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powerpc: Use feature bit for RTC presence rather than timebase presence

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All PowerPC CPUs other than the original PPC601 have a timebase
register rather than the "real-time clock" (RTC) register that the
PPC601 (and the original POWER and POWER2 CPUs) had.  Currently
we have a CPU feature bit to indicate the presence of the timebase,
but it makes more sense to use a bit to indicate the unusual
situation rather than the common situation.  This therefore defines
a CPU_FTR_USE_RTC bit in place of the CPU_FTR_USE_TB bit, and
arranges for it to be set on PPC601 systems.

Signed-off-by: Paul Mackerras <paulus@ozlabs.org>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
This commit is contained in:
Paul Mackerras
2018-03-20 08:46:11 +11:00
committed by Michael Ellerman
parent 7928b2cbe5
commit c0d64cf9fe
4 changed files with 47 additions and 55 deletions
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2
arch/powerpc/include/asm/time.h
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@@ -46,7 +46,7 @@ struct div_result {
/* Accessor functions for the timebase (RTC on 601) registers. */
/* If one day CONFIG_POWER is added just define __USE_RTC as 1 */
#ifdef CONFIG_6xx
#define __USE_RTC() (!cpu_has_feature(CPU_FTR_USE_TB))
#define __USE_RTC() (cpu_has_feature(CPU_FTR_USE_RTC))
#else
#define __USE_RTC() 0
#endif