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_SDR_ALL: 290 case EXT_CSD_CARD_TYPE_SDR_ALL_DDR_1_8V: 291 case EXT_CSD_CARD_TYPE_SDR_ALL_DDR_1_2V: 292 case EXT_CSD_CARD_TYPE_SDR_ALL_DDR_52: 293 card->ext_csd.hs_max_dtr = 200000000; 294 card->ext_csd.card_type = EXT_CSD_CARD_TYPE_SDR_200; 295 break; 296 case EXT_CSD_CARD_TYPE_SDR_1_2V_ALL: 297 case EXT_CSD_CARD_TYPE_SDR_1_2V_DDR_1_8V: 298 case EXT_CSD_CARD_TYPE_SDR_1_2V_DDR_1_2V: 299 case EXT_CSD_CARD_TYPE_SDR_1_2V_DDR_52: 300 card->ext_csd.hs_max_dtr = 200000000; 301 card->ext_csd.card_type = EXT_CSD_CARD_TYPE_SDR_1_2V; 302 break; 303 case EXT_CSD_CARD_TYPE_SDR_1_8V_ALL: 304 case EXT_CSD_CARD_TYPE_SDR_1_8V_DDR_1_8V: 305 case EXT_CSD_CARD_TYPE_SDR_1_8V_DDR_1_2V: 306 case EXT_CSD_CARD_TYPE_SDR_1_8V_DDR_52: 307 card->ext_csd.hs_max_dtr = 200000000; 308 card->ext_csd.card_type = EXT_CSD_CARD_TYPE_SDR_1_8V; 309 break; 310 case EXT_CSD_CARD_TYPE_DDR_52 | EXT_CSD_CARD_TYPE_52 | 311 EXT_CSD_CARD_TYPE_26: 312 card->ext_csd.hs_max_dtr = 52000000; 313 card->ext_csd.card_type = EXT_CSD_CARD_TYPE_DDR_52; 314 break; 315 case EXT_CSD_CARD_TYPE_DDR_1_2V | EXT_CSD_CARD_TYPE_52 | 316 EXT_CSD_CARD_TYPE_26: 317 card->ext_csd.hs_max_dtr = 52000000; 318 card->ext_csd.card_type = EXT_CSD_CARD_TYPE_DDR_1_2V; 319 break; 320 case EXT_CSD_CARD_TYPE_DDR_1_8V | EXT_CSD_CARD_TYPE_52 | 321 EXT_CSD_CARD_TYPE_26: 322 card->ext_csd.hs_max_dtr = 52000000; 323 card->ext_csd.card_type = EXT_CSD_CARD_TYPE_DDR_1_8V; 324 break; 325 case EXT_CSD_CARD_TYPE_52 | EXT_CSD_CARD_TYPE_26: 326 card->ext_csd.hs_max_dtr = 52000000; 327 break; 328 case EXT_CSD_CARD_TYPE_26: 329 card->ext_csd.hs_max_dtr = 26000000; 330 break; 331 default: 332 /* MMC v4 spec says this cannot happen */ 333 pr_warning("%s: card is mmc v4 but doesn't " 334 "support any high-speed modes.\n", 335 mmc_hostname(card->host)); 336 } 337 338 card->ext_csd.raw_s_a_timeout = ext_csd[EXT_CSD_S_A_TIMEOUT]; 339 card->ext_csd.raw_erase_timeout_mult = 340 ext_csd[EXT_CSD_ERASE_TIMEOUT_MULT]; 341 card->ext_csd.raw_hc_erase_grp_size = 342 ext_csd[EXT_CSD_HC_ERASE_GRP_SIZE]; 343 if (card->ext_csd.rev >= 3) { 344 u8 sa_shift = ext_csd[EXT_CSD_S_A_TIMEOUT]; 345 card->ext_csd.part_config = ext_csd[EXT_CSD_PART_CONFIG]; 346 347 /* EXT_CSD value is in units of 10ms, but we store in ms */ 348 card->ext_csd.part_time = 10 * ext_csd[EXT_CSD_PART_SWITCH_TIME]; 349 350 /* Sleep / awake timeout in 100ns units */ 351 if (sa_shift > 0 && sa_shift <= 0x17) 352 card->ext_csd.sa_timeout = 353 1 << ext_csd[EXT_CSD_S_A_TIMEOUT]; 354 card->ext_csd.erase_group_def = 355 ext_csd[EXT_CSD_ERASE_GROUP_DEF]; 356 card->ext_csd.hc_erase_timeout = 300 * 357 ext_csd[EXT_CSD_ERASE_TIMEOUT_MULT]; 358 card->ext_csd.hc_erase_size = 359 ext_csd[EXT_CSD_HC_ERASE_GRP_SIZE] << 10; 360 361 card->ext_csd.rel_sectors = ext_csd[EXT_CSD_REL_WR_SEC_C]; 362 363 /* 364 * There are two boot regions of equal size, defined in 365 * multiples of 128K. 366 */ 367 if (ext_csd[EXT_CSD_BOOT_MULT] && mmc_boot_partition_access(card->host)) { 368 for (idx = 0; idx < MMC_NUM_BOOT_PARTITION; idx++) { 369 part_size = ext_csd[EXT_CSD_BOOT_MULT] << 17; 370 mmc_part_add(card, part_size, 371 EXT_CSD_PART_CONFIG_ACC_BOOT0 + idx, 372 "boot%d", idx, true, 373 MMC_BLK_DATA_AREA_BOOT); 374 } 375 } 376 } 377 378 card->ext_csd.raw_hc_erase_gap_size = 379 ext_csd[EXT_CSD_HC_WP_GRP_SIZE]; 380 card->ext_csd.raw_sec_trim_mult = 381 ext_csd[EXT_CSD_SEC_TRIM_MULT]; 382 card->ext_csd.raw_sec_erase_mult = 383 ext_csd[EXT_CSD_SEC_ERASE_MULT]; 384 card->ext_csd.raw_sec_feature_support = 385 ext_csd[EXT_CSD_SEC_FEATURE_SUPPORT]; 386 card->ext_csd.raw_trim_mult = 387 ext_csd[EXT_CSD_TRIM_MULT]; 388 if (card->ext_csd.rev >= 4) { 389 /* 390 * Enhanced area feature support -- check whether the eMMC 391 * card has the Enhanced area enabled. If so, export enhanced 392 * area offset and size to user by adding sysfs interface. 