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 <asm/byteorder.h>
  59
  60 #include <linux/delay.h>
  61
  62
  63 #define VERSION_STRING DRIVER_DESC " 2.1d (build date: " \
  64                                         __DATE__ " " __TIME__ ")"
  65
  66 /*    Macros definitions */
  67
  68 /* Default debug printout level */
  69 #define NOZOMI_DEBUG_LEVEL 0x00
  70
  71 #define P_BUF_SIZE 128
  72 #define NFO(_err_flag_, args...)                                \
  73 do {                                                            \
  74         char tmp[P_BUF_SIZE];                                   \
  75         snprintf(tmp, sizeof(tmp), ##args);                     \
  76         printk(_err_flag_ "[%d] %s(): %s\n", __LINE__,          \
  77                 __func__, tmp);                         \
  78 } while (0)
  79
  80 #define DBG1(args...) D_(0x01, ##args)
  81 #define DBG2(args...) D_(0x02, ##args)
  82 #define DBG3(args...) D_(0x04, ##args)
  83 #define DBG4(args...) D_(0x08, ##args)
  84 #define DBG5(args...) D_(0x10, ##args)
  85 #define DBG6(args...) D_(0x20, ##args)
  86 #define DBG7(args...) D_(0x40, ##args)
  87 #define DBG8(args...) D_(0x80, ##args)
  88
  89 #ifdef DEBUG
  90 /* Do we need this settable at runtime? */
  91 static int debug = NOZOMI_DEBUG_LEVEL;
  92
  93 #define D(lvl, args...)  do \
  94                         {if (lvl & debug) NFO(KERN_DEBUG, ##args); } \
  95                         while (0)
  96 #define D_(lvl, args...) D(lvl, ##args)
  97
  98 /* These printouts are always printed */
  99
 100 #else
 101 static int debug;
 102 #define D_(lvl, args...)
 103 #endif
 104
 105 /* TODO: rewrite to optimize macros... */
 106
 107 #define TMP_BUF_MAX 256
 108
 109 #define DUMP(buf__,len__) \
 110   do {  \
 111     char tbuf[TMP_BUF_MAX] = {0};\
 112     if (len__ > 1) {\
 113         snprintf(tbuf, len__ > TMP_BUF_MAX ? TMP_BUF_MAX : len__, "%s", buf__);\
 114         if (tbuf[len__-2] == '\r') {\
 115                 tbuf[len__-2] = 'r';\
 116         } \
 117         DBG1("SENDING: '%s' (%d+n)", tbuf, len__);\
 118     } else {\
 119         DBG1("SENDING: '%s' (%d)", tbuf, len__);\
 120     } \
 121 } while (0)
 122
 123 /*    Defines */
 124 #define NOZOMI_NAME             "nozomi"
 125 #define NOZOMI_NAME_TTY         "nozomi_tty"
 126 #define DRIVER_DESC             "Nozomi driver"
 127
 128 #define NTTY_TTY_MAXMINORS      256
 129 #define NTTY_FIFO_BUFFER_SIZE   8192
 130
 131 /* Must be power of 2 */
 132 #define FIFO_BUFFER_SIZE_UL     8192
 133
 134 /* Size of tmp send buffer to card */
 135 #define SEND_BUF_MAX            1024
 136 #define RECEIVE_BUF_MAX         4
 137
 138
 139 #define R_IIR           0x0000  /* Interrupt Identity Register */
 140 #define R_FCR           0x0000  /* Flow Control Register */
 141 #define R_IER           0x0004  /* Interrupt Enable Register */
 142
 143 #define CONFIG_MAGIC    0xEFEFFEFE
 144 #define TOGGLE_VALID    0x0000
 145
 146 /* Definition of interrupt tokens */
 147 #define MDM_DL1         0x0001
 148 #define MDM_UL1         0x0002
 149 #define MDM_DL2         0x0004
 150 #define MDM_UL2         0x0008
 151 #define DIAG_DL1        0x0010
 152 #define DIAG_DL2        0x0020
 153 #define DIAG_UL         0x0040
 154 #define APP1_DL         0x0080
 155 #define APP1_UL         0x0100
 156 #define APP2_DL         0x0200
 157 #define APP2_UL         0x0400
 158 #define CTRL_DL         0x0800
 159 #define CTRL_UL         0x1000
 160 #define RESET           0x8000
 161
 162 #define MDM_DL          (MDM_DL1  | MDM_DL2)
 163 #define MDM_UL          (MDM_UL1  | MDM_UL2)
 164 #define DIAG_DL         (DIAG_DL1 | DIAG_DL2)
 165
 166 /* modem signal definition */
 167 #define CTRL_DSR        0x0001
 168 #define CTRL_DCD        0x0002
 169 #define CTRL_RI         0x0004
 170 #define CTRL_CTS        0x0008
 171
 172 #define CTRL_DTR        0x0001
 173 #define CTRL_RTS        0x0002
 174
 175 #define MAX_PORT                4
 176 #define NOZOMI_MAX_PORTS        5
 177 #define NOZOMI_MAX_CARDS        (NTTY_TTY_MAXMINORS / MAX_PORT)
 178
 179 /*    Type definitions */
 180
 181 /*
 182  * There are two types of nozomi cards,
 183  * one with 2048 memory and with 8192 memory
 184  */
 185 enum card_type {
 186         F32_2 = 2048,   /* 512 bytes downlink + uplink * 2 -> 2048 */
 187         F32_8 = 8192,   /* 3072 bytes downl. + 1024 bytes uplink * 2 -> 8192 */
 188 };
 189
 190 /* Initialization states a card can be in */
 191 enum card_state {
 192         NOZOMI_STATE_UKNOWN     = 0,
 193         NOZOMI_STATE_ENABLED    = 1,    /* pci device enabled */
 194         NOZOMI_STATE_ALLOCATED  = 2,    /* config setup done */
 195         NOZOMI_STATE_READY      = 3,    /* flowcontrols received */
 196 };
 197
 198 /* Two different toggle channels exist */
 199 enum channel_type {
 200         CH_A = 0,
 201         CH_B = 1,
 202 };
 203
 204 /* Port definition for the card regarding flow control */
 205 enum ctrl_port_type {
 206         CTRL_CMD        = 0,
 207         CTRL_MDM        = 1,
 208         CTRL_DIAG       = 2,
 209         CTRL_APP1       = 3,
 210         CTRL_APP2       = 4,
 211         CTRL_ERROR      = -1,
 212 };
 213
 214 /* Ports that the nozomi has */
 215 enum port_type {
 216         PORT_MDM        = 0,
 217         PORT_DIAG       = 1,
 218         PORT_APP1       = 2,
 219         PORT_APP2       = 3,
 220         PORT_CTRL       = 4,
 221         PORT_ERROR      = -1,
 222 };
 223
 224 #ifdef __BIG_ENDIAN
 225 /* Big endian */
 226
 227 struct toggles {
 228         unsigned int enabled:5; /*
 229                                  * Toggle fields are valid if enabled is 0,
 230                                  * else A-channels must always be used.
