Commit 84c1b80e authored by Matthew Garrett's avatar Matthew Garrett Committed by Bjorn Helgaas

PCI: Add support for non-BAR ROMs

Platforms may provide their own mechanisms for obtaining ROMs. Add support
for using data provided by the platform in that case.
Signed-off-by: default avatarMatthew Garrett <mjg@redhat.com>
Signed-off-by: default avatarBjorn Helgaas <bhelgaas@google.com>
Tested-by: default avatarSeth Forshee <seth.forshee@canonical.com>
parent eca0d467
......@@ -117,12 +117,18 @@ void __iomem *pci_map_rom(struct pci_dev *pdev, size_t *size)
loff_t start;
void __iomem *rom;
/*
* Some devices may provide ROMs via a source other than the BAR
*/
if (pdev->rom && pdev->romlen) {
*size = pdev->romlen;
return phys_to_virt((phys_addr_t)pdev->rom);
/*
* IORESOURCE_ROM_SHADOW set on x86, x86_64 and IA64 supports legacy
* memory map if the VGA enable bit of the Bridge Control register is
* set for embedded VGA.
*/
if (res->flags & IORESOURCE_ROM_SHADOW) {
} else if (res->flags & IORESOURCE_ROM_SHADOW) {
/* primary video rom always starts here */
start = (loff_t)0xC0000;
*size = 0x20000; /* cover C000:0 through E000:0 */
......@@ -181,7 +187,8 @@ void pci_unmap_rom(struct pci_dev *pdev, void __iomem *rom)
if (res->flags & (IORESOURCE_ROM_COPY | IORESOURCE_ROM_BIOS_COPY))
return;
iounmap(rom);
if (!pdev->rom || !pdev->romlen)
iounmap(rom);
/* Disable again before continuing, leave enabled if pci=rom */
if (!(res->flags & (IORESOURCE_ROM_ENABLE | IORESOURCE_ROM_SHADOW)))
......
......@@ -333,6 +333,8 @@ struct pci_dev {
};
struct pci_ats *ats; /* Address Translation Service */
#endif
void *rom; /* Physical pointer to ROM if it's not from the BAR */
size_t romlen; /* Length of ROM if it's not from the BAR */
};
static inline struct pci_dev *pci_physfn(struct pci_dev *dev)
......
Markdown is supported
0%
or
You are about to add 0 people to the discussion. Proceed with caution.
Finish editing this message first!
Please register or to comment