Line data    Source code

       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           0 : uint8_t encode_pcie_lane_width(uint32_t num_lanes)
      57             : {
      58           0 :         return pp_r600_encode_lanes[num_lanes];
      59             : }
      60             : 
      61           0 : uint8_t decode_pcie_lane_width(uint32_t num_lanes)
      62             : {
      63           0 :         return pp_r600_decoded_lanes[num_lanes];
      64             : }