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 all types of vendors and devices to support */
 140 #define VENDOR1         0x1931  /* Vendor Option */
 141 #define DEVICE1         0x000c  /* HSDPA card */
 142
 143 #define R_IIR           0x0000  /* Interrupt Identity Register */
 144 #define R_FCR           0x0000  /* Flow Control Register */
 145 #define R_IER           0x0004  /* Interrupt Enable Register */
 146
 147 #define CONFIG_MAGIC    0xEFEFFEFE
 148 #define TOGGLE_VALID    0x0000
 149
 150 /* Definition of interrupt tokens */
 151 #define MDM_DL1         0x0001
 152 #define MDM_UL1         0x0002
 153 #define MDM_DL2         0x0004
 154 #define MDM_UL2         0x0008
 155 #define DIAG_DL1        0x0010
 156 #define DIAG_DL2        0x0020
 157 #define DIAG_UL         0x0040
 158 #define APP1_DL         0x0080
 159 #define APP1_UL         0x0100
 160 #define APP2_DL         0x0200
 161 #define APP2_UL         0x0400
 162 #define CTRL_DL         0x0800
 163 #define CTRL_UL         0x1000
 164 #define RESET           0x8000
 165
 166 #define MDM_DL          (MDM_DL1  | MDM_DL2)
 167 #define MDM_UL          (MDM_UL1  | MDM_UL2)
 168 #define DIAG_DL         (DIAG_DL1 | DIAG_DL2)
 169
 170 /* modem signal definition */
 171 #define CTRL_DSR        0x0001
 172 #define CTRL_DCD        0x0002
 173 #define CTRL_RI         0x0004
 174 #define CTRL_CTS        0x0008
 175
 176 #define CTRL_DTR        0x0001
 177 #define CTRL_RTS        0x0002
 178
 179 #define MAX_PORT                4
 180 #define NOZOMI_MAX_PORTS        5
 181 #define NOZOMI_MAX_CARDS        (NTTY_TTY_MAXMINORS / MAX_PORT)
 182
 183 /*    Type definitions */
 184
 185 /*
 186  * There are two types of nozomi cards,
 187  * one with 2048 memory and with 8192 memory
 188  */
 189 enum card_type {
 190         F32_2 = 2048,   /* 512 bytes downlink + uplink * 2 -> 2048 */
 191         F32_8 = 8192,   /* 3072 bytes downl. + 1024 bytes uplink * 2 -> 8192 */
 192 };
 193
 194 /* Initialization states a card can be in */
 195 enum card_state {
 196         NOZOMI_STATE_UKNOWN     = 0,
 197         NOZOMI_STATE_ENABLED    = 1,    /* pci device enabled */
 198         NOZOMI_STATE_ALLOCATED  = 2,    /* config setup done */
 199         NOZOMI_STATE_READY      = 3,    /* flowcontrols received */
 200 };
 201
 202 /* Two different toggle channels exist */
 203 enum channel_type {
 204         CH_A = 0,
 205         CH_B = 1,
 206 };
 207
 208 /* Port definition for the card regarding flow control */
 209 enum ctrl_port_type {
 210         CTRL_CMD        = 0,
 211         CTRL_MDM        = 1,
 212         CTRL_DIAG       = 2,
 213         CTRL_APP1       = 3,
 214         CTRL_APP2       = 4,
 215         CTRL_ERROR      = -1,
 216 };
 217
 218 /* Ports that the nozomi has */
 219 enum port_type {
 220         PORT_MDM        = 0,
 221         PORT_DIAG       = 1,
 222         PORT_APP1       = 2,
 223         PORT_APP2       = 3,
 224         PORT_CTRL       = 4,
 225         PORT_ERROR      = -1,
 226 };
 227
 228 #ifdef __BIG_ENDIAN
 229 /* Big endian */
 230
 231 struct toggles {
 232         unsigned int enabled:5; /*
 233                                  * Toggle fields are valid if enabled is 0,
 234                                  * else A-channels must always be used.
 235                                  */
 236         unsigned int diag_dl:1;
 237         unsigned int mdm_dl:1;
 238         unsigned int mdm_ul:1;
 239 } __attribute__ ((packed));
 240
 241 /* Configuration table to read at startup of card */
 242 /* Is for now only needed during initialization phase */
 243 struct config_table {
 244         u32 signature;
 245         u16 product_information;
 246         u16 version;
 247         u8 pad3[3];
 248         struct toggles toggle;
 249         u8 pad1[4];
 250         u16 dl_mdm_len1;        /*
 251                                  * If this is 64, it can hold
 252                                  * 60 bytes + 4 that is length field
 253                                  */
 254         u16 dl_start;
 255
 256         u16 dl_diag_len1;
 257         u16 dl_mdm_len2;        /*
 258                                  * If this is 64, it can hold
 259                                  * 60 bytes + 4 that is length field
 260                                  */
 261         u16 dl_app1_len;
 262
 263         u16 dl_diag_len2;
 264         u16 dl_ctrl_len;
 265         u16 dl_app2_len;
 266         u8 pad2[16];
 267         u16 ul_mdm_len1;
 268         u16 ul_start;
 269         u16 ul_diag_len;
 270         u16 ul_mdm_len2;
 271         u16 ul_app1_len;
 272         u16 ul_app2_len;
 273         u16 ul_ctrl_len;
 274 } __attribute__ ((packed));
 275
 276 /* This stores all control downlink flags */
 277 struct ctrl_dl {
 278         u8 port;
 279         unsigned int reserved:4;
 280         unsigned int CTS:1;
 281         unsigned int RI:1;
 282         unsigned int DCD:1;
 283         unsigned int DSR:1;
 284 } __attribute__ ((packed));
 285
 286 /* This stores all control uplink flags */
 287 struct ctrl_ul {
 288         u8 port;
 289         unsigned int reserved:6;
 290         unsigned int RTS:1;
 291         unsigned int DTR:1;
 292 } __attribute__ ((packed));
 293
 294 #else
 295 /* Little endian */
 296
 297 /* This represents the toggle information */
 298 struct toggles {
 299         unsigned int mdm_ul:1;
 300         unsigned int mdm_dl:1;
 301         unsigned int diag_dl:1;
 302         unsigned int enabled:5; /*
 303                                  * Toggle fields are valid if enabled is 0,
 304                                  * else A-channels must always be used.
 305                                  */
 306 } __attribute__ ((packed));
 307
 308 /* Configuration table to read at startup of card */
 309 struct config_table {
 310         u32 signature;
 311         u16 version;
 312         u16 product_information;
 313         struct toggles toggle;
 314         u8 pad1[7];
 315         u16 dl_start;
 316         u16 dl_mdm_len1;        /*
 317                                  * If this is 64, it can hold
 318                                  * 60 bytes + 4 that is length field
 319                                  */
 320         u16 dl_mdm_len2;
 321         u16 dl_diag_len1;
 322         u16 dl_diag_len2;
 323         u16 dl_app1_len;
 324         u16 dl_app2_len;
 325         u16 dl_ctrl_len;
 326         u8 pad2[16];
 327         u16 ul_start;
 328         u16 ul_mdm_len2;
 329         u16 ul_mdm_len1;
 330         u16 ul_diag_len;
 331         u16 ul_app1_len;
 332         u16 ul_app2_len;
 333         u16 ul_ctrl_len;
 334 } __attribute__ ((packed));
 335
 336 /* This stores all control downlink flags */
 337 struct ctrl_dl {
 338         unsigned int DSR:1;
 339         unsigned int DCD:1;
 340         unsigned int RI:1;
 341         unsigned int CTS:1;
 342         unsigned int reserverd:4;
 343         u8 port;
 344 } __attribute__ ((packed));
 345
 346 /* This stores all control uplink flags */
 347 struct ctrl_ul {
 348         unsigned int DTR:1;
 349         unsigned int RTS:1;
 350         unsigned int reserved:6;
 351         u8 port;
 352 } __attribute__ ((packed));
 353 #endif
 354
 355 /* This holds all information that is needed regarding a port */
 356 struct port {
 357         struct tty_port port;
 358         u8 update_flow_control;
 359         struct ctrl_ul ctrl_ul;
 360         struct ctrl_dl ctrl_dl;
 361         struct kfifo fifo_ul;
 362         void __iomem *dl_addr[2];
 363         u32 dl_size[2];
 364         u8 toggle_dl;
 365         void __iomem *ul_addr[2];
 366         u32 ul_size[2];
 367         u8 toggle_ul;
 368         u16 token_dl;
 369
 370         /* mutex to ensure one access patch to this port */
 371         struct mutex tty_sem;
 372         wait_queue_head_t tty_wait;
 373         struct async_icount tty_icount;
 374
 375         struct nozomi *dc;
 376 };
 377
 378 /* Private data one for each card in the system */
 379 struct nozomi {
 380         void __iomem *base_addr;
 381         unsigned long flip;
 382
 383         /* Pointers to registers */
 384         void __iomem *reg_iir;
 385         void __iomem *reg_fcr;
 386         void __iomem *reg_ier;
 387
