ASoC: ep93xx-pcm: Use dmaengine PCM helper functions

Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
Acked-by: Vinod Koul <vinod.koul@linux.intel.com>
Tested-by: Mika Westerberg <mika.westerberg@iki.fi>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>

2 files changed, 23 insertions, 126 deletions

diff --git a/sound/soc/ep93xx/Kconfig b/sound/soc/ep93xx/Kconfig
index 91a28de94109..88143db7e753 100644
--- a/sound/soc/ep93xx/Kconfig
+++ b/sound/soc/ep93xx/Kconfig
@@ -1,6 +1,7 @@
 config SND_EP93XX_SOC
         tristate "SoC Audio support for the Cirrus Logic EP93xx series"
         depends on ARCH_EP93XX && SND_SOC
+        select SND_SOC_DMAENGINE_PCM
         help
           Say Y or M if you want to add support for codecs attached to
           the EP93xx I2S or AC97 interfaces.
diff --git a/sound/soc/ep93xx/ep93xx-pcm.c b/sound/soc/ep93xx/ep93xx-pcm.c
index 32adca38b48b..162dbb74f4cc 100644
--- a/sound/soc/ep93xx/ep93xx-pcm.c
+++ b/sound/soc/ep93xx/ep93xx-pcm.c
@@ -23,6 +23,7 @@
 #include <sound/pcm.h>
 #include <sound/pcm_params.h>
 #include <sound/soc.h>
+#include <sound/dmaengine_pcm.h>
 
 #include <mach/dma.h>
 #include <mach/hardware.h>
@@ -52,26 +53,6 @@ static const struct snd_pcm_hardware ep93xx_pcm_hardware = {
         .fifo_size              = 32,
 };
 
-struct ep93xx_runtime_data
-{
-        int                             pointer_bytes;
-        int                             periods;
-        int                             period_bytes;
-        struct dma_chan                 *dma_chan;
-        struct ep93xx_dma_data          dma_data;
-};
-
-static void ep93xx_pcm_dma_callback(void *data)
-{
-        struct snd_pcm_substream *substream = data;
-        struct ep93xx_runtime_data *rtd = substream->runtime->private_data;
-
-        rtd->pointer_bytes += rtd->period_bytes;
-        rtd->pointer_bytes %= rtd->period_bytes * rtd->periods;
-
-        snd_pcm_period_elapsed(substream);
-}
-
 static bool ep93xx_pcm_dma_filter(struct dma_chan *chan, void *filter_param)
 {
         struct ep93xx_dma_data *data = filter_param;
@@ -86,98 +67,48 @@ static bool ep93xx_pcm_dma_filter(struct dma_chan *chan, void *filter_param)
 
 static int ep93xx_pcm_open(struct snd_pcm_substream *substream)
 {
-        struct snd_soc_pcm_runtime *soc_rtd = substream->private_data;
-        struct snd_soc_dai *cpu_dai = soc_rtd->cpu_dai;
+        struct snd_soc_pcm_runtime *rtd = substream->private_data;
+        struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
         struct ep93xx_pcm_dma_params *dma_params;
-        struct ep93xx_runtime_data *rtd;    
-        dma_cap_mask_t mask;
+        struct ep93xx_dma_data *dma_data;
         int ret;
 
-        ret = snd_pcm_hw_constraint_integer(substream->runtime,
-                                            SNDRV_PCM_HW_PARAM_PERIODS);
-        if (ret < 0)
-                return ret;
-
         snd_soc_set_runtime_hwparams(substream, &ep93xx_pcm_hardware);
 
-        rtd = kmalloc(sizeof(*rtd), GFP_KERNEL);
-        if (!rtd) 
+        dma_data = kmalloc(sizeof(*dma_data), GFP_KERNEL);
+        if (!dma_data)
                 return -ENOMEM;
 
-        dma_cap_zero(mask);
-        dma_cap_set(DMA_SLAVE, mask);
-        dma_cap_set(DMA_CYCLIC, mask);
-
         dma_params = snd_soc_dai_get_dma_data(cpu_dai, substream);
-        rtd->dma_data.port = dma_params->dma_port;
-        rtd->dma_data.name = dma_params->name;
-
-        if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
-                rtd->dma_data.direction = DMA_MEM_TO_DEV;
-        else
-                rtd->dma_data.direction = DMA_DEV_TO_MEM;
-
-        rtd->dma_chan = dma_request_channel(mask, ep93xx_pcm_dma_filter,
-                                            &rtd->dma_data);
-        if (!rtd->dma_chan) {
-                kfree(rtd);
-                return -EINVAL;
-        }
-        
-        substream->runtime->private_data = rtd;
-        return 0;
-}
+        dma_data->port = dma_params->dma_port;
+        dma_data->name = dma_params->name;
+        dma_data->direction = snd_pcm_substream_to_dma_direction(substream);
 
