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mwl8k.c

/*
 * drivers/net/wireless/mwl8k.c driver for Marvell TOPDOG 802.11 Wireless cards
 *
 * Copyright (C) 2008 Marvell Semiconductor Inc.
 *
 * This file is licensed under the terms of the GNU General Public
 * License version 2.  This program is licensed "as is" without any
 * warranty of any kind, whether express or implied.
 */

#include <linux/init.h>
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/spinlock.h>
#include <linux/list.h>
#include <linux/pci.h>
#include <linux/delay.h>
#include <linux/completion.h>
#include <linux/etherdevice.h>
#include <net/mac80211.h>
#include <linux/moduleparam.h>
#include <linux/firmware.h>
#include <linux/workqueue.h>

#define MWL8K_DESC      "Marvell TOPDOG(R) 802.11 Wireless Network Driver"
#define MWL8K_NAME      KBUILD_MODNAME
#define MWL8K_VERSION   "0.9.1"

MODULE_DESCRIPTION(MWL8K_DESC);
MODULE_VERSION(MWL8K_VERSION);
MODULE_AUTHOR("Lennert Buytenhek <buytenh@marvell.com>");
MODULE_LICENSE("GPL");

static DEFINE_PCI_DEVICE_TABLE(mwl8k_table) = {
      { PCI_VDEVICE(MARVELL, 0x2a2b), .driver_data = 8687, },
      { PCI_VDEVICE(MARVELL, 0x2a30), .driver_data = 8687, },
      { }
};
MODULE_DEVICE_TABLE(pci, mwl8k_table);

#define IEEE80211_ADDR_LEN                ETH_ALEN

/* Register definitions */
#define MWL8K_HIU_GEN_PTR                 0x00000c10
#define  MWL8K_MODE_STA                   0x0000005a
#define  MWL8K_MODE_AP                    0x000000a5
#define MWL8K_HIU_INT_CODE                0x00000c14
#define  MWL8K_FWSTA_READY                0xf0f1f2f4
#define  MWL8K_FWAP_READY                 0xf1f2f4a5
#define  MWL8K_INT_CODE_CMD_FINISHED            0x00000005
#define MWL8K_HIU_SCRATCH                 0x00000c40

/* Host->device communications */
#define MWL8K_HIU_H2A_INTERRUPT_EVENTS          0x00000c18
#define MWL8K_HIU_H2A_INTERRUPT_STATUS          0x00000c1c
#define MWL8K_HIU_H2A_INTERRUPT_MASK            0x00000c20
#define MWL8K_HIU_H2A_INTERRUPT_CLEAR_SEL 0x00000c24
#define MWL8K_HIU_H2A_INTERRUPT_STATUS_MASK     0x00000c28
#define  MWL8K_H2A_INT_DUMMY              (1 << 20)
#define  MWL8K_H2A_INT_RESET              (1 << 15)
#define  MWL8K_H2A_INT_PS                 (1 << 2)
#define  MWL8K_H2A_INT_DOORBELL                 (1 << 1)
#define  MWL8K_H2A_INT_PPA_READY          (1 << 0)

/* Device->host communications */
#define MWL8K_HIU_A2H_INTERRUPT_EVENTS          0x00000c2c
#define MWL8K_HIU_A2H_INTERRUPT_STATUS          0x00000c30
#define MWL8K_HIU_A2H_INTERRUPT_MASK            0x00000c34
#define MWL8K_HIU_A2H_INTERRUPT_CLEAR_SEL 0x00000c38
#define MWL8K_HIU_A2H_INTERRUPT_STATUS_MASK     0x00000c3c
#define  MWL8K_A2H_INT_DUMMY              (1 << 20)
#define  MWL8K_A2H_INT_CHNL_SWITCHED            (1 << 11)
#define  MWL8K_A2H_INT_QUEUE_EMPTY        (1 << 10)
#define  MWL8K_A2H_INT_RADAR_DETECT       (1 << 7)
#define  MWL8K_A2H_INT_RADIO_ON                 (1 << 6)
#define  MWL8K_A2H_INT_RADIO_OFF          (1 << 5)
#define  MWL8K_A2H_INT_MAC_EVENT          (1 << 3)
#define  MWL8K_A2H_INT_OPC_DONE                 (1 << 2)
#define  MWL8K_A2H_INT_RX_READY                 (1 << 1)
#define  MWL8K_A2H_INT_TX_DONE                  (1 << 0)

#define MWL8K_A2H_EVENTS      (MWL8K_A2H_INT_DUMMY | \
                         MWL8K_A2H_INT_CHNL_SWITCHED | \
                         MWL8K_A2H_INT_QUEUE_EMPTY | \
                         MWL8K_A2H_INT_RADAR_DETECT | \
                         MWL8K_A2H_INT_RADIO_ON | \
                         MWL8K_A2H_INT_RADIO_OFF | \
                         MWL8K_A2H_INT_MAC_EVENT | \
                         MWL8K_A2H_INT_OPC_DONE | \
                         MWL8K_A2H_INT_RX_READY | \
                         MWL8K_A2H_INT_TX_DONE)

/* WME stream classes */
#define WME_AC_BE 0           /* best effort */
#define WME_AC_BK 1           /* background */
#define WME_AC_VI 2           /* video */
#define WME_AC_VO 3           /* voice */

#define MWL8K_RX_QUEUES       1
#define MWL8K_TX_QUEUES       4

00102 struct mwl8k_rx_queue {
      int rx_desc_count;

      /* hw receives here */
      int rx_head;

      /* refill descs here */
      int rx_tail;

      struct mwl8k_rx_desc *rx_desc_area;
      dma_addr_t rx_desc_dma;
      struct sk_buff **rx_skb;
};

00116 struct mwl8k_skb {
      /*
       * The DMA engine requires a modification to the payload.
       * If the skbuff is shared/cloned, it needs to be unshared.
       * This method is used to ensure the stack always gets back
       * the skbuff it sent for transmission.
       */
      struct sk_buff *clone;
      struct sk_buff *skb;
};

00127 struct mwl8k_tx_queue {
      /* hw transmits here */
      int tx_head;

      /* sw appends here */
      int tx_tail;

      struct ieee80211_tx_queue_stats tx_stats;
      struct mwl8k_tx_desc *tx_desc_area;
      dma_addr_t tx_desc_dma;
      struct mwl8k_skb *tx_skb;
};

/* Pointers to the firmware data and meta information about it.  */
00141 struct mwl8k_firmware {
      /* Microcode */
      struct firmware *ucode;

