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 static u32 27 gf100_fuse_read(struct nvkm_fuse *fuse, u32 addr) 28 { 29 struct nvkm_device *device = fuse->subdev.device; 30 unsigned long flags; 31 u32 fuse_enable, unk, val; 32 33 /* racy if another part of nvkm start writing to these regs */ 34 spin_lock_irqsave(&fuse->lock, flags); 35 fuse_enable = nvkm_mask(device, 0x022400, 0x800, 0x800); 36 unk = nvkm_mask(device, 0x021000, 0x1, 0x1); 37 val = nvkm_rd32(device, 0x021100 + addr); 38 nvkm_wr32(device, 0x021000, unk); 39 nvkm_wr32(device, 0x022400, fuse_enable); 40 spin_unlock_irqrestore(&fuse->lock, flags); 41 return val; 42 } 43 44 static const struct nvkm_fuse_func 45 gf100_fuse = { 46 .read = gf100_fuse_read, 47 }; 48 49 int 50 gf100_fuse_new(struct nvkm_device *device, int index, struct nvkm_fuse **pfuse) 51 { 52 return nvkm_fuse_new_(&gf100_fuse, device, index, pfuse); 53 } 54