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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
30struct 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};
38
39struct pbias_regulator_data {
40 struct regulator_desc desc;
41 void __iomem *pbias_addr;
42 struct regulator_dev *dev;
43 struct regmap *syscon;
44 const struct pbias_reg_info *info;
45 int voltage;
46};
47
48struct pbias_of_data {
49 unsigned int offset;
50};
51
52static const unsigned int pbias_volt_table[] = {
53 1800000,
54 3000000
55};
56
57static struct regulator_ops pbias_regulator_voltage_ops = {
58 .list_voltage = regulator_list_voltage_table,
59 .get_voltage_sel = regulator_get_voltage_sel_regmap,
60 .set_voltage_sel = regulator_set_voltage_sel_regmap,
61 .enable = regulator_enable_regmap,
62 .disable = regulator_disable_regmap,
63 .is_enabled = regulator_is_enabled_regmap,
64};
65
66static const struct pbias_reg_info pbias_mmc_omap2430 = {
67 .enable = BIT(1),
68 .enable_mask = BIT(1),
69 .vmode = BIT(0),
70 .disable_val = 0,
71 .enable_time = 100,
72 .name = "pbias_mmc_omap2430"
73};
74
75static 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,
80 .name = "pbias_sim_omap3"
81};
82
83static const struct pbias_reg_info pbias_mmc_omap4 = {
84 .enable = BIT(26) | BIT(22),
85 .enable_mask = BIT(26) | BIT(25) | BIT(22),
86 .disable_val = BIT(25),
87 .vmode = BIT(21),
88 .enable_time = 100,
89 .name = "pbias_mmc_omap4"
90};
91
92static const struct pbias_reg_info pbias_mmc_omap5 = {
93 .enable = BIT(27) | BIT(26),
94 .enable_mask = BIT(27) | BIT(25) | BIT(26),
95 .disable_val = BIT(25),
96 .vmode = BIT(21),
97 .enable_time = 100,
98 .name = "pbias_mmc_omap5"
99};
100
101static struct of_regulator_match pbias_matches[] = {
102 { .name = "pbias_mmc_omap2430", .driver_data = (void *)&pbias_mmc_omap2430},
103 { .name = "pbias_sim_omap3", .driver_data = (void *)&pbias_sim_omap3},
104 { .name = "pbias_mmc_omap4", .driver_data = (void *)&pbias_mmc_omap4},
105 { .name = "pbias_mmc_omap5", .driver_data = (void *)&pbias_mmc_omap5},
106};
107#define PBIAS_NUM_REGS ARRAY_SIZE(pbias_matches)
108
109
110
111static const struct pbias_of_data pbias_of_data_omap2 = {
112 .offset = 0x230,
113};
114
115static const struct pbias_of_data pbias_of_data_omap3 = {
116 .offset = 0x2b0,
117};
118
119static const struct pbias_of_data pbias_of_data_omap4 = {
120 .offset = 0x60,
121};
122
123static const struct pbias_of_data pbias_of_data_omap5 = {
124 .offset = 0x60,
125};
126
127static const struct pbias_of_data pbias_of_data_dra7 = {
128 .offset = 0xe00,
129};
130
131static const struct of_device_id pbias_of_match[] = {
132 { .compatible = "ti,pbias-omap", },
133 { .compatible = "ti,pbias-omap2", .data = &pbias_of_data_omap2, },
134 { .compatible = "ti,pbias-omap3", .data = &pbias_of_data_omap3, },
135 { .compatible = "ti,pbias-omap4", .data = &pbias_of_data_omap4, },
136 { .compatible = "ti,pbias-omap5", .data = &pbias_of_data_omap5, },
137 { .compatible = "ti,pbias-dra7", .data = &pbias_of_data_dra7, },
138 {},
139};
140MODULE_DEVICE_TABLE(of, pbias_of_match);
141
142static int pbias_regulator_probe(struct platform_device *pdev)
143{
