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2024-01-03 2f7c68cb55ecb7331f2381deb497c27155f32faf 
 kernel/sound/soc/codecs/pcm3168a.c
....@@ -1,18 +1,17 @@
1
+// SPDX-License-Identifier: GPL-2.0-only
12 /*
23  * PCM3168A codec driver
34  *
45  * Copyright (C) 2015 Imagination Technologies Ltd.
56  *
67  * Author: Damien Horsley <Damien.Horsley@imgtec.com>
7
- *
8
- * This program is free software; you can redistribute it and/or modify it
9
- * under the terms and conditions of the GNU General Public License,
10
- * version 2, as published by the Free Software Foundation.
118  */
129 
1310 #include <linux/clk.h>
1411 #include <linux/delay.h>
12
+#include <linux/gpio/consumer.h>
1513 #include <linux/module.h>
14
+#include <linux/of_gpio.h>
1615 #include <linux/pm_runtime.h>
1716 #include <linux/regulator/consumer.h>
1817 
....@@ -32,6 +31,8 @@
3231 #define PCM3168A_FMT_RIGHT_J_16		0x3
3332 #define PCM3168A_FMT_DSP_A		0x4
3433 #define PCM3168A_FMT_DSP_B		0x5
34
+#define PCM3168A_FMT_I2S_TDM		0x6
35
+#define PCM3168A_FMT_LEFT_J_TDM		0x7
3536 #define PCM3168A_FMT_DSP_MASK		0x4
3637 
3738 #define PCM3168A_NUM_SUPPLIES 6
....@@ -44,15 +45,27 @@
4445 	"VCCDA2"
4546 };
4647 
48
+#define PCM3168A_DAI_DAC		0
49
+#define PCM3168A_DAI_ADC		1
50
+
51
+/* ADC/DAC side parameters */
52
+struct pcm3168a_io_params {
53
+	bool master_mode;
54
+	unsigned int fmt;
55
+	int tdm_slots;
56
+	u32 tdm_mask;
57
+	int slot_width;
58
+};
59
+
4760 struct pcm3168a_priv {
4861 	struct regulator_bulk_data supplies[PCM3168A_NUM_SUPPLIES];
4962 	struct regmap *regmap;
5063 	struct clk *scki;
51
-	bool adc_master_mode;
52
-	bool dac_master_mode;
64
+	struct gpio_desc *gpio_rst;
5365 	unsigned long sysclk;
54
-	unsigned int adc_fmt;
55
-	unsigned int dac_fmt;
66
+
67
+	struct pcm3168a_io_params io_params[2];
68
+	struct snd_soc_dai_driver dai_drv[2];
5669 };
5770 
5871 static const char *const pcm3168a_roll_off[] = { "Sharp", "Slow" };
....@@ -130,10 +143,6 @@
130143 	SOC_DOUBLE("DAC2 Invert Switch", PCM3168A_DAC_INV, 2, 3, 1, 0),
131144 	SOC_DOUBLE("DAC3 Invert Switch", PCM3168A_DAC_INV, 4, 5, 1, 0),
132145 	SOC_DOUBLE("DAC4 Invert Switch", PCM3168A_DAC_INV, 6, 7, 1, 0),
133
-	SOC_DOUBLE_STS("DAC1 Zero Flag", PCM3168A_DAC_ZERO, 0, 1, 1, 0),
134
-	SOC_DOUBLE_STS("DAC2 Zero Flag", PCM3168A_DAC_ZERO, 2, 3, 1, 0),
135
-	SOC_DOUBLE_STS("DAC3 Zero Flag", PCM3168A_DAC_ZERO, 4, 5, 1, 0),
136
-	SOC_DOUBLE_STS("DAC4 Zero Flag", PCM3168A_DAC_ZERO, 6, 7, 1, 0),
137146 	SOC_ENUM("DAC Volume Control Type", pcm3168a_dac_volume_type),
138147 	SOC_ENUM("DAC Volume Rate Multiplier", pcm3168a_dac_att_mult),
139148 	SOC_ENUM("DAC De-Emphasis", pcm3168a_dac_demp),
....@@ -173,9 +182,6 @@
173182 	SOC_DOUBLE("ADC1 Mute Switch", PCM3168A_ADC_MUTE, 0, 1, 1, 0),
174183 	SOC_DOUBLE("ADC2 Mute Switch", PCM3168A_ADC_MUTE, 2, 3, 1, 0),
