2347932431
Add support for TRNG peripherals that lack interrupt lines in the STM32 entropy driver. This enables usage of the TRNG of STM32WB05/06/07 SoCs with the driver. Signed-off-by: Mathieu Choplain <mathieu.choplain@st.com>
84 lines
2.2 KiB
C
84 lines
2.2 KiB
C
/*
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* Copyright (c) 2025 STMicroelectronics
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*
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* SPDX-License-Identifier: Apache-2.0
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*/
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#include <zephyr/kernel.h>
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#include <zephyr/device.h>
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#include <stm32_ll_rng.h>
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/**
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* This driver supports two compatibles:
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* - "st,stm32-rng" for TRNG with IRQ lines
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* - "st,stm32-rng-noirq" for TRNG without IRQ lines
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*/
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#define IRQLESS_TRNG DT_HAS_COMPAT_STATUS_OKAY(st_stm32_rng_noirq)
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#if IRQLESS_TRNG
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#define DT_DRV_COMPAT st_stm32_rng_noirq
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#define TRNG_GENERATION_DELAY K_NSEC(DT_INST_PROP_OR(0, generation_delay_ns, 0))
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#else /* !IRQLESS_TRNG */
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#define DT_DRV_COMPAT st_stm32_rng
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#define IRQN DT_INST_IRQN(0)
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#define IRQ_PRIO DT_INST_IRQ(0, priority)
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#endif /* IRQLESS_TRNG */
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/* Cross-series LL compatibility wrappers */
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static inline void ll_rng_enable_it(RNG_TypeDef *RNGx)
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{
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/* Silence "unused" warning on IRQ-less hardware*/
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ARG_UNUSED(RNGx);
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#if !IRQLESS_TRNG
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LL_RNG_EnableIT(RNGx);
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#endif /* !IRQLESS_TRNG */
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}
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static inline uint32_t ll_rng_is_active_seis(RNG_TypeDef *RNGx)
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{
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#if defined(CONFIG_SOC_SERIES_STM32WB0X)
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return LL_RNG_IsActiveFlag_FAULT(RNGx);
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#else
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return LL_RNG_IsActiveFlag_SEIS(RNGx);
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#endif /* CONFIG_SOC_SERIES_STM32WB0X */
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}
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static inline void ll_rng_clear_seis(RNG_TypeDef *RNGx)
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{
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#if defined(CONFIG_SOC_SERIES_STM32WB0X)
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LL_RNG_ClearFlag_FAULT(RNGx);
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#else
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LL_RNG_ClearFlag_SEIS(RNGx);
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#endif /* CONFIG_SOC_SERIES_STM32WB0X */
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}
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static inline uint32_t ll_rng_is_active_secs(RNG_TypeDef *RNGx)
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{
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#if !defined(CONFIG_SOC_SERIES_STM32WB0X)
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return LL_RNG_IsActiveFlag_SECS(RNGx);
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#else
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/**
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* STM32WB0x RNG has no equivalent of SECS.
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* Since this flag is always checked in conjunction
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* with FAULT (the SEIS equivalent), returning 0 is OK.
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*/
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return 0;
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#endif /* !CONFIG_SOC_SERIES_STM32WB0X */
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}
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static inline uint32_t ll_rng_is_active_drdy(RNG_TypeDef *RNGx)
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{
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#if defined(CONFIG_SOC_SERIES_STM32WB0X)
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return LL_RNG_IsActiveFlag_RNGRDY(RNGx);
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#else
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return LL_RNG_IsActiveFlag_DRDY(RNGx);
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#endif /* CONFIG_SOC_SERIES_STM32WB0X */
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}
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static inline uint16_t ll_rng_read_rand_data(RNG_TypeDef *RNGx)
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{
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#if defined(CONFIG_SOC_SERIES_STM32WB0X)
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return LL_RNG_ReadRandData16(RNGx);
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#else
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return (uint16_t)LL_RNG_ReadRandData32(RNGx);
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#endif /* CONFIG_SOC_SERIES_STM32WB0X */
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}
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