| /* |
| * pbias-regulator.c |
| * |
| * Copyright (C) 2014 Texas Instruments Incorporated - http://www.ti.com/ |
| * Author: Balaji T K <balajitk@ti.com> |
| * |
| * This program is free software; you can redistribute it and/or |
| * modify it under the terms of the GNU General Public License as |
| * published by the Free Software Foundation version 2. |
| * |
| * This program is distributed "as is" WITHOUT ANY WARRANTY of any |
| * kind, whether express or implied; without even the implied warranty |
| * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| * GNU General Public License for more details. |
| */ |
| |
| #include <linux/err.h> |
| #include <linux/io.h> |
| #include <linux/module.h> |
| #include <linux/mfd/syscon.h> |
| #include <linux/platform_device.h> |
| #include <linux/regulator/driver.h> |
| #include <linux/regulator/machine.h> |
| #include <linux/regulator/of_regulator.h> |
| #include <linux/regmap.h> |
| #include <linux/slab.h> |
| #include <linux/of.h> |
| #include <linux/of_device.h> |
| |
| struct pbias_reg_info { |
| u32 enable; |
| u32 enable_mask; |
| u32 vmode; |
| unsigned int enable_time; |
| char *name; |
| }; |
| |
| struct pbias_regulator_data { |
| struct regulator_desc desc; |
| void __iomem *pbias_addr; |
| unsigned int pbias_reg; |
| struct regulator_dev *dev; |
| struct regmap *syscon; |
| const struct pbias_reg_info *info; |
| int voltage; |
| }; |
| |
| static int pbias_regulator_set_voltage(struct regulator_dev *dev, |
| int min_uV, int max_uV, unsigned *selector) |
| { |
| struct pbias_regulator_data *data = rdev_get_drvdata(dev); |
| const struct pbias_reg_info *info = data->info; |
| int ret, vmode; |
| |
| if (min_uV <= 1800000) |
| vmode = 0; |
| else if (min_uV > 1800000) |
| vmode = info->vmode; |
| |
| ret = regmap_update_bits(data->syscon, data->pbias_reg, |
| info->vmode, vmode); |
| |
| return ret; |
| } |
| |
| static int pbias_regulator_get_voltage(struct regulator_dev *rdev) |
| { |
| struct pbias_regulator_data *data = rdev_get_drvdata(rdev); |
| const struct pbias_reg_info *info = data->info; |
| int value, voltage; |
| |
| regmap_read(data->syscon, data->pbias_reg, &value); |
| value &= info->vmode; |
| |
| voltage = value ? 3000000 : 1800000; |
| |
| return voltage; |
| } |
| |
| static int pbias_regulator_enable(struct regulator_dev *rdev) |
| { |
| struct pbias_regulator_data *data = rdev_get_drvdata(rdev); |
| const struct pbias_reg_info *info = data->info; |
| int ret; |
| |
| ret = regmap_update_bits(data->syscon, data->pbias_reg, |
| info->enable_mask, info->enable); |
| |
| return ret; |
| } |
| |
| static int pbias_regulator_disable(struct regulator_dev *rdev) |
| { |
| struct pbias_regulator_data *data = rdev_get_drvdata(rdev); |
| const struct pbias_reg_info *info = data->info; |
| int ret; |
| |
| ret = regmap_update_bits(data->syscon, data->pbias_reg, |
| info->enable_mask, 0); |
| return ret; |
| } |
| |
| static int pbias_regulator_is_enable(struct regulator_dev *rdev) |
| { |
| struct pbias_regulator_data *data = rdev_get_drvdata(rdev); |
| const struct pbias_reg_info *info = data->info; |
| int value; |
| |
| regmap_read(data->syscon, data->pbias_reg, &value); |
| |
| return (value & info->enable_mask) == info->enable; |
| } |
| |
| static struct regulator_ops pbias_regulator_voltage_ops = { |
| .set_voltage = pbias_regulator_set_voltage, |
| .get_voltage = pbias_regulator_get_voltage, |
| .enable = pbias_regulator_enable, |
| .disable = pbias_regulator_disable, |
| .is_enabled = pbias_regulator_is_enable, |
| }; |
| |
| static const struct pbias_reg_info pbias_mmc_omap2430 = { |
| .enable = BIT(1), |
| .enable_mask = BIT(1), |
| .vmode = BIT(0), |
| .enable_time = 100, |
| .name = "pbias_mmc_omap2430" |
| }; |
| |
| static const struct pbias_reg_info pbias_sim_omap3 = { |
