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 "host.h"
  25 #include "bus.h"
  26 #include "mmc_ops.h"
  27 #include "sd_ops.h"
  28
  29 static const unsigned int tran_exp[] = {
  30         10000,          100000,         1000000,        10000000,
  31         0,              0,              0,              0
  32 };
  33
  34 static const unsigned char tran_mant[] = {
  35         0,      10,     12,     13,     15,     20,     25,     30,
  36         35,     40,     45,     50,     55,     60,     70,     80,
  37 };
  38
  39 static const unsigned int tacc_exp[] = {
  40         1,      10,     100,    1000,   10000,  100000, 1000000, 10000000,
  41 };
  42
  43 static const unsigned int tacc_mant[] = {
  44         0,      10,     12,     13,     15,     20,     25,     30,
  45         35,     40,     45,     50,     55,     60,     70,     80,
  46 };
  47
  48 #define UNSTUFF_BITS(resp,start,size)                                   \
  49         ({                                                              \
  50                 const int __size = size;                                \
  51                 const u32 __mask = (__size < 32 ? 1 << __size : 0) - 1; \
  52                 const int __off = 3 - ((start) / 32);                   \
  53                 const int __shft = (start) & 31;                        \
  54                 u32 __res;                                              \
  55                                                                         \
  56                 __res = resp[__off] >> __shft;                          \
  57                 if (__size + __shft > 32)                               \
  58                         __res |= resp[__off-1] << ((32 - __shft) % 32); \
  59                 __res & __mask;                                         \
  60         })
  61
  62 /*
  63  * Given the decoded CSD structure, decode the raw CID to our CID structure.
  64  */
  65 static int mmc_decode_cid(struct mmc_card *card)
  66 {
  67         u32 *resp = card->raw_cid;
  68
  69         /*
  70          * The selection of the format here is based upon published
  71          * specs from sandisk and from what people have reported.
  72          */
  73         switch (card->csd.mmca_vsn) {
  74         case 0: /* MMC v1.0 - v1.2 */
  75         case 1: /* MMC v1.4 */
  76                 card->cid.manfid        = UNSTUFF_BITS(resp, 104, 24);
  77                 card->cid.prod_name[0]  = UNSTUFF_BITS(resp, 96, 8);
  78                 card->cid.prod_name[1]  = UNSTUFF_BITS(resp, 88, 8);
  79                 card->cid.prod_name[2]  = UNSTUFF_BITS(resp, 80, 8);
  80                 card->cid.prod_name[3]  = UNSTUFF_BITS(resp, 72, 8);
  81                 card->cid.prod_name[4]  = UNSTUFF_BITS(resp, 64, 8);
  82                 card->cid.prod_name[5]  = UNSTUFF_BITS(resp, 56, 8);
  83                 card->cid.prod_name[6]  = UNSTUFF_BITS(resp, 48, 8);
  84                 card->cid.hwrev         = UNSTUFF_BITS(resp, 44, 4);
  85                 card->cid.fwrev         = UNSTUFF_BITS(resp, 40, 4);
  86                 card->cid.serial        = UNSTUFF_BITS(resp, 16, 24);
  87                 card->cid.month         = UNSTUFF_BITS(resp, 12, 4);
  88                 card->cid.year          = UNSTUFF_BITS(resp, 8, 4) + 1997;
  89                 break;
  90
  91         case 2: /* MMC v2.0 - v2.2 */
  92         case 3: /* MMC v3.1 - v3.3 */
  93         case 4: /* MMC v4 */
  94                 card->cid.manfid        = UNSTUFF_BITS(resp, 120, 8);
  95                 card->cid.oemid         = UNSTUFF_BITS(resp, 104, 16);
  96                 card->cid.prod_name[0]  = UNSTUFF_BITS(resp, 96, 8);
  97                 card->cid.prod_name[1]  = UNSTUFF_BITS(resp, 88, 8);
  98                 card->cid.prod_name[2]  = UNSTUFF_BITS(resp, 80, 8);
  99                 card->cid.prod_name[3]  = UNSTUFF_BITS(resp, 72, 8);
 100                 card->cid.prod_name[4]  = UNSTUFF_BITS(resp, 64, 8);
 101                 card->cid.prod_name[5]  = UNSTUFF_BITS(resp, 56, 8);
 102                 card->cid.prv           = UNSTUFF_BITS(resp, 48, 8);
 103                 card->cid.serial        = UNSTUFF_BITS(resp, 16, 32);
 104                 card->cid.month         = UNSTUFF_BITS(resp, 12, 4);
 105                 card->cid.year          = UNSTUFF_BITS(resp, 8, 4) + 1997;
 106                 break;
 107
 108         default:
 109                 pr_err("%s: card has unknown MMCA version %d\n",
 110                         mmc_hostname(card->host), card->csd.mmca_vsn);
 111                 return -EINVAL;
 112         }
 113
 114         return 0;
 115 }
 116
 117 static void mmc_set_erase_size(struct mmc_card *card)
 118 {
 119         if (card->ext_csd.erase_group_def & 1)
 120                 card->erase_size = card->ext_csd.hc_erase_size;
 121         else
 122                 card->erase_size = card->csd.erase_size;
 123
 124         mmc_init_erase(card);
 125 }
 126
 127 /*
 128  * Given a 128-bit response, decode to our card CSD structure.
 129  */
 130 static int mmc_decode_csd(struct mmc_card *card)
 131 {
 132         struct mmc_csd *csd = &card->csd;
 133         unsigned int e, m, a, b;
 134         u32 *resp = card->raw_csd;
 135
 136         /*
 137          * We only understand CSD structure v1.1 and v1.2.
 138          * v1.2 has extra information in bits 15, 11 and 10.
 139          * We also support eMMC v4.4 & v4.41.
 140          */
 141         csd->structure = UNSTUFF_BITS(resp, 126, 2);
 142         if (csd->structure == 0) {
 143                 pr_err("%s: unrecognised CSD structure version %d\n",
 144                         mmc_hostname(card->host), csd->structure);
 145                 return -EINVAL;
 146         }
 147
 148         csd->mmca_vsn    = UNSTUFF_BITS(resp, 122, 4);
 149         m = UNSTUFF_BITS(resp, 115, 4);
 150         e = UNSTUFF_BITS(resp, 112, 3);
 151         csd->tacc_ns     = (tacc_exp[e] * tacc_mant[m] + 9) / 10;
 152         csd->tacc_clks   = UNSTUFF_BITS(resp, 104, 8) * 100;
 153
 154         m = UNSTUFF_BITS(resp, 99, 4);
 155         e = UNSTUFF_BITS(resp, 96, 3);
 156         csd->max_dtr      = tran_exp[e] * tran_mant[m];
 157         csd->cmdclass     = UNSTUFF_BITS(resp, 84, 12);
 158
 159         e = UNSTUFF_BITS(resp, 47, 3);
 160         m = UNSTUFF_BITS(resp, 62, 12);
 161         csd->capacity     = (1 + m) << (e + 2);
 162
 163         csd->read_blkbits = UNSTUFF_BITS(resp, 80, 4);
 164         csd->read_partial = UNSTUFF_BITS(resp, 79, 1);
 165         csd->write_misalign = UNSTUFF_BITS(resp, 78, 1);
 166         csd->read_misalign = UNSTUFF_BITS(resp, 77, 1);
 167         csd->dsr_imp = UNSTUFF_BITS(resp, 76, 1);
 168         csd->r2w_factor = UNSTUFF_BITS(resp, 26, 3);
 169         csd->write_blkbits = UNSTUFF_BITS(resp, 22, 4);
 170         csd->write_partial = UNSTUFF_BITS(resp, 21, 1);
 171
 172         if (csd->write_blkbits >= 9) {
 173                 a = UNSTUFF_BITS(resp, 42, 5);
 174                 b = UNSTUFF_BITS(resp, 37, 5);
 175                 csd->erase_size = (a + 1) * (b + 1);
 176                 csd->erase_size <<= csd->write_blkbits - 9;
 177         }
 178
 179         return 0;
 180 }
 181
 182 static void mmc_select_card_type(struct mmc_card *card)
 183 {
 184         struct mmc_host *host = card->host;
 185         u8 card_type = card->ext_csd.raw_card_type;
 186         u32 caps = host->caps, caps2 = host->caps2;
 187         unsigned int hs_max_dtr = 0, hs200_max_dtr = 0;
 188         unsigned int avail_type = 0;
 189
 190         if (caps & MMC_CAP_MMC_HIGHSPEED &&
 191             card_type & EXT_CSD_CARD_TYPE_HS_26) {
 192                 hs_max_dtr = MMC_HIGH_26_MAX_DTR;
 193                 avail_type |= EXT_CSD_CARD_TYPE_HS_26;
 194         }
 195
 196         if (caps & MMC_CAP_MMC_HIGHSPEED &&
 197             card_type & EXT_CSD_CARD_TYPE_HS_52) {
 198                 hs_max_dtr = MMC_HIGH_52_MAX_DTR;
 199                 avail_type |= EXT_CSD_CARD_TYPE_HS_52;
 200         }
 201
 202         if (caps & MMC_CAP_1_8V_DDR &&
 203             card_type & EXT_CSD_CARD_TYPE_DDR_1_8V) {
 204                 hs_max_dtr = MMC_HIGH_DDR_MAX_DTR;
 205                 avail_type |= EXT_CSD_CARD_TYPE_DDR_1_8V;
 206         }
 207
 208         if (caps & MMC_CAP_1_2V_DDR &&
 209             card_type & EXT_CSD_CARD_TYPE_DDR_1_2V) {
 210                 hs_max_dtr = MMC_HIGH_DDR_MAX_DTR;
 211                 avail_type |= EXT_CSD_CARD_TYPE_DDR_1_2V;
 212         }
 213
 214         if (caps2 & MMC_CAP2_HS200_1_8V_SDR &&
 215             card_type & EXT_CSD_CARD_TYPE_HS200_1_8V) {
 216                 hs200_max_dtr = MMC_HS200_MAX_DTR;
 217                 avail_type |= EXT_CSD_CARD_TYPE_HS200_1_8V;
 218         }
 219
 220         if (caps2 & MMC_CAP2_HS200_1_2V_SDR &&
 221             card_type & EXT_CSD_CARD_TYPE_HS200_1_2V) {
 222                 hs200_max_dtr = MMC_HS200_MAX_DTR;
 223                 avail_type |= EXT_CSD_CARD_TYPE_HS200_1_2V;
 224         }
 225
 226         if (caps2 & MMC_CAP2_HS400_1_8V &&
 227             card_type & EXT_CSD_CARD_TYPE_HS400_1_8V) {
 228                 hs200_max_dtr = MMC_HS200_MAX_DTR;
 229                 avail_type |= EXT_CSD_CARD_TYPE_HS400_1_8V;
 230         }
 231
 232         if (caps2 & MMC_CAP2_HS400_1_2V &&
 233             card_type & EXT_CSD_CARD_TYPE_HS400_1_2V) {
 234                 hs200_max_dtr = MMC_HS200_MAX_DTR;
 235                 avail_type |= EXT_CSD_CARD_TYPE_HS400_1_2V;
 236         }
 237
 238         card->ext_csd.hs_max_dtr = hs_max_dtr;
 239         card->ext_csd.hs200_max_dtr = hs200_max_dtr;
 240         card->mmc_avail_type = avail_type;
 241 }
 242
 243 static void mmc_manage_enhanced_area(struct mmc_card *card, u8 *ext_csd)
 244 {
 245         u8 hc_erase_grp_sz, hc_wp_grp_sz;
 246
 247         /*
 248          * Disable these attributes by default
 249          */
 250         card->ext_csd.enhanced_area_offset = -EINVAL;
 251         card->ext_csd.enhanced_area_size = -EINVAL;
 252
 253         /*
 254          * Enhanced area feature support -- check whether the eMMC
 255          * card has the Enhanced area enabled.  If so, export enhanced
 256          * area offset and size to user by adding sysfs interface.
