/*

  Broadcom B43 wireless driver

  Copyright (c) 2005 Martin Langer <martin-langer@gmx.de>
  Copyright (c) 2005 Stefano Brivio <stefano.brivio@polimi.it>
  Copyright (c) 2005, 2006 Michael Buesch <mb@bu3sch.de>
  Copyright (c) 2005 Danny van Dyk <kugelfang@gentoo.org>
  Copyright (c) 2005 Andreas Jaggi <andreas.jaggi@waterwave.ch>

  Some parts of the code in this file are derived from the ipw2200
  driver  Copyright(c) 2003 - 2004 Intel Corporation.

  This program is free software; you can redistribute it and/or modify
  it under the terms of the GNU General Public License as published by
  the Free Software Foundation; either version 2 of the License, or
  (at your option) any later version.

  This program is distributed in the hope that it will be useful,
  but WITHOUT ANY WARRANTY; without even the implied warranty of
  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  GNU General Public License for more details.

  You should have received a copy of the GNU General Public License
  along with this program; see the file COPYING.  If not, write to
  the Free Software Foundation, Inc., 51 Franklin Steet, Fifth Floor,
  Boston, MA 02110-1301, USA.

*/

#include <linux/delay.h>
#include <linux/init.h>
#include <linux/moduleparam.h>
#include <linux/if_arp.h>
#include <linux/etherdevice.h>
#include <linux/firmware.h>
#include <linux/wireless.h>
#include <linux/workqueue.h>
#include <linux/skbuff.h>
#include <linux/io.h>
#include <linux/dma-mapping.h>
#include <asm/unaligned.h>

#include "b43.h"
#include "main.h"
#include "debugfs.h"
#include "phy_common.h"
#include "phy_g.h"
#include "phy_n.h"
#include "dma.h"
#include "pio.h"
#include "sysfs.h"
#include "xmit.h"
#include "lo.h"
#include "pcmcia.h"

MODULE_DESCRIPTION("Broadcom B43 wireless driver");
MODULE_AUTHOR("Martin Langer");
MODULE_AUTHOR("Stefano Brivio");
MODULE_AUTHOR("Michael Buesch");
MODULE_LICENSE("GPL");

MODULE_FIRMWARE(B43_SUPPORTED_FIRMWARE_ID);


static int modparam_bad_frames_preempt;
module_param_named(bad_frames_preempt, modparam_bad_frames_preempt, int, 0444);
MODULE_PARM_DESC(bad_frames_preempt,
                 "enable(1) / disable(0) Bad Frames Preemption");

static char modparam_fwpostfix[16];
module_param_string(fwpostfix, modparam_fwpostfix, 16, 0444);
MODULE_PARM_DESC(fwpostfix, "Postfix for the .fw files to load.");

static int modparam_hwpctl;
module_param_named(hwpctl, modparam_hwpctl, int, 0444);
MODULE_PARM_DESC(hwpctl, "Enable hardware-side power control (default off)");

static int modparam_nohwcrypt;
module_param_named(nohwcrypt, modparam_nohwcrypt, int, 0444);
MODULE_PARM_DESC(nohwcrypt, "Disable hardware encryption.");

int b43_modparam_qos = 1;
module_param_named(qos, b43_modparam_qos, int, 0444);
MODULE_PARM_DESC(qos, "Enable QOS support (default on)");

static int modparam_btcoex = 1;
module_param_named(btcoex, modparam_btcoex, int, 0444);
MODULE_PARM_DESC(btcoex, "Enable Bluetooth coexistance (default on)");


static const struct ssb_device_id b43_ssb_tbl[] = {
        SSB_DEVICE(SSB_VENDOR_BROADCOM, SSB_DEV_80211, 5),
        SSB_DEVICE(SSB_VENDOR_BROADCOM, SSB_DEV_80211, 6),
        SSB_DEVICE(SSB_VENDOR_BROADCOM, SSB_DEV_80211, 7),
        SSB_DEVICE(SSB_VENDOR_BROADCOM, SSB_DEV_80211, 9),
        SSB_DEVICE(SSB_VENDOR_BROADCOM, SSB_DEV_80211, 10),
        SSB_DEVICE(SSB_VENDOR_BROADCOM, SSB_DEV_80211, 11),
        SSB_DEVICE(SSB_VENDOR_BROADCOM, SSB_DEV_80211, 13),
        SSB_DEVTABLE_END
};

MODULE_DEVICE_TABLE(ssb, b43_ssb_tbl);

/* Channel and ratetables are shared for all devices.
 * They can't be const, because ieee80211 puts some precalculated
 * data in there. This data is the same for all devices, so we don't
 * get concurrency issues */
#define RATETAB_ENT(_rateid, _flags) \
        {                                                               \
                .bitrate        = B43_RATE_TO_BASE100KBPS(_rateid),     \
                .hw_value       = (_rateid),                            \
                .flags          = (_flags),                             \
        }

/*
 * NOTE: When changing this, sync with xmit.c's
 *       b43_plcp_get_bitrate_idx_* functions!
 */
static struct ieee80211_rate __b43_ratetable[] = {
        RATETAB_ENT(B43_CCK_RATE_1MB, 0),
        RATETAB_ENT(B43_CCK_RATE_2MB, IEEE80211_RATE_SHORT_PREAMBLE),
        RATETAB_ENT(B43_CCK_RATE_5MB, IEEE80211_RATE_SHORT_PREAMBLE),
        RATETAB_ENT(B43_CCK_RATE_11MB, IEEE80211_RATE_SHORT_PREAMBLE),
        RATETAB_ENT(B43_OFDM_RATE_6MB, 0),
        RATETAB_ENT(B43_OFDM_RATE_9MB, 0),
        RATETAB_ENT(B43_OFDM_RATE_12MB, 0),
        RATETAB_ENT(B43_OFDM_RATE_18MB, 0),
        RATETAB_ENT(B43_OFDM_RATE_24MB, 0),
        RATETAB_ENT(B43_OFDM_RATE_36MB, 0),
        RATETAB_ENT(B43_OFDM_RATE_48MB, 0),
        RATETAB_ENT(B43_OFDM_RATE_54MB, 0),
};

#define b43_a_ratetable         (__b43_ratetable + 4)
#define b43_a_ratetable_size    8
#define b43_b_ratetable         (__b43_ratetable + 0)
#define b43_b_ratetable_size    4
#define b43_g_ratetable         (__b43_ratetable + 0)
#define b43_g_ratetable_size    12

#define CHAN4G(_channel, _freq, _flags) {                       \
        .band                   = IEEE80211_BAND_2GHZ,          \
        .center_freq            = (_freq),                      \
        .hw_value               = (_channel),                   \
        .flags                  = (_flags),                     \
        .max_antenna_gain       = 0,                            \
        .max_power              = 30,                           \
}
static struct ieee80211_channel b43_2ghz_chantable[] = {
        CHAN4G(1, 2412, 0),
        CHAN4G(2, 2417, 0),
        CHAN4G(3, 2422, 0),
        CHAN4G(4, 2427, 0),
        CHAN4G(5, 2432, 0),
        CHAN4G(6, 2437, 0),
        CHAN4G(7, 2442, 0),
        CHAN4G(8, 2447, 0),
        CHAN4G(9, 2452, 0),
        CHAN4G(10, 2457, 0),
        CHAN4G(11, 2462, 0),
        CHAN4G(12, 2467, 0),
        CHAN4G(13, 2472, 0),
        CHAN4G(14, 2484, 0),
};
#undef CHAN4G

#define CHAN5G(_channel, _flags) {                              \
        .band                   = IEEE80211_BAND_5GHZ,          \
        .center_freq            = 5000 + (5 * (_channel)),      \
        .hw_value               = (_channel),                   \
        .flags                  = (_flags),                     \
        .max_antenna_gain       = 0,                            \
        .max_power              = 30,                           \
}
static struct ieee80211_channel b43_5ghz_nphy_chantable[] = {
        CHAN5G(32, 0),          CHAN5G(34, 0),
        CHAN5G(36, 0),          CHAN5G(38, 0),
        CHAN5G(40, 0),          CHAN5G(42, 0),
        CHAN5G(44, 0),          CHAN5G(46, 0),
        CHAN5G(48, 0),          CHAN5G(50, 0),
        CHAN5G(52, 0),          CHAN5G(54, 0),
        CHAN5G(56, 0),          CHAN5G(58, 0),
        CHAN5G(60, 0),          CHAN5G(62, 0),
        CHAN5G(64, 0),          CHAN5G(66, 0),
        CHAN5G(68, 0),          CHAN5G(70, 0),
        CHAN5G(72, 0),          CHAN5G(74, 0),
        CHAN5G(76, 0),          CHAN5G(78, 0),
        CHAN5G(80, 0),          CHAN5G(82, 0),
        CHAN5G(84, 0),          CHAN5G(86, 0),
        CHAN5G(88, 0),          CHAN5G(90, 0),
        CHAN5G(92, 0),          CHAN5G(94, 0),
        CHAN5G(96, 0),          CHAN5G(98, 0),
        CHAN5G(100, 0),         CHAN5G(102, 0),
        CHAN5G(104, 0),         CHAN5G(106, 0),
        CHAN5G(108, 0),         CHAN5G(110, 0),
        CHAN5G(112, 0),         CHAN5G(114, 0),
        CHAN5G(116, 0),         CHAN5G(118, 0),
        CHAN5G(120, 0),         CHAN5G(122, 0),
        CHAN5G(124, 0),         CHAN5G(126, 0),
        CHAN5G(128, 0),         CHAN5G(130, 0),
        CHAN5G(132, 0),         CHAN5G(134, 0),
        CHAN5G(136, 0),         CHAN5G(138, 0),
        CHAN5G(140, 0),         CHAN5G(142, 0),
        CHAN5G(144, 0),         CHAN5G(145, 0),
        CHAN5G(146, 0),         CHAN5G(147, 0),
        CHAN5G(148, 0),         CHAN5G(149, 0),
        CHAN5G(150, 0),         CHAN5G(151, 0),
        CHAN5G(152, 0),         CHAN5G(153, 0),
        CHAN5G(154, 0),         CHAN5G(155, 0),
        CHAN5G(156, 0),         CHAN5G(157, 0),
        CHAN5G(158, 0),         CHAN5G(159, 0),
        CHAN5G(160, 0),         CHAN5G(161, 0),
        CHAN5G(162, 0),         CHAN5G(163, 0),
        CHAN5G(164, 0),         CHAN5G(165, 0),
        CHAN5G(166, 0),         CHAN5G(168, 0),
        CHAN5G(170, 0),         CHAN5G(172, 0),
        CHAN5G(174, 0),         CHAN5G(176, 0),
        CHAN5G(178, 0),         CHAN5G(180, 0),
        CHAN5G(182, 0),         CHAN5G(184, 0),
        CHAN5G(186, 0),         CHAN5G(188, 0),
        CHAN5G(190, 0),         CHAN5G(192, 0),
        CHAN5G(194, 0),         CHAN5G(196, 0),
        CHAN5G(198, 0),         CHAN5G(200, 0),
        CHAN5G(202, 0),         CHAN5G(204, 0),
        CHAN5G(206, 0),         CHAN5G(208, 0),
        CHAN5G(210, 0),         CHAN5G(212, 0),
        CHAN5G(214, 0),         CHAN5G(216, 0),
        CHAN5G(218, 0),         CHAN5G(220, 0),
        CHAN5G(222, 0),         CHAN5G(224, 0),
        CHAN5G(226, 0),         CHAN5G(228, 0),
};

static struct ieee80211_channel b43_5ghz_aphy_chantable[] = {
        CHAN5G(34, 0),          CHAN5G(36, 0),
        CHAN5G(38, 0),          CHAN5G(40, 0),
        CHAN5G(42, 0),          CHAN5G(44, 0),
        CHAN5G(46, 0),          CHAN5G(48, 0),
        CHAN5G(52, 0),          CHAN5G(56, 0),
        CHAN5G(60, 0),          CHAN5G(64, 0),
        CHAN5G(100, 0),         CHAN5G(104, 0),
        CHAN5G(108, 0),         CHAN5G(112, 0),
        CHAN5G(116, 0),         CHAN5G(120, 0),
        CHAN5G(124, 0),         CHAN5G(128, 0),
        CHAN5G(132, 0),         CHAN5G(136, 0),
        CHAN5G(140, 0),         CHAN5G(149, 0),
        CHAN5G(153, 0),         CHAN5G(157, 0),
        CHAN5G(161, 0),         CHAN5G(165, 0),
        CHAN5G(184, 0),         CHAN5G(188, 0),
        CHAN5G(192, 0),         CHAN5G(196, 0),
        CHAN5G(200, 0),         CHAN5G(204, 0),
        CHAN5G(208, 0),         CHAN5G(212, 0),
        CHAN5G(216, 0),
};
#undef CHAN5G

static struct ieee80211_supported_band b43_band_5GHz_nphy = {
        .band           = IEEE80211_BAND_5GHZ,
        .channels       = b43_5ghz_nphy_chantable,
        .n_channels     = ARRAY_SIZE(b43_5ghz_nphy_chantable),
        .bitrates       = b43_a_ratetable,
        .n_bitrates     = b43_a_ratetable_size,
};

static struct ieee80211_supported_band b43_band_5GHz_aphy = {
        .band           = IEEE80211_BAND_5GHZ,
        .channels       = b43_5ghz_aphy_chantable,
        .n_channels     = ARRAY_SIZE(b43_5ghz_aphy_chantable),
        .bitrates       = b43_a_ratetable,
        .n_bitrates     = b43_a_ratetable_size,
};

static struct ieee80211_supported_band b43_band_2GHz = {
        .band           = IEEE80211_BAND_2GHZ,
        .channels       = b43_2ghz_chantable,
        .n_channels     = ARRAY_SIZE(b43_2ghz_chantable),
        .bitrates       = b43_g_ratetable,
        .n_bitrates     = b43_g_ratetable_size,
};

static void b43_wireless_core_exit(struct b43_wldev *dev);
static int b43_wireless_core_init(struct b43_wldev *dev);
static void b43_wireless_core_stop(struct b43_wldev *dev);
static int b43_wireless_core_start(struct b43_wldev *dev);

static int b43_ratelimit(struct b43_wl *wl)
{
        if (!wl || !wl->current_dev)
                return 1;
        if (b43_status(wl->current_dev) < B43_STAT_STARTED)
                return 1;
        /* We are up and running.
         * Ratelimit the messages to avoid DoS over the net. */
        return net_ratelimit();
}

void b43info(struct b43_wl *wl, const char *fmt, ...)
{
        va_list args;

        if (!b43_ratelimit(wl))
                return;
        va_start(args, fmt);
        printk(KERN_INFO "b43-%s: ",
               (wl && wl->hw) ? wiphy_name(wl->hw->wiphy) : "wlan");
        vprintk(fmt, args);
        va_end(args);
}

void b43err(struct b43_wl *wl, const char *fmt, ...)
{
        va_list args;

        if (!b43_ratelimit(wl))
                return;
        va_start(args, fmt);
        printk(KERN_ERR "b43-%s ERROR: ",
               (wl && wl->hw) ? wiphy_name(wl->hw->wiphy) : "wlan");
        vprintk(fmt, args);
        va_end(args);
}

void b43warn(struct b43_wl *wl, const char *fmt, ...)
{
        va_list args;

        if (!b43_ratelimit(wl))
                return;
        va_start(args, fmt);
        printk(KERN_WARNING "b43-%s warning: ",
               (wl && wl->hw) ? wiphy_name(wl->hw->wiphy) : "wlan");
        vprintk(fmt, args);
        va_end(args);
}

