wireless: mwifiex: initial commit for Marvell mwifiex driver

This driver adds WiFi support for Marvell 802.11n based chipsets
with SDIO interface. Currently only SD8787 is supported. More
chipsets will be supported later.

drivers/net/wireless/mwifiex/

Signed-off-by: Nishant Sarmukadam <nishants@marvell.com>
Signed-off-by: Amitkumar Karwar <akarwar@marvell.com>
Signed-off-by: Kiran Divekar <dkiran@marvell.com>
Signed-off-by: Bing Zhao <bzhao@marvell.com>
Signed-off-by: Yogesh Ashok Powar <yogeshp@marvell.com>
Signed-off-by: Marc Yang <yangyang@marvell.com>
Signed-off-by: Ramesh Radhakrishnan <rramesh@marvell.com>
Signed-off-by: Frank Huang <frankh@marvell.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

1 files changed, 202 insertions, 0 deletions

diff --git a/drivers/net/wireless/mwifiex/txrx.c b/drivers/net/wireless/mwifiex/txrx.c
new file mode 100644
index 00000000000..f06923cb1c4
--- /dev/null
+++ b/drivers/net/wireless/mwifiex/txrx.c
@@ -0,0 +1,202 @@
+/*
+ * Marvell Wireless LAN device driver: generic TX/RX data handling
+ *
+ * Copyright (C) 2011, Marvell International Ltd.
+ *
+ * This software file (the "File") is distributed by Marvell International
+ * Ltd. under the terms of the GNU General Public License Version 2, June 1991
+ * (the "License").  You may use, redistribute and/or modify this File in
+ * accordance with the terms and conditions of the License, a copy of which
+ * is available by writing to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA or on the
+ * worldwide web at http://www.gnu.org/licenses/old-licenses/gpl-2.0.txt.
+ *
+ * THE FILE IS DISTRIBUTED AS-IS, WITHOUT WARRANTY OF ANY KIND, AND THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE
+ * ARE EXPRESSLY DISCLAIMED.  The License provides additional details about
+ * this warranty disclaimer.
+ */
+
+#include "decl.h"
+#include "ioctl.h"
+#include "util.h"
+#include "fw.h"
+#include "main.h"
+#include "wmm.h"
+
+/*
+ * This function processes the received buffer.
+ *
+ * Main responsibility of this function is to parse the RxPD to
+ * identify the correct interface this packet is headed for and
+ * forwarding it to the associated handling function, where the
+ * packet will be further processed and sent to kernel/upper layer
+ * if required.
+ */
+int mwifiex_handle_rx_packet(struct mwifiex_adapter *adapter,
+			     struct sk_buff *skb)
+{
+	int ret = 0;
+	struct mwifiex_private *priv =
+		mwifiex_get_priv(adapter, MWIFIEX_BSS_ROLE_ANY);
+	struct rxpd *local_rx_pd;
+	struct mwifiex_rxinfo *rx_info = MWIFIEX_SKB_RXCB(skb);
+
+	local_rx_pd = (struct rxpd *) (skb->data);
+	/* Get the BSS number from rxpd, get corresponding priv */
+	priv = mwifiex_get_priv_by_id(adapter, local_rx_pd->bss_num &
+				      BSS_NUM_MASK, local_rx_pd->bss_type);
+	if (!priv)
+		priv = mwifiex_get_priv(adapter, MWIFIEX_BSS_ROLE_ANY);
+
+	rx_info->bss_index = priv->bss_index;
+	ret = mwifiex_process_sta_rx_packet(adapter, skb);
+
+	return ret;
+}
+EXPORT_SYMBOL_GPL(mwifiex_handle_rx_packet);
+
+/*
+ * This function sends a packet to device.
+ *
+ * It processes the packet to add the TxPD, checks condition and
+ * sends the processed packet to firmware for transmission.
+ *
+ * On successful completion, the function calls the completion callback
+ * and logs the time.
+ */
+int mwifiex_process_tx(struct mwifiex_private *priv, struct sk_buff *skb,
+		       struct mwifiex_tx_param *tx_param)