393 */ 394 card->ext_csd.raw_partition_support = ext_csd[EXT_CSD_PARTITION_SUPPORT]; 395 if ((ext_csd[EXT_CSD_PARTITION_SUPPORT] & 0x2) && 396 (ext_csd[EXT_CSD_PARTITION_ATTRIBUTE] & 0x1)) { 397 hc_erase_grp_sz = 398 ext_csd[EXT_CSD_HC_ERASE_GRP_SIZE]; 399 hc_wp_grp_sz = 400 ext_csd[EXT_CSD_HC_WP_GRP_SIZE]; 401 402 card->ext_csd.enhanced_area_en = 1; 403 /* 404 * calculate the enhanced data area offset, in bytes 405 */ 406 card->ext_csd.enhanced_area_offset = 407 (ext_csd[139] << 24) + (ext_csd[138] << 16) + 408 (ext_csd[137] << 8) + ext_csd[136]; 409 if (mmc_card_blockaddr(card)) 410 card->ext_csd.enhanced_area_offset <<= 9; 411 /* 412 * calculate the enhanced data area size, in kilobytes 413 */ 414 card->ext_csd.enhanced_area_size = 415 (ext_csd[142] << 16) + (ext_csd[141] << 8) + 416 ext_csd[140]; 417 card->ext_csd.enhanced_area_size *= 418 (size_t)(hc_erase_grp_sz * hc_wp_grp_sz); 419 card->ext_csd.enhanced_area_size <<= 9; 420 } else { 421 /* 422 * If the enhanced area is not enabled, disable these 423 * device attributes. 424 */ 425 card->ext_csd.enhanced_area_offset = -EINVAL; 426 card->ext_csd.enhanced_area_size = -EINVAL; 427 } 428 429 /* 430 * General purpose partition feature support -- 431 * If ext_csd has the size of general purpose partitions, 432 * set size, part_cfg, partition name in mmc_part. 433 */ 434 if (ext_csd[EXT_CSD_PARTITION_SUPPORT] & 435 EXT_CSD_PART_SUPPORT_PART_EN) { 436 if (card->ext_csd.enhanced_area_en != 1) { 437 hc_erase_grp_sz = 438 ext_csd[EXT_CSD_HC_ERASE_GRP_SIZE]; 439 hc_wp_grp_sz = 440 ext_csd[EXT_CSD_HC_WP_GRP_SIZE]; 441 442 card->ext_csd.enhanced_area_en = 1; 443 } 444 445 for (idx = 0; idx < MMC_NUM_GP_PARTITION; idx++) { 446 if (!ext_csd[EXT_CSD_GP_SIZE_MULT + idx * 3] && 447 !ext_csd[EXT_CSD_GP_SIZE_MULT + idx * 3 + 1] && 448 !ext_csd[EXT_CSD_GP_SIZE_MULT + idx * 3 + 2]) 449 continue; 450 part_size = 451 (ext_csd[EXT_CSD_GP_SIZE_MULT + idx * 3 + 2] 452 << 16) + 453 (ext_csd[EXT_CSD_GP_SIZE_MULT + idx * 3 + 1] 454 << 8) + 455 ext_csd[EXT_CSD_GP_SIZE_MULT + idx * 3]; 456 part_size *= (size_t)(hc_erase_grp_sz * 457 hc_wp_grp_sz); 458 mmc_part_add(card, part_size << 19, 459 EXT_CSD_PART_CONFIG_ACC_GP0 + idx, 460 "gp%d", idx, false, 461 MMC_BLK_DATA_AREA_GP); 462 } 463 } 464 card->ext_csd.sec_trim_mult = 465 ext_csd[EXT_CSD_SEC_TRIM_MULT]; 466 card->ext_csd.sec_erase_mult = 467 ext_csd[EXT_CSD_SEC_ERASE_MULT]; 468 card->ext_csd.sec_feature_support = 469 ext_csd[EXT_CSD_SEC_FEATURE_SUPPORT]; 470 card->ext_csd.trim_timeout = 300 * 471 ext_csd[EXT_CSD_TRIM_MULT]; 472 473 /* 474 * Note that the call to mmc_part_add above defaults to read 475 * only. If this default assumption is changed, the call must 476 * take into account the value of boot_locked below. 477 */ 478 card->ext_csd.boot_ro_lock = ext_csd[EXT_CSD_BOOT_WP]; 479 card->ext_csd.boot_ro_lockable = true; 480 } 481 482 if (card->ext_csd.rev >= 5) { 483 /* check whether the eMMC card supports HPI */ 484 if (ext_csd[EXT_CSD_HPI_FEATURES] & 0x1) { 485 card->ext_csd.hpi = 1; 486 if (ext_csd[EXT_CSD_HPI_FEATURES] & 0x2) 487 card->ext_csd.hpi_cmd = MMC_STOP_TRANSMISSION; 488 else 489 card->ext_csd.hpi_cmd = MMC_SEND_STATUS; 490 /* 491 * Indicate the maximum timeout to close 492 * a command interrupted by HPI 493 */ 494 card->ext_csd.out_of_int_time = 495 ext_csd[EXT_CSD_OUT_OF_INTERRUPT_TIME] * 10; 496 } 497 498 card->ext_csd.rel_param = ext_csd[EXT_CSD_WR_REL_PARAM]; 499 card->ext_csd.rst_n_function = ext_csd[EXT_CSD_RST_N_FUNCTION]; 500 } 501 502 card->ext_csd.raw_erased_mem_count = ext_csd[EXT_CSD_ERASED_MEM_CONT]; 503 if (ext_csd[EXT_CSD_ERASED_MEM_CONT]) 504 card->erased_byte = 0xFF; 505 else 506 card->erased_byte = 0x0; 507 508 /* eMMC v4.5 or later */ 509 if (card->ext_csd.rev >= 6) { 510 card->ext_csd.feature_support |= MMC_DISCARD_FEATURE; 511 512 card->ext_csd.generic_cmd6_time = 10 * 513 ext_csd[EXT_CSD_GENERIC_CMD6_TIME]; 514 card->ext_csd.power_off_longtime = 10 * 515 ext_csd[EXT_CSD_POWER_OFF_LONG_TIME]; 516 517 card->ext_csd.cache_size = 518 ext_csd[EXT_CSD_CACHE_SIZE + 0] << 0 | 519 ext_csd[EXT_CSD_CACHE_SIZE + 1] << 8 | 520 ext_csd[EXT_CSD_CACHE_SIZE + 2] << 16 | 521 ext_csd[EXT_CSD_CACHE_SIZE + 3] << 24; 522 } 523 524 out: 525 return err; 526 } 527 528 static inline void mmc_free_ext_csd(u8 *ext_csd) 529 { 530 kfree(ext_csd); 531 } 532 533 534 static int mmc_compare_ext_csds(struct mmc_card *card, unsigned bus_width) 535 { 536 u8 *bw_ext_csd; 537 int err; 538 539 if (bus_width == MMC_BUS_WIDTH_1) 540 return 0; 541 542 err = mmc_get_ext_csd(card, &bw_ext_csd); 543 544 if (err || bw_ext_csd == NULL) { 545 if (bus_width != MMC_BUS_WIDTH_1) 546 err = -EINVAL; 547 goto out; 548 } 549 550 if (bus_width == MMC_BUS_WIDTH_1) 551 goto out; 552 553 /* only compare read only fields */ 554 err = !