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 nv50_fuse { 27 struct nvkm_fuse base; 28 29 spinlock_t fuse_enable_lock; 30 }; 31 32 static u32 33 nv50_fuse_read(struct nvkm_fuse *obj, u32 addr) 34 { 35 struct nv50_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, val; 39 40 /* racy if another part of nvkm start writing to this reg */ 41 spin_lock_irqsave(&fuse->fuse_enable_lock, flags); 42 fuse_enable = nvkm_mask(device, 0x1084, 0x800, 0x800); 43 val = nvkm_rd32(device, 0x21000 + addr); 44 nvkm_wr32(device, 0x1084, fuse_enable); 45 spin_unlock_irqrestore(&fuse->fuse_enable_lock, flags); 46 return val; 47 } 48 49 static const struct nvkm_fuse_func 50 nv50_fuse_func = { 51 .read = &nv50_fuse_read, 52 }; 53 54 static int 55 nv50_fuse_ctor(struct nvkm_object *parent, struct nvkm_object *engine, 56 struct nvkm_oclass *oclass, void *data, u32 size, 57 struct nvkm_object **pobject) 58 { 59 struct nv50_fuse *fuse; 60 int ret; 61 62 ret = nvkm_fuse_create(parent, engine, oclass, &fuse); 63 *pobject = nv_object(fuse); 64 if (ret) 65 return ret; 66 67 spin_lock_init(&fuse->fuse_enable_lock); 68 fuse->base.func = &nv50_fuse_func; 69 return 0; 70 } 71 72 struct nvkm_oclass 73 nv50_fuse_oclass = { 74 .handle = NV_SUBDEV(FUSE, 0x50), 75 .ofuncs = &(struct nvkm_ofuncs) { 76 .ctor = nv50_fuse_ctor, 77 .dtor = _nvkm_fuse_dtor, 78 .init = _nvkm_fuse_init, 79 .fini = _nvkm_fuse_fini, 80 }, 81 }; 82