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drivers: entropy: gecko_trng: Fully initialize on read #100209

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drivers: entropy: gecko_trng: Fully initialize on read #100209

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40 changes: 20 additions & 20 deletions drivers/entropy/entropy_gecko_trng.c
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Original file line number Diff line number Diff line change
Expand Up @@ -44,6 +44,25 @@
#endif /* _SILICON_LABS_32B_SERIES_2_CONFIG_* */
#endif /* CONFIG_CRYPTO_ACC_GECKO_TRNG */

static int entropy_gecko_trng_init(const struct device *dev)
{
/* Enable the TRNG0 clock. */
#ifndef CONFIG_CRYPTO_ACC_GECKO_TRNG
CMU_ClockEnable(cmuClock_TRNG0, true);

/* Enable TRNG0. */
TRNG0->CONTROL = TRNG_CONTROL_ENABLE;
#else
/* Enable the CRYPTO ACC clock. */
CMU_ClockEnable(cmuClock_CRYPTOACC, true);

/* Enable TRNG */
S2_CTRL |= S2_CTRL_ENABLE;
#endif

return 0;
}

static void entropy_gecko_trng_read(uint8_t *output, size_t len)
{
#ifndef CONFIG_CRYPTO_ACC_GECKO_TRNG
Expand Down Expand Up @@ -77,7 +96,7 @@ static int entropy_gecko_trng_get_entropy(const struct device *dev,
ARG_UNUSED(dev);

#ifdef CONFIG_CRYPTO_ACC_GECKO_TRNG
CMU_ClockEnable(cmuClock_CRYPTOACC, true);
entropy_gecko_trng_init(dev);
#endif

while (length) {
Expand Down Expand Up @@ -130,25 +149,6 @@ static int entropy_gecko_trng_get_entropy_isr(const struct device *dev,
}
}

static int entropy_gecko_trng_init(const struct device *dev)
{
/* Enable the TRNG0 clock. */
#ifndef CONFIG_CRYPTO_ACC_GECKO_TRNG
CMU_ClockEnable(cmuClock_TRNG0, true);

/* Enable TRNG0. */
TRNG0->CONTROL = TRNG_CONTROL_ENABLE;
#else
/* Enable the CRYPTO ACC clock. */
CMU_ClockEnable(cmuClock_CRYPTOACC, true);

/* Enable TRNG */
S2_CTRL |= S2_CTRL_ENABLE;
#endif

return 0;
}

static DEVICE_API(entropy, entropy_gecko_trng_api_funcs) = {
.get_entropy = entropy_gecko_trng_get_entropy,
.get_entropy_isr = entropy_gecko_trng_get_entropy_isr
Expand Down