrite16(dc->last_ier, dc->reg_ier);
1470
1471         dc->state = NOZOMI_STATE_ENABLED;
1472
1473         for (i = 0; i < MAX_PORT; i++) {
1474                 struct device *tty_dev;
1475                 struct port *port = &dc->port[i];
1476                 port->dc = dc;
1477                 mutex_init(&port->tty_sem);
1478                 tty_port_init(&port->port);
1479                 port->port.ops = &noz_tty_port_ops;
1480                 tty_dev = tty_register_device(ntty_driver, dc->index_start + i,
1481                                                         &pdev->dev);
1482
1483                 if (IS_ERR(tty_dev)) {
1484                         ret = PTR_ERR(tty_dev);
1485                         dev_err(&pdev->dev, "Could not allocate tty?\n");
1486                         goto err_free_tty;
1487                 }
1488         }
1489
1490         return 0;
1491
1492 err_free_tty:
1493         for (i = dc->index_start; i < dc->index_start + MAX_PORT; ++i)
1494                 tty_unregister_device(ntty_driver, i);
1495 err_free_kfifo:
1496         for (i = 0; i < MAX_PORT; i++)
1497                 kfifo_free(&dc->port[i].fifo_ul);
1498 err_free_sbuf:
1499         kfree(dc->send_buf);
1500         iounmap(dc->base_addr);
1501 err_rel_regs:
1502         pci_release_regions(pdev);
1503 err_disable_device:
1504         pci_disable_device(pdev);
1505 err_free:
1506         kfree(dc);
1507 err:
1508         return ret;
1509 }
1510
1511 static void __devexit tty_exit(struct nozomi *dc)
1512 {
1513         unsigned int i;
1514
1515         DBG1(" ");
1516
1517         flush_scheduled_work();
1518
1519         for (i = 0; i < MAX_PORT; ++i) {
1520                 struct tty_struct *tty = tty_port_tty_get(&dc->port[i].port);
1521                 if (tty && list_empty(&tty->hangup_work.entry))
1522                         tty_hangup(tty);
1523                 tty_kref_put(tty);
1524         }
1525         /* Racy below - surely should wait for scheduled work to be done or
1526            complete off a hangup method ? */
1527         while (dc->open_ttys)
1528                 msleep(1);
1529         for (i = dc->index_start; i < dc->index_start + MAX_PORT; ++i)
1530                 tty_unregister_device(ntty_driver, i);
1531 }
1532
1533 /* Deallocate memory for one device */
1534 static void __devexit nozomi_card_exit(struct pci_dev *pdev)
1535 {
1536         int i;
1537         struct ctrl_ul ctrl;
1538         struct nozomi *dc = pci_get_drvdata(pdev);
1539
1540         /* Disable all interrupts */
1541         dc->last_ier = 0;
1542         writew(dc->last_ier, dc->reg_ier);
1543
1544         tty_exit(dc);
1545
1546         /* Send 0x0001, command card to resend the reset token.  */
1547         /* This is to get the reset when the module is reloaded. */
1548         ctrl.port = 0x00;
1549         ctrl.reserved = 0;
1550         ctrl.RTS = 0;
1551         ctrl.DTR = 1;
1552         DBG1("sending flow control 0x%04X", *((u16 *)&ctrl));
1553
1554         /* Setup dc->reg addresses to we can use defines here */
1555         write_mem32(dc->port[PORT_CTRL].ul_addr[0], (u32 *)&ctrl, 2);
1556         writew(CTRL_UL, dc->reg_fcr);   /* push the token to the card. */
1557
1558         remove_sysfs_files(dc);
1559
1560         free_irq(pdev->irq, dc);
1561
1562         for (i = 0; i < MAX_PORT; i++)
1563                 kfifo_free(&dc->port[i].fifo_ul);
1564
1565         kfree(dc->send_buf);
1566
1567         iounmap(dc->base_addr);
1568
1569         pci_release_regions(pdev);
1570
1571         pci_disable_device(pdev);
1572