((card->ext_csd.raw_partition_support == 555 bw_ext_csd[EXT_CSD_PARTITION_SUPPORT]) && 556 (card->ext_csd.raw_erased_mem_count == 557 bw_ext_csd[EXT_CSD_ERASED_MEM_CONT]) && 558 (card->ext_csd.rev == 559 bw_ext_csd[EXT_CSD_REV]) && 560 (card->ext_csd.raw_ext_csd_structure == 561 bw_ext_csd[EXT_CSD_STRUCTURE]) && 562 (card->ext_csd.raw_card_type == 563 bw_ext_csd[EXT_CSD_CARD_TYPE]) && 564 (card->ext_csd.raw_s_a_timeout == 565 bw_ext_csd[EXT_CSD_S_A_TIMEOUT]) && 566 (card->ext_csd.raw_hc_erase_gap_size == 567 bw_ext_csd[EXT_CSD_HC_WP_GRP_SIZE]) && 568 (card->ext_csd.raw_erase_timeout_mult == 569 bw_ext_csd[EXT_CSD_ERASE_TIMEOUT_MULT]) && 570 (card->ext_csd.raw_hc_erase_grp_size == 571 bw_ext_csd[EXT_CSD_HC_ERASE_GRP_SIZE]) && 572 (card->ext_csd.raw_sec_trim_mult == 573 bw_ext_csd[EXT_CSD_SEC_TRIM_MULT]) && 574 (card->ext_csd.raw_sec_erase_mult == 575 bw_ext_csd[EXT_CSD_SEC_ERASE_MULT]) && 576 (card->ext_csd.raw_sec_feature_support == 577 bw_ext_csd[EXT_CSD_SEC_FEATURE_SUPPORT]) && 578 (card->ext_csd.raw_trim_mult == 579 bw_ext_csd[EXT_CSD_TRIM_MULT]) && 580 (card->ext_csd.raw_sectors[0] == 581 bw_ext_csd[EXT_CSD_SEC_CNT + 0]) && 582 (card->ext_csd.raw_sectors[1] == 583 bw_ext_csd[EXT_CSD_SEC_CNT + 1]) && 584 (card->ext_csd.raw_sectors[2] == 585 bw_ext_csd[EXT_CSD_SEC_CNT + 2]) && 586 (card->ext_csd.raw_sectors[3] == 587 bw_ext_csd[EXT_CSD_SEC_CNT + 3])); 588 if (err) 589 err = -EINVAL; 590 591 out: 592 mmc_free_ext_csd(bw_ext_csd); 593 return err; 594 } 595 596 MMC_DEV_ATTR(cid, "%08x%08x%08x%08x\n", card->raw_cid[0], card->raw_cid[1], 597 card->raw_cid[2], card->raw_cid[3]); 598 MMC_DEV_ATTR(csd, "%08x%08x%08x%08x\n", card->raw_csd[0], card->raw_csd[1], 599 card->raw_csd[2], card->raw_csd[3]); 600 MMC_DEV_ATTR(date, "%02d/%04d\n", card->cid.month, card->cid.year); 601 MMC_DEV_ATTR(erase_size, "%u\n", card->erase_size << 9); 602 MMC_DEV_ATTR(preferred_erase_size, "%u\n", card->pref_erase << 9); 603 MMC_DEV_ATTR(fwrev, "0x%x\n", card->cid.fwrev); 604 MMC_DEV_ATTR(hwrev, "0x%x\n", card->cid.hwrev); 605 MMC_DEV_ATTR(manfid, "0x%06x\n", card->cid.manfid); 606 MMC_DEV_ATTR(name, "%s\n", card->cid.prod_name); 607 MMC_DEV_ATTR(oemid, "0x%04x\n", card->cid.oemid); 608 MMC_DEV_ATTR(serial, "0x%08x\n", card->cid.serial); 609 MMC_DEV_ATTR(enhanced_area_offset, "%llu\n", 610 card->ext_csd.enhanced_area_offset); 611 MMC_DEV_ATTR(enhanced_area_size, "%u\n", card->ext_csd.enhanced_area_size); 612 613 static struct attribute *mmc_std_attrs[] = { 614 &dev_attr_cid.attr, 615 &dev_attr_csd.attr, 616 &dev_attr_date.attr, 617 &dev_attr_erase_size.attr, 618 &dev_attr_preferred_erase_size.attr, 619 &dev_attr_fwrev.attr, 620 &dev_attr_hwrev.attr, 621 &dev_attr_manfid.attr, 622 &dev_attr_name.attr, 623 &dev_attr_oemid.attr, 624 &dev_attr_serial.attr, 625 &dev_attr_enhanced_area_offset.attr, 626 &dev_attr_enhanced_area_size.attr, 627 NULL, 628 }; 629 630 static struct attribute_group mmc_std_attr_group = { 631 .attrs = mmc_std_attrs, 632 }; 633 634 static const struct attribute_group *mmc_attr_groups[] = { 635 &mmc_std_attr_group, 636 NULL, 637 }; 638 639 static struct device_type mmc_type = { 640 .groups = mmc_attr_groups, 641 }; 642 643 /* 644 * Select the PowerClass for the current bus width 645 * If power class is defined for 4/8 bit bus in the 646 * extended CSD register, select it by executing the 647 * mmc_switch command. 648 */ 649 static int mmc_select_powerclass(struct mmc_card *card, 650 unsigned int bus_width, u8 *ext_csd) 651 { 652 int err = 0; 653 unsigned int pwrclass_val; 654 unsigned int index = 0; 655 struct mmc_host *host; 656 657 BUG_ON(!card); 658 659 host = card->host; 660 BUG_ON(!host); 661 662 if (ext_csd == NULL) 663 return 0; 664 665 /* Power class selection is supported for versions >= 4.0 */ 666 if (card->csd.mmca_vsn < CSD_SPEC_VER_4) 667 return 0; 668 669 /* Power class values are defined only for 4/8 bit bus */ 670 if (bus_width == EXT_CSD_BUS_WIDTH_1) 671 return 0; 672 673 switch (1 << host->ios.vdd) { 674 case MMC_VDD_165_195: 675 if (host->ios.clock <= 26000000) 676 index = EXT_CSD_PWR_CL_26_195; 677 else if (host->ios.clock <= 52000000) 678 index = (bus_width <= EXT_CSD_BUS_WIDTH_8) ? 