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path: root/drivers/power/reset/zx-reboot.c
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Diffstat (limited to 'drivers/power/reset/zx-reboot.c')
-rw-r--r--drivers/power/reset/zx-reboot.c80
1 files changed, 80 insertions, 0 deletions
diff --git a/drivers/power/reset/zx-reboot.c b/drivers/power/reset/zx-reboot.c
new file mode 100644
index 000000000..a5b009673
--- /dev/null
+++ b/drivers/power/reset/zx-reboot.c
@@ -0,0 +1,80 @@
+/*
+ * 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>
+
+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);