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drivers: entropy: sf32lb: add trng driver support

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Add trng driver for sf32lb platform

Signed-off-by: Qingsong Gou <gouqs@hotmail.com>
This commit is contained in:
Qingsong Gou
2025-10-29 15:05:53 +08:00
committed by Anas Nashif
parent b346fc3db4
commit 4519041538
4 changed files with 98 additions and 0 deletions
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1
drivers/entropy/CMakeLists.txt
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@@ -37,6 +37,7 @@ zephyr_library_sources_ifdef(CONFIG_ENTROPY_PSA_CRYPTO_RNG entropy_psa_crypto.c)
zephyr_library_sources_ifdef(CONFIG_ENTROPY_RENESAS_RA entropy_renesas_ra.c)
zephyr_library_sources_ifdef(CONFIG_ENTROPY_RV32M1_TRNG entropy_rv32m1_trng.c)
zephyr_library_sources_ifdef(CONFIG_ENTROPY_SAM_RNG entropy_sam.c)
zephyr_library_sources_ifdef(CONFIG_ENTROPY_SF32LB entropy_sf32lb.c)
zephyr_library_sources_ifdef(CONFIG_ENTROPY_SILABS_SIWX91X entropy_silabs_siwx91x.c)
zephyr_library_sources_ifdef(CONFIG_ENTROPY_SMARTBOND_TRNG entropy_smartbond.c)
zephyr_library_sources_ifdef(CONFIG_ENTROPY_STM32_RNG entropy_stm32.c)

1
drivers/entropy/Kconfig
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@@ -43,6 +43,7 @@ source "drivers/entropy/Kconfig.psa_crypto"
source "drivers/entropy/Kconfig.renesas_ra"
source "drivers/entropy/Kconfig.rv32m1"
source "drivers/entropy/Kconfig.sam"
source "drivers/entropy/Kconfig.sf32lb"
source "drivers/entropy/Kconfig.siwx91x"
source "drivers/entropy/Kconfig.smartbond"
source "drivers/entropy/Kconfig.stm32"

10
drivers/entropy/Kconfig.sf32lb Normal file
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@@ -0,0 +1,10 @@
# Copyright (c) 2025, Qingsong Gou <gouqs@hotmail.com>
# SPDX-License-Identifier: Apache-2.0
config ENTROPY_SF32LB
bool "SF32LB Entropy driver"
default y
depends on DT_HAS_SIFLI_SF32LB_TRNG_ENABLED
select ENTROPY_HAS_DRIVER
help
Enable driver for SF32LB True Random Number Generator (TRNG).

86
drivers/entropy/entropy_sf32lb.c Normal file
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@@ -0,0 +1,86 @@
/*
* Copyright (c) 2025 Qingsong Gou <gouqs@hotmail.com>
* SPDX-License-Identifier: Apache-2.0
*/
#define DT_DRV_COMPAT sifli_sf32lb_trng
#include <zephyr/arch/cpu.h>
#include <zephyr/device.h>
#include <zephyr/drivers/clock_control/sf32lb.h>
#include <zephyr/drivers/entropy.h>
#include <zephyr/logging/log.h>
#include <register.h>
LOG_MODULE_REGISTER(entropy_sf32lb, CONFIG_ENTROPY_LOG_LEVEL);
#define TRNG_CTRL offsetof(TRNG_TypeDef, CTRL)
#define TRNG_STAT offsetof(TRNG_TypeDef, STAT)
#define TRNG_RAND offsetof(TRNG_TypeDef, RAND_NUM0)
#define TRNG_RAND_NUM_MAX (8U)
#define TRNG_RAND_MASK (TRNG_RAND_NUM_MAX - 1U)
struct entropy_sf32lb_config {
uintptr_t base;
struct sf32lb_clock_dt_spec clock;
};
static int entropy_sf32lb_get_entropy(const struct device *dev, uint8_t *buffer, uint16_t length)
{
const struct entropy_sf32lb_config *config = dev->config;
uint32_t buf[TRNG_RAND_NUM_MAX];
uint16_t bytes;
while (length) {
sys_set_bit(config->base + TRNG_CTRL, TRNG_CTRL_GEN_SEED_START_Pos);
while (!sys_test_bit(config->base + TRNG_STAT, TRNG_STAT_SEED_VALID_Pos)) {
}
/* Generate random data */
sys_set_bit(config->base + TRNG_CTRL, TRNG_CTRL_GEN_RAND_NUM_START_Pos);
while (!sys_test_bit(config->base + TRNG_STAT, TRNG_STAT_RAND_NUM_VALID_Pos)) {
}
for (uint8_t i = 0U; i < TRNG_RAND_NUM_MAX; i++) {
buf[i] = sys_read32(config->base + TRNG_RAND + (i * 4U));
}
bytes = MIN(length, sizeof(buf));
memcpy(buffer, buf, bytes);
length -= bytes;
buffer += bytes;
}
return 0;
}
static DEVICE_API(entropy, entropy_sf32lb_api) = {
.get_entropy = entropy_sf32lb_get_entropy,
};
static int entropy_sf32lb_init(const struct device *dev)
{
const struct entropy_sf32lb_config *config = dev->config;
if (!sf32lb_clock_is_ready_dt(&config->clock)) {
return -ENODEV;
}
return sf32lb_clock_control_on_dt(&config->clock);
}
#define ENTROPY_SF32LB_DEFINE(n) \
static const struct entropy_sf32lb_config entropy_sf32lb_config_##n = { \
.base = DT_INST_REG_ADDR(n), \
.clock = SF32LB_CLOCK_DT_INST_SPEC_GET(n), \
}; \
\
DEVICE_DT_INST_DEFINE(n, entropy_sf32lb_init, NULL, NULL, \
&entropy_sf32lb_config_##n, PRE_KERNEL_1, \
CONFIG_ENTROPY_INIT_PRIORITY, &entropy_sf32lb_api);
DT_INST_FOREACH_STATUS_OKAY(ENTROPY_SF32LB_DEFINE)