From 1d880992fd8c8457a2d990ac6622cfd58fb1b261 Mon Sep 17 00:00:00 2001 From: Benjamin Herrenschmidt Date: Wed, 2 Jul 2014 15:36:20 +1000 Subject: Initial commit of Open Source release Signed-off-by: Benjamin Herrenschmidt --- include/timebase.h | 91 ++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 91 insertions(+) create mode 100644 include/timebase.h (limited to 'include/timebase.h') diff --git a/include/timebase.h b/include/timebase.h new file mode 100644 index 0000000..11ab126 --- /dev/null +++ b/include/timebase.h @@ -0,0 +1,91 @@ +/* Copyright 2013-2014 IBM Corp. + * + * Licensed under the Apache License, Version 2.0 (the "License"); + * you may not use this file except in compliance with the License. + * You may obtain a copy of the License at + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or + * implied. + * See the License for the specific language governing permissions and + * limitations under the License. + */ + +/* + * Timebase helpers. + * + * Note: Only use after the TODs are in sync ! + */ +#ifndef __TIME_H +#define __TIME_H + +#include + +static inline unsigned long mftb(void) +{ + unsigned long tb; + + /* We use a memory clobber to avoid this being + * moved in the instruction stream + */ + asm volatile("mftb %0" : "=r"(tb) : : "memory"); + return tb; +} + +enum tb_cmpval { + TB_ABEFOREB = -1, + TB_AEQUALB = 0, + TB_AAFTERB = 1 +}; + +static inline enum tb_cmpval tb_compare(unsigned long a, + unsigned long b) +{ + if (a == b) + return TB_AEQUALB; + return ((long)(b - a)) > 0 ? TB_ABEFOREB : TB_AAFTERB; +} + +/* Architected timebase */ +static const unsigned long tb_hz = 512000000; + +static inline unsigned long secs_to_tb(unsigned long secs) +{ + return secs * tb_hz; +} + +static inline unsigned long msecs_to_tb(unsigned long msecs) +{ + return msecs * (tb_hz / 1000); +} + +static inline unsigned long tb_to_msecs(unsigned long tb) +{ + return (tb * 1000) / tb_hz; +} + +static inline unsigned long usecs_to_tb(unsigned long usecs) +{ + return usecs * (tb_hz / 1000000); +} + +static inline unsigned long tb_to_usecs(unsigned long tb) +{ + return (tb * 1000000) / tb_hz; +} + +extern unsigned long timespec_to_tb(const struct timespec *ts); + +/* wait_poll - Wait a certain number of TB ticks while polling FSP */ +extern void time_wait(unsigned long duration); + +/* wait_poll_ms - Wait a certain number of milliseconds while polling FSP */ +extern void time_wait_ms(unsigned long ms); + +/* wait_poll_us - Wait a certain number of microseconds while polling FSP */ +extern void time_wait_us(unsigned long us); + +#endif /* __TIME_H */ -- cgit v1.1