drivers/net/ethernet/mellanox/mlx5/core/fpga/sdk.c

   1 /*
   2  * Copyright (c) 2017 Mellanox Technologies. All rights reserved.
   3  *
   4  * This software is available to you under a choice of one of two
   5  * licenses.  You may choose to be licensed under the terms of the GNU
   6  * General Public License (GPL) Version 2, available from the file
   7  * COPYING in the main directory of this source tree, or the
   8  * OpenIB.org BSD license below:
   9  *
  10  *     Redistribution and use in source and binary forms, with or
  11  *     without modification, are permitted provided that the following
  12  *     conditions are met:
  13  *
  14  *      - Redistributions of source code must retain the above
  15  *        copyright notice, this list of conditions and the following
  16  *        disclaimer.
  17  *
  18  *      - Redistributions in binary form must reproduce the above
  19  *        copyright notice, this list of conditions and the following
  20  *        disclaimer in the documentation and/or other materials
  21  *        provided with the distribution.
  22  *
  23  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  24  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  25  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  26  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
  27  * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
  28  * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  29  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  30  * SOFTWARE.
  31  *
  32  */
  33
  34 #include <linux/mlx5/device.h>
  35
  36 #include "fpga/core.h"
  37 #include "fpga/conn.h"
  38 #include "fpga/sdk.h"
  39
  40 struct mlx5_fpga_conn *
  41 mlx5_fpga_sbu_conn_create(struct mlx5_fpga_device *fdev,
  42                           struct mlx5_fpga_conn_attr *attr)
  43 {
  44         return mlx5_fpga_conn_create(fdev, attr, MLX5_FPGA_QPC_QP_TYPE_SANDBOX_QP);
  45 }
  46 EXPORT_SYMBOL(mlx5_fpga_sbu_conn_create);
  47
  48 void mlx5_fpga_sbu_conn_destroy(struct mlx5_fpga_conn *conn)
  49 {
  50         mlx5_fpga_conn_destroy(conn);
  51 }
  52 EXPORT_SYMBOL(mlx5_fpga_sbu_conn_destroy);
  53
  54 int mlx5_fpga_sbu_conn_sendmsg(struct mlx5_fpga_conn *conn,
  55                                struct mlx5_fpga_dma_buf *buf)
  56 {
  57         return mlx5_fpga_conn_send(conn, buf);
  58 }
  59 EXPORT_SYMBOL(mlx5_fpga_sbu_conn_sendmsg);
  60
  61 static int mlx5_fpga_mem_read_i2c(struct mlx5_fpga_device *fdev, size_t size,
  62                                   u64 addr, u8 *buf)
  63 {
  64         size_t max_size = MLX5_FPGA_ACCESS_REG_SIZE_MAX;
  65         size_t bytes_done = 0;
  66         u8 actual_size;
  67         int err;
  68
  69         if (!fdev->mdev)
  70                 return -ENOTCONN;
  71
  72         while (bytes_done < size) {
  73                 actual_size = min(max_size, (size - bytes_done));
  74
  75                 err = mlx5_fpga_access_reg(fdev->mdev, actual_size,
  76                                            addr + bytes_done,
  77                                            buf + bytes_done, false);
  78                 if (err) {
  79                         mlx5_fpga_err(fdev, "Failed to read over I2C: %d\n",
  80                                       err);
  81                         break;
  82                 }
  83
  84                 bytes_done += actual_size;
  85         }
  86
  87         return err;
  88 }
  89
  90 static int mlx5_fpga_mem_write_i2c(struct mlx5_fpga_device *fdev, size_t size,
  91                                    u64 addr, u8 *buf)
  92 {
  93         size_t max_size = MLX5_FPGA_ACCESS_REG_SIZE_MAX;
  94         size_t bytes_done = 0;
  95         u8 actual_size;
  96         int err;
  97
  98         if (!fdev->mdev)
  99                 return -ENOTCONN;
 100
 101         while (bytes_done < size) {
 102                 actual_size = min(max_size, (size - bytes_done));
 103
 104                 err = mlx5_fpga_access_reg(fdev->mdev, actual_size,
 105                                            addr + bytes_done,
 106                                            buf + bytes_done, true);
 107                 if (err) {
 108                         mlx5_fpga_err(fdev, "Failed to write FPGA crspace\n");
 109                         break;
 110                 }
 111
 112                 bytes_done += actual_size;
 113         }
 114
 115         return err;
 116 }
 117
 118 int mlx5_fpga_mem_read(struct mlx5_fpga_device *fdev, size_t size, u64 addr,
 119                        void *buf, enum mlx5_fpga_access_type access_type)
 120 {
 121         int ret;
 122
 123         switch (access_type) {
 124         case MLX5_FPGA_ACCESS_TYPE_I2C:
 125                 ret = mlx5_fpga_mem_read_i2c(fdev, size, addr, buf);
 126                 if (ret)
 127                         return ret;
 128                 break;
 129         default:
 130                 mlx5_fpga_warn(fdev, "Unexpected read access_type %u\n",
 131                                access_type);
 132                 return -EACCES;
 133         }
 134
 135         return size;
 136 }
 137 EXPORT_SYMBOL(mlx5_fpga_mem_read);
 138
 139 int mlx5_fpga_mem_write(struct mlx5_fpga_device *fdev, size_t size, u64 addr,
 140                         void *buf, enum mlx5_fpga_access_type access_type)
 141 {
 142         int ret;
 143
 144         switch (access_type) {
 145         case MLX5_FPGA_ACCESS_TYPE_I2C:
 146                 ret = mlx5_fpga_mem_write_i2c(fdev, size, addr, buf);
 147                 if (ret)
 148                         return ret;
 149                 break;
 150         default:
 151                 mlx5_fpga_warn(fdev, "Unexpected write access_type %u\n",
 152                                access_type);
 153                 return -EACCES;
 154         }
 155
 156         return size;
 157 }
 158 EXPORT_SYMBOL(mlx5_fpga_mem_write);
 159
 160 int mlx5_fpga_get_sbu_caps(struct mlx5_fpga_device *fdev, int size, void *buf)
 161 {
 162         return mlx5_fpga_sbu_caps(fdev->mdev, buf, size);
 163 }
 164 EXPORT_SYMBOL(mlx5_fpga_get_sbu_caps);