aboutsummaryrefslogtreecommitdiff
path: root/drivers/mfd/twl6040-core.c
blob: dda86293dc9fc0a3f8baaf678591d764824cfe14 (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
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
/*
 * MFD driver for TWL6040 audio device
 *
 * Authors:	Misael Lopez Cruz <misael.lopez@ti.com>
 *		Jorge Eduardo Candelaria <jorge.candelaria@ti.com>
 *		Peter Ujfalusi <peter.ujfalusi@ti.com>
 *
 * Copyright:	(C) 2011 Texas Instruments, Inc.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
 * 02110-1301 USA
 *
 */

#include <linux/module.h>
#include <linux/types.h>
#include <linux/slab.h>
#include <linux/kernel.h>
#include <linux/platform_device.h>
#include <linux/gpio.h>
#include <linux/delay.h>
#include <linux/i2c/twl.h>
#include <linux/mfd/core.h>
#include <linux/mfd/twl6040.h>

#define VIBRACTRL_MEMBER(reg) ((reg == TWL6040_REG_VIBCTLL) ? 0 : 1)

int twl6040_reg_read(struct twl6040 *twl6040, unsigned int reg)
{
	int ret;
	u8 val = 0;

	mutex_lock(&twl6040->io_mutex);
	/* Vibra control registers from cache */
	if (unlikely(reg == TWL6040_REG_VIBCTLL ||
		     reg == TWL6040_REG_VIBCTLR)) {
		val = twl6040->vibra_ctrl_cache[VIBRACTRL_MEMBER(reg)];
	} else {
		ret = twl_i2c_read_u8(TWL_MODULE_AUDIO_VOICE, &val, reg);
		if (ret < 0) {
			mutex_unlock(&twl6040->io_mutex);
			return ret;
		}
	}
	mutex_unlock(&twl6040->io_mutex);

	return val;
}
EXPORT_SYMBOL(twl6040_reg_read);

int twl6040_reg_write(struct twl6040 *twl6040, unsigned int reg, u8 val)
{
	int ret;

	mutex_lock(&twl6040->io_mutex);
	ret = twl_i2c_write_u8(TWL_MODULE_AUDIO_VOICE, val, reg);
	/* Cache the vibra control registers */
	if (reg == TWL6040_REG_VIBCTLL || reg == TWL6040_REG_VIBCTLR)
		twl6040->vibra_ctrl_cache[VIBRACTRL_MEMBER(reg)] = val;
	mutex_unlock(&twl6040->io_mutex);

	return ret;
}
EXPORT_SYMBOL(twl6040_reg_write);

int twl6040_set_bits(struct twl6040 *twl6040, unsigned int reg, u8 mask)
{
	int ret;
	u8 val;

	mutex_lock(&twl6040->io_mutex);
	ret = twl_i2c_read_u8(TWL_MODULE_AUDIO_VOICE, &val, reg);
	if (ret)
		goto out;

	val |= mask;
	ret = twl_i2c_write_u8(TWL_MODULE_AUDIO_VOICE, val, reg);
out:
	mutex_unlock(&twl6040->io_mutex);
	return ret;
}
EXPORT_SYMBOL(twl6040_set_bits);

int twl6040_clear_bits(struct twl6040 *twl6040, unsigned int reg, u8 mask)
{
	int ret;
	u8 val;

	mutex_lock(&twl6040->io_mutex);
	ret = twl_i2c_read_u8(TWL_MODULE_AUDIO_VOICE, &val, reg);
	if (ret)
		goto out;

	val &= ~mask;
	ret = twl_i2c_write_u8(TWL_MODULE_AUDIO_VOICE, val, reg);
out:
	mutex_unlock(&twl6040->io_mutex);
	return ret;
}
EXPORT_SYMBOL(twl6040_clear_bits);

/* twl6040 codec manual power-up sequence */
static int twl6040_power_up(struct twl6040 *twl6040)
{
	u8 ldoctl, ncpctl, lppllctl;
	int ret;

	/* enable high-side LDO, reference system and internal oscillator */
	ldoctl = TWL6040_HSLDOENA | TWL6040_REFENA | TWL6040_OSCENA;
	ret = twl6040_reg_write(twl6040, TWL6040_REG_LDOCTL, ldoctl);
	if (ret)
		return ret;
	usleep_range(10000, 10500);

