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

/*
 * Copyright (c) 2017 Mellanox Technologies. All rights reserved.
 *
 * This software is available to you under a choice of one of two
 * licenses.  You may choose to be licensed under the terms of the GNU
 * General Public License (GPL) Version 2, available from the file
 * COPYING in the main directory of this source tree, or the
 * OpenIB.org BSD license below:
 *
 *     Redistribution and use in source and binary forms, with or
 *     without modification, are permitted provided that the following
 *     conditions are met:
 *
 *      - Redistributions of source code must retain the above
 *        copyright notice, this list of conditions and the following
 *        disclaimer.
 *
 *      - Redistributions in binary form must reproduce the above
 *        copyright notice, this list of conditions and the following
 *        disclaimer in the documentation and/or other materials
 *        provided with the distribution.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 *
 */

#include <linux/mlx5/device.h>

#include "fpga/core.h"
#include "fpga/conn.h"
#include "fpga/sdk.h"

struct mlx5_fpga_conn *
mlx5_fpga_sbu_conn_create(struct mlx5_fpga_device *fdev,
			  struct mlx5_fpga_conn_attr *attr)
{
	return mlx5_fpga_conn_create(fdev, attr, MLX5_FPGA_QPC_QP_TYPE_SANDBOX_QP);
}
EXPORT_SYMBOL(mlx5_fpga_sbu_conn_create);

void mlx5_fpga_sbu_conn_destroy(struct mlx5_fpga_conn *conn)
{
	mlx5_fpga_conn_destroy(conn);
}
EXPORT_SYMBOL(mlx5_fpga_sbu_conn_destroy);

int mlx5_fpga_sbu_conn_sendmsg(struct mlx5_fpga_conn *conn,
			       struct mlx5_fpga_dma_buf *buf)
{
	return mlx5_fpga_conn_send(conn, buf);
}
EXPORT_SYMBOL(mlx5_fpga_sbu_conn_sendmsg);

static int mlx5_fpga_mem_read_i2c(struct mlx5_fpga_device *fdev, size_t size,
				  u64 addr, u8 *buf)
{
	size_t max_size = MLX5_FPGA_ACCESS_REG_SIZE_MAX;
	size_t bytes_done = 0;
	u8 actual_size;
	int err;

	if (!size)
		return -EINVAL;

	if (!fdev->mdev)
		return -ENOTCONN;

	while (bytes_done < size) {
		actual_size = min(max_size, (size - bytes_done));

		err = mlx5_fpga_access_reg(fdev->mdev, actual_size,
					   addr + bytes_done,
					   buf + bytes_done, false);
		if (err) {
			mlx5_fpga_err(fdev, "Failed to read over I2C: %d\n",
				      err);
			break;
		}

		bytes_done += actual_size;
	}

	return err;
}

static int mlx5_fpga_mem_write_i2c(struct mlx5_fpga_device *fdev, size_t size,
				   u64 addr, u8 *buf)
{
	size_t max_size = MLX5_FPGA_ACCESS_REG_SIZE_MAX;
	size_t bytes_done = 0;
	u8 actual_size;
	int err;

	if (!size)
		return -EINVAL;

	if (!fdev->mdev)
		return -ENOTCONN;

	while (bytes_done < size) {
		actual_size = min(max_size, (size - bytes_done));

		err = mlx5_fpga_access_reg(fdev->mdev, actual_size,
					   addr + bytes_done,
					   buf + bytes_done, true);
		if (err) {
			mlx5_fpga_err(fdev, "Failed to write FPGA crspace\n");
			break;
		}

		bytes_done += actual_size;
	}

	return err;
}

int mlx5_fpga_mem_read(struct mlx5_fpga_device *fdev, size_t size, u64 addr,
		       void *buf, enum mlx5_fpga_access_type access_type)
{
	int ret;

	switch (access_type) {
	case MLX5_FPGA_ACCESS_TYPE_I2C:
		ret = mlx5_fpga_mem_read_i2c(fdev, size, addr, buf);
		if (ret)
			return ret;
		break;
	default:
		mlx5_fpga_warn(fdev, "Unexpected read access_type %u\n",
			       access_type);
		return -EACCES;
	}

	return size;
}
EXPORT_SYMBOL(mlx5_fpga_mem_read);

int mlx5_fpga_mem_write(struct mlx5_fpga_device *fdev, size_t size, u64 addr,
			void *buf, enum mlx5_fpga_access_type access_type)
{
	int ret;

	switch (access_type) {
	case MLX5_FPGA_ACCESS_TYPE_I2C:
		ret = mlx5_fpga_mem_write_i2c(fdev, size, addr, buf);
		if (ret)
			return ret;
		break;
	default:
		mlx5_fpga_warn(fdev, "Unexpected write access_type %u\n",
			       access_type);
		return -EACCES;
	}

	return size;
}
EXPORT_SYMBOL(mlx5_fpga_mem_write);

int mlx5_fpga_get_sbu_caps(struct mlx5_fpga_device *fdev, int size, void *buf)
{
	return mlx5_fpga_sbu_caps(fdev->mdev, buf, size);
}
EXPORT_SYMBOL(mlx5_fpga_get_sbu_caps);