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 #define MIN_CACHE_EN_TIMEOUT_MS 1600
  34
  35 static const unsigned int tran_exp[] = {
  36         10000,          100000,         1000000,        10000000,
  37         0,              0,              0,              0
  38 };
  39
  40 static const unsigned char tran_mant[] = {
  41         0,      10,     12,     13,     15,     20,     25,     30,
  42         35,     40,     45,     50,     55,     60,     70,     80,
  43 };
  44
  45 static const unsigned int taac_exp[] = {
  46         1,      10,     100,    1000,   10000,  100000, 1000000, 10000000,
  47 };
  48
  49 static const unsigned int taac_mant[] = {
  50         0,      10,     12,     13,     15,     20,     25,     30,
  51         35,     40,     45,     50,     55,     60,     70,     80,
  52 };
  53
  54 #define UNSTUFF_BITS(resp,start,size)                                   \
  55         ({                                                              \
  56                 const int __size = size;                                \
  57                 const u32 __mask = (__size < 32 ? 1 << __size : 0) - 1; \
  58                 const int __off = 3 - ((start) / 32);                   \
  59                 const int __shft = (start) & 31;                        \
  60                 u32 __res;                                              \
  61                                                                         \
  62                 __res = resp[__off] >> __shft;                          \
  63                 if (__size + __shft > 32)                               \
  64                         __res |= resp[__off-1] << ((32 - __shft) % 32); \
  65                 __res & __mask;                                         \
  66         })
  67
  68 /*
  69  * Given the decoded CSD structure, decode the raw CID to our CID structure.
  70  */
  71 static int mmc_decode_cid(struct mmc_card *card)
  72 {
  73         u32 *resp = card->raw_cid;
  74
  75         /*
  76          * The selection of the format here is based upon published
  77          * specs from sandisk and from what people have reported.
  78          */
  79         switch (card->csd.mmca_vsn) {
  80         case 0: /* MMC v1.0 - v1.2 */
  81         case 1: /* MMC v1.4 */
  82                 card->cid.manfid        = UNSTUFF_BITS(resp, 104, 24);
  83                 card->cid.prod_name[0]  = UNSTUFF_BITS(resp, 96, 8);
  84                 card->cid.prod_name[1]  = UNSTUFF_BITS(resp, 88, 8);
  85                 card->cid.prod_name[2]  = UNSTUFF_BITS(resp, 80, 8);
  86                 card->cid.prod_name[3]  = UNSTUFF_BITS(resp, 72, 8);
  87                 card->cid.prod_name[4]  = UNSTUFF_BITS(resp, 64, 8);
  88                 card->cid.prod_name[5]  = UNSTUFF_BITS(resp, 56, 8);
  89                 card->cid.prod_name[6]  = UNSTUFF_BITS(resp, 48, 8);
  90                 card->cid.hwrev         = UNSTUFF_BITS(resp, 44, 4);
  91                 card->cid.fwrev         = UNSTUFF_BITS(resp, 40, 4);
  92                 card->cid.serial        = UNSTUFF_BITS(resp, 16, 24);
  93                 card->cid.month         = UNSTUFF_BITS(resp, 12, 4);
  94                 card->cid.year          = UNSTUFF_BITS(resp, 8, 4) + 1997;
  95                 break;
  96
  97         case 2: /* MMC v2.0 - v2.2 */
  98         case 3: /* MMC v3.1 - v3.3 */
  99         case 4: /* MMC v4 */
 100                 card->cid.manfid        = UNSTUFF_BITS(resp, 120, 8);
 101                 card->cid.oemid         = UNSTUFF_BITS(resp, 104, 16);
 102                 card->cid.prod_name[0]  = UNSTUFF_BITS(resp, 96, 8);
 103                 card->cid.prod_name[1]  = UNSTUFF_BITS(resp, 88, 8);
 104                 card->cid.prod_name[2]  = UNSTUFF_BITS(resp, 80, 8);
 105                 card->cid.prod_name[3]  = UNSTUFF_BITS(resp, 72, 8);
 106                 card->cid.prod_name[4]  = UNSTUFF_BITS(resp, 64, 8);
 107                 card->cid.prod_name[5]  = UNSTUFF_BITS(resp, 56, 8);
 108                 card->cid.prv           = UNSTUFF_BITS(resp, 48, 8);
 109                 card->cid.serial        = UNSTUFF_BITS(resp, 16, 32);
 110                 card->cid.month         = UNSTUFF_BITS(resp, 12, 4);
 111                 card->cid.year          = UNSTUFF_BITS(resp, 8, 4) + 1997;
 112                 break;
 113
 114         default:
 115                 pr_err("%s: card has unknown MMCA version %d\n",
 116                         mmc_hostname(card->host), card->csd.mmca_vsn);
 117                 return -EINVAL;
 118         }
 119
 120         return 0;
 121 }
 122
 123 static void mmc_set_erase_size(struct mmc_card *card)
 124 {
 125         if (card->ext_csd.erase_group_def & 1)
 126                 card->erase_size = card->ext_csd.hc_erase_size;
 127         else
 128                 card->erase_size = card->csd.erase_size;
 129
 130         mmc_init_erase(card);
 131 }
 132
 133 /*
 134  * Given a 128-bit response, decode to our card CSD structure.
 135  */
 136 static int mmc_decode_csd(struct mmc_card *card)
 137 {
 138         struct mmc_csd *csd = &card->csd;
 139         unsigned int e, m, a, b;
 140         u32 *resp = card->raw_csd;
 141
 142         /*
 143          * We only understand CSD structure v1.1 and v1.2.
 144          * v1.2 has extra information in bits 15, 11 and 10.
 145          * We also support eMMC v4.4 & v4.41.
 146          */
 147         csd->structure = UNSTUFF_BITS(resp, 126, 2);
 148         if (csd->structure == 0) {
 149                 pr_err("%s: unrecognised CSD structure version %d\n",
 150                         mmc_hostname(card->host), csd->structure);
 151                 return -EINVAL;
 152         }
 153
 154         csd->mmca_vsn    = UNSTUFF_BITS(resp, 122, 4);
 155         m = UNSTUFF_BITS(resp, 115, 4);
 156         e = UNSTUFF_BITS(resp, 112, 3);
 157         csd->taac_ns     = (taac_exp[e] * taac_mant[m] + 9) / 10;
 158         csd->taac_clks   = UNSTUFF_BITS(resp, 104, 8) * 100;
 159
 160         m = UNSTUFF_BITS(resp, 99, 4);
 161         e = UNSTUFF_BITS(resp, 96, 3);
 162         csd->max_dtr      = tran_exp[e] * tran_mant[m];
 163         csd->cmdclass     = UNSTUFF_BITS(resp, 84, 12);
 164
 165         e = UNSTUFF_BITS(resp, 47, 3);
 166         m = UNSTUFF_BITS(resp, 62, 12);
 167         csd->capacity     = (1 + m) << (e + 2);
 168
 169         csd->read_blkbits = UNSTUFF_BITS(resp, 80, 4);
 170         csd->read_partial = UNSTUFF_BITS(resp, 79, 1);
 171         csd->write_misalign = UNSTUFF_BITS(resp, 78, 1);
 172         csd->read_misalign = UNSTUFF_BITS(resp, 77, 1);
 173         csd->dsr_imp = UNSTUFF_BITS(resp, 76, 1);
 174         csd->r2w_factor = UNSTUFF_BITS(resp, 26, 3);
 175         csd->write_blkbits = UNSTUFF_BITS(resp, 22, 4);
 176         csd->write_partial = UNSTUFF_BITS(resp, 21, 1);
 177
 178         if (csd->write_blkbits >= 9) {
 179                 a = UNSTUFF_BITS(resp, 42, 5);
 180                 b = UNSTUFF_BITS(resp, 37, 5);
 181                 csd->erase_size = (a + 1) * (b + 1);
 182                 csd->erase_size <<= csd->write_blkbits - 9;
 183         }
 184
 185         return 0;
 186 }
 187
 188 static void mmc_select_card_type(struct mmc_card *card)
 189 {
 190         struct mmc_host *host = card->host;
 191         u8 card_type = card->ext_csd.raw_card_type;
 192         u32 caps = host->caps, caps2 = host->caps2;
 193         unsigned int hs_max_dtr = 0, hs200_max_dtr = 0;
 194         unsigned int avail_type = 0;
 195
 196         if (caps & MMC_CAP_MMC_HIGHSPEED &&
 197             card_type & EXT_CSD_CARD_TYPE_HS_26) {
 198                 hs_max_dtr = MMC_HIGH_26_MAX_DTR;
