47 lines
1.3 KiB
C
47 lines
1.3 KiB
C
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/* SPDX-License-Identifier: GPL-2.0-only */
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/*
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* arch/arm/include/asm/mach/dma.h
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*
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* Copyright (C) 1998-2000 Russell King
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*
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* This header file describes the interface between the generic DMA handler
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* (dma.c) and the architecture-specific DMA backends (dma-*.c)
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*/
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struct dma_struct;
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typedef struct dma_struct dma_t;
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struct dma_ops {
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int (*request)(unsigned int, dma_t *); /* optional */
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void (*free)(unsigned int, dma_t *); /* optional */
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void (*enable)(unsigned int, dma_t *); /* mandatory */
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void (*disable)(unsigned int, dma_t *); /* mandatory */
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int (*residue)(unsigned int, dma_t *); /* optional */
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int (*setspeed)(unsigned int, dma_t *, int); /* optional */
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const char *type;
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};
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struct dma_struct {
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void *addr; /* single DMA address */
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unsigned long count; /* single DMA size */
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struct scatterlist buf; /* single DMA */
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int sgcount; /* number of DMA SG */
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struct scatterlist *sg; /* DMA Scatter-Gather List */
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unsigned int active:1; /* Transfer active */
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unsigned int invalid:1; /* Address/Count changed */
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unsigned int dma_mode; /* DMA mode */
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int speed; /* DMA speed */
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unsigned int lock; /* Device is allocated */
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const char *device_id; /* Device name */
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const struct dma_ops *d_ops;
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};
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/*
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* isa_dma_add - add an ISA-style DMA channel
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*/
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extern int isa_dma_add(unsigned int, dma_t *dma);
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