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/* -*- c++ -*- */
/*
* Copyright 2007 Free Software Foundation, Inc.
*
* This file is part of GNU Radio
*
* GNU Radio 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; either version 3, or (at your option)
* any later version.
*
* GNU Radio 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, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include <gcell/spu/gc_delay.h>
#include <gcell/compiler.h>
inline static void
gc_udelay_1us(void)
{
unsigned int i = 158;
do { // 20 clocks per iteration of the loop
asm ("nop $127; nop $127; nop $127; nop $127; nop $127");
asm ("nop $127; nop $127; nop $127; nop $127; nop $127");
asm ("nop $127; nop $127; nop $127; nop $127; nop $127");
asm ("nop $127; nop $127");
} while(--i != 0);
}
void
gc_udelay(unsigned int usecs)
{
unsigned int i;
for (i = 0; i < usecs; i++)
gc_udelay_1us();
}
void
gc_cdelay(unsigned int cpu_cycles)
{
if (cpu_cycles < 40) // roughly the amount of overhead
return;
cpu_cycles >>= 2; // about 4 cycles / loop
while (cpu_cycles-- != 0){
asm ("nop $127"); // keeps compiler from removing the loop
}
}
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