1 // SPDX-License-Identifier: (GPL-2.0+ OR BSD-3-Clause) 2 /* 3 * nozomi.c -- HSDPA driver Broadband Wireless Data Card - Globe Trotter 4 * 5 * Written by: Ulf Jakobsson, 6 * Jan Åkerfeldt, 7 * Stefan Thomasson, 8 * 9 * Maintained by: Paul Hardwick (p.hardwick@option.com) 10 * 11 * Patches: 12 * Locking code changes for Vodafone by Sphere Systems Ltd, 13 * Andrew Bird (ajb@spheresystems.co.uk ) 14 * & Phil Sanderson 15 * 16 * Source has been ported from an implementation made by Filip Aben @ Option 17 * 18 * -------------------------------------------------------------------------- 19 * 20 * Copyright (c) 2005,2006 Option Wireless Sweden AB 21 * Copyright (c) 2006 Sphere Systems Ltd 22 * Copyright (c) 2006 Option Wireless n/v 23 * All rights Reserved. 24 * 25 * -------------------------------------------------------------------------- 26 */ 27 28 /* Enable this to have a lot of debug printouts */ 29 #define DEBUG 30 31 #include <linux/kernel.h> 32 #include <linux/module.h> 33 #include <linux/pci.h> 34 #include <linux/ioport.h> 35 #include <linux/tty.h> 36 #include <linux/tty_driver.h> 37 #include <linux/tty_flip.h> 38 #include <linux/sched.h> 39 #include <linux/serial.h> 40 #include <linux/interrupt.h> 41 #include <linux/kmod.h> 42 #include <linux/init.h> 43 #include <linux/kfifo.h> 44 #include <linux/uaccess.h> 45 #include <linux/slab.h> 46 #include <asm/byteorder.h> 47 48 #include <linux/delay.h> 49 50 /* Default debug printout level */ 51 #define NOZOMI_DEBUG_LEVEL 0x00 52 static int debug = NOZOMI_DEBUG_LEVEL; 53 module_param(debug, int, S_IRUGO | S_IWUSR); 54 55 /* Macros definitions */ 56 #define DBG_(lvl, fmt, args...) \ 57 do { \ 58 if (lvl & debug) \ 59 pr_debug("[%d] %s(): " fmt "\n", \ 60 __LINE__, __func__, ##args); \ 61 } while (0) 62 63 #define DBG1(args...) DBG_(0x01, ##args) 64 #define DBG2(args...) DBG_(0x02, ##args) 65 #define DBG3(args...) DBG_(0x04, ##args) 66 #define DBG4(args...) DBG_(0x08, ##args) 67 68 /* TODO: rewrite to optimize macros... */ 69 70 #define TMP_BUF_MAX 256 71 72 #define DUMP(buf__, len__) \ 73 do { \ 74 char tbuf[TMP_BUF_MAX] = {0}; \ 75 if (len__ > 1) { \ 76 u32 data_len = min_t(u32, len__, TMP_BUF_MAX); \ 77 strscpy(tbuf, buf__, data_len); \ 78 if (tbuf[data_len - 2] == '\r') \ 79 tbuf[data_len - 2] = 'r'; \ 80 DBG1("SENDING: '%s' (%d+n)", tbuf, len__); \ 81 } else { \ 82 DBG1("SENDING: '%s' (%d)", tbuf, len__); \ 83 } \ 84 } while (0) 85 86 /* Defines */ 87 #define NOZOMI_NAME "nozomi" 88 #define NOZOMI_NAME_TTY "nozomi_tty" 89 90 #define NTTY_TTY_MAXMINORS 256 91 #define NTTY_FIFO_BUFFER_SIZE 8192 92 93 /* Must be power of 2 */ 94 #define FIFO_BUFFER_SIZE_UL 8192 95 96 /* Size of tmp send buffer to card */ 97 #define SEND_BUF_MAX 1024 98 #define RECEIVE_BUF_MAX 4 99 100 101 #define R_IIR 0x0000 /* Interrupt Identity Register */ 102 #define R_FCR 0x0000 /* Flow Control Register */ 103 #define R_IER 0x0004 /* Interrupt Enable Register */ 104 105 #define NOZOMI_CONFIG_MAGIC 0xEFEFFEFE 106 #define TOGGLE_VALID 0x0000 107 108 /* Definition of interrupt tokens */ 109 #define MDM_DL1 0x0001 110 #define MDM_UL1 0x0002 111 #define MDM_DL2 0x0004 112 #define MDM_UL2 0x0008 113 #define DIAG_DL1 0x0010 114 #define DIAG_DL2 0x0020 115 #define DIAG_UL 0x0040 116 #define APP1_DL 0x0080 117 #define APP1_UL 0x0100 118 #define APP2_DL 0x0200 119 #define APP2_UL 0x0400 120 #define CTRL_DL 0x0800 121 #define CTRL_UL 0x1000 122 #define RESET 0x8000 123 124 #define MDM_DL (MDM_DL1 | MDM_DL2) 125 #define MDM_UL (MDM_UL1 | MDM_UL2) 126 #define DIAG_DL (DIAG_DL1 | DIAG_DL2) 127 128 /* modem signal definition */ 129 #define CTRL_DSR 0x0001 130 #define CTRL_DCD 0x0002 131 #define CTRL_RI 0x0004 132 #define CTRL_CTS 0x0008 133 134 #define CTRL_DTR 0x0001 135 #define CTRL_RTS 0x0002 136 137 #define MAX_PORT 4 138 #define NOZOMI_MAX_PORTS 5 139 #define NOZOMI_MAX_CARDS (NTTY_TTY_MAXMINORS / MAX_PORT) 140 141 /* Type definitions */ 142 143 /* 144 * There are two types of nozomi cards, 145 * one with 2048 memory and with 8192 memory 146 */ 147 enum card_type { 148 F32_2 = 2048, /* 512 bytes downlink + uplink * 2 -> 2048 */ 149 F32_8 = 8192, /* 3072 bytes downl. + 1024 bytes uplink * 2 -> 8192 */ 150 }; 151 152 /* Initialization states a card can be in */ 153 enum card_state { 154 NOZOMI_STATE_UNKNOWN = 0, 155 NOZOMI_STATE_ENABLED = 1, /* pci device enabled */ 156 NOZOMI_STATE_ALLOCATED = 2, /* config setup done */ 157 NOZOMI_STATE_READY = 3, /* flowcontrols received */ 158 }; 159 160 /* Two different toggle channels exist */ 161 enum channel_type { 162 CH_A = 0, 163 CH_B = 1, 164 }; 165 166 /* Port definition for the card regarding flow control */ 167 enum ctrl_port_type { 168 CTRL_CMD = 0, 169 CTRL_MDM = 1, 170 CTRL_DIAG = 2, 171 CTRL_APP1 = 3, 172 CTRL_APP2 = 4, 173 CTRL_ERROR = -1, 174 }; 175 176 /* Ports that the nozomi has */ 177 enum port_type { 178 PORT_MDM = 0, 179 PORT_DIAG = 1, 180 PORT_APP1 = 2, 181 PORT_APP2 = 3, 182 PORT_CTRL = 4, 183 PORT_ERROR = -1, 184 }; 185 186 #ifdef __BIG_ENDIAN 187 /* Big endian */ 188 189 struct toggles { 190 unsigned int enabled:5; /* 191 * Toggle fields are valid if enabled is 0, 192 * else A-channels must always be used. 193 */ 194 unsigned int diag_dl:1; 195 unsigned int mdm_dl:1; 196 unsigned int mdm_ul:1; 197 } __attribute__ ((packed)); 198 199 /* Configuration table to read at startup of card */ 200 /* Is for now only needed during initialization phase */ 201 struct config_table { 202 u32 signature; 203 u16 product_information; 204 u16 version; 205 u8 pad3[3]; 206 struct toggles toggle; 207 u8 pad1[4]; 208 u16 dl_mdm_len1; /* 209 * If this is 64, it can hold 210 * 60 bytes + 4 that is length field 211 */ 212 u16 dl_start; 213 214 u16 dl_diag_len1; 215 u16 dl_mdm_len2; /* 216 * If this is 64, it can hold 217 * 60 bytes + 4 that is length field 218 */ 219 u16 dl_app1_len; 220 221 u16 dl_diag_len2; 222 u16 dl_ctrl_len; 223 u16 dl_app2_len; 224 u8 pad2[16]; 225 u16 ul_mdm_len1; 226 u16 ul_start; 227 u16 ul_diag_len; 228 u16 ul_mdm_len2; 229 u16 ul_app1_len; 230 u16 ul_app2_len; 231 u16 ul_ctrl_len; 232 } __attribute__ ((packed)); 233 234 /* This stores all control downlink flags */ 235 struct ctrl_dl { 236 u8 port; 237 unsigned int reserved:4; 238 unsigned int CTS:1; 239 unsigned int RI:1; 240 unsigned int DCD:1; 241 unsigned int DSR:1; 242 } __attribute__ ((packed)); 243 244 /* This stores all control uplink flags */ 245 struct ctrl_ul { 246 u8 port; 247 unsigned int reserved:6; 248 unsigned int RTS:1; 249 unsigned int DTR:1; 250 } __attribute__ ((packed)); 251 252 #else 253 /* Little endian */ 254 255 /* This represents the toggle information */ 256 struct toggles { 257 unsigned int mdm_ul:1; 258 unsigned int mdm_dl:1; 259 unsigned int diag_dl:1; 260 unsigned int enabled:5; /* 261 * Toggle fields are valid if enabled is 0, 262 * else A-channels must always be used. 263 */ 264 } __attribute__ ((packed)); 265 266 /* Configuration table to read at startup of card */ 267 struct config_table { 268 u32 signature; 269 u16 version; 270 u16 product_information; 271 struct toggles toggle; 272 u8 pad1[7]; 273 u16 dl_start; 274 u16 dl_mdm_len1; /* 275 * If this is 64, it can hold 276 * 60 bytes + 4 that is length field 277 */ 278 u16 dl_mdm_len2; 279 u16 dl_diag_len1; 280 u16 dl_diag_len2; 281 u16 dl_app1_len; 282 u16 dl_app2_len; 283 u16 dl_ctrl_len; 284 u8 pad2[16]; 285 u16 ul_start; 286 u16 ul_mdm_len2; 287 u16 ul_mdm_len1; 288 u16 ul_diag_len; 289 u16 ul_app1_len; 290 u16 ul_app2_len; 291 u16 ul_ctrl_len; 292 } __attribute__ ((packed)); 293 294 /* This stores all control downlink flags */ 295 struct ctrl_dl { 296 unsigned int DSR:1; 297 unsigned int DCD:1; 298 unsigned int RI:1; 299 unsigned int CTS:1; 300 unsigned int reserved:4; 301 u8 port; 302 } __attribute__ ((packed)); 303 304 /* This stores all control uplink flags */ 305 struct ctrl_ul { 306 unsigned int DTR:1; 307 unsigned int RTS:1; 308 unsigned int reserved:6; 309 u8 port; 310 } __attribute__ ((packed)); 311 #endif 312 313 /* This holds all information that is needed regarding a port */ 314 struct port { 315 struct tty_port port; 316 u8 update_flow_control; 317 struct ctrl_ul ctrl_ul; 318 struct ctrl_dl ctrl_dl; 319 struct kfifo fifo_ul; 320 void __iomem *dl_addr[2]; 321 u32 dl_size[2]; 322 u8 toggle_dl; 323 void __iomem *ul_addr[2]; 324 u32 ul_size[2]; 325 u8 toggle_ul; 326 u16 token_dl; 327 328 wait_queue_head_t tty_wait; 329 struct async_icount tty_icount; 330 331 struct nozomi *dc; 332 }; 333 334 /* Private data one for each card in the system */ 335 struct nozomi { 336 void __iomem *base_addr; 337 unsigned long flip; 338 339 /* Pointers to registers */ 340 void __iomem *reg_iir; 341 void __iomem *reg_fcr; 342 void __iomem *reg_ier; 343 344 u16 last_ier; 345 enum card_type card_type; 346 struct config_table config_table; /* Configuration table */ 347 struct pci_dev *pdev; 348 struct port port[NOZOMI_MAX_PORTS]; 349 u8 *send_buf; 350 351 spinlock_t spin_mutex; /* secures access to registers and tty */ 352 353 unsigned int index_start; 354 enum card_state state; 355 u32 open_ttys; 356 }; 357 358 /* Global variables */ 359 static const struct pci_device_id nozomi_pci_tbl[] = { 360 {PCI_DEVICE(0x1931, 0x000c)}, /* Nozomi HSDPA */ 361 {}, 362 }; 363 364 MODULE_DEVICE_TABLE(pci, nozomi_pci_tbl); 365 366 static struct nozomi *ndevs[NOZOMI_MAX_CARDS]; 367 static struct tty_driver *ntty_driver; 368 369 static const struct tty_port_operations noz_tty_port_ops; 370 371 /* 372 * find card by tty_index 373 */ 374 static inline struct nozomi *get_dc_by_tty(const struct tty_struct *tty) 375 { 376 return tty ? ndevs[tty->index / MAX_PORT] : NULL; 377 } 378 379 static inline struct port *get_port_by_tty(const struct tty_struct *tty) 380 { 381 struct nozomi *ndev = get_dc_by_tty(tty); 382 return ndev ? &ndev->port[tty->index % MAX_PORT] : NULL; 383 } 384 385 /* 386 * TODO: 387 * -Optimize 388 * -Rewrite cleaner 389 */ 390 391 static void read_mem32(u32 *buf, const void __iomem *mem_addr_start, 392 u32 size_bytes) 393 { 394 u32 i = 0; 395 const u32 __iomem *ptr = mem_addr_start; 396 u16 *buf16; 397 398 if (unlikely(!ptr || !buf)) 399 goto out; 400 401 /* shortcut for extremely often used cases */ 402 switch (size_bytes) { 403 case 2: /* 2 bytes */ 404 buf16 = (u16 *) buf; 405 *buf16 = __le16_to_cpu(readw(ptr)); 406 goto out; 407 case 4: /* 4 bytes */ 408 *(buf) = __le32_to_cpu(readl(ptr)); 409 goto out; 410 } 411 412 while (i < size_bytes) { 413 if (size_bytes - i == 2) { 414 /* Handle 2 bytes in the end */ 415 buf16 = (u16 *) buf; 416 *(buf16) = __le16_to_cpu(readw(ptr)); 417 i += 2; 418 } else { 419 /* Read 4 bytes */ 420 *(buf) = __le32_to_cpu(readl(ptr)); 421 i += 4; 422 } 423 buf++; 424 ptr++; 425 } 426 out: 427 return; 428 } 429 430 /* 431 * TODO: 432 * -Optimize 433 * -Rewrite cleaner 434 */ 435 static u32 write_mem32(void __iomem *mem_addr_start, const u32 *buf, 436 u32 size_bytes) 437 { 438 u32 i = 0; 439 u32 __iomem *ptr = mem_addr_start; 440 const u16 *buf16; 441 442 if (unlikely(!ptr || !buf)) 443 return 0; 444 445 /* shortcut for extremely often used cases */ 446 switch (size_bytes) { 447 case 2: /* 2 bytes */ 448 buf16 = (const u16 *)buf; 449 writew(__cpu_to_le16(*buf16), ptr); 450 return 2; 451 case 1: /* 452 * also needs to write 4 bytes in this case 453 * so falling through.. 454 */ 455 fallthrough; 456 case 4: /* 4 bytes */ 457 writel(__cpu_to_le32(*buf), ptr); 458 return 4; 459 } 460 461 while (i < size_bytes) { 462 if (size_bytes - i == 2) { 463 /* 2 bytes */ 464 buf16 = (const u16 *)buf; 465 writew(__cpu_to_le16(*buf16), ptr); 466 i += 2; 467 } else { 468 /* 4 bytes */ 469 writel(__cpu_to_le32(*buf), ptr); 470 i += 4; 471 } 472 buf++; 473 ptr++; 474 } 475 return i; 476 } 477 478 /* Setup pointers to different channels and also setup buffer sizes. */ 479 static void nozomi_setup_memory(struct nozomi *dc) 480 { 481 void __iomem *offset = dc->base_addr + dc->config_table.dl_start; 482 /* The length reported is including the length field of 4 bytes, 483 * hence subtract with 4. 484 */ 485 const u16 buff_offset = 4; 486 487 /* Modem port dl configuration */ 488 dc->port[PORT_MDM].dl_addr[CH_A] = offset; 489 dc->port[PORT_MDM].dl_addr[CH_B] = 490 (offset += dc->config_table.dl_mdm_len1); 491 dc->port[PORT_MDM].dl_size[CH_A] = 492 dc->config_table.dl_mdm_len1 - buff_offset; 493 dc->port[PORT_MDM].dl_size[CH_B] = 494 dc->config_table.dl_mdm_len2 - buff_offset; 495 496 /* Diag port dl configuration */ 497 dc->port[PORT_DIAG].dl_addr[CH_A] = 498 (offset += dc->config_table.dl_mdm_len2); 499 dc->port[PORT_DIAG].dl_size[CH_A] = 500 dc->config_table.dl_diag_len1 - buff_offset; 501 dc->port[PORT_DIAG].dl_addr[CH_B] = 502 (offset += dc->config_table.dl_diag_len1); 503 dc->port[PORT_DIAG].dl_size[CH_B] = 504 dc->config_table.dl_diag_len2 - buff_offset; 505 506 /* App1 port dl configuration */ 507 dc->port[PORT_APP1].dl_addr[CH_A] = 508 (offset += dc->config_table.dl_diag_len2); 509 dc->port[PORT_APP1].dl_size[CH_A] = 510 dc->config_table.dl_app1_len - buff_offset; 511 512 /* App2 port dl configuration */ 513 dc->port[PORT_APP2].dl_addr[CH_A] = 514 (offset += dc->config_table.dl_app1_len); 515 