At long last, revive the driver for m68k Amiga Zorro boards based on the Qlogic ESP SCSI chip, which were in-tree as separate drivers (blz1230.c, blz2060.c, cyberstorm.c, cyberstormII.c, fastlane.c) until the rewrite of the ESP core code after 2.6.x. A previous rewrite of the Zorro ESP SCSI drivers did not cope with tagged commands, and needed an ugly workaround to disable tagged queueing. After much poking around with config2 and config3 registers to no avail, the driver was never submitted. Inspired by Finn Thain's PDMA fixes to the Mac ESP driver, the same strategy of using PIO transfer for the short extended messages used to transfer the queue tag was used for the Zorro driver. Evidently, the DMA engine on the Zorro boards cannot handle short transfers of a few bytes only, and use of PIO for these is the only option. I have decided to ignore checkpatch warnings about long lines and the use of volatile in this patch - the long lines are due to excessive length macros for Zorro board IDs defined elsewhere in the kernel. I have decided to keep volatile qualifiers for DMA engine registers because I found gcc to miscompile the DMA setup routines (omitting multiple register stores) otherwise. -- 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
