[linux-block.git] / include / asm-arm / arch-pxa / dma.h

/*
 *  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;

typedef enum {
	DMA_PRIO_HIGH = 0,
	DMA_PRIO_MEDIUM = 1,
	DMA_PRIO_LOW = 2
} pxa_dma_prio;

#if defined(CONFIG_PXA27x)

#define PXA_DMA_CHANNELS	32

#define pxa_for_each_dma_prio(ch, prio)					\
for (									\
	ch = prio * 4;							\
	ch != (4 << prio) + 16;						\
	ch = (ch + 1 == (4 << prio)) ? (prio * 4 + 16) : (ch + 1)	\
)

#elif defined(CONFIG_PXA25x)

#define PXA_DMA_CHANNELS	16

#define pxa_for_each_dma_prio(ch, prio)					\
	for (ch = prio * 4; ch != (4 << prio); ch++)

#endif

/*
 * DMA registration
 */

int pxa_request_dma (char *name,
			 pxa_dma_prio prio,
			 void (*irq_handler)(int, void *),
			 void *data);

void pxa_free_dma (int dma_ch);

#endif /* _ASM_ARCH_DMA_H */
Commit	Line	Data
1da177e4 LT	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
	14
1da177e4 LT	15	/*
	16	* Descriptor structure for PXA's DMA engine
	17	* Note: this structure must always be aligned to a 16-byte boundary.
	18	*/
	19
	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;
	26
99532559 NP	27	typedef enum {
	28	DMA_PRIO_HIGH = 0,
	29	DMA_PRIO_MEDIUM = 1,
	30	DMA_PRIO_LOW = 2
	31	} pxa_dma_prio;
	32
1da177e4 LT	33	#if defined(CONFIG_PXA27x)
	34
	35	#define PXA_DMA_CHANNELS 32
1da177e4	36
99532559 NP	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	)
1da177e4 LT	43
	44	#elif defined(CONFIG_PXA25x)
	45
	46	#define PXA_DMA_CHANNELS 16
1da177e4	47
99532559 NP	48	#define pxa_for_each_dma_prio(ch, prio) \
99532559 NP	49	for (ch = prio * 4; ch != (4 << prio); ch++)
1da177e4 LT	50
	51	#endif
	52
	53	/*
	54	* DMA registration
	55	*/
	56
	57	int pxa_request_dma (char *name,
	58	pxa_dma_prio prio,
0cd61b68	59	void (irq_handler)(int, void ),
1da177e4 LT	60	void *data);
	61
	62	void pxa_free_dma (int dma_ch);
	63
	64	#endif /* _ASM_ARCH_DMA_H */