tree b732b892b56b9a1eb141b09827f8f104091c5e92
parent c4cad90f9e9dcb85afc5e75a02ae3522ed077296
author Benjamin Herrenschmidt <benh@kernel.crashing.org> 1401790059 +1000
committer Benjamin Herrenschmidt <benh@kernel.crashing.org> 1401938437 +1000

powerpc/powernv: Provide debugfs access to the LPC bus via OPAL

This provides debugfs files to access the LPC bus on Power8
non-virtualized using the appropriate OPAL firmware calls.

The usage is simple: one file per space (IO, MEM and FW),
lseek to the address and read/write the data. IO and MEM always
generate series of byte accesses. FW can generate word and dword
accesses if aligned properly.

Based on an original patch from Rob Lippert and reworked.

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>