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_32_33: 699 case MMC_VDD_33_34: 700 case MMC_VDD_34_35: 701 case MMC_VDD_35_36: 702 if (host->ios.clock <= 26000000) 703 index = EXT_CSD_PWR_CL_26_360; 704 else if (host->ios.clock <= 52000000) 705 index = (bus_width <= EXT_CSD_BUS_WIDTH_8) ? 706 EXT_CSD_PWR_CL_52_360 : 707 EXT_CSD_PWR_CL_DDR_52_360; 708 else if (host->ios.clock <= 200000000) 709 index = EXT_CSD_PWR_CL_200_360; 710 break; 711 default: 712 pr_warning("%s: Voltage range not supported " 713 "for power class.\n", mmc_hostname(host)); 714 return -EINVAL; 715 } 716 717 pwrclass_val = ext_csd[index]; 718 719 if (bus_width & (EXT_CSD_BUS_WIDTH_8 | EXT_CSD_DDR_BUS_WIDTH_8)) 720 pwrclass_val = (pwrclass_val & EXT_CSD_PWR_CL_8BIT_MASK) >> 721 EXT_CSD_PWR_CL_8BIT_SHIFT; 722 else 723 pwrclass_val = (pwrclass_val & EXT_CSD_PWR_CL_4BIT_MASK) >> 724 EXT_CSD_PWR_CL_4BIT_SHIFT; 725 726 /* If the power class is different from the default value */ 727 if (pwrclass_val > 0) { 728 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL, 729 EXT_CSD_POWER_CLASS, 730 pwrclass_val, 731 card->ext_csd.generic_cmd6_time); 732 } 733 734 return err; 735 } 736 737 /* 738 * Selects the desired buswidth and switch to the HS200 mode 739 * if bus width set without error 740 */ 741 static int mmc_select_hs200(struct mmc_card *card) 742 { 743 int idx, err = 0; 744 struct mmc_host *host; 745 static unsigned ext_csd_bits[] = { 746 EXT_CSD_BUS_WIDTH_4, 747 EXT_CSD_BUS_WIDTH_8, 748 }; 749 static unsigned bus_widths[] = { 750 MMC_BUS_WIDTH_4, 751 MMC_BUS_WIDTH_8, 752 }; 753 754 BUG_ON(!card); 755 756 host = card->host; 757 758 if (card->ext_csd.card_type & EXT_CSD_CARD_TYPE_SDR_1_2V && 759 host->caps2 & MMC_CAP2_HS200_1_2V_SDR) 760 if (mmc_set_signal_voltage(host, MMC_SIGNAL_VOLTAGE_120, 0)) 761 err = mmc_set_signal_voltage(host, 762 MMC_SIGNAL_VOLTAGE_180, 0); 763 764 /* If fails try again during next card power cycle */ 765 if (err) 766 goto err; 767 768 idx = (host->caps & MMC_CAP_8_BIT_DATA) ? 1 : 0; 769 770 /* 771 * Unlike SD, MMC cards dont have a configuration register to notify 772 * supported bus width. So bus test command should be run to identify 773 * the supported bus width or compare the ext csd values of current 774 * bus width and ext csd values of 1 bit mode read earlier. 775 */ 776 for (; idx >= 0; idx--) { 777 778 /* 779 * Host is capable of 8bit transfer, then switch 780 * the device to work in 8bit transfer mode. If the 781 * mmc switch command returns error then switch to 782 * 4bit transfer mode. On success set the corresponding 783 * bus width on the host. 784 */ 785 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL, 786 EXT_CSD_BUS_WIDTH, 787 ext_csd_bits[idx], 788 card->ext_csd.generic_cmd6_time); 789 if (err) 790 continue; 791 792 mmc_set_bus_width(card->host, bus_widths[idx]); 793 794 if (!