// SPDX-License-Identifier: GPL-2.0-or-later
/*
 *
 *  Broadcom B43legacy wireless driver
 *
 *  Copyright (c) 2005 Martin Langer <martin-langer@gmx.de>
 *  Copyright (c) 2005-2008 Stefano Brivio <stefano.brivio@polimi.it>
 *  Copyright (c) 2005, 2006 Michael Buesch <m@bues.ch>
 *  Copyright (c) 2005 Danny van Dyk <kugelfang@gentoo.org>
 *  Copyright (c) 2005 Andreas Jaggi <andreas.jaggi@waterwave.ch>
 *  Copyright (c) 2007 Larry Finger <Larry.Finger@lwfinger.net>
 *
 *  Some parts of the code in this file are derived from the ipw2200
 *  driver  Copyright(c) 2003 - 2004 Intel Corporation.

 */

#include <linux/delay.h>
#include <linux/init.h>
#include <linux/module.h>
#include <linux/if_arp.h>
#include <linux/etherdevice.h>
#include <linux/firmware.h>
#include <linux/workqueue.h>
#include <linux/sched/signal.h>
#include <linux/skbuff.h>
#include <linux/dma-mapping.h>
#include <linux/slab.h>
#include <net/dst.h>
#include <asm/unaligned.h>

#include "b43legacy.h"
#include "main.h"
#include "debugfs.h"
#include "phy.h"
#include "dma.h"
#include "pio.h"
#include "sysfs.h"
#include "xmit.h"
#include "radio.h"


MODULE_DESCRIPTION("Broadcom B43legacy wireless driver");
MODULE_AUTHOR("Martin Langer");
MODULE_AUTHOR("Stefano Brivio");
MODULE_AUTHOR("Michael Buesch");
MODULE_LICENSE("GPL");

MODULE_FIRMWARE("b43legacy/ucode2.fw");
MODULE_FIRMWARE("b43legacy/ucode4.fw");

#if defined(CONFIG_B43LEGACY_DMA) && defined(CONFIG_B43LEGACY_PIO)
static int modparam_pio;
module_param_named(pio, modparam_pio, int, 0444);
MODULE_PARM_DESC(pio, "enable(1) / disable(0) PIO mode");
#elif defined(CONFIG_B43LEGACY_DMA)
# define modparam_pio   0
#elif defined(CONFIG_B43LEGACY_PIO)
# define modparam_pio   1
#endif

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 firmware files to load.");

/* The following table supports BCM4301, BCM4303 and BCM4306/2 devices. */
static const struct ssb_device_id b43legacy_ssb_tbl[] = {
        SSB_DEVICE(SSB_VENDOR_BROADCOM, SSB_DEV_80211, 2),
        SSB_DEVICE(SSB_VENDOR_BROADCOM, SSB_DEV_80211, 4),
        {},
};
MODULE_DEVICE_TABLE(ssb, b43legacy_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        = B43legacy_RATE_TO_100KBPS(_rateid),   \
                .hw_value       = (_rateid),                            \
                .flags          = (_flags),                             \
        }
/*
 * NOTE: When changing this, sync with xmit.c's
 *       b43legacy_plcp_get_bitrate_idx_* functions!
 */
static struct ieee80211_rate __b43legacy_ratetable[] = {
        RATETAB_ENT(B43legacy_CCK_RATE_1MB, 0),
        RATETAB_ENT(B43legacy_CCK_RATE_2MB, IEEE80211_RATE_SHORT_PREAMBLE),
        RATETAB_ENT(B43legacy_CCK_RATE_5MB, IEEE80211_RATE_SHORT_PREAMBLE),
        RATETAB_ENT(B43legacy_CCK_RATE_11MB, IEEE80211_RATE_SHORT_PREAMBLE),
        RATETAB_ENT(B43legacy_OFDM_RATE_6MB, 0),
        RATETAB_ENT(B43legacy_OFDM_RATE_9MB, 0),
        RATETAB_ENT(B43legacy_OFDM_RATE_12MB, 0),
        RATETAB_ENT(B43legacy_OFDM_RATE_18MB, 0),
        RATETAB_ENT(B43legacy_OFDM_RATE_24MB, 0),
        RATETAB_ENT(B43legacy_OFDM_RATE_36MB, 0),
        RATETAB_ENT(B43legacy_OFDM_RATE_48MB, 0),
        RATETAB_ENT(B43legacy_OFDM_RATE_54MB, 0),
};
#define b43legacy_b_ratetable           (__b43legacy_ratetable + 0)
#define b43legacy_b_ratetable_size      4
#define b43legacy_g_ratetable           (__b43legacy_ratetable + 0)
#define b43legacy_g_ratetable_size      12

#define CHANTAB_ENT(_chanid, _freq) \
        {                                                       \
                .center_freq    = (_freq),                      \
                .hw_value       = (_chanid),                    \
        }
static struct ieee80211_channel b43legacy_bg_chantable[] = {
        CHANTAB_ENT(1, 2412),
        CHANTAB_ENT(2, 2417),
        CHANTAB_ENT(3, 2422),
        CHANTAB_ENT(4, 2427),
        CHANTAB_ENT(5, 2432),
        CHANTAB_ENT(6, 2437),
        CHANTAB_ENT(7, 2442),
        CHANTAB_ENT(8, 2447),
        CHANTAB_ENT(9, 2452),
        CHANTAB_ENT(10, 2457),
        CHANTAB_ENT(11, 2462),
        CHANTAB_ENT(12, 2467),
        CHANTAB_ENT(13, 2472),
        CHANTAB_ENT(14, 2484),
};

static struct ieee80211_supported_band b43legacy_band_2GHz_BPHY = {
        .channels = b43legacy_bg_chantable,
        .n_channels = ARRAY_SIZE(b43legacy_bg_chantable),
        .bitrates = b43legacy_b_ratetable,
        .n_bitrates = b43legacy_b_ratetable_size,
};

static struct ieee80211_supported_band b43legacy_band_2GHz_GPHY = {
        .channels = b43legacy_bg_chantable,
        .n_channels = ARRAY_SIZE(b43legacy_bg_chantable),
        .bitrates = b43legacy_g_ratetable,
        .n_bitrates = b43legacy_g_ratetable_size,
};

static void b43legacy_wireless_core_exit(struct b43legacy_wldev *dev);
static int b43legacy_wireless_core_init(struct b43legacy_wldev *dev);
static void b43legacy_wireless_core_stop(struct b43legacy_wldev *dev);
static int b43legacy_wireless_core_start(struct b43legacy_wldev *dev);


static int b43legacy_ratelimit(struct b43legacy_wl *wl)
{
        if (!wl || !wl->current_dev)
                return 1;
        if (b43legacy_status(wl->current_dev) < B43legacy_STAT_STARTED)
                return 1;
        /* We are up and running.
         * Ratelimit the messages to avoid DoS over the net. */
        return net_ratelimit();
}

void b43legacyinfo(struct b43legacy_wl *wl, const char *fmt, ...)
{
        struct va_format vaf;
        va_list args;

        if (!b43legacy_ratelimit(wl))
                return;

        va_start(args, fmt);

        vaf.fmt = fmt;
        vaf.va = &args;

        printk(KERN_INFO "b43legacy-%s: %pV",
               (wl && wl->hw) ? wiphy_name(wl->hw->wiphy) : "wlan", &vaf);

        va_end(args);
}

void b43legacyerr(struct b43legacy_wl *wl, const char *fmt, ...)
{
        struct va_format vaf;
        va_list args;

        if (!b43legacy_ratelimit(wl))
                return;

        va_start(args, fmt);

        vaf.fmt = fmt;
        vaf.va = &args;

        printk(KERN_ERR "b43legacy-%s ERROR: %pV",
               (wl && wl->hw) ? wiphy_name(wl->hw->wiphy) : "wlan", &vaf);

        va_end(args);
}

void b43legacywarn(struct b43legacy_wl *wl, const char *fmt, ...)
{
        struct va_format vaf;
        va_list args;

        if (!b43legacy_ratelimit(wl))
                return;

        va_start(args, fmt);

        vaf.fmt = fmt;
        vaf.va = &args;

        printk(KERN_WARNING "b43legacy-%s warning: %pV",
               (wl && wl->hw) ? wiphy_name(wl->hw->wiphy) : "wlan", &vaf);

        va_end(args);
}

#if B43legacy_DEBUG
void b43legacydbg(struct b43legacy_wl *wl, const char *fmt, ...)
{
        struct va_format vaf;
        va_list args;

        va_start(args, fmt);

        vaf.fmt = fmt;
        vaf.va = &args;

        printk(KERN_DEBUG "b43legacy-%s debug: %pV",
               (wl && wl->hw) ? wiphy_name(wl->hw->wiphy) : "wlan", &vaf);

        va_end(args);
}
#endif /* DEBUG */

static void b43legacy_ram_write(struct b43legacy_wldev *dev, u16 offset,
                                u32 val)
{
        u32 status;

        B43legacy_WARN_ON(offset % 4 != 0);

        status = b43legacy_read32(dev, B43legacy_MMIO_MACCTL);
        if (status & B43legacy_MACCTL_BE)
                val = swab32(val);

        b43legacy_write32(dev, B43legacy_MMIO_RAM_CONTROL, offset);
        b43legacy_write32(dev, B43legacy_MMIO_RAM_DATA, val);
}

static inline
void b43legacy_shm_control_word(struct b43legacy_wldev *dev,
                                u16 routing, u16 offset)
{
        u32 control;

        /* "offset" is the WORD offset. */

        control = routing;
        control <<= 16;
        control |= offset;
        b43legacy_write32(dev, B43legacy_MMIO_SHM_CONTROL, control);
}

u32 b43legacy_shm_read32(struct b43legacy_wldev *dev,
                       u16 routing, u16 offset)
{
        u32 ret;

        if (routing == B43legacy_SHM_SHARED) {
                B43legacy_WARN_ON((offset & 0x0001) != 0);
                if (offset & 0x0003) {
                        /* Unaligned access */
                        b43legacy_shm_control_word(dev, routing, offset >> 2);
                        ret = b43legacy_read16(dev,
                                B43legacy_MMIO_SHM_DATA_UNALIGNED);
                        ret <<= 16;
                        b43legacy_shm_control_word(dev, routing,
                                                     (offset >> 2) + 1);
                        ret |= b43legacy_read16(dev, B43legacy_MMIO_SHM_DATA);

                        return ret;
                }
                offset >>= 2;
        }
        b43legacy_shm_control_word(dev, routing, offset);
        ret = b43legacy_read32(dev, B43legacy_MMIO_SHM_DATA);

        return ret;
}

u16 b43legacy_shm_read16(struct b43legacy_wldev *dev,
                           u16 routing, u16 offset)
{
        u16 ret;

        if (routing == B43legacy_SHM_SHARED) {
                B43legacy_WARN_ON((offset & 0x0001) != 0);
                if (offset & 0x0003) {
                        /* Unaligned access */
                        b43legacy_shm_control_word(dev, routing, offset >> 2);
                        ret = b43legacy_read16(dev,
                                             B43legacy_MMIO_SHM_DATA_UNALIGNED);

                        return ret;
                }
                offset >>= 2;
        }
        b43legacy_shm_control_word(dev, routing, offset);
        ret = b43legacy_read16(dev, B43legacy_MMIO_SHM_DATA);

        return ret;
}

void b43legacy_shm_write32(struct b43legacy_wldev *dev,
                           u16 routing, u16 offset,
                           u32 value)
{
        if (routing == B43legacy_SHM_SHARED) {
                B43legacy_WARN_ON((offset & 0x0001) != 0);
                if (offset & 0x0003) {
                        /* Unaligned access */
                        b43legacy_shm_control_word(dev, routing, offset >> 2);
                        b43legacy_write16(dev,
                                          B43legacy_MMIO_SHM_DATA_UNALIGNED,
                                          (value >> 16) & 0xffff);
                        b43legacy_shm_control_word(dev, routing,
                                                   (offset >> 2) + 1);
                        b43legacy_write16(dev, B43legacy_MMIO_SHM_DATA,
                                          value & 0xffff);
                        return;
                }
                offset >>= 2;
        }
        b43legacy_shm_control_word(dev, routing, offset);
        b43legacy_write32(dev, B43legacy_MMIO_SHM_DATA, value);
}

void b43legacy_shm_write16(struct b43legacy_wldev *dev, u16 routing, u16 offset,
                           u16 value)
{
        if (routing == B43legacy_SHM_SHARED) {
                B43legacy_WARN_ON((offset & 0x0001) != 0);
                if (offset & 0x0003) {
                        /* Unaligned access */
                        b43legacy_shm_control_word(dev, routing, offset >> 2);
                        b43legacy_write16(dev,
                                          B43legacy_MMIO_SHM_DATA_UNALIGNED,
                                          value);
                        return;
                }
                offset >>= 2;
        }
        b43legacy_shm_control_word(dev, routing, offset);
        b43legacy_write16(dev, B43legacy_MMIO_SHM_DATA, value);
}

