Maxim Levitsky | 0ab3049 | 2013-09-11 14:26:02 -0700 | [diff] [blame] | 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_OOB_READ; |
| 405 | return 0; |
| 406 | |
| 407 | case MSB_RP_RECIVE_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("managment 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, managment_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 | managment_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 ((managment_flag & MEMSTICK_MANAGMENT_FLAG_NORMAL) != |
| 1425 | MEMSTICK_MANAGMENT_FLAG_NORMAL) { |
| 1426 | dbg("pba %05d -> [reserved managment flag %02x]", |
| 1427 | pba, managment_flag); |
| 1428 | msb_mark_block_used(msb, pba); |
| 1429 | continue; |
| 1430 | } |
| 1431 | |
| 1432 | /* Erase temporary tables */ |
| 1433 | if (!(managment_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 = do_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 | req->cmd_type != REQ_TYPE_BLOCK_PC) { |
| 2007 | blk_dump_rq_flags(req, "MS unsupported request"); |
| 2008 | return BLKPREP_KILL; |
| 2009 | } |
| 2010 | req->cmd_flags |= REQ_DONTPREP; |
| 2011 | return BLKPREP_OK; |
| 2012 | } |
| 2013 | |
| 2014 | static void msb_submit_req(struct request_queue *q) |
| 2015 | { |
| 2016 | struct memstick_dev *card = q->queuedata; |
| 2017 | struct msb_data *msb = memstick_get_drvdata(card); |
| 2018 | struct request *req = NULL; |
| 2019 | |
| 2020 | dbg_verbose("Submit request"); |
| 2021 | |
| 2022 | if (msb->card_dead) { |
| 2023 | dbg("Refusing requests on removed card"); |
| 2024 | |
| 2025 | WARN_ON(!msb->io_queue_stopped); |
| 2026 | |
| 2027 | while ((req = blk_fetch_request(q)) != NULL) |
| 2028 | __blk_end_request_all(req, -ENODEV); |
| 2029 | return; |
| 2030 | } |
| 2031 | |
| 2032 | if (msb->req) |
| 2033 | return; |
| 2034 | |
| 2035 | if (!msb->io_queue_stopped) |
| 2036 | queue_work(msb->io_queue, &msb->io_work); |
| 2037 | } |
| 2038 | |
| 2039 | static int msb_check_card(struct memstick_dev *card) |
| 2040 | { |
| 2041 | struct msb_data *msb = memstick_get_drvdata(card); |
| 2042 | return (msb->card_dead == 0); |
| 2043 | } |
| 2044 | |
| 2045 | static void msb_stop(struct memstick_dev *card) |
| 2046 | { |
| 2047 | struct msb_data *msb = memstick_get_drvdata(card); |
| 2048 | unsigned long flags; |
| 2049 | |
| 2050 | dbg("Stopping all msblock IO"); |
| 2051 | |
| 2052 | spin_lock_irqsave(&msb->q_lock, flags); |
| 2053 | blk_stop_queue(msb->queue); |
| 2054 | msb->io_queue_stopped = true; |
| 2055 | spin_unlock_irqrestore(&msb->q_lock, flags); |
| 2056 | |
| 2057 | del_timer_sync(&msb->cache_flush_timer); |
| 2058 | flush_workqueue(msb->io_queue); |
| 2059 | |
| 2060 | if (msb->req) { |
