1 files changed, 438 insertions, 0 deletions
diff --git a/drivers/net/wireless/rt2x00/rt2x00mac.c b/drivers/net/wireless/rt2x00/rt2x00mac.c
new file mode 100644
index 000000000000..4a6a0bd01ff1
--- /dev/null
+++ b/drivers/net/wireless/rt2x00/rt2x00mac.c
@@ -0,0 +1,438 @@
+/*
+	Copyright (C) 2004 - 2007 rt2x00 SourceForge Project
+	<http://rt2x00.serialmonkey.com>
+
+	This program is free software; you can redistribute it and/or modify
+	it under the terms of the GNU General Public License as published by
+	the Free Software Foundation; either version 2 of the License, or
+	(at your option) any later version.
+
+	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.,
+	59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+ */
+
+/*
+	Module: rt2x00mac
+	Abstract: rt2x00 generic mac80211 routines.
+ */
+
+/*
+ * Set enviroment defines for rt2x00.h
+ */
+#define DRV_NAME "rt2x00lib"
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+
+#include "rt2x00.h"
+#include "rt2x00lib.h"
+
+static int rt2x00mac_tx_rts_cts(struct rt2x00_dev *rt2x00dev,
+				struct data_ring *ring,
+				struct sk_buff *frag_skb,
+				struct ieee80211_tx_control *control)
+{
+	struct sk_buff *skb;
+	int size;
+
+	if (control->flags & IEEE80211_TXCTL_USE_CTS_PROTECT)
+		size = sizeof(struct ieee80211_cts);
+	else
+		size = sizeof(struct ieee80211_rts);
+
+	skb = dev_alloc_skb(size + rt2x00dev->hw->extra_tx_headroom);
+	if (!skb) {
+		WARNING(rt2x00dev, "Failed to create RTS/CTS frame.\n");
+		return NETDEV_TX_BUSY;
+	}
+
+	skb_reserve(skb, rt2x00dev->hw->extra_tx_headroom);
+	skb_put(skb, size);
+
+	if (control->flags & IEEE80211_TXCTL_USE_CTS_PROTECT)
+		ieee80211_ctstoself_get(rt2x00dev->hw, rt2x00dev->interface.id,
+					frag_skb->data, frag_skb->len, control,
+					(struct ieee80211_cts *)(skb->data));
+	else
+		ieee80211_rts_get(rt2x00dev->hw, rt2x00dev->interface.id,
+				  frag_skb->data, frag_skb->len, control,
+				  (struct ieee80211_rts *)(skb->data));
+
+	if (rt2x00dev->ops->lib->write_tx_data(rt2x00dev, ring, skb, control)) {
+		WARNING(rt2x00dev, "Failed to send RTS/CTS frame.\n");
+		return NETDEV_TX_BUSY;
+	}
+
+	return NETDEV_TX_OK;
+}
+
+int rt2x00mac_tx(struct ieee80211_hw *hw, struct sk_buff *skb,
+		 struct ieee80211_tx_control *control)
+{
+	struct rt2x00_dev *rt2x00dev = hw->priv;
+	struct ieee80211_hdr *ieee80211hdr = (struct ieee80211_hdr *)skb->data;
+	struct data_ring *ring;
+	u16 frame_control;
+
+	/*
+	 * Mac80211 might be calling this function while we are trying
+	 * to remove the device or perhaps suspending it.
+	 * Note that we can only stop the TX queues inside the TX path
+	 * due to possible race conditions in mac80211.
+	 */
+	if (!test_bit(DEVICE_PRESENT, &rt2x00dev->flags)) {
+		ieee80211_stop_queues(hw);
+		return 0;
+	}
+
+	/*
+	 * Determine which ring to put packet on.
+	 */
+	ring = rt2x00lib_get_ring(rt2x00dev, control->queue);
+	if (unlikely(!ring)) {
+		ERROR(rt2x00dev,
+		      "Attempt to send packet over invalid queue %d.\n"
+		      "Please file bug report to %s.\n",
+		      control->queue, DRV_PROJECT);
+		dev_kfree_skb_any(skb);
+		return NETDEV_TX_OK;
+	}
+
+	/*
+	 * If CTS/RTS is required. and this frame is not CTS or RTS,
+	 * create and queue that frame first. But make sure we have
+	 * at least enough entries available to send this CTS/RTS
+	 * frame as well as the data frame.
