frv/PCI: Remove pcibios_last_bus

pcibios_last_bus was apparently copied from x86.  On FR-V, it is
statically initialized to -1 and never changed unless the user boots
with "pci=lastbus=<X>".  I doubt that option is used on FR-V, so this
patch removes all the code related to pcibios_last_bus.
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>

arch/frv/mb93090-mb00/pci-frv.h

@@ -30,7 +30,6 @@ void pcibios_resource_survey(void);
 
 /* pci-vdk.c */
 
-extern int __nongpreldata pcibios_last_bus;
 extern struct pci_ops *__nongpreldata pci_root_ops;
 
 /* pci-irq.c */

arch/frv/mb93090-mb00/pci-vdk.c

@@ -25,7 +25,6 @@
 
 unsigned int __nongpreldata pci_probe = 1;
 
-int  __nongpreldata pcibios_last_bus = -1;
 struct pci_ops *__nongpreldata pci_root_ops;
 
 /*
@@ -219,37 +218,6 @@ static struct pci_ops * __init pci_check_direct(void)
 	return NULL;
 }
 
-/*
- * Discover remaining PCI buses in case there are peer host bridges.
- * We use the number of last PCI bus provided by the PCI BIOS.
- */
-static void __init pcibios_fixup_peer_bridges(void)
-{
-	struct pci_bus bus;
-	struct pci_dev dev;
-	int n;
-	u16 l;
-
-	if (pcibios_last_bus <= 0 || pcibios_last_bus >= 0xff)
-		return;
-	printk("PCI: Peer bridge fixup\n");
-	for (n=0; n <= pcibios_last_bus; n++) {
-		if (pci_find_bus(0, n))
-			continue;
-		bus.number = n;
-		bus.ops = pci_root_ops;
-		dev.bus = &bus;
-		for(dev.devfn=0; dev.devfn<256; dev.devfn += 8)
-			if (!pci_read_config_word(&dev, PCI_VENDOR_ID, &l) &&
-			    l != 0x0000 && l != 0xffff) {
-				printk("Found device at %02x:%02x [%04x]\n", n, dev.devfn, l);
-				printk("PCI: Discovered peer bus %02x\n", n);
-				pci_scan_bus(n, pci_root_ops, NULL);
-				break;
-			}
-	}
-}
-
 /*
  * Exceptions for specific devices. Usually work-arounds for fatal design flaws.
  */
@@ -418,7 +386,6 @@ int __init pcibios_init(void)
 	pci_scan_root_bus(NULL, 0, pci_root_ops, NULL, &resources);
 
 	pcibios_irq_init();
-	pcibios_fixup_peer_bridges();
 	pcibios_fixup_irqs();
 	pcibios_resource_survey();
 
@@ -432,9 +399,6 @@ char * __init pcibios_setup(char *str)
 	if (!strcmp(str, "off")) {
 		pci_probe = 0;
 		return NULL;
-	} else if (!strncmp(str, "lastbus=", 8)) {
-		pcibios_last_bus = simple_strtol(str+8, NULL, 0);
-		return NULL;
 	}
 	return str;
 }