summaryrefslogtreecommitdiffstats
path: root/drivers/regulator/mt6315-regulator.c
blob: 2608a6652d778525b9817523f8252599428de53b (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
// SPDX-License-Identifier: GPL-2.0
//
// Copyright (c) 2021 MediaTek Inc.

#include <linux/module.h>
#include <linux/of.h>
#include <linux/regmap.h>
#include <linux/regulator/driver.h>
#include <linux/regulator/machine.h>
#include <linux/regulator/mt6315-regulator.h>
#include <linux/regulator/of_regulator.h>
#include <linux/spmi.h>

#define MT6315_BUCK_MODE_AUTO		0
#define MT6315_BUCK_MODE_FORCE_PWM	1
#define MT6315_BUCK_MODE_LP		2

struct mt6315_regulator_info {
	struct regulator_desc desc;
	u32 status_reg;
	u32 lp_mode_mask;
	u32 lp_mode_shift;
};

struct mt_regulator_init_data {
	u32 modeset_mask[MT6315_VBUCK_MAX];
};

struct mt6315_chip {
	struct device *dev;
	struct regmap *regmap;
};

#define MT_BUCK(_name, _bid, _vsel)				\
[_bid] = {							\
	.desc = {						\
		.name = _name,					\
		.of_match = of_match_ptr(_name),		\
		.regulators_node = "regulators",		\
		.ops = &mt6315_volt_range_ops,			\
		.type = REGULATOR_VOLTAGE,			\
		.id = _bid,					\
		.owner = THIS_MODULE,				\
		.n_voltages = 0xc0,				\
		.linear_ranges = mt_volt_range1,		\
		.n_linear_ranges = ARRAY_SIZE(mt_volt_range1),	\
		.vsel_reg = _vsel,				\
		.vsel_mask = 0xff,				\
		.enable_reg = MT6315_BUCK_TOP_CON0,		\
		.enable_mask = BIT(_bid),			\
		.of_map_mode = mt6315_map_mode,			\
	},							\
	.status_reg = _bid##_DBG4,				\
	.lp_mode_mask = BIT(_bid),				\
	.lp_mode_shift = _bid,					\
}

static const struct linear_range mt_volt_range1[] = {
	REGULATOR_LINEAR_RANGE(0, 0, 0xbf, 6250),
};

static unsigned int mt6315_map_mode(unsigned int mode)
{
	switch (mode) {
	case MT6315_BUCK_MODE_AUTO:
		return REGULATOR_MODE_NORMAL;
	case MT6315_BUCK_MODE_FORCE_PWM:
		return REGULATOR_MODE_FAST;
	case MT6315_BUCK_MODE_LP:
		return REGULATOR_MODE_IDLE;
	default:
		return REGULATOR_MODE_INVALID;
	}
}

static unsigned int mt6315_regulator_get_mode(struct regulator_dev *rdev)
{
	struct mt_regulator_init_data *init = rdev_get_drvdata(rdev);
	const struct mt6315_regulator_info *info;
	int ret, regval;
	u32 modeset_mask;

	info = container_of(rdev->desc, struct mt6315_regulator_info, desc);
	modeset_mask = init->modeset_mask[rdev_get_id(rdev)];
	ret = regmap_read(rdev->regmap, MT6315_BUCK_TOP_4PHASE_ANA_CON42, &regval);
	if (ret != 0) {
		dev_err(&rdev->dev, "Failed to get mode: %d\n", ret);
		return ret;
	}

	if ((regval & modeset_mask) == modeset_mask)
		return REGULATOR_MODE_FAST;

	ret = regmap_read(rdev->regmap, MT6315_BUCK_TOP_CON1, &regval);
	if (ret != 0) {
		dev_err(&rdev->dev, "Failed to get lp mode: %d\n", ret);
		return ret;
	}

	if (regval & info->lp_mode_mask)
		return REGULATOR_MODE_IDLE;
	else
		return REGULATOR_MODE_NORMAL;
}

