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// SPDX-License-Identifier: GPL-2.0+
/*
* Copyright (C) 2017 Álvaro Fernández Rojas <noltari@gmail.com>
*
* Derived from linux/drivers/power/reset/syscon-reboot.c:
* Copyright (C) 2013, Applied Micro Circuits Corporation
* Author: Feng Kan <fkan@apm.com>
*/
#include <common.h>
#include <dm.h>
#include <errno.h>
#include <regmap.h>
#include <sysreset.h>
#include <syscon.h>
struct syscon_reboot_priv {
struct regmap *regmap;
unsigned int offset;
unsigned int mask;
};
static int syscon_reboot_request(struct udevice *dev, enum sysreset_t type)
{
struct syscon_reboot_priv *priv = dev_get_priv(dev);
regmap_write(priv->regmap, priv->offset, priv->mask);
return -EINPROGRESS;
}
static struct sysreset_ops syscon_reboot_ops = {
.request = syscon_reboot_request,
};
int syscon_reboot_probe(struct udevice *dev)
{
struct syscon_reboot_priv *priv = dev_get_priv(dev);
int err;
u32 phandle;
ofnode node;
err = ofnode_read_u32(dev_ofnode(dev), "regmap", &phandle);
if (err)
return err;
node = ofnode_get_by_phandle(phandle);
if (!ofnode_valid(node))
return -EINVAL;
priv->regmap = syscon_node_to_regmap(node);
if (!priv->regmap) {
pr_err("unable to find regmap\n");
return -ENODEV;
}
priv->offset = dev_read_u32_default(dev, "offset", 0);
priv->mask = dev_read_u32_default(dev, "mask", 0);
return 0;
}
static const struct udevice_id syscon_reboot_ids[] = {
{ .compatible = "syscon-reboot" },
{ /* sentinel */ }
};
U_BOOT_DRIVER(syscon_reboot) = {
.name = "syscon_reboot",
.id = UCLASS_SYSRESET,
.of_match = syscon_reboot_ids,
.probe = syscon_reboot_probe,
.priv_auto_alloc_size = sizeof(struct syscon_reboot_priv),
.ops = &syscon_reboot_ops,
};
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