drivers/fpga/spartan3.c - github/trini/u-boot - Gitiles

 // SPDX-License-Identifier: GPL-2.0+
 /*
  * (C) Copyright 2002
  * Rich Ireland, Enterasys Networks, rireland@enterasys.com.
  */

 /*
  * Configuration support for Xilinx Spartan3 devices.  Based
  * on spartan2.c (Rich Ireland, rireland@enterasys.com).
  */

 #define LOG_CATEGORY UCLASS_FPGA

 #include <common.h>		/* core U-Boot definitions */
 #include <log.h>
 #include <spartan3.h>		/* Spartan-II device family */

 #undef CONFIG_SYS_FPGA_CHECK_BUSY

 /* Note: The assumption is that we cannot possibly run fast enough to
  * overrun the device (the Slave Parallel mode can free run at 50MHz).
  * If there is a need to operate slower, define CONFIG_FPGA_DELAY in
  * the board config file to slow things down.
  */
 #ifndef CONFIG_FPGA_DELAY
 #define CONFIG_FPGA_DELAY()
 #endif

 #ifndef CFG_SYS_FPGA_WAIT
 #define CFG_SYS_FPGA_WAIT CONFIG_SYS_HZ/100	/* 10 ms */
 #endif

 static int spartan3_sp_load(xilinx_desc *desc, const void *buf, size_t bsize);
 static int spartan3_sp_dump(xilinx_desc *desc, const void *buf, size_t bsize);
 /* static int spartan3_sp_info(xilinx_desc *desc ); */

 static int spartan3_ss_load(xilinx_desc *desc, const void *buf, size_t bsize);
 static int spartan3_ss_dump(xilinx_desc *desc, const void *buf, size_t bsize);
 /* static int spartan3_ss_info(xilinx_desc *desc); */

 /* ------------------------------------------------------------------------- */
 /* Spartan-II Generic Implementation */
 static int spartan3_load(xilinx_desc *desc, const void *buf, size_t bsize,
 			 bitstream_type bstype, int flags)
 {
 	int ret_val = FPGA_FAIL;

 	switch (desc->iface) {
 	case slave_serial:
 		log_debug("Launching Slave Serial Load\n");
 		ret_val = spartan3_ss_load(desc, buf, bsize);
 		break;

 	case slave_parallel:
 		log_debug("Launching Slave Parallel Load\n");
 		ret_val = spartan3_sp_load(desc, buf, bsize);
 		break;

 	default:
 		printf ("%s: Unsupported interface type, %d\n",
 				__FUNCTION__, desc->iface);
 	}

 	return ret_val;
 }

 static int spartan3_dump(xilinx_desc *desc, const void *buf, size_t bsize)
 {
 	int ret_val = FPGA_FAIL;

 	switch (desc->iface) {
 	case slave_serial:
 		log_debug("Launching Slave Serial Dump\n");
 		ret_val = spartan3_ss_dump(desc, buf, bsize);
 		break;

 	case slave_parallel:
 		log_debug("Launching Slave Parallel Dump\n");
 		ret_val = spartan3_sp_dump(desc, buf, bsize);
 		break;

 	default:
 		printf ("%s: Unsupported interface type, %d\n",
 				__FUNCTION__, desc->iface);
 	}

 	return ret_val;
 }

 static int spartan3_info(xilinx_desc *desc)
 {
 	return FPGA_SUCCESS;
 }


 /* ------------------------------------------------------------------------- */
 /* Spartan-II Slave Parallel Generic Implementation */

 static int spartan3_sp_load(xilinx_desc *desc, const void *buf, size_t bsize)
 {
 	int ret_val = FPGA_FAIL;	/* assume the worst */
 	xilinx_spartan3_slave_parallel_fns *fn = desc->iface_fns;

 	log_debug("start with interface functions @ 0x%p\n", fn);

 	if (fn) {
 		size_t bytecount = 0;
 		unsigned char *data = (unsigned char *) buf;
 		int cookie = desc->cookie;	/* make a local copy */
 		unsigned long ts;		/* timestamp */

 		log_debug("Function Table:\n"
 			  "ptr:\t0x%p\n"
 			  "struct: 0x%p\n"
 			  "pre: 0x%p\n"
 			  "pgm:\t0x%p\n"
 			  "init:\t0x%p\n"
 			  "err:\t0x%p\n"
 			  "clk:\t0x%p\n"
 			  "cs:\t0x%p\n"
 			  "wr:\t0x%p\n"
 			  "read data:\t0x%p\n"
 			  "write data:\t0x%p\n"
 			  "busy:\t0x%p\n"
 			  "abort:\t0x%p\n"
 			  "post:\t0x%p\n\n",
 			  &fn, fn, fn->pre, fn->pgm, fn->init, fn->err,
 			  fn->clk, fn->cs, fn->wr, fn->rdata, fn->wdata, fn->busy,
 			  fn->abort, fn->post);

