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 if (ext_csd[EXT_CSD_DATA_SECTOR_SIZE] == 1) 524 card->ext_csd.data_sector_size = 4096; 525 else 526 card->ext_csd.data_sector_size = 512; 527 528 if ((ext_csd[EXT_CSD_DATA_TAG_SUPPORT] & 1) && 529 (ext_csd[EXT_CSD_TAG_UNIT_SIZE] <= 8)) { 530 card->ext_csd.data_tag_unit_size = 531 ((unsigned int) 1 << ext_csd[EXT_CSD_TAG_UNIT_SIZE]) * 532 (card->ext_csd.data_sector_size); 533 } else { 534 card->ext_csd.data_tag_unit_size = 0; 535 } 536 } 537 538 out: 539 return err; 540 } 541 542 static inline void mmc_free_ext_csd(u8 *ext_csd) 543 { 544 kfree(ext_csd); 545 } 546 547 548 static int mmc_compare_ext_csds(struct mmc_card *card, unsigned bus_width) 549 { 550 u8 *bw_ext_csd; 551 int err; 552 553 if (bus_width == MMC_BUS_WIDTH_1) 554 return 0; 555 556 err = mmc_get_ext_csd(card, &bw_ext_csd); 557 558 if (err || bw_ext_csd == NULL) { 559 if (bus_width != MMC_BUS_WIDTH_1) 560 err = -EINVAL; 561 goto out; 562 } 563 564 if (bus_width == MMC_BUS_WIDTH_1) 565 goto out; 566 567 /* only compare read only fields */ 568 err = !((card->ext_csd.raw_partition_support == 569 bw_ext_csd[EXT_CSD_PARTITION_SUPPORT]) && 570 (card->ext_csd.raw_erased_mem_count == 571 bw_ext_csd[EXT_CSD_ERASED_MEM_CONT]) && 572 (card->ext_csd.rev == 573 bw_ext_csd[EXT_CSD_REV]) && 574 (card->ext_csd.raw_ext_csd_structure == 575 bw_ext_csd[EXT_CSD_STRUCTURE]) && 576 (card->ext_csd.raw_card_type == 577 bw_ext_csd[EXT_CSD_CARD_TYPE]) && 578 (card->ext_csd.raw_s_a_timeout == 579 bw_ext_csd[EXT_CSD_S_A_TIMEOUT]) && 580 (card->ext_csd.raw_hc_erase_gap_size == 581 bw_ext_csd[EXT_CSD_HC_WP_GRP_SIZE]) && 582 (card->ext_csd.raw_erase_timeout_mult == 583 bw_ext_csd[EXT_CSD_ERASE_TIMEOUT_MULT]) && 584 (card->ext_csd.raw_hc_erase_grp_size == 585 bw_ext_csd[EXT_CSD_HC_ERASE_GRP_SIZE]) && 586 (card->ext_csd.raw_sec_trim_mult == 587 bw_ext_csd[EXT_CSD_SEC_TRIM_MULT]) && 588 (card->ext_csd.raw_sec_erase_mult == 589 bw_ext_csd[EXT_CSD_SEC_ERASE_MULT]) && 590 (card->ext_csd.raw_sec_feature_support == 591 bw_ext_csd[EXT_CSD_SEC_FEATURE_SUPPORT]) && 592 (card->ext_csd.raw_trim_mult == 593 bw_ext_csd[EXT_CSD_TRIM_MULT]) && 594 (card->ext_csd.raw_sectors[0] == 595 bw_ext_csd[EXT_CSD_SEC_CNT + 0]) && 596 (card->ext_csd.raw_sectors[1] == 597 bw_ext_csd[EXT_CSD_SEC_CNT + 1]) && 598 (card->ext_csd.raw_sectors[2] == 599 bw_ext_csd[EXT_CSD_SEC_CNT + 2]) && 600 (card->ext_csd.raw_sectors[3] == 601 bw_ext_csd[EXT_CSD_SEC_CNT + 3])); 602 if (err) 603 err = -EINVAL; 604 605 out: 606 mmc_free_ext_csd(bw_ext_csd); 607 return err; 608 } 609 610 MMC_DEV_ATTR(cid, "%08x%08x%08x%08x\n", card->raw_cid[0], card->raw_cid[1], 611 card->raw_cid[2], card->raw_cid[3]); 612 MMC_DEV_ATTR(csd, "%08x%08x%08x%08x\n", card->raw_csd[0], card->raw_csd[1], 613 card->raw_csd[2], card->raw_csd[3]); 614 MMC_DEV_ATTR(date, "%02d/%04d\n", card->cid.month, card->cid.year); 615 MMC_DEV_ATTR(erase_size, "%u\n", card->erase_size << 9); 616 MMC_DEV_ATTR(preferred_erase_size, "%u\n", card->pref_erase << 9); 617 MMC_DEV_ATTR(fwrev, "0x%x\n", card->cid.fwrev); 618 MMC_DEV_ATTR(hwrev, "0x%x\n", card->cid.hwrev); 619 MMC_DEV_ATTR(manfid, "0x%06x\n", card->cid.manfid); 620 MMC_DEV_ATTR(name, "%s\n", card->cid.prod_name); 621 MMC_DEV_ATTR(oemid, "0x%04x\n", card->cid.oemid); 622 MMC_DEV_ATTR(serial, "0x%08x\n", card->cid.serial); 623 MMC_DEV_ATTR(enhanced_area_offset, "%llu\n", 624 