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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) \ |
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, | |
59 | void (*irq_handler)(int, void *, struct pt_regs *), | |
60 | void *data); | |
61 | ||
62 | void pxa_free_dma (int dma_ch); | |
63 | ||
64 | #endif /* _ASM_ARCH_DMA_H */ |