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authorIvan Kokshaysky <ink@jurassic.park.msu.ru>2009-01-16 00:51:19 +0300
committerLinus Torvalds <torvalds@linux-foundation.org>2009-01-16 03:39:40 +0300
commit5f7dc5d75076fd1c1fc6bc09f2467509d20db24a (patch)
treec105f8463607381acd7d02bdda75641b3f497e37 /arch/alpha/include/asm/machvec.h
parent2f88d151cb8e73587983d7feccd70672ff6730fe (diff)
downloadlinux-5f7dc5d75076fd1c1fc6bc09f2467509d20db24a.tar.xz
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/include/asm/machvec.h')
-rw-r--r--arch/alpha/include/asm/machvec.h4
1 files changed, 4 insertions, 0 deletions
diff --git a/arch/alpha/include/asm/machvec.h b/arch/alpha/include/asm/machvec.h
index a86c083cdf7f..fea4ea75b79d 100644
--- a/arch/alpha/include/asm/machvec.h
+++ b/arch/alpha/include/asm/machvec.h
@@ -21,6 +21,7 @@ struct pci_dev;
struct pci_ops;
struct pci_controller;
struct _alpha_agp_info;
+struct rtc_time;
struct alpha_machine_vector
{
@@ -94,6 +95,9 @@ struct alpha_machine_vector
struct _alpha_agp_info *(*agp_info)(void);
+ unsigned int (*rtc_get_time)(struct rtc_time *);
+ int (*rtc_set_time)(struct rtc_time *);
+
const char *vector_name;
/* NUMA information */