diff options
Diffstat (limited to 'drivers/mmc/core/mmc.c')
| -rw-r--r-- | drivers/mmc/core/mmc.c | 2141 |
1 files changed, 1437 insertions, 704 deletions
diff --git a/drivers/mmc/core/mmc.c b/drivers/mmc/core/mmc.c index 6d02012a1d0b..7c86efb1044a 100644 --- a/drivers/mmc/core/mmc.c +++ b/drivers/mmc/core/mmc.c @@ -1,27 +1,44 @@ +// SPDX-License-Identifier: GPL-2.0-only /* * 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/of.h> #include <linux/slab.h> #include <linux/stat.h> +#include <linux/string.h> +#include <linux/pm_runtime.h> +#include <linux/random.h> +#include <linux/sysfs.h> #include <linux/mmc/host.h> #include <linux/mmc/card.h> #include <linux/mmc/mmc.h> #include "core.h" +#include "card.h" +#include "host.h" #include "bus.h" #include "mmc_ops.h" +#include "quirks.h" #include "sd_ops.h" +#include "pwrseq.h" + +#define DEFAULT_CMD6_TIMEOUT_MS 500 +#define MIN_CACHE_EN_TIMEOUT_MS 1600 +#define CACHE_FLUSH_TIMEOUT_MS 30000 /* 30s */ + +enum mmc_poweroff_type { + MMC_POWEROFF_SUSPEND, + MMC_POWEROFF_SHUTDOWN, + MMC_POWEROFF_UNDERVOLTAGE, + MMC_POWEROFF_UNBIND, +}; static const unsigned int tran_exp[] = { 10000, 100000, 1000000, 10000000, @@ -33,29 +50,15 @@ static const unsigned char tran_mant[] = { 35, 40, 45, 50, 55, 60, 70, 80, }; -static const unsigned int tacc_exp[] = { +static const unsigned int taac_exp[] = { 1, 10, 100, 1000, 10000, 100000, 1000000, 10000000, }; -static const unsigned int tacc_mant[] = { +static const unsigned int taac_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. */ @@ -64,42 +67,48 @@ static int mmc_decode_cid(struct mmc_card *card) u32 *resp = card->raw_cid; /* + * Add the raw card ID (cid) data to the entropy pool. It doesn't + * matter that not all of it is unique, it's just bonus entropy. + */ + add_device_randomness(&card->raw_cid, sizeof(card->raw_cid)); + + /* * The selection of the format here is based upon published - * specs from sandisk and from what people have reported. + * 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; + 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.prv = UNSTUFF_BITS(resp, 48, 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; + 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.prv = unstuff_bits(resp, 48, 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: @@ -108,6 +117,9 @@ static int mmc_decode_cid(struct mmc_card *card) return -EINVAL; } + /* some product names include trailing whitespace */ + strim(card->cid.prod_name); + return 0; } @@ -121,6 +133,17 @@ static void mmc_set_erase_size(struct mmc_card *card) mmc_init_erase(card); } + +static void mmc_set_wp_grp_size(struct mmc_card *card) +{ + if (card->ext_csd.erase_group_def & 1) + card->wp_grp_size = card->ext_csd.hc_erase_size * + card->ext_csd.raw_hc_erase_gap_size; + else + card->wp_grp_size = card->csd.erase_size * + (card->csd.wp_grp_size + 1); +} + /* * Given a 128-bit response, decode to our card CSD structure. */ @@ -135,150 +158,230 @@ static int mmc_decode_csd(struct mmc_card *card) * 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); + 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; + csd->mmca_vsn = unstuff_bits(resp, 122, 4); + m = unstuff_bits(resp, 115, 4); + e = unstuff_bits(resp, 112, 3); + csd->taac_ns = (taac_exp[e] * taac_mant[m] + 9) / 10; + csd->taac_clks = unstuff_bits(resp, 104, 8) * 100; - m = UNSTUFF_BITS(resp, 99, 4); - e = UNSTUFF_BITS(resp, 96, 3); + 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); + csd->cmdclass = unstuff_bits(resp, 84, 12); - e = UNSTUFF_BITS(resp, 47, 3); - m = UNSTUFF_BITS(resp, 62, 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); + 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->dsr_imp = unstuff_bits(resp, 76, 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); + 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; + csd->wp_grp_size = unstuff_bits(resp, 32, 5); } return 0; } -/* - * Read extended CSD. - */ -static int mmc_get_ext_csd(struct mmc_card *card, u8 **new_ext_csd) +static void mmc_select_card_type(struct mmc_card *card) { - int err; - u8 *ext_csd; + struct mmc_host *host = card->host; + u8 card_type = card->ext_csd.raw_card_type; + u32 caps = host->caps, caps2 = host->caps2; + unsigned int hs_max_dtr = 0, hs200_max_dtr = 0; + unsigned int avail_type = 0; - BUG_ON(!card); - BUG_ON(!new_ext_csd); + if (caps & MMC_CAP_MMC_HIGHSPEED && + card_type & EXT_CSD_CARD_TYPE_HS_26) { + hs_max_dtr = MMC_HIGH_26_MAX_DTR; + avail_type |= EXT_CSD_CARD_TYPE_HS_26; + } - *new_ext_csd = NULL; + if (caps & MMC_CAP_MMC_HIGHSPEED && + card_type & EXT_CSD_CARD_TYPE_HS_52) { + hs_max_dtr = MMC_HIGH_52_MAX_DTR; + avail_type |= EXT_CSD_CARD_TYPE_HS_52; + } - if (card->csd.mmca_vsn < CSD_SPEC_VER_4) - return 0; + if (caps & (MMC_CAP_1_8V_DDR | MMC_CAP_3_3V_DDR) && + card_type & EXT_CSD_CARD_TYPE_DDR_1_8V) { + hs_max_dtr = MMC_HIGH_DDR_MAX_DTR; + avail_type |= EXT_CSD_CARD_TYPE_DDR_1_8V; + } - /* - * 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; + if (caps & MMC_CAP_1_2V_DDR && + card_type & EXT_CSD_CARD_TYPE_DDR_1_2V) { + hs_max_dtr = MMC_HIGH_DDR_MAX_DTR; + avail_type |= EXT_CSD_CARD_TYPE_DDR_1_2V; } - err = mmc_send_ext_csd(card, ext_csd); - if (err) { - kfree(ext_csd); - *new_ext_csd = NULL; + if (caps2 & MMC_CAP2_HS200_1_8V_SDR && + card_type & EXT_CSD_CARD_TYPE_HS200_1_8V) { + hs200_max_dtr = MMC_HS200_MAX_DTR; + avail_type |= EXT_CSD_CARD_TYPE_HS200_1_8V; + } - /* If the host or the card can't do the switch, - * fail more gracefully. */ - if ((err != -EINVAL) - && (err != -ENOSYS) - && (err != -EFAULT)) - return err; + if (caps2 & MMC_CAP2_HS200_1_2V_SDR && + card_type & EXT_CSD_CARD_TYPE_HS200_1_2V) { + hs200_max_dtr = MMC_HS200_MAX_DTR; + avail_type |= EXT_CSD_CARD_TYPE_HS200_1_2V; + } - /* - * 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; + if (caps2 & MMC_CAP2_HS400_1_8V && + card_type & EXT_CSD_CARD_TYPE_HS400_1_8V) { + hs200_max_dtr = MMC_HS200_MAX_DTR; + avail_type |= EXT_CSD_CARD_TYPE_HS400_1_8V; + } - return err; + if (caps2 & MMC_CAP2_HS400_1_2V && + card_type & EXT_CSD_CARD_TYPE_HS400_1_2V) { + hs200_max_dtr = MMC_HS200_MAX_DTR; + avail_type |= EXT_CSD_CARD_TYPE_HS400_1_2V; + } + + if ((caps2 & MMC_CAP2_HS400_ES) && + card->ext_csd.strobe_support && + (avail_type & EXT_CSD_CARD_TYPE_HS400)) + avail_type |= EXT_CSD_CARD_TYPE_HS400ES; + + card->ext_csd.hs_max_dtr = hs_max_dtr; + card->ext_csd.hs200_max_dtr = hs200_max_dtr; + card->mmc_avail_type = avail_type; } -static void mmc_select_card_type(struct mmc_card *card) +static void mmc_manage_enhanced_area(struct mmc_card *card, u8 *ext_csd) { - struct mmc_host *host = card->host; - u8 card_type = card->ext_csd.raw_card_type & EXT_CSD_CARD_TYPE_MASK; - u32 caps = host->caps, caps2 = host->caps2; - unsigned int hs_max_dtr = 0; + u8 hc_erase_grp_sz, hc_wp_grp_sz; - if (card_type & EXT_CSD_CARD_TYPE_26) - hs_max_dtr = MMC_HIGH_26_MAX_DTR; + /* + * Disable these attributes by default + */ + card->ext_csd.enhanced_area_offset = -EINVAL; + card->ext_csd.enhanced_area_size = -EINVAL; - if (caps & MMC_CAP_MMC_HIGHSPEED && - card_type & EXT_CSD_CARD_TYPE_52) - hs_max_dtr = MMC_HIGH_52_MAX_DTR; + /* + * 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)) { + if (card->ext_csd.partition_setting_completed) { + hc_erase_grp_sz = + ext_csd[EXT_CSD_HC_ERASE_GRP_SIZE]; + hc_wp_grp_sz = + ext_csd[EXT_CSD_HC_WP_GRP_SIZE]; - if ((caps & MMC_CAP_1_8V_DDR && - card_type & EXT_CSD_CARD_TYPE_DDR_1_8V) || - (caps & MMC_CAP_1_2V_DDR && - card_type & EXT_CSD_CARD_TYPE_DDR_1_2V)) - hs_max_dtr = MMC_HIGH_DDR_MAX_DTR; + /* + * calculate the enhanced data area offset, in bytes + */ + card->ext_csd.enhanced_area_offset = + (((unsigned long long)ext_csd[139]) << 24) + + (((unsigned long long)ext_csd[138]) << 16) + + (((unsigned long