idle.c

TI OMAP 1510上mcbsp的驱动程序

/*
 * dspapps/dsp/tokliBIOS/idle.c
 *
 * DSP idle TSK function
 *
 * Copyright (C) 2003 Nokia Corporation
 *
 * Written by Kiyotaka Takahashi <[e-mail]>
 * 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: idle.c
 * $Revision: 2.0
 * $Date: 2003/11/11
 *
 */

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

// #8: HOM_P, #9: HOM_R
#define go_SAM() \
	do {\
		asm(" BCLR #8, ST3_55;");\
		asm(" BCLR #9, ST3_55;");\
	} while(0)
#define go_HOM() \
	do {\
		asm(" BSET #8, ST3_55;");\
		asm(" BSET #9, ST3_55;");\
	} while(0)

static Uns	icr_mask = 0;
static Uns	icr_idle = 0;
#ifdef DEBUG_WAKEUP_CNT
static LgUns	wakeup_cnt = 0;
#endif /* DEBUG_WAKEUP_CNT */

/*
 * !!! note: this routine cannot be placed in external RAM !!!
 */

Void sleep_dsp(Void)
{
	Uns	intm_saved;

	while(1) {
		wdt_reflesh();
		if(icr_idle == 0)
			continue;

		wdt_stop();
//		timer1_stop();
		intm_saved = HWI_disable();
		go_SAM();
		outw(icr_idle, _ICR);
		go_HOM();
		asm(" IDLE;");

		if(!(icr_idle & _ICR_BIT_CPU_IDLE_DOMAIN)) {
			/*
			 * if CPU domain does not stop,
			 * we should stay here until
			 * any enabled interrupt comes.
			 * (if CPU stops, this is done by HW.)
			 */
			while(!(*_IFR0 & *_IER0) &&
			      !(*_IFR1 & *_IER1 & 0x00ff)) {}
		}

		go_SAM();
		outw(0, _ICR);
		asm(" IDLE;");
		HWI_restore(intm_saved);

//		timer1_start();
		wdt_start();
#ifdef DEBUG_WAKEUP_CNT
		wakeup_cnt++;
#endif /* DEBUG_WAKEUP_CNT */
	}
}

Uns get_icr_mask(Void)
{
	return icr_mask;
}

Void set_icr_mask(Uns val)
{
	icr_mask = val;

	/*
	 * ICR value when going idle
	 */
	icr_idle = (_ICR_BIT_EMIF_IDLE_DOMAIN |
		    _ICR_BIT_DPLL_IDLE_DOMAIN |
		    _ICR_BIT_PER_IDLE_DOMAIN |
		    _ICR_BIT_CACHE_IDLE_DOMAIN |
		    _ICR_BIT_DMA_IDLE_DOMAIN |
		    _ICR_BIT_CPU_IDLE_DOMAIN) & icr_mask;

	/*
	 * if CPU won't stop, DPLL shouldn't stop.
	 */
	if(!(icr_idle & _ICR_BIT_CPU_IDLE_DOMAIN))
		icr_idle &= ~_ICR_BIT_DPLL_IDLE_DOMAIN;

	/*
	 * FIXME:
	 * if DMA stays alive (DMA and DPLL domain doesn't stop),
	 * any other domain shouln't stop.
	 */
	if(!(icr_idle & _ICR_BIT_DPLL_IDLE_DOMAIN) &&
	   !(icr_idle & _ICR_BIT_DMA_IDLE_DOMAIN))
		icr_idle = 0;
}

Void init_icr(Void)
{
#if 0
	/*
	 * all domains stop when idle
	 */
	set_icr_mask(_ICR_BIT_EMIF_IDLE_DOMAIN |
		     _ICR_BIT_DPLL_IDLE_DOMAIN |
		     _ICR_BIT_PER_IDLE_DOMAIN |
		     _ICR_BIT_CACHE_IDLE_DOMAIN |
		     _ICR_BIT_DMA_IDLE_DOMAIN |
		     _ICR_BIT_CPU_IDLE_DOMAIN);
#else
	/*
	 * We do nothing here. GPP takes care about this.
	 */
	set_icr_mask(0);
#endif
}

#ifdef DEBUG_WAKEUP_CNT
LgUns get_wakeup_cnt(Void)
{
	return wakeup_cnt;
}

Void clear_wakeup_cnt(Void)
{
	wakeup_cnt = 0;
}
#endif /* DEBUG_WAKEUP_CNT */