LIBPCI: added PCI layer to cpukit/libpci

1 files changed, 52 insertions, 0 deletions

diff --git a/cpukit/libpci/pci_find.c b/cpukit/libpci/pci_find.c
new file mode 100644
index 0000000000..945cb56ea9
--- /dev/null
+++ b/cpukit/libpci/pci_find.c
@@ -0,0 +1,52 @@
+/*  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/access.h>
+
+struct compare_info {
+	int index;
+	uint16_t vendor;
+	uint16_t device;
+};
+
+static int compare_dev_id(pci_dev_t pcidev, void *arg)
+{
+	struct compare_info *info = arg;
+	uint16_t vid, did;
+
+	pci_cfg_r16(pcidev, PCI_VENDOR_ID, &vid);
+	pci_cfg_r16(pcidev, PCI_DEVICE_ID, &did);
+	if ((vid != info->vendor) || (did != info->device))
+		return 0;
+	if (info->index-- == 0)
+		return pcidev;
+	else
+		return 0;
+}
+
+/* Find a Device in PCI configuration space */
+int pci_find(uint16_t ven, uint16_t dev, int index, pci_dev_t *pdev)
+{
+	struct compare_info info;
+	int result;
+
+	info.index = index;
+	info.vendor = ven;
+	info.device = dev;
+
+	result = pci_for_each(compare_dev_id, &info);
+	if (pdev)
+		*pdev = (pci_dev_t)result;
+	if (result == 0)
+		return -1;
+	else
+		return 0;
+}