/*
* 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/hardware.h>
#include <mach/psc.h>
#include <mach/mux.h>
/* PSC register offsets */
#define EPCPR 0x070
#define PTCMD 0x120
#define PTSTAT 0x128
#define PDSTAT 0x200
#define PDCTL1 0x304
#define MDSTAT 0x800
#define MDCTL 0xA00
/* System control register offsets */
#define VDD3P3V_PWDN 0x48
static void davinci_psc_mux(unsigned int id)
{
switch (id) {
case DAVINCI_LPSC_ATA:
davinci_mux_peripheral(DAVINCI_MUX_HDIREN, 1);
davinci_mux_peripheral(DAVINCI_MUX_ATAEN, 1);
break;
case DAVINCI_LPSC_MMC_SD:
/* VDD power manupulations are done in U-Boot for CPMAC
* so applies to MMC as well
*/
/*Set up the pull regiter for MMC */
davinci_writel(0, DAVINCI_SYSTEM_MODULE_BASE + VDD3P3V_PWDN);
davinci_mux_peripheral(DAVINCI_MUX_MSTK, 0);
break;
case DAVINCI_LPSC_I2C:
davinci_mux_peripheral(DAVINCI_MUX_I2C, 1);
break;
case DAVINCI_LPSC_McBSP:
davinci_mux_peripheral(DAVINCI_MUX_ASP, 1);
break;
default:
break;
}
}
/* 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, mdstat_mask;
mdctl = davinci_readl(DAVINCI_PWR_SLEEP_CNTRL_BASE + MDCTL + 4 * id);
if (enable)
mdctl |= 0x00000003; /* Enable Module */
else
mdctl &= 0xFFFFFFF2; /* Disable Module */
davinci_writel(mdctl, DAVINCI_PWR_SLEEP_CNTRL_BASE + MDCTL + 4 * id);
pdstat = davinci_readl(DAVINCI_PWR_SLEEP_CNTRL_BASE + PDSTAT);
if ((pdstat & 0x00000001) == 0) {
pdctl1 = davinci_readl(DAVINCI_PWR_SLEEP_CNTRL_BASE + PDCTL1);
pdctl1 |= 0x1;
davinci_writel(pdctl1, DAVINCI_PWR_SLEEP_CNTRL_BASE + PDCTL1);
ptcmd = 1 << domain;
davinci_writel(ptcmd, DAVINCI_PWR_SLEEP_CNTRL_BASE + PTCMD);
do {
epcpr = davinci_readl(DAVINCI_PWR_SLEEP_CNTRL_BASE +
EPCPR);
} while ((((epcpr >> domain) & 1) == 0));
pdctl1 = davinci_readl(DAVINCI_PWR_SLEEP_CNTRL_BASE + PDCTL1);
pdctl1 |= 0x100;
davinci_writel(pdctl1, DAVINCI_PWR_SLEEP_CNTRL_BASE + PDCTL1);
do {
ptstat = davinci_readl(DAVINCI_PWR_SLEEP_CNTRL_BASE +
PTSTAT);
} while (!(((ptstat >> domain) & 1) == 0));
} else {
ptcmd = 1 << domain;
davinci_writel(ptcmd, DAVINCI_PWR_SLEEP_CNTRL_BASE + PTCMD);
do {
ptstat = davinci_readl(DAVINCI_PWR_SLEEP_CNTRL_BASE +
PTSTAT);
} while (!(((ptstat >> domain) & 1) == 0));
}
if (enable)
mdstat_mask = 0x3;
else
mdstat_mask = 0x2;
do {
mdstat = davinci_readl(DAVINCI_PWR_SLEEP_CNTRL_BASE +
MDSTAT + 4 * id);
} while (!((mdstat & 0x0000001F) == mdstat_mask));
if (enable)
davinci_psc_mux(id);
}
void __init davinci_psc_init(void)
{
davinci_psc_config(DAVINCI_GPSC_ARMDOMAIN, DAVINCI_LPSC_VPSSMSTR, 1);
davinci_psc_config(DAVINCI_GPSC_ARMDOMAIN, DAVINCI_LPSC_VPSSSLV, 1);
davinci_psc_config(DAVINCI_GPSC_ARMDOMAIN, DAVINCI_LPSC_TPCC, 1);
davinci_psc_config(DAVINCI_GPSC_ARMDOMAIN, DAVINCI_LPSC_TPTC0, 1);
davinci_psc_config(DAVINCI_GPSC_ARMDOMAIN, DAVINCI_LPSC_TPTC1, 1);
davinci_psc_config(DAVINCI_GPSC_ARMDOMAIN, DAVINCI_LPSC_GPIO, 1);
/* Turn on WatchDog timer LPSC. Needed for RESET to work */
davinci_psc_config(DAVINCI_GPSC_ARMDOMAIN, DAVINCI_LPSC_TIMER2, 1);
}
