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drivers/entropy/entropy_gecko_trng: support BG27

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Add TRNG support for BG27, which has slightly different register
definitions in HAL, compared to BG22.

Signed-off-by: Roman Dobrodii <rdobrodii@antmicro.com>
This commit is contained in:
Roman Dobrodii 2023-04-14 16:57:10 +02:00 • committed by Carles Cufí
commit f9e2d064c4
2 changed files with 24 additions and 4 deletions
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1
drivers/entropy/Kconfig.gecko
View file

@ -10,6 +10,7 @@ config ENTROPY_GECKO_TRNG
depends on DT_HAS_SILABS_GECKO_TRNG_ENABLED depends on DT_HAS_SILABS_GECKO_TRNG_ENABLED
select ENTROPY_HAS_DRIVER select ENTROPY_HAS_DRIVER
select CRYPTO_ACC_GECKO_TRNG if SOC_SERIES_EFR32BG22 select CRYPTO_ACC_GECKO_TRNG if SOC_SERIES_EFR32BG22
select CRYPTO_ACC_GECKO_TRNG if SOC_SERIES_EFR32BG27
help help
This option enables the true random number generator This option enables the true random number generator
driver based on the TRNG. driver based on the TRNG.

27
drivers/entropy/entropy_gecko_trng.c
View file

@ -11,6 +11,25 @@
#include "soc.h" #include "soc.h"
#include "em_cmu.h" #include "em_cmu.h"
#if defined(CONFIG_CRYPTO_ACC_GECKO_TRNG)
/**
* Series 2 SoCs have different TRNG register definitions
*/
#if defined(_SILICON_LABS_32B_SERIES_2_CONFIG_2) /* xG22 */
#define S2_FIFO_BASE (CRYPTOACC_RNGOUT_FIFO_S_MEM_BASE)
#define S2_FIFO_LEVEL (CRYPTOACC_RNGCTRL->FIFOLEVEL)
#define S2_CTRL (CRYPTOACC_RNGCTRL->RNGCTRL)
#define S2_CTRL_ENABLE (CRYPTOACC_RNGCTRL_ENABLE)
#elif defined(_SILICON_LABS_32B_SERIES_2_CONFIG_7) /* xG27 */
#define S2_FIFO_BASE (CRYPTOACC_RNGOUT_FIFO_S_MEM_BASE)
#define S2_FIFO_LEVEL (CRYPTOACC->NDRNG_FIFOLEVEL)
#define S2_CTRL (CRYPTOACC->NDRNG_CONTROL)
#define S2_CTRL_ENABLE (CRYPTOACC_NDRNG_CONTROL_ENABLE)
#else /* _SILICON_LABS_32B_SERIES_2_CONFIG_* */
#error "Building for unsupported Series 2 SoC"
#endif /* _SILICON_LABS_32B_SERIES_2_CONFIG_* */
#endif /* CONFIG_CRYPTO_ACC_GECKO_TRNG */
static void entropy_gecko_trng_read(uint8_t *output, size_t len) static void entropy_gecko_trng_read(uint8_t *output, size_t len)
{ {
#ifndef CONFIG_CRYPTO_ACC_GECKO_TRNG #ifndef CONFIG_CRYPTO_ACC_GECKO_TRNG
@ -30,7 +49,7 @@ static void entropy_gecko_trng_read(uint8_t *output, size_t len)
memcpy(data, (const uint8_t *) &tmp, len); memcpy(data, (const uint8_t *) &tmp, len);
} }
#else #else
memcpy(output, ((const uint8_t *) CRYPTOACC_RNGOUT_FIFO_S_MEM_BASE), len); memcpy(output, ((const uint8_t *) S2_FIFO_BASE), len);
#endif #endif
} }
@ -47,7 +66,7 @@ static int entropy_gecko_trng_get_entropy(const struct device *dev,
#ifndef CONFIG_CRYPTO_ACC_GECKO_TRNG #ifndef CONFIG_CRYPTO_ACC_GECKO_TRNG
available = TRNG0->FIFOLEVEL * 4; available = TRNG0->FIFOLEVEL * 4;
#else #else
available = CRYPTOACC_RNGCTRL->FIFOLEVEL * 4; available = S2_FIFO_LEVEL * 4;
#endif #endif
if (available == 0) { if (available == 0) {
return -EINVAL; return -EINVAL;
@ -74,7 +93,7 @@ static int entropy_gecko_trng_get_entropy_isr(const struct device *dev,
#ifndef CONFIG_CRYPTO_ACC_GECKO_TRNG #ifndef CONFIG_CRYPTO_ACC_GECKO_TRNG
size_t available = TRNG0->FIFOLEVEL * 4; size_t available = TRNG0->FIFOLEVEL * 4;
#else #else
size_t available = CRYPTOACC_RNGCTRL->FIFOLEVEL * 4; size_t available = S2_FIFO_LEVEL * 4;
#endif #endif
if (available == 0) { if (available == 0) {
@ -109,7 +128,7 @@ static int entropy_gecko_trng_init(const struct device *dev)
CMU_ClockEnable(cmuClock_CRYPTOACC, true); CMU_ClockEnable(cmuClock_CRYPTOACC, true);
/* Enable TRNG */ /* Enable TRNG */
CRYPTOACC_RNGCTRL->RNGCTRL |= CRYPTOACC_RNGCTRL_ENABLE; S2_CTRL |= S2_CTRL_ENABLE;
#endif #endif
return 0; return 0;