nouveau: Attempt to use platform-provided ROM image

Some platforms only provide their PCI ROM via a platform-specific interface.
Fall back to attempting that if all other sources fail.

Signed-off-by: Matthew Garrett <matthew.garrett@nebula.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>

diff --git a/drivers/gpu/drm/nouveau/core/subdev/bios/base.c b/drivers/gpu/drm/nouveau/core/subdev/bios/base.c
index e816f06..0e2c1a4 100644 (file)
--- a/drivers/gpu/drm/nouveau/core/subdev/bios/base.c
+++ b/drivers/gpu/drm/nouveau/core/subdev/bios/base.c
@@ -248,6 +248,22 @@ nouveau_bios_shadow_pci(struct nouveau_bios *bios)
        }
 }
 
+static void
+nouveau_bios_shadow_platform(struct nouveau_bios *bios)
+{
+       struct pci_dev *pdev = nv_device(bios)->pdev;
+       size_t size;
+
+       void __iomem *rom = pci_platform_rom(pdev, &size);
+       if (rom && size) {
+               bios->data = kmalloc(size, GFP_KERNEL);
+               if (bios->data) {
+                       memcpy_fromio(bios->data, rom, size);
+                       bios->size = size;
+               }
+       }
+}
+
 static int
 nouveau_bios_score(struct nouveau_bios *bios, const bool writeable)
 {
@@ -288,6 +304,7 @@ nouveau_bios_shadow(struct nouveau_bios *bios)
                { "PROM", nouveau_bios_shadow_prom, false, 0, 0, NULL },
                { "ACPI", nouveau_bios_shadow_acpi, true, 0, 0, NULL },
                { "PCIROM", nouveau_bios_shadow_pci, true, 0, 0, NULL },
+               { "PLATFORM", nouveau_bios_shadow_platform, true, 0, 0, NULL },
                {}
        };
        struct methods *mthd, *best;