[SPARC64]: More SUN4V PCI work.

Get bus range from child of PCI controller root nexus.
This is actually a hack, but the PCI-E bridge sitting
at the top of the PCI tree responds to PCI config cycles
for every device number, so best to just ignore it for now.

Preliminary PCI irq routing, needs lots of work.
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

arch/sparc64/kernel/pci_sun4v.c

@@ -538,6 +538,12 @@ static int pci_sun4v_read_pci_cfg(struct pci_bus *bus_dev, unsigned int devfn,
 		ret = pci_sun4v_config_get(devhandle,
 				HV_PCI_DEVICE_BUILD(bus, device, func),
 				where, size);
+#if 0
+		printk("read_pci_cfg: devh[%x] device[%08x] where[%x] sz[%d] "
+		       "== [%016lx]\n",
+		       devhandle, HV_PCI_DEVICE_BUILD(bus, device, func),
+		       where, size, ret);
+#endif
 	}
 	switch (size) {
 	case 1:
@@ -571,6 +577,12 @@ static int pci_sun4v_write_pci_cfg(struct pci_bus *bus_dev, unsigned int devfn,
 		ret = pci_sun4v_config_put(devhandle,
 				HV_PCI_DEVICE_BUILD(bus, device, func),
 				where, size, value);
+#if 0
+		printk("write_pci_cfg: devh[%x] device[%08x] where[%x] sz[%d] "
+		       "val[%08x] == [%016lx]\n",
+		       devhandle, HV_PCI_DEVICE_BUILD(bus, device, func),
+		       where, size, value, ret);
+#endif
 	}
 	return PCIBIOS_SUCCESSFUL;
 }
@@ -598,10 +610,13 @@ static void pbm_scan_bus(struct pci_controller_info *p,
 	pbm->pci_bus = pci_scan_bus(pbm->pci_first_busno,
 				    p->pci_ops,
 				    pbm);
+#if 0
 	pci_fixup_host_bridge_self(pbm->pci_bus);
 	pbm->pci_bus->self->sysdata = cookie;
+#endif
 
-	pci_fill_in_pbm_cookies(pbm->pci_bus, pbm, pbm->prom_node);
+	pci_fill_in_pbm_cookies(pbm->pci_bus, pbm,
+				prom_getchild(pbm->prom_node));
 	pci_record_assignments(pbm, pbm->pci_bus);
 	pci_assign_unassigned(pbm, pbm->pci_bus);
 	pci_fixup_irq(pbm, pbm->pci_bus);
@@ -631,8 +646,65 @@ static unsigned int pci_sun4v_irq_build(struct pci_pbm_info *pbm,
 					struct pci_dev *pdev,
 					unsigned int ino)
 {
-	/* XXX Implement me! XXX */
-	return 0;
+	struct ino_bucket *bucket;
+	unsigned long sysino;
+	u32 devhandle = pbm->devhandle;
+	int pil;
+
+	sysino = sun4v_devino_to_sysino(devhandle, ino);
+
+	printk(KERN_INFO "pci_irq_buld: Mapping ( devh[%08x] ino[%08x] ) "
+	       "--> sysino[%016lx]\n", devhandle, ino, sysino);
+
+	pil = 4;
+	if (pdev) {
+		switch ((pdev->class >> 16) & 0xff) {
+		case PCI_BASE_CLASS_STORAGE:
+			pil = 4;
+			break;
+
+		case PCI_BASE_CLASS_NETWORK:
+			pil = 6;
+			break;
+
+		case PCI_BASE_CLASS_DISPLAY:
+			pil = 9;
+			break;
+
+		case PCI_BASE_CLASS_MULTIMEDIA:
+		case PCI_BASE_CLASS_MEMORY:
+		case PCI_BASE_CLASS_BRIDGE:
+		case PCI_BASE_CLASS_SERIAL:
+			pil = 10;
+			break;
+
+		default:
+			pil = 4;
+			break;
+		};
+	}
+	BUG_ON(PIL_RESERVED(pil));
+
+	bucket = &ivector_table[sysino];
+
+	/* Catch accidental accesses to these things.  IMAP/ICLR handling
+	 * is done by hypervisor calls on sun4v platforms, not by direct
+	 * register accesses.
+	 */
+	bucket->imap = ~0UL;
+	bucket->iclr = ~0UL;
+
+	bucket->pil = pil;
+	bucket->flags = IBF_PCI;
+
+	bucket->irq_info = kmalloc(sizeof(struct irq_desc), GFP_ATOMIC);
+	if (!bucket->irq_info) {
+		prom_printf("IRQ: Error, kmalloc(irq_desc) failed.\n");
+		prom_halt();
+	}
+	memset(bucket->irq_info, 0, sizeof(struct irq_desc));
+
+	return __irq(bucket);
 }
 
 static void pci_sun4v_base_address_update(struct pci_dev *pdev, int resource)
@@ -834,10 +906,35 @@ static void pci_sun4v_iommu_init(struct pci_pbm_info *pbm)
 	probe_existing_entries(pbm, iommu);
 }
 
+/* Don't get this from the root nexus, get it from the "pci@0" node below.  */
+static void pci_sun4v_get_bus_range(struct pci_pbm_info *pbm)
+{
+	unsigned int busrange[2];
+	int prom_node = pbm->prom_node;
+	int err;
+
+	prom_node = prom_getchild(prom_node);
+	if (prom_node == 0) {
+		prom_printf("%s: Fatal error, no child OBP node.\n", pbm->name);
+		prom_halt();
+	}
+
+	err = prom_getproperty(prom_node, "bus-range",
+			       (char *)&busrange[0],
+			       sizeof(busrange));
+	if (err == 0 || err == -1) {
+		prom_printf("%s: Fatal error, no bus-range.\n", pbm->name);
+		prom_halt();
+	}
+
+	pbm->pci_first_busno = busrange[0];
+	pbm->pci_last_busno = busrange[1];
+
+}
+
 static void pci_sun4v_pbm_init(struct pci_controller_info *p, int prom_node, unsigned int devhandle)
 {
 	struct pci_pbm_info *pbm;
-	unsigned int busrange[2];
 	int err, i;
 
 	if (devhandle & 0x40)
@@ -898,16 +995,7 @@ static void pci_sun4v_pbm_init(struct pci_controller_info *p, int prom_node, uns
 		memset(&pbm->pbm_intmask, 0, sizeof(pbm->pbm_intmask));
 	}
 
-	err = prom_getproperty(prom_node, "bus-range",
-			       (char *)&busrange[0],
-			       sizeof(busrange));
-	if (err == 0 || err == -1) {
-		prom_printf("%s: Fatal error, no bus-range.\n", pbm->name);
-		prom_halt();
-	}
-	pbm->pci_first_busno = busrange[0];
-	pbm->pci_last_busno = busrange[1];
-
+	pci_sun4v_get_bus_range(pbm);
 	pci_sun4v_iommu_init(pbm);
 }