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 } 353 } 354 } 355 356 card->ext_csd.raw_hc_erase_gap_size = 357 ext_csd[EXT_CSD_PARTITION_ATTRIBUTE]; 358 card->ext_csd.raw_sec_trim_mult = 359 ext_csd[EXT_CSD_SEC_TRIM_MULT]; 360 card->ext_csd.raw_sec_erase_mult = 361 ext_csd[EXT_CSD_SEC_ERASE_MULT]; 362 card->ext_csd.raw_sec_feature_support = 363 ext_csd[EXT_CSD_SEC_FEATURE_SUPPORT]; 364 card->ext_csd.raw_trim_mult = 365 ext_csd[EXT_CSD_TRIM_MULT]; 366 if (card->ext_csd.rev >= 4) { 367 /* 368 * Enhanced area feature support -- check whether the eMMC 369 * card has the Enhanced area enabled. If so, export enhanced 370 * area offset and size to user by adding sysfs interface. 371 */ 372 card->ext_csd.raw_partition_support = ext_csd[EXT_CSD_PARTITION_SUPPORT]; 373 if ((ext_csd[EXT_CSD_PARTITION_SUPPORT] & 0x2) && 374 (ext_csd[EXT_CSD_PARTITION_ATTRIBUTE] & 0x1)) { 375 hc_erase_grp_sz = 376 ext_csd[EXT_CSD_HC_ERASE_GRP_SIZE]; 377 hc_wp_grp_sz = 378 ext_csd[EXT_CSD_HC_WP_GRP_SIZE]; 379 380 card->ext_csd.enhanced_area_en = 1; 381 /* 382 * calculate the enhanced data area offset, in bytes 383 */ 384 card->ext_csd.enhanced_area_offset = 385 (ext_csd[139] << 24) + (ext_csd[138] << 16) + 386 (ext_csd[137] << 8) + ext_csd[136]; 387 if (mmc_card_blockaddr(card)) 388 card->ext_csd.enhanced_area_offset <<= 9; 389 /* 390 * calculate the enhanced data area size, in kilobytes 391 */ 392 card->ext_csd.enhanced_area_size = 393 (ext_csd[142] << 16) + (ext_csd[141] << 8) + 394 ext_csd[140]; 395 card->ext_csd.enhanced_area_size *= 396 (size_t)(hc_erase_grp_sz * hc_wp_grp_sz); 397 card->ext_csd.enhanced_area_size <<= 9; 398 } else { 399 /* 400 * If the enhanced area is not enabled, disable these 401 * device attributes. 402 */ 403 card->ext_csd.enhanced_area_offset = -EINVAL; 404 card->ext_csd.enhanced_area_size = -EINVAL; 405 } 406 407 /* 408 * General purpose partition feature support -- 409 * If ext_csd has the size of general purpose partitions, 410 * set size, part_cfg, partition name in mmc_part. 411 */ 412 if (ext_csd[EXT_CSD_PARTITION_SUPPORT] & 413 EXT_CSD_PART_SUPPORT_PART_EN) { 414 if (card->ext_csd.enhanced_area_en != 1) { 415 hc_erase_grp_sz = 416 ext_csd[EXT_CSD_HC_ERASE_GRP_SIZE]; 417 hc_wp_grp_sz = 418 ext_csd[EXT_CSD_HC_WP_GRP_SIZE]; 419 420 card->ext_csd.enhanced_area_en = 1; 421 } 422 423 for (idx = 0; idx < MMC_NUM_GP_PARTITION; idx++) { 424 if (!ext_csd[EXT_CSD_GP_SIZE_MULT + idx * 3] && 425 !ext_csd[EXT_CSD_GP_SIZE_MULT + idx * 3 + 1] && 426 !ext_csd[EXT_CSD_GP_SIZE_MULT + idx * 3 + 2]) 427 continue; 428 part_size = 429 (ext_csd[EXT_CSD_GP_SIZE_MULT + idx * 3 + 2] 430 << 16) + 431 (ext_csd[EXT_CSD_GP_SIZE_MULT + idx * 3 + 1] 432 << 8) + 433 ext_csd[EXT_CSD_GP_SIZE_MULT + idx * 3]; 434 part_size *= (size_t)(hc_erase_grp_sz * 435 hc_wp_grp_sz); 436 mmc_part_add(card, part_size << 19, 437 EXT_CSD_PART_CONFIG_ACC_GP0 + idx, 438 "gp%d", idx, false); 439 } 440 } 441 card->ext_csd.sec_trim_mult = 442 ext_csd[EXT_CSD_SEC_TRIM_MULT]; 443 card->ext_csd.sec_erase_mult = 444 ext_csd[EXT_CSD_SEC_ERASE_MULT]; 445 card->ext_csd.sec_feature_support = 446 ext_csd[EXT_CSD_SEC_FEATURE_SUPPORT]; 447 card->ext_csd.trim_timeout = 300 * 448 ext_csd[EXT_CSD_TRIM_MULT]; 449 } 450 451 if (card->ext_csd.rev >= 5) { 452 /* check whether the eMMC card supports