This is the bitbanging SPI driver infrastructure.

If you want support for a particular piece of hardware, just fill in
a few functions in spi_bitbang_master_table. That's it.
On top of this, the RayeR SPI flasher should be supportable in ~20 LOC.

Tested, trace looks OK.

Signed-off-by: Carl-Daniel Hailfinger <c-d.hailfinger.devel.2006@gmx.net>
Acked-by: Uwe Hermann <uwe@hermann-uwe.de>


git-svn-id: svn://coreboot.org/flashrom/trunk@736 2b7e53f0-3cfb-0310-b3e9-8179ed1497e1