5 files changed, 152 insertions, 34 deletions

diff --git a/drivers/power/reset/Kconfig b/drivers/power/reset/Kconfig
index bdcf5173e377..f2ac54df496f 100644
--- a/drivers/power/reset/Kconfig
+++ b/drivers/power/reset/Kconfig
@@ -20,6 +20,17 @@ config POWER_RESET_AXXIA
 
 	  Say Y if you have an Axxia family SoC.
 
+config POWER_RESET_BRCMSTB
+	bool "Broadcom STB reset driver" if COMPILE_TEST
+	depends on POWER_RESET && ARM
+	default ARCH_BRCMSTB
+	help
+	  This driver provides restart support for ARM-based Broadcom STB
+	  boards.
+
+	  Say Y here if you have an ARM-based Broadcom STB board and you wish
+	  to have restart support.
+
 config POWER_RESET_GPIO
 	bool "GPIO power-off driver"
 	depends on OF_GPIO && POWER_RESET
diff --git a/drivers/power/reset/Makefile b/drivers/power/reset/Makefile
index dde2e8bbac53..7379818ca69d 100644
--- a/drivers/power/reset/Makefile
+++ b/drivers/power/reset/Makefile
@@ -1,5 +1,6 @@
 obj-$(CONFIG_POWER_RESET_AS3722) += as3722-poweroff.o
 obj-$(CONFIG_POWER_RESET_AXXIA) += axxia-reset.o
+obj-$(CONFIG_POWER_RESET_BRCMSTB) += brcmstb-reboot.o
 obj-$(CONFIG_POWER_RESET_GPIO) += gpio-poweroff.o
 obj-$(CONFIG_POWER_RESET_MSM) += msm-poweroff.o
 obj-$(CONFIG_POWER_RESET_QNAP) += qnap-poweroff.o
diff --git a/drivers/power/reset/brcmstb-reboot.c b/drivers/power/reset/brcmstb-reboot.c
new file mode 100644
index 000000000000..3f236924742a
--- /dev/null
+++ b/drivers/power/reset/brcmstb-reboot.c
@@ -0,0 +1,120 @@
+/*
+ * Copyright (C) 2013 Broadcom Corporation
+ *
+ * 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 version 2.
+ *
+ * This program is distributed "as is" WITHOUT ANY WARRANTY of any
+ * kind, whether express or implied; without even the implied warranty
+ * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#include <linux/device.h>
+#include <linux/errno.h>
+#include <linux/init.h>
+#include <linux/io.h>
+#include <linux/jiffies.h>
+#include <linux/of_address.h>
+#include <linux/of_irq.h>
+#include <linux/of_platform.h>
+#include <linux/platform_device.h>
+#include <linux/printk.h>
+#include <linux/reboot.h>
+#include <linux/regmap.h>
+#include <linux/smp.h>
+#include <linux/mfd/syscon.h>
+
+#include <asm/system_misc.h>
+
+#define RESET_SOURCE_ENABLE_REG 1
+#define SW_MASTER_RESET_REG 2
+
+static struct regmap *regmap;
+static u32 rst_src_en;
+static u32 sw_mstr_rst;
+
+static void brcmstb_reboot(enum reboot_mode mode, const char *cmd)
+{
+	int rc;
+	u32 tmp;
+
+	rc = regmap_write(regmap, rst_src_en, 1);
+	if (rc) {
+		pr_err("failed to write rst_src_en (%d)\n", rc);
+		return;
+	}
+
+	rc = regmap_read(regmap, rst_src_en, &tmp);
+	if (rc) {
+		pr_err("failed to read rst_src_en (%d)\n", rc);
+		return;
+	}
+
+	rc = regmap_write(regmap, sw_mstr_rst, 1);
+	if (rc) {
+		pr_err("failed to write sw_mstr_rst (%d)\n", rc);
+		return;
+	}
+
+	rc = regmap_read(regmap, sw_mstr_rst, &tmp);
+	if (rc) {
+		pr_err("failed to read sw_mstr_rst (%d)\n", rc);
+		return;
+	}
+
+	while (1)
+		;
+}
+
+static int brcmstb_reboot_probe(struct platform_device *pdev)
+{
+	int rc;
+	struct device_node *np = pdev->dev.of_node;
+
+	regmap = syscon_regmap_lookup_by_phandle(np, "syscon");
+	if (IS_ERR(regmap)) {
+		pr_err("failed to get syscon phandle\n");
+		return -EINVAL;
+	}
+
+	rc = of_property_read_u32_index(np, "syscon", RESET_SOURCE_ENABLE_REG,
+					&rst_src_en);
+	if (rc) {
+		pr_err("can't get rst_src_en offset (%d)\n", rc);
+		return -EINVAL;
+	}
+
+	rc = of_property_read_u32_index(np, "syscon", SW_MASTER_RESET_REG,
+					&sw_mstr_rst);
+	if (rc) {
+		pr_err("can't get sw_mstr_rst offset (%d)\n", rc);
+		return -EINVAL;
+	}
+
+	arm_pm_restart = brcmstb_reboot;
+
+	return 0;
+}
+
+static const struct of_device_id of_match[] = {
+	{ .compatible = "brcm,brcmstb-reboot", },
+	{},
+};
+
+static struct platform_driver brcmstb_reboot_driver = {
+	.probe = brcmstb_reboot_probe,
+	.driver = {
+		.name = "brcmstb-reboot",
+		.owner = THIS_MODULE,
+		.of_match_table = of_match,
+	},
+};
+
+static int __init brcmstb_reboot_init(void)
+{
+	return platform_driver_probe(&brcmstb_reboot_driver,
+					brcmstb_reboot_probe);
+}
+subsys_initcall(brcmstb_reboot_init);
diff --git a/drivers/power/reset/gpio-poweroff.c b/drivers/power/reset/gpio-poweroff.c
index e290d48ddd99..ce849bc9b269 100644
--- a/drivers/power/reset/gpio-poweroff.c
+++ b/drivers/power/reset/gpio-poweroff.c
@@ -15,31 +15,29 @@
 #include <linux/init.h>
 #include <linux/delay.h>
 #include <linux/platform_device.h>
-#include <linux/gpio.h>
+#include <linux/gpio/consumer.h>
 #include <linux/of_platform.h>
-#include <linux/of_gpio.h>
 #include <linux/module.h>
 
