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, enum nvkm_subdev_type type, int inst,
51 	       struct nvkm_fuse **pfuse)
52 {
53 	return nvkm_fuse_new_(&gf100_fuse, device, type, inst, pfuse);
54 }
55