1 /* $NetBSD: nouveau_nvkm_subdev_bios_ramcfg.c,v 1.3 2021/12/18 23:45:38 riastradh Exp $ */
2
3 /*
4 * Copyright 2013 Red Hat Inc.
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: Ben Skeggs <bskeggs@redhat.com>
25 */
26 #include <sys/cdefs.h>
27 __KERNEL_RCSID(0, "$NetBSD: nouveau_nvkm_subdev_bios_ramcfg.c,v 1.3 2021/12/18 23:45:38 riastradh Exp $");
28
29 #include <subdev/bios.h>
30 #include <subdev/bios/bit.h>
31 #include <subdev/bios/ramcfg.h>
32 #include <subdev/bios/M0203.h>
33
34 static u8
nvbios_ramcfg_strap(struct nvkm_subdev * subdev)35 nvbios_ramcfg_strap(struct nvkm_subdev *subdev)
36 {
37 return (nvkm_rd32(subdev->device, 0x101000) & 0x0000003c) >> 2;
38 }
39
40 u8
nvbios_ramcfg_count(struct nvkm_bios * bios)41 nvbios_ramcfg_count(struct nvkm_bios *bios)
42 {
43 struct bit_entry bit_M;
44
45 if (!bit_entry(bios, 'M', &bit_M)) {
46 if (bit_M.version == 1 && bit_M.length >= 5)
47 return nvbios_rd08(bios, bit_M.offset + 2);
48 if (bit_M.version == 2 && bit_M.length >= 3)
49 return nvbios_rd08(bios, bit_M.offset + 0);
50 }
51
52 return 0x00;
53 }
54
55 u8
nvbios_ramcfg_index(struct nvkm_subdev * subdev)56 nvbios_ramcfg_index(struct nvkm_subdev *subdev)
57 {
58 struct nvkm_bios *bios = subdev->device->bios;
59 u8 strap = nvbios_ramcfg_strap(subdev);
60 u32 xlat = 0x00000000;
61 struct bit_entry bit_M;
62 struct nvbios_M0203E M0203E;
63 u8 ver, hdr;
64
65 if (!bit_entry(bios, 'M', &bit_M)) {
66 if (bit_M.version == 1 && bit_M.length >= 5)
67 xlat = nvbios_rd16(bios, bit_M.offset + 3);
68 if (bit_M.version == 2 && bit_M.length >= 3) {
69 /*XXX: is M ever shorter than this?
70 * if not - what is xlat used for now?
71 * also - sigh..
72 */
73 if (bit_M.length >= 7 &&
74 nvbios_M0203Em(bios, strap, &ver, &hdr, &M0203E))
75 return M0203E.group;
76 xlat = nvbios_rd16(bios, bit_M.offset + 1);
77 }
78 }
79
80 if (xlat)
81 strap = nvbios_rd08(bios, xlat + strap);
82 return strap;
83 }
84