1/*	$NetBSD: nouveau_nvkm_subdev_bios_M0203.c,v 1.3 2021/12/18 23:45:38 riastradh Exp $	*/
2
3/*
4 * Copyright 2014 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
25 */
26#include <sys/cdefs.h>
27__KERNEL_RCSID(0, "$NetBSD: nouveau_nvkm_subdev_bios_M0203.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/M0203.h>
32
33u32
34nvbios_M0203Te(struct nvkm_bios *bios, u8 *ver, u8 *hdr, u8 *cnt, u8 *len)
35{
36	struct bit_entry bit_M;
37	u32 data = 0x00000000;
38
39	if (!bit_entry(bios, 'M', &bit_M)) {
40		if (bit_M.version == 2 && bit_M.length > 0x04)
41			data = nvbios_rd16(bios, bit_M.offset + 0x03);
42		if (data) {
43			*ver = nvbios_rd08(bios, data + 0x00);
44			switch (*ver) {
45			case 0x10:
46				*hdr = nvbios_rd08(bios, data + 0x01);
47				*len = nvbios_rd08(bios, data + 0x02);
48				*cnt = nvbios_rd08(bios, data + 0x03);
49				return data;
50			default:
51				break;
52			}
53		}
54	}
55
56	return 0x00000000;
57}
58
59u32
60nvbios_M0203Tp(struct nvkm_bios *bios, u8 *ver, u8 *hdr, u8 *cnt, u8 *len,
61	       struct nvbios_M0203T *info)
62{
63	u32 data = nvbios_M0203Te(bios, ver, hdr, cnt, len);
64	memset(info, 0x00, sizeof(*info));
65	switch (!!data * *ver) {
66	case 0x10:
67		info->type    = nvbios_rd08(bios, data + 0x04);
68		info->pointer = nvbios_rd16(bios, data + 0x05);
69		break;
70	default:
71		break;
72	}
73	return data;
74}
75
76u32
77nvbios_M0203Ee(struct nvkm_bios *bios, int idx, u8 *ver, u8 *hdr)
78{
79	u8  cnt, len;
80	u32 data = nvbios_M0203Te(bios, ver, hdr, &cnt, &len);
81	if (data && idx < cnt) {
82		data = data + *hdr + idx * len;
83		*hdr = len;
84		return data;
85	}
86	return 0x00000000;
87}
88
89u32
90nvbios_M0203Ep(struct nvkm_bios *bios, int idx, u8 *ver, u8 *hdr,
91	       struct nvbios_M0203E *info)
92{
93	u32 data = nvbios_M0203Ee(bios, idx, ver, hdr);
94	memset(info, 0x00, sizeof(*info));
95	switch (!!data * *ver) {
96	case 0x10:
97		info->type  = (nvbios_rd08(bios, data + 0x00) & 0x0f) >> 0;
98		info->strap = (nvbios_rd08(bios, data + 0x00) & 0xf0) >> 4;
99		info->group = (nvbios_rd08(bios, data + 0x01) & 0x0f) >> 0;
100		return data;
101	default:
102		break;
103	}
104	return 0x00000000;
105}
106
107u32
108nvbios_M0203Em(struct nvkm_bios *bios, u8 ramcfg, u8 *ver, u8 *hdr,
109	       struct nvbios_M0203E *info)
110{
111	struct nvkm_subdev *subdev = &bios->subdev;
112	struct nvbios_M0203T M0203T;
113	u8  cnt, len, idx = 0xff;
114	u32 data;
115
116	if (!nvbios_M0203Tp(bios, ver, hdr, &cnt, &len, &M0203T)) {
117		nvkm_warn(subdev, "M0203T not found\n");
118		return 0x00000000;
119	}
120
121	while ((data = nvbios_M0203Ep(bios, ++idx, ver, hdr, info))) {
122		switch (M0203T.type) {
123		case M0203T_TYPE_RAMCFG:
124			if (info->strap != ramcfg)
125				continue;
126			return data;
127		default:
128			nvkm_warn(subdev, "M0203T type %02x\n", M0203T.type);
129			return 0x00000000;
130		}
131	}
132
133	return data;
134}
135