blob: ded3b35742091dac92192c45f1c0e7f24565f924 [file] [log] [blame]
Balaji T K11469e02014-02-19 20:26:40 +05301/*
2 * pbias-regulator.c
3 *
4 * Copyright (C) 2014 Texas Instruments Incorporated - http://www.ti.com/
5 * Author: Balaji T K <balajitk@ti.com>
6 *
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.
10 *
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.
15 */
16
17#include <linux/err.h>
18#include <linux/io.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>
27#include <linux/of.h>
28#include <linux/of_device.h>
29
30struct pbias_reg_info {
31 u32 enable;
32 u32 enable_mask;
33 u32 vmode;
34 unsigned int enable_time;
35 char *name;
36};
37
38struct pbias_regulator_data {
39 struct regulator_desc desc;
40 void __iomem *pbias_addr;
41 unsigned int pbias_reg;
42 struct regulator_dev *dev;
43 struct regmap *syscon;
44 const struct pbias_reg_info *info;
45 int voltage;
46};
47
48static int pbias_regulator_set_voltage(struct regulator_dev *dev,
49 int min_uV, int max_uV, unsigned *selector)
50{
51 struct pbias_regulator_data *data = rdev_get_drvdata(dev);
52 const struct pbias_reg_info *info = data->info;
53 int ret, vmode;
54
55 if (min_uV <= 1800000)
56 vmode = 0;
57 else if (min_uV > 1800000)
58 vmode = info->vmode;
59
60 ret = regmap_update_bits(data->syscon, data->pbias_reg,
61 info->vmode, vmode);
62
63 return ret;
64}
65
66static int pbias_regulator_get_voltage(struct regulator_dev *rdev)
67{
68 struct pbias_regulator_data *data = rdev_get_drvdata(rdev);
69 const struct pbias_reg_info *info = data->info;
70 int value, voltage;
71
72 regmap_read(data->syscon, data->pbias_reg, &value);
73 value &= info->vmode;
74
75 voltage = value ? 3000000 : 1800000;
76
77 return voltage;
78}
79
80static int pbias_regulator_enable(struct regulator_dev *rdev)
81{
82 struct pbias_regulator_data *data = rdev_get_drvdata(rdev);
83 const struct pbias_reg_info *info = data->info;
84 int ret;
85
86 ret = regmap_update_bits(data->syscon, data->pbias_reg,
87 info->enable_mask, info->enable);
88
89 return ret;
90}
91
92static int pbias_regulator_disable(struct regulator_dev *rdev)
93{
94 struct pbias_regulator_data *data = rdev_get_drvdata(rdev);
95 const struct pbias_reg_info *info = data->info;
96 int ret;
97
98 ret = regmap_update_bits(data->syscon, data->pbias_reg,
99 info->enable_mask, 0);
100 return ret;
101}
102
103static int pbias_regulator_is_enable(struct regulator_dev *rdev)
104{
105 struct pbias_regulator_data *data = rdev_get_drvdata(rdev);
106 const struct pbias_reg_info *info = data->info;
107 int value;
108
109 regmap_read(data->syscon, data->pbias_reg, &value);
110
111 return (value & info->enable_mask) == info->enable_mask;
112}
113
114static struct regulator_ops pbias_regulator_voltage_ops = {
115 .set_voltage = pbias_regulator_set_voltage,
116 .get_voltage = pbias_regulator_get_voltage,
117 .enable = pbias_regulator_enable,
118 .disable = pbias_regulator_disable,
119 .is_enabled = pbias_regulator_is_enable,
120};
121
122static const struct pbias_reg_info pbias_mmc_omap2430 = {
123 .enable = BIT(1),
124 .enable_mask = BIT(1),
125 .vmode = BIT(0),
126 .enable_time = 100,
127 .name = "pbias_mmc_omap2430"
128};
129
130static const struct pbias_reg_info pbias_sim_omap3 = {
131 .enable = BIT(9),
132 .enable_mask = BIT(9),
133 .vmode = BIT(8),
134 .enable_time = 100,
135 .name = "pbias_sim_omap3"
136};
137
138static const struct pbias_reg_info pbias_mmc_omap4 = {
139 .enable = BIT(26) | BIT(22),
140 .enable_mask = BIT(26) | BIT(25) | BIT(22),