/* Read HostFlags */
u32 b43legacy_hf_read(struct b43legacy_wldev *dev)
{
        u32 ret;

        ret = b43legacy_shm_read16(dev, B43legacy_SHM_SHARED,
                                   B43legacy_SHM_SH_HOSTFHI);
        ret <<= 16;
        ret |= b43legacy_shm_read16(dev, B43legacy_SHM_SHARED,
                                    B43legacy_SHM_SH_HOSTFLO);

        return ret;
}

/* Write HostFlags */
void b43legacy_hf_write(struct b43legacy_wldev *dev, u32 value)
{
        b43legacy_shm_write16(dev, B43legacy_SHM_SHARED,
                              B43legacy_SHM_SH_HOSTFLO,
                              (value & 0x0000FFFF));
        b43legacy_shm_write16(dev, B43legacy_SHM_SHARED,
                              B43legacy_SHM_SH_HOSTFHI,
                              ((value & 0xFFFF0000) >> 16));
}

void b43legacy_tsf_read(struct b43legacy_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 (overflowed).
         */
        if (dev->dev->id.revision >= 3) {
                u32 low;
                u32 high;
                u32 high2;

                do {
                        high = b43legacy_read32(dev,
                                        B43legacy_MMIO_REV3PLUS_TSF_HIGH);
                        low = b43legacy_read32(dev,
                                        B43legacy_MMIO_REV3PLUS_TSF_LOW);
                        high2 = b43legacy_read32(dev,
                                        B43legacy_MMIO_REV3PLUS_TSF_HIGH);
                } while (unlikely(high != high2));

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

                do {
                        v3 = b43legacy_read16(dev, B43legacy_MMIO_TSF_3);
                        v2 = b43legacy_read16(dev, B43legacy_MMIO_TSF_2);
                        v1 = b43legacy_read16(dev, B43legacy_MMIO_TSF_1);
                        v0 = b43legacy_read16(dev, B43legacy_MMIO_TSF_0);

                        test3 = b43legacy_read16(dev, B43legacy_MMIO_TSF_3);
                        test2 = b43legacy_read16(dev, B43legacy_MMIO_TSF_2);
                        test1 = b43legacy_read16(dev, B43legacy_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 b43legacy_time_lock(struct b43legacy_wldev *dev)
{
        u32 status;

        status = b43legacy_read32(dev, B43legacy_MMIO_MACCTL);
        status |= B43legacy_MACCTL_TBTTHOLD;
        b43legacy_write32(dev, B43legacy_MMIO_MACCTL, status);
}

static void b43legacy_time_unlock(struct b43legacy_wldev *dev)
{
        u32 status;

        status = b43legacy_read32(dev, B43legacy_MMIO_MACCTL);
        status &= ~B43legacy_MACCTL_TBTTHOLD;
        b43legacy_write32(dev, B43legacy_MMIO_MACCTL, status);
}

static void b43legacy_tsf_write_locked(struct b43legacy_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;

                b43legacy_write32(dev, B43legacy_MMIO_REV3PLUS_TSF_LOW, 0);
                b43legacy_write32(dev, B43legacy_MMIO_REV3PLUS_TSF_HIGH,
                                    hi);
                b43legacy_write32(dev, B43legacy_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;

                b43legacy_write16(dev, B43legacy_MMIO_TSF_0, 0);
                b43legacy_write16(dev, B43legacy_MMIO_TSF_3, v3);
                b43legacy_write16(dev, B43legacy_MMIO_TSF_2, v2);
                b43legacy_write16(dev, B43legacy_MMIO_TSF_1, v1);
                b43legacy_write16(dev, B43legacy_MMIO_TSF_0, v0);
        }
}

void b43legacy_tsf_write(struct b43legacy_wldev *dev, u64 tsf)
{
        b43legacy_time_lock(dev);
        b43legacy_tsf_write_locked(dev, tsf);
        b43legacy_time_unlock(dev);
}

static
void b43legacy_macfilter_set(struct b43legacy_wldev *dev,
                             u16 offset, const u8 *mac)
{
        static const u8 zero_addr[ETH_ALEN] = { 0 };
        u16 data;

        if (!mac)
                mac = zero_addr;

        offset |= 0x0020;
        b43legacy_write16(dev, B43legacy_MMIO_MACFILTER_CONTROL, offset);

        data = mac[0];
        data |= mac[1] << 8;
        b43legacy_write16(dev, B43legacy_MMIO_MACFILTER_DATA, data);
        data = mac[2];
        data |= mac[3] << 8;
        b43legacy_write16(dev, B43legacy_MMIO_MACFILTER_DATA, data);
        data = mac[4];
        data |= mac[5] << 8;
        b43legacy_write16(dev, B43legacy_MMIO_MACFILTER_DATA, data);
}

static void b43legacy_write_mac_bssid_templates(struct b43legacy_wldev *dev)
{
        static const u8 zero_addr[ETH_ALEN] = { 0 };
        const u8 *mac = dev->wl->mac_addr;
        const u8 *bssid = dev->wl->bssid;
        u8 mac_bssid[ETH_ALEN * 2];
        int i;
        u32 tmp;

        if (!bssid)
                bssid = zero_addr;
        if (!mac)
                mac = zero_addr;

        b43legacy_macfilter_set(dev, B43legacy_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;
                b43legacy_ram_write(dev, 0x20 + i, tmp);
                b43legacy_ram_write(dev, 0x78 + i, tmp);
                b43legacy_ram_write(dev, 0x478 + i, tmp);
        }
}

static void b43legacy_upload_card_macaddress(struct b43legacy_wldev *dev)
{
        b43legacy_write_mac_bssid_templates(dev);
        b43legacy_macfilter_set(dev, B43legacy_MACFILTER_SELF,
                                dev->wl->mac_addr);
}

static void b43legacy_set_slot_time(struct b43legacy_wldev *dev,
                                    u16 slot_time)
{
        /* slot_time is in usec. */
        if (dev->phy.type != B43legacy_PHYTYPE_G)
                return;
        b43legacy_write16(dev, 0x684, 510 + slot_time);
        b43legacy_shm_write16(dev, B43legacy_SHM_SHARED, 0x0010,
                              slot_time);
}

static void b43legacy_short_slot_timing_enable(struct b43legacy_wldev *dev)
{
        b43legacy_set_slot_time(dev, 9);
}

static void b43legacy_short_slot_timing_disable(struct b43legacy_wldev *dev)
{
        b43legacy_set_slot_time(dev, 20);
}

/* 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 b43legacy_synchronize_irq(struct b43legacy_wldev *dev)
{
        synchronize_irq(dev->dev->irq);
        tasklet_kill(&dev->isr_tasklet);
}

/* DummyTransmission function, as documented on
 * https://bcm-specs.sipsolutions.net/DummyTransmission
 */
void b43legacy_dummy_transmission(struct b43legacy_wldev *dev)
{
        struct b43legacy_phy *phy = &dev->phy;
        unsigned int i;
        unsigned int max_loop;
        u16 value;
        u32 buffer[5] = {
                0x00000000,
                0x00D40000,
                0x00000000,
                0x01000000,
                0x00000000,
        };

        switch (phy->type) {
        case B43legacy_PHYTYPE_B:
        case B43legacy_PHYTYPE_G:
                max_loop = 0xFA;
                buffer[0] = 0x000B846E;
                break;
        default:
                B43legacy_BUG_ON(1);
                return;
        }

        for (i = 0; i < 5; i++)
                b43legacy_ram_write(dev, i * 4, buffer[i]);

        /* dummy read follows */
        b43legacy_read32(dev, B43legacy_MMIO_MACCTL);

        b43legacy_write16(dev, 0x0568, 0x0000);
        b43legacy_write16(dev, 0x07C0, 0x0000);
        b43legacy_write16(dev, 0x050C, 0x0000);
        b43legacy_write16(dev, 0x0508, 0x0000);
        b43legacy_write16(dev, 0x050A, 0x0000);
        b43legacy_write16(dev, 0x054C, 0x0000);
        b43legacy_write16(dev, 0x056A, 0x0014);
        b43legacy_write16(dev, 0x0568, 0x0826);
        b43legacy_write16(dev, 0x0500, 0x0000);
        b43legacy_write16(dev, 0x0502, 0x0030);

        if (phy->radio_ver == 0x2050 && phy->radio_rev <= 0x5)
                b43legacy_radio_write16(dev, 0x0051, 0x0017);
        for (i = 0x00; i < max_loop; i++) {
                value = b43legacy_read16(dev, 0x050E);
                if (value & 0x0080)
                        break;
                udelay(10);
        }
        for (i = 0x00; i < 0x0A; i++) {
                value = b43legacy_read16(dev, 0x050E);
                if (value & 0x0400)
                        break;
                udelay(10);
        }
        for (i = 0x00; i < 0x0A; i++) {
                value = b43legacy_read16(dev, 0x0690);
                if (!(value & 0x0100))
                        break;
                udelay(10);
        }
        if (phy->radio_ver == 0x2050 && phy->radio_rev <= 0x5)
                b43legacy_radio_write16(dev, 0x0051, 0x0037);
}

/* Turn the Analog ON/OFF */
static void b43legacy_switch_analog(struct b43legacy_wldev *dev, int on)
{
        b43legacy_write16(dev, B43legacy_MMIO_PHY0, on ? 0 : 0xF4);
}

void b43legacy_wireless_core_reset(struct b43legacy_wldev *dev, u32 flags)
{
        u32 tmslow;
        u32 macctl;

        flags |= B43legacy_TMSLOW_PHYCLKEN;
        flags |= B43legacy_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 &= ~B43legacy_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 */
        b43legacy_switch_analog(dev, 1);

        macctl = b43legacy_read32(dev, B43legacy_MMIO_MACCTL);
        macctl &= ~B43legacy_MACCTL_GMODE;
        if (flags & B43legacy_TMSLOW_GMODE) {
                macctl |= B43legacy_MACCTL_GMODE;
                dev->phy.gmode = true;
        } else
                dev->phy.gmode = false;
        macctl |= B43legacy_MACCTL_IHR_ENABLED;
        b43legacy_write32(dev, B43legacy_MMIO_MACCTL, macctl);
}

static void handle_irq_transmit_status(struct b43legacy_wldev *dev)
{
        u32 v0;
        u32 v1;
        u16 tmp;
        struct b43legacy_txstatus stat;

        while (1) {
                v0 = b43legacy_read32(dev, B43legacy_MMIO_XMITSTAT_0);
                if (!(v0 & 0x00000001))
                        break;
                v1 = b43legacy_read32(dev, B43legacy_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);

                b43legacy_handle_txstatus(dev, &stat);
        }
}

static void drain_txstatus_queue(struct b43legacy_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 = b43legacy_read32(dev, B43legacy_MMIO_XMITSTAT_0);
                if (!(dummy & 0x00000001))
                        break;
                dummy = b43legacy_read32(dev, B43legacy_MMIO_XMITSTAT_1);
        }
}

static u32 b43legacy_jssi_read(struct b43legacy_wldev *dev)
{
        u32 val = 0;

        val = b43legacy_shm_read16(dev, B43legacy_SHM_SHARED, 0x40A);
        val <<= 16;
        val |= b43legacy_shm_read16(dev, B43legacy_SHM_SHARED, 0x408);

        return val;
}

static void b43legacy_jssi_write(struct b43legacy_wldev *dev, u32 jssi)
{
        b43legacy_shm_write16(dev, B43legacy_SHM_SHARED, 0x408,
                              (jssi & 0x0000FFFF));
        b43legacy_shm_write16(dev, B43legacy_SHM_SHARED, 0x40A,
                              (jssi & 0xFFFF0000) >> 16);
}

static void b43legacy_generate_noise_sample(struct b43legacy_wldev *dev)
{
        b43legacy_jssi_write(dev, 0x7F7F7F7F);
        b43legacy_write32(dev, B43legacy_MMIO_MACCMD,
                          b43legacy_read32(dev, B43legacy_MMIO_MACCMD)
                          | B43legacy_MACCMD_BGNOISE);
        B43legacy_WARN_ON(dev->noisecalc.channel_at_start !=
                            dev->phy.channel);
}

static void b43legacy_calculate_link_quality(struct b43legacy_wldev *dev)
{
        /* Top half of Link Quality calculation. */

        if (dev->noisecalc.calculation_running)
                return;
        dev->noisecalc.channel_at_start = dev->phy.channel;
        dev->noisecalc.calculation_running = true;
        dev->noisecalc.nr_samples = 0;

        b43legacy_generate_noise_sample(dev);
}

static void handle_irq_noise(struct b43legacy_wldev *dev)
{
        struct b43legacy_phy *phy = &dev->phy;
        u16 tmp;
        u8 noise[4];
        u8 i;
        u8 j;
        s32 average;

