This patch adds a driver implementing correct reboot and poweroff
procedures for Exynos4412-based Hardkernel's Odroid X/X2/U2/U3/U3+
boards.
Signed-off-by: Marek Szyprowski <m.szyprowski@xxxxxxxxxxx>
---
.../bindings/power/reset/odroid-reset.txt | 18 ++++
drivers/power/reset/Kconfig | 6 ++
drivers/power/reset/Makefile | 1 +
drivers/power/reset/odroid-reboot.c | 119 +++++++++++++++++++++
4 files changed, 144 insertions(+)
create mode 100644 Documentation/devicetree/bindings/power/reset/odroid-reset.txt
create mode 100644 drivers/power/reset/odroid-reboot.c
diff --git a/Documentation/devicetree/bindings/power/reset/odroid-reset.txt b/Documentation/devicetree/bindings/power/reset/odroid-reset.txt
new file mode 100644
index 000000000000..86471a463518
--- /dev/null
+++ b/Documentation/devicetree/bindings/power/reset/odroid-reset.txt
@@ -0,0 +1,18 @@
+* Device tree bindings for Hardkernel's Exynos4412 based Odroid boards
+
+This node is intended to allow proper system reboot and power off of
+Odroid X/X2/U2/U3/U3+ boards with eMMC storage. Without this node, board
+hangs during standard reset procedure.
+
+Required properties:
+- compatible: hardkernel,odroid-reboot
+- samsung,pmureg-phandle: phandle to Exynos PMU node
+- reset-gpios: phandle and gpio-specifier to the GPIO pin
+ connected to the eMMC_nDET
+
+Example:
+odroid_reboot {
+ compatible = "hardkernel,odroid-reboot";
+ samsung,pmureg-phandle = <&pmu_system_controller>;
+ reset-gpio = <&gpk1 2 0>;
+};
diff --git a/drivers/power/reset/Kconfig b/drivers/power/reset/Kconfig
index f65ff49bb275..f02b13d5344f 100644
--- a/drivers/power/reset/Kconfig
+++ b/drivers/power/reset/Kconfig
@@ -84,6 +84,12 @@ config POWER_RESET_LTC2952
This driver supports an external powerdown trigger and board power
down via the LTC2952. Bindings are made in the device tree.
+config POWER_RESET_ODROID
+ bool "Hardkernel's Exynos4412 based Odroid reboot driver"
+ depends on POWER_RESET && ARCH_EXYNOS
+ help
+ Power off and restart support for Odroid boards.
+
config POWER_RESET_QNAP
bool "QNAP power-off driver"
depends on OF_GPIO && PLAT_ORION
diff --git a/drivers/power/reset/Makefile b/drivers/power/reset/Makefile
index 76ce1c59469b..178ee86eb813 100644
--- a/drivers/power/reset/Makefile
+++ b/drivers/power/reset/Makefile
@@ -8,6 +8,7 @@ obj-$(CONFIG_POWER_RESET_GPIO_RESTART) += gpio-restart.o
obj-$(CONFIG_POWER_RESET_HISI) += hisi-reboot.o
obj-$(CONFIG_POWER_RESET_MSM) += msm-poweroff.o
obj-$(CONFIG_POWER_RESET_LTC2952) += ltc2952-poweroff.o
+obj-$(CONFIG_POWER_RESET_ODROID) += odroid-reboot.o
obj-$(CONFIG_POWER_RESET_QNAP) += qnap-poweroff.o
obj-$(CONFIG_POWER_RESET_RESTART) += restart-poweroff.o
obj-$(CONFIG_POWER_RESET_SUN6I) += sun6i-reboot.o
diff --git a/drivers/power/reset/odroid-reboot.c b/drivers/power/reset/odroid-reboot.c
new file mode 100644
index 000000000000..823e93539220
--- /dev/null
+++ b/drivers/power/reset/odroid-reboot.c
@@ -0,0 +1,119 @@
+/*
+ * Copyright (c) 2014 Samsung Electronics Co., Ltd.
+ * http://www.samsung.com
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ */
+
+#include <linux/delay.h>
+#include <linux/gpio.h>
+#include <linux/io.h>
+#include <linux/mfd/syscon.h>
+#include <linux/module.h>
+#include <linux/of_platform.h>
+#include <linux/of_gpio.h>
+#include <linux/reboot.h>
+#include <linux/regmap.h>
+
+#include <asm/system_misc.h>
+
+#define PS_HOLD_CONTROL 0x330C
+
+struct odroid_reboot_data {
+ struct device *dev;
+ int power_gpio;
+ struct regmap *reg_pmu;
+ void (*reboot_func)(enum reboot_mode mode, const char *cmd);
+};
+
+static struct odroid_reboot_data *reboot_data;
+
+static void odroid_reboot(enum reboot_mode mode, const char *cmd)
+{
+ local_irq_disable();
+
+ gpio_set_value(reboot_data->power_gpio, 0);
+ mdelay(150);
+ gpio_set_value(reboot_data->power_gpio, 1);
+
+ reboot_data->reboot_func(mode, cmd);
+
+ pr_emerg("%s: waiting for reboot\n", __func__);
+ while (1)
+ ;
+}
+
+static void odroid_power_off(void)
+{
+ regmap_update_bits(reboot_data->reg_pmu, PS_HOLD_CONTROL, 0xffffffff, 0x5200);
+ while (1) {
+ pr_emerg("%s: should not reach here!\n", __func__);
+ msleep(1000);
+ }
+}
+
+static struct odroid_reboot_data *odroid_reboot_parse_dt(struct device *dev)
+{
+ struct device_node *np = dev->of_node;
+ struct odroid_reboot_data *data;
+
+ data = devm_kzalloc(dev, sizeof(struct odroid_reboot_data), GFP_KERNEL);
+ if (!data)
+ return NULL;
+
+ data->power_gpio = of_get_named_gpio(np, "reset-gpios", 0);
+ if (!gpio_is_valid(data->power_gpio)) {
+ dev_err(dev, "invalid reset gpio pin\n");
+ return NULL;
+ }
+ devm_gpio_request(dev, data->power_gpio, "reset");
+
+ data->reg_pmu = syscon_regmap_lookup_by_phandle(np,
+ "samsung,pmureg-phandle");
+ if (IS_ERR(data->reg_pmu)) {
+ dev_err(dev, "failed to map PMU registers\n");
+ return NULL;
+ }
+
+ return data;
+}
+
+static int odroid_reboot_probe(struct platform_device *pdev)
+{
+ struct device *dev = &pdev->dev;
+
+ if (pdev->dev.of_node)
+ reboot_data = odroid_reboot_parse_dt(dev);
+
+ if (!reboot_data)
+ return -EINVAL;
+
+ reboot_data->dev = &pdev->dev;
+ reboot_data->reboot_func = arm_pm_restart;
+
+ /* grab reboot arm specific hook */
+ arm_pm_restart = odroid_reboot;
+
+ /* register power off function */
+ pm_power_off = odroid_power_off;
+
+ return 0;
+}
+
+static struct of_device_id odroid_reboot_of_match[] = {
+ { .compatible = "hardkernel,odroid-reboot", },
+ { },
+};
+
+static struct platform_driver odroid_reboot_driver = {
+ .probe = odroid_reboot_probe,
+ .driver = {
+ .name = "odroid-reboot",
+ .owner = THIS_MODULE,
+ .of_match_table = of_match_ptr(odroid_reboot_of_match),
+ }
+};
+module_platform_driver(odroid_reboot_driver);
--
1.9.2
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