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
25
26 #include "subdev/bios.h"
27 #include "subdev/bios/dcb.h"
28 #include "subdev/bios/i2c.h"
29
30 u16
dcb_i2c_table(struct nouveau_bios * bios,u8 * ver,u8 * hdr,u8 * cnt,u8 * len)31 dcb_i2c_table(struct nouveau_bios *bios, u8 *ver, u8 *hdr, u8 *cnt, u8 *len)
32 {
33 u16 i2c = 0x0000;
34 u16 dcb = dcb_table(bios, ver, hdr, cnt, len);
35 if (dcb) {
36 if (*ver >= 0x15)
37 i2c = nv_ro16(bios, dcb + 2);
38 if (*ver >= 0x30)
39 i2c = nv_ro16(bios, dcb + 4);
40 }
41
42 if (i2c && *ver >= 0x30) {
43 *ver = nv_ro08(bios, i2c + 0);
44 *hdr = nv_ro08(bios, i2c + 1);
45 *cnt = nv_ro08(bios, i2c + 2);
46 *len = nv_ro08(bios, i2c + 3);
47 } else {
48 *ver = *ver; /* use DCB version */
49 *hdr = 0;
50 *cnt = 16;
51 *len = 4;
52 }
53
54 return i2c;
55 }
56
57 u16
dcb_i2c_entry(struct nouveau_bios * bios,u8 idx,u8 * ver,u8 * len)58 dcb_i2c_entry(struct nouveau_bios *bios, u8 idx, u8 *ver, u8 *len)
59 {
60 u8 hdr, cnt;
61 u16 i2c = dcb_i2c_table(bios, ver, &hdr, &cnt, len);
62 if (i2c && idx < cnt)
63 return i2c + hdr + (idx * *len);
64 return 0x0000;
65 }
66
67 int
dcb_i2c_parse(struct nouveau_bios * bios,u8 idx,struct dcb_i2c_entry * info)68 dcb_i2c_parse(struct nouveau_bios *bios, u8 idx, struct dcb_i2c_entry *info)
69 {
70 u8 ver, len;
71 u16 ent = dcb_i2c_entry(bios, idx, &ver, &len);
72 if (ent) {
73 info->type = nv_ro08(bios, ent + 3);
74 info->share = DCB_I2C_UNUSED;
75 if (ver < 0x30) {
76 info->type &= 0x07;
77 if (info->type == 0x07)
78 info->type = DCB_I2C_UNUSED;
79 }
80
81 switch (info->type) {
82 case DCB_I2C_NV04_BIT:
83 info->drive = nv_ro08(bios, ent + 0);
84 info->sense = nv_ro08(bios, ent + 1);
85 return 0;
86 case DCB_I2C_NV4E_BIT:
87 info->drive = nv_ro08(bios, ent + 1);
88 return 0;
89 case DCB_I2C_NVIO_BIT:
90 case DCB_I2C_NVIO_AUX:
91 info->drive = nv_ro08(bios, ent + 0) & 0x0f;
92 if (nv_ro08(bios, ent + 1) & 0x01) {
93 info->share = nv_ro08(bios, ent + 1) >> 1;
94 info->share &= 0x0f;
95 }
96 return 0;
97 case DCB_I2C_UNUSED:
98 return 0;
99 default:
100 nv_warn(bios, "unknown i2c type %d\n", info->type);
101 info->type = DCB_I2C_UNUSED;
102 return 0;
103 }
104 }
105
106 if (bios->bmp_offset && idx < 2) {
107 /* BMP (from v4.0 has i2c info in the structure, it's in a
108 * fixed location on earlier VBIOS
109 */
110 if (nv_ro08(bios, bios->bmp_offset + 5) < 4)
111 ent = 0x0048;
112 else
113 ent = 0x0036 + bios->bmp_offset;
114
115 if (idx == 0) {
116 info->drive = nv_ro08(bios, ent + 4);
117 if (!info->drive) info->drive = 0x3f;
118 info->sense = nv_ro08(bios, ent + 5);
119 if (!info->sense) info->sense = 0x3e;
120 } else
121 if (idx == 1) {
122 info->drive = nv_ro08(bios, ent + 6);
123 if (!info->drive) info->drive = 0x37;
124 info->sense = nv_ro08(bios, ent + 7);
125 if (!info->sense) info->sense = 0x36;
126 }
127
128 info->type = DCB_I2C_NV04_BIT;
129 info->share = DCB_I2C_UNUSED;
130 return 0;
131 }
132
133 return -ENOENT;
134 }
135