powerpc/pci: Use common PHB resource hookup

The 32-bit and 64-bit powerpc PCI code used to set up the resource
pointers of the root bus of a given PHB in completely different
places.

This unifies this in large part, by making 32-bit use a routine very
similar to what 64-bit does when initially scanning the PCI busses.

The actual setup of the PHB resources itself is then moved to a
common function in pci-common.c.

This should cause no functional change on 64-bit.  On 32-bit, the
effect is that the PHB resources are going to be setup a bit earlier,
instead of being setup from pcibios_fixup_bus().

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Paul Mackerras <paulus@samba.org>

3 files changed, 95 insertions, 60 deletions

diff --git a/arch/powerpc/kernel/pci-common.c b/arch/powerpc/kernel/pci-common.c
index 09ac98e2a502..6d46bfabdbe4 100644
--- a/arch/powerpc/kernel/pci-common.c
+++ b/arch/powerpc/kernel/pci-common.c
@@ -1421,3 +1421,61 @@ int pcibios_enable_device(struct pci_dev *dev, int mask)
 
         return pci_enable_resources(dev, mask);
 }
+
+void __devinit pcibios_setup_phb_resources(struct pci_controller *hose)
+{
+        struct pci_bus *bus = hose->bus;
+        struct resource *res;
+        int i;
+
+        /* Hookup PHB IO resource */
+        bus->resource[0] = res = &hose->io_resource;
+
+        if (!res->flags) {
+                printk(KERN_WARNING "PCI: I/O resource not set for host"
+                       " bridge %s (domain %d)\n",
+                       hose->dn->full_name, hose->global_number);
+#ifdef CONFIG_PPC32
+                /* Workaround for lack of IO resource only on 32-bit */
+                res->start = (unsigned long)hose->io_base_virt - isa_io_base;
+                res->end = res->start + IO_SPACE_LIMIT;
+                res->flags = IORESOURCE_IO;
+#endif /* CONFIG_PPC32 */
+        }
+
+        pr_debug("PCI: PHB IO resource    = %016llx-%016llx [%lx]\n",
+                 (unsigned long long)res->start,
+                 (unsigned long long)res->end,
+                 (unsigned long)res->flags);
+
+        /* Hookup PHB Memory resources */
+        for (i = 0; i < 3; ++i) {
+                res = &hose->mem_resources[i];
+                if (!res->flags) {
+                        if (i > 0)
+                                continue;
+                        printk(KERN_ERR "PCI: Memory resource 0 not set for "
+                               "host bridge %s (domain %d)\n",
+                               hose->dn->full_name, hose->global_number);
+#ifdef CONFIG_PPC32
+                        /* Workaround for lack of MEM resource only on 32-bit */
+                        res->start = hose->pci_mem_offset;
+                        res->end = (resource_size_t)-1LL;
+                        res->flags = IORESOURCE_MEM;
+#endif /* CONFIG_PPC32 */
+                }
+                bus->resource[i+1] = res;
+
+                pr_debug("PCI: PHB MEM resource %d = %016llx-%016llx [%lx]\n", i,
+                         (unsigned long long)res->start,
+                         (unsigned long long)res->end,
+                         (unsigned long)res->flags);
+        }
+
+        pr_debug("PCI: PHB MEM offset     = %016llx\n",
+                 (unsigned long long)hose->pci_mem_offset);
+        pr_debug("PCI: PHB IO  offset     = %08lx\n",
+                 (unsigned long)hose->io_base_virt - _IO_BASE);
+
+}
+
diff --git a/arch/powerpc/kernel/pci_32.c b/arch/powerpc/kernel/pci_32.c
index fdcc898e58db..883040358273 100644
--- a/arch/powerpc/kernel/pci_32.c
+++ b/arch/powerpc/kernel/pci_32.c
@@ -373,10 +373,41 @@ void pcibios_make_OF_bus_map(void)
 }
 #endif /* CONFIG_PPC_OF */
 
+static void __devinit pcibios_scan_phb(struct pci_controller *hose)
+{
+        struct pci_bus *bus;
+        struct device_node *node = hose->dn;
+        unsigned long io_offset;
+        struct resource *res = &hose->io_resource;
+
+        pr_debug("PCI: Scanning PHB %s\n",
+                 node ? node->full_name : "<NO NAME>");
+
+        /* Create an empty bus for the toplevel */
+        bus = pci_create_bus(hose->parent, hose->first_busno, hose->ops, hose);
+        if (bus == NULL) {
+                printk(KERN_ERR "Failed to create bus for PCI domain %04x\n",
+                       hose->global_number);
+                return;
+        }
+        bus->secondary = hose->first_busno;
+        hose->bus = bus;
+
+        /* Fixup IO space offset */
+        io_offset = (unsigned long)hose->io_base_virt - isa_io_base;
+        res->start = (res->start + io_offset) & 0xffffffffu;
+        res->end = (res->end + io_offset) & 0xffffffffu;
+
+        /* Wire up PHB bus resources */
+        pcibios_setup_phb_resources(hose);
+
+        /* Scan children */
+        hose->last_busno = bus->subordinate = pci_scan_child_bus(bus);
+}
+
 static int __init pcibios_init(void)
 {
         struct pci_controller *hose, *tmp;
-        struct pci_bus *bus;
         int next_busno = 0;
 