      /* Boot helper code */
      struct firmware *helper;
};

00149 struct mwl8k_priv {
      void __iomem *regs;
      struct ieee80211_hw *hw;

      struct pci_dev *pdev;
      u8 name[16];
      /* firmware access lock */
      spinlock_t fw_lock;

      /* firmware files and meta data */
      struct mwl8k_firmware fw;
      u32 part_num;

      /* lock held over TX and TX reap */
      spinlock_t tx_lock;
      u32 int_mask;

      struct ieee80211_vif *vif;
      struct list_head vif_list;

      struct ieee80211_channel *current_channel;

      /* power management status cookie from firmware */
      u32 *cookie;
      dma_addr_t cookie_dma;

      u16 num_mcaddrs;
      u16 region_code;
      u8 hw_rev;
      __le32 fw_rev;
      u32 wep_enabled;

      /*
       * Running count of TX packets in flight, to avoid
       * iterating over the transmit rings each time.
       */
      int pending_tx_pkts;

      struct mwl8k_rx_queue rxq[MWL8K_RX_QUEUES];
      struct mwl8k_tx_queue txq[MWL8K_TX_QUEUES];

      /* PHY parameters */
      struct ieee80211_supported_band band;
      struct ieee80211_channel channels[14];
      struct ieee80211_rate rates[12];

      /* RF preamble: Short, Long or Auto */
      u8    radio_preamble;
      u8    radio_state;

      /* WMM MODE 1 for enabled; 0 for disabled */
      bool wmm_mode;

      /* Set if PHY config is in progress */
      bool inconfig;

      /* XXX need to convert this to handle multiple interfaces */
      bool capture_beacon;
      u8 capture_bssid[IEEE80211_ADDR_LEN];
      struct sk_buff *beacon_skb;

      /*
       * This FJ worker has to be global as it is scheduled from the
       * RX handler.  At this point we don't know which interface it
       * belongs to until the list of bssids waiting to complete join
       * is checked.
       */
      struct work_struct finalize_join_worker;

      /* Tasklet to reclaim TX descriptors and buffers after tx */
      struct tasklet_struct tx_reclaim_task;

      /* Work thread to serialize configuration requests */
      struct workqueue_struct *config_wq;
      struct completion *hostcmd_wait;
      struct completion *tx_wait;
};

/* Per interface specific private data */
00228 struct mwl8k_vif {
      struct list_head node;

      /* backpointer to parent config block */
      struct mwl8k_priv *priv;

      /* BSS config of AP or IBSS from mac80211*/
      struct ieee80211_bss_conf bss_info;

      /* BSSID of AP or IBSS */
      u8    bssid[IEEE80211_ADDR_LEN];
      u8    mac_addr[IEEE80211_ADDR_LEN];

      /*
       * Subset of supported legacy rates.
       * Intersection of AP and STA supported rates.
       */
      struct ieee80211_rate legacy_rates[12];

      /* number of supported legacy rates */
      u8    legacy_nrates;

      /* Number of supported MCS rates. Work in progress */
      u8    mcs_nrates;

       /* Index into station database.Returned by update_sta_db call */
      u8    peer_id;

      /* Non AMPDU sequence number assigned by driver */
      u16   seqno;

      /* Note:There is no channel info,
       * refer to the master channel info in priv
       */
};

#define MWL8K_VIF(_vif) ((struct mwl8k_vif *)&((_vif)->drv_priv))

static const struct ieee80211_channel mwl8k_channels[] = {
      { .center_freq = 2412, .hw_value = 1, },
      { .center_freq = 2417, .hw_value = 2, },
      { .center_freq = 2422, .hw_value = 3, },
      { .center_freq = 2427, .hw_value = 4, },
      { .center_freq = 2432, .hw_value = 5, },
      { .center_freq = 2437, .hw_value = 6, },
      { .center_freq = 2442, .hw_value = 7, },
      { .center_freq = 2447, .hw_value = 8, },
      { .center_freq = 2452, .hw_value = 9, },
      { .center_freq = 2457, .hw_value = 10, },
      { .center_freq = 2462, .hw_value = 11, },
};

static const struct ieee80211_rate mwl8k_rates[] = {
      { .bitrate = 10, .hw_value = 2, },
      { .bitrate = 20, .hw_value = 4, },
      { .bitrate = 55, .hw_value = 11, },
      { .bitrate = 60, .hw_value = 12, },
      { .bitrate = 90, .hw_value = 18, },
      { .bitrate = 110, .hw_value = 22, },
      { .bitrate = 120, .hw_value = 24, },
      { .bitrate = 180, .hw_value = 36, },
      { .bitrate = 240, .hw_value = 48, },
      { .bitrate = 360, .hw_value = 72, },
      { .bitrate = 480, .hw_value = 96, },
      { .bitrate = 540, .hw_value = 108, },
};

/* Radio settings */
#define MWL8K_RADIO_FORCE           0x2
#define MWL8K_RADIO_ENABLE          0x1
#define MWL8K_RADIO_DISABLE         0x0
#define MWL8K_RADIO_AUTO_PREAMBLE   0x0005
#define MWL8K_RADIO_SHORT_PREAMBLE  0x0003
#define MWL8K_RADIO_LONG_PREAMBLE   0x0001

/* WMM */
#define MWL8K_WMM_ENABLE            1
#define MWL8K_WMM_DISABLE           0

#define MWL8K_RADIO_DEFAULT_PREAMBLE      MWL8K_RADIO_LONG_PREAMBLE

/* Slot time */

/* Short Slot: 9us slot time */
#define MWL8K_SHORT_SLOTTIME        1

/* Long slot: 20us slot time */
#define MWL8K_LONG_SLOTTIME         0

/* Set or get info from Firmware */
#define MWL8K_CMD_SET               0x0001
#define MWL8K_CMD_GET               0x0000

