1 // SPDX-License-Identifier: GPL-2.0
2 //
3 // Device driver for regulators in Hi655x IC
4 //
5 // Copyright (c) 2016 Hisilicon.
6 //
7 // Authors:
8 // Chen Feng <puck.chen@hisilicon.com>
9 // Fei Wang <w.f@huawei.com>
10
11 #include <linux/bitops.h>
12 #include <linux/device.h>
13 #include <linux/err.h>
14 #include <linux/module.h>
15 #include <linux/io.h>
16 #include <linux/of.h>
17 #include <linux/platform_device.h>
18 #include <linux/regmap.h>
19 #include <linux/regulator/driver.h>
20 #include <linux/regulator/machine.h>
21 #include <linux/regulator/of_regulator.h>
22 #include <linux/mfd/hi655x-pmic.h>
23
24 struct hi655x_regulator {
25 unsigned int disable_reg;
26 unsigned int status_reg;
27 struct regulator_desc rdesc;
28 };
29
30 /* LDO7 & LDO10 */
31 static const unsigned int ldo7_voltages[] = {
32 1800000, 1850000, 2850000, 2900000,
33 3000000, 3100000, 3200000, 3300000,
34 };
35
36 static const unsigned int ldo19_voltages[] = {
37 1800000, 1850000, 1900000, 1750000,
38 2800000, 2850000, 2900000, 3000000,
39 };
40
41 static const unsigned int ldo22_voltages[] = {
42 900000, 1000000, 1050000, 1100000,
43 1150000, 1175000, 1185000, 1200000,
44 };
45
46 enum hi655x_regulator_id {
47 HI655X_LDO0,
48 HI655X_LDO1,
49 HI655X_LDO2,
50 HI655X_LDO3,
51 HI655X_LDO4,
52 HI655X_LDO5,
53 HI655X_LDO6,
54 HI655X_LDO7,
55 HI655X_LDO8,
56 HI655X_LDO9,
57 HI655X_LDO10,
58 HI655X_LDO11,
59 HI655X_LDO12,
60 HI655X_LDO13,
61 HI655X_LDO14,
62 HI655X_LDO15,
63 HI655X_LDO16,
64 HI655X_LDO17,
65 HI655X_LDO18,
66 HI655X_LDO19,
67 HI655X_LDO20,
68 HI655X_LDO21,
69 HI655X_LDO22,
70 };
71
hi655x_is_enabled(struct regulator_dev * rdev)72 static int hi655x_is_enabled(struct regulator_dev *rdev)
73 {
74 unsigned int value = 0;
75 const struct hi655x_regulator *regulator = rdev_get_drvdata(rdev);
76
77 regmap_read(rdev->regmap, regulator->status_reg, &value);
78 return (value & rdev->desc->enable_mask);
79 }
80
hi655x_disable(struct regulator_dev * rdev)81 static int hi655x_disable(struct regulator_dev *rdev)
82 {
83 const struct hi655x_regulator *regulator = rdev_get_drvdata(rdev);
84
85 return regmap_write(rdev->regmap, regulator->disable_reg,
86 rdev->desc->enable_mask);
87 }
88
89 static const struct regulator_ops hi655x_regulator_ops = {
90 .enable = regulator_enable_regmap,
91 .disable = hi655x_disable,
92 .is_enabled = hi655x_is_enabled,
93 .list_voltage = regulator_list_voltage_table,
94 .get_voltage_sel = regulator_get_voltage_sel_regmap,
95 .set_voltage_sel = regulator_set_voltage_sel_regmap,
96 };
97
98 static const struct regulator_ops hi655x_ldo_linear_ops = {
99 .enable = regulator_enable_regmap,
100 .disable = hi655x_disable,
101 .is_enabled = hi655x_is_enabled,
102 .list_voltage = regulator_list_voltage_linear,
103 .get_voltage_sel = regulator_get_voltage_sel_regmap,
104 .set_voltage_sel = regulator_set_voltage_sel_regmap,
105 };
106
107 #define HI655X_LDO(_ID, vreg, vmask, ereg, dreg, \
108 sreg, cmask, vtable) { \
109 .rdesc = { \
110 .name = #_ID, \
111 .of_match = of_match_ptr(#_ID), \
112 .ops = &hi655x_regulator_ops, \
113 .regulators_node = of_match_ptr("regulators"), \
114 .type = REGULATOR_VOLTAGE, \
115 .id = HI655X_##_ID, \
116 .owner = THIS_MODULE, \
117 .n_voltages = ARRAY_SIZE(vtable), \
118 .volt_table = vtable, \