 /*
  * Hold configuration here, cannot be more than one instance of the driver
  * since pm_power_off itself is global.
  */
-static int gpio_num = -1;
-static int gpio_active_low;
+static struct gpio_desc *reset_gpio;
 
 static void gpio_poweroff_do_poweroff(void)
 {
-	BUG_ON(!gpio_is_valid(gpio_num));
+	BUG_ON(!reset_gpio);
 
 	/* drive it active, also inactive->active edge */
-	gpio_direction_output(gpio_num, !gpio_active_low);
+	gpiod_direction_output(reset_gpio, 1);
 	mdelay(100);
 	/* drive inactive, also active->inactive edge */
-	gpio_set_value(gpio_num, gpio_active_low);
+	gpiod_set_value(reset_gpio, 0);
 	mdelay(100);
 
 	/* drive it active, also inactive->active edge */
-	gpio_set_value(gpio_num, !gpio_active_low);
+	gpiod_set_value(reset_gpio, 1);
 
 	/* give it some time */
 	mdelay(3000);
@@ -49,54 +47,42 @@ static void gpio_poweroff_do_poweroff(void)
 
 static int gpio_poweroff_probe(struct platform_device *pdev)
 {
-	enum of_gpio_flags flags;
 	bool input = false;
-	int ret;
 
 	/* If a pm_power_off function has already been added, leave it alone */
 	if (pm_power_off != NULL) {
-		pr_err("%s: pm_power_off function already registered",
+		dev_err(&pdev->dev,
+			"%s: pm_power_off function already registered",
 		       __func__);
 		return -EBUSY;
 	}
 
-	gpio_num = of_get_gpio_flags(pdev->dev.of_node, 0, &flags);
-	if (!gpio_is_valid(gpio_num))
-		return gpio_num;
-
-	gpio_active_low = flags & OF_GPIO_ACTIVE_LOW;
+	reset_gpio = devm_gpiod_get(&pdev->dev, NULL);
+	if (IS_ERR(reset_gpio))
+		return PTR_ERR(reset_gpio);
 
 	input = of_property_read_bool(pdev->dev.of_node, "input");
 
-	ret = gpio_request(gpio_num, "poweroff-gpio");
-	if (ret) {
-		pr_err("%s: Could not get GPIO %d", __func__, gpio_num);
-		return ret;
-	}
 	if (input) {
-		if (gpio_direction_input(gpio_num)) {
-			pr_err("Could not set direction of GPIO %d to input",
-			       gpio_num);
-			goto err;
+		if (gpiod_direction_input(reset_gpio)) {
+			dev_err(&pdev->dev,
+				"Could not set direction of reset GPIO to input\n");
+			return -ENODEV;
 		}
 	} else {
-		if (gpio_direction_output(gpio_num, gpio_active_low)) {
-			pr_err("Could not set direction of GPIO %d", gpio_num);
-			goto err;
+		if (gpiod_direction_output(reset_gpio, 0)) {
+			dev_err(&pdev->dev,
+				"Could not set direction of reset GPIO\n");
+			return -ENODEV;
 		}
 	}
 
 	pm_power_off = &gpio_poweroff_do_poweroff;
 	return 0;
-
-err:
-	gpio_free(gpio_num);
-	return -ENODEV;
 }
 
 static int gpio_poweroff_remove(struct platform_device *pdev)
 {
-	gpio_free(gpio_num);
 	if (pm_power_off == &gpio_poweroff_do_poweroff)
 		pm_power_off = NULL;
 
diff --git a/drivers/power/reset/restart-poweroff.c b/drivers/power/reset/restart-poweroff.c
index 5758033e0c16..3e51f8d29bfe 100644
--- a/drivers/power/reset/restart-poweroff.c
+++ b/drivers/power/reset/restart-poweroff.c
@@ -62,5 +62,5 @@ module_platform_driver(restart_poweroff_driver);
 
 MODULE_AUTHOR("Andrew Lunn <andrew@lunn.ch");
 MODULE_DESCRIPTION("restart poweroff driver");
-MODULE_LICENSE("GPLv2");
+MODULE_LICENSE("GPL v2");
 MODULE_ALIAS("platform:poweroff-restart");