Viewing file:  dma.h (1.71 KB) -rw-r--r--
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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 */
int state; /* Controller state */
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);
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