arch/arm/mach-davinci/pm.h

Source file repositories/reference/linux-study-clean/arch/arm/mach-davinci/pm.h

File Facts

System
Linux kernel
Corpus path
arch/arm/mach-davinci/pm.h
Extension
.h
Size
1672 bytes
Lines
47
Domain
Architecture Layer
Bucket
arch/arm
Inferred role
Architecture Layer: implementation source
Status
source implementation candidate

Why This File Exists

CPU and platform-specific kernel glue: boot entry, traps, syscall entry, interrupts, page tables, context switch, and low-level barriers.

Dependency Surface

Detected Declarations

Annotated Snippet

struct davinci_pm_config {
	void __iomem *ddr2_ctlr_base;
	void __iomem *ddrpsc_reg_base;
	int ddrpsc_num;
	void __iomem *ddrpll_reg_base;
	void __iomem *deepsleep_reg;
	void __iomem *cpupll_reg_base;
	/*
	 * Note on SLEEPCOUNT:
	 * The SLEEPCOUNT feature is mainly intended for cases in which
	 * the internal oscillator is used. The internal oscillator is
	 * fully disabled in deep sleep mode.  When you exist deep sleep
	 * mode, the oscillator will be turned on and will generate very
	 * small oscillations which will not be detected by the deep sleep
	 * counter.  Eventually those oscillations will grow to an amplitude
	 * large enough to start incrementing the deep sleep counter.
	 * In this case recommendation from hardware engineers is that the
	 * SLEEPCOUNT be set to 4096.  This means that 4096 valid clock cycles
	 * must be detected before the clock is passed to the rest of the
	 * system.
	 * In the case that the internal oscillator is not used and the
	 * clock is generated externally, the SLEEPCOUNT value can be very
	 * small since the clock input is assumed to be stable before SoC
	 * is taken out of deepsleep mode.  A value of 128 would be more than
	 * adequate.
	 */
	int sleepcount;
};

extern unsigned int davinci_cpu_suspend_sz;
extern void davinci_cpu_suspend(struct davinci_pm_config *);

#endif

Annotation

Implementation Notes