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(map: rdev->regmap, AS3711_SD_CONTROL_1, |
49 | mask: 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(map: rdev->regmap, AS3711_SD_CONTROL_1, val: &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 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 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 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(node: dev->parent->of_node, name: "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: dev->parent, node: regulators, |
187 | matches: as3711_regulator_matches, num_matches: count); |
188 | of_node_put(node: 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(dev: &pdev->dev); |
206 | struct as3711 *as3711 = dev_get_drvdata(dev: 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(dev: &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(dev: &pdev->dev, regulator_desc: &as3711_reg_desc[id], |
232 | config: &config); |
233 | if (IS_ERR(ptr: rdev)) { |
234 | dev_err(&pdev->dev, "Failed to register regulator %s\n" , |
235 | as3711_reg_desc[id].name); |
236 | return PTR_ERR(ptr: rdev); |
237 | } |
238 | } |
239 | |
240 | return 0; |
241 | } |
242 | |
243 | static struct platform_driver as3711_regulator_driver = { |
244 | .driver = { |
245 | .name = "as3711-regulator" , |
246 | .probe_type = PROBE_PREFER_ASYNCHRONOUS, |
247 | }, |
248 | .probe = as3711_regulator_probe, |
249 | }; |
250 | |
251 | static int __init as3711_regulator_init(void) |
252 | { |
253 | return platform_driver_register(&as3711_regulator_driver); |
254 | } |
255 | subsys_initcall(as3711_regulator_init); |
256 | |
257 | static void __exit as3711_regulator_exit(void) |
258 | { |
259 | platform_driver_unregister(&as3711_regulator_driver); |
260 | } |
261 | module_exit(as3711_regulator_exit); |
262 | |
263 | MODULE_AUTHOR("Guennadi Liakhovetski <g.liakhovetski@gmx.de>" ); |
264 | MODULE_DESCRIPTION("AS3711 regulator driver" ); |
265 | MODULE_ALIAS("platform:as3711-regulator" ); |
266 | MODULE_LICENSE("GPL v2" ); |
267 | |