developer | 8d16ac2 | 2021-05-26 15:32:12 +0800 | [diff] [blame] | 1 | // SPDX-License-Identifier: GPL-2.0 |
| 2 | /* |
| 3 | * MTD layer for NAND Mapped-block Management (NMBM) |
| 4 | * |
| 5 | * Copyright (C) 2020 MediaTek Inc. All Rights Reserved. |
| 6 | * |
| 7 | * Author: Weijie Gao <weijie.gao@mediatek.com> |
| 8 | */ |
| 9 | |
| 10 | #include <linux/kernel.h> |
| 11 | #include <linux/module.h> |
| 12 | #include <linux/init.h> |
| 13 | #include <linux/device.h> |
| 14 | #include <linux/slab.h> |
| 15 | #include <linux/interrupt.h> |
| 16 | #include <linux/sched.h> |
| 17 | #include <linux/wait.h> |
| 18 | #include <linux/spinlock.h> |
| 19 | #include <linux/mtd/mtd.h> |
| 20 | #include <linux/mtd/flashchip.h> |
| 21 | #include <linux/mtd/partitions.h> |
| 22 | #include <linux/of_platform.h> |
| 23 | #include <linux/kern_levels.h> |
| 24 | |
| 25 | #include "nmbm-private.h" |
| 26 | #include "nmbm-debug.h" |
| 27 | |
| 28 | #define NMBM_MAX_RATIO_DEFAULT 1 |
| 29 | #define NMBM_MAX_BLOCKS_DEFAULT 256 |
| 30 | |
| 31 | struct nmbm_mtd { |
| 32 | struct mtd_info upper; |
| 33 | struct mtd_info *lower; |
| 34 | |
| 35 | struct nmbm_instance *ni; |
| 36 | uint8_t *page_cache; |
| 37 | |
| 38 | flstate_t state; |
| 39 | spinlock_t lock; |
| 40 | wait_queue_head_t wq; |
| 41 | |
| 42 | struct device *dev; |
| 43 | struct list_head node; |
| 44 | }; |
| 45 | |
| 46 | struct list_head nmbm_devs; |
| 47 | static DEFINE_MUTEX(nmbm_devs_lock); |
| 48 | |
| 49 | static int nmbm_lower_read_page(void *arg, uint64_t addr, void *buf, void *oob, |
| 50 | enum nmbm_oob_mode mode) |
| 51 | { |
| 52 | struct nmbm_mtd *nm = arg; |
| 53 | struct mtd_oob_ops ops; |
| 54 | int ret; |
| 55 | |
| 56 | memset(&ops, 0, sizeof(ops)); |
| 57 | |
| 58 | switch (mode) { |
| 59 | case NMBM_MODE_PLACE_OOB: |
| 60 | ops.mode = MTD_OPS_PLACE_OOB; |
| 61 | break; |
| 62 | case NMBM_MODE_AUTO_OOB: |
| 63 | ops.mode = MTD_OPS_AUTO_OOB; |
| 64 | break; |
| 65 | case NMBM_MODE_RAW: |
| 66 | ops.mode = MTD_OPS_RAW; |
| 67 | break; |
| 68 | default: |
| 69 | pr_debug("%s: unsupported NMBM mode: %u\n", __func__, mode); |
| 70 | return -ENOTSUPP; |
| 71 | } |
| 72 | |
| 73 | if (buf) { |
| 74 | ops.datbuf = buf; |
| 75 | ops.len = nm->lower->writesize; |
| 76 | } |
| 77 | |
| 78 | if (oob) { |
| 79 | ops.oobbuf = oob; |
| 80 | ops.ooblen = mtd_oobavail(nm->lower, &ops); |
| 81 | } |
| 82 | |
| 83 | ret = mtd_read_oob(nm->lower, addr, &ops); |
| 84 | nm->upper.ecc_stats.corrected = nm->lower->ecc_stats.corrected; |
| 85 | nm->upper.ecc_stats.failed = nm->lower->ecc_stats.failed; |
| 86 | |
| 87 | if (ret == -EBADMSG) |
| 88 | return 1; |
| 89 | |
| 90 | if (ret && ret != -EUCLEAN) |
| 91 | return ret; |
| 92 | |
| 93 | return 0; |
| 94 | } |
| 95 | |
| 96 | static int nmbm_lower_write_page(void *arg, uint64_t addr, const void *buf, |
| 97 | const void *oob, enum nmbm_oob_mode mode) |
