drivers/mmc/core/mmc.c

   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/of.h>
  15 #include <linux/slab.h>
  16 #include <linux/stat.h>
  17 #include <linux/pm_runtime.h>
  18
  19 #include <linux/mmc/host.h>
  20 #include <linux/mmc/card.h>
  21 #include <linux/mmc/mmc.h>
  22
  23 #include "core.h"
  24 #include "card.h"
  25 #include "host.h"
  26 #include "bus.h"
  27 #include "mmc_ops.h"
  28 #include "quirks.h"
  29 #include "sd_ops.h"
  30 #include "pwrseq.h"
  31
  32 #define DEFAULT_CMD6_TIMEOUT_MS 500
  33
  34 static const unsigned int tran_exp[] = {
  35         10000,          100000,         1000000,        10000000,
  36         0,              0,              0,              0
  37 };
  38
  39 static const unsigned char tran_mant[] = {
  40         0,      10,     12,     13,     15,     20,     25,     30,
  41         35,     40,     45,     50,     55,     60,     70,     80,
  42 };
  43
  44 static const unsigned int taac_exp[] = {
  45         1,      10,     100,    1000,   10000,  100000, 1000000, 10000000,
  46 };
  47
  48 static const unsigned int taac_mant[] = {
  49         0,      10,     12,     13,     15,     20,     25,     30,
  50         35,     40,     45,     50,     55,     60,     70,     80,
  51 };
  52
  53 #define UNSTUFF_BITS(resp,start,size)                                   \
  54         ({                                                              \
  55                 const int __size = size;                                \
  56                 const u32 __mask = (__size < 32 ? 1 << __size : 0) - 1; \
  57                 const int __off = 3 - ((start) / 32);                   \
  58                 const int __shft = (start) & 31;                        \
  59                 u32 __res;                                              \
  60                                                                         \
  61                 __res = resp[__off] >> __shft;                          \
  62                 if (__size + __shft > 32)                               \
  63                         __res |= resp[__off-1] << ((32 - __shft) % 32); \
  64                 __res & __mask;                                         \
  65         })
  66
  67 /*
  68  * Given the decoded CSD structure, decode the raw CID to our CID structure.
  69  */
  70 static int mmc_decode_cid(struct mmc_card *card)
  71 {
  72         u32 *resp = card->raw_cid;
  73
  74         /*
  75          * The selection of the format here is based upon published
  76          * specs from sandisk and from what people have reported.
  77          */
  78         switch (card->csd.mmca_vsn) {
  79         case 0: /* MMC v1.0 - v1.2 */
  80         case 1: /* MMC v1.4 */
  81                 card->cid.manfid        = UNSTUFF_BITS(resp, 104, 24);
  82                 card->cid.prod_name[0]  = UNSTUFF_BITS(resp, 96, 8);
  83                 card->cid.prod_name[1]  = UNSTUFF_BITS(resp, 88, 8);
  84                 card->cid.prod_name[2]  = UNSTUFF_BITS(resp, 80, 8);
  85                 card->cid.prod_name[3]  = UNSTUFF_BITS(resp, 72, 8);
  86                 card->cid.prod_name[4]  = UNSTUFF_BITS(resp, 64, 8);
  87                 card->cid.prod_name[5]  = UNSTUFF_BITS(resp, 56, 8);
  88                 card->cid.prod_name[6]  = UNSTUFF_BITS(resp, 48, 8);
  89                 card->cid.hwrev         = UNSTUFF_BITS(resp, 44, 4);
  90                 card->cid.fwrev         = UNSTUFF_BITS(resp, 40, 4);
  91                 card->cid.serial        = UNSTUFF_BITS(resp, 16, 24);
  92                 card->cid.month         = UNSTUFF_BITS(resp, 12, 4);
  93                 card->cid.year          = UNSTUFF_BITS(resp, 8, 4) + 1997;
  94                 break;
  95
  96         case 2: /* MMC v2.0 - v2.2 */
  97         case 3: /* MMC v3.1 - v3.3 */
  98         case 4: /* MMC v4 */
  99                 card->cid.manfid        = UNSTUFF_BITS(resp, 120, 8);
 100                 card->cid.oemid         = UNSTUFF_BITS(resp, 104, 16);
 101                 card->cid.prod_name[0]  = UNSTUFF_BITS(resp, 96, 8);
 102                 card->cid.prod_name[1]  = UNSTUFF_BITS(resp, 88, 8);
 103                 card->cid.prod_name[2]  = UNSTUFF_BITS(resp, 80, 8);
 104                 card->cid.prod_name[3]  = UNSTUFF_BITS(resp, 72, 8);
 105                 card->cid.prod_name[4]  = UNSTUFF_BITS(resp, 64, 8);
 106                 card->cid.prod_name[5]  = UNSTUFF_BITS(resp, 56, 8);
 107                 card->cid.prv           = UNSTUFF_BITS(resp, 48, 8);
 108                 card->cid.serial        = UNSTUFF_BITS(resp, 16, 32);
 109                 card->cid.month         = UNSTUFF_BITS(resp, 12, 4);
 110                 card->cid.year          = UNSTUFF_BITS(resp, 8, 4) + 1997;
 111                 break;
 112
 113         default:
 114                 pr_err("%s: card has unknown MMCA version %d\n",
 115                         mmc_hostname(card->host), card->csd.mmca_vsn);
 116                 return -EINVAL;
 117         }
 118
 119         return 0;
 120 }
 121
 122 static void mmc_set_erase_size(struct mmc_card *card)
 123 {
 124         if (card->ext_csd.erase_group_def & 1)
 125                 card->erase_size = card->ext_csd.hc_erase_size;
 126         else
 127                 card->erase_size = card->csd.erase_size;
 128
 129         mmc_init_erase(card);
 130 }
 131
 132 /*
 133  * Given a 128-bit response, decode to our card CSD structure.
 134  */
 135 static int mmc_decode_csd(struct mmc_card *card)
 136 {
 137         struct mmc_csd *csd = &card->csd;
 138         unsigned int e, m, a, b;
 139         u32 *resp = card->raw_csd;
 140
 141         /*
 142          * We only understand CSD structure v1.1 and v1.2.
 143          * v1.2 has extra information in bits 15, 11 and 10.
 144          * We also support eMMC v4.4 & v4.41.
 145          */
 146         csd->structure = UNSTUFF_BITS(resp, 126, 2);
 147         if (csd->structure == 0) {
 148                 pr_err("%s: unrecognised CSD structure version %d\n",
 149                         mmc_hostname(card->host), csd->structure);
 150                 return -EINVAL;
 151         }
 152
 153         csd->mmca_vsn    = UNSTUFF_BITS(resp, 122, 4);
 154         m = UNSTUFF_BITS(resp, 115, 4);
 155         e = UNSTUFF_BITS(resp, 112, 3);
 156         csd->taac_ns     = (taac_exp[e] * taac_mant[m] + 9) / 10;
 157         csd->taac_clks   = UNSTUFF_BITS(resp, 104, 8) * 100;
 158
 159         m = UNSTUFF_BITS(resp, 99, 4);
 160         e = UNSTUFF_BITS(resp, 96, 3);
 161         csd->max_dtr      = tran_exp[e] * tran_mant[m];
 162         csd->cmdclass     = UNSTUFF_BITS(resp, 84, 12);
 163
 164         e = UNSTUFF_BITS(resp, 47, 3);
 165         m = UNSTUFF_BITS(resp, 62, 12);
 166         csd->capacity     = (1 + m) << (e + 2);
 167
 168         csd->read_blkbits = UNSTUFF_BITS(resp, 80, 4);
 169         csd->read_partial = UNSTUFF_BITS(resp, 79, 1);
 170         csd->write_misalign = UNSTUFF_BITS(resp, 78, 1);
 171         csd->read_misalign = UNSTUFF_BITS(resp, 77, 1);
 172         csd->dsr_imp = UNSTUFF_BITS(resp, 76, 1);
 173         csd->r2w_factor = UNSTUFF_BITS(resp, 26, 3);
 174         csd->write_blkbits = UNSTUFF_BITS(resp, 22, 4);
 175         csd->write_partial = UNSTUFF_BITS(resp, 21, 1);
 176
 177         if (csd->write_blkbits >= 9) {
 178                 a = UNSTUFF_BITS(resp, 42, 5);
 179                 b = UNSTUFF_BITS(resp, 37, 5);
 180                 csd->erase_size = (a + 1) * (b + 1);
 181                 csd->erase_size <<= csd->write_blkbits - 9;
 182         }
 183
 184         return 0;
 185 }
 186
 187 static void mmc_select_card_type(struct mmc_card *card)
 188 {
 189         struct mmc_host *host = card->host;
 190         u8 card_type = card->ext_csd.raw_card_type;
 191         u32 caps = host->caps, caps2 = host->caps2;
 192         unsigned int hs_max_dtr = 0, hs200_max_dtr = 0;
 193         unsigned int avail_type = 0;
 194
 195         if (caps & MMC_CAP_MMC_HIGHSPEED &&
 196             card_type & EXT_CSD_CARD_TYPE_HS_26) {
 197                 hs_max_dtr = MMC_HIGH_26_MAX_DTR;
 198                 avail_type |= EXT_CSD_CARD_TYPE_HS_26;
 199         }
 200
 201         if (caps & MMC_CAP_MMC_HIGHSPEED &&
 202             card_type & EXT_CSD_CARD_TYPE_HS_52) {
 203                 hs_max_dtr = MMC_HIGH_52_MAX_DTR;
 204                 avail_type |= EXT_CSD_CARD_TYPE_HS_52;
 205         }
 206
 207         if (caps & (MMC_CAP_1_8V_DDR | MMC_CAP_3_3V_DDR) &&
 208             card_type & EXT_CSD_CARD_TYPE_DDR_1_8V) {
 209                 hs_max_dtr = MMC_HIGH_DDR_MAX_DTR;
 210                 avail_type |= EXT_CSD_CARD_TYPE_DDR_1_8V;
 211         }
 212
 213         if (caps & MMC_CAP_1_2V_DDR &&
 214             card_type & EXT_CSD_CARD_TYPE_DDR_1_2V) {
 215                 hs_max_dtr = MMC_HIGH_DDR_MAX_DTR;
 216                 avail_type |= EXT_CSD_CARD_TYPE_DDR_1_2V;
 217         }
 218
 219         if (caps2 & MMC_CAP2_HS200_1_8V_SDR &&
 220             card_type & EXT_CSD_CARD_TYPE_HS200_1_8V) {
 221                 hs200_max_dtr = MMC_HS200_MAX_DTR;
 222                 avail_type |= EXT_CSD_CARD_TYPE_HS200_1_8V;
 223         }
 224
 225         if (caps2 & MMC_CAP2_HS200_1_2V_SDR &&
 226             card_type & EXT_CSD_CARD_TYPE_HS200_1_2V) {
 227                 hs200_max_dtr = MMC_HS200_MAX_DTR;
 228                 avail_type |= EXT_CSD_CARD_TYPE_HS200_1_2V;
 229         }
 230
 231         if (caps2 & MMC_CAP2_HS400_1_8V &&
 232             card_type & EXT_CSD_CARD_TYPE_HS400_1_8V) {
 233                 hs200_max_dtr = MMC_HS200_MAX_DTR;
 234                 avail_type |= EXT_CSD_CARD_TYPE_HS400_1_8V;
 235         }
 236
 237         if (caps2 & MMC_CAP2_HS400_1_2V &&
 238             card_type & EXT_CSD_CARD_TYPE_HS400_1_2V) {
 239                 hs200_max_dtr = MMC_HS200_MAX_DTR;
 240                 avail_type |= EXT_CSD_CARD_TYPE_HS400_1_2V;
 241         }
 242
 243         if ((caps2 & MMC_CAP2_HS400_ES) &&
 244             card->ext_csd.strobe_support &&
 245             (avail_type & EXT_CSD_CARD_TYPE_HS400))
 246                 avail_type |= EXT_CSD_CARD_TYPE_HS400ES;
 247
 248         card->ext_csd.hs_max_dtr = hs_max_dtr;
 249         card->ext_csd.hs200_max_dtr = hs200_max_dtr;
 250         card->mmc_avail_type = avail_type;
 251 }
 252
 253 static void mmc_manage_enhanced_area(struct mmc_card *card, u8 *ext_csd)
 254 {
 255         u8 hc_erase_grp_sz, hc_wp_grp_sz;
 256
 257         /*
 258          * Disable these attributes by default
 259          */
 260         card->ext_csd.enhanced_area_offset = -EINVAL;
 261         card->ext_csd.enhanced_area_size = -EINVAL;
 262
 263         /*
 264          * Enhanced area feature support -- check whether the eMMC
 265          * card has the Enhanced area enabled.  If so, export enhanced
 266          * area offset and size to user by adding sysfs interface.
