arm/mach-davinci/pm.h

0001 /* SPDX-License-Identifier: GPL-2.0-only */
0002 /*
0003  * TI DaVinci platform support for power management.
0004  *
0005  * Copyright (C) 2009 Texas Instruments, Inc. https://www.ti.com/
0006  */
0007 #ifndef _MACH_DAVINCI_PM_H
0008 #define _MACH_DAVINCI_PM_H
0009
0010 /*
0011  * Caution: Assembly code in sleep.S makes assumtion on the order
0012  * of the members of this structure.
0013  */
0014 struct davinci_pm_config {
0015     void __iomem *ddr2_ctlr_base;
0016     void __iomem *ddrpsc_reg_base;
0017     int ddrpsc_num;
0018     void __iomem *ddrpll_reg_base;
0019     void __iomem *deepsleep_reg;
0020     void __iomem *cpupll_reg_base;
0021     /*
0022      * Note on SLEEPCOUNT:
0023      * The SLEEPCOUNT feature is mainly intended for cases in which
0024      * the internal oscillator is used. The internal oscillator is
0025      * fully disabled in deep sleep mode.  When you exist deep sleep
0026      * mode, the oscillator will be turned on and will generate very
0027      * small oscillations which will not be detected by the deep sleep
0028      * counter.  Eventually those oscillations will grow to an amplitude
0029      * large enough to start incrementing the deep sleep counter.
0030      * In this case recommendation from hardware engineers is that the
0031      * SLEEPCOUNT be set to 4096.  This means that 4096 valid clock cycles
0032      * must be detected before the clock is passed to the rest of the
0033      * system.
0034      * In the case that the internal oscillator is not used and the
0035      * clock is generated externally, the SLEEPCOUNT value can be very
0036      * small since the clock input is assumed to be stable before SoC
0037      * is taken out of deepsleep mode.  A value of 128 would be more than
0038      * adequate.
0039      */
0040     int sleepcount;
0041 };
0042
0043 extern unsigned int davinci_cpu_suspend_sz;
0044 extern void davinci_cpu_suspend(struct davinci_pm_config *);
0045
0046 #endif