ipw2100.c 225 KB
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/******************************************************************************

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  Copyright(c) 2003 - 2006 Intel Corporation. All rights reserved.
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  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., 59
  Temple Place - Suite 330, Boston, MA  02111-1307, 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

  Portions of this file are based on the sample_* files provided by Wireless
  Extensions 0.26 package and copyright (c) 1997-2003 Jean Tourrilhes
  <jt@hpl.hp.com>

  Portions of this file are based on the Host AP project,
  Copyright (c) 2001-2002, SSH Communications Security Corp and Jouni Malinen
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    <j@w1.fi>
  Copyright (c) 2002-2003, Jouni Malinen <j@w1.fi>
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  Portions of ipw2100_mod_firmware_load, ipw2100_do_mod_firmware_load, and
  ipw2100_fw_load are loosely based on drivers/sound/sound_firmware.c
  available in the 2.4.25 kernel sources, and are copyright (c) Alan Cox

******************************************************************************/
/*

 Initial driver on which this is based was developed by Janusz Gorycki,
 Maciej Urbaniak, and Maciej Sosnowski.

 Promiscuous mode support added by Jacek Wysoczynski and Maciej Urbaniak.

Theory of Operation

Tx - Commands and Data

Firmware and host share a circular queue of Transmit Buffer Descriptors (TBDs)
Each TBD contains a pointer to the physical (dma_addr_t) address of data being
sent to the firmware as well as the length of the data.

The host writes to the TBD queue at the WRITE index.  The WRITE index points
to the _next_ packet to be written and is advanced when after the TBD has been
filled.

The firmware pulls from the TBD queue at the READ index.  The READ index points
to the currently being read entry, and is advanced once the firmware is
done with a packet.

When data is sent to the firmware, the first TBD is used to indicate to the
firmware if a Command or Data is being sent.  If it is Command, all of the
command information is contained within the physical address referred to by the
TBD.  If it is Data, the first TBD indicates the type of data packet, number
of fragments, etc.  The next TBD then referrs to the actual packet location.

The Tx flow cycle is as follows:

1) ipw2100_tx() is called by kernel with SKB to transmit
2) Packet is move from the tx_free_list and appended to the transmit pending
   list (tx_pend_list)
3) work is scheduled to move pending packets into the shared circular queue.
4) when placing packet in the circular queue, the incoming SKB is DMA mapped
   to a physical address.  That address is entered into a TBD.  Two TBDs are
   filled out.  The first indicating a data packet, the second referring to the
   actual payload data.
5) the packet is removed from tx_pend_list and placed on the end of the
   firmware pending list (fw_pend_list)
6) firmware is notified that the WRITE index has
7) Once the firmware has processed the TBD, INTA is triggered.
8) For each Tx interrupt received from the firmware, the READ index is checked
   to see which TBDs are done being processed.
9) For each TBD that has been processed, the ISR pulls the oldest packet
   from the fw_pend_list.
10)The packet structure contained in the fw_pend_list is then used
   to unmap the DMA address and to free the SKB originally passed to the driver
   from the kernel.
11)The packet structure is placed onto the tx_free_list

The above steps are the same for commands, only the msg_free_list/msg_pend_list
are used instead of tx_free_list/tx_pend_list

...

Critical Sections / Locking :

There are two locks utilized.  The first is the low level lock (priv->low_lock)
that protects the following:

- Access to the Tx/Rx queue lists via priv->low_lock. The lists are as follows:

  tx_free_list : Holds pre-allocated Tx buffers.
    TAIL modified in __ipw2100_tx_process()
    HEAD modified in ipw2100_tx()

  tx_pend_list : Holds used Tx buffers waiting to go into the TBD ring
    TAIL modified ipw2100_tx()
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    HEAD modified by ipw2100_tx_send_data()
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  msg_free_list : Holds pre-allocated Msg (Command) buffers
    TAIL modified in __ipw2100_tx_process()
    HEAD modified in ipw2100_hw_send_command()

  msg_pend_list : Holds used Msg buffers waiting to go into the TBD ring
    TAIL modified in ipw2100_hw_send_command()
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    HEAD modified in ipw2100_tx_send_commands()
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  The flow of data on the TX side is as follows:

  MSG_FREE_LIST + COMMAND => MSG_PEND_LIST => TBD => MSG_FREE_LIST
  TX_FREE_LIST + DATA => TX_PEND_LIST => TBD => TX_FREE_LIST

  The methods that work on the TBD ring are protected via priv->low_lock.

