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soc: atmel_sam0: Add GCLK Reset

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Fixes an issue with mcuboot where the SoC will freeze when the dpll is
disabled since `atmel_samd_init` was already run in the bootloader.

Signed-off-by: Abram Early <abram.early@gmail.com>
This commit is contained in:
Abram Early 2021-03-29 17:07:44 -06:00 • committed by Ioannis Glaropoulos
commit f791211871
1 changed files with 8 additions and 0 deletions
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8
soc/arm/atmel_sam0/common/soc_samd5x.c
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@ -91,6 +91,13 @@ static void dfll_init(void)
}
}
static void gclk_reset(void)
{
GCLK->CTRLA.bit.SWRST = 1;
while (GCLK->SYNCBUSY.bit.SWRST) {
}
}
static void gclk_connect(uint8_t gclk, uint8_t src, uint8_t div)
{
GCLK->GENCTRL[gclk].reg = GCLK_GENCTRL_SRC(src)
@ -118,6 +125,7 @@ static int atmel_samd_init(const struct device *arg)
/* enable the Cortex M Cache Controller */
CMCC->CTRL.bit.CEN = 1;
gclk_reset();
osc32k_init();
dfll_init();
dpll_init(0, dfll_div * CONFIG_SYS_CLOCK_HW_CYCLES_PER_SEC);