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drivers/sysreset/sysreset_sti.c
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/*
* Copyright (C) 2017, STMicroelectronics - All Rights Reserved
* Author(s): Patrice Chotard, <patrice.chotard@st.com> for STMicroelectronics.
*
* SPDX-License-Identifier: GPL-2.0+
*/
#include <common.h>
#include <dm.h>
#include <regmap.h>
#include <syscon.h>
#include <sysreset.h>
#include <asm/io.h>
DECLARE_GLOBAL_DATA_PTR;
struct sti_sysreset_priv {
phys_addr_t base;
};
static int sti_sysreset_request(struct udevice *dev, enum sysreset_t type)
{
struct sti_sysreset_priv *priv = dev_get_priv(dev);
generic_clear_bit(0, (void __iomem *)priv->base);
return -EINPROGRESS;
}
static int sti_sysreset_probe(struct udevice *dev)
{
struct sti_sysreset_priv *priv = dev_get_priv(dev);
struct udevice *syscon;
struct regmap *regmap;
struct fdtdec_phandle_args syscfg_phandle;
int ret;
/* get corresponding syscon phandle */
ret = fdtdec_parse_phandle_with_args(gd->fdt_blob, dev_of_offset(dev),
"st,syscfg", NULL, 0, 0,
&syscfg_phandle);
if (ret < 0) {
pr_err("Can't get syscfg phandle: %d
", ret);
return ret;
}
ret = uclass_get_device_by_of_offset(UCLASS_SYSCON,
syscfg_phandle.node,
&syscon);
if (ret) {
pr_err("%s: uclass_get_device_by_of_offset failed: %d
",
__func__, ret);
return ret;
}
regmap = syscon_get_regmap(syscon);
if (!regmap) {
pr_err("unable to get regmap for %s
", syscon->name);
return -ENODEV;
}
priv->base = regmap->base;
return 0;
}
static struct sysreset_ops sti_sysreset = {
.request = sti_sysreset_request,
};
static const struct udevice_id sti_sysreset_ids[] = {
{ .compatible = "st,stih407-restart" },
{ }
};
U_BOOT_DRIVER(sysreset_sti) = {
.name = "sysreset_sti",
.id = UCLASS_SYSRESET,
.ops = &sti_sysreset,
.probe = sti_sysreset_probe,
.of_match = sti_sysreset_ids,
.priv_auto_alloc_size = sizeof(struct sti_sysreset_priv),
};
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