 267          */
 268         if ((ext_csd[EXT_CSD_PARTITION_SUPPORT] & 0x2) &&
 269             (ext_csd[EXT_CSD_PARTITION_ATTRIBUTE] & 0x1)) {
 270                 if (card->ext_csd.partition_setting_completed) {
 271                         hc_erase_grp_sz =
 272                                 ext_csd[EXT_CSD_HC_ERASE_GRP_SIZE];
 273                         hc_wp_grp_sz =
 274                                 ext_csd[EXT_CSD_HC_WP_GRP_SIZE];
 275
 276                         /*
 277                          * calculate the enhanced data area offset, in bytes
 278                          */
 279                         card->ext_csd.enhanced_area_offset =
 280                                 (((unsigned long long)ext_csd[139]) << 24) +
 281                                 (((unsigned long long)ext_csd[138]) << 16) +
 282                                 (((unsigned long long)ext_csd[137]) << 8) +
 283                                 (((unsigned long long)ext_csd[136]));
 284                         if (mmc_card_blockaddr(card))
 285                                 card->ext_csd.enhanced_area_offset <<= 9;
 286                         /*
 287                          * calculate the enhanced data area size, in kilobytes
 288                          */
 289                         card->ext_csd.enhanced_area_size =
 290                                 (ext_csd[142] << 16) + (ext_csd[141] << 8) +
 291                                 ext_csd[140];
 292                         card->ext_csd.enhanced_area_size *=
 293                                 (size_t)(hc_erase_grp_sz * hc_wp_grp_sz);
 294                         card->ext_csd.enhanced_area_size <<= 9;
 295                 } else {
 296                         pr_warn("%s: defines enhanced area without partition setting complete\n",
 297                                 mmc_hostname(card->host));
 298                 }
 299         }
 300 }
 301
 302 static void mmc_part_add(struct mmc_card *card, unsigned int size,
 303                          unsigned int part_cfg, char *name, int idx, bool ro,
 304                          int area_type)
 305 {
 306         card->part[card->nr_parts].size = size;
 307         card->part[card->nr_parts].part_cfg = part_cfg;
 308         sprintf(card->part[card->nr_parts].name, name, idx);
 309         card->part[card->nr_parts].force_ro = ro;
 310         card->part[card->nr_parts].area_type = area_type;
 311         card->nr_parts++;
 312 }
 313
 314 static void mmc_manage_gp_partitions(struct mmc_card *card, u8 *ext_csd)
 315 {
 316         int idx;
 317         u8 hc_erase_grp_sz, hc_wp_grp_sz;
 318         unsigned int part_size;
 319
 320         /*
 321          * General purpose partition feature support --
 322          * If ext_csd has the size of general purpose partitions,
 323          * set size, part_cfg, partition name in mmc_part.
 324          */
 325         if (ext_csd[EXT_CSD_PARTITION_SUPPORT] &
 326             EXT_CSD_PART_SUPPORT_PART_EN) {
 327                 hc_erase_grp_sz =
 328                         ext_csd[EXT_CSD_HC_ERASE_GRP_SIZE];
 329                 hc_wp_grp_sz =
 330                         ext_csd[EXT_CSD_HC_WP_GRP_SIZE];
 331
 332                 for (idx = 0; idx < MMC_NUM_GP_PARTITION; idx++) {
 333                         if (!ext_csd[EXT_CSD_GP_SIZE_MULT + idx * 3] &&
 334                             !ext_csd[EXT_CSD_GP_SIZE_MULT + idx * 3 + 1] &&
 335                             !ext_csd[EXT_CSD_GP_SIZE_MULT + idx * 3 + 2])
 336                                 continue;
 337                         if (card->ext_csd.partition_setting_completed == 0) {
 338                                 pr_warn("%s: has partition size defined without partition complete\n",
 339                                         mmc_hostname(card->host));
 340                                 break;
 341                         }
 342                         part_size =
 343                                 (ext_csd[EXT_CSD_GP_SIZE_MULT + idx * 3 + 2]
 344                                 << 16) +
 345                                 (ext_csd[EXT_CSD_GP_SIZE_MULT + idx * 3 + 1]
 346                                 << 8) +
 347                                 ext_csd[EXT_CSD_GP_SIZE_MULT + idx * 3];
 348                         part_size *= (size_t)(hc_erase_grp_sz *
 349                                 hc_wp_grp_sz);
 350                         mmc_part_add(card, part_size << 19,
 351                                 EXT_CSD_PART_CONFIG_ACC_GP0 + idx,
 352                                 "gp%d", idx, false,
 353                                 MMC_BLK_DATA_AREA_GP);
 354                 }
 355         }
 356 }
 357
 358 /* Minimum partition switch timeout in milliseconds */
 359 #define MMC_MIN_PART_SWITCH_TIME        300
 360
 361 /*
 362  * Decode extended CSD.
 363  */
 364 static int mmc_decode_ext_csd(struct mmc_card *card, u8 *ext_csd)
 365 {
 366         int err = 0, idx;
 367         unsigned int part_size;
 368         struct device_node *np;
 369         bool broken_hpi = false;
 370
 371         /* Version is coded in the CSD_STRUCTURE byte in the EXT_CSD register */
 372         card->ext_csd.raw_ext_csd_structure = ext_csd[EXT_CSD_STRUCTURE];
 373         if (card->csd.structure == 3) {
 374                 if (card->ext_csd.raw_ext_csd_structure > 2) {
 375                         pr_err("%s: unrecognised EXT_CSD structure "
 376                                 "version %d\n", mmc_hostname(card->host),
 377                                         card->ext_csd.raw_ext_csd_structure);
 378                         err = -EINVAL;
 379                         goto out;
 380                 }
 381         }
 382
 383         np = mmc_of_find_child_device(card->host, 0);
 384         if (np && of_device_is_compatible(np, "mmc-card"))
 385                 broken_hpi = of_property_read_bool(np, "broken-hpi");
 386         of_node_put(np);
 387
 388         /*
 389          * The EXT_CSD format is meant to be forward compatible. As long
 390          * as CSD_STRUCTURE does not change, all values for EXT_CSD_REV
 391          * are authorized, see JEDEC JESD84-B50 section B.8.
 392          */
 393         card->ext_csd.rev = ext_csd[EXT_CSD_REV];
 394
 395         /* fixup device after ext_csd revision field is updated */
 396         mmc_fixup_device(card, mmc_ext_csd_fixups);
 397
 398         card->ext_csd.raw_sectors[0] = ext_csd[EXT_CSD_SEC_CNT + 0];
 399         card->ext_csd.raw_sectors[1] = ext_csd[EXT_CSD_SEC_CNT + 1];
 400         card->ext_csd.raw_sectors[2] = ext_csd[EXT_CSD_SEC_CNT + 2];
 401         card->ext_csd.raw_sectors[3] = ext_csd[EXT_CSD_SEC_CNT + 3];
 402         if (card->ext_csd.rev >= 2) {
 403                 card->ext_csd.sectors =
 404                         ext_csd[EXT_CSD_SEC_CNT + 0] << 0 |
 405                         ext_csd[EXT_CSD_SEC_CNT + 1] << 8 |
 406                         ext_csd[EXT_CSD_SEC_CNT + 2] << 16 |
 407                         ext_csd[EXT_CSD_SEC_CNT + 3] << 24;
 408
 409                 /* Cards with density > 2GiB are sector addressed */
 410                 if (card->ext_csd.sectors > (2u * 1024 * 1024 * 1024) / 512)
 411                         mmc_card_set_blockaddr(card);
 412         }
 413
 414         card->ext_csd.strobe_support = ext_csd[EXT_CSD_STROBE_SUPPORT];
 415         card->ext_csd.raw_card_type = ext_csd[EXT_CSD_CARD_TYPE];
 416         mmc_select_card_type(card);
 417
 418         card->ext_csd.raw_s_a_timeout = ext_csd[EXT_CSD_S_A_TIMEOUT];
 419         card->ext_csd.raw_erase_timeout_mult =
 420                 ext_csd[EXT_CSD_ERASE_TIMEOUT_MULT];
 421         card->ext_csd.raw_hc_erase_grp_size =
 422                 ext_csd[EXT_CSD_HC_ERASE_GRP_SIZE];
 423         if (card->ext_csd.rev >= 3) {
 424                 u8 sa_shift = ext_csd[EXT_CSD_S_A_TIMEOUT];
 425                 card->ext_csd.part_config = ext_csd[EXT_CSD_PART_CONFIG];
 426
 427                 /* EXT_CSD value is in units of 10ms, but we store in ms */
 428                 card->ext_csd.part_time = 10 * ext_csd[EXT_CSD_PART_SWITCH_TIME];
 429                 /* Some eMMC set the value too low so set a minimum */
 430                 if (card->ext_csd.part_time &&
 431                     card->ext_csd.part_time < MMC_MIN_PART_SWITCH_TIME)
 432                         card->ext_csd.part_time = MMC_MIN_PART_SWITCH_TIME;
 433
 434                 /* Sleep / awake timeout in 100ns units */
 435                 if (sa_shift > 0 && sa_shift <= 0x17)
 436                         card->ext_csd.sa_timeout =
 437                                         1 << ext_csd[EXT_CSD_S_A_TIMEOUT];
 438                 card->ext_csd.erase_group_def =
 439                         ext_csd[EXT_CSD_ERASE_GROUP_DEF];
 440                 card->ext_csd.hc_erase_timeout = 300 *
 441                         ext_csd[EXT_CSD_ERASE_TIMEOUT_MULT];
 442                 card->ext_csd.hc_erase_size =
 443                         ext_csd[EXT_CSD_HC_ERASE_GRP_SIZE] << 10;
 444
 445                 card->ext_csd.rel_sectors = ext_csd[EXT_CSD_REL_WR_SEC_C];
 446
 447                 /*
 448                  * There are two boot regions of equal size, defined in
 449                  * multiples of 128K.