175184 	SOC_DOUBLE("ADC3 Mute Switch", PCM3168A_ADC_MUTE, 4, 5, 1, 0),
176
-	SOC_DOUBLE_STS("ADC1 Overflow Flag", PCM3168A_ADC_OV, 0, 1, 1, 0),
177
-	SOC_DOUBLE_STS("ADC2 Overflow Flag", PCM3168A_ADC_OV, 2, 3, 1, 0),
178
-	SOC_DOUBLE_STS("ADC3 Overflow Flag", PCM3168A_ADC_OV, 4, 5, 1, 0),
179185 	SOC_ENUM("ADC Volume Control Type", pcm3168a_adc_volume_type),
180186 	SOC_ENUM("ADC Volume Rate Multiplier", pcm3168a_adc_att_mult),
181187 	SOC_ENUM("ADC Overflow Flag Polarity", pcm3168a_adc_ov_pol),
....@@ -267,7 +273,7 @@
267273 #define PCM3168A_NUM_SCKI_RATIOS_DAC	ARRAY_SIZE(pcm3168a_scki_ratios)
268274 #define PCM3168A_NUM_SCKI_RATIOS_ADC	(ARRAY_SIZE(pcm3168a_scki_ratios) - 2)
269275 
270
-#define PCM1368A_MAX_SYSCLK		36864000
276
+#define PCM3168A_MAX_SYSCLK		36864000
271277 
272278 static int pcm3168a_reset(struct pcm3168a_priv *pcm3168a)
273279 {
....@@ -284,7 +290,7 @@
284290 			PCM3168A_MRST_MASK | PCM3168A_SRST_MASK);
285291 }
286292 
287
-static int pcm3168a_digital_mute(struct snd_soc_dai *dai, int mute)
293
+static int pcm3168a_mute(struct snd_soc_dai *dai, int mute, int direction)
288294 {
289295 	struct snd_soc_component *component = dai->component;
290296 	struct pcm3168a_priv *pcm3168a = snd_soc_component_get_drvdata(component);
....@@ -300,7 +306,14 @@
300306 	struct pcm3168a_priv *pcm3168a = snd_soc_component_get_drvdata(dai->component);
301307 	int ret;
302308 
303
-	if (freq > PCM1368A_MAX_SYSCLK)
309
+	/*
310
+	 * Some sound card sets 0 Hz as reset,
311
+	 * but it is impossible to set. Ignore it here
312
+	 */
313
+	if (freq == 0)
314
+		return 0;
315
+
316
+	if (freq > PCM3168A_MAX_SYSCLK)
304317 		return -EINVAL;
305318 
306319 	ret = clk_set_rate(pcm3168a->scki, freq);
....@@ -312,8 +325,35 @@
312325 	return 0;
313326 }
314327 
315
-static int pcm3168a_set_dai_fmt(struct snd_soc_dai *dai,
316
-			       unsigned int format, bool dac)
328
+static void pcm3168a_update_fixup_pcm_stream(struct snd_soc_dai *dai)
329
+{
330
+	struct snd_soc_component *component = dai->component;
331
+	struct pcm3168a_priv *pcm3168a = snd_soc_component_get_drvdata(component);
332
+	u64 formats = SNDRV_PCM_FMTBIT_S24_3LE | SNDRV_PCM_FMTBIT_S24_LE;
333
+	unsigned int channel_max = dai->id == PCM3168A_DAI_DAC ? 8 : 6;
334
+
335
+	if (pcm3168a->io_params[dai->id].fmt == PCM3168A_FMT_RIGHT_J) {
336
+		/* S16_LE is only supported in RIGHT_J mode */
337
+		formats |= SNDRV_PCM_FMTBIT_S16_LE;
338
+
339
+		/*
340
+		 * If multi DIN/DOUT is not selected, RIGHT_J can only support
341
+		 * two channels (no TDM support)
342
+		 */
343
+		if (pcm3168a->io_params[dai->id].tdm_slots != 2)
344
+			channel_max = 2;
345
+	}
346
+
347
+	if (dai->id == PCM3168A_DAI_DAC) {
348
+		dai->driver->playback.channels_max = channel_max;
349
+		dai->driver->playback.formats = formats;
350
+	} else {
351
+		dai->driver->capture.channels_max = channel_max;
