/* SPDX-License-Identifier: GPL-2.0 */
/*
 * Freescale MPC5200 Audio DMA driver
 */

#ifndef __SOUND_SOC_FSL_MPC5200_DMA_H__
#define __SOUND_SOC_FSL_MPC5200_DMA_H__

#define PSC_STREAM_NAME_LEN 32

/**
 * psc_ac97_stream - Data specific to a single stream (playback or capture)
 * @active:             flag indicating if the stream is active
 * @psc_dma:            pointer back to parent psc_dma data structure
 * @bcom_task:          bestcomm task structure
 * @irq:                irq number for bestcomm task
 * @period_end:         physical address of end of DMA region
 * @period_next_pt:     physical address of next DMA buffer to enqueue
 * @period_bytes:       size of DMA period in bytes
 * @ac97_slot_bits:     Enable bits for turning on the correct AC97 slot
 */
struct psc_dma_stream {
        struct snd_pcm_runtime *runtime;
        int active;
        struct psc_dma *psc_dma;
        struct bcom_task *bcom_task;
        int irq;
        struct snd_pcm_substream *stream;
        int period_next;
        int period_current;
        int period_bytes;
        int period_count;

        /* AC97 state */
        u32 ac97_slot_bits;
};

/**
 * psc_dma - Private driver data
 * @name: short name for this device ("PSC0", "PSC1", etc)
 * @psc_regs: pointer to the PSC's registers
 * @fifo_regs: pointer to the PSC's FIFO registers
 * @irq: IRQ of this PSC
 * @dev: struct device pointer
 * @dai: the CPU DAI for this device
 * @sicr: Base value used in serial interface control register; mode is ORed
 *        with this value.
 * @playback: Playback stream context data
 * @capture: Capture stream context data
 */
struct psc_dma {
        char name[32];
        struct mpc52xx_psc __iomem *psc_regs;
        struct mpc52xx_psc_fifo __iomem *fifo_regs;
        unsigned int irq;
        struct device *dev;
        spinlock_t lock;
        struct mutex mutex;
        u32 sicr;
        uint sysclk;
        int imr;
        int id;
        unsigned int slots;

        /* per-stream data */
        struct psc_dma_stream playback;
        struct psc_dma_stream capture;

        /* Statistics */
        struct {
                unsigned long overrun_count;
                unsigned long underrun_count;
        } stats;
};

/* Utility for retrieving psc_dma_stream structure from a substream */
static inline struct psc_dma_stream *
to_psc_dma_stream(struct snd_pcm_substream *substream, struct psc_dma *psc_dma)
{
        if (substream->pstr->stream == SNDRV_PCM_STREAM_CAPTURE)
                return &psc_dma->capture;
        return &psc_dma->playback;
}

int mpc5200_audio_dma_create(struct platform_device *op);
int mpc5200_audio_dma_destroy(struct platform_device *op);

#endif /* __SOUND_SOC_FSL_MPC5200_DMA_H__ */