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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
Russell King4baa9922008-08-02 10:55:55 +01002 * arch/arm/include/asm/mach/dma.h
Linus Torvalds1da177e2005-04-16 15:20:36 -07003 *
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
14struct dma_struct;
15typedef struct dma_struct dma_t;
16
17struct dma_ops {
Russell King1df81302008-12-08 15:58:50 +000018 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 */
Russell King8c56afc2008-12-11 14:50:39 +000024 const char *type;
Linus Torvalds1da177e2005-04-16 15:20:36 -070025};
26
27struct dma_struct {
Russell King7cdad482006-01-04 15:08:30 +000028 void *addr; /* single DMA address */
29 unsigned long count; /* single DMA size */
Linus Torvalds1da177e2005-04-16 15:20:36 -070030 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 */
Russell King7cdad482006-01-04 15:08:30 +000036
Russell Kingf0ffc812009-01-02 12:34:55 +000037 unsigned int dma_mode; /* DMA mode */
Linus Torvalds1da177e2005-04-16 15:20:36 -070038 int speed; /* DMA speed */
39
40 unsigned int lock; /* Device is allocated */
41 const char *device_id; /* Device name */
42
Russell King8c56afc2008-12-11 14:50:39 +000043 const struct dma_ops *d_ops;
Linus Torvalds1da177e2005-04-16 15:20:36 -070044};
45
Russell King2f757f22008-12-08 16:33:30 +000046/*
47 * isa_dma_add - add an ISA-style DMA channel
Linus Torvalds1da177e2005-04-16 15:20:36 -070048 */
Russell King2f757f22008-12-08 16:33:30 +000049extern int isa_dma_add(unsigned int, dma_t *dma);
Linus Torvalds1da177e2005-04-16 15:20:36 -070050
Russell King2f757f22008-12-08 16:33:30 +000051/*
52 * Add the ISA DMA controller. Always takes channels 0-7.
53 */
54extern void isa_init_dma(void);