 257          */
 258         if ((ext_csd[EXT_CSD_PARTITION_SUPPORT] & 0x2) &&
 259             (ext_csd[EXT_CSD_PARTITION_ATTRIBUTE] & 0x1)) {
 260                 if (card->ext_csd.partition_setting_completed) {
 261                         hc_erase_grp_sz =
 262                                 ext_csd[EXT_CSD_HC_ERASE_GRP_SIZE];
 263                         hc_wp_grp_sz =
 264                                 ext_csd[EXT_CSD_HC_WP_GRP_SIZE];
 265
 266                         /*
 267                          * calculate the enhanced data area offset, in bytes
 268                          */
 269                         card->ext_csd.enhanced_area_offset =
 270                                 (((unsigned long long)ext_csd[139]) << 24) +
 271                                 (((unsigned long long)ext_csd[138]) << 16) +
 272                                 (((unsigned long long)ext_csd[137]) << 8) +
 273                                 (((unsigned long long)ext_csd[136]));
 274                         if (mmc_card_blockaddr(card))
 275                                 card->ext_csd.enhanced_area_offset <<= 9;
 276                         /*
 277                          * calculate the enhanced data area size, in kilobytes
 278                          */
 279                         card->ext_csd.enhanced_area_size =
 280                                 (ext_csd[142] << 16) + (ext_csd[141] << 8) +
 281                                 ext_csd[140];
 282                         card->ext_csd.enhanced_area_size *=
 283                                 (size_t)(hc_erase_grp_sz * hc_wp_grp_sz);
 284                         card->ext_csd.enhanced_area_size <<= 9;
 285                 } else {
 286                         pr_warn("%s: defines enhanced area without partition setting complete\n",
 287                                 mmc_hostname(card->host));
 288                 }
 289         }
 290 }
 291
 292 static void mmc_manage_gp_partitions(struct mmc_card *card, u8 *ext_csd)
 293 {
 294         int idx;
 295         u8 hc_erase_grp_sz, hc_wp_grp_sz;
 296         unsigned int part_size;
 297
 298         /*
 299          * General purpose partition feature support --
 300          * If ext_csd has the size of general purpose partitions,
 301          * set size, part_cfg, partition name in mmc_part.
 302          */
 303         if (ext_csd[EXT_CSD_PARTITION_SUPPORT] &
 304             EXT_CSD_PART_SUPPORT_PART_EN) {
 305                 hc_erase_grp_sz =
 306                         ext_csd[EXT_CSD_HC_ERASE_GRP_SIZE];
 307                 hc_wp_grp_sz =
 308                         ext_csd[EXT_CSD_HC_WP_GRP_SIZE];
 309
 310                 for (idx = 0; idx < MMC_NUM_GP_PARTITION; idx++) {
 311                         if (!ext_csd[EXT_CSD_GP_SIZE_MULT + idx * 3] &&
 312                             !ext_csd[EXT_CSD_GP_SIZE_MULT + idx * 3 + 1] &&
 313                             !ext_csd[EXT_CSD_GP_SIZE_MULT + idx * 3 + 2])
 314                                 continue;
 315                         if (card->ext_csd.partition_setting_completed == 0) {
 316                                 pr_warn("%s: has partition size defined without partition complete\n",
 317                                         mmc_hostname(card->host));
 318                                 break;
 319                         }
 320                         part_size =
 321                                 (ext_csd[EXT_CSD_GP_SIZE_MULT + idx * 3 + 2]
 322                                 << 16) +
 323                                 (ext_csd[EXT_CSD_GP_SIZE_MULT + idx * 3 + 1]
 324                                 << 8) +
 325                                 ext_csd[EXT_CSD_GP_SIZE_MULT + idx * 3];
 326                         part_size *= (size_t)(hc_erase_grp_sz *
 327                                 hc_wp_grp_sz);
 328                         mmc_part_add(card, part_size << 19,
 329                                 EXT_CSD_PART_CONFIG_ACC_GP0 + idx,
 330                                 "gp%d", idx, false,
 331                                 MMC_BLK_DATA_AREA_GP);
 332                 }
 333         }
 334 }
 335
 336 /*
 337  * Decode extended CSD.
 338  */
 339 static int mmc_decode_ext_csd(struct mmc_card *card, u8 *ext_csd)
 340 {
 341         int err = 0, idx;
 342         unsigned int part_size;
 343         struct device_node *np;
 344         bool broken_hpi = false;
 345
 346         /* Version is coded in the CSD_STRUCTURE byte in the EXT_CSD register */
 347         card->ext_csd.raw_ext_csd_structure = ext_csd[EXT_CSD_STRUCTURE];
 348         if (card->csd.structure == 3) {
 349                 if (card->ext_csd.raw_ext_csd_structure > 2) {
 350                         pr_err("%s: unrecognised EXT_CSD structure "
 351                                 "version %d\n", mmc_hostname(card->host),
 352                                         card->ext_csd.raw_ext_csd_structure);
 353                         err = -EINVAL;
 354                         goto out;
 355                 }
 356         }
 357
 358         np = mmc_of_find_child_device(card->host, 0);
 359         if (np && of_device_is_compatible(np, "mmc-card"))
 360                 broken_hpi = of_property_read_bool(np, "broken-hpi");
 361         of_node_put(np);
 362
 363         /*
 364          * The EXT_CSD format is meant to be forward compatible. As long
 365          * as CSD_STRUCTURE does not change, all values for EXT_CSD_REV
 366          * are authorized, see JEDEC JESD84-B50 section B.8.
 367          */
 368         card->ext_csd.rev = ext_csd[EXT_CSD_REV];
 369
 370         card->ext_csd.raw_sectors[0] = ext_csd[EXT_CSD_SEC_CNT + 0];
 371         card->ext_csd.raw_sectors[1] = ext_csd[EXT_CSD_SEC_CNT + 1];
 372         card->ext_csd.raw_sectors[2] = ext_csd[EXT_CSD_SEC_CNT + 2];
 373         card->ext_csd.raw_sectors[3] = ext_csd[EXT_CSD_SEC_CNT + 3];
 374         if (card->ext_csd.rev >= 2) {
 375                 card->ext_csd.sectors =
 376                         ext_csd[EXT_CSD_SEC_CNT + 0] << 0 |
 377                         ext_csd[EXT_CSD_SEC_CNT + 1] << 8 |
 378                         ext_csd[EXT_CSD_SEC_CNT + 2] << 16 |
 379                         ext_csd[EXT_CSD_SEC_CNT + 3] << 24;
 380
 381                 /* Cards with density > 2GiB are sector addressed */
 382                 if (card->ext_csd.sectors > (2u * 1024 * 1024 * 1024) / 512)
 383                         mmc_card_set_blockaddr(card);
 384         }
 385
 386         card->ext_csd.raw_card_type = ext_csd[EXT_CSD_CARD_TYPE];
 387         mmc_select_card_type(card);
 388
 389         card->ext_csd.raw_s_a_timeout = ext_csd[EXT_CSD_S_A_TIMEOUT];
 390         card->ext_csd.raw_erase_timeout_mult =
 391                 ext_csd[EXT_CSD_ERASE_TIMEOUT_MULT];
 392         card->ext_csd.raw_hc_erase_grp_size =
 393                 ext_csd[EXT_CSD_HC_ERASE_GRP_SIZE];
 394         if (card->ext_csd.rev >= 3) {
 395                 u8 sa_shift = ext_csd[EXT_CSD_S_A_TIMEOUT];
 396                 card->ext_csd.part_config = ext_csd[EXT_CSD_PART_CONFIG];
 397
 398                 /* EXT_CSD value is in units of 10ms, but we store in ms */
 399                 card->ext_csd.part_time = 10 * ext_csd[EXT_CSD_PART_SWITCH_TIME];
 400
 401                 /* Sleep / awake timeout in 100ns units */
 402                 if (sa_shift > 0 && sa_shift <= 0x17)
 403                         card->ext_csd.sa_timeout =
 404                                         1 << ext_csd[EXT_CSD_S_A_TIMEOUT];
 405                 card->ext_csd.erase_group_def =
 406                         ext_csd[EXT_CSD_ERASE_GROUP_DEF];
 407                 card->ext_csd.hc_erase_timeout = 300 *
 408                         ext_csd[EXT_CSD_ERASE_TIMEOUT_MULT];
 409                 card->ext_csd.hc_erase_size =
 410                         ext_csd[EXT_CSD_HC_ERASE_GRP_SIZE] << 10;
 411
 412                 card->ext_csd.rel_sectors = ext_csd[EXT_CSD_REL_WR_SEC_C];
 413
 414                 /*
 415                  * There are two boot regions of equal size, defined in
 416                  * multiples of 128K.
