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mmc: pwrseq: add mmc-pwrseq file to provide a generic interface

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Add mmc-pwrseq file to provide a generic interface.

Signed-off-by: Jaehoon Chung <jh80.chung@samsung.com>
This commit is contained in:
Jaehoon Chung 2021-02-16 10:16:52 +09:00 committed by Peng Fan
parent 46938abd2c
commit caee38aef7
4 changed files with 73 additions and 0 deletions
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7
drivers/mmc/Kconfig
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@ -18,6 +18,13 @@ config MMC_WRITE
help
Enable write access to MMC and SD Cards
config MMC_PWRSEQ
bool "HW reset support for eMMC"
depends on PWRSEQ
help
Ths select Hardware reset support aka pwrseq-emmc for eMMC
devices.
config MMC_BROKEN_CD
bool "Poll for broken card detection case"
help

1
drivers/mmc/Makefile
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@ -6,6 +6,7 @@
obj-y += mmc.o
obj-$(CONFIG_$(SPL_)DM_MMC) += mmc-uclass.o
obj-$(CONFIG_$(SPL_)MMC_WRITE) += mmc_write.o
obj-$(CONFIG_MMC_PWRSEQ) += mmc-pwrseq.o
obj-$(CONFIG_MMC_SDHCI_ADMA_HELPERS) += sdhci-adma.o
ifndef CONFIG_$(SPL_)BLK

51
drivers/mmc/mmc-pwrseq.c Normal file
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@ -0,0 +1,51 @@
// SPDX-License-Identifier: GPL-2.0+
/*
* (C) Copyright 2021 SAMSUNG Electronics
* Jaehoon Chung <jh80.chung@samsung.com>
*/
#include <common.h>
#include <dm.h>
#include <mmc.h>
#include <pwrseq.h>
#include <asm/gpio.h>
#include <linux/delay.h>
int mmc_pwrseq_get_power(struct udevice *dev, struct mmc_config *cfg)
{
/* Enable power if needed */
return uclass_get_device_by_phandle(UCLASS_PWRSEQ, dev, "mmc-pwrseq",
&cfg->pwr_dev);
}
static int mmc_pwrseq_set_power(struct udevice *dev, bool enable)
{
struct gpio_desc reset;
int ret;
ret = gpio_request_by_name(dev, "reset-gpios", 0, &reset, GPIOD_IS_OUT);
if (ret)
return ret;
dm_gpio_set_value(&reset, 1);
udelay(1);
dm_gpio_set_value(&reset, 0);
udelay(200);
return 0;
}
static const struct pwrseq_ops mmc_pwrseq_ops = {
.set_power = mmc_pwrseq_set_power,
};
static const struct udevice_id mmc_pwrseq_ids[] = {
{ .compatible = "mmc-pwrseq-emmc" },
{ }
};
U_BOOT_DRIVER(mmc_pwrseq_drv) = {
.name = "mmc_pwrseq_emmc",
.id = UCLASS_PWRSEQ,
.of_match = mmc_pwrseq_ids,
.ops = &mmc_pwrseq_ops,
};

14
include/mmc.h
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@ -592,6 +592,9 @@ struct mmc_config {
uint f_max;
uint b_max;
unsigned char part_type;
#ifdef CONFIG_MMC_PWRSEQ
struct udevice *pwr_dev;
#endif
};
struct sd_ssr {
@ -808,6 +811,17 @@ int mmc_deinit(struct mmc *mmc);
*/
int mmc_of_parse(struct udevice *dev, struct mmc_config *cfg);
#ifdef CONFIG_MMC_PWRSEQ
/**
* mmc_pwrseq_get_power() - get a power device from device tree
*
* @dev: MMC device
* @cfg: MMC configuration
* @return 0 if OK, -ve on error
*/
int mmc_pwrseq_get_power(struct udevice *dev, struct mmc_config *cfg);
#endif
int mmc_read(struct mmc *mmc, u64 src, uchar *dst, int size);
/**