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_array(2, sizeof(struct ms_boot_page), 1205 GFP_KERNEL); 1206 if (!page) 1207 return -ENOMEM; 1208 1209 msb->boot_page = page; 1210 } else 1211 page = msb->boot_page; 1212 1213 msb->block_count = MS_BLOCK_MAX_BOOT_ADDR; 1214 1215 for (pba = 0; pba < MS_BLOCK_MAX_BOOT_ADDR; pba++) { 1216 1217 sg_init_one(&sg, page, sizeof(*page)); 1218 if (msb_read_page(msb, pba, 0, &extra, &sg, 0)) { 1219 dbg("boot scan: can't read pba %d", pba); 1220 continue; 1221 } 1222 1223 if (extra.management_flag & MEMSTICK_MANAGEMENT_SYSFLG) { 1224 dbg("management flag doesn't indicate boot block %d", 1225 pba); 1226 continue; 1227 } 1228 1229 if (be16_to_cpu(page->header.block_id) != MS_BLOCK_BOOT_ID) { 1230 dbg("the pba at %d doesn' contain boot block ID", pba); 1231 continue; 1232 } 1233 1234 msb_fix_boot_page_endianness(page); 1235 msb->boot_block_locations[msb->boot_block_count] = pba; 1236 1237 page++; 1238 msb->boot_block_count++; 1239 1240 if (msb->boot_block_count == 2) 1241 break; 1242 } 1243 1244 if (!msb->boot_block_count) { 1245 pr_err("media doesn't contain master page, aborting"); 1246 return -EIO; 1247 } 1248 1249 dbg_verbose("End of scan for boot blocks"); 1250 return 0; 1251 } 1252 1253 static int msb_read_bad_block_table(struct msb_data *msb, int block_nr) 1254 { 1255 struct ms_boot_page *boot_block; 1256 struct scatterlist sg; 1257 u16 *buffer = NULL; 1258 int offset = 0; 1259 int i, error = 0; 1260 int data_size, data_offset, page, page_offset, size_to_read; 1261 u16 pba; 1262 1263 BUG_ON(block_nr > 1); 1264 boot_block = &msb->boot_page[block_nr]; 1265 pba = msb->boot_block_locations[block_nr]; 1266 1267 if (msb->boot_block_locations[block_nr] == MS_BLOCK_INVALID) 1268 return -EINVAL; 1269 1270 data_size = boot_block->entry.disabled_block.data_size; 1271 data_offset = sizeof(struct ms_boot_page) + 1272 boot_block->entry.disabled_block.start_addr; 1273 if (!data_size) 1274 return 0; 1275 1276 page = data_offset / msb->page_size; 1277 page_offset = data_offset % msb->page_size; 1278 size_to_read = 1279 DIV_ROUND_UP(data_size + page_offset, msb->page_size) * 1280 msb->page_size; 1281 1282 dbg("reading bad block of boot block at pba %d, offset %d len %d", 1283 pba, data_offset, data_size); 1284 1285 buffer = kzalloc(size_to_read, GFP_KERNEL); 1286 if (!buffer) 1287 return -ENOMEM; 1288 1289 /* Read the buffer */ 1290 sg_init_one(&sg, buffer, size_to_read); 1291 1292 while (offset < size_to_read) { 1293 error = msb_read_page(msb, pba, page, NULL, &sg, offset); 1294 if (error) 1295 goto out; 1296 1297 page++; 1298 offset += msb->page_size; 1299 1300 if (page == msb->pages_in_block) { 1301 pr_err( 1302 "bad block table extends beyond the boot block"); 1303 break; 1304 } 1305 } 1306 1307 /* Process the bad block table */ 1308 for (i = page_offset; i < data_size / sizeof(u16); i++) { 1309 1310 u16 bad_block = be16_to_cpu(buffer[i]); 1311 1312 if (bad_block >= msb->block_count) { 1313 dbg("bad block table contains invalid block %d", 1314 bad_block); 1315 continue; 1316 } 1317 1318 if (test_bit(bad_block, msb->used_blocks_bitmap)) { 1319 dbg("duplicate bad block %d in the table", 1320 bad_block); 1321 continue; 1322 } 1323 1324 dbg("block %d is marked as factory bad", bad_block); 1325 msb_mark_block_used(msb, bad_block); 1326 } 1327 out: 1328 kfree(buffer); 1329 return error; 1330 } 1331 1332 static int msb_ftl_initialize(struct msb_data *msb) 1333 { 1334 int i; 1335 1336 if (msb->ftl_initialized) 1337 return 0; 1338 1339 msb->zone_count = msb->block_count / MS_BLOCKS_IN_ZONE; 1340 msb->logical_block_count = msb->zone_count * 496 - 2; 1341 1342 msb->used_blocks_bitmap = kzalloc(msb->block_count / 8, GFP_KERNEL); 1343 msb->erased_blocks_bitmap = kzalloc(msb->block_count / 8, GFP_KERNEL); 1344 msb->lba_to_pba_table = 1345 kmalloc_array(msb->logical_block_count, sizeof(u16), 1346 GFP_KERNEL); 1347 1348 if (!msb->used_blocks_bitmap || !msb->lba_to_pba_table || 1349 !msb->erased_blocks_bitmap) { 1350 kfree(msb->used_blocks_bitmap); 1351 kfree(msb->lba_to_pba_table); 1352 kfree(msb->erased_blocks_bitmap); 1353 return -ENOMEM; 1354 } 1355 1356 for (i = 0; i < msb->zone_count; i++) 1357 msb->free_block_count[i] = MS_BLOCKS_IN_ZONE; 1358 1359 memset(msb->lba_to_pba_table, MS_BLOCK_INVALID, 1360 msb->logical_block_count * sizeof(u16)); 1361 1362 dbg("initial FTL tables created. Zone count = %d, Logical block count = %d", 1363 msb->zone_count, msb->logical_block_count); 1364 1365 msb->ftl_initialized = true; 1366 return 0; 1367 } 1368 1369 static int msb_ftl_scan(struct msb_data *msb) 1370 { 1371 u16 pba, lba, other_block; 1372 u8 overwrite_flag, management_flag, other_overwrite_flag; 1373 int error; 1374 struct ms_extra_data_register extra; 1375 u8 *overwrite_flags = kzalloc(msb->block_count, GFP_KERNEL); 1376 1377 if (!overwrite_flags) 1378 return -ENOMEM; 1379 1380 dbg("Start of media scanning"); 1381 for (pba = 0; pba < msb->block_count; pba++) { 1382 1383 if (pba == msb->boot_block_locations[0] || 1384 pba == msb->boot_block_locations[1]) { 1385 dbg_verbose("pba %05d -> [boot block]", pba); 1386 msb_mark_block_used(msb, pba); 1387 continue; 1388 } 1389 1390 if (test_bit(pba, msb->used_blocks_bitmap)) { 1391 dbg_verbose("pba %05d -> [factory bad]", pba); 1392 continue; 1393 } 1394 1395 memset(&extra, 0, sizeof(extra)); 1396 error = msb_read_oob(msb, pba, 0, &extra); 1397 1398 /* can't trust the page if we can't read the oob */ 1399 if (error == -EBADMSG) { 1400 pr_notice( 1401 "oob of pba %d damaged, will try to erase it", pba); 1402 msb_mark_block_used(msb, pba); 1403 msb_erase_block(msb, pba); 1404 continue; 1405 } else if (error) { 1406 pr_err("unknown error %d on read of oob of pba %d - aborting", 1407 error, pba); 1408 1409 kfree(overwrite_flags); 1410 return error; 1411 } 1412 1413 lba = be16_to_cpu(extra.logical_address); 1414 management_flag = extra.management_flag; 1415 overwrite_flag = extra.overwrite_flag; 1416 overwrite_flags[pba] = overwrite_flag; 1417 1418 /* Skip bad blocks */ 1419 if (!(overwrite_flag & MEMSTICK_OVERWRITE_BKST)) { 1420 dbg("pba %05d -> [BAD]", pba); 1421 msb_mark_block_used(msb, pba); 1422 continue; 1423 } 1424 1425 /* Skip system/drm blocks */ 1426 if ((management_flag & MEMSTICK_MANAGEMENT_FLAG_NORMAL) != 1427 MEMSTICK_MANAGEMENT_FLAG_NORMAL) { 1428 dbg("pba %05d -> [reserved management flag %02x]", 1429 pba, management_flag); 1430 msb_mark_block_used(msb, pba); 1431 continue; 1432 } 1433 1434 /* Erase temporary tables */ 1435 if (!(management_flag & MEMSTICK_MANAGEMENT_ATFLG)) { 1436 dbg("pba %05d -> [temp table] - will erase", pba); 1437 1438 msb_mark_block_used(msb, pba); 1439 msb_erase_block(msb, pba); 1440 continue; 1441 } 1442 1443 if (lba == MS_BLOCK_INVALID) { 1444 dbg_verbose("pba %05d -> [free]", pba); 1445 continue; 1446 } 1447 1448 msb_mark_block_used(msb, pba); 1449 1450 /* Block has LBA not according to zoning*/ 1451 if (msb_get_zone_from_lba(lba) != msb_get_zone_from_pba(pba)) { 1452 pr_notice("pba %05d -> [bad lba %05d] - will erase", 1453 pba, lba); 1454 msb_erase_block(msb, pba); 1455 continue; 1456 } 1457 1458 /* No collisions - great */ 1459 if (msb->lba_to_pba_table[lba] == MS_BLOCK_INVALID) { 1460 dbg_verbose("pba %05d -> [lba %05d]", pba, lba); 1461 msb->lba_to_pba_table[lba] = pba; 1462 continue; 1463 } 1464 1465 other_block = msb->lba_to_pba_table[lba]; 1466 other_overwrite_flag = overwrite_flags[other_block]; 1467 1468 pr_notice("Collision between pba %d and pba %d", 1469 pba, other_block); 1470 1471 if (!(overwrite_flag & MEMSTICK_OVERWRITE_UDST)) { 1472 pr_notice("pba %d is marked as stable, use it", pba); 1473 msb_erase_block(msb, other_block); 1474 msb->lba_to_pba_table[lba] = pba; 1475 continue; 1476 } 1477 1478 if (!