powerplay/hwmgr/pppcielanes.c

0001 /*
0002  * Copyright 2015 Advanced Micro Devices, Inc.
0003  *
0004  * Permission is hereby granted, free of charge, to any person obtaining a
0005  * copy of this software and associated documentation files (the "Software"),
0006  * to deal in the Software without restriction, including without limitation
0007  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
0008  * and/or sell copies of the Software, and to permit persons to whom the
0009  * Software is furnished to do so, subject to the following conditions:
0010  *
0011  * The above copyright notice and this permission notice shall be included in
0012  * all copies or substantial portions of the Software.
0013  *
0014  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
0015  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
0016  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
0017  * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
0018  * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
0019  * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
0020  * OTHER DEALINGS IN THE SOFTWARE.
0021  *
0022  */
0023
0024 #include <linux/types.h>
0025 #include "atom-types.h"
0026 #include "atombios.h"
0027 #include "pppcielanes.h"
0028
0029 /** \file
0030  * Functions related to PCIe lane changes.
0031  */
0032
0033 /* For converting from number of lanes to lane bits.  */
0034 static const unsigned char pp_r600_encode_lanes[] = {
0035     0,          /*  0 Not Supported  */
0036     1,          /*  1 Lane  */
0037     2,          /*  2 Lanes  */
0038     0,          /*  3 Not Supported  */
0039     3,          /*  4 Lanes  */
0040     0,          /*  5 Not Supported  */
0041     0,          /*  6 Not Supported  */
0042     0,          /*  7 Not Supported  */
0043     4,          /*  8 Lanes  */
0044     0,          /*  9 Not Supported  */
0045     0,          /* 10 Not Supported  */
0046     0,          /* 11 Not Supported  */
0047     5,          /* 12 Lanes (Not actually supported)  */
0048     0,          /* 13 Not Supported  */
0049     0,          /* 14 Not Supported  */
0050     0,          /* 15 Not Supported  */
0051     6           /* 16 Lanes  */
0052 };
0053
0054 static const unsigned char pp_r600_decoded_lanes[8] = { 16, 1, 2, 4, 8, 12, 16, };
0055
0056 uint8_t encode_pcie_lane_width(uint32_t num_lanes)
0057 {
0058     return pp_r600_encode_lanes[num_lanes];
0059 }
0060
0061 uint8_t decode_pcie_lane_width(uint32_t num_lanes)
0062 {
0063     return pp_r600_decoded_lanes[num_lanes];
0064 }