long)ext_csd[137]) << 8) + + (((unsigned long long)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 { + pr_warn("%s: defines enhanced area without partition setting complete\n", + mmc_hostname(card->host)); + } + } +} + +static void mmc_part_add(struct mmc_card *card, u64 size, + unsigned int part_cfg, char *name, int idx, bool ro, + int area_type) +{ + card->part[card->nr_parts].size = size; + card->part[card->nr_parts].part_cfg = part_cfg; + sprintf(card->part[card->nr_parts].name, name, idx); + card->part[card->nr_parts].force_ro = ro; + card->part[card->nr_parts].area_type = area_type; + card->nr_parts++; +} - if ((caps2 & MMC_CAP2_HS200_1_8V_SDR && - card_type & EXT_CSD_CARD_TYPE_SDR_1_8V) || - (caps2 & MMC_CAP2_HS200_1_2V_SDR && - card_type & EXT_CSD_CARD_TYPE_SDR_1_2V)) - hs_max_dtr = MMC_HS200_MAX_DTR; +static void mmc_manage_gp_partitions(struct mmc_card *card, u8 *ext_csd) +{ + int idx; + u8 hc_erase_grp_sz, hc_wp_grp_sz; + u64 part_size; - card->ext_csd.hs_max_dtr = hs_max_dtr; - card->ext_csd.card_type = card_type; + /* + * 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) { + hc_erase_grp_sz = + ext_csd[EXT_CSD_HC_ERASE_GRP_SIZE]; + hc_wp_grp_sz = + ext_csd[EXT_CSD_HC_WP_GRP_SIZE]; + + 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; + if (card->ext_csd.partition_setting_completed == 0) { + pr_warn("%s: has partition size defined without partition complete\n", + mmc_hostname(card->host)); + break; + } + 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 *= (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); + } + } } +/* Minimum partition switch timeout in milliseconds */ +#define MMC_MIN_PART_SWITCH_TIME 300 + /* * Decode extended CSD. */ -static int mmc_read_ext_csd(struct mmc_card *card, u8 *ext_csd) +static int mmc_decode_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; + u64 part_size; + struct device_node *np; + bool broken_hpi = false; /* 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]; @@ -292,13 +395,20 @@ static int mmc_read_ext_csd(struct mmc_card *card, u8 *ext_csd) } } + np = mmc_of_find_child_device(card->host, 0); + if (np && of_device_is_compatible(np, "mmc-card")) + broken_hpi = of_property_read_bool(np, "broken-hpi"); + of_node_put(np); + + /* + * The EXT_CSD format is meant to be forward compatible. As long + * as CSD_STRUCTURE does not change, all values for EXT_CSD_REV + * are authorized, see JEDEC JESD84-B50 section B.8. + */ card->ext_csd.rev = ext_csd[EXT_CSD_REV]; - if (card->ext_csd.rev > 7) { - pr_err("%s: unrecognised EXT_CSD revision %d\n", - mmc_hostname(card->host), card->ext_csd.rev); - err = -EINVAL; - goto out; - } + + /* fixup device after ext_csd revision field is updated */ + mmc_fixup_device(card, mmc_ext_csd_fixups); 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]; @@ -316,14 +426,16 @@ static int mmc_read_ext_csd(struct mmc_card *card, u8 *ext_csd) mmc_card_set_blockaddr(card); } + card->ext_csd.strobe_support = ext_csd[EXT_CSD_STROBE_SUPPORT]; card->ext_csd.raw_card_type = ext_csd[EXT_CSD_CARD_TYPE]; - mmc_select_card_type(card); 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]; + card->ext_csd.raw_boot_mult = + ext_csd[EXT_CSD_BOOT_MULT]; 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]; @@ -348,7 +460,7 @@ static int mmc_read_ext_csd(struct mmc_card *card, u8 *ext_csd) * 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)) { + if (ext_csd[EXT_CSD_BOOT_MULT] && mmc_host_can_access_boot(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, @@ -370,81 +482,18 @@ static int mmc_read_ext_csd(struct mmc_card *card, u8 *ext_csd) card->ext_csd.raw_trim_mult = ext_csd[EXT_CSD_TRIM_MULT]; card->ext_csd.raw_partition_support = ext_csd[EXT_CSD_PARTITION_SUPPORT]; + card->ext_csd.raw_driver_strength = ext_csd[EXT_CSD_DRIVER_STRENGTH]; 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]; + if (ext_csd[EXT_CSD_PARTITION_SETTING_COMPLETED] & + EXT_CSD_PART_SETTING_COMPLETED) + card->ext_csd.partition_setting_completed = 1; + else + card->ext_csd.partition_setting_completed = 0; - 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; - } + mmc_manage_enhanced_area(card, ext_csd); - /* - * 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; - } + mmc_manage_gp_partitions(card, ext_csd); - 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 = @@ -479,6 +528,8 @@ static int mmc_read_ext_csd(struct mmc_card *card, u8 *ext_csd) ext_csd[EXT_CSD_PWR_CL_DDR_52_195]; card->ext_csd.raw_pwr_cl_ddr_52_360 = ext_csd[EXT_CSD_PWR_CL_DDR_52_360]; + card->ext_csd.raw_pwr_cl_ddr_200_360 = + ext_csd[EXT_CSD_PWR_CL_DDR_200_360]; } if (card->ext_csd.rev >= 5) { @@ -489,16 +540,25 @@ static int mmc_read_ext_csd(struct mmc_card *card, u8 *ext_csd) /* check whether the eMMC card supports BKOPS */ if (ext_csd[EXT_CSD_BKOPS_SUPPORT] & 0x1) { card->ext_csd.bkops = 1; - card->ext_csd.bkops_en = ext_csd[EXT_CSD_BKOPS_EN]; + card->ext_csd.man_bkops_en = + (ext_csd[EXT_CSD_BKOPS_EN] & + EXT_CSD_MANUAL_BKOPS_MASK); card->ext_csd.raw_bkops_status = ext_csd[EXT_CSD_BKOPS_STATUS]; - if (!card->ext_csd.bkops_en) - pr_info("%s: BKOPS_EN bit is not set\n", + if (card->ext_csd.man_bkops_en) + pr_debug("%s: MAN_BKOPS_EN bit is set\n", + mmc_hostname(card->host)); + card->ext_csd.auto_bkops_en = + (ext_csd[EXT_CSD_BKOPS_EN] & + EXT_CSD_AUTO_BKOPS_MASK); + if (card->ext_csd.auto_bkops_en) + pr_debug("%s: AUTO_BKOPS_EN bit is set\n", mmc_hostname(card->host)); } /* check whether the eMMC card supports HPI */ - if (ext_csd[EXT_CSD_HPI_FEATURES] & 0x1) { + if (!mmc_card_broken_hpi(card) && + !broken_hpi && (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; @@ -519,7 +579,7 @@ static int mmc_read_ext_csd(struct mmc_card *card, u8 *ext_csd) * RPMB regions are defined in multiples of 128K. */ card->ext_csd.raw_rpmb_size_mult = ext_csd[EXT_CSD_RPMB_MULT]; - if (ext_csd[EXT_CSD_RPMB_MULT] && mmc_host_cmd23(card->host)) { + if (ext_csd[EXT_CSD_RPMB_MULT] && mmc_host_can_cmd23(card->host)) { mmc_part_add(card, ext_csd[EXT_CSD_RPMB_MULT] << 17, EXT_CSD_PART_CONFIG_ACC_RPMB, "rpmb", 0, false, @@ -534,6 +594,7 @@ static int mmc_read_ext_csd(struct mmc_card *card, u8 *ext_csd) card->erased_byte = 0x0; /* eMMC v4.5 or later */ + card->ext_csd.generic_cmd6_time = DEFAULT_CMD6_TIMEOUT_MS; if (card->ext_csd.rev >= 6) { card->ext_csd.feature_support |= MMC_DISCARD_FEATURE; @@ -561,25 +622,98 @@ static int mmc_read_ext_csd(struct mmc_card *card, u8 *ext_csd) } else { card->ext_csd.data_tag_unit_size = 0; } - - card->ext_csd.max_packed_writes = - ext_csd[EXT_CSD_MAX_PACKED_WRITES]; - card->ext_csd.max_packed_reads = - ext_csd[EXT_CSD_MAX_PACKED_READS]; } else { card->ext_csd.data_sector_size = 512; } + /* + * GENERIC_CMD6_TIME is to be used "unless a specific timeout is defined + * when accessing a specific field", so use it here if there is no + * PARTITION_SWITCH_TIME. + */ + if (!card->ext_csd.part_time) + card->ext_csd.part_time = card->ext_csd.generic_cmd6_time; + /* Some eMMC set the value too low so set a minimum */ + if (card->ext_csd.part_time < MMC_MIN_PART_SWITCH_TIME) + card->ext_csd.part_time = MMC_MIN_PART_SWITCH_TIME; + + /* eMMC v5 or later */ + if (card->ext_csd.rev >= 7) { + memcpy(card->ext_csd.fwrev, &ext_csd[EXT_CSD_FIRMWARE_VERSION], + MMC_FIRMWARE_LEN); + card->ext_csd.ffu_capable = + (ext_csd[EXT_CSD_SUPPORTED_MODE] & 0x1) && + !