1 // SPDX-License-Identifier: eCos-2.0
7  *      RedBoot stream handler for xyzModem protocol
14  * Date:         2000-07-14
27 #include <u-boot/crc.h>
30 /* Assumption - run xyzModem protocol over the console port */
36 #define ACK 0x06  macro
40 #define EOF 0x1A		/* ^Z for DOS officionados */
58 #define xyzModem_CAN_COUNT                3	/* Wait for 3 CAN before quitting */
103       ret = (c - '0');  in _from_hex()
107       ret = (c - 'a' + 0x0a);  in _from_hex()
111       ret = (c - 'A' + 0x0A);  in _from_hex()
122       c = (c - 'A') + 'a';  in _tolower()
228   zm_dump_buf (zm_buf, zm_bp - zm_buf);  in zm_dump()
236 /* Wait for the line to go idle */
266       CYGACC_COMM_IF_PUTC (*xyz.__chan, ACK);  in xyzModem_get_hdr()
294 		  /* Wait for multiple CAN to avoid early quits */  in xyzModem_get_hdr()
301 		  CYGACC_COMM_IF_PUTC (*xyz.__chan, ACK);  in xyzModem_get_hdr()
302 		  ZM_DEBUG (zm_dprintf ("ACK on EOT #%d\n", __LINE__));  in xyzModem_get_hdr()
307 	      /* Ignore, waiting for start of header */  in xyzModem_get_hdr()
338   for (i = 0; i < xyz.len; i++)  in xyzModem_get_hdr()
374 		("Framing error - blk: %x/%x/%x\n", xyz.blk, xyz.cblk,  in xyzModem_get_hdr()
386 	  ZM_DEBUG (zm_dprintf ("CRC error - recvd: %02x%02x, computed: %x\n",  in xyzModem_get_hdr()
394       for (i = 0; i < xyz.len; i++)  in xyzModem_get_hdr()
401 		    ("Checksum error - recvd: %x, computed: %x\n", xyz.crc1,  in xyzModem_get_hdr()
419   if (info->mode == xyzModem_zmodem)  in xyzModem_stream_open()
422       return -1;  in xyzModem_stream_open()
433   xyz.mode = info->mode;  in xyzModem_stream_open()
445       /* X-modem doesn't have an information header - exit here */  in xyzModem_stream_open()
450   while (retries-- > 0)  in xyzModem_stream_open()
455 	  /* Y-modem file information header */  in xyzModem_stream_open()
471 	  if (--crc_retries <= 0)  in xyzModem_stream_open()
473 	  CYGACC_CALL_IF_DELAY_US (5 * 100000);	/* Extra delay for startup */  in xyzModem_stream_open()
485   return -1;  in xyzModem_stream_open()
502 	  while (retries-- > 0)  in xyzModem_stream_read()
511 				("ACK block %d (%d)\n", xyz.blk, __LINE__));  in xyzModem_stream_read()
518 			  if ((xyz.bufp[xyz.len - 1] == EOF) &&  in xyzModem_stream_read()
519 			      (xyz.bufp[xyz.len - 2] == EOF) &&  in xyzModem_stream_read()
520 			      (xyz.bufp[xyz.len - 3] == EOF))  in xyzModem_stream_read()
523 				     && (xyz.bufp[xyz.len - 1] == EOF))  in xyzModem_stream_read()
525 				  xyz.len--;  in xyzModem_stream_read()
533 		       * Only do this for Y-modem (and Z-modem should it ever  in xyzModem_stream_read()
534 		       * be supported since it can fall back to Y-modem mode).  in xyzModem_stream_read()
541 			      xyz.len -= (xyz.read_length - xyz.file_length);  in xyzModem_stream_read()
546 		  else if (xyz.blk == ((xyz.next_blk - 1) & 0xFF))  in xyzModem_stream_read()
548 		      /* Just re-ACK this so sender will get on with it */  in xyzModem_stream_read()
549 		      CYGACC_COMM_IF_PUTC (*xyz.__chan, ACK);  in xyzModem_stream_read()
563 		  CYGACC_COMM_IF_PUTC (*xyz.__chan, ACK);  in xyzModem_stream_read()
564 		  ZM_DEBUG (zm_dprintf ("ACK (%d)\n", __LINE__));  in xyzModem_stream_read()
572 		      CYGACC_COMM_IF_PUTC (*xyz.__chan, ACK);  in xyzModem_stream_read()
573 		      ZM_DEBUG (zm_dprintf ("FINAL ACK (%d)\n", __LINE__));  in xyzModem_stream_read()
585 	      xyz.len = -1;  in xyzModem_stream_read()
596 	  size -= len;  in xyzModem_stream_read()
599 	  xyz.len -= len;  in xyzModem_stream_read()
610     ("xyzModem - %s mode, %d(SOH)/%d(STX)/%d(CAN) packets, %d retries\n",  in xyzModem_stream_close()
658        * of the transfer block size, there will almost always be some gunk here.  in xyzModem_stream_terminate()
662       while ((c = (*getc) ()) > -1)  in xyzModem_stream_terminate()