c4d0a0ed8f
git-svn-id: svn://svn.rockbox.org/rockbox/trunk@14920 a1c6a512-1295-4272-9138-f99709370657
106 lines
2.9 KiB
C
106 lines
2.9 KiB
C
/***************************************************************************
|
|
* __________ __ ___.
|
|
* Open \______ \ ____ ____ | | _\_ |__ _______ ___
|
|
* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
|
|
* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
|
|
* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
|
|
* \/ \/ \/ \/ \/
|
|
* $Id$
|
|
*
|
|
* Copyright (C) 2007 by Karl Kurbjun
|
|
*
|
|
* All files in this archive are subject to the GNU General Public License.
|
|
* See the file COPYING in the source tree root for full license agreement.
|
|
*
|
|
* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
|
|
* KIND, either express or implied.
|
|
*
|
|
****************************************************************************/
|
|
|
|
#include "config.h"
|
|
#include "cpu.h"
|
|
#include "system.h"
|
|
#include "timer.h"
|
|
#include "logf.h"
|
|
|
|
/* GPB0/TOUT0 should already have been configured as output so that pin
|
|
should not be a functional pin and TIMER0 output unseen there */
|
|
void TIMER0(void)
|
|
{
|
|
if (pfn_timer != NULL)
|
|
pfn_timer();
|
|
IO_INTC_IRQ0 |= 1<<IRQ_TIMER0;
|
|
}
|
|
|
|
static void stop_timer(void)
|
|
{
|
|
IO_INTC_EINT0 &= ~(1<<IRQ_TIMER0);
|
|
|
|
IO_INTC_IRQ0 |= 1<<IRQ_TIMER0;
|
|
|
|
IO_TIMER0_TMMD = CONFIG_TIMER0_TMMD_STOP;
|
|
}
|
|
|
|
bool __timer_set(long cycles, bool start)
|
|
{
|
|
int oldlevel;
|
|
unsigned int divider;
|
|
/* taken from linux/arch/arm/mach-itdm320-20/time.c and timer-meg-fx.c */
|
|
|
|
/* Turn off all timers */
|
|
IO_TIMER0_TMMD = CONFIG_TIMER0_TMMD_STOP;
|
|
IO_TIMER1_TMMD = CONFIG_TIMER1_TMMD_STOP;
|
|
IO_TIMER2_TMMD = CONFIG_TIMER2_TMMD_STOP;
|
|
IO_TIMER3_TMMD = CONFIG_TIMER3_TMMD_STOP;
|
|
|
|
/* Find the minimum factor that puts the counter in range 1-65535 */
|
|
unsigned int prescaler = (cycles + 65534) / 65535;
|
|
|
|
/* Test this by writing 1's to registers to see how many bits we have */
|
|
/* Maximum divider setting is x / 1024 / 65536 = x / 67108864 */
|
|
if (start && pfn_unregister != NULL)
|
|
{
|
|
pfn_unregister();
|
|
pfn_unregister = NULL;
|
|
}
|
|
|
|
oldlevel = set_irq_level(HIGHEST_IRQ_LEVEL);
|
|
|
|
/* Max prescale is 1023+1 */
|
|
for (divider = 0; prescaler > 1024; prescaler >>= 1, divider++);
|
|
|
|
/* Setup the Prescalar */
|
|
IO_TIMER0_TMPRSCL = prescaler;
|
|
|
|
/* Setup the Divisor */
|
|
IO_TIMER0_TMDIV = divider;
|
|
|
|
set_irq_level(oldlevel);
|
|
|
|
return true;
|
|
}
|
|
|
|
bool __timer_register(void)
|
|
{
|
|
bool retval = true;
|
|
|
|
int oldstatus = set_interrupt_status(IRQ_FIQ_DISABLED, IRQ_FIQ_STATUS);
|
|
|
|
stop_timer();
|
|
|
|
/* Turn Timer0 to Free Run mode */
|
|
IO_TIMER0_TMMD = CONFIG_TIMER0_TMMD_FREE_RUN;
|
|
|
|
IO_INTC_EINT0 |= 1<<IRQ_TIMER0;
|
|
|
|
set_interrupt_status(oldstatus, IRQ_FIQ_STATUS);
|
|
|
|
return retval;
|
|
}
|
|
|
|
void __timer_unregister(void)
|
|
{
|
|
int oldstatus = set_interrupt_status(IRQ_FIQ_DISABLED, IRQ_FIQ_STATUS);
|
|
stop_timer();
|
|
set_interrupt_status(oldstatus, IRQ_FIQ_STATUS);
|
|
}
|