1 /*
2 * Device driver for regulators in Hi655x IC
3 *
4 * Copyright (c) 2016 Hisilicon.
5 *
6 * Authors:
7 * Chen Feng <puck.chen@hisilicon.com>
8 * Fei Wang <w.f@huawei.com>
9 *
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License version 2 as
12 * published by the Free Software Foundation.
13 */
14
15 #include <linux/bitops.h>
16 #include <linux/device.h>
17 #include <linux/err.h>
18 #include <linux/module.h>
19 #include <linux/io.h>
20 #include <linux/of.h>
21 #include <linux/platform_device.h>
22 #include <linux/regmap.h>
23 #include <linux/regulator/driver.h>
24 #include <linux/regulator/machine.h>
25 #include <linux/regulator/of_regulator.h>
26 #include <linux/mfd/hi655x-pmic.h>
27
28 struct hi655x_regulator {
29 unsigned int disable_reg;
30 unsigned int status_reg;
31 unsigned int ctrl_regs;
32 unsigned int ctrl_mask;
33 struct regulator_desc rdesc;
34 };
35
36 /* LDO7 & LDO10 */
37 static const unsigned int ldo7_voltages[] = {
38 1800000, 1850000, 2850000, 2900000,
39 3000000, 3100000, 3200000, 3300000,
40 };
41
42 static const unsigned int ldo19_voltages[] = {
43 1800000, 1850000, 1900000, 1750000,
44 2800000, 2850000, 2900000, 3000000,
45 };
46
47 static const unsigned int ldo22_voltages[] = {
48 900000, 1000000, 1050000, 1100000,
49 1150000, 1175000, 1185000, 1200000,
50 };
51
52 enum hi655x_regulator_id {
53 HI655X_LDO0,
54 HI655X_LDO1,
55 HI655X_LDO2,
56 HI655X_LDO3,
57 HI655X_LDO4,
58 HI655X_LDO5,
59 HI655X_LDO6,
60 HI655X_LDO7,
61 HI655X_LDO8,
62 HI655X_LDO9,
63 HI655X_LDO10,
64 HI655X_LDO11,
65 HI655X_LDO12,
66 HI655X_LDO13,
67 HI655X_LDO14,
68 HI655X_LDO15,
69 HI655X_LDO16,
70 HI655X_LDO17,
71 HI655X_LDO18,
72 HI655X_LDO19,
73 HI655X_LDO20,
74 HI655X_LDO21,
75 HI655X_LDO22,
76 };
77
hi655x_is_enabled(struct regulator_dev * rdev)78 static int hi655x_is_enabled(struct regulator_dev *rdev)
79 {
80 unsigned int value = 0;
81
82 struct hi655x_regulator *regulator = rdev_get_drvdata(rdev);
83
84 regmap_read(rdev->regmap, regulator->status_reg, &value);
85 return (value & BIT(regulator->ctrl_mask));
86 }
87
hi655x_disable(struct regulator_dev * rdev)88 static int hi655x_disable(struct regulator_dev *rdev)
89 {
90 int ret = 0;
91
92 struct hi655x_regulator *regulator = rdev_get_drvdata(rdev);
93
94 ret = regmap_write(rdev->regmap, regulator->disable_reg,
95 BIT(regulator->ctrl_mask));
96 return ret;
97 }
98
99 static const struct regulator_ops hi655x_regulator_ops = {
100 .enable = regulator_enable_regmap,
101 .disable = hi655x_disable,
102 .is_enabled = hi655x_is_enabled,
103 .list_voltage = regulator_list_voltage_table,
104 .get_voltage_sel = regulator_get_voltage_sel_regmap,
105 .set_voltage_sel = regulator_set_voltage_sel_regmap,
106 };
107
108 static const struct regulator_ops hi655x_ldo_linear_ops = {
109 .enable = regulator_enable_regmap,
110 .disable = hi655x_disable,
111 .is_enabled = hi655x_is_enabled,
112 .list_voltage = regulator_list_voltage_linear,
113 .get_voltage_sel = regulator_get_voltage_sel_regmap,
114 .set_voltage_sel = regulator_set_voltage_sel_regmap,
115 };
116
117 #define HI655X_LDO(_ID, vreg, vmask, ereg, dreg, \
118 sreg, cmask, vtable) { \
119 .rdesc = { \
120 .name = #_ID, \
121 .of_match = of_match_ptr(#_ID), \
122 .ops = &hi655x_regulator_ops, \
123 .regulators_node = of_match_ptr("regulators"), \
124 .type = REGULATOR_VOLTAGE, \
125 .id = HI655X_##_ID, \
126 .owner = THIS_MODULE, \
127 .n_voltages = ARRAY_SIZE(vtable), \
128 .volt_table = vtable, \
129 .vsel_reg = HI655X_BUS_ADDR(vreg), \
