1 /* 2 * TI DaVinci platform support for power management. 3 * 4 * Copyright (C) 2009 Texas Instruments, Inc. https://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 55