[IWLWIFI]: add iwlwifi wireless drivers

This patch adds the mac80211 based wireless drivers for the Intel
PRO/Wireless 3945ABG/BG Network Connection and Intel Wireless WiFi
Link AGN (4965) adapters.

[ Move driver into it's own directory -DaveM ]

Signed-off-by: Zhu Yi <yi.zhu@intel.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

27 files changed, 34824 insertions, 0 deletions

diff --git a/drivers/net/wireless/Kconfig b/drivers/net/wireless/Kconfig
index c2102653b2a9..085ba132835f 100644
--- a/drivers/net/wireless/Kconfig
+++ b/drivers/net/wireless/Kconfig
@@ -577,6 +577,7 @@ config ADM8211
 
 	  Thanks to Infineon-ADMtek for their support of this driver.
 
+source "drivers/net/wireless/iwlwifi/Kconfig"
 source "drivers/net/wireless/hostap/Kconfig"
 source "drivers/net/wireless/bcm43xx/Kconfig"
 source "drivers/net/wireless/b43/Kconfig"
diff --git a/drivers/net/wireless/Makefile b/drivers/net/wireless/Makefile
index d8dd907e4999..351024f2fe72 100644
--- a/drivers/net/wireless/Makefile
+++ b/drivers/net/wireless/Makefile
@@ -51,3 +51,5 @@ rtl8187-objs		:= rtl8187_dev.o rtl8187_rtl8225.o
 obj-$(CONFIG_RTL8187)	+= rtl8187.o
 
 obj-$(CONFIG_ADM8211)	+= adm8211.o
+
+obj-$(CONFIG_IWLWIFI)	+= iwlwifi/
diff --git a/drivers/net/wireless/iwlwifi/Kconfig b/drivers/net/wireless/iwlwifi/Kconfig
new file mode 100644
index 000000000000..25cfc6c32509
--- /dev/null
+++ b/drivers/net/wireless/iwlwifi/Kconfig
@@ -0,0 +1,128 @@
+config IWLWIFI
+	bool "Intel Wireless WiFi Link Drivers"
+	depends on PCI && MAC80211 && WLAN_80211 && EXPERIMENTAL
+	select FW_LOADER
+	default n
+	---help---
+	  Select to enable drivers based on the iwlwifi project.  This
+	  project provides a common foundation for Intel's wireless
+	  drivers designed to use the mac80211 subsystem.
+
+	  See <file:Documentation/networking/README.iwlwifi> for
+	  information on the capabilities currently enabled in this
+	  driver and for tips for debugging issues and problems.
+
+config IWLWIFI_DEBUG
+	bool "Enable full debugging output in iwlwifi drivers"
+	depends on IWLWIFI
+	default y
+	---help---
+	  This option will enable debug tracing output for the iwlwifi
+	  drivers.
+
+	  This will result in the kernel module being ~100k larger.  You can
+	  control which debug output is sent to the kernel log by setting the
+	  value in
+
+	          /sys/bus/pci/drivers/${DRIVER}/debug_level
+
+	  This entry will only exist if this option is enabled.
+
+	  To set a value, simply echo an 8-byte hex value to the same file:
+
+		  % echo 0x43fff > /sys/bus/pci/drivers/${DRIVER}/debug_level
+
+	  You can find the list of debug mask values in:
+		  drivers/net/wireless/mac80211/iwlwifi/iwl-debug.h
+
+	  If this is your first time using this driver, you should say Y here
+	  as the debug information can assist others in helping you resolve
+	  any problems you may encounter.
+
+config IWLWIFI_SENSITIVITY
+	bool "Enable Sensitivity Calibration in iwlwifi drivers"
+	depends on IWLWIFI
+	default y
+	---help---
+	  This option will enable sensitivity calibration for the iwlwifi
+	  drivers.
+
+config IWLWIFI_SPECTRUM_MEASUREMENT
+	bool "Enable Spectrum Measurement in iwlwifi drivers"
+	depends on IWLWIFI
+	default y
+	---help---
+	  This option will enable spectrum measurement for the iwlwifi drivers.
