1 files changed, 29 insertions, 0 deletions

diff --git a/arch/mips/loongson64/vbios_quirk.c b/arch/mips/loongson64/vbios_quirk.c
new file mode 100644
index 000000000..9a29e94d3
--- /dev/null
+++ b/arch/mips/loongson64/vbios_quirk.c
@@ -0,0 +1,29 @@
+// SPDX-License-Identifier: GPL-2.0+
+
+#include <linux/pci.h>
+#include <loongson.h>
+
+static void pci_fixup_radeon(struct pci_dev *pdev)
+{
+        struct resource *res = &pdev->resource[PCI_ROM_RESOURCE];
+
+        if (res->start)
+                return;
+
+        if (!loongson_sysconf.vgabios_addr)
+                return;
+
+        pci_disable_rom(pdev);
+        if (res->parent)
+                release_resource(res);
+
+        res->start = virt_to_phys((void *) loongson_sysconf.vgabios_addr);
+        res->end   = res->start + 256*1024 - 1;
+        res->flags = IORESOURCE_MEM | IORESOURCE_ROM_SHADOW |
+                     IORESOURCE_PCI_FIXED;
+
+        dev_info(&pdev->dev, "BAR %d: assigned %pR for Radeon ROM\n",
+                 PCI_ROM_RESOURCE, res);
+}
+DECLARE_PCI_FIXUP_CLASS_FINAL(PCI_VENDOR_ID_ATI, 0x9615,
+                                PCI_CLASS_DISPLAY_VGA, 8, pci_fixup_radeon);