powerpc/pci: Pull ppc32 PCI features into common

Some of the PCI features we have in ppc32 we will need on ppc64
platforms in the future.  These include support for:

* ppc_md.pci_exclude_device
* indirect config cycles
* early config cycles

We also simplified the logic in fake_pci_bus() to assume it will always
get a valid pci_controller.  Since all current callers seem to pass it
one.

Signed-off-by: Kumar Gala <galak@kernel.crashing.org>
Acked-by: Grant Likely <grant.likely@secretlab.ca>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>

1 files changed, 71 insertions, 0 deletions

diff --git a/arch/powerpc/kernel/pci-common.c b/arch/powerpc/kernel/pci-common.c
index 725ea9144e38..8f84a9a8428e 100644
--- a/arch/powerpc/kernel/pci-common.c
+++ b/arch/powerpc/kernel/pci-common.c
@@ -1617,3 +1617,74 @@ void __devinit pcibios_setup_phb_resources(struct pci_controller *hose)
                  (unsigned long)hose->io_base_virt - _IO_BASE);
 
 }
+
+/*
+ * Null PCI config access functions, for the case when we can't
+ * find a hose.
+ */
+#define NULL_PCI_OP(rw, size, type)                                     \
+static int                                                              \
+null_##rw##_config_##size(struct pci_dev *dev, int offset, type val)    \
+{                                                                       \
+        return PCIBIOS_DEVICE_NOT_FOUND;                                \
+}
+
+static int
+null_read_config(struct pci_bus *bus, unsigned int devfn, int offset,
+                 int len, u32 *val)
+{
+        return PCIBIOS_DEVICE_NOT_FOUND;
+}
+
+static int
+null_write_config(struct pci_bus *bus, unsigned int devfn, int offset,
+                  int len, u32 val)
+{
+        return PCIBIOS_DEVICE_NOT_FOUND;
+}
+
+static struct pci_ops null_pci_ops =
+{
+        .read = null_read_config,
+        .write = null_write_config,
+};
+
+/*
+ * These functions are used early on before PCI scanning is done
+ * and all of the pci_dev and pci_bus structures have been created.
+ */
+static struct pci_bus *
+fake_pci_bus(struct pci_controller *hose, int busnr)
+{
+        static struct pci_bus bus;
+
+        if (hose == 0) {
+                printk(KERN_ERR "Can't find hose for PCI bus %d!\n", busnr);
+        }
+        bus.number = busnr;
+        bus.sysdata = hose;
+        bus.ops = hose? hose->ops: &null_pci_ops;
+        return &bus;
+}
+
+#define EARLY_PCI_OP(rw, size, type)                                    \
+int early_##rw##_config_##size(struct pci_controller *hose, int bus,    \
+                               int devfn, int offset, type value)       \
+{                                                                       \
+        return pci_bus_##rw##_config_##size(fake_pci_bus(hose, bus),    \
+                                            devfn, offset, value);      \
+}
+
+EARLY_PCI_OP(read, byte, u8 *)
+EARLY_PCI_OP(read, word, u16 *)
+EARLY_PCI_OP(read, dword, u32 *)
+EARLY_PCI_OP(write, byte, u8)
+EARLY_PCI_OP(write, word, u16)
+EARLY_PCI_OP(write, dword, u32)
+
+extern int pci_bus_find_capability (struct pci_bus *bus, unsigned int devfn, int cap);
+int early_find_capability(struct pci_controller *hose, int bus, int devfn,
+                          int cap)
+{
+        return pci_bus_find_capability(fake_pci_bus(hose, bus), devfn, cap);
+}