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 <mach/hardware.h>
  27 #include <mach/psc.h>
  28 #include <mach/mux.h>
  29
  30 /* PSC register offsets */
  31 #define EPCPR           0x070
  32 #define PTCMD           0x120
  33 #define PTSTAT          0x128
  34 #define PDSTAT          0x200
  35 #define PDCTL1          0x304
  36 #define MDSTAT          0x800
  37 #define MDCTL           0xA00
  38
  39 /* System control register offsets */
  40 #define VDD3P3V_PWDN    0x48
  41
  42 static void davinci_psc_mux(unsigned int id)
  43 {
  44         switch (id) {
  45         case DAVINCI_LPSC_ATA:
  46                 davinci_mux_peripheral(DAVINCI_MUX_HDIREN, 1);
  47                 davinci_mux_peripheral(DAVINCI_MUX_ATAEN, 1);
  48                 break;
  49         case DAVINCI_LPSC_MMC_SD:
  50                 /* VDD power manupulations are done in U-Boot for CPMAC
  51                  * so applies to MMC as well
  52                  */
  53                 /*Set up the pull regiter for MMC */
  54                 davinci_writel(0, DAVINCI_SYSTEM_MODULE_BASE + VDD3P3V_PWDN);
  55                 davinci_mux_peripheral(DAVINCI_MUX_MSTK, 0);
  56                 break;
  57         case DAVINCI_LPSC_I2C:
  58                 davinci_mux_peripheral(DAVINCI_MUX_I2C, 1);
  59                 break;
  60         case DAVINCI_LPSC_McBSP:
  61                 davinci_mux_peripheral(DAVINCI_MUX_ASP, 1);
  62                 break;
  63         default:
  64                 break;
  65         }
  66 }
  67
  68 /* Enable or disable a PSC domain */
  69 void davinci_psc_config(unsigned int domain, unsigned int id, char enable)
  70 {
  71         u32 epcpr, ptcmd, ptstat, pdstat, pdctl1, mdstat, mdctl, mdstat_mask;
  72
  73         if (id < 0)
  74                 return;
  75
  76         mdctl = davinci_readl(DAVINCI_PWR_SLEEP_CNTRL_BASE + MDCTL + 4 * id);
  77         if (enable)
  78                 mdctl |= 0x00000003;    /* Enable Module */
  79         else
  80                 mdctl &= 0xFFFFFFF2;    /* Disable Module */
  81         davinci_writel(mdctl, DAVINCI_PWR_SLEEP_CNTRL_BASE + MDCTL + 4 * id);
  82
  83         pdstat = davinci_readl(DAVINCI_PWR_SLEEP_CNTRL_BASE + PDSTAT);
  84         if ((pdstat & 0x00000001) == 0) {
  85                 pdctl1 = davinci_readl(DAVINCI_PWR_SLEEP_CNTRL_BASE + PDCTL1);
  86                 pdctl1 |= 0x1;
  87                 davinci_writel(pdctl1, DAVINCI_PWR_SLEEP_CNTRL_BASE + PDCTL1);
  88
  89                 ptcmd = 1 << domain;
  90                 davinci_writel(ptcmd, DAVINCI_PWR_SLEEP_CNTRL_BASE + PTCMD);
  91
  92                 do {
  93                         epcpr = davinci_readl(DAVINCI_PWR_SLEEP_CNTRL_BASE +
  94                                               EPCPR);
  95                 } while ((((epcpr >> domain) & 1) == 0));
  96
  97                 pdctl1 = davinci_readl(DAVINCI_PWR_SLEEP_CNTRL_BASE + PDCTL1);
  98                 pdctl1 |= 0x100;
  99                 davinci_writel(pdctl1, DAVINCI_PWR_SLEEP_CNTRL_BASE + PDCTL1);
 100
 101                 do {
 102                         ptstat = davinci_readl(DAVINCI_PWR_SLEEP_CNTRL_BASE +
 103                                                PTSTAT);
 104                 } while (!(((ptstat >> domain) & 1) == 0));
 105         } else {
 106                 ptcmd = 1 << domain;
 107                 davinci_writel(ptcmd, DAVINCI_PWR_SLEEP_CNTRL_BASE + PTCMD);
 108
 109                 do {
 110                         ptstat = davinci_readl(DAVINCI_PWR_SLEEP_CNTRL_BASE +
 111                                                PTSTAT);
 112                 } while (!(((ptstat >> domain) & 1) == 0));
 113         }
 114
 115         if (enable)
 116                 mdstat_mask = 0x3;
 117         else
 118                 mdstat_mask = 0x2;
 119
 120         do {
 121                 mdstat = davinci_readl(DAVINCI_PWR_SLEEP_CNTRL_BASE +
 122                                        MDSTAT + 4 * id);
 123         } while (!((mdstat & 0x0000001F) == mdstat_mask));
 124
 125         if (enable)
 126                 davinci_psc_mux(id);
 127 }
 128
 129 void __init davinci_psc_init(void)
 130 {
 131         davinci_psc_config(DAVINCI_GPSC_ARMDOMAIN, DAVINCI_LPSC_VPSSMSTR, 1);
 132         davinci_psc_config(DAVINCI_GPSC_ARMDOMAIN, DAVINCI_LPSC_VPSSSLV, 1);
 133         davinci_psc_config(DAVINCI_GPSC_ARMDOMAIN, DAVINCI_LPSC_TPCC, 1);
 134         davinci_psc_config(DAVINCI_GPSC_ARMDOMAIN, DAVINCI_LPSC_TPTC0, 1);
 135         davinci_psc_config(DAVINCI_GPSC_ARMDOMAIN, DAVINCI_LPSC_TPTC1, 1);
 136         davinci_psc_config(DAVINCI_GPSC_ARMDOMAIN, DAVINCI_LPSC_GPIO, 1);
 137
 138         /* Turn on WatchDog timer LPSC.  Needed for RESET to work */
 139         davinci_psc_config(DAVINCI_GPSC_ARMDOMAIN, DAVINCI_LPSC_TIMER2, 1);
 140 }