 		/*
 		 * This code is designed to emulate the "Express Style"
 		 * Continuous Data Loading in Slave Parallel Mode for
 		 * the Spartan-II Family.
 		 */
 #ifdef CONFIG_SYS_FPGA_PROG_FEEDBACK
 		printf ("Loading FPGA Device %d...\n", cookie);
 #endif
 		/*
 		 * Run the pre configuration function if there is one.
 		 */
 		if (*fn->pre) {
 			(*fn->pre) (cookie);
 		}

 		/* Establish the initial state */
 		(*fn->pgm) (true, true, cookie);	/* Assert the program, commit */

 		/* Get ready for the burn */
 		CONFIG_FPGA_DELAY ();
 		(*fn->pgm) (false, true, cookie);	/* Deassert the program, commit */

 		ts = get_timer (0);		/* get current time */
 		/* Now wait for INIT and BUSY to go high */
 		do {
 			CONFIG_FPGA_DELAY ();
 			if (get_timer (ts) > CFG_SYS_FPGA_WAIT) {	/* check the time */
 				puts ("** Timeout waiting for INIT to clear.\n");
 				(*fn->abort) (cookie);	/* abort the burn */
 				return FPGA_FAIL;
 			}
 		} while ((*fn->init) (cookie) && (*fn->busy) (cookie));

 		(*fn->wr) (true, true, cookie); /* Assert write, commit */
 		(*fn->cs) (true, true, cookie); /* Assert chip select, commit */
 		(*fn->clk) (true, true, cookie);	/* Assert the clock pin */

 		/* Load the data */
 		while (bytecount < bsize) {
 			/* XXX - do we check for an Ctrl-C press in here ??? */
 			/* XXX - Check the error bit? */

 			(*fn->wdata) (data[bytecount++], true, cookie); /* write the data */
 			CONFIG_FPGA_DELAY ();
 			(*fn->clk) (false, true, cookie);	/* Deassert the clock pin */
 			CONFIG_FPGA_DELAY ();
 			(*fn->clk) (true, true, cookie);	/* Assert the clock pin */

 #ifdef CONFIG_SYS_FPGA_CHECK_BUSY
 			ts = get_timer (0);	/* get current time */
 			while ((*fn->busy) (cookie)) {
 				/* XXX - we should have a check in here somewhere to
 				 * make sure we aren't busy forever... */

 				CONFIG_FPGA_DELAY ();
 				(*fn->clk) (false, true, cookie);	/* Deassert the clock pin */
 				CONFIG_FPGA_DELAY ();
 				(*fn->clk) (true, true, cookie);	/* Assert the clock pin */

 				if (get_timer (ts) > CFG_SYS_FPGA_WAIT) {	/* check the time */
 					puts ("** Timeout waiting for BUSY to clear.\n");
 					(*fn->abort) (cookie);	/* abort the burn */
 					return FPGA_FAIL;
 				}
 			}
 #endif

 #ifdef CONFIG_SYS_FPGA_PROG_FEEDBACK
 			if (bytecount % (bsize / 40) == 0)
 				putc ('.');		/* let them know we are alive */
 #endif
 		}

 		CONFIG_FPGA_DELAY ();
 		(*fn->cs) (false, true, cookie);	/* Deassert the chip select */
 		(*fn->wr) (false, true, cookie);	/* Deassert the write pin */

 #ifdef CONFIG_SYS_FPGA_PROG_FEEDBACK
 		putc ('\n');			/* terminate the dotted line */
 #endif

 		/* now check for done signal */
 		ts = get_timer (0);		/* get current time */
 		ret_val = FPGA_SUCCESS;
 		while ((*fn->done) (cookie) == FPGA_FAIL) {
 			/* XXX - we should have a check in here somewhere to
 			 * make sure we aren't busy forever... */

