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 static void mmc_select_card_type(struct mmc_card *card) 239 { 240 struct mmc_host *host = card->host; 241 u8 card_type = card->ext_csd.raw_card_type & EXT_CSD_CARD_TYPE_MASK; 242 unsigned int caps = host->caps, caps2 = host->caps2; 243 unsigned int hs_max_dtr = 0; 244 245 if (card_type & EXT_CSD_CARD_TYPE_26) 246 hs_max_dtr = MMC_HIGH_26_MAX_DTR; 247 248 if (caps & MMC_CAP_MMC_HIGHSPEED && 249 card_type & EXT_CSD_CARD_TYPE_52) 250 hs_max_dtr = MMC_HIGH_52_MAX_DTR; 251 252 if ((caps & MMC_CAP_1_8V_DDR && 253 card_type & EXT_CSD_CARD_TYPE_DDR_1_8V) || 254 (caps & MMC_CAP_1_2V_DDR && 255 card_type & EXT_CSD_CARD_TYPE_DDR_1_2V)) 256 hs_max_dtr = MMC_HIGH_DDR_MAX_DTR; 257 258 if ((caps2 & MMC_CAP2_HS200_1_8V_SDR && 259 card_type & EXT_CSD_CARD_TYPE_SDR_1_8V) || 260 (caps2 & MMC_CAP2_HS200_1_2V_SDR && 261 card_type & EXT_CSD_CARD_TYPE_SDR_1_2V)) 262 hs_max_dtr = MMC_HS200_MAX_DTR; 263 264 card->ext_csd.hs_max_dtr = hs_max_dtr; 265 card->ext_csd.card_type = card_type; 266 } 267 268 /* 269 * Decode extended CSD. 270 */ 271 static int mmc_read_ext_csd(struct mmc_card *card, u8 *ext_csd) 272 { 273 int err = 0, idx; 274 unsigned int part_size; 275 u8 hc_erase_grp_sz = 0, hc_wp_grp_sz = 0; 276 277 BUG_ON(!card); 278 279 if (!ext_csd) 280 return 0; 281 282 /* Version is coded in the CSD_STRUCTURE byte in the EXT_CSD register */ 283 card->ext_csd.raw_ext_csd_structure = ext_csd[EXT_CSD_STRUCTURE]; 284 if (card->csd.structure == 3) { 285 if (card->ext_csd.raw_ext_csd_structure > 2) { 286 pr_err("%s: unrecognised EXT_CSD structure " 287 "version %d\n", mmc_hostname(card->host), 288 card->ext_csd.raw_ext_csd_structure); 289 err = -EINVAL; 290 goto out; 291 } 292 } 293 294 card->ext_csd.rev = ext_csd[EXT_CSD_REV]; 295 if (card->ext_csd.rev > 6) { 296 pr_err("%s: unrecognised EXT_CSD revision %d\n", 297 mmc_hostname(card->host), card->ext_csd.rev); 298 err = -EINVAL; 299 goto out; 300 } 301 302 card->ext_csd.raw_sectors[0] = ext_csd[EXT_CSD_SEC_CNT + 0]; 303 card->ext_csd.raw_sectors[1] = ext_csd[EXT_CSD_SEC_CNT + 1]; 304 card->ext_csd.raw_sectors[2] = ext_csd[EXT_CSD_SEC_CNT + 2]; 305 card->ext_csd.raw_sectors[3] = ext_csd[EXT_CSD_SEC_CNT + 3]; 306 if (card->ext_csd.rev >= 2) { 307 card->ext_csd.sectors = 308 ext_csd[EXT_CSD_SEC_CNT + 0] << 0 | 309 ext_csd[EXT_CSD_SEC_CNT + 1] << 8 | 310 ext_csd[EXT_CSD_SEC_CNT + 2] << 16 | 311 ext_csd[EXT_CSD_SEC_CNT + 3] << 24; 312 313 /* Cards with density > 2GiB are sector addressed */ 314 if (card->ext_csd.sectors > (2u * 1024 * 1024 * 1024) / 512) 315 mmc_card_set_blockaddr(card); 316 } 317 318 card->ext_csd.raw_card_type = ext_csd[EXT_CSD_CARD_TYPE]; 319 mmc_select_card_type(card); 320 321 card->ext_csd.raw_s_a_timeout = ext_csd[EXT_CSD_S_A_TIMEOUT]; 322 card->ext_csd.raw_erase_timeout_mult = 323 ext_csd[EXT_CSD_ERASE_TIMEOUT_MULT]; 324 card->ext_csd.raw_hc_erase_grp_size = 325 ext_csd[EXT_CSD_HC_ERASE_GRP_SIZE]; 326 if (card->ext_csd.rev >= 3) { 327 u8 sa_shift = ext_csd[EXT_CSD_S_A_TIMEOUT]; 328 card->ext_csd.part_config = ext_csd[EXT_CSD_PART_CONFIG]; 329 330 /* EXT_CSD value is in units of 10ms, but we store in ms */ 331 card->ext_csd.part_time = 10 * ext_csd[EXT_CSD_PART_SWITCH_TIME]; 332 333 /* Sleep / awake timeout in 100ns units */ 334 if (sa_shift > 0 && sa_shift <= 0x17) 335 card->ext_csd.sa_timeout = 336 1 << ext_csd[EXT_CSD_S_A_TIMEOUT]; 337 card->ext_csd.erase_group_def = 338 ext_csd[EXT_CSD_ERASE_GROUP_DEF]; 339 card->ext_csd.hc_erase_timeout = 300 * 340 ext_csd[EXT_CSD_ERASE_TIMEOUT_MULT]; 341 card->ext_csd.hc_erase_size = 342 ext_csd[EXT_CSD_HC_ERASE_GRP_SIZE] << 10; 343 344 card->ext_csd.rel_sectors = ext_csd[EXT_CSD_REL_WR_SEC_C]; 345 346 /* 347 * There are two boot regions of equal size, defined in 348 * multiples of 128K. 349 */ 350 if (ext_csd[EXT_CSD_BOOT_MULT] && mmc_boot_partition_access(card->host)) { 351 for (idx = 0; idx < MMC_NUM_BOOT_PARTITION; idx++) { 352 part_size = ext_csd[EXT_CSD_BOOT_MULT] << 17; 353 mmc_part_add(card, part_size, 354 EXT_CSD_PART_CONFIG_ACC_BOOT0 + idx, 355 "boot%d", idx, true, 356 MMC_BLK_DATA_AREA_BOOT); 357 } 358 } 359 } 360 361 card->ext_csd.raw_hc_erase_gap_size = 362 ext_csd[EXT_CSD_HC_WP_GRP_SIZE]; 363 card->ext_csd.raw_sec_trim_mult = 364 ext_csd[EXT_CSD_SEC_TRIM_MULT]; 365 card->ext_csd.raw_sec_erase_mult = 366 ext_csd[EXT_CSD_SEC_ERASE_MULT]; 367 card->ext_csd.raw_sec_feature_support = 368 ext_csd[EXT_CSD_SEC_FEATURE_SUPPORT]; 369 card->ext_csd.raw_trim_mult = 370 ext_csd[EXT_CSD_TRIM_MULT]; 371 if (card->ext_csd.rev >= 4) { 372 /* 373 * Enhanced area feature support -- check whether the eMMC 374 * card has the Enhanced area enabled. If so, export enhanced 375 * area offset and size to user by adding sysfs interface. 