1 // SPDX-License-Identifier: GPL-2.0
3 // mcp251xfd - Microchip MCP251xFD Family CAN controller driver
6 //                    Marc Kleine-Budde <kernel@pengutronix.de>
10 // CAN bus driver for Microchip 25XXFD CAN Controller with SPI Interface
58 static inline u16 mcp251xfd_crc16_byte(u16 crc, const u8 data)  in mcp251xfd_crc16_byte()  argument
60 	u8 index = (crc >> 8) ^ data;  in mcp251xfd_crc16_byte()
62 	return (crc << 8) ^ mcp251xfd_crc16_table[index];  in mcp251xfd_crc16_byte()
65 static u16 mcp251xfd_crc16(u16 crc, u8 const *buffer, size_t len)  in mcp251xfd_crc16()  argument
67 	while (len--)  in mcp251xfd_crc16()
68 		crc = mcp251xfd_crc16_byte(crc, *buffer++);  in mcp251xfd_crc16()
70 	return crc;  in mcp251xfd_crc16()
75 	u16 crc = 0xffff;  in mcp251xfd_crc16_compute()  local
77 	return mcp251xfd_crc16(crc, data, data_size);  in mcp251xfd_crc16_compute()
83 	u16 crc;  in mcp251xfd_crc16_compute2()  local
85 	crc = mcp251xfd_crc16_compute(cmd, cmd_size);  in mcp251xfd_crc16_compute2()
86 	crc = mcp251xfd_crc16(crc, data, data_size);  in mcp251xfd_crc16_compute2()
88 	return crc;  in mcp251xfd_crc16_compute2()