1/* $NetBSD: nouveau_subdev_bios_i2c.c,v 1.1.1.1 2014/08/06 12:36:28 riastradh Exp $ */
2
3/*
4 * Copyright 2012 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
27
28#include <sys/cdefs.h>
29__KERNEL_RCSID(0, "$NetBSD: nouveau_subdev_bios_i2c.c,v 1.1.1.1 2014/08/06 12:36:28 riastradh Exp $");
30
31#include "subdev/bios.h"
32#include "subdev/bios/dcb.h"
33#include "subdev/bios/i2c.h"
34
35u16
36dcb_i2c_table(struct nouveau_bios *bios, u8 *ver, u8 *hdr, u8 *cnt, u8 *len)
37{
38 u16 i2c = 0x0000;
39 u16 dcb = dcb_table(bios, ver, hdr, cnt, len);
40 if (dcb) {
41 if (*ver >= 0x15)
42 i2c = nv_ro16(bios, dcb + 2);
43 if (*ver >= 0x30)
44 i2c = nv_ro16(bios, dcb + 4);
45 }
46
47 if (i2c && *ver >= 0x30) {
48 *ver = nv_ro08(bios, i2c + 0);
49 *hdr = nv_ro08(bios, i2c + 1);
50 *cnt = nv_ro08(bios, i2c + 2);
51 *len = nv_ro08(bios, i2c + 3);
52 } else {
53 *ver = *ver; /* use DCB version */
54 *hdr = 0;
55 *cnt = 16;
56 *len = 4;
57 }
58
59 return i2c;
60}
61
62u16
63dcb_i2c_entry(struct nouveau_bios *bios, u8 idx, u8 *ver, u8 *len)
64{
65 u8 hdr, cnt;
66 u16 i2c = dcb_i2c_table(bios, ver, &hdr, &cnt, len);
67 if (i2c && idx < cnt)
68 return i2c + hdr + (idx * *len);
69 return 0x0000;
70}
71
72int
73dcb_i2c_parse(struct nouveau_bios *bios, u8 idx, struct dcb_i2c_entry *info)
74{
75 u8 ver, len;
76 u16 ent = dcb_i2c_entry(bios, idx, &ver, &len);
77 if (ent) {
78 info->type = nv_ro08(bios, ent + 3);
79 info->share = DCB_I2C_UNUSED;
80 if (ver < 0x30) {
81 info->type &= 0x07;
82 if (info->type == 0x07)
83 info->type = DCB_I2C_UNUSED;
84 }
85
86 switch (info->type) {
87 case DCB_I2C_NV04_BIT:
88 info->drive = nv_ro08(bios, ent + 0);
89 info->sense = nv_ro08(bios, ent + 1);
90 return 0;
91 case DCB_I2C_NV4E_BIT:
92 info->drive = nv_ro08(bios, ent + 1);
93 return 0;
94 case DCB_I2C_NVIO_BIT:
95 case DCB_I2C_NVIO_AUX:
96 info->drive = nv_ro08(bios, ent + 0) & 0x0f;
97 if (nv_ro08(bios, ent + 1) & 0x01) {
98 info->share = nv_ro08(bios, ent + 1) >> 1;
99 info->share &= 0x0f;
100 }
101 return 0;
102 case DCB_I2C_UNUSED:
103 return 0;
104 default:
105 nv_warn(bios, "unknown i2c type %d\n", info->type);
106 info->type = DCB_I2C_UNUSED;
107 return 0;
108 }
109 }
110
111 if (bios->bmp_offset && idx < 2) {
112 /* BMP (from v4.0 has i2c info in the structure, it's in a
113 * fixed location on earlier VBIOS
114 */
115 if (nv_ro08(bios, bios->bmp_offset + 5) < 4)
116 ent = 0x0048;
117 else
118 ent = 0x0036 + bios->bmp_offset;
119
120 if (idx == 0) {
121 info->drive = nv_ro08(bios, ent + 4);
122 if (!info->drive) info->drive = 0x3f;
123 info->sense = nv_ro08(bios, ent + 5);
124 if (!info->sense) info->sense = 0x3e;
125 } else
126 if (idx == 1) {
127 info->drive = nv_ro08(bios, ent + 6);
128 if (!info->drive) info->drive = 0x37;
129 info->sense = nv_ro08(bios, ent + 7);
130 if (!info->sense) info->sense = 0x36;
131 }
132
133 info->type = DCB_I2C_NV04_BIT;
134 info->share = DCB_I2C_UNUSED;
135 return 0;
136 }
137
138 return -ENOENT;
139}
140