text: /*
   *
   *  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.
  
   *  This program is free software; you can redistribute it and/or modify
   *  it under the terms of the GNU General Public License as published by
   *  the Free Software Foundation; either version 2 of the License, or
   *  (at your option) any later version.
   *
   *  This program is distributed in the hope that it will be useful,
   *  but WITHOUT ANY WARRANTY; without even the implied warranty of
   *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   *  GNU General Public License for more details.
   *
   *  You should have received a copy of the GNU General Public License
   *  along with this program; see the file COPYING.  If not, write to
   *  the Free Software Foundation, Inc., 51 Franklin Steet, Fifth Floor,
   *  Boston, MA 02110-1301, USA.
   *
   */
  
  #include <linux/delay.h>
  #include <linux/init.h>
  #include <linux/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);
  	mmiowb();
  	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);
  			mmiowb();
  			b43legacy_write16(dev,
  					  B43legacy_MMIO_SHM_DATA_UNALIGNED,
  					  (value >> 16) & 0xffff);
  			mmiowb();
  			b43legacy_shm_control_word(dev, routing,
  						   (offset >> 2) + 1);
  			mmiowb();
  			b43legacy_write16(dev, B43legacy_MMIO_SHM_DATA,
  					  value & 0xffff);
  			return;
  		}
  		offset >>= 2;
  	}
  	b43legacy_shm_control_word(dev, routing, offset);
  	mmiowb();
  	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);
  			mmiowb();
  			b43legacy_write16(dev,
  					  B43legacy_MMIO_SHM_DATA_UNALIGNED,
  					  value);
  			return;
  		}
  		offset >>= 2;
  	}
  	b43legacy_shm_control_word(dev, routing, offset);
  	mmiowb();
  	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 (overflew).
  	 */
  	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);
  	mmiowb();
  }
  
  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);
  		mmiowb();
  		b43legacy_write32(dev, B43legacy_MMIO_REV3PLUS_TSF_HIGH,
  				    hi);
  		mmiowb();
  		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);
  		mmiowb();
  		b43legacy_write16(dev, B43legacy_MMIO_TSF_3, v3);
  		mmiowb();
  		b43legacy_write16(dev, B43legacy_MMIO_TSF_2, v2);
  		mmiowb();
  		b43legacy_write16(dev, B43legacy_MMIO_TSF_1, v1);
  		mmiowb();
  		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
   * http://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);
  		mmiowb();
  		spin_unlock_irq(&wl->irq_lock);
  	}
  	mutex_unlock(&wl->mutex);
  }
  
  /* Asynchronously update the packet templates in template RAM.
   * Locking: Requires wl->irq_lock to be locked. */
  static void 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 b43legacy_wldev *dev)
  {
  	u32 reason;
  	u32 dma_reason[ARRAY_SIZE(dev->dma_reason)];
  	u32 merged_dma_reason = 0;
  	int i;
  	unsigned long flags;
  
  	spin_lock_irqsave(&dev->wl->irq_lock, flags);
  
  	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");
  			mmiowb();
  			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);
  	mmiowb();
  	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:
  	mmiowb();
  	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 http://wireless.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
   * http://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);
  	}
  }
  
  /* http://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
   * http://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 *uninitialized_var(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);
  	mmiowb();
  	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];
  	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? */
  	mmiowb();
  	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);
  	switch (phy_type) {
  	case B43legacy_PHYTYPE_B:
  		if (phy_rev != 2 && phy_rev != 4
  		    && phy_rev != 6 && phy_rev != 7)
  			unsupported = 1;
  		break;
  	case B43legacy_PHYTYPE_G:
  		if (phy_rev > 8)
  			unsupported = 1;
  		break;
  	default:
  		unsupported = 1;
  	}
  	if (unsupported) {
  		b43legacyerr(dev->wl, "FOUND UNSUPPORTED PHY "
  		       "(Analog %u, Type %u, Revision %u)\n",
  		       analog_type, phy_type, phy_rev);
  		return -EOPNOTSUPP;
  	}
  	b43legacydbg(dev->wl, "Found PHY: Analog %u, Type %u, Revision %u\n",
  	       analog_type, phy_type, phy_rev);
  
  
  	/* Get RADIO versioning */
  	if (dev->dev->bus->chip_id == 0x4317) {
  		if (dev->dev->bus->chip_rev == 0)
  			tmp = 0x3205017F;
  		else if (dev->dev->bus->chip_rev == 1)
  			tmp = 0x4205017F;
  		else
  			tmp = 0x5205017F;
  	} else {
  		b43legacy_write16(dev, B43legacy_MMIO_RADIO_CONTROL,
  				  B43legacy_RADIOCTL_ID);
  		tmp = b43legacy_read16(dev, B43legacy_MMIO_RADIO_DATA_HIGH);
  		tmp <<= 16;
  		b43legacy_write16(dev, B43legacy_MMIO_RADIO_CONTROL,
  				  B43legacy_RADIOCTL_ID);
  		tmp |= b43legacy_read16(dev, B43legacy_MMIO_RADIO_DATA_LOW);
  	}
  	radio_manuf = (tmp & 0x00000FFF);
  	radio_ver = (tmp & 0x0FFFF000) >> 12;
  	radio_rev = (tmp & 0xF0000000) >> 28;
  	switch (phy_type) {
  	case B43legacy_PHYTYPE_B:
  		if ((radio_ver & 0xFFF0) != 0x2050)
  			unsupported = 1;
  		break;
  	case B43legacy_PHYTYPE_G:
  		if (radio_ver != 0x2050)
  			unsupported = 1;
  		break;
  	default:
  		B43legacy_BUG_ON(1);
  	}
  	if (unsupported) {
  		b43legacyerr(dev->wl, "FOUND UNSUPPORTED RADIO "
  		       "(Manuf 0x%X, Version 0x%X, Revision %u)\n",
  		       radio_manuf, radio_ver, radio_rev);
  		return -EOPNOTSUPP;
  	}
  	b43legacydbg(dev->wl, "Found Radio: Manuf 0x%X, Version 0x%X,"
  		     " Revision %u\n", radio_manuf, radio_ver, radio_rev);
  
