summaryrefslogtreecommitdiff
path: root/drivers/mmc
diff options
context:
space:
mode:
authorMarek Szyprowski <m.szyprowski@samsung.com>2015-02-03 14:07:53 +0100
committerUlf Hansson <ulf.hansson@linaro.org>2015-02-04 09:45:09 +0100
commit726b6324e36b39788f9cdcb918df48bc4d475268 (patch)
tree65dd8aa7f2d32f9c428b2d68692e2835b37b9e44 /drivers/mmc
parent3981c516664d81a3e83c1923fa1ab3988c529402 (diff)
downloadkernel-726b6324e36b39788f9cdcb918df48bc4d475268.tar.gz
mmc: pwrseq: add driver for emmc hardware reset
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> Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
Diffstat (limited to 'drivers/mmc')
-rw-r--r--drivers/mmc/core/Makefile2
-rw-r--r--drivers/mmc/core/pwrseq.c3
-rw-r--r--drivers/mmc/core/pwrseq.h1
-rw-r--r--drivers/mmc/core/pwrseq_emmc.c101
4 files changed, 106 insertions, 1 deletions
diff --git a/drivers/mmc/core/Makefile b/drivers/mmc/core/Makefile
index b39cbd2f830b..2c25138f28b7 100644
--- a/drivers/mmc/core/Makefile
+++ b/drivers/mmc/core/Makefile
@@ -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
diff --git a/drivers/mmc/core/pwrseq.c b/drivers/mmc/core/pwrseq.c
index 2cea00ed4e65..862356123d78 100644
--- a/drivers/mmc/core/pwrseq.c
+++ b/drivers/mmc/core/pwrseq.c
@@ -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,
},
};
diff --git a/drivers/mmc/core/pwrseq.h b/drivers/mmc/core/pwrseq.h
index bd860d88f116..aba3409e8d6e 100644
--- a/drivers/mmc/core/pwrseq.h
+++ b/drivers/mmc/core/pwrseq.h
@@ -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
diff --git a/drivers/mmc/core/pwrseq_emmc.c b/drivers/mmc/core/pwrseq_emmc.c
new file mode 100644
index 000000000000..a2d545904fbf
--- /dev/null
+++ b/drivers/mmc/core/pwrseq_emmc.c
@@ -0,0 +1,101 @@
+/*
+ * 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 provider
+ */
+#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_emmc_reset(struct mmc_pwrseq_emmc *pwrseq)
+{
+ gpiod_set_value(pwrseq->reset_gpio, 1);
+ udelay(1);
+ gpiod_set_value(pwrseq->reset_gpio, 0);
+ udelay(200);
+}
+
+static void mmc_pwrseq_emmc_reset(struct mmc_host *host)
+{
+ struct mmc_pwrseq_emmc *pwrseq = container_of(host->pwrseq,
+ struct mmc_pwrseq_emmc, pwrseq);
+
+ __mmc_pwrseq_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);
+
+ unregister_restart_handler(&pwrseq->reset_nb);
+ gpiod_put(pwrseq->reset_gpio);
+ kfree(pwrseq);
+ host->pwrseq = NULL;
+}
+
+static struct mmc_pwrseq_ops mmc_pwrseq_emmc_ops = {
+ .post_power_on = 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 = container_of(this,
+ struct mmc_pwrseq_emmc, reset_nb);
+
+ __mmc_pwrseq_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)) {
+ ret = PTR_ERR(pwrseq->reset_gpio);
+ goto free;
+ }
+
+ /*
+ * register reset handler to ensure emmc reset also from
+ * emergency_reboot(), priority 129 schedules it just before
+ * system reboot
+ */
+ pwrseq->reset_nb.notifier_call = mmc_pwrseq_emmc_reset_nb;
+ pwrseq->reset_nb.priority = 129;
+ register_restart_handler(&pwrseq->reset_nb);
+
+ pwrseq->pwrseq.ops = &mmc_pwrseq_emmc_ops;
+ host->pwrseq = &pwrseq->pwrseq;
+
+ return 0;
+free:
+ kfree(pwrseq);
+ return ret;
+}