Messages in this thread Patch in this message | | | Subject | Re: Ignore disabled ROM resources at setup | From | Benjamin Herrenschmidt <> | Date | Wed, 31 Aug 2005 14:16:53 +1000 |
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Here's a new patch based on Linus latest one with better error checking. Please push if you are fine with it.
This patch 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.
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Index: linux-work/drivers/pci/rom.c =================================================================== --- linux-work.orig/drivers/pci/rom.c 2005-08-01 22:03:44.000000000 +1000 +++ linux-work/drivers/pci/rom.c 2005-08-31 14:09:02.000000000 +1000 @@ -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, ®ion, 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 @@ } 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; } }
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