#if B43_DEBUG
void b43dbg(struct b43_wl *wl, const char *fmt, ...)
{
        va_list args;

        va_start(args, fmt);
        printk(KERN_DEBUG "b43-%s debug: ",
               (wl && wl->hw) ? wiphy_name(wl->hw->wiphy) : "wlan");
        vprintk(fmt, args);
        va_end(args);
}
#endif /* DEBUG */

static void b43_ram_write(struct b43_wldev *dev, u16 offset, u32 val)
{
        u32 macctl;

        B43_WARN_ON(offset % 4 != 0);

        macctl = b43_read32(dev, B43_MMIO_MACCTL);
        if (macctl & B43_MACCTL_BE)
                val = swab32(val);

        b43_write32(dev, B43_MMIO_RAM_CONTROL, offset);
        mmiowb();
        b43_write32(dev, B43_MMIO_RAM_DATA, val);
}

static inline void b43_shm_control_word(struct b43_wldev *dev,
                                        u16 routing, u16 offset)
{
        u32 control;

        /* "offset" is the WORD offset. */
        control = routing;
        control <<= 16;
        control |= offset;
        b43_write32(dev, B43_MMIO_SHM_CONTROL, control);
}

u32 __b43_shm_read32(struct b43_wldev *dev, u16 routing, u16 offset)
{
        u32 ret;

        if (routing == B43_SHM_SHARED) {
                B43_WARN_ON(offset & 0x0001);
                if (offset & 0x0003) {
                        /* Unaligned access */
                        b43_shm_control_word(dev, routing, offset >> 2);
                        ret = b43_read16(dev, B43_MMIO_SHM_DATA_UNALIGNED);
                        ret <<= 16;
                        b43_shm_control_word(dev, routing, (offset >> 2) + 1);
                        ret |= b43_read16(dev, B43_MMIO_SHM_DATA);

                        goto out;
                }
                offset >>= 2;
        }
        b43_shm_control_word(dev, routing, offset);
        ret = b43_read32(dev, B43_MMIO_SHM_DATA);
out:
        return ret;
}

u32 b43_shm_read32(struct b43_wldev *dev, u16 routing, u16 offset)
{
        struct b43_wl *wl = dev->wl;
        unsigned long flags;
        u32 ret;

        spin_lock_irqsave(&wl->shm_lock, flags);
        ret = __b43_shm_read32(dev, routing, offset);
        spin_unlock_irqrestore(&wl->shm_lock, flags);

        return ret;
}

u16 __b43_shm_read16(struct b43_wldev *dev, u16 routing, u16 offset)
{
        u16 ret;

        if (routing == B43_SHM_SHARED) {
                B43_WARN_ON(offset & 0x0001);
                if (offset & 0x0003) {
                        /* Unaligned access */
                        b43_shm_control_word(dev, routing, offset >> 2);
                        ret = b43_read16(dev, B43_MMIO_SHM_DATA_UNALIGNED);

                        goto out;
                }
                offset >>= 2;
        }
        b43_shm_control_word(dev, routing, offset);
        ret = b43_read16(dev, B43_MMIO_SHM_DATA);
out:
        return ret;
}

u16 b43_shm_read16(struct b43_wldev *dev, u16 routing, u16 offset)
{
        struct b43_wl *wl = dev->wl;
        unsigned long flags;
        u16 ret;

        spin_lock_irqsave(&wl->shm_lock, flags);
        ret = __b43_shm_read16(dev, routing, offset);
        spin_unlock_irqrestore(&wl->shm_lock, flags);

        return ret;
}

void __b43_shm_write32(struct b43_wldev *dev, u16 routing, u16 offset, u32 value)
{
        if (routing == B43_SHM_SHARED) {
                B43_WARN_ON(offset & 0x0001);
                if (offset & 0x0003) {
                        /* Unaligned access */
                        b43_shm_control_word(dev, routing, offset >> 2);
                        b43_write16(dev, B43_MMIO_SHM_DATA_UNALIGNED,
                                    (value >> 16) & 0xffff);
                        b43_shm_control_word(dev, routing, (offset >> 2) + 1);
                        b43_write16(dev, B43_MMIO_SHM_DATA, value & 0xffff);
                        return;
                }
                offset >>= 2;
        }
        b43_shm_control_word(dev, routing, offset);
        b43_write32(dev, B43_MMIO_SHM_DATA, value);
}

void b43_shm_write32(struct b43_wldev *dev, u16 routing, u16 offset, u32 value)
{
        struct b43_wl *wl = dev->wl;
        unsigned long flags;

        spin_lock_irqsave(&wl->shm_lock, flags);
        __b43_shm_write32(dev, routing, offset, value);
        spin_unlock_irqrestore(&wl->shm_lock, flags);
}

void __b43_shm_write16(struct b43_wldev *dev, u16 routing, u16 offset, u16 value)
{
        if (routing == B43_SHM_SHARED) {
                B43_WARN_ON(offset & 0x0001);
                if (offset & 0x0003) {
                        /* Unaligned access */
                        b43_shm_control_word(dev, routing, offset >> 2);
                        b43_write16(dev, B43_MMIO_SHM_DATA_UNALIGNED, value);
                        return;
                }
                offset >>= 2;
        }
        b43_shm_control_word(dev, routing, offset);
        b43_write16(dev, B43_MMIO_SHM_DATA, value);
}

void b43_shm_write16(struct b43_wldev *dev, u16 routing, u16 offset, u16 value)
{
        struct b43_wl *wl = dev->wl;
        unsigned long flags;

        spin_lock_irqsave(&wl->shm_lock, flags);
        __b43_shm_write16(dev, routing, offset, value);
        spin_unlock_irqrestore(&wl->shm_lock, flags);
}

/* Read HostFlags */
u64 b43_hf_read(struct b43_wldev * dev)
{
        u64 ret;

        ret = b43_shm_read16(dev, B43_SHM_SHARED, B43_SHM_SH_HOSTFHI);
        ret <<= 16;
        ret |= b43_shm_read16(dev, B43_SHM_SHARED, B43_SHM_SH_HOSTFMI);
        ret <<= 16;
        ret |= b43_shm_read16(dev, B43_SHM_SHARED, B43_SHM_SH_HOSTFLO);

        return ret;
}

/* Write HostFlags */
void b43_hf_write(struct b43_wldev *dev, u64 value)
{
        u16 lo, mi, hi;

        lo = (value & 0x00000000FFFFULL);
        mi = (value & 0x0000FFFF0000ULL) >> 16;
        hi = (value & 0xFFFF00000000ULL) >> 32;
        b43_shm_write16(dev, B43_SHM_SHARED, B43_SHM_SH_HOSTFLO, lo);
        b43_shm_write16(dev, B43_SHM_SHARED, B43_SHM_SH_HOSTFMI, mi);
        b43_shm_write16(dev, B43_SHM_SHARED, B43_SHM_SH_HOSTFHI, hi);
}

void b43_tsf_read(struct b43_wldev *dev, u64 * tsf)
{
        /* We need to be careful. As we read the TSF from multiple
         * registers, we should take care of register overflows.
         * In theory, the whole tsf read process should be atomic.
         * We try to be atomic here, by restaring the read process,
         * if any of the high registers changed (overflew).
         */
        if (dev->dev->id.revision >= 3) {
                u32 low, high, high2;

                do {
                        high = b43_read32(dev, B43_MMIO_REV3PLUS_TSF_HIGH);
                        low = b43_read32(dev, B43_MMIO_REV3PLUS_TSF_LOW);
                        high2 = b43_read32(dev, B43_MMIO_REV3PLUS_TSF_HIGH);
                } while (unlikely(high != high2));

                *tsf = high;
                *tsf <<= 32;
                *tsf |= low;
        } else {
                u64 tmp;
                u16 v0, v1, v2, v3;
                u16 test1, test2, test3;

                do {
                        v3 = b43_read16(dev, B43_MMIO_TSF_3);
                        v2 = b43_read16(dev, B43_MMIO_TSF_2);
                        v1 = b43_read16(dev, B43_MMIO_TSF_1);
                        v0 = b43_read16(dev, B43_MMIO_TSF_0);

                        test3 = b43_read16(dev, B43_MMIO_TSF_3);
                        test2 = b43_read16(dev, B43_MMIO_TSF_2);
                        test1 = b43_read16(dev, B43_MMIO_TSF_1);
                } while (v3 != test3 || v2 != test2 || v1 != test1);

                *tsf = v3;
                *tsf <<= 48;
                tmp = v2;
                tmp <<= 32;
                *tsf |= tmp;
                tmp = v1;
                tmp <<= 16;
                *tsf |= tmp;
                *tsf |= v0;
        }
}

static void b43_time_lock(struct b43_wldev *dev)
{
        u32 macctl;

        macctl = b43_read32(dev, B43_MMIO_MACCTL);
        macctl |= B43_MACCTL_TBTTHOLD;
        b43_write32(dev, B43_MMIO_MACCTL, macctl);
        /* Commit the write */
        b43_read32(dev, B43_MMIO_MACCTL);
}

static void b43_time_unlock(struct b43_wldev *dev)
{
        u32 macctl;

        macctl = b43_read32(dev, B43_MMIO_MACCTL);
        macctl &= ~B43_MACCTL_TBTTHOLD;
        b43_write32(dev, B43_MMIO_MACCTL, macctl);
        /* Commit the write */
        b43_read32(dev, B43_MMIO_MACCTL);
}

static void b43_tsf_write_locked(struct b43_wldev *dev, u64 tsf)
{
        /* Be careful with the in-progress timer.
         * First zero out the low register, so we have a full
         * register-overflow duration to complete the operation.
         */
        if (dev->dev->id.revision >= 3) {
                u32 lo = (tsf & 0x00000000FFFFFFFFULL);
                u32 hi = (tsf & 0xFFFFFFFF00000000ULL) >> 32;

                b43_write32(dev, B43_MMIO_REV3PLUS_TSF_LOW, 0);
                mmiowb();
                b43_write32(dev, B43_MMIO_REV3PLUS_TSF_HIGH, hi);
                mmiowb();
                b43_write32(dev, B43_MMIO_REV3PLUS_TSF_LOW, lo);
        } else {
                u16 v0 = (tsf & 0x000000000000FFFFULL);
                u16 v1 = (tsf & 0x00000000FFFF0000ULL) >> 16;
                u16 v2 = (tsf & 0x0000FFFF00000000ULL) >> 32;
                u16 v3 = (tsf & 0xFFFF000000000000ULL) >> 48;

                b43_write16(dev, B43_MMIO_TSF_0, 0);
                mmiowb();
                b43_write16(dev, B43_MMIO_TSF_3, v3);
                mmiowb();
                b43_write16(dev, B43_MMIO_TSF_2, v2);
                mmiowb();
                b43_write16(dev, B43_MMIO_TSF_1, v1);
                mmiowb();
                b43_write16(dev, B43_MMIO_TSF_0, v0);
        }
}

void b43_tsf_write(struct b43_wldev *dev, u64 tsf)
{
        b43_time_lock(dev);
        b43_tsf_write_locked(dev, tsf);
        b43_time_unlock(dev);
}

static
void b43_macfilter_set(struct b43_wldev *dev, u16 offset, const u8 * mac)
{
        static const u8 zero_addr[ETH_ALEN] = { 0 };
        u16 data;

        if (!mac)
                mac = zero_addr;

        offset |= 0x0020;
        b43_write16(dev, B43_MMIO_MACFILTER_CONTROL, offset);

        data = mac[0];
        data |= mac[1] << 8;
        b43_write16(dev, B43_MMIO_MACFILTER_DATA, data);
        data = mac[2];
        data |= mac[3] << 8;
        b43_write16(dev, B43_MMIO_MACFILTER_DATA, data);
        data = mac[4];
        data |= mac[5] << 8;
        b43_write16(dev, B43_MMIO_MACFILTER_DATA, data);
}

static void b43_write_mac_bssid_templates(struct b43_wldev *dev)
{
        const u8 *mac;
        const u8 *bssid;
        u8 mac_bssid[ETH_ALEN * 2];
        int i;
        u32 tmp;

        bssid = dev->wl->bssid;
        mac = dev->wl->mac_addr;

        b43_macfilter_set(dev, B43_MACFILTER_BSSID, bssid);

        memcpy(mac_bssid, mac, ETH_ALEN);
        memcpy(mac_bssid + ETH_ALEN, bssid, ETH_ALEN);

        /* Write our MAC address and BSSID to template ram */
        for (i = 0; i < ARRAY_SIZE(mac_bssid); i += sizeof(u32)) {
                tmp = (u32) (mac_bssid[i + 0]);
                tmp |= (u32) (mac_bssid[i + 1]) << 8;
                tmp |= (u32) (mac_bssid[i + 2]) << 16;
                tmp |= (u32) (mac_bssid[i + 3]) << 24;
                b43_ram_write(dev, 0x20 + i, tmp);
        }
}

static void b43_upload_card_macaddress(struct b43_wldev *dev)
{
        b43_write_mac_bssid_templates(dev);
        b43_macfilter_set(dev, B43_MACFILTER_SELF, dev->wl->mac_addr);
}

static void b43_set_slot_time(struct b43_wldev *dev, u16 slot_time)
{
        /* slot_time is in usec. */
        if (dev->phy.type != B43_PHYTYPE_G)
                return;
        b43_write16(dev, 0x684, 510 + slot_time);
        b43_shm_write16(dev, B43_SHM_SHARED, 0x0010, slot_time);
}

static void b43_short_slot_timing_enable(struct b43_wldev *dev)
{
        b43_set_slot_time(dev, 9);
        dev->short_slot = 1;
}

static void b43_short_slot_timing_disable(struct b43_wldev *dev)
{
        b43_set_slot_time(dev, 20);
        dev->short_slot = 0;
}