376 */ 377 card->ext_csd.raw_partition_support = ext_csd[EXT_CSD_PARTITION_SUPPORT]; 378 if ((ext_csd[EXT_CSD_PARTITION_SUPPORT] & 0x2) && 379 (ext_csd[EXT_CSD_PARTITION_ATTRIBUTE] & 0x1)) { 380 hc_erase_grp_sz = 381 ext_csd[EXT_CSD_HC_ERASE_GRP_SIZE]; 382 hc_wp_grp_sz = 383 ext_csd[EXT_CSD_HC_WP_GRP_SIZE]; 384 385 card->ext_csd.enhanced_area_en = 1; 386 /* 387 * calculate the enhanced data area offset, in bytes 388 */ 389 card->ext_csd.enhanced_area_offset = 390 (ext_csd[139] << 24) + (ext_csd[138] << 16) + 391 (ext_csd[137] << 8) + ext_csd[136]; 392 if (mmc_card_blockaddr(card)) 393 card->ext_csd.enhanced_area_offset <<= 9; 394 /* 395 * calculate the enhanced data area size, in kilobytes 396 */ 397 card->ext_csd.enhanced_area_size = 398 (ext_csd[142] << 16) + (ext_csd[141] << 8) + 399 ext_csd[140]; 400 card->ext_csd.enhanced_area_size *= 401 (size_t)(hc_erase_grp_sz * hc_wp_grp_sz); 402 card->ext_csd.enhanced_area_size <<= 9; 403 } else { 404 /* 405 * If the enhanced area is not enabled, disable these 406 * device attributes. 407 */ 408 card->ext_csd.enhanced_area_offset = -EINVAL; 409 card->ext_csd.enhanced_area_size = -EINVAL; 410 } 411 412 /* 413 * General purpose partition feature support -- 414 * If ext_csd has the size of general purpose partitions, 415 * set size, part_cfg, partition name in mmc_part. 416 */ 417 if (ext_csd[EXT_CSD_PARTITION_SUPPORT] & 418 EXT_CSD_PART_SUPPORT_PART_EN) { 419 if (card->ext_csd.enhanced_area_en != 1) { 420 hc_erase_grp_sz = 421 ext_csd[EXT_CSD_HC_ERASE_GRP_SIZE]; 422 hc_wp_grp_sz = 423 ext_csd[EXT_CSD_HC_WP_GRP_SIZE]; 424 425 card->ext_csd.enhanced_area_en = 1; 426 } 427 428 for (idx = 0; idx < MMC_NUM_GP_PARTITION; idx++) { 429 if (!ext_csd[EXT_CSD_GP_SIZE_MULT + idx * 3] && 430 !ext_csd[EXT_CSD_GP_SIZE_MULT + idx * 3 + 1] && 431 !ext_csd[EXT_CSD_GP_SIZE_MULT + idx * 3 + 2]) 432 continue; 433 part_size = 434 (ext_csd[EXT_CSD_GP_SIZE_MULT + idx * 3 + 2] 435 << 16) + 436 (ext_csd[EXT_CSD_GP_SIZE_MULT + idx * 3 + 1] 437 << 8) + 438 ext_csd[EXT_CSD_GP_SIZE_MULT + idx * 3]; 439 part_size *= (size_t)(hc_erase_grp_sz * 440 hc_wp_grp_sz); 441 mmc_part_add(card, part_size << 19, 442 EXT_CSD_PART_CONFIG_ACC_GP0 + idx, 443 "gp%d", idx, false, 444 MMC_BLK_DATA_AREA_GP); 445 } 446 } 447 card->ext_csd.sec_trim_mult = 448 ext_csd[EXT_CSD_SEC_TRIM_MULT]; 449 card->ext_csd.sec_erase_mult = 450 ext_csd[EXT_CSD_SEC_ERASE_MULT]; 451 card->ext_csd.sec_feature_support = 452 ext_csd[EXT_CSD_SEC_FEATURE_SUPPORT]; 453 card->ext_csd.trim_timeout = 300 * 454 ext_csd[EXT_CSD_TRIM_MULT]; 455 456 /* 457 * Note that the call to mmc_part_add above defaults to read 458 * only. If this default assumption is changed, the call must 459 * take into account the value of boot_locked below. 460 */ 461 card->ext_csd.boot_ro_lock = ext_csd[EXT_CSD_BOOT_WP]; 462 card->ext_csd.boot_ro_lockable = true; 463 } 464 465 if (card->ext_csd.rev >= 5) { 466 /* check whether the eMMC card supports BKOPS */ 467 if (ext_csd[EXT_CSD_BKOPS_SUPPORT] & 0x1) { 468 card->ext_csd.bkops = 1; 469 card->ext_csd.bkops_en = ext_csd[EXT_CSD_BKOPS_EN]; 470 card->ext_csd.raw_bkops_status = 471 ext_csd[EXT_CSD_BKOPS_STATUS]; 472 if (!card->ext_csd.bkops_en) 473 pr_info("%s: BKOPS_EN bit is not set\n", 474 mmc_hostname(card->host)); 475 } 476 477 /* check whether the eMMC card supports HPI */ 478 if (ext_csd[EXT_CSD_HPI_FEATURES] & 0x1) { 479 card->ext_csd.hpi = 1; 480 if (ext_csd[EXT_CSD_HPI_FEATURES] & 0x2) 481 card->ext_csd.hpi_cmd = MMC_STOP_TRANSMISSION; 482 else 483 card->ext_csd.hpi_cmd = MMC_SEND_STATUS; 484 /* 485 * Indicate the maximum timeout to close 486 * a command interrupted by HPI 487 */ 488 card->ext_csd.out_of_int_time = 489 ext_csd[EXT_CSD_OUT_OF_INTERRUPT_TIME] * 10; 490 } 491 492 card->ext_csd.rel_param = ext_csd[EXT_CSD_WR_REL_PARAM]; 493 card->ext_csd.rst_n_function = ext_csd[EXT_CSD_RST_N_FUNCTION]; 494 } 495 496 card->ext_csd.raw_erased_mem_count = ext_csd[EXT_CSD_ERASED_MEM_CONT]; 497 if (ext_csd[EXT_CSD_ERASED_MEM_CONT]) 498 card->erased_byte = 0xFF; 499 else 500 card->erased_byte = 0x0; 501 502 /* eMMC v4.5 or later */ 503 if (card->ext_csd.rev >= 6) { 504 card->ext_csd.feature_support |= MMC_DISCARD_FEATURE; 505 506 card->ext_csd.generic_cmd6_time = 10 * 507 ext_csd[EXT_CSD_GENERIC_CMD6_TIME]; 508 card->ext_csd.power_off_longtime = 10 * 509 ext_csd[EXT_CSD_POWER_OFF_LONG_TIME]; 510 511 card->ext_csd.cache_size = 512 ext_csd[EXT_CSD_CACHE_SIZE + 0] << 0 | 513 ext_csd[EXT_CSD_CACHE_SIZE + 1] << 8 | 514 ext_csd[EXT_CSD_CACHE_SIZE + 2] << 16 | 515 ext_csd[EXT_CSD_CACHE_SIZE + 3] << 24; 516 517 if (ext_csd[EXT_CSD_DATA_SECTOR_SIZE] == 1) 518 card->ext_csd.data_sector_size = 4096; 519 else 520 card->ext_csd.data_sector_size = 512; 521 522 if ((ext_csd[EXT_CSD_DATA_TAG_SUPPORT] & 1) && 523 (ext_csd[EXT_CSD_TAG_UNIT_SIZE] <= 8)) { 524 card->ext_csd.data_tag_unit_size = 525 ((unsigned int) 1 << ext_csd[EXT_CSD_TAG_UNIT_SIZE]) * 526 (card->ext_csd.data_sector_size); 527 } else { 528 card->ext_csd.data_tag_unit_size = 0; 529 } 530 } else { 531 card->ext_csd.data_sector_size = 512; 532 } 533 534 out: 535 return err; 536 } 537 538 static inline void mmc_free_ext_csd(u8 *ext_csd) 539 { 540 kfree(ext_csd); 541 } 542 543 544 static int mmc_compare_ext_csds(struct mmc_card *card, unsigned bus_width) 545 { 546 u8 *bw_ext_csd; 547 int err; 548 549 if (bus_width == MMC_BUS_WIDTH_1) 550 return 0; 551 552 err = mmc_get_ext_csd(card, &bw_ext_csd); 553 554 if (err || bw_ext_csd == NULL) { 555 err = -EINVAL; 556 goto out; 557 } 558 559 /* only compare read only fields */ 560 err = !((card->ext_csd.raw_partition_support == 561 bw_ext_csd[EXT_CSD_PARTITION_SUPPORT]) && 562 (card->ext_csd.raw_erased_mem_count == 563 bw_ext_csd[EXT_CSD_ERASED_MEM_CONT]) && 564 (card->ext_csd.rev == 565 bw_ext_csd[EXT_CSD_REV]) && 566 (card->ext_csd.raw_ext_csd_structure == 567 bw_ext_csd[EXT_CSD_STRUCTURE]) && 568 (card->ext_csd.raw_card_type == 569 bw_ext_csd[EXT_CSD_CARD_TYPE]) && 570 (card->ext_csd.raw_s_a_timeout == 571 bw_ext_csd[EXT_CSD_S_A_TIMEOUT]) && 572 (card->ext_csd.raw_hc_erase_gap_size == 573 bw_ext_csd[EXT_CSD_HC_WP_GRP_SIZE]) && 574 (card->ext_csd.raw_erase_timeout_mult == 575 bw_ext_csd[EXT_CSD_ERASE_TIMEOUT_MULT]) && 576 (card->ext_csd.raw_hc_erase_grp_size == 577 bw_ext_csd[EXT_CSD_HC_ERASE_GRP_SIZE]) && 578 (card->ext_csd.raw_sec_trim_mult == 579 bw_ext_csd[EXT_CSD_SEC_TRIM_MULT]) && 580 (card->ext_csd.raw_sec_erase_mult == 581 bw_ext_csd[EXT_CSD_SEC_ERASE_MULT]) && 582 (card->ext_csd.raw_sec_feature_support == 583 bw_ext_csd[EXT_CSD_SEC_FEATURE_SUPPORT]) && 584 (card->ext_csd.raw_trim_mult == 585 bw_ext_csd[EXT_CSD_TRIM_MULT]) && 586 (card->ext_csd.raw_sectors[0] == 587 bw_ext_csd[EXT_CSD_SEC_CNT + 0]) && 588 (card->ext_csd.raw_sectors[1] == 589 bw_ext_csd[EXT_CSD_SEC_CNT + 1]) && 590 (card->ext_csd.raw_sectors[2] == 591 bw_ext_csd[EXT_CSD_SEC_CNT + 2]) && 592 (card->ext_csd.raw_sectors[3] == 593 bw_ext_csd[EXT_CSD_SEC_CNT + 3])); 594 if (err) 595 err = -EINVAL; 596 597 out: 598 mmc_free_ext_csd(bw_ext_csd); 599 return err; 600 } 601 602 MMC_DEV_ATTR(cid, "%08x%08x%08x%08x\n", card->raw_cid[0], card->raw_cid[1], 603 card->raw_cid[2], card->raw_cid[3]); 604 MMC_DEV_ATTR(csd, "%08x%08x%08x%08x\n", card->raw_csd[0], card->raw_csd[1], 605 card->raw_csd[2], card->raw_csd[3]); 606 MMC_DEV_ATTR(date, "%02d/%04d\n", card->cid.month, card->cid.year); 607 MMC_DEV_ATTR(erase_size, "%u\n", card->erase_size << 9); 608 MMC_DEV_ATTR(preferred_erase_size, "%u\n", card->pref_erase << 9); 609 MMC_DEV_ATTR(fwrev, "0x%x\n", card->cid.fwrev); 610 MMC_DEV_ATTR(hwrev, "0x%x\n", card->cid.hwrev); 611 MMC_DEV_ATTR(manfid, "0x%06x\n", card->cid.manfid); 612 MMC_DEV_ATTR(name, "%s\n", card->cid.prod_name); 613 MMC_DEV_ATTR(oemid, "0x%04x\n", card->cid.oemid); 614 MMC_DEV_ATTR(serial, "0x%08x\n", card->cid.serial); 615 MMC_DEV_ATTR(enhanced_area_offset, "%llu\n", 616 card->ext_csd.enhanced_area_offset); 617 MMC_DEV_ATTR(enhanced_area_size, "%u\n", card->ext_csd.enhanced_area_size); 618 619 static struct attribute *mmc_std_attrs[] = { 620 &dev_attr_cid.attr, 621 &dev_attr_csd.attr, 622 &dev_attr_date.attr, 623 &dev_attr_erase_size.attr, 624 &dev_attr_preferred_erase_size.attr, 625 &dev_attr_fwrev.attr, 626 &dev_attr_hwrev.attr, 627 &dev_attr_manfid.attr, 628 &dev_attr_name.attr, 629 &dev_attr_oemid.attr, 630 &dev_attr_serial.attr, 631 &dev_attr_enhanced_area_offset.attr, 632 &dev_attr_enhanced_area_size.attr, 633 NULL, 634 }; 635 636 static struct attribute_group mmc_std_attr_group = { 637 .attrs = mmc_std_attrs, 638 }; 639 640 static const struct attribute_group *mmc_attr_groups[] = { 641 &mmc_std_attr_group, 642 NULL, 643 }; 644 645 static struct device_type mmc_type = { 646 .groups = mmc_attr_groups, 647 }; 648 649 /* 650 * Select the PowerClass for the current bus width 651 * If power class is defined for 4/8 bit bus in the 652 * extended CSD register, select it by executing the 653 * mmc_switch command. 