| 2061 | spin_lock_irqsave(&msb->q_lock, flags); |
| 2062 | blk_requeue_request(msb->queue, msb->req); |
| 2063 | msb->req = NULL; |
| 2064 | spin_unlock_irqrestore(&msb->q_lock, flags); |
| 2065 | } |
| 2066 | |
| 2067 | } |
| 2068 | |
| 2069 | static void msb_start(struct memstick_dev *card) |
| 2070 | { |
| 2071 | struct msb_data *msb = memstick_get_drvdata(card); |
| 2072 | unsigned long flags; |
| 2073 | |
| 2074 | dbg("Resuming IO from msblock"); |
| 2075 | |
| 2076 | msb_invalidate_reg_window(msb); |
| 2077 | |
| 2078 | spin_lock_irqsave(&msb->q_lock, flags); |
| 2079 | if (!msb->io_queue_stopped || msb->card_dead) { |
| 2080 | spin_unlock_irqrestore(&msb->q_lock, flags); |
| 2081 | return; |
| 2082 | } |
| 2083 | spin_unlock_irqrestore(&msb->q_lock, flags); |
| 2084 | |
| 2085 | /* Kick cache flush anyway, its harmless */ |
| 2086 | msb->need_flush_cache = true; |
| 2087 | msb->io_queue_stopped = false; |
| 2088 | |
| 2089 | spin_lock_irqsave(&msb->q_lock, flags); |
| 2090 | blk_start_queue(msb->queue); |
| 2091 | spin_unlock_irqrestore(&msb->q_lock, flags); |
| 2092 | |
| 2093 | queue_work(msb->io_queue, &msb->io_work); |
| 2094 | |
| 2095 | } |
| 2096 | |
| 2097 | static const struct block_device_operations msb_bdops = { |
| 2098 | .open = msb_bd_open, |
| 2099 | .release = msb_bd_release, |
| 2100 | .getgeo = msb_bd_getgeo, |
| 2101 | .owner = THIS_MODULE |
| 2102 | }; |
| 2103 | |
| 2104 | /* Registers the block device */ |
| 2105 | static int msb_init_disk(struct memstick_dev *card) |
| 2106 | { |
| 2107 | struct msb_data *msb = memstick_get_drvdata(card); |
| 2108 | struct memstick_host *host = card->host; |
| 2109 | int rc; |
| 2110 | u64 limit = BLK_BOUNCE_HIGH; |
| 2111 | unsigned long capacity; |
| 2112 | |
| 2113 | if (host->dev.dma_mask && *(host->dev.dma_mask)) |
| 2114 | limit = *(host->dev.dma_mask); |
| 2115 | |
| 2116 | mutex_lock(&msb_disk_lock); |
| 2117 | msb->disk_id = idr_alloc(&msb_disk_idr, card, 0, 256, GFP_KERNEL); |
| 2118 | mutex_unlock(&msb_disk_lock); |
| 2119 | |
| 2120 | if (msb->disk_id < 0) |
| 2121 | return msb->disk_id; |
| 2122 | |
| 2123 | msb->disk = alloc_disk(0); |
| 2124 | if (!msb->disk) { |
| 2125 | rc = -ENOMEM; |
| 2126 | goto out_release_id; |
| 2127 | } |
| 2128 | |
| 2129 | msb->queue = blk_init_queue(msb_submit_req, &msb->q_lock); |
| 2130 | if (!msb->queue) { |
| 2131 | rc = -ENOMEM; |
| 2132 | goto out_put_disk; |
| 2133 | } |
| 2134 | |
| 2135 | msb->queue->queuedata = card; |
| 2136 | blk_queue_prep_rq(msb->queue, msb_prepare_req); |
| 2137 | |
| 2138 | blk_queue_bounce_limit(msb->queue, limit); |
| 2139 | blk_queue_max_hw_sectors(msb->queue, MS_BLOCK_MAX_PAGES); |
| 2140 | blk_queue_max_segments(msb->queue, MS_BLOCK_MAX_SEGS); |