/* Enable a Generic IRQ. "mask" is the mask of which IRQs to enable.
 * Returns the _previously_ enabled IRQ mask.
 */
static inline u32 b43_interrupt_enable(struct b43_wldev *dev, u32 mask)
{
        u32 old_mask;

        old_mask = b43_read32(dev, B43_MMIO_GEN_IRQ_MASK);
        b43_write32(dev, B43_MMIO_GEN_IRQ_MASK, old_mask | mask);

        return old_mask;
}

/* Disable a Generic IRQ. "mask" is the mask of which IRQs to disable.
 * Returns the _previously_ enabled IRQ mask.
 */
static inline u32 b43_interrupt_disable(struct b43_wldev *dev, u32 mask)
{
        u32 old_mask;

        old_mask = b43_read32(dev, B43_MMIO_GEN_IRQ_MASK);
        b43_write32(dev, B43_MMIO_GEN_IRQ_MASK, old_mask & ~mask);

        return old_mask;
}

/* Synchronize IRQ top- and bottom-half.
 * IRQs must be masked before calling this.
 * This must not be called with the irq_lock held.
 */
static void b43_synchronize_irq(struct b43_wldev *dev)
{
        synchronize_irq(dev->dev->irq);
        tasklet_kill(&dev->isr_tasklet);
}

/* DummyTransmission function, as documented on
 * http://bcm-specs.sipsolutions.net/DummyTransmission
 */
void b43_dummy_transmission(struct b43_wldev *dev)
{
        struct b43_wl *wl = dev->wl;
        struct b43_phy *phy = &dev->phy;
        unsigned int i, max_loop;
        u16 value;
        u32 buffer[5] = {
                0x00000000,
                0x00D40000,
                0x00000000,
                0x01000000,
                0x00000000,
        };

        switch (phy->type) {
        case B43_PHYTYPE_A:
                max_loop = 0x1E;
                buffer[0] = 0x000201CC;
                break;
        case B43_PHYTYPE_B:
        case B43_PHYTYPE_G:
                max_loop = 0xFA;
                buffer[0] = 0x000B846E;
                break;
        default:
                B43_WARN_ON(1);
                return;
        }

        spin_lock_irq(&wl->irq_lock);
        write_lock(&wl->tx_lock);

        for (i = 0; i < 5; i++)
                b43_ram_write(dev, i * 4, buffer[i]);

        /* Commit writes */
        b43_read32(dev, B43_MMIO_MACCTL);

        b43_write16(dev, 0x0568, 0x0000);
        b43_write16(dev, 0x07C0, 0x0000);
        value = ((phy->type == B43_PHYTYPE_A) ? 1 : 0);
        b43_write16(dev, 0x050C, value);
        b43_write16(dev, 0x0508, 0x0000);
        b43_write16(dev, 0x050A, 0x0000);
        b43_write16(dev, 0x054C, 0x0000);
        b43_write16(dev, 0x056A, 0x0014);
        b43_write16(dev, 0x0568, 0x0826);
        b43_write16(dev, 0x0500, 0x0000);
        b43_write16(dev, 0x0502, 0x0030);

        if (phy->radio_ver == 0x2050 && phy->radio_rev <= 0x5)
                b43_radio_write16(dev, 0x0051, 0x0017);
        for (i = 0x00; i < max_loop; i++) {
                value = b43_read16(dev, 0x050E);
                if (value & 0x0080)
                        break;
                udelay(10);
        }
        for (i = 0x00; i < 0x0A; i++) {
                value = b43_read16(dev, 0x050E);
                if (value & 0x0400)
                        break;
                udelay(10);
        }
        for (i = 0x00; i < 0x19; i++) {
                value = b43_read16(dev, 0x0690);
                if (!(value & 0x0100))
                        break;
                udelay(10);
        }
        if (phy->radio_ver == 0x2050 && phy->radio_rev <= 0x5)
                b43_radio_write16(dev, 0x0051, 0x0037);

        write_unlock(&wl->tx_lock);
        spin_unlock_irq(&wl->irq_lock);
}

static void key_write(struct b43_wldev *dev,
                      u8 index, u8 algorithm, const u8 * key)
{
        unsigned int i;
        u32 offset;
        u16 value;
        u16 kidx;

        /* Key index/algo block */
        kidx = b43_kidx_to_fw(dev, index);
        value = ((kidx << 4) | algorithm);
        b43_shm_write16(dev, B43_SHM_SHARED,
                        B43_SHM_SH_KEYIDXBLOCK + (kidx * 2), value);

        /* Write the key to the Key Table Pointer offset */
        offset = dev->ktp + (index * B43_SEC_KEYSIZE);
        for (i = 0; i < B43_SEC_KEYSIZE; i += 2) {
                value = key[i];
                value |= (u16) (key[i + 1]) << 8;
                b43_shm_write16(dev, B43_SHM_SHARED, offset + i, value);
        }
}

static void keymac_write(struct b43_wldev *dev, u8 index, const u8 * addr)
{
        u32 addrtmp[2] = { 0, 0, };
        u8 per_sta_keys_start = 8;

        if (b43_new_kidx_api(dev))
                per_sta_keys_start = 4;

        B43_WARN_ON(index < per_sta_keys_start);
        /* We have two default TX keys and possibly two default RX keys.
         * Physical mac 0 is mapped to physical key 4 or 8, depending
         * on the firmware version.
         * So we must adjust the index here.
         */
        index -= per_sta_keys_start;

        if (addr) {
                addrtmp[0] = addr[0];
                addrtmp[0] |= ((u32) (addr[1]) << 8);
                addrtmp[0] |= ((u32) (addr[2]) << 16);
                addrtmp[0] |= ((u32) (addr[3]) << 24);
                addrtmp[1] = addr[4];
                addrtmp[1] |= ((u32) (addr[5]) << 8);
        }

        if (dev->dev->id.revision >= 5) {
                /* Receive match transmitter address mechanism */
                b43_shm_write32(dev, B43_SHM_RCMTA,
                                (index * 2) + 0, addrtmp[0]);
                b43_shm_write16(dev, B43_SHM_RCMTA,
                                (index * 2) + 1, addrtmp[1]);
        } else {
                /* RXE (Receive Engine) and
                 * PSM (Programmable State Machine) mechanism
                 */
                if (index < 8) {
                        /* TODO write to RCM 16, 19, 22 and 25 */
                } else {
                        b43_shm_write32(dev, B43_SHM_SHARED,
                                        B43_SHM_SH_PSM + (index * 6) + 0,
                                        addrtmp[0]);
                        b43_shm_write16(dev, B43_SHM_SHARED,
                                        B43_SHM_SH_PSM + (index * 6) + 4,
                                        addrtmp[1]);
                }
        }
}

static void do_key_write(struct b43_wldev *dev,
                         u8 index, u8 algorithm,
                         const u8 * key, size_t key_len, const u8 * mac_addr)
{
        u8 buf[B43_SEC_KEYSIZE] = { 0, };
        u8 per_sta_keys_start = 8;

        if (b43_new_kidx_api(dev))
                per_sta_keys_start = 4;

        B43_WARN_ON(index >= dev->max_nr_keys);
        B43_WARN_ON(key_len > B43_SEC_KEYSIZE);

        if (index >= per_sta_keys_start)
                keymac_write(dev, index, NULL); /* First zero out mac. */
        if (key)
                memcpy(buf, key, key_len);
        key_write(dev, index, algorithm, buf);
        if (index >= per_sta_keys_start)
                keymac_write(dev, index, mac_addr);

        dev->key[index].algorithm = algorithm;
}

static int b43_key_write(struct b43_wldev *dev,
                         int index, u8 algorithm,
                         const u8 * key, size_t key_len,
                         const u8 * mac_addr,
                         struct ieee80211_key_conf *keyconf)
{
        int i;
        int sta_keys_start;

        if (key_len > B43_SEC_KEYSIZE)
                return -EINVAL;
        for (i = 0; i < dev->max_nr_keys; i++) {
                /* Check that we don't already have this key. */
                B43_WARN_ON(dev->key[i].keyconf == keyconf);
        }
        if (index < 0) {
                /* Either pairwise key or address is 00:00:00:00:00:00
                 * for transmit-only keys. Search the index. */
                if (b43_new_kidx_api(dev))
                        sta_keys_start = 4;
                else
                        sta_keys_start = 8;
                for (i = sta_keys_start; i < dev->max_nr_keys; i++) {
                        if (!dev->key[i].keyconf) {
                                /* found empty */
                                index = i;
                                break;
                        }
                }
                if (index < 0) {
                        b43err(dev->wl, "Out of hardware key memory\n");
                        return -ENOSPC;
                }
        } else
                B43_WARN_ON(index > 3);

        do_key_write(dev, index, algorithm, key, key_len, mac_addr);
        if ((index <= 3) && !b43_new_kidx_api(dev)) {
                /* Default RX key */
                B43_WARN_ON(mac_addr);
                do_key_write(dev, index + 4, algorithm, key, key_len, NULL);
        }
        keyconf->hw_key_idx = index;
        dev->key[index].keyconf = keyconf;

        return 0;
}

static int b43_key_clear(struct b43_wldev *dev, int index)
{
        if (B43_WARN_ON((index < 0) || (index >= dev->max_nr_keys)))
                return -EINVAL;
        do_key_write(dev, index, B43_SEC_ALGO_NONE,
                     NULL, B43_SEC_KEYSIZE, NULL);
        if ((index <= 3) && !b43_new_kidx_api(dev)) {
                do_key_write(dev, index + 4, B43_SEC_ALGO_NONE,
                             NULL, B43_SEC_KEYSIZE, NULL);
        }
        dev->key[index].keyconf = NULL;

        return 0;
}

static void b43_clear_keys(struct b43_wldev *dev)
{
        int i;

        for (i = 0; i < dev->max_nr_keys; i++)
                b43_key_clear(dev, i);
}

void b43_power_saving_ctl_bits(struct b43_wldev *dev, unsigned int ps_flags)
{
        u32 macctl;
        u16 ucstat;

        bool hwps;
        bool awake;
        int i;

        B43_WARN_ON((ps_flags & B43_PS_ENABLED) &&
                    (ps_flags & B43_PS_DISABLED));
        B43_WARN_ON((ps_flags & B43_PS_AWAKE) && (ps_flags & B43_PS_ASLEEP));

        if (ps_flags & B43_PS_ENABLED) {
                hwps = 1;
        } else if (ps_flags & B43_PS_DISABLED) {
                hwps = 0;
        } else {
                //TODO: If powersave is not off and FIXME is not set and we are not in adhoc
                //      and thus is not an AP and we are associated, set bit 25
        }
        if (ps_flags & B43_PS_AWAKE) {
                awake = 1;
        } else if (ps_flags & B43_PS_ASLEEP) {
                awake = 0;
        } else {
                //TODO: If the device is awake or this is an AP, or we are scanning, or FIXME,
                //      or we are associated, or FIXME, or the latest PS-Poll packet sent was
                //      successful, set bit26
        }

/* FIXME: For now we force awake-on and hwps-off */
        hwps = 0;
        awake = 1;

        macctl = b43_read32(dev, B43_MMIO_MACCTL);
        if (hwps)
                macctl |= B43_MACCTL_HWPS;
        else
                macctl &= ~B43_MACCTL_HWPS;
        if (awake)
                macctl |= B43_MACCTL_AWAKE;
        else
                macctl &= ~B43_MACCTL_AWAKE;
        b43_write32(dev, B43_MMIO_MACCTL, macctl);
        /* Commit write */
        b43_read32(dev, B43_MMIO_MACCTL);
        if (awake && dev->dev->id.revision >= 5) {
                /* Wait for the microcode to wake up. */
                for (i = 0; i < 100; i++) {
                        ucstat = b43_shm_read16(dev, B43_SHM_SHARED,
                                                B43_SHM_SH_UCODESTAT);
                        if (ucstat != B43_SHM_SH_UCODESTAT_SLEEP)
                                break;
                        udelay(10);
                }
        }
}

void b43_wireless_core_reset(struct b43_wldev *dev, u32 flags)
{
        u32 tmslow;
        u32 macctl;

        flags |= B43_TMSLOW_PHYCLKEN;
        flags |= B43_TMSLOW_PHYRESET;
        ssb_device_enable(dev->dev, flags);
        msleep(2);              /* Wait for the PLL to turn on. */

        /* Now take the PHY out of Reset again */
        tmslow = ssb_read32(dev->dev, SSB_TMSLOW);
        tmslow |= SSB_TMSLOW_FGC;
        tmslow &= ~B43_TMSLOW_PHYRESET;
        ssb_write32(dev->dev, SSB_TMSLOW, tmslow);
        ssb_read32(dev->dev, SSB_TMSLOW);       /* flush */
        msleep(1);
        tmslow &= ~SSB_TMSLOW_FGC;
        ssb_write32(dev->dev, SSB_TMSLOW, tmslow);
        ssb_read32(dev->dev, SSB_TMSLOW);       /* flush */
        msleep(1);

