/*
 * Host AP (software wireless LAN access point) driver for
 * Intersil Prism2/2.5/3.
 *
 * Copyright (c) 2001-2002, SSH Communications Security Corp and Jouni Malinen
 * <j@w1.fi>
 * Copyright (c) 2002-2005, Jouni Malinen <j@w1.fi>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation. See README and COPYING for
 * more details.
 *
 * FIX:
 * - there is currently no way of associating TX packets to correct wds device
 *   when TX Exc/OK event occurs, so all tx_packets and some
 *   tx_errors/tx_dropped are added to the main netdevice; using sw_support
 *   field in txdesc might be used to fix this (using Alloc event to increment
 *   tx_packets would need some further info in txfid table)
 *
 * Buffer Access Path (BAP) usage:
 *   Prism2 cards have two separate BAPs for accessing the card memory. These
 *   should allow concurrent access to two different frames and the driver
 *   previously used BAP0 for sending data and BAP1 for receiving data.
 *   However, there seems to be number of issues with concurrent access and at
 *   least one know hardware bug in using BAP0 and BAP1 concurrently with PCI
 *   Prism2.5. Therefore, the driver now only uses BAP0 for moving data between
 *   host and card memories. BAP0 accesses are protected with local->baplock
 *   (spin_lock_bh) to prevent concurrent use.
 */



#include <asm/delay.h>
#include <linux/uaccess.h>

#include <linux/slab.h>
#include <linux/netdevice.h>
#include <linux/etherdevice.h>
#include <linux/proc_fs.h>
#include <linux/seq_file.h>
#include <linux/if_arp.h>
#include <linux/delay.h>
#include <linux/random.h>
#include <linux/wait.h>
#include <linux/sched/signal.h>
#include <linux/rtnetlink.h>
#include <linux/wireless.h>
#include <net/iw_handler.h>
#include <net/lib80211.h>
#include <asm/irq.h>

#include "hostap_80211.h"
#include "hostap.h"
#include "hostap_ap.h"


/* #define final_version */

static int mtu = 1500;
module_param(mtu, int, 0444);
MODULE_PARM_DESC(mtu, "Maximum transfer unit");

static int channel[MAX_PARM_DEVICES] = { 3, DEF_INTS };
module_param_array(channel, int, NULL, 0444);
MODULE_PARM_DESC(channel, "Initial channel");

static char essid[33] = "test";
module_param_string(essid, essid, sizeof(essid), 0444);
MODULE_PARM_DESC(essid, "Host AP's ESSID");

static int iw_mode[MAX_PARM_DEVICES] = { IW_MODE_MASTER, DEF_INTS };
module_param_array(iw_mode, int, NULL, 0444);
MODULE_PARM_DESC(iw_mode, "Initial operation mode");

static int beacon_int[MAX_PARM_DEVICES] = { 100, DEF_INTS };
module_param_array(beacon_int, int, NULL, 0444);
MODULE_PARM_DESC(beacon_int, "Beacon interval (1 = 1024 usec)");

static int dtim_period[MAX_PARM_DEVICES] = { 1, DEF_INTS };
module_param_array(dtim_period, int, NULL, 0444);
MODULE_PARM_DESC(dtim_period, "DTIM period");

static char dev_template[16] = "wlan%d";
module_param_string(dev_template, dev_template, sizeof(dev_template), 0444);
MODULE_PARM_DESC(dev_template, "Prefix for network device name (default: "
                 "wlan%d)");

#ifdef final_version
#define EXTRA_EVENTS_WTERR 0
#else
/* check WTERR events (Wait Time-out) in development versions */
#define EXTRA_EVENTS_WTERR HFA384X_EV_WTERR
#endif

/* Events that will be using BAP0 */
#define HFA384X_BAP0_EVENTS \
        (HFA384X_EV_TXEXC | HFA384X_EV_RX | HFA384X_EV_INFO | HFA384X_EV_TX)

/* event mask, i.e., events that will result in an interrupt */
#define HFA384X_EVENT_MASK \
        (HFA384X_BAP0_EVENTS | HFA384X_EV_ALLOC | HFA384X_EV_INFDROP | \
        HFA384X_EV_CMD | HFA384X_EV_TICK | \
        EXTRA_EVENTS_WTERR)

/* Default TX control flags: use 802.11 headers and request interrupt for
 * failed transmits. Frames that request ACK callback, will add
 * _TX_OK flag and _ALT_RTRY flag may be used to select different retry policy.
 */
#define HFA384X_TX_CTRL_FLAGS \
        (HFA384X_TX_CTRL_802_11 | HFA384X_TX_CTRL_TX_EX)


/* ca. 1 usec */
#define HFA384X_CMD_BUSY_TIMEOUT 5000
#define HFA384X_BAP_BUSY_TIMEOUT 50000

/* ca. 10 usec */
#define HFA384X_CMD_COMPL_TIMEOUT 20000
#define HFA384X_DL_COMPL_TIMEOUT 1000000

/* Wait times for initialization; yield to other processes to avoid busy
 * waiting for long time. */
#define HFA384X_INIT_TIMEOUT (HZ / 2) /* 500 ms */
#define HFA384X_ALLOC_COMPL_TIMEOUT (HZ / 20) /* 50 ms */


static void prism2_hw_reset(struct net_device *dev);
static void prism2_check_sta_fw_version(local_info_t *local);

#ifdef PRISM2_DOWNLOAD_SUPPORT
/* hostap_download.c */
static const struct file_operations prism2_download_aux_dump_proc_fops;
static u8 * prism2_read_pda(struct net_device *dev);
static int prism2_download(local_info_t *local,
                           struct prism2_download_param *param);
static void prism2_download_free_data(struct prism2_download_data *dl);
static int prism2_download_volatile(local_info_t *local,
                                    struct prism2_download_data *param);
static int prism2_download_genesis(local_info_t *local,
                                   struct prism2_download_data *param);
static int prism2_get_ram_size(local_info_t *local);
#endif /* PRISM2_DOWNLOAD_SUPPORT */




#ifndef final_version
/* magic value written to SWSUPPORT0 reg. for detecting whether card is still
 * present */
#define HFA384X_MAGIC 0x8A32
#endif


static u16 hfa384x_read_reg(struct net_device *dev, u16 reg)
{
        return HFA384X_INW(reg);
}


static void hfa384x_read_regs(struct net_device *dev,
                              struct hfa384x_regs *regs)
{
        regs->cmd = HFA384X_INW(HFA384X_CMD_OFF);
        regs->evstat = HFA384X_INW(HFA384X_EVSTAT_OFF);
        regs->offset0 = HFA384X_INW(HFA384X_OFFSET0_OFF);
        regs->offset1 = HFA384X_INW(HFA384X_OFFSET1_OFF);
        regs->swsupport0 = HFA384X_INW(HFA384X_SWSUPPORT0_OFF);
}


/**
 * __hostap_cmd_queue_free - Free Prism2 command queue entry (private)
 * @local: pointer to private Host AP driver data
 * @entry: Prism2 command queue entry to be freed
 * @del_req: request the entry to be removed
 *
 * Internal helper function for freeing Prism2 command queue entries.
 * Caller must have acquired local->cmdlock before calling this function.
 */
static inline void __hostap_cmd_queue_free(local_info_t *local,
                                           struct hostap_cmd_queue *entry,
                                           int del_req)
{
        if (del_req) {
                entry->del_req = 1;
                if (!list_empty(&entry->list)) {
                        list_del_init(&entry->list);
                        local->cmd_queue_len--;
                }
        }

        if (refcount_dec_and_test(&entry->usecnt) && entry->del_req)
                kfree(entry);
}


/**
 * hostap_cmd_queue_free - Free Prism2 command queue entry
 * @local: pointer to private Host AP driver data
 * @entry: Prism2 command queue entry to be freed
 * @del_req: request the entry to be removed
 *
 * Free a Prism2 command queue entry.
 */
static inline void hostap_cmd_queue_free(local_info_t *local,
                                         struct hostap_cmd_queue *entry,
                                         int del_req)
{
        unsigned long flags;

        spin_lock_irqsave(&local->cmdlock, flags);
        __hostap_cmd_queue_free(local, entry, del_req);
        spin_unlock_irqrestore(&local->cmdlock, flags);
}


/**
 * prism2_clear_cmd_queue - Free all pending Prism2 command queue entries
 * @local: pointer to private Host AP driver data
 */
static void prism2_clear_cmd_queue(local_info_t *local)
{
        struct list_head *ptr, *n;
        unsigned long flags;
        struct hostap_cmd_queue *entry;

        spin_lock_irqsave(&local->cmdlock, flags);
        list_for_each_safe(ptr, n, &local->cmd_queue) {
                entry = list_entry(ptr, struct hostap_cmd_queue, list);
                refcount_inc(&entry->usecnt);
                printk(KERN_DEBUG "%s: removed pending cmd_queue entry "
                       "(type=%d, cmd=0x%04x, param0=0x%04x)\n",
                       local->dev->name, entry->type, entry->cmd,
                       entry->param0);
                __hostap_cmd_queue_free(local, entry, 1);
        }
        if (local->cmd_queue_len) {
                /* This should not happen; print debug message and clear
                 * queue length. */
                printk(KERN_DEBUG "%s: cmd_queue_len (%d) not zero after "
                       "flush\n", local->dev->name, local->cmd_queue_len);
                local->cmd_queue_len = 0;
        }
        spin_unlock_irqrestore(&local->cmdlock, flags);
}


/**
 * hfa384x_cmd_issue - Issue a Prism2 command to the hardware
 * @dev: pointer to net_device
 * @entry: Prism2 command queue entry to be issued
 */
static int hfa384x_cmd_issue(struct net_device *dev,
                                    struct hostap_cmd_queue *entry)
{
        struct hostap_interface *iface;
        local_info_t *local;
        int tries;
        u16 reg;
        unsigned long flags;

        iface = netdev_priv(dev);
        local = iface->local;

        if (local->func->card_present && !local->func->card_present(local))
                return -ENODEV;

        if (entry->issued) {
                printk(KERN_DEBUG "%s: driver bug - re-issuing command @%p\n",
                       dev->name, entry);
        }

        /* wait until busy bit is clear; this should always be clear since the
         * commands are serialized */
        tries = HFA384X_CMD_BUSY_TIMEOUT;
        while (HFA384X_INW(HFA384X_CMD_OFF) & HFA384X_CMD_BUSY && tries > 0) {
                tries--;
                udelay(1);
        }
#ifndef final_version
        if (tries != HFA384X_CMD_BUSY_TIMEOUT) {
                prism2_io_debug_error(dev, 1);
                printk(KERN_DEBUG "%s: hfa384x_cmd_issue: cmd reg was busy "
                       "for %d usec\n", dev->name,
                       HFA384X_CMD_BUSY_TIMEOUT - tries);
        }
#endif
        if (tries == 0) {
                reg = HFA384X_INW(HFA384X_CMD_OFF);
                prism2_io_debug_error(dev, 2);
                printk(KERN_DEBUG "%s: hfa384x_cmd_issue - timeout - "
                       "reg=0x%04x\n", dev->name, reg);
                return -ETIMEDOUT;
        }

        /* write command */
        spin_lock_irqsave(&local->cmdlock, flags);
        HFA384X_OUTW(entry->param0, HFA384X_PARAM0_OFF);
        HFA384X_OUTW(entry->param1, HFA384X_PARAM1_OFF);
        HFA384X_OUTW(entry->cmd, HFA384X_CMD_OFF);
        entry->issued = 1;
        spin_unlock_irqrestore(&local->cmdlock, flags);

        return 0;
}


/**
 * hfa384x_cmd - Issue a Prism2 command and wait (sleep) for completion
 * @dev: pointer to net_device
 * @cmd: Prism2 command code (HFA384X_CMD_CODE_*)
 * @param0: value for Param0 register
 * @param1: value for Param1 register (pointer; %NULL if not used)
 * @resp0: pointer for Resp0 data or %NULL if Resp0 is not needed
 *
 * Issue given command (possibly after waiting in command queue) and sleep
 * until the command is completed (or timed out or interrupted). This can be
 * called only from user process context.
 */
static int hfa384x_cmd(struct net_device *dev, u16 cmd, u16 param0,
                       u16 *param1, u16 *resp0)
{
        struct hostap_interface *iface;
        local_info_t *local;
        int err, res, issue, issued = 0;
        unsigned long flags;
        struct hostap_cmd_queue *entry;
        DECLARE_WAITQUEUE(wait, current);

        iface = netdev_priv(dev);
        local = iface->local;

        if (in_interrupt()) {
                printk(KERN_DEBUG "%s: hfa384x_cmd called from interrupt "
                       "context\n", dev->name);
                return -1;
        }

        if (local->cmd_queue_len >= HOSTAP_CMD_QUEUE_MAX_LEN) {
                printk(KERN_DEBUG "%s: hfa384x_cmd: cmd_queue full\n",
                       dev->name);
                return -1;
        }

        if (signal_pending(current))
                return -EINTR;

        entry = kzalloc(sizeof(*entry), GFP_ATOMIC);
        if (entry == NULL)
                return -ENOMEM;

        refcount_set(&entry->usecnt, 1);
        entry->type = CMD_SLEEP;
        entry->cmd = cmd;
        entry->param0 = param0;
        if (param1)
                entry->param1 = *param1;
        init_waitqueue_head(&entry->compl);