130 .vsel_mask = vmask, \
131 .enable_reg = HI655X_BUS_ADDR(ereg), \
132 .enable_mask = BIT(cmask), \
133 }, \
134 .disable_reg = HI655X_BUS_ADDR(dreg), \
135 .status_reg = HI655X_BUS_ADDR(sreg), \
136 .ctrl_mask = cmask, \
137 }
138
139 #define HI655X_LDO_LINEAR(_ID, vreg, vmask, ereg, dreg, \
140 sreg, cmask, minv, nvolt, vstep) { \
141 .rdesc = { \
142 .name = #_ID, \
143 .of_match = of_match_ptr(#_ID), \
144 .ops = &hi655x_ldo_linear_ops, \
145 .regulators_node = of_match_ptr("regulators"), \
146 .type = REGULATOR_VOLTAGE, \
147 .id = HI655X_##_ID, \
148 .owner = THIS_MODULE, \
149 .min_uV = minv, \
150 .n_voltages = nvolt, \
151 .uV_step = vstep, \
152 .vsel_reg = HI655X_BUS_ADDR(vreg), \
153 .vsel_mask = vmask, \
154 .enable_reg = HI655X_BUS_ADDR(ereg), \
155 .enable_mask = BIT(cmask), \
156 }, \
157 .disable_reg = HI655X_BUS_ADDR(dreg), \
158 .status_reg = HI655X_BUS_ADDR(sreg), \
159 .ctrl_mask = cmask, \
160 }
161
162 static struct hi655x_regulator regulators[] = {
163 HI655X_LDO_LINEAR(LDO2, 0x72, 0x07, 0x29, 0x2a, 0x2b, 0x01,
164 2500000, 8, 100000),
165 HI655X_LDO(LDO7, 0x78, 0x07, 0x29, 0x2a, 0x2b, 0x06, ldo7_voltages),
166 HI655X_LDO(LDO10, 0x78, 0x07, 0x29, 0x2a, 0x2b, 0x01, ldo7_voltages),
167 HI655X_LDO_LINEAR(LDO13, 0x7e, 0x07, 0x2c, 0x2d, 0x2e, 0x04,
168 1600000, 8, 50000),
169 HI655X_LDO_LINEAR(LDO14, 0x7f, 0x07, 0x2c, 0x2d, 0x2e, 0x05,
170 2500000, 8, 100000),
171 HI655X_LDO_LINEAR(LDO15, 0x80, 0x07, 0x2c, 0x2d, 0x2e, 0x06,
172 1600000, 8, 50000),
173 HI655X_LDO_LINEAR(LDO17, 0x82, 0x07, 0x2f, 0x30, 0x31, 0x00,
174 2500000, 8, 100000),
175 HI655X_LDO(LDO19, 0x84, 0x07, 0x2f, 0x30, 0x31, 0x02, ldo19_voltages),
176 HI655X_LDO_LINEAR(LDO21, 0x86, 0x07, 0x2f, 0x30, 0x31, 0x04,
177 1650000, 8, 50000),
178 HI655X_LDO(LDO22, 0x87, 0x07, 0x2f, 0x30, 0x31, 0x05, ldo22_voltages),
179 };
180
hi655x_regulator_probe(struct platform_device * pdev)181 static int hi655x_regulator_probe(struct platform_device *pdev)
182 {
183 unsigned int i;
184 struct hi655x_regulator *regulator;
185 struct hi655x_pmic *pmic;
186 struct regulator_config config = { };
187 struct regulator_dev *rdev;
188
189 pmic = dev_get_drvdata(pdev->dev.parent);
190 if (!pmic) {
191 dev_err(&pdev->dev, "no pmic in the regulator parent node\n");
192 return -ENODEV;
193 }
194
195 regulator = devm_kzalloc(&pdev->dev, sizeof(*regulator), GFP_KERNEL);
196 if (!regulator)
197 return -ENOMEM;
198
199 platform_set_drvdata(pdev, regulator);
200
201 config.dev = pdev->dev.parent;
202 config.regmap = pmic->regmap;
203 config.driver_data = regulator;
204 for (i = 0; i < ARRAY_SIZE(regulators); i++) {
205 rdev = devm_regulator_register(&pdev->dev,
206 ®ulators[i].rdesc,
207 &config);
208 if (IS_ERR(rdev)) {
209 dev_err(&pdev->dev, "failed to register regulator %s\n",
210 regulator->rdesc.name);
211 return PTR_ERR(rdev);
212 }
213 }
214 return 0;
215 }
216
217 static const struct platform_device_id hi655x_regulator_table[] = {
218 { .name = "hi655x-regulator" },
219 {},
220 };
221 MODULE_DEVICE_TABLE(platform, hi655x_regulator_table);
222
223 static struct platform_driver hi655x_regulator_driver = {
224 .id_table = hi655x_regulator_table,
225 .driver = {
226 .name = "hi655x-regulator",
227 },
228 .probe = hi655x_regulator_probe,
229 };
230 module_platform_driver(hi655x_regulator_driver);
231
232 MODULE_AUTHOR("Chen Feng <puck.chen@hisilicon.com>");
233 MODULE_DESCRIPTION("Hisilicon Hi655x regulator driver");
234 MODULE_LICENSE("GPL v2");
235