mirror of
https://github.com/torvalds/linux.git
synced 2024-12-06 19:11:31 +00:00
7cbe5cb291
In order to compile the clock drivers for various MediaTek SoCs as modules, it is necessary to export a few functions from the MediaTek specific clocks (and reset) libraries. Signed-off-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com> Reviewed-by: Miles Chen <miles.chen@mediatek.com> Link: https://lore.kernel.org/r/20220921091455.41327-7-angelogioacchino.delregno@collabora.com Signed-off-by: Chen-Yu Tsai <wenst@chromium.org>
234 lines
5.4 KiB
C
234 lines
5.4 KiB
C
// 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");
|