352
+		dai->driver->capture.formats = formats;
353
+	}
354
+}
355
+
356
+static int pcm3168a_set_dai_fmt(struct snd_soc_dai *dai, unsigned int format)
317357 {
318358 	struct snd_soc_component *component = dai->component;
319359 	struct pcm3168a_priv *pcm3168a = snd_soc_component_get_drvdata(component);
....@@ -360,35 +400,59 @@
360400 		return -EINVAL;
361401 	}
362402 
363
-	if (dac) {
403
+	if (dai->id == PCM3168A_DAI_DAC) {
364404 		reg = PCM3168A_DAC_PWR_MST_FMT;
365405 		mask = PCM3168A_DAC_FMT_MASK;
366406 		shift = PCM3168A_DAC_FMT_SHIFT;
367
-		pcm3168a->dac_master_mode = master_mode;
368
-		pcm3168a->dac_fmt = fmt;
369407 	} else {
370408 		reg = PCM3168A_ADC_MST_FMT;
371409 		mask = PCM3168A_ADC_FMTAD_MASK;
372410 		shift = PCM3168A_ADC_FMTAD_SHIFT;
373
-		pcm3168a->adc_master_mode = master_mode;
374
-		pcm3168a->adc_fmt = fmt;
375411 	}
376412 
413
+	pcm3168a->io_params[dai->id].master_mode = master_mode;
414
+	pcm3168a->io_params[dai->id].fmt = fmt;
415
+
377416 	regmap_update_bits(pcm3168a->regmap, reg, mask, fmt << shift);
417
+
418
+	pcm3168a_update_fixup_pcm_stream(dai);
378419 
379420 	return 0;
380421 }
381422 
382
-static int pcm3168a_set_dai_fmt_dac(struct snd_soc_dai *dai,
383
-			       unsigned int format)
423
+static int pcm3168a_set_tdm_slot(struct snd_soc_dai *dai, unsigned int tx_mask,
424
+				 unsigned int rx_mask, int slots,
425
+				 int slot_width)
384426 {
385
-	return pcm3168a_set_dai_fmt(dai, format, true);
386
-}
427
+	struct snd_soc_component *component = dai->component;
428
+	struct pcm3168a_priv *pcm3168a = snd_soc_component_get_drvdata(component);
429
+	struct pcm3168a_io_params *io_params = &pcm3168a->io_params[dai->id];
387430 
388
-static int pcm3168a_set_dai_fmt_adc(struct snd_soc_dai *dai,
389
-			       unsigned int format)
390
-{
391
-	return pcm3168a_set_dai_fmt(dai, format, false);
431
+	if (tx_mask >= (1<<slots) || rx_mask >= (1<<slots)) {
432
+		dev_err(component->dev,
433
+			"Bad tdm mask tx: 0x%08x rx: 0x%08x slots %d\n",
434
+			tx_mask, rx_mask, slots);
435
+		return -EINVAL;
436
+	}
437
+
438
+	if (slot_width &&
439
+	    (slot_width != 16 && slot_width != 24 && slot_width != 32 )) {
440
+		dev_err(component->dev, "Unsupported slot_width %d\n",
441
+			slot_width);
442
+		return -EINVAL;
443
+	}
444
+
445
+	io_params->tdm_slots = slots;
446
+	io_params->slot_width = slot_width;
447
+	/* Ignore the not relevant mask for the DAI/direction */
448
+	if (dai->id == PCM3168A_DAI_DAC)
449
+		io_params->tdm_mask = tx_mask;
450
+	else
451
+		io_params->tdm_mask = rx_mask;
452
+
453
+	pcm3168a_update_fixup_pcm_stream(dai);
454
+
455
+	return 0;
392456 }
393457 
394458 static int pcm3168a_hw_params(struct snd_pcm_substream *substream,
....@@ -397,31 +461,31 @@
397461 {
398462 	struct snd_soc_component *component = dai->component;