679 EXT_CSD_PWR_CL_52_195 : 680 EXT_CSD_PWR_CL_DDR_52_195; 681 else if (host->ios.clock <= 200000000) 682 index = EXT_CSD_PWR_CL_200_195; 683 break; 684 case MMC_VDD_32_33: 685 case MMC_VDD_33_34: 686 case MMC_VDD_34_35: 687 case MMC_VDD_35_36: 688 if (host->ios.clock <= 26000000) 689 index = EXT_CSD_PWR_CL_26_360; 690 else if (host->ios.clock <= 52000000) 691 index = (bus_width <= EXT_CSD_BUS_WIDTH_8) ? 692 EXT_CSD_PWR_CL_52_360 : 693 EXT_CSD_PWR_CL_DDR_52_360; 694 else if (host->ios.clock <= 200000000) 695 index = EXT_CSD_PWR_CL_200_360; 696 break; 697 default: 698 pr_warning("%s: Voltage range not supported " 699 "for power class.\n", mmc_hostname(host)); 700 return -EINVAL; 701 } 702 703 pwrclass_val = ext_csd[index]; 704 705 if (bus_width & (EXT_CSD_BUS_WIDTH_8 | EXT_CSD_DDR_BUS_WIDTH_8)) 706 pwrclass_val = (pwrclass_val & EXT_CSD_PWR_CL_8BIT_MASK) >> 707 EXT_CSD_PWR_CL_8BIT_SHIFT; 708 else 709 pwrclass_val = (pwrclass_val & EXT_CSD_PWR_CL_4BIT_MASK) >> 710 EXT_CSD_PWR_CL_4BIT_SHIFT; 711 712 /* If the power class is different from the default value */ 713 if (pwrclass_val > 0) { 714 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL, 715 EXT_CSD_POWER_CLASS, 716 pwrclass_val, 717 card->ext_csd.generic_cmd6_time); 718 } 719 720 return err; 721 } 722 723 /* 724 * Selects the desired buswidth and switch to the HS200 mode 725 * if bus width set without error 726 */ 727 static int mmc_select_hs200(struct mmc_card *card) 728 { 729 int idx, err = 0; 730 struct mmc_host *host; 731 static unsigned ext_csd_bits[] = { 732 EXT_CSD_BUS_WIDTH_4, 733 EXT_CSD_BUS_WIDTH_8, 734 }; 735 static unsigned bus_widths[] = { 736 MMC_BUS_WIDTH_4, 737 MMC_BUS_WIDTH_8, 738 }; 739 740 BUG_ON(!card); 741 742 host = card->host; 743 744 if (card->ext_csd.card_type & EXT_CSD_CARD_TYPE_SDR_1_2V && 745 host->caps2 & MMC_CAP2_HS200_1_2V_SDR) 746 if (mmc_set_signal_voltage(host, MMC_SIGNAL_VOLTAGE_120, 0)) 747 err = mmc_set_signal_voltage(host, 748 MMC_SIGNAL_VOLTAGE_180, 0); 749 750 /* If fails try again during next card power cycle */ 751 if (err) 752 goto err; 753 754 idx = (host->caps & MMC_CAP_8_BIT_DATA) ? 1 : 0; 755 756 /* 757 * Unlike SD, MMC cards dont have a configuration register to notify 758 * supported bus width. So bus test command should be run to identify 759 * the supported bus width or compare the ext csd values of current 760 * bus width and ext csd values of 1 bit mode read earlier. 761 */ 762 for (; idx >= 0; idx--) { 763 764 /* 765 * Host is capable of 8bit transfer, then switch 766 * the device to work in 8bit transfer mode. If the 767 * mmc switch command returns error then switch to 768 * 4bit transfer mode. On success set the corresponding 769 * bus width on the host. 770 */ 771 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL, 772 EXT_CSD_BUS_WIDTH, 773 ext_csd_bits[idx], 774 card->ext_csd.generic_cmd6_time); 775 if (err) 776 continue; 777 778 mmc_set_bus_width(card->host, bus_widths[idx]); 779 780 if (!(host->caps & MMC_CAP_BUS_WIDTH_TEST)) 781 err = mmc_compare_ext_csds(card, bus_widths[idx]); 782 else 783 err = mmc_bus_test(card, bus_widths[idx]); 784 if (!err) 785 break; 786 } 787 788 /* switch to HS200 mode if bus width set successfully */ 789 if (!err) 790 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL, 791 EXT_CSD_HS_TIMING, 2, 0); 792 err: 793 return err; 794 } 795 796 /* 797 * Handle the detection and initialisation of a card. 798 * 799 * In the case of a resume, "oldcard" will contain the card 800 * we're trying to reinitialise. 801 */ 802 static int mmc_init_card(struct mmc_host *host, u32 ocr, 803 struct mmc_card *oldcard) 804 { 805 struct mmc_card *card; 806 int err, ddr = 0; 807 u32 cid[4]; 808 unsigned int max_dtr; 809 u32 rocr; 810 u8 *ext_csd = NULL; 811 812 BUG_ON(!host); 813 WARN_ON(!host->claimed); 814 815 /* Set correct bus mode for MMC before attempting init */ 816 if (!mmc_host_is_spi(host)) 817 mmc_set_bus_mode(host, MMC_BUSMODE_OPENDRAIN); 818 819 /* Initialization should be done at 3.3 V I/O voltage. */ 820 mmc_set_signal_voltage(host, MMC_SIGNAL_VOLTAGE_330, 0); 821 822 /* 823 * Since we're changing the OCR value, we seem to 824 * need to tell some cards to go back to the idle 825 * state. We wait 1ms to give cards time to 826 * respond. 827 * mmc_go_idle is needed for eMMC that are asleep 828 */ 829 mmc_go_idle(host); 830 831 /* The extra bit indicates that we support high capacity */ 832 err = mmc_send_op_cond(host, ocr | (1 << 30), &rocr); 833 if (err) 834 goto err; 835 836 /* 837 * For SPI, enable CRC as appropriate. 