 199                 avail_type |= EXT_CSD_CARD_TYPE_HS_26;
 200         }
 201
 202         if (caps & MMC_CAP_MMC_HIGHSPEED &&
 203             card_type & EXT_CSD_CARD_TYPE_HS_52) {
 204                 hs_max_dtr = MMC_HIGH_52_MAX_DTR;
 205                 avail_type |= EXT_CSD_CARD_TYPE_HS_52;
 206         }
 207
 208         if (caps & (MMC_CAP_1_8V_DDR | MMC_CAP_3_3V_DDR) &&
 209             card_type & EXT_CSD_CARD_TYPE_DDR_1_8V) {
 210                 hs_max_dtr = MMC_HIGH_DDR_MAX_DTR;
 211                 avail_type |= EXT_CSD_CARD_TYPE_DDR_1_8V;
 212         }
 213
 214         if (caps & MMC_CAP_1_2V_DDR &&
 215             card_type & EXT_CSD_CARD_TYPE_DDR_1_2V) {
 216                 hs_max_dtr = MMC_HIGH_DDR_MAX_DTR;
 217                 avail_type |= EXT_CSD_CARD_TYPE_DDR_1_2V;
 218         }
 219
 220         if (caps2 & MMC_CAP2_HS200_1_8V_SDR &&
 221             card_type & EXT_CSD_CARD_TYPE_HS200_1_8V) {
 222                 hs200_max_dtr = MMC_HS200_MAX_DTR;
 223                 avail_type |= EXT_CSD_CARD_TYPE_HS200_1_8V;
 224         }
 225
 226         if (caps2 & MMC_CAP2_HS200_1_2V_SDR &&
 227             card_type & EXT_CSD_CARD_TYPE_HS200_1_2V) {
 228                 hs200_max_dtr = MMC_HS200_MAX_DTR;
 229                 avail_type |= EXT_CSD_CARD_TYPE_HS200_1_2V;
 230         }
 231
 232         if (caps2 & MMC_CAP2_HS400_1_8V &&
 233             card_type & EXT_CSD_CARD_TYPE_HS400_1_8V) {
 234                 hs200_max_dtr = MMC_HS200_MAX_DTR;
 235                 avail_type |= EXT_CSD_CARD_TYPE_HS400_1_8V;
 236         }
 237
 238         if (caps2 & MMC_CAP2_HS400_1_2V &&
 239             card_type & EXT_CSD_CARD_TYPE_HS400_1_2V) {
 240                 hs200_max_dtr = MMC_HS200_MAX_DTR;
 241                 avail_type |= EXT_CSD_CARD_TYPE_HS400_1_2V;
 242         }
 243
 244         if ((caps2 & MMC_CAP2_HS400_ES) &&
 245             card->ext_csd.strobe_support &&
 246             (avail_type & EXT_CSD_CARD_TYPE_HS400))
 247                 avail_type |= EXT_CSD_CARD_TYPE_HS400ES;
 248
 249         card->ext_csd.hs_max_dtr = hs_max_dtr;
 250         card->ext_csd.hs200_max_dtr = hs200_max_dtr;
 251         card->mmc_avail_type = avail_type;
 252 }
 253
 254 static void mmc_manage_enhanced_area(struct mmc_card *card, u8 *ext_csd)
 255 {
 256         u8 hc_erase_grp_sz, hc_wp_grp_sz;
 257
 258         /*
 259          * Disable these attributes by default
 260          */
 261         card->ext_csd.enhanced_area_offset = -EINVAL;
 262         card->ext_csd.enhanced_area_size = -EINVAL;
 263
 264         /*
 265          * Enhanced area feature support -- check whether the eMMC
 266          * card has the Enhanced area enabled.  If so, export enhanced
 267          * area offset and size to user by adding sysfs interface.
 268          */
 269         if ((ext_csd[EXT_CSD_PARTITION_SUPPORT] & 0x2) &&
 270             (ext_csd[EXT_CSD_PARTITION_ATTRIBUTE] & 0x1)) {
 271                 if (card->ext_csd.partition_setting_completed) {
 272                         hc_erase_grp_sz =
 273                                 ext_csd[EXT_CSD_HC_ERASE_GRP_SIZE];
 274                         hc_wp_grp_sz =
 275                                 ext_csd[EXT_CSD_HC_WP_GRP_SIZE];
 276
 277                         /*
 278                          * calculate the enhanced data area offset, in bytes
 279                          */
 280                         card->ext_csd.enhanced_area_offset =
 281                                 (((unsigned long long)ext_csd[139]) << 24) +
 282                                 (((unsigned long long)ext_csd[138]) << 16) +
 283                                 (((unsigned long long)ext_csd[137]) << 8) +
 284                                 (((unsigned long long)ext_csd[136]));
 285                         if (mmc_card_blockaddr(card))
 286                                 card->ext_csd.enhanced_area_offset <<= 9;
 287                         /*
 288                          * calculate the enhanced data area size, in kilobytes
 289                          */
 290                         card->ext_csd.enhanced_area_size =
 291                                 (ext_csd[142] << 16) + (ext_csd[141] << 8) +
 292                                 ext_csd[140];
 293                         card->ext_csd.enhanced_area_size *=
 294                                 (size_t)(hc_erase_grp_sz * hc_wp_grp_sz);
 295                         card->ext_csd.enhanced_area_size <<= 9;
 296                 } else {
 297                         pr_warn("%s: defines enhanced area without partition setting complete\n",
 298                                 mmc_hostname(card->host));
 299                 }
 300         }
 301 }
 302
 303 static void mmc_part_add(struct mmc_card *card, unsigned int size,
 304                          unsigned int part_cfg, char *name, int idx, bool ro,
 305                          int area_type)
 306 {
 307         card->part[card->nr_parts].size = size;
 308         card->part[card->nr_parts].part_cfg = part_cfg;
 309         sprintf(card->part[card->nr_parts].name, name, idx);
 310         card->part[card->nr_parts].force_ro = ro;
 311         card->part[card->nr_parts].area_type = area_type;
 312         card->nr_parts++;
 313 }
 314
 315 static void mmc_manage_gp_partitions(struct mmc_card *card, u8 *ext_csd)
 316 {
 317         int idx;
 318         u8 hc_erase_grp_sz, hc_wp_grp_sz;
 319         unsigned int part_size;
 320
 321         /*
 322          * General purpose partition feature support --
 323          * If ext_csd has the size of general purpose partitions,
 324          * set size, part_cfg, partition name in mmc_part.
 325          */
 326         if (ext_csd[EXT_CSD_PARTITION_SUPPORT] &
 327             EXT_CSD_PART_SUPPORT_PART_EN) {
 328                 hc_erase_grp_sz =
 329                         ext_csd[EXT_CSD_HC_ERASE_GRP_SIZE];
 330                 hc_wp_grp_sz =
 331                         ext_csd[EXT_CSD_HC_WP_GRP_SIZE];
 332
 333                 for (idx = 0; idx < MMC_NUM_GP_PARTITION; idx++) {
 334                         if (!ext_csd[EXT_CSD_GP_SIZE_MULT + idx * 3] &&
 335                             !ext_csd[EXT_CSD_GP_SIZE_MULT + idx * 3 + 1] &&
 336                             !ext_csd[EXT_CSD_GP_SIZE_MULT + idx * 3 + 2])
 337                                 continue;
 338                         if (card->ext_csd.partition_setting_completed == 0) {
 339                                 pr_warn("%s: has partition size defined without partition complete\n",
 340                                         mmc_hostname(card->host));
 341                                 break;
 342                         }
 343                         part_size =
 344                                 (ext_csd[EXT_CSD_GP_SIZE_MULT + idx * 3 + 2]
 345                                 << 16) +
 346                                 (ext_csd[EXT_CSD_GP_SIZE_MULT + idx * 3 + 1]
 347                                 << 8) +
 348                                 ext_csd[EXT_CSD_GP_SIZE_MULT + idx * 3];
 349                         part_size *= (size_t)(hc_erase_grp_sz *
 350                                 hc_wp_grp_sz);
 351                         mmc_part_add(card, part_size << 19,
 352                                 EXT_CSD_PART_CONFIG_ACC_GP0 + idx,
 353                                 "gp%d", idx, false,
 354                                 MMC_BLK_DATA_AREA_GP);
 355                 }
 356         }
 357 }
 358
 359 /* Minimum partition switch timeout in milliseconds */
 360 #define MMC_MIN_PART_SWITCH_TIME        300
 361
 362 /*
 363  * Decode extended CSD.
