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
encode_pcie_lane_width(uint32_t num_lanes)56 uint8_t encode_pcie_lane_width(uint32_t num_lanes)
57 {
58 return pp_r600_encode_lanes[num_lanes];
59 }
60
decode_pcie_lane_width(uint32_t num_lanes)61 uint8_t decode_pcie_lane_width(uint32_t num_lanes)
62 {
63 return pp_r600_decoded_lanes[num_lanes];
64 }
65