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[PATCH] Fix PCI ROM mapping 

This fixes a problem with pci_map_rom() which doesn't properly
update the ROM BAR value with the address thas allocated for it by the
PCI code. This problem, among other, breaks boot on Mac laptops.

It'ss a new version based on Linus latest one with better error
checking.

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Benjamin Herrenschmidt 2005-08-31 14:16:53 +10:00 committed by Linus Torvalds
parent 319e76a1ae
commit 8085ce084c
1 changed files with 17 additions and 7 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

24
drivers/pci/rom.c
View File

@ -21,13 +21,21 @@
* between the ROM and other resources, so enabling it may disable access
* to MMIO registers or other card memory.
*/
static void pci_enable_rom(struct pci_dev *pdev)
static int pci_enable_rom(struct pci_dev *pdev)
{
struct resource *res = pdev->resource + PCI_ROM_RESOURCE;
struct pci_bus_region region;
u32 rom_addr;
if (!res->flags)
return -1;
pcibios_resource_to_bus(pdev, &region, res);
pci_read_config_dword(pdev, pdev->rom_base_reg, &rom_addr);
rom_addr |= PCI_ROM_ADDRESS_ENABLE;
rom_addr &= ~PCI_ROM_ADDRESS_MASK;
rom_addr |= region.start | PCI_ROM_ADDRESS_ENABLE;
pci_write_config_dword(pdev, pdev->rom_base_reg, rom_addr);
return 0;
}
/**
@ -71,19 +79,21 @@ void __iomem *pci_map_rom(struct pci_dev *pdev, size_t *size)
} else {
if (res->flags & IORESOURCE_ROM_COPY) {
*size = pci_resource_len(pdev, PCI_ROM_RESOURCE);
return (void __iomem *)pci_resource_start(pdev, PCI_ROM_RESOURCE);
return (void __iomem *)pci_resource_start(pdev,
PCI_ROM_RESOURCE);
} else {
/* assign the ROM an address if it doesn't have one */
if (res->parent == NULL)
pci_assign_resource(pdev, PCI_ROM_RESOURCE);
if (res->parent == NULL &&
pci_assign_resource(pdev,PCI_ROM_RESOURCE))
return NULL;
start = pci_resource_start(pdev, PCI_ROM_RESOURCE);
*size = pci_resource_len(pdev, PCI_ROM_RESOURCE);
if (*size == 0)
return NULL;
/* Enable ROM space decodes */
pci_enable_rom(pdev);
if (pci_enable_rom(pdev))
return NULL;
}
}