HPI */ 453 if (ext_csd[EXT_CSD_HPI_FEATURES] & 0x1) { 454 card->ext_csd.hpi = 1; 455 if (ext_csd[EXT_CSD_HPI_FEATURES] & 0x2) 456 card->ext_csd.hpi_cmd = MMC_STOP_TRANSMISSION; 457 else 458 card->ext_csd.hpi_cmd = MMC_SEND_STATUS; 459 /* 460 * Indicate the maximum timeout to close 461 * a command interrupted by HPI 462 */ 463 card->ext_csd.out_of_int_time = 464 ext_csd[EXT_CSD_OUT_OF_INTERRUPT_TIME] * 10; 465 } 466 467 card->ext_csd.rel_param = ext_csd[EXT_CSD_WR_REL_PARAM]; 468 card->ext_csd.rst_n_function = ext_csd[EXT_CSD_RST_N_FUNCTION]; 469 } 470 471 card->ext_csd.raw_erased_mem_count = ext_csd[EXT_CSD_ERASED_MEM_CONT]; 472 if (ext_csd[EXT_CSD_ERASED_MEM_CONT]) 473 card->erased_byte = 0xFF; 474 else 475 card->erased_byte = 0x0; 476 477 /* eMMC v4.5 or later */ 478 if (card->ext_csd.rev >= 6) { 479 card->ext_csd.feature_support |= MMC_DISCARD_FEATURE; 480 481 card->ext_csd.generic_cmd6_time = 10 * 482 ext_csd[EXT_CSD_GENERIC_CMD6_TIME]; 483 card->ext_csd.power_off_longtime = 10 * 484 ext_csd[EXT_CSD_POWER_OFF_LONG_TIME]; 485 486 card->ext_csd.cache_size = 487 ext_csd[EXT_CSD_CACHE_SIZE + 0] << 0 | 488 ext_csd[EXT_CSD_CACHE_SIZE + 1] << 8 | 489 ext_csd[EXT_CSD_CACHE_SIZE + 2] << 16 | 490 ext_csd[EXT_CSD_CACHE_SIZE + 3] << 24; 491 } 492 493 out: 494 return err; 495 } 496 497 static inline void mmc_free_ext_csd(u8 *ext_csd) 498 { 499 kfree(ext_csd); 500 } 501 502 503 static int mmc_compare_ext_csds(struct mmc_card *card, unsigned bus_width) 504 { 505 u8 *bw_ext_csd; 506 int err; 507 508 if (bus_width == MMC_BUS_WIDTH_1) 509 return 0; 510 511 err = mmc_get_ext_csd(card, &bw_ext_csd); 512 513 if (err || bw_ext_csd == NULL) { 514 if (bus_width != MMC_BUS_WIDTH_1) 515 err = -EINVAL; 516 goto out; 517 } 518 519 if (bus_width == MMC_BUS_WIDTH_1) 520 goto out; 521 522 /* only compare read only fields */ 523 err = (!(card->ext_csd.raw_partition_support == 524 bw_ext_csd[EXT_CSD_PARTITION_SUPPORT]) && 525 (card->ext_csd.raw_erased_mem_count == 526 bw_ext_csd[EXT_CSD_ERASED_MEM_CONT]) && 527 (card->ext_csd.rev == 528 bw_ext_csd[EXT_CSD_REV]) && 529 (card->ext_csd.raw_ext_csd_structure == 530 bw_ext_csd[EXT_CSD_STRUCTURE]) && 531 (card->ext_csd.raw_card_type == 532 bw_ext_csd[EXT_CSD_CARD_TYPE]) && 533 (card->ext_csd.raw_s_a_timeout == 534 bw_ext_csd[EXT_CSD_S_A_TIMEOUT]) && 535 (card->ext_csd.raw_hc_erase_gap_size == 536 bw_ext_csd[EXT_CSD_HC_WP_GRP_SIZE]) && 537 (card->ext_csd.raw_erase_timeout_mult == 538 bw_ext_csd[EXT_CSD_ERASE_TIMEOUT_MULT]) && 539 (card->ext_csd.raw_hc_erase_grp_size == 540 bw_ext_csd[EXT_CSD_HC_ERASE_GRP_SIZE]) && 541 (card->ext_csd.raw_sec_trim_mult == 542 bw_ext_csd[EXT_CSD_SEC_TRIM_MULT]) && 543 (card->ext_csd.raw_sec_erase_mult == 544 bw_ext_csd[EXT_CSD_SEC_ERASE_MULT]) && 545 (card->ext_csd.raw_sec_feature_support == 546 bw_ext_csd[EXT_CSD_SEC_FEATURE_SUPPORT]) && 547 (card->ext_csd.raw_trim_mult == 548 bw_ext_csd[EXT_CSD_TRIM_MULT]) && 549 (card->ext_csd.raw_sectors[0] == 550 bw_ext_csd[EXT_CSD_SEC_CNT + 0]) && 551 (card->ext_csd.raw_sectors[1] == 552 bw_ext_csd[EXT_CSD_SEC_CNT + 1]) && 553 (card->ext_csd.raw_sectors[2] == 554 bw_ext_csd[EXT_CSD_SEC_CNT + 2]) && 555 (card->ext_csd.raw_sectors[3] == 556 bw_ext_csd[EXT_CSD_SEC_CNT + 3])); 557 if (err) 558 err = -EINVAL; 559 560 out: 561 mmc_free_ext_csd(bw_ext_csd); 