 364  */
 365 static int mmc_decode_ext_csd(struct mmc_card *card, u8 *ext_csd)
 366 {
 367         int err = 0, idx;
 368         unsigned int part_size;
 369         struct device_node *np;
 370         bool broken_hpi = false;
 371
 372         /* Version is coded in the CSD_STRUCTURE byte in the EXT_CSD register */
 373         card->ext_csd.raw_ext_csd_structure = ext_csd[EXT_CSD_STRUCTURE];
 374         if (card->csd.structure == 3) {
 375                 if (card->ext_csd.raw_ext_csd_structure > 2) {
 376                         pr_err("%s: unrecognised EXT_CSD structure "
 377                                 "version %d\n", mmc_hostname(card->host),
 378                                         card->ext_csd.raw_ext_csd_structure);
 379                         err = -EINVAL;
 380                         goto out;
 381                 }
 382         }
 383
 384         np = mmc_of_find_child_device(card->host, 0);
 385         if (np && of_device_is_compatible(np, "mmc-card"))
 386                 broken_hpi = of_property_read_bool(np, "broken-hpi");
 387         of_node_put(np);
 388
 389         /*
 390          * The EXT_CSD format is meant to be forward compatible. As long
 391          * as CSD_STRUCTURE does not change, all values for EXT_CSD_REV
 392          * are authorized, see JEDEC JESD84-B50 section B.8.
 393          */
 394         card->ext_csd.rev = ext_csd[EXT_CSD_REV];
 395
 396         /* fixup device after ext_csd revision field is updated */
 397         mmc_fixup_device(card, mmc_ext_csd_fixups);
 398
 399         card->ext_csd.raw_sectors[0] = ext_csd[EXT_CSD_SEC_CNT + 0];
 400         card->ext_csd.raw_sectors[1] = ext_csd[EXT_CSD_SEC_CNT + 1];
 401         card->ext_csd.raw_sectors[2] = ext_csd[EXT_CSD_SEC_CNT + 2];
 402         card->ext_csd.raw_sectors[3] = ext_csd[EXT_CSD_SEC_CNT + 3];
 403         if (card->ext_csd.rev >= 2) {
 404                 card->ext_csd.sectors =
 405                         ext_csd[EXT_CSD_SEC_CNT + 0] << 0 |
 406                         ext_csd[EXT_CSD_SEC_CNT + 1] << 8 |
 407                         ext_csd[EXT_CSD_SEC_CNT + 2] << 16 |
 408                         ext_csd[EXT_CSD_SEC_CNT + 3] << 24;
 409
 410                 /* Cards with density > 2GiB are sector addressed */
 411                 if (card->ext_csd.sectors > (2u * 1024 * 1024 * 1024) / 512)
 412                         mmc_card_set_blockaddr(card);
 413         }
 414
 415         card->ext_csd.strobe_support = ext_csd[EXT_CSD_STROBE_SUPPORT];
 416         card->ext_csd.raw_card_type = ext_csd[EXT_CSD_CARD_TYPE];
 417         mmc_select_card_type(card);
 418
 419         card->ext_csd.raw_s_a_timeout = ext_csd[EXT_CSD_S_A_TIMEOUT];
 420         card->ext_csd.raw_erase_timeout_mult =
 421                 ext_csd[EXT_CSD_ERASE_TIMEOUT_MULT];
 422         card->ext_csd.raw_hc_erase_grp_size =
 423                 ext_csd[EXT_CSD_HC_ERASE_GRP_SIZE];
 424         if (card->ext_csd.rev >= 3) {
 425                 u8 sa_shift = ext_csd[EXT_CSD_S_A_TIMEOUT];
 426                 card->ext_csd.part_config = ext_csd[EXT_CSD_PART_CONFIG];
 427
 428                 /* EXT_CSD value is in units of 10ms, but we store in ms */
 429                 card->ext_csd.part_time = 10 * ext_csd[EXT_CSD_PART_SWITCH_TIME];
 430                 /* Some eMMC set the value too low so set a minimum */
 431                 if (card->ext_csd.part_time &&
 432                     card->ext_csd.part_time < MMC_MIN_PART_SWITCH_TIME)
 433                         card->ext_csd.part_time = MMC_MIN_PART_SWITCH_TIME;
 434
 435                 /* Sleep / awake timeout in 100ns units */
 436                 if (sa_shift > 0 && sa_shift <= 0x17)
 437                         card->ext_csd.sa_timeout =
 438                                         1 << ext_csd[EXT_CSD_S_A_TIMEOUT];
 439                 card->ext_csd.erase_group_def =
 440                         ext_csd[EXT_CSD_ERASE_GROUP_DEF];
 441                 card->ext_csd.hc_erase_timeout = 300 *
 442                         ext_csd[EXT_CSD_ERASE_TIMEOUT_MULT];
 443                 card->ext_csd.hc_erase_size =
 444                         ext_csd[EXT_CSD_HC_ERASE_GRP_SIZE] << 10;
 445
 446                 card->ext_csd.rel_sectors = ext_csd[EXT_CSD_REL_WR_SEC_C];
 447
 448                 /*
 449                  * There are two boot regions of equal size, defined in
 450                  * multiples of 128K.
 451                  */
 452                 if (ext_csd[EXT_CSD_BOOT_MULT] && mmc_boot_partition_access(card->host)) {
 453                         for (idx = 0; idx < MMC_NUM_BOOT_PARTITION; idx++) {
 454                                 part_size = ext_csd[EXT_CSD_BOOT_MULT] << 17;
 455                                 mmc_part_add(card, part_size,
 456                                         EXT_CSD_PART_CONFIG_ACC_BOOT0 + idx,
 457                                         "boot%d", idx, true,
 458                                         MMC_BLK_DATA_AREA_BOOT);
 459                         }
 460                 }
 461         }
 462
 463         card->ext_csd.raw_hc_erase_gap_size =
 464                 ext_csd[EXT_CSD_HC_WP_GRP_SIZE];
 465         card->ext_csd.raw_sec_trim_mult =
 466                 ext_csd[EXT_CSD_SEC_TRIM_MULT];
 467         card->ext_csd.raw_sec_erase_mult =
 468                 ext_csd[EXT_CSD_SEC_ERASE_MULT];
 469         card->ext_csd.raw_sec_feature_support =
 470                 ext_csd[EXT_CSD_SEC_FEATURE_SUPPORT];
 471         card->ext_csd.raw_trim_mult =
 472                 ext_csd[EXT_CSD_TRIM_MULT];
 473         card->ext_csd.raw_partition_support = ext_csd[EXT_CSD_PARTITION_SUPPORT];
 474         card->ext_csd.raw_driver_strength = ext_csd[EXT_CSD_DRIVER_STRENGTH];
 475         if (card->ext_csd.rev >= 4) {
 476                 if (ext_csd[EXT_CSD_PARTITION_SETTING_COMPLETED] &
 477                     EXT_CSD_PART_SETTING_COMPLETED)
 478                         card->ext_csd.partition_setting_completed = 1;
 479                 else
 480                         card->ext_csd.partition_setting_completed = 0;
 481
 482                 mmc_manage_enhanced_area(card, ext_csd);
 483
 484                 mmc_manage_gp_partitions(card, ext_csd);
 485
 486                 card->ext_csd.sec_trim_mult =
 487                         ext_csd[EXT_CSD_SEC_TRIM_MULT];
 488                 card->ext_csd.sec_erase_mult =
 489                         ext_csd[EXT_CSD_SEC_ERASE_MULT];
 490                 card->ext_csd.sec_feature_support =
 491                         ext_csd[EXT_CSD_SEC_FEATURE_SUPPORT];
 492                 card->ext_csd.trim_timeout = 300 *
 493                         ext_csd[EXT_CSD_TRIM_MULT];
 494
 495                 /*
 496                  * Note that the call to mmc_part_add above defaults to read
 497                  * only. If this default assumption is changed, the call must
 498                  * take into account the value of boot_locked below.