static int mt6315_regulator_set_mode(struct regulator_dev *rdev,
				     u32 mode)
{
	struct mt_regulator_init_data *init = rdev_get_drvdata(rdev);
	const struct mt6315_regulator_info *info;
	int ret, val, curr_mode;
	u32 modeset_mask;

	info = container_of(rdev->desc, struct mt6315_regulator_info, desc);
	modeset_mask = init->modeset_mask[rdev_get_id(rdev)];
	curr_mode = mt6315_regulator_get_mode(rdev);
	switch (mode) {
	case REGULATOR_MODE_FAST:
		ret = regmap_update_bits(rdev->regmap,
					 MT6315_BUCK_TOP_4PHASE_ANA_CON42,
					 modeset_mask,
					 modeset_mask);
		break;
	case REGULATOR_MODE_NORMAL:
		if (curr_mode == REGULATOR_MODE_FAST) {
			ret = regmap_update_bits(rdev->regmap,
						 MT6315_BUCK_TOP_4PHASE_ANA_CON42,
						 modeset_mask,
						 0);
		} else if (curr_mode == REGULATOR_MODE_IDLE) {
			ret = regmap_update_bits(rdev->regmap,
						 MT6315_BUCK_TOP_CON1,
						 info->lp_mode_mask,
						 0);
			usleep_range(100, 110);
		} else {
			ret = -EINVAL;
		}
		break;
	case REGULATOR_MODE_IDLE:
		val = MT6315_BUCK_MODE_LP >> 1;
		val <<= info->lp_mode_shift;
		ret = regmap_update_bits(rdev->regmap,
					 MT6315_BUCK_TOP_CON1,
					 info->lp_mode_mask,
					 val);
		break;
	default:
		ret = -EINVAL;
		dev_err(&rdev->dev, "Unsupported mode: %d\n", mode);
		break;
	}

	if (ret != 0) {
		dev_err(&rdev->dev, "Failed to set mode: %d\n", ret);
		return ret;
	}

	return 0;
}

static int mt6315_get_status(struct regulator_dev *rdev)
{
	const struct mt6315_regulator_info *info;
	int ret;
	u32 regval;

	info = container_of(rdev->desc, struct mt6315_regulator_info, desc);
	ret = regmap_read(rdev->regmap, info->status_reg, &regval);
	if (ret < 0) {
		dev_err(&rdev->dev, "Failed to get enable reg: %d\n", ret);
		return ret;
	}

	return (regval & BIT(0)) ? REGULATOR_STATUS_ON : REGULATOR_STATUS_OFF;
}

static const struct regulator_ops mt6315_volt_range_ops = {
	.list_voltage = regulator_list_voltage_linear_range,
	.map_voltage = regulator_map_voltage_linear_range,
	.set_voltage_sel = regulator_set_voltage_sel_regmap,
	.get_voltage_sel = regulator_get_voltage_sel_regmap,
	.set_voltage_time_sel = regulator_set_voltage_time_sel,
	.enable = regulator_enable_regmap,
	.disable = regulator_disable_regmap,
	.is_enabled = regulator_is_enabled_regmap,
	.get_status = mt6315_get_status,
	.set_mode = mt6315_regulator_set_mode,
	.get_mode = mt6315_regulator_get_mode,
};

static const struct mt6315_regulator_info mt6315_regulators[MT6315_VBUCK_MAX] = {
	MT_BUCK("vbuck1", MT6315_VBUCK1, MT6315_BUCK_TOP_ELR0),
	MT_BUCK("vbuck2", MT6315_VBUCK2, MT6315_BUCK_TOP_ELR2),
	MT_BUCK("vbuck3", MT6315_VBUCK3, MT6315_BUCK_TOP_ELR4),
	MT_BUCK("vbuck4", MT6315_VBUCK4, MT6315_BUCK_TOP_ELR6),
};

static const struct regmap_config mt6315_regmap_config = {
	.reg_bits	= 16,
	.val_bits	= 8,
	.max_register	= 0x16d0,
	.fast_io	= true,
};

