From 842de40d93e00a5c40a1a7f520a6fbe422994e99 Mon Sep 17 00:00:00 2001 From: Bjorn Helgaas Date: Tue, 4 Mar 2008 11:56:47 -0700 Subject: PCI: add generic pci_enable_resources() Each architecture has its own pcibios_enable_resources() implementation. These differ in many minor ways that have nothing to do with actual architectural differences. Follow-on patches will make most arches use this generic version instead. This version is based on powerpc, which seemed most up-to-date. The only functional difference from the x86 version is that this uses "!r->parent" to check for resource collisions instead of "!r->start && r->end". Signed-off-by: Bjorn Helgaas Acked-by: Benjamin Herrenschmidt Acked-by: David Howells Signed-off-by: Greg Kroah-Hartman --- drivers/pci/setup-res.c | 43 +++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 43 insertions(+) (limited to 'drivers/pci/setup-res.c') diff --git a/drivers/pci/setup-res.c b/drivers/pci/setup-res.c index 9e4d485ba9c..bad509e40fb 100644 --- a/drivers/pci/setup-res.c +++ b/drivers/pci/setup-res.c @@ -263,3 +263,46 @@ void pdev_sort_resources(struct pci_dev *dev, struct resource_list *head) } } } + +int pci_enable_resources(struct pci_dev *dev, int mask) +{ + u16 cmd, old_cmd; + int i; + struct resource *r; + + pci_read_config_word(dev, PCI_COMMAND, &cmd); + old_cmd = cmd; + + for (i = 0; i < PCI_NUM_RESOURCES; i++) { + if (!(mask & (1 << i))) + continue; + + r = &dev->resource[i]; + + if (!(r->flags & (IORESOURCE_IO | IORESOURCE_MEM))) + continue; + if ((i == PCI_ROM_RESOURCE) && + (!(r->flags & IORESOURCE_ROM_ENABLE))) + continue; + + if (!r->parent) { + dev_err(&dev->dev, "device not available because of " + "BAR %d [%llx:%llx] collisions\n", i, + (unsigned long long) r->start, + (unsigned long long) r->end); + return -EINVAL; + } + + if (r->flags & IORESOURCE_IO) + cmd |= PCI_COMMAND_IO; + if (r->flags & IORESOURCE_MEM) + cmd |= PCI_COMMAND_MEMORY; + } + + if (cmd != old_cmd) { + dev_info(&dev->dev, "enabling device (%04x -> %04x)\n", + old_cmd, cmd); + pci_write_config_word(dev, PCI_COMMAND, cmd); + } + return 0; +} -- cgit v1.2.3