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   1 /*
   2  * nozomi.c  -- HSDPA driver Broadband Wireless Data Card - Globe Trotter
   3  *
   4  * Written by: Ulf Jakobsson,
   5  *             Jan �erfeldt,
   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 /*
  42  * CHANGELOG
  43  * Version 2.1d
  44  * 11-November-2007 Jiri Slaby, Frank Seidel
  45  * - Big rework of multicard support by Jiri
  46  * - Major cleanups (semaphore to mutex, endianess, no major reservation)
  47  * - Optimizations
  48  *
  49  * Version 2.1c
  50  * 30-October-2007 Frank Seidel
  51  * - Completed multicard support
  52  * - Minor cleanups
  53  *
  54  * Version 2.1b
  55  * 07-August-2007 Frank Seidel
  56  * - Minor cleanups
  57  * - theoretical multicard support
  58  *
  59  * Version 2.1
  60  * 03-July-2006 Paul Hardwick
  61  *
  62  * - Stability Improvements. Incorporated spinlock wraps patch.
  63  * - Updated for newer 2.6.14+ kernels (tty_buffer_request_room)
  64  * - using __devexit macro for tty
  65  *
  66  *
  67  * Version 2.0
  68  * 08-feb-2006 15:34:10:Ulf
  69  *
  70  * -Fixed issue when not waking up line disipine layer, could probably result
  71  *  in better uplink performance for 2.4.
  72  *
  73  * -Fixed issue with big endian during initalization, now proper toggle flags
  74  *  are handled between preloader and maincode.
  75  *
  76  * -Fixed flow control issue.
  77  *
  78  * -Added support for setting DTR.
  79  *
  80  * -For 2.4 kernels, removing temporary buffer that's not needed.
  81  *
  82  * -Reading CTS only for modem port (only port that supports it).
  83  *
  84  * -Return 0 in write_room instead of netative value, it's not handled in
  85  *  upper layer.
  86  *
  87  * --------------------------------------------------------------------------
  88  * Version 1.0
  89  *
  90  * First version of driver, only tested with card of type F32_2.
  91  * Works fine with 2.4 and 2.6 kernels.
  92  * Driver also support big endian architecture.
  93  */
  94
  95 /* Enable this to have a lot of debug printouts */
  96 #define DEBUG
  97
  98 #include <linux/kernel.h>
  99 #include <linux/module.h>
 100 #include <linux/pci.h>
 101 #include <linux/ioport.h>
 102 #include <linux/tty.h>
 103 #include <linux/tty_driver.h>
 104 #include <linux/tty_flip.h>
 105 #include <linux/serial.h>
 106 #include <linux/interrupt.h>
 107 #include <linux/kmod.h>
 108 #include <linux/init.h>
 109 #include <linux/kfifo.h>
 110 #include <linux/uaccess.h>
 111 #include <asm/byteorder.h>
 112
 113 #include <linux/delay.h>
 114
 115
 116 #define VERSION_STRING DRIVER_DESC " 2.1d (build date: " \
 117                                         __DATE__ " " __TIME__ ")"
 118
 119 /*    Macros definitions */
 120
 121 /* Default debug printout level */
 122 #define NOZOMI_DEBUG_LEVEL 0x00
 123
 124 #define P_BUF_SIZE 128
 125 #define NFO(_err_flag_, args...)                                \
 126 do {                                                            \
 127         char tmp[P_BUF_SIZE];                                   \
 128         snprintf(tmp, sizeof(tmp), ##args);                     \
 129         printk(_err_flag_ "[%d] %s(): %s\n", __LINE__,          \
 130                 __FUNCTION__, tmp);                             \
 131 } while (0)
 132
 133 #define DBG1(args...) D_(0x01, ##args)
 134 #define DBG2(args...) D_(0x02, ##args)
 135 #define DBG3(args...) D_(0x04, ##args)
 136 #define DBG4(args...) D_(0x08, ##args)
 137 #define DBG5(args...) D_(0x10, ##args)
 138 #define DBG6(args...) D_(0x20, ##args)
 139 #define DBG7(args...) D_(0x40, ##args)
 140 #define DBG8(args...) D_(0x80, ##args)
 141
 142 #ifdef DEBUG
 143 /* Do we need this settable at runtime? */
 144 static int debug = NOZOMI_DEBUG_LEVEL;
 145
 146 #define D(lvl, args...)  do {if (lvl & debug) NFO(KERN_DEBUG, ##args); } \
 147                                 while (0)
 148 #define D_(lvl, args...) D(lvl, ##args)
 149
 150 /* These printouts are always printed */
 151
 152 #else
 153 static int debug;
 154 #define D_(lvl, args...)
 155 #endif
 156
 157 /* TODO: rewrite to optimize macros... */
 158
 159 #define TMP_BUF_MAX 256
 160
 161 #define DUMP(buf__,len__) \
 162   do {  \
 163     char tbuf[TMP_BUF_MAX] = {0};\
 164     if (len__ > 1) {\
 165         snprintf(tbuf, len__ > TMP_BUF_MAX ? TMP_BUF_MAX : len__, "%s", buf__);\
 166         if (tbuf[len__-2] == '\r') {\
 167                 tbuf[len__-2] = 'r';\
 168         } \
 169         DBG1("SENDING: '%s' (%d+n)", tbuf, len__);\
 170     } else {\
 171         DBG1("SENDING: '%s' (%d)", tbuf, len__);\
 172     } \
 173 } while (0)
 174
 175 /*    Defines */
 176 #define NOZOMI_NAME             "nozomi"
 177 #define NOZOMI_NAME_TTY         "nozomi_tty"
 178 #define DRIVER_DESC             "Nozomi driver"
 179
 180 #define NTTY_TTY_MAXMINORS      256
 181 #define NTTY_FIFO_BUFFER_SIZE   8192
 182
 183 /* Must be power of 2 */
 184 #define FIFO_BUFFER_SIZE_UL     8192
 185
 186 /* Size of tmp send buffer to card */
 187 #define SEND_BUF_MAX            1024
 188 #define RECEIVE_BUF_MAX         4
 189
 190
 191 /* Define all types of vendors and devices to support */
 192 #define VENDOR1         0x1931  /* Vendor Option */
 193 #define DEVICE1         0x000c  /* HSDPA card */
 194
 195 #define R_IIR           0x0000  /* Interrupt Identity Register */
 196 #define R_FCR           0x0000  /* Flow Control Register */
 197 #define R_IER           0x0004  /* Interrupt Enable Register */
 198
 199 #define CONFIG_MAGIC    0xEFEFFEFE
 200 #define TOGGLE_VALID    0x0000
 201
 202 /* Definition of interrupt tokens */
 203 #define MDM_DL1         0x0001
 204 #define MDM_UL1         0x0002
 205 #define MDM_DL2         0x0004
 206 #define MDM_UL2         0x0008
 207 #define DIAG_DL1        0x0010
 208 #define DIAG_DL2        0x0020
 209 #define DIAG_UL         0x0040
 210 #define APP1_DL         0x0080
 211 #define APP1_UL         0x0100
 212 #define APP2_DL         0x0200
 213 #define APP2_UL         0x0400
 214 #define CTRL_DL         0x0800
 215 #define CTRL_UL         0x1000
 216 #define RESET           0x8000
 217
 218 #define MDM_DL          (MDM_DL1  | MDM_DL2)
 219 #define MDM_UL          (MDM_UL1  | MDM_UL2)
 220 #define DIAG_DL         (DIAG_DL1 | DIAG_DL2)
 221
 222 /* modem signal definition */
 223 #define CTRL_DSR        0x0001
 224 #define CTRL_DCD        0x0002
 225 #define CTRL_RI         0x0004
 226 #define CTRL_CTS        0x0008
 227
 228 #define CTRL_DTR        0x0001
 229 #define CTRL_RTS        0x0002
 230
 231 #define MAX_PORT                4
 232 #define NOZOMI_MAX_PORTS        5
 233 #define NOZOMI_MAX_CARDS        (NTTY_TTY_MAXMINORS / MAX_PORT)
 234
 235 /*    Type definitions */
 236
 237 /*
 238  * There are two types of nozomi cards,
 239  * one with 2048 memory and with 8192 memory
 240  */
 241 enum card_type {
 242         F32_2 = 2048,   /* 512 bytes downlink + uplink * 2 -> 2048 */
 243         F32_8 = 8192,   /* 3072 bytes downl. + 1024 bytes uplink * 2 -> 8192 */
 244 };
 245
 246 /* Two different toggle channels exist */
 247 enum channel_type {
 248         CH_A = 0,
 249         CH_B = 1,
 250 };
 251
 252 /* Port definition for the card regarding flow control */
 253 enum ctrl_port_type {
 254         CTRL_CMD        = 0,
 255         CTRL_MDM        = 1,
 256         CTRL_DIAG       = 2,
 257         CTRL_APP1       = 3,
 258         CTRL_APP2       = 4,
 259         CTRL_ERROR      = -1,
 260 };
 261
 262 /* Ports that the nozomi has */
 263 enum port_type {
 264         PORT_MDM        = 0,
 265         PORT_DIAG       = 1,
 266         PORT_APP1       = 2,
 267         PORT_APP2       = 3,
 268         PORT_CTRL       = 4,
 269         PORT_ERROR      = -1,
 270 };
 271
 272 #ifdef __BIG_ENDIAN
 273 /* Big endian */
 274
 275 struct toggles {
 276         unsigned enabled:5;     /*
 277                                  * Toggle fields are valid if enabled is 0,
 278                                  * else A-channels must always be used.