1573         ndevs[dc->index_start / MAX_PORT] = NULL;
1574
1575         kfree(dc);
1576 }
1577
1578 static void set_rts(const struct tty_struct *tty, int rts)
1579 {
1580         struct port *port = get_port_by_tty(tty);
1581
1582         port->ctrl_ul.RTS = rts;
1583         port->update_flow_control = 1;
1584         enable_transmit_ul(PORT_CTRL, get_dc_by_tty(tty));
1585 }
1586
1587 static void set_dtr(const struct tty_struct *tty, int dtr)
1588 {
1589         struct port *port = get_port_by_tty(tty);
1590
1591         DBG1("SETTING DTR index: %d, dtr: %d", tty->index, dtr);
1592
1593         port->ctrl_ul.DTR = dtr;
1594         port->update_flow_control = 1;
1595         enable_transmit_ul(PORT_CTRL, get_dc_by_tty(tty));
1596 }
1597
1598 /*
1599  * ----------------------------------------------------------------------------
1600  * TTY code
1601  * ----------------------------------------------------------------------------
1602  */
1603
1604 static int ntty_install(struct tty_driver *driver, struct tty_struct *tty)
1605 {
1606         struct port *port = get_port_by_tty(tty);
1607         struct nozomi *dc = get_dc_by_tty(tty);
1608         int ret;
1609         if (!port || !dc || dc->state != NOZOMI_STATE_READY)
1610                 return -ENODEV;
1611         ret = tty_init_termios(tty);
1612         if (ret == 0) {
1613                 tty_driver_kref_get(driver);
1614                 driver->ttys[tty->index] = tty;
1615         }
1616         return ret;
1617 }
1618
1619 static void ntty_cleanup(struct tty_struct *tty)
1620 {
1621         tty->driver_data = NULL;
1622 }
1623
1624 static int ntty_activate(struct tty_port *tport, struct tty_struct *tty)
1625 {
1626         struct port *port = container_of(tport, struct port, port);
1627         struct nozomi *dc = port->dc;
1628         unsigned long flags;
1629
1630         DBG1("open: %d", port->token_dl);
1631         spin_lock_irqsave(&dc->spin_mutex, flags);
1632         dc->last_ier = dc->last_ier | port->token_dl;
1633         writew(dc->last_ier, dc->reg_ier);
1634         dc->open_ttys++;
1635         spin_unlock_irqrestore(&dc->spin_mutex, flags);
1636         printk("noz: activated %d: %p\n", tty->index, tport);
1637         return 0;
1638 }
1639
1640 static int ntty_open(struct tty_struct *tty, struct file *filp)
1641 {
1642         struct port *port = get_port_by_tty(tty);
1643         return tty_port_open(&port->port, tty, filp);
1644 }
1645
1646 static void ntty_shutdown(struct tty_port *tport)
1647 {
1648         struct port *port = container_of(tport, struct port, port);
1649         struct nozomi *dc = port->dc;
1650         unsigned long flags;
1651
1652         DBG1("close: %d", port->token_dl);
1653         spin_lock_irqsave(&dc->spin_mutex, flags);
1654         dc->last_ier &= ~(port->token_dl);
1655         writew(dc->last_ier, dc->reg_ier);
1656         dc->open_ttys--;
1657         spin_unlock_irqrestore(&dc->spin_mutex, flags);
1658         printk("noz: shutdown %p\n", tport);
1659 }
1660
1661 static void ntty_close(struct tty_struct *tty, struct file *filp)
1662 {
1663         struct port *port = tty->driver_data;
1664         if (port)
1665                 tty_port_close(&port->port, tty, filp);
1666 }
1667
1668 static void ntty_hangup(struct tty_struct *tty)
1669 {
1670         struct port *port = tty->driver_data;
1671         tty_port_hangup(&port->port);
1672 }
1673
1674 /*
1675  * called when the userspace process writes to the tty (/dev/noz*).
1676  * Data is inserted into a fifo, which is then read and transfered to the modem.
