143 lines
3.7 KiB
C
143 lines
3.7 KiB
C
// SPDX-License-Identifier: GPL-2.0 OR BSD-3-Clause
|
|
/*
|
|
* Amlogic Meson Reset core functions
|
|
*
|
|
* Copyright (c) 2016-2024 BayLibre, SAS.
|
|
* Authors: Neil Armstrong <narmstrong@baylibre.com>
|
|
* Jerome Brunet <jbrunet@baylibre.com>
|
|
*/
|
|
|
|
#include <linux/device.h>
|
|
#include <linux/module.h>
|
|
#include <linux/regmap.h>
|
|
#include <linux/reset-controller.h>
|
|
|
|
#include "reset-meson.h"
|
|
|
|
struct meson_reset {
|
|
const struct meson_reset_param *param;
|
|
struct reset_controller_dev rcdev;
|
|
struct regmap *map;
|
|
};
|
|
|
|
static void meson_reset_offset_and_bit(struct meson_reset *data,
|
|
unsigned long id,
|
|
unsigned int *offset,
|
|
unsigned int *bit)
|
|
{
|
|
unsigned int stride = regmap_get_reg_stride(data->map);
|
|
|
|
*offset = (id / (stride * BITS_PER_BYTE)) * stride;
|
|
*bit = id % (stride * BITS_PER_BYTE);
|
|
}
|
|
|
|
static int meson_reset_reset(struct reset_controller_dev *rcdev,
|
|
unsigned long id)
|
|
{
|
|
struct meson_reset *data =
|
|
container_of(rcdev, struct meson_reset, rcdev);
|
|
unsigned int offset, bit;
|
|
|
|
meson_reset_offset_and_bit(data, id, &offset, &bit);
|
|
offset += data->param->reset_offset;
|
|
|
|
return regmap_write(data->map, offset, BIT(bit));
|
|
}
|
|
|
|
static int meson_reset_level(struct reset_controller_dev *rcdev,
|
|
unsigned long id, bool assert)
|
|
{
|
|
struct meson_reset *data =
|
|
container_of(rcdev, struct meson_reset, rcdev);
|
|
unsigned int offset, bit;
|
|
|
|
meson_reset_offset_and_bit(data, id, &offset, &bit);
|
|
offset += data->param->level_offset;
|
|
assert ^= data->param->level_low_reset;
|
|
|
|
return regmap_update_bits(data->map, offset,
|
|
BIT(bit), assert ? BIT(bit) : 0);
|
|
}
|
|
|
|
static int meson_reset_status(struct reset_controller_dev *rcdev,
|
|
unsigned long id)
|
|
{
|
|
struct meson_reset *data =
|
|
container_of(rcdev, struct meson_reset, rcdev);
|
|
unsigned int val, offset, bit;
|
|
|
|
meson_reset_offset_and_bit(data, id, &offset, &bit);
|
|
offset += data->param->level_offset;
|
|
|
|
regmap_read(data->map, offset, &val);
|
|
val = !!(BIT(bit) & val);
|
|
|
|
return val ^ data->param->level_low_reset;
|
|
}
|
|
|
|
static int meson_reset_assert(struct reset_controller_dev *rcdev,
|
|
unsigned long id)
|
|
{
|
|
return meson_reset_level(rcdev, id, true);
|
|
}
|
|
|
|
static int meson_reset_deassert(struct reset_controller_dev *rcdev,
|
|
unsigned long id)
|
|
{
|
|
return meson_reset_level(rcdev, id, false);
|
|
}
|
|
|
|
static int meson_reset_level_toggle(struct reset_controller_dev *rcdev,
|
|
unsigned long id)
|
|
{
|
|
int ret;
|
|
|
|
ret = meson_reset_assert(rcdev, id);
|
|
if (ret)
|
|
return ret;
|
|
|
|
return meson_reset_deassert(rcdev, id);
|
|
}
|
|
|
|
const struct reset_control_ops meson_reset_ops = {
|
|
.reset = meson_reset_reset,
|
|
.assert = meson_reset_assert,
|
|
.deassert = meson_reset_deassert,
|
|
.status = meson_reset_status,
|
|
};
|
|
EXPORT_SYMBOL_NS_GPL(meson_reset_ops, "MESON_RESET");
|
|
|
|
const struct reset_control_ops meson_reset_toggle_ops = {
|
|
.reset = meson_reset_level_toggle,
|
|
.assert = meson_reset_assert,
|
|
.deassert = meson_reset_deassert,
|
|
.status = meson_reset_status,
|
|
};
|
|
EXPORT_SYMBOL_NS_GPL(meson_reset_toggle_ops, "MESON_RESET");
|
|
|
|
int meson_reset_controller_register(struct device *dev, struct regmap *map,
|
|
const struct meson_reset_param *param)
|
|
{
|
|
struct meson_reset *data;
|
|
|
|
data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL);
|
|
if (!data)
|
|
return -ENOMEM;
|
|
|
|
data->param = param;
|
|
data->map = map;
|
|
data->rcdev.owner = dev->driver->owner;
|
|
data->rcdev.nr_resets = param->reset_num;
|
|
data->rcdev.ops = data->param->reset_ops;
|
|
data->rcdev.of_node = dev->of_node;
|
|
|
|
return devm_reset_controller_register(dev, &data->rcdev);
|
|
}
|
|
EXPORT_SYMBOL_NS_GPL(meson_reset_controller_register, "MESON_RESET");
|
|
|
|
MODULE_DESCRIPTION("Amlogic Meson Reset Core function");
|
|
MODULE_AUTHOR("Neil Armstrong <narmstrong@baylibre.com>");
|
|
MODULE_AUTHOR("Jerome Brunet <jbrunet@baylibre.com>");
|
|
MODULE_LICENSE("Dual BSD/GPL");
|
|
MODULE_IMPORT_NS("MESON_RESET");
|