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drivers: entropy: Port the LL rand driver to entropy

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The rand driver present in the BLE Link Layer is able to provide
entropy for both threads and ISRs, and so it is more suited to be used
as a generic nRF5x entropy driver instead of the current one. This will
allow applications and the Link Layer to use the same driver without
duplicating it.

Signed-off-by: Carles Cufi <carles.cufi@nordicsemi.no>
Signed-off-by: Vinayak Kariappa Chettimada <vich@nordicsemi.no>
This commit is contained in:
Carles Cufi 2018-02-20 21:24:07 +01:00 • committed by Carles Cufí
commit 813b41beec
3 changed files with 290 additions and 62 deletions
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48
drivers/entropy/Kconfig.nrf5
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@ -1,21 +1,21 @@
# Kconfig.nrf5 - nRF5 entropy generator driver configuration
#
# Copyright (c) 2017 Nordic Semiconductor ASA
# Copyright (c) 2018 Nordic Semiconductor ASA
# Copyright (c) 2017 Exati Tecnologia Ltda.
#
# SPDX-License-Identifier: Apache-2.0
menuconfig ENTROPY_NRF5_RNG
bool "nRF5 RNG driver"
# FIXME: nRF5 RNG driver can't co-exist with Bluetooth's HAL
# implementation yet
depends on ENTROPY_GENERATOR && !BT
depends on ENTROPY_GENERATOR
select ENTROPY_HAS_DRIVER
help
This option enables the RNG peripheral, which is a random number
generator, based on internal thermal noise, that provides a
random 8-bit value to the host when read.
if ENTROPY_NRF5_RNG
config ENTROPY_NRF5_BIAS_CORRECTION
bool "Enable bias correction (uniform distribution)"
depends on ENTROPY_NRF5_RNG
@ -23,3 +23,43 @@ config ENTROPY_NRF5_BIAS_CORRECTION
This option enables the RNG bias correction, which guarantees a
uniform distribution of 0 and 1. When this option is enabled, the time
to generate a byte cannot be guaranteed.
config ENTROPY_NRF5_THR_THRESHOLD
int "Thread-mode low-water threshold"
range 4 255
help
Low-water threshold in bytes to trigger entropy generation for
thread mode consumers.
config ENTROPY_NRF5_ISR_THRESHOLD
int "ISR low-water threshold"
range 12 255
help
Low-water threshold in bytes to trigger entropy generation for
ISR consumers.
config ENTROPY_NRF5_THR_BUF_LEN
int "Thread-mode buffer length"
range ENTROPY_NRF5_THR_THRESHOLD 255
help
Buffer length in bytes to pre-store entropy generation for
thread mode consumers.
config ENTROPY_NRF5_ISR_BUF_LEN
int "ISR buffer length"
range ENTROPY_NRF5_ISR_THRESHOLD 255
help
Buffer length in bytes to pre-store entropy generation for
ISR consumers.
config ENTROPY_NRF5_PRI
int "RNG interrupt priority"
depends on ENTROPY_NRF5_RNG
range 0 2 if SOC_SERIES_NRF51X
range 0 5 if SOC_SERIES_NRF52X
default 2 if SOC_SERIES_NRF51X
default 5 if SOC_SERIES_NRF52X
help
nRF5X RNG IRQ priority.
endif #ENTROPY_NRF5_RNG