1 /* $NetBSD: nouveau_nvkm_subdev_bios_vpstate.c,v 1.2 2021/12/18 23:45:38 riastradh Exp $ */
2
3 /*
4 * Copyright 2016 Karol Herbst
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: Karol Herbst
25 */
26 #include <sys/cdefs.h>
27 __KERNEL_RCSID(0, "$NetBSD: nouveau_nvkm_subdev_bios_vpstate.c,v 1.2 2021/12/18 23:45:38 riastradh Exp $");
28
29 #include <subdev/bios.h>
30 #include <subdev/bios/bit.h>
31 #include <subdev/bios/vpstate.h>
32
33 static u32
nvbios_vpstate_offset(struct nvkm_bios * b)34 nvbios_vpstate_offset(struct nvkm_bios *b)
35 {
36 struct bit_entry bit_P;
37
38 if (!bit_entry(b, 'P', &bit_P)) {
39 if (bit_P.version == 2 && bit_P.length >= 0x3c)
40 return nvbios_rd32(b, bit_P.offset + 0x38);
41 }
42
43 return 0x0000;
44 }
45
46 int
nvbios_vpstate_parse(struct nvkm_bios * b,struct nvbios_vpstate_header * h)47 nvbios_vpstate_parse(struct nvkm_bios *b, struct nvbios_vpstate_header *h)
48 {
49 if (!h)
50 return -EINVAL;
51
52 h->offset = nvbios_vpstate_offset(b);
53 if (!h->offset)
54 return -ENODEV;
55
56 h->version = nvbios_rd08(b, h->offset);
57 switch (h->version) {
58 case 0x10:
59 h->hlen = nvbios_rd08(b, h->offset + 0x1);
60 h->elen = nvbios_rd08(b, h->offset + 0x2);
61 h->slen = nvbios_rd08(b, h->offset + 0x3);
62 h->scount = nvbios_rd08(b, h->offset + 0x4);
63 h->ecount = nvbios_rd08(b, h->offset + 0x5);
64
65 h->base_id = nvbios_rd08(b, h->offset + 0x0f);
66 if (h->hlen > 0x10)
67 h->boost_id = nvbios_rd08(b, h->offset + 0x10);
68 else
69 h->boost_id = 0xff;
70 if (h->hlen > 0x11)
71 h->tdp_id = nvbios_rd08(b, h->offset + 0x11);
72 else
73 h->tdp_id = 0xff;
74 return 0;
75 default:
76 return -EINVAL;
77 }
78 }
79
80 int
nvbios_vpstate_entry(struct nvkm_bios * b,struct nvbios_vpstate_header * h,u8 idx,struct nvbios_vpstate_entry * e)81 nvbios_vpstate_entry(struct nvkm_bios *b, struct nvbios_vpstate_header *h,
82 u8 idx, struct nvbios_vpstate_entry *e)
83 {
84 u32 offset;
85
86 if (!e || !h || idx > h->ecount)
87 return -EINVAL;
88
89 offset = h->offset + h->hlen + idx * (h->elen + (h->slen * h->scount));
90 e->pstate = nvbios_rd08(b, offset);
91 e->clock_mhz = nvbios_rd16(b, offset + 0x5);
92 return 0;
93 }
94