Commit 842de40d authored by Bjorn Helgaas's avatar Bjorn Helgaas Committed by Greg Kroah-Hartman
Browse files

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: default avatarBjorn Helgaas <bjorn.helgaas@hp.com>
Acked-by: default avatarBenjamin Herrenschmidt <benh@kernel.crashing.org>
Acked-by: default avatarDavid Howells <dhowells@redhat.com>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@suse.de>
parent 7d715a6c

drivers/pci/setup-res.c

+43 −0
Original line number Diff line number Diff line
@@ -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;

}

include/linux/pci.h

+1 −0
Original line number Diff line number Diff line
@@ -624,6 +624,7 @@ int pci_claim_resource(struct pci_dev *, int); 
void pci_assign_unassigned_resources(void);

void pdev_enable_device(struct pci_dev *);

void pdev_sort_resources(struct pci_dev *, struct resource_list *);

int pci_enable_resources(struct pci_dev *, int mask);

void pci_fixup_irqs(u8 (*)(struct pci_dev *, u8 *),

		    int (*)(struct pci_dev *, u8, u8));

#define HAVE_PCI_REQ_REGIONS	2

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