  
  	phy->radio_manuf = radio_manuf;
  	phy->radio_ver = radio_ver;
  	phy->radio_rev = radio_rev;
  
  	phy->analog = analog_type;
  	phy->type = phy_type;
  	phy->rev = phy_rev;
  
  	return 0;
  }
  
  static void setup_struct_phy_for_init(struct b43legacy_wldev *dev,
  				      struct b43legacy_phy *phy)
  {
  	struct b43legacy_lopair *lo;
  	int i;
  
  	memset(phy->minlowsig, 0xFF, sizeof(phy->minlowsig));
  	memset(phy->minlowsigpos, 0, sizeof(phy->minlowsigpos));
  
  	/* Assume the radio is enabled. If it's not enabled, the state will
  	 * immediately get fixed on the first periodic work run. */
  	dev->radio_hw_enable = true;
  
  	phy->savedpctlreg = 0xFFFF;
  	phy->aci_enable = false;
  	phy->aci_wlan_automatic = false;
  	phy->aci_hw_rssi = false;
  
  	lo = phy->_lo_pairs;
  	if (lo)
  		memset(lo, 0, sizeof(struct b43legacy_lopair) *
  				     B43legacy_LO_COUNT);
  	phy->max_lb_gain = 0;
  	phy->trsw_rx_gain = 0;
  
  	/* Set default attenuation values. */
  	phy->bbatt = b43legacy_default_baseband_attenuation(dev);
  	phy->rfatt = b43legacy_default_radio_attenuation(dev);
  	phy->txctl1 = b43legacy_default_txctl1(dev);
  	phy->txpwr_offset = 0;
  
  	/* NRSSI */
  	phy->nrssislope = 0;
  	for (i = 0; i < ARRAY_SIZE(phy->nrssi); i++)
  		phy->nrssi[i] = -1000;
  	for (i = 0; i < ARRAY_SIZE(phy->nrssi_lt); i++)
  		phy->nrssi_lt[i] = i;
  
  	phy->lofcal = 0xFFFF;
  	phy->initval = 0xFFFF;
  
  	phy->interfmode = B43legacy_INTERFMODE_NONE;
  	phy->channel = 0xFF;
  }
  
  static void setup_struct_wldev_for_init(struct b43legacy_wldev *dev)
  {
  	/* Flags */
  	dev->dfq_valid = false;
  
  	/* Stats */
  	memset(&dev->stats, 0, sizeof(dev->stats));
  
  	setup_struct_phy_for_init(dev, &dev->phy);
  
  	/* IRQ related flags */
  	dev->irq_reason = 0;
  	memset(dev->dma_reason, 0, sizeof(dev->dma_reason));
  	dev->irq_mask = B43legacy_IRQ_MASKTEMPLATE;
  
  	dev->mac_suspended = 1;
  
  	/* Noise calculation context */
  	memset(&dev->noisecalc, 0, sizeof(dev->noisecalc));
  }
  
  static void b43legacy_set_synth_pu_delay(struct b43legacy_wldev *dev,
  					  bool idle) {
  	u16 pu_delay = 1050;
  
  	if (b43legacy_is_mode(dev->wl, NL80211_IFTYPE_ADHOC) || idle)
  		pu_delay = 500;
  	if ((dev->phy.radio_ver == 0x2050) && (dev->phy.radio_rev == 8))
  		pu_delay = max(pu_delay, (u16)2400);
  
  	b43legacy_shm_write16(dev, B43legacy_SHM_SHARED,
  			      B43legacy_SHM_SH_SPUWKUP, pu_delay);
  }
  
  /* Set the TSF CFP pre-TargetBeaconTransmissionTime. */
  static void b43legacy_set_pretbtt(struct b43legacy_wldev *dev)
  {
  	u16 pretbtt;
  
  	/* The time value is in microseconds. */
  	if (b43legacy_is_mode(dev->wl, NL80211_IFTYPE_ADHOC))
  		pretbtt = 2;
  	else
  		pretbtt = 250;
  	b43legacy_shm_write16(dev, B43legacy_SHM_SHARED,
  			      B43legacy_SHM_SH_PRETBTT, pretbtt);
  	b43legacy_write16(dev, B43legacy_MMIO_TSF_CFP_PRETBTT, pretbtt);
  }
  
  /* Shutdown a wireless core */
  /* Locking: wl->mutex */
  static void b43legacy_wireless_core_exit(struct b43legacy_wldev *dev)
  {
  	struct b43legacy_phy *phy = &dev->phy;
  	u32 macctl;
  
  	B43legacy_WARN_ON(b43legacy_status(dev) > B43legacy_STAT_INITIALIZED);
  	if (b43legacy_status(dev) != B43legacy_STAT_INITIALIZED)
  		return;
  	b43legacy_set_status(dev, B43legacy_STAT_UNINIT);
  
