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// 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);
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