1677  */
1678 static int ntty_write(struct tty_struct *tty, const unsigned char *buffer,
1679                       int count)
1680 {
1681         int rval = -EINVAL;
1682         struct nozomi *dc = get_dc_by_tty(tty);
1683         struct port *port = tty->driver_data;
1684         unsigned long flags;
1685
1686         /* DBG1( "WRITEx: %d, index = %d", count, index); */
1687
1688         if (!dc || !port)
1689                 return -ENODEV;
1690
1691         mutex_lock(&port->tty_sem);
1692
1693         if (unlikely(!port->port.count)) {
1694                 DBG1(" ");
1695                 goto exit;
1696         }
1697
1698         rval = kfifo_in(&port->fifo_ul, (unsigned char *)buffer, count);
1699
1700         /* notify card */
1701         if (unlikely(dc == NULL)) {
1702                 DBG1("No device context?");
1703                 goto exit;
1704         }
1705
1706         spin_lock_irqsave(&dc->spin_mutex, flags);
1707         /* CTS is only valid on the modem channel */
1708         if (port == &(dc->port[PORT_MDM])) {
1709                 if (port->ctrl_dl.CTS) {
1710                         DBG4("Enable interrupt");
1711                         enable_transmit_ul(tty->index % MAX_PORT, dc);
1712                 } else {
1713                         dev_err(&dc->pdev->dev,
1714                                 "CTS not active on modem port?\n");
1715                 }
1716         } else {
1717                 enable_transmit_ul(tty->index % MAX_PORT, dc);
1718         }
1719         spin_unlock_irqrestore(&dc->spin_mutex, flags);
1720
1721 exit:
1722         mutex_unlock(&port->tty_sem);
1723         return rval;
1724 }
1725
1726 /*
1727  * Calculate how much is left in device
1728  * This method is called by the upper tty layer.
1729  *   #according to sources N_TTY.c it expects a value >= 0 and
1730  *    does not check for negative values.
1731  *
1732  * If the port is unplugged report lots of room and let the bits
1733  * dribble away so we don't block anything.
1734  */
1735 static int ntty_write_room(struct tty_struct *tty)
1736 {
1737         struct port *port = tty->driver_data;
1738         int room = 4096;
1739         const struct nozomi *dc = get_dc_by_tty(tty);
1740
1741         if (dc) {
1742                 mutex_lock(&port->tty_sem);
1743                 if (port->port.count)
1744                         room = port->fifo_ul.size -
1745                                         kfifo_len(&port->fifo_ul);
1746                 mutex_unlock(&port->tty_sem);
1747         }
1748         return room;
1749 }
1750
1751 /* Gets io control parameters */
1752 static int ntty_tiocmget(struct tty_struct *tty, struct file *file)
1753 {
1754         const struct port *port = tty->driver_data;
1755         const struct ctrl_dl *ctrl_dl = &port->ctrl_dl;
1756         const struct ctrl_ul *ctrl_ul = &port->ctrl_ul;
1757
1758         /* Note: these could change under us but it is not clear this
1759            matters if so */
1760         return  (ctrl_ul->RTS ? TIOCM_RTS : 0) |
1761                 (ctrl_ul->DTR ? TIOCM_DTR : 0) |
1762                 (ctrl_dl->DCD ? TIOCM_CAR : 0) |
1763                 (ctrl_dl->RI  ? TIOCM_RNG : 0) |
1764                 (ctrl_dl->DSR ? TIOCM_DSR : 0) |
1765                 (ctrl_dl->CTS ? TIOCM_CTS : 0);
1766 }
1767
1768 /* Sets io controls parameters */
1769 static int ntty_tiocmset(struct tty_struct *tty, struct file *file,
1770         unsigned int set, unsigned int clear)
1771 {