  	/* Stop the microcode PSM. */
  	macctl = b43legacy_read32(dev, B43legacy_MMIO_MACCTL);
  	macctl &= ~B43legacy_MACCTL_PSM_RUN;
  	macctl |= B43legacy_MACCTL_PSM_JMP0;
  	b43legacy_write32(dev, B43legacy_MMIO_MACCTL, macctl);
  
  	b43legacy_leds_exit(dev);
  	b43legacy_rng_exit(dev->wl);
  	b43legacy_pio_free(dev);
  	b43legacy_dma_free(dev);
  	b43legacy_chip_exit(dev);
  	b43legacy_radio_turn_off(dev, 1);
  	b43legacy_switch_analog(dev, 0);
  	if (phy->dyn_tssi_tbl)
  		kfree(phy->tssi2dbm);
  	kfree(phy->lo_control);
  	phy->lo_control = NULL;
  	if (dev->wl->current_beacon) {
  		dev_kfree_skb_any(dev->wl->current_beacon);
  		dev->wl->current_beacon = NULL;
  	}
  
  	ssb_device_disable(dev->dev, 0);
  	ssb_bus_may_powerdown(dev->dev->bus);
  }
  
  static void prepare_phy_data_for_init(struct b43legacy_wldev *dev)
  {
  	struct b43legacy_phy *phy = &dev->phy;
  	int i;
  
  	/* Set default attenuation values. */
  	phy->bbatt = b43legacy_default_baseband_attenuation(dev);
  	phy->rfatt = b43legacy_default_radio_attenuation(dev);
  	phy->txctl1 = b43legacy_default_txctl1(dev);
  	phy->txctl2 = 0xFFFF;
  	phy->txpwr_offset = 0;
  
  	/* NRSSI */
  	phy->nrssislope = 0;
  	for (i = 0; i < ARRAY_SIZE(phy->nrssi); i++)
  		phy->nrssi[i] = -1000;
  	for (i = 0; i < ARRAY_SIZE(phy->nrssi_lt); i++)
  		phy->nrssi_lt[i] = i;
  
  	phy->lofcal = 0xFFFF;
  	phy->initval = 0xFFFF;
  
  	phy->aci_enable = false;
  	phy->aci_wlan_automatic = false;
  	phy->aci_hw_rssi = false;
  
  	phy->antenna_diversity = 0xFFFF;
  	memset(phy->minlowsig, 0xFF, sizeof(phy->minlowsig));
  	memset(phy->minlowsigpos, 0, sizeof(phy->minlowsigpos));
  
  	/* Flags */
  	phy->calibrated = 0;
  
  	if (phy->_lo_pairs)
  		memset(phy->_lo_pairs, 0,
  		       sizeof(struct b43legacy_lopair) * B43legacy_LO_COUNT);
  	memset(phy->loopback_gain, 0, sizeof(phy->loopback_gain));
  }
  
  /* Initialize a wireless core */
  static int b43legacy_wireless_core_init(struct b43legacy_wldev *dev)
  {
  	struct b43legacy_wl *wl = dev->wl;
  	struct ssb_bus *bus = dev->dev->bus;
  	struct b43legacy_phy *phy = &dev->phy;
  	struct ssb_sprom *sprom = &dev->dev->bus->sprom;
  	int err;
  	u32 hf;
  	u32 tmp;
  
  	B43legacy_WARN_ON(b43legacy_status(dev) != B43legacy_STAT_UNINIT);
  
  	err = ssb_bus_powerup(bus, 0);
  	if (err)
  		goto out;
  	if (!ssb_device_is_enabled(dev->dev)) {
  		tmp = phy->gmode ? B43legacy_TMSLOW_GMODE : 0;
  		b43legacy_wireless_core_reset(dev, tmp);
  	}
  
  	if ((phy->type == B43legacy_PHYTYPE_B) ||
  	    (phy->type == B43legacy_PHYTYPE_G)) {
  		phy->_lo_pairs = kzalloc(sizeof(struct b43legacy_lopair)
  					 * B43legacy_LO_COUNT,
  					 GFP_KERNEL);
  		if (!phy->_lo_pairs)
  			return -ENOMEM;
  	}
  	setup_struct_wldev_for_init(dev);
  
  	err = b43legacy_phy_init_tssi2dbm_table(dev);
  	if (err)
  		goto err_kfree_lo_control;
  
  	/* Enable IRQ routing to this device. */
  	ssb_pcicore_dev_irqvecs_enable(&bus->pcicore, dev->dev);
  
  	prepare_phy_data_for_init(dev);
  	b43legacy_phy_calibrate(dev);
  	err = b43legacy_chip_init(dev);
  	if (err)
  		goto err_kfree_tssitbl;
  	b43legacy_shm_write16(dev, B43legacy_SHM_SHARED,
  			      B43legacy_SHM_SH_WLCOREREV,
  			      dev->dev->id.revision);
  	hf = b43legacy_hf_read(dev);
  	if (phy->type == B43legacy_PHYTYPE_G) {
  		hf |= B43legacy_HF_SYMW;
  		if (phy->rev == 1)
  			hf |= B43legacy_HF_GDCW;
  		if (sprom->boardflags_lo & B43legacy_BFL_PACTRL)
  			hf |= B43legacy_HF_OFDMPABOOST;
  	} else if (phy->type == B43legacy_PHYTYPE_B) {
  		hf |= B43legacy_HF_SYMW;
  		if (phy->rev >= 2 && phy->radio_ver == 0x2050)
  			hf &= ~B43legacy_HF_GDCW;
  	}
  	b43legacy_hf_write(dev, hf);
  
  	b43legacy_set_retry_limits(dev,
  				   B43legacy_DEFAULT_SHORT_RETRY_LIMIT,
  				   B43legacy_DEFAULT_LONG_RETRY_LIMIT);
  
  	b43legacy_shm_write16(dev, B43legacy_SHM_SHARED,
  			      0x0044, 3);
  	b43legacy_shm_write16(dev, B43legacy_SHM_SHARED,
  			      0x0046, 2);
  
