1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3  * Voltage regulation driver for active-semi ACT8945A PMIC
4  *
5  * Copyright (C) 2015 Atmel Corporation
6  *
7  * Author: Wenyou Yang <wenyou.yang@atmel.com>
8  */
9 
10 #include <linux/module.h>
11 #include <linux/of_device.h>
12 #include <linux/platform_device.h>
13 #include <linux/regmap.h>
14 #include <linux/regulator/driver.h>
15 #include <linux/regulator/machine.h>
16 #include <dt-bindings/regulator/active-semi,8945a-regulator.h>
17 
18 /*
19  * ACT8945A Global Register Map.
20  */
21 #define ACT8945A_SYS_MODE	0x00
22 #define ACT8945A_SYS_CTRL	0x01
23 #define ACT8945A_SYS_UNLK_REGS	0x0b
24 #define ACT8945A_DCDC1_VSET1	0x20
25 #define ACT8945A_DCDC1_VSET2	0x21
26 #define ACT8945A_DCDC1_CTRL	0x22
27 #define ACT8945A_DCDC1_SUS	0x24
28 #define ACT8945A_DCDC2_VSET1	0x30
29 #define ACT8945A_DCDC2_VSET2	0x31
30 #define ACT8945A_DCDC2_CTRL	0x32
31 #define ACT8945A_DCDC2_SUS	0x34
32 #define ACT8945A_DCDC3_VSET1	0x40
33 #define ACT8945A_DCDC3_VSET2	0x41
34 #define ACT8945A_DCDC3_CTRL	0x42
35 #define ACT8945A_DCDC3_SUS	0x44
36 #define ACT8945A_LDO1_VSET	0x50
37 #define ACT8945A_LDO1_CTRL	0x51
38 #define ACT8945A_LDO1_SUS	0x52
39 #define ACT8945A_LDO2_VSET	0x54
40 #define ACT8945A_LDO2_CTRL	0x55
41 #define ACT8945A_LDO2_SUS	0x56
42 #define ACT8945A_LDO3_VSET	0x60
43 #define ACT8945A_LDO3_CTRL	0x61
44 #define ACT8945A_LDO3_SUS	0x62
45 #define ACT8945A_LDO4_VSET	0x64
46 #define ACT8945A_LDO4_CTRL	0x65
47 #define ACT8945A_LDO4_SUS	0x66
48 
49 /*
50  * Field Definitions.
51  */
52 #define ACT8945A_ENA		0x80	/* ON - [7] */
53 #define ACT8945A_VSEL_MASK	0x3F	/* VSET - [5:0] */
54 
55 /*
56  * ACT8945A Voltage Number
57  */
58 #define ACT8945A_VOLTAGE_NUM	64
59 
60 enum {
61 	ACT8945A_ID_DCDC1,
62 	ACT8945A_ID_DCDC2,
63 	ACT8945A_ID_DCDC3,
64 	ACT8945A_ID_LDO1,
65 	ACT8945A_ID_LDO2,
66 	ACT8945A_ID_LDO3,
67 	ACT8945A_ID_LDO4,
68 	ACT8945A_ID_MAX,
69 };
70 
71 struct act8945a_pmic {
72 	struct regmap *regmap;
73 	u32 op_mode[ACT8945A_ID_MAX];
74 };
75 
76 static const struct linear_range act8945a_voltage_ranges[] = {
77 	REGULATOR_LINEAR_RANGE(600000, 0, 23, 25000),
78 	REGULATOR_LINEAR_RANGE(1200000, 24, 47, 50000),
79 	REGULATOR_LINEAR_RANGE(2400000, 48, 63, 100000),
80 };
81 
82 static int act8945a_set_suspend_state(struct regulator_dev *rdev, bool enable)
83 {
84 	struct regmap *regmap = rdev->regmap;
85 	int id = rdev_get_id(rdev);
86 	int reg, val;
87 
88 	switch (id) {
89 	case ACT8945A_ID_DCDC1:
90 		reg = ACT8945A_DCDC1_SUS;
91 		val = 0xa8;
92 		break;
93 	case ACT8945A_ID_DCDC2:
94 		reg = ACT8945A_DCDC2_SUS;
95 		val = 0xa8;
96 		break;
97 	case ACT8945A_ID_DCDC3:
98 		reg = ACT8945A_DCDC3_SUS;
