dma-s3c24xx.h

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/* linux/arch/arm/plat-samsung/include/plat/dma-s3c24xx.h
 *
 * Copyright (C) 2006 Simtec Electronics
 *  Ben Dooks <[email protected]>
 *
 * Samsung S3C24XX DMA support - per SoC functions
 *
 * 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.
*/

#include <plat/dma-core.h>

extern struct bus_type dma_subsys;
extern struct s3c2410_dma_chan s3c2410_chans[S3C_DMA_CHANNELS];

#define DMA_CH_VALID        (1<<31)
#define DMA_CH_NEVER        (1<<30)

/* 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;

    unsigned long        channels[S3C_DMA_CHANNELS];
    unsigned long        channels_rx[S3C_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);

    void    (*direction)(struct s3c2410_dma_chan *chan,
                 struct s3c24xx_dma_map *map,
                 enum dma_data_direction dir);
};

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[S3C_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);

/* DMA init code, called from the cpu support code */

extern int s3c2410_dma_init(void);

extern int s3c24xx_dma_init(unsigned int channels, unsigned int irq,
                unsigned int stride);