(host->caps & MMC_CAP_BUS_WIDTH_TEST)) 795 err = mmc_compare_ext_csds(card, bus_widths[idx]); 796 else 797 err = mmc_bus_test(card, bus_widths[idx]); 798 if (!err) 799 break; 800 } 801 802 /* switch to HS200 mode if bus width set successfully */ 803 if (!err) 804 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL, 805 EXT_CSD_HS_TIMING, 2, 0); 806 err: 807 return err; 808 } 809 810 /* 811 * Handle the detection and initialisation of a card. 812 * 813 * In the case of a resume, "oldcard" will contain the card 814 * we're trying to reinitialise. 815 */ 816 static int mmc_init_card(struct mmc_host *host, u32 ocr, 817 struct mmc_card *oldcard) 818 { 819 struct mmc_card *card; 820 int err, ddr = 0; 821 u32 cid[4]; 822 unsigned int max_dtr; 823 u32 rocr; 824 u8 *ext_csd = NULL; 825 826 BUG_ON(!host); 827 WARN_ON(!host->claimed); 828 829 /* Set correct bus mode for MMC before attempting init */ 830 if (!mmc_host_is_spi(host)) 831 mmc_set_bus_mode(host, MMC_BUSMODE_OPENDRAIN); 832 833 /* Initialization should be done at 3.3 V I/O voltage. */ 834 mmc_set_signal_voltage(host, MMC_SIGNAL_VOLTAGE_330, 0); 835 836 /* 837 * Since we're changing the OCR value, we seem to 838 * need to tell some cards to go back to the idle 839 * state. We wait 1ms to give cards time to 840 * respond. 841 * mmc_go_idle is needed for eMMC that are asleep 842 */ 843 mmc_go_idle(host); 844 845 /* The extra bit indicates that we support high capacity */ 846 err = mmc_send_op_cond(host, ocr | (1 << 30), &rocr); 847 if (err) 848 goto err; 849 850 /* 851 * For SPI, enable CRC as appropriate. 852 */ 853 if (mmc_host_is_spi(host)) { 854 err = mmc_spi_set_crc(host, use_spi_crc); 855 if (err) 856 goto err; 857 } 858 859 /* 860 * Fetch CID from card. 861 */ 862 if (mmc_host_is_spi(host)) 863 err = mmc_send_cid(host, cid); 864 else 865 err = mmc_all_send_cid(host, cid); 866 if (err) 867 goto err; 868 869 if (oldcard) { 870 if (memcmp(cid, oldcard->raw_cid, sizeof(cid)) != 0) { 871 err = -ENOENT; 872 goto err; 873 } 874 875 card = oldcard; 876 } else { 877 /* 878 * Allocate card structure. 879 */ 880 card = mmc_alloc_card(host, &mmc_type); 881 if (IS_ERR(card)) { 882 err = PTR_ERR(card); 883 goto err; 884 } 885 886 card->type = MMC_TYPE_MMC; 887 card->rca = 1; 888 memcpy(card->raw_cid, cid, sizeof(card->raw_cid)); 889 } 890 891 /* 892 * For native busses: set card RCA and quit open drain mode. 893 */ 894 if (!mmc_host_is_spi(host)) { 895 err = mmc_set_relative_addr(card); 896 if (err) 897 goto free_card; 898 899 mmc_set_bus_mode(host, MMC_BUSMODE_PUSHPULL); 900 } 901 902 if (!oldcard) { 903 /* 904 * Fetch CSD from card. 905 */ 906 err = mmc_send_csd(card, card->raw_csd); 907 if (err) 908 goto free_card; 909 910 err = mmc_decode_csd(card); 911 if (err) 912 goto free_card; 913 err = mmc_decode_cid(card); 914 if (err) 915 goto free_card; 916 } 917 918 /* 919 * Select card, as all following commands rely on that. 920 */ 921 if (!mmc_host_is_spi(host)) { 922 err = mmc_select_card(card); 923 if (err) 924 goto free_card; 925 } 926 927 if (!oldcard) { 928 /* 929 * Fetch and process extended CSD. 930 */ 931 932 err = mmc_get_ext_csd(card, &ext_csd); 933 if (err) 934 goto free_card; 935 err = mmc_read_ext_csd(card, ext_csd); 936 if (err) 937 goto free_card; 938 939 /* If doing byte addressing, check if required to do sector 940 * addressing. Handle the case of <2GB cards needing sector 941 * addressing. See section 8.1 JEDEC Standard JED84-A441; 942 * ocr register has bit 30 set for sector addressing. 943 */ 944 if (!(mmc_card_blockaddr(card)) && (rocr & (1<<30))) 945 mmc_card_set_blockaddr(card); 946 947 /* Erase size depends on CSD and Extended CSD */ 948 mmc_set_erase_size(card); 949 } 950 951 /* 952 * If enhanced_area_en is TRUE, host needs to enable ERASE_GRP_DEF 953 * bit. This bit will be lost every time after a reset or power off. 954 */ 955 if (card->ext_csd.enhanced_area_en) { 956 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL, 957 EXT_CSD_ERASE_GROUP_DEF, 1, 958 card->ext_csd.generic_cmd6_time); 959 960 if (err && err != -EBADMSG) 961 goto free_card; 962 963 if (err) { 964 err = 0; 965 /* 966 * Just disable enhanced area off & sz 967 * will try to enable ERASE_GROUP_DEF 968 * during next time reinit 969 */ 970 card->ext_csd.enhanced_area_offset = -EINVAL; 971 card->ext_csd.enhanced_area_size = -EINVAL; 972 } else { 973 card->ext_csd.erase_group_def = 1; 974 /* 975 * enable ERASE_GRP_DEF successfully. 976 * This will affect the erase size, so 977 * here need to reset erase size 978 */ 979 mmc_set_erase_size(card); 980 } 981 } 982 983 /* 984 * Ensure eMMC user default partition is enabled 985 */ 986 if (card->ext_csd.part_config & EXT_CSD_PART_CONFIG_ACC_MASK) { 987 card->ext_csd.part_config &= ~EXT_CSD_PART_CONFIG_ACC_MASK; 988 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL, EXT_CSD_PART_CONFIG, 989 card->ext_csd.part_config, 990 card->ext_csd.part_time); 991 if (err && err != -EBADMSG) 992 goto free_card; 993 } 994 995 /* 996 * If the host supports the power_off_notify capability then 997 * set the notification byte in the ext_csd register of device 998 */ 999 if ((host->caps2 & MMC_CAP2_POWEROFF_NOTIFY) && 1000 (card->ext_csd.rev >= 6)) { 1001 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL, 1002 EXT_CSD_POWER_OFF_NOTIFICATION, 1003 EXT_CSD_POWER_ON, 1004 card->ext_csd.generic_cmd6_time); 1005 if (err && err != -EBADMSG) 1006 goto free_card; 1007 1008 /* 1009 * The err can be -EBADMSG or 0, 1010 * so check for success and update the flag 1011 */ 1012 if (!err) 1013 card->poweroff_notify_state = MMC_POWERED_ON; 1014 } 1015 1016 /* 1017 * Activate high speed (if supported) 1018 */ 1019 if (card->ext_csd.hs_max_dtr != 0) { 1020 err = 0; 1021 if (card->ext_csd.hs_max_dtr > 52000000 && 1022 host->caps2 & MMC_CAP2_HS200) 1023 err = mmc_select_hs200(card); 1024 else if (host->caps & MMC_CAP_MMC_HIGHSPEED) 1025 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL, 1026 EXT_CSD_HS_TIMING, 1, 1027 