arch/arm/mach-davinci/include/mach/pm.h

   1 /*
   2  * TI DaVinci platform support for power management.
   3  *
   4  * Copyright (C) 2009 Texas Instruments, Inc. http://www.ti.com/
   5  *
   6  * This program is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU General Public License as
   8  * published by the Free Software Foundation version 2.
   9  *
  10  * This program is distributed "as is" WITHOUT ANY WARRANTY of any
  11  * kind, whether express or implied; without even the implied warranty
  12  * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  * GNU General Public License for more details.
  14  */
  15 #ifndef _MACH_DAVINCI_PM_H
  16 #define _MACH_DAVINCI_PM_H
  17
  18 /*
  19  * Caution: Assembly code in sleep.S makes assumtion on the order
  20  * of the members of this structure.
  21  */
  22 struct davinci_pm_config {
  23         void __iomem *ddr2_ctlr_base;
  24         void __iomem *ddrpsc_reg_base;
  25         int ddrpsc_num;
  26         void __iomem *ddrpll_reg_base;
  27         void __iomem *deepsleep_reg;
  28         void __iomem *cpupll_reg_base;
  29         /*
  30          * Note on SLEEPCOUNT:
  31          * The SLEEPCOUNT feature is mainly intended for cases in which
  32          * the internal oscillator is used. The internal oscillator is
  33          * fully disabled in deep sleep mode.  When you exist deep sleep
  34          * mode, the oscillator will be turned on and will generate very
  35          * small oscillations which will not be detected by the deep sleep
  36          * counter.  Eventually those oscillations will grow to an amplitude
  37          * large enough to start incrementing the deep sleep counter.
  38          * In this case recommendation from hardware engineers is that the
  39          * SLEEPCOUNT be set to 4096.  This means that 4096 valid clock cycles
  40          * must be detected before the clock is passed to the rest of the
  41          * system.
  42          * In the case that the internal oscillator is not used and the
  43          * clock is generated externally, the SLEEPCOUNT value can be very
  44          * small since the clock input is assumed to be stable before SoC
  45          * is taken out of deepsleep mode.  A value of 128 would be more than
  46          * adequate.
  47          */
  48         int sleepcount;
  49 };
  50
  51 extern unsigned int davinci_cpu_suspend_sz;
  52 extern void davinci_cpu_suspend(struct davinci_pm_config *);
  53
  54 #endif