mmio: Fix failure in bit field macro when accessing >30 bits

For bit fields with 31 bits (e.g: DEFINE_BITFIELD(MYREG, 30, 0) ),
the calculation of mask value will go overflow:
 "error: integer overflow in expression '-2147483648 - 1' of
  type 'int' results in '2147483647'".

And for bit fields with 32 bits (e.g: DEFINE_BITFIELD(MYREG, 31, 0) ),
the error will be:
 "error: left shift count >= width of type [-Werror=shift-count-overflow]"

To fix these issues, the bit field macros should always use unsigned
integers, and use 64bit integer when creating mask value.

Change-Id: Ie3cddf9df60b83de4e21243bfde6b79729fb06ef
Signed-off-by: Hung-Te Lin <hungte@chromium.org>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/40404
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Julius Werner <jwerner@chromium.org>

0 files changed, 0 insertions, 0 deletions