Free Electrons

Embedded Linux Experts

  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
/*
 * Motorola CPCAP PMIC regulator driver
 *
 * Based on cpcap-regulator.c from Motorola Linux kernel tree
 * Copyright (C) 2009-2011 Motorola, Inc.
 *
 * Rewritten for mainline kernel to use device tree and regmap
 * Copyright (C) 2017 Tony Lindgren <tony@atomide.com>
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License as
 * published by the Free Software Foundation version 2.
 *
 * This program is distributed "as is" WITHOUT ANY WARRANTY of any
 * kind, whether express or implied; without even the implied warranty
 * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 * GNU General Public License for more details.
 */

#include <linux/err.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/of_platform.h>
#include <linux/regmap.h>
#include <linux/regulator/driver.h>
#include <linux/regulator/machine.h>
#include <linux/regulator/of_regulator.h>
#include <linux/mfd/motorola-cpcap.h>

/*
 * Resource assignment register bits. These seem to control the state
 * idle modes adn are used at least for omap4.
 */

/* CPCAP_REG_ASSIGN2 bits - Resource Assignment 2 */
#define CPCAP_BIT_VSDIO_SEL		BIT(15)
#define CPCAP_BIT_VDIG_SEL		BIT(14)
#define CPCAP_BIT_VCAM_SEL		BIT(13)
#define CPCAP_BIT_SW6_SEL		BIT(12)
#define CPCAP_BIT_SW5_SEL		BIT(11)
#define CPCAP_BIT_SW4_SEL		BIT(10)
#define CPCAP_BIT_SW3_SEL		BIT(9)
#define CPCAP_BIT_SW2_SEL		BIT(8)
#define CPCAP_BIT_SW1_SEL		BIT(7)

/* CPCAP_REG_ASSIGN3 bits - Resource Assignment 3 */
#define CPCAP_BIT_VUSBINT2_SEL		BIT(15)
#define CPCAP_BIT_VUSBINT1_SEL		BIT(14)
#define CPCAP_BIT_VVIB_SEL		BIT(13)
#define CPCAP_BIT_VWLAN1_SEL		BIT(12)
#define CPCAP_BIT_VRF1_SEL		BIT(11)
#define CPCAP_BIT_VHVIO_SEL		BIT(10)
#define CPCAP_BIT_VDAC_SEL		BIT(9)
#define CPCAP_BIT_VUSB_SEL		BIT(8)
#define CPCAP_BIT_VSIM_SEL		BIT(7)
#define CPCAP_BIT_VRFREF_SEL		BIT(6)
#define CPCAP_BIT_VPLL_SEL		BIT(5)
#define CPCAP_BIT_VFUSE_SEL		BIT(4)
#define CPCAP_BIT_VCSI_SEL		BIT(3)
#define CPCAP_BIT_SPARE_14_2		BIT(2)
#define CPCAP_BIT_VWLAN2_SEL		BIT(1)
#define CPCAP_BIT_VRF2_SEL		BIT(0)

/* CPCAP_REG_ASSIGN4 bits - Resource Assignment 4 */
#define CPCAP_BIT_VAUDIO_SEL		BIT(0)

/*
 * Enable register bits. At least CPCAP_BIT_AUDIO_LOW_PWR is generic,
 * and not limited to audio regulator. Let's use the Motorola kernel
 * naming for now until we have a better understanding of the other
 * enable register bits. No idea why BIT(3) is not defined.
 */
#define CPCAP_BIT_AUDIO_LOW_PWR		BIT(6)
#define CPCAP_BIT_AUD_LOWPWR_SPEED	BIT(5)
#define CPCAP_BIT_VAUDIOPRISTBY		BIT(4)
#define CPCAP_BIT_VAUDIO_MODE1		BIT(2)
#define CPCAP_BIT_VAUDIO_MODE0		BIT(1)
#define CPCAP_BIT_V_AUDIO_EN		BIT(0)

#define CPCAP_BIT_AUDIO_NORMAL_MODE	0x00

/*
 * Off mode configuration bit. Used currently only by SW5 on omap4. There's
 * the following comment in Motorola Linux kernel tree for it:
 *
 * When set in the regulator mode, the regulator assignment will be changed
 * to secondary when the regulator is disabled. The mode will be set back to
 * primary when the regulator is turned on.
 */
#define CPCAP_REG_OFF_MODE_SEC		BIT(15)

