diff options
| author | Vic Yang <victoryang@chromium.org> | 2014-08-07 14:58:08 -0700 |
|---|---|---|
| committer | chrome-internal-fetch <chrome-internal-fetch@google.com> | 2014-08-08 03:11:38 +0000 |
| commit | 0af39b3cffe139e18267422e985bdf9aca19dcbe (patch) | |
| tree | f52f7150c9bc7393e03230c26a1b994c640c8861 /chip/stm32/crc_hw.h | |
| parent | 5d208b992494ae4cdeffc0efdf4f341c6ada64e5 (diff) | |
| download | chrome-ec-0af39b3cffe139e18267422e985bdf9aca19dcbe.tar.gz | |
Move software CRC implementation to common
There is nothing chip-specific in the software CRC implementation. Let's
move it to common so that we can reuse it for other chips and unit
tests.
BUG=chrome-os-partner:31200
TEST=Define CONFIG_SW_CRC for host. Check crc.c compiles fine.
BRANCH=None
Change-Id: Icdc1d105c55c38ff07410cb5d733a31dbac53aea
Signed-off-by: Vic Yang <victoryang@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/211494
Reviewed-by: Vincent Palatin <vpalatin@chromium.org>
Diffstat (limited to 'chip/stm32/crc_hw.h')
| -rw-r--r-- | chip/stm32/crc_hw.h | 38 |
1 files changed, 38 insertions, 0 deletions
diff --git a/chip/stm32/crc_hw.h b/chip/stm32/crc_hw.h new file mode 100644 index 0000000000..c1a97da842 --- /dev/null +++ b/chip/stm32/crc_hw.h @@ -0,0 +1,38 @@ +/* Copyright (c) 2014 The Chromium OS Authors. All rights reserved. + * Use of this source code is governed by a BSD-style license that can be + * found in the LICENSE file. + */ + +#ifndef _CRC_HW_H +#define _CRC_HW_H +/* CRC-32 hardware implementation with USB constants */ + +#include "registers.h" + +static inline void crc32_init(void) +{ + /* switch on CRC controller */ + STM32_RCC_AHBENR |= 1 << 6; /* switch on CRC controller */ + /* reset CRC state */ + STM32_CRC_CR = STM32_CRC_CR_RESET | STM32_CRC_CR_REV_OUT + | STM32_CRC_CR_REV_IN_WORD; + while (STM32_CRC_CR & 1) + ; +} + +static inline void crc32_hash32(uint32_t val) +{ + STM32_CRC_DR = val; +} + +static inline void crc32_hash16(uint16_t val) +{ + STM32_CRC_DR16 = val; +} + +static inline uint32_t crc32_result(void) +{ + return STM32_CRC_DR ^ 0xFFFFFFFF; +} + +#endif /* _CRC_HW_H */ |