openwrt/target/linux/brcm47xx/patches-2.6.25/690-mips-allow-pciregister-after-boot.patch

Allow registering PCI devices after early boot.

This is an ugly hack and needs to be rewritten before going upstream.
Index: linux-2.6.25/arch/mips/pci/pci.c
===================================================================
--- linux-2.6.25.orig/arch/mips/pci/pci.c	2008-04-27 21:49:19.000000000 +0100
+++ linux-2.6.25/arch/mips/pci/pci.c	2008-04-27 21:58:31.000000000 +0100
@@ -21,6 +21,17 @@
  */
 int pci_probe_only;
 
+/*
+ * Indicate whether PCI-bios init was already done.
+ */
+static int pcibios_init_done;
+
+/*
+ * The currently used busnumber.
+ */
+static int next_busno;
+static int need_domain_info;
+
 #define PCI_ASSIGN_ALL_BUSSES	1
 
 unsigned int pci_probe = PCI_ASSIGN_ALL_BUSSES;
@@ -75,8 +86,32 @@ pcibios_align_resource(void *data, struc
 	res->start = start;
 }
 
-void __devinit register_pci_controller(struct pci_controller *hose)
+/* Most MIPS systems have straight-forward swizzling needs.  */
+
+static inline u8 bridge_swizzle(u8 pin, u8 slot)
+{
+	return (((pin - 1) + slot) % 4) + 1;
+}
+
+static u8 common_swizzle(struct pci_dev *dev, u8 *pinp)
 {
+	u8 pin = *pinp;
+
+	while (dev->bus->parent) {
+		pin = bridge_swizzle(pin, PCI_SLOT(dev->devfn));
+		/* Move up the chain of bridges. */
+		dev = dev->bus->self;
+        }
+	*pinp = pin;
+
+	/* The slot is the slot of the last bridge. */
+	return PCI_SLOT(dev->devfn);
+}
+
+void register_pci_controller(struct pci_controller *hose)
+{
+	struct pci_bus *bus;
+
 	if (request_resource(&iomem_resource, hose->mem_resource) < 0)
 		goto out;
 	if (request_resource(&ioport_resource, hose->io_resource) < 0) {
@@ -84,9 +119,6 @@ void __devinit register_pci_controller(s
 		goto out;
 	}
 
-	*hose_tail = hose;
-	hose_tail = &hose->next;
-
 	/*
 	 * Do not panic here but later - this might hapen before console init.
 	 */
@@ -94,41 +126,47 @@ void __devinit register_pci_controller(s
 		printk(KERN_WARNING
 		       "registering PCI controller with io_map_base unset\n");
 	}
-	return;
 
-out:
-	printk(KERN_WARNING
-	       "Skipping PCI bus scan due to resource conflict\n");
-}
+	if (pcibios_init_done) {
+		//TODO
 
-/* Most MIPS systems have straight-forward swizzling needs.  */
+		printk(KERN_INFO "Registering a PCI bus after boot\n");
 
-static inline u8 bridge_swizzle(u8 pin, u8 slot)
-{
-	return (((pin - 1) + slot) % 4) + 1;
-}
+		if (!hose->iommu)
+			PCI_DMA_BUS_IS_PHYS = 1;
 
-static u8 __init common_swizzle(struct pci_dev *dev, u8 *pinp)
-{
-	u8 pin = *pinp;
+		bus = pci_scan_bus(next_busno, hose->pci_ops, hose);
+		hose->bus = bus;
+		need_domain_info = need_domain_info || hose->index;
+		hose->need_domain_info = need_domain_info;
+		if (bus) {
+			next_busno = bus->subordinate + 1;
+			/* Don't allow 8-bit bus number overflow inside the hose -
+			   reserve some space for bridges. */
+			if (next_busno > 224) {
+				next_busno = 0;
+				need_domain_info = 1;
+			}
+		}
+		if (!pci_probe_only)
+			pci_assign_unassigned_resources();
+		pci_fixup_irqs(common_swizzle, pcibios_map_irq);
+	} else {
+		*hose_tail = hose;
+		hose_tail = &hose->next;
+	}
 
-	while (dev->bus->parent) {
-		pin = bridge_swizzle(pin, PCI_SLOT(dev->devfn));
-		/* Move up the chain of bridges. */
-		dev = dev->bus->self;
-        }
-	*pinp = pin;
+	return;
 
-	/* The slot is the slot of the last bridge. */
-	return PCI_SLOT(dev->devfn);
+out:
+	printk(KERN_WARNING
+	       "Skipping PCI bus scan due to resource conflict\n");
 }
 
 static int __init pcibios_init(void)
 {
 	struct pci_controller *hose;
 	struct pci_bus *bus;
-	int next_busno;
-	int need_domain_info = 0;
 
 	/* Scan all of the recorded PCI controllers.  */
 	for (next_busno = 0, hose = hose_head; hose; hose = hose->next) {
@@ -157,6 +195,7 @@ static int __init pcibios_init(void)
 	if (!pci_probe_only)
 		pci_assign_unassigned_resources();
 	pci_fixup_irqs(common_swizzle, pcibios_map_irq);
+	pcibios_init_done = 1;
 
 	return 0;
 }
Index: linux-2.6.25/drivers/ssb/main.c
===================================================================
--- linux-2.6.25.orig/drivers/ssb/main.c	2008-04-27 21:55:32.000000000 +0100
+++ linux-2.6.25/drivers/ssb/main.c	2008-04-27 21:58:31.000000000 +0100
@@ -1191,9 +1191,7 @@ static int __init ssb_modinit(void)
 /* ssb must be initialized after PCI but before the ssb drivers.
  * That means we must use some initcall between subsys_initcall
  * and device_initcall. */
-//FIXME on embedded we need to be early to make sure we can register
-//      a new PCI bus, if needed.
-subsys_initcall(ssb_modinit);
+fs_initcall(ssb_modinit);
 
 static void __exit ssb_modexit(void)
 {