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1 files changed, 401 insertions, 0 deletions

diff --git a/board/gen860t/fpga.c b/board/gen860t/fpga.c
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+/*
+ * (C) Copyright 2002
+ * Rich Ireland, Enterasys Networks, rireland@enterasys.com.
+ * Keith Outwater, keith_outwater@mvis.com.
+ *
+ * See file CREDITS for list of people who contributed to this
+ * project.
+ *
+ * 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., 59 Temple Place, Suite 330, Boston,
+ * MA 02111-1307 USA
+ *
+ */
+
+/*
+ * Virtex2 FPGA configuration support for the GEN860T computer
+ */
+
+#include <common.h>
+#include <virtex2.h>
+#include <command.h>
+#include "fpga.h"
+
+#if (CONFIG_FPGA)
+
+#if 0
+#define GEN860T_FPGA_DEBUG
+#endif
+
+#ifdef GEN860T_FPGA_DEBUG
+#define	PRINTF(fmt,args...)	printf (fmt ,##args)
+#else
+#define	PRINTF(fmt,args...)
+#endif
+
+/*
+ * Port bit numbers for the Selectmap controls
+ */
+#define FPGA_INIT_BIT_NUM		22	/* PB22 */
+#define FPGA_RESET_BIT_NUM		11	/* PC11 */
+#define FPGA_DONE_BIT_NUM		16	/* PB16 */
+#define FPGA_PROGRAM_BIT_NUM	7	/* PA7  */
+
+/* Note that these are pointers to code that is in Flash.  They will be
+ * relocated at runtime.
+ */
+Xilinx_Virtex2_Slave_SelectMap_fns fpga_fns = {
+	fpga_pre_config_fn,
+	fpga_pgm_fn,
+	fpga_init_fn,
+	fpga_err_fn,
+	fpga_done_fn,
+	fpga_clk_fn,
+	fpga_cs_fn,
+	fpga_wr_fn,
+	fpga_read_data_fn,
+	fpga_write_data_fn,
+	fpga_busy_fn,
+	fpga_abort_fn,
+	fpga_post_config_fn
+};
+
+Xilinx_desc fpga[CONFIG_FPGA_COUNT] = {
+	{ Xilinx_Virtex2,
+	  slave_selectmap,
+	  XILINX_XC2V3000_SIZE,
+	  (void *)&fpga_fns,
+	  0
+	}
+};
+
+/*
+ * Display FPGA revision information
+ */
+void
+print_fpga_revision(void)
+{
+	vu_long *rev_p = (vu_long *)0x60000008;
+
+	printf("FPGA Revision 0x%.8lx"
+		   " (Date %.2lx/%.2lx/%.2lx, Status \"%.1lx\", Version %.3lu)\n",
+		   *rev_p,
+		   ((*rev_p >> 28) & 0xf),
+		   ((*rev_p >> 20) & 0xff),
+		   ((*rev_p >> 12) & 0xff),
+		   ((*rev_p >> 8) & 0xf),
+		   (*rev_p & 0xff));
+}
+
+
+/*
+ * Perform a simple test of the FPGA to processor interface using the FPGA's
+ * inverting bus test register.  The great thing about doing a read/write
+ * test on a register that inverts it's contents is that you avoid any
+ * problems with bus charging.
+ * Return 0 on failure, 1 on success.
