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__ */
89
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