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>
diff --git a/drivers/mmc/Kconfig b/drivers/mmc/Kconfig
index f8ea921..f8ca52e 100644
--- a/drivers/mmc/Kconfig
+++ b/drivers/mmc/Kconfig
@@ -18,6 +18,13 @@
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 1c849cb..89d6af3 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 0000000..2539f61
--- /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,
+};
diff --git a/include/mmc.h b/include/mmc.h
index effccaa..8600881 100644
--- a/include/mmc.h
+++ b/include/mmc.h
@@ -592,6 +592,9 @@
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_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);
/**