[PATCH v8 19/30] powerpc/pci: Use pci_scan_host_bridge() for simplicity

Yijing Wang
2015-03-24T03:34:13Z

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