diff options
| author | Jaehoon Chung | 2021-02-16 10:16:52 +0900 |
|---|---|---|
| committer | Peng Fan | 2021-02-19 15:10:41 +0800 |
| commit | caee38aef71105c6bbc1910bad0e60bdabd053e2 (patch) | |
| tree | 6cf7cdfccce51040f1deddd9251f82b0ecd62219 /drivers/mmc | |
| parent | 46938abd2c4c2b605c5af9483fff20ef6772eafc (diff) | |
mmc: pwrseq: add mmc-pwrseq file to provide a generic interface
Add mmc-pwrseq file to provide a generic interface.
Signed-off-by: Jaehoon Chung <jh80.chung@samsung.com>
Diffstat (limited to 'drivers/mmc')
| -rw-r--r-- | drivers/mmc/Kconfig | 7 | ||||
| -rw-r--r-- | drivers/mmc/Makefile | 1 | ||||
| -rw-r--r-- | drivers/mmc/mmc-pwrseq.c | 51 |
3 files changed, 59 insertions, 0 deletions
diff --git a/drivers/mmc/Kconfig b/drivers/mmc/Kconfig index f8ea92172e4..f8ca52efb6b 100644 --- a/drivers/mmc/Kconfig +++ b/drivers/mmc/Kconfig @@ -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 diff --git a/drivers/mmc/Makefile b/drivers/mmc/Makefile index 1c849cbab2f..89d6af3db30 100644 --- a/drivers/mmc/Makefile +++ b/drivers/mmc/Makefile @@ -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 diff --git a/drivers/mmc/mmc-pwrseq.c b/drivers/mmc/mmc-pwrseq.c new file mode 100644 index 00000000000..2539f61323d --- /dev/null +++ b/drivers/mmc/mmc-pwrseq.c @@ -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, +}; |