        /* Bottom half of Link Quality calculation. */

        B43legacy_WARN_ON(!dev->noisecalc.calculation_running);
        if (dev->noisecalc.channel_at_start != phy->channel)
                goto drop_calculation;
        *((__le32 *)noise) = cpu_to_le32(b43legacy_jssi_read(dev));
        if (noise[0] == 0x7F || noise[1] == 0x7F ||
            noise[2] == 0x7F || noise[3] == 0x7F)
                goto generate_new;

        /* Get the noise samples. */
        B43legacy_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 = b43legacy_shm_read16(dev, B43legacy_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;
drop_calculation:
                dev->noisecalc.calculation_running = false;
                return;
        }
generate_new:
        b43legacy_generate_noise_sample(dev);
}

static void handle_irq_tbtt_indication(struct b43legacy_wldev *dev)
{
        if (b43legacy_is_mode(dev->wl, NL80211_IFTYPE_AP)) {
                /* TODO: PS TBTT */
        } else {
                if (1/*FIXME: the last PSpoll frame was sent successfully */)
                        b43legacy_power_saving_ctl_bits(dev, -1, -1);
        }
        if (b43legacy_is_mode(dev->wl, NL80211_IFTYPE_ADHOC))
                dev->dfq_valid = true;
}

static void handle_irq_atim_end(struct b43legacy_wldev *dev)
{
        if (dev->dfq_valid) {
                b43legacy_write32(dev, B43legacy_MMIO_MACCMD,
                                  b43legacy_read32(dev, B43legacy_MMIO_MACCMD)
                                  | B43legacy_MACCMD_DFQ_VALID);
                dev->dfq_valid = false;
        }
}

static void handle_irq_pmq(struct b43legacy_wldev *dev)
{
        u32 tmp;

        /* TODO: AP mode. */

        while (1) {
                tmp = b43legacy_read32(dev, B43legacy_MMIO_PS_STATUS);
                if (!(tmp & 0x00000008))
                        break;
        }
        /* 16bit write is odd, but correct. */
        b43legacy_write16(dev, B43legacy_MMIO_PS_STATUS, 0x0002);
}

static void b43legacy_write_template_common(struct b43legacy_wldev *dev,
                                            const u8 *data, u16 size,
                                            u16 ram_offset,
                                            u16 shm_size_offset, u8 rate)
{
        u32 i;
        u32 tmp;
        struct b43legacy_plcp_hdr4 plcp;

        plcp.data = 0;
        b43legacy_generate_plcp_hdr(&plcp, size + FCS_LEN, rate);
        b43legacy_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;
        b43legacy_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;
                b43legacy_ram_write(dev, ram_offset + i - 2, tmp);
        }
        b43legacy_shm_write16(dev, B43legacy_SHM_SHARED, shm_size_offset,
                              size + sizeof(struct b43legacy_plcp_hdr6));
}

/* Convert a b43legacy antenna number value to the PHY TX control value. */
static u16 b43legacy_antenna_to_phyctl(int antenna)
{
        switch (antenna) {
        case B43legacy_ANTENNA0:
                return B43legacy_TX4_PHY_ANT0;
        case B43legacy_ANTENNA1:
                return B43legacy_TX4_PHY_ANT1;
        }
        return B43legacy_TX4_PHY_ANTLAST;
}

static void b43legacy_write_beacon_template(struct b43legacy_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 = false;
        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_t(size_t, dev->wl->current_beacon->len,
                  0x200 - sizeof(struct b43legacy_plcp_hdr6));
        rate = ieee80211_get_tx_rate(dev->wl->hw, info)->hw_value;

        b43legacy_write_template_common(dev, (const u8 *)bcn, len, ram_offset,
                                        shm_size_offset, rate);

        /* Write the PHY TX control parameters. */
        antenna = B43legacy_ANTENNA_DEFAULT;
        antenna = b43legacy_antenna_to_phyctl(antenna);
        ctl = b43legacy_shm_read16(dev, B43legacy_SHM_SHARED,
                                   B43legacy_SHM_SH_BEACPHYCTL);
        /* We can't send beacons with short preamble. Would get PHY errors. */
        ctl &= ~B43legacy_TX4_PHY_SHORTPRMBL;
        ctl &= ~B43legacy_TX4_PHY_ANT;
        ctl &= ~B43legacy_TX4_PHY_ENC;
        ctl |= antenna;
        ctl |= B43legacy_TX4_PHY_ENC_CCK;
        b43legacy_shm_write16(dev, B43legacy_SHM_SHARED,
                              B43legacy_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 = true;

                        tim_position = sizeof(struct b43legacy_plcp_hdr6);
                        tim_position += offsetof(struct ieee80211_mgmt,
                                                 u.beacon.variable);
                        tim_position += i;

                        dtim_period = ie[i + 3];

                        b43legacy_shm_write16(dev, B43legacy_SHM_SHARED,
                                        B43legacy_SHM_SH_TIMPOS, tim_position);
                        b43legacy_shm_write16(dev, B43legacy_SHM_SHARED,
                                        B43legacy_SHM_SH_DTIMP, dtim_period);
                        break;
                }
                i += ie_len + 2;
        }
        if (!tim_found) {
                b43legacywarn(dev->wl, "Did not find a valid TIM IE in the "
                              "beacon template packet. AP or IBSS operation "
                              "may be broken.\n");
        } else
                b43legacydbg(dev->wl, "Updated beacon template\n");
}

static void b43legacy_write_probe_resp_plcp(struct b43legacy_wldev *dev,
                                            u16 shm_offset, u16 size,
                                            struct ieee80211_rate *rate)
{
        struct b43legacy_plcp_hdr4 plcp;
        u32 tmp;
        __le16 dur;

        plcp.data = 0;
        b43legacy_generate_plcp_hdr(&plcp, size + FCS_LEN, rate->hw_value);
        dur = ieee80211_generic_frame_duration(dev->wl->hw,
                                               dev->wl->vif,
                                               NL80211_BAND_2GHZ,
                                               size,
                                               rate);
        /* Write PLCP in two parts and timing for packet transfer */
        tmp = le32_to_cpu(plcp.data);
        b43legacy_shm_write16(dev, B43legacy_SHM_SHARED, shm_offset,
                              tmp & 0xFFFF);
        b43legacy_shm_write16(dev, B43legacy_SHM_SHARED, shm_offset + 2,
                              tmp >> 16);
        b43legacy_shm_write16(dev, B43legacy_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 *b43legacy_generate_probe_resp(struct b43legacy_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);
        B43legacy_WARN_ON(ie_start != offsetof(struct ieee80211_mgmt,
                                               u.beacon.variable));

        if (B43legacy_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,
                                               NL80211_BAND_2GHZ,
                                               *dest_size,
                                               rate);
        hdr->duration_id = dur;

        return dest_data;
}

static void b43legacy_write_probe_resp_template(struct b43legacy_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 = b43legacy_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
         */
        b43legacy_write_probe_resp_plcp(dev, 0x31A, size,
                                        &b43legacy_b_ratetable[0]);
        b43legacy_write_probe_resp_plcp(dev, 0x32C, size,
                                        &b43legacy_b_ratetable[1]);
        b43legacy_write_probe_resp_plcp(dev, 0x33E, size,
                                        &b43legacy_b_ratetable[2]);
        b43legacy_write_probe_resp_plcp(dev, 0x350, size,
                                        &b43legacy_b_ratetable[3]);

        size = min_t(size_t, size,
                   0x200 - sizeof(struct b43legacy_plcp_hdr6));
        b43legacy_write_template_common(dev, probe_resp_data,
                                        size, ram_offset,
                                        shm_size_offset, rate->hw_value);
        kfree(probe_resp_data);
}

static void b43legacy_upload_beacon0(struct b43legacy_wldev *dev)
{
        struct b43legacy_wl *wl = dev->wl;

        if (wl->beacon0_uploaded)
                return;
        b43legacy_write_beacon_template(dev, 0x68, 0x18);
        /* FIXME: Probe resp upload doesn't really belong here,
         *        but we don't use that feature anyway. */
        b43legacy_write_probe_resp_template(dev, 0x268, 0x4A,
                                      &__b43legacy_ratetable[3]);
        wl->beacon0_uploaded = true;
}

static void b43legacy_upload_beacon1(struct b43legacy_wldev *dev)
{
        struct b43legacy_wl *wl = dev->wl;

        if (wl->beacon1_uploaded)
                return;
        b43legacy_write_beacon_template(dev, 0x468, 0x1A);
        wl->beacon1_uploaded = true;
}

static void handle_irq_beacon(struct b43legacy_wldev *dev)
{
        struct b43legacy_wl *wl = dev->wl;
        u32 cmd, beacon0_valid, beacon1_valid;

        if (!b43legacy_is_mode(wl, NL80211_IFTYPE_AP))
                return;

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

        /* Ignore interrupt in the future. */
        dev->irq_mask &= ~B43legacy_IRQ_BEACON;

        cmd = b43legacy_read32(dev, B43legacy_MMIO_MACCMD);
        beacon0_valid = (cmd & B43legacy_MACCMD_BEACON0_VALID);
        beacon1_valid = (cmd & B43legacy_MACCMD_BEACON1_VALID);

        /* Schedule interrupt manually, if busy. */
        if (beacon0_valid && beacon1_valid) {
                b43legacy_write32(dev, B43legacy_MMIO_GEN_IRQ_REASON, B43legacy_IRQ_BEACON);
                dev->irq_mask |= B43legacy_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 = false;
                b43legacy_upload_beacon0(dev);
                b43legacy_upload_beacon1(dev);
                cmd = b43legacy_read32(dev, B43legacy_MMIO_MACCMD);
                cmd |= B43legacy_MACCMD_BEACON0_VALID;
                b43legacy_write32(dev, B43legacy_MMIO_MACCMD, cmd);
        } else {
                if (!beacon0_valid) {
                        b43legacy_upload_beacon0(dev);
                        cmd = b43legacy_read32(dev, B43legacy_MMIO_MACCMD);
                        cmd |= B43legacy_MACCMD_BEACON0_VALID;
                        b43legacy_write32(dev, B43legacy_MMIO_MACCMD, cmd);
                } else if (!beacon1_valid) {
                        b43legacy_upload_beacon1(dev);
                        cmd = b43legacy_read32(dev, B43legacy_MMIO_MACCMD);
                        cmd |= B43legacy_MACCMD_BEACON1_VALID;
                        b43legacy_write32(dev, B43legacy_MMIO_MACCMD, cmd);
                }
        }
}

static void b43legacy_beacon_update_trigger_work(struct work_struct *work)
{
        struct b43legacy_wl *wl = container_of(work, struct b43legacy_wl,
                                         beacon_update_trigger);
        struct b43legacy_wldev *dev;

        mutex_lock(&wl->mutex);
        dev = wl->current_dev;
        if (likely(dev && (b43legacy_status(dev) >= B43legacy_STAT_INITIALIZED))) {
                spin_lock_irq(&wl->irq_lock);
                /* Update beacon right away or defer to IRQ. */
                handle_irq_beacon(dev);
                /* The handler might have updated the IRQ mask. */
                b43legacy_write32(dev, B43legacy_MMIO_GEN_IRQ_MASK,
                                  dev->irq_mask);
                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 b43legacy_update_templates(struct b43legacy_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 = false;
        wl->beacon1_uploaded = false;
        ieee80211_queue_work(wl->hw, &wl->beacon_update_trigger);
}

static void b43legacy_set_beacon_int(struct b43legacy_wldev *dev,
                                     u16 beacon_int)
{
        b43legacy_time_lock(dev);
        if (dev->dev->id.revision >= 3) {
                b43legacy_write32(dev, B43legacy_MMIO_TSF_CFP_REP,
                                 (beacon_int << 16));
                b43legacy_write32(dev, B43legacy_MMIO_TSF_CFP_START,
                                 (beacon_int << 10));
        } else {
                b43legacy_write16(dev, 0x606, (beacon_int >> 6));
                b43legacy_write16(dev, 0x610, beacon_int);
        }
        b43legacy_time_unlock(dev);
        b43legacydbg(dev->wl, "Set beacon interval to %u\n", beacon_int);
}

static void handle_irq_ucode_debug(struct b43legacy_wldev *dev)
{
}

/* Interrupt handler bottom-half */
static void b43legacy_interrupt_tasklet(struct tasklet_struct *t)
{
        struct b43legacy_wldev *dev = from_tasklet(dev, t, isr_tasklet);
        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);

        B43legacy_WARN_ON(b43legacy_status(dev) <
                          B43legacy_STAT_INITIALIZED);

