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atomport-timer.c
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/
atomport-timer.c
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/*
* Copyright (c) 2011, Himanshu Chauhan. All rights reserved.
*
* 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. No personal names or organizations' names associated with the
* Atomthreads project may be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE ATOMTHREADS PROJECT 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 PROJECT 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 <atomport-asm-macros.h>
#include <atomport.h>
#include <atom.h>
#include <atomport-timer.h>
/** CPU frequency in MHz */
#define CPU_FREQ_MHZ 100
/** Number of counter counter should increase to get required ticks */
#define COUNTER_TICK_COUNT ((1000000 * SYSTEM_TICKS_PER_SEC) / CPU_FREQ_MHZ)
unsigned long long jiffies;
void mips_cpu_timer_enable(void)
{
uint32_t sr = read_c0_status();
sr |= ((0x1UL << 7) << 8);
write_c0_status(sr);
uint32_t cause = read_c0_cause();
cause &= ~(0x1UL << 27);
write_c0_cause(cause);
write_c0_compare(read_c0_count() + COUNTER_TICK_COUNT);
}
void handle_mips_systick(void)
{
/* Call the interrupt entry routine */
atomIntEnter();
/* Call the OS system tick handler */
atomTimerTick();
/* Call the interrupt exit routine */
atomIntExit(TRUE);
write_c0_compare(read_c0_count() + COUNTER_TICK_COUNT);
}