 			CONFIG_FPGA_DELAY ();
 			(*fn->clk) (false, true, cookie);	/* Deassert the clock pin */
 			CONFIG_FPGA_DELAY ();
 			(*fn->clk) (true, true, cookie);	/* Assert the clock pin */

 			if (get_timer (ts) > CFG_SYS_FPGA_WAIT) {	/* check the time */
 				puts ("** Timeout waiting for DONE to clear.\n");
 				(*fn->abort) (cookie);	/* abort the burn */
 				ret_val = FPGA_FAIL;
 				break;
 			}
 		}

 		/*
 		 * Run the post configuration function if there is one.
 		 */
 		if (*fn->post)
 			(*fn->post) (cookie);

 #ifdef CONFIG_SYS_FPGA_PROG_FEEDBACK
 		if (ret_val == FPGA_SUCCESS)
 			puts ("Done.\n");
 		else
 			puts ("Fail.\n");
 #endif

 	} else {
 		printf ("%s: NULL Interface function table!\n", __FUNCTION__);
 	}

 	return ret_val;
 }

 static int spartan3_sp_dump(xilinx_desc *desc, const void *buf, size_t bsize)
 {
 	int ret_val = FPGA_FAIL;	/* assume the worst */
 	xilinx_spartan3_slave_parallel_fns *fn = desc->iface_fns;

 	if (fn) {
 		unsigned char *data = (unsigned char *) buf;
 		size_t bytecount = 0;
 		int cookie = desc->cookie;	/* make a local copy */

 		printf ("Starting Dump of FPGA Device %d...\n", cookie);

 		(*fn->cs) (true, true, cookie); /* Assert chip select, commit */
 		(*fn->clk) (true, true, cookie);	/* Assert the clock pin */

 		/* dump the data */
 		while (bytecount < bsize) {
 			/* XXX - do we check for an Ctrl-C press in here ??? */

 			(*fn->clk) (false, true, cookie);	/* Deassert the clock pin */
 			(*fn->clk) (true, true, cookie);	/* Assert the clock pin */
 			(*fn->rdata) (&(data[bytecount++]), cookie);	/* read the data */
 #ifdef CONFIG_SYS_FPGA_PROG_FEEDBACK
 			if (bytecount % (bsize / 40) == 0)
 				putc ('.');		/* let them know we are alive */
 #endif
 		}

 		(*fn->cs) (false, false, cookie);	/* Deassert the chip select */
 		(*fn->clk) (false, true, cookie);	/* Deassert the clock pin */
 		(*fn->clk) (true, true, cookie);	/* Assert the clock pin */

 #ifdef CONFIG_SYS_FPGA_PROG_FEEDBACK
 		putc ('\n');			/* terminate the dotted line */
 #endif
 		puts ("Done.\n");

 		/* XXX - checksum the data? */
 	} else {
 		printf ("%s: NULL Interface function table!\n", __FUNCTION__);
 	}

 	return ret_val;
 }


 /* ------------------------------------------------------------------------- */

 static int spartan3_ss_load(xilinx_desc *desc, const void *buf, size_t bsize)
 {
 	int ret_val = FPGA_FAIL;	/* assume the worst */
 	xilinx_spartan3_slave_serial_fns *fn = desc->iface_fns;
 	int i;
 	unsigned char val;

 	log_debug("start with interface functions @ 0x%p\n", fn);

 	if (fn) {
 		size_t bytecount = 0;
 		unsigned char *data = (unsigned char *) buf;
 		int cookie = desc->cookie;	/* make a local copy */
 		unsigned long ts;		/* timestamp */

 		log_debug("Function Table:\n"
 			  "ptr:\t0x%p\n"
 			  "struct: 0x%p\n"
 			  "pgm:\t0x%p\n"
 			  "init:\t0x%p\n"
 			  "clk:\t0x%p\n"
 			  "wr:\t0x%p\n"
 			  "done:\t0x%p\n\n",
 			  &fn, fn, fn->pgm, fn->init,
 			  fn->clk, fn->wr, fn->done);
 #ifdef CONFIG_SYS_FPGA_PROG_FEEDBACK
 		printf ("Loading FPGA Device %d...\n", cookie);
 #endif