562 return err; 563 } 564 565 MMC_DEV_ATTR(cid, "%08x%08x%08x%08x\n", card->raw_cid[0], card->raw_cid[1], 566 card->raw_cid[2], card->raw_cid[3]); 567 MMC_DEV_ATTR(csd, "%08x%08x%08x%08x\n", card->raw_csd[0], card->raw_csd[1], 568 card->raw_csd[2], card->raw_csd[3]); 569 MMC_DEV_ATTR(date, "%02d/%04d\n", card->cid.month, card->cid.year); 570 MMC_DEV_ATTR(erase_size, "%u\n", card->erase_size << 9); 571 MMC_DEV_ATTR(preferred_erase_size, "%u\n", card->pref_erase << 9); 572 MMC_DEV_ATTR(fwrev, "0x%x\n", card->cid.fwrev); 573 MMC_DEV_ATTR(hwrev, "0x%x\n", card->cid.hwrev); 574 MMC_DEV_ATTR(manfid, "0x%06x\n", card->cid.manfid); 575 MMC_DEV_ATTR(name, "%s\n", card->cid.prod_name); 576 MMC_DEV_ATTR(oemid, "0x%04x\n", card->cid.oemid); 577 MMC_DEV_ATTR(serial, "0x%08x\n", card->cid.serial); 578 MMC_DEV_ATTR(enhanced_area_offset, "%llu\n", 579 card->ext_csd.enhanced_area_offset); 580 MMC_DEV_ATTR(enhanced_area_size, "%u\n", card->ext_csd.enhanced_area_size); 581 582 static struct attribute *mmc_std_attrs[] = { 583 &dev_attr_cid.attr, 584 &dev_attr_csd.attr, 585 &dev_attr_date.attr, 586 &dev_attr_erase_size.attr, 587 &dev_attr_preferred_erase_size.attr, 588 &dev_attr_fwrev.attr, 589 &dev_attr_hwrev.attr, 590 &dev_attr_manfid.attr, 591 &dev_attr_name.attr, 592 &dev_attr_oemid.attr, 593 &dev_attr_serial.attr, 594 &dev_attr_enhanced_area_offset.attr, 595 &dev_attr_enhanced_area_size.attr, 596 NULL, 597 }; 598 599 static struct attribute_group mmc_std_attr_group = { 600 .attrs = mmc_std_attrs, 601 }; 602 603 static const struct attribute_group *mmc_attr_groups[] = { 604 &mmc_std_attr_group, 605 NULL, 606 }; 607 608 static struct device_type mmc_type = { 609 .groups = mmc_attr_groups, 610 }; 611 612 /* 613 * Select the PowerClass for the current bus width 614 * If power class is defined for 4/8 bit bus in the 615 * extended CSD register, select it by executing the 616 * mmc_switch command. 617 */ 618 static int mmc_select_powerclass(struct mmc_card *card, 619 unsigned int bus_width, u8 *ext_csd) 620 { 621 int err = 0; 622 unsigned int pwrclass_val; 623 unsigned int index = 0; 624 struct mmc_host *host; 625 626 BUG_ON(!card); 627 628 host = card->host; 629 BUG_ON(!host); 630 631 if (ext_csd == NULL) 632 return 0; 633 634 /* Power class selection is supported for versions >= 4.0 */ 635 if (card->csd.mmca_vsn < CSD_SPEC_VER_4) 636 return 0; 637 638 /* Power class values are defined only for 4/8 bit bus */ 639 if (bus_width == EXT_CSD_BUS_WIDTH_1) 640 return 0; 641 642 switch (1 << host->ios.vdd) { 643 case MMC_VDD_165_195: 644 if (host->ios.clock <= 26000000) 645 index = EXT_CSD_PWR_CL_26_195; 646 else if (host->ios.clock <= 52000000) 647 index = (bus_width <= EXT_CSD_BUS_WIDTH_8) ? 648 EXT_CSD_PWR_CL_52_195 : 649 EXT_CSD_PWR_CL_DDR_52_195; 650 else if (host->ios.clock <= 200000000) 651 index = EXT_CSD_PWR_CL_200_195; 652 break; 653 case MMC_VDD_32_33: 654 case MMC_VDD_33_34: 655 case MMC_VDD_34_35: 656 case MMC_VDD_35_36: 657 if (host->ios.clock <= 26000000) 658 index = EXT_CSD_PWR_CL_26_360; 659 else if (host->ios.clock <= 52000000) 660 index = (bus_width <= EXT_CSD_BUS_WIDTH_8) ? 661 EXT_CSD_PWR_CL_52_360 : 662 EXT_CSD_PWR_CL_DDR_52_360; 663 else if (host->ios.clock <= 200000000) 664 index = EXT_CSD_PWR_CL_200_360; 665 break; 666 default: 667 pr_warning("%s: Voltage range not supported " 668 "for power class.