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/*
* linux/include/asm-arm/arch-pxa/dma.h
*
* Author: Nicolas Pitre
* Created: Jun 15, 2001
* Copyright: MontaVista Software, Inc.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
#ifndef __ASM_ARCH_DMA_H
#define __ASM_ARCH_DMA_H
/*
* Descriptor structure for PXA's DMA engine
* Note: this structure must always be aligned to a 16-byte boundary.
*/
typedef struct pxa_dma_desc {
volatile u32 ddadr; /* Points to the next descriptor + flags */
volatile u32 dsadr; /* DSADR value for the current transfer */
volatile u32 dtadr; /* DTADR value for the current transfer */
volatile u32 dcmd; /* DCMD value for the current transfer */
} pxa_dma_desc;
#if defined(CONFIG_PXA27x)
#define PXA_DMA_CHANNELS 32
#define PXA_DMA_NBCH(prio) ((prio == DMA_PRIO_LOW) ? 16 : 8)
typedef enum {
DMA_PRIO_HIGH = 0,
DMA_PRIO_MEDIUM = 8,
DMA_PRIO_LOW = 16
} pxa_dma_prio;
#elif defined(CONFIG_PXA25x)
#define PXA_DMA_CHANNELS 16
#define PXA_DMA_NBCH(prio) ((prio == DMA_PRIO_LOW) ? 8 : 4)
typedef enum {
DMA_PRIO_HIGH = 0,
DMA_PRIO_MEDIUM = 4,
DMA_PRIO_LOW = 8
} pxa_dma_prio;
#endif
/*
* DMA registration
*/
int pxa_request_dma (char *name,
pxa_dma_prio prio,
void (*irq_handler)(int, void *, struct pt_regs *),
void *data);
void pxa_free_dma (int dma_ch);
#endif /* _ASM_ARCH_DMA_H */
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