	/* enable negative charge pump */
	ncpctl = TWL6040_NCPENA;
	ret = twl6040_reg_write(twl6040, TWL6040_REG_NCPCTL, ncpctl);
	if (ret)
		goto ncp_err;
	usleep_range(1000, 1500);

	/* enable low-side LDO */
	ldoctl |= TWL6040_LSLDOENA;
	ret = twl6040_reg_write(twl6040, TWL6040_REG_LDOCTL, ldoctl);
	if (ret)
		goto lsldo_err;
	usleep_range(1000, 1500);

	/* enable low-power PLL */
	lppllctl = TWL6040_LPLLENA;
	ret = twl6040_reg_write(twl6040, TWL6040_REG_LPPLLCTL, lppllctl);
	if (ret)
		goto lppll_err;
	usleep_range(5000, 5500);

	/* disable internal oscillator */
	ldoctl &= ~TWL6040_OSCENA;
	ret = twl6040_reg_write(twl6040, TWL6040_REG_LDOCTL, ldoctl);
	if (ret)
		goto osc_err;

	return 0;

osc_err:
	lppllctl &= ~TWL6040_LPLLENA;
	twl6040_reg_write(twl6040, TWL6040_REG_LPPLLCTL, lppllctl);
lppll_err:
	ldoctl &= ~TWL6040_LSLDOENA;
	twl6040_reg_write(twl6040, TWL6040_REG_LDOCTL, ldoctl);
lsldo_err:
	ncpctl &= ~TWL6040_NCPENA;
	twl6040_reg_write(twl6040, TWL6040_REG_NCPCTL, ncpctl);
ncp_err:
	ldoctl &= ~(TWL6040_HSLDOENA | TWL6040_REFENA | TWL6040_OSCENA);
	twl6040_reg_write(twl6040, TWL6040_REG_LDOCTL, ldoctl);

	return ret;
}

/* twl6040 manual power-down sequence */
static void twl6040_power_down(struct twl6040 *twl6040)
{
	u8 ncpctl, ldoctl, lppllctl;

	ncpctl = twl6040_reg_read(twl6040, TWL6040_REG_NCPCTL);
	ldoctl = twl6040_reg_read(twl6040, TWL6040_REG_LDOCTL);
	lppllctl = twl6040_reg_read(twl6040, TWL6040_REG_LPPLLCTL);

	/* enable internal oscillator */
	ldoctl |= TWL6040_OSCENA;
	twl6040_reg_write(twl6040, TWL6040_REG_LDOCTL, ldoctl);
	usleep_range(1000, 1500);

	/* disable low-power PLL */
	lppllctl &= ~TWL6040_LPLLENA;
	twl6040_reg_write(twl6040, TWL6040_REG_LPPLLCTL, lppllctl);

	/* disable low-side LDO */
	ldoctl &= ~TWL6040_LSLDOENA;
	twl6040_reg_write(twl6040, TWL6040_REG_LDOCTL, ldoctl);

	/* disable negative charge pump */
	ncpctl &= ~TWL6040_NCPENA;
	twl6040_reg_write(twl6040, TWL6040_REG_NCPCTL, ncpctl);

	/* disable high-side LDO, reference system and internal oscillator */
	ldoctl &= ~(TWL6040_HSLDOENA | TWL6040_REFENA | TWL6040_OSCENA);
	twl6040_reg_write(twl6040, TWL6040_REG_LDOCTL, ldoctl);
}

static irqreturn_t twl6040_naudint_handler(int irq, void *data)
{
	struct twl6040 *twl6040 = data;
	u8 intid, status;

	intid = twl6040_reg_read(twl6040, TWL6040_REG_INTID);

	if (intid & TWL6040_READYINT)
		complete(&twl6040->ready);

	if (intid & TWL6040_THINT) {
		status = twl6040_reg_read(twl6040, TWL6040_REG_STATUS);
		if (status & TWL6040_TSHUTDET) {
			dev_warn(twl6040->dev,
				 "Thermal shutdown, powering-off");
			twl6040_power(twl6040, 0);
		} else {
			dev_warn(twl6040->dev,
				 "Leaving thermal shutdown, powering-on");
			twl6040_power(twl6040, 1);
		}
	}

	return IRQ_HANDLED;
}

static int twl6040_power_up_completion(struct twl6040 *twl6040,
				       int naudint)
{
	int time_left;
	u8 intid;

