powerpc/pci: Clean up direct access to sysdata by celleb platforms

We shouldn't directly access sysdata to get the device node to just
go get the pci_controller.  We can call pci_bus_to_host() for this
purpose.

Signed-off-by: Kumar Gala <galak@kernel.crashing.org>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>

arch/powerpc/platforms/cell/celleb_pci.c

@@ -162,8 +162,7 @@ static int celleb_fake_pci_read_config(struct pci_bus *bus,
 		unsigned int devfn, int where, int size, u32 *val)
 {
 	char *config;
-	struct device_node *node;
-	struct pci_controller *hose;
+	struct pci_controller *hose = pci_bus_to_host(bus);
 	unsigned int devno = devfn >> 3;
 	unsigned int fn = devfn & 0x7;
 
@@ -171,8 +170,6 @@ static int celleb_fake_pci_read_config(struct pci_bus *bus,
 	BUG_ON(where % size);
 
 	pr_debug("    fake read: bus=0x%x, ", bus->number);
-	node = (struct device_node *)bus->sysdata;
-	hose = pci_find_hose_for_OF_device(node);
 	config = get_fake_config_start(hose, devno, fn);
 
 	pr_debug("devno=0x%x, where=0x%x, size=0x%x, ", devno, where, size);
@@ -192,8 +189,7 @@ static int celleb_fake_pci_write_config(struct pci_bus *bus,
 		unsigned int devfn, int where, int size, u32 val)
 {
 	char *config;
-	struct device_node *node;
-	struct pci_controller *hose;
+	struct pci_controller *hose = pci_bus_to_host(bus);
 	struct celleb_pci_resource *res;
 	unsigned int devno = devfn >> 3;
 	unsigned int fn = devfn & 0x7;
@@ -201,8 +197,6 @@ static int celleb_fake_pci_write_config(struct pci_bus *bus,
 	/* allignment check */
 	BUG_ON(where % size);
 
-	node = (struct device_node *)bus->sysdata;
-	hose = pci_find_hose_for_OF_device(node);
 	config = get_fake_config_start(hose, devno, fn);
 
 	if (!config)

arch/powerpc/platforms/cell/celleb_scc_epci.c

@@ -134,15 +134,11 @@ static int celleb_epci_read_config(struct pci_bus *bus,
 {
 	PCI_IO_ADDR epci_base;
 	PCI_IO_ADDR addr;
-	struct device_node *node;
-	struct pci_controller *hose;
+	struct pci_controller *hose = pci_bus_to_host(bus);
 
 	/* allignment check */
 	BUG_ON(where % size);
 
-	node = (struct device_node *)bus->sysdata;
-	hose = pci_find_hose_for_OF_device(node);
-
 	if (!celleb_epci_get_epci_cfg(hose))
 		return PCIBIOS_DEVICE_NOT_FOUND;
 
@@ -198,16 +194,11 @@ static int celleb_epci_write_config(struct pci_bus *bus,
 {
 	PCI_IO_ADDR epci_base;
 	PCI_IO_ADDR addr;
-	struct device_node *node;
-	struct pci_controller *hose;
+	struct pci_controller *hose = pci_bus_to_host(bus);
 
 	/* allignment check */
 	BUG_ON(where % size);
 
-	node = (struct device_node *)bus->sysdata;
-	hose = pci_find_hose_for_OF_device(node);
-
-
 	if (!celleb_epci_get_epci_cfg(hose))
 		return PCIBIOS_DEVICE_NOT_FOUND;
 

arch/powerpc/platforms/cell/celleb_scc_pciex.c

@@ -366,11 +366,7 @@ static void config_write_pciex_rc(unsigned int __iomem *base, uint32_t where,
 static int scc_pciex_read_config(struct pci_bus *bus, unsigned int devfn,
 				 int where, int size, unsigned int *val)
 {
-	struct device_node *dn;
-	struct pci_controller *phb;
-
-	dn = bus->sysdata;
-	phb = pci_find_hose_for_OF_device(dn);
+	struct pci_controller *phb = pci_bus_to_host(bus);
 
 	if (bus->number == phb->first_busno && PCI_SLOT(devfn) != 1) {
 		*val = ~0;
@@ -389,11 +385,7 @@ static int scc_pciex_read_config(struct pci_bus *bus, unsigned int devfn,
 static int scc_pciex_write_config(struct pci_bus *bus, unsigned int devfn,
 				  int where, int size, unsigned int val)
 {
-	struct device_node *dn;
-	struct pci_controller *phb;
-
-	dn = bus->sysdata;
-	phb = pci_find_hose_for_OF_device(dn);
+	struct pci_controller *phb = pci_bus_to_host(bus);
 
 	if (bus->number == phb->first_busno && PCI_SLOT(devfn) != 1)
 		return PCIBIOS_DEVICE_NOT_FOUND;