summaryrefslogtreecommitdiff
path: root/drivers/regulator/bd9571mwv-regulator.c
blob: c7ceba56e7dc9011e8c4b80df5ecc81b65f38cb5 (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
362
363
364
365
366
// SPDX-License-Identifier: GPL-2.0
/*
 * ROHM BD9571MWV-M and BD9574MWF-M regulator driver
 *
 * Copyright (C) 2017 Marek Vasut <marek.vasut+renesas@gmail.com>
 *
 * Based on the TPS65086 driver
 *
 * NOTE: VD09 is missing
 */

#include <linux/mfd/rohm-generic.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/platform_device.h>
#include <linux/regulator/driver.h>

#include <linux/mfd/bd9571mwv.h>

struct bd9571mwv_reg {
	struct regmap *regmap;

	/* DDR Backup Power */
	u8 bkup_mode_cnt_keepon;	/* from "rohm,ddr-backup-power" */
	u8 bkup_mode_cnt_saved;
	bool bkup_mode_enabled;

	/* Power switch type */
	bool rstbmode_level;
	bool rstbmode_pulse;
};

enum bd9571mwv_regulators { VD09, VD18, VD25, VD33, DVFS };

#define BD9571MWV_REG(_name, _of, _id, _ops, _vr, _vm, _nv, _min, _step, _lmin)\
	{							\
		.name			= _name,		\
		.of_match		= of_match_ptr(_of),	\
		.regulators_node	= "regulators",		\
		.id			= _id,			\
		.ops			= &_ops,		\
		.n_voltages		= _nv,			\
		.type			= REGULATOR_VOLTAGE,	\
		.owner			= THIS_MODULE,		\
		.vsel_reg		= _vr,			\
		.vsel_mask		= _vm,			\
		.min_uV			= _min,			\
		.uV_step		= _step,		\
		.linear_min_sel		= _lmin,		\
	}

static int bd9571mwv_avs_get_moni_state(struct regulator_dev *rdev)
{
	unsigned int val;
	int ret;

	ret = regmap_read(rdev->regmap, BD9571MWV_AVS_SET_MONI, &val);
	if (ret != 0)
		return ret;

	return val & BD9571MWV_AVS_SET_MONI_MASK;
}

static int bd9571mwv_avs_set_voltage_sel_regmap(struct regulator_dev *rdev,
						unsigned int sel)
{
	int ret;

	ret = bd9571mwv_avs_get_moni_state(rdev);
	if (ret < 0)
		return ret;

	return regmap_write_bits(rdev->regmap, BD9571MWV_AVS_VD09_VID(ret),
				 rdev->desc->vsel_mask, sel);
}

static int bd9571mwv_avs_get_voltage_sel_regmap(struct regulator_dev *rdev)
{
	unsigned int val;
	int ret;

	ret = bd9571mwv_avs_get_moni_state(rdev);
	if (ret < 0)
		return ret;

	ret = regmap_read(rdev->regmap, BD9571MWV_AVS_VD09_VID(ret), &val);
	if (ret != 0)
		return ret;

	val &= rdev->desc->vsel_mask;
	val >>= ffs(rdev->desc->vsel_mask) - 1;

	return val;
}

static int bd9571mwv_reg_set_voltage_sel_regmap(struct regulator_dev *rdev,
						unsigned int sel)
{
	return regmap_write_bits(rdev->regmap, BD9571MWV_DVFS_SETVID,
				 rdev->desc->vsel_mask, sel);
}

/* Operations permitted on AVS voltage regulator */
static const struct regulator_ops avs_ops = {
	.set_voltage_sel	= bd9571mwv_avs_set_voltage_sel_regmap,
	.map_voltage		= regulator_map_voltage_linear,
	.get_voltage_sel	= bd9571mwv_avs_get_voltage_sel_regmap,
	.list_voltage		= regulator_list_voltage_linear,
};

/* Operations permitted on voltage regulators */
static const struct regulator_ops reg_ops = {
	.set_voltage_sel	= bd9571mwv_reg_set_voltage_sel_regmap,
	.map_voltage		= regulator_map_voltage_linear,
	.get_voltage_sel	= regulator_get_voltage_sel_regmap,
	.list_voltage		= regulator_list_voltage_linear,
};

