Kyösti Mälkki (kyosti.malkki@gmail.com) just uploaded a new patch set to gerrit, which you can find at http://review.coreboot.org/8537
-gerrit
commit 8fddac599cc1370d5bfb059cf646c970c72c8dd9 Author: Kyösti Mälkki kyosti.malkki@gmail.com Date: Mon Feb 23 06:58:26 2015 +0200
PCI subsystem: Use subordinate property to track bus enumeration
Parameter max is the cumulative number of PCI buses scanned on the system so far. Use the property subordinate from the parent PCI bridge device to keep track of the first available bus number instead of passing that on the stack.
Change-Id: I1a884c98d50fa4f1eb2752e10b778aea8a7b090a Signed-off-by: Kyösti Mälkki kyosti.malkki@gmail.com --- src/device/pci_device.c | 29 +++++++++-------------------- 1 file changed, 9 insertions(+), 20 deletions(-)
diff --git a/src/device/pci_device.c b/src/device/pci_device.c index 7ac560b..fe03d61 100644 --- a/src/device/pci_device.c +++ b/src/device/pci_device.c @@ -1174,11 +1174,16 @@ static void pci_bridge_route(struct bus *link, scan_state state) struct bus *parent = dev->bus; u32 reg, buses = 0;
+ if (state == PCI_ROUTE_SCAN) { + link->secondary = parent->subordinate + 1; + link->subordinate = link->secondary; + } + if (state == PCI_ROUTE_CLOSE) { buses |= 0xfeff << 8; } else if (state == PCI_ROUTE_SCAN) { buses |= ((u32) link->secondary & 0xff) << 8; - buses |= ((u32) link->subordinate & 0xff) << 16; + buses |= 0xff << 16; /* MAX PCI_BUS number here */ } else if (state == PCI_ROUTE_FINAL) { buses |= parent->secondary & 0xff; buses |= ((u32) link->secondary & 0xff) << 8; @@ -1205,10 +1210,10 @@ static void pci_bridge_route(struct bus *link, scan_state state)
if (state == PCI_ROUTE_FINAL) { pci_write_config16(dev, PCI_COMMAND, link->bridge_cmd); + parent->subordinate = link->subordinate; } }
- /** * Scan a PCI bridge and the buses behind the bridge. * @@ -1244,29 +1249,13 @@ unsigned int do_pci_scan_bridge(struct device *dev, unsigned int max,
bus = dev->link_list;
- /* - * Set up the primary, secondary and subordinate bus numbers. We have - * no idea how many buses are behind this bridge yet, so we set the - * subordinate bus number to 0xff for the moment. - */ - bus->secondary = ++max; - bus->subordinate = 0xff; - pci_bridge_route(bus, PCI_ROUTE_SCAN);
- /* Now we can scan all subordinate buses (those behind the bridge). */ - max = do_scan_bus(bus, 0x00, 0xff, max); - - /* - * We know the number of buses behind this bridge. Set the subordinate - * bus number to its real value. - */ - bus->subordinate = max; + bus->subordinate = do_scan_bus(bus, 0x00, 0xff, bus->secondary);
pci_bridge_route(bus, PCI_ROUTE_FINAL);
- printk(BIOS_SPEW, "%s returns max %d\n", __func__, max); - return max; + return bus->subordinate; }
/**