1 // SPDX-License-Identifier: GPL-2.0
2 /*
3  * AS3711 PMIC regulator driver, using DCDC Step Down and LDO supplies
4  *
5  * Copyright (C) 2012 Renesas Electronics Corporation
6  * Author: Guennadi Liakhovetski, <g.liakhovetski@gmx.de>
7  */
8 
9 #include <linux/err.h>
10 #include <linux/init.h>
11 #include <linux/mfd/as3711.h>
12 #include <linux/module.h>
13 #include <linux/of.h>
14 #include <linux/platform_device.h>
15 #include <linux/regmap.h>
16 #include <linux/regulator/driver.h>
17 #include <linux/regulator/of_regulator.h>
18 #include <linux/slab.h>
19 
20 /*
21  * The regulator API supports 4 modes of operataion: FAST, NORMAL, IDLE and
22  * STANDBY. We map them in the following way to AS3711 SD1-4 DCDC modes:
23  * FAST:	sdX_fast=1
24  * NORMAL:	low_noise=1
25  * IDLE:	low_noise=0
26  */
27 
28 static int as3711_set_mode_sd(struct regulator_dev *rdev, unsigned int mode)
29 {
30 	unsigned int fast_bit = rdev->desc->enable_mask,
31 		low_noise_bit = fast_bit << 4;
32 	u8 val;
33 
34 	switch (mode) {
35 	case REGULATOR_MODE_FAST:
36 		val = fast_bit | low_noise_bit;
37 		break;
38 	case REGULATOR_MODE_NORMAL:
39 		val = low_noise_bit;
40 		break;
41 	case REGULATOR_MODE_IDLE:
42 		val = 0;
43 		break;
44 	default:
45 		return -EINVAL;
46 	}
47 
48 	return regmap_update_bits(rdev->regmap, AS3711_SD_CONTROL_1,
49 				  low_noise_bit | fast_bit, val);
50 }
51 
52 static unsigned int as3711_get_mode_sd(struct regulator_dev *rdev)
53 {
54 	unsigned int fast_bit = rdev->desc->enable_mask,
55 		low_noise_bit = fast_bit << 4, mask = fast_bit | low_noise_bit;
56 	unsigned int val;
57 	int ret = regmap_read(rdev->regmap, AS3711_SD_CONTROL_1, &val);
58 
59 	if (ret < 0)
60 		return ret;
61 
62 	if ((val & mask) == mask)
63 		return REGULATOR_MODE_FAST;
64 
65 	if ((val & mask) == low_noise_bit)
66 		return REGULATOR_MODE_NORMAL;
67 
68 	if (!(val & mask))
69 		return REGULATOR_MODE_IDLE;
70 
71 	return -EINVAL;
72 }
73 
74 static const struct regulator_ops as3711_sd_ops = {
75 	.is_enabled		= regulator_is_enabled_regmap,
76 	.enable			= regulator_enable_regmap,
77 	.disable		= regulator_disable_regmap,
78 	.get_voltage_sel	= regulator_get_voltage_sel_regmap,
79 	.set_voltage_sel	= regulator_set_voltage_sel_regmap,
80 	.list_voltage		= regulator_list_voltage_linear_range,
81 	.map_voltage		= regulator_map_voltage_linear_range,
82 	.get_mode		= as3711_get_mode_sd,
83 	.set_mode		= as3711_set_mode_sd,
84 };
85 
86 static const struct regulator_ops as3711_aldo_ops = {
87 	.is_enabled		= regulator_is_enabled_regmap,
88 	.enable			= regulator_enable_regmap,
89 	.disable		= regulator_disable_regmap,
90 	.get_voltage_sel	= regulator_get_voltage_sel_regmap,
91 	.set_voltage_sel	= regulator_set_voltage_sel_regmap,
92 	.list_voltage		= regulator_list_voltage_linear_range,
93 	.map_voltage		= regulator_map_voltage_linear_range,
94 };
95 
96 static const struct regulator_ops as3711_dldo_ops = {
97 	.is_enabled		= regulator_is_enabled_regmap,
98 	.enable			= regulator_enable_regmap,
