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/*=============================================================================

//

//      calmbreaker.c

//

//      Host to CalmBreaker communication utility.

//

//=============================================================================

//####ECOSGPLCOPYRIGHTBEGIN####

// -------------------------------------------

// This file is part of eCos, the Embedded Configurable Operating System.

// Copyright (C) 1998, 1999, 2000, 2001, 2002 Red Hat, Inc.

//

// eCos is free software; you can redistribute it and/or modify it under

// the terms of the GNU General Public License as published by the Free

// Software Foundation; either version 2 or (at your option) any later version.

//

// eCos 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 General Public License

// for more details.

//

// You should have received a copy of the GNU General Public License along

// with eCos; if not, write to the Free Software Foundation, Inc.,

// 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.

//

// As a special exception, if other files instantiate templates or use macros

// or inline functions from this file, or you compile this file and link it

// with other works to produce a work based on this file, this file does not

// by itself cause the resulting work to be covered by the GNU General Public

// License. However the source code for this file must still be made available

// in accordance with section (3) of the GNU General Public License.

//

// This exception does not invalidate any other reasons why a work based on

// this file might be covered by the GNU General Public License.

//

// Alternative licenses for eCos may be arranged by contacting Red Hat, Inc.

// at http://sources.redhat.com/ecos/ecos-license/

// -------------------------------------------

//####ECOSGPLCOPYRIGHTEND####

//=============================================================================

//#####DESCRIPTIONBEGIN####

//

// Author(s):    msalter

// Contributors: msalter

// Date:         2001-03-02

// Purpose:

// Description:  Host to CalmBreaker communication utility.

//

//####DESCRIPTIONEND####

//

//===========================================================================*/

#include <termios.h>

#include <fcntl.h>

#include <stdio.h>

int ser_fd;  // The com port

int is_risc16;

void

tty_setup(int fd)

{

    struct termios t;

    memset(&t, 0, sizeof(struct termios));

    t.c_oflag = 0;

    t.c_lflag = 0;

    t.c_cflag &= ~(CSIZE | PARENB);

    t.c_cflag |= CS8 | CREAD /*| CSTOPB*/;

    t.c_cflag |= CLOCAL;                   // ignore modem status lines

    t.c_iflag = IGNBRK | IGNPAR /* | ISTRIP */ ;

    t.c_lflag &= ~ICANON;                  // non-canonical mode

    t.c_lflag &= ~(ECHO|ECHOE|ECHOK|ECHOKE);

    t.c_cc[VMIN]  = 0;

    t.c_cc[VTIME] = 10;  // 1 second timeout

    t.c_cflag &= ~CRTSCTS;

    /* set speed */

    cfsetispeed(&t, B57600);

    cfsetospeed(&t, B57600);

    tcdrain(fd);

    if (tcsetattr(fd, TCSANOW, &t) < 0)

    {

        perror("tcssetattr");

        exit(1);

    }

}

static void

do_putc(unsigned char ch)

{

    // keep retrying until sent or an error is returned

    while (write(ser_fd, &ch, 1) == 0);

}

static int

do_getc(unsigned char *ucp)

{

    return read(ser_fd, ucp, 1);

}

static int

wait_for_ack(void)

{

    unsigned char ch;

    int i;

    // try for 5 seconds

    for (i = 0; i < 5; i++) {

        if (do_getc(&ch)) {

            if (ch == '+')

                return 1;

            printf("Bad ack [0x%x]\n", ch);

        }

    }

    printf("No ack\n");

    return 0;

}

// Add prefix and checksum to packet and send to MDS board.

void

send_packet_noack(unsigned char *pkt, int len)

{

    unsigned char cksum = 0;

    do_putc(':');

    while (len-- > 0) {

        cksum += *pkt;

        do_putc(*pkt++);

    }

    do_putc(0x100 - cksum);

}

// Add prefix and checksum to packet and send to MDS board.

void

send_packet(unsigned char *pkt, int len)

{

    send_packet_noack(pkt, len);

    wait_for_ack();

}

// Send a packet of code or data (max 0xff bytes)

int

send_data_packet(int is_data, unsigned addr, unsigned char *buf, int buflen)

{

    unsigned char uc, cksum = 0;

    int i;

    do_putc(':');

    // code or data?

    uc = is_data ? 0x52 : 0x51;

    cksum += uc;

    do_putc(uc);

    // code/data nwords?

    uc = buflen >> 1;

    cksum += uc;

    do_putc(uc);

