/* * linux/drivers/mmc/core/mmc.c * * Copyright (C) 2003-2004 Russell King, All Rights Reserved. * Copyright (C) 2005-2007 Pierre Ossman, All Rights Reserved. * MMCv4 support Copyright (C) 2006 Philip Langdale, All Rights Reserved. * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License version 2 as * published by the Free Software Foundation. */ #include #include #include #include #include #include #include "core.h" #include "bus.h" #include "mmc_ops.h" #include "sd_ops.h" static const unsigned int tran_exp[] = { 10000, 100000, 1000000, 10000000, 0, 0, 0, 0 }; static const unsigned char tran_mant[] = { 0, 10, 12, 13, 15, 20, 25, 30, 35, 40, 45, 50, 55, 60, 70, 80, }; static const unsigned int tacc_exp[] = { 1, 10, 100, 1000, 10000, 100000, 1000000, 10000000, }; static const unsigned int tacc_mant[] = { 0, 10, 12, 13, 15, 20, 25, 30, 35, 40, 45, 50, 55, 60, 70, 80, }; #define UNSTUFF_BITS(resp,start,size) \ ({ \ const int __size = size; \ const u32 __mask = (__size < 32 ? 1 << __size : 0) - 1; \ const int __off = 3 - ((start) / 32); \ const int __shft = (start) & 31; \ u32 __res; \ \ __res = resp[__off] >> __shft; \ if (__size + __shft > 32) \ __res |= resp[__off-1] << ((32 - __shft) % 32); \ __res & __mask; \ }) /* * Given the decoded CSD structure, decode the raw CID to our CID structure. */ static int mmc_decode_cid(struct mmc_card *card) { u32 *resp = card->raw_cid; /* * The selection of the format here is based upon published * specs from sandisk and from what people have reported. */ switch (card->csd.mmca_vsn) { case 0: /* MMC v1.0 - v1.2 */ case 1: /* MMC v1.4 */ card->cid.manfid = UNSTUFF_BITS(resp, 104, 24); card->cid.prod_name[0] = UNSTUFF_BITS(resp, 96, 8); card->cid.prod_name[1] = UNSTUFF_BITS(resp, 88, 8); card->cid.prod_name[2] = UNSTUFF_BITS(resp, 80, 8); card->cid.prod_name[3] = UNSTUFF_BITS(resp, 72, 8); card->cid.prod_name[4] = UNSTUFF_BITS(resp, 64, 8); card->cid.prod_name[5] = UNSTUFF_BITS(resp, 56, 8); card->cid.prod_name[6] = UNSTUFF_BITS(resp, 48, 8); card->cid.hwrev = UNSTUFF_BITS(resp, 44, 4); card->cid.fwrev = UNSTUFF_BITS(resp, 40, 4); card->cid.serial = UNSTUFF_BITS(resp, 16, 24); card->cid.month = UNSTUFF_BITS(resp, 12, 4); card->cid.year = UNSTUFF_BITS(resp, 8, 4) + 1997; break; case 2: /* MMC v2.0 - v2.2 */ case 3: /* MMC v3.1 - v3.3 */ case 4: /* MMC v4 */ card->cid.manfid = UNSTUFF_BITS(resp, 120, 8); card->cid.oemid = UNSTUFF_BITS(resp, 104, 16); card->cid.prod_name[0] = UNSTUFF_BITS(resp, 96, 8); card->cid.prod_name[1] = UNSTUFF_BITS(resp, 88, 8); card->cid.prod_name[2] = UNSTUFF_BITS(resp, 80, 8); card->cid.prod_name[3] = UNSTUFF_BITS(resp, 72, 8); card->cid.prod_name[4] = UNSTUFF_BITS(resp, 64, 8); card->cid.prod_name[5] = UNSTUFF_BITS(resp, 56, 8); card->cid.serial = UNSTUFF_BITS(resp, 16, 32); card->cid.month = UNSTUFF_BITS(resp, 12, 4); card->cid.year = UNSTUFF_BITS(resp, 8, 4) + 1997; break; default: pr_err("%s: card has unknown MMCA version %d\n", mmc_hostname(card->host), card->csd.mmca_vsn); return -EINVAL; } return 0; } static void mmc_set_erase_size(struct mmc_card *card) { if (card->ext_csd.erase_group_def & 1) card->erase_size = card->ext_csd.hc_erase_size; else card->erase_size = card->csd.erase_size; mmc_init_erase(card); } /* * Given a 128-bit response, decode to our card CSD structure. */ static int mmc_decode_csd(struct mmc_card *card) { struct mmc_csd *csd = &card->csd; unsigned int e, m, a, b; u32 *resp = card->raw_csd; /* * We only understand CSD structure v1.1 and v1.2. * v1.2 has extra information in bits 15, 11 and 10. * We also support eMMC v4.4 & v4.41. */ csd->structure = UNSTUFF_BITS(resp, 126, 2); if (csd->structure == 0) { pr_err("%s: unrecognised CSD structure version %d\n", mmc_hostname(card->host), csd->structure); return -EINVAL; } csd->mmca_vsn = UNSTUFF_BITS(resp, 122, 4); m = UNSTUFF_BITS(resp, 115, 4); e = UNSTUFF_BITS(resp, 112, 3); csd->tacc_ns = (tacc_exp[e] * tacc_mant[m] + 9) / 10; csd->tacc_clks = UNSTUFF_BITS(resp, 104, 8) * 100; m = UNSTUFF_BITS(resp, 99, 4); e = UNSTUFF_BITS(resp, 96, 3); csd->max_dtr = tran_exp[e] * tran_mant[m]; csd->cmdclass = UNSTUFF_BITS(resp, 84, 12); e = UNSTUFF_BITS(resp, 47, 3); m = UNSTUFF_BITS(resp, 62, 12); csd->capacity = (1 + m) << (e + 2); csd->read_blkbits = UNSTUFF_BITS(resp, 80, 4); csd->read_partial = UNSTUFF_BITS(resp, 79, 1); csd->write_misalign = UNSTUFF_BITS(resp, 78, 1); csd->read_misalign = UNSTUFF_BITS(resp, 77, 1); csd->r2w_factor = UNSTUFF_BITS(resp, 26, 3); csd->write_blkbits = UNSTUFF_BITS(resp, 22, 4); csd->write_partial = UNSTUFF_BITS(resp, 21, 1); if (csd->write_blkbits >= 9) { a = UNSTUFF_BITS(resp, 42, 5); b = UNSTUFF_BITS(resp, 37, 5); csd->erase_size = (a + 1) * (b + 1); csd->erase_size <<= csd->write_blkbits - 9; } return 0; } /* * Read extended CSD. */ static int mmc_get_ext_csd(struct mmc_card *card, u8 **new_ext_csd) { int err; u8 *ext_csd; BUG_ON(!card); BUG_ON(!new_ext_csd); *new_ext_csd = NULL; if (card->csd.mmca_vsn < CSD_SPEC_VER_4) return 0; /* * As the ext_csd is so large and mostly unused, we don't store the * raw block in mmc_card. */ ext_csd = kmalloc(512, GFP_KERNEL); if (!ext_csd) { pr_err("%s: could not allocate a buffer to " "receive the ext_csd.