/* Firmware command codes */
#define MWL8K_CMD_CODE_DNLD         0x0001
#define MWL8K_CMD_GET_HW_SPEC       0x0003
#define MWL8K_CMD_MAC_MULTICAST_ADR 0x0010
#define MWL8K_CMD_GET_STAT          0x0014
#define MWL8K_CMD_RADIO_CONTROL           0x001C
#define MWL8K_CMD_RF_TX_POWER       0x001E
#define MWL8K_CMD_SET_PRE_SCAN            0x0107
#define MWL8K_CMD_SET_POST_SCAN           0x0108
#define MWL8K_CMD_SET_RF_CHANNEL    0x010A
#define MWL8K_CMD_SET_SLOT          0x0114
#define MWL8K_CMD_MIMO_CONFIG       0x0125
#define MWL8K_CMD_ENABLE_SNIFFER    0x0150
#define MWL8K_CMD_SET_WMM_MODE            0x0123
#define MWL8K_CMD_SET_EDCA_PARAMS   0x0115
#define MWL8K_CMD_SET_FINALIZE_JOIN 0x0111
#define MWL8K_CMD_UPDATE_STADB            0x1123
#define MWL8K_CMD_SET_RATEADAPT_MODE      0x0203
#define MWL8K_CMD_SET_LINKADAPT_MODE      0x0129
#define MWL8K_CMD_SET_AID           0x010d
#define MWL8K_CMD_SET_RATE          0x0110
#define MWL8K_CMD_USE_FIXED_RATE    0x0126
#define MWL8K_CMD_RTS_THRESHOLD           0x0113
#define MWL8K_CMD_ENCRYPTION        0x1122

static const char *mwl8k_cmd_name(u16 cmd, char *buf, int bufsize)
{
#define MWL8K_CMDNAME(x)      case MWL8K_CMD_##x: do {\
                              snprintf(buf, bufsize, "%s", #x);\
                              return buf;\
                              } while (0)
      switch (cmd & (~0x8000)) {
            MWL8K_CMDNAME(CODE_DNLD);
            MWL8K_CMDNAME(GET_HW_SPEC);
            MWL8K_CMDNAME(MAC_MULTICAST_ADR);
            MWL8K_CMDNAME(GET_STAT);
            MWL8K_CMDNAME(RADIO_CONTROL);
            MWL8K_CMDNAME(RF_TX_POWER);
            MWL8K_CMDNAME(SET_PRE_SCAN);
            MWL8K_CMDNAME(SET_POST_SCAN);
            MWL8K_CMDNAME(SET_RF_CHANNEL);
            MWL8K_CMDNAME(SET_SLOT);
            MWL8K_CMDNAME(MIMO_CONFIG);
            MWL8K_CMDNAME(ENABLE_SNIFFER);
            MWL8K_CMDNAME(SET_WMM_MODE);
            MWL8K_CMDNAME(SET_EDCA_PARAMS);
            MWL8K_CMDNAME(SET_FINALIZE_JOIN);
            MWL8K_CMDNAME(UPDATE_STADB);
            MWL8K_CMDNAME(SET_RATEADAPT_MODE);
            MWL8K_CMDNAME(SET_LINKADAPT_MODE);
            MWL8K_CMDNAME(SET_AID);
            MWL8K_CMDNAME(SET_RATE);
            MWL8K_CMDNAME(USE_FIXED_RATE);
            MWL8K_CMDNAME(RTS_THRESHOLD);
            MWL8K_CMDNAME(ENCRYPTION);
      default:
            snprintf(buf, bufsize, "0x%x", cmd);
      }
#undef MWL8K_CMDNAME

      return buf;
}

/* Hardware and firmware reset */
static void mwl8k_hw_reset(struct mwl8k_priv *priv)
{
      iowrite32(MWL8K_H2A_INT_RESET,
            priv->regs + MWL8K_HIU_H2A_INTERRUPT_EVENTS);
      iowrite32(MWL8K_H2A_INT_RESET,
            priv->regs + MWL8K_HIU_H2A_INTERRUPT_EVENTS);
      msleep(20);
}

/* Release fw image */
static void mwl8k_release_fw(struct firmware **fw)
{
      if (*fw == NULL)
            return;
      release_firmware(*fw);
      *fw = NULL;
}

static void mwl8k_release_firmware(struct mwl8k_priv *priv)
{
      mwl8k_release_fw(&priv->fw.ucode);
      mwl8k_release_fw(&priv->fw.helper);
}

/* Request fw image */
static int mwl8k_request_fw(struct mwl8k_priv *priv,
                        const char *fname, struct firmware **fw)
{
      /* release current image */
      if (*fw != NULL)
            mwl8k_release_fw(fw);

      return request_firmware((const struct firmware **)fw,
                                    fname, &priv->pdev->dev);
}

static int mwl8k_request_firmware(struct mwl8k_priv *priv, u32 part_num)
{
      u8 filename[64];
      int rc;

      priv->part_num = part_num;

      snprintf(filename, sizeof(filename),
             "mwl8k/helper_%u.fw", priv->part_num);

      rc = mwl8k_request_fw(priv, filename, &priv->fw.helper);
      if (rc) {
            printk(KERN_ERR
                  "%s Error requesting helper firmware file %s\n",
                  pci_name(priv->pdev), filename);
            return rc;
      }

      snprintf(filename, sizeof(filename),
             "mwl8k/fmimage_%u.fw", priv->part_num);

      rc = mwl8k_request_fw(priv, filename, &priv->fw.ucode);
      if (rc) {
            printk(KERN_ERR "%s Error requesting firmware file %s\n",
                              pci_name(priv->pdev), filename);
            mwl8k_release_fw(&priv->fw.helper);
            return rc;
      }

      return 0;
}

00453 struct mwl8k_cmd_pkt {
      __le16      code;
      __le16      length;
      __le16      seq_num;
      __le16      result;
      char  payload[0];
} __attribute__((packed));

/*
 * Firmware loading.
 */
static int
mwl8k_send_fw_load_cmd(struct mwl8k_priv *priv, void *data, int length)
{
      void __iomem *regs = priv->regs;
      dma_addr_t dma_addr;
      int rc;
      int loops;

      dma_addr = pci_map_single(priv->pdev, data, length, PCI_DMA_TODEVICE);
      if (pci_dma_mapping_error(priv->pdev, dma_addr))
            return -ENOMEM;

      iowrite32(dma_addr, regs + MWL8K_HIU_GEN_PTR);
      iowrite32(0, regs + MWL8K_HIU_INT_CODE);
      iowrite32(MWL8K_H2A_INT_DOORBELL,
            regs + MWL8K_HIU_H2A_INTERRUPT_EVENTS);
      iowrite32(MWL8K_H2A_INT_DUMMY,
            regs + MWL8K_HIU_H2A_INTERRUPT_EVENTS);

      rc = -ETIMEDOUT;
      loops = 1000;
      do {
            u32 int_code;

            int_code = ioread32(regs + MWL8K_HIU_INT_CODE);
            if (int_code == MWL8K_INT_CODE_CMD_FINISHED) {
                  iowrite32(0, regs + MWL8K_HIU_INT_CODE);
                  rc = 0;
                  break;
            }

            udelay(1);
      } while (--loops);

      pci_unmap_single(priv->pdev, dma_addr, length, PCI_DMA_TODEVICE);

