Commit 4708f9a5 authored by Bjorn Helgaas's avatar Bjorn Helgaas
Browse files

PCI: Don't enable/disable ROM BAR if we're using a RAM shadow copy 



If we're using a RAM shadow copy instead of the ROM BAR, we don't need to
touch the ROM BAR enable bit.

Signed-off-by: default avatarBjorn Helgaas <bhelgaas@google.com>
parent 2ea4adf7

drivers/pci/rom.c

+12 −4
Original line number Diff line number Diff line
@@ -24,13 +24,17 @@ 
 */

int pci_enable_rom(struct pci_dev *pdev)

{

	struct resource *res = pdev->resource + PCI_ROM_RESOURCE;

	struct resource *res = &pdev->resource[PCI_ROM_RESOURCE];

	struct pci_bus_region region;

	u32 rom_addr;



	if (!res->flags)

		return -1;



	/* Nothing to enable if we're using a shadow copy in RAM */

	if (res->flags & IORESOURCE_ROM_SHADOW)

		return 0;



	pcibios_resource_to_bus(pdev->bus, &region, res);

	pci_read_config_dword(pdev, pdev->rom_base_reg, &rom_addr);

	rom_addr &= ~PCI_ROM_ADDRESS_MASK;
@@ -49,7 +53,12 @@ EXPORT_SYMBOL_GPL(pci_enable_rom); 
 */

void pci_disable_rom(struct pci_dev *pdev)

{

	struct resource *res = &pdev->resource[PCI_ROM_RESOURCE];

	u32 rom_addr;



	if (res->flags & IORESOURCE_ROM_SHADOW)

		return;



	pci_read_config_dword(pdev, pdev->rom_base_reg, &rom_addr);

	rom_addr &= ~PCI_ROM_ADDRESS_ENABLE;

	pci_write_config_dword(pdev, pdev->rom_base_reg, rom_addr);
@@ -154,7 +163,6 @@ void __iomem *pci_map_rom(struct pci_dev *pdev, size_t *size) 
	if (!rom) {

		/* restore enable if ioremap fails */

		if (!(res->flags & (IORESOURCE_ROM_ENABLE |

				    IORESOURCE_ROM_SHADOW |

				    IORESOURCE_ROM_COPY)))

			pci_disable_rom(pdev);

		return NULL;
@@ -186,8 +194,8 @@ void pci_unmap_rom(struct pci_dev *pdev, void __iomem *rom) 


	iounmap(rom);



	/* Disable again before continuing, leave enabled if pci=rom */

	if (!(res->flags & (IORESOURCE_ROM_ENABLE | IORESOURCE_ROM_SHADOW)))

	/* Disable again before continuing */

	if (!(res->flags & IORESOURCE_ROM_ENABLE))

		pci_disable_rom(pdev);

}

EXPORT_SYMBOL(pci_unmap_rom);