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jcastillo |
#ifndef __ASM_ARM_DMA_H
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#define __ASM_ARM_DMA_H
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typedef unsigned int dmach_t;
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#include <asm/irq.h>
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#include <asm/arch/dma.h>
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typedef struct {
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unsigned long address;
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unsigned long length;
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} dmasg_t;
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extern const char dma_str[];
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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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*
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* NOTE: This is an architecture specific function, and should
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* be hidden from the drivers.
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*/
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#define clear_dma_ff(channel)
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/* Set only the page register bits of the transfer address.
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*
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* NOTE: This is an architecture specific function, and should
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* be hidden from the drivers
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*/
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static __inline__ void set_dma_page(dmach_t channel, char pagenr)
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{
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printk(dma_str, "set_dma_page", channel);
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}
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/* Request a DMA channel
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*
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* Some architectures may need to do allocate an interrupt
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*/
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extern int request_dma(dmach_t channel, const char * device_id);
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/* Free a DMA channel
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*
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* Some architectures may need to do free an interrupt
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*/
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extern void free_dma(dmach_t channel);
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/* Enable DMA for this channel
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*
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* On some architectures, this may have other side effects like
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* enabling an interrupt and setting the DMA registers.
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*/
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extern void enable_dma(dmach_t channel);
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/* Disable DMA for this channel
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*
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* On some architectures, this may have other side effects like
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* disabling an interrupt or whatever.
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*/
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extern void disable_dma(dmach_t channel);
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/* Set the DMA scatter gather list for this channel
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*
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* This should not be called if a DMA channel is enabled,
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* especially since some DMA architectures don't update the
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* DMA address immediately, but defer it to the enable_dma().
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*/
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extern void set_dma_sg(dmach_t channel, dmasg_t *sg, int nr_sg);
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/* Set the DMA address for this channel
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*
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* This should not be called if a DMA channel is enabled,
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* especially since some DMA architectures don't update the
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* DMA address immediately, but defer it to the enable_dma().
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*/
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extern void set_dma_addr(dmach_t channel, unsigned long physaddr);
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/* Set the DMA byte count for this channel
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*
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* This should not be called if a DMA channel is enabled,
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* especially since some DMA architectures don't update the
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* DMA count immediately, but defer it to the enable_dma().
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*/
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extern void set_dma_count(dmach_t channel, unsigned long count);
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/* Set the transfer direction for this channel
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*
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* This should not be called if a DMA channel is enabled,
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* especially since some DMA architectures don't update the
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* DMA transfer direction immediately, but defer it to the
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* enable_dma().
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*/
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extern void set_dma_mode(dmach_t channel, dmamode_t mode);
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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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extern int get_dma_residue(dmach_t channel);
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#ifndef NO_DMA
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#define NO_DMA 255
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#endif
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#endif /* _ARM_DMA_H */
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