        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 & B43legacy_IRQ_MAC_TXERR))
                b43legacyerr(dev->wl, "MAC transmission error\n");

        if (unlikely(reason & B43legacy_IRQ_PHY_TXERR)) {
                b43legacyerr(dev->wl, "PHY transmission error\n");
                rmb();
                if (unlikely(atomic_dec_and_test(&dev->phy.txerr_cnt))) {
                        b43legacyerr(dev->wl, "Too many PHY TX errors, "
                                              "restarting the controller\n");
                        b43legacy_controller_restart(dev, "PHY TX errors");
                }
        }

        if (unlikely(merged_dma_reason & (B43legacy_DMAIRQ_FATALMASK |
                                          B43legacy_DMAIRQ_NONFATALMASK))) {
                if (merged_dma_reason & B43legacy_DMAIRQ_FATALMASK) {
                        b43legacyerr(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]);
                        b43legacy_controller_restart(dev, "DMA error");
                        spin_unlock_irqrestore(&dev->wl->irq_lock, flags);
                        return;
                }
                if (merged_dma_reason & B43legacy_DMAIRQ_NONFATALMASK)
                        b43legacyerr(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 & B43legacy_IRQ_UCODE_DEBUG))
                handle_irq_ucode_debug(dev);
        if (reason & B43legacy_IRQ_TBTT_INDI)
                handle_irq_tbtt_indication(dev);
        if (reason & B43legacy_IRQ_ATIM_END)
                handle_irq_atim_end(dev);
        if (reason & B43legacy_IRQ_BEACON)
                handle_irq_beacon(dev);
        if (reason & B43legacy_IRQ_PMQ)
                handle_irq_pmq(dev);
        if (reason & B43legacy_IRQ_TXFIFO_FLUSH_OK) {
                ;/*TODO*/
        }
        if (reason & B43legacy_IRQ_NOISESAMPLE_OK)
                handle_irq_noise(dev);

        /* Check the DMA reason registers for received data. */
        if (dma_reason[0] & B43legacy_DMAIRQ_RX_DONE) {
                if (b43legacy_using_pio(dev))
                        b43legacy_pio_rx(dev->pio.queue0);
                else
                        b43legacy_dma_rx(dev->dma.rx_ring0);
        }
        B43legacy_WARN_ON(dma_reason[1] & B43legacy_DMAIRQ_RX_DONE);
        B43legacy_WARN_ON(dma_reason[2] & B43legacy_DMAIRQ_RX_DONE);
        if (dma_reason[3] & B43legacy_DMAIRQ_RX_DONE) {
                if (b43legacy_using_pio(dev))
                        b43legacy_pio_rx(dev->pio.queue3);
                else
                        b43legacy_dma_rx(dev->dma.rx_ring3);
        }
        B43legacy_WARN_ON(dma_reason[4] & B43legacy_DMAIRQ_RX_DONE);
        B43legacy_WARN_ON(dma_reason[5] & B43legacy_DMAIRQ_RX_DONE);

        if (reason & B43legacy_IRQ_TX_OK)
                handle_irq_transmit_status(dev);

        b43legacy_write32(dev, B43legacy_MMIO_GEN_IRQ_MASK, dev->irq_mask);
        spin_unlock_irqrestore(&dev->wl->irq_lock, flags);
}

static void pio_irq_workaround(struct b43legacy_wldev *dev,
                               u16 base, int queueidx)
{
        u16 rxctl;

        rxctl = b43legacy_read16(dev, base + B43legacy_PIO_RXCTL);
        if (rxctl & B43legacy_PIO_RXCTL_DATAAVAILABLE)
                dev->dma_reason[queueidx] |= B43legacy_DMAIRQ_RX_DONE;
        else
                dev->dma_reason[queueidx] &= ~B43legacy_DMAIRQ_RX_DONE;
}

static void b43legacy_interrupt_ack(struct b43legacy_wldev *dev, u32 reason)
{
        if (b43legacy_using_pio(dev) &&
            (dev->dev->id.revision < 3) &&
            (!(reason & B43legacy_IRQ_PIO_WORKAROUND))) {
                /* Apply a PIO specific workaround to the dma_reasons */
                pio_irq_workaround(dev, B43legacy_MMIO_PIO1_BASE, 0);
                pio_irq_workaround(dev, B43legacy_MMIO_PIO2_BASE, 1);
                pio_irq_workaround(dev, B43legacy_MMIO_PIO3_BASE, 2);
                pio_irq_workaround(dev, B43legacy_MMIO_PIO4_BASE, 3);
        }

        b43legacy_write32(dev, B43legacy_MMIO_GEN_IRQ_REASON, reason);

        b43legacy_write32(dev, B43legacy_MMIO_DMA0_REASON,
                          dev->dma_reason[0]);
        b43legacy_write32(dev, B43legacy_MMIO_DMA1_REASON,
                          dev->dma_reason[1]);
        b43legacy_write32(dev, B43legacy_MMIO_DMA2_REASON,
                          dev->dma_reason[2]);
        b43legacy_write32(dev, B43legacy_MMIO_DMA3_REASON,
                          dev->dma_reason[3]);
        b43legacy_write32(dev, B43legacy_MMIO_DMA4_REASON,
                          dev->dma_reason[4]);
        b43legacy_write32(dev, B43legacy_MMIO_DMA5_REASON,
                          dev->dma_reason[5]);
}

/* Interrupt handler top-half */
static irqreturn_t b43legacy_interrupt_handler(int irq, void *dev_id)
{
        irqreturn_t ret = IRQ_NONE;
        struct b43legacy_wldev *dev = dev_id;
        u32 reason;

        B43legacy_WARN_ON(!dev);

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

        if (unlikely(b43legacy_status(dev) < B43legacy_STAT_STARTED))
                /* This can only happen on shared IRQ lines. */
                goto out;
        reason = b43legacy_read32(dev, B43legacy_MMIO_GEN_IRQ_REASON);
        if (reason == 0xffffffff) /* shared IRQ */
                goto out;
        ret = IRQ_HANDLED;
        reason &= dev->irq_mask;
        if (!reason)
                goto out;

        dev->dma_reason[0] = b43legacy_read32(dev,
                                              B43legacy_MMIO_DMA0_REASON)
                                              & 0x0001DC00;
        dev->dma_reason[1] = b43legacy_read32(dev,
                                              B43legacy_MMIO_DMA1_REASON)
                                              & 0x0000DC00;
        dev->dma_reason[2] = b43legacy_read32(dev,
                                              B43legacy_MMIO_DMA2_REASON)
                                              & 0x0000DC00;
        dev->dma_reason[3] = b43legacy_read32(dev,
                                              B43legacy_MMIO_DMA3_REASON)
                                              & 0x0001DC00;
        dev->dma_reason[4] = b43legacy_read32(dev,
                                              B43legacy_MMIO_DMA4_REASON)
                                              & 0x0000DC00;
        dev->dma_reason[5] = b43legacy_read32(dev,
                                              B43legacy_MMIO_DMA5_REASON)
                                              & 0x0000DC00;

        b43legacy_interrupt_ack(dev, reason);
        /* Disable all IRQs. They are enabled again in the bottom half. */
        b43legacy_write32(dev, B43legacy_MMIO_GEN_IRQ_MASK, 0);
        /* Save the reason code and call our bottom half. */
        dev->irq_reason = reason;
        tasklet_schedule(&dev->isr_tasklet);
out:
        spin_unlock(&dev->wl->irq_lock);

        return ret;
}

static void b43legacy_release_firmware(struct b43legacy_wldev *dev)
{
        release_firmware(dev->fw.ucode);
        dev->fw.ucode = NULL;
        release_firmware(dev->fw.pcm);
        dev->fw.pcm = NULL;
        release_firmware(dev->fw.initvals);
        dev->fw.initvals = NULL;
        release_firmware(dev->fw.initvals_band);
        dev->fw.initvals_band = NULL;
}

static void b43legacy_print_fw_helptext(struct b43legacy_wl *wl)
{
        b43legacyerr(wl, "You must go to https://wireless.wiki.kernel.org/en/"
                     "users/Drivers/b43#devicefirmware "
                     "and download the correct firmware (version 3).\n");
}

static void b43legacy_fw_cb(const struct firmware *firmware, void *context)
{
        struct b43legacy_wldev *dev = context;

        dev->fwp = firmware;
        complete(&dev->fw_load_complete);
}

static int do_request_fw(struct b43legacy_wldev *dev,
                         const char *name,
                         const struct firmware **fw, bool async)
{
        char path[sizeof(modparam_fwpostfix) + 32];
        struct b43legacy_fw_header *hdr;
        u32 size;
        int err;

        if (!name)
                return 0;

        snprintf(path, ARRAY_SIZE(path),
                 "b43legacy%s/%s.fw",
                 modparam_fwpostfix, name);
        b43legacyinfo(dev->wl, "Loading firmware %s\n", path);
        if (async) {
                init_completion(&dev->fw_load_complete);
                err = request_firmware_nowait(THIS_MODULE, 1, path,
                                              dev->dev->dev, GFP_KERNEL,
                                              dev, b43legacy_fw_cb);
                if (err) {
                        b43legacyerr(dev->wl, "Unable to load firmware\n");
                        return err;
                }
                /* stall here until fw ready */
                wait_for_completion(&dev->fw_load_complete);
                if (!dev->fwp)
                        err = -EINVAL;
                *fw = dev->fwp;
        } else {
                err = request_firmware(fw, path, dev->dev->dev);
        }
        if (err) {
                b43legacyerr(dev->wl, "Firmware file \"%s\" not found "
                       "or load failed.\n", path);
                return err;
        }
        if ((*fw)->size < sizeof(struct b43legacy_fw_header))
                goto err_format;
        hdr = (struct b43legacy_fw_header *)((*fw)->data);
        switch (hdr->type) {
        case B43legacy_FW_TYPE_UCODE:
        case B43legacy_FW_TYPE_PCM:
                size = be32_to_cpu(hdr->size);
                if (size != (*fw)->size - sizeof(struct b43legacy_fw_header))
                        goto err_format;
                fallthrough;
        case B43legacy_FW_TYPE_IV:
                if (hdr->ver != 1)
                        goto err_format;
                break;
        default:
                goto err_format;
        }

        return err;

err_format:
        b43legacyerr(dev->wl, "Firmware file \"%s\" format error.\n", path);
        return -EPROTO;
}

static int b43legacy_one_core_attach(struct ssb_device *dev,
                                     struct b43legacy_wl *wl);
static void b43legacy_one_core_detach(struct ssb_device *dev);

static void b43legacy_request_firmware(struct work_struct *work)
{
        struct b43legacy_wl *wl = container_of(work,
                                  struct b43legacy_wl, firmware_load);
        struct b43legacy_wldev *dev = wl->current_dev;
        struct b43legacy_firmware *fw = &dev->fw;
        const u8 rev = dev->dev->id.revision;
        const char *filename;
        int err;

        if (!fw->ucode) {
                if (rev == 2)
                        filename = "ucode2";
                else if (rev == 4)
                        filename = "ucode4";
                else
                        filename = "ucode5";
                err = do_request_fw(dev, filename, &fw->ucode, true);
                if (err)
                        goto err_load;
        }
        if (!fw->pcm) {
                if (rev < 5)
                        filename = "pcm4";
                else
                        filename = "pcm5";
                err = do_request_fw(dev, filename, &fw->pcm, false);
                if (err)
                        goto err_load;
        }
        if (!fw->initvals) {
                switch (dev->phy.type) {
                case B43legacy_PHYTYPE_B:
                case B43legacy_PHYTYPE_G:
                        if ((rev >= 5) && (rev <= 10))
                                filename = "b0g0initvals5";
                        else if (rev == 2 || rev == 4)
                                filename = "b0g0initvals2";
                        else
                                goto err_no_initvals;
                        break;
                default:
                        goto err_no_initvals;
                }
                err = do_request_fw(dev, filename, &fw->initvals, false);
                if (err)
                        goto err_load;
        }
        if (!fw->initvals_band) {
                switch (dev->phy.type) {
                case B43legacy_PHYTYPE_B:
                case B43legacy_PHYTYPE_G:
                        if ((rev >= 5) && (rev <= 10))
                                filename = "b0g0bsinitvals5";
                        else if (rev >= 11)
                                filename = NULL;
                        else if (rev == 2 || rev == 4)
                                filename = NULL;
                        else
                                goto err_no_initvals;
                        break;
                default:
                        goto err_no_initvals;
                }
                err = do_request_fw(dev, filename, &fw->initvals_band, false);
                if (err)
                        goto err_load;
        }
        err = ieee80211_register_hw(wl->hw);
        if (err)
                goto err_one_core_detach;
        return;

err_one_core_detach:
        b43legacy_one_core_detach(dev->dev);
        goto error;

err_load:
        b43legacy_print_fw_helptext(dev->wl);
        goto error;

err_no_initvals:
        err = -ENODEV;
        b43legacyerr(dev->wl, "No Initial Values firmware file for PHY %u, "
               "core rev %u\n", dev->phy.type, rev);
        goto error;

error:
        b43legacy_release_firmware(dev);
        return;
}

static int b43legacy_upload_microcode(struct b43legacy_wldev *dev)
{
        struct wiphy *wiphy = dev->wl->hw->wiphy;
        const size_t hdr_len = sizeof(struct b43legacy_fw_header);
        const __be32 *data;
        unsigned int i;
        unsigned int len;
        u16 fwrev;
        u16 fwpatch;
        u16 fwdate;
        u16 fwtime;
        u32 tmp, macctl;
        int err = 0;