card->ext_csd.enhanced_area_offset); 625 MMC_DEV_ATTR(enhanced_area_size, "%u\n", card->ext_csd.enhanced_area_size); 626 627 static struct attribute *mmc_std_attrs[] = { 628 &dev_attr_cid.attr, 629 &dev_attr_csd.attr, 630 &dev_attr_date.attr, 631 &dev_attr_erase_size.attr, 632 &dev_attr_preferred_erase_size.attr, 633 &dev_attr_fwrev.attr, 634 &dev_attr_hwrev.attr, 635 &dev_attr_manfid.attr, 636 &dev_attr_name.attr, 637 &dev_attr_oemid.attr, 638 &dev_attr_serial.attr, 639 &dev_attr_enhanced_area_offset.attr, 640 &dev_attr_enhanced_area_size.attr, 641 NULL, 642 }; 643 644 static struct attribute_group mmc_std_attr_group = { 645 .attrs = mmc_std_attrs, 646 }; 647 648 static const struct attribute_group *mmc_attr_groups[] = { 649 &mmc_std_attr_group, 650 NULL, 651 }; 652 653 static struct device_type mmc_type = { 654 .groups = mmc_attr_groups, 655 }; 656 657 /* 658 * Select the PowerClass for the current bus width 659 * If power class is defined for 4/8 bit bus in the 660 * extended CSD register, select it by executing the 661 * mmc_switch command. 662 */ 663 static int mmc_select_powerclass(struct mmc_card *card, 664 unsigned int bus_width, u8 *ext_csd) 665 { 666 int err = 0; 667 unsigned int pwrclass_val; 668 unsigned int index = 0; 669 struct mmc_host *host; 670 671 BUG_ON(!card); 672 673 host = card->host; 674 BUG_ON(!host); 675 676 if (ext_csd == NULL) 677 return 0; 678 679 /* Power class selection is supported for versions >= 4.0 */ 680 if (card->csd.mmca_vsn < CSD_SPEC_VER_4) 681 return 0; 682 683 /* Power class values are defined only for 4/8 bit bus */ 684 if (bus_width == EXT_CSD_BUS_WIDTH_1) 685 return 0; 686 687 switch (1 << host->ios.vdd) { 688 case MMC_VDD_165_195: 689 if (host->ios.clock <= 26000000) 690 index = EXT_CSD_PWR_CL_26_195; 691 else if (host->ios.clock <= 52000000) 692 index = (bus_width <= EXT_CSD_BUS_WIDTH_8) ? 693 EXT_CSD_PWR_CL_52_195 : 694 EXT_CSD_PWR_CL_DDR_52_195; 695 else if (host->ios.clock <= 200000000) 696 index = EXT_CSD_PWR_CL_200_195; 697 break; 698 case MMC_VDD_27_28: 699 case MMC_VDD_28_29: 700 case MMC_VDD_29_30: 701 case MMC_VDD_30_31: 702 case MMC_VDD_31_32: 703 case MMC_VDD_32_33: 704 case MMC_VDD_33_34: 705 case MMC_VDD_34_35: 706 case MMC_VDD_35_36: 707 if (host->ios.clock <= 26000000) 708 index = EXT_CSD_PWR_CL_26_360; 709 else if (host->ios.clock <= 52000000) 710 index = (bus_width <= EXT_CSD_BUS_WIDTH_8) ? 711 EXT_CSD_PWR_CL_52_360 : 712 EXT_CSD_PWR_CL_DDR_52_360; 713 else if (host->ios.clock <= 200000000) 714 index = EXT_CSD_PWR_CL_200_360; 715 break; 716 default: 717 pr_warning("%s: Voltage range not supported " 718 "for power class.\n", mmc_hostname(host)); 719 return -EINVAL; 720 } 721 722 pwrclass_val = ext_csd[index]; 723 724 if (bus_width & (EXT_CSD_BUS_WIDTH_8 | EXT_CSD_DDR_BUS_WIDTH_8)) 725 pwrclass_val = (pwrclass_val & EXT_CSD_PWR_CL_8BIT_MASK) >> 726 EXT_CSD_PWR_CL_8BIT_SHIFT; 727 else 728 pwrclass_val = (pwrclass_val & EXT_CSD_PWR_CL_4BIT_MASK) >> 729 EXT_CSD_PWR_CL_4BIT_SHIFT; 730 731 /* If the power class is different from the default value */ 732 if (pwrclass_val > 0) { 733 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL, 734 EXT_CSD_POWER_CLASS, 735 pwrclass_val, 736 card->ext_csd.generic_cmd6_time); 737 } 738 739 return err; 740 } 741 742 /* 743 * Selects the desired buswidth and switch to the HS200 mode 744 * if bus width set without error 745 */ 746 static