Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | #define MAX_DMA_ADDRESS 0xffffffff |
| 16 | |
| 17 | /* No DMA as the rest of the world see it */ |
| 18 | #define MAX_DMA_CHANNELS 0 |
| 19 | |
| 20 | /* |
| 21 | * Descriptor structure for PXA's DMA engine |
| 22 | * Note: this structure must always be aligned to a 16-byte boundary. |
| 23 | */ |
| 24 | |
| 25 | typedef struct pxa_dma_desc { |
| 26 | volatile u32 ddadr; /* Points to the next descriptor + flags */ |
| 27 | volatile u32 dsadr; /* DSADR value for the current transfer */ |
| 28 | volatile u32 dtadr; /* DTADR value for the current transfer */ |
| 29 | volatile u32 dcmd; /* DCMD value for the current transfer */ |
| 30 | } pxa_dma_desc; |
| 31 | |
| 32 | #if defined(CONFIG_PXA27x) |
| 33 | |
| 34 | #define PXA_DMA_CHANNELS 32 |
| 35 | #define PXA_DMA_NBCH(prio) ((prio == DMA_PRIO_LOW) ? 16 : 8) |
| 36 | |
| 37 | typedef enum { |
| 38 | DMA_PRIO_HIGH = 0, |
| 39 | DMA_PRIO_MEDIUM = 8, |
| 40 | DMA_PRIO_LOW = 16 |
| 41 | } pxa_dma_prio; |
| 42 | |
| 43 | #elif defined(CONFIG_PXA25x) |
| 44 | |
| 45 | #define PXA_DMA_CHANNELS 16 |
| 46 | #define PXA_DMA_NBCH(prio) ((prio == DMA_PRIO_LOW) ? 8 : 4) |
| 47 | |
| 48 | typedef enum { |
| 49 | DMA_PRIO_HIGH = 0, |
| 50 | DMA_PRIO_MEDIUM = 4, |
| 51 | DMA_PRIO_LOW = 8 |
| 52 | } pxa_dma_prio; |
| 53 | |
| 54 | #endif |
| 55 | |
| 56 | /* |
| 57 | * DMA registration |
| 58 | */ |
| 59 | |
| 60 | int pxa_request_dma (char *name, |
| 61 | pxa_dma_prio prio, |
| 62 | void (*irq_handler)(int, void *, struct pt_regs *), |
| 63 | void *data); |
| 64 | |
| 65 | void pxa_free_dma (int dma_ch); |
| 66 | |
| 67 | #endif /* _ASM_ARCH_DMA_H */ |