99 		val = 0xa8;
100 		break;
101 	case ACT8945A_ID_LDO1:
102 		reg = ACT8945A_LDO1_SUS;
103 		val = 0xe8;
104 		break;
105 	case ACT8945A_ID_LDO2:
106 		reg = ACT8945A_LDO2_SUS;
107 		val = 0xe8;
108 		break;
109 	case ACT8945A_ID_LDO3:
110 		reg = ACT8945A_LDO3_SUS;
111 		val = 0xe8;
112 		break;
113 	case ACT8945A_ID_LDO4:
114 		reg = ACT8945A_LDO4_SUS;
115 		val = 0xe8;
116 		break;
117 	default:
118 		return -EINVAL;
119 	}
120 
121 	if (enable)
122 		val |= BIT(4);
123 
124 	/*
125 	 * Ask the PMIC to enable/disable this output when entering hibernate
126 	 * mode.
127 	 */
128 	return regmap_write(regmap, reg, val);
129 }
130 
131 static int act8945a_set_suspend_enable(struct regulator_dev *rdev)
132 {
133 	return act8945a_set_suspend_state(rdev, true);
134 }
135 
136 static int act8945a_set_suspend_disable(struct regulator_dev *rdev)
137 {
138 	return act8945a_set_suspend_state(rdev, false);
139 }
140 
141 static unsigned int act8945a_of_map_mode(unsigned int mode)
142 {
143 	switch (mode) {
144 	case ACT8945A_REGULATOR_MODE_FIXED:
145 	case ACT8945A_REGULATOR_MODE_NORMAL:
146 		return REGULATOR_MODE_NORMAL;
147 	case ACT8945A_REGULATOR_MODE_LOWPOWER:
148 		return REGULATOR_MODE_STANDBY;
149 	default:
150 		return REGULATOR_MODE_INVALID;
151 	}
152 }
153 
154 static int act8945a_set_mode(struct regulator_dev *rdev, unsigned int mode)
155 {
156 	struct act8945a_pmic *act8945a = rdev_get_drvdata(rdev);
157 	struct regmap *regmap = rdev->regmap;
158 	int id = rdev_get_id(rdev);
159 	int reg, ret, val = 0;
160 
161 	switch (id) {
162 	case ACT8945A_ID_DCDC1:
163 		reg = ACT8945A_DCDC1_CTRL;
164 		break;
165 	case ACT8945A_ID_DCDC2:
166 		reg = ACT8945A_DCDC2_CTRL;
167 		break;
168 	case ACT8945A_ID_DCDC3:
169 		reg = ACT8945A_DCDC3_CTRL;
170 		break;
171 	case ACT8945A_ID_LDO1:
172 		reg = ACT8945A_LDO1_CTRL;
173 		break;
174 	case ACT8945A_ID_LDO2:
175 		reg = ACT8945A_LDO2_CTRL;
176 		break;
177 	case ACT8945A_ID_LDO3:
178 		reg = ACT8945A_LDO3_CTRL;
179 		break;
180 	case ACT8945A_ID_LDO4:
181 		reg = ACT8945A_LDO4_CTRL;
182 		break;
183 	default:
184 		return -EINVAL;
185 	}
186 
187 	switch (mode) {
188 	case REGULATOR_MODE_STANDBY:
189 		if (id > ACT8945A_ID_DCDC3)
190 			val = BIT(5);
191 		break;
192 	case REGULATOR_MODE_NORMAL:
193 		if (id <= ACT8945A_ID_DCDC3)
194 			val = BIT(5);
195 		break;
196 	default:
197 		return -EINVAL;
198 	}
199 
200 	ret = regmap_update_bits(regmap, reg, BIT(5), val);
201 	if (ret)
202 		return ret;
203 
204 	act8945a->op_mode[id] = mode;
205 
206 	return 0;
207 }
208 
209 static unsigned int act8945a_get_mode(struct regulator_dev *rdev)
210 {
211 	struct act8945a_pmic *act8945a = rdev_get_drvdata(rdev);
