On Fri, 4 Jan 2008, David Miller wrote:
From: Finn Thain <fthain@xxxxxxxxxxxxxxxxxxx>
Date: Fri, 4 Jan 2008 22:05:20 +1100 (EST)
I have a partially written replacement for mac_esp. Unlike the other
NCR53C9x drivers it needs PIO or pseudo DMA depending on the machine -- so
it is not as straight-forward as jazz_esp. The new esp_scsi core assumes
DMA and doesn't support asynch transfers. But I'll try to get it finished
before 2.6.25 is released.
It does actually support such things.
Does it? When I looked at this around 2.6.22, I found that esp_scsi would
always negotiate sync transfers if the target supported that. PIO cannot
do sync transfers, so I had to modify esp_scsi in order that the chip's
Synchronous Offset register was set to zero (asynch).
You can hide it completely your ->irq_pending() handler. Process any
pending pseudo DMA and return 0 until there is a pseudo DMA error or the
pseudo DMA is complete and the ESP is signalling an IRQ.
I didn't attempt any processing in irq_pending. I'll look into it.
Finn
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