 		/*
 		 * Run the pre configuration function if there is one.
 		 */
 		if (*fn->pre) {
 			(*fn->pre) (cookie);
 		}

 		/* Establish the initial state */
 		(*fn->pgm) (true, true, cookie);	/* Assert the program, commit */

 		/* Wait for INIT state (init low)                            */
 		ts = get_timer (0);		/* get current time */
 		do {
 			CONFIG_FPGA_DELAY ();
 			if (get_timer (ts) > CFG_SYS_FPGA_WAIT) {	/* check the time */
 				puts ("** Timeout waiting for INIT to start.\n");
 				if (*fn->abort)
 					(*fn->abort) (cookie);
 				return FPGA_FAIL;
 			}
 		} while (!(*fn->init) (cookie));

 		/* Get ready for the burn */
 		CONFIG_FPGA_DELAY ();
 		(*fn->pgm) (false, true, cookie);	/* Deassert the program, commit */

 		ts = get_timer (0);		/* get current time */
 		/* Now wait for INIT to go high */
 		do {
 			CONFIG_FPGA_DELAY ();
 			if (get_timer (ts) > CFG_SYS_FPGA_WAIT) {	/* check the time */
 				puts ("** Timeout waiting for INIT to clear.\n");
 				if (*fn->abort)
 					(*fn->abort) (cookie);
 				return FPGA_FAIL;
 			}
 		} while ((*fn->init) (cookie));

 		/* Load the data */
 		if(*fn->bwr)
 			(*fn->bwr) (data, bsize, true, cookie);
 		else {
 			while (bytecount < bsize) {

 				/* Xilinx detects an error if INIT goes low (active)
 				   while DONE is low (inactive) */
 				if ((*fn->done) (cookie) == 0 && (*fn->init) (cookie)) {
 					puts ("** CRC error during FPGA load.\n");
 					if (*fn->abort)
 						(*fn->abort) (cookie);
 					return (FPGA_FAIL);
 				}
 				val = data [bytecount ++];
 				i = 8;
 				do {
 					/* Deassert the clock */
 					(*fn->clk) (false, true, cookie);
 					CONFIG_FPGA_DELAY ();
 					/* Write data */
 					(*fn->wr) ((val & 0x80), true, cookie);
 					CONFIG_FPGA_DELAY ();
 					/* Assert the clock */
 					(*fn->clk) (true, true, cookie);
 					CONFIG_FPGA_DELAY ();
 					val <<= 1;
 					i --;
 				} while (i > 0);

 #ifdef CONFIG_SYS_FPGA_PROG_FEEDBACK
 				if (bytecount % (bsize / 40) == 0)
 					putc ('.');		/* let them know we are alive */
 #endif
 			}
 		}

 		CONFIG_FPGA_DELAY ();

 #ifdef CONFIG_SYS_FPGA_PROG_FEEDBACK
 		putc ('\n');			/* terminate the dotted line */
 #endif

 		/* now check for done signal */
 		ts = get_timer (0);		/* get current time */
 		ret_val = FPGA_SUCCESS;
 		(*fn->wr) (true, true, cookie);

 		while (! (*fn->done) (cookie)) {
 			/* XXX - we should have a check in here somewhere to
 			 * make sure we aren't busy forever... */

 			CONFIG_FPGA_DELAY ();
 			(*fn->clk) (false, true, cookie);	/* Deassert the clock pin */
 			CONFIG_FPGA_DELAY ();
 			(*fn->clk) (true, true, cookie);	/* Assert the clock pin */

 			putc ('*');

 			if (get_timer (ts) > CFG_SYS_FPGA_WAIT) {	/* check the time */
 				puts ("** Timeout waiting for DONE to clear.\n");
 				ret_val = FPGA_FAIL;
 				break;
 			}
 		}
 		putc ('\n');			/* terminate the dotted line */

 		/*
 		 * Run the post configuration function if there is one.
 		 */
 		if (*fn->post)
 			(*fn->post) (cookie);

 #ifdef CONFIG_SYS_FPGA_PROG_FEEDBACK
 		if (ret_val == FPGA_SUCCESS)
 			puts ("Done.\n");
 		else
 			puts ("Fail.\n");
 #endif

