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