1772         struct nozomi *dc = get_dc_by_tty(tty);
1773         unsigned long flags;
1774
1775         spin_lock_irqsave(&dc->spin_mutex, flags);
1776         if (set & TIOCM_RTS)
1777                 set_rts(tty, 1);
1778         else if (clear & TIOCM_RTS)
1779                 set_rts(tty, 0);
1780
1781         if (set & TIOCM_DTR)
1782                 set_dtr(tty, 1);
1783         else if (clear & TIOCM_DTR)
1784                 set_dtr(tty, 0);
1785         spin_unlock_irqrestore(&dc->spin_mutex, flags);
1786
1787         return 0;
1788 }
1789
1790 static int ntty_cflags_changed(struct port *port, unsigned long flags,
1791                 struct async_icount *cprev)
1792 {
1793         const struct async_icount cnow = port->tty_icount;
1794         int ret;
1795
1796         ret =   ((flags & TIOCM_RNG) && (cnow.rng != cprev->rng)) ||
1797                 ((flags & TIOCM_DSR) && (cnow.dsr != cprev->dsr)) ||
1798                 ((flags & TIOCM_CD)  && (cnow.dcd != cprev->dcd)) ||
1799                 ((flags & TIOCM_CTS) && (cnow.cts != cprev->cts));
1800
1801         *cprev = cnow;
1802
1803         return ret;
1804 }
1805
1806 static int ntty_ioctl_tiocgicount(struct port *port, void __user *argp)
1807 {
1808         const struct async_icount cnow = port->tty_icount;
1809         struct serial_icounter_struct icount;
1810
1811         icount.cts = cnow.cts;
1812         icount.dsr = cnow.dsr;
1813         icount.rng = cnow.rng;
1814         icount.dcd = cnow.dcd;
1815         icount.rx = cnow.rx;
1816         icount.tx = cnow.tx;
1817         icount.frame = cnow.frame;
1818         icount.overrun = cnow.overrun;
1819         icount.parity = cnow.parity;
1820         icount.brk = cnow.brk;
1821         icount.buf_overrun = cnow.buf_overrun;
1822
1823         return copy_to_user(argp, &icount, sizeof(icount)) ? -EFAULT : 0;
1824 }
1825
1826 static int ntty_ioctl(struct tty_struct *tty, struct file *file,
1827                       unsigned int cmd, unsigned long arg)
1828 {
1829         struct port *port = tty->driver_data;
1830         void __user *argp = (void __user *)arg;
1831         int rval = -ENOIOCTLCMD;
1832
1833         DBG1("******** IOCTL, cmd: %d", cmd);
1834
1835         switch (cmd) {
1836         case TIOCMIWAIT: {
1837                 struct async_icount cprev = port->tty_icount;
1838
1839                 rval = wait_event_interruptible(port->tty_wait,
1840                                 ntty_cflags_changed(port, arg, &cprev));
1841                 break;
1842         } case TIOCGICOUNT:
1843                 rval = ntty_ioctl_tiocgicount(port, argp);
1844                 break;
1845         default:
1846                 DBG1("ERR: 0x%08X, %d", cmd, cmd);
1847                 break;
1848         };
1849
1850         return rval;
1851 }
1852
1853 /*
1854  * Called by the upper tty layer when tty buffers are ready
1855  * to receive data again after a call to throttle.
1856  */
1857 static void ntty_unthrottle(struct tty_struct *tty)
1858 {
1859         struct nozomi *dc = get_dc_by_tty(tty);
1860         unsigned long flags;
1861
1862         DBG1("UNTHROTTLE");
1863         spin_lock_irqsave(&dc->spin_mutex, flags);
1864         enable_transmit_dl(tty->index % MAX_PORT, dc);
1865         set_rts(tty, 1);
1866
1867         spin_unlock_irqrestore(&dc->spin_mutex, flags);
1868 }
1869
1870 /*
1871  * Called by the upper tty layer when the tty buffers are almost full.
1872  * The driver should stop send more data.
