1 //SPDX-License-Identifier: GPL-2.0
2 /*
3 * Copyright (C) 2017 Spreadtrum Communications Inc.
4 */
5
6 #include <linux/module.h>
7 #include <linux/of.h>
8 #include <linux/platform_device.h>
9 #include <linux/regmap.h>
10 #include <linux/regulator/driver.h>
11 #include <linux/regulator/of_regulator.h>
12
13 /*
14 * SC2731 regulator lock register
15 */
16 #define SC2731_PWR_WR_PROT 0xf0c
17 #define SC2731_WR_UNLOCK_VALUE 0x6e7f
18
19 /*
20 * SC2731 enable register
21 */
22 #define SC2731_POWER_PD_SW 0xc28
23 #define SC2731_LDO_CAMA0_PD 0xcfc
24 #define SC2731_LDO_CAMA1_PD 0xd04
25 #define SC2731_LDO_CAMMOT_PD 0xd0c
26 #define SC2731_LDO_VLDO_PD 0xd6c
27 #define SC2731_LDO_EMMCCORE_PD 0xd2c
28 #define SC2731_LDO_SDCORE_PD 0xd74
29 #define SC2731_LDO_SDIO_PD 0xd70
30 #define SC2731_LDO_WIFIPA_PD 0xd4c
31 #define SC2731_LDO_USB33_PD 0xd5c
32 #define SC2731_LDO_CAMD0_PD 0xd7c
33 #define SC2731_LDO_CAMD1_PD 0xd84
34 #define SC2731_LDO_CON_PD 0xd8c
35 #define SC2731_LDO_CAMIO_PD 0xd94
36 #define SC2731_LDO_SRAM_PD 0xd78
37
38 /*
39 * SC2731 enable mask
40 */
41 #define SC2731_DCDC_CPU0_PD_MASK BIT(4)
42 #define SC2731_DCDC_CPU1_PD_MASK BIT(3)
43 #define SC2731_DCDC_RF_PD_MASK BIT(11)
44 #define SC2731_LDO_CAMA0_PD_MASK BIT(0)
45 #define SC2731_LDO_CAMA1_PD_MASK BIT(0)
46 #define SC2731_LDO_CAMMOT_PD_MASK BIT(0)
47 #define SC2731_LDO_VLDO_PD_MASK BIT(0)
48 #define SC2731_LDO_EMMCCORE_PD_MASK BIT(0)
49 #define SC2731_LDO_SDCORE_PD_MASK BIT(0)
50 #define SC2731_LDO_SDIO_PD_MASK BIT(0)
51 #define SC2731_LDO_WIFIPA_PD_MASK BIT(0)
52 #define SC2731_LDO_USB33_PD_MASK BIT(0)
53 #define SC2731_LDO_CAMD0_PD_MASK BIT(0)
54 #define SC2731_LDO_CAMD1_PD_MASK BIT(0)
55 #define SC2731_LDO_CON_PD_MASK BIT(0)
56 #define SC2731_LDO_CAMIO_PD_MASK BIT(0)
57 #define SC2731_LDO_SRAM_PD_MASK BIT(0)
58
59 /*
60 * SC2731 vsel register
61 */
62 #define SC2731_DCDC_CPU0_VOL 0xc54
63 #define SC2731_DCDC_CPU1_VOL 0xc64
64 #define SC2731_DCDC_RF_VOL 0xcb8
65 #define SC2731_LDO_CAMA0_VOL 0xd00
66 #define SC2731_LDO_CAMA1_VOL 0xd08
67 #define SC2731_LDO_CAMMOT_VOL 0xd10
68 #define SC2731_LDO_VLDO_VOL 0xd28
69 #define SC2731_LDO_EMMCCORE_VOL 0xd30
70 #define SC2731_LDO_SDCORE_VOL 0xd38
71 #define SC2731_LDO_SDIO_VOL 0xd40
72 #define SC2731_LDO_WIFIPA_VOL 0xd50