| 98 | { |
| 99 | struct nmbm_mtd *nm = arg; |
| 100 | struct mtd_oob_ops ops; |
| 101 | |
| 102 | memset(&ops, 0, sizeof(ops)); |
| 103 | |
| 104 | switch (mode) { |
| 105 | case NMBM_MODE_PLACE_OOB: |
| 106 | ops.mode = MTD_OPS_PLACE_OOB; |
| 107 | break; |
| 108 | case NMBM_MODE_AUTO_OOB: |
| 109 | ops.mode = MTD_OPS_AUTO_OOB; |
| 110 | break; |
| 111 | case NMBM_MODE_RAW: |
| 112 | ops.mode = MTD_OPS_RAW; |
| 113 | break; |
| 114 | default: |
| 115 | pr_debug("%s: unsupported NMBM mode: %u\n", __func__, mode); |
| 116 | return -ENOTSUPP; |
| 117 | } |
| 118 | |
| 119 | if (buf) { |
| 120 | ops.datbuf = (uint8_t *)buf; |
| 121 | ops.len = nm->lower->writesize; |
| 122 | } |
| 123 | |
| 124 | if (oob) { |
| 125 | ops.oobbuf = (uint8_t *)oob; |
| 126 | ops.ooblen = mtd_oobavail(nm->lower, &ops); |
| 127 | } |
| 128 | |
| 129 | return mtd_write_oob(nm->lower, addr, &ops); |
| 130 | } |
| 131 | |
| 132 | static int nmbm_lower_erase_block(void *arg, uint64_t addr) |
| 133 | { |
| 134 | struct nmbm_mtd *nm = arg; |
| 135 | struct erase_info ei; |
| 136 | |
| 137 | memset(&ei, 0, sizeof(ei)); |
| 138 | |
| 139 | ei.addr = addr; |
| 140 | ei.len = nm->lower->erasesize; |
| 141 | |
| 142 | return mtd_erase(nm->lower, &ei); |
| 143 | } |
| 144 | |
| 145 | static int nmbm_lower_is_bad_block(void *arg, uint64_t addr) |
| 146 | { |
| 147 | struct nmbm_mtd *nm = arg; |
| 148 | |
| 149 | return mtd_block_isbad(nm->lower, addr); |
| 150 | } |
| 151 | |
| 152 | static int nmbm_lower_mark_bad_block(void *arg, uint64_t addr) |
| 153 | { |
| 154 | struct nmbm_mtd *nm = arg; |
| 155 | |
| 156 | return mtd_block_markbad(nm->lower, addr); |
| 157 | } |
| 158 | |
| 159 | static void nmbm_lower_log(void *arg, enum nmbm_log_category level, |
| 160 | const char *fmt, va_list ap) |
| 161 | { |
| 162 | struct nmbm_mtd *nm = arg; |
| 163 | char *msg; |
| 164 | char *kl; |
| 165 | |
| 166 | msg = kvasprintf(GFP_KERNEL, fmt, ap); |
| 167 | if (!msg) { |
| 168 | dev_warn(nm->dev, "unable to print log\n"); |
| 169 | return; |
| 170 | } |
| 171 | |
| 172 | switch (level) { |
| 173 | case NMBM_LOG_DEBUG: |
| 174 | kl = KERN_DEBUG; |
| 175 | break; |
| 176 | case NMBM_LOG_WARN: |
| 177 | kl = KERN_WARNING; |
| 178 | break; |
| 179 | case NMBM_LOG_ERR: |
| 180 | kl = KERN_ERR; |
| 181 | break; |
| 182 | case NMBM_LOG_EMERG: |
| 183 | kl = KERN_EMERG; |
| 184 | break; |
| 185 | default: |
| 186 | kl = KERN_INFO ; |
| 187 | } |
| 188 | |
| 189 | dev_printk(kl, nm->dev, "%s", msg); |
| 190 | |
| 191 | kfree(msg); |
| 192 | } |
| 193 | |
| 194 | static int nmbm_get_device(struct nmbm_mtd *nm, int new_state) |
| 195 | { |
| 196 | DECLARE_WAITQUEUE(wait, current); |
| 197 | |
| 198 | retry: |
| 199 | spin_lock(&nm->lock); |
| 200 | |
| 201 | if (nm->state == FL_READY) { |
| 202 | nm->state = new_state; |
| 203 | spin_unlock(&nm->lock); |
| 204 | return 0; |
| 205 | } |
| 206 | |
