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openrisc: Initial support for the idle state

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This patch adds basic support for the idle state of the cpu.
The patch overrides the regular idle function, enables the interupts,
checks for the power management unit and enables the cpu doze mode
if available.

Signed-off-by: Sebastian Macke <sebastian@macke.de>
[shorne@gmail.com: Fixed checkpatch, blankline after declarations]
Signed-off-by: Stafford Horne <shorne@gmail.com>
This commit is contained in:
Sebastian Macke 2014-07-20 15:13:31 +00:00 committed by Stafford Horne
parent 79f8a4d022
commit e29d11c699
1 changed files with 11 additions and 0 deletions
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11
arch/openrisc/kernel/process.c
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@ -75,6 +75,17 @@ void machine_power_off(void)
__asm__("l.nop 1");
}
/*
* Send the doze signal to the cpu if available.
* Make sure, that all interrupts are enabled
*/
void arch_cpu_idle(void)
{
local_irq_enable();
if (mfspr(SPR_UPR) & SPR_UPR_PMP)
mtspr(SPR_PMR, mfspr(SPR_PMR) | SPR_PMR_DME);
}
void (*pm_power_off) (void) = machine_power_off;
/*