summaryrefslogtreecommitdiffstats
path: root/drivers/regulator/act8945a-regulator.c
blob: 24cbdd8338630b9cc84fd92a075fd9738152f06c (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * Voltage regulation driver for active-semi ACT8945A PMIC
 *
 * Copyright (C) 2015 Atmel Corporation
 *
 * Author: Wenyou Yang <wenyou.yang@atmel.com>
 */

#include <linux/module.h>
#include <linux/of.h>
#include <linux/platform_device.h>
#include <linux/regmap.h>
#include <linux/regulator/driver.h>
#include <linux/regulator/machine.h>
#include <dt-bindings/regulator/active-semi,8945a-regulator.h>

/*
 * ACT8945A Global Register Map.
 */
#define ACT8945A_SYS_MODE	0x00
#define ACT8945A_SYS_CTRL	0x01
#define ACT8945A_SYS_UNLK_REGS	0x0b
#define ACT8945A_DCDC1_VSET1	0x20
#define ACT8945A_DCDC1_VSET2	0x21
#define ACT8945A_DCDC1_CTRL	0x22
#define ACT8945A_DCDC1_SUS	0x24
#define ACT8945A_DCDC2_VSET1	0x30
#define ACT8945A_DCDC2_VSET2	0x31
#define ACT8945A_DCDC2_CTRL	0x32
#define ACT8945A_DCDC2_SUS	0x34
#define ACT8945A_DCDC3_VSET1	0x40
#define ACT8945A_DCDC3_VSET2	0x41
#define ACT8945A_DCDC3_CTRL	0x42
#define ACT8945A_DCDC3_SUS	0x44
#define ACT8945A_LDO1_VSET	0x50
#define ACT8945A_LDO1_CTRL	0x51
#define ACT8945A_LDO1_SUS	0x52
#define ACT8945A_LDO2_VSET	0x54
#define ACT8945A_LDO2_CTRL	0x55
#define ACT8945A_LDO2_SUS	0x56
#define ACT8945A_LDO3_VSET	0x60
#define ACT8945A_LDO3_CTRL	0x61
#define ACT8945A_LDO3_SUS	0x62
#define ACT8945A_LDO4_VSET	0x64
#define ACT8945A_LDO4_CTRL	0x65
#define ACT8945A_LDO4_SUS	0x66

/*
 * Field Definitions.
 */
#define ACT8945A_ENA		0x80	/* ON - [7] */
#define ACT8945A_VSEL_MASK	0x3F	/* VSET - [5:0] */

/*
 * ACT8945A Voltage Number
 */
#define ACT8945A_VOLTAGE_NUM	64

enum {
	ACT8945A_ID_DCDC1,
	ACT8945A_ID_DCDC2,
	ACT8945A_ID_DCDC3,
	ACT8945A_ID_LDO1,
	ACT8945A_ID_LDO2,
	ACT8945A_ID_LDO3,
	ACT8945A_ID_LDO4,
	ACT8945A_ID_MAX,
};

struct act8945a_pmic {
	struct regmap *regmap;
	u32 op_mode[ACT8945A_ID_MAX];
};

static const struct linear_range act8945a_voltage_ranges[] = {
	REGULATOR_LINEAR_RANGE(600000, 0, 23, 25000),
	REGULATOR_LINEAR_RANGE(1200000, 24, 47, 50000),
	REGULATOR_LINEAR_RANGE(2400000, 48, 63, 100000),
};

static int act8945a_set_suspend_state(struct regulator_dev *rdev, bool enable)
{
	struct regmap *regmap = rdev->regmap;
	int id = rdev_get_id(rdev);
	int reg, val;

	switch (id) {
	case ACT8945A_ID_DCDC1:
		reg = ACT8945A_DCDC1_SUS;
		val = 0xa8;
		break;
	case ACT8945A_ID_DCDC2:
		reg = ACT8945A_DCDC2_SUS;
		val = 0xa8;
		break;
	case ACT8945A_ID_DCDC3:
		reg = ACT8945A_DCDC3_SUS;
		val = 0xa8;
		break;
	case ACT8945A_ID_LDO1:
		reg = ACT8945A_LDO1_SUS;
		val = 0xe8;
		break;
	case ACT8945A_ID_LDO2:
		reg = ACT8945A_LDO2_SUS;
		val = 0xe8;
		break;
	case ACT8945A_ID_LDO3:
		reg = ACT8945A_LDO3_SUS;
		val = 0xe8;
		break;
	case ACT8945A_ID_LDO4:
		reg = ACT8945A_LDO4_SUS;
		val = 0xe8;
		break;
	default:
		return -EINVAL;
	}

	if (enable)
		val |= BIT(4);

