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ARM: atmel: spl: make initialization more stable

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We need to make sure the main clock ready field in MCFR is set
after switch to main crystal oscillator.

Signed-off-by: Bo Shen <voice.shen@atmel.com>
Signed-off-by: Andreas Bießmann <andreas.devel@googlemail.com>
This commit is contained in:
Bo Shen 2014-10-24 16:13:25 +08:00 • committed by Tom Rini
parent 59158ba39d
commit a5f35d63f2
1 changed files with 4 additions and 0 deletions
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4
arch/arm/cpu/at91-common/spl.c
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@ -50,6 +50,10 @@ static void switch_to_main_crystal_osc(void)
while (!(readl(&pmc->sr) & AT91_PMC_IXR_MOSCSELS)) while (!(readl(&pmc->sr) & AT91_PMC_IXR_MOSCSELS))
; ;
/* Wait until MAINRDY field is set to make sure main clock is stable */
while (!(readl(&pmc->mcfr) & AT91_PMC_MAINRDY))
;
tmp = readl(&pmc->mor); tmp = readl(&pmc->mor);
tmp &= ~AT91_PMC_MOR_MOSCRCEN; tmp &= ~AT91_PMC_MOR_MOSCRCEN;
tmp &= ~AT91_PMC_MOR_KEY(0xff); tmp &= ~AT91_PMC_MOR_KEY(0xff);