diff options
Diffstat (limited to 'drivers/mmc/core/sd.c')
| -rw-r--r-- | drivers/mmc/core/sd.c | 1881 |
1 files changed, 1881 insertions, 0 deletions
diff --git a/drivers/mmc/core/sd.c b/drivers/mmc/core/sd.c new file mode 100644 index 000000000..246ce027a --- /dev/null +++ b/drivers/mmc/core/sd.c @@ -0,0 +1,1881 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * linux/drivers/mmc/core/sd.c + * + * Copyright (C) 2003-2004 Russell King, All Rights Reserved. + * SD support Copyright (C) 2004 Ian Molton, All Rights Reserved. + * Copyright (C) 2005-2007 Pierre Ossman, All Rights Reserved. + */ + +#include <linux/err.h> +#include <linux/sizes.h> +#include <linux/slab.h> +#include <linux/stat.h> +#include <linux/pm_runtime.h> +#include <linux/random.h> +#include <linux/scatterlist.h> +#include <linux/sysfs.h> + +#include <linux/mmc/host.h> +#include <linux/mmc/card.h> +#include <linux/mmc/mmc.h> +#include <linux/mmc/sd.h> + +#include "core.h" +#include "card.h" +#include "host.h" +#include "bus.h" +#include "mmc_ops.h" +#include "sd.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 taac_exp[] = { + 1, 10, 100, 1000, 10000, 100000, 1000000, 10000000, +}; + +static const unsigned int taac_mant[] = { + 0, 10, 12, 13, 15, 20, 25, 30, + 35, 40, 45, 50, 55, 60, 70, 80, +}; + +static const unsigned int sd_au_size[] = { + 0, SZ_16K / 512, SZ_32K / 512, SZ_64K / 512, + SZ_128K / 512, SZ_256K / 512, SZ_512K / 512, SZ_1M / 512, + SZ_2M / 512, SZ_4M / 512, SZ_8M / 512, (SZ_8M + SZ_4M) / 512, + SZ_16M / 512, (SZ_16M + SZ_8M) / 512, SZ_32M / 512, SZ_64M / 512, +}; + +#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; \ + }) + +#define SD_POWEROFF_NOTIFY_TIMEOUT_MS 1000 +#define SD_WRITE_EXTR_SINGLE_TIMEOUT_MS 1000 + +struct sd_busy_data { + struct mmc_card *card; + u8 *reg_buf; +}; + +/* + * Given the decoded CSD structure, decode the raw CID to our CID structure. + */ +void 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)); + + /* + * SD doesn't currently have a version field so we will + * have to assume we can parse this. + */ + 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.hwrev = UNSTUFF_BITS(resp, 60, 4); + card->cid.fwrev = UNSTUFF_BITS(resp, 56, 4); + card->cid.serial = UNSTUFF_BITS(resp, 24, 32); + card->cid.year = UNSTUFF_BITS(resp, 12, 8); + card->cid.month = UNSTUFF_BITS(resp, 8, 4); + + card->cid.year += 2000; /* SD cards year offset */ +} + +/* + * 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, csd_struct; + u32 *resp = card->raw_csd; + + csd_struct = UNSTUFF_BITS(resp, 126, 2); + + switch (csd_struct) { + case 0: + 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); + 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->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 (UNSTUFF_BITS(resp, 46, 1)) { + csd->erase_size = 1; + } else if (csd->write_blkbits >= 9) { + csd->erase_size = UNSTUFF_BITS(resp, 39, 7) + 1; + csd->erase_size <<= csd->write_blkbits - 9; + } + + if (UNSTUFF_BITS(resp, 13, 1)) + mmc_card_set_readonly(card); + break; + case 1: + /* + * This is a block-addressed SDHC or SDXC card. Most + * interesting fields are unused and have fixed + * values. To avoid getting tripped by buggy cards, + * we assume those fixed values ourselves. + */ + mmc_card_set_blockaddr(card); + + csd->taac_ns = 0; /* Unused */ + csd->taac_clks = 0; /* Unused */ + + 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->c_size = UNSTUFF_BITS(resp, 48, 22); + + /* SDXC cards have a minimum C_SIZE of 0x00FFFF */ + if (csd->c_size >= 0xFFFF) + mmc_card_set_ext_capacity(card); + + m = UNSTUFF_BITS(resp, 48, 22); + csd->capacity = (1 + m) << 10; + + csd->read_blkbits = 9; + csd->read_partial = 0; + csd->write_misalign = 0; + csd->read_misalign = 0; + csd->r2w_factor = 4; /* Unused */ + csd->write_blkbits = 9; + csd->write_partial = 0; + csd->erase_size = 1; + + if (UNSTUFF_BITS(resp, 13, 1)) + mmc_card_set_readonly(card); + break; + default: + pr_err("%s: unrecognised CSD structure version %d\n", + mmc_hostname(card->host), csd_struct); + return -EINVAL; + } + + card->erase_size = csd->erase_size; + + return 0; +} + +/* + * Given a 64-bit response, decode to our card SCR structure. + */ +static int mmc_decode_scr(struct mmc_card *card) +{ + struct sd_scr *scr = &card->scr; + unsigned int scr_struct; + u32 resp[4]; + + resp[3] = card->raw_scr[1]; + resp[2] = card->raw_scr[0]; + + scr_struct = UNSTUFF_BITS(resp, 60, 4); + if (scr_struct != 0) { + pr_err("%s: unrecognised SCR structure version %d\n", + mmc_hostname(card->host), scr_struct); + return -EINVAL; + } + + scr->sda_vsn = UNSTUFF_BITS(resp, 56, 4); + scr->bus_widths = UNSTUFF_BITS(resp, 48, 4); + if (scr->sda_vsn == SCR_SPEC_VER_2) + /* Check if Physical Layer Spec v3.0 is supported */ + scr->sda_spec3 = UNSTUFF_BITS(resp, 47, 1); + + if (scr->sda_spec3) { + scr->sda_spec4 = UNSTUFF_BITS(resp, 42, 1); + scr->sda_specx = UNSTUFF_BITS(resp, 38, 4); + } + + if (UNSTUFF_BITS(resp, 55, 1)) + card->erased_byte = 0xFF; + else + card->erased_byte = 0x0; + + if (scr->sda_spec4) + scr->cmds = UNSTUFF_BITS(resp, 32, 4); + else if (scr->sda_spec3) + scr->cmds = UNSTUFF_BITS(resp, 32, 2); + + /* SD Spec says: any SD Card shall set at least bits 0 and 2 */ + if (!(scr->bus_widths & SD_SCR_BUS_WIDTH_1) || + !