From patchwork Tue Jan 11 01:38:20 2011 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Thomas Chou X-Patchwork-Id: 78267 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Received: from theia.denx.de (theia.denx.de [85.214.87.163]) by ozlabs.org (Postfix) with ESMTP id 01743B6F2B for ; Tue, 11 Jan 2011 12:37:11 +1100 (EST) Received: from localhost (localhost [127.0.0.1]) by theia.denx.de (Postfix) with ESMTP id 777182812B; Tue, 11 Jan 2011 02:37:08 +0100 (CET) X-Virus-Scanned: Debian amavisd-new at theia.denx.de Received: from theia.denx.de ([127.0.0.1]) by localhost (theia.denx.de [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id mgXoHtUiddA8; Tue, 11 Jan 2011 02:37:08 +0100 (CET) Received: from theia.denx.de (localhost [127.0.0.1]) by theia.denx.de (Postfix) with ESMTP id 4148028112; Tue, 11 Jan 2011 02:37:04 +0100 (CET) Received: from localhost (localhost [127.0.0.1]) by theia.denx.de (Postfix) with ESMTP id 7D87C28112 for ; Tue, 11 Jan 2011 02:37:01 +0100 (CET) X-Virus-Scanned: Debian amavisd-new at theia.denx.de Received: from theia.denx.de ([127.0.0.1]) by localhost (theia.denx.de [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id voP-kfu8o8Nf for ; Tue, 11 Jan 2011 02:36:58 +0100 (CET) X-policyd-weight: NOT_IN_SBL_XBL_SPAMHAUS=-1.5 NOT_IN_SPAMCOP=-1.5 NOT_IN_BL_NJABL=-1.5 (only DNSBL check requested) Received: from www.wytron.com.tw (www.wytron.com.tw [211.75.82.101]) by theia.denx.de (Postfix) with ESMTPS id 12E292810B for ; Tue, 11 Jan 2011 02:36:55 +0100 (CET) Received: from [192.168.1.15] (helo=darkstar.wytron.com.tw) by www.wytron.com.tw with esmtp (Exim 4.69) (envelope-from ) id 1PcTAF-000453-4P; Tue, 11 Jan 2011 09:36:47 +0800 From: Thomas Chou To: Andy Fleming Date: Tue, 11 Jan 2011 09:38:20 +0800 Message-Id: <1294709900-2764-1-git-send-email-thomas@wytron.com.tw> X-Mailer: git-send-email 1.7.3.4 In-Reply-To: <20110110205921.7BE82150A49@gemini.denx.de> References: <20110110205921.7BE82150A49@gemini.denx.de> X-SA-Exim-Connect-IP: 192.168.1.15 X-SA-Exim-Mail-From: thomas@wytron.com.tw X-SA-Exim-Scanned: No (on www.wytron.com.tw); SAEximRunCond expanded to false Cc: u-boot@lists.denx.de, nios2-dev@sopc.et.ntust.edu.tw Subject: [U-Boot] [PATCH v2] lib: add crc7 from Linux X-BeenThere: u-boot@lists.denx.de X-Mailman-Version: 2.1.9 Precedence: list List-Id: U-Boot discussion List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , MIME-Version: 1.0 Sender: u-boot-bounces@lists.denx.de Errors-To: u-boot-bounces@lists.denx.de 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 --- v2 update attribution as Wolfgang suggested. include/linux/crc7.h | 14 +++++++++++ lib/Makefile | 1 + lib/crc7.c | 62 ++++++++++++++++++++++++++++++++++++++++++++++++++ 3 