x86/devicetree: Use generic PCI <-> OF matching

Instead of walking the whole PCI tree to update the of_node's for
PCI busses and devices after the fact, enable the new generic core
code for doing so by providing the proper device nodes for the
PCI host bridges

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Acked-by: Grant Likely <grant.likely@secretlab.ca>
Tested-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>

1 files changed, 18 insertions, 42 deletions

diff --git a/arch/x86/kernel/devicetree.c b/arch/x86/kernel/devicetree.c
index 690bc8461835..d23f7af43679 100644
--- a/arch/x86/kernel/devicetree.c
+++ b/arch/x86/kernel/devicetree.c
@@ -123,6 +123,24 @@ static int __init add_bus_probe(void)
 module_init(add_bus_probe);
 
 #ifdef CONFIG_PCI
+struct device_node *pcibios_get_phb_of_node(struct pci_bus *bus)
+{
+        struct device_node *np;
+
+        for_each_node_by_type(np, "pci") {
+                const void *prop;
+                unsigned int bus_min;
+
+                prop = of_get_property(np, "bus-range", NULL);
+                if (!prop)
+                        continue;
+                bus_min = be32_to_cpup(prop);
+                if (bus->number == bus_min)
+                        return np;
+        }
+        return NULL;
+}
+
 static int x86_of_pci_irq_enable(struct pci_dev *dev)
 {
         struct of_irq oirq;
@@ -154,50 +172,8 @@ static void x86_of_pci_irq_disable(struct pci_dev *dev)
 
 void __cpuinit x86_of_pci_init(void)
 {
-        struct device_node *np;
-
         pcibios_enable_irq = x86_of_pci_irq_enable;
         pcibios_disable_irq = x86_of_pci_irq_disable;
-
-        for_each_node_by_type(np, "pci") {
-                const void *prop;
-                struct pci_bus *bus;
-                unsigned int bus_min;
-                struct device_node *child;
-
-                prop = of_get_property(np, "bus-range", NULL);
-                if (!prop)
-                        continue;
-                bus_min = be32_to_cpup(prop);
-
-                bus = pci_find_bus(0, bus_min);
-                if (!bus) {
-                        printk(KERN_ERR "Can't find a node for bus %s.\n",
-                                        np->full_name);
-                        continue;
-                }
-
-                if (bus->self)
-                        bus->self->dev.of_node = np;
-                else
-                        bus->dev.of_node = np;
-
-                for_each_child_of_node(np, child) {
-                        struct pci_dev *dev;
-                        u32 devfn;
-
-                        prop = of_get_property(child, "reg", NULL);
-                        if (!prop)
-                                continue;
-
-                        devfn = (be32_to_cpup(prop) >> 8) & 0xff;
-                        dev = pci_get_slot(bus, devfn);
-                        if (!dev)
-                                continue;
-                        dev->dev.of_node = child;
-                        pci_dev_put(dev);
-                }
-        }
 }
 #endif