 417                  */
 418                 if (ext_csd[EXT_CSD_BOOT_MULT] && mmc_boot_partition_access(card->host)) {
 419                         for (idx = 0; idx < MMC_NUM_BOOT_PARTITION; idx++) {
 420                                 part_size = ext_csd[EXT_CSD_BOOT_MULT] << 17;
 421                                 mmc_part_add(card, part_size,
 422                                         EXT_CSD_PART_CONFIG_ACC_BOOT0 + idx,
 423                                         "boot%d", idx, true,
 424                                         MMC_BLK_DATA_AREA_BOOT);
 425                         }
 426                 }
 427         }
 428
 429         card->ext_csd.raw_hc_erase_gap_size =
 430                 ext_csd[EXT_CSD_HC_WP_GRP_SIZE];
 431         card->ext_csd.raw_sec_trim_mult =
 432                 ext_csd[EXT_CSD_SEC_TRIM_MULT];
 433         card->ext_csd.raw_sec_erase_mult =
 434                 ext_csd[EXT_CSD_SEC_ERASE_MULT];
 435         card->ext_csd.raw_sec_feature_support =
 436                 ext_csd[EXT_CSD_SEC_FEATURE_SUPPORT];
 437         card->ext_csd.raw_trim_mult =
 438                 ext_csd[EXT_CSD_TRIM_MULT];
 439         card->ext_csd.raw_partition_support = ext_csd[EXT_CSD_PARTITION_SUPPORT];
 440         card->ext_csd.raw_driver_strength = ext_csd[EXT_CSD_DRIVER_STRENGTH];
 441         if (card->ext_csd.rev >= 4) {
 442                 if (ext_csd[EXT_CSD_PARTITION_SETTING_COMPLETED] &
 443                     EXT_CSD_PART_SETTING_COMPLETED)
 444                         card->ext_csd.partition_setting_completed = 1;
 445                 else
 446                         card->ext_csd.partition_setting_completed = 0;
 447
 448                 mmc_manage_enhanced_area(card, ext_csd);
 449
 450                 mmc_manage_gp_partitions(card, ext_csd);
 451
 452                 card->ext_csd.sec_trim_mult =
 453                         ext_csd[EXT_CSD_SEC_TRIM_MULT];
 454                 card->ext_csd.sec_erase_mult =
 455                         ext_csd[EXT_CSD_SEC_ERASE_MULT];
 456                 card->ext_csd.sec_feature_support =
 457                         ext_csd[EXT_CSD_SEC_FEATURE_SUPPORT];
 458                 card->ext_csd.trim_timeout = 300 *
 459                         ext_csd[EXT_CSD_TRIM_MULT];
 460
 461                 /*
 462                  * Note that the call to mmc_part_add above defaults to read
 463                  * only. If this default assumption is changed, the call must
 464                  * take into account the value of boot_locked below.
 465                  */
 466                 card->ext_csd.boot_ro_lock = ext_csd[EXT_CSD_BOOT_WP];
 467                 card->ext_csd.boot_ro_lockable = true;
 468
 469                 /* Save power class values */
 470                 card->ext_csd.raw_pwr_cl_52_195 =
 471                         ext_csd[EXT_CSD_PWR_CL_52_195];
 472                 card->ext_csd.raw_pwr_cl_26_195 =
 473                         ext_csd[EXT_CSD_PWR_CL_26_195];
 474                 card->ext_csd.raw_pwr_cl_52_360 =
 475                         ext_csd[EXT_CSD_PWR_CL_52_360];
 476                 card->ext_csd.raw_pwr_cl_26_360 =
 477                         ext_csd[EXT_CSD_PWR_CL_26_360];
 478                 card->ext_csd.raw_pwr_cl_200_195 =
 479                         ext_csd[EXT_CSD_PWR_CL_200_195];
 480                 card->ext_csd.raw_pwr_cl_200_360 =
 481                         ext_csd[EXT_CSD_PWR_CL_200_360];
 482                 card->ext_csd.raw_pwr_cl_ddr_52_195 =
 483                         ext_csd[EXT_CSD_PWR_CL_DDR_52_195];
 484                 card->ext_csd.raw_pwr_cl_ddr_52_360 =
 485                         ext_csd[EXT_CSD_PWR_CL_DDR_52_360];
 486                 card->ext_csd.raw_pwr_cl_ddr_200_360 =
 487                         ext_csd[EXT_CSD_PWR_CL_DDR_200_360];
 488         }
 489
 490         if (card->ext_csd.rev >= 5) {
 491                 /* Adjust production date as per JEDEC JESD84-B451 */
 492                 if (card->cid.year < 2010)
 493                         card->cid.year += 16;
 494
 495                 /* check whether the eMMC card supports BKOPS */
 496                 if (ext_csd[EXT_CSD_BKOPS_SUPPORT] & 0x1) {
 497                         card->ext_csd.bkops = 1;
 498                         card->ext_csd.man_bkops_en =
 499                                         (ext_csd[EXT_CSD_BKOPS_EN] &
 500                                                 EXT_CSD_MANUAL_BKOPS_MASK);
 501                         card->ext_csd.raw_bkops_status =
 502                                 ext_csd[EXT_CSD_BKOPS_STATUS];
 503                         if (!card->ext_csd.man_bkops_en)
 504                                 pr_info("%s: MAN_BKOPS_EN bit is not set\n",
 505                                         mmc_hostname(card->host));
 506                 }
 507
 508                 /* check whether the eMMC card supports HPI */
 509                 if (!broken_hpi && (ext_csd[EXT_CSD_HPI_FEATURES] & 0x1)) {
 510                         card->ext_csd.hpi = 1;
 511                         if (ext_csd[EXT_CSD_HPI_FEATURES] & 0x2)
 512                                 card->ext_csd.hpi_cmd = MMC_STOP_TRANSMISSION;
 513                         else
 514                                 card->ext_csd.hpi_cmd = MMC_SEND_STATUS;
 515                         /*
 516                          * Indicate the maximum timeout to close
 517                          * a command interrupted by HPI
 518                          */
 519                         card->ext_csd.out_of_int_time =
 520                                 ext_csd[EXT_CSD_OUT_OF_INTERRUPT_TIME] * 10;
 521                 }
 522
 523                 card->ext_csd.rel_param = ext_csd[EXT_CSD_WR_REL_PARAM];
 524                 card->ext_csd.rst_n_function = ext_csd[EXT_CSD_RST_N_FUNCTION];
 525
 526                 /*
 527                  * RPMB regions are defined in multiples of 128K.
 528                  */
 529                 card->ext_csd.raw_rpmb_size_mult = ext_csd[EXT_CSD_RPMB_MULT];
 530                 if (ext_csd[EXT_CSD_RPMB_MULT] && mmc_host_cmd23(card->host)) {
 531                         mmc_part_add(card, ext_csd[EXT_CSD_RPMB_MULT] << 17,
 532                                 EXT_CSD_PART_CONFIG_ACC_RPMB,
 533                                 "rpmb", 0, false,
 534                                 MMC_BLK_DATA_AREA_RPMB);
 535                 }
 536         }
 537
 538         card->ext_csd.raw_erased_mem_count = ext_csd[EXT_CSD_ERASED_MEM_CONT];
 539         if (ext_csd[EXT_CSD_ERASED_MEM_CONT])
 540                 card->erased_byte = 0xFF;
 541         else
 542                 card->erased_byte = 0x0;
 543
 544         /* eMMC v4.5 or later */
 545         if (card->ext_csd.rev >= 6) {
 546                 card->ext_csd.feature_support |= MMC_DISCARD_FEATURE;
 547
 548                 card->ext_csd.generic_cmd6_time = 10 *
 549                         ext_csd[EXT_CSD_GENERIC_CMD6_TIME];
 550                 card->ext_csd.power_off_longtime = 10 *
 551                         ext_csd[EXT_CSD_POWER_OFF_LONG_TIME];
 552
 553                 card->ext_csd.cache_size =
 554                         ext_csd[EXT_CSD_CACHE_SIZE + 0] << 0 |
 555                         ext_csd[EXT_CSD_CACHE_SIZE + 1] << 8 |
 556                         ext_csd[EXT_CSD_CACHE_SIZE + 2] << 16 |
 557                         ext_csd[EXT_CSD_CACHE_SIZE + 3] << 24;
 558
 559                 if (ext_csd[EXT_CSD_DATA_SECTOR_SIZE] == 1)
 560                         card->ext_csd.data_sector_size = 4096;
 561                 else
 562                         card->ext_csd.data_sector_size = 512;
 563
 564                 if ((ext_csd[EXT_CSD_DATA_TAG_SUPPORT] & 1) &&
 565                     (ext_csd[EXT_CSD_TAG_UNIT_SIZE] <= 8)) {
 566                         card->ext_csd.data_tag_unit_size =
 567                         ((unsigned int) 1 << ext_csd[EXT_CSD_TAG_UNIT_SIZE]) *
 568                         (card->ext_csd.data_sector_size);
 569                 } else {
 570                         card->ext_csd.data_tag_unit_size = 0;
 571                 }
 572
 573                 card->ext_csd.max_packed_writes =
 574                         ext_csd[EXT_CSD_MAX_PACKED_WRITES];
 575                 card->ext_csd.max_packed_reads =
 576                         ext_csd[EXT_CSD_MAX_PACKED_READS];
 577         } else {
 578                 card->ext_csd.data_sector_size = 512;
 579         }
 580
 581         /* eMMC v5 or later */
 582         if (card->ext_csd.rev >= 7) {
 583                 memcpy(card->ext_csd.fwrev, &ext_csd[EXT_CSD_FIRMWARE_VERSION],
 584                        MMC_FIRMWARE_LEN);
 585                 card->ext_csd.ffu_capable =
 586                         (ext_csd[EXT_CSD_SUPPORTED_MODE] & 0x1) &&
 587                         !(ext_csd[EXT_CSD_FW_CONFIG] & 0x1);
 588         }
 589 out:
 590         return err;
 591 }
 592
 593 static int mmc_read_ext_csd(struct mmc_card *card)
 594 {
 595         u8 *ext_csd;
 596         int err;
 597
 598         if (!mmc_can_ext_csd(card))
 599                 return 0;
 600
 601         err = mmc_get_ext_csd(card, &ext_csd);
 602         if (err) {
 603                 /* If the host or the card can't do the switch,
 604                  * fail more gracefully. */
 605                 if ((err != -EINVAL)
 606                  && (err != -ENOSYS)
 607                  && (err != -EFAULT))
 608                         return err;
 609
 610                 /*
 611                  * High capacity cards should have this "magic" size
 612                  * stored in their CSD.
