1 /* 2 * ms_block.c - Sony MemoryStick (legacy) storage support 3 4 * Copyright (C) 2013 Maxim Levitsky <maximlevitsky@gmail.com> 5 * 6 * This program is free software; you can redistribute it and/or modify 7 * it under the terms of the GNU General Public License version 2 as 8 * published by the Free Software Foundation. 9 * 10 * Minor portions of the driver were copied from mspro_block.c which is 11 * Copyright (C) 2007 Alex Dubov <oakad@yahoo.com> 12 * 13 */ 14 #define DRIVER_NAME "ms_block" 15 #define pr_fmt(fmt) DRIVER_NAME ": " fmt 16 17 #include <linux/module.h> 18 #include <linux/blkdev.h> 19 #include <linux/memstick.h> 20 #include <linux/idr.h> 21 #include <linux/hdreg.h> 22 #include <linux/delay.h> 23 #include <linux/slab.h> 24 #include <linux/random.h> 25 #include <linux/bitmap.h> 26 #include <linux/scatterlist.h> 27 #include <linux/jiffies.h> 28 #include <linux/workqueue.h> 29 #include <linux/mutex.h> 30 #include "ms_block.h" 31 32 static int debug; 33 static int cache_flush_timeout = 1000; 34 static bool verify_writes; 35 36 /* 37 * Copies section of 'sg_from' starting from offset 'offset' and with length 38 * 'len' To another scatterlist of to_nents enties 39 */ 40 static size_t msb_sg_copy(struct scatterlist *sg_from, 41 struct scatterlist *sg_to, int to_nents, size_t offset, size_t len) 42 { 43 size_t copied = 0; 44 45 while (offset > 0) { 46 if (offset >= sg_from->length) { 47 if (sg_is_last(sg_from)) 48 return 0; 49 50 offset -= sg_from->length; 51 sg_from = sg_next(sg_from); 52 continue; 53 } 54 55 copied = min(len, sg_from->length - offset); 56 sg_set_page(sg_to, sg_page(sg_from), 57 copied, sg_from->offset + offset); 58 59 len -= copied; 60 offset = 0; 61 62 if (sg_is_last(sg_from) || !len) 63 goto out; 64 65 sg_to = sg_next(sg_to); 66 to_nents--; 67 sg_from = sg_next(sg_from); 68 } 69 70 while (len > sg_from->length && to_nents--) { 71 len -= sg_from->length; 72 copied += sg_from->length; 73 74 sg_set_page(sg_to, sg_page(sg_from), 75 sg_from->length, sg_from->offset); 76 77 if (sg_is_last(sg_from) || !len) 78 goto out; 79 80 sg_from = sg_next(sg_from); 81 sg_to = sg_next(sg_to); 82 } 83 84 if (len && to_nents) { 85 sg_set_page(sg_to, sg_page(sg_from), len, sg_from->offset); 86 copied += len; 87 } 88 out: 89 sg_mark_end(sg_to); 90 return copied; 91 } 92 93 /* 94 * Compares section of 'sg' starting from offset 'offset' and with length 'len' 95 * to linear buffer of length 'len' at address 'buffer' 96 * Returns 0 if equal and -1 otherwice 97 */ 98 static int msb_sg_compare_to_buffer(struct scatterlist *sg, 99 size_t offset, u8 *buffer, size_t len) 100 { 101 int retval = 0, cmplen; 102 struct sg_mapping_iter miter; 103 104 sg_miter_start(&miter, sg, sg_nents(sg), 105 SG_MITER_ATOMIC | SG_MITER_FROM_SG); 106 107 while (sg_miter_next(&miter) && len > 0) { 108 if (offset >= miter.length) { 109 offset -= miter.length; 110 continue; 111 } 112 113 cmplen = min(miter.length - offset, len); 114 retval = memcmp(miter.addr + offset, buffer, cmplen) ? -1 : 0; 115 if (retval) 116 break; 117 118 buffer += cmplen; 119 len -= cmplen; 120 offset = 0; 121 } 122 123 if (!retval && len) 124 retval = -1; 125 126 sg_miter_stop(&miter); 127 return retval; 128 } 129 130 131 /* Get zone at which block with logical address 'lba' lives 132 * Flash is broken into zones. 133 * Each zone consists of 512 eraseblocks, out of which in first 134 * zone 494 are used and 496 are for all following zones. 135 * Therefore zone #0 hosts blocks 0-493, zone #1 blocks 494-988, etc... 136 */ 137 static int msb_get_zone_from_lba(int lba) 138 { 139 if (lba < 494) 140 return 0; 141 return ((lba - 494) / 496) + 1; 142 } 143 144 /* Get zone of physical block. Trivial */ 145 static int msb_get_zone_from_pba(int pba) 146 { 147 return pba / MS_BLOCKS_IN_ZONE; 148 } 149 150 /* Debug test to validate free block counts */ 151 static int msb_validate_used_block_bitmap(struct msb_data *msb) 152 { 153 int total_free_blocks = 0; 154 int i; 155 156 if (!debug) 157 return 0; 158 159 for (i = 0; i < msb->zone_count; i++) 160 total_free_blocks += msb->free_block_count[i]; 161 162 if (msb->block_count - bitmap_weight(msb->used_blocks_bitmap, 163 msb->block_count) == total_free_blocks) 164 return 0; 165 166 pr_err("BUG: free block counts don't match the bitmap"); 167 msb->read_only = true; 168 return -EINVAL; 169 } 170 171 /* Mark physical block as used */ 172 static void msb_mark_block_used(struct msb_data *msb, int pba) 173 { 174 int zone = msb_get_zone_from_pba(pba); 175 176 if (test_bit(pba, msb->used_blocks_bitmap)) { 177 pr_err( 178 "BUG: attempt to mark already used pba %d as used", pba); 179 msb->read_only = true; 180 return; 181 } 182 183 if (msb_validate_used_block_bitmap(msb)) 184 return; 185 186 /* No races because all IO is single threaded */ 187 __set_bit(pba, msb->used_blocks_bitmap); 188 msb->free_block_count[zone]--; 189 } 190 191 /* Mark physical block as free */ 192 static void msb_mark_block_unused(struct msb_data *msb, int pba) 193 { 194 int zone = msb_get_zone_from_pba(pba); 195 196 if (!test_bit(pba, msb->used_blocks_bitmap)) { 197 pr_err("BUG: attempt to mark already unused pba %d as unused" , pba); 198 msb->read_only = true; 199 return; 200 } 201 202 if (msb_validate_used_block_bitmap(msb)) 203 return; 204 205 /* No races because all IO is single threaded */ 206 __clear_bit(pba, msb->used_blocks_bitmap); 207 msb->free_block_count[zone]++; 208 } 209 210 /* Invalidate current register window */ 211 static void msb_invalidate_reg_window(struct msb_data *msb) 212 { 213 msb->reg_addr.w_offset = offsetof(struct ms_register, id); 214 msb->reg_addr.w_length = sizeof(struct ms_id_register); 215 msb->reg_addr.r_offset = offsetof(struct ms_register, id); 216 msb->reg_addr.r_length = sizeof(struct ms_id_register); 217 msb->addr_valid = false; 218 } 219 220 /* Start a state machine */ 221 static int msb_run_state_machine(struct msb_data *msb, int (*state_func) 222 (struct memstick_dev *card, struct memstick_request **req)) 223 { 224 struct memstick_dev *card = msb->card; 225 226 WARN_ON(msb->state != -1); 227 msb->int_polling = false; 228 msb->state = 0; 229 msb->exit_error = 0; 230 231 memset(&card->current_mrq, 0, sizeof(card->current_mrq)); 232 233 card->next_request = state_func; 234 memstick_new_req(card->host); 235 wait_for_completion(&card->mrq_complete); 236 237 WARN_ON(msb->state != -1); 238 return msb->exit_error; 239 } 240 241 /* State machines call that to exit */ 242 static int msb_exit_state_machine(struct msb_data *msb, int error) 243 { 244 WARN_ON(msb->state == -1); 245 246 msb->state = -1; 247 msb->exit_error = error; 248 msb->card->next_request = h_msb_default_bad; 249 250 /* Invalidate reg window on errors */ 251 if (error) 252 msb_invalidate_reg_window(msb); 253 254 complete(&msb->card->mrq_complete); 255 return -ENXIO; 256 } 257 258 /* read INT register */ 259 static int msb_read_int_reg(struct msb_data *msb, long timeout) 260 { 261 struct memstick_request *mrq = &msb->card->current_mrq; 262 263 WARN_ON(msb->state == -1); 264 265 if (!msb->int_polling) { 266 msb->int_timeout = jiffies + 267 msecs_to_jiffies(timeout == -1 ? 500 : timeout); 268 msb->int_polling = true; 269 } else if (time_after(jiffies, msb->int_timeout)) { 270 mrq->data[0] = MEMSTICK_INT_CMDNAK; 271 return 0; 272 } 273 274 if ((msb->caps & MEMSTICK_CAP_AUTO_GET_INT) && 275 mrq->need_card_int && !mrq->error) { 276 mrq->data[0] = mrq->int_reg; 277 mrq->need_card_int = false; 278 return 0; 279 } else { 280 memstick_init_req(mrq, MS_TPC_GET_INT, NULL, 1); 281 return 1; 282 } 283 } 284 285 /* Read a register */ 286 static int msb_read_regs(struct msb_data *msb, int offset, int len) 287 { 288 struct memstick_request *req = &msb->card->current_mrq; 289 290 if (msb->reg_addr.r_offset != offset || 291 msb->reg_addr.r_length != len || !msb->addr_valid) { 292 293 msb->reg_addr.r_offset = offset; 294 msb->reg_addr.r_length = len; 295 msb->addr_valid = true; 296 297 memstick_init_req(req, MS_TPC_SET_RW_REG_ADRS, 298 &msb->reg_addr, sizeof(msb->reg_addr)); 299 return 0; 300 } 301 302 memstick_init_req(req, MS_TPC_READ_REG, NULL, len); 303 return 1; 304 } 305 306 /* Write a card register */ 307 static int msb_write_regs(struct msb_data *msb, int offset, int len, void *buf) 308 { 309 struct memstick_request *req = &msb->card->current_mrq; 310 311 if (msb->reg_addr.w_offset != offset || 312 msb->reg_addr.w_length != len || !msb->addr_valid) { 313 314 msb->reg_addr.w_offset = offset; 315 msb->reg_addr.w_length = len; 316 msb->addr_valid = true; 317 318 memstick_init_req(req, MS_TPC_SET_RW_REG_ADRS, 319 &msb->reg_addr, sizeof(msb->reg_addr)); 320 return 0; 321 } 322 323 memstick_init_req(req, MS_TPC_WRITE_REG, buf, len); 324 return 1; 325 } 326 327 /* Handler for absence of IO */ 328 static int h_msb_default_bad(struct memstick_dev *card, 329 struct memstick_request **mrq) 330 { 331 return -ENXIO; 332 } 333 334 /* 335 * This function is a handler for reads of one page from device. 