PCI: Add pci_last_busno() helper

This is just a handy routine that reports last PCI busno: we walk
down all the hoses and return last hose's last_busno.

Will be used by PCI/PCIe initialization code.

Signed-off-by: Anton Vorontsov <avorontsov@ru.mvista.com>
Signed-off-by: Kim Phillips <kim.phillips@freescale.com>

drivers/pci/pci.c

@@ -165,6 +165,19 @@ struct pci_controller *pci_bus_to_hose (int bus)
 	return NULL;
 }
 
+int pci_last_busno(void)
+{
+	struct pci_controller *hose = hose_head;
+
+	if (!hose)
+		return -1;
+
+	while (hose->next)
+		hose = hose->next;
+
+	return hose->last_busno;
+}
+
 #ifndef CONFIG_IXP425
 pci_dev_t pci_find_devices(struct pci_device_id *ids, int index)
 {

include/pci.h

@@ -535,6 +535,8 @@ extern int pci_hose_config_device(struct pci_controller *hose,
 				  pci_addr_t mem,
 				  unsigned long command);
 
+int pci_last_busno(void);
+
 #ifdef CONFIG_MPC824X
 extern void pci_mpc824x_init (struct pci_controller *hose);
 #endif