dc->port[PORT_APP2].dl_size[CH_A] = 516 dc->config_table.dl_app2_len - buff_offset; 517 518 /* Ctrl dl configuration */ 519 dc->port[PORT_CTRL].dl_addr[CH_A] = 520 (offset += dc->config_table.dl_app2_len); 521 dc->port[PORT_CTRL].dl_size[CH_A] = 522 dc->config_table.dl_ctrl_len - buff_offset; 523 524 offset = dc->base_addr + dc->config_table.ul_start; 525 526 /* Modem Port ul configuration */ 527 dc->port[PORT_MDM].ul_addr[CH_A] = offset; 528 dc->port[PORT_MDM].ul_size[CH_A] = 529 dc->config_table.ul_mdm_len1 - buff_offset; 530 dc->port[PORT_MDM].ul_addr[CH_B] = 531 (offset += dc->config_table.ul_mdm_len1); 532 dc->port[PORT_MDM].ul_size[CH_B] = 533 dc->config_table.ul_mdm_len2 - buff_offset; 534 535 /* Diag port ul configuration */ 536 dc->port[PORT_DIAG].ul_addr[CH_A] = 537 (offset += dc->config_table.ul_mdm_len2); 538 dc->port[PORT_DIAG].ul_size[CH_A] = 539 dc->config_table.ul_diag_len - buff_offset; 540 541 /* App1 port ul configuration */ 542 dc->port[PORT_APP1].ul_addr[CH_A] = 543 (offset += dc->config_table.ul_diag_len); 544 dc->port[PORT_APP1].ul_size[CH_A] = 545 dc->config_table.ul_app1_len - buff_offset; 546 547 /* App2 port ul configuration */ 548 dc->port[PORT_APP2].ul_addr[CH_A] = 549 (offset += dc->config_table.ul_app1_len); 550 dc->port[PORT_APP2].ul_size[CH_A] = 551 dc->config_table.ul_app2_len - buff_offset; 552 553 /* Ctrl ul configuration */ 554 dc->port[PORT_CTRL].ul_addr[CH_A] = 555 (offset += dc->config_table.ul_app2_len); 556 dc->port[PORT_CTRL].ul_size[CH_A] = 557 dc->config_table.ul_ctrl_len - buff_offset; 558 } 559 560 /* Dump config table under initalization phase */ 561 #ifdef DEBUG 562 static void dump_table(const struct nozomi *dc) 563 { 564 DBG3("signature: 0x%08X", dc->config_table.signature); 565 DBG3("version: 0x%04X", dc->config_table.version); 566 DBG3("product_information: 0x%04X", \ 567 dc->config_table.product_information); 568 DBG3("toggle enabled: %d", dc->config_table.toggle.enabled); 569 DBG3("toggle up_mdm: %d", dc->config_table.toggle.mdm_ul); 570 DBG3("toggle dl_mdm: %d", dc->config_table.toggle.mdm_dl); 571 DBG3("toggle dl_dbg: %d", dc->config_table.toggle.diag_dl); 572 573 DBG3("dl_start: 0x%04X", dc->config_table.dl_start); 574 DBG3("dl_mdm_len0: 0x%04X, %d", dc->config_table.dl_mdm_len1, 575 dc->config_table.dl_mdm_len1); 576 DBG3("dl_mdm_len1: 0x%04X, %d", dc->config_table.dl_mdm_len2, 577 dc->config_table.dl_mdm_len2); 578 DBG3("dl_diag_len0: 0x%04X, %d", dc->config_table.dl_diag_len1, 579 dc->config_table.dl_diag_len1); 580 DBG3("dl_diag_len1: 0x%04X, %d", dc->config_table.dl_diag_len2, 581 dc->config_table.dl_diag_len2); 582 DBG3("dl_app1_len: 0x%04X, %d", dc->config_table.dl_app1_len, 583 dc->config_table.dl_app1_len); 584 DBG3("dl_app2_len: 0x%04X, %d", dc->config_table.dl_app2_len, 585 dc->config_table.dl_app2_len); 586 DBG3("dl_ctrl_len: 0x%04X, %d", dc->config_table.dl_ctrl_len, 587 dc->config_table.dl_ctrl_len); 588 DBG3("ul_start: 0x%04X, %d", dc->config_table.ul_start, 589 dc->config_table.ul_start); 590 DBG3("ul_mdm_len[0]: 0x%04X, %d", dc->config_table.ul_mdm_len1, 591 dc->config_table.ul_mdm_len1); 592 DBG3("ul_mdm_len[1]: 0x%04X, %d", dc->config_table.ul_mdm_len2, 593 dc->config_table.ul_mdm_len2); 594 DBG3("ul_diag_len: 0x%04X, %d", dc->config_table.ul_diag_len, 595 dc->config_table.ul_diag_len); 596 DBG3("ul_app1_len: 0x%04X, %d", dc->config_table.ul_app1_len, 597 dc->config_table.ul_app1_len); 598 DBG3("ul_app2_len: 0x%04X, %d", dc->config_table.ul_app2_len, 599 dc->config_table.ul_app2_len); 600 DBG3("ul_ctrl_len: 0x%04X, %d", dc->config_table.ul_ctrl_len, 601 dc->config_table.ul_ctrl_len); 602 } 603 #else 604 static inline void dump_table(const struct nozomi *dc) { } 605 #endif 606 607 /* 608 * Read configuration table from card under intalization phase 609 * Returns 1 if ok, else 0 610 */ 611 static int nozomi_read_config_table(struct nozomi *dc) 612 { 613 read_mem32((u32 *) &dc->config_table, dc->base_addr + 0, 614 sizeof(struct config_table)); 615 616 if (dc->config_table.signature != NOZOMI_CONFIG_MAGIC) { 617 dev_err(&dc->pdev->dev, "ConfigTable Bad! 0x%08X != 0x%08X\n", 618 dc->config_table.signature, NOZOMI_CONFIG_MAGIC); 619 return 0; 620 } 621 622 if ((dc->config_table.version == 0) 623 || (dc->config_table.toggle.enabled == TOGGLE_VALID)) { 624 int i; 625 DBG1("Second phase, configuring card"); 626 627 nozomi_setup_memory(dc); 628 629 dc->port[PORT_MDM].toggle_ul = dc->config_table.toggle.mdm_ul; 630 dc->port[PORT_MDM].toggle_dl = dc->config_table.toggle.mdm_dl; 631 dc->port[PORT_DIAG].toggle_dl = dc->config_table.toggle.diag_dl; 632 DBG1("toggle ports: MDM UL:%d MDM DL:%d, DIAG DL:%d", 633 dc->port[PORT_MDM].toggle_ul, 634 dc->port[PORT_MDM].toggle_dl, dc->port[PORT_DIAG].toggle_dl); 635 636 dump_table(dc); 637 638 for (i = PORT_MDM; i < MAX_PORT; i++) { 639 memset(&dc->port[i].ctrl_dl, 0, sizeof(struct ctrl_dl)); 640 memset(&dc->port[i].ctrl_ul, 0, sizeof(struct ctrl_ul)); 641 } 642 643 /* Enable control channel */ 644 dc->last_ier = dc->last_ier | CTRL_DL; 645 writew(dc->last_ier, dc->reg_ier); 646 647 dc->state = NOZOMI_STATE_ALLOCATED; 648 dev_info(&dc->pdev->dev, "Initialization OK!\n"); 649 return 1; 650 } 651 652 if ((dc->config_table.version > 0) 653 && (dc->config_table.toggle.enabled != TOGGLE_VALID)) { 654 u32 offset = 0; 655 DBG1("First phase: pushing upload buffers, clearing download"); 656 657 dev_info(&dc->pdev->dev, "Version of card: %d\n", 658 dc->config_table.version); 659 660 /* Here we should disable all I/O over F32. */ 661 nozomi_setup_memory(dc); 662 663 /* 664 * We should send ALL channel pair tokens back along 665 * with reset token 666 */ 667 668 /* push upload modem buffers */ 669 write_mem32(dc->port[PORT_MDM].ul_addr[CH_A], 670 (u32 *) &offset, 4); 671 write_mem32(dc->port[PORT_MDM].ul_addr[CH_B], 672 (u32 *) &offset, 4); 673 674 writew(MDM_UL | DIAG_DL | MDM_DL, dc->reg_fcr); 675 676 DBG1("First phase done"); 677 } 678 679 return 1; 680 } 681 682 /* Enable uplink interrupts */ 683 static void enable_transmit_ul(enum port_type port, struct nozomi *dc) 684 { 685 static const u16 mask[] = {MDM_UL, DIAG_UL, APP1_UL, APP2_UL, CTRL_UL}; 686 687 if (port < NOZOMI_MAX_PORTS) { 688 dc->last_ier |= mask[port]; 689 writew(dc->last_ier, dc->reg_ier); 690 } else { 691 dev_err(&dc->pdev->dev, "Called with wrong port?\n"); 692 } 693 } 694 695 /* Disable uplink interrupts */ 696 static void disable_transmit_ul(enum port_type port, struct nozomi *dc) 697 { 698 static const u16 mask[] = 699 {~MDM_UL, ~DIAG_UL, ~APP1_UL, ~APP2_UL, ~CTRL_UL}; 700 701 if (port < NOZOMI_MAX_PORTS) { 702 dc->last_ier &= mask[port]; 703 writew(dc->last_ier, dc->reg_ier); 704 } else { 705 dev_err(&dc->pdev->dev, "Called with wrong port?