rt-thread/bsp/dm365/platform/psc.c

/*
 * File      : psc.c
 * This file is part of RT-Thread RTOS
 * COPYRIGHT (C) 2006, RT-Thread Development Team
 *
 *  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.,
 *  51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Change Logs:
 * Date           Author		Notes
 * 2010-11-13     weety		first version
 */

#include "dm36x.h"


/* ------------------------------------------------------------------------ *
 *  psc_change_state( id, state )                                           *
 *      id    = Domain #ID                                                  *
 *      state = ( ENABLE, DISABLE, SYNCRESET, RESET )                       *
 *              (   =3  ,   =2   ,    =1    ,   =0  )                       *
 * ------------------------------------------------------------------------ */
void psc_change_state(int id, int state)
{
	rt_uint32_t mdstat, mdctl;

	if (id > DAVINCI_DM365_LPSC_KALEIDO)
		return;

	mdstat = PSC_MDSTAT_BASE + (id * 4);
	mdctl = PSC_MDCTL_BASE + (id * 4);

    /*
     *  Step 0 - Ignore request if the state is already set as is
     */
    if ((readl(mdstat) & 0x1f) == state)
        return;

    /*
     *  Step 1 - Wait for PTSTAT.GOSTAT to clear
     */
    while (readl(PSC_PTSTAT) & 1) ;

    /*
     *  Step 2 - Set MDCTLx.NEXT to new state
     */
    writel(readl(mdctl) & (~0x1f), mdctl);
    writel(readl(mdctl) | state, mdctl);

    /*
     *  Step 3 - Start power transition ( set PTCMD.GO to 1 )
     */
    writel(readl(PSC_PTCMD) | 1, PSC_PTCMD);

    /*
     *  Step 4 - Wait for PTSTAT.GOSTAT to clear
     */
    while (readl(PSC_PTSTAT) & 1) ;
}