diff options
Diffstat (limited to 'src/lib')
| -rw-r--r-- | src/lib/uart8250.c | 2 | ||||
| -rw-r--r-- | src/lib/xmodem.c | 207 |
2 files changed, 209 insertions, 0 deletions
diff --git a/src/lib/uart8250.c b/src/lib/uart8250.c index 0336926925..b9abc9e219 100644 --- a/src/lib/uart8250.c +++ b/src/lib/uart8250.c @@ -64,6 +64,8 @@ void uart8250_init(unsigned base_port, unsigned divisor, unsigned lcs) outb(0x0, base_port + UART_IER); /* enable fifo's */ outb(0x01, base_port + UART_FCR); + /* assert DTR and RTS so the other end is happy */ + outb(0x03, base_port + UART_MCR); /* Set Baud Rate Divisor to 12 ==> 115200 Baud */ outb(0x80 | lcs, base_port + UART_LCR); outb(divisor & 0xFF, base_port + UART_DLL); diff --git a/src/lib/xmodem.c b/src/lib/xmodem.c new file mode 100644 index 0000000000..aaa98b88ec --- /dev/null +++ b/src/lib/xmodem.c @@ -0,0 +1,207 @@ +/* + 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA +*/ + +#include <string.h> +#include <delay.h> + +extern void uart8250_tx_byte(unsigned, unsigned char); +extern int uart8250_can_rx_byte(unsigned); +extern unsigned char uart8250_rx_byte(unsigned); + +static int _inbyte(int msec) +{ + while (!uart8250_can_rx_byte(TTYS0_BASE)) { + udelay(1000); + if (msec-- <= 0) + return -1; + } + return uart8250_rx_byte(TTYS0_BASE); +} + +static void _outbyte(unsigned char c) +{ + uart8250_tx_byte(TTYS0_BASE, c); +} + +/* CRC16 implementation acording to CCITT standards */ + +static const unsigned short crc16tab[256]= { + 0x0000,0x1021,0x2042,0x3063,0x4084,0x50a5,0x60c6,0x70e7, + 0x8108,0x9129,0xa14a,0xb16b,0xc18c,0xd1ad,0xe1ce,0xf1ef, + 0x1231,0x0210,0x3273,0x2252,0x52b5,0x4294,0x72f7,0x62d6, + 0x9339,0x8318,0xb37b,0xa35a,0xd3bd,0xc39c,0xf3ff,0xe3de, + 0x2462,0x3443,0x0420,0x1401,0x64e6,0x74c7,0x44a4,0x5485, + 0xa56a,0xb54b,0x8528,0x9509,0xe5ee,0xf5cf,0xc5ac,0xd58d, + 0x3653,0x2672,0x1611,0x0630,0x76d7,0x66f6,0x5695,0x46b4, + 0xb75b,0xa77a,0x9719,0x8738,0xf7df,0xe7fe,0xd79d,0xc7bc, + 0x48c4,0x58e5,0x6886,0x78a7,0x0840,0x1861,0x2802,0x3823, + 0xc9cc,0xd9ed,0xe98e,0xf9af,0x8948,0x9969,0xa90a,0xb92b, + 0x5af5,0x4ad4,0x7ab7,0x6a96,0x1a71,0x0a50,0x3a33,0x2a12, + 0xdbfd,0xcbdc,0xfbbf,0xeb9e,0x9b79,0x8b58,0xbb3b,0xab1a, + 0x6ca6,0x7c87,0x4ce4,0x5cc5,0x2c22,0x3c03,0x0c60,0x1c41, + 0xedae,0xfd8f,0xcdec,0xddcd,0xad2a,0xbd0b,0x8d68,0x9d49, + 0x7e97,0x6eb6,0x5ed5,0x4ef4,0x3e13,0x2e32,0x1e51,0x0e70, + 0xff9f,0xefbe,0xdfdd,0xcffc,0xbf1b,0xaf3a,0x9f59,0x8f78, + 0x9188,0x81a9,0xb1ca,0xa1eb,0xd10c,0xc12d,0xf14e,0xe16f, + 0x1080,0x00a1,0x30c2,0x20e3,0x5004,0x4025,0x7046,0x6067, + 0x83b9,0x9398,0xa3fb,0xb3da,0xc33d,0xd31c,0xe37f,0xf35e, + 0x02b1,0x1290,0x22f3,0x32d2,0x4235,0x5214,0x6277,0x7256, + 0xb5ea,0xa5cb,0x95a8,0x8589,0xf56e,0xe54f,0xd52c,0xc50d, + 0x34e2,0x24c3,0x14a0,0x0481,0x7466,0x6447,0x5424,0x4405, + 0xa7db,0xb7fa,0x8799,0x97b8,0xe75f,0xf77e,0xc71d,0xd73c, + 0x26d3,0x36f2,0x0691,0x16b0,0x6657,0x7676,0x4615,0x5634, + 0xd94c,0xc96d,0xf90e,0xe92f,0x99c8,0x89e9,0xb98a,0xa9ab, + 0x5844,0x4865,0x7806,0x6827,0x18c0,0x08e1,0x3882,0x28a3, + 0xcb7d,0xdb5c,0xeb3f,0xfb1e,0x8bf9,0x9bd8,0xabbb,0xbb9a, + 0x4a75,0x5a54,0x6a37,0x7a16,0x0af1,0x1ad0,0x2ab3,0x3a92, + 0xfd2e,0xed0f,0xdd6c,0xcd4d,0xbdaa,0xad8b,0x9de8,0x8dc9, + 0x7c26,0x6c07,0x5c64,0x4c45,0x3ca2,0x2c83,0x1ce0,0x0cc1, + 0xef1f,0xff3e,0xcf5d,0xdf7c,0xaf9b,0xbfba,0x8fd9,0x9ff8, + 0x6e17,0x7e36,0x4e55,0x5e74,0x2e93,0x3eb2,0x0ed1,0x1ef0 +}; + +static unsigned short crc16_ccitt(const void *buf, int len) +{ + register int counter; + register unsigned short crc = 0; + for( counter = 0; counter < len; counter++) + crc = (crc<<8) ^ crc16tab[((crc>>8) ^ *(char *)buf++)&0x00FF]; + 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); + } +} |