1 // SPDX-License-Identifier: GPL-2.0
2 //
3 // Device driver for regulators in Hi655x IC
4 //
5 // Copyright (c) 2016 HiSilicon Ltd.
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 
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 
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 
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 *) &regulators[i];
186 
187 		rdev = devm_regulator_register(&pdev->dev,
188 					       &regulators[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 		.probe_type = PROBE_PREFER_ASYNCHRONOUS,
210 	},
211 	.probe	= hi655x_regulator_probe,
212 };
213 module_platform_driver(hi655x_regulator_driver);
214 
215 MODULE_AUTHOR("Chen Feng <puck.chen@hisilicon.com>");
216 MODULE_DESCRIPTION("Hisilicon Hi655x regulator driver");
217 MODULE_LICENSE("GPL v2");
218