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Thu, 25 Sep 2025 13:59:25 +0200 From: David Picard Date: Thu, 25 Sep 2025 13:59:15 +0200 MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Message-Id: <20250925-boards-enclustra-sa2-add-support-v2-8-6820ad6c6256@clermont.in2p3.fr> References: <20250925-boards-enclustra-sa2-add-support-v2-0-6820ad6c6256@clermont.in2p3.fr> In-Reply-To: <20250925-boards-enclustra-sa2-add-support-v2-0-6820ad6c6256@clermont.in2p3.fr> To: Sascha Hauer , BAREBOX Cc: David Picard X-Mailer: b4 0.14.2 X-Developer-Signature: v=1; a=ed25519-sha256; t=1758801565; l=5111; i=david.picard@clermont.in2p3.fr; s=20250917; h=from:subject:message-id; bh=794bCC9JR6DY/LVkFSSq9Af7SXS9JhqSrxBV0gJoqds=; b=sgbK0kKls6vcyOuJOQsAdIqNIQl3MtQvLEhXojBNIVH5HFFarO0/+jahQhrt+xoiC7GSAJ82a 62SIxUi4SpHCNfdwC3DSTPJIGhd/0L2ceNC6+QdK0VyRajaBS7yO85s X-Developer-Key: i=david.picard@clermont.in2p3.fr; a=ed25519; pk=Ew2hyxWdBXm7qaK2tHrk3KcOlOjoh3+irqJPSHtq/PU= X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20250925_045931_320822_865246FC X-CRM114-Status: GOOD ( 12.99 ) X-BeenThere: barebox@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "barebox" X-SA-Exim-Connect-IP: 2607:7c80:54:3::133 X-SA-Exim-Mail-From: barebox-bounces+lore=pengutronix.de@lists.infradead.org X-Spam-Checker-Version: SpamAssassin 3.4.2 (2018-09-13) on metis.whiteo.stw.pengutronix.de X-Spam-Level: X-Spam-Status: No, score=-4.1 required=4.0 tests=AWL,BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,RCVD_IN_DNSWL_LOW,SPF_HELO_NONE,SPF_NONE autolearn=unavailable autolearn_force=no version=3.4.2 Subject: [PATCH v2 08/10] lib: add crc16 support X-SA-Exim-Version: 4.2.1 (built Wed, 08 May 2019 21:11:16 +0000) X-SA-Exim-Scanned: Yes (on metis.whiteo.stw.pengutronix.de) From: Sascha Hauer This adds crc16 support taken straight out of Linux-6.16 Signed-off-by: Sascha Hauer --- include/linux/crc16.h | 21 ++++++++++++++++ lib/Kconfig | 3 +++ lib/Makefile | 1 + lib/crc16.c | 69 +++++++++++++++++++++++++++++++++++++++++++++++++++ 4 files changed, 94 insertions(+) diff --git a/include/linux/crc16.h b/include/linux/crc16.h new file mode 100644 index 0000000000000000000000000000000000000000..2b53d62d81f0d5db9b98dd29bf2625bb34e2bb4e --- /dev/null +++ b/include/linux/crc16.h @@ -0,0 +1,21 @@ +/* SPDX-License-Identifier: GPL-2.0-only */ +/* + * crc16.h - CRC-16 routine + * + * Implements the standard CRC-16: + * Width 16 + * Poly 0x8005 (x^16 + x^15 + x^2 + 1) + * Init 0 + * + * Copyright (c) 2005 Ben Gardner + */ + +#ifndef __CRC16_H +#define __CRC16_H + +#include + +u16 crc16(u16 crc, const u8 *buffer, size_t len); + +#endif /* __CRC16_H */ + diff --git a/lib/Kconfig b/lib/Kconfig index d07e2f3b695916df56775bc8c1a98bad8bd52b52..c83589e2d9e442caa2351bfb400d197296819c16 100644 --- a/lib/Kconfig +++ b/lib/Kconfig @@ -162,6 +162,9 @@ config CRC8 when they need to do cyclic redundancy check according CRC8 algorithm. Module will be called crc8. +config CRC16 + bool "CRC16 function" + source "lib/gui/Kconfig" source "lib/fonts/Kconfig" diff --git a/lib/Makefile b/lib/Makefile index 13f1de1420083df3e8c846b503968f58474e36f0..e9f152b21dad3f521cb9dbbf88d6012fdee19c3c 100644 --- a/lib/Makefile +++ b/lib/Makefile @@ -85,6 +85,7 @@ obj-y += parseopt.o obj-y += clz_ctz.o