1 | /* |
2 | * pbias-regulator.c |
3 | * |
4 | * Copyright (C) 2014 Texas Instruments Incorporated - https://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 | |
29 | struct pbias_reg_info { |
30 | u32 enable; |
31 | u32 enable_mask; |
32 | u32 disable_val; |
33 | u32 vmode; |
34 | unsigned int enable_time; |
35 | char *name; |
36 | const unsigned int *pbias_volt_table; |
37 | int n_voltages; |
38 | }; |
39 | |
40 | struct pbias_of_data { |
41 | unsigned int offset; |
42 | }; |
43 | |
44 | static const unsigned int pbias_volt_table_3_0V[] = { |
45 | 1800000, |
46 | 3000000 |
47 | }; |
48 | |
49 | static const unsigned int pbias_volt_table_3_3V[] = { |
50 | 1800000, |
51 | 3300000 |
52 | }; |
53 | |
54 | static const struct regulator_ops pbias_regulator_voltage_ops = { |
55 | .list_voltage = regulator_list_voltage_table, |
56 | .get_voltage_sel = regulator_get_voltage_sel_regmap, |
57 | .set_voltage_sel = regulator_set_voltage_sel_regmap, |
58 | .enable = regulator_enable_regmap, |
59 | .disable = regulator_disable_regmap, |
60 | .is_enabled = regulator_is_enabled_regmap, |
61 | }; |
62 | |
63 | static const struct pbias_reg_info pbias_mmc_omap2430 = { |
64 | .enable = BIT(1), |
65 | .enable_mask = BIT(1), |
66 | .vmode = BIT(0), |
67 | .disable_val = 0, |
68 | .enable_time = 100, |
69 | .pbias_volt_table = pbias_volt_table_3_0V, |
70 | .n_voltages = 2, |
71 | .name = "pbias_mmc_omap2430" |
72 | }; |
73 | |
74 | static const struct pbias_reg_info pbias_sim_omap3 = { |
75 | .enable = BIT(9), |
76 | .enable_mask = BIT(9), |
77 | .vmode = BIT(8), |
78 | .enable_time = 100, |
79 | .pbias_volt_table = pbias_volt_table_3_0V, |
80 | .n_voltages = 2, |
81 | .name = "pbias_sim_omap3" |
82 | }; |
83 | |
84 | static const struct pbias_reg_info pbias_mmc_omap4 = { |
85 | .enable = BIT(26) | BIT(22), |
86 | .enable_mask = BIT(26) | BIT(25) | BIT(22), |
87 | .disable_val = BIT(25), |
88 | .vmode = BIT(21), |
89 | .enable_time = 100, |
90 | .pbias_volt_table = pbias_volt_table_3_0V, |
91 | .n_voltages = 2, |
92 | .name = "pbias_mmc_omap4" |
93 | }; |
94 | |
95 | static const struct pbias_reg_info pbias_mmc_omap5 = { |
96 | .enable = BIT(27) | BIT(26), |
97 | .enable_mask = BIT(27) | BIT(25) | BIT(26), |
98 | .disable_val = BIT(25), |
99 | .vmode = BIT(21), |
100 | .enable_time = 100, |
101 | .pbias_volt_table = pbias_volt_table_3_3V, |
102 | .n_voltages = 2, |
103 | .name = "pbias_mmc_omap5" |
104 | }; |
105 | |
106 | static struct of_regulator_match pbias_matches[] = { |
107 | { .name = "pbias_mmc_omap2430" , .driver_data = (void *)&pbias_mmc_omap2430}, |
108 | { .name = "pbias_sim_omap3" , .driver_data = (void *)&pbias_sim_omap3}, |
109 | { .name = "pbias_mmc_omap4" , .driver_data = (void *)&pbias_mmc_omap4}, |
110 | { .name = "pbias_mmc_omap5" , .driver_data = (void *)&pbias_mmc_omap5}, |
111 | }; |
112 | #define PBIAS_NUM_REGS ARRAY_SIZE(pbias_matches) |
113 | |
114 | /* Offset from SCM general area (and syscon) base */ |
115 | |
116 | static const struct pbias_of_data pbias_of_data_omap2 = { |
117 | .offset = 0x230, |
118 | }; |
119 | |
120 | static const struct pbias_of_data pbias_of_data_omap3 = { |
121 | .offset = 0x2b0, |
122 | }; |
123 | |
124 | static const struct pbias_of_data pbias_of_data_omap4 = { |
125 | .offset = 0x60, |
126 | }; |
127 | |
128 | static const struct pbias_of_data pbias_of_data_omap5 = { |
129 | .offset = 0x60, |
130 | }; |
131 | |
132 | static const struct pbias_of_data pbias_of_data_dra7 = { |
133 | .offset = 0xe00, |
