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>
2010-05-27 13:40:25 -06:00
parent 01d73a6967
commit dcdb167402
17 changed files with 401 additions and 171 deletions
--- a/drivers/gpu/drm/drm_platform.c
+++ b/drivers/gpu/drm/drm_platform.c
@@ -0,0 +1,122 @@
+/*
+ * Derived from drm_pci.c
+ *
+ * Copyright 2003 José Fonseca.
+ * Copyright 2003 Leif Delgass.
+ * Copyright (c) 2009, Code Aurora Forum.
+ * All Rights Reserved.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the next
+ * paragraph) shall be included in all copies or substantial portions of the
+ * Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL THE
+ * AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
+ * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+ * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+
+#include "drmP.h"
+
+/**
+ * Register.
+ *
+ * \param platdev - Platform device struture
+ * \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_platform_dev(struct platform_device *platdev,
+			 struct drm_driver *driver)
+{
+	struct drm_device *dev;
+	int ret;
+
+	DRM_DEBUG("\n");
+
+	dev = kzalloc(sizeof(*dev), GFP_KERNEL);
+	if (!dev)
+		return -ENOMEM;
+
+	dev->platformdev = platdev;
+	dev->dev = &platdev->dev;
+
+	ret = drm_fill_in_dev(dev, NULL, driver);
+
+	if (ret) {
+		printk(KERN_ERR "DRM: Fill_in_dev failed.\n");
+		goto err_g1;
+	}
+
+	if (drm_core_check_feature(dev, DRIVER_MODESET)) {
+		dev_set_drvdata(&platdev->dev, dev);
+		ret = drm_get_minor(dev, &dev->control, DRM_MINOR_CONTROL);
+		if (ret)
+			goto err_g1;
+	}
+
+	ret = drm_get_minor(dev, &dev->primary, DRM_MINOR_LEGACY);
+	if (ret)
+		goto err_g2;
+
+	if (dev->driver->load) {
+		ret = dev->driver->load(dev, 0);
+		if (ret)
+			goto err_g3;
+	}
+
+	/* 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_g3;
+	}
+
+	list_add_tail(&dev->driver_item, &driver->device_list);
+
+	DRM_INFO("Initialized %s %d.%d.%d %s on minor %d\n",
+		 driver->name, driver->major, driver->minor, driver->patchlevel,
+		 driver->date, dev->primary->index);
+
+	return 0;
+
+err_g3:
+	drm_put_minor(&dev->primary);
+err_g2:
+	if (drm_core_check_feature(dev, DRIVER_MODESET))
+		drm_put_minor(&dev->control);
+err_g1:
+	kfree(dev);
+	return ret;
+}
+EXPORT_SYMBOL(drm_get_platform_dev);
+
+/**
+ * Platform 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
+ *
+ * Expands the \c DRIVER_PREINIT and \c DRIVER_POST_INIT macros before and
+ * after the initialization for driver customization.
+ */
+
+int drm_platform_init(struct drm_driver *driver)
+{
+	return drm_get_platform_dev(driver->platform_device, driver);
+}