card->ext_csd.generic_cmd6_time); 1028 1029 if (err && err != -EBADMSG) 1030 goto free_card; 1031 1032 if (err) { 1033 pr_warning("%s: switch to highspeed failed\n", 1034 mmc_hostname(card->host)); 1035 err = 0; 1036 } else { 1037 if (card->ext_csd.hs_max_dtr > 52000000 && 1038 host->caps2 & MMC_CAP2_HS200) { 1039 mmc_card_set_hs200(card); 1040 mmc_set_timing(card->host, 1041 MMC_TIMING_MMC_HS200); 1042 } else { 1043 mmc_card_set_highspeed(card); 1044 mmc_set_timing(card->host, MMC_TIMING_MMC_HS); 1045 } 1046 } 1047 } 1048 1049 /* 1050 * Enable HPI feature (if supported) 1051 */ 1052 if (card->ext_csd.hpi) { 1053 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL, 1054 EXT_CSD_HPI_MGMT, 1, 0); 1055 if (err && err != -EBADMSG) 1056 goto free_card; 1057 if (err) { 1058 pr_warning("%s: Enabling HPI failed\n", 1059 mmc_hostname(card->host)); 1060 err = 0; 1061 } else 1062 card->ext_csd.hpi_en = 1; 1063 } 1064 1065 /* 1066 * Compute bus speed. 1067 */ 1068 max_dtr = (unsigned int)-1; 1069 1070 if (mmc_card_highspeed(card) || mmc_card_hs200(card)) { 1071 if (max_dtr > card->ext_csd.hs_max_dtr) 1072 max_dtr = card->ext_csd.hs_max_dtr; 1073 } else if (max_dtr > card->csd.max_dtr) { 1074 max_dtr = card->csd.max_dtr; 1075 } 1076 1077 mmc_set_clock(host, max_dtr); 1078 1079 /* 1080 * Indicate DDR mode (if supported). 1081 */ 1082 if (mmc_card_highspeed(card)) { 1083 if ((card->ext_csd.card_type & EXT_CSD_CARD_TYPE_DDR_1_8V) 1084 && ((host->caps & (MMC_CAP_1_8V_DDR | 1085 MMC_CAP_UHS_DDR50)) 1086 == (MMC_CAP_1_8V_DDR | MMC_CAP_UHS_DDR50))) 1087 ddr = MMC_1_8V_DDR_MODE; 1088 else if ((card->ext_csd.card_type & EXT_CSD_CARD_TYPE_DDR_1_2V) 1089 && ((host->caps & (MMC_CAP_1_2V_DDR | 1090 MMC_CAP_UHS_DDR50)) 1091 == (MMC_CAP_1_2V_DDR | MMC_CAP_UHS_DDR50))) 1092 ddr = MMC_1_2V_DDR_MODE; 1093 } 1094 1095 /* 1096 * Indicate HS200 SDR mode (if supported). 1097 */ 1098 if (mmc_card_hs200(card)) { 1099 u32 ext_csd_bits; 1100 u32 bus_width = card->host->ios.bus_width; 1101 1102 /* 1103 * For devices supporting HS200 mode, the bus width has 1104 * to be set before executing the tuning function. If 1105 * set before tuning, then device will respond with CRC 1106 * errors for responses on CMD line. So for HS200 the 1107 * sequence will be 1108 * 1. set bus width 4bit / 8 bit (1 bit not supported) 1109 * 2. switch to HS200 mode 1110 * 3. set the clock to > 52Mhz <=200MHz and 1111 * 4. execute tuning for HS200 1112 */ 1113 if ((host->caps2 & MMC_CAP2_HS200) && 1114 card->host->ops->execute_tuning) 1115 err = card->host->ops->execute_tuning(card->host, 1116 MMC_SEND_TUNING_BLOCK_HS200); 1117 if (err) { 1118 pr_warning("%s: tuning execution failed\n", 1119 mmc_hostname(card->host)); 1120 goto err; 1121 } 1122 1123 ext_csd_bits = (bus_width == MMC_BUS_WIDTH_8) ? 1124 EXT_CSD_BUS_WIDTH_8 : EXT_CSD_BUS_WIDTH_4; 1125 err = mmc_select_powerclass(card, ext_csd_bits, ext_csd); 1126 if (err) { 1127 pr_err("%s: power class selection to bus width %d failed\n", 1128 mmc_hostname(card->host), 1 << bus_width); 1129 goto err; 1130 } 1131 } 1132 1133 /* 1134 * Activate wide bus and DDR (if supported). 