From b435261b1e09bb2bb6acc4abbc7f6e3d885f9e62 Mon Sep 17 00:00:00 2001 From: Bernhard Kaindl Date: Tue, 30 May 2006 18:00:34 +0200 Subject: [PATCH] yenta: fix hidden PCI bus numbers Fixup the subordinate number parent bridge of yenta Cardbus Bridges before the PCI bus scan starts to make the cardbus cards which are otherwise hidden for PCI scans work. Signed-off-by: Bernhard Kaindl Signed-off-by: Dominik Brodowski --- drivers/pcmcia/yenta_socket.c | 73 +++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 73 insertions(+) (limited to 'drivers/pcmcia') diff --git a/drivers/pcmcia/yenta_socket.c b/drivers/pcmcia/yenta_socket.c index 006749dc8d7..d9d005ec920 100644 --- a/drivers/pcmcia/yenta_socket.c +++ b/drivers/pcmcia/yenta_socket.c @@ -1005,6 +1005,77 @@ static void yenta_config_init(struct yenta_socket *socket) config_writew(socket, CB_BRIDGE_CONTROL, bridge); } +/** + * yenta_fixup_parent_subordinate - Fix subordinate bus# of the parent bridge + * @cardbus_bridge: The PCI bus which the CardBus bridge bridges to + * + * Checks if devices on the bus which the CardBus bridge bridges to would be + * invisible during PCI scans because of a misconfigured subordinate number + * of the parent brige - some BIOSes seem to be too lazy to set it right. + * Does the fixup carefully by checking how far it can go without conflicts. + * See http://bugzilla.kernel.org/show_bug.cgi?id=2944 for more information. + */ +static void yenta_fixup_parent_bridge(struct pci_bus *cardbus_bridge) +{ + struct list_head *tmp; + unsigned char upper_limit; + /* + * We only check and fix the parent bridge: All systems which need + * this fixup that have been reviewed are laptops and the only bridge + * which needed fixing was the parent bridge of the CardBus bridge: + */ + struct pci_bus *bridge_to_fix = cardbus_bridge->parent; + + /* Check bus numbers are already set up correctly: */ + if (bridge_to_fix->subordinate >= cardbus_bridge->subordinate) + return; /* The subordinate number is ok, nothing to do */ + + if (!bridge_to_fix->parent) + return; /* Root bridges are ok */ + + /* stay within the limits of the bus range of the parent: */ + upper_limit = bridge_to_fix->parent->subordinate; + + /* check the bus ranges of all silbling bridges to prevent overlap */ + list_for_each(tmp, &bridge_to_fix->parent->children) { + struct pci_bus * silbling = pci_bus_b(tmp); + /* + * If the silbling has a higher secondary bus number + * and it's secondary is equal or smaller than our + * current upper limit, set the new upper limit to + * the bus number below the silbling's range: + */ + if (silbling->secondary > bridge_to_fix->subordinate + && silbling->secondary <= upper_limit) + upper_limit = silbling->secondary - 1; + } + + /* Show that the wanted subordinate number is not possible: */ + if (cardbus_bridge->subordinate > upper_limit) + printk(KERN_WARNING "Yenta: Upper limit for fixing this " + "bridge's parent bridge: #%02x\n", upper_limit); + + /* If we have room to increase the bridge's subordinate number, */ + if (bridge_to_fix->subordinate < upper_limit) { + + /* use the highest number of the hidden bus, within limits */ + unsigned char subordinate_to_assign = + min(cardbus_bridge->subordinate, upper_limit); + + printk(KERN_INFO "Yenta: Raising subordinate bus# of parent " + "bus (#%02x) from #%02x to #%02x\n", + bridge_to_fix->number, + bridge_to_fix->subordinate, subordinate_to_assign); + + /* Save the new subordinate in the bus struct of the bridge */ + bridge_to_fix->subordinate = subordinate_to_assign; + + /* and update the PCI config space with the new subordinate */ + pci_write_config_byte(bridge_to_fix->self, + PCI_SUBORDINATE_BUS, bridge_to_fix->subordinate); + } +} + /* * Initialize a cardbus controller. Make sure we have a usable * interrupt, and that we can map the cardbus area. Fill in the @@ -1120,6 +1191,8 @@ static int __devinit yenta_probe (struct pci_dev *dev, const struct pci_device_i yenta_get_socket_capabilities(socket, isa_interrupts); printk(KERN_INFO "Socket status: %08x\n", cb_readl(socket, CB_SOCKET_STATE)); + yenta_fixup_parent_bridge(dev->subordinate); + /* Register it with the pcmcia layer.. */ ret = pcmcia_register_socket(&socket->socket); if (ret == 0) { -- cgit v1.2.3