654 */ 655 static int mmc_select_powerclass(struct mmc_card *card, 656 unsigned int bus_width, u8 *ext_csd) 657 { 658 int err = 0; 659 unsigned int pwrclass_val; 660 unsigned int index = 0; 661 struct mmc_host *host; 662 663 BUG_ON(!card); 664 665 host = card->host; 666 BUG_ON(!host); 667 668 if (ext_csd == NULL) 669 return 0; 670 671 /* Power class selection is supported for versions >= 4.0 */ 672 if (card->csd.mmca_vsn < CSD_SPEC_VER_4) 673 return 0; 674 675 /* Power class values are defined only for 4/8 bit bus */ 676 if (bus_width == EXT_CSD_BUS_WIDTH_1) 677 return 0; 678 679 switch (1 << host->ios.vdd) { 680 case MMC_VDD_165_195: 681 if (host->ios.clock <= 26000000) 682 index = EXT_CSD_PWR_CL_26_195; 683 else if (host->ios.clock <= 52000000) 684 index = (bus_width <= EXT_CSD_BUS_WIDTH_8) ? 685 EXT_CSD_PWR_CL_52_195 : 686 EXT_CSD_PWR_CL_DDR_52_195; 687 else if (host->ios.clock <= 200000000) 688 index = EXT_CSD_PWR_CL_200_195; 689 break; 690 case MMC_VDD_27_28: 691 case MMC_VDD_28_29: 692 case MMC_VDD_29_30: 693 case MMC_VDD_30_31: 694 case MMC_VDD_31_32: 695 case MMC_VDD_32_33: 696 case MMC_VDD_33_34: 697 case MMC_VDD_34_35: 698 case MMC_VDD_35_36: 699 if (host->ios.clock <= 26000000) 700 index = EXT_CSD_PWR_CL_26_360; 701 else if (host->ios.clock <= 52000000) 702 index = (bus_width <= EXT_CSD_BUS_WIDTH_8) ? 703 EXT_CSD_PWR_CL_52_360 : 704 EXT_CSD_PWR_CL_DDR_52_360; 705 else if (host->ios.clock <= 200000000) 706 index = EXT_CSD_PWR_CL_200_360; 707 break; 708 default: 709 pr_warning("%s: Voltage range not supported " 710 "for power class.\n", mmc_hostname(host)); 711 return -EINVAL; 712 } 713 714 pwrclass_val = ext_csd[index]; 715 716 if (bus_width & (EXT_CSD_BUS_WIDTH_8 | EXT_CSD_DDR_BUS_WIDTH_8)) 717 pwrclass_val = (pwrclass_val & EXT_CSD_PWR_CL_8BIT_MASK) >> 718 EXT_CSD_PWR_CL_8BIT_SHIFT; 719 else 720 pwrclass_val = (pwrclass_val & EXT_CSD_PWR_CL_4BIT_MASK) >> 721 EXT_CSD_PWR_CL_4BIT_SHIFT; 722 723 /* If the power class is different from the default value */ 724 if (pwrclass_val > 0) { 725 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL, 726 EXT_CSD_POWER_CLASS, 727 pwrclass_val, 728 card->ext_csd.generic_cmd6_time); 729 } 730 731 return err; 732 } 733 734 /* 735 * Selects the desired buswidth and switch to the HS200 mode 736 * if bus width set without error 737 */ 738 static int mmc_select_hs200(struct mmc_card *card) 739 { 740 int idx, err = -EINVAL; 741 struct mmc_host *host; 742 static unsigned ext_csd_bits[] = { 743 EXT_CSD_BUS_WIDTH_4, 744 EXT_CSD_BUS_WIDTH_8, 745 }; 746 static unsigned bus_widths[] = { 747 MMC_BUS_WIDTH_4, 748 MMC_BUS_WIDTH_8, 749 }; 750 751 BUG_ON(!card); 752 753 host = card->host; 754 755 if (card->ext_csd.card_type & EXT_CSD_CARD_TYPE_SDR_1_2V && 756 host->caps2 & MMC_CAP2_HS200_1_2V_SDR) 757 err = mmc_set_signal_voltage(host, MMC_SIGNAL_VOLTAGE_120, 0); 758 759 if (err && card->ext_csd.card_type & EXT_CSD_CARD_TYPE_SDR_1_8V && 760 host->caps2 & MMC_CAP2_HS200_1_8V_SDR) 761 err = mmc_set_signal_voltage(host, MMC_SIGNAL_VOLTAGE_180, 0); 762 763 /* If fails try again during next card power cycle */ 764 if (err) 765 goto err; 766 767 idx = (host->caps & MMC_CAP_8_BIT_DATA) ? 1 : 0; 768 769 /* 770 * Unlike SD, MMC cards dont have a configuration register to notify 771 * supported bus width. So bus test command should be run to identify 772 * the supported bus width or compare the ext csd values of current 773 * bus width and ext csd values of 1 bit mode read earlier. 774 */ 775 for (; idx >= 0; idx--) { 776 777 /* 778 * Host is capable of 8bit transfer, then switch 779 * the device to work in 8bit transfer mode. If the 780 * mmc switch command returns error then switch to 781 * 4bit transfer mode. On success set the corresponding 782 * bus width on the host. 783 */ 784 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL, 785 EXT_CSD_BUS_WIDTH, 786 ext_csd_bits[idx], 787 card->ext_csd.generic_cmd6_time); 788 if (err) 789 continue; 790 791 mmc_set_bus_width(card->host, bus_widths[idx]); 792 793 if (!(host->caps & MMC_CAP_BUS_WIDTH_TEST)) 794 err = mmc_compare_ext_csds(card, bus_widths[idx]); 795 else 796 err = mmc_bus_test(card, bus_widths[idx]); 797 if (!err) 798 break; 799 } 800 801 /* switch to HS200 mode if bus width set successfully */ 802 if (!err) 803 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL, 804 EXT_CSD_HS_TIMING, 2, 0); 805 err: 806 return err; 807 } 808 809 /* 810 * Handle the detection and initialisation of a card. 811 * 812 * In the case of a resume, "oldcard" will contain the card 813 * we're trying to reinitialise. 814 */ 815 static int mmc_init_card(struct mmc_host *host, u32 ocr, 816 struct mmc_card *oldcard) 817 { 818 struct mmc_card *card; 819 int err, ddr = 0; 820 u32 cid[4]; 821 unsigned int max_dtr; 822 u32 rocr; 823 u8 *ext_csd = NULL; 824 825 BUG_ON(!host); 826 WARN_ON(!host->claimed); 827 828 /* Set correct bus mode for MMC before attempting init */ 829 if (!mmc_host_is_spi(host)) 830 mmc_set_bus_mode(host, MMC_BUSMODE_OPENDRAIN); 831 832 /* 833 * Since we're changing the OCR value, we seem to 834 * need to tell some cards to go back to the idle 835 * state. We wait 1ms to give cards time to 836 * respond. 