 613                  */
 614                 if (card->csd.capacity == (4096 * 512)) {
 615                         pr_err("%s: unable to read EXT_CSD on a possible high capacity card. Card will be ignored.\n",
 616                                 mmc_hostname(card->host));
 617                 } else {
 618                         pr_warn("%s: unable to read EXT_CSD, performance might suffer\n",
 619                                 mmc_hostname(card->host));
 620                         err = 0;
 621                 }
 622
 623                 return err;
 624         }
 625
 626         err = mmc_decode_ext_csd(card, ext_csd);
 627         kfree(ext_csd);
 628         return err;
 629 }
 630
 631 static int mmc_compare_ext_csds(struct mmc_card *card, unsigned bus_width)
 632 {
 633         u8 *bw_ext_csd;
 634         int err;
 635
 636         if (bus_width == MMC_BUS_WIDTH_1)
 637                 return 0;
 638
 639         err = mmc_get_ext_csd(card, &bw_ext_csd);
 640         if (err)
 641                 return err;
 642
 643         /* only compare read only fields */
 644         err = !((card->ext_csd.raw_partition_support ==
 645                         bw_ext_csd[EXT_CSD_PARTITION_SUPPORT]) &&
 646                 (card->ext_csd.raw_erased_mem_count ==
 647                         bw_ext_csd[EXT_CSD_ERASED_MEM_CONT]) &&
 648                 (card->ext_csd.rev ==
 649                         bw_ext_csd[EXT_CSD_REV]) &&
 650                 (card->ext_csd.raw_ext_csd_structure ==
 651                         bw_ext_csd[EXT_CSD_STRUCTURE]) &&
 652                 (card->ext_csd.raw_card_type ==
 653                         bw_ext_csd[EXT_CSD_CARD_TYPE]) &&
 654                 (card->ext_csd.raw_s_a_timeout ==
 655                         bw_ext_csd[EXT_CSD_S_A_TIMEOUT]) &&
 656                 (card->ext_csd.raw_hc_erase_gap_size ==
 657                         bw_ext_csd[EXT_CSD_HC_WP_GRP_SIZE]) &&
 658                 (card->ext_csd.raw_erase_timeout_mult ==
 659                         bw_ext_csd[EXT_CSD_ERASE_TIMEOUT_MULT]) &&
 660                 (card->ext_csd.raw_hc_erase_grp_size ==
 661                         bw_ext_csd[EXT_CSD_HC_ERASE_GRP_SIZE]) &&
 662                 (card->ext_csd.raw_sec_trim_mult ==
 663                         bw_ext_csd[EXT_CSD_SEC_TRIM_MULT]) &&
 664                 (card->ext_csd.raw_sec_erase_mult ==
 665                         bw_ext_csd[EXT_CSD_SEC_ERASE_MULT]) &&
 666                 (card->ext_csd.raw_sec_feature_support ==
 667                         bw_ext_csd[EXT_CSD_SEC_FEATURE_SUPPORT]) &&
 668                 (card->ext_csd.raw_trim_mult ==
 669                         bw_ext_csd[EXT_CSD_TRIM_MULT]) &&
 670                 (card->ext_csd.raw_sectors[0] ==
 671                         bw_ext_csd[EXT_CSD_SEC_CNT + 0]) &&
 672                 (card->ext_csd.raw_sectors[1] ==
 673                         bw_ext_csd[EXT_CSD_SEC_CNT + 1]) &&
 674                 (card->ext_csd.raw_sectors[2] ==
 675                         bw_ext_csd[EXT_CSD_SEC_CNT + 2]) &&
 676                 (card->ext_csd.raw_sectors[3] ==
 677                         bw_ext_csd[EXT_CSD_SEC_CNT + 3]) &&
 678                 (card->ext_csd.raw_pwr_cl_52_195 ==
 679                         bw_ext_csd[EXT_CSD_PWR_CL_52_195]) &&
 680                 (card->ext_csd.raw_pwr_cl_26_195 ==
 681                         bw_ext_csd[EXT_CSD_PWR_CL_26_195]) &&
 682                 (card->ext_csd.raw_pwr_cl_52_360 ==
 683                         bw_ext_csd[EXT_CSD_PWR_CL_52_360]) &&
 684                 (card->ext_csd.raw_pwr_cl_26_360 ==
 685                         bw_ext_csd[EXT_CSD_PWR_CL_26_360]) &&
 686                 (card->ext_csd.raw_pwr_cl_200_195 ==
 687                         bw_ext_csd[EXT_CSD_PWR_CL_200_195]) &&
 688                 (card->ext_csd.raw_pwr_cl_200_360 ==
 689                         bw_ext_csd[EXT_CSD_PWR_CL_200_360]) &&
 690                 (card->ext_csd.raw_pwr_cl_ddr_52_195 ==
 691                         bw_ext_csd[EXT_CSD_PWR_CL_DDR_52_195]) &&
 692                 (card->ext_csd.raw_pwr_cl_ddr_52_360 ==
 693                         bw_ext_csd[EXT_CSD_PWR_CL_DDR_52_360]) &&
 694                 (card->ext_csd.raw_pwr_cl_ddr_200_360 ==
 695                         bw_ext_csd[EXT_CSD_PWR_CL_DDR_200_360]));
 696
 697         if (err)
 698                 err = -EINVAL;
 699
 700         kfree(bw_ext_csd);
 701         return err;
 702 }
 703
 704 MMC_DEV_ATTR(cid, "%08x%08x%08x%08x\n", card->raw_cid[0], card->raw_cid[1],
 705         card->raw_cid[2], card->raw_cid[3]);
 706 MMC_DEV_ATTR(csd, "%08x%08x%08x%08x\n", card->raw_csd[0], card->raw_csd[1],
 707         card->raw_csd[2], card->raw_csd[3]);
 708 MMC_DEV_ATTR(date, "%02d/%04d\n", card->cid.month, card->cid.year);
 709 MMC_DEV_ATTR(erase_size, "%u\n", card->erase_size << 9);
 710 MMC_DEV_ATTR(preferred_erase_size, "%u\n", card->pref_erase << 9);
 711 MMC_DEV_ATTR(ffu_capable, "%d\n", card->ext_csd.ffu_capable);
 712 MMC_DEV_ATTR(hwrev, "0x%x\n", card->cid.hwrev);
 713 MMC_DEV_ATTR(manfid, "0x%06x\n", card->cid.manfid);
 714 MMC_DEV_ATTR(name, "%s\n", card->cid.prod_name);
 715 MMC_DEV_ATTR(oemid, "0x%04x\n", card->cid.oemid);
 716 MMC_DEV_ATTR(prv, "0x%x\n", card->cid.prv);
 717 MMC_DEV_ATTR(serial, "0x%08x\n", card->cid.serial);
 718 MMC_DEV_ATTR(enhanced_area_offset, "%llu\n",
 719                 card->ext_csd.enhanced_area_offset);
 720 MMC_DEV_ATTR(enhanced_area_size, "%u\n", card->ext_csd.enhanced_area_size);
 721 MMC_DEV_ATTR(raw_rpmb_size_mult, "%#x\n", card->ext_csd.raw_rpmb_size_mult);
 722 MMC_DEV_ATTR(rel_sectors, "%#x\n", card->ext_csd.rel_sectors);
 723
 724 static ssize_t mmc_fwrev_show(struct device *dev,
 725                               struct device_attribute *attr,
 726                               char *buf)
 727 {
 728         struct mmc_card *card = mmc_dev_to_card(dev);
 729
 730         if (card->ext_csd.rev < 7) {
 731                 return sprintf(buf, "0x%x\n", card->cid.fwrev);
 732         } else {
 733                 return sprintf(buf, "0x%*phN\n", MMC_FIRMWARE_LEN,
 734                                card->ext_csd.fwrev);
 735         }
 736 }
 737
 738 static DEVICE_ATTR(fwrev, S_IRUGO, mmc_fwrev_show, NULL);
 739
 740 static struct attribute *mmc_std_attrs[] = {
 741         &dev_attr_cid.attr,
 742         &dev_attr_csd.attr,
 743         &dev_attr_date.attr,
 744         &dev_attr_erase_size.attr,
 745         &dev_attr_preferred_erase_size.attr,
 746         &dev_attr_fwrev.attr,
 747         &dev_attr_ffu_capable.attr,
 748         &dev_attr_hwrev.attr,
 749         &dev_attr_manfid.attr,
 750         &dev_attr_name.attr,
 751         &dev_attr_oemid.attr,
 752         &dev_attr_prv.attr,
 753         &dev_attr_serial.attr,
 754         &dev_attr_enhanced_area_offset.attr,
 755         &dev_attr_enhanced_area_size.attr,
 756         &dev_attr_raw_rpmb_size_mult.attr,
 757         &dev_attr_rel_sectors.attr,
 758         NULL,
 759 };
 760 ATTRIBUTE_GROUPS(mmc_std);
 761
 762 static struct device_type mmc_type = {
 763         .groups = mmc_std_groups,
 764 };
 765
 766 /*
 767  * Select the PowerClass for the current bus width
 768  * If power class is defined for 4/8 bit bus in the
 769  * extended CSD register, select it by executing the
 770  * mmc_switch command.
 771  */
 772 static int __mmc_select_powerclass(struct mmc_card *card,
 773                                    unsigned int bus_width)
 774 {
 775         struct mmc_host *host = card->host;
 776         struct mmc_ext_csd *ext_csd = &card->ext_csd;
 777         unsigned int pwrclass_val = 0;
 778         int err = 0;
 779
 780         switch (1 << host->ios.vdd) {
 781         case MMC_VDD_165_195:
 782                 if (host->ios.clock <= MMC_HIGH_26_MAX_DTR)
 783                         pwrclass_val = ext_csd->raw_pwr_cl_26_195;
 784                 else if (host->ios.clock <= MMC_HIGH_52_MAX_DTR)
 785                         pwrclass_val = (bus_width <= EXT_CSD_BUS_WIDTH_8) ?
 786                                 ext_csd->raw_pwr_cl_52_195 :
 787                                 ext_csd->raw_pwr_cl_ddr_52_195;
 788                 else if (host->ios.clock <= MMC_HS200_MAX_DTR)
 789                         pwrclass_val = ext_csd->raw_pwr_cl_200_195;
 790                 break;
 791         case MMC_VDD_27_28:
 792         case MMC_VDD_28_29:
 793         case MMC_VDD_29_30:
 794         case MMC_VDD_30_31:
 795         case MMC_VDD_31_32:
 796         case MMC_VDD_32_33:
 797         case MMC_VDD_33_34:
 798         case MMC_VDD_34_35:
 799         case MMC_VDD_35_36:
 800                 if (host->ios.clock <= MMC_HIGH_26_MAX_DTR)
 801                         pwrclass_val = ext_csd->raw_pwr_cl_26_360;
 802                 else if (host->ios.clock <= MMC_HIGH_52_MAX_DTR)
 803                         pwrclass_val = (bus_width <= EXT_CSD_BUS_WIDTH_8) ?
 804                                 ext_csd->raw_pwr_cl_52_360 :
 805                                 ext_csd->raw_pwr_cl_ddr_52_360;
 806                 else if (host->ios.clock <= MMC_HS200_MAX_DTR)
 807                         pwrclass_val = (bus_width == EXT_CSD_DDR_BUS_WIDTH_8) ?
