1 /* 2 * linux/drivers/mmc/core/mmc.c 3 * 4 * Copyright (C) 2003-2004 Russell King, All Rights Reserved. 5 * Copyright (C) 2005-2007 Pierre Ossman, All Rights Reserved. 6 * MMCv4 support Copyright (C) 2006 Philip Langdale, All Rights Reserved. 7 * 8 * This program is free software; you can redistribute it and/or modify 9 * it under the terms of the GNU General Public License version 2 as 10 * published by the Free Software Foundation. 11 */ 12 13 #include <linux/err.h> 14 #include <linux/slab.h> 15 #include <linux/stat.h> 16 17 #include <linux/mmc/host.h> 18 #include <linux/mmc/card.h> 19 #include <linux/mmc/mmc.h> 20 21 #include "core.h" 22 #include "bus.h" 23 #include "mmc_ops.h" 24 #include "sd_ops.h" 25 26 static const unsigned int tran_exp[] = { 27 10000, 100000, 1000000, 10000000, 28 0, 0, 0, 0 29 }; 30 31 static const unsigned char tran_mant[] = { 32 0, 10, 12, 13, 15, 20, 25, 30, 33 35, 40, 45, 50, 55, 60, 70, 80, 34 }; 35 36 static const unsigned int tacc_exp[] = { 37 1, 10, 100, 1000, 10000, 100000, 1000000, 10000000, 38 }; 39 40 static const unsigned int tacc_mant[] = { 41 0, 10, 12, 13, 15, 20, 25, 30, 42 35, 40, 45, 50, 55, 60, 70, 80, 43 }; 44 45 #define UNSTUFF_BITS(resp,start,size) \ 46 ({ \ 47 const int __size = size; \ 48 const u32 __mask = (__size < 32 ? 1 << __size : 0) - 1; \ 49 const int __off = 3 - ((start) / 32); \ 50 const int __shft = (start) & 31; \ 51 u32 __res; \ 52 \ 53 __res = resp[__off] >> __shft; \ 54 if (__size + __shft > 32) \ 55 __res |= resp[__off-1] << ((32 - __shft) % 32); \ 56 __res & __mask; \ 57 }) 58 59 /* 60 * Given the decoded CSD structure, decode the raw CID to our CID structure. 61 */ 62 static int mmc_decode_cid(struct mmc_card *card) 63 { 64 u32 *resp = card->raw_cid; 65 66 /* 67 * The selection of the format here is based upon published 68 * specs from sandisk and from what people have reported. 69 */ 70 switch (card->csd.mmca_vsn) { 71 case 0: /* MMC v1.0 - v1.2 */ 72 case 1: /* MMC v1.4 */ 73 card->cid.manfid = UNSTUFF_BITS(resp, 104, 24); 74 card->cid.prod_name[0] = UNSTUFF_BITS(resp, 96, 8); 75 card->cid.prod_name[1] = UNSTUFF_BITS(resp, 88, 8); 76 card->cid.prod_name[2] = UNSTUFF_BITS(resp, 80, 8); 77 card->cid.prod_name[3] = UNSTUFF_BITS(resp, 72, 8); 78 card->cid.prod_name[4] = UNSTUFF_BITS(resp, 64, 8); 79 card->cid.prod_name[5] = UNSTUFF_BITS(resp, 56, 8); 80 card->cid.prod_name[6] = UNSTUFF_BITS(resp, 48, 8); 81 card->cid.hwrev = UNSTUFF_BITS(resp, 44, 4); 82 card->cid.fwrev = UNSTUFF_BITS(resp, 40, 4); 83 card->cid.serial = UNSTUFF_BITS(resp, 16, 24); 84 card->cid.month = UNSTUFF_BITS(resp, 12, 4); 85 card->cid.year = UNSTUFF_BITS(resp, 8, 4) + 1997; 86 break; 87 88 case 2: /* MMC v2.0 - v2.2 */ 89 case 3: /* MMC v3.1 - v3.3 */ 90 case 4: /* MMC v4 */ 91 card->cid.manfid = UNSTUFF_BITS(resp, 120, 8); 92 card->cid.oemid = UNSTUFF_BITS(resp, 104, 16); 93 card->cid.prod_name[0] = UNSTUFF_BITS(resp, 96, 8); 94 card->cid.prod_name[1] = UNSTUFF_BITS(resp, 88, 8); 95 card->cid.prod_name[2] = UNSTUFF_BITS(resp, 80, 8); 96 card->cid.prod_name[3] = UNSTUFF_BITS(resp, 72, 8); 97 card->cid.prod_name[4] = UNSTUFF_BITS(resp, 64, 8); 98 card->cid.prod_name[5] = UNSTUFF_BITS(resp, 56, 8); 99 card->cid.serial = UNSTUFF_BITS(resp, 16, 32); 100 card->cid.month = UNSTUFF_BITS(resp, 12, 4); 101 card->cid.year = UNSTUFF_BITS(resp, 8, 4) + 1997; 102 break; 103 104 default: 105 pr_err("%s: card has unknown MMCA version %d\n", 106 mmc_hostname(card->host), card->csd.mmca_vsn); 107 return -EINVAL; 108 } 109 110 return 0; 111 } 112 113 static void mmc_set_erase_size(struct mmc_card *card) 114 { 115 if (card->ext_csd.erase_group_def & 1) 116 card->erase_size = card->ext_csd.hc_erase_size; 117 else 118 card->erase_size = card->csd.erase_size; 119 120 mmc_init_erase(card); 121 } 122 123 /* 124 * Given a 128-bit response, decode to our card CSD structure. 125 */ 126 static int mmc_decode_csd(struct mmc_card *card) 127 { 128 struct mmc_csd *csd = &card->csd; 129 unsigned int e, m, a, b; 130 u32 *resp = card->raw_csd; 131 132 /* 133 * We only understand CSD structure v1.1 and v1.2. 134 * v1.2 has extra information in bits 15, 11 and 10. 135 * We also support eMMC v4.4 & v4.41. 