Tejun Heo wrote:
Hello, Kevin.
Kevin Hilman wrote:
Tejun,
A while back you provided a patch for sata_sil to use PCI IO space since
so that it can work on hardware that doesn't support byte-aligned MMIO.
I'd like to see a fix for this pushed upstream, but IIRC, Jeff Garzik
prefers that the driver be fixed up to use 32-bit aligned MMIO instead
of making the driver use IO space.
If you can point me in the right direction, as to where the
byte-alignement assumtions are, I can fix up the driver and test it on
my hardware.
Byte-aligned IO accesses are in the default ATA operations -
ata_tf_load/read, ata_check_status, ata_exec_command,
ata_std_dev_select, all the bmdma ops, etc... Basically, traditional
ATA interface is designed to use byte-aligned registers to operate.
sil3112 family of controllers allow all those ops implemented using
32bit ops, so you need to implement sata_sil's own methods to replace
those standard byte-aligned ops. I don't think it's gonna be too
difficult.
Oh, and just in case you don't have them already, the specs are
available at the following URL.
http://gkernel.sourceforge.net/specs/sii/
--
tejun
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