+
+config IWLWIFI_QOS
+	bool "Enable Wireless QoS in iwlwifi drivers"
+	depends on IWLWIFI
+	default y
+	---help---
+	  This option will enable wireless quality of service (QoS) for the
+	  iwlwifi drivers.
+
+config IWLWIFI_HT
+	bool "Enable 802.11n HT features in iwlwifi drivers"
+	depends on EXPERIMENTAL
+	depends on IWLWIFI && MAC80211_HT
+	default n
+	---help---
+	  This option enables IEEE 802.11n High Throughput features
+	  for the iwlwifi drivers.
+
+config IWL4965
+	tristate "Intel Wireless WiFi 4965AGN"
+	depends on m && IWLWIFI && EXPERIMENTAL
+	default m
+	---help---
+	  Select to build the driver supporting the:
+
+	  Intel Wireless WiFi Link 4965AGN
+
+	  This driver uses the kernel's mac80211 subsystem.
+
+	  See <file:Documentation/networking/README.iwlwifi> for
+	  information on the capabilities currently enabled in this
+	  driver and for tips for debugging any issues or problems.
+
+	  In order to use this driver, you will need a microcode (uCode)
+	  image for it. You can obtain the microcode from:
+
+	          <http://intellinuxwireless.org/>.
+
+	  See the above referenced README.iwlwifi for information on where
+	  to install the microcode images.
+
+	  If you want to compile the driver as a module ( = code which can be
+	  inserted in and remvoed from the running kernel whenever you want),
+	  say M here and read <file:Documentation/modules.txt>.  The module
+	  will be called iwl4965.ko.
+
+config IWL3945
+	tristate "Intel PRO/Wireless 3945ABG/BG Network Connection"
+	depends on m && IWLWIFI && EXPERIMENTAL
+	default m
+	---help---
+	  Select to build the driver supporting the:
+
+	  Intel PRO/Wireless 3945ABG/BG Network Connection
+
+	  This driver uses the kernel's mac80211 subsystem.
+
+	  See <file:Documentation/networking/README.iwlwifi> for
+	  information on the capabilities currently enabled in this
+	  driver and for tips for debugging any issues or problems.
+
+	  In order to use this driver, you will need a microcode (uCode)
+	  image for it. You can obtain the microcode from:
+
+	          <http://intellinuxwireless.org/>.
+
+	  See the above referenced README.iwlwifi for information on where
+	  to install the microcode images.
+
+	  If you want to compile the driver as a module ( = code which can be
+	  inserted in and remvoed from the running kernel whenever you want),
+	  say M here and read <file:Documentation/modules.txt>.  The module
+	  will be called iwl3945.ko.
diff --git a/drivers/net/wireless/iwlwifi/Makefile b/drivers/net/wireless/iwlwifi/Makefile
new file mode 100644
index 000000000000..03837ff54312
--- /dev/null
+++ b/drivers/net/wireless/iwlwifi/Makefile
@@ -0,0 +1,11 @@
+obj-$(CONFIG_IWL3945)	+= iwl3945.o
+iwl3945-objs		= iwl3945-base.o iwl-3945.o iwl-3945-rs.o
+CFLAGS_iwl3945-base.o	= -DIWL=3945
+CFLAGS_iwl-3945.o	= -DIWL=3945
+CFLAGS_iwl-3945-rs.o	= -DIWL=3945
+
+obj-$(CONFIG_IWL4965)	+= iwl4965.o
+iwl4965-objs		= iwl4965-base.o iwl-4965.o iwl-4965-rs.o
+CFLAGS_iwl4965-base.o	= -DIWL=4965
+CFLAGS_iwl-4965.o	= -DIWL=4965
+CFLAGS_iwl-4965-rs.o	= -DIWL=4965
diff --git a/drivers/net/wireless/iwlwifi/iwl-3945-hw.h b/drivers/net/wireless/iwlwifi/iwl-3945-hw.h
new file mode 100644
index 000000000000..fb5f0649f4f6
--- /dev/null
+++ b/drivers/net/wireless/iwlwifi/iwl-3945-hw.h
@@ -0,0 +1,118 @@
+/******************************************************************************
+ *
+ * This file is provided under a dual BSD/GPLv2 license.  When using or
+ * redistributing this file, you may do so under either license.