      /*
       * Clear 'command done' interrupt bit.
       */
      loops = 1000;
      do {
            u32 status;

            status = ioread32(priv->regs +
                        MWL8K_HIU_A2H_INTERRUPT_STATUS);
            if (status & MWL8K_A2H_INT_OPC_DONE) {
                  iowrite32(~MWL8K_A2H_INT_OPC_DONE,
                        priv->regs + MWL8K_HIU_A2H_INTERRUPT_STATUS);
                  ioread32(priv->regs + MWL8K_HIU_A2H_INTERRUPT_STATUS);
                  break;
            }

            udelay(1);
      } while (--loops);

      return rc;
}

static int mwl8k_load_fw_image(struct mwl8k_priv *priv,
                        const u8 *data, size_t length)
{
      struct mwl8k_cmd_pkt *cmd;
      int done;
      int rc = 0;

      cmd = kmalloc(sizeof(*cmd) + 256, GFP_KERNEL);
      if (cmd == NULL)
            return -ENOMEM;

      cmd->code = cpu_to_le16(MWL8K_CMD_CODE_DNLD);
      cmd->seq_num = 0;
      cmd->result = 0;

      done = 0;
      while (length) {
            int block_size = length > 256 ? 256 : length;

            memcpy(cmd->payload, data + done, block_size);
            cmd->length = cpu_to_le16(block_size);

            rc = mwl8k_send_fw_load_cmd(priv, cmd,
                                    sizeof(*cmd) + block_size);
            if (rc)
                  break;

            done += block_size;
            length -= block_size;
      }

      if (!rc) {
            cmd->length = 0;
            rc = mwl8k_send_fw_load_cmd(priv, cmd, sizeof(*cmd));
      }

      kfree(cmd);

      return rc;
}

static int mwl8k_feed_fw_image(struct mwl8k_priv *priv,
                        const u8 *data, size_t length)
{
      unsigned char *buffer;
      int may_continue, rc = 0;
      u32 done, prev_block_size;

      buffer = kmalloc(1024, GFP_KERNEL);
      if (buffer == NULL)
            return -ENOMEM;

      done = 0;
      prev_block_size = 0;
      may_continue = 1000;
      while (may_continue > 0) {
            u32 block_size;

            block_size = ioread32(priv->regs + MWL8K_HIU_SCRATCH);
            if (block_size & 1) {
                  block_size &= ~1;
                  may_continue--;
            } else {
                  done += prev_block_size;
                  length -= prev_block_size;
            }

            if (block_size > 1024 || block_size > length) {
                  rc = -EOVERFLOW;
                  break;
            }

            if (length == 0) {
                  rc = 0;
                  break;
            }

            if (block_size == 0) {
                  rc = -EPROTO;
                  may_continue--;
                  udelay(1);
                  continue;
            }

            prev_block_size = block_size;
            memcpy(buffer, data + done, block_size);

            rc = mwl8k_send_fw_load_cmd(priv, buffer, block_size);
            if (rc)
                  break;
      }

      if (!rc && length != 0)
            rc = -EREMOTEIO;

      kfree(buffer);

      return rc;
}

static int mwl8k_load_firmware(struct mwl8k_priv *priv)
{
      int loops, rc;

      const u8 *ucode = priv->fw.ucode->data;
      size_t ucode_len = priv->fw.ucode->size;
      const u8 *helper = priv->fw.helper->data;
      size_t helper_len = priv->fw.helper->size;

      if (!memcmp(ucode, "\x01\x00\x00\x00", 4)) {
            rc = mwl8k_load_fw_image(priv, helper, helper_len);
            if (rc) {
                  printk(KERN_ERR "%s: unable to load firmware "
                        "helper image\n", pci_name(priv->pdev));
                  return rc;
            }
            msleep(1);

            rc = mwl8k_feed_fw_image(priv, ucode, ucode_len);
      } else {
            rc = mwl8k_load_fw_image(priv, ucode, ucode_len);
      }

      if (rc) {
            printk(KERN_ERR "%s: unable to load firmware data\n",
                  pci_name(priv->pdev));
            return rc;
      }

      iowrite32(MWL8K_MODE_STA, priv->regs + MWL8K_HIU_GEN_PTR);
      msleep(1);

      loops = 200000;
      do {
            if (ioread32(priv->regs + MWL8K_HIU_INT_CODE)
                                    == MWL8K_FWSTA_READY)
                  break;
            udelay(1);
      } while (--loops);

      return loops ? 0 : -ETIMEDOUT;
}


/*
 * Defines shared between transmission and reception.
 */
/* HT control fields for firmware */
00670 struct ewc_ht_info {
      __le16      control1;
      __le16      control2;
      __le16      control3;
} __attribute__((packed));

/* Firmware Station database operations */
#define MWL8K_STA_DB_ADD_ENTRY            0
#define MWL8K_STA_DB_MODIFY_ENTRY   1
#define MWL8K_STA_DB_DEL_ENTRY            2
#define MWL8K_STA_DB_FLUSH          3

/* Peer Entry flags - used to define the type of the peer node */
#define MWL8K_PEER_TYPE_ACCESSPOINT 2
#define MWL8K_PEER_TYPE_ADHOC_STATION     4

#define MWL8K_IEEE_LEGACY_DATA_RATES      12
#define MWL8K_MCS_BITMAP_SIZE       16
#define pad_size              16

00690 struct peer_capability_info {
      /* Peer type - AP vs. STA.  */
      __u8  peer_type;

      /* Basic 802.11 capabilities from assoc resp.  */
      __le16      basic_caps;

      /* Set if peer supports 802.11n high throughput (HT).  */
      __u8  ht_support;

      /* Valid if HT is supported.  */
      __le16      ht_caps;
      __u8  extended_ht_caps;
      struct ewc_ht_info      ewc_info;

      /* Legacy rate table. Intersection of our rates and peer rates.  */
      __u8  legacy_rates[MWL8K_IEEE_LEGACY_DATA_RATES];

      /* HT rate table. Intersection of our rates and peer rates.  */
      __u8  ht_rates[MWL8K_MCS_BITMAP_SIZE];
      __u8  pad[pad_size];

      /* If set, interoperability mode, no proprietary extensions.  */
      __u8  interop;
      __u8  pad2;
      __u8  station_id;
      __le16      amsdu_enabled;
} __attribute__((packed));

