power/reset: zx: Register restart handler

Register with kernel restart handler instead of setting arm_pm_restart
directly.

Signed-off-by: Jun Nie <jun.nie@linaro.org>
Signed-off-by: Sebastian Reichel <sre@kernel.org>

3 files changed, 90 insertions, 0 deletions

diff --git a/drivers/power/reset/Kconfig b/drivers/power/reset/Kconfig
index 17d93a73c513..5a0189bf19bb 100644
--- a/drivers/power/reset/Kconfig
+++ b/drivers/power/reset/Kconfig
@@ -166,5 +166,12 @@ config POWER_RESET_RMOBILE
         help
           Reboot support for Renesas R-Mobile and SH-Mobile SoCs.
 
+config POWER_RESET_ZX
+        tristate "ZTE SoCs reset driver"
+        depends on ARCH_ZX || COMPILE_TEST
+        depends on HAS_IOMEM
+        help
+          Reboot support for ZTE SoCs.
+
 endif
 
diff --git a/drivers/power/reset/Makefile b/drivers/power/reset/Makefile
index dbe06c368743..096fa67047f6 100644
--- a/drivers/power/reset/Makefile
+++ b/drivers/power/reset/Makefile
@@ -19,3 +19,4 @@ obj-$(CONFIG_POWER_RESET_KEYSTONE) += keystone-reset.o
 obj-$(CONFIG_POWER_RESET_SYSCON) += syscon-reboot.o
 obj-$(CONFIG_POWER_RESET_SYSCON_POWEROFF) += syscon-poweroff.o
 obj-$(CONFIG_POWER_RESET_RMOBILE) += rmobile-reset.o
+obj-$(CONFIG_POWER_RESET_ZX) += zx-reboot.o
diff --git a/drivers/power/reset/zx-reboot.c b/drivers/power/reset/zx-reboot.c
new file mode 100644
index 000000000000..cf4b973dcedf
--- /dev/null
+++ b/drivers/power/reset/zx-reboot.c
@@ -0,0 +1,82 @@
+/*
+ * ZTE zx296702 SoC reset code
+ *
+ * Copyright (c) 2015 Linaro Ltd.
+ *
+ * Author: Jun Nie <jun.nie@linaro.org>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include <linux/delay.h>
+#include <linux/io.h>
+#include <linux/module.h>
+#include <linux/notifier.h>
+#include <linux/of_address.h>
+#include <linux/platform_device.h>
+#include <linux/reboot.h>
+
+#include <asm/proc-fns.h>
+
+static void __iomem *base;
+static void __iomem *pcu_base;
+
+static int zx_restart_handler(struct notifier_block *this,
+                              unsigned long mode, void *cmd)
+{
+        writel_relaxed(1, base + 0xb0);
+        writel_relaxed(1, pcu_base + 0x34);
+
+        mdelay(50);
+        pr_emerg("Unable to restart system\n");
+
+        return NOTIFY_DONE;
+}
+
+static struct notifier_block zx_restart_nb = {
+        .notifier_call = zx_restart_handler,
+        .priority = 128,
+};
+
+static int zx_reboot_probe(struct platform_device *pdev)
+{
+        struct device_node *np = pdev->dev.of_node;
+        int err;
+
+        base = of_iomap(np, 0);
+        if (!base) {
+                WARN(1, "failed to map base address");
+                return -ENODEV;
+        }
+
+        np = of_find_compatible_node(NULL, NULL, "zte,zx296702-pcu");
+        pcu_base = of_iomap(np, 0);
+        if (!pcu_base) {
+                iounmap(base);
+                WARN(1, "failed to map pcu_base address");
+                return -ENODEV;
+        }
+
+        err = register_restart_handler(&zx_restart_nb);
+        if (err)
+                dev_err(&pdev->dev, "Register restart handler failed(err=%d)\n",
+                        err);
+
+        return err;
+}
+
+static const struct of_device_id zx_reboot_of_match[] = {
+        { .compatible = "zte,sysctrl" },
+        {}
+};
+
+static struct platform_driver zx_reboot_driver = {
+        .probe = zx_reboot_probe,
+        .driver = {
+                .name = "zx-reboot",
+                .of_match_table = zx_reboot_of_match,
+        },
+};
+module_platform_driver(zx_reboot_driver);