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__ */
89