 450                  */
 451                 if (ext_csd[EXT_CSD_BOOT_MULT] && mmc_boot_partition_access(card->host)) {
 452                         for (idx = 0; idx < MMC_NUM_BOOT_PARTITION; idx++) {
 453                                 part_size = ext_csd[EXT_CSD_BOOT_MULT] << 17;
 454                                 mmc_part_add(card, part_size,
 455                                         EXT_CSD_PART_CONFIG_ACC_BOOT0 + idx,
 456                                         "boot%d", idx, true,
 457                                         MMC_BLK_DATA_AREA_BOOT);
 458                         }
 459                 }
 460         }
 461
 462         card->ext_csd.raw_hc_erase_gap_size =
 463                 ext_csd[EXT_CSD_HC_WP_GRP_SIZE];
 464         card->ext_csd.raw_sec_trim_mult =
 465                 ext_csd[EXT_CSD_SEC_TRIM_MULT];
 466         card->ext_csd.raw_sec_erase_mult =
 467                 ext_csd[EXT_CSD_SEC_ERASE_MULT];
 468         card->ext_csd.raw_sec_feature_support =
 469                 ext_csd[EXT_CSD_SEC_FEATURE_SUPPORT];
 470         card->ext_csd.raw_trim_mult =
 471                 ext_csd[EXT_CSD_TRIM_MULT];
 472         card->ext_csd.raw_partition_support = ext_csd[EXT_CSD_PARTITION_SUPPORT];
 473         card->ext_csd.raw_driver_strength = ext_csd[EXT_CSD_DRIVER_STRENGTH];
 474         if (card->ext_csd.rev >= 4) {
 475                 if (ext_csd[EXT_CSD_PARTITION_SETTING_COMPLETED] &
 476                     EXT_CSD_PART_SETTING_COMPLETED)
 477                         card->ext_csd.partition_setting_completed = 1;
 478                 else
 479                         card->ext_csd.partition_setting_completed = 0;
 480
 481                 mmc_manage_enhanced_area(card, ext_csd);
 482
 483                 mmc_manage_gp_partitions(card, ext_csd);
 484
 485                 card->ext_csd.sec_trim_mult =
 486                         ext_csd[EXT_CSD_SEC_TRIM_MULT];
 487                 card->ext_csd.sec_erase_mult =
 488                         ext_csd[EXT_CSD_SEC_ERASE_MULT];
 489                 card->ext_csd.sec_feature_support =
 490                         ext_csd[EXT_CSD_SEC_FEATURE_SUPPORT];
 491                 card->ext_csd.trim_timeout = 300 *
 492                         ext_csd[EXT_CSD_TRIM_MULT];
 493
 494                 /*
 495                  * Note that the call to mmc_part_add above defaults to read
 496                  * only. If this default assumption is changed, the call must
 497                  * take into account the value of boot_locked below.
 498                  */
 499                 card->ext_csd.boot_ro_lock = ext_csd[EXT_CSD_BOOT_WP];
 500                 card->ext_csd.boot_ro_lockable = true;
 501
 502                 /* Save power class values */
 503                 card->ext_csd.raw_pwr_cl_52_195 =
 504                         ext_csd[EXT_CSD_PWR_CL_52_195];
 505                 card->ext_csd.raw_pwr_cl_26_195 =
 506                         ext_csd[EXT_CSD_PWR_CL_26_195];
 507                 card->ext_csd.raw_pwr_cl_52_360 =
 508                         ext_csd[EXT_CSD_PWR_CL_52_360];
 509                 card->ext_csd.raw_pwr_cl_26_360 =
 510                         ext_csd[EXT_CSD_PWR_CL_26_360];
 511                 card->ext_csd.raw_pwr_cl_200_195 =
 512                         ext_csd[EXT_CSD_PWR_CL_200_195];
 513                 card->ext_csd.raw_pwr_cl_200_360 =
 514                         ext_csd[EXT_CSD_PWR_CL_200_360];
 515                 card->ext_csd.raw_pwr_cl_ddr_52_195 =
 516                         ext_csd[EXT_CSD_PWR_CL_DDR_52_195];
 517                 card->ext_csd.raw_pwr_cl_ddr_52_360 =
 518                         ext_csd[EXT_CSD_PWR_CL_DDR_52_360];
 519                 card->ext_csd.raw_pwr_cl_ddr_200_360 =
 520                         ext_csd[EXT_CSD_PWR_CL_DDR_200_360];
 521         }
 522
 523         if (card->ext_csd.rev >= 5) {
 524                 /* Adjust production date as per JEDEC JESD84-B451 */
 525                 if (card->cid.year < 2010)
 526                         card->cid.year += 16;
 527
 528                 /* check whether the eMMC card supports BKOPS */
 529                 if (!mmc_card_broken_hpi(card) &&
 530                     ext_csd[EXT_CSD_BKOPS_SUPPORT] & 0x1) {
 531                         card->ext_csd.bkops = 1;
 532                         card->ext_csd.man_bkops_en =
 533                                         (ext_csd[EXT_CSD_BKOPS_EN] &
 534                                                 EXT_CSD_MANUAL_BKOPS_MASK);
 535                         card->ext_csd.raw_bkops_status =
 536                                 ext_csd[EXT_CSD_BKOPS_STATUS];
 537                         if (card->ext_csd.man_bkops_en)
 538                                 pr_debug("%s: MAN_BKOPS_EN bit is set\n",
 539                                         mmc_hostname(card->host));
 540                         card->ext_csd.auto_bkops_en =
 541                                         (ext_csd[EXT_CSD_BKOPS_EN] &
 542                                                 EXT_CSD_AUTO_BKOPS_MASK);
 543                         if (card->ext_csd.auto_bkops_en)
 544                                 pr_debug("%s: AUTO_BKOPS_EN bit is set\n",
 545                                         mmc_hostname(card->host));
 546                 }
 547
 548                 /* check whether the eMMC card supports HPI */
 549                 if (!mmc_card_broken_hpi(card) &&
 550                     !broken_hpi && (ext_csd[EXT_CSD_HPI_FEATURES] & 0x1)) {
 551                         card->ext_csd.hpi = 1;
 552                         if (ext_csd[EXT_CSD_HPI_FEATURES] & 0x2)
 553                                 card->ext_csd.hpi_cmd = MMC_STOP_TRANSMISSION;
 554                         else
 555                                 card->ext_csd.hpi_cmd = MMC_SEND_STATUS;
 556                         /*
 557                          * Indicate the maximum timeout to close
 558                          * a command interrupted by HPI
 559                          */
 560                         card->ext_csd.out_of_int_time =
 561                                 ext_csd[EXT_CSD_OUT_OF_INTERRUPT_TIME] * 10;
 562                 }
 563
 564                 card->ext_csd.rel_param = ext_csd[EXT_CSD_WR_REL_PARAM];
 565                 card->ext_csd.rst_n_function = ext_csd[EXT_CSD_RST_N_FUNCTION];
 566
 567                 /*
 568                  * RPMB regions are defined in multiples of 128K.
 569                  */
 570                 card->ext_csd.raw_rpmb_size_mult = ext_csd[EXT_CSD_RPMB_MULT];
 571                 if (ext_csd[EXT_CSD_RPMB_MULT] && mmc_host_cmd23(card->host)) {
 572                         mmc_part_add(card, ext_csd[EXT_CSD_RPMB_MULT] << 17,
 573                                 EXT_CSD_PART_CONFIG_ACC_RPMB,
 574                                 "rpmb", 0, false,
 575                                 MMC_BLK_DATA_AREA_RPMB);
 576                 }
 577         }
 578
 579         card->ext_csd.raw_erased_mem_count = ext_csd[EXT_CSD_ERASED_MEM_CONT];
 580         if (ext_csd[EXT_CSD_ERASED_MEM_CONT])
 581                 card->erased_byte = 0xFF;
 582         else
 583                 card->erased_byte = 0x0;
 584
 585         /* eMMC v4.5 or later */
 586         card->ext_csd.generic_cmd6_time = DEFAULT_CMD6_TIMEOUT_MS;
 587         if (card->ext_csd.rev >= 6) {
 588                 card->ext_csd.feature_support |= MMC_DISCARD_FEATURE;
 589
 590                 card->ext_csd.generic_cmd6_time = 10 *
 591                         ext_csd[EXT_CSD_GENERIC_CMD6_TIME];
 592                 card->ext_csd.power_off_longtime = 10 *
 593                         ext_csd[EXT_CSD_POWER_OFF_LONG_TIME];
 594
 595                 card->ext_csd.cache_size =
 596                         ext_csd[EXT_CSD_CACHE_SIZE + 0] << 0 |
 597                         ext_csd[EXT_CSD_CACHE_SIZE + 1] << 8 |
 598                         ext_csd[EXT_CSD_CACHE_SIZE + 2] << 16 |
 599                         ext_csd[EXT_CSD_CACHE_SIZE + 3] << 24;
 600
 601                 if (ext_csd[EXT_CSD_DATA_SECTOR_SIZE] == 1)
 602                         card->ext_csd.data_sector_size = 4096;
 603                 else
 604                         card->ext_csd.data_sector_size = 512;
 605
 606                 if ((ext_csd[EXT_CSD_DATA_TAG_SUPPORT] & 1) &&
 607                     (ext_csd[EXT_CSD_TAG_UNIT_SIZE] <= 8)) {
 608                         card->ext_csd.data_tag_unit_size =
 609                         ((unsigned int) 1 << ext_csd[EXT_CSD_TAG_UNIT_SIZE]) *
 610                         (card->ext_csd.data_sector_size);
 611                 } else {
 612                         card->ext_csd.data_tag_unit_size = 0;
 613                 }
 614
 615                 card->ext_csd.max_packed_writes =
 616                         ext_csd[EXT_CSD_MAX_PACKED_WRITES];
 617                 card->ext_csd.max_packed_reads =
 618                         ext_csd[EXT_CSD_MAX_PACKED_READS];
 619         } else {
 620                 card->ext_csd.data_sector_size = 512;
 621         }
 622
 623         /* eMMC v5 or later */
 624         if (card->ext_csd.rev >= 7) {
 625                 memcpy(card->ext_csd.fwrev, &ext_csd[EXT_CSD_FIRMWARE_VERSION],
 626                        MMC_FIRMWARE_LEN);
 627                 card->ext_csd.ffu_capable =
 628                         (ext_csd[EXT_CSD_SUPPORTED_MODE] & 0x1) &&
 629                         !(ext_csd[EXT_CSD_FW_CONFIG] & 0x1);
 630
 631                 card->ext_csd.pre_eol_info = ext_csd[EXT_CSD_PRE_EOL_INFO];
 632                 card->ext_csd.device_life_time_est_typ_a =
 633                         ext_csd[EXT_CSD_DEVICE_LIFE_TIME_EST_TYP_A];
 634                 card->ext_csd.device_life_time_est_typ_b =
 635                         ext_csd[EXT_CSD_DEVICE_LIFE_TIME_EST_TYP_B];
 636         }
 637
 638         /* eMMC v5.1 or later */
 639         if (card->ext_csd.rev >= 8) {
 640                 card->ext_csd.cmdq_support = ext_csd[EXT_CSD_CMDQ_SUPPORT] &
 641                                              EXT_CSD_CMDQ_SUPPORTED;
 642                 card->ext_csd.cmdq_depth = (ext_csd[EXT_CSD_CMDQ_DEPTH] &
 643                                             EXT_CSD_CMDQ_DEPTH_MASK) + 1;
 644                 /* Exclude inefficiently small queue depths */
 645                 if (card->ext_csd.cmdq_depth <= 2) {
 646                         card->ext_csd.cmdq_support = false;
 647                         card->ext_csd.cmdq_depth = 0;
 648                 }
 649                 if (card->ext_csd.cmdq_support) {
 650                         pr_debug("%s: Command Queue supported depth %u\n",
 651                                  mmc_hostname(card->host),
 652                                  card->ext_csd.cmdq_depth);
 653                 }
 654         }
 655 out:
 656         return err;
 657 }
 658
 659 static int mmc_read_ext_csd(struct mmc_card *card)
 660 {
 661         u8 *ext_csd;
 662         int err;
 663
 664         if (!mmc_can_ext_csd(card))
 665                 return 0;
 666
 667         err = mmc_get_ext_csd(card, &ext_csd);
 668         if (err) {
 669                 /* If the host or the card can't do the switch,
 670                  * fail more gracefully. */
 671                 if ((err != -EINVAL)
 672                  && (err != -ENOSYS)
 673                  && (err != -EFAULT))
 674                         return err;
 675
 676                 /*
 677                  * High capacity cards should have this "magic" size
 678                  * stored in their CSD.
