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nrf_cc310: Adding CC310 entropy driver utilizing nrf_cc310_platform lib
-Adding hw_cc310 driver with RTOS mutex/abort support -Changing entropy_cc310 driver to use nrf_cc310_platform library -Changing entropy_cc310 driver to support non-secure application Signed-off-by: Frank Audun Kvamtrø <[email protected]> Signed-off-by: Torsten Rasmussen <[email protected]>
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‎drivers/CMakeLists.txt‎

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@@ -15,3 +15,5 @@ add_subdirectory_ifdef(CONFIG_BT_LL_NRFXLIB bt_ll_nrfxlib)
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add_subdirectory_ifdef(CONFIG_NRF9160_GPS nrf9160_gps)
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add_subdirectory_ifdef(CONFIG_FPROTECT fprotect)
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add_subdirectory(flash_patch)
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add_subdirectory_ifdef(CONFIG_HW_CC310 hw_cc310)
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add_subdirectory(entropy)

‎drivers/Kconfig‎

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@@ -10,6 +10,8 @@ rsource "adp536x/Kconfig"
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rsource "at_cmd/Kconfig"
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rsource "gps_sim/Kconfig"
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rsource "entropy/Kconfig"
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rsource "hw_cc310/Kconfig"
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rsource "nrf9160_gps/Kconfig"
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rsource "lte_link_control/Kconfig"
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rsource "net/Kconfig"

‎drivers/entropy/CMakeLists.txt‎

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#
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# Copyright (c) 2019 Nordic Semiconductor
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#
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# SPDX-License-Identifier: LicenseRef-BSD-5-Clause-Nordic
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#
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zephyr_library_amend()
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zephyr_library_sources_if_kconfig(entropy_cc310.c)
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# Link with the nrf_cc310 platform library if the following is met:
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# -nRF52840 device
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# -nRF9160 device that is not using SPM
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# -nRF9150 device that is using SPM and in a secure image
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# (CONFIG_SPM is not defined in a secure image)
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if (CONFIG_SOC_NRF52840 OR (CONFIG_SOC_NRF9160 AND (NOT CONFIG_SPM)))
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zephyr_link_libraries_ifdef(CONFIG_ENTROPY_CC310 ${IMAGE}platform_cc310)
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endif ()

‎drivers/entropy/Kconfig‎

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# Kconfig - Arm CC310 entropy driver for nRF52840 and nRF9160
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#
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# Copyright (c) 2019 Nordic Semiconductor
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#
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# SPDX-License-Identifier: LicenseRef-BSD-5-Clause-Nordic
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#
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config ENTROPY_CC310
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bool "Arm CC310 RNG driver for Nordic devices"
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depends on HW_CC310 || (SOC_NRF9160 && SPM)
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depends on ENTROPY_GENERATOR
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select ENTROPY_HAS_DRIVER
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select ENTROPY_NRF_FORCE_ALT
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default y
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help
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This option enables the Arm CC310 RNG devices in nRF52840 and nRF9160
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devices. This is dependent on CC310 being enabled in nrf_security.

