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3 commits

Author SHA1 Message Date
Benjamin Herrenschmidt
d7a88c7eb4 powerpc/scom: Enable 64-bit addresses 
On P8, XSCOM addresses has a special "indirect" form that
requires more than 32-bits, so let's use u64 everywhere in
the code instead of u32.

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
 2013-11-06 14:13:49 +11:00
Benjamin Herrenschmidt
aaa63093dd powerpc/scom: Change scom_read() and scom_write() to return errors 
scom_read() now returns the read value via a pointer argument and
both functions return an int error code

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
 2013-10-11 16:53:34 +11:00
Benjamin Herrenschmidt
ab814b938d powerpc: Add SCOM infrastructure 
SCOM is a side-band configuration bus implemented on some processors.
This code provides a way for code to map and operate on devices via
SCOM, while the details of how that is implemented is left up to a
SCOM "controller" in the platform code.

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Michael Ellerman <michael@ellerman.id.au>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
 2011-04-20 17:01:19 +10:00