 679                  */
 680                 if (card->csd.capacity == (4096 * 512)) {
 681                         pr_err("%s: unable to read EXT_CSD on a possible high capacity card. Card will be ignored.\n",
 682                                 mmc_hostname(card->host));
 683                 } else {
 684                         pr_warn("%s: unable to read EXT_CSD, performance might suffer\n",
 685                                 mmc_hostname(card->host));
 686                         err = 0;
 687                 }
 688
 689                 return err;
 690         }
 691
 692         err = mmc_decode_ext_csd(card, ext_csd);
 693         kfree(ext_csd);
 694         return err;
 695 }
 696
 697 static int mmc_compare_ext_csds(struct mmc_card *card, unsigned bus_width)
 698 {
 699         u8 *bw_ext_csd;
 700         int err;
 701
 702         if (bus_width == MMC_BUS_WIDTH_1)
 703                 return 0;
 704
 705         err = mmc_get_ext_csd(card, &bw_ext_csd);
 706         if (err)
 707                 return err;
 708
 709         /* only compare read only fields */
 710         err = !((card->ext_csd.raw_partition_support ==
 711                         bw_ext_csd[EXT_CSD_PARTITION_SUPPORT]) &&
 712                 (card->ext_csd.raw_erased_mem_count ==
 713                         bw_ext_csd[EXT_CSD_ERASED_MEM_CONT]) &&
 714                 (card->ext_csd.rev ==
 715                         bw_ext_csd[EXT_CSD_REV]) &&
 716                 (card->ext_csd.raw_ext_csd_structure ==
 717                         bw_ext_csd[EXT_CSD_STRUCTURE]) &&
 718                 (card->ext_csd.raw_card_type ==
 719                         bw_ext_csd[EXT_CSD_CARD_TYPE]) &&
 720                 (card->ext_csd.raw_s_a_timeout ==
 721                         bw_ext_csd[EXT_CSD_S_A_TIMEOUT]) &&
 722                 (card->ext_csd.raw_hc_erase_gap_size ==
 723                         bw_ext_csd[EXT_CSD_HC_WP_GRP_SIZE]) &&
 724                 (card->ext_csd.raw_erase_timeout_mult ==
 725                         bw_ext_csd[EXT_CSD_ERASE_TIMEOUT_MULT]) &&
 726                 (card->ext_csd.raw_hc_erase_grp_size ==
 727                         bw_ext_csd[EXT_CSD_HC_ERASE_GRP_SIZE]) &&
 728                 (card->ext_csd.raw_sec_trim_mult ==
 729                         bw_ext_csd[EXT_CSD_SEC_TRIM_MULT]) &&
 730                 (card->ext_csd.raw_sec_erase_mult ==
 731                         bw_ext_csd[EXT_CSD_SEC_ERASE_MULT]) &&
 732                 (card->ext_csd.raw_sec_feature_support ==
 733                         bw_ext_csd[EXT_CSD_SEC_FEATURE_SUPPORT]) &&
 734                 (card->ext_csd.raw_trim_mult ==
 735                         bw_ext_csd[EXT_CSD_TRIM_MULT]) &&
 736                 (card->ext_csd.raw_sectors[0] ==
 737                         bw_ext_csd[EXT_CSD_SEC_CNT + 0]) &&
 738                 (card->ext_csd.raw_sectors[1] ==
 739                         bw_ext_csd[EXT_CSD_SEC_CNT + 1]) &&
 740                 (card->ext_csd.raw_sectors[2] ==
 741                         bw_ext_csd[EXT_CSD_SEC_CNT + 2]) &&
 742                 (card->ext_csd.raw_sectors[3] ==
 743                         bw_ext_csd[EXT_CSD_SEC_CNT + 3]) &&
 744                 (card->ext_csd.raw_pwr_cl_52_195 ==
 745                         bw_ext_csd[EXT_CSD_PWR_CL_52_195]) &&
 746                 (card->ext_csd.raw_pwr_cl_26_195 ==
 747                         bw_ext_csd[EXT_CSD_PWR_CL_26_195]) &&
 748                 (card->ext_csd.raw_pwr_cl_52_360 ==
 749                         bw_ext_csd[EXT_CSD_PWR_CL_52_360]) &&
 750                 (card->ext_csd.raw_pwr_cl_26_360 ==
 751                         bw_ext_csd[EXT_CSD_PWR_CL_26_360]) &&
 752                 (card->ext_csd.raw_pwr_cl_200_195 ==
 753                         bw_ext_csd[EXT_CSD_PWR_CL_200_195]) &&
 754                 (card->ext_csd.raw_pwr_cl_200_360 ==
 755                         bw_ext_csd[EXT_CSD_PWR_CL_200_360]) &&
 756                 (card->ext_csd.raw_pwr_cl_ddr_52_195 ==
 757                         bw_ext_csd[EXT_CSD_PWR_CL_DDR_52_195]) &&
 758                 (card->ext_csd.raw_pwr_cl_ddr_52_360 ==
 759                         bw_ext_csd[EXT_CSD_PWR_CL_DDR_52_360]) &&
 760                 (card->ext_csd.raw_pwr_cl_ddr_200_360 ==
 761                         bw_ext_csd[EXT_CSD_PWR_CL_DDR_200_360]));
 762
 763         if (err)
 764                 err = -EINVAL;
 765
 766         kfree(bw_ext_csd);
 767         return err;
 768 }
 769
 770 MMC_DEV_ATTR(cid, "%08x%08x%08x%08x\n", card->raw_cid[0], card->raw_cid[1],
 771         card->raw_cid[2], card->raw_cid[3]);
 772 MMC_DEV_ATTR(csd, "%08x%08x%08x%08x\n", card->raw_csd[0], card->raw_csd[1],
 773         card->raw_csd[2], card->raw_csd[3]);
 774 MMC_DEV_ATTR(date, "%02d/%04d\n", card->cid.month, card->cid.year);
 775 MMC_DEV_ATTR(erase_size, "%u\n", card->erase_size << 9);
 776 MMC_DEV_ATTR(preferred_erase_size, "%u\n", card->pref_erase << 9);
 777 MMC_DEV_ATTR(ffu_capable, "%d\n", card->ext_csd.ffu_capable);
 778 MMC_DEV_ATTR(hwrev, "0x%x\n", card->cid.hwrev);
 779 MMC_DEV_ATTR(manfid, "0x%06x\n", card->cid.manfid);
 780 MMC_DEV_ATTR(name, "%s\n", card->cid.prod_name);
 781 MMC_DEV_ATTR(oemid, "0x%04x\n", card->cid.oemid);
 782 MMC_DEV_ATTR(prv, "0x%x\n", card->cid.prv);
 783 MMC_DEV_ATTR(rev, "0x%x\n", card->ext_csd.rev);
 784 MMC_DEV_ATTR(pre_eol_info, "0x%02x\n", card->ext_csd.pre_eol_info);
 785 MMC_DEV_ATTR(life_time, "0x%02x 0x%02x\n",
 786         card->ext_csd.device_life_time_est_typ_a,
 787         card->ext_csd.device_life_time_est_typ_b);
 788 MMC_DEV_ATTR(serial, "0x%08x\n", card->cid.serial);
 789 MMC_DEV_ATTR(enhanced_area_offset, "%llu\n",
 790                 card->ext_csd.enhanced_area_offset);
 791 MMC_DEV_ATTR(enhanced_area_size, "%u\n", card->ext_csd.enhanced_area_size);
 792 MMC_DEV_ATTR(raw_rpmb_size_mult, "%#x\n", card->ext_csd.raw_rpmb_size_mult);
 793 MMC_DEV_ATTR(rel_sectors, "%#x\n", card->ext_csd.rel_sectors);
 794 MMC_DEV_ATTR(ocr, "0x%08x\n", card->ocr);
 795 MMC_DEV_ATTR(rca, "0x%04x\n", card->rca);
 796 MMC_DEV_ATTR(cmdq_en, "%d\n", card->ext_csd.cmdq_en);
 797
 798 static ssize_t mmc_fwrev_show(struct device *dev,
 799                               struct device_attribute *attr,
 800                               char *buf)
 801 {
 802         struct mmc_card *card = mmc_dev_to_card(dev);
 803
 804         if (card->ext_csd.rev < 7) {
 805                 return sprintf(buf, "0x%x\n", card->cid.fwrev);
 806         } else {
 807                 return sprintf(buf, "0x%*phN\n", MMC_FIRMWARE_LEN,
 808                                card->ext_csd.fwrev);
 809         }
 810 }
 811
 812 static DEVICE_ATTR(fwrev, S_IRUGO, mmc_fwrev_show, NULL);
 813
 814 static ssize_t mmc_dsr_show(struct device *dev,
 815                             struct device_attribute *attr,
 816                             char *buf)
 817 {
 818         struct mmc_card *card = mmc_dev_to_card(dev);
 819         struct mmc_host *host = card->host;
 820
 821         if (card->csd.dsr_imp && host->dsr_req)
 822                 return sprintf(buf, "0x%x\n", host->dsr);
 823         else
 824                 /* return default DSR value */
 825                 return sprintf(buf, "0x%x\n", 0x404);
 826 }
 827
 828 static DEVICE_ATTR(dsr, S_IRUGO, mmc_dsr_show, NULL);
 829
 830 static struct attribute *mmc_std_attrs[] = {
 831         &dev_attr_cid.attr,
 832         &dev_attr_csd.attr,
 833         &dev_attr_date.attr,
 834         &dev_attr_erase_size.attr,
 835         &dev_attr_preferred_erase_size.attr,
 836         &dev_attr_fwrev.attr,
 837         &dev_attr_ffu_capable.attr,
 838         &dev_attr_hwrev.attr,
 839         &dev_attr_manfid.attr,
 840         &dev_attr_name.attr,
 841         &dev_attr_oemid.attr,
 842         &dev_attr_prv.attr,
 843         &dev_attr_rev.attr,
 844         &dev_attr_pre_eol_info.attr,
 845         &dev_attr_life_time.attr,
 846         &dev_attr_serial.attr,
 847         &dev_attr_enhanced_area_offset.attr,
 848         &dev_attr_enhanced_area_size.attr,
 849         &dev_attr_raw_rpmb_size_mult.attr,
 850         &dev_attr_rel_sectors.attr,
 851         &dev_attr_ocr.attr,
 852         &dev_attr_rca.attr,
 853         &dev_attr_dsr.attr,
 854         &dev_attr_cmdq_en.attr,
 855         NULL,
 856 };
 857 ATTRIBUTE_GROUPS(mmc_std);
 858
 859 static struct device_type mmc_type = {
 860         .groups = mmc_std_groups,
 861 };
 862
 863 /*
 864  * Select the PowerClass for the current bus width
 865  * If power class is defined for 4/8 bit bus in the
 866  * extended CSD register, select it by executing the
 867  * mmc_switch command.
 868  */
 869 static int __mmc_select_powerclass(struct mmc_card *card,
 870                                    unsigned int bus_width)
 871 {
 872         struct mmc_host *host = card->host;
 873         struct mmc_ext_csd *ext_csd = &card->ext_csd;
 874         unsigned int pwrclass_val = 0;
 875         int err = 0;
 876
 877         switch (1 << host->ios.vdd) {
 878         case MMC_VDD_165_195:
 879                 if (host->ios.clock <= MMC_HIGH_26_MAX_DTR)
 880                         pwrclass_val = ext_csd->raw_pwr_cl_26_195;
 881                 else if (host->ios.clock <= MMC_HIGH_52_MAX_DTR)
 882                         pwrclass_val = (bus_width <= EXT_CSD_BUS_WIDTH_8) ?
 883                                 ext_csd->raw_pwr_cl_52_195 :
 884                                 ext_csd->raw_pwr_cl_ddr_52_195;
 885                 else if (host->ios.clock <= MMC_HS200_MAX_DTR)
 886                         pwrclass_val = ext_csd->raw_pwr_cl_200_195;
 887                 break;
 888         case MMC_VDD_27_28:
 889         case MMC_VDD_28_29:
 890         case MMC_VDD_29_30:
 891         case MMC_VDD_30_31:
 892         case MMC_VDD_31_32:
 893         case MMC_VDD_32_33:
 894         case MMC_VDD_33_34:
 895         case MMC_VDD_34_35:
 896         case MMC_VDD_35_36:
 897                 if (host->ios.clock <= MMC_HIGH_26_MAX_DTR)
 898                         pwrclass_val = ext_csd->raw_pwr_cl_26_360;
 899                 else if (host->ios.clock <= MMC_HIGH_52_MAX_DTR)
 900                         pwrclass_val = (bus_width <= EXT_CSD_BUS_WIDTH_8) ?
