c82baa28 |
1 | /* |
2 | * Copyright 2015 Advanced Micro Devices, 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 | */ |
23 | |
24 | #include <linux/types.h> |
25 | #include "atom-types.h" |
26 | #include "atombios.h" |
27 | #include "pppcielanes.h" |
28 | |
29 | /** \file |
30 | * Functions related to PCIe lane changes. |
31 | */ |
32 | |
33 | /* For converting from number of lanes to lane bits. */ |
34 | static const unsigned char pp_r600_encode_lanes[] = { |
35 | 0, /* 0 Not Supported */ |
36 | 1, /* 1 Lane */ |
37 | 2, /* 2 Lanes */ |
38 | 0, /* 3 Not Supported */ |
39 | 3, /* 4 Lanes */ |
40 | 0, /* 5 Not Supported */ |
41 | 0, /* 6 Not Supported */ |
42 | 0, /* 7 Not Supported */ |
43 | 4, /* 8 Lanes */ |
44 | 0, /* 9 Not Supported */ |
45 | 0, /* 10 Not Supported */ |
46 | 0, /* 11 Not Supported */ |
47 | 5, /* 12 Lanes (Not actually supported) */ |
48 | 0, /* 13 Not Supported */ |
49 | 0, /* 14 Not Supported */ |
50 | 0, /* 15 Not Supported */ |
51 | 6 /* 16 Lanes */ |
52 | }; |
53 | |
54 | static const unsigned char pp_r600_decoded_lanes[8] = { 16, 1, 2, 4, 8, 12, 16, }; |
55 | |
56 | uint8_t encode_pcie_lane_width(uint32_t num_lanes) |
57 | { |
58 | return pp_r600_encode_lanes[num_lanes]; |
59 | } |
60 | |
61 | uint8_t decode_pcie_lane_width(uint32_t num_lanes) |
62 | { |
63 | return pp_r600_decoded_lanes[num_lanes]; |
64 | } |