Add register writing tool

Signed-off-by: Eric Anholt <eric@anholt.net>

1 files changed, 57 insertions, 0 deletions

diff --git a/tools/intel_reg_write.c b/tools/intel_reg_write.c
new file mode 100644
index 00000000..7bed0623
--- /dev/null
+++ b/tools/intel_reg_write.c
@@ -0,0 +1,57 @@
+/*
+ * Copyright © 2007 Intel Corporation
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the next
+ * paragraph) shall be included in all copies or substantial portions of the
+ * Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+ * DEALINGS IN THE SOFTWARE.
+ *
+ * Authors:
+ *    Ben Gamari <bgamari.foss@gmail.com>
+ *
+ */
+
+#include <unistd.h>
+#include <stdlib.h>
+#include <stdio.h>
+#include <err.h>
+#include "intel_gpu_tools.h"
+
+int main(int argc, char** argv)
+{
+	uint32_t reg, value;
+	volatile uint32_t *ptr;
+
+	if (argc < 3) {
+		printf("Usage: %s addr value\n", argv[0]);
+		printf("  WARNING: This is dangerous to you and your system's health.\n");
+		printf("           Only for use in debugging.\n");
+		exit(1);
+	}
+
+	intel_get_mmio();
+	sscanf(argv[1], "0x%x", &reg);
+	sscanf(argv[2], "0x%x", &value);
+	ptr = (volatile uint32_t *)((volatile char *)mmio + reg);
+
+	printf("Value before: 0x%X\n", *ptr);
+	*ptr = value;
+	printf("Value after: 0x%X\n", *ptr);
+
+	return 0;
+}
+