dma.h
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上传日期:2013-04-10
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- /* $Id: dma.h,v 1.2 2001/05/09 12:17:42 johana Exp $
- * linux/include/asm/dma.h: Defines for using and allocating dma channels.
- */
- #ifndef _ASM_DMA_H
- #define _ASM_DMA_H
- /* it's useless on the Etrax, but unfortunately needed by the new
- bootmem allocator (but this should do it for this) */
- #define MAX_DMA_ADDRESS PAGE_OFFSET
- /* TODO: check nbr of channels on Etrax-100LX */
- #define MAX_DMA_CHANNELS 10
- /* dma0 and dma1 used for network (ethernet) */
- #define NETWORK_TX_DMA_NBR 0
- #define NETWORK_RX_DMA_NBR 1
- /* dma2 and dma3 shared by par0, scsi0, ser2 and ata */
- #define PAR0_TX_DMA_NBR 2
- #define PAR0_RX_DMA_NBR 3
- #define SCSI0_TX_DMA_NBR 2
- #define SCSI0_RX_DMA_NBR 3
- #define SER2_TX_DMA_NBR 2
- #define SER2_RX_DMA_NBR 3
- #define ATA_TX_DMA_NBR 2
- #define ATA_RX_DMA_NBR 3
- /* dma4 and dma5 shared by par1, scsi1, ser3 and extdma0 */
- #define PAR1_TX_DMA_NBR 4
- #define PAR1_RX_DMA_NBR 5
- #define SCSI1_TX_DMA_NBR 4
- #define SCSI1_RX_DMA_NBR 5
- #define SER3_TX_DMA_NBR 4
- #define SER3_RX_DMA_NBR 5
- #define EXTDMA0_TX_DMA_NBR 4
- #define EXTDMA0_RX_DMA_NBR 5
- /* dma6 and dma7 shared by ser0, extdma1 and mem2mem */
- #define SER0_TX_DMA_NBR 6
- #define SER0_RX_DMA_NBR 7
- #define EXTDMA1_TX_DMA_NBR 6
- #define EXTDMA1_RX_DMA_NBR 7
- #define MEM2MEM_TX_DMA_NBR 6
- #define MEM2MEM_RX_DMA_NBR 7
- /* dma8 and dma9 shared by ser1 and usb */
- #define SER1_TX_DMA_NBR 8
- #define SER1_RX_DMA_NBR 9
- #define USB_TX_DMA_NBR 8
- #define USB_RX_DMA_NBR 9
- /* These are in kernel/dma.c: */
- extern int request_dma(unsigned int dmanr, const char * device_id); /* reserve a DMA channel */
- extern void free_dma(unsigned int dmanr); /* release it */
- #endif /* _ASM_DMA_H */