(scr->bus_widths & SD_SCR_BUS_WIDTH_4)) { + pr_err("%s: invalid bus width\n", mmc_hostname(card->host)); + return -EINVAL; + } + + return 0; +} + +/* + * Fetch and process SD Status register. + */ +static int mmc_read_ssr(struct mmc_card *card) +{ + unsigned int au, es, et, eo; + __be32 *raw_ssr; + u32 resp[4] = {}; + u8 discard_support; + int i; + + if (!(card->csd.cmdclass & CCC_APP_SPEC)) { + pr_warn("%s: card lacks mandatory SD Status function\n", + mmc_hostname(card->host)); + return 0; + } + + raw_ssr = kmalloc(sizeof(card->raw_ssr), GFP_KERNEL); + if (!raw_ssr) + return -ENOMEM; + + if (mmc_app_sd_status(card, raw_ssr)) { + pr_warn("%s: problem reading SD Status register\n", + mmc_hostname(card->host)); + kfree(raw_ssr); + return 0; + } + + for (i = 0; i < 16; i++) + card->raw_ssr[i] = be32_to_cpu(raw_ssr[i]); + + kfree(raw_ssr); + + /* + * UNSTUFF_BITS only works with four u32s so we have to offset the + * bitfield positions accordingly. + */ + au = UNSTUFF_BITS(card->raw_ssr, 428 - 384, 4); + if (au) { + if (au <= 9 || card->scr.sda_spec3) { + card->ssr.au = sd_au_size[au]; + es = UNSTUFF_BITS(card->raw_ssr, 408 - 384, 16); + et = UNSTUFF_BITS(card->raw_ssr, 402 - 384, 6); + if (es && et) { + eo = UNSTUFF_BITS(card->raw_ssr, 400 - 384, 2); + card->ssr.erase_timeout = (et * 1000) / es; + card->ssr.erase_offset = eo * 1000; + } + } else { + pr_warn("%s: SD Status: Invalid Allocation Unit size\n", + mmc_hostname(card->host)); + } + } + + /* + * starting SD5.1 discard is supported if DISCARD_SUPPORT (b313) is set + */ + resp[3] = card->raw_ssr[6]; + discard_support = UNSTUFF_BITS(resp, 313 - 288, 1); + card->erase_arg = (card->scr.sda_specx && discard_support) ? + SD_DISCARD_ARG : SD_ERASE_ARG; + + return 0; +} + +/* + * Fetches and decodes switch information + */ +static int mmc_read_switch(struct mmc_card *card) +{ + int err; + u8 *status; + + if (card->scr.sda_vsn < SCR_SPEC_VER_1) + return 0; + + if (!(card->csd.cmdclass & CCC_SWITCH)) { + pr_warn("%s: card lacks mandatory switch function, performance might suffer\n", + mmc_hostname(card->host)); + return 0; + } + + status = kmalloc(64, GFP_KERNEL); + if (!status) + return -ENOMEM; + + /* + * Find out the card's support bits with a mode 0 operation. + * The argument does not matter, as the support bits do not + * change with the arguments. + */ + err = mmc_sd_switch(card, 0, 0, 0, status); + if (err) { + /* + * If the host or the card can't do the switch, + * fail more gracefully. + */ + if (err != -EINVAL && err != -ENOSYS && err != -EFAULT) + goto out; + + pr_warn("%s: problem reading Bus Speed modes\n", + mmc_hostname(card->host)); + err = 0; + + goto out; + } + + if (status[13] & SD_MODE_HIGH_SPEED) + card->sw_caps.hs_max_dtr = HIGH_SPEED_MAX_DTR; + + if (card->scr.sda_spec3) { + card->sw_caps.sd3_bus_mode = status[13]; + /* Driver Strengths supported by the card */ + card->sw_caps.sd3_drv_type = status[9]; + card->sw_caps.sd3_curr_limit = status[7] | status[6] << 8; + } + +out: + kfree(status); + + return err; +} + +/* + * Test if the card supports high-speed mode and, if so, switch to it. + */ +int mmc_sd_switch_hs(struct mmc_card *card) +{ + int err; + u8 *status; + + if (card->scr.sda_vsn < SCR_SPEC_VER_1) + return 0; + + if (!(card->csd.cmdclass & CCC_SWITCH)) + return 0; + + if (!(card->host->caps & MMC_CAP_SD_HIGHSPEED)) + return 0; + + if (card->sw_caps.hs_max_dtr == 0) + return 0; + + status = kmalloc(64, GFP_KERNEL); + if (!status) + return -ENOMEM; + + err = mmc_sd_switch(card, 1, 0, HIGH_SPEED_BUS_SPEED, status); + if (err) + goto out; + + if ((status[16] & 0xF) != HIGH_SPEED_BUS_SPEED) { + pr_warn("%s: Problem switching card into high-speed mode!\n", + mmc_hostname(card->host)); + err = 0; + } else { + err = 1; + } + +out: + kfree(status); + + return err; +} + +static int sd_select_driver_type(struct mmc_card *card, u8 *status) +{ + int card_drv_type, drive_strength, drv_type; + int err; + + card->drive_strength = 0; + + card_drv_type = card->sw_caps.sd3_drv_type | SD_DRIVER_TYPE_B; + + drive_strength = mmc_select_drive_strength(card, + card->sw_caps.uhs_max_dtr, + card_drv_type, &drv_type); + + if (drive_strength) { + err = mmc_sd_switch(card, 1, 2, drive_strength, status); + if (err) + return err; + if ((status[15] & 0xF) != drive_strength) { + pr_warn("%s: Problem setting drive strength!\n", + mmc_hostname(card->host)); + return 0; + } + card->drive_strength = drive_strength; + } + + if (drv_type) + mmc_set_driver_type(card->host, drv_type); + + return 0; +} + +static void sd_update_bus_speed_mode(struct mmc_card *card) +{ + /* + * If the host doesn't support any of the UHS-I modes, fallback on + * default speed. + */ + if (!mmc_host_uhs(card->host)) { + card->sd_bus_speed = 0; + return; + } + + if ((card->host->caps & MMC_CAP_UHS_SDR104) && + (card->sw_caps.sd3_bus_mode & SD_MODE_UHS_SDR104)) { + card->sd_bus_speed = UHS_SDR104_BUS_SPEED; + } else if ((card->host->caps & MMC_CAP_UHS_DDR50) && + (card->sw_caps.sd3_bus_mode & SD_MODE_UHS_DDR50)) { + card->sd_bus_speed = UHS_DDR50_BUS_SPEED; + } else if ((card->host->caps & (MMC_CAP_UHS_SDR104 | + MMC_CAP_UHS_SDR50)) && (card->sw_caps.sd3_bus_mode & + SD_MODE_UHS_SDR50)) { + card->sd_bus_speed = UHS_SDR50_BUS_SPEED; + } else if ((card->host->caps & (MMC_CAP_UHS_SDR104 | + MMC_CAP_UHS_SDR50 | MMC_CAP_UHS_SDR25)) && + (card->sw_caps.sd3_bus_mode & SD_MODE_UHS_SDR25)) { + card->sd_bus_speed = UHS_SDR25_BUS_SPEED; + } else if ((card->host->caps & (MMC_CAP_UHS_SDR104 | + MMC_CAP_UHS_SDR50 | MMC_CAP_UHS_SDR25 | + MMC_CAP_UHS_SDR12)) && (card->sw_caps.sd3_bus_mode & + SD_MODE_UHS_SDR12)) { + card->sd_bus_speed = UHS_SDR12_BUS_SPEED; + } +} + +static int sd_set_bus_speed_mode(struct mmc_card *card, u8 *status) +{ + int err; + unsigned int timing = 0; + + switch (card->sd_bus_speed) { + case UHS_SDR104_BUS_SPEED: + timing = MMC_TIMING_UHS_SDR104; + card->sw_caps.uhs_max_dtr = UHS_SDR104_MAX_DTR; + break; + case UHS_DDR50_BUS_SPEED: + timing = MMC_TIMING_UHS_DDR50; + card->sw_caps.uhs_max_dtr = UHS_DDR50_MAX_DTR; + break; + case UHS_SDR50_BUS_SPEED: + timing = MMC_TIMING_UHS_SDR50; + card->sw_caps.uhs_max_dtr = UHS_SDR50_MAX_DTR; + break; + case UHS_SDR25_BUS_SPEED: + timing = MMC_TIMING_UHS_SDR25; + card->sw_caps.uhs_max_dtr = UHS_SDR25_MAX_DTR; + break; + case UHS_SDR12_BUS_SPEED: + timing = MMC_TIMING_UHS_SDR12; + card->sw_caps.uhs_max_dtr = UHS_SDR12_MAX_DTR; + break; + default: + return 0; + } + + err = mmc_sd_switch(card, 1, 0, card->sd_bus_speed, status); + if (err) + return err; + + if ((status[16] & 0xF) != card->sd_bus_speed) + pr_warn("%s: Problem setting bus speed mode!\n", + mmc_hostname(card->host)); + else { + mmc_set_timing(card->host, timing); + mmc_set_clock(card->host, card->sw_caps.uhs_max_dtr); + } + + return 0; +} + +/* Get host's max current setting at its current voltage */ +static u32 sd_get_host_max_current(struct mmc_host *host) +{ + u32 voltage, max_current; + + voltage = 1 << host->ios.vdd; + switch (voltage) { + case MMC_VDD_165_195: + max_current = host->max_current_180; + break; + case MMC_VDD_29_30: + case MMC_VDD_30_31: + max_current = host->max_current_300; + break; + case MMC_VDD_32_33: + case MMC_VDD_33_34: + max_current = host->max_current_330; + break; + default: + max_current = 0; + } + + return max_current; +} + +static int sd_set_current_limit(struct mmc_card *card, u8 *status) +{ + int current_limit = SD_SET_CURRENT_NO_CHANGE; + int err; + u32 max_current; + + /* + * Current limit switch is only defined for SDR50, SDR104, and DDR50 + * bus speed modes. For other bus speed modes, we do not change the + * current limit. + */ + if ((card->sd_bus_speed != UHS_SDR50_BUS_SPEED) && + (card->sd_bus_speed != UHS_SDR104_BUS_SPEED) && + (card->sd_bus_speed != UHS_DDR50_BUS_SPEED)) + return 0; + + /* + * Host has different current capabilities when operating at + * different voltages, so find out its max current first. + */ + max_current = sd_get_host_max_current(card->host); + + /* + * We only check host's capability here, if we set a limit that is + * higher than the card's maximum current, the card will be using its + * maximum current, e.g. if the card's maximum current is 300ma, and + * when we set current limit to 200ma, the card will draw 200ma, and + * when we set current limit to 400/600/800ma, the card will draw its + * maximum 300ma from the host. + * + * The above is incorrect: if we try to set a current limit that is + * not supported by the card, the card can rightfully error out the + * attempt, and remain at the default current limit. This results + * in a 300mA card being limited to 200mA even though the host + * supports 800mA. Failures seen with SanDisk 8GB UHS cards with + * an iMX6 host. --rmk + */ + if (max_current >= 800 && + card->sw_caps.sd3_curr_limit & SD_MAX_CURRENT_800) + current_limit = SD_SET_CURRENT_LIMIT_800; + else if (max_current >= 600 && + card->sw_caps.sd3_curr_limit & SD_MAX_CURRENT_600) + current_limit = SD_SET_CURRENT_LIMIT_600; + else if (max_current >= 400 && + card->sw_caps.sd3_curr_limit & SD_MAX_CURRENT_400) + current_limit = SD_SET_CURRENT_LIMIT_400; + else if (max_current >= 200 && + card->sw_caps.sd3_curr_limit & SD_MAX_CURRENT_200) + current_limit = SD_SET_CURRENT_LIMIT_200; + + if (current_limit != SD_SET_CURRENT_NO_CHANGE) { + err = mmc_sd_switch(card, 1, 3, current_limit, status); + if (err) + return err; + + if (((status[15] >> 4) & 0x0F) != current_limit) + pr_warn("%s: Problem setting current limit!\n", + mmc_hostname(card->host)); + + } + + return 0; +} + +/* + * UHS-I specific initialization procedure + */ +static int mmc_sd_init_uhs_card(struct mmc_card *card) +{ + int err; + u8 *status; + + if (!(card->csd.cmdclass & CCC_SWITCH)) + return 0; + + status = kmalloc(64, GFP_KERNEL); + if (!status) + return -ENOMEM; + + /* Set 4-bit bus width */ + err = mmc_app_set_bus_width(card, MMC_BUS_WIDTH_4); + if (err) + goto out; + + mmc_set_bus_width(card->host, MMC_BUS_WIDTH_4); + + /* + * Select the bus speed mode depending on host + * and card capability. + */ + sd_update_bus_speed_mode(card); + + /* Set the driver strength for the card */ + err = sd_select_driver_type(card, status); + if (err) + goto out; + + /* Set current limit for the card */ + err = sd_set_current_limit(card, status); + if (err) + goto out; + + /* Set bus speed mode of the card */ + err = sd_set_bus_speed_mode(card, status); + if (err) + goto out; + + /* + * SPI mode doesn't define CMD19 and tuning is only valid for SDR50 and + * SDR104 mode SD-cards. Note that tuning is mandatory for SDR104. + */ + if (!mmc_host_is_spi(card->host) && + (card->host->ios.timing == MMC_TIMING_UHS_SDR50 || + card->host->ios.timing == MMC_TIMING_UHS_DDR50 || + card->host->ios.timing == MMC_TIMING_UHS_SDR104)) { + err = mmc_execute_tuning(card); + + /* + * As SD Specifications Part1 Physical Layer Specification + * Version 3.01 says, CMD19 tuning is available for unlocked + * cards in transfer state of 1.8V signaling mode. The small + * difference between v3.00 and 3.01 spec means that CMD19 + * tuning is also available for DDR50 mode. + */ + if (err && card->host->ios.timing == MMC_TIMING_UHS_DDR50) { + pr_warn("%s: ddr50 tuning failed\n", + mmc_hostname(card->host)); + err = 0; + } + } + +out: + kfree(status); + + 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(scr, "%08x%08x\n", card->raw_scr[0], card->raw_scr[1]); +MMC_DEV_ATTR(ssr, + "%08x%08x%08x%08x%08x%08x%08x%08x%08x%08x%08x%08x%08x%08x%08x%08x\n", + card->raw_ssr[0], card->raw_ssr[1], card->raw_ssr[2], + card->raw_ssr[3], card->raw_ssr[4], card->raw_ssr[5], + card->raw_ssr[6], card->raw_ssr[7], card->raw_ssr[8], + card->raw_ssr[9], card->raw_ssr[10], card->raw_ssr[11], + card->raw_ssr[12], card->raw_ssr[13], card->raw_ssr[14], + card->raw_ssr[15]); +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(ocr, "0x%08x\n", card->ocr); +MMC_DEV_ATTR(rca, "0x%04x\n", card->rca); + + +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); + /* return default DSR value */ + return sysfs_emit(buf, "0x%x\n", 0x404); +} + +static DEVICE_ATTR(dsr, S_IRUGO, mmc_dsr_show, NULL); + +MMC_DEV_ATTR(vendor, "0x%04x\n", card->cis.vendor); +MMC_DEV_ATTR(device, "0x%04x\n", card->cis.device); +MMC_DEV_ATTR(revision, "%u.%u\n", card->major_rev, card->minor_rev); + +#define sdio_info_attr(num) \ +static ssize_t info##num##_show(struct device *dev, struct device_attribute *attr, char *buf) \ +{ \ + struct mmc_card *card = mmc_dev_to_card(dev); \ + \ + if (num > card->num_info) \ + return -ENODATA; \ + if (!card->info[num - 1][0]) \ + return 0; \ + return sysfs_emit(buf, "%s\n", card->info[num - 1]); \ +} \ +static DEVICE_ATTR_RO(info##num) + +sdio_info_attr(1); +sdio_info_attr(2); +sdio_info_attr(3); +sdio_info_attr(4); + +static struct attribute *sd_std_attrs[] = { + &dev_attr_vendor.attr, + &dev_attr_device.attr, + &dev_attr_revision.attr, + &dev_attr_info1.attr, + &dev_attr_info2.attr, + &dev_attr_info3.attr, + &dev_attr_info4.attr, + &dev_attr_cid.attr, + &dev_attr_csd.attr, + &dev_attr_scr.attr, + &dev_attr_ssr.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_ocr.attr, + &dev_attr_rca.attr, + &dev_attr_dsr.attr, + NULL, +}; + +static umode_t sd_std_is_visible(struct kobject *kobj, struct attribute *attr, + int index) +{ + struct device *dev = kobj_to_dev(kobj); + struct mmc_card *card = mmc_dev_to_card(dev); + + /* CIS vendor and device ids, revision and info string are available only for Combo cards */ + if ((attr == &dev_attr_vendor.attr || + attr == &dev_attr_device.attr || + attr == &dev_attr_revision.attr || + attr == &dev_attr_info1.attr || + attr == &dev_attr_info2.attr || + attr == &dev_attr_info3.attr || + attr == &dev_attr_info4.attr + ) &&!mmc_card_sd_combo(card)) + return 0; + + return attr->mode; +} + +static const struct attribute_group sd_std_group = { + .attrs = sd_std_attrs, + .is_visible = sd_std_is_visible, +}; +__ATTRIBUTE_GROUPS(sd_std); + +struct device_type sd_type = { + .groups = sd_std_groups, +}; + +/* + * Fetch CID from card. + */ +int mmc_sd_get_cid(struct mmc_host *host, u32 ocr, u32 *cid, u32 *rocr) +{ + int err; + u32 max_current; + int retries = 10; + u32 pocr = ocr; + +try_again: + if (!retries) { + ocr &= ~SD_OCR_S18R; + pr_warn("%s: Skipping voltage switch\n", mmc_hostname(host)); + } + + /* + * 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(host); + + /* + * If SD_SEND_IF_COND indicates an SD 2.0 + * compliant card and we should set bit 30 + * of the ocr to indicate that we can handle + * block-addressed SDHC cards. + */ + err = mmc_send_if_cond(host, ocr); + if (!err) + ocr |= SD_OCR_CCS; + + /* + * If the host supports one of UHS-I modes, request the card + * to switch to 1.8V signaling level. If the card has failed + * repeatedly to switch however, skip this. + */ + if (retries && mmc_host_uhs(host)) + ocr |= SD_OCR_S18R; + + /* + * If the host can supply more than 150mA at current voltage, + * XPC should be set to 1. + */ + max_current = sd_get_host_max_current(host); + if (max_current > 150) + ocr |= SD_OCR_XPC; + + err = mmc_send_app_op_cond(host, ocr, rocr); + if (err) + return err; + + /* + * In case the S18A bit is set in the response, let's start the signal + * voltage switch procedure. SPI mode doesn't support CMD11. + * Note that, according to the spec, the S18A bit is not valid unless + * the CCS bit is set as well. We deliberately deviate from the spec in + * regards to this, which allows UHS-I to be supported for SDSC cards. + */ + if (!mmc_host_is_spi(host) && (ocr & SD_OCR_S18R) && + rocr && (*rocr & SD_ROCR_S18A)) { + err = mmc_set_uhs_voltage(host, pocr); + if (err == -EAGAIN) { + retries--; + goto try_again; + } else if (err) { + retries = 0; + goto try_again; + } + } + + err = mmc_send_cid(host, cid); + return err; +} + +int mmc_sd_get_csd(struct mmc_card *card) +{ + int