arch/arm/mach-sa1100/pm.c

Source file repositories/reference/linux-study-clean/arch/arm/mach-sa1100/pm.c

File Facts

System
Linux kernel
Corpus path
arch/arm/mach-sa1100/pm.c
Extension
.c
Size
2668 bytes
Lines
129
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

#include <linux/init.h>
#include <linux/io.h>
#include <linux/suspend.h>
#include <linux/errno.h>
#include <linux/time.h>

#include <mach/hardware.h>
#include <asm/page.h>
#include <asm/suspend.h>
#include <asm/mach/time.h>

#include "generic.h"

extern int sa1100_finish_suspend(unsigned long);

#define SAVE(x)		sleep_save[SLEEP_SAVE_##x] = x
#define RESTORE(x)	x = sleep_save[SLEEP_SAVE_##x]

/*
 * List of global SA11x0 peripheral registers to preserve.
 * More ones like CP and general purpose register values are preserved
 * on the stack and then the stack pointer is stored last in sleep.S.
 */
enum {	SLEEP_SAVE_GPDR, SLEEP_SAVE_GAFR,
	SLEEP_SAVE_PPDR, SLEEP_SAVE_PPSR, SLEEP_SAVE_PPAR, SLEEP_SAVE_PSDR,

	SLEEP_SAVE_Ser1SDCR0,

	SLEEP_SAVE_COUNT
};


static int sa11x0_pm_enter(suspend_state_t state)
{
	unsigned long gpio, sleep_save[SLEEP_SAVE_COUNT];

	gpio = GPLR;

	/* save vital registers */
	SAVE(GPDR);
	SAVE(GAFR);

	SAVE(PPDR);
	SAVE(PPSR);
	SAVE(PPAR);
	SAVE(PSDR);

	SAVE(Ser1SDCR0);

	/* Clear previous reset status */
	RCSR = RCSR_HWR | RCSR_SWR | RCSR_WDR | RCSR_SMR;

	/* set resume return address */
	PSPR = __pa_symbol(cpu_resume);

	/* go zzz */
	cpu_suspend(0, sa1100_finish_suspend);

	/*
	 * Ensure not to come back here if it wasn't intended
	 */
	RCSR = RCSR_SMR;
	PSPR = 0;

	/*
	 * Ensure interrupt sources are disabled; we will re-init
	 * the interrupt subsystem via the device manager.
	 */
	ICLR = 0;
	ICCR = 1;
	ICMR = 0;

	/* restore registers */
	RESTORE(GPDR);
	RESTORE(GAFR);

	RESTORE(PPDR);
	RESTORE(PPSR);
	RESTORE(PPAR);
	RESTORE(PSDR);

	RESTORE(Ser1SDCR0);

	GPSR = gpio;
	GPCR = ~gpio;

	/*
	 * Clear the peripheral sleep-hold bit.
	 */
	PSSR = PSSR_PH;

Annotation

Implementation Notes