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// SPDX-License-Identifier: GPL-2.0+
/*
* Copyright (C) 2017 Álvaro Fernández Rojas <noltari@gmail.com>
*
* Derived from linux/arch/mips/bcm63xx/reset.c:
* Copyright (C) 2012 Jonas Gorski <jonas.gorski@gmail.com>
*/
#include <common.h>
#include <dm.h>
#include <errno.h>
#include <reset-uclass.h>
#include <asm/io.h>
#define MAX_RESETS 32
struct bcm6345_reset_priv {
void __iomem *regs;
};
static int bcm6345_reset_assert(struct reset_ctl *rst)
{
struct bcm6345_reset_priv *priv = dev_get_priv(rst->dev);
clrbits_be32(priv->regs, BIT(rst->id));
mdelay(20);
return 0;
}
static int bcm6345_reset_deassert(struct reset_ctl *rst)
{
struct bcm6345_reset_priv *priv = dev_get_priv(rst->dev);
setbits_be32(priv->regs, BIT(rst->id));
mdelay(20);
return 0;
}
static int bcm6345_reset_free(struct reset_ctl *rst)
{
return 0;
}
static int bcm6345_reset_request(struct reset_ctl *rst)
{
if (rst->id >= MAX_RESETS)
return -EINVAL;
return bcm6345_reset_assert(rst);
}
struct reset_ops bcm6345_reset_reset_ops = {
.free = bcm6345_reset_free,
.request = bcm6345_reset_request,
.rst_assert = bcm6345_reset_assert,
.rst_deassert = bcm6345_reset_deassert,
};
static const struct udevice_id bcm6345_reset_ids[] = {
{ .compatible = "brcm,bcm6345-reset" },
{ /* sentinel */ }
};
static int bcm6345_reset_probe(struct udevice *dev)
{
struct bcm6345_reset_priv *priv = dev_get_priv(dev);
fdt_addr_t addr;
fdt_size_t size;
addr = devfdt_get_addr_size_index(dev, 0, &size);
if (addr == FDT_ADDR_T_NONE)
return -EINVAL;
priv->regs = ioremap(addr, size);
return 0;
}
U_BOOT_DRIVER(bcm6345_reset) = {
.name = "bcm6345-reset",
.id = UCLASS_RESET,
.of_match = bcm6345_reset_ids,
.ops = &bcm6345_reset_reset_ops,
.probe = bcm6345_reset_probe,
.priv_auto_alloc_size = sizeof(struct bcm6345_reset_priv),
};
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