[PATCH] Marvell Libertas 8388 802.11b/g USB driver

Add the Marvell Libertas 8388 802.11 USB driver.

Signed-off-by: Marcelo Tosatti <marcelo@kvack.org>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

1 files changed, 285 insertions, 0 deletions

diff --git a/drivers/net/wireless/libertas/tx.c b/drivers/net/wireless/libertas/tx.c
new file mode 100644
index 000000000000..82d06223043e
--- /dev/null
+++ b/drivers/net/wireless/libertas/tx.c
@@ -0,0 +1,285 @@
+/**
+  * This file contains the handling of TX in wlan driver.
+  */
+#include <linux/netdevice.h>
+
+#include "hostcmd.h"
+#include "radiotap.h"
+#include "sbi.h"
+#include "decl.h"
+#include "defs.h"
+#include "dev.h"
+#include "wext.h"
+
+/**
+ *  @brief This function converts Tx/Rx rates from IEEE80211_RADIOTAP_RATE
+ *  units (500 Kb/s) into Marvell WLAN format (see Table 8 in Section 3.2.1)
+ *
+ *  @param rate    Input rate
+ *  @return      Output Rate (0 if invalid)
+ */
+static u32 convert_radiotap_rate_to_mv(u8 rate)
+{
+	switch (rate) {
+	case 2:		/*   1 Mbps */
+		return 0 | (1 << 4);
+	case 4:		/*   2 Mbps */
+		return 1 | (1 << 4);
+	case 11:		/* 5.5 Mbps */
+		return 2 | (1 << 4);
+	case 22:		/*  11 Mbps */
+		return 3 | (1 << 4);
+	case 12:		/*   6 Mbps */
+		return 4 | (1 << 4);
+	case 18:		/*   9 Mbps */
+		return 5 | (1 << 4);
+	case 24:		/*  12 Mbps */
+		return 6 | (1 << 4);
+	case 36:		/*  18 Mbps */
+		return 7 | (1 << 4);
+	case 48:		/*  24 Mbps */
+		return 8 | (1 << 4);
+	case 72:		/*  36 Mbps */
+		return 9 | (1 << 4);
+	case 96:		/*  48 Mbps */
+		return 10 | (1 << 4);
+	case 108:		/*  54 Mbps */
+		return 11 | (1 << 4);
+	}
+	return 0;
+}
+
+/**
+ *  @brief This function processes a single packet and sends
+ *  to IF layer
+ *
+ *  @param priv    A pointer to wlan_private structure
+ *  @param skb     A pointer to skb which includes TX packet
+ *  @return 	   0 or -1
+ */
+static int SendSinglePacket(wlan_private * priv, struct sk_buff *skb)
+{
+	wlan_adapter *adapter = priv->adapter;
+	int ret = 0;
+	struct txpd localtxpd;
+	struct txpd *plocaltxpd = &localtxpd;
+	u8 *p802x_hdr;
+	struct tx_radiotap_hdr *pradiotap_hdr;
+	u32 new_rate;
+	u8 *ptr = priv->adapter->tmptxbuf;
+
+	ENTER();
+
+	if (priv->adapter->surpriseremoved)
+		return -1;
+
+	if ((priv->adapter->debugmode & MRVDRV_DEBUG_TX_PATH) != 0)
+		lbs_dbg_hex("TX packet: ", skb->data,
+			 min_t(unsigned int, skb->len, 100));
+
+	if (!skb->len || (skb->len > MRVDRV_ETH_TX_PACKET_BUFFER_SIZE)) {
+		lbs_pr_debug(1, "Tx error: Bad skb length %d : %d\n",
+		       skb->len, MRVDRV_ETH_TX_PACKET_BUFFER_SIZE);
+		ret = -1;
+		goto done;
+	}
+
+	memset(plocaltxpd, 0, sizeof(struct txpd));
+
+	plocaltxpd->tx_packet_length = skb->len;
+
+	/* offset of actual data */
+	plocaltxpd->tx_packet_location = sizeof(struct txpd);
+
+	/* TxCtrl set by user or default */
+	plocaltxpd->tx_control = adapter->pkttxctrl;
+
+	p802x_hdr = skb->data;
+	if (priv->adapter->radiomode == WLAN_RADIOMODE_RADIOTAP) {
+
+		/* locate radiotap header */