| 207 | if (new_state == FL_PM_SUSPENDED) { |
| 208 | if (nm->state == FL_PM_SUSPENDED) { |
| 209 | spin_unlock(&nm->lock); |
| 210 | return 0; |
| 211 | } |
| 212 | } |
| 213 | |
| 214 | set_current_state(TASK_UNINTERRUPTIBLE); |
| 215 | add_wait_queue(&nm->wq, &wait); |
| 216 | spin_unlock(&nm->lock); |
| 217 | schedule(); |
| 218 | remove_wait_queue(&nm->wq, &wait); |
| 219 | goto retry; |
| 220 | } |
| 221 | |
| 222 | static void nmbm_release_device(struct nmbm_mtd *nm) |
| 223 | { |
| 224 | spin_lock(&nm->lock); |
| 225 | nm->state = FL_READY; |
| 226 | wake_up(&nm->wq); |
| 227 | spin_unlock(&nm->lock); |
| 228 | } |
| 229 | |
| 230 | static int nmbm_mtd_erase(struct mtd_info *mtd, struct erase_info *instr) |
| 231 | { |
| 232 | struct nmbm_mtd *nm = container_of(mtd, struct nmbm_mtd, upper); |
| 233 | int ret; |
| 234 | |
| 235 | nmbm_get_device(nm, FL_ERASING); |
| 236 | |
| 237 | ret = nmbm_erase_block_range(nm->ni, instr->addr, instr->len, |
| 238 | &instr->fail_addr); |
| 239 | |
| 240 | nmbm_release_device(nm); |
| 241 | |
| 242 | if (!ret) |
| 243 | return 0; |
| 244 | |
| 245 | return -EIO; |
| 246 | } |
| 247 | |
| 248 | static int nmbm_mtd_read_data(struct nmbm_mtd *nm, uint64_t addr, |
| 249 | struct mtd_oob_ops *ops, enum nmbm_oob_mode mode) |
| 250 | { |
| 251 | size_t len, ooblen, maxooblen, chklen; |
| 252 | uint32_t col, ooboffs; |
| 253 | uint8_t *datcache, *oobcache; |
| 254 | int ret; |
| 255 | |
| 256 | col = addr & nm->lower->writesize_mask; |
| 257 | addr &= ~nm->lower->writesize_mask; |
| 258 | maxooblen = mtd_oobavail(nm->lower, ops); |
| 259 | ooboffs = ops->ooboffs; |
| 260 | ooblen = ops->ooblen; |
| 261 | len = ops->len; |
| 262 | |
| 263 | datcache = len ? nm->page_cache : NULL; |
| 264 | oobcache = ooblen ? nm->page_cache + nm->lower->writesize : NULL; |
| 265 | |
| 266 | ops->oobretlen = 0; |
| 267 | ops->retlen = 0; |
| 268 | |
| 269 | while (len || ooblen) { |
| 270 | ret = nmbm_read_single_page(nm->ni, addr, datcache, oobcache, |
| 271 | mode); |
| 272 | if (ret) { |
| 273 | if (ret > 0) |
| 274 | return -EBADMSG; |
| 275 | return -EIO; |
| 276 | } |
| 277 | |
| 278 | if (len) { |
| 279 | /* Move data */ |
| 280 | chklen = nm->lower->writesize - col; |
| 281 | if (chklen > len) |
| 282 | chklen = len; |
| 283 | |
| 284 | memcpy(ops->datbuf + ops->retlen, datcache + col, |
| 285 | chklen); |
| 286 | len -= chklen; |
| 287 | col = 0; /* (col + chklen) % */ |
| 288 | ops->retlen += chklen; |
| 289 | } |
| 290 | |
| 291 | if (ooblen) { |
| 292 | /* Move oob */ |
| 293 | chklen = maxooblen - ooboffs; |
| 294 | if (chklen > ooblen) |
| 295 | chklen = ooblen; |
| 296 | |
| 297 | memcpy(ops->oobbuf + ops->oobretlen, oobcache + ooboffs, |
| 298 | chklen); |
| 299 | ooblen -= chklen; |
| 300 | ooboffs = 0; /* (ooboffs + chklen) % maxooblen; */ |
| 301 | ops->oobretlen += chklen; |
| 302 | } |
| 303 | |
