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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; | |
c329061b | 33 | u32 disable_val; |
11469e0b B |
34 | u32 vmode; |
35 | unsigned int enable_time; | |
36 | char *name; | |
27eae9d4 RK |
37 | const unsigned int *pbias_volt_table; |
38 | int n_voltages; | |
11469e0b B |
39 | }; |
40 | ||
41 | struct pbias_regulator_data { | |
42 | struct regulator_desc desc; | |
43 | void __iomem *pbias_addr; | |
11469e0b B |
44 | struct regulator_dev *dev; |
45 | struct regmap *syscon; | |
46 | const struct pbias_reg_info *info; | |
47 | int voltage; | |
48 | }; | |
49 | ||
b9c93646 KVA |
50 | struct pbias_of_data { |
51 | unsigned int offset; | |
52 | }; | |
53 | ||
27eae9d4 | 54 | static const unsigned int pbias_volt_table_3_0V[] = { |
60e8c1e3 AL |
55 | 1800000, |
56 | 3000000 | |
57 | }; | |
11469e0b | 58 | |
27eae9d4 RK |
59 | static const unsigned int pbias_volt_table_3_3V[] = { |
60 | 1800000, | |
61 | 3300000 | |
62 | }; | |
63 | ||
a180df71 | 64 | static const struct regulator_ops pbias_regulator_voltage_ops = { |
60e8c1e3 AL |
65 | .list_voltage = regulator_list_voltage_table, |
66 | .get_voltage_sel = regulator_get_voltage_sel_regmap, | |
67 | .set_voltage_sel = regulator_set_voltage_sel_regmap, | |
75dbf0a0 | 68 | .enable = regulator_enable_regmap, |
60e8c1e3 | 69 | .disable = regulator_disable_regmap, |
75dbf0a0 | 70 | .is_enabled = regulator_is_enabled_regmap, |
11469e0b B |
71 | }; |
72 | ||
73 | static const struct pbias_reg_info pbias_mmc_omap2430 = { | |
74 | .enable = BIT(1), | |
75 | .enable_mask = BIT(1), | |
76 | .vmode = BIT(0), | |
c329061b | 77 | .disable_val = 0, |
11469e0b | 78 | .enable_time = 100, |
27eae9d4 RK |
79 | .pbias_volt_table = pbias_volt_table_3_0V, |
80 | .n_voltages = 2, | |
11469e0b B |
81 | .name = "pbias_mmc_omap2430" |
82 | }; | |
83 | ||
84 | static const struct pbias_reg_info pbias_sim_omap3 = { | |
85 | .enable = BIT(9), | |
86 | .enable_mask = BIT(9), | |
87 | .vmode = BIT(8), | |
88 | .enable_time = 100, | |
27eae9d4 RK |
89 | .pbias_volt_table = pbias_volt_table_3_0V, |
90 | .n_voltages = 2, | |
11469e0b B |
91 | .name = "pbias_sim_omap3" |
92 | }; | |
93 | ||
94 | static const struct pbias_reg_info pbias_mmc_omap4 = { | |
95 | .enable = BIT(26) | BIT(22), | |
96 | .enable_mask = BIT(26) | BIT(25) | BIT(22), | |
c329061b | 97 | .disable_val = BIT(25), |
11469e0b B |
98 | .vmode = BIT(21), |
99 | .enable_time = 100, | |
27eae9d4 RK |
100 | .pbias_volt_table = pbias_volt_table_3_0V, |
101 | .n_voltages = 2, | |
11469e0b B |
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), | |
c329061b | 108 | .disable_val = BIT(25), |
11469e0b B |
109 | .vmode = BIT(21), |
110 | .enable_time = 100, | |
27eae9d4 RK |
111 | .pbias_volt_table = pbias_volt_table_3_3V, |
112 | .n_voltages = 2, | |
11469e0b B |
113 | .name = "pbias_mmc_omap5" |
114 | }; | |
115 | ||