- The internal data state of the device itself
- Access to the firmware read/write indexes for the BD queues
  and associated logic

All external entry functions are locked with the priv->action_lock to ensure
that only one external action is invoked at a time.


*/

#include <linux/compiler.h>
#include <linux/errno.h>
#include <linux/if_arp.h>
#include <linux/in6.h>
#include <linux/in.h>
#include <linux/ip.h>
#include <linux/kernel.h>
#include <linux/kmod.h>
#include <linux/module.h>
#include <linux/netdevice.h>
#include <linux/ethtool.h>
#include <linux/pci.h>
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#include <linux/dma-mapping.h>
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#include <linux/proc_fs.h>
#include <linux/skbuff.h>
#include <asm/uaccess.h>
#include <asm/io.h>
#include <linux/fs.h>
#include <linux/mm.h>
#include <linux/slab.h>
#include <linux/unistd.h>
#include <linux/stringify.h>
#include <linux/tcp.h>
#include <linux/types.h>
#include <linux/version.h>
#include <linux/time.h>
#include <linux/firmware.h>
#include <linux/acpi.h>
#include <linux/ctype.h>
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#include <linux/latency.h>
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#include "ipw2100.h"

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#define IPW2100_VERSION "git-1.2.2"
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#define DRV_NAME	"ipw2100"
#define DRV_VERSION	IPW2100_VERSION
#define DRV_DESCRIPTION	"Intel(R) PRO/Wireless 2100 Network Driver"
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#define DRV_COPYRIGHT	"Copyright(c) 2003-2006 Intel Corporation"
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/* Debugging stuff */
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#ifdef CONFIG_IPW2100_DEBUG
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#define IPW2100_RX_DEBUG	/* Reception debugging */
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#endif

MODULE_DESCRIPTION(DRV_DESCRIPTION);
MODULE_VERSION(DRV_VERSION);
MODULE_AUTHOR(DRV_COPYRIGHT);
MODULE_LICENSE("GPL");

static int debug = 0;
static int mode = 0;
static int channel = 0;
static int associate = 1;
static int disable = 0;
#ifdef CONFIG_PM
static struct ipw2100_fw ipw2100_firmware;
#endif

#include <linux/moduleparam.h>
module_param(debug, int, 0444);
module_param(mode, int, 0444);
module_param(channel, int, 0444);
module_param(associate, int, 0444);
module_param(disable, int, 0444);

MODULE_PARM_DESC(debug, "debug level");
MODULE_PARM_DESC(mode, "network mode (0=BSS,1=IBSS,2=Monitor)");
MODULE_PARM_DESC(channel, "channel");
MODULE_PARM_DESC(associate, "auto associate when scanning (default on)");
MODULE_PARM_DESC(disable, "manually disable the radio (default 0 [radio on])");

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static u32 ipw2100_debug_level = IPW_DL_NONE;

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#ifdef CONFIG_IPW2100_DEBUG
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#define IPW_DEBUG(level, message...) \
do { \
	if (ipw2100_debug_level & (level)) { \
		printk(KERN_DEBUG "ipw2100: %c %s ", \
                       in_interrupt() ? 'I' : 'U',  __FUNCTION__); \
		printk(message); \
	} \
} while (0)
#else
#define IPW_DEBUG(level, message...) do {} while (0)
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#endif				/* CONFIG_IPW2100_DEBUG */
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#ifdef CONFIG_IPW2100_DEBUG
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static const char *command_types[] = {
	"undefined",
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	"unused",		/* HOST_ATTENTION */
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	"HOST_COMPLETE",
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	"unused",		/* SLEEP */
	"unused",		/* HOST_POWER_DOWN */
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	"unused",
	"SYSTEM_CONFIG",
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	"unused",		/* SET_IMR */
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	"SSID",
	"MANDATORY_BSSID",
	"AUTHENTICATION_TYPE",
	"ADAPTER_ADDRESS",
	"PORT_TYPE",
	"INTERNATIONAL_MODE",
	"CHANNEL",
	"RTS_THRESHOLD",
	"FRAG_THRESHOLD",
	"POWER_MODE",
	"TX_RATES",
	"BASIC_TX_RATES",
	"WEP_KEY_INFO",
	"unused",
	"unused",
	"unused",
	"unused",
	"WEP_KEY_INDEX",
	"WEP_FLAGS",
	"ADD_MULTICAST",
	"CLEAR_ALL_MULTICAST",
	"BEACON_INTERVAL",
	"ATIM_WINDOW",
	"CLEAR_STATISTICS",
	"undefined",
	"undefined",
	"undefined",
	"undefined",
	"TX_POWER_INDEX",
	"undefined",
	"undefined",
	"undefined",
	"undefined",
	"undefined",
	"undefined",
	"BROADCAST_SCAN",
	"CARD_DISABLE",
	"PREFERRED_BSSID",
	"SET_SCAN_OPTIONS",
	"SCAN_DWELL_TIME",
	"SWEEP_TABLE",
	"AP_OR_STATION_TABLE",
	"GROUP_ORDINALS",
	"SHORT_RETRY_LIMIT",
	"LONG_RETRY_LIMIT",
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	"unused",		/* SAVE_CALIBRATION */
	"unused",		/* RESTORE_CALIBRATION */
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	"undefined",
	"undefined",
	"undefined",
	"HOST_PRE_POWER_DOWN",
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	"unused",		/* HOST_INTERRUPT_COALESCING */
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	"undefined",
	"CARD_DISABLE_PHY_OFF",
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	"MSDU_TX_RATES" "undefined",
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	"undefined",
	"SET_STATION_STAT_BITS",
	"CLEAR_STATIONS_STAT_BITS",
	"LEAP_ROGUE_MODE",
	"SET_SECURITY_INFORMATION",
	"DISASSOCIATION_BSSID",
	"SET_WPA_ASS_IE"
};
#endif

