iwlwifi: add the MVM driver

Newer firmware revisions have a completely new
firmware API. This is the new driver for this
new API.

I've listed the people who directly contributed
code, but many others from various teams have
contributed in other ways.

Cc: Alexander Bondar <alexander.bondar@intel.com>
Cc: Amit Beka <amit.beka@intel.com>
Cc: Amnon Paz <amnonx.paz@intel.com>
Cc: Assaf Krauss <assaf.krauss@intel.com>
Cc: David Spinadel <david.spinadel@intel.com>
Cc: Dor Shaish <dor.shaish@intel.com>
Cc: Emmanuel Grumbach <emmanuel.grumbach@intel.com>
Cc: Eytan Lifshitz <eytan.lifshitz@intel.com>
Cc: Ilan Peer <ilan.peer@intel.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

1 files changed, 292 insertions, 0 deletions

diff --git a/drivers/net/wireless/iwlwifi/mvm/phy-ctxt.c b/drivers/net/wireless/iwlwifi/mvm/phy-ctxt.c
new file mode 100644
index 000000000000..b428448f8ddf
--- /dev/null
+++ b/drivers/net/wireless/iwlwifi/mvm/phy-ctxt.c
@@ -0,0 +1,292 @@
+/******************************************************************************
+ *
+ * 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 - 2013 Intel Corporation. All rights reserved.
+ *
+ * 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 LICENSE.GPL.
+ *
+ * Contact Information:
+ *  Intel Linux Wireless <ilw@linux.intel.com>
+ * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
+ *
+ * BSD LICENSE
+ *
+ * Copyright(c) 2012 - 2013 Intel Corporation. All rights reserved.
+ * 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 the fw values */
+static inline 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
+ */
+static inline 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 valid_rx_chains, 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 */
+
+	/* TODO:
+	 * Need to add on chain noise calibration limitations, and
+	 * BT coex considerations.
+	 */
+	valid_rx_chains = mvm->nvm_data->valid_rx_ant;
+	idle_cnt = chains_static;
+	active_cnt = chains_dynamic;
+
+	cmd->rxchain_info = cpu_to_le32(valid_rx_chains <<
+					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);
+
+	cmd->txchain_info = cpu_to_le32(mvm->nvm_data->valid_tx_ant);
+}
+
+/*
+ * 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, CMD_SYNC,
+				   sizeof(struct iwl_phy_context_cmd),
+				   &cmd);
+	if (ret)
+		IWL_ERR(mvm, "PHY ctxt cmd error. ret=%d\n", ret);
+	return ret;
+}
+
+
+struct phy_ctx_used_data {
+	unsigned long used[BITS_TO_LONGS(NUM_PHY_CTX)];
+};
+
+static void iwl_mvm_phy_ctx_used_iter(struct ieee80211_hw *hw,
+				      struct ieee80211_chanctx_conf *ctx,
+				      void *_data)
+{
+	struct phy_ctx_used_data *data = _data;
+	struct iwl_mvm_phy_ctxt *phy_ctxt = (void *)ctx->drv_priv;
+
+	__set_bit(phy_ctxt->id, data->used);
+}
+
+/*
+ * 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)
+{
+	struct phy_ctx_used_data data = {
+		.used = { },
+	};
+
+	/*
+	 * If this is a regular PHY context (not the ROC one)
+	 * skip the ROC PHY context's ID.
+	 */
+	if (ctxt != &mvm->phy_ctxt_roc)
+		__set_bit(mvm->phy_ctxt_roc.id, data.used);
+
+	lockdep_assert_held(&mvm->mutex);
+	ctxt->color++;
+
+	if (!test_bit(IWL_MVM_STATUS_IN_HW_RESTART, &mvm->status)) {
+		ieee80211_iter_chan_contexts_atomic(
+			mvm->hw, iwl_mvm_phy_ctx_used_iter, &data);
+
+		ctxt->id = find_first_zero_bit(data.used, NUM_PHY_CTX);
+		if (WARN_ONCE(ctxt->id == NUM_PHY_CTX,
+			      "Failed to init PHY context - no free ID!\n"))
+			return -EIO;
+	}
+
+	ctxt->channel = chandef->chan;
+	return iwl_mvm_phy_ctxt_apply(mvm, ctxt, chandef,
+				      chains_static, chains_dynamic,
+				      FW_CTXT_ACTION_ADD, 0);
+}
+
+/*
+ * 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);
+}
+
+/*
+ * Send a command to the FW to remove the given phy context.
+ * Once the command is sent, regardless of success or failure, the context is
+ * marked as invalid
+ */
+void iwl_mvm_phy_ctxt_remove(struct iwl_mvm *mvm, struct iwl_mvm_phy_ctxt *ctxt)
+{
+	struct iwl_phy_context_cmd cmd;
+	int ret;
+
+	lockdep_assert_held(&mvm->mutex);
+
+	iwl_mvm_phy_ctxt_cmd_hdr(ctxt, &cmd, FW_CTXT_ACTION_REMOVE, 0);
+	ret = iwl_mvm_send_cmd_pdu(mvm, PHY_CONTEXT_CMD, CMD_SYNC,
+				   sizeof(struct iwl_phy_context_cmd),
+				   &cmd);
+	if (ret)
+		IWL_ERR(mvm, "Failed to send PHY remove: ctxt id=%d\n",
+			ctxt->id);
+}