68 lines
1.5 KiB
C
68 lines
1.5 KiB
C
|
/*
|
||
|
|
* 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
|
||
|
|
|
||
|
|
#define MAX_DMA_ADDRESS 0xffffffff
|
||
|
|
|
||
|
|
/* No DMA as the rest of the world see it */
|
||
|
|
#define MAX_DMA_CHANNELS 0
|
||
|
|
|
||
|
|
/*
|
||
|
|
* 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 */
|