136 */ 137 csd->structure = UNSTUFF_BITS(resp, 126, 2); 138 if (csd->structure == 0) { 139 pr_err("%s: unrecognised CSD structure version %d\n", 140 mmc_hostname(card->host), csd->structure); 141 return -EINVAL; 142 } 143 144 csd->mmca_vsn = UNSTUFF_BITS(resp, 122, 4); 145 m = UNSTUFF_BITS(resp, 115, 4); 146 e = UNSTUFF_BITS(resp, 112, 3); 147 csd->tacc_ns = (tacc_exp[e] * tacc_mant[m] + 9) / 10; 148 csd->tacc_clks = UNSTUFF_BITS(resp, 104, 8) * 100; 149 150 m = UNSTUFF_BITS(resp, 99, 4); 151 e = UNSTUFF_BITS(resp, 96, 3); 152 csd->max_dtr = tran_exp[e] * tran_mant[m]; 153 csd->cmdclass = UNSTUFF_BITS(resp, 84, 12); 154 155 e = UNSTUFF_BITS(resp, 47, 3); 156 m = UNSTUFF_BITS(resp, 62, 12); 157 csd->capacity = (1 + m) << (e + 2); 158 159 csd->read_blkbits = UNSTUFF_BITS(resp, 80, 4); 160 csd->read_partial = UNSTUFF_BITS(resp, 79, 1); 161 csd->write_misalign = UNSTUFF_BITS(resp, 78, 1); 162 csd->read_misalign = UNSTUFF_BITS(resp, 77, 1); 163 csd->r2w_factor = UNSTUFF_BITS(resp, 26, 3); 164 csd->write_blkbits = UNSTUFF_BITS(resp, 22, 4); 165 csd->write_partial = UNSTUFF_BITS(resp, 21, 1); 166 167 if (csd->write_blkbits >= 9) { 168 a = UNSTUFF_BITS(resp, 42, 5); 169 b = UNSTUFF_BITS(resp, 37, 5); 170 csd->erase_size = (a + 1) * (b + 1); 171 csd->erase_size <<= csd->write_blkbits - 9; 172 } 173 174 return 0; 175 } 176 177 /* 178 * Read extended CSD. 179 */ 180 static int mmc_get_ext_csd(struct mmc_card *card, u8 **new_ext_csd) 181 { 182 int err; 183 u8 *ext_csd; 184 185 BUG_ON(!card); 186 BUG_ON(!new_ext_csd); 187 188 *new_ext_csd = NULL; 189 190 if (card->csd.mmca_vsn < CSD_SPEC_VER_4) 191 return 0; 192 193 /* 194 * As the ext_csd is so large and mostly unused, we don't store the 195 * raw block in mmc_card. 196 */ 197 ext_csd = kmalloc(512, GFP_KERNEL); 198 if (!ext_csd) { 199 pr_err("%s: could not allocate a buffer to " 200 "receive the ext_csd.\n", mmc_hostname(card->host)); 201 return -ENOMEM; 202 } 203 204 err = mmc_send_ext_csd(card, ext_csd); 205 if (err) { 206 kfree(ext_csd); 207 *new_ext_csd = NULL; 208 209 /* If the host or the card can't do the switch, 210 * fail more gracefully. */ 211 if ((err != -EINVAL) 212 && (err != -ENOSYS) 213 && (err != -EFAULT)) 214 return err; 215 216 /* 217 * High capacity cards should have this "magic" size 218 * stored in their CSD. 219 */ 220 if (card->csd.capacity == (4096 * 512)) { 221 pr_err("%s: unable to read EXT_CSD " 222 "on a possible high capacity card. " 223 "Card will be ignored.\n", 224 mmc_hostname(card->host)); 225 } else { 226 pr_warning("%s: unable to read " 227 "EXT_CSD, performance might " 228 "suffer.\n", 229 mmc_hostname(card->host)); 230 err = 0; 231 } 232 } else 233 *new_ext_csd = ext_csd; 234 235 return err; 236 } 237 238 /* 239 * Decode extended CSD. 240 */ 241 static int mmc_read_ext_csd(struct mmc_card *card, u8 *ext_csd) 242 { 243 int err = 0, idx; 244 unsigned int part_size; 245 u8 hc_erase_grp_sz = 0, hc_wp_grp_sz = 0; 246 247 BUG_ON(!card); 248 249 if (!ext_csd) 250 return 0; 251 252 /* Version is coded in the CSD_STRUCTURE byte in the EXT_CSD register */ 253 card->ext_csd.raw_ext_csd_structure = ext_csd[EXT_CSD_STRUCTURE]; 254 if (card->csd.structure == 3) { 255 if (card->ext_csd.raw_ext_csd_structure > 2) { 256 pr_err("%s: unrecognised EXT_CSD structure " 257 "version %d\n", mmc_hostname(card->host), 258 card->ext_csd.raw_ext_csd_structure); 259 err = -EINVAL; 260 goto out; 261 } 262 } 263 264 card->ext_csd.rev = ext_csd[EXT_CSD_REV]; 265 if (card->ext_csd.rev > 6) { 266 pr_err("%s: unrecognised EXT_CSD revision %d\n", 267 mmc_hostname(card->host), card->ext_csd.rev); 268 err = -EINVAL; 269 goto out; 270 } 271 272 card->ext_csd.raw_sectors[0] = ext_csd[EXT_CSD_SEC_CNT + 0]; 273 card->ext_csd.raw_sectors[1] = ext_csd[EXT_CSD_SEC_CNT + 1]; 274 card->ext_csd.raw_sectors[2] = ext_csd[EXT_CSD_SEC_CNT + 2]; 275 card->ext_csd.raw_sectors[3] = ext_csd[EXT_CSD_SEC_CNT + 3]; 276 if (card->ext_csd.rev >= 2) { 277 card->ext_csd.sectors = 278 ext_csd[EXT_CSD_SEC_CNT + 0] << 0 | 279 ext_csd[EXT_CSD_SEC_CNT + 1] << 8 | 280 ext_csd[EXT_CSD_SEC_CNT + 2] << 16 | 281 ext_csd[EXT_CSD_SEC_CNT + 3] << 24; 282 283 /* Cards with density > 2GiB are sector addressed */ 284 if (card->ext_csd.sectors > (2u * 1024 * 1024 * 1024) / 512) 285 mmc_card_set_blockaddr(card); 286 } 287 card->ext_csd.raw_card_type = ext_csd[EXT_CSD_CARD_TYPE]; 288 switch (ext_csd[EXT_CSD_CARD_TYPE] & EXT_CSD_CARD_TYPE_MASK) { 289 case EXT_CSD_CARD_TYPE_DDR_52 | EXT_CSD_CARD_TYPE_52 | 290 EXT_CSD_CARD_TYPE_26: 291 card->ext_csd.hs_max_dtr = 52000000; 292 card->ext_csd.card_type = EXT_CSD_CARD_TYPE_DDR_52; 293 break; 294 case EXT_CSD_CARD_TYPE_DDR_1_2V | EXT_CSD_CARD_TYPE_52 | 295 EXT_CSD_CARD_TYPE_26: 296 card->ext_csd.hs_max_dtr = 52000000; 297 card->ext_csd.card_type = EXT_CSD_CARD_TYPE_DDR_1_2V; 298 break; 299 case EXT_CSD_CARD_TYPE_DDR_1_8V | EXT_CSD_CARD_TYPE_52 | 300 EXT_CSD_CARD_TYPE_26: 301 card->ext_csd.hs_max_dtr = 52000000; 302 card->ext_csd.card_type = EXT_CSD_CARD_TYPE_DDR_1_8V; 303 break; 304 case EXT_CSD_CARD_TYPE_52 | EXT_CSD_CARD_TYPE_26: 305 card->ext_csd.hs_max_dtr = 52000000; 306 break; 307 case EXT_CSD_CARD_TYPE_26: 308 card->ext_csd.hs_max_dtr = 26000000; 309 break; 310 default: 311 /* MMC v4 spec says this cannot happen */ 312 pr_warning("%s: card is mmc v4 but doesn't " 313 "support any high-speed modes.