 901                                 ext_csd->raw_pwr_cl_52_360 :
 902                                 ext_csd->raw_pwr_cl_ddr_52_360;
 903                 else if (host->ios.clock <= MMC_HS200_MAX_DTR)
 904                         pwrclass_val = (bus_width == EXT_CSD_DDR_BUS_WIDTH_8) ?
 905                                 ext_csd->raw_pwr_cl_ddr_200_360 :
 906                                 ext_csd->raw_pwr_cl_200_360;
 907                 break;
 908         default:
 909                 pr_warn("%s: Voltage range not supported for power class\n",
 910                         mmc_hostname(host));
 911                 return -EINVAL;
 912         }
 913
 914         if (bus_width & (EXT_CSD_BUS_WIDTH_8 | EXT_CSD_DDR_BUS_WIDTH_8))
 915                 pwrclass_val = (pwrclass_val & EXT_CSD_PWR_CL_8BIT_MASK) >>
 916                                 EXT_CSD_PWR_CL_8BIT_SHIFT;
 917         else
 918                 pwrclass_val = (pwrclass_val & EXT_CSD_PWR_CL_4BIT_MASK) >>
 919                                 EXT_CSD_PWR_CL_4BIT_SHIFT;
 920
 921         /* If the power class is different from the default value */
 922         if (pwrclass_val > 0) {
 923                 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
 924                                  EXT_CSD_POWER_CLASS,
 925                                  pwrclass_val,
 926                                  card->ext_csd.generic_cmd6_time);
 927         }
 928
 929         return err;
 930 }
 931
 932 static int mmc_select_powerclass(struct mmc_card *card)
 933 {
 934         struct mmc_host *host = card->host;
 935         u32 bus_width, ext_csd_bits;
 936         int err, ddr;
 937
 938         /* Power class selection is supported for versions >= 4.0 */
 939         if (!mmc_can_ext_csd(card))
 940                 return 0;
 941
 942         bus_width = host->ios.bus_width;
 943         /* Power class values are defined only for 4/8 bit bus */
 944         if (bus_width == MMC_BUS_WIDTH_1)
 945                 return 0;
 946
 947         ddr = card->mmc_avail_type & EXT_CSD_CARD_TYPE_DDR_52;
 948         if (ddr)
 949                 ext_csd_bits = (bus_width == MMC_BUS_WIDTH_8) ?
 950                         EXT_CSD_DDR_BUS_WIDTH_8 : EXT_CSD_DDR_BUS_WIDTH_4;
 951         else
 952                 ext_csd_bits = (bus_width == MMC_BUS_WIDTH_8) ?
 953                         EXT_CSD_BUS_WIDTH_8 :  EXT_CSD_BUS_WIDTH_4;
 954
 955         err = __mmc_select_powerclass(card, ext_csd_bits);
 956         if (err)
 957                 pr_warn("%s: power class selection to bus width %d ddr %d failed\n",
 958                         mmc_hostname(host), 1 << bus_width, ddr);
 959
 960         return err;
 961 }
 962
 963 /*
 964  * Set the bus speed for the selected speed mode.
 965  */
 966 static void mmc_set_bus_speed(struct mmc_card *card)
 967 {
 968         unsigned int max_dtr = (unsigned int)-1;
 969
 970         if ((mmc_card_hs200(card) || mmc_card_hs400(card)) &&
 971              max_dtr > card->ext_csd.hs200_max_dtr)
 972                 max_dtr = card->ext_csd.hs200_max_dtr;
 973         else if (mmc_card_hs(card) && max_dtr > card->ext_csd.hs_max_dtr)
 974                 max_dtr = card->ext_csd.hs_max_dtr;
 975         else if (max_dtr > card->csd.max_dtr)
 976                 max_dtr = card->csd.max_dtr;
 977
 978         mmc_set_clock(card->host, max_dtr);
 979 }
 980
 981 /*
 982  * Select the bus width amoung 4-bit and 8-bit(SDR).
 983  * If the bus width is changed successfully, return the selected width value.
 984  * Zero is returned instead of error value if the wide width is not supported.
 985  */
 986 static int mmc_select_bus_width(struct mmc_card *card)
 987 {
 988         static unsigned ext_csd_bits[] = {
 989                 EXT_CSD_BUS_WIDTH_8,
 990                 EXT_CSD_BUS_WIDTH_4,
 991         };
 992         static unsigned bus_widths[] = {
 993                 MMC_BUS_WIDTH_8,
 994                 MMC_BUS_WIDTH_4,
 995         };
 996         struct mmc_host *host = card->host;
 997         unsigned idx, bus_width = 0;
 998         int err = 0;
 999
1000         if (!mmc_can_ext_csd(card) ||
1001             !(host->caps & (MMC_CAP_4_BIT_DATA | MMC_CAP_8_BIT_DATA)))
1002                 return 0;
1003
1004         idx = (host->caps & MMC_CAP_8_BIT_DATA) ? 0 : 1;
1005
1006         /*
1007          * Unlike SD, MMC cards dont have a configuration register to notify
1008          * supported bus width. So bus test command should be run to identify
1009          * the supported bus width or compare the ext csd values of current
1010          * bus width and ext csd values of 1 bit mode read earlier.
1011          */
1012         for (; idx < ARRAY_SIZE(bus_widths); idx++) {
1013                 /*
1014                  * Host is capable of 8bit transfer, then switch
1015                  * the device to work in 8bit transfer mode. If the
1016                  * mmc switch command returns error then switch to
1017                  * 4bit transfer mode. On success set the corresponding
1018                  * bus width on the host.
1019                  */
1020                 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
1021                                  EXT_CSD_BUS_WIDTH,
1022                                  ext_csd_bits[idx],
1023                                  card->ext_csd.generic_cmd6_time);
1024                 if (err)
1025                         continue;
1026
1027                 bus_width = bus_widths[idx];
1028                 mmc_set_bus_width(host, bus_width);
1029
1030                 /*
1031                  * If controller can't handle bus width test,
1032                  * compare ext_csd previously read in 1 bit mode
1033                  * against ext_csd at new bus width
1034                  */
1035                 if (!(host->caps & MMC_CAP_BUS_WIDTH_TEST))
1036                         err = mmc_compare_ext_csds(card, bus_width);
1037                 else
1038                         err = mmc_bus_test(card, bus_width);
1039
1040                 if (!err) {
1041                         err = bus_width;
1042                         break;
1043                 } else {
1044                         pr_warn("%s: switch to bus width %d failed\n",
1045                                 mmc_hostname(host), 1 << bus_width);
1046                 }
1047         }
1048
1049         return err;
1050 }
1051
1052 /*
1053  * Switch to the high-speed mode
1054  */
1055 static int mmc_select_hs(struct mmc_card *card)
1056 {
1057         int err;
1058
1059         err = __mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
1060                            EXT_CSD_HS_TIMING, EXT_CSD_TIMING_HS,
1061                            card->ext_csd.generic_cmd6_time, MMC_TIMING_MMC_HS,
1062                            true, true, true);
1063         if (err)
1064                 pr_warn("%s: switch to high-speed failed, err:%d\n",
1065                         mmc_hostname(card->host), err);
1066
1067         return err;
1068 }
1069
1070 /*
1071  * Activate wide bus and DDR if supported.
1072  */
1073 static int mmc_select_hs_ddr(struct mmc_card *card)
1074 {
1075         struct mmc_host *host = card->host;
1076         u32 bus_width, ext_csd_bits;
1077         int err = 0;
1078
1079         if (!(card->mmc_avail_type & EXT_CSD_CARD_TYPE_DDR_52))
1080                 return 0;
1081
1082         bus_width = host->ios.bus_width;
1083         if (bus_width == MMC_BUS_WIDTH_1)
1084                 return 0;
1085
1086         ext_csd_bits = (bus_width == MMC_BUS_WIDTH_8) ?
1087                 EXT_CSD_DDR_BUS_WIDTH_8 : EXT_CSD_DDR_BUS_WIDTH_4;
1088
1089         err = __mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
1090                            EXT_CSD_BUS_WIDTH,
1091                            ext_csd_bits,
1092                            card->ext_csd.generic_cmd6_time,
1093                            MMC_TIMING_MMC_DDR52,
1094                            true, true, true);
1095         if (err) {
1096                 pr_err("%s: switch to bus width %d ddr failed\n",
1097                         mmc_hostname(host), 1 << bus_width);
1098                 return err;
1099         }
1100
1101         /*
1102          * eMMC cards can support 3.3V to 1.2V i/o (vccq)
1103          * signaling.
1104          *
1105          * EXT_CSD_CARD_TYPE_DDR_1_8V means 3.3V or 1.8V vccq.
1106          *
1107          * 1.8V vccq at 3.3V core voltage (vcc) is not required
1108          * in the JEDEC spec for DDR.
1109          *
1110          * Even (e)MMC card can support 3.3v to 1.2v vccq, but not all
1111          * host controller can support this, like some of the SDHCI
1112          * controller which connect to an eMMC device. Some of these
1113          * host controller still needs to use 1.8v vccq for supporting
1114          * DDR mode.
1115          *
1116          * So the sequence will be:
1117          * if (host and device can both support 1.2v IO)
1118          *      use 1.2v IO;
1119          * else if (host and device can both support 1.8v IO)
1120          *      use 1.8v IO;
1121          * so if host and device can only support 3.3v IO, this is the
1122          * last choice.