	time_left = wait_for_completion_timeout(&twl6040->ready,
						msecs_to_jiffies(144));
	if (!time_left) {
		intid = twl6040_reg_read(twl6040, TWL6040_REG_INTID);
		if (!(intid & TWL6040_READYINT)) {
			dev_err(twl6040->dev,
				"timeout waiting for READYINT\n");
			return -ETIMEDOUT;
		}
	}

	return 0;
}

int twl6040_power(struct twl6040 *twl6040, int on)
{
	int audpwron = twl6040->audpwron;
	int naudint = twl6040->irq;
	int ret = 0;

	mutex_lock(&twl6040->mutex);

	if (on) {
		/* already powered-up */
		if (twl6040->power_count++)
			goto out;

		if (gpio_is_valid(audpwron)) {
			/* use AUDPWRON line */
			gpio_set_value(audpwron, 1);
			/* wait for power-up completion */
			ret = twl6040_power_up_completion(twl6040, naudint);
			if (ret) {
				dev_err(twl6040->dev,
					"automatic power-down failed\n");
				twl6040->power_count = 0;
				goto out;
			}
		} else {
			/* use manual power-up sequence */
			ret = twl6040_power_up(twl6040);
			if (ret) {
				dev_err(twl6040->dev,
					"manual power-up failed\n");
				twl6040->power_count = 0;
				goto out;
			}
		}
		/* Default PLL configuration after power up */
		twl6040->pll = TWL6040_SYSCLK_SEL_LPPLL;
		twl6040->sysclk = 19200000;
	} else {
		/* already powered-down */
		if (!twl6040->power_count) {
			dev_err(twl6040->dev,
				"device is already powered-off\n");
			ret = -EPERM;
			goto out;
		}

		if (--twl6040->power_count)
			goto out;

		if (gpio_is_valid(audpwron)) {
			/* use AUDPWRON line */
			gpio_set_value(audpwron, 0);

			/* power-down sequence latency */
			usleep_range(500, 700);
		} else {
			/* use manual power-down sequence */
			twl6040_power_down(twl6040);
		}
		twl6040->sysclk = 0;
	}

out:
	mutex_unlock(&twl6040->mutex);
	return ret;
}
EXPORT_SYMBOL(twl6040_power);

int twl6040_set_pll(struct twl6040 *twl6040, int pll_id,
		    unsigned int freq_in, unsigned int freq_out)
{
	u8 hppllctl, lppllctl;
	int ret = 0;

	mutex_lock(&twl6040->mutex);

	hppllctl = twl6040_reg_read(twl6040, TWL6040_REG_HPPLLCTL);
	lppllctl = twl6040_reg_read(twl6040, TWL6040_REG_LPPLLCTL);

	switch (pll_id) {
	case TWL6040_SYSCLK_SEL_LPPLL:
		/* low-power PLL divider */
		switch (freq_out) {
		case 17640000:
			lppllctl |= TWL6040_LPLLFIN;
			break;
		case 19200000:
			lppllctl &= ~TWL6040_LPLLFIN;
			break;
		default:
			dev_err(twl6040->dev,
				"freq_out %d not supported\n", freq_out);
			ret = -EINVAL;
			goto pll_out;
		}
		twl6040_reg_write(twl6040, TWL6040_REG_LPPLLCTL, lppllctl);

		switch (freq_in) {
		case 32768:
			lppllctl |= TWL6040_LPLLENA;
			twl6040_reg_write(twl6040, TWL6040_REG_LPPLLCTL,
					  lppllctl);
			mdelay(5);
			lppllctl &= ~TWL6040_HPLLSEL;
			twl6040_reg_write(twl6040, TWL6040_REG_LPPLLCTL,
					  lppllctl);
			hppllctl &= ~TWL6040_HPLLENA;
			twl6040_reg_write(twl6040, TWL6040_REG_HPPLLCTL,
					  hppllctl);
			break;
		default:
			dev_err(twl6040->dev,
				"freq_in %d not supported\n", freq_in);
			ret = -EINVAL;
			goto pll_out;
		}
		break;
	case TWL6040_SYSCLK_SEL_HPPLL:
		/* high-performance PLL can provide only 19.2 MHz */
		if (freq_out != 19200000) {
			dev_err(twl6040->dev,
				"freq_out %d not supported\n", freq_out);
			ret = -EINVAL;
			goto pll_out;
		}

