arch/arm/mach-davinci/psc.c

   1 /*
   2  * TI DaVinci Power and Sleep Controller (PSC)
   3  *
   4  * Copyright (C) 2006 Texas Instruments.
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation; either version 2 of the License, or
   9  * (at your option) any later version.
  10  *
  11  * This program is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  * GNU General Public License for more details.
  15  *
  16  *  You should have received a copy of the GNU General Public License
  17  *  along with this program; if not, write to the Free Software
  18  *  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  19  *
  20  */
  21 #include <linux/kernel.h>
  22 #include <linux/module.h>
  23 #include <linux/init.h>
  24
  25 #include <asm/io.h>
  26 #include <asm/hardware.h>
  27 #include <asm/arch/psc.h>
  28
  29 #define PTCMD        __REG(0x01C41120)
  30 #define PDSTAT       __REG(0x01C41200)
  31 #define PDCTL1       __REG(0x01C41304)
  32 #define EPCPR        __REG(0x01C41070)
  33 #define PTSTAT       __REG(0x01C41128)
  34
  35 #define MDSTAT       IO_ADDRESS(0x01C41800)
  36 #define MDCTL        IO_ADDRESS(0x01C41A00)
  37
  38 #define PINMUX0      __REG(0x01c40000)
  39 #define PINMUX1      __REG(0x01c40004)
  40 #define VDD3P3V_PWDN __REG(0x01C40048)
  41
  42 static void davinci_psc_mux(unsigned int id)
  43 {
  44         switch (id) {
  45         case DAVINCI_LPSC_ATA:
  46                 PINMUX0 |= (1 << 17) | (1 << 16);
  47                 break;
  48         case DAVINCI_LPSC_MMC_SD:
  49                 /* VDD power manupulations are done in U-Boot for CPMAC
  50                  * so applies to MMC as well
  51                  */
  52                 /*Set up the pull regiter for MMC */
  53                 VDD3P3V_PWDN = 0x0;
  54                 PINMUX1 &= (~(1 << 9));
  55                 break;
  56         case DAVINCI_LPSC_I2C:
  57                 PINMUX1 |= (1 << 7);
  58                 break;
  59         case DAVINCI_LPSC_McBSP:
  60                 PINMUX1 |= (1 << 10);
  61                 break;
  62         default:
  63                 break;
  64         }
  65 }
  66
  67 /* Enable or disable a PSC domain */
  68 void davinci_psc_config(unsigned int domain, unsigned int id, char enable)
  69 {
  70         volatile unsigned int *mdstat = (unsigned int *)((int)MDSTAT + 4 * id);
  71         volatile unsigned int *mdctl = (unsigned int *)((int)MDCTL + 4 * id);
  72
  73         if (id < 0)
  74                 return;
  75
  76         if (enable)
  77                 *mdctl |= 0x00000003;   /* Enable Module */
  78         else
  79                 *mdctl &= 0xFFFFFFF2;   /* Disable Module */
  80
  81         if ((PDSTAT & 0x00000001) == 0) {
  82                 PDCTL1 |= 0x1;
  83                 PTCMD = (1 << domain);
  84                 while ((((EPCPR >> domain) & 1) == 0));
  85
  86                 PDCTL1 |= 0x100;
  87                 while (!(((PTSTAT >> domain) & 1) == 0));
  88         } else {
  89                 PTCMD = (1 << domain);
  90                 while (!(((PTSTAT >> domain) & 1) == 0));
  91         }
  92
  93         if (enable)
  94                 while (!((*mdstat & 0x0000001F) == 0x3));
  95         else
  96                 while (!((*mdstat & 0x0000001F) == 0x2));
  97
  98         if (enable)
  99                 davinci_psc_mux(id);
 100 }
 101
 102 void __init davinci_psc_init(void)
 103 {
 104         davinci_psc_config(DAVINCI_GPSC_ARMDOMAIN, DAVINCI_LPSC_VPSSMSTR, 1);
 105         davinci_psc_config(DAVINCI_GPSC_ARMDOMAIN, DAVINCI_LPSC_VPSSSLV, 1);
 106         davinci_psc_config(DAVINCI_GPSC_ARMDOMAIN, DAVINCI_LPSC_TPCC, 1);
 107         davinci_psc_config(DAVINCI_GPSC_ARMDOMAIN, DAVINCI_LPSC_TPTC0, 1);
 108         davinci_psc_config(DAVINCI_GPSC_ARMDOMAIN, DAVINCI_LPSC_TPTC1, 1);
 109         davinci_psc_config(DAVINCI_GPSC_ARMDOMAIN, DAVINCI_LPSC_GPIO, 1);
 110
 111         /* Turn on WatchDog timer LPSC.  Needed for RESET to work */
 112         davinci_psc_config(DAVINCI_GPSC_ARMDOMAIN, DAVINCI_LPSC_TIMER2, 1);
 113 }