 279                                  */
 280         unsigned diag_dl:1;
 281         unsigned mdm_dl:1;
 282         unsigned mdm_ul:1;
 283 } __attribute__ ((packed));
 284
 285 /* Configuration table to read at startup of card */
 286 /* Is for now only needed during initialization phase */
 287 struct config_table {
 288         u32 signature;
 289         u16 product_information;
 290         u16 version;
 291         u8 pad3[3];
 292         struct toggles toggle;
 293         u8 pad1[4];
 294         u16 dl_mdm_len1;        /*
 295                                  * If this is 64, it can hold
 296                                  * 60 bytes + 4 that is length field
 297                                  */
 298         u16 dl_start;
 299
 300         u16 dl_diag_len1;
 301         u16 dl_mdm_len2;        /*
 302                                  * If this is 64, it can hold
 303                                  * 60 bytes + 4 that is length field
 304                                  */
 305         u16 dl_app1_len;
 306
 307         u16 dl_diag_len2;
 308         u16 dl_ctrl_len;
 309         u16 dl_app2_len;
 310         u8 pad2[16];
 311         u16 ul_mdm_len1;
 312         u16 ul_start;
 313         u16 ul_diag_len;
 314         u16 ul_mdm_len2;
 315         u16 ul_app1_len;
 316         u16 ul_app2_len;
 317         u16 ul_ctrl_len;
 318 } __attribute__ ((packed));
 319
 320 /* This stores all control downlink flags */
 321 struct ctrl_dl {
 322         u8 port;
 323         unsigned reserved:4;
 324         unsigned CTS:1;
 325         unsigned RI:1;
 326         unsigned DCD:1;
 327         unsigned DSR:1;
 328 } __attribute__ ((packed));
 329
 330 /* This stores all control uplink flags */
 331 struct ctrl_ul {
 332         u8 port;
 333         unsigned reserved:6;
 334         unsigned RTS:1;
 335         unsigned DTR:1;
 336 } __attribute__ ((packed));
 337
 338 #else
 339 /* Little endian */
 340
 341 /* This represents the toggle information */
 342 struct toggles {
 343         unsigned mdm_ul:1;
 344         unsigned mdm_dl:1;
 345         unsigned diag_dl:1;
 346         unsigned enabled:5;     /*
 347                                  * Toggle fields are valid if enabled is 0,
 348                                  * else A-channels must always be used.
 349                                  */
 350 } __attribute__ ((packed));
 351
 352 /* Configuration table to read at startup of card */
 353 struct config_table {
 354         u32 signature;
 355         u16 version;
 356         u16 product_information;
 357         struct toggles toggle;
 358         u8 pad1[7];
 359         u16 dl_start;
 360         u16 dl_mdm_len1;        /*
 361                                  * If this is 64, it can hold
 362                                  * 60 bytes + 4 that is length field
 363                                  */
 364         u16 dl_mdm_len2;
 365         u16 dl_diag_len1;
 366         u16 dl_diag_len2;
 367         u16 dl_app1_len;
 368         u16 dl_app2_len;
 369         u16 dl_ctrl_len;
 370         u8 pad2[16];
 371         u16 ul_start;
 372         u16 ul_mdm_len2;
 373         u16 ul_mdm_len1;
 374         u16 ul_diag_len;
 375         u16 ul_app1_len;
 376         u16 ul_app2_len;
 377         u16 ul_ctrl_len;
 378 } __attribute__ ((packed));
 379
 380 /* This stores all control downlink flags */
 381 struct ctrl_dl {
 382         unsigned DSR:1;
 383         unsigned DCD:1;
 384         unsigned RI:1;
 385         unsigned CTS:1;
 386         unsigned reserverd:4;
 387         u8 port;
 388 } __attribute__ ((packed));
 389
 390 /* This stores all control uplink flags */
 391 struct ctrl_ul {
 392         unsigned DTR:1;
 393         unsigned RTS:1;
 394         unsigned reserved:6;
 395         u8 port;
 396 } __attribute__ ((packed));
 397 #endif
 398
 399 /* This holds all information that is needed regarding a port */
 400 struct port {
 401         u8 update_flow_control;
 402         struct ctrl_ul ctrl_ul;
 403         struct ctrl_dl ctrl_dl;
 404         struct kfifo *fifo_ul;
 405         void __iomem *dl_addr[2];
 406         u32 dl_size[2];
 407         u8 toggle_dl;
 408         void __iomem *ul_addr[2];
 409         u32 ul_size[2];
 410         u8 toggle_ul;
 411         u16 token_dl;
 412
 413         struct tty_struct *tty;
 414         int tty_open_count;
 415         /* mutex to ensure one access patch to this port */
 416         struct mutex tty_sem;
 417         wait_queue_head_t tty_wait;
 418         struct async_icount tty_icount;
 419 };
 420
 421 /* Private data one for each card in the system */
 422 struct nozomi {
 423         void __iomem *base_addr;
 424         unsigned long flip;
 425
 426         /* Pointers to registers */
 427         void __iomem *reg_iir;
 428         void __iomem *reg_fcr;
 429         void __iomem *reg_ier;
 430
 431         u16 last_ier;
 432         enum card_type card_type;
 433         struct config_table config_table;       /* Configuration table */
 434         struct pci_dev *pdev;
 435         struct port port[NOZOMI_MAX_PORTS];
 436         u8 *send_buf;
 437
 438         spinlock_t spin_mutex;  /* secures access to registers and tty */
 439
 440         unsigned int index_start;
 441         u32 open_ttys;
 442 };
 443
 444 /* This is a data packet that is read or written to/from card */
 445 struct buffer {
 446         u32 size;               /* size is the length of the data buffer */
 447         u8 *data;
 448 } __attribute__ ((packed));
 449
 450 /*    Global variables */
 451 static struct pci_device_id nozomi_pci_tbl[] = {
 452         {PCI_DEVICE(VENDOR1, DEVICE1)},
 453         {},
 454 };
 455
 456 MODULE_DEVICE_TABLE(pci, nozomi_pci_tbl);
 457
 458 static struct nozomi *ndevs[NOZOMI_MAX_CARDS];
 459 static struct tty_driver *ntty_driver;
 460
 461 /*
 462  * find card by tty_index
 463  */
 464 static inline struct nozomi *get_dc_by_tty(const struct tty_struct *tty)
 465 {
 466         return tty ? ndevs[tty->index / MAX_PORT] : NULL;
 467 }
 468
 469 static inline struct port *get_port_by_tty(const struct tty_struct *tty)
 470 {
 471         struct nozomi *ndev = get_dc_by_tty(tty);
 472         return ndev ? &ndev->port[tty->index % MAX_PORT] : NULL;
 473 }
 474
 475 /*
 476  * TODO:
 477  * -Optimize
 478  * -Rewrite cleaner
 479  */
 480
 481 static void read_mem32(u32 *buf, const void __iomem *mem_addr_start,
 482                         u32 size_bytes)
 483 {
 484         u32 i = 0;
 485         const u32 *ptr = (__force u32 *) mem_addr_start;
 486         u16 *buf16;
 487
 488         if (unlikely(!ptr || !buf))
 489                 goto out;
 490
 491         /* shortcut for extremely often used cases */
 492         switch (size_bytes) {
 493         case 2: /* 2 bytes */
 494                 buf16 = (u16 *) buf;
 495                 *buf16 = __le16_to_cpu(readw((void __iomem *)ptr));
 496                 goto out;
 497                 break;
 498         case 4: /* 4 bytes */
 499                 *(buf) = __le32_to_cpu(readl((void __iomem *)ptr));
 500                 goto out;
 501                 break;
 502         }
 503
 504         while (i < size_bytes) {
 505                 if (size_bytes - i == 2) {
 506                         /* Handle 2 bytes in the end */
 507                         buf16 = (u16 *) buf;
 508                         *(buf16) = __le16_to_cpu(readw((void __iomem *)ptr));
 509                         i += 2;
 510                 } else {
 511                         /* Read 4 bytes */
 512                         *(buf) = __le32_to_cpu(readl((void __iomem *)ptr));
 513                         i += 4;
 514                 }
 515                 buf++;
 516                 ptr++;
 517         }
 518 out:
 519         return;
 520 }
 521
 522 /*
 523  * TODO:
 524  * -Optimize
 525  * -Rewrite cleaner
 526  */
 527 static u32 write_mem32(void __iomem *mem_addr_start, u32 *buf,
 528                         u32 size_bytes)
 529 {
 530         u32 i = 0;
 531         u32 *ptr = (__force u32 *) mem_addr_start;
 532         u16 *buf16;
 533
 534         if (unlikely(!ptr || !buf))
 535                 return 0;
 536
 537         /* shortcut for extremely often used cases */
 538         switch (size_bytes) {
 539         case 2: /* 2 bytes */
 540                 buf16 = (u16 *) buf;
 541                 writew(__cpu_to_le16(*buf16), (void __iomem *)ptr);
 542                 return 2;
 543                 break;
 544         case 1: /*
 545                  * also needs to write 4 bytes in this case
 546                  * so falling through..
