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path: root/drivers/power/reset/hisi-reboot.c
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Diffstat (limited to 'drivers/power/reset/hisi-reboot.c')
-rw-r--r--drivers/power/reset/hisi-reboot.c79
1 files changed, 79 insertions, 0 deletions
diff --git a/drivers/power/reset/hisi-reboot.c b/drivers/power/reset/hisi-reboot.c
new file mode 100644
index 000000000..0ba5fdce1
--- /dev/null
+++ b/drivers/power/reset/hisi-reboot.c
@@ -0,0 +1,79 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Hisilicon SoC reset code
+ *
+ * Copyright (c) 2014 Hisilicon Ltd.
+ * Copyright (c) 2014 Linaro Ltd.
+ *
+ * Author: Haojian Zhuang <haojian.zhuang@linaro.org>
+ */
+
+#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");
+ iounmap(base);
+ return -EINVAL;
+ }
+
+ err = register_restart_handler(&hisi_restart_nb);
+ if (err) {
+ dev_err(&pdev->dev, "cannot register restart handler (err=%d)\n",
+ err);
+ iounmap(base);
+ }
+
+ 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);