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