/* Pre-decl until we get the code solid and then we can clean it up */
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static void ipw2100_tx_send_commands(struct ipw2100_priv *priv);
static void ipw2100_tx_send_data(struct ipw2100_priv *priv);
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static int ipw2100_adapter_setup(struct ipw2100_priv *priv);

static void ipw2100_queues_initialize(struct ipw2100_priv *priv);
static void ipw2100_queues_free(struct ipw2100_priv *priv);
static int ipw2100_queues_allocate(struct ipw2100_priv *priv);

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static int ipw2100_fw_download(struct ipw2100_priv *priv,
			       struct ipw2100_fw *fw);
static int ipw2100_get_firmware(struct ipw2100_priv *priv,
				struct ipw2100_fw *fw);
static int ipw2100_get_fwversion(struct ipw2100_priv *priv, char *buf,
				 size_t max);
static int ipw2100_get_ucodeversion(struct ipw2100_priv *priv, char *buf,
				    size_t max);
static void ipw2100_release_firmware(struct ipw2100_priv *priv,
				     struct ipw2100_fw *fw);
static int ipw2100_ucode_download(struct ipw2100_priv *priv,
				  struct ipw2100_fw *fw);
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static void ipw2100_wx_event_work(struct work_struct *work);
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static struct iw_statistics *ipw2100_wx_wireless_stats(struct net_device *dev);
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static struct iw_handler_def ipw2100_wx_handler_def;

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static inline void read_register(struct net_device *dev, u32 reg, u32 * val)
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{
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	*val = readl((void __iomem *)(dev->base_addr + reg));
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	IPW_DEBUG_IO("r: 0x%08X => 0x%08X\n", reg, *val);
}

static inline void write_register(struct net_device *dev, u32 reg, u32 val)
{
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	writel(val, (void __iomem *)(dev->base_addr + reg));
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	IPW_DEBUG_IO("w: 0x%08X <= 0x%08X\n", reg, val);
}

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static inline void read_register_word(struct net_device *dev, u32 reg,
				      u16 * val)
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{
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	*val = readw((void __iomem *)(dev->base_addr + reg));
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	IPW_DEBUG_IO("r: 0x%08X => %04X\n", reg, *val);
}

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static inline void read_register_byte(struct net_device *dev, u32 reg, u8 * val)
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{
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	*val = readb((void __iomem *)(dev->base_addr + reg));
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	IPW_DEBUG_IO("r: 0x%08X => %02X\n", reg, *val);
}

static inline void write_register_word(struct net_device *dev, u32 reg, u16 val)
{
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	writew(val, (void __iomem *)(dev->base_addr + reg));
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	IPW_DEBUG_IO("w: 0x%08X <= %04X\n", reg, val);
}

static inline void write_register_byte(struct net_device *dev, u32 reg, u8 val)
{
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	writeb(val, (void __iomem *)(dev->base_addr + reg));
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	IPW_DEBUG_IO("w: 0x%08X =< %02X\n", reg, val);
}

