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/****************************************************************************
* arch/arm/src/calypso/calypso_timer.c
* Calypso DBB internal Timer Driver
*
* (C) 2010 by Harald Welte <laforge@gnumonks.org>
* (C) 2011 by Stefan Richter <ichgeh@l--putt.de>
*
* This source code is derivated from Osmocom-BB project and was
* relicensed as BSD with permission from original authors.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
* 3. Neither the name NuttX nor the names of its contributors may be
* used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*
**************************************************************************/
#include <stdio.h>
#include <stdint.h>
#include <nuttx/arch.h>
#include <arch/calypso/defines.h>
#include <arch/calypso/memory.h>
#include <arch/calypso/timer.h>
#include "up_arch.h"
#define BASE_ADDR_TIMER 0xfffe3800
#define TIMER2_OFFSET 0x3000
#define TIMER_REG(n, m) (((n)-1) ? (BASE_ADDR_TIMER + TIMER2_OFFSET + (m)) : (BASE_ADDR_TIMER + (m)))
enum timer_reg {
CNTL_TIMER = 0x00,
LOAD_TIMER = 0x02,
READ_TIMER = 0x04,
};
enum timer_ctl {
CNTL_START = (1 << 0),
CNTL_AUTO_RELOAD = (1 << 1),
CNTL_CLOCK_ENABLE = (1 << 5),
};
/* Regular Timers (1 and 2) */
void hwtimer_enable(int num, int on)
{
uint8_t ctl;
if (num < 1 || num > 2) {
printf("Unknown timer %u\n", num);
return;
}
ctl = getreg8(TIMER_REG(num, CNTL_TIMER));
if (on)
ctl |= CNTL_START|CNTL_CLOCK_ENABLE;
else
ctl &= ~CNTL_START;
putreg8(ctl, TIMER_REG(num, CNTL_TIMER));
}
void hwtimer_config(int num, uint8_t pre_scale, int auto_reload)
{
uint8_t ctl;
ctl = (pre_scale & 0x7) << 2;
if (auto_reload)
ctl |= CNTL_AUTO_RELOAD;
putreg8(ctl, TIMER_REG(num, CNTL_TIMER));
}
void hwtimer_load(int num, uint16_t val)
{
putreg16(val, TIMER_REG(num, LOAD_TIMER));
}
uint16_t hwtimer_read(int num)
{
uint8_t ctl = getreg8(TIMER_REG(num, CNTL_TIMER));
/* somehow a read results in an abort */
if ((ctl & (CNTL_START|CNTL_CLOCK_ENABLE)) != (CNTL_START|CNTL_CLOCK_ENABLE))
return 0xFFFF;
return getreg16(TIMER_REG(num, READ_TIMER));
}
/************************************************************
* Watchdog Timer
************************************************************/
#define BASE_ADDR_WDOG 0xfffff800
#define WDOG_REG(m) (BASE_ADDR_WDOG + m)
enum wdog_reg {
WD_CNTL_TIMER = CNTL_TIMER,
WD_LOAD_TIMER = LOAD_TIMER,
WD_READ_TIMER = 0x02,
WD_MODE = 0x04,
};
enum wdog_ctl {
WD_CTL_START = (1 << 7),
WD_CTL_AUTO_RELOAD = (1 << 8)
};
enum wdog_mode {
WD_MODE_DIS_ARM = 0xF5,
WD_MODE_DIS_CONFIRM = 0xA0,
WD_MODE_ENABLE = (1 << 15)
};
#define WD_CTL_PRESCALE(value) (((value)&0x07) << 9)
static void wdog_irq(__unused enum irq_nr nr)
{
puts("=> WATCHDOG\n");
}
void wdog_enable(int on)
{
if (!on) {
putreg16(WD_MODE_DIS_ARM, WDOG_REG(WD_MODE));
putreg16(WD_MODE_DIS_CONFIRM, WDOG_REG(WD_MODE));
}
}
void wdog_reset(void)
{
// enable watchdog
putreg16(WD_MODE_ENABLE, WDOG_REG(WD_MODE));
// force expiration
putreg16(0x0000, WDOG_REG(WD_LOAD_TIMER));
putreg16(0x0000, WDOG_REG(WD_LOAD_TIMER));
}
/************************************************************
* Global Functions
************************************************************/
/************************************************************
* Function: up_timerisr
*
* Description:
* The timer ISR will perform a variety of services for
* various portions of the systems.
*
************************************************************/
int up_timerisr(int irq, uint32_t *regs)
{
/* Process timer interrupt */
sched_process_timer();
return 0;
}
/************************************************************
* Function: up_timer_initialize
*
* Description:
* Setup Calypso HW timer 2 to cause system ticks.
*
* This function is called during start-up to initialize
* the timer interrupt.
*
************************************************************/
void up_timer_initialize(void)
{
up_disable_irq(IRQ_SYSTIMER);
/* The timer runs at 13MHz / 32, i.e. 406.25kHz */
/* 4062 ticks until expiry yields 100Hz interrupt */
hwtimer_load(2, 4062);
hwtimer_config(2, 0, 1);
hwtimer_enable(2, 1);
/* Attach and enable the timer interrupt */
irq_attach(IRQ_SYSTIMER, (xcpt_t)up_timerisr);
up_enable_irq(IRQ_SYSTIMER);
}
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