| 2141 | blk_queue_max_segment_size(msb->queue, |
| 2142 | MS_BLOCK_MAX_PAGES * msb->page_size); |
| 2143 | blk_queue_logical_block_size(msb->queue, msb->page_size); |
| 2144 | |
| 2145 | sprintf(msb->disk->disk_name, "msblk%d", msb->disk_id); |
| 2146 | msb->disk->fops = &msb_bdops; |
| 2147 | msb->disk->private_data = msb; |
| 2148 | msb->disk->queue = msb->queue; |
| 2149 | msb->disk->driverfs_dev = &card->dev; |
| 2150 | msb->disk->flags |= GENHD_FL_EXT_DEVT; |
| 2151 | |
| 2152 | capacity = msb->pages_in_block * msb->logical_block_count; |
| 2153 | capacity *= (msb->page_size / 512); |
| 2154 | set_capacity(msb->disk, capacity); |
| 2155 | dbg("Set total disk size to %lu sectors", capacity); |
| 2156 | |
| 2157 | msb->usage_count = 1; |
| 2158 | msb->io_queue = alloc_ordered_workqueue("ms_block", WQ_MEM_RECLAIM); |
| 2159 | INIT_WORK(&msb->io_work, msb_io_work); |
| 2160 | sg_init_table(msb->prealloc_sg, MS_BLOCK_MAX_SEGS+1); |
| 2161 | |
| 2162 | if (msb->read_only) |
| 2163 | set_disk_ro(msb->disk, 1); |
| 2164 | |
| 2165 | msb_start(card); |
| 2166 | add_disk(msb->disk); |
| 2167 | dbg("Disk added"); |
| 2168 | return 0; |
| 2169 | |
| 2170 | out_put_disk: |
| 2171 | put_disk(msb->disk); |
| 2172 | out_release_id: |
| 2173 | mutex_lock(&msb_disk_lock); |
| 2174 | idr_remove(&msb_disk_idr, msb->disk_id); |
| 2175 | mutex_unlock(&msb_disk_lock); |
| 2176 | return rc; |
| 2177 | } |
| 2178 | |
| 2179 | static int msb_probe(struct memstick_dev *card) |
| 2180 | { |
| 2181 | struct msb_data *msb; |
| 2182 | int rc = 0; |
| 2183 | |
| 2184 | msb = kzalloc(sizeof(struct msb_data), GFP_KERNEL); |
| 2185 | if (!msb) |
| 2186 | return -ENOMEM; |
| 2187 | memstick_set_drvdata(card, msb); |
| 2188 | msb->card = card; |
| 2189 | spin_lock_init(&msb->q_lock); |
| 2190 | |
| 2191 | rc = msb_init_card(card); |
| 2192 | if (rc) |
| 2193 | goto out_free; |
| 2194 | |
| 2195 | rc = msb_init_disk(card); |
| 2196 | if (!rc) { |
| 2197 | card->check = msb_check_card; |
| 2198 | card->stop = msb_stop; |
| 2199 | card->start = msb_start; |
| 2200 | return 0; |
| 2201 | } |
| 2202 | out_free: |
| 2203 | memstick_set_drvdata(card, NULL); |
| 2204 | msb_data_clear(msb); |
| 2205 | kfree(msb); |
| 2206 | return rc; |
| 2207 | } |
| 2208 | |
| 2209 | static void msb_remove(struct memstick_dev *card) |
| 2210 | { |
| 2211 | struct msb_data *msb = memstick_get_drvdata(card); |
| 2212 | unsigned long flags; |
| 2213 | |
| 2214 | if (!msb->io_queue_stopped) |
| 2215 | msb_stop(card); |
| 2216 | |
| 2217 | dbg("Removing the disk device"); |
| 2218 | |
| 2219 | /* Take care of unhandled + new requests from now on */ |
| 2220 | spin_lock_irqsave(&msb->q_lock, flags); |