134 | }; |
135 | |
136 | static const struct of_device_id pbias_of_match[] = { |
137 | { .compatible = "ti,pbias-omap" , }, |
138 | { .compatible = "ti,pbias-omap2" , .data = &pbias_of_data_omap2, }, |
139 | { .compatible = "ti,pbias-omap3" , .data = &pbias_of_data_omap3, }, |
140 | { .compatible = "ti,pbias-omap4" , .data = &pbias_of_data_omap4, }, |
141 | { .compatible = "ti,pbias-omap5" , .data = &pbias_of_data_omap5, }, |
142 | { .compatible = "ti,pbias-dra7" , .data = &pbias_of_data_dra7, }, |
143 | {}, |
144 | }; |
145 | MODULE_DEVICE_TABLE(of, pbias_of_match); |
146 | |
147 | static int pbias_regulator_probe(struct platform_device *pdev) |
148 | { |
149 | struct device_node *np = pdev->dev.of_node; |
150 | struct resource *res; |
151 | struct regulator_config cfg = { }; |
152 | struct regulator_desc *desc; |
153 | struct regulator_dev *rdev; |
154 | struct regmap *syscon; |
155 | const struct pbias_reg_info *info; |
156 | int ret, count, idx; |
157 | const struct pbias_of_data *data; |
158 | unsigned int offset; |
159 | |
160 | count = of_regulator_match(dev: &pdev->dev, node: np, matches: pbias_matches, |
161 | PBIAS_NUM_REGS); |
162 | if (count < 0) |
163 | return count; |
164 | |
165 | desc = devm_kcalloc(dev: &pdev->dev, n: count, size: sizeof(*desc), GFP_KERNEL); |
166 | if (!desc) |
167 | return -ENOMEM; |
168 | |
169 | syscon = syscon_regmap_lookup_by_phandle(np, property: "syscon" ); |
170 | if (IS_ERR(ptr: syscon)) |
171 | return PTR_ERR(ptr: syscon); |
172 | |
173 | data = of_device_get_match_data(dev: &pdev->dev); |
174 | if (data) { |
175 | offset = data->offset; |
176 | } else { |
177 | res = platform_get_resource(pdev, IORESOURCE_MEM, 0); |
178 | if (!res) |
179 | return -EINVAL; |
180 | |
181 | offset = res->start; |
182 | dev_WARN(&pdev->dev, |
183 | "using legacy dt data for pbias offset\n" ); |
184 | } |
185 | |
186 | cfg.regmap = syscon; |
187 | cfg.dev = &pdev->dev; |
188 | |
189 | for (idx = 0; idx < PBIAS_NUM_REGS && count; idx++) { |
190 | if (!pbias_matches[idx].init_data || |
191 | !pbias_matches[idx].of_node) |
192 | continue; |
193 | |
194 | info = pbias_matches[idx].driver_data; |
195 | if (!info) |
196 | return -ENODEV; |
197 | |
198 | desc->name = info->name; |
199 | desc->owner = THIS_MODULE; |
200 | desc->type = REGULATOR_VOLTAGE; |
201 | desc->ops = &pbias_regulator_voltage_ops; |
202 | desc->volt_table = info->pbias_volt_table; |
203 | desc->n_voltages = info->n_voltages; |
204 | desc->enable_time = info->enable_time; |
205 | desc->vsel_reg = offset; |
206 | desc->vsel_mask = info->vmode; |
207 | desc->enable_reg = offset; |
208 | desc->enable_mask = info->enable_mask; |
209 | desc->enable_val = info->enable; |
210 | desc->disable_val = info->disable_val; |
211 | |
212 | cfg.init_data = pbias_matches[idx].init_data; |
213 | cfg.of_node = pbias_matches[idx].of_node; |
214 | |
215 | rdev = devm_regulator_register(dev: &pdev->dev, regulator_desc: desc, config: &cfg); |
216 | if (IS_ERR(ptr: rdev)) { |
217 | ret = PTR_ERR(ptr: rdev); |
218 | dev_err(&pdev->dev, |
219 | "Failed to register regulator: %d\n" , ret); |
220 | return ret; |
221 | } |
222 | desc++; |
223 | count--; |
224 | } |
225 | |
226 | return 0; |
227 | } |
228 | |
229 | static struct platform_driver pbias_regulator_driver = { |
230 | .probe = pbias_regulator_probe, |
231 | .driver = { |
232 | .name = "pbias-regulator" , |
233 | .probe_type = PROBE_PREFER_ASYNCHRONOUS, |
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" ); |
244 | |