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
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