diff options
Diffstat (limited to 'drivers/regulator/mtk-dvfsrc-regulator.c')
| -rw-r--r-- | drivers/regulator/mtk-dvfsrc-regulator.c | 214 |
1 files changed, 214 insertions, 0 deletions
diff --git a/drivers/regulator/mtk-dvfsrc-regulator.c b/drivers/regulator/mtk-dvfsrc-regulator.c new file mode 100644 index 000000000..234af3a66 --- /dev/null +++ b/drivers/regulator/mtk-dvfsrc-regulator.c @@ -0,0 +1,214 @@ +// 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, &(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"); |