scsi: zorro_esp: New driver for Amiga Zorro NCR53C9x boards

New combined SCSI driver for all ESP based Zorro SCSI boards for m68k Amiga.

Code largely based on board specific parts of the old drivers (blz1230.c,
blz2060.c, cyberstorm.c, cyberstormII.c, fastlane.c which were removed after
the 2.6 kernel series for lack of maintenance) with contributions by Tuomas
Vainikka (TCQ bug tests and workaround) and Finn Thain (TCQ bugfix by use of
PIO in extended message in transfer).

New Kconfig option and Makefile entries for new Amiga Zorro ESP SCSI driver
included in this patch.

Use DMA transfers wherever possible, with board-specific DMA set-up functions
copied from the old driver code. Three byte reselection messages do appear to
cause DMA timeouts. So wire up a PIO transfer routine for these
instead. esp_reselect_with_tag explicitly sets
esp->cmd_block_dma as target address for the message bytes but PIO
requires a virtual address.  Substiute kernel virtual address
esp->cmd_block in PIO transfer call if DMA address is esp->cmd_block_dma
and phase is message in.

PIO code taken from mac_esp.c where the reselection timeout issue was debugged
and fixed first, with minor macro and function rename.
Signed-off-by: Michael Schmitz <schmitzmic@gmail.com>
Reviewed-by: Finn Thain <fthain@telegraphics.com.au>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Tested-by: Christian T. Steigies <cts@debian.org>
Tested-by: John Paul Adrian Glaubitz <glaubitz@physik.fu-berlin.de>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

drivers/scsi/Kconfig

@@ -1351,6 +1351,20 @@ config SCSI_ZORRO7XX
 	      accelerator card for the Amiga 1200,
 	    - the SCSI controller on the GVP Turbo 040/060 accelerator.
 
+config SCSI_ZORRO_ESP
+	tristate "Zorro ESP SCSI support"
+	depends on ZORRO && SCSI
+	select SCSI_SPI_ATTRS
+	help
+	  Support for various NCR53C9x (ESP) based SCSI controllers on Zorro
+	  expansion boards for the Amiga.
+	  This includes:
+	    - the Phase5 Blizzard 1230 II and IV SCSI controllers,
+	    - the Phase5 Blizzard 2060 SCSI controller,
+	    - the Phase5 Blizzard Cyberstorm and Cyberstorm II SCSI
+	      controllers,
+	    - the Fastlane Zorro III SCSI controller.
+
 config ATARI_SCSI
 	tristate "Atari native SCSI support"
 	depends on ATARI && SCSI

drivers/scsi/Makefile

@@ -48,6 +48,7 @@ obj-$(CONFIG_INFINIBAND_ISER) 	+= libiscsi.o
 obj-$(CONFIG_ISCSI_BOOT_SYSFS)	+= iscsi_boot_sysfs.o
 obj-$(CONFIG_SCSI_A4000T)	+= 53c700.o	a4000t.o
 obj-$(CONFIG_SCSI_ZORRO7XX)	+= 53c700.o	zorro7xx.o
+obj-$(CONFIG_SCSI_ZORRO_ESP)	+= esp_scsi.o	zorro_esp.o
 obj-$(CONFIG_A3000_SCSI)	+= a3000.o	wd33c93.o
 obj-$(CONFIG_A2091_SCSI)	+= a2091.o	wd33c93.o
 obj-$(CONFIG_GVP11_SCSI)	+= gvp11.o	wd33c93.o