Add the rt linux 4.1.3-rt3 as base

[kvmfornfv.git] / kernel / drivers / power / reset / hisi-reboot.c

diff --git a/kernel/drivers/power/reset/hisi-reboot.c b/kernel/drivers/power/reset/hisi-reboot.c
new file mode 100644 (file)
index 0000000..9ab7f56
--- /dev/null
+++ b/kernel/drivers/power/reset/hisi-reboot.c
@@ -0,0 +1,79 @@
+/*
+ * Hisilicon SoC reset code
+ *
+ * Copyright (c) 2014 Hisilicon Ltd.
+ * Copyright (c) 2014 Linaro Ltd.
+ *
+ * Author: Haojian Zhuang <haojian.zhuang@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 u32 reboot_offset;
+
+static int hisi_restart_handler(struct notifier_block *this,
+                               unsigned long mode, void *cmd)
+{
+       writel_relaxed(0xdeadbeef, base + reboot_offset);
+
+       while (1)
+               cpu_do_idle();
+
+       return NOTIFY_DONE;
+}
+
+static struct notifier_block hisi_restart_nb = {
+       .notifier_call = hisi_restart_handler,
+       .priority = 128,
+};
+
+static int hisi_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;
+       }
+
+       if (of_property_read_u32(np, "reboot-offset", &reboot_offset) < 0) {
+               pr_err("failed to find reboot-offset property\n");
+               return -EINVAL;
+       }
+
+       err = register_restart_handler(&hisi_restart_nb);
+       if (err)
+               dev_err(&pdev->dev, "cannot register restart handler (err=%d)\n",
+                       err);
+
+       return err;
+}
+
+static const struct of_device_id hisi_reboot_of_match[] = {
+       { .compatible = "hisilicon,sysctrl" },
+       {}
+};
+
+static struct platform_driver hisi_reboot_driver = {
+       .probe = hisi_reboot_probe,
+       .driver = {
+               .name = "hisi-reboot",
+               .of_match_table = hisi_reboot_of_match,
+       },
+};
+module_platform_driver(hisi_reboot_driver);