support for platform devices

Upcoming mobile Kepler GPUs (such as GK20A) use the platform bus instead
of PCI to which Nouveau is tightly dependent. This patch allows Nouveau
to handle platform devices by:

- abstracting PCI-dependent functions that were typically used for
  resource querying and page mapping,
- introducing a nv_device_is_pci() function that allows to make
  PCI-dependent code conditional,
- providing a nouveau_drm_platform_probe() function that takes a GPU
  platform device to be probed.

Core code as well as engine/subdev drivers are updated wherever possible
to make use of these functions. Some older drivers are too dependent on
PCI to be properly updated, but all newer code on which future chips may
depend should at least be runnable with platform devices.

Signed-off-by: Alexandre Courbot <acourbot@nvidia.com>
Signed-off-by: Ben Skeggs <bskeggs@redhat.com>

1 files changed, 5 insertions, 3 deletions

diff --git a/drivers/gpu/drm/nouveau/nouveau_sysfs.c b/drivers/gpu/drm/nouveau/nouveau_sysfs.c
index 89201a17ce75..75dda2b07176 100644
--- a/drivers/gpu/drm/nouveau/nouveau_sysfs.c
+++ b/drivers/gpu/drm/nouveau/nouveau_sysfs.c
@@ -30,7 +30,7 @@
 static inline struct drm_device *
 drm_device(struct device *d)
 {
-	return pci_get_drvdata(to_pci_dev(d));
+	return dev_get_drvdata(d);
 }
 
 #define snappendf(p,r,f,a...) do {                                             \
@@ -132,9 +132,10 @@ nouveau_sysfs_fini(struct drm_device *dev)
 {
 	struct nouveau_sysfs *sysfs = nouveau_sysfs(dev);
 	struct nouveau_drm *drm = nouveau_drm(dev);
+	struct nouveau_device *device = nv_device(drm->device);
 
 	if (sysfs->ctrl) {
-		device_remove_file(&dev->pdev->dev, &dev_attr_pstate);
+		device_remove_file(nv_device_base(device), &dev_attr_pstate);
 		nouveau_object_del(nv_object(drm), NVDRM_DEVICE, NVDRM_CONTROL);
 	}
 
@@ -146,6 +147,7 @@ int
 nouveau_sysfs_init(struct drm_device *dev)
 {
 	struct nouveau_drm *drm = nouveau_drm(dev);
+	struct nouveau_device *device = nv_device(drm->device);
 	struct nouveau_sysfs *sysfs;
 	int ret;
 
@@ -156,7 +158,7 @@ nouveau_sysfs_init(struct drm_device *dev)
 	ret = nouveau_object_new(nv_object(drm), NVDRM_DEVICE, NVDRM_CONTROL,
 				 NV_CONTROL_CLASS, NULL, 0, &sysfs->ctrl);
 	if (ret == 0)
-		device_create_file(&dev->pdev->dev, &dev_attr_pstate);
+		device_create_file(nv_device_base(device), &dev_attr_pstate);
 
 	return 0;
 }