2015-09-04 21:58:08 +08:00
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/*
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* File : psc.c
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* This file is part of RT-Thread RTOS
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* COPYRIGHT (C) 2006, RT-Thread Development Team
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Change Logs:
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* Date Author Notes
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* 2010-11-13 weety first version
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*/
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2015-09-04 12:30:20 +08:00
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#include "dm36x.h"
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/* ------------------------------------------------------------------------ *
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* psc_change_state( id, state ) *
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* id = Domain #ID *
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* state = ( ENABLE, DISABLE, SYNCRESET, RESET ) *
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* ( =3 , =2 , =1 , =0 ) *
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* ------------------------------------------------------------------------ */
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void psc_change_state(int id, int state)
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{
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rt_uint32_t mdstat, mdctl;
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if (id > DAVINCI_DM365_LPSC_KALEIDO)
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return;
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mdstat = PSC_MDSTAT_BASE + (id * 4);
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mdctl = PSC_MDCTL_BASE + (id * 4);
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/*
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* Step 0 - Ignore request if the state is already set as is
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*/
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if ((readl(mdstat) & 0x1f) == state)
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return;
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/*
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* Step 1 - Wait for PTSTAT.GOSTAT to clear
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*/
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while (readl(PSC_PTSTAT) & 1) ;
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/*
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* Step 2 - Set MDCTLx.NEXT to new state
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*/
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writel(readl(mdctl) & (~0x1f), mdctl);
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writel(readl(mdctl) | state, mdctl);
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/*
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* Step 3 - Start power transition ( set PTCMD.GO to 1 )
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*/
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writel(readl(PSC_PTCMD) | 1, PSC_PTCMD);
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/*
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* Step 4 - Wait for PTSTAT.GOSTAT to clear
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*/
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while (readl(PSC_PTSTAT) & 1) ;
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}
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