 231                                  */
 232         unsigned int diag_dl:1;
 233         unsigned int mdm_dl:1;
 234         unsigned int mdm_ul:1;
 235 } __attribute__ ((packed));
 236
 237 /* Configuration table to read at startup of card */
 238 /* Is for now only needed during initialization phase */
 239 struct config_table {
 240         u32 signature;
 241         u16 product_information;
 242         u16 version;
 243         u8 pad3[3];
 244         struct toggles toggle;
 245         u8 pad1[4];
 246         u16 dl_mdm_len1;        /*
 247                                  * If this is 64, it can hold
 248                                  * 60 bytes + 4 that is length field
 249                                  */
 250         u16 dl_start;
 251
 252         u16 dl_diag_len1;
 253         u16 dl_mdm_len2;        /*
 254                                  * If this is 64, it can hold
 255                                  * 60 bytes + 4 that is length field
 256                                  */
 257         u16 dl_app1_len;
 258
 259         u16 dl_diag_len2;
 260         u16 dl_ctrl_len;
 261         u16 dl_app2_len;
 262         u8 pad2[16];
 263         u16 ul_mdm_len1;
 264         u16 ul_start;
 265         u16 ul_diag_len;
 266         u16 ul_mdm_len2;
 267         u16 ul_app1_len;
 268         u16 ul_app2_len;
 269         u16 ul_ctrl_len;
 270 } __attribute__ ((packed));
 271
 272 /* This stores all control downlink flags */
 273 struct ctrl_dl {
 274         u8 port;
 275         unsigned int reserved:4;
 276         unsigned int CTS:1;
 277         unsigned int RI:1;
 278         unsigned int DCD:1;
 279         unsigned int DSR:1;
 280 } __attribute__ ((packed));
 281
 282 /* This stores all control uplink flags */
 283 struct ctrl_ul {
 284         u8 port;
 285         unsigned int reserved:6;
 286         unsigned int RTS:1;
 287         unsigned int DTR:1;
 288 } __attribute__ ((packed));
 289
 290 #else
 291 /* Little endian */
 292
 293 /* This represents the toggle information */
 294 struct toggles {
 295         unsigned int mdm_ul:1;
 296         unsigned int mdm_dl:1;
 297         unsigned int diag_dl:1;
 298         unsigned int enabled:5; /*
 299                                  * Toggle fields are valid if enabled is 0,
 300                                  * else A-channels must always be used.
 301                                  */
 302 } __attribute__ ((packed));
 303
 304 /* Configuration table to read at startup of card */
 305 struct config_table {
 306         u32 signature;
 307         u16 version;
 308         u16 product_information;
 309         struct toggles toggle;
 310         u8 pad1[7];
 311         u16 dl_start;
 312         u16 dl_mdm_len1;        /*
 313                                  * If this is 64, it can hold
 314                                  * 60 bytes + 4 that is length field
 315                                  */
 316         u16 dl_mdm_len2;
 317         u16 dl_diag_len1;
 318         u16 dl_diag_len2;
 319         u16 dl_app1_len;
 320         u16 dl_app2_len;
 321         u16 dl_ctrl_len;
 322         u8 pad2[16];
 323         u16 ul_start;
 324         u16 ul_mdm_len2;
 325         u16 ul_mdm_len1;
 326         u16 ul_diag_len;
 327         u16 ul_app1_len;
 328         u16 ul_app2_len;
 329         u16 ul_ctrl_len;
 330 } __attribute__ ((packed));
 331
 332 /* This stores all control downlink flags */
 333 struct ctrl_dl {
 334         unsigned int DSR:1;
 335         unsigned int DCD:1;
 336         unsigned int RI:1;
 337         unsigned int CTS:1;
 338         unsigned int reserverd:4;
 339         u8 port;
 340 } __attribute__ ((packed));
 341
 342 /* This stores all control uplink flags */
 343 struct ctrl_ul {
 344         unsigned int DTR:1;
 345         unsigned int RTS:1;
 346         unsigned int reserved:6;
 347         u8 port;
 348 } __attribute__ ((packed));
 349 #endif
 350
 351 /* This holds all information that is needed regarding a port */
 352 struct port {
 353         struct tty_port port;
 354         u8 update_flow_control;
 355         struct ctrl_ul ctrl_ul;
 356         struct ctrl_dl ctrl_dl;
 357         struct kfifo fifo_ul;
 358         void __iomem *dl_addr[2];
 359         u32 dl_size[2];
 360         u8 toggle_dl;
 361         void __iomem *ul_addr[2];
 362         u32 ul_size[2];
 363         u8 toggle_ul;
 364         u16 token_dl;
 365
 366         /* mutex to ensure one access patch to this port */
 367         struct mutex tty_sem;
 368         wait_queue_head_t tty_wait;
 369         struct async_icount tty_icount;
 370
 371         struct nozomi *dc;
 372 };
 373
 374 /* Private data one for each card in the system */
 375 struct nozomi {
 376         void __iomem *base_addr;
 377         unsigned long flip;
 378
 379         /* Pointers to registers */
 380         void __iomem *reg_iir;
 381         void __iomem *reg_fcr;
 382         void __iomem *reg_ier;
 383
 384         u16 last_ier;
 385         enum card_type card_type;
 386         struct config_table config_table;       /* Configuration table */
 387         struct pci_dev *pdev;
 388         struct port port[NOZOMI_MAX_PORTS];
 389         u8 *send_buf;
 390
 391         spinlock_t spin_mutex;  /* secures access to registers and tty */
 392
 393         unsigned int index_start;
 394         enum card_state state;
 395         u32 open_ttys;
 396 };
 397
 398 /* This is a data packet that is read or written to/from card */
 399 struct buffer {
 400         u32 size;               /* size is the length of the data buffer */
 401         u8 *data;
 402 } __attribute__ ((packed));
 403
 404 /*    Global variables */
 405 static const struct pci_device_id nozomi_pci_tbl[] __devinitconst = {
 406         {PCI_DEVICE(0x1931, 0x000c)},   /* Nozomi HSDPA */
 407         {},
 408 };
 409
 410 MODULE_DEVICE_TABLE(pci, nozomi_pci_tbl);
 411
 412 static struct nozomi *ndevs[NOZOMI_MAX_CARDS];
 413 static struct tty_driver *ntty_driver;
 414
 415 static const struct tty_port_operations noz_tty_port_ops;
 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 __iomem *ptr = 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(ptr));
 452                 goto out;
 453                 break;
 454         case 4: /* 4 bytes */
 455                 *(buf) = __le32_to_cpu(readl(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(ptr));
 465                         i += 2;
 466                 } else {
 467                         /* Read 4 bytes */
 468                         *(buf) = __le32_to_cpu(readl(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 __iomem *ptr = 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), 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), 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), ptr);
 515                         i += 2;
 516                 } else {
 517                         /* 4 bytes */
 518                         writel(__cpu_to_le32(*buf), 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                         memset(&dc->port[i].ctrl_dl, 0, sizeof(struct ctrl_dl));
 689                         memset(&dc->port[i].ctrl_ul, 0, sizeof(struct ctrl_ul));
 690                 }
 691
 692                 /* Enable control channel */
 693                 dc->last_ier = dc->last_ier | CTRL_DL;
 694                 writew(dc->last_ier, dc->reg_ier);
 695
 696                 dc->state = NOZOMI_STATE_ALLOCATED;
 697                 dev_info(&dc->pdev->dev, "Initialization OK!\n");
 698                 return 1;
 699         }
 700
 701         if ((dc->config_table.version > 0)
 702             && (dc->config_table.toggle.enabled != TOGGLE_VALID)) {
 703                 u32 offset = 0;
 704                 DBG1("First phase: pushing upload buffers, clearing download");
 705
 706                 dev_info(&dc->pdev->dev, "Version of card: %d\n",
 707                          dc->config_table.version);
 708
 709                 /* Here we should disable all I/O over F32. */
 710                 setup_memory(dc);
 711
 712                 /*
 713                  * We should send ALL channel pair tokens back along
 714                  * with reset token
 715                  */
 716
 717                 /* push upload modem buffers */
 718                 write_mem32(dc->port[PORT_MDM].ul_addr[CH_A],
 719                         (u32 *) &offset, 4);
 720                 write_mem32(dc->port[PORT_MDM].ul_addr[CH_B],
 721                         (u32 *) &offset, 4);
 722
 723                 writew(MDM_UL | DIAG_DL | MDM_DL, dc->reg_fcr);
 724
 725                 DBG1("First phase done");
 726         }
 727
 728         return 1;
 729 }
 730
 731 /* Enable uplink interrupts  */
 732 static void enable_transmit_ul(enum port_type port, struct nozomi *dc)
 733 {
 734         static const u16 mask[] = {MDM_UL, DIAG_UL, APP1_UL, APP2_UL, CTRL_UL};
 735
 736         if (port < NOZOMI_MAX_PORTS) {
 737                 dc->last_ier |= mask[port];
 738                 writew(dc->last_ier, dc->reg_ier);
 739         } else {
 740                 dev_err(&dc->pdev->dev, "Called with wrong port?\n");
 741         }
 742 }
 743
 744 /* Disable uplink interrupts  */
 745 static void disable_transmit_ul(enum port_type port, struct nozomi *dc)
 746 {
 747         static const u16 mask[] =
 748                 {~MDM_UL, ~DIAG_UL, ~APP1_UL, ~APP2_UL, ~CTRL_UL};
 749
 750         if (port < NOZOMI_MAX_PORTS) {
 751                 dc->last_ier &= mask[port];
 752                 writew(dc->last_ier, dc->reg_ier);
 753         } else {
 754                 dev_err(&dc->pdev->dev, "Called with wrong port?\n");
 755         }
 756 }
 757
 758 /* Enable downlink interrupts */
 759 static void enable_transmit_dl(enum port_type port, struct nozomi *dc)
 760 {
 761         static const u16 mask[] = {MDM_DL, DIAG_DL, APP1_DL, APP2_DL, CTRL_DL};
 762
 763         if (port < NOZOMI_MAX_PORTS) {
 764                 dc->last_ier |= mask[port];
 765                 writew(dc->last_ier, dc->reg_ier);
 766         } else {
 767                 dev_err(&dc->pdev->dev, "Called with wrong port?\n");
 768         }
 769 }
 770
 771 /* Disable downlink interrupts */
 772 static void disable_transmit_dl(enum port_type port, struct nozomi *dc)
 773 {
 774         static const u16 mask[] =
 775                 {~MDM_DL, ~DIAG_DL, ~APP1_DL, ~APP2_DL, ~CTRL_DL};
 776
 777         if (port < NOZOMI_MAX_PORTS) {
 778                 dc->last_ier &= mask[port];
 779                 writew(dc->last_ier, dc->reg_ier);
 780         } else {
 781                 dev_err(&dc->pdev->dev, "Called with wrong port?\n");
 782         }
 783 }
 784
 785 /*
 786  * Return 1 - send buffer to card and ack.
