| 1 | /* |
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| 2 | * Copyright 2015 Advanced Micro Devices, Inc. |
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| 3 | * |
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| 4 | * Permission is hereby granted, free of charge, to any person obtaining a |
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| 5 | * copy of this software and associated documentation files (the "Software"), |
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| 6 | * to deal in the Software without restriction, including without limitation |
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| 7 | * the rights to use, copy, modify, merge, publish, distribute, sublicense, |
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| 8 | * and/or sell copies of the Software, and to permit persons to whom the |
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| 9 | * Software is furnished to do so, subject to the following conditions: |
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| 10 | * |
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| 11 | * The above copyright notice and this permission notice shall be included in |
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| 12 | * all copies or substantial portions of the Software. |
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| 13 | * |
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| 14 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
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| 15 | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
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| 16 | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL |
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| 17 | * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR |
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| 18 | * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, |
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| 19 | * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR |
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| 20 | * OTHER DEALINGS IN THE SOFTWARE. |
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| 21 | * |
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| 22 | */ |
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| 23 | |
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| 24 | #include <linux/types.h> |
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| 25 | #include "atom-types.h" |
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| 26 | #include "atombios.h" |
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| 27 | #include "pppcielanes.h" |
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| 28 | |
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| 29 | /** \file |
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| 30 | * Functions related to PCIe lane changes. |
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| 31 | */ |
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| 32 | |
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| 33 | /* For converting from number of lanes to lane bits. */ |
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| 34 | static const unsigned char pp_r600_encode_lanes[] = { |
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| 35 | 0, /* 0 Not Supported */ |
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| 36 | 1, /* 1 Lane */ |
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| 37 | 2, /* 2 Lanes */ |
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| 38 | 0, /* 3 Not Supported */ |
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| 39 | 3, /* 4 Lanes */ |
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| 40 | 0, /* 5 Not Supported */ |
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| 41 | 0, /* 6 Not Supported */ |
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| 42 | 0, /* 7 Not Supported */ |
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| 43 | 4, /* 8 Lanes */ |
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| 44 | 0, /* 9 Not Supported */ |
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| 45 | 0, /* 10 Not Supported */ |
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| 46 | 0, /* 11 Not Supported */ |
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| 47 | 5, /* 12 Lanes (Not actually supported) */ |
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| 48 | 0, /* 13 Not Supported */ |
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| 49 | 0, /* 14 Not Supported */ |
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| 50 | 0, /* 15 Not Supported */ |
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| 51 | 6 /* 16 Lanes */ |
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| 52 | }; |
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| 53 | |
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| 54 | static const unsigned char pp_r600_decoded_lanes[8] = { 16, 1, 2, 4, 8, 12, 16, }; |
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| 55 | |
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| 56 | uint8_t encode_pcie_lane_width(uint32_t num_lanes) |
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| 57 | { |
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| 58 | return pp_r600_encode_lanes[num_lanes]; |
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| 59 | } |
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| 60 | |
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| 61 | uint8_t decode_pcie_lane_width(uint32_t num_lanes) |
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| 62 | { |
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| 63 | return pp_r600_decoded_lanes[num_lanes]; |
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| 64 | } |
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| 65 | |
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