| 2221 | msb->card_dead = true; |
| 2222 | blk_start_queue(msb->queue); |
| 2223 | spin_unlock_irqrestore(&msb->q_lock, flags); |
| 2224 | |
| 2225 | /* Remove the disk */ |
| 2226 | del_gendisk(msb->disk); |
| 2227 | blk_cleanup_queue(msb->queue); |
| 2228 | msb->queue = NULL; |
| 2229 | |
| 2230 | mutex_lock(&msb_disk_lock); |
| 2231 | msb_data_clear(msb); |
| 2232 | mutex_unlock(&msb_disk_lock); |
| 2233 | |
| 2234 | msb_disk_release(msb->disk); |
| 2235 | memstick_set_drvdata(card, NULL); |
| 2236 | } |
| 2237 | |
| 2238 | #ifdef CONFIG_PM |
| 2239 | |
| 2240 | static int msb_suspend(struct memstick_dev *card, pm_message_t state) |
| 2241 | { |
| 2242 | msb_stop(card); |
| 2243 | return 0; |
| 2244 | } |
| 2245 | |
| 2246 | static int msb_resume(struct memstick_dev *card) |
| 2247 | { |
| 2248 | struct msb_data *msb = memstick_get_drvdata(card); |
| 2249 | struct msb_data *new_msb = NULL; |
| 2250 | bool card_dead = true; |
| 2251 | |
| 2252 | #ifndef CONFIG_MEMSTICK_UNSAFE_RESUME |
| 2253 | msb->card_dead = true; |
| 2254 | return 0; |
| 2255 | #endif |
| 2256 | mutex_lock(&card->host->lock); |
| 2257 | |
| 2258 | new_msb = kzalloc(sizeof(struct msb_data), GFP_KERNEL); |
| 2259 | if (!new_msb) |
| 2260 | goto out; |
| 2261 | |
| 2262 | new_msb->card = card; |
| 2263 | memstick_set_drvdata(card, new_msb); |
| 2264 | spin_lock_init(&new_msb->q_lock); |
| 2265 | sg_init_table(msb->prealloc_sg, MS_BLOCK_MAX_SEGS+1); |
| 2266 | |
| 2267 | if (msb_init_card(card)) |
| 2268 | goto out; |
| 2269 | |
| 2270 | if (msb->block_size != new_msb->block_size) |
| 2271 | goto out; |
| 2272 | |
| 2273 | if (memcmp(msb->boot_page, new_msb->boot_page, |
| 2274 | sizeof(struct ms_boot_page))) |
| 2275 | goto out; |
| 2276 | |
| 2277 | if (msb->logical_block_count != new_msb->logical_block_count || |
| 2278 | memcmp(msb->lba_to_pba_table, new_msb->lba_to_pba_table, |
| 2279 | msb->logical_block_count)) |
| 2280 | goto out; |
| 2281 | |
| 2282 | if (msb->block_count != new_msb->block_count || |
| 2283 | memcmp(msb->used_blocks_bitmap, new_msb->used_blocks_bitmap, |
| 2284 | msb->block_count / 8)) |
| 2285 | goto out; |
| 2286 | |
| 2287 | card_dead = false; |
| 2288 | out: |
| 2289 | if (card_dead) |
| 2290 | dbg("Card was removed/replaced during suspend"); |
| 2291 | |
| 2292 | msb->card_dead = card_dead; |
| 2293 | memstick_set_drvdata(card, msb); |
| 2294 | |
| 2295 | if (new_msb) { |
| 2296 | msb_data_clear(new_msb); |
| 2297 | kfree(new_msb); |
| 2298 | } |
| 2299 | |
| 2300 | msb_start(card); |
| 2301 | mutex_unlock(&card->host->lock); |
| 2302 | return 0; |
| 2303 | } |
| 2304 | #else |
| 2305 | |
| 2306 | #define msb_suspend NULL |