1123          *
1124          * WARNING: eMMC rules are NOT the same as SD DDR
1125          */
1126         if (card->mmc_avail_type & EXT_CSD_CARD_TYPE_DDR_1_2V) {
1127                 err = mmc_set_signal_voltage(host, MMC_SIGNAL_VOLTAGE_120);
1128                 if (!err)
1129                         return 0;
1130         }
1131
1132         if (card->mmc_avail_type & EXT_CSD_CARD_TYPE_DDR_1_8V &&
1133             host->caps & MMC_CAP_1_8V_DDR)
1134                 err = mmc_set_signal_voltage(host, MMC_SIGNAL_VOLTAGE_180);
1135
1136         /* make sure vccq is 3.3v after switching disaster */
1137         if (err)
1138                 err = mmc_set_signal_voltage(host, MMC_SIGNAL_VOLTAGE_330);
1139
1140         return err;
1141 }
1142
1143 static int mmc_select_hs400(struct mmc_card *card)
1144 {
1145         struct mmc_host *host = card->host;
1146         unsigned int max_dtr;
1147         int err = 0;
1148         u8 val;
1149
1150         /*
1151          * HS400 mode requires 8-bit bus width
1152          */
1153         if (!(card->mmc_avail_type & EXT_CSD_CARD_TYPE_HS400 &&
1154               host->ios.bus_width == MMC_BUS_WIDTH_8))
1155                 return 0;
1156
1157         /* Switch card to HS mode */
1158         val = EXT_CSD_TIMING_HS;
1159         err = __mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
1160                            EXT_CSD_HS_TIMING, val,
1161                            card->ext_csd.generic_cmd6_time, 0,
1162                            true, false, true);
1163         if (err) {
1164                 pr_err("%s: switch to high-speed from hs200 failed, err:%d\n",
1165                         mmc_hostname(host), err);
1166                 return err;
1167         }
1168
1169         /* Set host controller to HS timing */
1170         mmc_set_timing(card->host, MMC_TIMING_MMC_HS);
1171
1172         /* Reduce frequency to HS frequency */
1173         max_dtr = card->ext_csd.hs_max_dtr;
1174         mmc_set_clock(host, max_dtr);
1175
1176         err = mmc_switch_status(card);
1177         if (err)
1178                 goto out_err;
1179
1180         /* Switch card to DDR */
1181         err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
1182                          EXT_CSD_BUS_WIDTH,
1183                          EXT_CSD_DDR_BUS_WIDTH_8,
1184                          card->ext_csd.generic_cmd6_time);
1185         if (err) {
1186                 pr_err("%s: switch to bus width for hs400 failed, err:%d\n",
1187                         mmc_hostname(host), err);
1188                 return err;
1189         }
1190
1191         /* Switch card to HS400 */
1192         val = EXT_CSD_TIMING_HS400 |
1193               card->drive_strength << EXT_CSD_DRV_STR_SHIFT;
1194         err = __mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
1195                            EXT_CSD_HS_TIMING, val,
1196                            card->ext_csd.generic_cmd6_time, 0,
1197                            true, false, true);
1198         if (err) {
1199                 pr_err("%s: switch to hs400 failed, err:%d\n",
1200                          mmc_hostname(host), err);
1201                 return err;
1202         }
1203
1204         /* Set host controller to HS400 timing and frequency */
1205         mmc_set_timing(host, MMC_TIMING_MMC_HS400);
1206         mmc_set_bus_speed(card);
1207
1208         err = mmc_switch_status(card);
1209         if (err)
1210                 goto out_err;
1211
1212         return 0;
1213
1214 out_err:
1215         pr_err("%s: %s failed, error %d\n", mmc_hostname(card->host),
1216                __func__, err);
1217         return err;
1218 }
1219
1220 int mmc_hs200_to_hs400(struct mmc_card *card)
1221 {
1222         return mmc_select_hs400(card);
1223 }
1224
1225 int mmc_hs400_to_hs200(struct mmc_card *card)
1226 {
1227         struct mmc_host *host = card->host;
1228         unsigned int max_dtr;
1229         int err;
1230         u8 val;
1231
1232         /* Reduce frequency to HS */
1233         max_dtr = card->ext_csd.hs_max_dtr;
1234         mmc_set_clock(host, max_dtr);
1235
1236         /* Switch HS400 to HS DDR */
1237         val = EXT_CSD_TIMING_HS;
1238         err = __mmc_switch(card, EXT_CSD_CMD_SET_NORMAL, EXT_CSD_HS_TIMING,
1239                            val, card->ext_csd.generic_cmd6_time, 0,
1240                            true, false, true);
1241         if (err)
1242                 goto out_err;
1243
1244         mmc_set_timing(host, MMC_TIMING_MMC_DDR52);
1245
1246         err = mmc_switch_status(card);
1247         if (err)
1248                 goto out_err;
1249
1250         /* Switch HS DDR to HS */
1251         err = __mmc_switch(card, EXT_CSD_CMD_SET_NORMAL, EXT_CSD_BUS_WIDTH,
1252                            EXT_CSD_BUS_WIDTH_8, card->ext_csd.generic_cmd6_time,
1253                            0, true, false, true);
1254         if (err)
1255                 goto out_err;
1256
1257         mmc_set_timing(host, MMC_TIMING_MMC_HS);
1258
1259         err = mmc_switch_status(card);
1260         if (err)
1261                 goto out_err;
1262
1263         /* Switch HS to HS200 */
1264         val = EXT_CSD_TIMING_HS200 |
1265               card->drive_strength << EXT_CSD_DRV_STR_SHIFT;
1266         err = __mmc_switch(card, EXT_CSD_CMD_SET_NORMAL, EXT_CSD_HS_TIMING,
1267                            val, card->ext_csd.generic_cmd6_time, 0,
1268                            true, false, true);
1269         if (err)
1270                 goto out_err;
1271
1272         mmc_set_timing(host, MMC_TIMING_MMC_HS200);
1273
1274         /*
1275          * For HS200, CRC errors are not a reliable way to know the switch
1276          * failed. If there really is a problem, we would expect tuning will
1277          * fail and the result ends up the same.
1278          */
1279         err = __mmc_switch_status(card, false);
1280         if (err)
1281                 goto out_err;
1282
1283         mmc_set_bus_speed(card);
1284
1285         return 0;
1286
1287 out_err:
1288         pr_err("%s: %s failed, error %d\n", mmc_hostname(card->host),
1289                __func__, err);
1290         return err;
1291 }
1292
1293 static void mmc_select_driver_type(struct mmc_card *card)
1294 {
1295         int card_drv_type, drive_strength, drv_type = 0;
1296         int fixed_drv_type = card->host->fixed_drv_type;
1297
1298         card_drv_type = card->ext_csd.raw_driver_strength |
1299                         mmc_driver_type_mask(0);
1300
1301         if (fixed_drv_type >= 0)
1302                 drive_strength = card_drv_type & mmc_driver_type_mask(fixed_drv_type)
1303                                  ? fixed_drv_type : 0;
1304         else
1305                 drive_strength = mmc_select_drive_strength(card,
1306                                                            card->ext_csd.hs200_max_dtr,
1307                                                            card_drv_type, &drv_type);
1308
1309         card->drive_strength = drive_strength;
1310
1311         if (drv_type)
1312                 mmc_set_driver_type(card->host, drv_type);
1313 }
1314
1315 static int mmc_select_hs400es(struct mmc_card *card)
1316 {
1317         struct mmc_host *host = card->host;
1318         int err = -EINVAL;
1319         u8 val;
1320
1321         if (!(host->caps & MMC_CAP_8_BIT_DATA)) {
1322                 err = -ENOTSUPP;
1323                 goto out_err;
1324         }
1325
1326         if (card->mmc_avail_type & EXT_CSD_CARD_TYPE_HS400_1_2V)
1327                 err = mmc_set_signal_voltage(host, MMC_SIGNAL_VOLTAGE_120);
1328
1329         if (err && card->mmc_avail_type & EXT_CSD_CARD_TYPE_HS400_1_8V)
1330                 err = mmc_set_signal_voltage(host, MMC_SIGNAL_VOLTAGE_180);
1331
1332         /* If fails try again during next card power cycle */
1333         if (err)
1334                 goto out_err;
1335
1336         err = mmc_select_bus_width(card);
1337         if (err < 0)
1338                 goto out_err;
1339
1340         /* Switch card to HS mode */
1341         err = __mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
1342                            EXT_CSD_HS_TIMING, EXT_CSD_TIMING_HS,
1343                            card->ext_csd.generic_cmd6_time, 0,
1344                            true, false, true);
1345         if (err) {
1346                 pr_err("%s: switch to hs for hs400es failed, err:%d\n",
1347                         mmc_hostname(host), err);
1348                 goto out_err;
1349         }
1350
1351         mmc_set_timing(host, MMC_TIMING_MMC_HS);
1352         err = mmc_switch_status(card);
1353         if (err)
1354                 goto out_err;
1355
1356         mmc_set_clock(host, card->ext_csd.hs_max_dtr);
1357
1358         /* Switch card to DDR with strobe bit */
1359         val = EXT_CSD_DDR_BUS_WIDTH_8 | EXT_CSD_BUS_WIDTH_STROBE;
1360         err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
1361                          EXT_CSD_BUS_WIDTH,
1362                          val,
1363                          card->ext_csd.generic_cmd6_time);
1364         if (err) {
1365                 pr_err("%s: switch to bus width for hs400es failed, err:%d\n",
1366                         mmc_hostname(host), err);
1367                 goto out_err;
1368         }
1369
1370         mmc_select_driver_type(card);
1371
1372         /* Switch card to HS400 */
1373         val = EXT_CSD_TIMING_HS400 |
1374               card->drive_strength << EXT_CSD_DRV_STR_SHIFT;
1375         err = __mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
1376                            EXT_CSD_HS_TIMING, val,
1377                            card->ext_csd.generic_cmd6_time, 0,
1378                            true, false, true);
1379         if (err) {
1380                 pr_err("%s: switch to hs400es failed, err:%d\n",
1381                         mmc_hostname(host), err);
1382                 goto out_err;
1383         }
1384
1385         /* Set host controller to HS400 timing and frequency */
1386         mmc_set_timing(host, MMC_TIMING_MMC_HS400);
1387
1388         /* Controller enable enhanced strobe function */
1389         host->ios.enhanced_strobe = true;
1390         if (host->ops->hs400_enhanced_strobe)
1391                 host->ops->hs400_enhanced_strobe(host, &host->ios);
1392
1393         err = mmc_switch_status(card);
1394         if (err)
1395                 goto out_err;
1396
1397         return 0;
1398
1399 out_err:
1400         pr_err("%s: %s failed, error %d\n", mmc_hostname(card->host),
1401                __func__, err);
1402         return err;
1403 }
1404
1405 /*
1406  * For device supporting HS200 mode, the following sequence
1407  * should be done before executing the tuning process.
1408  * 1. set the desired bus width(4-bit or 8-bit, 1-bit is not supported)
1409  * 2. switch to HS200 mode
1410  * 3. set the clock to > 52Mhz and <=200MHz
1411  */
1412 static int mmc_select_hs200(struct mmc_card *card)
1413 {
1414         struct mmc_host *host = card->host;
1415         unsigned int old_timing, old_signal_voltage;
1416         int err = -EINVAL;
1417         u8 val;
1418
1419         old_signal_voltage = host->ios.signal_voltage;
1420         if (card->mmc_avail_type & EXT_CSD_CARD_TYPE_HS200_1_2V)
1421                 err = mmc_set_signal_voltage(host, MMC_SIGNAL_VOLTAGE_120);
1422
1423         if (err && card->mmc_avail_type & EXT_CSD_CARD_TYPE_HS200_1_8V)
1424                 err = mmc_set_signal_voltage(host, MMC_SIGNAL_VOLTAGE_180);
1425
1426         /* If fails try again during next card power cycle */
1427         if (err)
1428                 return err;
1429
1430         mmc_select_driver_type(card);
1431
1432         /*
1433          * Set the bus width(4 or 8) with host's support and
1434          * switch to HS200 mode if bus width is set successfully.
1435          */
1436         err = mmc_select_bus_width(card);
1437         if (err > 0) {
1438                 val = EXT_CSD_TIMING_HS200 |
1439                       card->drive_strength << EXT_CSD_DRV_STR_SHIFT;
1440                 err = __mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
1441                                    EXT_CSD_HS_TIMING, val,
1442                                    card->ext_csd.generic_cmd6_time, 0,
1443                                    true, false, true);
1444                 if (err)
1445                         goto err;
1446                 old_timing = host->ios.timing;
1447                 mmc_set_timing(host, MMC_TIMING_MMC_HS200);
1448
1449                 /*
1450                  * For HS200, CRC errors are not a reliable way to know the
1451                  * switch failed. If there really is a problem, we would expect
1452                  * tuning will fail and the result ends up the same.
1453                  */
1454                 err = __mmc_switch_status(card, false);
1455
1456                 /*
1457                  * mmc_select_timing() assumes timing has not changed if
1458                  * it is a switch error.
1459                  */
1460                 if (err == -EBADMSG)
1461                         mmc_set_timing(host, old_timing);
1462         }
1463 err:
1464         if (err) {
1465                 /* fall back to the old signal voltage, if fails report error */
1466                 if (mmc_set_signal_voltage(host, old_signal_voltage))
1467                         err = -EIO;
1468
1469                 pr_err("%s: %s failed, error %d\n", mmc_hostname(card->host),
1470                        __func__, err);
1471         }
1472         return err;
1473 }
1474
1475 /*
1476  * Activate High Speed, HS200 or HS400ES mode if supported.
1477  */
1478 static int mmc_select_timing(struct mmc_card *card)
1479 {
1480         int err = 0;
1481
1482         if (!mmc_can_ext_csd(card))
1483                 goto bus_speed;
1484
1485         if (card->mmc_avail_type & EXT_CSD_CARD_TYPE_HS400ES)
1486                 err = mmc_select_hs400es(card);
1487         else if (card->mmc_avail_type & EXT_CSD_CARD_TYPE_HS200)
1488                 err = mmc_select_hs200(card);
1489         else if (card->mmc_avail_type & EXT_CSD_CARD_TYPE_HS)
1490                 err = mmc_select_hs(card);
1491
1492         if (err && err != -EBADMSG)
1493                 return err;
1494
1495 bus_speed:
1496         /*
1497          * Set the bus speed to the selected bus timing.
1498          * If timing is not selected, backward compatible is the default.