+	 */
+	frame_control = le16_to_cpu(ieee80211hdr->frame_control);
+	if (!is_rts_frame(frame_control) && !is_cts_frame(frame_control) &&
+	    (control->flags & (IEEE80211_TXCTL_USE_RTS_CTS |
+			       IEEE80211_TXCTL_USE_CTS_PROTECT))) {
+		if (rt2x00_ring_free(ring) <= 1)
+			return NETDEV_TX_BUSY;
+
+		if (rt2x00mac_tx_rts_cts(rt2x00dev, ring, skb, control))
+			return NETDEV_TX_BUSY;
+	}
+
+	if (rt2x00dev->ops->lib->write_tx_data(rt2x00dev, ring, skb, control))
+		return NETDEV_TX_BUSY;
+
+	if (rt2x00dev->ops->lib->kick_tx_queue)
+		rt2x00dev->ops->lib->kick_tx_queue(rt2x00dev, control->queue);
+
+	return NETDEV_TX_OK;
+}
+EXPORT_SYMBOL_GPL(rt2x00mac_tx);
+
+int rt2x00mac_start(struct ieee80211_hw *hw)
+{
+	struct rt2x00_dev *rt2x00dev = hw->priv;
+	int status;
+
+	if (!test_bit(DEVICE_PRESENT, &rt2x00dev->flags) ||
+	    test_bit(DEVICE_STARTED, &rt2x00dev->flags))
+		return 0;
+
+	/*
+	 * If this is the first interface which is added,
+	 * we should load the firmware now.
+	 */
+	if (test_bit(DRIVER_REQUIRE_FIRMWARE, &rt2x00dev->flags)) {
+		status = rt2x00lib_load_firmware(rt2x00dev);
+		if (status)
+			return status;
+	}
+
+	/*
+	 * Initialize the device.
+	 */
+	status = rt2x00lib_initialize(rt2x00dev);
+	if (status)
+		return status;
+
+	/*
+	 * Enable radio.
+	 */
+	status = rt2x00lib_enable_radio(rt2x00dev);
+	if (status) {
+		rt2x00lib_uninitialize(rt2x00dev);
+		return status;
+	}
+
+	__set_bit(DEVICE_STARTED, &rt2x00dev->flags);
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(rt2x00mac_start);
+
+void rt2x00mac_stop(struct ieee80211_hw *hw)
+{
+	struct rt2x00_dev *rt2x00dev = hw->priv;
+
+	if (!test_bit(DEVICE_PRESENT, &rt2x00dev->flags))
+		return;
+
+	/*
+	 * Perhaps we can add something smarter here,
+	 * but for now just disabling the radio should do.
+	 */
+	rt2x00lib_disable_radio(rt2x00dev);
+
+	__clear_bit(DEVICE_STARTED, &rt2x00dev->flags);
+}
+EXPORT_SYMBOL_GPL(rt2x00mac_stop);
+
+int rt2x00mac_add_interface(struct ieee80211_hw *hw,
+			    struct ieee80211_if_init_conf *conf)
+{
+	struct rt2x00_dev *rt2x00dev = hw->priv;
+	struct interface *intf = &rt2x00dev->interface;
+
+	/*
+	 * Don't allow interfaces to be added while
+	 * either the device has disappeared or when
+	 * another interface is already present.
+	 */
+	if (!test_bit(DEVICE_PRESENT, &rt2x00dev->flags) ||
+	    is_interface_present(intf))
+		return -ENOBUFS;
+
+	intf->id = conf->if_id;
+	intf->type = conf->type;
+	if (conf->type == IEEE80211_IF_TYPE_AP)
+		memcpy(&intf->bssid, conf->mac_addr, ETH_ALEN);
+	memcpy(&intf->mac, conf->mac_addr, ETH_ALEN);
+
+	/*
+	 * The MAC adddress must be configured after the device
+	 * has been initialized. Otherwise the device can reset
+	 * the MAC registers.