+ *
+ * GPL LICENSE SUMMARY
+ *
+ * Copyright(c) 2005 - 2007 Intel Corporation. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of version 2 of the GNU Geeral Public License as
+ * published by the Free Software Foundation.
+ *
+ * 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110,
+ * USA
+ *
+ * The full GNU General Public License is included in this distribution
+ * in the file called LICENSE.GPL.
+ *
+ * Contact Information:
+ * James P. Ketrenos <ipw2100-admin@linux.intel.com>
+ * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
+ *
+ * BSD LICENSE
+ *
+ * Copyright(c) 2005 - 2007 Intel Corporation. All rights reserved.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ *  * Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ *  * Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ *  * Neither the name Intel Corporation nor the names of its
+ *    contributors may be used to endorse or promote products derived
+ *    from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ *****************************************************************************/
+
+#ifndef __iwl_3945_hw__
+#define __iwl_3945_hw__
+
+#define IWL_RX_BUF_SIZE 3000
+/* card static random access memory (SRAM) for processor data and instructs */
+#define ALM_RTC_INST_UPPER_BOUND		(0x014000)
+#define ALM_RTC_DATA_UPPER_BOUND		(0x808000)
+
+#define ALM_RTC_INST_SIZE (ALM_RTC_INST_UPPER_BOUND - RTC_INST_LOWER_BOUND)
+#define ALM_RTC_DATA_SIZE (ALM_RTC_DATA_UPPER_BOUND - RTC_DATA_LOWER_BOUND)
+
+#define IWL_MAX_BSM_SIZE ALM_RTC_INST_SIZE
+#define IWL_MAX_INST_SIZE ALM_RTC_INST_SIZE
+#define IWL_MAX_DATA_SIZE ALM_RTC_DATA_SIZE
+#define IWL_MAX_NUM_QUEUES	8
+
+static inline int iwl_hw_valid_rtc_data_addr(u32 addr)
+{
+	return (addr >= RTC_DATA_LOWER_BOUND) &&
+	       (addr < ALM_RTC_DATA_UPPER_BOUND);
+}
+
+/* Base physical address of iwl_shared is provided to FH_TSSR_CBB_BASE
+ * and &iwl_shared.rx_read_ptr[0] is provided to FH_RCSR_RPTR_ADDR(0) */
+struct iwl_shared {
+	__le32 tx_base_ptr[8];
+	__le32 rx_read_ptr[3];
+} __attribute__ ((packed));
+
+struct iwl_tfd_frame_data {
+	__le32 addr;
+	__le32 len;
+} __attribute__ ((packed));
+
+struct iwl_tfd_frame {
+	__le32 control_flags;
+	struct iwl_tfd_frame_data pa[4];
+	u8 reserved[28];
+} __attribute__ ((packed));
+
+static inline u8 iwl_hw_get_rate(__le16 rate_n_flags)
+{
+	return le16_to_cpu(rate_n_flags) & 0xFF;
+}
+
+static inline u16 iwl_hw_get_rate_n_flags(__le16 rate_n_flags)
+{
+	return le16_to_cpu(rate_n_flags);
+}
+
+static inline __le16 iwl_hw_set_rate_n_flags(u8 rate, u16 flags)
+{
+	return cpu_to_le16((u16)rate|flags);
+}
+#endif
diff --git a/drivers/net/wireless/iwlwifi/iwl-3945-rs.c b/drivers/net/wireless/iwlwifi/iwl-3945-rs.c
new file mode 100644
index 000000000000..a4f4c8798a83
--- /dev/null
+++ b/drivers/net/wireless/iwlwifi/iwl-3945-rs.c
@@ -0,0 +1,979 @@
+/******************************************************************************
+ *
+ * Copyright(c) 2005 - 2007 Intel Corporation. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of version 2 of the GNU General Public License as
+ * published by the Free Software Foundation.
