ia64/linux-2.6.18-xen.hg

view include/asm-arm/arch-pxa/dma.h @ 782:9ab1c319531f

merge with linux-2.6.18-xen.hg
author Isaku Yamahata <yamahata@valinux.co.jp>
date Wed Jan 28 13:07:23 2009 +0900 (2009-01-28)
parents 831230e53067
children
line source
1 /*
2 * linux/include/asm-arm/arch-pxa/dma.h
3 *
4 * Author: Nicolas Pitre
5 * Created: Jun 15, 2001
6 * Copyright: MontaVista Software, Inc.
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License version 2 as
10 * published by the Free Software Foundation.
11 */
12 #ifndef __ASM_ARCH_DMA_H
13 #define __ASM_ARCH_DMA_H
15 /*
16 * Descriptor structure for PXA's DMA engine
17 * Note: this structure must always be aligned to a 16-byte boundary.
18 */
20 typedef struct pxa_dma_desc {
21 volatile u32 ddadr; /* Points to the next descriptor + flags */
22 volatile u32 dsadr; /* DSADR value for the current transfer */
23 volatile u32 dtadr; /* DTADR value for the current transfer */
24 volatile u32 dcmd; /* DCMD value for the current transfer */
25 } pxa_dma_desc;
27 typedef enum {
28 DMA_PRIO_HIGH = 0,
29 DMA_PRIO_MEDIUM = 1,
30 DMA_PRIO_LOW = 2
31 } pxa_dma_prio;
33 #if defined(CONFIG_PXA27x)
35 #define PXA_DMA_CHANNELS 32
37 #define pxa_for_each_dma_prio(ch, prio) \
38 for ( \
39 ch = prio * 4; \
40 ch != (4 << prio) + 16; \
41 ch = (ch + 1 == (4 << prio)) ? (prio * 4 + 16) : (ch + 1) \
42 )
44 #elif defined(CONFIG_PXA25x)
46 #define PXA_DMA_CHANNELS 16
48 #define pxa_for_each_dma_prio(ch, prio) \
49 for (ch = prio * 4; ch != (4 << prio); ch++)
51 #endif
53 /*
54 * DMA registration
55 */
57 int pxa_request_dma (char *name,
58 pxa_dma_prio prio,
59 void (*irq_handler)(int, void *, struct pt_regs *),
60 void *data);
62 void pxa_free_dma (int dma_ch);
64 #endif /* _ASM_ARCH_DMA_H */