| .enable = BIT(9), |
| .enable_mask = BIT(9), |
| .vmode = BIT(8), |
| .enable_time = 100, |
| .name = "pbias_sim_omap3" |
| }; |
| |
| static const struct pbias_reg_info pbias_mmc_omap4 = { |
| .enable = BIT(26) | BIT(22), |
| .enable_mask = BIT(26) | BIT(25) | BIT(22), |
| .vmode = BIT(21), |
| .enable_time = 100, |
| .name = "pbias_mmc_omap4" |
| }; |
| |
| static const struct pbias_reg_info pbias_mmc_omap5 = { |
| .enable = BIT(27) | BIT(26), |
| .enable_mask = BIT(27) | BIT(25) | BIT(26), |
| .vmode = BIT(21), |
| .enable_time = 100, |
| .name = "pbias_mmc_omap5" |
| }; |
| |
| static struct of_regulator_match pbias_matches[] = { |
| { .name = "pbias_mmc_omap2430", .driver_data = (void *)&pbias_mmc_omap2430}, |
| { .name = "pbias_sim_omap3", .driver_data = (void *)&pbias_sim_omap3}, |
| { .name = "pbias_mmc_omap4", .driver_data = (void *)&pbias_mmc_omap4}, |
| { .name = "pbias_mmc_omap5", .driver_data = (void *)&pbias_mmc_omap5}, |
| }; |
| #define PBIAS_NUM_REGS ARRAY_SIZE(pbias_matches) |
| |
| static const struct of_device_id pbias_of_match[] = { |
| { .compatible = "ti,pbias-omap", }, |
| {}, |
| }; |
| MODULE_DEVICE_TABLE(of, pbias_of_match); |
| |
| static int pbias_regulator_probe(struct platform_device *pdev) |
| { |
| struct device_node *np = pdev->dev.of_node; |
| struct pbias_regulator_data *drvdata; |
| struct resource *res; |
| struct regulator_config cfg = { }; |
| struct regmap *syscon; |
| const struct pbias_reg_info *info; |
| int ret = 0; |
| int count, idx, data_idx = 0; |
| |
| count = of_regulator_match(&pdev->dev, np, pbias_matches, |
| PBIAS_NUM_REGS); |
| if (count < 0) |
| return count; |
| |
| drvdata = devm_kzalloc(&pdev->dev, sizeof(struct pbias_regulator_data) |
| * count, GFP_KERNEL); |
| if (drvdata == NULL) { |
| dev_err(&pdev->dev, "Failed to allocate device data\n"); |
| return -ENOMEM; |
| } |
| |
| syscon = syscon_regmap_lookup_by_phandle(np, "syscon"); |
| if (IS_ERR(syscon)) |
| return PTR_ERR(syscon); |
| |
| cfg.dev = &pdev->dev; |
| |
| for (idx = 0; idx < PBIAS_NUM_REGS && data_idx < count; idx++) { |
| if (!pbias_matches[idx].init_data || |
| !pbias_matches[idx].of_node) |
| continue; |
| |
| info = pbias_matches[idx].driver_data; |
| if (!info) |
| return -ENODEV; |
| |
| res = platform_get_resource(pdev, IORESOURCE_MEM, 0); |
| if (!res) |
| return -EINVAL; |
| |
| drvdata[data_idx].pbias_reg = res->start; |
| drvdata[data_idx].syscon = syscon; |
| drvdata[data_idx].info = info; |
| drvdata[data_idx].desc.name = info->name; |
| drvdata[data_idx].desc.owner = THIS_MODULE; |
| drvdata[data_idx].desc.type = REGULATOR_VOLTAGE; |
| drvdata[data_idx].desc.ops = &pbias_regulator_voltage_ops; |
| drvdata[data_idx].desc.n_voltages = 2; |
| drvdata[data_idx].desc.enable_time = info->enable_time; |
| |
| cfg.init_data = pbias_matches[idx].init_data; |
| cfg.driver_data = &drvdata[data_idx]; |
| cfg.of_node = pbias_matches[idx].of_node; |
| |
| drvdata[data_idx].dev = devm_regulator_register(&pdev->dev, |
| &drvdata[data_idx].desc, &cfg); |
| if (IS_ERR(drvdata[data_idx].dev)) { |
| ret = PTR_ERR(drvdata[data_idx].dev); |
| dev_err(&pdev->dev, |
| "Failed to register regulator: %d\n", ret); |
| goto err_regulator; |
| } |
| data_idx++; |
| } |
| |
| platform_set_drvdata(pdev, drvdata); |
| |
| err_regulator: |
| return ret; |
| } |
| |
| static struct platform_driver pbias_regulator_driver = { |
| .probe = pbias_regulator_probe, |
| .driver = { |
| .name = "pbias-regulator", |
| .owner = THIS_MODULE, |
| .of_match_table = of_match_ptr(pbias_of_match), |
| }, |
| }; |
| |
| module_platform_driver(pbias_regulator_driver); |
| |
| MODULE_AUTHOR("Balaji T K <balajitk@ti.com>"); |
| MODULE_DESCRIPTION("pbias voltage regulator"); |
| MODULE_LICENSE("GPL"); |
| MODULE_ALIAS("platform:pbias-regulator"); |