(ext_csd[EXT_CSD_FW_CONFIG] & 0x1); + + card->ext_csd.pre_eol_info = ext_csd[EXT_CSD_PRE_EOL_INFO]; + card->ext_csd.device_life_time_est_typ_a = + ext_csd[EXT_CSD_DEVICE_LIFE_TIME_EST_TYP_A]; + card->ext_csd.device_life_time_est_typ_b = + ext_csd[EXT_CSD_DEVICE_LIFE_TIME_EST_TYP_B]; + } + + /* eMMC v5.1 or later */ + if (card->ext_csd.rev >= 8) { + card->ext_csd.cmdq_support = ext_csd[EXT_CSD_CMDQ_SUPPORT] & + EXT_CSD_CMDQ_SUPPORTED; + card->ext_csd.cmdq_depth = (ext_csd[EXT_CSD_CMDQ_DEPTH] & + EXT_CSD_CMDQ_DEPTH_MASK) + 1; + /* Exclude inefficiently small queue depths */ + if (card->ext_csd.cmdq_depth <= 2) { + card->ext_csd.cmdq_support = false; + card->ext_csd.cmdq_depth = 0; + } + if (card->ext_csd.cmdq_support) { + pr_debug("%s: Command Queue supported depth %u\n", + mmc_hostname(card->host), + card->ext_csd.cmdq_depth); + } + card->ext_csd.enhanced_rpmb_supported = + (card->ext_csd.rel_param & + EXT_CSD_WR_REL_PARAM_EN_RPMB_REL_WR); + } out: return err; } -static inline void mmc_free_ext_csd(u8 *ext_csd) +static int mmc_read_ext_csd(struct mmc_card *card) { + u8 *ext_csd; + int err; + + if (!mmc_card_can_ext_csd(card)) + return 0; + + err = mmc_get_ext_csd(card, &ext_csd); + if (err) { + /* 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_warn("%s: unable to read EXT_CSD, performance might suffer\n", + mmc_hostname(card->host)); + err = 0; + } + + return err; + } + + err = mmc_decode_ext_csd(card, ext_csd); kfree(ext_csd); + return err; } - static int mmc_compare_ext_csds(struct mmc_card *card, unsigned bus_width) { u8 *bw_ext_csd; @@ -589,11 +723,8 @@ static int mmc_compare_ext_csds(struct mmc_card *card, unsigned bus_width) return 0; err = mmc_get_ext_csd(card, &bw_ext_csd); - - if (err || bw_ext_csd == NULL) { - err = -EINVAL; - goto out; - } + if (err) + return err; /* only compare read only fields */ err = !((card->ext_csd.raw_partition_support == @@ -645,12 +776,14 @@ static int mmc_compare_ext_csds(struct mmc_card *card, unsigned bus_width) (card->ext_csd.raw_pwr_cl_ddr_52_195 == bw_ext_csd[EXT_CSD_PWR_CL_DDR_52_195]) && (card->ext_csd.raw_pwr_cl_ddr_52_360 == - bw_ext_csd[EXT_CSD_PWR_CL_DDR_52_360])); + bw_ext_csd[EXT_CSD_PWR_CL_DDR_52_360]) && + (card->ext_csd.raw_pwr_cl_ddr_200_360 == + bw_ext_csd[EXT_CSD_PWR_CL_DDR_200_360])); + if (err) err = -EINVAL; -out: - mmc_free_ext_csd(bw_ext_csd); + kfree(bw_ext_csd); return err; } @@ -661,18 +794,60 @@ MMC_DEV_ATTR(csd, "%08x%08x%08x%08x\n", card->raw_csd[0], card->raw_csd[1], 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(wp_grp_size, "%u\n", card->wp_grp_size << 9); +MMC_DEV_ATTR(ffu_capable, "%d\n", card->ext_csd.ffu_capable); 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(prv, "0x%x\n", card->cid.prv); +MMC_DEV_ATTR(rev, "0x%x\n", card->ext_csd.rev); +MMC_DEV_ATTR(pre_eol_info, "0x%02x\n", card->ext_csd.pre_eol_info); +MMC_DEV_ATTR(life_time, "0x%02x 0x%02x\n", + card->ext_csd.device_life_time_est_typ_a, + card->ext_csd.device_life_time_est_typ_b); 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); MMC_DEV_ATTR(raw_rpmb_size_mult, "%#x\n", card->ext_csd.raw_rpmb_size_mult); +MMC_DEV_ATTR(enhanced_rpmb_supported, "%#x\n", + card->ext_csd.enhanced_rpmb_supported); MMC_DEV_ATTR(rel_sectors, "%#x\n", card->ext_csd.rel_sectors); +MMC_DEV_ATTR(ocr, "0x%08x\n", card->ocr); +MMC_DEV_ATTR(rca, "0x%04x\n", card->rca); +MMC_DEV_ATTR(cmdq_en, "%d\n", card->ext_csd.cmdq_en); + +static ssize_t mmc_fwrev_show(struct device *dev, + struct device_attribute *attr, + char *buf) +{ + struct mmc_card *card = mmc_dev_to_card(dev); + + if (card->ext_csd.rev < 7) + return sysfs_emit(buf, "0x%x\n", card->cid.fwrev); + else + return sysfs_emit(buf, "0x%*phN\n", MMC_FIRMWARE_LEN, + card->ext_csd.fwrev); +} + +static DEVICE_ATTR(fwrev, 0444, mmc_fwrev_show, NULL); + +static ssize_t mmc_dsr_show(struct device *dev, + struct device_attribute *attr, + char *buf) +{ + struct mmc_card *card = mmc_dev_to_card(dev); + struct mmc_host *host = card->host; + + if (card->csd.dsr_imp && host->dsr_req) + return sysfs_emit(buf, "0x%x\n", host->dsr); + else + /* return default DSR value */ + return sysfs_emit(buf, "0x%x\n", 0x404); +} + +static DEVICE_ATTR(dsr, 0444, mmc_dsr_show, NULL); static struct attribute *mmc_std_attrs[] = { &dev_attr_cid.attr, @@ -680,31 +855,33 @@ static struct attribute *mmc_std_attrs[] = { &dev_attr_date.attr, &dev_attr_erase_size.attr, &dev_attr_preferred_erase_size.attr, + &dev_attr_wp_grp_size.attr, &dev_attr_fwrev.attr, + &dev_attr_ffu_capable.attr, &dev_attr_hwrev.attr, &dev_attr_manfid.attr, &dev_attr_name.attr, &dev_attr_oemid.attr, &dev_attr_prv.attr, + &dev_attr_rev.attr, + &dev_attr_pre_eol_info.attr, + &dev_attr_life_time.attr, &dev_attr_serial.attr, &dev_attr_enhanced_area_offset.attr, &dev_attr_enhanced_area_size.attr, &dev_attr_raw_rpmb_size_mult.attr, + &dev_attr_enhanced_rpmb_supported.attr, &dev_attr_rel_sectors.attr, + &dev_attr_ocr.attr, + &dev_attr_rca.attr, + &dev_attr_dsr.attr, + &dev_attr_cmdq_en.attr, NULL, }; +ATTRIBUTE_GROUPS(mmc_std); -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, +static const struct device_type mmc_type = { + .groups = mmc_std_groups, }; /* @@ -713,36 +890,24 @@ static struct device_type mmc_type = { * extended CSD register, select it by executing the * mmc_switch command. */ -static int mmc_select_powerclass(struct mmc_card *card, - unsigned int bus_width) +static int __mmc_select_powerclass(struct mmc_card *card, + unsigned int bus_width) { - int err = 0; + struct mmc_host *host = card->host; + struct mmc_ext_csd *ext_csd = &card->ext_csd; unsigned int pwrclass_val = 0; - struct mmc_host *host; - - BUG_ON(!card); - - host = card->host; - BUG_ON(!host); - - /* 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; + int err = 0; switch (1 << host->ios.vdd) { case MMC_VDD_165_195: - if (host->ios.clock <= 26000000) - pwrclass_val = card->ext_csd.raw_pwr_cl_26_195; - else if (host->ios.clock <= 52000000) + if (host->ios.clock <= MMC_HIGH_26_MAX_DTR) + pwrclass_val = ext_csd->raw_pwr_cl_26_195; + else if (host->ios.clock <= MMC_HIGH_52_MAX_DTR) pwrclass_val = (bus_width <= EXT_CSD_BUS_WIDTH_8) ? - card->ext_csd.raw_pwr_cl_52_195 : - card->ext_csd.raw_pwr_cl_ddr_52_195; - else if (host->ios.clock <= 200000000) - pwrclass_val = card->ext_csd.raw_pwr_cl_200_195; + ext_csd->raw_pwr_cl_52_195 : + ext_csd->raw_pwr_cl_ddr_52_195; + else if (host->ios.clock <= MMC_HS200_MAX_DTR) + pwrclass_val = ext_csd->raw_pwr_cl_200_195; break; case MMC_VDD_27_28: case MMC_VDD_28_29: @@ -753,18 +918,20 @@ static int mmc_select_powerclass(struct mmc_card *card, case MMC_VDD_33_34: case MMC_VDD_34_35: case MMC_VDD_35_36: - if (host->ios.clock <= 26000000) - pwrclass_val = card->ext_csd.raw_pwr_cl_26_360; - else if (host->ios.clock <= 52000000) + if (host->ios.clock <= MMC_HIGH_26_MAX_DTR) + pwrclass_val = ext_csd->raw_pwr_cl_26_360; + else if (host->ios.clock <= MMC_HIGH_52_MAX_DTR) pwrclass_val = (bus_width <= EXT_CSD_BUS_WIDTH_8) ? - card->ext_csd.raw_pwr_cl_52_360 : - card->ext_csd.raw_pwr_cl_ddr_52_360; - else if (host->ios.clock <= 200000000) - pwrclass_val = card->ext_csd.raw_pwr_cl_200_360; + ext_csd->raw_pwr_cl_52_360 : + ext_csd->raw_pwr_cl_ddr_52_360; + else if (host->ios.clock <= MMC_HS200_MAX_DTR) + pwrclass_val = (bus_width == EXT_CSD_DDR_BUS_WIDTH_8) ? + ext_csd->raw_pwr_cl_ddr_200_360 : + ext_csd->raw_pwr_cl_200_360; break; default: - pr_warning("%s: Voltage range not supported " - "for power class.