336 * Writes output to msb->current_sg, takes sector address from msb->reg.param 337 * Can also be used to read extra data only. Set params accordintly. 338 */ 339 static int h_msb_read_page(struct memstick_dev *card, 340 struct memstick_request **out_mrq) 341 { 342 struct msb_data *msb = memstick_get_drvdata(card); 343 struct memstick_request *mrq = *out_mrq = &card->current_mrq; 344 struct scatterlist sg[2]; 345 u8 command, intreg; 346 347 if (mrq->error) { 348 dbg("read_page, unknown error"); 349 return msb_exit_state_machine(msb, mrq->error); 350 } 351 again: 352 switch (msb->state) { 353 case MSB_RP_SEND_BLOCK_ADDRESS: 354 /* msb_write_regs sometimes "fails" because it needs to update 355 the reg window, and thus it returns request for that. 356 Then we stay in this state and retry */ 357 if (!msb_write_regs(msb, 358 offsetof(struct ms_register, param), 359 sizeof(struct ms_param_register), 360 (unsigned char *)&msb->regs.param)) 361 return 0; 362 363 msb->state = MSB_RP_SEND_READ_COMMAND; 364 return 0; 365 366 case MSB_RP_SEND_READ_COMMAND: 367 command = MS_CMD_BLOCK_READ; 368 memstick_init_req(mrq, MS_TPC_SET_CMD, &command, 1); 369 msb->state = MSB_RP_SEND_INT_REQ; 370 return 0; 371 372 case MSB_RP_SEND_INT_REQ: 373 msb->state = MSB_RP_RECEIVE_INT_REQ_RESULT; 374 /* If dont actually need to send the int read request (only in 375 serial mode), then just fall through */ 376 if (msb_read_int_reg(msb, -1)) 377 return 0; 378 /* fallthrough */ 379 380 case MSB_RP_RECEIVE_INT_REQ_RESULT: 381 intreg = mrq->data[0]; 382 msb->regs.status.interrupt = intreg; 383 384 if (intreg & MEMSTICK_INT_CMDNAK) 385 return msb_exit_state_machine(msb, -EIO); 386 387 if (!(intreg & MEMSTICK_INT_CED)) { 388 msb->state = MSB_RP_SEND_INT_REQ; 389 goto again; 390 } 391 392 msb->int_polling = false; 393 msb->state = (intreg & MEMSTICK_INT_ERR) ? 394 MSB_RP_SEND_READ_STATUS_REG : MSB_RP_SEND_OOB_READ; 395 goto again; 396 397 case MSB_RP_SEND_READ_STATUS_REG: 398 /* read the status register to understand source of the INT_ERR */ 399 if (!msb_read_regs(msb, 400 offsetof(struct ms_register, status), 401 sizeof(struct ms_status_register))) 402 return 0; 403 404 msb->state = MSB_RP_RECEIVE_STATUS_REG; 405 return 0; 406 407 case MSB_RP_RECEIVE_STATUS_REG: 408 msb->regs.status = *(struct ms_status_register *)mrq->data; 409 msb->state = MSB_RP_SEND_OOB_READ; 410 /* fallthrough */ 411 412 case MSB_RP_SEND_OOB_READ: 413 if (!msb_read_regs(msb, 414 offsetof(struct ms_register, extra_data), 415 sizeof(struct ms_extra_data_register))) 416 return 0; 417 418 msb->state = MSB_RP_RECEIVE_OOB_READ; 419 return 0; 420 421 case MSB_RP_RECEIVE_OOB_READ: 422 msb->regs.extra_data = 423 *(struct ms_extra_data_register *) mrq->data; 424 msb->state = MSB_RP_SEND_READ_DATA; 425 /* fallthrough */ 426 427 case MSB_RP_SEND_READ_DATA: 428 /* Skip that state if we only read the oob */ 429 if (msb->regs.param.cp == MEMSTICK_CP_EXTRA) { 430 msb->state = MSB_RP_RECEIVE_READ_DATA; 431 goto again; 432 } 433 434 sg_init_table(sg, ARRAY_SIZE(sg)); 435 msb_sg_copy(msb->current_sg, sg, ARRAY_SIZE(sg), 436 msb->current_sg_offset, 437 msb->page_size); 438 439 memstick_init_req_sg(mrq, MS_TPC_READ_LONG_DATA, sg); 440 msb->state = MSB_RP_RECEIVE_READ_DATA; 441 return 0; 442 443 case MSB_RP_RECEIVE_READ_DATA: 444 if (!(msb->regs.status.interrupt & MEMSTICK_INT_ERR)) { 445 msb->current_sg_offset += msb->page_size; 446 return msb_exit_state_machine(msb, 0); 447 } 448 449 if (msb->regs.status.status1 & MEMSTICK_UNCORR_ERROR) { 450 dbg("read_page: uncorrectable error"); 451 return msb_exit_state_machine(msb, -EBADMSG); 452 } 453 454 if (msb->regs.status.status1 & MEMSTICK_CORR_ERROR) { 455 dbg("read_page: correctable error"); 456 msb->current_sg_offset += msb->page_size; 457 return msb_exit_state_machine(msb, -EUCLEAN); 458 } else { 459 dbg("read_page: INT error, but no status error bits"); 460 return msb_exit_state_machine(msb, -EIO); 461 } 462 } 463 464 BUG(); 465 } 466 467 /* 468 * Handler of writes of exactly one block. 469 * Takes address from msb->regs.param. 470 * Writes same extra data to blocks, also taken 471 * from msb->regs.extra 472 * Returns -EBADMSG if write fails due to uncorrectable error, or -EIO if 473 * device refuses to take the command or something else 474 */ 475 static int h_msb_write_block(struct memstick_dev *card, 476 struct memstick_request **out_mrq) 477 { 478 struct msb_data *msb = memstick_get_drvdata(card); 479 struct memstick_request *mrq = *out_mrq = &card->current_mrq; 480 struct scatterlist sg[2]; 481 u8 intreg, command; 482 483 if (mrq->error) 484 return msb_exit_state_machine(msb, mrq->error); 485 486 again: 487 switch (msb->state) { 488 489 /* HACK: Jmicon handling of TPCs between 8 and 490 * sizeof(memstick_request.data) is broken due to hardware 491 * bug in PIO mode that is used for these TPCs 492 * Therefore split the write 493 */ 494 495 case MSB_WB_SEND_WRITE_PARAMS: 496 if (!msb_write_regs(msb, 497 offsetof(struct ms_register, param), 498 sizeof(struct ms_param_register), 499 &msb->regs.param)) 500 return 0; 501 502 msb->state = MSB_WB_SEND_WRITE_OOB; 503 return 0; 504 505 case MSB_WB_SEND_WRITE_OOB: 506 if (!msb_write_regs(msb, 507 offsetof(struct ms_register, extra_data), 508 sizeof(struct ms_extra_data_register), 509 &msb->regs.extra_data)) 510 return 0; 511 msb->state = MSB_WB_SEND_WRITE_COMMAND; 512 return 0; 513 514 515 case MSB_WB_SEND_WRITE_COMMAND: 516 command = MS_CMD_BLOCK_WRITE; 517 memstick_init_req(mrq, MS_TPC_SET_CMD, &command, 1); 518 msb->state = MSB_WB_SEND_INT_REQ; 519 return 0; 520 521 case MSB_WB_SEND_INT_REQ: 522 msb->state = MSB_WB_RECEIVE_INT_REQ; 523 if (msb_read_int_reg(msb, -1)) 524 return 0; 525 /* fallthrough */ 526 527 case MSB_WB_RECEIVE_INT_REQ: 528 intreg = mrq->data[0]; 529 msb->regs.status.interrupt = intreg; 530 531 /* errors mean out of here, and fast... */ 532 if (intreg & (MEMSTICK_INT_CMDNAK)) 533 return msb_exit_state_machine(msb, -EIO); 534 535 if (intreg & MEMSTICK_INT_ERR) 536 return msb_exit_state_machine(msb, -EBADMSG); 537 538 539 /* for last page we need to poll CED */ 540 if (msb->current_page == msb->pages_in_block) { 541 if (intreg & MEMSTICK_INT_CED) 542 return msb_exit_state_machine(msb, 0); 543 msb->state = MSB_WB_SEND_INT_REQ; 544 goto again; 545 546 } 547 548 /* for non-last page we need BREQ before writing next chunk */ 549 if (!