err; + + /* + * Fetch CSD from card. + */ + err = mmc_send_csd(card, card->raw_csd); + if (err) + return err; + + err = mmc_decode_csd(card); + if (err) + return err; + + return 0; +} + +static int mmc_sd_get_ro(struct mmc_host *host) +{ + int ro; + + /* + * Some systems don't feature a write-protect pin and don't need one. + * E.g. because they only have micro-SD card slot. For those systems + * assume that the SD card is always read-write. + */ + if (host->caps2 & MMC_CAP2_NO_WRITE_PROTECT) + return 0; + + if (!host->ops->get_ro) + return -1; + + ro = host->ops->get_ro(host); + + return ro; +} + +int mmc_sd_setup_card(struct mmc_host *host, struct mmc_card *card, + bool reinit) +{ + int err; + + if (!reinit) { + /* + * Fetch SCR from card. + */ + err = mmc_app_send_scr(card); + if (err) + return err; + + err = mmc_decode_scr(card); + if (err) + return err; + + /* + * Fetch and process SD Status register. + */ + err = mmc_read_ssr(card); + if (err) + return err; + + /* Erase init depends on CSD and SSR */ + mmc_init_erase(card); + } + + /* + * Fetch switch information from card. Note, sd3_bus_mode can change if + * voltage switch outcome changes, so do this always. + */ + err = mmc_read_switch(card); + if (err) + return err; + + /* + * For SPI, enable CRC as appropriate. + * This CRC enable is located AFTER the reading of the + * card registers because some SDHC cards are not able + * to provide valid CRCs for non-512-byte blocks. + */ + if (mmc_host_is_spi(host)) { + err = mmc_spi_set_crc(host, use_spi_crc); + if (err) + return err; + } + + /* + * Check if read-only switch is active. + */ + if (!reinit) { + int ro = mmc_sd_get_ro(host); + + if (ro < 0) { + pr_warn("%s: host does not support reading read-only switch, assuming write-enable\n", + mmc_hostname(host)); + } else if (ro > 0) { + mmc_card_set_readonly(card); + } + } + + return 0; +} + +unsigned mmc_sd_get_max_clock(struct mmc_card *card) +{ + unsigned max_dtr = (unsigned int)-1; + + if (mmc_card_hs(card)) { + if (max_dtr > card->sw_caps.hs_max_dtr) + max_dtr = card->sw_caps.hs_max_dtr; + } else if (max_dtr > card->csd.max_dtr) { + max_dtr = card->csd.max_dtr; + } + + return max_dtr; +} + +static bool mmc_sd_card_using_v18(struct mmc_card *card) +{ + /* + * According to the SD spec., the Bus Speed Mode (function group 1) bits + * 2 to 4 are zero if the card is initialized at 3.3V signal level. Thus + * they can be used to determine if the card has already switched to + * 1.8V signaling. + */ + return card->sw_caps.sd3_bus_mode & + (SD_MODE_UHS_SDR50 | SD_MODE_UHS_SDR104 | SD_MODE_UHS_DDR50); +} + +static int sd_write_ext_reg(struct mmc_card *card, u8 fno, u8 page, u16 offset, + u8 reg_data) +{ + struct mmc_host *host = card->host; + struct mmc_request mrq = {}; + struct mmc_command cmd = {}; + struct mmc_data data = {}; + struct scatterlist sg; + u8 *reg_buf; + + reg_buf = kzalloc(512, GFP_KERNEL); + if (!reg_buf) + return -ENOMEM; + + mrq.cmd = &cmd; + mrq.data = &data; + + /* + * Arguments of CMD49: + * [31:31] MIO (0 = memory). + * [30:27] FNO (function number). + * [26:26] MW - mask write mode (0 = disable). + * [25:18] page number. + * [17:9] offset address. + * [8:0] length (0 = 1 byte). + */ + cmd.arg = fno << 27 | page << 18 | offset << 9; + + /* The first byte in the buffer is the data to be written. */ + reg_buf[0] = reg_data; + + data.flags = MMC_DATA_WRITE; + data.blksz = 512; + data.blocks = 1; + data.sg = &sg; + data.sg_len = 1; + sg_init_one(&sg, reg_buf, 512); + + cmd.opcode = SD_WRITE_EXTR_SINGLE; + cmd.flags = MMC_RSP_R1 | MMC_CMD_ADTC; + + mmc_set_data_timeout(&data, card); + mmc_wait_for_req(host, &mrq); + + kfree(reg_buf); + + /* + * Note that, the SD card is allowed to signal busy on DAT0 up to 1s + * after the CMD49. Although, let's leave this to be managed by the + * caller. + */ + + if (cmd.error) + return cmd.error; + if (data.error) + return data.error; + + return 0; +} + +static int sd_read_ext_reg(struct mmc_card *card, u8 fno, u8 page, + u16 offset, u16 len, u8 *reg_buf) +{ + u32 cmd_args; + + /* + * Command arguments of CMD48: + * [31:31] MIO (0 = memory). + * [30:27] FNO (function number). + * [26:26] reserved (0). + * [25:18] page number. + * [17:9] offset address. + * [8:0] length (0 = 1 byte, 1ff = 512 bytes). + */ + cmd_args = fno << 27 | page << 18 | offset << 9 | (len -1); + + return mmc_send_adtc_data(card, card->host, SD_READ_EXTR_SINGLE, + cmd_args, reg_buf, 512); +} + +static int sd_parse_ext_reg_power(struct mmc_card *card, u8 fno, u8 page, + u16 offset) +{ + int err; + u8 *reg_buf; + + reg_buf = kzalloc(512, GFP_KERNEL); + if (!reg_buf) + return -ENOMEM; + + /* Read the extension register for power management function. */ + err = sd_read_ext_reg(card, fno, page, offset, 512, reg_buf); + if (err) { + pr_warn("%s: error %d reading PM func of ext reg\n", + mmc_hostname(card->host), err); + goto out; + } + + /* PM revision consists of 4 bits. */ + card->ext_power.rev = reg_buf[0] & 0xf; + + /* Power Off Notification support at bit 4. */ + if (reg_buf[1] & BIT(4)) + card->ext_power.feature_support |= SD_EXT_POWER_OFF_NOTIFY; + + /* Power Sustenance support at bit 5. */ + if (reg_buf[1] & BIT(5)) + card->ext_power.feature_support |= SD_EXT_POWER_SUSTENANCE; + + /* Power Down Mode