#define __NVKM_IBUS_H__
 #include <core/subdev.h>
 
-struct nvkm_ibus {
-       struct nvkm_subdev subdev;
-};
-
-static inline struct nvkm_ibus *
-nvkm_ibus(void *obj)
-{
-       return (void *)nvkm_subdev(obj, NVDEV_SUBDEV_IBUS);
-}
-
-#define nvkm_ibus_create(p,e,o,d)                                           \
-       nvkm_subdev_create_((p), (e), (o), 0, "PIBUS", "ibus",              \
-                              sizeof(**d), (void **)d)
-#define nvkm_ibus_destroy(p)                                                \
-       nvkm_subdev_destroy(&(p)->subdev)
-#define nvkm_ibus_init(p)                                                   \
-       nvkm_subdev_init_old(&(p)->subdev)
-#define nvkm_ibus_fini(p,s)                                                 \
-       nvkm_subdev_fini_old(&(p)->subdev, (s))
-
-#define _nvkm_ibus_dtor _nvkm_subdev_dtor
-#define _nvkm_ibus_init _nvkm_subdev_init
-#define _nvkm_ibus_fini _nvkm_subdev_fini
-
-extern struct nvkm_oclass gf100_ibus_oclass;
-extern struct nvkm_oclass gk104_ibus_oclass;
-extern struct nvkm_oclass gk20a_ibus_oclass;
+int gf100_ibus_new(struct nvkm_device *, int, struct nvkm_subdev **);
+int gk104_ibus_new(struct nvkm_device *, int, struct nvkm_subdev **);
+int gk20a_ibus_new(struct nvkm_device *, int, struct nvkm_subdev **);
 #endif
 
