1 /* linux/include/asm-arm/plat-s3c24xx/dma.h
3 * Copyright (C) 2006 Simtec Electronics
4 * Ben Dooks <ben@simtec.co.uk>
6 * Samsung S3C24XX DMA support
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.
13 extern struct sysdev_class dma_sysclass;
14 extern struct s3c2410_dma_chan s3c2410_chans[S3C2410_DMA_CHANNELS];
16 #define DMA_CH_VALID (1<<31)
17 #define DMA_CH_NEVER (1<<30)
19 struct s3c24xx_dma_addr {
24 /* struct s3c24xx_dma_map
26 * this holds the mapping information for the channel selected
27 * to be connected to the specified device
30 struct s3c24xx_dma_map {
32 struct s3c24xx_dma_addr hw_addr;
34 unsigned long channels[S3C2410_DMA_CHANNELS];
35 unsigned long channels_rx[S3C2410_DMA_CHANNELS];
38 struct s3c24xx_dma_selection {
39 struct s3c24xx_dma_map *map;
40 unsigned long map_size;
41 unsigned long dcon_mask;
43 void (*select)(struct s3c2410_dma_chan *chan,
44 struct s3c24xx_dma_map *map);
46 void (*direction)(struct s3c2410_dma_chan *chan,
47 struct s3c24xx_dma_map *map,
48 enum s3c2410_dmasrc dir);
51 extern int s3c24xx_dma_init_map(struct s3c24xx_dma_selection *sel);
53 /* struct s3c24xx_dma_order_ch
55 * channel map for one of the `enum dma_ch` dma channels. the list
56 * entry contains a set of low-level channel numbers, orred with
57 * DMA_CH_VALID, which are checked in the order in the array.
60 struct s3c24xx_dma_order_ch {
61 unsigned int list[S3C2410_DMA_CHANNELS]; /* list of channels */
62 unsigned int flags; /* flags */
65 /* struct s3c24xx_dma_order
67 * information provided by either the core or the board to give the
68 * dma system a hint on how to allocate channels
71 struct s3c24xx_dma_order {
72 struct s3c24xx_dma_order_ch channels[DMACH_MAX];
75 extern int s3c24xx_dma_order_set(struct s3c24xx_dma_order *map);
77 /* DMA init code, called from the cpu support code */
79 extern int s3c2410_dma_init(void);
81 extern int s3c24xx_dma_init(unsigned int channels, unsigned int irq,