‎drivers/entropy/entropy_cc310.c‎

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/*
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* Copyright (c) 2019 Nordic Semiconductor ASA
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*
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* SPDX-License-Identifier: LicenseRef-BSD-5-Clause-Nordic
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*/
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#include <init.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <assert.h>
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#include <zephyr.h>
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#include <drivers/entropy.h>
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#if CONFIG_ENTROPY_CC310
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#if defined(CONFIG_SPM)
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#include "secure_services.h"
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#else
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#include "nrf_cc310_platform_entropy.h"
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#endif
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static int entropy_cc310_rng_get_entropy(struct device *dev, u8_t *buffer,
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u16_t length)
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{
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int res = -EINVAL;
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size_t olen;
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__ASSERT_NO_MSG(dev != NULL);
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__ASSERT_NO_MSG(buffer != NULL);
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#if defined(CONFIG_SPM)
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/** This is a call from a non-secure app that enables secure services,
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* in which case entropy is gathered by calling through SPM
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*/
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res = spm_request_random_number(buffer, length, &olen);
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if (olen != length) {
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return -EINVAL;
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}
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#else
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/** This is a call from a secure app, in which case entropy is gathered
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* using CC310 HW using the nrf_cc310_platform library.
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*/
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res = nrf_cc310_platform_entropy_get(buffer, length, &olen);
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if (olen != length) {
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return -EINVAL;
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}
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#endif
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return res;
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}
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static int entropy_cc310_rng_init(struct device *dev)
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{
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/* No initialization is required */
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(void)dev;
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return 0;
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}
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static const struct entropy_driver_api entropy_cc310_rng_api = {
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.get_entropy = entropy_cc310_rng_get_entropy
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};
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DEVICE_AND_API_INIT(entropy_cc310_rng, CONFIG_ENTROPY_NAME,
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&entropy_cc310_rng_init,
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NULL,
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NULL,
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POST_KERNEL, CONFIG_KERNEL_INIT_PRIORITY_DEVICE,
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&entropy_cc310_rng_api);
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#endif /* CONFIG_ENTROPY_CC310 */

‎drivers/hw_cc310/CMakeLists.txt‎

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#
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# Copyright (c) 2019 Nordic Semiconductor
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#
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# SPDX-License-Identifier: LicenseRef-BSD-5-Clause-Nordic
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#
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zephyr_library()
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zephyr_library_sources(hw_cc310.c)
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# Link with the nrf_cc310 platform library
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zephyr_library_link_libraries(${IMAGE}platform_cc310)

‎drivers/hw_cc310/Kconfig‎

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# Kconfig - Arm CC310 hw driver for nRF52840 and nRF9160
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#
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# Copyright (c) 2019 Nordic Semiconductor
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#
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# SPDX-License-Identifier: LicenseRef-BSD-5-Clause-Nordic
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#
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config HW_CC310_FORCE_ALT
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bool
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depends on SOC_COMPATIBLE_NRF
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help
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This option can be enabled to force an alternative implementation of
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the Arm CC310 hardware driver.
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if !HW_CC310_FORCE_ALT
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menuconfig HW_CC310
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bool "Arm CC310 hw driver for Nordic devices"
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depends on SOC_NRF52840 || (SOC_NRF9160 && !SPM) || (SOC_NRF9160 && TRUSTED_EXECUTION_SECURE)
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select NRF_CC310_PLATFORM
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default y if SOC_NRF52840 || (SOC_NRF9160 && !SPM) || (SOC_NRF9160 && TRUSTED_EXECUTION_SECURE)
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help
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This option enables the Arm CC310 hw devices in nRF52840 and nRF9160 devices.
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if HW_CC310
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config HW_CC310_NAME
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string "Entropy Device Name"
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default "HW_CC310_0"
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help
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Specify the device name to be used for the HW_CC310 driver.
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endif # HW_CC310
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endif # !HW_CC310_FORCE_ALT

‎drivers/hw_cc310/hw_cc310.c‎

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/*
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* Copyright (c) 2019 Nordic Semiconductor ASA
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*
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* SPDX-License-Identifier: LicenseRef-BSD-5-Clause-Nordic
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*/
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#include <init.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <zephyr.h>
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#if CONFIG_HW_CC310
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#include "nrf_cc310_platform.h"
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static int hw_cc310_init(struct device *dev)
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{
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int res;
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__ASSERT_NO_MSG(dev != NULL);
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/* Set the RTOS abort APIs */
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nrf_cc310_platform_abort_init();
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/* Set the RTOS mutex APIs */
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nrf_cc310_platform_mutex_init();
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/* Initialize the cc310 HW with or without RNG support */
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#if CONFIG_ENTROPY_CC310
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res = nrf_cc310_platform_init();
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#else
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res = nrf_cc310_platform_init_no_rng();
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#endif
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return res;
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}
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DEVICE_INIT(hw_cc310, CONFIG_HW_CC310_NAME, hw_cc310_init,
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NULL, NULL, POST_KERNEL, CONFIG_KERNEL_INIT_PRIORITY_DEFAULT);
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#endif /* CONFIG_HW_CC310 */

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