diff options
Diffstat (limited to 'sound/soc/fsl/mpc5200_dma.h')
| -rw-r--r-- | sound/soc/fsl/mpc5200_dma.h | 87 |
1 files changed, 87 insertions, 0 deletions
diff --git a/sound/soc/fsl/mpc5200_dma.h b/sound/soc/fsl/mpc5200_dma.h new file mode 100644 index 000000000..dff253fde --- /dev/null +++ b/sound/soc/fsl/mpc5200_dma.h @@ -0,0 +1,87 @@ +/* + * Freescale MPC5200 Audio DMA driver + */ + +#ifndef __SOUND_SOC_FSL_MPC5200_DMA_H__ +#define __SOUND_SOC_FSL_MPC5200_DMA_H__ + +#define PSC_STREAM_NAME_LEN 32 + +/** + * psc_ac97_stream - Data specific to a single stream (playback or capture) + * @active: flag indicating if the stream is active + * @psc_dma: pointer back to parent psc_dma data structure + * @bcom_task: bestcomm task structure + * @irq: irq number for bestcomm task + * @period_end: physical address of end of DMA region + * @period_next_pt: physical address of next DMA buffer to enqueue + * @period_bytes: size of DMA period in bytes + * @ac97_slot_bits: Enable bits for turning on the correct AC97 slot + */ +struct psc_dma_stream { + struct snd_pcm_runtime *runtime; + int active; + struct psc_dma *psc_dma; + struct bcom_task *bcom_task; + int irq; + struct snd_pcm_substream *stream; + int period_next; + int period_current; + int period_bytes; + int period_count; + + /* AC97 state */ + u32 ac97_slot_bits; +}; + +/** + * psc_dma - Private driver data + * @name: short name for this device ("PSC0", "PSC1", etc) + * @psc_regs: pointer to the PSC's registers + * @fifo_regs: pointer to the PSC's FIFO registers + * @irq: IRQ of this PSC + * @dev: struct device pointer + * @dai: the CPU DAI for this device + * @sicr: Base value used in serial interface control register; mode is ORed + * with this value. + * @playback: Playback stream context data + * @capture: Capture stream context data + */ +struct psc_dma { + char name[32]; + struct mpc52xx_psc __iomem *psc_regs; + struct mpc52xx_psc_fifo __iomem *fifo_regs; + unsigned int irq; + struct device *dev; + spinlock_t lock; + struct mutex mutex; + u32 sicr; + uint sysclk; + int imr; + int id; + unsigned int slots; + + /* per-stream data */ + struct psc_dma_stream playback; + struct psc_dma_stream capture; + + /* Statistics */ + struct { + unsigned long overrun_count; + unsigned long underrun_count; + } stats; +}; + +/* Utility for retrieving psc_dma_stream structure from a substream */ +static inline struct psc_dma_stream * +to_psc_dma_stream(struct snd_pcm_substream *substream, struct psc_dma *psc_dma) +{ + if (substream->pstr->stream == SNDRV_PCM_STREAM_CAPTURE) + return &psc_dma->capture; + return &psc_dma->playback; +} + +int mpc5200_audio_dma_create(struct platform_device *op); +int mpc5200_audio_dma_destroy(struct platform_device *op); + +#endif /* __SOUND_SOC_FSL_MPC5200_DMA_H__ */ |