[POWERPC] cell: Generalize io-workarounds code

This splits cell io-workaround code into spider-pci dependent code and
a generic part, and also moves io-workarounds initialization into
cell_setup_phb.

Signed-off-by: Kou Ishizaki <kou.ishizaki@toshiba.co.jp>
Acked-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Paul Mackerras <paulus@samba.org>

arch/powerpc/kernel/of_platform.c

@@ -275,6 +275,8 @@ static int __devinit of_pci_phb_probe(struct of_device *dev,
 
 	/* Scan the bus */
 	scan_phb(phb);
+	if (phb->bus == NULL)
+		return -ENXIO;
 
 	/* Claim resources. This might need some rework as well depending
 	 * wether we are doing probe-only or not, like assigning unassigned

arch/powerpc/platforms/cell/Makefile

@@ -1,6 +1,7 @@
 obj-$(CONFIG_PPC_CELL_NATIVE)		+= interrupt.o iommu.o setup.o \
 					   cbe_regs.o spider-pic.o \
-					   pervasive.o pmu.o io-workarounds.o
+					   pervasive.o pmu.o io-workarounds.o \
+					   spider-pci.o
 obj-$(CONFIG_CBE_RAS)			+= ras.o
 
 obj-$(CONFIG_CBE_THERM)			+= cbe_thermal.o