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#ifndef __ASM_ARM_DMA_H

#define __ASM_ARM_DMA_H

typedef unsigned int dmach_t;

#include <linux/config.h>

#include <linux/spinlock.h>

#include <asm/system.h>

#include <asm/memory.h>

#include <asm/scatterlist.h>

#include <asm/arch/dma.h>

/*

 * DMA modes

 */

typedef unsigned int dmamode_t;

#define DMA_MODE_MASK   3

#define DMA_MODE_READ    0

#define DMA_MODE_WRITE   1

#define DMA_MODE_CASCADE 2

#define DMA_AUTOINIT     4

extern spinlock_t  dma_spin_lock;

static inline unsigned long claim_dma_lock(void)

{

        unsigned long flags;

        spin_lock_irqsave(&dma_spin_lock, flags);

        return flags;

}

static inline void release_dma_lock(unsigned long flags)

{

        spin_unlock_irqrestore(&dma_spin_lock, flags);

}

/* Clear the 'DMA Pointer Flip Flop'.

 * Write 0 for LSB/MSB, 1 for MSB/LSB access.

 */

#define clear_dma_ff(channel)

/* Set only the page register bits of the transfer address.

 *

 * NOTE: This is an architecture specific function, and should

 *       be hidden from the drivers

 */

extern void set_dma_page(dmach_t channel, char pagenr);

/* Request a DMA channel

 *

 * Some architectures may need to do allocate an interrupt

 */

extern int  request_dma(dmach_t channel, const char * device_id);

/* Free a DMA channel

 *

 * Some architectures may need to do free an interrupt

 */

extern void free_dma(dmach_t channel);

/* Enable DMA for this channel

 *

 * On some architectures, this may have other side effects like

 * enabling an interrupt and setting the DMA registers.

 */

extern void enable_dma(dmach_t channel);

/* Disable DMA for this channel

 *

 * On some architectures, this may have other side effects like

 * disabling an interrupt or whatever.

 */

extern void disable_dma(dmach_t channel);

/* Test whether the specified channel has an active DMA transfer

 */

extern int dma_channel_active(dmach_t channel);

/* Set the DMA scatter gather list for this channel

 *

 * This should not be called if a DMA channel is enabled,

 * especially since some DMA architectures don't update the

 * DMA address immediately, but defer it to the enable_dma().

 */

extern void set_dma_sg(dmach_t channel, struct scatterlist *sg, int nr_sg);

/* Set the DMA address for this channel

 *

 * This should not be called if a DMA channel is enabled,

 * especially since some DMA architectures don't update the

 * DMA address immediately, but defer it to the enable_dma().

 */

extern void set_dma_addr(dmach_t channel, unsigned long physaddr);

/* Set the DMA byte count for this channel

 *

 * This should not be called if a DMA channel is enabled,

 * especially since some DMA architectures don't update the

 * DMA count immediately, but defer it to the enable_dma().

 */

extern void set_dma_count(dmach_t channel, unsigned long count);

/* Set the transfer direction for this channel

 *

 * This should not be called if a DMA channel is enabled,

 * especially since some DMA architectures don't update the

 * DMA transfer direction immediately, but defer it to the

 * enable_dma().

 */

extern void set_dma_mode(dmach_t channel, dmamode_t mode);

/* Set the transfer speed for this channel

 */

extern void set_dma_speed(dmach_t channel, int cycle_ns);

/* Get DMA residue count. After a DMA transfer, this

 * should return zero. Reading this while a DMA transfer is

 * still in progress will return unpredictable results.

 * If called before the channel has been used, it may return 1.

 * Otherwise, it returns the number of _bytes_ left to transfer.

 */

extern int  get_dma_residue(dmach_t channel);

#ifndef NO_DMA

#define NO_DMA  255

#endif

#ifdef CONFIG_PCI

extern int isa_dma_bridge_buggy;

#else

#define isa_dma_bridge_buggy    (0)

#endif

#ifndef arch_adjust_zones

#define arch_adjust_zones(node,size,holes)

#endif

#endif /* _ARM_DMA_H */