/**
 * SoC specific configuraion for CPCAP regulator. There are at least three
 * different SoCs each with their own parameters: omap3, omap4 and tegra2.
 *
 * The assign_reg and assign_mask seem to allow toggling between primary
 * and secondary mode that at least omap4 uses for off mode.
 */
struct cpcap_regulator {
	struct regulator_desc rdesc;
	const u16 assign_reg;
	const u16 assign_mask;
	const u16 vsel_shift;
};

#define CPCAP_REG(_ID, reg, assignment_reg, assignment_mask, val_tbl,	\
		mode_mask, volt_mask, volt_shft,			\
		mode_val, off_val, volt_trans_time) {			\
	.rdesc = {							\
		.name = #_ID,						\
		.of_match = of_match_ptr(#_ID),				\
		.ops = &cpcap_regulator_ops,				\
		.regulators_node = of_match_ptr("regulators"),		\
		.type = REGULATOR_VOLTAGE,				\
		.id = CPCAP_##_ID,					\
		.owner = THIS_MODULE,					\
		.n_voltages = ARRAY_SIZE(val_tbl),			\
		.volt_table = (val_tbl),				\
		.vsel_reg = (reg),					\
		.vsel_mask = (volt_mask),				\
		.enable_reg = (reg),					\
		.enable_mask = (mode_mask),				\
		.enable_val = (mode_val),				\
		.disable_val = (off_val),				\
		.ramp_delay = (volt_trans_time),			\
	},								\
	.assign_reg = (assignment_reg),					\
	.assign_mask = (assignment_mask),				\
	.vsel_shift = (volt_shft),					\
}

struct cpcap_ddata {
	struct regmap *reg;
	struct device *dev;
	const struct cpcap_regulator *soc;
};

enum cpcap_regulator_id {
	CPCAP_SW1,
	CPCAP_SW2,
	CPCAP_SW3,
	CPCAP_SW4,
	CPCAP_SW5,
	CPCAP_SW6,
	CPCAP_VCAM,
	CPCAP_VCSI,
	CPCAP_VDAC,
	CPCAP_VDIG,
	CPCAP_VFUSE,
	CPCAP_VHVIO,
	CPCAP_VSDIO,
	CPCAP_VPLL,
	CPCAP_VRF1,
	CPCAP_VRF2,
	CPCAP_VRFREF,
	CPCAP_VWLAN1,
	CPCAP_VWLAN2,
	CPCAP_VSIM,
	CPCAP_VSIMCARD,
	CPCAP_VVIB,
	CPCAP_VUSB,
	CPCAP_VAUDIO,
	CPCAP_NR_REGULATORS,
};

/*
 * We need to also configure regulator idle mode for SoC off mode if
 * CPCAP_REG_OFF_MODE_SEC is set.
 */
static int cpcap_regulator_enable(struct regulator_dev *rdev)
{
	struct cpcap_regulator *regulator = rdev_get_drvdata(rdev);
	int error, ignore;

	error = regulator_enable_regmap(rdev);
	if (error)
		return error;

	if (rdev->desc->enable_val & CPCAP_REG_OFF_MODE_SEC) {
		error = regmap_update_bits(rdev->regmap, regulator->assign_reg,
					   regulator->assign_mask,
					   regulator->assign_mask);
		if (error)
			ignore = regulator_disable_regmap(rdev);
	}

	return error;
}

/*
 * We need to also configure regulator idle mode for SoC off mode if
 * CPCAP_REG_OFF_MODE_SEC is set.
 */
static int cpcap_regulator_disable(struct regulator_dev *rdev)
{
	struct cpcap_regulator *regulator = rdev_get_drvdata(rdev);
	int error, ignore;

	if (rdev->desc->enable_val & CPCAP_REG_OFF_MODE_SEC) {
		error = regmap_update_bits(rdev->regmap, regulator->assign_reg,
					   regulator->assign_mask, 0);
		if (error)
			return error;
	}

	error = regulator_disable_regmap(rdev);
	if (error && (rdev->desc->enable_val & CPCAP_REG_OFF_MODE_SEC)) {
		ignore = regmap_update_bits(rdev->regmap, regulator->assign_reg,
					    regulator->assign_mask,
					    regulator->assign_mask);
	}

	return error;
}

static unsigned int cpcap_regulator_get_mode(struct regulator_dev *rdev)
{
	int value;