int mmc_select_hs200(struct mmc_card *card) 747 { 748 int idx, err = 0; 749 struct mmc_host *host; 750 static unsigned ext_csd_bits[] = { 751 EXT_CSD_BUS_WIDTH_4, 752 EXT_CSD_BUS_WIDTH_8, 753 }; 754 static unsigned bus_widths[] = { 755 MMC_BUS_WIDTH_4, 756 MMC_BUS_WIDTH_8, 757 }; 758 759 BUG_ON(!card); 760 761 host = card->host; 762 763 if (card->ext_csd.card_type & EXT_CSD_CARD_TYPE_SDR_1_2V && 764 host->caps2 & MMC_CAP2_HS200_1_2V_SDR) 765 if (mmc_set_signal_voltage(host, MMC_SIGNAL_VOLTAGE_120, 0)) 766 err = mmc_set_signal_voltage(host, 767 MMC_SIGNAL_VOLTAGE_180, 0); 768 769 /* If fails try again during next card power cycle */ 770 if (err) 771 goto err; 772 773 idx = (host->caps & MMC_CAP_8_BIT_DATA) ? 1 : 0; 774 775 /* 776 * Unlike SD, MMC cards dont have a configuration register to notify 777 * supported bus width. So bus test command should be run to identify 778 * the supported bus width or compare the ext csd values of current 779 * bus width and ext csd values of 1 bit mode read earlier. 780 */ 781 for (; idx >= 0; idx--) { 782 783 /* 784 * Host is capable of 8bit transfer, then switch 785 * the device to work in 8bit transfer mode. If the 786 * mmc switch command returns error then switch to 787 * 4bit transfer mode. On success set the corresponding 788 * bus width on the host. 789 */ 790 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL, 791 EXT_CSD_BUS_WIDTH, 792 ext_csd_bits[idx], 793 card->ext_csd.generic_cmd6_time); 794 if (err) 795 continue; 796 797 mmc_set_bus_width(card->host, bus_widths[idx]); 798 799 if (!(host->caps & MMC_CAP_BUS_WIDTH_TEST)) 800 err = mmc_compare_ext_csds(card, bus_widths[idx]); 801 else 802 err = mmc_bus_test(card, bus_widths[idx]); 803 if (!err) 804 break; 805 } 806 807 /* switch to HS200 mode if bus width set successfully */ 808 if (!err) 809 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL, 810 EXT_CSD_HS_TIMING, 2, 0); 811 err: 812 return err; 813 } 814 815 /* 816 * Handle the detection and initialisation of a card. 817 * 818 * In the case of a resume, "oldcard" will contain the card 819 * we're trying to reinitialise. 820 */ 821 static int mmc_init_card(struct mmc_host *host, u32 ocr, 822 struct mmc_card *oldcard) 823 { 824 struct mmc_card *card; 825 int err, ddr = 0; 826 u32 cid[4]; 827 unsigned int max_dtr; 828 u32 rocr; 829 u8 *ext_csd = NULL; 830 831 BUG_ON(!host); 832 WARN_ON(!host->claimed); 833 834 /* Set correct bus mode for MMC before attempting init */ 835 if (!mmc_host_is_spi(host)) 836 mmc_set_bus_mode(host, MMC_BUSMODE_OPENDRAIN); 837 838 /* Initialization should be done at 3.3 V I/O voltage. */ 839 mmc_set_signal_voltage(host, MMC_SIGNAL_VOLTAGE_330, 0); 840 841 /* 842 * Since we're changing the OCR value, we seem to 843 * need to tell some cards to go back to the idle 844 * state. We wait 1ms to give cards time to 845 * respond. 846 * mmc_go_idle is needed for eMMC that are asleep 847 */ 848 mmc_go_idle(host); 849 850 /* The extra bit indicates that we support high capacity */ 851 err = mmc_send_op_cond(host, ocr | (1 << 30), &rocr); 852 if (err) 853 goto err; 854 855 /* 856 * For SPI, enable CRC as appropriate. 