        /* prepare to wait for command completion event, but do not sleep yet
         */
        add_wait_queue(&entry->compl, &wait);
        set_current_state(TASK_INTERRUPTIBLE);

        spin_lock_irqsave(&local->cmdlock, flags);
        issue = list_empty(&local->cmd_queue);
        if (issue)
                entry->issuing = 1;
        list_add_tail(&entry->list, &local->cmd_queue);
        local->cmd_queue_len++;
        spin_unlock_irqrestore(&local->cmdlock, flags);

        err = 0;
        if (!issue)
                goto wait_completion;

        if (signal_pending(current))
                err = -EINTR;

        if (!err) {
                if (hfa384x_cmd_issue(dev, entry))
                        err = -ETIMEDOUT;
                else
                        issued = 1;
        }

 wait_completion:
        if (!err && entry->type != CMD_COMPLETED) {
                /* sleep until command is completed or timed out */
                res = schedule_timeout(2 * HZ);
        } else
                res = -1;

        if (!err && signal_pending(current))
                err = -EINTR;

        if (err && issued) {
                /* the command was issued, so a CmdCompl event should occur
                 * soon; however, there's a pending signal and
                 * schedule_timeout() would be interrupted; wait a short period
                 * of time to avoid removing entry from the list before
                 * CmdCompl event */
                udelay(300);
        }

        set_current_state(TASK_RUNNING);
        remove_wait_queue(&entry->compl, &wait);

        /* If entry->list is still in the list, it must be removed
         * first and in this case prism2_cmd_ev() does not yet have
         * local reference to it, and the data can be kfree()'d
         * here. If the command completion event is still generated,
         * it will be assigned to next (possibly) pending command, but
         * the driver will reset the card anyway due to timeout
         *
         * If the entry is not in the list prism2_cmd_ev() has a local
         * reference to it, but keeps cmdlock as long as the data is
         * needed, so the data can be kfree()'d here. */

        /* FIX: if the entry->list is in the list, it has not been completed
         * yet, so removing it here is somewhat wrong.. this could cause
         * references to freed memory and next list_del() causing NULL pointer
         * dereference.. it would probably be better to leave the entry in the
         * list and the list should be emptied during hw reset */

        spin_lock_irqsave(&local->cmdlock, flags);
        if (!list_empty(&entry->list)) {
                printk(KERN_DEBUG "%s: hfa384x_cmd: entry still in list? "
                       "(entry=%p, type=%d, res=%d)\n", dev->name, entry,
                       entry->type, res);
                list_del_init(&entry->list);
                local->cmd_queue_len--;
        }
        spin_unlock_irqrestore(&local->cmdlock, flags);

        if (err) {
                printk(KERN_DEBUG "%s: hfa384x_cmd: interrupted; err=%d\n",
                       dev->name, err);
                res = err;
                goto done;
        }

        if (entry->type != CMD_COMPLETED) {
                u16 reg = HFA384X_INW(HFA384X_EVSTAT_OFF);
                printk(KERN_DEBUG "%s: hfa384x_cmd: command was not "
                       "completed (res=%d, entry=%p, type=%d, cmd=0x%04x, "
                       "param0=0x%04x, EVSTAT=%04x INTEN=%04x)\n", dev->name,
                       res, entry, entry->type, entry->cmd, entry->param0, reg,
                       HFA384X_INW(HFA384X_INTEN_OFF));
                if (reg & HFA384X_EV_CMD) {
                        /* Command completion event is pending, but the
                         * interrupt was not delivered - probably an issue
                         * with pcmcia-cs configuration. */
                        printk(KERN_WARNING "%s: interrupt delivery does not "
                               "seem to work\n", dev->name);
                }
                prism2_io_debug_error(dev, 3);
                res = -ETIMEDOUT;
                goto done;
        }

        if (resp0 != NULL)
                *resp0 = entry->resp0;
#ifndef final_version
        if (entry->res) {
                printk(KERN_DEBUG "%s: CMD=0x%04x => res=0x%02x, "
                       "resp0=0x%04x\n",
                       dev->name, cmd, entry->res, entry->resp0);
        }
#endif /* final_version */

        res = entry->res;
 done:
        hostap_cmd_queue_free(local, entry, 1);
        return res;
}


/**
 * hfa384x_cmd_callback - Issue a Prism2 command; callback when completed
 * @dev: pointer to net_device
 * @cmd: Prism2 command code (HFA384X_CMD_CODE_*)
 * @param0: value for Param0 register
 * @callback: command completion callback function (%NULL = no callback)
 * @context: context data to be given to the callback function
 *
 * Issue given command (possibly after waiting in command queue) and use
 * callback function to indicate command completion. This can be called both
 * from user and interrupt context. The callback function will be called in
 * hardware IRQ context. It can be %NULL, when no function is called when
 * command is completed.
 */
static int hfa384x_cmd_callback(struct net_device *dev, u16 cmd, u16 param0,
                                void (*callback)(struct net_device *dev,
                                                 long context, u16 resp0,
                                                 u16 status),
                                long context)
{
        struct hostap_interface *iface;
        local_info_t *local;
        int issue, ret;
        unsigned long flags;
        struct hostap_cmd_queue *entry;

        iface = netdev_priv(dev);
        local = iface->local;

        if (local->cmd_queue_len >= HOSTAP_CMD_QUEUE_MAX_LEN + 2) {
                printk(KERN_DEBUG "%s: hfa384x_cmd: cmd_queue full\n",
                       dev->name);
                return -1;
        }

        entry = kzalloc(sizeof(*entry), GFP_ATOMIC);
        if (entry == NULL)
                return -ENOMEM;

        refcount_set(&entry->usecnt, 1);
        entry->type = CMD_CALLBACK;
        entry->cmd = cmd;
        entry->param0 = param0;
        entry->callback = callback;
        entry->context = context;

        spin_lock_irqsave(&local->cmdlock, flags);
        issue = list_empty(&local->cmd_queue);
        if (issue)
                entry->issuing = 1;
        list_add_tail(&entry->list, &local->cmd_queue);
        local->cmd_queue_len++;
        spin_unlock_irqrestore(&local->cmdlock, flags);

        if (issue && hfa384x_cmd_issue(dev, entry))
                ret = -ETIMEDOUT;
        else
                ret = 0;

        hostap_cmd_queue_free(local, entry, ret);

        return ret;
}


/**
 * __hfa384x_cmd_no_wait - Issue a Prism2 command (private)
 * @dev: pointer to net_device
 * @cmd: Prism2 command code (HFA384X_CMD_CODE_*)
 * @param0: value for Param0 register
 * @io_debug_num: I/O debug error number
 *
 * Shared helper function for hfa384x_cmd_wait() and hfa384x_cmd_no_wait().
 */
static int __hfa384x_cmd_no_wait(struct net_device *dev, u16 cmd, u16 param0,
                                 int io_debug_num)
{
        int tries;
        u16 reg;

        /* wait until busy bit is clear; this should always be clear since the
         * commands are serialized */
        tries = HFA384X_CMD_BUSY_TIMEOUT;
        while (HFA384X_INW(HFA384X_CMD_OFF) & HFA384X_CMD_BUSY && tries > 0) {
                tries--;
                udelay(1);
        }
        if (tries == 0) {
                reg = HFA384X_INW(HFA384X_CMD_OFF);
                prism2_io_debug_error(dev, io_debug_num);
                printk(KERN_DEBUG "%s: __hfa384x_cmd_no_wait(%d) - timeout - "
                       "reg=0x%04x\n", dev->name, io_debug_num, reg);
                return -ETIMEDOUT;
        }

        /* write command */
        HFA384X_OUTW(param0, HFA384X_PARAM0_OFF);
        HFA384X_OUTW(cmd, HFA384X_CMD_OFF);

        return 0;
}


/**
 * hfa384x_cmd_wait - Issue a Prism2 command and busy wait for completion
 * @dev: pointer to net_device
 * @cmd: Prism2 command code (HFA384X_CMD_CODE_*)
 * @param0: value for Param0 register
 */
static int hfa384x_cmd_wait(struct net_device *dev, u16 cmd, u16 param0)
{
        int res, tries;
        u16 reg;

        res = __hfa384x_cmd_no_wait(dev, cmd, param0, 4);
        if (res)
                return res;

        /* wait for command completion */
        if ((cmd & HFA384X_CMDCODE_MASK) == HFA384X_CMDCODE_DOWNLOAD)
                tries = HFA384X_DL_COMPL_TIMEOUT;
        else
                tries = HFA384X_CMD_COMPL_TIMEOUT;

        while (!(HFA384X_INW(HFA384X_EVSTAT_OFF) & HFA384X_EV_CMD) &&
               tries > 0) {
                tries--;
                udelay(10);
        }
        if (tries == 0) {
                reg = HFA384X_INW(HFA384X_EVSTAT_OFF);
                prism2_io_debug_error(dev, 5);
                printk(KERN_DEBUG "%s: hfa384x_cmd_wait - timeout2 - "
                       "reg=0x%04x\n", dev->name, reg);
                return -ETIMEDOUT;
        }

        res = (HFA384X_INW(HFA384X_STATUS_OFF) &
               (BIT(14) | BIT(13) | BIT(12) | BIT(11) | BIT(10) | BIT(9) |
                BIT(8))) >> 8;
#ifndef final_version
        if (res) {
                printk(KERN_DEBUG "%s: CMD=0x%04x => res=0x%02x\n",
                       dev->name, cmd, res);
        }
#endif

        HFA384X_OUTW(HFA384X_EV_CMD, HFA384X_EVACK_OFF);

        return res;
}


/**
 * hfa384x_cmd_no_wait - Issue a Prism2 command; do not wait for completion
 * @dev: pointer to net_device
 * @cmd: Prism2 command code (HFA384X_CMD_CODE_*)
 * @param0: value for Param0 register
 */
static inline int hfa384x_cmd_no_wait(struct net_device *dev, u16 cmd,
                                      u16 param0)
{
        return __hfa384x_cmd_no_wait(dev, cmd, param0, 6);
}


/**
 * prism2_cmd_ev - Prism2 command completion event handler
 * @dev: pointer to net_device
 *
 * Interrupt handler for command completion events. Called by the main
 * interrupt handler in hardware IRQ context. Read Resp0 and status registers
 * from the hardware and ACK the event. Depending on the issued command type
 * either wake up the sleeping process that is waiting for command completion
 * or call the callback function. Issue the next command, if one is pending.
 */
static void prism2_cmd_ev(struct net_device *dev)
{
        struct hostap_interface *iface;
        local_info_t *local;
        struct hostap_cmd_queue *entry = NULL;

        iface = netdev_priv(dev);
        local = iface->local;

        spin_lock(&local->cmdlock);
        if (!list_empty(&local->cmd_queue)) {
                entry = list_entry(local->cmd_queue.next,
                                   struct hostap_cmd_queue, list);
                refcount_inc(&entry->usecnt);
                list_del_init(&entry->list);
                local->cmd_queue_len--;

                if (!entry->issued) {
                        printk(KERN_DEBUG "%s: Command completion event, but "
                               "cmd not issued\n", dev->name);
                        __hostap_cmd_queue_free(local, entry, 1);
                        entry = NULL;
                }
        }
        spin_unlock(&local->cmdlock);

        if (!entry) {
                HFA384X_OUTW(HFA384X_EV_CMD, HFA384X_EVACK_OFF);
                printk(KERN_DEBUG "%s: Command completion event, but no "
                       "pending commands\n", dev->name);
                return;
        }

        entry->resp0 = HFA384X_INW(HFA384X_RESP0_OFF);
        entry->res = (HFA384X_INW(HFA384X_STATUS_OFF) &
                      (BIT(14) | BIT(13) | BIT(12) | BIT(11) | BIT(10) |
                       BIT(9) | BIT(8))) >> 8;
        HFA384X_OUTW(HFA384X_EV_CMD, HFA384X_EVACK_OFF);

        /* TODO: rest of the CmdEv handling could be moved to tasklet */
        if (entry->type == CMD_SLEEP) {
                entry->type = CMD_COMPLETED;
                wake_up_interruptible(&entry->compl);
        } else if (entry->type == CMD_CALLBACK) {
                if (entry->callback)
                        entry->callback(dev, entry->context, entry->resp0,
                                        entry->res);
        } else {
                printk(KERN_DEBUG "%s: Invalid command completion type %d\n",
                       dev->name, entry->type);
        }
        hostap_cmd_queue_free(local, entry, 1);

        /* issue next command, if pending */
        entry = NULL;
        spin_lock(&local->cmdlock);
        if (!list_empty(&local->cmd_queue)) {
                entry = list_entry(local->cmd_queue.next,
                                   struct hostap_cmd_queue, list);
                if (entry->issuing) {
                        /* hfa384x_cmd() has already started issuing this
                         * command, so do not start here */
                        entry = NULL;
                }
                if (entry)
                        refcount_inc(&entry->usecnt);
        }
        spin_unlock(&local->cmdlock);

        if (entry) {
                /* issue next command; if command issuing fails, remove the
                 * entry from cmd_queue */
                int res = hfa384x_cmd_issue(dev, entry);
                spin_lock(&local->cmdlock);
                __hostap_cmd_queue_free(local, entry, res);
                spin_unlock(&local->cmdlock);
        }
}


static int hfa384x_wait_offset(struct net_device *dev, u16 o_off)
{
        int tries = HFA384X_BAP_BUSY_TIMEOUT;
        int res = HFA384X_INW(o_off) & HFA384X_OFFSET_BUSY;

        while (res && tries > 0) {
                tries--;
                udelay(1);
                res = HFA384X_INW(o_off) & HFA384X_OFFSET_BUSY;
        }
        return res;
}


