[POWERPC] Generic OF platform driver for PCI host bridges.

When enabled in Kconfig, it will pick up any of_platform_device
matching it's match list (currently type "pci", "pcix", "pcie",
or "ht" and setup a PHB for it.

Platform must provide a ppc_md.pci_setup_phb() for it to work
(for doing the necessary initialisations specific to a given PHB
like setting up the config space ops).

It's currently only available on 64 bits as the 32 bits PCI code
can't quite cope with it in it's current form. I will fix that
later.

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

6 files changed, 124 insertions, 4 deletions

diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig
index 65588a6bd2fe..3d26ba7ad76d 100644
--- a/arch/powerpc/Kconfig
+++ b/arch/powerpc/Kconfig
@@ -223,6 +223,11 @@ config PPC_DCR
         depends on PPC_DCR_NATIVE || PPC_DCR_MMIO
         default y
 
+config PPC_OF_PLATFORM_PCI
+        bool
+        depends on PPC64 # not supported on 32 bits yet
+        default n
+
 config BOOKE
         bool
         depends on E200 || E500
@@ -469,6 +474,7 @@ config PPC_CELL_NATIVE
         bool
         select PPC_CELL
         select PPC_DCR_MMIO
+        select PPC_OF_PLATFORM_PCI
         select MPIC
         default n
 
diff --git a/arch/powerpc/kernel/of_platform.c b/arch/powerpc/kernel/of_platform.c
index 7a0e77af7c9f..6029543c1b5e 100644
--- a/arch/powerpc/kernel/of_platform.c
+++ b/arch/powerpc/kernel/of_platform.c
@@ -1,6 +1,7 @@
 /*
  *    Copyright (C) 2006 Benjamin Herrenschmidt, IBM Corp.
  *                       <benh@kernel.crashing.org>
+ *    and                Arnd Bergmann, IBM Corp.
  *
  *  This program is free software; you can redistribute it and/or
  *  modify it under the terms of the GNU General Public License
@@ -17,12 +18,15 @@
 #include <linux/module.h>
 #include <linux/mod_devicetable.h>
 #include <linux/slab.h>
+#include <linux/pci.h>
 
 #include <asm/errno.h>
 #include <asm/dcr.h>
 #include <asm/of_device.h>
 #include <asm/of_platform.h>
 #include <asm/topology.h>
+#include <asm/pci-bridge.h>
+#include <asm/ppc-pci.h>
 
 /*
  * The list of OF IDs below is used for matching bus types in the
@@ -377,3 +381,102 @@ struct of_device *of_find_device_by_phandle(phandle ph)
         return NULL;
 }
 EXPORT_SYMBOL(of_find_device_by_phandle);
+
+
+#ifdef CONFIG_PPC_OF_PLATFORM_PCI
+
+/* The probing of PCI controllers from of_platform is currently
+ * 64 bits only, mostly due to gratuitous differences between
+ * the 32 and 64 bits PCI code on PowerPC and the 32 bits one
+ * lacking some bits needed here.
+ */
+
+static int __devinit of_pci_phb_probe(struct of_device *dev,
+                                      const struct of_device_id *match)
+{
+        struct pci_controller *phb;
+
+        /* Check if we can do that ... */
+        if (ppc_md.pci_setup_phb == NULL)
+                return -ENODEV;
+
+        printk(KERN_INFO "Setting up PCI bus %s\n", dev->node->full_name);
+
+        /* Alloc and setup PHB data structure */
+        phb = pcibios_alloc_controller(dev->node);
+        if (!phb)
+                return -ENODEV;
+
+        /* Setup parent in sysfs */
+        phb->parent = &dev->dev;
+
+        /* Setup the PHB using arch provided callback */
+        if (ppc_md.pci_setup_phb(phb)) {
+                pcibios_free_controller(phb);
+                return -ENODEV;
+        }
+
+        /* Process "ranges" property */
+        pci_process_bridge_OF_ranges(phb, dev->node, 0);
+
+        /* Setup IO space.
+         * This will not work properly for ISA IOs, something needs to be done
+         * about it if we ever generalize that way of probing PCI brigdes
+         */
+        pci_setup_phb_io_dynamic(phb, 0);
+
+        /* Init pci_dn data structures */
+        pci_devs_phb_init_dynamic(phb);
+
+        /* Register devices with EEH */
+#ifdef CONFIG_EEH
+        if (dev->node->child)
+                eeh_add_device_tree_early(dev->node);
+#endif /* CONFIG_EEH */
+
+        /* Scan the bus */
+        scan_phb(phb);
+
+        /* Claim resources. This might need some rework as well depending
+         * wether we are doing probe-only or not, like assigning unassigned
+         * resources etc...
+         */
+        pcibios_claim_one_bus(phb->bus);
+
+        /* Finish EEH setup */
+#ifdef CONFIG_EEH
+        eeh_add_device_tree_late(phb->bus);
+#endif
+
+        /* Add probed PCI devices to the device model */
+        pci_bus_add_devices(phb->bus);
+
+        return 0;
+}
+
+static struct of_device_id of_pci_phb_ids[] = {
+        { .type = "pci", },
+        { .type = "pcix", },
+        { .type = "pcie", },
+        { .type = "pciex", },
+        { .type = "ht", },
+        {}
+};
+
+static struct of_platform_driver of_pci_phb_driver = {
+       .name = "of-pci",
+       .match_table = of_pci_phb_ids,
+       .probe = of_pci_phb_probe,
+       .driver = {
+               .multithread_probe = 1,
+       },
+};
+
+static __init int of_pci_phb_init(void)
+{
+        return of_register_platform_driver(&of_pci_phb_driver);
+}
+
+device_initcall(of_pci_phb_init);
+
+#endif /* CONFIG_PPC_OF_PLATFORM_PCI */
diff --git a/arch/powerpc/kernel/pci_64.c b/arch/powerpc/kernel/pci_64.c
index 74e580d25c1b..d800e19ea564 100644
--- a/arch/powerpc/kernel/pci_64.c
+++ b/arch/powerpc/kernel/pci_64.c
@@ -210,6 +210,10 @@ struct pci_controller * pcibios_alloc_controller(struct device_node *dev)
 