    // code/data address

    uc = (unsigned char)(addr >> 24);

    cksum += uc;

    do_putc(uc);

    uc = (unsigned char)(addr >> 16);

    cksum += uc;

    do_putc(uc);

    uc = (unsigned char)(addr >> 8);

    cksum += uc;

    do_putc(uc);

    uc = (unsigned char)addr;

    cksum += uc;

    do_putc(uc);

    while (buflen-- > 0) {

        cksum += *buf;

        do_putc(*buf++);

    }

    do_putc(0x100 - cksum);

    return wait_for_ack();

}

void

send_command(unsigned char uc)

{

    send_packet(&uc, 1);

}

void

send_command_noack(unsigned char uc)

{

    send_packet_noack(&uc, 1);

}

// Simple single-byte commands

void target_reset(void) { send_command(0x20); }

void target_singlestep(void) { send_command(0x22); }

void target_singlecycle(void) { send_command(0x23); }

void target_stop(void) { send_command(0x24); }

void target_run(void) { send_command_noack(0x25); }

#define DOWNLOAD_CHUNK_SIZE 254

int

download_words(int is_data, unsigned addr, unsigned char *buf, int buflen)

{

    while (buflen >= DOWNLOAD_CHUNK_SIZE) {

        if (!send_data_packet(is_data, addr, buf, DOWNLOAD_CHUNK_SIZE)) {

            printf("Error downloading %d bytes of %s to 0x%x\n",

                   DOWNLOAD_CHUNK_SIZE, (is_data ? "data" : "code"), addr);

            return 0;

        }

        addr += DOWNLOAD_CHUNK_SIZE;

        buf += DOWNLOAD_CHUNK_SIZE;

        buflen -= DOWNLOAD_CHUNK_SIZE;

    }

    if (buflen && !send_data_packet(is_data, addr, buf, buflen)) {

        printf("Error downloading %d bytes of %s to 0x%x\n",

               buflen, (is_data ? "data" : "code"), addr);

        return 0;

    }

    return 1;

}

static inline int

gethexnibble(FILE *fp)

{

    int ch;

    ch = getc(fp);

    if (ch >= '0' && ch <= '9')

        return (ch - '0');

    if (ch >= 'a' && ch <= 'f')

        return (ch - 'a' + 10);

    if (ch >= 'A' && ch <= 'F')

        return (ch - 'A' + 10);

    if (ch == EOF)

        fprintf(stderr, "Unexpected EOF\n");

    else

        fprintf(stderr, "Bad hex char\n");

    return -1;

}

static inline int

gethexbyte(FILE *fp)

{

    int nib;

    unsigned char n;

    if ((nib = gethexnibble(fp)) < 0)

        return -1;

    n = nib << 4;

    if ((nib = gethexnibble(fp)) < 0)

        return -1;

    n |= nib;

    return n;

}

static inline int

chk_cksum(FILE *fp, unsigned int cksum)

{

    int n;

    if ((n = gethexbyte(fp)) < 0)

        return -1;

    cksum = ~cksum & 0xff;

    if (cksum != n) {

        fprintf(stderr, "Bad cksum[%02x]\n", cksum);

        return -1;

    }

    return 0;

}

int

load_srec(FILE *fp, int is_data)

{

    int count, dcount, data, n, addr_bytes = 0, is_term, is_comment;

    unsigned long address, cksum;

    unsigned char data_buf[256];

    is_comment = is_term = 0;

    do {

        if ((n = getc(fp)) == EOF)

            return 1;

    } while (n != 'S');

    switch (n = gethexnibble(fp)) {

      case 0:

      case 5:

        is_comment = 1;

        break;

      case 1:

      case 2:

      case 3:

        addr_bytes = n + 1;

        break;

      case 7:

      case 8:

      case 9:

        is_term = 1;

        addr_bytes = 11 - n;

        break;

      default:

        if (n < 0)

            return -1;

        fprintf(stderr, "Bad record type: %d\n", n);

        return -1;

    }

    if ((count = gethexbyte(fp)) < 0)

        return -1;

    cksum = count;

    --count; // don't count chksum

    if (is_comment) {

        while (count > 0) {

            if ((n = gethexbyte(fp)) < 0)

                return -1;

            cksum += n;

            --count;

        }

        if (chk_cksum(fp,cksum) < 0)

            return -1;

        return 0;

    }

    address = 0;

    while (count > 0 && addr_bytes) {

        if ((n = gethexbyte(fp)) < 0)

            return -1;

        cksum += n;

        address = (address << 8) | n;

        --addr_bytes;

        --count;