 	} else {
 		printf ("%s: NULL Interface function table!\n", __FUNCTION__);
 	}

 	return ret_val;
 }

 static int spartan3_ss_dump(xilinx_desc *desc, const void *buf, size_t bsize)
 {
 	/* Readback is only available through the Slave Parallel and         */
 	/* boundary-scan interfaces.                                         */
 	printf ("%s: Slave Serial Dumping is unavailable\n",
 			__FUNCTION__);
 	return FPGA_FAIL;
 }

 struct xilinx_fpga_op spartan3_op = {
 	.load = spartan3_load,
 	.dump = spartan3_dump,
 	.info = spartan3_info,
 };
	// SPDX-License-Identifier: GPL-2.0+
	/*
	* (C) Copyright 2002
	* Rich Ireland, Enterasys Networks, rireland@enterasys.com.
	*/

	/*
	* Configuration support for Xilinx Spartan3 devices. Based
	* on spartan2.c (Rich Ireland, rireland@enterasys.com).
	*/

	#define LOG_CATEGORY UCLASS_FPGA

	#include <common.h> /* core U-Boot definitions */
	#include <log.h>
	#include <spartan3.h> /* Spartan-II device family */

	#undef CONFIG_SYS_FPGA_CHECK_BUSY

	/* Note: The assumption is that we cannot possibly run fast enough to
	* overrun the device (the Slave Parallel mode can free run at 50MHz).
	* If there is a need to operate slower, define CONFIG_FPGA_DELAY in
	* the board config file to slow things down.
	*/
	#ifndef CONFIG_FPGA_DELAY
	#define CONFIG_FPGA_DELAY()
	#endif

	#ifndef CFG_SYS_FPGA_WAIT
	#define CFG_SYS_FPGA_WAIT CONFIG_SYS_HZ/100 /* 10 ms */
	#endif

	static int spartan3_sp_load(xilinx_desc desc, const void buf, size_t bsize);
	static int spartan3_sp_dump(xilinx_desc desc, const void buf, size_t bsize);
	/* static int spartan3_sp_info(xilinx_desc desc ); /

	static int spartan3_ss_load(xilinx_desc desc, const void buf, size_t bsize);
	static int spartan3_ss_dump(xilinx_desc desc, const void buf, size_t bsize);
	/* static int spartan3_ss_info(xilinx_desc desc); /

	/* ------------------------------------------------------------------------- */
	/* Spartan-II Generic Implementation */
	static int spartan3_load(xilinx_desc desc, const void buf, size_t bsize,
	bitstream_type bstype, int flags)
	{
	int ret_val = FPGA_FAIL;

	switch (desc->iface) {
	case slave_serial:
	log_debug("Launching Slave Serial Load\n");
	ret_val = spartan3_ss_load(desc, buf, bsize);
	break;

	case slave_parallel:
	log_debug("Launching Slave Parallel Load\n");
	ret_val = spartan3_sp_load(desc, buf, bsize);
	break;

	default:
	printf ("%s: Unsupported interface type, %d\n",
	__FUNCTION__, desc->iface);
	}

	return ret_val;
	}

	static int spartan3_dump(xilinx_desc desc, const void buf, size_t bsize)
	{
	int ret_val = FPGA_FAIL;

	switch (desc->iface) {
	case slave_serial:
	log_debug("Launching Slave Serial Dump\n");
	ret_val = spartan3_ss_dump(desc, buf, bsize);
	break;

	case slave_parallel:
	log_debug("Launching Slave Parallel Dump\n");
	ret_val = spartan3_sp_dump(desc, buf, bsize);
	break;

	default:
	printf ("%s: Unsupported interface type, %d\n",
	__FUNCTION__, desc->iface);
	}

	return ret_val;
	}

	static int spartan3_info(xilinx_desc *desc)
	{
	return FPGA_SUCCESS;
	}


	/* ------------------------------------------------------------------------- */
	/* Spartan-II Slave Parallel Generic Implementation */

	static int spartan3_sp_load(xilinx_desc desc, const void buf, size_t bsize)
	{
	int ret_val = FPGA_FAIL; /* assume the worst */
	xilinx_spartan3_slave_parallel_fns *fn = desc->iface_fns;

	log_debug("start with interface functions @ 0x%p\n", fn);

