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| author | Thomas Chou <thomas@wytron.com.tw> | 2011-01-11 09:38:20 +0800 |
|---|---|---|
| committer | Wolfgang Denk <wd@denx.de> | 2011-01-18 23:38:08 +0100 |
| commit | ed6ce67a2c7071cf5032848caa8bbf037e5ac51b (patch) | |
| tree | 4af693e4e589c5d6c8043fa97439e116da828b90 /include/linux/crc7.h | |
| parent | 5c4fa2eea0d68764766b5996baa5508f64f1f64b (diff) | |
| download | u-boot-imx-ed6ce67a2c7071cf5032848caa8bbf037e5ac51b.zip u-boot-imx-ed6ce67a2c7071cf5032848caa8bbf037e5ac51b.tar.gz u-boot-imx-ed6ce67a2c7071cf5032848caa8bbf037e5ac51b.tar.bz2 | |
lib: add crc7 from Linux
Crc7 is used to compute mmc spi command packet checksum.
Copy from linux-2.6 lib/crc7.c include/linux/crc7.h
commit ad241528c4919505afccb022acbab3eeb0db4d80
Signed-off-by: Thomas Chou <thomas@wytron.com.tw>
Diffstat (limited to 'include/linux/crc7.h')
| -rw-r--r-- | include/linux/crc7.h | 14 |
1 files changed, 14 insertions, 0 deletions
diff --git a/include/linux/crc7.h b/include/linux/crc7.h new file mode 100644 index 0000000..1786e77 --- /dev/null +++ b/include/linux/crc7.h @@ -0,0 +1,14 @@ +#ifndef _LINUX_CRC7_H +#define _LINUX_CRC7_H +#include <linux/types.h> + +extern const u8 crc7_syndrome_table[256]; + +static inline u8 crc7_byte(u8 crc, u8 data) +{ + return crc7_syndrome_table[(crc << 1) ^ data]; +} + +extern u8 crc7(u8 crc, const u8 *buffer, size_t len); + +#endif |