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 * Freescale MPC5200 Audio DMA driver

#ifndef __SOUND_SOC_FSL_MPC5200_DMA_H__
#define __SOUND_SOC_FSL_MPC5200_DMA_H__


 * 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
00021 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
00050 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;

#endif /* __SOUND_SOC_FSL_MPC5200_DMA_H__ */

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