forked from Minki/linux
02a00cf672
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>
52 lines
1.1 KiB
C
52 lines
1.1 KiB
C
/*
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* AVR32 AP Power Management.
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*
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* Copyright (C) 2008 Atmel Corporation
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#ifndef __ASM_AVR32_ARCH_PM_H
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#define __ASM_AVR32_ARCH_PM_H
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/* Possible arguments to the "sleep" instruction */
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#define CPU_SLEEP_IDLE 0
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#define CPU_SLEEP_FROZEN 1
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#define CPU_SLEEP_STANDBY 2
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#define CPU_SLEEP_STOP 3
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#define CPU_SLEEP_STATIC 5
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#ifndef __ASSEMBLY__
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extern void cpu_enter_idle(void);
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extern void cpu_enter_standby(unsigned long sdramc_base);
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extern bool disable_idle_sleep;
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static inline void cpu_disable_idle_sleep(void)
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{
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disable_idle_sleep = true;
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}
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static inline void cpu_enable_idle_sleep(void)
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{
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disable_idle_sleep = false;
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}
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static inline void cpu_idle_sleep(void)
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{
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/*
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* If we're using the COUNT and COMPARE registers for
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* timekeeping, we can't use the IDLE state.
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*/
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if (disable_idle_sleep)
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cpu_relax();
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else
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cpu_enter_idle();
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}
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void intc_set_suspend_handler(unsigned long offset);
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#endif
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#endif /* __ASM_AVR32_ARCH_PM_H */
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