(intreg & MEMSTICK_INT_BREQ)) { 550 msb->state = MSB_WB_SEND_INT_REQ; 551 goto again; 552 } 553 554 msb->int_polling = false; 555 msb->state = MSB_WB_SEND_WRITE_DATA; 556 /* fallthrough */ 557 558 case MSB_WB_SEND_WRITE_DATA: 559 sg_init_table(sg, ARRAY_SIZE(sg)); 560 561 if (msb_sg_copy(msb->current_sg, sg, ARRAY_SIZE(sg), 562 msb->current_sg_offset, 563 msb->page_size) < msb->page_size) 564 return msb_exit_state_machine(msb, -EIO); 565 566 memstick_init_req_sg(mrq, MS_TPC_WRITE_LONG_DATA, sg); 567 mrq->need_card_int = 1; 568 msb->state = MSB_WB_RECEIVE_WRITE_CONFIRMATION; 569 return 0; 570 571 case MSB_WB_RECEIVE_WRITE_CONFIRMATION: 572 msb->current_page++; 573 msb->current_sg_offset += msb->page_size; 574 msb->state = MSB_WB_SEND_INT_REQ; 575 goto again; 576 default: 577 BUG(); 578 } 579 580 return 0; 581 } 582 583 /* 584 * This function is used to send simple IO requests to device that consist 585 * of register write + command 586 */ 587 static int h_msb_send_command(struct memstick_dev *card, 588 struct memstick_request **out_mrq) 589 { 590 struct msb_data *msb = memstick_get_drvdata(card); 591 struct memstick_request *mrq = *out_mrq = &card->current_mrq; 592 u8 intreg; 593 594 if (mrq->error) { 595 dbg("send_command: unknown error"); 596 return msb_exit_state_machine(msb, mrq->error); 597 } 598 again: 599 switch (msb->state) { 600 601 /* HACK: see h_msb_write_block */ 602 case MSB_SC_SEND_WRITE_PARAMS: /* write param register*/ 603 if (!msb_write_regs(msb, 604 offsetof(struct ms_register, param), 605 sizeof(struct ms_param_register), 606 &msb->regs.param)) 607 return 0; 608 msb->state = MSB_SC_SEND_WRITE_OOB; 609 return 0; 610 611 case MSB_SC_SEND_WRITE_OOB: 612 if (!msb->command_need_oob) { 613 msb->state = MSB_SC_SEND_COMMAND; 614 goto again; 615 } 616 617 if (!msb_write_regs(msb, 618 offsetof(struct ms_register, extra_data), 619 sizeof(struct ms_extra_data_register), 620 &msb->regs.extra_data)) 621 return 0; 622 623 msb->state = MSB_SC_SEND_COMMAND; 624 return 0; 625 626 case MSB_SC_SEND_COMMAND: 627 memstick_init_req(mrq, MS_TPC_SET_CMD, &msb->command_value, 1); 628 msb->state = MSB_SC_SEND_INT_REQ; 629 return 0; 630 631 case MSB_SC_SEND_INT_REQ: 632 msb->state = MSB_SC_RECEIVE_INT_REQ; 633 if (msb_read_int_reg(msb, -1)) 634 return 0; 635 /* fallthrough */ 636 637 case MSB_SC_RECEIVE_INT_REQ: 638 intreg = mrq->data[0]; 639 640 if (intreg & MEMSTICK_INT_CMDNAK) 641 return msb_exit_state_machine(msb, -EIO); 642 if (intreg & MEMSTICK_INT_ERR) 643 return msb_exit_state_machine(msb, -EBADMSG); 644 645 if (!(intreg & MEMSTICK_INT_CED)) { 646 msb->state = MSB_SC_SEND_INT_REQ; 647 goto again; 648 } 649 650 return msb_exit_state_machine(msb, 0); 651 } 652 653 BUG(); 654 } 655 656 /* Small handler for card reset */ 657 static int h_msb_reset(struct memstick_dev *card, 658 struct memstick_request **out_mrq) 659 { 660 u8 command = MS_CMD_RESET; 661 struct msb_data *msb = memstick_get_drvdata(card); 662 struct memstick_request *mrq = *out_mrq = &card->current_mrq; 663 664 if (mrq->error) 665 return msb_exit_state_machine(msb, mrq->error); 666 667 switch (msb->state) { 668 case MSB_RS_SEND: 669 memstick_init_req(mrq, MS_TPC_SET_CMD, &command, 1); 670 mrq->need_card_int = 0; 671 msb->state = MSB_RS_CONFIRM; 672 return 0; 673 case MSB_RS_CONFIRM: 674 return msb_exit_state_machine(msb, 0); 675 } 676 BUG(); 677 } 678 679 /* This handler is used to do serial->parallel switch */ 680 static int h_msb_parallel_switch(struct memstick_dev *card, 681 struct memstick_request **out_mrq) 682 { 683 struct msb_data *msb = memstick_get_drvdata(card); 684 struct memstick_request *mrq = *out_mrq = &card->current_mrq; 685 struct memstick_host *host = card->host; 686 687 if (mrq->error) { 688 dbg("parallel_switch: error"); 689 msb->regs.param.system &= ~MEMSTICK_SYS_PAM; 690 return msb_exit_state_machine(msb, mrq->error); 691 } 692 693 switch (msb->state) { 694 case MSB_PS_SEND_SWITCH_COMMAND: 695 /* Set the parallel interface on memstick side */ 696 msb->regs.param.system |= MEMSTICK_SYS_PAM; 697 698 if (!msb_write_regs(msb, 699 offsetof(struct ms_register, param), 700 1, 701 (unsigned char *)&msb->regs.param)) 702 return 0; 703 704 msb->state = MSB_PS_SWICH_HOST; 705 return 0; 706 707 case MSB_PS_SWICH_HOST: 708 /* Set parallel interface on our side + send a dummy request 709 to see if card responds */ 710 host->set_param(host, MEMSTICK_INTERFACE, MEMSTICK_PAR4); 711 memstick_init_req(mrq, MS_TPC_GET_INT, NULL, 1); 712 msb->state = MSB_PS_CONFIRM; 713 return 0; 714 715 case MSB_PS_CONFIRM: 716 return msb_exit_state_machine(msb, 0); 717 } 718 719 BUG(); 720 } 721 722 static int msb_switch_to_parallel(struct msb_data *msb); 723 724 /* Reset the card, to guard against hw errors beeing treated as bad blocks */ 725 static int msb_reset(struct msb_data *msb, bool full) 726 { 727 728 bool was_parallel = msb->regs.param.system & MEMSTICK_SYS_PAM; 729 struct memstick_dev *card = msb->card; 730 struct memstick_host *host = card->host; 731 int error; 732 733 /* Reset the card */ 734 msb->regs.param.system = MEMSTICK_SYS_BAMD; 735 736 if (full) { 737 error = host->set_param(host, 738 MEMSTICK_POWER, MEMSTICK_POWER_OFF); 739 if (error) 740 goto out_error; 741 742 msb_invalidate_reg_window(msb); 743 744 error = host->set_param(host, 745 MEMSTICK_POWER, MEMSTICK_POWER_ON); 746 if (error) 747 goto out_error; 748 749 error = host->set_param(host, 750 MEMSTICK_INTERFACE, MEMSTICK_SERIAL); 751 if (error) { 752 out_error: 753 dbg("Failed to reset the host controller"); 754 msb->read_only = true; 755 return -EFAULT; 756 } 757 } 758 759 error = msb_run_state_machine(msb, h_msb_reset); 760 if (error) { 761 dbg("Failed to reset the card"); 762 msb->read_only = true; 763 return -ENODEV; 764 } 765 766 /* Set parallel mode */ 767 if (was_parallel) 768 msb_switch_to_parallel(msb); 769 return 0; 770 } 771 772 /* Attempts to switch interface to parallel mode */ 773 static int msb_switch_to_parallel(struct msb_data *msb) 774 { 775 int error; 776 777 error = msb_run_state_machine(msb, h_msb_parallel_switch); 778 if (error) { 779 pr_err("Switch to parallel failed"); 780 msb->regs.param.system &= ~MEMSTICK_SYS_PAM; 781 msb_reset(msb, true); 782 return -EFAULT; 783 } 784 785 msb->caps |= MEMSTICK_CAP_AUTO_GET_INT; 786 return 0; 787 } 788 789 /* Changes overwrite flag on a page */ 790 static int msb_set_overwrite_flag(struct msb_data *msb, 791 u16 pba, u8 page, u8 flag) 792 { 793 if (msb->read_only) 794 return -EROFS; 795 796 msb->regs.param.block_address = cpu_to_be16(pba); 797 msb->regs.param.page_address = page; 798 msb->regs.param.cp = MEMSTICK_CP_OVERWRITE; 799 msb->regs.extra_data.overwrite_flag = flag; 800 msb->command_value = MS_CMD_BLOCK_WRITE; 801 msb->command_need_oob = true; 802 803 dbg_verbose("changing overwrite flag to %02x for sector %d, page %d", 804 flag, pba, page); 805 return msb_run_state_machine(msb, h_msb_send_command); 806 } 807 808 static int msb_mark_bad(struct msb_data *msb, int pba) 809 { 810 pr_notice("marking pba %d as bad", pba); 811 msb_reset(msb, true); 812 return msb_set_overwrite_flag( 813 msb, pba, 0, 0xFF & ~MEMSTICK_OVERWRITE_BKST); 814 } 815 816 static int msb_mark_page_bad(struct msb_data *msb, int pba, int page) 817 { 818 dbg("marking page %d of pba %d as bad", page, pba); 819 msb_reset(msb, true); 820 return msb_set_overwrite_flag(msb, 821 pba, page, ~MEMSTICK_OVERWRITE_PGST0); 822 } 823 824 /* Erases one physical block */ 825 static int msb_erase_block(struct msb_data *msb, u16 pba) 826 { 827 int error, try; 828 if (msb->read_only) 829 return -EROFS; 830 831 dbg_verbose("erasing pba %d", pba); 832 833 for (try = 1; try < 3; try++) { 834 msb->regs.param.block_address = cpu_to_be16(pba); 835 msb->regs.param.page_address = 0; 836 msb->regs.param.cp = MEMSTICK_CP_BLOCK; 837 msb->command_value = MS_CMD_BLOCK_ERASE; 838 msb->command_need_oob = false; 839 840 841 error = msb_run_state_machine(msb, h_msb_send_command); 842 if (!error || msb_reset(msb, true)) 843 break; 844 } 845 846 if (error) { 847 pr_err("erase failed, marking pba %d as bad", pba); 848 msb_mark_bad(msb, pba); 849 } 850 851 dbg_verbose("erase success, marking pba %d as unused", pba); 852 msb_mark_block_unused(msb, pba); 853 __set_bit(pba, msb->erased_blocks_bitmap); 854 return error; 855 } 856 857 /* Reads one page from device */ 858 static int msb_read_page(struct msb_data *msb, 859 u16 pba, u8 page, struct ms_extra_data_register *extra, 860 struct scatterlist *sg, int offset) 861 { 862 int try, error; 863 864 if (pba == MS_BLOCK_INVALID) { 865 unsigned long flags; 866 struct sg_mapping_iter miter; 867 size_t len = msb->page_size; 868 869 dbg_verbose("read unmapped sector. returning 0xFF"); 870 871 local_irq_save(flags); 872 sg_miter_start(&miter, sg, sg_nents(sg), 873 SG_MITER_ATOMIC | SG_MITER_TO_SG); 874 875 while (sg_miter_next(&miter) && len > 0) { 876 877 int chunklen; 878 879 if (offset && offset >= miter.length) { 880 offset -= miter.length; 881 continue; 882 } 883 884 chunklen = min(miter.length - offset, len); 885 memset(miter.addr + offset, 0xFF, chunklen); 886 len -= chunklen; 887 offset = 0; 888 } 889 890 sg_miter_stop(&miter); 891 local_irq_restore(flags); 892 893 