/* Inline functions to manipulate QoS field in data descriptor.  */
static inline u16 mwl8k_qos_setbit_tid(u16 qos, u8 tid)
{
      u16 val_mask = 0x000f;
      u16 qos_mask = ~val_mask;

      /* TID bits 0-3 */
      return (qos & qos_mask) | (tid & val_mask);
}

static inline u16 mwl8k_qos_setbit_eosp(u16 qos)
{
      u16 val_mask = 1 << 4;

      /* End of Service Period Bit 4 */
      return qos | val_mask;
}

static inline u16 mwl8k_qos_setbit_ack(u16 qos, u8 ack_policy)
{
      u16 val_mask = 0x3;
      u8    shift = 5;
      u16 qos_mask = ~(val_mask << shift);

      /* Ack Policy Bit 5-6 */
      return (qos & qos_mask) | ((ack_policy & val_mask) << shift);
}

static inline u16 mwl8k_qos_setbit_amsdu(u16 qos)
{
      u16 val_mask = 1 << 7;

      /* AMSDU present Bit 7 */
      return qos | val_mask;
}

static inline u16 mwl8k_qos_setbit_qlen(u16 qos, u8 len)
{
      u16 val_mask = 0xff;
      u8    shift = 8;
      u16 qos_mask = ~(val_mask << shift);

      /* Queue Length Bits 8-15 */
      return (qos & qos_mask) | ((len & val_mask) << shift);
}

/* DMA header used by firmware and hardware.  */
00766 struct mwl8k_dma_data {
      __le16 fwlen;
      struct ieee80211_hdr wh;
} __attribute__((packed));

/* Routines to add/remove DMA header from skb.  */
static inline int mwl8k_remove_dma_header(struct sk_buff *skb)
{
      struct mwl8k_dma_data *tr = (struct mwl8k_dma_data *)(skb->data);
      void *dst, *src = &tr->wh;
      __le16 fc = tr->wh.frame_control;
      int hdrlen = ieee80211_hdrlen(fc);
      u16 space = sizeof(struct mwl8k_dma_data) - hdrlen;

      dst = (void *)tr + space;
      if (dst != src) {
            memmove(dst, src, hdrlen);
            skb_pull(skb, space);
      }

      return 0;
}

static inline struct sk_buff *mwl8k_add_dma_header(struct sk_buff *skb)
{
      struct ieee80211_hdr *wh;
      u32 hdrlen, pktlen;
      struct mwl8k_dma_data *tr;

      wh = (struct ieee80211_hdr *)skb->data;
      hdrlen = ieee80211_hdrlen(wh->frame_control);
      pktlen = skb->len;

      /*
       * Copy up/down the 802.11 header; the firmware requires
       * we present a 2-byte payload length followed by a
       * 4-address header (w/o QoS), followed (optionally) by
       * any WEP/ExtIV header (but only filled in for CCMP).
       */
      if (hdrlen != sizeof(struct mwl8k_dma_data))
            skb_push(skb, sizeof(struct mwl8k_dma_data) - hdrlen);

      tr = (struct mwl8k_dma_data *)skb->data;
      if (wh != &tr->wh)
            memmove(&tr->wh, wh, hdrlen);

      /* Clear addr4 */
      memset(tr->wh.addr4, 0, IEEE80211_ADDR_LEN);

      /*
       * Firmware length is the length of the fully formed "802.11
       * payload".  That is, everything except for the 802.11 header.
       * This includes all crypto material including the MIC.
       */
      tr->fwlen = cpu_to_le16(pktlen - hdrlen);

      return skb;
}


/*
 * Packet reception.
 */
#define MWL8K_RX_CTRL_KEY_INDEX_MASK      0x30
#define MWL8K_RX_CTRL_OWNED_BY_HOST 0x02
#define MWL8K_RX_CTRL_AMPDU         0x01

00833 struct mwl8k_rx_desc {
      __le16 pkt_len;
      __u8 link_quality;
      __u8 noise_level;
      __le32 pkt_phys_addr;
      __le32 next_rx_desc_phys_addr;
      __le16 qos_control;
      __le16 rate_info;
      __le32 pad0[4];
      __u8 rssi;
      __u8 channel;
      __le16 pad1;
      __u8 rx_ctrl;
      __u8 rx_status;
      __u8 pad2[2];
} __attribute__((packed));

#define MWL8K_RX_DESCS        256
#define MWL8K_RX_MAXSZ        3800

static int mwl8k_rxq_init(struct ieee80211_hw *hw, int index)
{
      struct mwl8k_priv *priv = hw->priv;
      struct mwl8k_rx_queue *rxq = priv->rxq + index;
      int size;
      int i;

      rxq->rx_desc_count = 0;
      rxq->rx_head = 0;
      rxq->rx_tail = 0;

      size = MWL8K_RX_DESCS * sizeof(struct mwl8k_rx_desc);

      rxq->rx_desc_area =
            pci_alloc_consistent(priv->pdev, size, &rxq->rx_desc_dma);
      if (rxq->rx_desc_area == NULL) {
            printk(KERN_ERR "%s: failed to alloc RX descriptors\n",
                   priv->name);
            return -ENOMEM;
      }
      memset(rxq->rx_desc_area, 0, size);

      rxq->rx_skb = kmalloc(MWL8K_RX_DESCS *
                        sizeof(*rxq->rx_skb), GFP_KERNEL);
      if (rxq->rx_skb == NULL) {
            printk(KERN_ERR "%s: failed to alloc RX skbuff list\n",
                  priv->name);
            pci_free_consistent(priv->pdev, size,
                            rxq->rx_desc_area, rxq->rx_desc_dma);
            return -ENOMEM;
      }
      memset(rxq->rx_skb, 0, MWL8K_RX_DESCS * sizeof(*rxq->rx_skb));

      for (i = 0; i < MWL8K_RX_DESCS; i++) {
            struct mwl8k_rx_desc *rx_desc;
            int nexti;

            rx_desc = rxq->rx_desc_area + i;
            nexti = (i + 1) % MWL8K_RX_DESCS;

            rx_desc->next_rx_desc_phys_addr =
                  cpu_to_le32(rxq->rx_desc_dma
                                    + nexti * sizeof(*rx_desc));
            rx_desc->rx_ctrl = MWL8K_RX_CTRL_OWNED_BY_HOST;
      }

