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Subject[PATCH] Convert blackfin to use arch_gettimeoffset()
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This patch converts blackfin to use GENERIC_TIME via the arch_getoffset()
infrastructure, reducing the amount of arch specific code we need to
maintain.

This patch applies on top of Linus' current -git tree (2.6.31-rc3).

I've taken my best swing at converting this, but I'm not 100% confident
I got it right. My cross-compiler is now out of date (gcc4.2) so I
wasn't able to check if it compiled. Any assistance from arch
maintainers or testers to get this merged would be great.

thanks
-john

Signed-off-by: John Stultz <johnstul@us.ibm.com>
---
Kconfig | 16 +++++++++++---
kernel/time.c | 63 +---------------------------------------------------------
2 files changed, 14 insertions(+), 65 deletions(-)

diff --git a/arch/blackfin/Kconfig b/arch/blackfin/Kconfig
index 7faa2f5..263b133 100644
--- a/arch/blackfin/Kconfig
+++ b/arch/blackfin/Kconfig
@@ -229,7 +229,7 @@ endchoice

config SMP
depends on BF561
- select GENERIC_TIME
+ select NO_ARCH_GETTIMEOFFSET
bool "Symmetric multi-processing support"
---help---
This enables support for systems with more than one CPU,
@@ -612,12 +612,13 @@ comment "Kernel Timer/Scheduler"
source kernel/Kconfig.hz

config GENERIC_TIME
- bool "Generic time"
- default y
+ def_bool y
+
+config NO_ARCH_GETTIMEOFFSET
+ def_bool n

config GENERIC_CLOCKEVENTS
bool "Generic clock events"
- depends on GENERIC_TIME
default y

choice
@@ -639,6 +640,7 @@ config CYCLES_CLOCKSOURCE
depends on GENERIC_CLOCKEVENTS
depends on !BFIN_SCRATCH_REG_CYCLES
depends on !SMP
+ select NO_ARCH_GETTIMEOFFSET
help
If you say Y here, you will enable support for using the 'cycles'
registers as a clock source. Doing so means you will be unable to
@@ -649,9 +651,15 @@ config CYCLES_CLOCKSOURCE
config GPTMR0_CLOCKSOURCE
bool "Use GPTimer0 as a clocksource (higher rating)"
select BFIN_GPTIMERS
+ select NO_ARCH_GETTIMEOFFSET
depends on GENERIC_CLOCKEVENTS
depends on !TICKSOURCE_GPTMR0

+config ARCH_USES_GETTIMEOFFSET
+ depends on !NO_ARCH_GETTIMEOFFSET
+ def_bool y
+
+
source kernel/time/Kconfig

comment "Misc"
diff --git a/arch/blackfin/kernel/time.c b/arch/blackfin/kernel/time.c
index adb54aa..e5069fe 100644
--- a/arch/blackfin/kernel/time.c
+++ b/arch/blackfin/kernel/time.c
@@ -81,11 +81,11 @@ time_sched_init(irqreturn_t(*timer_routine) (int, void *))
#endif
}

+#ifdef CONFIG_ARCH_USES_GETTIMEOFFSET
/*
* Should return useconds since last timer tick
*/
-#ifndef CONFIG_GENERIC_TIME
-static unsigned long gettimeoffset(void)
+u32 arch_gettimeoffset(void)
{
unsigned long offset;
unsigned long clocks_per_jiffy;
@@ -184,65 +184,6 @@ void __init time_init(void)
time_sched_init(timer_interrupt);
}

-#ifndef CONFIG_GENERIC_TIME
-void do_gettimeofday(struct timeval *tv)
-{
- unsigned long flags;
- unsigned long seq;
- unsigned long usec, sec;
-
- do {
- seq = read_seqbegin_irqsave(&xtime_lock, flags);
- usec = gettimeoffset();
- sec = xtime.tv_sec;
- usec += (xtime.tv_nsec / NSEC_PER_USEC);
- }
- while (read_seqretry_irqrestore(&xtime_lock, seq, flags));
-
- while (usec >= USEC_PER_SEC) {
- usec -= USEC_PER_SEC;
- sec++;
- }
-
- tv->tv_sec = sec;
- tv->tv_usec = usec;
-}
-EXPORT_SYMBOL(do_gettimeofday);
-
-int do_settimeofday(struct timespec *tv)
-{
- time_t wtm_sec, sec = tv->tv_sec;
- long wtm_nsec, nsec = tv->tv_nsec;
-
- if ((unsigned long)tv->tv_nsec >= NSEC_PER_SEC)
- return -EINVAL;
-
- write_seqlock_irq(&xtime_lock);
- /*
- * This is revolting. We need to set the xtime.tv_usec
- * correctly. However, the value in this location is
- * is value at the last tick.
- * Discover what correction gettimeofday
- * would have done, and then undo it!
- */
- nsec -= (gettimeoffset() * NSEC_PER_USEC);
-
- wtm_sec = wall_to_monotonic.tv_sec + (xtime.tv_sec - sec);
- wtm_nsec = wall_to_monotonic.tv_nsec + (xtime.tv_nsec - nsec);
-
- set_normalized_timespec(&xtime, sec, nsec);
- set_normalized_timespec(&wall_to_monotonic, wtm_sec, wtm_nsec);
-
- ntp_clear();
-
- write_sequnlock_irq(&xtime_lock);
- clock_was_set();
-
- return 0;
-}
-EXPORT_SYMBOL(do_settimeofday);
-#endif /* !CONFIG_GENERIC_TIME */
-
/*
* Scheduler clock - returns current time in nanosec units.
*/



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