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awilliam
GitHub Repository: awilliam/linux-vfio
 Path: blob/master/sound/soc/fsl/mpc5200_dma.h
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/*

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 * Freescale MPC5200 Audio DMA driver

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 */

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#ifndef __SOUND_SOC_FSL_MPC5200_DMA_H__

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#define __SOUND_SOC_FSL_MPC5200_DMA_H__

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#define PSC_STREAM_NAME_LEN 32

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/**

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 * psc_ac97_stream - Data specific to a single stream (playback or capture)

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 * @active:		flag indicating if the stream is active

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 * @psc_dma:		pointer back to parent psc_dma data structure

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 * @bcom_task:		bestcomm task structure

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 * @irq:		irq number for bestcomm task

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 * @period_end:		physical address of end of DMA region

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 * @period_next_pt:	physical address of next DMA buffer to enqueue

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 * @period_bytes:	size of DMA period in bytes

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 * @ac97_slot_bits:	Enable bits for turning on the correct AC97 slot

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 */

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struct psc_dma_stream {

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	struct snd_pcm_runtime *runtime;

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	int active;

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	struct psc_dma *psc_dma;

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	struct bcom_task *bcom_task;

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	int irq;

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	struct snd_pcm_substream *stream;

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	int period_next;

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	int period_current;

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	int period_bytes;

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	int period_count;

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	/* AC97 state */

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	u32 ac97_slot_bits;

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};

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/**

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 * psc_dma - Private driver data

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 * @name: short name for this device ("PSC0", "PSC1", etc)

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 * @psc_regs: pointer to the PSC's registers

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 * @fifo_regs: pointer to the PSC's FIFO registers

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 * @irq: IRQ of this PSC

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 * @dev: struct device pointer

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 * @dai: the CPU DAI for this device

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 * @sicr: Base value used in serial interface control register; mode is ORed

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 *        with this value.

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 * @playback: Playback stream context data

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 * @capture: Capture stream context data

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 */

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struct psc_dma {

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	char name[32];

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	struct mpc52xx_psc __iomem *psc_regs;

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	struct mpc52xx_psc_fifo __iomem *fifo_regs;

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	unsigned int irq;

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	struct device *dev;

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	spinlock_t lock;

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	struct mutex mutex;

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	u32 sicr;

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	uint sysclk;

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	int imr;

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	int id;

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	unsigned int slots;

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	/* per-stream data */

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	struct psc_dma_stream playback;

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	struct psc_dma_stream capture;

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	/* Statistics */

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	struct {

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		unsigned long overrun_count;

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		unsigned long underrun_count;

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	} stats;

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};

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/* Utility for retrieving psc_dma_stream structure from a substream */

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static inline struct psc_dma_stream *

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to_psc_dma_stream(struct snd_pcm_substream *substream, struct psc_dma *psc_dma)

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{

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	if (substream->pstr->stream == SNDRV_PCM_STREAM_CAPTURE)

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		return &psc_dma->capture;

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	return &psc_dma->playback;

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}

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#endif /* __SOUND_SOC_FSL_MPC5200_DMA_H__ */

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