      return 0;
}

static int rxq_refill(struct ieee80211_hw *hw, int index, int limit)
{
      struct mwl8k_priv *priv = hw->priv;
      struct mwl8k_rx_queue *rxq = priv->rxq + index;
      int refilled;

      refilled = 0;
      while (rxq->rx_desc_count < MWL8K_RX_DESCS && limit--) {
            struct sk_buff *skb;
            int rx;

            skb = dev_alloc_skb(MWL8K_RX_MAXSZ);
            if (skb == NULL)
                  break;

            rxq->rx_desc_count++;

            rx = rxq->rx_tail;
            rxq->rx_tail = (rx + 1) % MWL8K_RX_DESCS;

            rxq->rx_desc_area[rx].pkt_phys_addr =
                  cpu_to_le32(pci_map_single(priv->pdev, skb->data,
                              MWL8K_RX_MAXSZ, DMA_FROM_DEVICE));

            rxq->rx_desc_area[rx].pkt_len = cpu_to_le16(MWL8K_RX_MAXSZ);
            rxq->rx_skb[rx] = skb;
            wmb();
            rxq->rx_desc_area[rx].rx_ctrl = 0;

            refilled++;
      }

      return refilled;
}

/* Must be called only when the card's reception is completely halted */
static void mwl8k_rxq_deinit(struct ieee80211_hw *hw, int index)
{
      struct mwl8k_priv *priv = hw->priv;
      struct mwl8k_rx_queue *rxq = priv->rxq + index;
      int i;

      for (i = 0; i < MWL8K_RX_DESCS; i++) {
            if (rxq->rx_skb[i] != NULL) {
                  unsigned long addr;

                  addr = le32_to_cpu(rxq->rx_desc_area[i].pkt_phys_addr);
                  pci_unmap_single(priv->pdev, addr, MWL8K_RX_MAXSZ,
                               PCI_DMA_FROMDEVICE);
                  kfree_skb(rxq->rx_skb[i]);
                  rxq->rx_skb[i] = NULL;
            }
      }

      kfree(rxq->rx_skb);
      rxq->rx_skb = NULL;

      pci_free_consistent(priv->pdev,
                      MWL8K_RX_DESCS * sizeof(struct mwl8k_rx_desc),
                      rxq->rx_desc_area, rxq->rx_desc_dma);
      rxq->rx_desc_area = NULL;
}


/*
 * Scan a list of BSSIDs to process for finalize join.
 * Allows for extension to process multiple BSSIDs.
 */
static inline int
mwl8k_capture_bssid(struct mwl8k_priv *priv, struct ieee80211_hdr *wh)
{
      return priv->capture_beacon &&
            ieee80211_is_beacon(wh->frame_control) &&
            !compare_ether_addr(wh->addr3, priv->capture_bssid);
}

static inline void mwl8k_save_beacon(struct mwl8k_priv *priv,
                                          struct sk_buff *skb)
{
      priv->capture_beacon = false;
      memset(priv->capture_bssid, 0, IEEE80211_ADDR_LEN);

      /*
       * Use GFP_ATOMIC as rxq_process is called from
       * the primary interrupt handler, memory allocation call
       * must not sleep.
       */
      priv->beacon_skb = skb_copy(skb, GFP_ATOMIC);
      if (priv->beacon_skb != NULL)
            queue_work(priv->config_wq,
                        &priv->finalize_join_worker);
}

static int rxq_process(struct ieee80211_hw *hw, int index, int limit)
{
      struct mwl8k_priv *priv = hw->priv;
      struct mwl8k_rx_queue *rxq = priv->rxq + index;
      int processed;

      processed = 0;
      while (rxq->rx_desc_count && limit--) {
            struct mwl8k_rx_desc *rx_desc;
            struct sk_buff *skb;
            struct ieee80211_rx_status status;
            unsigned long addr;
            struct ieee80211_hdr *wh;

            rx_desc = rxq->rx_desc_area + rxq->rx_head;
            if (!(rx_desc->rx_ctrl & MWL8K_RX_CTRL_OWNED_BY_HOST))
                  break;
            rmb();

            skb = rxq->rx_skb[rxq->rx_head];
            if (skb == NULL)
                  break;
            rxq->rx_skb[rxq->rx_head] = NULL;

            rxq->rx_head = (rxq->rx_head + 1) % MWL8K_RX_DESCS;
            rxq->rx_desc_count--;

            addr = le32_to_cpu(rx_desc->pkt_phys_addr);
            pci_unmap_single(priv->pdev, addr,
                              MWL8K_RX_MAXSZ, PCI_DMA_FROMDEVICE);

            skb_put(skb, le16_to_cpu(rx_desc->pkt_len));
            if (mwl8k_remove_dma_header(skb)) {
                  dev_kfree_skb(skb);
                  continue;
            }

            wh = (struct ieee80211_hdr *)skb->data;

            /*
             * Check for pending join operation. save a copy of
             * the beacon and schedule a tasklet to send finalize
             * join command to the firmware.
             */
            if (mwl8k_capture_bssid(priv, wh))
                  mwl8k_save_beacon(priv, skb);

            memset(&status, 0, sizeof(status));
            status.mactime = 0;
            status.signal = -rx_desc->rssi;
            status.noise = -rx_desc->noise_level;
            status.qual = rx_desc->link_quality;
            status.antenna = 1;
            status.rate_idx = 1;
            status.flag = 0;
            status.band = IEEE80211_BAND_2GHZ;
            status.freq = ieee80211_channel_to_frequency(rx_desc->channel);
            ieee80211_rx_irqsafe(hw, skb, &status);

            processed++;
      }

      return processed;
}


/*
 * Packet transmission.
 */

/* Transmit queue assignment.  */
enum {
      MWL8K_WME_AC_BK   = 0,        /* background access */
      MWL8K_WME_AC_BE   = 1,        /* best effort access */
      MWL8K_WME_AC_VI   = 2,        /* video access */
      MWL8K_WME_AC_VO   = 3,        /* voice access */
};

/* Transmit packet ACK policy */
#define MWL8K_TXD_ACK_POLICY_NORMAL       0
#define MWL8K_TXD_ACK_POLICY_NONE         1
#define MWL8K_TXD_ACK_POLICY_NO_EXPLICIT  2
#define MWL8K_TXD_ACK_POLICY_BLOCKACK           3

#define GET_TXQ(_ac) (\
            ((_ac) == WME_AC_VO) ? MWL8K_WME_AC_VO : \
            ((_ac) == WME_AC_VI) ? MWL8K_WME_AC_VI : \
            ((_ac) == WME_AC_BK) ? MWL8K_WME_AC_BK : \
            MWL8K_WME_AC_BE)