1135 */ 1136 if (!mmc_card_hs200(card) && 1137 (card->csd.mmca_vsn >= CSD_SPEC_VER_4) && 1138 (host->caps & (MMC_CAP_4_BIT_DATA | MMC_CAP_8_BIT_DATA))) { 1139 static unsigned ext_csd_bits[][2] = { 1140 { EXT_CSD_BUS_WIDTH_8, EXT_CSD_DDR_BUS_WIDTH_8 }, 1141 { EXT_CSD_BUS_WIDTH_4, EXT_CSD_DDR_BUS_WIDTH_4 }, 1142 { EXT_CSD_BUS_WIDTH_1, EXT_CSD_BUS_WIDTH_1 }, 1143 }; 1144 static unsigned bus_widths[] = { 1145 MMC_BUS_WIDTH_8, 1146 MMC_BUS_WIDTH_4, 1147 MMC_BUS_WIDTH_1 1148 }; 1149 unsigned idx, bus_width = 0; 1150 1151 if (host->caps & MMC_CAP_8_BIT_DATA) 1152 idx = 0; 1153 else 1154 idx = 1; 1155 for (; idx < ARRAY_SIZE(bus_widths); idx++) { 1156 bus_width = bus_widths[idx]; 1157 if (bus_width == MMC_BUS_WIDTH_1) 1158 ddr = 0; /* no DDR for 1-bit width */ 1159 err = mmc_select_powerclass(card, ext_csd_bits[idx][0], 1160 ext_csd); 1161 if (err) 1162 pr_err("%s: power class selection to " 1163 "bus width %d failed\n", 1164 mmc_hostname(card->host), 1165 1 << bus_width); 1166 1167 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL, 1168 EXT_CSD_BUS_WIDTH, 1169 ext_csd_bits[idx][0], 1170 card->ext_csd.generic_cmd6_time); 1171 if (!err) { 1172 mmc_set_bus_width(card->host, bus_width); 1173 1174 /* 1175 * If controller can't handle bus width test, 1176 * compare ext_csd previously read in 1 bit mode 1177 * against ext_csd at new bus width 1178 */ 1179 if (!(host->caps & MMC_CAP_BUS_WIDTH_TEST)) 1180 err = mmc_compare_ext_csds(card, 1181 bus_width); 1182 else 1183 err = mmc_bus_test(card, bus_width); 1184 if (!err) 1185 break; 1186 } 1187 } 1188 1189 if (!err && ddr) { 1190 err = mmc_select_powerclass(card, ext_csd_bits[idx][1], 1191 ext_csd); 1192 if (err) 1193 pr_err("%s: power class selection to " 1194 "bus width %d ddr %d failed\n", 1195 mmc_hostname(card->host), 1196 1 << bus_width, ddr); 1197 1198 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL, 1199 EXT_CSD_BUS_WIDTH, 1200 ext_csd_bits[idx][1], 1201 card->ext_csd.generic_cmd6_time); 1202 } 1203 if (err) { 1204 pr_warning("%s: switch to bus width %d ddr %d " 1205 "failed\n", mmc_hostname(card->host), 1206 1 << bus_width, ddr); 1207 goto free_card; 1208 } else if (ddr) { 1209 /* 1210 * eMMC cards can support 3.3V to 1.2V i/o (vccq) 1211 * signaling. 1212 * 1213 * EXT_CSD_CARD_TYPE_DDR_1_8V means 3.3V or 1.8V vccq. 1214 * 1215 * 1.8V vccq at 3.3V core voltage (vcc) is not required 1216 * in the JEDEC spec for DDR. 1217 * 1218 * Do not force change in vccq since we are obviously 1219 * working and no change to vccq is needed. 