 499                  */
 500                 card->ext_csd.boot_ro_lock = ext_csd[EXT_CSD_BOOT_WP];
 501                 card->ext_csd.boot_ro_lockable = true;
 502
 503                 /* Save power class values */
 504                 card->ext_csd.raw_pwr_cl_52_195 =
 505                         ext_csd[EXT_CSD_PWR_CL_52_195];
 506                 card->ext_csd.raw_pwr_cl_26_195 =
 507                         ext_csd[EXT_CSD_PWR_CL_26_195];
 508                 card->ext_csd.raw_pwr_cl_52_360 =
 509                         ext_csd[EXT_CSD_PWR_CL_52_360];
 510                 card->ext_csd.raw_pwr_cl_26_360 =
 511                         ext_csd[EXT_CSD_PWR_CL_26_360];
 512                 card->ext_csd.raw_pwr_cl_200_195 =
 513                         ext_csd[EXT_CSD_PWR_CL_200_195];
 514                 card->ext_csd.raw_pwr_cl_200_360 =
 515                         ext_csd[EXT_CSD_PWR_CL_200_360];
 516                 card->ext_csd.raw_pwr_cl_ddr_52_195 =
 517                         ext_csd[EXT_CSD_PWR_CL_DDR_52_195];
 518                 card->ext_csd.raw_pwr_cl_ddr_52_360 =
 519                         ext_csd[EXT_CSD_PWR_CL_DDR_52_360];
 520                 card->ext_csd.raw_pwr_cl_ddr_200_360 =
 521                         ext_csd[EXT_CSD_PWR_CL_DDR_200_360];
 522         }
 523
 524         if (card->ext_csd.rev >= 5) {
 525                 /* Adjust production date as per JEDEC JESD84-B451 */
 526                 if (card->cid.year < 2010)
 527                         card->cid.year += 16;
 528
 529                 /* check whether the eMMC card supports BKOPS */
 530                 if (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         /* Prepare host to downgrade to HS timing */
1173         if (host->ops->hs400_downgrade)
1174                 host->ops->hs400_downgrade(host);
1175
1176         /* Reduce frequency to HS frequency */
1177         max_dtr = card->ext_csd.hs_max_dtr;
1178         mmc_set_clock(host, max_dtr);
1179
1180         err = mmc_switch_status(card);
1181         if (err)
1182                 goto out_err;
1183
1184         if (host->ops->hs400_prepare_ddr)
1185                 host->ops->hs400_prepare_ddr(host);
1186
1187         /* Switch card to DDR */
1188         err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
1189                          EXT_CSD_BUS_WIDTH,
1190                          EXT_CSD_DDR_BUS_WIDTH_8,
1191                          card->ext_csd.generic_cmd6_time);
1192         if (err) {
1193                 pr_err("%s: switch to bus width for hs400 failed, err:%d\n",
1194                         mmc_hostname(host), err);
1195                 return err;
1196         }
1197
1198         /* Switch card to HS400 */
1199         val = EXT_CSD_TIMING_HS400 |
1200               card->drive_strength << EXT_CSD_DRV_STR_SHIFT;
1201         err = __mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
1202                            EXT_CSD_HS_TIMING, val,
1203                            card->ext_csd.generic_cmd6_time, 0,
1204                            true, false, true);
1205         if (err) {
1206                 pr_err("%s: switch to hs400 failed, err:%d\n",
1207                          mmc_hostname(host), err);
1208                 return err;
1209         }
1210
1211         /* Set host controller to HS400 timing and frequency */
1212         mmc_set_timing(host, MMC_TIMING_MMC_HS400);
1213         mmc_set_bus_speed(card);
1214
1215         err = mmc_switch_status(card);
1216         if (err)
1217                 goto out_err;
1218
1219         if (host->ops->hs400_complete)
1220                 host->ops->hs400_complete(host);
1221
1222         return 0;
1223
1224 out_err:
1225         pr_err("%s: %s failed, error %d\n", mmc_hostname(card->host),
1226                __func__, err);
1227         return err;
1228 }
1229
1230 int mmc_hs200_to_hs400(struct mmc_card *card)
1231 {
1232         return mmc_select_hs400(card);
1233 }
1234
1235 int mmc_hs400_to_hs200(struct mmc_card *card)
1236 {
1237         struct mmc_host *host = card->host;
1238         unsigned int max_dtr;
1239         int err;
1240         u8 val;
1241
1242         /* Reduce frequency to HS */
1243         max_dtr = card->ext_csd.hs_max_dtr;
1244         mmc_set_clock(host, max_dtr);
1245
1246         /* Switch HS400 to HS DDR */
1247         val = EXT_CSD_TIMING_HS;
1248         err = __mmc_switch(card, EXT_CSD_CMD_SET_NORMAL, EXT_CSD_HS_TIMING,
1249                            val, card->ext_csd.generic_cmd6_time, 0,
1250                            true, false, true);
1251         if (err)
1252                 goto out_err;
1253
1254         mmc_set_timing(host, MMC_TIMING_MMC_DDR52);
1255
1256         err = mmc_switch_status(card);
1257         if (err)
1258                 goto out_err;
1259
1260         /* Switch HS DDR to HS */
1261         err = __mmc_switch(card, EXT_CSD_CMD_SET_NORMAL, EXT_CSD_BUS_WIDTH,
1262                            EXT_CSD_BUS_WIDTH_8, card->ext_csd.generic_cmd6_time,
1263                            0, true, false, true);
1264         if (err)
1265                 goto out_err;
1266
1267         mmc_set_timing(host, MMC_TIMING_MMC_HS);
1268
1269         if (host->ops->hs400_downgrade)
1270                 host->ops->hs400_downgrade(host);
1271
1272         err = mmc_switch_status(card);
1273         if (err)
1274                 goto out_err;
1275
1276         /* Switch HS to HS200 */
1277         val = EXT_CSD_TIMING_HS200 |
1278               card->drive_strength << EXT_CSD_DRV_STR_SHIFT;
1279         err = __mmc_switch(card, EXT_CSD_CMD_SET_NORMAL, EXT_CSD_HS_TIMING,
1280                            val, card->ext_csd.generic_cmd6_time, 0,
1281                            true, false, true);
1282         if (err)
1283                 goto out_err;
1284
1285         mmc_set_timing(host, MMC_TIMING_MMC_HS200);
1286
1287         /*
1288          * For HS200, CRC errors are not a reliable way to know the switch
1289          * failed. If there really is a problem, we would expect tuning will
1290          * fail and the result ends up the same.