838 */ 839 if (mmc_host_is_spi(host)) { 840 err = mmc_spi_set_crc(host, use_spi_crc); 841 if (err) 842 goto err; 843 } 844 845 /* 846 * Fetch CID from card. 847 */ 848 if (mmc_host_is_spi(host)) 849 err = mmc_send_cid(host, cid); 850 else 851 err = mmc_all_send_cid(host, cid); 852 if (err) 853 goto err; 854 855 if (oldcard) { 856 if (memcmp(cid, oldcard->raw_cid, sizeof(cid)) != 0) { 857 err = -ENOENT; 858 goto err; 859 } 860 861 card = oldcard; 862 } else { 863 /* 864 * Allocate card structure. 865 */ 866 card = mmc_alloc_card(host, &mmc_type); 867 if (IS_ERR(card)) { 868 err = PTR_ERR(card); 869 goto err; 870 } 871 872 card->type = MMC_TYPE_MMC; 873 card->rca = 1; 874 memcpy(card->raw_cid, cid, sizeof(card->raw_cid)); 875 } 876 877 /* 878 * For native busses: set card RCA and quit open drain mode. 879 */ 880 if (!mmc_host_is_spi(host)) { 881 err = mmc_set_relative_addr(card); 882 if (err) 883 goto free_card; 884 885 mmc_set_bus_mode(host, MMC_BUSMODE_PUSHPULL); 886 } 887 888 if (!oldcard) { 889 /* 890 * Fetch CSD from card. 891 */ 892 err = mmc_send_csd(card, card->raw_csd); 893 if (err) 894 goto free_card; 895 896 err = mmc_decode_csd(card); 897 if (err) 898 goto free_card; 899 err = mmc_decode_cid(card); 900 if (err) 901 goto free_card; 902 } 903 904 /* 905 * Select card, as all following commands rely on that. 906 */ 907 if (!mmc_host_is_spi(host)) { 908 err = mmc_select_card(card); 909 if (err) 910 goto free_card; 911 } 912 913 if (!oldcard) { 914 /* 915 * Fetch and process extended CSD. 916 */ 917 918 err = mmc_get_ext_csd(card, &ext_csd); 919 if (err) 920 goto free_card; 921 err = mmc_read_ext_csd(card, ext_csd); 922 if (err) 923 goto free_card; 924 925 /* If doing byte addressing, check if required to do sector 926 * addressing. Handle the case of <2GB cards needing sector 927 * addressing. See section 8.1 JEDEC Standard JED84-A441; 928 * ocr register has bit 30 set for sector addressing. 929 */ 930 if (!(mmc_card_blockaddr(card)) && (rocr & (1<<30))) 931 mmc_card_set_blockaddr(card); 932 933 /* Erase size depends on CSD and Extended CSD */ 934 mmc_set_erase_size(card); 935 } 936 937 /* 938 * If enhanced_area_en is TRUE, host needs to enable ERASE_GRP_DEF 939 * bit. This bit will be lost every time after a reset or power off. 940 */ 941 if (card->ext_csd.enhanced_area_en) { 942 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL, 943 EXT_CSD_ERASE_GROUP_DEF, 1, 944 card->ext_csd.generic_cmd6_time); 945 946 if (err && err != -EBADMSG) 947 goto free_card; 948 949 if (err) { 950 err = 0; 951 /* 952 * Just disable enhanced area off & sz 953 * will try to enable ERASE_GROUP_DEF 954 * during next time reinit 955 */ 956 card->ext_csd.enhanced_area_offset = -EINVAL; 957 card->ext_csd.enhanced_area_size = -EINVAL; 958 } else { 959 card->ext_csd.erase_group_def = 1; 960 /* 961 * enable ERASE_GRP_DEF successfully. 962 * This will affect the erase size, so 963 * here need to reset erase size 964 */ 965 mmc_set_erase_size(card); 966 } 967 } 968 969 /* 970 * Ensure eMMC user default partition is enabled 971 */ 972 if (card->ext_csd.part_config & EXT_CSD_PART_CONFIG_ACC_MASK) { 973 card->ext_csd.part_config &= ~EXT_CSD_PART_CONFIG_ACC_MASK; 974 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL, EXT_CSD_PART_CONFIG, 975 card->ext_csd.part_config, 976 card->ext_csd.part_time); 977 if (err && err != -EBADMSG) 978 goto free_card; 979 } 980 981 /* 982 * If the host supports the power_off_notify capability then 983 * set the notification byte in the ext_csd register of device 984 */ 985 if ((host->caps2 & MMC_CAP2_POWEROFF_NOTIFY) && 986 (card->ext_csd.rev >= 6)) { 987 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL, 988 EXT_CSD_POWER_OFF_NOTIFICATION, 989 EXT_CSD_POWER_ON, 990 card->ext_csd.generic_cmd6_time); 991 if (err && err != -EBADMSG) 992 goto free_card; 993 994 /* 995 * The err can be -EBADMSG or 0, 996 * so check for success and update the flag 997 */ 998 if (!err) 999 card->poweroff_notify_state = MMC_POWERED_ON; 1000 } 1001 1002 /* 1003 * Activate high speed (if supported) 1004 */ 1005 if (card->ext_csd.hs_max_dtr != 0) { 1006 err = 0; 1007 if (card->ext_csd.hs_max_dtr > 52000000 && 