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.  */
34static 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
54static const unsigned char pp_r600_decoded_lanes[8] = { 16, 1, 2, 4, 8, 12, 16, };
55
56uint8_t encode_pcie_lane_width(uint32_t num_lanes)
57{
58	return pp_r600_encode_lanes[num_lanes];
59}
60
61uint8_t decode_pcie_lane_width(uint32_t num_lanes)
62{
63	return pp_r600_decoded_lanes[num_lanes];
64}
65