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/***************************************************************************
* __________ __ ___.
* Open \______ \ ____ ____ | | _\_ |__ _______ ___
* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
* \/ \/ \/ \/ \/
* $Id$
*
* Copyright (C) 2005 Jens Arnold
*
* This program 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 2
* of the License, or (at your option) any later version.
*
* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
* KIND, either express or implied.
*
****************************************************************************/
#include <stdbool.h>
#include "config.h"
#include "cpu.h"
#include "system.h"
#include "timer.h"
#include "logf.h"
static int timer_prio = -1;
void SHAREDBSS_ATTR (*pfn_timer)(void) = NULL; /* timer callback */
void SHAREDBSS_ATTR (*pfn_unregister)(void) = NULL; /* unregister callback */
#if defined CPU_PP
static long SHAREDBSS_ATTR cycles_new = 0;
#endif
#ifndef __TIMER_SET
/* Define these if not defined by target to make the #else cases compile
* even if the target doesn't have them implemented. */
#define __TIMER_SET(cycles, set) false
#define __TIMER_START() false
#define __TIMER_STOP(...)
#endif
/* interrupt handler */
#if defined(CPU_PP)
void TIMER2(void)
{
TIMER2_VAL; /* ACK interrupt */
if (cycles_new > 0)
{
TIMER2_CFG = 0xc0000000 | (cycles_new - 1);
cycles_new = 0;
}
if (pfn_timer != NULL)
{
cycles_new = -1;
/* "lock" the variable, in case timer_set_period()
* is called within pfn_timer() */
pfn_timer();
cycles_new = 0;
}
}
#endif /* CONFIG_CPU */
static bool timer_set(long cycles, bool start)
{
#if defined(CPU_PP)
if (cycles > 0x20000000 || cycles < 2)
return false;
if (start)
{
if (pfn_unregister != NULL)
{
pfn_unregister();
pfn_unregister = NULL;
}
CPU_INT_DIS = TIMER2_MASK;
COP_INT_DIS = TIMER2_MASK;
}
if (start || (cycles_new == -1)) /* within isr, cycles_new is "locked" */
TIMER2_CFG = 0xc0000000 | (cycles - 1); /* enable timer */
else
cycles_new = cycles;
return true;
#else
return __TIMER_SET(cycles, start);
#endif /* CONFIG_CPU */
}
/* Register a user timer, called every <cycles> TIMER_FREQ cycles */
bool timer_register(int reg_prio, void (*unregister_callback)(void),
long cycles, int int_prio, void (*timer_callback)(void)
IF_COP(, int core))
{
if (reg_prio <= timer_prio || cycles == 0)
return false;
#if CONFIG_CPU == SH7034
if (int_prio < 1 || int_prio > 15)
return false;
#endif
if (!timer_set(cycles, true))
return false;
pfn_timer = timer_callback;
pfn_unregister = unregister_callback;
timer_prio = reg_prio;
#if defined(CPU_PP)
/* unmask interrupt source */
#if NUM_CORES > 1
if (core == COP)
COP_INT_EN = TIMER2_MASK;
else
#endif
CPU_INT_EN = TIMER2_MASK;
return true;
#else
return __TIMER_START(int_prio);
#endif
/* Cover for targets that don't use all these */
(void)reg_prio;
(void)unregister_callback;
(void)cycles;
/* TODO: Implement for PortalPlayer and iFP (if possible) */
(void)int_prio;
(void)timer_callback;
}
bool timer_set_period(long cycles)
{
return timer_set(cycles, false);
}
void timer_unregister(void)
{
#if defined(CPU_PP)
TIMER2_CFG = 0; /* stop timer 2 */
CPU_INT_DIS = TIMER2_MASK;
COP_INT_DIS = TIMER2_MASK;
#else
__TIMER_STOP();
#endif
pfn_timer = NULL;
pfn_unregister = NULL;
timer_prio = -1;
}
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