1873  */
1874 static void ntty_throttle(struct tty_struct *tty)
1875 {
1876         struct nozomi *dc = get_dc_by_tty(tty);
1877         unsigned long flags;
1878
1879         DBG1("THROTTLE");
1880         spin_lock_irqsave(&dc->spin_mutex, flags);
1881         set_rts(tty, 0);
1882         spin_unlock_irqrestore(&dc->spin_mutex, flags);
1883 }
1884
1885 /* Returns number of chars in buffer, called by tty layer */
1886 static s32 ntty_chars_in_buffer(struct tty_struct *tty)
1887 {
1888         struct port *port = tty->driver_data;
1889         struct nozomi *dc = get_dc_by_tty(tty);
1890         s32 rval = 0;
1891
1892         if (unlikely(!dc || !port)) {
1893                 goto exit_in_buffer;
1894         }
1895
1896         if (unlikely(!port->port.count)) {
1897                 dev_err(&dc->pdev->dev, "No tty open?\n");
1898                 goto exit_in_buffer;
1899         }
1900
1901         rval = kfifo_len(&port->fifo_ul);
1902
1903 exit_in_buffer:
1904         return rval;
1905 }
1906
1907 static const struct tty_port_operations noz_tty_port_ops = {
1908         .activate = ntty_activate,
1909         .shutdown = ntty_shutdown,
1910 };
1911
1912 static const struct tty_operations tty_ops = {
1913         .ioctl = ntty_ioctl,
1914         .open = ntty_open,
1915         .close = ntty_close,
1916         .hangup = ntty_hangup,
1917         .write = ntty_write,
1918         .write_room = ntty_write_room,
1919         .unthrottle = ntty_unthrottle,
1920         .throttle = ntty_throttle,
1921         .chars_in_buffer = ntty_chars_in_buffer,
1922         .tiocmget = ntty_tiocmget,
1923         .tiocmset = ntty_tiocmset,
1924         .install = ntty_install,
1925         .cleanup = ntty_cleanup,
1926 };
1927
1928 /* Module initialization */
1929 static struct pci_driver nozomi_driver = {
1930         .name = NOZOMI_NAME,
1931         .id_table = nozomi_pci_tbl,
1932         .probe = nozomi_card_init,
1933         .remove = __devexit_p(nozomi_card_exit),
1934 };
1935
1936 static __init int nozomi_init(void)
1937 {
1938         int ret;
1939
1940         printk(KERN_INFO "Initializing %s\n", VERSION_STRING);
1941
1942         ntty_driver = alloc_tty_driver(NTTY_TTY_MAXMINORS);
1943         if (!ntty_driver)
1944                 return -ENOMEM;
1945
1946         ntty_driver->owner = THIS_MODULE;
1947         ntty_driver->driver_name = NOZOMI_NAME_TTY;
1948         ntty_driver->name = "noz";
1949         ntty_driver->major = 0;
1950         ntty_driver->type = TTY_DRIVER_TYPE_SERIAL;
1951         ntty_driver->subtype = SERIAL_TYPE_NORMAL;
1952         ntty_driver->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_DYNAMIC_DEV;
1953         ntty_driver->init_termios = tty_std_termios;
1954         ntty_driver->init_termios.c_cflag = B115200 | CS8 | CREAD | \
1955                                                 HUPCL | CLOCAL;
1956         ntty_driver->init_termios.c_ispeed = 115200;
1957         ntty_driver->init_termios.c_ospeed = 115200;
1958         tty_set_operations(ntty_driver, &tty_ops);
1959
1960         ret = tty_register_driver(ntty_driver);
1961         if (ret) {
1962                 printk(KERN_ERR "Nozomi: failed to register ntty driver\n");
1963                 goto free_tty;
1964         }
1965
1966         ret = pci_register_driver(&nozomi_driver);
1967         if (ret) {
1968                 printk(KERN_ERR "Nozomi: can't register pci driver\n");
1969                 goto unr_tty;
1970         }
1971
1972         return 0;
1973 unr_tty:
1974         tty_unregister_driver(ntty_driver);
1975 free_tty:
1976         put_tty_driver(ntty_driver);
1977         return ret;
1978 }
1979
1980 static __exit void nozomi_exit(void)
1981 {
1982         printk(KERN_INFO "Unloading %s\n", DRIVER_DESC);
1983         pci_unregister_driver(&nozomi_driver);
1984         tty_unregister_driver(ntty_driver);
1985         put_tty_driver(ntty_driver);
1986 }
1987
1988 module_init(nozomi_init);
1989 module_exit(nozomi_exit);
1990
1991 module_param(debug, int, S_IRUGO | S_IWUSR);
1992
1993 MODULE_LICENSE("Dual BSD/GPL");
1994 MODULE_DESCRIPTION(DRIVER_DESC);