+ *
+ * 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.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110, USA
+ *
+ * The full GNU General Public License is included in this distribution in the
+ * file called LICENSE.
+ *
+ * Contact Information:
+ * James P. Ketrenos <ipw2100-admin@linux.intel.com>
+ * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
+ *
+ *****************************************************************************/
+
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/skbuff.h>
+#include <linux/wireless.h>
+#include <net/mac80211.h>
+#include <net/ieee80211.h>
+
+#include <linux/netdevice.h>
+#include <linux/etherdevice.h>
+#include <linux/delay.h>
+
+#include <linux/workqueue.h>
+
+#include <net/mac80211.h>
+#include <linux/wireless.h>
+
+#include "../net/mac80211/ieee80211_rate.h"
+
+#include "iwlwifi.h"
+
+#define RS_NAME "iwl-3945-rs"
+
+struct iwl_rate_scale_data {
+	u64 data;
+	s32 success_counter;
+	s32 success_ratio;
+	s32 counter;
+	s32 average_tpt;
+	unsigned long stamp;
+};
+
+struct iwl_rate_scale_priv {
+	spinlock_t lock;
+	s32 *expected_tpt;
+	unsigned long last_partial_flush;
+	unsigned long last_flush;
+	u32 flush_time;
+	u32 last_tx_packets;
+	u32 tx_packets;
+	u8 tgg;
+	u8 flush_pending;
+	u8 start_rate;
+	u8 ibss_sta_added;
+	struct timer_list rate_scale_flush;
+	struct iwl_rate_scale_data win[IWL_RATE_COUNT];
+};
+
+static s32 iwl_expected_tpt_g[IWL_RATE_COUNT] = {
+	0, 0, 76, 104, 130, 168, 191, 202, 7, 13, 35, 58
+};
+
+static s32 iwl_expected_tpt_g_prot[IWL_RATE_COUNT] = {
+	0, 0, 0, 80, 93, 113, 123, 125, 7, 13, 35, 58
+};
+
+static s32 iwl_expected_tpt_a[IWL_RATE_COUNT] = {
+	40, 57, 72, 98, 121, 154, 177, 186, 0, 0, 0, 0
+};
+
+static s32 iwl_expected_tpt_b[IWL_RATE_COUNT] = {
+	0, 0, 0, 0, 0, 0, 0, 0, 7, 13, 35, 58
+};
+
+struct iwl_tpt_entry {
+	s8 min_rssi;
+	u8 index;
+};
+
+static struct iwl_tpt_entry iwl_tpt_table_a[] = {
+	{-60, IWL_RATE_54M_INDEX},
+	{-64, IWL_RATE_48M_INDEX},
+	{-72, IWL_RATE_36M_INDEX},
+	{-80, IWL_RATE_24M_INDEX},
+	{-84, IWL_RATE_18M_INDEX},
+	{-85, IWL_RATE_12M_INDEX},
+	{-87, IWL_RATE_9M_INDEX},
+	{-89, IWL_RATE_6M_INDEX}
+};
+
+static struct iwl_tpt_entry iwl_tpt_table_b[] = {
+	{-86, IWL_RATE_11M_INDEX},
+	{-88, IWL_RATE_5M_INDEX},
+	{-90, IWL_RATE_2M_INDEX},
+	{-92, IWL_RATE_1M_INDEX}
+
+};
+
+static struct iwl_tpt_entry iwl_tpt_table_g[] = {
+	{-60, IWL_RATE_54M_INDEX},
+	{-64, IWL_RATE_48M_INDEX},
+	{-68, IWL_RATE_36M_INDEX},
+	{-80, IWL_RATE_24M_INDEX},
+	{-84, IWL_RATE_18M_INDEX},
+	{-85, IWL_RATE_12M_INDEX},
+	{-86, IWL_RATE_11M_INDEX},
+	{-88, IWL_RATE_5M_INDEX},
+	{-90, IWL_RATE_2M_INDEX},
+	{-92, IWL_RATE_1M_INDEX}
+};
+
+#define IWL_RATE_MAX_WINDOW          62
+#define IWL_RATE_FLUSH        (3*HZ/10)
+#define IWL_RATE_WIN_FLUSH       (HZ/2)
+#define IWL_RATE_HIGH_TH          11520
+#define IWL_RATE_MIN_FAILURE_TH       8
+#define IWL_RATE_MIN_SUCCESS_TH       8
+#define IWL_RATE_DECREASE_TH       1920
+
+static u8 iwl_get_rate_index_by_rssi(s32 rssi, u8 mode)
+{
+	u32 index = 0;
+	u32 table_size = 0;
+	struct iwl_tpt_entry *tpt_table = NULL;
+
+	if ((rssi < IWL_MIN_RSSI_VAL) || (rssi > IWL_MAX_RSSI_VAL))
