aboutsummaryrefslogtreecommitdiff
path: root/arch/alpha/kernel/machvec_impl.h
diff options
context:
space:
mode:
authorIvan Kokshaysky <ink@jurassic.park.msu.ru>2009-01-15 13:51:19 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2009-01-15 16:39:40 -0800
commit5f7dc5d75076fd1c1fc6bc09f2467509d20db24a (patch)
treec105f8463607381acd7d02bdda75641b3f497e37 /arch/alpha/kernel/machvec_impl.h
parent2f88d151cb8e73587983d7feccd70672ff6730fe (diff)
alpha: fix RTC on marvel
Unlike other alphas, marvel doesn't have real PC-style CMOS clock hardware - RTC accesses are emulated via PAL calls. Unfortunately, for unknown reason these calls work only on CPU #0. So current implementation for arbitrary CPU makes CMOS_READ/WRITE to be executed on CPU #0 via IPI. However, for obvious reason this doesn't work with standard get/set_rtc_time() functions, where a bunch of CMOS accesses is done with disabled interrupts. Solved by making the IPI calls for entire get/set_rtc_time() functions, not for individual CMOS accesses. Which is also a lot more effective performance-wise. The patch is largely based on the code from Jay Estabrook. My changes: - tweak asm-generic/rtc.h by adding a couple of #defines to avoid a massive code duplication in arch/alpha/include/asm/rtc.h; - sys_marvel.c: fix get/set_rtc_time() return values (Jay's FIXMEs). NOTE: this fixes *only* LIB_RTC drivers. Legacy (CONFIG_RTC) driver wont't work on marvel. Actually I think that we should just disable CONFIG_RTC on alpha (maybe in 2.6.30?), like most other arches - AFAIK, all modern distributions use LIB_RTC anyway. Signed-off-by: Ivan Kokshaysky <ink@jurassic.park.msu.ru> Cc: Richard Henderson <rth@twiddle.net> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'arch/alpha/kernel/machvec_impl.h')
-rw-r--r--arch/alpha/kernel/machvec_impl.h5
1 files changed, 4 insertions, 1 deletions
diff --git a/arch/alpha/kernel/machvec_impl.h b/arch/alpha/kernel/machvec_impl.h
index 466c9dff818..512685f7809 100644
--- a/arch/alpha/kernel/machvec_impl.h
+++ b/arch/alpha/kernel/machvec_impl.h
@@ -40,7 +40,10 @@
#define CAT1(x,y) x##y
#define CAT(x,y) CAT1(x,y)
-#define DO_DEFAULT_RTC .rtc_port = 0x70
+#define DO_DEFAULT_RTC \
+ .rtc_port = 0x70, \
+ .rtc_get_time = common_get_rtc_time, \
+ .rtc_set_time = common_set_rtc_time
#define DO_EV4_MMU \
.max_asn = EV4_MAX_ASN, \