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13 To do ISA style DMA you need to include two headers:
22 this is not present on all platforms make sure you construct your
38 or 128 KiB depending on which channel you use).
41 requirements you pass the flag GFP_DMA to kmalloc.
43 Unfortunately the memory available for ISA DMA is scarce so unless you
47 (This scarcity also means that you should allocate the buffer as
57 is really all you need. Remember that even though the DMA controller
79 The ability to use 16-bit or 8-bit transfers is _not_ up to you as a
88 Before you use any ISA DMA routines you need to claim the DMA lock
93 The first time you use the DMA controller you should call
95 controller that is used for the non-atomic operations. As long as you
96 (and everyone else) uses the locking functions then you only need to
99 Next, you tell the controller in which direction you intend to do the
100 transfer using set_dma_mode(). Currently you have the options
111 Once the DMA transfer is finished (or timed out) you should disable
150 controller being in a certain state then you have to restore these