ASoC: mxs: Use generic dmaengine PCM

Use the generic dmaengine PCM driver instead of a custom implementation.

Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
Tested-by: Shawn Guo <shawn.guo@linaro.org>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>

2 files changed, 12 insertions, 126 deletions

diff --git a/sound/soc/mxs/Kconfig b/sound/soc/mxs/Kconfig
index b6fa77678d97..78d321cbe8b4 100644
--- a/sound/soc/mxs/Kconfig
+++ b/sound/soc/mxs/Kconfig
@@ -1,7 +1,7 @@
 menuconfig SND_MXS_SOC
         tristate "SoC Audio for Freescale MXS CPUs"
         depends on ARCH_MXS
-        select SND_SOC_DMAENGINE_PCM
+        select SND_SOC_GENERIC_DMAENGINE_PCM
         help
           Say Y or M if you want to add support for codecs attached to
           the MXS SAIF interface.
diff --git a/sound/soc/mxs/mxs-pcm.c b/sound/soc/mxs/mxs-pcm.c
index 907cdb1f989d..b41fffc056fb 100644
--- a/sound/soc/mxs/mxs-pcm.c
+++ b/sound/soc/mxs/mxs-pcm.c
@@ -18,27 +18,18 @@
  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  */
 
-#include <linux/clk.h>
-#include <linux/delay.h>
 #include <linux/device.h>
-#include <linux/dma-mapping.h>
 #include <linux/init.h>
-#include <linux/interrupt.h>
 #include <linux/module.h>
-#include <linux/platform_device.h>
-#include <linux/slab.h>
-#include <linux/dmaengine.h>
 
 #include <sound/core.h>
-#include <sound/initval.h>
 #include <sound/pcm.h>
-#include <sound/pcm_params.h>
 #include <sound/soc.h>
 #include <sound/dmaengine_pcm.h>
 
 #include "mxs-pcm.h"
 
-static struct snd_pcm_hardware snd_mxs_hardware = {
+static const struct snd_pcm_hardware snd_mxs_hardware = {
         .info                   = SNDRV_PCM_INFO_MMAP |
                                   SNDRV_PCM_INFO_MMAP_VALID |
                                   SNDRV_PCM_INFO_PAUSE |
@@ -56,7 +47,6 @@ static struct snd_pcm_hardware snd_mxs_hardware = {
         .periods_max            = 52,
         .buffer_bytes_max       = 64 * 1024,
         .fifo_size              = 32,
-
 };
 
 static bool filter(struct dma_chan *chan, void *param)
@@ -74,129 +64,25 @@ static bool filter(struct dma_chan *chan, void *param)
         return true;
 }
 
-static int snd_mxs_pcm_hw_params(struct snd_pcm_substream *substream,
-                                struct snd_pcm_hw_params *params)
-{
-        snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer);
-
-        return 0;
-}
-
-static int snd_mxs_open(struct snd_pcm_substream *substream)
-{
-        struct snd_soc_pcm_runtime *rtd = substream->private_data;
-
-        snd_soc_set_runtime_hwparams(substream, &snd_mxs_hardware);
-
-        return snd_dmaengine_pcm_open_request_chan(substream, filter,
-                snd_soc_dai_get_dma_data(rtd->cpu_dai, substream));
-}
-
-static int snd_mxs_pcm_mmap(struct snd_pcm_substream *substream,
-                struct vm_area_struct *vma)
-{
-        struct snd_pcm_runtime *runtime = substream->runtime;
-
-        return dma_mmap_writecombine(substream->pcm->card->dev, vma,
-                                        runtime->dma_area,
-                                        runtime->dma_addr,
-                                        runtime->dma_bytes);
-}
-
-static struct snd_pcm_ops mxs_pcm_ops = {
-        .open           = snd_mxs_open,
-        .close          = snd_dmaengine_pcm_close_release_chan,
-        .ioctl          = snd_pcm_lib_ioctl,
-        .hw_params      = snd_mxs_pcm_hw_params,
-        .trigger        = snd_dmaengine_pcm_trigger,
-        .pointer        = snd_dmaengine_pcm_pointer_no_residue,
-        .mmap           = snd_mxs_pcm_mmap,
-};
-
-static int mxs_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 = snd_mxs_hardware.buffer_bytes_max;
-
-        buf->dev.type = SNDRV_DMA_TYPE_DEV;
-        buf->dev.dev = pcm->card->dev;
-        buf->private_data = NULL;
-        buf->area = dma_alloc_writecombine(pcm->card->dev, size,
-                                           &buf->addr, GFP_KERNEL);
-        if (!buf->area)
-                return -ENOMEM;
-        buf->bytes = size;
-
-        return 0;
-}
-
-static u64 mxs_pcm_dmamask = DMA_BIT_MASK(32);
-static int mxs_pcm_new(struct snd_soc_pcm_runtime *rtd)
-{
-        struct snd_card *card = rtd->card->snd_card;
-        struct snd_pcm *pcm = rtd->pcm;
-        int ret = 0;
-
-        if (!card->dev->dma_mask)
-                card->dev->dma_mask = &mxs_pcm_dmamask;
-        if (!card->dev->coherent_dma_mask)
-                card->dev->coherent_dma_mask = DMA_BIT_MASK(32);
-
-        if (pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream) {
-                ret = mxs_pcm_preallocate_dma_buffer(pcm,
-                        SNDRV_PCM_STREAM_PLAYBACK);
-                if (ret)
-                        goto out;
-        }
-
-        if (pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream) {
-                ret = mxs_pcm_preallocate_dma_buffer(pcm,
-                        SNDRV_PCM_STREAM_CAPTURE);
-                if (ret)
-                        goto out;
-        }
-
-out:
-        return ret;
-}
-
-static void mxs_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_writecombine(pcm->card->dev, buf->bytes,
-                                      buf->area, buf->addr);
-                buf->area = NULL;
-        }
-}
-
-static struct snd_soc_platform_driver mxs_soc_platform = {
-        .ops            = &mxs_pcm_ops,
-        .pcm_new        = mxs_pcm_new,
-        .pcm_free       = mxs_pcm_free,
+static const struct snd_dmaengine_pcm_config mxs_dmaengine_pcm_config = {
+        .pcm_hardware = &snd_mxs_hardware,
+        .compat_filter_fn = filter,
+        .prealloc_buffer_size = 64 * 1024,
 };
 
 int mxs_pcm_platform_register(struct device *dev)
 {
-        return snd_soc_register_platform(dev, &mxs_soc_platform);
+        return snd_dmaengine_pcm_register(dev, &mxs_dmaengine_pcm_config,
+                SND_DMAENGINE_PCM_FLAG_NO_RESIDUE |
+                SND_DMAENGINE_PCM_FLAG_NO_DT |
+                SND_DMAENGINE_PCM_FLAG_COMPAT |
+                SND_DMAENGINE_PCM_FLAG_HALF_DUPLEX);
 }
 EXPORT_SYMBOL_GPL(mxs_pcm_platform_register);
 
 void mxs_pcm_platform_unregister(struct device *dev)
 {
-        snd_soc_unregister_platform(dev);
+        snd_dmaengine_pcm_unregister(dev);
 }
 EXPORT_SYMBOL_GPL(mxs_pcm_platform_unregister);