 808                                 ext_csd->raw_pwr_cl_ddr_200_360 :
 809                                 ext_csd->raw_pwr_cl_200_360;
 810                 break;
 811         default:
 812                 pr_warn("%s: Voltage range not supported for power class\n",
 813                         mmc_hostname(host));
 814                 return -EINVAL;
 815         }
 816
 817         if (bus_width & (EXT_CSD_BUS_WIDTH_8 | EXT_CSD_DDR_BUS_WIDTH_8))
 818                 pwrclass_val = (pwrclass_val & EXT_CSD_PWR_CL_8BIT_MASK) >>
 819                                 EXT_CSD_PWR_CL_8BIT_SHIFT;
 820         else
 821                 pwrclass_val = (pwrclass_val & EXT_CSD_PWR_CL_4BIT_MASK) >>
 822                                 EXT_CSD_PWR_CL_4BIT_SHIFT;
 823
 824         /* If the power class is different from the default value */
 825         if (pwrclass_val > 0) {
 826                 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
 827                                  EXT_CSD_POWER_CLASS,
 828                                  pwrclass_val,
 829                                  card->ext_csd.generic_cmd6_time);
 830         }
 831
 832         return err;
 833 }
 834
 835 static int mmc_select_powerclass(struct mmc_card *card)
 836 {
 837         struct mmc_host *host = card->host;
 838         u32 bus_width, ext_csd_bits;
 839         int err, ddr;
 840
 841         /* Power class selection is supported for versions >= 4.0 */
 842         if (!mmc_can_ext_csd(card))
 843                 return 0;
 844
 845         bus_width = host->ios.bus_width;
 846         /* Power class values are defined only for 4/8 bit bus */
 847         if (bus_width == MMC_BUS_WIDTH_1)
 848                 return 0;
 849
 850         ddr = card->mmc_avail_type & EXT_CSD_CARD_TYPE_DDR_52;
 851         if (ddr)
 852                 ext_csd_bits = (bus_width == MMC_BUS_WIDTH_8) ?
 853                         EXT_CSD_DDR_BUS_WIDTH_8 : EXT_CSD_DDR_BUS_WIDTH_4;
 854         else
 855                 ext_csd_bits = (bus_width == MMC_BUS_WIDTH_8) ?
 856                         EXT_CSD_BUS_WIDTH_8 :  EXT_CSD_BUS_WIDTH_4;
 857
 858         err = __mmc_select_powerclass(card, ext_csd_bits);
 859         if (err)
 860                 pr_warn("%s: power class selection to bus width %d ddr %d failed\n",
 861                         mmc_hostname(host), 1 << bus_width, ddr);
 862
 863         return err;
 864 }
 865
 866 /*
 867  * Set the bus speed for the selected speed mode.
 868  */
 869 static void mmc_set_bus_speed(struct mmc_card *card)
 870 {
 871         unsigned int max_dtr = (unsigned int)-1;
 872
 873         if ((mmc_card_hs200(card) || mmc_card_hs400(card)) &&
 874              max_dtr > card->ext_csd.hs200_max_dtr)
 875                 max_dtr = card->ext_csd.hs200_max_dtr;
 876         else if (mmc_card_hs(card) && max_dtr > card->ext_csd.hs_max_dtr)
 877                 max_dtr = card->ext_csd.hs_max_dtr;
 878         else if (max_dtr > card->csd.max_dtr)
 879                 max_dtr = card->csd.max_dtr;
 880
 881         mmc_set_clock(card->host, max_dtr);
 882 }
 883
 884 /*
 885  * Select the bus width amoung 4-bit and 8-bit(SDR).
 886  * If the bus width is changed successfully, return the selected width value.
 887  * Zero is returned instead of error value if the wide width is not supported.
 888  */
 889 static int mmc_select_bus_width(struct mmc_card *card)
 890 {
 891         static unsigned ext_csd_bits[] = {
 892                 EXT_CSD_BUS_WIDTH_8,
 893                 EXT_CSD_BUS_WIDTH_4,
 894         };
 895         static unsigned bus_widths[] = {
 896                 MMC_BUS_WIDTH_8,
 897                 MMC_BUS_WIDTH_4,
 898         };
 899         struct mmc_host *host = card->host;
 900         unsigned idx, bus_width = 0;
 901         int err = 0;
 902
 903         if (!mmc_can_ext_csd(card) ||
 904             !(host->caps & (MMC_CAP_4_BIT_DATA | MMC_CAP_8_BIT_DATA)))
 905                 return 0;
 906
 907         idx = (host->caps & MMC_CAP_8_BIT_DATA) ? 0 : 1;
 908
 909         /*
 910          * Unlike SD, MMC cards dont have a configuration register to notify
 911          * supported bus width. So bus test command should be run to identify
 912          * the supported bus width or compare the ext csd values of current
 913          * bus width and ext csd values of 1 bit mode read earlier.
 914          */
 915         for (; idx < ARRAY_SIZE(bus_widths); idx++) {
 916                 /*
 917                  * Host is capable of 8bit transfer, then switch
 918                  * the device to work in 8bit transfer mode. If the
 919                  * mmc switch command returns error then switch to
 920                  * 4bit transfer mode. On success set the corresponding
 921                  * bus width on the host.
 922                  */
 923                 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
 924                                  EXT_CSD_BUS_WIDTH,
 925                                  ext_csd_bits[idx],
 926                                  card->ext_csd.generic_cmd6_time);
 927                 if (err)
 928                         continue;
 929
 930                 bus_width = bus_widths[idx];
 931                 mmc_set_bus_width(host, bus_width);
 932
 933                 /*
 934                  * If controller can't handle bus width test,
 935                  * compare ext_csd previously read in 1 bit mode
 936                  * against ext_csd at new bus width
 937                  */
 938                 if (!(host->caps & MMC_CAP_BUS_WIDTH_TEST))
 939                         err = mmc_compare_ext_csds(card, bus_width);
 940                 else
 941                         err = mmc_bus_test(card, bus_width);
 942
 943                 if (!err) {
 944                         err = bus_width;
 945                         break;
 946                 } else {
 947                         pr_warn("%s: switch to bus width %d failed\n",
 948                                 mmc_hostname(host), ext_csd_bits[idx]);
 949                 }
 950         }
 951
 952         return err;
 953 }
 954
 955 /*
 956  * Switch to the high-speed mode
 957  */
 958 static int mmc_select_hs(struct mmc_card *card)
 959 {
 960         int err;
 961
 962         err = __mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
 963                            EXT_CSD_HS_TIMING, EXT_CSD_TIMING_HS,
 964                            card->ext_csd.generic_cmd6_time,
 965                            true, true, true);
 966         if (!err)
 967                 mmc_set_timing(card->host, MMC_TIMING_MMC_HS);
 968
 969         return err;
 970 }
 971
 972 /*
 973  * Activate wide bus and DDR if supported.
 974  */
 975 static int mmc_select_hs_ddr(struct mmc_card *card)
 976 {
 977         struct mmc_host *host = card->host;
 978         u32 bus_width, ext_csd_bits;
 979         int err = 0;
 980
 981         if (!(card->mmc_avail_type & EXT_CSD_CARD_TYPE_DDR_52))
 982                 return 0;
 983
 984         bus_width = host->ios.bus_width;
 985         if (bus_width == MMC_BUS_WIDTH_1)
 986                 return 0;
 987
 988         ext_csd_bits = (bus_width == MMC_BUS_WIDTH_8) ?
 989                 EXT_CSD_DDR_BUS_WIDTH_8 : EXT_CSD_DDR_BUS_WIDTH_4;
 990
 991         err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
 992                         EXT_CSD_BUS_WIDTH,
 993                         ext_csd_bits,
 994                         card->ext_csd.generic_cmd6_time);
 995         if (err) {
 996                 pr_err("%s: switch to bus width %d ddr failed\n",
 997                         mmc_hostname(host), 1 << bus_width);
 998                 return err;
 999         }
1000
1001         /*
1002          * eMMC cards can support 3.3V to 1.2V i/o (vccq)
1003          * signaling.
1004          *
1005          * EXT_CSD_CARD_TYPE_DDR_1_8V means 3.3V or 1.8V vccq.
1006          *
1007          * 1.8V vccq at 3.3V core voltage (vcc) is not required
1008          * in the JEDEC spec for DDR.
1009          *
1010          * Even (e)MMC card can support 3.3v to 1.2v vccq, but not all
1011          * host controller can support this, like some of the SDHCI
1012          * controller which connect to an eMMC device. Some of these
1013          * host controller still needs to use 1.8v vccq for supporting
1014          * DDR mode.
1015          *
1016          * So the sequence will be:
1017          * if (host and device can both support 1.2v IO)
1018          *      use 1.2v IO;
1019          * else if (host and device can both support 1.8v IO)
1020          *      use 1.8v IO;
1021          * so if host and device can only support 3.3v IO, this is the
1022          * last choice.