\n", mmc_hostname(host)); 669 return -EINVAL; 670 } 671 672 pwrclass_val = ext_csd[index]; 673 674 if (bus_width & (EXT_CSD_BUS_WIDTH_8 | EXT_CSD_DDR_BUS_WIDTH_8)) 675 pwrclass_val = (pwrclass_val & EXT_CSD_PWR_CL_8BIT_MASK) >> 676 EXT_CSD_PWR_CL_8BIT_SHIFT; 677 else 678 pwrclass_val = (pwrclass_val & EXT_CSD_PWR_CL_4BIT_MASK) >> 679 EXT_CSD_PWR_CL_4BIT_SHIFT; 680 681 /* If the power class is different from the default value */ 682 if (pwrclass_val > 0) { 683 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL, 684 EXT_CSD_POWER_CLASS, 685 pwrclass_val, 686 card->ext_csd.generic_cmd6_time); 687 } 688 689 return err; 690 } 691 692 /* 693 * Handle the detection and initialisation of a card. 694 * 695 * In the case of a resume, "oldcard" will contain the card 696 * we're trying to reinitialise. 697 */ 698 static int mmc_init_card(struct mmc_host *host, u32 ocr, 699 struct mmc_card *oldcard) 700 { 701 struct mmc_card *card; 702 int err, ddr = 0; 703 u32 cid[4]; 704 unsigned int max_dtr; 705 u32 rocr; 706 u8 *ext_csd = NULL; 707 708 BUG_ON(!host); 709 WARN_ON(!host->claimed); 710 711 /* Set correct bus mode for MMC before attempting init */ 712 if (!mmc_host_is_spi(host)) 713 mmc_set_bus_mode(host, MMC_BUSMODE_OPENDRAIN); 714 715 /* 716 * Since we're changing the OCR value, we seem to 717 * need to tell some cards to go back to the idle 718 * state. We wait 1ms to give cards time to 719 * respond. 720 * mmc_go_idle is needed for eMMC that are asleep 721 */ 722 mmc_go_idle(host); 723 724 /* The extra bit indicates that we support high capacity */ 725 err = mmc_send_op_cond(host, ocr | (1 << 30), &rocr); 726 if (err) 727 goto err; 728 729 /* 730 * For SPI, enable CRC as appropriate. 731 */ 732 if (mmc_host_is_spi(host)) { 733 err = mmc_spi_set_crc(host, use_spi_crc); 734 if (err) 735 goto err; 736 } 737 738 /* 739 * Fetch CID from card. 740 */ 741 if (mmc_host_is_spi(host)) 742 err = mmc_send_cid(host, cid); 743 else 744 err = mmc_all_send_cid(host, cid); 745 if (err) 746 goto err; 747 748 if (oldcard) { 749 if (memcmp(cid, oldcard->raw_cid, sizeof(cid)) != 0) { 750 err = -ENOENT; 751 goto err; 752 } 753 754 card = oldcard; 755 } else { 756 /* 757 * Allocate card structure. 758 */ 759 card = mmc_alloc_card(host, &mmc_type); 760 if (IS_ERR(card)) { 761 err = PTR_ERR(card); 762 goto err; 763 } 764 765 card->type = MMC_TYPE_MMC; 766 card->rca = 1; 767 memcpy(card->raw_cid, cid, sizeof(card->raw_cid)); 768 } 769 770 /* 771 * For native busses: set card RCA and quit open drain mode. 772 */ 773 if (!mmc_host_is_spi(host)) { 774 err = mmc_set_relative_addr(card); 775 if (err) 776 goto free_card; 777 778 mmc_set_bus_mode(host, MMC_BUSMODE_PUSHPULL); 779 } 780 781 if (!oldcard) { 782 /* 783 * Fetch CSD from card. 784 */ 785 err = mmc_send_csd(card, card->raw_csd); 786 if (err) 787 goto free_card; 788 789 err = mmc_decode_csd(card); 790 if (err) 791 goto free_card; 792 err = mmc_decode_cid(card); 793 if (err) 794 goto free_card; 795 } 796 797 /* 798 * Select card, as all following commands rely on that. 799 */ 800 if (!mmc_host_is_spi(host)) { 801 err = mmc_select_card(card); 802 if (err) 803 goto free_card; 804 } 805 806 if (!oldcard) { 807 /* 808 * Fetch and process extended CSD. 809 */ 810 811 err = mmc_get_ext_csd(card, &ext_csd); 812 if (err) 813 goto free_card; 814 err = mmc_read_ext_csd(card, ext_csd); 815 if (err) 816 goto free_card; 817 818 /* If doing byte addressing, check if required to do sector 819 * addressing. Handle the case of <2GB cards needing sector 820 * addressing. See section 8.1 JEDEC Standard JED84-A441; 821 * ocr register has bit 30 set for sector addressing. 