[PATCH V2 2/4] mwl8k: Add timestamp information for tx packets

[Nishant Sarmukadam <nishants@marvell.com>]

From: Pradeep Nemavat <pnemavat@marvell.com>

Timestamp tx packets using a HW micro-second timer.
This timestamp will be compared to the current timestamp
in the hardware and if the difference is greater than 500ms,
the packet will be dropped.

Signed-off-by: Pradeep Nemavat <pnemavat@marvell.com>
Signed-off-by: Nishant Sarmukadam <nishants@marvell.com>
---
 drivers/net/wireless/mwl8k.c |   12 ++++++++++++
 1 files changed, 12 insertions(+), 0 deletions(-)

diff --git a/drivers/net/wireless/mwl8k.c b/drivers/net/wireless/mwl8k.c
index 7968301..aca0139 100644
--- a/drivers/net/wireless/mwl8k.c
+++ b/drivers/net/wireless/mwl8k.c
@@ -1792,6 +1792,14 @@ static inline void mwl8k_tx_count_packet(struct ieee80211_sta *sta, u8 tid)
 		tx_stats->pkts++;
 }
 
+/* HW micro second timer register
+ * located at offset 0xA600. This
+ * will be used to timestamp tx
+ * packets.
+ */
+
+#define	MWL8K_HW_TIMER_REGISTER	(priv->regs + 0xA600)
+
 static void
 mwl8k_txq_xmit(struct ieee80211_hw *hw, int index, struct sk_buff *skb)
 {
@@ -1972,6 +1980,10 @@ mwl8k_txq_xmit(struct ieee80211_hw *hw, int index, struct sk_buff *skb)
 		tx->peer_id = MWL8K_STA(tx_info->control.sta)->peer_id;
 	else
 		tx->peer_id = 0;
+
+	if (priv->ap_fw)
+		tx->timestamp = cpu_to_le32(ioread32(MWL8K_HW_TIMER_REGISTER));
+
 	wmb();
 	tx->status = cpu_to_le32(MWL8K_TXD_STATUS_FW_OWNED | txstatus);
 
-- 
1.6.0.3