73 #define SC2731_LDO_USB33_VOL 0xd60
74 #define SC2731_LDO_CAMD0_VOL 0xd80
75 #define SC2731_LDO_CAMD1_VOL 0xd88
76 #define SC2731_LDO_CON_VOL 0xd90
77 #define SC2731_LDO_CAMIO_VOL 0xd98
78 #define SC2731_LDO_SRAM_VOL 0xdB0
79
80 /*
81 * SC2731 vsel register mask
82 */
83 #define SC2731_DCDC_CPU0_VOL_MASK GENMASK(8, 0)
84 #define SC2731_DCDC_CPU1_VOL_MASK GENMASK(8, 0)
85 #define SC2731_DCDC_RF_VOL_MASK GENMASK(8, 0)
86 #define SC2731_LDO_CAMA0_VOL_MASK GENMASK(7, 0)
87 #define SC2731_LDO_CAMA1_VOL_MASK GENMASK(7, 0)
88 #define SC2731_LDO_CAMMOT_VOL_MASK GENMASK(7, 0)
89 #define SC2731_LDO_VLDO_VOL_MASK GENMASK(7, 0)
90 #define SC2731_LDO_EMMCCORE_VOL_MASK GENMASK(7, 0)
91 #define SC2731_LDO_SDCORE_VOL_MASK GENMASK(7, 0)
92 #define SC2731_LDO_SDIO_VOL_MASK GENMASK(7, 0)
93 #define SC2731_LDO_WIFIPA_VOL_MASK GENMASK(7, 0)
94 #define SC2731_LDO_USB33_VOL_MASK GENMASK(7, 0)
95 #define SC2731_LDO_CAMD0_VOL_MASK GENMASK(6, 0)
96 #define SC2731_LDO_CAMD1_VOL_MASK GENMASK(6, 0)
97 #define SC2731_LDO_CON_VOL_MASK GENMASK(6, 0)
98 #define SC2731_LDO_CAMIO_VOL_MASK GENMASK(6, 0)
99 #define SC2731_LDO_SRAM_VOL_MASK GENMASK(6, 0)
100
101 enum sc2731_regulator_id {
102 SC2731_BUCK_CPU0,
103 SC2731_BUCK_CPU1,
104 SC2731_BUCK_RF,
105 SC2731_LDO_CAMA0,
106 SC2731_LDO_CAMA1,
107 SC2731_LDO_CAMMOT,
108 SC2731_LDO_VLDO,
109 SC2731_LDO_EMMCCORE,
110 SC2731_LDO_SDCORE,
111 SC2731_LDO_SDIO,
112 SC2731_LDO_WIFIPA,
113 SC2731_LDO_USB33,
114 SC2731_LDO_CAMD0,
115 SC2731_LDO_CAMD1,
116 SC2731_LDO_CON,
117 SC2731_LDO_CAMIO,
118 SC2731_LDO_SRAM,
119 };
120
121 static const struct regulator_ops sc2731_regu_linear_ops = {
122 .enable = regulator_enable_regmap,
123 .disable = regulator_disable_regmap,
124 .is_enabled = regulator_is_enabled_regmap,
125 .list_voltage = regulator_list_voltage_linear,
126 .get_voltage_sel = regulator_get_voltage_sel_regmap,
127 .set_voltage_sel = regulator_set_voltage_sel_regmap,
128 };
129
130 #define SC2731_REGU_LINEAR(_id, en_reg, en_mask, vreg, vmask, \
131 vstep, vmin, vmax) { \
132 .name = #_id, \
133 .of_match = of_match_ptr(#_id), \
134 .ops = &sc2731_regu_linear_ops, \
135 .type = REGULATOR_VOLTAGE, \
136 .id = SC2731_##_id, \
137 .owner = THIS_MODULE, \
138 .min_uV = vmin, \
139 .n_voltages = ((vmax) - (vmin)) / (vstep) + 1, \
