0c6022d453
Allow the CPU code, and any board specific initialisation code to change the allocation order of the DMA channels, or stop a peripheral allocating any DMA at-all. This is due to the scarce mapping of DMA channels on some earlier S3C24XX cpus, where the selection changes depending on the channel in use. Signed-off-by: Ben Dooks <ben-linux@fluff.org> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
71 lines
1.8 KiB
C
71 lines
1.8 KiB
C
/* linux/include/asm-arm/plat-s3c24xx/dma.h
|
|
*
|
|
* Copyright (C) 2006 Simtec Electronics
|
|
* Ben Dooks <ben@simtec.co.uk>
|
|
*
|
|
* Samsung S3C24XX DMA support
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License version 2 as
|
|
* published by the Free Software Foundation.
|
|
*/
|
|
|
|
extern struct sysdev_class dma_sysclass;
|
|
extern struct s3c2410_dma_chan s3c2410_chans[S3C2410_DMA_CHANNELS];
|
|
|
|
#define DMA_CH_VALID (1<<31)
|
|
#define DMA_CH_NEVER (1<<30)
|
|
|
|
struct s3c24xx_dma_addr {
|
|
unsigned long from;
|
|
unsigned long to;
|
|
};
|
|
|
|
/* struct s3c24xx_dma_map
|
|
*
|
|
* this holds the mapping information for the channel selected
|
|
* to be connected to the specified device
|
|
*/
|
|
|
|
struct s3c24xx_dma_map {
|
|
const char *name;
|
|
struct s3c24xx_dma_addr hw_addr;
|
|
|
|
unsigned long channels[S3C2410_DMA_CHANNELS];
|
|
};
|
|
|
|
struct s3c24xx_dma_selection {
|
|
struct s3c24xx_dma_map *map;
|
|
unsigned long map_size;
|
|
unsigned long dcon_mask;
|
|
|
|
void (*select)(struct s3c2410_dma_chan *chan,
|
|
struct s3c24xx_dma_map *map);
|
|
};
|
|
|
|
extern int s3c24xx_dma_init_map(struct s3c24xx_dma_selection *sel);
|
|
|
|
/* struct s3c24xx_dma_order_ch
|
|
*
|
|
* channel map for one of the `enum dma_ch` dma channels. the list
|
|
* entry contains a set of low-level channel numbers, orred with
|
|
* DMA_CH_VALID, which are checked in the order in the array.
|
|
*/
|
|
|
|
struct s3c24xx_dma_order_ch {
|
|
unsigned int list[S3C2410_DMA_CHANNELS]; /* list of channels */
|
|
unsigned int flags; /* flags */
|
|
};
|
|
|
|
/* struct s3c24xx_dma_order
|
|
*
|
|
* information provided by either the core or the board to give the
|
|
* dma system a hint on how to allocate channels
|
|
*/
|
|
|
|
struct s3c24xx_dma_order {
|
|
struct s3c24xx_dma_order_ch channels[DMACH_MAX];
|
|
};
|
|
|
|
extern int s3c24xx_dma_order_set(struct s3c24xx_dma_order *map);
|