Eric Lee / smarc-uboot | Embedian Git Server

Commit ed6ce67a2c7071cf5032848caa8bbf037e5ac51b

Authored by Thomas Chou 2011-01-11 09:38:20 +0800

Committed by Wolfgang Denk 2011-01-19 06:38:08 +0800

Exists in master and in 54 other branches

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>

Showing 3 changed files with 77 additions and 0 deletions Inline Diff

include/linux/crc7.h
lib/Makefile
lib/crc7.c

include/linux/crc7.h

Diff comments View file @ ed6ce67

File was created	1	#ifndef _LINUX_CRC7_H
	2	#define _LINUX_CRC7_H
	3	#include <linux/types.h>
	4
	5	extern const u8 crc7_syndrome_table[256];
	6
	7	static inline u8 crc7_byte(u8 crc, u8 data)
	8	{
	9	return crc7_syndrome_table[(crc << 1) ^ data];
	10	}
	11
	12	extern u8 crc7(u8 crc, const u8 *buffer, size_t len);
	13
	14	#endif
	15

lib/Makefile

Diff comments View file @ ed6ce67

 #
 # (C) Copyright 2000-2006
 # Wolfgang Denk, DENX Software Engineering, wd@denx.de.
 #
 # See file CREDITS for list of people who contributed to this
 # project.
 #
 # This program is free software; you can redistribute it and/or
 # modify it under the terms of the GNU General Public License as
 # published by the Free Software Foundation; either version 2 of
 # the License, or (at your option) any later version.
 #
 # This program is distributed in the hope that it will be useful,
 # but WITHOUT ANY WARRANTY; without even the implied warranty of
 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 # GNU General Public License for more details.
 #
 # You should have received a copy of the GNU General Public License
 # along with this program; if not, write to the Free Software
 # Foundation, Inc., 59 Temple Place, Suite 330, Boston,
 # MA 02111-1307 USA
 #
 include $(TOPDIR)/config.mk
 LIB	= $(obj)libgeneric.o
 COBJS-$(CONFIG_ADDR_MAP) += addr_map.o
 COBJS-$(CONFIG_BZIP2) += bzlib.o
 COBJS-$(CONFIG_BZIP2) += bzlib_crctable.o
 COBJS-$(CONFIG_BZIP2) += bzlib_decompress.o
 COBJS-$(CONFIG_BZIP2) += bzlib_randtable.o
 COBJS-$(CONFIG_BZIP2) += bzlib_huffman.o
 COBJS-$(CONFIG_USB_TTY) += circbuf.o
+COBJS-y += crc7.o
 COBJS-y += crc16.o
 COBJS-y += crc32.o
 COBJS-y += ctype.o
 COBJS-y += display_options.o
 COBJS-y += div64.o
 COBJS-y += errno.o
 COBJS-$(CONFIG_GZIP) += gunzip.o
 COBJS-y += hashtable.o
 COBJS-$(CONFIG_LMB) += lmb.o
 COBJS-y += ldiv.o
 COBJS-$(CONFIG_MD5) += md5.o
 COBJS-y += net_utils.o
 COBJS-y += qsort.o
 COBJS-$(CONFIG_SHA1) += sha1.o
 COBJS-$(CONFIG_SHA256) += sha256.o
 COBJS-y += string.o
 COBJS-y	+= strmhz.o
 COBJS-y += time.o
 COBJS-y += vsprintf.o
 COBJS-$(CONFIG_ZLIB) += zlib.o
 COBJS-$(CONFIG_RBTREE)	+= rbtree.o
 COBJS	:= $(COBJS-y)
 SRCS	:= $(COBJS:.o=.c)
 OBJS	:= $(addprefix $(obj),$(COBJS))
 $(LIB):	$(obj).depend $(OBJS)
 	$(call cmd_link_o_target, $(OBJS))
 #########################################################################
 # defines $(obj).depend target
 include $(SRCTREE)/rules.mk
 sinclude $(obj).depend
 #########################################################################