140 .uV_step = vstep, \
141 .enable_is_inverted = true, \
142 .enable_val = 0, \
143 .enable_reg = en_reg, \
144 .enable_mask = en_mask, \
145 .vsel_reg = vreg, \
146 .vsel_mask = vmask, \
147 }
148
149 static const struct regulator_desc regulators[] = {
150 SC2731_REGU_LINEAR(BUCK_CPU0, SC2731_POWER_PD_SW,
151 SC2731_DCDC_CPU0_PD_MASK, SC2731_DCDC_CPU0_VOL,
152 SC2731_DCDC_CPU0_VOL_MASK, 3125, 400000, 1996875),
153 SC2731_REGU_LINEAR(BUCK_CPU1, SC2731_POWER_PD_SW,
154 SC2731_DCDC_CPU1_PD_MASK, SC2731_DCDC_CPU1_VOL,
155 SC2731_DCDC_CPU1_VOL_MASK, 3125, 400000, 1996875),
156 SC2731_REGU_LINEAR(BUCK_RF, SC2731_POWER_PD_SW, SC2731_DCDC_RF_PD_MASK,
157 SC2731_DCDC_RF_VOL, SC2731_DCDC_RF_VOL_MASK,
158 3125, 600000, 2196875),
159 SC2731_REGU_LINEAR(LDO_CAMA0, SC2731_LDO_CAMA0_PD,
160 SC2731_LDO_CAMA0_PD_MASK, SC2731_LDO_CAMA0_VOL,
161 SC2731_LDO_CAMA0_VOL_MASK, 10000, 1200000, 3750000),
162 SC2731_REGU_LINEAR(LDO_CAMA1, SC2731_LDO_CAMA1_PD,
163 SC2731_LDO_CAMA1_PD_MASK, SC2731_LDO_CAMA1_VOL,
164 SC2731_LDO_CAMA1_VOL_MASK, 10000, 1200000, 3750000),
165 SC2731_REGU_LINEAR(LDO_CAMMOT, SC2731_LDO_CAMMOT_PD,
166 SC2731_LDO_CAMMOT_PD_MASK, SC2731_LDO_CAMMOT_VOL,
167 SC2731_LDO_CAMMOT_VOL_MASK, 10000, 1200000, 3750000),
168 SC2731_REGU_LINEAR(LDO_VLDO, SC2731_LDO_VLDO_PD,
169 SC2731_LDO_VLDO_PD_MASK, SC2731_LDO_VLDO_VOL,
170 SC2731_LDO_VLDO_VOL_MASK, 10000, 1200000, 3750000),
171 SC2731_REGU_LINEAR(LDO_EMMCCORE, SC2731_LDO_EMMCCORE_PD,
172 SC2731_LDO_EMMCCORE_PD_MASK, SC2731_LDO_EMMCCORE_VOL,
173 SC2731_LDO_EMMCCORE_VOL_MASK, 10000, 1200000,
174 3750000),
175 SC2731_REGU_LINEAR(LDO_SDCORE, SC2731_LDO_SDCORE_PD,
176 SC2731_LDO_SDCORE_PD_MASK, SC2731_LDO_SDCORE_VOL,
177 SC2731_LDO_SDCORE_VOL_MASK, 10000, 1200000, 3750000),
178 SC2731_REGU_LINEAR(LDO_SDIO, SC2731_LDO_SDIO_PD,
179 SC2731_LDO_SDIO_PD_MASK, SC2731_LDO_SDIO_VOL,
180 SC2731_LDO_SDIO_VOL_MASK, 10000, 1200000, 3750000),
181 SC2731_REGU_LINEAR(LDO_WIFIPA, SC2731_LDO_WIFIPA_PD,
182 SC2731_LDO_WIFIPA_PD_MASK, SC2731_LDO_WIFIPA_VOL,
183 SC2731_LDO_WIFIPA_VOL_MASK, 10000, 1200000, 3750000),
184 SC2731_REGU_LINEAR(LDO_USB33, SC2731_LDO_USB33_PD,
185 SC2731_LDO_USB33_PD_MASK, SC2731_LDO_USB33_VOL,
186 SC2731_LDO_USB33_VOL_MASK, 10000, 1200000, 3750000),
187 SC2731_REGU_LINEAR(LDO_CAMD0, SC2731_LDO_CAMD0_PD,