+		rssi = IWL_MIN_RSSI_VAL;
+
+	switch (mode) {
+	case MODE_IEEE80211G:
+		tpt_table = iwl_tpt_table_g;
+		table_size = ARRAY_SIZE(iwl_tpt_table_g);
+		break;
+
+	case MODE_IEEE80211A:
+		tpt_table = iwl_tpt_table_a;
+		table_size = ARRAY_SIZE(iwl_tpt_table_a);
+		break;
+
+	default:
+	case MODE_IEEE80211B:
+		tpt_table = iwl_tpt_table_b;
+		table_size = ARRAY_SIZE(iwl_tpt_table_b);
+		break;
+	}
+
+	while ((index < table_size) && (rssi < tpt_table[index].min_rssi))
+		index++;
+
+	index = min(index, (table_size - 1));
+
+	return tpt_table[index].index;
+}
+
+static void iwl_clear_window(struct iwl_rate_scale_data *window)
+{
+	window->data = 0;
+	window->success_counter = 0;
+	window->success_ratio = IWL_INVALID_VALUE;
+	window->counter = 0;
+	window->average_tpt = IWL_INVALID_VALUE;
+	window->stamp = 0;
+}
+
+/**
+ * iwl_rate_scale_flush_windows - flush out the rate scale windows
+ *
+ * Returns the number of windows that have gathered data but were
+ * not flushed.  If there were any that were not flushed, then
+ * reschedule the rate flushing routine.
+ */
+static int iwl_rate_scale_flush_windows(struct iwl_rate_scale_priv *rs_priv)
+{
+	int unflushed = 0;
+	int i;
+	unsigned long flags;
+
+	/*
+	 * For each rate, if we have collected data on that rate
+	 * and it has been more than IWL_RATE_WIN_FLUSH
+	 * since we flushed, clear out the gathered statistics
+	 */
+	for (i = 0; i < IWL_RATE_COUNT; i++) {
+		if (!rs_priv->win[i].counter)
+			continue;
+
+		spin_lock_irqsave(&rs_priv->lock, flags);
+		if (time_after(jiffies, rs_priv->win[i].stamp +
+			       IWL_RATE_WIN_FLUSH)) {
+			IWL_DEBUG_RATE("flushing %d samples of rate "
+				       "index %d\n",
+				       rs_priv->win[i].counter, i);
+			iwl_clear_window(&rs_priv->win[i]);
+		} else
+			unflushed++;
+		spin_unlock_irqrestore(&rs_priv->lock, flags);
+	}
+
+	return unflushed;
+}
+
+#define IWL_RATE_FLUSH_MAX              5000	/* msec */
+#define IWL_RATE_FLUSH_MIN              50	/* msec */
+
+static void iwl_bg_rate_scale_flush(unsigned long data)
+{
+	struct iwl_rate_scale_priv *rs_priv = (void *)data;
+	int unflushed = 0;
+	unsigned long flags;
+	u32 packet_count, duration, pps;
+
+	IWL_DEBUG_RATE("enter\n");
+
+	unflushed = iwl_rate_scale_flush_windows(rs_priv);
+
+	spin_lock_irqsave(&rs_priv->lock, flags);
+
+	rs_priv->flush_pending = 0;
+
+	/* Number of packets Rx'd since last time this timer ran */
+	packet_count = (rs_priv->tx_packets - rs_priv->last_tx_packets) + 1;
+
+	rs_priv->last_tx_packets = rs_priv->tx_packets + 1;
+
+	if (unflushed) {
+		duration =
+		    jiffies_to_msecs(jiffies - rs_priv->last_partial_flush);
+/*              duration = jiffies_to_msecs(rs_priv->flush_time); */
+
+		IWL_DEBUG_RATE("Tx'd %d packets in %dms\n",
+			       packet_count, duration);
+
+		/* Determine packets per second */
+		if (duration)
+			pps = (packet_count * 1000) / duration;
+		else
+			pps = 0;
+
+		if (pps) {
+			duration = IWL_RATE_FLUSH_MAX / pps;
+			if (duration < IWL_RATE_FLUSH_MIN)
+				duration = IWL_RATE_FLUSH_MIN;
+		} else
+			duration = IWL_RATE_FLUSH_MAX;
+
+		rs_priv->flush_time = msecs_to_jiffies(duration);
+
+		IWL_DEBUG_RATE("new flush period: %d msec ave %d\n",