\n", 314 mmc_hostname(card->host)); 315 } 316 317 card->ext_csd.raw_s_a_timeout = ext_csd[EXT_CSD_S_A_TIMEOUT]; 318 card->ext_csd.raw_erase_timeout_mult = 319 ext_csd[EXT_CSD_ERASE_TIMEOUT_MULT]; 320 card->ext_csd.raw_hc_erase_grp_size = 321 ext_csd[EXT_CSD_HC_ERASE_GRP_SIZE]; 322 if (card->ext_csd.rev >= 3) { 323 u8 sa_shift = ext_csd[EXT_CSD_S_A_TIMEOUT]; 324 card->ext_csd.part_config = ext_csd[EXT_CSD_PART_CONFIG]; 325 326 /* EXT_CSD value is in units of 10ms, but we store in ms */ 327 card->ext_csd.part_time = 10 * ext_csd[EXT_CSD_PART_SWITCH_TIME]; 328 329 /* Sleep / awake timeout in 100ns units */ 330 if (sa_shift > 0 && sa_shift <= 0x17) 331 card->ext_csd.sa_timeout = 332 1 << ext_csd[EXT_CSD_S_A_TIMEOUT]; 333 card->ext_csd.erase_group_def = 334 ext_csd[EXT_CSD_ERASE_GROUP_DEF]; 335 card->ext_csd.hc_erase_timeout = 300 * 336 ext_csd[EXT_CSD_ERASE_TIMEOUT_MULT]; 337 card->ext_csd.hc_erase_size = 338 ext_csd[EXT_CSD_HC_ERASE_GRP_SIZE] << 10; 339 340 card->ext_csd.rel_sectors = ext_csd[EXT_CSD_REL_WR_SEC_C]; 341 342 /* 343 * There are two boot regions of equal size, defined in 344 * multiples of 128K. 345 */ 346 if (ext_csd[EXT_CSD_BOOT_MULT] && mmc_boot_partition_access(card->host)) { 347 for (idx = 0; idx < MMC_NUM_BOOT_PARTITION; idx++) { 348 part_size = ext_csd[EXT_CSD_BOOT_MULT] << 17; 349 mmc_part_add(card, part_size, 350 EXT_CSD_PART_CONFIG_ACC_BOOT0 + idx, 351 "boot%d", idx, true, 352 MMC_BLK_DATA_AREA_BOOT); 353 } 354 } 355 } 356 357 card->ext_csd.raw_hc_erase_gap_size = 358 ext_csd[EXT_CSD_PARTITION_ATTRIBUTE]; 359 card->ext_csd.raw_sec_trim_mult = 360 ext_csd[EXT_CSD_SEC_TRIM_MULT]; 361 card->ext_csd.raw_sec_erase_mult = 362 ext_csd[EXT_CSD_SEC_ERASE_MULT]; 363 card->ext_csd.raw_sec_feature_support = 364 ext_csd[EXT_CSD_SEC_FEATURE_SUPPORT]; 365 card->ext_csd.raw_trim_mult = 366 ext_csd[EXT_CSD_TRIM_MULT]; 367 if (card->ext_csd.rev >= 4) { 368 /* 369 * Enhanced area feature support -- check whether the eMMC 370 * card has the Enhanced area enabled. If so, export enhanced 371 * area offset and size to user by adding sysfs interface. 372 */ 373 card->ext_csd.raw_partition_support = ext_csd[EXT_CSD_PARTITION_SUPPORT]; 374 if ((ext_csd[EXT_CSD_PARTITION_SUPPORT] & 0x2) && 375 (ext_csd[EXT_CSD_PARTITION_ATTRIBUTE] & 0x1)) { 376 hc_erase_grp_sz = 377 ext_csd[EXT_CSD_HC_ERASE_GRP_SIZE]; 378 hc_wp_grp_sz = 379 ext_csd[EXT_CSD_HC_WP_GRP_SIZE]; 380 381 card->ext_csd.enhanced_area_en = 1; 382 /* 383 * calculate the enhanced data area offset, in bytes 384 */ 385 card->ext_csd.enhanced_area_offset = 386 (ext_csd[139] << 24) + (ext_csd[138] << 16) + 387 (ext_csd[137] << 8) + ext_csd[136]; 388 if (mmc_card_blockaddr(card)) 389 card->ext_csd.enhanced_area_offset <<= 9; 390 /* 391 * calculate the enhanced data area size, in kilobytes 392 */ 393 card->ext_csd.enhanced_area_size = 394 (ext_csd[142] << 16) + (ext_csd[141] << 8) + 395 ext_csd[140]; 396 card->ext_csd.enhanced_area_size *= 397 (size_t)(hc_erase_grp_sz * hc_wp_grp_sz); 398 card->ext_csd.enhanced_area_size <<= 9; 399 } else { 400 /* 401 * If the enhanced area is not enabled, disable these 402 * device attributes. 403 */ 404 card->ext_csd.enhanced_area_offset = -EINVAL; 405 card->ext_csd.enhanced_area_size = -EINVAL; 406 } 407 408 /* 409 * General purpose partition feature support -- 410 * If ext_csd has the size of general purpose partitions, 411 * set size, part_cfg, partition name in mmc_part. 412 */ 413 if (ext_csd[EXT_CSD_PARTITION_SUPPORT] & 414 EXT_CSD_PART_SUPPORT_PART_EN) { 415 if (card->ext_csd.enhanced_area_en != 1) { 416 hc_erase_grp_sz = 417 ext_csd[EXT_CSD_HC_ERASE_GRP_SIZE]; 418 hc_wp_grp_sz = 419 ext_csd[EXT_CSD_HC_WP_GRP_SIZE]; 420 421 card->ext_csd.enhanced_area_en = 1; 422 } 423 424 for (idx = 0; idx < MMC_NUM_GP_PARTITION; idx++) { 425 if (!ext_csd[EXT_CSD_GP_SIZE_MULT + idx * 3] && 426 !ext_csd[EXT_CSD_GP_SIZE_MULT + idx * 3 + 1] && 427 !ext_csd[EXT_CSD_GP_SIZE_MULT + idx * 3 + 2]) 428 continue; 429 part_size = 430 (ext_csd[EXT_CSD_GP_SIZE_MULT + idx * 3 + 2] 431 << 16) + 432 (ext_csd[EXT_CSD_GP_SIZE_MULT + idx * 3 + 1] 433 << 8) + 434 ext_csd[EXT_CSD_GP_SIZE_MULT + idx * 3]; 435 part_size *= (size_t)(hc_erase_grp_sz * 436 hc_wp_grp_sz); 437 mmc_part_add(card, part_size << 19, 438 EXT_CSD_PART_CONFIG_ACC_GP0 + idx, 439 "gp%d", idx, false, 440 MMC_BLK_DATA_AREA_GP); 441 } 442 } 443 card->ext_csd.sec_trim_mult = 444 ext_csd[EXT_CSD_SEC_TRIM_MULT]; 445 card->ext_csd.sec_erase_mult = 446 ext_csd[EXT_CSD_SEC_ERASE_MULT]; 447 card->ext_csd.sec_feature_support = 448 ext_csd[EXT_CSD_SEC_FEATURE_SUPPORT]; 449 card->ext_csd.trim_timeout = 300 * 450 ext_csd[EXT_CSD_TRIM_MULT]; 451 452 /* 453 * Note that the call to mmc_part_add above defaults to read 454 * only. If this default assumption is changed, the call must 455 * take into account the value of boot_locked below. 