sound/soc/fsl/mpc5200_dma.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 /*
   3  * Freescale MPC5200 Audio DMA driver
   4  */
   5
   6 #ifndef __SOUND_SOC_FSL_MPC5200_DMA_H__
   7 #define __SOUND_SOC_FSL_MPC5200_DMA_H__
   8
   9 #define PSC_STREAM_NAME_LEN 32
  10
  11 /**
  12  * psc_ac97_stream - Data specific to a single stream (playback or capture)
  13  * @active:             flag indicating if the stream is active
  14  * @psc_dma:            pointer back to parent psc_dma data structure
  15  * @bcom_task:          bestcomm task structure
  16  * @irq:                irq number for bestcomm task
  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  * @ac97_slot_bits:     Enable bits for turning on the correct AC97 slot
  21  */
  22 struct psc_dma_stream {
  23         struct snd_pcm_runtime *runtime;
  24         int active;
  25         struct psc_dma *psc_dma;
  26         struct bcom_task *bcom_task;
  27         int irq;
  28         struct snd_pcm_substream *stream;
  29         int period_next;
  30         int period_current;
  31         int period_bytes;
  32         int period_count;
  33
  34         /* AC97 state */
  35         u32 ac97_slot_bits;
  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  */
  51 struct 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
  76 /* Utility for retrieving psc_dma_stream structure from a substream */
  77 static inline struct psc_dma_stream *
  78 to_psc_dma_stream(struct snd_pcm_substream *substream, struct psc_dma *psc_dma)
  79 {
  80         if (substream->pstr->stream == SNDRV_PCM_STREAM_CAPTURE)
  81                 return &psc_dma->capture;
  82         return &psc_dma->playback;
  83 }
  84
  85 int mpc5200_audio_dma_create(struct platform_device *op);
  86 int mpc5200_audio_dma_destroy(struct platform_device *op);
  87
  88 #endif /* __SOUND_SOC_FSL_MPC5200_DMA_H__ */