lib/crc7.c

Diff comments View file @ ed6ce67

File was created	1	/*
	2	* crc7.c
	3	*
	4	* This source code is licensed under the GNU General Public License,
	5	* Version 2. See the file COPYING for more details.
	6	*/
	7
	8	#include <linux/types.h>
	9	#include <linux/crc7.h>
	10
	11
	12	/* Table for CRC-7 (polynomial x^7 + x^3 + 1) */
	13	const u8 crc7_syndrome_table[256] = {
	14	0x00, 0x09, 0x12, 0x1b, 0x24, 0x2d, 0x36, 0x3f,
	15	0x48, 0x41, 0x5a, 0x53, 0x6c, 0x65, 0x7e, 0x77,
	16	0x19, 0x10, 0x0b, 0x02, 0x3d, 0x34, 0x2f, 0x26,
	17	0x51, 0x58, 0x43, 0x4a, 0x75, 0x7c, 0x67, 0x6e,
	18	0x32, 0x3b, 0x20, 0x29, 0x16, 0x1f, 0x04, 0x0d,
	19	0x7a, 0x73, 0x68, 0x61, 0x5e, 0x57, 0x4c, 0x45,
	20	0x2b, 0x22, 0x39, 0x30, 0x0f, 0x06, 0x1d, 0x14,
	21	0x63, 0x6a, 0x71, 0x78, 0x47, 0x4e, 0x55, 0x5c,
	22	0x64, 0x6d, 0x76, 0x7f, 0x40, 0x49, 0x52, 0x5b,
	23	0x2c, 0x25, 0x3e, 0x37, 0x08, 0x01, 0x1a, 0x13,
	24	0x7d, 0x74, 0x6f, 0x66, 0x59, 0x50, 0x4b, 0x42,
	25	0x35, 0x3c, 0x27, 0x2e, 0x11, 0x18, 0x03, 0x0a,
	26	0x56, 0x5f, 0x44, 0x4d, 0x72, 0x7b, 0x60, 0x69,
	27	0x1e, 0x17, 0x0c, 0x05, 0x3a, 0x33, 0x28, 0x21,
	28	0x4f, 0x46, 0x5d, 0x54, 0x6b, 0x62, 0x79, 0x70,
	29	0x07, 0x0e, 0x15, 0x1c, 0x23, 0x2a, 0x31, 0x38,
	30	0x41, 0x48, 0x53, 0x5a, 0x65, 0x6c, 0x77, 0x7e,
	31	0x09, 0x00, 0x1b, 0x12, 0x2d, 0x24, 0x3f, 0x36,
	32	0x58, 0x51, 0x4a, 0x43, 0x7c, 0x75, 0x6e, 0x67,
	33	0x10, 0x19, 0x02, 0x0b, 0x34, 0x3d, 0x26, 0x2f,
	34	0x73, 0x7a, 0x61, 0x68, 0x57, 0x5e, 0x45, 0x4c,
	35	0x3b, 0x32, 0x29, 0x20, 0x1f, 0x16, 0x0d, 0x04,
	36	0x6a, 0x63, 0x78, 0x71, 0x4e, 0x47, 0x5c, 0x55,
	37	0x22, 0x2b, 0x30, 0x39, 0x06, 0x0f, 0x14, 0x1d,
	38	0x25, 0x2c, 0x37, 0x3e, 0x01, 0x08, 0x13, 0x1a,
	39	0x6d, 0x64, 0x7f, 0x76, 0x49, 0x40, 0x5b, 0x52,
	40	0x3c, 0x35, 0x2e, 0x27, 0x18, 0x11, 0x0a, 0x03,
	41	0x74, 0x7d, 0x66, 0x6f, 0x50, 0x59, 0x42, 0x4b,
	42	0x17, 0x1e, 0x05, 0x0c, 0x33, 0x3a, 0x21, 0x28,
	43	0x5f, 0x56, 0x4d, 0x44, 0x7b, 0x72, 0x69, 0x60,
	44	0x0e, 0x07, 0x1c, 0x15, 0x2a, 0x23, 0x38, 0x31,
	45	0x46, 0x4f, 0x54, 0x5d, 0x62, 0x6b, 0x70, 0x79
	46	};
	47
	48	/**
	49	* crc7 - update the CRC7 for the data buffer
	50	* @crc: previous CRC7 value
	51	* @buffer: data pointer
	52	* @len: number of bytes in the buffer
	53	* Context: any
	54	*
	55	* Returns the updated CRC7 value.
	56	*/
	57	u8 crc7(u8 crc, const u8 *buffer, size_t len)
	58	{
	59	while (len--)
	60	crc = crc7_byte(crc, *buffer++);
	61	return crc;
	62	}
	63