 547                  */
 548         case 4: /* 4 bytes */
 549                 writel(__cpu_to_le32(*buf), (void __iomem *)ptr);
 550                 return 4;
 551                 break;
 552         }
 553
 554         while (i < size_bytes) {
 555                 if (size_bytes - i == 2) {
 556                         /* 2 bytes */
 557                         buf16 = (u16 *) buf;
 558                         writew(__cpu_to_le16(*buf16), (void __iomem *)ptr);
 559                         i += 2;
 560                 } else {
 561                         /* 4 bytes */
 562                         writel(__cpu_to_le32(*buf), (void __iomem *)ptr);
 563                         i += 4;
 564                 }
 565                 buf++;
 566                 ptr++;
 567         }
 568         return i;
 569 }
 570
 571 /* Setup pointers to different channels and also setup buffer sizes. */
 572 static void setup_memory(struct nozomi *dc)
 573 {
 574         void __iomem *offset = dc->base_addr + dc->config_table.dl_start;
 575         /* The length reported is including the length field of 4 bytes,
 576          * hence subtract with 4.
 577          */
 578         const u16 buff_offset = 4;
 579
 580         /* Modem port dl configuration */
 581         dc->port[PORT_MDM].dl_addr[CH_A] = offset;
 582         dc->port[PORT_MDM].dl_addr[CH_B] =
 583                                 (offset += dc->config_table.dl_mdm_len1);
 584         dc->port[PORT_MDM].dl_size[CH_A] =
 585                                 dc->config_table.dl_mdm_len1 - buff_offset;
 586         dc->port[PORT_MDM].dl_size[CH_B] =
 587                                 dc->config_table.dl_mdm_len2 - buff_offset;
 588
 589         /* Diag port dl configuration */
 590         dc->port[PORT_DIAG].dl_addr[CH_A] =
 591                                 (offset += dc->config_table.dl_mdm_len2);
 592         dc->port[PORT_DIAG].dl_size[CH_A] =
 593                                 dc->config_table.dl_diag_len1 - buff_offset;
 594         dc->port[PORT_DIAG].dl_addr[CH_B] =
 595                                 (offset += dc->config_table.dl_diag_len1);
 596         dc->port[PORT_DIAG].dl_size[CH_B] =
 597                                 dc->config_table.dl_diag_len2 - buff_offset;
 598
 599         /* App1 port dl configuration */
 600         dc->port[PORT_APP1].dl_addr[CH_A] =
 601                                 (offset += dc->config_table.dl_diag_len2);
 602         dc->port[PORT_APP1].dl_size[CH_A] =
 603                                 dc->config_table.dl_app1_len - buff_offset;
 604
 605         /* App2 port dl configuration */
 606         dc->port[PORT_APP2].dl_addr[CH_A] =
 607                                 (offset += dc->config_table.dl_app1_len);
 608         dc->port[PORT_APP2].dl_size[CH_A] =
 609                                 dc->config_table.dl_app2_len - buff_offset;
 610
 611         /* Ctrl dl configuration */
 612         dc->port[PORT_CTRL].dl_addr[CH_A] =
 613                                 (offset += dc->config_table.dl_app2_len);
 614         dc->port[PORT_CTRL].dl_size[CH_A] =
 615                                 dc->config_table.dl_ctrl_len - buff_offset;
 616
 617         offset = dc->base_addr + dc->config_table.ul_start;
 618
 619         /* Modem Port ul configuration */
 620         dc->port[PORT_MDM].ul_addr[CH_A] = offset;
 621         dc->port[PORT_MDM].ul_size[CH_A] =
 622                                 dc->config_table.ul_mdm_len1 - buff_offset;
 623         dc->port[PORT_MDM].ul_addr[CH_B] =
 624                                 (offset += dc->config_table.ul_mdm_len1);
 625         dc->port[PORT_MDM].ul_size[CH_B] =
 626                                 dc->config_table.ul_mdm_len2 - buff_offset;
 627
 628         /* Diag port ul configuration */
 629         dc->port[PORT_DIAG].ul_addr[CH_A] =
 630                                 (offset += dc->config_table.ul_mdm_len2);
 631         dc->port[PORT_DIAG].ul_size[CH_A] =
 632                                 dc->config_table.ul_diag_len - buff_offset;
 633
 634         /* App1 port ul configuration */
 635         dc->port[PORT_APP1].ul_addr[CH_A] =
 636                                 (offset += dc->config_table.ul_diag_len);
 637         dc->port[PORT_APP1].ul_size[CH_A] =
 638                                 dc->config_table.ul_app1_len - buff_offset;
 639
 640         /* App2 port ul configuration */
 641         dc->port[PORT_APP2].ul_addr[CH_A] =
 642                                 (offset += dc->config_table.ul_app1_len);
 643         dc->port[PORT_APP2].ul_size[CH_A] =
 644                                 dc->config_table.ul_app2_len - buff_offset;
 645
 646         /* Ctrl ul configuration */
 647         dc->port[PORT_CTRL].ul_addr[CH_A] =
 648                                 (offset += dc->config_table.ul_app2_len);
 649         dc->port[PORT_CTRL].ul_size[CH_A] =
 650                                 dc->config_table.ul_ctrl_len - buff_offset;
 651 }
 652
 653 /* Dump config table under initalization phase */
 654 #ifdef DEBUG
 655 static void dump_table(const struct nozomi *dc)
 656 {
 657         DBG3("signature: 0x%08X", dc->config_table.signature);
 658         DBG3("version: 0x%04X", dc->config_table.version);
 659         DBG3("product_information: 0x%04X", \
 660                                 dc->config_table.product_information);
 661         DBG3("toggle enabled: %d", dc->config_table.toggle.enabled);
 662         DBG3("toggle up_mdm: %d", dc->config_table.toggle.mdm_ul);
 663         DBG3("toggle dl_mdm: %d", dc->config_table.toggle.mdm_dl);
 664         DBG3("toggle dl_dbg: %d", dc->config_table.toggle.diag_dl);
 665
 666         DBG3("dl_start: 0x%04X", dc->config_table.dl_start);
 667         DBG3("dl_mdm_len0: 0x%04X, %d", dc->config_table.dl_mdm_len1,
 668            dc->config_table.dl_mdm_len1);
 669         DBG3("dl_mdm_len1: 0x%04X, %d", dc->config_table.dl_mdm_len2,
 670            dc->config_table.dl_mdm_len2);
 671         DBG3("dl_diag_len0: 0x%04X, %d", dc->config_table.dl_diag_len1,
 672            dc->config_table.dl_diag_len1);
 673         DBG3("dl_diag_len1: 0x%04X, %d", dc->config_table.dl_diag_len2,
 674            dc->config_table.dl_diag_len2);
 675         DBG3("dl_app1_len: 0x%04X, %d", dc->config_table.dl_app1_len,
 676            dc->config_table.dl_app1_len);
 677         DBG3("dl_app2_len: 0x%04X, %d", dc->config_table.dl_app2_len,
 678            dc->config_table.dl_app2_len);
 679         DBG3("dl_ctrl_len: 0x%04X, %d", dc->config_table.dl_ctrl_len,
 680            dc->config_table.dl_ctrl_len);
 681         DBG3("ul_start: 0x%04X, %d", dc->config_table.ul_start,
 682            dc->config_table.ul_start);
 683         DBG3("ul_mdm_len[0]: 0x%04X, %d", dc->config_table.ul_mdm_len1,
 684            dc->config_table.ul_mdm_len1);
 685         DBG3("ul_mdm_len[1]: 0x%04X, %d", dc->config_table.ul_mdm_len2,
 686            dc->config_table.ul_mdm_len2);
 687         DBG3("ul_diag_len: 0x%04X, %d", dc->config_table.ul_diag_len,
 688            dc->config_table.ul_diag_len);
 689         DBG3("ul_app1_len: 0x%04X, %d", dc->config_table.ul_app1_len,
 690            dc->config_table.ul_app1_len);
 691         DBG3("ul_app2_len: 0x%04X, %d", dc->config_table.ul_app2_len,
 692            dc->config_table.ul_app2_len);
 693         DBG3("ul_ctrl_len: 0x%04X, %d", dc->config_table.ul_ctrl_len,
 694            dc->config_table.ul_ctrl_len);
 695 }
 696 #else
 697 static __inline__ void dump_table(const struct nozomi *dc) { }
 698 #endif
 699
 700 /*
 701  * Read configuration table from card under intalization phase
 702  * Returns 1 if ok, else 0
 703  */
 704 static int nozomi_read_config_table(struct nozomi *dc)
 705 {
 706         read_mem32((u32 *) &dc->config_table, dc->base_addr + 0,
 707                                                 sizeof(struct config_table));
 708
 709         if (dc->config_table.signature != CONFIG_MAGIC) {
 710                 dev_err(&dc->pdev->dev, "ConfigTable Bad! 0x%08X != 0x%08X\n",
 711                         dc->config_table.signature, CONFIG_MAGIC);
 712                 return 0;
 713         }
 714
 715         if ((dc->config_table.version == 0)
 716             || (dc->config_table.toggle.enabled == TOGGLE_VALID)) {
 717                 int i;
 718                 DBG1("Second phase, configuring card");
 719
 720                 setup_memory(dc);
 721
 722                 dc->port[PORT_MDM].toggle_ul = dc->config_table.toggle.mdm_ul;
