VisionFive2 Linux kernel

StarFive Tech Linux Kernel for VisionFive (JH7110) boards (mirror)

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40b0b3f8fb2d8 (Thomas Gleixner  2019-06-03 07:44:46 +0200  1) // SPDX-License-Identifier: GPL-2.0-only
7657ec1fcb69e (Evgeniy Polyakov 2005-08-17 15:17:26 +0400  2) /*
7657ec1fcb69e (Evgeniy Polyakov 2005-08-17 15:17:26 +0400  3)  *      crc16.c
7657ec1fcb69e (Evgeniy Polyakov 2005-08-17 15:17:26 +0400  4)  */
7657ec1fcb69e (Evgeniy Polyakov 2005-08-17 15:17:26 +0400  5) 
7657ec1fcb69e (Evgeniy Polyakov 2005-08-17 15:17:26 +0400  6) #include <linux/types.h>
7657ec1fcb69e (Evgeniy Polyakov 2005-08-17 15:17:26 +0400  7) #include <linux/module.h>
7657ec1fcb69e (Evgeniy Polyakov 2005-08-17 15:17:26 +0400  8) #include <linux/crc16.h>
7657ec1fcb69e (Evgeniy Polyakov 2005-08-17 15:17:26 +0400  9) 
7657ec1fcb69e (Evgeniy Polyakov 2005-08-17 15:17:26 +0400 10) /** CRC table for the CRC-16. The poly is 0x8005 (x^16 + x^15 + x^2 + 1) */
7657ec1fcb69e (Evgeniy Polyakov 2005-08-17 15:17:26 +0400 11) u16 const crc16_table[256] = {
7657ec1fcb69e (Evgeniy Polyakov 2005-08-17 15:17:26 +0400 12) 	0x0000, 0xC0C1, 0xC181, 0x0140, 0xC301, 0x03C0, 0x0280, 0xC241,
7657ec1fcb69e (Evgeniy Polyakov 2005-08-17 15:17:26 +0400 13) 	0xC601, 0x06C0, 0x0780, 0xC741, 0x0500, 0xC5C1, 0xC481, 0x0440,
7657ec1fcb69e (Evgeniy Polyakov 2005-08-17 15:17:26 +0400 14) 	0xCC01, 0x0CC0, 0x0D80, 0xCD41, 0x0F00, 0xCFC1, 0xCE81, 0x0E40,
7657ec1fcb69e (Evgeniy Polyakov 2005-08-17 15:17:26 +0400 15) 	0x0A00, 0xCAC1, 0xCB81, 0x0B40, 0xC901, 0x09C0, 0x0880, 0xC841,
7657ec1fcb69e (Evgeniy Polyakov 2005-08-17 15:17:26 +0400 16) 	0xD801, 0x18C0, 0x1980, 0xD941, 0x1B00, 0xDBC1, 0xDA81, 0x1A40,
7657ec1fcb69e (Evgeniy Polyakov 2005-08-17 15:17:26 +0400 17) 	0x1E00, 0xDEC1, 0xDF81, 0x1F40, 0xDD01, 0x1DC0, 0x1C80, 0xDC41,
7657ec1fcb69e (Evgeniy Polyakov 2005-08-17 15:17:26 +0400 18) 	0x1400, 0xD4C1, 0xD581, 0x1540, 0xD701, 0x17C0, 0x1680, 0xD641,
7657ec1fcb69e (Evgeniy Polyakov 2005-08-17 15:17:26 +0400 19) 	0xD201, 0x12C0, 0x1380, 0xD341, 0x1100, 0xD1C1, 0xD081, 0x1040,
7657ec1fcb69e (Evgeniy Polyakov 2005-08-17 15:17:26 +0400 20) 	0xF001, 0x30C0, 0x3180, 0xF141, 0x3300, 0xF3C1, 0xF281, 0x3240,
7657ec1fcb69e (Evgeniy Polyakov 2005-08-17 15:17:26 +0400 21) 	0x3600, 0xF6C1, 0xF781, 0x3740, 0xF501, 0x35C0, 0x3480, 0xF441,