1023          *
1024          * WARNING: eMMC rules are NOT the same as SD DDR
1025          */
1026         err = -EINVAL;
1027         if (card->mmc_avail_type & EXT_CSD_CARD_TYPE_DDR_1_2V)
1028                 err = __mmc_set_signal_voltage(host, MMC_SIGNAL_VOLTAGE_120);
1029
1030         if (err && (card->mmc_avail_type & EXT_CSD_CARD_TYPE_DDR_1_8V))
1031                 err = __mmc_set_signal_voltage(host, MMC_SIGNAL_VOLTAGE_180);
1032
1033         /* make sure vccq is 3.3v after switching disaster */
1034         if (err)
1035                 err = __mmc_set_signal_voltage(host, MMC_SIGNAL_VOLTAGE_330);
1036
1037         if (!err)
1038                 mmc_set_timing(host, MMC_TIMING_MMC_DDR52);
1039
1040         return err;
1041 }
1042
1043 /* Caller must hold re-tuning */
1044 static int mmc_switch_status(struct mmc_card *card)
1045 {
1046         u32 status;
1047         int err;
1048
1049         err = mmc_send_status(card, &status);
1050         if (err)
1051                 return err;
1052
1053         return mmc_switch_status_error(card->host, status);
1054 }
1055
1056 static int mmc_select_hs400(struct mmc_card *card)
1057 {
1058         struct mmc_host *host = card->host;
1059         unsigned int max_dtr;
1060         int err = 0;
1061         u8 val;
1062
1063         /*
1064          * HS400 mode requires 8-bit bus width
1065          */
1066         if (!(card->mmc_avail_type & EXT_CSD_CARD_TYPE_HS400 &&
1067               host->ios.bus_width == MMC_BUS_WIDTH_8))
1068                 return 0;
1069
1070         /* Reduce frequency to HS frequency */
1071         max_dtr = card->ext_csd.hs_max_dtr;
1072         mmc_set_clock(host, max_dtr);
1073
1074         /* Switch card to HS mode */
1075         val = EXT_CSD_TIMING_HS |
1076               card->drive_strength << EXT_CSD_DRV_STR_SHIFT;
1077         err = __mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
1078                            EXT_CSD_HS_TIMING, val,
1079                            card->ext_csd.generic_cmd6_time,
1080                            true, true, true);
1081         if (err) {
1082                 pr_err("%s: switch to high-speed from hs200 failed, err:%d\n",
1083                         mmc_hostname(host), err);
1084                 return err;
1085         }
1086
1087         /* Set host controller to HS timing */
1088         mmc_set_timing(card->host, MMC_TIMING_MMC_HS);
1089
1090         err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
1091                          EXT_CSD_BUS_WIDTH,
1092                          EXT_CSD_DDR_BUS_WIDTH_8,
1093                          card->ext_csd.generic_cmd6_time);
1094         if (err) {
1095                 pr_err("%s: switch to bus width for hs400 failed, err:%d\n",
1096                         mmc_hostname(host), err);
1097                 return err;
1098         }
1099
1100         val = EXT_CSD_TIMING_HS400 |
1101               card->drive_strength << EXT_CSD_DRV_STR_SHIFT;
1102         err = __mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
1103                            EXT_CSD_HS_TIMING, val,
1104                            card->ext_csd.generic_cmd6_time,
1105                            true, true, true);
1106         if (err) {
1107                 pr_err("%s: switch to hs400 failed, err:%d\n",
1108                          mmc_hostname(host), err);
1109                 return err;
1110         }
1111
1112         mmc_set_timing(host, MMC_TIMING_MMC_HS400);
1113         mmc_set_bus_speed(card);
1114
1115         return 0;
1116 }
1117
1118 int mmc_hs200_to_hs400(struct mmc_card *card)
1119 {
1120         return mmc_select_hs400(card);
1121 }
1122
1123 int mmc_hs400_to_hs200(struct mmc_card *card)
1124 {
1125         struct mmc_host *host = card->host;
1126         bool send_status = true;
1127         unsigned int max_dtr;
1128         int err;
1129         u8 val;
1130
1131         if (host->caps & MMC_CAP_WAIT_WHILE_BUSY)
1132                 send_status = false;
1133
1134         /* Reduce frequency to HS */
1135         max_dtr = card->ext_csd.hs_max_dtr;
1136         mmc_set_clock(host, max_dtr);
1137
1138         /* Switch HS400 to HS DDR */
1139         val = EXT_CSD_TIMING_HS |
1140               card->drive_strength << EXT_CSD_DRV_STR_SHIFT;
1141         err = __mmc_switch(card, EXT_CSD_CMD_SET_NORMAL, EXT_CSD_HS_TIMING,
1142                            val, card->ext_csd.generic_cmd6_time,
1143                            true, send_status, true);
1144         if (err)
1145                 goto out_err;
1146
1147         mmc_set_timing(host, MMC_TIMING_MMC_DDR52);
1148
1149         if (!send_status) {
1150                 err = mmc_switch_status(card);
1151                 if (err)
1152                         goto out_err;
1153         }
1154
1155         /* Switch HS DDR to HS */
1156         err = __mmc_switch(card, EXT_CSD_CMD_SET_NORMAL, EXT_CSD_BUS_WIDTH,
1157                            EXT_CSD_BUS_WIDTH_8, card->ext_csd.generic_cmd6_time,
1158                            true, send_status, true);
1159         if (err)
1160                 goto out_err;
1161
1162         mmc_set_timing(host, MMC_TIMING_MMC_HS);
1163
1164         if (!send_status) {
1165                 err = mmc_switch_status(card);
1166                 if (err)
1167                         goto out_err;
1168         }
1169
1170         /* Switch HS to HS200 */
1171         val = EXT_CSD_TIMING_HS200 |
1172               card->drive_strength << EXT_CSD_DRV_STR_SHIFT;
1173         err = __mmc_switch(card, EXT_CSD_CMD_SET_NORMAL, EXT_CSD_HS_TIMING,
1174                            val, card->ext_csd.generic_cmd6_time, true,
1175                            send_status, true);
1176         if (err)
1177                 goto out_err;
1178
1179         mmc_set_timing(host, MMC_TIMING_MMC_HS200);
1180
1181         if (!send_status) {
1182                 err = mmc_switch_status(card);
1183                 if (err)
1184                         goto out_err;
1185         }
1186
1187         mmc_set_bus_speed(card);
1188
1189         return 0;
1190
1191 out_err:
1192         pr_err("%s: %s failed, error %d\n", mmc_hostname(card->host),
1193                __func__, err);
1194         return err;
1195 }
1196
1197 static void mmc_select_driver_type(struct mmc_card *card)
1198 {
1199         int card_drv_type, drive_strength, drv_type;
1200
1201         card_drv_type = card->ext_csd.raw_driver_strength |
1202                         mmc_driver_type_mask(0);
1203
1204         drive_strength = mmc_select_drive_strength(card,
1205                                                    card->ext_csd.hs200_max_dtr,
1206                                                    card_drv_type, &drv_type);
1207
1208         card->drive_strength = drive_strength;
1209
1210         if (drv_type)
1211                 mmc_set_driver_type(card->host, drv_type);
1212 }
1213
1214 /*
1215  * For device supporting HS200 mode, the following sequence
1216  * should be done before executing the tuning process.
1217  * 1. set the desired bus width(4-bit or 8-bit, 1-bit is not supported)
1218  * 2. switch to HS200 mode
1219  * 3. set the clock to > 52Mhz and <=200MHz
1220  */
1221 static int mmc_select_hs200(struct mmc_card *card)
1222 {
1223         struct mmc_host *host = card->host;
1224         bool send_status = true;
1225         unsigned int old_timing;
1226         int err = -EINVAL;
1227         u8 val;
1228
1229         if (card->mmc_avail_type & EXT_CSD_CARD_TYPE_HS200_1_2V)
1230                 err = __mmc_set_signal_voltage(host, MMC_SIGNAL_VOLTAGE_120);
1231
1232         if (err && card->mmc_avail_type & EXT_CSD_CARD_TYPE_HS200_1_8V)
1233                 err = __mmc_set_signal_voltage(host, MMC_SIGNAL_VOLTAGE_180);
1234
1235         /* If fails try again during next card power cycle */
1236         if (err)
1237                 goto err;
1238
1239         mmc_select_driver_type(card);
1240
1241         if (host->caps & MMC_CAP_WAIT_WHILE_BUSY)
1242                 send_status = false;
1243
1244         /*
1245          * Set the bus width(4 or 8) with host's support and
1246          * switch to HS200 mode if bus width is set successfully.
1247          */
1248         err = mmc_select_bus_width(card);
1249         if (!IS_ERR_VALUE(err)) {
1250                 val = EXT_CSD_TIMING_HS200 |
1251                       card->drive_strength << EXT_CSD_DRV_STR_SHIFT;
1252                 err = __mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
1253                                    EXT_CSD_HS_TIMING, val,
1254                                    card->ext_csd.generic_cmd6_time,
1255                                    true, send_status, true);
1256                 if (err)
1257                         goto err;
1258                 old_timing = host->ios.timing;
1259                 mmc_set_timing(host, MMC_TIMING_MMC_HS200);
1260                 if (!send_status) {
1261                         err = mmc_switch_status(card);
1262                         /*
1263                          * mmc_select_timing() assumes timing has not changed if
1264                          * it is a switch error.
1265                          */
1266                         if (err == -EBADMSG)
1267                                 mmc_set_timing(host, old_timing);
1268                 }
1269         }
1270 err:
1271         if (err)
1272                 pr_err("%s: %s failed, error %d\n", mmc_hostname(card->host),
1273                        __func__, err);
1274         return err;
1275 }
1276
1277 /*
1278  * Activate High Speed or HS200 mode if supported.
1279  */
1280 static int mmc_select_timing(struct mmc_card *card)
1281 {
1282         int err = 0;
1283
1284         if (!mmc_can_ext_csd(card))
1285                 goto bus_speed;
1286
1287         if (card->mmc_avail_type & EXT_CSD_CARD_TYPE_HS200)
1288                 err = mmc_select_hs200(card);
1289         else if (card->mmc_avail_type & EXT_CSD_CARD_TYPE_HS)
1290                 err = mmc_select_hs(card);
1291
1292         if (err && err != -EBADMSG)
1293                 return err;
1294
1295         if (err) {
1296                 pr_warn("%s: switch to %s failed\n",
1297                         mmc_card_hs(card) ? "high-speed" :
1298                         (mmc_card_hs200(card) ? "hs200" : ""),
1299                         mmc_hostname(card->host));
1300                 err = 0;
1301         }
1302
1303 bus_speed:
1304         /*
1305          * Set the bus speed to the selected bus timing.
1306          * If timing is not selected, backward compatible is the default.
1307          */
1308         mmc_set_bus_speed(card);
1309         return err;
1310 }
1311
1312 /*
1313  * Execute tuning sequence to seek the proper bus operating
1314  * conditions for HS200 and HS400, which sends CMD21 to the device.
1315  */
1316 static int mmc_hs200_tuning(struct mmc_card *card)
1317 {
1318         struct mmc_host *host = card->host;
1319
1320         /*
1321          * Timing should be adjusted to the HS400 target
1322          * operation frequency for tuning process
1323          */
1324         if (card->mmc_avail_type & EXT_CSD_CARD_TYPE_HS400 &&
1325             host->ios.bus_width == MMC_BUS_WIDTH_8)
1326                 if (host->ops->prepare_hs400_tuning)
1327                         host->ops->prepare_hs400_tuning(host, &host->ios);
1328
1329         return mmc_execute_tuning(card);
1330 }
1331
1332 /*
1333  * Handle the detection and initialisation of a card.
1334  *
1335  * In the case of a resume, "oldcard" will contain the card
1336  * we're trying to reinitialise.
1337  */
1338 static int mmc_init_card(struct mmc_host *host, u32 ocr,
1339         struct mmc_card *oldcard)
1340 {
1341         struct mmc_card *card;
1342         int err;
1343         u32 cid[4];
1344         u32 rocr;
1345
1346         BUG_ON(!host);
1347         WARN_ON(!host->claimed);
1348
1349         /* Set correct bus mode for MMC before attempting init */
1350         if (!mmc_host_is_spi(host))
1351                 mmc_set_bus_mode(host, MMC_BUSMODE_OPENDRAIN);
1352
1353         /*
1354          * Since we're changing the OCR value, we seem to
1355          * need to tell some cards to go back to the idle
1356          * state.  We wait 1ms to give cards time to
1357          * respond.
1358          * mmc_go_idle is needed for eMMC that are asleep
1359          */
1360         mmc_go_idle(host);
1361
1362         /* The extra bit indicates that we support high capacity */
1363         err = mmc_send_op_cond(host, ocr | (1 << 30), &rocr);
1364         if (err)
1365                 goto err;
1366
1367         /*
1368          * For SPI, enable CRC as appropriate.
1369          */
1370         if (mmc_host_is_spi(host)) {
1371                 err = mmc_spi_set_crc(host, use_spi_crc);
1372                 if (err)
1373                         goto err;
1374         }
1375
1376         /*
1377          * Fetch CID from card.
1378          */
1379         if (mmc_host_is_spi(host))
1380                 err = mmc_send_cid(host, cid);
1381         else
1382                 err = mmc_all_send_cid(host, cid);
1383         if (err)
1384                 goto err;
1385
1386         if (oldcard) {
1387                 if (memcmp(cid, oldcard->raw_cid, sizeof(cid)) != 0) {
1388                         err = -ENOENT;
1389                         goto err;
1390                 }
1391
1392                 card = oldcard;
1393         } else {
1394                 /*
1395                  * Allocate card structure.