 723                 dc->port[PORT_MDM].toggle_dl = dc->config_table.toggle.mdm_dl;
 724                 dc->port[PORT_DIAG].toggle_dl = dc->config_table.toggle.diag_dl;
 725                 DBG1("toggle ports: MDM UL:%d MDM DL:%d, DIAG DL:%d",
 726                    dc->port[PORT_MDM].toggle_ul,
 727                    dc->port[PORT_MDM].toggle_dl, dc->port[PORT_DIAG].toggle_dl);
 728
 729                 dump_table(dc);
 730
 731                 for (i = PORT_MDM; i < MAX_PORT; i++) {
 732                         dc->port[i].fifo_ul =
 733                             kfifo_alloc(FIFO_BUFFER_SIZE_UL, GFP_ATOMIC, NULL);
 734                         memset(&dc->port[i].ctrl_dl, 0, sizeof(struct ctrl_dl));
 735                         memset(&dc->port[i].ctrl_ul, 0, sizeof(struct ctrl_ul));
 736                 }
 737
 738                 /* Enable control channel */
 739                 dc->last_ier = dc->last_ier | CTRL_DL;
 740                 writew(dc->last_ier, dc->reg_ier);
 741
 742                 dev_info(&dc->pdev->dev, "Initialization OK!\n");
 743                 return 1;
 744         }
 745
 746         if ((dc->config_table.version > 0)
 747             && (dc->config_table.toggle.enabled != TOGGLE_VALID)) {
 748                 u32 offset = 0;
 749                 DBG1("First phase: pushing upload buffers, clearing download");
 750
 751                 dev_info(&dc->pdev->dev, "Version of card: %d\n",
 752                          dc->config_table.version);
 753
 754                 /* Here we should disable all I/O over F32. */
 755                 setup_memory(dc);
 756
 757                 /*
 758                  * We should send ALL channel pair tokens back along
 759                  * with reset token
 760                  */
 761
 762                 /* push upload modem buffers */
 763                 write_mem32(dc->port[PORT_MDM].ul_addr[CH_A],
 764                         (u32 *) &offset, 4);
 765                 write_mem32(dc->port[PORT_MDM].ul_addr[CH_B],
 766                         (u32 *) &offset, 4);
 767
 768                 writew(MDM_UL | DIAG_DL | MDM_DL, dc->reg_fcr);
 769
 770                 DBG1("First phase done");
 771         }
 772
 773         return 1;
 774 }
 775
 776 /* Enable uplink interrupts  */
 777 static void enable_transmit_ul(enum port_type port, struct nozomi *dc)
 778 {
 779         u16 mask[NOZOMI_MAX_PORTS] = \
 780                         {MDM_UL, DIAG_UL, APP1_UL, APP2_UL, CTRL_UL};
 781
 782         if (port < NOZOMI_MAX_PORTS) {
 783                 dc->last_ier |= mask[port];
 784                 writew(dc->last_ier, dc->reg_ier);
 785         } else {
 786                 dev_err(&dc->pdev->dev, "Called with wrong port?\n");
 787         }
 788 }
 789
 790 /* Disable uplink interrupts  */
 791 static void disable_transmit_ul(enum port_type port, struct nozomi *dc)
 792 {
 793         u16 mask[NOZOMI_MAX_PORTS] = \
 794                         {~MDM_UL, ~DIAG_UL, ~APP1_UL, ~APP2_UL, ~CTRL_UL};
 795
 796         if (port < NOZOMI_MAX_PORTS) {
 797                 dc->last_ier &= mask[port];
 798                 writew(dc->last_ier, dc->reg_ier);
 799         } else {
 800                 dev_err(&dc->pdev->dev, "Called with wrong port?\n");
 801         }
 802 }
 803
 804 /* Enable downlink interrupts */
 805 static void enable_transmit_dl(enum port_type port, struct nozomi *dc)
 806 {
 807         u16 mask[NOZOMI_MAX_PORTS] = \
 808                         {MDM_DL, DIAG_DL, APP1_DL, APP2_DL, CTRL_DL};
 809
 810         if (port < NOZOMI_MAX_PORTS) {
 811                 dc->last_ier |= mask[port];
 812                 writew(dc->last_ier, dc->reg_ier);
 813         } else {
 814                 dev_err(&dc->pdev->dev, "Called with wrong port?\n");
 815         }
 816 }
 817
 818 /* Disable downlink interrupts */
 819 static void disable_transmit_dl(enum port_type port, struct nozomi *dc)
 820 {
 821         u16 mask[NOZOMI_MAX_PORTS] = \
 822                         {~MDM_DL, ~DIAG_DL, ~APP1_DL, ~APP2_DL, ~CTRL_DL};
 823
 824         if (port < NOZOMI_MAX_PORTS) {
 825                 dc->last_ier &= mask[port];
 826                 writew(dc->last_ier, dc->reg_ier);
 827         } else {
 828                 dev_err(&dc->pdev->dev, "Called with wrong port?\n");
 829         }
 830 }
 831
 832 /*
 833  * Return 1 - send buffer to card and ack.
 834  * Return 0 - don't ack, don't send buffer to card.
 835  */
 836 static int send_data(enum port_type index, struct nozomi *dc)
 837 {
 838         u32 size = 0;
 839         struct port *port = &dc->port[index];
 840         u8 toggle = port->toggle_ul;
 841         void __iomem *addr = port->ul_addr[toggle];
 842         u32 ul_size = port->ul_size[toggle];
 843         struct tty_struct *tty = port->tty;
 844
 845         /* Get data from tty and place in buf for now */
 846         size = __kfifo_get(port->fifo_ul, dc->send_buf,
 847                            ul_size < SEND_BUF_MAX ? ul_size : SEND_BUF_MAX);
 848
 849         if (size == 0) {
 850                 DBG4("No more data to send, disable link:");
 851                 return 0;
 852         }
 853
 854         /* DUMP(buf, size); */
 855
 856         /* Write length + data */
 857         write_mem32(addr, (u32 *) &size, 4);
 858         write_mem32(addr + 4, (u32 *) dc->send_buf, size);
 859
 860         if (tty)
 861                 tty_wakeup(tty);
 862
 863         return 1;
 864 }
 865
 866 /* If all data has been read, return 1, else 0 */
 867 static int receive_data(enum port_type index, struct nozomi *dc)
 868 {
 869         u8 buf[RECEIVE_BUF_MAX] = { 0 };
 870         int size;
 871         u32 offset = 4;
 872         struct port *port = &dc->port[index];
 873         void __iomem *addr = port->dl_addr[port->toggle_dl];
 874         struct tty_struct *tty = port->tty;
 875         int i;
 876
 877         if (unlikely(!tty)) {
 878                 DBG1("tty not open for port: %d?", index);
 879                 return 1;
 880         }
 881
 882         read_mem32((u32 *) &size, addr, 4);
 883         /*  DBG1( "%d bytes port: %d", size, index); */
 884
 885         if (test_bit(TTY_THROTTLED, &tty->flags)) {
 886                 DBG1("No room in tty, don't read data, don't ack interrupt, "
 887                         "disable interrupt");
 888
 889                 /* disable interrupt in downlink... */
 890                 disable_transmit_dl(index, dc);
 891                 return 0;
 892         }
 893
 894         if (unlikely(size == 0)) {
 895                 dev_err(&dc->pdev->dev, "size == 0?\n");
 896                 return 1;
 897         }
 898
 899         tty_buffer_request_room(tty, size);
 900
 901         while (size > 0) {
 902                 read_mem32((u32 *) buf, addr + offset, RECEIVE_BUF_MAX);
 903
 904                 if (size == 1) {
 905                         tty_insert_flip_char(tty, buf[0], TTY_NORMAL);
 906                         size = 0;
 907                 } else if (size < RECEIVE_BUF_MAX) {
 908                         size -= tty_insert_flip_string(tty, (char *) buf, size);
 909                 } else {
 910                         i = tty_insert_flip_string(tty, \
 911                                                 (char *) buf, RECEIVE_BUF_MAX);
 912                         size -= i;
 913                         offset += i;
 914                 }
 915         }
 916
 917         set_bit(index, &dc->flip);
 918
 919         return 1;
 920 }
 921
 922 /* Debug for interrupts */
 923 #ifdef DEBUG
 924 static char *interrupt2str(u16 interrupt)
 925 {
 926         static char buf[TMP_BUF_MAX];
 927         char *p = buf;
 928
 929         interrupt & MDM_DL1 ? p += snprintf(p, TMP_BUF_MAX, "MDM_DL1 ") : NULL;
 930         interrupt & MDM_DL2 ? p += snprintf(p, TMP_BUF_MAX - (p - buf),
 931                                         "MDM_DL2 ") : NULL;
 932
 933         interrupt & MDM_UL1 ? p += snprintf(p, TMP_BUF_MAX - (p - buf),
 934                                         "MDM_UL1 ") : NULL;
 935         interrupt & MDM_UL2 ? p += snprintf(p, TMP_BUF_MAX - (p - buf),
 936                                         "MDM_UL2 ") : NULL;
 937
 938         interrupt & DIAG_DL1 ? p += snprintf(p, TMP_BUF_MAX - (p - buf),
 939                                         "DIAG_DL1 ") : NULL;
 940         interrupt & DIAG_DL2 ? p += snprintf(p, TMP_BUF_MAX - (p - buf),
