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/*
* TI DaVinci Power and Sleep Controller (PSC)
*
* Copyright (C) 2006 Texas Instruments.
*
* 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., 675 Mass Ave, Cambridge, MA 02139, USA.
*
*/
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/io.h>
#include <mach/cputype.h>
#include <mach/psc.h>
#include "clock.h"
/* Return nonzero iff the domain's clock is active */
int __init davinci_psc_is_clk_active(unsigned int ctlr, unsigned int id)
{
void __iomem *psc_base;
u32 mdstat;
struct davinci_soc_info *soc_info = &davinci_soc_info;
if (!soc_info->psc_bases || (ctlr >= soc_info->psc_bases_num)) {
pr_warn("PSC: Bad psc data: 0x%x[%d]\n",
(int)soc_info->psc_bases, ctlr);
return 0;
}
psc_base = ioremap(soc_info->psc_bases[ctlr], SZ_4K);
mdstat = __raw_readl(psc_base + MDSTAT + 4 * id);
iounmap(psc_base);
/* if clocked, state can be "Enable" or "SyncReset" */
return mdstat & BIT(12);
}
/* Control "reset" line associated with PSC domain */
void davinci_psc_reset(unsigned int ctlr, unsigned int id, bool reset)
{
u32 mdctl;
void __iomem *psc_base;
struct davinci_soc_info *soc_info = &davinci_soc_info;
if (!soc_info->psc_bases || (ctlr >= soc_info->psc_bases_num)) {
pr_warn("PSC: Bad psc data: 0x%x[%d]\n",
(int)soc_info->psc_bases, ctlr);
return;
}
psc_base = ioremap(soc_info->psc_bases[ctlr], SZ_4K);
mdctl = readl(psc_base + MDCTL + 4 * id);
if (reset)
mdctl &= ~MDCTL_LRST;
else
mdctl |= MDCTL_LRST;
writel(mdctl, psc_base + MDCTL + 4 * id);
iounmap(psc_base);
}
/* Enable or disable a PSC domain */
void davinci_psc_config(unsigned int domain, unsigned int ctlr,
unsigned int id, bool enable, u32 flags)
{
u32 epcpr, ptcmd, ptstat, pdstat, pdctl, mdstat, mdctl;
void __iomem *psc_base;
struct davinci_soc_info *soc_info = &davinci_soc_info;
u32 next_state = PSC_STATE_ENABLE;
if (!soc_info->psc_bases || (ctlr >= soc_info->psc_bases_num)) {
pr_warn("PSC: Bad psc data: 0x%x[%d]\n",
(int)soc_info->psc_bases, ctlr);
return;
}
psc_base = ioremap(soc_info->psc_bases[ctlr], SZ_4K);
if (!enable) {
if (flags & PSC_SWRSTDISABLE)
next_state = PSC_STATE_SWRSTDISABLE;
else
next_state = PSC_STATE_DISABLE;
}
mdctl = __raw_readl(psc_base + MDCTL + 4 * id);
mdctl &= ~MDSTAT_STATE_MASK;
mdctl |= next_state;
if (flags & PSC_FORCE)
mdctl |= MDCTL_FORCE;
__raw_writel(mdctl, psc_base + MDCTL + 4 * id);
pdstat = __raw_readl(psc_base + PDSTAT + 4 * domain);
if ((pdstat & PDSTAT_STATE_MASK) == 0) {
pdctl = __raw_readl(psc_base + PDCTL + 4 * domain);
pdctl |= PDCTL_NEXT;
__raw_writel(pdctl, psc_base + PDCTL + 4 * domain);
ptcmd = 1 << domain;
__raw_writel(ptcmd, psc_base + PTCMD);
do {
epcpr = __raw_readl(psc_base + EPCPR);
} while ((((epcpr >> domain) & 1) == 0));
pdctl = __raw_readl(psc_base + PDCTL + 4 * domain);
pdctl |= PDCTL_EPCGOOD;
__raw_writel(pdctl, psc_base + PDCTL + 4 * domain);
} else {
ptcmd = 1 << domain;
__raw_writel(ptcmd, psc_base + PTCMD);
}
do {
ptstat = __raw_readl(psc_base + PTSTAT);
} while (!(((ptstat >> domain) & 1) == 0));
do {
mdstat = __raw_readl(psc_base + MDSTAT + 4 * id);
} while (!((mdstat & MDSTAT_STATE_MASK) == next_state));
iounmap(psc_base);
}
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