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 } 65