188 SC2731_LDO_CAMD0_PD_MASK, SC2731_LDO_CAMD0_VOL,
189 SC2731_LDO_CAMD0_VOL_MASK, 6250, 1000000, 1793750),
190 SC2731_REGU_LINEAR(LDO_CAMD1, SC2731_LDO_CAMD1_PD,
191 SC2731_LDO_CAMD1_PD_MASK, SC2731_LDO_CAMD1_VOL,
192 SC2731_LDO_CAMD1_VOL_MASK, 6250, 1000000, 1793750),
193 SC2731_REGU_LINEAR(LDO_CON, SC2731_LDO_CON_PD,
194 SC2731_LDO_CON_PD_MASK, SC2731_LDO_CON_VOL,
195 SC2731_LDO_CON_VOL_MASK, 6250, 1000000, 1793750),
196 SC2731_REGU_LINEAR(LDO_CAMIO, SC2731_LDO_CAMIO_PD,
197 SC2731_LDO_CAMIO_PD_MASK, SC2731_LDO_CAMIO_VOL,
198 SC2731_LDO_CAMIO_VOL_MASK, 6250, 1000000, 1793750),
199 SC2731_REGU_LINEAR(LDO_SRAM, SC2731_LDO_SRAM_PD,
200 SC2731_LDO_SRAM_PD_MASK, SC2731_LDO_SRAM_VOL,
201 SC2731_LDO_SRAM_VOL_MASK, 6250, 1000000, 1793750),
202 };
203
sc2731_regulator_unlock(struct regmap * regmap)204 static int sc2731_regulator_unlock(struct regmap *regmap)
205 {
206 return regmap_write(regmap, SC2731_PWR_WR_PROT,
207 SC2731_WR_UNLOCK_VALUE);
208 }
209
sc2731_regulator_probe(struct platform_device * pdev)210 static int sc2731_regulator_probe(struct platform_device *pdev)
211 {
212 int i, ret;
213 struct regmap *regmap;
214 struct regulator_config config = { };
215 struct regulator_dev *rdev;
216
217 regmap = dev_get_regmap(pdev->dev.parent, NULL);
218 if (!regmap) {
219 dev_err(&pdev->dev, "failed to get regmap.\n");
220 return -ENODEV;
221 }
222
223 ret = sc2731_regulator_unlock(regmap);
224 if (ret) {
225 dev_err(&pdev->dev, "failed to release regulator lock\n");
226 return ret;
227 }
228
229 config.dev = &pdev->dev;
230 config.regmap = regmap;
231
232 for (i = 0; i < ARRAY_SIZE(regulators); i++) {
233 rdev = devm_regulator_register(&pdev->dev, ®ulators[i],
234 &config);
235 if (IS_ERR(rdev)) {
236 dev_err(&pdev->dev, "failed to register regulator %s\n",
237 regulators[i].name);
238 return PTR_ERR(rdev);
239 }
240 }
241
242 return 0;
243 }
244
245 static struct platform_driver sc2731_regulator_driver = {
246 .driver = {
247 .name = "sc27xx-regulator",
248 },
249 .probe = sc2731_regulator_probe,
250 };
251
252 module_platform_driver(sc2731_regulator_driver);
253
254 MODULE_AUTHOR("Chen Junhui <erick.chen@spreadtrum.com>");
255 MODULE_DESCRIPTION("Spreadtrum SC2731 regulator driver");
256 MODULE_LICENSE("GPL v2");
257