if (offset) 894 return -EFAULT; 895 896 if (extra) 897 memset(extra, 0xFF, sizeof(*extra)); 898 return 0; 899 } 900 901 if (pba >= msb->block_count) { 902 pr_err("BUG: attempt to read beyond the end of the card at pba %d", pba); 903 return -EINVAL; 904 } 905 906 for (try = 1; try < 3; try++) { 907 msb->regs.param.block_address = cpu_to_be16(pba); 908 msb->regs.param.page_address = page; 909 msb->regs.param.cp = MEMSTICK_CP_PAGE; 910 911 msb->current_sg = sg; 912 msb->current_sg_offset = offset; 913 error = msb_run_state_machine(msb, h_msb_read_page); 914 915 916 if (error == -EUCLEAN) { 917 pr_notice("correctable error on pba %d, page %d", 918 pba, page); 919 error = 0; 920 } 921 922 if (!error && extra) 923 *extra = msb->regs.extra_data; 924 925 if (!error || msb_reset(msb, true)) 926 break; 927 928 } 929 930 /* Mark bad pages */ 931 if (error == -EBADMSG) { 932 pr_err("uncorrectable error on read of pba %d, page %d", 933 pba, page); 934 935 if (msb->regs.extra_data.overwrite_flag & 936 MEMSTICK_OVERWRITE_PGST0) 937 msb_mark_page_bad(msb, pba, page); 938 return -EBADMSG; 939 } 940 941 if (error) 942 pr_err("read of pba %d, page %d failed with error %d", 943 pba, page, error); 944 return error; 945 } 946 947 /* Reads oob of page only */ 948 static int msb_read_oob(struct msb_data *msb, u16 pba, u16 page, 949 struct ms_extra_data_register *extra) 950 { 951 int error; 952 953 BUG_ON(!extra); 954 msb->regs.param.block_address = cpu_to_be16(pba); 955 msb->regs.param.page_address = page; 956 msb->regs.param.cp = MEMSTICK_CP_EXTRA; 957 958 if (pba > msb->block_count) { 959 pr_err("BUG: attempt to read beyond the end of card at pba %d", pba); 960 return -EINVAL; 961 } 962 963 error = msb_run_state_machine(msb, h_msb_read_page); 964 *extra = msb->regs.extra_data; 965 966 if (error == -EUCLEAN) { 967 pr_notice("correctable error on pba %d, page %d", 968 pba, page); 969 return 0; 970 } 971 972 return error; 973 } 974 975 /* Reads a block and compares it with data contained in scatterlist orig_sg */ 976 static int msb_verify_block(struct msb_data *msb, u16 pba, 977 struct scatterlist *orig_sg, int offset) 978 { 979 struct scatterlist sg; 980 int page = 0, error; 981 982 sg_init_one(&sg, msb->block_buffer, msb->block_size); 983 984 while (page < msb->pages_in_block) { 985 986 error = msb_read_page(msb, pba, page, 987 NULL, &sg, page * msb->page_size); 988 if (error) 989 return error; 990 page++; 991 } 992 993 if (msb_sg_compare_to_buffer(orig_sg, offset, 994 msb->block_buffer, msb->block_size)) 995 return -EIO; 996 return 0; 997 } 998 999 /* Writes exectly one block + oob */ 1000 static int msb_write_block(struct msb_data *msb, 1001 u16 pba, u32 lba, struct scatterlist *sg, int offset) 1002 { 1003 int error, current_try = 1; 1004 BUG_ON(sg->length < msb->page_size); 1005 1006 if (msb->read_only) 1007 return -EROFS; 1008 1009 if (pba == MS_BLOCK_INVALID) { 1010 pr_err( 1011 "BUG: write: attempt to write MS_BLOCK_INVALID block"); 1012 return -EINVAL; 1013 } 1014 1015 if (pba >= msb->block_count || lba >= msb->logical_block_count) { 1016 pr_err( 1017 "BUG: write: attempt to write beyond the end of device"); 1018 return -EINVAL; 1019 } 1020 1021 if (msb_get_zone_from_lba(lba) != msb_get_zone_from_pba(pba)) { 1022 pr_err("BUG: write: lba zone mismatch"); 1023 return -EINVAL; 1024 } 1025 1026 if (pba == msb->boot_block_locations[0] || 1027 pba == msb->boot_block_locations[1]) { 1028 pr_err("BUG: write: attempt to write to boot blocks!"); 1029 return -EINVAL; 1030 } 1031 1032 while (1) { 1033 1034 if (msb->read_only) 1035 return -EROFS; 1036 1037 msb->regs.param.cp = MEMSTICK_CP_BLOCK; 1038 msb->regs.param.page_address = 0; 1039 msb->regs.param.block_address = cpu_to_be16(pba); 1040 1041 msb->regs.extra_data.management_flag = 0xFF; 1042 msb->regs.extra_data.overwrite_flag = 0xF8; 1043 msb->regs.extra_data.logical_address = cpu_to_be16(lba); 1044 1045 msb->current_sg = sg; 1046 msb->current_sg_offset = offset; 1047 msb->current_page = 0; 1048 1049 error = msb_run_state_machine(msb, h_msb_write_block); 1050 1051 /* Sector we just wrote to is assumed erased since its pba 1052 was erased. If it wasn't erased, write will succeed 1053 and will just clear the bits that were set in the block 1054 thus test that what we have written, 1055 matches what we expect. 1056 We do trust the blocks that we erased */ 1057 if (!error && (verify_writes || 1058 !test_bit(pba, msb->erased_blocks_bitmap))) 1059 error = msb_verify_block(msb, pba, sg, offset); 1060 1061 if (!error) 1062 break; 1063 1064 if (current_try > 1 || msb_reset(msb, true)) 1065 break; 1066 1067 pr_err("write failed, trying to erase the pba %d", pba); 1068 error = msb_erase_block(msb, pba); 1069 if (error) 1070 break; 1071 1072 current_try++; 1073 } 1074 return error; 1075 } 1076 1077 /* Finds a free block for write replacement */ 1078 static u16 msb_get_free_block(struct msb_data *msb, int zone) 1079 { 1080 u16 pos; 1081 int pba = zone * MS_BLOCKS_IN_ZONE; 1082 int i; 1083 1084 get_random_bytes(&pos, sizeof(pos)); 1085 1086 if (!msb->free_block_count[zone]) { 1087 pr_err("NO free blocks in the zone %d, to use for a write, (media is WORN out) switching to RO mode", zone); 1088 msb->read_only = true; 1089 return MS_BLOCK_INVALID; 1090 } 1091 1092 pos %= msb->free_block_count[zone]; 1093 1094 dbg_verbose("have %d choices for a free block, selected randomally: %d", 1095 msb->free_block_count[zone], pos); 1096 1097 pba = find_next_zero_bit(msb->used_blocks_bitmap, 1098 msb->block_count, pba); 1099 for (i = 0; i < pos; ++i) 1100 pba = find_next_zero_bit(msb->used_blocks_bitmap, 1101 msb->block_count, pba + 1); 1102 1103 dbg_verbose("result of the free blocks scan: pba %d", pba); 1104 1105 if (pba == msb->block_count || (msb_get_zone_from_pba(pba)) != zone) { 1106 pr_err("BUG: cant get a free block"); 1107 msb->read_only = true; 1108 return MS_BLOCK_INVALID; 1109 } 1110 1111 msb_mark_block_used(msb, pba); 1112 return pba; 1113 } 1114 1115 static int msb_update_block(struct msb_data *msb, u16 lba, 1116 struct scatterlist *sg, int offset) 1117 { 1118 u16 pba, new_pba; 1119 int error, try; 1120 1121 pba = msb->lba_to_pba_table[lba]; 1122 dbg_verbose("start of a block update at lba %d, pba %d", lba, pba); 1123 1124 if (pba != MS_BLOCK_INVALID) { 1125 dbg_verbose("setting the update flag on the block"); 1126 msb_set_overwrite_flag(msb, pba, 0, 1127 0xFF & ~MEMSTICK_OVERWRITE_UDST); 1128 } 1129 1130 for (try = 0; try < 3; try++) { 1131 new_pba = msb_get_free_block(msb, 1132 msb_get_zone_from_lba(lba)); 1133 1134 if (new_pba == MS_BLOCK_INVALID) { 1135 error = -EIO; 1136 goto out; 1137 } 1138 1139 dbg_verbose("block update: writing updated block to the pba %d", 1140 new_pba); 1141 error = msb_write_block(msb, new_pba, lba, sg, offset); 1142 if (error == -EBADMSG) { 1143 msb_mark_bad(msb, new_pba); 1144 continue; 1145 } 1146 1147 if (error) 1148 goto out; 1149 1150 dbg_verbose("block update: erasing the old block"); 1151 msb_erase_block(msb, pba); 1152 msb->lba_to_pba_table[lba] = new_pba; 1153 return 0; 1154 } 1155 out: 1156 if (error) { 1157 pr_err("block update error after %d tries, switching to r/o mode", try); 1158 msb->read_only = true; 1159 } 1160 return error; 1161 } 1162 1163 /* Converts endiannes in the boot block for easy use */ 1164 static void msb_fix_boot_page_endianness(struct ms_boot_page *p) 1165 { 1166 p->header.block_id = be16_to_cpu(p->header.block_id); 1167 p->header.format_reserved = be16_to_cpu(p->header.format_reserved); 1168 p->entry.disabled_block.start_addr 1169 = be32_to_cpu(p->entry.disabled_block.start_addr); 1170 p->entry.disabled_block.data_size 1171 = be32_to_cpu(p->entry.disabled_block.data_size); 1172 p->entry.cis_idi.start_addr 1173 = be32_to_cpu(p->entry.cis_idi.start_addr); 1174 p->entry.cis_idi.data_size 1175 = be32_to_cpu(p->entry.cis_idi.data_size); 1176 p->attr.block_size = be16_to_cpu(p->attr.block_size); 1177 p->attr.number_of_blocks = be16_to_cpu(p->attr.number_of_blocks); 1178 p->attr.number_of_effective_blocks 1179 = be16_to_cpu(p->attr.number_of_effective_blocks); 1180 p->attr.page_size = be16_to_cpu(p->attr.page_size); 1181 p->attr.memory_manufacturer_code 1182 = be16_to_cpu(p->attr.memory_manufacturer_code); 1183 p->attr.memory_device_code = be16_to_cpu(p->attr.memory_device_code); 1184 p->attr.implemented_capacity 1185 = be16_to_cpu(p->attr.implemented_capacity); 1186 p->attr.controller_number = be16_to_cpu(p->attr.controller_number); 1187 p->attr.controller_function = be16_to_cpu(p->attr.controller_function); 1188 } 1189 1190 static int msb_read_boot_blocks(struct msb_data *msb) 1191 { 1192 int pba = 0; 1193 struct scatterlist sg; 1194 struct ms_extra_data_register extra; 1195 struct ms_boot_page *page; 1196 1197 msb->boot_block_locations[0] = MS_BLOCK_INVALID; 1198 msb->boot_block_locations[1] = MS_BLOCK_INVALID; 1199 msb->boot_block_count = 0; 1200 1201 dbg_verbose("Start of a scan for the boot blocks"); 1202 1203 if (!msb->boot_page) { 1204 page = kmalloc(sizeof(struct ms_boot_page)*2, GFP_KERNEL); 1205 if (!page) 1206 return -ENOMEM; 1207 1208 msb->boot_page = page; 1209 } else 1210 page = msb->boot_page; 1211 1212 msb->block_count = MS_BLOCK_MAX_BOOT_ADDR; 1213 1214 for (pba = 0; pba < MS_BLOCK_MAX_BOOT_ADDR; pba++) { 1215 1216 sg_init_one(&sg, page, sizeof(*page)); 1217 if (msb_read_page(msb, pba, 0, &extra, &sg, 0)) { 1218 dbg("boot scan: can't read pba %d", pba); 1219 continue; 1220 } 1221 1222 if (extra.management_flag & MEMSTICK_MANAGEMENT_SYSFLG) { 1223 dbg("management flag doesn't indicate boot block %d", 1224 pba); 1225 continue; 1226 } 1227 1228 if (be16_to_cpu(page->header.block_id) != MS_BLOCK_BOOT_ID) { 1229 dbg("the pba at %d doesn' contain boot block ID", pba); 1230 continue; 1231 } 1232 1233 msb_fix_boot_page_endianness(page); 1234 msb->boot_block_locations[msb->boot_block_count] = pba; 1235 1236 page++; 1237 msb->boot_block_count++; 1238 1239 if (msb->boot_block_count == 2) 1240 break; 1241 } 1242 1243 if (!msb->boot_block_count) { 1244 pr_err("media doesn't contain master page, aborting"); 1245 return -EIO; 1246 } 1247 1248 dbg_verbose("End of scan for boot blocks"); 1249 return 0; 1250 } 1251 1252 static int msb_read_bad_block_table(struct msb_data *msb, int block_nr) 1253 { 1254 struct ms_boot_page *boot_block; 1255 struct scatterlist sg; 1256 u16 *buffer = NULL; 1257 int offset = 0; 1258 int i, error = 0; 1259 int data_size, data_offset, page, page_offset, size_to_read; 1260 u16 pba; 1261 1262 BUG_ON(block_nr > 1); 1263 boot_block = &msb->boot_page[block_nr]; 1264 pba = msb->boot_block_locations[block_nr]; 1265 1266 if (msb->boot_block_locations[block_nr] == MS_BLOCK_INVALID) 1267 return -EINVAL; 1268 1269 data_size = boot_block->entry.disabled_block.data_size; 1270 data_offset = sizeof(struct ms_boot_page) + 1271 boot_block->entry.disabled_block.start_addr; 1272 if (!data_size) 1273 return 0; 1274 1275 page = data_offset / msb->page_size; 1276 page_offset = data_offset % msb->page_size; 1277 size_to_read = 1278 DIV_ROUND_UP(data_size + page_offset, msb->page_size) * 1279 msb->page_size; 1280 1281 dbg("reading bad block of boot block at pba %d, offset %d len %d", 1282 pba, data_offset, data_size); 1283 1284 buffer = kzalloc(size_to_read, GFP_KERNEL); 1285 if (!buffer) 1286 return -ENOMEM; 1287 1288 /* Read the buffer */ 1289 sg_init_one(&sg, buffer, size_to_read); 1290 1291 while (offset < size_to_read) { 1292 error = msb_read_page(msb, pba, page, NULL, &sg, offset); 1293 if (error) 1294 goto out; 1295 1296 page++; 1297 offset += msb->page_size; 1298 1299 if (page == msb->pages_in_block) { 1300 pr_err( 1301 "bad block table extends beyond the boot block"); 1302 break; 1303 } 1304 } 1305 1306 /* Process the bad block table */ 1307 for (i = page_offset; i < data_size / sizeof(u16); i++) { 1308 1309 u16 bad_block = be16_to_cpu(buffer[i]); 1310 1311 if (bad_block >= msb->block_count) { 1312 dbg("bad block table contains invalid block %d", 1313 bad_block); 1314 continue; 1315 } 1316 1317 if (test_bit(bad_block, msb->used_blocks_bitmap)) { 1318 dbg("duplicate bad block %d in the table", 1319 bad_block); 1320 continue; 1321 } 1322 1323 dbg("block %d is marked as factory bad", bad_block); 1324 msb_mark_block_used(msb, bad_block); 1325 } 1326 out: 1327 kfree(buffer); 1328 return error; 1329 } 1330 1331 static int msb_ftl_initialize(struct msb_data *msb) 1332 { 1333 int i; 1334 1335 if (msb->ftl_initialized) 1336 return 0; 1337 1338 msb->zone_count = msb->block_count / MS_BLOCKS_IN_ZONE; 1339 msb->logical_block_count = msb->zone_count * 496 - 2; 1340 1341 msb->used_blocks_bitmap = kzalloc(msb->block_count / 8, GFP_KERNEL); 1342 msb->erased_blocks_bitmap = kzalloc(msb->block_count / 8, GFP_KERNEL); 1343 msb->lba_to_pba_table = 1344 kmalloc(msb->logical_block_count * sizeof(u16), GFP_KERNEL); 1345 1346 if (!msb->used_blocks_bitmap || !msb->lba_to_pba_table || 1347 !msb->erased_blocks_bitmap) { 1348 kfree(msb->used_blocks_bitmap); 1349 kfree(msb->lba_to_pba_table); 1350 kfree(msb->erased_blocks_bitmap); 1351 return -ENOMEM; 1352 } 1353 1354 for (i = 0; i < msb->zone_count; i++) 1355 msb->free_block_count[i] = MS_BLOCKS_IN_ZONE; 1356 1357 memset(msb->lba_to_pba_table, MS_BLOCK_INVALID, 1358 msb->logical_block_count * sizeof(u16)); 1359 1360 dbg("initial FTL tables created. Zone count = %d, Logical block count = %d", 1361 msb->zone_count, msb->logical_block_count); 1362 1363 msb->ftl_initialized = true; 1364 return 0; 1365 } 1366 1367 static int msb_ftl_scan(struct msb_data *msb) 1368 { 1369 u16 pba, lba, other_block; 1370 u8 overwrite_flag, management_flag, other_overwrite_flag; 1371 int error; 1372 struct ms_extra_data_register extra; 1373 u8 *overwrite_flags = kzalloc(msb->block_count, GFP_KERNEL); 1374 1375 if (!overwrite_flags) 1376 return -ENOMEM; 1377 1378 dbg("Start of media scanning"); 1379 for (pba = 0; pba < msb->block_count; pba++) { 1380 1381 if (pba == msb->boot_block_locations[0] || 1382 pba == msb->boot_block_locations[1]) { 1383 dbg_verbose("pba %05d -> [boot block]", pba); 1384 msb_mark_block_used(msb, pba); 1385 continue; 1386 } 1387 1388 if (test_bit(pba, msb->used_blocks_bitmap)) { 1389 dbg_verbose("pba %05d -> [factory bad]", pba); 1390 continue; 1391 } 1392 1393 memset(&extra, 0, sizeof(extra)); 1394 error = msb_read_oob(msb, pba, 0, &extra); 1395 1396 /* can't trust the page if we can't read the oob */ 1397 if (error == -EBADMSG) { 1398 pr_notice( 1399 "oob of pba %d damaged, will try to erase it", pba); 1400 msb_mark_block_used(msb, pba); 1401 msb_erase_block(msb, pba); 1402 continue; 1403 } else if (error) { 1404 pr_err("unknown error %d on read of oob of pba %d - aborting", 1405 error, pba); 1406 1407 kfree(overwrite_flags); 1408 return error; 1409 } 1410 1411 lba = be16_to_cpu(extra.logical_address); 1412 management_flag = extra.management_flag; 1413 overwrite_flag = extra.overwrite_flag; 1414 overwrite_flags[pba] = overwrite_flag; 1415 1416 /* Skip bad blocks */ 1417 if (!(overwrite_flag & MEMSTICK_OVERWRITE_BKST)) { 1418 dbg("pba %05d -> [BAD]", pba); 1419 msb_mark_block_used(msb, pba); 1420 continue; 1421 } 1422 1423 /* Skip system/drm blocks */ 1424 if ((management_flag & MEMSTICK_MANAGEMENT_FLAG_NORMAL) != 1425 MEMSTICK_MANAGEMENT_FLAG_NORMAL) { 1426 dbg("pba %05d -> [reserved management flag %02x]", 1427 pba, management_flag); 1428 msb_mark_block_used(msb, pba); 1429 continue; 1430 } 1431 1432 /* Erase temporary tables */ 1433 if (!(management_flag & MEMSTICK_MANAGEMENT_ATFLG)) { 1434 dbg("pba %05d -> [temp table] - will erase", pba); 1435 1436 msb_mark_block_used(msb, pba); 1437 msb_erase_block(msb, pba); 1438 continue; 1439 } 1440 1441 if (lba == MS_BLOCK_INVALID) { 1442 dbg_verbose("pba %05d -> [free]", pba); 1443 continue; 1444 } 1445 1446 msb_mark_block_used(msb, pba); 1447 1448 /* Block has LBA not according to zoning*/ 1449 if (msb_get_zone_from_lba(lba) != msb_get_zone_from_pba(pba)) { 1450 pr_notice("pba %05d -> [bad lba %05d] - will erase", 1451 pba, lba); 1452 msb_erase_block(msb, pba); 1453 continue; 1454 } 1455 1456 /* No collisions - great */ 1457 if (msb->lba_to_pba_table[lba] == MS_BLOCK_INVALID) { 1458 dbg_verbose("pba %05d -> [lba %05d]", pba, lba); 1459 msb->lba_to_pba_table[lba] = pba; 1460 continue; 1461 } 1462 1463 other_block = msb->lba_to_pba_table[lba]; 1464 other_overwrite_flag = overwrite_flags[other_block]; 1465 1466 pr_notice("Collision between pba %d and pba %d", 1467 pba, other_block); 1468 1469 if (!