#define MWL8K_TXD_STATUS_IDLE             0x00000000
#define MWL8K_TXD_STATUS_USED             0x00000001
#define MWL8K_TXD_STATUS_OK               0x00000001
#define MWL8K_TXD_STATUS_OK_RETRY         0x00000002
#define MWL8K_TXD_STATUS_OK_MORE_RETRY          0x00000004
#define MWL8K_TXD_STATUS_MULTICAST_TX           0x00000008
#define MWL8K_TXD_STATUS_BROADCAST_TX           0x00000010
#define MWL8K_TXD_STATUS_FAILED_LINK_ERROR      0x00000020
#define MWL8K_TXD_STATUS_FAILED_EXCEED_LIMIT    0x00000040
#define MWL8K_TXD_STATUS_FAILED_AGING           0x00000080
#define MWL8K_TXD_STATUS_HOST_CMD         0x40000000
#define MWL8K_TXD_STATUS_FW_OWNED         0x80000000
#define  MWL8K_TXD_SOFTSTALE                    0x80
#define  MWL8K_TXD_SOFTSTALE_MGMT_RETRY               0x01

01100 struct mwl8k_tx_desc {
      __le32 status;
      __u8 data_rate;
      __u8 tx_priority;
      __le16 qos_control;
      __le32 pkt_phys_addr;
      __le16 pkt_len;
      __u8 dest_MAC_addr[IEEE80211_ADDR_LEN];
      __le32 next_tx_desc_phys_addr;
      __le32 reserved;
      __le16 rate_info;
      __u8 peer_id;
      __u8 tx_frag_cnt;
} __attribute__((packed));

#define MWL8K_TX_DESCS        128

static int mwl8k_txq_init(struct ieee80211_hw *hw, int index)
{
      struct mwl8k_priv *priv = hw->priv;
      struct mwl8k_tx_queue *txq = priv->txq + index;
      int size;
      int i;

      memset(&txq->tx_stats, 0,
            sizeof(struct ieee80211_tx_queue_stats));
      txq->tx_stats.limit = MWL8K_TX_DESCS;
      txq->tx_head = 0;
      txq->tx_tail = 0;

      size = MWL8K_TX_DESCS * sizeof(struct mwl8k_tx_desc);

      txq->tx_desc_area =
            pci_alloc_consistent(priv->pdev, size, &txq->tx_desc_dma);
      if (txq->tx_desc_area == NULL) {
            printk(KERN_ERR "%s: failed to alloc TX descriptors\n",
                   priv->name);
            return -ENOMEM;
      }
      memset(txq->tx_desc_area, 0, size);

      txq->tx_skb = kmalloc(MWL8K_TX_DESCS * sizeof(*txq->tx_skb),
                                                GFP_KERNEL);
      if (txq->tx_skb == NULL) {
            printk(KERN_ERR "%s: failed to alloc TX skbuff list\n",
                   priv->name);
            pci_free_consistent(priv->pdev, size,
                            txq->tx_desc_area, txq->tx_desc_dma);
            return -ENOMEM;
      }
      memset(txq->tx_skb, 0, MWL8K_TX_DESCS * sizeof(*txq->tx_skb));

      for (i = 0; i < MWL8K_TX_DESCS; i++) {
            struct mwl8k_tx_desc *tx_desc;
            int nexti;

            tx_desc = txq->tx_desc_area + i;
            nexti = (i + 1) % MWL8K_TX_DESCS;

            tx_desc->status = 0;
            tx_desc->next_tx_desc_phys_addr =
                  cpu_to_le32(txq->tx_desc_dma +
                                    nexti * sizeof(*tx_desc));
      }

      return 0;
}

static inline void mwl8k_tx_start(struct mwl8k_priv *priv)
{
      iowrite32(MWL8K_H2A_INT_PPA_READY,
            priv->regs + MWL8K_HIU_H2A_INTERRUPT_EVENTS);
      iowrite32(MWL8K_H2A_INT_DUMMY,
            priv->regs + MWL8K_HIU_H2A_INTERRUPT_EVENTS);
      ioread32(priv->regs + MWL8K_HIU_INT_CODE);
}

static inline int mwl8k_txq_busy(struct mwl8k_priv *priv)
{
      return priv->pending_tx_pkts;
}

01182 struct mwl8k_txq_info {
      u32 fw_owned;
      u32 drv_owned;
      u32 unused;
      u32 len;
      u32 head;
      u32 tail;
};

static int mwl8k_scan_tx_ring(struct mwl8k_priv *priv,
                        struct mwl8k_txq_info txinfo[],
                        u32 num_queues)
{
      int count, desc, status;
      struct mwl8k_tx_queue *txq;
      struct mwl8k_tx_desc *tx_desc;
      int ndescs = 0;

      memset(txinfo, 0, num_queues * sizeof(struct mwl8k_txq_info));
      spin_lock_bh(&priv->tx_lock);
      for (count = 0; count < num_queues; count++) {
            txq = priv->txq + count;
            txinfo[count].len = txq->tx_stats.len;
            txinfo[count].head = txq->tx_head;
            txinfo[count].tail = txq->tx_tail;
            for (desc = 0; desc < MWL8K_TX_DESCS; desc++) {
                  tx_desc = txq->tx_desc_area + desc;
                  status = le32_to_cpu(tx_desc->status);

                  if (status & MWL8K_TXD_STATUS_FW_OWNED)
                        txinfo[count].fw_owned++;
                  else
                        txinfo[count].drv_owned++;

                  if (tx_desc->pkt_len == 0)
                        txinfo[count].unused++;
            }
      }
      spin_unlock_bh(&priv->tx_lock);

      return ndescs;
}

static int mwl8k_tx_wait_empty(struct ieee80211_hw *hw, u32 delay_ms)
{
      u32 count = 0;
      unsigned long timeout = 0;
      struct mwl8k_priv *priv = hw->priv;
      DECLARE_COMPLETION_ONSTACK(cmd_wait);

      might_sleep();

      if (priv->tx_wait != NULL)
            printk(KERN_ERR "WARNING Previous TXWaitEmpty instance\n");

      spin_lock_bh(&priv->tx_lock);
      count = mwl8k_txq_busy(priv);
      if (count) {
            priv->tx_wait = &cmd_wait;
            if (priv->radio_state)
                  mwl8k_tx_start(priv);
      }
      spin_unlock_bh(&priv->tx_lock);

