Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
Russell King | 4baa992 | 2008-08-02 10:55:55 +0100 | [diff] [blame] | 2 | * arch/arm/include/asm/mach/dma.h |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 { |
Russell King | 1df8130 | 2008-12-08 15:58:50 +0000 | [diff] [blame] | 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 */ |
Russell King | 8c56afc | 2008-12-11 14:50:39 +0000 | [diff] [blame] | 24 | const char *type; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 25 | }; |
| 26 | |
| 27 | struct dma_struct { |
Russell King | 7cdad48 | 2006-01-04 15:08:30 +0000 | [diff] [blame] | 28 | void *addr; /* single DMA address */ |
| 29 | unsigned long count; /* single DMA size */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 */ |
Russell King | 7cdad48 | 2006-01-04 15:08:30 +0000 | [diff] [blame] | 36 | |
Russell King | f0ffc81 | 2009-01-02 12:34:55 +0000 | [diff] [blame] | 37 | unsigned int dma_mode; /* DMA mode */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 38 | int speed; /* DMA speed */ |
| 39 | |
| 40 | unsigned int lock; /* Device is allocated */ |
| 41 | const char *device_id; /* Device name */ |
| 42 | |
Russell King | 8c56afc | 2008-12-11 14:50:39 +0000 | [diff] [blame] | 43 | const struct dma_ops *d_ops; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 44 | }; |
| 45 | |
Russell King | 2f757f2 | 2008-12-08 16:33:30 +0000 | [diff] [blame] | 46 | /* |
| 47 | * isa_dma_add - add an ISA-style DMA channel |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 48 | */ |
Russell King | 2f757f2 | 2008-12-08 16:33:30 +0000 | [diff] [blame] | 49 | extern int isa_dma_add(unsigned int, dma_t *dma); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 50 | |
Russell King | 2f757f2 | 2008-12-08 16:33:30 +0000 | [diff] [blame] | 51 | /* |
| 52 | * Add the ISA DMA controller. Always takes channels 0-7. |
| 53 | */ |
| 54 | extern void isa_init_dma(void); |