        .fuse = gf100_fuse_new,
        .gpio = g94_gpio_new,
        .i2c = g94_i2c_new,
-//     .ibus = gf100_ibus_new,
+       .ibus = gf100_ibus_new,
 //     .imem = nv50_instmem_new,
 //     .ltc = gf100_ltc_new,
 //     .mc = gf100_mc_new,
        .fuse = gf100_fuse_new,
        .gpio = g94_gpio_new,
        .i2c = g94_i2c_new,
-//     .ibus = gf100_ibus_new,
+       .ibus = gf100_ibus_new,
 //     .imem = nv50_instmem_new,
 //     .ltc = gf100_ltc_new,
 //     .mc = gf106_mc_new,
        .fuse = gf100_fuse_new,
        .gpio = g94_gpio_new,
        .i2c = g94_i2c_new,
-//     .ibus = gf100_ibus_new,
+       .ibus = gf100_ibus_new,
 //     .imem = nv50_instmem_new,
 //     .ltc = gf100_ltc_new,
 //     .mc = gf106_mc_new,
        .fuse = gf100_fuse_new,
        .gpio = g94_gpio_new,
        .i2c = g94_i2c_new,
-//     .ibus = gf100_ibus_new,
+       .ibus = gf100_ibus_new,
 //     .imem = nv50_instmem_new,
 //     .ltc = gf100_ltc_new,
 //     .mc = gf100_mc_new,
        .fuse = gf100_fuse_new,
        .gpio = g94_gpio_new,
        .i2c = g94_i2c_new,
-//     .ibus = gf100_ibus_new,
+       .ibus = gf100_ibus_new,
 //     .imem = nv50_instmem_new,
 //     .ltc = gf100_ltc_new,
 //     .mc = gf100_mc_new,
        .fuse = gf100_fuse_new,
        .gpio = g94_gpio_new,
        .i2c = g94_i2c_new,
-//     .ibus = gf100_ibus_new,
+       .ibus = gf100_ibus_new,
 //     .imem = nv50_instmem_new,
 //     .ltc = gf100_ltc_new,
 //     .mc = gf100_mc_new,
        .fuse = gf100_fuse_new,
        .gpio = g94_gpio_new,
        .i2c = g94_i2c_new,
-//     .ibus = gf100_ibus_new,
+       .ibus = gf100_ibus_new,
 //     .imem = nv50_instmem_new,
 //     .ltc = gf100_ltc_new,
 //     .mc = gf106_mc_new,
        .fuse = gf100_fuse_new,
        .gpio = gf119_gpio_new,
        .i2c = gf117_i2c_new,
-//     .ibus = gf100_ibus_new,
+       .ibus = gf100_ibus_new,
 //     .imem = nv50_instmem_new,
 //     .ltc = gf100_ltc_new,
 //     .mc = gf106_mc_new,
        .fuse = gf100_fuse_new,
        .gpio = gf119_gpio_new,
        .i2c = gf119_i2c_new,
-//     .ibus = gf100_ibus_new,
+       .ibus = gf100_ibus_new,
 //     .imem = nv50_instmem_new,
 //     .ltc = gf100_ltc_new,
 //     .mc = gf106_mc_new,
        .fuse = gf100_fuse_new,
        .gpio = gk104_gpio_new,
        .i2c = gk104_i2c_new,
-//     .ibus = gk104_ibus_new,
+       .ibus = gk104_ibus_new,
 //     .imem = nv50_instmem_new,
 //     .ltc = gk104_ltc_new,
 //     .mc = gf106_mc_new,
        .fuse = gf100_fuse_new,
        .gpio = gk104_gpio_new,
        .i2c = gk104_i2c_new,
-//     .ibus = gk104_ibus_new,
+       .ibus = gk104_ibus_new,
 //     .imem = nv50_instmem_new,
 //     .ltc = gk104_ltc_new,
 //     .mc = gf106_mc_new,
        .fuse = gf100_fuse_new,
        .gpio = gk104_gpio_new,
        .i2c = gk104_i2c_new,
-//     .ibus = gk104_ibus_new,
+       .ibus = gk104_ibus_new,
 //     .imem = nv50_instmem_new,
 //     .ltc = gk104_ltc_new,
 //     .mc = gf106_mc_new,
        .clk = gk20a_clk_new,
        .fb = gk20a_fb_new,
        .fuse = gf100_fuse_new,
-//     .ibus = gk20a_ibus_new,
+       .ibus = gk20a_ibus_new,
 //     .imem = gk20a_instmem_new,
 //     .ltc = gk104_ltc_new,
 //     .mc = gk20a_mc_new,
        .fuse = gf100_fuse_new,
        .gpio = gk104_gpio_new,
        .i2c = gk104_i2c_new,
-//     .ibus = gk104_ibus_new,
+       .ibus = gk104_ibus_new,
 //     .imem = nv50_instmem_new,
 //     .ltc = gk104_ltc_new,
 //     .mc = gf106_mc_new,
        .fuse = gf100_fuse_new,
        .gpio = gk104_gpio_new,
        .i2c = gf119_i2c_new,
-//     .ibus = gk104_ibus_new,
+       .ibus = gk104_ibus_new,
 //     .imem = nv50_instmem_new,
 //     .ltc = gk104_ltc_new,
 //     .mc = gf106_mc_new,
        .fuse = gf100_fuse_new,
        .gpio = gk104_gpio_new,
        .i2c = gk104_i2c_new,
-//     .ibus = gk104_ibus_new,
+       .ibus = gk104_ibus_new,
 //     .imem = nv50_instmem_new,
 //     .ltc = gk104_ltc_new,
 //     .mc = gk20a_mc_new,
        .fuse = gf100_fuse_new,
        .gpio = gk104_gpio_new,
        .i2c = gk104_i2c_new,
-//     .ibus = gk104_ibus_new,
+       .ibus = gk104_ibus_new,
 //     .imem = nv50_instmem_new,
 //     .ltc = gk104_ltc_new,
 //     .mc = gk20a_mc_new,
        .fuse = gm107_fuse_new,
        .gpio = gk104_gpio_new,
        .i2c = gf119_i2c_new,
-//     .ibus = gk104_ibus_new,
+       .ibus = gk104_ibus_new,
 //     .imem = nv50_instmem_new,
 //     .ltc = gm107_ltc_new,
 //     .mc = gk20a_mc_new,
        .fuse = gm107_fuse_new,
        .gpio = gk104_gpio_new,
        .i2c = gm204_i2c_new,
-//     .ibus = gk104_ibus_new,
+       .ibus = gk104_ibus_new,
 //     .imem = nv50_instmem_new,
 //     .ltc = gm107_ltc_new,
 //     .mc = gk20a_mc_new,
        .fuse = gm107_fuse_new,
        .gpio = gk104_gpio_new,
        .i2c = gm204_i2c_new,
-//     .ibus = gk104_ibus_new,
+       .ibus = gk104_ibus_new,
 //     .imem = nv50_instmem_new,
 //     .ltc = gm107_ltc_new,
 //     .mc = gk20a_mc_new,
        .bus = gf100_bus_new,
        .fb = gk20a_fb_new,
        .fuse = gm107_fuse_new,
-//     .ibus = gk20a_ibus_new,
+       .ibus = gk20a_ibus_new,
 //     .imem = gk20a_instmem_new,
 //     .ltc = gm107_ltc_new,
 //     .mc = gk20a_mc_new,
 