  	/* Disable sending probe responses from firmware.
  	 * Setting the MaxTime to one usec will always trigger
  	 * a timeout, so we never send any probe resp.
  	 * A timeout of zero is infinite. */
  	b43legacy_shm_write16(dev, B43legacy_SHM_SHARED,
  			      B43legacy_SHM_SH_PRMAXTIME, 1);
  
  	b43legacy_rate_memory_init(dev);
  
  	/* Minimum Contention Window */
  	if (phy->type == B43legacy_PHYTYPE_B)
  		b43legacy_shm_write16(dev, B43legacy_SHM_WIRELESS,
  				      0x0003, 31);
  	else
  		b43legacy_shm_write16(dev, B43legacy_SHM_WIRELESS,
  				      0x0003, 15);
  	/* Maximum Contention Window */
  	b43legacy_shm_write16(dev, B43legacy_SHM_WIRELESS,
  			      0x0004, 1023);
  
  	do {
  		if (b43legacy_using_pio(dev))
  			err = b43legacy_pio_init(dev);
  		else {
  			err = b43legacy_dma_init(dev);
  			if (!err)
  				b43legacy_qos_init(dev);
  		}
  	} while (err == -EAGAIN);
  	if (err)
  		goto err_chip_exit;
  
  	b43legacy_set_synth_pu_delay(dev, 1);
  
  	ssb_bus_powerup(bus, 1); /* Enable dynamic PCTL */
  	b43legacy_upload_card_macaddress(dev);
  	b43legacy_security_init(dev);
  	b43legacy_rng_init(wl);
  
  	ieee80211_wake_queues(dev->wl->hw);
  	b43legacy_set_status(dev, B43legacy_STAT_INITIALIZED);
  
  	b43legacy_leds_init(dev);
  out:
  	return err;
  
  err_chip_exit:
  	b43legacy_chip_exit(dev);
  err_kfree_tssitbl:
  	if (phy->dyn_tssi_tbl)
  		kfree(phy->tssi2dbm);
  err_kfree_lo_control:
  	kfree(phy->lo_control);
  	phy->lo_control = NULL;
  	ssb_bus_may_powerdown(bus);
  	B43legacy_WARN_ON(b43legacy_status(dev) != B43legacy_STAT_UNINIT);
  	return err;
  }
  
  static int b43legacy_op_add_interface(struct ieee80211_hw *hw,
  				      struct ieee80211_vif *vif)
  {
  	struct b43legacy_wl *wl = hw_to_b43legacy_wl(hw);
  	struct b43legacy_wldev *dev;
  	unsigned long flags;
  	int err = -EOPNOTSUPP;
  
  	/* TODO: allow WDS/AP devices to coexist */
  
  	if (vif->type != NL80211_IFTYPE_AP &&
  	    vif->type != NL80211_IFTYPE_STATION &&
  	    vif->type != NL80211_IFTYPE_WDS &&
  	    vif->type != NL80211_IFTYPE_ADHOC)
  		return -EOPNOTSUPP;
  
  	mutex_lock(&wl->mutex);
  	if (wl->operating)
  		goto out_mutex_unlock;
  
  	b43legacydbg(wl, "Adding Interface type %d\n", vif->type);
  
  	dev = wl->current_dev;
  	wl->operating = true;
  	wl->vif = vif;
  	wl->if_type = vif->type;
  	memcpy(wl->mac_addr, vif->addr, ETH_ALEN);
  
  	spin_lock_irqsave(&wl->irq_lock, flags);
  	b43legacy_adjust_opmode(dev);
  	b43legacy_set_pretbtt(dev);
  	b43legacy_set_synth_pu_delay(dev, 0);
  	b43legacy_upload_card_macaddress(dev);
  	spin_unlock_irqrestore(&wl->irq_lock, flags);
  
  	err = 0;
   out_mutex_unlock:
  	mutex_unlock(&wl->mutex);
  
  	return err;
  }
  
  static void b43legacy_op_remove_interface(struct ieee80211_hw *hw,
  					  struct ieee80211_vif *vif)
  {
  	struct b43legacy_wl *wl = hw_to_b43legacy_wl(hw);
  	struct b43legacy_wldev *dev = wl->current_dev;
  	unsigned long flags;
  
  	b43legacydbg(wl, "Removing Interface type %d\n", vif->type);
  
  	mutex_lock(&wl->mutex);
  
  	B43legacy_WARN_ON(!wl->operating);
  	B43legacy_WARN_ON(wl->vif != vif);
  	wl->vif = NULL;
  
  	wl->operating = false;
  
  	spin_lock_irqsave(&wl->irq_lock, flags);
  	b43legacy_adjust_opmode(dev);
  	eth_zero_addr(wl->mac_addr);
  	b43legacy_upload_card_macaddress(dev);
  	spin_unlock_irqrestore(&wl->irq_lock, flags);
  
  	mutex_unlock(&wl->mutex);
  }
  
  static int b43legacy_op_start(struct ieee80211_hw *hw)
  {
  	struct b43legacy_wl *wl = hw_to_b43legacy_wl(hw);
  	struct b43legacy_wldev *dev = wl->current_dev;
  	int did_init = 0;
  	int err = 0;
  