/* Offset must be even */
static int hfa384x_setup_bap(struct net_device *dev, u16 bap, u16 id,
                             int offset)
{
        u16 o_off, s_off;
        int ret = 0;

        if (offset % 2 || bap > 1)
                return -EINVAL;

        if (bap == BAP1) {
                o_off = HFA384X_OFFSET1_OFF;
                s_off = HFA384X_SELECT1_OFF;
        } else {
                o_off = HFA384X_OFFSET0_OFF;
                s_off = HFA384X_SELECT0_OFF;
        }

        if (hfa384x_wait_offset(dev, o_off)) {
                prism2_io_debug_error(dev, 7);
                printk(KERN_DEBUG "%s: hfa384x_setup_bap - timeout before\n",
                       dev->name);
                ret = -ETIMEDOUT;
                goto out;
        }

        HFA384X_OUTW(id, s_off);
        HFA384X_OUTW(offset, o_off);

        if (hfa384x_wait_offset(dev, o_off)) {
                prism2_io_debug_error(dev, 8);
                printk(KERN_DEBUG "%s: hfa384x_setup_bap - timeout after\n",
                       dev->name);
                ret = -ETIMEDOUT;
                goto out;
        }
#ifndef final_version
        if (HFA384X_INW(o_off) & HFA384X_OFFSET_ERR) {
                prism2_io_debug_error(dev, 9);
                printk(KERN_DEBUG "%s: hfa384x_setup_bap - offset error "
                       "(%d,0x04%x,%d); reg=0x%04x\n",
                       dev->name, bap, id, offset, HFA384X_INW(o_off));
                ret = -EINVAL;
        }
#endif

 out:
        return ret;
}


static int hfa384x_get_rid(struct net_device *dev, u16 rid, void *buf, int len,
                           int exact_len)
{
        struct hostap_interface *iface;
        local_info_t *local;
        int res, rlen = 0;
        struct hfa384x_rid_hdr rec;

        iface = netdev_priv(dev);
        local = iface->local;

        if (local->no_pri) {
                printk(KERN_DEBUG "%s: cannot get RID %04x (len=%d) - no PRI "
                       "f/w\n", dev->name, rid, len);
                return -ENOTTY; /* Well.. not really correct, but return
                                 * something unique enough.. */
        }

        if ((local->func->card_present && !local->func->card_present(local)) ||
            local->hw_downloading)
                return -ENODEV;

        res = mutex_lock_interruptible(&local->rid_bap_mtx);
        if (res)
                return res;

        res = hfa384x_cmd(dev, HFA384X_CMDCODE_ACCESS, rid, NULL, NULL);
        if (res) {
                printk(KERN_DEBUG "%s: hfa384x_get_rid: CMDCODE_ACCESS failed "
                       "(res=%d, rid=%04x, len=%d)\n",
                       dev->name, res, rid, len);
                mutex_unlock(&local->rid_bap_mtx);
                return res;
        }

        spin_lock_bh(&local->baplock);

        res = hfa384x_setup_bap(dev, BAP0, rid, 0);
        if (res)
                goto unlock;

        res = hfa384x_from_bap(dev, BAP0, &rec, sizeof(rec));
        if (res)
                goto unlock;

        if (le16_to_cpu(rec.len) == 0) {
                /* RID not available */
                res = -ENODATA;
                goto unlock;
        }

        rlen = (le16_to_cpu(rec.len) - 1) * 2;
        if (exact_len && rlen != len) {
                printk(KERN_DEBUG "%s: hfa384x_get_rid - RID len mismatch: "
                       "rid=0x%04x, len=%d (expected %d)\n",
                       dev->name, rid, rlen, len);
                res = -ENODATA;
        }

        res = hfa384x_from_bap(dev, BAP0, buf, len);

unlock:
        spin_unlock_bh(&local->baplock);
        mutex_unlock(&local->rid_bap_mtx);

        if (res) {
                if (res != -ENODATA)
                        printk(KERN_DEBUG "%s: hfa384x_get_rid (rid=%04x, "
                               "len=%d) - failed - res=%d\n", dev->name, rid,
                               len, res);
                if (res == -ETIMEDOUT)
                        prism2_hw_reset(dev);
                return res;
        }

        return rlen;
}


static int hfa384x_set_rid(struct net_device *dev, u16 rid, void *buf, int len)
{
        struct hostap_interface *iface;
        local_info_t *local;
        struct hfa384x_rid_hdr rec;
        int res;

        iface = netdev_priv(dev);
        local = iface->local;

        if (local->no_pri) {
                printk(KERN_DEBUG "%s: cannot set RID %04x (len=%d) - no PRI "
                       "f/w\n", dev->name, rid, len);
                return -ENOTTY; /* Well.. not really correct, but return
                                 * something unique enough.. */
        }

        if ((local->func->card_present && !local->func->card_present(local)) ||
            local->hw_downloading)
                return -ENODEV;

        rec.rid = cpu_to_le16(rid);
        /* RID len in words and +1 for rec.rid */
        rec.len = cpu_to_le16(len / 2 + len % 2 + 1);

        res = mutex_lock_interruptible(&local->rid_bap_mtx);
        if (res)
                return res;

        spin_lock_bh(&local->baplock);
        res = hfa384x_setup_bap(dev, BAP0, rid, 0);
        if (!res)
                res = hfa384x_to_bap(dev, BAP0, &rec, sizeof(rec));
        if (!res)
                res = hfa384x_to_bap(dev, BAP0, buf, len);
        spin_unlock_bh(&local->baplock);

        if (res) {
                printk(KERN_DEBUG "%s: hfa384x_set_rid (rid=%04x, len=%d) - "
                       "failed - res=%d\n", dev->name, rid, len, res);
                mutex_unlock(&local->rid_bap_mtx);
                return res;
        }

        res = hfa384x_cmd(dev, HFA384X_CMDCODE_ACCESS_WRITE, rid, NULL, NULL);
        mutex_unlock(&local->rid_bap_mtx);

        if (res) {
                printk(KERN_DEBUG "%s: hfa384x_set_rid: CMDCODE_ACCESS_WRITE "
                       "failed (res=%d, rid=%04x, len=%d)\n",
                       dev->name, res, rid, len);

                if (res == -ETIMEDOUT)
                        prism2_hw_reset(dev);
        }

        return res;
}


static void hfa384x_disable_interrupts(struct net_device *dev)
{
        /* disable interrupts and clear event status */
        HFA384X_OUTW(0, HFA384X_INTEN_OFF);
        HFA384X_OUTW(0xffff, HFA384X_EVACK_OFF);
}


static void hfa384x_enable_interrupts(struct net_device *dev)
{
        /* ack pending events and enable interrupts from selected events */
        HFA384X_OUTW(0xffff, HFA384X_EVACK_OFF);
        HFA384X_OUTW(HFA384X_EVENT_MASK, HFA384X_INTEN_OFF);
}


static void hfa384x_events_no_bap0(struct net_device *dev)
{
        HFA384X_OUTW(HFA384X_EVENT_MASK & ~HFA384X_BAP0_EVENTS,
                     HFA384X_INTEN_OFF);
}


static void hfa384x_events_all(struct net_device *dev)
{
        HFA384X_OUTW(HFA384X_EVENT_MASK, HFA384X_INTEN_OFF);
}


static void hfa384x_events_only_cmd(struct net_device *dev)
{
        HFA384X_OUTW(HFA384X_EV_CMD, HFA384X_INTEN_OFF);
}


static u16 hfa384x_allocate_fid(struct net_device *dev, int len)
{
        u16 fid;
        unsigned long delay;

        /* FIX: this could be replace with hfa384x_cmd() if the Alloc event
         * below would be handled like CmdCompl event (sleep here, wake up from
         * interrupt handler */
        if (hfa384x_cmd_wait(dev, HFA384X_CMDCODE_ALLOC, len)) {
                printk(KERN_DEBUG "%s: cannot allocate fid, len=%d\n",
                       dev->name, len);
                return 0xffff;
        }

        delay = jiffies + HFA384X_ALLOC_COMPL_TIMEOUT;
        while (!(HFA384X_INW(HFA384X_EVSTAT_OFF) & HFA384X_EV_ALLOC) &&
               time_before(jiffies, delay))
                yield();
        if (!(HFA384X_INW(HFA384X_EVSTAT_OFF) & HFA384X_EV_ALLOC)) {
                printk("%s: fid allocate, len=%d - timeout\n", dev->name, len);
                return 0xffff;
        }

        fid = HFA384X_INW(HFA384X_ALLOCFID_OFF);
        HFA384X_OUTW(HFA384X_EV_ALLOC, HFA384X_EVACK_OFF);

        return fid;
}


static int prism2_reset_port(struct net_device *dev)
{
        struct hostap_interface *iface;
        local_info_t *local;
        int res;

        iface = netdev_priv(dev);
        local = iface->local;

        if (!local->dev_enabled)
                return 0;

        res = hfa384x_cmd(dev, HFA384X_CMDCODE_DISABLE, 0,
                          NULL, NULL);
        if (res)
                printk(KERN_DEBUG "%s: reset port failed to disable port\n",
                       dev->name);
        else {
                res = hfa384x_cmd(dev, HFA384X_CMDCODE_ENABLE, 0,
                                  NULL, NULL);
                if (res)
                        printk(KERN_DEBUG "%s: reset port failed to enable "
                               "port\n", dev->name);
        }

        /* It looks like at least some STA firmware versions reset
         * fragmentation threshold back to 2346 after enable command. Restore
         * the configured value, if it differs from this default. */
        if (local->fragm_threshold != 2346 &&
            hostap_set_word(dev, HFA384X_RID_FRAGMENTATIONTHRESHOLD,
                            local->fragm_threshold)) {
                printk(KERN_DEBUG "%s: failed to restore fragmentation "
                       "threshold (%d) after Port0 enable\n",
                       dev->name, local->fragm_threshold);
        }

        /* Some firmwares lose antenna selection settings on reset */
        (void) hostap_set_antsel(local);

        return res;
}


static int prism2_get_version_info(struct net_device *dev, u16 rid,
                                   const char *txt)
{
        struct hfa384x_comp_ident comp;
        struct hostap_interface *iface;
        local_info_t *local;

        iface = netdev_priv(dev);
        local = iface->local;

        if (local->no_pri) {
                /* PRI f/w not yet available - cannot read RIDs */
                return -1;
        }
        if (hfa384x_get_rid(dev, rid, &comp, sizeof(comp), 1) < 0) {
                printk(KERN_DEBUG "Could not get RID for component %s\n", txt);
                return -1;
        }

        printk(KERN_INFO "%s: %s: id=0x%02x v%d.%d.%d\n", dev->name, txt,
               __le16_to_cpu(comp.id), __le16_to_cpu(comp.major),
               __le16_to_cpu(comp.minor), __le16_to_cpu(comp.variant));
        return 0;
}


static int prism2_setup_rids(struct net_device *dev)
{
        struct hostap_interface *iface;
        local_info_t *local;
        __le16 tmp;
        int ret = 0;

        iface = netdev_priv(dev);
        local = iface->local;

        hostap_set_word(dev, HFA384X_RID_TICKTIME, 2000);

        if (!local->fw_ap) {
                u16 tmp1 = hostap_get_porttype(local);
                ret = hostap_set_word(dev, HFA384X_RID_CNFPORTTYPE, tmp1);
                if (ret) {
                        printk("%s: Port type setting to %d failed\n",
                               dev->name, tmp1);
                        goto fail;
                }
        }

        /* Setting SSID to empty string seems to kill the card in Host AP mode
         */
        if (local->iw_mode != IW_MODE_MASTER || local->essid[0] != '\0') {
                ret = hostap_set_string(dev, HFA384X_RID_CNFOWNSSID,
                                        local->essid);
                if (ret) {
                        printk("%s: AP own SSID setting failed\n", dev->name);
                        goto fail;
                }
        }

        ret = hostap_set_word(dev, HFA384X_RID_CNFMAXDATALEN,
                              PRISM2_DATA_MAXLEN);
        if (ret) {
                printk("%s: MAC data length setting to %d failed\n",
                       dev->name, PRISM2_DATA_MAXLEN);
                goto fail;
        }

        if (hfa384x_get_rid(dev, HFA384X_RID_CHANNELLIST, &tmp, 2, 1) < 0) {
                printk("%s: Channel list read failed\n", dev->name);
                ret = -EINVAL;
                goto fail;
        }
        local->channel_mask = le16_to_cpu(tmp);

        if (local->channel < 1 || local->channel > 14 ||
            !(local->channel_mask & (1 << (local->channel - 1)))) {
                printk(KERN_WARNING "%s: Channel setting out of range "
                       "(%d)!\n", dev->name, local->channel);
                ret = -EBUSY;
                goto fail;
        }

        ret = hostap_set_word(dev, HFA384X_RID_CNFOWNCHANNEL, local->channel);
        if (ret) {
                printk("%s: Channel setting to %d failed\n",
                       dev->name, local->channel);
                goto fail;
        }

        ret = hostap_set_word(dev, HFA384X_RID_CNFBEACONINT,
                              local->beacon_int);
        if (ret) {
                printk("%s: Beacon interval setting to %d failed\n",
                       dev->name, local->beacon_int);
                /* this may fail with Symbol/Lucent firmware */
                if (ret == -ETIMEDOUT)
                        goto fail;
        }

        ret = hostap_set_word(dev, HFA384X_RID_CNFOWNDTIMPERIOD,
                              local->dtim_period);
        if (ret) {
                printk("%s: DTIM period setting to %d failed\n",
                       dev->name, local->dtim_period);
                /* this may fail with Symbol/Lucent firmware */
                if (ret == -ETIMEDOUT)
                        goto fail;
        }

        ret = hostap_set_word(dev, HFA384X_RID_PROMISCUOUSMODE,
                              local->is_promisc);
        if (ret)
                printk(KERN_INFO "%s: Setting promiscuous mode (%d) failed\n",
                       dev->name, local->is_promisc);

        if (!local->fw_ap) {
                ret = hostap_set_string(dev, HFA384X_RID_CNFDESIREDSSID,
                                        local->essid);
                if (ret) {
                        printk("%s: Desired SSID setting failed\n", dev->name);
                        goto fail;
                }
        }