                device->oclass[NVDEV_SUBDEV_MC     ] =  gf100_mc_oclass;
                device->oclass[NVDEV_SUBDEV_TIMER  ] = &nv04_timer_oclass;
                device->oclass[NVDEV_SUBDEV_LTC    ] =  gf100_ltc_oclass;
-               device->oclass[NVDEV_SUBDEV_IBUS   ] = &gf100_ibus_oclass;
                device->oclass[NVDEV_SUBDEV_INSTMEM] =  nv50_instmem_oclass;
                device->oclass[NVDEV_SUBDEV_MMU    ] = &gf100_mmu_oclass;
                device->oclass[NVDEV_SUBDEV_PMU    ] =  gf100_pmu_oclass;
                device->oclass[NVDEV_SUBDEV_MC     ] =  gf100_mc_oclass;
                device->oclass[NVDEV_SUBDEV_TIMER  ] = &nv04_timer_oclass;
                device->oclass[NVDEV_SUBDEV_LTC    ] =  gf100_ltc_oclass;
-               device->oclass[NVDEV_SUBDEV_IBUS   ] = &gf100_ibus_oclass;
                device->oclass[NVDEV_SUBDEV_INSTMEM] =  nv50_instmem_oclass;
                device->oclass[NVDEV_SUBDEV_MMU    ] = &gf100_mmu_oclass;
                device->oclass[NVDEV_SUBDEV_PMU    ] =  gf100_pmu_oclass;
                device->oclass[NVDEV_SUBDEV_MC     ] =  gf106_mc_oclass;
                device->oclass[NVDEV_SUBDEV_TIMER  ] = &nv04_timer_oclass;
                device->oclass[NVDEV_SUBDEV_LTC    ] =  gf100_ltc_oclass;
-               device->oclass[NVDEV_SUBDEV_IBUS   ] = &gf100_ibus_oclass;
                device->oclass[NVDEV_SUBDEV_INSTMEM] =  nv50_instmem_oclass;
                device->oclass[NVDEV_SUBDEV_MMU    ] = &gf100_mmu_oclass;
                device->oclass[NVDEV_SUBDEV_PMU    ] =  gf100_pmu_oclass;
                device->oclass[NVDEV_SUBDEV_MC     ] =  gf100_mc_oclass;
                device->oclass[NVDEV_SUBDEV_TIMER  ] = &nv04_timer_oclass;
                device->oclass[NVDEV_SUBDEV_LTC    ] =  gf100_ltc_oclass;
-               device->oclass[NVDEV_SUBDEV_IBUS   ] = &gf100_ibus_oclass;
                device->oclass[NVDEV_SUBDEV_INSTMEM] =  nv50_instmem_oclass;
                device->oclass[NVDEV_SUBDEV_MMU    ] = &gf100_mmu_oclass;
                device->oclass[NVDEV_SUBDEV_PMU    ] =  gf100_pmu_oclass;
                device->oclass[NVDEV_SUBDEV_MC     ] =  gf106_mc_oclass;
                device->oclass[NVDEV_SUBDEV_TIMER  ] = &nv04_timer_oclass;
                device->oclass[NVDEV_SUBDEV_LTC    ] =  gf100_ltc_oclass;
-               device->oclass[NVDEV_SUBDEV_IBUS   ] = &gf100_ibus_oclass;
                device->oclass[NVDEV_SUBDEV_INSTMEM] =  nv50_instmem_oclass;
                device->oclass[NVDEV_SUBDEV_MMU    ] = &gf100_mmu_oclass;
                device->oclass[NVDEV_SUBDEV_PMU    ] =  gf100_pmu_oclass;
                device->oclass[NVDEV_SUBDEV_MC     ] =  gf106_mc_oclass;
                device->oclass[NVDEV_SUBDEV_TIMER  ] = &nv04_timer_oclass;
                device->oclass[NVDEV_SUBDEV_LTC    ] =  gf100_ltc_oclass;
-               device->oclass[NVDEV_SUBDEV_IBUS   ] = &gf100_ibus_oclass;
                device->oclass[NVDEV_SUBDEV_INSTMEM] =  nv50_instmem_oclass;
                device->oclass[NVDEV_SUBDEV_MMU    ] = &gf100_mmu_oclass;
                device->oclass[NVDEV_SUBDEV_PMU    ] =  gf100_pmu_oclass;
                device->oclass[NVDEV_SUBDEV_MC     ] =  gf100_mc_oclass;
                device->oclass[NVDEV_SUBDEV_TIMER  ] = &nv04_timer_oclass;
                device->oclass[NVDEV_SUBDEV_LTC    ] =  gf100_ltc_oclass;
-               device->oclass[NVDEV_SUBDEV_IBUS   ] = &gf100_ibus_oclass;
                device->oclass[NVDEV_SUBDEV_INSTMEM] =  nv50_instmem_oclass;
                device->oclass[NVDEV_SUBDEV_MMU    ] = &gf100_mmu_oclass;
                device->oclass[NVDEV_SUBDEV_PMU    ] =  gf100_pmu_oclass;
                device->oclass[NVDEV_SUBDEV_MC     ] =  gf106_mc_oclass;
                device->oclass[NVDEV_SUBDEV_TIMER  ] = &nv04_timer_oclass;
                device->oclass[NVDEV_SUBDEV_LTC    ] =  gf100_ltc_oclass;
-               device->oclass[NVDEV_SUBDEV_IBUS   ] = &gf100_ibus_oclass;
                device->oclass[NVDEV_SUBDEV_INSTMEM] =  nv50_instmem_oclass;
                device->oclass[NVDEV_SUBDEV_MMU    ] = &gf100_mmu_oclass;
                device->oclass[NVDEV_SUBDEV_PMU    ] =  gf110_pmu_oclass;
                device->oclass[NVDEV_SUBDEV_MC     ] =  gf106_mc_oclass;
                device->oclass[NVDEV_SUBDEV_TIMER  ] = &nv04_timer_oclass;
                device->oclass[NVDEV_SUBDEV_LTC    ] =  gf100_ltc_oclass;
-               device->oclass[NVDEV_SUBDEV_IBUS   ] = &gf100_ibus_oclass;
                device->oclass[NVDEV_SUBDEV_INSTMEM] =  nv50_instmem_oclass;
                device->oclass[NVDEV_SUBDEV_MMU    ] = &gf100_mmu_oclass;
                device->oclass[NVDEV_ENGINE_DMAOBJ ] =  gf110_dmaeng_oclass;
 