1008 host->caps2 & MMC_CAP2_HS200) 1009 err = mmc_select_hs200(card); 1010 else if (host->caps & MMC_CAP_MMC_HIGHSPEED) 1011 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL, 1012 EXT_CSD_HS_TIMING, 1, 1013 card->ext_csd.generic_cmd6_time); 1014 1015 if (err && err != -EBADMSG) 1016 goto free_card; 1017 1018 if (err) { 1019 pr_warning("%s: switch to highspeed failed\n", 1020 mmc_hostname(card->host)); 1021 err = 0; 1022 } else { 1023 if (card->ext_csd.hs_max_dtr > 52000000 && 1024 host->caps2 & MMC_CAP2_HS200) { 1025 mmc_card_set_hs200(card); 1026 mmc_set_timing(card->host, 1027 MMC_TIMING_MMC_HS200); 1028 } else { 1029 mmc_card_set_highspeed(card); 1030 mmc_set_timing(card->host, MMC_TIMING_MMC_HS); 1031 } 1032 } 1033 } 1034 1035 /* 1036 * Enable HPI feature (if supported) 1037 */ 1038 if (card->ext_csd.hpi) { 1039 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL, 1040 EXT_CSD_HPI_MGMT, 1, 0); 1041 if (err && err != -EBADMSG) 1042 goto free_card; 1043 if (err) { 1044 pr_warning("%s: Enabling HPI failed\n", 1045 mmc_hostname(card->host)); 1046 err = 0; 1047 } else 1048 card->ext_csd.hpi_en = 1; 1049 } 1050 1051 /* 1052 * Compute bus speed. 1053 */ 1054 max_dtr = (unsigned int)-1; 1055 1056 if (mmc_card_highspeed(card) || mmc_card_hs200(card)) { 1057 if (max_dtr > card->ext_csd.hs_max_dtr) 1058 max_dtr = card->ext_csd.hs_max_dtr; 1059 } else if (max_dtr > card->csd.max_dtr) { 1060 max_dtr = card->csd.max_dtr; 1061 } 1062 1063 mmc_set_clock(host, max_dtr); 1064 1065 /* 1066 * Indicate DDR mode (if supported). 1067 */ 1068 if (mmc_card_highspeed(card)) { 1069 if ((card->ext_csd.card_type & EXT_CSD_CARD_TYPE_DDR_1_8V) 1070 && ((host->caps & (MMC_CAP_1_8V_DDR | 1071 MMC_CAP_UHS_DDR50)) 1072 == (MMC_CAP_1_8V_DDR | MMC_CAP_UHS_DDR50))) 1073 ddr = MMC_1_8V_DDR_MODE; 1074 else if ((card->ext_csd.card_type & EXT_CSD_CARD_TYPE_DDR_1_2V) 1075 && ((host->caps & (MMC_CAP_1_2V_DDR | 1076 MMC_CAP_UHS_DDR50)) 1077 == (MMC_CAP_1_2V_DDR | MMC_CAP_UHS_DDR50))) 1078 ddr = MMC_1_2V_DDR_MODE; 1079 } 1080 1081 /* 1082 * Indicate HS200 SDR mode (if supported). 1083 */ 1084 if (mmc_card_hs200(card)) { 1085 u32 ext_csd_bits; 1086 u32 bus_width = card->host->ios.bus_width; 1087 1088 /* 1089 * For devices supporting HS200 mode, the bus width has 1090 * to be set before executing the tuning function. If 1091 * set before tuning, then device will respond with CRC 1092 * errors for responses on CMD line. So for HS200 the 1093 * sequence will be 1094 * 1. set bus width 4bit / 8 bit (1 bit not supported) 1095 * 2. switch to HS200 mode 1096 * 3. set the clock to > 52Mhz <=200MHz and 1097 * 4. execute tuning for HS200 1098 */ 1099 if ((host->caps2 & MMC_CAP2_HS200) && 1100 card->host->ops->execute_tuning) 1101 err = card->host->ops->execute_tuning(card->host, 1102 MMC_SEND_TUNING_BLOCK_HS200); 1103 if (err) { 1104 pr_warning("%s: tuning execution failed\n", 1105 mmc_hostname(card->host)); 1106 goto err; 1107 } 1108 1109 ext_csd_bits = (bus_width == MMC_BUS_WIDTH_8) ? 1110 EXT_CSD_BUS_WIDTH_8 : EXT_CSD_BUS_WIDTH_4; 1111 err = mmc_select_powerclass(card, ext_csd_bits, ext_csd); 1112 if (err) { 1113 pr_err("%s: power class selection to bus width %d failed\n", 1114 mmc_hostname(card->host), 1 << bus_width); 1115 goto err; 1116 } 1117 } 1118 1119 /* 1120 * Activate wide bus and DDR (if supported). 1121 */ 1122 if (!mmc_card_hs200(card) && 1123 (card->csd.mmca_vsn >= CSD_SPEC_VER_4) && 1124 (host->caps & (MMC_CAP_4_BIT_DATA | MMC_CAP_8_BIT_DATA))) { 1125 static unsigned ext_csd_bits[][2] = { 1126 { EXT_CSD_BUS_WIDTH_8, EXT_CSD_DDR_BUS_WIDTH_8 }, 1127 { EXT_CSD_BUS_WIDTH_4, EXT_CSD_DDR_BUS_WIDTH_4 }, 1128 { EXT_CSD_BUS_WIDTH_1, EXT_CSD_BUS_WIDTH_1 }, 1129 }; 1130 static unsigned bus_widths[] = { 1131 MMC_BUS_WIDTH_8, 1132 MMC_BUS_WIDTH_4, 1133 MMC_BUS_WIDTH_1 1134 }; 1135 unsigned idx, bus_width = 0; 1136 1137 if (host->caps & MMC_CAP_8_BIT_DATA) 1138 idx = 0; 1139 else 1140 idx = 1; 1141 for (; idx < ARRAY_SIZE(bus_widths); idx++) { 1142 bus_width = bus_widths[idx]; 1143 if (bus_width == MMC_BUS_WIDTH_1) 1144 ddr = 0; /* no DDR for 1-bit width */ 1145 err = mmc_select_powerclass(card, ext_csd_bits[idx][0], 1146 ext_csd); 1147 if (err) 1148 pr_err("%s: power class selection to " 1149 "bus width %d failed\n", 1150 mmc_hostname(card->host), 1151 1 << bus_width); 1152 1153 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL, 1154 EXT_CSD_BUS_WIDTH, 1155 ext_csd_bits[idx][0], 1156 card->ext_csd.generic_cmd6_time); 1157 if (!err) { 1158 mmc_set_bus_width(card->host, bus_width); 1159 1160 /* 1161 * If controller can't handle bus width test, 1162 * compare ext_csd previously read in 1 bit mode 1163 * against ext_csd at new bus width 1164 */ 1165 if (!