1 // SPDX-License-Identifier: GPL-2.0-only
29  * ---- I2S Controller Register map ----
44  * ---- Control Register (Write-only) ----
48 #define ATMEL_I2SC_CR_CKEN	BIT(2)	/* Clock Enable */
49 #define ATMEL_I2SC_CR_CKDIS	BIT(3)	/* Clock Disable */
55  * ---- Mode Register (Read/Write) ----
101 /* Audio Clock to I2SC Master Clock ratio */
106 /* Master Clock to fs ratio */
111 /* Master Clock mode */
113 /* 0: No master clock generated (selected clock drives I2SCK pin) */
115 /* 1: master clock generated (internally generated clock drives I2SMCK pin) */
124  * ---- Status Registers ----
143  * ---- Interrupt Enable/Disable/Mask Registers ----
211 	regmap_read(dev->regmap, ATMEL_I2SC_SR, &sr);  in atmel_i2s_interrupt()
212 	regmap_read(dev->regmap, ATMEL_I2SC_IMR, &imr);  in atmel_i2s_interrupt()
224 				dev_err(dev->dev,  in atmel_i2s_interrupt()
228 		regmap_write(dev->regmap, ATMEL_I2SC_SCR, mask);  in atmel_i2s_interrupt()
238 				dev_err(dev->dev,  in atmel_i2s_interrupt()
242 		regmap_write(dev->regmap, ATMEL_I2SC_SCR, mask);  in atmel_i2s_interrupt()
263 	dev->fmt = fmt;  in atmel_i2s_set_dai_fmt()
271 	bool is_playback = (substream->stream == SNDRV_PCM_STREAM_PLAYBACK);  in atmel_i2s_prepare()
275 		regmap_read(dev->regmap, ATMEL_I2SC_SR, &sr);  in atmel_i2s_prepare()
282 			dev_dbg(dev->dev, "RXRDY is set\n");  in atmel_i2s_prepare()
283 			regmap_read(dev->regmap, ATMEL_I2SC_RHR, &rhr);  in atmel_i2s_prepare()
294 	if (!dev->gclk) {  in atmel_i2s_get_gck_param()
295 		dev_err(dev->dev, "cannot generate the I2S Master Clock\n");  in atmel_i2s_get_gck_param()
296 		return -EINVAL;  in atmel_i2s_get_gck_param()
300 	 * Find the best possible settings to generate the I2S Master Clock  in atmel_i2s_get_gck_param()
303 	dev->gck_param = NULL;  in atmel_i2s_get_gck_param()
307 		int val = abs(fs - gck_param->fs);  in atmel_i2s_get_gck_param()
311 			dev->gck_param = gck_param;  in atmel_i2s_get_gck_param()
323 	bool is_playback = (substream->stream == SNDRV_PCM_STREAM_PLAYBACK);  in atmel_i2s_hw_params()
327 	switch (dev->fmt & SND_SOC_DAIFMT_FORMAT_MASK) {  in atmel_i2s_hw_params()
333 		dev_err(dev->dev, "unsupported bus format\n");  in atmel_i2s_hw_params()
334 		return -EINVAL;  in atmel_i2s_hw_params()
337 	switch (dev->fmt & SND_SOC_DAIFMT_MASTER_MASK) {  in atmel_i2s_hw_params()
339 		/* codec is slave, so cpu is master */  in atmel_i2s_hw_params()
347 		/* codec is master, so cpu is slave */  in atmel_i2s_hw_params()
349 		dev->gck_param = NULL;  in atmel_i2s_hw_params()
353 		dev_err(dev->dev, "unsupported master/slave mode\n");  in atmel_i2s_hw_params()
354 		return -EINVAL;  in atmel_i2s_hw_params()
367 		dev_err(dev->dev, "unsupported number of audio channels\n");  in atmel_i2s_hw_params()
368 		return -EINVAL;  in atmel_i2s_hw_params()
401 		dev_err(dev->dev, "unsupported size/endianness for audio samples\n");  in atmel_i2s_hw_params()
