ASoC: fsl: imx-pcm-fiq: Use managed buffer allocation

As the standard buffer allocation helper supports WC pages now, we can
convert imx-pcm-fiq driver to use that.  This allows us to remove lots
of superfluous code.

Cc: Nicolin Chen <nicoleotsuka@gmail.com>
Cc: Xiubo Li <Xiubo.Lee@gmail.com>
Cc: Fabio Estevam <festevam@gmail.com>
Cc: Shengjiu Wang <shengjiu.wang@gmail.com>
Acked-by: Mark Brown <broonie@kernel.org>
Link: https://lore.kernel.org/r/20210802072815.13551-8-tiwai@suse.deSigned-off-by: Takashi Iwai <tiwai@suse.de>

sound/soc/fsl/imx-pcm-fiq.c

@@ -81,7 +81,6 @@ static int snd_imx_pcm_hw_params(struct snd_soc_component *component,
 	iprtd->offset = 0;
 	iprtd->poll_time_ns = 1000000000 / params_rate(params) *
 				params_period_size(params);
-	snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer);
 
 	return 0;
 }
@@ -213,40 +212,6 @@ static int snd_imx_close(struct snd_soc_component *component,
 	return 0;
 }
 
-static int snd_imx_pcm_mmap(struct snd_soc_component *component,
-			    struct snd_pcm_substream *substream,
-			    struct vm_area_struct *vma)
-{
-	struct snd_pcm_runtime *runtime = substream->runtime;
-	int ret;
-
-	ret = dma_mmap_wc(substream->pcm->card->dev, vma, runtime->dma_area,
-			  runtime->dma_addr, runtime->dma_bytes);
-
-	pr_debug("%s: ret: %d %p %pad 0x%08zx\n", __func__, ret,
-			runtime->dma_area,
-			&runtime->dma_addr,
-			runtime->dma_bytes);
-	return ret;
-}
-
-static int imx_pcm_preallocate_dma_buffer(struct snd_pcm *pcm, int stream)
-{
-	struct snd_pcm_substream *substream = pcm->streams[stream].substream;
-	struct snd_dma_buffer *buf = &substream->dma_buffer;
-	size_t size = IMX_SSI_DMABUF_SIZE;
-
-	buf->dev.type = SNDRV_DMA_TYPE_DEV;
-	buf->dev.dev = pcm->card->dev;
-	buf->private_data = NULL;
-	buf->area = dma_alloc_wc(pcm->card->dev, size, &buf->addr, GFP_KERNEL);
-	if (!buf->area)
-		return -ENOMEM;
-	buf->bytes = size;
-
-	return 0;
-}
-
 static int imx_pcm_new(struct snd_soc_pcm_runtime *rtd)
 {
 	struct snd_card *card = rtd->card->snd_card;
@@ -257,21 +222,9 @@ static int imx_pcm_new(struct snd_soc_pcm_runtime *rtd)
 	if (ret)
 		return ret;
 
-	if (pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream) {
-		ret = imx_pcm_preallocate_dma_buffer(pcm,
-			SNDRV_PCM_STREAM_PLAYBACK);
-		if (ret)
-			return ret;
-	}
-
-	if (pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream) {
-		ret = imx_pcm_preallocate_dma_buffer(pcm,
-			SNDRV_PCM_STREAM_CAPTURE);
-		if (ret)
-			return ret;
-	}
-
-	return 0;
+	return snd_pcm_set_fixed_buffer_all(pcm, SNDRV_DMA_TYPE_DEV_WC,
+					    pcm->card->dev,
+					    IMX_SSI_DMABUF_SIZE);
 }
 
 static int ssi_irq;
@@ -307,32 +260,11 @@ static int snd_imx_pcm_new(struct snd_soc_component *component,
 	return 0;
 }
 
-static void imx_pcm_free(struct snd_pcm *pcm)
-{
-	struct snd_pcm_substream *substream;
-	struct snd_dma_buffer *buf;
-	int stream;
-
-	for (stream = 0; stream < 2; stream++) {
-		substream = pcm->streams[stream].substream;
-		if (!substream)
-			continue;
-
-		buf = &substream->dma_buffer;
-		if (!buf->area)
-			continue;
-
-		dma_free_wc(pcm->card->dev, buf->bytes, buf->area, buf->addr);
-		buf->area = NULL;
-	}
-}
-
 static void snd_imx_pcm_free(struct snd_soc_component *component,
 			     struct snd_pcm *pcm)
 {
 	mxc_set_irq_fiq(ssi_irq, 0);
 	release_fiq(&fh);
-	imx_pcm_free(pcm);
 }
 
 static const struct snd_soc_component_driver imx_soc_component_fiq = {
@@ -342,7 +274,6 @@ static const struct snd_soc_component_driver imx_soc_component_fiq = {
 	.prepare	= snd_imx_pcm_prepare,
 	.trigger	= snd_imx_pcm_trigger,
 	.pointer	= snd_imx_pcm_pointer,
-	.mmap		= snd_imx_pcm_mmap,
 	.pcm_construct	= snd_imx_pcm_new,
 	.pcm_destruct	= snd_imx_pcm_free,
 };