summaryrefslogtreecommitdiffstats
path: root/drivers/regulator/fan53555.c
blob: 00c83492f774125ce2ce3e6a75143fefc065d00c (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
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
// SPDX-License-Identifier: GPL-2.0
//
// FAN53555 Fairchild Digitally Programmable TinyBuck Regulator Driver.
//
// Supported Part Numbers:
// FAN53555UC00X/01X/03X/04X/05X
//
// Copyright (c) 2012 Marvell Technology Ltd.
// Yunfan Zhang <yfzhang@marvell.com>

#include <linux/module.h>
#include <linux/param.h>
#include <linux/err.h>
#include <linux/platform_device.h>
#include <linux/regulator/driver.h>
#include <linux/regulator/machine.h>
#include <linux/regulator/of_regulator.h>
#include <linux/of_device.h>
#include <linux/i2c.h>
#include <linux/slab.h>
#include <linux/regmap.h>
#include <linux/regulator/fan53555.h>

/* Voltage setting */
#define FAN53555_VSEL0		0x00
#define FAN53555_VSEL1		0x01
/* Control register */
#define FAN53555_CONTROL	0x02
/* IC Type */
#define FAN53555_ID1		0x03
/* IC mask version */
#define FAN53555_ID2		0x04
/* Monitor register */
#define FAN53555_MONITOR	0x05

/* VSEL bit definitions */
#define VSEL_BUCK_EN	(1 << 7)
#define VSEL_MODE		(1 << 6)
/* Chip ID and Verison */
#define DIE_ID		0x0F	/* ID1 */
#define DIE_REV		0x0F	/* ID2 */
/* Control bit definitions */
#define CTL_OUTPUT_DISCHG	(1 << 7)
#define CTL_SLEW_MASK		(0x7 << 4)
#define CTL_SLEW_SHIFT		4
#define CTL_RESET			(1 << 2)
#define CTL_MODE_VSEL0_MODE	BIT(0)
#define CTL_MODE_VSEL1_MODE	BIT(1)

#define FAN53555_NVOLTAGES	64	/* Numbers of voltages */
#define FAN53526_NVOLTAGES	128

enum fan53555_vendor {
	FAN53526_VENDOR_FAIRCHILD = 0,
	FAN53555_VENDOR_FAIRCHILD,
	FAN53555_VENDOR_SILERGY,
};

enum {
	FAN53526_CHIP_ID_01 = 1,
};

enum {
	FAN53526_CHIP_REV_08 = 8,
};

/* IC Type */
enum {
	FAN53555_CHIP_ID_00 = 0,
	FAN53555_CHIP_ID_01,
	FAN53555_CHIP_ID_02,
	FAN53555_CHIP_ID_03,
	FAN53555_CHIP_ID_04,
	FAN53555_CHIP_ID_05,
	FAN53555_CHIP_ID_08 = 8,
};

/* IC mask revision */
enum {
	FAN53555_CHIP_REV_00 = 0x3,
	FAN53555_CHIP_REV_13 = 0xf,
};

enum {
	SILERGY_SYR82X = 8,
	SILERGY_SYR83X = 9,
};

struct fan53555_device_info {
	enum fan53555_vendor vendor;
	struct device *dev;
	struct regulator_desc desc;
	struct regulator_init_data *regulator;
	/* IC Type and Rev */
	int chip_id;
	int chip_rev;
	/* Voltage setting register */
	unsigned int vol_reg;
	unsigned int sleep_reg;
	/* Voltage range and step(linear) */
	unsigned int vsel_min;
	unsigned int vsel_step;
	unsigned int vsel_count;
	/* Mode */
	unsigned int mode_reg;
	unsigned int mode_mask;
	/* Sleep voltage cache */
	unsigned int sleep_vol_cache;
};

static int fan53555_set_suspend_voltage(struct regulator_dev *rdev, int uV)
{
	struct fan53555_device_info *di = rdev_get_drvdata(rdev);
	int ret;

	if (di->sleep_vol_cache == uV)
		return 0;
	ret = regulator_map_voltage_linear(rdev, uV, uV);
	if (ret < 0)
		return ret;
	ret = regmap_update_bits(rdev->regmap, di->sleep_reg,
				 di->desc.vsel_mask, ret);
	if (ret < 0)
		return ret;
	/* Cache the sleep voltage setting.
	 * Might not be the real voltage which is rounded */
	di->sleep_vol_cache = uV;

	return 0;
}

static int fan53555_set_suspend_enable(struct regulator_dev *rdev)
{
	struct fan53555_device_info *di = rdev_get_drvdata(rdev);

	return regmap_update_bits(rdev->regmap, di->sleep_reg,
				  VSEL_BUCK_EN, VSEL_BUCK_EN);
}

