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| author | Christophe Leroy <christophe.leroy@c-s.fr> | 2017-08-08 13:58:50 +0200 |
|---|---|---|
| committer | Michael Ellerman <mpe@ellerman.id.au> | 2017-08-10 23:32:09 +1000 |
| commit | 72e4b2cdf07b4c43115f058ed74d694eab5d6454 (patch) | |
| tree | bce21f1e76f78f8843732cdc1c2988f5931891ec /arch/powerpc/include | |
| parent | de41ef6e4d70f2d30f96ca959fdde3200403d167 (diff) | |
| download | lwn-72e4b2cdf07b4c43115f058ed74d694eab5d6454.tar.gz lwn-72e4b2cdf07b4c43115f058ed74d694eab5d6454.zip | |
powerpc/time: refactor MFTB() to limit number of ifdefs
The 8xx cannot access the TBL and TBU registers using mfspr/mtspr
It must be accessed using mftb/mftbu
Due to this, there is a number of places with #ifdef CONFIG_8xx
This patch defines new macros MFTBL(x) and MFTBU(x) on the same model
as MFTB(x) and tries to make use of them as much as possible.
In arch/powerpc/include/asm/timex.h, we also remove the ifdef
for the asm() operands as the compiler doesn't mind unused operands
Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Diffstat (limited to 'arch/powerpc/include')
| -rw-r--r-- | arch/powerpc/include/asm/ppc_asm.h | 12 | ||||
| -rw-r--r-- | arch/powerpc/include/asm/timex.h | 4 |
2 files changed, 9 insertions, 7 deletions
diff --git a/arch/powerpc/include/asm/ppc_asm.h b/arch/powerpc/include/asm/ppc_asm.h index daeda2bbe12a..1d7ff3156a97 100644 --- a/arch/powerpc/include/asm/ppc_asm.h +++ b/arch/powerpc/include/asm/ppc_asm.h @@ -378,10 +378,16 @@ 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 +#define MFTB(dest) MFTBL(dest) +#endif + +#ifdef CONFIG_PPC_8xx +#define MFTBL(dest) mftb dest +#define MFTBU(dest) mftbu dest +#else +#define MFTBL(dest) mfspr dest, SPRN_TBRL +#define MFTBU(dest) mfspr dest, SPRN_TBRU #endif #ifndef CONFIG_SMP diff --git a/arch/powerpc/include/asm/timex.h b/arch/powerpc/include/asm/timex.h index 2cf846edb3fc..b467dbcb0fb7 100644 --- a/arch/powerpc/include/asm/timex.h +++ b/arch/powerpc/include/asm/timex.h @@ -45,11 +45,7 @@ static inline cycles_t get_cycles(void) " .long 0\n" " .long 0\n" ".previous" -#ifdef CONFIG_8xx - : "=r" (ret) : "i" (CPU_FTR_601)); -#else : "=r" (ret) : "i" (CPU_FTR_601), "i" (SPRN_TBRL)); -#endif return ret; #endif } |