diff options
Diffstat (limited to 'ANDROID_3.4.5/drivers/mmc/core/mmc.c')
| -rw-r--r-- | ANDROID_3.4.5/drivers/mmc/core/mmc.c | 1537 |
1 files changed, 1537 insertions, 0 deletions
diff --git a/ANDROID_3.4.5/drivers/mmc/core/mmc.c b/ANDROID_3.4.5/drivers/mmc/core/mmc.c new file mode 100644 index 00000000..54df5adc --- /dev/null +++ b/ANDROID_3.4.5/drivers/mmc/core/mmc.c @@ -0,0 +1,1537 @@ +/* + * 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 <linux/err.h> +#include <linux/slab.h> +#include <linux/stat.h> + +#include <linux/mmc/host.h> +#include <linux/mmc/card.h> +#include <linux/mmc/mmc.h> + +#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]; + 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. + */ + card->ext_csd.raw_partition_support = ext_csd[EXT_CSD_PARTITION_SUPPORT]; + 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; +} |