        /* Setup TXRateControl, defaults to allow use of 1, 2, 5.5, and
         * 11 Mbps in automatic TX rate fallback and 1 and 2 Mbps as basic
         * rates */
        if (local->tx_rate_control == 0) {
                local->tx_rate_control =
                        HFA384X_RATES_1MBPS |
                        HFA384X_RATES_2MBPS |
                        HFA384X_RATES_5MBPS |
                        HFA384X_RATES_11MBPS;
        }
        if (local->basic_rates == 0)
                local->basic_rates = HFA384X_RATES_1MBPS | HFA384X_RATES_2MBPS;

        if (!local->fw_ap) {
                ret = hostap_set_word(dev, HFA384X_RID_TXRATECONTROL,
                                      local->tx_rate_control);
                if (ret) {
                        printk("%s: TXRateControl setting to %d failed\n",
                               dev->name, local->tx_rate_control);
                        goto fail;
                }

                ret = hostap_set_word(dev, HFA384X_RID_CNFSUPPORTEDRATES,
                                      local->tx_rate_control);
                if (ret) {
                        printk("%s: cnfSupportedRates setting to %d failed\n",
                               dev->name, local->tx_rate_control);
                }

                ret = hostap_set_word(dev, HFA384X_RID_CNFBASICRATES,
                                      local->basic_rates);
                if (ret) {
                        printk("%s: cnfBasicRates setting to %d failed\n",
                               dev->name, local->basic_rates);
                }

                ret = hostap_set_word(dev, HFA384X_RID_CREATEIBSS, 1);
                if (ret) {
                        printk("%s: Create IBSS setting to 1 failed\n",
                               dev->name);
                }
        }

        if (local->name_set)
                (void) hostap_set_string(dev, HFA384X_RID_CNFOWNNAME,
                                         local->name);

        if (hostap_set_encryption(local)) {
                printk(KERN_INFO "%s: could not configure encryption\n",
                       dev->name);
        }

        (void) hostap_set_antsel(local);

        if (hostap_set_roaming(local)) {
                printk(KERN_INFO "%s: could not set host roaming\n",
                       dev->name);
        }

        if (local->sta_fw_ver >= PRISM2_FW_VER(1,6,3) &&
            hostap_set_word(dev, HFA384X_RID_CNFENHSECURITY, local->enh_sec))
                printk(KERN_INFO "%s: cnfEnhSecurity setting to 0x%x failed\n",
                       dev->name, local->enh_sec);

        /* 32-bit tallies were added in STA f/w 0.8.0, but they were apparently
         * not working correctly (last seven counters report bogus values).
         * This has been fixed in 0.8.2, so enable 32-bit tallies only
         * beginning with that firmware version. Another bug fix for 32-bit
         * tallies in 1.4.0; should 16-bit tallies be used for some other
         * versions, too? */
        if (local->sta_fw_ver >= PRISM2_FW_VER(0,8,2)) {
                if (hostap_set_word(dev, HFA384X_RID_CNFTHIRTY2TALLY, 1)) {
                        printk(KERN_INFO "%s: cnfThirty2Tally setting "
                               "failed\n", dev->name);
                        local->tallies32 = 0;
                } else
                        local->tallies32 = 1;
        } else
                local->tallies32 = 0;

        hostap_set_auth_algs(local);

        if (hostap_set_word(dev, HFA384X_RID_FRAGMENTATIONTHRESHOLD,
                            local->fragm_threshold)) {
                printk(KERN_INFO "%s: setting FragmentationThreshold to %d "
                       "failed\n", dev->name, local->fragm_threshold);
        }

        if (hostap_set_word(dev, HFA384X_RID_RTSTHRESHOLD,
                            local->rts_threshold)) {
                printk(KERN_INFO "%s: setting RTSThreshold to %d failed\n",
                       dev->name, local->rts_threshold);
        }

        if (local->manual_retry_count >= 0 &&
            hostap_set_word(dev, HFA384X_RID_CNFALTRETRYCOUNT,
                            local->manual_retry_count)) {
                printk(KERN_INFO "%s: setting cnfAltRetryCount to %d failed\n",
                       dev->name, local->manual_retry_count);
        }

        if (local->sta_fw_ver >= PRISM2_FW_VER(1,3,1) &&
            hfa384x_get_rid(dev, HFA384X_RID_CNFDBMADJUST, &tmp, 2, 1) == 2) {
                local->rssi_to_dBm = le16_to_cpu(tmp);
        }

        if (local->sta_fw_ver >= PRISM2_FW_VER(1,7,0) && local->wpa &&
            hostap_set_word(dev, HFA384X_RID_SSNHANDLINGMODE, 1)) {
                printk(KERN_INFO "%s: setting ssnHandlingMode to 1 failed\n",
                       dev->name);
        }

        if (local->sta_fw_ver >= PRISM2_FW_VER(1,7,0) && local->generic_elem &&
            hfa384x_set_rid(dev, HFA384X_RID_GENERICELEMENT,
                            local->generic_elem, local->generic_elem_len)) {
                printk(KERN_INFO "%s: setting genericElement failed\n",
                       dev->name);
        }

 fail:
        return ret;
}


static int prism2_hw_init(struct net_device *dev, int initial)
{
        struct hostap_interface *iface;
        local_info_t *local;
        int ret, first = 1;
        unsigned long start, delay;

        PDEBUG(DEBUG_FLOW, "prism2_hw_init()\n");

        iface = netdev_priv(dev);
        local = iface->local;

        clear_bit(HOSTAP_BITS_TRANSMIT, &local->bits);

 init:
        /* initialize HFA 384x */
        ret = hfa384x_cmd_no_wait(dev, HFA384X_CMDCODE_INIT, 0);
        if (ret) {
                printk(KERN_INFO "%s: first command failed - assuming card "
                       "does not have primary firmware\n", dev_info);
        }

        if (first && (HFA384X_INW(HFA384X_EVSTAT_OFF) & HFA384X_EV_CMD)) {
                /* EvStat has Cmd bit set in some cases, so retry once if no
                 * wait was needed */
                HFA384X_OUTW(HFA384X_EV_CMD, HFA384X_EVACK_OFF);
                printk(KERN_DEBUG "%s: init command completed too quickly - "
                       "retrying\n", dev->name);
                first = 0;
                goto init;
        }

        start = jiffies;
        delay = jiffies + HFA384X_INIT_TIMEOUT;
        while (!(HFA384X_INW(HFA384X_EVSTAT_OFF) & HFA384X_EV_CMD) &&
               time_before(jiffies, delay))
                yield();
        if (!(HFA384X_INW(HFA384X_EVSTAT_OFF) & HFA384X_EV_CMD)) {
                printk(KERN_DEBUG "%s: assuming no Primary image in "
                       "flash - card initialization not completed\n",
                       dev_info);
                local->no_pri = 1;
#ifdef PRISM2_DOWNLOAD_SUPPORT
                        if (local->sram_type == -1)
                                local->sram_type = prism2_get_ram_size(local);
#endif /* PRISM2_DOWNLOAD_SUPPORT */
                return 1;
        }
        local->no_pri = 0;
        printk(KERN_DEBUG "prism2_hw_init: initialized in %lu ms\n",
               (jiffies - start) * 1000 / HZ);
        HFA384X_OUTW(HFA384X_EV_CMD, HFA384X_EVACK_OFF);
        return 0;
}


static int prism2_hw_init2(struct net_device *dev, int initial)
{
        struct hostap_interface *iface;
        local_info_t *local;
        int i;

        iface = netdev_priv(dev);
        local = iface->local;

#ifdef PRISM2_DOWNLOAD_SUPPORT
        kfree(local->pda);
        if (local->no_pri)
                local->pda = NULL;
        else
                local->pda = prism2_read_pda(dev);
#endif /* PRISM2_DOWNLOAD_SUPPORT */

        hfa384x_disable_interrupts(dev);

#ifndef final_version
        HFA384X_OUTW(HFA384X_MAGIC, HFA384X_SWSUPPORT0_OFF);
        if (HFA384X_INW(HFA384X_SWSUPPORT0_OFF) != HFA384X_MAGIC) {
                printk("SWSUPPORT0 write/read failed: %04X != %04X\n",
                       HFA384X_INW(HFA384X_SWSUPPORT0_OFF), HFA384X_MAGIC);
                goto failed;
        }
#endif

        if (initial || local->pri_only) {
                hfa384x_events_only_cmd(dev);
                /* get card version information */
                if (prism2_get_version_info(dev, HFA384X_RID_NICID, "NIC") ||
                    prism2_get_version_info(dev, HFA384X_RID_PRIID, "PRI")) {
                        hfa384x_disable_interrupts(dev);
                        goto failed;
                }

                if (prism2_get_version_info(dev, HFA384X_RID_STAID, "STA")) {
                        printk(KERN_DEBUG "%s: Failed to read STA f/w version "
                               "- only Primary f/w present\n", dev->name);
                        local->pri_only = 1;
                        return 0;
                }
                local->pri_only = 0;
                hfa384x_disable_interrupts(dev);
        }

        /* FIX: could convert allocate_fid to use sleeping CmdCompl wait and
         * enable interrupts before this. This would also require some sort of
         * sleeping AllocEv waiting */

        /* allocate TX FIDs */
        local->txfid_len = PRISM2_TXFID_LEN;
        for (i = 0; i < PRISM2_TXFID_COUNT; i++) {
                local->txfid[i] = hfa384x_allocate_fid(dev, local->txfid_len);
                if (local->txfid[i] == 0xffff && local->txfid_len > 1600) {
                        local->txfid[i] = hfa384x_allocate_fid(dev, 1600);
                        if (local->txfid[i] != 0xffff) {
                                printk(KERN_DEBUG "%s: Using shorter TX FID "
                                       "(1600 bytes)\n", dev->name);
                                local->txfid_len = 1600;
                        }
                }
                if (local->txfid[i] == 0xffff)
                        goto failed;
                local->intransmitfid[i] = PRISM2_TXFID_EMPTY;
        }

        hfa384x_events_only_cmd(dev);

        if (initial) {
                struct list_head *ptr;
                prism2_check_sta_fw_version(local);

                if (hfa384x_get_rid(dev, HFA384X_RID_CNFOWNMACADDR,
                                    dev->dev_addr, 6, 1) < 0) {
                        printk("%s: could not get own MAC address\n",
                               dev->name);
                }
                list_for_each(ptr, &local->hostap_interfaces) {
                        iface = list_entry(ptr, struct hostap_interface, list);
                        eth_hw_addr_inherit(iface->dev, dev);
                }
        } else if (local->fw_ap)
                prism2_check_sta_fw_version(local);

        prism2_setup_rids(dev);

        /* MAC is now configured, but port 0 is not yet enabled */
        return 0;

 failed:
        if (!local->no_pri)
                printk(KERN_WARNING "%s: Initialization failed\n", dev_info);
        return 1;
}


static int prism2_hw_enable(struct net_device *dev, int initial)
{
        struct hostap_interface *iface;
        local_info_t *local;
        int was_resetting;

        iface = netdev_priv(dev);
        local = iface->local;
        was_resetting = local->hw_resetting;

        if (hfa384x_cmd(dev, HFA384X_CMDCODE_ENABLE, 0, NULL, NULL)) {
                printk("%s: MAC port 0 enabling failed\n", dev->name);
                return 1;
        }

        local->hw_ready = 1;
        local->hw_reset_tries = 0;
        local->hw_resetting = 0;
        hfa384x_enable_interrupts(dev);

        /* at least D-Link DWL-650 seems to require additional port reset
         * before it starts acting as an AP, so reset port automatically
         * here just in case */
        if (initial && prism2_reset_port(dev)) {
                printk("%s: MAC port 0 resetting failed\n", dev->name);
                return 1;
        }

        if (was_resetting && netif_queue_stopped(dev)) {
                /* If hw_reset() was called during pending transmit, netif
                 * queue was stopped. Wake it up now since the wlan card has
                 * been resetted. */
                netif_wake_queue(dev);
        }

        return 0;
}


static int prism2_hw_config(struct net_device *dev, int initial)
{
        struct hostap_interface *iface;
        local_info_t *local;

        iface = netdev_priv(dev);
        local = iface->local;

        if (local->hw_downloading)
                return 1;

        if (prism2_hw_init(dev, initial)) {
                return local->no_pri ? 0 : 1;
        }

        if (prism2_hw_init2(dev, initial))
                return 1;