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static inline void read_nic_dword(struct net_device *dev, u32 addr, u32 * val)
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{
	write_register(dev, IPW_REG_INDIRECT_ACCESS_ADDRESS,
		       addr & IPW_REG_INDIRECT_ADDR_MASK);
	read_register(dev, IPW_REG_INDIRECT_ACCESS_DATA, val);
}

static inline void write_nic_dword(struct net_device *dev, u32 addr, u32 val)
{
	write_register(dev, IPW_REG_INDIRECT_ACCESS_ADDRESS,
		       addr & IPW_REG_INDIRECT_ADDR_MASK);
	write_register(dev, IPW_REG_INDIRECT_ACCESS_DATA, val);
}

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static inline void read_nic_word(struct net_device *dev, u32 addr, u16 * val)
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{
	write_register(dev, IPW_REG_INDIRECT_ACCESS_ADDRESS,
		       addr & IPW_REG_INDIRECT_ADDR_MASK);
	read_register_word(dev, IPW_REG_INDIRECT_ACCESS_DATA, val);
}

static inline void write_nic_word(struct net_device *dev, u32 addr, u16 val)
{
	write_register(dev, IPW_REG_INDIRECT_ACCESS_ADDRESS,
		       addr & IPW_REG_INDIRECT_ADDR_MASK);
	write_register_word(dev, IPW_REG_INDIRECT_ACCESS_DATA, val);
}

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static inline void read_nic_byte(struct net_device *dev, u32 addr, u8 * val)
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{
	write_register(dev, IPW_REG_INDIRECT_ACCESS_ADDRESS,
		       addr & IPW_REG_INDIRECT_ADDR_MASK);
	read_register_byte(dev, IPW_REG_INDIRECT_ACCESS_DATA, val);
}

static inline void write_nic_byte(struct net_device *dev, u32 addr, u8 val)
{
	write_register(dev, IPW_REG_INDIRECT_ACCESS_ADDRESS,
		       addr & IPW_REG_INDIRECT_ADDR_MASK);
	write_register_byte(dev, IPW_REG_INDIRECT_ACCESS_DATA, val);
}

static inline void write_nic_auto_inc_address(struct net_device *dev, u32 addr)
{
	write_register(dev, IPW_REG_AUTOINCREMENT_ADDRESS,
		       addr & IPW_REG_INDIRECT_ADDR_MASK);
}

static inline void write_nic_dword_auto_inc(struct net_device *dev, u32 val)
{
	write_register(dev, IPW_REG_AUTOINCREMENT_DATA, val);
}

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static void write_nic_memory(struct net_device *dev, u32 addr, u32 len,
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				    const u8 * buf)
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{
	u32 aligned_addr;
	u32 aligned_len;
	u32 dif_len;
	u32 i;

	/* read first nibble byte by byte */
	aligned_addr = addr & (~0x3);
	dif_len = addr - aligned_addr;
	if (dif_len) {
		/* Start reading at aligned_addr + dif_len */
		write_register(dev, IPW_REG_INDIRECT_ACCESS_ADDRESS,
			       aligned_addr);
		for (i = dif_len; i < 4; i++, buf++)
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			write_register_byte(dev,
					    IPW_REG_INDIRECT_ACCESS_DATA + i,
					    *buf);
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		len -= dif_len;
		aligned_addr += 4;
	}

	/* read DWs through autoincrement registers */
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	write_register(dev, IPW_REG_AUTOINCREMENT_ADDRESS, aligned_addr);
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	aligned_len = len & (~0x3);
	for (i = 0; i < aligned_len; i += 4, buf += 4, aligned_addr += 4)
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		write_register(dev, IPW_REG_AUTOINCREMENT_DATA, *(u32 *) buf);
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	/* copy the last nibble */
	dif_len = len - aligned_len;
	write_register(dev, IPW_REG_INDIRECT_ACCESS_ADDRESS, aligned_addr);
	for (i = 0; i < dif_len; i++, buf++)
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		write_register_byte(dev, IPW_REG_INDIRECT_ACCESS_DATA + i,
				    *buf);
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}

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static void read_nic_memory(struct net_device *dev, u32 addr, u32 len,
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				   u8 * buf)
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{
	u32 aligned_addr;
	u32 aligned_len;
	u32 dif_len;
	u32 i;

	/* read first nibble byte by byte */
	aligned_addr = addr & (~0x3);
	dif_len = addr - aligned_addr;
	if (dif_len) {
		/* Start reading at aligned_addr + dif_len */
		write_register(dev, IPW_REG_INDIRECT_ACCESS_ADDRESS,
			       aligned_addr);
		for (i = dif_len; i < 4; i++, buf++)
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			read_register_byte(dev,
					   IPW_REG_INDIRECT_ACCESS_DATA + i,
					   buf);
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		len -= dif_len;
		aligned_addr += 4;
	}