(overwrite_flag & MEMSTICK_OVERWRITE_UDST)) { 1470 pr_notice("pba %d is marked as stable, use it", pba); 1471 msb_erase_block(msb, other_block); 1472 msb->lba_to_pba_table[lba] = pba; 1473 continue; 1474 } 1475 1476 if (!(other_overwrite_flag & MEMSTICK_OVERWRITE_UDST)) { 1477 pr_notice("pba %d is marked as stable, use it", 1478 other_block); 1479 msb_erase_block(msb, pba); 1480 continue; 1481 } 1482 1483 pr_notice("collision between blocks %d and %d, without stable flag set on both, erasing pba %d", 1484 pba, other_block, other_block); 1485 1486 msb_erase_block(msb, other_block); 1487 msb->lba_to_pba_table[lba] = pba; 1488 } 1489 1490 dbg("End of media scanning"); 1491 kfree(overwrite_flags); 1492 return 0; 1493 } 1494 1495 static void msb_cache_flush_timer(unsigned long data) 1496 { 1497 struct msb_data *msb = (struct msb_data *)data; 1498 msb->need_flush_cache = true; 1499 queue_work(msb->io_queue, &msb->io_work); 1500 } 1501 1502 1503 static void msb_cache_discard(struct msb_data *msb) 1504 { 1505 if (msb->cache_block_lba == MS_BLOCK_INVALID) 1506 return; 1507 1508 del_timer_sync(&msb->cache_flush_timer); 1509 1510 dbg_verbose("Discarding the write cache"); 1511 msb->cache_block_lba = MS_BLOCK_INVALID; 1512 bitmap_zero(&msb->valid_cache_bitmap, msb->pages_in_block); 1513 } 1514 1515 static int msb_cache_init(struct msb_data *msb) 1516 { 1517 setup_timer(&msb->cache_flush_timer, msb_cache_flush_timer, 1518 (unsigned long)msb); 1519 1520 if (!msb->cache) 1521 msb->cache = kzalloc(msb->block_size, GFP_KERNEL); 1522 if (!msb->cache) 1523 return -ENOMEM; 1524 1525 msb_cache_discard(msb); 1526 return 0; 1527 } 1528 1529 static int msb_cache_flush(struct msb_data *msb) 1530 { 1531 struct scatterlist sg; 1532 struct ms_extra_data_register extra; 1533 int page, offset, error; 1534 u16 pba, lba; 1535 1536 if (msb->read_only) 1537 return -EROFS; 1538 1539 if (msb->cache_block_lba == MS_BLOCK_INVALID) 1540 return 0; 1541 1542 lba = msb->cache_block_lba; 1543 pba = msb->lba_to_pba_table[lba]; 1544 1545 dbg_verbose("Flushing the write cache of pba %d (LBA %d)", 1546 pba, msb->cache_block_lba); 1547 1548 sg_init_one(&sg, msb->cache , msb->block_size); 1549 1550 /* Read all missing pages in cache */ 1551 for (page = 0; page < msb->pages_in_block; page++) { 1552 1553 if (test_bit(page, &msb->valid_cache_bitmap)) 1554 continue; 1555 1556 offset = page * msb->page_size; 1557 1558 dbg_verbose("reading non-present sector %d of cache block %d", 1559 page, lba); 1560 error = msb_read_page(msb, pba, page, &extra, &sg, offset); 1561 1562 /* Bad pages are copied with 00 page status */ 1563 if (error == -EBADMSG) { 1564 pr_err("read error on sector %d, contents probably damaged", page); 1565 continue; 1566 } 1567 1568 if (error) 1569 return error; 1570 1571 if ((extra.overwrite_flag & MEMSTICK_OV_PG_NORMAL) != 1572 MEMSTICK_OV_PG_NORMAL) { 1573 dbg("page %d is marked as bad", page); 1574 continue; 1575 } 1576 1577 set_bit(page, &msb->valid_cache_bitmap); 1578 } 1579 1580 /* Write the cache now */ 1581 error = msb_update_block(msb, msb->cache_block_lba, &sg, 0); 1582 pba = msb->lba_to_pba_table[msb->cache_block_lba]; 1583 1584 /* Mark invalid pages */ 1585 if (!error) { 1586 for (page = 0; page < msb->pages_in_block; page++) { 1587 1588 if (test_bit(page, &msb->valid_cache_bitmap)) 1589 continue; 1590 1591 dbg("marking page %d as containing damaged data", 1592 page); 1593 msb_set_overwrite_flag(msb, 1594 pba , page, 0xFF & ~MEMSTICK_OV_PG_NORMAL); 1595 } 1596 } 1597 1598 msb_cache_discard(msb); 1599 return error; 1600 } 1601 1602 static int msb_cache_write(struct msb_data *msb, int lba, 1603 int page, bool add_to_cache_only, struct scatterlist *sg, int offset) 1604 { 1605 int error; 1606 struct scatterlist sg_tmp[10]; 1607 1608 if (msb->read_only) 1609 return -EROFS; 1610 1611 if (msb->cache_block_lba == MS_BLOCK_INVALID || 1612 lba != msb->cache_block_lba) 1613 if (add_to_cache_only) 1614 return 0; 1615 1616 /* If we need to write different block */ 1617 if (msb->cache_block_lba != MS_BLOCK_INVALID && 1618 lba != msb->cache_block_lba) { 1619 dbg_verbose("first flush the cache"); 1620 error = msb_cache_flush(msb); 1621 if (error) 1622 return error; 1623 } 1624 1625 if (msb->cache_block_lba == MS_BLOCK_INVALID) { 1626 msb->cache_block_lba = lba; 1627 mod_timer(&msb->cache_flush_timer, 1628 jiffies + msecs_to_jiffies(cache_flush_timeout)); 1629 } 1630 1631 dbg_verbose("Write of LBA %d page %d to cache ", lba, page); 1632 1633 sg_init_table(sg_tmp, ARRAY_SIZE(sg_tmp)); 1634 msb_sg_copy(sg, sg_tmp, ARRAY_SIZE(sg_tmp), offset, msb->page_size); 1635 1636 sg_copy_to_buffer(sg_tmp, sg_nents(sg_tmp), 1637 msb->cache + page * msb->page_size, msb->page_size); 1638 1639 set_bit(page, &msb->valid_cache_bitmap); 1640 return 0; 1641 } 1642 1643 static int msb_cache_read(struct msb_data *msb, int lba, 1644 int page, struct scatterlist *sg, int offset) 1645 { 1646 int pba = msb->lba_to_pba_table[lba]; 1647 struct scatterlist sg_tmp[10]; 1648 int error = 0; 1649 1650 if (lba == msb->cache_block_lba && 1651 test_bit(page, &msb->valid_cache_bitmap)) { 1652 1653 dbg_verbose("Read of LBA %d (pba %d) sector %d from cache", 1654 lba, pba, page); 1655 1656 sg_init_table(sg_tmp, ARRAY_SIZE(sg_tmp)); 1657 msb_sg_copy(sg, sg_tmp, ARRAY_SIZE(sg_tmp), 1658 offset, msb->page_size); 1659 sg_copy_from_buffer(sg_tmp, sg_nents(sg_tmp), 1660 msb->cache + msb->page_size * page, 1661 msb->page_size); 1662 } else { 1663 dbg_verbose("Read of LBA %d (pba %d) sector %d from device", 1664 lba, pba, page); 1665 1666 error = msb_read_page(msb, pba, page, NULL, sg, offset); 1667 if (error) 1668 return error; 1669 1670 msb_cache_write(msb, lba, page, true, sg, offset); 1671 } 1672 return error; 1673 } 1674 1675 /* Emulated geometry table 1676 * This table content isn't that importaint, 1677 * One could put here different values, providing that they still 1678 * cover whole disk. 1679 * 64 MB entry is what windows reports for my 64M memstick */ 1680 1681 static const struct chs_entry chs_table[] = { 1682 /* size sectors cylynders heads */ 1683 { 4, 16, 247, 2 }, 1684 { 8, 16, 495, 2 }, 1685 { 16, 16, 495, 4 }, 1686 { 32, 16, 991, 4 }, 1687 { 64, 16, 991, 8 }, 1688 {128, 16, 991, 16 }, 1689 { 0 } 1690 }; 1691 1692 /* Load information about the card */ 1693 static int msb_init_card(struct memstick_dev *card) 1694 { 1695 struct msb_data *msb = memstick_get_drvdata(card); 1696 struct memstick_host *host = card->host; 1697 struct ms_boot_page *boot_block; 1698 int error = 0, i, raw_size_in_megs; 1699 1700 msb->caps = 0; 1701 1702 if (card->id.class >= MEMSTICK_CLASS_ROM && 1703 card->id.class <= MEMSTICK_CLASS_ROM) 1704 msb->read_only = true; 1705 1706 msb->state = -1; 1707 error = msb_reset(msb, false); 1708 if (error) 1709 return error; 1710 1711 /* Due to a bug in Jmicron driver written by Alex Dubov, 1712 its serial mode barely works, 1713 so we switch to parallel mode right away */ 1714 if (host->caps & MEMSTICK_CAP_PAR4) 1715 msb_switch_to_parallel(msb); 1716 1717 msb->page_size = sizeof(struct ms_boot_page); 1718 1719 /* Read the boot page */ 1720 error = msb_read_boot_blocks(msb); 1721 if (error) 1722 return -EIO; 1723 1724 boot_block = &msb->boot_page[0]; 1725 1726 /* Save intersting attributes from boot page */ 1727 msb->block_count = boot_block->attr.number_of_blocks; 1728 msb->page_size = boot_block->attr.page_size; 1729 1730 msb->pages_in_block = boot_block->attr.block_size * 2; 1731 msb->block_size = msb->page_size * msb->pages_in_block; 1732 1733 if (msb->page_size > PAGE_SIZE) { 1734 /* this isn't supported by linux at all, anyway*/ 1735 dbg("device page %d size isn't supported", msb->page_size); 1736 return -EINVAL; 1737 } 1738 1739 msb->block_buffer = kzalloc(msb->block_size, GFP_KERNEL); 1740 if (!msb->block_buffer) 1741 return -ENOMEM; 1742 1743 raw_size_in_megs = (msb->block_size * msb->block_count) >> 20; 1744 1745 for (i = 0; chs_table[i].size; i++) { 1746 1747 if (chs_table[i].size != raw_size_in_megs) 1748 continue; 1749 1750 msb->geometry.cylinders = chs_table[i].cyl; 1751 msb->geometry.heads = chs_table[i].head; 1752 msb->geometry.sectors = chs_table[i].sec; 1753 break; 1754 } 1755 1756 if (boot_block->attr.transfer_supporting == 1) 1757 msb->caps |= MEMSTICK_CAP_PAR4; 1758 1759 if (boot_block->attr.device_type & 0x03) 1760 msb->read_only = true; 1761 1762 dbg("Total block count = %d", msb->block_count); 1763 dbg("Each block consists of %d pages", msb->pages_in_block); 1764 dbg("Page size = %d bytes", msb->page_size); 1765 dbg("Parallel mode supported: %d", !!