        /* Enable firmware if secondary image is loaded and at least one of the
         * netdevices is up. */
        if (!local->pri_only &&
            (initial == 0 || (initial == 2 && local->num_dev_open > 0))) {
                if (!local->dev_enabled)
                        prism2_callback(local, PRISM2_CALLBACK_ENABLE);
                local->dev_enabled = 1;
                return prism2_hw_enable(dev, initial);
        }

        return 0;
}


static void prism2_hw_shutdown(struct net_device *dev, int no_disable)
{
        struct hostap_interface *iface;
        local_info_t *local;

        iface = netdev_priv(dev);
        local = iface->local;

        /* Allow only command completion events during disable */
        hfa384x_events_only_cmd(dev);

        local->hw_ready = 0;
        if (local->dev_enabled)
                prism2_callback(local, PRISM2_CALLBACK_DISABLE);
        local->dev_enabled = 0;

        if (local->func->card_present && !local->func->card_present(local)) {
                printk(KERN_DEBUG "%s: card already removed or not configured "
                       "during shutdown\n", dev->name);
                return;
        }

        if ((no_disable & HOSTAP_HW_NO_DISABLE) == 0 &&
            hfa384x_cmd(dev, HFA384X_CMDCODE_DISABLE, 0, NULL, NULL))
                printk(KERN_WARNING "%s: Shutdown failed\n", dev_info);

        hfa384x_disable_interrupts(dev);

        if (no_disable & HOSTAP_HW_ENABLE_CMDCOMPL)
                hfa384x_events_only_cmd(dev);
        else
                prism2_clear_cmd_queue(local);
}


static void prism2_hw_reset(struct net_device *dev)
{
        struct hostap_interface *iface;
        local_info_t *local;

#if 0
        static long last_reset = 0;

        /* do not reset card more than once per second to avoid ending up in a
         * busy loop resetting the card */
        if (time_before_eq(jiffies, last_reset + HZ))
                return;
        last_reset = jiffies;
#endif

        iface = netdev_priv(dev);
        local = iface->local;

        if (in_interrupt()) {
                printk(KERN_DEBUG "%s: driver bug - prism2_hw_reset() called "
                       "in interrupt context\n", dev->name);
                return;
        }

        if (local->hw_downloading)
                return;

        if (local->hw_resetting) {
                printk(KERN_WARNING "%s: %s: already resetting card - "
                       "ignoring reset request\n", dev_info, dev->name);
                return;
        }

        local->hw_reset_tries++;
        if (local->hw_reset_tries > 10) {
                printk(KERN_WARNING "%s: too many reset tries, skipping\n",
                       dev->name);
                return;
        }

        printk(KERN_WARNING "%s: %s: resetting card\n", dev_info, dev->name);
        hfa384x_disable_interrupts(dev);
        local->hw_resetting = 1;
        if (local->func->cor_sreset) {
                /* Host system seems to hang in some cases with high traffic
                 * load or shared interrupts during COR sreset. Disable shared
                 * interrupts during reset to avoid these crashes. COS sreset
                 * takes quite a long time, so it is unfortunate that this
                 * seems to be needed. Anyway, I do not know of any better way
                 * of avoiding the crash. */
                disable_irq(dev->irq);
                local->func->cor_sreset(local);
                enable_irq(dev->irq);
        }
        prism2_hw_shutdown(dev, 1);
        prism2_hw_config(dev, 0);
        local->hw_resetting = 0;

#ifdef PRISM2_DOWNLOAD_SUPPORT
        if (local->dl_pri) {
                printk(KERN_DEBUG "%s: persistent download of primary "
                       "firmware\n", dev->name);
                if (prism2_download_genesis(local, local->dl_pri) < 0)
                        printk(KERN_WARNING "%s: download (PRI) failed\n",
                               dev->name);
        }

        if (local->dl_sec) {
                printk(KERN_DEBUG "%s: persistent download of secondary "
                       "firmware\n", dev->name);
                if (prism2_download_volatile(local, local->dl_sec) < 0)
                        printk(KERN_WARNING "%s: download (SEC) failed\n",
                               dev->name);
        }
#endif /* PRISM2_DOWNLOAD_SUPPORT */

        /* TODO: restore beacon TIM bits for STAs that have buffered frames */
}


static void prism2_schedule_reset(local_info_t *local)
{
        schedule_work(&local->reset_queue);
}


/* Called only as scheduled task after noticing card timeout in interrupt
 * context */
static void handle_reset_queue(struct work_struct *work)
{
        local_info_t *local = container_of(work, local_info_t, reset_queue);

        printk(KERN_DEBUG "%s: scheduled card reset\n", local->dev->name);
        prism2_hw_reset(local->dev);

        if (netif_queue_stopped(local->dev)) {
                int i;

                for (i = 0; i < PRISM2_TXFID_COUNT; i++)
                        if (local->intransmitfid[i] == PRISM2_TXFID_EMPTY) {
                                PDEBUG(DEBUG_EXTRA, "prism2_tx_timeout: "
                                       "wake up queue\n");
                                netif_wake_queue(local->dev);
                                break;
                        }
        }
}


static int prism2_get_txfid_idx(local_info_t *local)
{
        int idx, end;
        unsigned long flags;

        spin_lock_irqsave(&local->txfidlock, flags);
        end = idx = local->next_txfid;
        do {
                if (local->intransmitfid[idx] == PRISM2_TXFID_EMPTY) {
                        local->intransmitfid[idx] = PRISM2_TXFID_RESERVED;
                        spin_unlock_irqrestore(&local->txfidlock, flags);
                        return idx;
                }
                idx++;
                if (idx >= PRISM2_TXFID_COUNT)
                        idx = 0;
        } while (idx != end);
        spin_unlock_irqrestore(&local->txfidlock, flags);

        PDEBUG(DEBUG_EXTRA2, "prism2_get_txfid_idx: no room in txfid buf: "
               "packet dropped\n");
        local->dev->stats.tx_dropped++;

        return -1;
}


/* Called only from hardware IRQ */
static void prism2_transmit_cb(struct net_device *dev, long context,
                               u16 resp0, u16 res)
{
        struct hostap_interface *iface;
        local_info_t *local;
        int idx = (int) context;

        iface = netdev_priv(dev);
        local = iface->local;

        if (res) {
                printk(KERN_DEBUG "%s: prism2_transmit_cb - res=0x%02x\n",
                       dev->name, res);
                return;
        }

        if (idx < 0 || idx >= PRISM2_TXFID_COUNT) {
                printk(KERN_DEBUG "%s: prism2_transmit_cb called with invalid "
                       "idx=%d\n", dev->name, idx);
                return;
        }

        if (!test_and_clear_bit(HOSTAP_BITS_TRANSMIT, &local->bits)) {
                printk(KERN_DEBUG "%s: driver bug: prism2_transmit_cb called "
                       "with no pending transmit\n", dev->name);
        }

        if (netif_queue_stopped(dev)) {
                /* ready for next TX, so wake up queue that was stopped in
                 * prism2_transmit() */
                netif_wake_queue(dev);
        }

        spin_lock(&local->txfidlock);

        /* With reclaim, Resp0 contains new txfid for transmit; the old txfid
         * will be automatically allocated for the next TX frame */
        local->intransmitfid[idx] = resp0;

        PDEBUG(DEBUG_FID, "%s: prism2_transmit_cb: txfid[%d]=0x%04x, "
               "resp0=0x%04x, transmit_txfid=0x%04x\n",
               dev->name, idx, local->txfid[idx],
               resp0, local->intransmitfid[local->next_txfid]);

        idx++;
        if (idx >= PRISM2_TXFID_COUNT)
                idx = 0;
        local->next_txfid = idx;

        /* check if all TX buffers are occupied */
        do {
                if (local->intransmitfid[idx] == PRISM2_TXFID_EMPTY) {
                        spin_unlock(&local->txfidlock);
                        return;
                }
                idx++;
                if (idx >= PRISM2_TXFID_COUNT)
                        idx = 0;
        } while (idx != local->next_txfid);
        spin_unlock(&local->txfidlock);

        /* no empty TX buffers, stop queue */
        netif_stop_queue(dev);
}


/* Called only from software IRQ if PCI bus master is not used (with bus master
 * this can be called both from software and hardware IRQ) */
static int prism2_transmit(struct net_device *dev, int idx)
{
        struct hostap_interface *iface;
        local_info_t *local;
        int res;

        iface = netdev_priv(dev);
        local = iface->local;

        /* The driver tries to stop netif queue so that there would not be
         * more than one attempt to transmit frames going on; check that this
         * is really the case */

        if (test_and_set_bit(HOSTAP_BITS_TRANSMIT, &local->bits)) {
                printk(KERN_DEBUG "%s: driver bug - prism2_transmit() called "
                       "when previous TX was pending\n", dev->name);
                return -1;
        }

        /* stop the queue for the time that transmit is pending */
        netif_stop_queue(dev);

        /* transmit packet */
        res = hfa384x_cmd_callback(
                dev,
                HFA384X_CMDCODE_TRANSMIT | HFA384X_CMD_TX_RECLAIM,
                local->txfid[idx],
                prism2_transmit_cb, (long) idx);

        if (res) {
                printk(KERN_DEBUG "%s: prism2_transmit: CMDCODE_TRANSMIT "
                       "failed (res=%d)\n", dev->name, res);
                dev->stats.tx_dropped++;
                netif_wake_queue(dev);
                return -1;
        }
        netif_trans_update(dev);

        /* Since we did not wait for command completion, the card continues
         * to process on the background and we will finish handling when
         * command completion event is handled (prism2_cmd_ev() function) */

        return 0;
}


/* Send IEEE 802.11 frame (convert the header into Prism2 TX descriptor and
 * send the payload with this descriptor) */
/* Called only from software IRQ */
static int prism2_tx_80211(struct sk_buff *skb, struct net_device *dev)
{
        struct hostap_interface *iface;
        local_info_t *local;
        struct hfa384x_tx_frame txdesc;
        struct hostap_skb_tx_data *meta;
        int hdr_len, data_len, idx, res, ret = -1;
        u16 tx_control, fc;

        iface = netdev_priv(dev);
        local = iface->local;

        meta = (struct hostap_skb_tx_data *) skb->cb;

        prism2_callback(local, PRISM2_CALLBACK_TX_START);

        if ((local->func->card_present && !local->func->card_present(local)) ||
            !local->hw_ready || local->hw_downloading || local->pri_only) {
                if (net_ratelimit()) {
                        printk(KERN_DEBUG "%s: prism2_tx_80211: hw not ready -"
                               " skipping\n", dev->name);
                }
                goto fail;
        }

        memset(&txdesc, 0, sizeof(txdesc));

        /* skb->data starts with txdesc->frame_control */
        hdr_len = 24;
        skb_copy_from_linear_data(skb, &txdesc.frame_control, hdr_len);
        fc = le16_to_cpu(txdesc.frame_control);
        if (ieee80211_is_data(txdesc.frame_control) &&
            ieee80211_has_a4(txdesc.frame_control) &&
            skb->len >= 30) {
                /* Addr4 */
                skb_copy_from_linear_data_offset(skb, hdr_len, txdesc.addr4,
                                                 ETH_ALEN);
                hdr_len += ETH_ALEN;
        }

        tx_control = local->tx_control;
        if (meta->tx_cb_idx) {
                tx_control |= HFA384X_TX_CTRL_TX_OK;
                txdesc.sw_support = cpu_to_le32(meta->tx_cb_idx);
        }
        txdesc.tx_control = cpu_to_le16(tx_control);
        txdesc.tx_rate = meta->rate;

        data_len = skb->len - hdr_len;
        txdesc.data_len = cpu_to_le16(data_len);
        txdesc.len = cpu_to_be16(data_len);

        idx = prism2_get_txfid_idx(local);
        if (idx < 0)
                goto fail;

        if (local->frame_dump & PRISM2_DUMP_TX_HDR)
                hostap_dump_tx_header(dev->name, &txdesc);

        spin_lock(&local->baplock);
        res = hfa384x_setup_bap(dev, BAP0, local->txfid[idx], 0);

        if (!res)
                res = hfa384x_to_bap(dev, BAP0, &txdesc, sizeof(txdesc));
        if (!res)
                res = hfa384x_to_bap(dev, BAP0, skb->data + hdr_len,
                                     skb->len - hdr_len);
        spin_unlock(&local->baplock);

        if (!res)
                res = prism2_transmit(dev, idx);
        if (res) {
                printk(KERN_DEBUG "%s: prism2_tx_80211 - to BAP0 failed\n",
                       dev->name);
                local->intransmitfid[idx] = PRISM2_TXFID_EMPTY;
                schedule_work(&local->reset_queue);
                goto fail;
        }

        ret = 0;

fail:
        prism2_callback(local, PRISM2_CALLBACK_TX_END);
        return ret;
}


/* Some SMP systems have reported number of odd errors with hostap_pci. fid
 * register has changed values between consecutive reads for an unknown reason.
 * This should really not happen, so more debugging is needed. This test
 * version is a bit slower, but it will detect most of such register changes
 * and will try to get the correct fid eventually. */
#define EXTRA_FID_READ_TESTS

static u16 prism2_read_fid_reg(struct net_device *dev, u16 reg)
{
#ifdef EXTRA_FID_READ_TESTS
        u16 val, val2, val3;
        int i;

        for (i = 0; i < 10; i++) {
                val = HFA384X_INW(reg);
                val2 = HFA384X_INW(reg);
                val3 = HFA384X_INW(reg);

                if (val == val2 && val == val3)
                        return val;

                printk(KERN_DEBUG "%s: detected fid change (try=%d, reg=%04x):"
                       " %04x %04x %04x\n",
                       dev->name, i, reg, val, val2, val3);
                if ((val == val2 || val == val3) && val != 0)
                        return val;
                if (val2 == val3 && val2 != 0)
                        return val2;
        }
        printk(KERN_WARNING "%s: Uhhuh.. could not read good fid from reg "
               "%04x (%04x %04x %04x)\n", dev->name, reg, val, val2, val3);
        return val;
#else /* EXTRA_FID_READ_TESTS */
        return HFA384X_INW(reg);
#endif /* EXTRA_FID_READ_TESTS */
}


