1 files changed, 95 insertions, 0 deletions
diff --git a/drivers/power/reset/xgene-reboot.c b/drivers/power/reset/xgene-reboot.c
new file mode 100644
index 000000000..0b0d2fd2b
--- /dev/null
+++ b/drivers/power/reset/xgene-reboot.c
@@ -0,0 +1,95 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * AppliedMicro X-Gene SoC Reboot Driver
+ *
+ * Copyright (c) 2013, Applied Micro Circuits Corporation
+ * Author: Feng Kan <fkan@apm.com>
+ * Author: Loc Ho <lho@apm.com>
+ *
+ * This driver provides system reboot functionality for APM X-Gene SoC.
+ * For system shutdown, this is board specify. If a board designer
+ * implements GPIO shutdown, use the gpio-poweroff.c driver.
+ */
+#include <linux/delay.h>
+#include <linux/io.h>
+#include <linux/notifier.h>
+#include <linux/of_device.h>
+#include <linux/of_address.h>
+#include <linux/platform_device.h>
+#include <linux/reboot.h>
+#include <linux/stat.h>
+#include <linux/slab.h>
+
+struct xgene_reboot_context {
+	struct device *dev;
+	void *csr;
+	u32 mask;
+	struct notifier_block restart_handler;
+};
+
+static int xgene_restart_handler(struct notifier_block *this,
+				 unsigned long mode, void *cmd)
+{
+	struct xgene_reboot_context *ctx =
+		container_of(this, struct xgene_reboot_context,
+			     restart_handler);
+
+	/* Issue the reboot */
+	writel(ctx->mask, ctx->csr);
+
+	mdelay(1000);
+
+	dev_emerg(ctx->dev, "Unable to restart system\n");
+
+	return NOTIFY_DONE;
+}
+
+static int xgene_reboot_probe(struct platform_device *pdev)
+{
+	struct xgene_reboot_context *ctx;
+	struct device *dev = &pdev->dev;
+	int err;
+
+	ctx = devm_kzalloc(dev, sizeof(*ctx), GFP_KERNEL);
+	if (!ctx)
+		return -ENOMEM;
+
+	ctx->csr = of_iomap(dev->of_node, 0);
+	if (!ctx->csr) {
+		dev_err(dev, "can not map resource\n");
+		return -ENODEV;
+	}
+
+	if (of_property_read_u32(dev->of_node, "mask", &ctx->mask))
+		ctx->mask = 0xFFFFFFFF;
+
+	ctx->dev = dev;
+	ctx->restart_handler.notifier_call = xgene_restart_handler;
+	ctx->restart_handler.priority = 128;
+	err = register_restart_handler(&ctx->restart_handler);
+	if (err) {
+		iounmap(ctx->csr);
+		dev_err(dev, "cannot register restart handler (err=%d)\n", err);
+	}
+
+	return err;
+}
+
+static const struct of_device_id xgene_reboot_of_match[] = {
+	{ .compatible = "apm,xgene-reboot" },
+	{}
+};
+
+static struct platform_driver xgene_reboot_driver = {
+	.probe = xgene_reboot_probe,
+	.driver = {
+		.name = "xgene-reboot",
+		.of_match_table = xgene_reboot_of_match,
+	},
+};
+
+static int __init xgene_reboot_init(void)
+{
+	return platform_driver_register(&xgene_reboot_driver);
+}
+device_initcall(xgene_reboot_init);