/*
 * Copyright (c) 2007 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/errno.h>
#include <linux/if_ether.h>

#include <linux/mlx4/cmd.h>

#include "mlx4.h"

int mlx4_SENSE_PORT(struct mlx4_dev *dev, int port,
                    enum mlx4_port_type *type)
{
        u64 out_param;
        int err = 0;

        err = mlx4_cmd_imm(dev, 0, &out_param, port, 0,
                           MLX4_CMD_SENSE_PORT, MLX4_CMD_TIME_CLASS_B,
                           MLX4_CMD_WRAPPED);
        if (err) {
                mlx4_err(dev, "Sense command failed for port: %d\n", port);
                return err;
        }

        if (out_param > 2) {
                mlx4_err(dev, "Sense returned illegal value: 0x%llx\n", out_param);
                return -EINVAL;
        }

        *type = out_param;
        return 0;
}

void mlx4_do_sense_ports(struct mlx4_dev *dev,
                         enum mlx4_port_type *stype,
                         enum mlx4_port_type *defaults)
{
        struct mlx4_sense *sense = &mlx4_priv(dev)->sense;
        int err;
        int i;

        for (i = 1; i <= dev->caps.num_ports; i++) {
                stype[i - 1] = 0;
                if (sense->do_sense_port[i] && sense->sense_allowed[i] &&
                    dev->caps.possible_type[i] == MLX4_PORT_TYPE_AUTO) {
                        err = mlx4_SENSE_PORT(dev, i, &stype[i - 1]);
                        if (err)
                                stype[i - 1] = defaults[i - 1];
                } else
                        stype[i - 1] = defaults[i - 1];
        }

        /*
         * If sensed nothing, remain in current configuration.
         */
        for (i = 0; i < dev->caps.num_ports; i++)
                stype[i] = stype[i] ? stype[i] : defaults[i];

}

static void mlx4_sense_port(struct work_struct *work)
{
        struct delayed_work *delay = to_delayed_work(work);
        struct mlx4_sense *sense = container_of(delay, struct mlx4_sense,
                                                sense_poll);
        struct mlx4_dev *dev = sense->dev;
        struct mlx4_priv *priv = mlx4_priv(dev);
        enum mlx4_port_type stype[MLX4_MAX_PORTS];

        mutex_lock(&priv->port_mutex);
        mlx4_do_sense_ports(dev, stype, &dev->caps.port_type[1]);

        if (mlx4_check_port_params(dev, stype))
                goto sense_again;

        if (mlx4_change_port_types(dev, stype))
                mlx4_err(dev, "Failed to change port_types\n");

sense_again:
        mutex_unlock(&priv->port_mutex);
        queue_delayed_work(mlx4_wq , &sense->sense_poll,
                           round_jiffies_relative(MLX4_SENSE_RANGE));
}

void mlx4_start_sense(struct mlx4_dev *dev)
{
        struct mlx4_priv *priv = mlx4_priv(dev);
        struct mlx4_sense *sense = &priv->sense;

        if (!(dev->caps.flags & MLX4_DEV_CAP_FLAG_DPDP))
                return;

        queue_delayed_work(mlx4_wq , &sense->sense_poll,
                           round_jiffies_relative(MLX4_SENSE_RANGE));
}

void mlx4_stop_sense(struct mlx4_dev *dev)
{
        cancel_delayed_work_sync(&mlx4_priv(dev)->sense.sense_poll);
}

void  mlx4_sense_init(struct mlx4_dev *dev)
{
        struct mlx4_priv *priv = mlx4_priv(dev);
        struct mlx4_sense *sense = &priv->sense;
        int port;

        sense->dev = dev;
        for (port = 1; port <= dev->caps.num_ports; port++)
                sense->do_sense_port[port] = 1;

        INIT_DEFERRABLE_WORK(&sense->sense_poll, mlx4_sense_port);
}