  	/* Kill all old instance specific information to make sure
  	 * the card won't use it in the short timeframe between start
  	 * and mac80211 reconfiguring it. */
  	eth_zero_addr(wl->bssid);
  	eth_zero_addr(wl->mac_addr);
  	wl->filter_flags = 0;
  	wl->beacon0_uploaded = false;
  	wl->beacon1_uploaded = false;
  	wl->beacon_templates_virgin = true;
  	wl->radio_enabled = true;
  
  	mutex_lock(&wl->mutex);
  
  	if (b43legacy_status(dev) < B43legacy_STAT_INITIALIZED) {
  		err = b43legacy_wireless_core_init(dev);
  		if (err)
  			goto out_mutex_unlock;
  		did_init = 1;
  	}
  
  	if (b43legacy_status(dev) < B43legacy_STAT_STARTED) {
  		err = b43legacy_wireless_core_start(dev);
  		if (err) {
  			if (did_init)
  				b43legacy_wireless_core_exit(dev);
  			goto out_mutex_unlock;
  		}
  	}
  
  	wiphy_rfkill_start_polling(hw->wiphy);
  
  out_mutex_unlock:
  	mutex_unlock(&wl->mutex);
  
  	return err;
  }
  
  static void b43legacy_op_stop(struct ieee80211_hw *hw)
  {
  	struct b43legacy_wl *wl = hw_to_b43legacy_wl(hw);
  	struct b43legacy_wldev *dev = wl->current_dev;
  
  	cancel_work_sync(&(wl->beacon_update_trigger));
  
  	mutex_lock(&wl->mutex);
  	if (b43legacy_status(dev) >= B43legacy_STAT_STARTED)
  		b43legacy_wireless_core_stop(dev);
  	b43legacy_wireless_core_exit(dev);
  	wl->radio_enabled = false;
  	mutex_unlock(&wl->mutex);
  }
  
  static int b43legacy_op_beacon_set_tim(struct ieee80211_hw *hw,
  				       struct ieee80211_sta *sta, bool set)
  {
  	struct b43legacy_wl *wl = hw_to_b43legacy_wl(hw);
  	unsigned long flags;
  
  	spin_lock_irqsave(&wl->irq_lock, flags);
  	b43legacy_update_templates(wl);
  	spin_unlock_irqrestore(&wl->irq_lock, flags);
  
  	return 0;
  }
  
  static int b43legacy_op_get_survey(struct ieee80211_hw *hw, int idx,
  				   struct survey_info *survey)
  {
  	struct b43legacy_wl *wl = hw_to_b43legacy_wl(hw);
  	struct b43legacy_wldev *dev = wl->current_dev;
  	struct ieee80211_conf *conf = &hw->conf;
  
  	if (idx != 0)
  		return -ENOENT;
  
  	survey->channel = conf->chandef.chan;
  	survey->filled = SURVEY_INFO_NOISE_DBM;
  	survey->noise = dev->stats.link_noise;
  
  	return 0;
  }
  
  static const struct ieee80211_ops b43legacy_hw_ops = {
  	.tx			= b43legacy_op_tx,
  	.conf_tx		= b43legacy_op_conf_tx,
  	.add_interface		= b43legacy_op_add_interface,
  	.remove_interface	= b43legacy_op_remove_interface,
  	.config			= b43legacy_op_dev_config,
  	.bss_info_changed	= b43legacy_op_bss_info_changed,
  	.configure_filter	= b43legacy_op_configure_filter,
  	.get_stats		= b43legacy_op_get_stats,
  	.start			= b43legacy_op_start,
  	.stop			= b43legacy_op_stop,
  	.set_tim		= b43legacy_op_beacon_set_tim,
  	.get_survey		= b43legacy_op_get_survey,
  	.rfkill_poll		= b43legacy_rfkill_poll,
  };
  
  /* Hard-reset the chip. Do not call this directly.
   * Use b43legacy_controller_restart()
   */
  static void b43legacy_chip_reset(struct work_struct *work)
  {
  	struct b43legacy_wldev *dev =
  		container_of(work, struct b43legacy_wldev, restart_work);
  	struct b43legacy_wl *wl = dev->wl;
  	int err = 0;
  	int prev_status;
  
  	mutex_lock(&wl->mutex);
  
  	prev_status = b43legacy_status(dev);
  	/* Bring the device down... */
  	if (prev_status >= B43legacy_STAT_STARTED)
  		b43legacy_wireless_core_stop(dev);
  	if (prev_status >= B43legacy_STAT_INITIALIZED)
  		b43legacy_wireless_core_exit(dev);
  