116 | static struct of_regulator_match pbias_matches[] = { | |
117 | { .name = "pbias_mmc_omap2430", .driver_data = (void *)&pbias_mmc_omap2430}, | |
118 | { .name = "pbias_sim_omap3", .driver_data = (void *)&pbias_sim_omap3}, | |
119 | { .name = "pbias_mmc_omap4", .driver_data = (void *)&pbias_mmc_omap4}, | |
120 | { .name = "pbias_mmc_omap5", .driver_data = (void *)&pbias_mmc_omap5}, | |
121 | }; | |
122 | #define PBIAS_NUM_REGS ARRAY_SIZE(pbias_matches) | |
123 | ||
b9c93646 KVA |
124 | /* Offset from SCM general area (and syscon) base */ |
125 | ||
126 | static const struct pbias_of_data pbias_of_data_omap2 = { | |
127 | .offset = 0x230, | |
128 | }; | |
129 | ||
130 | static const struct pbias_of_data pbias_of_data_omap3 = { | |
131 | .offset = 0x2b0, | |
132 | }; | |
133 | ||
134 | static const struct pbias_of_data pbias_of_data_omap4 = { | |
135 | .offset = 0x60, | |
136 | }; | |
137 | ||
138 | static const struct pbias_of_data pbias_of_data_omap5 = { | |
139 | .offset = 0x60, | |
140 | }; | |
141 | ||
142 | static const struct pbias_of_data pbias_of_data_dra7 = { | |
143 | .offset = 0xe00, | |
144 | }; | |
145 | ||
11469e0b B |
146 | static const struct of_device_id pbias_of_match[] = { |
147 | { .compatible = "ti,pbias-omap", }, | |
b9c93646 KVA |
148 | { .compatible = "ti,pbias-omap2", .data = &pbias_of_data_omap2, }, |
149 | { .compatible = "ti,pbias-omap3", .data = &pbias_of_data_omap3, }, | |
150 | { .compatible = "ti,pbias-omap4", .data = &pbias_of_data_omap4, }, | |
151 | { .compatible = "ti,pbias-omap5", .data = &pbias_of_data_omap5, }, | |
152 | { .compatible = "ti,pbias-dra7", .data = &pbias_of_data_dra7, }, | |
11469e0b B |
153 | {}, |
154 | }; | |
155 | MODULE_DEVICE_TABLE(of, pbias_of_match); | |
156 | ||
157 | static int pbias_regulator_probe(struct platform_device *pdev) | |
158 | { | |
159 | struct device_node *np = pdev->dev.of_node; | |
160 | struct pbias_regulator_data *drvdata; | |
161 | struct resource *res; | |
162 | struct regulator_config cfg = { }; | |
163 | struct regmap *syscon; | |
164 | const struct pbias_reg_info *info; | |
165 | int ret = 0; | |
166 | int count, idx, data_idx = 0; | |
b9c93646 KVA |
167 | const struct of_device_id *match; |
168 | const struct pbias_of_data *data; | |
169 | unsigned int offset; | |
11469e0b B |
170 | |
171 | count = of_regulator_match(&pdev->dev, np, pbias_matches, | |
172 | PBIAS_NUM_REGS); | |
173 | if (count < 0) | |
174 | return count; | |
175 | ||
a86854d0 KC |
176 | drvdata = devm_kcalloc(&pdev->dev, |
177 | count, sizeof(struct pbias_regulator_data), | |
178 | GFP_KERNEL); | |
0ee42bb1 | 179 | if (!drvdata) |
11469e0b | 180 | return -ENOMEM; |
11469e0b B |
181 | |
182 | syscon = syscon_regmap_lookup_by_phandle(np, "syscon"); | |
183 | if (IS_ERR(syscon)) | |
184 | return PTR_ERR(syscon); | |
185 | ||
b9c93646 KVA |
186 | match = of_match_device(of_match_ptr(pbias_of_match), &pdev->dev); |
187 | if (match && match->data) { | |