        /* Jump the microcode PSM to offset 0 */
        macctl = b43legacy_read32(dev, B43legacy_MMIO_MACCTL);
        B43legacy_WARN_ON(macctl & B43legacy_MACCTL_PSM_RUN);
        macctl |= B43legacy_MACCTL_PSM_JMP0;
        b43legacy_write32(dev, B43legacy_MMIO_MACCTL, macctl);
        /* Zero out all microcode PSM registers and shared memory. */
        for (i = 0; i < 64; i++)
                b43legacy_shm_write16(dev, B43legacy_SHM_WIRELESS, i, 0);
        for (i = 0; i < 4096; i += 2)
                b43legacy_shm_write16(dev, B43legacy_SHM_SHARED, i, 0);

        /* Upload Microcode. */
        data = (__be32 *) (dev->fw.ucode->data + hdr_len);
        len = (dev->fw.ucode->size - hdr_len) / sizeof(__be32);
        b43legacy_shm_control_word(dev,
                                   B43legacy_SHM_UCODE |
                                   B43legacy_SHM_AUTOINC_W,
                                   0x0000);
        for (i = 0; i < len; i++) {
                b43legacy_write32(dev, B43legacy_MMIO_SHM_DATA,
                                    be32_to_cpu(data[i]));
                udelay(10);
        }

        if (dev->fw.pcm) {
                /* Upload PCM data. */
                data = (__be32 *) (dev->fw.pcm->data + hdr_len);
                len = (dev->fw.pcm->size - hdr_len) / sizeof(__be32);
                b43legacy_shm_control_word(dev, B43legacy_SHM_HW, 0x01EA);
                b43legacy_write32(dev, B43legacy_MMIO_SHM_DATA, 0x00004000);
                /* No need for autoinc bit in SHM_HW */
                b43legacy_shm_control_word(dev, B43legacy_SHM_HW, 0x01EB);
                for (i = 0; i < len; i++) {
                        b43legacy_write32(dev, B43legacy_MMIO_SHM_DATA,
                                          be32_to_cpu(data[i]));
                        udelay(10);
                }
        }

        b43legacy_write32(dev, B43legacy_MMIO_GEN_IRQ_REASON,
                          B43legacy_IRQ_ALL);

        /* Start the microcode PSM */
        macctl = b43legacy_read32(dev, B43legacy_MMIO_MACCTL);
        macctl &= ~B43legacy_MACCTL_PSM_JMP0;
        macctl |= B43legacy_MACCTL_PSM_RUN;
        b43legacy_write32(dev, B43legacy_MMIO_MACCTL, macctl);

        /* Wait for the microcode to load and respond */
        i = 0;
        while (1) {
                tmp = b43legacy_read32(dev, B43legacy_MMIO_GEN_IRQ_REASON);
                if (tmp == B43legacy_IRQ_MAC_SUSPENDED)
                        break;
                i++;
                if (i >= B43legacy_IRQWAIT_MAX_RETRIES) {
                        b43legacyerr(dev->wl, "Microcode not responding\n");
                        b43legacy_print_fw_helptext(dev->wl);
                        err = -ENODEV;
                        goto error;
                }
                msleep_interruptible(50);
                if (signal_pending(current)) {
                        err = -EINTR;
                        goto error;
                }
        }
        /* dummy read follows */
        b43legacy_read32(dev, B43legacy_MMIO_GEN_IRQ_REASON);

        /* Get and check the revisions. */
        fwrev = b43legacy_shm_read16(dev, B43legacy_SHM_SHARED,
                                     B43legacy_SHM_SH_UCODEREV);
        fwpatch = b43legacy_shm_read16(dev, B43legacy_SHM_SHARED,
                                       B43legacy_SHM_SH_UCODEPATCH);
        fwdate = b43legacy_shm_read16(dev, B43legacy_SHM_SHARED,
                                      B43legacy_SHM_SH_UCODEDATE);
        fwtime = b43legacy_shm_read16(dev, B43legacy_SHM_SHARED,
                                      B43legacy_SHM_SH_UCODETIME);

        if (fwrev > 0x128) {
                b43legacyerr(dev->wl, "YOU ARE TRYING TO LOAD V4 FIRMWARE."
                             " Only firmware from binary drivers version 3.x"
                             " is supported. You must change your firmware"
                             " files.\n");
                b43legacy_print_fw_helptext(dev->wl);
                err = -EOPNOTSUPP;
                goto error;
        }
        b43legacyinfo(dev->wl, "Loading firmware version 0x%X, patch level %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);

        dev->fw.rev = fwrev;
        dev->fw.patch = fwpatch;

        snprintf(wiphy->fw_version, sizeof(wiphy->fw_version), "%u.%u",
                        dev->fw.rev, dev->fw.patch);
        wiphy->hw_version = dev->dev->id.coreid;

        return 0;

error:
        macctl = b43legacy_read32(dev, B43legacy_MMIO_MACCTL);
        macctl &= ~B43legacy_MACCTL_PSM_RUN;
        macctl |= B43legacy_MACCTL_PSM_JMP0;
        b43legacy_write32(dev, B43legacy_MMIO_MACCTL, macctl);

        return err;
}

static int b43legacy_write_initvals(struct b43legacy_wldev *dev,
                                    const struct b43legacy_iv *ivals,
                                    size_t count,
                                    size_t array_size)
{
        const struct b43legacy_iv *iv;
        u16 offset;
        size_t i;
        bool bit32;

        BUILD_BUG_ON(sizeof(struct b43legacy_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 & B43legacy_IV_32BIT);
                offset &= B43legacy_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);
                        b43legacy_write32(dev, offset, value);

                        iv = (const struct b43legacy_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);
                        b43legacy_write16(dev, offset, value);

                        iv = (const struct b43legacy_iv *)((const uint8_t *)iv +
                                                        sizeof(__be16) +
                                                        sizeof(__be16));
                }
        }
        if (array_size)
                goto err_format;

        return 0;

err_format:
        b43legacyerr(dev->wl, "Initial Values Firmware file-format error.\n");
        b43legacy_print_fw_helptext(dev->wl);

        return -EPROTO;
}

static int b43legacy_upload_initvals(struct b43legacy_wldev *dev)
{
        const size_t hdr_len = sizeof(struct b43legacy_fw_header);
        const struct b43legacy_fw_header *hdr;
        struct b43legacy_firmware *fw = &dev->fw;
        const struct b43legacy_iv *ivals;
        size_t count;
        int err;

        hdr = (const struct b43legacy_fw_header *)(fw->initvals->data);
        ivals = (const struct b43legacy_iv *)(fw->initvals->data + hdr_len);
        count = be32_to_cpu(hdr->size);
        err = b43legacy_write_initvals(dev, ivals, count,
                                 fw->initvals->size - hdr_len);
        if (err)
                goto out;
        if (fw->initvals_band) {
                hdr = (const struct b43legacy_fw_header *)
                      (fw->initvals_band->data);
                ivals = (const struct b43legacy_iv *)(fw->initvals_band->data
                        + hdr_len);
                count = be32_to_cpu(hdr->size);
                err = b43legacy_write_initvals(dev, ivals, count,
                                         fw->initvals_band->size - hdr_len);
                if (err)
                        goto out;
        }
out:

        return err;
}

/* Initialize the GPIOs
 * https://bcm-specs.sipsolutions.net/GPIO
 */
static int b43legacy_gpio_init(struct b43legacy_wldev *dev)
{
        struct ssb_bus *bus = dev->dev->bus;
        struct ssb_device *gpiodev, *pcidev = NULL;
        u32 mask;
        u32 set;

        b43legacy_write32(dev, B43legacy_MMIO_MACCTL,
                          b43legacy_read32(dev,
                          B43legacy_MMIO_MACCTL)
                          & 0xFFFF3FFF);

        b43legacy_write16(dev, B43legacy_MMIO_GPIO_MASK,
                          b43legacy_read16(dev,
                          B43legacy_MMIO_GPIO_MASK)
                          | 0x000F);

        mask = 0x0000001F;
        set = 0x0000000F;
        if (dev->dev->bus->chip_id == 0x4301) {
                mask |= 0x0060;
                set |= 0x0060;
        }
        if (dev->dev->bus->sprom.boardflags_lo & B43legacy_BFL_PACTRL) {
                b43legacy_write16(dev, B43legacy_MMIO_GPIO_MASK,
                                  b43legacy_read16(dev,
                                  B43legacy_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, B43legacy_GPIO_CONTROL,
                    (ssb_read32(gpiodev, B43legacy_GPIO_CONTROL)
                     & ~mask) | set);

        return 0;
}

/* Turn off all GPIO stuff. Call this on module unload, for example. */
static void b43legacy_gpio_cleanup(struct b43legacy_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, B43legacy_GPIO_CONTROL, 0);
}

/* http://bcm-specs.sipsolutions.net/EnableMac */
void b43legacy_mac_enable(struct b43legacy_wldev *dev)
{
        dev->mac_suspended--;
        B43legacy_WARN_ON(dev->mac_suspended < 0);
        B43legacy_WARN_ON(irqs_disabled());
        if (dev->mac_suspended == 0) {
                b43legacy_write32(dev, B43legacy_MMIO_MACCTL,
                                  b43legacy_read32(dev,
                                  B43legacy_MMIO_MACCTL)
                                  | B43legacy_MACCTL_ENABLED);
                b43legacy_write32(dev, B43legacy_MMIO_GEN_IRQ_REASON,
                                  B43legacy_IRQ_MAC_SUSPENDED);
                /* the next two are dummy reads */
                b43legacy_read32(dev, B43legacy_MMIO_MACCTL);
                b43legacy_read32(dev, B43legacy_MMIO_GEN_IRQ_REASON);
                b43legacy_power_saving_ctl_bits(dev, -1, -1);

                /* Re-enable IRQs. */
                spin_lock_irq(&dev->wl->irq_lock);
                b43legacy_write32(dev, B43legacy_MMIO_GEN_IRQ_MASK,
                                  dev->irq_mask);
                spin_unlock_irq(&dev->wl->irq_lock);
        }
}

/* https://bcm-specs.sipsolutions.net/SuspendMAC */
void b43legacy_mac_suspend(struct b43legacy_wldev *dev)
{
        int i;
        u32 tmp;

        might_sleep();
        B43legacy_WARN_ON(irqs_disabled());
        B43legacy_WARN_ON(dev->mac_suspended < 0);

        if (dev->mac_suspended == 0) {
                /* Mask IRQs before suspending MAC. Otherwise
                 * the MAC stays busy and won't suspend. */
                spin_lock_irq(&dev->wl->irq_lock);
                b43legacy_write32(dev, B43legacy_MMIO_GEN_IRQ_MASK, 0);
                spin_unlock_irq(&dev->wl->irq_lock);
                b43legacy_synchronize_irq(dev);

                b43legacy_power_saving_ctl_bits(dev, -1, 1);
                b43legacy_write32(dev, B43legacy_MMIO_MACCTL,
                                  b43legacy_read32(dev,
                                  B43legacy_MMIO_MACCTL)
                                  & ~B43legacy_MACCTL_ENABLED);
                b43legacy_read32(dev, B43legacy_MMIO_GEN_IRQ_REASON);
                for (i = 40; i; i--) {
                        tmp = b43legacy_read32(dev,
                                               B43legacy_MMIO_GEN_IRQ_REASON);
                        if (tmp & B43legacy_IRQ_MAC_SUSPENDED)
                                goto out;
                        msleep(1);
                }
                b43legacyerr(dev->wl, "MAC suspend failed\n");
        }
out:
        dev->mac_suspended++;
}

static void b43legacy_adjust_opmode(struct b43legacy_wldev *dev)
{
        struct b43legacy_wl *wl = dev->wl;
        u32 ctl;
        u16 cfp_pretbtt;

        ctl = b43legacy_read32(dev, B43legacy_MMIO_MACCTL);
        /* Reset status to STA infrastructure mode. */
        ctl &= ~B43legacy_MACCTL_AP;
        ctl &= ~B43legacy_MACCTL_KEEP_CTL;
        ctl &= ~B43legacy_MACCTL_KEEP_BADPLCP;
        ctl &= ~B43legacy_MACCTL_KEEP_BAD;
        ctl &= ~B43legacy_MACCTL_PROMISC;
        ctl &= ~B43legacy_MACCTL_BEACPROMISC;
        ctl |= B43legacy_MACCTL_INFRA;

