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
15/*
16 * Descriptor structure for PXA's DMA engine
17 * Note: this structure must always be aligned to a 16-byte boundary.
18 */
19
20typedef 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
27typedef enum {
28	DMA_PRIO_HIGH = 0,
29	DMA_PRIO_MEDIUM = 1,
30	DMA_PRIO_LOW = 2
31} pxa_dma_prio;
32
33#if defined(CONFIG_PXA27x)
34
35#define PXA_DMA_CHANNELS	32
36
37#define pxa_for_each_dma_prio(ch, prio)					\
38for (									\
39	ch = prio * 4;							\
40	ch != (4 << prio) + 16;						\
41	ch = (ch + 1 == (4 << prio)) ? (prio * 4 + 16) : (ch + 1)	\
42)
43
44#elif defined(CONFIG_PXA25x)
45
46#define PXA_DMA_CHANNELS	16
47
48#define pxa_for_each_dma_prio(ch, prio)					\
49	for (ch = prio * 4; ch != (4 << prio); ch++)
50
51#endif
52
53/*
54 * DMA registration
55 */
56
57int pxa_request_dma (char *name,
58			 pxa_dma_prio prio,
59			 void (*irq_handler)(int, void *),
60			 void *data);
61
62void pxa_free_dma (int dma_ch);
63
64#endif /* _ASM_ARCH_DMA_H */
65