        /* Turn Analog ON, but only if we already know the PHY-type.
         * This protects against very early setup where we don't know the
         * PHY-type, yet. wireless_core_reset will be called once again later,
         * when we know the PHY-type. */
        if (dev->phy.ops)
                dev->phy.ops->switch_analog(dev, 1);

        macctl = b43_read32(dev, B43_MMIO_MACCTL);
        macctl &= ~B43_MACCTL_GMODE;
        if (flags & B43_TMSLOW_GMODE)
                macctl |= B43_MACCTL_GMODE;
        macctl |= B43_MACCTL_IHR_ENABLED;
        b43_write32(dev, B43_MMIO_MACCTL, macctl);
}

static void handle_irq_transmit_status(struct b43_wldev *dev)
{
        u32 v0, v1;
        u16 tmp;
        struct b43_txstatus stat;

        while (1) {
                v0 = b43_read32(dev, B43_MMIO_XMITSTAT_0);
                if (!(v0 & 0x00000001))
                        break;
                v1 = b43_read32(dev, B43_MMIO_XMITSTAT_1);

                stat.cookie = (v0 >> 16);
                stat.seq = (v1 & 0x0000FFFF);
                stat.phy_stat = ((v1 & 0x00FF0000) >> 16);
                tmp = (v0 & 0x0000FFFF);
                stat.frame_count = ((tmp & 0xF000) >> 12);
                stat.rts_count = ((tmp & 0x0F00) >> 8);
                stat.supp_reason = ((tmp & 0x001C) >> 2);
                stat.pm_indicated = !!(tmp & 0x0080);
                stat.intermediate = !!(tmp & 0x0040);
                stat.for_ampdu = !!(tmp & 0x0020);
                stat.acked = !!(tmp & 0x0002);

                b43_handle_txstatus(dev, &stat);
        }
}

static void drain_txstatus_queue(struct b43_wldev *dev)
{
        u32 dummy;

        if (dev->dev->id.revision < 5)
                return;
        /* Read all entries from the microcode TXstatus FIFO
         * and throw them away.
         */
        while (1) {
                dummy = b43_read32(dev, B43_MMIO_XMITSTAT_0);
                if (!(dummy & 0x00000001))
                        break;
                dummy = b43_read32(dev, B43_MMIO_XMITSTAT_1);
        }
}

static u32 b43_jssi_read(struct b43_wldev *dev)
{
        u32 val = 0;

        val = b43_shm_read16(dev, B43_SHM_SHARED, 0x08A);
        val <<= 16;
        val |= b43_shm_read16(dev, B43_SHM_SHARED, 0x088);

        return val;
}

static void b43_jssi_write(struct b43_wldev *dev, u32 jssi)
{
        b43_shm_write16(dev, B43_SHM_SHARED, 0x088, (jssi & 0x0000FFFF));
        b43_shm_write16(dev, B43_SHM_SHARED, 0x08A, (jssi & 0xFFFF0000) >> 16);
}

static void b43_generate_noise_sample(struct b43_wldev *dev)
{
        b43_jssi_write(dev, 0x7F7F7F7F);
        b43_write32(dev, B43_MMIO_MACCMD,
                    b43_read32(dev, B43_MMIO_MACCMD) | B43_MACCMD_BGNOISE);
}

static void b43_calculate_link_quality(struct b43_wldev *dev)
{
        /* Top half of Link Quality calculation. */

        if (dev->phy.type != B43_PHYTYPE_G)
                return;
        if (dev->noisecalc.calculation_running)
                return;
        dev->noisecalc.calculation_running = 1;
        dev->noisecalc.nr_samples = 0;

        b43_generate_noise_sample(dev);
}

static void handle_irq_noise(struct b43_wldev *dev)
{
        struct b43_phy_g *phy = dev->phy.g;
        u16 tmp;
        u8 noise[4];
        u8 i, j;
        s32 average;

        /* Bottom half of Link Quality calculation. */

        if (dev->phy.type != B43_PHYTYPE_G)
                return;

        /* Possible race condition: It might be possible that the user
         * changed to a different channel in the meantime since we
         * started the calculation. We ignore that fact, since it's
         * not really that much of a problem. The background noise is
         * an estimation only anyway. Slightly wrong results will get damped
         * by the averaging of the 8 sample rounds. Additionally the
         * value is shortlived. So it will be replaced by the next noise
         * calculation round soon. */

        B43_WARN_ON(!dev->noisecalc.calculation_running);
        *((__le32 *)noise) = cpu_to_le32(b43_jssi_read(dev));
        if (noise[0] == 0x7F || noise[1] == 0x7F ||
            noise[2] == 0x7F || noise[3] == 0x7F)
                goto generate_new;

        /* Get the noise samples. */
        B43_WARN_ON(dev->noisecalc.nr_samples >= 8);
        i = dev->noisecalc.nr_samples;
        noise[0] = clamp_val(noise[0], 0, ARRAY_SIZE(phy->nrssi_lt) - 1);
        noise[1] = clamp_val(noise[1], 0, ARRAY_SIZE(phy->nrssi_lt) - 1);
        noise[2] = clamp_val(noise[2], 0, ARRAY_SIZE(phy->nrssi_lt) - 1);
        noise[3] = clamp_val(noise[3], 0, ARRAY_SIZE(phy->nrssi_lt) - 1);
        dev->noisecalc.samples[i][0] = phy->nrssi_lt[noise[0]];
        dev->noisecalc.samples[i][1] = phy->nrssi_lt[noise[1]];
        dev->noisecalc.samples[i][2] = phy->nrssi_lt[noise[2]];
        dev->noisecalc.samples[i][3] = phy->nrssi_lt[noise[3]];
        dev->noisecalc.nr_samples++;
        if (dev->noisecalc.nr_samples == 8) {
                /* Calculate the Link Quality by the noise samples. */
                average = 0;
                for (i = 0; i < 8; i++) {
                        for (j = 0; j < 4; j++)
                                average += dev->noisecalc.samples[i][j];
                }
                average /= (8 * 4);
                average *= 125;
                average += 64;
                average /= 128;
                tmp = b43_shm_read16(dev, B43_SHM_SHARED, 0x40C);
                tmp = (tmp / 128) & 0x1F;
                if (tmp >= 8)
                        average += 2;
                else
                        average -= 25;
                if (tmp == 8)
                        average -= 72;
                else
                        average -= 48;

                dev->stats.link_noise = average;
                dev->noisecalc.calculation_running = 0;
                return;
        }
generate_new:
        b43_generate_noise_sample(dev);
}

static void handle_irq_tbtt_indication(struct b43_wldev *dev)
{
        if (b43_is_mode(dev->wl, NL80211_IFTYPE_AP)) {
                ///TODO: PS TBTT
        } else {
                if (1 /*FIXME: the last PSpoll frame was sent successfully */ )
                        b43_power_saving_ctl_bits(dev, 0);
        }
        if (b43_is_mode(dev->wl, NL80211_IFTYPE_ADHOC))
                dev->dfq_valid = 1;
}

static void handle_irq_atim_end(struct b43_wldev *dev)
{
        if (dev->dfq_valid) {
                b43_write32(dev, B43_MMIO_MACCMD,
                            b43_read32(dev, B43_MMIO_MACCMD)
                            | B43_MACCMD_DFQ_VALID);
                dev->dfq_valid = 0;
        }
}

static void handle_irq_pmq(struct b43_wldev *dev)
{
        u32 tmp;

        //TODO: AP mode.

        while (1) {
                tmp = b43_read32(dev, B43_MMIO_PS_STATUS);
                if (!(tmp & 0x00000008))
                        break;
        }
        /* 16bit write is odd, but correct. */
        b43_write16(dev, B43_MMIO_PS_STATUS, 0x0002);
}

static void b43_write_template_common(struct b43_wldev *dev,
                                      const u8 * data, u16 size,
                                      u16 ram_offset,
                                      u16 shm_size_offset, u8 rate)
{
        u32 i, tmp;
        struct b43_plcp_hdr4 plcp;

        plcp.data = 0;
        b43_generate_plcp_hdr(&plcp, size + FCS_LEN, rate);
        b43_ram_write(dev, ram_offset, le32_to_cpu(plcp.data));
        ram_offset += sizeof(u32);
        /* The PLCP is 6 bytes long, but we only wrote 4 bytes, yet.
         * So leave the first two bytes of the next write blank.
         */
        tmp = (u32) (data[0]) << 16;
        tmp |= (u32) (data[1]) << 24;
        b43_ram_write(dev, ram_offset, tmp);
        ram_offset += sizeof(u32);
        for (i = 2; i < size; i += sizeof(u32)) {
                tmp = (u32) (data[i + 0]);
                if (i + 1 < size)
                        tmp |= (u32) (data[i + 1]) << 8;
                if (i + 2 < size)
                        tmp |= (u32) (data[i + 2]) << 16;
                if (i + 3 < size)
                        tmp |= (u32) (data[i + 3]) << 24;
                b43_ram_write(dev, ram_offset + i - 2, tmp);
        }
        b43_shm_write16(dev, B43_SHM_SHARED, shm_size_offset,
                        size + sizeof(struct b43_plcp_hdr6));
}

/* Check if the use of the antenna that ieee80211 told us to
 * use is possible. This will fall back to DEFAULT.
 * "antenna_nr" is the antenna identifier we got from ieee80211. */
u8 b43_ieee80211_antenna_sanitize(struct b43_wldev *dev,
                                  u8 antenna_nr)
{
        u8 antenna_mask;

        if (antenna_nr == 0) {
                /* Zero means "use default antenna". That's always OK. */
                return 0;
        }

        /* Get the mask of available antennas. */
        if (dev->phy.gmode)
                antenna_mask = dev->dev->bus->sprom.ant_available_bg;
        else
                antenna_mask = dev->dev->bus->sprom.ant_available_a;

        if (!(antenna_mask & (1 << (antenna_nr - 1)))) {
                /* This antenna is not available. Fall back to default. */
                return 0;
        }

        return antenna_nr;
}

static int b43_antenna_from_ieee80211(struct b43_wldev *dev, u8 antenna)
{
        antenna = b43_ieee80211_antenna_sanitize(dev, antenna);
        switch (antenna) {
        case 0:         /* default/diversity */
                return B43_ANTENNA_DEFAULT;
        case 1:         /* Antenna 0 */
                return B43_ANTENNA0;
        case 2:         /* Antenna 1 */
                return B43_ANTENNA1;
        case 3:         /* Antenna 2 */
                return B43_ANTENNA2;
        case 4:         /* Antenna 3 */
                return B43_ANTENNA3;
        default:
                return B43_ANTENNA_DEFAULT;
        }
}

/* Convert a b43 antenna number value to the PHY TX control value. */
static u16 b43_antenna_to_phyctl(int antenna)
{
        switch (antenna) {
        case B43_ANTENNA0:
                return B43_TXH_PHY_ANT0;
        case B43_ANTENNA1:
                return B43_TXH_PHY_ANT1;
        case B43_ANTENNA2:
                return B43_TXH_PHY_ANT2;
        case B43_ANTENNA3:
                return B43_TXH_PHY_ANT3;
        case B43_ANTENNA_AUTO:
                return B43_TXH_PHY_ANT01AUTO;
        }
        B43_WARN_ON(1);
        return 0;
}

static void b43_write_beacon_template(struct b43_wldev *dev,
                                      u16 ram_offset,
                                      u16 shm_size_offset)
{
        unsigned int i, len, variable_len;
        const struct ieee80211_mgmt *bcn;
        const u8 *ie;
        bool tim_found = 0;
        unsigned int rate;
        u16 ctl;
        int antenna;
        struct ieee80211_tx_info *info = IEEE80211_SKB_CB(dev->wl->current_beacon);

        bcn = (const struct ieee80211_mgmt *)(dev->wl->current_beacon->data);
        len = min((size_t) dev->wl->current_beacon->len,
                  0x200 - sizeof(struct b43_plcp_hdr6));
        rate = ieee80211_get_tx_rate(dev->wl->hw, info)->hw_value;

        b43_write_template_common(dev, (const u8 *)bcn,
                                  len, ram_offset, shm_size_offset, rate);

        /* Write the PHY TX control parameters. */
        antenna = b43_antenna_from_ieee80211(dev, info->antenna_sel_tx);
        antenna = b43_antenna_to_phyctl(antenna);
        ctl = b43_shm_read16(dev, B43_SHM_SHARED, B43_SHM_SH_BEACPHYCTL);
        /* We can't send beacons with short preamble. Would get PHY errors. */
        ctl &= ~B43_TXH_PHY_SHORTPRMBL;
        ctl &= ~B43_TXH_PHY_ANT;
        ctl &= ~B43_TXH_PHY_ENC;
        ctl |= antenna;
        if (b43_is_cck_rate(rate))
                ctl |= B43_TXH_PHY_ENC_CCK;
        else
                ctl |= B43_TXH_PHY_ENC_OFDM;
        b43_shm_write16(dev, B43_SHM_SHARED, B43_SHM_SH_BEACPHYCTL, ctl);

        /* Find the position of the TIM and the DTIM_period value
         * and write them to SHM. */
        ie = bcn->u.beacon.variable;
        variable_len = len - offsetof(struct ieee80211_mgmt, u.beacon.variable);
        for (i = 0; i < variable_len - 2; ) {
                uint8_t ie_id, ie_len;

                ie_id = ie[i];
                ie_len = ie[i + 1];
                if (ie_id == 5) {
                        u16 tim_position;
                        u16 dtim_period;
                        /* This is the TIM Information Element */

                        /* Check whether the ie_len is in the beacon data range. */
                        if (variable_len < ie_len + 2 + i)
                                break;
                        /* A valid TIM is at least 4 bytes long. */
                        if (ie_len < 4)
                                break;
                        tim_found = 1;

                        tim_position = sizeof(struct b43_plcp_hdr6);
                        tim_position += offsetof(struct ieee80211_mgmt, u.beacon.variable);
                        tim_position += i;

                        dtim_period = ie[i + 3];

                        b43_shm_write16(dev, B43_SHM_SHARED,
                                        B43_SHM_SH_TIMBPOS, tim_position);
                        b43_shm_write16(dev, B43_SHM_SHARED,
                                        B43_SHM_SH_DTIMPER, dtim_period);
                        break;
                }
                i += ie_len + 2;
        }
        if (!tim_found) {
                /*
                 * If ucode wants to modify TIM do it behind the beacon, this
                 * will happen, for example, when doing mesh networking.
                 */
                b43_shm_write16(dev, B43_SHM_SHARED,
                                B43_SHM_SH_TIMBPOS,
                                len + sizeof(struct b43_plcp_hdr6));
                b43_shm_write16(dev, B43_SHM_SHARED,
                                B43_SHM_SH_DTIMPER, 0);
        }
        b43dbg(dev->wl, "Updated beacon template at 0x%x\n", ram_offset);
}

static void b43_write_probe_resp_plcp(struct b43_wldev *dev,
                                      u16 shm_offset, u16 size,
                                      struct ieee80211_rate *rate)
{
        struct b43_plcp_hdr4 plcp;
        u32 tmp;
        __le16 dur;

        plcp.data = 0;
        b43_generate_plcp_hdr(&plcp, size + FCS_LEN, rate->hw_value);
        dur = ieee80211_generic_frame_duration(dev->wl->hw,
                                               dev->wl->vif, size,
                                               rate);
        /* Write PLCP in two parts and timing for packet transfer */
        tmp = le32_to_cpu(plcp.data);
        b43_shm_write16(dev, B43_SHM_SHARED, shm_offset, tmp & 0xFFFF);
        b43_shm_write16(dev, B43_SHM_SHARED, shm_offset + 2, tmp >> 16);
        b43_shm_write16(dev, B43_SHM_SHARED, shm_offset + 6, le16_to_cpu(dur));
}

