wdt.c

TI OMAP 1510上mcbsp的驱动程序

/*
 * dspapps/dsp/task_testB/wdt.c
 *
 * DSP Watchdog timer module
 *
 * Copyright (C) 2003 Nokia Corporation
 *
 * Written by Toshihiro Kobayashi <[e-mail]>
 *
 * 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 program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
 *
 * $Id: wdt.c
 * $Revision: 2.0
 * $Date: 2003/11/11
 *
 */

#include <std.h>
#include "omap1510.h"
#include "mailbox.h"
#include "tokliBIOSlib.h"

#define __wdt_start() \
	do {\
		outw(inw(_CNTL_TIMER) | _CNTL_TIMER_BIT_ST,\
		     _CNTL_TIMER);\
	} while(0)
#define __wdt_stop() \
	do {\
		outw(inw(_CNTL_TIMER) & ~_CNTL_TIMER_BIT_ST,\
		     _CNTL_TIMER);\
	} while(0)

/*
 * WDT configuration (timer mode)
 */
Void init_wdt(Void)
{
	// Enable WDT clock
	outw(inw(_DSP_IDLECT2) | _DSP_IDLECT2_BIT_EN_WDTCK, _DSP_IDLECT2);
	
	// Start WDT with autoreload mode, expires in 19.57s.
	outw(0xFFFF, _LOAD_TIM);
	outw((inw(_CNTL_TIMER) & ~_CNTL_TIMER_BIT_PTV_MASK) |
	     _CNTL_TIMER_BIT_AR |
	     _CNTL_TIMER_BIT_PTV(7) |
	     _CNTL_TIMER_BIT_ST,
	     _CNTL_TIMER);

	// Enable Interrupt
	*_IER0 |= _IER0_BIT_WDGTIMER;
}

Void wdt_reflesh(Void)
{
	Uns	intm_saved;

	intm_saved = HWI_disable();
	__wdt_start();
	__wdt_stop();
	HWI_restore(intm_saved);
}

Void wdt_start(Void)
{
	__wdt_start();
}

Void wdt_stop(Void)
{
	__wdt_stop();
}

Void wdt_handle(Void)
{
	mbsend(mbcmd(MBCMD_WDT,0),0x0a21); // "!\n"
}