[POWERPC] Removed remnants of bus_offset

Removed the remants of bus_offset and use self_busno in the mv64x60 case
and use pci_assign_all_buses on 83xx/85xx.

83xx/85xx have multiple PHBs and the firmwares on these devices tend not
to handle topologies with P2P bridges well so we let Linux just reassign
the bus numbers to match.
Signed-off-by: Kumar Gala <galak@kernel.crashing.org>

arch/powerpc/platforms/83xx/pci.c

@@ -61,6 +61,7 @@ int __init mpc83xx_add_bridge(struct device_node *dev)
 		       " bus 0\n", dev->full_name);
 	}
 
+	pci_assign_all_buses = 1;
 	hose = pcibios_alloc_controller();
 	if (!hose)
 		return -ENOMEM;
@@ -80,7 +81,6 @@ int __init mpc83xx_add_bridge(struct device_node *dev)
 	if ((rsrc.start & 0xfffff) == 0x8600) {
 		setup_indirect_pci(hose, immr + 0x8380, immr + 0x8384);
 		primary = 0;
-		hose->bus_offset = hose->first_busno;
 	}
 
 	printk(KERN_INFO "Found MPC83xx PCI host bridge at 0x%016llx. "

arch/powerpc/platforms/85xx/pci.c

@@ -55,6 +55,7 @@ int __init mpc85xx_add_bridge(struct device_node *dev)
 		       " bus 0\n", dev->full_name);
 	}
 
+	pci_assign_all_buses = 1;
 	hose = pcibios_alloc_controller();
 	if (!hose)
 		return -ENOMEM;
@@ -71,7 +72,6 @@ int __init mpc85xx_add_bridge(struct device_node *dev)
 	if ((rsrc.start & 0xfffff) == 0x9000) {
 		setup_indirect_pci(hose, immr + 0x9000, immr + 0x9004);
 		primary = 0;
-		hose->bus_offset = hose->first_busno;
 	}
 
 	printk(KERN_INFO "Found MPC85xx PCI host bridge at 0x%016llx. "

arch/powerpc/sysdev/indirect_pci.c

@@ -44,7 +44,7 @@ indirect_read_config(struct pci_bus *bus, unsigned int devfn, int offset,
 			cfg_type = 1;
 
 	bus_no = (bus->number == hose->first_busno) ?
-			hose->self_busno : bus->number - hose->bus_offset;
+			hose->self_busno : bus->number;
 
 	PCI_CFG_OUT(hose->cfg_addr,
 		 (0x80000000 | (bus_no << 16)
@@ -87,7 +87,7 @@ indirect_write_config(struct pci_bus *bus, unsigned int devfn, int offset,
 			cfg_type = 1;
 
 	bus_no = (bus->number == hose->first_busno) ?
-			hose->self_busno : bus->number - hose->bus_offset;
+			hose->self_busno : bus->number;
 
 	PCI_CFG_OUT(hose->cfg_addr,
 		 (0x80000000 | (bus_no << 16)

arch/powerpc/sysdev/mv64x60_pci.c

@@ -147,7 +147,7 @@ static int __init mv64x60_add_bridge(struct device_node *dev)
 	hose->last_busno = bus_range ? bus_range[1] : 0xff;
 
 	setup_indirect_pci(hose, rsrc.start, rsrc.start + 4);
-	hose->bus_offset = hose->first_busno;
+	hose->self_busno = hose->first_busno;
 
 	printk(KERN_INFO "Found MV64x60 PCI host bridge at 0x%016llx. "
 	       "Firmware bus number: %d->%d\n",

include/asm-ppc/pci-bridge.h

@@ -48,6 +48,7 @@ struct pci_controller {
 	int first_busno;
 	int last_busno;
 	int self_busno;
+	/* bus_offset is only used by ARCH=ppc */
 	int bus_offset;
 
 	void __iomem *io_base_virt;