LXR linux/sound/soc/fsl/mpc5200

   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 */
  21struct 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 */
  51struct 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
  76int mpc5200_audio_dma_create(struct of_device *op);
  77int mpc5200_audio_dma_destroy(struct of_device *op);
  78
  79extern struct snd_soc_platform mpc5200_audio_dma_platform;
  80
  81#endif /* __SOUND_SOC_FSL_MPC5200_DMA_H__ */
  82