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_start:       physical address of start of DMA region
  17  * @period_end:         physical address of end of DMA region
  18  * @period_next_pt:     physical address of next DMA buffer to enqueue
  19  * @period_bytes:       size of DMA period in bytes
  20  */
  21 struct psc_dma_stream {
  22         struct snd_pcm_runtime *runtime;
  23         snd_pcm_uframes_t appl_ptr;
  24
  25         int active;
  26         struct psc_dma *psc_dma;
  27         struct bcom_task *bcom_task;
  28         int irq;
  29         struct snd_pcm_substream *stream;
  30         dma_addr_t period_start;
  31         dma_addr_t period_end;
  32         dma_addr_t period_next_pt;
  33         dma_addr_t period_current_pt;
  34         int period_bytes;
  35         int period_size;
  36 };
  37
  38 /**
  39  * psc_dma - Private driver data
  40  * @name: short name for this device ("PSC0", "PSC1", etc)
  41  * @psc_regs: pointer to the PSC's registers
  42  * @fifo_regs: pointer to the PSC's FIFO registers
  43  * @irq: IRQ of this PSC
  44  * @dev: struct device pointer
  45  * @dai: the CPU DAI for this device
  46  * @sicr: Base value used in serial interface control register; mode is ORed
  47  *        with this value.
  48  * @playback: Playback stream context data
  49  * @capture: Capture stream context data
  50  */
  51 struct psc_dma {
  52         char name[32];
  53         struct mpc52xx_psc __iomem *psc_regs;
  54         struct mpc52xx_psc_fifo __iomem *fifo_regs;
  55         unsigned int irq;
  56         struct device *dev;
  57         spinlock_t lock;
  58         struct mutex mutex;
  59         u32 sicr;
  60         uint sysclk;
  61         int imr;
  62         int id;
  63         unsigned int slots;
  64
  65         /* per-stream data */
  66         struct psc_dma_stream playback;
  67         struct psc_dma_stream capture;
  68
  69         /* Statistics */
  70         struct {
  71                 unsigned long overrun_count;
  72                 unsigned long underrun_count;
  73         } stats;
  74 };
  75
  76 int mpc5200_audio_dma_create(struct of_device *op);
  77 int mpc5200_audio_dma_destroy(struct of_device *op);
  78
  79 extern struct snd_soc_platform mpc5200_audio_dma_platform;
  80
  81 #endif /* __SOUND_SOC_FSL_MPC5200_DMA_H__ */