	/* read DWs through autoincrement registers */
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	write_register(dev, IPW_REG_AUTOINCREMENT_ADDRESS, aligned_addr);
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	aligned_len = len & (~0x3);
	for (i = 0; i < aligned_len; i += 4, buf += 4, aligned_addr += 4)
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		read_register(dev, IPW_REG_AUTOINCREMENT_DATA, (u32 *) buf);
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	/* copy the last nibble */
	dif_len = len - aligned_len;
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	write_register(dev, IPW_REG_INDIRECT_ACCESS_ADDRESS, aligned_addr);
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	for (i = 0; i < dif_len; i++, buf++)
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		read_register_byte(dev, IPW_REG_INDIRECT_ACCESS_DATA + i, buf);
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}

static inline int ipw2100_hw_is_adapter_in_system(struct net_device *dev)
{
	return (dev->base_addr &&
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		(readl
		 ((void __iomem *)(dev->base_addr +
				   IPW_REG_DOA_DEBUG_AREA_START))
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		 == IPW_DATA_DOA_DEBUG_VALUE));
}

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static int ipw2100_get_ordinal(struct ipw2100_priv *priv, u32 ord,
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			       void *val, u32 * len)
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{
	struct ipw2100_ordinals *ordinals = &priv->ordinals;
	u32 addr;
	u32 field_info;
	u16 field_len;
	u16 field_count;
	u32 total_length;

	if (ordinals->table1_addr == 0) {
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		printk(KERN_WARNING DRV_NAME ": attempt to use fw ordinals "
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		       "before they have been loaded.\n");
		return -EINVAL;
	}

	if (IS_ORDINAL_TABLE_ONE(ordinals, ord)) {
		if (*len < IPW_ORD_TAB_1_ENTRY_SIZE) {
			*len = IPW_ORD_TAB_1_ENTRY_SIZE;

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			printk(KERN_WARNING DRV_NAME
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			       ": ordinal buffer length too small, need %zd\n",
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			       IPW_ORD_TAB_1_ENTRY_SIZE);

			return -EINVAL;
		}

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		read_nic_dword(priv->net_dev,
			       ordinals->table1_addr + (ord << 2), &addr);
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		read_nic_dword(priv->net_dev, addr, val);

		*len = IPW_ORD_TAB_1_ENTRY_SIZE;

		return 0;
	}

	if (IS_ORDINAL_TABLE_TWO(ordinals, ord)) {

		ord -= IPW_START_ORD_TAB_2;

		/* get the address of statistic */
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		read_nic_dword(priv->net_dev,
			       ordinals->table2_addr + (ord << 3), &addr);
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		/* get the second DW of statistics ;
		 * two 16-bit words - first is length, second is count */
		read_nic_dword(priv->net_dev,
			       ordinals->table2_addr + (ord << 3) + sizeof(u32),
			       &field_info);

		/* get each entry length */
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		field_len = *((u16 *) & field_info);
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		/* get number of entries */
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		field_count = *(((u16 *) & field_info) + 1);
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		/* abort if no enought memory */
		total_length = field_len * field_count;
		if (total_length > *len) {
			*len = total_length;
			return -EINVAL;
		}

		*len = total_length;
		if (!total_length)
			return 0;

		/* read the ordinal data from the SRAM */
		read_nic_memory(priv->net_dev, addr, total_length, val);

		return 0;
	}

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	printk(KERN_WARNING DRV_NAME ": ordinal %d neither in table 1 nor "
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	       "in table 2\n", ord);

	return -EINVAL;
}

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static int ipw2100_set_ordinal(struct ipw2100_priv *priv, u32 ord, u32 * val,
			       u32 * len)
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{
	struct ipw2100_ordinals *ordinals = &priv->ordinals;
	u32 addr;

	if (IS_ORDINAL_TABLE_ONE(ordinals, ord)) {
		if (*len != IPW_ORD_TAB_1_ENTRY_SIZE) {
			*len = IPW_ORD_TAB_1_ENTRY_SIZE;
			IPW_DEBUG_INFO("wrong size\n");
			return -EINVAL;
		}

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		read_nic_dword(priv->net_dev,
			       ordinals->table1_addr + (ord << 2), &addr);
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		write_nic_dword(priv->net_dev, addr, *val);

