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 */ 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 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 */ 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__ */ 88