1396                  */
1397                 card = mmc_alloc_card(host, &mmc_type);
1398                 if (IS_ERR(card)) {
1399                         err = PTR_ERR(card);
1400                         goto err;
1401                 }
1402
1403                 card->ocr = ocr;
1404                 card->type = MMC_TYPE_MMC;
1405                 card->rca = 1;
1406                 memcpy(card->raw_cid, cid, sizeof(card->raw_cid));
1407         }
1408
1409         /*
1410          * Call the optional HC's init_card function to handle quirks.
1411          */
1412         if (host->ops->init_card)
1413                 host->ops->init_card(host, card);
1414
1415         /*
1416          * For native busses:  set card RCA and quit open drain mode.
1417          */
1418         if (!mmc_host_is_spi(host)) {
1419                 err = mmc_set_relative_addr(card);
1420                 if (err)
1421                         goto free_card;
1422
1423                 mmc_set_bus_mode(host, MMC_BUSMODE_PUSHPULL);
1424         }
1425
1426         if (!oldcard) {
1427                 /*
1428                  * Fetch CSD from card.
1429                  */
1430                 err = mmc_send_csd(card, card->raw_csd);
1431                 if (err)
1432                         goto free_card;
1433
1434                 err = mmc_decode_csd(card);
1435                 if (err)
1436                         goto free_card;
1437                 err = mmc_decode_cid(card);
1438                 if (err)
1439                         goto free_card;
1440         }
1441
1442         /*
1443          * handling only for cards supporting DSR and hosts requesting
1444          * DSR configuration
1445          */
1446         if (card->csd.dsr_imp && host->dsr_req)
1447                 mmc_set_dsr(host);
1448
1449         /*
1450          * Select card, as all following commands rely on that.
1451          */
1452         if (!mmc_host_is_spi(host)) {
1453                 err = mmc_select_card(card);
1454                 if (err)
1455                         goto free_card;
1456         }
1457
1458         if (!oldcard) {
1459                 /* Read extended CSD. */
1460                 err = mmc_read_ext_csd(card);
1461                 if (err)
1462                         goto free_card;
1463
1464                 /* If doing byte addressing, check if required to do sector
1465                  * addressing.  Handle the case of <2GB cards needing sector
1466                  * addressing.  See section 8.1 JEDEC Standard JED84-A441;
1467                  * ocr register has bit 30 set for sector addressing.
1468                  */
1469                 if (!(mmc_card_blockaddr(card)) && (rocr & (1<<30)))
1470                         mmc_card_set_blockaddr(card);
1471
1472                 /* Erase size depends on CSD and Extended CSD */
1473                 mmc_set_erase_size(card);
1474         }
1475
1476         /*
1477          * If enhanced_area_en is TRUE, host needs to enable ERASE_GRP_DEF
1478          * bit.  This bit will be lost every time after a reset or power off.
1479          */
1480         if (card->ext_csd.partition_setting_completed ||
1481             (card->ext_csd.rev >= 3 && (host->caps2 & MMC_CAP2_HC_ERASE_SZ))) {
1482                 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
1483                                  EXT_CSD_ERASE_GROUP_DEF, 1,
1484                                  card->ext_csd.generic_cmd6_time);
1485
1486                 if (err && err != -EBADMSG)
1487                         goto free_card;
1488
1489                 if (err) {
1490                         err = 0;
1491                         /*
1492                          * Just disable enhanced area off & sz
1493                          * will try to enable ERASE_GROUP_DEF
1494                          * during next time reinit
1495                          */
1496                         card->ext_csd.enhanced_area_offset = -EINVAL;
1497                         card->ext_csd.enhanced_area_size = -EINVAL;
1498                 } else {
1499                         card->ext_csd.erase_group_def = 1;
1500                         /*
1501                          * enable ERASE_GRP_DEF successfully.
1502                          * This will affect the erase size, so
1503                          * here need to reset erase size
1504                          */
1505                         mmc_set_erase_size(card);
1506                 }
1507         }
1508
1509         /*
1510          * Ensure eMMC user default partition is enabled
1511          */
1512         if (card->ext_csd.part_config & EXT_CSD_PART_CONFIG_ACC_MASK) {
1513                 card->ext_csd.part_config &= ~EXT_CSD_PART_CONFIG_ACC_MASK;
1514                 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL, EXT_CSD_PART_CONFIG,
1515                                  card->ext_csd.part_config,
1516                                  card->ext_csd.part_time);
1517                 if (err && err != -EBADMSG)
1518                         goto free_card;
1519         }
1520
1521         /*
1522          * Enable power_off_notification byte in the ext_csd register
1523          */
1524         if (card->ext_csd.rev >= 6) {
1525                 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
1526                                  EXT_CSD_POWER_OFF_NOTIFICATION,
1527                                  EXT_CSD_POWER_ON,
1528                                  card->ext_csd.generic_cmd6_time);
1529                 if (err && err != -EBADMSG)
1530                         goto free_card;
1531
1532                 /*
1533                  * The err can be -EBADMSG or 0,
1534                  * so check for success and update the flag
1535                  */
1536                 if (!err)
1537                         card->ext_csd.power_off_notification = EXT_CSD_POWER_ON;
1538         }
1539
1540         /*
1541          * Select timing interface
1542          */
1543         err = mmc_select_timing(card);
1544         if (err)
1545                 goto free_card;
1546
1547         if (mmc_card_hs200(card)) {
1548                 err = mmc_hs200_tuning(card);
1549                 if (err)
1550                         goto free_card;
1551
1552                 err = mmc_select_hs400(card);
1553                 if (err)
1554                         goto free_card;
1555         } else if (mmc_card_hs(card)) {
1556                 /* Select the desired bus width optionally */
1557                 err = mmc_select_bus_width(card);
1558                 if (!IS_ERR_VALUE(err)) {
1559                         err = mmc_select_hs_ddr(card);
1560                         if (err)
1561                                 goto free_card;
1562                 }
1563         }
1564
1565         /*
1566          * Choose the power class with selected bus interface
1567          */
1568         mmc_select_powerclass(card);
1569
1570         /*
1571          * Enable HPI feature (if supported)
1572          */
1573         if (card->ext_csd.hpi) {
1574                 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
1575                                 EXT_CSD_HPI_MGMT, 1,
1576                                 card->ext_csd.generic_cmd6_time);
1577                 if (err && err != -EBADMSG)
1578                         goto free_card;
1579                 if (err) {
1580                         pr_warn("%s: Enabling HPI failed\n",
1581                                 mmc_hostname(card->host));
1582                         err = 0;
1583                 } else
1584                         card->ext_csd.hpi_en = 1;
1585         }
1586
1587         /*
1588          * If cache size is higher than 0, this indicates
1589          * the existence of cache and it can be turned on.
1590          */
1591         if (card->ext_csd.cache_size > 0) {
1592                 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
1593                                 EXT_CSD_CACHE_CTRL, 1,
1594                                 card->ext_csd.generic_cmd6_time);
1595                 if (err && err != -EBADMSG)
1596                         goto free_card;
1597
1598                 /*
1599                  * Only if no error, cache is turned on successfully.
1600                  */
1601                 if (err) {
1602                         pr_warn("%s: Cache is supported, but failed to turn on (%d)\n",
1603                                 mmc_hostname(card->host), err);
1604                         card->ext_csd.cache_ctrl = 0;
1605                         err = 0;
1606                 } else {
1607                         card->ext_csd.cache_ctrl = 1;
1608                 }
1609         }
1610
1611         /*
1612          * The mandatory minimum values are defined for packed command.
1613          * read: 5, write: 3
1614          */
1615         if (card->ext_csd.max_packed_writes >= 3 &&
1616             card->ext_csd.max_packed_reads >= 5 &&
1617             host->caps2 & MMC_CAP2_PACKED_CMD) {
1618                 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
1619                                 EXT_CSD_EXP_EVENTS_CTRL,
1620                                 EXT_CSD_PACKED_EVENT_EN,
1621                                 card->ext_csd.generic_cmd6_time);
1622                 if (err && err != -EBADMSG)
1623                         goto free_card;
1624                 if (err) {
1625                         pr_warn("%s: Enabling packed event failed\n",
1626                                 mmc_hostname(card->host));
1627                         card->ext_csd.packed_event_en = 0;
1628                         err = 0;
1629                 } else {
1630                         card->ext_csd.packed_event_en = 1;
1631                 }
1632         }
1633
1634         if (!oldcard)
1635                 host->card = card;
1636
1637         return 0;
1638
1639 free_card:
1640         if (!oldcard)
1641                 mmc_remove_card(card);
1642 err:
1643         return err;
1644 }
1645
1646 static int mmc_can_sleep(struct mmc_card *card)
1647 {
1648         return (card && card->ext_csd.rev >= 3);
1649 }
1650
1651 static int mmc_sleep(struct mmc_host *host)
1652 {
1653         struct mmc_command cmd = {0};
1654         struct mmc_card *card = host->card;
1655         unsigned int timeout_ms = DIV_ROUND_UP(card->ext_csd.sa_timeout, 10000);
1656         int err;
1657
1658         /* Re-tuning can't be done once the card is deselected */
1659         mmc_retune_hold(host);
1660
1661         err = mmc_deselect_cards(host);
1662         if (err)
1663                 goto out_release;
1664
1665         cmd.opcode = MMC_SLEEP_AWAKE;
1666         cmd.arg = card->rca << 16;
1667         cmd.arg |= 1 << 15;
1668
1669         /*
1670          * If the max_busy_timeout of the host is specified, validate it against
1671          * the sleep cmd timeout. A failure means we need to prevent the host
1672          * from doing hw busy detection, which is done by converting to a R1
1673          * response instead of a R1B.
1674          */
1675         if (host->max_busy_timeout && (timeout_ms > host->max_busy_timeout)) {
1676                 cmd.flags = MMC_RSP_R1 | MMC_CMD_AC;
1677         } else {
1678                 cmd.flags = MMC_RSP_R1B | MMC_CMD_AC;
1679                 cmd.busy_timeout = timeout_ms;
1680         }
1681
1682         err = mmc_wait_for_cmd(host, &cmd, 0);
1683         if (err)
1684                 goto out_release;
1685
1686         /*
1687          * If the host does not wait while the card signals busy, then we will
1688          * will have to wait the sleep/awake timeout.  Note, we cannot use the
1689          * SEND_STATUS command to poll the status because that command (and most
1690          * others) is invalid while the card sleeps.
