1 /*
2 * Copyright 2012 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
23 */
24 #include <subdev/bios.h>
25 #include <subdev/bios/dcb.h>
26 #include <subdev/bios/i2c.h>
27
28 u16
dcb_i2c_table(struct nvkm_bios * bios,u8 * ver,u8 * hdr,u8 * cnt,u8 * len)29 dcb_i2c_table(struct nvkm_bios *bios, u8 *ver, u8 *hdr, u8 *cnt, u8 *len)
30 {
31 u16 i2c = 0x0000;
32 u16 dcb = dcb_table(bios, ver, hdr, cnt, len);
33 if (dcb) {
34 if (*ver >= 0x15)
35 i2c = nvbios_rd16(bios, dcb + 2);
36 if (*ver >= 0x30)
37 i2c = nvbios_rd16(bios, dcb + 4);
38 }
39
40 if (i2c && *ver >= 0x42) {
41 nvkm_warn(&bios->subdev, "ccb %02x not supported\n", *ver);
42 return 0x0000;
43 }
44
45 if (i2c && *ver >= 0x30) {
46 *ver = nvbios_rd08(bios, i2c + 0);
47 *hdr = nvbios_rd08(bios, i2c + 1);
48 *cnt = nvbios_rd08(bios, i2c + 2);
49 *len = nvbios_rd08(bios, i2c + 3);
50 } else {
51 *ver = *ver; /* use DCB version */
52 *hdr = 0;
53 *cnt = 16;
54 *len = 4;
55 }
56
57 return i2c;
58 }
59
60 u16
dcb_i2c_entry(struct nvkm_bios * bios,u8 idx,u8 * ver,u8 * len)61 dcb_i2c_entry(struct nvkm_bios *bios, u8 idx, u8 *ver, u8 *len)
62 {
63 u8 hdr, cnt;
64 u16 i2c = dcb_i2c_table(bios, ver, &hdr, &cnt, len);
65 if (i2c && idx < cnt)
66 return i2c + hdr + (idx * *len);
67 return 0x0000;
68 }
69
70 int
dcb_i2c_parse(struct nvkm_bios * bios,u8 idx,struct dcb_i2c_entry * info)71 dcb_i2c_parse(struct nvkm_bios *bios, u8 idx, struct dcb_i2c_entry *info)
72 {
73 struct nvkm_subdev *subdev = &bios->subdev;
74 u8 ver, len;
75 u16 ent = dcb_i2c_entry(bios, idx, &ver, &len);
76 if (ent) {
77 if (ver >= 0x41) {
78 u32 ent_value = nvbios_rd32(bios, ent);
79 u8 i2c_port = (ent_value >> 0) & 0x1f;
80 u8 dpaux_port = (ent_value >> 5) & 0x1f;
81 /* value 0x1f means unused according to DCB 4.x spec */
82 if (i2c_port == 0x1f && dpaux_port == 0x1f)
83 info->type = DCB_I2C_UNUSED;
84 else
85 info->type = DCB_I2C_PMGR;
86 } else
87 if (ver >= 0x30) {
88 info->type = nvbios_rd08(bios, ent + 0x03);
89 } else {
90 info->type = nvbios_rd08(bios, ent + 0x03) & 0x07;
91 if (info->type == 0x07)
92 info->type = DCB_I2C_UNUSED;
93 }
94
95 info->drive = DCB_I2C_UNUSED;
96 info->sense = DCB_I2C_UNUSED;
97 info->share = DCB_I2C_UNUSED;
98 info->auxch = DCB_I2C_UNUSED;
99
100 switch (info->type) {
101 case DCB_I2C_NV04_BIT:
102 info->drive = nvbios_rd08(bios, ent + 0);
103 info->sense = nvbios_rd08(bios, ent + 1);
104 return 0;
105 case DCB_I2C_NV4E_BIT:
106 info->drive = nvbios_rd08(bios, ent + 1);
107 return 0;
108 case DCB_I2C_NVIO_BIT:
109 info->drive = nvbios_rd08(bios, ent + 0) & 0x0f;
110 if (nvbios_rd08(bios, ent + 1) & 0x01)
111 info->share = nvbios_rd08(bios, ent + 1) >> 1;
112 return 0;
113 case DCB_I2C_NVIO_AUX:
114 info->auxch = nvbios_rd08(bios, ent + 0) & 0x0f;
115 if (nvbios_rd08(bios, ent + 1) & 0x01)
116 info->share = info->auxch;
117 return 0;
118 case DCB_I2C_PMGR:
119 info->drive = (nvbios_rd16(bios, ent + 0) & 0x01f) >> 0;
120 if (info->drive == 0x1f)
121 info->drive = DCB_I2C_UNUSED;
122 info->auxch = (nvbios_rd16(bios, ent + 0) & 0x3e0) >> 5;
123 if (info->auxch == 0x1f)
124 info->auxch = DCB_I2C_UNUSED;
125 info->share = info->auxch;
126 return 0;
127 case DCB_I2C_UNUSED:
128 return 0;
129 default:
130 nvkm_warn(subdev, "unknown i2c type %d\n", info->type);
131 info->type = DCB_I2C_UNUSED;
132 return 0;
133 }
134 }
135
136 if (bios->bmp_offset && idx < 2) {
137 /* BMP (from v4.0 has i2c info in the structure, it's in a
138 * fixed location on earlier VBIOS
139 */
140 if (nvbios_rd08(bios, bios->bmp_offset + 5) < 4)
141 ent = 0x0048;
142 else
143 ent = 0x0036 + bios->bmp_offset;
144
145 if (idx == 0) {
146 info->drive = nvbios_rd08(bios, ent + 4);
147 if (!info->drive) info->drive = 0x3f;
148 info->sense = nvbios_rd08(bios, ent + 5);
149 if (!info->sense) info->sense = 0x3e;
150 } else
151 if (idx == 1) {
152 info->drive = nvbios_rd08(bios, ent + 6);
153 if (!info->drive) info->drive = 0x37;
154 info->sense = nvbios_rd08(bios, ent + 7);
155 if (!info->sense) info->sense = 0x36;
156 }
157
158 info->type = DCB_I2C_NV04_BIT;
159 info->share = DCB_I2C_UNUSED;
160 return 0;
161 }
162
163 return -ENOENT;
164 }
165