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authorMarcelo Tosatti <marcelo@kvack.org>2007-02-16 01:27:44 -0800
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2007-02-16 08:13:58 -0800
commit07190a08eef3666a8687070226c8d403c1d548b7 (patch)
tree20a9f7e9b6bf925a6721f88e438ec551fa8ce992 /include/asm-i386
parent5d8b34fdcb384161552d01ee8f34af5ff11f9684 (diff)
downloadop-kernel-dev-07190a08eef3666a8687070226c8d403c1d548b7.zip
op-kernel-dev-07190a08eef3666a8687070226c8d403c1d548b7.tar.gz
[PATCH] Mark TSC on GeodeLX reliable
The Geode can safely use the TSC for highres, since: 1) Does not support frequency scaling, 2) The TSC _does_ count when the CPU is halted. Furthermore, the Geode supports a mode called "suspension on halt", where Suspend mode (which interacts with the power management states) is entered. TSC counting during suspend mode is controlled by bit 8 of the Bus Controller Configuration Register #0 (thanks Tom!). 3) no SMP :) Check if "RTSC counts during suspension" and remove the requirement for verification, so the clocksource code can safely select it as an timesource for the highres timers subsystem. Signed-off-by: Marcelo Tosatti <marcelo@kvack.org> Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Ingo Molnar <mingo@elte.hu> Cc: john stultz <johnstul@us.ibm.com> Cc: Roman Zippel <zippel@linux-m68k.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'include/asm-i386')
-rw-r--r--include/asm-i386/msr.h3
1 files changed, 3 insertions, 0 deletions
diff --git a/include/asm-i386/msr.h b/include/asm-i386/msr.h
index 609a389..6db40d0 100644
--- a/include/asm-i386/msr.h
+++ b/include/asm-i386/msr.h
@@ -307,4 +307,7 @@ static inline void wrmsrl (unsigned long msr, unsigned long long val)
#define MSR_CORE_PERF_GLOBAL_CTRL 0x38f
#define MSR_CORE_PERF_GLOBAL_OVF_CTRL 0x390
+/* Geode defined MSRs */
+#define MSR_GEODE_BUSCONT_CONF0 0x1900
+
#endif /* __ASM_MSR_H */
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