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/*

 *  linux/include/asm-arm/mach/dma.h

 *

 *  Copyright (C) 1998-2000 Russell King

 *

 * 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.

 *

 *  This header file describes the interface between the generic DMA handler

 *  (dma.c) and the architecture-specific DMA backends (dma-*.c)

 */

struct dma_struct;

typedef struct dma_struct dma_t;

struct dma_ops {

        int     (*request)(dmach_t, dma_t *);           /* optional */

        void    (*free)(dmach_t, dma_t *);              /* optional */

        void    (*enable)(dmach_t, dma_t *);            /* mandatory */

        void    (*disable)(dmach_t, dma_t *);           /* mandatory */

        int     (*residue)(dmach_t, dma_t *);           /* optional */

        int     (*setspeed)(dmach_t, dma_t *, int);     /* optional */

        char    *type;

};

struct dma_struct {

        struct scatterlist buf;         /* single DMA                   */

        int             sgcount;        /* number of DMA SG             */

        struct scatterlist *sg;         /* DMA Scatter-Gather List      */

        unsigned int    active:1;       /* Transfer active              */

        unsigned int    invalid:1;      /* Address/Count changed        */

        unsigned int    using_sg:1;     /* using scatter list?          */

        dmamode_t       dma_mode;       /* DMA mode                     */

        int             speed;          /* DMA speed                    */

        unsigned int    lock;           /* Device is allocated          */

        const char      *device_id;     /* Device name                  */

        unsigned int    dma_base;       /* Controller base address      */

        int             dma_irq;        /* Controller IRQ               */

        struct scatterlist cur_sg;      /* Current controller buffer    */

        struct dma_ops  *d_ops;

};

/* Prototype: void arch_dma_init(dma)

 * Purpose  : Initialise architecture specific DMA

 * Params   : dma - pointer to array of DMA structures

 */

extern void arch_dma_init(dma_t *dma);

extern void isa_init_dma(dma_t *dma);