new file mode 100644
@@ -0,0 +1,25 @@
+* The simple eMMC hardware reset provider
+
+The purpose of this driver is to perform standard eMMC hw reset
+procedure, as descibed by Jedec 4.4 specification. This procedure is
+performed just after MMC core enabled power to the given mmc host (to
+fix possible issues if bootloader has left eMMC card in initialized or
+unknown state), and before performing complete system reboot (also in
+case of emergency reboot call). The latter is needed on boards, which
+doesn't have hardware reset logic connected to emmc card and (limited or
+broken) ROM bootloaders are unable to read second stage from the emmc
+card if the card is left in unknown or already initialized state.
+
+Required properties:
+- compatible : contains "mmc-pwrseq-emmc".
+- reset-gpios : contains a GPIO specifier. The reset GPIO is pulled
+ down and then pulled up to perform eMMC card reset. To perform
+ reset procedure as described in Jedec 4.4 specification, the
+ gpio line should be defined as GPIO_ACTIVE_LOW.
+
+Example:
+
+ sdhci0_pwrseq {
+ compatible = "mmc-pwrseq-emmc";
+ reset-gpios = <&gpio1 12 GPIO_ACTIVE_LOW>;
+ }
@@ -8,5 +8,5 @@ mmc_core-y := core.o bus.o host.o \
sdio.o sdio_ops.o sdio_bus.o \
sdio_cis.o sdio_io.o sdio_irq.o \
quirks.o slot-gpio.o
-mmc_core-$(CONFIG_OF) += pwrseq.o pwrseq_simple.o
+mmc_core-$(CONFIG_OF) += pwrseq.o pwrseq_simple.o pwrseq_emmc.o
mmc_core-$(CONFIG_DEBUG_FS) += debugfs.o
@@ -26,6 +26,9 @@ static struct mmc_pwrseq_match pwrseq_match[] = {
{
.compatible = "mmc-pwrseq-simple",
.alloc = mmc_pwrseq_simple_alloc,
+ }, {
+ .compatible = "mmc-pwrseq-emmc",
+ .alloc = mmc_pwrseq_emmc_alloc,
},
};
@@ -28,6 +28,7 @@ void mmc_pwrseq_power_off(struct mmc_host *host);
void mmc_pwrseq_free(struct mmc_host *host);
int mmc_pwrseq_simple_alloc(struct mmc_host *host, struct device *dev);
+int mmc_pwrseq_emmc_alloc(struct mmc_host *host, struct device *dev);
#else
new file mode 100644
@@ -0,0 +1,108 @@
+/*
+ * Copyright (C) 2015, Samsung Electronics Co., Ltd.
+ *
+ * Author: Marek Szyprowski <m.szyprowski@samsung.com>
+ *
+ * License terms: GNU General Public License (GPL) version 2
+ *
+ * Simple eMMC hardware reset trigger
+ */
+#include <linux/delay.h>
+#include <linux/kernel.h>
+#include <linux/slab.h>
+#include <linux/device.h>
+#include <linux/err.h>
+#include <linux/gpio/consumer.h>
+#include <linux/reboot.h>
+
+#include <linux/mmc/host.h>
+
+#include "pwrseq.h"
+
+struct mmc_pwrseq_emmc {
+ struct mmc_pwrseq pwrseq;
+ struct notifier_block reset_nb;
+ struct gpio_desc *reset_gpio;
+};
+
+static void mmc_pwrseq_perform_emmc_reset(struct mmc_pwrseq_emmc *pwrseq)
+{
+ gpiod_set_value(pwrseq->reset_gpio, 1);
+ /* For eMMC, minimum is 1us but give it 10us for good measure */
+ udelay(10);
+ gpiod_set_value(pwrseq->reset_gpio, 0);
+ /* For eMMC, minimum is 200us but give it 300us for good measure */
+ udelay(300);
+}
+
+static void mmc_pwrseq_emmc_reset(struct mmc_host *host)
