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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 | ||
b9c93646 KVA |
41 | struct pbias_of_data { |
42 | unsigned int offset; | |
43 | }; | |
44 | ||
27eae9d4 | 45 | static const unsigned int pbias_volt_table_3_0V[] = { |
60e8c1e3 AL |
46 | 1800000, |
47 | 3000000 | |
48 | }; | |
11469e0b | 49 | |
27eae9d4 RK |
50 | static const unsigned int pbias_volt_table_3_3V[] = { |
51 | 1800000, | |
52 | 3300000 | |
53 | }; | |
54 | ||
a180df71 | 55 | static const struct regulator_ops pbias_regulator_voltage_ops = { |
60e8c1e3 AL |
56 | .list_voltage = regulator_list_voltage_table, |
57 | .get_voltage_sel = regulator_get_voltage_sel_regmap, | |
58 | .set_voltage_sel = regulator_set_voltage_sel_regmap, | |
75dbf0a0 | 59 | .enable = regulator_enable_regmap, |
60e8c1e3 | 60 | .disable = regulator_disable_regmap, |
75dbf0a0 | 61 | .is_enabled = regulator_is_enabled_regmap, |
11469e0b B |
62 | }; |
63 | ||
64 | static const struct pbias_reg_info pbias_mmc_omap2430 = { | |
65 | .enable = BIT(1), | |
66 | .enable_mask = BIT(1), | |
67 | .vmode = BIT(0), | |
c329061b | 68 | .disable_val = 0, |
11469e0b | 69 | .enable_time = 100, |
27eae9d4 RK |
70 | .pbias_volt_table = pbias_volt_table_3_0V, |
71 | .n_voltages = 2, | |
11469e0b B |
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, | |
27eae9d4 RK |
80 | .pbias_volt_table = pbias_volt_table_3_0V, |
81 | .n_voltages = 2, | |
11469e0b B |
82 | .name = "pbias_sim_omap3" |
83 | }; | |
84 | ||
85 | static const struct pbias_reg_info pbias_mmc_omap4 = { | |
86 | .enable = BIT(26) | BIT(22), | |
87 | .enable_mask = BIT(26) | BIT(25) | BIT(22), | |
c329061b | 88 | .disable_val = BIT(25), |
11469e0b B |
89 | .vmode = BIT(21), |
90 | .enable_time = 100, | |
27eae9d4 RK |
91 | .pbias_volt_table = pbias_volt_table_3_0V, |
92 | .n_voltages = 2, | |
11469e0b B |
93 | .name = "pbias_mmc_omap4" |
94 | }; | |
95 | ||
96 | static const struct pbias_reg_info pbias_mmc_omap5 = { | |
97 | .enable = BIT(27) | BIT(26), | |
98 | .enable_mask = BIT(27) | BIT(25) | BIT(26), | |
c329061b | 99 | .disable_val = BIT(25), |
11469e0b B |
100 | .vmode = BIT(21), |
101 | .enable_time = 100, | |
27eae9d4 RK |
102 | .pbias_volt_table = pbias_volt_table_3_3V, |
103 | .n_voltages = 2, | |
11469e0b B |
104 | .name = "pbias_mmc_omap5" |
105 | }; | |
106 | ||
107 | static struct of_regulator_match pbias_matches[] = { | |
108 | { .name = "pbias_mmc_omap2430", .driver_data = (void *)&pbias_mmc_omap2430}, | |
109 | { .name = "pbias_sim_omap3", .driver_data = (void *)&pbias_sim_omap3}, | |
110 | { .name = "pbias_mmc_omap4", .driver_data = (void *)&pbias_mmc_omap4}, | |
111 | { .name = "pbias_mmc_omap5", .driver_data = (void *)&pbias_mmc_omap5}, | |
112 | }; | |
113 | #define PBIAS_NUM_REGS ARRAY_SIZE(pbias_matches) | |
114 | ||
b9c93646 KVA |
115 | /* Offset from SCM general area (and syscon) base */ |
116 | ||
117 | static const struct pbias_of_data pbias_of_data_omap2 = { | |
118 | .offset = 0x230, | |
119 | }; | |
120 | ||
121 | static const struct pbias_of_data pbias_of_data_omap3 = { | |
122 | .offset = 0x2b0, | |
123 | }; | |
124 | ||
125 | static const struct pbias_of_data pbias_of_data_omap4 = { | |
126 | .offset = 0x60, | |
127 | }; | |
128 | ||
129 | static const struct pbias_of_data pbias_of_data_omap5 = { | |
130 | .offset = 0x60, | |
131 | }; | |
132 | ||
133 | static const struct pbias_of_data pbias_of_data_dra7 = { | |
134 | .offset = 0xe00, | |
135 | }; | |
136 | ||
11469e0b B |
137 | static const struct of_device_id pbias_of_match[] = { |
138 | { .compatible = "ti,pbias-omap", }, | |
b9c93646 KVA |
139 | { .compatible = "ti,pbias-omap2", .data = &pbias_of_data_omap2, }, |
140 | { .compatible = "ti,pbias-omap3", .data = &pbias_of_data_omap3, }, | |
