diff options
Diffstat (limited to 'sound/arm/pxa2xx-pcm-lib.c')
| -rw-r--r-- | sound/arm/pxa2xx-pcm-lib.c | 195 |
1 files changed, 195 insertions, 0 deletions
diff --git a/sound/arm/pxa2xx-pcm-lib.c b/sound/arm/pxa2xx-pcm-lib.c new file mode 100644 index 000000000..0a48805e5 --- /dev/null +++ b/sound/arm/pxa2xx-pcm-lib.c @@ -0,0 +1,195 @@ +// SPDX-License-Identifier: GPL-2.0-only + +#include <linux/slab.h> +#include <linux/module.h> +#include <linux/dma-mapping.h> +#include <linux/dmaengine.h> +#include <linux/dma/pxa-dma.h> + +#include <sound/core.h> +#include <sound/pcm.h> +#include <sound/pcm_params.h> +#include <sound/pxa2xx-lib.h> +#include <sound/dmaengine_pcm.h> + +static const struct snd_pcm_hardware pxa2xx_pcm_hardware = { + .info = SNDRV_PCM_INFO_MMAP | + SNDRV_PCM_INFO_MMAP_VALID | + SNDRV_PCM_INFO_INTERLEAVED | + SNDRV_PCM_INFO_PAUSE | + SNDRV_PCM_INFO_RESUME, + .formats = SNDRV_PCM_FMTBIT_S16_LE | + SNDRV_PCM_FMTBIT_S24_LE | + SNDRV_PCM_FMTBIT_S32_LE, + .period_bytes_min = 32, + .period_bytes_max = 8192 - 32, + .periods_min = 1, + .periods_max = 256, + .buffer_bytes_max = 128 * 1024, + .fifo_size = 32, +}; + +int pxa2xx_pcm_hw_params(struct snd_pcm_substream *substream, + struct snd_pcm_hw_params *params) +{ + struct dma_chan *chan = snd_dmaengine_pcm_get_chan(substream); + struct snd_soc_pcm_runtime *rtd = substream->private_data; + struct snd_dmaengine_dai_dma_data *dma_params; + struct dma_slave_config config; + int ret; + + dma_params = snd_soc_dai_get_dma_data(asoc_rtd_to_cpu(rtd, 0), substream); + if (!dma_params) + return 0; + + ret = snd_hwparams_to_dma_slave_config(substream, params, &config); + if (ret) + return ret; + + snd_dmaengine_pcm_set_config_from_dai_data(substream, + snd_soc_dai_get_dma_data(asoc_rtd_to_cpu(rtd, 0), substream), + &config); + + ret = dmaengine_slave_config(chan, &config); + if (ret) + return ret; + + return 0; +} +EXPORT_SYMBOL(pxa2xx_pcm_hw_params); + +int pxa2xx_pcm_trigger(struct snd_pcm_substream *substream, int cmd) +{ + return snd_dmaengine_pcm_trigger(substream, cmd); +} +EXPORT_SYMBOL(pxa2xx_pcm_trigger); + +snd_pcm_uframes_t +pxa2xx_pcm_pointer(struct snd_pcm_substream *substream) +{ + return snd_dmaengine_pcm_pointer(substream); +} +EXPORT_SYMBOL(pxa2xx_pcm_pointer); + +int pxa2xx_pcm_prepare(struct snd_pcm_substream *substream) +{ + return 0; +} +EXPORT_SYMBOL(pxa2xx_pcm_prepare); + +int pxa2xx_pcm_open(struct snd_pcm_substream *substream) +{ + struct snd_soc_pcm_runtime *rtd = substream->private_data; + struct snd_pcm_runtime *runtime = substream->runtime; + struct snd_dmaengine_dai_dma_data *dma_params; + int ret; + + runtime->hw = pxa2xx_pcm_hardware; + + dma_params = snd_soc_dai_get_dma_data(asoc_rtd_to_cpu(rtd, 0), substream); + if (!dma_params) + return 0; + + /* + * For mysterious reasons (and