 941                                         "DIAG_DL2 ") : NULL;
 942
 943         interrupt & DIAG_UL ? p += snprintf(p, TMP_BUF_MAX - (p - buf),
 944                                         "DIAG_UL ") : NULL;
 945
 946         interrupt & APP1_DL ? p += snprintf(p, TMP_BUF_MAX - (p - buf),
 947                                         "APP1_DL ") : NULL;
 948         interrupt & APP2_DL ? p += snprintf(p, TMP_BUF_MAX - (p - buf),
 949                                         "APP2_DL ") : NULL;
 950
 951         interrupt & APP1_UL ? p += snprintf(p, TMP_BUF_MAX - (p - buf),
 952                                         "APP1_UL ") : NULL;
 953         interrupt & APP2_UL ? p += snprintf(p, TMP_BUF_MAX - (p - buf),
 954                                         "APP2_UL ") : NULL;
 955
 956         interrupt & CTRL_DL ? p += snprintf(p, TMP_BUF_MAX - (p - buf),
 957                                         "CTRL_DL ") : NULL;
 958         interrupt & CTRL_UL ? p += snprintf(p, TMP_BUF_MAX - (p - buf),
 959                                         "CTRL_UL ") : NULL;
 960
 961         interrupt & RESET ? p += snprintf(p, TMP_BUF_MAX - (p - buf),
 962                                         "RESET ") : NULL;
 963
 964         return buf;
 965 }
 966 #endif
 967
 968 /*
 969  * Receive flow control
 970  * Return 1 - If ok, else 0
 971  */
 972 static int receive_flow_control(struct nozomi *dc)
 973 {
 974         enum port_type port = PORT_MDM;
 975         struct ctrl_dl ctrl_dl;
 976         struct ctrl_dl old_ctrl;
 977         u16 enable_ier = 0;
 978
 979         read_mem32((u32 *) &ctrl_dl, dc->port[PORT_CTRL].dl_addr[CH_A], 2);
 980
 981         switch (ctrl_dl.port) {
 982         case CTRL_CMD:
 983                 DBG1("The Base Band sends this value as a response to a "
 984                         "request for IMSI detach sent over the control "
 985                         "channel uplink (see section 7.6.1).");
 986                 break;
 987         case CTRL_MDM:
 988                 port = PORT_MDM;
 989                 enable_ier = MDM_DL;
 990                 break;
 991         case CTRL_DIAG:
 992                 port = PORT_DIAG;
 993                 enable_ier = DIAG_DL;
 994                 break;
 995         case CTRL_APP1:
 996                 port = PORT_APP1;
 997                 enable_ier = APP1_DL;
 998                 break;
 999         case CTRL_APP2:
1000                 port = PORT_APP2;
1001                 enable_ier = APP2_DL;
1002                 break;
1003         default:
1004                 dev_err(&dc->pdev->dev,
1005                         "ERROR: flow control received for non-existing port\n");
1006                 return 0;
1007         };
1008
1009         DBG1("0x%04X->0x%04X", *((u16 *)&dc->port[port].ctrl_dl),
1010            *((u16 *)&ctrl_dl));
1011
1012         old_ctrl = dc->port[port].ctrl_dl;
1013         dc->port[port].ctrl_dl = ctrl_dl;
1014
1015         if (old_ctrl.CTS == 1 && ctrl_dl.CTS == 0) {
1016                 DBG1("Disable interrupt (0x%04X) on port: %d",
1017                         enable_ier, port);
1018                 disable_transmit_ul(port, dc);
1019
1020         } else if (old_ctrl.CTS == 0 && ctrl_dl.CTS == 1) {
1021
1022                 if (__kfifo_len(dc->port[port].fifo_ul)) {
1023                         DBG1("Enable interrupt (0x%04X) on port: %d",
1024                                 enable_ier, port);
1025                         DBG1("Data in buffer [%d], enable transmit! ",
1026                                 __kfifo_len(dc->port[port].fifo_ul));
1027                         enable_transmit_ul(port, dc);
1028                 } else {
1029                         DBG1("No data in buffer...");
1030                 }
1031         }
1032
1033         if (*(u16 *)&old_ctrl == *(u16 *)&ctrl_dl) {
1034                 DBG1(" No change in mctrl");
1035                 return 1;
1036         }
1037         /* Update statistics */
1038         if (old_ctrl.CTS != ctrl_dl.CTS)
1039                 dc->port[port].tty_icount.cts++;
1040         if (old_ctrl.DSR != ctrl_dl.DSR)
1041                 dc->port[port].tty_icount.dsr++;
1042         if (old_ctrl.RI != ctrl_dl.RI)
1043                 dc->port[port].tty_icount.rng++;
1044         if (old_ctrl.DCD != ctrl_dl.DCD)
1045                 dc->port[port].tty_icount.dcd++;
1046
1047         wake_up_interruptible(&dc->port[port].tty_wait);
1048
1049         DBG1("port: %d DCD(%d), CTS(%d), RI(%d), DSR(%d)",
1050            port,
1051            dc->port[port].tty_icount.dcd, dc->port[port].tty_icount.cts,
1052            dc->port[port].tty_icount.rng, dc->port[port].tty_icount.dsr);
1053
1054         return 1;
1055 }
1056
1057 static enum ctrl_port_type port2ctrl(enum port_type port,
1058                                         const struct nozomi *dc)
1059 {
1060         switch (port) {
1061         case PORT_MDM:
1062                 return CTRL_MDM;
1063         case PORT_DIAG:
1064                 return CTRL_DIAG;
1065         case PORT_APP1:
1066                 return CTRL_APP1;
1067         case PORT_APP2:
1068                 return CTRL_APP2;
1069         default:
1070                 dev_err(&dc->pdev->dev,
1071                         "ERROR: send flow control " \
1072                         "received for non-existing port\n");
1073         };
1074         return CTRL_ERROR;
1075 }
1076
1077 /*
1078  * Send flow control, can only update one channel at a time
1079  * Return 0 - If we have updated all flow control
1080  * Return 1 - If we need to update more flow control, ack current enable more
1081  */
1082 static int send_flow_control(struct nozomi *dc)
1083 {
1084         u32 i, more_flow_control_to_be_updated = 0;
1085         u16 *ctrl;
1086
1087         for (i = PORT_MDM; i < MAX_PORT; i++) {
1088                 if (dc->port[i].update_flow_control) {
1089                         if (more_flow_control_to_be_updated) {
1090                                 /* We have more flow control to be updated */
1091                                 return 1;
1092                         }
1093                         dc->port[i].ctrl_ul.port = port2ctrl(i, dc);
1094                         ctrl = (u16 *)&dc->port[i].ctrl_ul;
1095                         write_mem32(dc->port[PORT_CTRL].ul_addr[0], \
1096                                 (u32 *) ctrl, 2);
1097                         dc->port[i].update_flow_control = 0;
1098                         more_flow_control_to_be_updated = 1;
1099                 }
1100         }
1101         return 0;
1102 }
1103
1104 /*
1105  * Handle donlink data, ports that are handled are modem and diagnostics
1106  * Return 1 - ok
1107  * Return 0 - toggle fields are out of sync
1108  */
1109 static int handle_data_dl(struct nozomi *dc, enum port_type port, u8 *toggle,
1110                         u16 read_iir, u16 mask1, u16 mask2)
1111 {
1112         if (*toggle == 0 && read_iir & mask1) {
1113                 if (receive_data(port, dc)) {
1114                         writew(mask1, dc->reg_fcr);
1115                         *toggle = !(*toggle);
1116                 }
1117
1118                 if (read_iir & mask2) {
1119                         if (receive_data(port, dc)) {
1120                                 writew(mask2, dc->reg_fcr);
1121                                 *toggle = !(*toggle);
1122                         }
1123                 }
1124         } else if (*toggle == 1 && read_iir & mask2) {
1125                 if (receive_data(port, dc)) {
1126                         writew(mask2, dc->reg_fcr);
1127                         *toggle = !(*toggle);
1128                 }
1129
1130                 if (read_iir & mask1) {
1131                         if (receive_data(port, dc)) {
1132                                 writew(mask1, dc->reg_fcr);
1133                                 *toggle = !(*toggle);
1134                         }
1135                 }
1136         } else {
1137                 dev_err(&dc->pdev->dev, "port out of sync!, toggle:%d\n",
1138                         *toggle);
1139                 return 0;
1140         }
1141         return 1;
1142 }
1143
1144 /*
1145  * Handle uplink data, this is currently for the modem port
1146  * Return 1 - ok
1147  * Return 0 - toggle field are out of sync
1148  */
1149 static int handle_data_ul(struct nozomi *dc, enum port_type port, u16 read_iir)
1150 {
1151         u8 *toggle = &(dc->port[port].toggle_ul);
1152