+	 */
+	rt2x00lib_config_mac_addr(rt2x00dev, intf->mac);
+	rt2x00lib_config_type(rt2x00dev, conf->type);
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(rt2x00mac_add_interface);
+
+void rt2x00mac_remove_interface(struct ieee80211_hw *hw,
+				struct ieee80211_if_init_conf *conf)
+{
+	struct rt2x00_dev *rt2x00dev = hw->priv;
+	struct interface *intf = &rt2x00dev->interface;
+
+	/*
+	 * Don't allow interfaces to be remove while
+	 * either the device has disappeared or when
+	 * no interface is present.
+	 */
+	if (!test_bit(DEVICE_PRESENT, &rt2x00dev->flags) ||
+	    !is_interface_present(intf))
+		return;
+
+	intf->id = 0;
+	intf->type = INVALID_INTERFACE;
+	memset(&intf->bssid, 0x00, ETH_ALEN);
+	memset(&intf->mac, 0x00, ETH_ALEN);
+
+	/*
+	 * Make sure the bssid and mac address registers
+	 * are cleared to prevent false ACKing of frames.
+	 */
+	rt2x00lib_config_mac_addr(rt2x00dev, intf->mac);
+	rt2x00lib_config_bssid(rt2x00dev, intf->bssid);
+	rt2x00lib_config_type(rt2x00dev, intf->type);
+}
+EXPORT_SYMBOL_GPL(rt2x00mac_remove_interface);
+
+int rt2x00mac_config(struct ieee80211_hw *hw, struct ieee80211_conf *conf)
+{
+	struct rt2x00_dev *rt2x00dev = hw->priv;
+
+	/*
+	 * Mac80211 might be calling this function while we are trying
+	 * to remove the device or perhaps suspending it.
+	 */
+	if (!test_bit(DEVICE_PRESENT, &rt2x00dev->flags))
+		return 0;
+
+	/*
+	 * Check if we need to disable the radio,
+	 * if this is not the case, at least the RX must be disabled.
+	 */
+	if (test_bit(DEVICE_ENABLED_RADIO, &rt2x00dev->flags)) {
+		if (!conf->radio_enabled)
+			rt2x00lib_disable_radio(rt2x00dev);
+		else
+			rt2x00lib_toggle_rx(rt2x00dev, STATE_RADIO_RX_OFF);
+	}
+
+	rt2x00lib_config(rt2x00dev, conf, 0);
+
+	/*
+	 * Reenable RX only if the radio should be on.
+	 */
+	if (test_bit(DEVICE_ENABLED_RADIO, &rt2x00dev->flags))
+		rt2x00lib_toggle_rx(rt2x00dev, STATE_RADIO_RX_ON);
+	else if (conf->radio_enabled)
+		return rt2x00lib_enable_radio(rt2x00dev);
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(rt2x00mac_config);
+
+int rt2x00mac_config_interface(struct ieee80211_hw *hw, int if_id,
+			       struct ieee80211_if_conf *conf)
+{
+	struct rt2x00_dev *rt2x00dev = hw->priv;
+	struct interface *intf = &rt2x00dev->interface;
+	int status;
+
+	/*
+	 * Mac80211 might be calling this function while we are trying
+	 * to remove the device or perhaps suspending it.
+	 */
+	if (!test_bit(DEVICE_PRESENT, &rt2x00dev->flags))
+		return 0;
+
+	/*
+	 * If the given type does not match the configured type,
+	 * there has been a problem.
+	 */
+	if (conf->type != intf->type)
+		return -EINVAL;
+
+	/*
+	 * If the interface does not work in master mode,
+	 * then the bssid value in the interface structure
+	 * should now be set.
+	 */
+	if (conf->type != IEEE80211_IF_TYPE_AP)
+		memcpy(&intf->bssid, conf->bssid, ETH_ALEN);
+	rt2x00lib_config_bssid(rt2x00dev, intf->bssid);
+
+	/*
+	 * We only need to initialize the beacon when master mode is enabled.
