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// SPDX-License-Identifier: GPL-2.0
/*
* Copyright (C) ASPEED Technology Inc.
*/
#include <asm/io.h>
#include <dm.h>
#include <linux/err.h>
#include <reset.h>
#include <reset-uclass.h>
/* Offset of the modrst register block within the SCU. */
#define AST2700_RESET_OFFSET 0x200
struct ast2700_reset_priv {
void __iomem *base;
};
static int ast2700_reset_assert(struct reset_ctl *reset_ctl)
{
struct ast2700_reset_priv *priv = dev_get_priv(reset_ctl->dev);
if (reset_ctl->id < 32)
writel(BIT(reset_ctl->id), priv->base);
else
writel(BIT(reset_ctl->id - 32), priv->base + 0x20);
return 0;
}
static int ast2700_reset_deassert(struct reset_ctl *reset_ctl)
{
struct ast2700_reset_priv *priv = dev_get_priv(reset_ctl->dev);
if (reset_ctl->id < 32)
writel(BIT(reset_ctl->id), priv->base + 0x04);
else
writel(BIT(reset_ctl->id - 32), priv->base + 0x24);
return 0;
}
static int ast2700_reset_status(struct reset_ctl *reset_ctl)
{
struct ast2700_reset_priv *priv = dev_get_priv(reset_ctl->dev);
int status;
if (reset_ctl->id < 32)
status = BIT(reset_ctl->id) & readl(priv->base);
else
status = BIT(reset_ctl->id - 32) & readl(priv->base + 0x20);
return !!status;
}
static int ast2700_reset_probe(struct udevice *dev)
{
struct ast2700_reset_priv *priv = dev_get_priv(dev);
void __iomem *scu_base;
scu_base = dev_read_addr_ptr(dev);
if (!scu_base)
return -EINVAL;
priv->base = scu_base + AST2700_RESET_OFFSET;
return 0;
}
static const struct reset_ops ast2700_reset_ops = {
.rst_assert = ast2700_reset_assert,
.rst_deassert = ast2700_reset_deassert,
.rst_status = ast2700_reset_status,
};
U_BOOT_DRIVER(ast2700_reset) = {
.name = "ast2700_reset",
.id = UCLASS_RESET,
.probe = ast2700_reset_probe,
.ops = &ast2700_reset_ops,
.priv_auto = sizeof(struct ast2700_reset_priv),
};
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