(other_overwrite_flag & MEMSTICK_OVERWRITE_UDST)) { 1479 pr_notice("pba %d is marked as stable, use it", 1480 other_block); 1481 msb_erase_block(msb, pba); 1482 continue; 1483 } 1484 1485 pr_notice("collision between blocks %d and %d, without stable flag set on both, erasing pba %d", 1486 pba, other_block, other_block); 1487 1488 msb_erase_block(msb, other_block); 1489 msb->lba_to_pba_table[lba] = pba; 1490 } 1491 1492 dbg("End of media scanning"); 1493 kfree(overwrite_flags); 1494 return 0; 1495 } 1496 1497 static void msb_cache_flush_timer(struct timer_list *t) 1498 { 1499 struct msb_data *msb = from_timer(msb, t, cache_flush_timer); 1500 msb->need_flush_cache = true; 1501 queue_work(msb->io_queue, &msb->io_work); 1502 } 1503 1504 1505 static void msb_cache_discard(struct msb_data *msb) 1506 { 1507 if (msb->cache_block_lba == MS_BLOCK_INVALID) 1508 return; 1509 1510 del_timer_sync(&msb->cache_flush_timer); 1511 1512 dbg_verbose("Discarding the write cache"); 1513 msb->cache_block_lba = MS_BLOCK_INVALID; 1514 bitmap_zero(&msb->valid_cache_bitmap, msb->pages_in_block); 1515 } 1516 1517 static int msb_cache_init(struct msb_data *msb) 1518 { 1519 timer_setup(&msb->cache_flush_timer, msb_cache_flush_timer, 0); 1520 1521 if (!msb->cache) 1522 msb->cache = kzalloc(msb->block_size, GFP_KERNEL); 1523 if (!msb->cache) 1524 return -ENOMEM; 1525 1526 msb_cache_discard(msb); 1527 return 0; 1528 } 1529 1530 static int msb_cache_flush(struct msb_data *msb) 1531 { 1532 struct scatterlist sg; 1533 struct ms_extra_data_register extra; 1534 int page, offset, error; 1535 u16 pba, lba; 1536 1537 if (msb->read_only) 1538 return -EROFS; 1539 1540 if (msb->cache_block_lba == MS_BLOCK_INVALID) 1541 return 0; 1542 1543 lba = msb->cache_block_lba; 1544 pba = msb->lba_to_pba_table[lba]; 1545 1546 dbg_verbose("Flushing the write cache of pba %d (LBA %d)", 1547 pba, msb->cache_block_lba); 1548 1549 sg_init_one(&sg, msb->cache , msb->block_size); 1550 1551 /* Read all missing pages in cache */ 1552 for (page = 0; page < msb->pages_in_block; page++) { 1553 1554 if (test_bit(page, &msb->valid_cache_bitmap)) 1555 continue; 1556 1557 offset = page * msb->page_size; 1558 1559 dbg_verbose("reading non-present sector %d of cache block %d", 1560 page, lba); 1561 error = msb_read_page(msb, pba, page, &extra, &sg, offset); 1562 1563 /* Bad pages are copied with 00 page status */ 1564 if (error == -EBADMSG) { 1565 pr_err("read error on sector %d, contents probably damaged", page); 1566 continue; 1567 } 1568 1569 if (error) 1570 return error; 1571 1572 if ((extra.overwrite_flag & MEMSTICK_OV_PG_NORMAL) != 1573 MEMSTICK_OV_PG_NORMAL) { 1574 dbg("page %d is marked as bad", page); 1575 continue; 1576 } 1577 1578 set_bit(page, &msb->valid_cache_bitmap); 1579 } 1580 1581 /* Write the cache now */ 1582 error = msb_update_block(msb, msb->cache_block_lba, &sg, 0); 1583 pba = msb->lba_to_pba_table[msb->cache_block_lba]; 1584 1585 /* Mark invalid pages */ 1586 if (!error) { 1587 for (page = 0; page < msb->pages_in_block; page++) { 1588 1589 if (test_bit(page, &msb->valid_cache_bitmap)) 1590 continue; 1591 1592 dbg("marking page %d as containing damaged data", 1593 page); 1594 msb_set_overwrite_flag(msb, 1595 pba , page, 0xFF & ~MEMSTICK_OV_PG_NORMAL); 1596 } 1597 } 1598 1599 msb_cache_discard(msb); 1600 return error; 1601 } 1602 1603 static int msb_cache_write(struct msb_data *msb, int lba, 1604 int page, bool add_to_cache_only, struct scatterlist *sg, int offset) 1605 { 1606 int error; 1607 struct scatterlist sg_tmp[10]; 1608 1609 if (msb->read_only) 1610 return -EROFS; 1611 1612 if (msb->cache_block_lba == MS_BLOCK_INVALID || 1613 lba != msb->cache_block_lba) 1614 if (add_to_cache_only) 1615 return 0; 1616 1617 /* If we need to write different block */ 1618 if (msb->cache_block_lba != MS_BLOCK_INVALID && 1619 lba != msb->cache_block_lba) { 1620 dbg_verbose("first flush the cache"); 1621 error = msb_cache_flush(msb); 1622 if (error) 1623 return error; 1624 } 1625 1626 if (msb->cache_block_lba == MS_BLOCK_INVALID) { 1627 msb->cache_block_lba = lba; 1628 mod_timer(&msb->cache_flush_timer, 1629 jiffies + msecs_to_jiffies(cache_flush_timeout)); 1630 } 1631 1632 dbg_verbose("Write of LBA %d page %d to cache ", lba, page); 1633 1634 sg_init_table(sg_tmp, ARRAY_SIZE(sg_tmp)); 1635 msb_sg_copy(sg, sg_tmp, ARRAY_SIZE(sg_tmp), offset, msb->page_size); 1636 1637 sg_copy_to_buffer(sg_tmp, sg_nents(sg_tmp), 1638 msb->cache + page * msb->page_size, msb->page_size); 1639 1640 set_bit(page, &msb->valid_cache_bitmap); 1641 return 0; 1642 } 1643 1644 static int msb_cache_read(struct msb_data *msb, int lba, 1645 int page, struct scatterlist *sg, int offset) 1646 { 1647 int pba = msb->lba_to_pba_table[lba]; 1648 struct scatterlist sg_tmp[10]; 1649 int error = 0; 1650 1651 if (lba == msb->cache_block_lba && 1652 test_bit(page, &msb->valid_cache_bitmap)) { 1653 1654 dbg_verbose("Read of LBA %d (pba %d) sector %d from cache", 1655 lba, pba, page); 1656 1657 sg_init_table(sg_tmp, ARRAY_SIZE(sg_tmp)); 1658 msb_sg_copy(sg, sg_tmp, ARRAY_SIZE(sg_tmp), 1659 offset, msb->page_size); 1660 sg_copy_from_buffer(sg_tmp, sg_nents(sg_tmp), 1661 msb->cache + msb->page_size * page, 1662 msb->page_size); 1663 } else { 1664 dbg_verbose("Read of LBA %d (pba %d) sector %d from device", 1665 lba, pba, page); 1666 1667 error = msb_read_page(msb, pba, page, NULL, sg, offset); 1668 if (error) 1669 return error; 1670 1671 msb_cache_write(msb, lba, page, true, sg, offset); 1672 } 1673 return error; 1674 } 1675 1676 /* Emulated geometry table 1677 * This table content isn't that importaint, 1678 * One could put here different values, providing that they still 1679 * cover whole disk. 1680 * 64 MB entry is what windows reports for my 64M memstick */ 1681 1682 static const struct chs_entry chs_table[] = { 1683 /* size sectors cylynders heads */ 1684 { 4, 16, 247, 2 }, 1685 { 8, 16, 495, 2 }, 1686 { 16, 16, 495, 4 }, 1687 { 32, 16, 991, 4 }, 1688 { 64, 16, 991, 8 }, 1689 {128, 16, 991, 16 }, 1690 { 0 } 1691 }; 1692 1693 /* Load information about the card */ 1694 static int msb_init_card(struct memstick_dev *card) 1695 { 1696 struct msb_data *msb = memstick_get_drvdata(card); 1697 struct memstick_host *host = card->host; 1698 struct ms_boot_page *boot_block; 1699 int error = 0, i, raw_size_in_megs; 1700 1701 msb->caps = 0; 1702 1703 if (card->id.class >= MEMSTICK_CLASS_ROM && 1704 card->id.class <= MEMSTICK_CLASS_ROM) 1705 msb->read_only = true; 1706 1707 msb->state = -1; 1708 error = msb_reset(msb, false); 1709 if (error) 1710 return error; 1711 1712 /* Due to a bug in Jmicron driver written by Alex Dubov, 1713 its serial mode barely works, 1714 so we switch to parallel mode right away */ 1715 if (host->caps & MEMSTICK_CAP_PAR4) 1716 msb_switch_to_parallel(msb); 1717 1718 msb->page_size = sizeof(struct ms_boot_page); 1719 1720 /* Read the boot page */ 1721 error = msb_read_boot_blocks(msb); 1722 if (error) 1723 return -EIO; 1724 1725 boot_block = &msb->boot_page[0]; 1726 1727 /* Save intersting attributes from boot page */ 1728 msb->block_count = boot_block->attr.number_of_blocks; 1729 msb->page_size = boot_block->attr.page_size; 1730 1731 msb->pages_in_block = boot_block->attr.block_size * 2; 1732 msb->block_size = msb->page_size * msb->pages_in_block; 1733 1734 if (msb->page_size > PAGE_SIZE) { 1735 /* this isn't supported by linux at all, anyway*/ 1736 dbg("device page %d size isn't supported", msb->page_size); 1737 return -EINVAL; 1738 } 1739 1740 msb->block_buffer = kzalloc(msb->block_size, GFP_KERNEL); 1741 if (!msb->block_buffer) 1742 return -ENOMEM; 1743 1744 raw_size_in_megs = (msb->block_size * msb->block_count) >> 20; 1745 1746 for (i = 0; chs_table[i].size; i++) { 1747 1748 if (chs_table[i].size != raw_size_in_megs) 1749 continue; 1750 1751 msb->geometry.cylinders = chs_table[i].cyl; 1752 msb->geometry.heads = chs_table[i].head; 1753 msb->geometry.sectors = chs_table[i].sec; 1754 break; 1755 } 1756 1757 if (boot_block->attr.transfer_supporting == 1) 1758 msb->caps |= MEMSTICK_CAP_PAR4; 1759 1760 if (boot_block->attr.device_type & 0x03) 1761 msb->read_only = true; 1762 1763 dbg("Total block count = %d", msb->block_count); 1764 dbg("Each block consists of %d pages", msb->pages_in_block); 1765 dbg("Page size = %d bytes", msb->page_size); 1766 dbg("Parallel mode supported: %d", !!