\n", mmc_hostname(host)); + pr_warn("%s: Voltage range not supported for power class\n", + mmc_hostname(host)); return -EINVAL; } @@ -786,40 +953,81 @@ static int mmc_select_powerclass(struct mmc_card *card, return err; } +static int mmc_select_powerclass(struct mmc_card *card) +{ + struct mmc_host *host = card->host; + u32 bus_width, ext_csd_bits; + int err, ddr; + + /* Power class selection is supported for versions >= 4.0 */ + if (!mmc_card_can_ext_csd(card)) + return 0; + + bus_width = host->ios.bus_width; + /* Power class values are defined only for 4/8 bit bus */ + if (bus_width == MMC_BUS_WIDTH_1) + return 0; + + ddr = card->mmc_avail_type & EXT_CSD_CARD_TYPE_DDR_52; + if (ddr) + ext_csd_bits = (bus_width == MMC_BUS_WIDTH_8) ? + EXT_CSD_DDR_BUS_WIDTH_8 : EXT_CSD_DDR_BUS_WIDTH_4; + else + 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); + if (err) + pr_warn("%s: power class selection to bus width %d ddr %d failed\n", + mmc_hostname(host), 1 << bus_width, ddr); + + return err; +} + /* - * Selects the desired buswidth and switch to the HS200 mode - * if bus width set without error + * Set the bus speed for the selected speed mode. */ -static int mmc_select_hs200(struct mmc_card *card) +static void mmc_set_bus_speed(struct mmc_card *card) +{ + unsigned int max_dtr = (unsigned int)-1; + + if ((mmc_card_hs200(card) || mmc_card_hs400(card)) && + max_dtr > card->ext_csd.hs200_max_dtr) + max_dtr = card->ext_csd.hs200_max_dtr; + else if (mmc_card_hs(card) && 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(card->host, max_dtr); +} + +/* + * Select the bus width amoung 4-bit and 8-bit(SDR). + * If the bus width is changed successfully, return the selected width value. + * Zero is returned instead of error value if the wide width is not supported. + */ +static int mmc_select_bus_width(struct mmc_card *card) { - int idx, err = -EINVAL; - struct mmc_host *host; static unsigned ext_csd_bits[] = { - EXT_CSD_BUS_WIDTH_4, EXT_CSD_BUS_WIDTH_8, + EXT_CSD_BUS_WIDTH_4, + EXT_CSD_BUS_WIDTH_1, }; static unsigned bus_widths[] = { - MMC_BUS_WIDTH_4, MMC_BUS_WIDTH_8, + MMC_BUS_WIDTH_4, + MMC_BUS_WIDTH_1, }; + struct mmc_host *host = card->host; + unsigned idx, bus_width = 0; + int err = 0; - 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) - err = __mmc_set_signal_voltage(host, MMC_SIGNAL_VOLTAGE_120); - - if (err && card->ext_csd.card_type & EXT_CSD_CARD_TYPE_SDR_1_8V && - host->caps2 & MMC_CAP2_HS200_1_8V_SDR) - err = __mmc_set_signal_voltage(host, MMC_SIGNAL_VOLTAGE_180); - - /* If fails try again during next card power cycle */ - if (err) - goto err; + if (!mmc_card_can_ext_csd(card) || + !(host->caps & (MMC_CAP_4_BIT_DATA | MMC_CAP_8_BIT_DATA))) + return 0; - idx = (host->caps & MMC_CAP_8_BIT_DATA) ? 1 : 0; + idx = (host->caps & MMC_CAP_8_BIT_DATA) ? 0 : 1; /* * Unlike SD, MMC cards dont have a configuration register to notify @@ -827,8 +1035,7 @@ static int mmc_select_hs200(struct mmc_card *card) * 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--) { - + for (; idx < ARRAY_SIZE(bus_widths); idx++) { /* * Host is capable of 8bit transfer, then switch * the device to work in 8bit transfer mode. If the @@ -843,25 +1050,553 @@ static int mmc_select_hs200(struct mmc_card *card) if (err) continue; - mmc_set_bus_width(card->host, bus_widths[idx]); + bus_width = bus_widths[idx]; + mmc_set_bus_width(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_widths[idx]); + err = mmc_compare_ext_csds(card, bus_width); else - err = mmc_bus_test(card, bus_widths[idx]); - if (!err) + err = mmc_bus_test(card, bus_width); + + if (!err) { + err = bus_width; break; + } else { + pr_warn("%s: switch to bus width %d failed\n", + mmc_hostname(host), 1 << bus_width); + } } - /* 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); + return err; +} + +/* + * Switch to the high-speed mode + */ +static int mmc_select_hs(struct mmc_card *card) +{ + int err; + + err = __mmc_switch(card, EXT_CSD_CMD_SET_NORMAL, + EXT_CSD_HS_TIMING, EXT_CSD_TIMING_HS, + card->ext_csd.generic_cmd6_time, MMC_TIMING_MMC_HS, + true, true, MMC_CMD_RETRIES); + if (err) + pr_warn("%s: switch to high-speed failed, err:%d\n", + mmc_hostname(card->host), err); + + return err; +} + +/* + * Activate wide bus and DDR if supported. + */ +static int mmc_select_hs_ddr(struct mmc_card *card) +{ + struct mmc_host *host = card->host; + u32 bus_width, ext_csd_bits; + int err = 0; + + if (!(card->mmc_avail_type & EXT_CSD_CARD_TYPE_DDR_52)) + return 0; + + bus_width = host->ios.bus_width; + if (bus_width == MMC_BUS_WIDTH_1) + return 0; + + ext_csd_bits = (bus_width == MMC_BUS_WIDTH_8) ? + EXT_CSD_DDR_BUS_WIDTH_8 : EXT_CSD_DDR_BUS_WIDTH_4; + + err = __mmc_switch(card, EXT_CSD_CMD_SET_NORMAL, + EXT_CSD_BUS_WIDTH, + ext_csd_bits, + card->ext_csd.generic_cmd6_time, + MMC_TIMING_MMC_DDR52, + true, true, MMC_CMD_RETRIES); + if (err) { + pr_err("%s: switch to bus width %d ddr failed\n", + mmc_hostname(host), 1 << bus_width); + return err; + } + + /* + * 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. + * + * Even (e)MMC card can support 3.3v to 1.2v vccq, but not all + * host controller can support this, like some of the SDHCI + * controller which connect to an eMMC device. Some of these + * host controller still needs to use 1.8v vccq for supporting + * DDR mode. + * + * So the sequence will be: + * if (host and device can both support 1.2v IO) + * use 1.2v IO; + * else if (host and device can both support 1.8v IO) + * use 1.8v IO; + * so if host and device can only support 3.3v IO, this is the + * last choice. + * + * WARNING: eMMC rules are NOT the same as SD DDR + */ + if (card->mmc_avail_type & EXT_CSD_CARD_TYPE_DDR_1_2V) { + err = mmc_set_signal_voltage(host, MMC_SIGNAL_VOLTAGE_120); + if (!err) + return 0; + } + + if (card->mmc_avail_type & EXT_CSD_CARD_TYPE_DDR_1_8V && + host->caps & MMC_CAP_1_8V_DDR) + err = mmc_set_signal_voltage(host, MMC_SIGNAL_VOLTAGE_180); + + /* make sure vccq is 3.3v after switching disaster */ + if (err) + err = mmc_set_signal_voltage(host, MMC_SIGNAL_VOLTAGE_330); + + return err; +} + +static int mmc_select_hs400(struct mmc_card *card) +{ + struct mmc_host *host = card->host; + unsigned int max_dtr; + int err = 0; + u8 val; + + /* + * HS400 mode requires 8-bit bus width + */ + if (!(card->mmc_avail_type & EXT_CSD_CARD_TYPE_HS400 && + host->ios.bus_width == MMC_BUS_WIDTH_8)) + return 0; + + /* Switch card to HS mode */ + val = EXT_CSD_TIMING_HS; + err = __mmc_switch(card, EXT_CSD_CMD_SET_NORMAL, + EXT_CSD_HS_TIMING, val, + card->ext_csd.generic_cmd6_time, 0, + false, true, MMC_CMD_RETRIES); + if (err) { + pr_err("%s: switch to high-speed from hs200 failed, err:%d\n", + mmc_hostname(host), err); + return err; + } + + /* Prepare host to downgrade to HS timing */ + if (host->ops->hs400_downgrade) + host->ops->hs400_downgrade(host); + + /* Set host controller to HS timing */ + mmc_set_timing(host, MMC_TIMING_MMC_HS); + + /* Reduce frequency to HS frequency */ + max_dtr = card->ext_csd.hs_max_dtr; + mmc_set_clock(host, max_dtr); + + err = mmc_switch_status(card, true); + if (err) + goto out_err; + + if (host->ops->hs400_prepare_ddr) + host->ops->hs400_prepare_ddr(host); + + /* Switch card to DDR */ + err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL, + EXT_CSD_BUS_WIDTH, + EXT_CSD_DDR_BUS_WIDTH_8, + card->ext_csd.generic_cmd6_time); + if (err) { + pr_err("%s: switch to bus width for hs400 failed, err:%d\n", + mmc_hostname(host), err); + return err; + } + + /* Switch card to HS400 */ + val = EXT_CSD_TIMING_HS400 | + card->drive_strength << EXT_CSD_DRV_STR_SHIFT; + err = __mmc_switch(card, EXT_CSD_CMD_SET_NORMAL, + EXT_CSD_HS_TIMING, val, + card->ext_csd.generic_cmd6_time, 0, + false, true, MMC_CMD_RETRIES); + if (err) { + pr_err("%s: switch to hs400 failed, err:%d\n", + mmc_hostname(host), err); + return err; + } + + /* Set host controller to HS400 timing and frequency */ + mmc_set_timing(host, MMC_TIMING_MMC_HS400); + mmc_set_bus_speed(card); + + if (host->ops->execute_hs400_tuning) { + mmc_retune_disable(host); + err = host->ops->execute_hs400_tuning(host, card); + mmc_retune_enable(host); + if (err) + goto out_err; + } + + if (host->ops->hs400_complete) + host->ops->hs400_complete(host); + + err = mmc_switch_status(card, true); + if (err) + goto out_err; + + return 0; + +out_err: + pr_err("%s: %s failed, error %d\n", mmc_hostname(card->host), + __func__, err); + return err; +} + +int mmc_hs200_to_hs400(struct mmc_card *card) +{ + return mmc_select_hs400(card); +} + +int mmc_hs400_to_hs200(struct