/* Called only as a tasklet (software IRQ) */
static void prism2_rx(local_info_t *local)
{
        struct net_device *dev = local->dev;
        int res, rx_pending = 0;
        u16 len, hdr_len, rxfid, status, macport;
        struct hfa384x_rx_frame rxdesc;
        struct sk_buff *skb = NULL;

        prism2_callback(local, PRISM2_CALLBACK_RX_START);

        rxfid = prism2_read_fid_reg(dev, HFA384X_RXFID_OFF);
#ifndef final_version
        if (rxfid == 0) {
                rxfid = HFA384X_INW(HFA384X_RXFID_OFF);
                printk(KERN_DEBUG "prism2_rx: rxfid=0 (next 0x%04x)\n",
                       rxfid);
                if (rxfid == 0) {
                        schedule_work(&local->reset_queue);
                        goto rx_dropped;
                }
                /* try to continue with the new rxfid value */
        }
#endif

        spin_lock(&local->baplock);
        res = hfa384x_setup_bap(dev, BAP0, rxfid, 0);
        if (!res)
                res = hfa384x_from_bap(dev, BAP0, &rxdesc, sizeof(rxdesc));

        if (res) {
                spin_unlock(&local->baplock);
                printk(KERN_DEBUG "%s: copy from BAP0 failed %d\n", dev->name,
                       res);
                if (res == -ETIMEDOUT) {
                        schedule_work(&local->reset_queue);
                }
                goto rx_dropped;
        }

        len = le16_to_cpu(rxdesc.data_len);
        hdr_len = sizeof(rxdesc);
        status = le16_to_cpu(rxdesc.status);
        macport = (status >> 8) & 0x07;

        /* Drop frames with too large reported payload length. Monitor mode
         * seems to sometimes pass frames (e.g., ctrl::ack) with signed and
         * negative value, so allow also values 65522 .. 65534 (-14 .. -2) for
         * macport 7 */
        if (len > PRISM2_DATA_MAXLEN + 8 /* WEP */) {
                if (macport == 7 && local->iw_mode == IW_MODE_MONITOR) {
                        if (len >= (u16) -14) {
                                hdr_len -= 65535 - len;
                                hdr_len--;
                        }
                        len = 0;
                } else {
                        spin_unlock(&local->baplock);
                        printk(KERN_DEBUG "%s: Received frame with invalid "
                               "length 0x%04x\n", dev->name, len);
                        hostap_dump_rx_header(dev->name, &rxdesc);
                        goto rx_dropped;
                }
        }

        skb = dev_alloc_skb(len + hdr_len);

        if (!skb) {
                spin_unlock(&local->baplock);
                printk(KERN_DEBUG "%s: RX failed to allocate skb\n",
                       dev->name);
                goto rx_dropped;
        }
        skb->dev = dev;
        skb_put_data(skb, &rxdesc, hdr_len);

        if (len > 0)
                res = hfa384x_from_bap(dev, BAP0, skb_put(skb, len), len);
        spin_unlock(&local->baplock);
        if (res) {
                printk(KERN_DEBUG "%s: RX failed to read "
                       "frame data\n", dev->name);
                goto rx_dropped;
        }

        skb_queue_tail(&local->rx_list, skb);
        tasklet_schedule(&local->rx_tasklet);

 rx_exit:
        prism2_callback(local, PRISM2_CALLBACK_RX_END);
        if (!rx_pending) {
                HFA384X_OUTW(HFA384X_EV_RX, HFA384X_EVACK_OFF);
        }

        return;

 rx_dropped:
        dev->stats.rx_dropped++;
        if (skb)
                dev_kfree_skb(skb);
        goto rx_exit;
}


/* Called only as a tasklet (software IRQ) */
static void hostap_rx_skb(local_info_t *local, struct sk_buff *skb)
{
        struct hfa384x_rx_frame *rxdesc;
        struct net_device *dev = skb->dev;
        struct hostap_80211_rx_status stats;
        int hdrlen, rx_hdrlen;

        rx_hdrlen = sizeof(*rxdesc);
        if (skb->len < sizeof(*rxdesc)) {
                /* Allow monitor mode to receive shorter frames */
                if (local->iw_mode == IW_MODE_MONITOR &&
                    skb->len >= sizeof(*rxdesc) - 30) {
                        rx_hdrlen = skb->len;
                } else {
                        dev_kfree_skb(skb);
                        return;
                }
        }

        rxdesc = (struct hfa384x_rx_frame *) skb->data;

        if (local->frame_dump & PRISM2_DUMP_RX_HDR &&
            skb->len >= sizeof(*rxdesc))
                hostap_dump_rx_header(dev->name, rxdesc);

        if (le16_to_cpu(rxdesc->status) & HFA384X_RX_STATUS_FCSERR &&
            (!local->monitor_allow_fcserr ||
             local->iw_mode != IW_MODE_MONITOR))
                goto drop;

        if (skb->len > PRISM2_DATA_MAXLEN) {
                printk(KERN_DEBUG "%s: RX: len(%d) > MAX(%d)\n",
                       dev->name, skb->len, PRISM2_DATA_MAXLEN);
                goto drop;
        }

        stats.mac_time = le32_to_cpu(rxdesc->time);
        stats.signal = rxdesc->signal - local->rssi_to_dBm;
        stats.noise = rxdesc->silence - local->rssi_to_dBm;
        stats.rate = rxdesc->rate;

        /* Convert Prism2 RX structure into IEEE 802.11 header */
        hdrlen = hostap_80211_get_hdrlen(rxdesc->frame_control);
        if (hdrlen > rx_hdrlen)
                hdrlen = rx_hdrlen;

        memmove(skb_pull(skb, rx_hdrlen - hdrlen),
                &rxdesc->frame_control, hdrlen);

        hostap_80211_rx(dev, skb, &stats);
        return;

 drop:
        dev_kfree_skb(skb);
}


/* Called only as a tasklet (software IRQ) */
static void hostap_rx_tasklet(unsigned long data)
{
        local_info_t *local = (local_info_t *) data;
        struct sk_buff *skb;

        while ((skb = skb_dequeue(&local->rx_list)) != NULL)
                hostap_rx_skb(local, skb);
}


/* Called only from hardware IRQ */
static void prism2_alloc_ev(struct net_device *dev)
{
        struct hostap_interface *iface;
        local_info_t *local;
        int idx;
        u16 fid;

        iface = netdev_priv(dev);
        local = iface->local;

        fid = prism2_read_fid_reg(dev, HFA384X_ALLOCFID_OFF);

        PDEBUG(DEBUG_FID, "FID: interrupt: ALLOC - fid=0x%04x\n", fid);

        spin_lock(&local->txfidlock);
        idx = local->next_alloc;

        do {
                if (local->txfid[idx] == fid) {
                        PDEBUG(DEBUG_FID, "FID: found matching txfid[%d]\n",
                               idx);

#ifndef final_version
                        if (local->intransmitfid[idx] == PRISM2_TXFID_EMPTY)
                                printk("Already released txfid found at idx "
                                       "%d\n", idx);
                        if (local->intransmitfid[idx] == PRISM2_TXFID_RESERVED)
                                printk("Already reserved txfid found at idx "
                                       "%d\n", idx);
#endif
                        local->intransmitfid[idx] = PRISM2_TXFID_EMPTY;
                        idx++;
                        local->next_alloc = idx >= PRISM2_TXFID_COUNT ? 0 :
                                idx;

                        if (!test_bit(HOSTAP_BITS_TRANSMIT, &local->bits) &&
                            netif_queue_stopped(dev))
                                netif_wake_queue(dev);

                        spin_unlock(&local->txfidlock);
                        return;
                }

                idx++;
                if (idx >= PRISM2_TXFID_COUNT)
                        idx = 0;
        } while (idx != local->next_alloc);

        printk(KERN_WARNING "%s: could not find matching txfid (0x%04x, new "
               "read 0x%04x) for alloc event\n", dev->name, fid,
               HFA384X_INW(HFA384X_ALLOCFID_OFF));
        printk(KERN_DEBUG "TXFIDs:");
        for (idx = 0; idx < PRISM2_TXFID_COUNT; idx++)
                printk(" %04x[%04x]", local->txfid[idx],
                       local->intransmitfid[idx]);
        printk("\n");
        spin_unlock(&local->txfidlock);

        /* FIX: should probably schedule reset; reference to one txfid was lost
         * completely.. Bad things will happen if we run out of txfids
         * Actually, this will cause netdev watchdog to notice TX timeout and
         * then card reset after all txfids have been leaked. */
}


/* Called only as a tasklet (software IRQ) */
static void hostap_tx_callback(local_info_t *local,
                               struct hfa384x_tx_frame *txdesc, int ok,
                               char *payload)
{
        u16 sw_support, hdrlen, len;
        struct sk_buff *skb;
        struct hostap_tx_callback_info *cb;

        /* Make sure that frame was from us. */
        if (!ether_addr_equal(txdesc->addr2, local->dev->dev_addr)) {
                printk(KERN_DEBUG "%s: TX callback - foreign frame\n",
                       local->dev->name);
                return;
        }

        sw_support = le32_to_cpu(txdesc->sw_support);

        spin_lock(&local->lock);
        cb = local->tx_callback;
        while (cb != NULL && cb->idx != sw_support)
                cb = cb->next;
        spin_unlock(&local->lock);

        if (cb == NULL) {
                printk(KERN_DEBUG "%s: could not find TX callback (idx %d)\n",
                       local->dev->name, sw_support);
                return;
        }

        hdrlen = hostap_80211_get_hdrlen(txdesc->frame_control);
        len = le16_to_cpu(txdesc->data_len);
        skb = dev_alloc_skb(hdrlen + len);
        if (skb == NULL) {
                printk(KERN_DEBUG "%s: hostap_tx_callback failed to allocate "
                       "skb\n", local->dev->name);
                return;
        }

        skb_put_data(skb, (void *)&txdesc->frame_control, hdrlen);
        if (payload)
                skb_put_data(skb, payload, len);

        skb->dev = local->dev;
        skb_reset_mac_header(skb);

        cb->func(skb, ok, cb->data);
}


/* Called only as a tasklet (software IRQ) */
static int hostap_tx_compl_read(local_info_t *local, int error,
                                struct hfa384x_tx_frame *txdesc,
                                char **payload)
{
        u16 fid, len;
        int res, ret = 0;
        struct net_device *dev = local->dev;

        fid = prism2_read_fid_reg(dev, HFA384X_TXCOMPLFID_OFF);

        PDEBUG(DEBUG_FID, "interrupt: TX (err=%d) - fid=0x%04x\n", fid, error);

        spin_lock(&local->baplock);
        res = hfa384x_setup_bap(dev, BAP0, fid, 0);
        if (!res)
                res = hfa384x_from_bap(dev, BAP0, txdesc, sizeof(*txdesc));
        if (res) {
                PDEBUG(DEBUG_EXTRA, "%s: TX (err=%d) - fid=0x%04x - could not "
                       "read txdesc\n", dev->name, error, fid);
                if (res == -ETIMEDOUT) {
                        schedule_work(&local->reset_queue);
                }
                ret = -1;
                goto fail;
        }
        if (txdesc->sw_support) {
                len = le16_to_cpu(txdesc->data_len);
                if (len < PRISM2_DATA_MAXLEN) {
                        *payload = kmalloc(len, GFP_ATOMIC);
                        if (*payload == NULL ||
                            hfa384x_from_bap(dev, BAP0, *payload, len)) {
                                PDEBUG(DEBUG_EXTRA, "%s: could not read TX "
                                       "frame payload\n", dev->name);
                                kfree(*payload);
                                *payload = NULL;
                                ret = -1;
                                goto fail;
                        }
                }
        }

 fail:
        spin_unlock(&local->baplock);

        return ret;
}


/* Called only as a tasklet (software IRQ) */
static void prism2_tx_ev(local_info_t *local)
{
        struct net_device *dev = local->dev;
        char *payload = NULL;
        struct hfa384x_tx_frame txdesc;

        if (hostap_tx_compl_read(local, 0, &txdesc, &payload))
                goto fail;

        if (local->frame_dump & PRISM2_DUMP_TX_HDR) {
                PDEBUG(DEBUG_EXTRA, "%s: TX - status=0x%04x "
                       "retry_count=%d tx_rate=%d seq_ctrl=%d "
                       "duration_id=%d\n",
                       dev->name, le16_to_cpu(txdesc.status),
                       txdesc.retry_count, txdesc.tx_rate,
                       le16_to_cpu(txdesc.seq_ctrl),
                       le16_to_cpu(txdesc.duration_id));
        }

        if (txdesc.sw_support)
                hostap_tx_callback(local, &txdesc, 1, payload);
        kfree(payload);

 fail:
        HFA384X_OUTW(HFA384X_EV_TX, HFA384X_EVACK_OFF);
}


/* Called only as a tasklet (software IRQ) */
static void hostap_sta_tx_exc_tasklet(unsigned long data)
{
        local_info_t *local = (local_info_t *) data;
        struct sk_buff *skb;

        while ((skb = skb_dequeue(&local->sta_tx_exc_list)) != NULL) {
                struct hfa384x_tx_frame *txdesc =
                        (struct hfa384x_tx_frame *) skb->data;

                if (skb->len >= sizeof(*txdesc)) {
                        /* Convert Prism2 RX structure into IEEE 802.11 header
                         */
                        int hdrlen = hostap_80211_get_hdrlen(txdesc->frame_control);
                        memmove(skb_pull(skb, sizeof(*txdesc) - hdrlen),
                                &txdesc->frame_control, hdrlen);