99 	.disable		= regulator_disable_regmap,
100 	.get_voltage_sel	= regulator_get_voltage_sel_regmap,
101 	.set_voltage_sel	= regulator_set_voltage_sel_regmap,
102 	.list_voltage		= regulator_list_voltage_linear_range,
103 	.map_voltage		= regulator_map_voltage_linear_range,
104 };
105 
106 static const struct regulator_linear_range as3711_sd_ranges[] = {
107 	REGULATOR_LINEAR_RANGE(612500, 0x1, 0x40, 12500),
108 	REGULATOR_LINEAR_RANGE(1425000, 0x41, 0x70, 25000),
109 	REGULATOR_LINEAR_RANGE(2650000, 0x71, 0x7f, 50000),
110 };
111 
112 static const struct regulator_linear_range as3711_aldo_ranges[] = {
113 	REGULATOR_LINEAR_RANGE(1200000, 0, 0xf, 50000),
114 	REGULATOR_LINEAR_RANGE(1800000, 0x10, 0x1f, 100000),
115 };
116 
117 static const struct regulator_linear_range as3711_dldo_ranges[] = {
118 	REGULATOR_LINEAR_RANGE(900000, 0, 0x10, 50000),
119 	REGULATOR_LINEAR_RANGE(1750000, 0x20, 0x3f, 50000),
120 };
121 
122 #define AS3711_REG(_id, _en_reg, _en_bit, _vmask, _sfx)			   \
123 	[AS3711_REGULATOR_ ## _id] = {					   \
124 		.name = "as3711-regulator-" # _id,			   \
125 		.id = AS3711_REGULATOR_ ## _id,				   \
126 		.n_voltages = (_vmask + 1),				   \
127 		.ops = &as3711_ ## _sfx ## _ops,			   \
128 		.type = REGULATOR_VOLTAGE,				   \
129 		.owner = THIS_MODULE,					   \
130 		.vsel_reg = AS3711_ ## _id ## _VOLTAGE,			   \
131 		.vsel_mask = _vmask,					   \
132 		.enable_reg = AS3711_ ## _en_reg,			   \
133 		.enable_mask = BIT(_en_bit),				   \
134 		.linear_ranges = as3711_ ## _sfx ## _ranges,		   \
135 		.n_linear_ranges = ARRAY_SIZE(as3711_ ## _sfx ## _ranges), \
136 }
137 
138 static const struct regulator_desc as3711_reg_desc[] = {
139 	AS3711_REG(SD_1, SD_CONTROL, 0, 0x7f, sd),
140 	AS3711_REG(SD_2, SD_CONTROL, 1, 0x7f, sd),
141 	AS3711_REG(SD_3, SD_CONTROL, 2, 0x7f, sd),
142 	AS3711_REG(SD_4, SD_CONTROL, 3, 0x7f, sd),
143 	AS3711_REG(LDO_1, LDO_1_VOLTAGE, 7, 0x1f, aldo),
144 	AS3711_REG(LDO_2, LDO_2_VOLTAGE, 7, 0x1f, aldo),
145 	AS3711_REG(LDO_3, LDO_3_VOLTAGE, 7, 0x3f, dldo),
146 	AS3711_REG(LDO_4, LDO_4_VOLTAGE, 7, 0x3f, dldo),
147 	AS3711_REG(LDO_5, LDO_5_VOLTAGE, 7, 0x3f, dldo),
148 	AS3711_REG(LDO_6, LDO_6_VOLTAGE, 7, 0x3f, dldo),
149 	AS3711_REG(LDO_7, LDO_7_VOLTAGE, 7, 0x3f, dldo),
150 	AS3711_REG(LDO_8, LDO_8_VOLTAGE, 7, 0x3f, dldo),
151 	/* StepUp output voltage depends on supplying regulator */
152 };
153 
154 #define AS3711_REGULATOR_NUM ARRAY_SIZE(as3711_reg_desc)
155 
156 static struct of_regulator_match
157 as3711_regulator_matches[AS3711_REGULATOR_NUM] = {
158 	[AS3711_REGULATOR_SD_1] = { .name = "sd1" },
159 	[AS3711_REGULATOR_SD_2] = { .name = "sd2" },
160 	[AS3711_REGULATOR_SD_3] = { .name = "sd3" },
161 	[AS3711_REGULATOR_SD_4] = { .name = "sd4" },
162 	[AS3711_REGULATOR_LDO_1] = { .name = "ldo1" },
163 	[AS3711_REGULATOR_LDO_2] = { .name = "ldo2" },
164 	[AS3711_REGULATOR_LDO_3] = { .name = "ldo3" },
165 	[AS3711_REGULATOR_LDO_4] = { .name = "ldo4" },
166 	[AS3711_REGULATOR_LDO_5] = { .name = "ldo5" },