 787  * Return 0 - don't ack, don't send buffer to card.
 788  */
 789 static int send_data(enum port_type index, struct nozomi *dc)
 790 {
 791         u32 size = 0;
 792         struct port *port = &dc->port[index];
 793         const u8 toggle = port->toggle_ul;
 794         void __iomem *addr = port->ul_addr[toggle];
 795         const u32 ul_size = port->ul_size[toggle];
 796         struct tty_struct *tty = tty_port_tty_get(&port->port);
 797
 798         /* Get data from tty and place in buf for now */
 799         size = kfifo_out(&port->fifo_ul, dc->send_buf,
 800                            ul_size < SEND_BUF_MAX ? ul_size : SEND_BUF_MAX);
 801
 802         if (size == 0) {
 803                 DBG4("No more data to send, disable link:");
 804                 tty_kref_put(tty);
 805                 return 0;
 806         }
 807
 808         /* DUMP(buf, size); */
 809
 810         /* Write length + data */
 811         write_mem32(addr, (u32 *) &size, 4);
 812         write_mem32(addr + 4, (u32 *) dc->send_buf, size);
 813
 814         if (tty)
 815                 tty_wakeup(tty);
 816
 817         tty_kref_put(tty);
 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 = tty_port_tty_get(&port->port);
 830         int i, ret;
 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                 ret = 0;
 847                 goto put;
 848         }
 849
 850         if (unlikely(size == 0)) {
 851                 dev_err(&dc->pdev->dev, "size == 0?\n");
 852                 ret = 1;
 853                 goto put;
 854         }
 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         ret = 1;
 874 put:
 875         tty_kref_put(tty);
 876         return ret;
 877 }
 878
 879 /* Debug for interrupts */
 880 #ifdef DEBUG
 881 static char *interrupt2str(u16 interrupt)
 882 {
 883         static char buf[TMP_BUF_MAX];
 884         char *p = buf;
 885
 886         interrupt & MDM_DL1 ? p += snprintf(p, TMP_BUF_MAX, "MDM_DL1 ") : NULL;
 887         interrupt & MDM_DL2 ? p += snprintf(p, TMP_BUF_MAX - (p - buf),
 888                                         "MDM_DL2 ") : NULL;
 889
 890         interrupt & MDM_UL1 ? p += snprintf(p, TMP_BUF_MAX - (p - buf),
 891                                         "MDM_UL1 ") : NULL;
 892         interrupt & MDM_UL2 ? p += snprintf(p, TMP_BUF_MAX - (p - buf),
 893                                         "MDM_UL2 ") : NULL;
 894
 895         interrupt & DIAG_DL1 ? p += snprintf(p, TMP_BUF_MAX - (p - buf),
 896                                         "DIAG_DL1 ") : NULL;
 897         interrupt & DIAG_DL2 ? p += snprintf(p, TMP_BUF_MAX - (p - buf),
 898                                         "DIAG_DL2 ") : NULL;
 899
 900         interrupt & DIAG_UL ? p += snprintf(p, TMP_BUF_MAX - (p - buf),
 901                                         "DIAG_UL ") : NULL;
 902
 903         interrupt & APP1_DL ? p += snprintf(p, TMP_BUF_MAX - (p - buf),
 904                                         "APP1_DL ") : NULL;
 905         interrupt & APP2_DL ? p += snprintf(p, TMP_BUF_MAX - (p - buf),
 906                                         "APP2_DL ") : NULL;
 907
 908         interrupt & APP1_UL ? p += snprintf(p, TMP_BUF_MAX - (p - buf),
 909                                         "APP1_UL ") : NULL;
 910         interrupt & APP2_UL ? p += snprintf(p, TMP_BUF_MAX - (p - buf),
 911                                         "APP2_UL ") : NULL;
 912
 913         interrupt & CTRL_DL ? p += snprintf(p, TMP_BUF_MAX - (p - buf),
 914                                         "CTRL_DL ") : NULL;
 915         interrupt & CTRL_UL ? p += snprintf(p, TMP_BUF_MAX - (p - buf),
 916                                         "CTRL_UL ") : NULL;
 917
 918         interrupt & RESET ? p += snprintf(p, TMP_BUF_MAX - (p - buf),
 919                                         "RESET ") : NULL;
 920
 921         return buf;
 922 }
 923 #endif
 924
 925 /*
 926  * Receive flow control
 927  * Return 1 - If ok, else 0
 928  */
 929 static int receive_flow_control(struct nozomi *dc)
 930 {
 931         enum port_type port = PORT_MDM;
 932         struct ctrl_dl ctrl_dl;
 933         struct ctrl_dl old_ctrl;
 934         u16 enable_ier = 0;
 935
 936         read_mem32((u32 *) &ctrl_dl, dc->port[PORT_CTRL].dl_addr[CH_A], 2);
 937
 938         switch (ctrl_dl.port) {
 939         case CTRL_CMD:
 940                 DBG1("The Base Band sends this value as a response to a "
 941                         "request for IMSI detach sent over the control "
 942                         "channel uplink (see section 7.6.1).");
 943                 break;
 944         case CTRL_MDM:
 945                 port = PORT_MDM;
 946                 enable_ier = MDM_DL;
 947                 break;
 948         case CTRL_DIAG:
 949                 port = PORT_DIAG;
 950                 enable_ier = DIAG_DL;
 951                 break;
 952         case CTRL_APP1:
 953                 port = PORT_APP1;
 954                 enable_ier = APP1_DL;
 955                 break;
 956         case CTRL_APP2:
 957                 port = PORT_APP2;
 958                 enable_ier = APP2_DL;
 959                 if (dc->state == NOZOMI_STATE_ALLOCATED) {
 960                         /*
 961                          * After card initialization the flow control
 962                          * received for APP2 is always the last
 963                          */
 964                         dc->state = NOZOMI_STATE_READY;
 965                         dev_info(&dc->pdev->dev, "Device READY!\n");
 966                 }
 967                 break;
 968         default:
 969                 dev_err(&dc->pdev->dev,
 970                         "ERROR: flow control received for non-existing port\n");
 971                 return 0;
 972         };
 973
 974         DBG1("0x%04X->0x%04X", *((u16 *)&dc->port[port].ctrl_dl),
 975            *((u16 *)&ctrl_dl));
 976
 977         old_ctrl = dc->port[port].ctrl_dl;
 978         dc->port[port].ctrl_dl = ctrl_dl;
 979
 980         if (old_ctrl.CTS == 1 && ctrl_dl.CTS == 0) {
 981                 DBG1("Disable interrupt (0x%04X) on port: %d",
 982                         enable_ier, port);
 983                 disable_transmit_ul(port, dc);
 984
 985         } else if (old_ctrl.CTS == 0 && ctrl_dl.CTS == 1) {
 986
 987                 if (kfifo_len(&dc->port[port].fifo_ul)) {
 988                         DBG1("Enable interrupt (0x%04X) on port: %d",
 989                                 enable_ier, port);
 990                         DBG1("Data in buffer [%d], enable transmit! ",
 991                                 kfifo_len(&dc->port[port].fifo_ul));
 992                         enable_transmit_ul(port, dc);
 993                 } else {
 994                         DBG1("No data in buffer...");
 995                 }
 996         }
 997
 998         if (*(u16 *)&old_ctrl == *(u16 *)&ctrl_dl) {