(msb->caps & MEMSTICK_CAP_PAR4)); 1767 dbg("Read only: %d", msb->read_only); 1768 1769 #if 0 1770 /* Now we can switch the interface */ 1771 if (host->caps & msb->caps & MEMSTICK_CAP_PAR4) 1772 msb_switch_to_parallel(msb); 1773 #endif 1774 1775 error = msb_cache_init(msb); 1776 if (error) 1777 return error; 1778 1779 error = msb_ftl_initialize(msb); 1780 if (error) 1781 return error; 1782 1783 1784 /* Read the bad block table */ 1785 error = msb_read_bad_block_table(msb, 0); 1786 1787 if (error && error != -ENOMEM) { 1788 dbg("failed to read bad block table from primary boot block, trying from backup"); 1789 error = msb_read_bad_block_table(msb, 1); 1790 } 1791 1792 if (error) 1793 return error; 1794 1795 /* *drum roll* Scan the media */ 1796 error = msb_ftl_scan(msb); 1797 if (error) { 1798 pr_err("Scan of media failed"); 1799 return error; 1800 } 1801 1802 return 0; 1803 1804 } 1805 1806 static int msb_do_write_request(struct msb_data *msb, int lba, 1807 int page, struct scatterlist *sg, size_t len, int *sucessfuly_written) 1808 { 1809 int error = 0; 1810 off_t offset = 0; 1811 *sucessfuly_written = 0; 1812 1813 while (offset < len) { 1814 if (page == 0 && len - offset >= msb->block_size) { 1815 1816 if (msb->cache_block_lba == lba) 1817 msb_cache_discard(msb); 1818 1819 dbg_verbose("Writing whole lba %d", lba); 1820 error = msb_update_block(msb, lba, sg, offset); 1821 if (error) 1822 return error; 1823 1824 offset += msb->block_size; 1825 *sucessfuly_written += msb->block_size; 1826 lba++; 1827 continue; 1828 } 1829 1830 error = msb_cache_write(msb, lba, page, false, sg, offset); 1831 if (error) 1832 return error; 1833 1834 offset += msb->page_size; 1835 *sucessfuly_written += msb->page_size; 1836 1837 page++; 1838 if (page == msb->pages_in_block) { 1839 page = 0; 1840 lba++; 1841 } 1842 } 1843 return 0; 1844 } 1845 1846 static int msb_do_read_request(struct msb_data *msb, int lba, 1847 int page, struct scatterlist *sg, int len, int *sucessfuly_read) 1848 { 1849 int error = 0; 1850 int offset = 0; 1851 *sucessfuly_read = 0; 1852 1853 while (offset < len) { 1854 1855 error = msb_cache_read(msb, lba, page, sg, offset); 1856 if (error) 1857 return error; 1858 1859 offset += msb->page_size; 1860 *sucessfuly_read += msb->page_size; 1861 1862 page++; 1863 if (page == msb->pages_in_block) { 1864 page = 0; 1865 lba++; 1866 } 1867 } 1868 return 0; 1869 } 1870 1871 static void msb_io_work(struct work_struct *work) 1872 { 1873 struct msb_data *msb = container_of(work, struct msb_data, io_work); 1874 int page, error, len; 1875 sector_t lba; 1876 unsigned long flags; 1877 struct scatterlist *sg = msb->prealloc_sg; 1878 1879 dbg_verbose("IO: work started"); 1880 1881 while (1) { 1882 spin_lock_irqsave(&msb->q_lock, flags); 1883 1884 if (msb->need_flush_cache) { 1885 msb->need_flush_cache = false; 1886 spin_unlock_irqrestore(&msb->q_lock, flags); 1887 msb_cache_flush(msb); 1888 continue; 1889 } 1890 1891 if (!msb->req) { 1892 msb->req = blk_fetch_request(msb->queue); 1893 if (!msb->req) { 1894 dbg_verbose("IO: no more requests exiting"); 1895 spin_unlock_irqrestore(&msb->q_lock, flags); 1896 return; 1897 } 1898 } 1899 1900 spin_unlock_irqrestore(&msb->q_lock, flags); 1901 1902 /* If card was removed meanwhile */ 1903 if (!msb->req) 1904 return; 1905 1906 /* process the request */ 1907 dbg_verbose("IO: processing new request"); 1908 blk_rq_map_sg(msb->queue, msb->req, sg); 1909 1910 lba = blk_rq_pos(msb->req); 1911 1912 sector_div(lba, msb->page_size / 512); 1913 page = sector_div(lba, msb->pages_in_block); 1914 1915 if (rq_data_dir(msb->req) == READ) 1916 error = msb_do_read_request(msb, lba, page, sg, 1917 blk_rq_bytes(msb->req), &len); 1918 else 1919 error = msb_do_write_request(msb, lba, page, sg, 1920 blk_rq_bytes(msb->req), &len); 1921 1922 spin_lock_irqsave(&msb->q_lock, flags); 1923 1924 if (len) 1925 if (!