 388         u16 last_ier;
 389         enum card_type card_type;
 390         struct config_table config_table;       /* Configuration table */
 391         struct pci_dev *pdev;
 392         struct port port[NOZOMI_MAX_PORTS];
 393         u8 *send_buf;
 394
 395         spinlock_t spin_mutex;  /* secures access to registers and tty */
 396
 397         unsigned int index_start;
 398         enum card_state state;
 399         u32 open_ttys;
 400 };
 401
 402 /* This is a data packet that is read or written to/from card */
 403 struct buffer {
 404         u32 size;               /* size is the length of the data buffer */
 405         u8 *data;
 406 } __attribute__ ((packed));
 407
 408 /*    Global variables */
 409 static const struct pci_device_id nozomi_pci_tbl[] __devinitconst = {
 410         {PCI_DEVICE(VENDOR1, DEVICE1)},
 411         {},
 412 };
 413
 414 MODULE_DEVICE_TABLE(pci, nozomi_pci_tbl);
 415
 416 static struct nozomi *ndevs[NOZOMI_MAX_CARDS];
 417 static struct tty_driver *ntty_driver;
 418
 419 static const struct tty_port_operations noz_tty_port_ops;
 420
 421 /*
 422  * find card by tty_index
 423  */
 424 static inline struct nozomi *get_dc_by_tty(const struct tty_struct *tty)
 425 {
 426         return tty ? ndevs[tty->index / MAX_PORT] : NULL;
 427 }
 428
 429 static inline struct port *get_port_by_tty(const struct tty_struct *tty)
 430 {
 431         struct nozomi *ndev = get_dc_by_tty(tty);
 432         return ndev ? &ndev->port[tty->index % MAX_PORT] : NULL;
 433 }
 434
 435 /*
 436  * TODO:
 437  * -Optimize
 438  * -Rewrite cleaner
 439  */
 440
 441 static void read_mem32(u32 *buf, const void __iomem *mem_addr_start,
 442                         u32 size_bytes)
 443 {
 444         u32 i = 0;
 445         const u32 __iomem *ptr = mem_addr_start;
 446         u16 *buf16;
 447
 448         if (unlikely(!ptr || !buf))
 449                 goto out;
 450
 451         /* shortcut for extremely often used cases */
 452         switch (size_bytes) {
 453         case 2: /* 2 bytes */
 454                 buf16 = (u16 *) buf;
 455                 *buf16 = __le16_to_cpu(readw(ptr));
 456                 goto out;
 457                 break;
 458         case 4: /* 4 bytes */
 459                 *(buf) = __le32_to_cpu(readl(ptr));
 460                 goto out;
 461                 break;
 462         }
 463
 464         while (i < size_bytes) {
 465                 if (size_bytes - i == 2) {
 466                         /* Handle 2 bytes in the end */
 467                         buf16 = (u16 *) buf;
 468                         *(buf16) = __le16_to_cpu(readw(ptr));
 469                         i += 2;
 470                 } else {
 471                         /* Read 4 bytes */
 472                         *(buf) = __le32_to_cpu(readl(ptr));
 473                         i += 4;
 474                 }
 475                 buf++;
 476                 ptr++;
 477         }
 478 out:
 479         return;
 480 }
 481
 482 /*
 483  * TODO:
 484  * -Optimize
 485  * -Rewrite cleaner
 486  */
 487 static u32 write_mem32(void __iomem *mem_addr_start, const u32 *buf,
 488                         u32 size_bytes)
 489 {
 490         u32 i = 0;
 491         u32 __iomem *ptr = mem_addr_start;
 492         const u16 *buf16;
 493
 494         if (unlikely(!ptr || !buf))
 495                 return 0;
 496
 497         /* shortcut for extremely often used cases */
 498         switch (size_bytes) {
 499         case 2: /* 2 bytes */
 500                 buf16 = (const u16 *)buf;
 501                 writew(__cpu_to_le16(*buf16), ptr);
 502                 return 2;
 503                 break;
 504         case 1: /*
 505                  * also needs to write 4 bytes in this case
 506                  * so falling through..
 507                  */
 508         case 4: /* 4 bytes */
 509                 writel(__cpu_to_le32(*buf), ptr);
 510                 return 4;
 511                 break;
 512         }
 513
 514         while (i < size_bytes) {
 515                 if (size_bytes - i == 2) {
 516                         /* 2 bytes */
 517                         buf16 = (const u16 *)buf;
 518                         writew(__cpu_to_le16(*buf16), ptr);
 519                         i += 2;
 520                 } else {
 521                         /* 4 bytes */
 522                         writel(__cpu_to_le32(*buf), ptr);
 523                         i += 4;
 524                 }
 525                 buf++;
 526                 ptr++;
 527         }
 528         return i;
 529 }
 530
 531 /* Setup pointers to different channels and also setup buffer sizes. */
 532 static void setup_memory(struct nozomi *dc)
 533 {
 534         void __iomem *offset = dc->base_addr + dc->config_table.dl_start;
 535         /* The length reported is including the length field of 4 bytes,
 536          * hence subtract with 4.
 537          */
 538         const u16 buff_offset = 4;
 539
 540         /* Modem port dl configuration */
 541         dc->port[PORT_MDM].dl_addr[CH_A] = offset;
 542         dc->port[PORT_MDM].dl_addr[CH_B] =
 543                                 (offset += dc->config_table.dl_mdm_len1);
 544         dc->port[PORT_MDM].dl_size[CH_A] =
 545                                 dc->config_table.dl_mdm_len1 - buff_offset;
 546         dc->port[PORT_MDM].dl_size[CH_B] =
 547                                 dc->config_table.dl_mdm_len2 - buff_offset;
 548
 549         /* Diag port dl configuration */
 550         dc->port[PORT_DIAG].dl_addr[CH_A] =
 551                                 (offset += dc->config_table.dl_mdm_len2);
 552         dc->port[PORT_DIAG].dl_size[CH_A] =
 553                                 dc->config_table.dl_diag_len1 - buff_offset;
 554         dc->port[PORT_DIAG].dl_addr[CH_B] =
 555                                 (offset += dc->config_table.dl_diag_len1);
 556         dc->port[PORT_DIAG].dl_size[CH_B] =
 557                                 dc->config_table.dl_diag_len2 - buff_offset;
 558
 559         /* App1 port dl configuration */
 560         dc->port[PORT_APP1].dl_addr[CH_A] =
 561                                 (offset += dc->config_table.dl_diag_len2);
 562         dc->port[PORT_APP1].dl_size[CH_A] =
 563                                 dc->config_table.dl_app1_len - buff_offset;
 564
 565         /* App2 port dl configuration */
 566         dc->port[PORT_APP2].dl_addr[CH_A] =
 567                                 (offset += dc->config_table.dl_app1_len);
 568         dc->port[PORT_APP2].dl_size[CH_A] =
 569                                 dc->config_table.dl_app2_len - buff_offset;
 570
 571         /* Ctrl dl configuration */
 572         dc->port[PORT_CTRL].dl_addr[CH_A] =
 573                                 (offset += dc->config_table.dl_app2_len);
 574         dc->port[PORT_CTRL].dl_size[CH_A] =
 575                                 dc->config_table.dl_ctrl_len - buff_offset;
 576
 577         offset = dc->base_addr + dc->config_table.ul_start;
 578
 579         /* Modem Port ul configuration */
 580         dc->port[PORT_MDM].ul_addr[CH_A] = offset;
 581         dc->port[PORT_MDM].ul_size[CH_A] =
 582                                 dc->config_table.ul_mdm_len1 - buff_offset;
 583         dc->port[PORT_MDM].ul_addr[CH_B] =
 584                                 (offset += dc->config_table.ul_mdm_len1);
 585         dc->port[PORT_MDM].ul_size[CH_B] =
 586                                 dc->config_table.ul_mdm_len2 - buff_offset;
 587
 588         /* Diag port ul configuration */
 589         dc->port[PORT_DIAG].ul_addr[CH_A] =
 590                                 (offset += dc->config_table.ul_mdm_len2);
 591         dc->port[PORT_DIAG].ul_size[CH_A] =
 592                                 dc->config_table.ul_diag_len - buff_offset;
 593
 594         /* App1 port ul configuration */
 595         dc->port[PORT_APP1].ul_addr[CH_A] =
 596                                 (offset += dc->config_table.ul_diag_len);
 597         dc->port[PORT_APP1].ul_size[CH_A] =
 598                                 dc->config_table.ul_app1_len - buff_offset;
 599
 600         /* App2 port ul configuration */
 601         dc->port[PORT_APP2].ul_addr[CH_A] =
 602                                 (offset += dc->config_table.ul_app1_len);
