Add a tool to work on i915 hardware in user mode

This is the beginning of a tool that transforms the i9x5 code to user
mode code. Consider this a very early stage although it does produce
two programs. Requires spatch 1.0 or greater.

To try it out, assuming you have an up-to-date spatch,
   sh transform
   make
   make broken

Please don't fall to the temptation to auto-magicize this process.
It's primitive for a reason. That said, suggestions welcome of course.

Change-Id: I0188e36637b198b06c17f6d3c714d990e88bd57d
Signed-off-by: Ronald G. Minnich <rminnich@chromium.org>
Reviewed-on: http://review.coreboot.org/1003
Tested-by: build bot (Jenkins)
Reviewed-by: Ronald G. Minnich <rminnich@gmail.com>

util/i915tool/pci.c

@@ -0,0 +1,97 @@
+/*
+ * This file is part of i915tool
+ *
+ * Copyright (C) 2012 The ChromiumOS Authors.  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 version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301 USA
+ */
+
+#include "video.h"
+
+int find_idlist(struct drm_device *dev, u16 vendor, u16 device)
+{
+	extern const struct pci_device_id pciidlist[];
+	int succ = 0;
+	int i;
+	for(i = 0; pciidlist[i].vendor && !succ; i++){
+		if (vendor == pciidlist[i].vendor && device ==
+				pciidlist[i].device){
+			dev->dev_private->info =
+				(void *)(pciidlist[i].driver_data);
+			succ = 1;
+		}
+	}
+	return succ;
+}
+
+/* there's only going to be one device ... */
+int pci_dev_find(struct drm_device *dev)
+{
+	struct pci_access *pacc = NULL;
+	struct pci_dev *temp;
+	int succ = 0;
+        pacc = pci_alloc();
+	if (! pacc)
+		return 0;
+        pci_init(pacc);
+        pci_scan_bus(pacc);
+
+	for (temp = pacc->devices; temp && ! dev->pdev; temp = temp->next){
+		if ((temp->device_class & 0xff00) == PCI_CLASS_DISPLAY_VGA ) {
+			pci_fill_info(temp, PCI_FILL_IDENT |
+					PCI_FILL_BASES | PCI_FILL_CLASS);
+			dev->pdev = temp;
+		}
+	}
+
+	if (dev->pdev)
+		succ = find_idlist(dev, dev->pdev->vendor_id,
+					dev->pdev->device_id);
+	return succ;
+}
+
+/* Support library for kernel style pci functions. We could do a semantic
+ * patch for it but this is easier to debug as we can fill it with prints
+ * if we want. And no cpp abuse here. Keep it simple.
+ */
+
+void pci_read_config_byte(struct pci_dev *dev, unsigned long offset, u8 *val)
+{
+	*val = pci_read_byte(dev, offset);
+}
+
+void pci_write_config_byte(struct pci_dev *dev, unsigned long offset, u8 val)
+{
+	pci_write_byte(dev, offset, val);
+}
+
+void pci_read_config_word(struct pci_dev *dev, unsigned long offset, u16 *val)
+{
+	*val = pci_read_word(dev, offset);
+}
+
+void pci_write_config_word(struct pci_dev *dev, unsigned long offset, u16 val)
+{
+	pci_write_word(dev, offset, val);
+}
+
+void pci_read_config_dword(struct pci_dev *dev, unsigned long offset, u32 *val)
+{
+	*val = pci_read_long(dev, offset);
+}
+
+void pci_write_config_dword(struct pci_dev *dev, unsigned long offset, u32 val)
+{
+	pci_write_long(dev, offset, val);
+}