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psc.c

/*
 * 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 <asm/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);
}

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