34fb6906dd
The old could trigger an immediate IRQ if for example the count was 0 when setting up the timer: since the count was updared *after* clearing the IRQ, it could fire in between. Change-Id: I0357b201655bc0e56425ffb249ca807525f30217
86 lines
3 KiB
C
86 lines
3 KiB
C
/***************************************************************************
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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) 2011 by Amaury Pouly
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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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 "timrot-imx233.h"
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#include "clkctrl-imx233.h"
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#include "string.h"
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static imx233_timer_fn_t timer_fns[4];
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#define define_timer_irq(nr) \
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void INT_TIMER##nr(void) \
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{ \
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if(timer_fns[nr]) \
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timer_fns[nr](); \
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BF_CLRn(TIMROT_TIMCTRLn, nr, IRQ); \
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}
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define_timer_irq(0)
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define_timer_irq(1)
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define_timer_irq(2)
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define_timer_irq(3)
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void imx233_timrot_setup(unsigned timer_nr, bool reload, unsigned count,
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unsigned src, unsigned prescale, bool polarity, imx233_timer_fn_t fn)
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{
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int oldstatus = disable_interrupt_save(IRQ_FIQ_STATUS);
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/* only enable interrupt if function is set */
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bool irq = fn != NULL;
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timer_fns[timer_nr] = fn;
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/* make sure we start from stop state */
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HW_TIMROT_TIMCTRLn(timer_nr) = BF_OR2(TIMROT_TIMCTRLn,
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SELECT(BV_TIMROT_TIMCTRLn_SELECT__NEVER_TICK), UPDATE(1));
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/* write count and take effect immediately with UPDATE
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* manual says count-1 for reload timers */
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HW_TIMROT_TIMCOUNTn(timer_nr) = reload ? count - 1 : count;
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/* start timer */
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HW_TIMROT_TIMCTRLn(timer_nr) = BF_OR6(TIMROT_TIMCTRLn, SELECT(src),
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PRESCALE(prescale), POLARITY(polarity), RELOAD(reload), IRQ(irq),
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IRQ_EN(irq));
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imx233_icoll_enable_interrupt(INT_SRC_TIMER(timer_nr), irq);
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restore_interrupt(oldstatus);
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}
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void imx233_timrot_set_priority(unsigned timer_nr, unsigned prio)
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{
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imx233_icoll_set_priority(INT_SRC_TIMER(timer_nr), prio);
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}
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struct imx233_timrot_info_t imx233_timrot_get_info(unsigned timer_nr)
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{
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struct imx233_timrot_info_t info;
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memset(&info, 0, sizeof(info));
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info.src = BF_RDn(TIMROT_TIMCTRLn, timer_nr, SELECT);
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info.prescale = BF_RDn(TIMROT_TIMCTRLn, timer_nr, PRESCALE);
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info.reload = BF_RDn(TIMROT_TIMCTRLn, timer_nr, RELOAD);
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info.polarity = BF_RDn(TIMROT_TIMCTRLn, timer_nr, POLARITY);
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info.fixed_count = BF_RDn(TIMROT_TIMCOUNTn, timer_nr, FIXED_COUNT);
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info.run_count = BF_RDn(TIMROT_TIMCOUNTn, timer_nr, RUNNING_COUNT);
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return info;
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}
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void imx233_timrot_init(void)
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{
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imx233_reset_block(&HW_TIMROT_ROTCTRL);
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/* enable xtal path to timrot */
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imx233_clkctrl_enable(CLK_TIMROT, true);
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}
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