                device->oclass[NVDEV_SUBDEV_MC     ] =  gf106_mc_oclass;
                device->oclass[NVDEV_SUBDEV_TIMER  ] = &nv04_timer_oclass;
                device->oclass[NVDEV_SUBDEV_LTC    ] =  gk104_ltc_oclass;
-               device->oclass[NVDEV_SUBDEV_IBUS   ] = &gk104_ibus_oclass;
                device->oclass[NVDEV_SUBDEV_INSTMEM] =  nv50_instmem_oclass;
                device->oclass[NVDEV_SUBDEV_MMU    ] = &gf100_mmu_oclass;
                device->oclass[NVDEV_SUBDEV_PMU    ] =  gk104_pmu_oclass;
                device->oclass[NVDEV_SUBDEV_MC     ] =  gf106_mc_oclass;
                device->oclass[NVDEV_SUBDEV_TIMER  ] = &nv04_timer_oclass;
                device->oclass[NVDEV_SUBDEV_LTC    ] =  gk104_ltc_oclass;
-               device->oclass[NVDEV_SUBDEV_IBUS   ] = &gk104_ibus_oclass;
                device->oclass[NVDEV_SUBDEV_INSTMEM] =  nv50_instmem_oclass;
                device->oclass[NVDEV_SUBDEV_MMU    ] = &gf100_mmu_oclass;
                device->oclass[NVDEV_SUBDEV_PMU    ] =  gf110_pmu_oclass;
                device->oclass[NVDEV_SUBDEV_MC     ] =  gf106_mc_oclass;
                device->oclass[NVDEV_SUBDEV_TIMER  ] = &nv04_timer_oclass;
                device->oclass[NVDEV_SUBDEV_LTC    ] =  gk104_ltc_oclass;
-               device->oclass[NVDEV_SUBDEV_IBUS   ] = &gk104_ibus_oclass;
                device->oclass[NVDEV_SUBDEV_INSTMEM] =  nv50_instmem_oclass;
                device->oclass[NVDEV_SUBDEV_MMU    ] = &gf100_mmu_oclass;
                device->oclass[NVDEV_SUBDEV_PMU    ] =  gk104_pmu_oclass;
                device->oclass[NVDEV_SUBDEV_MC     ] =  gk20a_mc_oclass;
                device->oclass[NVDEV_SUBDEV_TIMER  ] = &gk20a_timer_oclass;
                device->oclass[NVDEV_SUBDEV_LTC    ] =  gk104_ltc_oclass;
-               device->oclass[NVDEV_SUBDEV_IBUS   ] = &gk20a_ibus_oclass;
                device->oclass[NVDEV_SUBDEV_INSTMEM] = gk20a_instmem_oclass;
                device->oclass[NVDEV_SUBDEV_MMU    ] = &gf100_mmu_oclass;
                device->oclass[NVDEV_ENGINE_DMAOBJ ] =  gf110_dmaeng_oclass;
                device->oclass[NVDEV_SUBDEV_MC     ] =  gf106_mc_oclass;
                device->oclass[NVDEV_SUBDEV_TIMER  ] = &nv04_timer_oclass;
                device->oclass[NVDEV_SUBDEV_LTC    ] =  gk104_ltc_oclass;
-               device->oclass[NVDEV_SUBDEV_IBUS   ] = &gk104_ibus_oclass;
                device->oclass[NVDEV_SUBDEV_INSTMEM] =  nv50_instmem_oclass;
                device->oclass[NVDEV_SUBDEV_MMU    ] = &gf100_mmu_oclass;
                device->oclass[NVDEV_SUBDEV_PMU    ] =  gk110_pmu_oclass;
                device->oclass[NVDEV_SUBDEV_MC     ] =  gf106_mc_oclass;
                device->oclass[NVDEV_SUBDEV_TIMER  ] = &nv04_timer_oclass;
                device->oclass[NVDEV_SUBDEV_LTC    ] =  gk104_ltc_oclass;
-               device->oclass[NVDEV_SUBDEV_IBUS   ] = &gk104_ibus_oclass;
                device->oclass[NVDEV_SUBDEV_INSTMEM] =  nv50_instmem_oclass;
                device->oclass[NVDEV_SUBDEV_MMU    ] = &gf100_mmu_oclass;
                device->oclass[NVDEV_SUBDEV_PMU    ] =  gk110_pmu_oclass;
                device->oclass[NVDEV_SUBDEV_MC     ] =  gk20a_mc_oclass;
                device->oclass[NVDEV_SUBDEV_TIMER  ] = &nv04_timer_oclass;
                device->oclass[NVDEV_SUBDEV_LTC    ] =  gk104_ltc_oclass;
-               device->oclass[NVDEV_SUBDEV_IBUS   ] = &gk104_ibus_oclass;
                device->oclass[NVDEV_SUBDEV_INSTMEM] =  nv50_instmem_oclass;
                device->oclass[NVDEV_SUBDEV_MMU    ] = &gf100_mmu_oclass;
                device->oclass[NVDEV_SUBDEV_PMU    ] =  gk208_pmu_oclass;
                device->oclass[NVDEV_SUBDEV_MC     ] =  gk20a_mc_oclass;
                device->oclass[NVDEV_SUBDEV_TIMER  ] = &nv04_timer_oclass;
                device->oclass[NVDEV_SUBDEV_LTC    ] =  gk104_ltc_oclass;
-               device->oclass[NVDEV_SUBDEV_IBUS   ] = &gk104_ibus_oclass;
                device->oclass[NVDEV_SUBDEV_INSTMEM] =  nv50_instmem_oclass;
                device->oclass[NVDEV_SUBDEV_MMU    ] = &gf100_mmu_oclass;
                device->oclass[NVDEV_SUBDEV_PMU    ] =  gk208_pmu_oclass;
 
