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-rw-r--r--utils/eim_peek_poke.c121
1 files changed, 121 insertions, 0 deletions
diff --git a/utils/eim_peek_poke.c b/utils/eim_peek_poke.c
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+++ b/utils/eim_peek_poke.c
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+/*
+ * eim_peek_poke.c
+ * ---------------
+ * Read or write a 32-bit word via the EIM bus. This is mostly
+ * intended for use as part of the FPGA initialization sequence.
+ *
+ * Authors: Paul Selkirk, Rob Austein
+ * Copyright (c) 2015, SUNET
+ *
+ * Redistribution and use in source and binary forms, with or
+ * without modification, are permitted provided that the following
+ * conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in
+ * the documentation and/or other materials provided with the
+ * distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+ * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+ * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
+ * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
+ * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <stdarg.h>
+#include <string.h>
+
+#include "novena-eim.h"
+
+static int string_match(const char *s1, ...)
+{
+ const char *s2;
+
+ if (s1 == NULL)
+ return 0;
+
+ va_list ap;
+ va_start(ap, s1);
+ for (s2 = va_arg(ap, const char *); s2 != NULL; s2 = va_arg(ap, const char *))
+ if (!strcmp(s1, s2))
+ break;
+ va_end(ap);
+
+ return s2 != NULL;
+}
+
+static int parse_value(const char *s, uint32_t *value)
+{
+ if (s == NULL || value == NULL)
+ return 0;
+
+ char *e;
+ *value = strtoul(s, &e, 0);
+
+ return *s != '\0' && *e == '\0';
+}
+
+static int parse_offset(const char *s, off_t *offset)
+{
+ uint32_t value;
+
+ if (offset == NULL || !parse_value(s, &value))
+ return 0;
+
+ *offset = (off_t) value;
+ return 1;
+}
+
+static void usage(const int code, const char *jane)
+{
+ FILE *f = code ? stderr : stdout;
+ fprintf(f, "usage: %s { --read offset | --write offset value }\n", jane);
+ exit(code);
+}
+
+int main(int argc, char *argv[])
+{
+ off_t offset = 0;
+ uint32_t value;
+
+ if (argc == 1 || string_match(argv[1], "-?", "-h", "--help"))
+ usage(EXIT_SUCCESS, argv[0]);
+
+ if (eim_setup() != 0) {
+ fprintf(stderr, "EIM setup failed\n");
+ return EXIT_FAILURE;
+ }
+
+ if (string_match(argv[1], "r", "-r", "--read", "--peek")) {
+ if (argc != 3 || !parse_offset(argv[2], &offset))
+ usage(EXIT_FAILURE, argv[0]);
+ eim_read_32(offset, &value);
+ printf("%08x\n", value);
+ }
+
+ else if (string_match(argv[1], "w", "-w", "--write", "--poke")) {
+ if (argc != 4 || !parse_offset(argv[2], &offset) || !parse_value(argv[3], &value))
+ usage(EXIT_FAILURE, argv[0]);
+ eim_write_32(offset, &value);
+ exit(EXIT_SUCCESS);
+ }
+
+ else {
+ usage(EXIT_FAILURE, argv[0]);
+ }
+
+ return EXIT_SUCCESS;
+}