+{
+	int ret = -1;
+	struct mwifiex_adapter *adapter = priv->adapter;
+	u8 *head_ptr = NULL;
+	struct txpd *local_tx_pd = NULL;
+
+	head_ptr = (u8 *) mwifiex_process_sta_txpd(priv, skb);
+	if (head_ptr) {
+		if (GET_BSS_ROLE(priv) == MWIFIEX_BSS_ROLE_STA)
+			local_tx_pd =
+				(struct txpd *) (head_ptr + INTF_HEADER_LEN);
+
+		ret = adapter->if_ops.host_to_card(adapter, MWIFIEX_TYPE_DATA,
+					     skb->data, skb->len, tx_param);
+	}
+
+	switch (ret) {
+	case -EBUSY:
+		if ((GET_BSS_ROLE(priv) == MWIFIEX_BSS_ROLE_STA) &&
+			(adapter->pps_uapsd_mode) &&
+			(adapter->tx_lock_flag)) {
+				priv->adapter->tx_lock_flag = false;
+				local_tx_pd->flags = 0;
+		}
+		dev_dbg(adapter->dev, "data: -EBUSY is returned\n");
+		break;
+	case -1:
+		adapter->data_sent = false;
+		dev_err(adapter->dev, "mwifiex_write_data_async failed: 0x%X\n",
+		       ret);
+		adapter->dbg.num_tx_host_to_card_failure++;
+		mwifiex_write_data_complete(adapter, skb, ret);
+		break;
+	case -EINPROGRESS:
+		adapter->data_sent = false;
+		break;
+	case 0:
+		mwifiex_write_data_complete(adapter, skb, ret);
+		break;
+	default:
+		break;
+	}
+
+	return ret;
+}
+
+/*
+ * Packet send completion callback handler.
+ *
+ * It either frees the buffer directly or forwards it to another
+ * completion callback which checks conditions, updates statistics,
+ * wakes up stalled traffic queue if required, and then frees the buffer.
+ */
+int mwifiex_write_data_complete(struct mwifiex_adapter *adapter,
+				struct sk_buff *skb, int status)
+{
+	struct mwifiex_private *priv = NULL, *tpriv = NULL;
+	struct mwifiex_txinfo *tx_info = NULL;
+	int i;
+
+	if (!skb)
+		return 0;
+
+	tx_info = MWIFIEX_SKB_TXCB(skb);
+	priv = mwifiex_bss_index_to_priv(adapter, tx_info->bss_index);
+	if (!priv)
+		goto done;
+
+	priv->netdev->trans_start = jiffies;
+	if (!status) {
+		priv->stats.tx_packets++;
+		priv->stats.tx_bytes += skb->len;
+	} else {
+		priv->stats.tx_errors++;
+	}
+	atomic_dec(&adapter->tx_pending);
+
+	for (i = 0; i < adapter->priv_num; i++) {
+
+		tpriv = adapter->priv[i];
+
+		if ((GET_BSS_ROLE(tpriv) == MWIFIEX_BSS_ROLE_STA)
+				&& (tpriv->media_connected)) {
+			if (netif_queue_stopped(tpriv->netdev))
+				netif_wake_queue(tpriv->netdev);
+		}
+	}
+done:
+	dev_kfree_skb_any(skb);
+
+	return 0;
+}
+
+/*
+ * Packet receive completion callback handler.
+ *
+ * This function calls another completion callback handler which
+ * updates the statistics, and optionally updates the parent buffer
+ * use count before freeing the received packet.
+ */
+int mwifiex_recv_packet_complete(struct mwifiex_adapter *adapter,
+				 struct sk_buff *skb, int status)
+{
+	struct mwifiex_rxinfo *rx_info = MWIFIEX_SKB_RXCB(skb);
+	struct mwifiex_rxinfo *rx_info_parent = NULL;
+	struct mwifiex_private *priv;
+	struct sk_buff *skb_parent = NULL;
+	unsigned long flags;
+
+	priv = adapter->priv[rx_info->bss_index];
+
+	if (priv && (status == -1))
+		priv->stats.rx_dropped++;
+
+	if (rx_info->parent) {
+		skb_parent = rx_info->parent;
+		rx_info_parent = MWIFIEX_SKB_RXCB(skb_parent);
+
+		spin_lock_irqsave(&priv->rx_pkt_lock, flags);
+		--rx_info_parent->use_count;
+
+		if (!rx_info_parent->use_count) {
+			spin_unlock_irqrestore(&priv->rx_pkt_lock, flags);
+			dev_kfree_skb_any(skb_parent);
+		} else {
+			spin_unlock_irqrestore(&priv->rx_pkt_lock, flags);
+		}
+	} else {
+		dev_kfree_skb_any(skb);
+	}
+
+	return 0;
+}