1 /* $NetBSD: nouveau_nvkm_subdev_fuse_nv50.c,v 1.3 2021/12/18 23:45:39 riastradh Exp $ */
2
3 /*
4 * Copyright 2014 Martin Peres
5 *
6 * Permission is hereby granted, free of charge, to any person obtaining a
7 * copy of this software and associated documentation files (the "Software"),
8 * to deal in the Software without restriction, including without limitation
9 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
10 * and/or sell copies of the Software, and to permit persons to whom the
11 * Software is furnished to do so, subject to the following conditions:
12 *
13 * The above copyright notice and this permission notice shall be included in
14 * all copies or substantial portions of the Software.
15 *
16 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
17 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
18 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
19 * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
20 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
21 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
22 * OTHER DEALINGS IN THE SOFTWARE.
23 *
24 * Authors: Martin Peres
25 */
26 #include <sys/cdefs.h>
27 __KERNEL_RCSID(0, "$NetBSD: nouveau_nvkm_subdev_fuse_nv50.c,v 1.3 2021/12/18 23:45:39 riastradh Exp $");
28
29 #include "priv.h"
30
31 static u32
nv50_fuse_read(struct nvkm_fuse * fuse,u32 addr)32 nv50_fuse_read(struct nvkm_fuse *fuse, u32 addr)
33 {
34 struct nvkm_device *device = fuse->subdev.device;
35 unsigned long flags;
36 u32 fuse_enable, val;
37
38 /* racy if another part of nvkm start writing to this reg */
39 spin_lock_irqsave(&fuse->lock, flags);
40 fuse_enable = nvkm_mask(device, 0x001084, 0x800, 0x800);
41 val = nvkm_rd32(device, 0x021000 + addr);
42 nvkm_wr32(device, 0x001084, fuse_enable);
43 spin_unlock_irqrestore(&fuse->lock, flags);
44 return val;
45 }
46
47 static const struct nvkm_fuse_func
48 nv50_fuse = {
49 .read = &nv50_fuse_read,
50 };
51
52 int
nv50_fuse_new(struct nvkm_device * device,int index,struct nvkm_fuse ** pfuse)53 nv50_fuse_new(struct nvkm_device *device, int index, struct nvkm_fuse **pfuse)
54 {
55 return nvkm_fuse_new_(&nv50_fuse, device, index, pfuse);
56 }
57