	if (fn) {
	size_t bytecount = 0;
	unsigned char data = (unsigned char ) buf;
	int cookie = desc->cookie; /* make a local copy */
	unsigned long ts; /* timestamp */

	log_debug("Function Table:\n"
	"ptr:\t0x%p\n"
	"struct: 0x%p\n"
	"pre: 0x%p\n"
	"pgm:\t0x%p\n"
	"init:\t0x%p\n"
	"err:\t0x%p\n"
	"clk:\t0x%p\n"
	"cs:\t0x%p\n"
	"wr:\t0x%p\n"
	"read data:\t0x%p\n"
	"write data:\t0x%p\n"
	"busy:\t0x%p\n"
	"abort:\t0x%p\n"
	"post:\t0x%p\n\n",
	&fn, fn, fn->pre, fn->pgm, fn->init, fn->err,
	fn->clk, fn->cs, fn->wr, fn->rdata, fn->wdata, fn->busy,
	fn->abort, fn->post);

	/*
	* This code is designed to emulate the "Express Style"
	* Continuous Data Loading in Slave Parallel Mode for
	* the Spartan-II Family.
	*/
	#ifdef CONFIG_SYS_FPGA_PROG_FEEDBACK
	printf ("Loading FPGA Device %d...\n", cookie);
	#endif
	/*
	* Run the pre configuration function if there is one.
	*/
	if (*fn->pre) {
	(*fn->pre) (cookie);
	}

	/* Establish the initial state */
	(fn->pgm) (true, true, cookie); / Assert the program, commit */

	/* Get ready for the burn */
	CONFIG_FPGA_DELAY ();
	(fn->pgm) (false, true, cookie); / Deassert the program, commit */

	ts = get_timer (0); /* get current time */
	/* Now wait for INIT and BUSY to go high */
	do {
	CONFIG_FPGA_DELAY ();
	if (get_timer (ts) > CFG_SYS_FPGA_WAIT) { /* check the time */
	puts ("** Timeout waiting for INIT to clear.\n");
	(fn->abort) (cookie); / abort the burn */
	return FPGA_FAIL;
	}
	} while ((fn->init) (cookie) && (fn->busy) (cookie));

	(fn->wr) (true, true, cookie); / Assert write, commit */
	(fn->cs) (true, true, cookie); / Assert chip select, commit */
	(fn->clk) (true, true, cookie); / Assert the clock pin */

	/* Load the data */
	while (bytecount < bsize) {
	/* XXX - do we check for an Ctrl-C press in here ??? */
	/* XXX - Check the error bit? */

	(fn->wdata) (data[bytecount++], true, cookie); / write the data */
	CONFIG_FPGA_DELAY ();
	(fn->clk) (false, true, cookie); / Deassert the clock pin */
	CONFIG_FPGA_DELAY ();
	(fn->clk) (true, true, cookie); / Assert the clock pin */

	#ifdef CONFIG_SYS_FPGA_CHECK_BUSY
	ts = get_timer (0); /* get current time */
	while ((*fn->busy) (cookie)) {
	/* XXX - we should have a check in here somewhere to
	* make sure we aren't busy forever... */

	CONFIG_FPGA_DELAY ();
	(fn->clk) (false, true, cookie); / Deassert the clock pin */
	CONFIG_FPGA_DELAY ();
	(fn->clk) (true, true, cookie); / Assert the clock pin */

	if (get_timer (ts) > CFG_SYS_FPGA_WAIT) { /* check the time */
	puts ("** Timeout waiting for BUSY to clear.\n");
	(fn->abort) (cookie); / abort the burn */
	return FPGA_FAIL;
	}
	}
	#endif

	#ifdef CONFIG_SYS_FPGA_PROG_FEEDBACK
	if (bytecount % (bsize / 40) == 0)
	putc ('.'); /* let them know we are alive */
	#endif
	}

	CONFIG_FPGA_DELAY ();
	(fn->cs) (false, true, cookie); / Deassert the chip select */
	(fn->wr) (false, true, cookie); / Deassert the write pin */

	#ifdef CONFIG_SYS_FPGA_PROG_FEEDBACK
	putc ('\n'); /* terminate the dotted line */
	#endif

