2 * linux/include/asm-arm/arch-pxa/dma.h
4 * Author: Nicolas Pitre
5 * Created: Jun 15, 2001
6 * Copyright: MontaVista Software, Inc.
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.
12 #ifndef __ASM_ARCH_DMA_H
13 #define __ASM_ARCH_DMA_H
15 /* No DMA as the rest of the world see it */
16 #define MAX_DMA_CHANNELS 0
19 * Descriptor structure for PXA's DMA engine
20 * Note: this structure must always be aligned to a 16-byte boundary.
23 typedef struct pxa_dma_desc {
24 volatile u32 ddadr; /* Points to the next descriptor + flags */
25 volatile u32 dsadr; /* DSADR value for the current transfer */
26 volatile u32 dtadr; /* DTADR value for the current transfer */
27 volatile u32 dcmd; /* DCMD value for the current transfer */
30 #if defined(CONFIG_PXA27x)
32 #define PXA_DMA_CHANNELS 32
33 #define PXA_DMA_NBCH(prio) ((prio == DMA_PRIO_LOW) ? 16 : 8)
41 #elif defined(CONFIG_PXA25x)
43 #define PXA_DMA_CHANNELS 16
44 #define PXA_DMA_NBCH(prio) ((prio == DMA_PRIO_LOW) ? 8 : 4)
58 int pxa_request_dma (char *name,
60 void (*irq_handler)(int, void *, struct pt_regs *),
63 void pxa_free_dma (int dma_ch);
65 #endif /* _ASM_ARCH_DMA_H */