(host->caps & MMC_CAP_BUS_WIDTH_TEST)) 1166 err = mmc_compare_ext_csds(card, 1167 bus_width); 1168 else 1169 err = mmc_bus_test(card, bus_width); 1170 if (!err) 1171 break; 1172 } 1173 } 1174 1175 if (!err && ddr) { 1176 err = mmc_select_powerclass(card, ext_csd_bits[idx][1], 1177 ext_csd); 1178 if (err) 1179 pr_err("%s: power class selection to " 1180 "bus width %d ddr %d failed\n", 1181 mmc_hostname(card->host), 1182 1 << bus_width, ddr); 1183 1184 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL, 1185 EXT_CSD_BUS_WIDTH, 1186 ext_csd_bits[idx][1], 1187 card->ext_csd.generic_cmd6_time); 1188 } 1189 if (err) { 1190 pr_warning("%s: switch to bus width %d ddr %d " 1191 "failed\n", mmc_hostname(card->host), 1192 1 << bus_width, ddr); 1193 goto free_card; 1194 } else if (ddr) { 1195 /* 1196 * eMMC cards can support 3.3V to 1.2V i/o (vccq) 1197 * signaling. 1198 * 1199 * EXT_CSD_CARD_TYPE_DDR_1_8V means 3.3V or 1.8V vccq. 1200 * 1201 * 1.8V vccq at 3.3V core voltage (vcc) is not required 1202 * in the JEDEC spec for DDR. 1203 * 1204 * Do not force change in vccq since we are obviously 1205 * working and no change to vccq is needed. 1206 * 1207 * WARNING: eMMC rules are NOT the same as SD DDR 1208 */ 1209 if (ddr == MMC_1_2V_DDR_MODE) { 1210 err = mmc_set_signal_voltage(host, 1211 MMC_SIGNAL_VOLTAGE_120, 0); 1212 if (err) 1213 goto err; 1214 } 1215 mmc_card_set_ddr_mode(card); 1216 mmc_set_timing(card->host, MMC_TIMING_UHS_DDR50); 1217 mmc_set_bus_width(card->host, bus_width); 1218 } 1219 } 1220 1221 /* 1222 * If cache size is higher than 0, this indicates 1223 * the existence of cache and it can be turned on. 1224 */ 1225 if ((host->caps2 & MMC_CAP2_CACHE_CTRL) && 1226 card->ext_csd.cache_size > 0) { 1227 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL, 1228 EXT_CSD_CACHE_CTRL, 1, 1229 card->ext_csd.generic_cmd6_time); 1230 if (err && err != -EBADMSG) 1231 goto free_card; 1232 1233 /* 1234 * Only if no error, cache is turned on successfully. 1235 */ 1236 if (err) { 1237 pr_warning("%s: Cache is supported, " 1238 "but failed to turn on (%d)\n", 1239 mmc_hostname(card->host), err); 1240 card->ext_csd.cache_ctrl = 0; 1241 err = 0; 1242 } else { 1243 card->ext_csd.cache_ctrl = 1; 1244 } 1245 } 1246 1247 if (!oldcard) 1248 host->card = card; 1249 1250 mmc_free_ext_csd(ext_csd); 1251 return 0; 1252 1253 free_card: 1254 if (!oldcard) 1255 mmc_remove_card(card); 1256 err: 1257 mmc_free_ext_csd(ext_csd); 1258 1259 return err; 1260 } 1261 1262 /* 1263 * Host is being removed. Free up the current card. 1264 */ 1265 static void mmc_remove(struct mmc_host *host) 1266 { 1267 BUG_ON(!host); 1268 BUG_ON(!host->card); 1269 1270 mmc_remove_card(host->card); 1271 host->card = NULL; 1272 } 1273 1274 /* 1275 * Card detection - card is alive. 1276 */ 1277 static int mmc_alive(struct mmc_host *host) 1278 { 1279 return mmc_send_status(host->card, NULL); 1280 } 1281 1282 /* 1283 * Card detection callback from host. 1284 */ 1285 static void mmc_detect(struct mmc_host *host) 1286 { 1287 int err; 1288 1289 BUG_ON(!host); 1290 BUG_ON(!host->card); 1291 1292 mmc_claim_host(host); 1293 1294 /* 1295 * Just check if our card has been removed. 1296 */ 1297 err = _mmc_detect_card_removed(host); 1298 1299 mmc_release_host(host); 1300 1301 if (err) { 1302 mmc_remove(host); 1303 1304 mmc_claim_host(host); 1305 mmc_detach_bus(host); 1306 mmc_power_off(host); 1307 mmc_release_host(host); 1308 } 1309 } 1310 1311 /* 1312 * Suspend callback from host. 1313 */ 1314 static int mmc_suspend(struct mmc_host *host) 1315 { 1316 int err = 0; 1317 1318 BUG_ON(!host); 1319 BUG_ON(!host->card); 1320 1321 mmc_claim_host(host); 1322 if (mmc_card_can_sleep(host)) { 1323 err = mmc_card_sleep(host); 1324 if (!err) 1325 mmc_card_set_sleep(host->card); 1326 } else if (!mmc_host_is_spi(host)) 1327 mmc_deselect_cards(host); 1328 host->card->state &= ~(MMC_STATE_HIGHSPEED | MMC_STATE_HIGHSPEED_200); 