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 struct pbias_of_data {
51 static const unsigned int pbias_volt_table[] = {
56 static struct regulator_ops pbias_regulator_voltage_ops = {
57 .list_voltage = regulator_list_voltage_table,
58 .get_voltage_sel = regulator_get_voltage_sel_regmap,
59 .set_voltage_sel = regulator_set_voltage_sel_regmap,
60 .enable = regulator_enable_regmap,
61 .disable = regulator_disable_regmap,
62 .is_enabled = regulator_is_enabled_regmap,
65 static const struct pbias_reg_info pbias_mmc_omap2430 = {
67 .enable_mask = BIT(1),
70 .name = "pbias_mmc_omap2430"
73 static const struct pbias_reg_info pbias_sim_omap3 = {
75 .enable_mask = BIT(9),
78 .name = "pbias_sim_omap3"
81 static const struct pbias_reg_info pbias_mmc_omap4 = {
82 .enable = BIT(26) | BIT(22),
83 .enable_mask = BIT(26) | BIT(25) | BIT(22),
86 .name = "pbias_mmc_omap4"
89 static const struct pbias_reg_info pbias_mmc_omap5 = {
90 .enable = BIT(27) | BIT(26),
91 .enable_mask = BIT(27) | BIT(25) | BIT(26),
94 .name = "pbias_mmc_omap5"
97 static struct of_regulator_match pbias_matches[] = {
98 { .name = "pbias_mmc_omap2430", .driver_data = (void *)&pbias_mmc_omap2430},
99 { .name = "pbias_sim_omap3", .driver_data = (void *)&pbias_sim_omap3},
100 { .name = "pbias_mmc_omap4", .driver_data = (void *)&pbias_mmc_omap4},
101 { .name = "pbias_mmc_omap5", .driver_data = (void *)&pbias_mmc_omap5},
103 #define PBIAS_NUM_REGS ARRAY_SIZE(pbias_matches)
105 /* Offset from SCM general area (and syscon) base */
107 static const struct pbias_of_data pbias_of_data_omap2 = {
111 static const struct pbias_of_data pbias_of_data_omap3 = {
115 static const struct pbias_of_data pbias_of_data_omap4 = {
119 static const struct pbias_of_data pbias_of_data_omap5 = {
123 static const struct pbias_of_data pbias_of_data_dra7 = {
127 static const struct of_device_id pbias_of_match[] = {
128 { .compatible = "ti,pbias-omap", },
129 { .compatible = "ti,pbias-omap2", .data = &pbias_of_data_omap2, },
130 { .compatible = "ti,pbias-omap3", .data = &pbias_of_data_omap3, },
131 { .compatible = "ti,pbias-omap4", .data = &pbias_of_data_omap4, },
132 { .compatible = "ti,pbias-omap5", .data = &pbias_of_data_omap5, },
133 { .compatible = "ti,pbias-dra7", .data = &pbias_of_data_dra7, },
136 MODULE_DEVICE_TABLE(of, pbias_of_match);
138 static int pbias_regulator_probe(struct platform_device *pdev)
140 struct device_node *np = pdev->dev.of_node;
141 struct pbias_regulator_data *drvdata;
142 struct resource *res;
143 struct regulator_config cfg = { };
144 struct regmap *syscon;
145 const struct pbias_reg_info *info;
147 int count, idx, data_idx = 0;
148 const struct of_device_id *match;
149 const struct pbias_of_data *data;
152 count = of_regulator_match(&pdev->dev, np, pbias_matches,
157 drvdata = devm_kzalloc(&pdev->dev, sizeof(struct pbias_regulator_data)
158 * count, GFP_KERNEL);
162 syscon = syscon_regmap_lookup_by_phandle(np, "syscon");
164 return PTR_ERR(syscon);
166 match = of_match_device(of_match_ptr(pbias_of_match), &pdev->dev);
167 if (match && match->data) {
169 offset = data->offset;
171 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
177 "using legacy dt data for pbias offset\n");
181 cfg.dev = &pdev->dev;
183 for (idx = 0; idx < PBIAS_NUM_REGS && data_idx < count; idx++) {
184 if (!pbias_matches[idx].init_data ||
185 !pbias_matches[idx].of_node)
188 info = pbias_matches[idx].driver_data;
192 drvdata[data_idx].syscon = syscon;
193 drvdata[data_idx].info = info;
194 drvdata[data_idx].desc.name = info->name;
195 drvdata[data_idx].desc.owner = THIS_MODULE;
196 drvdata[data_idx].desc.type = REGULATOR_VOLTAGE;
197 drvdata[data_idx].desc.ops = &pbias_regulator_voltage_ops;
198 drvdata[data_idx].desc.volt_table = pbias_volt_table;
199 drvdata[data_idx].desc.n_voltages = 2;
200 drvdata[data_idx].desc.enable_time = info->enable_time;
201 drvdata[data_idx].desc.vsel_reg = offset;
202 drvdata[data_idx].desc.vsel_mask = info->vmode;
203 drvdata[data_idx].desc.enable_reg = offset;
204 drvdata[data_idx].desc.enable_mask = info->enable_mask;
205 drvdata[data_idx].desc.enable_val = info->enable;
207 cfg.init_data = pbias_matches[idx].init_data;
208 cfg.driver_data = &drvdata[data_idx];
209 cfg.of_node = pbias_matches[idx].of_node;
211 drvdata[data_idx].dev = devm_regulator_register(&pdev->dev,
212 &drvdata[data_idx].desc, &cfg);
213 if (IS_ERR(drvdata[data_idx].dev)) {
214 ret = PTR_ERR(drvdata[data_idx].dev);
216 "Failed to register regulator: %d\n", ret);
222 platform_set_drvdata(pdev, drvdata);
228 static struct platform_driver pbias_regulator_driver = {
229 .probe = pbias_regulator_probe,
231 .name = "pbias-regulator",
232 .of_match_table = of_match_ptr(pbias_of_match),
236 module_platform_driver(pbias_regulator_driver);
238 MODULE_AUTHOR("Balaji T K <balajitk@ti.com>");
239 MODULE_DESCRIPTION("pbias voltage regulator");
240 MODULE_LICENSE("GPL");
241 MODULE_ALIAS("platform:pbias-regulator");