456 */ 457 card->ext_csd.boot_ro_lock = ext_csd[EXT_CSD_BOOT_WP]; 458 card->ext_csd.boot_ro_lockable = true; 459 } 460 461 if (card->ext_csd.rev >= 5) { 462 /* check whether the eMMC card supports HPI */ 463 if (ext_csd[EXT_CSD_HPI_FEATURES] & 0x1) { 464 card->ext_csd.hpi = 1; 465 if (ext_csd[EXT_CSD_HPI_FEATURES] & 0x2) 466 card->ext_csd.hpi_cmd = MMC_STOP_TRANSMISSION; 467 else 468 card->ext_csd.hpi_cmd = MMC_SEND_STATUS; 469 /* 470 * Indicate the maximum timeout to close 471 * a command interrupted by HPI 472 */ 473 card->ext_csd.out_of_int_time = 474 ext_csd[EXT_CSD_OUT_OF_INTERRUPT_TIME] * 10; 475 } 476 477 card->ext_csd.rel_param = ext_csd[EXT_CSD_WR_REL_PARAM]; 478 card->ext_csd.rst_n_function = ext_csd[EXT_CSD_RST_N_FUNCTION]; 479 } 480 481 card->ext_csd.raw_erased_mem_count = ext_csd[EXT_CSD_ERASED_MEM_CONT]; 482 if (ext_csd[EXT_CSD_ERASED_MEM_CONT]) 483 card->erased_byte = 0xFF; 484 else 485 card->erased_byte = 0x0; 486 487 /* eMMC v4.5 or later */ 488 if (card->ext_csd.rev >= 6) { 489 card->ext_csd.feature_support |= MMC_DISCARD_FEATURE; 490 491 card->ext_csd.generic_cmd6_time = 10 * 492 ext_csd[EXT_CSD_GENERIC_CMD6_TIME]; 493 card->ext_csd.power_off_longtime = 10 * 494 ext_csd[EXT_CSD_POWER_OFF_LONG_TIME]; 495 496 card->ext_csd.cache_size = 497 ext_csd[EXT_CSD_CACHE_SIZE + 0] << 0 | 498 ext_csd[EXT_CSD_CACHE_SIZE + 1] << 8 | 499 ext_csd[EXT_CSD_CACHE_SIZE + 2] << 16 | 500 ext_csd[EXT_CSD_CACHE_SIZE + 3] << 24; 501 } 502 503 out: 504 return err; 505 } 506 507 static inline void mmc_free_ext_csd(u8 *ext_csd) 508 { 509 kfree(ext_csd); 510 } 511 512 513 static int mmc_compare_ext_csds(struct mmc_card *card, unsigned bus_width) 514 { 515 u8 *bw_ext_csd; 516 int err; 517 518 if (bus_width == MMC_BUS_WIDTH_1) 519 return 0; 520 521 err = mmc_get_ext_csd(card, &bw_ext_csd); 522 523 if (err || bw_ext_csd == NULL) { 524 if (bus_width != MMC_BUS_WIDTH_1) 525 err = -EINVAL; 526 goto out; 527 } 528 529 if (bus_width == MMC_BUS_WIDTH_1) 530 goto out; 531 532 /* only compare read only fields */ 533 err = (!(card->ext_csd.raw_partition_support == 534 bw_ext_csd[EXT_CSD_PARTITION_SUPPORT]) && 535 (card->ext_csd.raw_erased_mem_count == 536 bw_ext_csd[EXT_CSD_ERASED_MEM_CONT]) && 537 (card->ext_csd.rev == 538 bw_ext_csd[EXT_CSD_REV]) && 539 (card->ext_csd.raw_ext_csd_structure == 540 bw_ext_csd[EXT_CSD_STRUCTURE]) && 541 (card->ext_csd.raw_card_type == 542 bw_ext_csd[EXT_CSD_CARD_TYPE]) && 543 (card->ext_csd.raw_s_a_timeout == 544 bw_ext_csd[EXT_CSD_S_A_TIMEOUT]) && 545 (card->ext_csd.raw_hc_erase_gap_size == 546 bw_ext_csd[EXT_CSD_HC_WP_GRP_SIZE]) && 547 (card->ext_csd.raw_erase_timeout_mult == 548 bw_ext_csd[EXT_CSD_ERASE_TIMEOUT_MULT]) && 549 (card->ext_csd.raw_hc_erase_grp_size == 550 bw_ext_csd[EXT_CSD_HC_ERASE_GRP_SIZE]) && 551 (card->ext_csd.raw_sec_trim_mult == 552 bw_ext_csd[EXT_CSD_SEC_TRIM_MULT]) && 553 (card->ext_csd.raw_sec_erase_mult == 554 bw_ext_csd[EXT_CSD_SEC_ERASE_MULT]) && 555 (card->ext_csd.raw_sec_feature_support == 556 bw_ext_csd[EXT_CSD_SEC_FEATURE_SUPPORT]) && 557 (card->ext_csd.raw_trim_mult == 558 bw_ext_csd[EXT_CSD_TRIM_MULT]) && 559 (card->ext_csd.raw_sectors[0] == 560 bw_ext_csd[EXT_CSD_SEC_CNT + 0]) && 561 (card->ext_csd.raw_sectors[1] == 562 bw_ext_csd[EXT_CSD_SEC_CNT + 1]) && 563 (card->ext_csd.raw_sectors[2] == 564 bw_ext_csd[EXT_CSD_SEC_CNT + 2]) && 565 (card->ext_csd.raw_sectors[3] == 566 bw_ext_csd[EXT_CSD_SEC_CNT + 3])); 567 if (err) 568 err = -EINVAL; 569 570 out: 571 mmc_free_ext_csd(bw_ext_csd); 572 return err; 573 } 574 575 MMC_DEV_ATTR(cid, "%08x%08x%08x%08x\n", card->raw_cid[0], card->raw_cid[1], 576 card->raw_cid[2], card->raw_cid[3]); 577 MMC_DEV_ATTR(csd, "%08x%08x%08x%08x\n", card->raw_csd[0], card->raw_csd[1], 578 card->raw_csd[2], card->raw_csd[3]); 579 MMC_DEV_ATTR(date, "%02d/%04d\n", card->cid.month, card->cid.year); 580 MMC_DEV_ATTR(erase_size, "%u\n", card->erase_size << 9); 581 MMC_DEV_ATTR(preferred_erase_size, "%u\n", card->pref_erase << 9); 582 MMC_DEV_ATTR(fwrev, "0x%x\n", card->cid.fwrev); 583 MMC_DEV_ATTR(hwrev, "0x%x\n", card->cid.hwrev); 584 MMC_DEV_ATTR(manfid, "0x%06x\n", card->cid.manfid); 585 MMC_DEV_ATTR(name, "%s\n", card->cid.prod_name); 586 MMC_DEV_ATTR(oemid, "0x%04x\n", card->cid.oemid); 587 MMC_DEV_ATTR(serial, "0x%08x\n", card->cid.serial); 588 MMC_DEV_ATTR(enhanced_area_offset, "%llu\n", 589 card->ext_csd.enhanced_area_offset); 590 MMC_DEV_ATTR(enhanced_area_size, "%u\n", card->ext_csd.enhanced_area_size); 591 592 static struct attribute *mmc_std_attrs[] = { 593 &dev_attr_cid.attr, 594 &dev_attr_csd.attr, 595 &dev_attr_date.attr, 596 &dev_attr_erase_size.attr, 597 &dev_attr_preferred_erase_size.attr, 