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arm: atmel: soc: Soc init can be executed twice

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Signed-off-by: Jonas Pfaff <jonas.pfaff@gmail.com>
This commit is contained in:
Jonas Pfaff 2017-11-20 08:37:38 +01:00 • committed by Anas Nashif
commit 1d8e7a58c0
1 changed files with 37 additions and 33 deletions
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70
arch/arm/soc/atmel_sam/same70/soc.c
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@ -67,46 +67,50 @@ static ALWAYS_INLINE void clock_init(void)
#ifdef CONFIG_SOC_ATMEL_SAME70_EXT_MAINCK
/*
* Setup main external crystal oscillator
* Setup main external crystal oscillator if not already done
* by a previous program i.e. bootloader
*/
/* Start the external crystal oscillator */
PMC->CKGR_MOR = CKGR_MOR_KEY_PASSWD
/* We select maximum setup time. While start up time
* could be shortened this optimization is not deemed
* critical now.
*/
| CKGR_MOR_MOSCXTST(0xFFu)
/* RC OSC must stay on */
| CKGR_MOR_MOSCRCEN
| CKGR_MOR_MOSCXTEN;
if (PMC->PMC_SR & PMC_SR_MOSCRCS) {
/* Start the external crystal oscillator */
PMC->CKGR_MOR = CKGR_MOR_KEY_PASSWD
/* We select maximum setup time.
* While start up time could be shortened
* this optimization is not deemed
* critical now.
*/
| CKGR_MOR_MOSCXTST(0xFFu)
/* RC OSC must stay on */
| CKGR_MOR_MOSCRCEN
| CKGR_MOR_MOSCXTEN;
/* Wait for oscillator to be stabilized */
while (!(PMC->PMC_SR & PMC_SR_MOSCXTS)) {
;
}
/* Wait for oscillator to be stabilized */
while (!(PMC->PMC_SR & PMC_SR_MOSCXTS)) {
;
}
/* Select the external crystal oscillator as main clock source */
PMC->CKGR_MOR = CKGR_MOR_KEY_PASSWD
| CKGR_MOR_MOSCSEL
| CKGR_MOR_MOSCXTST(0xFFu)
| CKGR_MOR_MOSCRCEN
| CKGR_MOR_MOSCXTEN;
/* Select the external crystal oscillator as main clock */
PMC->CKGR_MOR = CKGR_MOR_KEY_PASSWD
| CKGR_MOR_MOSCSEL
| CKGR_MOR_MOSCXTST(0xFFu)
| CKGR_MOR_MOSCRCEN
| CKGR_MOR_MOSCXTEN;
/* Wait for external oscillator to be selected */
while (!(PMC->PMC_SR & PMC_SR_MOSCSELS)) {
;
}
/* Wait for external oscillator to be selected */
while (!(PMC->PMC_SR & PMC_SR_MOSCSELS)) {
;
}
/* Turn off RC OSC, not used any longer, to save power */
PMC->CKGR_MOR = CKGR_MOR_KEY_PASSWD
| CKGR_MOR_MOSCSEL
| CKGR_MOR_MOSCXTST(0xFFu)
| CKGR_MOR_MOSCXTEN;
/* Turn off RC OSC, not used any longer, to save power */
PMC->CKGR_MOR = CKGR_MOR_KEY_PASSWD
| CKGR_MOR_MOSCSEL
| CKGR_MOR_MOSCXTST(0xFFu)
| CKGR_MOR_MOSCXTEN;
/* Wait for RC OSC to be turned off */
while (PMC->PMC_SR & PMC_SR_MOSCRCS) {
;
/* Wait for RC OSC to be turned off */
while (PMC->PMC_SR & PMC_SR_MOSCRCS) {
;
}
}
#ifdef CONFIG_SOC_ATMEL_SAME70_WAIT_MODE