 603         dc->port[PORT_APP2].ul_size[CH_A] =
 604                                 dc->config_table.ul_app2_len - buff_offset;
 605
 606         /* Ctrl ul configuration */
 607         dc->port[PORT_CTRL].ul_addr[CH_A] =
 608                                 (offset += dc->config_table.ul_app2_len);
 609         dc->port[PORT_CTRL].ul_size[CH_A] =
 610                                 dc->config_table.ul_ctrl_len - buff_offset;
 611 }
 612
 613 /* Dump config table under initalization phase */
 614 #ifdef DEBUG
 615 static void dump_table(const struct nozomi *dc)
 616 {
 617         DBG3("signature: 0x%08X", dc->config_table.signature);
 618         DBG3("version: 0x%04X", dc->config_table.version);
 619         DBG3("product_information: 0x%04X", \
 620                                 dc->config_table.product_information);
 621         DBG3("toggle enabled: %d", dc->config_table.toggle.enabled);
 622         DBG3("toggle up_mdm: %d", dc->config_table.toggle.mdm_ul);
 623         DBG3("toggle dl_mdm: %d", dc->config_table.toggle.mdm_dl);
 624         DBG3("toggle dl_dbg: %d", dc->config_table.toggle.diag_dl);
 625
 626         DBG3("dl_start: 0x%04X", dc->config_table.dl_start);
 627         DBG3("dl_mdm_len0: 0x%04X, %d", dc->config_table.dl_mdm_len1,
 628            dc->config_table.dl_mdm_len1);
 629         DBG3("dl_mdm_len1: 0x%04X, %d", dc->config_table.dl_mdm_len2,
 630            dc->config_table.dl_mdm_len2);
 631         DBG3("dl_diag_len0: 0x%04X, %d", dc->config_table.dl_diag_len1,
 632            dc->config_table.dl_diag_len1);
 633         DBG3("dl_diag_len1: 0x%04X, %d", dc->config_table.dl_diag_len2,
 634            dc->config_table.dl_diag_len2);
 635         DBG3("dl_app1_len: 0x%04X, %d", dc->config_table.dl_app1_len,
 636            dc->config_table.dl_app1_len);
 637         DBG3("dl_app2_len: 0x%04X, %d", dc->config_table.dl_app2_len,
 638            dc->config_table.dl_app2_len);
 639         DBG3("dl_ctrl_len: 0x%04X, %d", dc->config_table.dl_ctrl_len,
 640            dc->config_table.dl_ctrl_len);
 641         DBG3("ul_start: 0x%04X, %d", dc->config_table.ul_start,
 642            dc->config_table.ul_start);
 643         DBG3("ul_mdm_len[0]: 0x%04X, %d", dc->config_table.ul_mdm_len1,
 644            dc->config_table.ul_mdm_len1);
 645         DBG3("ul_mdm_len[1]: 0x%04X, %d", dc->config_table.ul_mdm_len2,
 646            dc->config_table.ul_mdm_len2);
 647         DBG3("ul_diag_len: 0x%04X, %d", dc->config_table.ul_diag_len,
 648            dc->config_table.ul_diag_len);
 649         DBG3("ul_app1_len: 0x%04X, %d", dc->config_table.ul_app1_len,
 650            dc->config_table.ul_app1_len);
 651         DBG3("ul_app2_len: 0x%04X, %d", dc->config_table.ul_app2_len,
 652            dc->config_table.ul_app2_len);
 653         DBG3("ul_ctrl_len: 0x%04X, %d", dc->config_table.ul_ctrl_len,
 654            dc->config_table.ul_ctrl_len);
 655 }
 656 #else
 657 static inline void dump_table(const struct nozomi *dc) { }
 658 #endif
 659
 660 /*
 661  * Read configuration table from card under intalization phase
 662  * Returns 1 if ok, else 0
 663  */
 664 static int nozomi_read_config_table(struct nozomi *dc)
 665 {
 666         read_mem32((u32 *) &dc->config_table, dc->base_addr + 0,
 667                                                 sizeof(struct config_table));
 668
 669         if (dc->config_table.signature != CONFIG_MAGIC) {
 670                 dev_err(&dc->pdev->dev, "ConfigTable Bad! 0x%08X != 0x%08X\n",
 671                         dc->config_table.signature, CONFIG_MAGIC);
 672                 return 0;
 673         }
 674
 675         if ((dc->config_table.version == 0)
 676             || (dc->config_table.toggle.enabled == TOGGLE_VALID)) {
 677                 int i;
 678                 DBG1("Second phase, configuring card");
 679
 680                 setup_memory(dc);
 681
 682                 dc->port[PORT_MDM].toggle_ul = dc->config_table.toggle.mdm_ul;
 683                 dc->port[PORT_MDM].toggle_dl = dc->config_table.toggle.mdm_dl;
 684                 dc->port[PORT_DIAG].toggle_dl = dc->config_table.toggle.diag_dl;
 685                 DBG1("toggle ports: MDM UL:%d MDM DL:%d, DIAG DL:%d",
 686                    dc->port[PORT_MDM].toggle_ul,
 687                    dc->port[PORT_MDM].toggle_dl, dc->port[PORT_DIAG].toggle_dl);
 688
 689                 dump_table(dc);
 690
 691                 for (i = PORT_MDM; i < MAX_PORT; i++) {
 692                         memset(&dc->port[i].ctrl_dl, 0, sizeof(struct ctrl_dl));
 693                         memset(&dc->port[i].ctrl_ul, 0, sizeof(struct ctrl_ul));
 694                 }
 695
 696                 /* Enable control channel */
 697                 dc->last_ier = dc->last_ier | CTRL_DL;
 698                 writew(dc->last_ier, dc->reg_ier);
 699
 700                 dc->state = NOZOMI_STATE_ALLOCATED;
 701                 dev_info(&dc->pdev->dev, "Initialization OK!\n");
 702                 return 1;
 703         }
 704
 705         if ((dc->config_table.version > 0)
 706             && (dc->config_table.toggle.enabled != TOGGLE_VALID)) {
 707                 u32 offset = 0;
 708                 DBG1("First phase: pushing upload buffers, clearing download");
 709
 710                 dev_info(&dc->pdev->dev, "Version of card: %d\n",
 711                          dc->config_table.version);
 712
 713                 /* Here we should disable all I/O over F32. */
 714                 setup_memory(dc);
 715
 716                 /*
 717                  * We should send ALL channel pair tokens back along
 718                  * with reset token
 719                  */
 720
 721                 /* push upload modem buffers */
 722                 write_mem32(dc->port[PORT_MDM].ul_addr[CH_A],
 723                         (u32 *) &offset, 4);
 724                 write_mem32(dc->port[PORT_MDM].ul_addr[CH_B],
 725                         (u32 *) &offset, 4);
 726
 727                 writew(MDM_UL | DIAG_DL | MDM_DL, dc->reg_fcr);
 728
 729                 DBG1("First phase done");
 730         }
 731
 732         return 1;
 733 }
 734
 735 /* Enable uplink interrupts  */
 736 static void enable_transmit_ul(enum port_type port, struct nozomi *dc)
 737 {
 738         static const u16 mask[] = {MDM_UL, DIAG_UL, APP1_UL, APP2_UL, CTRL_UL};
 739
 740         if (port < NOZOMI_MAX_PORTS) {
 741                 dc->last_ier |= mask[port];
 742                 writew(dc->last_ier, dc->reg_ier);
 743         } else {
 744                 dev_err(&dc->pdev->dev, "Called with wrong port?\n");
 745         }
 746 }
 747
 748 /* Disable uplink interrupts  */
 749 static void disable_transmit_ul(enum port_type port, struct nozomi *dc)
 750 {
 751         static const u16 mask[] =
 752                 {~MDM_UL, ~DIAG_UL, ~APP1_UL, ~APP2_UL, ~CTRL_UL};
 753
 754         if (port < NOZOMI_MAX_PORTS) {
 755                 dc->last_ier &= mask[port];
 756                 writew(dc->last_ier, dc->reg_ier);
 757         } else {
 758                 dev_err(&dc->pdev->dev, "Called with wrong port?\n");
 759         }
 760 }
 761
 762 /* Enable downlink interrupts */
 763 static void enable_transmit_dl(enum port_type port, struct nozomi *dc)
 764 {
 765         static const u16 mask[] = {MDM_DL, DIAG_DL, APP1_DL, APP2_DL, CTRL_DL};
 766
 767         if (port < NOZOMI_MAX_PORTS) {
 768                 dc->last_ier |= mask[port];
 769                 writew(dc->last_ier, dc->reg_ier);
 770         } else {
 771                 dev_err(&dc->pdev->dev, "Called with wrong port?\n");
 772         }
 773 }
 774
 775 /* Disable downlink interrupts */
 776 static void disable_transmit_dl(enum port_type port, struct nozomi *dc)
 777 {
 778         static const u16 mask[] =
 779                 {~MDM_DL, ~DIAG_DL, ~APP1_DL, ~APP2_DL, ~CTRL_DL};
 780
 781         if (port < NOZOMI_MAX_PORTS) {
 782                 dc->last_ier &= mask[port];
 783                 writew(dc->last_ier, dc->reg_ier);
 784         } else {
 785                 dev_err(&dc->pdev->dev, "Called with wrong port?\n");
 786         }
 787 }
 788
 789 /*
 790  * Return 1 - send buffer to card and ack.
 791  * Return 0 - don't ack, don't send buffer to card.
