diff options
author | Simon Glass <sjg@chromium.org> | 2013-11-10 10:26:47 -0700 |
---|---|---|
committer | Simon Glass <sjg@chromium.org> | 2014-01-08 17:20:34 -0700 |
commit | 60d18d3fe9d1a5db663711063cd0d5c915af377a (patch) | |
tree | 82f1144ddcc272992f4999fac37bda8a816ec991 /lib | |
parent | e7be18225fbea76d1f0034b224f0d1e60f07cfcf (diff) |
Add crc8 routine
Add an implementation of the CRC8 algorithm. This is required by the TPM
emulation, but is probably useful to U-Boot in general.
Signed-off-by: Simon Glass <sjg@chromium.org>
Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Simon Glass <sjg@chromium.org>
Diffstat (limited to 'lib')
-rw-r--r-- | lib/Makefile | 1 | ||||
-rw-r--r-- | lib/crc8.c | 25 |
2 files changed, 26 insertions, 0 deletions
diff --git a/lib/Makefile b/lib/Makefile index e787f77be8..760340fbde 100644 --- a/lib/Makefile +++ b/lib/Makefile @@ -21,6 +21,7 @@ obj-$(CONFIG_BZIP2) += bzlib_randtable.o obj-$(CONFIG_BZIP2) += bzlib_huffman.o obj-$(CONFIG_USB_TTY) += circbuf.o obj-y += crc7.o +obj-y += crc8.o obj-y += crc16.o obj-$(CONFIG_OF_CONTROL) += fdtdec.o obj-$(CONFIG_TEST_FDTDEC) += fdtdec_test.o diff --git a/lib/crc8.c b/lib/crc8.c new file mode 100644 index 0000000000..8b68a29e40 --- /dev/null +++ b/lib/crc8.c @@ -0,0 +1,25 @@ +/* + * Copyright (c) 2013 Google, Inc + * + * SPDX-License-Identifier: GPL-2.0+ + */ + +#include "linux/crc8.h" + +unsigned int crc8(const unsigned char *vptr, int len) +{ + const unsigned char *data = vptr; + unsigned int crc = 0; + int i, j; + + for (j = len; j; j--, data++) { + crc ^= (*data << 8); + for (i = 8; i; i--) { + if (crc & 0x8000) + crc ^= (0x1070 << 3); + crc <<= 1; + } + } + + return (crc >> 8) & 0xff; +} |