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 > - > To unsubscribe from this list: send the line "unsubscribe linux-m68k" in > the body of a message to majordomo@xxxxxxxxxxxxxxx > More majordomo info at http://vger.kernel.org/majordomo-info.html > - To unsubscribe from this list: send the line "unsubscribe linux-scsi" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
