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// SPDX-License-Identifier: GPL-2.0-only
/*
* Copyright (c) 2014 MediaTek Inc.
*/
#include <linux/mfd/syscon.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/platform_device.h>
#include <linux/regmap.h>
#include <linux/slab.h>
#include "reset.h"
static inline struct mtk_clk_rst_data *to_mtk_clk_rst_data(struct reset_controller_dev *rcdev)
{
return container_of(rcdev, struct mtk_clk_rst_data, rcdev);
}
static int mtk_reset_update(struct reset_controller_dev *rcdev,
unsigned long id, bool deassert)
{
struct mtk_clk_rst_data *data = to_mtk_clk_rst_data(rcdev);
unsigned int val = deassert ? 0 : ~0;
return regmap_update_bits(data->regmap,
data->desc->rst_bank_ofs[id / RST_NR_PER_BANK],
BIT(id % RST_NR_PER_BANK), val);
}
static int mtk_reset_assert(struct reset_controller_dev *rcdev,
unsigned long id)
{
return mtk_reset_update(rcdev, id, false);
}
static int mtk_reset_deassert(struct reset_controller_dev *rcdev,
unsigned long id)
{
return mtk_reset_update(rcdev, id, true);
}
static int mtk_reset(struct reset_controller_dev *rcdev, unsigned long id)
{
int ret;
ret = mtk_reset_assert(rcdev, id);
if (ret)
return ret;
return mtk_reset_deassert(rcdev, id);
}
static int mtk_reset_update_set_clr(struct reset_controller_dev *rcdev,
unsigned long id, bool deassert)
{
struct mtk_clk_rst_data *data = to_mtk_clk_rst_data(rcdev);
unsigned int deassert_ofs = deassert ? 0x4 : 0;
return regmap_write(data->regmap,
data->desc->rst_bank_ofs[id / RST_NR_PER_BANK] +
deassert_ofs,
BIT(id % RST_NR_PER_BANK));
}
static int mtk_reset_assert_set_clr(struct reset_controller_dev *rcdev,
unsigned long id)
{
return mtk_reset_update_set_clr(rcdev, id, false);
}
static int mtk_reset_deassert_set_clr(struct reset_controller_dev *rcdev,
unsigned long id)
{
return mtk_reset_update_set_clr(rcdev, id, true);
}
static int mtk_reset_set_clr(struct reset_controller_dev *rcdev,
unsigned long id)
{
int ret;
ret = mtk_reset_assert_set_clr(rcdev, id);
if (ret)
return ret;
return mtk_reset_deassert_set_clr(rcdev, id);
}
static const struct reset_control_ops mtk_reset_ops = {
.assert = mtk_reset_assert,
.deassert = mtk_reset_deassert,
.reset = mtk_reset,
};
static const struct reset_control_ops mtk_reset_ops_set_clr = {
.assert = mtk_reset_assert_set_clr,
.deassert = mtk_reset_deassert_set_clr,
.reset = mtk_reset_set_clr,
};
static int reset_xlate(struct reset_controller_dev *rcdev,
const struct of_phandle_args *reset_spec)
{
struct mtk_clk_rst_data *data = to_mtk_clk_rst_data(rcdev);
if (reset_spec->args[0] >= rcdev->nr_resets ||
reset_spec->args[0] >= data->desc->rst_idx_map_nr)
return -EINVAL;
return data->desc->rst_idx_map[reset_spec->args[0]];
}
int mtk_register_reset_controller(struct device_node *np,
const struct mtk_clk_rst_desc *desc)
{
struct regmap *regmap;
const struct reset_control_ops *rcops = NULL;
struct mtk_clk_rst_data *data;
int ret;
if (!desc) {
pr_err("mtk clock reset desc is NULL\n");
return -EINVAL;
}
switch (desc->version) {
case MTK_RST_SIMPLE:
rcops = &mtk_reset_ops;
break;
case MTK_RST_SET_CLR:
rcops = &mtk_reset_ops_set_clr;
break;
default:
pr_err("Unknown reset version %d\n", desc->version);
return -EINVAL;
}
regmap = device_node_to_regmap(np);
if (IS_ERR(regmap)) {
pr_err("Cannot find regmap for %pOF: %pe\n", np, regmap);
return -EINVAL;
}
data = kzalloc(sizeof(*data), GFP_KERNEL);
if (!data)
return -ENOMEM;
data->desc = desc;
data->regmap = regmap;
data->rcdev.owner = THIS_MODULE;
data->rcdev.ops = rcops;
data->rcdev.of_node = np;
if (data->desc->rst_idx_map_nr > 0) {
data->rcdev.of_reset_n_cells = 1;
data->rcdev.nr_resets = desc->rst_idx_map_nr;
data->rcdev.of_xlate = reset_xlate;
} else {
data->rcdev.nr_resets = desc->rst_bank_nr * RST_NR_PER_BANK;
}
ret = reset_controller_register(&data->rcdev);
if (ret) {
pr_err("could not register reset controller: %d\n", ret);
kfree(data);
return ret;
}
return 0;
}
int mtk_register_reset_controller_with_dev(struct device *dev,
const struct mtk_clk_rst_desc *desc)
{
struct device_node *np = dev->of_node;
struct regmap *regmap;
const struct reset_control_ops *rcops = NULL;
struct mtk_clk_rst_data *data;
int ret;
if (!desc) {
dev_err(dev, "mtk clock reset desc is NULL\n");
return -EINVAL;
}
switch (desc->version) {
case MTK_RST_SIMPLE:
rcops = &mtk_reset_ops;
break;
case MTK_RST_SET_CLR:
rcops = &mtk_reset_ops_set_clr;
break;
default:
dev_err(dev, "Unknown reset version %d\n", desc->version);
return -EINVAL;
}
regmap = device_node_to_regmap(np);
if (IS_ERR(regmap)) {
dev_err(dev, "Cannot find regmap %pe\n", regmap);
return -EINVAL;
}
data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL);
if (!data)
return -ENOMEM;
data->desc = desc;
data->regmap = regmap;
data->rcdev.owner = THIS_MODULE;
data->rcdev.ops = rcops;
data->rcdev.of_node = np;
data->rcdev.dev = dev;
if (data->desc->rst_idx_map_nr > 0) {
data->rcdev.of_reset_n_cells = 1;
data->rcdev.nr_resets = desc->rst_idx_map_nr;
data->rcdev.of_xlate = reset_xlate;
} else {
data->rcdev.nr_resets = desc->rst_bank_nr * RST_NR_PER_BANK;
}
ret = devm_reset_controller_register(dev, &data->rcdev);
if (ret) {
dev_err(dev, "could not register reset controller: %d\n", ret);
return ret;
}
return 0;
}
EXPORT_SYMBOL_GPL(mtk_register_reset_controller_with_dev);
MODULE_LICENSE("GPL");
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