1 // SPDX-License-Identifier: GPL-2.0-only
9  * The I2S interface consists of two ring buffers - one for RX and one for
11  * on which way the data is flowing, either the software or the hardware
25  * busy-waiting, which would keep stalling the kernel for quite a long time.
30  * are wait-free.
70 	.name = "chv3-i2s",
103 	writel(val, i2s->iobase + offset);  in chv3_i2s_wr()
108 	return readl(i2s->iobase + offset);  in chv3_i2s_rd()
116 	reg = readl(i2s->iobase_irq + I2S_IRQ_CLR);  in chv3_i2s_isr()
121 		snd_pcm_period_elapsed(i2s->rx_substream);  in chv3_i2s_isr()
124 		snd_pcm_period_elapsed(i2s->tx_substream);  in chv3_i2s_isr()
126 	writel(reg, i2s->iobase_irq + I2S_IRQ_CLR);  in chv3_i2s_isr()
140 	res = snd_pcm_hw_constraint_pow2(substream->runtime, 0,  in chv3_dma_open()
145 	if (substream->stream == SNDRV_PCM_STREAM_CAPTURE)  in chv3_dma_open()
146 		i2s->rx_substream = substream;  in chv3_dma_open()
148 		i2s->tx_substream = substream;  in chv3_dma_open()
158 	if (substream->pstr->stream == SNDRV_PCM_STREAM_CAPTURE)  in chv3_dma_close()
173 	substream = rtd->pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream;  in chv3_dma_pcm_construct()
175 		res = snd_dma_alloc_pages(SNDRV_DMA_TYPE_DEV, i2s->dev,  in chv3_dma_pcm_construct()
176 				I2S_MAX_BUFFER_SIZE, &substream->dma_buffer);  in chv3_dma_pcm_construct()
181 	substream = rtd->pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream;  in chv3_dma_pcm_construct()
183 		res = snd_dma_alloc_pages(SNDRV_DMA_TYPE_DEV, i2s->dev,  in chv3_dma_pcm_construct()
184 				I2S_MAX_BUFFER_SIZE, &substream->dma_buffer);  in chv3_dma_pcm_construct()
196 	snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer);  in chv3_dma_hw_params()
209 	period_size = substream->runtime->period_size;  in chv3_dma_prepare()
211 	if (substream->pstr->stream == SNDRV_PCM_STREAM_CAPTURE) {  in chv3_dma_prepare()
213 		chv3_i2s_wr(i2s, I2S_RX_BASE_ADDR, substream->dma_buffer.addr);  in chv3_dma_prepare()
219 		chv3_i2s_wr(i2s, I2S_TX_BASE_ADDR, substream->dma_buffer.addr);  in chv3_dma_prepare()
221 		chv3_i2s_wr(i2s, I2S_TX_IRQ, ((period_bytes / i2s->tx_bytes_to_fetch) << 8) | 1);  in chv3_dma_prepare()
224 	writel(I2S_IRQ_RX_BIT | I2S_IRQ_TX_BIT, i2s->iobase_irq + I2S_IRQ_MASK);  in chv3_dma_prepare()
237 	frame_bytes = substream->runtime->frame_bits * 8;  in chv3_dma_pointer()
240 	if (substream->pstr->stream == SNDRV_PCM_STREAM_CAPTURE) {  in chv3_dma_pointer()
245 		idx_bytes = (idx_bytes - frame_bytes) & (buffer_bytes - 1);  in chv3_dma_pointer()
248 	return bytes_to_frames(substream->runtime, idx_bytes);  in chv3_dma_pointer()
254 	struct snd_pcm_runtime *runtime = substream->runtime;  in chv3_dma_ack()
259 	bytes = frames_to_bytes(runtime, runtime->control->appl_ptr);  in chv3_dma_ack()
260 	idx = bytes & (snd_pcm_lib_buffer_bytes(substream) - 1);  in chv3_dma_ack()
262 	if (substream->pstr->stream == SNDRV_PCM_STREAM_CAPTURE)  in chv3_dma_ack()
271 	.name = "chv3-i2s-comp",
287 	i2s = devm_kzalloc(&pdev->dev, sizeof(*i2s), GFP_KERNEL);  in chv3_i2s_probe()
289 		return -ENOMEM;  in chv3_i2s_probe()
291 	i2s->iobase = devm_platform_ioremap_resource(pdev, 0);  in chv3_i2s_probe()
292 	if (IS_ERR(i2s->iobase))  in chv3_i2s_probe()
293 		return PTR_ERR(i2s->iobase);  in chv3_i2s_probe()
295 	i2s->iobase_irq = devm_platform_ioremap_resource(pdev, 1);  in chv3_i2s_probe()
296 	if (IS_ERR(i2s->iobase_irq))  in chv3_i2s_probe()
297 		return PTR_ERR(i2s->iobase_irq);  in chv3_i2s_probe()
299 	i2s->tx_bytes_to_fetch = (chv3_i2s_rd(i2s, I2S_TX_IRQ_CONST) >> 8) & 0xffff;  in chv3_i2s_probe()
301 	i2s->dev = &pdev->dev;  in chv3_i2s_probe()
302 	dev_set_drvdata(&pdev->dev, i2s);  in chv3_i2s_probe()
306 		return -ENXIO;  in chv3_i2s_probe()
307 	res = devm_request_irq(i2s->dev, irq, chv3_i2s_isr, 0, "chv3-i2s", i2s);  in chv3_i2s_probe()
311 	res = devm_snd_soc_register_component(&pdev->dev, &chv3_i2s_comp,  in chv3_i2s_probe()
314 		dev_err(&pdev->dev, "couldn't register component: %d\n", res);  in chv3_i2s_probe()
322 	{ .compatible = "google,chv3-i2s" },
330 		.name = "chv3-i2s",