857 */ 858 if (mmc_host_is_spi(host)) { 859 err = mmc_spi_set_crc(host, use_spi_crc); 860 if (err) 861 goto err; 862 } 863 864 /* 865 * Fetch CID from card. 866 */ 867 if (mmc_host_is_spi(host)) 868 err = mmc_send_cid(host, cid); 869 else 870 err = mmc_all_send_cid(host, cid); 871 if (err) 872 goto err; 873 874 if (oldcard) { 875 if (memcmp(cid, oldcard->raw_cid, sizeof(cid)) != 0) { 876 err = -ENOENT; 877 goto err; 878 } 879 880 card = oldcard; 881 } else { 882 /* 883 * Allocate card structure. 884 */ 885 card = mmc_alloc_card(host, &mmc_type); 886 if (IS_ERR(card)) { 887 err = PTR_ERR(card); 888 goto err; 889 } 890 891 card->type = MMC_TYPE_MMC; 892 card->rca = 1; 893 memcpy(card->raw_cid, cid, sizeof(card->raw_cid)); 894 } 895 896 /* 897 * For native busses: set card RCA and quit open drain mode. 898 */ 899 if (!mmc_host_is_spi(host)) { 900 err = mmc_set_relative_addr(card); 901 if (err) 902 goto free_card; 903 904 mmc_set_bus_mode(host, MMC_BUSMODE_PUSHPULL); 905 } 906 907 if (!oldcard) { 908 /* 909 * Fetch CSD from card. 910 */ 911 err = mmc_send_csd(card, card->raw_csd); 912 if (err) 913 goto free_card; 914 915 err = mmc_decode_csd(card); 916 if (err) 917 goto free_card; 918 err = mmc_decode_cid(card); 919 if (err) 920 goto free_card; 921 } 922 923 /* 924 * Select card, as all following commands rely on that. 925 */ 926 if (!mmc_host_is_spi(host)) { 927 err = mmc_select_card(card); 928 if (err) 929 goto free_card; 930 } 931 932 if (!oldcard) { 933 /* 934 * Fetch and process extended CSD. 935 */ 936 937 err = mmc_get_ext_csd(card, &ext_csd); 938 if (err) 939 goto free_card; 940 err = mmc_read_ext_csd(card, ext_csd); 941 if (err) 942 goto free_card; 943 944 /* If doing byte addressing, check if required to do sector 945 * addressing. Handle the case of <2GB cards needing sector 946 * addressing. See section 8.1 JEDEC Standard JED84-A441; 947 * ocr register has bit 30 set for sector addressing. 948 */ 949 if (!(mmc_card_blockaddr(card)) && (rocr & (1<<30))) 950 mmc_card_set_blockaddr(card); 951 952 /* Erase size depends on CSD and Extended CSD */ 953 mmc_set_erase_size(card); 954 } 955 956 /* 957 * If enhanced_area_en is TRUE, host needs to enable ERASE_GRP_DEF 958 * bit. This bit will be lost every time after a reset or power off. 959 */ 960 if (card->ext_csd.enhanced_area_en || 961 (card->ext_csd.rev >= 3 && (host->caps2 & MMC_CAP2_HC_ERASE_SZ))) { 962 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL, 963 EXT_CSD_ERASE_GROUP_DEF, 1, 964 card->ext_csd.generic_cmd6_time); 965 966 if (err && err != -EBADMSG) 967 goto free_card; 968 969 if (err) { 970 err = 0; 971 /* 972 * Just disable enhanced area off & sz 973 * will try to enable ERASE_GROUP_DEF 974 * during next time reinit 975 */ 976 card->ext_csd.enhanced_area_offset = -EINVAL; 977 card->ext_csd.enhanced_area_size = -EINVAL; 978 } else { 979 card->ext_csd.erase_group_def = 1; 980 /* 981 * enable ERASE_GRP_DEF successfully. 982 * This will affect the erase size, so 983 * here need to reset erase size 984 */ 985 mmc_set_erase_size(card); 986 } 987 } 988 989 /* 990 * Ensure eMMC user default partition is enabled 991 */ 992 if (card->ext_csd.part_config & EXT_CSD_PART_CONFIG_ACC_MASK) { 993 card->ext_csd.part_config &= ~EXT_CSD_PART_CONFIG_ACC_MASK; 994 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL, EXT_CSD_PART_CONFIG, 995 card->ext_csd.part_config, 996 card->ext_csd.part_time); 997 if (err && err != -EBADMSG) 998 goto free_card; 999 } 1000 1001 /* 1002 * If the host supports the power_off_notify capability then 1003 * set the notification byte in the ext_csd register of device 1004 */ 1005 if ((host->caps2 & MMC_CAP2_POWEROFF_NOTIFY) && 1006 (card->ext_csd.rev >= 6)) { 1007 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL, 1008 EXT_CSD_POWER_OFF_NOTIFICATION, 1009 EXT_CSD_POWER_ON, 1010 card->ext_csd.generic_cmd6_time); 1011 if (err && err != -EBADMSG) 1012 goto free_card; 1013 1014 /* 1015 * The err can be -EBADMSG or 0, 1016 * so check for success and update the flag 1017 */ 1018 if (!err) 1019 card->poweroff_notify_state = MMC_POWERED_ON; 1020 } 1021 1022 /* 1023 * Activate high speed (if supported) 1024 */ 1025 if (card->ext_csd.hs_max_dtr != 0) { 1026 err = 0; 1027 if (card->ext_csd.hs_max_dtr > 52000000 && 1028 host->caps2 & MMC_CAP2_HS200) 1029 err = mmc_select_hs200(card); 1030 else if (host->caps & MMC_CAP_MMC_HIGHSPEED) 1031 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL, 1032 EXT_CSD_HS_TIMING, 1, 1033 card->ext_csd.generic_cmd6_time); 1034 1035 if (err && err != -EBADMSG) 1036 goto free_card; 1037 1038 if (err) { 1039 pr_warning("%s: switch to highspeed failed\n", 1040 mmc_hostname(card->host)); 1041 err = 0; 1042 } else { 1043 if (card->ext_csd.hs_max_dtr > 52000000 && 1044 host->caps2 & MMC_CAP2_HS200) { 1045 mmc_card_set_hs200(card); 1046 mmc_set_timing(card->host, 1047 MMC_TIMING_MMC_HS200); 1048 } else { 1049 mmc_card_set_highspeed(card); 1050 mmc_set_timing(card->host, MMC_TIMING_MMC_HS); 1051 } 1052 } 1053 } 1054 1055 /* 1056 * Compute bus speed. 1057 */ 1058 max_dtr = (unsigned int)-1; 1059 1060 if (mmc_card_highspeed(card) || mmc_card_hs200(card)) { 1061 if (max_dtr > card->ext_csd.hs_max_dtr) 1062 max_dtr = card->ext_csd.hs_max_dtr; 1063 } else if (max_dtr > card->csd.max_dtr) { 1064 max_dtr = card->csd.max_dtr; 1065 } 1066 1067 mmc_set_clock(host, max_dtr); 1068 1069 /* 1070 * Indicate DDR mode (if supported). 1071 */ 1072 if (mmc_card_highspeed(card)) { 1073 if ((card->ext_csd.card_type & EXT_CSD_CARD_TYPE_DDR_1_8V) 1074 && ((host->caps & (MMC_CAP_1_8V_DDR | 1075 MMC_CAP_UHS_DDR50)) 1076 == (MMC_CAP_1_8V_DDR | MMC_CAP_UHS_DDR50))) 1077 ddr = MMC_1_8V_DDR_MODE; 1078 else if ((card->ext_csd.card_type & EXT_CSD_CARD_TYPE_DDR_1_2V) 1079 && ((host->caps & (MMC_CAP_1_2V_DDR | 1080 MMC_CAP_UHS_DDR50)) 1081 == (MMC_CAP_1_2V_DDR | MMC_CAP_UHS_DDR50))) 1082 ddr = MMC_1_2V_DDR_MODE; 1083 } 1084 1085 /* 1086 * Indicate HS200 SDR mode (if supported). 1087 */ 1088 if (mmc_card_hs200(card)) { 1089 u32 ext_csd_bits; 1090 u32 bus_width = card->host->ios.bus_width; 1091 1092 /* 1093 * For devices supporting HS200 mode, the bus width has 1094 * to be set before executing the tuning function. If 1095 * set before tuning, then device will respond with CRC 1096 * errors for responses on CMD line. So for HS200 the 1097 * sequence will be 1098 * 1. set bus width 4bit / 8 bit (1 bit not supported) 1099 * 2. switch to HS200 mode 1100 * 3. set the clock to > 52Mhz <=200MHz and 1101 * 4. execute tuning for HS200 1102 */ 1103 if ((host->caps2 & MMC_CAP2_HS200) && 1104 card->host->ops->execute_tuning) { 1105 mmc_host_clk_hold(card->host); 1106 err = card->host->ops->execute_tuning(card->host, 1107 MMC_SEND_TUNING_BLOCK_HS200); 1108 mmc_host_clk_release(card->host); 1109 } 1110 if (err) { 1111 pr_warning("%s: tuning execution failed\n", 1112 mmc_hostname(card->host)); 1113 goto err; 1114 } 1115 1116 ext_csd_bits = (bus_width == MMC_BUS_WIDTH_8) ? 