ret = -EIO;
goto out_free;
}
- ast->ioregs = pci_iomap(dev->pdev, 2, 0);
+
+ /*
+ * If we don't have IO space at all, use MMIO now and
+ * assume the chip has MMIO enabled by default (rev 0x20
+ * and higher).
+ */
+ if (!(pci_resource_flags(dev->pdev, 2) & IORESOURCE_IO)) {
+ DRM_INFO("platform has no IO space, trying MMIO\n");
+ ast->ioregs = ast->regs + AST_IO_MM_OFFSET;
+ }
+
+ /* "map" IO regs if the above hasn't done so already */
if (!ast->ioregs) {
- ret = -EIO;
- goto out_free;
+ ast->ioregs = pci_iomap(dev->pdev, 2, 0);
+ if (!ast->ioregs) {
+ ret = -EIO;
+ goto out_free;
+ }
}
ast_detect_chip(dev);