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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Generic Syscon Reboot Driver
*
* Copyright (c) 2013, Applied Micro Circuits Corporation
* Author: Feng Kan <fkan@apm.com>
*/
#include <common.h>
#include <init.h>
#include <restart.h>
#include <mfd/syscon.h>
struct syscon_reboot_context {
struct regmap *map;
u32 offset;
u32 value;
u32 mask;
struct restart_handler restart_handler;
};
static void __noreturn syscon_restart_handle(struct restart_handler *this)
{
struct syscon_reboot_context *ctx =
container_of(this, struct syscon_reboot_context,
restart_handler);
/* Issue the reboot */
regmap_update_bits(ctx->map, ctx->offset, ctx->mask, ctx->value);
mdelay(1000);
panic("Unable to restart system\n");
}
static int syscon_reboot_probe(struct device_d *dev)
{
struct syscon_reboot_context *ctx;
int mask_err, value_err;
int err;
ctx = kzalloc(sizeof(*ctx), GFP_KERNEL);
if (!ctx)
return -ENOMEM;
ctx->map = syscon_regmap_lookup_by_phandle(dev->device_node, "regmap");
if (IS_ERR(ctx->map)) {
ctx->map = syscon_node_to_regmap(dev->parent->device_node);
if (IS_ERR(ctx->map))
return PTR_ERR(ctx->map);
}
if (of_property_read_u32(dev->device_node, "offset", &ctx->offset))
return -EINVAL;
value_err = of_property_read_u32(dev->device_node, "value", &ctx->value);
mask_err = of_property_read_u32(dev->device_node, "mask", &ctx->mask);
if (value_err && mask_err) {
dev_err(dev, "unable to read 'value' and 'mask'");
return -EINVAL;
}
if (value_err) {
/* support old binding */
ctx->value = ctx->mask;
ctx->mask = 0xFFFFFFFF;
} else if (mask_err) {
/* support value without mask*/
ctx->mask = 0xFFFFFFFF;
}
ctx->restart_handler.name = "syscon-reboot";
ctx->restart_handler.restart = syscon_restart_handle;
ctx->restart_handler.priority = 192;
ctx->restart_handler.of_node = dev->device_node;
err = restart_handler_register(&ctx->restart_handler);
if (err)
dev_err(dev, "can't register restart notifier\n");
return err;
}
static const struct of_device_id syscon_reboot_of_match[] = {
{ .compatible = "syscon-reboot" },
{}
};
static struct driver_d syscon_reboot_driver = {
.probe = syscon_reboot_probe,
.name = "syscon-reboot",
.of_compatible = syscon_reboot_of_match,
};
coredevice_platform_driver(syscon_reboot_driver);
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