837 * mmc_go_idle is needed for eMMC that are asleep 838 */ 839 mmc_go_idle(host); 840 841 /* The extra bit indicates that we support high capacity */ 842 err = mmc_send_op_cond(host, ocr | (1 << 30), &rocr); 843 if (err) 844 goto err; 845 846 /* 847 * For SPI, enable CRC as appropriate. 848 */ 849 if (mmc_host_is_spi(host)) { 850 err = mmc_spi_set_crc(host, use_spi_crc); 851 if (err) 852 goto err; 853 } 854 855 /* 856 * Fetch CID from card. 857 */ 858 if (mmc_host_is_spi(host)) 859 err = mmc_send_cid(host, cid); 860 else 861 err = mmc_all_send_cid(host, cid); 862 if (err) 863 goto err; 864 865 if (oldcard) { 866 if (memcmp(cid, oldcard->raw_cid, sizeof(cid)) != 0) { 867 err = -ENOENT; 868 goto err; 869 } 870 871 card = oldcard; 872 } else { 873 /* 874 * Allocate card structure. 875 */ 876 card = mmc_alloc_card(host, &mmc_type); 877 if (IS_ERR(card)) { 878 err = PTR_ERR(card); 879 goto err; 880 } 881 882 card->type = MMC_TYPE_MMC; 883 card->rca = 1; 884 memcpy(card->raw_cid, cid, sizeof(card->raw_cid)); 885 } 886 887 /* 888 * For native busses: set card RCA and quit open drain mode. 889 */ 890 if (!mmc_host_is_spi(host)) { 891 err = mmc_set_relative_addr(card); 892 if (err) 893 goto free_card; 894 895 mmc_set_bus_mode(host, MMC_BUSMODE_PUSHPULL); 896 } 897 898 if (!oldcard) { 899 /* 900 * Fetch CSD from card. 901 */ 902 err = mmc_send_csd(card, card->raw_csd); 903 if (err) 904 goto free_card; 905 906 err = mmc_decode_csd(card); 907 if (err) 908 goto free_card; 909 err = mmc_decode_cid(card); 910 if (err) 911 goto free_card; 912 } 913 914 /* 915 * Select card, as all following commands rely on that. 916 */ 917 if (!mmc_host_is_spi(host)) { 918 err = mmc_select_card(card); 919 if (err) 920 goto free_card; 921 } 922 923 if (!oldcard) { 924 /* 925 * Fetch and process extended CSD. 926 */ 927 928 err = mmc_get_ext_csd(card, &ext_csd); 929 if (err) 930 goto free_card; 931 err = mmc_read_ext_csd(card, ext_csd); 932 if (err) 933 goto free_card; 934 935 /* If doing byte addressing, check if required to do sector 936 * addressing. Handle the case of <2GB cards needing sector 937 * addressing. See section 8.1 JEDEC Standard JED84-A441; 938 * ocr register has bit 30 set for sector addressing. 939 */ 940 if (!(mmc_card_blockaddr(card)) && (rocr & (1<<30))) 941 mmc_card_set_blockaddr(card); 942 943 /* Erase size depends on CSD and Extended CSD */ 944 mmc_set_erase_size(card); 945 } 946 947 /* 948 * If enhanced_area_en is TRUE, host needs to enable ERASE_GRP_DEF 949 * bit. This bit will be lost every time after a reset or power off. 950 */ 951 if (card->ext_csd.enhanced_area_en || 952 (card->ext_csd.rev >= 3 && (host->caps2 & MMC_CAP2_HC_ERASE_SZ))) { 953 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL, 954 EXT_CSD_ERASE_GROUP_DEF, 1, 955 card->ext_csd.generic_cmd6_time); 956 957 if (err && err != -EBADMSG) 958 goto free_card; 959 960 if (err) { 961 err = 0; 962 /* 963 * Just disable enhanced area off & sz 964 * will try to enable ERASE_GROUP_DEF 965 * during next time reinit 966 */ 967 card->ext_csd.enhanced_area_offset = -EINVAL; 968 card->ext_csd.enhanced_area_size = -EINVAL; 969 } else { 970 card->ext_csd.erase_group_def = 1; 971 /* 972 * enable ERASE_GRP_DEF successfully. 973 * This will affect the erase size, so 974 * here need to reset erase size 975 */ 976 mmc_set_erase_size(card); 977 } 978 } 979 980 /* 981 * Ensure eMMC user default partition is enabled 982 */ 983 if (card->ext_csd.part_config & EXT_CSD_PART_CONFIG_ACC_MASK) { 984 card->ext_csd.part_config &= ~EXT_CSD_PART_CONFIG_ACC_MASK; 985 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL, EXT_CSD_PART_CONFIG, 986 card->ext_csd.part_config, 987 card->ext_csd.part_time); 988 if (err && err != -EBADMSG) 989 goto free_card; 990 } 991 992 /* 993 * If the host supports the power_off_notify capability then 994 * set the notification byte in the ext_csd register of device 995 */ 996 if ((host->caps2 & MMC_CAP2_POWEROFF_NOTIFY) && 997 (card->ext_csd.rev >= 6)) { 998 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL, 999 EXT_CSD_POWER_OFF_NOTIFICATION, 1000 EXT_CSD_POWER_ON, 1001 card->ext_csd.generic_cmd6_time); 1002 if (err && err != -EBADMSG) 1003 goto free_card; 1004 1005 /* 1006 * The err can be -EBADMSG or 0, 1007 * so check for success and update the flag 1008 */ 1009 if (!err) 1010 card->ext_csd.power_off_notification = EXT_CSD_POWER_ON; 1011 } 1012 1013 /* 1014 * Activate high speed (if supported) 1015 */ 1016 if (card->ext_csd.hs_max_dtr != 0) { 1017 err = 0; 1018 if (card->ext_csd.hs_max_dtr > 52000000 && 1019 host->caps2 & MMC_CAP2_HS200) 1020 err = mmc_select_hs200(card); 1021 else if (host->caps & MMC_CAP_MMC_HIGHSPEED) 1022 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL, 1023 EXT_CSD_HS_TIMING, 1, 1024 card->ext_csd.generic_cmd6_time); 1025 1026 if (err && err != -EBADMSG) 1027 goto free_card; 1028 1029 if (err) { 1030 pr_warning("%s: switch to highspeed failed\n", 1031 mmc_hostname(card->host)); 1032 err = 0; 1033 } else { 1034 if (card->ext_csd.hs_max_dtr > 52000000 && 1035 host->caps2 & MMC_CAP2_HS200) { 1036 mmc_card_set_hs200(card); 1037 mmc_set_timing(card->host, 1038 MMC_TIMING_MMC_HS200); 1039 } else { 1040 mmc_card_set_highspeed(card); 1041 mmc_set_timing(card->host, MMC_TIMING_MMC_HS); 1042 } 1043 } 1044 } 1045 1046 /* 1047 * Compute bus speed. 1048 */ 1049 max_dtr = (unsigned int)-1; 1050 1051 if (mmc_card_highspeed(card) || mmc_card_hs200(card)) { 1052 if (max_dtr > card->ext_csd.hs_max_dtr) 1053 max_dtr = card->ext_csd.hs_max_dtr; 1054 } else if (max_dtr > card->csd.max_dtr) { 1055 max_dtr = card->csd.max_dtr; 1056 } 1057 1058 mmc_set_clock(host, max_dtr); 1059 1060 /* 1061 * Indicate DDR mode (if supported). 1062 */ 1063 if (mmc_card_highspeed(card)) { 1064 if ((card->ext_csd.card_type & EXT_CSD_CARD_TYPE_DDR_1_8V) 1065 && ((host->caps & (MMC_CAP_1_8V_DDR | 1066 MMC_CAP_UHS_DDR50)) 1067 == (MMC_CAP_1_8V_DDR | MMC_CAP_UHS_DDR50))) 1068 ddr = MMC_1_8V_DDR_MODE; 1069 else if ((card->ext_csd.card_type & EXT_CSD_CARD_TYPE_DDR_1_2V) 1070 && ((host->caps & (MMC_CAP_1_2V_DDR | 1071 MMC_CAP_UHS_DDR50)) 1072 == (MMC_CAP_1_2V_DDR | MMC_CAP_UHS_DDR50))) 1073 ddr = MMC_1_2V_DDR_MODE; 1074 } 1075 1076 /* 1077 * Indicate HS200 SDR mode (if supported). 1078 */ 1079 if (mmc_card_hs200(card)) { 1080 u32 ext_csd_bits; 1081 u32 bus_width = card->host->ios.bus_width; 1082 1083 /* 1084 * For devices supporting HS200 mode, the bus width has 1085 * to be set before executing the tuning function. If 1086 * set before tuning, then device will respond with CRC 1087 * errors for responses on CMD line. So for HS200 the 1088 * sequence will be 1089 * 1. set bus width 4bit / 8 bit (1 bit not supported) 1090 * 2. switch to HS200 mode 1091 * 3. set the clock to > 52Mhz <=200MHz and 1092 * 4. execute tuning for HS200 1093 */ 1094 if ((host->caps2 & MMC_CAP2_HS200) && 1095 card->host->ops->execute_tuning) { 1096 mmc_host_clk_hold(card->host); 1097 err = card->host->ops->execute_tuning(card->host, 1098 MMC_SEND_TUNING_BLOCK_HS200); 1099 mmc_host_clk_release(card->host); 1100 } 1101 if (err) { 1102 pr_warning("%s: tuning execution failed\n", 1103 mmc_hostname(card->host)); 1104 goto err; 1105 } 1106 1107 ext_csd_bits = (bus_width == MMC_BUS_WIDTH_8) ? 1108 EXT_CSD_BUS_WIDTH_8 : EXT_CSD_BUS_WIDTH_4; 1109 err = mmc_select_powerclass(card, ext_csd_bits, ext_csd); 1110 if (err) 1111 pr_warning("%s: power class selection to bus width %d" 1112 " failed\n", mmc_hostname(card->host), 1113 1 << bus_width); 1114 } 1115 1116 /* 1117 * Activate wide bus and DDR (if supported). 1118 */ 1119 if (!mmc_card_hs200(card) && 1120 (card->csd.mmca_vsn >= CSD_SPEC_VER_4) && 1121 (host->caps & (MMC_CAP_4_BIT_DATA | MMC_CAP_8_BIT_DATA))) { 1122 static unsigned ext_csd_bits[][2] = { 1123 { EXT_CSD_BUS_WIDTH_8, EXT_CSD_DDR_BUS_WIDTH_8 }, 1124 { EXT_CSD_BUS_WIDTH_4, EXT_CSD_DDR_BUS_WIDTH_4 }, 1125 { EXT_CSD_BUS_WIDTH_1, EXT_CSD_BUS_WIDTH_1 }, 1126 }; 1127 static unsigned bus_widths[] = { 1128 MMC_BUS_WIDTH_8, 1129 MMC_BUS_WIDTH_4, 1130 MMC_BUS_WIDTH_1 1131 }; 1132 unsigned idx, bus_width = 0; 1133 1134 if (host->caps & MMC_CAP_8_BIT_DATA) 1135 idx = 0; 1136 else 1137 idx = 1; 1138 for (; idx < ARRAY_SIZE(bus_widths); idx++) { 1139 bus_width = bus_widths[idx]; 1140 if (bus_width == MMC_BUS_WIDTH_1) 1141 ddr = 0; /* no DDR for 1-bit width */ 1142 err = mmc_select_powerclass(card, ext_csd_bits[idx][0], 1143 ext_csd); 1144 if (err) 1145 pr_warning("%s: power class selection to " 1146 "bus width %d failed\n", 1147 mmc_hostname(card->host), 1148 1 << bus_width); 1149 1150 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL, 1151 EXT_CSD_BUS_WIDTH, 1152 ext_csd_bits[idx][0], 1153 card->ext_csd.generic_cmd6_time); 1154 if (!err) { 1155 mmc_set_bus_width(card->host, bus_width); 1156 1157 /* 1158 * If controller can't handle bus width test, 1159 * compare ext_csd previously read in 1 bit mode 1160 * against ext_csd at new bus width 1161 */ 1162 if (!