drm: Add support for platform devices to register as DRM devices

Allow platform devices without PCI resources to be DRM devices.

[airlied: fixup warnings with dev pointers]

Signed-off-by: Jordan Crouse <jcrouse@codeaurora.org>
Signed-off-by: Dave Airlie <airlied@redhat.com>

1 files changed, 143 insertions, 0 deletions

diff --git a/drivers/gpu/drm/drm_pci.c b/drivers/gpu/drm/drm_pci.c
index 2ea9ad4a8d69..e20f78b542a7 100644
--- a/drivers/gpu/drm/drm_pci.c
+++ b/drivers/gpu/drm/drm_pci.c
@@ -124,4 +124,147 @@ void drm_pci_free(struct drm_device * dev, drm_dma_handle_t * dmah)
 
 EXPORT_SYMBOL(drm_pci_free);
 
+#ifdef CONFIG_PCI
+/**
+ * Register.
+ *
+ * \param pdev - PCI device structure
+ * \param ent entry from the PCI ID table with device type flags
+ * \return zero on success or a negative number on failure.
+ *
+ * Attempt to gets inter module "drm" information. If we are first
+ * then register the character device and inter module information.
+ * Try and register, if we fail to register, backout previous work.
+ */
+int drm_get_pci_dev(struct pci_dev *pdev, const struct pci_device_id *ent,
+		    struct drm_driver *driver)
+{
+	struct drm_device *dev;
+	int ret;
+
+	DRM_DEBUG("\n");
+
+	dev = kzalloc(sizeof(*dev), GFP_KERNEL);
+	if (!dev)
+		return -ENOMEM;
+
+	ret = pci_enable_device(pdev);
+	if (ret)
+		goto err_g1;
+
+	pci_set_master(pdev);
+
+	dev->pdev = pdev;
+	dev->dev = &pdev->dev;
+
+	dev->pci_device = pdev->device;
+	dev->pci_vendor = pdev->vendor;
+
+#ifdef __alpha__
+	dev->hose = pdev->sysdata;
+#endif
+
+	if ((ret = drm_fill_in_dev(dev, ent, driver))) {
+		printk(KERN_ERR "DRM: Fill_in_dev failed.\n");
+		goto err_g2;
+	}
+
+	if (drm_core_check_feature(dev, DRIVER_MODESET)) {
+		pci_set_drvdata(pdev, dev);
+		ret = drm_get_minor(dev, &dev->control, DRM_MINOR_CONTROL);
+		if (ret)
+			goto err_g2;
+	}
+
+	if ((ret = drm_get_minor(dev, &dev->primary, DRM_MINOR_LEGACY)))
+		goto err_g3;
+
+	if (dev->driver->load) {
+		ret = dev->driver->load(dev, ent->driver_data);
+		if (ret)
+			goto err_g4;
+	}
+
+	/* setup the grouping for the legacy output */
+	if (drm_core_check_feature(dev, DRIVER_MODESET)) {
+		ret = drm_mode_group_init_legacy_group(dev,
+						&dev->primary->mode_group);
+		if (ret)
+			goto err_g4;
+	}
+
+	list_add_tail(&dev->driver_item, &driver->device_list);
+
+	DRM_INFO("Initialized %s %d.%d.%d %s for %s on minor %d\n",
+		 driver->name, driver->major, driver->minor, driver->patchlevel,
+		 driver->date, pci_name(pdev), dev->primary->index);
+
+	return 0;
+
+err_g4:
+	drm_put_minor(&dev->primary);
+err_g3:
+	if (drm_core_check_feature(dev, DRIVER_MODESET))
+		drm_put_minor(&dev->control);
+err_g2:
+	pci_disable_device(pdev);
+err_g1:
+	kfree(dev);
+	return ret;
+}
+EXPORT_SYMBOL(drm_get_pci_dev);
+
+/**
+ * PCI device initialization. Called via drm_init at module load time,
+ *
+ * \return zero on success or a negative number on failure.
+ *
+ * Initializes a drm_device structures,registering the
+ * stubs and initializing the AGP device.
+ *
+ * Expands the \c DRIVER_PREINIT and \c DRIVER_POST_INIT macros before and
+ * after the initialization for driver customization.
+ */
+int drm_pci_init(struct drm_driver *driver)
+{
+	struct pci_dev *pdev = NULL;
+	const struct pci_device_id *pid;
+	int i;
+
+	if (driver->driver_features & DRIVER_MODESET)
+		return pci_register_driver(&driver->pci_driver);
+
+	/* If not using KMS, fall back to stealth mode manual scanning. */
+	for (i = 0; driver->pci_driver.id_table[i].vendor != 0; i++) {
+		pid = &driver->pci_driver.id_table[i];
+
+		/* Loop around setting up a DRM device for each PCI device
+		 * matching our ID and device class.  If we had the internal
+		 * function that pci_get_subsys and pci_get_class used, we'd
+		 * be able to just pass pid in instead of doing a two-stage
+		 * thing.
+		 */
+		pdev = NULL;
+		while ((pdev =
+			pci_get_subsys(pid->vendor, pid->device, pid->subvendor,
+				       pid->subdevice, pdev)) != NULL) {
+			if ((pdev->class & pid->class_mask) != pid->class)
+				continue;
+
+			/* stealth mode requires a manual probe */
+			pci_dev_get(pdev);
+			drm_get_pci_dev(pdev, pid, driver);
+		}
+	}
+	return 0;
+}
+
+#else
+
+int drm_pci_init(struct drm_driver *driver)
+{
+	return -1;
+}
+
+#endif
 /*@}*/