ASoC: tegra: 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: Stephen Warren <swarren@nvidia.com>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>

2 files changed, 10 insertions, 163 deletions

diff --git a/sound/soc/tegra/Kconfig b/sound/soc/tegra/Kconfig
index dbc27ce1d4de..b1c9d573da05 100644
--- a/sound/soc/tegra/Kconfig
+++ b/sound/soc/tegra/Kconfig
@@ -2,7 +2,7 @@ config SND_SOC_TEGRA
         tristate "SoC Audio for the Tegra System-on-Chip"
         depends on ARCH_TEGRA && TEGRA20_APB_DMA
         select REGMAP_MMIO
-        select SND_SOC_DMAENGINE_PCM if TEGRA20_APB_DMA
+        select SND_SOC_GENERIC_DMAENGINE_PCM if TEGRA20_APB_DMA
         help
           Say Y or M here if you want support for SoC audio on Tegra.
 
diff --git a/sound/soc/tegra/tegra_pcm.c b/sound/soc/tegra/tegra_pcm.c
index f9f247c64c6d..f056f632557c 100644
--- a/sound/soc/tegra/tegra_pcm.c
+++ b/sound/soc/tegra/tegra_pcm.c
@@ -29,9 +29,7 @@
  *
  */
 
-#include <linux/dma-mapping.h>
 #include <linux/module.h>
-#include <linux/slab.h>
 #include <sound/core.h>
 #include <sound/pcm.h>
 #include <sound/pcm_params.h>
@@ -55,175 +53,24 @@ static const struct snd_pcm_hardware tegra_pcm_hardware = {
         .fifo_size              = 4,
 };
 
