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- // SPDX-License-Identifier: GPL-2.0-or-later
- /*
- * linux/drivers/mmc/sdio.c
- *
- * Copyright 2006-2007 Pierre Ossman
- */
- #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"
- 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);
- MMC_DEV_ATTR(ocr, "0x%08x\n", card->ocr);
- MMC_DEV_ATTR(rca, "0x%04x\n", card->rca);
- #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 sprintf(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 *sdio_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_ocr.attr,
- &dev_attr_rca.attr,
- NULL,
- };
- ATTRIBUTE_GROUPS(sdio_std);
- static struct device_type sdio_type = {
- .groups = sdio_std_groups,
- };
- 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 | SD_MODE_UHS_SDR50
- | SD_MODE_UHS_SDR25 | SD_MODE_UHS_SDR12;
- if (data & SDIO_UHS_SDR50)
- card->sw_caps.sd3_bus_mode
- |= SD_MODE_UHS_SDR50 | SD_MODE_UHS_SDR25
- | SD_MODE_UHS_SDR12;
- if (data & SDIO_UHS_SDR104)
- card->sw_caps.sd3_bus_mode
- |= SD_MODE_UHS_SDR104 | SD_MODE_UHS_SDR50
- | SD_MODE_UHS_SDR25 | SD_MODE_UHS_SDR12;
- }
- 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_disable_4bit_bus(struct mmc_card *card)
- {
- int err;
- if (card->type == MMC_TYPE_SDIO)
- goto out;
- if (!(card->host->caps & MMC_CAP_4_BIT_DATA))
- return 0;
- if (!(card->scr.bus_widths & SD_SCR_BUS_WIDTH_4))
- return 0;
- err = mmc_app_set_bus_width(card, MMC_BUS_WIDTH_1);
- if (err)
- return err;
- out:
- return sdio_disable_wide(card);
- }
- static int sdio_enable_4bit_bus(struct mmc_card *card)
- {
- int err;
- err = sdio_enable_wide(card);
- if (err <= 0)
- return err;
- if (card->type == MMC_TYPE_SDIO)
- goto out;
- if (card->scr.bus_widths & SD_SCR_BUS_WIDTH_4) {
- err = mmc_app_set_bus_width(card, MMC_BUS_WIDTH_4);
- if (err) {
- sdio_disable_wide(card);
- return err;
- }
- }
- out:
- mmc_set_bus_width(card->host, MMC_BUS_WIDTH_4);
- return 0;
- }
- /*
- * 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);
- 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 int mmc_sdio_pre_init(struct mmc_host *host, u32 ocr,
- struct mmc_card *card)
- {
- if (card)
- mmc_remove_card(card);
- /*
- * 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.
- *
- */
- sdio_reset(host);
- mmc_go_idle(host);
- mmc_send_if_cond(host, ocr);
- return mmc_send_io_op_cond(host, 0, NULL);
- }
- /*
- * 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)
- {
- 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
- */
- err = mmc_send_io_op_cond(host, ocr, &rocr);
- if (err)
- return err;
- /*
- * For SPI, enable CRC as appropriate.
- */
- if (mmc_host_is_spi(host)) {
- err = mmc_spi_set_crc(host, use_spi_crc);
- if (err)
- return err;
- }
- /*
- * Allocate card structure.
- */
- card = mmc_alloc_card(host, &sdio_type);
- if (IS_ERR(card))
- return PTR_ERR(card);
- 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)) {
- err = -ENOENT;
- goto mismatch;
- }
- } else {
- card->type = MMC_TYPE_SDIO;
- if (oldcard && oldcard->type != MMC_TYPE_SDIO) {
- err = -ENOENT;
- goto mismatch;
- }
- }
- /*
- * 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 (rocr & ocr & R4_18V_PRESENT) {
- err = mmc_set_uhs_voltage(host, ocr_card);
- if (err == -EAGAIN) {
- mmc_sdio_pre_init(host, ocr_card, card);
- retries--;
- goto try_again;
- } else if (err) {
- ocr &= ~R4_18V_PRESENT;
- }
- }
- /*
- * For native busses: set card RCA and quit open drain mode.
- */
- if (!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)
- goto remove;
- mmc_decode_cid(card);
- }
- /*
- * Select card, as all following commands rely on that.
- */
- if (!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);
- }
- if (oldcard)
- mmc_remove_card(card);
- else
- host->card = card;
- return 0;
- }
- /*
- * 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_pre_init(host, ocr_card, 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) {
- if (card->cis.vendor == oldcard->cis.vendor &&
- card->cis.device == oldcard->cis.device) {
- mmc_remove_card(card);
- card = oldcard;
- } else {
- err = -ENOENT;
- goto mismatch;
- }
- }
- 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;
- }
- host->card = card;
- return 0;
- mismatch:
- pr_debug("%s: Perhaps the card was replaced\n", mmc_hostname(host));
- remove:
- if (oldcard != card)
- mmc_remove_card(card);
- return err;
- }
- static int mmc_sdio_reinit_card(struct mmc_host *host)
- {
- int ret;
- ret = mmc_sdio_pre_init(host, host->card->ocr, NULL);
- if (ret)
- return ret;
- return mmc_sdio_init_card(host, host->card->ocr, host->card);
- }
- /*
- * 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;
- 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 */
- goto remove;
- }
- }
- return 0;
- remove:
- if (!mmc_card_is_removable(host)) {
- dev_warn(mmc_dev(host),
- "missing suspend/resume ops for non-removable SDIO card\n");
- /* Don't remove a non-removable card - we can't re-detect it. */
- return 0;
- }
- /* Remove the SDIO card and let it be re-detected later on. */
- mmc_sdio_remove(host);
- mmc_claim_host(host);
- mmc_detach_bus(host);
- mmc_power_off(host);
- mmc_release_host(host);
- host->pm_flags = 0;
- return 0;
- }
- /*
- * SDIO suspend. Suspend all functions separately.
- */
- static int mmc_sdio_suspend(struct mmc_host *host)
- {
- WARN_ON(host->sdio_irqs && !mmc_card_keep_power(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_4bit_bus(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 and reinitialize the card when needed. Note that a
- * removable card is checked from a detect work later on in the resume
- * process.
- */
- 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);
- }
- err = mmc_sdio_reinit_card(host);
- } else if (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)
- queue_delayed_work(system_wq, &host->sdio_irq_work, 0);
- }
- out:
- mmc_release_host(host);
- host->pm_flags &= ~MMC_PM_KEEP_POWER;
- return err;
- }
- 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_reinit_card(host);
- mmc_release_host(host);
- return ret;
- }
- /*
- * SDIO HW reset
- *
- * Returns 0 if the HW reset was executed synchronously, returns 1 if the HW
- * reset was asynchronously scheduled, else a negative error code.
- */
- static int mmc_sdio_hw_reset(struct mmc_host *host)
- {
- struct mmc_card *card = host->card;
- /*
- * In case the card is shared among multiple func drivers, reset the
- * card through a rescan work. In this way it will be removed and
- * re-detected, thus all func drivers becomes informed about it.
- */
- if (atomic_read(&card->sdio_funcs_probed) > 1) {
- if (mmc_card_removed(card))
- return 1;
- host->rescan_entered = 0;
- mmc_card_set_removed(card);
- _mmc_detect_change(host, 0, false);
- return 1;
- }
- /*
- * A single func driver has been probed, then let's skip the heavy
- * hotplug dance above and execute the reset immediately.
- */
- mmc_power_cycle(host, card->ocr);
- return mmc_sdio_reinit_card(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);
- }
- 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);
- 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;
- }
|