diff options
Diffstat (limited to 'drivers/mmc/core/sdio.c')
| -rw-r--r-- | drivers/mmc/core/sdio.c | 1224 |
1 files changed, 1224 insertions, 0 deletions
diff --git a/drivers/mmc/core/sdio.c b/drivers/mmc/core/sdio.c new file mode 100644 index 000000000..5f1ee88aa --- /dev/null +++ b/drivers/mmc/core/sdio.c @@ -0,0 +1,1224 @@ +/* + * linux/drivers/mmc/sdio.c + * + * Copyright 2006-2007 Pierre Ossman + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or (at + * your option) any later version. + */ + +#include <linux/err.h> +#include <linux/pm_runtime.h> + +#include <linux/mmc/host.h> +#include <linux/mmc/card.h> +#include <linux/mmc/mmc.h> +#include <linux/mmc/sdio.h> +#include <linux/mmc/sdio_func.h> +#include <linux/mmc/sdio_ids.h> + +#include "core.h" +#include "card.h" +#include "host.h" +#include "bus.h" +#include "quirks.h" +#include "sd.h" +#include "sdio_bus.h" +#include "mmc_ops.h" +#include "sd_ops.h" +#include "sdio_ops.h" +#include "sdio_cis.h" + +static int sdio_read_fbr(struct sdio_func *func) +{ + int ret; + unsigned char data; + + if (mmc_card_nonstd_func_interface(func->card)) { + func->class = SDIO_CLASS_NONE; + return 0; + } + + ret = mmc_io_rw_direct(func->card, 0, 0, + SDIO_FBR_BASE(func->num) + SDIO_FBR_STD_IF, 0, &data); + if (ret) + goto out; + + data &= 0x0f; + + if (data == 0x0f) { + ret = mmc_io_rw_direct(func->card, 0, 0, + SDIO_FBR_BASE(func->num) + SDIO_FBR_STD_IF_EXT, 0, &data); + if (ret) + goto out; + } + + func->class = data; + +out: + return ret; +} + +static int sdio_init_func(struct mmc_card *card, unsigned int fn) +{ + int ret; + struct sdio_func *func; + + if (WARN_ON(fn > SDIO_MAX_FUNCS)) + return -EINVAL; + + func = sdio_alloc_func(card); + if (IS_ERR(func)) + return PTR_ERR(func); + + func->num = fn; + + if (!(card->quirks & MMC_QUIRK_NONSTD_SDIO)) { + ret = sdio_read_fbr(func); + if (ret) + goto fail; + + ret = sdio_read_func_cis(func); + if (ret) + goto fail; + } else { + func->vendor = func->card->cis.vendor; + func->device = func->card->cis.device; + func->max_blksize = func->card->cis.blksize; + } + + card->sdio_func[fn - 1] = func; + + return 0; + +fail: + /* + * It is okay to remove the function here even though we hold + * the host lock as we haven't registered the device yet. + */ + sdio_remove_func(func); + return ret; +} + +static int sdio_read_cccr(struct mmc_card *card, u32 ocr) +{ + int ret; + int cccr_vsn; + int uhs = ocr & R4_18V_PRESENT; + unsigned char data; + unsigned char speed; + + ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_CCCR, 0, &data); + if (ret) + goto out; + + cccr_vsn = data & 0x0f; + + if (cccr_vsn > SDIO_CCCR_REV_3_00) { + pr_err("%s: unrecognised CCCR structure version %d\n", + mmc_hostname(card->host), cccr_vsn); + return -EINVAL; + } + + card->cccr.sdio_vsn = (data & 0xf0) >> 4; + + ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_CAPS, 0, &data); + if (ret) + goto out; + + if (data & SDIO_CCCR_CAP_SMB) + card->cccr.multi_block = 1; + if (data & SDIO_CCCR_CAP_LSC) + card->cccr.low_speed = 1; + if (data & SDIO_CCCR_CAP_4BLS) + card->cccr.wide_bus = 1; + + if (cccr_vsn >= SDIO_CCCR_REV_1_10) { + ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_POWER, 0, &data); + if (ret) + goto out; + + if (data & SDIO_POWER_SMPC) + card->cccr.high_power = 1; + } + + if (cccr_vsn >= SDIO_CCCR_REV_1_20) { + ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_SPEED, 