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Allow registering PCI devices after early boot.
This is an ugly hack and needs to be rewritten before going upstream.
Index: linux-2.6.23.16/arch/mips/pci/pci.c
===================================================================
--- linux-2.6.23.16.orig/arch/mips/pci/pci.c 2008-02-20 16:06:36.000000000 +0100
+++ linux-2.6.23.16/arch/mips/pci/pci.c 2008-02-20 16:09:33.000000000 +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-2.6.23.16/drivers/ssb/main.c
===================================================================
--- linux-2.6.23.16.orig/drivers/ssb/main.c 2008-02-20 16:06:36.000000000 +0100
+++ linux-2.6.23.16/drivers/ssb/main.c 2008-02-20 18:33:21.000000000 +0100
@@ -1185,9 +1185,7 @@ 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)
{
|
