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 {
35 unsigned int enable_time;
39 struct pbias_regulator_data {
40 struct regulator_desc desc;
41 void __iomem *pbias_addr;
42 struct regulator_dev *dev;
43 struct regmap *syscon;
44 const struct pbias_reg_info *info;
48 struct pbias_of_data {
52 static const unsigned int pbias_volt_table[] = {
57 static struct regulator_ops pbias_regulator_voltage_ops = {
58 .list_voltage = regulator_list_voltage_table,
59 .get_voltage_sel = regulator_get_voltage_sel_regmap,
60 .set_voltage_sel = regulator_set_voltage_sel_regmap,
61 .enable = regulator_enable_regmap,
62 .disable = regulator_disable_regmap,
63 .is_enabled = regulator_is_enabled_regmap,
66 static const struct pbias_reg_info pbias_mmc_omap2430 = {
68 .enable_mask = BIT(1),
72 .name = "pbias_mmc_omap2430"
75 static const struct pbias_reg_info pbias_sim_omap3 = {
77 .enable_mask = BIT(9),
80 .name = "pbias_sim_omap3"
83 static const struct pbias_reg_info pbias_mmc_omap4 = {
84 .enable = BIT(26) | BIT(22),
85 .enable_mask = BIT(26) | BIT(25) | BIT(22),
86 .disable_val = BIT(25),
89 .name = "pbias_mmc_omap4"
92 static const struct pbias_reg_info pbias_mmc_omap5 = {
93 .enable = BIT(27) | BIT(26),
94 .enable_mask = BIT(27) | BIT(25) | BIT(26),
95 .disable_val = BIT(25),
98 .name = "pbias_mmc_omap5"
101 static struct of_regulator_match pbias_matches[] = {
102 { .name = "pbias_mmc_omap2430", .driver_data = (void *)&pbias_mmc_omap2430},
103 { .name = "pbias_sim_omap3", .driver_data = (void *)&pbias_sim_omap3},
104 { .name = "pbias_mmc_omap4", .driver_data = (void *)&pbias_mmc_omap4},
105 { .name = "pbias_mmc_omap5", .driver_data = (void *)&pbias_mmc_omap5},
107 #define PBIAS_NUM_REGS ARRAY_SIZE(pbias_matches)
109 /* Offset from SCM general area (and syscon) base */
111 static const struct pbias_of_data pbias_of_data_omap2 = {
115 static const struct pbias_of_data pbias_of_data_omap3 = {
119 static const struct pbias_of_data pbias_of_data_omap4 = {
123 static const struct pbias_of_data pbias_of_data_omap5 = {
127 static const struct pbias_of_data pbias_of_data_dra7 = {
131 static const struct of_device_id pbias_of_match[] = {
132 { .compatible = "ti,pbias-omap", },
133 { .compatible = "ti,pbias-omap2", .data = &pbias_of_data_omap2, },
134 { .compatible = "ti,pbias-omap3", .data = &pbias_of_data_omap3, },
135 { .compatible = "ti,pbias-omap4", .data = &pbias_of_data_omap4, },
136 { .compatible = "ti,pbias-omap5", .data = &pbias_of_data_omap5, },
137 { .compatible = "ti,pbias-dra7", .data = &pbias_of_data_dra7, },
140 MODULE_DEVICE_TABLE(of, pbias_of_match);
142 static int pbias_regulator_probe(struct platform_device *pdev)
144 struct device_node *np = pdev->dev.of_node;
145 struct pbias_regulator_data *drvdata;
146 struct resource *res;
147 struct regulator_config cfg = { };
148 struct regmap *syscon;
149 const struct pbias_reg_info *info;
151 int count, idx, data_idx = 0;
152 const struct of_device_id *match;
153 const struct pbias_of_data *data;
156 count = of_regulator_match(&pdev->dev, np, pbias_matches,
161 drvdata = devm_kzalloc(&pdev->dev, sizeof(struct pbias_regulator_data)
162 * count, GFP_KERNEL);
166 syscon = syscon_regmap_lookup_by_phandle(np, "syscon");
168 return PTR_ERR(syscon);
170 match = of_match_device(of_match_ptr(pbias_of_match), &pdev->dev);
171 if (match && match->data) {
173 offset = data->offset;
175 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
181 "using legacy dt data for pbias offset\n");
185 cfg.dev = &pdev->dev;
187 for (idx = 0; idx < PBIAS_NUM_REGS && data_idx < count; idx++) {
188 if (!pbias_matches[idx].init_data ||
189 !pbias_matches[idx].of_node)
192 info = pbias_matches[idx].driver_data;
196 drvdata[data_idx].syscon = syscon;
197 drvdata[data_idx].info = info;
198 drvdata[data_idx].desc.name = info->name;
199 drvdata[data_idx].desc.owner = THIS_MODULE;
200 drvdata[data_idx].desc.type = REGULATOR_VOLTAGE;
201 drvdata[data_idx].desc.ops = &pbias_regulator_voltage_ops;
202 drvdata[data_idx].desc.volt_table = pbias_volt_table;
203 drvdata[data_idx].desc.n_voltages = 2;
204 drvdata[data_idx].desc.enable_time = info->enable_time;
205 drvdata[data_idx].desc.vsel_reg = offset;
206 drvdata[data_idx].desc.vsel_mask = info->vmode;
207 drvdata[data_idx].desc.enable_reg = offset;
208 drvdata[data_idx].desc.enable_mask = info->enable_mask;
209 drvdata[data_idx].desc.enable_val = info->enable;
210 drvdata[data_idx].desc.disable_val = info->disable_val;
212 cfg.init_data = pbias_matches[idx].init_data;
213 cfg.driver_data = &drvdata[data_idx];
214 cfg.of_node = pbias_matches[idx].of_node;
216 drvdata[data_idx].dev = devm_regulator_register(&pdev->dev,
217 &drvdata[data_idx].desc, &cfg);
218 if (IS_ERR(drvdata[data_idx].dev)) {
219 ret = PTR_ERR(drvdata[data_idx].dev);
221 "Failed to register regulator: %d\n", ret);
227 platform_set_drvdata(pdev, drvdata);
233 static struct platform_driver pbias_regulator_driver = {
234 .probe = pbias_regulator_probe,
236 .name = "pbias-regulator",
237 .of_match_table = of_match_ptr(pbias_of_match),
241 module_platform_driver(pbias_regulator_driver);
243 MODULE_AUTHOR("Balaji T K <balajitk@ti.com>");
244 MODULE_DESCRIPTION("pbias voltage regulator");
245 MODULE_LICENSE("GPL");
246 MODULE_ALIAS("platform:pbias-regulator");