+{
+ struct mmc_pwrseq_emmc *pwrseq = container_of(host->pwrseq,
+ struct mmc_pwrseq_emmc, pwrseq);
+
+ if (!IS_ERR(pwrseq->reset_gpio))
+ mmc_pwrseq_perform_emmc_reset(pwrseq);
+}
+
+static void mmc_pwrseq_emmc_free(struct mmc_host *host)
+{
+ struct mmc_pwrseq_emmc *pwrseq = container_of(host->pwrseq,
+ struct mmc_pwrseq_emmc, pwrseq);
+
+ if (!IS_ERR(pwrseq->reset_gpio))
+ gpiod_put(pwrseq->reset_gpio);
+
+ unregister_restart_handler(&pwrseq->reset_nb);
+ kfree(pwrseq);
+ host->pwrseq = NULL;
+}
+
+static struct mmc_pwrseq_ops mmc_pwrseq_emmc_ops = {
+ .post_power_on = mmc_pwrseq_emmc_reset,
+ .power_off = mmc_pwrseq_emmc_reset,
+ .free = mmc_pwrseq_emmc_free,
+};
+
+static int mmc_pwrseq_emmc_reset_nb(struct notifier_block *this,
+ unsigned long mode, void *cmd)
+{
+ struct mmc_pwrseq_emmc *pwrseq;
+ pwrseq = container_of(this, struct mmc_pwrseq_emmc, reset_nb);
+ if (!IS_ERR(pwrseq->reset_gpio))
+ mmc_pwrseq_perform_emmc_reset(pwrseq);
+ return NOTIFY_DONE;
+}
+
+int mmc_pwrseq_emmc_alloc(struct mmc_host *host, struct device *dev)
+{
+ struct mmc_pwrseq_emmc *pwrseq;
+ int ret = 0;
+
+ pwrseq = kzalloc(sizeof(struct mmc_pwrseq_emmc), GFP_KERNEL);
+ if (!pwrseq)
+ return -ENOMEM;
+
+ pwrseq->reset_gpio = gpiod_get_index(dev, "reset", 0, GPIOD_OUT_LOW);
+ if (IS_ERR(pwrseq->reset_gpio) &&
+ PTR_ERR(pwrseq->reset_gpio) != -ENOENT &&
+ PTR_ERR(pwrseq->reset_gpio) != -ENOSYS) {
+ ret = PTR_ERR(pwrseq->reset_gpio);
+ goto free;
+ }
+
+ /*
+ * register reset handler to ensure emmc reset also from
+ * emergency_reboot()
+ */
+ pwrseq->reset_nb.notifier_call = mmc_pwrseq_emmc_reset_nb;
+ pwrseq->reset_nb.priority = 255;
+ register_restart_handler(&pwrseq->reset_nb);
+
+ pwrseq->pwrseq.ops = &mmc_pwrseq_emmc_ops;
+ host->pwrseq = &pwrseq->pwrseq;
+
+ return 0;
+free:
+ kfree(pwrseq);
+ return ret;
+}
This patch provides a simple mmc-pwrseq-emmc driver, which controls single gpio line. It perform standard eMMC hw reset procedure, as descibed by Jedec 4.4 specification. This procedure is performed just after MMC core enabled power to the given mmc host (to fix possible issues if bootloader has left eMMC card in initialized or unknown state), and before performing complete system reboot (also in case of emergency reboot call). The latter is needed on boards, which doesn't have hardware reset logic connected to emmc card and (limited or broken) ROM bootloaders are unable to read second stage from the emmc card if the card is left in unknown or already initialized state. Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com> --- .../devicetree/bindings/mmc/mmc-pwrseq-emmc.txt | 25 +++++ drivers/mmc/core/Makefile | 2 +- drivers/mmc/core/pwrseq.c | 3 + drivers/mmc/core/pwrseq.h | 1 + drivers/mmc/core/pwrseq_emmc.c | 108 +++++++++++++++++++++ 5 files changed, 138 insertions(+), 1 deletion(-) create mode 100644 Documentation/devicetree/bindings/mmc/mmc-pwrseq-emmc.txt create mode 100644 drivers/mmc/core/pwrseq_emmc.c