	/*
	 * Ask the PMIC to enable/disable this output when entering hibernate
	 * mode.
	 */
	return regmap_write(regmap, reg, val);
}

static int act8945a_set_suspend_enable(struct regulator_dev *rdev)
{
	return act8945a_set_suspend_state(rdev, true);
}

static int act8945a_set_suspend_disable(struct regulator_dev *rdev)
{
	return act8945a_set_suspend_state(rdev, false);
}

static unsigned int act8945a_of_map_mode(unsigned int mode)
{
	switch (mode) {
	case ACT8945A_REGULATOR_MODE_FIXED:
	case ACT8945A_REGULATOR_MODE_NORMAL:
		return REGULATOR_MODE_NORMAL;
	case ACT8945A_REGULATOR_MODE_LOWPOWER:
		return REGULATOR_MODE_STANDBY;
	default:
		return REGULATOR_MODE_INVALID;
	}
}

static int act8945a_set_mode(struct regulator_dev *rdev, unsigned int mode)
{
	struct act8945a_pmic *act8945a = rdev_get_drvdata(rdev);
	struct regmap *regmap = rdev->regmap;
	int id = rdev_get_id(rdev);
	int reg, ret, val = 0;

	switch (id) {
	case ACT8945A_ID_DCDC1:
		reg = ACT8945A_DCDC1_CTRL;
		break;
	case ACT8945A_ID_DCDC2:
		reg = ACT8945A_DCDC2_CTRL;
		break;
	case ACT8945A_ID_DCDC3:
		reg = ACT8945A_DCDC3_CTRL;
		break;
	case ACT8945A_ID_LDO1:
		reg = ACT8945A_LDO1_CTRL;
		break;
	case ACT8945A_ID_LDO2:
		reg = ACT8945A_LDO2_CTRL;
		break;
	case ACT8945A_ID_LDO3:
		reg = ACT8945A_LDO3_CTRL;
		break;
	case ACT8945A_ID_LDO4:
		reg = ACT8945A_LDO4_CTRL;
		break;
	default:
		return -EINVAL;
	}

	switch (mode) {
	case REGULATOR_MODE_STANDBY:
		if (id > ACT8945A_ID_DCDC3)
			val = BIT(5);
		break;
	case REGULATOR_MODE_NORMAL:
		if (id <= ACT8945A_ID_DCDC3)
			val = BIT(5);
		break;
	default:
		return -EINVAL;
	}

	ret = regmap_update_bits(regmap, reg, BIT(5), val);
	if (ret)
		return ret;

	act8945a->op_mode[id] = mode;

	return 0;
}

static unsigned int act8945a_get_mode(struct regulator_dev *rdev)
{
	struct act8945a_pmic *act8945a = rdev_get_drvdata(rdev);
	int id = rdev_get_id(rdev);

	if (id < ACT8945A_ID_DCDC1 || id >= ACT8945A_ID_MAX)
		return -EINVAL;

	return act8945a->op_mode[id];
}

static const struct regulator_ops act8945a_ops = {
	.list_voltage		= regulator_list_voltage_linear_range,
	.map_voltage		= regulator_map_voltage_linear_range,
	.get_voltage_sel	= regulator_get_voltage_sel_regmap,
	.set_voltage_sel	= regulator_set_voltage_sel_regmap,
	.enable			= regulator_enable_regmap,
	.disable		= regulator_disable_regmap,
	.set_mode		= act8945a_set_mode,
	.get_mode		= act8945a_get_mode,
	.is_enabled		= regulator_is_enabled_regmap,
	.set_suspend_enable	= act8945a_set_suspend_enable,
	.set_suspend_disable	= act8945a_set_suspend_disable,
};

#define ACT89xx_REG(_name, _family, _id, _vsel_reg, _supply)		\
	[_family##_ID_##_id] = {					\
		.name			= _name,			\
		.supply_name		= _supply,			\
		.of_match		= of_match_ptr("REG_"#_id),	\
		.of_map_mode		= act8945a_of_map_mode,		\
		.regulators_node	= of_match_ptr("regulators"),	\
		.id			= _family##_ID_##_id,		\
		.type			= REGULATOR_VOLTAGE,		\
		.ops			= &act8945a_ops,		\
		.n_voltages		= ACT8945A_VOLTAGE_NUM,		\
		.linear_ranges		= act8945a_voltage_ranges,	\
		.n_linear_ranges	= ARRAY_SIZE(act8945a_voltage_ranges), \
		.vsel_reg		= _family##_##_id##_##_vsel_reg, \
		.vsel_mask		= ACT8945A_VSEL_MASK,		\
		.enable_reg		= _family##_##_id##_CTRL,	\
		.enable_mask		= ACT8945A_ENA,			\
		.owner			= THIS_MODULE,			\
	}

