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 /**
   9  * psc_dma_stream - Data specific to a single stream (playback or capture)
  10  * @active:             flag indicating if the stream is active
  11  * @psc_dma:            pointer back to parent psc_dma data structure
  12  * @bcom_task:          bestcomm task structure
  13  * @irq:                irq number for bestcomm task
  14  * @period_start:       physical address of start of DMA region
  15  * @period_end:         physical address of end of DMA region
  16  * @period_next_pt:     physical address of next DMA buffer to enqueue
  17  * @period_bytes:       size of DMA period in bytes
  18  */
  19 struct psc_dma_stream {
  20         int active;
  21         struct psc_dma *psc_dma;
  22         struct bcom_task *bcom_task;
  23         int irq;
  24         struct snd_pcm_substream *stream;
  25         dma_addr_t period_start;
  26         dma_addr_t period_end;
  27         dma_addr_t period_next_pt;
  28         dma_addr_t period_current_pt;
  29         int period_bytes;
  30 };
  31
  32 /**
  33  * psc_dma - Private driver data
  34  * @name: short name for this device ("PSC0", "PSC1", etc)
  35  * @psc_regs: pointer to the PSC's registers
  36  * @fifo_regs: pointer to the PSC's FIFO registers
  37  * @irq: IRQ of this PSC
  38  * @dev: struct device pointer
  39  * @dai: the CPU DAI for this device
  40  * @sicr: Base value used in serial interface control register; mode is ORed
  41  *        with this value.
  42  * @playback: Playback stream context data
  43  * @capture: Capture stream context data
  44  */
  45 struct psc_dma {
  46         char name[32];
  47         struct mpc52xx_psc __iomem *psc_regs;
  48         struct mpc52xx_psc_fifo __iomem *fifo_regs;
  49         unsigned int irq;
  50         struct device *dev;
  51         struct snd_soc_dai dai;
  52         spinlock_t lock;
  53         u32 sicr;
  54
  55         /* per-stream data */
  56         struct psc_dma_stream playback;
  57         struct psc_dma_stream capture;
  58
  59         /* Statistics */
  60         struct {
  61                 int overrun_count;
  62                 int underrun_count;
  63         } stats;
  64 };
  65
  66
  67 int psc_dma_startup(struct snd_pcm_substream *substream,
  68                            struct snd_soc_dai *dai);
  69
  70 int psc_dma_hw_free(struct snd_pcm_substream *substream,
  71                            struct snd_soc_dai *dai);
  72
  73 void psc_dma_shutdown(struct snd_pcm_substream *substream,
  74                              struct snd_soc_dai *dai);
  75
  76 int psc_dma_trigger(struct snd_pcm_substream *substream, int cmd,
  77                            struct snd_soc_dai *dai);
  78
  79 extern struct snd_soc_platform psc_dma_pcm_soc_platform;
  80
  81 #endif /* __SOUND_SOC_FSL_MPC5200_DMA_H__ */