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drivers: bluetooth: hci: Use TRNG peripheral for BLE purpose on WB0x

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Call entropy APIs to use TRNG peripheral on STM32WB0x devices for BLE
purposes.

Enable RNG node on Nucleo-WB0x boards.

Remove RNG initialization as it's done in the entropy driver.

Signed-off-by: Ali Hozhabri <ali.hozhabri@st.com>
This commit is contained in:
Ali Hozhabri 2025-05-15 11:26:58 +02:00 • committed by Dan Kalowsky
commit ecf795f0f1
4 changed files with 40 additions and 2 deletions
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5
boards/st/nucleo_wb05kz/nucleo_wb05kz.dts
View file

@ -24,6 +24,7 @@
zephyr,sram = &sram0;
zephyr,flash = &flash0;
zephyr,bt-c2h-uart = &usart1;
zephyr,entropy = &rng;
};
leds: leds {
@ -167,6 +168,10 @@
};
};
&rng {
status = "okay";
};
&flash0 {
partitions {
compatible = "fixed-partitions";

5
boards/st/nucleo_wb07cc/nucleo_wb07cc.dts
View file

@ -24,6 +24,7 @@
zephyr,sram = &sram0;
zephyr,flash = &flash0;
zephyr,bt-c2h-uart = &usart1;
zephyr,entropy = &rng;
};
leds: leds {
@ -164,6 +165,10 @@
};
};
&rng {
status = "okay";
};
&flash0 {
partitions {
compatible = "fixed-partitions";

5
boards/st/nucleo_wb09ke/nucleo_wb09ke.dts
View file

@ -24,6 +24,7 @@
zephyr,sram = &sram0;
zephyr,flash = &flash0;
zephyr,bt-c2h-uart = &usart1;
zephyr,entropy = &rng;
};
leds: leds {
@ -166,6 +167,10 @@
};
};
&rng {
status = "okay";
};
&flash0 {
partitions {
compatible = "fixed-partitions";

27
drivers/bluetooth/hci/hci_stm32wb0.c
View file

@ -10,6 +10,7 @@
#include <zephyr/sys/byteorder.h>
#include <zephyr/bluetooth/hci_types.h>
#include <zephyr/drivers/bluetooth.h>
#include <zephyr/drivers/entropy.h>
#include "bleplat_cntr.h"
#include "ble_stack.h"
#include "stm32wb0x_hal_radio_timer.h"
@ -20,7 +21,6 @@
#include "dm_alloc.h"
#include "aci_adv_nwk.h"
#include "app_common.h"
#include "hw_rng.h"
#include "hw_aes.h"
#include "hw_pka.h"
@ -301,6 +301,30 @@ static void ble_isr_installer(void)
IRQ_CONNECT(PKA_IRQn, PKA_PRIO, _PKA_IRQHandler, NULL, PKA_FLAGS);
}
static void rng_get_random(void *num, size_t size)
{
const struct device *dev = DEVICE_DT_GET(DT_DRV_INST(0));
int res;
/* try to allocate from pool */
res = entropy_get_entropy_isr(dev, (uint8_t *)num, size, !ENTROPY_BUSYWAIT);
if (res != size) {
/* Not enough available random numbers, so it falls back to polling */
entropy_get_entropy_isr(dev, (uint8_t *)num, size, ENTROPY_BUSYWAIT);
}
}
/* BLEPLAT_RngGetRandomXX definitions are needed for the BLE library. */
void BLEPLAT_RngGetRandom16(uint16_t *num)
{
rng_get_random(num, sizeof(*num));
}
void BLEPLAT_RngGetRandom32(uint32_t *num)
{
rng_get_random(num, sizeof(*num));
}
static struct net_buf *get_rx(uint8_t *msg)
{
bool discardable = false;
@ -465,7 +489,6 @@ static int bt_hci_stm32wb0_open(const struct device *dev, bt_hci_recv_t recv)
HAL_RADIO_Init(&hradio);
HAL_RADIO_TIMER_Init(&VTIMER_InitStruct);
HW_RNG_Init();
HW_AES_Init();
hpka.Instance = PKA;
HAL_PKA_Init(&hpka);