eisa_dma_enable(D3X)eisa_dma_enable(D3X)NAMEeisa_dma_enable - enable recognition of hardware requests on a DMA
channel
SYNOPSIS
#include <sys/eisa.h>
void eisa_dma_enable(uint_t adap, struct eisa_dma_cb, int chan, uchar_t mode);
Arguments
adap Bus adapter number (zero on an Indigo2).
eisa_dma_cb
Eisa DMA control block for the device.
chan Channel to be enabled.
mode Mode in which the channel is to be disabled.
DESCRIPTION
The eisa_dma_enable routine enables recognition of hardware requests on
the DMA channel chan.
After enabling the channel for a hardware initiated transfer, this
function calls the procedure proc() from the command block used to
program the DMA hardware start sequence. It will then sleep awaiting
completion of the dma operation specified by the command block, depending
on the value of mode. Note that mode must be EISA_DMA_NOSLEEP in Release
5.1.
The caller must ensure that it is acting on behalf of the channel owner,
and that it makes sense to release the channel. The caller must also
ensure that the channel is in use for hardware-initiated DMA transfers
and not software-initiated transfers.
Return Values
None
Level
Base or Interrupt
Notes
Does not sleep
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