despite what the manual says) + * playback samples are lost if the DMA count is not a multiple + * of the DMA burst size. Let's add a rule to enforce that. + */ + ret = snd_pcm_hw_constraint_step(runtime, 0, + SNDRV_PCM_HW_PARAM_PERIOD_BYTES, 32); + if (ret) + return ret; + + ret = snd_pcm_hw_constraint_step(runtime, 0, + SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 32); + if (ret) + return ret; + + ret = snd_pcm_hw_constraint_integer(runtime, + SNDRV_PCM_HW_PARAM_PERIODS); + if (ret < 0) + return ret; + + return snd_dmaengine_pcm_open( + substream, dma_request_slave_channel(asoc_rtd_to_cpu(rtd, 0)->dev, + dma_params->chan_name)); +} +EXPORT_SYMBOL(pxa2xx_pcm_open); + +int pxa2xx_pcm_close(struct snd_pcm_substream *substream) +{ + return snd_dmaengine_pcm_close_release_chan(substream); +} +EXPORT_SYMBOL(pxa2xx_pcm_close); + +int pxa2xx_pcm_preallocate_dma_buffer(struct snd_pcm *pcm) +{ + size_t size = pxa2xx_pcm_hardware.buffer_bytes_max; + + return snd_pcm_set_fixed_buffer_all(pcm, SNDRV_DMA_TYPE_DEV_WC, + pcm->card->dev, size); +} +EXPORT_SYMBOL(pxa2xx_pcm_preallocate_dma_buffer); + +int pxa2xx_soc_pcm_new(struct snd_soc_component *component, + struct snd_soc_pcm_runtime *rtd) +{ + struct snd_card *card = rtd->card->snd_card; + struct snd_pcm *pcm = rtd->pcm; + int ret; + + ret = dma_coerce_mask_and_coherent(card->dev, DMA_BIT_MASK(32)); + if (ret) + return ret; + + return pxa2xx_pcm_preallocate_dma_buffer(pcm); +} +EXPORT_SYMBOL(pxa2xx_soc_pcm_new); + +int pxa2xx_soc_pcm_open(struct snd_soc_component *component, + struct snd_pcm_substream *substream) +{ + return pxa2xx_pcm_open(substream); +} +EXPORT_SYMBOL(pxa2xx_soc_pcm_open); + +int pxa2xx_soc_pcm_close(struct snd_soc_component *component, + struct snd_pcm_substream *substream) +{ + return pxa2xx_pcm_close(substream); +} +EXPORT_SYMBOL(pxa2xx_soc_pcm_close); + +int pxa2xx_soc_pcm_hw_params(struct snd_soc_component *component, + struct snd_pcm_substream *substream, + struct snd_pcm_hw_params *params) +{ + return pxa2xx_pcm_hw_params(substream, params); +} +EXPORT_SYMBOL(pxa2xx_soc_pcm_hw_params); + +int pxa2xx_soc_pcm_prepare(struct snd_soc_component *component, + struct snd_pcm_substream *substream) +{ + return pxa2xx_pcm_prepare(substream); +} +EXPORT_SYMBOL(pxa2xx_soc_pcm_prepare); + +int pxa2xx_soc_pcm_trigger(struct snd_soc_component *component, + struct snd_pcm_substream *substream, int cmd) +{ + return pxa2xx_pcm_trigger(substream, cmd); +} +EXPORT_SYMBOL(pxa2xx_soc_pcm_trigger); + +snd_pcm_uframes_t +pxa2xx_soc_pcm_pointer(struct snd_soc_component *component, + struct snd_pcm_substream *substream) +{ + return pxa2xx_pcm_pointer(substream); +} +EXPORT_SYMBOL(pxa2xx_soc_pcm_pointer); + +MODULE_AUTHOR("Nicolas Pitre"); +MODULE_DESCRIPTION("Intel PXA2xx sound library"); +MODULE_LICENSE("GPL"); |