402 		return -EINVAL;  in atmel_i2s_hw_params()
405 	return regmap_write(dev->regmap, ATMEL_I2SC_MR, mr);  in atmel_i2s_hw_params()
421 		/* Disable the I2S Master Clock generator. */  in atmel_i2s_switch_mck_generator()
422 		ret = regmap_write(dev->regmap, ATMEL_I2SC_CR,  in atmel_i2s_switch_mck_generator()
427 		/* Reset the I2S Master Clock generator settings. */  in atmel_i2s_switch_mck_generator()
428 		ret = regmap_update_bits(dev->regmap, ATMEL_I2SC_MR,  in atmel_i2s_switch_mck_generator()
433 		/* Disable/unprepare the PMC generated clock. */  in atmel_i2s_switch_mck_generator()
434 		clk_disable_unprepare(dev->gclk);  in atmel_i2s_switch_mck_generator()
439 	if (!dev->gck_param)  in atmel_i2s_switch_mck_generator()
440 		return -EINVAL;  in atmel_i2s_switch_mck_generator()
442 	gclk_rate = dev->gck_param->mck * (dev->gck_param->imckdiv + 1);  in atmel_i2s_switch_mck_generator()
444 	ret = clk_set_rate(dev->gclk, gclk_rate);  in atmel_i2s_switch_mck_generator()
448 	ret = clk_prepare_enable(dev->gclk);  in atmel_i2s_switch_mck_generator()
452 	/* Update the Mode Register to generate the I2S Master Clock. */  in atmel_i2s_switch_mck_generator()
453 	mr |= ATMEL_I2SC_MR_IMCKDIV(dev->gck_param->imckdiv);  in atmel_i2s_switch_mck_generator()
454 	mr |= ATMEL_I2SC_MR_IMCKFS(dev->gck_param->imckfs);  in atmel_i2s_switch_mck_generator()
456 	ret = regmap_update_bits(dev->regmap, ATMEL_I2SC_MR, mr_mask, mr);  in atmel_i2s_switch_mck_generator()
460 	/* Finally enable the I2S Master Clock generator. */  in atmel_i2s_switch_mck_generator()
461 	return regmap_write(dev->regmap, ATMEL_I2SC_CR,  in atmel_i2s_switch_mck_generator()
469 	bool is_playback = (substream->stream == SNDRV_PCM_STREAM_PLAYBACK);  in atmel_i2s_trigger()
488 		return -EINVAL;  in atmel_i2s_trigger()
491 	/* Read the Mode Register to retrieve the master/slave state. */  in atmel_i2s_trigger()
492 	err = regmap_read(dev->regmap, ATMEL_I2SC_MR, &mr);  in atmel_i2s_trigger()
497 	/* If master starts, enable the audio clock. */  in atmel_i2s_trigger()
503 	err = regmap_write(dev->regmap, ATMEL_I2SC_CR, cr);  in atmel_i2s_trigger()
507 	/* If master stops, disable the audio clock. */  in atmel_i2s_trigger()
525 	snd_soc_dai_init_dma_data(dai, &dev->playback, &dev->capture);  in atmel_i2s_dai_probe()
548 	.name	= "atmel-i2s",
557 	if (!dev->gclk)  in atmel_i2s_sama5d2_mck_init()
561 	muxclk = devm_clk_get(dev->dev, "muxclk");  in atmel_i2s_sama5d2_mck_init()
564 		if (err == -EPROBE_DEFER)  in atmel_i2s_sama5d2_mck_init()
565 			return -EPROBE_DEFER;  in atmel_i2s_sama5d2_mck_init()
566 		dev_warn(dev->dev,  in atmel_i2s_sama5d2_mck_init()
567 			 "failed to get the I2S clock control: %d\n", err);  in atmel_i2s_sama5d2_mck_init()
571 	return clk_set_parent(muxclk, dev->gclk);  in atmel_i2s_sama5d2_mck_init()
580 		.compatible = "atmel,sama5d2-i2s",
