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authorBjorn Helgaas <bjorn.helgaas@hp.com>2008-03-04 13:56:47 -0500
committerGreg Kroah-Hartman <gregkh@suse.de>2008-04-21 00:47:04 -0400
commit842de40d93e00a5c40a1a7f520a6fbe422994e99 (patch)
treeec59fd64804a4f5cde40f5edf43fabd5ddb3c413 /drivers
parent7d715a6c1ae5785d00fb9a876b5abdfc43abc44b (diff)
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 <bjorn.helgaas@hp.com> Acked-by: Benjamin Herrenschmidt <benh@kernel.crashing.org> Acked-by: David Howells <dhowells@redhat.com> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'drivers')
-rw-r--r--drivers/pci/setup-res.c43
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)
263 } 263 }
264 } 264 }
265} 265}
266
267int pci_enable_resources(struct pci_dev *dev, int mask)
268{
269 u16 cmd, old_cmd;
270 int i;
271 struct resource *r;
272
273 pci_read_config_word(dev, PCI_COMMAND, &cmd);
274 old_cmd = cmd;
275
276 for (i = 0; i < PCI_NUM_RESOURCES; i++) {
277 if (!(mask & (1 << i)))
278 continue;
279
280 r = &dev->resource[i];
281
282 if (!(r->flags & (IORESOURCE_IO | IORESOURCE_MEM)))
283 continue;
284 if ((i == PCI_ROM_RESOURCE) &&
285 (!(r->flags & IORESOURCE_ROM_ENABLE)))
286 continue;
287
288 if (!r->parent) {
289 dev_err(&dev->dev, "device not available because of "
290 "BAR %d [%llx:%llx] collisions\n", i,
291 (unsigned long long) r->start,
292 (unsigned long long) r->end);
293 return -EINVAL;
294 }
295
296 if (r->flags & IORESOURCE_IO)
297 cmd |= PCI_COMMAND_IO;
298 if (r->flags & IORESOURCE_MEM)
299 cmd |= PCI_COMMAND_MEMORY;
300 }
301
302 if (cmd != old_cmd) {
303 dev_info(&dev->dev, "enabling device (%04x -> %04x)\n",
304 old_cmd, cmd);
305 pci_write_config_word(dev, PCI_COMMAND, cmd);
306 }
307 return 0;
308}