109 lines
2.9 KiB
C
109 lines
2.9 KiB
C
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/***************************************************************************
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* __________ __ ___.
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* Open \______ \ ____ ____ | | _\_ |__ _______ ___
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* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
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* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
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* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
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* \/ \/ \/ \/ \/
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* $Id: $
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*
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* Copyright (C) 2007 by Karl Kurbjun
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*
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* All files in this archive are subject to the GNU General Public License.
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* See the file COPYING in the source tree root for full license agreement.
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*
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* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
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* KIND, either express or implied.
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*
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****************************************************************************/
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#include "config.h"
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#include "cpu.h"
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#include "system.h"
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#include "timer.h"
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#include "logf.h"
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/* GPB0/TOUT0 should already have been configured as output so that pin
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should not be a functional pin and TIMER0 output unseen there */
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void TIMER0(void)
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{
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if (pfn_timer != NULL)
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pfn_timer();
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}
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static void stop_timer(void)
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{
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}
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bool __timer_set(long cycles, bool start)
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{
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/* taken from linux/arch/arm/mach-itdm320-20/time.c and timer-meg-fx.c */
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/* Turn off all timers */
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/* outw(CONFIG_TIMER0_TMMD_STOP, IO_TIMER0_TMMD);
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outw(CONFIG_TIMER1_TMMD_STOP, IO_TIMER1_TMMD);
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outw(CONFIG_TIMER2_TMMD_STOP, IO_TIMER2_TMMD);
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outw(CONFIG_TIMER3_TMMD_STOP, IO_TIMER3_TMMD);
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*/
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/* Turn Timer0 to Free Run mode */
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// outw(CONFIG_TIMER0_TMMD_FREE_RUN, IO_TIMER0_TMMD);
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bool retval = false;
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/* Find the minimum factor that puts the counter in range 1-65535 */
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unsigned int prescaler = (cycles + 65534) / 65535;
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/* Test this by writing 1's to registers to see how many bits we have */
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/* Maximum divider setting is x / 1024 / 65536 = x / 67108864 */
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{
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int oldlevel;
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unsigned int divider;
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if (start && pfn_unregister != NULL)
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{
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pfn_unregister();
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pfn_unregister = NULL;
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}
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oldlevel = set_irq_level(HIGHEST_IRQ_LEVEL);
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/* Max prescale is 1023+1 */
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for (divider = 0; prescaler > 1024; prescaler >>= 1, divider++);
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/* Setup the Prescalar */
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outw(prescaler, IO_TIMER0_TMPRSCL);
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/* Setup the Divisor */
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outw(divider, IO_TIMER0_TMDIV);
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set_irq_level(oldlevel);
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retval = true;
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}
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return retval;
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}
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bool __timer_register(void)
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{
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bool retval = true;
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int oldstatus = set_interrupt_status(IRQ_FIQ_DISABLED, IRQ_FIQ_STATUS);
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stop_timer();
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/* Turn Timer0 to Free Run mode */
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outw(0x0002, IO_TIMER0_TMMD);
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set_interrupt_status(oldstatus, IRQ_FIQ_STATUS);
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return retval;
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}
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void __timer_unregister(void)
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{
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int oldstatus = set_interrupt_status(IRQ_FIQ_DISABLED, IRQ_FIQ_STATUS);
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stop_timer();
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set_interrupt_status(oldstatus, IRQ_FIQ_STATUS);
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}
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