Orange Pi5 kernel

// 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;
}