mmc_card *card) +{ + struct mmc_host *host = card->host; + unsigned int max_dtr; + int err; + u8 val; + + /* Reduce frequency to HS */ + max_dtr = card->ext_csd.hs_max_dtr; + mmc_set_clock(host, max_dtr); + + /* Switch HS400 to HS DDR */ + val = EXT_CSD_TIMING_HS; + err = __mmc_switch(card, EXT_CSD_CMD_SET_NORMAL, EXT_CSD_HS_TIMING, + val, card->ext_csd.generic_cmd6_time, 0, + false, true, MMC_CMD_RETRIES); + if (err) + goto out_err; + + if (host->ops->hs400_downgrade) + host->ops->hs400_downgrade(host); + + mmc_set_timing(host, MMC_TIMING_MMC_DDR52); + + err = mmc_switch_status(card, true); + if (err) + goto out_err; + + /* Switch HS DDR to HS */ + err = __mmc_switch(card, EXT_CSD_CMD_SET_NORMAL, EXT_CSD_BUS_WIDTH, + EXT_CSD_BUS_WIDTH_8, card->ext_csd.generic_cmd6_time, + 0, false, true, MMC_CMD_RETRIES); + if (err) + goto out_err; + + mmc_set_timing(host, MMC_TIMING_MMC_HS); + + err = mmc_switch_status(card, true); + if (err) + goto out_err; + + /* Switch HS to HS200 */ + val = EXT_CSD_TIMING_HS200 | + card->drive_strength << EXT_CSD_DRV_STR_SHIFT; + err = __mmc_switch(card, EXT_CSD_CMD_SET_NORMAL, EXT_CSD_HS_TIMING, + val, card->ext_csd.generic_cmd6_time, 0, + false, true, MMC_CMD_RETRIES); + if (err) + goto out_err; + + mmc_set_timing(host, MMC_TIMING_MMC_HS200); + + /* + * For HS200, CRC errors are not a reliable way to know the switch + * failed. If there really is a problem, we would expect tuning will + * fail and the result ends up the same. + */ + err = mmc_switch_status(card, false); + if (err) + goto out_err; + + mmc_set_bus_speed(card); + + /* Prepare tuning for HS400 mode. */ + if (host->ops->prepare_hs400_tuning) + host->ops->prepare_hs400_tuning(host, &host->ios); + + return 0; + +out_err: + pr_err("%s: %s failed, error %d\n", mmc_hostname(card->host), + __func__, err); + return err; +} + +static void mmc_select_driver_type(struct mmc_card *card) +{ + int card_drv_type, drive_strength, drv_type = 0; + int fixed_drv_type = card->host->fixed_drv_type; + + card_drv_type = card->ext_csd.raw_driver_strength | + mmc_driver_type_mask(0); + + if (fixed_drv_type >= 0) + drive_strength = card_drv_type & mmc_driver_type_mask(fixed_drv_type) + ? fixed_drv_type : 0; + else + drive_strength = mmc_select_drive_strength(card, + card->ext_csd.hs200_max_dtr, + card_drv_type, &drv_type); + + card->drive_strength = drive_strength; + + if (drv_type) + mmc_set_driver_type(card->host, drv_type); +} + +static int mmc_select_hs400es(struct mmc_card *card) +{ + struct mmc_host *host = card->host; + int err = -EINVAL; + u8 val; + + if (card->mmc_avail_type & EXT_CSD_CARD_TYPE_HS400_1_2V) + err = mmc_set_signal_voltage(host, MMC_SIGNAL_VOLTAGE_120); + + if (err && card->mmc_avail_type & EXT_CSD_CARD_TYPE_HS400_1_8V) + err = mmc_set_signal_voltage(host, MMC_SIGNAL_VOLTAGE_180); + + /* If fails try again during next card power cycle */ + if (err) + goto out_err; + + err = mmc_select_bus_width(card); + if (err != MMC_BUS_WIDTH_8) { + pr_err("%s: switch to 8bit bus width failed, err:%d\n", + mmc_hostname(host), err); + err = err < 0 ? err : -ENOTSUPP; + goto out_err; + } + + /* Switch card to HS mode */ + err = __mmc_switch(card, EXT_CSD_CMD_SET_NORMAL, + EXT_CSD_HS_TIMING, EXT_CSD_TIMING_HS, + card->ext_csd.generic_cmd6_time, 0, + false, true, MMC_CMD_RETRIES); + if (err) { + pr_err("%s: switch to hs for hs400es failed, err:%d\n", + mmc_hostname(host), err); + goto out_err; + } + + /* + * Bump to HS timing and frequency. Some cards don't handle + * SEND_STATUS reliably at the initial frequency. + */ + mmc_set_timing(host, MMC_TIMING_MMC_HS); + mmc_set_bus_speed(card); + + err = mmc_switch_status(card, true); + if (err) + goto out_err; + + /* Switch card to DDR with strobe bit */ + val = EXT_CSD_DDR_BUS_WIDTH_8 | EXT_CSD_BUS_WIDTH_STROBE; + err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL, + EXT_CSD_BUS_WIDTH, + val, + card->ext_csd.generic_cmd6_time); + if (err) { + pr_err("%s: switch to bus width for hs400es failed, err:%d\n", + mmc_hostname(host), err); + goto out_err; + } + + mmc_select_driver_type(card); + + /* Switch card to HS400 */ + val = EXT_CSD_TIMING_HS400 | + card->drive_strength << EXT_CSD_DRV_STR_SHIFT; + err = __mmc_switch(card, EXT_CSD_CMD_SET_NORMAL, + EXT_CSD_HS_TIMING, val, + card->ext_csd.generic_cmd6_time, 0, + false, true, MMC_CMD_RETRIES); + if (err) { + pr_err("%s: switch to hs400es failed, err:%d\n", + mmc_hostname(host), err); + goto out_err; + } + + /* Set host controller to HS400 timing and frequency */ + mmc_set_timing(host, MMC_TIMING_MMC_HS400); + + /* Controller enable enhanced strobe function */ + host->ios.enhanced_strobe = true; + if (host->ops->hs400_enhanced_strobe) + host->ops->hs400_enhanced_strobe(host, &host->ios); + + err = mmc_switch_status(card, true); + if (err) + goto out_err; + + return 0; + +out_err: + pr_err("%s: %s failed, error %d\n", mmc_hostname(card->host), + __func__, err); + return err; +} + +/* + * For device supporting HS200 mode, the following sequence + * should be done before executing the tuning process. + * 1. set the desired bus width(4-bit or 8-bit, 1-bit is not supported) + * 2. switch to HS200 mode + * 3. set the clock to > 52Mhz and <=200MHz + */ +static int mmc_select_hs200(struct mmc_card *card) +{ + struct mmc_host *host = card->host; + unsigned int old_timing, old_signal_voltage, old_clock; + int err = -EINVAL; + u8 val; + + old_signal_voltage = host->ios.signal_voltage; + if (card->mmc_avail_type & EXT_CSD_CARD_TYPE_HS200_1_2V) + err = mmc_set_signal_voltage(host, MMC_SIGNAL_VOLTAGE_120); + + if (err && card->mmc_avail_type & EXT_CSD_CARD_TYPE_HS200_1_8V) + err = mmc_set_signal_voltage(host, MMC_SIGNAL_VOLTAGE_180); + + /* If fails try again during next card power cycle */ + if (err) + return err; + + mmc_select_driver_type(card); + + /* + * Set the bus width(4 or 8) with host's support and + * switch to HS200 mode if bus width is set successfully. + */ + err = mmc_select_bus_width(card); + if (err > 0) { + val = EXT_CSD_TIMING_HS200 | + card->drive_strength << EXT_CSD_DRV_STR_SHIFT; + err = __mmc_switch(card, EXT_CSD_CMD_SET_NORMAL, + EXT_CSD_HS_TIMING, val, + card->ext_csd.generic_cmd6_time, 0, + false, true, MMC_CMD_RETRIES); + if (err) + goto err; + + /* + * Bump to HS timing and frequency. Some cards don't handle + * SEND_STATUS reliably at the initial frequency. + * NB: We can't move to full (HS200) speeds until after we've + * successfully switched over. + */ + old_timing = host->ios.timing; + old_clock = host->ios.clock; + mmc_set_timing(host, MMC_TIMING_MMC_HS200); + mmc_set_clock(card->host, card->ext_csd.hs_max_dtr); + + /* + * For HS200, CRC errors are not a reliable way to know the + * switch failed. If there really is a problem, we would expect + * tuning will fail and the result ends up the same. + */ + err = mmc_switch_status(card, false); + + /* + * mmc_select_timing() assumes timing has not changed if + * it is a switch error. + */ + if (err == -EBADMSG) { + mmc_set_clock(host, old_clock); + mmc_set_timing(host, old_timing); + } + } err: + if (err) { + /* fall back to the old signal voltage, if fails report error */ + if (mmc_set_signal_voltage(host, old_signal_voltage)) + err = -EIO; + + pr_err("%s: %s failed, error %d\n", mmc_hostname(card->host), + __func__, err); + } return err; } /* + * Activate High Speed, HS200 or HS400ES mode if supported. + */ +static int mmc_select_timing(struct mmc_card *card) +{ + int err = 0; + + if (!mmc_card_can_ext_csd(card)) + goto bus_speed; + + if (card->mmc_avail_type & EXT_CSD_CARD_TYPE_HS400ES) { + err = mmc_select_hs400es(card); + goto out; + } + + if (card->mmc_avail_type & EXT_CSD_CARD_TYPE_HS200) { + err = mmc_select_hs200(card); + if (err == -EBADMSG) + card->mmc_avail_type &= ~EXT_CSD_CARD_TYPE_HS200; + else + goto out; + } + + if (card->mmc_avail_type & EXT_CSD_CARD_TYPE_HS) + err = mmc_select_hs(card); + +out: + if (err && err != -EBADMSG) + return err; + +bus_speed: + /* + * Set the bus speed to the selected bus timing. + * If timing is not selected, backward compatible is the default. + */ + mmc_set_bus_speed(card); + return 0; +} + +/* + * Execute tuning sequence to seek the proper bus operating + * conditions for HS200 and HS400, which sends CMD21 to the device. + */ +static int mmc_hs200_tuning(struct mmc_card *card) +{ + struct mmc_host *host = card->host; + + /* + * Timing should be adjusted to the HS400 target + * operation frequency for tuning process + */ + if (card->mmc_avail_type & EXT_CSD_CARD_TYPE_HS400 && + host->ios.bus_width == MMC_BUS_WIDTH_8) + if (host->ops->prepare_hs400_tuning) + host->ops->prepare_hs400_tuning(host, &host->ios); + + return mmc_execute_tuning(card); +} + +/* * Handle the detection and initialisation of a card. * * In the case of a resume, "oldcard" will contain the card @@ -871,13 +1606,10 @@ static int mmc_init_card(struct mmc_host *host, u32 ocr, struct mmc_card *oldcard) { struct mmc_card *card; - int err, ddr = 0; + int err; 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 */ @@ -910,15 +1642,14 @@ static int mmc_init_card(struct mmc_host *host, u32 ocr, /* * Fetch CID from card. */ - if (mmc_host_is_spi(host)) - err = mmc_send_cid(host, cid); - else - err = mmc_all_send_cid(host, cid); + err = mmc_send_cid(host, cid); if (err) goto err; if (oldcard) { if (memcmp(cid, oldcard->raw_cid, sizeof(cid)) != 0) { + pr_debug("%s: Perhaps the card was replaced\n", + mmc_hostname(host)); err = -ENOENT; goto err; } @@ -934,12 +1665,19 @@ static int mmc_init_card(struct mmc_host *host, u32 ocr, goto err; } + card->ocr = ocr; card->type = MMC_TYPE_MMC; card->rca = 1; memcpy(card->raw_cid, cid, sizeof(card->raw_cid)); } /* + * Call the optional HC's init_card function to handle quirks. + */ + if (host->ops->init_card) + host->ops->init_card(host, card); + + /* * For native busses: set card RCA and quit open drain mode. */ if (!mmc_host_is_spi(host)) { @@ -967,6 +1705,13 @@ static int mmc_init_card(struct mmc_host *host, u32 ocr, } /* + * handling only for cards supporting DSR and hosts requesting + * DSR configuration + */ + if (card->csd.dsr_imp && host->dsr_req) + mmc_set_dsr(host); + + /* * Select card, as all following commands rely on that. */ if (!mmc_host_is_spi(host)) { @@ -976,23 +1721,18 @@ static int mmc_init_card(struct mmc_host *host, u32 ocr, } 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); + /* Read extended CSD. */ + err = mmc_read_ext_csd(card); if (err) goto free_card; - /* If doing byte addressing, check if required to do sector + /* + * 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))) + if (rocr & BIT(30)) mmc_card_set_blockaddr(card); /* Erase size depends on CSD and Extended CSD */ @@ -1000,11 +1740,13 @@ static int mmc_init_card(struct mmc_host *host, u32 ocr, } /* - * 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. + * Reselect the card type since host caps could have been changed when + * debugging even if the card is not new. */ - if (card->ext_csd.enhanced_area_en || - (card->ext_csd.rev >= 3 && (host->caps2 & MMC_CAP2_HC_ERASE_SZ))) { + mmc_select_card_type(card); + + /* Enable ERASE_GRP_DEF. This bit is lost after a reset or power off. */ + if (card->ext_csd.rev >= 3) { err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL, EXT_CSD_ERASE_GROUP_DEF, 1, card->ext_csd.generic_cmd6_time); @@ -1013,7 +1755,6 @@ static int mmc_init_card(struct mmc_host *host, u32 ocr, goto free_card; if (err) { - err = 0; /* * Just disable enhanced area off & sz * will try to enable ERASE_GROUP_DEF @@ -1031,7 +1772,7 @@ static int mmc_init_card(struct mmc_host *host, u32 ocr, mmc_set_erase_size(card); } } - + mmc_set_wp_grp_size(card); /* * Ensure eMMC user default partition is enabled */ @@ -1063,212 +1804,54 @@ static int mmc_init_card(struct mmc_host *host, u32 ocr, card->ext_csd.power_off_notification = EXT_CSD_POWER_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; - if (mmc_card_highspeed(card) && (max_dtr > 52000000)) - max_dtr = 52000000; - } else if (max_dtr > card->csd.max_dtr) { - max_dtr = card->csd.max_dtr; - } - - mmc_set_clock(host, max_dtr); + /* set erase_arg */ + if (mmc_card_can_discard(card)) + card->erase_arg = MMC_DISCARD_ARG; + else if (mmc_card_can_trim(card)) + card->erase_arg = MMC_TRIM_ARG; + else + card->erase_arg = MMC_ERASE_ARG; /* - * Indicate DDR mode (if supported). + * Select timing interface */ - 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; - } + err = mmc_select_timing(card); + if (err) + goto free_card; - /* - * Indicate HS200 SDR mode (if supported). - */ if (mmc_card_hs200(card)) { - u32 ext_csd_bits; - u32 bus_width = card->host->ios.bus_width; + host->doing_init_tune = 1; - /* - * 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; - } + err = mmc_hs200_tuning(card); + if (!err) + err = mmc_select_hs400(card); - 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); - if (err) - pr_warning("%s: power class selection to bus width %d" - " failed\n", mmc_hostname(card->host), - 1 << bus_width); - } + host->doing_init_tune = 0; - /* - * 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]); + if (err) + goto free_card; + } else if (mmc_card_hs400es(card)) { + if (host->ops->execute_hs400_tuning) { + err = host->ops->execute_hs400_tuning(host, card); 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; - } + goto free_card; } - - if (!err && ddr) { - err = mmc_select_powerclass(card, ext_csd_bits[idx][1]); + } else { + /* Select the desired bus width optionally */ + err = mmc_select_bus_width(card); + if (err > 0 && mmc_card_hs(card)) { + err = mmc_select_hs_ddr(card); 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); - 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); + goto free_card; } } /* + * Choose the power class with selected bus interface + */ + mmc_select_powerclass(card); + + /* * Enable HPI feature (if supported) */ if (card->ext_csd.hpi) { @@ -1278,22 +1861,27 @@ static int mmc_init_card(struct mmc_host *host, u32 ocr, if (err && err != -EBADMSG) goto free_card; if (err) { - pr_warning("%s: Enabling HPI failed\n", - mmc_hostname(card->host)); - err = 0; - } else + pr_warn("%s: Enabling HPI failed\n", + mmc_hostname(card->host)); + card->ext_csd.hpi_en = 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 cache size is higher than 0, this indicates the existence of cache + * and it can be turned on. Note that some eMMCs from Micron has been + * reported to need ~800 ms timeout, while enabling the cache after + * sudden power failure tests. Let's extend the timeout to a minimum of + * DEFAULT_CACHE_EN_TIMEOUT_MS and do it for all cards. */ - if ((host->caps2 & MMC_CAP2_CACHE_CTRL) && - card->ext_csd.cache_size > 0) { + if (card->ext_csd.cache_size > 0) { + unsigned int timeout_ms = MIN_CACHE_EN_TIMEOUT_MS; + + timeout_ms = max(card->ext_csd.generic_cmd6_time, timeout_ms); err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL, - EXT_CSD_CACHE_CTRL, 1, - card->ext_csd.generic_cmd6_time); + EXT_CSD_CACHE_CTRL, 1, timeout_ms); if (err && err != -EBADMSG) goto free_card; @@ -1301,100 +1889,151 @@ static int mmc_init_card(struct mmc_host *host, u32 ocr, * 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); + pr_warn("%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; } } /* - * The mandatory minimum values are defined for packed command. - * read: 5, write: 3 + * Enable Command Queue if supported. Note that Packed Commands cannot + * be used with Command Queue. */ - if (card->ext_csd.max_packed_writes >= 3 && - card->ext_csd.max_packed_reads >= 5 && - host->caps2 & MMC_CAP2_PACKED_CMD) { - err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL, - EXT_CSD_EXP_EVENTS_CTRL, - EXT_CSD_PACKED_EVENT_EN, - card->ext_csd.generic_cmd6_time); + card->ext_csd.cmdq_en = false; + if (card->ext_csd.cmdq_support && host->caps2 & MMC_CAP2_CQE) { + err = mmc_cmdq_enable(card); if (err && err != -EBADMSG) goto free_card; if (err) { - pr_warn("%s: Enabling packed event failed\n", + pr_warn("%s: Enabling CMDQ failed\n", mmc_hostname(card->host)); - card->ext_csd.packed_event_en = 0; - err = 0; - } else { - card->ext_csd.packed_event_en = 1; + card->ext_csd.cmdq_support = false; + card->ext_csd.cmdq_depth = 0; + } + } + /* + * In some cases (e.g. RPMB or mmc_test), the Command Queue must be + * disabled for a time, so a flag is needed to indicate to re-enable the + * Command Queue. + */ + card->reenable_cmdq = card->ext_csd.cmdq_en; + + if (host->cqe_ops && !host->cqe_enabled) { + err = host->cqe_ops->cqe_enable(host, card); + if (!err) { + host->cqe_enabled = true; + + if (card->ext_csd.cmdq_en) { + pr_info("%s: Command Queue Engine enabled\n", + mmc_hostname(host)); + } else { + host->hsq_enabled = true; + pr_info("%s: Host Software Queue enabled\n", + mmc_hostname(host)); + } } } + if (host->caps2 & MMC_CAP2_AVOID_3_3V && + host->ios.signal_voltage == MMC_SIGNAL_VOLTAGE_330) { + pr_err("%s: Host failed to negotiate down from 3.3V\n", + mmc_hostname(host)); + err = -EINVAL; + goto free_card; + } + 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; } -static int mmc_can_sleep(struct mmc_card *card) +static bool mmc_card_can_sleep(struct mmc_card *card) +{ + return card->ext_csd.rev >= 3; +} + +static int mmc_sleep_busy_cb(void *cb_data, bool *busy) { - return (card && card->ext_csd.rev >= 3); + struct mmc_host *host = cb_data; + + *busy = host->ops->card_busy(host); + return 0; } static int mmc_sleep(struct mmc_host *host) { - struct mmc_command cmd = {0}; + struct mmc_command cmd = {}; struct mmc_card *card = host->card; + unsigned int timeout_ms = DIV_ROUND_UP(card->ext_csd.sa_timeout, 10000); + bool use_r1b_resp; int err; - if (host->caps2 & MMC_CAP2_NO_SLEEP_CMD) - return 0; + /* Re-tuning can't be done once the card is deselected */ + mmc_retune_hold(host); err = mmc_deselect_cards(host); if (err) - return err; + goto out_release; cmd.opcode = MMC_SLEEP_AWAKE; cmd.arg = card->rca << 16; cmd.arg |= 1 << 15; + use_r1b_resp = mmc_prepare_busy_cmd(host, &cmd, timeout_ms); - cmd.flags = MMC_RSP_R1B | MMC_CMD_AC; err = mmc_wait_for_cmd(host, &cmd, 0); if (err) - return err; + goto out_release; /* - * If the host does not wait while the card signals busy, then we will - * will have to wait the sleep/awake timeout. Note, we cannot use the - * SEND_STATUS command to poll the status because that command (and most - * others) is invalid while the card sleeps. + * If the host does not wait while the card signals busy, then we can + * try to poll, but only if the host supports HW polling, as the + * SEND_STATUS cmd is not allowed. If we can't poll, then we simply need + * to wait the sleep/awake timeout. */ - if (!(host->caps & MMC_CAP_WAIT_WHILE_BUSY)) - mmc_delay(DIV_ROUND_UP(card->ext_csd.sa_timeout, 10000)); + if (host->caps & MMC_CAP_WAIT_WHILE_BUSY && use_r1b_resp) + goto out_release; + if (!host->ops->card_busy) { + mmc_delay(timeout_ms); + goto out_release; + } + + err = __mmc_poll_for_busy(host, 0, timeout_ms, &mmc_sleep_busy_cb, host); + +out_release: + mmc_retune_release(host); return err; } -static int mmc_can_poweroff_notify(const struct mmc_card *card) +static bool mmc_card_can_poweroff_notify(const struct mmc_card *card) { return card && mmc_card_mmc(card) && (card->ext_csd.power_off_notification == EXT_CSD_POWER_ON); } +static bool mmc_host_can_poweroff_notify(const struct mmc_host *host, + enum mmc_poweroff_type pm_type) +{ + if (host->caps2 & MMC_CAP2_FULL_PWR_CYCLE) + return true; + + if (host->caps2 & MMC_CAP2_FULL_PWR_CYCLE_IN_SUSPEND && + pm_type == MMC_POWEROFF_SUSPEND) + return true; + + return pm_type == MMC_POWEROFF_SHUTDOWN; +} + static int mmc_poweroff_notify(struct mmc_card *card, unsigned int notify_type) { unsigned int timeout = card->ext_csd.generic_cmd6_time; @@ -1404,9 +2043,9 @@ static int mmc_poweroff_notify(struct mmc_card *card, unsigned int notify_type) if (notify_type == EXT_CSD_POWER_OFF_LONG) timeout = card->ext_csd.power_off_longtime; - err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL, - EXT_CSD_POWER_OFF_NOTIFICATION, - notify_type, timeout); + err = __mmc_switch(card, EXT_CSD_CMD_SET_NORMAL, + EXT_CSD_POWER_OFF_NOTIFICATION, + notify_type, timeout, 0, false, false, MMC_CMD_RETRIES); if (err) pr_err("%s: Power Off Notification timed out, %u\n", mmc_hostname(card->host), timeout); @@ -1418,18 +2057,6 @@ static int mmc_poweroff_notify(struct mmc_card *card, unsigned int notify_type) } /* - * 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) @@ -1444,20 +2071,18 @@ static void mmc_detect(struct mmc_host *host) { int err; - BUG_ON(!host); - BUG_ON(!host->card); - - mmc_get_card(host->card); + mmc_get_card(host->card, NULL); /* * Just check if our card has been removed. */ err = _mmc_detect_card_removed(host); - mmc_put_card(host->card); + mmc_put_card(host->card, NULL); if (err) { - mmc_remove(host); + mmc_remove_card(host->card); + host->card = NULL; mmc_claim_host(host); mmc_detach_bus(host); @@ -1466,81 +2091,164 @@ static void mmc_detect(struct mmc_host *host) } } -static int _mmc_suspend(struct mmc_host *host, bool is_suspend) +static bool _mmc_cache_enabled(struct mmc_host *host) +{ + return host->card->ext_csd.cache_size > 0 && + host->card->ext_csd.cache_ctrl & 1; +} + +/* + * Flush the internal cache of the eMMC to non-volatile storage. + */ +static int _mmc_flush_cache(struct mmc_host *host) +{ + int err = 0; + + if (mmc_card_broken_cache_flush(host->card) && !host->card->written_flag) + return 0; + + if (_mmc_cache_enabled(host)) { + err = mmc_switch(host->card, EXT_CSD_CMD_SET_NORMAL, + EXT_CSD_FLUSH_CACHE, 1, + CACHE_FLUSH_TIMEOUT_MS); + if (err) + pr_err("%s: cache flush error %d\n", mmc_hostname(host), err); + else + host->card->written_flag = false; + } + + return err; +} + +static int _mmc_suspend(struct mmc_host *host, enum mmc_poweroff_type pm_type) { + unsigned int notify_type = EXT_CSD_POWER_OFF_SHORT; int err = 0; - unsigned int notify_type = is_suspend ? EXT_CSD_POWER_OFF_SHORT : - EXT_CSD_POWER_OFF_LONG; - BUG_ON(!host); - BUG_ON(!host->card); + if (pm_type == MMC_POWEROFF_SHUTDOWN) + notify_type = EXT_CSD_POWER_OFF_LONG; mmc_claim_host(host); - if (mmc_card_doing_bkops(host->card)) { - err = mmc_stop_bkops(host->card); + if (mmc_card_suspended(host->card)) + goto out; + + /* + * For the undervoltage case, we care more about device integrity. + * Avoid cache flush and notify the device to power off quickly. + */ + if (pm_type != MMC_POWEROFF_UNDERVOLTAGE) { + err = _mmc_flush_cache(host); if (err) goto out; } - err = mmc_cache_ctrl(host, 0); - if (err) - goto out; - - if (mmc_can_poweroff_notify(host->card) && - ((host->caps2 & MMC_CAP2_FULL_PWR_CYCLE) || !is_suspend)) + if (mmc_card_can_poweroff_notify(host->card) && + mmc_host_can_poweroff_notify(host, pm_type)) err = mmc_poweroff_notify(host->card, notify_type); - else if (mmc_can_sleep(host->card)) + else if (mmc_card_can_sleep(host->card)) err = mmc_sleep(host); else if (!mmc_host_is_spi(host)) err = mmc_deselect_cards(host); - host->card->state &= ~(MMC_STATE_HIGHSPEED | MMC_STATE_HIGHSPEED_200); - if (!err) + if (!err) { mmc_power_off(host); + mmc_card_set_suspended(host->card); + } out: mmc_release_host(host); return err; } /* - * Suspend callback from host. + * Host is being removed. Free up the current card and do a graceful power-off. */ -static int mmc_suspend(struct