\n"); 706 } 707 } 708 709 /* Enable downlink interrupts */ 710 static void enable_transmit_dl(enum port_type port, struct nozomi *dc) 711 { 712 static const u16 mask[] = {MDM_DL, DIAG_DL, APP1_DL, APP2_DL, CTRL_DL}; 713 714 if (port < NOZOMI_MAX_PORTS) { 715 dc->last_ier |= mask[port]; 716 writew(dc->last_ier, dc->reg_ier); 717 } else { 718 dev_err(&dc->pdev->dev, "Called with wrong port?\n"); 719 } 720 } 721 722 /* Disable downlink interrupts */ 723 static void disable_transmit_dl(enum port_type port, struct nozomi *dc) 724 { 725 static const u16 mask[] = 726 {~MDM_DL, ~DIAG_DL, ~APP1_DL, ~APP2_DL, ~CTRL_DL}; 727 728 if (port < NOZOMI_MAX_PORTS) { 729 dc->last_ier &= mask[port]; 730 writew(dc->last_ier, dc->reg_ier); 731 } else { 732 dev_err(&dc->pdev->dev, "Called with wrong port?\n"); 733 } 734 } 735 736 /* 737 * Return 1 - send buffer to card and ack. 738 * Return 0 - don't ack, don't send buffer to card. 739 */ 740 static int send_data(enum port_type index, struct nozomi *dc) 741 { 742 u32 size = 0; 743 struct port *port = &dc->port[index]; 744 const u8 toggle = port->toggle_ul; 745 void __iomem *addr = port->ul_addr[toggle]; 746 const u32 ul_size = port->ul_size[toggle]; 747 748 /* Get data from tty and place in buf for now */ 749 size = kfifo_out(&port->fifo_ul, dc->send_buf, 750 ul_size < SEND_BUF_MAX ? ul_size : SEND_BUF_MAX); 751 752 if (size == 0) { 753 DBG4("No more data to send, disable link:"); 754 return 0; 755 } 756 757 /* DUMP(buf, size); */ 758 759 /* Write length + data */ 760 write_mem32(addr, (u32 *) &size, 4); 761 write_mem32(addr + 4, (u32 *) dc->send_buf, size); 762 763 tty_port_tty_wakeup(&port->port); 764 765 return 1; 766 } 767 768 /* If all data has been read, return 1, else 0 */ 769 static int receive_data(enum port_type index, struct nozomi *dc) 770 { 771 u8 buf[RECEIVE_BUF_MAX] = { 0 }; 772 int size; 773 u32 offset = 4; 774 struct port *port = &dc->port[index]; 775 void __iomem *addr = port->dl_addr[port->toggle_dl]; 776 struct tty_struct *tty = tty_port_tty_get(&port->port); 777 int i, ret; 778 779 size = __le32_to_cpu(readl(addr)); 780 781 if (tty && tty_throttled(tty)) { 782 DBG1("No room in tty, don't read data, don't ack interrupt, " 783 "disable interrupt"); 784 785 /* disable interrupt in downlink... */ 786 disable_transmit_dl(index, dc); 787 ret = 0; 788 goto put; 789 } 790 791 if (unlikely(size == 0)) { 792 dev_err(&dc->pdev->dev, "size == 0?\n"); 793 ret = 1; 794 goto put; 795 } 796 797 while (size > 0) { 798 read_mem32((u32 *) buf, addr + offset, RECEIVE_BUF_MAX); 799 800 if (size == 1) { 801 tty_insert_flip_char(&port->port, buf[0], TTY_NORMAL); 802 size = 0; 803 } else if (size < RECEIVE_BUF_MAX) { 804 size -= tty_insert_flip_string(&port->port, 805 (char *)buf, size); 806 } else { 807 i = tty_insert_flip_string(&port->port, 808 (char *)buf, RECEIVE_BUF_MAX); 809 size -= i; 810 offset += i; 811 } 812 } 813 814 set_bit(index, &dc->flip); 815 ret = 1; 816 put: 817 tty_kref_put(tty); 818 return ret; 819 } 820 821 /* Debug for interrupts */ 822 #ifdef DEBUG 823 static char *interrupt2str(u16 interrupt) 824 { 825 static char buf[TMP_BUF_MAX]; 826 char *p = buf; 827 828 if (interrupt & MDM_DL1) 829 p += scnprintf(p, TMP_BUF_MAX, "MDM_DL1 "); 830 if (interrupt & MDM_DL2) 831 p += scnprintf(p, TMP_BUF_MAX - (p - buf), "MDM_DL2 "); 832 if (interrupt & MDM_UL1) 833 p += scnprintf(p, TMP_BUF_MAX - (p - buf), "MDM_UL1 "); 834 if (interrupt & MDM_UL2) 835 p += scnprintf(p, TMP_BUF_MAX - (p - buf), "MDM_UL2 "); 836 if (interrupt & DIAG_DL1) 837 p += scnprintf(p, TMP_BUF_MAX - (p - buf), "DIAG_DL1 "); 838 if (interrupt & DIAG_DL2) 839 p += scnprintf(p, TMP_BUF_MAX - (p - buf), "DIAG_DL2 "); 840 841 if (interrupt & DIAG_UL) 842 p += scnprintf(p, TMP_BUF_MAX - (p - buf), "DIAG_UL "); 843 844 if (interrupt & APP1_DL) 845 p += scnprintf(p, TMP_BUF_MAX - (p - buf), "APP1_DL "); 846 if (interrupt & APP2_DL) 847 p += scnprintf(p, TMP_BUF_MAX - (p - buf), "APP2_DL "); 848 849 if (interrupt & APP1_UL) 850 p += scnprintf(p, TMP_BUF_MAX - (p - buf), "APP1_UL "); 851 if (interrupt & APP2_UL) 852 p += scnprintf(p, TMP_BUF_MAX - (p - buf), "APP2_UL "); 853 854 if (interrupt & CTRL_DL) 855 p += scnprintf(p, TMP_BUF_MAX - (p - buf), "CTRL_DL "); 856 if (interrupt & CTRL_UL) 857 p += scnprintf(p, TMP_BUF_MAX - (p - buf), "CTRL_UL "); 858 859 if (interrupt & RESET) 860 p += scnprintf(p, TMP_BUF_MAX - (p - buf), "RESET "); 861 862 return buf; 863 } 864 #endif 865 866 /* 867 * Receive flow control 868 * Return 1 - If ok, else 0 869 */ 870 static int receive_flow_control(struct nozomi *dc) 871 { 872 enum port_type port = PORT_MDM; 873 struct ctrl_dl ctrl_dl; 874 struct ctrl_dl old_ctrl; 875 u16 enable_ier = 0; 876 877 read_mem32((u32 *) &ctrl_dl, dc->port[PORT_CTRL].dl_addr[CH_A], 2); 878 879 switch (ctrl_dl.port) { 880 case CTRL_CMD: 881 DBG1("The Base Band sends this value as a response to a " 882 "request for IMSI detach sent over the control " 883 "channel uplink (see section 7.6.1)."); 884 break; 885 case CTRL_MDM: 886 port = PORT_MDM; 887 enable_ier = MDM_DL; 888 break; 889 case CTRL_DIAG: 890 port = PORT_DIAG; 891 enable_ier = DIAG_DL; 892 break; 893 case CTRL_APP1: 894 port = PORT_APP1; 895 enable_ier = APP1_DL; 896 break; 897 case CTRL_APP2: 898 port = PORT_APP2; 899 enable_ier = APP2_DL; 900 if (dc->state == NOZOMI_STATE_ALLOCATED) { 901 /* 902 * After card initialization the flow control 903 * received for APP2 is always the last 904 */ 905 dc->state = NOZOMI_STATE_READY; 906 dev_info(&dc->pdev->dev, "Device READY!