 792  */
 793 static int send_data(enum port_type index, struct nozomi *dc)
 794 {
 795         u32 size = 0;
 796         struct port *port = &dc->port[index];
 797         const u8 toggle = port->toggle_ul;
 798         void __iomem *addr = port->ul_addr[toggle];
 799         const u32 ul_size = port->ul_size[toggle];
 800         struct tty_struct *tty = tty_port_tty_get(&port->port);
 801
 802         /* Get data from tty and place in buf for now */
 803         size = kfifo_out(&port->fifo_ul, dc->send_buf,
 804                            ul_size < SEND_BUF_MAX ? ul_size : SEND_BUF_MAX);
 805
 806         if (size == 0) {
 807                 DBG4("No more data to send, disable link:");
 808                 tty_kref_put(tty);
 809                 return 0;
 810         }
 811
 812         /* DUMP(buf, size); */
 813
 814         /* Write length + data */
 815         write_mem32(addr, (u32 *) &size, 4);
 816         write_mem32(addr + 4, (u32 *) dc->send_buf, size);
 817
 818         if (tty)
 819                 tty_wakeup(tty);
 820
 821         tty_kref_put(tty);
 822         return 1;
 823 }
 824
 825 /* If all data has been read, return 1, else 0 */
 826 static int receive_data(enum port_type index, struct nozomi *dc)
 827 {
 828         u8 buf[RECEIVE_BUF_MAX] = { 0 };
 829         int size;
 830         u32 offset = 4;
 831         struct port *port = &dc->port[index];
 832         void __iomem *addr = port->dl_addr[port->toggle_dl];
 833         struct tty_struct *tty = tty_port_tty_get(&port->port);
 834         int i, ret;
 835
 836         if (unlikely(!tty)) {
 837                 DBG1("tty not open for port: %d?", index);
 838                 return 1;
 839         }
 840
 841         read_mem32((u32 *) &size, addr, 4);
 842         /*  DBG1( "%d bytes port: %d", size, index); */
 843
 844         if (test_bit(TTY_THROTTLED, &tty->flags)) {
 845                 DBG1("No room in tty, don't read data, don't ack interrupt, "
 846                         "disable interrupt");
 847
 848                 /* disable interrupt in downlink... */
 849                 disable_transmit_dl(index, dc);
 850                 ret = 0;
 851                 goto put;
 852         }
 853
 854         if (unlikely(size == 0)) {
 855                 dev_err(&dc->pdev->dev, "size == 0?\n");
 856                 ret = 1;
 857                 goto put;
 858         }
 859
 860         tty_buffer_request_room(tty, size);
 861
 862         while (size > 0) {
 863                 read_mem32((u32 *) buf, addr + offset, RECEIVE_BUF_MAX);
 864
 865                 if (size == 1) {
 866                         tty_insert_flip_char(tty, buf[0], TTY_NORMAL);
 867                         size = 0;
 868                 } else if (size < RECEIVE_BUF_MAX) {
 869                         size -= tty_insert_flip_string(tty, (char *) buf, size);
 870                 } else {
 871                         i = tty_insert_flip_string(tty, \
 872                                                 (char *) buf, RECEIVE_BUF_MAX);
 873                         size -= i;
 874                         offset += i;
 875                 }
 876         }
 877
 878         set_bit(index, &dc->flip);
 879         ret = 1;
 880 put:
 881         tty_kref_put(tty);
 882         return ret;
 883 }
 884
 885 /* Debug for interrupts */
 886 #ifdef DEBUG
 887 static char *interrupt2str(u16 interrupt)
 888 {
 889         static char buf[TMP_BUF_MAX];
 890         char *p = buf;
 891
 892         interrupt & MDM_DL1 ? p += snprintf(p, TMP_BUF_MAX, "MDM_DL1 ") : NULL;
 893         interrupt & MDM_DL2 ? p += snprintf(p, TMP_BUF_MAX - (p - buf),
 894                                         "MDM_DL2 ") : NULL;
 895
 896         interrupt & MDM_UL1 ? p += snprintf(p, TMP_BUF_MAX - (p - buf),
 897                                         "MDM_UL1 ") : NULL;
 898         interrupt & MDM_UL2 ? p += snprintf(p, TMP_BUF_MAX - (p - buf),
 899                                         "MDM_UL2 ") : NULL;
 900
 901         interrupt & DIAG_DL1 ? p += snprintf(p, TMP_BUF_MAX - (p - buf),
 902                                         "DIAG_DL1 ") : NULL;
 903         interrupt & DIAG_DL2 ? p += snprintf(p, TMP_BUF_MAX - (p - buf),
 904                                         "DIAG_DL2 ") : NULL;
 905
 906         interrupt & DIAG_UL ? p += snprintf(p, TMP_BUF_MAX - (p - buf),
 907                                         "DIAG_UL ") : NULL;
 908
 909         interrupt & APP1_DL ? p += snprintf(p, TMP_BUF_MAX - (p - buf),
 910                                         "APP1_DL ") : NULL;
 911         interrupt & APP2_DL ? p += snprintf(p, TMP_BUF_MAX - (p - buf),
 912                                         "APP2_DL ") : NULL;
 913
 914         interrupt & APP1_UL ? p += snprintf(p, TMP_BUF_MAX - (p - buf),
 915                                         "APP1_UL ") : NULL;
 916         interrupt & APP2_UL ? p += snprintf(p, TMP_BUF_MAX - (p - buf),
 917                                         "APP2_UL ") : NULL;
 918
 919         interrupt & CTRL_DL ? p += snprintf(p, TMP_BUF_MAX - (p - buf),
 920                                         "CTRL_DL ") : NULL;
 921         interrupt & CTRL_UL ? p += snprintf(p, TMP_BUF_MAX - (p - buf),
 922                                         "CTRL_UL ") : NULL;
 923
 924         interrupt & RESET ? p += snprintf(p, TMP_BUF_MAX - (p - buf),
 925                                         "RESET ") : NULL;
 926
 927         return buf;
 928 }
 929 #endif
 930
 931 /*
 932  * Receive flow control
 933  * Return 1 - If ok, else 0
 934  */
 935 static int receive_flow_control(struct nozomi *dc)
 936 {
 937         enum port_type port = PORT_MDM;
 938         struct ctrl_dl ctrl_dl;
 939         struct ctrl_dl old_ctrl;
 940         u16 enable_ier = 0;
 941
 942         read_mem32((u32 *) &ctrl_dl, dc->port[PORT_CTRL].dl_addr[CH_A], 2);
 943
 944         switch (ctrl_dl.port) {
 945         case CTRL_CMD:
 946                 DBG1("The Base Band sends this value as a response to a "
 947                         "request for IMSI detach sent over the control "
 948                         "channel uplink (see section 7.6.1).");
 949                 break;
 950         case CTRL_MDM:
 951                 port = PORT_MDM;
 952                 enable_ier = MDM_DL;
 953                 break;
 954         case CTRL_DIAG:
 955                 port = PORT_DIAG;
 956                 enable_ier = DIAG_DL;
 957                 break;
 958         case CTRL_APP1:
 959                 port = PORT_APP1;
 960                 enable_ier = APP1_DL;
 961                 break;
 962         case CTRL_APP2:
 963                 port = PORT_APP2;
 964                 enable_ier = APP2_DL;
 965                 if (dc->state == NOZOMI_STATE_ALLOCATED) {
 966                         /*
 967                          * After card initialization the flow control
 968                          * received for APP2 is always the last
 969                          */
 970                         dc->state = NOZOMI_STATE_READY;
 971                         dev_info(&dc->pdev->dev, "Device READY!\n");
 972                 }
 973                 break;
 974         default:
 975                 dev_err(&dc->pdev->dev,
 976                         "ERROR: flow control received for non-existing port\n");
 977                 return 0;
 978         };
 979
 980         DBG1("0x%04X->0x%04X", *((u16 *)&dc->port[port].ctrl_dl),
 981            *((u16 *)&ctrl_dl));
 982
 983         old_ctrl = dc->port[port].ctrl_dl;
 984         dc->port[port].ctrl_dl = ctrl_dl;
 985
 986         if (old_ctrl.CTS == 1 && ctrl_dl.CTS == 0) {
 987                 DBG1("Disable interrupt (0x%04X) on port: %d",
 988                         enable_ier, port);
 989                 disable_transmit_ul(port, dc);
 990
 991         } else if (old_ctrl.CTS == 0 && ctrl_dl.CTS == 1) {
 992
 993                 if (kfifo_len(&dc->port[port].fifo_ul)) {
 994                         DBG1("Enable interrupt (0x%04X) on port: %d",
 995                                 enable_ier, port);
 996                         DBG1("Data in buffer [%d], enable transmit! ",
 997                                 kfifo_len(&dc->port[port].fifo_ul));
 998                         enable_transmit_ul(port, dc);
 999                 } else {
1000                         DBG1("No data in buffer...");
1001                 }
1002         }
1003
1004         if (*(u16 *)&old_ctrl == *(u16 *)&ctrl_dl) {
1005                 DBG1(" No change in mctrl");
1006                 return 1;
1007         }
1008         /* Update statistics */
1009         if (old_ctrl.CTS != ctrl_dl.CTS)
1010                 dc->port[port].tty_icount.cts++;
1011         if (old_ctrl.DSR != ctrl_dl.DSR)
1012                 dc->port[port].tty_icount.dsr++;
1013         if (old_ctrl.RI != ctrl_dl.RI)
1014                 dc->port[port].tty_icount.rng++;
1015         if (old_ctrl.DCD != ctrl_dl.DCD)
1016                 dc->port[port].tty_icount.dcd++;