  	/* ...and up again. */
  	if (prev_status >= B43legacy_STAT_INITIALIZED) {
  		err = b43legacy_wireless_core_init(dev);
  		if (err)
  			goto out;
  	}
  	if (prev_status >= B43legacy_STAT_STARTED) {
  		err = b43legacy_wireless_core_start(dev);
  		if (err) {
  			b43legacy_wireless_core_exit(dev);
  			goto out;
  		}
  	}
  out:
  	if (err)
  		wl->current_dev = NULL; /* Failed to init the dev. */
  	mutex_unlock(&wl->mutex);
  	if (err)
  		b43legacyerr(wl, "Controller restart FAILED\n");
  	else
  		b43legacyinfo(wl, "Controller restarted\n");
  }
  
  static int b43legacy_setup_modes(struct b43legacy_wldev *dev,
  				 int have_bphy,
  				 int have_gphy)
  {
  	struct ieee80211_hw *hw = dev->wl->hw;
  	struct b43legacy_phy *phy = &dev->phy;
  
  	phy->possible_phymodes = 0;
  	if (have_bphy) {
  		hw->wiphy->bands[NL80211_BAND_2GHZ] =
  			&b43legacy_band_2GHz_BPHY;
  		phy->possible_phymodes |= B43legacy_PHYMODE_B;
  	}
  
  	if (have_gphy) {
  		hw->wiphy->bands[NL80211_BAND_2GHZ] =
  			&b43legacy_band_2GHz_GPHY;
  		phy->possible_phymodes |= B43legacy_PHYMODE_G;
  	}
  
  	return 0;
  }
  
  static void b43legacy_wireless_core_detach(struct b43legacy_wldev *dev)
  {
  	/* We release firmware that late to not be required to re-request
  	 * is all the time when we reinit the core. */
  	b43legacy_release_firmware(dev);
  }
  
  static int b43legacy_wireless_core_attach(struct b43legacy_wldev *dev)
  {
  	struct b43legacy_wl *wl = dev->wl;
  	struct ssb_bus *bus = dev->dev->bus;
  	struct pci_dev *pdev = (bus->bustype == SSB_BUSTYPE_PCI) ? bus->host_pci : NULL;
  	int err;
  	int have_bphy = 0;
  	int have_gphy = 0;
  	u32 tmp;
  
  	/* Do NOT do any device initialization here.
  	 * Do it in wireless_core_init() instead.
  	 * This function is for gathering basic information about the HW, only.
  	 * Also some structs may be set up here. But most likely you want to
  	 * have that in core_init(), too.
  	 */
  
  	err = ssb_bus_powerup(bus, 0);
  	if (err) {
  		b43legacyerr(wl, "Bus powerup failed\n");
  		goto out;
  	}
  	/* Get the PHY type. */
  	if (dev->dev->id.revision >= 5) {
  		u32 tmshigh;
  
  		tmshigh = ssb_read32(dev->dev, SSB_TMSHIGH);
  		have_gphy = !!(tmshigh & B43legacy_TMSHIGH_GPHY);
  		if (!have_gphy)
  			have_bphy = 1;
  	} else if (dev->dev->id.revision == 4)
  		have_gphy = 1;
  	else
  		have_bphy = 1;
  
  	dev->phy.gmode = (have_gphy || have_bphy);
  	dev->phy.radio_on = true;
  	tmp = dev->phy.gmode ? B43legacy_TMSLOW_GMODE : 0;
  	b43legacy_wireless_core_reset(dev, tmp);
  
  	err = b43legacy_phy_versioning(dev);
  	if (err)
  		goto err_powerdown;
  	/* Check if this device supports multiband. */
  	if (!pdev ||
  	    (pdev->device != 0x4312 &&
  	     pdev->device != 0x4319 &&
  	     pdev->device != 0x4324)) {
  		/* No multiband support. */
  		have_bphy = 0;
  		have_gphy = 0;
  		switch (dev->phy.type) {
  		case B43legacy_PHYTYPE_B:
  			have_bphy = 1;
  			break;
  		case B43legacy_PHYTYPE_G:
  			have_gphy = 1;
  			break;
  		default:
  			B43legacy_BUG_ON(1);
  		}
  	}
  	dev->phy.gmode = (have_gphy || have_bphy);
  	tmp = dev->phy.gmode ? B43legacy_TMSLOW_GMODE : 0;
  	b43legacy_wireless_core_reset(dev, tmp);
  
  	err = b43legacy_validate_chipaccess(dev);
  	if (err)
  		goto err_powerdown;
  	err = b43legacy_setup_modes(dev, have_bphy, have_gphy);
  	if (err)
  		goto err_powerdown;
  
  	/* Now set some default "current_dev" */
  	if (!wl->current_dev)
  		wl->current_dev = dev;
  	INIT_WORK(&dev->restart_work, b43legacy_chip_reset);
  
  	b43legacy_radio_turn_off(dev, 1);
  	b43legacy_switch_analog(dev, 0);
  	ssb_device_disable(dev->dev, 0);
  	ssb_bus_may_powerdown(bus);
  
  out:
  	return err;
  
  err_powerdown:
  	ssb_bus_may_powerdown(bus);
  	return err;
  }
  
  static void b43legacy_one_core_detach(struct ssb_device *dev)
  {
  	struct b43legacy_wldev *wldev;
  	struct b43legacy_wl *wl;
  
