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      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 
     61 uint8_t encode_pcie_lane_width(uint32_t num_lanes)
     62 {
     63 	return pp_r600_encode_lanes[num_lanes];
     64 }
     65 
     66 uint8_t decode_pcie_lane_width(uint32_t num_lanes)
     67 {
     68 	return pp_r600_decoded_lanes[num_lanes];
     69 }
     70