1017
1018         wake_up_interruptible(&dc->port[port].tty_wait);
1019
1020         DBG1("port: %d DCD(%d), CTS(%d), RI(%d), DSR(%d)",
1021            port,
1022            dc->port[port].tty_icount.dcd, dc->port[port].tty_icount.cts,
1023            dc->port[port].tty_icount.rng, dc->port[port].tty_icount.dsr);
1024
1025         return 1;
1026 }
1027
1028 static enum ctrl_port_type port2ctrl(enum port_type port,
1029                                         const struct nozomi *dc)
1030 {
1031         switch (port) {
1032         case PORT_MDM:
1033                 return CTRL_MDM;
1034         case PORT_DIAG:
1035                 return CTRL_DIAG;
1036         case PORT_APP1:
1037                 return CTRL_APP1;
1038         case PORT_APP2:
1039                 return CTRL_APP2;
1040         default:
1041                 dev_err(&dc->pdev->dev,
1042                         "ERROR: send flow control " \
1043                         "received for non-existing port\n");
1044         };
1045         return CTRL_ERROR;
1046 }
1047
1048 /*
1049  * Send flow control, can only update one channel at a time
1050  * Return 0 - If we have updated all flow control
1051  * Return 1 - If we need to update more flow control, ack current enable more
1052  */
1053 static int send_flow_control(struct nozomi *dc)
1054 {
1055         u32 i, more_flow_control_to_be_updated = 0;
1056         u16 *ctrl;
1057
1058         for (i = PORT_MDM; i < MAX_PORT; i++) {
1059                 if (dc->port[i].update_flow_control) {
1060                         if (more_flow_control_to_be_updated) {
1061                                 /* We have more flow control to be updated */
1062                                 return 1;
1063                         }
1064                         dc->port[i].ctrl_ul.port = port2ctrl(i, dc);
1065                         ctrl = (u16 *)&dc->port[i].ctrl_ul;
1066                         write_mem32(dc->port[PORT_CTRL].ul_addr[0], \
1067                                 (u32 *) ctrl, 2);
1068                         dc->port[i].update_flow_control = 0;
1069                         more_flow_control_to_be_updated = 1;
1070                 }
1071         }
1072         return 0;
1073 }
1074
1075 /*
1076  * Handle downlink data, ports that are handled are modem and diagnostics
1077  * Return 1 - ok
1078  * Return 0 - toggle fields are out of sync
1079  */
1080 static int handle_data_dl(struct nozomi *dc, enum port_type port, u8 *toggle,
1081                         u16 read_iir, u16 mask1, u16 mask2)
1082 {
1083         if (*toggle == 0 && read_iir & mask1) {
1084                 if (receive_data(port, dc)) {
1085                         writew(mask1, dc->reg_fcr);
1086                         *toggle = !(*toggle);
1087                 }
1088
1089                 if (read_iir & mask2) {
1090                         if (receive_data(port, dc)) {
1091                                 writew(mask2, dc->reg_fcr);
1092                                 *toggle = !(*toggle);
1093                         }
1094                 }
1095         } else if (*toggle == 1 && read_iir & mask2) {
1096                 if (receive_data(port, dc)) {
1097                         writew(mask2, dc->reg_fcr);
1098                         *toggle = !(*toggle);
1099                 }
1100
1101                 if (read_iir & mask1) {
1102                         if (receive_data(port, dc)) {
1103                                 writew(mask1, dc->reg_fcr);
1104                                 *toggle = !(*toggle);
1105                         }
1106                 }
1107         } else {
1108                 dev_err(&dc->pdev->dev, "port out of sync!, toggle:%d\n",
1109                         *toggle);
1110                 return 0;
1111         }
1112         return 1;
1113 }
1114
1115 /*
1116  * Handle uplink data, this is currently for the modem port
1117  * Return 1 - ok
1118  * Return 0 - toggle field are out of sync
1119  */
1120 static int handle_data_ul(struct nozomi *dc, enum port_type port, u16 read_iir)
1121 {
1122         u8 *toggle = &(dc->port[port].toggle_ul);
1123
1124         if (*toggle == 0 && read_iir & MDM_UL1) {
1125                 dc->last_ier &= ~MDM_UL;
1126                 writew(dc->last_ier, dc->reg_ier);
1127                 if (send_data(port, dc)) {
1128                         writew(MDM_UL1, dc->reg_fcr);
1129                         dc->last_ier = dc->last_ier | MDM_UL;
1130                         writew(dc->last_ier, dc->reg_ier);
1131                         *toggle = !*toggle;
1132                 }
1133
1134                 if (read_iir & MDM_UL2) {
1135                         dc->last_ier &= ~MDM_UL;
1136                         writew(dc->last_ier, dc->reg_ier);
1137                         if (send_data(port, dc)) {
1138                                 writew(MDM_UL2, dc->reg_fcr);
1139                                 dc->last_ier = dc->last_ier | MDM_UL;
1140                                 writew(dc->last_ier, dc->reg_ier);
1141                                 *toggle = !*toggle;
1142                         }
1143                 }
1144
1145         } else if (*toggle == 1 && read_iir & MDM_UL2) {
1146                 dc->last_ier &= ~MDM_UL;
1147                 writew(dc->last_ier, dc->reg_ier);
1148                 if (send_data(port, dc)) {
1149                         writew(MDM_UL2, dc->reg_fcr);
1150                         dc->last_ier = dc->last_ier | MDM_UL;
1151                         writew(dc->last_ier, dc->reg_ier);
1152                         *toggle = !*toggle;
1153                 }
1154
1155                 if (read_iir & MDM_UL1) {
1156                         dc->last_ier &= ~MDM_UL;
1157                         writew(dc->last_ier, dc->reg_ier);
1158                         if (send_data(port, dc)) {
1159                                 writew(MDM_UL1, dc->reg_fcr);
1160                                 dc->last_ier = dc->last_ier | MDM_UL;
1161                                 writew(dc->last_ier, dc->reg_ier);
1162                                 *toggle = !*toggle;
1163                         }
1164                 }
1165         } else {
1166                 writew(read_iir & MDM_UL, dc->reg_fcr);
1167                 dev_err(&dc->pdev->dev, "port out of sync!\n");
1168                 return 0;
1169         }
1170         return 1;
1171 }
1172
1173 static irqreturn_t interrupt_handler(int irq, void *dev_id)
1174 {
1175         struct nozomi *dc = dev_id;
1176         unsigned int a;
1177         u16 read_iir;
1178
1179         if (!dc)
1180                 return IRQ_NONE;
1181
1182         spin_lock(&dc->spin_mutex);
1183         read_iir = readw(dc->reg_iir);
1184
1185         /* Card removed */
1186         if (read_iir == (u16)-1)
1187                 goto none;
1188         /*
1189          * Just handle interrupt enabled in IER
1190          * (by masking with dc->last_ier)
1191          */
1192         read_iir &= dc->last_ier;
1193
1194         if (read_iir == 0)
1195                 goto none;
1196
1197
1198         DBG4("%s irq:0x%04X, prev:0x%04X", interrupt2str(read_iir), read_iir,
1199                 dc->last_ier);
1200
1201         if (read_iir & RESET) {
1202                 if (unlikely(!nozomi_read_config_table(dc))) {
1203                         dc->last_ier = 0x0;
1204                         writew(dc->last_ier, dc->reg_ier);
1205                         dev_err(&dc->pdev->dev, "Could not read status from "
1206                                 "card, we should disable interface\n");
1207                 } else {
1208                         writew(RESET, dc->reg_fcr);
1209                 }
1210                 /* No more useful info if this was the reset interrupt. */
1211                 goto exit_handler;
1212         }
1213         if (read_iir & CTRL_UL) {
1214                 DBG1("CTRL_UL");
1215                 dc->last_ier &= ~CTRL_UL;
1216                 writew(dc->last_ier, dc->reg_ier);
1217                 if (send_flow_control(dc)) {
1218                         writew(CTRL_UL, dc->reg_fcr);
1219                         dc->last_ier = dc->last_ier | CTRL_UL;
1220                         writew(dc->last_ier, dc->reg_ier);
1221                 }
1222         }
1223         if (read_iir & CTRL_DL) {
1224                 receive_flow_control(dc);
1225                 writew(CTRL_DL, dc->reg_fcr);
1226         }
1227         if (read_iir & MDM_DL) {
1228                 if (!handle_data_dl(dc, PORT_MDM,
1229                                 &(dc->port[PORT_MDM].toggle_dl), read_iir,
1230                                 MDM_DL1, MDM_DL2)) {
1231                         dev_err(&dc->pdev->dev, "MDM_DL out of sync!\n");
1232                         goto exit_handler;
1233                 }
1234         }
1235         if (read_iir & MDM_UL) {
1236                 if (!handle_data_ul(dc, PORT_MDM, read_iir)) {
1237                         dev_err(&dc->pdev->dev, "MDM_UL out of sync!\n");
