Subversion Repositories minsoc

/* cable_parallel.c - Parallel cable drivers (XPC3 and XESS) for the Advanced JTAG Bridge

   Copyright (C) 2001 Marko Mlinar, markom@opencores.org

   Copyright (C) 2004 György Jeney, nog@sdf.lonestar.org

   This program 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 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 General Public License for more details.

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

   along with this program; if not, write to the Free Software

   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */

#include <stdio.h>

#include <unistd.h>

#include <sys/types.h>

#include <sys/stat.h>

#include <fcntl.h>

#include <linux/ppdev.h>

#include <linux/ioctl.h>

#include <linux/parport.h>

#include "cable_common.h"

#include "errcodes.h"

// Common functions used by both cable types

static int cable_parallel_out(uint8_t value);

static int cable_parallel_inout(uint8_t value, uint8_t *inval);

int fd;

/////////////////////////////////////////////////////////////////////////////////

/*-------------------------------------[ Parallel port specific functions ]---*/

///////////////////////////////////////////////////////////////////////////////

int cable_parallel_init()

{

/*

  //#ifndef WIN32

  if (ioperm(base, 3, 1)) {

    fprintf(stderr, "Couldn't get the port at %x\n", base);

    perror("Root privileges are required.\n");

    return APP_ERR_INIT_FAILED;

  }

  printf("Connected to parallel port at %x\n", base);

  printf("Dropping root privileges.\n");

  setreuid(getuid(), getuid());

  //#endif

*/

  int mode = IEEE1284_MODE_COMPAT;

  fd = open("/dev/parport0", O_RDWR | O_NONBLOCK);

  if (fd == -1)

  {

    perror("Not able to acquire the device desriptor\n");

    return APP_ERR_INIT_FAILED;

  }

  if (ioctl(fd, PPCLAIM) == -1)

  {

    perror("Fail to claim the interface for itself.\n");

    return APP_ERR_INIT_FAILED;

  }

  if (ioctl(fd, PPSETMODE, &mode) == -1)

  {

    perror("Setting compatibility mode failed.\n");

    return APP_ERR_INIT_FAILED;

  }

  return APP_ERR_NONE;

}

int cable_parallel_opt(int c, char *str)

{

  switch(c) {

  case 'p':

//    if(!sscanf(str, "%x", &base)) {

//      fprintf(stderr, "p parameter must have a hex number as parameter\n");

      return APP_ERR_BAD_PARAM;

//    }

    break;

  default:

    fprintf(stderr, "Unknown parameter '%c'\n", c);

    return APP_ERR_BAD_PARAM;

  }

  return APP_ERR_NONE;

}

/*-----------------------------------------[ Physical board wait function ]---*/

void cable_parallel_phys_wait()

{

  /* Multiple users have reported poor performance of parallel cables,

   * which has been traced to usleep() sleeping much longer than

   * microseconds.  The same users have reported error-free functionality

   * and an order of magnitude improvement in upload speed.

   * If you get strange data errors while running, add this sleep back

   * in, or perhaps a busy-wait delay.

   */

  /* usleep(10); */

}

/*----------------------------------------------[ xpc3 specific functions ]---*/

int cable_xpc3_out(uint8_t value)

{

  uint8_t out = 0;

  /* First convert the bits in value byte to the ones that the cable wants */

  if(value & TCLK_BIT)

    out |= 0x02; /* D1 pin 3 */

  if(value & TRST_BIT)

    out |= 0x10; /* Not used */

  if(value & TDI_BIT)

    out |= 0x01; /* D0 pin 2 */

  if(value & TMS_BIT)

    out |= 0x04; /* D2 pin 4 */

  return cable_parallel_out(out);

}

int cable_xpc3_inout(uint8_t value, uint8_t *inval)

{

  uint8_t in;

  int retval;

  uint8_t out = 0;

  /* First convert the bits in value byte to the ones that the cable wants */

  if(value & TCLK_BIT)

    out |= 0x02; /* D1 pin 3 */

  if(value & TRST_BIT)

    out |= 0x10; /* Not used */

  if(value & TDI_BIT)

    out |= 0x01; /* D0 pin 2 */

  if(value & TMS_BIT)

    out |= 0x04; /* D2 pin 4 */

  retval = cable_parallel_inout(out, &in);

  if(in & 0x10) /* S6 pin 13 */

    *inval = 1;

  else

    *inval = 0;

  return retval;

}

/*----------------------------------------------[ xess specific functions ]---*/

int cable_xess_out(uint8_t value)

{

  uint8_t out = 0;

  /* First convert the bits in value byte to the ones that the cable wants */

  if(value & TCLK_BIT)

    out |= 0x04; /* D2 pin 4 */

  if(value & TRST_BIT)

    out |= 0x08; /* D3 pin 5 */

  if(value & TDI_BIT)

    out |= 0x10; /* D4 pin 6 */

  if(value & TMS_BIT)

    out |= 0x20; /* D3 pin 5 */

  return cable_parallel_out(out);

}

uint8_t cable_xess_inout(uint8_t value, uint8_t *inval)

{

  uint8_t in;

  int retval;

  uint8_t out = 0;

  /* First convert the bits in value byte to the ones that the cable wants */

  if(value & TCLK_BIT)

    out |= 0x04; /* D2 pin 4 */

  if(value & TRST_BIT)

    out |= 0x08; /* D3 pin 5 */

  if(value & TDI_BIT)

    out |= 0x10; /* D4 pin 6 */

  if(value & TMS_BIT)

    out |= 0x20; /* D3 pin 5 */

  retval = cable_parallel_inout(out, &in);

  if(in & 0x20) /* S5 pin 12*/

    *inval = 1;

  else

    *inval = 0;

  return retval;

}

/*----------------------------------------------[ common helper functions ]---*/

// 'static' for internal access only

static int cable_parallel_out(uint8_t value)

{

  ioctl(fd, PPWDATA, &value);

  return APP_ERR_NONE;

}

static int cable_parallel_inout(uint8_t value, uint8_t *inval)

{

  ioctl(fd, PPRSTATUS, inval);

  ioctl(fd, PPWDATA, &value);

  return APP_ERR_NONE;

}