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