1291          */
1292         err = __mmc_switch_status(card, false);
1293         if (err)
1294                 goto out_err;
1295
1296         mmc_set_bus_speed(card);
1297
1298         /* Prepare tuning for HS400 mode. */
1299         if (host->ops->prepare_hs400_tuning)
1300                 host->ops->prepare_hs400_tuning(host, &host->ios);
1301
1302         return 0;
1303
1304 out_err:
1305         pr_err("%s: %s failed, error %d\n", mmc_hostname(card->host),
1306                __func__, err);
1307         return err;
1308 }
1309
1310 static void mmc_select_driver_type(struct mmc_card *card)
1311 {
1312         int card_drv_type, drive_strength, drv_type = 0;
1313         int fixed_drv_type = card->host->fixed_drv_type;
1314
1315         card_drv_type = card->ext_csd.raw_driver_strength |
1316                         mmc_driver_type_mask(0);
1317
1318         if (fixed_drv_type >= 0)
1319                 drive_strength = card_drv_type & mmc_driver_type_mask(fixed_drv_type)
1320                                  ? fixed_drv_type : 0;
1321         else
1322                 drive_strength = mmc_select_drive_strength(card,
1323                                                            card->ext_csd.hs200_max_dtr,
1324                                                            card_drv_type, &drv_type);
1325
1326         card->drive_strength = drive_strength;
1327
1328         if (drv_type)
1329                 mmc_set_driver_type(card->host, drv_type);
1330 }
1331
1332 static int mmc_select_hs400es(struct mmc_card *card)
1333 {
1334         struct mmc_host *host = card->host;
1335         int err = -EINVAL;
1336         u8 val;
1337
1338         if (!(host->caps & MMC_CAP_8_BIT_DATA)) {
1339                 err = -ENOTSUPP;
1340                 goto out_err;
1341         }
1342
1343         if (card->mmc_avail_type & EXT_CSD_CARD_TYPE_HS400_1_2V)
1344                 err = mmc_set_signal_voltage(host, MMC_SIGNAL_VOLTAGE_120);
1345
1346         if (err && card->mmc_avail_type & EXT_CSD_CARD_TYPE_HS400_1_8V)
1347                 err = mmc_set_signal_voltage(host, MMC_SIGNAL_VOLTAGE_180);
1348
1349         /* If fails try again during next card power cycle */
1350         if (err)
1351                 goto out_err;
1352
1353         err = mmc_select_bus_width(card);
1354         if (err != MMC_BUS_WIDTH_8) {
1355                 pr_err("%s: switch to 8bit bus width failed, err:%d\n",
1356                         mmc_hostname(host), err);
1357                 err = err < 0 ? err : -ENOTSUPP;
1358                 goto out_err;
1359         }
1360
1361         /* Switch card to HS mode */
1362         err = __mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
1363                            EXT_CSD_HS_TIMING, EXT_CSD_TIMING_HS,
1364                            card->ext_csd.generic_cmd6_time, 0,
1365                            true, false, true);
1366         if (err) {
1367                 pr_err("%s: switch to hs for hs400es failed, err:%d\n",
1368                         mmc_hostname(host), err);
1369                 goto out_err;
1370         }
1371
1372         mmc_set_timing(host, MMC_TIMING_MMC_HS);
1373         err = mmc_switch_status(card);
1374         if (err)
1375                 goto out_err;
1376
1377         mmc_set_clock(host, card->ext_csd.hs_max_dtr);
1378
1379         /* Switch card to DDR with strobe bit */
1380         val = EXT_CSD_DDR_BUS_WIDTH_8 | EXT_CSD_BUS_WIDTH_STROBE;
1381         err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
1382                          EXT_CSD_BUS_WIDTH,
1383                          val,
1384                          card->ext_csd.generic_cmd6_time);
1385         if (err) {
1386                 pr_err("%s: switch to bus width for hs400es failed, err:%d\n",
1387                         mmc_hostname(host), err);
1388                 goto out_err;
1389         }
1390
1391         mmc_select_driver_type(card);
1392
1393         /* Switch card to HS400 */
1394         val = EXT_CSD_TIMING_HS400 |
1395               card->drive_strength << EXT_CSD_DRV_STR_SHIFT;
1396         err = __mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
1397                            EXT_CSD_HS_TIMING, val,
1398                            card->ext_csd.generic_cmd6_time, 0,
1399                            true, false, true);
1400         if (err) {
1401                 pr_err("%s: switch to hs400es failed, err:%d\n",
1402                         mmc_hostname(host), err);
1403                 goto out_err;
1404         }
1405
1406         /* Set host controller to HS400 timing and frequency */
1407         mmc_set_timing(host, MMC_TIMING_MMC_HS400);
1408
1409         /* Controller enable enhanced strobe function */
1410         host->ios.enhanced_strobe = true;
1411         if (host->ops->hs400_enhanced_strobe)
1412                 host->ops->hs400_enhanced_strobe(host, &host->ios);
1413
1414         err = mmc_switch_status(card);
1415         if (err)
1416                 goto out_err;
1417
1418         return 0;
1419
1420 out_err:
1421         pr_err("%s: %s failed, error %d\n", mmc_hostname(card->host),
1422                __func__, err);
1423         return err;
1424 }
1425
1426 /*
1427  * For device supporting HS200 mode, the following sequence
1428  * should be done before executing the tuning process.
1429  * 1. set the desired bus width(4-bit or 8-bit, 1-bit is not supported)
1430  * 2. switch to HS200 mode
1431  * 3. set the clock to > 52Mhz and <=200MHz
1432  */
1433 static int mmc_select_hs200(struct mmc_card *card)
1434 {
1435         struct mmc_host *host = card->host;
1436         unsigned int old_timing, old_signal_voltage;
1437         int err = -EINVAL;
1438         u8 val;
1439
1440         old_signal_voltage = host->ios.signal_voltage;
1441         if (card->mmc_avail_type & EXT_CSD_CARD_TYPE_HS200_1_2V)
1442                 err = mmc_set_signal_voltage(host, MMC_SIGNAL_VOLTAGE_120);
1443
1444         if (err && card->mmc_avail_type & EXT_CSD_CARD_TYPE_HS200_1_8V)
1445                 err = mmc_set_signal_voltage(host, MMC_SIGNAL_VOLTAGE_180);
1446
1447         /* If fails try again during next card power cycle */
1448         if (err)
1449                 return err;
1450
1451         mmc_select_driver_type(card);
1452
1453         /*
1454          * Set the bus width(4 or 8) with host's support and
1455          * switch to HS200 mode if bus width is set successfully.
1456          */
1457         err = mmc_select_bus_width(card);
1458         if (err > 0) {
1459                 val = EXT_CSD_TIMING_HS200 |
1460                       card->drive_strength << EXT_CSD_DRV_STR_SHIFT;
1461                 err = __mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
1462                                    EXT_CSD_HS_TIMING, val,
1463                                    card->ext_csd.generic_cmd6_time, 0,
1464                                    true, false, true);
1465                 if (err)
1466                         goto err;
1467                 old_timing = host->ios.timing;
1468                 mmc_set_timing(host, MMC_TIMING_MMC_HS200);
1469
1470                 /*
1471                  * For HS200, CRC errors are not a reliable way to know the
1472                  * switch failed. If there really is a problem, we would expect
1473                  * tuning will fail and the result ends up the same.
1474                  */
1475                 err = __mmc_switch_status(card, false);
1476
1477                 /*
1478                  * mmc_select_timing() assumes timing has not changed if
1479                  * it is a switch error.
1480                  */
1481                 if (err == -EBADMSG)
1482                         mmc_set_timing(host, old_timing);
1483         }
1484 err:
1485         if (err) {
1486                 /* fall back to the old signal voltage, if fails report error */
1487                 if (mmc_set_signal_voltage(host, old_signal_voltage))
1488                         err = -EIO;
1489
1490                 pr_err("%s: %s failed, error %d\n", mmc_hostname(card->host),
1491                        __func__, err);
1492         }
1493         return err;
1494 }
1495
1496 /*
1497  * Activate High Speed, HS200 or HS400ES mode if supported.
1498  */
1499 static int mmc_select_timing(struct mmc_card *card)
1500 {
1501         int err = 0;
1502
1503         if (!mmc_can_ext_csd(card))
1504                 goto bus_speed;
1505
1506         if (card->mmc_avail_type & EXT_CSD_CARD_TYPE_HS400ES)
1507                 err = mmc_select_hs400es(card);
1508         else if (card->mmc_avail_type & EXT_CSD_CARD_TYPE_HS200)
1509                 err = mmc_select_hs200(card);
1510         else if (card->mmc_avail_type & EXT_CSD_CARD_TYPE_HS)
1511                 err = mmc_select_hs(card);
1512
1513         if (err && err != -EBADMSG)
1514                 return err;
1515
1516 bus_speed:
1517         /*
1518          * Set the bus speed to the selected bus timing.
1519          * If timing is not selected, backward compatible is the default.
1520          */
1521         mmc_set_bus_speed(card);
1522         return 0;
1523 }
1524
1525 /*
1526  * Execute tuning sequence to seek the proper bus operating
1527  * conditions for HS200 and HS400, which sends CMD21 to the device.
1528  */
1529 static int mmc_hs200_tuning(struct mmc_card *card)
1530 {
1531         struct mmc_host *host = card->host;
1532
1533         /*
1534          * Timing should be adjusted to the HS400 target
1535          * operation frequency for tuning process
1536          */
1537         if (card->mmc_avail_type & EXT_CSD_CARD_TYPE_HS400 &&
1538             host->ios.bus_width == MMC_BUS_WIDTH_8)
1539                 if (host->ops->prepare_hs400_tuning)
1540                         host->ops->prepare_hs400_tuning(host, &host->ios);
1541
1542         return mmc_execute_tuning(card);
1543 }
1544
1545 /*
1546  * Handle the detection and initialisation of a card.
