[PATCH] powerpc: Fix some late PowerMac G5 with PCIe ATI graphics

[Benjamin Herrenschmidt]

A misconfiguration by the firmware of the U4 PCIe bridge on PowerMac G5
with the U4 bridge (latest generations, may also affect the iMac G5
"iSight") is causing us to re-assign the PCI BARs of the video card,
which can get it out of sync with the firmware, thus breaking offb.

This works around it by fixing up the bridge configuration properly
at boot time.

Signed-off-by: Benjamin Herrenschmidt <benh at kernel.crashing.org>
---
 arch/powerpc/platforms/powermac/pci.c |   60 +++++++++++++++++++++++++++++++++
 include/linux/pci_ids.h               |    1 +
 2 files changed, 61 insertions(+), 0 deletions(-)

diff --git a/arch/powerpc/platforms/powermac/pci.c b/arch/powerpc/platforms/powermac/pci.c
index 04cdd32..7913b57 100644
--- a/arch/powerpc/platforms/powermac/pci.c
+++ b/arch/powerpc/platforms/powermac/pci.c
@@ -1286,3 +1286,63 @@ 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
+ */
+static void fixup_u4_pcie(struct pci_dev* dev)
+{
+	struct pci_controller *host = pci_bus_to_host(dev->bus);
+	struct resource *first = NULL, *second = NULL;
+	u32 reg;
+	int i;
+
+	/* Only do that on PowerMac */
+	if (!machine_is(powermac))
+		return;
+
+	/* Find two largest MMIO regions */
+	for (i = 0; i < 3; i++) {
+		struct resource *r = &host->mem_resources[i];
+		if (!(r->flags & IORESOURCE_MEM))
+			continue;
+		if (!first || (r->end - r->start) >
+		    (first->end - first->start)) {
+			second = first;
+			first = r;
+		}
+	}
+	/* Nothing found, bail */
+	if (first == 0)
+		return;
+
+	/* Print things out */
+	printk(KERN_INFO "PCI: Fixup U4 PCIe bridge ranges\n");
+	printk(KERN_INFO "     first: %pR\n", first);
+	if (second)
+		printk(KERN_INFO "    second: %pR\n", second);
+
+	/* 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 = ((first->start >> 16) & 0xfff0) | (first->end & 0xfff00000);
+	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, reg);
+	if (second) {
+		reg = ((second->start >> 16) & 0xfff0) |
+			(second->end & 0xfff00000);
+		pci_write_config_dword(dev, PCI_MEMORY_BASE, reg);
+	}
+}
+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 73b46b6..c86bb6e 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
-- 
1.6.1.2.14.gf26b5