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;
33 u32 disable_val;
34 u32 vmode;
35 unsigned int enable_time;
36 char *name;
37 const unsigned int *pbias_volt_table;
38 int n_voltages;
39 };
40
41 struct pbias_regulator_data {
42 struct regulator_desc desc;
43 void __iomem *pbias_addr;
44 struct regulator_dev *dev;
45 struct regmap *syscon;
46 const struct pbias_reg_info *info;
47 int voltage;
48 };
49
50 struct pbias_of_data {
51 unsigned int offset;
52 };
53
54 static const unsigned int pbias_volt_table_3_0V[] = {
55 1800000,
56 3000000
57 };
58
59 static const unsigned int pbias_volt_table_3_3V[] = {
60 1800000,
61 3300000
62 };
63
64 static const struct regulator_ops pbias_regulator_voltage_ops = {
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,
68 .enable = regulator_enable_regmap,
69 .disable = regulator_disable_regmap,
70 .is_enabled = regulator_is_enabled_regmap,
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),
77 .disable_val = 0,
78 .enable_time = 100,
79 .pbias_volt_table = pbias_volt_table_3_0V,
80 .n_voltages = 2,
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,
89 .pbias_volt_table = pbias_volt_table_3_0V,
90 .n_voltages = 2,
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),
97 .disable_val = BIT(25),
98 .vmode = BIT(21),
99 .enable_time = 100,
100 .pbias_volt_table = pbias_volt_table_3_0V,
101 .n_voltages = 2,
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),
108 .disable_val = BIT(25),
109 .vmode = BIT(21),
110 .enable_time = 100,
111 .pbias_volt_table = pbias_volt_table_3_3V,
112 .n_voltages = 2,
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
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
146 static const struct of_device_id pbias_of_match[] = {
147 { .compatible = "ti,pbias-omap", },
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, },
153 {},
154 };
155 MODULE_DEVICE_TABLE(of, pbias_of_match);
156
pbias_regulator_probe(struct platform_device * pdev)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;
167 const struct of_device_id *match;
168 const struct pbias_of_data *data;
169 unsigned int offset;
170
171 count = of_regulator_match(&pdev->dev, np, pbias_matches,
172 PBIAS_NUM_REGS);
173 if (count < 0)
174 return count;
175
176 drvdata = devm_kcalloc(&pdev->dev,
177 count, sizeof(struct pbias_regulator_data),
178 GFP_KERNEL);
179 if (!drvdata)
180 return -ENOMEM;
181
182 syscon = syscon_regmap_lookup_by_phandle(np, "syscon");
183 if (IS_ERR(syscon))
184 return PTR_ERR(syscon);
185
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
200 cfg.regmap = syscon;
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
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;
218 drvdata[data_idx].desc.volt_table = info->pbias_volt_table;
219 drvdata[data_idx].desc.n_voltages = info->n_voltages;
220 drvdata[data_idx].desc.enable_time = info->enable_time;
221 drvdata[data_idx].desc.vsel_reg = offset;
222 drvdata[data_idx].desc.vsel_mask = info->vmode;
223 drvdata[data_idx].desc.enable_reg = offset;
224 drvdata[data_idx].desc.enable_mask = info->enable_mask;
225 drvdata[data_idx].desc.enable_val = info->enable;
226 drvdata[data_idx].desc.disable_val = info->disable_val;
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",
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");
263
