2 files changed, 62 insertions, 0 deletions

diff --git a/arch/powerpc/platforms/powermac/pci.c b/arch/powerpc/platforms/powermac/pci.c
index 04cdd32624d4..e81403b245b5 100644
--- a/arch/powerpc/platforms/powermac/pci.c
+++ b/arch/powerpc/platforms/powermac/pci.c
@@ -1286,3 +1286,64 @@ static void fixup_k2_sata(struct pci_dev* dev)
 }
 DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_SERVERWORKS, 0x0240, fixup_k2_sata);
 
+/*
+ * On U4 (aka CPC945) the PCIe root complex "P2P" bridge resource ranges aren't
+ * configured by the firmware. The bridge itself seems to ignore them but it
+ * causes problems with Linux which then re-assigns devices below the bridge,
+ * thus changing addresses of those devices from what was in the device-tree,
+ * which sucks when those are video cards using offb
+ *
+ * We could just mark it transparent but I prefer fixing up the resources to
+ * properly show what's going on here, as I have some doubts about having them
+ * badly configured potentially being an issue for DMA.
+ *
+ * We leave PIO alone, it seems to be fine
+ *
+ * Oh and there's another funny bug. The OF properties advertize the region
+ * 0xf1000000..0xf1ffffff as being forwarded as memory space. But that's
+ * actually not true, this region is the memory mapped config space. So we
+ * also need to filter it out or we'll map things in the wrong place.
+ */
+static void fixup_u4_pcie(struct pci_dev* dev)
+{
+        struct pci_controller *host = pci_bus_to_host(dev->bus);
+        struct resource *region = NULL;
+        u32 reg;
+        int i;
+
+        /* Only do that on PowerMac */
+        if (!machine_is(powermac))
+                return;
+
+        /* Find the largest MMIO region */
+        for (i = 0; i < 3; i++) {
+                struct resource *r = &host->mem_resources[i];
+                if (!(r->flags & IORESOURCE_MEM))
+                        continue;
+                /* Skip the 0xf0xxxxxx..f2xxxxxx regions, we know they
+                 * are reserved by HW for other things
+                 */
+                if (r->start >= 0xf0000000 && r->start < 0xf3000000)
+                        continue;
+                if (!region || (r->end - r->start) >
+                    (region->end - region->start))
+                        region = r;
+        }
+        /* Nothing found, bail */
+        if (region == 0)
+                return;
+
+        /* Print things out */
+        printk(KERN_INFO "PCI: Fixup U4 PCIe bridge range: %pR\n", region);
+
+        /* Fixup bridge config space. We know it's a Mac, resource aren't
+         * offset so let's just blast them as-is. We also know that they
+         * fit in 32 bits
+         */
+        reg = ((region->start >> 16) & 0xfff0) | (region->end & 0xfff00000);
+        pci_write_config_dword(dev, PCI_MEMORY_BASE, reg);
+        pci_write_config_dword(dev, PCI_PREF_BASE_UPPER32, 0);
+        pci_write_config_dword(dev, PCI_PREF_LIMIT_UPPER32, 0);
+        pci_write_config_dword(dev, PCI_PREF_MEMORY_BASE, 0);
+}
+DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_APPLE, PCI_DEVICE_ID_APPLE_U4_PCIE, fixup_u4_pcie);
diff --git a/include/linux/pci_ids.h b/include/linux/pci_ids.h
index 73b46b6b904f..c86bb6e3dfcc 100644
--- a/include/linux/pci_ids.h
+++ b/include/linux/pci_ids.h
@@ -877,6 +877,7 @@
 #define PCI_DEVICE_ID_APPLE_SH_SUNGEM   0x0051
 #define PCI_DEVICE_ID_APPLE_U3L_AGP     0x0058
 #define PCI_DEVICE_ID_APPLE_U3H_AGP     0x0059
+#define PCI_DEVICE_ID_APPLE_U4_PCIE     0x005b
 #define PCI_DEVICE_ID_APPLE_IPID2_AGP   0x0066
 #define PCI_DEVICE_ID_APPLE_IPID2_ATA   0x0069
 #define PCI_DEVICE_ID_APPLE_IPID2_FW    0x006a