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Subject[PATCH v5 2/8] power: reset: Add reboot driver for brcmstb
Date
Add support for reboot functionality on boards with ARM-based
Broadcom STB chipsets.

Signed-off-by: Marc Carino <marc.ceeeee@gmail.com>
---
drivers/power/reset/Kconfig | 10 +++
drivers/power/reset/Makefile | 1 +
drivers/power/reset/brcmstb-reboot.c | 120 ++++++++++++++++++++++++++++++++++
3 files changed, 131 insertions(+), 0 deletions(-)
create mode 100644 drivers/power/reset/brcmstb-reboot.c

diff --git a/drivers/power/reset/Kconfig b/drivers/power/reset/Kconfig
index 9b3ea53..31b468b 100644
--- a/drivers/power/reset/Kconfig
+++ b/drivers/power/reset/Kconfig
@@ -6,6 +6,16 @@ menuconfig POWER_RESET

Say Y here to enable board reset and power off

+config POWER_RESET_BRCMSTB
+ bool "Broadcom STB reset driver"
+ depends on POWER_RESET && 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 3e6ed88..806d056 100644
--- a/drivers/power/reset/Makefile
+++ b/drivers/power/reset/Makefile
@@ -4,3 +4,4 @@ obj-$(CONFIG_POWER_RESET_QNAP) += qnap-poweroff.o
obj-$(CONFIG_POWER_RESET_RESTART) += restart-poweroff.o
obj-$(CONFIG_POWER_RESET_VEXPRESS) += vexpress-poweroff.o
obj-$(CONFIG_POWER_RESET_XGENE) += xgene-reboot.o
+obj-$(CONFIG_POWER_RESET_BRCMSTB) += brcmstb-reboot.o
diff --git a/drivers/power/reset/brcmstb-reboot.c b/drivers/power/reset/brcmstb-reboot.c
new file mode 100644
index 0000000..3f23692
--- /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);
--
1.7.1


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