diff options
| author | Vineet Gupta <vgupta@synopsys.com> | 2015-03-07 17:06:09 +0530 |
|---|---|---|
| committer | Vineet Gupta <vgupta@synopsys.com> | 2015-06-19 18:09:24 +0530 |
| commit | 565a9b497c5103a91027d95b9f3392c035703774 (patch) | |
| tree | 00ee52063717660617951195d768f287c1c828a0 /arch/arc/kernel | |
| parent | 742f8af6cb35cb07882ee13aed8d09d6f1b1f15c (diff) | |
ARC: RIP broken 64bit RTSC
Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
Diffstat (limited to 'arch/arc/kernel')
| -rw-r--r-- | arch/arc/kernel/setup.c | 8 | ||||
| -rw-r--r-- | arch/arc/kernel/time.c | 49 |
2 files changed, 3 insertions, 54 deletions
diff --git a/arch/arc/kernel/setup.c b/arch/arc/kernel/setup.c index 1d167c6df8ca..5086c75681b5 100644 --- a/arch/arc/kernel/setup.c +++ b/arch/arc/kernel/setup.c @@ -180,10 +180,9 @@ static char *arc_cpu_mumbojumbo(int cpu_id, char *buf, int len) (unsigned int)(arc_get_core_freq() / 1000000), (unsigned int)(arc_get_core_freq() / 10000) % 100); - n += scnprintf(buf + n, len - n, "Timers\t\t: %s%s%s%s\nISA Extn\t: ", + n += scnprintf(buf + n, len - n, "Timers\t\t: %s%s\nISA Extn\t: ", IS_AVAIL1(cpu->timers.t0, "Timer0 "), - IS_AVAIL1(cpu->timers.t1, "Timer1 "), - IS_AVAIL2(cpu->timers.rtsc, "64-bit RTSC ", CONFIG_ARC_HAS_RTSC)); + IS_AVAIL1(cpu->timers.t1, "Timer1 ")); n += i = scnprintf(buf + n, len - n, "%s%s", IS_AVAIL2(atomic, "atomic ", CONFIG_ARC_HAS_LLSC)); @@ -254,9 +253,6 @@ static void arc_chk_core_config(void) if (!cpu->timers.t1) panic("Timer1 is not present!\n"); - if (IS_ENABLED(CONFIG_ARC_HAS_RTSC) && !cpu->timers.rtsc) - panic("RTSC is not present\n"); - #ifdef CONFIG_ARC_HAS_DCCM /* * DCCM can be arbit placed in hardware. 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 *********/ /* |