                device->oclass[NVDEV_SUBDEV_MC     ] =  gk20a_mc_oclass;
                device->oclass[NVDEV_SUBDEV_TIMER  ] = &gk20a_timer_oclass;
                device->oclass[NVDEV_SUBDEV_LTC    ] =  gm107_ltc_oclass;
-               device->oclass[NVDEV_SUBDEV_IBUS   ] = &gk104_ibus_oclass;
                device->oclass[NVDEV_SUBDEV_INSTMEM] =  nv50_instmem_oclass;
                device->oclass[NVDEV_SUBDEV_MMU    ] = &gf100_mmu_oclass;
                device->oclass[NVDEV_SUBDEV_PMU    ] =  gk208_pmu_oclass;
                device->oclass[NVDEV_SUBDEV_MC     ] =  gk20a_mc_oclass;
                device->oclass[NVDEV_SUBDEV_TIMER  ] = &gk20a_timer_oclass;
                device->oclass[NVDEV_SUBDEV_LTC    ] =  gm107_ltc_oclass;
-               device->oclass[NVDEV_SUBDEV_IBUS   ] = &gk104_ibus_oclass;
                device->oclass[NVDEV_SUBDEV_INSTMEM] =  nv50_instmem_oclass;
                device->oclass[NVDEV_SUBDEV_MMU    ] = &gf100_mmu_oclass;
                device->oclass[NVDEV_SUBDEV_PMU    ] =  gk208_pmu_oclass;
                device->oclass[NVDEV_SUBDEV_MC     ] =  gk20a_mc_oclass;
                device->oclass[NVDEV_SUBDEV_TIMER  ] = &gk20a_timer_oclass;
                device->oclass[NVDEV_SUBDEV_LTC    ] =  gm107_ltc_oclass;
-               device->oclass[NVDEV_SUBDEV_IBUS   ] = &gk104_ibus_oclass;
                device->oclass[NVDEV_SUBDEV_INSTMEM] =  nv50_instmem_oclass;
                device->oclass[NVDEV_SUBDEV_MMU    ] = &gf100_mmu_oclass;
                device->oclass[NVDEV_SUBDEV_PMU    ] =  gk208_pmu_oclass;
                device->oclass[NVDEV_SUBDEV_MMU    ] = &gf100_mmu_oclass;
                device->oclass[NVDEV_SUBDEV_TIMER  ] = &gk20a_timer_oclass;
                device->oclass[NVDEV_SUBDEV_LTC    ] =  gm107_ltc_oclass;
-               device->oclass[NVDEV_SUBDEV_IBUS   ] = &gk20a_ibus_oclass;
                device->oclass[NVDEV_SUBDEV_INSTMEM] = gk20a_instmem_oclass;
                device->oclass[NVDEV_SUBDEV_MMU    ] = &gf100_mmu_oclass;
                device->oclass[NVDEV_ENGINE_DMAOBJ ] =  gf110_dmaeng_oclass;
 
 #include <subdev/bios/init.h>
 #include <subdev/bios/pll.h>
 #include <subdev/clk/pll.h>
-#include <subdev/ibus.h>
 #include <subdev/vga.h>
 
 int
        struct nv50_devinit *init = nv50_devinit(base);
        struct nvkm_subdev *subdev = &init->base.subdev;
        struct nvkm_device *device = subdev->device;
-       struct nvkm_subdev *ibus = device->ibus;
 
