/******************************************************************************
 *
 * This file is provided under a dual BSD/GPLv2 license.  When using or
 * redistributing this file, you may do so under either license.
 *
 * GPL LICENSE SUMMARY
 *
 * Copyright(c) 2012 - 2014 Intel Corporation. All rights reserved.
 * Copyright(c) 2013 - 2014 Intel Mobile Communications GmbH
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of version 2 of the GNU General Public License as
 * published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110,
 * USA
 *
 * The full GNU General Public License is included in this distribution
 * in the file called COPYING.
 *
 * Contact Information:
 *  Intel Linux Wireless <linuxwifi@intel.com>
 * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
 *
 * BSD LICENSE
 *
 * Copyright(c) 2012 - 2014 Intel Corporation. All rights reserved.
 * Copyright(c) 2013 - 2014 Intel Mobile Communications GmbH
 * All rights reserved.
 *
 * 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.
 *  * Neither the name Intel Corporation nor the names of its
 *    contributors may be used to endorse or promote products derived
 *    from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 *****************************************************************************/

#include <net/mac80211.h>
#include "fw-api.h"
#include "mvm.h"

/* Maps the driver specific channel width definition to the fw values */
u8 iwl_mvm_get_channel_width(struct cfg80211_chan_def *chandef)
{
        switch (chandef->width) {
        case NL80211_CHAN_WIDTH_20_NOHT:
        case NL80211_CHAN_WIDTH_20:
                return PHY_VHT_CHANNEL_MODE20;
        case NL80211_CHAN_WIDTH_40:
                return PHY_VHT_CHANNEL_MODE40;
        case NL80211_CHAN_WIDTH_80:
                return PHY_VHT_CHANNEL_MODE80;
        case NL80211_CHAN_WIDTH_160:
                return PHY_VHT_CHANNEL_MODE160;
        default:
                WARN(1, "Invalid channel width=%u", chandef->width);
                return PHY_VHT_CHANNEL_MODE20;
        }
}

/*
 * Maps the driver specific control channel position (relative to the center
 * freq) definitions to the the fw values
 */
u8 iwl_mvm_get_ctrl_pos(struct cfg80211_chan_def *chandef)
{
        switch (chandef->chan->center_freq - chandef->center_freq1) {
        case -70:
                return PHY_VHT_CTRL_POS_4_BELOW;
        case -50:
                return PHY_VHT_CTRL_POS_3_BELOW;
        case -30:
                return PHY_VHT_CTRL_POS_2_BELOW;
        case -10:
                return PHY_VHT_CTRL_POS_1_BELOW;
        case  10:
                return PHY_VHT_CTRL_POS_1_ABOVE;
        case  30:
                return PHY_VHT_CTRL_POS_2_ABOVE;
        case  50:
                return PHY_VHT_CTRL_POS_3_ABOVE;
        case  70:
                return PHY_VHT_CTRL_POS_4_ABOVE;
        default:
                WARN(1, "Invalid channel definition");
        case 0:
                /*
                 * The FW is expected to check the control channel position only
                 * when in HT/VHT and the channel width is not 20MHz. Return
                 * this value as the default one.
                 */
                return PHY_VHT_CTRL_POS_1_BELOW;
        }
}

/*
 * Construct the generic fields of the PHY context command
 */
static void iwl_mvm_phy_ctxt_cmd_hdr(struct iwl_mvm_phy_ctxt *ctxt,
                                     struct iwl_phy_context_cmd *cmd,
                                     u32 action, u32 apply_time)
{
        memset(cmd, 0, sizeof(struct iwl_phy_context_cmd));

        cmd->id_and_color = cpu_to_le32(FW_CMD_ID_AND_COLOR(ctxt->id,
                                                            ctxt->color));
        cmd->action = cpu_to_le32(action);
        cmd->apply_time = cpu_to_le32(apply_time);
}

/*
 * Add the phy configuration to the PHY context command
 */
static void iwl_mvm_phy_ctxt_cmd_data(struct iwl_mvm *mvm,
                                      struct iwl_phy_context_cmd *cmd,
                                      struct cfg80211_chan_def *chandef,
                                      u8 chains_static, u8 chains_dynamic)
{
        u8 active_cnt, idle_cnt;

        /* Set the channel info data */
        cmd->ci.band = (chandef->chan->band == IEEE80211_BAND_2GHZ ?
              PHY_BAND_24 : PHY_BAND_5);

        cmd->ci.channel = chandef->chan->hw_value;
        cmd->ci.width = iwl_mvm_get_channel_width(chandef);
        cmd->ci.ctrl_pos = iwl_mvm_get_ctrl_pos(chandef);

        /* Set rx the chains */
        idle_cnt = chains_static;
        active_cnt = chains_dynamic;

