82 lines
2.2 KiB
C
82 lines
2.2 KiB
C
![]() |
/*
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* Freescale MPC5200 Audio DMA driver
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*/
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#ifndef __SOUND_SOC_FSL_MPC5200_DMA_H__
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#define __SOUND_SOC_FSL_MPC5200_DMA_H__
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/**
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* psc_i2s_stream - Data specific to a single stream (playback or capture)
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* @active: flag indicating if the stream is active
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* @psc_i2s: pointer back to parent psc_i2s data structure
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* @bcom_task: bestcomm task structure
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* @irq: irq number for bestcomm task
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* @period_start: physical address of start of DMA region
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* @period_end: physical address of end of DMA region
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* @period_next_pt: physical address of next DMA buffer to enqueue
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* @period_bytes: size of DMA period in bytes
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*/
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struct psc_i2s_stream {
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int active;
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struct psc_i2s *psc_i2s;
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struct bcom_task *bcom_task;
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int irq;
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struct snd_pcm_substream *stream;
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dma_addr_t period_start;
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dma_addr_t period_end;
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dma_addr_t period_next_pt;
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dma_addr_t period_current_pt;
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int period_bytes;
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};
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/**
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* psc_i2s - Private driver data
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* @name: short name for this device ("PSC0", "PSC1", etc)
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* @psc_regs: pointer to the PSC's registers
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* @fifo_regs: pointer to the PSC's FIFO registers
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* @irq: IRQ of this PSC
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* @dev: struct device pointer
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* @dai: the CPU DAI for this device
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* @sicr: Base value used in serial interface control register; mode is ORed
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* with this value.
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* @playback: Playback stream context data
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* @capture: Capture stream context data
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*/
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struct psc_i2s {
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char name[32];
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struct mpc52xx_psc __iomem *psc_regs;
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struct mpc52xx_psc_fifo __iomem *fifo_regs;
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unsigned int irq;
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struct device *dev;
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struct snd_soc_dai dai;
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spinlock_t lock;
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u32 sicr;
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/* per-stream data */
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struct psc_i2s_stream playback;
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struct psc_i2s_stream capture;
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/* Statistics */
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struct {
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int overrun_count;
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int underrun_count;
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} stats;
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};
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int psc_i2s_startup(struct snd_pcm_substream *substream,
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struct snd_soc_dai *dai);
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int psc_i2s_hw_free(struct snd_pcm_substream *substream,
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struct snd_soc_dai *dai);
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void psc_i2s_shutdown(struct snd_pcm_substream *substream,
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struct snd_soc_dai *dai);
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int psc_i2s_trigger(struct snd_pcm_substream *substream, int cmd,
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struct snd_soc_dai *dai);
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extern struct snd_soc_platform psc_i2s_pcm_soc_platform;
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#endif /* __SOUND_SOC_FSL_MPC5200_DMA_H__ */
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