cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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mpc5200_dma.h (2408B)

      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 */
     22struct 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 */
     51struct 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 */
     77static inline struct psc_dma_stream *
     78to_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
     85int mpc5200_audio_dma_create(struct platform_device *op);
     86int mpc5200_audio_dma_destroy(struct platform_device *op);
     87
     88#endif /* __SOUND_SOC_FSL_MPC5200_DMA_H__ */