static const struct regulator_desc act8945a_regulators[] = {
	ACT89xx_REG("DCDC_REG1", ACT8945A, DCDC1, VSET1, "vp1"),
	ACT89xx_REG("DCDC_REG2", ACT8945A, DCDC2, VSET1, "vp2"),
	ACT89xx_REG("DCDC_REG3", ACT8945A, DCDC3, VSET1, "vp3"),
	ACT89xx_REG("LDO_REG1", ACT8945A, LDO1, VSET, "inl45"),
	ACT89xx_REG("LDO_REG2", ACT8945A, LDO2, VSET, "inl45"),
	ACT89xx_REG("LDO_REG3", ACT8945A, LDO3, VSET, "inl67"),
	ACT89xx_REG("LDO_REG4", ACT8945A, LDO4, VSET, "inl67"),
};

static const struct regulator_desc act8945a_alt_regulators[] = {
	ACT89xx_REG("DCDC_REG1", ACT8945A, DCDC1, VSET2, "vp1"),
	ACT89xx_REG("DCDC_REG2", ACT8945A, DCDC2, VSET2, "vp2"),
	ACT89xx_REG("DCDC_REG3", ACT8945A, DCDC3, VSET2, "vp3"),
	ACT89xx_REG("LDO_REG1", ACT8945A, LDO1, VSET, "inl45"),
	ACT89xx_REG("LDO_REG2", ACT8945A, LDO2, VSET, "inl45"),
	ACT89xx_REG("LDO_REG3", ACT8945A, LDO3, VSET, "inl67"),
	ACT89xx_REG("LDO_REG4", ACT8945A, LDO4, VSET, "inl67"),
};

static int act8945a_pmic_probe(struct platform_device *pdev)
{
	struct regulator_config config = { };
	const struct regulator_desc *regulators;
	struct act8945a_pmic *act8945a;
	struct regulator_dev *rdev;
	int i, num_regulators;
	bool voltage_select;

	act8945a = devm_kzalloc(&pdev->dev, sizeof(*act8945a), GFP_KERNEL);
	if (!act8945a)
		return -ENOMEM;

	act8945a->regmap = dev_get_regmap(pdev->dev.parent, NULL);
	if (!act8945a->regmap) {
		dev_err(&pdev->dev,
			"could not retrieve regmap from parent device\n");
		return -EINVAL;
	}

	voltage_select = of_property_read_bool(pdev->dev.parent->of_node,
					       "active-semi,vsel-high");

	if (voltage_select) {
		regulators = act8945a_alt_regulators;
		num_regulators = ARRAY_SIZE(act8945a_alt_regulators);
	} else {
		regulators = act8945a_regulators;
		num_regulators = ARRAY_SIZE(act8945a_regulators);
	}

	config.dev = &pdev->dev;
	config.dev->of_node = pdev->dev.parent->of_node;
	config.driver_data = act8945a;
	for (i = 0; i < num_regulators; i++) {
		rdev = devm_regulator_register(&pdev->dev, &regulators[i],
					       &config);
		if (IS_ERR(rdev)) {
			dev_err(&pdev->dev,
				"failed to register %s regulator\n",
				regulators[i].name);
			return PTR_ERR(rdev);
		}
	}

	platform_set_drvdata(pdev, act8945a);

	/* Unlock expert registers. */
	return regmap_write(act8945a->regmap, ACT8945A_SYS_UNLK_REGS, 0xef);
}

static int __maybe_unused act8945a_suspend(struct device *pdev)
{
	struct act8945a_pmic *act8945a = dev_get_drvdata(pdev);

	/*
	 * Ask the PMIC to enter the suspend mode on the next PWRHLD
	 * transition.
	 */
	return regmap_write(act8945a->regmap, ACT8945A_SYS_CTRL, 0x42);
}

static SIMPLE_DEV_PM_OPS(act8945a_pm, act8945a_suspend, NULL);

static void act8945a_pmic_shutdown(struct platform_device *pdev)
{
	struct act8945a_pmic *act8945a = platform_get_drvdata(pdev);

	/*
	 * Ask the PMIC to shutdown everything on the next PWRHLD transition.
	 */
	regmap_write(act8945a->regmap, ACT8945A_SYS_CTRL, 0x0);
}

static struct platform_driver act8945a_pmic_driver = {
	.driver = {
		.name = "act8945a-regulator",
		.probe_type = PROBE_PREFER_ASYNCHRONOUS,
		.pm = &act8945a_pm,
	},
	.probe = act8945a_pmic_probe,
	.shutdown = act8945a_pmic_shutdown,
};
module_platform_driver(act8945a_pmic_driver);

MODULE_DESCRIPTION("Active-semi ACT8945A voltage regulator driver");
MODULE_AUTHOR("Wenyou Yang <wenyou.yang@atmel.com>");
MODULE_LICENSE("GPL");