1238                         goto exit_handler;
1239                 }
1240         }
1241         if (read_iir & DIAG_DL) {
1242                 if (!handle_data_dl(dc, PORT_DIAG,
1243                                 &(dc->port[PORT_DIAG].toggle_dl), read_iir,
1244                                 DIAG_DL1, DIAG_DL2)) {
1245                         dev_err(&dc->pdev->dev, "DIAG_DL out of sync!\n");
1246                         goto exit_handler;
1247                 }
1248         }
1249         if (read_iir & DIAG_UL) {
1250                 dc->last_ier &= ~DIAG_UL;
1251                 writew(dc->last_ier, dc->reg_ier);
1252                 if (send_data(PORT_DIAG, dc)) {
1253                         writew(DIAG_UL, dc->reg_fcr);
1254                         dc->last_ier = dc->last_ier | DIAG_UL;
1255                         writew(dc->last_ier, dc->reg_ier);
1256                 }
1257         }
1258         if (read_iir & APP1_DL) {
1259                 if (receive_data(PORT_APP1, dc))
1260                         writew(APP1_DL, dc->reg_fcr);
1261         }
1262         if (read_iir & APP1_UL) {
1263                 dc->last_ier &= ~APP1_UL;
1264                 writew(dc->last_ier, dc->reg_ier);
1265                 if (send_data(PORT_APP1, dc)) {
1266                         writew(APP1_UL, dc->reg_fcr);
1267                         dc->last_ier = dc->last_ier | APP1_UL;
1268                         writew(dc->last_ier, dc->reg_ier);
1269                 }
1270         }
1271         if (read_iir & APP2_DL) {
1272                 if (receive_data(PORT_APP2, dc))
1273                         writew(APP2_DL, dc->reg_fcr);
1274         }
1275         if (read_iir & APP2_UL) {
1276                 dc->last_ier &= ~APP2_UL;
1277                 writew(dc->last_ier, dc->reg_ier);
1278                 if (send_data(PORT_APP2, dc)) {
1279                         writew(APP2_UL, dc->reg_fcr);
1280                         dc->last_ier = dc->last_ier | APP2_UL;
1281                         writew(dc->last_ier, dc->reg_ier);
1282                 }
1283         }
1284
1285 exit_handler:
1286         spin_unlock(&dc->spin_mutex);
1287         for (a = 0; a < NOZOMI_MAX_PORTS; a++) {
1288                 struct tty_struct *tty;
1289                 if (test_and_clear_bit(a, &dc->flip)) {
1290                         tty = tty_port_tty_get(&dc->port[a].port);
1291                         if (tty)
1292                                 tty_flip_buffer_push(tty);
1293                         tty_kref_put(tty);
1294                 }
1295         }
1296         return IRQ_HANDLED;
1297 none:
1298         spin_unlock(&dc->spin_mutex);
1299         return IRQ_NONE;
1300 }
1301
1302 static void nozomi_get_card_type(struct nozomi *dc)
1303 {
1304         int i;
1305         u32 size = 0;
1306
1307         for (i = 0; i < 6; i++)
1308                 size += pci_resource_len(dc->pdev, i);
1309
1310         /* Assume card type F32_8 if no match */
1311         dc->card_type = size == 2048 ? F32_2 : F32_8;
1312
1313         dev_info(&dc->pdev->dev, "Card type is: %d\n", dc->card_type);
1314 }
1315
1316 static void nozomi_setup_private_data(struct nozomi *dc)
1317 {
1318         void __iomem *offset = dc->base_addr + dc->card_type / 2;
1319         unsigned int i;
1320
1321         dc->reg_fcr = (void __iomem *)(offset + R_FCR);
1322         dc->reg_iir = (void __iomem *)(offset + R_IIR);
1323         dc->reg_ier = (void __iomem *)(offset + R_IER);
1324         dc->last_ier = 0;
1325         dc->flip = 0;
1326
1327         dc->port[PORT_MDM].token_dl = MDM_DL;
1328         dc->port[PORT_DIAG].token_dl = DIAG_DL;
1329         dc->port[PORT_APP1].token_dl = APP1_DL;
1330         dc->port[PORT_APP2].token_dl = APP2_DL;
1331
1332         for (i = 0; i < MAX_PORT; i++)
1333                 init_waitqueue_head(&dc->port[i].tty_wait);
1334 }
1335
1336 static ssize_t card_type_show(struct device *dev, struct device_attribute *attr,
1337                           char *buf)
1338 {
1339         const struct nozomi *dc = pci_get_drvdata(to_pci_dev(dev));
1340
1341         return sprintf(buf, "%d\n", dc->card_type);
1342 }
1343 static DEVICE_ATTR(card_type, S_IRUGO, card_type_show, NULL);
1344
1345 static ssize_t open_ttys_show(struct device *dev, struct device_attribute *attr,
1346                           char *buf)
1347 {
1348         const struct nozomi *dc = pci_get_drvdata(to_pci_dev(dev));
1349
1350         return sprintf(buf, "%u\n", dc->open_ttys);
1351 }
1352 static DEVICE_ATTR(open_ttys, S_IRUGO, open_ttys_show, NULL);
1353
1354 static void make_sysfs_files(struct nozomi *dc)
1355 {
1356         if (device_create_file(&dc->pdev->dev, &dev_attr_card_type))
1357                 dev_err(&dc->pdev->dev,
1358                         "Could not create sysfs file for card_type\n");
1359         if (device_create_file(&dc->pdev->dev, &dev_attr_open_ttys))
1360                 dev_err(&dc->pdev->dev,
1361                         "Could not create sysfs file for open_ttys\n");
1362 }
1363
1364 static void remove_sysfs_files(struct nozomi *dc)
1365 {
1366         device_remove_file(&dc->pdev->dev, &dev_attr_card_type);
1367         device_remove_file(&dc->pdev->dev, &dev_attr_open_ttys);
1368 }
1369
1370 /* Allocate memory for one device */
1371 static int __devinit nozomi_card_init(struct pci_dev *pdev,
1372                                       const struct pci_device_id *ent)
1373 {
1374         resource_size_t start;
1375         int ret;
1376         struct nozomi *dc = NULL;
1377         int ndev_idx;
1378         int i;
1379
1380         dev_dbg(&pdev->dev, "Init, new card found\n");
1381
1382         for (ndev_idx = 0; ndev_idx < ARRAY_SIZE(ndevs); ndev_idx++)
1383                 if (!ndevs[ndev_idx])
1384                         break;
1385
1386         if (ndev_idx >= ARRAY_SIZE(ndevs)) {
1387                 dev_err(&pdev->dev, "no free tty range for this card left\n");
1388                 ret = -EIO;
1389                 goto err;
1390         }
1391
1392         dc = kzalloc(sizeof(struct nozomi), GFP_KERNEL);
1393         if (unlikely(!dc)) {
1394                 dev_err(&pdev->dev, "Could not allocate memory\n");
1395                 ret = -ENOMEM;
1396                 goto err_free;
1397         }
1398
1399         dc->pdev = pdev;
1400
1401         ret = pci_enable_device(dc->pdev);
1402         if (ret) {
1403                 dev_err(&pdev->dev, "Failed to enable PCI Device\n");
1404                 goto err_free;
1405         }
1406
1407         ret = pci_request_regions(dc->pdev, NOZOMI_NAME);
1408         if (ret) {
1409                 dev_err(&pdev->dev, "I/O address 0x%04x already in use\n",
1410                         (int) /* nozomi_private.io_addr */ 0);
1411                 goto err_disable_device;
1412         }
1413
1414         start = pci_resource_start(dc->pdev, 0);
1415         if (start == 0) {
1416                 dev_err(&pdev->dev, "No I/O address for card detected\n");
1417                 ret = -ENODEV;
1418                 goto err_rel_regs;
1419         }
1420
1421         /* Find out what card type it is */
1422         nozomi_get_card_type(dc);
1423
1424         dc->base_addr = ioremap_nocache(start, dc->card_type);
1425         if (!dc->base_addr) {
1426                 dev_err(&pdev->dev, "Unable to map card MMIO\n");
1427                 ret = -ENODEV;
1428                 goto err_rel_regs;
1429         }
1430
1431         dc->send_buf = kmalloc(SEND_BUF_MAX, GFP_KERNEL);
1432         if (!dc->send_buf) {
1433                 dev_err(&pdev->dev, "Could not allocate send buffer?\n");
1434                 ret = -ENOMEM;
1435                 goto err_free_sbuf;
1436         }
1437
1438         for (i = PORT_MDM; i < MAX_PORT; i++) {
1439                 if (kfifo_alloc(&dc->port[i].fifo_ul,
1440                       FIFO_BUFFER_SIZE_UL, GFP_ATOMIC)) {
1441                         dev_err(&pdev->dev,
1442                                         "Could not allocate kfifo buffer\n");
1443                         ret = -ENOMEM;
1444                         goto err_free_kfifo;
1445                 }
1446         }
1447
1448         spin_lock_init(&dc->spin_mutex);
1449
1450         nozomi_setup_private_data(dc);
1451
1452         /* Disable all interrupts */
1453         dc->last_ier = 0;
1454         writew(dc->last_ier, dc->reg_ier);
1455
1456         ret = request_irq(pdev->irq, &interrupt_handler, IRQF_SHARED,
1457                         NOZOMI_NAME, dc);
1458         if (unlikely(ret)) {
1459                 dev_err(&pdev->dev, "can't request irq %d\n", pdev->irq);
1460                 goto err_free_kfifo;
1461         }
1462
1463         DBG1("base_addr: %p", dc->base_addr);
1464
1465         make_sysfs_files(dc);
1466
1467         dc->index_start = ndev_idx * MAX_PORT;
1468         ndevs[ndev_idx] = dc;
1469
1470         pci_set_drvdata(pdev, dc);
1471
1472         /* Enable RESET interrupt */
1473         dc->last_ier = RESET;
