Merge branch 'for-4.19' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/wq
[linux-2.6-microblaze.git] / drivers / regulator / pbias-regulator.c
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
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");