	/* now check for done signal */
	ts = get_timer (0); /* get current time */
	ret_val = FPGA_SUCCESS;
	while ((*fn->done) (cookie) == FPGA_FAIL) {
	/* XXX - we should have a check in here somewhere to
	* make sure we aren't busy forever... */

	CONFIG_FPGA_DELAY ();
	(fn->clk) (false, true, cookie); / Deassert the clock pin */
	CONFIG_FPGA_DELAY ();
	(fn->clk) (true, true, cookie); / Assert the clock pin */

	if (get_timer (ts) > CFG_SYS_FPGA_WAIT) { /* check the time */
	puts ("** Timeout waiting for DONE to clear.\n");
	(fn->abort) (cookie); / abort the burn */
	ret_val = FPGA_FAIL;
	break;
	}
	}

	/*
	* Run the post configuration function if there is one.
	*/
	if (*fn->post)
	(*fn->post) (cookie);

	#ifdef CONFIG_SYS_FPGA_PROG_FEEDBACK
	if (ret_val == FPGA_SUCCESS)
	puts ("Done.\n");
	else
	puts ("Fail.\n");
	#endif

	} else {
	printf ("%s: NULL Interface function table!\n", __FUNCTION__);
	}

	return ret_val;
	}

	static int spartan3_sp_dump(xilinx_desc desc, const void buf, size_t bsize)
	{
	int ret_val = FPGA_FAIL; /* assume the worst */
	xilinx_spartan3_slave_parallel_fns *fn = desc->iface_fns;

	if (fn) {
	unsigned char data = (unsigned char ) buf;
	size_t bytecount = 0;
	int cookie = desc->cookie; /* make a local copy */

	printf ("Starting Dump of FPGA Device %d...\n", cookie);

	(fn->cs) (true, true, cookie); / Assert chip select, commit */
	(fn->clk) (true, true, cookie); / Assert the clock pin */

	/* dump the data */
	while (bytecount < bsize) {
	/* XXX - do we check for an Ctrl-C press in here ??? */

	(fn->clk) (false, true, cookie); / Deassert the clock pin */
	(fn->clk) (true, true, cookie); / Assert the clock pin */
	(fn->rdata) (&(data[bytecount++]), cookie); / read the data */
	#ifdef CONFIG_SYS_FPGA_PROG_FEEDBACK
	if (bytecount % (bsize / 40) == 0)
	putc ('.'); /* let them know we are alive */
	#endif
	}

	(fn->cs) (false, false, cookie); / Deassert the chip select */
	(fn->clk) (false, true, cookie); / Deassert the clock pin */
	(fn->clk) (true, true, cookie); / Assert the clock pin */

	#ifdef CONFIG_SYS_FPGA_PROG_FEEDBACK
	putc ('\n'); /* terminate the dotted line */
	#endif
	puts ("Done.\n");

	/* XXX - checksum the data? */
	} else {
	printf ("%s: NULL Interface function table!\n", __FUNCTION__);
	}

	return ret_val;
	}


	/* ------------------------------------------------------------------------- */

	static int spartan3_ss_load(xilinx_desc desc, const void buf, size_t bsize)
	{
	int ret_val = FPGA_FAIL; /* assume the worst */
	xilinx_spartan3_slave_serial_fns *fn = desc->iface_fns;
	int i;
	unsigned char val;

	log_debug("start with interface functions @ 0x%p\n", fn);

	if (fn) {
	size_t bytecount = 0;
	unsigned char data = (unsigned char ) buf;
	int cookie = desc->cookie; /* make a local copy */
	unsigned long ts; /* timestamp */

	log_debug("Function Table:\n"
	"ptr:\t0x%p\n"
	"struct: 0x%p\n"
	"pgm:\t0x%p\n"
	"init:\t0x%p\n"
	"clk:\t0x%p\n"
	"wr:\t0x%p\n"
	"done:\t0x%p\n\n",
	&fn, fn, fn->pgm, fn->init,
	fn->clk, fn->wr, fn->done);
	#ifdef CONFIG_SYS_FPGA_PROG_FEEDBACK
	printf ("Loading FPGA Device %d...\n", cookie);
	#endif

	/*
	* Run the pre configuration function if there is one.
	*/
	if (*fn->pre) {
	(*fn->pre) (cookie);
	}

	/* Establish the initial state */
	(fn->pgm) (true, true, cookie); / Assert the program, commit */

