1 /*
2 * arch/arm/include/asm/mach/dma.h
3 *
4 * Copyright (C) 1998-2000 Russell King
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 as
8 * published by the Free Software Foundation.
9 *
10 * This header file describes the interface between the generic DMA handler
11 * (dma.c) and the architecture-specific DMA backends (dma-*.c)
12 */
13
14 struct dma_struct;
15 typedef struct dma_struct dma_t;
16
17 struct dma_ops {
18 int (*request)(unsigned int, dma_t *); /* optional */
19 void (*free)(unsigned int, dma_t *); /* optional */
20 void (*enable)(unsigned int, dma_t *); /* mandatory */
21 void (*disable)(unsigned int, dma_t *); /* mandatory */
22 int (*residue)(unsigned int, dma_t *); /* optional */
23 int (*setspeed)(unsigned int, dma_t *, int); /* optional */
24 const char *type;
25 };
26
27 struct dma_struct {
28 void *addr; /* single DMA address */
29 unsigned long count; /* single DMA size */
30 struct scatterlist buf; /* single DMA */
31 int sgcount; /* number of DMA SG */
32 struct scatterlist *sg; /* DMA Scatter-Gather List */
33
34 unsigned int active:1; /* Transfer active */
35 unsigned int invalid:1; /* Address/Count changed */
36
37 unsigned int dma_mode; /* DMA mode */
38 int speed; /* DMA speed */
39
40 unsigned int lock; /* Device is allocated */
41 const char *device_id; /* Device name */
42
43 const struct dma_ops *d_ops;
44 };
45
46 /*
47 * isa_dma_add - add an ISA-style DMA channel
48 */
49 extern int isa_dma_add(unsigned int, dma_t *dma);
50
51 /*
52 * Add the ISA DMA controller. Always takes channels 0-7.
53 */
54 extern void isa_init_dma(void);
55
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