carl9170: move beacon_update into tx.c

Signed-off-by: Christian Lamparter <chunkeey@googlemail.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

1 files changed, 129 insertions, 0 deletions

diff --git a/drivers/net/wireless/ath/carl9170/tx.c b/drivers/net/wireless/ath/carl9170/tx.c
index e94084fcf6f..0f8cdeffd64 100644
--- a/drivers/net/wireless/ath/carl9170/tx.c
+++ b/drivers/net/wireless/ath/carl9170/tx.c
@@ -1438,3 +1438,132 @@ void carl9170_tx_scheduler(struct ar9170 *ar)
 	if (ar->tx_schedule)
 		carl9170_tx(ar);
 }
+
+int carl9170_update_beacon(struct ar9170 *ar, const bool submit)
+{
+	struct sk_buff *skb = NULL;
+	struct carl9170_vif_info *cvif;
+	struct ieee80211_tx_info *txinfo;
+	__le32 *data, *old = NULL;
+	u32 word, off, addr, len;
+	int i = 0, err = 0;
+
+	rcu_read_lock();
+	cvif = rcu_dereference(ar->beacon_iter);
+retry:
+	if (ar->vifs == 0 || !cvif)
+		goto out_unlock;
+
+	list_for_each_entry_continue_rcu(cvif, &ar->vif_list, list) {
+		if (cvif->active && cvif->enable_beacon)
+			goto found;
+	}
+
+	if (!ar->beacon_enabled || i++)
+		goto out_unlock;
+
+	goto retry;
+
+found:
+	rcu_assign_pointer(ar->beacon_iter, cvif);
+
+	skb = ieee80211_beacon_get_tim(ar->hw, carl9170_get_vif(cvif),
+		NULL, NULL);
+
+	if (!skb) {
+		err = -ENOMEM;
+		goto err_free;
+	}
+
+	txinfo = IEEE80211_SKB_CB(skb);
+	if (txinfo->control.rates[0].flags & IEEE80211_TX_RC_MCS) {
+		err = -EINVAL;
+		goto err_free;
+	}
+
+	spin_lock_bh(&ar->beacon_lock);
+	data = (__le32 *)skb->data;
+	if (cvif->beacon)
+		old = (__le32 *)cvif->beacon->data;
+
+	off = cvif->id * AR9170_MAC_BCN_LENGTH_MAX;
+	addr = ar->fw.beacon_addr + off;
+	len = roundup(skb->len + FCS_LEN, 4);
+
+	if ((off + len) > ar->fw.beacon_max_len) {
+		if (net_ratelimit()) {
+			wiphy_err(ar->hw->wiphy, "beacon does not "
+				  "fit into device memory!\n");
+		}
+		err = -EINVAL;
+		goto err_unlock;
+	}
+
+	if (len > AR9170_MAC_BCN_LENGTH_MAX) {
+		if (net_ratelimit()) {
+			wiphy_err(ar->hw->wiphy, "no support for beacons "
+				"bigger than %d (yours:%d).\n",
+				 AR9170_MAC_BCN_LENGTH_MAX, len);
+		}
+
+		err = -EMSGSIZE;
+		goto err_unlock;
+	}
+
+	i = txinfo->control.rates[0].idx;
+	if (txinfo->band != IEEE80211_BAND_2GHZ)
+		i += 4;
+
+	word = __carl9170_ratetable[i].hw_value & 0xf;
+	if (i < 4)
+		word |= ((skb->len + FCS_LEN) << (3 + 16)) + 0x0400;
+	else
+		word |= ((skb->len + FCS_LEN) << 16) + 0x0010;
+
+	carl9170_async_regwrite_begin(ar);
+	carl9170_async_regwrite(AR9170_MAC_REG_BCN_PLCP, word);
+
+	for (i = 0; i < DIV_ROUND_UP(skb->len, 4); i++) {
+		/*
+		 * XXX: This accesses beyond skb data for up
+		 *	to the last 3 bytes!!
+		 */
+
+		if (old && (data[i] == old[i]))
+			continue;
+
+		word = le32_to_cpu(data[i]);
+		carl9170_async_regwrite(addr + 4 * i, word);
+	}
+	carl9170_async_regwrite_finish();
+
+	dev_kfree_skb_any(cvif->beacon);
+	cvif->beacon = NULL;
+
+	err = carl9170_async_regwrite_result();
+	if (!err)
+		cvif->beacon = skb;
+	spin_unlock_bh(&ar->beacon_lock);
+	if (err)
+		goto err_free;
+
+	if (submit) {
+		err = carl9170_bcn_ctrl(ar, cvif->id,
+					CARL9170_BCN_CTRL_CAB_TRIGGER,
+					addr, skb->len + FCS_LEN);
+
+		if (err)
+			goto err_free;
+	}
+out_unlock:
+	rcu_read_unlock();
+	return 0;
+
+err_unlock:
+	spin_unlock_bh(&ar->beacon_lock);
+
+err_free:
+	rcu_read_unlock();
+	dev_kfree_skb_any(skb);
+	return err;
+}