        /* our heuristics can't detect whether the board has had its
         * devinit scripts executed or not if the display engine is
                        init->base.post = true;
                }
        }
-
-       /* some boards appear to require certain init register timeouts
-        * to be bumped before runing devinit scripts.  not a clue why
-        * the vbios engineers didn't make the scripts just work...
-        */
-       if (init->base.post && ibus)
-               nvkm_object_init(&ibus->object);
 }
 
 void
 
 #include <subdev/ibus.h>
 
 static void
-gf100_ibus_intr_hub(struct nvkm_ibus *ibus, int i)
+gf100_ibus_intr_hub(struct nvkm_subdev *ibus, int i)
 {
-       struct nvkm_subdev *subdev = &ibus->subdev;
-       struct nvkm_device *device = subdev->device;
+       struct nvkm_device *device = ibus->device;
        u32 addr = nvkm_rd32(device, 0x122120 + (i * 0x0400));
        u32 data = nvkm_rd32(device, 0x122124 + (i * 0x0400));
        u32 stat = nvkm_rd32(device, 0x122128 + (i * 0x0400));
-       nvkm_error(subdev, "HUB%d: %06x %08x (%08x)\n", i, addr, data, stat);
+       nvkm_error(ibus, "HUB%d: %06x %08x (%08x)\n", i, addr, data, stat);
        nvkm_mask(device, 0x122128 + (i * 0x0400), 0x00000200, 0x00000000);
 }
 
 static void
-gf100_ibus_intr_rop(struct nvkm_ibus *ibus, int i)
+gf100_ibus_intr_rop(struct nvkm_subdev *ibus, int i)
 {
-       struct nvkm_subdev *subdev = &ibus->subdev;
-       struct nvkm_device *device = subdev->device;
+       struct nvkm_device *device = ibus->device;
        u32 addr = nvkm_rd32(device, 0x124120 + (i * 0x0400));
        u32 data = nvkm_rd32(device, 0x124124 + (i * 0x0400));
        u32 stat = nvkm_rd32(device, 0x124128 + (i * 0x0400));
-       nvkm_error(subdev, "ROP%d: %06x %08x (%08x)\n", i, addr, data, stat);
+       nvkm_error(ibus, "ROP%d: %06x %08x (%08x)\n", i, addr, data, stat);
        nvkm_mask(device, 0x124128 + (i * 0x0400), 0x00000200, 0x00000000);
 }
 
 static void
-gf100_ibus_intr_gpc(struct nvkm_ibus *ibus, int i)
+gf100_ibus_intr_gpc(struct nvkm_subdev *ibus, int i)
 {
-       struct nvkm_subdev *subdev = &ibus->subdev;
-       struct nvkm_device *device = subdev->device;
+       struct nvkm_device *device = ibus->device;
        u32 addr = nvkm_rd32(device, 0x128120 + (i * 0x0400));
        u32 data = nvkm_rd32(device, 0x128124 + (i * 0x0400));
        u32 stat = nvkm_rd32(device, 0x128128 + (i * 0x0400));
-       nvkm_error(subdev, "GPC%d: %06x %08x (%08x)\n", i, addr, data, stat);
+       nvkm_error(ibus, "GPC%d: %06x %08x (%08x)\n", i, addr, data, stat);
        nvkm_mask(device, 0x128128 + (i * 0x0400), 0x00000200, 0x00000000);
 }
 
 static void
-gf100_ibus_intr(struct nvkm_subdev *subdev)
+gf100_ibus_intr(struct nvkm_subdev *ibus)
 {
-       struct nvkm_ibus *ibus = (void *)subdev;
-       struct nvkm_device *device = ibus->subdev.device;
+       struct nvkm_device *device = ibus->device;
        u32 intr0 = nvkm_rd32(device, 0x121c58);
        u32 intr1 = nvkm_rd32(device, 0x121c5c);
        u32 hubnr = nvkm_rd32(device, 0x121c70);
        }
 }
 
-static int
-gf100_ibus_ctor(struct nvkm_object *parent, struct nvkm_object *engine,
-               struct nvkm_oclass *oclass, void *data, u32 size,
-               struct nvkm_object **pobject)
-{
-       struct nvkm_ibus *ibus;
-       int ret;
-
-       ret = nvkm_ibus_create(parent, engine, oclass, &ibus);
-       *pobject = nv_object(ibus);
-       if (ret)
-               return ret;
+static const struct nvkm_subdev_func
+gf100_ibus = {
+       .intr = gf100_ibus_intr,
+};
 
-       nv_subdev(ibus)->intr = gf100_ibus_intr;
+int
+gf100_ibus_new(struct nvkm_device *device, int index,
+              struct nvkm_subdev **pibus)
+{
+       struct nvkm_subdev *ibus;
+       if (!(ibus = *pibus = kzalloc(sizeof(*ibus), GFP_KERNEL)))
+               return -ENOMEM;
+       nvkm_subdev_ctor(&gf100_ibus, device, index, 0, ibus);
        return 0;
 }
-
-struct nvkm_oclass
-gf100_ibus_oclass = {
-       .handle = NV_SUBDEV(IBUS, 0xc0),
-       .ofuncs = &(struct nvkm_ofuncs) {
-               .ctor = gf100_ibus_ctor,
-               .dtor = _nvkm_ibus_dtor,
-               .init = _nvkm_ibus_init,
-               .fini = _nvkm_ibus_fini,
-       },
-};
 
