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ARM: at91: implement the standby function for pm/cpuidle

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This patch groups the self-refresh on/cpu_do_idle/self-refresh off into
a single 'standby' function.

The standby routine for rm9200 has been turned into an asm routine to have
a better control of the self refresh and to prevent a memory access when
running this code.

Draining the write buffer is done automatically when switching for the self
refresh on sam9, so the instruction is added to the rm9200 only.

Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
Signed-off-by: Nicolas Ferre <nicolas.ferre@atmel.com>
This commit is contained in:
Daniel Lezcano
2012-01-25 00:56:08 +01:00
committed by Nicolas Ferre
parent b59160f6c0
commit 00482a4078
3 changed files with 33 additions and 41 deletions
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11
arch/arm/mach-at91/cpuidle.c
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@@ -39,20 +39,15 @@ static int at91_enter_idle(struct cpuidle_device *dev,
{
struct timeval before, after;
int idle_time;
u32 saved_lpr;
local_irq_disable();
do_gettimeofday(&before);
if (index == 0)
/* Wait for interrupt state */
cpu_do_idle();
else if (index == 1) {
asm("b 1f; .align 5; 1:");
asm("mcr p15, 0, r0, c7, c10, 4"); /* drain write buffer */
saved_lpr = sdram_selfrefresh_enable();
cpu_do_idle();
sdram_selfrefresh_disable(saved_lpr);
}
else if (index == 1)
at91_standby();
do_gettimeofday(&after);
local_irq_enable();
idle_time = (after.tv_sec - before.tv_sec) * USEC_PER_SEC +