[PATCH v7 19/31] powerpc/pci: Use pci_scan_host_bridge() for simplicity

[PATCH v7 19/31] powerpc/pci: Use pci_scan_host_bridge() for simplicity

[Yijing Wang]

Now we could use pci_scan_host_bridge() to scan
pci buses, provide powerpc specific pci_host_bridge_ops.

Signed-off-by: Yijing Wang <wangyijing@huawei.com>
CC: Benjamin Herrenschmidt <benh@kernel.crashing.org>
CC: linuxppc-dev@lists.ozlabs.org
---
 arch/powerpc/kernel/pci-common.c |   60 +++++++++++++++++++++++--------------
 1 files changed, 37 insertions(+), 23 deletions(-)

diff --git a/arch/powerpc/kernel/pci-common.c b/arch/powerpc/kernel/pci-common.c
index 2c58200..e2b50a2 100644
--- a/arch/powerpc/kernel/pci-common.c
+++ b/arch/powerpc/kernel/pci-common.c
@@ -773,6 +773,29 @@ void pcibios_set_root_bus_speed(struct pci_host_bridge *bridge)
 		return ppc_md.pcibios_set_root_bus_speed(bridge);
 }
 
+static int pci_host_scan_bus(struct pci_host_bridge *host)
+{
+	int mode = PCI_PROBE_NORMAL;
+	struct pci_bus *bus = host->bus;
+	struct pci_controller *hose = dev_get_drvdata(&host->dev);
+
+	/* Get probe mode and perform scan */
+	if (hose->dn && ppc_md.pci_probe_mode)
+		mode = ppc_md.pci_probe_mode(bus);
+
+	pr_debug("    probe mode: %d\n", mode);
+	if (mode == PCI_PROBE_DEVTREE)
+		of_scan_bus(hose->dn, bus);
+
+	if (mode == PCI_PROBE_NORMAL) {
+		pci_bus_update_busn_res_end(bus, 255);
+		hose->last_busno = pci_scan_child_bus(bus);
+		pci_bus_update_busn_res_end(bus, hose->last_busno);
+	}
+
+	return pci_bus_child_max_busnr(bus);
+}
+
 /* This header fixup will do the resource fixup for all devices as they are
  * probed, but not for bridge ranges
  */
@@ -1585,6 +1608,11 @@ struct device_node *pcibios_get_phb_of_node(struct pci_bus *bus)
 	return of_node_get(hose->dn);
 }
 
+static struct pci_host_bridge_ops pci_host_ops = {
+	.set_root_bus_speed = pcibios_set_root_bus_speed,
+	.scan_bus = pci_host_scan_bus,
+};
+
 /**
  * pci_scan_phb - Given a pci_controller, setup and scan the PCI bus
  * @hose: Pointer to the PCI host controller instance structure
@@ -1592,9 +1620,8 @@ struct device_node *pcibios_get_phb_of_node(struct pci_bus *bus)
 void pcibios_scan_phb(struct pci_controller *hose)
 {
 	LIST_HEAD(resources);
-	struct pci_bus *bus;
+	struct pci_host_bridge *host;
 	struct device_node *node = hose->dn;
-	int mode;
 
 	pr_debug("PCI: Scanning PHB %s\n", of_node_full_name(node));
 
@@ -1609,31 +1636,18 @@ void pcibios_scan_phb(struct pci_controller *hose)
 	hose->busn.flags = IORESOURCE_BUS;
 	pci_add_resource(&resources, &hose->busn);
 
+	pci_host_ops.pci_ops = hose->ops;
 	/* Create an empty bus for the toplevel */
-	bus = pci_create_root_bus(hose->parent, hose->global_number,
-			hose->first_busno, hose->ops, hose, &resources);
-	if (bus == NULL) {
-		pr_err("Failed to create bus for PCI domain %04x\n",
-			hose->global_number);
+	host = pci_scan_host_bridge(hose->parent, hose->global_number,
+			hose->first_busno, hose, &resources, &pci_host_ops);
+	if (host == NULL) {
+		pr_err("Failed to create host bridge for pci%04x:%02x\n",
+			hose->global_number, hose->first_busno);
 		pci_free_resource_list(&resources);
 		return;
 	}
 	hose->bus = bus;
 
-	/* Get probe mode and perform scan */
-	mode = PCI_PROBE_NORMAL;
-	if (node && ppc_md.pci_probe_mode)
-		mode = ppc_md.pci_probe_mode(bus);
-	pr_debug("    probe mode: %d\n", mode);
-	if (mode == PCI_PROBE_DEVTREE)
-		of_scan_bus(node, bus);
-
-	if (mode == PCI_PROBE_NORMAL) {
-		pci_bus_update_busn_res_end(bus, 255);
-		hose->last_busno = pci_scan_child_bus(bus);
-		pci_bus_update_busn_res_end(bus, hose->last_busno);
-	}
-
 	/* Platform gets a chance to do some global fixups before
 	 * we proceed to resource allocation
 	 */
@@ -1641,9 +1655,9 @@ void pcibios_scan_phb(struct pci_controller *hose)
 		ppc_md.pcibios_fixup_phb(hose);
 
 	/* Configure PCI Express settings */
-	if (bus && !pci_has_flag(PCI_PROBE_ONLY)) {
+	if (host->bus && !pci_has_flag(PCI_PROBE_ONLY)) {
 		struct pci_bus *child;
-		list_for_each_entry(child, &bus->children, node)
+		list_for_each_entry(child, &host->bus->children, node)
 			pcie_bus_configure_settings(child);
 	}
 }
-- 
1.7.1