822 */ 823 if (!(mmc_card_blockaddr(card)) && (rocr & (1<<30))) 824 mmc_card_set_blockaddr(card); 825 826 /* Erase size depends on CSD and Extended CSD */ 827 mmc_set_erase_size(card); 828 } 829 830 /* 831 * If enhanced_area_en is TRUE, host needs to enable ERASE_GRP_DEF 832 * bit. This bit will be lost every time after a reset or power off. 833 */ 834 if (card->ext_csd.enhanced_area_en) { 835 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL, 836 EXT_CSD_ERASE_GROUP_DEF, 1, 837 card->ext_csd.generic_cmd6_time); 838 839 if (err && err != -EBADMSG) 840 goto free_card; 841 842 if (err) { 843 err = 0; 844 /* 845 * Just disable enhanced area off & sz 846 * will try to enable ERASE_GROUP_DEF 847 * during next time reinit 848 */ 849 card->ext_csd.enhanced_area_offset = -EINVAL; 850 card->ext_csd.enhanced_area_size = -EINVAL; 851 } else { 852 card->ext_csd.erase_group_def = 1; 853 /* 854 * enable ERASE_GRP_DEF successfully. 855 * This will affect the erase size, so 856 * here need to reset erase size 857 */ 858 mmc_set_erase_size(card); 859 } 860 } 861 862 /* 863 * Ensure eMMC user default partition is enabled 864 */ 865 if (card->ext_csd.part_config & EXT_CSD_PART_CONFIG_ACC_MASK) { 866 card->ext_csd.part_config &= ~EXT_CSD_PART_CONFIG_ACC_MASK; 867 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL, EXT_CSD_PART_CONFIG, 868 card->ext_csd.part_config, 869 card->ext_csd.part_time); 870 if (err && err != -EBADMSG) 871 goto free_card; 872 } 873 874 /* 875 * If the host supports the power_off_notify capability then 876 * set the notification byte in the ext_csd register of device 877 */ 878 if ((host->caps2 & MMC_CAP2_POWEROFF_NOTIFY) && 879 (card->poweroff_notify_state == MMC_NO_POWER_NOTIFICATION)) { 880 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL, 881 EXT_CSD_POWER_OFF_NOTIFICATION, 882 EXT_CSD_POWER_ON, 883 card->ext_csd.generic_cmd6_time); 884 if (err && err != -EBADMSG) 885 goto free_card; 886 887 /* 888 * The err can be -EBADMSG or 0, 889 * so check for success and update the flag 890 */ 891 if (!err) 892 card->poweroff_notify_state = MMC_POWERED_ON; 893 } 894 895 /* 896 * Activate high speed (if supported) 897 */ 898 if ((card->ext_csd.hs_max_dtr != 0) && 899 (host->caps & MMC_CAP_MMC_HIGHSPEED)) { 900 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL, 901 EXT_CSD_HS_TIMING, 1, 902 card->ext_csd.generic_cmd6_time); 903 if (err && err != -EBADMSG) 904 goto free_card; 905 906 if (err) { 907 pr_warning("%s: switch to highspeed failed\n", 908 mmc_hostname(card->host)); 909 err = 0; 910 } else { 911 mmc_card_set_highspeed(card); 912 mmc_set_timing(card->host, MMC_TIMING_MMC_HS); 913 } 914 } 915 916 /* 917 * Enable HPI feature (if supported) 918 */ 919 if (card->ext_csd.hpi) { 920 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL, 921 EXT_CSD_HPI_MGMT, 1, 0); 922 if (err && err != -EBADMSG) 923 goto free_card; 924 if (err) { 925 pr_warning("%s: Enabling HPI failed\n", 926 mmc_hostname(card->host)); 927 err = 0; 928 } else 929 card->ext_csd.hpi_en = 1; 930 } 931 932 /* 933 * Compute bus speed. 