include/asm-arm/dma.h

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 1 #ifndef __ASM_ARM_DMA_H
 2 #define __ASM_ARM_DMA_H
 3
 4 typedefunsigned int dmach_t;
 5
 6 #include <linux/config.h>
 7 #include <linux/spinlock.h>
 8 #include <asm/system.h>
 9 #include <asm/memory.h>
 10 #include <asm/scatterlist.h>
 11 #include <asm/arch/dma.h>
 12
 13 /*
 14  * DMA modes
 15  */
 16 typedefunsigned int dmamode_t;
 17
 18 #define DMA_MODE_MASK 3
 19
 20 #define DMA_MODE_READ 0
 21 #define DMA_MODE_WRITE 1
 22 #define DMA_MODE_CASCADE 2
 23 #define DMA_AUTOINIT 4
 24
 25 extern spinlock_t dma_spin_lock;
 26
 27 extern __inline__ unsigned longclaim_dma_lock(void)
 28 {
 29 unsigned long flags;
 30 spin_lock_irqsave(&dma_spin_lock, flags);
 31 return flags;
 32 }
 33
 34 extern __inline__ voidrelease_dma_lock(unsigned long flags)
 35 {
 36 spin_unlock_irqrestore(&dma_spin_lock, flags);
 37 }
 38
 39 /* Clear the 'DMA Pointer Flip Flop'.
 40  * Write 0 for LSB/MSB, 1 for MSB/LSB access.
 41  */
 42 #define clear_dma_ff(channel)
 43
 44 /* Set only the page register bits of the transfer address.
 45  *
 46  * NOTE: This is an architecture specific function, and should
 47  * be hidden from the drivers
 48  */
 49 externvoidset_dma_page(dmach_t channel,char pagenr);
 50
 51 /* Request a DMA channel
 52  *
 53  * Some architectures may need to do allocate an interrupt
 54  */
 55 externintrequest_dma(dmach_t channel,const char* device_id);
 56
 57 /* Free a DMA channel
 58  *
 59  * Some architectures may need to do free an interrupt
 60  */
 61 externvoidfree_dma(dmach_t channel);
 62
 63 /* Enable DMA for this channel
 64  *
 65  * On some architectures, this may have other side effects like
 66  * enabling an interrupt and setting the DMA registers.
 67  */
 68 externvoidenable_dma(dmach_t channel);
 69
 70 /* Disable DMA for this channel
 71  *
 72  * On some architectures, this may have other side effects like
 73  * disabling an interrupt or whatever.
 74  */
 75 externvoiddisable_dma(dmach_t channel);
 76
 77 /* Set the DMA scatter gather list for this channel
 78  *
 79  * This should not be called if a DMA channel is enabled,
 80  * especially since some DMA architectures don't update the
 81  * DMA address immediately, but defer it to the enable_dma().
 82  */
 83 externvoidset_dma_sg(dmach_t channel,struct scatterlist *sg,int nr_sg);
 84
 85 /* Set the DMA address for this channel
 86  *
 87  * This should not be called if a DMA channel is enabled,
 88  * especially since some DMA architectures don't update the
 89  * DMA address immediately, but defer it to the enable_dma().
 90  */
 91 externvoidset_dma_addr(dmach_t channel,unsigned long physaddr);
 92
 93 /* Set the DMA byte count for this channel
 94  *
 95  * This should not be called if a DMA channel is enabled,
 96  * especially since some DMA architectures don't update the
 97  * DMA count immediately, but defer it to the enable_dma().
 98  */
 99 externvoidset_dma_count(dmach_t channel,unsigned long count);
 100
 101 /* Set the transfer direction for this channel
 102  *
 103  * This should not be called if a DMA channel is enabled,
 104  * especially since some DMA architectures don't update the
 105  * DMA transfer direction immediately, but defer it to the
 106  * enable_dma().
 107  */
 108 externvoidset_dma_mode(dmach_t channel, dmamode_t mode);
 109
 110 /* Set the transfer speed for this channel
 111  */
 112 externvoidset_dma_speed(dmach_t channel,int cycle_ns);
 113
 114 /* Get DMA residue count. After a DMA transfer, this
 115  * should return zero. Reading this while a DMA transfer is
 116  * still in progress will return unpredictable results.
 117  * If called before the channel has been used, it may return 1.
 118  * Otherwise, it returns the number of _bytes_ left to transfer.
 119  */
 120 externintget_dma_residue(dmach_t channel);
 121
 122 #ifndef NO_DMA
 123 #define NO_DMA 255
 124 #endif
 125
 126 #ifdef CONFIG_PCI
 127 externint isa_dma_bridge_buggy;
 128 #else
 129 #define isa_dma_bridge_buggy (0)
 130 #endif
 131
 132 #endif/* _ARM_DMA_H */