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drivers: entropy: Introduce SiWx91x entropy driver

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Support for random number generator is required for most of the
cryptographic operations, including support for WiFi and TLS.

This driver has been tested with tests/drivers/entropy:

    *** Booting Zephyr OS build v3.7.0-4339-g1ec5ce05f9f8 ***
    Running TESTSUITE entropy_api
    ===================================================================
    START - test_entropy_get_entropy
    random device is 0x8217298, name is rng@45090000
      0x93
      0x3e
      0xf1
      0x68
      0xd4
      0x22
      0xbf
      0x4d
      0xad
     PASS - test_entropy_get_entropy in 0.012 seconds
    ===================================================================
    TESTSUITE entropy_api succeeded

    ------ TESTSUITE SUMMARY START ------

    SUITE PASS - 100.00% [entropy_api]: pass = 1, fail = 0, skip = 0 ...
     - PASS - [entropy_api.test_entropy_get_entropy] duration = 0.01 ...

    ------ TESTSUITE SUMMARY END ------

    ===================================================================
    RunID: d1547c805699201af769cb01331efcce
    PROJECT EXECUTION SUCCESSFUL

Co-authored-by: Tibor Laczko <tibor.laczko@silabs.com>
Signed-off-by: Tibor Laczko <tibor.laczko@silabs.com>
Signed-off-by: Jérôme Pouiller <jerome.pouiller@silabs.com>
This commit is contained in:
Jérôme Pouiller 2025-01-31 12:05:14 +01:00 • committed by Benjamin Cabé
commit 938fb872de
6 changed files with 90 additions and 0 deletions
Download patch file Download diff file Expand all files Collapse all files

1
drivers/entropy/CMakeLists.txt
View file

@ -32,6 +32,7 @@ zephyr_library_sources_ifdef(CONFIG_ENTROPY_GECKO_TRNG entropy_gecko_trng.c
zephyr_library_sources_ifdef(CONFIG_ENTROPY_NEORV32_TRNG entropy_neorv32_trng.c)
zephyr_library_sources_ifdef(CONFIG_ENTROPY_BT_HCI entropy_bt_hci.c)
zephyr_library_sources_ifdef(CONFIG_ENTROPY_GECKO_SE entropy_gecko_se.c)
zephyr_library_sources_ifdef(CONFIG_ENTROPY_SILABS_SIWX91X entropy_silabs_siwx91x.c)
zephyr_library_sources_ifdef(CONFIG_ENTROPY_PSA_CRYPTO_RNG entropy_psa_crypto.c)
zephyr_library_sources_ifdef(CONFIG_ENTROPY_NPCX_DRBG entropy_npcx_drbg.c)
zephyr_library_sources_ifdef(CONFIG_ENTROPY_MAX32_TRNG entropy_max32.c)

1
drivers/entropy/Kconfig
View file

@ -33,6 +33,7 @@ source "drivers/entropy/Kconfig.native_posix"
source "drivers/entropy/Kconfig.rv32m1"
source "drivers/entropy/Kconfig.litex"
source "drivers/entropy/Kconfig.gecko"
source "drivers/entropy/Kconfig.siwx91x"
source "drivers/entropy/Kconfig.neorv32"
source "drivers/entropy/Kconfig.bt_hci"
source "drivers/entropy/Kconfig.psa_crypto"

11
drivers/entropy/Kconfig.siwx91x Normal file
View file

@ -0,0 +1,11 @@
# Copyright (c) 2024 Silicon Laboratories Inc.
# SPDX-License-Identifier: Apache-2.0
config ENTROPY_SILABS_SIWX91X
bool "SiWx91x RNG driver"
default y
depends on DT_HAS_SILABS_SIWX91X_RNG_ENABLED
select ENTROPY_HAS_DRIVER
help
Enable hardware Random Number Generator embedded on Silicon Labs
SiWx91x chips.

61
drivers/entropy/entropy_silabs_siwx91x.c Normal file
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@ -0,0 +1,61 @@
/*
* Copyright (c) 2024 Silicon Laboratories Inc.
* SPDX-License-Identifier: Apache-2.0
*/
#define DT_DRV_COMPAT silabs_siwx91x_rng
#include <zephyr/drivers/entropy.h>
#include "rsi_rom_rng.h"
#include "rsi_rom_clks.h"
static int siwx91x_get_entropy_isr(const struct device *dev, uint8_t *buffer,
uint16_t length, uint32_t flags)
{
uint32_t u32_count = length / sizeof(uint32_t);
uint32_t u8_count = u32_count * sizeof(uint32_t);
uint32_t u8_remainder = length - u8_count;
uint32_t swap_space;
if (!(flags & ENTROPY_BUSYWAIT)) {
return -ENOTSUP;
}
RSI_RNG_GetBytes((void *)dev->config, (uint32_t *)buffer, u32_count);
if (length % sizeof(uint32_t)) {
RSI_RNG_GetBytes((void *)dev->config, &swap_space, 1);
memcpy(buffer + u8_count, &swap_space, u8_remainder);
}
return 0;
}
static int siwx91x_get_entropy(const struct device *dev, uint8_t *buffer, uint16_t length)
{
return siwx91x_get_entropy_isr(dev, buffer, length, ENTROPY_BUSYWAIT);
}
static int siwx91x_init(const struct device *dev)
{
int ret;
ret = RSI_CLK_PeripheralClkEnable1(M4CLK, HWRNG_PCLK_ENABLE);
if (ret) {
return -EIO;
}
ret = RSI_RNG_Start((void *)dev->config, RSI_RNG_TRUE_RANDOM);
if (ret) {
return -EIO;
}
return 0;
}
static DEVICE_API(entropy, siwx91x_api) = {
.get_entropy = siwx91x_get_entropy,
.get_entropy_isr = siwx91x_get_entropy_isr,
};
#define SIWX91X_RNG_INIT(idx) \
DEVICE_DT_INST_DEFINE(idx, siwx91x_init, NULL, NULL, (void *)DT_INST_REG_ADDR(idx), \
PRE_KERNEL_1, CONFIG_ENTROPY_INIT_PRIORITY, &siwx91x_api);
DT_INST_FOREACH_STATUS_OKAY(SIWX91X_RNG_INIT)

12
dts/bindings/rng/silabs,siwx91x-rng.yaml Normal file
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@ -0,0 +1,12 @@
# Copyright (c) 2024 Silicon Laboratories Inc.
# SPDX-License-Identifier: Apache-2.0
description: Hardware Random Number Generator embedded on Silabs SiWx91x chips
compatible: "silabs,siwx91x-rng"
include: base.yaml
properties:
reg:
required: true

4
modules/hal_silabs/wiseconnect/CMakeLists.txt
View file

@ -50,5 +50,9 @@ zephyr_library_sources(
${WISECONNECT_DIR}/components/device/silabs/si91x/mcu/core/chip/src/iPMU_prog/iPMU_dotc/rsi_system_config_917.c
)
zephyr_library_sources_ifdef(CONFIG_ENTROPY_SILABS_SIWX91X
${WISECONNECT_DIR}/components/device/silabs/si91x/mcu/drivers/peripheral_drivers/src/rsi_rng.c
)
zephyr_linker_sources(ROM_SECTIONS linker/code_classification_text.ld)
zephyr_linker_sources(RAMFUNC_SECTION linker/code_classification_ramfunc.ld)