support at bit 6. */ + if (reg_buf[1] & BIT(6)) + card->ext_power.feature_support |= SD_EXT_POWER_DOWN_MODE; + + card->ext_power.fno = fno; + card->ext_power.page = page; + card->ext_power.offset = offset; + +out: + kfree(reg_buf); + return err; +} + +static int sd_parse_ext_reg_perf(struct mmc_card *card, u8 fno, u8 page, + u16 offset) +{ + int err; + u8 *reg_buf; + + reg_buf = kzalloc(512, GFP_KERNEL); + if (!reg_buf) + return -ENOMEM; + + err = sd_read_ext_reg(card, fno, page, offset, 512, reg_buf); + if (err) { + pr_warn("%s: error %d reading PERF func of ext reg\n", + mmc_hostname(card->host), err); + goto out; + } + + /* PERF revision. */ + card->ext_perf.rev = reg_buf[0]; + + /* FX_EVENT support at bit 0. */ + if (reg_buf[1] & BIT(0)) + card->ext_perf.feature_support |= SD_EXT_PERF_FX_EVENT; + + /* Card initiated self-maintenance support at bit 0. */ + if (reg_buf[2] & BIT(0)) + card->ext_perf.feature_support |= SD_EXT_PERF_CARD_MAINT; + + /* Host initiated self-maintenance support at bit 1. */ + if (reg_buf[2] & BIT(1)) + card->ext_perf.feature_support |= SD_EXT_PERF_HOST_MAINT; + + /* Cache support at bit 0. */ + if ((reg_buf[4] & BIT(0)) && !mmc_card_broken_sd_cache(card)) + card->ext_perf.feature_support |= SD_EXT_PERF_CACHE; + + /* Command queue support indicated via queue depth bits (0 to 4). */ + if (reg_buf[6] & 0x1f) + card->ext_perf.feature_support |= SD_EXT_PERF_CMD_QUEUE; + + card->ext_perf.fno = fno; + card->ext_perf.page = page; + card->ext_perf.offset = offset; + +out: + kfree(reg_buf); + return err; +} + +static int sd_parse_ext_reg(struct mmc_card *card, u8 *gen_info_buf, + u16 *next_ext_addr) +{ + u8 num_regs, fno, page; + u16 sfc, offset, ext = *next_ext_addr; + u32 reg_addr; + + /* + * Parse only one register set per extension, as that is sufficient to + * support the standard functions. This means another 48 bytes in the + * buffer must be available. + */ + if (ext + 48 > 512) + return -EFAULT; + + /* Standard Function Code */ + memcpy(&sfc, &gen_info_buf[ext], 2); + + /* Address to the next extension. */ + memcpy(next_ext_addr, &gen_info_buf[ext + 40], 2); + + /* Number of registers for this extension. */ + num_regs = gen_info_buf[ext + 42]; + + /* We support only one register per extension. */ + if (num_regs != 1) + return 0; + + /* Extension register address. */ + memcpy(®_addr, &gen_info_buf[ext + 44], 4); + + /* 9 bits (0 to 8) contains the offset address. */ + offset = reg_addr & 0x1ff; + + /* 8 bits (9 to 16) contains the page number. */ + page = reg_addr >> 9 & 0xff ; + + /* 4 bits (18 to 21) contains the function number. */ + fno = reg_addr >> 18 & 0xf; + + /* Standard Function Code for power management. */ + if (sfc == 0x1) + return sd_parse_ext_reg_power(card, fno, page, offset); + + /* Standard Function Code for performance enhancement. */ + if (sfc == 0x2) + return sd_parse_ext_reg_perf(card, fno, page, offset); + + return 0; +} + +static int sd_read_ext_regs(struct mmc_card *card) +{ + int err, i; + u8 num_ext, *gen_info_buf; + u16 rev, len, next_ext_addr; + + if (mmc_host_is_spi(card->host)) + return 0; + + if (!(card->scr.cmds & SD_SCR_CMD48_SUPPORT)) + return 0; + + gen_info_buf = kzalloc(512, GFP_KERNEL); + if (!gen_info_buf) + return -ENOMEM; + + /* + * Read 512 bytes of general info, which is found at function number 0, + * at page 0 and with no offset. + */ + err = sd_read_ext_reg(card, 0, 0, 0, 512, gen_info_buf); + if (err) { + pr_err("%s: error %d reading general info of SD ext reg\n", + mmc_hostname(card->host), err); + goto out; + } + + /* General info structure revision. */ + memcpy(&rev, &gen_info_buf[0], 2); + + /* Length of general info in bytes. */ + memcpy(&len, &gen_info_buf[2], 2); + + /* Number of extensions to be find. */ + num_ext = gen_info_buf[4]; + + /* + * We only support revision 0 and limit it to 512 bytes for simplicity. + * No matter what, let's return zero to allow us to continue using the + * card, even if we can't support the features from the SD function + * extensions registers. + */ + if (rev != 0 || len > 512) { + pr_warn("%s: non-supported SD ext reg layout\n", + mmc_hostname(card->host)); + goto out; + } + + /* + * Parse the extension registers. The first extension should start + * immediately after the general info header (16 bytes). + */ + next_ext_addr = 16; + for (i = 0; i < num_ext; i++) { + err = sd_parse_ext_reg(card, gen_info_buf, &next_ext_addr); + if (err) { + pr_err("%s: error %d parsing SD ext reg\n", + mmc_hostname(card->host), err); + goto out; + } + } + +out: + kfree(gen_info_buf); + return err; +} + +static bool sd_cache_enabled(struct mmc_host *host) +{ + return host->card->ext_perf.feature_enabled & SD_EXT_PERF_CACHE; +} + +static int sd_flush_cache(struct mmc_host *host) +{ + struct mmc_card *card = host->card; + u8 *reg_buf, fno, page; + u16 offset; + int err; + + if (!sd_cache_enabled(host)) + return 0; + + reg_buf = kzalloc(512, GFP_KERNEL); + if (!reg_buf) + return -ENOMEM; + + /* + * Set Flush Cache at bit 0 in the performance enhancement register at + * 261 bytes offset. + */ + fno = card->ext_perf.fno; + page = card->ext_perf.page; + offset = card->ext_perf.offset + 261; + + err = sd_write_ext_reg(card, fno, page, offset, BIT(0)); + if (err) { + pr_warn("%s: error %d writing