	/* Wait for INIT state (init low) */
	ts = get_timer (0); /* get current time */
	do {
	CONFIG_FPGA_DELAY ();
	if (get_timer (ts) > CFG_SYS_FPGA_WAIT) { /* check the time */
	puts ("** Timeout waiting for INIT to start.\n");
	if (*fn->abort)
	(*fn->abort) (cookie);
	return FPGA_FAIL;
	}
	} while (!(*fn->init) (cookie));

	/* Get ready for the burn */
	CONFIG_FPGA_DELAY ();
	(fn->pgm) (false, true, cookie); / Deassert the program, commit */

	ts = get_timer (0); /* get current time */
	/* Now wait for INIT to go high */
	do {
	CONFIG_FPGA_DELAY ();
	if (get_timer (ts) > CFG_SYS_FPGA_WAIT) { /* check the time */
	puts ("** Timeout waiting for INIT to clear.\n");
	if (*fn->abort)
	(*fn->abort) (cookie);
	return FPGA_FAIL;
	}
	} while ((*fn->init) (cookie));

	/* Load the data */
	if(*fn->bwr)
	(*fn->bwr) (data, bsize, true, cookie);
	else {
	while (bytecount < bsize) {

	/* Xilinx detects an error if INIT goes low (active)
	while DONE is low (inactive) */
	if ((fn->done) (cookie) == 0 && (fn->init) (cookie)) {
	puts ("** CRC error during FPGA load.\n");
	if (*fn->abort)
	(*fn->abort) (cookie);
	return (FPGA_FAIL);
	}
	val = data [bytecount ++];
	i = 8;
	do {
	/* Deassert the clock */
	(*fn->clk) (false, true, cookie);
	CONFIG_FPGA_DELAY ();
	/* Write data */
	(*fn->wr) ((val & 0x80), true, cookie);
	CONFIG_FPGA_DELAY ();
	/* Assert the clock */
	(*fn->clk) (true, true, cookie);
	CONFIG_FPGA_DELAY ();
	val <<= 1;
	i --;
	} while (i > 0);

	#ifdef CONFIG_SYS_FPGA_PROG_FEEDBACK
	if (bytecount % (bsize / 40) == 0)
	putc ('.'); /* let them know we are alive */
	#endif
	}
	}

	CONFIG_FPGA_DELAY ();

	#ifdef CONFIG_SYS_FPGA_PROG_FEEDBACK
	putc ('\n'); /* terminate the dotted line */
	#endif

	/* now check for done signal */
	ts = get_timer (0); /* get current time */
	ret_val = FPGA_SUCCESS;
	(*fn->wr) (true, true, cookie);

	while (! (*fn->done) (cookie)) {
	/* XXX - we should have a check in here somewhere to
	* make sure we aren't busy forever... */

	CONFIG_FPGA_DELAY ();
	(fn->clk) (false, true, cookie); / Deassert the clock pin */
	CONFIG_FPGA_DELAY ();
	(fn->clk) (true, true, cookie); / Assert the clock pin */

	putc ('*');

	if (get_timer (ts) > CFG_SYS_FPGA_WAIT) { /* check the time */
	puts ("** Timeout waiting for DONE to clear.\n");
	ret_val = FPGA_FAIL;
	break;
	}
	}
	putc ('\n'); /* terminate the dotted line */

	/*
	* Run the post configuration function if there is one.
	*/
	if (*fn->post)
	(*fn->post) (cookie);

	#ifdef CONFIG_SYS_FPGA_PROG_FEEDBACK
	if (ret_val == FPGA_SUCCESS)
	puts ("Done.\n");
	else
	puts ("Fail.\n");
	#endif

	} else {
	printf ("%s: NULL Interface function table!\n", __FUNCTION__);
	}

	return ret_val;
	}

	static int spartan3_ss_dump(xilinx_desc desc, const void buf, size_t bsize)
	{
	/* Readback is only available through the Slave Parallel and */
	/* boundary-scan interfaces. */
	printf ("%s: Slave Serial Dumping is unavailable\n",
	__FUNCTION__);
	return FPGA_FAIL;
	}

	struct xilinx_fpga_op spartan3_op = {
	.load = spartan3_load,
	.dump = spartan3_dump,
	.info = spartan3_info,
	};