+	 */
+	if (conf->type != IEEE80211_IF_TYPE_AP || !conf->beacon)
+		return 0;
+
+	status = rt2x00dev->ops->hw->beacon_update(rt2x00dev->hw,
+						   conf->beacon,
+						   conf->beacon_control);
+	if (status)
+		dev_kfree_skb(conf->beacon);
+
+	return status;
+}
+EXPORT_SYMBOL_GPL(rt2x00mac_config_interface);
+
+int rt2x00mac_get_stats(struct ieee80211_hw *hw,
+			struct ieee80211_low_level_stats *stats)
+{
+	struct rt2x00_dev *rt2x00dev = hw->priv;
+
+	/*
+	 * The dot11ACKFailureCount, dot11RTSFailureCount and
+	 * dot11RTSSuccessCount are updated in interrupt time.
+	 * dot11FCSErrorCount is updated in the link tuner.
+	 */
+	memcpy(stats, &rt2x00dev->low_level_stats, sizeof(*stats));
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(rt2x00mac_get_stats);
+
+int rt2x00mac_get_tx_stats(struct ieee80211_hw *hw,
+			   struct ieee80211_tx_queue_stats *stats)
+{
+	struct rt2x00_dev *rt2x00dev = hw->priv;
+	unsigned int i;
+
+	for (i = 0; i < hw->queues; i++)
+		memcpy(&stats->data[i], &rt2x00dev->tx[i].stats,
+		       sizeof(rt2x00dev->tx[i].stats));
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(rt2x00mac_get_tx_stats);
+
+void rt2x00mac_erp_ie_changed(struct ieee80211_hw *hw, u8 changes,
+			      int cts_protection, int preamble)
+{
+	struct rt2x00_dev *rt2x00dev = hw->priv;
+	int short_preamble;
+	int ack_timeout;
+	int ack_consume_time;
+	int difs;
+
+	/*
+	 * We only support changing preamble mode.
+	 */
+	if (!(changes & IEEE80211_ERP_CHANGE_PREAMBLE))
+		return;
+
+	short_preamble = !preamble;
+	preamble = !!(preamble) ? PREAMBLE : SHORT_PREAMBLE;
+
+	difs = (hw->conf.flags & IEEE80211_CONF_SHORT_SLOT_TIME) ?
+		SHORT_DIFS : DIFS;
+	ack_timeout = difs + PLCP + preamble + get_duration(ACK_SIZE, 10);
+
+	ack_consume_time = SIFS + PLCP + preamble + get_duration(ACK_SIZE, 10);
+
+	if (short_preamble)
+		__set_bit(CONFIG_SHORT_PREAMBLE, &rt2x00dev->flags);
+	else
+		__clear_bit(CONFIG_SHORT_PREAMBLE, &rt2x00dev->flags);
+
+	rt2x00dev->ops->lib->config_preamble(rt2x00dev, short_preamble,
+					     ack_timeout, ack_consume_time);
+}
+EXPORT_SYMBOL_GPL(rt2x00mac_erp_ie_changed);
+
+int rt2x00mac_conf_tx(struct ieee80211_hw *hw, int queue,
+		      const struct ieee80211_tx_queue_params *params)
+{
+	struct rt2x00_dev *rt2x00dev = hw->priv;
+	struct data_ring *ring;
+
+	ring = rt2x00lib_get_ring(rt2x00dev, queue);
+	if (unlikely(!ring))
+		return -EINVAL;
+
+	/*
+	 * The passed variables are stored as real value ((2^n)-1).
+	 * Ralink registers require to know the bit number 'n'.
+	 */
+	if (params->cw_min)
+		ring->tx_params.cw_min = fls(params->cw_min);
+	else
+		ring->tx_params.cw_min = 5; /* cw_min: 2^5 = 32. */
+
+	if (params->cw_max)
+		ring->tx_params.cw_max = fls(params->cw_max);
+	else
+		ring->tx_params.cw_max = 10; /* cw_min: 2^10 = 1024. */
+
+	if (params->aifs)
+		ring->tx_params.aifs = params->aifs;
+	else
+		ring->tx_params.aifs = 2;
+
+	INFO(rt2x00dev,
+	     "Configured TX ring %d - CWmin: %d, CWmax: %d, Aifs: %d.\n",
+	     queue, ring->tx_params.cw_min, ring->tx_params.cw_max,
+	     ring->tx_params.aifs);
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(rt2x00mac_conf_tx);