diff options
Diffstat (limited to 'arch/tile/lib/delay.c')
| -rw-r--r-- | arch/tile/lib/delay.c | 45 |
1 files changed, 45 insertions, 0 deletions
diff --git a/arch/tile/lib/delay.c b/arch/tile/lib/delay.c new file mode 100644 index 000000000..cdacdd11d --- /dev/null +++ b/arch/tile/lib/delay.c @@ -0,0 +1,45 @@ +/* + * Copyright 2010 Tilera Corporation. 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 + * as published by the Free Software Foundation, version 2. + * + * 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, GOOD TITLE or + * NON INFRINGEMENT. See the GNU General Public License for + * more details. + */ + +#include <linux/module.h> +#include <linux/delay.h> +#include <linux/thread_info.h> +#include <asm/timex.h> + +void __udelay(unsigned long usecs) +{ + if (usecs > ULONG_MAX / 1000) { + WARN_ON_ONCE(usecs > ULONG_MAX / 1000); + usecs = ULONG_MAX / 1000; + } + __ndelay(usecs * 1000); +} +EXPORT_SYMBOL(__udelay); + +void __ndelay(unsigned long nsecs) +{ + cycles_t target = get_cycles(); + target += ns2cycles(nsecs); + while (get_cycles() < target) + cpu_relax(); +} +EXPORT_SYMBOL(__ndelay); + +void __delay(unsigned long cycles) +{ + cycles_t target = get_cycles() + cycles; + while (get_cycles() < target) + cpu_relax(); +} +EXPORT_SYMBOL(__delay); |