\n"); 907 } 908 break; 909 default: 910 dev_err(&dc->pdev->dev, 911 "ERROR: flow control received for non-existing port\n"); 912 return 0; 913 } 914 915 DBG1("0x%04X->0x%04X", *((u16 *)&dc->port[port].ctrl_dl), 916 *((u16 *)&ctrl_dl)); 917 918 old_ctrl = dc->port[port].ctrl_dl; 919 dc->port[port].ctrl_dl = ctrl_dl; 920 921 if (old_ctrl.CTS == 1 && ctrl_dl.CTS == 0) { 922 DBG1("Disable interrupt (0x%04X) on port: %d", 923 enable_ier, port); 924 disable_transmit_ul(port, dc); 925 926 } else if (old_ctrl.CTS == 0 && ctrl_dl.CTS == 1) { 927 928 if (kfifo_len(&dc->port[port].fifo_ul)) { 929 DBG1("Enable interrupt (0x%04X) on port: %d", 930 enable_ier, port); 931 DBG1("Data in buffer [%d], enable transmit! ", 932 kfifo_len(&dc->port[port].fifo_ul)); 933 enable_transmit_ul(port, dc); 934 } else { 935 DBG1("No data in buffer..."); 936 } 937 } 938 939 if (*(u16 *)&old_ctrl == *(u16 *)&ctrl_dl) { 940 DBG1(" No change in mctrl"); 941 return 1; 942 } 943 /* Update statistics */ 944 if (old_ctrl.CTS != ctrl_dl.CTS) 945 dc->port[port].tty_icount.cts++; 946 if (old_ctrl.DSR != ctrl_dl.DSR) 947 dc->port[port].tty_icount.dsr++; 948 if (old_ctrl.RI != ctrl_dl.RI) 949 dc->port[port].tty_icount.rng++; 950 if (old_ctrl.DCD != ctrl_dl.DCD) 951 dc->port[port].tty_icount.dcd++; 952 953 wake_up_interruptible(&dc->port[port].tty_wait); 954 955 DBG1("port: %d DCD(%d), CTS(%d), RI(%d), DSR(%d)", 956 port, 957 dc->port[port].tty_icount.dcd, dc->port[port].tty_icount.cts, 958 dc->port[port].tty_icount.rng, dc->port[port].tty_icount.dsr); 959 960 return 1; 961 } 962 963 static enum ctrl_port_type port2ctrl(enum port_type port, 964 const struct nozomi *dc) 965 { 966 switch (port) { 967 case PORT_MDM: 968 return CTRL_MDM; 969 case PORT_DIAG: 970 return CTRL_DIAG; 971 case PORT_APP1: 972 return CTRL_APP1; 973 case PORT_APP2: 974 return CTRL_APP2; 975 default: 976 dev_err(&dc->pdev->dev, 977 "ERROR: send flow control " \ 978 "received for non-existing port\n"); 979 } 980 return CTRL_ERROR; 981 } 982 983 /* 984 * Send flow control, can only update one channel at a time 985 * Return 0 - If we have updated all flow control 986 * Return 1 - If we need to update more flow control, ack current enable more 987 */ 988 static int send_flow_control(struct nozomi *dc) 989 { 990 u32 i, more_flow_control_to_be_updated = 0; 991 u16 *ctrl; 992 993 for (i = PORT_MDM; i < MAX_PORT; i++) { 994 if (dc->port[i].update_flow_control) { 995 if (more_flow_control_to_be_updated) { 996 /* We have more flow control to be updated */ 997 return 1; 998 } 999 dc->port[i].ctrl_ul.port = port2ctrl(i, dc); 1000 ctrl = (u16 *)&dc->port[i].ctrl_ul; 1001 write_mem32(dc->port[PORT_CTRL].ul_addr[0], \ 1002 (u32 *) ctrl, 2); 1003 dc->port[i].update_flow_control = 0; 1004 more_flow_control_to_be_updated = 1; 1005 } 1006 } 1007 return 0; 1008 } 1009 1010 /* 1011 * Handle downlink data, ports that are handled are modem and diagnostics 1012 * Return 1 - ok 1013 * Return 0 - toggle fields are out of sync 1014 */ 1015 static int handle_data_dl(struct nozomi *dc, enum port_type port, u8 *toggle, 1016 u16 read_iir, u16 mask1, u16 mask2) 1017 { 1018 if (*toggle == 0 && read_iir & mask1) { 1019 if (receive_data(port, dc)) { 1020 writew(mask1, dc->reg_fcr); 1021 *toggle = !(*toggle); 1022 } 1023 1024 if (read_iir & mask2) { 1025 if (receive_data(port, dc)) { 1026 writew(mask2, dc->reg_fcr); 1027 *toggle = !(*toggle); 1028 } 1029 } 1030 } else if (*toggle == 1 && read_iir & mask2) { 1031 if (receive_data(port, dc)) { 1032 writew(mask2, dc->reg_fcr); 1033 *toggle = !(*toggle); 1034 } 1035 1036 if (read_iir & mask1) { 1037 if (receive_data(port, dc)) { 1038 writew(mask1, dc->reg_fcr); 1039 *toggle = !(*toggle); 1040 } 1041 } 1042 } else { 1043 dev_err(&dc->pdev->dev, "port out of sync!, toggle:%d\n", 1044 *toggle); 1045 return 0; 1046 } 1047 return 1; 1048 } 1049 1050 /* 1051 * Handle uplink data, this is currently for the modem port 1052 * Return 1 - ok 1053 * Return 0 - toggle field are out of sync 1054 */ 1055 static int handle_data_ul(struct nozomi *dc, enum port_type port, u16 read_iir) 1056 { 1057 u8 *toggle = &(dc->port[port].toggle_ul); 1058 1059 if (*toggle == 0 && read_iir & MDM_UL1) { 1060 dc->last_ier &= ~MDM_UL; 1061 writew(dc->last_ier, dc->reg_ier); 1062 if (send_data(port, dc)) { 1063 writew(MDM_UL1, dc->reg_fcr); 1064 dc->last_ier = dc->last_ier | MDM_UL; 1065 writew(dc->last_ier, dc->reg_ier); 1066 *toggle = !*toggle; 1067 } 1068 1069 if (read_iir & MDM_UL2) { 1070 dc->last_ier &= ~MDM_UL; 1071 writew(dc->last_ier, dc->reg_ier); 1072 if (send_data(port, dc)) { 1073 writew(MDM_UL2, dc->reg_fcr); 1074 dc->last_ier = dc->last_ier | MDM_UL; 1075 writew(dc->last_ier, dc->reg_ier); 1076 *toggle = !*toggle; 1077 } 1078 } 1079 1080 } else if (*toggle == 1 && read_iir & MDM_UL2) { 1081 dc->last_ier &= ~MDM_UL; 1082 writew(dc->last_ier, dc->reg_ier); 1083 if (send_data(port, dc)) { 1084 writew(MDM_UL2, dc->reg_fcr); 1085 dc->last_ier = dc->last_ier | MDM_UL; 1086 writew(dc->last_ier, dc->reg_ier); 1087 *toggle = !*toggle; 1088 } 1089 1090 if (read_iir & MDM_UL1) { 1091 dc->last_ier &= ~MDM_UL; 1092 writew(dc->last_ier, dc->reg_ier); 1093 if (send_data(port, dc)) { 1094 writew(MDM_UL1, dc->reg_fcr); 1095 dc->last_ier = dc->last_ier | MDM_UL; 1096 writew(dc->last_ier, dc->reg_ier); 1097 *toggle = !*toggle; 1098 } 1099 } 1100 } else { 1101 writew(read_iir & MDM_UL, dc->reg_fcr); 1102 dev_err(&dc->pdev->dev, "port out of sync!\n"); 1103 return 0; 1104 } 1105 return 1; 1106 } 1107 1108 static irqreturn_t interrupt_handler(int irq, void *dev_id) 1109 { 1110 struct nozomi *dc = dev_id; 1111 unsigned int a; 1112 u16 read_iir; 1113 1114 if (!dc) 1115 return IRQ_NONE; 1116 1117 spin_lock(&dc->spin_mutex); 1118 read_iir = readw(dc->reg_iir); 1119 1120 /* Card removed */ 1121 if (read_iir == (u16)-1) 1122 goto none; 1123 /* 1124 * Just handle interrupt enabled in IER 1125 * (by masking with dc->last_ier) 1126 */ 1127 read_iir &= dc->last_ier; 1128 1129 if (read_iir == 0) 1130 goto none; 1131 1132 1133 DBG4("%s irq:0x%04X, prev:0x%04X", interrupt2str(read_iir), read_iir, 1134 dc->last_ier); 1135 1136 if (read_iir & RESET) { 1137 if (unlikely(!nozomi_read_config_table(dc))) { 1138 dc->last_ier = 0x0; 1139 writew(dc->last_ier, dc->reg_ier); 1140 dev_err(&dc->pdev->dev, "Could not read status from " 1141 "card, we should disable interface\n"); 1142 } else { 1143 writew(RESET, dc->reg_fcr); 1144 } 1145 /* No more useful info if this was the reset interrupt. */ 1146 goto exit_handler; 1147 } 1148 if (read_iir & CTRL_UL) { 1149 DBG1("CTRL_UL"); 1150 dc->last_ier &= ~CTRL_UL; 1151 writew(dc->last_ier, dc->reg_ier); 1152 if (send_flow_control(dc)) { 1153 writew(CTRL_UL, dc->reg_fcr); 1154 dc->last_ier = dc->last_ier | CTRL_UL; 1155 writew(dc->last_ier, dc->reg_ier); 1156 } 1157 } 1158 if (read_iir & CTRL_DL) { 1159 receive_flow_control(dc); 1160 writew(CTRL_DL, dc->reg_fcr); 1161 } 1162 if (read_iir & MDM_DL) { 1163 if (!handle_data_dl(dc, PORT_MDM, 1164 &(dc->port[PORT_MDM].toggle_dl), read_iir, 1165 MDM_DL1, MDM_DL2)) { 1166 dev_err(&dc->pdev->dev, "MDM_DL out of sync!\n"); 1167 goto exit_handler; 1168 } 1169 } 1170 if (read_iir & MDM_UL) { 1171 if (!handle_data_ul(dc, PORT_MDM, read_iir)) { 1172 dev_err(&dc->pdev->dev, "MDM_UL out of sync!\n"); 1173 goto exit_handler; 1174 } 1175 } 1176 if (read_iir & DIAG_DL) { 1177 if (!handle_data_dl(dc, PORT_DIAG, 1178 &(dc->port[PORT_DIAG].toggle_dl), read_iir, 1179 DIAG_DL1, DIAG_DL2)) { 1180 dev_err(&dc->pdev->dev, "DIAG_DL out of sync!