static int fan53555_set_suspend_disable(struct regulator_dev *rdev)
{
	struct fan53555_device_info *di = rdev_get_drvdata(rdev);

	return regmap_update_bits(rdev->regmap, di->sleep_reg,
				  VSEL_BUCK_EN, 0);
}

static int fan53555_set_mode(struct regulator_dev *rdev, unsigned int mode)
{
	struct fan53555_device_info *di = rdev_get_drvdata(rdev);

	switch (mode) {
	case REGULATOR_MODE_FAST:
		regmap_update_bits(rdev->regmap, di->mode_reg,
				   di->mode_mask, di->mode_mask);
		break;
	case REGULATOR_MODE_NORMAL:
		regmap_update_bits(rdev->regmap, di->vol_reg, di->mode_mask, 0);
		break;
	default:
		return -EINVAL;
	}
	return 0;
}

static unsigned int fan53555_get_mode(struct regulator_dev *rdev)
{
	struct fan53555_device_info *di = rdev_get_drvdata(rdev);
	unsigned int val;
	int ret = 0;

	ret = regmap_read(rdev->regmap, di->mode_reg, &val);
	if (ret < 0)
		return ret;
	if (val & di->mode_mask)
		return REGULATOR_MODE_FAST;
	else
		return REGULATOR_MODE_NORMAL;
}

static const int slew_rates[] = {
	64000,
	32000,
	16000,
	 8000,
	 4000,
	 2000,
	 1000,
	  500,
};

static int fan53555_set_ramp(struct regulator_dev *rdev, int ramp)
{
	struct fan53555_device_info *di = rdev_get_drvdata(rdev);
	int regval = -1, i;

	for (i = 0; i < ARRAY_SIZE(slew_rates); i++) {
		if (ramp <= slew_rates[i])
			regval = i;
		else
			break;
	}

	if (regval < 0) {
		dev_err(di->dev, "unsupported ramp value %d\n", ramp);
		return -EINVAL;
	}

	return regmap_update_bits(rdev->regmap, FAN53555_CONTROL,
				  CTL_SLEW_MASK, regval << CTL_SLEW_SHIFT);
}

static const struct regulator_ops fan53555_regulator_ops = {
	.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,
	.map_voltage = regulator_map_voltage_linear,
	.list_voltage = regulator_list_voltage_linear,
	.set_suspend_voltage = fan53555_set_suspend_voltage,
	.enable = regulator_enable_regmap,
	.disable = regulator_disable_regmap,
	.is_enabled = regulator_is_enabled_regmap,
	.set_mode = fan53555_set_mode,
	.get_mode = fan53555_get_mode,
	.set_ramp_delay = fan53555_set_ramp,
	.set_suspend_enable = fan53555_set_suspend_enable,
	.set_suspend_disable = fan53555_set_suspend_disable,
};

static int fan53526_voltages_setup_fairchild(struct fan53555_device_info *di)
{
	/* Init voltage range and step */
	switch (di->chip_id) {
	case FAN53526_CHIP_ID_01:
		switch (di->chip_rev) {
		case FAN53526_CHIP_REV_08:
			di->vsel_min = 600000;
			di->vsel_step = 6250;
			break;
		default:
			dev_err(di->dev,
				"Chip ID %d with rev %d not supported!\n",
				di->chip_id, di->chip_rev);
			return -EINVAL;
		}
		break;
	default:
		dev_err(di->dev,
			"Chip ID %d not supported!\n", di->chip_id);
		return -EINVAL;
	}

	di->vsel_count = FAN53526_NVOLTAGES;

	return 0;
}

static int fan53555_voltages_setup_fairchild(struct fan53555_device_info *di)
{
	/* Init voltage range and step */
	switch (di->chip_id) {
	case FAN53555_CHIP_ID_00:
		switch (di->chip_rev) {
		case FAN53555_CHIP_REV_00:
			di->vsel_min = 600000;
			di->vsel_step = 10000;
			break;
		case FAN53555_CHIP_REV_13:
			di->vsel_min = 800000;
			di->vsel_step = 10000;
			break;
		default:
			dev_err(di->dev,
				"Chip ID %d with rev %d not supported!\n",
				di->chip_id, di->chip_rev);
			return -EINVAL;
		}
		break;
	case FAN53555_CHIP_ID_01:
	case FAN53555_CHIP_ID_03:
	case FAN53555_CHIP_ID_05:
	case FAN53555_CHIP_ID_08:
		di->vsel_min = 600000;
		di->vsel_step = 10000;
		break;
	case FAN53555_CHIP_ID_04:
		di->vsel_min = 603000;
		di->vsel_step = 12826;
		break;
	default:
		dev_err(di->dev,
			"Chip ID %d not supported!\n", di->chip_id);
		return -EINVAL;
	}