1220 * 1221 * WARNING: eMMC rules are NOT the same as SD DDR 1222 */ 1223 if (ddr == MMC_1_2V_DDR_MODE) { 1224 err = mmc_set_signal_voltage(host, 1225 MMC_SIGNAL_VOLTAGE_120, 0); 1226 if (err) 1227 goto err; 1228 } 1229 mmc_card_set_ddr_mode(card); 1230 mmc_set_timing(card->host, MMC_TIMING_UHS_DDR50); 1231 mmc_set_bus_width(card->host, bus_width); 1232 } 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 /* 1277 * Host is being removed. Free up the current card. 1278 */ 1279 static void mmc_remove(struct mmc_host *host) 1280 { 1281 BUG_ON(!host); 1282 BUG_ON(!host->card); 1283 1284 mmc_remove_card(host->card); 1285 host->card = NULL; 1286 } 1287 1288 /* 1289 * Card detection - card is alive. 1290 */ 1291 static int mmc_alive(struct mmc_host *host) 1292 { 1293 return mmc_send_status(host->card, NULL); 1294 } 1295 1296 /* 1297 * Card detection callback from host. 1298 */ 1299 static void mmc_detect(struct mmc_host *host) 1300 { 1301 int err; 1302 1303 BUG_ON(!host); 1304 BUG_ON(!host->card); 1305 1306 mmc_claim_host(host); 1307 1308 /* 1309 * Just check if our card has been removed. 1310 */ 1311 err = _mmc_detect_card_removed(host); 1312 1313 mmc_release_host(host); 1314 1315 if (err) { 1316 mmc_remove(host); 1317 1318 mmc_claim_host(host); 1319 mmc_detach_bus(host); 1320 mmc_power_off(host); 1321 mmc_release_host(host); 1322 } 1323 } 1324 1325 /* 1326 * Suspend callback from host. 1327 */ 1328 static int mmc_suspend(struct mmc_host *host) 1329 { 1330 int err = 0; 1331 1332 BUG_ON(!host); 1333 BUG_ON(!host->card); 1334 1335 mmc_claim_host(host); 1336 if (mmc_card_can_sleep(host)) { 1337 err = mmc_card_sleep(host); 1338 if (!err) 1339 mmc_card_set_sleep(host->card); 1340 } else if (!mmc_host_is_spi(host)) 1341 mmc_deselect_cards(host); 1342 host->card->state &= ~(MMC_STATE_HIGHSPEED | MMC_STATE_HIGHSPEED_200); 1343 mmc_release_host(host); 1344 1345 return err; 1346 } 1347 1348 /* 1349 * Resume callback from host. 1350 * 1351 * This function tries to determine if the same card is still present 1352 * and, if so, restore all state to it. 1353 */ 1354 static int mmc_resume(struct mmc_host *host) 1355 { 1356 int err; 1357 1358 BUG_ON(!host); 1359 BUG_ON(!host->card); 1360 1361 mmc_claim_host(host); 1362 if (mmc_card_is_sleep(host->card)) { 1363 err = mmc_card_awake(host); 1364 mmc_card_clr_sleep(host->card); 1365 } else 1366 err = mmc_init_card(host, host->ocr, host->card); 1367 mmc_release_host(host); 1368 1369 return err; 1370 } 1371 1372 static int mmc_power_restore(struct mmc_host *host) 1373 { 1374 int ret; 1375 1376 host->card->state &= ~(MMC_STATE_HIGHSPEED | MMC_STATE_HIGHSPEED_200); 1377 mmc_card_clr_sleep(host->card); 1378 mmc_claim_host(host); 1379 ret = mmc_init_card(host, host->ocr, host->card); 1380 mmc_release_host(host); 1381 1382 return ret; 1383 } 1384 1385 static int mmc_sleep(struct mmc_host *host) 1386 { 1387 struct mmc_card *card = host->card; 1388 int err = -ENOSYS; 1389 1390 if (card && card->ext_csd.rev >= 3) { 1391 err = mmc_card_sleepawake(host, 1); 1392 if (err < 0) 1393 pr_debug("%s: Error %d while putting card into sleep", 1394 mmc_hostname(host), err); 1395 } 1396 1397 return err; 1398 } 1399 1400 static int mmc_awake(struct