1547  *
1548  * In the case of a resume, "oldcard" will contain the card
1549  * we're trying to reinitialise.
1550  */
1551 static int mmc_init_card(struct mmc_host *host, u32 ocr,
1552         struct mmc_card *oldcard)
1553 {
1554         struct mmc_card *card;
1555         int err;
1556         u32 cid[4];
1557         u32 rocr;
1558
1559         WARN_ON(!host->claimed);
1560
1561         /* Set correct bus mode for MMC before attempting init */
1562         if (!mmc_host_is_spi(host))
1563                 mmc_set_bus_mode(host, MMC_BUSMODE_OPENDRAIN);
1564
1565         /*
1566          * Since we're changing the OCR value, we seem to
1567          * need to tell some cards to go back to the idle
1568          * state.  We wait 1ms to give cards time to
1569          * respond.
1570          * mmc_go_idle is needed for eMMC that are asleep
1571          */
1572         mmc_go_idle(host);
1573
1574         /* The extra bit indicates that we support high capacity */
1575         err = mmc_send_op_cond(host, ocr | (1 << 30), &rocr);
1576         if (err)
1577                 goto err;
1578
1579         /*
1580          * For SPI, enable CRC as appropriate.
1581          */
1582         if (mmc_host_is_spi(host)) {
1583                 err = mmc_spi_set_crc(host, use_spi_crc);
1584                 if (err)
1585                         goto err;
1586         }
1587
1588         /*
1589          * Fetch CID from card.
1590          */
1591         err = mmc_send_cid(host, cid);
1592         if (err)
1593                 goto err;
1594
1595         if (oldcard) {
1596                 if (memcmp(cid, oldcard->raw_cid, sizeof(cid)) != 0) {
1597                         pr_debug("%s: Perhaps the card was replaced\n",
1598                                 mmc_hostname(host));
1599                         err = -ENOENT;
1600                         goto err;
1601                 }
1602
1603                 card = oldcard;
1604         } else {
1605                 /*
1606                  * Allocate card structure.
1607                  */
1608                 card = mmc_alloc_card(host, &mmc_type);
1609                 if (IS_ERR(card)) {
1610                         err = PTR_ERR(card);
1611                         goto err;
1612                 }
1613
1614                 card->ocr = ocr;
1615                 card->type = MMC_TYPE_MMC;
1616                 card->rca = 1;
1617                 memcpy(card->raw_cid, cid, sizeof(card->raw_cid));
1618         }
1619
1620         /*
1621          * Call the optional HC's init_card function to handle quirks.
1622          */
1623         if (host->ops->init_card)
1624                 host->ops->init_card(host, card);
1625
1626         /*
1627          * For native busses:  set card RCA and quit open drain mode.
1628          */
1629         if (!mmc_host_is_spi(host)) {
1630                 err = mmc_set_relative_addr(card);
1631                 if (err)
1632                         goto free_card;
1633
1634                 mmc_set_bus_mode(host, MMC_BUSMODE_PUSHPULL);
1635         }
1636
1637         if (!oldcard) {
1638                 /*
1639                  * Fetch CSD from card.
1640                  */
1641                 err = mmc_send_csd(card, card->raw_csd);
1642                 if (err)
1643                         goto free_card;
1644
1645                 err = mmc_decode_csd(card);
1646                 if (err)
1647                         goto free_card;
1648                 err = mmc_decode_cid(card);
1649                 if (err)
1650                         goto free_card;
1651         }
1652
1653         /*
1654          * handling only for cards supporting DSR and hosts requesting
1655          * DSR configuration
1656          */
1657         if (card->csd.dsr_imp && host->dsr_req)
1658                 mmc_set_dsr(host);
1659
1660         /*
1661          * Select card, as all following commands rely on that.
1662          */
1663         if (!mmc_host_is_spi(host)) {
1664                 err = mmc_select_card(card);
1665                 if (err)
1666                         goto free_card;
1667         }
1668
1669         if (!oldcard) {
1670                 /* Read extended CSD. */
1671                 err = mmc_read_ext_csd(card);
1672                 if (err)
1673                         goto free_card;
1674
1675                 /*
1676                  * If doing byte addressing, check if required to do sector
1677                  * addressing.  Handle the case of <2GB cards needing sector
1678                  * addressing.  See section 8.1 JEDEC Standard JED84-A441;
1679                  * ocr register has bit 30 set for sector addressing.
1680                  */
1681                 if (rocr & BIT(30))
1682                         mmc_card_set_blockaddr(card);
1683
1684                 /* Erase size depends on CSD and Extended CSD */
1685                 mmc_set_erase_size(card);
1686         }
1687
1688         /* Enable ERASE_GRP_DEF. This bit is lost after a reset or power off. */
1689         if (card->ext_csd.rev >= 3) {
1690                 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
1691                                  EXT_CSD_ERASE_GROUP_DEF, 1,
1692                                  card->ext_csd.generic_cmd6_time);
1693
1694                 if (err && err != -EBADMSG)
1695                         goto free_card;
1696
1697                 if (err) {
1698                         err = 0;
1699                         /*
1700                          * Just disable enhanced area off & sz
1701                          * will try to enable ERASE_GROUP_DEF
1702                          * during next time reinit
1703                          */
1704                         card->ext_csd.enhanced_area_offset = -EINVAL;
1705                         card->ext_csd.enhanced_area_size = -EINVAL;
1706                 } else {
1707                         card->ext_csd.erase_group_def = 1;
1708                         /*
1709                          * enable ERASE_GRP_DEF successfully.
1710                          * This will affect the erase size, so
1711                          * here need to reset erase size
1712                          */
1713                         mmc_set_erase_size(card);
1714                 }
1715         }
1716
1717         /*
1718          * Ensure eMMC user default partition is enabled
1719          */
1720         if (card->ext_csd.part_config & EXT_CSD_PART_CONFIG_ACC_MASK) {
1721                 card->ext_csd.part_config &= ~EXT_CSD_PART_CONFIG_ACC_MASK;
1722                 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL, EXT_CSD_PART_CONFIG,
1723                                  card->ext_csd.part_config,
1724                                  card->ext_csd.part_time);
1725                 if (err && err != -EBADMSG)
1726                         goto free_card;
1727         }
1728
1729         /*
1730          * Enable power_off_notification byte in the ext_csd register
1731          */
1732         if (card->ext_csd.rev >= 6) {
1733                 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
1734                                  EXT_CSD_POWER_OFF_NOTIFICATION,
1735                                  EXT_CSD_POWER_ON,
1736                                  card->ext_csd.generic_cmd6_time);
1737                 if (err && err != -EBADMSG)
1738                         goto free_card;
1739
1740                 /*
1741                  * The err can be -EBADMSG or 0,
1742                  * so check for success and update the flag
1743                  */
1744                 if (!err)
1745                         card->ext_csd.power_off_notification = EXT_CSD_POWER_ON;
1746         }
1747
1748         /* set erase_arg */
1749         if (mmc_can_discard(card))
1750                 card->erase_arg = MMC_DISCARD_ARG;
1751         else if (mmc_can_trim(card))
1752                 card->erase_arg = MMC_TRIM_ARG;
1753         else
1754                 card->erase_arg = MMC_ERASE_ARG;
1755
1756         /*
1757          * Select timing interface
1758          */
1759         err = mmc_select_timing(card);
1760         if (err)
1761                 goto free_card;
1762
1763         if (mmc_card_hs200(card)) {
1764                 err = mmc_hs200_tuning(card);
1765                 if (err)
1766                         goto free_card;
1767
1768                 err = mmc_select_hs400(card);
1769                 if (err)
1770                         goto free_card;
1771         } else if (!mmc_card_hs400es(card)) {
1772                 /* Select the desired bus width optionally */
1773                 err = mmc_select_bus_width(card);
1774                 if (err > 0 && mmc_card_hs(card)) {
1775                         err = mmc_select_hs_ddr(card);
1776                         if (err)
1777                                 goto free_card;
1778                 }
1779         }
1780
1781         /*
1782          * Choose the power class with selected bus interface
1783          */
1784         mmc_select_powerclass(card);
1785
1786         /*
1787          * Enable HPI feature (if supported)
1788          */
1789         if (card->ext_csd.hpi) {
1790                 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
1791                                 EXT_CSD_HPI_MGMT, 1,
1792                                 card->ext_csd.generic_cmd6_time);
1793                 if (err && err != -EBADMSG)
1794                         goto free_card;
1795                 if (err) {
1796                         pr_warn("%s: Enabling HPI failed\n",
1797                                 mmc_hostname(card->host));
1798                         card->ext_csd.hpi_en = 0;
1799                         err = 0;
1800                 } else {
1801                         card->ext_csd.hpi_en = 1;
1802                 }
1803         }
1804
1805         /*
1806          * If cache size is higher than 0, this indicates the existence of cache
1807          * and it can be turned on. Note that some eMMCs from Micron has been
1808          * reported to need ~800 ms timeout, while enabling the cache after
1809          * sudden power failure tests. Let's extend the timeout to a minimum of
1810          * DEFAULT_CACHE_EN_TIMEOUT_MS and do it for all cards.