		*len = IPW_ORD_TAB_1_ENTRY_SIZE;

		return 0;
	}

	IPW_DEBUG_INFO("wrong table\n");
	if (IS_ORDINAL_TABLE_TWO(ordinals, ord))
		return -EINVAL;

	return -EINVAL;
}

static char *snprint_line(char *buf, size_t count,
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			  const u8 * data, u32 len, u32 ofs)
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{
	int out, i, j, l;
	char c;

	out = snprintf(buf, count, "%08X", ofs);

	for (l = 0, i = 0; i < 2; i++) {
		out += snprintf(buf + out, count - out, " ");
		for (j = 0; j < 8 && l < len; j++, l++)
			out += snprintf(buf + out, count - out, "%02X ",
					data[(i * 8 + j)]);
		for (; j < 8; j++)
			out += snprintf(buf + out, count - out, "   ");
	}

	out += snprintf(buf + out, count - out, " ");
	for (l = 0, i = 0; i < 2; i++) {
		out += snprintf(buf + out, count - out, " ");
		for (j = 0; j < 8 && l < len; j++, l++) {
			c = data[(i * 8 + j)];
			if (!isascii(c) || !isprint(c))
				c = '.';

			out += snprintf(buf + out, count - out, "%c", c);
		}

		for (; j < 8; j++)
			out += snprintf(buf + out, count - out, " ");
	}

	return buf;
}

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static void printk_buf(int level, const u8 * data, u32 len)
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{
	char line[81];
	u32 ofs = 0;
	if (!(ipw2100_debug_level & level))
		return;

	while (len) {
		printk(KERN_DEBUG "%s\n",
		       snprint_line(line, sizeof(line), &data[ofs],
				    min(len, 16U), ofs));
		ofs += 16;
		len -= min(len, 16U);
	}
}

#define MAX_RESET_BACKOFF 10

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static void schedule_reset(struct ipw2100_priv *priv)
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{
	unsigned long now = get_seconds();

	/* If we haven't received a reset request within the backoff period,
	 * then we can reset the backoff interval so this reset occurs
	 * immediately */
	if (priv->reset_backoff &&
	    (now - priv->last_reset > priv->reset_backoff))
		priv->reset_backoff = 0;

	priv->last_reset = get_seconds();

	if (!(priv->status & STATUS_RESET_PENDING)) {
		IPW_DEBUG_INFO("%s: Scheduling firmware restart (%ds).\n",
			       priv->net_dev->name, priv->reset_backoff);
		netif_carrier_off(priv->net_dev);
		netif_stop_queue(priv->net_dev);
		priv->status |= STATUS_RESET_PENDING;
		if (priv->reset_backoff)
			queue_delayed_work(priv->workqueue, &priv->reset_work,
					   priv->reset_backoff * HZ);
		else
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			queue_delayed_work(priv->workqueue, &priv->reset_work,
					   0);
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		if (priv->reset_backoff < MAX_RESET_BACKOFF)
			priv->reset_backoff++;

		wake_up_interruptible(&priv->wait_command_queue);
	} else
		IPW_DEBUG_INFO("%s: Firmware restart already in progress.\n",
			       priv->net_dev->name);

}

#define HOST_COMPLETE_TIMEOUT (2 * HZ)
static int ipw2100_hw_send_command(struct ipw2100_priv *priv,
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				   struct host_command *cmd)
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{
	struct list_head *element;
	struct ipw2100_tx_packet *packet;
	unsigned long flags;
	int err = 0;

	IPW_DEBUG_HC("Sending %s command (#%d), %d bytes\n",
		     command_types[cmd->host_command], cmd->host_command,
		     cmd->host_command_length);
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	printk_buf(IPW_DL_HC, (u8 *) cmd->host_command_parameters,
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		   cmd->host_command_length);

	spin_lock_irqsave(&priv->low_lock, flags);

	if (priv->fatal_error) {
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		IPW_DEBUG_INFO
		    ("Attempt to send command while hardware in fatal error condition.\n");
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		err = -EIO;
		goto fail_unlock;
	}

	if (!(priv->status & STATUS_RUNNING)) {
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		IPW_DEBUG_INFO
		    ("Attempt to send command while hardware is not running.\n");
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		err = -EIO;
		goto fail_unlock;
	}

	if (priv->status & STATUS_CMD_ACTIVE) {
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		IPW_DEBUG_INFO
		    ("Attempt to send command while another command is pending.\n");
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		err = -EBUSY;
		goto fail_unlock;
	}

	if (list_empty(&priv->msg_free_list)) {
		IPW_DEBUG_INFO("no available msg buffers\n");
		goto fail_unlock;
	}

	priv->status |= STATUS_CMD_ACTIVE;
	priv->messages_sent++;

	element = priv->msg_free_list.next;

	packet = list_entry(element, struct ipw2100_tx_packet, list);
	packet->jiffy_start = jiffies;

