diff options
Diffstat (limited to 'sound/soc/fsl/mpc5200_dma.h')
| -rw-r--r-- | sound/soc/fsl/mpc5200_dma.h | 81 |
1 files changed, 81 insertions, 0 deletions
diff --git a/sound/soc/fsl/mpc5200_dma.h b/sound/soc/fsl/mpc5200_dma.h new file mode 100644 index 0000000..9a19e8a --- /dev/null +++ b/sound/soc/fsl/mpc5200_dma.h @@ -0,0 +1,81 @@ +/* + * Freescale MPC5200 Audio DMA driver + */ + +#ifndef __SOUND_SOC_FSL_MPC5200_DMA_H__ +#define __SOUND_SOC_FSL_MPC5200_DMA_H__ + +/** + * psc_i2s_stream - Data specific to a single stream (playback or capture) + * @active: flag indicating if the stream is active + * @psc_i2s: pointer back to parent psc_i2s data structure + * @bcom_task: bestcomm task structure + * @irq: irq number for bestcomm task + * @period_start: physical address of start of DMA region + * @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 + */ +struct psc_i2s_stream { + int active; + struct psc_i2s *psc_i2s; + struct bcom_task *bcom_task; + int irq; + struct snd_pcm_substream *stream; + dma_addr_t period_start; + dma_addr_t period_end; + dma_addr_t period_next_pt; + dma_addr_t period_current_pt; + int period_bytes; +}; + +/** + * psc_i2s - 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_i2s { + char name[32]; + struct mpc52xx_psc __iomem *psc_regs; + struct mpc52xx_psc_fifo __iomem *fifo_regs; + unsigned int irq; + struct device *dev; + struct snd_soc_dai dai; + spinlock_t lock; + u32 sicr; + + /* per-stream data */ + struct psc_i2s_stream playback; + struct psc_i2s_stream capture; + + /* Statistics */ + struct { + int overrun_count; + int underrun_count; + } stats; +}; + + +int psc_i2s_startup(struct snd_pcm_substream *substream, + struct snd_soc_dai *dai); + +int psc_i2s_hw_free(struct snd_pcm_substream *substream, + struct snd_soc_dai *dai); + +void psc_i2s_shutdown(struct snd_pcm_substream *substream, + struct snd_soc_dai *dai); + +int psc_i2s_trigger(struct snd_pcm_substream *substream, int cmd, + struct snd_soc_dai *dai); + +extern struct snd_soc_platform psc_i2s_pcm_soc_platform; + +#endif /* __SOUND_SOC_FSL_MPC5200_DMA_H__ */ |
