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/*
* 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) ;
}
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