399463 	struct pcm3168a_priv *pcm3168a = snd_soc_component_get_drvdata(component);
400
-	bool tx, master_mode;
464
+	struct pcm3168a_io_params *io_params = &pcm3168a->io_params[dai->id];
465
+	bool master_mode;
401466 	u32 val, mask, shift, reg;
402467 	unsigned int rate, fmt, ratio, max_ratio;
403
-	int i, min_frame_size;
468
+	unsigned int tdm_slots;
469
+	int i, slot_width;
404470 
405471 	rate = params_rate(params);
406472 
407473 	ratio = pcm3168a->sysclk / rate;
408474 
409
-	tx = substream->stream == SNDRV_PCM_STREAM_PLAYBACK;
410
-	if (tx) {
475
+	if (dai->id == PCM3168A_DAI_DAC) {
411476 		max_ratio = PCM3168A_NUM_SCKI_RATIOS_DAC;
412477 		reg = PCM3168A_DAC_PWR_MST_FMT;
413478 		mask = PCM3168A_DAC_MSDA_MASK;
414479 		shift = PCM3168A_DAC_MSDA_SHIFT;
415
-		master_mode = pcm3168a->dac_master_mode;
416
-		fmt = pcm3168a->dac_fmt;
417480 	} else {
418481 		max_ratio = PCM3168A_NUM_SCKI_RATIOS_ADC;
419482 		reg = PCM3168A_ADC_MST_FMT;
420483 		mask = PCM3168A_ADC_MSAD_MASK;
421484 		shift = PCM3168A_ADC_MSAD_SHIFT;
422
-		master_mode = pcm3168a->adc_master_mode;
423
-		fmt = pcm3168a->adc_fmt;
424485 	}
486
+
487
+	master_mode = io_params->master_mode;
488
+	fmt = io_params->fmt;
425489 
426490 	for (i = 0; i < max_ratio; i++) {
427491 		if (pcm3168a_scki_ratios[i] == ratio)
....@@ -433,26 +497,60 @@
433497 		return -EINVAL;
434498 	}
435499 
436
-	min_frame_size = params_width(params) * 2;
437
-	switch (min_frame_size) {
438
-	case 32:
500
+	if (io_params->slot_width)
501
+		slot_width = io_params->slot_width;
502
+	else
503
+		slot_width = params_width(params);
504
+
505
+	switch (slot_width) {
506
+	case 16:
439507 		if (master_mode || (fmt != PCM3168A_FMT_RIGHT_J)) {
440
-			dev_err(component->dev, "32-bit frames are supported only for slave mode using right justified\n");
508
+			dev_err(component->dev, "16-bit slots are supported only for slave mode using right justified\n");
441509 			return -EINVAL;
442510 		}
443511 		fmt = PCM3168A_FMT_RIGHT_J_16;
444512 		break;
445
-	case 48:
513
+	case 24:
446514 		if (master_mode || (fmt & PCM3168A_FMT_DSP_MASK)) {
447
-			dev_err(component->dev, "48-bit frames not supported in master mode, or slave mode using DSP\n");
515
+			dev_err(component->dev, "24-bit slots not supported in master mode, or slave mode using DSP\n");
448516 			return -EINVAL;
449517 		}
450518 		break;
451
-	case 64:
519
+	case 32:
452520 		break;
453521 	default:
454
-		dev_err(component->dev, "unsupported frame size: %d\n", min_frame_size);
522
+		dev_err(component->dev, "unsupported frame size: %d\n", slot_width);
455523 		return -EINVAL;
524
+	}
525
+
526
+	if (io_params->tdm_slots)
527
+		tdm_slots = io_params->tdm_slots;
528
+	else
529
+		tdm_slots = params_channels(params);
530
+
531
+	/*
532
+	 * Switch the codec to TDM mode when more than 2 TDM slots are needed
533
+	 * for the stream.
