sound/soc/fsl/mpc5200_dma.h

   1 /*
   2  * Freescale MPC5200 Audio DMA driver
   3  */
   4
   5 #ifndef __SOUND_SOC_FSL_MPC5200_DMA_H__
   6 #define __SOUND_SOC_FSL_MPC5200_DMA_H__
   7
   8 #define PSC_STREAM_NAME_LEN 32
   9
  10 /**
  11  * psc_ac97_stream - Data specific to a single stream (playback or capture)
  12  * @active:             flag indicating if the stream is active
  13  * @psc_dma:            pointer back to parent psc_dma data structure
  14  * @bcom_task:          bestcomm task structure
  15  * @irq:                irq number for bestcomm task
  16  * @period_end:         physical address of end of DMA region
  17  * @period_next_pt:     physical address of next DMA buffer to enqueue
  18  * @period_bytes:       size of DMA period in bytes
  19  * @ac97_slot_bits:     Enable bits for turning on the correct AC97 slot
  20  */
  21 struct psc_dma_stream {
  22         struct snd_pcm_runtime *runtime;
  23         int active;
  24         struct psc_dma *psc_dma;
  25         struct bcom_task *bcom_task;
  26         int irq;
  27         struct snd_pcm_substream *stream;
  28         int period_next;
  29         int period_current;
  30         int period_bytes;
  31         int period_count;
  32
  33         /* AC97 state */
  34         u32 ac97_slot_bits;
  35 };
  36
  37 /**
  38  * psc_dma - Private driver data
  39  * @name: short name for this device ("PSC0", "PSC1", etc)
  40  * @psc_regs: pointer to the PSC's registers
  41  * @fifo_regs: pointer to the PSC's FIFO registers
  42  * @irq: IRQ of this PSC
  43  * @dev: struct device pointer
  44  * @dai: the CPU DAI for this device
  45  * @sicr: Base value used in serial interface control register; mode is ORed
  46  *        with this value.
  47  * @playback: Playback stream context data
  48  * @capture: Capture stream context data
  49  */
  50 struct psc_dma {
  51         char name[32];
  52         struct mpc52xx_psc __iomem *psc_regs;
  53         struct mpc52xx_psc_fifo __iomem *fifo_regs;
  54         unsigned int irq;
  55         struct device *dev;
  56         spinlock_t lock;
  57         struct mutex mutex;
  58         u32 sicr;
  59         uint sysclk;
  60         int imr;
  61         int id;
  62         unsigned int slots;
  63
  64         /* per-stream data */
  65         struct psc_dma_stream playback;
  66         struct psc_dma_stream capture;
  67
  68         /* Statistics */
  69         struct {
  70                 unsigned long overrun_count;
  71                 unsigned long underrun_count;
  72         } stats;
  73 };
  74
  75 /* Utility for retrieving psc_dma_stream structure from a substream */
  76 static inline struct psc_dma_stream *
  77 to_psc_dma_stream(struct snd_pcm_substream *substream, struct psc_dma *psc_dma)
  78 {
  79         if (substream->pstr->stream == SNDRV_PCM_STREAM_CAPTURE)
  80                 return &psc_dma->capture;
  81         return &psc_dma->playback;
  82 }
  83
  84 int mpc5200_audio_dma_create(struct of_device *op);
  85 int mpc5200_audio_dma_destroy(struct of_device *op);
  86
  87 extern struct snd_soc_platform mpc5200_audio_dma_platform;
  88
  89 #endif /* __SOUND_SOC_FSL_MPC5200_DMA_H__ */