__blk_end_request(msb->req, BLK_STS_OK, len)) 1926 msb->req = NULL; 1927 1928 if (error && msb->req) { 1929 blk_status_t ret = errno_to_blk_status(error); 1930 dbg_verbose("IO: ending one sector of the request with error"); 1931 if (!__blk_end_request(msb->req, ret, msb->page_size)) 1932 msb->req = NULL; 1933 } 1934 1935 if (msb->req) 1936 dbg_verbose("IO: request still pending"); 1937 1938 spin_unlock_irqrestore(&msb->q_lock, flags); 1939 } 1940 } 1941 1942 static DEFINE_IDR(msb_disk_idr); /*set of used disk numbers */ 1943 static DEFINE_MUTEX(msb_disk_lock); /* protects against races in open/release */ 1944 1945 static int msb_bd_open(struct block_device *bdev, fmode_t mode) 1946 { 1947 struct gendisk *disk = bdev->bd_disk; 1948 struct msb_data *msb = disk->private_data; 1949 1950 dbg_verbose("block device open"); 1951 1952 mutex_lock(&msb_disk_lock); 1953 1954 if (msb && msb->card) 1955 msb->usage_count++; 1956 1957 mutex_unlock(&msb_disk_lock); 1958 return 0; 1959 } 1960 1961 static void msb_data_clear(struct msb_data *msb) 1962 { 1963 kfree(msb->boot_page); 1964 kfree(msb->used_blocks_bitmap); 1965 kfree(msb->lba_to_pba_table); 1966 kfree(msb->cache); 1967 msb->card = NULL; 1968 } 1969 1970 static int msb_disk_release(struct gendisk *disk) 1971 { 1972 struct msb_data *msb = disk->private_data; 1973 1974 dbg_verbose("block device release"); 1975 mutex_lock(&msb_disk_lock); 1976 1977 if (msb) { 1978 if (msb->usage_count) 1979 msb->usage_count--; 1980 1981 if (!msb->usage_count) { 1982 disk->private_data = NULL; 1983 idr_remove(&msb_disk_idr, msb->disk_id); 1984 put_disk(disk); 1985 kfree(msb); 1986 } 1987 } 1988 mutex_unlock(&msb_disk_lock); 1989 return 0; 1990 } 1991 1992 static void msb_bd_release(struct gendisk *disk, fmode_t mode) 1993 { 1994 msb_disk_release(disk); 1995 } 1996 1997 static int msb_bd_getgeo(struct block_device *bdev, 1998 struct hd_geometry *geo) 1999 { 2000 struct msb_data *msb = bdev->bd_disk->private_data; 2001 *geo = msb->geometry; 2002 return 0; 2003 } 2004 2005 static void msb_submit_req(struct request_queue *q) 2006 { 2007 struct memstick_dev *card = q->queuedata; 2008 struct msb_data *msb = memstick_get_drvdata(card); 2009 struct request *req = NULL; 2010 2011 dbg_verbose("Submit request"); 2012 2013 if (msb->card_dead) { 2014 dbg("Refusing requests on removed card"); 2015 2016 WARN_ON(!msb->io_queue_stopped); 2017 2018 while ((req = blk_fetch_request(q)) != NULL) 2019 __blk_end_request_all(req, BLK_STS_IOERR); 2020 return; 2021 } 2022 2023 if (msb->req) 2024 return; 2025 2026 if (!msb->io_queue_stopped) 2027 queue_work(msb->io_queue, &msb->io_work); 2028 } 2029 2030 static int msb_check_card(struct memstick_dev *card) 2031 { 2032 struct msb_data *msb = memstick_get_drvdata(card); 2033 return (msb->card_dead == 0); 2034 } 2035 2036 static void msb_stop(struct memstick_dev *card) 2037 { 2038 struct msb_data *msb = memstick_get_drvdata(card); 2039 unsigned long flags; 2040 2041 dbg("Stopping all msblock IO"); 2042 2043 spin_lock_irqsave(&msb->q_lock, flags); 2044 blk_stop_queue(msb->queue); 2045 msb->io_queue_stopped = true; 2046 spin_unlock_irqrestore(&msb->q_lock, flags); 2047 2048 del_timer_sync(&msb->cache_flush_timer); 2049 flush_workqueue(msb->io_queue); 2050 2051 if (msb->req) { 2052 spin_lock_irqsave(&msb->q_lock, flags); 2053 blk_requeue_request(msb->queue, msb->req); 2054 msb->req = NULL; 2055 spin_unlock_irqrestore(&msb->q_lock, flags); 2056 } 2057 2058 } 2059 2060 static void msb_start(struct memstick_dev *card) 2061 { 2062 struct msb_data *msb = memstick_get_drvdata(card); 2063 unsigned long flags; 2064 2065 dbg("Resuming IO from msblock"); 2066 2067 