| 304 | addr += nm->lower->writesize; |
| 305 | } |
| 306 | |
| 307 | return 0; |
| 308 | } |
| 309 | |
| 310 | static int nmbm_mtd_read_oob(struct mtd_info *mtd, loff_t from, |
| 311 | struct mtd_oob_ops *ops) |
| 312 | { |
| 313 | struct nmbm_mtd *nm = container_of(mtd, struct nmbm_mtd, upper); |
| 314 | uint32_t maxooblen; |
| 315 | enum nmbm_oob_mode mode; |
| 316 | int ret; |
| 317 | |
| 318 | if (!ops->oobbuf && !ops->datbuf) { |
| 319 | if (ops->ooblen || ops->len) |
| 320 | return -EINVAL; |
| 321 | |
| 322 | return 0; |
| 323 | } |
| 324 | |
| 325 | switch (ops->mode) { |
| 326 | case MTD_OPS_PLACE_OOB: |
| 327 | mode = NMBM_MODE_PLACE_OOB; |
| 328 | break; |
| 329 | case MTD_OPS_AUTO_OOB: |
| 330 | mode = NMBM_MODE_AUTO_OOB; |
| 331 | break; |
| 332 | case MTD_OPS_RAW: |
| 333 | mode = NMBM_MODE_RAW; |
| 334 | break; |
| 335 | default: |
| 336 | pr_debug("%s: unsupported oob mode: %u\n", __func__, ops->mode); |
| 337 | return -ENOTSUPP; |
| 338 | } |
| 339 | |
| 340 | maxooblen = mtd_oobavail(mtd, ops); |
| 341 | |
| 342 | /* Do not allow read past end of device */ |
| 343 | if (ops->datbuf && (from + ops->len) > mtd->size) { |
| 344 | pr_debug("%s: attempt to read beyond end of device\n", |
| 345 | __func__); |
| 346 | return -EINVAL; |
| 347 | } |
| 348 | |
| 349 | if (!ops->oobbuf) { |
| 350 | nmbm_get_device(nm, FL_READING); |
| 351 | |
| 352 | /* Optimized for reading data only */ |
| 353 | ret = nmbm_read_range(nm->ni, from, ops->len, ops->datbuf, |
| 354 | mode, &ops->retlen); |
| 355 | |
| 356 | nmbm_release_device(nm); |
| 357 | |
| 358 | if (ret > 0) |
| 359 | return -EBADMSG; |
| 360 | else if (ret) |
| 361 | return -EIO; |
| 362 | |
| 363 | return 0; |
| 364 | } |
| 365 | |
| 366 | if (unlikely(ops->ooboffs >= maxooblen)) { |
| 367 | pr_debug("%s: attempt to start read outside oob\n", |
| 368 | __func__); |
| 369 | return -EINVAL; |
| 370 | } |
| 371 | |
| 372 | if (unlikely(from >= mtd->size || |
| 373 | ops->ooboffs + ops->ooblen > ((mtd->size >> mtd->writesize_shift) - |
| 374 | (from >> mtd->writesize_shift)) * maxooblen)) { |
| 375 | pr_debug("%s: attempt to read beyond end of device\n", |
| 376 | __func__); |
| 377 | return -EINVAL; |
| 378 | } |
| 379 | |
| 380 | nmbm_get_device(nm, FL_READING); |
| 381 | ret = nmbm_mtd_read_data(nm, from, ops, mode); |
| 382 | nmbm_release_device(nm); |
| 383 | |
| 384 | return ret; |
| 385 | } |
| 386 | |
| 387 | static int nmbm_mtd_write_data(struct nmbm_mtd *nm, uint64_t addr, |
| 388 | struct mtd_oob_ops *ops, enum nmbm_oob_mode mode) |
| 389 | { |
| 390 | size_t len, ooblen, maxooblen, chklen; |
| 391 | uint32_t col, ooboffs; |
| 392 | uint8_t *datcache, *oobcache; |
| 393 | int ret; |
| 394 | |
| 395 | col = addr & nm->lower->writesize_mask; |
| 396 | addr &= ~nm->lower->writesize_mask; |
| 397 | maxooblen = mtd_oobavail(nm->lower, ops); |
| 398 | ooboffs = ops->ooboffs; |
| 399 | ooblen = ops->ooblen; |
