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/*
* This file is part of the libpayload project.
*
* Copyright (C) 2008 Advanced Micro Devices, Inc.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <libpayload.h>
#include <arch/rdtsc.h>
static unsigned int cpu_khz;
/* Calculate the speed of the processor for use in delays */
unsigned int get_cpu_speed(void)
{
unsigned long long start, end;
/* Set up the PPC port - disable the speaker,
* enable the T2 gate */
outb((inb(0x61) & ~0x02) | 0x01, 0x61);
/* Set the PIT to Mode 0, counter 2, word access */
outb(0xB0, 0x43);
/* Load the counter with 0xFFFF */
outb(0xFF, 0x42);
outb(0xFF, 0x42);
/* Read the number of ticks during the period */
start = rdtsc();
while(!(inb(0x61) & 0x20));
end = rdtsc();
/* The clock rate is 1193180 Hz
* the number of miliseconds for a period
* of 0xFFFF is 1193180 / (0xFFFF * 1000)
* or .0182. Multiply that by the number of
* measured clocks to get the khz value
*/
cpu_khz =
(unsigned int ) ((end - start) * 1193180U / (1000 * 0xFFFF));
}
/* Global delay functions */
static inline void _delay(unsigned int delta)
{
unsigned long long timeout = rdtsc() + delta;
while (rdtsc() < timeout);
}
void ndelay(unsigned int n)
{
_delay(n * cpu_khz / 1000000);
}
void mdelay(unsigned int m)
{
_delay(m * cpu_khz);
}
void delay(unsigned int s)
{
_delay(s * cpu_khz * 1000);
}
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