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random: add MCUX TRNG driver

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Provide a random driver wrapped around the MCUX TRNG driver.

Change-Id: Icbd7ab587aa18ecbd7eae52290aaa5d8ee504cf2
Origin: Original
Signed-off-by: Bogdan Davidoaia <bogdan.davidoaia@linaro.org>
This commit is contained in:
Bogdan Davidoaia 2017-02-28 13:24:43 +02:00 • committed by Kumar Gala
commit 5473906993
5 changed files with 81 additions and 0 deletions
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6
arch/arm/soc/nxp_kinetis/Kconfig
View file

@ -45,6 +45,12 @@ config HAS_RNGA
help
Set if the random number generator accelerator (RNGA) module is present in the SoC.
config HAS_TRNG
bool
default n
help
Set if the true random number generator (TRNG) module is present in the SoC.
config HAS_LPUART
bool
default n

9
drivers/random/Kconfig.mcux
View file

@ -12,3 +12,12 @@ menuconfig RANDOM_MCUX_RNGA
help
This option enables the random number generator accelerator (RNGA)
driver based on the MCUX RNGA driver.
menuconfig RANDOM_MCUX_TRNG
bool "MCUX TRNG driver"
depends on RANDOM_GENERATOR && HAS_TRNG
default n
select RANDOM_HAS_DRIVER
help
This option enables the true random number generator (TRNG)
driver based on the MCUX TRNG driver.

1
drivers/random/Makefile
View file

@ -1,3 +1,4 @@
obj-$(CONFIG_RANDOM_MCUX_RNGA) += random_mcux_rnga.o
obj-$(CONFIG_RANDOM_MCUX_TRNG) += random_mcux_trng.o
obj-$(CONFIG_TIMER_RANDOM_GENERATOR) = rand32_timer.o
obj-$(CONFIG_X86_TSC_RANDOM_GENERATOR) += rand32_timestamp.o

64
drivers/random/random_mcux_trng.c Normal file
View file

@ -0,0 +1,64 @@
/*
* Copyright (c) 2017 Linaro Limited.
*
* SPDX-License-Identifier: Apache-2.0
*/
#include <device.h>
#include <random.h>
#include <drivers/rand32.h>
#include <init.h>
#include "fsl_trng.h"
static int random_mcux_trng_get_entropy(struct device *dev, uint8_t *buffer,
uint16_t length)
{
status_t status;
ARG_UNUSED(dev);
status = TRNG_GetRandomData(TRNG0, buffer, length);
__ASSERT_NO_MSG(!status);
return 0;
}
static const struct random_driver_api random_mcux_trng_api_funcs = {
.get_entropy = random_mcux_trng_get_entropy
};
static int random_mcux_trng_init(struct device *);
DEVICE_AND_API_INIT(random_mcux_trng, CONFIG_RANDOM_NAME,
random_mcux_trng_init, NULL, NULL,
PRE_KERNEL_2, CONFIG_KERNEL_INIT_PRIORITY_DEVICE,
&random_mcux_trng_api_funcs);
static int random_mcux_trng_init(struct device *dev)
{
trng_config_t conf;
status_t status;
ARG_UNUSED(dev);
status = TRNG_GetDefaultConfig(&conf);
__ASSERT_NO_MSG(!status);
status = TRNG_Init(TRNG0, &conf);
__ASSERT_NO_MSG(!status);
return 0;
}
uint32_t sys_rand32_get(void)
{
uint32_t output;
int rc;
rc = random_mcux_trng_get_entropy(DEVICE_GET(random_mcux_trng),
(uint8_t *) &output, sizeof(output));
__ASSERT_NO_MSG(!rc);
return output;
}

1
ext/hal/nxp/mcux/drivers/Makefile
View file

@ -7,6 +7,7 @@
obj-$(CONFIG_ETH_MCUX) += fsl_enet.o
obj-$(CONFIG_I2C_MCUX) += fsl_i2c.o
obj-$(CONFIG_RANDOM_MCUX_RNGA) += fsl_rnga.o
obj-$(CONFIG_RANDOM_MCUX_TRNG) += fsl_trng.o
obj-$(CONFIG_SOC_FLASH_MCUX) += fsl_flash.o
obj-$(CONFIG_SPI_MCUX) += fsl_dspi.o
obj-$(CONFIG_UART_MCUX) += fsl_uart.o