0, &speed); + if (ret) + goto out; + + card->scr.sda_spec3 = 0; + card->sw_caps.sd3_bus_mode = 0; + card->sw_caps.sd3_drv_type = 0; + if (cccr_vsn >= SDIO_CCCR_REV_3_00 && uhs) { + card->scr.sda_spec3 = 1; + ret = mmc_io_rw_direct(card, 0, 0, + SDIO_CCCR_UHS, 0, &data); + if (ret) + goto out; + + if (mmc_host_uhs(card->host)) { + if (data & SDIO_UHS_DDR50) + card->sw_caps.sd3_bus_mode + |= SD_MODE_UHS_DDR50; + + if (data & SDIO_UHS_SDR50) + card->sw_caps.sd3_bus_mode + |= SD_MODE_UHS_SDR50; + + if (data & SDIO_UHS_SDR104) + card->sw_caps.sd3_bus_mode + |= SD_MODE_UHS_SDR104; + } + + ret = mmc_io_rw_direct(card, 0, 0, + SDIO_CCCR_DRIVE_STRENGTH, 0, &data); + if (ret) + goto out; + + if (data & SDIO_DRIVE_SDTA) + card->sw_caps.sd3_drv_type |= SD_DRIVER_TYPE_A; + if (data & SDIO_DRIVE_SDTC) + card->sw_caps.sd3_drv_type |= SD_DRIVER_TYPE_C; + if (data & SDIO_DRIVE_SDTD) + card->sw_caps.sd3_drv_type |= SD_DRIVER_TYPE_D; + } + + /* if no uhs mode ensure we check for high speed */ + if (!card->sw_caps.sd3_bus_mode) { + if (speed & SDIO_SPEED_SHS) { + card->cccr.high_speed = 1; + card->sw_caps.hs_max_dtr = 50000000; + } else { + card->cccr.high_speed = 0; + card->sw_caps.hs_max_dtr = 25000000; + } + } + } + +out: + return ret; +} + +static int sdio_enable_wide(struct mmc_card *card) +{ + int ret; + u8 ctrl; + + if (!(card->host->caps & MMC_CAP_4_BIT_DATA)) + return 0; + + if (card->cccr.low_speed && !card->cccr.wide_bus) + return 0; + + ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_IF, 0, &ctrl); + if (ret) + return ret; + + if ((ctrl & SDIO_BUS_WIDTH_MASK) == SDIO_BUS_WIDTH_RESERVED) + pr_warn("%s: SDIO_CCCR_IF is invalid: 0x%02x\n", + mmc_hostname(card->host), ctrl); + + /* set as 4-bit bus width */ + ctrl &= ~SDIO_BUS_WIDTH_MASK; + ctrl |= SDIO_BUS_WIDTH_4BIT; + + ret = mmc_io_rw_direct(card, 1, 0, SDIO_CCCR_IF, ctrl, NULL); + if (ret) + return ret; + + return 1; +} + +/* + * If desired, disconnect the pull-up resistor on CD/DAT[3] (pin 1) + * of the card. This may be required on certain setups of boards, + * controllers and embedded sdio device which do not need the card's + * pull-up. As a result, card detection is disabled and power is saved. + */ +static int sdio_disable_cd(struct mmc_card *card) +{ + int ret; + u8 ctrl; + + if (!mmc_card_disable_cd(card)) + return 0; + + ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_IF, 0, &ctrl); + if (ret) + return ret; + + ctrl |= SDIO_BUS_CD_DISABLE; + + return mmc_io_rw_direct(card, 1, 0, SDIO_CCCR_IF, ctrl, NULL); +} + +/* + * Devices that remain active during a system suspend are + * put back into 1-bit mode. + */ +static int sdio_disable_wide(struct mmc_card *card) +{ + int ret; + u8 ctrl; + + if (!(card->host->caps & MMC_CAP_4_BIT_DATA)) + return 0; + + if (card->cccr.low_speed && !card->cccr.wide_bus) + return 0; + + ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_IF, 0, &ctrl); + if (ret) + return ret; + + if (!