+			       duration, packet_count);
+
+		mod_timer(&rs_priv->rate_scale_flush, jiffies +
+			  rs_priv->flush_time);
+
+		rs_priv->last_partial_flush = jiffies;
+	}
+
+	/* If there weren't any unflushed entries, we don't schedule the timer
+	 * to run again */
+
+	rs_priv->last_flush = jiffies;
+
+	spin_unlock_irqrestore(&rs_priv->lock, flags);
+
+	IWL_DEBUG_RATE("leave\n");
+}
+
+/**
+ * iwl_collect_tx_data - Update the success/failure sliding window
+ *
+ * We keep a sliding window of the last 64 packets transmitted
+ * at this rate.  window->data contains the bitmask of successful
+ * packets.
+ */
+static void iwl_collect_tx_data(struct iwl_rate_scale_priv *rs_priv,
+				struct iwl_rate_scale_data *window,
+				int success, int retries)
+{
+	unsigned long flags;
+
+	if (!retries) {
+		IWL_DEBUG_RATE("leave: retries == 0 -- should be at least 1\n");
+		return;
+	}
+
+	while (retries--) {
+		spin_lock_irqsave(&rs_priv->lock, flags);
+
+		/* If we have filled up the window then subtract one from the
+		 * success counter if the high-bit is counting toward
+		 * success */
+		if (window->counter == IWL_RATE_MAX_WINDOW) {
+			if (window->data & (1ULL << (IWL_RATE_MAX_WINDOW - 1)))
+				window->success_counter--;
+		} else
+			window->counter++;
+
+		/* Slide the window to the left one bit */
+		window->data = (window->data << 1);
+
+		/* If this packet was a success then set the low bit high */
+		if (success) {
+			window->success_counter++;
+			window->data |= 1;
+		}
+
+		/* window->counter can't be 0 -- it is either >0 or
+		 * IWL_RATE_MAX_WINDOW */
+		window->success_ratio = 12800 * window->success_counter /
+		    window->counter;
+
+		/* Tag this window as having been updated */
+		window->stamp = jiffies;
+
+		spin_unlock_irqrestore(&rs_priv->lock, flags);
+	}
+}
+
+static void rs_rate_init(void *priv_rate, void *priv_sta,
+			 struct ieee80211_local *local, struct sta_info *sta)
+{
+	int i;
+
+	IWL_DEBUG_RATE("enter\n");
+
+	/* TODO: what is a good starting rate for STA? About middle? Maybe not
+	 * the lowest or the highest rate.. Could consider using RSSI from
+	 * previous packets? Need to have IEEE 802.1X auth succeed immediately
+	 * after assoc.. */
+
+	for (i = IWL_RATE_COUNT - 1; i >= 0; i--) {
+		if (sta->supp_rates & (1 << i)) {
+			sta->txrate = i;
+			break;
+		}
+	}
+
+	sta->last_txrate = sta->txrate;
+
+	IWL_DEBUG_RATE("leave\n");
+}
+
+static void *rs_alloc(struct ieee80211_local *local)
+{
+	return local->hw.priv;
+}
+
+/* rate scale requires free function to be implmented */
+static void rs_free(void *priv)
+{
+	return;
+}
+static void rs_clear(void *priv)
+{
+	return;
+}
+
+
+static void *rs_alloc_sta(void *priv, gfp_t gfp)
+{
+	struct iwl_rate_scale_priv *rs_priv;
+	int i;
+
+	IWL_DEBUG_RATE("enter\n");
+
+	rs_priv = kzalloc(sizeof(struct iwl_rate_scale_priv), gfp);
+	if (!rs_priv) {
+		IWL_DEBUG_RATE("leave: ENOMEM\n");
+		return NULL;
+	}
+
+	spin_lock_init(&rs_priv->lock);
+
+	rs_priv->start_rate = IWL_RATE_INVALID;
+
+	/* default to just 802.11b */
+	rs_priv->expected_tpt = iwl_expected_tpt_b;
+
+	rs_priv->last_partial_flush = jiffies;
+	rs_priv->last_flush = jiffies;