1811          */
1812         if (card->ext_csd.cache_size > 0) {
1813                 unsigned int timeout_ms = MIN_CACHE_EN_TIMEOUT_MS;
1814
1815                 timeout_ms = max(card->ext_csd.generic_cmd6_time, timeout_ms);
1816                 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
1817                                 EXT_CSD_CACHE_CTRL, 1, timeout_ms);
1818                 if (err && err != -EBADMSG)
1819                         goto free_card;
1820
1821                 /*
1822                  * Only if no error, cache is turned on successfully.
1823                  */
1824                 if (err) {
1825                         pr_warn("%s: Cache is supported, but failed to turn on (%d)\n",
1826                                 mmc_hostname(card->host), err);
1827                         card->ext_csd.cache_ctrl = 0;
1828                         err = 0;
1829                 } else {
1830                         card->ext_csd.cache_ctrl = 1;
1831                 }
1832         }
1833
1834         /*
1835          * Enable Command Queue if supported. Note that Packed Commands cannot
1836          * be used with Command Queue.
1837          */
1838         card->ext_csd.cmdq_en = false;
1839         if (card->ext_csd.cmdq_support && host->caps2 & MMC_CAP2_CQE) {
1840                 err = mmc_cmdq_enable(card);
1841                 if (err && err != -EBADMSG)
1842                         goto free_card;
1843                 if (err) {
1844                         pr_warn("%s: Enabling CMDQ failed\n",
1845                                 mmc_hostname(card->host));
1846                         card->ext_csd.cmdq_support = false;
1847                         card->ext_csd.cmdq_depth = 0;
1848                         err = 0;
1849                 }
1850         }
1851         /*
1852          * In some cases (e.g. RPMB or mmc_test), the Command Queue must be
1853          * disabled for a time, so a flag is needed to indicate to re-enable the
1854          * Command Queue.
1855          */
1856         card->reenable_cmdq = card->ext_csd.cmdq_en;
1857
1858         if (card->ext_csd.cmdq_en && !host->cqe_enabled) {
1859                 err = host->cqe_ops->cqe_enable(host, card);
1860                 if (err) {
1861                         pr_err("%s: Failed to enable CQE, error %d\n",
1862                                 mmc_hostname(host), err);
1863                 } else {
1864                         host->cqe_enabled = true;
1865                         pr_info("%s: Command Queue Engine enabled\n",
1866                                 mmc_hostname(host));
1867                 }
1868         }
1869
1870         if (host->caps2 & MMC_CAP2_AVOID_3_3V &&
1871             host->ios.signal_voltage == MMC_SIGNAL_VOLTAGE_330) {
1872                 pr_err("%s: Host failed to negotiate down from 3.3V\n",
1873                         mmc_hostname(host));
1874                 err = -EINVAL;
1875                 goto free_card;
1876         }
1877
1878         if (!oldcard)
1879                 host->card = card;
1880
1881         return 0;
1882
1883 free_card:
1884         if (!oldcard)
1885                 mmc_remove_card(card);
1886 err:
1887         return err;
1888 }
1889
1890 static int mmc_can_sleep(struct mmc_card *card)
1891 {
1892         return (card && card->ext_csd.rev >= 3);
1893 }
1894
1895 static int mmc_sleep(struct mmc_host *host)
1896 {
1897         struct mmc_command cmd = {};
1898         struct mmc_card *card = host->card;
1899         unsigned int timeout_ms = DIV_ROUND_UP(card->ext_csd.sa_timeout, 10000);
1900         int err;
1901
1902         /* Re-tuning can't be done once the card is deselected */
1903         mmc_retune_hold(host);
1904
1905         err = mmc_deselect_cards(host);
1906         if (err)
1907                 goto out_release;
1908
1909         cmd.opcode = MMC_SLEEP_AWAKE;
1910         cmd.arg = card->rca << 16;
1911         cmd.arg |= 1 << 15;
1912
1913         /*
1914          * If the max_busy_timeout of the host is specified, validate it against
1915          * the sleep cmd timeout. A failure means we need to prevent the host
1916          * from doing hw busy detection, which is done by converting to a R1
1917          * response instead of a R1B.
1918          */
1919         if (host->max_busy_timeout && (timeout_ms > host->max_busy_timeout)) {
1920                 cmd.flags = MMC_RSP_R1 | MMC_CMD_AC;
1921         } else {
1922                 cmd.flags = MMC_RSP_R1B | MMC_CMD_AC;
1923                 cmd.busy_timeout = timeout_ms;
1924         }
1925
1926         err = mmc_wait_for_cmd(host, &cmd, 0);
1927         if (err)
1928                 goto out_release;
1929
1930         /*
1931          * If the host does not wait while the card signals busy, then we will
1932          * will have to wait the sleep/awake timeout.  Note, we cannot use the
1933          * SEND_STATUS command to poll the status because that command (and most
1934          * others) is invalid while the card sleeps.
1935          */
1936         if (!cmd.busy_timeout || !(host->caps & MMC_CAP_WAIT_WHILE_BUSY))
1937                 mmc_delay(timeout_ms);
1938
1939 out_release:
1940         mmc_retune_release(host);
1941         return err;
1942 }
1943
1944 static int mmc_can_poweroff_notify(const struct mmc_card *card)
1945 {
1946         return card &&
1947                 mmc_card_mmc(card) &&
1948                 (card->ext_csd.power_off_notification == EXT_CSD_POWER_ON);
1949 }
1950
1951 static int mmc_poweroff_notify(struct mmc_card *card, unsigned int notify_type)
1952 {
1953         unsigned int timeout = card->ext_csd.generic_cmd6_time;
1954         int err;
1955
1956         /* Use EXT_CSD_POWER_OFF_SHORT as default notification type. */
1957         if (notify_type == EXT_CSD_POWER_OFF_LONG)
1958                 timeout = card->ext_csd.power_off_longtime;
1959
1960         err = __mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
1961                         EXT_CSD_POWER_OFF_NOTIFICATION,
1962                         notify_type, timeout, 0, true, false, false);
1963         if (err)
1964                 pr_err("%s: Power Off Notification timed out, %u\n",
1965                        mmc_hostname(card->host), timeout);
1966
1967         /* Disable the power off notification after the switch operation. */
1968         card->ext_csd.power_off_notification = EXT_CSD_NO_POWER_NOTIFICATION;
1969
1970         return err;
1971 }
1972
1973 /*
1974  * Host is being removed. Free up the current card.
1975  */
1976 static void mmc_remove(struct mmc_host *host)
1977 {
1978         mmc_remove_card(host->card);
1979         host->card = NULL;
1980 }
1981
1982 /*
1983  * Card detection - card is alive.
1984  */
1985 static int mmc_alive(struct mmc_host *host)
1986 {
1987         return mmc_send_status(host->card, NULL);
1988 }
1989
1990 /*
1991  * Card detection callback from host.
1992  */
1993 static void mmc_detect(struct mmc_host *host)
1994 {
1995         int err;
1996
1997         mmc_get_card(host->card, NULL);
1998
1999         /*
2000          * Just check if our card has been removed.
