1// SPDX-License-Identifier: GPL-2.0
  2/*
  3 * Copyright (C) 2020 MediaTek Inc.
  4 * Copyright (c) 2024 Collabora Ltd.
  5 *                    AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
  6 */
  7
  8#include <linux/module.h>
  9#include <linux/platform_device.h>
 10#include <linux/of.h>
 11#include <linux/regulator/driver.h>
 12#include <linux/regulator/of_regulator.h>
 13#include <linux/soc/mediatek/dvfsrc.h>
 14
 15enum dvfsrc_regulator_id {
 16	DVFSRC_ID_VCORE,
 17	DVFSRC_ID_VSCP,
 18	DVFSRC_ID_MAX
 19};
 20
 21struct dvfsrc_regulator_pdata {
 22	const struct regulator_desc *descs;
 23	u32 size;
 24};
 25
 26#define MTK_DVFSRC_VREG(match, _name, _volt_table)	\
 27{							\
 28	.name = match,					\
 29	.of_match = match,				\
 30	.ops = &dvfsrc_vcore_ops,			\
 31	.type = REGULATOR_VOLTAGE,			\
 32	.id = DVFSRC_ID_##_name,			\
 33	.owner = THIS_MODULE,				\
 34	.n_voltages = ARRAY_SIZE(_volt_table),		\
 35	.volt_table = _volt_table,			\
 36}
 37
 38static inline struct device *to_dvfs_regulator_dev(struct regulator_dev *rdev)
 39{
 40	return rdev_get_dev(rdev)->parent;
 41}
 42
 43static inline struct device *to_dvfsrc_dev(struct regulator_dev *rdev)
 44{
 45	return to_dvfs_regulator_dev(rdev)->parent;
 46}
 47
 48static int dvfsrc_get_cmd(int rdev_id, enum mtk_dvfsrc_cmd *cmd)
 49{
 50	switch (rdev_id) {
 51	case DVFSRC_ID_VCORE:
 52		*cmd = MTK_DVFSRC_CMD_VCORE_LEVEL;
 53		break;
 54	case DVFSRC_ID_VSCP:
 55		*cmd = MTK_DVFSRC_CMD_VSCP_LEVEL;
 56		break;
 57	default:
 58		return -EINVAL;
 59	}
 60
 61	return 0;
 62}
 63
 64static int dvfsrc_set_voltage_sel(struct regulator_dev *rdev,
 65				  unsigned int selector)
 66{
 67	struct device *dvfsrc_dev = to_dvfsrc_dev(rdev);
 68	enum mtk_dvfsrc_cmd req_cmd;
 69	int id = rdev_get_id(rdev);
 70	int ret;
 71
 72	ret = dvfsrc_get_cmd(id, &req_cmd);
 73	if (ret)
 74		return ret;
 75
 76	return mtk_dvfsrc_send_request(dvfsrc_dev, req_cmd, selector);
 77}
 78
 79static int dvfsrc_get_voltage_sel(struct regulator_dev *rdev)
 80{
 81	struct device *dvfsrc_dev = to_dvfsrc_dev(rdev);
 82	enum mtk_dvfsrc_cmd query_cmd;
 83	int id = rdev_get_id(rdev);
 84	int val, ret;
 85
 86	ret = dvfsrc_get_cmd(id, &query_cmd);
 87	if (ret)
 88		return ret;
 89
 90	ret = mtk_dvfsrc_query_info(dvfsrc_dev, query_cmd, &val);
 91	if (ret)
 92		return ret;
 93
 94	return val;
 95}
 96
 97static const struct regulator_ops dvfsrc_vcore_ops = {
 98	.list_voltage = regulator_list_voltage_table,
 99	.get_voltage_sel = dvfsrc_get_voltage_sel,
100	.set_voltage_sel = dvfsrc_set_voltage_sel,
101};
102
103static const unsigned int mt6873_voltages[] = {
104	575000,
105	600000,
106	650000,
107	725000,
108};
109
110static const struct regulator_desc mt6873_regulators[] = {
111	MTK_DVFSRC_VREG("dvfsrc-vcore", VCORE, mt6873_voltages),
112	MTK_DVFSRC_VREG("dvfsrc-vscp", VSCP, mt6873_voltages),
113};
114
115static const struct dvfsrc_regulator_pdata mt6873_data = {
116	.descs = mt6873_regulators,
117	.size = ARRAY_SIZE(mt6873_regulators),
118};
119
120static const unsigned int mt8183_voltages[] = {
121	725000,
122	800000,
123};
124
125static const struct regulator_desc mt8183_regulators[] = {
126	MTK_DVFSRC_VREG("dvfsrc-vcore", VCORE, mt8183_voltages),
127};
128
129static const struct dvfsrc_regulator_pdata mt8183_data = {
130	.descs = mt8183_regulators,
131	.size = ARRAY_SIZE(mt8183_regulators),
132};
133
134static const unsigned int mt8195_voltages[] = {
135	550000,
136	600000,
137	650000,
138	750000,
139};
140
141static const struct regulator_desc mt8195_regulators[] = {
142	MTK_DVFSRC_VREG("dvfsrc-vcore", VCORE, mt8195_voltages),
143	MTK_DVFSRC_VREG("dvfsrc-vscp", VSCP, mt8195_voltages),
144};
145
146static const struct dvfsrc_regulator_pdata mt8195_data = {
147	.descs = mt8195_regulators,
148	.size = ARRAY_SIZE(mt8195_regulators),
149};
150
151static int dvfsrc_vcore_regulator_probe(struct platform_device *pdev)
152{
153	struct regulator_config config = { .dev = &pdev->dev };
154	const struct dvfsrc_regulator_pdata *pdata;
155	int i;
156
157	pdata = device_get_match_data(&pdev->dev);
158	if (!pdata)
159		return -EINVAL;
160
161	for (i = 0; i < pdata->size; i++) {
162		const struct regulator_desc *vrdesc = &pdata->descs[i];
163		struct regulator_dev *rdev;
164
165		rdev = devm_regulator_register(&pdev->dev, vrdesc, &config);
166		if (IS_ERR(rdev))
167			return dev_err_probe(&pdev->dev, PTR_ERR(rdev),
168					     "failed to register %s\n", vrdesc->name);
169	}
170
171	return 0;
172}
173
174static const struct of_device_id mtk_dvfsrc_regulator_match[] = {
175	{ .compatible = "mediatek,mt6873-dvfsrc-regulator", .data = &mt6873_data },
176	{ .compatible = "mediatek,mt8183-dvfsrc-regulator", .data = &mt8183_data },
177	{ .compatible = "mediatek,mt8192-dvfsrc-regulator", .data = &mt6873_data },
178	{ .compatible = "mediatek,mt8195-dvfsrc-regulator", .data = &mt8195_data },
179	{ /* sentinel */ }
180};
181MODULE_DEVICE_TABLE(of, mtk_dvfsrc_regulator_match);
182
183static struct platform_driver mtk_dvfsrc_regulator_driver = {
184	.driver = {
185		.name  = "mtk-dvfsrc-regulator",
186		.of_match_table = mtk_dvfsrc_regulator_match,
187		.probe_type = PROBE_PREFER_ASYNCHRONOUS,
188	},
189	.probe = dvfsrc_vcore_regulator_probe,
190};
191module_platform_driver(mtk_dvfsrc_regulator_driver);
192
193MODULE_AUTHOR("AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>");
194MODULE_AUTHOR("Arvin wang <arvin.wang@mediatek.com>");
195MODULE_DESCRIPTION("MediaTek DVFS Resource Collector Regulator driver");
196MODULE_LICENSE("GPL");