	regmap_read(rdev->regmap, rdev->desc->enable_reg, &value);

	if (value & CPCAP_BIT_AUDIO_LOW_PWR)
		return REGULATOR_MODE_STANDBY;

	return REGULATOR_MODE_NORMAL;
}

static int cpcap_regulator_set_mode(struct regulator_dev *rdev,
				    unsigned int mode)
{
	int value;

	switch (mode) {
	case REGULATOR_MODE_NORMAL:
		value = CPCAP_BIT_AUDIO_NORMAL_MODE;
		break;
	case REGULATOR_MODE_STANDBY:
		value = CPCAP_BIT_AUDIO_LOW_PWR;
		break;
	default:
		return -EINVAL;
	}

	return regmap_update_bits(rdev->regmap, rdev->desc->enable_reg,
				  CPCAP_BIT_AUDIO_LOW_PWR, value);
}

static struct regulator_ops cpcap_regulator_ops = {
	.enable = cpcap_regulator_enable,
	.disable = cpcap_regulator_disable,
	.is_enabled = regulator_is_enabled_regmap,
	.list_voltage = regulator_list_voltage_table,
	.map_voltage = regulator_map_voltage_iterate,
	.get_voltage_sel = regulator_get_voltage_sel_regmap,
	.set_voltage_sel = regulator_set_voltage_sel_regmap,
	.get_mode = cpcap_regulator_get_mode,
	.set_mode = cpcap_regulator_set_mode,
};

static const unsigned int unknown_val_tbl[] = { 0, };
static const unsigned int sw5_val_tbl[] = { 0, 5050000, };
static const unsigned int vcam_val_tbl[] = { 2600000, 2700000, 2800000,
					     2900000, };
static const unsigned int vcsi_val_tbl[] = { 1200000, 1800000, };
static const unsigned int vdac_val_tbl[] = { 1200000, 1500000, 1800000,
					     2500000,};
static const unsigned int vdig_val_tbl[] = { 1200000, 1350000, 1500000,
					     1875000, };
static const unsigned int vfuse_val_tbl[] = { 1500000, 1600000, 1700000,
					      1800000, 1900000, 2000000,
					      2100000, 2200000, 2300000,
					      2400000, 2500000, 2600000,
					      2700000, 3150000, };
static const unsigned int vhvio_val_tbl[] = { 2775000, };
static const unsigned int vsdio_val_tbl[] = { 1500000, 1600000, 1800000,
					      2600000, 2700000, 2800000,
					      2900000, 3000000, };
static const unsigned int vpll_val_tbl[] = { 1200000, 1300000, 1400000,
					     1800000, };
/* Quirk: 2775000 is before 2500000 for vrf1 regulator */
static const unsigned int vrf1_val_tbl[] = { 2775000, 2500000, };
static const unsigned int vrf2_val_tbl[] = { 0, 2775000, };
static const unsigned int vrfref_val_tbl[] = { 2500000, 2775000, };
static const unsigned int vwlan1_val_tbl[] = { 1800000, 1900000, };
static const unsigned int vwlan2_val_tbl[] = { 2775000, 3000000, 3300000,
					       3300000, };
static const unsigned int vsim_val_tbl[] = { 1800000, 2900000, };
static const unsigned int vsimcard_val_tbl[] = { 1800000, 2900000, };
static const unsigned int vvib_val_tbl[] = { 1300000, 1800000, 2000000,
					     3000000, };
static const unsigned int vusb_val_tbl[] = { 0, 3300000, };
static const unsigned int vaudio_val_tbl[] = { 0, 2775000, };