| 400 | len = ops->len; |
| 401 | |
| 402 | datcache = len ? nm->page_cache : NULL; |
| 403 | oobcache = ooblen ? nm->page_cache + nm->lower->writesize : NULL; |
| 404 | |
| 405 | ops->oobretlen = 0; |
| 406 | ops->retlen = 0; |
| 407 | |
| 408 | while (len || ooblen) { |
| 409 | if (len) { |
| 410 | /* Move data */ |
| 411 | chklen = nm->lower->writesize - col; |
| 412 | if (chklen > len) |
| 413 | chklen = len; |
| 414 | |
| 415 | memset(datcache, 0xff, col); |
| 416 | memcpy(datcache + col, ops->datbuf + ops->retlen, |
| 417 | chklen); |
| 418 | memset(datcache + col + chklen, 0xff, |
| 419 | nm->lower->writesize - col - chklen); |
| 420 | len -= chklen; |
| 421 | col = 0; /* (col + chklen) % */ |
| 422 | ops->retlen += chklen; |
| 423 | } |
| 424 | |
| 425 | if (ooblen) { |
| 426 | /* Move oob */ |
| 427 | chklen = maxooblen - ooboffs; |
| 428 | if (chklen > ooblen) |
| 429 | chklen = ooblen; |
| 430 | |
| 431 | memset(oobcache, 0xff, ooboffs); |
| 432 | memcpy(oobcache + ooboffs, |
| 433 | ops->oobbuf + ops->oobretlen, chklen); |
| 434 | memset(oobcache + ooboffs + chklen, 0xff, |
| 435 | nm->lower->oobsize - ooboffs - chklen); |
| 436 | ooblen -= chklen; |
| 437 | ooboffs = 0; /* (ooboffs + chklen) % maxooblen; */ |
| 438 | ops->oobretlen += chklen; |
| 439 | } |
| 440 | |
| 441 | ret = nmbm_write_single_page(nm->ni, addr, datcache, oobcache, |
| 442 | mode); |
| 443 | if (ret) |
| 444 | return ret; |
| 445 | |
| 446 | addr += nm->lower->writesize; |
| 447 | } |
| 448 | |
| 449 | return 0; |
| 450 | } |
| 451 | |
| 452 | static int nmbm_mtd_write_oob(struct mtd_info *mtd, loff_t to, |
| 453 | struct mtd_oob_ops *ops) |
| 454 | { |
| 455 | struct nmbm_mtd *nm = container_of(mtd, struct nmbm_mtd, upper); |
| 456 | enum nmbm_oob_mode mode; |
| 457 | uint32_t maxooblen; |
| 458 | int ret; |
| 459 | |
| 460 | if (!ops->oobbuf && !ops->datbuf) { |
| 461 | if (ops->ooblen || ops->len) |
| 462 | return -EINVAL; |
| 463 | |
| 464 | return 0; |
| 465 | } |
| 466 | |
| 467 | switch (ops->mode) { |
| 468 | case MTD_OPS_PLACE_OOB: |
| 469 | mode = NMBM_MODE_PLACE_OOB; |
| 470 | break; |
| 471 | case MTD_OPS_AUTO_OOB: |
| 472 | mode = NMBM_MODE_AUTO_OOB; |
| 473 | break; |
| 474 | case MTD_OPS_RAW: |
| 475 | mode = NMBM_MODE_RAW; |
| 476 | break; |
| 477 | default: |
| 478 | pr_debug("%s: unsupported oob mode: %u\n", __func__, |
| 479 | ops->mode); |
| 480 | return -ENOTSUPP; |
| 481 | } |
| 482 | |
| 483 | maxooblen = mtd_oobavail(mtd, ops); |
| 484 | |
| 485 | /* Do not allow write past end of device */ |
| 486 | if (ops->datbuf && (to + ops->len) > mtd->size) { |
| 487 | pr_debug("%s: attempt to write beyond end of device\n", |
| 488 | __func__); |
| 489 | return -EINVAL; |
| 490 | } |
| 491 | |
| 492 | if (!ops->oobbuf) { |
| 493 | nmbm_get_device(nm, FL_WRITING); |
| 494 | |
| 495 | /* Optimized for writing data only */ |