+ */
+int
+test_fpga_ibtr(void)
+{
+	vu_long *ibtr_p = (vu_long *)0x60000010;
+	vu_long readback;
+	vu_long compare;
+	int i;
+	int j;
+	int k;
+	int pass = 1;
+
+	static const ulong bitpattern[] = {
+		0xdeadbeef,	/* magic ID pattern for debug	*/
+		0x00000001,	/* single bit					*/
+		0x00000003,	/* two adjacent bits			*/
+		0x00000007,	/* three adjacent bits			*/
+		0x0000000F,	/* four adjacent bits			*/
+		0x00000005,	/* two non-adjacent bits		*/
+		0x00000015,	/* three non-adjacent bits		*/
+		0x00000055,	/* four non-adjacent bits		*/
+		0xaaaaaaaa,	/* alternating 1/0				*/
+	};
+
+	for (i = 0; i < 1024; i++) {
+		for (j = 0; j < 31; j++) {
+			for (k = 0; k < sizeof(bitpattern)/sizeof(bitpattern[0]); k++) {
+				*ibtr_p = compare = (bitpattern[k] << j);
+				readback = *ibtr_p;
+				if (readback != ~compare) {
+					printf("%s:%d: FPGA test fail: expected 0x%.8lx"
+						   " actual 0x%.8lx\n",
+						   __FUNCTION__, __LINE__, ~compare, readback);
+					pass = 0;
+					break;
+				}
+			}
+			if (!pass) break;
+		}
+		if (!pass) break;
+	}
+	if (pass) {
+		printf("FPGA inverting bus test passed\n");
+		print_fpga_revision();
+	}
+	else {
+		printf("** FPGA inverting bus test failed\n");
+	}
+	return pass;
+}
+
+
+/*
+ * Set the active-low FPGA reset signal.
+ */
+void
+fpga_reset(int assert)
+{
+    volatile immap_t *immap  = (immap_t *)CFG_IMMR;
+
+	PRINTF("%s:%d: RESET ", __FUNCTION__, __LINE__);
+	if (assert) {
+		immap->im_ioport.iop_pcdat &= ~(0x8000 >> FPGA_RESET_BIT_NUM);
+		PRINTF("asserted\n");
+	}
+	else {
+		immap->im_ioport.iop_pcdat |= (0x8000 >> FPGA_RESET_BIT_NUM);
+		PRINTF("deasserted\n");
+	}
+}
+
+
+/*
+ * Initialize the SelectMap interface.  We assume that the mode and the
+ * initial state of all of the port pins have already been set!
+ */
+void
+fpga_selectmap_init(void)
+{
+	PRINTF("%s:%d: Initialize SelectMap interface\n", __FUNCTION__, __LINE__);
+	fpga_pgm_fn(FALSE, FALSE, 0);   /* make sure program pin is inactive */
+}
+
+
+/*
+ * Initialize the fpga.  Return 1 on success, 0 on failure.
+ */
+int
+gen860t_init_fpga(void)
+{
+	DECLARE_GLOBAL_DATA_PTR;
+
+	int i;
+
+	PRINTF("%s:%d: Initialize FPGA interface (relocation offset = 0x%.8lx)\n",
+			__FUNCTION__, __LINE__, gd->reloc_off);
+	fpga_init(gd->reloc_off);
+	fpga_selectmap_init();
+
+	for(i=0; i < CONFIG_FPGA_COUNT; i++) {
+		PRINTF("%s:%d: Adding fpga %d\n", __FUNCTION__, __LINE__, i);
+		fpga_add(fpga_xilinx, &fpga[i]);
+	}
+ 	return 1;
+}
+
+
+/*
+ * Set the FPGA's active-low SelectMap program line to the specified level
+ */
+int
+fpga_pgm_fn(int assert, int flush, int cookie)
+{
+    volatile immap_t *immap  = (immap_t *)CFG_IMMR;
+
+	PRINTF("%s:%d: FPGA PROGRAM ", __FUNCTION__, __LINE__);
+
+	if (assert) {
+		immap->im_ioport.iop_padat &= ~(0x8000 >> FPGA_PROGRAM_BIT_NUM);
+		PRINTF("asserted\n");
+	}
+	else {
+		immap->im_ioport.iop_padat |= (0x8000 >> FPGA_PROGRAM_BIT_NUM);
+		PRINTF("deasserted\n");
+	}
+	return assert;
+}
+
+
+/*
+ * Test the state of the active-low FPGA INIT line.  Return 1 on INIT
+ * asserted (low).