  	/* Do not cancel ieee80211-workqueue based work here.
  	 * See comment in b43legacy_remove(). */
  
  	wldev = ssb_get_drvdata(dev);
  	wl = wldev->wl;
  	b43legacy_debugfs_remove_device(wldev);
  	b43legacy_wireless_core_detach(wldev);
  	list_del(&wldev->list);
  	wl->nr_devs--;
  	ssb_set_drvdata(dev, NULL);
  	kfree(wldev);
  }
  
  static int b43legacy_one_core_attach(struct ssb_device *dev,
  				     struct b43legacy_wl *wl)
  {
  	struct b43legacy_wldev *wldev;
  	int err = -ENOMEM;
  
  	wldev = kzalloc(sizeof(*wldev), GFP_KERNEL);
  	if (!wldev)
  		goto out;
  
  	wldev->dev = dev;
  	wldev->wl = wl;
  	b43legacy_set_status(wldev, B43legacy_STAT_UNINIT);
  	wldev->bad_frames_preempt = modparam_bad_frames_preempt;
  	tasklet_init(&wldev->isr_tasklet,
  		     (void (*)(unsigned long))b43legacy_interrupt_tasklet,
  		     (unsigned long)wldev);
  	if (modparam_pio)
  		wldev->__using_pio = true;
  	INIT_LIST_HEAD(&wldev->list);
  
  	err = b43legacy_wireless_core_attach(wldev);
  	if (err)
  		goto err_kfree_wldev;
  
  	list_add(&wldev->list, &wl->devlist);
  	wl->nr_devs++;
  	ssb_set_drvdata(dev, wldev);
  	b43legacy_debugfs_add_device(wldev);
  out:
  	return err;
  
  err_kfree_wldev:
  	kfree(wldev);
  	return err;
  }
  
  static void b43legacy_sprom_fixup(struct ssb_bus *bus)
  {
  	/* boardflags workarounds */
  	if (bus->boardinfo.vendor == PCI_VENDOR_ID_APPLE &&
  	    bus->boardinfo.type == 0x4E &&
  	    bus->sprom.board_rev > 0x40)
  		bus->sprom.boardflags_lo |= B43legacy_BFL_PACTRL;
  }
  
  static void b43legacy_wireless_exit(struct ssb_device *dev,
  				  struct b43legacy_wl *wl)
  {
  	struct ieee80211_hw *hw = wl->hw;
  
  	ssb_set_devtypedata(dev, NULL);
  	ieee80211_free_hw(hw);
  }
  
  static int b43legacy_wireless_init(struct ssb_device *dev)
  {
  	struct ssb_sprom *sprom = &dev->bus->sprom;
  	struct ieee80211_hw *hw;
  	struct b43legacy_wl *wl;
  	int err = -ENOMEM;
  	int queue_num;
  
  	b43legacy_sprom_fixup(dev->bus);
  
  	hw = ieee80211_alloc_hw(sizeof(*wl), &b43legacy_hw_ops);
  	if (!hw) {
  		b43legacyerr(NULL, "Could not allocate ieee80211 device\n");
  		goto out;
  	}
  
  	/* fill hw info */
  	ieee80211_hw_set(hw, RX_INCLUDES_FCS);
  	ieee80211_hw_set(hw, SIGNAL_DBM);
  
  	hw->wiphy->interface_modes =
  		BIT(NL80211_IFTYPE_AP) |
  		BIT(NL80211_IFTYPE_STATION) |
  #ifdef CONFIG_WIRELESS_WDS
  		BIT(NL80211_IFTYPE_WDS) |
  #endif
  		BIT(NL80211_IFTYPE_ADHOC);
  	hw->queues = 1; /* FIXME: hardware has more queues */
  	hw->max_rates = 2;
  	SET_IEEE80211_DEV(hw, dev->dev);
  	if (is_valid_ether_addr(sprom->et1mac))
  		SET_IEEE80211_PERM_ADDR(hw, sprom->et1mac);
  	else
  		SET_IEEE80211_PERM_ADDR(hw, sprom->il0mac);
  
  	/* Get and initialize struct b43legacy_wl */
  	wl = hw_to_b43legacy_wl(hw);
  	memset(wl, 0, sizeof(*wl));
  	wl->hw = hw;
  	spin_lock_init(&wl->irq_lock);
  	spin_lock_init(&wl->leds_lock);
  	mutex_init(&wl->mutex);
  	INIT_LIST_HEAD(&wl->devlist);
  	INIT_WORK(&wl->beacon_update_trigger, b43legacy_beacon_update_trigger_work);
  	INIT_WORK(&wl->tx_work, b43legacy_tx_work);
  
  	/* Initialize queues and flags. */
  	for (queue_num = 0; queue_num < B43legacy_QOS_QUEUE_NUM; queue_num++) {
  		skb_queue_head_init(&wl->tx_queue[queue_num]);
  		wl->tx_queue_stopped[queue_num] = 0;
  	}
  
  	ssb_set_devtypedata(dev, wl);
  	b43legacyinfo(wl, "Broadcom %04X WLAN found (core revision %u)\n",
  		      dev->bus->chip_id, dev->id.revision);
  	err = 0;
  out:
  	return err;
  }
  
  static int b43legacy_probe(struct ssb_device *dev,
  			 const struct ssb_device_id *id)
  {
  	struct b43legacy_wl *wl;
  	int err;
  	int first = 0;
  
  	wl = ssb_get_devtypedata(dev);
  	if (!wl) {
  		/* Probing the first core - setup common struct b43legacy_wl */
  		first = 1;
  		err = b43legacy_wireless_init(dev);
  		if (err)
  			goto out;
  		wl = ssb_get_devtypedata(dev);
  		B43legacy_WARN_ON(!wl);
  	}
  	err = b43legacy_one_core_attach(dev, wl);
  	if (err)
  		goto err_wireless_exit;
  
  	/* setup and start work to load firmware */
  	INIT_WORK(&wl->firmware_load, b43legacy_request_firmware);
  	schedule_work(&wl->firmware_load);
  
  out:
  	return err;
  
  err_wireless_exit:
  	if (first)
  		b43legacy_wireless_exit(dev, wl);
  	return err;
  }
  
  static void b43legacy_remove(struct ssb_device *dev)
  {
  	struct b43legacy_wl *wl = ssb_get_devtypedata(dev);
  	struct b43legacy_wldev *wldev = ssb_get_drvdata(dev);
  