         printk(KERN_INFO "PCI: Probing PCI hardware\n");
@@ -389,12 +420,8 @@ static int __init pcibios_init(void)
                 if (pci_assign_all_buses)
                         hose->first_busno = next_busno;
                 hose->last_busno = 0xff;
-                bus = pci_scan_bus_parented(hose->parent, hose->first_busno,
-                                            hose->ops, hose);
-                if (bus) {
-                        pci_bus_add_devices(bus);
-                        hose->last_busno = bus->subordinate;
-                }
+                pcibios_scan_phb(hose);
+                pci_bus_add_devices(hose->bus);
                 if (pci_assign_all_buses || next_busno <= hose->last_busno)
                         next_busno = hose->last_busno + pcibios_assign_bus_offset;
         }
@@ -421,45 +448,8 @@ subsys_initcall(pcibios_init);
 
 void __devinit pcibios_do_bus_setup(struct pci_bus *bus)
 {
-        struct pci_controller *hose = (struct pci_controller *) bus->sysdata;
-        unsigned long io_offset;
-        struct resource *res;
-        int i;
         struct pci_dev *dev;
 
-        /* Hookup PHB resources */
-        io_offset = (unsigned long)hose->io_base_virt - isa_io_base;
-        if (bus->parent == NULL) {
-                /* This is a host bridge - fill in its resources */
-                hose->bus = bus;
-
-                bus->resource[0] = res = &hose->io_resource;
-                if (!res->flags) {
-                        if (io_offset)
-                                printk(KERN_ERR "I/O resource not set for host"
-                                       " bridge %d\n", hose->global_number);
-                        res->start = 0;
-                        res->end = IO_SPACE_LIMIT;
-                        res->flags = IORESOURCE_IO;
-                }
-                res->start = (res->start + io_offset) & 0xffffffffu;
-                res->end = (res->end + io_offset) & 0xffffffffu;
-
-                for (i = 0; i < 3; ++i) {
-                        res = &hose->mem_resources[i];
-                        if (!res->flags) {
-                                if (i > 0)
-                                        continue;
-                                printk(KERN_ERR "Memory resource not set for "
-                                       "host bridge %d\n", hose->global_number);
-                                res->start = hose->pci_mem_offset;
-                                res->end = ~0U;
-                                res->flags = IORESOURCE_MEM;
-                        }
-                        bus->resource[i+1] = res;
-                }
-        }
-
         if (ppc_md.pci_dma_bus_setup)
                 ppc_md.pci_dma_bus_setup(bus);
 
diff --git a/arch/powerpc/kernel/pci_64.c b/arch/powerpc/kernel/pci_64.c
index ffada88a4484..f5fc547284bc 100644
--- a/arch/powerpc/kernel/pci_64.c
+++ b/arch/powerpc/kernel/pci_64.c
@@ -322,7 +322,7 @@ void __devinit scan_phb(struct pci_controller *hose)
 {
         struct pci_bus *bus;
         struct device_node *node = hose->dn;
-        int i, mode;
+        int mode;
 
         pr_debug("PCI: Scanning PHB %s\n",
                  node ? node->full_name : "<NO NAME>");
@@ -341,20 +341,7 @@ void __devinit scan_phb(struct pci_controller *hose)
         pcibios_map_io_space(bus);
 
         /* Wire up PHB bus resources */
-        pr_debug("PCI: PHB IO resource    = %016lx-%016lx [%lx]\n",
-                 hose->io_resource.start, hose->io_resource.end,
-                 hose->io_resource.flags);
-        bus->resource[0] = &hose->io_resource;
-        for (i = 0; i < 3; ++i) {
-                pr_debug("PCI: PHB MEM resource %d = %016lx-%016lx [%lx]\n", i,
-                         hose->mem_resources[i].start,
-                         hose->mem_resources[i].end,
-                         hose->mem_resources[i].flags);
-                bus->resource[i+1] = &hose->mem_resources[i];
-        }
-        pr_debug("PCI: PHB MEM offset     = %016lx\n", hose->pci_mem_offset);
-        pr_debug("PCI: PHB IO  offset     = %08lx\n",
-            (unsigned long)hose->io_base_virt - _IO_BASE);
+        pcibios_setup_phb_resources(hose);
 
         /* Get probe mode and perform scan */
         mode = PCI_PROBE_NORMAL;
@@ -376,7 +363,7 @@ static int __init pcibios_init(void)
 
         printk(KERN_INFO "PCI: Probing PCI hardware\n");
 
-        /* For now, override phys_mem_access_prot. If we need it,
+        /* For now, override phys_mem_access_prot. If we need it,g
          * later, we may move that initialization to each ppc_md
          */
         ppc_md.phys_mem_access_prot = pci_phys_mem_access_prot;