Cache Flush bit\n", + mmc_hostname(host), err); + goto out; + } + + err = mmc_poll_for_busy(card, SD_WRITE_EXTR_SINGLE_TIMEOUT_MS, false, + MMC_BUSY_EXTR_SINGLE); + if (err) + goto out; + + /* + * Read the Flush Cache bit. The card shall reset it, to confirm that + * it's has completed the flushing of the cache. + */ + err = sd_read_ext_reg(card, fno, page, offset, 1, reg_buf); + if (err) { + pr_warn("%s: error %d reading Cache Flush bit\n", + mmc_hostname(host), err); + goto out; + } + + if (reg_buf[0] & BIT(0)) + err = -ETIMEDOUT; +out: + kfree(reg_buf); + return err; +} + +static int sd_enable_cache(struct mmc_card *card) +{ + u8 *reg_buf; + int err; + + card->ext_perf.feature_enabled &= ~SD_EXT_PERF_CACHE; + + reg_buf = kzalloc(512, GFP_KERNEL); + if (!reg_buf) + return -ENOMEM; + + /* + * Set Cache Enable at bit 0 in the performance enhancement register at + * 260 bytes offset. + */ + err = sd_write_ext_reg(card, card->ext_perf.fno, card->ext_perf.page, + card->ext_perf.offset + 260, BIT(0)); + if (err) { + pr_warn("%s: error %d writing Cache Enable bit\n", + mmc_hostname(card->host), err); + goto out; + } + + err = mmc_poll_for_busy(card, SD_WRITE_EXTR_SINGLE_TIMEOUT_MS, false, + MMC_BUSY_EXTR_SINGLE); + if (!err) + card->ext_perf.feature_enabled |= SD_EXT_PERF_CACHE; + +out: + kfree(reg_buf); + 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_sd_init_card(struct mmc_host *host, u32 ocr, + struct mmc_card *oldcard) +{ + struct mmc_card *card; + int err; + u32 cid[4]; + u32 rocr = 0; + bool v18_fixup_failed = false; + + WARN_ON(!host->claimed); +retry: + err = mmc_sd_get_cid(host, ocr, cid, &rocr); + if (err) + return err; + + if (oldcard) { + if (memcmp(cid, oldcard->raw_cid, sizeof(cid)) != 0) { + pr_debug("%s: Perhaps the card was replaced\n", + mmc_hostname(host)); + return -ENOENT; + } + + card = oldcard; + } else { + /* + * Allocate card structure. + */ + card = mmc_alloc_card(host, &sd_type); + if (IS_ERR(card)) + return PTR_ERR(card); + + card->ocr = ocr; + card->type = MMC_TYPE_SD; + 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: get card RCA and quit open drain mode. + */ + if (!mmc_host_is_spi(host)) { + err = mmc_send_relative_addr(host, &card->rca); + if (err) + goto free_card; + } + + if (!oldcard) { + err = mmc_sd_get_csd(card); + if (err) + goto free_card; + + mmc_decode_cid(card); + } + + /* + * 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)) { + err = mmc_select_card(card); + if (err) + goto free_card; + } + + err = mmc_sd_setup_card(host, card, oldcard != NULL); + if (err) + goto free_card; + + /* + * If the card has not been power cycled, it may still be using 1.8V + * signaling. Detect that situation and try to initialize a UHS-I (1.8V) + * transfer mode. + */ + if (!v18_fixup_failed && !mmc_host_is_spi(host) && mmc_host_uhs(host) && + mmc_sd_card_using_v18(card) && + host->ios.signal_voltage != MMC_SIGNAL_VOLTAGE_180) { + if (mmc_host_set_uhs_voltage(host) || + mmc_sd_init_uhs_card(card)) { + v18_fixup_failed = true; + mmc_power_cycle(host, ocr); + if (!oldcard) + mmc_remove_card(card); + goto retry; + } + goto cont; + } + + /* Initialization sequence for UHS-I cards */ + if (rocr & SD_ROCR_S18A && mmc_host_uhs(host)) { + err = mmc_sd_init_uhs_card(card); + if (err) + goto free_card; + } else { + /* + * Attempt to change to high-speed (if supported) + */ + err = mmc_sd_switch_hs(card); + if (err > 0) + mmc_set_timing(card->host, MMC_TIMING_SD_HS); + else if (err) + goto free_card; + + /* + * Set bus speed. + */ + mmc_set_clock(host, mmc_sd_get_max_clock(card)); + + /* + * Switch to wider bus (if supported). + */ + if ((host->caps & MMC_CAP_4_BIT_DATA) && + (card->scr.bus_widths & SD_SCR_BUS_WIDTH_4)) { + err = mmc_app_set_bus_width(card, MMC_BUS_WIDTH_4); + if (err) + goto free_card; + + mmc_set_bus_width(host, MMC_BUS_WIDTH_4); + } + } +cont: + if (!oldcard) { + /* Read/parse the extension registers. */ + err = sd_read_ext_regs(card); + if (err) + goto free_card; + } + + /* Enable internal SD cache if supported. */ + if (card->ext_perf.feature_support & SD_EXT_PERF_CACHE) { + err = sd_enable_cache(card); + if (err) + goto free_card; + } + + if (host->cqe_ops && !host->cqe_enabled) { + err = host->cqe_ops->cqe_enable(host, card); + if (!err) { + host->cqe_enabled = true; + 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; + } + + host->card = card; + return 0; + +free_card: + if (!oldcard) + mmc_remove_card(card); + + return err; +} + +/* + * Host is being removed. Free up the current card. + */ +static void mmc_sd_remove(struct mmc_host *host) +{ + mmc_remove_card(host->card); + host->card = NULL; +} + +/* + * Card detection - card is alive. + */ +static int mmc_sd_alive(struct mmc_host *host) +{ + return mmc_send_status(host->card, NULL); +} + +/* + * Card detection callback from host. + */ +static void mmc_sd_detect(struct mmc_host *host) +{ + int err; + + 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, NULL); + + if (err) { + mmc_sd_remove(host); + + mmc_claim_host(host); + mmc_detach_bus(host); + mmc_power_off(host); + mmc_release_host(host); + } +} + +static int sd_can_poweroff_notify(struct mmc_card *card) +{ + return card->ext_power.feature_support & SD_EXT_POWER_OFF_NOTIFY; +} + +static int sd_busy_poweroff_notify_cb(void *cb_data, bool *busy) +{ + struct sd_busy_data *data = cb_data; + struct mmc_card *card = data->card; + int err; + + /* + * Read the status register for the power management function. It's at + * one byte offset and is one byte long. The Power Off Notification + * Ready is bit 0. + */ + err = sd_read_ext_reg(card, card->ext_power.fno, card->ext_power.page, + card->ext_power.offset + 1, 1, data->reg_buf); + if (err) { + pr_warn("%s: error %d reading status reg of PM func\n", + mmc_hostname(card->host), err); + return err; + } + + *busy = !