	di->vsel_count = FAN53555_NVOLTAGES;

	return 0;
}

static int fan53555_voltages_setup_silergy(struct fan53555_device_info *di)
{
	/* Init voltage range and step */
	switch (di->chip_id) {
	case SILERGY_SYR82X:
	case SILERGY_SYR83X:
		di->vsel_min = 712500;
		di->vsel_step = 12500;
		break;
	default:
		dev_err(di->dev,
			"Chip ID %d not supported!\n", di->chip_id);
		return -EINVAL;
	}

	di->vsel_count = FAN53555_NVOLTAGES;

	return 0;
}

/* For 00,01,03,05 options:
 * VOUT = 0.60V + NSELx * 10mV, from 0.60 to 1.23V.
 * For 04 option:
 * VOUT = 0.603V + NSELx * 12.826mV, from 0.603 to 1.411V.
 * */
static int fan53555_device_setup(struct fan53555_device_info *di,
				struct fan53555_platform_data *pdata)
{
	int ret = 0;

	/* Setup voltage control register */
	switch (pdata->sleep_vsel_id) {
	case FAN53555_VSEL_ID_0:
		di->sleep_reg = FAN53555_VSEL0;
		di->vol_reg = FAN53555_VSEL1;
		break;
	case FAN53555_VSEL_ID_1:
		di->sleep_reg = FAN53555_VSEL1;
		di->vol_reg = FAN53555_VSEL0;
		break;
	default:
		dev_err(di->dev, "Invalid VSEL ID!\n");
		return -EINVAL;
	}

	/* Setup mode control register */
	switch (di->vendor) {
	case FAN53526_VENDOR_FAIRCHILD:
		di->mode_reg = FAN53555_CONTROL;

		switch (pdata->sleep_vsel_id) {
		case FAN53555_VSEL_ID_0:
			di->mode_mask = CTL_MODE_VSEL1_MODE;
			break;
		case FAN53555_VSEL_ID_1:
			di->mode_mask = CTL_MODE_VSEL0_MODE;
			break;
		}
		break;
	case FAN53555_VENDOR_FAIRCHILD:
	case FAN53555_VENDOR_SILERGY:
		di->mode_reg = di->vol_reg;
		di->mode_mask = VSEL_MODE;
		break;
	default:
		dev_err(di->dev, "vendor %d not supported!\n", di->vendor);
		return -EINVAL;
	}

	/* Setup voltage range */
	switch (di->vendor) {
	case FAN53526_VENDOR_FAIRCHILD:
		ret = fan53526_voltages_setup_fairchild(di);
		break;
	case FAN53555_VENDOR_FAIRCHILD:
		ret = fan53555_voltages_setup_fairchild(di);
		break;
	case FAN53555_VENDOR_SILERGY:
		ret = fan53555_voltages_setup_silergy(di);
		break;
	default:
		dev_err(di->dev, "vendor %d not supported!\n", di->vendor);
		return -EINVAL;
	}

	return ret;
}

static int fan53555_regulator_register(struct fan53555_device_info *di,
			struct regulator_config *config)
{
	struct regulator_desc *rdesc = &di->desc;
	struct regulator_dev *rdev;

	rdesc->name = "fan53555-reg";
	rdesc->supply_name = "vin";
	rdesc->ops = &fan53555_regulator_ops;
	rdesc->type = REGULATOR_VOLTAGE;
	rdesc->n_voltages = di->vsel_count;
	rdesc->enable_reg = di->vol_reg;
	rdesc->enable_mask = VSEL_BUCK_EN;
	rdesc->min_uV = di->vsel_min;
	rdesc->uV_step = di->vsel_step;
	rdesc->vsel_reg = di->vol_reg;
	rdesc->vsel_mask = di->vsel_count - 1;
	rdesc->owner = THIS_MODULE;

	rdev = devm_regulator_register(di->dev, &di->desc, config);
	return PTR_ERR_OR_ZERO(rdev);
}

static const struct regmap_config fan53555_regmap_config = {
	.reg_bits = 8,
	.val_bits = 8,
};

static struct fan53555_platform_data *fan53555_parse_dt(struct device *dev,
					      struct device_node *np,
					      const struct regulator_desc *desc)
{
	struct fan53555_platform_data *pdata;
	int ret;
	u32 tmp;

	pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
	if (!pdata)
		return NULL;

	pdata->regulator = of_get_regulator_init_data(dev, np, desc);

	ret = of_property_read_u32(np, "fcs,suspend-voltage-selector",
				   &tmp);
	if (!ret)
		pdata->sleep_vsel_id = tmp;

