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 }