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/*
Copyright 2006 Arastra, Inc.
Copyright 2001, 2002 Georges Menie (www.menie.org)
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include <string.h>
#include <delay.h>
#include <uart8250.h>
static int _inbyte(int msec)
{
while (!uart8250_can_rx_byte(CONFIG_TTYS0_BASE)) {
udelay(1000);
if (msec-- <= 0)
return -1;
}
return uart8250_rx_byte(CONFIG_TTYS0_BASE);
}
static void _outbyte(unsigned char c)
{
uart8250_tx_byte(CONFIG_TTYS0_BASE, c);
}
static unsigned short crc16_ccitt(const unsigned char *buf, int sz)
{
unsigned short crc = 0;
while (--sz >= 0) {
int i;
crc ^= (unsigned short) *buf++ << 8;
for (i = 0; i < 8; i++)
if (crc & 0x8000)
crc = crc << 1 ^ 0x1021;
else
crc <<= 1;
}
return crc;
}
#define SOH 0x01
#define STX 0x02
#define EOT 0x04
#define ACK 0x06
#define NAK 0x15
#define CAN 0x18
#define CTRLZ 0x1A
#define DLY_1S 1000
#define MAXRETRANS 25
static int check(int crc, const unsigned char *buf, int sz)
{
if (crc) {
unsigned short crc = crc16_ccitt(buf, sz);
unsigned short tcrc = (buf[sz]<<8)+buf[sz+1];
if (crc == tcrc)
return 1;
}
else {
int i;
unsigned char cks = 0;
for (i = 0; i < sz; ++i) {
cks += buf[i];
}
if (cks == buf[sz])
return 1;
}
return 0;
}
static void flushinput(void)
{
while (_inbyte(((DLY_1S)*3)>>1) >= 0)
;
}
int xmodemReceive(unsigned char *dest, int destsz)
{
unsigned char xbuff[1030]; /* 1024 for XModem 1k + 3 head chars + 2 crc + nul */
unsigned char *p;
int bufsz, crc = 0;
unsigned char trychar = 'C';
unsigned char packetno = 1;
int i, c, len = 0;
int retry, retrans = MAXRETRANS;
for(;;) {
for( retry = 0; retry < 16; ++retry) {
if (trychar) _outbyte(trychar);
if ((c = _inbyte((DLY_1S)<<1)) >= 0) {
switch (c) {
case SOH:
bufsz = 128;
goto start_recv;
case STX:
bufsz = 1024;
goto start_recv;
case EOT:
flushinput();
_outbyte(ACK);
return len; /* normal end */
case CAN:
if ((c = _inbyte(DLY_1S)) == CAN) {
flushinput();
_outbyte(ACK);
return -1; /* canceled by remote */
}
break;
default:
break;
}
}
}
if (trychar == 'C') { trychar = NAK; continue; }
flushinput();
_outbyte(CAN);
_outbyte(CAN);
_outbyte(CAN);
return -2; /* sync error */
start_recv:
if (trychar == 'C') crc = 1;
trychar = 0;
p = xbuff;
*p++ = c;
for (i = 0; i < (bufsz+(crc?1:0)+3); ++i) {
if ((c = _inbyte(DLY_1S)) < 0) goto reject;
*p++ = c;
}
if (xbuff[1] == (unsigned char)(~xbuff[2]) &&
(xbuff[1] == packetno || xbuff[1] == (unsigned char)packetno-1) &&
check(crc, &xbuff[3], bufsz)) {
if (xbuff[1] == packetno) {
register int count = destsz - len;
if (count > bufsz) count = bufsz;
if (count > 0) {
memcpy (&dest[len], &xbuff[3], count);
len += count;
}
++packetno;
retrans = MAXRETRANS+1;
}
if (--retrans <= 0) {
flushinput();
_outbyte(CAN);
_outbyte(CAN);
_outbyte(CAN);
return -3; /* too many retry error */
}
_outbyte(ACK);
continue;
}
reject:
flushinput();
_outbyte(NAK);
}
}
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