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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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3
arch/powerpc/kernel/dt_cpu_ftrs.c
View File

@@ -54,8 +54,7 @@ struct dt_cpu_feature {
};
#define CPU_FTRS_BASE \
(CPU_FTR_USE_TB | \
CPU_FTR_LWSYNC | \
(CPU_FTR_LWSYNC | \
CPU_FTR_FPU_UNAVAILABLE |\
CPU_FTR_NODSISRALIGN |\
CPU_FTR_NOEXECUTE |\

12
arch/powerpc/kernel/vdso.c
View File

@@ -99,26 +99,28 @@ static struct vdso_patch_def vdso_patches[] = {
CPU_FTR_COHERENT_ICACHE, CPU_FTR_COHERENT_ICACHE,
"__kernel_sync_dicache", "__kernel_sync_dicache_p5"
},
#ifdef CONFIG_PPC32
{
CPU_FTR_USE_TB, 0,
CPU_FTR_USE_RTC, CPU_FTR_USE_RTC,
"__kernel_gettimeofday", NULL
},
{
CPU_FTR_USE_TB, 0,
CPU_FTR_USE_RTC, CPU_FTR_USE_RTC,
"__kernel_clock_gettime", NULL
},
{
CPU_FTR_USE_TB, 0,
CPU_FTR_USE_RTC, CPU_FTR_USE_RTC,
"__kernel_clock_getres", NULL
},
{
CPU_FTR_USE_TB, 0,
CPU_FTR_USE_RTC, CPU_FTR_USE_RTC,
"__kernel_get_tbfreq", NULL
},
{
CPU_FTR_USE_TB, 0,
CPU_FTR_USE_RTC, CPU_FTR_USE_RTC,
"__kernel_time", NULL
},
#endif
};
/*