(host->caps & MMC_CAP_BUS_WIDTH_TEST)) 1163 err = mmc_compare_ext_csds(card, 1164 bus_width); 1165 else 1166 err = mmc_bus_test(card, bus_width); 1167 if (!err) 1168 break; 1169 } 1170 } 1171 1172 if (!err && ddr) { 1173 err = mmc_select_powerclass(card, ext_csd_bits[idx][1], 1174 ext_csd); 1175 if (err) 1176 pr_warning("%s: power class selection to " 1177 "bus width %d ddr %d failed\n", 1178 mmc_hostname(card->host), 1179 1 << bus_width, ddr); 1180 1181 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL, 1182 EXT_CSD_BUS_WIDTH, 1183 ext_csd_bits[idx][1], 1184 card->ext_csd.generic_cmd6_time); 1185 } 1186 if (err) { 1187 pr_warning("%s: switch to bus width %d ddr %d " 1188 "failed\n", mmc_hostname(card->host), 1189 1 << bus_width, ddr); 1190 goto free_card; 1191 } else if (ddr) { 1192 /* 1193 * eMMC cards can support 3.3V to 1.2V i/o (vccq) 1194 * signaling. 1195 * 1196 * EXT_CSD_CARD_TYPE_DDR_1_8V means 3.3V or 1.8V vccq. 1197 * 1198 * 1.8V vccq at 3.3V core voltage (vcc) is not required 1199 * in the JEDEC spec for DDR. 1200 * 1201 * Do not force change in vccq since we are obviously 1202 * working and no change to vccq is needed. 1203 * 1204 * WARNING: eMMC rules are NOT the same as SD DDR 1205 */ 1206 if (ddr == MMC_1_2V_DDR_MODE) { 1207 err = mmc_set_signal_voltage(host, 1208 MMC_SIGNAL_VOLTAGE_120, 0); 1209 if (err) 1210 goto err; 1211 } 1212 mmc_card_set_ddr_mode(card); 1213 mmc_set_timing(card->host, MMC_TIMING_UHS_DDR50); 1214 mmc_set_bus_width(card->host, bus_width); 1215 } 1216 } 1217 1218 /* 1219 * Enable HPI feature (if supported) 1220 */ 1221 if (card->ext_csd.hpi) { 1222 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL, 1223 EXT_CSD_HPI_MGMT, 1, 1224 card->ext_csd.generic_cmd6_time); 1225 if (err && err != -EBADMSG) 1226 goto free_card; 1227 if (err) { 1228 pr_warning("%s: Enabling HPI failed\n", 1229 mmc_hostname(card->host)); 1230 err = 0; 1231 } else 1232 card->ext_csd.hpi_en = 1; 1233 } 1234 1235 /* 1236 * If cache size is higher than 0, this indicates 1237 * the existence of cache and it can be turned on. 1238 */ 1239 if ((host->caps2 & MMC_CAP2_CACHE_CTRL) && 1240 card->ext_csd.cache_size > 0) { 1241 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL, 1242 EXT_CSD_CACHE_CTRL, 1, 1243 card->ext_csd.generic_cmd6_time); 1244 if (err && err != -EBADMSG) 1245 goto free_card; 1246 1247 /* 1248 * Only if no error, cache is turned on successfully. 1249 */ 1250 if (err) { 1251 pr_warning("%s: Cache is supported, " 1252 "but failed to turn on (%d)\n", 1253 mmc_hostname(card->host), err); 1254 card->ext_csd.cache_ctrl = 0; 1255 err = 0; 1256 } else { 1257 card->ext_csd.cache_ctrl = 1; 1258 } 1259 } 1260 1261 if (!oldcard) 1262 host->card = card; 1263 1264 mmc_free_ext_csd(ext_csd); 1265 return 0; 1266 1267 free_card: 1268 if (!oldcard) 1269 mmc_remove_card(card); 1270 err: 1271 mmc_free_ext_csd(ext_csd); 1272 1273 return err; 1274 } 1275 1276 static int mmc_can_poweroff_notify(const struct mmc_card *card) 1277 { 1278 return card && 1279 mmc_card_mmc(card) && 1280 (card->ext_csd.power_off_notification == EXT_CSD_POWER_ON); 1281 } 1282 1283 static int mmc_poweroff_notify(struct mmc_card *card, unsigned int notify_type) 1284 { 1285 unsigned int timeout = card->ext_csd.generic_cmd6_time; 1286 int err; 1287 1288 /* Use EXT_CSD_POWER_OFF_SHORT as default notification type. */ 1289 if (notify_type == EXT_CSD_POWER_OFF_LONG) 1290 timeout = card->ext_csd.power_off_longtime; 1291 1292 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL, 1293 EXT_CSD_POWER_OFF_NOTIFICATION, 1294 notify_type, timeout); 1295 if (err) 1296 pr_err("%s: Power Off Notification timed out, %u\n", 1297 mmc_hostname(card->host), timeout); 1298 1299 /* Disable the power off notification after the switch operation. */ 1300 card->ext_csd.power_off_notification = EXT_CSD_NO_POWER_NOTIFICATION; 1301 1302 return err; 1303 } 1304 1305 /* 1306 * Host is being removed. Free up the current card. 1307 */ 1308 static void mmc_remove(struct mmc_host *host) 1309 { 1310 BUG_ON(!host); 1311 BUG_ON(!host->card); 1312 1313 mmc_remove_card(host->card); 1314 host->card = NULL; 1315 } 1316 1317 /* 1318 * Card detection - card is alive. 1319 */ 1320 static int mmc_alive(struct mmc_host *host) 1321 { 1322 return mmc_send_status(host->card, NULL); 1323 } 1324 1325 /* 1326 * Card detection callback from host. 1327 */ 1328 static void mmc_detect(struct mmc_host *host) 1329 { 1330 int err; 1331 1332 BUG_ON(!host); 1333 BUG_ON(!host->card); 1334 1335 mmc_claim_host(host); 1336 1337 /* 1338 * Just check if our card has been removed. 