        if (b43legacy_is_mode(wl, NL80211_IFTYPE_AP))
                ctl |= B43legacy_MACCTL_AP;
        else if (b43legacy_is_mode(wl, NL80211_IFTYPE_ADHOC))
                ctl &= ~B43legacy_MACCTL_INFRA;

        if (wl->filter_flags & FIF_CONTROL)
                ctl |= B43legacy_MACCTL_KEEP_CTL;
        if (wl->filter_flags & FIF_FCSFAIL)
                ctl |= B43legacy_MACCTL_KEEP_BAD;
        if (wl->filter_flags & FIF_PLCPFAIL)
                ctl |= B43legacy_MACCTL_KEEP_BADPLCP;
        if (wl->filter_flags & FIF_BCN_PRBRESP_PROMISC)
                ctl |= B43legacy_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 |= B43legacy_MACCTL_PROMISC;

        b43legacy_write32(dev, B43legacy_MMIO_MACCTL, ctl);

        cfp_pretbtt = 2;
        if ((ctl & B43legacy_MACCTL_INFRA) &&
            !(ctl & B43legacy_MACCTL_AP)) {
                if (dev->dev->bus->chip_id == 0x4306 &&
                    dev->dev->bus->chip_rev == 3)
                        cfp_pretbtt = 100;
                else
                        cfp_pretbtt = 50;
        }
        b43legacy_write16(dev, 0x612, cfp_pretbtt);
}

static void b43legacy_rate_memory_write(struct b43legacy_wldev *dev,
                                        u16 rate,
                                        int is_ofdm)
{
        u16 offset;

        if (is_ofdm) {
                offset = 0x480;
                offset += (b43legacy_plcp_get_ratecode_ofdm(rate) & 0x000F) * 2;
        } else {
                offset = 0x4C0;
                offset += (b43legacy_plcp_get_ratecode_cck(rate) & 0x000F) * 2;
        }
        b43legacy_shm_write16(dev, B43legacy_SHM_SHARED, offset + 0x20,
                              b43legacy_shm_read16(dev,
                              B43legacy_SHM_SHARED, offset));
}

static void b43legacy_rate_memory_init(struct b43legacy_wldev *dev)
{
        switch (dev->phy.type) {
        case B43legacy_PHYTYPE_G:
                b43legacy_rate_memory_write(dev, B43legacy_OFDM_RATE_6MB, 1);
                b43legacy_rate_memory_write(dev, B43legacy_OFDM_RATE_12MB, 1);
                b43legacy_rate_memory_write(dev, B43legacy_OFDM_RATE_18MB, 1);
                b43legacy_rate_memory_write(dev, B43legacy_OFDM_RATE_24MB, 1);
                b43legacy_rate_memory_write(dev, B43legacy_OFDM_RATE_36MB, 1);
                b43legacy_rate_memory_write(dev, B43legacy_OFDM_RATE_48MB, 1);
                b43legacy_rate_memory_write(dev, B43legacy_OFDM_RATE_54MB, 1);
                fallthrough;
        case B43legacy_PHYTYPE_B:
                b43legacy_rate_memory_write(dev, B43legacy_CCK_RATE_1MB, 0);
                b43legacy_rate_memory_write(dev, B43legacy_CCK_RATE_2MB, 0);
                b43legacy_rate_memory_write(dev, B43legacy_CCK_RATE_5MB, 0);
                b43legacy_rate_memory_write(dev, B43legacy_CCK_RATE_11MB, 0);
                break;
        default:
                B43legacy_BUG_ON(1);
        }
}

/* Set the TX-Antenna for management frames sent by firmware. */
static void b43legacy_mgmtframe_txantenna(struct b43legacy_wldev *dev,
                                          int antenna)
{
        u16 ant = 0;
        u16 tmp;

        switch (antenna) {
        case B43legacy_ANTENNA0:
                ant |= B43legacy_TX4_PHY_ANT0;
                break;
        case B43legacy_ANTENNA1:
                ant |= B43legacy_TX4_PHY_ANT1;
                break;
        case B43legacy_ANTENNA_AUTO:
                ant |= B43legacy_TX4_PHY_ANTLAST;
                break;
        default:
                B43legacy_BUG_ON(1);
        }

        /* FIXME We also need to set the other flags of the PHY control
         * field somewhere. */

        /* For Beacons */
        tmp = b43legacy_shm_read16(dev, B43legacy_SHM_SHARED,
                                   B43legacy_SHM_SH_BEACPHYCTL);
        tmp = (tmp & ~B43legacy_TX4_PHY_ANT) | ant;
        b43legacy_shm_write16(dev, B43legacy_SHM_SHARED,
                              B43legacy_SHM_SH_BEACPHYCTL, tmp);
        /* For ACK/CTS */
        tmp = b43legacy_shm_read16(dev, B43legacy_SHM_SHARED,
                                   B43legacy_SHM_SH_ACKCTSPHYCTL);
        tmp = (tmp & ~B43legacy_TX4_PHY_ANT) | ant;
        b43legacy_shm_write16(dev, B43legacy_SHM_SHARED,
                              B43legacy_SHM_SH_ACKCTSPHYCTL, tmp);
        /* For Probe Resposes */
        tmp = b43legacy_shm_read16(dev, B43legacy_SHM_SHARED,
                                   B43legacy_SHM_SH_PRPHYCTL);
        tmp = (tmp & ~B43legacy_TX4_PHY_ANT) | ant;
        b43legacy_shm_write16(dev, B43legacy_SHM_SHARED,
                              B43legacy_SHM_SH_PRPHYCTL, tmp);
}

/* This is the opposite of b43legacy_chip_init() */
static void b43legacy_chip_exit(struct b43legacy_wldev *dev)
{
        b43legacy_radio_turn_off(dev, 1);
        b43legacy_gpio_cleanup(dev);
        /* firmware is released later */
}

/* Initialize the chip
 * https://bcm-specs.sipsolutions.net/ChipInit
 */
static int b43legacy_chip_init(struct b43legacy_wldev *dev)
{
        struct b43legacy_phy *phy = &dev->phy;
        int err;
        int tmp;
        u32 value32, macctl;
        u16 value16;

        /* Initialize the MAC control */
        macctl = B43legacy_MACCTL_IHR_ENABLED | B43legacy_MACCTL_SHM_ENABLED;
        if (dev->phy.gmode)
                macctl |= B43legacy_MACCTL_GMODE;
        macctl |= B43legacy_MACCTL_INFRA;
        b43legacy_write32(dev, B43legacy_MMIO_MACCTL, macctl);

        err = b43legacy_upload_microcode(dev);
        if (err)
                goto out; /* firmware is released later */

        err = b43legacy_gpio_init(dev);
        if (err)
                goto out; /* firmware is released later */

        err = b43legacy_upload_initvals(dev);
        if (err)
                goto err_gpio_clean;
        b43legacy_radio_turn_on(dev);

        b43legacy_write16(dev, 0x03E6, 0x0000);
        err = b43legacy_phy_init(dev);
        if (err)
                goto err_radio_off;

        /* Select initial Interference Mitigation. */
        tmp = phy->interfmode;
        phy->interfmode = B43legacy_INTERFMODE_NONE;
        b43legacy_radio_set_interference_mitigation(dev, tmp);

        b43legacy_phy_set_antenna_diversity(dev);
        b43legacy_mgmtframe_txantenna(dev, B43legacy_ANTENNA_DEFAULT);

        if (phy->type == B43legacy_PHYTYPE_B) {
                value16 = b43legacy_read16(dev, 0x005E);
                value16 |= 0x0004;
                b43legacy_write16(dev, 0x005E, value16);
        }
        b43legacy_write32(dev, 0x0100, 0x01000000);
        if (dev->dev->id.revision < 5)
                b43legacy_write32(dev, 0x010C, 0x01000000);

        value32 = b43legacy_read32(dev, B43legacy_MMIO_MACCTL);
        value32 &= ~B43legacy_MACCTL_INFRA;
        b43legacy_write32(dev, B43legacy_MMIO_MACCTL, value32);
        value32 = b43legacy_read32(dev, B43legacy_MMIO_MACCTL);
        value32 |= B43legacy_MACCTL_INFRA;
        b43legacy_write32(dev, B43legacy_MMIO_MACCTL, value32);

        if (b43legacy_using_pio(dev)) {
                b43legacy_write32(dev, 0x0210, 0x00000100);
                b43legacy_write32(dev, 0x0230, 0x00000100);
                b43legacy_write32(dev, 0x0250, 0x00000100);
                b43legacy_write32(dev, 0x0270, 0x00000100);
                b43legacy_shm_write16(dev, B43legacy_SHM_SHARED, 0x0034,
                                      0x0000);
        }

        /* Probe Response Timeout value */
        /* FIXME: Default to 0, has to be set by ioctl probably... :-/ */
        b43legacy_shm_write16(dev, B43legacy_SHM_SHARED, 0x0074, 0x0000);

        /* Initially set the wireless operation mode. */
        b43legacy_adjust_opmode(dev);

        if (dev->dev->id.revision < 3) {
                b43legacy_write16(dev, 0x060E, 0x0000);
                b43legacy_write16(dev, 0x0610, 0x8000);
                b43legacy_write16(dev, 0x0604, 0x0000);
                b43legacy_write16(dev, 0x0606, 0x0200);
        } else {
                b43legacy_write32(dev, 0x0188, 0x80000000);
                b43legacy_write32(dev, 0x018C, 0x02000000);
        }
        b43legacy_write32(dev, B43legacy_MMIO_GEN_IRQ_REASON, 0x00004000);
        b43legacy_write32(dev, B43legacy_MMIO_DMA0_IRQ_MASK, 0x0001DC00);
        b43legacy_write32(dev, B43legacy_MMIO_DMA1_IRQ_MASK, 0x0000DC00);
        b43legacy_write32(dev, B43legacy_MMIO_DMA2_IRQ_MASK, 0x0000DC00);
        b43legacy_write32(dev, B43legacy_MMIO_DMA3_IRQ_MASK, 0x0001DC00);
        b43legacy_write32(dev, B43legacy_MMIO_DMA4_IRQ_MASK, 0x0000DC00);
        b43legacy_write32(dev, B43legacy_MMIO_DMA5_IRQ_MASK, 0x0000DC00);

        value32 = ssb_read32(dev->dev, SSB_TMSLOW);
        value32 |= B43legacy_TMSLOW_MACPHYCLKEN;
        ssb_write32(dev->dev, SSB_TMSLOW, value32);

        b43legacy_write16(dev, B43legacy_MMIO_POWERUP_DELAY,
                          dev->dev->bus->chipco.fast_pwrup_delay);

        /* PHY TX errors counter. */
        atomic_set(&phy->txerr_cnt, B43legacy_PHY_TX_BADNESS_LIMIT);

        B43legacy_WARN_ON(err != 0);
        b43legacydbg(dev->wl, "Chip initialized\n");
out:
        return err;

err_radio_off:
        b43legacy_radio_turn_off(dev, 1);
err_gpio_clean:
        b43legacy_gpio_cleanup(dev);
        goto out;
}

static void b43legacy_periodic_every120sec(struct b43legacy_wldev *dev)
{
        struct b43legacy_phy *phy = &dev->phy;

        if (phy->type != B43legacy_PHYTYPE_G || phy->rev < 2)
                return;

        b43legacy_mac_suspend(dev);
        b43legacy_phy_lo_g_measure(dev);
        b43legacy_mac_enable(dev);
}

static void b43legacy_periodic_every60sec(struct b43legacy_wldev *dev)
{
        b43legacy_phy_lo_mark_all_unused(dev);
        if (dev->dev->bus->sprom.boardflags_lo & B43legacy_BFL_RSSI) {
                b43legacy_mac_suspend(dev);
                b43legacy_calc_nrssi_slope(dev);
                b43legacy_mac_enable(dev);
        }
}

static void b43legacy_periodic_every30sec(struct b43legacy_wldev *dev)
{
        /* Update device statistics. */
        b43legacy_calculate_link_quality(dev);
}

static void b43legacy_periodic_every15sec(struct b43legacy_wldev *dev)
{
        b43legacy_phy_xmitpower(dev); /* FIXME: unless scanning? */

        atomic_set(&dev->phy.txerr_cnt, B43legacy_PHY_TX_BADNESS_LIMIT);
        wmb();
}

static void do_periodic_work(struct b43legacy_wldev *dev)
{
        unsigned int state;

        state = dev->periodic_state;
        if (state % 8 == 0)
                b43legacy_periodic_every120sec(dev);
        if (state % 4 == 0)
                b43legacy_periodic_every60sec(dev);
        if (state % 2 == 0)
                b43legacy_periodic_every30sec(dev);
        b43legacy_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 acquired in-place, where it's needed.
 */
static void b43legacy_periodic_work_handler(struct work_struct *work)
{
        struct b43legacy_wldev *dev = container_of(work, struct b43legacy_wldev,
                                             periodic_work.work);
        struct b43legacy_wl *wl = dev->wl;
        unsigned long delay;

        mutex_lock(&wl->mutex);

        if (unlikely(b43legacy_status(dev) != B43legacy_STAT_STARTED))
                goto out;
        if (b43legacy_debug(dev, B43legacy_DBG_PWORK_STOP))
                goto out_requeue;

        do_periodic_work(dev);

        dev->periodic_state++;
out_requeue:
        if (b43legacy_debug(dev, B43legacy_DBG_PWORK_FAST))
                delay = msecs_to_jiffies(50);
        else
                delay = round_jiffies_relative(HZ * 15);
        ieee80211_queue_delayed_work(wl->hw, &dev->periodic_work, delay);
out:
        mutex_unlock(&wl->mutex);
}

static void b43legacy_periodic_tasks_setup(struct b43legacy_wldev *dev)
{
        struct delayed_work *work = &dev->periodic_work;

        dev->periodic_state = 0;
        INIT_DELAYED_WORK(work, b43legacy_periodic_work_handler);
        ieee80211_queue_delayed_work(dev->wl->hw, work, 0);
}

