ata: pata_falcon: add data_swab option to byte-swap disk data

Some users of pata_falcon on Q40 have IDE disks in default
IDE little endian byte order, whereas legacy disks use
host-native big-endian byte order as on the Atari Falcon.

Add module parameter 'data_swab' to allow connecting drives
with non-native data byte order. Drives selected by the
data_swap bit mask will have their user data byte-swapped to
host byte order, i.e. 'pata_falcon.data_swab=2' will byte-swap
all user data on drive B, leaving data on drive A in native
byte order. On Q40, drives on a second IDE interface may be
added to the bit mask as bits 2 and 3.

Default setting is no byte swapping, i.e. compatibility with
the native Falcon or Q40 operating system disk format.

Cc: William R Sowerbutts <[email protected]>
Cc: Finn Thain <[email protected]>
Cc: Geert Uytterhoeven <[email protected]>
Tested-by: William R Sowerbutts <[email protected]>
Signed-off-by: Michael Schmitz <[email protected]>
Reviewed-by: Sergey Shtylyov <[email protected]>
Reviewed-by: Geert Uytterhoeven <[email protected]>
Signed-off-by: Damien Le Moal <[email protected]>

0 files changed, 0 insertions, 0 deletions