From 9ca8dbcc65cfc63d6f5ef3312a33184e1d726e00 Mon Sep 17 00:00:00 2001 From: Yunhong Jiang Date: Tue, 4 Aug 2015 12:17:53 -0700 Subject: Add the rt linux 4.1.3-rt3 as base Import the rt linux 4.1.3-rt3 as OPNFV kvm base. It's from git://git.kernel.org/pub/scm/linux/kernel/git/rt/linux-rt-devel.git linux-4.1.y-rt and the base is: commit 0917f823c59692d751951bf5ea699a2d1e2f26a2 Author: Sebastian Andrzej Siewior Date: Sat Jul 25 12:13:34 2015 +0200 Prepare v4.1.3-rt3 Signed-off-by: Sebastian Andrzej Siewior We lose all the git history this way and it's not good. We should apply another opnfv project repo in future. Change-Id: I87543d81c9df70d99c5001fbdf646b202c19f423 Signed-off-by: Yunhong Jiang --- kernel/arch/metag/lib/delay.c | 56 +++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 56 insertions(+) create mode 100644 kernel/arch/metag/lib/delay.c (limited to 'kernel/arch/metag/lib/delay.c') diff --git a/kernel/arch/metag/lib/delay.c b/kernel/arch/metag/lib/delay.c new file mode 100644 index 000000000..0b308f48b --- /dev/null +++ b/kernel/arch/metag/lib/delay.c @@ -0,0 +1,56 @@ +/* + * Precise Delay Loops for Meta + * + * Copyright (C) 1993 Linus Torvalds + * Copyright (C) 1997 Martin Mares + * Copyright (C) 2007,2009 Imagination Technologies Ltd. + * + */ + +#include +#include +#include + +#include +#include + +/* + * TXTACTCYC is only 24 bits, so on chips with fast clocks it will wrap + * many times per-second. If it does wrap __delay will return prematurely, + * but this is only likely with large delay values. + * + * We also can't implement read_current_timer() with TXTACTCYC due to + * this wrapping behaviour. + */ +#define rdtimer(t) t = __core_reg_get(TXTACTCYC) + +void __delay(unsigned long loops) +{ + unsigned long bclock, now; + + rdtimer(bclock); + do { + asm("NOP"); + rdtimer(now); + } while ((now-bclock) < loops); +} +EXPORT_SYMBOL(__delay); + +inline void __const_udelay(unsigned long xloops) +{ + u64 loops = (u64)xloops * (u64)loops_per_jiffy * HZ; + __delay(loops >> 32); +} +EXPORT_SYMBOL(__const_udelay); + +void __udelay(unsigned long usecs) +{ + __const_udelay(usecs * 0x000010c7); /* 2**32 / 1000000 (rounded up) */ +} +EXPORT_SYMBOL(__udelay); + +void __ndelay(unsigned long nsecs) +{ + __const_udelay(nsecs * 0x00005); /* 2**32 / 1000000000 (rounded up) */ +} +EXPORT_SYMBOL(__ndelay); -- cgit 1.2.3-korg