/* Instead of using custom probe response template, this function
 * just patches custom beacon template by:
 * 1) Changing packet type
 * 2) Patching duration field
 * 3) Stripping TIM
 */
static const u8 * b43_generate_probe_resp(struct b43_wldev *dev,
                                          u16 *dest_size,
                                          struct ieee80211_rate *rate)
{
        const u8 *src_data;
        u8 *dest_data;
        u16 src_size, elem_size, src_pos, dest_pos;
        __le16 dur;
        struct ieee80211_hdr *hdr;
        size_t ie_start;

        src_size = dev->wl->current_beacon->len;
        src_data = (const u8 *)dev->wl->current_beacon->data;

        /* Get the start offset of the variable IEs in the packet. */
        ie_start = offsetof(struct ieee80211_mgmt, u.probe_resp.variable);
        B43_WARN_ON(ie_start != offsetof(struct ieee80211_mgmt, u.beacon.variable));

        if (B43_WARN_ON(src_size < ie_start))
                return NULL;

        dest_data = kmalloc(src_size, GFP_ATOMIC);
        if (unlikely(!dest_data))
                return NULL;

        /* Copy the static data and all Information Elements, except the TIM. */
        memcpy(dest_data, src_data, ie_start);
        src_pos = ie_start;
        dest_pos = ie_start;
        for ( ; src_pos < src_size - 2; src_pos += elem_size) {
                elem_size = src_data[src_pos + 1] + 2;
                if (src_data[src_pos] == 5) {
                        /* This is the TIM. */
                        continue;
                }
                memcpy(dest_data + dest_pos, src_data + src_pos,
                       elem_size);
                dest_pos += elem_size;
        }
        *dest_size = dest_pos;
        hdr = (struct ieee80211_hdr *)dest_data;

        /* Set the frame control. */
        hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
                                         IEEE80211_STYPE_PROBE_RESP);
        dur = ieee80211_generic_frame_duration(dev->wl->hw,
                                               dev->wl->vif, *dest_size,
                                               rate);
        hdr->duration_id = dur;

        return dest_data;
}

static void b43_write_probe_resp_template(struct b43_wldev *dev,
                                          u16 ram_offset,
                                          u16 shm_size_offset,
                                          struct ieee80211_rate *rate)
{
        const u8 *probe_resp_data;
        u16 size;

        size = dev->wl->current_beacon->len;
        probe_resp_data = b43_generate_probe_resp(dev, &size, rate);
        if (unlikely(!probe_resp_data))
                return;

        /* Looks like PLCP headers plus packet timings are stored for
         * all possible basic rates
         */
        b43_write_probe_resp_plcp(dev, 0x31A, size, &b43_b_ratetable[0]);
        b43_write_probe_resp_plcp(dev, 0x32C, size, &b43_b_ratetable[1]);
        b43_write_probe_resp_plcp(dev, 0x33E, size, &b43_b_ratetable[2]);
        b43_write_probe_resp_plcp(dev, 0x350, size, &b43_b_ratetable[3]);

        size = min((size_t) size, 0x200 - sizeof(struct b43_plcp_hdr6));
        b43_write_template_common(dev, probe_resp_data,
                                  size, ram_offset, shm_size_offset,
                                  rate->hw_value);
        kfree(probe_resp_data);
}

static void b43_upload_beacon0(struct b43_wldev *dev)
{
        struct b43_wl *wl = dev->wl;

        if (wl->beacon0_uploaded)
                return;
        b43_write_beacon_template(dev, 0x68, 0x18);
        /* FIXME: Probe resp upload doesn't really belong here,
         *        but we don't use that feature anyway. */
        b43_write_probe_resp_template(dev, 0x268, 0x4A,
                                      &__b43_ratetable[3]);
        wl->beacon0_uploaded = 1;
}

static void b43_upload_beacon1(struct b43_wldev *dev)
{
        struct b43_wl *wl = dev->wl;

        if (wl->beacon1_uploaded)
                return;
        b43_write_beacon_template(dev, 0x468, 0x1A);
        wl->beacon1_uploaded = 1;
}

static void handle_irq_beacon(struct b43_wldev *dev)
{
        struct b43_wl *wl = dev->wl;
        u32 cmd, beacon0_valid, beacon1_valid;

        if (!b43_is_mode(wl, NL80211_IFTYPE_AP) &&
            !b43_is_mode(wl, NL80211_IFTYPE_MESH_POINT))
                return;

        /* This is the bottom half of the asynchronous beacon update. */

        /* Ignore interrupt in the future. */
        dev->irq_savedstate &= ~B43_IRQ_BEACON;

        cmd = b43_read32(dev, B43_MMIO_MACCMD);
        beacon0_valid = (cmd & B43_MACCMD_BEACON0_VALID);
        beacon1_valid = (cmd & B43_MACCMD_BEACON1_VALID);

        /* Schedule interrupt manually, if busy. */
        if (beacon0_valid && beacon1_valid) {
                b43_write32(dev, B43_MMIO_GEN_IRQ_REASON, B43_IRQ_BEACON);
                dev->irq_savedstate |= B43_IRQ_BEACON;
                return;
        }

        if (unlikely(wl->beacon_templates_virgin)) {
                /* We never uploaded a beacon before.
                 * Upload both templates now, but only mark one valid. */
                wl->beacon_templates_virgin = 0;
                b43_upload_beacon0(dev);
                b43_upload_beacon1(dev);
                cmd = b43_read32(dev, B43_MMIO_MACCMD);
                cmd |= B43_MACCMD_BEACON0_VALID;
                b43_write32(dev, B43_MMIO_MACCMD, cmd);
        } else {
                if (!beacon0_valid) {
                        b43_upload_beacon0(dev);
                        cmd = b43_read32(dev, B43_MMIO_MACCMD);
                        cmd |= B43_MACCMD_BEACON0_VALID;
                        b43_write32(dev, B43_MMIO_MACCMD, cmd);
                } else if (!beacon1_valid) {
                        b43_upload_beacon1(dev);
                        cmd = b43_read32(dev, B43_MMIO_MACCMD);
                        cmd |= B43_MACCMD_BEACON1_VALID;
                        b43_write32(dev, B43_MMIO_MACCMD, cmd);
                }
        }
}

static void b43_beacon_update_trigger_work(struct work_struct *work)
{
        struct b43_wl *wl = container_of(work, struct b43_wl,
                                         beacon_update_trigger);
        struct b43_wldev *dev;

        mutex_lock(&wl->mutex);
        dev = wl->current_dev;
        if (likely(dev && (b43_status(dev) >= B43_STAT_INITIALIZED))) {
                spin_lock_irq(&wl->irq_lock);
                /* update beacon right away or defer to irq */
                dev->irq_savedstate = b43_read32(dev, B43_MMIO_GEN_IRQ_MASK);
                handle_irq_beacon(dev);
                /* The handler might have updated the IRQ mask. */
                b43_write32(dev, B43_MMIO_GEN_IRQ_MASK,
                            dev->irq_savedstate);
                mmiowb();
                spin_unlock_irq(&wl->irq_lock);
        }
        mutex_unlock(&wl->mutex);
}

/* Asynchronously update the packet templates in template RAM.
 * Locking: Requires wl->irq_lock to be locked. */
static void b43_update_templates(struct b43_wl *wl)
{
        struct sk_buff *beacon;

        /* This is the top half of the ansynchronous beacon update.
         * The bottom half is the beacon IRQ.
         * Beacon update must be asynchronous to avoid sending an
         * invalid beacon. This can happen for example, if the firmware
         * transmits a beacon while we are updating it. */

        /* We could modify the existing beacon and set the aid bit in
         * the TIM field, but that would probably require resizing and
         * moving of data within the beacon template.
         * Simply request a new beacon and let mac80211 do the hard work. */
        beacon = ieee80211_beacon_get(wl->hw, wl->vif);
        if (unlikely(!beacon))
                return;

        if (wl->current_beacon)
                dev_kfree_skb_any(wl->current_beacon);
        wl->current_beacon = beacon;
        wl->beacon0_uploaded = 0;
        wl->beacon1_uploaded = 0;
        queue_work(wl->hw->workqueue, &wl->beacon_update_trigger);
}

static void b43_set_ssid(struct b43_wldev *dev, const u8 * ssid, u8 ssid_len)
{
        u32 tmp;
        u16 i, len;

        len = min((u16) ssid_len, (u16) 0x100);
        for (i = 0; i < len; i += sizeof(u32)) {
                tmp = (u32) (ssid[i + 0]);
                if (i + 1 < len)
                        tmp |= (u32) (ssid[i + 1]) << 8;
                if (i + 2 < len)
                        tmp |= (u32) (ssid[i + 2]) << 16;
                if (i + 3 < len)
                        tmp |= (u32) (ssid[i + 3]) << 24;
                b43_shm_write32(dev, B43_SHM_SHARED, 0x380 + i, tmp);
        }
        b43_shm_write16(dev, B43_SHM_SHARED, 0x48, len);
}

static void b43_set_beacon_int(struct b43_wldev *dev, u16 beacon_int)
{
        b43_time_lock(dev);
        if (dev->dev->id.revision >= 3) {
                b43_write32(dev, B43_MMIO_TSF_CFP_REP, (beacon_int << 16));
                b43_write32(dev, B43_MMIO_TSF_CFP_START, (beacon_int << 10));
        } else {
                b43_write16(dev, 0x606, (beacon_int >> 6));
                b43_write16(dev, 0x610, beacon_int);
        }
        b43_time_unlock(dev);
        b43dbg(dev->wl, "Set beacon interval to %u\n", beacon_int);
}

static void b43_handle_firmware_panic(struct b43_wldev *dev)
{
        u16 reason;

        /* Read the register that contains the reason code for the panic. */
        reason = b43_shm_read16(dev, B43_SHM_SCRATCH, B43_FWPANIC_REASON_REG);
        b43err(dev->wl, "Whoopsy, firmware panic! Reason: %u\n", reason);

        switch (reason) {
        default:
                b43dbg(dev->wl, "The panic reason is unknown.\n");
                /* fallthrough */
        case B43_FWPANIC_DIE:
                /* Do not restart the controller or firmware.
                 * The device is nonfunctional from now on.
                 * Restarting would result in this panic to trigger again,
                 * so we avoid that recursion. */
                break;
        case B43_FWPANIC_RESTART:
                b43_controller_restart(dev, "Microcode panic");
                break;
        }
}

static void handle_irq_ucode_debug(struct b43_wldev *dev)
{
        unsigned int i, cnt;
        u16 reason, marker_id, marker_line;
        __le16 *buf;

        /* The proprietary firmware doesn't have this IRQ. */
        if (!dev->fw.opensource)
                return;

        /* Read the register that contains the reason code for this IRQ. */
        reason = b43_shm_read16(dev, B43_SHM_SCRATCH, B43_DEBUGIRQ_REASON_REG);

        switch (reason) {
        case B43_DEBUGIRQ_PANIC:
                b43_handle_firmware_panic(dev);
                break;
        case B43_DEBUGIRQ_DUMP_SHM:
                if (!B43_DEBUG)
                        break; /* Only with driver debugging enabled. */
                buf = kmalloc(4096, GFP_ATOMIC);
                if (!buf) {
                        b43dbg(dev->wl, "SHM-dump: Failed to allocate memory\n");
                        goto out;
                }
                for (i = 0; i < 4096; i += 2) {
                        u16 tmp = b43_shm_read16(dev, B43_SHM_SHARED, i);
                        buf[i / 2] = cpu_to_le16(tmp);
                }
                b43info(dev->wl, "Shared memory dump:\n");
                print_hex_dump(KERN_INFO, "", DUMP_PREFIX_OFFSET,
                               16, 2, buf, 4096, 1);
                kfree(buf);
                break;
        case B43_DEBUGIRQ_DUMP_REGS:
                if (!B43_DEBUG)
                        break; /* Only with driver debugging enabled. */
                b43info(dev->wl, "Microcode register dump:\n");
                for (i = 0, cnt = 0; i < 64; i++) {
                        u16 tmp = b43_shm_read16(dev, B43_SHM_SCRATCH, i);
                        if (cnt == 0)
                                printk(KERN_INFO);
                        printk("r%02u: 0x%04X  ", i, tmp);
                        cnt++;
                        if (cnt == 6) {
                                printk("\n");
                                cnt = 0;
                        }
                }
                printk("\n");
                break;
        case B43_DEBUGIRQ_MARKER:
                if (!B43_DEBUG)
                        break; /* Only with driver debugging enabled. */
                marker_id = b43_shm_read16(dev, B43_SHM_SCRATCH,
                                           B43_MARKER_ID_REG);
                marker_line = b43_shm_read16(dev, B43_SHM_SCRATCH,
                                             B43_MARKER_LINE_REG);
                b43info(dev->wl, "The firmware just executed the MARKER(%u) "
                        "at line number %u\n",
                        marker_id, marker_line);
                break;
        default:
                b43dbg(dev->wl, "Debug-IRQ triggered for unknown reason: %u\n",
                       reason);
        }
out:
        /* Acknowledge the debug-IRQ, so the firmware can continue. */
        b43_shm_write16(dev, B43_SHM_SCRATCH,
                        B43_DEBUGIRQ_REASON_REG, B43_DEBUGIRQ_ACK);
}

/* Interrupt handler bottom-half */
static void b43_interrupt_tasklet(struct b43_wldev *dev)
{
        u32 reason;
        u32 dma_reason[ARRAY_SIZE(dev->dma_reason)];
        u32 merged_dma_reason = 0;
        int i;
        unsigned long flags;

        spin_lock_irqsave(&dev->wl->irq_lock, flags);