 999                 DBG1(" No change in mctrl");
1000                 return 1;
1001         }
1002         /* Update statistics */
1003         if (old_ctrl.CTS != ctrl_dl.CTS)
1004                 dc->port[port].tty_icount.cts++;
1005         if (old_ctrl.DSR != ctrl_dl.DSR)
1006                 dc->port[port].tty_icount.dsr++;
1007         if (old_ctrl.RI != ctrl_dl.RI)
1008                 dc->port[port].tty_icount.rng++;
1009         if (old_ctrl.DCD != ctrl_dl.DCD)
1010                 dc->port[port].tty_icount.dcd++;
1011
1012         wake_up_interruptible(&dc->port[port].tty_wait);
1013
1014         DBG1("port: %d DCD(%d), CTS(%d), RI(%d), DSR(%d)",
1015            port,
1016            dc->port[port].tty_icount.dcd, dc->port[port].tty_icount.cts,
1017            dc->port[port].tty_icount.rng, dc->port[port].tty_icount.dsr);
1018
1019         return 1;
1020 }
1021
1022 static enum ctrl_port_type port2ctrl(enum port_type port,
1023                                         const struct nozomi *dc)
1024 {
1025         switch (port) {
1026         case PORT_MDM:
1027                 return CTRL_MDM;
1028         case PORT_DIAG:
1029                 return CTRL_DIAG;
1030         case PORT_APP1:
1031                 return CTRL_APP1;
1032         case PORT_APP2:
1033                 return CTRL_APP2;
1034         default:
1035                 dev_err(&dc->pdev->dev,
1036                         "ERROR: send flow control " \
1037                         "received for non-existing port\n");
1038         };
1039         return CTRL_ERROR;
1040 }
1041
1042 /*
1043  * Send flow control, can only update one channel at a time
1044  * Return 0 - If we have updated all flow control
1045  * Return 1 - If we need to update more flow control, ack current enable more
1046  */
1047 static int send_flow_control(struct nozomi *dc)
1048 {
1049         u32 i, more_flow_control_to_be_updated = 0;
1050         u16 *ctrl;
1051
1052         for (i = PORT_MDM; i < MAX_PORT; i++) {
1053                 if (dc->port[i].update_flow_control) {
1054                         if (more_flow_control_to_be_updated) {
1055                                 /* We have more flow control to be updated */
1056                                 return 1;
1057                         }
1058                         dc->port[i].ctrl_ul.port = port2ctrl(i, dc);
1059                         ctrl = (u16 *)&dc->port[i].ctrl_ul;
1060                         write_mem32(dc->port[PORT_CTRL].ul_addr[0], \
1061                                 (u32 *) ctrl, 2);
1062                         dc->port[i].update_flow_control = 0;
1063                         more_flow_control_to_be_updated = 1;
1064                 }
1065         }
1066         return 0;
1067 }
1068
1069 /*
1070  * Handle downlink data, ports that are handled are modem and diagnostics
1071  * Return 1 - ok
1072  * Return 0 - toggle fields are out of sync
1073  */
1074 static int handle_data_dl(struct nozomi *dc, enum port_type port, u8 *toggle,
1075                         u16 read_iir, u16 mask1, u16 mask2)
1076 {
1077         if (*toggle == 0 && read_iir & mask1) {
1078                 if (receive_data(port, dc)) {
1079                         writew(mask1, dc->reg_fcr);
1080                         *toggle = !(*toggle);
1081                 }
1082
1083                 if (read_iir & mask2) {
1084                         if (receive_data(port, dc)) {
1085                                 writew(mask2, dc->reg_fcr);
1086                                 *toggle = !(*toggle);
1087                         }
1088                 }
1089         } else if (*toggle == 1 && read_iir & mask2) {
1090                 if (receive_data(port, dc)) {
1091                         writew(mask2, dc->reg_fcr);
1092                         *toggle = !(*toggle);
1093                 }
1094
1095                 if (read_iir & mask1) {
1096                         if (receive_data(port, dc)) {
1097                                 writew(mask1, dc->reg_fcr);
1098                                 *toggle = !(*toggle);
1099                         }
1100                 }
1101         } else {
1102                 dev_err(&dc->pdev->dev, "port out of sync!, toggle:%d\n",
1103                         *toggle);
1104                 return 0;
1105         }
1106         return 1;
1107 }
1108
1109 /*
1110  * Handle uplink data, this is currently for the modem port
1111  * Return 1 - ok
1112  * Return 0 - toggle field are out of sync
1113  */
1114 static int handle_data_ul(struct nozomi *dc, enum port_type port, u16 read_iir)
1115 {
1116         u8 *toggle = &(dc->port[port].toggle_ul);
1117
1118         if (*toggle == 0 && read_iir & MDM_UL1) {
1119                 dc->last_ier &= ~MDM_UL;
1120                 writew(dc->last_ier, dc->reg_ier);
1121                 if (send_data(port, dc)) {
1122                         writew(MDM_UL1, dc->reg_fcr);
1123                         dc->last_ier = dc->last_ier | MDM_UL;
1124                         writew(dc->last_ier, dc->reg_ier);
1125                         *toggle = !*toggle;
1126                 }
1127
1128                 if (read_iir & MDM_UL2) {
1129                         dc->last_ier &= ~MDM_UL;
1130                         writew(dc->last_ier, dc->reg_ier);
1131                         if (send_data(port, dc)) {
1132                                 writew(MDM_UL2, dc->reg_fcr);
1133                                 dc->last_ier = dc->last_ier | MDM_UL;
1134                                 writew(dc->last_ier, dc->reg_ier);
1135                                 *toggle = !*toggle;
1136                         }
1137                 }
1138
1139         } else if (*toggle == 1 && read_iir & MDM_UL2) {
1140                 dc->last_ier &= ~MDM_UL;
1141                 writew(dc->last_ier, dc->reg_ier);
1142                 if (send_data(port, dc)) {
1143                         writew(MDM_UL2, dc->reg_fcr);
1144                         dc->last_ier = dc->last_ier | MDM_UL;
1145                         writew(dc->last_ier, dc->reg_ier);
1146                         *toggle = !*toggle;
1147                 }
1148
1149                 if (read_iir & MDM_UL1) {
1150                         dc->last_ier &= ~MDM_UL;
1151                         writew(dc->last_ier, dc->reg_ier);
1152                         if (send_data(port, dc)) {
1153                                 writew(MDM_UL1, dc->reg_fcr);
1154                                 dc->last_ier = dc->last_ier | MDM_UL;
1155                                 writew(dc->last_ier, dc->reg_ier);
1156                                 *toggle = !*toggle;
1157                         }
1158                 }
1159         } else {
1160                 writew(read_iir & MDM_UL, dc->reg_fcr);
1161                 dev_err(&dc->pdev->dev, "port out of sync!\n");
1162                 return 0;
1163         }
1164         return 1;
1165 }
1166