  	/* We must cancel any work here before unregistering from ieee80211,
  	 * as the ieee80211 unreg will destroy the workqueue. */
  	cancel_work_sync(&wldev->restart_work);
  	cancel_work_sync(&wl->firmware_load);
  	complete(&wldev->fw_load_complete);
  
  	B43legacy_WARN_ON(!wl);
  	if (!wldev->fw.ucode)
  		return;			/* NULL if fw never loaded */
  	if (wl->current_dev == wldev)
  		ieee80211_unregister_hw(wl->hw);
  
  	b43legacy_one_core_detach(dev);
  
  	if (list_empty(&wl->devlist))
  		/* Last core on the chip unregistered.
  		 * We can destroy common struct b43legacy_wl.
  		 */
  		b43legacy_wireless_exit(dev, wl);
  }
  
  /* Perform a hardware reset. This can be called from any context. */
  void b43legacy_controller_restart(struct b43legacy_wldev *dev,
  				  const char *reason)
  {
  	/* Must avoid requeueing, if we are in shutdown. */
  	if (b43legacy_status(dev) < B43legacy_STAT_INITIALIZED)
  		return;
  	b43legacyinfo(dev->wl, "Controller RESET (%s) ...\n", reason);
  	ieee80211_queue_work(dev->wl->hw, &dev->restart_work);
  }
  
  #ifdef CONFIG_PM
  
  static int b43legacy_suspend(struct ssb_device *dev, pm_message_t state)
  {
  	struct b43legacy_wldev *wldev = ssb_get_drvdata(dev);
  	struct b43legacy_wl *wl = wldev->wl;
  
  	b43legacydbg(wl, "Suspending...\n");
  
  	mutex_lock(&wl->mutex);
  	wldev->suspend_init_status = b43legacy_status(wldev);
  	if (wldev->suspend_init_status >= B43legacy_STAT_STARTED)
  		b43legacy_wireless_core_stop(wldev);
  	if (wldev->suspend_init_status >= B43legacy_STAT_INITIALIZED)
  		b43legacy_wireless_core_exit(wldev);
  	mutex_unlock(&wl->mutex);
  
  	b43legacydbg(wl, "Device suspended.\n");
  
  	return 0;
  }
  
  static int b43legacy_resume(struct ssb_device *dev)
  {
  	struct b43legacy_wldev *wldev = ssb_get_drvdata(dev);
  	struct b43legacy_wl *wl = wldev->wl;
  	int err = 0;
  
  	b43legacydbg(wl, "Resuming...\n");
  
  	mutex_lock(&wl->mutex);
  	if (wldev->suspend_init_status >= B43legacy_STAT_INITIALIZED) {
  		err = b43legacy_wireless_core_init(wldev);
  		if (err) {
  			b43legacyerr(wl, "Resume failed at core init\n");
  			goto out;
  		}
  	}
  	if (wldev->suspend_init_status >= B43legacy_STAT_STARTED) {
  		err = b43legacy_wireless_core_start(wldev);
  		if (err) {
  			b43legacy_wireless_core_exit(wldev);
  			b43legacyerr(wl, "Resume failed at core start\n");
  			goto out;
  		}
  	}
  
  	b43legacydbg(wl, "Device resumed.\n");
  out:
  	mutex_unlock(&wl->mutex);
  	return err;
  }
  
  #else	/* CONFIG_PM */
  # define b43legacy_suspend	NULL
  # define b43legacy_resume		NULL
  #endif	/* CONFIG_PM */
  
  static struct ssb_driver b43legacy_ssb_driver = {
  	.name		= KBUILD_MODNAME,
  	.id_table	= b43legacy_ssb_tbl,
  	.probe		= b43legacy_probe,
  	.remove		= b43legacy_remove,
  	.suspend	= b43legacy_suspend,
  	.resume		= b43legacy_resume,
  };
  
  static void b43legacy_print_driverinfo(void)
  {
  	const char *feat_pci = "", *feat_leds = "",
  		   *feat_pio = "", *feat_dma = "";
  
  #ifdef CONFIG_B43LEGACY_PCI_AUTOSELECT
  	feat_pci = "P";
  #endif
  #ifdef CONFIG_B43LEGACY_LEDS
  	feat_leds = "L";
  #endif
  #ifdef CONFIG_B43LEGACY_PIO
  	feat_pio = "I";
  #endif
  #ifdef CONFIG_B43LEGACY_DMA
  	feat_dma = "D";
  #endif
  	printk(KERN_INFO "Broadcom 43xx-legacy driver loaded "
  	       "[ Features: %s%s%s%s ]\n",
  	       feat_pci, feat_leds, feat_pio, feat_dma);
  }
  
  static int __init b43legacy_init(void)
  {
  	int err;
  
  	b43legacy_debugfs_init();
  
  	err = ssb_driver_register(&b43legacy_ssb_driver);
  	if (err)
  		goto err_dfs_exit;
  
  	b43legacy_print_driverinfo();
  
  	return err;
  
  err_dfs_exit:
  	b43legacy_debugfs_exit();
  	return err;
  }
  
  static void __exit b43legacy_exit(void)
  {
  	ssb_driver_unregister(&b43legacy_ssb_driver);
  	b43legacy_debugfs_exit();
  }
  
  module_init(b43legacy_init)
  module_exit(b43legacy_exit)
  