1329 mmc_release_host(host); 1330 1331 return err; 1332 } 1333 1334 /* 1335 * Resume callback from host. 1336 * 1337 * This function tries to determine if the same card is still present 1338 * and, if so, restore all state to it. 1339 */ 1340 static int mmc_resume(struct mmc_host *host) 1341 { 1342 int err; 1343 1344 BUG_ON(!host); 1345 BUG_ON(!host->card); 1346 1347 mmc_claim_host(host); 1348 if (mmc_card_is_sleep(host->card)) { 1349 err = mmc_card_awake(host); 1350 mmc_card_clr_sleep(host->card); 1351 } else 1352 err = mmc_init_card(host, host->ocr, host->card); 1353 mmc_release_host(host); 1354 1355 return err; 1356 } 1357 1358 static int mmc_power_restore(struct mmc_host *host) 1359 { 1360 int ret; 1361 1362 host->card->state &= ~(MMC_STATE_HIGHSPEED | MMC_STATE_HIGHSPEED_200); 1363 mmc_card_clr_sleep(host->card); 1364 mmc_claim_host(host); 1365 ret = mmc_init_card(host, host->ocr, host->card); 1366 mmc_release_host(host); 1367 1368 return ret; 1369 } 1370 1371 static int mmc_sleep(struct mmc_host *host) 1372 { 1373 struct mmc_card *card = host->card; 1374 int err = -ENOSYS; 1375 1376 if (card && card->ext_csd.rev >= 3) { 1377 err = mmc_card_sleepawake(host, 1); 1378 if (err < 0) 1379 pr_debug("%s: Error %d while putting card into sleep", 1380 mmc_hostname(host), err); 1381 } 1382 1383 return err; 1384 } 1385 1386 static int mmc_awake(struct mmc_host *host) 1387 { 1388 struct mmc_card *card = host->card; 1389 int err = -ENOSYS; 1390 1391 if (card && card->ext_csd.rev >= 3) { 1392 err = mmc_card_sleepawake(host, 0); 1393 if (err < 0) 1394 pr_debug("%s: Error %d while awaking sleeping card", 1395 mmc_hostname(host), err); 1396 } 1397 1398 return err; 1399 } 1400 1401 static const struct mmc_bus_ops mmc_ops = { 1402 .awake = mmc_awake, 1403 .sleep = mmc_sleep, 1404 .remove = mmc_remove, 1405 .detect = mmc_detect, 1406 .suspend = NULL, 1407 .resume = NULL, 1408 .power_restore = mmc_power_restore, 1409 .alive = mmc_alive, 1410 }; 1411 1412 static const struct mmc_bus_ops mmc_ops_unsafe = { 1413 .awake = mmc_awake, 1414 .sleep = mmc_sleep, 1415 .remove = mmc_remove, 1416 .detect = mmc_detect, 1417 .suspend = mmc_suspend, 1418 .resume = mmc_resume, 1419 .power_restore = mmc_power_restore, 1420 .alive = mmc_alive, 1421 }; 1422 1423 static void mmc_attach_bus_ops(struct mmc_host *host) 1424 { 1425 const struct mmc_bus_ops *bus_ops; 1426 1427 if (!mmc_card_is_removable(host)) 1428 bus_ops = &mmc_ops_unsafe; 1429 else 1430 bus_ops = &mmc_ops; 1431 mmc_attach_bus(host, bus_ops); 1432 } 1433 1434 /* 1435 * Starting point for MMC card init. 1436 */ 1437 int mmc_attach_mmc(struct mmc_host *host) 1438 { 1439 int err; 1440 u32 ocr; 1441 1442 BUG_ON(!host); 1443 WARN_ON(!host->claimed); 1444 1445 /* Set correct bus mode for MMC before attempting attach */ 1446 if (!mmc_host_is_spi(host)) 1447 mmc_set_bus_mode(host, MMC_BUSMODE_OPENDRAIN); 1448 1449 err = mmc_send_op_cond(host, 0, &ocr); 1450 if (err) 1451 return err; 1452 1453 mmc_attach_bus_ops(host); 1454 if (host->ocr_avail_mmc) 1455 host->ocr_avail = host->ocr_avail_mmc; 1456 1457 /* 1458 * We need to get OCR a different way for SPI. 1459 */ 1460 if (mmc_host_is_spi(host)) { 1461 err = mmc_spi_read_ocr(host, 1, &ocr); 1462 if (err) 1463 goto err; 1464 } 1465 1466 /* 1467 * Sanity check the voltages that the card claims to 1468 * support. 1469 */ 1470 if (ocr & 0x7F) { 1471 pr_warning("%s: card claims to support voltages " 1472 "below the defined range. These will be ignored.\n", 1473 mmc_hostname(host)); 1474 ocr &= ~0x7F; 1475 } 1476 1477 host->ocr = mmc_select_voltage(host, ocr); 1478 1479 /* 1480 * Can we support the voltage of the card? 1481 */ 1482 if (!host->ocr) { 1483 err = -EINVAL; 1484 goto err; 1485 } 1486 1487 /* 1488 * Detect and init the card. 1489 */ 1490 err = mmc_init_card(host, host->ocr, NULL); 1491 if (err) 1492 goto err; 1493 1494 mmc_release_host(host); 1495 err = mmc_add_card(host->card); 1496 mmc_claim_host(host); 1497 if (err) 1498 goto remove_card; 1499 1500 return 0; 1501 1502 remove_card: 1503 mmc_release_host(host); 1504 mmc_remove_card(host->card); 1505 mmc_claim_host(host); 1506 host->card = NULL; 1507 err: 1508 mmc_detach_bus(host); 1509 1510 pr_err("%s: error %d whilst initialising MMC card\n", 1511 mmc_hostname(host), err); 1512 1513 return err; 1514 } 1515