mmc_host *host) 1401 { 1402 struct mmc_card *card = host->card; 1403 int err = -ENOSYS; 1404 1405 if (card && card->ext_csd.rev >= 3) { 1406 err = mmc_card_sleepawake(host, 0); 1407 if (err < 0) 1408 pr_debug("%s: Error %d while awaking sleeping card", 1409 mmc_hostname(host), err); 1410 } 1411 1412 return err; 1413 } 1414 1415 static const struct mmc_bus_ops mmc_ops = { 1416 .awake = mmc_awake, 1417 .sleep = mmc_sleep, 1418 .remove = mmc_remove, 1419 .detect = mmc_detect, 1420 .suspend = NULL, 1421 .resume = NULL, 1422 .power_restore = mmc_power_restore, 1423 .alive = mmc_alive, 1424 }; 1425 1426 static const struct mmc_bus_ops mmc_ops_unsafe = { 1427 .awake = mmc_awake, 1428 .sleep = mmc_sleep, 1429 .remove = mmc_remove, 1430 .detect = mmc_detect, 1431 .suspend = mmc_suspend, 1432 .resume = mmc_resume, 1433 .power_restore = mmc_power_restore, 1434 .alive = mmc_alive, 1435 }; 1436 1437 static void mmc_attach_bus_ops(struct mmc_host *host) 1438 { 1439 const struct mmc_bus_ops *bus_ops; 1440 1441 if (!mmc_card_is_removable(host)) 1442 bus_ops = &mmc_ops_unsafe; 1443 else 1444 bus_ops = &mmc_ops; 1445 mmc_attach_bus(host, bus_ops); 1446 } 1447 1448 /* 1449 * Starting point for MMC card init. 1450 */ 1451 int mmc_attach_mmc(struct mmc_host *host) 1452 { 1453 int err; 1454 u32 ocr; 1455 1456 BUG_ON(!host); 1457 WARN_ON(!host->claimed); 1458 1459 /* Set correct bus mode for MMC before attempting attach */ 1460 if (!mmc_host_is_spi(host)) 1461 mmc_set_bus_mode(host, MMC_BUSMODE_OPENDRAIN); 1462 1463 err = mmc_send_op_cond(host, 0, &ocr); 1464 if (err) 1465 return err; 1466 1467 mmc_attach_bus_ops(host); 1468 if (host->ocr_avail_mmc) 1469 host->ocr_avail = host->ocr_avail_mmc; 1470 1471 /* 1472 * We need to get OCR a different way for SPI. 1473 */ 1474 if (mmc_host_is_spi(host)) { 1475 err = mmc_spi_read_ocr(host, 1, &ocr); 1476 if (err) 1477 goto err; 1478 } 1479 1480 /* 1481 * Sanity check the voltages that the card claims to 1482 * support. 1483 */ 1484 if (ocr & 0x7F) { 1485 pr_warning("%s: card claims to support voltages " 1486 "below the defined range. These will be ignored.\n", 1487 mmc_hostname(host)); 1488 ocr &= ~0x7F; 1489 } 1490 1491 host->ocr = mmc_select_voltage(host, ocr); 1492 1493 /* 1494 * Can we support the voltage of the card? 1495 */ 1496 if (!host->ocr) { 1497 err = -EINVAL; 1498 goto err; 1499 } 1500 1501 /* 1502 * Detect and init the card. 1503 */ 1504 err = mmc_init_card(host, host->ocr, NULL); 1505 if (err) 1506 goto err; 1507 1508 mmc_release_host(host); 1509 err = mmc_add_card(host->card); 1510 mmc_claim_host(host); 1511 if (err) 1512 goto remove_card; 1513 1514 return 0; 1515 1516 remove_card: 1517 mmc_release_host(host); 1518 mmc_remove_card(host->card); 1519 mmc_claim_host(host); 1520 host->card = NULL; 1521 err: 1522 mmc_detach_bus(host); 1523 1524 pr_err("%s: error %d whilst initialising MMC card\n", 1525 mmc_hostname(host), err); 1526 1527 return err; 1528 } 1529