summaryrefslogtreecommitdiffstats
path: root/drivers/regulator/hi6421v600-regulator.c
blob: 845bc3b4026dd2b4d4142102e26eb3cc3ca1c799 (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
// SPDX-License-Identifier: GPL-2.0
//
// Device driver for regulators in Hisi IC
//
// Copyright (c) 2013 Linaro Ltd.
// Copyright (c) 2011 HiSilicon Ltd.
// Copyright (c) 2020-2021 Huawei Technologies Co., Ltd
//
// Guodong Xu <guodong.xu@linaro.org>

#include <linux/delay.h>
#include <linux/mfd/hi6421-spmi-pmic.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/regmap.h>
#include <linux/regulator/driver.h>
#include <linux/spmi.h>

struct hi6421_spmi_reg_priv {
	/* Serialize regulator enable logic */
	struct mutex enable_mutex;
};

struct hi6421_spmi_reg_info {
	struct regulator_desc	desc;
	u8			eco_mode_mask;
	u32			eco_uA;
};

static const unsigned int ldo3_voltages[] = {
	1500000, 1550000, 1600000, 1650000,
	1700000, 1725000, 1750000, 1775000,
	1800000, 1825000, 1850000, 1875000,
	1900000, 1925000, 1950000, 2000000
};

static const unsigned int ldo4_voltages[] = {
	1725000, 1750000, 1775000, 1800000,
	1825000, 1850000, 1875000, 1900000
};

static const unsigned int ldo9_voltages[] = {
	1750000, 1800000, 1825000, 2800000,
	2850000, 2950000, 3000000, 3300000
};

static const unsigned int ldo15_voltages[] = {
	1800000, 1850000, 2400000, 2600000,
	2700000, 2850000, 2950000, 3000000
};

static const unsigned int ldo17_voltages[] = {
	2500000, 2600000, 2700000, 2800000,
	3000000, 3100000, 3200000, 3300000
};

static const unsigned int ldo34_voltages[] = {
	2600000, 2700000, 2800000, 2900000,
	3000000, 3100000, 3200000, 3300000
};

/**
 * HI6421V600_LDO() - specify a LDO power line
 * @_id: LDO id name string
 * @vtable: voltage table
 * @ereg: enable register
 * @emask: enable mask
 * @vreg: voltage select register
 * @odelay: off/on delay time in uS
 * @etime: enable time in uS
 * @ecomask: eco mode mask
 * @ecoamp: eco mode load uppler limit in uA
 */
#define HI6421V600_LDO(_id, vtable, ereg, emask, vreg,			       \
		       odelay, etime, ecomask, ecoamp)			       \
	[HI6421V600_##_id] = {						       \
		.desc = {						       \
			.name		= #_id,				       \
			.of_match        = of_match_ptr(#_id),		       \
			.regulators_node = of_match_ptr("regulators"),	       \
			.ops		= &hi6421_spmi_ldo_rops,	       \
			.type		= REGULATOR_VOLTAGE,		       \
			.id		= HI6421V600_##_id,		       \
			.owner		= THIS_MODULE,			       \
			.volt_table	= vtable,			       \
			.n_voltages	= ARRAY_SIZE(vtable),		       \
			.vsel_mask	= ARRAY_SIZE(vtable) - 1,	       \
			.vsel_reg	= vreg,				       \
			.enable_reg	= ereg,				       \
			.enable_mask	= emask,			       \
			.enable_time	= etime,			       \
			.ramp_delay	= etime,			       \
			.off_on_delay	= odelay,			       \
		},							       \
		.eco_mode_mask		= ecomask,			       \
		.eco_uA			= ecoamp,			       \
	}

static int hi6421_spmi_regulator_enable(struct regulator_dev *rdev)
{
	struct hi6421_spmi_reg_priv *priv = rdev_get_drvdata(rdev);
	int ret;

	/* cannot enable more than one regulator at one time */
	mutex_lock(&priv->enable_mutex);

	ret = regmap_update_bits(rdev->regmap, rdev->desc->enable_reg,
				 rdev->desc->enable_mask,
				 rdev->desc->enable_mask);

	/* Avoid powering up multiple devices at the same time */
	usleep_range(rdev->desc->off_on_delay, rdev->desc->off_on_delay + 60);

	mutex_unlock(&priv->enable_mutex);

	return ret;
}

static unsigned int hi6421_spmi_regulator_get_mode(struct regulator_dev *rdev)
{
	struct hi6421_spmi_reg_info *sreg;
	unsigned int reg_val;

	sreg = container_of(rdev->desc, struct hi6421_spmi_reg_info, desc);
	regmap_read(rdev->regmap, rdev->desc->enable_reg, &reg_val);

	if (reg_val & sreg->eco_mode_mask)
		return REGULATOR_MODE_IDLE;

	return REGULATOR_MODE_NORMAL;
}

static int hi6421_spmi_regulator_set_mode(struct regulator_dev *rdev,
					  unsigned int mode)
{
	struct hi6421_spmi_reg_info *sreg;
	unsigned int val;

	sreg = container_of(rdev->desc, struct hi6421_spmi_reg_info, desc);
	switch (mode) {
	case REGULATOR_MODE_NORMAL:
		val = 0;
		break;
	case REGULATOR_MODE_IDLE:
		if (!sreg->eco_mode_mask)
			return -EINVAL;