\n"); 1181 goto exit_handler; 1182 } 1183 } 1184 if (read_iir & DIAG_UL) { 1185 dc->last_ier &= ~DIAG_UL; 1186 writew(dc->last_ier, dc->reg_ier); 1187 if (send_data(PORT_DIAG, dc)) { 1188 writew(DIAG_UL, dc->reg_fcr); 1189 dc->last_ier = dc->last_ier | DIAG_UL; 1190 writew(dc->last_ier, dc->reg_ier); 1191 } 1192 } 1193 if (read_iir & APP1_DL) { 1194 if (receive_data(PORT_APP1, dc)) 1195 writew(APP1_DL, dc->reg_fcr); 1196 } 1197 if (read_iir & APP1_UL) { 1198 dc->last_ier &= ~APP1_UL; 1199 writew(dc->last_ier, dc->reg_ier); 1200 if (send_data(PORT_APP1, dc)) { 1201 writew(APP1_UL, dc->reg_fcr); 1202 dc->last_ier = dc->last_ier | APP1_UL; 1203 writew(dc->last_ier, dc->reg_ier); 1204 } 1205 } 1206 if (read_iir & APP2_DL) { 1207 if (receive_data(PORT_APP2, dc)) 1208 writew(APP2_DL, dc->reg_fcr); 1209 } 1210 if (read_iir & APP2_UL) { 1211 dc->last_ier &= ~APP2_UL; 1212 writew(dc->last_ier, dc->reg_ier); 1213 if (send_data(PORT_APP2, dc)) { 1214 writew(APP2_UL, dc->reg_fcr); 1215 dc->last_ier = dc->last_ier | APP2_UL; 1216 writew(dc->last_ier, dc->reg_ier); 1217 } 1218 } 1219 1220 exit_handler: 1221 spin_unlock(&dc->spin_mutex); 1222 1223 for (a = 0; a < NOZOMI_MAX_PORTS; a++) 1224 if (test_and_clear_bit(a, &dc->flip)) 1225 tty_flip_buffer_push(&dc->port[a].port); 1226 1227 return IRQ_HANDLED; 1228 none: 1229 spin_unlock(&dc->spin_mutex); 1230 return IRQ_NONE; 1231 } 1232 1233 static void nozomi_get_card_type(struct nozomi *dc) 1234 { 1235 int i; 1236 u32 size = 0; 1237 1238 for (i = 0; i < 6; i++) 1239 size += pci_resource_len(dc->pdev, i); 1240 1241 /* Assume card type F32_8 if no match */ 1242 dc->card_type = size == 2048 ? F32_2 : F32_8; 1243 1244 dev_info(&dc->pdev->dev, "Card type is: %d\n", dc->card_type); 1245 } 1246 1247 static void nozomi_setup_private_data(struct nozomi *dc) 1248 { 1249 void __iomem *offset = dc->base_addr + dc->card_type / 2; 1250 unsigned int i; 1251 1252 dc->reg_fcr = (void __iomem *)(offset + R_FCR); 1253 dc->reg_iir = (void __iomem *)(offset + R_IIR); 1254 dc->reg_ier = (void __iomem *)(offset + R_IER); 1255 dc->last_ier = 0; 1256 dc->flip = 0; 1257 1258 dc->port[PORT_MDM].token_dl = MDM_DL; 1259 dc->port[PORT_DIAG].token_dl = DIAG_DL; 1260 dc->port[PORT_APP1].token_dl = APP1_DL; 1261 dc->port[PORT_APP2].token_dl = APP2_DL; 1262 1263 for (i = 0; i < MAX_PORT; i++) 1264 init_waitqueue_head(&dc->port[i].tty_wait); 1265 } 1266 1267 static ssize_t card_type_show(struct device *dev, struct device_attribute *attr, 1268 char *buf) 1269 { 1270 const struct nozomi *dc = dev_get_drvdata(dev); 1271 1272 return sprintf(buf, "%d\n", dc->card_type); 1273 } 1274 static DEVICE_ATTR_RO(card_type); 1275 1276 static ssize_t open_ttys_show(struct device *dev, struct device_attribute *attr, 1277 char *buf) 1278 { 1279 const struct nozomi *dc = dev_get_drvdata(dev); 1280 1281 return sprintf(buf, "%u\n", dc->open_ttys); 1282 } 1283 static DEVICE_ATTR_RO(open_ttys); 1284 1285 static void make_sysfs_files(struct nozomi *dc) 1286 { 1287 if (device_create_file(&dc->pdev->dev, &dev_attr_card_type)) 1288 dev_err(&dc->pdev->dev, 1289 "Could not create sysfs file for card_type\n"); 1290 if (device_create_file(&dc->pdev->dev, &dev_attr_open_ttys)) 1291 dev_err(&dc->pdev->dev, 1292 "Could not create sysfs file for open_ttys\n"); 1293 } 1294 1295 static void remove_sysfs_files(struct nozomi *dc) 1296 { 1297 device_remove_file(&dc->pdev->dev, &dev_attr_card_type); 1298 device_remove_file(&dc->pdev->dev, &dev_attr_open_ttys); 1299 } 1300 1301 /* Allocate memory for one device */ 1302 static int nozomi_card_init(struct pci_dev *pdev, 1303 const struct pci_device_id *ent) 1304 { 1305 int ret; 1306 struct nozomi *dc = NULL; 1307 int ndev_idx; 1308 int i; 1309 1310 for (ndev_idx = 0; ndev_idx < ARRAY_SIZE(ndevs); ndev_idx++) 1311 if (!ndevs[ndev_idx]) 1312 break; 1313 1314 if (ndev_idx >= ARRAY_SIZE(ndevs)) { 1315 dev_err(&pdev->dev, "no free tty range for this card left\n"); 1316 ret = -EIO; 1317 goto err; 1318 } 1319 1320 dc = kzalloc(sizeof(struct nozomi), GFP_KERNEL); 1321 if (unlikely(!dc)) { 1322 dev_err(&pdev->dev, "Could not allocate memory\n"); 1323 ret = -ENOMEM; 1324 goto err_free; 1325 } 1326 1327 dc->pdev = pdev; 1328 1329 ret = pci_enable_device(dc->pdev); 1330 if (ret) { 1331 dev_err(&pdev->dev, "Failed to enable PCI Device\n"); 1332 goto err_free; 1333 } 1334 1335 ret = pci_request_regions(dc->pdev, NOZOMI_NAME); 1336 if (ret) { 1337 dev_err(&pdev->dev, "I/O address 0x%04x already in use\n", 1338 (int) /* nozomi_private.io_addr */ 0); 1339 goto err_disable_device; 1340 } 1341 1342 /* Find out what card type it is */ 1343 nozomi_get_card_type(dc); 1344 1345 dc->base_addr = pci_iomap(dc->pdev, 0, dc->card_type); 1346 if (!dc->base_addr) { 1347 dev_err(&pdev->dev, "Unable to map card MMIO\n"); 1348 ret = -ENODEV; 1349 goto err_rel_regs; 1350 } 1351 1352 dc->send_buf = kmalloc(SEND_BUF_MAX, GFP_KERNEL); 1353 if (!dc->send_buf) { 1354 dev_err(&pdev->dev, "Could not allocate send buffer?\n"); 1355 ret = -ENOMEM; 1356 goto err_free_sbuf; 1357 } 1358 1359 for (i = PORT_MDM; i < MAX_PORT; i++) { 1360 if (kfifo_alloc(&dc->port[i].fifo_ul, FIFO_BUFFER_SIZE_UL, 1361 GFP_KERNEL)) { 1362 dev_err(&pdev->dev, 1363 "Could not allocate kfifo buffer\n"); 1364 ret = -ENOMEM; 1365 goto err_free_kfifo; 1366 } 1367 } 1368 1369 spin_lock_init(&dc->spin_mutex); 1370 1371 nozomi_setup_private_data(dc); 1372 1373 /* Disable all interrupts */ 1374 dc->last_ier = 0; 1375 writew(dc->last_ier, dc->reg_ier); 1376 1377 ret = request_irq(pdev->irq, &interrupt_handler, IRQF_SHARED, 1378 NOZOMI_NAME, dc); 1379 if (unlikely(ret)) { 1380 dev_err(&pdev->dev, "can't request irq %d\n", pdev->irq); 1381 goto err_free_kfifo; 1382 } 1383 1384 DBG1("base_addr: %p", dc->base_addr); 1385 1386 make_sysfs_files(dc); 1387 1388 dc->index_start = ndev_idx * MAX_PORT; 1389 ndevs[ndev_idx] = dc; 1390 1391 pci_set_drvdata(pdev, dc); 1392 1393 /* Enable RESET interrupt */ 1394 dc->last_ier = RESET; 1395 iowrite16(dc->last_ier, dc->reg_ier); 1396 1397 dc->state = NOZOMI_STATE_ENABLED; 1398 1399 for (i = 0; i < MAX_PORT; i++) { 1400 struct device *tty_dev; 1401 struct port *port = &dc->port[i]; 1402 port->dc = dc; 1403 tty_port_init(&port->port); 1404 port->port.ops = &noz_tty_port_ops; 1405 tty_dev = tty_port_register_device(&port->port, ntty_driver, 1406 dc->index_start + i, &pdev->dev); 1407 1408 if (IS_ERR(tty_dev)) { 1409 ret = PTR_ERR(tty_dev); 1410 dev_err(&pdev->dev, "Could not allocate tty?