/* Validate access to the chip (SHM) */
static int b43legacy_validate_chipaccess(struct b43legacy_wldev *dev)
{
        u32 value;
        u32 shm_backup;

        shm_backup = b43legacy_shm_read32(dev, B43legacy_SHM_SHARED, 0);
        b43legacy_shm_write32(dev, B43legacy_SHM_SHARED, 0, 0xAA5555AA);
        if (b43legacy_shm_read32(dev, B43legacy_SHM_SHARED, 0) !=
                                 0xAA5555AA)
                goto error;
        b43legacy_shm_write32(dev, B43legacy_SHM_SHARED, 0, 0x55AAAA55);
        if (b43legacy_shm_read32(dev, B43legacy_SHM_SHARED, 0) !=
                                 0x55AAAA55)
                goto error;
        b43legacy_shm_write32(dev, B43legacy_SHM_SHARED, 0, shm_backup);

        value = b43legacy_read32(dev, B43legacy_MMIO_MACCTL);
        if ((value | B43legacy_MACCTL_GMODE) !=
            (B43legacy_MACCTL_GMODE | B43legacy_MACCTL_IHR_ENABLED))
                goto error;

        value = b43legacy_read32(dev, B43legacy_MMIO_GEN_IRQ_REASON);
        if (value)
                goto error;

        return 0;
error:
        b43legacyerr(dev->wl, "Failed to validate the chipaccess\n");
        return -ENODEV;
}

static void b43legacy_security_init(struct b43legacy_wldev *dev)
{
        dev->max_nr_keys = (dev->dev->id.revision >= 5) ? 58 : 20;
        B43legacy_WARN_ON(dev->max_nr_keys > ARRAY_SIZE(dev->key));
        dev->ktp = b43legacy_shm_read16(dev, B43legacy_SHM_SHARED,
                                        0x0056);
        /* 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 */
                b43legacy_write16(dev, B43legacy_MMIO_RCMTA_COUNT,
                                  dev->max_nr_keys - 8);
}

#ifdef CONFIG_B43LEGACY_HWRNG
static int b43legacy_rng_read(struct hwrng *rng, u32 *data)
{
        struct b43legacy_wl *wl = (struct b43legacy_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 = b43legacy_read16(wl->current_dev, B43legacy_MMIO_RNG);
        spin_unlock_irqrestore(&wl->irq_lock, flags);

        return (sizeof(u16));
}
#endif

static void b43legacy_rng_exit(struct b43legacy_wl *wl)
{
#ifdef CONFIG_B43LEGACY_HWRNG
        if (wl->rng_initialized)
                hwrng_unregister(&wl->rng);
#endif
}

static int b43legacy_rng_init(struct b43legacy_wl *wl)
{
        int err = 0;

#ifdef CONFIG_B43LEGACY_HWRNG
        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 = b43legacy_rng_read;
        wl->rng.priv = (unsigned long)wl;
        wl->rng_initialized = 1;
        err = hwrng_register(&wl->rng);
        if (err) {
                wl->rng_initialized = 0;
                b43legacyerr(wl, "Failed to register the random "
                       "number generator (%d)\n", err);
        }

#endif
        return err;
}

static void b43legacy_tx_work(struct work_struct *work)
{
        struct b43legacy_wl *wl = container_of(work, struct b43legacy_wl,
                                  tx_work);
        struct b43legacy_wldev *dev;
        struct sk_buff *skb;
        int queue_num;
        int err = 0;

        mutex_lock(&wl->mutex);
        dev = wl->current_dev;
        if (unlikely(!dev || b43legacy_status(dev) < B43legacy_STAT_STARTED)) {
                mutex_unlock(&wl->mutex);
                return;
        }

        for (queue_num = 0; queue_num < B43legacy_QOS_QUEUE_NUM; queue_num++) {
                while (skb_queue_len(&wl->tx_queue[queue_num])) {
                        skb = skb_dequeue(&wl->tx_queue[queue_num]);
                        if (b43legacy_using_pio(dev))
                                err = b43legacy_pio_tx(dev, skb);
                        else
                                err = b43legacy_dma_tx(dev, skb);
                        if (err == -ENOSPC) {
                                wl->tx_queue_stopped[queue_num] = 1;
                                ieee80211_stop_queue(wl->hw, queue_num);
                                skb_queue_head(&wl->tx_queue[queue_num], skb);
                                break;
                        }
                        if (unlikely(err))
                                dev_kfree_skb(skb); /* Drop it */
                        err = 0;
                }

                if (!err)
                        wl->tx_queue_stopped[queue_num] = 0;
        }

        mutex_unlock(&wl->mutex);
}

static void b43legacy_op_tx(struct ieee80211_hw *hw,
                            struct ieee80211_tx_control *control,
                            struct sk_buff *skb)
{
        struct b43legacy_wl *wl = hw_to_b43legacy_wl(hw);

        if (unlikely(skb->len < 2 + 2 + 6)) {
                /* Too short, this can't be a valid frame. */
                dev_kfree_skb_any(skb);
                return;
        }
        B43legacy_WARN_ON(skb_shinfo(skb)->nr_frags);

        skb_queue_tail(&wl->tx_queue[skb->queue_mapping], skb);
        if (!wl->tx_queue_stopped[skb->queue_mapping])
                ieee80211_queue_work(wl->hw, &wl->tx_work);
        else
                ieee80211_stop_queue(wl->hw, skb->queue_mapping);
}

static int b43legacy_op_conf_tx(struct ieee80211_hw *hw,
                                struct ieee80211_vif *vif, u16 queue,
                                const struct ieee80211_tx_queue_params *params)
{
        return 0;
}

static int b43legacy_op_get_stats(struct ieee80211_hw *hw,
                                  struct ieee80211_low_level_stats *stats)
{
        struct b43legacy_wl *wl = hw_to_b43legacy_wl(hw);
        unsigned long flags;

        spin_lock_irqsave(&wl->irq_lock, flags);
        memcpy(stats, &wl->ieee_stats, sizeof(*stats));
        spin_unlock_irqrestore(&wl->irq_lock, flags);

        return 0;
}

static const char *phymode_to_string(unsigned int phymode)
{
        switch (phymode) {
        case B43legacy_PHYMODE_B:
                return "B";
        case B43legacy_PHYMODE_G:
                return "G";
        default:
                B43legacy_BUG_ON(1);
        }
        return "";
}

static int find_wldev_for_phymode(struct b43legacy_wl *wl,
                                  unsigned int phymode,
                                  struct b43legacy_wldev **dev,
                                  bool *gmode)
{
        struct b43legacy_wldev *d;

        list_for_each_entry(d, &wl->devlist, list) {
                if (d->phy.possible_phymodes & phymode) {
                        /* Ok, this device supports the PHY-mode.
                         * Set the gmode bit. */
                        *gmode = true;
                        *dev = d;

                        return 0;
                }
        }

        return -ESRCH;
}

static void b43legacy_put_phy_into_reset(struct b43legacy_wldev *dev)
{
        struct ssb_device *sdev = dev->dev;
        u32 tmslow;

        tmslow = ssb_read32(sdev, SSB_TMSLOW);
        tmslow &= ~B43legacy_TMSLOW_GMODE;
        tmslow |= B43legacy_TMSLOW_PHYRESET;
        tmslow |= SSB_TMSLOW_FGC;
        ssb_write32(sdev, SSB_TMSLOW, tmslow);
        msleep(1);

        tmslow = ssb_read32(sdev, SSB_TMSLOW);
        tmslow &= ~SSB_TMSLOW_FGC;
        tmslow |= B43legacy_TMSLOW_PHYRESET;
        ssb_write32(sdev, SSB_TMSLOW, tmslow);
        msleep(1);
}

/* Expects wl->mutex locked */
static int b43legacy_switch_phymode(struct b43legacy_wl *wl,
                                      unsigned int new_mode)
{
        struct b43legacy_wldev *up_dev;
        struct b43legacy_wldev *down_dev;
        int err;
        bool gmode = false;
        int prev_status;

        err = find_wldev_for_phymode(wl, new_mode, &up_dev, &gmode);
        if (err) {
                b43legacyerr(wl, "Could not find a device for %s-PHY mode\n",
                       phymode_to_string(new_mode));
                return err;
        }
        if ((up_dev == wl->current_dev) &&
            (!!wl->current_dev->phy.gmode == !!gmode))
                /* This device is already running. */
                return 0;
        b43legacydbg(wl, "Reconfiguring PHYmode to %s-PHY\n",
               phymode_to_string(new_mode));
        down_dev = wl->current_dev;

        prev_status = b43legacy_status(down_dev);
        /* Shutdown the currently running core. */
        if (prev_status >= B43legacy_STAT_STARTED)
                b43legacy_wireless_core_stop(down_dev);
        if (prev_status >= B43legacy_STAT_INITIALIZED)
                b43legacy_wireless_core_exit(down_dev);

        if (down_dev != up_dev)
                /* We switch to a different core, so we put PHY into
                 * RESET on the old core. */
                b43legacy_put_phy_into_reset(down_dev);

        /* Now start the new core. */
        up_dev->phy.gmode = gmode;
        if (prev_status >= B43legacy_STAT_INITIALIZED) {
                err = b43legacy_wireless_core_init(up_dev);
                if (err) {
                        b43legacyerr(wl, "Fatal: Could not initialize device"
                                     " for newly selected %s-PHY mode\n",
                                     phymode_to_string(new_mode));
                        goto init_failure;
                }
        }
        if (prev_status >= B43legacy_STAT_STARTED) {
                err = b43legacy_wireless_core_start(up_dev);
                if (err) {
                        b43legacyerr(wl, "Fatal: Could not start device for "
                               "newly selected %s-PHY mode\n",
                               phymode_to_string(new_mode));
                        b43legacy_wireless_core_exit(up_dev);
                        goto init_failure;
                }
        }
        B43legacy_WARN_ON(b43legacy_status(up_dev) != prev_status);

        b43legacy_shm_write32(up_dev, B43legacy_SHM_SHARED, 0x003E, 0);

        wl->current_dev = up_dev;

        return 0;
init_failure:
        /* Whoops, failed to init the new core. No core is operating now. */
        wl->current_dev = NULL;
        return err;
}

/* Write the short and long frame retry limit values. */
static void b43legacy_set_retry_limits(struct b43legacy_wldev *dev,
                                       unsigned int short_retry,
                                       unsigned int long_retry)
{
        /* The retry limit is a 4-bit counter. Enforce this to avoid overflowing
         * the chip-internal counter. */
        short_retry = min(short_retry, (unsigned int)0xF);
        long_retry = min(long_retry, (unsigned int)0xF);

        b43legacy_shm_write16(dev, B43legacy_SHM_WIRELESS, 0x0006, short_retry);
        b43legacy_shm_write16(dev, B43legacy_SHM_WIRELESS, 0x0007, long_retry);
}

static int b43legacy_op_dev_config(struct ieee80211_hw *hw,
                                   u32 changed)
{
        struct b43legacy_wl *wl = hw_to_b43legacy_wl(hw);
        struct b43legacy_wldev *dev;
        struct b43legacy_phy *phy;
        struct ieee80211_conf *conf = &hw->conf;
        unsigned long flags;
        unsigned int new_phymode = 0xFFFF;
        int antenna_tx;
        int err = 0;

        antenna_tx = B43legacy_ANTENNA_DEFAULT;

        mutex_lock(&wl->mutex);
        dev = wl->current_dev;
        phy = &dev->phy;

        if (changed & IEEE80211_CONF_CHANGE_RETRY_LIMITS)
                b43legacy_set_retry_limits(dev,
                                           conf->short_frame_max_tx_count,
                                           conf->long_frame_max_tx_count);
        changed &= ~IEEE80211_CONF_CHANGE_RETRY_LIMITS;
        if (!changed)
                goto out_unlock_mutex;