1167 static irqreturn_t interrupt_handler(int irq, void *dev_id)
1168 {
1169         struct nozomi *dc = dev_id;
1170         unsigned int a;
1171         u16 read_iir;
1172
1173         if (!dc)
1174                 return IRQ_NONE;
1175
1176         spin_lock(&dc->spin_mutex);
1177         read_iir = readw(dc->reg_iir);
1178
1179         /* Card removed */
1180         if (read_iir == (u16)-1)
1181                 goto none;
1182         /*
1183          * Just handle interrupt enabled in IER
1184          * (by masking with dc->last_ier)
1185          */
1186         read_iir &= dc->last_ier;
1187
1188         if (read_iir == 0)
1189                 goto none;
1190
1191
1192         DBG4("%s irq:0x%04X, prev:0x%04X", interrupt2str(read_iir), read_iir,
1193                 dc->last_ier);
1194
1195         if (read_iir & RESET) {
1196                 if (unlikely(!nozomi_read_config_table(dc))) {
1197                         dc->last_ier = 0x0;
1198                         writew(dc->last_ier, dc->reg_ier);
1199                         dev_err(&dc->pdev->dev, "Could not read status from "
1200                                 "card, we should disable interface\n");
1201                 } else {
1202                         writew(RESET, dc->reg_fcr);
1203                 }
1204                 /* No more useful info if this was the reset interrupt. */
1205                 goto exit_handler;
1206         }
1207         if (read_iir & CTRL_UL) {
1208                 DBG1("CTRL_UL");
1209                 dc->last_ier &= ~CTRL_UL;
1210                 writew(dc->last_ier, dc->reg_ier);
1211                 if (send_flow_control(dc)) {
1212                         writew(CTRL_UL, dc->reg_fcr);
1213                         dc->last_ier = dc->last_ier | CTRL_UL;
1214                         writew(dc->last_ier, dc->reg_ier);
1215                 }
1216         }
1217         if (read_iir & CTRL_DL) {
1218                 receive_flow_control(dc);
1219                 writew(CTRL_DL, dc->reg_fcr);
1220         }
1221         if (read_iir & MDM_DL) {
1222                 if (!handle_data_dl(dc, PORT_MDM,
1223                                 &(dc->port[PORT_MDM].toggle_dl), read_iir,
1224                                 MDM_DL1, MDM_DL2)) {
1225                         dev_err(&dc->pdev->dev, "MDM_DL out of sync!\n");
1226                         goto exit_handler;
1227                 }
1228         }
1229         if (read_iir & MDM_UL) {
1230                 if (!handle_data_ul(dc, PORT_MDM, read_iir)) {
1231                         dev_err(&dc->pdev->dev, "MDM_UL out of sync!\n");
1232                         goto exit_handler;
1233                 }
1234         }
1235         if (read_iir & DIAG_DL) {
1236                 if (!handle_data_dl(dc, PORT_DIAG,
1237                                 &(dc->port[PORT_DIAG].toggle_dl), read_iir,
1238                                 DIAG_DL1, DIAG_DL2)) {
1239                         dev_err(&dc->pdev->dev, "DIAG_DL out of sync!\n");
1240                         goto exit_handler;
1241                 }
1242         }
1243         if (read_iir & DIAG_UL) {
1244                 dc->last_ier &= ~DIAG_UL;
1245                 writew(dc->last_ier, dc->reg_ier);
1246                 if (send_data(PORT_DIAG, dc)) {
1247                         writew(DIAG_UL, dc->reg_fcr);
1248                         dc->last_ier = dc->last_ier | DIAG_UL;
1249                         writew(dc->last_ier, dc->reg_ier);
1250                 }
1251         }
1252         if (read_iir & APP1_DL) {
1253                 if (receive_data(PORT_APP1, dc))
1254                         writew(APP1_DL, dc->reg_fcr);
1255         }
1256         if (read_iir & APP1_UL) {
1257                 dc->last_ier &= ~APP1_UL;
1258                 writew(dc->last_ier, dc->reg_ier);
1259                 if (send_data(PORT_APP1, dc)) {
1260                         writew(APP1_UL, dc->reg_fcr);
1261                         dc->last_ier = dc->last_ier | APP1_UL;
1262                         writew(dc->last_ier, dc->reg_ier);
1263                 }
1264         }
1265         if (read_iir & APP2_DL) {
1266                 if (receive_data(PORT_APP2, dc))
1267                         writew(APP2_DL, dc->reg_fcr);
1268         }
1269         if (read_iir & APP2_UL) {
1270                 dc->last_ier &= ~APP2_UL;
1271                 writew(dc->last_ier, dc->reg_ier);
1272                 if (send_data(PORT_APP2, dc)) {
1273                         writew(APP2_UL, dc->reg_fcr);
1274                         dc->last_ier = dc->last_ier | APP2_UL;
1275                         writew(dc->last_ier, dc->reg_ier);
1276                 }
1277         }
1278
1279 exit_handler:
1280         spin_unlock(&dc->spin_mutex);
1281         for (a = 0; a < NOZOMI_MAX_PORTS; a++) {
1282                 struct tty_struct *tty;
1283                 if (test_and_clear_bit(a, &dc->flip)) {
1284                         tty = tty_port_tty_get(&dc->port[a].port);
1285                         if (tty)
1286                                 tty_flip_buffer_push(tty);
1287                         tty_kref_put(tty);
1288                 }
1289         }
1290         return IRQ_HANDLED;
1291 none:
1292         spin_unlock(&dc->spin_mutex);
1293         return IRQ_NONE;
1294 }
1295
1296 static void nozomi_get_card_type(struct nozomi *dc)
1297 {
1298         int i;
1299         u32 size = 0;
1300
1301         for (i = 0; i < 6; i++)
1302                 size += pci_resource_len(dc->pdev, i);
1303
1304         /* Assume card type F32_8 if no match */
1305         dc->card_type = size == 2048 ? F32_2 : F32_8;
1306
1307         dev_info(&dc->pdev->dev, "Card type is: %d\n", dc->card_type);
1308 }
1309
1310 static void nozomi_setup_private_data(struct nozomi *dc)
1311 {
1312         void __iomem *offset = dc->base_addr + dc->card_type / 2;
1313         unsigned int i;
1314
1315         dc->reg_fcr = (void __iomem *)(offset + R_FCR);
1316         dc->reg_iir = (void __iomem *)(offset + R_IIR);
1317         dc->reg_ier = (void __iomem *)(offset + R_IER);
1318         dc->last_ier = 0;
1319         dc->flip = 0;
1320
1321         dc->port[PORT_MDM].token_dl = MDM_DL;
1322         dc->port[PORT_DIAG].token_dl = DIAG_DL;
1323         dc->port[PORT_APP1].token_dl = APP1_DL;
1324         dc->port[PORT_APP2].token_dl = APP2_DL;
1325
1326         for (i = 0; i < MAX_PORT; i++)
1327                 init_waitqueue_head(&dc->port[i].tty_wait);
1328 }
1329
1330 static ssize_t card_type_show(struct device *dev, struct device_attribute *attr,
1331                           char *buf)
1332 {
1333         const struct nozomi *dc = pci_get_drvdata(to_pci_dev(dev));
1334
1335         return sprintf(buf, "%d\n", dc->card_type);
1336 }
1337 static DEVICE_ATTR(card_type, S_IRUGO, card_type_show, NULL);
1338
1339 static ssize_t open_ttys_show(struct device *dev, struct device_attribute *attr,
1340                           char *buf)
