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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/module.h>
#include <linux/init.h>
#include <linux/io.h>
#include <mach/cputype.h>
#include <mach/hardware.h>
#include <mach/psc.h>
#include <mach/mux.h>
#define DAVINCI_PWR_SLEEP_CNTRL_BASE 0x01C41000
/* PSC register offsets */
#define EPCPR 0x070
#define PTCMD 0x120
#define PTSTAT 0x128
#define PDSTAT 0x200
#define PDCTL1 0x304
#define MDSTAT 0x800
#define MDCTL 0xA00
#define MDSTAT_STATE_MASK 0x1f
/* Return nonzero iff the domain's clock is active */
int __init davinci_psc_is_clk_active(unsigned int id)
{
void __iomem *psc_base = IO_ADDRESS(DAVINCI_PWR_SLEEP_CNTRL_BASE);
u32 mdstat = __raw_readl(psc_base + MDSTAT + 4 * id);
/* if clocked, state can be "Enable" or "SyncReset" */
return mdstat & BIT(12);
}
/* Enable or disable a PSC domain */
void davinci_psc_config(unsigned int domain, unsigned int id, char enable)
{
u32 epcpr, ptcmd, ptstat, pdstat, pdctl1, mdstat, mdctl;
void __iomem *psc_base = IO_ADDRESS(DAVINCI_PWR_SLEEP_CNTRL_BASE);
u32 next_state = enable ? 0x3 : 0x2; /* 0x3 enables, 0x2 disables */
mdctl = __raw_readl(psc_base + MDCTL + 4 * id);
mdctl &= ~MDSTAT_STATE_MASK;
mdctl |= next_state;
__raw_writel(mdctl, psc_base + MDCTL + 4 * id);
pdstat = __raw_readl(psc_base + PDSTAT);
if ((pdstat & 0x00000001) == 0) {
pdctl1 = __raw_readl(psc_base + PDCTL1);
pdctl1 |= 0x1;
__raw_writel(pdctl1, psc_base + PDCTL1);
ptcmd = 1 << domain;
__raw_writel(ptcmd, psc_base + PTCMD);
do {
epcpr = __raw_readl(psc_base + EPCPR);
} while ((((epcpr >> domain) & 1) == 0));
pdctl1 = __raw_readl(psc_base + PDCTL1);
pdctl1 |= 0x100;
__raw_writel(pdctl1, psc_base + PDCTL1);
do {
ptstat = __raw_readl(psc_base +
PTSTAT);
} while (!(((ptstat >> domain) & 1) == 0));
} 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));
}
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