119 .vsel_reg = HI655X_BUS_ADDR(vreg), \
120 .vsel_mask = vmask, \
121 .enable_reg = HI655X_BUS_ADDR(ereg), \
122 .enable_mask = BIT(cmask), \
123 }, \
124 .disable_reg = HI655X_BUS_ADDR(dreg), \
125 .status_reg = HI655X_BUS_ADDR(sreg), \
126 }
127
128 #define HI655X_LDO_LINEAR(_ID, vreg, vmask, ereg, dreg, \
129 sreg, cmask, minv, nvolt, vstep) { \
130 .rdesc = { \
131 .name = #_ID, \
132 .of_match = of_match_ptr(#_ID), \
133 .ops = &hi655x_ldo_linear_ops, \
134 .regulators_node = of_match_ptr("regulators"), \
135 .type = REGULATOR_VOLTAGE, \
136 .id = HI655X_##_ID, \
137 .owner = THIS_MODULE, \
138 .min_uV = minv, \
139 .n_voltages = nvolt, \
140 .uV_step = vstep, \
141 .vsel_reg = HI655X_BUS_ADDR(vreg), \
142 .vsel_mask = vmask, \
143 .enable_reg = HI655X_BUS_ADDR(ereg), \
144 .enable_mask = BIT(cmask), \
145 }, \
146 .disable_reg = HI655X_BUS_ADDR(dreg), \
147 .status_reg = HI655X_BUS_ADDR(sreg), \
148 }
149
150 static const struct hi655x_regulator regulators[] = {
151 HI655X_LDO_LINEAR(LDO2, 0x72, 0x07, 0x29, 0x2a, 0x2b, 0x01,
152 2500000, 8, 100000),
153 HI655X_LDO(LDO7, 0x78, 0x07, 0x29, 0x2a, 0x2b, 0x06, ldo7_voltages),
154 HI655X_LDO(LDO10, 0x78, 0x07, 0x29, 0x2a, 0x2b, 0x01, ldo7_voltages),
155 HI655X_LDO_LINEAR(LDO13, 0x7e, 0x07, 0x2c, 0x2d, 0x2e, 0x04,
156 1600000, 8, 50000),
157 HI655X_LDO_LINEAR(LDO14, 0x7f, 0x07, 0x2c, 0x2d, 0x2e, 0x05,
158 2500000, 8, 100000),
159 HI655X_LDO_LINEAR(LDO15, 0x80, 0x07, 0x2c, 0x2d, 0x2e, 0x06,
160 1600000, 8, 50000),
161 HI655X_LDO_LINEAR(LDO17, 0x82, 0x07, 0x2f, 0x30, 0x31, 0x00,
162 2500000, 8, 100000),
163 HI655X_LDO(LDO19, 0x84, 0x07, 0x2f, 0x30, 0x31, 0x02, ldo19_voltages),
164 HI655X_LDO_LINEAR(LDO21, 0x86, 0x07, 0x2f, 0x30, 0x31, 0x04,
165 1650000, 8, 50000),
166 HI655X_LDO(LDO22, 0x87, 0x07, 0x2f, 0x30, 0x31, 0x05, ldo22_voltages),
167 };
168
hi655x_regulator_probe(struct platform_device * pdev)169 static int hi655x_regulator_probe(struct platform_device *pdev)
170 {
171 unsigned int i;
172 struct hi655x_pmic *pmic;
173 struct regulator_config config = { };
174 struct regulator_dev *rdev;
175
176 pmic = dev_get_drvdata(pdev->dev.parent);
177 if (!pmic) {
178 dev_err(&pdev->dev, "no pmic in the regulator parent node\n");
179 return -ENODEV;
180 }
181
182 config.dev = pdev->dev.parent;
183 config.regmap = pmic->regmap;
184 for (i = 0; i < ARRAY_SIZE(regulators); i++) {
185 config.driver_data = (void *) ®ulators[i];
186
187 rdev = devm_regulator_register(&pdev->dev,
188 ®ulators[i].rdesc,
189 &config);
190 if (IS_ERR(rdev)) {
191 dev_err(&pdev->dev, "failed to register regulator %s\n",
192 regulators[i].rdesc.name);
193 return PTR_ERR(rdev);
194 }
195 }
196 return 0;
197 }
198
199 static const struct platform_device_id hi655x_regulator_table[] = {
200 { .name = "hi655x-regulator" },
201 {},
202 };
203 MODULE_DEVICE_TABLE(platform, hi655x_regulator_table);
204
205 static struct platform_driver hi655x_regulator_driver = {
206 .id_table = hi655x_regulator_table,
207 .driver = {
208 .name = "hi655x-regulator",
209 },
210 .probe = hi655x_regulator_probe,
211 };
212 module_platform_driver(hi655x_regulator_driver);
213
214 MODULE_AUTHOR("Chen Feng <puck.chen@hisilicon.com>");
215 MODULE_DESCRIPTION("Hisilicon Hi655x regulator driver");
216 MODULE_LICENSE("GPL v2");
217