/* Operations permitted on voltage monitors */
static const struct regulator_ops vid_ops = {
	.map_voltage		= regulator_map_voltage_linear,
	.get_voltage_sel	= regulator_get_voltage_sel_regmap,
	.list_voltage		= regulator_list_voltage_linear,
};

static const struct regulator_desc regulators[] = {
	BD9571MWV_REG("VD09", "vd09", VD09, avs_ops, 0, 0x7f,
		      0x6f, 600000, 10000, 0x3c),
	BD9571MWV_REG("VD18", "vd18", VD18, vid_ops, BD9571MWV_VD18_VID, 0xf,
		      16, 1625000, 25000, 0),
	BD9571MWV_REG("VD25", "vd25", VD25, vid_ops, BD9571MWV_VD25_VID, 0xf,
		      16, 2150000, 50000, 0),
	BD9571MWV_REG("VD33", "vd33", VD33, vid_ops, BD9571MWV_VD33_VID, 0xf,
		      11, 2800000, 100000, 0),
	BD9571MWV_REG("DVFS", "dvfs", DVFS, reg_ops,
		      BD9571MWV_DVFS_MONIVDAC, 0x7f,
		      0x6f, 600000, 10000, 0x3c),
};

#ifdef CONFIG_PM_SLEEP
static int bd9571mwv_bkup_mode_read(struct bd9571mwv_reg *bdreg,
				    unsigned int *mode)
{
	int ret;

	ret = regmap_read(bdreg->regmap, BD9571MWV_BKUP_MODE_CNT, mode);
	if (ret) {
		dev_err(regmap_get_device(bdreg->regmap),
			"failed to read backup mode (%d)\n", ret);
		return ret;
	}

	return 0;
}

static int bd9571mwv_bkup_mode_write(struct bd9571mwv_reg *bdreg,
				     unsigned int mode)
{
	int ret;

	ret = regmap_write(bdreg->regmap, BD9571MWV_BKUP_MODE_CNT, mode);
	if (ret) {
		dev_err(regmap_get_device(bdreg->regmap),
			"failed to configure backup mode 0x%x (%d)\n",
			mode, ret);
		return ret;
	}

	return 0;
}

static ssize_t backup_mode_show(struct device *dev,
				struct device_attribute *attr, char *buf)
{
	struct bd9571mwv_reg *bdreg = dev_get_drvdata(dev);

	return sysfs_emit(buf, "%s\n", bdreg->bkup_mode_enabled ? "on" : "off");
}

static ssize_t backup_mode_store(struct device *dev,
				 struct device_attribute *attr,
				 const char *buf, size_t count)
{
	struct bd9571mwv_reg *bdreg = dev_get_drvdata(dev);
	unsigned int mode;
	int ret;

	if (!count)
		return 0;

	ret = kstrtobool(buf, &bdreg->bkup_mode_enabled);
	if (ret)
		return ret;

	if (!bdreg->rstbmode_level)
		return count;

	/*
	 * Configure DDR Backup Mode, to change the role of the accessory power
	 * switch from a power switch to a wake-up switch, or vice versa
	 */
	ret = bd9571mwv_bkup_mode_read(bdreg, &mode);
	if (ret)
		return ret;

	mode &= ~BD9571MWV_BKUP_MODE_CNT_KEEPON_MASK;
	if (bdreg->bkup_mode_enabled)
		mode |= bdreg->bkup_mode_cnt_keepon;

	ret = bd9571mwv_bkup_mode_write(bdreg, mode);
	if (ret)
		return ret;

	return count;
}

static DEVICE_ATTR_RW(backup_mode);

static int bd9571mwv_suspend(struct device *dev)
{
	struct bd9571mwv_reg *bdreg = dev_get_drvdata(dev);
	unsigned int mode;
	int ret;

	if (!bdreg->bkup_mode_enabled)
		return 0;

	/* Save DDR Backup Mode */
	ret = bd9571mwv_bkup_mode_read(bdreg, &mode);
	if (ret)
		return ret;

	bdreg->bkup_mode_cnt_saved = mode;

	if (!bdreg->rstbmode_pulse)
		return 0;

	/* Enable DDR Backup Mode */
	mode &= ~BD9571MWV_BKUP_MODE_CNT_KEEPON_MASK;
	mode |= bdreg->bkup_mode_cnt_keepon;

	if (mode != bdreg->bkup_mode_cnt_saved)
		return bd9571mwv_bkup_mode_write(bdreg, mode);

	return 0;
}

static int bd9571mwv_resume(struct device *dev)
{
	struct bd9571mwv_reg *bdreg = dev_get_drvdata(dev);

	if (!bdreg->bkup_mode_enabled)
		return 0;

