static struct nouveau_oclass
 nv50_fifo_sclass[] = {
-       { 0x506e, &nv50_fifo_ofuncs_dma },
-       { 0x506f, &nv50_fifo_ofuncs_ind },
+       { NV50_CHANNEL_DMA_CLASS, &nv50_fifo_ofuncs_dma },
+       { NV50_CHANNEL_IND_CLASS, &nv50_fifo_ofuncs_ind },
        {}
 };
 
 
 
 static struct nouveau_oclass
 nv84_fifo_sclass[] = {
-       { 0x826e, &nv84_fifo_ofuncs_dma },
-       { 0x826f, &nv84_fifo_ofuncs_ind },
+       { NV84_CHANNEL_DMA_CLASS, &nv84_fifo_ofuncs_dma },
+       { NV84_CHANNEL_IND_CLASS, &nv84_fifo_ofuncs_ind },
        {}
 };
 
 
                    u32 parent, u32 handle, u32 engine,
                    struct nouveau_channel **pchan)
 {
-       static const u16 oclasses[] = { 0xa06f, 0x906f, 0x826f, 0x506f, 0 };
+       static const u16 oclasses[] = { NVE0_CHANNEL_IND_CLASS,
+                                       NVC0_CHANNEL_IND_CLASS,
+                                       NV84_CHANNEL_IND_CLASS,
+                                       NV50_CHANNEL_IND_CLASS,
+                                       0 };
        const u16 *oclass = oclasses;
        struct nve0_channel_ind_class args;
        struct nouveau_channel *chan;
 nouveau_channel_dma(struct nouveau_drm *drm, struct nouveau_cli *cli,
                    u32 parent, u32 handle, struct nouveau_channel **pchan)
 {
-       static const u16 oclasses[] = { 0x406e, 0x176e, 0x006e, 0x006b, 0 };
+       static const u16 oclasses[] = { NV40_CHANNEL_DMA_CLASS,
+                                       NV17_CHANNEL_DMA_CLASS,
+                                       NV10_CHANNEL_DMA_CLASS,
+                                       NV03_CHANNEL_DMA_CLASS,
+                                       0 };
        const u16 *oclass = oclasses;
        struct nv03_channel_dma_class args;
        struct nouveau_channel *chan;