1341 {
1342         const struct nozomi *dc = pci_get_drvdata(to_pci_dev(dev));
1343
1344         return sprintf(buf, "%u\n", dc->open_ttys);
1345 }
1346 static DEVICE_ATTR(open_ttys, S_IRUGO, open_ttys_show, NULL);
1347
1348 static void make_sysfs_files(struct nozomi *dc)
1349 {
1350         if (device_create_file(&dc->pdev->dev, &dev_attr_card_type))
1351                 dev_err(&dc->pdev->dev,
1352                         "Could not create sysfs file for card_type\n");
1353         if (device_create_file(&dc->pdev->dev, &dev_attr_open_ttys))
1354                 dev_err(&dc->pdev->dev,
1355                         "Could not create sysfs file for open_ttys\n");
1356 }
1357
1358 static void remove_sysfs_files(struct nozomi *dc)
1359 {
1360         device_remove_file(&dc->pdev->dev, &dev_attr_card_type);
1361         device_remove_file(&dc->pdev->dev, &dev_attr_open_ttys);
1362 }
1363
1364 /* Allocate memory for one device */
1365 static int __devinit nozomi_card_init(struct pci_dev *pdev,
1366                                       const struct pci_device_id *ent)
1367 {
1368         resource_size_t start;
1369         int ret;
1370         struct nozomi *dc = NULL;
1371         int ndev_idx;
1372         int i;
1373
1374         dev_dbg(&pdev->dev, "Init, new card found\n");
1375
1376         for (ndev_idx = 0; ndev_idx < ARRAY_SIZE(ndevs); ndev_idx++)
1377                 if (!ndevs[ndev_idx])
1378                         break;
1379
1380         if (ndev_idx >= ARRAY_SIZE(ndevs)) {
1381                 dev_err(&pdev->dev, "no free tty range for this card left\n");
1382                 ret = -EIO;
1383                 goto err;
1384         }
1385
1386         dc = kzalloc(sizeof(struct nozomi), GFP_KERNEL);
1387         if (unlikely(!dc)) {
1388                 dev_err(&pdev->dev, "Could not allocate memory\n");
1389                 ret = -ENOMEM;
1390                 goto err_free;
1391         }
1392
1393         dc->pdev = pdev;
1394
1395         ret = pci_enable_device(dc->pdev);
1396         if (ret) {
1397                 dev_err(&pdev->dev, "Failed to enable PCI Device\n");
1398                 goto err_free;
1399         }
1400
1401         ret = pci_request_regions(dc->pdev, NOZOMI_NAME);
1402         if (ret) {
1403                 dev_err(&pdev->dev, "I/O address 0x%04x already in use\n",
1404                         (int) /* nozomi_private.io_addr */ 0);
1405                 goto err_disable_device;
1406         }
1407
1408         start = pci_resource_start(dc->pdev, 0);
1409         if (start == 0) {
1410                 dev_err(&pdev->dev, "No I/O address for card detected\n");
1411                 ret = -ENODEV;
1412                 goto err_rel_regs;
1413         }
1414
1415         /* Find out what card type it is */
1416         nozomi_get_card_type(dc);
1417
1418         dc->base_addr = ioremap_nocache(start, dc->card_type);
1419         if (!dc->base_addr) {
1420                 dev_err(&pdev->dev, "Unable to map card MMIO\n");
1421                 ret = -ENODEV;
1422                 goto err_rel_regs;
1423         }
1424
1425         dc->send_buf = kmalloc(SEND_BUF_MAX, GFP_KERNEL);
1426         if (!dc->send_buf) {
1427                 dev_err(&pdev->dev, "Could not allocate send buffer?\n");
1428                 ret = -ENOMEM;
1429                 goto err_free_sbuf;
1430         }
1431
1432         for (i = PORT_MDM; i < MAX_PORT; i++) {
1433                 if (kfifo_alloc(&dc->port[i].fifo_ul,
1434                       FIFO_BUFFER_SIZE_UL, GFP_ATOMIC)) {
1435                         dev_err(&pdev->dev,
1436                                         "Could not allocate kfifo buffer\n");
1437                         ret = -ENOMEM;
1438                         goto err_free_kfifo;
1439                 }
1440         }
1441
1442         spin_lock_init(&dc->spin_mutex);
1443
1444         nozomi_setup_private_data(dc);
1445
1446         /* Disable all interrupts */
1447         dc->last_ier = 0;
1448         writew(dc->last_ier, dc->reg_ier);
1449
1450         ret = request_irq(pdev->irq, &interrupt_handler, IRQF_SHARED,
1451                         NOZOMI_NAME, dc);
1452         if (unlikely(ret)) {
1453                 dev_err(&pdev->dev, "can't request irq %d\n", pdev->irq);
1454                 goto err_free_kfifo;
1455         }
1456
1457         DBG1("base_addr: %p", dc->base_addr);
1458
1459         make_sysfs_files(dc);
1460
1461         dc->index_start = ndev_idx * MAX_PORT;
1462         ndevs[ndev_idx] = dc;
1463
1464         pci_set_drvdata(pdev, dc);
1465
1466         /* Enable RESET interrupt */
1467         dc->last_ier = RESET;
1468         iowrite16(dc->last_ier, dc->reg_ier);
1469
1470         dc->state = NOZOMI_STATE_ENABLED;
1471
1472         for (i = 0; i < MAX_PORT; i++) {
1473                 struct device *tty_dev;
1474                 struct port *port = &dc->port[i];
1475                 port->dc = dc;
1476                 mutex_init(&port->tty_sem);
1477                 tty_port_init(&port->port);
1478                 port->port.ops = &noz_tty_port_ops;
1479                 tty_dev = tty_register_device(ntty_driver, dc->index_start + i,
1480                                                         &pdev->dev);
1481
1482                 if (IS_ERR(tty_dev)) {
1483                         ret = PTR_ERR(tty_dev);
1484                         dev_err(&pdev->dev, "Could not allocate tty?\n");
1485                         goto err_free_tty;
1486                 }
1487         }
1488
1489         return 0;
1490
1491 err_free_tty:
1492         for (i = dc->index_start; i < dc->index_start + MAX_PORT; ++i)
1493                 tty_unregister_device(ntty_driver, i);
1494 err_free_kfifo:
1495         for (i = 0; i < MAX_PORT; i++)
1496                 kfifo_free(&dc->port[i].fifo_ul);
1497 err_free_sbuf:
1498         kfree(dc->send_buf);
1499         iounmap(dc->base_addr);
1500 err_rel_regs:
1501         pci_release_regions(pdev);
1502 err_disable_device:
1503         pci_disable_device(pdev);
1504 err_free:
1505         kfree(dc);
1506 err:
1507         return ret;
1508 }
1509
1510 static void __devexit tty_exit(struct nozomi *dc)
1511 {
1512         unsigned int i;
1513
1514         DBG1(" ");
1515
1516         flush_scheduled_work();
1517
1518         for (i = 0; i < MAX_PORT; ++i) {
1519                 struct tty_struct *tty = tty_port_tty_get(&dc->port[i].port);
1520                 if (tty && list_empty(&tty->hangup_work.entry))
1521                         tty_hangup(tty);
1522                 tty_kref_put(tty);
1523         }
1524         /* Racy below - surely should wait for scheduled work to be done or
1525            complete off a hangup method ? */
1526         while (dc->open_ttys)
1527                 msleep(1);
1528         for (i = dc->index_start; i < dc->index_start + MAX_PORT; ++i)
1529                 tty_unregister_device(ntty_driver, i);
