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
pbias_regulator_probe(struct platform_device * pdev)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(&pdev->dev, np, pbias_matches,
161 PBIAS_NUM_REGS);
162 if (count < 0)
163 return count;
164
165 desc = devm_kcalloc(&pdev->dev, count, sizeof(*desc), GFP_KERNEL);
166 if (!desc)
167 return -ENOMEM;
168
169 syscon = syscon_regmap_lookup_by_phandle(np, "syscon");
170 if (IS_ERR(syscon))
171 return PTR_ERR(syscon);
172
173 data = of_device_get_match_data(&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(&pdev->dev, desc, &cfg);
216 if (IS_ERR(rdev)) {
217 ret = PTR_ERR(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