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// SPDX-License-Identifier: GPL-2.0
/*
* Copyright (C) 2018 MediaTek Inc.
*
* Author: Ryder Lee <ryder.lee@mediatek.com>
* Weijie Gao <weijie.gao@mediatek.com>
*/
#include <dm.h>
#include <log.h>
#include <malloc.h>
#include <dm/lists.h>
#include <regmap.h>
#include <reset-uclass.h>
#include <syscon.h>
#include <dm/device-internal.h>
#include <linux/bitops.h>
#include <linux/err.h>
struct mediatek_reset_priv {
struct regmap *regmap;
u32 regofs;
u32 nr_resets;
};
static int mediatek_reset_assert(struct reset_ctl *reset_ctl)
{
struct mediatek_reset_priv *priv = dev_get_priv(reset_ctl->dev);
int id = reset_ctl->id;
if (id >= priv->nr_resets)
return -EINVAL;
return regmap_update_bits(priv->regmap,
priv->regofs + ((id / 32) << 2), BIT(id % 32), BIT(id % 32));
}
static int mediatek_reset_deassert(struct reset_ctl *reset_ctl)
{
struct mediatek_reset_priv *priv = dev_get_priv(reset_ctl->dev);
int id = reset_ctl->id;
if (id >= priv->nr_resets)
return -EINVAL;
return regmap_update_bits(priv->regmap,
priv->regofs + ((id / 32) << 2), BIT(id % 32), 0);
}
struct reset_ops mediatek_reset_ops = {
.rst_assert = mediatek_reset_assert,
.rst_deassert = mediatek_reset_deassert,
};
static int mediatek_reset_probe(struct udevice *dev)
{
struct mediatek_reset_priv *priv = dev_get_priv(dev);
if (!priv->regofs && !priv->nr_resets)
return -EINVAL;
priv->regmap = syscon_node_to_regmap(dev_ofnode(dev));
if (IS_ERR(priv->regmap))
return PTR_ERR(priv->regmap);
return 0;
}
int mediatek_reset_bind(struct udevice *pdev, u32 regofs, u32 num_regs)
{
struct udevice *rst_dev;
struct mediatek_reset_priv *priv;
int ret;
ret = device_bind_driver_to_node(pdev, "mediatek_reset", "reset",
dev_ofnode(pdev), &rst_dev);
if (ret)
return ret;
priv = malloc(sizeof(struct mediatek_reset_priv));
if (!priv)
return -ENOMEM;
priv->regofs = regofs;
priv->nr_resets = num_regs * 32;
dev_set_priv(rst_dev, priv);
return 0;
}
U_BOOT_DRIVER(mediatek_reset) = {
.name = "mediatek_reset",
.id = UCLASS_RESET,
.probe = mediatek_reset_probe,
.ops = &mediatek_reset_ops,
.priv_auto = sizeof(struct mediatek_reset_priv),
};
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