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mpc5200_dma.h
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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 
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 
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 platform_device *op);
85 int mpc5200_audio_dma_destroy(struct platform_device *op);
86 
87 #endif /* __SOUND_SOC_FSL_MPC5200_DMA_H__ */
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