167 	[AS3711_REGULATOR_LDO_6] = { .name = "ldo6" },
168 	[AS3711_REGULATOR_LDO_7] = { .name = "ldo7" },
169 	[AS3711_REGULATOR_LDO_8] = { .name = "ldo8" },
170 };
171 
172 static int as3711_regulator_parse_dt(struct device *dev,
173 				struct device_node **of_node, const int count)
174 {
175 	struct as3711_regulator_pdata *pdata = dev_get_platdata(dev);
176 	struct device_node *regulators =
177 		of_get_child_by_name(dev->parent->of_node, "regulators");
178 	struct of_regulator_match *match;
179 	int ret, i;
180 
181 	if (!regulators) {
182 		dev_err(dev, "regulator node not found\n");
183 		return -ENODEV;
184 	}
185 
186 	ret = of_regulator_match(dev->parent, regulators,
187 				 as3711_regulator_matches, count);
188 	of_node_put(regulators);
189 	if (ret < 0) {
190 		dev_err(dev, "Error parsing regulator init data: %d\n", ret);
191 		return ret;
192 	}
193 
194 	for (i = 0, match = as3711_regulator_matches; i < count; i++, match++)
195 		if (match->of_node) {
196 			pdata->init_data[i] = match->init_data;
197 			of_node[i] = match->of_node;
198 		}
199 
200 	return 0;
201 }
202 
203 static int as3711_regulator_probe(struct platform_device *pdev)
204 {
205 	struct as3711_regulator_pdata *pdata = dev_get_platdata(&pdev->dev);
206 	struct as3711 *as3711 = dev_get_drvdata(pdev->dev.parent);
207 	struct regulator_config config = {.dev = &pdev->dev,};
208 	struct device_node *of_node[AS3711_REGULATOR_NUM] = {};
209 	struct regulator_dev *rdev;
210 	int ret;
211 	int id;
212 
213 	if (!pdata) {
214 		dev_err(&pdev->dev, "No platform data...\n");
215 		return -ENODEV;
216 	}
217 
218 	if (pdev->dev.parent->of_node) {
219 		ret = as3711_regulator_parse_dt(&pdev->dev, of_node, AS3711_REGULATOR_NUM);
220 		if (ret < 0) {
221 			dev_err(&pdev->dev, "DT parsing failed: %d\n", ret);
222 			return ret;
223 		}
224 	}
225 
226 	for (id = 0; id < AS3711_REGULATOR_NUM; id++) {
227 		config.init_data = pdata->init_data[id];
228 		config.regmap = as3711->regmap;
229 		config.of_node = of_node[id];
230 
231 		rdev = devm_regulator_register(&pdev->dev, &as3711_reg_desc[id],
232 					       &config);
233 		if (IS_ERR(rdev)) {
234 			dev_err(&pdev->dev, "Failed to register regulator %s\n",
235 				as3711_reg_desc[id].name);
236 			return PTR_ERR(rdev);
237 		}
238 	}
239 
240 	return 0;
241 }
242 
243 static struct platform_driver as3711_regulator_driver = {
244 	.driver	= {
245 		.name	= "as3711-regulator",
246 	},
247 	.probe		= as3711_regulator_probe,
248 };
249 
250 static int __init as3711_regulator_init(void)
251 {
252 	return platform_driver_register(&as3711_regulator_driver);
253 }
254 subsys_initcall(as3711_regulator_init);
255 
256 static void __exit as3711_regulator_exit(void)
257 {
258 	platform_driver_unregister(&as3711_regulator_driver);
259 }
260 module_exit(as3711_regulator_exit);
261 
262 MODULE_AUTHOR("Guennadi Liakhovetski <g.liakhovetski@gmx.de>");
263 MODULE_DESCRIPTION("AS3711 regulator driver");
264 MODULE_ALIAS("platform:as3711-regulator");
265 MODULE_LICENSE("GPL v2");
266