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 | |