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| author | LEROY Christophe <christophe.leroy@c-s.fr> | 2013-11-22 17:57:31 +0100 |
|---|---|---|
| committer | Scott Wood <scottwood@freescale.com> | 2013-11-22 16:56:48 -0600 |
| commit | ae2163be10ac6090e7aeed72591e2d7fabb1cdda (patch) | |
| tree | 1f6f4ba3beb2358c53bb951e3002c83de824163d /arch/powerpc/include/asm/reg.h | |
| parent | cbf8a358be27ceecea5bd44cf82ab01683fcc90c (diff) | |
| download | lwn-ae2163be10ac6090e7aeed72591e2d7fabb1cdda.tar.gz lwn-ae2163be10ac6090e7aeed72591e2d7fabb1cdda.zip | |
powerpc/8xx: mfspr SPRN_TBRx in lieu of mftb/mftbu is not supported
Commit beb2dc0a7a84be003ce54e98b95d65cc66e6e536 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>
Diffstat (limited to 'arch/powerpc/include/asm/reg.h')
| -rw-r--r-- | arch/powerpc/include/asm/reg.h | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/arch/powerpc/include/asm/reg.h b/arch/powerpc/include/asm/reg.h index 5c45787d551e..fa8388ed94c5 100644 --- a/arch/powerpc/include/asm/reg.h +++ b/arch/powerpc/include/asm/reg.h @@ -1174,12 +1174,19 @@ #else /* __powerpc64__ */ +#if defined(CONFIG_8xx) +#define mftbl() ({unsigned long rval; \ + asm volatile("mftbl %0" : "=r" (rval)); rval;}) +#define mftbu() ({unsigned long rval; \ + asm volatile("mftbu %0" : "=r" (rval)); rval;}) +#else #define mftbl() ({unsigned long rval; \ asm volatile("mfspr %0, %1" : "=r" (rval) : \ "i" (SPRN_TBRL)); rval;}) #define mftbu() ({unsigned long rval; \ asm volatile("mfspr %0, %1" : "=r" (rval) : \ "i" (SPRN_TBRU)); rval;}) +#endif #endif /* !__powerpc64__ */ #define mttbl(v) asm volatile("mttbl %0":: "r"(v)) |