(msb->caps & MEMSTICK_CAP_PAR4)); 1766 dbg("Read only: %d", msb->read_only); 1767 1768 #if 0 1769 /* Now we can switch the interface */ 1770 if (host->caps & msb->caps & MEMSTICK_CAP_PAR4) 1771 msb_switch_to_parallel(msb); 1772 #endif 1773 1774 error = msb_cache_init(msb); 1775 if (error) 1776 return error; 1777 1778 error = msb_ftl_initialize(msb); 1779 if (error) 1780 return error; 1781 1782 1783 /* Read the bad block table */ 1784 error = msb_read_bad_block_table(msb, 0); 1785 1786 if (error && error != -ENOMEM) { 1787 dbg("failed to read bad block table from primary boot block, trying from backup"); 1788 error = msb_read_bad_block_table(msb, 1); 1789 } 1790 1791 if (error) 1792 return error; 1793 1794 /* *drum roll* Scan the media */ 1795 error = msb_ftl_scan(msb); 1796 if (error) { 1797 pr_err("Scan of media failed"); 1798 return error; 1799 } 1800 1801 return 0; 1802 1803 } 1804 1805 static int msb_do_write_request(struct msb_data *msb, int lba, 1806 int page, struct scatterlist *sg, size_t len, int *sucessfuly_written) 1807 { 1808 int error = 0; 1809 off_t offset = 0; 1810 *sucessfuly_written = 0; 1811 1812 while (offset < len) { 1813 if (page == 0 && len - offset >= msb->block_size) { 1814 1815 if (msb->cache_block_lba == lba) 1816 msb_cache_discard(msb); 1817 1818 dbg_verbose("Writing whole lba %d", lba); 1819 error = msb_update_block(msb, lba, sg, offset); 1820 if (error) 1821 return error; 1822 1823 offset += msb->block_size; 1824 *sucessfuly_written += msb->block_size; 1825 lba++; 1826 continue; 1827 } 1828 1829 error = msb_cache_write(msb, lba, page, false, sg, offset); 1830 if (error) 1831 return error; 1832 1833 offset += msb->page_size; 1834 *sucessfuly_written += msb->page_size; 1835 1836 page++; 1837 if (page == msb->pages_in_block) { 1838 page = 0; 1839 lba++; 1840 } 1841 } 1842 return 0; 1843 } 1844 1845 static int msb_do_read_request(struct msb_data *msb, int lba, 1846 int page, struct scatterlist *sg, int len, int *sucessfuly_read) 1847 { 1848 int error = 0; 1849 int offset = 0; 1850 *sucessfuly_read = 0; 1851 1852 while (offset < len) { 1853 1854 error = msb_cache_read(msb, lba, page, sg, offset); 1855 if (error) 1856 return error; 1857 1858 offset += msb->page_size; 1859 *sucessfuly_read += msb->page_size; 1860 1861 page++; 1862 if (page == msb->pages_in_block) { 1863 page = 0; 1864 lba++; 1865 } 1866 } 1867 return 0; 1868 } 1869 1870 static void msb_io_work(struct work_struct *work) 1871 { 1872 struct msb_data *msb = container_of(work, struct msb_data, io_work); 1873 int page, error, len; 1874 sector_t lba; 1875 unsigned long flags; 1876 struct scatterlist *sg = msb->prealloc_sg; 1877 1878 dbg_verbose("IO: work started"); 1879 1880 while (1) { 1881 spin_lock_irqsave(&msb->q_lock, flags); 1882 1883 if (msb->need_flush_cache) { 1884 msb->need_flush_cache = false; 1885 spin_unlock_irqrestore(&msb->q_lock, flags); 1886 msb_cache_flush(msb); 1887 continue; 1888 } 1889 1890 if (!msb->req) { 1891 msb->req = blk_fetch_request(msb->queue); 1892 if (!msb->req) { 1893 dbg_verbose("IO: no more requests exiting"); 1894 spin_unlock_irqrestore(&msb->q_lock, flags); 1895 return; 1896 } 1897 } 1898 1899 spin_unlock_irqrestore(&msb->q_lock, flags); 1900 1901 /* If card was removed meanwhile */ 1902 if (!msb->req) 1903 return; 1904 1905 /* process the request */ 1906 dbg_verbose("IO: processing new request"); 1907 blk_rq_map_sg(msb->queue, msb->req, sg); 1908 1909 lba = blk_rq_pos(msb->req); 1910 1911 sector_div(lba, msb->page_size / 512); 1912 page = sector_div(lba, msb->pages_in_block); 1913 1914 if (rq_data_dir(msb->req) == READ) 1915 error = msb_do_read_request(msb, lba, page, sg, 1916 blk_rq_bytes(msb->req), &len); 1917 else 1918 error = msb_do_write_request(msb, lba, page, sg, 1919 blk_rq_bytes(msb->req), &len); 1920 1921 spin_lock_irqsave(&msb->q_lock, flags); 1922 1923 if (len) 1924 if (!__blk_end_request(msb->req, 0, len)) 1925 msb->req = NULL; 1926 1927 if (error && msb->req) { 1928 dbg_verbose("IO: ending one sector of the request with error"); 1929 if (!__blk_end_request(msb->req, error, msb->page_size)) 1930 msb->req = NULL; 1931 } 1932 1933 if (msb->req) 1934 dbg_verbose("IO: request still pending"); 1935 1936 spin_unlock_irqrestore(&msb->q_lock, flags); 1937 } 1938 } 1939 1940 static DEFINE_IDR(msb_disk_idr); /*set of used disk numbers */ 1941 static DEFINE_MUTEX(msb_disk_lock); /* protects against races in open/release */ 1942 1943 static int msb_bd_open(struct block_device *bdev, fmode_t mode) 1944 { 1945 struct gendisk *disk = bdev->bd_disk; 1946 struct msb_data *msb = disk->private_data; 1947 1948 dbg_verbose("block device open"); 1949 1950 mutex_lock(&msb_disk_lock); 1951 1952 if (msb && msb->card) 1953 msb->usage_count++; 1954 1955 mutex_unlock(&msb_disk_lock); 1956 return 0; 1957 } 1958 1959 static void msb_data_clear(struct msb_data *msb) 1960 { 1961 kfree(msb->boot_page); 1962 kfree(msb->used_blocks_bitmap); 1963 kfree(msb->lba_to_pba_table); 1964 kfree(msb->cache); 1965 msb->card = NULL; 1966 } 1967 1968 static int msb_disk_release(struct gendisk *disk) 1969 { 1970 struct msb_data *msb = disk->private_data; 1971 1972 dbg_verbose("block device release"); 1973 mutex_lock(&msb_disk_lock); 1974 1975 if (msb) { 1976 if (msb->usage_count) 1977 msb->usage_count--; 1978 1979 if (!msb->usage_count) { 1980 disk->private_data = NULL; 1981 idr_remove(&msb_disk_idr, msb->disk_id); 1982 put_disk(disk); 1983 kfree(msb); 1984 } 1985 } 1986 mutex_unlock(&msb_disk_lock); 1987 return 0; 1988 } 1989 1990 static void msb_bd_release(struct gendisk *disk, fmode_t mode) 1991 { 1992 msb_disk_release(disk); 1993 } 1994 1995 static int msb_bd_getgeo(struct block_device *bdev, 1996 struct hd_geometry *geo) 1997 { 1998 struct msb_data *msb = bdev->bd_disk->private_data; 1999 *geo = msb->geometry; 2000 return 0; 2001 } 2002 2003 static int msb_prepare_req(struct request_queue *q, struct request *req) 2004 { 2005 if (req->cmd_type != REQ_TYPE_FS) { 2006 blk_dump_rq_flags(req, "MS unsupported request"); 2007 return BLKPREP_KILL; 2008 } 2009 req->rq_flags |= RQF_DONTPREP; 2010 return BLKPREP_OK; 2011 } 2012 2013 static void msb_submit_req(struct request_queue *q) 2014 { 2015 struct memstick_dev *card = q->queuedata; 2016 struct msb_data *msb = memstick_get_drvdata(card); 2017 struct request *req = NULL; 2018 2019 dbg_verbose("Submit request"); 2020 2021 if (msb->card_dead) { 2022 dbg("Refusing requests on removed card"); 2023 2024 WARN_ON(!msb->io_queue_stopped); 2025 2026 while ((req = blk_fetch_request(q)) != NULL) 2027 __blk_end_request_all(req, -ENODEV); 2028 return; 2029 } 2030 2031 if (msb->req) 2032 return; 2033 2034 if (!msb->io_queue_stopped) 2035 queue_work(msb->io_queue, &msb->io_work); 2036 } 2037 2038 static int msb_check_card(struct memstick_dev *card) 2039 { 2040 struct msb_data *msb = memstick_get_drvdata(card); 2041 return (msb->card_dead == 0); 2042 } 2043 2044 static void msb_stop(struct memstick_dev *card) 2045 { 2046 struct msb_data *msb = memstick_get_drvdata(card); 2047 unsigned long flags; 2048 2049 dbg("Stopping all msblock IO"); 2050 2051 spin_lock_irqsave(&msb->q_lock, flags); 2052 blk_stop_queue(msb->queue); 2053 msb->io_queue_stopped = true; 2054 spin_unlock_irqrestore(&msb->q_lock, flags); 2055 2056 del_timer_sync(&msb->cache_flush_timer); 2057 flush_workqueue(msb->io_queue); 2058 2059 if (msb->req) { 2060 spin_lock_irqsave(&msb->q_lock, flags); 2061 blk_requeue_request(msb->queue, msb->req); 2062 msb->req = NULL; 2063 spin_unlock_irqrestore(&msb->q_lock, flags); 2064 } 2065 2066 } 2067 2068 static void msb_start(struct memstick_dev *card) 2069 { 2070 struct msb_data *msb = memstick_get_drvdata(card); 2071 unsigned long flags; 2072 2073 dbg("Resuming