• Haavard Skinnemoen's avatar
    avr32: Power Management support ("standby" and "mem" modes) · 02a00cf6
    Haavard Skinnemoen authored
    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: default avatarHaavard Skinnemoen <hskinnemoen@atmel.com>
    02a00cf6
pm.h 1.12 KB