1 /* linux/arch/arm/plat-samsung/include/plat/dma-s3c24xx.h
2  *
3  * Copyright (C) 2006 Simtec Electronics
4  *	Ben Dooks <ben@simtec.co.uk>
5  *
6  * Samsung S3C24XX DMA support - per SoC functions
7  *
8  * This program is free software; you can redistribute it and/or modify
9  * it under the terms of the GNU General Public License version 2 as
10  * published by the Free Software Foundation.
11 */
12 
13 #include <plat/dma-core.h>
14 
15 extern struct sysdev_class dma_sysclass;
16 extern struct s3c2410_dma_chan s3c2410_chans[S3C_DMA_CHANNELS];
17 
18 #define DMA_CH_VALID		(1<<31)
19 #define DMA_CH_NEVER		(1<<30)
20 
21 struct s3c24xx_dma_addr {
22 	unsigned long		from;
23 	unsigned long		to;
24 };
25 
26 /* struct s3c24xx_dma_map
27  *
28  * this holds the mapping information for the channel selected
29  * to be connected to the specified device
30 */
31 
32 struct s3c24xx_dma_map {
33 	const char		*name;
34 	struct s3c24xx_dma_addr  hw_addr;
35 
36 	unsigned long		 channels[S3C_DMA_CHANNELS];
37 	unsigned long		 channels_rx[S3C_DMA_CHANNELS];
38 };
39 
40 struct s3c24xx_dma_selection {
41 	struct s3c24xx_dma_map	*map;
42 	unsigned long		 map_size;
43 	unsigned long		 dcon_mask;
44 
45 	void	(*select)(struct s3c2410_dma_chan *chan,
46 			  struct s3c24xx_dma_map *map);
47 
48 	void	(*direction)(struct s3c2410_dma_chan *chan,
49 			     struct s3c24xx_dma_map *map,
50 			     enum s3c2410_dmasrc dir);
51 };
52 
53 extern int s3c24xx_dma_init_map(struct s3c24xx_dma_selection *sel);
54 
55 /* struct s3c24xx_dma_order_ch
56  *
57  * channel map for one of the `enum dma_ch` dma channels. the list
58  * entry contains a set of low-level channel numbers, orred with
59  * DMA_CH_VALID, which are checked in the order in the array.
60 */
61 
62 struct s3c24xx_dma_order_ch {
63 	unsigned int	list[S3C_DMA_CHANNELS];	/* list of channels */
64 	unsigned int	flags;				/* flags */
65 };
66 
67 /* struct s3c24xx_dma_order
68  *
69  * information provided by either the core or the board to give the
70  * dma system a hint on how to allocate channels
71 */
72 
73 struct s3c24xx_dma_order {
74 	struct s3c24xx_dma_order_ch	channels[DMACH_MAX];
75 };
76 
77 extern int s3c24xx_dma_order_set(struct s3c24xx_dma_order *map);
78 
79 /* DMA init code, called from the cpu support code */
80 
81 extern int s3c2410_dma_init(void);
82 
83 extern int s3c24xx_dma_init(unsigned int channels, unsigned int irq,
84 			    unsigned int stride);
85