\n", mmc_hostname(card->host)); return -ENOMEM; } err = mmc_send_ext_csd(card, ext_csd); if (err) { kfree(ext_csd); *new_ext_csd = NULL; /* If the host or the card can't do the switch, * fail more gracefully. */ if ((err != -EINVAL) && (err != -ENOSYS) && (err != -EFAULT)) return err; /* * High capacity cards should have this "magic" size * stored in their CSD. */ if (card->csd.capacity == (4096 * 512)) { pr_err("%s: unable to read EXT_CSD " "on a possible high capacity card. " "Card will be ignored.\n", mmc_hostname(card->host)); } else { pr_warning("%s: unable to read " "EXT_CSD, performance might " "suffer.\n", mmc_hostname(card->host)); err = 0; } } else *new_ext_csd = ext_csd; return err; } /* * Decode extended CSD. */ static int mmc_read_ext_csd(struct mmc_card *card, u8 *ext_csd) { int err = 0, idx; unsigned int part_size; u8 hc_erase_grp_sz = 0, hc_wp_grp_sz = 0; BUG_ON(!card); if (!ext_csd) return 0; /* Version is coded in the CSD_STRUCTURE byte in the EXT_CSD register */ card->ext_csd.raw_ext_csd_structure = ext_csd[EXT_CSD_STRUCTURE]; if (card->csd.structure == 3) { if (card->ext_csd.raw_ext_csd_structure > 2) { pr_err("%s: unrecognised EXT_CSD structure " "version %d\n", mmc_hostname(card->host), card->ext_csd.raw_ext_csd_structure); err = -EINVAL; goto out; } } card->ext_csd.rev = ext_csd[EXT_CSD_REV]; if (card->ext_csd.rev > 6) { pr_err("%s: unrecognised EXT_CSD revision %d\n", mmc_hostname(card->host), card->ext_csd.rev); err = -EINVAL; goto out; } card->ext_csd.raw_sectors[0] = ext_csd[EXT_CSD_SEC_CNT + 0]; card->ext_csd.raw_sectors[1] = ext_csd[EXT_CSD_SEC_CNT + 1]; card->ext_csd.raw_sectors[2] = ext_csd[EXT_CSD_SEC_CNT + 2]; card->ext_csd.raw_sectors[3] = ext_csd[EXT_CSD_SEC_CNT + 3]; if (card->ext_csd.rev >= 2) { card->ext_csd.sectors = ext_csd[EXT_CSD_SEC_CNT + 0] << 0 | ext_csd[EXT_CSD_SEC_CNT + 1] << 8 | ext_csd[EXT_CSD_SEC_CNT + 2] << 16 | ext_csd[EXT_CSD_SEC_CNT + 3] << 24; /* Cards with density > 2GiB are sector addressed */ if (card->ext_csd.sectors > (2u * 1024 * 1024 * 1024) / 512) mmc_card_set_blockaddr(card); } card->ext_csd.raw_card_type = ext_csd[EXT_CSD_CARD_TYPE]; switch (ext_csd[EXT_CSD_CARD_TYPE] & EXT_CSD_CARD_TYPE_MASK) { case EXT_CSD_CARD_TYPE_SDR_ALL: case EXT_CSD_CARD_TYPE_SDR_ALL_DDR_1_8V: case EXT_CSD_CARD_TYPE_SDR_ALL_DDR_1_2V: case EXT_CSD_CARD_TYPE_SDR_ALL_DDR_52: card->ext_csd.hs_max_dtr = 200000000; card->ext_csd.card_type = EXT_CSD_CARD_TYPE_SDR_200; break; case EXT_CSD_CARD_TYPE_SDR_1_2V_ALL: case EXT_CSD_CARD_TYPE_SDR_1_2V_DDR_1_8V: case EXT_CSD_CARD_TYPE_SDR_1_2V_DDR_1_2V: case EXT_CSD_CARD_TYPE_SDR_1_2V_DDR_52: card->ext_csd.hs_max_dtr = 200000000; card->ext_csd.card_type = EXT_CSD_CARD_TYPE_SDR_1_2V; break; case EXT_CSD_CARD_TYPE_SDR_1_8V_ALL: case EXT_CSD_CARD_TYPE_SDR_1_8V_DDR_1_8V: case EXT_CSD_CARD_TYPE_SDR_1_8V_DDR_1_2V: case EXT_CSD_CARD_TYPE_SDR_1_8V_DDR_52: card->ext_csd.hs_max_dtr = 200000000; card->ext_csd.card_type = EXT_CSD_CARD_TYPE_SDR_1_8V; break; case EXT_CSD_CARD_TYPE_DDR_52 | EXT_CSD_CARD_TYPE_52 | EXT_CSD_CARD_TYPE_26: card->ext_csd.hs_max_dtr = 52000000; card->ext_csd.card_type = EXT_CSD_CARD_TYPE_DDR_52; break; case EXT_CSD_CARD_TYPE_DDR_1_2V | EXT_CSD_CARD_TYPE_52 | EXT_CSD_CARD_TYPE_26: card->ext_csd.hs_max_dtr = 52000000; card->ext_csd.card_type = EXT_CSD_CARD_TYPE_DDR_1_2V; break; case EXT_CSD_CARD_TYPE_DDR_1_8V | EXT_CSD_CARD_TYPE_52 | EXT_CSD_CARD_TYPE_26: card->ext_csd.hs_max_dtr = 52000000; card->ext_csd.card_type = EXT_CSD_CARD_TYPE_DDR_1_8V; break; case EXT_CSD_CARD_TYPE_52 | EXT_CSD_CARD_TYPE_26: card->ext_csd.hs_max_dtr = 52000000; break; case EXT_CSD_CARD_TYPE_26: card->ext_csd.hs_max_dtr = 26000000; break; default: /* MMC v4 spec says this cannot happen */ pr_warning("%s: card is mmc v4 but doesn't " "support any high-speed modes.