598 &dev_attr_fwrev.attr, 599 &dev_attr_hwrev.attr, 600 &dev_attr_manfid.attr, 601 &dev_attr_name.attr, 602 &dev_attr_oemid.attr, 603 &dev_attr_serial.attr, 604 &dev_attr_enhanced_area_offset.attr, 605 &dev_attr_enhanced_area_size.attr, 606 NULL, 607 }; 608 609 static struct attribute_group mmc_std_attr_group = { 610 .attrs = mmc_std_attrs, 611 }; 612 613 static const struct attribute_group *mmc_attr_groups[] = { 614 &mmc_std_attr_group, 615 NULL, 616 }; 617 618 static struct device_type mmc_type = { 619 .groups = mmc_attr_groups, 620 }; 621 622 /* 623 * Select the PowerClass for the current bus width 624 * If power class is defined for 4/8 bit bus in the 625 * extended CSD register, select it by executing the 626 * mmc_switch command. 627 */ 628 static int mmc_select_powerclass(struct mmc_card *card, 629 unsigned int bus_width, u8 *ext_csd) 630 { 631 int err = 0; 632 unsigned int pwrclass_val; 633 unsigned int index = 0; 634 struct mmc_host *host; 635 636 BUG_ON(!card); 637 638 host = card->host; 639 BUG_ON(!host); 640 641 if (ext_csd == NULL) 642 return 0; 643 644 /* Power class selection is supported for versions >= 4.0 */ 645 if (card->csd.mmca_vsn < CSD_SPEC_VER_4) 646 return 0; 647 648 /* Power class values are defined only for 4/8 bit bus */ 649 if (bus_width == EXT_CSD_BUS_WIDTH_1) 650 return 0; 651 652 switch (1 << host->ios.vdd) { 653 case MMC_VDD_165_195: 654 if (host->ios.clock <= 26000000) 655 index = EXT_CSD_PWR_CL_26_195; 656 else if (host->ios.clock <= 52000000) 657 index = (bus_width <= EXT_CSD_BUS_WIDTH_8) ? 658 EXT_CSD_PWR_CL_52_195 : 659 EXT_CSD_PWR_CL_DDR_52_195; 660 else if (host->ios.clock <= 200000000) 661 index = EXT_CSD_PWR_CL_200_195; 662 break; 663 case MMC_VDD_32_33: 664 case MMC_VDD_33_34: 665 case MMC_VDD_34_35: 666 case MMC_VDD_35_36: 667 if (host->ios.clock <= 26000000) 668 index = EXT_CSD_PWR_CL_26_360; 669 else if (host->ios.clock <= 52000000) 670 index = (bus_width <= EXT_CSD_BUS_WIDTH_8) ? 671 EXT_CSD_PWR_CL_52_360 : 672 EXT_CSD_PWR_CL_DDR_52_360; 673 else if (host->ios.clock <= 200000000) 674 index = EXT_CSD_PWR_CL_200_360; 675 break; 676 default: 677 pr_warning("%s: Voltage range not supported " 678 "for power class.\n", mmc_hostname(host)); 679 return -EINVAL; 680 } 681 682 pwrclass_val = ext_csd[index]; 683 684 if (bus_width & (EXT_CSD_BUS_WIDTH_8 | EXT_CSD_DDR_BUS_WIDTH_8)) 685 pwrclass_val = (pwrclass_val & EXT_CSD_PWR_CL_8BIT_MASK) >> 686 EXT_CSD_PWR_CL_8BIT_SHIFT; 687 else 688 pwrclass_val = (pwrclass_val & EXT_CSD_PWR_CL_4BIT_MASK) >> 689 EXT_CSD_PWR_CL_4BIT_SHIFT; 690 691 /* If the power class is different from the default value */ 692 if (pwrclass_val > 0) { 693 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL, 694 EXT_CSD_POWER_CLASS, 695 pwrclass_val, 696 card->ext_csd.generic_cmd6_time); 697 } 698 699 return err; 700 } 701 702 /* 703 * Handle the detection and initialisation of a card. 704 * 705 * In the case of a resume, "oldcard" will contain the card 706 * we're trying to reinitialise. 707 */ 708 static int mmc_init_card(struct mmc_host *host, u32 ocr, 709 struct mmc_card *oldcard) 710 { 711 struct mmc_card *card; 712 int err, ddr = 0; 713 u32 cid[4]; 714 unsigned int max_dtr; 715 u32 rocr; 716 u8 *ext_csd = NULL; 717 718 BUG_ON(!host); 719 WARN_ON(!host->claimed); 720 721 /* Set correct bus mode for MMC before attempting init */ 722 if (!mmc_host_is_spi(host)) 723 mmc_set_bus_mode(host, MMC_BUSMODE_OPENDRAIN); 724 725 /* 726 * Since we're changing the OCR value, we seem to 727 * need to tell some cards to go back to the idle 728 * state. We wait 1ms to give cards time to 729 * respond. 730 * mmc_go_idle is needed for eMMC that are asleep 731 */ 732 mmc_go_idle(host); 733 734 /* The extra bit indicates that we support high capacity */ 735 err = mmc_send_op_cond(host, ocr | (1 << 30), &rocr); 736 if (err) 737 goto err; 738 739 /* 740 * For SPI, enable CRC as appropriate. 741 */ 742 if (mmc_host_is_spi(host)) { 743 err = mmc_spi_set_crc(host, use_spi_crc); 744 if (err) 745 goto err; 746 } 747 748 /* 749 * Fetch CID from card. 750 */ 751 if (mmc_host_is_spi(host)) 752 err = mmc_send_cid(host, cid); 753 else 754 err = mmc_all_send_cid(host, cid); 755 if (err) 756 goto err; 757 758 if (oldcard) { 759 if (memcmp(cid, oldcard->raw_cid, sizeof(cid)) != 0) { 760 err = -ENOENT; 761 goto err; 762 } 763 764 card = oldcard; 765 } else { 766 /* 767 * Allocate card structure. 