1530 }
1531
1532 /* Deallocate memory for one device */
1533 static void __devexit nozomi_card_exit(struct pci_dev *pdev)
1534 {
1535         int i;
1536         struct ctrl_ul ctrl;
1537         struct nozomi *dc = pci_get_drvdata(pdev);
1538
1539         /* Disable all interrupts */
1540         dc->last_ier = 0;
1541         writew(dc->last_ier, dc->reg_ier);
1542
1543         tty_exit(dc);
1544
1545         /* Send 0x0001, command card to resend the reset token.  */
1546         /* This is to get the reset when the module is reloaded. */
1547         ctrl.port = 0x00;
1548         ctrl.reserved = 0;
1549         ctrl.RTS = 0;
1550         ctrl.DTR = 1;
1551         DBG1("sending flow control 0x%04X", *((u16 *)&ctrl));
1552
1553         /* Setup dc->reg addresses to we can use defines here */
1554         write_mem32(dc->port[PORT_CTRL].ul_addr[0], (u32 *)&ctrl, 2);
1555         writew(CTRL_UL, dc->reg_fcr);   /* push the token to the card. */
1556
1557         remove_sysfs_files(dc);
1558
1559         free_irq(pdev->irq, dc);
1560
1561         for (i = 0; i < MAX_PORT; i++)
1562                 kfifo_free(&dc->port[i].fifo_ul);
1563
1564         kfree(dc->send_buf);
1565
1566         iounmap(dc->base_addr);
1567
1568         pci_release_regions(pdev);
1569
1570         pci_disable_device(pdev);
1571
1572         ndevs[dc->index_start / MAX_PORT] = NULL;
1573
1574         kfree(dc);
1575 }
1576
1577 static void set_rts(const struct tty_struct *tty, int rts)
1578 {
1579         struct port *port = get_port_by_tty(tty);
1580
1581         port->ctrl_ul.RTS = rts;
1582         port->update_flow_control = 1;
1583         enable_transmit_ul(PORT_CTRL, get_dc_by_tty(tty));
1584 }
1585
1586 static void set_dtr(const struct tty_struct *tty, int dtr)
1587 {
1588         struct port *port = get_port_by_tty(tty);
1589
1590         DBG1("SETTING DTR index: %d, dtr: %d", tty->index, dtr);
1591
1592         port->ctrl_ul.DTR = dtr;
1593         port->update_flow_control = 1;
1594         enable_transmit_ul(PORT_CTRL, get_dc_by_tty(tty));
1595 }
1596
1597 /*
1598  * ----------------------------------------------------------------------------
1599  * TTY code
1600  * ----------------------------------------------------------------------------
1601  */
1602
1603 static int ntty_install(struct tty_driver *driver, struct tty_struct *tty)
1604 {
1605         struct port *port = get_port_by_tty(tty);
1606         struct nozomi *dc = get_dc_by_tty(tty);
1607         int ret;
1608         if (!port || !dc || dc->state != NOZOMI_STATE_READY)
1609                 return -ENODEV;
1610         ret = tty_init_termios(tty);
1611         if (ret == 0) {
1612                 tty_driver_kref_get(driver);
1613                 driver->ttys[tty->index] = tty;
1614         }
1615         return ret;
1616 }
1617
1618 static void ntty_cleanup(struct tty_struct *tty)
1619 {
1620         tty->driver_data = NULL;
1621 }
1622
1623 static int ntty_activate(struct tty_port *tport, struct tty_struct *tty)
1624 {
1625         struct port *port = container_of(tport, struct port, port);
1626         struct nozomi *dc = port->dc;
1627         unsigned long flags;
1628
1629         DBG1("open: %d", port->token_dl);
1630         spin_lock_irqsave(&dc->spin_mutex, flags);
1631         dc->last_ier = dc->last_ier | port->token_dl;
1632         writew(dc->last_ier, dc->reg_ier);
1633         dc->open_ttys++;
1634         spin_unlock_irqrestore(&dc->spin_mutex, flags);
1635         printk("noz: activated %d: %p\n", tty->index, tport);
1636         return 0;
1637 }
1638
1639 static int ntty_open(struct tty_struct *tty, struct file *filp)
1640 {
1641         struct port *port = get_port_by_tty(tty);
1642         return tty_port_open(&port->port, tty, filp);
1643 }
1644
1645 static void ntty_shutdown(struct tty_port *tport)
1646 {
1647         struct port *port = container_of(tport, struct port, port);
1648         struct nozomi *dc = port->dc;
1649         unsigned long flags;
1650
1651         DBG1("close: %d", port->token_dl);
1652         spin_lock_irqsave(&dc->spin_mutex, flags);
1653         dc->last_ier &= ~(port->token_dl);
1654         writew(dc->last_ier, dc->reg_ier);
1655         dc->open_ttys--;
1656         spin_unlock_irqrestore(&dc->spin_mutex, flags);
1657         printk("noz: shutdown %p\n", tport);
1658 }
1659
1660 static void ntty_close(struct tty_struct *tty, struct file *filp)
1661 {
1662         struct port *port = tty->driver_data;
1663         if (port)
1664                 tty_port_close(&port->port, tty, filp);
1665 }
1666
1667 static void ntty_hangup(struct tty_struct *tty)
1668 {
1669         struct port *port = tty->driver_data;
1670         tty_port_hangup(&port->port);
1671 }
1672
1673 /*
1674  * called when the userspace process writes to the tty (/dev/noz*).
1675  * Data is inserted into a fifo, which is then read and transfered to the modem.
1676  */
1677 static int ntty_write(struct tty_struct *tty, const unsigned char *buffer,
1678                       int count)
1679 {
1680         int rval = -EINVAL;
1681         struct nozomi *dc = get_dc_by_tty(tty);
1682         struct port *port = tty->driver_data;
1683         unsigned long flags;
1684
1685         /* DBG1( "WRITEx: %d, index = %d", count, index); */
1686
1687         if (!dc || !port)
1688                 return -ENODEV;
1689
1690         mutex_lock(&port->tty_sem);
1691
1692         if (unlikely(!port->port.count)) {
1693                 DBG1(" ");
1694                 goto exit;
1695         }
1696
1697         rval = kfifo_in(&port->fifo_ul, (unsigned char *)buffer, count);
1698
1699         /* notify card */
1700         if (unlikely(dc == NULL)) {
1701                 DBG1("No device context?");
1702                 goto exit;
1703         }
1704
1705         spin_lock_irqsave(&dc->spin_mutex, flags);
1706         /* CTS is only valid on the modem channel */
1707         if (port == &(dc->port[PORT_MDM])) {
1708                 if (port->ctrl_dl.CTS) {
1709                         DBG4("Enable interrupt");
1710                         enable_transmit_ul(tty->index % MAX_PORT, dc);
1711                 } else {
1712                         dev_err(&dc->pdev->dev,
1713                                 "CTS not active on modem port?\n");
1714                 }
1715         } else {
1716                 enable_transmit_ul(tty->index % MAX_PORT, dc);
1717         }
1718         spin_unlock_irqrestore(&dc->spin_mutex, flags);
1719
1720 exit:
1721         mutex_unlock(&port->tty_sem);
1722         return rval;
1723 }
1724
1725 /*
1726  * Calculate how much is left in device
1727  * This method is called by the upper tty layer.
1728  *   #according to sources N_TTY.c it expects a value >= 0 and
1729  *    does not check for negative values.
1730  *
1731  * If the port is unplugged report lots of room and let the bits
1732  * dribble away so we don't block anything.
