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authorJesper Nilsson <jesper.nilsson@axis.com>2010-07-30 17:33:07 +0200
committerJesper Nilsson <jesper.nilsson@axis.com>2010-08-04 12:58:55 +0200
commit60dbd6633178a8625ed71329da0167c6d50c559c (patch)
treebcbc1004dfe356ce7cf30f183725dbbc9dad3e4f /arch/cris/Kconfig
parent26bfeea38a4a5daf52c8f01c986ca8680bf1f6a1 (diff)
downloadlinux-60dbd6633178a8625ed71329da0167c6d50c559c.tar.gz
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/Kconfig5
1 files changed, 4 insertions, 1 deletions
diff --git a/arch/cris/Kconfig b/arch/cris/Kconfig
index e25bf4440b5..4827c72b963 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.