ASoC: atmel-pcm: use generic dmaengine framework

Align atmel pcm to use ASoC generic dmaengine framework

DMA is fully device tree based

Signed-off-by: Bo Shen <voice.shen@atmel.com>
Reviewed-by: Lars-Peter Clausen <lars@metafoo.de>
Signed-off-by: Mark Brown <broonie@linaro.org>

2 files changed, 17 insertions, 88 deletions

diff --git a/sound/soc/atmel/Kconfig b/sound/soc/atmel/Kconfig
index 3fdd87fa18a9..1c0b1858638c 100644
--- a/sound/soc/atmel/Kconfig
+++ b/sound/soc/atmel/Kconfig
@@ -13,6 +13,7 @@ config SND_ATMEL_SOC_PDC
 config SND_ATMEL_SOC_DMA
         tristate
         depends on SND_ATMEL_SOC
+        select SND_SOC_GENERIC_DMAENGINE_PCM
 
 config SND_ATMEL_SOC_SSC
         tristate
diff --git a/sound/soc/atmel/atmel-pcm-dma.c b/sound/soc/atmel/atmel-pcm-dma.c
index 5a57803cb180..3ff5601eef10 100644
--- a/sound/soc/atmel/atmel-pcm-dma.c
+++ b/sound/soc/atmel/atmel-pcm-dma.c
@@ -89,124 +89,52 @@ static void atmel_pcm_dma_irq(u32 ssc_sr,
         }
 }
 
-/*--------------------------------------------------------------------------*\
- * DMAENGINE operations
-\*--------------------------------------------------------------------------*/
-static bool filter(struct dma_chan *chan, void *slave)
-{
-        struct at_dma_slave *sl = slave;
-
-        if (sl->dma_dev == chan->device->dev) {
-                chan->private = sl;
-                return true;
-        } else {
-                return false;
-        }
-}
-
 static int atmel_pcm_configure_dma(struct snd_pcm_substream *substream,
-        struct snd_pcm_hw_params *params, struct atmel_pcm_dma_params *prtd)
+        struct snd_pcm_hw_params *params, struct dma_slave_config *slave_config)
 {
+        struct snd_soc_pcm_runtime *rtd = substream->private_data;
+        struct atmel_pcm_dma_params *prtd;
         struct ssc_device *ssc;
-        struct dma_chan *dma_chan;
-        struct dma_slave_config slave_config;
         int ret;
 
+        prtd = snd_soc_dai_get_dma_data(rtd->cpu_dai, substream);
         ssc = prtd->ssc;
 
-        ret = snd_hwparams_to_dma_slave_config(substream, params,
-                        &slave_config);
+        ret = snd_hwparams_to_dma_slave_config(substream, params, slave_config);
         if (ret) {
                 pr_err("atmel-pcm: hwparams to dma slave configure failed\n");
                 return ret;
         }
 
         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
-                slave_config.dst_addr = (dma_addr_t)ssc->phybase + SSC_THR;
-                slave_config.dst_maxburst = 1;
+                slave_config->dst_addr = ssc->phybase + SSC_THR;
+                slave_config->dst_maxburst = 1;
         } else {
-                slave_config.src_addr = (dma_addr_t)ssc->phybase + SSC_RHR;
-                slave_config.src_maxburst = 1;
-        }
-
-        dma_chan = snd_dmaengine_pcm_get_chan(substream);
-        if (dmaengine_slave_config(dma_chan, &slave_config)) {
-                pr_err("atmel-pcm: failed to configure dma channel\n");
-                ret = -EBUSY;
-                return ret;
-        }
-
-        return 0;
-}
-
-static int atmel_pcm_hw_params(struct snd_pcm_substream *substream,
-        struct snd_pcm_hw_params *params)
-{
-        struct snd_soc_pcm_runtime *rtd = substream->private_data;
-        struct atmel_pcm_dma_params *prtd;
-        struct ssc_device *ssc;
-        struct at_dma_slave *sdata = NULL;
-        int ret;
-
-        snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer);
-
-        prtd = snd_soc_dai_get_dma_data(rtd->cpu_dai, substream);
-        ssc = prtd->ssc;
-        if (ssc->pdev)
-                sdata = ssc->pdev->dev.platform_data;
-
-        ret = snd_dmaengine_pcm_open_request_chan(substream, filter, sdata);
-        if (ret) {
-                pr_err("atmel-pcm: dmaengine pcm open failed\n");
-                return -EINVAL;
-        }
-
-        ret = atmel_pcm_configure_dma(substream, params, prtd);
-        if (ret) {
-                pr_err("atmel-pcm: failed to configure dmai\n");
-                goto err;
+                slave_config->src_addr = ssc->phybase + SSC_RHR;
+                slave_config->src_maxburst = 1;
         }
 
         prtd->dma_intr_handler = atmel_pcm_dma_irq;
 
         return 0;
-err:
-        snd_dmaengine_pcm_close_release_chan(substream);
-        return ret;
-}
-
-static int atmel_pcm_open(struct snd_pcm_substream *substream)
-{
-        snd_soc_set_runtime_hwparams(substream, &atmel_pcm_dma_hardware);
-
-        return 0;
 }
 
-static struct snd_pcm_ops atmel_pcm_ops = {
-        .open           = atmel_pcm_open,
-        .close          = snd_dmaengine_pcm_close_release_chan,
-        .ioctl          = snd_pcm_lib_ioctl,
-        .hw_params      = atmel_pcm_hw_params,
-        .trigger        = snd_dmaengine_pcm_trigger,
-        .pointer        = snd_dmaengine_pcm_pointer_no_residue,
-        .mmap           = atmel_pcm_mmap,
-};
-
-static struct snd_soc_platform_driver atmel_soc_platform = {
-        .ops            = &atmel_pcm_ops,
-        .pcm_new        = atmel_pcm_new,
-        .pcm_free       = atmel_pcm_free,
+static const struct snd_dmaengine_pcm_config atmel_dmaengine_pcm_config = {
+        .prepare_slave_config = atmel_pcm_configure_dma,
+        .pcm_hardware = &atmel_pcm_dma_hardware,
+        .prealloc_buffer_size = ATMEL_SSC_DMABUF_SIZE,
 };
 
 int atmel_pcm_dma_platform_register(struct device *dev)
 {
-        return snd_soc_register_platform(dev, &atmel_soc_platform);
+        return snd_dmaengine_pcm_register(dev, &atmel_dmaengine_pcm_config,
+                        SND_DMAENGINE_PCM_FLAG_NO_RESIDUE);
 }
 EXPORT_SYMBOL(atmel_pcm_dma_platform_register);
 
 void atmel_pcm_dma_platform_unregister(struct device *dev)
 {
-        snd_soc_unregister_platform(dev);
+        snd_dmaengine_pcm_unregister(dev);
 }
 EXPORT_SYMBOL(atmel_pcm_dma_platform_unregister);