54  * CRC routines adapted from public domain code written by Lammert Bies.
65  * CRC checking is enabled by default, but can be disabled at runtime
166 	unsigned char	use_crc;	/* do crc checking for this command */
194 	unsigned int	crc_enabled;	/* crc checking is enabled */
195 	unsigned int	crc_init_done;  /* whether the initial crc setting has
205 	unsigned int		use_crc;	/* command CRC checking */
267 update_crc7(uint8_t crc, uint8_t *buf, unsigned int len)  in update_crc7()  argument
273 		tmp = (crc << 1) ^ buf[i];  in update_crc7()
274 		crc = crc7tab[tmp];  in update_crc7()
277 	return (crc);  in update_crc7()
281 update_crc16(uint16_t crc, uint8_t *buf, unsigned int len)  in update_crc16()  argument
289 		tmp = (crc >> 8) ^ c16;  in update_crc16()
290 		crc = (crc << 8) ^ crc16tab[tmp];  in update_crc16()
293 	return (crc);  in update_crc16()
302 	uint8_t crc, c;  in init_crc7tab()  local
307 		crc = (c & 0x80) ? c ^ P_CRC7 : c;  in init_crc7tab()
310 			crc = crc << 1;  in init_crc7tab()
312 			if (crc & 0x80)  in init_crc7tab()
313 				crc = crc ^ P_CRC7;  in init_crc7tab()
316 		crc7tab[i] = crc;  in init_crc7tab()
326 	uint16_t crc, c;  in init_crc16tab()  local
330 		crc = 0;  in init_crc16tab()
335 			if ((crc ^ c) & 0x8000) crc = ( crc << 1 ) ^ P_CCITT;  in init_crc16tab()
336 			else                    crc =   crc << 1;  in init_crc16tab()
341 		crc16tab[i] = crc;  in init_crc16tab()
454 	    &sc->use_crc, sizeof(sc->use_crc), "Enable/disable crc checking");  in mmcspi_attach()
1185 	uint8_t crc;  in mmcspi_send_cmd()  local
1212 		crc = update_crc7(CRC7_INITIAL, &txbuf[1], 5);  in mmcspi_send_cmd()
1214 		crc = 0;  in mmcspi_send_cmd()
1216 	txbuf[6] = (crc << 1) | 0x01;  in mmcspi_send_cmd()
1343 	/* copy any crc captured in the poll buf to the crc buf */  in mmcspi_read_block()
1346 	/* get any remaining crc */  in mmcspi_read_block()
1348 		TRACE(dev, DETAILS, "crc bytes to read = %u\n",  in mmcspi_read_block()
1354 			TRACE(dev, ERROR, "spi read of crc failed\n");  in mmcspi_read_block()
1361 	 * The following crc checking code is deliberately structured to  in mmcspi_read_block()
1362 	 * allow a passing crc-7 check to override a failing crc-16 check  in mmcspi_read_block()
1435 	 * Retry stop commands that fail due to bad crc here because having  in mmcspi_send_stop()
1450 		/* retry on crc error */  in mmcspi_send_stop()
1462 		 * caller's retry-on-crc-error mechanism, effectively  in mmcspi_send_stop()
1500 		 * The CID and CSD data blocks contain both a trailing crc-7  in mmcspi_read_phase()
1501 		 * inside the data block and the standard crc-16 following  in mmcspi_read_phase()
1504 		 * When crc checking has been enabled via CMD59, some cards  in mmcspi_read_phase()
1505 		 * send CID and CSD data blocks with correct crc-7 values  in mmcspi_read_phase()
1506 		 * but incorrect crc-16 values.  read_block will accept  in mmcspi_read_phase()
1507 		 * those responses as valid as long as the crc-7 is correct.  in mmcspi_read_phase()
1547 	uint16_t crc;  in mmcspi_write_block()  local
1552 		crc = update_crc16(CRC16_INITIAL, data, MMCSPI_DATA_BLOCK_LEN);  in mmcspi_write_block()
1554 		crc = 0;  in mmcspi_write_block()
1556 	TRACE(dev, ACTION, "write block(512) crc=0x%04x\n", crc);  in mmcspi_write_block()
1565 	txbuf[0] = crc >> 8;  in mmcspi_write_block()
1566 	txbuf[1] = crc & 0xff;  in mmcspi_write_block()
1628 			 * A CRC error can't be ignored here, even if crc  in mmcspi_write_phase()