(ctrl & SDIO_BUS_WIDTH_4BIT)) + return 0; + + ctrl &= ~SDIO_BUS_WIDTH_4BIT; + ctrl |= SDIO_BUS_ASYNC_INT; + + ret = mmc_io_rw_direct(card, 1, 0, SDIO_CCCR_IF, ctrl, NULL); + if (ret) + return ret; + + mmc_set_bus_width(card->host, MMC_BUS_WIDTH_1); + + return 0; +} + + +static int sdio_enable_4bit_bus(struct mmc_card *card) +{ + int err; + + if (card->type == MMC_TYPE_SDIO) + err = sdio_enable_wide(card); + else if ((card->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) + return err; + err = sdio_enable_wide(card); + if (err <= 0) + mmc_app_set_bus_width(card, MMC_BUS_WIDTH_1); + } else + return 0; + + if (err > 0) { + mmc_set_bus_width(card->host, MMC_BUS_WIDTH_4); + err = 0; + } + + return err; +} + + +/* + * Test if the card supports high-speed mode and, if so, switch to it. + */ +static int mmc_sdio_switch_hs(struct mmc_card *card, int enable) +{ + int ret; + u8 speed; + + if (!(card->host->caps & MMC_CAP_SD_HIGHSPEED)) + return 0; + + if (!card->cccr.high_speed) + return 0; + + ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_SPEED, 0, &speed); + if (ret) + return ret; + + if (enable) + speed |= SDIO_SPEED_EHS; + else + speed &= ~SDIO_SPEED_EHS; + + ret = mmc_io_rw_direct(card, 1, 0, SDIO_CCCR_SPEED, speed, NULL); + if (ret) + return ret; + + return 1; +} + +/* + * Enable SDIO/combo card's high-speed mode. Return 0/1 if [not]supported. + */ +static int sdio_enable_hs(struct mmc_card *card) +{ + int ret; + + ret = mmc_sdio_switch_hs(card, true); + if (ret <= 0 || card->type == MMC_TYPE_SDIO) + return ret; + + ret = mmc_sd_switch_hs(card); + if (ret <= 0) + mmc_sdio_switch_hs(card, false); + + return ret; +} + +static unsigned mmc_sdio_get_max_clock(struct mmc_card *card) +{ + unsigned max_dtr; + + if (mmc_card_hs(card)) { + /* + * The SDIO specification doesn't mention how + * the CIS transfer speed register relates to + * high-speed, but it seems that 50 MHz is + * mandatory. + */ + max_dtr = 50000000; + } else { + max_dtr = card->cis.max_dtr; + } + + if (card->type == MMC_TYPE_SD_COMBO) + max_dtr = min(max_dtr, mmc_sd_get_max_clock(card)); + + return max_dtr; +} + +static unsigned char host_drive_to_sdio_drive(int host_strength) +{ + switch (host_strength) { + case MMC_SET_DRIVER_TYPE_A: + return SDIO_DTSx_SET_TYPE_A; + case MMC_SET_DRIVER_TYPE_B: + return SDIO_DTSx_SET_TYPE_B; + case MMC_SET_DRIVER_TYPE_C: + return SDIO_DTSx_SET_TYPE_C; + case MMC_SET_DRIVER_TYPE_D: + return SDIO_DTSx_SET_TYPE_D; + default: + return SDIO_DTSx_SET_TYPE_B; + } +} + +static void sdio_select_driver_type(struct mmc_card *card) +{ + int card_drv_type, drive_strength, drv_type; + unsigned char card_strength; + 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) { + /* if error just use default for drive strength B */ + err = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_DRIVE_STRENGTH, 0, + &card_strength); + if (err) + return; + + card_strength &= ~(SDIO_DRIVE_DTSx_MASK<<SDIO_DRIVE_DTSx_SHIFT); + card_strength |= host_drive_to_sdio_drive(drive_strength); + + /* if error default to drive strength B */ + err = mmc_io_rw_direct(card, 1, 0, SDIO_CCCR_DRIVE_STRENGTH, + card_strength, NULL); + if (err) + return; + card->drive_strength = drive_strength; + } + + if (drv_type) + mmc_set_driver_type(card->host, drv_type); +} + + +static int sdio_set_bus_speed_mode(struct mmc_card *card) +{ + unsigned int bus_speed, timing; + int err; + unsigned char speed; + unsigned int max_rate; + + /* + * If the host doesn't support any of the UHS-I modes, fallback on + * default speed. + */ + if (!mmc_host_uhs(card->host)) + return 0; + + bus_speed = SDIO_SPEED_SDR12; + timing = MMC_TIMING_UHS_SDR12; + if ((card->host->caps & MMC_CAP_UHS_SDR104) && + (card->sw_caps.sd3_bus_mode & SD_MODE_UHS_SDR104)) { + bus_speed = SDIO_SPEED_SDR104; + timing = MMC_TIMING_UHS_SDR104; + card->sw_caps.uhs_max_dtr = UHS_SDR104_MAX_DTR; + 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)) { + bus_speed = SDIO_SPEED_DDR50; + timing = MMC_TIMING_UHS_DDR50; + card->sw_caps.uhs_max_dtr = UHS_DDR50_MAX_DTR; + 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)) { + bus_speed = SDIO_SPEED_SDR50; + timing = MMC_TIMING_UHS_SDR50; + card->sw_caps.uhs_max_dtr = UHS_SDR50_MAX_DTR; + 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)) { + bus_speed = SDIO_SPEED_SDR25; + timing = MMC_TIMING_UHS_SDR25; + card->sw_caps.uhs_max_dtr = UHS_SDR25_MAX_DTR; + 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)) { + bus_speed = SDIO_SPEED_SDR12; + timing = MMC_TIMING_UHS_SDR12; + card->sw_caps.uhs_max_dtr = UHS_SDR12_MAX_DTR; + card->sd_bus_speed = UHS_SDR12_BUS_SPEED; + } + + err = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_SPEED, 0, &speed); + if (err) + return err; + + speed &= ~SDIO_SPEED_BSS_MASK; + speed |= bus_speed; + err = mmc_io_rw_direct(card, 1, 0, SDIO_CCCR_SPEED, speed, NULL); + if (err) + return err; + + max_rate = min_not_zero(card->quirk_max_rate, + card->sw_caps.uhs_max_dtr); + + if (bus_speed) { + mmc_set_timing(card->host, timing); + mmc_set_clock(card->host, max_rate); + } + + return 0; +} + +/* + * UHS-I specific initialization procedure + */ +static int mmc_sdio_init_uhs_card(struct mmc_card *card) +{ + int err; + + if (!card->scr.sda_spec3) + return 0; + + /* Switch to wider bus */ + err = sdio_enable_4bit_bus(card); + if (err) + goto out; + + /* Set the driver strength for the card */ + sdio_select_driver_type(card); + + /* Set bus speed mode of the card */ + err = sdio_set_bus_speed_mode(card); + 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_SDR104))) + err = mmc_execute_tuning(card); +out: + return err; +} + +static void mmc_sdio_resend_if_cond(struct mmc_host *host, + struct mmc_card *card) +{ + sdio_reset(host); + mmc_go_idle(host); + mmc_send_if_cond(host, host->ocr_avail); + mmc_remove_card(card); +} + +/* + * 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_sdio_init_card(struct mmc_host *host, u32 ocr, + struct mmc_card *oldcard, int powered_resume) +{ + struct mmc_card *card; + int err; + int retries = 10; + u32 rocr = 0; + u32 ocr_card = ocr; + + WARN_ON(!host->claimed); + + /* to query card if 1.8V signalling is supported */ + if (mmc_host_uhs(host)) + ocr |= R4_18V_PRESENT; + +try_again: + if (!retries) { + pr_warn("%s: Skipping voltage switch\n", mmc_hostname(host)); + ocr &= ~R4_18V_PRESENT; + } + + /* + * Inform the card of the voltage + */ + if (!powered_resume) { + err = mmc_send_io_op_cond(host, ocr, &rocr); + if (err) + goto err; + } + + /* + * For SPI, enable CRC as appropriate. + */ + if (mmc_host_is_spi(host)) { + err = mmc_spi_set_crc(host, use_spi_crc); + if (err) + goto err; + } + + /* + * Allocate card structure. + */ + card = mmc_alloc_card(host, NULL); + if (IS_ERR(card)) { + err = PTR_ERR(card); + goto err; + } + + if ((rocr & R4_MEMORY_PRESENT) && + mmc_sd_get_cid(host, ocr & rocr, card->raw_cid, NULL) == 0) { + card->type = MMC_TYPE_SD_COMBO; + + if (oldcard && (oldcard->type != MMC_TYPE_SD_COMBO || + memcmp(card->raw_cid, oldcard->raw_cid, sizeof(card->raw_cid)) != 0)) { + mmc_remove_card(card); + return -ENOENT; + } + } else { + card->type = MMC_TYPE_SDIO; + + if (oldcard && oldcard->type != MMC_TYPE_SDIO) { + mmc_remove_card(card); + return -ENOENT; + } + } + + /* + * Call the optional HC's init_card function to handle quirks. + */ + if (host->ops->init_card) + host->ops->init_card(host, card); + + card->ocr = ocr_card; + + /* + * If the host and card support UHS-I mode request the card + * to switch to 1.8V signaling level. No 1.8v signalling if + * UHS mode is not enabled to maintain compatibility and some + * systems that claim 1.8v signalling in fact do not support + * it. Per SDIO spec v3, section 3.1.2, if the voltage is already + * 1.8v, the card sets S18A to 0 in the R4 response. So it will + * fails to check rocr & R4_18V_PRESENT, but we still need to + * try to init uhs card. sdio_read_cccr will take over this task + * to make sure which speed mode should work. + */ + if (!powered_resume && (rocr & ocr & R4_18V_PRESENT)) { + err = mmc_set_uhs_voltage(host, ocr_card); + if (err == -EAGAIN) { + mmc_sdio_resend_if_cond(host, card); + retries--; + goto try_again; + } else if (err) { + ocr &= ~R4_18V_PRESENT; + } + } + + /* + * For native busses: set card RCA and quit open drain mode. + */ + if (!powered_resume && !mmc_host_is_spi(host)) { + err = mmc_send_relative_addr(host, &card->rca); + if (err) + goto remove; + + /* + * Update oldcard with the new RCA received from the SDIO + * device -- we're doing this so that it's updated in the + * "card" struct when oldcard overwrites that later. + */ + if (oldcard) + oldcard->rca = card->rca; + } + + /* + * Read CSD, before selecting the card + */ + if (!oldcard && card->type == MMC_TYPE_SD_COMBO) { + err = mmc_sd_get_csd(host, card); + if (err) + return err; + + mmc_decode_cid(card); + } + + /* + * Select card, as all following commands rely on that. + */ + if (!powered_resume && !mmc_host_is_spi(host)) { + err = mmc_select_card(card); + if (err) + goto remove; + } + + if (card->quirks & MMC_QUIRK_NONSTD_SDIO) { + /* + * This is non-standard SDIO device, meaning it doesn't + * have any CIA (Common I/O area) registers present. + * It's host's responsibility to fill cccr and cis + * structures in init_card(). + */ + mmc_set_clock(host, card->cis.max_dtr); + + if (card->cccr.high_speed) { + mmc_set_timing(card->host, MMC_TIMING_SD_HS); + } + + goto finish; + } + + /* + * Read the common registers. Note that we should try to + * validate whether UHS would work or not. + */ + err = sdio_read_cccr(card, ocr); + if (err) { + mmc_sdio_resend_if_cond(host, card); + if (ocr & R4_18V_PRESENT) { + /* Retry init sequence, but without R4_18V_PRESENT. */ + retries = 0; + goto try_again; + } + return err; + } + + /* + * Read the common CIS tuples. + */ + err = sdio_read_common_cis(card); + if (err) + goto remove; + + if (oldcard) { + int same = (card->cis.vendor == oldcard->cis.vendor && + card->cis.device == oldcard->cis.device); + mmc_remove_card(card); + if (!same) + return -ENOENT; + + card = oldcard; + } + + mmc_fixup_device(card, sdio_fixup_methods); + + if (card->type == MMC_TYPE_SD_COMBO) { + err = mmc_sd_setup_card(host, card, oldcard != NULL); + /* handle as SDIO-only card if memory init failed */ + if (err) { + mmc_go_idle(host); + if (mmc_host_is_spi(host)) + /* should not fail, as it worked previously */ + mmc_spi_set_crc(host, use_spi_crc); + card->type = MMC_TYPE_SDIO; + } else + card->dev.type = &sd_type; + } + + /* + * If needed, disconnect card detection pull-up resistor. + */ + err = sdio_disable_cd(card); + if (err) + goto remove; + + /* Initialization sequence for UHS-I cards */ + /* Only if card supports 1.8v and UHS signaling */ + if ((ocr & R4_18V_PRESENT) && card->sw_caps.sd3_bus_mode) { + err = mmc_sdio_init_uhs_card(card); + if (err) + goto remove; + } else { + /* + * Switch to high-speed (if supported). + */ + err = sdio_enable_hs(card); + if (err > 0) + mmc_set_timing(card->host, MMC_TIMING_SD_HS); + else if (err) + goto remove; + + /* + * Change to the card's maximum speed. + */ + mmc_set_clock(host, mmc_sdio_get_max_clock(card)); + + /* + * Switch to wider bus (if supported). + */ + err = sdio_enable_4bit_bus(card); + if (err) + goto remove; + } + + 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 remove; + } +finish: + if (!oldcard) + host->card = card; + return 0; + +remove: + if (!oldcard) + mmc_remove_card(card); + +err: + return err; +} + +static int mmc_sdio_reinit_card(struct mmc_host *host, bool powered_resume) +{ + int ret; + + sdio_reset(host); + mmc_go_idle(host); + mmc_send_if_cond(host, host->card->ocr); + + ret = mmc_send_io_op_cond(host, 0, NULL); + if (ret) + return ret; + + return mmc_sdio_init_card(host, host->card->ocr, host->card, + powered_resume); +} + +/* + * Host is being removed. Free up the current card. + */ +static void mmc_sdio_remove(struct mmc_host *host) +{ + int i; + + for (i = 0;i < host->card->sdio_funcs;i++) { + if (host->card->sdio_func[i]) { + sdio_remove_func(host->card->sdio_func[i]); + host->card->sdio_func[i] = NULL; + } + } + + mmc_remove_card(host->card); + host->card = NULL; +} + +/* + * Card detection - card is alive. + */ +static int mmc_sdio_alive(struct mmc_host *host) +{ + return mmc_select_card(host->card); +} + +/* + * Card detection callback from host. + */ +static void mmc_sdio_detect(struct mmc_host *host) +{ + int err; + + /* Make sure card is powered before detecting it */ + if (host->caps & MMC_CAP_POWER_OFF_CARD) { + err = pm_runtime_get_sync(&host->card->dev); + if (err < 0) { + pm_runtime_put_noidle(&host->card->dev); + goto out; + } + } + + mmc_claim_host(host); + + /* + * Just check if our card has been removed. + */ + err = _mmc_detect_card_removed(host); + + mmc_release_host(host); + + /* + * Tell PM core it's OK to power off the card now. + * + * The _sync variant is used in order to ensure that the card + * is left powered off in case an error occurred, and the card + * is going to be removed. + * + * Since there is no specific reason to believe a new user + * is about to show up at this point, the _sync variant is + * desirable anyway. + */ + if (host->caps & MMC_CAP_POWER_OFF_CARD) + pm_runtime_put_sync(&host->card->dev); + +out: + if (err) { + mmc_sdio_remove(host); + + mmc_claim_host(host); + mmc_detach_bus(host); + mmc_power_off(host); + mmc_release_host(host); + } +} + +/* + * SDIO pre_suspend. We need to suspend all functions separately. + * Therefore all registered functions must have drivers with suspend + * and resume methods. Failing that we simply remove the whole card. + */ +static int mmc_sdio_pre_suspend(struct mmc_host *host) +{ + int i, err = 0; + + for (i = 0; i < host->card->sdio_funcs; i++) { + struct sdio_func *func = host->card->sdio_func[i]; + if (func && sdio_func_present(func) && func->dev.driver) { + const struct dev_pm_ops *pmops = func->dev.driver->pm; + if (!pmops || !pmops->suspend || !pmops->resume) { + /* force removal