1474         iowrite16(dc->last_ier, dc->reg_ier);
1475
1476         dc->state = NOZOMI_STATE_ENABLED;
1477
1478         for (i = 0; i < MAX_PORT; i++) {
1479                 struct device *tty_dev;
1480                 struct port *port = &dc->port[i];
1481                 port->dc = dc;
1482                 mutex_init(&port->tty_sem);
1483                 tty_port_init(&port->port);
1484                 port->port.ops = &noz_tty_port_ops;
1485                 tty_dev = tty_register_device(ntty_driver, dc->index_start + i,
1486                                                         &pdev->dev);
1487
1488                 if (IS_ERR(tty_dev)) {
1489                         ret = PTR_ERR(tty_dev);
1490                         dev_err(&pdev->dev, "Could not allocate tty?\n");
1491                         goto err_free_tty;
1492                 }
1493         }
1494
1495         return 0;
1496
1497 err_free_tty:
1498         for (i = dc->index_start; i < dc->index_start + MAX_PORT; ++i)
1499                 tty_unregister_device(ntty_driver, i);
1500 err_free_kfifo:
1501         for (i = 0; i < MAX_PORT; i++)
1502                 kfifo_free(&dc->port[i].fifo_ul);
1503 err_free_sbuf:
1504         kfree(dc->send_buf);
1505         iounmap(dc->base_addr);
1506 err_rel_regs:
1507         pci_release_regions(pdev);
1508 err_disable_device:
1509         pci_disable_device(pdev);
1510 err_free:
1511         kfree(dc);
1512 err:
1513         return ret;
1514 }
1515
1516 static void __devexit tty_exit(struct nozomi *dc)
1517 {
1518         unsigned int i;
1519
1520         DBG1(" ");
1521
1522         flush_scheduled_work();
1523
1524         for (i = 0; i < MAX_PORT; ++i) {
1525                 struct tty_struct *tty = tty_port_tty_get(&dc->port[i].port);
1526                 if (tty && list_empty(&tty->hangup_work.entry))
1527                         tty_hangup(tty);
1528                 tty_kref_put(tty);
1529         }
1530         /* Racy below - surely should wait for scheduled work to be done or
1531            complete off a hangup method ? */
1532         while (dc->open_ttys)
1533                 msleep(1);
1534         for (i = dc->index_start; i < dc->index_start + MAX_PORT; ++i)
1535                 tty_unregister_device(ntty_driver, i);
1536 }
1537
1538 /* Deallocate memory for one device */
1539 static void __devexit nozomi_card_exit(struct pci_dev *pdev)
1540 {
1541         int i;
1542         struct ctrl_ul ctrl;
1543         struct nozomi *dc = pci_get_drvdata(pdev);
1544
1545         /* Disable all interrupts */
1546         dc->last_ier = 0;
1547         writew(dc->last_ier, dc->reg_ier);
1548
1549         tty_exit(dc);
1550
1551         /* Send 0x0001, command card to resend the reset token.  */
1552         /* This is to get the reset when the module is reloaded. */
1553         ctrl.port = 0x00;
1554         ctrl.reserved = 0;
1555         ctrl.RTS = 0;
1556         ctrl.DTR = 1;
1557         DBG1("sending flow control 0x%04X", *((u16 *)&ctrl));
1558
1559         /* Setup dc->reg addresses to we can use defines here */
1560         write_mem32(dc->port[PORT_CTRL].ul_addr[0], (u32 *)&ctrl, 2);
1561         writew(CTRL_UL, dc->reg_fcr);   /* push the token to the card. */
1562
1563         remove_sysfs_files(dc);
1564
1565         free_irq(pdev->irq, dc);
1566
1567         for (i = 0; i < MAX_PORT; i++)
1568                 kfifo_free(&dc->port[i].fifo_ul);
1569
1570         kfree(dc->send_buf);
1571
1572         iounmap(dc->base_addr);
1573
1574         pci_release_regions(pdev);
1575
1576         pci_disable_device(pdev);
1577
1578         ndevs[dc->index_start / MAX_PORT] = NULL;
1579
1580         kfree(dc);
1581 }
1582
1583 static void set_rts(const struct tty_struct *tty, int rts)
1584 {
1585         struct port *port = get_port_by_tty(tty);
1586
1587         port->ctrl_ul.RTS = rts;
1588         port->update_flow_control = 1;
1589         enable_transmit_ul(PORT_CTRL, get_dc_by_tty(tty));
1590 }
1591
1592 static void set_dtr(const struct tty_struct *tty, int dtr)
1593 {
1594         struct port *port = get_port_by_tty(tty);
1595
1596         DBG1("SETTING DTR index: %d, dtr: %d", tty->index, dtr);
1597
1598         port->ctrl_ul.DTR = dtr;
1599         port->update_flow_control = 1;
1600         enable_transmit_ul(PORT_CTRL, get_dc_by_tty(tty));
1601 }
1602
1603 /*
1604  * ----------------------------------------------------------------------------
1605  * TTY code
1606  * ----------------------------------------------------------------------------
1607  */
1608
1609 static int ntty_install(struct tty_driver *driver, struct tty_struct *tty)
1610 {
1611         struct port *port = get_port_by_tty(tty);
1612         struct nozomi *dc = get_dc_by_tty(tty);
1613         int ret;
1614         if (!port || !dc || dc->state != NOZOMI_STATE_READY)
1615                 return -ENODEV;
1616         ret = tty_init_termios(tty);
1617         if (ret == 0) {
1618                 tty_driver_kref_get(driver);
1619                 driver->ttys[tty->index] = tty;
1620         }
1621         return ret;
1622 }
1623
1624 static void ntty_cleanup(struct tty_struct *tty)
1625 {
1626         tty->driver_data = NULL;
1627 }
1628
1629 static int ntty_activate(struct tty_port *tport, struct tty_struct *tty)
1630 {
1631         struct port *port = container_of(tport, struct port, port);
1632         struct nozomi *dc = port->dc;
1633         unsigned long flags;
1634
1635         DBG1("open: %d", port->token_dl);
1636         spin_lock_irqsave(&dc->spin_mutex, flags);
1637         dc->last_ier = dc->last_ier | port->token_dl;
1638         writew(dc->last_ier, dc->reg_ier);
1639         dc->open_ttys++;
1640         spin_unlock_irqrestore(&dc->spin_mutex, flags);
1641         printk("noz: activated %d: %p\n", tty->index, tport);
1642         return 0;
1643 }
1644
1645 static int ntty_open(struct tty_struct *tty, struct file *filp)
1646 {
1647         struct port *port = get_port_by_tty(tty);
1648         return tty_port_open(&port->port, tty, filp);
1649 }
1650
1651 static void ntty_shutdown(struct tty_port *tport)
1652 {
1653         struct port *port = container_of(tport, struct port, port);
1654         struct nozomi *dc = port->dc;
1655         unsigned long flags;
1656
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         dc->open_ttys--;
1662         spin_unlock_irqrestore(&dc->spin_mutex, flags);
1663         printk("noz: shutdown %p\n", tport);
1664 }
1665
1666 static void ntty_close(struct tty_struct *tty, struct file *filp)
1667 {
1668         struct port *port = tty->driver_data;
1669         if (port)
1670                 tty_port_close(&port->port, tty, filp);
1671 }
1672
1673 static void ntty_hangup(struct tty_struct *tty)
1674 {
1675         struct port *port = tty->driver_data;
1676         tty_port_hangup(&port->port);
1677 }
1678
1679 /*
1680  * called when the userspace process writes to the tty (/dev/noz*).
1681  * Data is inserted into a fifo, which is then read and transfered to the modem.
1682  */
1683 static int ntty_write(struct tty_struct *tty, const unsigned char *buffer,
1684                       int count)
1685 {
1686         int rval = -EINVAL;
1687         struct nozomi *dc = get_dc_by_tty(tty);
1688         struct port *port = tty->driver_data;
1689         unsigned long flags;
1690
1691         /* DBG1( "WRITEx: %d, index = %d", count, index); */
1692
1693         if (!dc || !port)
1694                 return -ENODEV;
1695
1696         mutex_lock(&port->tty_sem);
1697
1698         if (unlikely(!port->port.count)) {
1699                 DBG1(" ");
1700                 goto exit;
1701         }
1702
1703         rval = kfifo_in(&port->fifo_ul, (unsigned char *)buffer, count);
1704
1705         /* notify card */
1706         if (unlikely(dc == NULL)) {
1707                 DBG1("No device context?");
1708                 goto exit;
1709         }
1710
1711         spin_lock_irqsave(&dc->spin_mutex, flags);
1712         /* CTS is only valid on the modem channel */
1713         if (port == &(dc->port[PORT_MDM])) {
1714                 if (port->ctrl_dl.CTS) {
1715                         DBG4("Enable interrupt");
1716                         enable_transmit_ul(tty->index % MAX_PORT, dc);
1717                 } else {
1718                         dev_err(&dc->pdev->dev,
1719                                 "CTS not active on modem port?\n");
1720                 }
1721         } else {
1722                 enable_transmit_ul(tty->index % MAX_PORT, dc);
1723         }
1724         spin_unlock_irqrestore(&dc->spin_mutex, flags);
1725
1726 exit:
1727         mutex_unlock(&port->tty_sem);
1728         return rval;
1729 }
1730
1731 /*
1732  * Calculate how much is left in device
1733  * This method is called by the upper tty layer.
1734  *   #according to sources N_TTY.c it expects a value >= 0 and
1735  *    does not check for negative values.
1736  *
1737  * If the port is unplugged report lots of room and let the bits
1738  * dribble away so we don't block anything.