534
+	 * If pcm3168a->tdm_slots is not set or set to more than 2 (8/6 usually)
535
+	 * then DIN1/DOUT1 is used in TDM mode.
536
+	 * If pcm3168a->tdm_slots is set to 2 then DIN1/2/3/4 and DOUT1/2/3 is
537
+	 * used in normal mode, no need to switch to TDM modes.
538
+	 */
539
+	if (tdm_slots > 2) {
540
+		switch (fmt) {
541
+		case PCM3168A_FMT_I2S:
542
+		case PCM3168A_FMT_DSP_A:
543
+			fmt = PCM3168A_FMT_I2S_TDM;
544
+			break;
545
+		case PCM3168A_FMT_LEFT_J:
546
+		case PCM3168A_FMT_DSP_B:
547
+			fmt = PCM3168A_FMT_LEFT_J_TDM;
548
+			break;
549
+		default:
550
+			dev_err(component->dev,
551
+				"TDM is supported under DSP/I2S/Left_J only\n");
552
+			return -EINVAL;
553
+		}
456554 	}
457555 
458556 	if (master_mode)
....@@ -462,7 +560,7 @@
462560 
463561 	regmap_update_bits(pcm3168a->regmap, reg, mask, val);
464562 
465
-	if (tx) {
563
+	if (dai->id == PCM3168A_DAI_DAC) {
466564 		mask = PCM3168A_DAC_FMT_MASK;
467565 		shift = PCM3168A_DAC_FMT_SHIFT;
468566 	} else {
....@@ -475,22 +573,19 @@
475573 	return 0;
476574 }
477575 
478
-static const struct snd_soc_dai_ops pcm3168a_dac_dai_ops = {
479
-	.set_fmt	= pcm3168a_set_dai_fmt_dac,
576
+static const struct snd_soc_dai_ops pcm3168a_dai_ops = {
577
+	.set_fmt	= pcm3168a_set_dai_fmt,
480578 	.set_sysclk	= pcm3168a_set_dai_sysclk,
481579 	.hw_params	= pcm3168a_hw_params,
482
-	.digital_mute	= pcm3168a_digital_mute
483
-};
484
-
485
-static const struct snd_soc_dai_ops pcm3168a_adc_dai_ops = {
486
-	.set_fmt	= pcm3168a_set_dai_fmt_adc,
487
-	.set_sysclk	= pcm3168a_set_dai_sysclk,
488
-	.hw_params	= pcm3168a_hw_params
580
+	.mute_stream	= pcm3168a_mute,
581
+	.set_tdm_slot	= pcm3168a_set_tdm_slot,
582
+	.no_capture_mute = 1,
489583 };
490584 
491585 static struct snd_soc_dai_driver pcm3168a_dais[] = {
492586 	{
493587 		.name = "pcm3168a-dac",
588
+		.id = PCM3168A_DAI_DAC,
494589 		.playback = {
495590 			.stream_name = "Playback",
496591 			.channels_min = 1,
....@@ -498,10 +593,11 @@
498593 			.rates = SNDRV_PCM_RATE_8000_192000,
499594 			.formats = PCM3168A_FORMATS
500595 		},
501
-		.ops = &pcm3168a_dac_dai_ops
596
+		.ops = &pcm3168a_dai_ops
502597 	},
503598 	{
504599 		.name = "pcm3168a-adc",
600
+		.id = PCM3168A_DAI_ADC,
505601 		.capture = {
506602 			.stream_name = "Capture",
507603 			.channels_min = 1,
....@@ -509,7 +605,7 @@
509605 			.rates = SNDRV_PCM_RATE_8000_96000,
510606 			.formats = PCM3168A_FORMATS
511607 		},
512
-		.ops = &pcm3168a_adc_dai_ops
608
+		.ops = &pcm3168a_dai_ops
513609 	},
514610 };
515611 
....@@ -558,6 +654,7 @@
558654 static bool pcm3168a_volatile_register(struct device *dev, unsigned int reg)
559655 {
560656 	switch (reg) {
657
+	case PCM3168A_RST_SMODE:
561658 	case PCM3168A_DAC_ZERO:
562659 	case PCM3168A_ADC_OV:
563660 		return true;
....@@ -617,6 +714,25 @@
617714 
618715 	dev_set_drvdata(dev, pcm3168a);
619716 
717
+	/*
718
+	 * Request the reset (connected to RST pin) gpio line as non exclusive
719
+	 * as the same reset line might be connected to multiple pcm3168a codec
720
+	 *
721
+	 * The RST is low active, we want the GPIO line to be high initially, so
722
+	 * request the initial level to LOW which in practice means DEASSERTED:
723
+	 * The deasserted level of GPIO_ACTIVE_LOW is HIGH.
