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
 /*@}*/