	/* initialize the firmware command packet */
	packet->info.c_struct.cmd->host_command_reg = cmd->host_command;
	packet->info.c_struct.cmd->host_command_reg1 = cmd->host_command1;
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	packet->info.c_struct.cmd->host_command_len_reg =
	    cmd->host_command_length;
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	packet->info.c_struct.cmd->sequence = cmd->host_command_sequence;

	memcpy(packet->info.c_struct.cmd->host_command_params_reg,
	       cmd->host_command_parameters,
	       sizeof(packet->info.c_struct.cmd->host_command_params_reg));

	list_del(element);
	DEC_STAT(&priv->msg_free_stat);

	list_add_tail(element, &priv->msg_pend_list);
	INC_STAT(&priv->msg_pend_stat);

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	ipw2100_tx_send_commands(priv);
	ipw2100_tx_send_data(priv);
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	spin_unlock_irqrestore(&priv->low_lock, flags);

	/*
	 * We must wait for this command to complete before another
	 * command can be sent...  but if we wait more than 3 seconds
	 * then there is a problem.
	 */

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	err =
	    wait_event_interruptible_timeout(priv->wait_command_queue,
					     !(priv->
					       status & STATUS_CMD_ACTIVE),
					     HOST_COMPLETE_TIMEOUT);
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	if (err == 0) {
		IPW_DEBUG_INFO("Command completion failed out after %dms.\n",
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			       1000 * (HOST_COMPLETE_TIMEOUT / HZ));
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		priv->fatal_error = IPW2100_ERR_MSG_TIMEOUT;
		priv->status &= ~STATUS_CMD_ACTIVE;
		schedule_reset(priv);
		return -EIO;
	}

	if (priv->fatal_error) {
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		printk(KERN_WARNING DRV_NAME ": %s: firmware fatal error\n",
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		       priv->net_dev->name);
		return -EIO;
	}

	/* !!!!! HACK TEST !!!!!
	 * When lots of debug trace statements are enabled, the driver
	 * doesn't seem to have as many firmware restart cycles...
	 *
	 * As a test, we're sticking in a 1/100s delay here */
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	schedule_timeout_uninterruptible(msecs_to_jiffies(10));
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	return 0;

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      fail_unlock:
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	spin_unlock_irqrestore(&priv->low_lock, flags);

	return err;
}

/*
 * Verify the values and data access of the hardware
 * No locks needed or used.  No functions called.
 */
static int ipw2100_verify(struct ipw2100_priv *priv)
{
	u32 data1, data2;
	u32 address;

	u32 val1 = 0x76543210;
	u32 val2 = 0xFEDCBA98;

	/* Domain 0 check - all values should be DOA_DEBUG */
	for (address = IPW_REG_DOA_DEBUG_AREA_START;
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		read_register(priv->net_dev, address, &data1);
		if (data1 != IPW_DATA_DOA_DEBUG_VALUE)
			return -EIO;
	}

	/* Domain 1 check - use arbitrary read/write compare  */
	for (address = 0; address < 5; address++) {
		/* The memory area is not used now */
		write_register(priv->net_dev, IPW_REG_DOMAIN_1_OFFSET + 0x32,
			       val1);
		write_register(priv->net_dev, IPW_REG_DOMAIN_1_OFFSET + 0x36,
			       val2);
		read_register(priv->net_dev, IPW_REG_DOMAIN_1_OFFSET + 0x32,
			      &data1);
		read_register(priv->net_dev, IPW_REG_DOMAIN_1_OFFSET + 0x36,
			      &data2);
		if (val1 == data1 && val2 == data2)
			return 0;
	}

	return -EIO;
}

/*
 *
 * Loop until the CARD_DISABLED bit is the same value as the
 * supplied parameter
 *
 * TODO: See if it would be more efficient to do a wait/wake
 *       cycle and have the completion event trigger the wakeup
 *
 */
#define IPW_CARD_DISABLE_COMPLETE_WAIT		    100	// 100 milli
static int ipw2100_wait_for_card_state(struct ipw2100_priv *priv, int state)
{
	int i;
	u32 card_state;
	u32 len = sizeof(card_state);
	int err;

	for (i = 0; i <= IPW_CARD_DISABLE_COMPLETE_WAIT * 1000; i += 50) {
		err = ipw2100_get_ordinal(priv, IPW_ORD_CARD_DISABLED,
					  &card_state, &len);
		if (err) {
			IPW_DEBUG_INFO("Query of CARD_DISABLED ordinal "
				       "failed.\n");
			return 0;
		}