768 */ 769 card = mmc_alloc_card(host, &mmc_type); 770 if (IS_ERR(card)) { 771 err = PTR_ERR(card); 772 goto err; 773 } 774 775 card->type = MMC_TYPE_MMC; 776 card->rca = 1; 777 memcpy(card->raw_cid, cid, sizeof(card->raw_cid)); 778 } 779 780 /* 781 * For native busses: set card RCA and quit open drain mode. 782 */ 783 if (!mmc_host_is_spi(host)) { 784 err = mmc_set_relative_addr(card); 785 if (err) 786 goto free_card; 787 788 mmc_set_bus_mode(host, MMC_BUSMODE_PUSHPULL); 789 } 790 791 if (!oldcard) { 792 /* 793 * Fetch CSD from card. 794 */ 795 err = mmc_send_csd(card, card->raw_csd); 796 if (err) 797 goto free_card; 798 799 err = mmc_decode_csd(card); 800 if (err) 801 goto free_card; 802 err = mmc_decode_cid(card); 803 if (err) 804 goto free_card; 805 } 806 807 /* 808 * Select card, as all following commands rely on that. 809 */ 810 if (!mmc_host_is_spi(host)) { 811 err = mmc_select_card(card); 812 if (err) 813 goto free_card; 814 } 815 816 if (!oldcard) { 817 /* 818 * Fetch and process extended CSD. 819 */ 820 821 err = mmc_get_ext_csd(card, &ext_csd); 822 if (err) 823 goto free_card; 824 err = mmc_read_ext_csd(card, ext_csd); 825 if (err) 826 goto free_card; 827 828 /* If doing byte addressing, check if required to do sector 829 * addressing. Handle the case of <2GB cards needing sector 830 * addressing. See section 8.1 JEDEC Standard JED84-A441; 831 * ocr register has bit 30 set for sector addressing. 832 */ 833 if (!(mmc_card_blockaddr(card)) && (rocr & (1<<30))) 834 mmc_card_set_blockaddr(card); 835 836 /* Erase size depends on CSD and Extended CSD */ 837 mmc_set_erase_size(card); 838 } 839 840 /* 841 * If enhanced_area_en is TRUE, host needs to enable ERASE_GRP_DEF 842 * bit. This bit will be lost every time after a reset or power off. 843 */ 844 if (card->ext_csd.enhanced_area_en) { 845 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL, 846 EXT_CSD_ERASE_GROUP_DEF, 1, 847 card->ext_csd.generic_cmd6_time); 848 849 if (err && err != -EBADMSG) 850 goto free_card; 851 852 if (err) { 853 err = 0; 854 /* 855 * Just disable enhanced area off & sz 856 * will try to enable ERASE_GROUP_DEF 857 * during next time reinit 858 */ 859 card->ext_csd.enhanced_area_offset = -EINVAL; 860 card->ext_csd.enhanced_area_size = -EINVAL; 861 } else { 862 card->ext_csd.erase_group_def = 1; 863 /* 864 * enable ERASE_GRP_DEF successfully. 865 * This will affect the erase size, so 866 * here need to reset erase size 867 */ 868 mmc_set_erase_size(card); 869 } 870 } 871 872 /* 873 * Ensure eMMC user default partition is enabled 874 */ 875 if (card->ext_csd.part_config & EXT_CSD_PART_CONFIG_ACC_MASK) { 876 card->ext_csd.part_config &= ~EXT_CSD_PART_CONFIG_ACC_MASK; 877 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL, EXT_CSD_PART_CONFIG, 878 card->ext_csd.part_config, 879 card->ext_csd.part_time); 880 if (err && err != -EBADMSG) 881 goto free_card; 882 } 883 884 /* 885 * If the host supports the power_off_notify capability then 886 * set the notification byte in the ext_csd register of device 887 */ 888 if ((host->caps2 & MMC_CAP2_POWEROFF_NOTIFY) && 889 (card->ext_csd.rev >= 6)) { 890 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL, 891 EXT_CSD_POWER_OFF_NOTIFICATION, 892 EXT_CSD_POWER_ON, 893 card->ext_csd.generic_cmd6_time); 894 if (err && err != -EBADMSG) 895 goto free_card; 896 897 /* 898 * The err can be -EBADMSG or 0, 899 * so check for success and update the flag 900 */ 901 if (!err) 902 card->poweroff_notify_state = MMC_POWERED_ON; 903 } 904 905 /* 906 * Activate high speed (if supported) 907 */ 908 if ((card->ext_csd.hs_max_dtr != 0) && 909 (host->caps & MMC_CAP_MMC_HIGHSPEED)) { 910 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL, 911 EXT_CSD_HS_TIMING, 1, 912 card->ext_csd.generic_cmd6_time); 913 if (err && err != -EBADMSG) 914 goto free_card; 915 916 if (err) { 917 pr_warning("%s: switch to highspeed failed\n", 918 mmc_hostname(card->host)); 919 err = 0; 920 } else { 921 mmc_card_set_highspeed(card); 922 mmc_set_timing(card->host, MMC_TIMING_MMC_HS); 923 } 924 } 925 926 /* 927 * Enable HPI feature (if supported) 928 */ 929 if (card->ext_csd.hpi) { 930 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL, 931 EXT_CSD_HPI_MGMT, 1, 0); 932 if (err && err != -EBADMSG) 933 goto free_card; 934 if (err) { 935 pr_warning("%s: Enabling HPI failed\n", 936 mmc_hostname(card->host)); 937 err = 0; 938 } else 939 card->ext_csd.hpi_en = 1; 940 } 941 942 /* 943 * Compute bus speed. 944 */ 945 max_dtr = (unsigned int)-1; 946 947 if (mmc_card_highspeed(card)) { 948 if (max_dtr > card->ext_csd.hs_max_dtr) 949 max_dtr = card->ext_csd.hs_max_dtr; 950 } else if (max_dtr > card->csd.max_dtr) { 951 max_dtr = card->csd.max_dtr; 952 } 953 954 mmc_set_clock(host, max_dtr); 955 956 /* 957 * Indicate DDR mode (if supported). 958 */ 959 if (mmc_card_highspeed(card)) { 960 if ((card->ext_csd.card_type & EXT_CSD_CARD_TYPE_DDR_1_8V) 961 && ((host->caps & (MMC_CAP_1_8V_DDR | 962 MMC_CAP_UHS_DDR50)) 963 == (MMC_CAP_1_8V_DDR | MMC_CAP_UHS_DDR50))) 964 ddr = MMC_1_8V_DDR_MODE; 965 else if ((card->ext_csd.card_type & EXT_CSD_CARD_TYPE_DDR_1_2V) 966 && ((host->caps & (MMC_CAP_1_2V_DDR | 967 MMC_CAP_UHS_DDR50)) 968 == (MMC_CAP_1_2V_DDR | MMC_CAP_UHS_DDR50))) 969 ddr = MMC_1_2V_DDR_MODE; 970 } 971 972 /* 973 * Activate wide bus and DDR (if supported). 