From patchwork Sun Apr 7 16:41:03 2013 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Mike Dunn X-Patchwork-Id: 234523 X-Patchwork-Delegate: albert.aribaud@free.fr 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 AC70B2C00A1 for ; Mon, 8 Apr 2013 05:07:18 +1000 (EST) Received: from localhost (localhost [127.0.0.1]) by theia.denx.de (Postfix) with ESMTP id 3418F4A224; Sun, 7 Apr 2013 21:06:34 +0200 (CEST) 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 GgqaCyCmptdE; Sun, 7 Apr 2013 21:06:33 +0200 (CEST) Received: from theia.denx.de (localhost [127.0.0.1]) by theia.denx.de (Postfix) with ESMTP id 0159B4A247; Sun, 7 Apr 2013 21:06:01 +0200 (CEST) Received: from localhost (localhost [127.0.0.1]) by theia.denx.de (Postfix) with ESMTP id BD77E4A228 for ; Sun, 7 Apr 2013 18:54:26 +0200 (CEST) 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 bXR+aUAsl4hH for ; Sun, 7 Apr 2013 18:54:24 +0200 (CEST) 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 smtp.newsguy.com (smtp.newsguy.com [74.209.136.69]) by theia.denx.de (Postfix) with ESMTPS id 3D3F74A24B for ; Sun, 7 Apr 2013 18:54:21 +0200 (CEST) Received: from localhost.localdomain (87.sub-70-199-131.myvzw.com [70.199.131.87]) by smtp.newsguy.com (8.14.3/8.14.3) with ESMTP id r37GewUj070841 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=NO); Sun, 7 Apr 2013 09:42:07 -0700 (PDT) (envelope-from mikedunn@newsguy.com) From: Mike Dunn To: u-boot@lists.denx.de Date: Sun, 7 Apr 2013 09:41:03 -0700 Message-Id: <1365352865-2137-7-git-send-email-mikedunn@newsguy.com> X-Mailer: git-send-email 1.7.8.6 In-Reply-To: <1365352865-2137-1-git-send-email-mikedunn@newsguy.com> References: <1365352865-2137-1-git-send-email-mikedunn@newsguy.com> X-Mailman-Approved-At: Sun, 07 Apr 2013 21:05:49 +0200 Cc: Marek Vasut , Tom Rini , Tomas Cech , Haojian Zhuang Subject: [U-Boot] [PATCH 6/8] lib: import bitrev library from linux kernel X-BeenThere: u-boot@lists.denx.de X-Mailman-Version: 2.1.11 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 This patch adds the bitrev library from the linux kernel. This is a simple algorithm that uses an 8 bit look-up table to reverse the bits in data types of 8, 16, or 32 bit widths. The docg4 nand flash driver uses it. Signed-off-by: Mike Dunn --- include/linux/bitrev.h | 16 +++++++++++++ lib/Makefile | 1 + lib/bitrev.c | 56 ++++++++++++++++++++++++++++++++++++++++++++++++ 3 files changed, 73 insertions(+), 0 deletions(-) create mode 100644 include/linux/bitrev.h create mode 100644 lib/bitrev.c diff --git a/include/linux/bitrev.h b/include/linux/bitrev.h new file mode 100644 index 0000000..7ffe03f --- /dev/null +++ b/include/linux/bitrev.h @@ -0,0 +1,16 @@ +#ifndef _LINUX_BITREV_H +#define _LINUX_BITREV_H + +#include + +extern u8 const byte_rev_table[256]; + +static inline u8 bitrev8(u8 byte) +{ + return byte_rev_table[byte]; +} + +extern u16 bitrev16(u16 in); +extern u32 bitrev32(u32 in); + +#endif /* _LINUX_BITREV_H */ diff --git a/lib/Makefile b/lib/Makefile index 1bfd3ee..b4aaae9 100644 --- a/lib/Makefile +++ b/lib/Makefile @@ -55,6 +55,7 @@ COBJS-$(CONFIG_SHA1) += sha1.o COBJS-$(CONFIG_SHA256) += sha256.o COBJS-y += strmhz.o COBJS-$(CONFIG_RBTREE) += rbtree.o +COBJS-$(CONFIG_BITREVERSE) += bitrev.o endif ifdef CONFIG_SPL_BUILD diff --git a/lib/bitrev.c b/lib/bitrev.c new file mode 100644 index 0000000..3448e3f --- /dev/null +++ b/lib/bitrev.c @@ -0,0 +1,56 @@ +/* + * Based on bitrev from the Linux kernel, by Akinobu Mita + */ + + +#include +#include + +const u8 byte_rev_table[256] = { + 0x00, 0x80, 0x40, 0xc0, 0x20, 0xa0, 0x60, 0xe0, + 0x10, 0x90, 0x50, 0xd0, 0x30, 0xb0, 0x70, 0xf0, + 0x08, 0x88, 0x48, 0xc8, 0x28, 0xa8, 0x68, 0xe8, + 0x18, 0x98, 0x58, 0xd8, 0x38, 0xb8, 0x78, 0xf8, + 0x04, 0x84, 0x44, 0xc4, 0x24, 0xa4, 0x64, 0xe4, + 0x14, 0x94, 0x54, 0xd4, 0x34, 0xb4, 0x74, 0xf4, + 0x0c, 0x8c, 0x4c, 0xcc, 0x2c, 0xac, 0x6c, 0xec, + 0x1c, 0x9c, 0x5c, 0xdc, 0x3c, 0xbc, 0x7c, 0xfc, + 0x02, 0x82, 0x42, 0xc2, 0x22, 0xa2, 0x62, 0xe2, + 0x12, 0x92, 0x52, 0xd2, 0x32, 0xb2, 0x72, 0xf2, + 0x0a, 0x8a, 0x4a, 0xca, 0x2a, 0xaa, 0x6a, 0xea, + 0x1a, 0x9a, 0x5a, 0xda, 0x3a, 0xba, 0x7a, 0xfa, + 0x06, 0x86, 0x46, 0xc6, 0x26, 0xa6, 0x66, 0xe6, + 0x16, 0x96, 0x56, 0xd6, 0x36, 0xb6, 0x76, 0xf6, + 0x0e, 0x8e, 0x4e, 0xce, 0x2e, 0xae, 0x6e, 0xee, + 0x1e, 0x9e, 0x5e, 0xde, 0x3e, 0xbe, 0x7e, 0xfe, + 0x01, 0x81, 0x41, 0xc1, 0x21, 0xa1, 0x61, 0xe1, + 0x11, 0x91, 0x51, 0xd1, 0x31, 0xb1, 0x71, 0xf1, + 0x09, 0x89, 0x49, 0xc9, 0x29, 0xa9, 0x69, 0xe9, + 0x19, 0x99, 0x59, 0xd9, 0x39, 0xb9, 0x79, 0xf9, + 0x05, 0x85, 0x45, 0xc5, 0x25, 0xa5, 0x65, 0xe5, + 0x15, 0x95, 0x55, 0xd5, 0x35, 0xb5, 0x75, 0xf5, + 0x0d, 0x8d, 0x4d, 0xcd, 0x2d, 0xad, 0x6d, 0xed, + 0x1d, 0x9d, 0x5d, 0xdd, 0x3d, 0xbd, 0x7d, 0xfd, + 0x03, 0x83, 0x43, 0xc3, 0x23, 0xa3, 0x63, 0xe3, + 0x13, 0x93, 0x53, 0xd3, 0x33, 0xb3, 0x73, 0xf3, + 0x0b, 0x8b, 0x4b, 0xcb, 0x2b, 0xab, 0x6b, 0xeb, + 0x1b, 0x9b, 0x5b, 0xdb, 0x3b, 0xbb, 0x7b, 0xfb, + 0x07, 0x87, 0x47, 0xc7, 0x27, 0xa7, 0x67, 0xe7, + 0x17, 0x97, 0x57, 0xd7, 0x37, 0xb7, 0x77, 0xf7, + 0x0f, 0x8f, 0x4f, 0xcf, 0x2f, 0xaf, 0x6f, 0xef, + 0x1f, 0x9f, 0x5f, 0xdf, 0x3f, 0xbf, 0x7f, 0xff, +}; + +u16 bitrev16(u16 x) +{ + return (bitrev8(x & 0xff) << 8) | bitrev8(x >> 8); +} + +/** + * bitrev32 - reverse the order of bits in a u32 value + * @x: value to be bit-reversed + */ +u32 bitrev32(u32 x) +{ + return (bitrev16(x & 0xffff) << 16) | bitrev16(x >> 16); +}