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 | |