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Date: Tue, 22 Dec 2009 20:04:14 -0800
From: john stultz <johnstul@...ibm.com>
To: lkml <linux-kernel@...r.kernel.org>
Cc: Mike Frysinger <vapier@...too.org>,
uclinux-dist-devel@...ckfin.uclinux.org
Subject: [RFC][PATCH 4/14] Convert blackfin to read/update_persistent_clock
This patch converts the blackfin architecture to use the generic
read_persistent_clock and update_persistent_clock interfaces, reducing
the amount of arch specific code we have to maintain, and allowing for
further cleanups in the future.
I have not built or tested this patch, so help from arch maintainers
would be appreciated.
Signed-off-by: John Stultz <johnstul@...ibm.com>
---
time-ts.c | 13 +++++++------
time.c | 39 ++++++---------------------------------
2 files changed, 13 insertions(+), 39 deletions(-)
Index: gettimeoffset/arch/blackfin/kernel/time-ts.c
===================================================================
--- gettimeoffset.orig/arch/blackfin/kernel/time-ts.c 2009-12-22 18:50:54.000000000 -0800
+++ gettimeoffset/arch/blackfin/kernel/time-ts.c 2009-12-22 18:51:13.000000000 -0800
@@ -348,9 +348,15 @@ static int __init bfin_clockevent_init(v
return 0;
}
-void __init time_init(void)
+void read_persistent_clock(struct timespec *ts)
{
time_t secs_since_1970 = (365 * 37 + 9) * 24 * 60 * 60; /* 1 Jan 2007 */
+ ts->tv_sec = secs_since_1970;
+ ts->tv_nsec = 0;
+}
+
+void __init time_init(void)
+{
#ifdef CONFIG_RTC_DRV_BFIN
/* [#2663] hack to filter junk RTC values that would cause
@@ -363,11 +369,6 @@ void __init time_init(void)
}
#endif
- /* Initialize xtime. From now on, xtime is updated with timer interrupts */
- xtime.tv_sec = secs_since_1970;
- xtime.tv_nsec = 0;
- set_normalized_timespec(&wall_to_monotonic, -xtime.tv_sec, -xtime.tv_nsec);
-
bfin_cs_cycles_init();
bfin_cs_gptimer0_init();
bfin_clockevent_init();
Index: gettimeoffset/arch/blackfin/kernel/time.c
===================================================================
--- gettimeoffset.orig/arch/blackfin/kernel/time.c 2009-12-22 18:50:54.000000000 -0800
+++ gettimeoffset/arch/blackfin/kernel/time.c 2009-12-22 18:51:13.000000000 -0800
@@ -112,11 +112,6 @@ u32 arch_gettimeoffset(void)
}
#endif
-static inline int set_rtc_mmss(unsigned long nowtime)
-{
- return 0;
-}
-
/*
* timer_interrupt() needs to keep up the real-time clock,
* as well as call the "do_timer()" routine every clocktick
@@ -126,29 +121,8 @@ __attribute__((l1_text))
#endif
irqreturn_t timer_interrupt(int irq, void *dummy)
{
- /* last time the cmos clock got updated */
- static long last_rtc_update;
-
write_seqlock(&xtime_lock);
do_timer(1);
-
- /*
- * If we have an externally synchronized Linux clock, then update
- * CMOS clock accordingly every ~11 minutes. Set_rtc_mmss() has to be
- * called as close as possible to 500 ms before the new second starts.
- */
- if (ntp_synced() &&
- xtime.tv_sec > last_rtc_update + 660 &&
- (xtime.tv_nsec / NSEC_PER_USEC) >=
- 500000 - ((unsigned)TICK_SIZE) / 2
- && (xtime.tv_nsec / NSEC_PER_USEC) <=
- 500000 + ((unsigned)TICK_SIZE) / 2) {
- if (set_rtc_mmss(xtime.tv_sec) == 0)
- last_rtc_update = xtime.tv_sec;
- else
- /* Do it again in 60s. */
- last_rtc_update = xtime.tv_sec - 600;
- }
write_sequnlock(&xtime_lock);
#ifdef CONFIG_IPIPE
@@ -161,10 +135,15 @@ irqreturn_t timer_interrupt(int irq, voi
return IRQ_HANDLED;
}
-void __init time_init(void)
+void read_persistent_clock(struct timespec *ts)
{
time_t secs_since_1970 = (365 * 37 + 9) * 24 * 60 * 60; /* 1 Jan 2007 */
+ ts->tv_sec = secs_since_1970;
+ ts->tv_nsec = 0;
+}
+void __init time_init(void)
+{
#ifdef CONFIG_RTC_DRV_BFIN
/* [#2663] hack to filter junk RTC values that would cause
* userspace to have to deal with time values greater than
@@ -176,11 +155,5 @@ void __init time_init(void)
}
#endif
- /* Initialize xtime. From now on, xtime is updated with timer interrupts */
- xtime.tv_sec = secs_since_1970;
- xtime.tv_nsec = 0;
-
- wall_to_monotonic.tv_sec = -xtime.tv_sec;
-
time_sched_init(timer_interrupt);
}
--
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