1339 */ 1340 err = _mmc_detect_card_removed(host); 1341 1342 mmc_release_host(host); 1343 1344 if (err) { 1345 mmc_remove(host); 1346 1347 mmc_claim_host(host); 1348 mmc_detach_bus(host); 1349 mmc_power_off(host); 1350 mmc_release_host(host); 1351 } 1352 } 1353 1354 /* 1355 * Suspend callback from host. 1356 */ 1357 static int mmc_suspend(struct mmc_host *host) 1358 { 1359 int err = 0; 1360 1361 BUG_ON(!host); 1362 BUG_ON(!host->card); 1363 1364 mmc_claim_host(host); 1365 if (mmc_can_poweroff_notify(host->card)) 1366 err = mmc_poweroff_notify(host->card, EXT_CSD_POWER_OFF_SHORT); 1367 else if (mmc_card_can_sleep(host)) 1368 err = mmc_card_sleep(host); 1369 else if (!mmc_host_is_spi(host)) 1370 err = mmc_deselect_cards(host); 1371 host->card->state &= ~(MMC_STATE_HIGHSPEED | MMC_STATE_HIGHSPEED_200); 1372 mmc_release_host(host); 1373 1374 return err; 1375 } 1376 1377 /* 1378 * Resume callback from host. 1379 * 1380 * This function tries to determine if the same card is still present 1381 * and, if so, restore all state to it. 1382 */ 1383 static int mmc_resume(struct mmc_host *host) 1384 { 1385 int err; 1386 1387 BUG_ON(!host); 1388 BUG_ON(!host->card); 1389 1390 mmc_claim_host(host); 1391 err = mmc_init_card(host, host->ocr, host->card); 1392 mmc_release_host(host); 1393 1394 return err; 1395 } 1396 1397 static int mmc_power_restore(struct mmc_host *host) 1398 { 1399 int ret; 1400 1401 host->card->state &= ~(MMC_STATE_HIGHSPEED | MMC_STATE_HIGHSPEED_200); 1402 mmc_claim_host(host); 1403 ret = mmc_init_card(host, host->ocr, host->card); 1404 mmc_release_host(host); 1405 1406 return ret; 1407 } 1408 1409 static int mmc_sleep(struct mmc_host *host) 1410 { 1411 struct mmc_card *card = host->card; 1412 int err = -ENOSYS; 1413 1414 if (card && card->ext_csd.rev >= 3) { 1415 err = mmc_card_sleepawake(host, 1); 1416 if (err < 0) 1417 pr_debug("%s: Error %d while putting card into sleep", 1418 mmc_hostname(host), err); 1419 } 1420 1421 return err; 1422 } 1423 1424 static int mmc_awake(struct mmc_host *host) 1425 { 1426 struct mmc_card *card = host->card; 1427 int err = -ENOSYS; 1428 1429 if (card && card->ext_csd.rev >= 3) { 1430 err = mmc_card_sleepawake(host, 0); 1431 if (err < 0) 1432 pr_debug("%s: Error %d while awaking sleeping card", 1433 mmc_hostname(host), err); 1434 } 1435 1436 return err; 1437 } 1438 1439 static const struct mmc_bus_ops mmc_ops = { 1440 .awake = mmc_awake, 1441 .sleep = mmc_sleep, 1442 .remove = mmc_remove, 1443 .detect = mmc_detect, 1444 .suspend = NULL, 1445 .resume = NULL, 1446 .power_restore = mmc_power_restore, 1447 .alive = mmc_alive, 1448 }; 1449 1450 static const struct mmc_bus_ops mmc_ops_unsafe = { 1451 .awake = mmc_awake, 1452 .sleep = mmc_sleep, 1453 .remove = mmc_remove, 1454 .detect = mmc_detect, 1455 .suspend = mmc_suspend, 1456 .resume = mmc_resume, 1457 .power_restore = mmc_power_restore, 1458 .alive = mmc_alive, 1459 }; 1460 1461 static void mmc_attach_bus_ops(struct mmc_host *host) 1462 { 1463 const struct mmc_bus_ops *bus_ops; 1464 1465 if (!mmc_card_is_removable(host)) 1466 bus_ops = &mmc_ops_unsafe; 1467 else 1468 bus_ops = &mmc_ops; 1469 mmc_attach_bus(host, bus_ops); 1470 } 1471 1472 /* 1473 * Starting point for MMC card init. 1474 */ 1475 int mmc_attach_mmc(struct mmc_host *host) 1476 { 1477 int err; 1478 u32 ocr; 1479 1480 BUG_ON(!host); 1481 WARN_ON(!host->claimed); 1482 1483 /* Set correct bus mode for MMC before attempting attach */ 1484 if (!mmc_host_is_spi(host)) 1485 mmc_set_bus_mode(host, MMC_BUSMODE_OPENDRAIN); 1486 1487 err = mmc_send_op_cond(host, 0, &ocr); 1488 if (err) 1489 return err; 1490 1491 mmc_attach_bus_ops(host); 1492 if (host->ocr_avail_mmc) 1493 host->ocr_avail = host->ocr_avail_mmc; 1494 1495 /* 1496 * We need to get OCR a different way for SPI. 1497 */ 1498 if (mmc_host_is_spi(host)) { 1499 err = mmc_spi_read_ocr(host, 1, &ocr); 1500 if (err) 1501 goto err; 1502 } 1503 1504 /* 1505 * Sanity check the voltages that the card claims to 1506 * support. 1507 */ 1508 if (ocr & 0x7F) { 1509 pr_warning("%s: card claims to support voltages " 1510 "below the defined range. These will be ignored.\n", 1511 mmc_hostname(host)); 1512 ocr &= ~0x7F; 1513 } 1514 1515 host->ocr = mmc_select_voltage(host, ocr); 1516 1517 /* 1518 * Can we support the voltage of the card? 1519 */ 1520 if (!host->ocr) { 1521 err = -EINVAL; 1522 goto err; 1523 } 1524 1525 /* 1526 * Detect and init the card. 1527 */ 1528 err = mmc_init_card(host, host->ocr, NULL); 1529 if (err) 1530 goto err; 1531 1532 mmc_release_host(host); 1533 err = mmc_add_card(host->card); 1534 mmc_claim_host(host); 1535 if (err) 1536 goto remove_card; 1537 1538 return 0; 1539 1540 remove_card: 1541 mmc_release_host(host); 1542 mmc_remove_card(host->card); 1543 mmc_claim_host(host); 1544 host->card = NULL; 1545 err: 1546 mmc_detach_bus(host); 1547 1548 pr_err("%s: error %d whilst initialising MMC card\n", 1549 mmc_hostname(host), err); 1550 1551 return err; 1552 } 1553