2019-11-01 20:45:29 +08:00
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# STM32 entropy generator driver configuration
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2017-10-14 07:30:55 +08:00
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# Copyright (c) 2017 Erwin Rol <erwin@erwinrol.com>
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# SPDX-License-Identifier: Apache-2.0
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2020-04-03 22:18:59 +08:00
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DT_COMPAT_ST_STM32_RNG := st,stm32-rng
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2020-08-31 23:46:01 +08:00
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menuconfig ENTROPY_STM32_RNG
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2017-10-14 07:30:55 +08:00
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bool "STM32 RNG driver"
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2017-10-14 08:16:59 +08:00
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depends on SOC_FAMILY_STM32
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2017-10-14 07:30:55 +08:00
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select ENTROPY_HAS_DRIVER
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2017-10-31 18:56:57 +08:00
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select USE_STM32_LL_RNG
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2020-04-03 22:18:59 +08:00
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default $(dt_compat_enabled,$(DT_COMPAT_ST_STM32_RNG))
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2017-10-14 07:30:55 +08:00
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help
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This option enables the RNG processor, which is a entropy number
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generator, based on a continuous analog noise, that provides
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2018-07-02 00:15:15 +08:00
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a entropy 32-bit value to the host when read. It is available for
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2020-08-31 23:46:01 +08:00
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F4 (except STM32F401 & STM32F411), L4, F7, H7 and G4 series.
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if ENTROPY_STM32_RNG
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config ENTROPY_STM32_THR_POOL_SIZE
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int "Thread-mode random number pool size"
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range ENTROPY_STM32_THR_THRESHOLD 256
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default 8
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help
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Buffer length in bytes used to store entropy bytes generated by the
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hardware to make them ready for thread mode consumers.
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Please note, that size of the pool must be a power of 2.
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config ENTROPY_STM32_THR_THRESHOLD
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int "Thread-mode random number pool low-water threshold"
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range 4 255
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help
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Low water-mark threshold in bytes to trigger entropy generation for
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thread mode consumers. As soon as the number of available bytes in the
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buffer goes below this number hardware entropy generation will be
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started.
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config ENTROPY_STM32_ISR_POOL_SIZE
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int "ISR-mode random number pool size"
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range ENTROPY_STM32_ISR_THRESHOLD 256
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default 16
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help
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Buffer length in bytes used to store entropy bytes generated by the
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hardware to make them ready for ISR consumers.
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Please note, that size of the pool must be a power of 2.
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config ENTROPY_STM32_ISR_THRESHOLD
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int "ISR-mode random number pool low-water threshold"
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range 12 255
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help
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Low water-mark threshold in bytes to trigger entropy generation for
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ISR consumers. As soon as the number of available bytes in the
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buffer goes below this number hardware entropy generation will be
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started.
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endif # ENTROPY_STM32_RNG
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