7657ec1fcb69e (Evgeniy Polyakov 2005-08-17 15:17:26 +0400 22) 	0x3C00, 0xFCC1, 0xFD81, 0x3D40, 0xFF01, 0x3FC0, 0x3E80, 0xFE41,
7657ec1fcb69e (Evgeniy Polyakov 2005-08-17 15:17:26 +0400 23) 	0xFA01, 0x3AC0, 0x3B80, 0xFB41, 0x3900, 0xF9C1, 0xF881, 0x3840,
7657ec1fcb69e (Evgeniy Polyakov 2005-08-17 15:17:26 +0400 24) 	0x2800, 0xE8C1, 0xE981, 0x2940, 0xEB01, 0x2BC0, 0x2A80, 0xEA41,
7657ec1fcb69e (Evgeniy Polyakov 2005-08-17 15:17:26 +0400 25) 	0xEE01, 0x2EC0, 0x2F80, 0xEF41, 0x2D00, 0xEDC1, 0xEC81, 0x2C40,
7657ec1fcb69e (Evgeniy Polyakov 2005-08-17 15:17:26 +0400 26) 	0xE401, 0x24C0, 0x2580, 0xE541, 0x2700, 0xE7C1, 0xE681, 0x2640,
7657ec1fcb69e (Evgeniy Polyakov 2005-08-17 15:17:26 +0400 27) 	0x2200, 0xE2C1, 0xE381, 0x2340, 0xE101, 0x21C0, 0x2080, 0xE041,
7657ec1fcb69e (Evgeniy Polyakov 2005-08-17 15:17:26 +0400 28) 	0xA001, 0x60C0, 0x6180, 0xA141, 0x6300, 0xA3C1, 0xA281, 0x6240,
7657ec1fcb69e (Evgeniy Polyakov 2005-08-17 15:17:26 +0400 29) 	0x6600, 0xA6C1, 0xA781, 0x6740, 0xA501, 0x65C0, 0x6480, 0xA441,
7657ec1fcb69e (Evgeniy Polyakov 2005-08-17 15:17:26 +0400 30) 	0x6C00, 0xACC1, 0xAD81, 0x6D40, 0xAF01, 0x6FC0, 0x6E80, 0xAE41,
7657ec1fcb69e (Evgeniy Polyakov 2005-08-17 15:17:26 +0400 31) 	0xAA01, 0x6AC0, 0x6B80, 0xAB41, 0x6900, 0xA9C1, 0xA881, 0x6840,
7657ec1fcb69e (Evgeniy Polyakov 2005-08-17 15:17:26 +0400 32) 	0x7800, 0xB8C1, 0xB981, 0x7940, 0xBB01, 0x7BC0, 0x7A80, 0xBA41,
7657ec1fcb69e (Evgeniy Polyakov 2005-08-17 15:17:26 +0400 33) 	0xBE01, 0x7EC0, 0x7F80, 0xBF41, 0x7D00, 0xBDC1, 0xBC81, 0x7C40,
7657ec1fcb69e (Evgeniy Polyakov 2005-08-17 15:17:26 +0400 34) 	0xB401, 0x74C0, 0x7580, 0xB541, 0x7700, 0xB7C1, 0xB681, 0x7640,
7657ec1fcb69e (Evgeniy Polyakov 2005-08-17 15:17:26 +0400 35) 	0x7200, 0xB2C1, 0xB381, 0x7340, 0xB101, 0x71C0, 0x7080, 0xB041,
7657ec1fcb69e (Evgeniy Polyakov 2005-08-17 15:17:26 +0400 36) 	0x5000, 0x90C1, 0x9181, 0x5140, 0x9301, 0x53C0, 0x5280, 0x9241,
7657ec1fcb69e (Evgeniy Polyakov 2005-08-17 15:17:26 +0400 37) 	0x9601, 0x56C0, 0x5780, 0x9741, 0x5500, 0x95C1, 0x9481, 0x5440,
7657ec1fcb69e (Evgeniy Polyakov 2005-08-17 15:17:26 +0400 38) 	0x9C01, 0x5CC0, 0x5D80, 0x9D41, 0x5F00, 0x9FC1, 0x9E81, 0x5E40,
7657ec1fcb69e (Evgeniy Polyakov 2005-08-17 15:17:26 +0400 39) 	0x5A00, 0x9AC1, 0x9B81, 0x5B40, 0x9901, 0x59C0, 0x5880, 0x9841,