+		pradiotap_hdr = (struct tx_radiotap_hdr *)skb->data;
+
+		/* set txpd fields from the radiotap header */
+		new_rate = convert_radiotap_rate_to_mv(pradiotap_hdr->rate);
+		if (new_rate != 0) {
+			/* erase tx_control[4:0] */
+			plocaltxpd->tx_control &= ~0x1f;
+			/* write new tx_control[4:0] */
+			plocaltxpd->tx_control |= new_rate;
+		}
+
+		/* skip the radiotap header */
+		p802x_hdr += sizeof(struct tx_radiotap_hdr);
+		plocaltxpd->tx_packet_length -= sizeof(struct tx_radiotap_hdr);
+
+	}
+	/* copy destination address from 802.3 or 802.11 header */
+	if (priv->adapter->linkmode == WLAN_LINKMODE_802_11)
+		memcpy(plocaltxpd->tx_dest_addr_high, p802x_hdr + 4, ETH_ALEN);
+	else
+		memcpy(plocaltxpd->tx_dest_addr_high, p802x_hdr, ETH_ALEN);
+
+	lbs_dbg_hex("txpd", (u8 *) plocaltxpd, sizeof(struct txpd));
+
+	if (IS_MESH_FRAME(skb)) {
+		plocaltxpd->tx_control |= TxPD_MESH_FRAME;
+	}
+
+	memcpy(ptr, plocaltxpd, sizeof(struct txpd));
+
+	ptr += sizeof(struct txpd);
+
+	lbs_dbg_hex("Tx Data", (u8 *) p802x_hdr, plocaltxpd->tx_packet_length);
+	memcpy(ptr, p802x_hdr, plocaltxpd->tx_packet_length);
+	ret = libertas_sbi_host_to_card(priv, MVMS_DAT,
+			       priv->adapter->tmptxbuf,
+			       plocaltxpd->tx_packet_length +
+			       sizeof(struct txpd));
+
+	if (ret) {
+		lbs_pr_debug(1, "Tx error: libertas_sbi_host_to_card failed: 0x%X\n", ret);
+		goto done;
+	}
+
+	lbs_pr_debug(1, "SendSinglePacket succeeds\n");
+
+      done:
+	if (!ret) {
+		priv->stats.tx_packets++;
+		priv->stats.tx_bytes += skb->len;
+	} else {
+		priv->stats.tx_dropped++;
+		priv->stats.tx_errors++;
+	}
+
+	if (!ret && priv->adapter->radiomode == WLAN_RADIOMODE_RADIOTAP) {
+		/* Keep the skb to echo it back once Tx feedback is
+		   received from FW */
+		skb_orphan(skb);
+		/* stop processing outgoing pkts */
+		netif_stop_queue(priv->wlan_dev.netdev);
+		/* freeze any packets already in our queues */
+		priv->adapter->TxLockFlag = 1;
+	} else {
+		dev_kfree_skb_any(skb);
+		priv->adapter->currenttxskb = NULL;
+	}
+
+	LEAVE();
+	return ret;
+}
+
+
+void libertas_tx_runqueue(wlan_private *priv)
+{
+	wlan_adapter *adapter = priv->adapter;
+	int i;
+
+	spin_lock(&adapter->txqueue_lock);
+	for (i = 0; i < adapter->tx_queue_idx; i++) {
+		struct sk_buff *skb = adapter->tx_queue_ps[i];
+		spin_unlock(&adapter->txqueue_lock);
+		SendSinglePacket(priv, skb);
+		spin_lock(&adapter->txqueue_lock);
+	}
+	adapter->tx_queue_idx = 0;
+	spin_unlock(&adapter->txqueue_lock);
+}
+
+static void wlan_tx_queue(wlan_private *priv, struct sk_buff *skb)
+{
+	wlan_adapter *adapter = priv->adapter;
+
+	spin_lock(&adapter->txqueue_lock);
+
+	WARN_ON(priv->adapter->tx_queue_idx >= NR_TX_QUEUE);
+	adapter->tx_queue_ps[adapter->tx_queue_idx++] = skb;
+	if (adapter->tx_queue_idx == NR_TX_QUEUE)
+		netif_stop_queue(priv->wlan_dev.netdev);
+	else
+		netif_start_queue(priv->wlan_dev.netdev);
+
+	spin_unlock(&adapter->txqueue_lock);
+}
+
+/**
+ *  @brief This function checks the conditions and sends packet to IF
+ *  layer if everything is ok.
