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_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 */
  21struct 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 */
  50struct 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 */
  76static inline struct psc_dma_stream *
  77to_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
  84int mpc5200_audio_dma_create(struct platform_device *op);
  85int mpc5200_audio_dma_destroy(struct platform_device *op);
  86
  87#endif /* __SOUND_SOC_FSL_MPC5200_DMA_H__ */
  88