diff options
Diffstat (limited to 'drivers/pci')
| -rw-r--r-- | drivers/pci/setup-res.c | 43 |
1 files changed, 43 insertions, 0 deletions
diff --git a/drivers/pci/setup-res.c b/drivers/pci/setup-res.c index 9e4d485ba9cd..bad509e40fbc 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; +} |