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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>
#include <linux/err.h>
struct syscon_reboot_priv {
struct regmap *regmap;
unsigned int offset;
unsigned int mask;
unsigned int value;
};
static int syscon_reboot_request(struct udevice *dev, enum sysreset_t type)
{
struct syscon_reboot_priv *priv = dev_get_priv(dev);
ulong driver_data = dev_get_driver_data(dev);
if (type != driver_data)
return -EPROTONOSUPPORT;
regmap_update_bits(priv->regmap, priv->offset, priv->mask, priv->value);
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;
int mask_err, value_err;
priv->regmap = syscon_regmap_lookup_by_phandle(dev, "regmap");
if (IS_ERR(priv->regmap)) {
pr_err("unable to find regmap\n");
return -ENODEV;
}
err = dev_read_u32(dev, "offset", &priv->offset);
if (err) {
pr_err("unable to find offset\n");
return -ENOENT;
}
mask_err = dev_read_u32(dev, "mask", &priv->mask);
value_err = dev_read_u32(dev, "value", &priv->value);
if (mask_err && value_err) {
pr_err("unable to find mask and value\n");
return -EINVAL;
}
if (value_err) {
/* support old binding */
priv->value = priv->mask;
priv->mask = 0xffffffff;
} else if (mask_err) {
/* support value without mask*/
priv->mask = 0xffffffff;
}
return 0;
}
static const struct udevice_id syscon_reboot_ids[] = {
{ .compatible = "syscon-reboot", .data = SYSRESET_COLD },
{ .compatible = "syscon-poweroff", .data = SYSRESET_POWER_OFF },
{ /* 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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