1 /*
2  * Copyright 2016 Karol Herbst
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: Karol Herbst
23  */
24 #include "priv.h"
25 
26 #include <subdev/fuse.h>
27 
28 static int
29 gf100_volt_speedo_read(struct nvkm_volt *volt)
30 {
31 	struct nvkm_device *device = volt->subdev.device;
32 	struct nvkm_fuse *fuse = device->fuse;
33 
34 	if (!fuse)
35 		return -EINVAL;
36 
37 	return nvkm_fuse_read(fuse, 0x1cc);
38 }
39 
40 int
41 gf100_volt_oneinit(struct nvkm_volt *volt)
42 {
43 	struct nvkm_subdev *subdev = &volt->subdev;
44 	if (volt->speedo <= 0)
45 		nvkm_error(subdev, "couldn't find speedo value, volting not "
46 			   "possible\n");
47 	return 0;
48 }
49 
50 static const struct nvkm_volt_func
51 gf100_volt = {
52 	.oneinit = gf100_volt_oneinit,
53 	.vid_get = nvkm_voltgpio_get,
54 	.vid_set = nvkm_voltgpio_set,
55 	.speedo_read = gf100_volt_speedo_read,
56 };
57 
58 int
59 gf100_volt_new(struct nvkm_device *device, enum nvkm_subdev_type type, int inst,
60 	       struct nvkm_volt **pvolt)
61 {
62 	struct nvkm_volt *volt;
63 	int ret;
64 
65 	ret = nvkm_volt_new_(&gf100_volt, device, type, inst, &volt);
66 	*pvolt = volt;
67 	if (ret)
68 		return ret;
69 
70 	return nvkm_voltgpio_init(volt);
71 }
72