of entire card in that case */ + err = -ENOSYS; + break; + } + } + } + + return err; +} + +/* + * SDIO suspend. Suspend all functions separately. + */ +static int mmc_sdio_suspend(struct mmc_host *host) +{ + /* Prevent processing of SDIO IRQs in suspended state. */ + mmc_card_set_suspended(host->card); + cancel_delayed_work_sync(&host->sdio_irq_work); + + mmc_claim_host(host); + + if (mmc_card_keep_power(host) && mmc_card_wake_sdio_irq(host)) + sdio_disable_wide(host->card); + + if (!mmc_card_keep_power(host)) { + mmc_power_off(host); + } else if (host->retune_period) { + mmc_retune_timer_stop(host); + mmc_retune_needed(host); + } + + mmc_release_host(host); + + return 0; +} + +static int mmc_sdio_resume(struct mmc_host *host) +{ + int err = 0; + + /* Basic card reinitialization. */ + mmc_claim_host(host); + + /* Restore power if needed */ + if (!mmc_card_keep_power(host)) { + mmc_power_up(host, host->card->ocr); + /* + * Tell runtime PM core we just powered up the card, + * since it still believes the card is powered off. + * Note that currently runtime PM is only enabled + * for SDIO cards that are MMC_CAP_POWER_OFF_CARD + */ + if (host->caps & MMC_CAP_POWER_OFF_CARD) { + pm_runtime_disable(&host->card->dev); + pm_runtime_set_active(&host->card->dev); + pm_runtime_enable(&host->card->dev); + } + } + + /* No need to reinitialize powered-resumed nonremovable cards */ + if (mmc_card_is_removable(host) || !mmc_card_keep_power(host)) { + err = mmc_sdio_reinit_card(host, mmc_card_keep_power(host)); + } else if (mmc_card_keep_power(host) && mmc_card_wake_sdio_irq(host)) { + /* We may have switched to 1-bit mode during suspend */ + err = sdio_enable_4bit_bus(host->card); + } + + if (err) + goto out; + + /* Allow SDIO IRQs to be processed again. */ + mmc_card_clr_suspended(host->card); + + if (host->sdio_irqs) { + if (!(host->caps2 & MMC_CAP2_SDIO_IRQ_NOTHREAD)) + wake_up_process(host->sdio_irq_thread); + else if (host->caps & MMC_CAP_SDIO_IRQ) + host->ops->enable_sdio_irq(host, 1); + } + +out: + mmc_release_host(host); + + host->pm_flags &= ~MMC_PM_KEEP_POWER; + return err; +} + +static int mmc_sdio_power_restore(struct mmc_host *host) +{ + int ret; + + /* + * Reset the card by performing the same steps that are taken by + * mmc_rescan_try_freq() and mmc_attach_sdio() during a "normal" probe. + * + * sdio_reset() is technically not needed. Having just powered up the + * hardware, it should already be in reset state. However, some + * platforms (such as SD8686 on OLPC) do not instantly cut power, + * meaning that a reset is required when restoring power soon after + * powering off. It is harmless in other cases. + * + * The CMD5 reset (mmc_send_io_op_cond()), according to the SDIO spec, + * is not necessary for non-removable cards. However, it is required + * for OLPC SD8686 (which expects a [CMD5,5,3,7] init sequence), and + * harmless in other situations. + * + */ + + mmc_claim_host(host); + + ret = mmc_sdio_reinit_card(host, mmc_card_keep_power(host)); + if (!ret && host->sdio_irqs) + mmc_signal_sdio_irq(host); + + mmc_release_host(host); + + return ret; +} + +static int mmc_sdio_runtime_suspend(struct mmc_host *host) +{ + /* No references to the card, cut the power to it. */ + mmc_claim_host(host); + mmc_power_off(host); + mmc_release_host(host); + + return 0; +} + +static int mmc_sdio_runtime_resume(struct mmc_host *host) +{ + int ret; + + /* Restore power and re-initialize. */ + mmc_claim_host(host); + mmc_power_up(host, host->card->ocr); + ret = mmc_sdio_power_restore(host); + mmc_release_host(host); + + return ret; +} + +static int mmc_sdio_hw_reset(struct mmc_host *host) +{ + mmc_power_cycle(host, host->card->ocr); + return mmc_sdio_power_restore(host); +} + +static int mmc_sdio_sw_reset(struct mmc_host *host) +{ + mmc_set_clock(host, host->f_init); + sdio_reset(host); + mmc_go_idle(host); + + mmc_set_initial_state(host); + mmc_set_initial_signal_voltage(host); + + return mmc_sdio_reinit_card(host, 0); +} + +static const struct mmc_bus_ops mmc_sdio_ops = { + .remove = mmc_sdio_remove, + .detect = mmc_sdio_detect, + .pre_suspend = mmc_sdio_pre_suspend, + .suspend = mmc_sdio_suspend, + .resume = mmc_sdio_resume, + .runtime_suspend = mmc_sdio_runtime_suspend, + .runtime_resume = mmc_sdio_runtime_resume, + .alive = mmc_sdio_alive, + .hw_reset = mmc_sdio_hw_reset, + .sw_reset = mmc_sdio_sw_reset, +}; + + +/* + * Starting point for SDIO card init. + */ +int mmc_attach_sdio(struct mmc_host *host) +{ + int err, i, funcs; + u32 ocr, rocr; + struct mmc_card *card; + + WARN_ON(!host->claimed); + + err = mmc_send_io_op_cond(host, 0, &ocr); + if (err) + return err; + + mmc_attach_bus(host, &mmc_sdio_ops); + if (host->ocr_avail_sdio) + host->ocr_avail = host->ocr_avail_sdio; + + + 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_sdio_init_card(host, rocr, NULL, 0); + if (err) + goto err; + + card = host->card; + + /* + * Enable runtime PM only if supported by host+card+board + */ + if (host->caps & MMC_CAP_POWER_OFF_CARD) { + /* + * Do not allow runtime suspend until after SDIO function + * devices are added. + */ + pm_runtime_get_noresume(&card->dev); + + /* + * Let runtime PM core know our card is active + */ + err = pm_runtime_set_active(&card->dev); + if (err) + goto remove; + + /* + * Enable runtime PM for this card + */ + pm_runtime_enable(&card->dev); + } + + /* + * The number of functions on the card is encoded inside + * the ocr. + */ + funcs = (ocr & 0x70000000) >> 28; + card->sdio_funcs = 0; + + /* + * Initialize (but don't add) all present functions. + */ + for (i = 0; i < funcs; i++, card->sdio_funcs++) { + err = sdio_init_func(host->card, i + 1); + if (err) + goto remove; + + /* + * Enable Runtime PM for this func (if supported) + */ + if (host->caps & MMC_CAP_POWER_OFF_CARD) + pm_runtime_enable(&card->sdio_func[i]->dev); + } + + /* + * First add the card to the driver model... + */ + mmc_release_host(host); + err = mmc_add_card(host->card); + if (err) + goto remove_added; + + /* + * ...then the SDIO functions. + */ + for (i = 0;i < funcs;i++) { + err = sdio_add_func(host->card->sdio_func[i]); + if (err) + goto remove_added; + } + + if (host->caps & MMC_CAP_POWER_OFF_CARD) + pm_runtime_put(&card->dev); + + mmc_claim_host(host); + return 0; + + +remove: + mmc_release_host(host); +remove_added: + /* + * The devices are being deleted so it is not necessary to disable + * runtime PM. Similarly we also don't pm_runtime_put() the SDIO card + * because it needs to be active to remove any function devices that + * were probed, and after that it gets deleted. + */ + mmc_sdio_remove(host); + mmc_claim_host(host); +err: + mmc_detach_bus(host); + + pr_err("%s: error %d whilst initialising SDIO card\n", + mmc_hostname(host), err); + + return err; +} + |