\n", mmc_hostname(card->host)); } card->ext_csd.raw_s_a_timeout = ext_csd[EXT_CSD_S_A_TIMEOUT]; card->ext_csd.raw_erase_timeout_mult = ext_csd[EXT_CSD_ERASE_TIMEOUT_MULT]; card->ext_csd.raw_hc_erase_grp_size = ext_csd[EXT_CSD_HC_ERASE_GRP_SIZE]; if (card->ext_csd.rev >= 3) { u8 sa_shift = ext_csd[EXT_CSD_S_A_TIMEOUT]; card->ext_csd.part_config = ext_csd[EXT_CSD_PART_CONFIG]; /* EXT_CSD value is in units of 10ms, but we store in ms */ card->ext_csd.part_time = 10 * ext_csd[EXT_CSD_PART_SWITCH_TIME]; /* Sleep / awake timeout in 100ns units */ if (sa_shift > 0 && sa_shift <= 0x17) card->ext_csd.sa_timeout = 1 << ext_csd[EXT_CSD_S_A_TIMEOUT]; card->ext_csd.erase_group_def = ext_csd[EXT_CSD_ERASE_GROUP_DEF]; card->ext_csd.hc_erase_timeout = 300 * ext_csd[EXT_CSD_ERASE_TIMEOUT_MULT]; card->ext_csd.hc_erase_size = ext_csd[EXT_CSD_HC_ERASE_GRP_SIZE] << 10; card->ext_csd.rel_sectors = ext_csd[EXT_CSD_REL_WR_SEC_C]; /* * There are two boot regions of equal size, defined in * multiples of 128K. */ if (ext_csd[EXT_CSD_BOOT_MULT] && mmc_boot_partition_access(card->host)) { for (idx = 0; idx < MMC_NUM_BOOT_PARTITION; idx++) { part_size = ext_csd[EXT_CSD_BOOT_MULT] << 17; mmc_part_add(card, part_size, EXT_CSD_PART_CONFIG_ACC_BOOT0 + idx, "boot%d", idx, true, MMC_BLK_DATA_AREA_BOOT); } } } card->ext_csd.raw_hc_erase_gap_size = ext_csd[EXT_CSD_HC_WP_GRP_SIZE]; card->ext_csd.raw_sec_trim_mult = ext_csd[EXT_CSD_SEC_TRIM_MULT]; card->ext_csd.raw_sec_erase_mult = ext_csd[EXT_CSD_SEC_ERASE_MULT]; card->ext_csd.raw_sec_feature_support = ext_csd[EXT_CSD_SEC_FEATURE_SUPPORT]; card->ext_csd.raw_trim_mult = ext_csd[EXT_CSD_TRIM_MULT]; card->ext_csd.raw_partition_support = ext_csd[EXT_CSD_PARTITION_SUPPORT]; if (card->ext_csd.rev >= 4) { /* * Enhanced area feature support -- check whether the eMMC * card has the Enhanced area enabled. If so, export enhanced * area offset and size to user by adding sysfs interface. */ if ((ext_csd[EXT_CSD_PARTITION_SUPPORT] & 0x2) && (ext_csd[EXT_CSD_PARTITION_ATTRIBUTE] & 0x1)) { hc_erase_grp_sz = ext_csd[EXT_CSD_HC_ERASE_GRP_SIZE]; hc_wp_grp_sz = ext_csd[EXT_CSD_HC_WP_GRP_SIZE]; card->ext_csd.enhanced_area_en = 1; /* * calculate the enhanced data area offset, in bytes */ card->ext_csd.enhanced_area_offset = (ext_csd[139] << 24) + (ext_csd[138] << 16) + (ext_csd[137] << 8) + ext_csd[136]; if (mmc_card_blockaddr(card)) card->ext_csd.enhanced_area_offset <<= 9; /* * calculate the enhanced data area size, in kilobytes */ card->ext_csd.enhanced_area_size = (ext_csd[142] << 16) + (ext_csd[141] << 8) + ext_csd[140]; card->ext_csd.enhanced_area_size *= (size_t)(hc_erase_grp_sz * hc_wp_grp_sz); card->ext_csd.enhanced_area_size <<= 9; } else { /* * If the enhanced area is not enabled, disable these * device attributes. */ card->ext_csd.enhanced_area_offset = -EINVAL; card->ext_csd.enhanced_area_size = -EINVAL; } /* * General purpose partition feature support -- * If ext_csd has the size of general purpose partitions, * set size, part_cfg, partition name in mmc_part. */ if (ext_csd[EXT_CSD_PARTITION_SUPPORT] & EXT_CSD_PART_SUPPORT_PART_EN) { if (card->ext_csd.enhanced_area_en != 1) { hc_erase_grp_sz = ext_csd[EXT_CSD_HC_ERASE_GRP_SIZE]; hc_wp_grp_sz = ext_csd[EXT_CSD_HC_WP_GRP_SIZE]; card->ext_csd.enhanced_area_en = 1; } for (idx = 0; idx < MMC_NUM_GP_PARTITION; idx++) { if (!ext_csd[EXT_CSD_GP_SIZE_MULT + idx * 3] && !ext_csd[EXT_CSD_GP_SIZE_MULT + idx * 3 + 1] && !ext_csd[EXT_CSD_GP_SIZE_MULT + idx * 3 + 2]) continue; part_size = (ext_csd[EXT_CSD_GP_SIZE_MULT + idx * 3 + 2] << 16) + (ext_csd[EXT_CSD_GP_SIZE_MULT + idx * 3 + 1] << 8) + ext_csd[EXT_CSD_GP_SIZE_MULT + idx * 3]; part_size *= (size_t)(hc_erase_grp_sz * hc_wp_grp_sz); mmc_part_add(card, part_size << 19, EXT_CSD_PART_CONFIG_ACC_GP0 + idx, "gp%d", idx, false, MMC_BLK_DATA_AREA_GP); } } card->ext_csd.sec_trim_mult = ext_csd[EXT_CSD_SEC_TRIM_MULT]; card->ext_csd.sec_erase_mult = ext_csd[EXT_CSD_SEC_ERASE_MULT]; card->ext_csd.sec_feature_support = ext_csd[EXT_CSD_SEC_FEATURE_SUPPORT]; card->ext_csd.trim_timeout = 300 * ext_csd[EXT_CSD_TRIM_MULT]; /* * Note that the call to mmc_part_add above defaults to read * only. If this default assumption is changed, the call must * take into account the value of boot_locked below. */ card->ext_csd.boot_ro_lock = ext_csd[EXT_CSD_BOOT_WP]; card->ext_csd.boot_ro_lockable = true; } if (card->ext_csd.rev >= 5) { /* check whether the eMMC card supports HPI */ if (ext_csd[EXT_CSD_HPI_FEATURES] & 0x1) { card->ext_csd.hpi = 1; if (ext_csd[EXT_CSD_HPI_FEATURES] & 0x2) card->ext_csd.hpi_cmd = MMC_STOP_TRANSMISSION; else card->ext_csd.hpi_cmd = MMC_SEND_STATUS; /* * Indicate the maximum timeout to close * a command interrupted by HPI */ card->ext_csd.out_of_int_time = ext_csd[EXT_CSD_OUT_OF_INTERRUPT_TIME] * 10; } card->ext_csd.rel_param = ext_csd[EXT_CSD_WR_REL_PARAM]; card->ext_csd.rst_n_function = ext_csd[EXT_CSD_RST_N_FUNCTION]; } card->ext_csd.raw_erased_mem_count = ext_csd[EXT_CSD_ERASED_MEM_CONT]; if (ext_csd[EXT_CSD_ERASED_MEM_CONT]) card->erased_byte = 0xFF; else card->erased_byte = 0x0; /* eMMC v4.5 or later */ if (card->ext_csd.rev >= 6) { card->ext_csd.feature_support |= MMC_DISCARD_FEATURE; card->ext_csd.generic_cmd6_time = 10 * ext_csd[EXT_CSD_GENERIC_CMD6_TIME]; card->ext_csd.power_off_longtime = 10 * ext_csd[EXT_CSD_POWER_OFF_LONG_TIME]; card->ext_csd.cache_size = ext_csd[EXT_CSD_CACHE_SIZE + 0] << 0 | ext_csd[EXT_CSD_CACHE_SIZE + 1] << 8 | ext_csd[EXT_CSD_CACHE_SIZE + 2] << 16 | ext_csd[EXT_CSD_CACHE_SIZE + 3] << 24; if (ext_csd[EXT_CSD_DATA_SECTOR_SIZE] == 1) card->ext_csd.data_sector_size = 4096; else card->ext_csd.data_sector_size = 512; if ((ext_csd[EXT_CSD_DATA_TAG_SUPPORT] & 1) && (ext_csd[EXT_CSD_TAG_UNIT_SIZE] <= 8)) { card->ext_csd.data_tag_unit_size = ((unsigned int) 1 << ext_csd[EXT_CSD_TAG_UNIT_SIZE]) * (card->ext_csd.data_sector_size); } else { card->ext_csd.data_tag_unit_size = 0; } } out: return err; } static inline void mmc_free_ext_csd(u8 *ext_csd) { kfree(ext_csd); } static int mmc_compare_ext_csds(struct mmc_card *card, unsigned bus_width) { u8 *bw_ext_csd; int err; if (bus_width == MMC_BUS_WIDTH_1) return 0; err = mmc_get_ext_csd(card, &bw_ext_csd); if (err || bw_ext_csd == NULL) { if (bus_width != MMC_BUS_WIDTH_1) err = -EINVAL; goto out; } if (bus_width == MMC_BUS_WIDTH_1) goto out; /* only compare read only fields */ err = !((card->ext_csd.raw_partition_support == bw_ext_csd[EXT_CSD_PARTITION_SUPPORT]) && (card->ext_csd.raw_erased_mem_count == bw_ext_csd[EXT_CSD_ERASED_MEM_CONT]) && (card->ext_csd.rev == bw_ext_csd[EXT_CSD_REV]) && (card->ext_csd.raw_ext_csd_structure == bw_ext_csd[EXT_CSD_STRUCTURE]) && (card->ext_csd.raw_card_type == bw_ext_csd[EXT_CSD_CARD_TYPE]) && (card->ext_csd.raw_s_a_timeout == bw_ext_csd[EXT_CSD_S_A_TIMEOUT]) && (card->ext_csd.raw_hc_erase_gap_size == bw_ext_csd[EXT_CSD_HC_WP_GRP_SIZE]) && (card->ext_csd.raw_erase_timeout_mult == bw_ext_csd[EXT_CSD_ERASE_TIMEOUT_MULT]) && (card->ext_csd.raw_hc_erase_grp_size == bw_ext_csd[EXT_CSD_HC_ERASE_GRP_SIZE]) && (card->ext_csd.raw_sec_trim_mult == bw_ext_csd[EXT_CSD_SEC_TRIM_MULT]) && (card->ext_csd.raw_sec_erase_mult == bw_ext_csd[EXT_CSD_SEC_ERASE_MULT]) && (card->ext_csd.raw_sec_feature_support == bw_ext_csd[EXT_CSD_SEC_FEATURE_SUPPORT]) && (card->ext_csd.raw_trim_mult == bw_ext_csd[EXT_CSD_TRIM_MULT]) && (card->ext_csd.raw_sectors[0] == bw_ext_csd[EXT_CSD_SEC_CNT + 0]) && (card->ext_csd.raw_sectors[1] == bw_ext_csd[EXT_CSD_SEC_CNT + 1]) && (card->ext_csd.raw_sectors[2] == bw_ext_csd[EXT_CSD_SEC_CNT + 2]) && (card->ext_csd.raw_sectors[3] == bw_ext_csd[EXT_CSD_SEC_CNT + 3])); if (err) err = -EINVAL; out: mmc_free_ext_csd(bw_ext_csd); return err; } MMC_DEV_ATTR(cid, "%08x%08x%08x%08x\n", card->raw_cid[0], card->raw_cid[1], card->raw_cid[2], card->raw_cid[3]); MMC_DEV_ATTR(csd, "%08x%08x%08x%08x\n", card->raw_csd[0], card->raw_csd[1], card->raw_csd[2], card->raw_csd[3]); MMC_DEV_ATTR(date, "%02d/%04d\n", card->cid.month, card->cid.year); MMC_DEV_ATTR(erase_size, "%u\n", card->erase_size << 9); MMC_DEV_ATTR(preferred_erase_size, "%u\n", card->pref_erase << 9); MMC_DEV_ATTR(fwrev, "0x%x\n", card->cid.fwrev); MMC_DEV_ATTR(hwrev, "0x%x\n", card->cid.hwrev); MMC_DEV_ATTR(manfid, "0x%06x\n", card->cid.manfid); MMC_DEV_ATTR(name, "%s\n", card->cid.prod_name); MMC_DEV_ATTR(oemid, "0x%04x\n", card->cid.oemid); MMC_DEV_ATTR(serial, "0x%08x\n", card->cid.serial); MMC_DEV_ATTR(enhanced_area_offset, "%llu\n", card->ext_csd.enhanced_area_offset); MMC_DEV_ATTR(enhanced_area_size, "%u\n", card->ext_csd.enhanced_area_size); static struct attribute *mmc_std_attrs[] = { &dev_attr_cid.attr, &dev_attr_csd.attr, &dev_attr_date.attr, &dev_attr_erase_size.attr, &dev_attr_preferred_erase_size.attr, &dev_attr_fwrev.attr, &dev_attr_hwrev.attr, &dev_attr_manfid.attr, &dev_attr_name.attr, &dev_attr_oemid.attr, &dev_attr_serial.attr, &dev_attr_enhanced_area_offset.attr, &dev_attr_enhanced_area_size.attr, NULL, }; static struct attribute_group mmc_std_attr_group = { .attrs = mmc_std_attrs, }; static const struct attribute_group *mmc_attr_groups[] = { &mmc_std_attr_group, NULL, }; static struct device_type mmc_type = { .groups = mmc_attr_groups, }; /* * Select the PowerClass for the current bus width * If power class is defined for 4/8 bit bus in the * extended CSD register, select it by executing the * mmc_switch command. */ static int mmc_select_powerclass(struct mmc_card *card, unsigned int bus_width, u8 *ext_csd) { int err = 0; unsigned int pwrclass_val; unsigned int index = 0; struct mmc_host *host; BUG_ON(!card); host = card->host; BUG_ON(!host); if (ext_csd == NULL) return 0; /* Power class selection is supported for versions >= 4.0 */ if (card->csd.mmca_vsn < CSD_SPEC_VER_4) return 0; /* Power class values are defined only for 4/8 bit bus */ if (bus_width == EXT_CSD_BUS_WIDTH_1) return 0; switch (1 << host->ios.vdd) { case MMC_VDD_165_195: if (host->ios.clock <= 26000000) index = EXT_CSD_PWR_CL_26_195; else if (host->ios.clock <= 52000000) index = (bus_width <= EXT_CSD_BUS_WIDTH_8) ? EXT_CSD_PWR_CL_52_195 : EXT_CSD_PWR_CL_DDR_52_195; else if (host->ios.clock <= 200000000) index = EXT_CSD_PWR_CL_200_195; break; case MMC_VDD_27_28: case MMC_VDD_28_29: case MMC_VDD_29_30: case MMC_VDD_30_31: case MMC_VDD_31_32: case MMC_VDD_32_33: case MMC_VDD_33_34: case MMC_VDD_34_35: case MMC_VDD_35_36: if (host->ios.clock <= 26000000) index = EXT_CSD_PWR_CL_26_360; else if (host->ios.clock <= 52000000) index = (bus_width <= EXT_CSD_BUS_WIDTH_8) ? EXT_CSD_PWR_CL_52_360 : EXT_CSD_PWR_CL_DDR_52_360; else if (host->ios.clock <= 200000000) index = EXT_CSD_PWR_CL_200_360; break; default: pr_warning("%s: Voltage range not supported " "for power class.\n", mmc_hostname(host)); return -EINVAL; } pwrclass_val = ext_csd[index]; if (bus_width & (EXT_CSD_BUS_WIDTH_8 | EXT_CSD_DDR_BUS_WIDTH_8)) pwrclass_val = (pwrclass_val & EXT_CSD_PWR_CL_8BIT_MASK) >> EXT_CSD_PWR_CL_8BIT_SHIFT; else pwrclass_val = (pwrclass_val & EXT_CSD_PWR_CL_4BIT_MASK) >> EXT_CSD_PWR_CL_4BIT_SHIFT; /* If the power class is different from the default value */ if (pwrclass_val > 0) { err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL, EXT_CSD_POWER_CLASS, pwrclass_val, card->ext_csd.generic_cmd6_time); } return err; } /* * Selects the desired buswidth and switch to the HS200 mode * if bus width set without error */ static int mmc_select_hs200(struct mmc_card *card) { int idx, err = 0; struct mmc_host *host; static unsigned ext_csd_bits[] = { EXT_CSD_BUS_WIDTH_4, EXT_CSD_BUS_WIDTH_8, }; static unsigned bus_widths[] = { MMC_BUS_WIDTH_4, MMC_BUS_WIDTH_8, }; BUG_ON(!card); host = card->host; if (card->ext_csd.card_type & EXT_CSD_CARD_TYPE_SDR_1_2V && host->caps2 & MMC_CAP2_HS200_1_2V_SDR) if (mmc_set_signal_voltage(host, MMC_SIGNAL_VOLTAGE_120, 0)) err = mmc_set_signal_voltage(host, MMC_SIGNAL_VOLTAGE_180, 0); /* If fails try again during next card power cycle */ if (err) goto err; idx = (host->caps & MMC_CAP_8_BIT_DATA) ? 1 : 0; /* * Unlike SD, MMC cards dont have a configuration register to notify * supported bus width. So bus test command should be run to identify * the supported bus width or compare the ext csd values of current * bus width and ext csd values of 1 bit mode read earlier. */ for (; idx >= 0; idx--) { /* * Host is capable of 8bit transfer, then switch * the device to work in 8bit transfer mode. If the * mmc switch command returns error then switch to * 4bit transfer mode. On success set the corresponding * bus width on the host. */ err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL, EXT_CSD_BUS_WIDTH, ext_csd_bits[idx], card->ext_csd.generic_cmd6_time); if (err) continue; mmc_set_bus_width(card->host, bus_widths[idx]); if (!(host->caps & MMC_CAP_BUS_WIDTH_TEST)) err = mmc_compare_ext_csds(card, bus_widths[idx]); else err = mmc_bus_test(card, bus_widths[idx]); if (!err) break; } /* switch to HS200 mode if bus width set successfully */ if (!err) err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL, EXT_CSD_HS_TIMING, 2, 0); err: return err; } /* * Handle the detection and initialisation of a card. * * In the case of a resume, "oldcard" will contain the card * we're trying to reinitialise. */ static int mmc_init_card(struct mmc_host *host, u32 ocr, struct mmc_card *oldcard) { struct mmc_card *card; int err, ddr = 0; u32 cid[4]; unsigned int max_dtr; u32 rocr; u8 *ext_csd = NULL; BUG_ON(!host); WARN_ON(!host->claimed); /* Set correct bus mode for MMC before attempting init */ if (!mmc_host_is_spi(host)) mmc_set_bus_mode(host, MMC_BUSMODE_OPENDRAIN); /* Initialization should be done at 3.3 V I/O voltage. */ mmc_set_signal_voltage(host, MMC_SIGNAL_VOLTAGE_330, 0); /* * Since we're changing the OCR value, we seem to * need to tell some cards to go back to the idle * state. We wait 1ms to give cards time to * respond. * mmc_go_idle is needed for eMMC that are asleep */ mmc_go_idle(host); /* The extra bit indicates that we support high capacity */ err = mmc_send_op_cond(host, ocr | (1 << 30), &rocr); if (err) goto err; /* * For SPI, enable CRC as appropriate. */ if (mmc_host_is_spi(host)) { err = mmc_spi_set_crc(host, use_spi_crc); if (err) goto err; } /* * Fetch CID from card. */ if (mmc_host_is_spi(host)) err = mmc_send_cid(host, cid); else err = mmc_all_send_cid(host, cid); if (err) goto err; if (oldcard) { if (memcmp(cid, oldcard->raw_cid, sizeof(cid)) != 0) { err = -ENOENT; goto err; } card = oldcard; } else { /* * Allocate card structure. */ card = mmc_alloc_card(host, &mmc_type); if (IS_ERR(card)) { err = PTR_ERR(card); goto err; } card->type = MMC_TYPE_MMC; card->rca = 1; memcpy(card->raw_cid, cid, sizeof(card->raw_cid)); } /* * For native busses: set card RCA and quit open drain mode. */ if (!mmc_host_is_spi(host)) { err = mmc_set_relative_addr(card); if (err) goto free_card; mmc_set_bus_mode(host, MMC_BUSMODE_PUSHPULL); } if (!oldcard) { /* * Fetch CSD from card. */ err = mmc_send_csd(card, card->raw_csd); if (err) goto free_card; err = mmc_decode_csd(card); if (err) goto free_card; err = mmc_decode_cid(card); if (err) goto free_card; } /* * Select card, as all following commands rely on that. */ if (!mmc_host_is_spi(host)) { err = mmc_select_card(card); if (err) goto free_card; } if (!oldcard) { /* * Fetch and process extended CSD. */ err = mmc_get_ext_csd(card, &ext_csd); if (err) goto free_card; err = mmc_read_ext_csd(card, ext_csd); if (err) goto free_card; /* If doing byte addressing, check if required to do sector * addressing. Handle the case of <2GB cards needing sector * addressing. See section 8.1 JEDEC Standard JED84-A441; * ocr register has bit 30 set for sector addressing. */ if (!(mmc_card_blockaddr(card)) && (rocr & (1<<30))) mmc_card_set_blockaddr(card); /* Erase size depends on CSD and Extended CSD */ mmc_set_erase_size(card); } /* * If enhanced_area_en is TRUE, host needs to enable ERASE_GRP_DEF * bit. This bit will be lost every time after a reset or power off. */ if (card->ext_csd.enhanced_area_en || (card->ext_csd.rev >= 3 && (host->caps2 & MMC_CAP2_HC_ERASE_SZ))) { err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL, EXT_CSD_ERASE_GROUP_DEF, 1, card->ext_csd.generic_cmd6_time); if (err && err != -EBADMSG) goto free_card; if (err) { err = 0; /* * Just disable enhanced area off & sz * will try to enable ERASE_GROUP_DEF * during next time reinit */ card->ext_csd.enhanced_area_offset = -EINVAL; card->ext_csd.enhanced_area_size = -EINVAL; } else { card->ext_csd.erase_group_def = 1; /* * enable ERASE_GRP_DEF successfully. * This will affect the erase size, so * here need to reset erase size */ mmc_set_erase_size(card); } } /* * Ensure eMMC user default partition is enabled */ if (card->ext_csd.part_config & EXT_CSD_PART_CONFIG_ACC_MASK) { card->ext_csd.part_config &= ~EXT_CSD_PART_CONFIG_ACC_MASK; err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL, EXT_CSD_PART_CONFIG, card->ext_csd.part_config, card->ext_csd.part_time); if (err && err != -EBADMSG) goto free_card; } /* * If the host supports the power_off_notify capability then * set the notification byte in the ext_csd register of device */ if ((host->caps2 & MMC_CAP2_POWEROFF_NOTIFY) && (card->ext_csd.rev >= 6)) { err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL, EXT_CSD_POWER_OFF_NOTIFICATION, EXT_CSD_POWER_ON, card->ext_csd.generic_cmd6_time); if (err && err != -EBADMSG) goto free_card; /* * The err can be -EBADMSG or 0, * so check for success and update the flag */ if (!err) card->poweroff_notify_state = MMC_POWERED_ON; } /* * Activate high speed (if supported) */ if (card->ext_csd.hs_max_dtr != 0) { err = 0; if (card->ext_csd.hs_max_dtr > 52000000 && host->caps2 & MMC_CAP2_HS200) err = mmc_select_hs200(card); else if (host->caps & MMC_CAP_MMC_HIGHSPEED) err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL, EXT_CSD_HS_TIMING, 1, card->ext_csd.generic_cmd6_time); if (err && err != -EBADMSG) goto free_card; if (err) { pr_warning("%s: switch to highspeed failed\n", mmc_hostname(card->host)); err = 0; } else { if (card->ext_csd.hs_max_dtr > 52000000 && host->caps2 & MMC_CAP2_HS200) { mmc_card_set_hs200(card); mmc_set_timing(card->host, MMC_TIMING_MMC_HS200); } else { mmc_card_set_highspeed(card); mmc_set_timing(card->host, MMC_TIMING_MMC_HS); } } } /* * Compute bus speed. */ max_dtr = (unsigned int)-1; if (mmc_card_highspeed(card) || mmc_card_hs200(card)) { if (max_dtr > card->ext_csd.hs_max_dtr) max_dtr = card->ext_csd.hs_max_dtr; } else if (max_dtr > card->csd.max_dtr) { max_dtr = card->csd.max_dtr; } mmc_set_clock(host, max_dtr); /* * Indicate DDR mode (if supported). */ if (mmc_card_highspeed(card)) { if ((card->ext_csd.card_type & EXT_CSD_CARD_TYPE_DDR_1_8V) && ((host->caps & (MMC_CAP_1_8V_DDR | MMC_CAP_UHS_DDR50)) == (MMC_CAP_1_8V_DDR | MMC_CAP_UHS_DDR50))) ddr = MMC_1_8V_DDR_MODE; else if ((card->ext_csd.card_type & EXT_CSD_CARD_TYPE_DDR_1_2V) && ((host->caps & (MMC_CAP_1_2V_DDR | MMC_CAP_UHS_DDR50)) == (MMC_CAP_1_2V_DDR | MMC_CAP_UHS_DDR50))) ddr = MMC_1_2V_DDR_MODE; } /* * Indicate HS200 SDR mode (if supported). */ if (mmc_card_hs200(card)) { u32 ext_csd_bits; u32 bus_width = card->host->ios.bus_width; /* * For devices supporting HS200 mode, the bus width has * to be set before executing the tuning function. If * set before tuning, then device will respond with CRC * errors for responses on CMD line. So for HS200 the * sequence will be * 1. set bus width 4bit / 8 bit (1 bit not supported) * 2. switch to HS200 mode * 3. set the clock to > 52Mhz <=200MHz and * 4. execute tuning for HS200 */ if ((host->caps2 & MMC_CAP2_HS200) && card->host->ops->execute_tuning) { mmc_host_clk_hold(card->host); err = card->host->ops->execute_tuning(card->host, MMC_SEND_TUNING_BLOCK_HS200); mmc_host_clk_release(card->host); } if (err) { pr_warning("%s: tuning execution failed\n", mmc_hostname(card->host)); goto err; } ext_csd_bits = (bus_width == MMC_BUS_WIDTH_8) ? EXT_CSD_BUS_WIDTH_8 : EXT_CSD_BUS_WIDTH_4; err = mmc_select_powerclass(card, ext_csd_bits, ext_csd); if (err) pr_warning("%s: power class selection to bus width %d" " failed\n", mmc_hostname(card->host), 1 << bus_width); } /* * Activate wide bus and DDR (if supported). */ if (!mmc_card_hs200(card) && (card->csd.mmca_vsn >= CSD_SPEC_VER_4) && (host->caps & (MMC_CAP_4_BIT_DATA | MMC_CAP_8_BIT_DATA))) { static unsigned ext_csd_bits[][2] = { { EXT_CSD_BUS_WIDTH_8, EXT_CSD_DDR_BUS_WIDTH_8 }, { EXT_CSD_BUS_WIDTH_4, EXT_CSD_DDR_BUS_WIDTH_4 }, { EXT_CSD_BUS_WIDTH_1, EXT_CSD_BUS_WIDTH_1 }, }; static unsigned bus_widths[] = { MMC_BUS_WIDTH_8, MMC_BUS_WIDTH_4, MMC_BUS_WIDTH_1 }; unsigned idx, bus_width = 0; if (host->caps & MMC_CAP_8_BIT_DATA) idx = 0; else idx = 1; for (; idx < ARRAY_SIZE(bus_widths); idx++) { bus_width = bus_widths[idx]; if (bus_width == MMC_BUS_WIDTH_1) ddr = 0; /* no DDR for 1-bit width */ err = mmc_select_powerclass(card, ext_csd_bits[idx][0], ext_csd); if (err) pr_warning("%s: power class selection to " "bus width %d failed\n", mmc_hostname(card->host), 1 << bus_width); err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL, EXT_CSD_BUS_WIDTH, ext_csd_bits[idx][0], card->ext_csd.generic_cmd6_time); if (!err) { mmc_set_bus_width(card->host, bus_width); /* * If controller can't handle bus width test, * compare ext_csd previously read in 1 bit mode * against ext_csd at new bus width */ if (!(host->caps & MMC_CAP_BUS_WIDTH_TEST)) err = mmc_compare_ext_csds(card, bus_width); else err = mmc_bus_test(card, bus_width); if (!err) break; } } if (!err && ddr) { err = mmc_select_powerclass(card, ext_csd_bits[idx][1], ext_csd); if (err) pr_warning("%s: power class selection to " "bus width %d ddr %d failed\n", mmc_hostname(card->host), 1 << bus_width, ddr); err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL, EXT_CSD_BUS_WIDTH, ext_csd_bits[idx][1], card->ext_csd.generic_cmd6_time); } if (err) { pr_warning("%s: switch to bus width %d ddr %d " "failed\n", mmc_hostname(card->host), 1 << bus_width, ddr); goto free_card; } else if (ddr) { /* * eMMC cards can support 3.3V to 1.2V i/o (vccq) * signaling. * * EXT_CSD_CARD_TYPE_DDR_1_8V means 3.3V or 1.8V vccq. * * 1.8V vccq at 3.3V core voltage (vcc) is not required * in the JEDEC spec for DDR. * * Do not force change in vccq since we are obviously * working and no change to vccq is needed. * * WARNING: eMMC rules are NOT the same as SD DDR */ if (ddr == MMC_1_2V_DDR_MODE) { err = mmc_set_signal_voltage(host, MMC_SIGNAL_VOLTAGE_120, 0); if (err) goto err; } mmc_card_set_ddr_mode(card); mmc_set_timing(card->host, MMC_TIMING_UHS_DDR50); mmc_set_bus_width(card->host, bus_width); } } /* * Enable HPI feature (if supported) */ if (card->ext_csd.hpi) { err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL, EXT_CSD_HPI_MGMT, 1, card->ext_csd.generic_cmd6_time); if (err && err != -EBADMSG) goto free_card; if (err) { pr_warning("%s: Enabling HPI failed\n", mmc_hostname(card->host)); err = 0; } else card->ext_csd.hpi_en = 1; } /* * If cache size is higher than 0, this indicates * the existence of cache and it can be turned on. */ if ((host->caps2 & MMC_CAP2_CACHE_CTRL) && card->ext_csd.cache_size > 0) { err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL, EXT_CSD_CACHE_CTRL, 1, card->ext_csd.generic_cmd6_time); if (err && err != -EBADMSG) goto free_card; /* * Only if no error, cache is turned on successfully. */ if (err) { pr_warning("%s: Cache is supported, " "but failed to turn on (%d)\n", mmc_hostname(card->host), err); card->ext_csd.cache_ctrl = 0; err = 0; } else { card->ext_csd.cache_ctrl = 1; } } if (!oldcard) host->card = card; mmc_free_ext_csd(ext_csd); return 0; free_card: if (!oldcard) mmc_remove_card(card); err: mmc_free_ext_csd(ext_csd); return err; } /* * Host is being removed. Free up the current card. */ static void mmc_remove(struct mmc_host *host) { BUG_ON(!host); BUG_ON(!host->card); mmc_remove_card(host->card); host->card = NULL; } /* * Card detection - card is alive. */ static int mmc_alive(struct mmc_host *host) { return mmc_send_status(host->card, NULL); } /* * Card detection callback from host. */ static void mmc_detect(struct mmc_host *host) { int err; BUG_ON(!host); BUG_ON(!host->card); mmc_claim_host(host); /* * Just check if our card has been removed. */ err = _mmc_detect_card_removed(host); mmc_release_host(host); if (err) { mmc_remove(host); mmc_claim_host(host); mmc_detach_bus(host); mmc_power_off(host); mmc_release_host(host); } } /* * Suspend callback from host. */ static int mmc_suspend(struct mmc_host *host) { int err = 0; BUG_ON(!host); BUG_ON(!host->card); mmc_claim_host(host); if (mmc_card_can_sleep(host)) { err = mmc_card_sleep(host); if (!err) mmc_card_set_sleep(host->card); } else if (!mmc_host_is_spi(host)) mmc_deselect_cards(host); host->card->state &= ~(MMC_STATE_HIGHSPEED | MMC_STATE_HIGHSPEED_200); mmc_release_host(host); return err; } /* * Resume callback from host. * * This function tries to determine if the same card is still present * and, if so, restore all state to it. */ static int mmc_resume(struct mmc_host *host) { int err; BUG_ON(!host); BUG_ON(!host->card); mmc_claim_host(host); if (mmc_card_is_sleep(host->card)) { err = mmc_card_awake(host); mmc_card_clr_sleep(host->card); } else err = mmc_init_card(host, host->ocr, host->card); mmc_release_host(host); return err; } static int mmc_power_restore(struct mmc_host *host) { int ret; host->card->state &= ~(MMC_STATE_HIGHSPEED | MMC_STATE_HIGHSPEED_200); mmc_card_clr_sleep(host->card); mmc_claim_host(host); ret = mmc_init_card(host, host->ocr, host->card); mmc_release_host(host); return ret; } static int mmc_sleep(struct mmc_host *host) { struct mmc_card *card = host->card; int err = -ENOSYS; if (card && card->ext_csd.rev >= 3) { err = mmc_card_sleepawake(host, 1); if (err < 0) pr_debug("%s: Error %d while putting card into sleep", mmc_hostname(host), err); } return err; } static int mmc_awake(struct mmc_host *host) { struct mmc_card *card = host->card; int err = -ENOSYS; if (card && card->ext_csd.rev >= 3) { err = mmc_card_sleepawake(host, 0); if (err < 0) pr_debug("%s: Error %d while awaking sleeping card", mmc_hostname(host), err); } return err; } static const struct mmc_bus_ops mmc_ops = { .awake = mmc_awake, .sleep = mmc_sleep, .remove = mmc_remove, .detect = mmc_detect, .suspend = NULL, .resume = NULL, .power_restore = mmc_power_restore, .alive = mmc_alive, }; static const struct mmc_bus_ops mmc_ops_unsafe = { .awake = mmc_awake, .sleep = mmc_sleep, .remove = mmc_remove, .detect = mmc_detect, .suspend = mmc_suspend, .resume = mmc_resume, .power_restore = mmc_power_restore, .alive = mmc_alive, }; static void mmc_attach_bus_ops(struct mmc_host *host) { const struct mmc_bus_ops *bus_ops; if (!mmc_card_is_removable(host)) bus_ops = &mmc_ops_unsafe; else bus_ops = &mmc_ops; mmc_attach_bus(host, bus_ops); } /* * Starting point for MMC card init. */ int mmc_attach_mmc(struct mmc_host *host) { int err; u32 ocr; BUG_ON(!host); WARN_ON(!host->claimed); /* Set correct bus mode for MMC before attempting attach */ if (!mmc_host_is_spi(host)) mmc_set_bus_mode(host, MMC_BUSMODE_OPENDRAIN); err = mmc_send_op_cond(host, 0, &ocr); if (err) return err; mmc_attach_bus_ops(host); if (host->ocr_avail_mmc) host->ocr_avail = host->ocr_avail_mmc; /* * We need to get OCR a different way for SPI. */ if (mmc_host_is_spi(host)) { err = mmc_spi_read_ocr(host, 1, &ocr); if (err) goto err; } /* * Sanity check the voltages that the card claims to * support. */ if (ocr & 0x7F) { pr_warning("%s: card claims to support voltages " "below the defined range. These will be ignored.\n", mmc_hostname(host)); ocr &= ~0x7F; } host->ocr = mmc_select_voltage(host, ocr); /* * Can we support the voltage of the card? */ if (!host->ocr) { err = -EINVAL; goto err; } /* * Detect and init the card. */ err = mmc_init_card(host, host->ocr, NULL); if (err) goto err; mmc_release_host(host); err = mmc_add_card(host->card); mmc_claim_host(host); if (err) goto remove_card; return 0; remove_card: mmc_release_host(host); mmc_remove_card(host->card); mmc_claim_host(host); host->card = NULL; err: mmc_detach_bus(host); pr_err("%s: error %d whilst initialising MMC card\n", mmc_hostname(host), err); return err; }