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| author | Jesper Nilsson <jesper.nilsson@axis.com> | 2010-07-30 17:33:07 +0200 |
|---|---|---|
| committer | Jesper Nilsson <jesper.nilsson@axis.com> | 2010-08-04 12:58:55 +0200 |
| commit | 60dbd6633178a8625ed71329da0167c6d50c559c (patch) | |
| tree | bcbc1004dfe356ce7cf30f183725dbbc9dad3e4f /arch/cris/Kconfig | |
| parent | 26bfeea38a4a5daf52c8f01c986ca8680bf1f6a1 (diff) | |
| download | lwn-60dbd6633178a8625ed71329da0167c6d50c559c.tar.gz lwn-60dbd6633178a8625ed71329da0167c6d50c559c.zip | |
CRIS: GENERIC_TIME fixes
GENERIC_TIME was not functional for CRIS, giving random backward
time jumps.
For CRISv32 implement a new clocksource using the free running counter
and ditch the arch_gettimeoffset.
The random time jumps still existed, but turned out to be the write_seqlock
which was missing around our do_timer() call.
So switch over to GENERIC_TIME using the clocksource for CRISv32.
CRISv10 doesn't have the free running counter needed for the
clocksource trick, but we can still use GENERIC_TIME with
arch_gettimeoffset.
Unfortunately, there were problems in using the prescaler register
to timer0 for the gettimeoffset calculation, so it is now ignored,
making our resolution worse by the tune of 40usec (0.4%) worst case.
At the same time, clean up some formatting and use NSEC_PER_SEC
instead of 1000000000.
Signed-off-by: Jesper Nilsson <jesper.nilsson@axis.com>
Diffstat (limited to 'arch/cris/Kconfig')
| -rw-r--r-- | arch/cris/Kconfig | 5 |
1 files changed, 4 insertions, 1 deletions
diff --git a/arch/cris/Kconfig b/arch/cris/Kconfig index e25bf4440b51..4827c72b9634 100644 --- a/arch/cris/Kconfig +++ b/arch/cris/Kconfig @@ -27,7 +27,7 @@ config GENERIC_CMOS_UPDATE def_bool y config ARCH_USES_GETTIMEOFFSET - def_bool y + def_bool n config GENERIC_IOMAP bool @@ -131,16 +131,19 @@ choice config ETRAX100LX bool "ETRAX-100LX-v1" + select ARCH_USES_GETTIMEOFFSET help Support version 1 of the ETRAX 100LX. config ETRAX100LX_V2 bool "ETRAX-100LX-v2" + select ARCH_USES_GETTIMEOFFSET help Support version 2 of the ETRAX 100LX. config SVINTO_SIM bool "ETRAX-100LX-for-xsim-simulator" + select ARCH_USES_GETTIMEOFFSET help Support the xsim ETRAX Simulator. |