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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; | |
37 | }; | |
38 | ||
39 | struct pbias_regulator_data { | |
40 | struct regulator_desc desc; | |
41 | void __iomem *pbias_addr; | |
11469e0b B |
42 | struct regulator_dev *dev; |
43 | struct regmap *syscon; | |
44 | const struct pbias_reg_info *info; | |
45 | int voltage; | |
46 | }; | |
47 | ||
b9c93646 KVA |
48 | struct pbias_of_data { |
49 | unsigned int offset; | |
50 | }; | |
51 | ||
60e8c1e3 AL |
52 | static const unsigned int pbias_volt_table[] = { |
53 | 1800000, | |
54 | 3000000 | |
55 | }; | |
11469e0b | 56 | |
11469e0b | 57 | static struct regulator_ops pbias_regulator_voltage_ops = { |
60e8c1e3 AL |
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, | |
75dbf0a0 | 61 | .enable = regulator_enable_regmap, |
60e8c1e3 | 62 | .disable = regulator_disable_regmap, |
75dbf0a0 | 63 | .is_enabled = regulator_is_enabled_regmap, |
11469e0b B |
64 | }; |
65 | ||
66 | static const struct pbias_reg_info pbias_mmc_omap2430 = { | |
67 | .enable = BIT(1), | |
68 | .enable_mask = BIT(1), | |
69 | .vmode = BIT(0), | |
c329061b | 70 | .disable_val = 0, |
11469e0b B |
71 | .enable_time = 100, |
72 | .name = "pbias_mmc_omap2430" | |
73 | }; | |
74 | ||
75 | static const struct pbias_reg_info pbias_sim_omap3 = { | |
76 | .enable = BIT(9), | |
77 | .enable_mask = BIT(9), | |
78 | .vmode = BIT(8), | |
79 | .enable_time = 100, | |
80 | .name = "pbias_sim_omap3" | |
81 | }; | |
82 | ||
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), | |
c329061b | 86 | .disable_val = BIT(25), |
11469e0b B |
87 | .vmode = BIT(21), |
88 | .enable_time = 100, | |
89 | .name = "pbias_mmc_omap4" | |
90 | }; | |
91 | ||
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), | |
c329061b | 95 | .disable_val = BIT(25), |
11469e0b B |
96 | .vmode = BIT(21), |
97 | .enable_time = 100, | |
98 | .name = "pbias_mmc_omap5" | |
99 | }; | |
100 | ||
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}, | |
106 | }; | |
107 | #define PBIAS_NUM_REGS ARRAY_SIZE(pbias_matches) | |
108 | ||
b9c93646 KVA |
109 | /* Offset from SCM general area (and syscon) base */ |
110 | ||
111 | static const struct pbias_of_data pbias_of_data_omap2 = { | |
112 | .offset = 0x230, | |
113 | }; | |
114 | ||
115 | static const struct pbias_of_data pbias_of_data_omap3 = { | |
116 | .offset = 0x2b0, | |
117 | }; | |
118 | ||
119 | static const struct pbias_of_data pbias_of_data_omap4 = { | |
120 | .offset = 0x60, | |
121 | }; | |
122 | ||
123 | static const struct pbias_of_data pbias_of_data_omap5 = { | |
124 | .offset = 0x60, | |
125 | }; | |
126 | ||
127 | static const struct pbias_of_data pbias_of_data_dra7 = { | |
128 | .offset = 0xe00, | |
129 | }; | |
130 | ||
11469e0b B |
131 | static const struct of_device_id pbias_of_match[] = { |
132 | { .compatible = "ti,pbias-omap", }, | |
b9c93646 KVA |
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, }, | |
11469e0b B |
138 | {}, |
139 | }; | |
140 | MODULE_DEVICE_TABLE(of, pbias_of_match); | |
141 | ||
142 | static int pbias_regulator_probe(struct platform_device *pdev) | |
143 | { | |
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; | |
150 | int ret = 0; | |
151 | int count, idx, data_idx = 0; | |
b9c93646 KVA |
152 | const struct of_device_id *match; |
153 | const struct pbias_of_data *data; | |
154 | unsigned int offset; | |
11469e0b B |
155 | |
156 | count = of_regulator_match(&pdev->dev, np, pbias_matches, | |
157 | PBIAS_NUM_REGS); | |
158 | if (count < 0) | |
159 | return count; | |
160 | ||
161 | drvdata = devm_kzalloc(&pdev->dev, sizeof(struct pbias_regulator_data) | |
162 | * count, GFP_KERNEL); | |
0ee42bb1 | 163 | if (!drvdata) |
11469e0b | 164 | return -ENOMEM; |
11469e0b B |
165 | |
166 | syscon = syscon_regmap_lookup_by_phandle(np, "syscon"); | |
167 | if (IS_ERR(syscon)) | |
168 | return PTR_ERR(syscon); | |
169 | ||
b9c93646 KVA |
170 | match = of_match_device(of_match_ptr(pbias_of_match), &pdev->dev); |
171 | if (match && match->data) { | |
172 | data = match->data; | |
173 | offset = data->offset; | |
174 | } else { | |
175 | res = platform_get_resource(pdev, IORESOURCE_MEM, 0); | |
176 | if (!res) | |
177 | return -EINVAL; | |
178 | ||
179 | offset = res->start; | |
180 | dev_WARN(&pdev->dev, | |
181 | "using legacy dt data for pbias offset\n"); | |
182 | } | |
183 | ||
60e8c1e3 | 184 | cfg.regmap = syscon; |
11469e0b B |
185 | cfg.dev = &pdev->dev; |
186 | ||
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) | |
190 | continue; | |
191 | ||
192 | info = pbias_matches[idx].driver_data; | |
193 | if (!info) | |
194 | return -ENODEV; | |
195 | ||
11469e0b B |
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; | |
60e8c1e3 | 202 | drvdata[data_idx].desc.volt_table = pbias_volt_table; |
11469e0b B |
203 | drvdata[data_idx].desc.n_voltages = 2; |
204 | drvdata[data_idx].desc.enable_time = info->enable_time; | |
b9c93646 | 205 | drvdata[data_idx].desc.vsel_reg = offset; |
60e8c1e3 | 206 | drvdata[data_idx].desc.vsel_mask = info->vmode; |
b9c93646 | 207 | drvdata[data_idx].desc.enable_reg = offset; |
60e8c1e3 | 208 | drvdata[data_idx].desc.enable_mask = info->enable_mask; |
75dbf0a0 | 209 | drvdata[data_idx].desc.enable_val = info->enable; |
c329061b | 210 | drvdata[data_idx].desc.disable_val = info->disable_val; |
11469e0b B |
211 | |
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; | |
215 | ||
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); | |
220 | dev_err(&pdev->dev, | |
221 | "Failed to register regulator: %d\n", ret); | |
222 | goto err_regulator; | |
223 | } | |
224 | data_idx++; | |
225 | } | |
226 | ||
227 | platform_set_drvdata(pdev, drvdata); | |
228 | ||
229 | err_regulator: | |
230 | return ret; | |
231 | } | |
232 | ||
233 | static struct platform_driver pbias_regulator_driver = { | |
234 | .probe = pbias_regulator_probe, | |
235 | .driver = { | |
236 | .name = "pbias-regulator", | |
11469e0b B |
237 | .of_match_table = of_match_ptr(pbias_of_match), |
238 | }, | |
239 | }; | |
240 | ||
241 | module_platform_driver(pbias_regulator_driver); | |
242 | ||
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"); |