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author | Marc Zyngier <marc.zyngier@arm.com> | 2012-03-05 11:49:33 +0000 |
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committer | Catalin Marinas <catalin.marinas@arm.com> | 2012-09-17 13:42:18 +0100 |
commit | f27bb139c3876806a2c82e979d2dbbece44c66df (patch) | |
tree | b89925966ca77224f0605dc85521a2e55ab89c70 /arch/arm64/lib/delay.c | |
parent | 030896885ade0a17c8638e1ede8d3ca7099f0302 (diff) | |
download | op-kernel-dev-f27bb139c3876806a2c82e979d2dbbece44c66df.zip op-kernel-dev-f27bb139c3876806a2c82e979d2dbbece44c66df.tar.gz |
arm64: Miscellaneous library functions
This patch adds udelay, memory and bit operations together with the
ksyms exports.
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Acked-by: Tony Lindgren <tony@atomide.com>
Acked-by: Nicolas Pitre <nico@linaro.org>
Acked-by: Olof Johansson <olof@lixom.net>
Acked-by: Santosh Shilimkar <santosh.shilimkar@ti.com>
Diffstat (limited to 'arch/arm64/lib/delay.c')
-rw-r--r-- | arch/arm64/lib/delay.c | 55 |
1 files changed, 55 insertions, 0 deletions
diff --git a/arch/arm64/lib/delay.c b/arch/arm64/lib/delay.c new file mode 100644 index 0000000..dad4ec9 --- /dev/null +++ b/arch/arm64/lib/delay.c @@ -0,0 +1,55 @@ +/* + * Delay loops based on the OpenRISC implementation. + * + * Copyright (C) 2012 ARM Limited + * + * 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/>. + * + * Author: Will Deacon <will.deacon@arm.com> + */ + +#include <linux/delay.h> +#include <linux/init.h> +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/timex.h> + +void __delay(unsigned long cycles) +{ + cycles_t start = get_cycles(); + + while ((get_cycles() - start) < cycles) + cpu_relax(); +} +EXPORT_SYMBOL(__delay); + +inline void __const_udelay(unsigned long xloops) +{ + unsigned long loops; + + loops = 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); |