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powerpc/8xx: mfspr SPRN_TBRx in lieu of mftb/mftbu is not supported

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Commit beb2dc0a7a breaks the MPC8xx which
seems to not support using mfspr SPRN_TBRx instead of mftb/mftbu
despite what is written in the reference manual.

This patch reverts to the use of mftb/mftbu when CONFIG_8xx is
selected.

Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr>
Signed-off-by: Scott Wood <scottwood@freescale.com>
This commit is contained in:
LEROY Christophe
2013-11-22 17:57:31 +01:00
committed by Scott Wood
parent cbf8a358be
commit ae2163be10
5 changed files with 37 additions and 0 deletions
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2
arch/powerpc/include/asm/ppc_asm.h
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@@ -366,6 +366,8 @@ BEGIN_FTR_SECTION_NESTED(96); \
cmpwi dest,0; \
beq- 90b; \
END_FTR_SECTION_NESTED(CPU_FTR_CELL_TB_BUG, CPU_FTR_CELL_TB_BUG, 96)
#elif defined(CONFIG_8xx)
#define MFTB(dest) mftb dest
#else
#define MFTB(dest) mfspr dest, SPRN_TBRL
#endif