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/*
* linux/arch/arm/kernel/dma.h
*
* Copyright (C) 1998-2000 Russell King
*
* 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 {
dmasg_t buf; /* single DMA */
int sgcount; /* number of DMA SG */
dmasg_t *sg; /* DMA Scatter-Gather List */
unsigned int active:1; /* Transfer active */
unsigned int invalid:1; /* Address/Count changed */
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 */
dmasg_t 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
*/
void arch_dma_init(dma_t *dma);
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