    }

    if (is_risc16 && (address & 0x400000))

        address &= 0x3fffff;

    if (is_term) {

        if (count || addr_bytes) {

            fprintf(stderr, "Malformed record cnt[%d] abytes[%d]\n",

                    count, addr_bytes);

            return -1;

        }

        if (chk_cksum(fp, cksum) == 0) {

            fprintf(stderr, "Setting start address: 0x%08x\n", address);

            return 1;

        }

        return -1;

    }

    for (dcount = 0; dcount < count; dcount++) {

        if ((data = gethexbyte(fp)) < 0)

            return -1;

        cksum += data;

        data_buf[dcount] = data;

    }

    if (chk_cksum(fp, cksum) < 0)

        return -1;

    if (dcount & 1)

        dcount++;

    if (!download_words(is_data, address, data_buf, dcount))

        return -1;

    return 0;

}

int

load_hex(FILE *fp, int is_data)

{

    int count, n, i;

    unsigned long address;

    unsigned char data_buf[256];

    do {

        if ((n = getc(fp)) == EOF)

            return 1;

    } while (n == '\r' || n == '\n');

    if (n == '#') {

        do {

            if ((n = getc(fp)) == EOF)

                return 1;

        } while (n != '\r' && n != '\n');

        return 0;

    }

    if (n != ':') {

        fprintf(stderr, "Unrecognized HEX line start.\n");

        return -1;

    }

    if ((count = gethexbyte(fp)) < 0)

        return -1;

    address = 0;

    for (i = 0; i < 4; i++) {

        if ((n = gethexbyte(fp)) < 0)

            return -1;

        address = (address << 8) | n;

    }

    // skip type byte

    if ((n = gethexbyte(fp)) < 0)

        return -1;

    for (i = 0; i < count; i++) {

        if ((n = gethexbyte(fp)) < 0)

            return -1;

        data_buf[i] = n;

    }

    // skip chksum byte

    if ((n = gethexbyte(fp)) < 0)

        return -1;

    if (count & 1)

        ++count;

    if (!download_words(is_data, address, data_buf, count))

        return -1;

    return 0;

}

int

main(int argc, char *argv[])

{

    int i;

    int do_download = 0, is_data, is_hex;

    int do_run = 0, do_reset = 0;

    char *filename = NULL;

    char *portname = "/dev/ttyS0";

    FILE *infile;

    if (argc == 1) {

        fprintf(stderr, "Usage: mds_talk [--run] [--reset] [--srec-code | --srec-date | --hex-code | --hex-data] [-f filename] [-p serial_dev]\n");

        exit(1);

    }

    is_risc16 = 0;

    for (i = 1; i < argc; i++) {

        if (!strcmp(argv[i], "--srec-code")) {

            do_download = 1;

            is_data = 0;

            is_hex = 0;

        } else if (!strcmp(argv[i], "--srec-data")) {

            do_download = 1;

            is_data = 1;

            is_hex = 0;

        } else if (!strcmp(argv[i], "--hex-code")) {

            do_download = 1;

            is_data = 0;

            is_hex = 1;

        } else if (!strcmp(argv[i], "--hex-data")) {

            do_download = 1;

            is_data = 1;

            is_hex = 1;

        } else if (!strcmp(argv[i], "--reset"))

            do_reset = 1;

        else if (!strcmp(argv[i], "--run"))

            do_run = 1;

        else if (!strcmp(argv[i], "-f")) {

            if (++i >= argc) {

                fprintf(stderr, "Missing filename\n");

                exit(1);

            }

            filename = argv[i];

        } else if (!strcmp(argv[i], "-p")) {

            if (++i >= argc) {

                fprintf(stderr, "Missing serial port name\n");

                exit(1);

            }

            portname = argv[i];

        } else if (!strcmp(argv[i], "--risc16")) {

            is_risc16 = 1;

        } else {

            fprintf(stderr, "Unknown argument \"%s\"\n", argv[i]);

            exit(1);

        }

    }

    if ((ser_fd = open(portname, O_RDWR | O_NOCTTY)) < 0) {

        fprintf(stderr, "Can't open port %s\n", portname);

        exit(1);

    }

    tty_setup(ser_fd);

    if (filename) {

        if ((infile = fopen(filename, "r")) == NULL) {

            fprintf(stderr, "Can't open file %s\n", filename);

            exit(1);

        }

    } else

        infile = stdin;

    if (do_reset)

        target_reset();

    if (do_download) {

        if (is_hex)

            while (!load_hex(infile, is_data)) ;

        else

            while (!load_srec(infile, is_data)) ;

    }

    if (do_run)

        target_run();

}