+ */
+int
+fpga_init_fn(int cookie)
+{
+    volatile immap_t *immap  = (immap_t *)CFG_IMMR;
+
+	PRINTF("%s:%d: INIT check... ", __FUNCTION__, __LINE__);
+	if(immap->im_cpm.cp_pbdat & (0x80000000 >> FPGA_INIT_BIT_NUM)) {
+		PRINTF("high\n");
+		return 0;
+	}
+	else {
+		PRINTF("low\n");
+		return 1;
+	}
+}
+
+
+/*
+ * Test the state of the active-high FPGA DONE pin
+ */
+int
+fpga_done_fn(int cookie)
+{
+    volatile immap_t *immap  = (immap_t *)CFG_IMMR;
+
+	PRINTF("%s:%d: DONE check... ", __FUNCTION__, __LINE__);
+	if (immap->im_cpm.cp_pbdat & (0x80000000 >> FPGA_DONE_BIT_NUM)) {
+		PRINTF("high\n");
+		return FPGA_SUCCESS;
+	}
+	else {
+		PRINTF("low\n");
+		return FPGA_FAIL;
+	}
+}
+
+
+/*
+ * Read FPGA SelectMap data.
+ */
+int
+fpga_read_data_fn(unsigned char *data, int cookie)
+{
+	vu_char *p = (vu_char *)SELECTMAP_BASE;
+
+	*data = *p;
+#if 0
+	PRINTF("%s: Read 0x%x into 0x%p\n", __FUNCTION__, (int)data, data);
+#endif
+	return (int)data;
+}
+
+
+/*
+ * Write data to the FPGA SelectMap port
+ */
+int
+fpga_write_data_fn(unsigned char data, int flush, int cookie)
+{
+	vu_char *p = (vu_char *)SELECTMAP_BASE;
+
+#if 0
+	PRINTF("%s: Write Data 0x%x\n", __FUNCTION__, (int)data);
+#endif
+	*p = data;
+	return (int)data;
+}
+
+
+/*
+ * Abort and FPGA operation
+ */
+int
+fpga_abort_fn(int cookie)
+{
+	PRINTF("%s:%d: FPGA program sequence aborted\n",
+		   __FUNCTION__, __LINE__);
+	return FPGA_FAIL;
+}
+
+
+/*
+ * FPGA pre-configuration function. Just make sure that
+ * FPGA reset is asserted to keep the FPGA from starting up after
+ * configuration.
+ */
+int
+fpga_pre_config_fn(int cookie)
+{
+	PRINTF("%s:%d: FPGA pre-configuration\n", __FUNCTION__, __LINE__);
+	fpga_reset(TRUE);
+	return 0;
+}
+
+
+/*
+ * FPGA post configuration function. Blip the FPGA reset line and then see if
+ * the FPGA appears to be running.
+ */
+int
+fpga_post_config_fn(int cookie)
+{
+	int rc;
+
+	PRINTF("%s:%d: FPGA post configuration\n", __FUNCTION__, __LINE__);
+	fpga_reset(TRUE);
+	udelay(1000);
+	fpga_reset(FALSE);
+	udelay (1000);
+
+	/*
+	 * Use the FPGA,s inverting bus test register to do a simple test of the
+	 * processor interface.
+	 */
+	rc = test_fpga_ibtr();
+	return rc;
+}
+
+
+/*
+ * Clock, chip select and write signal assert functions and error check
+ * and busy functions.  These are only stubs because the GEN860T selectmap
+ * interface handles sequencing of control signals automatically (it uses
+ * a memory-mapped interface to the FPGA SelectMap port).  The design of
+ * the interface guarantees that the SelectMap port cannot be overrun so
+ * no busy check is needed.  A configuration error is signalled by INIT
+ * going low during configuration, so there is no need for a separate error
+ * function.
+ */
+int
+fpga_clk_fn(int assert_clk, int flush, int cookie)
+{
+	return assert_clk;
+}
+
+int
+fpga_cs_fn(int assert_cs, int flush, int cookie)
+{
+	return assert_cs;
+}
+
+int
+fpga_wr_fn(int assert_write, int flush, int cookie)
+{
+	return assert_write;
+}
+
+int
+fpga_err_fn(int cookie)
+{
+	return 0;
+}
+
+int
+fpga_busy_fn(int cookie)
+{
+	return 0;
+}
+#endif
+
+/* vim: set ts=4 tw=78 sw=4: */