1117 EXT_CSD_BUS_WIDTH_8 : EXT_CSD_BUS_WIDTH_4; 1118 err = mmc_select_powerclass(card, ext_csd_bits, ext_csd); 1119 if (err) 1120 pr_warning("%s: power class selection to bus width %d" 1121 " failed\n", mmc_hostname(card->host), 1122 1 << bus_width); 1123 } 1124 1125 /* 1126 * Activate wide bus and DDR (if supported). 1127 */ 1128 if (!mmc_card_hs200(card) && 1129 (card->csd.mmca_vsn >= CSD_SPEC_VER_4) && 1130 (host->caps & (MMC_CAP_4_BIT_DATA | MMC_CAP_8_BIT_DATA))) { 1131 static unsigned ext_csd_bits[][2] = { 1132 { EXT_CSD_BUS_WIDTH_8, EXT_CSD_DDR_BUS_WIDTH_8 }, 1133 { EXT_CSD_BUS_WIDTH_4, EXT_CSD_DDR_BUS_WIDTH_4 }, 1134 { EXT_CSD_BUS_WIDTH_1, EXT_CSD_BUS_WIDTH_1 }, 1135 }; 1136 static unsigned bus_widths[] = { 1137 MMC_BUS_WIDTH_8, 1138 MMC_BUS_WIDTH_4, 1139 MMC_BUS_WIDTH_1 1140 }; 1141 unsigned idx, bus_width = 0; 1142 1143 if (host->caps & MMC_CAP_8_BIT_DATA) 1144 idx = 0; 1145 else 1146 idx = 1; 1147 for (; idx < ARRAY_SIZE(bus_widths); idx++) { 1148 bus_width = bus_widths[idx]; 1149 if (bus_width == MMC_BUS_WIDTH_1) 1150 ddr = 0; /* no DDR for 1-bit width */ 1151 err = mmc_select_powerclass(card, ext_csd_bits[idx][0], 1152 ext_csd); 1153 if (err) 1154 pr_warning("%s: power class selection to " 1155 "bus width %d failed\n", 1156 mmc_hostname(card->host), 1157 1 << bus_width); 1158 1159 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL, 1160 EXT_CSD_BUS_WIDTH, 1161 ext_csd_bits[idx][0], 1162 card->ext_csd.generic_cmd6_time); 1163 if (!err) { 1164 mmc_set_bus_width(card->host, bus_width); 1165 1166 /* 1167 * If controller can't handle bus width test, 1168 * compare ext_csd previously read in 1 bit mode 1169 * against ext_csd at new bus width 1170 */ 1171 if (!(host->caps & MMC_CAP_BUS_WIDTH_TEST)) 1172 err = mmc_compare_ext_csds(card, 1173 bus_width); 1174 else 1175 err = mmc_bus_test(card, bus_width); 1176 if (!err) 1177 break; 1178 } 1179 } 1180 1181 if (!err && ddr) { 1182 err = mmc_select_powerclass(card, ext_csd_bits[idx][1], 1183 ext_csd); 1184 if (err) 1185 pr_warning("%s: power class selection to " 1186 "bus width %d ddr %d failed\n", 1187 mmc_hostname(card->host), 1188 1 << bus_width, ddr); 1189 1190 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL, 1191 EXT_CSD_BUS_WIDTH, 1192 ext_csd_bits[idx][1], 1193 card->ext_csd.generic_cmd6_time); 1194 } 1195 if (err) { 1196 pr_warning("%s: switch to bus width %d ddr %d " 1197 "failed\n", mmc_hostname(card->host), 1198 1 << bus_width, ddr); 1199 goto free_card; 1200 } else if (ddr) { 1201 /* 1202 * eMMC cards can support 3.3V to 1.2V i/o (vccq) 1203 * signaling. 1204 * 1205 * EXT_CSD_CARD_TYPE_DDR_1_8V means 3.3V or 1.8V vccq. 1206 * 1207 * 1.8V vccq at 3.3V core voltage (vcc) is not required 1208 * in the JEDEC spec for DDR. 1209 * 1210 * Do not force change in vccq since we are obviously 1211 * working and no change to vccq is needed. 1212 * 1213 * WARNING: eMMC rules are NOT the same as SD DDR 1214 */ 1215 if (ddr == MMC_1_2V_DDR_MODE) { 1216 err = mmc_set_signal_voltage(host, 1217 MMC_SIGNAL_VOLTAGE_120, 0); 1218 if (err) 1219 goto err; 1220 } 1221 mmc_card_set_ddr_mode(card); 1222 mmc_set_timing(card->host, MMC_TIMING_UHS_DDR50); 1223 mmc_set_bus_width(card->host, bus_width); 1224 } 1225 } 1226 1227 /* 1228 * Enable HPI feature (if supported) 1229 */ 1230 if (card->ext_csd.hpi) { 1231 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL, 1232 EXT_CSD_HPI_MGMT, 1, 1233 card->ext_csd.generic_cmd6_time); 1234 if (err && err != -EBADMSG) 1235 goto free_card; 1236 if (err) { 1237 pr_warning("%s: Enabling HPI failed\n", 1238 mmc_hostname(card->host)); 1239 err = 0; 1240 } else 1241 card->ext_csd.hpi_en = 1; 1242 } 1243 1244 /* 1245 * If cache size is higher than 0, this indicates 1246 * the existence of cache and it can be turned on. 1247 */ 1248 if ((host->caps2 & MMC_CAP2_CACHE_CTRL) && 1249 card->ext_csd.cache_size > 0) { 1250 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL, 1251 EXT_CSD_CACHE_CTRL, 1, 1252 card->ext_csd.generic_cmd6_time); 1253 if (err && err != -EBADMSG) 1254 goto free_card; 1255 1256 /* 1257 * Only if no error, cache is turned on successfully. 1258 */ 1259 if (err) { 1260 pr_warning("%s: Cache is supported, " 1261 "but failed to turn on (%d)\n", 1262 mmc_hostname(card->host), err); 1263 card->ext_csd.cache_ctrl = 0; 1264 err = 0; 1265 } else { 1266 card->ext_csd.cache_ctrl = 1; 1267 } 1268 } 1269 1270 if (!oldcard) 1271 host->card = card; 1272 1273 mmc_free_ext_csd(ext_csd); 1274 return 0; 1275 1276 free_card: 1277 if (!oldcard) 1278 mmc_remove_card(card); 1279 err: 1280 mmc_free_ext_csd(ext_csd); 1281 1282 return err; 1283 } 1284 1285 /* 1286 * Host is being removed. Free up the current card. 1287 */ 1288 static void mmc_remove(struct mmc_host *host) 1289 { 1290 BUG_ON(!host); 1291 BUG_ON(!host->card); 1292 1293 mmc_remove_card(host->card); 1294 host->card = NULL; 1295 } 1296 1297 /* 1298 * Card detection - card is alive. 1299 */ 1300 static int mmc_alive(struct mmc_host *host) 1301 { 1302 return mmc_send_status(host->card, NULL); 1303 } 1304 1305 /* 1306 * Card detection callback from host. 1307 */ 1308 static void mmc_detect(struct mmc_host *host) 1309 { 1310 int err; 1311 1312 BUG_ON(!host); 1313 BUG_ON(!host->card); 1314 1315 mmc_claim_host(host); 1316 1317 /* 1318 * Just check if our card has been removed. 1319 */ 1320 err = _mmc_detect_card_removed(host); 1321 1322 mmc_release_host(host); 1323 1324 if (err) { 1325 mmc_remove(host); 1326 1327 mmc_claim_host(host); 1328 mmc_detach_bus(host); 1329 mmc_power_off(host); 1330 mmc_release_host(host); 1331 } 1332 } 1333 1334 /* 1335 * Suspend callback from host. 1336 */ 1337 static int mmc_suspend(struct mmc_host *host) 1338 { 1339 int err = 0; 1340 1341 BUG_ON(!host); 1342 BUG_ON(!host->card); 1343 1344 mmc_claim_host(host); 1345 if (mmc_card_can_sleep(host)) { 1346 err = mmc_card_sleep(host); 1347 if (!err) 1348 mmc_card_set_sleep(host->card); 1349 } else if (!mmc_host_is_spi(host)) 1350 mmc_deselect_cards(host); 1351 host->card->state &= ~(MMC_STATE_HIGHSPEED | MMC_STATE_HIGHSPEED_200); 1352 mmc_release_host(host); 1353 1354 return err; 1355 } 1356 1357 /* 1358 * Resume callback from host. 1359 * 1360 * This function tries to determine if the same card is still present 1361 * and, if so, restore all state to it. 1362 */ 1363 static int mmc_resume(struct mmc_host *host) 1364 { 1365 int err; 1366 1367 BUG_ON(!host); 1368 BUG_ON(!host->card); 1369 1370 mmc_claim_host(host); 1371 if (mmc_card_is_sleep(host->card)) { 1372 err = mmc_card_awake(host); 1373 mmc_card_clr_sleep(host->card); 1374 } else 1375 err = mmc_init_card(host, host->ocr, host->card); 1376 mmc_release_host(host); 1377 1378 return err; 1379 } 1380 1381 static int mmc_power_restore(struct mmc_host *host) 1382 { 1383 int ret; 1384 1385 host->card->state &= ~(MMC_STATE_HIGHSPEED | MMC_STATE_HIGHSPEED_200); 1386 