tools: Added intel_dpio_read and intel_dpio_write

In Valleyview the DPLL and lane control registers are accessible only
through side band fabric called DPIO. Added two tools to read and write
registers residing in this space.

v2: Moved the core read/write functions to lib/intel_dpio.c based on
Ben's feedback

Signed-off-by: Vijay Purushothaman <vijay.a.purushothaman@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>

1 files changed, 67 insertions, 0 deletions

diff --git a/tools/intel_dpio_write.c b/tools/intel_dpio_write.c
new file mode 100644
index 000000000..f84299902
--- /dev/null
+++ b/tools/intel_dpio_write.c
@@ -0,0 +1,67 @@
+/*
+ * Copyright © 2012 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:
+ *		Vijay Purushothaman <vijay.a.purushothaman@intel.com>
+ *
+ */
+
+#include <unistd.h>
+#include <stdlib.h>
+#include <stdio.h>
+#include <err.h>
+#include <string.h>
+#include "intel_gpu_tools.h"
+
+static void usage(char *cmdname)
+{
+	printf("Warning : This program will work only on Valleyview\n");
+	printf("Usage: %s [addr] [val]\n", cmdname);
+	printf("\t addr : in 0xXXXX format\n");
+}
+
+int main(int argc, char** argv)
+{
+	int ret = 0;
+	uint32_t reg, val;
+	char *cmdname = strdup(argv[0]);
+	struct pci_device *dev = intel_get_pci_device();
+
+	if (argc != 3 || !IS_VALLEYVIEW(dev->device_id)) {
+		usage(cmdname);
+		ret = 1;
+		goto out;
+	}
+
+	sscanf(argv[1], "0x%x", &reg);
+	sscanf(argv[2], "0x%x", &val);
+
+	intel_register_access_init(dev, 0);
+
+	intel_dpio_reg_write(reg, val);
+
+	intel_register_access_fini();
+
+out:
+	free(cmdname);
+	return ret;
+}