Altix: Initial ACPI support - ROM shadowing.

Support a shadowed ROM when running with an ACPI capable PROM.

Define a new dev.resource flag IORESOURCE_ROM_BIOS_COPY to
describe the case of a BIOS shadowed ROM, which can then
be used to avoid pci_map_rom() making an unneeded call to
pci_enable_rom().


Signed-off-by: John Keller <jpk@sgi.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

1 files changed, 6 insertions, 3 deletions

diff --git a/drivers/pci/rom.c b/drivers/pci/rom.c
index e1dcefc69bb4..d087e0817715 100644
--- a/drivers/pci/rom.c
+++ b/drivers/pci/rom.c
@@ -81,7 +81,8 @@ void __iomem *pci_map_rom(struct pci_dev *pdev, size_t *size)
                 start = (loff_t)0xC0000;
                 *size = 0x20000; /* cover C000:0 through E000:0 */
         } else {
-                if (res->flags & IORESOURCE_ROM_COPY) {
+                if (res->flags &
+                        (IORESOURCE_ROM_COPY | IORESOURCE_ROM_BIOS_COPY)) {
                         *size = pci_resource_len(pdev, PCI_ROM_RESOURCE);
                         return (void __iomem *)(unsigned long)
                                 pci_resource_start(pdev, PCI_ROM_RESOURCE);
@@ -165,7 +166,8 @@ void __iomem *pci_map_rom_copy(struct pci_dev *pdev, size_t *size)
         if (!rom)
                 return NULL;
 
-        if (res->flags & (IORESOURCE_ROM_COPY | IORESOURCE_ROM_SHADOW))
+        if (res->flags & (IORESOURCE_ROM_COPY | IORESOURCE_ROM_SHADOW |
+                          IORESOURCE_ROM_BIOS_COPY))
                 return rom;
 
         res->start = (unsigned long)kmalloc(*size, GFP_KERNEL);
@@ -191,7 +193,7 @@ void pci_unmap_rom(struct pci_dev *pdev, void __iomem *rom)
 {
         struct resource *res = &pdev->resource[PCI_ROM_RESOURCE];
 
-        if (res->flags & IORESOURCE_ROM_COPY)
+        if (res->flags & (IORESOURCE_ROM_COPY | IORESOURCE_ROM_BIOS_COPY))
                 return;
 
         iounmap(rom);
@@ -215,6 +217,7 @@ void pci_remove_rom(struct pci_dev *pdev)
                 sysfs_remove_bin_file(&pdev->dev.kobj, pdev->rom_attr);
         if (!(res->flags & (IORESOURCE_ROM_ENABLE |
                             IORESOURCE_ROM_SHADOW |
+                            IORESOURCE_ROM_BIOS_COPY |
                             IORESOURCE_ROM_COPY)))
                 pci_disable_rom(pdev);
 }