1153         if (*toggle == 0 && read_iir & MDM_UL1) {
1154                 dc->last_ier &= ~MDM_UL;
1155                 writew(dc->last_ier, dc->reg_ier);
1156                 if (send_data(port, dc)) {
1157                         writew(MDM_UL1, dc->reg_fcr);
1158                         dc->last_ier = dc->last_ier | MDM_UL;
1159                         writew(dc->last_ier, dc->reg_ier);
1160                         *toggle = !*toggle;
1161                 }
1162
1163                 if (read_iir & MDM_UL2) {
1164                         dc->last_ier &= ~MDM_UL;
1165                         writew(dc->last_ier, dc->reg_ier);
1166                         if (send_data(port, dc)) {
1167                                 writew(MDM_UL2, dc->reg_fcr);
1168                                 dc->last_ier = dc->last_ier | MDM_UL;
1169                                 writew(dc->last_ier, dc->reg_ier);
1170                                 *toggle = !*toggle;
1171                         }
1172                 }
1173
1174         } else if (*toggle == 1 && read_iir & MDM_UL2) {
1175                 dc->last_ier &= ~MDM_UL;
1176                 writew(dc->last_ier, dc->reg_ier);
1177                 if (send_data(port, dc)) {
1178                         writew(MDM_UL2, dc->reg_fcr);
1179                         dc->last_ier = dc->last_ier | MDM_UL;
1180                         writew(dc->last_ier, dc->reg_ier);
1181                         *toggle = !*toggle;
1182                 }
1183
1184                 if (read_iir & MDM_UL1) {
1185                         dc->last_ier &= ~MDM_UL;
1186                         writew(dc->last_ier, dc->reg_ier);
1187                         if (send_data(port, dc)) {
1188                                 writew(MDM_UL1, dc->reg_fcr);
1189                                 dc->last_ier = dc->last_ier | MDM_UL;
1190                                 writew(dc->last_ier, dc->reg_ier);
1191                                 *toggle = !*toggle;
1192                         }
1193                 }
1194         } else {
1195                 writew(read_iir & MDM_UL, dc->reg_fcr);
1196                 dev_err(&dc->pdev->dev, "port out of sync!\n");
1197                 return 0;
1198         }
1199         return 1;
1200 }
1201
1202 static irqreturn_t interrupt_handler(int irq, void *dev_id)
1203 {
1204         struct nozomi *dc = dev_id;
1205         unsigned int a;
1206         u16 read_iir;
1207
1208         if (!dc)
1209                 return IRQ_NONE;
1210
1211         spin_lock(&dc->spin_mutex);
1212         read_iir = readw(dc->reg_iir);
1213
1214         /* Card removed */
1215         if (read_iir == (u16)-1)
1216                 goto none;
1217         /*
1218          * Just handle interrupt enabled in IER
1219          * (by masking with dc->last_ier)
1220          */
1221         read_iir &= dc->last_ier;
1222
1223         if (read_iir == 0)
1224                 goto none;
1225
1226
1227         DBG4("%s irq:0x%04X, prev:0x%04X", interrupt2str(read_iir), read_iir,
1228                 dc->last_ier);
1229
1230         if (read_iir & RESET) {
1231                 if (unlikely(!nozomi_read_config_table(dc))) {
1232                         dc->last_ier = 0x0;
1233                         writew(dc->last_ier, dc->reg_ier);
1234                         dev_err(&dc->pdev->dev, "Could not read status from "
1235                                 "card, we should disable interface\n");
1236                 } else {
1237                         writew(RESET, dc->reg_fcr);
1238                 }
1239                 /* No more useful info if this was the reset interrupt. */
1240                 goto exit_handler;
1241         }
1242         if (read_iir & CTRL_UL) {
1243                 DBG1("CTRL_UL");
1244                 dc->last_ier &= ~CTRL_UL;
1245                 writew(dc->last_ier, dc->reg_ier);
1246                 if (send_flow_control(dc)) {
1247                         writew(CTRL_UL, dc->reg_fcr);
1248                         dc->last_ier = dc->last_ier | CTRL_UL;
1249                         writew(dc->last_ier, dc->reg_ier);
1250                 }
1251         }
1252         if (read_iir & CTRL_DL) {
1253                 receive_flow_control(dc);
1254                 writew(CTRL_DL, dc->reg_fcr);
1255         }
1256         if (read_iir & MDM_DL) {
1257                 if (!handle_data_dl(dc, PORT_MDM,
1258                                 &(dc->port[PORT_MDM].toggle_dl), read_iir,
1259                                 MDM_DL1, MDM_DL2)) {
1260                         dev_err(&dc->pdev->dev, "MDM_DL out of sync!\n");
1261                         goto exit_handler;
1262                 }
1263         }
1264         if (read_iir & MDM_UL) {
1265                 if (!handle_data_ul(dc, PORT_MDM, read_iir)) {
1266                         dev_err(&dc->pdev->dev, "MDM_UL out of sync!\n");
1267                         goto exit_handler;
1268                 }
1269         }
1270         if (read_iir & DIAG_DL) {
1271                 if (!handle_data_dl(dc, PORT_DIAG,
1272                                 &(dc->port[PORT_DIAG].toggle_dl), read_iir,
1273                                 DIAG_DL1, DIAG_DL2)) {
1274                         dev_err(&dc->pdev->dev, "DIAG_DL out of sync!\n");
1275                         goto exit_handler;
1276                 }
1277         }
1278         if (read_iir & DIAG_UL) {
1279                 dc->last_ier &= ~DIAG_UL;
1280                 writew(dc->last_ier, dc->reg_ier);
1281                 if (send_data(PORT_DIAG, dc)) {
1282                         writew(DIAG_UL, dc->reg_fcr);
1283                         dc->last_ier = dc->last_ier | DIAG_UL;
1284                         writew(dc->last_ier, dc->reg_ier);
1285                 }
1286         }
1287         if (read_iir & APP1_DL) {
1288                 if (receive_data(PORT_APP1, dc))
1289                         writew(APP1_DL, dc->reg_fcr);
1290         }
1291         if (read_iir & APP1_UL) {
1292                 dc->last_ier &= ~APP1_UL;
1293                 writew(dc->last_ier, dc->reg_ier);
1294                 if (send_data(PORT_APP1, dc)) {
1295                         writew(APP1_UL, dc->reg_fcr);
1296                         dc->last_ier = dc->last_ier | APP1_UL;
1297                         writew(dc->last_ier, dc->reg_ier);
1298                 }
1299         }
1300         if (read_iir & APP2_DL) {
1301                 if (receive_data(PORT_APP2, dc))
1302                         writew(APP2_DL, dc->reg_fcr);
1303         }
1304         if (read_iir & APP2_UL) {
1305                 dc->last_ier &= ~APP2_UL;
1306                 writew(dc->last_ier, dc->reg_ier);
1307                 if (send_data(PORT_APP2, dc)) {
1308                         writew(APP2_UL, dc->reg_fcr);
1309                         dc->last_ier = dc->last_ier | APP2_UL;
1310                         writew(dc->last_ier, dc->reg_ier);
1311                 }
1312         }
1313
1314 exit_handler:
1315         spin_unlock(&dc->spin_mutex);
1316         for (a = 0; a < NOZOMI_MAX_PORTS; a++)
1317                 if (test_and_clear_bit(a, &dc->flip))
1318                         tty_flip_buffer_push(dc->port[a].tty);
1319         return IRQ_HANDLED;
1320 none:
1321         spin_unlock(&dc->spin_mutex);
1322         return IRQ_NONE;
1323 }
1324
1325 static void nozomi_get_card_type(struct nozomi *dc)
1326 {
1327         int i;
1328         u32 size = 0;
1329
1330         for (i = 0; i < 6; i++)
1331                 size += pci_resource_len(dc->pdev, i);
1332
1333         /* Assume card type F32_8 if no match */
1334         dc->card_type = size == 2048 ? F32_2 : F32_8;
1335
1336         dev_info(&dc->pdev->dev, "Card type is: %d\n", dc->card_type);
1337 }
1338
1339 static void nozomi_setup_private_data(struct nozomi *dc)
1340 {
1341         void __iomem *offset = dc->base_addr + dc->card_type / 2;
1342         unsigned int i;
1343
1344         dc->reg_fcr = (void __iomem *)(offset + R_FCR);
1345         dc->reg_iir = (void __iomem *)(offset + R_IIR);
1346         dc->reg_ier = (void __iomem *)(offset + R_IER);
1347         dc->last_ier = 0;
1348         dc->flip = 0;
1349
1350         dc->port[PORT_MDM].token_dl = MDM_DL;
1351         dc->port[PORT_DIAG].token_dl = DIAG_DL;
1352         dc->port[PORT_APP1].token_dl = APP1_DL;
1353         dc->port[PORT_APP2].token_dl = APP2_DL;
1354
1355         for (i = 0; i < MAX_PORT; i++)