        B43_WARN_ON(b43_status(dev) != B43_STAT_STARTED);

        reason = dev->irq_reason;
        for (i = 0; i < ARRAY_SIZE(dma_reason); i++) {
                dma_reason[i] = dev->dma_reason[i];
                merged_dma_reason |= dma_reason[i];
        }

        if (unlikely(reason & B43_IRQ_MAC_TXERR))
                b43err(dev->wl, "MAC transmission error\n");

        if (unlikely(reason & B43_IRQ_PHY_TXERR)) {
                b43err(dev->wl, "PHY transmission error\n");
                rmb();
                if (unlikely(atomic_dec_and_test(&dev->phy.txerr_cnt))) {
                        atomic_set(&dev->phy.txerr_cnt,
                                   B43_PHY_TX_BADNESS_LIMIT);
                        b43err(dev->wl, "Too many PHY TX errors, "
                                        "restarting the controller\n");
                        b43_controller_restart(dev, "PHY TX errors");
                }
        }

        if (unlikely(merged_dma_reason & (B43_DMAIRQ_FATALMASK |
                                          B43_DMAIRQ_NONFATALMASK))) {
                if (merged_dma_reason & B43_DMAIRQ_FATALMASK) {
                        b43err(dev->wl, "Fatal DMA error: "
                               "0x%08X, 0x%08X, 0x%08X, "
                               "0x%08X, 0x%08X, 0x%08X\n",
                               dma_reason[0], dma_reason[1],
                               dma_reason[2], dma_reason[3],
                               dma_reason[4], dma_reason[5]);
                        b43_controller_restart(dev, "DMA error");
                        mmiowb();
                        spin_unlock_irqrestore(&dev->wl->irq_lock, flags);
                        return;
                }
                if (merged_dma_reason & B43_DMAIRQ_NONFATALMASK) {
                        b43err(dev->wl, "DMA error: "
                               "0x%08X, 0x%08X, 0x%08X, "
                               "0x%08X, 0x%08X, 0x%08X\n",
                               dma_reason[0], dma_reason[1],
                               dma_reason[2], dma_reason[3],
                               dma_reason[4], dma_reason[5]);
                }
        }

        if (unlikely(reason & B43_IRQ_UCODE_DEBUG))
                handle_irq_ucode_debug(dev);
        if (reason & B43_IRQ_TBTT_INDI)
                handle_irq_tbtt_indication(dev);
        if (reason & B43_IRQ_ATIM_END)
                handle_irq_atim_end(dev);
        if (reason & B43_IRQ_BEACON)
                handle_irq_beacon(dev);
        if (reason & B43_IRQ_PMQ)
                handle_irq_pmq(dev);
        if (reason & B43_IRQ_TXFIFO_FLUSH_OK)
                ;/* TODO */
        if (reason & B43_IRQ_NOISESAMPLE_OK)
                handle_irq_noise(dev);

        /* Check the DMA reason registers for received data. */
        if (dma_reason[0] & B43_DMAIRQ_RX_DONE) {
                if (b43_using_pio_transfers(dev))
                        b43_pio_rx(dev->pio.rx_queue);
                else
                        b43_dma_rx(dev->dma.rx_ring);
        }
        B43_WARN_ON(dma_reason[1] & B43_DMAIRQ_RX_DONE);
        B43_WARN_ON(dma_reason[2] & B43_DMAIRQ_RX_DONE);
        B43_WARN_ON(dma_reason[3] & B43_DMAIRQ_RX_DONE);
        B43_WARN_ON(dma_reason[4] & B43_DMAIRQ_RX_DONE);
        B43_WARN_ON(dma_reason[5] & B43_DMAIRQ_RX_DONE);

        if (reason & B43_IRQ_TX_OK)
                handle_irq_transmit_status(dev);

        b43_interrupt_enable(dev, dev->irq_savedstate);
        mmiowb();
        spin_unlock_irqrestore(&dev->wl->irq_lock, flags);
}

static void b43_interrupt_ack(struct b43_wldev *dev, u32 reason)
{
        b43_write32(dev, B43_MMIO_GEN_IRQ_REASON, reason);

        b43_write32(dev, B43_MMIO_DMA0_REASON, dev->dma_reason[0]);
        b43_write32(dev, B43_MMIO_DMA1_REASON, dev->dma_reason[1]);
        b43_write32(dev, B43_MMIO_DMA2_REASON, dev->dma_reason[2]);
        b43_write32(dev, B43_MMIO_DMA3_REASON, dev->dma_reason[3]);
        b43_write32(dev, B43_MMIO_DMA4_REASON, dev->dma_reason[4]);
        b43_write32(dev, B43_MMIO_DMA5_REASON, dev->dma_reason[5]);
}

/* Interrupt handler top-half */
static irqreturn_t b43_interrupt_handler(int irq, void *dev_id)
{
        irqreturn_t ret = IRQ_NONE;
        struct b43_wldev *dev = dev_id;
        u32 reason;

        if (!dev)
                return IRQ_NONE;

        spin_lock(&dev->wl->irq_lock);

        if (b43_status(dev) < B43_STAT_STARTED)
                goto out;
        reason = b43_read32(dev, B43_MMIO_GEN_IRQ_REASON);
        if (reason == 0xffffffff)       /* shared IRQ */
                goto out;
        ret = IRQ_HANDLED;
        reason &= b43_read32(dev, B43_MMIO_GEN_IRQ_MASK);
        if (!reason)
                goto out;

        dev->dma_reason[0] = b43_read32(dev, B43_MMIO_DMA0_REASON)
            & 0x0001DC00;
        dev->dma_reason[1] = b43_read32(dev, B43_MMIO_DMA1_REASON)
            & 0x0000DC00;
        dev->dma_reason[2] = b43_read32(dev, B43_MMIO_DMA2_REASON)
            & 0x0000DC00;
        dev->dma_reason[3] = b43_read32(dev, B43_MMIO_DMA3_REASON)
            & 0x0001DC00;
        dev->dma_reason[4] = b43_read32(dev, B43_MMIO_DMA4_REASON)
            & 0x0000DC00;
        dev->dma_reason[5] = b43_read32(dev, B43_MMIO_DMA5_REASON)
            & 0x0000DC00;

        b43_interrupt_ack(dev, reason);
        /* disable all IRQs. They are enabled again in the bottom half. */
        dev->irq_savedstate = b43_interrupt_disable(dev, B43_IRQ_ALL);
        /* save the reason code and call our bottom half. */
        dev->irq_reason = reason;
        tasklet_schedule(&dev->isr_tasklet);
      out:
        mmiowb();
        spin_unlock(&dev->wl->irq_lock);

        return ret;
}

static void do_release_fw(struct b43_firmware_file *fw)
{
        release_firmware(fw->data);
        fw->data = NULL;
        fw->filename = NULL;
}

static void b43_release_firmware(struct b43_wldev *dev)
{
        do_release_fw(&dev->fw.ucode);
        do_release_fw(&dev->fw.pcm);
        do_release_fw(&dev->fw.initvals);
        do_release_fw(&dev->fw.initvals_band);
}

static void b43_print_fw_helptext(struct b43_wl *wl, bool error)
{
        const char *text;

        text = "You must go to "
               "http://linuxwireless.org/en/users/Drivers/b43#devicefirmware "
               "and download the latest firmware (version 4).\n";

        if (error)
                b43err(wl, text);
        else
                b43warn(wl, text);
}

static int do_request_fw(struct b43_wldev *dev,
                         const char *name,
                         struct b43_firmware_file *fw,
                         bool silent)
{
        char path[sizeof(modparam_fwpostfix) + 32];
        const struct firmware *blob;
        struct b43_fw_header *hdr;
        u32 size;
        int err;

        if (!name) {
                /* Don't fetch anything. Free possibly cached firmware. */
                do_release_fw(fw);
                return 0;
        }
        if (fw->filename) {
                if (strcmp(fw->filename, name) == 0)
                        return 0; /* Already have this fw. */
                /* Free the cached firmware first. */
                do_release_fw(fw);
        }

        snprintf(path, ARRAY_SIZE(path),
                 "b43%s/%s.fw",
                 modparam_fwpostfix, name);
        err = request_firmware(&blob, path, dev->dev->dev);
        if (err == -ENOENT) {
                if (!silent) {
                        b43err(dev->wl, "Firmware file \"%s\" not found\n",
                               path);
                }
                return err;
        } else if (err) {
                b43err(dev->wl, "Firmware file \"%s\" request failed (err=%d)\n",
                       path, err);
                return err;
        }
        if (blob->size < sizeof(struct b43_fw_header))
                goto err_format;
        hdr = (struct b43_fw_header *)(blob->data);
        switch (hdr->type) {
        case B43_FW_TYPE_UCODE:
        case B43_FW_TYPE_PCM:
                size = be32_to_cpu(hdr->size);
                if (size != blob->size - sizeof(struct b43_fw_header))
                        goto err_format;
                /* fallthrough */
        case B43_FW_TYPE_IV:
                if (hdr->ver != 1)
                        goto err_format;
                break;
        default:
                goto err_format;
        }

        fw->data = blob;
        fw->filename = name;

        return 0;

err_format:
        b43err(dev->wl, "Firmware file \"%s\" format error.\n", path);
        release_firmware(blob);

        return -EPROTO;
}

static int b43_request_firmware(struct b43_wldev *dev)
{
        struct b43_firmware *fw = &dev->fw;
        const u8 rev = dev->dev->id.revision;
        const char *filename;
        u32 tmshigh;
        int err;

        /* Get microcode */
        tmshigh = ssb_read32(dev->dev, SSB_TMSHIGH);
        if ((rev >= 5) && (rev <= 10))
                filename = "ucode5";
        else if ((rev >= 11) && (rev <= 12))
                filename = "ucode11";
        else if (rev >= 13)
                filename = "ucode13";
        else
                goto err_no_ucode;
        err = do_request_fw(dev, filename, &fw->ucode, 0);
        if (err)
                goto err_load;

        /* Get PCM code */
        if ((rev >= 5) && (rev <= 10))
                filename = "pcm5";
        else if (rev >= 11)
                filename = NULL;
        else
                goto err_no_pcm;
        fw->pcm_request_failed = 0;
        err = do_request_fw(dev, filename, &fw->pcm, 1);
        if (err == -ENOENT) {
                /* We did not find a PCM file? Not fatal, but
                 * core rev <= 10 must do without hwcrypto then. */
                fw->pcm_request_failed = 1;
        } else if (err)
                goto err_load;

        /* Get initvals */
        switch (dev->phy.type) {
        case B43_PHYTYPE_A:
                if ((rev >= 5) && (rev <= 10)) {
                        if (tmshigh & B43_TMSHIGH_HAVE_2GHZ_PHY)
                                filename = "a0g1initvals5";
                        else
                                filename = "a0g0initvals5";
                } else
                        goto err_no_initvals;
                break;
        case B43_PHYTYPE_G:
                if ((rev >= 5) && (rev <= 10))
                        filename = "b0g0initvals5";
                else if (rev >= 13)
                        filename = "b0g0initvals13";
                else
                        goto err_no_initvals;
                break;
        case B43_PHYTYPE_N:
                if ((rev >= 11) && (rev <= 12))
                        filename = "n0initvals11";
                else
                        goto err_no_initvals;
                break;
        default:
                goto err_no_initvals;
        }
        err = do_request_fw(dev, filename, &fw->initvals, 0);
        if (err)
                goto err_load;

        /* Get bandswitch initvals */
        switch (dev->phy.type) {
        case B43_PHYTYPE_A:
                if ((rev >= 5) && (rev <= 10)) {
                        if (tmshigh & B43_TMSHIGH_HAVE_2GHZ_PHY)
                                filename = "a0g1bsinitvals5";
                        else
                                filename = "a0g0bsinitvals5";
                } else if (rev >= 11)
                        filename = NULL;
                else
                        goto err_no_initvals;
                break;
        case B43_PHYTYPE_G:
                if ((rev >= 5) && (rev <= 10))
                        filename = "b0g0bsinitvals5";
                else if (rev >= 11)
                        filename = NULL;
                else
                        goto err_no_initvals;
                break;
        case B43_PHYTYPE_N:
                if ((rev >= 11) && (rev <= 12))
                        filename = "n0bsinitvals11";
                else
                        goto err_no_initvals;
                break;
        default:
                goto err_no_initvals;
        }
        err = do_request_fw(dev, filename, &fw->initvals_band, 0);
        if (err)
                goto err_load;

        return 0;

err_load:
        b43_print_fw_helptext(dev->wl, 1);
        goto error;

err_no_ucode:
        err = -ENODEV;
        b43err(dev->wl, "No microcode available for core rev %u\n", rev);
        goto error;

err_no_pcm:
        err = -ENODEV;
        b43err(dev->wl, "No PCM available for core rev %u\n", rev);
        goto error;

err_no_initvals:
        err = -ENODEV;
        b43err(dev->wl, "No Initial Values firmware file for PHY %u, "
               "core rev %u\n", dev->phy.type, rev);
        goto error;

error:
        b43_release_firmware(dev);
        return err;
}

static int b43_upload_microcode(struct b43_wldev *dev)
{
        const size_t hdr_len = sizeof(struct b43_fw_header);
        const __be32 *data;
        unsigned int i, len;
        u16 fwrev, fwpatch, fwdate, fwtime;
        u32 tmp, macctl;
        int err = 0;

        /* Jump the microcode PSM to offset 0 */
        macctl = b43_read32(dev, B43_MMIO_MACCTL);
        B43_WARN_ON(macctl & B43_MACCTL_PSM_RUN);
        macctl |= B43_MACCTL_PSM_JMP0;
        b43_write32(dev, B43_MMIO_MACCTL, macctl);
        /* Zero out all microcode PSM registers and shared memory. */
        for (i = 0; i < 64; i++)
                b43_shm_write16(dev, B43_SHM_SCRATCH, i, 0);
        for (i = 0; i < 4096; i += 2)
                b43_shm_write16(dev, B43_SHM_SHARED, i, 0);

        /* Upload Microcode. */
        data = (__be32 *) (dev->fw.ucode.data->data + hdr_len);
        len = (dev->fw.ucode.data->size - hdr_len) / sizeof(__be32);
        b43_shm_control_word(dev, B43_SHM_UCODE | B43_SHM_AUTOINC_W, 0x0000);
        for (i = 0; i < len; i++) {
                b43_write32(dev, B43_MMIO_SHM_DATA, be32_to_cpu(data[i]));
                udelay(10);
        }

        if (dev->fw.pcm.data) {
                /* Upload PCM data. */
                data = (__be32 *) (dev->fw.pcm.data->data + hdr_len);
                len = (dev->fw.pcm.data->size - hdr_len) / sizeof(__be32);
                b43_shm_control_word(dev, B43_SHM_HW, 0x01EA);
                b43_write32(dev, B43_MMIO_SHM_DATA, 0x00004000);
                /* No need for autoinc bit in SHM_HW */
                b43_shm_control_word(dev, B43_SHM_HW, 0x01EB);
                for (i = 0; i < len; i++) {
                        b43_write32(dev, B43_MMIO_SHM_DATA, be32_to_cpu(data[i]));
                        udelay(10);
                }
        }

        b43_write32(dev, B43_MMIO_GEN_IRQ_REASON, B43_IRQ_ALL);

        /* Start the microcode PSM */
        macctl = b43_read32(dev, B43_MMIO_MACCTL);
        macctl &= ~B43_MACCTL_PSM_JMP0;
        macctl |= B43_MACCTL_PSM_RUN;
        b43_write32(dev, B43_MMIO_MACCTL, macctl);

