643c0a1e0e
The old timrot setup API was very low-level and unfriendly. The new one makes in easier to select the frequency source. Use to simplify timer and kernel timer code. Change-Id: Iffcdf11c00e925be9ec8d9a4efc74b197b6bd2aa
129 lines
4.5 KiB
C
129 lines
4.5 KiB
C
/***************************************************************************
|
|
* __________ __ ___.
|
|
* Open \______ \ ____ ____ | | _\_ |__ _______ ___
|
|
* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
|
|
* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
|
|
* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
|
|
* \/ \/ \/ \/ \/
|
|
* $Id$
|
|
*
|
|
* Copyright (C) 2011 by Amaury Pouly
|
|
*
|
|
* 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 "timrot-imx233.h"
|
|
#include "clkctrl-imx233.h"
|
|
#include "string.h"
|
|
|
|
#include "regs/timrot.h"
|
|
|
|
static imx233_timer_fn_t timer_fns[4];
|
|
|
|
#define define_timer_irq(nr) \
|
|
void INT_TIMER##nr(void) \
|
|
{ \
|
|
if(timer_fns[nr]) \
|
|
timer_fns[nr](); \
|
|
BF_CLR(TIMROT_TIMCTRLn(nr), IRQ); \
|
|
}
|
|
|
|
define_timer_irq(0)
|
|
define_timer_irq(1)
|
|
define_timer_irq(2)
|
|
define_timer_irq(3)
|
|
|
|
void imx233_timrot_setup(unsigned timer_nr, bool reload, unsigned count,
|
|
unsigned src, unsigned prescale, bool polarity, imx233_timer_fn_t fn)
|
|
{
|
|
int oldstatus = disable_interrupt_save(IRQ_FIQ_STATUS);
|
|
/* only enable interrupt if function is set */
|
|
bool irq = fn != NULL;
|
|
timer_fns[timer_nr] = fn;
|
|
|
|
/* make sure we start from stop state */
|
|
BF_WR_ALL(TIMROT_TIMCTRLn(timer_nr), SELECT_V(NEVER_TICK), UPDATE(1));
|
|
/* write count and take effect immediately with UPDATE
|
|
* manual says count-1 for reload timers */
|
|
HW_TIMROT_TIMCOUNTn(timer_nr) = reload ? count - 1 : count;
|
|
/* start timer */
|
|
BF_WR_ALL(TIMROT_TIMCTRLn(timer_nr), SELECT(src), PRESCALE(prescale),
|
|
POLARITY(polarity), RELOAD(reload), IRQ(irq), IRQ_EN(irq));
|
|
imx233_icoll_enable_interrupt(INT_SRC_TIMER(timer_nr), irq);
|
|
|
|
restore_interrupt(oldstatus);
|
|
}
|
|
|
|
void imx233_timrot_set_priority(unsigned timer_nr, unsigned prio)
|
|
{
|
|
imx233_icoll_set_priority(INT_SRC_TIMER(timer_nr), prio);
|
|
}
|
|
|
|
static unsigned map_src(enum imx233_timrot_src_t src, unsigned *prescale)
|
|
{
|
|
*prescale = BV_TIMROT_TIMCTRLn_PRESCALE__DIV_BY_1;
|
|
switch(src)
|
|
{
|
|
case TIMER_SRC_24MHZ:
|
|
return BV_TIMROT_TIMCTRLn_SELECT__TICK_ALWAYS;
|
|
case TIMER_SRC_12MHZ:
|
|
*prescale = BV_TIMROT_TIMCTRLn_PRESCALE__DIV_BY_2;
|
|
return BV_TIMROT_TIMCTRLn_SELECT__TICK_ALWAYS;
|
|
case TIMER_SRC_6MHZ:
|
|
*prescale = BV_TIMROT_TIMCTRLn_PRESCALE__DIV_BY_4;
|
|
return BV_TIMROT_TIMCTRLn_SELECT__TICK_ALWAYS;
|
|
case TIMER_SRC_3MHZ:
|
|
*prescale = BV_TIMROT_TIMCTRLn_PRESCALE__DIV_BY_8;
|
|
return BV_TIMROT_TIMCTRLn_SELECT__TICK_ALWAYS;
|
|
case TIMER_SRC_32KHZ:
|
|
return BV_TIMROT_TIMCTRLn_SELECT__32KHZ_XTAL;
|
|
case TIMER_SRC_8KHZ:
|
|
return BV_TIMROT_TIMCTRLn_SELECT__8KHZ_XTAL;
|
|
case TIMER_SRC_4KHZ:
|
|
return BV_TIMROT_TIMCTRLn_SELECT__4KHZ_XTAL;
|
|
case TIMER_SRC_1KHZ:
|
|
return BV_TIMROT_TIMCTRLn_SELECT__1KHZ_XTAL;
|
|
case TIMER_SRC_STOP:
|
|
default:
|
|
return BV_TIMROT_TIMCTRLn_SELECT__NEVER_TICK;
|
|
}
|
|
}
|
|
|
|
void imx233_timrot_setup_simple(unsigned timer_nr, bool periodic, unsigned count,
|
|
enum imx233_timrot_src_t src, imx233_timer_fn_t fn)
|
|
{
|
|
unsigned prescale;
|
|
unsigned hw_src = map_src(src, &prescale);
|
|
imx233_timrot_setup(timer_nr, periodic, count, hw_src, prescale, false, fn);
|
|
}
|
|
|
|
unsigned imx233_timrot_get_count(unsigned timer_nr)
|
|
{
|
|
return BF_RD(TIMROT_TIMCOUNTn(timer_nr), RUNNING_COUNT);
|
|
}
|
|
|
|
struct imx233_timrot_info_t imx233_timrot_get_info(unsigned timer_nr)
|
|
{
|
|
struct imx233_timrot_info_t info;
|
|
memset(&info, 0, sizeof(info));
|
|
info.src = BF_RD(TIMROT_TIMCTRLn(timer_nr), SELECT);
|
|
info.prescale = BF_RD(TIMROT_TIMCTRLn(timer_nr), PRESCALE);
|
|
info.reload = BF_RD(TIMROT_TIMCTRLn(timer_nr), RELOAD);
|
|
info.polarity = BF_RD(TIMROT_TIMCTRLn(timer_nr), POLARITY);
|
|
info.fixed_count = BF_RD(TIMROT_TIMCOUNTn(timer_nr), FIXED_COUNT);
|
|
info.run_count = BF_RD(TIMROT_TIMCOUNTn(timer_nr), RUNNING_COUNT);
|
|
return info;
|
|
}
|
|
|
|
void imx233_timrot_init(void)
|
|
{
|
|
imx233_reset_block(&HW_TIMROT_ROTCTRL);
|
|
/* enable xtal path to timrot */
|
|
imx233_clkctrl_enable(CLK_TIMROT, true);
|
|
}
|