		/* We'll break out if either the HW state says it is
		 * in the state we want, or if HOST_COMPLETE command
		 * finishes */
		if ((card_state == state) ||
		    ((priv->status & STATUS_ENABLED) ?
		     IPW_HW_STATE_ENABLED : IPW_HW_STATE_DISABLED) == state) {
			if (state == IPW_HW_STATE_ENABLED)
				priv->status |= STATUS_ENABLED;
			else
				priv->status &= ~STATUS_ENABLED;

			return 0;
		}

		udelay(50);
	}

	IPW_DEBUG_INFO("ipw2100_wait_for_card_state to %s state timed out\n",
		       state ? "DISABLED" : "ENABLED");
	return -EIO;
}

/*********************************************************************
    Procedure   :   sw_reset_and_clock
    Purpose     :   Asserts s/w reset, asserts clock initialization
                    and waits for clock stabilization
 ********************************************************************/
static int sw_reset_and_clock(struct ipw2100_priv *priv)
{
	int i;
	u32 r;

	// assert s/w reset
	write_register(priv->net_dev, IPW_REG_RESET_REG,
		       IPW_AUX_HOST_RESET_REG_SW_RESET);

	// wait for clock stabilization
	for (i = 0; i < 1000; i++) {
		udelay(IPW_WAIT_RESET_ARC_COMPLETE_DELAY);

		// check clock ready bit
		read_register(priv->net_dev, IPW_REG_RESET_REG, &r);
		if (r & IPW_AUX_HOST_RESET_REG_PRINCETON_RESET)
			break;
	}

	if (i == 1000)
		return -EIO;	// TODO: better error value

	/* set "initialization complete" bit to move adapter to
	 * D0 state */
	write_register(priv->net_dev, IPW_REG_GP_CNTRL,
		       IPW_AUX_HOST_GP_CNTRL_BIT_INIT_DONE);

	/* wait for clock stabilization */
	for (i = 0; i < 10000; i++) {
		udelay(IPW_WAIT_CLOCK_STABILIZATION_DELAY * 4);

		/* check clock ready bit */
		read_register(priv->net_dev, IPW_REG_GP_CNTRL, &r);
		if (r & IPW_AUX_HOST_GP_CNTRL_BIT_CLOCK_READY)
			break;
	}

	if (i == 10000)
		return -EIO;	/* TODO: better error value */

	/* set D0 standby bit */
	read_register(priv->net_dev, IPW_REG_GP_CNTRL, &r);
	write_register(priv->net_dev, IPW_REG_GP_CNTRL,
		       r | IPW_AUX_HOST_GP_CNTRL_BIT_HOST_ALLOWS_STANDBY);

	return 0;
}

/*********************************************************************
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    Procedure   :   ipw2100_download_firmware
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    Purpose     :   Initiaze adapter after power on.
                    The sequence is:
                    1. assert s/w reset first!
                    2. awake clocks & wait for clock stabilization
                    3. hold ARC (don't ask me why...)
                    4. load Dino ucode and reset/clock init again
                    5. zero-out shared mem
                    6. download f/w
 *******************************************************************/
static int ipw2100_download_firmware(struct ipw2100_priv *priv)
{
	u32 address;
	int err;

#ifndef CONFIG_PM
	/* Fetch the firmware and microcode */
	struct ipw2100_fw ipw2100_firmware;
#endif

	if (priv->fatal_error) {
		IPW_DEBUG_ERROR("%s: ipw2100_download_firmware called after "
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				priv->net_dev->name, priv->fatal_error);
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		return -EINVAL;
	}
#ifdef CONFIG_PM
	if (!ipw2100_firmware.version) {
		err = ipw2100_get_firmware(priv, &ipw2100_firmware);
		if (err) {
			IPW_DEBUG_ERROR("%s: ipw2100_get_firmware failed: %d\n",
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			priv->fatal_error = IPW2100_ERR_FW_LOAD;
			goto fail;
		}
	}
#else
	err = ipw2100_get_firmware(priv, &ipw2100_firmware);
	if (err) {
		IPW_DEBUG_ERROR("%s: ipw2100_get_firmware failed: %d\n",
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				priv->net_dev->name, err);
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		priv->fatal_error = IPW2100_ERR_FW_LOAD;
		goto fail;
	}
#endif
	priv->firmware_version = ipw2100_firmware.version;

	/* s/w reset and clock stabilization */
	err = sw_reset_and_clock(priv);
	if (err) {
		IPW_DEBUG_ERROR("%s: sw_reset_and_clock failed: %d\n",
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