+	rs_priv->flush_time = IWL_RATE_FLUSH;
+	rs_priv->last_tx_packets = 0;
+	rs_priv->ibss_sta_added = 0;
+
+	init_timer(&rs_priv->rate_scale_flush);
+	rs_priv->rate_scale_flush.data = (unsigned long)rs_priv;
+	rs_priv->rate_scale_flush.function = &iwl_bg_rate_scale_flush;
+
+	for (i = 0; i < IWL_RATE_COUNT; i++)
+		iwl_clear_window(&rs_priv->win[i]);
+
+	IWL_DEBUG_RATE("leave\n");
+
+	return rs_priv;
+}
+
+static void rs_free_sta(void *priv, void *priv_sta)
+{
+	struct iwl_rate_scale_priv *rs_priv = priv_sta;
+
+	IWL_DEBUG_RATE("enter\n");
+	del_timer_sync(&rs_priv->rate_scale_flush);
+	kfree(rs_priv);
+	IWL_DEBUG_RATE("leave\n");
+}
+
+/**
+ * rs_tx_status - Update rate control values based on Tx results
+ *
+ * NOTE: Uses iwl_priv->retry_rate for the # of retries attempted by
+ * the hardware for each rate.
+ */
+static void rs_tx_status(void *priv_rate,
+			 struct net_device *dev,
+			 struct sk_buff *skb,
+			 struct ieee80211_tx_status *tx_resp)
+{
+	u8 retries, current_count;
+	int scale_rate_index, first_index, last_index;
+	unsigned long flags;
+	struct sta_info *sta;
+	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
+	struct iwl_priv *priv = (struct iwl_priv *)priv_rate;
+	struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
+	struct iwl_rate_scale_priv *rs_priv;
+
+	IWL_DEBUG_RATE("enter\n");
+
+	retries = tx_resp->retry_count;
+
+	first_index = tx_resp->control.tx_rate;
+	if ((first_index < 0) || (first_index >= IWL_RATE_COUNT)) {
+		IWL_DEBUG_RATE("leave: Rate out of bounds: %0x for %d\n",
+			       tx_resp->control.tx_rate, first_index);
+		return;
+	}
+
+	sta = sta_info_get(local, hdr->addr1);
+	if (!sta || !sta->rate_ctrl_priv) {
+		if (sta)
+			sta_info_put(sta);
+		IWL_DEBUG_RATE("leave: No STA priv data to update!\n");
+		return;
+	}
+
+	rs_priv = (void *)sta->rate_ctrl_priv;
+
+	rs_priv->tx_packets++;
+
+	scale_rate_index = first_index;
+	last_index = first_index;
+
+	/*
+	 * Update the window for each rate.  We determine which rates
+	 * were Tx'd based on the total number of retries vs. the number
+	 * of retries configured for each rate -- currently set to the
+	 * priv value 'retry_rate' vs. rate specific
+	 *
+	 * On exit from this while loop last_index indicates the rate
+	 * at which the frame was finally transmitted (or failed if no
+	 * ACK)
+	 */
+	while (retries > 0) {
+		if (retries < priv->retry_rate) {
+			current_count = retries;
+			last_index = scale_rate_index;
+		} else {
+			current_count = priv->retry_rate;
+			last_index = iwl_get_prev_ieee_rate(scale_rate_index);
+		}
+
+		/* Update this rate accounting for as many retries
+		 * as was used for it (per current_count) */
+		iwl_collect_tx_data(rs_priv,
+				    &rs_priv->win[scale_rate_index],
+				    0, current_count);
+		IWL_DEBUG_RATE("Update rate %d for %d retries.\n",
+			       scale_rate_index, current_count);
+
+		retries -= current_count;
+
+		if (retries)
+			scale_rate_index =
+			    iwl_get_prev_ieee_rate(scale_rate_index);
+	}
+
+	/* Update the last index window with success/failure based on ACK */
+	IWL_DEBUG_RATE("Update rate %d with %s.\n",
+		       last_index,
+		       (tx_resp->flags & IEEE80211_TX_STATUS_ACK) ?