        /* Switch the PHY mode (if necessary). */
        switch (conf->chandef.chan->band) {
        case NL80211_BAND_2GHZ:
                if (phy->type == B43legacy_PHYTYPE_B)
                        new_phymode = B43legacy_PHYMODE_B;
                else
                        new_phymode = B43legacy_PHYMODE_G;
                break;
        default:
                B43legacy_WARN_ON(1);
        }
        err = b43legacy_switch_phymode(wl, new_phymode);
        if (err)
                goto out_unlock_mutex;

        /* Disable IRQs while reconfiguring the device.
         * This makes it possible to drop the spinlock throughout
         * the reconfiguration process. */
        spin_lock_irqsave(&wl->irq_lock, flags);
        if (b43legacy_status(dev) < B43legacy_STAT_STARTED) {
                spin_unlock_irqrestore(&wl->irq_lock, flags);
                goto out_unlock_mutex;
        }
        b43legacy_write32(dev, B43legacy_MMIO_GEN_IRQ_MASK, 0);
        spin_unlock_irqrestore(&wl->irq_lock, flags);
        b43legacy_synchronize_irq(dev);

        /* Switch to the requested channel.
         * The firmware takes care of races with the TX handler. */
        if (conf->chandef.chan->hw_value != phy->channel)
                b43legacy_radio_selectchannel(dev, conf->chandef.chan->hw_value,
                                              0);

        dev->wl->radiotap_enabled = !!(conf->flags & IEEE80211_CONF_MONITOR);

        /* Adjust the desired TX power level. */
        if (conf->power_level != 0) {
                if (conf->power_level != phy->power_level) {
                        phy->power_level = conf->power_level;
                        b43legacy_phy_xmitpower(dev);
                }
        }

        /* Antennas for RX and management frame TX. */
        b43legacy_mgmtframe_txantenna(dev, antenna_tx);

        if (wl->radio_enabled != phy->radio_on) {
                if (wl->radio_enabled) {
                        b43legacy_radio_turn_on(dev);
                        b43legacyinfo(dev->wl, "Radio turned on by software\n");
                        if (!dev->radio_hw_enable)
                                b43legacyinfo(dev->wl, "The hardware RF-kill"
                                              " button still turns the radio"
                                              " physically off. Press the"
                                              " button to turn it on.\n");
                } else {
                        b43legacy_radio_turn_off(dev, 0);
                        b43legacyinfo(dev->wl, "Radio turned off by"
                                      " software\n");
                }
        }

        spin_lock_irqsave(&wl->irq_lock, flags);
        b43legacy_write32(dev, B43legacy_MMIO_GEN_IRQ_MASK, dev->irq_mask);
        spin_unlock_irqrestore(&wl->irq_lock, flags);
out_unlock_mutex:
        mutex_unlock(&wl->mutex);

        return err;
}

static void b43legacy_update_basic_rates(struct b43legacy_wldev *dev, u32 brates)
{
        struct ieee80211_supported_band *sband =
                dev->wl->hw->wiphy->bands[NL80211_BAND_2GHZ];
        const struct ieee80211_rate *rate;
        int i;
        u16 basic, direct, offset, basic_offset, rateptr;

        for (i = 0; i < sband->n_bitrates; i++) {
                rate = &sband->bitrates[i];

                if (b43legacy_is_cck_rate(rate->hw_value)) {
                        direct = B43legacy_SHM_SH_CCKDIRECT;
                        basic = B43legacy_SHM_SH_CCKBASIC;
                        offset = b43legacy_plcp_get_ratecode_cck(rate->hw_value);
                        offset &= 0xF;
                } else {
                        direct = B43legacy_SHM_SH_OFDMDIRECT;
                        basic = B43legacy_SHM_SH_OFDMBASIC;
                        offset = b43legacy_plcp_get_ratecode_ofdm(rate->hw_value);
                        offset &= 0xF;
                }

                rate = ieee80211_get_response_rate(sband, brates, rate->bitrate);

                if (b43legacy_is_cck_rate(rate->hw_value)) {
                        basic_offset = b43legacy_plcp_get_ratecode_cck(rate->hw_value);
                        basic_offset &= 0xF;
                } else {
                        basic_offset = b43legacy_plcp_get_ratecode_ofdm(rate->hw_value);
                        basic_offset &= 0xF;
                }

                /*
                 * Get the pointer that we need to point to
                 * from the direct map
                 */
                rateptr = b43legacy_shm_read16(dev, B43legacy_SHM_SHARED,
                                               direct + 2 * basic_offset);
                /* and write it to the basic map */
                b43legacy_shm_write16(dev, B43legacy_SHM_SHARED,
                                      basic + 2 * offset, rateptr);
        }
}

static void b43legacy_op_bss_info_changed(struct ieee80211_hw *hw,
                                    struct ieee80211_vif *vif,
                                    struct ieee80211_bss_conf *conf,
                                    u32 changed)
{
        struct b43legacy_wl *wl = hw_to_b43legacy_wl(hw);
        struct b43legacy_wldev *dev;
        unsigned long flags;

        mutex_lock(&wl->mutex);
        B43legacy_WARN_ON(wl->vif != vif);

        dev = wl->current_dev;

        /* Disable IRQs while reconfiguring the device.
         * This makes it possible to drop the spinlock throughout
         * the reconfiguration process. */
        spin_lock_irqsave(&wl->irq_lock, flags);
        if (b43legacy_status(dev) < B43legacy_STAT_STARTED) {
                spin_unlock_irqrestore(&wl->irq_lock, flags);
                goto out_unlock_mutex;
        }
        b43legacy_write32(dev, B43legacy_MMIO_GEN_IRQ_MASK, 0);

        if (changed & BSS_CHANGED_BSSID) {
                b43legacy_synchronize_irq(dev);

                if (conf->bssid)
                        memcpy(wl->bssid, conf->bssid, ETH_ALEN);
                else
                        eth_zero_addr(wl->bssid);
        }

        if (b43legacy_status(dev) >= B43legacy_STAT_INITIALIZED) {
                if (changed & BSS_CHANGED_BEACON &&
                    (b43legacy_is_mode(wl, NL80211_IFTYPE_AP) ||
                     b43legacy_is_mode(wl, NL80211_IFTYPE_ADHOC)))
                        b43legacy_update_templates(wl);

                if (changed & BSS_CHANGED_BSSID)
                        b43legacy_write_mac_bssid_templates(dev);
        }
        spin_unlock_irqrestore(&wl->irq_lock, flags);

        b43legacy_mac_suspend(dev);

        if (changed & BSS_CHANGED_BEACON_INT &&
            (b43legacy_is_mode(wl, NL80211_IFTYPE_AP) ||
             b43legacy_is_mode(wl, NL80211_IFTYPE_ADHOC)))
                b43legacy_set_beacon_int(dev, conf->beacon_int);

        if (changed & BSS_CHANGED_BASIC_RATES)
                b43legacy_update_basic_rates(dev, conf->basic_rates);

        if (changed & BSS_CHANGED_ERP_SLOT) {
                if (conf->use_short_slot)
                        b43legacy_short_slot_timing_enable(dev);
                else
                        b43legacy_short_slot_timing_disable(dev);
        }

        b43legacy_mac_enable(dev);

        spin_lock_irqsave(&wl->irq_lock, flags);
        b43legacy_write32(dev, B43legacy_MMIO_GEN_IRQ_MASK, dev->irq_mask);
        /* XXX: why? */
        spin_unlock_irqrestore(&wl->irq_lock, flags);
 out_unlock_mutex:
        mutex_unlock(&wl->mutex);
}

static void b43legacy_op_configure_filter(struct ieee80211_hw *hw,
                                          unsigned int changed,
                                          unsigned int *fflags,u64 multicast)
{
        struct b43legacy_wl *wl = hw_to_b43legacy_wl(hw);
        struct b43legacy_wldev *dev = wl->current_dev;
        unsigned long flags;

        if (!dev) {
                *fflags = 0;
                return;
        }

        spin_lock_irqsave(&wl->irq_lock, flags);
        *fflags &= FIF_ALLMULTI |
                  FIF_FCSFAIL |
                  FIF_PLCPFAIL |
                  FIF_CONTROL |
                  FIF_OTHER_BSS |
                  FIF_BCN_PRBRESP_PROMISC;

        changed &= FIF_ALLMULTI |
                   FIF_FCSFAIL |
                   FIF_PLCPFAIL |
                   FIF_CONTROL |
                   FIF_OTHER_BSS |
                   FIF_BCN_PRBRESP_PROMISC;

        wl->filter_flags = *fflags;

        if (changed && b43legacy_status(dev) >= B43legacy_STAT_INITIALIZED)
                b43legacy_adjust_opmode(dev);
        spin_unlock_irqrestore(&wl->irq_lock, flags);
}

/* Locking: wl->mutex */
static void b43legacy_wireless_core_stop(struct b43legacy_wldev *dev)
{
        struct b43legacy_wl *wl = dev->wl;
        unsigned long flags;
        int queue_num;

        if (b43legacy_status(dev) < B43legacy_STAT_STARTED)
                return;

        /* Disable and sync interrupts. We must do this before than
         * setting the status to INITIALIZED, as the interrupt handler
         * won't care about IRQs then. */
        spin_lock_irqsave(&wl->irq_lock, flags);
        b43legacy_write32(dev, B43legacy_MMIO_GEN_IRQ_MASK, 0);
        b43legacy_read32(dev, B43legacy_MMIO_GEN_IRQ_MASK); /* flush */
        spin_unlock_irqrestore(&wl->irq_lock, flags);
        b43legacy_synchronize_irq(dev);

        b43legacy_set_status(dev, B43legacy_STAT_INITIALIZED);

        mutex_unlock(&wl->mutex);
        /* Must unlock as it would otherwise deadlock. No races here.
         * Cancel the possibly running self-rearming periodic work. */
        cancel_delayed_work_sync(&dev->periodic_work);
        cancel_work_sync(&wl->tx_work);
        mutex_lock(&wl->mutex);

        /* Drain all TX queues. */
        for (queue_num = 0; queue_num < B43legacy_QOS_QUEUE_NUM; queue_num++) {
                while (skb_queue_len(&wl->tx_queue[queue_num]))
                        dev_kfree_skb(skb_dequeue(&wl->tx_queue[queue_num]));
        }

b43legacy_mac_suspend(dev);
        free_irq(dev->dev->irq, dev);
        b43legacydbg(wl, "Wireless interface stopped\n");
}

/* Locking: wl->mutex */
static int b43legacy_wireless_core_start(struct b43legacy_wldev *dev)
{
        int err;

        B43legacy_WARN_ON(b43legacy_status(dev) != B43legacy_STAT_INITIALIZED);

        drain_txstatus_queue(dev);
        err = request_irq(dev->dev->irq, b43legacy_interrupt_handler,
                          IRQF_SHARED, KBUILD_MODNAME, dev);
        if (err) {
                b43legacyerr(dev->wl, "Cannot request IRQ-%d\n",
                       dev->dev->irq);
                goto out;
        }
        /* We are ready to run. */
        ieee80211_wake_queues(dev->wl->hw);
        b43legacy_set_status(dev, B43legacy_STAT_STARTED);

        /* Start data flow (TX/RX) */
        b43legacy_mac_enable(dev);
        b43legacy_write32(dev, B43legacy_MMIO_GEN_IRQ_MASK, dev->irq_mask);

        /* Start maintenance work */
        b43legacy_periodic_tasks_setup(dev);

        b43legacydbg(dev->wl, "Wireless interface started\n");
out:
        return err;
}

/* Get PHY and RADIO versioning numbers */
static int b43legacy_phy_versioning(struct b43legacy_wldev *dev)
{
        struct b43legacy_phy *phy = &dev->phy;
        u32 tmp;
        u8 analog_type;
        u8 phy_type;
        u8 phy_rev;
        u16 radio_manuf;
        u16 radio_ver;
        u16 radio_rev;
        int unsupported = 0;

        /* Get PHY versioning */
        tmp = b43legacy_read16(dev, B43legacy_MMIO_PHY_VER);
        analog_type = (tmp & B43legacy_PHYVER_ANALOG)
                      >> B43legacy_PHYVER_ANALOG_SHIFT;
        phy_type = (tmp & B43legacy_PHYVER_TYPE) >> B43legacy_PHYVER_TYPE_SHIFT;
        phy_rev = (tmp & B43legacy_PHYVER_VERSION);