-static int tegra_pcm_open(struct snd_pcm_substream *substream)
-{
-        struct snd_soc_pcm_runtime *rtd = substream->private_data;
-        struct device *dev = rtd->platform->dev;
-        int ret;
-
-        /* Set HW params now that initialization is complete */
-        snd_soc_set_runtime_hwparams(substream, &tegra_pcm_hardware);
-
-        ret = snd_dmaengine_pcm_open_request_chan(substream, NULL, NULL);
-        if (ret) {
-                dev_err(dev, "dmaengine pcm open failed with err %d\n", ret);
-                return ret;
-        }
-
-        return 0;
-}
-
-static int tegra_pcm_hw_params(struct snd_pcm_substream *substream,
-                                struct snd_pcm_hw_params *params)
-{
-        struct snd_soc_pcm_runtime *rtd = substream->private_data;
-        struct device *dev = rtd->platform->dev;
-        struct dma_chan *chan = snd_dmaengine_pcm_get_chan(substream);
-        struct dma_slave_config slave_config;
-        int ret;
-
-        ret = snd_hwparams_to_dma_slave_config(substream, params,
-                                                &slave_config);
-        if (ret) {
-                dev_err(dev, "hw params config failed with err %d\n", ret);
-                return ret;
-        }
-
-        snd_dmaengine_pcm_set_config_from_dai_data(substream,
-                        snd_soc_dai_get_dma_data(rtd->cpu_dai, substream),
-                        &slave_config);
-
-        ret = dmaengine_slave_config(chan, &slave_config);
-        if (ret < 0) {
-                dev_err(dev, "dma slave config failed with err %d\n", ret);
-                return ret;
-        }
-
-        snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer);
-        return 0;
-}
-
-static int tegra_pcm_hw_free(struct snd_pcm_substream *substream)
-{
-        snd_pcm_set_runtime_buffer(substream, NULL);
-        return 0;
-}
-
-static int tegra_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 tegra_pcm_ops = {
-        .open           = tegra_pcm_open,
-        .close          = snd_dmaengine_pcm_close_release_chan,
-        .ioctl          = snd_pcm_lib_ioctl,
-        .hw_params      = tegra_pcm_hw_params,
-        .hw_free        = tegra_pcm_hw_free,
-        .trigger        = snd_dmaengine_pcm_trigger,
-        .pointer        = snd_dmaengine_pcm_pointer,
-        .mmap           = tegra_pcm_mmap,
-};
-
-static int tegra_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 = tegra_pcm_hardware.buffer_bytes_max;
-
-        buf->area = dma_alloc_writecombine(pcm->card->dev, size,
-                                                &buf->addr, GFP_KERNEL);
-        if (!buf->area)
-                return -ENOMEM;
-
-        buf->dev.type = SNDRV_DMA_TYPE_DEV;
-        buf->dev.dev = pcm->card->dev;
-        buf->private_data = NULL;
-        buf->bytes = size;
-
-        return 0;
-}
-
-static void tegra_pcm_deallocate_dma_buffer(struct snd_pcm *pcm, int stream)
-{
-        struct snd_pcm_substream *substream;
-        struct snd_dma_buffer *buf;
-
-        substream = pcm->streams[stream].substream;
-        if (!substream)
-                return;
-
-        buf = &substream->dma_buffer;
-        if (!buf->area)
-                return;
-
-        dma_free_writecombine(pcm->card->dev, buf->bytes,
-                                buf->area, buf->addr);
-        buf->area = NULL;
-}
-
-static u64 tegra_dma_mask = DMA_BIT_MASK(32);
-
-static int tegra_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 = &tegra_dma_mask;
-        if (!card->dev->coherent_dma_mask)
-                card->dev->coherent_dma_mask = DMA_BIT_MASK(32);
-
-        if (pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream) {
-                ret = tegra_pcm_preallocate_dma_buffer(pcm,
-                                                SNDRV_PCM_STREAM_PLAYBACK);
-                if (ret)
-                        goto err;
-        }
-
-        if (pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream) {
-                ret = tegra_pcm_preallocate_dma_buffer(pcm,
-                                                SNDRV_PCM_STREAM_CAPTURE);
-                if (ret)
-                        goto err_free_play;
-        }
-
-        return 0;
-
-err_free_play:
-        tegra_pcm_deallocate_dma_buffer(pcm, SNDRV_PCM_STREAM_PLAYBACK);
-err:
-        return ret;
-}
-
-static void tegra_pcm_free(struct snd_pcm *pcm)
-{
-        tegra_pcm_deallocate_dma_buffer(pcm, SNDRV_PCM_STREAM_CAPTURE);
-        tegra_pcm_deallocate_dma_buffer(pcm, SNDRV_PCM_STREAM_PLAYBACK);
-}
-
-static struct snd_soc_platform_driver tegra_pcm_platform = {
-        .ops            = &tegra_pcm_ops,
-        .pcm_new        = tegra_pcm_new,
-        .pcm_free       = tegra_pcm_free,
+static const struct snd_dmaengine_pcm_config tegra_dmaengine_pcm_config = {
+        .pcm_hardware = &tegra_pcm_hardware,
+        .prepare_slave_config = snd_dmaengine_pcm_prepare_slave_config,
+        .compat_filter_fn = NULL,
+        .prealloc_buffer_size = PAGE_SIZE * 8,
 };
 
 int tegra_pcm_platform_register(struct device *dev)
 {
-        return snd_soc_register_platform(dev, &tegra_pcm_platform);
+        return snd_dmaengine_pcm_register(dev, &tegra_dmaengine_pcm_config,
+                        SND_DMAENGINE_PCM_FLAG_NO_DT |
+                        SND_DMAENGINE_PCM_FLAG_COMPAT);
 }
 EXPORT_SYMBOL_GPL(tegra_pcm_platform_register);
 
 void tegra_pcm_platform_unregister(struct device *dev)
 {
-        snd_soc_unregister_platform(dev);
+        return snd_dmaengine_pcm_unregister(dev);
 }
 EXPORT_SYMBOL_GPL(tegra_pcm_platform_unregister);