+ *
+ *  @param priv    A pointer to wlan_private structure
+ *  @return 	   n/a
+ */
+int libertas_process_tx(wlan_private * priv, struct sk_buff *skb)
+{
+	int ret = -1;
+
+	ENTER();
+
+	lbs_dbg_hex("TX Data", skb->data, min_t(unsigned int, skb->len, 100));
+
+	if (priv->wlan_dev.dnld_sent) {
+		lbs_pr_alert( "TX error: dnld_sent = %d, not sending\n",
+		       priv->wlan_dev.dnld_sent);
+		goto done;
+	}
+
+	if ((priv->adapter->psstate == PS_STATE_SLEEP) ||
+	    (priv->adapter->psstate == PS_STATE_PRE_SLEEP)) {
+		wlan_tx_queue(priv, skb);
+		return ret;
+	}
+
+	priv->adapter->currenttxskb = skb;
+
+	ret = SendSinglePacket(priv, skb);
+done:
+	LEAVE();
+	return ret;
+}
+
+/**
+ *  @brief This function sends to the host the last transmitted packet,
+ *  filling the radiotap headers with transmission information.
+ *
+ *  @param priv     A pointer to wlan_private structure
+ *  @param status   A 32 bit value containing transmission status.
+ *
+ *  @returns void
+ */
+void libertas_send_tx_feedback(wlan_private * priv)
+{
+	wlan_adapter *adapter = priv->adapter;
+	struct tx_radiotap_hdr *radiotap_hdr;
+	u32 status = adapter->eventcause;
+	int txfail;
+	int try_count;
+
+	if (adapter->radiomode != WLAN_RADIOMODE_RADIOTAP ||
+	    adapter->currenttxskb == NULL)
+		return;
+
+	radiotap_hdr = (struct tx_radiotap_hdr *)adapter->currenttxskb->data;
+
+	if ((adapter->debugmode & MRVDRV_DEBUG_TX_PATH) != 0)
+		lbs_dbg_hex("TX feedback: ", (u8 *) radiotap_hdr,
+			min_t(unsigned int, adapter->currenttxskb->len, 100));
+
+	txfail = (status >> 24);
+
+#if 0
+	/* The version of roofnet that we've tested does not use this yet
+	 * But it may be used in the future.
+	 */
+	if (txfail)
+		radiotap_hdr->flags &= IEEE80211_RADIOTAP_F_TX_FAIL;
+#endif
+	try_count = (status >> 16) & 0xff;
+	radiotap_hdr->data_retries = (try_count) ?
+	    (1 + adapter->txretrycount - try_count) : 0;
+	libertas_upload_rx_packet(priv, adapter->currenttxskb);
+	adapter->currenttxskb = NULL;
+	priv->adapter->TxLockFlag = 0;
+	if (priv->adapter->connect_status == libertas_connected)
+		netif_wake_queue(priv->wlan_dev.netdev);
+}