        /* Wait for the microcode to load and respond */
        i = 0;
        while (1) {
                tmp = b43_read32(dev, B43_MMIO_GEN_IRQ_REASON);
                if (tmp == B43_IRQ_MAC_SUSPENDED)
                        break;
                i++;
                if (i >= 20) {
                        b43err(dev->wl, "Microcode not responding\n");
                        b43_print_fw_helptext(dev->wl, 1);
                        err = -ENODEV;
                        goto error;
                }
                msleep_interruptible(50);
                if (signal_pending(current)) {
                        err = -EINTR;
                        goto error;
                }
        }
        b43_read32(dev, B43_MMIO_GEN_IRQ_REASON);       /* dummy read */

        /* Get and check the revisions. */
        fwrev = b43_shm_read16(dev, B43_SHM_SHARED, B43_SHM_SH_UCODEREV);
        fwpatch = b43_shm_read16(dev, B43_SHM_SHARED, B43_SHM_SH_UCODEPATCH);
        fwdate = b43_shm_read16(dev, B43_SHM_SHARED, B43_SHM_SH_UCODEDATE);
        fwtime = b43_shm_read16(dev, B43_SHM_SHARED, B43_SHM_SH_UCODETIME);

        if (fwrev <= 0x128) {
                b43err(dev->wl, "YOUR FIRMWARE IS TOO OLD. Firmware from "
                       "binary drivers older than version 4.x is unsupported. "
                       "You must upgrade your firmware files.\n");
                b43_print_fw_helptext(dev->wl, 1);
                err = -EOPNOTSUPP;
                goto error;
        }
        dev->fw.rev = fwrev;
        dev->fw.patch = fwpatch;
        dev->fw.opensource = (fwdate == 0xFFFF);

        if (dev->fw.opensource) {
                /* Patchlevel info is encoded in the "time" field. */
                dev->fw.patch = fwtime;
                b43info(dev->wl, "Loading OpenSource firmware version %u.%u%s\n",
                        dev->fw.rev, dev->fw.patch,
                        dev->fw.pcm_request_failed ? " (Hardware crypto not supported)" : "");
        } else {
                b43info(dev->wl, "Loading firmware version %u.%u "
                        "(20%.2i-%.2i-%.2i %.2i:%.2i:%.2i)\n",
                        fwrev, fwpatch,
                        (fwdate >> 12) & 0xF, (fwdate >> 8) & 0xF, fwdate & 0xFF,
                        (fwtime >> 11) & 0x1F, (fwtime >> 5) & 0x3F, fwtime & 0x1F);
                if (dev->fw.pcm_request_failed) {
                        b43warn(dev->wl, "No \"pcm5.fw\" firmware file found. "
                                "Hardware accelerated cryptography is disabled.\n");
                        b43_print_fw_helptext(dev->wl, 0);
                }
        }

        if (b43_is_old_txhdr_format(dev)) {
                b43warn(dev->wl, "You are using an old firmware image. "
                        "Support for old firmware will be removed in July 2008.\n");
                b43_print_fw_helptext(dev->wl, 0);
        }

        return 0;

error:
        macctl = b43_read32(dev, B43_MMIO_MACCTL);
        macctl &= ~B43_MACCTL_PSM_RUN;
        macctl |= B43_MACCTL_PSM_JMP0;
        b43_write32(dev, B43_MMIO_MACCTL, macctl);

        return err;
}

static int b43_write_initvals(struct b43_wldev *dev,
                              const struct b43_iv *ivals,
                              size_t count,
                              size_t array_size)
{
        const struct b43_iv *iv;
        u16 offset;
        size_t i;
        bool bit32;

        BUILD_BUG_ON(sizeof(struct b43_iv) != 6);
        iv = ivals;
        for (i = 0; i < count; i++) {
                if (array_size < sizeof(iv->offset_size))
                        goto err_format;
                array_size -= sizeof(iv->offset_size);
                offset = be16_to_cpu(iv->offset_size);
                bit32 = !!(offset & B43_IV_32BIT);
                offset &= B43_IV_OFFSET_MASK;
                if (offset >= 0x1000)
                        goto err_format;
                if (bit32) {
                        u32 value;

                        if (array_size < sizeof(iv->data.d32))
                                goto err_format;
                        array_size -= sizeof(iv->data.d32);

                        value = get_unaligned_be32(&iv->data.d32);
                        b43_write32(dev, offset, value);

                        iv = (const struct b43_iv *)((const uint8_t *)iv +
                                                        sizeof(__be16) +
                                                        sizeof(__be32));
                } else {
                        u16 value;

                        if (array_size < sizeof(iv->data.d16))
                                goto err_format;
                        array_size -= sizeof(iv->data.d16);

                        value = be16_to_cpu(iv->data.d16);
                        b43_write16(dev, offset, value);

                        iv = (const struct b43_iv *)((const uint8_t *)iv +
                                                        sizeof(__be16) +
                                                        sizeof(__be16));
                }
        }
        if (array_size)
                goto err_format;

        return 0;

err_format:
        b43err(dev->wl, "Initial Values Firmware file-format error.\n");
        b43_print_fw_helptext(dev->wl, 1);

        return -EPROTO;
}

static int b43_upload_initvals(struct b43_wldev *dev)
{
        const size_t hdr_len = sizeof(struct b43_fw_header);
        const struct b43_fw_header *hdr;
        struct b43_firmware *fw = &dev->fw;
        const struct b43_iv *ivals;
        size_t count;
        int err;

        hdr = (const struct b43_fw_header *)(fw->initvals.data->data);
        ivals = (const struct b43_iv *)(fw->initvals.data->data + hdr_len);
        count = be32_to_cpu(hdr->size);
        err = b43_write_initvals(dev, ivals, count,
                                 fw->initvals.data->size - hdr_len);
        if (err)
                goto out;
        if (fw->initvals_band.data) {
                hdr = (const struct b43_fw_header *)(fw->initvals_band.data->data);
                ivals = (const struct b43_iv *)(fw->initvals_band.data->data + hdr_len);
                count = be32_to_cpu(hdr->size);
                err = b43_write_initvals(dev, ivals, count,
                                         fw->initvals_band.data->size - hdr_len);
                if (err)
                        goto out;
        }
out:

        return err;
}

/* Initialize the GPIOs
 * http://bcm-specs.sipsolutions.net/GPIO
 */
static int b43_gpio_init(struct b43_wldev *dev)
{
        struct ssb_bus *bus = dev->dev->bus;
        struct ssb_device *gpiodev, *pcidev = NULL;
        u32 mask, set;

        b43_write32(dev, B43_MMIO_MACCTL, b43_read32(dev, B43_MMIO_MACCTL)
                    & ~B43_MACCTL_GPOUTSMSK);

        b43_write16(dev, B43_MMIO_GPIO_MASK, b43_read16(dev, B43_MMIO_GPIO_MASK)
                    | 0x000F);

        mask = 0x0000001F;
        set = 0x0000000F;
        if (dev->dev->bus->chip_id == 0x4301) {
                mask |= 0x0060;
                set |= 0x0060;
        }
        if (0 /* FIXME: conditional unknown */ ) {
                b43_write16(dev, B43_MMIO_GPIO_MASK,
                            b43_read16(dev, B43_MMIO_GPIO_MASK)
                            | 0x0100);
                mask |= 0x0180;
                set |= 0x0180;
        }
        if (dev->dev->bus->sprom.boardflags_lo & B43_BFL_PACTRL) {
                b43_write16(dev, B43_MMIO_GPIO_MASK,
                            b43_read16(dev, B43_MMIO_GPIO_MASK)
                            | 0x0200);
                mask |= 0x0200;
                set |= 0x0200;
        }
        if (dev->dev->id.revision >= 2)
                mask |= 0x0010; /* FIXME: This is redundant. */

#ifdef CONFIG_SSB_DRIVER_PCICORE
        pcidev = bus->pcicore.dev;
#endif
        gpiodev = bus->chipco.dev ? : pcidev;
        if (!gpiodev)
                return 0;
        ssb_write32(gpiodev, B43_GPIO_CONTROL,
                    (ssb_read32(gpiodev, B43_GPIO_CONTROL)
                     & mask) | set);

        return 0;
}

/* Turn off all GPIO stuff. Call this on module unload, for example. */
static void b43_gpio_cleanup(struct b43_wldev *dev)
{
        struct ssb_bus *bus = dev->dev->bus;
        struct ssb_device *gpiodev, *pcidev = NULL;

#ifdef CONFIG_SSB_DRIVER_PCICORE
        pcidev = bus->pcicore.dev;
#endif
        gpiodev = bus->chipco.dev ? : pcidev;
        if (!gpiodev)
                return;
        ssb_write32(gpiodev, B43_GPIO_CONTROL, 0);
}

/* http://bcm-specs.sipsolutions.net/EnableMac */
void b43_mac_enable(struct b43_wldev *dev)
{
        if (b43_debug(dev, B43_DBG_FIRMWARE)) {
                u16 fwstate;

                fwstate = b43_shm_read16(dev, B43_SHM_SHARED,
                                         B43_SHM_SH_UCODESTAT);
                if ((fwstate != B43_SHM_SH_UCODESTAT_SUSP) &&
                    (fwstate != B43_SHM_SH_UCODESTAT_SLEEP)) {
                        b43err(dev->wl, "b43_mac_enable(): The firmware "
                               "should be suspended, but current state is %u\n",
                               fwstate);
                }
        }

        dev->mac_suspended--;
        B43_WARN_ON(dev->mac_suspended < 0);
        if (dev->mac_suspended == 0) {
                b43_write32(dev, B43_MMIO_MACCTL,
                            b43_read32(dev, B43_MMIO_MACCTL)
                            | B43_MACCTL_ENABLED);
                b43_write32(dev, B43_MMIO_GEN_IRQ_REASON,
                            B43_IRQ_MAC_SUSPENDED);
                /* Commit writes */
                b43_read32(dev, B43_MMIO_MACCTL);
                b43_read32(dev, B43_MMIO_GEN_IRQ_REASON);
                b43_power_saving_ctl_bits(dev, 0);
        }
}

/* http://bcm-specs.sipsolutions.net/SuspendMAC */
void b43_mac_suspend(struct b43_wldev *dev)
{
        int i;
        u32 tmp;

        might_sleep();
        B43_WARN_ON(dev->mac_suspended < 0);

        if (dev->mac_suspended == 0) {
                b43_power_saving_ctl_bits(dev, B43_PS_AWAKE);
                b43_write32(dev, B43_MMIO_MACCTL,
                            b43_read32(dev, B43_MMIO_MACCTL)
                            & ~B43_MACCTL_ENABLED);
                /* force pci to flush the write */
                b43_read32(dev, B43_MMIO_MACCTL);
                for (i = 35; i; i--) {
                        tmp = b43_read32(dev, B43_MMIO_GEN_IRQ_REASON);
                        if (tmp & B43_IRQ_MAC_SUSPENDED)
                                goto out;
                        udelay(10);
                }
                /* Hm, it seems this will take some time. Use msleep(). */
                for (i = 40; i; i--) {
                        tmp = b43_read32(dev, B43_MMIO_GEN_IRQ_REASON);
                        if (tmp & B43_IRQ_MAC_SUSPENDED)
                                goto out;
                        msleep(1);
                }
                b43err(dev->wl, "MAC suspend failed\n");
        }
out:
        dev->mac_suspended++;
}

static void b43_adjust_opmode(struct b43_wldev *dev)
{
        struct b43_wl *wl = dev->wl;
        u32 ctl;
        u16 cfp_pretbtt;

        ctl = b43_read32(dev, B43_MMIO_MACCTL);
        /* Reset status to STA infrastructure mode. */
        ctl &= ~B43_MACCTL_AP;
        ctl &= ~B43_MACCTL_KEEP_CTL;
        ctl &= ~B43_MACCTL_KEEP_BADPLCP;
        ctl &= ~B43_MACCTL_KEEP_BAD;
        ctl &= ~B43_MACCTL_PROMISC;
        ctl &= ~B43_MACCTL_BEACPROMISC;
        ctl |= B43_MACCTL_INFRA;

        if (b43_is_mode(wl, NL80211_IFTYPE_AP) ||
            b43_is_mode(wl, NL80211_IFTYPE_MESH_POINT))
                ctl |= B43_MACCTL_AP;
        else if (b43_is_mode(wl, NL80211_IFTYPE_ADHOC))
                ctl &= ~B43_MACCTL_INFRA;

        if (wl->filter_flags & FIF_CONTROL)
                ctl |= B43_MACCTL_KEEP_CTL;
        if (wl->filter_flags & FIF_FCSFAIL)
                ctl |= B43_MACCTL_KEEP_BAD;
        if (wl->filter_flags & FIF_PLCPFAIL)
                ctl |= B43_MACCTL_KEEP_BADPLCP;
        if (wl->filter_flags & FIF_PROMISC_IN_BSS)
                ctl |= B43_MACCTL_PROMISC;
        if (wl->filter_flags & FIF_BCN_PRBRESP_PROMISC)
                ctl |= B43_MACCTL_BEACPROMISC;

        /* Workaround: On old hardware the HW-MAC-address-filter
         * doesn't work properly, so always run promisc in filter
         * it in software. */
        if (dev->dev->id.revision <= 4)
                ctl |= B43_MACCTL_PROMISC;

        b43_write32(dev, B43_MMIO_MACCTL, ctl);

        cfp_pretbtt = 2;
        if ((ctl & B43_MACCTL_INFRA) && !(ctl & B43_MACCTL_AP)) {
                if (dev->dev->bus->chip_id == 0x4306 &&
                    dev->dev->bus->chip_rev == 3)
                        cfp_pretbtt = 100;
                else
                        cfp_pretbtt = 50;
        }
        b43_write16(dev, 0x612, cfp_pretbtt);
}

static void b43_rate_memory_write(struct b43_wldev *dev, u16 rate, int is_ofdm)
{
        u16 offset;

        if (is_ofdm) {
                offset = 0x480;
                offset += (b43_plcp_get_ratecode_ofdm(rate) & 0x000F) * 2;
        } else {
                offset = 0x4C0;
                offset += (b43_plcp_get_ratecode_cck(rate) & 0x000F) * 2;
        }
        b43_shm_write16(dev, B43_SHM_SHARED, offset + 0x20,
                        b43_shm_read16(dev, B43_SHM_SHARED, offset));
}

static void b43_rate_memory_init(struct b43_wldev *dev)
{
        switch (dev->phy.type) {
        case B43_PHYTYPE_A:
        case B43_PHYTYPE_G:
        case B43_PHYTYPE_N:
                b43_rate_memory_write(dev, B43_OFDM_RATE_6MB, 1);
                b43_rate_memory_write(dev, B43_OFDM_RATE_12MB, 1);
                b43_rate_memory_write(dev, B43_OFDM_RATE_18MB, 1);
                b43_rate_memory_write(dev, B43_OFDM_RATE_24MB, 1);
                b43_rate_memory_write(dev, B43_OFDM_RATE_36MB, 1);
                b43_rate_memory_write(dev, B43_OFDM_RATE_48MB, 1);
                b43_rate_memory_write(dev, B43_OFDM_RATE_54MB, 1);
                if (dev->phy.type == B43_PHYTYPE_A)
                        break;
                /* fallthrough */
        case B43_PHYTYPE_B:
                b43_rate_memory_write(dev, B43_CCK_RATE_1MB, 0);
                b43_rate_memory_write(dev, B43_CCK_RATE_2MB, 0);
                b43_rate_memory_write(dev, B43_CCK_RATE_5MB, 0);
                b43_rate_memory_write(dev, B43_CCK_RATE_11MB, 0);
                break;
        default:
                B43_WARN_ON(1);
        }
}