msb_invalidate_reg_window(msb); 2068 2069 spin_lock_irqsave(&msb->q_lock, flags); 2070 if (!msb->io_queue_stopped || msb->card_dead) { 2071 spin_unlock_irqrestore(&msb->q_lock, flags); 2072 return; 2073 } 2074 spin_unlock_irqrestore(&msb->q_lock, flags); 2075 2076 /* Kick cache flush anyway, its harmless */ 2077 msb->need_flush_cache = true; 2078 msb->io_queue_stopped = false; 2079 2080 spin_lock_irqsave(&msb->q_lock, flags); 2081 blk_start_queue(msb->queue); 2082 spin_unlock_irqrestore(&msb->q_lock, flags); 2083 2084 queue_work(msb->io_queue, &msb->io_work); 2085 2086 } 2087 2088 static const struct block_device_operations msb_bdops = { 2089 .open = msb_bd_open, 2090 .release = msb_bd_release, 2091 .getgeo = msb_bd_getgeo, 2092 .owner = THIS_MODULE 2093 }; 2094 2095 /* Registers the block device */ 2096 static int msb_init_disk(struct memstick_dev *card) 2097 { 2098 struct msb_data *msb = memstick_get_drvdata(card); 2099 int rc; 2100 unsigned long capacity; 2101 2102 mutex_lock(&msb_disk_lock); 2103 msb->disk_id = idr_alloc(&msb_disk_idr, card, 0, 256, GFP_KERNEL); 2104 mutex_unlock(&msb_disk_lock); 2105 2106 if (msb->disk_id < 0) 2107 return msb->disk_id; 2108 2109 msb->disk = alloc_disk(0); 2110 if (!msb->disk) { 2111 rc = -ENOMEM; 2112 goto out_release_id; 2113 } 2114 2115 msb->queue = blk_init_queue(msb_submit_req, &msb->q_lock); 2116 if (!msb->queue) { 2117 rc = -ENOMEM; 2118 goto out_put_disk; 2119 } 2120 2121 msb->queue->queuedata = card; 2122 2123 blk_queue_max_hw_sectors(msb->queue, MS_BLOCK_MAX_PAGES); 2124 blk_queue_max_segments(msb->queue, MS_BLOCK_MAX_SEGS); 2125 blk_queue_max_segment_size(msb->queue, 2126 MS_BLOCK_MAX_PAGES * msb->page_size); 2127 blk_queue_logical_block_size(msb->queue, msb->page_size); 2128 2129 sprintf(msb->disk->disk_name, "msblk%d", msb->disk_id); 2130 msb->disk->fops = &msb_bdops; 2131 msb->disk->private_data = msb; 2132 msb->disk->queue = msb->queue; 2133 msb->disk->flags |= GENHD_FL_EXT_DEVT; 2134 2135 capacity = msb->pages_in_block * msb->logical_block_count; 2136 capacity *= (msb->page_size / 512); 2137 set_capacity(msb->disk, capacity); 2138 dbg("Set total disk size to %lu sectors", capacity); 2139 2140 msb->usage_count = 1; 2141 msb->io_queue = alloc_ordered_workqueue("ms_block", WQ_MEM_RECLAIM); 2142 INIT_WORK(&msb->io_work, msb_io_work); 2143 sg_init_table(msb->prealloc_sg, MS_BLOCK_MAX_SEGS+1); 2144 2145 if (msb->read_only) 2146 set_disk_ro(msb->disk, 1); 2147 2148 msb_start(card); 2149 device_add_disk(&card->dev, msb->disk); 2150 dbg("Disk added"); 2151 return 0; 2152 2153 out_put_disk: 2154 put_disk(msb->disk); 2155 out_release_id: 2156 mutex_lock(&msb_disk_lock); 2157 idr_remove(&msb_disk_idr, msb->disk_id); 2158 mutex_unlock(&msb_disk_lock); 2159 return rc; 2160 } 2161 2162 static int msb_probe(struct memstick_dev *card) 2163 { 2164 struct msb_data *msb; 2165 int rc = 0; 2166 2167 msb = kzalloc(sizeof(struct msb_data), GFP_KERNEL); 2168 if (!msb) 2169 return -ENOMEM; 2170 memstick_set_drvdata(card, msb); 2171 msb->card = card; 2172 spin_lock_init(&msb->q_lock); 2173 2174 rc = msb_init_card(card); 2175 if (rc) 2176 goto out_free; 2177 2178 rc = msb_init_disk(card); 2179 if (!rc) { 2180 card->check = msb_check_card; 2181 card->stop = msb_stop; 2182 card->start = msb_start; 2183 return 0; 2184 } 2185 out_free: 2186 memstick_set_drvdata(card, NULL); 2187 msb_data_clear(msb); 2188 kfree(msb); 2189 return rc; 2190 } 2191 2192 static void msb_remove(struct memstick_dev *card) 2193 { 2194 struct msb_data *msb = memstick_get_drvdata(card); 2195 unsigned long flags; 2196 2197 if (!msb->io_queue_stopped) 2198 msb_stop(card); 2199 2200 dbg("Removing the disk device"); 2201 2202 /* Take care of unhandled + new requests from now on */ 2203 spin_lock_irqsave(&msb->q_lock, flags); 2204 msb->card_dead = true; 2205 blk_start_queue(msb->queue); 2206 spin_unlock_irqrestore(&msb->q_lock, flags); 2207 2208 /* Remove the disk */ 2209 