You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
66 lines
1.8 KiB
66 lines
1.8 KiB
/*
|
|
* Low-level Power Management code.
|
|
*
|
|
* 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.
|
|
*/
|
|
#include <asm/asm.h>
|
|
#include <asm/asm-offsets.h>
|
|
#include <asm/thread_info.h>
|
|
#include <asm/arch/pm.h>
|
|
|
|
.section .bss, "wa", @nobits
|
|
.global disable_idle_sleep
|
|
.type disable_idle_sleep, @object
|
|
disable_idle_sleep:
|
|
.int 4
|
|
.size disable_idle_sleep, . - disable_idle_sleep
|
|
|
|
/* Keep this close to the irq handlers */
|
|
.section .irq.text, "ax", @progbits
|
|
|
|
/*
|
|
* void cpu_enter_idle(void)
|
|
*
|
|
* Put the CPU into "idle" mode, in which it will consume
|
|
* significantly less power.
|
|
*
|
|
* If an interrupt comes along in the window between
|
|
* unmask_interrupts and the sleep instruction below, the
|
|
* interrupt code will adjust the return address so that we
|
|
* never execute the sleep instruction. This is required
|
|
* because the AP7000 doesn't unmask interrupts when entering
|
|
* sleep modes; later CPUs may not need this workaround.
|
|
*/
|
|
.global cpu_enter_idle
|
|
.type cpu_enter_idle, @function
|
|
cpu_enter_idle:
|
|
mask_interrupts
|
|
get_thread_info r8
|
|
ld.w r9, r8[TI_flags]
|
|
bld r9, TIF_NEED_RESCHED
|
|
brcs .Lret_from_sleep
|
|
sbr r9, TIF_CPU_GOING_TO_SLEEP
|
|
st.w r8[TI_flags], r9
|
|
unmask_interrupts
|
|
sleep CPU_SLEEP_IDLE
|
|
.size cpu_idle_sleep, . - cpu_idle_sleep
|
|
|
|
/*
|
|
* Common return path for PM functions that don't run from
|
|
* SRAM.
|
|
*/
|
|
.global cpu_idle_skip_sleep
|
|
.type cpu_idle_skip_sleep, @function
|
|
cpu_idle_skip_sleep:
|
|
mask_interrupts
|
|
ld.w r9, r8[TI_flags]
|
|
cbr r9, TIF_CPU_GOING_TO_SLEEP
|
|
st.w r8[TI_flags], r9
|
|
.Lret_from_sleep:
|
|
unmask_interrupts
|
|
retal r12
|
|
.size cpu_idle_skip_sleep, . - cpu_idle_skip_sleep
|
|
|