drm/nv04-nv40: import initial pm backend

Currently just hooked up to the already-existing nouveau_hw, which should
handle all relevant chipsets as well as we currently can.

This will likely be eventually split out and improved into chipset specific
code at a later point.

Signed-off-by: Ben Skeggs <bskeggs@redhat.com>

drivers/gpu/drm/nouveau/nouveau_pm.h

@@ -41,6 +41,11 @@ int  nouveau_voltage_gpio_set(struct drm_device *, int voltage);
 void nouveau_perf_init(struct drm_device *);
 void nouveau_perf_fini(struct drm_device *);
 
+/* nv04_pm.c */
+int nv04_pm_clock_get(struct drm_device *, u32 id);
+void *nv04_pm_clock_pre(struct drm_device *, u32 id, int khz);
+void nv04_pm_clock_set(struct drm_device *, void *);
+
 /* nv50_pm.c */
 int nv50_pm_clock_get(struct drm_device *, u32 id);
 void *nv50_pm_clock_pre(struct drm_device *, u32 id, int khz);