r4630 - in developers/werner: . dbgrst

[werner at docs.openmoko.org]

Author: werner
Date: 2008-09-05 14:52:35 +0200 (Fri, 05 Sep 2008)
New Revision: 4630

Added:
   developers/werner/dbgrst/
   developers/werner/dbgrst/Makefile
   developers/werner/dbgrst/README
   developers/werner/dbgrst/dbgrst.c
Log:
Small utility to reset a Neo through the debug board without using OpenOCD.



Added: developers/werner/dbgrst/Makefile
===================================================================
--- developers/werner/dbgrst/Makefile	                        (rev 0)
+++ developers/werner/dbgrst/Makefile	2008-09-05 12:52:35 UTC (rev 4630)
@@ -0,0 +1,20 @@
+CFLAGS=-Wall -I/usr/local/include
+LDFLAGS=-L/usr/local/lib -lftdi
+
+PREFIX=/usr
+
+.PHONY:		all install uninstall clean spotless
+
+all:		dbgrst
+
+install:
+		install -D dbgrst $(PREFIX)/bin/dbgrst
+
+uninstall:
+		rm -f $(PREFIX)/bin/dbgrst
+
+clean:
+		rm -f dbgrst.o
+
+spotless:	clean
+		rm -f dbgrst

Added: developers/werner/dbgrst/README
===================================================================
--- developers/werner/dbgrst/README	                        (rev 0)
+++ developers/werner/dbgrst/README	2008-09-05 12:52:35 UTC (rev 4630)
@@ -0,0 +1,13 @@
+dbgrst - Reset a Neo through the debug board
+============================================
+
+Usage:
+
+dbgrst
+
+  Pull nRESET low to reset the Neo.
+
+dbgrst performs the same function as OpenOCD "reset", except that it
+doesn't try to establish communication over JTAG and can therefore
+also operate when the JTAG interface is in a state that confuses
+OpenOCD.

Added: developers/werner/dbgrst/dbgrst.c
===================================================================
--- developers/werner/dbgrst/dbgrst.c	                        (rev 0)
+++ developers/werner/dbgrst/dbgrst.c	2008-09-05 12:52:35 UTC (rev 4630)
@@ -0,0 +1,115 @@
+/*
+ * dbgrst.c - Reset a Neo through the debug board
+ *
+ * Copyright (C) 2008 by OpenMoko, Inc.
+ * Written by Werner Almesberger <werner at openmoko.org>
+ * All Rights Reserved
+ *
+ * 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.
+ */
+
+
+#include <stdint.h>
+#include <stdlib.h>
+#include <stdio.h>
+#include <string.h>
+
+#include <ftdi.h>
+
+
+#define nTRST_ENABLE	0x1	/* ACBUS0/GPIOH0 */
+#define nTRST		0x2	/* ACBUS1/GPIOH1 */
+#define nSRST_ENABLE	0x4	/* ACBUS2/GPIOH2 */
+#define nSRST		0x8	/* ACBUS3/GPIOH3 */
+
+
+static const struct id {
+	uint16_t vendor;
+	uint16_t product;
+} ids[] = {
+	{ 0x0403, 0x6010 },	/* FTDI default IDs */
+	{ 0x1457, 0x5118 },	/* Neo1973 debug board (FIC) */
+	{ 0x1d50, 0x5118 },	/* Neo1973 debug board (OpenMoko) */
+	{ 0 }
+};
+
+
+static struct ftdi_context ftdi;
+
+
+static void open_ftdi(void)
+{
+	const struct id *id;
+
+	if (ftdi_init(&ftdi) < 0) {
+		fprintf(stderr, "ftdi_init failed\n");
+		exit(1);
+	}
+	for (id = ids; id->vendor; id++)
+		if (ftdi_usb_open(&ftdi, id->vendor, id->product) >= 0)
+			break;
+	if (!id->vendor) {
+		fprintf(stderr, "no debug board found\n");
+		exit(1);
+	}
+
+#if 0	/* not needed */
+	fprintf(stderr, "%04x:%04x\n", id->vendor, id->product);
+	ftdi_set_interface(&ftdi, INTERFACE_A);
+	ftdi_usb_reset(&ftdi);
+
+	ftdi_set_latency_timer(&ftdi, 2);
+#endif
+
+	if (ftdi_set_bitmode(&ftdi, 0x0b, BITMODE_MPSSE) < 0) {
+		fprintf(stderr, "ftdi_set_bitmode: %s\n",
+		    ftdi_get_error_string(&ftdi));
+		exit(1);
+	}
+}
+
+
+static void set_high(uint8_t data, uint8_t direction)
+{
+	uint8_t buf[3] = {
+		SET_BITS_HIGH,
+		data,
+		direction,
+	};
+
+	if (ftdi_write_data(&ftdi, buf, 3) < 0) {
+		fprintf(stderr, "ftdi_write_data: %s\n",
+		    ftdi_get_error_string(&ftdi));
+		exit(1);
+	}
+}
+
+
+static void pulse_reset(void)
+{
+	/*
+	 * We also have to make sure we don't assert nTRST.
+	 */
+	set_high(nTRST | nTRST_ENABLE, 0x0f);
+	set_high(nTRST | nTRST_ENABLE | nSRST | nSRST_ENABLE, 0x0f);
+}
+
+
+static void usage(const char *name)
+{
+	fprintf(stderr, "usage; %s\n", name);
+	exit(1);
+}
+
+
+int main(int argc, char **argv)
+{
+	if (argc != 1)
+		usage(*argv);
+	open_ftdi();
+	pulse_reset();
+	return 0;
+}