1739  */
1740 static int ntty_write_room(struct tty_struct *tty)
1741 {
1742         struct port *port = tty->driver_data;
1743         int room = 4096;
1744         const struct nozomi *dc = get_dc_by_tty(tty);
1745
1746         if (dc) {
1747                 mutex_lock(&port->tty_sem);
1748                 if (port->port.count)
1749                         room = port->fifo_ul.size -
1750                                         kfifo_len(&port->fifo_ul);
1751                 mutex_unlock(&port->tty_sem);
1752         }
1753         return room;
1754 }
1755
1756 /* Gets io control parameters */
1757 static int ntty_tiocmget(struct tty_struct *tty, struct file *file)
1758 {
1759         const struct port *port = tty->driver_data;
1760         const struct ctrl_dl *ctrl_dl = &port->ctrl_dl;
1761         const struct ctrl_ul *ctrl_ul = &port->ctrl_ul;
1762
1763         /* Note: these could change under us but it is not clear this
1764            matters if so */
1765         return  (ctrl_ul->RTS ? TIOCM_RTS : 0) |
1766                 (ctrl_ul->DTR ? TIOCM_DTR : 0) |
1767                 (ctrl_dl->DCD ? TIOCM_CAR : 0) |
1768                 (ctrl_dl->RI  ? TIOCM_RNG : 0) |
1769                 (ctrl_dl->DSR ? TIOCM_DSR : 0) |
1770                 (ctrl_dl->CTS ? TIOCM_CTS : 0);
1771 }
1772
1773 /* Sets io controls parameters */
1774 static int ntty_tiocmset(struct tty_struct *tty, struct file *file,
1775         unsigned int set, unsigned int clear)
1776 {
1777         struct nozomi *dc = get_dc_by_tty(tty);
1778         unsigned long flags;
1779
1780         spin_lock_irqsave(&dc->spin_mutex, flags);
1781         if (set & TIOCM_RTS)
1782                 set_rts(tty, 1);
1783         else if (clear & TIOCM_RTS)
1784                 set_rts(tty, 0);
1785
1786         if (set & TIOCM_DTR)
1787                 set_dtr(tty, 1);
1788         else if (clear & TIOCM_DTR)
1789                 set_dtr(tty, 0);
1790         spin_unlock_irqrestore(&dc->spin_mutex, flags);
1791
1792         return 0;
1793 }
1794
1795 static int ntty_cflags_changed(struct port *port, unsigned long flags,
1796                 struct async_icount *cprev)
1797 {
1798         const struct async_icount cnow = port->tty_icount;
1799         int ret;
1800
1801         ret =   ((flags & TIOCM_RNG) && (cnow.rng != cprev->rng)) ||
1802                 ((flags & TIOCM_DSR) && (cnow.dsr != cprev->dsr)) ||
1803                 ((flags & TIOCM_CD)  && (cnow.dcd != cprev->dcd)) ||
1804                 ((flags & TIOCM_CTS) && (cnow.cts != cprev->cts));
1805
1806         *cprev = cnow;
1807
1808         return ret;
1809 }
1810
1811 static int ntty_ioctl_tiocgicount(struct port *port, void __user *argp)
1812 {
1813         const struct async_icount cnow = port->tty_icount;
1814         struct serial_icounter_struct icount;
1815
1816         icount.cts = cnow.cts;
1817         icount.dsr = cnow.dsr;
1818         icount.rng = cnow.rng;
1819         icount.dcd = cnow.dcd;
1820         icount.rx = cnow.rx;
1821         icount.tx = cnow.tx;
1822         icount.frame = cnow.frame;
1823         icount.overrun = cnow.overrun;
1824         icount.parity = cnow.parity;
1825         icount.brk = cnow.brk;
1826         icount.buf_overrun = cnow.buf_overrun;
1827
1828         return copy_to_user(argp, &icount, sizeof(icount)) ? -EFAULT : 0;
1829 }
1830
1831 static int ntty_ioctl(struct tty_struct *tty, struct file *file,
1832                       unsigned int cmd, unsigned long arg)
1833 {
1834         struct port *port = tty->driver_data;
1835         void __user *argp = (void __user *)arg;
1836         int rval = -ENOIOCTLCMD;
1837
1838         DBG1("******** IOCTL, cmd: %d", cmd);
1839
1840         switch (cmd) {
1841         case TIOCMIWAIT: {
1842                 struct async_icount cprev = port->tty_icount;
1843
1844                 rval = wait_event_interruptible(port->tty_wait,
1845                                 ntty_cflags_changed(port, arg, &cprev));
1846                 break;
1847         } case TIOCGICOUNT:
1848                 rval = ntty_ioctl_tiocgicount(port, argp);
1849                 break;
1850         default:
1851                 DBG1("ERR: 0x%08X, %d", cmd, cmd);
1852                 break;
1853         };
1854
1855         return rval;
1856 }
1857
1858 /*
1859  * Called by the upper tty layer when tty buffers are ready
1860  * to receive data again after a call to throttle.
1861  */
1862 static void ntty_unthrottle(struct tty_struct *tty)
1863 {
1864         struct nozomi *dc = get_dc_by_tty(tty);
1865         unsigned long flags;
1866
1867         DBG1("UNTHROTTLE");
1868         spin_lock_irqsave(&dc->spin_mutex, flags);
1869         enable_transmit_dl(tty->index % MAX_PORT, dc);
1870         set_rts(tty, 1);
1871
1872         spin_unlock_irqrestore(&dc->spin_mutex, flags);
1873 }
1874
1875 /*
1876  * Called by the upper tty layer when the tty buffers are almost full.
1877  * The driver should stop send more data.
1878  */
1879 static void ntty_throttle(struct tty_struct *tty)
1880 {
1881         struct nozomi *dc = get_dc_by_tty(tty);
1882         unsigned long flags;
1883
1884         DBG1("THROTTLE");
1885         spin_lock_irqsave(&dc->spin_mutex, flags);
1886         set_rts(tty, 0);
1887         spin_unlock_irqrestore(&dc->spin_mutex, flags);
1888 }
1889
1890 /* Returns number of chars in buffer, called by tty layer */
1891 static s32 ntty_chars_in_buffer(struct tty_struct *tty)
1892 {
1893         struct port *port = tty->driver_data;
1894         struct nozomi *dc = get_dc_by_tty(tty);
1895         s32 rval = 0;
1896
1897         if (unlikely(!dc || !port)) {
1898                 goto exit_in_buffer;
1899         }
1900
1901         if (unlikely(!port->port.count)) {
1902                 dev_err(&dc->pdev->dev, "No tty open?\n");
1903                 goto exit_in_buffer;
1904         }
1905
1906         rval = kfifo_len(&port->fifo_ul);
1907
1908 exit_in_buffer:
1909         return rval;
1910 }
1911
1912 static const struct tty_port_operations noz_tty_port_ops = {
1913         .activate = ntty_activate,
1914         .shutdown = ntty_shutdown,
1915 };
1916
1917 static const struct tty_operations tty_ops = {
1918         .ioctl = ntty_ioctl,
1919         .open = ntty_open,
1920         .close = ntty_close,
1921         .hangup = ntty_hangup,
1922         .write = ntty_write,
1923         .write_room = ntty_write_room,
1924         .unthrottle = ntty_unthrottle,
1925         .throttle = ntty_throttle,
1926         .chars_in_buffer = ntty_chars_in_buffer,
1927         .tiocmget = ntty_tiocmget,
1928         .tiocmset = ntty_tiocmset,
1929         .install = ntty_install,
1930         .cleanup = ntty_cleanup,
1931 };
1932
1933 /* Module initialization */
1934 static struct pci_driver nozomi_driver = {
1935         .name = NOZOMI_NAME,
1936         .id_table = nozomi_pci_tbl,
1937         .probe = nozomi_card_init,
1938         .remove = __devexit_p(nozomi_card_exit),
1939 };
1940
1941 static __init int nozomi_init(void)
1942 {
1943         int ret;
1944
1945         printk(KERN_INFO "Initializing %s\n", VERSION_STRING);
1946
1947         ntty_driver = alloc_tty_driver(NTTY_TTY_MAXMINORS);
1948         if (!ntty_driver)
1949                 return -ENOMEM;
1950
1951         ntty_driver->owner = THIS_MODULE;
1952         ntty_driver->driver_name = NOZOMI_NAME_TTY;
1953         ntty_driver->name = "noz";
1954         ntty_driver->major = 0;
1955         ntty_driver->type = TTY_DRIVER_TYPE_SERIAL;
1956         ntty_driver->subtype = SERIAL_TYPE_NORMAL;
1957         ntty_driver->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_DYNAMIC_DEV;
1958         ntty_driver->init_termios = tty_std_termios;
1959         ntty_driver->init_termios.c_cflag = B115200 | CS8 | CREAD | \
1960                                                 HUPCL | CLOCAL;
1961         ntty_driver->init_termios.c_ispeed = 115200;
1962         ntty_driver->init_termios.c_ospeed = 115200;
1963         tty_set_operations(ntty_driver, &tty_ops);
1964
1965         ret = tty_register_driver(ntty_driver);
1966         if (ret) {
1967                 printk(KERN_ERR "Nozomi: failed to register ntty driver\n");
1968                 goto free_tty;
1969         }
1970
1971         ret = pci_register_driver(&nozomi_driver);
1972         if (ret) {
1973                 printk(KERN_ERR "Nozomi: can't register pci driver\n");
1974                 goto unr_tty;
1975         }
1976
1977         return 0;
1978 unr_tty:
1979         tty_unregister_driver(ntty_driver);
1980 free_tty:
1981         put_tty_driver(ntty_driver);
1982         return ret;
1983 }
1984
1985 static __exit void nozomi_exit(void)
1986 {
1987         printk(KERN_INFO "Unloading %s\n", DRIVER_DESC);
1988         pci_unregister_driver(&nozomi_driver);
1989         tty_unregister_driver(ntty_driver);
1990         put_tty_driver(ntty_driver);
1991 }
1992
1993 module_init(nozomi_init);
1994 module_exit(nozomi_exit);
1995
1996 module_param(debug, int, S_IRUGO | S_IWUSR);
1997
1998 MODULE_LICENSE("Dual BSD/GPL");
1999 MODULE_DESCRIPTION(DRIVER_DESC);