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jcastillo |
/*
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* linux/include/asm-arm/arch-ebsa110/dma.h
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*
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* Architecture DMA routes
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*
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* Copyright (C) 1997.1998 Russell King
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*/
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#ifndef __ASM_ARCH_DMA_H
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#define __ASM_ARCH_DMA_H
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#ifdef KERNEL_ARCH_DMA
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static inline void arch_disable_dma (int dmanr)
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{
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printk (dma_str, "arch_disable_dma", dmanr);
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}
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static inline void arch_enable_dma (int dmanr)
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{
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printk (dma_str, "arch_enable_dma", dmanr);
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}
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static inline void arch_set_dma_addr (int dmanr, unsigned int addr)
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{
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printk (dma_str, "arch_set_dma_addr", dmanr);
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}
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static inline void arch_set_dma_count (int dmanr, unsigned int count)
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{
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printk (dma_str, "arch_set_dma_count", dmanr);
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}
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static inline void arch_set_dma_mode (int dmanr, char mode)
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{
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printk (dma_str, "arch_set_dma_mode", dmanr);
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}
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static inline int arch_dma_count (int dmanr)
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{
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printk (dma_str, "arch_dma_count", dmanr);
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return 0;
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}
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#endif
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/* enable/disable a specific DMA channel */
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extern void enable_dma(unsigned int dmanr);
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static __inline__ void disable_dma(unsigned int dmanr)
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{
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printk (dma_str, "disable_dma", dmanr);
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}
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/* Clear the 'DMA Pointer Flip Flop'.
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* Write 0 for LSB/MSB, 1 for MSB/LSB access.
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* Use this once to initialize the FF to a known state.
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* After that, keep track of it. :-)
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* --- In order to do that, the DMA routines below should ---
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* --- only be used while interrupts are disabled! ---
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*/
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static __inline__ void clear_dma_ff(unsigned int dmanr)
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{
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printk (dma_str, "clear_dma_ff", dmanr);
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}
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/* set mode (above) for a specific DMA channel */
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extern void set_dma_mode(unsigned int dmanr, char mode);
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/* Set only the page register bits of the transfer address.
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* This is used for successive transfers when we know the contents of
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* the lower 16 bits of the DMA current address register, but a 64k boundary
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* may have been crossed.
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*/
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static __inline__ void set_dma_page(unsigned int dmanr, char pagenr)
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{
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printk (dma_str, "set_dma_page", dmanr);
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}
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/* Set transfer address & page bits for specific DMA channel.
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* Assumes dma flipflop is clear.
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*/
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extern void set_dma_addr(unsigned int dmanr, unsigned int addr);
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/* Set transfer size for a specific DMA channel.
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*/
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extern void set_dma_count(unsigned int dmanr, unsigned int count);
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/* Get DMA residue count. After a DMA transfer, this
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* should return zero. Reading this while a DMA transfer is
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* still in progress will return unpredictable results.
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* If called before the channel has been used, it may return 1.
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* Otherwise, it returns the number of _bytes_ left to transfer.
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*
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* Assumes DMA flip-flop is clear.
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*/
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extern int get_dma_residue(unsigned int dmanr);
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#endif /* _ASM_ARCH_DMA_H */
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