7657ec1fcb69e (Evgeniy Polyakov 2005-08-17 15:17:26 +0400 40) 	0x8801, 0x48C0, 0x4980, 0x8941, 0x4B00, 0x8BC1, 0x8A81, 0x4A40,
7657ec1fcb69e (Evgeniy Polyakov 2005-08-17 15:17:26 +0400 41) 	0x4E00, 0x8EC1, 0x8F81, 0x4F40, 0x8D01, 0x4DC0, 0x4C80, 0x8C41,
7657ec1fcb69e (Evgeniy Polyakov 2005-08-17 15:17:26 +0400 42) 	0x4400, 0x84C1, 0x8581, 0x4540, 0x8701, 0x47C0, 0x4680, 0x8641,
7657ec1fcb69e (Evgeniy Polyakov 2005-08-17 15:17:26 +0400 43) 	0x8201, 0x42C0, 0x4380, 0x8341, 0x4100, 0x81C1, 0x8081, 0x4040
7657ec1fcb69e (Evgeniy Polyakov 2005-08-17 15:17:26 +0400 44) };
7657ec1fcb69e (Evgeniy Polyakov 2005-08-17 15:17:26 +0400 45) EXPORT_SYMBOL(crc16_table);
7657ec1fcb69e (Evgeniy Polyakov 2005-08-17 15:17:26 +0400 46) 
7657ec1fcb69e (Evgeniy Polyakov 2005-08-17 15:17:26 +0400 47) /**
2f72100c01dd3 (Randy Dunlap     2006-06-25 05:48:59 -0700 48)  * crc16 - compute the CRC-16 for the data buffer
2f72100c01dd3 (Randy Dunlap     2006-06-25 05:48:59 -0700 49)  * @crc:	previous CRC value
2f72100c01dd3 (Randy Dunlap     2006-06-25 05:48:59 -0700 50)  * @buffer:	data pointer
2f72100c01dd3 (Randy Dunlap     2006-06-25 05:48:59 -0700 51)  * @len:	number of bytes in the buffer
7657ec1fcb69e (Evgeniy Polyakov 2005-08-17 15:17:26 +0400 52)  *
2f72100c01dd3 (Randy Dunlap     2006-06-25 05:48:59 -0700 53)  * Returns the updated CRC value.
7657ec1fcb69e (Evgeniy Polyakov 2005-08-17 15:17:26 +0400 54)  */
7657ec1fcb69e (Evgeniy Polyakov 2005-08-17 15:17:26 +0400 55) u16 crc16(u16 crc, u8 const *buffer, size_t len)
7657ec1fcb69e (Evgeniy Polyakov 2005-08-17 15:17:26 +0400 56) {
7657ec1fcb69e (Evgeniy Polyakov 2005-08-17 15:17:26 +0400 57) 	while (len--)
7657ec1fcb69e (Evgeniy Polyakov 2005-08-17 15:17:26 +0400 58) 		crc = crc16_byte(crc, *buffer++);
7657ec1fcb69e (Evgeniy Polyakov 2005-08-17 15:17:26 +0400 59) 	return crc;
7657ec1fcb69e (Evgeniy Polyakov 2005-08-17 15:17:26 +0400 60) }
7657ec1fcb69e (Evgeniy Polyakov 2005-08-17 15:17:26 +0400 61) EXPORT_SYMBOL(crc16);
7657ec1fcb69e (Evgeniy Polyakov 2005-08-17 15:17:26 +0400 62) 
7657ec1fcb69e (Evgeniy Polyakov 2005-08-17 15:17:26 +0400 63) MODULE_DESCRIPTION("CRC16 calculations");
7657ec1fcb69e (Evgeniy Polyakov 2005-08-17 15:17:26 +0400 64) MODULE_LICENSE("GPL");
7657ec1fcb69e (Evgeniy Polyakov 2005-08-17 15:17:26 +0400 65)