| 496 | ret = nmbm_write_range(nm->ni, to, ops->len, ops->datbuf, |
| 497 | mode, &ops->retlen); |
| 498 | |
| 499 | nmbm_release_device(nm); |
| 500 | |
| 501 | return ret; |
| 502 | } |
| 503 | |
| 504 | if (unlikely(ops->ooboffs >= maxooblen)) { |
| 505 | pr_debug("%s: attempt to start write outside oob\n", |
| 506 | __func__); |
| 507 | return -EINVAL; |
| 508 | } |
| 509 | |
| 510 | if (unlikely(to >= mtd->size || |
| 511 | ops->ooboffs + ops->ooblen > ((mtd->size >> mtd->writesize_shift) - |
| 512 | (to >> mtd->writesize_shift)) * maxooblen)) { |
| 513 | pr_debug("%s: attempt to write beyond end of device\n", |
| 514 | __func__); |
| 515 | return -EINVAL; |
| 516 | } |
| 517 | |
| 518 | nmbm_get_device(nm, FL_WRITING); |
| 519 | ret = nmbm_mtd_write_data(nm, to, ops, mode); |
| 520 | nmbm_release_device(nm); |
| 521 | |
| 522 | return ret; |
| 523 | } |
| 524 | |
| 525 | static int nmbm_mtd_block_isbad(struct mtd_info *mtd, loff_t offs) |
| 526 | { |
| 527 | struct nmbm_mtd *nm = container_of(mtd, struct nmbm_mtd, upper); |
| 528 | int ret; |
| 529 | |
| 530 | nmbm_get_device(nm, FL_READING); |
| 531 | ret = nmbm_check_bad_block(nm->ni, offs); |
| 532 | nmbm_release_device(nm); |
| 533 | |
| 534 | return ret; |
| 535 | } |
| 536 | |
| 537 | static int nmbm_mtd_block_markbad(struct mtd_info *mtd, loff_t offs) |
| 538 | { |
| 539 | struct nmbm_mtd *nm = container_of(mtd, struct nmbm_mtd, upper); |
| 540 | int ret; |
| 541 | |
| 542 | nmbm_get_device(nm, FL_WRITING); |
| 543 | ret = nmbm_mark_bad_block(nm->ni, offs); |
| 544 | nmbm_release_device(nm); |
| 545 | |
| 546 | return ret; |
| 547 | } |
| 548 | |
| 549 | static void nmbm_mtd_shutdown(struct mtd_info *mtd) |
| 550 | { |
| 551 | struct nmbm_mtd *nm = container_of(mtd, struct nmbm_mtd, upper); |
| 552 | |
| 553 | nmbm_get_device(nm, FL_PM_SUSPENDED); |
| 554 | } |
| 555 | |
| 556 | static int nmbm_probe(struct platform_device *pdev) |
| 557 | { |
| 558 | struct device_node *mtd_np, *np = pdev->dev.of_node; |
| 559 | uint32_t max_ratio, max_reserved_blocks, alloc_size; |
| 560 | struct nmbm_lower_device nld; |
| 561 | struct mtd_info *lower, *mtd; |
| 562 | struct nmbm_mtd *nm; |
| 563 | const char *mtdname; |
| 564 | bool forced_create; |
| 565 | int ret; |
| 566 | |
| 567 | mtd_np = of_parse_phandle(np, "lower-mtd-device", 0); |
| 568 | if (mtd_np) { |
| 569 | lower = get_mtd_device_by_node(mtd_np); |
| 570 | if (!IS_ERR(lower)) |
| 571 | goto do_attach_mtd; |
| 572 | |
| 573 | dev_dbg(&pdev->dev, "failed to find mtd device by phandle\n"); |
| 574 | return -EPROBE_DEFER; |
| 575 | } |
| 576 | |
| 577 | ret = of_property_read_string(np, "lower-mtd-name", &mtdname); |
| 578 | if (!ret) { |
| 579 | lower = get_mtd_device_nm(mtdname); |
| 580 | if (!IS_ERR(lower)) |
| 581 | goto do_attach_mtd; |
| 582 | |
| 583 | dev_dbg(&pdev->dev, "failed to find mtd device by name '%s'\n", |
| 584 | mtdname); |
