linux/include/asm-avr32/arch-at32ap/pm.h
Haavard Skinnemoen 02a00cf672 avr32: Power Management support ("standby" and "mem" modes)
Implement Standby support. In this mode, we'll suspend all drivers,
put the SDRAM in self-refresh mode and switch off the HSB bus
("frozen" mode.)

Implement Suspend-to-mem support. In this mode, we suspend all
drivers, put the SDRAM into self-refresh mode and switch off all
internal clocks except the 32 kHz oscillator ("stop" mode.)

The lowest-level suspend code runs from a small portion of SRAM
allocated at startup time. This gets rid of a small potential race
with the SDRAM where we might try to enter self-refresh mode in the
middle of an icache burst. We also relocate all interrupt and
exception handlers to SRAM during the small window when we enter and
exit the low-power modes.

We don't need to do any special tricks to start and stop the PLL. The
main clock is automatically gated by hardware until the PLL is stable.

Signed-off-by: Haavard Skinnemoen <hskinnemoen@atmel.com>
2008-07-02 11:05:01 +02:00

52 lines
1.1 KiB
C

/*
* AVR32 AP Power Management.
*
* Copyright (C) 2008 Atmel Corporation
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
#ifndef __ASM_AVR32_ARCH_PM_H
#define __ASM_AVR32_ARCH_PM_H
/* Possible arguments to the "sleep" instruction */
#define CPU_SLEEP_IDLE 0
#define CPU_SLEEP_FROZEN 1
#define CPU_SLEEP_STANDBY 2
#define CPU_SLEEP_STOP 3
#define CPU_SLEEP_STATIC 5
#ifndef __ASSEMBLY__
extern void cpu_enter_idle(void);
extern void cpu_enter_standby(unsigned long sdramc_base);
extern bool disable_idle_sleep;
static inline void cpu_disable_idle_sleep(void)
{
disable_idle_sleep = true;
}
static inline void cpu_enable_idle_sleep(void)
{
disable_idle_sleep = false;
}
static inline void cpu_idle_sleep(void)
{
/*
* If we're using the COUNT and COMPARE registers for
* timekeeping, we can't use the IDLE state.
*/
if (disable_idle_sleep)
cpu_relax();
else
cpu_enter_idle();
}
void intc_set_suspend_handler(unsigned long offset);
#endif
#endif /* __ASM_AVR32_ARCH_PM_H */