1 // SPDX-License-Identifier: GPL-2.0-only
29  * ---- I2S Controller Register map ----
44  * ---- Control Register (Write-only) ----
55  * ---- Mode Register (Read/Write) ----
96 /* x sample transmitted when underrun */
98 #define ATMEL_I2SC_MR_TXSAME_ZERO	(0 << 14)  /* Zero sample */
99 #define ATMEL_I2SC_MR_TXSAME_PREVIOUS	(1 << 14)  /* Previous sample */
124  * ---- Status Registers ----
143  * ---- Interrupt Enable/Disable/Mask Registers ----
196 	struct clk				*pclk;  member
212 	regmap_read(dev->regmap, ATMEL_I2SC_SR, &sr);  in atmel_i2s_interrupt()
213 	regmap_read(dev->regmap, ATMEL_I2SC_IMR, &imr);  in atmel_i2s_interrupt()
225 				dev_err(dev->dev,  in atmel_i2s_interrupt()
229 		regmap_write(dev->regmap, ATMEL_I2SC_SCR, mask);  in atmel_i2s_interrupt()
239 				dev_err(dev->dev,  in atmel_i2s_interrupt()
243 		regmap_write(dev->regmap, ATMEL_I2SC_SCR, mask);  in atmel_i2s_interrupt()
264 	dev->fmt = fmt;  in atmel_i2s_set_dai_fmt()
272 	bool is_playback = (substream->stream == SNDRV_PCM_STREAM_PLAYBACK);  in atmel_i2s_prepare()
276 		regmap_read(dev->regmap, ATMEL_I2SC_SR, &sr);  in atmel_i2s_prepare()
283 			dev_dbg(dev->dev, "RXRDY is set\n");  in atmel_i2s_prepare()
284 			regmap_read(dev->regmap, ATMEL_I2SC_RHR, &rhr);  in atmel_i2s_prepare()
295 	if (!dev->gclk) {  in atmel_i2s_get_gck_param()
296 		dev_err(dev->dev, "cannot generate the I2S Master Clock\n");  in atmel_i2s_get_gck_param()
297 		return -EINVAL;  in atmel_i2s_get_gck_param()
304 	dev->gck_param = NULL;  in atmel_i2s_get_gck_param()
308 		int val = abs(fs - gck_param->fs);  in atmel_i2s_get_gck_param()
312 			dev->gck_param = gck_param;  in atmel_i2s_get_gck_param()
324 	bool is_playback = (substream->stream == SNDRV_PCM_STREAM_PLAYBACK);  in atmel_i2s_hw_params()
335 	switch (dev->fmt & SND_SOC_DAIFMT_FORMAT_MASK) {  in atmel_i2s_hw_params()
341 		dev_err(dev->dev, "unsupported bus format\n");  in atmel_i2s_hw_params()
342 		return -EINVAL;  in atmel_i2s_hw_params()
345 	switch (dev->fmt & SND_SOC_DAIFMT_CLOCK_PROVIDER_MASK) {  in atmel_i2s_hw_params()
357 		dev->gck_param = NULL;  in atmel_i2s_hw_params()
361 		dev_err(dev->dev, "unsupported master/slave mode\n");  in atmel_i2s_hw_params()
362 		return -EINVAL;  in atmel_i2s_hw_params()
375 		dev_err(dev->dev, "unsupported number of audio channels\n");  in atmel_i2s_hw_params()
376 		return -EINVAL;  in atmel_i2s_hw_params()
409 		dev_err(dev->dev, "unsupported size/endianness for audio samples\n");  in atmel_i2s_hw_params()
410 		return -EINVAL;  in atmel_i2s_hw_params()
413 	return regmap_update_bits(dev->regmap, ATMEL_I2SC_MR, mr_mask, mr);  in atmel_i2s_hw_params()
430 		ret = regmap_write(dev->regmap, ATMEL_I2SC_CR,  in atmel_i2s_switch_mck_generator()
436 		ret = regmap_update_bits(dev->regmap, ATMEL_I2SC_MR,  in atmel_i2s_switch_mck_generator()
442 		clk_disable_unprepare(dev->gclk);  in atmel_i2s_switch_mck_generator()
447 	if (!dev->gck_param)  in atmel_i2s_switch_mck_generator()
448 		return -EINVAL;  in atmel_i2s_switch_mck_generator()
450 	gclk_rate = dev->gck_param->mck * (dev->gck_param->imckdiv + 1);  in atmel_i2s_switch_mck_generator()
452 	ret = clk_set_rate(dev->gclk, gclk_rate);  in atmel_i2s_switch_mck_generator()
456 	ret = clk_prepare_enable(dev->gclk);  in atmel_i2s_switch_mck_generator()
461 	mr |= ATMEL_I2SC_MR_IMCKDIV(dev->gck_param->imckdiv);  in atmel_i2s_switch_mck_generator()
462 	mr |= ATMEL_I2SC_MR_IMCKFS(dev->gck_param->imckfs);  in atmel_i2s_switch_mck_generator()
464 	ret = regmap_update_bits(dev->regmap, ATMEL_I2SC_MR, mr_mask, mr);  in atmel_i2s_switch_mck_generator()