212 	int id = rdev_get_id(rdev);
213 
214 	if (id < ACT8945A_ID_DCDC1 || id >= ACT8945A_ID_MAX)
215 		return -EINVAL;
216 
217 	return act8945a->op_mode[id];
218 }
219 
220 static const struct regulator_ops act8945a_ops = {
221 	.list_voltage		= regulator_list_voltage_linear_range,
222 	.map_voltage		= regulator_map_voltage_linear_range,
223 	.get_voltage_sel	= regulator_get_voltage_sel_regmap,
224 	.set_voltage_sel	= regulator_set_voltage_sel_regmap,
225 	.enable			= regulator_enable_regmap,
226 	.disable		= regulator_disable_regmap,
227 	.set_mode		= act8945a_set_mode,
228 	.get_mode		= act8945a_get_mode,
229 	.is_enabled		= regulator_is_enabled_regmap,
230 	.set_suspend_enable	= act8945a_set_suspend_enable,
231 	.set_suspend_disable	= act8945a_set_suspend_disable,
232 };
233 
234 #define ACT89xx_REG(_name, _family, _id, _vsel_reg, _supply)		\
235 	[_family##_ID_##_id] = {					\
236 		.name			= _name,			\
237 		.supply_name		= _supply,			\
238 		.of_match		= of_match_ptr("REG_"#_id),	\
239 		.of_map_mode		= act8945a_of_map_mode,		\
240 		.regulators_node	= of_match_ptr("regulators"),	\
241 		.id			= _family##_ID_##_id,		\
242 		.type			= REGULATOR_VOLTAGE,		\
243 		.ops			= &act8945a_ops,		\
244 		.n_voltages		= ACT8945A_VOLTAGE_NUM,		\
245 		.linear_ranges		= act8945a_voltage_ranges,	\
246 		.n_linear_ranges	= ARRAY_SIZE(act8945a_voltage_ranges), \
247 		.vsel_reg		= _family##_##_id##_##_vsel_reg, \
248 		.vsel_mask		= ACT8945A_VSEL_MASK,		\
249 		.enable_reg		= _family##_##_id##_CTRL,	\
250 		.enable_mask		= ACT8945A_ENA,			\
251 		.owner			= THIS_MODULE,			\
252 	}
253 
254 static const struct regulator_desc act8945a_regulators[] = {
255 	ACT89xx_REG("DCDC_REG1", ACT8945A, DCDC1, VSET1, "vp1"),
256 	ACT89xx_REG("DCDC_REG2", ACT8945A, DCDC2, VSET1, "vp2"),
257 	ACT89xx_REG("DCDC_REG3", ACT8945A, DCDC3, VSET1, "vp3"),
258 	ACT89xx_REG("LDO_REG1", ACT8945A, LDO1, VSET, "inl45"),
259 	ACT89xx_REG("LDO_REG2", ACT8945A, LDO2, VSET, "inl45"),
260 	ACT89xx_REG("LDO_REG3", ACT8945A, LDO3, VSET, "inl67"),
261 	ACT89xx_REG("LDO_REG4", ACT8945A, LDO4, VSET, "inl67"),
262 };
263 
264 static const struct regulator_desc act8945a_alt_regulators[] = {
265 	ACT89xx_REG("DCDC_REG1", ACT8945A, DCDC1, VSET2, "vp1"),
266 	ACT89xx_REG("DCDC_REG2", ACT8945A, DCDC2, VSET2, "vp2"),
267 	ACT89xx_REG("DCDC_REG3", ACT8945A, DCDC3, VSET2, "vp3"),
268 	ACT89xx_REG("LDO_REG1", ACT8945A, LDO1, VSET, "inl45"),
269 	ACT89xx_REG("LDO_REG2", ACT8945A, LDO2, VSET, "inl45"),
270 	ACT89xx_REG("LDO_REG3", ACT8945A, LDO3, VSET, "inl67"),
271 	ACT89xx_REG("LDO_REG4", ACT8945A, LDO4, VSET, "inl67"),
272 };
273 
274 static int act8945a_pmic_probe(struct platform_device *pdev)
275 {