1356                 init_waitqueue_head(&dc->port[i].tty_wait);
1357 }
1358
1359 static ssize_t card_type_show(struct device *dev, struct device_attribute *attr,
1360                           char *buf)
1361 {
1362         struct nozomi *dc = pci_get_drvdata(to_pci_dev(dev));
1363
1364         return sprintf(buf, "%d\n", dc->card_type);
1365 }
1366 static DEVICE_ATTR(card_type, 0444, card_type_show, NULL);
1367
1368 static ssize_t open_ttys_show(struct device *dev, struct device_attribute *attr,
1369                           char *buf)
1370 {
1371         struct nozomi *dc = pci_get_drvdata(to_pci_dev(dev));
1372
1373         return sprintf(buf, "%u\n", dc->open_ttys);
1374 }
1375 static DEVICE_ATTR(open_ttys, 0444, open_ttys_show, NULL);
1376
1377 static void make_sysfs_files(struct nozomi *dc)
1378 {
1379         if (device_create_file(&dc->pdev->dev, &dev_attr_card_type))
1380                 dev_err(&dc->pdev->dev,
1381                         "Could not create sysfs file for card_type\n");
1382         if (device_create_file(&dc->pdev->dev, &dev_attr_open_ttys))
1383                 dev_err(&dc->pdev->dev,
1384                         "Could not create sysfs file for open_ttys\n");
1385 }
1386
1387 static void remove_sysfs_files(struct nozomi *dc)
1388 {
1389         device_remove_file(&dc->pdev->dev, &dev_attr_card_type);
1390         device_remove_file(&dc->pdev->dev, &dev_attr_open_ttys);
1391 }
1392
1393 /* Allocate memory for one device */
1394 static int __devinit nozomi_card_init(struct pci_dev *pdev,
1395                                       const struct pci_device_id *ent)
1396 {
1397         resource_size_t start;
1398         int ret;
1399         struct nozomi *dc = NULL;
1400         int ndev_idx;
1401         int i;
1402
1403         dev_dbg(&pdev->dev, "Init, new card found\n");
1404
1405         for (ndev_idx = 0; ndev_idx < ARRAY_SIZE(ndevs); ndev_idx++)
1406                 if (!ndevs[ndev_idx])
1407                         break;
1408
1409         if (ndev_idx >= ARRAY_SIZE(ndevs)) {
1410                 dev_err(&pdev->dev, "no free tty range for this card left\n");
1411                 ret = -EIO;
1412                 goto err;
1413         }
1414
1415         dc = kzalloc(sizeof(struct nozomi), GFP_KERNEL);
1416         if (unlikely(!dc)) {
1417                 dev_err(&pdev->dev, "Could not allocate memory\n");
1418                 ret = -ENOMEM;
1419                 goto err_free;
1420         }
1421
1422         dc->pdev = pdev;
1423
1424         /* Find out what card type it is */
1425         nozomi_get_card_type(dc);
1426
1427         ret = pci_enable_device(dc->pdev);
1428         if (ret) {
1429                 dev_err(&pdev->dev, "Failed to enable PCI Device\n");
1430                 goto err_free;
1431         }
1432
1433         start = pci_resource_start(dc->pdev, 0);
1434         if (start == 0) {
1435                 dev_err(&pdev->dev, "No I/O address for card detected\n");
1436                 ret = -ENODEV;
1437                 goto err_disable_device;
1438         }
1439
1440         ret = pci_request_regions(dc->pdev, NOZOMI_NAME);
1441         if (ret) {
1442                 dev_err(&pdev->dev, "I/O address 0x%04x already in use\n",
1443                         (int) /* nozomi_private.io_addr */ 0);
1444                 goto err_disable_device;
1445         }
1446
1447         dc->base_addr = ioremap(start, dc->card_type);
1448         if (!dc->base_addr) {
1449                 dev_err(&pdev->dev, "Unable to map card MMIO\n");
1450                 ret = -ENODEV;
1451                 goto err_rel_regs;
1452         }
1453
1454         dc->send_buf = kmalloc(SEND_BUF_MAX, GFP_KERNEL);
1455         if (!dc->send_buf) {
1456                 dev_err(&pdev->dev, "Could not allocate send buffer?\n");
1457                 ret = -ENOMEM;
1458                 goto err_free_sbuf;
1459         }
1460
1461         spin_lock_init(&dc->spin_mutex);
1462
1463         nozomi_setup_private_data(dc);
1464
1465         /* Disable all interrupts */
1466         dc->last_ier = 0;
1467         writew(dc->last_ier, dc->reg_ier);
1468
1469         ret = request_irq(pdev->irq, &interrupt_handler, IRQF_SHARED,
1470                         NOZOMI_NAME, dc);
1471         if (unlikely(ret)) {
1472                 dev_err(&pdev->dev, "can't request irq %d\n", pdev->irq);
1473                 goto err_free_sbuf;
1474         }
1475
1476         DBG1("base_addr: %p", dc->base_addr);
1477
1478         make_sysfs_files(dc);
1479
1480         dc->index_start = ndev_idx * MAX_PORT;
1481         ndevs[ndev_idx] = dc;
1482
1483         for (i = 0; i < MAX_PORT; i++) {
1484                 mutex_init(&dc->port[i].tty_sem);
1485                 dc->port[i].tty_open_count = 0;
1486                 dc->port[i].tty = NULL;
1487                 tty_register_device(ntty_driver, dc->index_start + i,
1488                                                         &pdev->dev);
1489         }
1490
1491         /* Enable  RESET interrupt. */
1492         dc->last_ier = RESET;
1493         writew(dc->last_ier, dc->reg_ier);
1494
1495         pci_set_drvdata(pdev, dc);
1496
1497         return 0;
1498
1499 err_free_sbuf:
1500         kfree(dc->send_buf);
1501         iounmap(dc->base_addr);
1502 err_rel_regs:
1503         pci_release_regions(pdev);
1504 err_disable_device:
1505         pci_disable_device(pdev);
1506 err_free:
1507         kfree(dc);
1508 err:
1509         return ret;
1510 }
1511
1512 static void __devexit tty_exit(struct nozomi *dc)
1513 {
1514         unsigned int i;
1515
1516         DBG1(" ");
1517
1518         flush_scheduled_work();
1519
1520         for (i = 0; i < MAX_PORT; ++i)
1521                 if (dc->port[i].tty && \
1522                                 list_empty(&dc->port[i].tty->hangup_work.entry))
1523                         tty_hangup(dc->port[i].tty);
1524
1525         while (dc->open_ttys)
1526                 msleep(1);
1527
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                 if (dc->port[i].fifo_ul)
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 /* Called when the userspace process opens the tty, /dev/noz*.  */
1605 static int ntty_open(struct tty_struct *tty, struct file *file)
1606 {
1607         struct port *port = get_port_by_tty(tty);
1608         struct nozomi *dc = get_dc_by_tty(tty);
1609         unsigned long flags;
1610
1611         if (!port || !dc)
1612                 return -ENODEV;
1613
1614         if (mutex_lock_interruptible(&port->tty_sem))
1615                 return -ERESTARTSYS;
1616
1617         port->tty_open_count++;
1618         dc->open_ttys++;
1619
1620         /* Enable interrupt downlink for channel */
1621         if (port->tty_open_count == 1) {
1622                 tty->low_latency = 1;
1623                 tty->driver_data = port;
1624                 port->tty = tty;
1625                 DBG1("open: %d", port->token_dl);
1626                 spin_lock_irqsave(&dc->spin_mutex, flags);
1627                 dc->last_ier = dc->last_ier | port->token_dl;
1628                 writew(dc->last_ier, dc->reg_ier);
1629                 spin_unlock_irqrestore(&dc->spin_mutex, flags);
1630         }
1631
1632         mutex_unlock(&port->tty_sem);
1633
1634         return 0;
1635 }
1636
1637 /* Called when the userspace process close the tty, /dev/noz*. */
1638 static void ntty_close(struct tty_struct *tty, struct file *file)
1639 {
1640         struct nozomi *dc = get_dc_by_tty(tty);
1641         struct port *port = tty->driver_data;
1642         unsigned long flags;
1643
1644         if (!dc || !port)
1645                 return;
1646
1647         if (mutex_lock_interruptible(&port->tty_sem))
1648                 return;
1649
1650         if (!port->tty_open_count)
1651                 goto exit;
1652
1653         dc->open_ttys--;
1654         port->tty_open_count--;
1655
1656         if (port->tty_open_count == 0) {
1657                 DBG1("close: %d", port->token_dl);
1658                 spin_lock_irqsave(&dc->spin_mutex, flags);
1659                 dc->last_ier &= ~(port->token_dl);
1660                 writew(dc->last_ier, dc->reg_ier);
1661                 spin_unlock_irqrestore(&dc->spin_mutex, flags);
1662         }
1663
1664 exit:
1665         mutex_unlock(&port->tty_sem);
1666 }
1667
1668 /*
1669  * called when the userspace process writes to the tty (/dev/noz*).
1670  * Data is inserted into a fifo, which is then read and transfered to the modem.