2001          */
2002         err = _mmc_detect_card_removed(host);
2003
2004         mmc_put_card(host->card, NULL);
2005
2006         if (err) {
2007                 mmc_remove(host);
2008
2009                 mmc_claim_host(host);
2010                 mmc_detach_bus(host);
2011                 mmc_power_off(host);
2012                 mmc_release_host(host);
2013         }
2014 }
2015
2016 static int _mmc_suspend(struct mmc_host *host, bool is_suspend)
2017 {
2018         int err = 0;
2019         unsigned int notify_type = is_suspend ? EXT_CSD_POWER_OFF_SHORT :
2020                                         EXT_CSD_POWER_OFF_LONG;
2021
2022         mmc_claim_host(host);
2023
2024         if (mmc_card_suspended(host->card))
2025                 goto out;
2026
2027         err = mmc_flush_cache(host->card);
2028         if (err)
2029                 goto out;
2030
2031         if (mmc_can_poweroff_notify(host->card) &&
2032                 ((host->caps2 & MMC_CAP2_FULL_PWR_CYCLE) || !is_suspend))
2033                 err = mmc_poweroff_notify(host->card, notify_type);
2034         else if (mmc_can_sleep(host->card))
2035                 err = mmc_sleep(host);
2036         else if (!mmc_host_is_spi(host))
2037                 err = mmc_deselect_cards(host);
2038
2039         if (!err) {
2040                 mmc_power_off(host);
2041                 mmc_card_set_suspended(host->card);
2042         }
2043 out:
2044         mmc_release_host(host);
2045         return err;
2046 }
2047
2048 /*
2049  * Suspend callback
2050  */
2051 static int mmc_suspend(struct mmc_host *host)
2052 {
2053         int err;
2054
2055         err = _mmc_suspend(host, true);
2056         if (!err) {
2057                 pm_runtime_disable(&host->card->dev);
2058                 pm_runtime_set_suspended(&host->card->dev);
2059         }
2060
2061         return err;
2062 }
2063
2064 /*
2065  * This function tries to determine if the same card is still present
2066  * and, if so, restore all state to it.
2067  */
2068 static int _mmc_resume(struct mmc_host *host)
2069 {
2070         int err = 0;
2071
2072         mmc_claim_host(host);
2073
2074         if (!mmc_card_suspended(host->card))
2075                 goto out;
2076
2077         mmc_power_up(host, host->card->ocr);
2078         err = mmc_init_card(host, host->card->ocr, host->card);
2079         mmc_card_clr_suspended(host->card);
2080
2081 out:
2082         mmc_release_host(host);
2083         return err;
2084 }
2085
2086 /*
2087  * Shutdown callback
2088  */
2089 static int mmc_shutdown(struct mmc_host *host)
2090 {
2091         int err = 0;
2092
2093         /*
2094          * In a specific case for poweroff notify, we need to resume the card
2095          * before we can shutdown it properly.
2096          */
2097         if (mmc_can_poweroff_notify(host->card) &&
2098                 !(host->caps2 & MMC_CAP2_FULL_PWR_CYCLE))
2099                 err = _mmc_resume(host);
2100
2101         if (!err)
2102                 err = _mmc_suspend(host, false);
2103
2104         return err;
2105 }
2106
2107 /*
2108  * Callback for resume.
2109  */
2110 static int mmc_resume(struct mmc_host *host)
2111 {
2112         pm_runtime_enable(&host->card->dev);
2113         return 0;
2114 }
2115
2116 /*
2117  * Callback for runtime_suspend.
2118  */
2119 static int mmc_runtime_suspend(struct mmc_host *host)
2120 {
2121         int err;
2122
2123         if (!(host->caps & MMC_CAP_AGGRESSIVE_PM))
2124                 return 0;
2125
2126         err = _mmc_suspend(host, true);
2127         if (err)
2128                 pr_err("%s: error %d doing aggressive suspend\n",
2129                         mmc_hostname(host), err);
2130
2131         return err;
2132 }
2133
2134 /*
2135  * Callback for runtime_resume.
2136  */
2137 static int mmc_runtime_resume(struct mmc_host *host)
2138 {
2139         int err;
2140
2141         err = _mmc_resume(host);
2142         if (err && err != -ENOMEDIUM)
2143                 pr_err("%s: error %d doing runtime resume\n",
2144                         mmc_hostname(host), err);
2145
2146         return 0;
2147 }
2148
2149 static int mmc_can_reset(struct mmc_card *card)
2150 {
2151         u8 rst_n_function;
2152
2153         rst_n_function = card->ext_csd.rst_n_function;
2154         if ((rst_n_function & EXT_CSD_RST_N_EN_MASK) != EXT_CSD_RST_N_ENABLED)
2155                 return 0;
2156         return 1;
2157 }
2158
2159 static int _mmc_hw_reset(struct mmc_host *host)
2160 {
2161         struct mmc_card *card = host->card;
2162
2163         /*
2164          * In the case of recovery, we can't expect flushing the cache to work
2165          * always, but we have a go and ignore errors.
2166          */
2167         mmc_flush_cache(host->card);
2168
2169         if ((host->caps & MMC_CAP_HW_RESET) && host->ops->hw_reset &&
2170              mmc_can_reset(card)) {
2171                 /* If the card accept RST_n signal, send it. */
2172                 mmc_set_clock(host, host->f_init);
2173                 host->ops->hw_reset(host);
2174                 /* Set initial state and call mmc_set_ios */
2175                 mmc_set_initial_state(host);
2176         } else {
2177                 /* Do a brute force power cycle */
2178                 mmc_power_cycle(host, card->ocr);
2179                 mmc_pwrseq_reset(host);
2180         }
2181         return mmc_init_card(host, card->ocr, card);
2182 }
2183
2184 static const struct mmc_bus_ops mmc_ops = {
2185         .remove = mmc_remove,
2186         .detect = mmc_detect,
2187         .suspend = mmc_suspend,
2188         .resume = mmc_resume,
2189         .runtime_suspend = mmc_runtime_suspend,
2190         .runtime_resume = mmc_runtime_resume,
2191         .alive = mmc_alive,
2192         .shutdown = mmc_shutdown,
2193         .hw_reset = _mmc_hw_reset,
2194 };
2195
2196 /*
2197  * Starting point for MMC card init.
2198  */
2199 int mmc_attach_mmc(struct mmc_host *host)
2200 {
2201         int err;
2202         u32 ocr, rocr;
2203
2204         WARN_ON(!host->claimed);
2205
2206         /* Set correct bus mode for MMC before attempting attach */
2207         if (!mmc_host_is_spi(host))
2208                 mmc_set_bus_mode(host, MMC_BUSMODE_OPENDRAIN);
2209
2210         err = mmc_send_op_cond(host, 0, &ocr);
2211         if (err)
2212                 return err;
2213
2214         mmc_attach_bus(host, &mmc_ops);
2215         if (host->ocr_avail_mmc)
2216                 host->ocr_avail = host->ocr_avail_mmc;
2217
2218         /*
2219          * We need to get OCR a different way for SPI.
2220          */
2221         if (mmc_host_is_spi(host)) {
2222                 err = mmc_spi_read_ocr(host, 1, &ocr);
2223                 if (err)
2224                         goto err;
2225         }
2226
2227         rocr = mmc_select_voltage(host, ocr);
2228
2229         /*
2230          * Can we support the voltage of the card?
2231          */
2232         if (!rocr) {
2233                 err = -EINVAL;
2234                 goto err;
2235         }
2236
2237         /*
2238          * Detect and init the card.
2239          */
2240         err = mmc_init_card(host, rocr, NULL);
2241         if (err)
2242                 goto err;
2243
2244         mmc_release_host(host);
2245         err = mmc_add_card(host->card);
2246         if (err)
2247                 goto remove_card;
2248
2249         mmc_claim_host(host);
2250         return 0;
2251
2252 remove_card:
2253         mmc_remove_card(host->card);
2254         mmc_claim_host(host);
2255         host->card = NULL;
2256 err:
2257         mmc_detach_bus(host);
2258
2259         pr_err("%s: error %d whilst initialising MMC card\n",
2260                 mmc_hostname(host), err);
2261
2262         return err;
2263 }