diff options
| author | Vineet Gupta <vgupta@synopsys.com> | 2015-03-07 14:36:09 +0300 |
|---|---|---|
| committer | Vineet Gupta <vgupta@synopsys.com> | 2015-06-19 15:39:24 +0300 |
| commit | 565a9b497c5103a91027d95b9f3392c035703774 (patch) | |
| tree | 00ee52063717660617951195d768f287c1c828a0 /arch/arc/kernel/time.c | |
| parent | 742f8af6cb35cb07882ee13aed8d09d6f1b1f15c (diff) | |
| download | linux-565a9b497c5103a91027d95b9f3392c035703774.tar.xz | |
ARC: RIP broken 64bit RTSC
Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
Diffstat (limited to 'arch/arc/kernel/time.c')
| -rw-r--r-- | arch/arc/kernel/time.c | 49 |
1 files changed, 1 insertions, 48 deletions
diff --git a/arch/arc/kernel/time.c b/arch/arc/kernel/time.c index dbe74f418019..9307f87f2572 100644 --- a/arch/arc/kernel/time.c +++ b/arch/arc/kernel/time.c @@ -26,6 +26,7 @@ * while TIMER1 for free running (clocksource) * * Newer ARC700 cores have 64bit clk fetching RTSC insn, preferred over TIMER1 + * which however is currently broken */ #include <linux/spinlock.h> @@ -59,52 +60,6 @@ /********** Clock Source Device *********/ -#ifdef CONFIG_ARC_HAS_RTSC - -int arc_counter_setup(void) -{ - /* - * For SMP this needs to be 0. However Kconfig glue doesn't - * enable this option for SMP configs - */ - return 1; -} - -static cycle_t arc_counter_read(struct clocksource *cs) -{ - unsigned long flags; - union { -#ifdef CONFIG_CPU_BIG_ENDIAN - struct { u32 high, low; }; -#else - struct { u32 low, high; }; -#endif - cycle_t full; - } stamp; - - flags = arch_local_irq_save(); - - __asm__ __volatile( - " .extCoreRegister tsch, 58, r, cannot_shortcut \n" - " rtsc %0, 0 \n" - " mov %1, 0 \n" - : "=r" (stamp.low), "=r" (stamp.high)); - - arch_local_irq_restore(flags); - - return stamp.full; -} - -static struct clocksource arc_counter = { - .name = "ARC RTSC", - .rating = 300, - .read = arc_counter_read, - .mask = CLOCKSOURCE_MASK(32), - .flags = CLOCK_SOURCE_IS_CONTINUOUS, -}; - -#else /* !CONFIG_ARC_HAS_RTSC */ - static bool is_usable_as_clocksource(void) { #ifdef CONFIG_SMP @@ -139,8 +94,6 @@ static struct clocksource arc_counter = { .flags = CLOCK_SOURCE_IS_CONTINUOUS, }; -#endif - /********** Clock Event Device *********/ /* |