934 */ 935 max_dtr = (unsigned int)-1; 936 937 if (mmc_card_highspeed(card)) { 938 if (max_dtr > card->ext_csd.hs_max_dtr) 939 max_dtr = card->ext_csd.hs_max_dtr; 940 } else if (max_dtr > card->csd.max_dtr) { 941 max_dtr = card->csd.max_dtr; 942 } 943 944 mmc_set_clock(host, max_dtr); 945 946 /* 947 * Indicate DDR mode (if supported). 948 */ 949 if (mmc_card_highspeed(card)) { 950 if ((card->ext_csd.card_type & EXT_CSD_CARD_TYPE_DDR_1_8V) 951 && ((host->caps & (MMC_CAP_1_8V_DDR | 952 MMC_CAP_UHS_DDR50)) 953 == (MMC_CAP_1_8V_DDR | MMC_CAP_UHS_DDR50))) 954 ddr = MMC_1_8V_DDR_MODE; 955 else if ((card->ext_csd.card_type & EXT_CSD_CARD_TYPE_DDR_1_2V) 956 && ((host->caps & (MMC_CAP_1_2V_DDR | 957 MMC_CAP_UHS_DDR50)) 958 == (MMC_CAP_1_2V_DDR | MMC_CAP_UHS_DDR50))) 959 ddr = MMC_1_2V_DDR_MODE; 960 } 961 962 /* 963 * Activate wide bus and DDR (if supported). 964 */ 965 if ((card->csd.mmca_vsn >= CSD_SPEC_VER_4) && 966 (host->caps & (MMC_CAP_4_BIT_DATA | MMC_CAP_8_BIT_DATA))) { 967 static unsigned ext_csd_bits[][2] = { 968 { EXT_CSD_BUS_WIDTH_8, EXT_CSD_DDR_BUS_WIDTH_8 }, 969 { EXT_CSD_BUS_WIDTH_4, EXT_CSD_DDR_BUS_WIDTH_4 }, 970 { EXT_CSD_BUS_WIDTH_1, EXT_CSD_BUS_WIDTH_1 }, 971 }; 972 static unsigned bus_widths[] = { 973 MMC_BUS_WIDTH_8, 974 MMC_BUS_WIDTH_4, 975 MMC_BUS_WIDTH_1 976 }; 977 unsigned idx, bus_width = 0; 978 979 if (host->caps & MMC_CAP_8_BIT_DATA) 980 idx = 0; 981 else 982 idx = 1; 983 for (; idx < ARRAY_SIZE(bus_widths); idx++) { 984 bus_width = bus_widths[idx]; 985 if (bus_width == MMC_BUS_WIDTH_1) 986 ddr = 0; /* no DDR for 1-bit width */ 987 err = mmc_select_powerclass(card, ext_csd_bits[idx][0], 988 ext_csd); 989 if (err) 990 pr_err("%s: power class selection to " 991 "bus width %d failed\n", 992 mmc_hostname(card->host), 993 1 << bus_width); 994 995 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL, 996 EXT_CSD_BUS_WIDTH, 997 ext_csd_bits[idx][0], 998 card->ext_csd.generic_cmd6_time); 999 if (!err) { 1000 mmc_set_bus_width(card->host, bus_width); 1001 1002 /* 1003 * If controller can't handle bus width test, 1004 * compare ext_csd previously read in 1 bit mode 1005 * against ext_csd at new bus width 1006 */ 1007 if (!(host->caps & MMC_CAP_BUS_WIDTH_TEST)) 1008 err = mmc_compare_ext_csds(card, 1009 bus_width); 1010 else 1011 err = mmc_bus_test(card, bus_width); 1012 if (!err) 1013 break; 1014 } 1015 } 1016 1017 if (!err && ddr) { 1018 err = mmc_select_powerclass(card, ext_csd_bits[idx][1], 1019 ext_csd); 1020 if (err) 1021 pr_err("%s: power class selection to " 1022 "bus width %d ddr %d failed\n", 1023 mmc_hostname(card->host), 1024 1 << bus_width, ddr); 1025 1026 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL, 1027 EXT_CSD_BUS_WIDTH, 1028 ext_csd_bits[idx][1], 1029 card->ext_csd.generic_cmd6_time); 1030 } 1031 if (err) { 1032 pr_warning("%s: switch to bus width %d ddr %d " 1033 "failed\n", mmc_hostname(card->host), 1034 1 << bus_width, ddr); 1035 goto free_card; 1036 } else if (ddr) { 1037 /* 1038 * eMMC cards can support 3.3V to 1.2V i/o (vccq) 1039 * signaling. 