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authorRichard Henderson <rth@twiddle.net>2013-07-14 02:49:45 +0400
committerMatt Turner <mattst88@gmail.com>2013-11-17 04:33:16 +0400
commit85d0b3a573d8b711ee0c96199ac24a0f3283ed68 (patch)
treee3ccfb8221bac388dc44fcc068ab1b32f67839a3 /drivers/rtc
parent7f3bbb82e0c371d6881129f776c90130ba66f051 (diff)
downloadlinux-85d0b3a573d8b711ee0c96199ac24a0f3283ed68.tar.xz
alpha: Reorganize rtc handling
Discontinue use of GENERIC_CMOS_UPDATE; rely on the RTC subsystem. The marvel platform requires that the rtc only be touched from the boot cpu. This had been partially implemented with hooks for get/set_rtc_time, but read/update_persistent_clock were not handled. Move the hooks from the machine_vec to a special rtc_class_ops struct. We had read_persistent_clock managing the epoch against which the rtc hw is based, but this didn't apply to get_rtc_time or set_rtc_time. This resulted in incorrect values when hwclock(8) gets involved. Allow the epoch to be set from the kernel command-line, overriding the autodetection, which is doomed to fail in 2020. Further, by implementing the rtc ioctl function, we can expose this epoch to userland. Elide the alarm functions that RTC_DRV_CMOS implements. This was highly questionable on Alpha, since the interrupt is used by the system timer. Signed-off-by: Richard Henderson <rth@twiddle.net>
Diffstat (limited to 'drivers/rtc')
-rw-r--r--drivers/rtc/Kconfig10
1 files changed, 9 insertions, 1 deletions
diff --git a/drivers/rtc/Kconfig b/drivers/rtc/Kconfig
index 15f166a470a7..007730222116 100644
--- a/drivers/rtc/Kconfig
+++ b/drivers/rtc/Kconfig
@@ -626,7 +626,7 @@ comment "Platform RTC drivers"
config RTC_DRV_CMOS
tristate "PC-style 'CMOS'"
- depends on X86 || ALPHA || ARM || M32R || ATARI || PPC || MIPS || SPARC64
+ depends on X86 || ARM || M32R || ATARI || PPC || MIPS || SPARC64
default y if X86
help
Say "yes" here to get direct support for the real time clock
@@ -643,6 +643,14 @@ config RTC_DRV_CMOS
This driver can also be built as a module. If so, the module
will be called rtc-cmos.
+config RTC_DRV_ALPHA
+ bool "Alpha PC-style CMOS"
+ depends on ALPHA
+ default y
+ help
+ Direct support for the real-time clock found on every Alpha
+ system, specifically MC146818 compatibles. If in doubt, say Y.
+
config RTC_DRV_VRTC
tristate "Virtual RTC for Intel MID platforms"
depends on X86_INTEL_MID