include/asm-arm/dma.h

Name: Public Git Hosting - davej-history.git/blob - include/asm-arm/dma.h
Rating: 4.9 (3952 reviews)
 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/kernel.h>
 8 #include <linux/spinlock.h>
 9 #include <asm/irq.h>
 10 #include <asm/arch/dma.h>
 11
 12 /*
 13  * DMA modes
 14  */
 15 typedefunsigned int dmamode_t;
 16
 17 #define DMA_MODE_MASK 3
 18
 19 #define DMA_MODE_READ 0
 20 #define DMA_MODE_WRITE 1
 21 #define DMA_MODE_CASCADE 2
 22 #define DMA_AUTOINIT 4
 23
 24 typedefstruct{
 25 unsigned long address;
 26 unsigned long length;
 27 } dmasg_t;
 28
 29 externconst char dma_str[];
 30
 31 extern spinlock_t dma_spin_lock;
 32
 33 extern __inline__ unsigned longclaim_dma_lock(void)
 34 {
 35 unsigned long flags;
 36 spin_lock_irqsave(&dma_spin_lock, flags);
 37 return flags;
 38 }
 39
 40 extern __inline__ voidrelease_dma_lock(unsigned long flags)
 41 {
 42 spin_unlock_irqrestore(&dma_spin_lock, flags);
 43 }
 44
 45 /* Clear the 'DMA Pointer Flip Flop'.
 46  * Write 0 for LSB/MSB, 1 for MSB/LSB access.
 47  *
 48  * NOTE: This is an architecture specific function, and should
 49  * be hidden from the drivers.
 50  */
 51 #define clear_dma_ff(channel)
 52
 53 /* Set only the page register bits of the transfer address.
 54  *
 55  * NOTE: This is an architecture specific function, and should
 56  * be hidden from the drivers
 57  */
 58 extern __inline__ voidset_dma_page(dmach_t channel,char pagenr)
 59 {
 60 printk(dma_str,"set_dma_page", channel);
 61 }
 62
 63 /* Request a DMA channel
 64  *
 65  * Some architectures may need to do allocate an interrupt
 66  */
 67 externintrequest_dma(dmach_t channel,const char* device_id);
 68
 69 /* Free a DMA channel
 70  *
 71  * Some architectures may need to do free an interrupt
 72  */
 73 externvoidfree_dma(dmach_t channel);
 74
 75 /* Enable DMA for this channel
 76  *
 77  * On some architectures, this may have other side effects like
 78  * enabling an interrupt and setting the DMA registers.
 79  */
 80 externvoidenable_dma(dmach_t channel);
 81
 82 /* Disable DMA for this channel
 83  *
 84  * On some architectures, this may have other side effects like
 85  * disabling an interrupt or whatever.
 86  */
 87 externvoiddisable_dma(dmach_t channel);
 88
 89 /* Set the DMA scatter gather list for this channel
 90  *
 91  * This should not be called if a DMA channel is enabled,
 92  * especially since some DMA architectures don't update the
 93  * DMA address immediately, but defer it to the enable_dma().
 94  */
 95 externvoidset_dma_sg(dmach_t channel, dmasg_t *sg,int nr_sg);
 96
 97 /* Set the DMA address for this channel
 98  *
 99  * This should not be called if a DMA channel is enabled,
 100  * especially since some DMA architectures don't update the
 101  * DMA address immediately, but defer it to the enable_dma().
 102  */
 103 externvoidset_dma_addr(dmach_t channel,unsigned long physaddr);
 104
 105 /* Set the DMA byte count for this channel
 106  *
 107  * This should not be called if a DMA channel is enabled,
 108  * especially since some DMA architectures don't update the
 109  * DMA count immediately, but defer it to the enable_dma().
 110  */
 111 externvoidset_dma_count(dmach_t channel,unsigned long count);
 112
 113 /* Set the transfer direction for this channel
 114  *
 115  * This should not be called if a DMA channel is enabled,
 116  * especially since some DMA architectures don't update the
 117  * DMA transfer direction immediately, but defer it to the
 118  * enable_dma().
 119  */
 120 externvoidset_dma_mode(dmach_t channel, dmamode_t mode);
 121
 122 /* Set the transfer speed for this channel
 123  */
 124 externvoidset_dma_speed(dmach_t channel,int cycle_ns);
 125
 126 /* Get DMA residue count. After a DMA transfer, this
 127  * should return zero. Reading this while a DMA transfer is
 128  * still in progress will return unpredictable results.
 129  * If called before the channel has been used, it may return 1.
 130  * Otherwise, it returns the number of _bytes_ left to transfer.
 131  */
 132 externintget_dma_residue(dmach_t channel);
 133
 134 #ifndef NO_DMA
 135 #define NO_DMA 255
 136 #endif
 137
 138 #ifdef CONFIG_PCI
 139 externint isa_dma_bridge_buggy;
 140 #else
 141 #define isa_dma_bridge_buggy (0)
 142 #endif
 143
 144 #endif/* _ARM_DMA_H */