		hppllctl &= ~TWL6040_MCLK_MSK;

		switch (freq_in) {
		case 12000000:
			/* PLL enabled, active mode */
			hppllctl |= TWL6040_MCLK_12000KHZ |
				    TWL6040_HPLLENA;
			break;
		case 19200000:
			/*
			 * PLL disabled
			 * (enable PLL if MCLK jitter quality
			 *  doesn't meet specification)
			 */
			hppllctl |= TWL6040_MCLK_19200KHZ;
			break;
		case 26000000:
			/* PLL enabled, active mode */
			hppllctl |= TWL6040_MCLK_26000KHZ |
				    TWL6040_HPLLENA;
			break;
		case 38400000:
			/* PLL enabled, active mode */
			hppllctl |= TWL6040_MCLK_38400KHZ |
				    TWL6040_HPLLENA;
			break;
		default:
			dev_err(twl6040->dev,
				"freq_in %d not supported\n", freq_in);
			ret = -EINVAL;
			goto pll_out;
		}

		/* enable clock slicer to ensure input waveform is square */
		hppllctl |= TWL6040_HPLLSQRENA;

		twl6040_reg_write(twl6040, TWL6040_REG_HPPLLCTL, hppllctl);
		usleep_range(500, 700);
		lppllctl |= TWL6040_HPLLSEL;
		twl6040_reg_write(twl6040, TWL6040_REG_LPPLLCTL, lppllctl);
		lppllctl &= ~TWL6040_LPLLENA;
		twl6040_reg_write(twl6040, TWL6040_REG_LPPLLCTL, lppllctl);
		break;
	default:
		dev_err(twl6040->dev, "unknown pll id %d\n", pll_id);
		ret = -EINVAL;
		goto pll_out;
	}

	twl6040->sysclk = freq_out;
	twl6040->pll = pll_id;

pll_out:
	mutex_unlock(&twl6040->mutex);
	return ret;
}
EXPORT_SYMBOL(twl6040_set_pll);

int twl6040_get_pll(struct twl6040 *twl6040)
{
	if (twl6040->power_count)
		return twl6040->pll;
	else
		return -ENODEV;
}
EXPORT_SYMBOL(twl6040_get_pll);

unsigned int twl6040_get_sysclk(struct twl6040 *twl6040)
{
	return twl6040->sysclk;
}
EXPORT_SYMBOL(twl6040_get_sysclk);

/* Get the combined status of the vibra control register */
int twl6040_get_vibralr_status(struct twl6040 *twl6040)
{
	u8 status;

	status = twl6040->vibra_ctrl_cache[0] | twl6040->vibra_ctrl_cache[1];
	status &= (TWL6040_VIBENA | TWL6040_VIBSEL);

	return status;
}
EXPORT_SYMBOL(twl6040_get_vibralr_status);

static struct resource twl6040_vibra_rsrc[] = {
	{
		.flags = IORESOURCE_IRQ,
	},
};

static struct resource twl6040_codec_rsrc[] = {
	{
		.flags = IORESOURCE_IRQ,
	},
};

static int __devinit twl6040_probe(struct platform_device *pdev)
{
	struct twl4030_audio_data *pdata = pdev->dev.platform_data;
	struct twl6040 *twl6040;
	struct mfd_cell *cell = NULL;
	int ret, children = 0;

	if (!pdata) {
		dev_err(&pdev->dev, "Platform data is missing\n");
		return -EINVAL;
	}

	/* In order to operate correctly we need valid interrupt config */
	if (!pdata->naudint_irq || !pdata->irq_base) {
		dev_err(&pdev->dev, "Invalid IRQ configuration\n");
		return -EINVAL;
	}

	twl6040 = kzalloc(sizeof(struct twl6040), GFP_KERNEL);
	if (!twl6040)
		return -ENOMEM;

	platform_set_drvdata(pdev, twl6040);

	twl6040->dev = &pdev->dev;
	twl6040->irq = pdata->naudint_irq;
	twl6040->irq_base = pdata->irq_base;

	mutex_init(&twl6040->mutex);
	mutex_init(&twl6040->io_mutex);
	init_completion(&twl6040->ready);

	twl6040->rev = twl6040_reg_read(twl6040, TWL6040_REG_ASICREV);

