/*
 * Copyright (c) 2001 Stephen Williams (steve@icarus.com)
 *
 *    This source code is free software; you can redistribute it
 *    and/or modify it in source code form 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
 */
#if !defined(WINNT) && !defined(macintosh)
#ident "$Id: fpga.c,v 1.5 2001/09/16 01:48:16 steve Exp $"
#endif

# include "config.h"

/*
 * This is a null target module. It does nothing.
 */

# include  <ivl_target.h>
# include  "fpga_priv.h"


/* This is the opened xnf file descriptor. It is the output that this
   code generator writes to. */
FILE*xnf = 0;

const char*part = 0;
const char*arch = 0;
device_t device = 0;

static int show_process(ivl_process_t net, void*x)
{
      fprintf(stderr, "fpga target: unsynthesized behavioral code\n");
      return 0;
}

static void show_pads(ivl_scope_t scope)
{
      unsigned idx;

      if (device->show_pad == 0)
	    return;

      for (idx = 0 ;  idx < ivl_scope_sigs(scope) ;  idx += 1) {
	    ivl_signal_t sig = ivl_scope_sig(scope, idx);
	    const char*pad;

	    if (ivl_signal_port(sig) == IVL_SIP_NONE)
		  continue;

	    pad = ivl_signal_attr(sig, "PAD");
	    if (pad == 0)
		  continue;

	    device->show_pad(sig, pad);
      }
}

/*
 * This is the main entry point that ivl uses to invoke me, the code
 * generator.
 */
int target_design(ivl_design_t des)
{
      ivl_scope_t root = ivl_design_root(des);
      const char*path = ivl_design_flag(des, "-o");

      xnf = fopen(path, "w");
      if (xnf == 0) {
	    perror(path);
	    return -1;
      }

      part = ivl_design_flag(des, "part");
      if (part && (part[0] == 0))
	    part = 0;

      arch = ivl_design_flag(des, "arch");
      if (arch && (arch[0] == 0))
	    arch = 0;

      if (arch == 0)
	    arch = "generic-xnf";

      device = device_from_arch(arch);
      if (device == 0) {
	    fprintf(stderr, "Unknown architecture arch=%s\n", arch);
	    return -1;
      }

	/* Call the device driver to generate the netlist header. */
      device->show_header(des);

	/* Catch any behavioral code that is left, and write warnings
	   that it is not supported. */
      ivl_design_process(des, show_process, 0);

	/* Get the pads from the design, and draw them to connect to
	   the associated signals. */
      show_pads(root);

	/* Scan the scopes, looking for gates to draw into the output
	   netlist. */
      show_scope_gates(root, 0);

	/* Call the device driver to close out the file. */
      device->show_footer(des);

      fclose(xnf);
      xnf = 0;
      return 0;
}

/*
 * $Log: fpga.c,v $
 * Revision 1.5  2001/09/16 01:48:16  steve
 *  Suppor the PAD attribute on signals.
 *
 * Revision 1.4  2001/09/02 21:33:07  steve
 *  Rearrange the XNF code generator to be generic-xnf
 *  so that non-XNF code generation is also possible.
 *
 *  Start into the virtex EDIF output driver.
 *
 * Revision 1.3  2001/09/01 02:01:30  steve
 *  identity compare, and PWR records for constants.
 *
 * Revision 1.2  2001/08/31 02:59:06  steve
 *  Add root port SIG records.
 *
 * Revision 1.1  2001/08/28 04:14:20  steve
 *  Add the fpga target.
 *
 */