/* Set the default values for the PHY TX Control Words. */
static void b43_set_phytxctl_defaults(struct b43_wldev *dev)
{
        u16 ctl = 0;

        ctl |= B43_TXH_PHY_ENC_CCK;
        ctl |= B43_TXH_PHY_ANT01AUTO;
        ctl |= B43_TXH_PHY_TXPWR;

        b43_shm_write16(dev, B43_SHM_SHARED, B43_SHM_SH_BEACPHYCTL, ctl);
        b43_shm_write16(dev, B43_SHM_SHARED, B43_SHM_SH_ACKCTSPHYCTL, ctl);
        b43_shm_write16(dev, B43_SHM_SHARED, B43_SHM_SH_PRPHYCTL, ctl);
}

/* Set the TX-Antenna for management frames sent by firmware. */
static void b43_mgmtframe_txantenna(struct b43_wldev *dev, int antenna)
{
        u16 ant;
        u16 tmp;

        ant = b43_antenna_to_phyctl(antenna);

        /* For ACK/CTS */
        tmp = b43_shm_read16(dev, B43_SHM_SHARED, B43_SHM_SH_ACKCTSPHYCTL);
        tmp = (tmp & ~B43_TXH_PHY_ANT) | ant;
        b43_shm_write16(dev, B43_SHM_SHARED, B43_SHM_SH_ACKCTSPHYCTL, tmp);
        /* For Probe Resposes */
        tmp = b43_shm_read16(dev, B43_SHM_SHARED, B43_SHM_SH_PRPHYCTL);
        tmp = (tmp & ~B43_TXH_PHY_ANT) | ant;
        b43_shm_write16(dev, B43_SHM_SHARED, B43_SHM_SH_PRPHYCTL, tmp);
}

/* This is the opposite of b43_chip_init() */
static void b43_chip_exit(struct b43_wldev *dev)
{
        b43_phy_exit(dev);
        b43_gpio_cleanup(dev);
        /* firmware is released later */
}

/* Initialize the chip
 * http://bcm-specs.sipsolutions.net/ChipInit
 */
static int b43_chip_init(struct b43_wldev *dev)
{
        struct b43_phy *phy = &dev->phy;
        int err;
        u32 value32, macctl;
        u16 value16;

        /* Initialize the MAC control */
        macctl = B43_MACCTL_IHR_ENABLED | B43_MACCTL_SHM_ENABLED;
        if (dev->phy.gmode)
                macctl |= B43_MACCTL_GMODE;
        macctl |= B43_MACCTL_INFRA;
        b43_write32(dev, B43_MMIO_MACCTL, macctl);

        err = b43_request_firmware(dev);
        if (err)
                goto out;
        err = b43_upload_microcode(dev);
        if (err)
                goto out;       /* firmware is released later */

        err = b43_gpio_init(dev);
        if (err)
                goto out;       /* firmware is released later */

        err = b43_upload_initvals(dev);
        if (err)
                goto err_gpio_clean;

        /* Turn the Analog on and initialize the PHY. */
        phy->ops->switch_analog(dev, 1);
        err = b43_phy_init(dev);
        if (err)
                goto err_gpio_clean;

        /* Disable Interference Mitigation. */
        if (phy->ops->interf_mitigation)
                phy->ops->interf_mitigation(dev, B43_INTERFMODE_NONE);

        /* Select the antennae */
        if (phy->ops->set_rx_antenna)
                phy->ops->set_rx_antenna(dev, B43_ANTENNA_DEFAULT);
        b43_mgmtframe_txantenna(dev, B43_ANTENNA_DEFAULT);

        if (phy->type == B43_PHYTYPE_B) {
                value16 = b43_read16(dev, 0x005E);
                value16 |= 0x0004;
                b43_write16(dev, 0x005E, value16);
        }
        b43_write32(dev, 0x0100, 0x01000000);
        if (dev->dev->id.revision < 5)
                b43_write32(dev, 0x010C, 0x01000000);

        b43_write32(dev, B43_MMIO_MACCTL, b43_read32(dev, B43_MMIO_MACCTL)
                    & ~B43_MACCTL_INFRA);
        b43_write32(dev, B43_MMIO_MACCTL, b43_read32(dev, B43_MMIO_MACCTL)
                    | B43_MACCTL_INFRA);

        /* Probe Response Timeout value */
        /* FIXME: Default to 0, has to be set by ioctl probably... :-/ */
        b43_shm_write16(dev, B43_SHM_SHARED, 0x0074, 0x0000);

        /* Initially set the wireless operation mode. */
        b43_adjust_opmode(dev);

        if (dev->dev->id.revision < 3) {
                b43_write16(dev, 0x060E, 0x0000);
                b43_write16(dev, 0x0610, 0x8000);
                b43_write16(dev, 0x0604, 0x0000);
                b43_write16(dev, 0x0606, 0x0200);
        } else {
                b43_write32(dev, 0x0188, 0x80000000);
                b43_write32(dev, 0x018C, 0x02000000);
        }
        b43_write32(dev, B43_MMIO_GEN_IRQ_REASON, 0x00004000);
        b43_write32(dev, B43_MMIO_DMA0_IRQ_MASK, 0x0001DC00);
        b43_write32(dev, B43_MMIO_DMA1_IRQ_MASK, 0x0000DC00);
        b43_write32(dev, B43_MMIO_DMA2_IRQ_MASK, 0x0000DC00);
        b43_write32(dev, B43_MMIO_DMA3_IRQ_MASK, 0x0001DC00);
        b43_write32(dev, B43_MMIO_DMA4_IRQ_MASK, 0x0000DC00);
        b43_write32(dev, B43_MMIO_DMA5_IRQ_MASK, 0x0000DC00);

        value32 = ssb_read32(dev->dev, SSB_TMSLOW);
        value32 |= 0x00100000;
        ssb_write32(dev->dev, SSB_TMSLOW, value32);

        b43_write16(dev, B43_MMIO_POWERUP_DELAY,
                    dev->dev->bus->chipco.fast_pwrup_delay);

        err = 0;
        b43dbg(dev->wl, "Chip initialized\n");
out:
        return err;

err_gpio_clean:
        b43_gpio_cleanup(dev);
        return err;
}

static void b43_periodic_every60sec(struct b43_wldev *dev)
{
        const struct b43_phy_operations *ops = dev->phy.ops;

        if (ops->pwork_60sec)
                ops->pwork_60sec(dev);

        /* Force check the TX power emission now. */
        b43_phy_txpower_check(dev, B43_TXPWR_IGNORE_TIME);
}

static void b43_periodic_every30sec(struct b43_wldev *dev)
{
        /* Update device statistics. */
        b43_calculate_link_quality(dev);
}

static void b43_periodic_every15sec(struct b43_wldev *dev)
{
        struct b43_phy *phy = &dev->phy;
        u16 wdr;

        if (dev->fw.opensource) {
                /* Check if the firmware is still alive.
                 * It will reset the watchdog counter to 0 in its idle loop. */
                wdr = b43_shm_read16(dev, B43_SHM_SCRATCH, B43_WATCHDOG_REG);
                if (unlikely(wdr)) {
                        b43err(dev->wl, "Firmware watchdog: The firmware died!\n");
                        b43_controller_restart(dev, "Firmware watchdog");
                        return;
                } else {
                        b43_shm_write16(dev, B43_SHM_SCRATCH,
                                        B43_WATCHDOG_REG, 1);
                }
        }

        if (phy->ops->pwork_15sec)
                phy->ops->pwork_15sec(dev);

        atomic_set(&phy->txerr_cnt, B43_PHY_TX_BADNESS_LIMIT);
        wmb();
}

static void do_periodic_work(struct b43_wldev *dev)
{
        unsigned int state;

        state = dev->periodic_state;
        if (state % 4 == 0)
                b43_periodic_every60sec(dev);
        if (state % 2 == 0)
                b43_periodic_every30sec(dev);
        b43_periodic_every15sec(dev);
}

/* Periodic work locking policy:
 *      The whole periodic work handler is protected by
 *      wl->mutex. If another lock is needed somewhere in the
 *      pwork callchain, it's aquired in-place, where it's needed.
 */
static void b43_periodic_work_handler(struct work_struct *work)
{
        struct b43_wldev *dev = container_of(work, struct b43_wldev,
                                             periodic_work.work);
        struct b43_wl *wl = dev->wl;
        unsigned long delay;

        mutex_lock(&wl->mutex);

        if (unlikely(b43_status(dev) != B43_STAT_STARTED))
                goto out;
        if (b43_debug(dev, B43_DBG_PWORK_STOP))
                goto out_requeue;

        do_periodic_work(dev);

        dev->periodic_state++;
out_requeue:
        if (b43_debug(dev, B43_DBG_PWORK_FAST))
                delay = msecs_to_jiffies(50);
        else
                delay = round_jiffies_relative(HZ * 15);
        queue_delayed_work(wl->hw->workqueue, &dev->periodic_work, delay);
out:
        mutex_unlock(&wl->mutex);
}

static void b43_periodic_tasks_setup(struct b43_wldev *dev)
{
        struct delayed_work *work = &dev->periodic_work;

        dev->periodic_state = 0;
        INIT_DELAYED_WORK(work, b43_periodic_work_handler);
        queue_delayed_work(dev->wl->hw->workqueue, work, 0);
}

/* Check if communication with the device works correctly. */
static int b43_validate_chipaccess(struct b43_wldev *dev)
{
        u32 v, backup;

        backup = b43_shm_read32(dev, B43_SHM_SHARED, 0);

        /* Check for read/write and endianness problems. */
        b43_shm_write32(dev, B43_SHM_SHARED, 0, 0x55AAAA55);
        if (b43_shm_read32(dev, B43_SHM_SHARED, 0) != 0x55AAAA55)
                goto error;
        b43_shm_write32(dev, B43_SHM_SHARED, 0, 0xAA5555AA);
        if (b43_shm_read32(dev, B43_SHM_SHARED, 0) != 0xAA5555AA)
                goto error;

        b43_shm_write32(dev, B43_SHM_SHARED, 0, backup);

        if ((dev->dev->id.revision >= 3) && (dev->dev->id.revision <= 10)) {
                /* The 32bit register shadows the two 16bit registers
                 * with update sideeffects. Validate this. */
                b43_write16(dev, B43_MMIO_TSF_CFP_START, 0xAAAA);
                b43_write32(dev, B43_MMIO_TSF_CFP_START, 0xCCCCBBBB);
                if (b43_read16(dev, B43_MMIO_TSF_CFP_START_LOW) != 0xBBBB)
                        goto error;
                if (b43_read16(dev, B43_MMIO_TSF_CFP_START_HIGH) != 0xCCCC)
                        goto error;
        }
        b43_write32(dev, B43_MMIO_TSF_CFP_START, 0);

        v = b43_read32(dev, B43_MMIO_MACCTL);
        v |= B43_MACCTL_GMODE;
        if (v != (B43_MACCTL_GMODE | B43_MACCTL_IHR_ENABLED))
                goto error;

        return 0;
error:
        b43err(dev->wl, "Failed to validate the chipaccess\n");
        return -ENODEV;
}

static void b43_security_init(struct b43_wldev *dev)
{
        dev->max_nr_keys = (dev->dev->id.revision >= 5) ? 58 : 20;
        B43_WARN_ON(dev->max_nr_keys > ARRAY_SIZE(dev->key));
        dev->ktp = b43_shm_read16(dev, B43_SHM_SHARED, B43_SHM_SH_KTP);
        /* KTP is a word address, but we address SHM bytewise.
         * So multiply by two.
         */
        dev->ktp *= 2;
        if (dev->dev->id.revision >= 5) {
                /* Number of RCMTA address slots */
                b43_write16(dev, B43_MMIO_RCMTA_COUNT, dev->max_nr_keys - 8);
        }
        b43_clear_keys(dev);
}

static int b43_rng_read(struct hwrng *rng, u32 * data)
{
        struct b43_wl *wl = (struct b43_wl *)rng->priv;
        unsigned long flags;

        /* Don't take wl->mutex here, as it could deadlock with
         * hwrng internal locking. It's not needed to take
         * wl->mutex here, anyway. */

        spin_lock_irqsave(&wl->irq_lock, flags);
        *data = b43_read16(wl->current_dev, B43_MMIO_RNG);
        spin_unlock_irqrestore(&wl->irq_lock, flags);

        return (sizeof(u16));
}

static void b43_rng_exit(struct b43_wl *wl)
{
        if (wl->rng_initialized)
                hwrng_unregister(&wl->rng);
}

static int b43_rng_init(struct b43_wl *wl)
{
        int err;

        snprintf(wl->rng_name, ARRAY_SIZE(wl->rng_name),
                 "%s_%s", KBUILD_MODNAME, wiphy_name(wl->hw->wiphy));
        wl->rng.name = wl->rng_name;
        wl->rng.data_read = b43_rng_read;
        wl->rng.priv = (unsigned long)wl;
        wl->rng_initialized = 1;
        err = hwrng_register(&wl->rng);
        if (err) {
                wl->rng_initialized = 0;
                b43err(wl, "Failed to register the random "
                       "number generator (%d)\n", err);
        }

        return err;
}

static int b43_op_tx(struct ieee80211_hw *hw,
                     struct sk_buff *skb)
{
        struct b43_wl *wl = hw_to_b43_wl(hw);
        struct b43_wldev *dev = wl->current_dev;
        unsigned long flags;
        int err;

        if (unlikely(skb->len < 2 + 2 + 6)) {
                /* Too short, this can't be a valid frame. */
                goto drop_packet;
        }
        B43_WARN_ON(skb_shinfo(skb)->nr_frags);
        if (unlikely(!dev))
                goto drop_packet;