/**
 * SoC specific configuration for omap4. The data below is comes from Motorola
 * Linux kernel tree. It's basically the values of cpcap_regltr_data,
 * cpcap_regulator_mode_values and cpcap_regulator_off_mode_values, see
 * CPCAP_REG macro above.
 *
 * SW1 to SW4 and SW6 seems to be unused for mapphone. Note that VSIM and
 * VSIMCARD have a shared resource assignment bit.
 */
static struct cpcap_regulator omap4_regulators[] = {
	CPCAP_REG(SW1, CPCAP_REG_S1C1, CPCAP_REG_ASSIGN2,
		  CPCAP_BIT_SW1_SEL, unknown_val_tbl,
		  0, 0, 0, 0, 0, 0),
	CPCAP_REG(SW2, CPCAP_REG_S2C1, CPCAP_REG_ASSIGN2,
		  CPCAP_BIT_SW2_SEL, unknown_val_tbl,
		  0, 0, 0, 0, 0, 0),
	CPCAP_REG(SW3, CPCAP_REG_S3C, CPCAP_REG_ASSIGN2,
		  CPCAP_BIT_SW3_SEL, unknown_val_tbl,
		  0, 0, 0, 0, 0, 0),
	CPCAP_REG(SW4, CPCAP_REG_S4C1, CPCAP_REG_ASSIGN2,
		  CPCAP_BIT_SW4_SEL, unknown_val_tbl,
		  0, 0, 0, 0, 0, 0),
	CPCAP_REG(SW5, CPCAP_REG_S5C, CPCAP_REG_ASSIGN2,
		  CPCAP_BIT_SW5_SEL, sw5_val_tbl,
		  0x28, 0, 0, 0x20 | CPCAP_REG_OFF_MODE_SEC, 0, 0),
	CPCAP_REG(SW6, CPCAP_REG_S6C, CPCAP_REG_ASSIGN2,
		  CPCAP_BIT_SW6_SEL, unknown_val_tbl,
		  0, 0, 0, 0, 0, 0),
	CPCAP_REG(VCAM, CPCAP_REG_VCAMC, CPCAP_REG_ASSIGN2,
		  CPCAP_BIT_VCAM_SEL, vcam_val_tbl,
		  0x87, 0x30, 4, 0x3, 0, 420),
	CPCAP_REG(VCSI, CPCAP_REG_VCSIC, CPCAP_REG_ASSIGN3,
		  CPCAP_BIT_VCSI_SEL, vcsi_val_tbl,
		  0x47, 0x10, 4, 0x43, 0x41, 350),
	CPCAP_REG(VDAC, CPCAP_REG_VDACC, CPCAP_REG_ASSIGN3,
		  CPCAP_BIT_VDAC_SEL, vdac_val_tbl,
		  0x87, 0x30, 4, 0x3, 0, 420),
	CPCAP_REG(VDIG, CPCAP_REG_VDIGC, CPCAP_REG_ASSIGN2,
		  CPCAP_BIT_VDIG_SEL, vdig_val_tbl,
		  0x87, 0x30, 4, 0x82, 0, 420),
	CPCAP_REG(VFUSE, CPCAP_REG_VFUSEC, CPCAP_REG_ASSIGN3,
		  CPCAP_BIT_VFUSE_SEL, vfuse_val_tbl,
		  0x80, 0xf, 0, 0x80, 0, 420),
	CPCAP_REG(VHVIO, CPCAP_REG_VHVIOC, CPCAP_REG_ASSIGN3,
		  CPCAP_BIT_VHVIO_SEL, vhvio_val_tbl,
		  0x17, 0, 0, 0, 0x12, 0),
	CPCAP_REG(VSDIO, CPCAP_REG_VSDIOC, CPCAP_REG_ASSIGN2,
		  CPCAP_BIT_VSDIO_SEL, vsdio_val_tbl,
		  0x87, 0x38, 3, 0x82, 0, 420),
	CPCAP_REG(VPLL, CPCAP_REG_VPLLC, CPCAP_REG_ASSIGN3,
		  CPCAP_BIT_VPLL_SEL, vpll_val_tbl,
		  0x43, 0x18, 3, 0x2, 0, 420),
	CPCAP_REG(VRF1, CPCAP_REG_VRF1C, CPCAP_REG_ASSIGN3,
		  CPCAP_BIT_VRF1_SEL, vrf1_val_tbl,
		  0xac, 0x2, 1, 0x4, 0, 10),
	CPCAP_REG(VRF2, CPCAP_REG_VRF2C, CPCAP_REG_ASSIGN3,
		  CPCAP_BIT_VRF2_SEL, vrf2_val_tbl,
		  0x23, 0x8, 3, 0, 0, 10),
	CPCAP_REG(VRFREF, CPCAP_REG_VRFREFC, CPCAP_REG_ASSIGN3,
		  CPCAP_BIT_VRFREF_SEL, vrfref_val_tbl,
		  0x23, 0x8, 3, 0, 0, 420),
	CPCAP_REG(VWLAN1, CPCAP_REG_VWLAN1C, CPCAP_REG_ASSIGN3,
		  CPCAP_BIT_VWLAN1_SEL, vwlan1_val_tbl,
		  0x47, 0x10, 4, 0, 0, 420),
	CPCAP_REG(VWLAN2, CPCAP_REG_VWLAN2C, CPCAP_REG_ASSIGN3,
		  CPCAP_BIT_VWLAN2_SEL, vwlan2_val_tbl,
		  0x20c, 0xc0, 6, 0x20c, 0, 420),
	CPCAP_REG(VSIM, CPCAP_REG_VSIMC, CPCAP_REG_ASSIGN3,
		  0xffff, vsim_val_tbl,
		  0x23, 0x8, 3, 0x3, 0, 420),
	CPCAP_REG(VSIMCARD, CPCAP_REG_VSIMC, CPCAP_REG_ASSIGN3,
		  0xffff, vsimcard_val_tbl,
		  0x1e80, 0x8, 3, 0x1e00, 0, 420),
	CPCAP_REG(VVIB, CPCAP_REG_VVIBC, CPCAP_REG_ASSIGN3,
		  CPCAP_BIT_VVIB_SEL, vvib_val_tbl,
		  0x1, 0xc, 2, 0x1, 0, 500),
	CPCAP_REG(VUSB, CPCAP_REG_VUSBC, CPCAP_REG_ASSIGN3,
		  CPCAP_BIT_VUSB_SEL, vusb_val_tbl,
		  0x11c, 0x40, 6, 0xc, 0, 0),
	CPCAP_REG(VAUDIO, CPCAP_REG_VAUDIOC, CPCAP_REG_ASSIGN4,
		  CPCAP_BIT_VAUDIO_SEL, vaudio_val_tbl,
		  0x16, 0x1, 0, 0x4, 0, 0),
	{ /* sentinel */ },
};

