serial: 8250_dw: Use 64-bit access for OCTEON.

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Although the existing code appears to work on most hardware, the
hardware designers tell us that 8-bit access to the registers is not
guaranteed to be reliable.  Also the OCTEON simulation environments
prohibit 8-bit accesses.

For these reasons, we use __raw_readq/__raw_writeq for OCTEON.  This
code is protected with #ifdef CONFIG_64BIT so it still builds under
configurations lacking readq/writeq.

We can get rid of the #ifdef __BIG_ENDIAN, as under 64-bit accesses,
OCTEON is byte order invariant.

Signed-off-by: David Daney <david.daney@cavium.com>
Signed-off-by: Aleksey Makarov <aleksey.makarov@auriga.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

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David Daney 2014-11-14 17:26:19 +03:00 • committed by Greg Kroah-Hartman

parent 93d94b37fd

commit bca2092d78

1 changed files with 41 additions and 14 deletions

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drivers/tty/serial/8250/8250_dw.c

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