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ARM: at91/pm_suspend: add the WFI instruction support for ARMv7 

Add the WFI instruction to make the cpu to the idle state.
In the meanwhile, disable the processor's clock.

Signed-off-by: Wenyou Yang <wenyou.yang@atmel.com>
Acked-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>
Tested-by: Sylvain Rochet <sylvain.rochet@finsecur.com>
Signed-off-by: Nicolas Ferre <nicolas.ferre@atmel.com>
This commit is contained in:
Wenyou Yang 2015-03-09 11:53:46 +08:00 committed by Nicolas Ferre
parent e32d995cf9
commit 20567658b8
1 changed files with 19 additions and 1 deletions
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20
arch/arm/mach-at91/pm_suspend.S
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@ -51,6 +51,24 @@ tmp2 .req r5
beq 1b
.endm
/*
* Put the processor to enter the idle state
*/
.macro at91_cpu_idle
#if defined(CONFIG_CPU_V7)
mov tmp1, #AT91_PMC_PCK
str tmp1, [pmc, #AT91_PMC_SCDR]
dsb
wfi @ Wait For Interrupt
#else
mcr p15, 0, tmp1, c7, c0, 4
#endif
.endm
.text
.arm
@ -123,7 +141,7 @@ skip_disable_main_clock:
ldr pmc, .pmc_base
/* Wait for interrupt */
mcr p15, 0, tmp1, c7, c0, 4
at91_cpu_idle
ldr r0, .pm_mode
tst r0, #AT91_PM_SLOW_CLOCK