static const struct of_device_id cpcap_regulator_id_table[] = {
	{
		.compatible = "motorola,cpcap-regulator",
	},
	{
		.compatible = "motorola,mapphone-cpcap-regulator",
		.data = omap4_regulators,
	},
	{},
};
MODULE_DEVICE_TABLE(of, cpcap_regulator_id_table);

static int cpcap_regulator_probe(struct platform_device *pdev)
{
	struct cpcap_ddata *ddata;
	const struct of_device_id *match;
	struct regulator_config config;
	struct regulator_init_data init_data;
	int i;

	match = of_match_device(of_match_ptr(cpcap_regulator_id_table),
				&pdev->dev);
	if (!match)
		return -EINVAL;

	if (!match->data) {
		dev_err(&pdev->dev, "no configuration data found\n");

		return -ENODEV;
	}

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

	ddata->reg = dev_get_regmap(pdev->dev.parent, NULL);
	if (!ddata->reg)
		return -ENODEV;

	ddata->dev = &pdev->dev;
	ddata->soc = match->data;
	platform_set_drvdata(pdev, ddata);

	memset(&config, 0, sizeof(config));
	memset(&init_data, 0, sizeof(init_data));
	config.dev = &pdev->dev;
	config.regmap = ddata->reg;
	config.init_data = &init_data;

	for (i = 0; i < CPCAP_NR_REGULATORS; i++) {
		const struct cpcap_regulator *regulator = &ddata->soc[i];
		struct regulator_dev *rdev;

		if (!regulator->rdesc.name)
			break;

		if (regulator->rdesc.volt_table == unknown_val_tbl)
			continue;

		config.driver_data = (void *)regulator;
		rdev = devm_regulator_register(&pdev->dev,
					       &regulator->rdesc,
					       &config);
		if (IS_ERR(rdev)) {
			dev_err(&pdev->dev, "failed to register regulator %s\n",
				regulator->rdesc.name);

			return PTR_ERR(rdev);
		}
	}

	return 0;
}

static struct platform_driver cpcap_regulator_driver = {
	.probe		= cpcap_regulator_probe,
	.driver		= {
		.name	= "cpcap-regulator",
		.of_match_table = of_match_ptr(cpcap_regulator_id_table),
	},
};

module_platform_driver(cpcap_regulator_driver);

MODULE_ALIAS("platform:cpcap-regulator");
MODULE_AUTHOR("Tony Lindgren <tony@atomide.com>");
MODULE_DESCRIPTION("CPCAP regulator driver");
MODULE_LICENSE("GPL v2");