del_gendisk(msb->disk); 2210 blk_cleanup_queue(msb->queue); 2211 msb->queue = NULL; 2212 2213 mutex_lock(&msb_disk_lock); 2214 msb_data_clear(msb); 2215 mutex_unlock(&msb_disk_lock); 2216 2217 msb_disk_release(msb->disk); 2218 memstick_set_drvdata(card, NULL); 2219 } 2220 2221 #ifdef CONFIG_PM 2222 2223 static int msb_suspend(struct memstick_dev *card, pm_message_t state) 2224 { 2225 msb_stop(card); 2226 return 0; 2227 } 2228 2229 static int msb_resume(struct memstick_dev *card) 2230 { 2231 struct msb_data *msb = memstick_get_drvdata(card); 2232 struct msb_data *new_msb = NULL; 2233 bool card_dead = true; 2234 2235 #ifndef CONFIG_MEMSTICK_UNSAFE_RESUME 2236 msb->card_dead = true; 2237 return 0; 2238 #endif 2239 mutex_lock(&card->host->lock); 2240 2241 new_msb = kzalloc(sizeof(struct msb_data), GFP_KERNEL); 2242 if (!new_msb) 2243 goto out; 2244 2245 new_msb->card = card; 2246 memstick_set_drvdata(card, new_msb); 2247 spin_lock_init(&new_msb->q_lock); 2248 sg_init_table(msb->prealloc_sg, MS_BLOCK_MAX_SEGS+1); 2249 2250 if (msb_init_card(card)) 2251 goto out; 2252 2253 if (msb->block_size != new_msb->block_size) 2254 goto out; 2255 2256 if (memcmp(msb->boot_page, new_msb->boot_page, 2257 sizeof(struct ms_boot_page))) 2258 goto out; 2259 2260 if (msb->logical_block_count != new_msb->logical_block_count || 2261 memcmp(msb->lba_to_pba_table, new_msb->lba_to_pba_table, 2262 msb->logical_block_count)) 2263 goto out; 2264 2265 if (msb->block_count != new_msb->block_count || 2266 memcmp(msb->used_blocks_bitmap, new_msb->used_blocks_bitmap, 2267 msb->block_count / 8)) 2268 goto out; 2269 2270 card_dead = false; 2271 out: 2272 if (card_dead) 2273 dbg("Card was removed/replaced during suspend"); 2274 2275 msb->card_dead = card_dead; 2276 memstick_set_drvdata(card, msb); 2277 2278 if (new_msb) { 2279 msb_data_clear(new_msb); 2280 kfree(new_msb); 2281 } 2282 2283 msb_start(card); 2284 mutex_unlock(&card->host->lock); 2285 return 0; 2286 } 2287 #else 2288 2289 #define msb_suspend NULL 2290 #define msb_resume NULL 2291 2292 #endif /* CONFIG_PM */ 2293 2294 static struct memstick_device_id msb_id_tbl[] = { 2295 {MEMSTICK_MATCH_ALL, MEMSTICK_TYPE_LEGACY, MEMSTICK_CATEGORY_STORAGE, 2296 MEMSTICK_CLASS_FLASH}, 2297 2298 {MEMSTICK_MATCH_ALL, MEMSTICK_TYPE_LEGACY, MEMSTICK_CATEGORY_STORAGE, 2299 MEMSTICK_CLASS_ROM}, 2300 2301 {MEMSTICK_MATCH_ALL, MEMSTICK_TYPE_LEGACY, MEMSTICK_CATEGORY_STORAGE, 2302 MEMSTICK_CLASS_RO}, 2303 2304 {MEMSTICK_MATCH_ALL, MEMSTICK_TYPE_LEGACY, MEMSTICK_CATEGORY_STORAGE, 2305 MEMSTICK_CLASS_WP}, 2306 2307 {MEMSTICK_MATCH_ALL, MEMSTICK_TYPE_DUO, MEMSTICK_CATEGORY_STORAGE_DUO, 2308 MEMSTICK_CLASS_DUO}, 2309 {} 2310 }; 2311 MODULE_DEVICE_TABLE(memstick, msb_id_tbl); 2312 2313 2314 static struct memstick_driver msb_driver = { 2315 .driver = { 2316 .name = DRIVER_NAME, 2317 .owner = THIS_MODULE 2318 }, 2319 .id_table = msb_id_tbl, 2320 .probe = msb_probe, 2321 .remove = msb_remove, 2322 .suspend = msb_suspend, 2323 .resume = msb_resume 2324 }; 2325 2326 static int __init msb_init(void) 2327 { 2328 int rc = memstick_register_driver(&msb_driver); 2329 if (rc) 2330 pr_err("failed to register memstick driver (error %d)\n", rc); 2331 2332 return rc; 2333 } 2334 2335 static void __exit msb_exit(void) 2336 { 2337 memstick_unregister_driver(&msb_driver); 2338 idr_destroy(&msb_disk_idr); 2339 } 2340 2341 module_init(msb_init); 2342 module_exit(msb_exit); 2343 2344 module_param(cache_flush_timeout, int, S_IRUGO); 2345 MODULE_PARM_DESC(cache_flush_timeout, 2346 "Cache flush timeout in msec (1000 default)"); 2347 module_param(debug, int, S_IRUGO | S_IWUSR); 2348 MODULE_PARM_DESC(debug, "Debug level (0-2)"); 2349 2350 module_param(verify_writes, bool, S_IRUGO); 2351 MODULE_PARM_DESC(verify_writes, "Read back and check all data that is written"); 2352 2353 MODULE_LICENSE("GPL"); 2354 MODULE_AUTHOR("Maxim Levitsky"); 2355 MODULE_DESCRIPTION("Sony MemoryStick block device driver"); 2356