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// SPDX-License-Identifier: GPL-2.0
//
// Copyright (c) 2020 MediaTek Inc.
#include <linux/err.h>
#include <linux/init.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/of_device.h>
#include <linux/of_platform.h>
#include <linux/regulator/driver.h>
#include <linux/regulator/of_regulator.h>
#include <linux/soc/mediatek/mtk_dvfsrc.h>
#define DVFSRC_ID_VCORE 0
#define DVFSRC_ID_VSCP 1
#define MT_DVFSRC_REGULAR(match, _name, _volt_table) \
[DVFSRC_ID_##_name] = { \
.desc = { \
.name = match, \
.of_match = of_match_ptr(match), \
.ops = &dvfsrc_vcore_ops, \
.type = REGULATOR_VOLTAGE, \
.id = DVFSRC_ID_##_name, \
.owner = THIS_MODULE, \
.n_voltages = ARRAY_SIZE(_volt_table), \
.volt_table = _volt_table, \
}, \
}
/*
* DVFSRC regulators' information
*
* @desc: standard fields of regulator description.
* @voltage_selector: Selector used for get_voltage_sel() and
* set_voltage_sel() callbacks
*/
struct dvfsrc_regulator {
struct regulator_desc desc;
};
/*
* MTK DVFSRC regulators' init data
*
* @size: num of regulators
* @regulator_info: regulator info.
*/
struct dvfsrc_regulator_init_data {
u32 size;
struct dvfsrc_regulator *regulator_info;
};
static inline struct device *to_dvfsrc_dev(struct regulator_dev *rdev)
{
return rdev_get_dev(rdev)->parent;
}
static int dvfsrc_set_voltage_sel(struct regulator_dev *rdev,
unsigned int selector)
{
struct device *dvfsrc_dev = to_dvfsrc_dev(rdev);
int id = rdev_get_id(rdev);
if (id == DVFSRC_ID_VCORE)
mtk_dvfsrc_send_request(dvfsrc_dev,
MTK_DVFSRC_CMD_VCORE_REQUEST,
selector);
else if (id == DVFSRC_ID_VSCP)
mtk_dvfsrc_send_request(dvfsrc_dev,
MTK_DVFSRC_CMD_VSCP_REQUEST,
selector);
else
return -EINVAL;
return 0;
}
static int dvfsrc_get_voltage_sel(struct regulator_dev *rdev)
{
struct device *dvfsrc_dev = to_dvfsrc_dev(rdev);
int id = rdev_get_id(rdev);
int val, ret;
if (id == DVFSRC_ID_VCORE)
ret = mtk_dvfsrc_query_info(dvfsrc_dev,
MTK_DVFSRC_CMD_VCORE_LEVEL_QUERY,
&val);
else if (id == DVFSRC_ID_VSCP)
ret = mtk_dvfsrc_query_info(dvfsrc_dev,
MTK_DVFSRC_CMD_VSCP_LEVEL_QUERY,
&val);
else
return -EINVAL;
if (ret != 0)
return ret;
return val;
}
static const struct regulator_ops dvfsrc_vcore_ops = {
.list_voltage = regulator_list_voltage_table,
.get_voltage_sel = dvfsrc_get_voltage_sel,
.set_voltage_sel = dvfsrc_set_voltage_sel,
};
static const unsigned int mt8183_voltages[] = {
725000,
800000,
};
static struct dvfsrc_regulator mt8183_regulators[] = {
MT_DVFSRC_REGULAR("dvfsrc-vcore", VCORE,
mt8183_voltages),
};
static const struct dvfsrc_regulator_init_data regulator_mt8183_data = {
.size = ARRAY_SIZE(mt8183_regulators),
.regulator_info = &mt8183_regulators[0],
};
static const unsigned int mt6873_voltages[] = {
575000,
600000,
650000,
725000,
};
static struct dvfsrc_regulator mt6873_regulators[] = {
MT_DVFSRC_REGULAR("dvfsrc-vcore", VCORE,
mt6873_voltages),
MT_DVFSRC_REGULAR("dvfsrc-vscp", VSCP,
mt6873_voltages),
};
static const struct dvfsrc_regulator_init_data regulator_mt6873_data = {
.size = ARRAY_SIZE(mt6873_regulators),
.regulator_info = &mt6873_regulators[0],
};
static const struct of_device_id mtk_dvfsrc_regulator_match[] = {
{
.compatible = "mediatek,mt8183-dvfsrc",
.data = ®ulator_mt8183_data,
}, {
.compatible = "mediatek,mt8192-dvfsrc",
.data = ®ulator_mt6873_data,
}, {
.compatible = "mediatek,mt6873-dvfsrc",
.data = ®ulator_mt6873_data,
}, {
/* sentinel */
},
};
MODULE_DEVICE_TABLE(of, mtk_dvfsrc_regulator_match);
static int dvfsrc_vcore_regulator_probe(struct platform_device *pdev)
{
const struct of_device_id *match;
struct device *dev = &pdev->dev;
struct regulator_config config = { };
struct regulator_dev *rdev;
const struct dvfsrc_regulator_init_data *regulator_init_data;
struct dvfsrc_regulator *mt_regulators;
int i;
match = of_match_node(mtk_dvfsrc_regulator_match, dev->parent->of_node);
if (!match) {
dev_err(dev, "invalid compatible string\n");
return -ENODEV;
}
regulator_init_data = match->data;
mt_regulators = regulator_init_data->regulator_info;
for (i = 0; i < regulator_init_data->size; i++) {
config.dev = dev->parent;
config.driver_data = (mt_regulators + i);
rdev = devm_regulator_register(dev->parent,
&(mt_regulators + i)->desc,
&config);
if (IS_ERR(rdev)) {
dev_err(dev, "failed to register %s\n",
(mt_regulators + i)->desc.name);
return PTR_ERR(rdev);
}
}
return 0;
}
static struct platform_driver mtk_dvfsrc_regulator_driver = {
.driver = {
.name = "mtk-dvfsrc-regulator",
},
.probe = dvfsrc_vcore_regulator_probe,
};
static int __init mtk_dvfsrc_regulator_init(void)
{
return platform_driver_register(&mtk_dvfsrc_regulator_driver);
}
subsys_initcall(mtk_dvfsrc_regulator_init);
static void __exit mtk_dvfsrc_regulator_exit(void)
{
platform_driver_unregister(&mtk_dvfsrc_regulator_driver);
}
module_exit(mtk_dvfsrc_regulator_exit);
MODULE_AUTHOR("Arvin wang <arvin.wang@mediatek.com>");
MODULE_LICENSE("GPL v2");
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