102 lines
2.7 KiB
C
102 lines
2.7 KiB
C
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/*
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* This file is part of the libpayload project.
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*
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* Copyright (C) 2008 Advanced Micro Devices, Inc.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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/**
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* @file armv7/timer.c
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* ARMv7 specific timer routines
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*/
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#include <libpayload.h>
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/**
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* @ingroup arch
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* Global variable containing the speed of the processor in KHz.
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*/
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u32 cpu_khz;
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/**
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* Calculate the speed of the processor for use in delays.
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*
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* @return The CPU speed in kHz.
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*/
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unsigned int get_cpu_speed(void)
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{
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/* FIXME */
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cpu_khz = 1000000U;
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return cpu_khz;
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}
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static inline void _delay(unsigned long long delta)
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{
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/* FIXME */
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}
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/**
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* Delay for a specified number of nanoseconds.
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*
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* @param n Number of nanoseconds to delay for.
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*/
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void ndelay(unsigned int n)
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{
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_delay((unsigned long long)n * cpu_khz / 1000000);
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}
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/**
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* Delay for a specified number of microseconds.
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*
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* @param n Number of microseconds to delay for.
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*/
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void udelay(unsigned int n)
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{
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_delay((unsigned long long)n * cpu_khz / 1000);
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}
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/**
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* Delay for a specified number of milliseconds.
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*
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* @param m Number of milliseconds to delay for.
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*/
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void mdelay(unsigned int m)
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{
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_delay((unsigned long long)m * cpu_khz);
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}
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/**
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* Delay for a specified number of seconds.
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*
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* @param s Number of seconds to delay for.
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*/
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void delay(unsigned int s)
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{
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int i;
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for (i=0; i<1000; i++)
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_delay((unsigned long long)s * cpu_khz);
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}
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