                        hostap_handle_sta_tx_exc(local, skb);
                }
                dev_kfree_skb(skb);
        }
}


/* Called only as a tasklet (software IRQ) */
static void prism2_txexc(local_info_t *local)
{
        struct net_device *dev = local->dev;
        u16 status, fc;
        int show_dump, res;
        char *payload = NULL;
        struct hfa384x_tx_frame txdesc;

        show_dump = local->frame_dump & PRISM2_DUMP_TXEXC_HDR;
        dev->stats.tx_errors++;

        res = hostap_tx_compl_read(local, 1, &txdesc, &payload);
        HFA384X_OUTW(HFA384X_EV_TXEXC, HFA384X_EVACK_OFF);
        if (res)
                return;

        status = le16_to_cpu(txdesc.status);

        /* We produce a TXDROP event only for retry or lifetime
         * exceeded, because that's the only status that really mean
         * that this particular node went away.
         * Other errors means that *we* screwed up. - Jean II */
        if (status & (HFA384X_TX_STATUS_RETRYERR | HFA384X_TX_STATUS_AGEDERR))
        {
                union iwreq_data wrqu;

                /* Copy 802.11 dest address. */
                memcpy(wrqu.addr.sa_data, txdesc.addr1, ETH_ALEN);
                wrqu.addr.sa_family = ARPHRD_ETHER;
                wireless_send_event(dev, IWEVTXDROP, &wrqu, NULL);
        } else
                show_dump = 1;

        if (local->iw_mode == IW_MODE_MASTER ||
            local->iw_mode == IW_MODE_REPEAT ||
            local->wds_type & HOSTAP_WDS_AP_CLIENT) {
                struct sk_buff *skb;
                skb = dev_alloc_skb(sizeof(txdesc));
                if (skb) {
                        skb_put_data(skb, &txdesc, sizeof(txdesc));
                        skb_queue_tail(&local->sta_tx_exc_list, skb);
                        tasklet_schedule(&local->sta_tx_exc_tasklet);
                }
        }

        if (txdesc.sw_support)
                hostap_tx_callback(local, &txdesc, 0, payload);
        kfree(payload);

        if (!show_dump)
                return;

        PDEBUG(DEBUG_EXTRA, "%s: TXEXC - status=0x%04x (%s%s%s%s)"
               " tx_control=%04x\n",
               dev->name, status,
               status & HFA384X_TX_STATUS_RETRYERR ? "[RetryErr]" : "",
               status & HFA384X_TX_STATUS_AGEDERR ? "[AgedErr]" : "",
               status & HFA384X_TX_STATUS_DISCON ? "[Discon]" : "",
               status & HFA384X_TX_STATUS_FORMERR ? "[FormErr]" : "",
               le16_to_cpu(txdesc.tx_control));

        fc = le16_to_cpu(txdesc.frame_control);
        PDEBUG(DEBUG_EXTRA, "   retry_count=%d tx_rate=%d fc=0x%04x "
               "(%s%s%s::%d%s%s)\n",
               txdesc.retry_count, txdesc.tx_rate, fc,
               ieee80211_is_mgmt(txdesc.frame_control) ? "Mgmt" : "",
               ieee80211_is_ctl(txdesc.frame_control) ? "Ctrl" : "",
               ieee80211_is_data(txdesc.frame_control) ? "Data" : "",
               (fc & IEEE80211_FCTL_STYPE) >> 4,
               ieee80211_has_tods(txdesc.frame_control) ? " ToDS" : "",
               ieee80211_has_fromds(txdesc.frame_control) ? " FromDS" : "");
        PDEBUG(DEBUG_EXTRA, "   A1=%pM A2=%pM A3=%pM A4=%pM\n",
               txdesc.addr1, txdesc.addr2,
               txdesc.addr3, txdesc.addr4);
}


/* Called only as a tasklet (software IRQ) */
static void hostap_info_tasklet(unsigned long data)
{
        local_info_t *local = (local_info_t *) data;
        struct sk_buff *skb;

        while ((skb = skb_dequeue(&local->info_list)) != NULL) {
                hostap_info_process(local, skb);
                dev_kfree_skb(skb);
        }
}


/* Called only as a tasklet (software IRQ) */
static void prism2_info(local_info_t *local)
{
        struct net_device *dev = local->dev;
        u16 fid;
        int res, left;
        struct hfa384x_info_frame info;
        struct sk_buff *skb;

        fid = HFA384X_INW(HFA384X_INFOFID_OFF);

        spin_lock(&local->baplock);
        res = hfa384x_setup_bap(dev, BAP0, fid, 0);
        if (!res)
                res = hfa384x_from_bap(dev, BAP0, &info, sizeof(info));
        if (res) {
                spin_unlock(&local->baplock);
                printk(KERN_DEBUG "Could not get info frame (fid=0x%04x)\n",
                       fid);
                if (res == -ETIMEDOUT) {
                        schedule_work(&local->reset_queue);
                }
                goto out;
        }

        left = (le16_to_cpu(info.len) - 1) * 2;

        if (info.len & cpu_to_le16(0x8000) || info.len == 0 || left > 2060) {
                /* data register seems to give 0x8000 in some error cases even
                 * though busy bit is not set in offset register;
                 * in addition, length must be at least 1 due to type field */
                spin_unlock(&local->baplock);
                printk(KERN_DEBUG "%s: Received info frame with invalid "
                       "length 0x%04x (type 0x%04x)\n", dev->name,
                       le16_to_cpu(info.len), le16_to_cpu(info.type));
                goto out;
        }

        skb = dev_alloc_skb(sizeof(info) + left);
        if (skb == NULL) {
                spin_unlock(&local->baplock);
                printk(KERN_DEBUG "%s: Could not allocate skb for info "
                       "frame\n", dev->name);
                goto out;
        }

        skb_put_data(skb, &info, sizeof(info));
        if (left > 0 && hfa384x_from_bap(dev, BAP0, skb_put(skb, left), left))
        {
                spin_unlock(&local->baplock);
                printk(KERN_WARNING "%s: Info frame read failed (fid=0x%04x, "
                       "len=0x%04x, type=0x%04x\n", dev->name, fid,
                       le16_to_cpu(info.len), le16_to_cpu(info.type));
                dev_kfree_skb(skb);
                goto out;
        }
        spin_unlock(&local->baplock);

        skb_queue_tail(&local->info_list, skb);
        tasklet_schedule(&local->info_tasklet);

 out:
        HFA384X_OUTW(HFA384X_EV_INFO, HFA384X_EVACK_OFF);
}


/* Called only as a tasklet (software IRQ) */
static void hostap_bap_tasklet(unsigned long data)
{
        local_info_t *local = (local_info_t *) data;
        struct net_device *dev = local->dev;
        u16 ev;
        int frames = 30;

        if (local->func->card_present && !local->func->card_present(local))
                return;

        set_bit(HOSTAP_BITS_BAP_TASKLET, &local->bits);

        /* Process all pending BAP events without generating new interrupts
         * for them */
        while (frames-- > 0) {
                ev = HFA384X_INW(HFA384X_EVSTAT_OFF);
                if (ev == 0xffff || !(ev & HFA384X_BAP0_EVENTS))
                        break;
                if (ev & HFA384X_EV_RX)
                        prism2_rx(local);
                if (ev & HFA384X_EV_INFO)
                        prism2_info(local);
                if (ev & HFA384X_EV_TX)
                        prism2_tx_ev(local);
                if (ev & HFA384X_EV_TXEXC)
                        prism2_txexc(local);
        }

        set_bit(HOSTAP_BITS_BAP_TASKLET2, &local->bits);
        clear_bit(HOSTAP_BITS_BAP_TASKLET, &local->bits);

        /* Enable interrupts for new BAP events */
        hfa384x_events_all(dev);
        clear_bit(HOSTAP_BITS_BAP_TASKLET2, &local->bits);
}


/* Called only from hardware IRQ */
static void prism2_infdrop(struct net_device *dev)
{
        static unsigned long last_inquire = 0;

        PDEBUG(DEBUG_EXTRA, "%s: INFDROP event\n", dev->name);

        /* some firmware versions seem to get stuck with
         * full CommTallies in high traffic load cases; every
         * packet will then cause INFDROP event and CommTallies
         * info frame will not be sent automatically. Try to
         * get out of this state by inquiring CommTallies. */
        if (!last_inquire || time_after(jiffies, last_inquire + HZ)) {
                hfa384x_cmd_callback(dev, HFA384X_CMDCODE_INQUIRE,
                                     HFA384X_INFO_COMMTALLIES, NULL, 0);
                last_inquire = jiffies;
        }
}


/* Called only from hardware IRQ */
static void prism2_ev_tick(struct net_device *dev)
{
        struct hostap_interface *iface;
        local_info_t *local;
        u16 evstat, inten;
        static int prev_stuck = 0;

        iface = netdev_priv(dev);
        local = iface->local;

        if (time_after(jiffies, local->last_tick_timer + 5 * HZ) &&
            local->last_tick_timer) {
                evstat = HFA384X_INW(HFA384X_EVSTAT_OFF);
                inten = HFA384X_INW(HFA384X_INTEN_OFF);
                if (!prev_stuck) {
                        printk(KERN_INFO "%s: SW TICK stuck? "
                               "bits=0x%lx EvStat=%04x IntEn=%04x\n",
                               dev->name, local->bits, evstat, inten);
                }
                local->sw_tick_stuck++;
                if ((evstat & HFA384X_BAP0_EVENTS) &&
                    (inten & HFA384X_BAP0_EVENTS)) {
                        printk(KERN_INFO "%s: trying to recover from IRQ "
                               "hang\n", dev->name);
                        hfa384x_events_no_bap0(dev);
                }
                prev_stuck = 1;
        } else
                prev_stuck = 0;
}


/* Called only from hardware IRQ */
static void prism2_check_magic(local_info_t *local)
{
        /* at least PCI Prism2.5 with bus mastering seems to sometimes
         * return 0x0000 in SWSUPPORT0 for unknown reason, but re-reading the
         * register once or twice seems to get the correct value.. PCI cards
         * cannot anyway be removed during normal operation, so there is not
         * really any need for this verification with them. */

#ifndef PRISM2_PCI
#ifndef final_version
        static unsigned long last_magic_err = 0;
        struct net_device *dev = local->dev;

        if (HFA384X_INW(HFA384X_SWSUPPORT0_OFF) != HFA384X_MAGIC) {
                if (!local->hw_ready)
                        return;
                HFA384X_OUTW(0xffff, HFA384X_EVACK_OFF);
                if (time_after(jiffies, last_magic_err + 10 * HZ)) {
                        printk("%s: Interrupt, but SWSUPPORT0 does not match: "
                               "%04X != %04X - card removed?\n", dev->name,
                               HFA384X_INW(HFA384X_SWSUPPORT0_OFF),
                               HFA384X_MAGIC);
                        last_magic_err = jiffies;
                } else if (net_ratelimit()) {
                        printk(KERN_DEBUG "%s: interrupt - SWSUPPORT0=%04x "
                               "MAGIC=%04x\n", dev->name,
                               HFA384X_INW(HFA384X_SWSUPPORT0_OFF),
                               HFA384X_MAGIC);
                }
                if (HFA384X_INW(HFA384X_SWSUPPORT0_OFF) != 0xffff)
                        schedule_work(&local->reset_queue);
                return;
        }
#endif /* final_version */
#endif /* !PRISM2_PCI */
}


/* Called only from hardware IRQ */
static irqreturn_t prism2_interrupt(int irq, void *dev_id)
{
        struct net_device *dev = dev_id;
        struct hostap_interface *iface;
        local_info_t *local;
        int events = 0;
        u16 ev;

        iface = netdev_priv(dev);
        local = iface->local;

        /* Detect early interrupt before driver is fully configured */
        spin_lock(&local->irq_init_lock);
        if (!dev->base_addr) {
                if (net_ratelimit()) {
                        printk(KERN_DEBUG "%s: Interrupt, but dev not configured\n",
                               dev->name);
                }
                spin_unlock(&local->irq_init_lock);
                return IRQ_HANDLED;
        }
        spin_unlock(&local->irq_init_lock);

        prism2_io_debug_add(dev, PRISM2_IO_DEBUG_CMD_INTERRUPT, 0, 0);

        if (local->func->card_present && !local->func->card_present(local)) {
                if (net_ratelimit()) {
                        printk(KERN_DEBUG "%s: Interrupt, but dev not OK\n",
                               dev->name);
                }
                return IRQ_HANDLED;
        }

        prism2_check_magic(local);

        for (;;) {
                ev = HFA384X_INW(HFA384X_EVSTAT_OFF);
                if (ev == 0xffff) {
                        if (local->shutdown)
                                return IRQ_HANDLED;
                        HFA384X_OUTW(0xffff, HFA384X_EVACK_OFF);
                        printk(KERN_DEBUG "%s: prism2_interrupt: ev=0xffff\n",
                               dev->name);
                        return IRQ_HANDLED;
                }

                ev &= HFA384X_INW(HFA384X_INTEN_OFF);
                if (ev == 0)
                        break;

                if (ev & HFA384X_EV_CMD) {
                        prism2_cmd_ev(dev);
                }