mmc_card_clr_sleep(host->card); 1387 mmc_claim_host(host); 1388 ret = mmc_init_card(host, host->ocr, host->card); 1389 mmc_release_host(host); 1390 1391 return ret; 1392 } 1393 1394 static int mmc_sleep(struct mmc_host *host) 1395 { 1396 struct mmc_card *card = host->card; 1397 int err = -ENOSYS; 1398 1399 if (card && card->ext_csd.rev >= 3) { 1400 err = mmc_card_sleepawake(host, 1); 1401 if (err < 0) 1402 pr_debug("%s: Error %d while putting card into sleep", 1403 mmc_hostname(host), err); 1404 } 1405 1406 return err; 1407 } 1408 1409 static int mmc_awake(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, 0); 1416 if (err < 0) 1417 pr_debug("%s: Error %d while awaking sleeping card", 1418 mmc_hostname(host), err); 1419 } 1420 1421 return err; 1422 } 1423 1424 static const struct mmc_bus_ops mmc_ops = { 1425 .awake = mmc_awake, 1426 .sleep = mmc_sleep, 1427 .remove = mmc_remove, 1428 .detect = mmc_detect, 1429 .suspend = NULL, 1430 .resume = NULL, 1431 .power_restore = mmc_power_restore, 1432 .alive = mmc_alive, 1433 }; 1434 1435 static const struct mmc_bus_ops mmc_ops_unsafe = { 1436 .awake = mmc_awake, 1437 .sleep = mmc_sleep, 1438 .remove = mmc_remove, 1439 .detect = mmc_detect, 1440 .suspend = mmc_suspend, 1441 .resume = mmc_resume, 1442 .power_restore = mmc_power_restore, 1443 .alive = mmc_alive, 1444 }; 1445 1446 static void mmc_attach_bus_ops(struct mmc_host *host) 1447 { 1448 const struct mmc_bus_ops *bus_ops; 1449 1450 if (!mmc_card_is_removable(host)) 1451 bus_ops = &mmc_ops_unsafe; 1452 else 1453 bus_ops = &mmc_ops; 1454 mmc_attach_bus(host, bus_ops); 1455 } 1456 1457 /* 1458 * Starting point for MMC card init. 1459 */ 1460 int mmc_attach_mmc(struct mmc_host *host) 1461 { 1462 int err; 1463 u32 ocr; 1464 1465 BUG_ON(!host); 1466 WARN_ON(!host->claimed); 1467 1468 /* Set correct bus mode for MMC before attempting attach */ 1469 if (!mmc_host_is_spi(host)) 1470 mmc_set_bus_mode(host, MMC_BUSMODE_OPENDRAIN); 1471 1472 err = mmc_send_op_cond(host, 0, &ocr); 1473 if (err) 1474 return err; 1475 1476 mmc_attach_bus_ops(host); 1477 if (host->ocr_avail_mmc) 1478 host->ocr_avail = host->ocr_avail_mmc; 1479 1480 /* 1481 * We need to get OCR a different way for SPI. 1482 */ 1483 if (mmc_host_is_spi(host)) { 1484 err = mmc_spi_read_ocr(host, 1, &ocr); 1485 if (err) 1486 goto err; 1487 } 1488 1489 /* 1490 * Sanity check the voltages that the card claims to 1491 * support. 1492 */ 1493 if (ocr & 0x7F) { 1494 pr_warning("%s: card claims to support voltages " 1495 "below the defined range. These will be ignored.\n", 1496 mmc_hostname(host)); 1497 ocr &= ~0x7F; 1498 } 1499 1500 host->ocr = mmc_select_voltage(host, ocr); 1501 1502 /* 1503 * Can we support the voltage of the card? 1504 */ 1505 if (!host->ocr) { 1506 err = -EINVAL; 1507 goto err; 1508 } 1509 1510 /* 1511 * Detect and init the card. 1512 */ 1513 err = mmc_init_card(host, host->ocr, NULL); 1514 if (err) 1515 goto err; 1516 1517 mmc_release_host(host); 1518 err = mmc_add_card(host->card); 1519 mmc_claim_host(host); 1520 if (err) 1521 goto remove_card; 1522 1523 return 0; 1524 1525 remove_card: 1526 mmc_release_host(host); 1527 mmc_remove_card(host->card); 1528 mmc_claim_host(host); 1529 host->card = NULL; 1530 err: 1531 mmc_detach_bus(host); 1532 1533 pr_err("%s: error %d whilst initialising MMC card\n", 1534 mmc_hostname(host), err); 1535 1536 return err; 1537 } 1538