 void pcibios_free_controller(struct pci_controller *phb)
 {
+        spin_lock(&hose_spinlock);
+        list_del(&phb->list_node);
+        spin_unlock(&hose_spinlock);
+
         if (phb->is_dynamic)
                 kfree(phb);
 }
@@ -1242,6 +1246,11 @@ static void __devinit do_bus_setup(struct pci_bus *bus)
 void __devinit pcibios_fixup_bus(struct pci_bus *bus)
 {
         struct pci_dev *dev = bus->self;
+        struct device_node *np;
+
+        np = pci_bus_to_OF_node(bus);
+
+        DBG("pcibios_fixup_bus(%s)\n", np ? np->full_name : "<???>");
 
         if (dev && pci_probe_only &&
             (dev->class >> 8) == PCI_CLASS_BRIDGE_PCI) {
diff --git a/arch/powerpc/kernel/rtas_pci.c b/arch/powerpc/kernel/rtas_pci.c
index 2576e12d7255..03cacc25a0ae 100644
--- a/arch/powerpc/kernel/rtas_pci.c
+++ b/arch/powerpc/kernel/rtas_pci.c
@@ -257,8 +257,10 @@ static int phb_set_bus_ranges(struct device_node *dev,
         return 0;
 }
 
-int __devinit setup_phb(struct device_node *dev, struct pci_controller *phb)
+int __devinit rtas_setup_phb(struct pci_controller *phb)
 {
+        struct device_node *dev = phb->arch_data;
+
         if (is_python(dev))
                 python_countermeasures(dev);
 
@@ -290,7 +292,7 @@ unsigned long __init find_and_init_phbs(void)
                 phb = pcibios_alloc_controller(node);
                 if (!phb)
                         continue;
-                setup_phb(node, phb);
+                rtas_setup_phb(phb);
                 pci_process_bridge_OF_ranges(phb, node, 0);
                 pci_setup_phb_io(phb, index == 0);
                 index++;
@@ -362,7 +364,6 @@ int pcibios_remove_root_bus(struct pci_controller *phb)
                 }
         }
 
-        list_del(&phb->list_node);
         pcibios_free_controller(phb);
 
         return 0;
diff --git a/arch/powerpc/platforms/cell/setup.c b/arch/powerpc/platforms/cell/setup.c
index b39753f16d48..7e18420166c4 100644
--- a/arch/powerpc/platforms/cell/setup.c
+++ b/arch/powerpc/platforms/cell/setup.c
@@ -256,6 +256,7 @@ define_machine(cell) {
         .check_legacy_ioport    = cell_check_legacy_ioport,
         .progress               = cell_progress,
         .init_IRQ               = cell_init_irq,
+        .pci_setup_phb          = rtas_setup_phb,
 #ifdef CONFIG_KEXEC
         .machine_kexec          = default_machine_kexec,
         .machine_kexec_prepare  = default_machine_kexec_prepare,
diff --git a/arch/powerpc/platforms/pseries/pci_dlpar.c b/arch/powerpc/platforms/pseries/pci_dlpar.c
index bb0cb5c5b565..ac56b868913a 100644
--- a/arch/powerpc/platforms/pseries/pci_dlpar.c
+++ b/arch/powerpc/platforms/pseries/pci_dlpar.c
@@ -195,7 +195,7 @@ struct pci_controller * __devinit init_phb_dynamic(struct device_node *dn)
         phb = pcibios_alloc_controller(dn);
         if (!phb)
                 return NULL;
-        setup_phb(dn, phb);
+        rtas_setup_phb(phb);
         pci_process_bridge_OF_ranges(phb, dn, 0);
 
         pci_setup_phb_io_dynamic(phb, primary);