974 */ 975 if ((card->csd.mmca_vsn >= CSD_SPEC_VER_4) && 976 (host->caps & (MMC_CAP_4_BIT_DATA | MMC_CAP_8_BIT_DATA))) { 977 static unsigned ext_csd_bits[][2] = { 978 { EXT_CSD_BUS_WIDTH_8, EXT_CSD_DDR_BUS_WIDTH_8 }, 979 { EXT_CSD_BUS_WIDTH_4, EXT_CSD_DDR_BUS_WIDTH_4 }, 980 { EXT_CSD_BUS_WIDTH_1, EXT_CSD_BUS_WIDTH_1 }, 981 }; 982 static unsigned bus_widths[] = { 983 MMC_BUS_WIDTH_8, 984 MMC_BUS_WIDTH_4, 985 MMC_BUS_WIDTH_1 986 }; 987 unsigned idx, bus_width = 0; 988 989 if (host->caps & MMC_CAP_8_BIT_DATA) 990 idx = 0; 991 else 992 idx = 1; 993 for (; idx < ARRAY_SIZE(bus_widths); idx++) { 994 bus_width = bus_widths[idx]; 995 if (bus_width == MMC_BUS_WIDTH_1) 996 ddr = 0; /* no DDR for 1-bit width */ 997 err = mmc_select_powerclass(card, ext_csd_bits[idx][0], 998 ext_csd); 999 if (err) 1000 pr_err("%s: power class selection to " 1001 "bus width %d failed\n", 1002 mmc_hostname(card->host), 1003 1 << bus_width); 1004 1005 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL, 1006 EXT_CSD_BUS_WIDTH, 1007 ext_csd_bits[idx][0], 1008 card->ext_csd.generic_cmd6_time); 1009 if (!err) { 1010 mmc_set_bus_width(card->host, bus_width); 1011 1012 /* 1013 * If controller can't handle bus width test, 1014 * compare ext_csd previously read in 1 bit mode 1015 * against ext_csd at new bus width 1016 */ 1017 if (!(host->caps & MMC_CAP_BUS_WIDTH_TEST)) 1018 err = mmc_compare_ext_csds(card, 1019 bus_width); 1020 else 1021 err = mmc_bus_test(card, bus_width); 1022 if (!err) 1023 break; 1024 } 1025 } 1026 1027 if (!err && ddr) { 1028 err = mmc_select_powerclass(card, ext_csd_bits[idx][1], 1029 ext_csd); 1030 if (err) 1031 pr_err("%s: power class selection to " 1032 "bus width %d ddr %d failed\n", 1033 mmc_hostname(card->host), 1034 1 << bus_width, ddr); 1035 1036 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL, 1037 EXT_CSD_BUS_WIDTH, 1038 ext_csd_bits[idx][1], 1039 card->ext_csd.generic_cmd6_time); 1040 } 1041 if (err) { 1042 pr_warning("%s: switch to bus width %d ddr %d " 1043 "failed\n", mmc_hostname(card->host), 1044 1 << bus_width, ddr); 1045 goto free_card; 1046 } else if (ddr) { 1047 /* 1048 * eMMC cards can support 3.3V to 1.2V i/o (vccq) 1049 * signaling. 1050 * 1051 * EXT_CSD_CARD_TYPE_DDR_1_8V means 3.3V or 1.8V vccq. 1052 * 1053 * 1.8V vccq at 3.3V core voltage (vcc) is not required 1054 * in the JEDEC spec for DDR. 1055 * 1056 * Do not force change in vccq since we are obviously 1057 * working and no change to vccq is needed. 1058 * 1059 * WARNING: eMMC rules are NOT the same as SD DDR 1060 */ 1061 if (ddr == MMC_1_2V_DDR_MODE) { 1062 err = mmc_set_signal_voltage(host, 1063 MMC_SIGNAL_VOLTAGE_120, 0); 1064 if (err) 1065 goto err; 1066 } 1067 mmc_card_set_ddr_mode(card); 1068 mmc_set_timing(card->host, MMC_TIMING_UHS_DDR50); 1069 mmc_set_bus_width(card->host, bus_width); 1070 } 1071 } 1072 1073 /* 1074 * If cache size is higher than 0, this indicates 1075 * the existence of cache and it can be turned on. 1076 */ 1077 if ((host->caps2 & MMC_CAP2_CACHE_CTRL) && 1078 card->ext_csd.cache_size > 0) { 1079 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL, 1080 EXT_CSD_CACHE_CTRL, 1, 1081 card->ext_csd.generic_cmd6_time); 1082 if (err && err != -EBADMSG) 1083 goto free_card; 1084 1085 /* 1086 * Only if no error, cache is turned on successfully. 1087 */ 1088 if (err) { 1089 pr_warning("%s: Cache is supported, " 1090 "but failed to turn on (%d)\n", 1091 mmc_hostname(card->host), err); 1092 card->ext_csd.cache_ctrl = 0; 1093 err = 0; 1094 } else { 1095 card->ext_csd.cache_ctrl = 1; 1096 } 1097 } 1098 1099 if (!oldcard) 1100 host->card = card; 1101 1102 mmc_free_ext_csd(ext_csd); 1103 return 0; 1104 1105 free_card: 1106 if (!oldcard) 1107 mmc_remove_card(card); 1108 err: 1109 mmc_free_ext_csd(ext_csd); 1110 1111 return err; 1112 } 1113 1114 /* 1115 * Host is being removed. Free up the current card. 1116 */ 1117 static void mmc_remove(struct mmc_host *host) 1118 { 1119 BUG_ON(!host); 1120 BUG_ON(!host->card); 1121 1122 mmc_remove_card(host->card); 1123 host->card = NULL; 1124 } 1125 1126 /* 1127 * Card detection - card is alive. 1128 */ 1129 static int mmc_alive(struct mmc_host *host) 1130 { 1131 return mmc_send_status(host->card, NULL); 1132 } 1133 1134 /* 1135 * Card detection callback from host. 1136 */ 1137 static void mmc_detect(struct mmc_host *host) 1138 { 1139 int err; 1140 1141 BUG_ON(!host); 1142 BUG_ON(!host->card); 1143 1144 mmc_claim_host(host); 1145 1146 /* 1147 * Just check if our card has been removed. 