        /* In scenarios where we only ever use a single-stream rates,
         * i.e. legacy 11b/g/a associations, single-stream APs or even
         * static SMPS, enable both chains to get diversity, improving
         * the case where we're far enough from the AP that attenuation
         * between the two antennas is sufficiently different to impact
         * performance.
         */
        if (active_cnt == 1 && iwl_mvm_rx_diversity_allowed(mvm)) {
                idle_cnt = 2;
                active_cnt = 2;
        }

        cmd->rxchain_info = cpu_to_le32(iwl_mvm_get_valid_rx_ant(mvm) <<
                                        PHY_RX_CHAIN_VALID_POS);
        cmd->rxchain_info |= cpu_to_le32(idle_cnt << PHY_RX_CHAIN_CNT_POS);
        cmd->rxchain_info |= cpu_to_le32(active_cnt <<
                                         PHY_RX_CHAIN_MIMO_CNT_POS);
#ifdef CONFIG_IWLWIFI_DEBUGFS
        if (unlikely(mvm->dbgfs_rx_phyinfo))
                cmd->rxchain_info = cpu_to_le32(mvm->dbgfs_rx_phyinfo);
#endif

        cmd->txchain_info = cpu_to_le32(iwl_mvm_get_valid_tx_ant(mvm));
}

/*
 * Send a command to apply the current phy configuration. The command is send
 * only if something in the configuration changed: in case that this is the
 * first time that the phy configuration is applied or in case that the phy
 * configuration changed from the previous apply.
 */
static int iwl_mvm_phy_ctxt_apply(struct iwl_mvm *mvm,
                                  struct iwl_mvm_phy_ctxt *ctxt,
                                  struct cfg80211_chan_def *chandef,
                                  u8 chains_static, u8 chains_dynamic,
                                  u32 action, u32 apply_time)
{
        struct iwl_phy_context_cmd cmd;
        int ret;

        /* Set the command header fields */
        iwl_mvm_phy_ctxt_cmd_hdr(ctxt, &cmd, action, apply_time);

        /* Set the command data */
        iwl_mvm_phy_ctxt_cmd_data(mvm, &cmd, chandef,
                                  chains_static, chains_dynamic);

        ret = iwl_mvm_send_cmd_pdu(mvm, PHY_CONTEXT_CMD, 0,
                                   sizeof(struct iwl_phy_context_cmd),
                                   &cmd);
        if (ret)
                IWL_ERR(mvm, "PHY ctxt cmd error. ret=%d\n", ret);
        return ret;
}

/*
 * Send a command to add a PHY context based on the current HW configuration.
 */
int iwl_mvm_phy_ctxt_add(struct iwl_mvm *mvm, struct iwl_mvm_phy_ctxt *ctxt,
                         struct cfg80211_chan_def *chandef,
                         u8 chains_static, u8 chains_dynamic)
{
        WARN_ON(!test_bit(IWL_MVM_STATUS_IN_HW_RESTART, &mvm->status) &&
                ctxt->ref);
        lockdep_assert_held(&mvm->mutex);

        ctxt->channel = chandef->chan;

        return iwl_mvm_phy_ctxt_apply(mvm, ctxt, chandef,
                                      chains_static, chains_dynamic,
                                      FW_CTXT_ACTION_ADD, 0);
}

/*
 * Update the number of references to the given PHY context. This is valid only
 * in case the PHY context was already created, i.e., its reference count > 0.
 */
void iwl_mvm_phy_ctxt_ref(struct iwl_mvm *mvm, struct iwl_mvm_phy_ctxt *ctxt)
{
        lockdep_assert_held(&mvm->mutex);
        ctxt->ref++;
}

/*
 * Send a command to modify the PHY context based on the current HW
 * configuration. Note that the function does not check that the configuration
 * changed.
 */
int iwl_mvm_phy_ctxt_changed(struct iwl_mvm *mvm, struct iwl_mvm_phy_ctxt *ctxt,
                             struct cfg80211_chan_def *chandef,
                             u8 chains_static, u8 chains_dynamic)
{
        lockdep_assert_held(&mvm->mutex);

        ctxt->channel = chandef->chan;
        return iwl_mvm_phy_ctxt_apply(mvm, ctxt, chandef,
                                      chains_static, chains_dynamic,
                                      FW_CTXT_ACTION_MODIFY, 0);
}

void iwl_mvm_phy_ctxt_unref(struct iwl_mvm *mvm, struct iwl_mvm_phy_ctxt *ctxt)
{
        lockdep_assert_held(&mvm->mutex);

        if (WARN_ON_ONCE(!ctxt))
                return;

        ctxt->ref--;
}

static void iwl_mvm_binding_iterator(void *_data, u8 *mac,
                                     struct ieee80211_vif *vif)
{
        unsigned long *data = _data;
        struct iwl_mvm_vif *mvmvif = iwl_mvm_vif_from_mac80211(vif);

        if (!mvmvif->phy_ctxt)
                return;

        if (vif->type == NL80211_IFTYPE_STATION ||
            vif->type == NL80211_IFTYPE_AP)
                __set_bit(mvmvif->phy_ctxt->id, data);
}

int iwl_mvm_phy_ctx_count(struct iwl_mvm *mvm)
{
        unsigned long phy_ctxt_counter = 0;

        ieee80211_iterate_active_interfaces_atomic(mvm->hw,
                                                   IEEE80211_IFACE_ITER_NORMAL,
                                                   iwl_mvm_binding_iterator,
                                                   &phy_ctxt_counter);

        return hweight8(phy_ctxt_counter);
}