 #include <subdev/ibus.h>
 
 static void
-gk104_ibus_intr_hub(struct nvkm_ibus *ibus, int i)
+gk104_ibus_intr_hub(struct nvkm_subdev *ibus, int i)
 {
-       struct nvkm_subdev *subdev = &ibus->subdev;
-       struct nvkm_device *device = subdev->device;
+       struct nvkm_device *device = ibus->device;
        u32 addr = nvkm_rd32(device, 0x122120 + (i * 0x0800));
        u32 data = nvkm_rd32(device, 0x122124 + (i * 0x0800));
        u32 stat = nvkm_rd32(device, 0x122128 + (i * 0x0800));
-       nvkm_error(subdev, "HUB%d: %06x %08x (%08x)\n", i, addr, data, stat);
+       nvkm_error(ibus, "HUB%d: %06x %08x (%08x)\n", i, addr, data, stat);
        nvkm_mask(device, 0x122128 + (i * 0x0800), 0x00000200, 0x00000000);
 }
 
 static void
-gk104_ibus_intr_rop(struct nvkm_ibus *ibus, int i)
+gk104_ibus_intr_rop(struct nvkm_subdev *ibus, int i)
 {
-       struct nvkm_subdev *subdev = &ibus->subdev;
-       struct nvkm_device *device = subdev->device;
+       struct nvkm_device *device = ibus->device;
        u32 addr = nvkm_rd32(device, 0x124120 + (i * 0x0800));
        u32 data = nvkm_rd32(device, 0x124124 + (i * 0x0800));
        u32 stat = nvkm_rd32(device, 0x124128 + (i * 0x0800));
-       nvkm_error(subdev, "ROP%d: %06x %08x (%08x)\n", i, addr, data, stat);
+       nvkm_error(ibus, "ROP%d: %06x %08x (%08x)\n", i, addr, data, stat);
        nvkm_mask(device, 0x124128 + (i * 0x0800), 0x00000200, 0x00000000);
 }
 
 static void
-gk104_ibus_intr_gpc(struct nvkm_ibus *ibus, int i)
+gk104_ibus_intr_gpc(struct nvkm_subdev *ibus, int i)
 {
-       struct nvkm_subdev *subdev = &ibus->subdev;
-       struct nvkm_device *device = subdev->device;
+       struct nvkm_device *device = ibus->device;
        u32 addr = nvkm_rd32(device, 0x128120 + (i * 0x0800));
        u32 data = nvkm_rd32(device, 0x128124 + (i * 0x0800));
        u32 stat = nvkm_rd32(device, 0x128128 + (i * 0x0800));
-       nvkm_error(subdev, "GPC%d: %06x %08x (%08x)\n", i, addr, data, stat);
+       nvkm_error(ibus, "GPC%d: %06x %08x (%08x)\n", i, addr, data, stat);
        nvkm_mask(device, 0x128128 + (i * 0x0800), 0x00000200, 0x00000000);
 }
 
 static void
-gk104_ibus_intr(struct nvkm_subdev *subdev)
+gk104_ibus_intr(struct nvkm_subdev *ibus)
 {
-       struct nvkm_ibus *ibus = (void *)subdev;
-       struct nvkm_device *device = ibus->subdev.device;
+       struct nvkm_device *device = ibus->device;
        u32 intr0 = nvkm_rd32(device, 0x120058);
        u32 intr1 = nvkm_rd32(device, 0x12005c);
        u32 hubnr = nvkm_rd32(device, 0x120070);
 }
 
 static int
-gk104_ibus_init(struct nvkm_object *object)
+gk104_ibus_init(struct nvkm_subdev *ibus)
 {
-       struct nvkm_ibus *ibus = (void *)object;
-       struct nvkm_device *device = ibus->subdev.device;
-       int ret = nvkm_ibus_init(ibus);
-       if (ret == 0) {
-               nvkm_mask(device, 0x122318, 0x0003ffff, 0x00001000);
-               nvkm_mask(device, 0x12231c, 0x0003ffff, 0x00000200);
-               nvkm_mask(device, 0x122310, 0x0003ffff, 0x00000800);
-               nvkm_mask(device, 0x122348, 0x0003ffff, 0x00000100);
-               nvkm_mask(device, 0x1223b0, 0x0003ffff, 0x00000fff);
-               nvkm_mask(device, 0x122348, 0x0003ffff, 0x00000200);
-               nvkm_mask(device, 0x122358, 0x0003ffff, 0x00002880);
-       }
-       return ret;
+       struct nvkm_device *device = ibus->device;
+       nvkm_mask(device, 0x122318, 0x0003ffff, 0x00001000);
+       nvkm_mask(device, 0x12231c, 0x0003ffff, 0x00000200);
+       nvkm_mask(device, 0x122310, 0x0003ffff, 0x00000800);
+       nvkm_mask(device, 0x122348, 0x0003ffff, 0x00000100);
+       nvkm_mask(device, 0x1223b0, 0x0003ffff, 0x00000fff);
+       nvkm_mask(device, 0x122348, 0x0003ffff, 0x00000200);
+       nvkm_mask(device, 0x122358, 0x0003ffff, 0x00002880);
+       return 0;
 }
 