1148 */ 1149 err = _mmc_detect_card_removed(host); 1150 1151 mmc_release_host(host); 1152 1153 if (err) { 1154 mmc_remove(host); 1155 1156 mmc_claim_host(host); 1157 mmc_detach_bus(host); 1158 mmc_power_off(host); 1159 mmc_release_host(host); 1160 } 1161 } 1162 1163 /* 1164 * Suspend callback from host. 1165 */ 1166 static int mmc_suspend(struct mmc_host *host) 1167 { 1168 int err = 0; 1169 1170 BUG_ON(!host); 1171 BUG_ON(!host->card); 1172 1173 mmc_claim_host(host); 1174 if (mmc_card_can_sleep(host)) 1175 err = mmc_card_sleep(host); 1176 else if (!mmc_host_is_spi(host)) 1177 mmc_deselect_cards(host); 1178 host->card->state &= ~MMC_STATE_HIGHSPEED; 1179 mmc_release_host(host); 1180 1181 return err; 1182 } 1183 1184 /* 1185 * Resume callback from host. 1186 * 1187 * This function tries to determine if the same card is still present 1188 * and, if so, restore all state to it. 1189 */ 1190 static int mmc_resume(struct mmc_host *host) 1191 { 1192 int err; 1193 1194 BUG_ON(!host); 1195 BUG_ON(!host->card); 1196 1197 mmc_claim_host(host); 1198 err = mmc_init_card(host, host->ocr, host->card); 1199 mmc_release_host(host); 1200 1201 return err; 1202 } 1203 1204 static int mmc_power_restore(struct mmc_host *host) 1205 { 1206 int ret; 1207 1208 host->card->state &= ~MMC_STATE_HIGHSPEED; 1209 mmc_claim_host(host); 1210 ret = mmc_init_card(host, host->ocr, host->card); 1211 mmc_release_host(host); 1212 1213 return ret; 1214 } 1215 1216 static int mmc_sleep(struct mmc_host *host) 1217 { 1218 struct mmc_card *card = host->card; 1219 int err = -ENOSYS; 1220 1221 if (card && card->ext_csd.rev >= 3) { 1222 err = mmc_card_sleepawake(host, 1); 1223 if (err < 0) 1224 pr_debug("%s: Error %d while putting card into sleep", 1225 mmc_hostname(host), err); 1226 } 1227 1228 return err; 1229 } 1230 1231 static int mmc_awake(struct mmc_host *host) 1232 { 1233 struct mmc_card *card = host->card; 1234 int err = -ENOSYS; 1235 1236 if (card && card->ext_csd.rev >= 3) { 1237 err = mmc_card_sleepawake(host, 0); 1238 if (err < 0) 1239 pr_debug("%s: Error %d while awaking sleeping card", 1240 mmc_hostname(host), err); 1241 } 1242 1243 return err; 1244 } 1245 1246 static const struct mmc_bus_ops mmc_ops = { 1247 .awake = mmc_awake, 1248 .sleep = mmc_sleep, 1249 .remove = mmc_remove, 1250 .detect = mmc_detect, 1251 .suspend = NULL, 1252 .resume = NULL, 1253 .power_restore = mmc_power_restore, 1254 .alive = mmc_alive, 1255 }; 1256 1257 static const struct mmc_bus_ops mmc_ops_unsafe = { 1258 .awake = mmc_awake, 1259 .sleep = mmc_sleep, 1260 .remove = mmc_remove, 1261 .detect = mmc_detect, 1262 .suspend = mmc_suspend, 1263 .resume = mmc_resume, 1264 .power_restore = mmc_power_restore, 1265 .alive = mmc_alive, 1266 }; 1267 1268 static void mmc_attach_bus_ops(struct mmc_host *host) 1269 { 1270 const struct mmc_bus_ops *bus_ops; 1271 1272 if (!mmc_card_is_removable(host)) 1273 bus_ops = &mmc_ops_unsafe; 1274 else 1275 bus_ops = &mmc_ops; 1276 mmc_attach_bus(host, bus_ops); 1277 } 1278 1279 /* 1280 * Starting point for MMC card init. 1281 */ 1282 int mmc_attach_mmc(struct mmc_host *host) 1283 { 1284 int err; 1285 u32 ocr; 1286 1287 BUG_ON(!host); 1288 WARN_ON(!host->claimed); 1289 1290 /* Set correct bus mode for MMC before attempting attach */ 1291 if (!mmc_host_is_spi(host)) 1292 mmc_set_bus_mode(host, MMC_BUSMODE_OPENDRAIN); 1293 1294 err = mmc_send_op_cond(host, 0, &ocr); 1295 if (err) 1296 return err; 1297 1298 mmc_attach_bus_ops(host); 1299 if (host->ocr_avail_mmc) 1300 host->ocr_avail = host->ocr_avail_mmc; 1301 1302 /* 1303 * We need to get OCR a different way for SPI. 1304 */ 1305 if (mmc_host_is_spi(host)) { 1306 err = mmc_spi_read_ocr(host, 1, &ocr); 1307 if (err) 1308 goto err; 1309 } 1310 1311 /* 1312 * Sanity check the voltages that the card claims to 1313 * support. 1314 */ 1315 if (ocr & 0x7F) { 1316 pr_warning("%s: card claims to support voltages " 1317 "below the defined range. These will be ignored.\n", 1318 mmc_hostname(host)); 1319 ocr &= ~0x7F; 1320 } 1321 1322 host->ocr = mmc_select_voltage(host, ocr); 1323 1324 /* 1325 * Can we support the voltage of the card? 1326 */ 1327 if (!host->ocr) { 1328 err = -EINVAL; 1329 goto err; 1330 } 1331 1332 /* 1333 * Detect and init the card. 1334 */ 1335 err = mmc_init_card(host, host->ocr, NULL); 1336 if (err) 1337 goto err; 1338 1339 mmc_release_host(host); 1340 err = mmc_add_card(host->card); 1341 mmc_claim_host(host); 1342 if (err) 1343 goto remove_card; 1344 1345 return 0; 1346 1347 remove_card: 1348 mmc_release_host(host); 1349 mmc_remove_card(host->card); 1350 mmc_claim_host(host); 1351 host->card = NULL; 1352 err: 1353 mmc_detach_bus(host); 1354 1355 pr_err("%s: error %d whilst initialising MMC card\n", 1356 mmc_hostname(host), err); 1357 1358 return err; 1359 } 1360