188 | data = match->data; | |
189 | offset = data->offset; | |
190 | } else { | |
191 | res = platform_get_resource(pdev, IORESOURCE_MEM, 0); | |
192 | if (!res) | |
193 | return -EINVAL; | |
194 | ||
195 | offset = res->start; | |
196 | dev_WARN(&pdev->dev, | |
197 | "using legacy dt data for pbias offset\n"); | |
198 | } | |
199 | ||
60e8c1e3 | 200 | cfg.regmap = syscon; |
11469e0b B |
201 | cfg.dev = &pdev->dev; |
202 | ||
203 | for (idx = 0; idx < PBIAS_NUM_REGS && data_idx < count; idx++) { | |
204 | if (!pbias_matches[idx].init_data || | |
205 | !pbias_matches[idx].of_node) | |
206 | continue; | |
207 | ||
208 | info = pbias_matches[idx].driver_data; | |
209 | if (!info) | |
210 | return -ENODEV; | |
211 | ||
11469e0b B |
212 | drvdata[data_idx].syscon = syscon; |
213 | drvdata[data_idx].info = info; | |
214 | drvdata[data_idx].desc.name = info->name; | |
215 | drvdata[data_idx].desc.owner = THIS_MODULE; | |
216 | drvdata[data_idx].desc.type = REGULATOR_VOLTAGE; | |
217 | drvdata[data_idx].desc.ops = &pbias_regulator_voltage_ops; | |
27eae9d4 RK |
218 | drvdata[data_idx].desc.volt_table = info->pbias_volt_table; |
219 | drvdata[data_idx].desc.n_voltages = info->n_voltages; | |
11469e0b | 220 | drvdata[data_idx].desc.enable_time = info->enable_time; |
b9c93646 | 221 | drvdata[data_idx].desc.vsel_reg = offset; |
60e8c1e3 | 222 | drvdata[data_idx].desc.vsel_mask = info->vmode; |
b9c93646 | 223 | drvdata[data_idx].desc.enable_reg = offset; |
60e8c1e3 | 224 | drvdata[data_idx].desc.enable_mask = info->enable_mask; |
75dbf0a0 | 225 | drvdata[data_idx].desc.enable_val = info->enable; |
c329061b | 226 | drvdata[data_idx].desc.disable_val = info->disable_val; |
11469e0b B |
227 | |
228 | cfg.init_data = pbias_matches[idx].init_data; | |
229 | cfg.driver_data = &drvdata[data_idx]; | |
230 | cfg.of_node = pbias_matches[idx].of_node; | |
231 | ||
232 | drvdata[data_idx].dev = devm_regulator_register(&pdev->dev, | |
233 | &drvdata[data_idx].desc, &cfg); | |
234 | if (IS_ERR(drvdata[data_idx].dev)) { | |
235 | ret = PTR_ERR(drvdata[data_idx].dev); | |
236 | dev_err(&pdev->dev, | |
237 | "Failed to register regulator: %d\n", ret); | |
238 | goto err_regulator; | |
239 | } | |
240 | data_idx++; | |
241 | } | |
242 | ||
243 | platform_set_drvdata(pdev, drvdata); | |
244 | ||
245 | err_regulator: | |
246 | return ret; | |
247 | } | |
248 | ||
249 | static struct platform_driver pbias_regulator_driver = { | |
250 | .probe = pbias_regulator_probe, | |
251 | .driver = { | |
252 | .name = "pbias-regulator", | |
11469e0b B |
253 | .of_match_table = of_match_ptr(pbias_of_match), |
254 | }, | |
255 | }; | |
256 | ||
257 | module_platform_driver(pbias_regulator_driver); | |
258 | ||
259 | MODULE_AUTHOR("Balaji T K <balajitk@ti.com>"); | |
260 | MODULE_DESCRIPTION("pbias voltage regulator"); | |
261 | MODULE_LICENSE("GPL"); | |
262 | MODULE_ALIAS("platform:pbias-regulator"); |