tree 471ff98eae09173769e2f9d17f9b45d2a10fed6b
parent 78ff751f8e6a9446e9fb26b2bff0b8d3f8974cbd
author Finn Thain <fthain@telegraphics.com.au> 1560043151 +1000
committer Martin K. Petersen <martin.petersen@oracle.com> 1561059423 -0400

scsi: mac_scsi: Enable PDMA on Mac IIfx

Add support for Apple's custom "SCSI DMA" chip. This patch doesn't make use
of its DMA capability. Just the PDMA capability is sufficient to improve
sequential read throughput by a factor of 5.

Cc: Michael Schmitz <schmitzmic@gmail.com>
Cc: Joshua Thompson <funaho@jurai.org>
Cc: Geert Uytterhoeven <geert@linux-m68k.org>
Signed-off-by: Finn Thain <fthain@telegraphics.com.au>
Tested-by: Stan Johnson <userm57@yahoo.com>
Tested-by: Michael Schmitz <schmitzmic@gmail.com>
Acked-by: Geert Uytterhoeven <geert@linux-m68k.org>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>