591 	struct device_node *np = pdev->dev.of_node;  in atmel_i2s_probe()
598 	int err = -ENXIO;  in atmel_i2s_probe()
603 	dev = devm_kzalloc(&pdev->dev, sizeof(*dev), GFP_KERNEL);  in atmel_i2s_probe()
605 		return -ENOMEM;  in atmel_i2s_probe()
610 		dev->caps = match->data;  in atmel_i2s_probe()
614 	base = devm_ioremap_resource(&pdev->dev, mem);  in atmel_i2s_probe()
618 	regmap = devm_regmap_init_mmio(&pdev->dev, base,  in atmel_i2s_probe()
628 	err = devm_request_irq(&pdev->dev, irq, atmel_i2s_interrupt, 0,  in atmel_i2s_probe()
629 			       dev_name(&pdev->dev), dev);  in atmel_i2s_probe()
633 	/* Get the peripheral clock. */  in atmel_i2s_probe()
634 	dev->pclk = devm_clk_get(&pdev->dev, "pclk");  in atmel_i2s_probe()
635 	if (IS_ERR(dev->pclk)) {  in atmel_i2s_probe()
636 		err = PTR_ERR(dev->pclk);  in atmel_i2s_probe()
637 		dev_err(&pdev->dev,  in atmel_i2s_probe()
638 			"failed to get the peripheral clock: %d\n", err);  in atmel_i2s_probe()
642 	/* Get audio clock to generate the I2S Master Clock (I2S_MCK) */  in atmel_i2s_probe()
643 	dev->gclk = devm_clk_get(&pdev->dev, "gclk");  in atmel_i2s_probe()
644 	if (IS_ERR(dev->gclk)) {  in atmel_i2s_probe()
645 		if (PTR_ERR(dev->gclk) == -EPROBE_DEFER)  in atmel_i2s_probe()
646 			return -EPROBE_DEFER;  in atmel_i2s_probe()
647 		/* Master Mode not supported */  in atmel_i2s_probe()
648 		dev->gclk = NULL;  in atmel_i2s_probe()
650 	dev->dev = &pdev->dev;  in atmel_i2s_probe()
651 	dev->regmap = regmap;  in atmel_i2s_probe()
655 	if (dev->caps && dev->caps->mck_init) {  in atmel_i2s_probe()
656 		err = dev->caps->mck_init(dev, np);  in atmel_i2s_probe()
661 	/* Enable the peripheral clock. */  in atmel_i2s_probe()
662 	err = clk_prepare_enable(dev->pclk);  in atmel_i2s_probe()
667 	regmap_read(dev->regmap, ATMEL_I2SC_VERSION, &version);  in atmel_i2s_probe()
668 	dev_info(&pdev->dev, "hw version: %#x\n", version);  in atmel_i2s_probe()
671 	regmap_write(dev->regmap, ATMEL_I2SC_IER,  in atmel_i2s_probe()
674 	err = devm_snd_soc_register_component(&pdev->dev,  in atmel_i2s_probe()
678 		dev_err(&pdev->dev, "failed to register DAI: %d\n", err);  in atmel_i2s_probe()
679 		clk_disable_unprepare(dev->pclk);  in atmel_i2s_probe()
684 	dev->playback.addr	= (dma_addr_t)mem->start + ATMEL_I2SC_THR;  in atmel_i2s_probe()
685 	dev->playback.maxburst	= 1;  in atmel_i2s_probe()
686 	dev->capture.addr	= (dma_addr_t)mem->start + ATMEL_I2SC_RHR;  in atmel_i2s_probe()
687 	dev->capture.maxburst	= 1;  in atmel_i2s_probe()
689 	if (of_property_match_string(np, "dma-names", "rx-tx") == 0)  in atmel_i2s_probe()
691 	err = devm_snd_dmaengine_pcm_register(&pdev->dev, NULL, pcm_flags);  in atmel_i2s_probe()
693 		dev_err(&pdev->dev, "failed to register PCM: %d\n", err);  in atmel_i2s_probe()
694 		clk_disable_unprepare(dev->pclk);  in atmel_i2s_probe()
705 	clk_disable_unprepare(dev->pclk);  in atmel_i2s_remove()