	/* ERRATA: Automatic power-up is not possible in ES1.0 */
	if (twl6040_get_revid(twl6040) > TWL6040_REV_ES1_0)
		twl6040->audpwron = pdata->audpwron_gpio;
	else
		twl6040->audpwron = -EINVAL;

	if (gpio_is_valid(twl6040->audpwron)) {
		ret = gpio_request_one(twl6040->audpwron, GPIOF_OUT_INIT_LOW,
				       "audpwron");
		if (ret)
			goto gpio1_err;
	}

	/* codec interrupt */
	ret = twl6040_irq_init(twl6040);
	if (ret)
		goto gpio2_err;

	ret = request_threaded_irq(twl6040->irq_base + TWL6040_IRQ_READY,
				   NULL, twl6040_naudint_handler, 0,
				   "twl6040_irq_ready", twl6040);
	if (ret) {
		dev_err(twl6040->dev, "READY IRQ request failed: %d\n",
			ret);
		goto irq_err;
	}

	/* dual-access registers controlled by I2C only */
	twl6040_set_bits(twl6040, TWL6040_REG_ACCCTL, TWL6040_I2CSEL);

	if (pdata->codec) {
		int irq = twl6040->irq_base + TWL6040_IRQ_PLUG;

		cell = &twl6040->cells[children];
		cell->name = "twl6040-codec";
		twl6040_codec_rsrc[0].start = irq;
		twl6040_codec_rsrc[0].end = irq;
		cell->resources = twl6040_codec_rsrc;
		cell->num_resources = ARRAY_SIZE(twl6040_codec_rsrc);
		cell->platform_data = pdata->codec;
		cell->pdata_size = sizeof(*pdata->codec);
		children++;
	}

	if (pdata->vibra) {
		int irq = twl6040->irq_base + TWL6040_IRQ_VIB;

		cell = &twl6040->cells[children];
		cell->name = "twl6040-vibra";
		twl6040_vibra_rsrc[0].start = irq;
		twl6040_vibra_rsrc[0].end = irq;
		cell->resources = twl6040_vibra_rsrc;
		cell->num_resources = ARRAY_SIZE(twl6040_vibra_rsrc);

		cell->platform_data = pdata->vibra;
		cell->pdata_size = sizeof(*pdata->vibra);
		children++;
	}

	if (children) {
		ret = mfd_add_devices(&pdev->dev, pdev->id, twl6040->cells,
				      children, NULL, 0);
		if (ret)
			goto mfd_err;
	} else {
		dev_err(&pdev->dev, "No platform data found for children\n");
		ret = -ENODEV;
		goto mfd_err;
	}

	return 0;

mfd_err:
	free_irq(twl6040->irq_base + TWL6040_IRQ_READY, twl6040);
irq_err:
	twl6040_irq_exit(twl6040);
gpio2_err:
	if (gpio_is_valid(twl6040->audpwron))
		gpio_free(twl6040->audpwron);
gpio1_err:
	platform_set_drvdata(pdev, NULL);
	kfree(twl6040);
	return ret;
}

static int __devexit twl6040_remove(struct platform_device *pdev)
{
	struct twl6040 *twl6040 = platform_get_drvdata(pdev);

	if (twl6040->power_count)
		twl6040_power(twl6040, 0);

	if (gpio_is_valid(twl6040->audpwron))
		gpio_free(twl6040->audpwron);

	free_irq(twl6040->irq_base + TWL6040_IRQ_READY, twl6040);
	twl6040_irq_exit(twl6040);

	mfd_remove_devices(&pdev->dev);
	platform_set_drvdata(pdev, NULL);
	kfree(twl6040);

	return 0;
}

static struct platform_driver twl6040_driver = {
	.probe		= twl6040_probe,
	.remove		= __devexit_p(twl6040_remove),
	.driver		= {
		.owner	= THIS_MODULE,
		.name	= "twl6040",
	},
};

module_platform_driver(twl6040_driver);

MODULE_DESCRIPTION("TWL6040 MFD");
MODULE_AUTHOR("Misael Lopez Cruz <misael.lopez@ti.com>");
MODULE_AUTHOR("Jorge Eduardo Candelaria <jorge.candelaria@ti.com>");
MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:twl6040");