\n"); 1411 tty_port_destroy(&port->port); 1412 goto err_free_tty; 1413 } 1414 } 1415 1416 return 0; 1417 1418 err_free_tty: 1419 for (i = 0; i < MAX_PORT; ++i) { 1420 tty_unregister_device(ntty_driver, dc->index_start + i); 1421 tty_port_destroy(&dc->port[i].port); 1422 } 1423 err_free_kfifo: 1424 for (i = 0; i < MAX_PORT; i++) 1425 kfifo_free(&dc->port[i].fifo_ul); 1426 err_free_sbuf: 1427 kfree(dc->send_buf); 1428 iounmap(dc->base_addr); 1429 err_rel_regs: 1430 pci_release_regions(pdev); 1431 err_disable_device: 1432 pci_disable_device(pdev); 1433 err_free: 1434 kfree(dc); 1435 err: 1436 return ret; 1437 } 1438 1439 static void tty_exit(struct nozomi *dc) 1440 { 1441 unsigned int i; 1442 1443 for (i = 0; i < MAX_PORT; ++i) 1444 tty_port_tty_hangup(&dc->port[i].port, false); 1445 1446 /* Racy below - surely should wait for scheduled work to be done or 1447 complete off a hangup method ? */ 1448 while (dc->open_ttys) 1449 msleep(1); 1450 for (i = 0; i < MAX_PORT; ++i) { 1451 tty_unregister_device(ntty_driver, dc->index_start + i); 1452 tty_port_destroy(&dc->port[i].port); 1453 } 1454 } 1455 1456 /* Deallocate memory for one device */ 1457 static void nozomi_card_exit(struct pci_dev *pdev) 1458 { 1459 int i; 1460 struct ctrl_ul ctrl; 1461 struct nozomi *dc = pci_get_drvdata(pdev); 1462 1463 /* Disable all interrupts */ 1464 dc->last_ier = 0; 1465 writew(dc->last_ier, dc->reg_ier); 1466 1467 tty_exit(dc); 1468 1469 /* Send 0x0001, command card to resend the reset token. */ 1470 /* This is to get the reset when the module is reloaded. */ 1471 ctrl.port = 0x00; 1472 ctrl.reserved = 0; 1473 ctrl.RTS = 0; 1474 ctrl.DTR = 1; 1475 DBG1("sending flow control 0x%04X", *((u16 *)&ctrl)); 1476 1477 /* Setup dc->reg addresses to we can use defines here */ 1478 write_mem32(dc->port[PORT_CTRL].ul_addr[0], (u32 *)&ctrl, 2); 1479 writew(CTRL_UL, dc->reg_fcr); /* push the token to the card. */ 1480 1481 remove_sysfs_files(dc); 1482 1483 free_irq(pdev->irq, dc); 1484 1485 for (i = 0; i < MAX_PORT; i++) 1486 kfifo_free(&dc->port[i].fifo_ul); 1487 1488 kfree(dc->send_buf); 1489 1490 iounmap(dc->base_addr); 1491 1492 pci_release_regions(pdev); 1493 1494 pci_disable_device(pdev); 1495 1496 ndevs[dc->index_start / MAX_PORT] = NULL; 1497 1498 kfree(dc); 1499 } 1500 1501 static void set_rts(const struct tty_struct *tty, int rts) 1502 { 1503 struct port *port = get_port_by_tty(tty); 1504 1505 port->ctrl_ul.RTS = rts; 1506 port->update_flow_control = 1; 1507 enable_transmit_ul(PORT_CTRL, get_dc_by_tty(tty)); 1508 } 1509 1510 static void set_dtr(const struct tty_struct *tty, int dtr) 1511 { 1512 struct port *port = get_port_by_tty(tty); 1513 1514 DBG1("SETTING DTR index: %d, dtr: %d", tty->index, dtr); 1515 1516 port->ctrl_ul.DTR = dtr; 1517 port->update_flow_control = 1; 1518 enable_transmit_ul(PORT_CTRL, get_dc_by_tty(tty)); 1519 } 1520 1521 /* 1522 * ---------------------------------------------------------------------------- 1523 * TTY code 1524 * ---------------------------------------------------------------------------- 1525 */ 1526 1527 static int ntty_install(struct tty_driver *driver, struct tty_struct *tty) 1528 { 1529 struct port *port = get_port_by_tty(tty); 1530 struct nozomi *dc = get_dc_by_tty(tty); 1531 int ret; 1532 if (!port || !dc || dc->state != NOZOMI_STATE_READY) 1533 return -ENODEV; 1534 ret = tty_standard_install(driver, tty); 1535 if (ret == 0) 1536 tty->driver_data = port; 1537 return ret; 1538 } 1539 1540 static void ntty_cleanup(struct tty_struct *tty) 1541 { 1542 tty->driver_data = NULL; 1543 } 1544 1545 static int ntty_activate(struct tty_port *tport, struct tty_struct *tty) 1546 { 1547 struct port *port = container_of(tport, struct port, port); 1548 struct nozomi *dc = port->dc; 1549 unsigned long flags; 1550 1551 DBG1("open: %d", port->token_dl); 1552 spin_lock_irqsave(&dc->spin_mutex, flags); 1553 dc->last_ier = dc->last_ier | port->token_dl; 1554 writew(dc->last_ier, dc->reg_ier); 1555 dc->open_ttys++; 1556 spin_unlock_irqrestore(&dc->spin_mutex, flags); 1557 printk("noz: activated %d: %p\n", tty->index, tport); 1558 return 0; 1559 } 1560 1561 static int ntty_open(struct tty_struct *tty, struct file *filp) 1562 { 1563 struct port *port = tty->driver_data; 1564 return tty_port_open(&port->port, tty, filp); 1565 } 1566 1567 static void ntty_shutdown(struct tty_port *tport) 1568 { 1569 struct port *port = container_of(tport, struct port, port); 1570 struct nozomi *dc = port->dc; 1571 unsigned long flags; 1572 1573 DBG1("close: %d", port->token_dl); 1574 spin_lock_irqsave(&dc->spin_mutex, flags); 1575 dc->last_ier &= ~(port->token_dl); 1576 writew(dc->last_ier, dc->reg_ier); 1577 dc->open_ttys--; 1578 spin_unlock_irqrestore(&dc->spin_mutex, flags); 1579 printk("noz: shutdown %p\n", tport); 1580 } 1581 1582 static void ntty_close(struct tty_struct *tty, struct file *filp) 1583 { 1584 struct port *port = tty->driver_data; 1585 if (port) 1586 tty_port_close(&port->port, tty, filp); 1587 } 1588 1589 static void ntty_hangup(struct tty_struct *tty) 1590 { 1591 struct port *port = tty->driver_data; 1592 tty_port_hangup(&port->port); 1593 } 1594 1595 /* 1596 * called when the userspace process writes to the tty (/dev/noz*). 1597 * Data is inserted into a fifo, which is then read and transferred to the modem. 1598 */ 1599 static int ntty_write(struct tty_struct *tty, const unsigned char *buffer, 1600 int count) 1601 { 1602 int rval = -EINVAL; 1603 struct nozomi *dc = get_dc_by_tty(tty); 1604 struct port *port = tty->driver_data; 1605 unsigned long flags; 1606 1607 if (!dc || !port) 1608 return -ENODEV; 1609 1610 rval = kfifo_in(&port->fifo_ul, (unsigned char *)buffer, count); 1611 1612 spin_lock_irqsave(&dc->spin_mutex, flags); 1613 /* CTS is only valid on the modem channel */ 1614 if (port == &(dc->port[PORT_MDM])) { 1615 if (port->ctrl_dl.CTS) { 1616 DBG4("Enable interrupt"); 1617 enable_transmit_ul(tty->index % MAX_PORT, dc); 1618 } else { 1619 dev_err(&dc->pdev->dev, 1620 "CTS not active on modem port?\n"); 1621 } 1622 } else { 1623 enable_transmit_ul(tty->index % MAX_PORT, dc); 1624 } 1625 spin_unlock_irqrestore(&dc->spin_mutex, flags); 1626 1627 return rval; 1628 } 1629 1630 /* 1631 * Calculate how much is left in device 1632 * This method is called by the upper tty layer. 1633 * #according to sources N_TTY.c it expects a value >= 0 and 1634 * does not check for negative values. 1635 * 1636 * If the port is unplugged report lots of room and let the bits 1637 * dribble away so we don't block anything. 