Add VGA register read/write tools

Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>

tools/Makefile.am

@@ -28,7 +28,9 @@ bin_PROGRAMS = 				\
 	intel_punit_read		\
 	intel_punit_write		\
 	intel_nc_write			\
-	intel_nc_read
+	intel_nc_read			\
+	intel_vga_read			\
+	intel_vga_write
 
 noinst_PROGRAMS = 			\
 	intel_dump_decode 		\

tools/intel_vga_read.c

@@ -0,0 +1,93 @@
+/*
+ * Copyright © 2013 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:
+ *	Ville Syrjälä <ville.syrjala@linux.intel.com>
+ *
+ */
+
+#include <assert.h>
+#include <stdbool.h>
+#include <stdint.h>
+#include <stdio.h>
+#include <unistd.h>
+#include <sys/io.h>
+#include "intel_gpu_tools.h"
+
+static uint8_t read_reg(uint32_t reg, bool use_mmio)
+{
+	if (use_mmio)
+		return *((volatile uint8_t *)mmio + reg);
+	else
+		return inb(reg);
+}
+
+static void usage(const char *cmdname)
+{
+	printf("Usage: %s [-m] [addr1] [addr2] .. [addrN]\n", cmdname);
+	printf("\t -m : use MMIO instead of port IO\n");
+	printf("\t addr : in 0xXXXX format\n");
+}
+
+int main(int argc, char *argv[])
+{
+	bool use_mmio = false;
+	int ret = 0;
+	uint32_t reg;
+	int i, ch;
+	const char *cmdname = argv[0];
+
+	while ((ch = getopt(argc, argv, "m")) != -1) {
+		switch(ch) {
+		case 'm':
+			use_mmio = true;
+			break;
+		default:
+			break;
+		}
+	}
+	argc -= optind;
+	argv += optind;
+
+	if (argc < 1) {
+		usage(cmdname);
+		return 1;
+	}
+
+	if (use_mmio)
+		intel_register_access_init(intel_get_pci_device(), 0);
+	else
+		assert(iopl(3) == 0);
+
+	for (i = 0; i < argc; i++) {
+		sscanf(argv[i], "0x%x", &reg);
+		printf("0x%X : 0x%X\n", reg, read_reg(reg, use_mmio));
+	}
+
+	if (use_mmio)
+		intel_register_access_fini();
+	else
+		iopl(0);
+
+	return ret;
+}
+

tools/intel_vga_write.c

@@ -0,0 +1,93 @@
+/*
+ * Copyright © 2013 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:
+ *	Ville Syrjälä <ville.syrjala@linux.intel.com>
+ *
+ */
+
+#include <assert.h>
+#include <stdbool.h>
+#include <stdint.h>
+#include <stdio.h>
+#include <unistd.h>
+#include <sys/io.h>
+#include "intel_gpu_tools.h"
+
+static void write_reg(uint32_t reg, uint8_t val, bool use_mmio)
+{
+	if (use_mmio)
+		*((volatile uint8_t *)mmio + reg) = val;
+	else
+		outb(val, reg);
+}
+
+static void usage(const char *cmdname)
+{
+	printf("Usage: %s [-m] addr value\n", cmdname);
+	printf("\t -m : use MMIO instead of port IO\n");
+	printf("\t addr,value : in 0xXXXX format\n");
+}
+
+int main(int argc, char *argv[])
+{
+	bool use_mmio = false;
+	int ret = 0;
+	uint32_t reg, val;
+	int ch;
+	const char *cmdname = argv[0];
+
+	while ((ch = getopt(argc, argv, "m")) != -1) {
+		switch(ch) {
+		case 'm':
+			use_mmio = true;
+			break;
+		default:
+			break;
+		}
+	}
+	argc -= optind;
+	argv += optind;
+
+	if (argc < 2) {
+		usage(cmdname);
+		return 1;
+	}
+
+	sscanf(argv[0], "0x%x", &reg);
+	sscanf(argv[1], "0x%x", &val);
+
+	if (use_mmio)
+		intel_register_access_init(intel_get_pci_device(), 0);
+	else
+		assert(iopl(3) == 0);
+
+	write_reg(reg, val, use_mmio);
+
+	if (use_mmio)
+		intel_register_access_fini();
+	else
+		iopl(0);
+
+	return ret;
+}
+