1 // SPDX-License-Identifier: GPL-2.0-or-later
3  * kirkwood-dma.c
6  * (c) 2010 Arnaud Patard <arnaud.patard@rtp-net.org>
15 #include <linux/dma-mapping.h>
44 	unsigned long mask, status, cause;  in kirkwood_dma_irq()  local
46 	mask = readl(priv->io + KIRKWOOD_INT_MASK);  in kirkwood_dma_irq()
47 	status = readl(priv->io + KIRKWOOD_INT_CAUSE) & mask;  in kirkwood_dma_irq()
49 	cause = readl(priv->io + KIRKWOOD_ERR_CAUSE);  in kirkwood_dma_irq()
53 		writel(cause, priv->io + KIRKWOOD_ERR_CAUSE);  in kirkwood_dma_irq()
65 	writel(status, priv->io + KIRKWOOD_INT_CAUSE);  in kirkwood_dma_irq()
68 		snd_pcm_period_elapsed(priv->substream_play);  in kirkwood_dma_irq()
71 		snd_pcm_period_elapsed(priv->substream_rec);  in kirkwood_dma_irq()
87 	/* try to find matching cs for current dma address */  in kirkwood_dma_conf_mbus_windows()
88 	for (i = 0; i < dram->num_cs; i++) {  in kirkwood_dma_conf_mbus_windows()
89 		const struct mbus_dram_window *cs = &dram->cs[i];  in kirkwood_dma_conf_mbus_windows()  local
90 		if ((cs->base & 0xffff0000) < (dma & 0xffff0000)) {  in kirkwood_dma_conf_mbus_windows()
91 			writel(cs->base & 0xffff0000,  in kirkwood_dma_conf_mbus_windows()
93 			writel(((cs->size - 1) & 0xffff0000) |  in kirkwood_dma_conf_mbus_windows()
94 				(cs->mbus_attr << 8) |  in kirkwood_dma_conf_mbus_windows()
95 				(dram->mbus_dram_target_id << 4) | 1,  in kirkwood_dma_conf_mbus_windows()
105 	struct snd_pcm_runtime *runtime = substream->runtime;  in kirkwood_dma_open()
113 			priv->burst * 2,  in kirkwood_dma_open()
114 			KIRKWOOD_AUDIO_BUF_MAX-1);  in kirkwood_dma_open()
120 			priv->burst);  in kirkwood_dma_open()
124 	err = snd_pcm_hw_constraint_step(substream->runtime, 0,  in kirkwood_dma_open()
126 			 priv->burst);  in kirkwood_dma_open()
130 	if (!priv->substream_play && !priv->substream_rec) {  in kirkwood_dma_open()
131 		err = request_irq(priv->irq, kirkwood_dma_irq, IRQF_SHARED,  in kirkwood_dma_open()
132 				  "kirkwood-i2s", priv);  in kirkwood_dma_open()
137 		 * Enable Error interrupts. We're only ack'ing them but  in kirkwood_dma_open()
140 		writel((unsigned int)-1, priv->io + KIRKWOOD_ERR_MASK);  in kirkwood_dma_open()
143 	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {  in kirkwood_dma_open()
144 		if (priv->substream_play)  in kirkwood_dma_open()
145 			return -EBUSY;  in kirkwood_dma_open()
146 		priv->substream_play = substream;  in kirkwood_dma_open()
148 		if (priv->substream_rec)  in kirkwood_dma_open()
149 			return -EBUSY;  in kirkwood_dma_open()
150 		priv->substream_rec = substream;  in kirkwood_dma_open()
164 	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)  in kirkwood_dma_close()
165 		priv->substream_play = NULL;  in kirkwood_dma_close()
167 		priv->substream_rec = NULL;  in kirkwood_dma_close()
169 	if (!priv->substream_play && !priv->substream_rec) {  in kirkwood_dma_close()
170 		writel(0, priv->io + KIRKWOOD_ERR_MASK);  in kirkwood_dma_close()
171 		free_irq(priv->irq, priv);  in kirkwood_dma_close()
183 	unsigned long addr = substream->runtime->dma_addr;  in kirkwood_dma_hw_params()
188 	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)  in kirkwood_dma_hw_params()
189 		kirkwood_dma_conf_mbus_windows(priv->io,  in kirkwood_dma_hw_params()
192 		kirkwood_dma_conf_mbus_windows(priv->io,  in kirkwood_dma_hw_params()
200 	struct snd_pcm_runtime *runtime = substream->runtime;  in kirkwood_dma_prepare()
205 	size = frames_to_bytes(runtime, runtime->buffer_size);  in kirkwood_dma_prepare()
206 	size = (size>>2)-1;  in kirkwood_dma_prepare()
209 	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {  in kirkwood_dma_prepare()
210 		writel(count, priv->io + KIRKWOOD_PLAY_BYTE_INT_COUNT);  in kirkwood_dma_prepare()
211 		writel(runtime->dma_addr, priv->io + KIRKWOOD_PLAY_BUF_ADDR);  in kirkwood_dma_prepare()
212 		writel(size, priv->io + KIRKWOOD_PLAY_BUF_SIZE);  in kirkwood_dma_prepare()
214 		writel(count, priv->io + KIRKWOOD_REC_BYTE_INT_COUNT);  in kirkwood_dma_prepare()
215 		writel(runtime->dma_addr, priv->io + KIRKWOOD_REC_BUF_ADDR);  in kirkwood_dma_prepare()
216 		writel(size, priv->io + KIRKWOOD_REC_BUF_SIZE);  in kirkwood_dma_prepare()
230 	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)  in kirkwood_dma_pointer()
231 		count = bytes_to_frames(substream->runtime,  in kirkwood_dma_pointer()
232 			readl(priv->io + KIRKWOOD_PLAY_BYTE_COUNT));  in kirkwood_dma_pointer()
234 		count = bytes_to_frames(substream->runtime,  in kirkwood_dma_pointer()
235 			readl(priv->io + KIRKWOOD_REC_BYTE_COUNT));  in kirkwood_dma_pointer()
244 	struct snd_card *card = rtd->card->snd_card;  in kirkwood_dma_new()
247 	ret = dma_coerce_mask_and_coherent(card->dev, DMA_BIT_MASK(32));  in kirkwood_dma_new()
251 	snd_pcm_set_managed_buffer_all(rtd->pcm, SNDRV_DMA_TYPE_DEV,  in kirkwood_dma_new()
252 				       card->dev, size, size);  in kirkwood_dma_new()