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 47