724
+	 */
725
+	pcm3168a->gpio_rst = devm_gpiod_get_optional(dev, "reset",
726
+						GPIOD_OUT_LOW |
727
+						GPIOD_FLAGS_BIT_NONEXCLUSIVE);
728
+	if (IS_ERR(pcm3168a->gpio_rst)) {
729
+		ret = PTR_ERR(pcm3168a->gpio_rst);
730
+		if (ret != -EPROBE_DEFER )
731
+			dev_err(dev, "failed to acquire RST gpio: %d\n", ret);
732
+
733
+		return ret;
734
+	}
735
+
620736 	pcm3168a->scki = devm_clk_get(dev, "scki");
621737 	if (IS_ERR(pcm3168a->scki)) {
622738 		ret = PTR_ERR(pcm3168a->scki);
....@@ -658,18 +774,28 @@
658774 		goto err_regulator;
659775 	}
660776 
661
-	ret = pcm3168a_reset(pcm3168a);
662
-	if (ret) {
663
-		dev_err(dev, "Failed to reset device: %d\n", ret);
664
-		goto err_regulator;
777
+	if (pcm3168a->gpio_rst) {
778
+		/*
779
+		 * The device is taken out from reset via GPIO line, wait for
780
+		 * 3846 SCKI clock cycles for the internal reset de-assertion
781
+		 */
782
+		msleep(DIV_ROUND_UP(3846 * 1000, pcm3168a->sysclk));
783
+	} else {
784
+		ret = pcm3168a_reset(pcm3168a);
785
+		if (ret) {
786
+			dev_err(dev, "Failed to reset device: %d\n", ret);
787
+			goto err_regulator;
788
+		}
665789 	}
666790 
667791 	pm_runtime_set_active(dev);
668792 	pm_runtime_enable(dev);
669793 	pm_runtime_idle(dev);
670794 
671
-	ret = devm_snd_soc_register_component(dev, &pcm3168a_driver, pcm3168a_dais,
672
-			ARRAY_SIZE(pcm3168a_dais));
795
+	memcpy(pcm3168a->dai_drv, pcm3168a_dais, sizeof(pcm3168a->dai_drv));
796
+	ret = devm_snd_soc_register_component(dev, &pcm3168a_driver,
797
+					      pcm3168a->dai_drv,
798
+					      ARRAY_SIZE(pcm3168a->dai_drv));
673799 	if (ret) {
674800 		dev_err(dev, "failed to register component: %d\n", ret);
675801 		goto err_regulator;
....@@ -698,6 +824,15 @@
698824 
699825 void pcm3168a_remove(struct device *dev)
700826 {
827
+	struct pcm3168a_priv *pcm3168a = dev_get_drvdata(dev);
828
+
829
+	/*
830
+	 * The RST is low active, we want the GPIO line to be low when the
831
+	 * driver is removed, so set level to 1 which in practice means
832
+	 * ASSERTED:
833
+	 * The asserted level of GPIO_ACTIVE_LOW is LOW.
834
+	 */
835
+	gpiod_set_value_cansleep(pcm3168a->gpio_rst, 1);
701836 	pm_runtime_disable(dev);
702837 #ifndef CONFIG_PM
703838 	pcm3168a_disable(dev);