1499          */
1500         mmc_set_bus_speed(card);
1501         return 0;
1502 }
1503
1504 /*
1505  * Execute tuning sequence to seek the proper bus operating
1506  * conditions for HS200 and HS400, which sends CMD21 to the device.
1507  */
1508 static int mmc_hs200_tuning(struct mmc_card *card)
1509 {
1510         struct mmc_host *host = card->host;
1511
1512         /*
1513          * Timing should be adjusted to the HS400 target
1514          * operation frequency for tuning process
1515          */
1516         if (card->mmc_avail_type & EXT_CSD_CARD_TYPE_HS400 &&
1517             host->ios.bus_width == MMC_BUS_WIDTH_8)
1518                 if (host->ops->prepare_hs400_tuning)
1519                         host->ops->prepare_hs400_tuning(host, &host->ios);
1520
1521         return mmc_execute_tuning(card);
1522 }
1523
1524 /*
1525  * Handle the detection and initialisation of a card.
1526  *
1527  * In the case of a resume, "oldcard" will contain the card
1528  * we're trying to reinitialise.
1529  */
1530 static int mmc_init_card(struct mmc_host *host, u32 ocr,
1531         struct mmc_card *oldcard)
1532 {
1533         struct mmc_card *card;
1534         int err;
1535         u32 cid[4];
1536         u32 rocr;
1537
1538         WARN_ON(!host->claimed);
1539
1540         /* Set correct bus mode for MMC before attempting init */
1541         if (!mmc_host_is_spi(host))
1542                 mmc_set_bus_mode(host, MMC_BUSMODE_OPENDRAIN);
1543
1544         /*
1545          * Since we're changing the OCR value, we seem to
1546          * need to tell some cards to go back to the idle
1547          * state.  We wait 1ms to give cards time to
1548          * respond.
1549          * mmc_go_idle is needed for eMMC that are asleep
1550          */
1551         mmc_go_idle(host);
1552
1553         /* The extra bit indicates that we support high capacity */
1554         err = mmc_send_op_cond(host, ocr | (1 << 30), &rocr);
1555         if (err)
1556                 goto err;
1557
1558         /*
1559          * For SPI, enable CRC as appropriate.
1560          */
1561         if (mmc_host_is_spi(host)) {
1562                 err = mmc_spi_set_crc(host, use_spi_crc);
1563                 if (err)
1564                         goto err;
1565         }
1566
1567         /*
1568          * Fetch CID from card.
1569          */
1570         err = mmc_send_cid(host, cid);
1571         if (err)
1572                 goto err;
1573
1574         if (oldcard) {
1575                 if (memcmp(cid, oldcard->raw_cid, sizeof(cid)) != 0) {
1576                         err = -ENOENT;
1577                         goto err;
1578                 }
1579
1580                 card = oldcard;
1581         } else {
1582                 /*
1583                  * Allocate card structure.
1584                  */
1585                 card = mmc_alloc_card(host, &mmc_type);
1586                 if (IS_ERR(card)) {
1587                         err = PTR_ERR(card);
1588                         goto err;
1589                 }
1590
1591                 card->ocr = ocr;
1592                 card->type = MMC_TYPE_MMC;
1593                 card->rca = 1;
1594                 memcpy(card->raw_cid, cid, sizeof(card->raw_cid));
1595         }
1596
1597         /*
1598          * Call the optional HC's init_card function to handle quirks.
1599          */
1600         if (host->ops->init_card)
1601                 host->ops->init_card(host, card);
1602
1603         /*
1604          * For native busses:  set card RCA and quit open drain mode.
1605          */
1606         if (!mmc_host_is_spi(host)) {
1607                 err = mmc_set_relative_addr(card);
1608                 if (err)
1609                         goto free_card;
1610
1611                 mmc_set_bus_mode(host, MMC_BUSMODE_PUSHPULL);
1612         }
1613
1614         if (!oldcard) {
1615                 /*
1616                  * Fetch CSD from card.
1617                  */
1618                 err = mmc_send_csd(card, card->raw_csd);
1619                 if (err)
1620                         goto free_card;
1621
1622                 err = mmc_decode_csd(card);
1623                 if (err)
1624                         goto free_card;
1625                 err = mmc_decode_cid(card);
1626                 if (err)
1627                         goto free_card;
1628         }
1629
1630         /*
1631          * handling only for cards supporting DSR and hosts requesting
1632          * DSR configuration
1633          */
1634         if (card->csd.dsr_imp && host->dsr_req)
1635                 mmc_set_dsr(host);
1636
1637         /*
1638          * Select card, as all following commands rely on that.
1639          */
1640         if (!mmc_host_is_spi(host)) {
1641                 err = mmc_select_card(card);
1642                 if (err)
1643                         goto free_card;
1644         }
1645
1646         if (!oldcard) {
1647                 /* Read extended CSD. */
1648                 err = mmc_read_ext_csd(card);
1649                 if (err)
1650                         goto free_card;
1651
1652                 /*
1653                  * If doing byte addressing, check if required to do sector
1654                  * addressing.  Handle the case of <2GB cards needing sector
1655                  * addressing.  See section 8.1 JEDEC Standard JED84-A441;
1656                  * ocr register has bit 30 set for sector addressing.
1657                  */
1658                 if (rocr & BIT(30))
1659                         mmc_card_set_blockaddr(card);
1660
1661                 /* Erase size depends on CSD and Extended CSD */
1662                 mmc_set_erase_size(card);
1663         }
1664
1665         /* Enable ERASE_GRP_DEF. This bit is lost after a reset or power off. */
1666         if (card->ext_csd.rev >= 3) {
1667                 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
1668                                  EXT_CSD_ERASE_GROUP_DEF, 1,
1669                                  card->ext_csd.generic_cmd6_time);
1670
1671                 if (err && err != -EBADMSG)
1672                         goto free_card;
1673
1674                 if (err) {
1675                         err = 0;
1676                         /*
1677                          * Just disable enhanced area off & sz
1678                          * will try to enable ERASE_GROUP_DEF
1679                          * during next time reinit
1680                          */
1681                         card->ext_csd.enhanced_area_offset = -EINVAL;
1682                         card->ext_csd.enhanced_area_size = -EINVAL;
1683                 } else {
1684                         card->ext_csd.erase_group_def = 1;
1685                         /*
1686                          * enable ERASE_GRP_DEF successfully.
1687                          * This will affect the erase size, so
1688                          * here need to reset erase size
1689                          */
1690                         mmc_set_erase_size(card);
1691                 }
1692         }
1693
1694         /*
1695          * Ensure eMMC user default partition is enabled
1696          */
1697         if (card->ext_csd.part_config & EXT_CSD_PART_CONFIG_ACC_MASK) {
1698                 card->ext_csd.part_config &= ~EXT_CSD_PART_CONFIG_ACC_MASK;
1699                 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL, EXT_CSD_PART_CONFIG,
1700                                  card->ext_csd.part_config,
1701                                  card->ext_csd.part_time);
1702                 if (err && err != -EBADMSG)
1703                         goto free_card;
1704         }
1705
1706         /*
1707          * Enable power_off_notification byte in the ext_csd register
1708          */
1709         if (card->ext_csd.rev >= 6) {
1710                 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
1711                                  EXT_CSD_POWER_OFF_NOTIFICATION,
1712                                  EXT_CSD_POWER_ON,
1713                                  card->ext_csd.generic_cmd6_time);
1714                 if (err && err != -EBADMSG)
1715                         goto free_card;
1716
1717                 /*
1718                  * The err can be -EBADMSG or 0,
1719                  * so check for success and update the flag
1720                  */
1721                 if (!err)
1722                         card->ext_csd.power_off_notification = EXT_CSD_POWER_ON;
1723         }
1724
1725         /*
1726          * Select timing interface
1727          */
1728         err = mmc_select_timing(card);
1729         if (err)
1730                 goto free_card;
1731
1732         if (mmc_card_hs200(card)) {
1733                 err = mmc_hs200_tuning(card);
1734                 if (err)
1735                         goto free_card;
1736
1737                 err = mmc_select_hs400(card);
1738                 if (err)
1739                         goto free_card;
1740         } else if (!mmc_card_hs400es(card)) {
1741                 /* Select the desired bus width optionally */
1742                 err = mmc_select_bus_width(card);
1743                 if (err > 0 && mmc_card_hs(card)) {
1744                         err = mmc_select_hs_ddr(card);
1745                         if (err)
1746                                 goto free_card;
1747                 }
1748         }
1749
1750         /*
1751          * Choose the power class with selected bus interface
1752          */
1753         mmc_select_powerclass(card);
1754
1755         /*
1756          * Enable HPI feature (if supported)
1757          */
1758         if (card->ext_csd.hpi) {
1759                 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
1760                                 EXT_CSD_HPI_MGMT, 1,
1761                                 card->ext_csd.generic_cmd6_time);
1762                 if (err && err != -EBADMSG)
1763                         goto free_card;
1764                 if (err) {
1765                         pr_warn("%s: Enabling HPI failed\n",
1766                                 mmc_hostname(card->host));
1767                         err = 0;
1768                 } else
1769                         card->ext_csd.hpi_en = 1;
1770         }
1771
1772         /*
1773          * If cache size is higher than 0, this indicates
1774          * the existence of cache and it can be turned on.
1775          */
1776         if (!mmc_card_broken_hpi(card) &&
1777             card->ext_csd.cache_size > 0) {
1778                 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
1779                                 EXT_CSD_CACHE_CTRL, 1,
1780                                 card->ext_csd.generic_cmd6_time);
1781                 if (err && err != -EBADMSG)
1782                         goto free_card;
1783
1784                 /*
1785                  * Only if no error, cache is turned on successfully.
1786                  */
1787                 if (err) {
1788                         pr_warn("%s: Cache is supported, but failed to turn on (%d)\n",
1789                                 mmc_hostname(card->host), err);
1790                         card->ext_csd.cache_ctrl = 0;
1791                         err = 0;
1792                 } else {
1793                         card->ext_csd.cache_ctrl = 1;
1794                 }
1795         }
1796
1797         /*
1798          * Enable Command Queue if supported. Note that Packed Commands cannot
1799          * be used with Command Queue.
1800          */
1801         card->ext_csd.cmdq_en = false;
1802         if (card->ext_csd.cmdq_support && host->caps2 & MMC_CAP2_CQE) {
1803                 err = mmc_cmdq_enable(card);
1804                 if (err && err != -EBADMSG)
1805                         goto free_card;
1806                 if (err) {
1807                         pr_warn("%s: Enabling CMDQ failed\n",
1808                                 mmc_hostname(card->host));
1809                         card->ext_csd.cmdq_support = false;
1810                         card->ext_csd.cmdq_depth = 0;
1811                         err = 0;
1812                 }
1813         }
1814         /*
1815          * In some cases (e.g. RPMB or mmc_test), the Command Queue must be
1816          * disabled for a time, so a flag is needed to indicate to re-enable the
1817          * Command Queue.
1818          */
1819         card->reenable_cmdq = card->ext_csd.cmdq_en;
1820
1821         if (card->ext_csd.cmdq_en && !host->cqe_enabled) {
1822                 err = host->cqe_ops->cqe_enable(host, card);
1823                 if (err) {
1824                         pr_err("%s: Failed to enable CQE, error %d\n",
1825                                 mmc_hostname(host), err);
1826                 } else {
1827                         host->cqe_enabled = true;
1828                         pr_info("%s: Command Queue Engine enabled\n",
1829                                 mmc_hostname(host));
1830                 }
1831         }
1832
1833         if (!oldcard)
1834                 host->card = card;
1835
1836         return 0;
1837
1838 free_card:
1839         if (!oldcard)
1840                 mmc_remove_card(card);
1841 err:
1842         return err;
1843 }
1844
1845 static int mmc_can_sleep(struct mmc_card *card)
1846 {
1847         return (card && card->ext_csd.rev >= 3);
1848 }
1849
1850 static int mmc_sleep(struct mmc_host *host)
1851 {
1852         struct mmc_command cmd = {};
1853         struct mmc_card *card = host->card;
1854         unsigned int timeout_ms = DIV_ROUND_UP(card->ext_csd.sa_timeout, 10000);
1855         int err;
1856
1857         /* Re-tuning can't be done once the card is deselected */
1858         mmc_retune_hold(host);
1859
1860         err = mmc_deselect_cards(host);
1861         if (err)
1862                 goto out_release;
1863
1864         cmd.opcode = MMC_SLEEP_AWAKE;
1865         cmd.arg = card->rca << 16;
1866         cmd.arg |= 1 << 15;
1867
1868         /*
1869          * If the max_busy_timeout of the host is specified, validate it against
1870          * the sleep cmd timeout. A failure means we need to prevent the host
1871          * from doing hw busy detection, which is done by converting to a R1
1872          * response instead of a R1B.