                /* Above events are needed even before hw is ready, but other
                 * events should be skipped during initialization. This may
                 * change for AllocEv if allocate_fid is implemented without
                 * busy waiting. */
                if (!local->hw_ready || local->hw_resetting ||
                    !local->dev_enabled) {
                        ev = HFA384X_INW(HFA384X_EVSTAT_OFF);
                        if (ev & HFA384X_EV_CMD)
                                goto next_event;
                        if ((ev & HFA384X_EVENT_MASK) == 0)
                                return IRQ_HANDLED;
                        if (local->dev_enabled && (ev & ~HFA384X_EV_TICK) &&
                            net_ratelimit()) {
                                printk(KERN_DEBUG "%s: prism2_interrupt: hw "
                                       "not ready; skipping events 0x%04x "
                                       "(IntEn=0x%04x)%s%s%s\n",
                                       dev->name, ev,
                                       HFA384X_INW(HFA384X_INTEN_OFF),
                                       !local->hw_ready ? " (!hw_ready)" : "",
                                       local->hw_resetting ?
                                       " (hw_resetting)" : "",
                                       !local->dev_enabled ?
                                       " (!dev_enabled)" : "");
                        }
                        HFA384X_OUTW(ev, HFA384X_EVACK_OFF);
                        return IRQ_HANDLED;
                }

                if (ev & HFA384X_EV_TICK) {
                        prism2_ev_tick(dev);
                        HFA384X_OUTW(HFA384X_EV_TICK, HFA384X_EVACK_OFF);
                }

                if (ev & HFA384X_EV_ALLOC) {
                        prism2_alloc_ev(dev);
                        HFA384X_OUTW(HFA384X_EV_ALLOC, HFA384X_EVACK_OFF);
                }

                /* Reading data from the card is quite time consuming, so do it
                 * in tasklets. TX, TXEXC, RX, and INFO events will be ACKed
                 * and unmasked after needed data has been read completely. */
                if (ev & HFA384X_BAP0_EVENTS) {
                        hfa384x_events_no_bap0(dev);
                        tasklet_schedule(&local->bap_tasklet);
                }

#ifndef final_version
                if (ev & HFA384X_EV_WTERR) {
                        PDEBUG(DEBUG_EXTRA, "%s: WTERR event\n", dev->name);
                        HFA384X_OUTW(HFA384X_EV_WTERR, HFA384X_EVACK_OFF);
                }
#endif /* final_version */

                if (ev & HFA384X_EV_INFDROP) {
                        prism2_infdrop(dev);
                        HFA384X_OUTW(HFA384X_EV_INFDROP, HFA384X_EVACK_OFF);
                }

        next_event:
                events++;
                if (events >= PRISM2_MAX_INTERRUPT_EVENTS) {
                        PDEBUG(DEBUG_EXTRA, "prism2_interrupt: >%d events "
                               "(EvStat=0x%04x)\n",
                               PRISM2_MAX_INTERRUPT_EVENTS,
                               HFA384X_INW(HFA384X_EVSTAT_OFF));
                        break;
                }
        }
        prism2_io_debug_add(dev, PRISM2_IO_DEBUG_CMD_INTERRUPT, 0, 1);
        return IRQ_RETVAL(events);
}


static void prism2_check_sta_fw_version(local_info_t *local)
{
        struct hfa384x_comp_ident comp;
        int id, variant, major, minor;

        if (hfa384x_get_rid(local->dev, HFA384X_RID_STAID,
                            &comp, sizeof(comp), 1) < 0)
                return;

        local->fw_ap = 0;
        id = le16_to_cpu(comp.id);
        if (id != HFA384X_COMP_ID_STA) {
                if (id == HFA384X_COMP_ID_FW_AP)
                        local->fw_ap = 1;
                return;
        }

        major = __le16_to_cpu(comp.major);
        minor = __le16_to_cpu(comp.minor);
        variant = __le16_to_cpu(comp.variant);
        local->sta_fw_ver = PRISM2_FW_VER(major, minor, variant);

        /* Station firmware versions before 1.4.x seem to have a bug in
         * firmware-based WEP encryption when using Host AP mode, so use
         * host_encrypt as a default for them. Firmware version 1.4.9 is the
         * first one that has been seen to produce correct encryption, but the
         * bug might be fixed before that (although, at least 1.4.2 is broken).
         */
        local->fw_encrypt_ok = local->sta_fw_ver >= PRISM2_FW_VER(1,4,9);

        if (local->iw_mode == IW_MODE_MASTER && !local->host_encrypt &&
            !local->fw_encrypt_ok) {
                printk(KERN_DEBUG "%s: defaulting to host-based encryption as "
                       "a workaround for firmware bug in Host AP mode WEP\n",
                       local->dev->name);
                local->host_encrypt = 1;
        }

        /* IEEE 802.11 standard compliant WDS frames (4 addresses) were broken
         * in station firmware versions before 1.5.x. With these versions, the
         * driver uses a workaround with bogus frame format (4th address after
         * the payload). This is not compatible with other AP devices. Since
         * the firmware bug is fixed in the latest station firmware versions,
         * automatically enable standard compliant mode for cards using station
         * firmware version 1.5.0 or newer. */
        if (local->sta_fw_ver >= PRISM2_FW_VER(1,5,0))
                local->wds_type |= HOSTAP_WDS_STANDARD_FRAME;
        else {
                printk(KERN_DEBUG "%s: defaulting to bogus WDS frame as a "
                       "workaround for firmware bug in Host AP mode WDS\n",
                       local->dev->name);
        }

        hostap_check_sta_fw_version(local->ap, local->sta_fw_ver);
}


static void hostap_passive_scan(struct timer_list *t)
{
        local_info_t *local = from_timer(local, t, passive_scan_timer);
        struct net_device *dev = local->dev;
        u16 chan;

        if (local->passive_scan_interval <= 0)
                return;

        if (local->passive_scan_state == PASSIVE_SCAN_LISTEN) {
                int max_tries = 16;

                /* Even though host system does not really know when the WLAN
                 * MAC is sending frames, try to avoid changing channels for
                 * passive scanning when a host-generated frame is being
                 * transmitted */
                if (test_bit(HOSTAP_BITS_TRANSMIT, &local->bits)) {
                        printk(KERN_DEBUG "%s: passive scan detected pending "
                               "TX - delaying\n", dev->name);
                        local->passive_scan_timer.expires = jiffies + HZ / 10;
                        add_timer(&local->passive_scan_timer);
                        return;
                }

                do {
                        local->passive_scan_channel++;
                        if (local->passive_scan_channel > 14)
                                local->passive_scan_channel = 1;
                        max_tries--;
                } while (!(local->channel_mask &
                           (1 << (local->passive_scan_channel - 1))) &&
                         max_tries > 0);

                if (max_tries == 0) {
                        printk(KERN_INFO "%s: no allowed passive scan channels"
                               " found\n", dev->name);
                        return;
                }

                printk(KERN_DEBUG "%s: passive scan channel %d\n",
                       dev->name, local->passive_scan_channel);
                chan = local->passive_scan_channel;
                local->passive_scan_state = PASSIVE_SCAN_WAIT;
                local->passive_scan_timer.expires = jiffies + HZ / 10;
        } else {
                chan = local->channel;
                local->passive_scan_state = PASSIVE_SCAN_LISTEN;
                local->passive_scan_timer.expires = jiffies +
                        local->passive_scan_interval * HZ;
        }

        if (hfa384x_cmd_callback(dev, HFA384X_CMDCODE_TEST |
                                 (HFA384X_TEST_CHANGE_CHANNEL << 8),
                                 chan, NULL, 0))
                printk(KERN_ERR "%s: passive scan channel set %d "
                       "failed\n", dev->name, chan);

        add_timer(&local->passive_scan_timer);
}


/* Called only as a scheduled task when communications quality values should
 * be updated. */
static void handle_comms_qual_update(struct work_struct *work)
{
        local_info_t *local =
                container_of(work, local_info_t, comms_qual_update);
        prism2_update_comms_qual(local->dev);
}


/* Software watchdog - called as a timer. Hardware interrupt (Tick event) is
 * used to monitor that local->last_tick_timer is being updated. If not,
 * interrupt busy-loop is assumed and driver tries to recover by masking out
 * some events. */
static void hostap_tick_timer(struct timer_list *t)
{
        static unsigned long last_inquire = 0;
        local_info_t *local = from_timer(local, t, tick_timer);
        local->last_tick_timer = jiffies;

        /* Inquire CommTallies every 10 seconds to keep the statistics updated
         * more often during low load and when using 32-bit tallies. */
        if ((!last_inquire || time_after(jiffies, last_inquire + 10 * HZ)) &&
            !local->hw_downloading && local->hw_ready &&
            !local->hw_resetting && local->dev_enabled) {
                hfa384x_cmd_callback(local->dev, HFA384X_CMDCODE_INQUIRE,
                                     HFA384X_INFO_COMMTALLIES, NULL, 0);
                last_inquire = jiffies;
        }

        if ((local->last_comms_qual_update == 0 ||
             time_after(jiffies, local->last_comms_qual_update + 10 * HZ)) &&
            (local->iw_mode == IW_MODE_INFRA ||
             local->iw_mode == IW_MODE_ADHOC)) {
                schedule_work(&local->comms_qual_update);
        }

        local->tick_timer.expires = jiffies + 2 * HZ;
        add_timer(&local->tick_timer);
}


#ifndef PRISM2_NO_PROCFS_DEBUG
static int prism2_registers_proc_show(struct seq_file *m, void *v)
{
        local_info_t *local = m->private;

#define SHOW_REG(n) \
  seq_printf(m, #n "=%04x\n", hfa384x_read_reg(local->dev, HFA384X_##n##_OFF))

        SHOW_REG(CMD);
        SHOW_REG(PARAM0);
        SHOW_REG(PARAM1);
        SHOW_REG(PARAM2);
        SHOW_REG(STATUS);
        SHOW_REG(RESP0);
        SHOW_REG(RESP1);
        SHOW_REG(RESP2);
        SHOW_REG(INFOFID);
        SHOW_REG(CONTROL);
        SHOW_REG(SELECT0);
        SHOW_REG(SELECT1);
        SHOW_REG(OFFSET0);
        SHOW_REG(OFFSET1);
        SHOW_REG(RXFID);
        SHOW_REG(ALLOCFID);
        SHOW_REG(TXCOMPLFID);
        SHOW_REG(SWSUPPORT0);
        SHOW_REG(SWSUPPORT1);
        SHOW_REG(SWSUPPORT2);
        SHOW_REG(EVSTAT);
        SHOW_REG(INTEN);
        SHOW_REG(EVACK);
        /* Do not read data registers, because they change the state of the
         * MAC (offset += 2) */
        /* SHOW_REG(DATA0); */
        /* SHOW_REG(DATA1); */
        SHOW_REG(AUXPAGE);
        SHOW_REG(AUXOFFSET);
        /* SHOW_REG(AUXDATA); */
#ifdef PRISM2_PCI
        SHOW_REG(PCICOR);
        SHOW_REG(PCIHCR);
        SHOW_REG(PCI_M0_ADDRH);
        SHOW_REG(PCI_M0_ADDRL);
        SHOW_REG(PCI_M0_LEN);
        SHOW_REG(PCI_M0_CTL);
        SHOW_REG(PCI_STATUS);
        SHOW_REG(PCI_M1_ADDRH);
        SHOW_REG(PCI_M1_ADDRL);
        SHOW_REG(PCI_M1_LEN);
        SHOW_REG(PCI_M1_CTL);
#endif /* PRISM2_PCI */

        return 0;
}
#endif /* PRISM2_NO_PROCFS_DEBUG */


struct set_tim_data {
        struct list_head list;
        int aid;
        int set;
};

static int prism2_set_tim(struct net_device *dev, int aid, int set)
{
        struct list_head *ptr;
        struct set_tim_data *new_entry;
        struct hostap_interface *iface;
        local_info_t *local;

        iface = netdev_priv(dev);
        local = iface->local;

        new_entry = kzalloc(sizeof(*new_entry), GFP_ATOMIC);
        if (new_entry == NULL)
                return -ENOMEM;

        new_entry->aid = aid;
        new_entry->set = set;

        spin_lock_bh(&local->set_tim_lock);
        list_for_each(ptr, &local->set_tim_list) {
                struct set_tim_data *entry =
                        list_entry(ptr, struct set_tim_data, list);
                if (entry->aid == aid) {
                        PDEBUG(DEBUG_PS2, "%s: prism2_set_tim: aid=%d "
                               "set=%d ==> %d\n",
                               local->dev->name, aid, entry->set, set);
                        entry->set = set;
                        kfree(new_entry);
                        new_entry = NULL;
                        break;
                }
        }
        if (new_entry)
                list_add_tail(&new_entry->list, &local->set_tim_list);
        spin_unlock_bh(&local->set_tim_lock);

        schedule_work(&local->set_tim_queue);

        return 0;