144 struct device_node *np = pdev->dev.of_node;
145 struct pbias_regulator_data *drvdata;
146 struct resource *res;
147 struct regulator_config cfg = { };
148 struct regmap *syscon;
149 const struct pbias_reg_info *info;
150 int ret = 0;
151 int count, idx, data_idx = 0;
152 const struct of_device_id *match;
153 const struct pbias_of_data *data;
154 unsigned int offset;
155
156 count = of_regulator_match(&pdev->dev, np, pbias_matches,
157 PBIAS_NUM_REGS);
158 if (count < 0)
159 return count;
160
161 drvdata = devm_kzalloc(&pdev->dev, sizeof(struct pbias_regulator_data)
162 * count, GFP_KERNEL);
163 if (!drvdata)
164 return -ENOMEM;
165
166 syscon = syscon_regmap_lookup_by_phandle(np, "syscon");
167 if (IS_ERR(syscon))
168 return PTR_ERR(syscon);
169
170 match = of_match_device(of_match_ptr(pbias_of_match), &pdev->dev);
171 if (match && match->data) {
172 data = match->data;
173 offset = data->offset;
174 } else {
175 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
176 if (!res)
177 return -EINVAL;
178
179 offset = res->start;
180 dev_WARN(&pdev->dev,
181 "using legacy dt data for pbias offset\n");
182 }
183
184 cfg.regmap = syscon;
185 cfg.dev = &pdev->dev;
186
187 for (idx = 0; idx < PBIAS_NUM_REGS && data_idx < count; idx++) {
188 if (!pbias_matches[idx].init_data ||
189 !pbias_matches[idx].of_node)
190 continue;
191
192 info = pbias_matches[idx].driver_data;
193 if (!info)
194 return -ENODEV;
195
196 drvdata[data_idx].syscon = syscon;
197 drvdata[data_idx].info = info;
198 drvdata[data_idx].desc.name = info->name;
199 drvdata[data_idx].desc.owner = THIS_MODULE;
200 drvdata[data_idx].desc.type = REGULATOR_VOLTAGE;
201 drvdata[data_idx].desc.ops = &pbias_regulator_voltage_ops;
202 drvdata[data_idx].desc.volt_table = pbias_volt_table;
203 drvdata[data_idx].desc.n_voltages = 2;
204 drvdata[data_idx].desc.enable_time = info->enable_time;
205 drvdata[data_idx].desc.vsel_reg = offset;
206 drvdata[data_idx].desc.vsel_mask = info->vmode;
207 drvdata[data_idx].desc.enable_reg = offset;
208 drvdata[data_idx].desc.enable_mask = info->enable_mask;
209 drvdata[data_idx].desc.enable_val = info->enable;
210 drvdata[data_idx].desc.disable_val = info->disable_val;
211
212 cfg.init_data = pbias_matches[idx].init_data;
213 cfg.driver_data = &drvdata[data_idx];
214 cfg.of_node = pbias_matches[idx].of_node;
215
216 drvdata[data_idx].dev = devm_regulator_register(&pdev->dev,
217 &drvdata[data_idx].desc, &cfg);
218 if (IS_ERR(drvdata[data_idx].dev)) {
219 ret = PTR_ERR(drvdata[data_idx].dev);
220 dev_err(&pdev->dev,
221 "Failed to register regulator: %d\n", ret);
222 goto err_regulator;
223 }
224 data_idx++;
225 }
226
227 platform_set_drvdata(pdev, drvdata);
228
229err_regulator:
230 return ret;
231}
232
233static struct platform_driver pbias_regulator_driver = {
234 .probe = pbias_regulator_probe,
235 .driver = {
236 .name = "pbias-regulator",
237 .of_match_table = of_match_ptr(pbias_of_match),
238 },
239};
240
241module_platform_driver(pbias_regulator_driver);
242
243MODULE_AUTHOR("Balaji T K <balajitk@ti.com>");
244MODULE_DESCRIPTION("pbias voltage regulator");
245MODULE_LICENSE("GPL");
246MODULE_ALIAS("platform:pbias-regulator");
247