1671  */
1672 static int ntty_write(struct tty_struct *tty, const unsigned char *buffer,
1673                       int count)
1674 {
1675         int rval = -EINVAL;
1676         struct nozomi *dc = get_dc_by_tty(tty);
1677         struct port *port = tty->driver_data;
1678         unsigned long flags;
1679
1680         /* DBG1( "WRITEx: %d, index = %d", count, index); */
1681
1682         if (!dc || !port)
1683                 return -ENODEV;
1684
1685         if (unlikely(!mutex_trylock(&port->tty_sem))) {
1686                 /*
1687                  * must test lock as tty layer wraps calls
1688                  * to this function with BKL
1689                  */
1690                 dev_err(&dc->pdev->dev, "Would have deadlocked - "
1691                         "return EAGAIN\n");
1692                 return -EAGAIN;
1693         }
1694
1695         if (unlikely(!port->tty_open_count)) {
1696                 DBG1(" ");
1697                 goto exit;
1698         }
1699
1700         rval = __kfifo_put(port->fifo_ul, (unsigned char *)buffer, count);
1701
1702         /* notify card */
1703         if (unlikely(dc == NULL)) {
1704                 DBG1("No device context?");
1705                 goto exit;
1706         }
1707
1708         spin_lock_irqsave(&dc->spin_mutex, flags);
1709         /* CTS is only valid on the modem channel */
1710         if (port == &(dc->port[PORT_MDM])) {
1711                 if (port->ctrl_dl.CTS) {
1712                         DBG4("Enable interrupt");
1713                         enable_transmit_ul(tty->index % MAX_PORT, dc);
1714                 } else {
1715                         dev_err(&dc->pdev->dev,
1716                                 "CTS not active on modem port?\n");
1717                 }
1718         } else {
1719                 enable_transmit_ul(tty->index % MAX_PORT, dc);
1720         }
1721         spin_unlock_irqrestore(&dc->spin_mutex, flags);
1722
1723 exit:
1724         mutex_unlock(&port->tty_sem);
1725         return rval;
1726 }
1727
1728 /*
1729  * Calculate how much is left in device
1730  * This method is called by the upper tty layer.
1731  *   #according to sources N_TTY.c it expects a value >= 0 and
1732  *    does not check for negative values.
1733  */
1734 static int ntty_write_room(struct tty_struct *tty)
1735 {
1736         struct port *port = tty->driver_data;
1737         int room = 0;
1738         struct nozomi *dc = get_dc_by_tty(tty);
1739
1740         if (!dc || !port)
1741                 return 0;
1742         if (!mutex_trylock(&port->tty_sem))
1743                 return 0;
1744
1745         if (!port->tty_open_count)
1746                 goto exit;
1747
1748         room = port->fifo_ul->size - __kfifo_len(port->fifo_ul);
1749
1750 exit:
1751         mutex_unlock(&port->tty_sem);
1752         return room;
1753 }
1754
1755 /* Gets io control parameters */
1756 static int ntty_tiocmget(struct tty_struct *tty, struct file *file)
1757 {
1758         struct port *port = tty->driver_data;
1759         struct ctrl_dl *ctrl_dl = &port->ctrl_dl;
1760         struct ctrl_ul *ctrl_ul = &port->ctrl_ul;
1761
1762         return  (ctrl_ul->RTS ? TIOCM_RTS : 0) |
1763                 (ctrl_ul->DTR ? TIOCM_DTR : 0) |
1764                 (ctrl_dl->DCD ? TIOCM_CAR : 0) |
1765                 (ctrl_dl->RI  ? TIOCM_RNG : 0) |
1766                 (ctrl_dl->DSR ? TIOCM_DSR : 0) |
1767                 (ctrl_dl->CTS ? TIOCM_CTS : 0);
1768 }
1769
1770 /* Sets io controls parameters */
1771 static int ntty_tiocmset(struct tty_struct *tty, struct file *file,
1772         unsigned int set, unsigned int clear)
1773 {
1774         if (set & TIOCM_RTS)
1775                 set_rts(tty, 1);
1776         else if (clear & TIOCM_RTS)
1777                 set_rts(tty, 0);
1778
1779         if (set & TIOCM_DTR)
1780                 set_dtr(tty, 1);
1781         else if (clear & TIOCM_DTR)
1782                 set_dtr(tty, 0);
1783
1784         return 0;
1785 }
1786
1787 static int ntty_cflags_changed(struct port *port, unsigned long flags,
1788                 struct async_icount *cprev)
1789 {
1790         struct async_icount cnow = port->tty_icount;
1791         int ret;
1792
1793         ret =   ((flags & TIOCM_RNG) && (cnow.rng != cprev->rng)) ||
1794                 ((flags & TIOCM_DSR) && (cnow.dsr != cprev->dsr)) ||
1795                 ((flags & TIOCM_CD)  && (cnow.dcd != cprev->dcd)) ||
1796                 ((flags & TIOCM_CTS) && (cnow.cts != cprev->cts));
1797
1798         *cprev = cnow;
1799
1800         return ret;
1801 }
1802
1803 static int ntty_ioctl_tiocgicount(struct port *port, void __user *argp)
1804 {
1805         struct async_icount cnow = port->tty_icount;
1806         struct serial_icounter_struct icount;
1807
1808         icount.cts = cnow.cts;
1809         icount.dsr = cnow.dsr;
1810         icount.rng = cnow.rng;
1811         icount.dcd = cnow.dcd;
1812         icount.rx = cnow.rx;
1813         icount.tx = cnow.tx;
1814         icount.frame = cnow.frame;
1815         icount.overrun = cnow.overrun;
1816         icount.parity = cnow.parity;
1817         icount.brk = cnow.brk;
1818         icount.buf_overrun = cnow.buf_overrun;
1819
1820         return copy_to_user(argp, &icount, sizeof(icount));
1821 }
1822
1823 static int ntty_ioctl(struct tty_struct *tty, struct file *file,
1824                       unsigned int cmd, unsigned long arg)
1825 {
1826         struct port *port = tty->driver_data;
1827         void __user *argp = (void __user *)arg;
1828         int rval = -ENOIOCTLCMD;
1829
1830         DBG1("******** IOCTL, cmd: %d", cmd);
1831
1832         switch (cmd) {
1833         case TIOCMIWAIT: {
1834                 struct async_icount cprev = port->tty_icount;
1835
1836                 rval = wait_event_interruptible(port->tty_wait,
1837                                 ntty_cflags_changed(port, arg, &cprev));
1838                 break;
1839         } case TIOCGICOUNT:
1840                 rval = ntty_ioctl_tiocgicount(port, argp);
1841                 break;
1842         default:
1843                 DBG1("ERR: 0x%08X, %d", cmd, cmd);
1844                 break;
1845         };
1846
1847         return rval;
1848 }
1849
1850 /*
1851  * Called by the upper tty layer when tty buffers are ready
1852  * to receive data again after a call to throttle.
1853  */
1854 static void ntty_unthrottle(struct tty_struct *tty)
1855 {
1856         struct nozomi *dc = get_dc_by_tty(tty);
1857         unsigned long flags;
1858
1859         DBG1("UNTHROTTLE");
1860         spin_lock_irqsave(&dc->spin_mutex, flags);
1861         enable_transmit_dl(tty->index % MAX_PORT, dc);
1862         set_rts(tty, 1);
1863
1864         spin_unlock_irqrestore(&dc->spin_mutex, flags);
1865 }
1866
1867 /*
1868  * Called by the upper tty layer when the tty buffers are almost full.
1869  * The driver should stop send more data.
1870  */
1871 static void ntty_throttle(struct tty_struct *tty)
1872 {
1873         struct nozomi *dc = get_dc_by_tty(tty);
1874         unsigned long flags;
1875
1876         DBG1("THROTTLE");
1877         spin_lock_irqsave(&dc->spin_mutex, flags);
1878         set_rts(tty, 0);
1879         spin_unlock_irqrestore(&dc->spin_mutex, flags);
1880 }
1881
1882 /* just to discard single character writes */
1883 static void ntty_put_char(struct tty_struct *tty, unsigned char c)
1884 {
1885         /* FIXME !!! */
1886         DBG2("PUT CHAR Function: %c", c);
1887 }
1888
1889 /* Returns number of chars in buffer, called by tty layer */
1890 static s32 ntty_chars_in_buffer(struct tty_struct *tty)
1891 {
1892         struct port *port = tty->driver_data;
1893         struct nozomi *dc = get_dc_by_tty(tty);
1894         s32 rval;
1895
1896         if (unlikely(!dc || !port)) {
1897                 rval = -ENODEV;
1898                 goto exit_in_buffer;
1899         }
1900
1901         if (unlikely(!port->tty_open_count)) {
1902                 dev_err(&dc->pdev->dev, "No tty open?\n");
1903                 rval = -ENODEV;
1904                 goto exit_in_buffer;
1905         }
1906
1907         rval = __kfifo_len(port->fifo_ul);
1908
1909 exit_in_buffer:
1910         return rval;
1911 }
1912
1913 static struct tty_operations tty_ops = {
1914         .ioctl = ntty_ioctl,
1915         .open = ntty_open,
1916         .close = ntty_close,
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         .put_char = ntty_put_char,
1923         .tiocmget = ntty_tiocmget,
1924         .tiocmset = ntty_tiocmset,
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);