mmc_host *host) +static void mmc_remove(struct mmc_host *host) { - return _mmc_suspend(host, true); + get_device(&host->card->dev); + mmc_remove_card(host->card); + + _mmc_suspend(host, MMC_POWEROFF_UNBIND); + + put_device(&host->card->dev); + host->card = NULL; } /* - * Shutdown callback + * Suspend callback */ -static int mmc_shutdown(struct mmc_host *host) +static int mmc_suspend(struct mmc_host *host) { - return _mmc_suspend(host, false); + int err; + + err = _mmc_suspend(host, MMC_POWEROFF_SUSPEND); + if (!err) { + pm_runtime_disable(&host->card->dev); + pm_runtime_set_suspended(&host->card->dev); + } + + 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) +static int _mmc_resume(struct mmc_host *host) { - int err; - - BUG_ON(!host); - BUG_ON(!host->card); + int err = 0; mmc_claim_host(host); - mmc_power_up(host); - mmc_select_voltage(host, host->ocr); - err = mmc_init_card(host, host->ocr, host->card); + + if (!mmc_card_suspended(host->card)) + goto out; + + mmc_power_up(host, host->card->ocr); + err = mmc_init_card(host, host->card->ocr, host->card); + mmc_card_clr_suspended(host->card); + +out: mmc_release_host(host); + return err; +} + +/* + * Shutdown callback + */ +static int mmc_shutdown(struct mmc_host *host) +{ + int err = 0; + + /* + * In case of undervoltage, the card will be powered off (removed) by + * _mmc_handle_undervoltage() + */ + if (mmc_card_removed(host->card)) + return 0; + + /* + * If the card remains suspended at this point and it was done by using + * the sleep-cmd (CMD5), we may need to re-initialize it first, to allow + * us to send the preferred poweroff-notification cmd at shutdown. + */ + if (mmc_card_can_poweroff_notify(host->card) && + !mmc_host_can_poweroff_notify(host, MMC_POWEROFF_SUSPEND)) + err = _mmc_resume(host); + + if (!err) + err = _mmc_suspend(host, MMC_POWEROFF_SHUTDOWN); return err; } +/* + * Callback for resume. + */ +static int mmc_resume(struct mmc_host *host) +{ + pm_runtime_enable(&host->card->dev); + return 0; +} /* * Callback for runtime_suspend. @@ -1552,18 +2260,11 @@ static int mmc_runtime_suspend(struct mmc_host *host) if (!(host->caps & MMC_CAP_AGGRESSIVE_PM)) return 0; - mmc_claim_host(host); - - err = mmc_suspend(host); - if (err) { - pr_err("%s: error %d doing aggessive suspend\n", + err = _mmc_suspend(host, MMC_POWEROFF_SUSPEND); + if (err) + pr_err("%s: error %d doing aggressive suspend\n", mmc_hostname(host), err); - goto out; - } - mmc_power_off(host); -out: - mmc_release_host(host); return err; } @@ -1574,75 +2275,119 @@ static int mmc_runtime_resume(struct mmc_host *host) { int err; - if (!(host->caps & MMC_CAP_AGGRESSIVE_PM)) - return 0; - - mmc_claim_host(host); - - mmc_power_up(host); - err = mmc_resume(host); - if (err) - pr_err("%s: error %d doing aggessive resume\n", + err = _mmc_resume(host); + if (err && err != -ENOMEDIUM) + pr_err("%s: error %d doing runtime resume\n", mmc_hostname(host), err); - mmc_release_host(host); return 0; } -static int mmc_power_restore(struct mmc_host *host) +static bool mmc_card_can_reset(struct mmc_card *card) { - int ret; + u8 rst_n_function; - host->card->state &= ~(MMC_STATE_HIGHSPEED | MMC_STATE_HIGHSPEED_200); - mmc_claim_host(host); - ret = mmc_init_card(host, host->ocr, host->card); - mmc_release_host(host); + rst_n_function = card->ext_csd.rst_n_function; + return ((rst_n_function & EXT_CSD_RST_N_EN_MASK) == EXT_CSD_RST_N_ENABLED); +} + +static int _mmc_hw_reset(struct mmc_host *host) +{ + struct mmc_card *card = host->card; - return ret; + /* + * In the case of recovery, we can't expect flushing the cache to work + * always, but we have a go and ignore errors. + */ + _mmc_flush_cache(host); + + if ((host->caps & MMC_CAP_HW_RESET) && host->ops->card_hw_reset && + mmc_card_can_reset(card)) { + /* If the card accept RST_n signal, send it. */ + mmc_set_clock(host, host->f_init); + host->ops->card_hw_reset(host); + /* Set initial state and call mmc_set_ios */ + mmc_set_initial_state(host); + } else { + /* Do a brute force power cycle */ + mmc_power_cycle(host, card->ocr); + mmc_pwrseq_reset(host); + } + return mmc_init_card(host, card->ocr, card); } -static const struct mmc_bus_ops mmc_ops = { - .remove = mmc_remove, - .detect = mmc_detect, - .suspend = NULL, - .resume = NULL, - .power_restore = mmc_power_restore, - .alive = mmc_alive, - .shutdown = mmc_shutdown, -}; +/** + * _mmc_handle_undervoltage - Handle an undervoltage event for MMC/eMMC devices + * @host: MMC host structure + * + * This function is triggered when an undervoltage condition is detected. + * It attempts to transition the device into a low-power or safe state to + * prevent data corruption. + * + * Steps performed: + * - Perform an emergency suspend using EXT_CSD_POWER_OFF_SHORT if possible. + * - If power-off notify is not supported, fallback mechanisms like sleep or + * deselecting the card are attempted. + * - Cache flushing is skipped to reduce execution time. + * - Mark the card as removed to prevent further interactions after + * undervoltage. + * + * Note: This function does not handle host claiming or releasing. The caller + * must ensure that the host is properly claimed before calling this + * function and released afterward. + * + * Returns: 0 on success, or a negative error code if any step fails. + */ +static int _mmc_handle_undervoltage(struct mmc_host *host) +{ + struct mmc_card *card = host->card; + int err; -static const struct mmc_bus_ops mmc_ops_unsafe = { + /* + * Perform an emergency suspend to power off the eMMC quickly. + * This ensures the device enters a safe state before power is lost. + * We first attempt EXT_CSD_POWER_OFF_SHORT, but if power-off notify + * is not supported, we fall back to sleep mode or deselecting the card. + * Cache flushing is skipped to minimize delay. + */ + err = _mmc_suspend(host, MMC_POWEROFF_UNDERVOLTAGE); + if (err) + pr_err("%s: undervoltage suspend failed: %pe\n", + mmc_hostname(host), ERR_PTR(err)); + + /* + * Mark the card as removed to prevent further operations. + * This ensures the system does not attempt to access the device + * after an undervoltage event, avoiding potential corruption. + */ + mmc_card_set_removed(card); + + return err; +} + +static const struct mmc_bus_ops mmc_ops = { .remove = mmc_remove, .detect = mmc_detect, .suspend = mmc_suspend, .resume = mmc_resume, .runtime_suspend = mmc_runtime_suspend, .runtime_resume = mmc_runtime_resume, - .power_restore = mmc_power_restore, .alive = mmc_alive, .shutdown = mmc_shutdown, + .hw_reset = _mmc_hw_reset, + .cache_enabled = _mmc_cache_enabled, + .flush_cache = _mmc_flush_cache, + .handle_undervoltage = _mmc_handle_undervoltage, }; -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; + u32 ocr, rocr; - BUG_ON(!host); WARN_ON(!host->claimed); /* Set correct bus mode for MMC before attempting attach */ @@ -1653,7 +2398,7 @@ int mmc_attach_mmc(struct mmc_host *host) if (err) return err; - mmc_attach_bus_ops(host); + mmc_attach_bus(host, &mmc_ops); if (host->ocr_avail_mmc) host->ocr_avail = host->ocr_avail_mmc; @@ -1666,23 +2411,12 @@ int mmc_attach_mmc(struct mmc_host *host) 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); + rocr = mmc_select_voltage(host, ocr); /* * Can we support the voltage of the card? */ - if (!host->ocr) { + if (!rocr) { err = -EINVAL; goto err; } @@ -1690,20 +2424,19 @@ int mmc_attach_mmc(struct mmc_host *host) /* * Detect and init the card. */ - err = mmc_init_card(host, host->ocr, NULL); + err = mmc_init_card(host, rocr, NULL); if (err) goto err; mmc_release_host(host); err = mmc_add_card(host->card); - mmc_claim_host(host); if (err) goto remove_card; + mmc_claim_host(host); return 0; remove_card: - mmc_release_host(host); mmc_remove_card(host->card); mmc_claim_host(host); host->card = NULL; |