| 585 | return -EPROBE_DEFER; |
| 586 | } |
| 587 | |
| 588 | do_attach_mtd: |
| 589 | if (of_property_read_u32(np, "max-ratio", &max_ratio)) |
| 590 | max_ratio = NMBM_MAX_RATIO_DEFAULT; |
| 591 | |
| 592 | if (of_property_read_u32(np, "max-reserved-blocks", |
| 593 | &max_reserved_blocks)) |
| 594 | max_reserved_blocks = NMBM_MAX_BLOCKS_DEFAULT; |
| 595 | |
| 596 | forced_create = of_property_read_bool(np, "forced-create"); |
| 597 | |
| 598 | memset(&nld, 0, sizeof(nld)); |
| 599 | |
| 600 | nld.flags = forced_create ? NMBM_F_CREATE : 0; |
| 601 | nld.max_ratio = max_ratio; |
| 602 | nld.max_reserved_blocks = max_reserved_blocks; |
| 603 | |
| 604 | nld.size = lower->size; |
| 605 | nld.erasesize = lower->erasesize; |
| 606 | nld.writesize = lower->writesize; |
| 607 | nld.oobsize = lower->oobsize; |
| 608 | nld.oobavail = lower->oobavail; |
| 609 | |
| 610 | nld.read_page = nmbm_lower_read_page; |
| 611 | nld.write_page = nmbm_lower_write_page; |
| 612 | nld.erase_block = nmbm_lower_erase_block; |
| 613 | nld.is_bad_block = nmbm_lower_is_bad_block; |
| 614 | nld.mark_bad_block = nmbm_lower_mark_bad_block; |
| 615 | |
| 616 | nld.logprint = nmbm_lower_log; |
| 617 | |
| 618 | alloc_size = nmbm_calc_structure_size(&nld); |
| 619 | |
| 620 | nm = devm_kzalloc(&pdev->dev, sizeof(*nm) + alloc_size + |
| 621 | lower->writesize + lower->oobsize, GFP_KERNEL); |
| 622 | if (!nm) { |
| 623 | ret = -ENOMEM; |
| 624 | goto out; |
| 625 | } |
| 626 | |
| 627 | nm->ni = (void *)nm + sizeof(*nm); |
| 628 | nm->page_cache = (uint8_t *)nm->ni + alloc_size; |
| 629 | nm->lower = lower; |
| 630 | nm->dev = &pdev->dev; |
| 631 | |
| 632 | INIT_LIST_HEAD(&nm->node); |
| 633 | spin_lock_init(&nm->lock); |
| 634 | init_waitqueue_head(&nm->wq); |
| 635 | |
| 636 | nld.arg = nm; |
| 637 | |
| 638 | ret = nmbm_attach(&nld, nm->ni); |
| 639 | if (ret) |
| 640 | goto out; |
| 641 | |
| 642 | /* Initialize upper mtd */ |
| 643 | mtd = &nm->upper; |
| 644 | |
| 645 | mtd->owner = THIS_MODULE; |
| 646 | mtd->dev.parent = &pdev->dev; |
| 647 | mtd->type = lower->type; |
| 648 | mtd->flags = lower->flags; |
| 649 | |
| 650 | mtd->size = (uint64_t)nm->ni->data_block_count * lower->erasesize; |
| 651 | mtd->erasesize = lower->erasesize; |
| 652 | mtd->writesize = lower->writesize; |
| 653 | mtd->writebufsize = lower->writesize; |
| 654 | mtd->oobsize = lower->oobsize; |
| 655 | mtd->oobavail = lower->oobavail; |
| 656 | |
| 657 | mtd->erasesize_shift = lower->erasesize_shift; |
| 658 | mtd->writesize_shift = lower->writesize_shift; |
| 659 | mtd->erasesize_mask = lower->erasesize_mask; |
| 660 | mtd->writesize_mask = lower->writesize_mask; |
| 661 | |
| 662 | mtd->bitflip_threshold = lower->bitflip_threshold; |
| 663 | |
| 664 | mtd->ooblayout = lower->ooblayout; |
| 665 | |
| 666 | mtd->ecc_step_size = lower->ecc_step_size; |
| 667 | mtd->ecc_strength = lower->ecc_strength; |
