138 lines
3.8 KiB
C
138 lines
3.8 KiB
C
/*
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* TI DaVinci Power and Sleep Controller (PSC)
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*
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* Copyright (C) 2006 Texas Instruments.
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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
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*
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*/
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#include <linux/kernel.h>
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#include <linux/init.h>
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#include <linux/io.h>
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#include <mach/cputype.h>
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#include <mach/psc.h>
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#include "clock.h"
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/* Return nonzero iff the domain's clock is active */
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int __init davinci_psc_is_clk_active(unsigned int ctlr, unsigned int id)
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{
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void __iomem *psc_base;
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u32 mdstat;
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struct davinci_soc_info *soc_info = &davinci_soc_info;
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if (!soc_info->psc_bases || (ctlr >= soc_info->psc_bases_num)) {
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pr_warn("PSC: Bad psc data: 0x%x[%d]\n",
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(int)soc_info->psc_bases, ctlr);
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return 0;
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}
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psc_base = ioremap(soc_info->psc_bases[ctlr], SZ_4K);
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mdstat = __raw_readl(psc_base + MDSTAT + 4 * id);
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iounmap(psc_base);
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/* if clocked, state can be "Enable" or "SyncReset" */
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return mdstat & BIT(12);
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}
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/* Control "reset" line associated with PSC domain */
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void davinci_psc_reset(unsigned int ctlr, unsigned int id, bool reset)
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{
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u32 mdctl;
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void __iomem *psc_base;
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struct davinci_soc_info *soc_info = &davinci_soc_info;
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if (!soc_info->psc_bases || (ctlr >= soc_info->psc_bases_num)) {
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pr_warn("PSC: Bad psc data: 0x%x[%d]\n",
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(int)soc_info->psc_bases, ctlr);
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return;
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}
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psc_base = ioremap(soc_info->psc_bases[ctlr], SZ_4K);
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mdctl = readl(psc_base + MDCTL + 4 * id);
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if (reset)
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mdctl &= ~MDCTL_LRST;
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else
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mdctl |= MDCTL_LRST;
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writel(mdctl, psc_base + MDCTL + 4 * id);
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iounmap(psc_base);
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}
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/* Enable or disable a PSC domain */
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void davinci_psc_config(unsigned int domain, unsigned int ctlr,
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unsigned int id, bool enable, u32 flags)
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{
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u32 epcpr, ptcmd, ptstat, pdstat, pdctl, mdstat, mdctl;
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void __iomem *psc_base;
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struct davinci_soc_info *soc_info = &davinci_soc_info;
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u32 next_state = PSC_STATE_ENABLE;
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if (!soc_info->psc_bases || (ctlr >= soc_info->psc_bases_num)) {
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pr_warn("PSC: Bad psc data: 0x%x[%d]\n",
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(int)soc_info->psc_bases, ctlr);
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return;
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}
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psc_base = ioremap(soc_info->psc_bases[ctlr], SZ_4K);
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if (!enable) {
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if (flags & PSC_SWRSTDISABLE)
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next_state = PSC_STATE_SWRSTDISABLE;
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else
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next_state = PSC_STATE_DISABLE;
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}
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mdctl = __raw_readl(psc_base + MDCTL + 4 * id);
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mdctl &= ~MDSTAT_STATE_MASK;
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mdctl |= next_state;
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if (flags & PSC_FORCE)
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mdctl |= MDCTL_FORCE;
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__raw_writel(mdctl, psc_base + MDCTL + 4 * id);
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pdstat = __raw_readl(psc_base + PDSTAT + 4 * domain);
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if ((pdstat & PDSTAT_STATE_MASK) == 0) {
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pdctl = __raw_readl(psc_base + PDCTL + 4 * domain);
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pdctl |= PDCTL_NEXT;
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__raw_writel(pdctl, psc_base + PDCTL + 4 * domain);
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ptcmd = 1 << domain;
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__raw_writel(ptcmd, psc_base + PTCMD);
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do {
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epcpr = __raw_readl(psc_base + EPCPR);
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} while ((((epcpr >> domain) & 1) == 0));
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pdctl = __raw_readl(psc_base + PDCTL + 4 * domain);
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pdctl |= PDCTL_EPCGOOD;
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__raw_writel(pdctl, psc_base + PDCTL + 4 * domain);
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} else {
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ptcmd = 1 << domain;
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__raw_writel(ptcmd, psc_base + PTCMD);
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}
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do {
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ptstat = __raw_readl(psc_base + PTSTAT);
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} while (!(((ptstat >> domain) & 1) == 0));
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do {
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mdstat = __raw_readl(psc_base + MDSTAT + 4 * id);
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} while (!((mdstat & MDSTAT_STATE_MASK) == next_state));
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iounmap(psc_base);
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}
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