osd-contiki/platform/jn516x/dev/clock.c
2015-09-23 14:38:31 +02:00

251 lines
6.8 KiB
C

/*
* Copyright (c) 2014, SICS Swedish ICT.
* All rights reserved.
*
* 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 of the Institute 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 INSTITUTE 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 INSTITUTE 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.
*
* This file is part of the Contiki operating system.
*
*/
/**
* \file
* Clock implementation for NXP jn516x.
* \author
* Beshr Al Nahas <beshr@sics.se>
*
*/
#include <AppHardwareApi.h>
#include <PeripheralRegs.h>
#include "contiki.h"
#include "sys/energest.h"
#include "sys/clock.h"
#include "sys/etimer.h"
#include "rtimer-arch.h"
#include "dev/watchdog.h"
/**
* TickTimer will be used for RTIMER
* E_AHI_TIMER_1 will be used for ticking
**/
#define DEBUG 0
#if DEBUG
#include <stdio.h>
#define PRINTF(...) printf(__VA_ARGS__)
#else
#define PRINTF(...)
#endif
static volatile unsigned long seconds = 0;
static volatile uint8_t ticking = 0;
static volatile clock_time_t clock_ticks = 0;
/* last_tar is used for calculating clock_fine */
#define CLOCK_TIMER E_AHI_TIMER_1
#define CLOCK_TIMER_ISR_DEV E_AHI_DEVICE_TIMER1
/* 16Mhz / 2^7 = 125Khz */
#define CLOCK_PRESCALE 7
/* 10ms tick --> overflow after ~981/2 days */
#define CLOCK_INTERVAL (125 * 10)
#define MAX_TICKS (CLOCK_INTERVAL)
/*---------------------------------------------------------------------------*/
void
clockTimerISR(uint32 u32Device, uint32 u32ItemBitmap)
{
if(u32Device != CLOCK_TIMER_ISR_DEV) {
return;
}
ENERGEST_ON(ENERGEST_TYPE_IRQ);
watchdog_start();
clock_ticks++;
if(clock_ticks % CLOCK_CONF_SECOND == 0) {
++seconds;
energest_flush();
}
if(etimer_pending() && (etimer_next_expiration_time() - clock_ticks - 1) > MAX_TICKS) {
etimer_request_poll();
/* TODO exit low-power mode */
}
if(process_nevents() >= 0) {
/* TODO exit low-power mode */
}
watchdog_stop();
ENERGEST_OFF(ENERGEST_TYPE_IRQ);
}
/*---------------------------------------------------------------------------*/
static void
clock_timer_init(void)
{
vAHI_TimerEnable(CLOCK_TIMER, CLOCK_PRESCALE, 0, 1, 0);
vAHI_TimerClockSelect(CLOCK_TIMER, 0, 0);
vAHI_TimerConfigureOutputs(CLOCK_TIMER, 0, 1);
vAHI_TimerDIOControl(CLOCK_TIMER, 0);
#if (CLOCK_TIMER == E_AHI_TIMER_0)
vAHI_Timer0RegisterCallback(clockTimerISR);
#elif (CLOCK_TIMER == E_AHI_TIMER_1)
vAHI_Timer1RegisterCallback(clockTimerISR);
#endif
clock_ticks = 0;
vAHI_TimerStartRepeat(CLOCK_TIMER, 0, CLOCK_INTERVAL);
ticking = 1;
}
/*---------------------------------------------------------------------------*/
void
clock_init(void)
{
/* gMAC_u8MaxBuffers = 2; */
#ifdef JENNIC_CHIP_FAMILY_JN516x
/* Turn off debugger */
*(volatile uint32 *)0x020000a0 = 0;
#endif
/* system controller interrupts callback is disabled
* -- Only wake Interrupts --
*/
vAHI_SysCtrlRegisterCallback(0);
/* schedule clock tick interrupt */
clock_timer_init();
rtimer_init();
(void)u32AHI_Init();
bAHI_SetClockRate(E_AHI_XTAL_32MHZ);
/* Wait for oscillator to stabilise */
while(bAHI_GetClkSource() == 1) ;
while(bAHI_Clock32MHzStable() == 0) ;
vAHI_OptimiseWaitStates();
/* Turn on SPI master */
vREG_SysWrite(REG_SYS_PWR_CTRL, u32REG_SysRead(REG_SYS_PWR_CTRL)
| REG_SYSCTRL_PWRCTRL_SPIMEN_MASK);
}
/*---------------------------------------------------------------------------*/
clock_time_t
clock_time(void)
{
clock_time_t t1, t2;
do {
t1 = clock_ticks;
t2 = clock_ticks;
} while(t1 != t2);
return t1;
}
/*---------------------------------------------------------------------------*/
void
clock_set(clock_time_t clock, clock_time_t fclock)
{
clock_ticks = clock;
}
/*---------------------------------------------------------------------------*/
int
clock_fine_max(void)
{
return CLOCK_INTERVAL;
}
/*---------------------------------------------------------------------------*/
/**
* Delay the CPU for a multiple of 0.0625 us.
*/
void
clock_delay_usec(uint16_t dt)
{
volatile uint32_t t = u32AHI_TickTimerRead();
#define RTIMER_MAX_TICKS 0xffffffff
/* beware of wrapping */
if(RTIMER_MAX_TICKS - t < dt) {
while(u32AHI_TickTimerRead() < RTIMER_MAX_TICKS && u32AHI_TickTimerRead() != 0) ;
dt -= RTIMER_MAX_TICKS - t;
t = 0;
}
while(u32AHI_TickTimerRead() - t < dt) {
watchdog_periodic();
}
}
/*---------------------------------------------------------------------------*/
/**
* Delay the CPU for a multiple of 8 us.
*/
void
clock_delay(unsigned int i)
{
volatile uint32_t t = u16AHI_TimerReadCount(CLOCK_TIMER);
/* beware of wrapping */
if(MAX_TICKS - t < i) {
while(u16AHI_TimerReadCount(CLOCK_TIMER) < MAX_TICKS && u16AHI_TimerReadCount(CLOCK_TIMER) != 0) ;
i -= MAX_TICKS - t;
t = 0;
}
while(u16AHI_TimerReadCount(CLOCK_TIMER) - t < i) {
watchdog_periodic();
}
}
/*---------------------------------------------------------------------------*/
/**
* Wait for a multiple of 10 ms.
*
*/
void
clock_wait(clock_time_t t)
{
clock_time_t start;
start = clock_time();
while(clock_time() - start < (clock_time_t)t) {
watchdog_periodic();
}
}
/*---------------------------------------------------------------------------*/
void
clock_set_seconds(unsigned long sec)
{
seconds = sec;
}
/*---------------------------------------------------------------------------*/
unsigned long
clock_seconds(void)
{
unsigned long t1, t2;
do {
t1 = seconds;
t2 = seconds;
} while(t1 != t2);
return t1;
}
/*---------------------------------------------------------------------------*/
rtimer_clock_t
clock_counter(void)
{
return rtimer_arch_now();
}