(data->reg_buf[0] & BIT(0)); + return 0; +} + +static int sd_poweroff_notify(struct mmc_card *card) +{ + struct sd_busy_data cb_data; + u8 *reg_buf; + int err; + + reg_buf = kzalloc(512, GFP_KERNEL); + if (!reg_buf) + return -ENOMEM; + + /* + * Set the Power Off Notification bit in the power management settings + * register at 2 bytes offset. + */ + err = sd_write_ext_reg(card, card->ext_power.fno, card->ext_power.page, + card->ext_power.offset + 2, BIT(0)); + if (err) { + pr_warn("%s: error %d writing Power Off Notify bit\n", + mmc_hostname(card->host), err); + goto out; + } + + /* Find out when the command is completed. */ + err = mmc_poll_for_busy(card, SD_WRITE_EXTR_SINGLE_TIMEOUT_MS, false, + MMC_BUSY_EXTR_SINGLE); + if (err) + goto out; + + cb_data.card = card; + cb_data.reg_buf = reg_buf; + err = __mmc_poll_for_busy(card->host, 0, SD_POWEROFF_NOTIFY_TIMEOUT_MS, + &sd_busy_poweroff_notify_cb, &cb_data); + +out: + kfree(reg_buf); + return err; +} + +static int _mmc_sd_suspend(struct mmc_host *host) +{ + struct mmc_card *card = host->card; + int err = 0; + + mmc_claim_host(host); + + if (mmc_card_suspended(card)) + goto out; + + if (sd_can_poweroff_notify(card)) + err = sd_poweroff_notify(card); + else if (!mmc_host_is_spi(host)) + err = mmc_deselect_cards(host); + + if (!err) { + mmc_power_off(host); + mmc_card_set_suspended(card); + } + +out: + mmc_release_host(host); + return err; +} + +/* + * Callback for suspend + */ +static int mmc_sd_suspend(struct mmc_host *host) +{ + int err; + + err = _mmc_sd_suspend(host); + if (!err) { + pm_runtime_disable(&host->card->dev); + pm_runtime_set_suspended(&host->card->dev); + } + + return err; +} + +/* + * This function tries to determine if the same card is still present + * and, if so, restore all state to it. + */ +static int _mmc_sd_resume(struct mmc_host *host) +{ + int err = 0; + + mmc_claim_host(host); + + if (!mmc_card_suspended(host->card)) + goto out; + + mmc_power_up(host, host->card->ocr); + err = mmc_sd_init_card(host, host->card->ocr, host->card); + mmc_card_clr_suspended(host->card); + +out: + mmc_release_host(host); + return err; +} + +/* + * Callback for resume + */ +static int mmc_sd_resume(struct mmc_host *host) +{ + pm_runtime_enable(&host->card->dev); + return 0; +} + +/* + * Callback for runtime_suspend. + */ +static int mmc_sd_runtime_suspend(struct mmc_host *host) +{ + int err; + + if (!(host->caps & MMC_CAP_AGGRESSIVE_PM)) + return 0; + + err = _mmc_sd_suspend(host); + if (err) + pr_err("%s: error %d doing aggressive suspend\n", + mmc_hostname(host), err); + + return err; +} + +/* + * Callback for runtime_resume. + */ +static int mmc_sd_runtime_resume(struct mmc_host *host) +{ + int err; + + err = _mmc_sd_resume(host); + if (err && err != -ENOMEDIUM) + pr_err("%s: error %d doing runtime resume\n", + mmc_hostname(host), err); + + return 0; +} + +static int mmc_sd_hw_reset(struct mmc_host *host) +{ + mmc_power_cycle(host, host->card->ocr); + return mmc_sd_init_card(host, host->card->ocr, host->card); +} + +static const struct mmc_bus_ops mmc_sd_ops = { + .remove = mmc_sd_remove, + .detect = mmc_sd_detect, + .runtime_suspend = mmc_sd_runtime_suspend, + .runtime_resume = mmc_sd_runtime_resume, + .suspend = mmc_sd_suspend, + .resume = mmc_sd_resume, + .alive = mmc_sd_alive, + .shutdown = mmc_sd_suspend, + .hw_reset = mmc_sd_hw_reset, + .cache_enabled = sd_cache_enabled, + .flush_cache = sd_flush_cache, +}; + +/* + * Starting point for SD card init. + */ +int mmc_attach_sd(struct mmc_host *host) +{ + int err; + u32 ocr, rocr; + + WARN_ON(!host->claimed); + + err = mmc_send_app_op_cond(host, 0, &ocr); + if (err) + return err; + + mmc_attach_bus(host, &mmc_sd_ops); + if (host->ocr_avail_sd) + host->ocr_avail = host->ocr_avail_sd; + + /* + * We need to get OCR a different way for SPI. + */ + if (mmc_host_is_spi(host)) { + mmc_go_idle(host); + + err = mmc_spi_read_ocr(host, 0, &ocr); + if (err) + goto err; + } + + /* + * Some SD cards claims an out of spec VDD voltage range. Let's treat + * these bits as being in-valid and especially also bit7. + */ + ocr &= ~0x7FFF; + + rocr = mmc_select_voltage(host, ocr); + + /* + * Can we support the voltage(s) of the card(s)? + */ + if (!rocr) { + err = -EINVAL; + goto err; + } + + /* + * Detect and init the card. + */ + err = mmc_sd_init_card(host, rocr, NULL); + if (err) + goto err; + + mmc_release_host(host); + err = mmc_add_card(host->card); + if (err) + goto remove_card; + + mmc_claim_host(host); + return 0; + +remove_card: + mmc_remove_card(host->card); + host->card = NULL; + mmc_claim_host(host); +err: + mmc_detach_bus(host); + + pr_err("%s: error %d whilst initialising SD card\n", + mmc_hostname(host), err); + + return err; +} |