1 /* linux/include/asm-arm/plat-s3c24xx/dma.h 2 * 3 * Copyright (C) 2006 Simtec Electronics 4 * Ben Dooks <ben@simtec.co.uk> 5 * 6 * Samsung S3C24XX DMA support 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 extern struct sysdev_class dma_sysclass; 14 extern struct s3c2410_dma_chan s3c2410_chans[S3C2410_DMA_CHANNELS]; 15 16 #define DMA_CH_VALID (1<<31) 17 #define DMA_CH_NEVER (1<<30) 18 19 struct s3c24xx_dma_addr { 20 unsigned long from; 21 unsigned long to; 22 }; 23 24 /* struct s3c24xx_dma_map 25 * 26 * this holds the mapping information for the channel selected 27 * to be connected to the specified device 28 */ 29 30 struct s3c24xx_dma_map { 31 const char *name; 32 struct s3c24xx_dma_addr hw_addr; 33 34 unsigned long channels[S3C2410_DMA_CHANNELS]; 35 unsigned long channels_rx[S3C2410_DMA_CHANNELS]; 36 }; 37 38 struct s3c24xx_dma_selection { 39 struct s3c24xx_dma_map *map; 40 unsigned long map_size; 41 unsigned long dcon_mask; 42 43 void (*select)(struct s3c2410_dma_chan *chan, 44 struct s3c24xx_dma_map *map); 45 46 void (*direction)(struct s3c2410_dma_chan *chan, 47 struct s3c24xx_dma_map *map, 48 enum s3c2410_dmasrc dir); 49 }; 50 51 extern int s3c24xx_dma_init_map(struct s3c24xx_dma_selection *sel); 52 53 /* struct s3c24xx_dma_order_ch 54 * 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. 58 */ 59 60 struct s3c24xx_dma_order_ch { 61 unsigned int list[S3C2410_DMA_CHANNELS]; /* list of channels */ 62 unsigned int flags; /* flags */ 63 }; 64 65 /* struct s3c24xx_dma_order 66 * 67 * information provided by either the core or the board to give the 68 * dma system a hint on how to allocate channels 69 */ 70 71 struct s3c24xx_dma_order { 72 struct s3c24xx_dma_order_ch channels[DMACH_MAX]; 73 }; 74 75 extern int s3c24xx_dma_order_set(struct s3c24xx_dma_order *map); 76 77 /* DMA init code, called from the cpu support code */ 78 79 extern int s3c2410_dma_init(void); 80 81 extern int s3c24xx_dma_init(unsigned int channels, unsigned int irq, 82 unsigned int stride); 83