276 	struct regulator_config config = { };
277 	const struct regulator_desc *regulators;
278 	struct act8945a_pmic *act8945a;
279 	struct regulator_dev *rdev;
280 	int i, num_regulators;
281 	bool voltage_select;
282 
283 	act8945a = devm_kzalloc(&pdev->dev, sizeof(*act8945a), GFP_KERNEL);
284 	if (!act8945a)
285 		return -ENOMEM;
286 
287 	act8945a->regmap = dev_get_regmap(pdev->dev.parent, NULL);
288 	if (!act8945a->regmap) {
289 		dev_err(&pdev->dev,
290 			"could not retrieve regmap from parent device\n");
291 		return -EINVAL;
292 	}
293 
294 	voltage_select = of_property_read_bool(pdev->dev.parent->of_node,
295 					       "active-semi,vsel-high");
296 
297 	if (voltage_select) {
298 		regulators = act8945a_alt_regulators;
299 		num_regulators = ARRAY_SIZE(act8945a_alt_regulators);
300 	} else {
301 		regulators = act8945a_regulators;
302 		num_regulators = ARRAY_SIZE(act8945a_regulators);
303 	}
304 
305 	config.dev = &pdev->dev;
306 	config.dev->of_node = pdev->dev.parent->of_node;
307 	config.driver_data = act8945a;
308 	for (i = 0; i < num_regulators; i++) {
309 		rdev = devm_regulator_register(&pdev->dev, &regulators[i],
310 					       &config);
311 		if (IS_ERR(rdev)) {
312 			dev_err(&pdev->dev,
313 				"failed to register %s regulator\n",
314 				regulators[i].name);
315 			return PTR_ERR(rdev);
316 		}
317 	}
318 
319 	platform_set_drvdata(pdev, act8945a);
320 
321 	/* Unlock expert registers. */
322 	return regmap_write(act8945a->regmap, ACT8945A_SYS_UNLK_REGS, 0xef);
323 }
324 
325 static int __maybe_unused act8945a_suspend(struct device *pdev)
326 {
327 	struct act8945a_pmic *act8945a = dev_get_drvdata(pdev);
328 
329 	/*
330 	 * Ask the PMIC to enter the suspend mode on the next PWRHLD
331 	 * transition.
332 	 */
333 	return regmap_write(act8945a->regmap, ACT8945A_SYS_CTRL, 0x42);
334 }
335 
336 static SIMPLE_DEV_PM_OPS(act8945a_pm, act8945a_suspend, NULL);
337 
338 static void act8945a_pmic_shutdown(struct platform_device *pdev)
339 {
340 	struct act8945a_pmic *act8945a = platform_get_drvdata(pdev);
341 
342 	/*
343 	 * Ask the PMIC to shutdown everything on the next PWRHLD transition.
344 	 */
345 	regmap_write(act8945a->regmap, ACT8945A_SYS_CTRL, 0x0);
346 }
347 
348 static struct platform_driver act8945a_pmic_driver = {
349 	.driver = {
350 		.name = "act8945a-regulator",
351 		.probe_type = PROBE_PREFER_ASYNCHRONOUS,
352 		.pm = &act8945a_pm,
353 	},
354 	.probe = act8945a_pmic_probe,
355 	.shutdown = act8945a_pmic_shutdown,
356 };
357 module_platform_driver(act8945a_pmic_driver);
358 
359 MODULE_DESCRIPTION("Active-semi ACT8945A voltage regulator driver");
360 MODULE_AUTHOR("Wenyou Yang <wenyou.yang@atmel.com>");
361 MODULE_LICENSE("GPL");
362