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author | Ley Foon Tan <lftan@altera.com> | 2014-11-06 15:20:04 +0800 |
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committer | Ley Foon Tan <lftan@altera.com> | 2014-12-08 12:56:01 +0800 |
commit | 4182de9e6356c0ac567c072241f014476ffd9ce0 (patch) | |
tree | ed47fa1b1953b98d0130b5a7ac7d19add9d34ab1 /arch/nios2/lib | |
parent | 95acd4c7b69c9b250d901d154390ec4c8b7b51c1 (diff) | |
download | linux-stable-4182de9e6356c0ac567c072241f014476ffd9ce0.tar.gz linux-stable-4182de9e6356c0ac567c072241f014476ffd9ce0.tar.bz2 linux-stable-4182de9e6356c0ac567c072241f014476ffd9ce0.zip |
nios2: Time keeping
Add time keeping code for nios2.
Signed-off-by: Ley Foon Tan <lftan@altera.com>
Reviewed-by: Thomas Gleixner <tglx@linutronix.de>
Diffstat (limited to 'arch/nios2/lib')
-rw-r--r-- | arch/nios2/lib/delay.c | 52 |
1 files changed, 52 insertions, 0 deletions
diff --git a/arch/nios2/lib/delay.c b/arch/nios2/lib/delay.c new file mode 100644 index 000000000000..088119cd0cc5 --- /dev/null +++ b/arch/nios2/lib/delay.c @@ -0,0 +1,52 @@ +/* Copyright Altera Corporation (C) 2014. All rights reserved. + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License, version 2, + * as published by the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program. If not, see <http://www.gnu.org/licenses/>. + * + */ + +#include <linux/module.h> +#include <asm/delay.h> +#include <asm/param.h> +#include <asm/processor.h> +#include <asm/timex.h> + +void __delay(unsigned long cycles) +{ + cycles_t start = get_cycles(); + + while ((get_cycles() - start) < cycles) + cpu_relax(); +} +EXPORT_SYMBOL(__delay); + +void __const_udelay(unsigned long xloops) +{ + u64 loops; + + loops = (u64)xloops * loops_per_jiffy * HZ; + + __delay(loops >> 32); +} +EXPORT_SYMBOL(__const_udelay); + +void __udelay(unsigned long usecs) +{ + __const_udelay(usecs * 0x10C7UL); /* 2**32 / 1000000 (rounded up) */ +} +EXPORT_SYMBOL(__udelay); + +void __ndelay(unsigned long nsecs) +{ + __const_udelay(nsecs * 0x5UL); /* 2**32 / 1000000000 (rounded up) */ +} +EXPORT_SYMBOL(__ndelay); |