1 /* 2 * Copyright 2014 Martin Peres 3 * 4 * Permission is hereby granted, free of charge, to any person obtaining a 5 * copy of this software and associated documentation files (the "Software"), 6 * to deal in the Software without restriction, including without limitation 7 * the rights to use, copy, modify, merge, publish, distribute, sublicense, 8 * and/or sell copies of the Software, and to permit persons to whom the 9 * Software is furnished to do so, subject to the following conditions: 10 * 11 * The above copyright notice and this permission notice shall be included in 12 * all copies or substantial portions of the Software. 13 * 14 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 15 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 16 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL 17 * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR 18 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, 19 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR 20 * OTHER DEALINGS IN THE SOFTWARE. 21 * 22 * Authors: Martin Peres 23 */ 24 #include "priv.h" 25 26 struct gf100_fuse { 27 struct nvkm_fuse base; 28 29 spinlock_t fuse_enable_lock; 30 }; 31 32 static u32 33 gf100_fuse_read(struct nvkm_fuse *obj, u32 addr) 34 { 35 struct gf100_fuse *fuse = container_of(obj, typeof(*fuse), base); 36 struct nvkm_device *device = fuse->base.subdev.device; 37 unsigned long flags; 38 u32 fuse_enable, unk, val; 39 40 /* racy if another part of nvkm start writing to these regs */ 41 spin_lock_irqsave(&fuse->fuse_enable_lock, flags); 42 fuse_enable = nvkm_mask(device, 0x22400, 0x800, 0x800); 43 unk = nvkm_mask(device, 0x21000, 0x1, 0x1); 44 val = nvkm_rd32(device, 0x21100 + addr); 45 nvkm_wr32(device, 0x21000, unk); 46 nvkm_wr32(device, 0x22400, fuse_enable); 47 spin_unlock_irqrestore(&fuse->fuse_enable_lock, flags); 48 return val; 49 } 50 51 static const struct nvkm_fuse_func 52 gf100_fuse_func = { 53 .read = gf100_fuse_read, 54 }; 55 56 static int 57 gf100_fuse_ctor(struct nvkm_object *parent, struct nvkm_object *engine, 58 struct nvkm_oclass *oclass, void *data, u32 size, 59 struct nvkm_object **pobject) 60 { 61 struct gf100_fuse *fuse; 62 int ret; 63 64 ret = nvkm_fuse_create(parent, engine, oclass, &fuse); 65 *pobject = nv_object(fuse); 66 if (ret) 67 return ret; 68 69 spin_lock_init(&fuse->fuse_enable_lock); 70 fuse->base.func = &gf100_fuse_func; 71 return 0; 72 } 73 74 struct nvkm_oclass 75 gf100_fuse_oclass = { 76 .handle = NV_SUBDEV(FUSE, 0xC0), 77 .ofuncs = &(struct nvkm_ofuncs) { 78 .ctor = gf100_fuse_ctor, 79 .dtor = _nvkm_fuse_dtor, 80 .init = _nvkm_fuse_init, 81 .fini = _nvkm_fuse_fini, 82 }, 83 }; 84