1691          */
1692         if (!cmd.busy_timeout || !(host->caps & MMC_CAP_WAIT_WHILE_BUSY))
1693                 mmc_delay(timeout_ms);
1694
1695 out_release:
1696         mmc_retune_release(host);
1697         return err;
1698 }
1699
1700 static int mmc_can_poweroff_notify(const struct mmc_card *card)
1701 {
1702         return card &&
1703                 mmc_card_mmc(card) &&
1704                 (card->ext_csd.power_off_notification == EXT_CSD_POWER_ON);
1705 }
1706
1707 static int mmc_poweroff_notify(struct mmc_card *card, unsigned int notify_type)
1708 {
1709         unsigned int timeout = card->ext_csd.generic_cmd6_time;
1710         int err;
1711
1712         /* Use EXT_CSD_POWER_OFF_SHORT as default notification type. */
1713         if (notify_type == EXT_CSD_POWER_OFF_LONG)
1714                 timeout = card->ext_csd.power_off_longtime;
1715
1716         err = __mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
1717                         EXT_CSD_POWER_OFF_NOTIFICATION,
1718                         notify_type, timeout, true, false, false);
1719         if (err)
1720                 pr_err("%s: Power Off Notification timed out, %u\n",
1721                        mmc_hostname(card->host), timeout);
1722
1723         /* Disable the power off notification after the switch operation. */
1724         card->ext_csd.power_off_notification = EXT_CSD_NO_POWER_NOTIFICATION;
1725
1726         return err;
1727 }
1728
1729 /*
1730  * Host is being removed. Free up the current card.
1731  */
1732 static void mmc_remove(struct mmc_host *host)
1733 {
1734         BUG_ON(!host);
1735         BUG_ON(!host->card);
1736
1737         mmc_remove_card(host->card);
1738         host->card = NULL;
1739 }
1740
1741 /*
1742  * Card detection - card is alive.
1743  */
1744 static int mmc_alive(struct mmc_host *host)
1745 {
1746         return mmc_send_status(host->card, NULL);
1747 }
1748
1749 /*
1750  * Card detection callback from host.
1751  */
1752 static void mmc_detect(struct mmc_host *host)
1753 {
1754         int err;
1755
1756         BUG_ON(!host);
1757         BUG_ON(!host->card);
1758
1759         mmc_get_card(host->card);
1760
1761         /*
1762          * Just check if our card has been removed.
1763          */
1764         err = _mmc_detect_card_removed(host);
1765
1766         mmc_put_card(host->card);
1767
1768         if (err) {
1769                 mmc_remove(host);
1770
1771                 mmc_claim_host(host);
1772                 mmc_detach_bus(host);
1773                 mmc_power_off(host);
1774                 mmc_release_host(host);
1775         }
1776 }
1777
1778 static int _mmc_suspend(struct mmc_host *host, bool is_suspend)
1779 {
1780         int err = 0;
1781         unsigned int notify_type = is_suspend ? EXT_CSD_POWER_OFF_SHORT :
1782                                         EXT_CSD_POWER_OFF_LONG;
1783
1784         BUG_ON(!host);
1785         BUG_ON(!host->card);
1786
1787         mmc_claim_host(host);
1788
1789         if (mmc_card_suspended(host->card))
1790                 goto out;
1791
1792         if (mmc_card_doing_bkops(host->card)) {
1793                 err = mmc_stop_bkops(host->card);
1794                 if (err)
1795                         goto out;
1796         }
1797
1798         err = mmc_flush_cache(host->card);
1799         if (err)
1800                 goto out;
1801
1802         if (mmc_can_poweroff_notify(host->card) &&
1803                 ((host->caps2 & MMC_CAP2_FULL_PWR_CYCLE) || !is_suspend))
1804                 err = mmc_poweroff_notify(host->card, notify_type);
1805         else if (mmc_can_sleep(host->card))
1806                 err = mmc_sleep(host);
1807         else if (!mmc_host_is_spi(host))
1808                 err = mmc_deselect_cards(host);
1809
1810         if (!err) {
1811                 mmc_power_off(host);
1812                 mmc_card_set_suspended(host->card);
1813         }
1814 out:
1815         mmc_release_host(host);
1816         return err;
1817 }
1818
1819 /*
1820  * Suspend callback
1821  */
1822 static int mmc_suspend(struct mmc_host *host)
1823 {
1824         int err;
1825
1826         err = _mmc_suspend(host, true);
1827         if (!err) {
1828                 pm_runtime_disable(&host->card->dev);
1829                 pm_runtime_set_suspended(&host->card->dev);
1830         }
1831
1832         return err;
1833 }
1834
1835 /*
1836  * This function tries to determine if the same card is still present
1837  * and, if so, restore all state to it.
1838  */
1839 static int _mmc_resume(struct mmc_host *host)
1840 {
1841         int err = 0;
1842
1843         BUG_ON(!host);
1844         BUG_ON(!host->card);
1845
1846         mmc_claim_host(host);
1847
1848         if (!mmc_card_suspended(host->card))
1849                 goto out;
1850
1851         mmc_power_up(host, host->card->ocr);
1852         err = mmc_init_card(host, host->card->ocr, host->card);
1853         mmc_card_clr_suspended(host->card);
1854
1855 out:
1856         mmc_release_host(host);
1857         return err;
1858 }
1859
1860 /*
1861  * Shutdown callback
1862  */
1863 static int mmc_shutdown(struct mmc_host *host)
1864 {
1865         int err = 0;
1866
1867         /*
1868          * In a specific case for poweroff notify, we need to resume the card
1869          * before we can shutdown it properly.
1870          */
1871         if (mmc_can_poweroff_notify(host->card) &&
1872                 !(host->caps2 & MMC_CAP2_FULL_PWR_CYCLE))
1873                 err = _mmc_resume(host);
1874
1875         if (!err)
1876                 err = _mmc_suspend(host, false);
1877
1878         return err;
1879 }
1880
1881 /*
1882  * Callback for resume.
1883  */
1884 static int mmc_resume(struct mmc_host *host)
1885 {
1886         int err = 0;
1887
1888         if (!(host->caps & MMC_CAP_RUNTIME_RESUME)) {
1889                 err = _mmc_resume(host);
1890                 pm_runtime_set_active(&host->card->dev);
1891                 pm_runtime_mark_last_busy(&host->card->dev);
1892         }
1893         pm_runtime_enable(&host->card->dev);
1894
1895         return err;
1896 }
1897
1898 /*
1899  * Callback for runtime_suspend.
1900  */
1901 static int mmc_runtime_suspend(struct mmc_host *host)
1902 {
1903         int err;
1904
1905         if (!(host->caps & MMC_CAP_AGGRESSIVE_PM))
1906                 return 0;
1907
1908         err = _mmc_suspend(host, true);
1909         if (err)
1910                 pr_err("%s: error %d doing aggressive suspend\n",
1911                         mmc_hostname(host), err);
1912
1913         return err;
1914 }
1915
1916 /*
1917  * Callback for runtime_resume.
1918  */
1919 static int mmc_runtime_resume(struct mmc_host *host)
1920 {
1921         int err;
1922
1923         if (!(host->caps & (MMC_CAP_AGGRESSIVE_PM | MMC_CAP_RUNTIME_RESUME)))
1924                 return 0;
1925
1926         err = _mmc_resume(host);
1927         if (err)
1928                 pr_err("%s: error %d doing aggressive resume\n",
1929                         mmc_hostname(host), err);
1930
1931         return 0;
1932 }
1933
1934 int mmc_can_reset(struct mmc_card *card)
1935 {
1936         u8 rst_n_function;
1937
1938         rst_n_function = card->ext_csd.rst_n_function;
1939         if ((rst_n_function & EXT_CSD_RST_N_EN_MASK) != EXT_CSD_RST_N_ENABLED)
1940                 return 0;
1941         return 1;
1942 }
1943 EXPORT_SYMBOL(mmc_can_reset);
1944
1945 static int mmc_reset(struct mmc_host *host)
1946 {
1947         struct mmc_card *card = host->card;
1948
1949         if (!(host->caps & MMC_CAP_HW_RESET) || !host->ops->hw_reset)
1950                 return -EOPNOTSUPP;
1951
1952         if (!mmc_can_reset(card))
1953                 return -EOPNOTSUPP;
1954
1955         mmc_set_clock(host, host->f_init);
1956
1957         host->ops->hw_reset(host);
1958
1959         /* Set initial state and call mmc_set_ios */
1960         mmc_set_initial_state(host);
1961
1962         return mmc_init_card(host, card->ocr, card);
1963 }
1964
1965 static const struct mmc_bus_ops mmc_ops = {
1966         .remove = mmc_remove,
1967         .detect = mmc_detect,
1968         .suspend = mmc_suspend,
1969         .resume = mmc_resume,
1970         .runtime_suspend = mmc_runtime_suspend,
1971         .runtime_resume = mmc_runtime_resume,
1972         .alive = mmc_alive,
1973         .shutdown = mmc_shutdown,
1974         .reset = mmc_reset,
1975 };
1976
1977 /*
1978  * Starting point for MMC card init.
1979  */
1980 int mmc_attach_mmc(struct mmc_host *host)
1981 {
1982         int err;
1983         u32 ocr, rocr;
1984
1985         BUG_ON(!host);
1986         WARN_ON(!host->claimed);
1987
1988         /* Set correct bus mode for MMC before attempting attach */
1989         if (!mmc_host_is_spi(host))
1990                 mmc_set_bus_mode(host, MMC_BUSMODE_OPENDRAIN);
1991
1992         err = mmc_send_op_cond(host, 0, &ocr);
1993         if (err)
1994                 return err;
1995
1996         mmc_attach_bus(host, &mmc_ops);
1997         if (host->ocr_avail_mmc)
1998                 host->ocr_avail = host->ocr_avail_mmc;
1999
2000         /*
2001          * We need to get OCR a different way for SPI.
2002          */
2003         if (mmc_host_is_spi(host)) {
2004                 err = mmc_spi_read_ocr(host, 1, &ocr);
2005                 if (err)
2006                         goto err;
2007         }
2008
2009         rocr = mmc_select_voltage(host, ocr);
2010
2011         /*
2012          * Can we support the voltage of the card?
2013          */
2014         if (!rocr) {
2015                 err = -EINVAL;
2016                 goto err;
2017         }
2018
2019         /*
2020          * Detect and init the card.
2021          */
2022         err = mmc_init_card(host, rocr, NULL);
2023         if (err)
2024                 goto err;
2025
2026         mmc_release_host(host);
2027         err = mmc_add_card(host->card);
2028         if (err)
2029                 goto remove_card;
2030
2031         mmc_claim_host(host);
2032         return 0;
2033
2034 remove_card:
2035         mmc_remove_card(host->card);
2036         mmc_claim_host(host);
2037         host->card = NULL;
2038 err:
2039         mmc_detach_bus(host);
2040
2041         pr_err("%s: error %d whilst initialising MMC card\n",
2042                 mmc_hostname(host), err);
2043
2044         return err;
2045 }