1638 */ 1639 static int ntty_write_room(struct tty_struct *tty) 1640 { 1641 struct port *port = tty->driver_data; 1642 int room = 4096; 1643 const struct nozomi *dc = get_dc_by_tty(tty); 1644 1645 if (dc) 1646 room = kfifo_avail(&port->fifo_ul); 1647 1648 return room; 1649 } 1650 1651 /* Gets io control parameters */ 1652 static int ntty_tiocmget(struct tty_struct *tty) 1653 { 1654 const struct port *port = tty->driver_data; 1655 const struct ctrl_dl *ctrl_dl = &port->ctrl_dl; 1656 const struct ctrl_ul *ctrl_ul = &port->ctrl_ul; 1657 1658 /* Note: these could change under us but it is not clear this 1659 matters if so */ 1660 return (ctrl_ul->RTS ? TIOCM_RTS : 0) 1661 | (ctrl_ul->DTR ? TIOCM_DTR : 0) 1662 | (ctrl_dl->DCD ? TIOCM_CAR : 0) 1663 | (ctrl_dl->RI ? TIOCM_RNG : 0) 1664 | (ctrl_dl->DSR ? TIOCM_DSR : 0) 1665 | (ctrl_dl->CTS ? TIOCM_CTS : 0); 1666 } 1667 1668 /* Sets io controls parameters */ 1669 static int ntty_tiocmset(struct tty_struct *tty, 1670 unsigned int set, unsigned int clear) 1671 { 1672 struct nozomi *dc = get_dc_by_tty(tty); 1673 unsigned long flags; 1674 1675 spin_lock_irqsave(&dc->spin_mutex, flags); 1676 if (set & TIOCM_RTS) 1677 set_rts(tty, 1); 1678 else if (clear & TIOCM_RTS) 1679 set_rts(tty, 0); 1680 1681 if (set & TIOCM_DTR) 1682 set_dtr(tty, 1); 1683 else if (clear & TIOCM_DTR) 1684 set_dtr(tty, 0); 1685 spin_unlock_irqrestore(&dc->spin_mutex, flags); 1686 1687 return 0; 1688 } 1689 1690 static int ntty_cflags_changed(struct port *port, unsigned long flags, 1691 struct async_icount *cprev) 1692 { 1693 const struct async_icount cnow = port->tty_icount; 1694 int ret; 1695 1696 ret = ((flags & TIOCM_RNG) && (cnow.rng != cprev->rng)) 1697 || ((flags & TIOCM_DSR) && (cnow.dsr != cprev->dsr)) 1698 || ((flags & TIOCM_CD) && (cnow.dcd != cprev->dcd)) 1699 || ((flags & TIOCM_CTS) && (cnow.cts != cprev->cts)); 1700 1701 *cprev = cnow; 1702 1703 return ret; 1704 } 1705 1706 static int ntty_tiocgicount(struct tty_struct *tty, 1707 struct serial_icounter_struct *icount) 1708 { 1709 struct port *port = tty->driver_data; 1710 const struct async_icount cnow = port->tty_icount; 1711 1712 icount->cts = cnow.cts; 1713 icount->dsr = cnow.dsr; 1714 icount->rng = cnow.rng; 1715 icount->dcd = cnow.dcd; 1716 icount->rx = cnow.rx; 1717 icount->tx = cnow.tx; 1718 icount->frame = cnow.frame; 1719 icount->overrun = cnow.overrun; 1720 icount->parity = cnow.parity; 1721 icount->brk = cnow.brk; 1722 icount->buf_overrun = cnow.buf_overrun; 1723 return 0; 1724 } 1725 1726 static int ntty_ioctl(struct tty_struct *tty, 1727 unsigned int cmd, unsigned long arg) 1728 { 1729 struct port *port = tty->driver_data; 1730 int rval = -ENOIOCTLCMD; 1731 1732 switch (cmd) { 1733 case TIOCMIWAIT: { 1734 struct async_icount cprev = port->tty_icount; 1735 1736 rval = wait_event_interruptible(port->tty_wait, 1737 ntty_cflags_changed(port, arg, &cprev)); 1738 break; 1739 } 1740 default: 1741 DBG1("ERR: 0x%08X, %d", cmd, cmd); 1742 break; 1743 } 1744 1745 return rval; 1746 } 1747 1748 /* 1749 * Called by the upper tty layer when tty buffers are ready 1750 * to receive data again after a call to throttle. 1751 */ 1752 static void ntty_unthrottle(struct tty_struct *tty) 1753 { 1754 struct nozomi *dc = get_dc_by_tty(tty); 1755 unsigned long flags; 1756 1757 spin_lock_irqsave(&dc->spin_mutex, flags); 1758 enable_transmit_dl(tty->index % MAX_PORT, dc); 1759 set_rts(tty, 1); 1760 1761 spin_unlock_irqrestore(&dc->spin_mutex, flags); 1762 } 1763 1764 /* 1765 * Called by the upper tty layer when the tty buffers are almost full. 1766 * The driver should stop send more data. 1767 */ 1768 static void ntty_throttle(struct tty_struct *tty) 1769 { 1770 struct nozomi *dc = get_dc_by_tty(tty); 1771 unsigned long flags; 1772 1773 spin_lock_irqsave(&dc->spin_mutex, flags); 1774 set_rts(tty, 0); 1775 spin_unlock_irqrestore(&dc->spin_mutex, flags); 1776 } 1777 1778 /* Returns number of chars in buffer, called by tty layer */ 1779 static s32 ntty_chars_in_buffer(struct tty_struct *tty) 1780 { 1781 struct port *port = tty->driver_data; 1782 struct nozomi *dc = get_dc_by_tty(tty); 1783 s32 rval = 0; 1784 1785 if (unlikely(!dc || !port)) { 1786 goto exit_in_buffer; 1787 } 1788 1789 rval = kfifo_len(&port->fifo_ul); 1790 1791 exit_in_buffer: 1792 return rval; 1793 } 1794 1795 static const struct tty_port_operations noz_tty_port_ops = { 1796 .activate = ntty_activate, 1797 .shutdown = ntty_shutdown, 1798 }; 1799 1800 static const struct tty_operations tty_ops = { 1801 .ioctl = ntty_ioctl, 1802 .open = ntty_open, 1803 .close = ntty_close, 1804 .hangup = ntty_hangup, 1805 .write = ntty_write, 1806 .write_room = ntty_write_room, 1807 .unthrottle = ntty_unthrottle, 1808 .throttle = ntty_throttle, 1809 .chars_in_buffer = ntty_chars_in_buffer, 1810 .tiocmget = ntty_tiocmget, 1811 .tiocmset = ntty_tiocmset, 1812 .get_icount = ntty_tiocgicount, 1813 .install = ntty_install, 1814 .cleanup = ntty_cleanup, 1815 }; 1816 1817 /* Module initialization */ 1818 static struct pci_driver nozomi_driver = { 1819 .name = NOZOMI_NAME, 1820 .id_table = nozomi_pci_tbl, 1821 .probe = nozomi_card_init, 1822 .remove = nozomi_card_exit, 1823 }; 1824 1825 static __init int nozomi_init(void) 1826 { 1827 int ret; 1828 1829 ntty_driver = alloc_tty_driver(NTTY_TTY_MAXMINORS); 1830 if (!ntty_driver) 1831 return -ENOMEM; 1832 1833 ntty_driver->driver_name = NOZOMI_NAME_TTY; 1834 ntty_driver->name = "noz"; 1835 ntty_driver->major = 0; 1836 ntty_driver->type = TTY_DRIVER_TYPE_SERIAL; 1837 ntty_driver->subtype = SERIAL_TYPE_NORMAL; 1838 ntty_driver->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_DYNAMIC_DEV; 1839 ntty_driver->init_termios = tty_std_termios; 1840 ntty_driver->init_termios.c_cflag = B115200 | CS8 | CREAD | \ 1841 HUPCL | CLOCAL; 1842 ntty_driver->init_termios.c_ispeed = 115200; 1843 ntty_driver->init_termios.c_ospeed = 115200; 1844 tty_set_operations(ntty_driver, &tty_ops); 1845 1846 ret = tty_register_driver(ntty_driver); 1847 if (ret) { 1848 printk(KERN_ERR "Nozomi: failed to register ntty driver\n"); 1849 goto free_tty; 1850 } 1851 1852 ret = pci_register_driver(&nozomi_driver); 1853 if (ret) { 1854 printk(KERN_ERR "Nozomi: can't register pci driver\n"); 1855 goto unr_tty; 1856 } 1857 1858 return 0; 1859 unr_tty: 1860 tty_unregister_driver(ntty_driver); 1861 free_tty: 1862 put_tty_driver(ntty_driver); 1863 return ret; 1864 } 1865 1866 static __exit void nozomi_exit(void) 1867 { 1868 pci_unregister_driver(&nozomi_driver); 1869 tty_unregister_driver(ntty_driver); 1870 put_tty_driver(ntty_driver); 1871 } 1872 1873 module_init(nozomi_init); 1874 module_exit(nozomi_exit); 1875 1876 MODULE_LICENSE("Dual BSD/GPL"); 1877 MODULE_DESCRIPTION("Nozomi driver"); 1878