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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 const unsigned int *pbias_volt_table;
38 int n_voltages;
39};
40
41struct pbias_of_data {
42 unsigned int offset;
43};
44
45static const unsigned int pbias_volt_table_3_0V[] = {
46 1800000,
47 3000000
48};
49
50static const unsigned int pbias_volt_table_3_3V[] = {
51 1800000,
52 3300000
53};
54
55static const struct regulator_ops pbias_regulator_voltage_ops = {
56 .list_voltage = regulator_list_voltage_table,
57 .get_voltage_sel = regulator_get_voltage_sel_regmap,
58 .set_voltage_sel = regulator_set_voltage_sel_regmap,
59 .enable = regulator_enable_regmap,
60 .disable = regulator_disable_regmap,
61 .is_enabled = regulator_is_enabled_regmap,
62};
63
64static const struct pbias_reg_info pbias_mmc_omap2430 = {
65 .enable = BIT(1),
66 .enable_mask = BIT(1),
67 .vmode = BIT(0),
68 .disable_val = 0,
69 .enable_time = 100,
70 .pbias_volt_table = pbias_volt_table_3_0V,
71 .n_voltages = 2,
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 .pbias_volt_table = pbias_volt_table_3_0V,
81 .n_voltages = 2,
82 .name = "pbias_sim_omap3"
83};
84
85static const struct pbias_reg_info pbias_mmc_omap4 = {
86 .enable = BIT(26) | BIT(22),
87 .enable_mask = BIT(26) | BIT(25) | BIT(22),
88 .disable_val = BIT(25),
89 .vmode = BIT(21),
90 .enable_time = 100,
91 .pbias_volt_table = pbias_volt_table_3_0V,
92 .n_voltages = 2,
93 .name = "pbias_mmc_omap4"
94};
95
96static const struct pbias_reg_info pbias_mmc_omap5 = {
97 .enable = BIT(27) | BIT(26),
98 .enable_mask = BIT(27) | BIT(25) | BIT(26),
99 .disable_val = BIT(25),
100 .vmode = BIT(21),
101 .enable_time = 100,
102 .pbias_volt_table = pbias_volt_table_3_3V,
103 .n_voltages = 2,
104 .name = "pbias_mmc_omap5"
105};
106
107static struct of_regulator_match pbias_matches[] = {
108 { .name = "pbias_mmc_omap2430", .driver_data = (void *)&pbias_mmc_omap2430},
109 { .name = "pbias_sim_omap3", .driver_data = (void *)&pbias_sim_omap3},
110 { .name = "pbias_mmc_omap4", .driver_data = (void *)&pbias_mmc_omap4},
111 { .name = "pbias_mmc_omap5", .driver_data = (void *)&pbias_mmc_omap5},
112};
113#define PBIAS_NUM_REGS ARRAY_SIZE(pbias_matches)
114
115
116
117static const struct pbias_of_data pbias_of_data_omap2 = {
118 .offset = 0x230,
119};
120
121static const struct pbias_of_data pbias_of_data_omap3 = {
122 .offset = 0x2b0,
123};
124
125static const struct pbias_of_data pbias_of_data_omap4 = {
126 .offset = 0x60,
127};
128
129static const struct pbias_of_data pbias_of_data_omap5 = {
130 .offset = 0x60,
131};
132
133static const struct pbias_of_data pbias_of_data_dra7 = {
134 .offset = 0xe00,
135};
136
137static const struct of_device_id pbias_of_match[] = {
138 { .compatible = "ti,pbias-omap", },
139 { .compatible = "ti,pbias-omap2", .data = &pbias_of_data_omap2, },
140 { .compatible = "ti,pbias-omap3", .data = &pbias_of_data_omap3, },
141 { .compatible = "ti,pbias-omap4", .data = &pbias_of_data_omap4, },
142 { .compatible = "ti,pbias-omap5", .data = &pbias_of_data_omap5, },
143 { .compatible = "ti,pbias-dra7", .data = &pbias_of_data_dra7, },
144 {},
145};
146MODULE_DEVICE_TABLE(of, pbias_of_match);
147
148static int pbias_regulator_probe(struct platform_device *pdev)
149{
150 struct device_node *np = pdev->dev.of_node;
151 struct resource *res;
152 struct regulator_config cfg = { };
153 struct regulator_desc *desc;
154 struct regulator_dev *rdev;
155 struct regmap *syscon;
156 const struct pbias_reg_info *info;
157 int ret, count, idx;
158 const struct pbias_of_data *data;
159 unsigned int offset;
160
161 count = of_regulator_match(&pdev->dev, np, pbias_matches,
162 PBIAS_NUM_REGS);
163 if (count < 0)
164 return count;
165
166 desc = devm_kcalloc(&pdev->dev, count, sizeof(*desc), GFP_KERNEL);
167 if (!desc)
168 return -ENOMEM;
169
170 syscon = syscon_regmap_lookup_by_phandle(np, "syscon");
171 if (IS_ERR(syscon))
172 return PTR_ERR(syscon);
173
174 data = of_device_get_match_data(&pdev->dev);
175 if (data) {
176 offset = data->offset;
177 } else {
178 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
179 if (!res)
180 return -EINVAL;
181
182 offset = res->start;
183 dev_WARN(&pdev->dev,
184 "using legacy dt data for pbias offset\n");
185 }
186
187 cfg.regmap = syscon;
188 cfg.dev = &pdev->dev;
189
190 for (idx = 0; idx < PBIAS_NUM_REGS && count; idx++) {
191 if (!pbias_matches[idx].init_data ||
192 !pbias_matches[idx].of_node)
193 continue;
194
195 info = pbias_matches[idx].driver_data;
196 if (!info)
197 return -ENODEV;
198
199 desc->name = info->name;
200 desc->owner = THIS_MODULE;
201 desc->type = REGULATOR_VOLTAGE;
202 desc->ops = &pbias_regulator_voltage_ops;
203 desc->volt_table = info->pbias_volt_table;
204 desc->n_voltages = info->n_voltages;
205 desc->enable_time = info->enable_time;
206 desc->vsel_reg = offset;
207 desc->vsel_mask = info->vmode;
208 desc->enable_reg = offset;
209 desc->enable_mask = info->enable_mask;
210 desc->enable_val = info->enable;
211 desc->disable_val = info->disable_val;
212
213 cfg.init_data = pbias_matches[idx].init_data;
214 cfg.of_node = pbias_matches[idx].of_node;
215
216 rdev = devm_regulator_register(&pdev->dev, desc, &cfg);
217 if (IS_ERR(rdev)) {
218 ret = PTR_ERR(rdev);
219 dev_err(&pdev->dev,
220 "Failed to register regulator: %d\n", ret);
221 return ret;
222 }
223 desc++;
224 count--;
225 }
226
227 return 0;
228}
229
230static struct platform_driver pbias_regulator_driver = {
231 .probe = pbias_regulator_probe,
232 .driver = {
233 .name = "pbias-regulator",
234 .of_match_table = of_match_ptr(pbias_of_match),
235 },
236};
237
238module_platform_driver(pbias_regulator_driver);
239
240MODULE_AUTHOR("Balaji T K <balajitk@ti.com>");
241MODULE_DESCRIPTION("pbias voltage regulator");
242MODULE_LICENSE("GPL");
243MODULE_ALIAS("platform:pbias-regulator");
244
