arch/arm/mach-davinci/pm.h

   1 /* SPDX-License-Identifier: GPL-2.0-only */
   2 /*
   3  * TI DaVinci platform support for power management.
   4  *
   5  * Copyright (C) 2009 Texas Instruments, Inc. https://www.ti.com/
   6  */
   7 #ifndef _MACH_DAVINCI_PM_H
   8 #define _MACH_DAVINCI_PM_H
   9
  10 /*
  11  * Caution: Assembly code in sleep.S makes assumtion on the order
  12  * of the members of this structure.
  13  */
  14 struct davinci_pm_config {
  15         void __iomem *ddr2_ctlr_base;
  16         void __iomem *ddrpsc_reg_base;
  17         int ddrpsc_num;
  18         void __iomem *ddrpll_reg_base;
  19         void __iomem *deepsleep_reg;
  20         void __iomem *cpupll_reg_base;
  21         /*
  22          * Note on SLEEPCOUNT:
  23          * The SLEEPCOUNT feature is mainly intended for cases in which
  24          * the internal oscillator is used. The internal oscillator is
  25          * fully disabled in deep sleep mode.  When you exist deep sleep
  26          * mode, the oscillator will be turned on and will generate very
  27          * small oscillations which will not be detected by the deep sleep
  28          * counter.  Eventually those oscillations will grow to an amplitude
  29          * large enough to start incrementing the deep sleep counter.
  30          * In this case recommendation from hardware engineers is that the
  31          * SLEEPCOUNT be set to 4096.  This means that 4096 valid clock cycles
  32          * must be detected before the clock is passed to the rest of the
  33          * system.
  34          * In the case that the internal oscillator is not used and the
  35          * clock is generated externally, the SLEEPCOUNT value can be very
  36          * small since the clock input is assumed to be stable before SoC
  37          * is taken out of deepsleep mode.  A value of 128 would be more than
  38          * adequate.
  39          */
  40         int sleepcount;
  41 };
  42
  43 extern unsigned int davinci_cpu_suspend_sz;
  44 extern void davinci_cpu_suspend(struct davinci_pm_config *);
  45
  46 #endif