-static int
-gk104_ibus_ctor(struct nvkm_object *parent, struct nvkm_object *engine,
-               struct nvkm_oclass *oclass, void *data, u32 size,
-               struct nvkm_object **pobject)
-{
-       struct nvkm_ibus *ibus;
-       int ret;
-
-       ret = nvkm_ibus_create(parent, engine, oclass, &ibus);
-       *pobject = nv_object(ibus);
-       if (ret)
-               return ret;
+static const struct nvkm_subdev_func
+gk104_ibus = {
+       .preinit = gk104_ibus_init,
+       .init = gk104_ibus_init,
+       .intr = gk104_ibus_intr,
+};
 
-       nv_subdev(ibus)->intr = gk104_ibus_intr;
+int
+gk104_ibus_new(struct nvkm_device *device, int index,
+              struct nvkm_subdev **pibus)
+{
+       struct nvkm_subdev *ibus;
+       if (!(ibus = *pibus = kzalloc(sizeof(*ibus), GFP_KERNEL)))
+               return -ENOMEM;
+       nvkm_subdev_ctor(&gk104_ibus, device, index, 0, ibus);
        return 0;
 }
-
-struct nvkm_oclass
-gk104_ibus_oclass = {
-       .handle = NV_SUBDEV(IBUS, 0xe0),
-       .ofuncs = &(struct nvkm_ofuncs) {
-               .ctor = gk104_ibus_ctor,
-               .dtor = _nvkm_ibus_dtor,
-               .init = gk104_ibus_init,
-               .fini = _nvkm_ibus_fini,
-       },
-};
 
 #include <subdev/timer.h>
 
 static void
-gk20a_ibus_init_ibus_ring(struct nvkm_ibus *ibus)
+gk20a_ibus_init_ibus_ring(struct nvkm_subdev *ibus)
 {
-       struct nvkm_device *device = ibus->subdev.device;
+       struct nvkm_device *device = ibus->device;
        nvkm_mask(device, 0x137250, 0x3f, 0);
 
        nvkm_mask(device, 0x000200, 0x20, 0);
 }
 
 static void
-gk20a_ibus_intr(struct nvkm_subdev *subdev)
+gk20a_ibus_intr(struct nvkm_subdev *ibus)
 {
-       struct nvkm_ibus *ibus = (void *)subdev;
-       struct nvkm_device *device = ibus->subdev.device;
+       struct nvkm_device *device = ibus->device;
        u32 status0 = nvkm_rd32(device, 0x120058);
 
        if (status0 & 0x7) {
-               nvkm_debug(subdev, "resetting ibus ring\n");
+               nvkm_debug(ibus, "resetting ibus ring\n");
                gk20a_ibus_init_ibus_ring(ibus);
        }
 
 }
 
 static int
-gk20a_ibus_init(struct nvkm_object *object)
+gk20a_ibus_init(struct nvkm_subdev *ibus)
 {
-       struct nvkm_ibus *ibus = (void *)object;
-       int ret;
-
-       ret = _nvkm_ibus_init(object);
-       if (ret)
-               return ret;
-
        gk20a_ibus_init_ibus_ring(ibus);
-
        return 0;
 }
 
-static int
-gk20a_ibus_ctor(struct nvkm_object *parent, struct nvkm_object *engine,
-               struct nvkm_oclass *oclass, void *data, u32 size,
-               struct nvkm_object **pobject)
-{
-       struct nvkm_ibus *ibus;
-       int ret;
-
-       ret = nvkm_ibus_create(parent, engine, oclass, &ibus);
-       *pobject = nv_object(ibus);
-       if (ret)
-               return ret;
+static const struct nvkm_subdev_func
+gk20a_ibus = {
+       .init = gk20a_ibus_init,
+       .intr = gk20a_ibus_intr,
+};
 
-       nv_subdev(ibus)->intr = gk20a_ibus_intr;
+int
+gk20a_ibus_new(struct nvkm_device *device, int index,
+              struct nvkm_subdev **pibus)
+{
+       struct nvkm_subdev *ibus;
+       if (!(ibus = *pibus = kzalloc(sizeof(*ibus), GFP_KERNEL)))
+               return -ENOMEM;
+       nvkm_subdev_ctor(&gk20a_ibus, device, index, 0, ibus);
        return 0;
 }
-
-struct nvkm_oclass
-gk20a_ibus_oclass = {
-       .handle = NV_SUBDEV(IBUS, 0xea),
-       .ofuncs = &(struct nvkm_ofuncs) {
-               .ctor = gk20a_ibus_ctor,
-               .dtor = _nvkm_ibus_dtor,
-               .init = gk20a_ibus_init,
-               .fini = _nvkm_ibus_fini,
-       },
-};