static const struct of_device_id mt6315_of_match[] = {
	{
		.compatible = "mediatek,mt6315-regulator",
	}, {
		/* sentinel */
	},
};
MODULE_DEVICE_TABLE(of, mt6315_of_match);

static int mt6315_regulator_probe(struct spmi_device *pdev)
{
	struct device *dev = &pdev->dev;
	struct regmap *regmap;
	struct mt6315_chip *chip;
	struct mt_regulator_init_data *init_data;
	struct regulator_config config = {};
	struct regulator_dev *rdev;
	int i;

	regmap = devm_regmap_init_spmi_ext(pdev, &mt6315_regmap_config);
	if (IS_ERR(regmap))
		return PTR_ERR(regmap);

	chip = devm_kzalloc(dev, sizeof(struct mt6315_chip), GFP_KERNEL);
	if (!chip)
		return -ENOMEM;

	init_data = devm_kzalloc(dev, sizeof(struct mt_regulator_init_data), GFP_KERNEL);
	if (!init_data)
		return -ENOMEM;

	switch (pdev->usid) {
	case MT6315_PP:
		init_data->modeset_mask[MT6315_VBUCK1] = BIT(MT6315_VBUCK1) | BIT(MT6315_VBUCK2) |
							 BIT(MT6315_VBUCK4);
		break;
	case MT6315_SP:
	case MT6315_RP:
		init_data->modeset_mask[MT6315_VBUCK1] = BIT(MT6315_VBUCK1) | BIT(MT6315_VBUCK2);
		break;
	default:
		init_data->modeset_mask[MT6315_VBUCK1] = BIT(MT6315_VBUCK1);
		break;
	}
	for (i = MT6315_VBUCK2; i < MT6315_VBUCK_MAX; i++)
		init_data->modeset_mask[i] = BIT(i);

	chip->dev = dev;
	chip->regmap = regmap;
	dev_set_drvdata(dev, chip);

	config.dev = dev;
	config.regmap = regmap;
	for (i = MT6315_VBUCK1; i < MT6315_VBUCK_MAX; i++) {
		config.driver_data = init_data;
		rdev = devm_regulator_register(dev, &mt6315_regulators[i].desc, &config);
		if (IS_ERR(rdev)) {
			dev_err(dev, "Failed to register %s\n",
				mt6315_regulators[i].desc.name);
			return PTR_ERR(rdev);
		}
	}

	return 0;
}

static void mt6315_regulator_shutdown(struct spmi_device *pdev)
{
	struct mt6315_chip *chip = dev_get_drvdata(&pdev->dev);
	int ret = 0;

	ret |= regmap_write(chip->regmap, MT6315_TOP_TMA_KEY_H, PROTECTION_KEY_H);
	ret |= regmap_write(chip->regmap, MT6315_TOP_TMA_KEY, PROTECTION_KEY);
	ret |= regmap_update_bits(chip->regmap, MT6315_TOP2_ELR7, 1, 1);
	ret |= regmap_write(chip->regmap, MT6315_TOP_TMA_KEY, 0);
	ret |= regmap_write(chip->regmap, MT6315_TOP_TMA_KEY_H, 0);
	if (ret < 0)
		dev_err(&pdev->dev, "[%#x] Failed to enable power off sequence. %d\n",
			   pdev->usid, ret);
}

static struct spmi_driver mt6315_regulator_driver = {
	.driver		= {
		.name	= "mt6315-regulator",
		.probe_type = PROBE_PREFER_ASYNCHRONOUS,
		.of_match_table = mt6315_of_match,
	},
	.probe = mt6315_regulator_probe,
	.shutdown = mt6315_regulator_shutdown,
};

module_spmi_driver(mt6315_regulator_driver);

MODULE_AUTHOR("Hsin-Hsiung Wang <hsin-hsiung.wang@mediatek.com>");
MODULE_DESCRIPTION("Regulator Driver for MediaTek MT6315 PMIC");
MODULE_LICENSE("GPL");