files changed, 77 insertions(+), 0 deletions(-) create mode 100644 include/linux/crc7.h create mode 100644 lib/crc7.c 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 + +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 diff --git a/lib/Makefile b/lib/Makefile index ffdee7d..fcfe351 100644 --- a/lib/Makefile +++ b/lib/Makefile @@ -32,6 +32,7 @@ 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 diff --git a/lib/crc7.c b/lib/crc7.c new file mode 100644 index 0000000..e635c9c --- /dev/null +++ b/lib/crc7.c @@ -0,0 +1,62 @@ +/* + * crc7.c + * + * This source code is licensed under the GNU General Public License, + * Version 2. See the file COPYING for more details. + */ + +#include +#include + + +/* Table for CRC-7 (polynomial x^7 + x^3 + 1) */ +const u8 crc7_syndrome_table[256] = { + 0x00, 0x09, 0x12, 0x1b, 0x24, 0x2d, 0x36, 0x3f, + 0x48, 0x41, 0x5a, 0x53, 0x6c, 0x65, 0x7e, 0x77, + 0x19, 0x10, 0x0b, 0x02, 0x3d, 0x34, 0x2f, 0x26, + 0x51, 0x58, 0x43, 0x4a, 0x75, 0x7c, 0x67, 0x6e, + 0x32, 0x3b, 0x20, 0x29, 0x16, 0x1f, 0x04, 0x0d, + 0x7a, 0x73, 0x68, 0x61, 0x5e, 0x57, 0x4c, 0x45, + 0x2b, 0x22, 0x39, 0x30, 0x0f, 0x06, 0x1d, 0x14, + 0x63, 0x6a, 0x71, 0x78, 0x47, 0x4e, 0x55, 0x5c, + 0x64, 0x6d, 0x76, 0x7f, 0x40, 0x49, 0x52, 0x5b, + 0x2c, 0x25, 0x3e, 0x37, 0x08, 0x01, 0x1a, 0x13, + 0x7d, 0x74, 0x6f, 0x66, 0x59, 0x50, 0x4b, 0x42, + 0x35, 0x3c, 0x27, 0x2e, 0x11, 0x18, 0x03, 0x0a, + 0x56, 0x5f, 0x44, 0x4d, 0x72, 0x7b, 0x60, 0x69, + 0x1e, 0x17, 0x0c, 0x05, 0x3a, 0x33, 0x28, 0x21, + 0x4f, 0x46, 0x5d, 0x54, 0x6b, 0x62, 0x79, 0x70, + 0x07, 0x0e, 0x15, 0x1c, 0x23, 0x2a, 0x31, 0x38, + 0x41, 0x48, 0x53, 0x5a, 0x65, 0x6c, 0x77, 0x7e, + 0x09, 0x00, 0x1b, 0x12, 0x2d, 0x24, 0x3f, 0x36, + 0x58, 0x51, 0x4a, 0x43, 0x7c, 0x75, 0x6e, 0x67, + 0x10, 0x19, 0x02, 0x0b, 0x34, 0x3d, 0x26, 0x2f, + 0x73, 0x7a, 0x61, 0x68, 0x57, 0x5e, 0x45, 0x4c, + 0x3b, 0x32, 0x29, 0x20, 0x1f, 0x16, 0x0d, 0x04, + 0x6a, 0x63, 0x78, 0x71, 0x4e, 0x47, 0x5c, 0x55, + 0x22, 0x2b, 0x30, 0x39, 0x06, 0x0f, 0x14, 0x1d, + 0x25, 0x2c, 0x37, 0x3e, 0x01, 0x08, 0x13, 0x1a, + 0x6d, 0x64, 0x7f, 0x76, 0x49, 0x40, 0x5b, 0x52, + 0x3c, 0x35, 0x2e, 0x27, 0x18, 0x11, 0x0a, 0x03, + 0x74, 0x7d, 0x66, 0x6f, 0x50, 0x59, 0x42, 0x4b, + 0x17, 0x1e, 0x05, 0x0c, 0x33, 0x3a, 0x21, 0x28, + 0x5f, 0x56, 0x4d, 0x44, 0x7b, 0x72, 0x69, 0x60, + 0x0e, 0x07, 0x1c, 0x15, 0x2a, 0x23, 0x38, 0x31, + 0x46, 0x4f, 0x54, 0x5d, 0x62, 0x6b, 0x70, 0x79 +}; + +/** + * crc7 - update the CRC7 for the data buffer + * @crc: previous CRC7 value + * @buffer: data pointer + * @len: number of bytes in the buffer + * Context: any + * + * Returns the updated CRC7 value. + */ +u8 crc7(u8 crc, const u8 *buffer, size_t len) +{ + while (len--) + crc = crc7_byte(crc, *buffer++); + return crc; +}