141 .vmode = BIT(21),
142 .enable_time = 100,
143 .name = "pbias_mmc_omap4"
144};
145
146static const struct pbias_reg_info pbias_mmc_omap5 = {
147 .enable = BIT(27) | BIT(26),
148 .enable_mask = BIT(27) | BIT(25) | BIT(26),
149 .vmode = BIT(21),
150 .enable_time = 100,
151 .name = "pbias_mmc_omap5"
152};
153
154static struct of_regulator_match pbias_matches[] = {
155 { .name = "pbias_mmc_omap2430", .driver_data = (void *)&pbias_mmc_omap2430},
156 { .name = "pbias_sim_omap3", .driver_data = (void *)&pbias_sim_omap3},
157 { .name = "pbias_mmc_omap4", .driver_data = (void *)&pbias_mmc_omap4},
158 { .name = "pbias_mmc_omap5", .driver_data = (void *)&pbias_mmc_omap5},
159};
160#define PBIAS_NUM_REGS ARRAY_SIZE(pbias_matches)
161
162static const struct of_device_id pbias_of_match[] = {
163 { .compatible = "ti,pbias-omap", },
164 {},
165};
166MODULE_DEVICE_TABLE(of, pbias_of_match);
167
168static int pbias_regulator_probe(struct platform_device *pdev)
169{
170 struct device_node *np = pdev->dev.of_node;
171 struct pbias_regulator_data *drvdata;
172 struct resource *res;
173 struct regulator_config cfg = { };
174 struct regmap *syscon;
175 const struct pbias_reg_info *info;
176 int ret = 0;
177 int count, idx, data_idx = 0;
178
179 count = of_regulator_match(&pdev->dev, np, pbias_matches,
180 PBIAS_NUM_REGS);
181 if (count < 0)
182 return count;
183
184 drvdata = devm_kzalloc(&pdev->dev, sizeof(struct pbias_regulator_data)
185 * count, GFP_KERNEL);
186 if (drvdata == NULL) {
187 dev_err(&pdev->dev, "Failed to allocate device data\n");
188 return -ENOMEM;
189 }
190
191 syscon = syscon_regmap_lookup_by_phandle(np, "syscon");
192 if (IS_ERR(syscon))
193 return PTR_ERR(syscon);
194
195 cfg.dev = &pdev->dev;
196
197 for (idx = 0; idx < PBIAS_NUM_REGS && data_idx < count; idx++) {
198 if (!pbias_matches[idx].init_data ||
199 !pbias_matches[idx].of_node)
200 continue;
201
202 info = pbias_matches[idx].driver_data;
203 if (!info)
204 return -ENODEV;
205
206 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
207 if (!res)
208 return -EINVAL;
209
210 drvdata[data_idx].pbias_reg = res->start;
211 drvdata[data_idx].syscon = syscon;
212 drvdata[data_idx].info = info;
213 drvdata[data_idx].desc.name = info->name;
214 drvdata[data_idx].desc.owner = THIS_MODULE;
215 drvdata[data_idx].desc.type = REGULATOR_VOLTAGE;
216 drvdata[data_idx].desc.ops = &pbias_regulator_voltage_ops;
217 drvdata[data_idx].desc.n_voltages = 2;
218 drvdata[data_idx].desc.enable_time = info->enable_time;
219
220 cfg.init_data = pbias_matches[idx].init_data;
221 cfg.driver_data = &drvdata[data_idx];
222 cfg.of_node = pbias_matches[idx].of_node;
223
224 drvdata[data_idx].dev = devm_regulator_register(&pdev->dev,
225 &drvdata[data_idx].desc, &cfg);
226 if (IS_ERR(drvdata[data_idx].dev)) {
227 ret = PTR_ERR(drvdata[data_idx].dev);
228 dev_err(&pdev->dev,
229 "Failed to register regulator: %d\n", ret);
230 goto err_regulator;
231 }
232 data_idx++;
233 }
234
235 platform_set_drvdata(pdev, drvdata);
236
237err_regulator:
238 return ret;
239}
240
241static struct platform_driver pbias_regulator_driver = {
242 .probe = pbias_regulator_probe,
243 .driver = {
244 .name = "pbias-regulator",
245 .owner = THIS_MODULE,
246 .of_match_table = of_match_ptr(pbias_of_match),
247 },
248};
249
250module_platform_driver(pbias_regulator_driver);
251
252MODULE_AUTHOR("Balaji T K <balajitk@ti.com>");
253MODULE_DESCRIPTION("pbias voltage regulator");
254MODULE_LICENSE("GPL");
255MODULE_ALIAS("platform:pbias-regulator");