42 lines
960 B
C
42 lines
960 B
C
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/* Copyright 2014 The Chromium OS Authors. All rights reserved.
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* Use of this source code is governed by a BSD-style license that can be
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* found in the LICENSE file.
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*/
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#ifndef __CROS_EC_CRC_HW_H
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#define __CROS_EC_CRC_HW_H
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/* CRC-32 hardware implementation with USB constants */
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#include "clock.h"
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#include "registers.h"
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static inline void crc32_init(void)
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{
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/* switch on CRC controller */
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STM32_RCC_AHBENR |= BIT(6); /* switch on CRC controller */
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/* Delay 1 AHB clock cycle after the clock is enabled */
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clock_wait_bus_cycles(BUS_AHB, 1);
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/* reset CRC state */
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STM32_CRC_CR = STM32_CRC_CR_RESET | STM32_CRC_CR_REV_OUT
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| STM32_CRC_CR_REV_IN_WORD;
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while (STM32_CRC_CR & 1)
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;
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}
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static inline void crc32_hash32(uint32_t val)
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{
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STM32_CRC_DR = val;
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}
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static inline void crc32_hash16(uint16_t val)
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{
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STM32_CRC_DR16 = val;
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}
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static inline uint32_t crc32_result(void)
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{
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return STM32_CRC_DR ^ 0xFFFFFFFF;
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}
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#endif /* __CROS_EC_CRC_HW_H */
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