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ARM: at91: pm: disable RC oscillator in ULP0 

Disable RC oscillator in ULP0 as datasheet specifies.

Signed-off-by: Claudiu Beznea <claudiu.beznea@microchip.com>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Signed-off-by: Ludovic Desroches <ludovic.desroches@microchip.com>
This commit is contained in:
Claudiu Beznea 2019-02-14 15:55:01 +00:00 committed by Ludovic Desroches
parent eaedc0d379
commit bc0779bd8f
1 changed files with 37 additions and 2 deletions
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39
arch/arm/mach-at91/pm_suspend.S
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@ -178,11 +178,46 @@ ENDPROC(at91_backup_mode)
orr tmp1, tmp1, #AT91_PMC_KEY
str tmp1, [pmc, #AT91_CKGR_MOR]
/* Save RC oscillator state */
ldr tmp1, [pmc, #AT91_PMC_SR]
str tmp1, .saved_osc_status
tst tmp1, #AT91_PMC_MOSCRCS
bne 1f
/* Turn off RC oscillator */
ldr tmp1, [pmc, #AT91_CKGR_MOR]
bic tmp1, tmp1, #AT91_PMC_MOSCRCEN
bic tmp1, tmp1, #AT91_PMC_KEY_MASK
orr tmp1, tmp1, #AT91_PMC_KEY
str tmp1, [pmc, #AT91_CKGR_MOR]
/* Wait main RC disabled done */
2: ldr tmp1, [pmc, #AT91_PMC_SR]
tst tmp1, #AT91_PMC_MOSCRCS
bne 2b
/* Wait for interrupt */
at91_cpu_idle
1: at91_cpu_idle
/* Restore RC oscillator state */
ldr tmp1, .saved_osc_status
tst tmp1, #AT91_PMC_MOSCRCS
beq 4f
/* Turn on RC oscillator */
ldr tmp1, [pmc, #AT91_CKGR_MOR]
orr tmp1, tmp1, #AT91_PMC_MOSCRCEN
bic tmp1, tmp1, #AT91_PMC_KEY_MASK
orr tmp1, tmp1, #AT91_PMC_KEY
str tmp1, [pmc, #AT91_CKGR_MOR]
/* Wait main RC stabilization */
3: ldr tmp1, [pmc, #AT91_PMC_SR]
tst tmp1, #AT91_PMC_MOSCRCS
beq 3b
/* Turn on the crystal oscillator */
ldr tmp1, [pmc, #AT91_CKGR_MOR]
4: ldr tmp1, [pmc, #AT91_CKGR_MOR]
orr tmp1, tmp1, #AT91_PMC_MOSCEN
orr tmp1, tmp1, #AT91_PMC_KEY
str tmp1, [pmc, #AT91_CKGR_MOR]