+		       "success" : "failure");
+	iwl_collect_tx_data(rs_priv,
+			    &rs_priv->win[last_index],
+			    tx_resp->flags & IEEE80211_TX_STATUS_ACK, 1);
+
+	/* We updated the rate scale window -- if its been more than
+	 * flush_time since the last run, schedule the flush
+	 * again */
+	spin_lock_irqsave(&rs_priv->lock, flags);
+
+	if (!rs_priv->flush_pending &&
+	    time_after(jiffies, rs_priv->last_partial_flush +
+		       rs_priv->flush_time)) {
+
+		rs_priv->flush_pending = 1;
+		mod_timer(&rs_priv->rate_scale_flush,
+			  jiffies + rs_priv->flush_time);
+	}
+
+	spin_unlock_irqrestore(&rs_priv->lock, flags);
+
+	sta_info_put(sta);
+
+	IWL_DEBUG_RATE("leave\n");
+
+	return;
+}
+
+static struct ieee80211_rate *iwl_get_lowest_rate(struct ieee80211_local
+						  *local)
+{
+	struct ieee80211_hw_mode *mode = local->oper_hw_mode;
+	int i;
+
+	for (i = 0; i < mode->num_rates; i++) {
+		struct ieee80211_rate *rate = &mode->rates[i];
+
+		if (rate->flags & IEEE80211_RATE_SUPPORTED)
+			return rate;
+	}
+
+	return &mode->rates[0];
+}
+
+static u16 iwl_get_adjacent_rate(struct iwl_rate_scale_priv *rs_priv,
+				 u8 index, u16 rate_mask, int phymode)
+{
+	u8 high = IWL_RATE_INVALID;
+	u8 low = IWL_RATE_INVALID;
+
+	/* 802.11A walks to the next literal adjascent rate in
+	 * the rate table */
+	if (unlikely(phymode == MODE_IEEE80211A)) {
+		int i;
+		u32 mask;
+
+		/* Find the previous rate that is in the rate mask */
+		i = index - 1;
+		for (mask = (1 << i); i >= 0; i--, mask >>= 1) {
+			if (rate_mask & mask) {
+				low = i;
+				break;
+			}
+		}
+
+		/* Find the next rate that is in the rate mask */
+		i = index + 1;
+		for (mask = (1 << i); i < IWL_RATE_COUNT; i++, mask <<= 1) {
+			if (rate_mask & mask) {
+				high = i;
+				break;
+			}
+		}
+
+		return (high << 8) | low;
+	}
+
+	low = index;
+	while (low != IWL_RATE_INVALID) {
+		if (rs_priv->tgg)
+			low = iwl_rates[low].prev_rs_tgg;
+		else
+			low = iwl_rates[low].prev_rs;
+		if (low == IWL_RATE_INVALID)
+			break;
+		if (rate_mask & (1 << low))
+			break;
+		IWL_DEBUG_RATE("Skipping masked lower rate: %d\n", low);
+	}
+
+	high = index;
+	while (high != IWL_RATE_INVALID) {