1 /* SPDX-License-Identifier: GPL-2.0 */
2 /*
3  * Copyright 2019 NXP
4  *
5  */
6 
7 #ifndef _FSL_ASRC_COMMON_H
8 #define _FSL_ASRC_COMMON_H
9 
10 /* directions */
11 #define IN	0
12 #define OUT	1
13 
14 enum asrc_pair_index {
15 	ASRC_INVALID_PAIR = -1,
16 	ASRC_PAIR_A = 0,
17 	ASRC_PAIR_B = 1,
18 	ASRC_PAIR_C = 2,
19 	ASRC_PAIR_D = 3,
20 };
21 
22 #define PAIR_CTX_NUM  0x4
23 
24 /**
25  * fsl_asrc_pair: ASRC Pair common data
26  *
27  * @asrc: pointer to its parent module
28  * @error: error record
29  * @index: pair index (ASRC_PAIR_A, ASRC_PAIR_B, ASRC_PAIR_C)
30  * @channels: occupied channel number
31  * @desc: input and output dma descriptors
32  * @dma_chan: inputer and output DMA channels
33  * @dma_data: private dma data
34  * @pos: hardware pointer position
35  * @req_dma_chan: flag to release dev_to_dev chan
36  * @private: pair private area
37  */
38 struct fsl_asrc_pair {
39 	struct fsl_asrc *asrc;
40 	unsigned int error;
41 
42 	enum asrc_pair_index index;
43 	unsigned int channels;
44 
45 	struct dma_async_tx_descriptor *desc[2];
46 	struct dma_chan *dma_chan[2];
47 	struct imx_dma_data dma_data;
48 	unsigned int pos;
49 	bool req_dma_chan;
50 
51 	void *private;
52 };
53 
54 /**
55  * fsl_asrc: ASRC common data
56  *
57  * @dma_params_rx: DMA parameters for receive channel
58  * @dma_params_tx: DMA parameters for transmit channel
59  * @pdev: platform device pointer
60  * @regmap: regmap handler
61  * @paddr: physical address to the base address of registers
62  * @mem_clk: clock source to access register
63  * @ipg_clk: clock source to drive peripheral
64  * @spba_clk: SPBA clock (optional, depending on SoC design)
65  * @lock: spin lock for resource protection
66  * @pair: pair pointers
67  * @channel_avail: non-occupied channel numbers
68  * @asrc_rate: default sample rate for ASoC Back-Ends
69  * @asrc_format: default sample format for ASoC Back-Ends
70  * @use_edma: edma is used
71  * @get_dma_channel: function pointer
72  * @request_pair: function pointer
73  * @release_pair: function pointer
74  * @get_fifo_addr: function pointer
75  * @pair_priv_size: size of pair private struct.
76  * @private: private data structure
77  */
78 struct fsl_asrc {
79 	struct snd_dmaengine_dai_dma_data dma_params_rx;
80 	struct snd_dmaengine_dai_dma_data dma_params_tx;
81 	struct platform_device *pdev;
82 	struct regmap *regmap;
83 	unsigned long paddr;
84 	struct clk *mem_clk;
85 	struct clk *ipg_clk;
86 	struct clk *spba_clk;
87 	spinlock_t lock;      /* spin lock for resource protection */
88 
89 	struct fsl_asrc_pair *pair[PAIR_CTX_NUM];
90 	unsigned int channel_avail;
91 
92 	int asrc_rate;
93 	snd_pcm_format_t asrc_format;
94 	bool use_edma;
95 
96 	struct dma_chan *(*get_dma_channel)(struct fsl_asrc_pair *pair, bool dir);
97 	int (*request_pair)(int channels, struct fsl_asrc_pair *pair);
98 	void (*release_pair)(struct fsl_asrc_pair *pair);
99 	int (*get_fifo_addr)(u8 dir, enum asrc_pair_index index);
100 	size_t pair_priv_size;
101 
102 	void *private;
103 };
104 
105 #define DRV_NAME "fsl-asrc-dai"
106 extern struct snd_soc_component_driver fsl_asrc_component;
107 
108 #endif /* _FSL_ASRC_COMMON_H */
109