IO from msblock"); 2074 2075 msb_invalidate_reg_window(msb); 2076 2077 spin_lock_irqsave(&msb->q_lock, flags); 2078 if (!msb->io_queue_stopped || msb->card_dead) { 2079 spin_unlock_irqrestore(&msb->q_lock, flags); 2080 return; 2081 } 2082 spin_unlock_irqrestore(&msb->q_lock, flags); 2083 2084 /* Kick cache flush anyway, its harmless */ 2085 msb->need_flush_cache = true; 2086 msb->io_queue_stopped = false; 2087 2088 spin_lock_irqsave(&msb->q_lock, flags); 2089 blk_start_queue(msb->queue); 2090 spin_unlock_irqrestore(&msb->q_lock, flags); 2091 2092 queue_work(msb->io_queue, &msb->io_work); 2093 2094 } 2095 2096 static const struct block_device_operations msb_bdops = { 2097 .open = msb_bd_open, 2098 .release = msb_bd_release, 2099 .getgeo = msb_bd_getgeo, 2100 .owner = THIS_MODULE 2101 }; 2102 2103 /* Registers the block device */ 2104 static int msb_init_disk(struct memstick_dev *card) 2105 { 2106 struct msb_data *msb = memstick_get_drvdata(card); 2107 struct memstick_host *host = card->host; 2108 int rc; 2109 u64 limit = BLK_BOUNCE_HIGH; 2110 unsigned long capacity; 2111 2112 if (host->dev.dma_mask && *(host->dev.dma_mask)) 2113 limit = *(host->dev.dma_mask); 2114 2115 mutex_lock(&msb_disk_lock); 2116 msb->disk_id = idr_alloc(&msb_disk_idr, card, 0, 256, GFP_KERNEL); 2117 mutex_unlock(&msb_disk_lock); 2118 2119 if (msb->disk_id < 0) 2120 return msb->disk_id; 2121 2122 msb->disk = alloc_disk(0); 2123 if (!msb->disk) { 2124 rc = -ENOMEM; 2125 goto out_release_id; 2126 } 2127 2128 msb->queue = blk_init_queue(msb_submit_req, &msb->q_lock); 2129 if (!msb->queue) { 2130 rc = -ENOMEM; 2131 goto out_put_disk; 2132 } 2133 2134 msb->queue->queuedata = card; 2135 blk_queue_prep_rq(msb->queue, msb_prepare_req); 2136 2137 blk_queue_bounce_limit(msb->queue, limit); 2138 blk_queue_max_hw_sectors(msb->queue, MS_BLOCK_MAX_PAGES); 2139 blk_queue_max_segments(msb->queue, MS_BLOCK_MAX_SEGS); 2140 blk_queue_max_segment_size(msb->queue, 2141 MS_BLOCK_MAX_PAGES * msb->page_size); 2142 blk_queue_logical_block_size(msb->queue, msb->page_size); 2143 2144 sprintf(msb->disk->disk_name, "msblk%d", msb->disk_id); 2145 msb->disk->fops = &msb_bdops; 2146 msb->disk->private_data = msb; 2147 msb->disk->queue = msb->queue; 2148 msb->disk->flags |= GENHD_FL_EXT_DEVT; 2149 2150 capacity = msb->pages_in_block * msb->logical_block_count; 2151 capacity *= (msb->page_size / 512); 2152 set_capacity(msb->disk, capacity); 2153 dbg("Set total disk size to %lu sectors", capacity); 2154 2155 msb->usage_count = 1; 2156 msb->io_queue = alloc_ordered_workqueue("ms_block", WQ_MEM_RECLAIM); 2157 INIT_WORK(&msb->io_work, msb_io_work); 2158 sg_init_table(msb->prealloc_sg, MS_BLOCK_MAX_SEGS+1); 2159 2160 if (msb->read_only) 2161 set_disk_ro(msb->disk, 1); 2162 2163 msb_start(card); 2164 device_add_disk(&card->dev, msb->disk); 2165 dbg("Disk added"); 2166 return 0; 2167 2168 out_put_disk: 2169 put_disk(msb->disk); 2170 out_release_id: 2171 mutex_lock(&msb_disk_lock); 2172 idr_remove(&msb_disk_idr, msb->disk_id); 2173 mutex_unlock(&msb_disk_lock); 2174 return rc; 2175 } 2176 2177 static int msb_probe(struct memstick_dev *card) 2178 { 2179 struct msb_data *msb; 2180 int rc = 0; 2181 2182 msb = kzalloc(sizeof(struct msb_data), GFP_KERNEL); 2183 if (!msb) 2184 return -ENOMEM; 2185 memstick_set_drvdata(card, msb); 2186 msb->card = card; 2187 spin_lock_init(&msb->q_lock); 2188 2189 rc = msb_init_card(card); 2190 if (rc) 2191 goto out_free; 2192 2193 rc = msb_init_disk(card); 2194 if (!rc) { 2195 card->check = msb_check_card; 2196 card->stop = msb_stop; 2197 card->start = msb_start; 2198 return 0; 2199 } 2200 out_free: 2201 memstick_set_drvdata(card, NULL); 2202 msb_data_clear(msb); 2203 kfree(msb); 2204 return rc; 2205 } 2206 2207 static void msb_remove(struct memstick_dev *card) 2208 { 2209 struct msb_data *msb = memstick_get_drvdata(card); 2210 unsigned long flags; 2211 2212 if (!msb->io_queue_stopped) 2213 msb_stop(card); 2214 2215 dbg("Removing the disk device"); 2216 2217 /* Take care of unhandled + new requests from now on */ 2218 spin_lock_irqsave(&msb->q_lock, flags); 2219 msb->card_dead = true; 2220 blk_start_queue(msb->queue); 2221 spin_unlock_irqrestore(&msb->q_lock, flags); 2222 2223 /* Remove the disk */ 2224 del_gendisk(msb->disk); 2225 blk_cleanup_queue(msb->queue); 2226 msb->queue = NULL; 2227 2228 mutex_lock(&msb_disk_lock); 2229 msb_data_clear(msb); 2230 mutex_unlock(&msb_disk_lock); 2231 2232 msb_disk_release(msb->disk); 2233 memstick_set_drvdata(card, NULL); 2234 } 2235 2236 #ifdef CONFIG_PM 2237 2238 static int msb_suspend(struct memstick_dev *card, pm_message_t state) 2239 { 2240 msb_stop(card); 2241 return 0; 2242 } 2243 2244 static int msb_resume(struct memstick_dev *card) 2245 { 2246 struct msb_data *msb = memstick_get_drvdata(card); 2247 struct msb_data *new_msb = NULL; 2248 bool card_dead = true; 2249 2250 #ifndef CONFIG_MEMSTICK_UNSAFE_RESUME 2251 msb->card_dead = true; 2252 return 0; 2253 #endif 2254 mutex_lock(&card->host->lock); 2255 2256 new_msb = kzalloc(sizeof(struct msb_data), GFP_KERNEL); 2257 if (!new_msb) 2258 goto out; 2259 2260 new_msb->card = card; 2261 memstick_set_drvdata(card, new_msb); 2262 spin_lock_init(&new_msb->q_lock); 2263 sg_init_table(msb->prealloc_sg, MS_BLOCK_MAX_SEGS+1); 2264 2265 if (msb_init_card(card)) 2266 goto out; 2267 2268 if (msb->block_size != new_msb->block_size) 2269 goto out; 2270 2271 if (memcmp(msb->boot_page, new_msb->boot_page, 2272 sizeof(struct ms_boot_page))) 2273 goto out; 2274 2275 if (msb->logical_block_count != new_msb->logical_block_count || 2276 memcmp(msb->lba_to_pba_table, new_msb->lba_to_pba_table, 2277 msb->logical_block_count)) 2278 goto out; 2279 2280 if (msb->block_count != new_msb->block_count || 2281 memcmp(msb->used_blocks_bitmap, new_msb->used_blocks_bitmap, 2282 msb->block_count / 8)) 2283 goto out; 2284 2285 card_dead = false; 2286 out: 2287 if (card_dead) 2288 dbg("Card was removed/replaced during suspend"); 2289 2290 msb->card_dead = card_dead; 2291 memstick_set_drvdata(card, msb); 2292 2293 if (new_msb) { 2294 msb_data_clear(new_msb); 2295 kfree(new_msb); 2296 } 2297 2298 msb_start(card); 2299 mutex_unlock(&card->host->lock); 2300 return 0; 2301 } 2302 #else 2303 2304 #define msb_suspend NULL 2305 #define msb_resume NULL 2306 2307 #endif /* CONFIG_PM */ 2308 2309 static struct memstick_device_id msb_id_tbl[] = { 2310 {MEMSTICK_MATCH_ALL, MEMSTICK_TYPE_LEGACY, MEMSTICK_CATEGORY_STORAGE, 2311 MEMSTICK_CLASS_FLASH}, 2312 2313 {MEMSTICK_MATCH_ALL, MEMSTICK_TYPE_LEGACY, MEMSTICK_CATEGORY_STORAGE, 2314 MEMSTICK_CLASS_ROM}, 2315 2316 {MEMSTICK_MATCH_ALL, MEMSTICK_TYPE_LEGACY, MEMSTICK_CATEGORY_STORAGE, 2317 MEMSTICK_CLASS_RO}, 2318 2319 {MEMSTICK_MATCH_ALL, MEMSTICK_TYPE_LEGACY, MEMSTICK_CATEGORY_STORAGE, 2320 MEMSTICK_CLASS_WP}, 2321 2322 {MEMSTICK_MATCH_ALL, MEMSTICK_TYPE_DUO, MEMSTICK_CATEGORY_STORAGE_DUO, 2323 MEMSTICK_CLASS_DUO}, 2324 {} 2325 }; 2326 MODULE_DEVICE_TABLE(memstick, msb_id_tbl); 2327 2328 2329 static struct memstick_driver msb_driver = { 2330 .driver = { 2331 .name = DRIVER_NAME, 2332 .owner = THIS_MODULE 2333 }, 2334 .id_table = msb_id_tbl, 2335 .probe = msb_probe, 2336 .remove = msb_remove, 2337 .suspend = msb_suspend, 2338 .resume = msb_resume 2339 }; 2340 2341 static int __init msb_init(void) 2342 { 2343 int rc = memstick_register_driver(&msb_driver); 2344 if (rc) 2345 pr_err("failed to register memstick driver (error %d)\n", rc); 2346 2347 return rc; 2348 } 2349 2350 static void __exit msb_exit(void) 2351 { 2352 memstick_unregister_driver(&msb_driver); 2353 idr_destroy(&msb_disk_idr); 2354 } 2355 2356 module_init(msb_init); 2357 module_exit(msb_exit); 2358 2359 module_param(cache_flush_timeout, int, S_IRUGO); 2360 MODULE_PARM_DESC(cache_flush_timeout, 2361 "Cache flush timeout in msec (1000 default)"); 2362 module_param(debug, int, S_IRUGO | S_IWUSR); 2363 MODULE_PARM_DESC(debug, "Debug level (0-2)"); 2364 2365 module_param(verify_writes, bool, S_IRUGO); 2366 MODULE_PARM_DESC(verify_writes, "Read back and check all data that is written"); 2367 2368 MODULE_LICENSE("GPL"); 2369 MODULE_AUTHOR("Maxim Levitsky"); 2370 MODULE_DESCRIPTION("Sony MemoryStick block device driver"); 2371