1733  */
1734 static int ntty_write_room(struct tty_struct *tty)
1735 {
1736         struct port *port = tty->driver_data;
1737         int room = 4096;
1738         const struct nozomi *dc = get_dc_by_tty(tty);
1739
1740         if (dc) {
1741                 mutex_lock(&port->tty_sem);
1742                 if (port->port.count)
1743                         room = port->fifo_ul.size -
1744                                         kfifo_len(&port->fifo_ul);
1745                 mutex_unlock(&port->tty_sem);
1746         }
1747         return room;
1748 }
1749
1750 /* Gets io control parameters */
1751 static int ntty_tiocmget(struct tty_struct *tty, struct file *file)
1752 {
1753         const struct port *port = tty->driver_data;
1754         const struct ctrl_dl *ctrl_dl = &port->ctrl_dl;
1755         const struct ctrl_ul *ctrl_ul = &port->ctrl_ul;
1756
1757         /* Note: these could change under us but it is not clear this
1758            matters if so */
1759         return  (ctrl_ul->RTS ? TIOCM_RTS : 0) |
1760                 (ctrl_ul->DTR ? TIOCM_DTR : 0) |
1761                 (ctrl_dl->DCD ? TIOCM_CAR : 0) |
1762                 (ctrl_dl->RI  ? TIOCM_RNG : 0) |
1763                 (ctrl_dl->DSR ? TIOCM_DSR : 0) |
1764                 (ctrl_dl->CTS ? TIOCM_CTS : 0);
1765 }
1766
1767 /* Sets io controls parameters */
1768 static int ntty_tiocmset(struct tty_struct *tty, struct file *file,
1769         unsigned int set, unsigned int clear)
1770 {
1771         struct nozomi *dc = get_dc_by_tty(tty);
1772         unsigned long flags;
1773
1774         spin_lock_irqsave(&dc->spin_mutex, flags);
1775         if (set & TIOCM_RTS)
1776                 set_rts(tty, 1);
1777         else if (clear & TIOCM_RTS)
1778                 set_rts(tty, 0);
1779
1780         if (set & TIOCM_DTR)
1781                 set_dtr(tty, 1);
1782         else if (clear & TIOCM_DTR)
1783                 set_dtr(tty, 0);
1784         spin_unlock_irqrestore(&dc->spin_mutex, flags);
1785
1786         return 0;
1787 }
1788
1789 static int ntty_cflags_changed(struct port *port, unsigned long flags,
1790                 struct async_icount *cprev)
1791 {
1792         const struct async_icount cnow = port->tty_icount;
1793         int ret;
1794
1795         ret =   ((flags & TIOCM_RNG) && (cnow.rng != cprev->rng)) ||
1796                 ((flags & TIOCM_DSR) && (cnow.dsr != cprev->dsr)) ||
1797                 ((flags & TIOCM_CD)  && (cnow.dcd != cprev->dcd)) ||
1798                 ((flags & TIOCM_CTS) && (cnow.cts != cprev->cts));
1799
1800         *cprev = cnow;
1801
1802         return ret;
1803 }
1804
1805 static int ntty_ioctl_tiocgicount(struct port *port, void __user *argp)
1806 {
1807         const struct async_icount cnow = port->tty_icount;
1808         struct serial_icounter_struct icount;
1809
1810         icount.cts = cnow.cts;
1811         icount.dsr = cnow.dsr;
1812         icount.rng = cnow.rng;
1813         icount.dcd = cnow.dcd;
1814         icount.rx = cnow.rx;
1815         icount.tx = cnow.tx;
1816         icount.frame = cnow.frame;
1817         icount.overrun = cnow.overrun;
1818         icount.parity = cnow.parity;
1819         icount.brk = cnow.brk;
1820         icount.buf_overrun = cnow.buf_overrun;
1821
1822         return copy_to_user(argp, &icount, sizeof(icount)) ? -EFAULT : 0;
1823 }
1824
1825 static int ntty_ioctl(struct tty_struct *tty, struct file *file,
1826                       unsigned int cmd, unsigned long arg)
1827 {
1828         struct port *port = tty->driver_data;
1829         void __user *argp = (void __user *)arg;
1830         int rval = -ENOIOCTLCMD;
1831
1832         DBG1("******** IOCTL, cmd: %d", cmd);
1833
1834         switch (cmd) {
1835         case TIOCMIWAIT: {
1836                 struct async_icount cprev = port->tty_icount;
1837
1838                 rval = wait_event_interruptible(port->tty_wait,
1839                                 ntty_cflags_changed(port, arg, &cprev));
1840                 break;
1841         } case TIOCGICOUNT:
1842                 rval = ntty_ioctl_tiocgicount(port, argp);
1843                 break;
1844         default:
1845                 DBG1("ERR: 0x%08X, %d", cmd, cmd);
1846                 break;
1847         };
1848
1849         return rval;
1850 }
1851
1852 /*
1853  * Called by the upper tty layer when tty buffers are ready
1854  * to receive data again after a call to throttle.
1855  */
1856 static void ntty_unthrottle(struct tty_struct *tty)
1857 {
1858         struct nozomi *dc = get_dc_by_tty(tty);
1859         unsigned long flags;
1860
1861         DBG1("UNTHROTTLE");
1862         spin_lock_irqsave(&dc->spin_mutex, flags);
1863         enable_transmit_dl(tty->index % MAX_PORT, dc);
1864         set_rts(tty, 1);
1865
1866         spin_unlock_irqrestore(&dc->spin_mutex, flags);
1867 }
1868
1869 /*
1870  * Called by the upper tty layer when the tty buffers are almost full.
1871  * The driver should stop send more data.
1872  */
1873 static void ntty_throttle(struct tty_struct *tty)
1874 {
1875         struct nozomi *dc = get_dc_by_tty(tty);
1876         unsigned long flags;
1877
1878         DBG1("THROTTLE");
1879         spin_lock_irqsave(&dc->spin_mutex, flags);
1880         set_rts(tty, 0);
1881         spin_unlock_irqrestore(&dc->spin_mutex, flags);
1882 }
1883
1884 /* Returns number of chars in buffer, called by tty layer */
1885 static s32 ntty_chars_in_buffer(struct tty_struct *tty)
1886 {
1887         struct port *port = tty->driver_data;
1888         struct nozomi *dc = get_dc_by_tty(tty);
1889         s32 rval = 0;
1890
1891         if (unlikely(!dc || !port)) {
1892                 goto exit_in_buffer;
1893         }
1894
1895         if (unlikely(!port->port.count)) {
1896                 dev_err(&dc->pdev->dev, "No tty open?\n");
1897                 goto exit_in_buffer;
1898         }
1899
1900         rval = kfifo_len(&port->fifo_ul);
1901
1902 exit_in_buffer:
1903         return rval;
1904 }
1905
1906 static const struct tty_port_operations noz_tty_port_ops = {
1907         .activate = ntty_activate,
1908         .shutdown = ntty_shutdown,
1909 };
1910
1911 static const struct tty_operations tty_ops = {
1912         .ioctl = ntty_ioctl,
1913         .open = ntty_open,
1914         .close = ntty_close,
1915         .hangup = ntty_hangup,
1916         .write = ntty_write,
1917         .write_room = ntty_write_room,
1918         .unthrottle = ntty_unthrottle,
1919         .throttle = ntty_throttle,
1920         .chars_in_buffer = ntty_chars_in_buffer,
1921         .tiocmget = ntty_tiocmget,
1922         .tiocmset = ntty_tiocmset,
1923         .install = ntty_install,
1924         .cleanup = ntty_cleanup,
1925 };
1926
1927 /* Module initialization */
1928 static struct pci_driver nozomi_driver = {
1929         .name = NOZOMI_NAME,
1930         .id_table = nozomi_pci_tbl,
1931         .probe = nozomi_card_init,
1932         .remove = __devexit_p(nozomi_card_exit),
1933 };
1934
1935 static __init int nozomi_init(void)
1936 {
1937         int ret;
1938
1939         printk(KERN_INFO "Initializing %s\n", VERSION_STRING);
1940
1941         ntty_driver = alloc_tty_driver(NTTY_TTY_MAXMINORS);
1942         if (!ntty_driver)
1943                 return -ENOMEM;
1944
1945         ntty_driver->owner = THIS_MODULE;
1946         ntty_driver->driver_name = NOZOMI_NAME_TTY;
1947         ntty_driver->name = "noz";
1948         ntty_driver->major = 0;
1949         ntty_driver->type = TTY_DRIVER_TYPE_SERIAL;
1950         ntty_driver->subtype = SERIAL_TYPE_NORMAL;
1951         ntty_driver->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_DYNAMIC_DEV;
1952         ntty_driver->init_termios = tty_std_termios;
1953         ntty_driver->init_termios.c_cflag = B115200 | CS8 | CREAD | \
1954                                                 HUPCL | CLOCAL;
1955         ntty_driver->init_termios.c_ispeed = 115200;
1956         ntty_driver->init_termios.c_ospeed = 115200;
1957         tty_set_operations(ntty_driver, &tty_ops);
1958
1959         ret = tty_register_driver(ntty_driver);
1960         if (ret) {
1961                 printk(KERN_ERR "Nozomi: failed to register ntty driver\n");
1962                 goto free_tty;
1963         }
1964
1965         ret = pci_register_driver(&nozomi_driver);
1966         if (ret) {
1967                 printk(KERN_ERR "Nozomi: can't register pci driver\n");
1968                 goto unr_tty;
1969         }
1970
1971         return 0;
1972 unr_tty:
1973         tty_unregister_driver(ntty_driver);
1974 free_tty:
1975         put_tty_driver(ntty_driver);
1976         return ret;
1977 }
1978
1979 static __exit void nozomi_exit(void)
1980 {
1981         printk(KERN_INFO "Unloading %s\n", DRIVER_DESC);
1982         pci_unregister_driver(&nozomi_driver);
1983         tty_unregister_driver(ntty_driver);
1984         put_tty_driver(ntty_driver);
1985 }
1986
1987 module_init(nozomi_init);
1988 module_exit(nozomi_exit);
1989
1990 module_param(debug, int, S_IRUGO | S_IWUSR);
1991
1992 MODULE_LICENSE("Dual BSD/GPL");
1993 MODULE_DESCRIPTION(DRIVER_DESC);