| 668 | |
| 669 | mtd->numeraseregions = lower->numeraseregions; |
| 670 | mtd->eraseregions = lower->eraseregions; |
| 671 | |
| 672 | mtd->_erase = nmbm_mtd_erase; |
| 673 | mtd->_read_oob = nmbm_mtd_read_oob; |
| 674 | mtd->_write_oob = nmbm_mtd_write_oob; |
| 675 | mtd->_block_isbad = nmbm_mtd_block_isbad; |
| 676 | mtd->_block_markbad = nmbm_mtd_block_markbad; |
| 677 | mtd->_reboot = nmbm_mtd_shutdown; |
| 678 | |
| 679 | mtd_set_of_node(mtd, np); |
| 680 | |
| 681 | ret = mtd_device_register(mtd, NULL, 0); |
| 682 | if (ret) { |
| 683 | dev_err(&pdev->dev, "failed to register mtd device\n"); |
| 684 | nmbm_detach(nm->ni); |
| 685 | goto out; |
| 686 | } |
| 687 | |
| 688 | platform_set_drvdata(pdev, nm); |
| 689 | |
| 690 | mutex_lock(&nmbm_devs_lock); |
| 691 | list_add_tail(&nm->node, &nmbm_devs); |
| 692 | mutex_unlock(&nmbm_devs_lock); |
| 693 | |
| 694 | return 0; |
| 695 | |
| 696 | out: |
| 697 | if (nm) |
| 698 | devm_kfree(&pdev->dev, nm); |
| 699 | |
| 700 | put_mtd_device(lower); |
| 701 | |
| 702 | return ret; |
| 703 | } |
| 704 | |
| 705 | static int nmbm_remove(struct platform_device *pdev) |
| 706 | { |
| 707 | struct nmbm_mtd *nm = platform_get_drvdata(pdev); |
| 708 | struct mtd_info *lower = nm->lower; |
| 709 | int ret; |
| 710 | |
| 711 | ret = mtd_device_unregister(&nm->upper); |
| 712 | if (ret) |
| 713 | return ret; |
| 714 | |
| 715 | nmbm_detach(nm->ni); |
| 716 | |
| 717 | mutex_lock(&nmbm_devs_lock); |
| 718 | list_add_tail(&nm->node, &nmbm_devs); |
| 719 | mutex_unlock(&nmbm_devs_lock); |
| 720 | |
| 721 | devm_kfree(&pdev->dev, nm); |
| 722 | |
| 723 | put_mtd_device(lower); |
| 724 | |
| 725 | platform_set_drvdata(pdev, NULL); |
| 726 | |
| 727 | return 0; |
| 728 | } |
| 729 | |
| 730 | static const struct of_device_id nmbm_ids[] = { |
| 731 | { .compatible = "generic,nmbm" }, |
| 732 | { }, |
| 733 | }; |
| 734 | |
| 735 | MODULE_DEVICE_TABLE(of, nmbm_ids); |
| 736 | |
| 737 | static struct platform_driver nmbm_driver = { |
| 738 | .probe = nmbm_probe, |
| 739 | .remove = nmbm_remove, |
| 740 | .driver = { |
| 741 | .name = "nmbm", |
| 742 | .of_match_table = nmbm_ids, |
| 743 | }, |
| 744 | }; |
| 745 | |
| 746 | static int __init nmbm_init(void) |
| 747 | { |
| 748 | int ret; |
| 749 | |
| 750 | INIT_LIST_HEAD(&nmbm_devs); |
| 751 | |
| 752 | ret = platform_driver_register(&nmbm_driver); |
| 753 | if (ret) { |
| 754 | pr_err("failed to register nmbm driver\n"); |
| 755 | return ret; |
| 756 | } |
| 757 | |
| 758 | return 0; |
| 759 | } |
| 760 | module_init(nmbm_init); |
| 761 | |
| 762 | static void __exit nmbm_exit(void) |
| 763 | { |
| 764 | platform_driver_unregister(&nmbm_driver); |
| 765 | } |
| 766 | module_exit(nmbm_exit); |
| 767 | |
| 768 | MODULE_LICENSE("GPL"); |
| 769 | MODULE_AUTHOR("Weijie Gao <weijie.gao@mediatek.com>"); |
| 770 | MODULE_DESCRIPTION("NAND mapping block management"); |