-static int ep93xx_pcm_close(struct snd_pcm_substream *substream)
-{
-        struct ep93xx_runtime_data *rtd = substream->runtime->private_data;
+        ret = snd_dmaengine_pcm_open(substream, ep93xx_pcm_dma_filter, dma_data);
+        if (ret) {
+                kfree(dma_data);
+                return ret;
+        }
 
-        dma_release_channel(rtd->dma_chan);
-        kfree(rtd);
-        return 0;
-}
+        snd_dmaengine_pcm_set_data(substream, dma_data);
 
-static int ep93xx_pcm_dma_submit(struct snd_pcm_substream *substream)
-{
-        struct snd_pcm_runtime *runtime = substream->runtime;
-        struct ep93xx_runtime_data *rtd = runtime->private_data;
-        struct dma_chan *chan = rtd->dma_chan;
-        struct dma_device *dma_dev = chan->device;
-        struct dma_async_tx_descriptor *desc;
-
-        rtd->pointer_bytes = 0;
-        desc = dma_dev->device_prep_dma_cyclic(chan, runtime->dma_addr,
-                                               rtd->period_bytes * rtd->periods,
-                                               rtd->period_bytes,
-                                               rtd->dma_data.direction);
-        if (!desc)
-                return -EINVAL;
-
-        desc->callback = ep93xx_pcm_dma_callback;
-        desc->callback_param = substream;
-
-        dmaengine_submit(desc);
         return 0;
 }
 
-static void ep93xx_pcm_dma_flush(struct snd_pcm_substream *substream)
+static int ep93xx_pcm_close(struct snd_pcm_substream *substream)
 {
-        struct snd_pcm_runtime *runtime = substream->runtime;
-        struct ep93xx_runtime_data *rtd = runtime->private_data;
+        struct dma_data *dma_data = snd_dmaengine_pcm_get_data(substream);
 
-        dmaengine_terminate_all(rtd->dma_chan);
+        snd_dmaengine_pcm_close(substream);
+        kfree(dma_data);
+        return 0;
 }
 
 static int ep93xx_pcm_hw_params(struct snd_pcm_substream *substream,
                                 struct snd_pcm_hw_params *params)
 {
-        struct snd_pcm_runtime *runtime = substream->runtime;
-        struct ep93xx_runtime_data *rtd = runtime->private_data;
-
         snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer);
 
-        rtd->periods = params_periods(params);
-        rtd->period_bytes = params_period_bytes(params);
         return 0;
 }
 
@@ -187,41 +118,6 @@ static int ep93xx_pcm_hw_free(struct snd_pcm_substream *substream)
         return 0;
 }
 
-static int ep93xx_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
-{
-        int ret;
-
-        ret = 0;
-        switch (cmd) {
-        case SNDRV_PCM_TRIGGER_START:
-        case SNDRV_PCM_TRIGGER_RESUME:
-        case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
-                ret = ep93xx_pcm_dma_submit(substream);
-                break;
-
-        case SNDRV_PCM_TRIGGER_STOP:
-        case SNDRV_PCM_TRIGGER_SUSPEND:
-        case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
-                ep93xx_pcm_dma_flush(substream);
-                break;
-
-        default:
-                ret = -EINVAL;
-                break;
-        }
-
-        return ret;
-}
-
-static snd_pcm_uframes_t ep93xx_pcm_pointer(struct snd_pcm_substream *substream)
-{
-        struct snd_pcm_runtime *runtime = substream->runtime;
-        struct ep93xx_runtime_data *rtd = substream->runtime->private_data;
-
-        /* FIXME: implement this with sub-period granularity */
-        return bytes_to_frames(runtime, rtd->pointer_bytes);
-}
-
 static int ep93xx_pcm_mmap(struct snd_pcm_substream *substream,
                            struct vm_area_struct *vma)
 {
@@ -239,8 +135,8 @@ static struct snd_pcm_ops ep93xx_pcm_ops = {
         .ioctl          = snd_pcm_lib_ioctl,
         .hw_params      = ep93xx_pcm_hw_params,
         .hw_free        = ep93xx_pcm_hw_free,
-        .trigger        = ep93xx_pcm_trigger,
-        .pointer        = ep93xx_pcm_pointer,
+        .trigger        = snd_dmaengine_pcm_trigger,
+        .pointer        = snd_dmaengine_pcm_pointer,
         .mmap           = ep93xx_pcm_mmap,
 };