1 /* $NetBSD: amdgpu_pppcielanes.c,v 1.2 2021/12/18 23:45:26 riastradh Exp $ */
2
3 /*
4 * Copyright 2015 Advanced Micro Devices, 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 */
25
26 #include <sys/cdefs.h>
27 __KERNEL_RCSID(0, "$NetBSD: amdgpu_pppcielanes.c,v 1.2 2021/12/18 23:45:26 riastradh Exp $");
28
29 #include <linux/types.h>
30 #include "atom-types.h"
31 #include "atombios.h"
32 #include "pppcielanes.h"
33
34 /** \file
35 * Functions related to PCIe lane changes.
36 */
37
38 /* For converting from number of lanes to lane bits. */
39 static const unsigned char pp_r600_encode_lanes[] = {
40 0, /* 0 Not Supported */
41 1, /* 1 Lane */
42 2, /* 2 Lanes */
43 0, /* 3 Not Supported */
44 3, /* 4 Lanes */
45 0, /* 5 Not Supported */
46 0, /* 6 Not Supported */
47 0, /* 7 Not Supported */
48 4, /* 8 Lanes */
49 0, /* 9 Not Supported */
50 0, /* 10 Not Supported */
51 0, /* 11 Not Supported */
52 5, /* 12 Lanes (Not actually supported) */
53 0, /* 13 Not Supported */
54 0, /* 14 Not Supported */
55 0, /* 15 Not Supported */
56 6 /* 16 Lanes */
57 };
58
59 static const unsigned char pp_r600_decoded_lanes[8] = { 16, 1, 2, 4, 8, 12, 16, };
60
encode_pcie_lane_width(uint32_t num_lanes)61 uint8_t encode_pcie_lane_width(uint32_t num_lanes)
62 {
63 return pp_r600_encode_lanes[num_lanes];
64 }
65
decode_pcie_lane_width(uint32_t num_lanes)66 uint8_t decode_pcie_lane_width(uint32_t num_lanes)
67 {
68 return pp_r600_decoded_lanes[num_lanes];
69 }
70