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/*
* Generic Syscon Reboot Driver
*
* Copyright (c) 2013, Applied Micro Circuits Corporation
* Author: Feng Kan <fkan@apm.com>
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation; either version 2 of
* the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*/
#include <linux/delay.h>
#include <linux/io.h>
#include <linux/notifier.h>
#include <linux/mfd/syscon.h>
#include <linux/of_address.h>
#include <linux/of_device.h>
#include <linux/platform_device.h>
#include <linux/reboot.h>
#include <linux/regmap.h>
#include <asm/system_misc.h>
struct syscon_reboot_context {
struct platform_device *pdev;
struct regmap *map;
u32 offset;
u32 mask;
};
static struct syscon_reboot_context *syscon_reboot_context;
static void syscon_restart(enum reboot_mode reboot_mode, const char *cmd)
{
struct syscon_reboot_context *ctx = syscon_reboot_context;
/* Issue the reboot */
regmap_write(ctx->map, ctx->offset, ctx->mask);
mdelay(1000);
dev_emerg(&ctx->pdev->dev, "Unable to restart system\n");
}
static int syscon_reboot_probe(struct platform_device *pdev)
{
struct syscon_reboot_context *ctx;
struct device *dev = &pdev->dev;
ctx = devm_kzalloc(&pdev->dev, sizeof(*ctx), GFP_KERNEL);
if (!ctx)
return -ENOMEM;
ctx->map = syscon_regmap_lookup_by_phandle(dev->of_node, "regmap");
if (IS_ERR(ctx->map))
return PTR_ERR(ctx->map);
if (of_property_read_u32(pdev->dev.of_node, "offset", &ctx->offset))
return -EINVAL;
if (of_property_read_u32(pdev->dev.of_node, "mask", &ctx->mask))
return -EINVAL;
ctx->pdev = pdev;
syscon_reboot_context = ctx;
arm_pm_restart = syscon_restart;
return 0;
}
static struct of_device_id syscon_reboot_of_match[] = {
{ .compatible = "syscon-reboot" },
{}
};
static struct platform_driver syscon_reboot_driver = {
.probe = syscon_reboot_probe,
.driver = {
.name = "syscon-reboot",
.of_match_table = syscon_reboot_of_match,
},
};
module_platform_driver(syscon_reboot_driver);
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