		val = sreg->eco_mode_mask;
		break;
	default:
		return -EINVAL;
	}

	return regmap_update_bits(rdev->regmap, rdev->desc->enable_reg,
				  sreg->eco_mode_mask, val);
}

static unsigned int
hi6421_spmi_regulator_get_optimum_mode(struct regulator_dev *rdev,
				       int input_uV, int output_uV,
				       int load_uA)
{
	struct hi6421_spmi_reg_info *sreg;

	sreg = container_of(rdev->desc, struct hi6421_spmi_reg_info, desc);

	if (!sreg->eco_uA || ((unsigned int)load_uA > sreg->eco_uA))
		return REGULATOR_MODE_NORMAL;

	return REGULATOR_MODE_IDLE;
}

static const struct regulator_ops hi6421_spmi_ldo_rops = {
	.is_enabled = regulator_is_enabled_regmap,
	.enable = hi6421_spmi_regulator_enable,
	.disable = regulator_disable_regmap,
	.list_voltage = regulator_list_voltage_table,
	.map_voltage = regulator_map_voltage_ascend,
	.get_voltage_sel = regulator_get_voltage_sel_regmap,
	.set_voltage_sel = regulator_set_voltage_sel_regmap,
	.get_mode = hi6421_spmi_regulator_get_mode,
	.set_mode = hi6421_spmi_regulator_set_mode,
	.get_optimum_mode = hi6421_spmi_regulator_get_optimum_mode,
};

/* HI6421v600 regulators with known registers */
enum hi6421_spmi_regulator_id {
	HI6421V600_LDO3,
	HI6421V600_LDO4,
	HI6421V600_LDO9,
	HI6421V600_LDO15,
	HI6421V600_LDO16,
	HI6421V600_LDO17,
	HI6421V600_LDO33,
	HI6421V600_LDO34,
};

static struct hi6421_spmi_reg_info regulator_info[] = {
	HI6421V600_LDO(LDO3, ldo3_voltages,
		       0x16, 0x01, 0x51,
		       20000, 120,
		       0, 0),
	HI6421V600_LDO(LDO4, ldo4_voltages,
		       0x17, 0x01, 0x52,
		       20000, 120,
		       0x10, 10000),
	HI6421V600_LDO(LDO9, ldo9_voltages,
		       0x1c, 0x01, 0x57,
		       20000, 360,
		       0x10, 10000),
	HI6421V600_LDO(LDO15, ldo15_voltages,
		       0x21, 0x01, 0x5c,
		       20000, 360,
		       0x10, 10000),
	HI6421V600_LDO(LDO16, ldo15_voltages,
		       0x22, 0x01, 0x5d,
		       20000, 360,
		       0x10, 10000),
	HI6421V600_LDO(LDO17, ldo17_voltages,
		       0x23, 0x01, 0x5e,
		       20000, 120,
		       0x10, 10000),
	HI6421V600_LDO(LDO33, ldo17_voltages,
		       0x32, 0x01, 0x6d,
		       20000, 120,
		       0, 0),
	HI6421V600_LDO(LDO34, ldo34_voltages,
		       0x33, 0x01, 0x6e,
		       20000, 120,
		       0, 0),
};

static int hi6421_spmi_regulator_probe(struct platform_device *pdev)
{
	struct device *pmic_dev = pdev->dev.parent;
	struct regulator_config config = { };
	struct hi6421_spmi_reg_priv *priv;
	struct hi6421_spmi_reg_info *info;
	struct device *dev = &pdev->dev;
	struct hi6421_spmi_pmic *pmic;
	struct regulator_dev *rdev;
	int i;

	/*
	 * This driver is meant to be called by hi6421-spmi-core,
	 * which should first set drvdata. If this doesn't happen, hit
	 * a warn on and return.
	 */
	pmic = dev_get_drvdata(pmic_dev);
	if (WARN_ON(!pmic))
		return -ENODEV;

	priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
	if (!priv)
		return -ENOMEM;

	mutex_init(&priv->enable_mutex);

	for (i = 0; i < ARRAY_SIZE(regulator_info); i++) {
		info = &regulator_info[i];

		config.dev = pdev->dev.parent;
		config.driver_data = priv;
		config.regmap = pmic->regmap;

		rdev = devm_regulator_register(dev, &info->desc, &config);
		if (IS_ERR(rdev)) {
			dev_err(dev, "failed to register %s\n",
				info->desc.name);
			return PTR_ERR(rdev);
		}
	}

	return 0;
}

static const struct platform_device_id hi6421_spmi_regulator_table[] = {
	{ .name = "hi6421v600-regulator" },
	{},
};
MODULE_DEVICE_TABLE(platform, hi6421_spmi_regulator_table);

static struct platform_driver hi6421_spmi_regulator_driver = {
	.id_table = hi6421_spmi_regulator_table,
	.driver = {
		.name = "hi6421v600-regulator",
	},
	.probe	= hi6421_spmi_regulator_probe,
};
module_platform_driver(hi6421_spmi_regulator_driver);

MODULE_DESCRIPTION("Hi6421v600 SPMI regulator driver");
MODULE_LICENSE("GPL v2");