| 2307 | #define msb_resume NULL |
| 2308 | |
| 2309 | #endif /* CONFIG_PM */ |
| 2310 | |
| 2311 | static struct memstick_device_id msb_id_tbl[] = { |
| 2312 | {MEMSTICK_MATCH_ALL, MEMSTICK_TYPE_LEGACY, MEMSTICK_CATEGORY_STORAGE, |
| 2313 | MEMSTICK_CLASS_FLASH}, |
| 2314 | |
| 2315 | {MEMSTICK_MATCH_ALL, MEMSTICK_TYPE_LEGACY, MEMSTICK_CATEGORY_STORAGE, |
| 2316 | MEMSTICK_CLASS_ROM}, |
| 2317 | |
| 2318 | {MEMSTICK_MATCH_ALL, MEMSTICK_TYPE_LEGACY, MEMSTICK_CATEGORY_STORAGE, |
| 2319 | MEMSTICK_CLASS_RO}, |
| 2320 | |
| 2321 | {MEMSTICK_MATCH_ALL, MEMSTICK_TYPE_LEGACY, MEMSTICK_CATEGORY_STORAGE, |
| 2322 | MEMSTICK_CLASS_WP}, |
| 2323 | |
| 2324 | {MEMSTICK_MATCH_ALL, MEMSTICK_TYPE_DUO, MEMSTICK_CATEGORY_STORAGE_DUO, |
| 2325 | MEMSTICK_CLASS_DUO}, |
| 2326 | {} |
| 2327 | }; |
| 2328 | MODULE_DEVICE_TABLE(memstick, msb_id_tbl); |
| 2329 | |
| 2330 | |
| 2331 | static struct memstick_driver msb_driver = { |
| 2332 | .driver = { |
| 2333 | .name = DRIVER_NAME, |
| 2334 | .owner = THIS_MODULE |
| 2335 | }, |
| 2336 | .id_table = msb_id_tbl, |
| 2337 | .probe = msb_probe, |
| 2338 | .remove = msb_remove, |
| 2339 | .suspend = msb_suspend, |
| 2340 | .resume = msb_resume |
| 2341 | }; |
| 2342 | |
| 2343 | static int major; |
| 2344 | |
| 2345 | static int __init msb_init(void) |
| 2346 | { |
| 2347 | int rc = register_blkdev(0, DRIVER_NAME); |
| 2348 | |
| 2349 | if (rc < 0) { |
| 2350 | pr_err("failed to register major (error %d)\n", rc); |
| 2351 | return rc; |
| 2352 | } |
| 2353 | |
| 2354 | major = rc; |
| 2355 | rc = memstick_register_driver(&msb_driver); |
| 2356 | if (rc) { |
| 2357 | unregister_blkdev(major, DRIVER_NAME); |
| 2358 | pr_err("failed to register memstick driver (error %d)\n", rc); |
| 2359 | } |
| 2360 | |
| 2361 | return rc; |
| 2362 | } |
| 2363 | |
| 2364 | static void __exit msb_exit(void) |
| 2365 | { |
| 2366 | memstick_unregister_driver(&msb_driver); |
| 2367 | unregister_blkdev(major, DRIVER_NAME); |
| 2368 | idr_destroy(&msb_disk_idr); |
| 2369 | } |
| 2370 | |
| 2371 | module_init(msb_init); |
| 2372 | module_exit(msb_exit); |
| 2373 | |
| 2374 | module_param(cache_flush_timeout, int, S_IRUGO); |
| 2375 | MODULE_PARM_DESC(cache_flush_timeout, |
| 2376 | "Cache flush timeout in msec (1000 default)"); |
| 2377 | module_param(debug, int, S_IRUGO | S_IWUSR); |
| 2378 | MODULE_PARM_DESC(debug, "Debug level (0-2)"); |
| 2379 | |
| 2380 | module_param(verify_writes, bool, S_IRUGO); |
| 2381 | MODULE_PARM_DESC(verify_writes, "Read back and check all data that is written"); |
| 2382 | |
| 2383 | MODULE_LICENSE("GPL"); |
| 2384 | MODULE_AUTHOR("Maxim Levitsky"); |
| 2385 | MODULE_DESCRIPTION("Sony MemoryStick block device driver"); |