469 	return regmap_write(dev->regmap, ATMEL_I2SC_CR,  in atmel_i2s_switch_mck_generator()
477 	bool is_playback = (substream->stream == SNDRV_PCM_STREAM_PLAYBACK);  in atmel_i2s_trigger()
496 		return -EINVAL;  in atmel_i2s_trigger()
500 	err = regmap_read(dev->regmap, ATMEL_I2SC_MR, &mr);  in atmel_i2s_trigger()
507 		if (!dev->clk_use_no) {  in atmel_i2s_trigger()
512 		dev->clk_use_no++;  in atmel_i2s_trigger()
515 	err = regmap_write(dev->regmap, ATMEL_I2SC_CR, cr);  in atmel_i2s_trigger()
521 		if (dev->clk_use_no == 1) {  in atmel_i2s_trigger()
526 		dev->clk_use_no--;  in atmel_i2s_trigger()
543 	snd_soc_dai_init_dma_data(dai, &dev->playback, &dev->capture);  in atmel_i2s_dai_probe()
567 	.name			= "atmel-i2s",
577 	if (!dev->gclk)  in atmel_i2s_sama5d2_mck_init()
581 	muxclk = devm_clk_get(dev->dev, "muxclk");  in atmel_i2s_sama5d2_mck_init()
584 		if (err == -EPROBE_DEFER)  in atmel_i2s_sama5d2_mck_init()
585 			return -EPROBE_DEFER;  in atmel_i2s_sama5d2_mck_init()
586 		dev_dbg(dev->dev,  in atmel_i2s_sama5d2_mck_init()
591 	return clk_set_parent(muxclk, dev->gclk);  in atmel_i2s_sama5d2_mck_init()
600 		.compatible = "atmel,sama5d2-i2s",
611 	struct device_node *np = pdev->dev.of_node;  in atmel_i2s_probe()
623 	dev = devm_kzalloc(&pdev->dev, sizeof(*dev), GFP_KERNEL);  in atmel_i2s_probe()
625 		return -ENOMEM;  in atmel_i2s_probe()
630 		dev->caps = match->data;  in atmel_i2s_probe()
637 	regmap = devm_regmap_init_mmio(&pdev->dev, base,  in atmel_i2s_probe()
647 	err = devm_request_irq(&pdev->dev, irq, atmel_i2s_interrupt, 0,  in atmel_i2s_probe()
648 			       dev_name(&pdev->dev), dev);  in atmel_i2s_probe()
653 	dev->pclk = devm_clk_get(&pdev->dev, "pclk");  in atmel_i2s_probe()
654 	if (IS_ERR(dev->pclk)) {  in atmel_i2s_probe()
655 		err = PTR_ERR(dev->pclk);  in atmel_i2s_probe()
656 		dev_err(&pdev->dev,  in atmel_i2s_probe()
662 	dev->gclk = devm_clk_get(&pdev->dev, "gclk");  in atmel_i2s_probe()
663 	if (IS_ERR(dev->gclk)) {  in atmel_i2s_probe()
664 		if (PTR_ERR(dev->gclk) == -EPROBE_DEFER)  in atmel_i2s_probe()
665 			return -EPROBE_DEFER;  in atmel_i2s_probe()
667 		dev->gclk = NULL;  in atmel_i2s_probe()
669 	dev->dev = &pdev->dev;  in atmel_i2s_probe()
670 	dev->regmap = regmap;  in atmel_i2s_probe()
674 	if (dev->caps && dev->caps->mck_init) {  in atmel_i2s_probe()
675 		err = dev->caps->mck_init(dev, np);  in atmel_i2s_probe()
681 	err = clk_prepare_enable(dev->pclk);  in atmel_i2s_probe()
686 	regmap_read(dev->regmap, ATMEL_I2SC_VERSION, &version);  in atmel_i2s_probe()
687 	dev_info(&pdev->dev, "hw version: %#x\n", version);  in atmel_i2s_probe()
690 	regmap_write(dev->regmap, ATMEL_I2SC_IER,  in atmel_i2s_probe()
693 	err = devm_snd_soc_register_component(&pdev->dev,  in atmel_i2s_probe()
697 		dev_err(&pdev->dev, "failed to register DAI: %d\n", err);  in atmel_i2s_probe()
698 		clk_disable_unprepare(dev->pclk);  in atmel_i2s_probe()
703 	dev->playback.addr	= (dma_addr_t)mem->start + ATMEL_I2SC_THR;  in atmel_i2s_probe()
704 	dev->playback.maxburst	= 1;  in atmel_i2s_probe()
705 	dev->capture.addr	= (dma_addr_t)mem->start + ATMEL_I2SC_RHR;  in atmel_i2s_probe()
706 	dev->capture.maxburst	= 1;  in atmel_i2s_probe()
708 	if (of_property_match_string(np, "dma-names", "rx-tx") == 0)  in atmel_i2s_probe()
710 	err = devm_snd_dmaengine_pcm_register(&pdev->dev, NULL, pcm_flags);  in atmel_i2s_probe()
712 		dev_err(&pdev->dev, "failed to register PCM: %d\n", err);  in atmel_i2s_probe()
713 		clk_disable_unprepare(dev->pclk);  in atmel_i2s_probe()
724 	clk_disable_unprepare(dev->pclk);  in atmel_i2s_remove()