	return pdata;
}

static const struct of_device_id fan53555_dt_ids[] = {
	{
		.compatible = "fcs,fan53526",
		.data = (void *)FAN53526_VENDOR_FAIRCHILD,
	}, {
		.compatible = "fcs,fan53555",
		.data = (void *)FAN53555_VENDOR_FAIRCHILD
	}, {
		.compatible = "silergy,syr827",
		.data = (void *)FAN53555_VENDOR_SILERGY,
	}, {
		.compatible = "silergy,syr828",
		.data = (void *)FAN53555_VENDOR_SILERGY,
	},
	{ }
};
MODULE_DEVICE_TABLE(of, fan53555_dt_ids);

static int fan53555_regulator_probe(struct i2c_client *client,
				const struct i2c_device_id *id)
{
	struct device_node *np = client->dev.of_node;
	struct fan53555_device_info *di;
	struct fan53555_platform_data *pdata;
	struct regulator_config config = { };
	struct regmap *regmap;
	unsigned int val;
	int ret;

	di = devm_kzalloc(&client->dev, sizeof(struct fan53555_device_info),
					GFP_KERNEL);
	if (!di)
		return -ENOMEM;

	pdata = dev_get_platdata(&client->dev);
	if (!pdata)
		pdata = fan53555_parse_dt(&client->dev, np, &di->desc);

	if (!pdata || !pdata->regulator) {
		dev_err(&client->dev, "Platform data not found!\n");
		return -ENODEV;
	}

	di->regulator = pdata->regulator;
	if (client->dev.of_node) {
		di->vendor =
			(unsigned long)of_device_get_match_data(&client->dev);
	} else {
		/* if no ramp constraint set, get the pdata ramp_delay */
		if (!di->regulator->constraints.ramp_delay) {
			if (pdata->slew_rate >= ARRAY_SIZE(slew_rates)) {
				dev_err(&client->dev, "Invalid slew_rate\n");
				return -EINVAL;
			}

			di->regulator->constraints.ramp_delay
					= slew_rates[pdata->slew_rate];
		}

		di->vendor = id->driver_data;
	}

	regmap = devm_regmap_init_i2c(client, &fan53555_regmap_config);
	if (IS_ERR(regmap)) {
		dev_err(&client->dev, "Failed to allocate regmap!\n");
		return PTR_ERR(regmap);
	}
	di->dev = &client->dev;
	i2c_set_clientdata(client, di);
	/* Get chip ID */
	ret = regmap_read(regmap, FAN53555_ID1, &val);
	if (ret < 0) {
		dev_err(&client->dev, "Failed to get chip ID!\n");
		return ret;
	}
	di->chip_id = val & DIE_ID;
	/* Get chip revision */
	ret = regmap_read(regmap, FAN53555_ID2, &val);
	if (ret < 0) {
		dev_err(&client->dev, "Failed to get chip Rev!\n");
		return ret;
	}
	di->chip_rev = val & DIE_REV;
	dev_info(&client->dev, "FAN53555 Option[%d] Rev[%d] Detected!\n",
				di->chip_id, di->chip_rev);
	/* Device init */
	ret = fan53555_device_setup(di, pdata);
	if (ret < 0) {
		dev_err(&client->dev, "Failed to setup device!\n");
		return ret;
	}
	/* Register regulator */
	config.dev = di->dev;
	config.init_data = di->regulator;
	config.regmap = regmap;
	config.driver_data = di;
	config.of_node = np;

	ret = fan53555_regulator_register(di, &config);
	if (ret < 0)
		dev_err(&client->dev, "Failed to register regulator!\n");
	return ret;

}

static const struct i2c_device_id fan53555_id[] = {
	{
		.name = "fan53526",
		.driver_data = FAN53526_VENDOR_FAIRCHILD
	}, {
		.name = "fan53555",
		.driver_data = FAN53555_VENDOR_FAIRCHILD
	}, {
		.name = "syr827",
		.driver_data = FAN53555_VENDOR_SILERGY
	}, {
		.name = "syr828",
		.driver_data = FAN53555_VENDOR_SILERGY
	},
	{ },
};
MODULE_DEVICE_TABLE(i2c, fan53555_id);

static struct i2c_driver fan53555_regulator_driver = {
	.driver = {
		.name = "fan53555-regulator",
		.of_match_table = of_match_ptr(fan53555_dt_ids),
	},
	.probe = fan53555_regulator_probe,
	.id_table = fan53555_id,
};

module_i2c_driver(fan53555_regulator_driver);

MODULE_AUTHOR("Yunfan Zhang <yfzhang@marvell.com>");
MODULE_DESCRIPTION("FAN53555 regulator driver");
MODULE_LICENSE("GPL v2");