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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/kernel.h>
- #include <asm/irq.h>
- #include <asm/system.h>
- #include <asm/spinlock.h>
- #include <asm/arch/dma.h>
-
- /*
- * DMA modes - we have two, IN and OUT
- */
- typedef unsigned int dmamode_t;
-
- #define DMA_MODE_MASK 1
-
- #define DMA_MODE_READ 0
- #define DMA_MODE_WRITE 1
- #define DMA_AUTOINIT 2
-
- typedef struct {
- unsigned long address;
- unsigned long length;
- } dmasg_t;
-
- extern const char dma_str[];
-
- extern spinlock_t dma_spin_lock;
-
- extern __inline__ unsigned long claim_dma_lock(void)
- {
- unsigned long flags;
- spin_lock_irqsave(&dma_spin_lock, flags);
- return flags;
- }
-
- extern __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.
- *
- * NOTE: This is an architecture specific function, and should
- * be hidden from the drivers.
- */
- #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 __inline__ void set_dma_page(dmach_t channel, char pagenr)
- {
- printk(dma_str, "set_dma_page", channel);
- }
-
- /* 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);
-
- /* 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, dmasg_t *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);
-
- /* 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_QUIRKS
- extern int isa_dma_bridge_buggy;
- #else
- #define isa_dma_bridge_buggy (0)
- #endif
-
- #endif /* _ARM_DMA_H */
-