Linux Kernel  3.7.1
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conn.c
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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 #include <core/device.h>
26 
27 #include <subdev/bios.h>
28 #include <subdev/bios/dcb.h>
29 #include <subdev/bios/conn.h>
30 
31 u16
32 dcb_conntab(struct nouveau_bios *bios, u8 *ver, u8 *hdr, u8 *cnt, u8 *len)
33 {
34  u16 dcb = dcb_table(bios, ver, hdr, cnt, len);
35  if (dcb && *ver >= 0x30 && *hdr >= 0x16) {
36  u16 data = nv_ro16(bios, dcb + 0x14);
37  if (data) {
38  *ver = nv_ro08(bios, data + 0);
39  *hdr = nv_ro08(bios, data + 1);
40  *cnt = nv_ro08(bios, data + 2);
41  *len = nv_ro08(bios, data + 3);
42  return data;
43  }
44  }
45  return 0x0000;
46 }
47 
48 u16
49 dcb_conn(struct nouveau_bios *bios, u8 idx, u8 *ver, u8 *len)
50 {
51  u8 hdr, cnt;
52  u16 data = dcb_conntab(bios, ver, &hdr, &cnt, len);
53  if (data && idx < cnt)
54  return data + hdr + (idx * *len);
55  return 0x0000;
56 }