4 * Copyright (C) 2014 Texas Instruments Incorporated - http://www.ti.com/
5 * Author: Balaji T K <balajitk@ti.com>
7 * This program is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU General Public License as
9 * published by the Free Software Foundation version 2.
11 * This program is distributed "as is" WITHOUT ANY WARRANTY of any
12 * kind, whether express or implied; without even the implied warranty
13 * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
17 #include <linux/err.h>
19 #include <linux/module.h>
20 #include <linux/mfd/syscon.h>
21 #include <linux/platform_device.h>
22 #include <linux/regulator/driver.h>
23 #include <linux/regulator/machine.h>
24 #include <linux/regulator/of_regulator.h>
25 #include <linux/regmap.h>
26 #include <linux/slab.h>
28 #include <linux/of_device.h>
30 struct pbias_reg_info {
34 unsigned int enable_time;
38 struct pbias_regulator_data {
39 struct regulator_desc desc;
40 void __iomem *pbias_addr;
41 struct regulator_dev *dev;
42 struct regmap *syscon;
43 const struct pbias_reg_info *info;
47 static const unsigned int pbias_volt_table[] = {
52 static int pbias_regulator_enable(struct regulator_dev *rdev)
54 struct pbias_regulator_data *data = rdev_get_drvdata(rdev);
55 const struct pbias_reg_info *info = data->info;
57 return regmap_update_bits(data->syscon, rdev->desc->enable_reg,
58 info->enable_mask, info->enable);
61 static int pbias_regulator_is_enable(struct regulator_dev *rdev)
63 struct pbias_regulator_data *data = rdev_get_drvdata(rdev);
64 const struct pbias_reg_info *info = data->info;
67 regmap_read(data->syscon, rdev->desc->enable_reg, &value);
69 return (value & info->enable_mask) == info->enable;
72 static struct regulator_ops pbias_regulator_voltage_ops = {
73 .list_voltage = regulator_list_voltage_table,
74 .get_voltage_sel = regulator_get_voltage_sel_regmap,
75 .set_voltage_sel = regulator_set_voltage_sel_regmap,
76 .enable = pbias_regulator_enable,
77 .disable = regulator_disable_regmap,
78 .is_enabled = pbias_regulator_is_enable,
81 static const struct pbias_reg_info pbias_mmc_omap2430 = {
83 .enable_mask = BIT(1),
86 .name = "pbias_mmc_omap2430"
89 static const struct pbias_reg_info pbias_sim_omap3 = {
91 .enable_mask = BIT(9),
94 .name = "pbias_sim_omap3"
97 static const struct pbias_reg_info pbias_mmc_omap4 = {
98 .enable = BIT(26) | BIT(22),
99 .enable_mask = BIT(26) | BIT(25) | BIT(22),
102 .name = "pbias_mmc_omap4"
105 static const struct pbias_reg_info pbias_mmc_omap5 = {
106 .enable = BIT(27) | BIT(26),
107 .enable_mask = BIT(27) | BIT(25) | BIT(26),
110 .name = "pbias_mmc_omap5"
113 static struct of_regulator_match pbias_matches[] = {
114 { .name = "pbias_mmc_omap2430", .driver_data = (void *)&pbias_mmc_omap2430},
115 { .name = "pbias_sim_omap3", .driver_data = (void *)&pbias_sim_omap3},
116 { .name = "pbias_mmc_omap4", .driver_data = (void *)&pbias_mmc_omap4},
117 { .name = "pbias_mmc_omap5", .driver_data = (void *)&pbias_mmc_omap5},
119 #define PBIAS_NUM_REGS ARRAY_SIZE(pbias_matches)
121 static const struct of_device_id pbias_of_match[] = {
122 { .compatible = "ti,pbias-omap", },
125 MODULE_DEVICE_TABLE(of, pbias_of_match);
127 static int pbias_regulator_probe(struct platform_device *pdev)
129 struct device_node *np = pdev->dev.of_node;
130 struct pbias_regulator_data *drvdata;
131 struct resource *res;
132 struct regulator_config cfg = { };
133 struct regmap *syscon;
134 const struct pbias_reg_info *info;
136 int count, idx, data_idx = 0;
138 count = of_regulator_match(&pdev->dev, np, pbias_matches,
143 drvdata = devm_kzalloc(&pdev->dev, sizeof(struct pbias_regulator_data)
144 * count, GFP_KERNEL);
145 if (drvdata == NULL) {
146 dev_err(&pdev->dev, "Failed to allocate device data\n");
150 syscon = syscon_regmap_lookup_by_phandle(np, "syscon");
152 return PTR_ERR(syscon);
155 cfg.dev = &pdev->dev;
157 for (idx = 0; idx < PBIAS_NUM_REGS && data_idx < count; idx++) {
158 if (!pbias_matches[idx].init_data ||
159 !pbias_matches[idx].of_node)
162 info = pbias_matches[idx].driver_data;
166 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
170 drvdata[data_idx].syscon = syscon;
171 drvdata[data_idx].info = info;
172 drvdata[data_idx].desc.name = info->name;
173 drvdata[data_idx].desc.owner = THIS_MODULE;
174 drvdata[data_idx].desc.type = REGULATOR_VOLTAGE;
175 drvdata[data_idx].desc.ops = &pbias_regulator_voltage_ops;
176 drvdata[data_idx].desc.volt_table = pbias_volt_table;
177 drvdata[data_idx].desc.n_voltages = 2;
178 drvdata[data_idx].desc.enable_time = info->enable_time;
179 drvdata[data_idx].desc.vsel_reg = res->start;
180 drvdata[data_idx].desc.vsel_mask = info->vmode;
181 drvdata[data_idx].desc.enable_reg = res->start;
182 drvdata[data_idx].desc.enable_mask = info->enable_mask;
184 cfg.init_data = pbias_matches[idx].init_data;
185 cfg.driver_data = &drvdata[data_idx];
186 cfg.of_node = pbias_matches[idx].of_node;
188 drvdata[data_idx].dev = devm_regulator_register(&pdev->dev,
189 &drvdata[data_idx].desc, &cfg);
190 if (IS_ERR(drvdata[data_idx].dev)) {
191 ret = PTR_ERR(drvdata[data_idx].dev);
193 "Failed to register regulator: %d\n", ret);
199 platform_set_drvdata(pdev, drvdata);
205 static struct platform_driver pbias_regulator_driver = {
206 .probe = pbias_regulator_probe,
208 .name = "pbias-regulator",
209 .owner = THIS_MODULE,
210 .of_match_table = of_match_ptr(pbias_of_match),
214 module_platform_driver(pbias_regulator_driver);
216 MODULE_AUTHOR("Balaji T K <balajitk@ti.com>");
217 MODULE_DESCRIPTION("pbias voltage regulator");
218 MODULE_LICENSE("GPL");
219 MODULE_ALIAS("platform:pbias-regulator");