1873          */
1874         if (host->max_busy_timeout && (timeout_ms > host->max_busy_timeout)) {
1875                 cmd.flags = MMC_RSP_R1 | MMC_CMD_AC;
1876         } else {
1877                 cmd.flags = MMC_RSP_R1B | MMC_CMD_AC;
1878                 cmd.busy_timeout = timeout_ms;
1879         }
1880
1881         err = mmc_wait_for_cmd(host, &cmd, 0);
1882         if (err)
1883                 goto out_release;
1884
1885         /*
1886          * If the host does not wait while the card signals busy, then we will
1887          * will have to wait the sleep/awake timeout.  Note, we cannot use the
1888          * SEND_STATUS command to poll the status because that command (and most
1889          * others) is invalid while the card sleeps.
1890          */
1891         if (!cmd.busy_timeout || !(host->caps & MMC_CAP_WAIT_WHILE_BUSY))
1892                 mmc_delay(timeout_ms);
1893
1894 out_release:
1895         mmc_retune_release(host);
1896         return err;
1897 }
1898
1899 static int mmc_can_poweroff_notify(const struct mmc_card *card)
1900 {
1901         return card &&
1902                 mmc_card_mmc(card) &&
1903                 (card->ext_csd.power_off_notification == EXT_CSD_POWER_ON);
1904 }
1905
1906 static int mmc_poweroff_notify(struct mmc_card *card, unsigned int notify_type)
1907 {
1908         unsigned int timeout = card->ext_csd.generic_cmd6_time;
1909         int err;
1910
1911         /* Use EXT_CSD_POWER_OFF_SHORT as default notification type. */
1912         if (notify_type == EXT_CSD_POWER_OFF_LONG)
1913                 timeout = card->ext_csd.power_off_longtime;
1914
1915         err = __mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
1916                         EXT_CSD_POWER_OFF_NOTIFICATION,
1917                         notify_type, timeout, 0, true, false, false);
1918         if (err)
1919                 pr_err("%s: Power Off Notification timed out, %u\n",
1920                        mmc_hostname(card->host), timeout);
1921
1922         /* Disable the power off notification after the switch operation. */
1923         card->ext_csd.power_off_notification = EXT_CSD_NO_POWER_NOTIFICATION;
1924
1925         return err;
1926 }
1927
1928 /*
1929  * Host is being removed. Free up the current card.
1930  */
1931 static void mmc_remove(struct mmc_host *host)
1932 {
1933         mmc_remove_card(host->card);
1934         host->card = NULL;
1935 }
1936
1937 /*
1938  * Card detection - card is alive.
1939  */
1940 static int mmc_alive(struct mmc_host *host)
1941 {
1942         return mmc_send_status(host->card, NULL);
1943 }
1944
1945 /*
1946  * Card detection callback from host.
1947  */
1948 static void mmc_detect(struct mmc_host *host)
1949 {
1950         int err;
1951
1952         mmc_get_card(host->card, NULL);
1953
1954         /*
1955          * Just check if our card has been removed.
1956          */
1957         err = _mmc_detect_card_removed(host);
1958
1959         mmc_put_card(host->card, NULL);
1960
1961         if (err) {
1962                 mmc_remove(host);
1963
1964                 mmc_claim_host(host);
1965                 mmc_detach_bus(host);
1966                 mmc_power_off(host);
1967                 mmc_release_host(host);
1968         }
1969 }
1970
1971 static int _mmc_suspend(struct mmc_host *host, bool is_suspend)
1972 {
1973         int err = 0;
1974         unsigned int notify_type = is_suspend ? EXT_CSD_POWER_OFF_SHORT :
1975                                         EXT_CSD_POWER_OFF_LONG;
1976
1977         mmc_claim_host(host);
1978
1979         if (mmc_card_suspended(host->card))
1980                 goto out;
1981
1982         if (mmc_card_doing_bkops(host->card)) {
1983                 err = mmc_stop_bkops(host->card);
1984                 if (err)
1985                         goto out;
1986         }
1987
1988         err = mmc_flush_cache(host->card);
1989         if (err)
1990                 goto out;
1991
1992         if (mmc_can_poweroff_notify(host->card) &&
1993                 ((host->caps2 & MMC_CAP2_FULL_PWR_CYCLE) || !is_suspend))
1994                 err = mmc_poweroff_notify(host->card, notify_type);
1995         else if (mmc_can_sleep(host->card))
1996                 err = mmc_sleep(host);
1997         else if (!mmc_host_is_spi(host))
1998                 err = mmc_deselect_cards(host);
1999
2000         if (!err) {
2001                 mmc_power_off(host);
2002                 mmc_card_set_suspended(host->card);
2003         }
2004 out:
2005         mmc_release_host(host);
2006         return err;
2007 }
2008
2009 /*
2010  * Suspend callback
2011  */
2012 static int mmc_suspend(struct mmc_host *host)
2013 {
2014         int err;
2015
2016         err = _mmc_suspend(host, true);
2017         if (!err) {
2018                 pm_runtime_disable(&host->card->dev);
2019                 pm_runtime_set_suspended(&host->card->dev);
2020         }
2021
2022         return err;
2023 }
2024
2025 /*
2026  * This function tries to determine if the same card is still present
2027  * and, if so, restore all state to it.
2028  */
2029 static int _mmc_resume(struct mmc_host *host)
2030 {
2031         int err = 0;
2032
2033         mmc_claim_host(host);
2034
2035         if (!mmc_card_suspended(host->card))
2036                 goto out;
2037
2038         mmc_power_up(host, host->card->ocr);
2039         err = mmc_init_card(host, host->card->ocr, host->card);
2040         mmc_card_clr_suspended(host->card);
2041
2042 out:
2043         mmc_release_host(host);
2044         return err;
2045 }
2046
2047 /*
2048  * Shutdown callback
2049  */
2050 static int mmc_shutdown(struct mmc_host *host)
2051 {
2052         int err = 0;
2053
2054         /*
2055          * In a specific case for poweroff notify, we need to resume the card
2056          * before we can shutdown it properly.
2057          */
2058         if (mmc_can_poweroff_notify(host->card) &&
2059                 !(host->caps2 & MMC_CAP2_FULL_PWR_CYCLE))
2060                 err = _mmc_resume(host);
2061
2062         if (!err)
2063                 err = _mmc_suspend(host, false);
2064
2065         return err;
2066 }
2067
2068 /*
2069  * Callback for resume.
2070  */
2071 static int mmc_resume(struct mmc_host *host)
2072 {
2073         pm_runtime_enable(&host->card->dev);
2074         return 0;
2075 }
2076
2077 /*
2078  * Callback for runtime_suspend.
2079  */
2080 static int mmc_runtime_suspend(struct mmc_host *host)
2081 {
2082         int err;
2083
2084         if (!(host->caps & MMC_CAP_AGGRESSIVE_PM))
2085                 return 0;
2086
2087         err = _mmc_suspend(host, true);
2088         if (err)
2089                 pr_err("%s: error %d doing aggressive suspend\n",
2090                         mmc_hostname(host), err);
2091
2092         return err;
2093 }
2094
2095 /*
2096  * Callback for runtime_resume.
2097  */
2098 static int mmc_runtime_resume(struct mmc_host *host)
2099 {
2100         int err;
2101
2102         err = _mmc_resume(host);
2103         if (err && err != -ENOMEDIUM)
2104                 pr_err("%s: error %d doing runtime resume\n",
2105                         mmc_hostname(host), err);
2106
2107         return 0;
2108 }
2109
2110 static int mmc_can_reset(struct mmc_card *card)
2111 {
2112         u8 rst_n_function;
2113
2114         rst_n_function = card->ext_csd.rst_n_function;
2115         if ((rst_n_function & EXT_CSD_RST_N_EN_MASK) != EXT_CSD_RST_N_ENABLED)
2116                 return 0;
2117         return 1;
2118 }
2119
2120 static int mmc_reset(struct mmc_host *host)
2121 {
2122         struct mmc_card *card = host->card;
2123
2124         /*
2125          * In the case of recovery, we can't expect flushing the cache to work
2126          * always, but we have a go and ignore errors.
2127          */
2128         mmc_flush_cache(host->card);
2129
2130         if ((host->caps & MMC_CAP_HW_RESET) && host->ops->hw_reset &&
2131              mmc_can_reset(card)) {
2132                 /* If the card accept RST_n signal, send it. */
2133                 mmc_set_clock(host, host->f_init);
2134                 host->ops->hw_reset(host);
2135                 /* Set initial state and call mmc_set_ios */
2136                 mmc_set_initial_state(host);
2137         } else {
2138                 /* Do a brute force power cycle */
2139                 mmc_power_cycle(host, card->ocr);
2140                 mmc_pwrseq_reset(host);
2141         }
2142         return mmc_init_card(host, card->ocr, card);
2143 }
2144
2145 static const struct mmc_bus_ops mmc_ops = {
2146         .remove = mmc_remove,
2147         .detect = mmc_detect,
2148         .suspend = mmc_suspend,
2149         .resume = mmc_resume,
2150         .runtime_suspend = mmc_runtime_suspend,
2151         .runtime_resume = mmc_runtime_resume,
2152         .alive = mmc_alive,
2153         .shutdown = mmc_shutdown,
2154         .reset = mmc_reset,
2155 };
2156
2157 /*
2158  * Starting point for MMC card init.
2159  */
2160 int mmc_attach_mmc(struct mmc_host *host)
2161 {
2162         int err;
2163         u32 ocr, rocr;
2164
2165         WARN_ON(!host->claimed);
2166
2167         /* Set correct bus mode for MMC before attempting attach */
2168         if (!mmc_host_is_spi(host))
2169                 mmc_set_bus_mode(host, MMC_BUSMODE_OPENDRAIN);
2170
2171         err = mmc_send_op_cond(host, 0, &ocr);
2172         if (err)
2173                 return err;
2174
2175         mmc_attach_bus(host, &mmc_ops);
2176         if (host->ocr_avail_mmc)
2177                 host->ocr_avail = host->ocr_avail_mmc;
2178
2179         /*
2180          * We need to get OCR a different way for SPI.
2181          */
2182         if (mmc_host_is_spi(host)) {
2183                 err = mmc_spi_read_ocr(host, 1, &ocr);
2184                 if (err)
2185                         goto err;
2186         }
2187
2188         rocr = mmc_select_voltage(host, ocr);
2189
2190         /*
2191          * Can we support the voltage of the card?
2192          */
2193         if (!rocr) {
2194                 err = -EINVAL;
2195                 goto err;
2196         }
2197
2198         /*
2199          * Detect and init the card.
2200          */
2201         err = mmc_init_card(host, rocr, NULL);
2202         if (err)
2203                 goto err;
2204
2205         mmc_release_host(host);
2206         err = mmc_add_card(host->card);
2207         if (err)
2208                 goto remove_card;
2209
2210         mmc_claim_host(host);
2211         return 0;
2212
2213 remove_card:
2214         mmc_remove_card(host->card);
2215         mmc_claim_host(host);
2216         host->card = NULL;
2217 err:
2218         mmc_detach_bus(host);
2219
2220         pr_err("%s: error %d whilst initialising MMC card\n",
2221                 mmc_hostname(host), err);
2222
2223         return err;
2224 }