LIBPCI: added PCI layer to cpukit/libpci

cpukit/libpci/pci_find_dev.c

@@ -0,0 +1,49 @@
+/*  PCI Help function, Find a PCI device by VENDOR/DEVICE ID
+ *
+ *  COPYRIGHT (c) 2010.
+ *  Cobham Gaisler AB.
+ *
+ *  The license and distribution terms for this file may be
+ *  found in the file LICENSE in this distribution or at
+ *  http://www.rtems.com/license/LICENSE.
+ */
+
+#include <pci.h>
+#include <pci/cfg.h>
+
+struct compare_info {
+	int index;
+	uint16_t vendor;
+	uint16_t device;
+};
+
+static int compare_dev_id(struct pci_dev *dev, void *arg)
+{
+	struct compare_info *info = arg;
+
+	if ((dev->vendor != info->vendor) || (dev->device != info->device))
+		return 0;
+	if (info->index-- == 0)
+		return (int)dev;
+	else
+		return 0;
+}
+
+/* Find a Device in PCI device tree located in RAM */
+int pci_find_dev(uint16_t ven, uint16_t dev, int index, struct pci_dev **ppdev)
+{
+	struct compare_info info;
+	int result;
+
+	info.index = index;
+	info.vendor = ven;
+	info.device = dev;
+
+	result = pci_for_each_dev(compare_dev_id, &info);
+	if (ppdev)
+		*ppdev = (struct pci_dev *)result;
+	if (result == 0)
+		return -1;
+	else
+		return 0;
+}