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11469e0b B |
1 | /* |
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 | ||
30 | struct pbias_reg_info { | |
31 | u32 enable; | |
32 | u32 enable_mask; | |
33 | u32 vmode; | |
34 | unsigned int enable_time; | |
35 | char *name; | |
36 | }; | |
37 | ||
38 | struct pbias_regulator_data { | |
39 | struct regulator_desc desc; | |
40 | void __iomem *pbias_addr; | |
11469e0b B |
41 | struct regulator_dev *dev; |
42 | struct regmap *syscon; | |
43 | const struct pbias_reg_info *info; | |
44 | int voltage; | |
45 | }; | |
46 | ||
60e8c1e3 AL |
47 | static const unsigned int pbias_volt_table[] = { |
48 | 1800000, | |
49 | 3000000 | |
50 | }; | |
11469e0b B |
51 | |
52 | static int pbias_regulator_enable(struct regulator_dev *rdev) | |
53 | { | |
54 | struct pbias_regulator_data *data = rdev_get_drvdata(rdev); | |
55 | const struct pbias_reg_info *info = data->info; | |
11469e0b | 56 | |
60e8c1e3 AL |
57 | return regmap_update_bits(data->syscon, rdev->desc->enable_reg, |
58 | info->enable_mask, info->enable); | |
11469e0b B |
59 | } |
60 | ||
61 | static int pbias_regulator_is_enable(struct regulator_dev *rdev) | |
62 | { | |
63 | struct pbias_regulator_data *data = rdev_get_drvdata(rdev); | |
64 | const struct pbias_reg_info *info = data->info; | |
65 | int value; | |
66 | ||
60e8c1e3 | 67 | regmap_read(data->syscon, rdev->desc->enable_reg, &value); |
11469e0b | 68 | |
1cb7b43f | 69 | return (value & info->enable_mask) == info->enable; |
11469e0b B |
70 | } |
71 | ||
72 | static struct regulator_ops pbias_regulator_voltage_ops = { | |
60e8c1e3 AL |
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, | |
11469e0b B |
79 | }; |
80 | ||
81 | static const struct pbias_reg_info pbias_mmc_omap2430 = { | |
82 | .enable = BIT(1), | |
83 | .enable_mask = BIT(1), | |
84 | .vmode = BIT(0), | |
85 | .enable_time = 100, | |
86 | .name = "pbias_mmc_omap2430" | |
87 | }; | |
88 | ||
89 | static const struct pbias_reg_info pbias_sim_omap3 = { | |
90 | .enable = BIT(9), | |
91 | .enable_mask = BIT(9), | |
92 | .vmode = BIT(8), | |
93 | .enable_time = 100, | |
94 | .name = "pbias_sim_omap3" | |
95 | }; | |
96 | ||
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), | |
100 | .vmode = BIT(21), | |
101 | .enable_time = 100, | |
102 | .name = "pbias_mmc_omap4" | |
103 | }; | |
104 | ||
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), | |
108 | .vmode = BIT(21), | |
109 | .enable_time = 100, | |
110 | .name = "pbias_mmc_omap5" | |
111 | }; | |
112 | ||
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}, | |
118 | }; | |
119 | #define PBIAS_NUM_REGS ARRAY_SIZE(pbias_matches) | |
120 | ||
121 | static const struct of_device_id pbias_of_match[] = { | |
122 | { .compatible = "ti,pbias-omap", }, | |
123 | {}, | |
124 | }; | |
125 | MODULE_DEVICE_TABLE(of, pbias_of_match); | |
126 | ||
127 | static int pbias_regulator_probe(struct platform_device *pdev) | |
128 | { | |
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; | |
135 | int ret = 0; | |
136 | int count, idx, data_idx = 0; | |
137 | ||
138 | count = of_regulator_match(&pdev->dev, np, pbias_matches, | |
139 | PBIAS_NUM_REGS); | |
140 | if (count < 0) | |
141 | return count; | |
142 | ||
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"); | |
147 | return -ENOMEM; | |
148 | } | |
149 | ||
150 | syscon = syscon_regmap_lookup_by_phandle(np, "syscon"); | |
151 | if (IS_ERR(syscon)) | |
152 | return PTR_ERR(syscon); | |
153 | ||
60e8c1e3 | 154 | cfg.regmap = syscon; |
11469e0b B |
155 | cfg.dev = &pdev->dev; |
156 | ||
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) | |
160 | continue; | |
161 | ||
162 | info = pbias_matches[idx].driver_data; | |
163 | if (!info) | |
164 | return -ENODEV; | |
165 | ||
166 | res = platform_get_resource(pdev, IORESOURCE_MEM, 0); | |
167 | if (!res) | |
168 | return -EINVAL; | |
169 | ||
11469e0b B |
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; | |
60e8c1e3 | 176 | drvdata[data_idx].desc.volt_table = pbias_volt_table; |
11469e0b B |
177 | drvdata[data_idx].desc.n_voltages = 2; |
178 | drvdata[data_idx].desc.enable_time = info->enable_time; | |
60e8c1e3 AL |
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; | |
11469e0b B |
183 | |
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; | |
187 | ||
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); | |
192 | dev_err(&pdev->dev, | |
193 | "Failed to register regulator: %d\n", ret); | |
194 | goto err_regulator; | |
195 | } | |
196 | data_idx++; | |
197 | } | |
198 | ||
199 | platform_set_drvdata(pdev, drvdata); | |
200 | ||
201 | err_regulator: | |
202 | return ret; | |
203 | } | |
204 | ||
205 | static struct platform_driver pbias_regulator_driver = { | |
206 | .probe = pbias_regulator_probe, | |
207 | .driver = { | |
208 | .name = "pbias-regulator", | |
209 | .owner = THIS_MODULE, | |
210 | .of_match_table = of_match_ptr(pbias_of_match), | |
211 | }, | |
212 | }; | |
213 | ||
214 | module_platform_driver(pbias_regulator_driver); | |
215 | ||
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"); |