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drivers: entropy: Add Gecko trng driver for EFR32BG22

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This commit enables entropy driver on EFR32BG22 SoC.

Signed-off-by: Mateusz Sierszulski <msierszulski@antmicro.com>
This commit is contained in:
Mateusz Sierszulski 2022-09-13 13:30:52 +02:00 • committed by Fabio Baltieri
commit b36a31fd7a
5 changed files with 40 additions and 0 deletions
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4
boards/arm/efr32bg_sltb010a/efr32bg_sltb010a.dts
View file

@ -115,3 +115,7 @@
&stimer0 { &stimer0 {
status = "okay"; status = "okay";
}; };
&trng {
status = "okay";
};

1
drivers/entropy/Kconfig.gecko
View file

@ -9,6 +9,7 @@ config ENTROPY_GECKO_TRNG
default y default y
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
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.

21
drivers/entropy/entropy_gecko_trng.c
View file

@ -13,6 +13,7 @@
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
uint32_t tmp; uint32_t tmp;
uint32_t *data = (uint32_t *) output; uint32_t *data = (uint32_t *) output;
@ -28,6 +29,9 @@ static void entropy_gecko_trng_read(uint8_t *output, size_t len)
tmp = TRNG0->FIFO; tmp = TRNG0->FIFO;
memcpy(data, (const uint8_t *) &tmp, len); memcpy(data, (const uint8_t *) &tmp, len);
} }
#else
memcpy(output, ((const uint8_t *) CRYPTOACC_RNGOUT_FIFO_S_MEM_BASE), len);
#endif
} }
static int entropy_gecko_trng_get_entropy(const struct device *dev, static int entropy_gecko_trng_get_entropy(const struct device *dev,
@ -40,7 +44,11 @@ static int entropy_gecko_trng_get_entropy(const struct device *dev,
ARG_UNUSED(dev); ARG_UNUSED(dev);
while (length) { while (length) {
#ifndef CONFIG_CRYPTO_ACC_GECKO_TRNG
available = TRNG0->FIFOLEVEL * 4; available = TRNG0->FIFOLEVEL * 4;
#else
available = CRYPTOACC_RNGCTRL->FIFOLEVEL * 4;
#endif
if (available == 0) { if (available == 0) {
return -EINVAL; return -EINVAL;
} }
@ -63,7 +71,11 @@ static int entropy_gecko_trng_get_entropy_isr(const struct device *dev,
/* No busy wait; return whatever data is available. */ /* No busy wait; return whatever data is available. */
size_t count; size_t count;
#ifndef CONFIG_CRYPTO_ACC_GECKO_TRNG
size_t available = TRNG0->FIFOLEVEL * 4; size_t available = TRNG0->FIFOLEVEL * 4;
#else
size_t available = CRYPTOACC_RNGCTRL->FIFOLEVEL * 4;
#endif
if (available == 0) { if (available == 0) {
return -ENODATA; return -ENODATA;
@ -87,10 +99,19 @@ static int entropy_gecko_trng_get_entropy_isr(const struct device *dev,
static int entropy_gecko_trng_init(const struct device *dev) static int entropy_gecko_trng_init(const struct device *dev)
{ {
/* Enable the TRNG0 clock. */ /* Enable the TRNG0 clock. */
#ifndef CONFIG_CRYPTO_ACC_GECKO_TRNG
CMU_ClockEnable(cmuClock_TRNG0, true); CMU_ClockEnable(cmuClock_TRNG0, true);
/* Enable TRNG0. */ /* Enable TRNG0. */
TRNG0->CONTROL = TRNG_CONTROL_ENABLE; TRNG0->CONTROL = TRNG_CONTROL_ENABLE;
#else
/* Enable the CRYPTO ACC clock. */
CMU_ClockEnable(cmuClock_CRYPTOACC, true);
/* Enable TRNG */
CRYPTOACC_RNGCTRL->RNGCTRL |= CRYPTOACC_RNGCTRL_ENABLE;
#endif
return 0; return 0;
} }

8
dts/arm/silabs/efr32bg22.dtsi
View file

@ -13,6 +13,7 @@
/ { / {
chosen { chosen {
zephyr,flash-controller = &msc; zephyr,flash-controller = &msc;
zephyr,entropy = &trng;
}; };
power-states { power-states {
@ -69,6 +70,13 @@
status = "disabled"; status = "disabled";
}; };
trng: trng@4c021000 {
compatible = "silabs,gecko-trng";
reg = <0x4C021000 0x1000>;
status = "disabled";
interrupts = <0x1 0x0>;
};
i2c0: i2c@5a010000 { i2c0: i2c@5a010000 {
compatible = "silabs,gecko-i2c"; compatible = "silabs,gecko-i2c";
clock-frequency = <I2C_BITRATE_STANDARD>; clock-frequency = <I2C_BITRATE_STANDARD>;

6
soc/arm/silabs_exx32/Kconfig
View file

@ -134,6 +134,12 @@ choice SOC_GECKO_EMU_DCDC_MODE
bool "Bypass" bool "Bypass"
endchoice endchoice
config CRYPTO_ACC_GECKO_TRNG
bool
help
Enable Entropy driver based on the CRYPTO_ACC module for Silicon Labs
Gecko chips.
config SOC_GECKO_DEV_INIT config SOC_GECKO_DEV_INIT
bool bool
help help