	/* Restore DDR Backup Mode */
	return bd9571mwv_bkup_mode_write(bdreg, bdreg->bkup_mode_cnt_saved);
}

static const struct dev_pm_ops bd9571mwv_pm  = {
	SET_SYSTEM_SLEEP_PM_OPS(bd9571mwv_suspend, bd9571mwv_resume)
};

static void bd9571mwv_regulator_remove(struct platform_device *pdev)
{
	device_remove_file(&pdev->dev, &dev_attr_backup_mode);
}
#define DEV_PM_OPS	&bd9571mwv_pm
#else
#define DEV_PM_OPS	NULL
#define bd9571mwv_regulator_remove	NULL
#endif /* CONFIG_PM_SLEEP */

static int bd9571mwv_regulator_probe(struct platform_device *pdev)
{
	struct regulator_config config = { };
	struct bd9571mwv_reg *bdreg;
	struct regulator_dev *rdev;
	unsigned int val;
	int i;
	enum rohm_chip_type chip = platform_get_device_id(pdev)->driver_data;

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

	bdreg->regmap = dev_get_regmap(pdev->dev.parent, NULL);

	platform_set_drvdata(pdev, bdreg);

	config.dev = &pdev->dev;
	config.dev->of_node = pdev->dev.parent->of_node;
	config.driver_data = bdreg;
	config.regmap = bdreg->regmap;

	for (i = 0; i < ARRAY_SIZE(regulators); i++) {
		/* BD9574MWF supports DVFS only */
		if (chip == ROHM_CHIP_TYPE_BD9574 && regulators[i].id != DVFS)
			continue;
		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);
		}
	}

	val = 0;
	of_property_read_u32(config.dev->of_node, "rohm,ddr-backup-power", &val);
	if (val & ~BD9571MWV_BKUP_MODE_CNT_KEEPON_MASK) {
		dev_err(&pdev->dev, "invalid %s mode %u\n",
			"rohm,ddr-backup-power", val);
		return -EINVAL;
	}
	bdreg->bkup_mode_cnt_keepon = val;

	bdreg->rstbmode_level = of_property_read_bool(config.dev->of_node,
						      "rohm,rstbmode-level");
	bdreg->rstbmode_pulse = of_property_read_bool(config.dev->of_node,
						      "rohm,rstbmode-pulse");
	if (bdreg->rstbmode_level && bdreg->rstbmode_pulse) {
		dev_err(&pdev->dev, "only one rohm,rstbmode-* may be specified");
		return -EINVAL;
	}

#ifdef CONFIG_PM_SLEEP
	if (bdreg->bkup_mode_cnt_keepon) {
		int ret;

		/*
		 * Backup mode is enabled by default in pulse mode, but needs
		 * explicit user setup in level mode.
		 */
		bdreg->bkup_mode_enabled = bdreg->rstbmode_pulse;

		ret = device_create_file(&pdev->dev, &dev_attr_backup_mode);
		if (ret)
			return ret;
	}
#endif /* CONFIG_PM_SLEEP */

	return 0;
}

static const struct platform_device_id bd9571mwv_regulator_id_table[] = {
	{ "bd9571mwv-regulator", ROHM_CHIP_TYPE_BD9571 },
	{ "bd9574mwf-regulator", ROHM_CHIP_TYPE_BD9574 },
	{ /* sentinel */ }
};
MODULE_DEVICE_TABLE(platform, bd9571mwv_regulator_id_table);

static struct platform_driver bd9571mwv_regulator_driver = {
	.driver = {
		.name = "bd9571mwv-regulator",
		.probe_type = PROBE_PREFER_ASYNCHRONOUS,
		.pm = DEV_PM_OPS,
	},
	.probe = bd9571mwv_regulator_probe,
	.remove_new = bd9571mwv_regulator_remove,
	.id_table = bd9571mwv_regulator_id_table,
};
module_platform_driver(bd9571mwv_regulator_driver);

MODULE_AUTHOR("Marek Vasut <marek.vasut+renesas@gmail.com>");
MODULE_DESCRIPTION("BD9571MWV Regulator driver");
MODULE_LICENSE("GPL v2");