141 | { .compatible = "ti,pbias-omap4", .data = &pbias_of_data_omap4, }, | |
142 | { .compatible = "ti,pbias-omap5", .data = &pbias_of_data_omap5, }, | |
143 | { .compatible = "ti,pbias-dra7", .data = &pbias_of_data_dra7, }, | |
11469e0b B |
144 | {}, |
145 | }; | |
146 | MODULE_DEVICE_TABLE(of, pbias_of_match); | |
147 | ||
148 | static int pbias_regulator_probe(struct platform_device *pdev) | |
149 | { | |
150 | struct device_node *np = pdev->dev.of_node; | |
11469e0b B |
151 | struct resource *res; |
152 | struct regulator_config cfg = { }; | |
df8c542e AL |
153 | struct regulator_desc *desc; |
154 | struct regulator_dev *rdev; | |
11469e0b B |
155 | struct regmap *syscon; |
156 | const struct pbias_reg_info *info; | |
df8c542e | 157 | int ret, count, idx; |
b9c93646 KVA |
158 | const struct pbias_of_data *data; |
159 | unsigned int offset; | |
11469e0b B |
160 | |
161 | count = of_regulator_match(&pdev->dev, np, pbias_matches, | |
162 | PBIAS_NUM_REGS); | |
163 | if (count < 0) | |
164 | return count; | |
165 | ||
df8c542e AL |
166 | desc = devm_kcalloc(&pdev->dev, count, sizeof(*desc), GFP_KERNEL); |
167 | if (!desc) | |
11469e0b | 168 | return -ENOMEM; |
11469e0b B |
169 | |
170 | syscon = syscon_regmap_lookup_by_phandle(np, "syscon"); | |
171 | if (IS_ERR(syscon)) | |
172 | return PTR_ERR(syscon); | |
173 | ||
41145b98 AL |
174 | data = of_device_get_match_data(&pdev->dev); |
175 | if (data) { | |
b9c93646 KVA |
176 | offset = data->offset; |
177 | } else { | |
178 | res = platform_get_resource(pdev, IORESOURCE_MEM, 0); | |
179 | if (!res) | |
180 | return -EINVAL; | |
181 | ||
182 | offset = res->start; | |
183 | dev_WARN(&pdev->dev, | |
184 | "using legacy dt data for pbias offset\n"); | |
185 | } | |
186 | ||
60e8c1e3 | 187 | cfg.regmap = syscon; |
11469e0b B |
188 | cfg.dev = &pdev->dev; |
189 | ||
df8c542e | 190 | for (idx = 0; idx < PBIAS_NUM_REGS && count; idx++) { |
11469e0b B |
191 | if (!pbias_matches[idx].init_data || |
192 | !pbias_matches[idx].of_node) | |
193 | continue; | |
194 | ||
195 | info = pbias_matches[idx].driver_data; | |
196 | if (!info) | |
197 | return -ENODEV; | |
198 | ||
df8c542e AL |
199 | desc->name = info->name; |
200 | desc->owner = THIS_MODULE; | |
201 | desc->type = REGULATOR_VOLTAGE; | |
202 | desc->ops = &pbias_regulator_voltage_ops; | |
203 | desc->volt_table = info->pbias_volt_table; | |
204 | desc->n_voltages = info->n_voltages; | |
205 | desc->enable_time = info->enable_time; | |
206 | desc->vsel_reg = offset; | |
207 | desc->vsel_mask = info->vmode; | |
208 | desc->enable_reg = offset; | |
209 | desc->enable_mask = info->enable_mask; | |
210 | desc->enable_val = info->enable; | |
211 | desc->disable_val = info->disable_val; | |
11469e0b B |
212 | |
213 | cfg.init_data = pbias_matches[idx].init_data; | |
11469e0b B |
214 | cfg.of_node = pbias_matches[idx].of_node; |
215 | ||
df8c542e AL |
216 | rdev = devm_regulator_register(&pdev->dev, desc, &cfg); |
217 | if (IS_ERR(rdev)) { | |
218 | ret = PTR_ERR(rdev); | |
11469e0b B |
219 | dev_err(&pdev->dev, |
220 | "Failed to register regulator: %d\n", ret); | |
df8c542e | 221 | return ret; |
11469e0b | 222 | } |
df8c542e AL |
223 | desc++; |
224 | count--; | |
11469e0b B |
225 | } |
226 | ||
df8c542e | 227 | return 0; |
11469e0b B |
228 | } |
229 | ||
230 | static struct platform_driver pbias_regulator_driver = { | |
231 | .probe = pbias_regulator_probe, | |
232 | .driver = { | |
233 | .name = "pbias-regulator", | |
11469e0b B |
234 | .of_match_table = of_match_ptr(pbias_of_match), |
235 | }, | |
236 | }; | |
237 | ||
238 | module_platform_driver(pbias_regulator_driver); | |
239 | ||
240 | MODULE_AUTHOR("Balaji T K <balajitk@ti.com>"); | |
241 | MODULE_DESCRIPTION("pbias voltage regulator"); | |
242 | MODULE_LICENSE("GPL"); | |
243 | MODULE_ALIAS("platform:pbias-regulator"); |