obj-$(CONFIG_CRC_CCITT) += crc-ccitt.o obj-$(CONFIG_CRC8) += crc8.o +obj-$(CONFIG_CRC16) += crc16.o obj-$(CONFIG_NLS) += nls_base.o obj-$(CONFIG_FSL_QE_FIRMWARE) += fsl-qe-firmware.o obj-$(CONFIG_UBSAN_STANDALONE) += ubsan.o diff --git a/lib/crc16.c b/lib/crc16.c new file mode 100644 index 0000000000000000000000000000000000000000..8d0354ba6b7a6a02367cf42e7bec30d64ce57e0b --- /dev/null +++ b/lib/crc16.c @@ -0,0 +1,69 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * crc16.c + */ + +#include +#include +#include + +/** CRC table for the CRC-16. The poly is 0x8005 (x^16 + x^15 + x^2 + 1) */ +static u16 const crc16_table[256] = { + 0x0000, 0xC0C1, 0xC181, 0x0140, 0xC301, 0x03C0, 0x0280, 0xC241, + 0xC601, 0x06C0, 0x0780, 0xC741, 0x0500, 0xC5C1, 0xC481, 0x0440, + 0xCC01, 0x0CC0, 0x0D80, 0xCD41, 0x0F00, 0xCFC1, 0xCE81, 0x0E40, + 0x0A00, 0xCAC1, 0xCB81, 0x0B40, 0xC901, 0x09C0, 0x0880, 0xC841, + 0xD801, 0x18C0, 0x1980, 0xD941, 0x1B00, 0xDBC1, 0xDA81, 0x1A40, + 0x1E00, 0xDEC1, 0xDF81, 0x1F40, 0xDD01, 0x1DC0, 0x1C80, 0xDC41, + 0x1400, 0xD4C1, 0xD581, 0x1540, 0xD701, 0x17C0, 0x1680, 0xD641, + 0xD201, 0x12C0, 0x1380, 0xD341, 0x1100, 0xD1C1, 0xD081, 0x1040, + 0xF001, 0x30C0, 0x3180, 0xF141, 0x3300, 0xF3C1, 0xF281, 0x3240, + 0x3600, 0xF6C1, 0xF781, 0x3740, 0xF501, 0x35C0, 0x3480, 0xF441, + 0x3C00, 0xFCC1, 0xFD81, 0x3D40, 0xFF01, 0x3FC0, 0x3E80, 0xFE41, + 0xFA01, 0x3AC0, 0x3B80, 0xFB41, 0x3900, 0xF9C1, 0xF881, 0x3840, + 0x2800, 0xE8C1, 0xE981, 0x2940, 0xEB01, 0x2BC0, 0x2A80, 0xEA41, + 0xEE01, 0x2EC0, 0x2F80, 0xEF41, 0x2D00, 0xEDC1, 0xEC81, 0x2C40, + 0xE401, 0x24C0, 0x2580, 0xE541, 0x2700, 0xE7C1, 0xE681, 0x2640, + 0x2200, 0xE2C1, 0xE381, 0x2340, 0xE101, 0x21C0, 0x2080, 0xE041, + 0xA001, 0x60C0, 0x6180, 0xA141, 0x6300, 0xA3C1, 0xA281, 0x6240, + 0x6600, 0xA6C1, 0xA781, 0x6740, 0xA501, 0x65C0, 0x6480, 0xA441, + 0x6C00, 0xACC1, 0xAD81, 0x6D40, 0xAF01, 0x6FC0, 0x6E80, 0xAE41, + 0xAA01, 0x6AC0, 0x6B80, 0xAB41, 0x6900, 0xA9C1, 0xA881, 0x6840, + 0x7800, 0xB8C1, 0xB981, 0x7940, 0xBB01, 0x7BC0, 0x7A80, 0xBA41, + 0xBE01, 0x7EC0, 0x7F80, 0xBF41, 0x7D00, 0xBDC1, 0xBC81, 0x7C40, + 0xB401, 0x74C0, 0x7580, 0xB541, 0x7700, 0xB7C1, 0xB681, 0x7640, + 0x7200, 0xB2C1, 0xB381, 0x7340, 0xB101, 0x71C0, 0x7080, 0xB041, + 0x5000, 0x90C1, 0x9181, 0x5140, 0x9301, 0x53C0, 0x5280, 0x9241, + 0x9601, 0x56C0, 0x5780, 0x9741, 0x5500, 0x95C1, 0x9481, 0x5440, + 0x9C01, 0x5CC0, 0x5D80, 0x9D41, 0x5F00, 0x9FC1, 0x9E81, 0x5E40, + 0x5A00, 0x9AC1, 0x9B81, 0x5B40, 0x9901, 0x59C0, 0x5880, 0x9841, + 0x8801, 0x48C0, 0x4980, 0x8941, 0x4B00, 0x8BC1, 0x8A81, 0x4A40, + 0x4E00, 0x8EC1, 0x8F81, 0x4F40, 0x8D01, 0x4DC0, 0x4C80, 0x8C41, + 0x4400, 0x84C1, 0x8581, 0x4540, 0x8701, 0x47C0, 0x4680, 0x8641, + 0x8201, 0x42C0, 0x4380, 0x8341, 0x4100, 0x81C1, 0x8081, 0x4040 +}; + +static inline u16 crc16_byte(u16 crc, const u8 data) +{ + return (crc >> 8) ^ crc16_table[(crc ^ data) & 0xff]; +} + +/** + * crc16 - compute the CRC-16 for the data buffer + * @crc: previous CRC value + * @buffer: data pointer + * @len: number of bytes in the buffer + * + * Returns the updated CRC value. + */ +u16 crc16(u16 crc, u8 const *buffer, size_t len) +{ + while (len--) + crc = crc16_byte(crc, *buffer++); + return crc; +} +EXPORT_SYMBOL(crc16); + +MODULE_DESCRIPTION("CRC16 calculations"); +MODULE_LICENSE("GPL"); + -- 2.43.0