1040 * 1041 * EXT_CSD_CARD_TYPE_DDR_1_8V means 3.3V or 1.8V vccq. 1042 * 1043 * 1.8V vccq at 3.3V core voltage (vcc) is not required 1044 * in the JEDEC spec for DDR. 1045 * 1046 * Do not force change in vccq since we are obviously 1047 * working and no change to vccq is needed. 1048 * 1049 * WARNING: eMMC rules are NOT the same as SD DDR 1050 */ 1051 if (ddr == EXT_CSD_CARD_TYPE_DDR_1_2V) { 1052 err = mmc_set_signal_voltage(host, 1053 MMC_SIGNAL_VOLTAGE_120, 0); 1054 if (err) 1055 goto err; 1056 } 1057 mmc_card_set_ddr_mode(card); 1058 mmc_set_timing(card->host, MMC_TIMING_UHS_DDR50); 1059 mmc_set_bus_width(card->host, bus_width); 1060 } 1061 } 1062 1063 /* 1064 * If cache size is higher than 0, this indicates 1065 * the existence of cache and it can be turned on. 1066 */ 1067 if ((host->caps2 & MMC_CAP2_CACHE_CTRL) && 1068 card->ext_csd.cache_size > 0) { 1069 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL, 1070 EXT_CSD_CACHE_CTRL, 1, 0); 1071 if (err && err != -EBADMSG) 1072 goto free_card; 1073 1074 /* 1075 * Only if no error, cache is turned on successfully. 1076 */ 1077 card->ext_csd.cache_ctrl = err ? 0 : 1; 1078 } 1079 1080 if (!oldcard) 1081 host->card = card; 1082 1083 mmc_free_ext_csd(ext_csd); 1084 return 0; 1085 1086 free_card: 1087 if (!oldcard) 1088 mmc_remove_card(card); 1089 err: 1090 mmc_free_ext_csd(ext_csd); 1091 1092 return err; 1093 } 1094 1095 /* 1096 * Host is being removed. Free up the current card. 1097 */ 1098 static void mmc_remove(struct mmc_host *host) 1099 { 1100 BUG_ON(!host); 1101 BUG_ON(!host->card); 1102 1103 mmc_remove_card(host->card); 1104 host->card = NULL; 1105 } 1106 1107 /* 1108 * Card detection callback from host. 1109 */ 1110 static void mmc_detect(struct mmc_host *host) 1111 { 1112 int err; 1113 1114 BUG_ON(!host); 1115 BUG_ON(!host->card); 1116 1117 mmc_claim_host(host); 1118 1119 /* 1120 * Just check if our card has been removed. 1121 */ 1122 err = mmc_send_status(host->card, NULL); 1123 1124 mmc_release_host(host); 1125 1126 if (err) { 1127 mmc_remove(host); 1128 1129 mmc_claim_host(host); 1130 mmc_detach_bus(host); 1131 mmc_power_off(host); 1132 mmc_release_host(host); 1133 } 1134 } 1135 1136 /* 1137 * Suspend callback from host. 1138 */ 1139 static int mmc_suspend(struct mmc_host *host) 1140 { 1141 int err = 0; 1142 1143 BUG_ON(!host); 1144 BUG_ON(!host->card); 1145 1146 mmc_claim_host(host); 1147 if (mmc_card_can_sleep(host)) 1148 err = mmc_card_sleep(host); 1149 else if (!mmc_host_is_spi(host)) 1150 mmc_deselect_cards(host); 1151 host->card->state &= ~MMC_STATE_HIGHSPEED; 1152 mmc_release_host(host); 1153 1154 return err; 1155 } 1156 1157 /* 1158 * Resume callback from host. 1159 * 1160 * This function tries to determine if the same card is still present 1161 * and, if so, restore all state to it. 1162 */ 1163 static int mmc_resume(struct mmc_host *host) 1164 { 1165 int err; 1166 1167 BUG_ON(!host); 1168 BUG_ON(!host->card); 1169 1170 mmc_claim_host(host); 1171 err = mmc_init_card(host, host->ocr, host->card); 1172 mmc_release_host(host); 1173 1174 return err; 1175 } 1176 1177 static int mmc_power_restore(struct mmc_host *host) 1178 { 1179 int ret; 1180 1181 host->card->state &= ~MMC_STATE_HIGHSPEED; 1182 mmc_claim_host(host); 1183 ret = mmc_init_card(host, host->ocr, host->card); 1184 mmc_release_host(host); 1185 1186 return ret; 1187 } 1188 1189 static int mmc_sleep(struct mmc_host *host) 1190 { 1191 struct mmc_card *card = host->card; 1192 int err = -ENOSYS; 1193 1194 if (card && card->ext_csd.rev >= 3) { 1195 err = mmc_card_sleepawake(host, 1); 1196 if (err < 0) 1197 pr_debug("%s: Error %d while putting card into sleep", 1198 mmc_hostname(host), err); 1199 } 1200 1201 return err; 1202 } 1203 1204 static int mmc_awake(struct mmc_host *host) 1205 { 1206 struct mmc_card *card = host->card; 1207 int err = -ENOSYS; 1208 1209 if (card && card->ext_csd.rev >= 3) { 1210 err = mmc_card_sleepawake(host, 0); 1211 if (err < 0) 1212 pr_debug("%s: Error %d while awaking sleeping card", 1213 mmc_hostname(host), err); 1214 } 1215 1216 return err; 1217 } 1218 1219 static const struct mmc_bus_ops mmc_ops = { 1220 .awake = mmc_awake, 1221 .sleep = mmc_sleep, 1222 .remove = mmc_remove, 1223 .detect = mmc_detect, 1224 .suspend = NULL, 1225 .resume = NULL, 1226 .power_restore = mmc_power_restore, 1227 }; 1228 1229 static const struct mmc_bus_ops mmc_ops_unsafe = { 1230 .awake = mmc_awake, 1231 .sleep = mmc_sleep, 1232 .remove = mmc_remove, 1233 .detect = mmc_detect, 1234 .suspend = mmc_suspend, 1235 .resume = mmc_resume, 1236 .power_restore = mmc_power_restore, 1237 }; 1238 1239 static void mmc_attach_bus_ops(struct mmc_host *host) 1240 { 1241 const struct mmc_bus_ops *bus_ops; 1242 1243 if (!mmc_card_is_removable(host)) 1244 bus_ops = &mmc_ops_unsafe; 1245 else 1246 bus_ops = &mmc_ops; 1247 mmc_attach_bus(host, bus_ops); 1248 } 1249 1250 /* 1251 * Starting point for MMC card init. 1252 */ 1253 int mmc_attach_mmc(struct mmc_host *host) 1254 { 1255 int err; 1256 u32 ocr; 1257 1258 BUG_ON(!host); 1259 WARN_ON(!host->claimed); 1260 1261 /* Set correct bus mode for MMC before attempting attach */ 1262 if (!mmc_host_is_spi(host)) 1263 mmc_set_bus_mode(host, MMC_BUSMODE_OPENDRAIN); 1264 1265 err = mmc_send_op_cond(host, 0, &ocr); 1266 if (err) 1267 return err; 1268 1269 mmc_attach_bus_ops(host); 1270 if (host->ocr_avail_mmc) 1271 host->ocr_avail = host->ocr_avail_mmc; 1272 1273 /* 1274 * We need to get OCR a different way for SPI. 1275 */ 1276 if (mmc_host_is_spi(host)) { 1277 err = mmc_spi_read_ocr(host, 1, &ocr); 1278 if (err) 1279 goto err; 1280 } 1281 1282 /* 1283 * Sanity check the voltages that the card claims to 1284 * support. 1285 */ 1286 if (ocr & 0x7F) { 1287 pr_warning("%s: card claims to support voltages " 1288 "below the defined range. These will be ignored.\n", 1289 mmc_hostname(host)); 1290 ocr &= ~0x7F; 1291 } 1292 1293 host->ocr = mmc_select_voltage(host, ocr); 1294 1295 /* 1296 * Can we support the voltage of the card? 1297 */ 1298 if (!host->ocr) { 1299 err = -EINVAL; 1300 goto err; 1301 } 1302 1303 /* 1304 * Detect and init the card. 1305 */ 1306 err = mmc_init_card(host, host->ocr, NULL); 1307 if (err) 1308 goto err; 1309 1310 mmc_release_host(host); 1311 err = mmc_add_card(host->card); 1312 mmc_claim_host(host); 1313 if (err) 1314 goto remove_card; 1315 1316 return 0; 1317 1318 remove_card: 1319 mmc_release_host(host); 1320 mmc_remove_card(host->card); 1321 mmc_claim_host(host); 1322 host->card = NULL; 1323 err: 1324 mmc_detach_bus(host); 1325 1326 pr_err("%s: error %d whilst initialising MMC card\n", 1327 mmc_hostname(host), err); 1328 1329 return err; 1330 } 1331