      if (count) {
            struct mwl8k_txq_info txinfo[4];
            int index;
            int newcount;

            timeout = wait_for_completion_timeout(&cmd_wait,
                              msecs_to_jiffies(delay_ms));
            if (timeout)
                  return 0;

            spin_lock_bh(&priv->tx_lock);
            priv->tx_wait = NULL;
            newcount = mwl8k_txq_busy(priv);
            spin_unlock_bh(&priv->tx_lock);

            printk(KERN_ERR "%s(%u) TIMEDOUT:%ums Pend:%u-->%u\n",
                   __func__, __LINE__, delay_ms, count, newcount);

            mwl8k_scan_tx_ring(priv, txinfo, 4);
            for (index = 0 ; index < 4; index++)
                  printk(KERN_ERR
                        "TXQ:%u L:%u H:%u T:%u FW:%u DRV:%u U:%u\n",
                              index,
                              txinfo[index].len,
                              txinfo[index].head,
                              txinfo[index].tail,
                              txinfo[index].fw_owned,
                              txinfo[index].drv_owned,
                              txinfo[index].unused);
            return -ETIMEDOUT;
      }

      return 0;
}

#define MWL8K_TXD_OK    (MWL8K_TXD_STATUS_OK | \
                   MWL8K_TXD_STATUS_OK_RETRY | \
                   MWL8K_TXD_STATUS_OK_MORE_RETRY)
#define MWL8K_TXD_SUCCESS(stat)           ((stat) & MWL8K_TXD_OK)
#define MWL8K_TXD_FAIL_RETRY(stat)  \
      ((stat) & (MWL8K_TXD_STATUS_FAILED_EXCEED_LIMIT))

static void mwl8k_txq_reclaim(struct ieee80211_hw *hw, int index, int force)
{
      struct mwl8k_priv *priv = hw->priv;
      struct mwl8k_tx_queue *txq = priv->txq + index;
      int wake = 0;

      while (txq->tx_stats.len > 0) {
            int tx;
            int rc;
            struct mwl8k_tx_desc *tx_desc;
            unsigned long addr;
            size_t size;
            struct sk_buff *skb;
            struct ieee80211_tx_info *info;
            u32 status;

            rc = 0;
            tx = txq->tx_head;
            tx_desc = txq->tx_desc_area + tx;

            status = le32_to_cpu(tx_desc->status);

            if (status & MWL8K_TXD_STATUS_FW_OWNED) {
                  if (!force)
                        break;
                  tx_desc->status &=
                        ~cpu_to_le32(MWL8K_TXD_STATUS_FW_OWNED);
            }

            txq->tx_head = (tx + 1) % MWL8K_TX_DESCS;
            BUG_ON(txq->tx_stats.len == 0);
            txq->tx_stats.len--;
            priv->pending_tx_pkts--;

            addr = le32_to_cpu(tx_desc->pkt_phys_addr);
            size = (u32)(le16_to_cpu(tx_desc->pkt_len));
            skb = txq->tx_skb[tx].skb;
            txq->tx_skb[tx].skb = NULL;

            BUG_ON(skb == NULL);
            pci_unmap_single(priv->pdev, addr, size, PCI_DMA_TODEVICE);

            rc = mwl8k_remove_dma_header(skb);

            /* Mark descriptor as unused */
            tx_desc->pkt_phys_addr = 0;
            tx_desc->pkt_len = 0;

            if (txq->tx_skb[tx].clone) {
                  /* Replace with original skb
                   * before returning to stack
                   * as buffer has been cloned
                   */
                  dev_kfree_skb(skb);
                  skb = txq->tx_skb[tx].clone;
                  txq->tx_skb[tx].clone = NULL;
            }

            if (rc) {
                  /* Something has gone wrong here.
                   * Failed to remove DMA header.
                   * Print error message and drop packet.
                   */
                  printk(KERN_ERR "%s: Error removing DMA header from "
                              "tx skb 0x%p.\n", priv->name, skb);

                  dev_kfree_skb(skb);
                  continue;
            }

            info = IEEE80211_SKB_CB(skb);
            ieee80211_tx_info_clear_status(info);

            /* Convert firmware status stuff into tx_status */
            if (MWL8K_TXD_SUCCESS(status)) {
                  /* Transmit OK */
                  info->flags |= IEEE80211_TX_STAT_ACK;
            }

            ieee80211_tx_status_irqsafe(hw, skb);

            wake = !priv->inconfig && priv->radio_state;
      }

      if (wake)
            ieee80211_wake_queue(hw, index);
}

/* must be called only when the card's transmit is completely halted */
static void mwl8k_txq_deinit(struct ieee80211_hw *hw, int index)
{
      struct mwl8k_priv *priv = hw->priv;
      struct mwl8k_tx_queue *txq = priv->txq + index;

      mwl8k_txq_reclaim(hw, index, 1);

      kfree(txq->tx_skb);
      txq->tx_skb = NULL;

      pci_free_consistent(priv->pdev,
                      MWL8K_TX_DESCS * sizeof(struct mwl8k_tx_desc),
                      txq->tx_desc_area, txq->tx_desc_dma);
      txq->tx_desc_area = NULL;
}

static int
mwl8k_txq_xmit(struct ieee80211_hw *hw, int index, struct sk_buff *skb)
{
      struct mwl8k_priv *priv = hw->priv;
      struct ieee80211_tx_info *tx_info;
      struct ieee80211_hdr *wh;
      struct mwl8k_tx_queue *txq;
      struct mwl8k_tx_desc *tx;
      struct mwl8k_dma_data *tr;
      struct mwl8k_vif *mwl8k_vif;
      struct sk_buff *org_skb = skb;
      dma_addr_t dma;
      u16 qos = 0;
      bool qosframe = false, ampduframe = false;
      bool mcframe = false, eapolframe = false;
      bool amsduframe = false;
      __le16 fc;

      txq = priv->txq + index;
      tx = txq->tx_desc_area + txq->tx_tail;

      BUG_ON(txq->tx_skb[txq->tx_tail].skb != NULL);

      /*
       * Append HW DMA header to start of packet.  Drop packet if
       * there is not enough space or a failure to unshare/unclone
       * the skb.
       */
      skb = mwl8k_add_dma_header(skb);

      if (skb == NULL) {
            printk(KERN_DEBUG "%s: failed to prepend HW DMA "
                  "header, dropping TX frame.\n", priv->name);
            dev_kfree_skb(org_skb);
            return NETDEV_TX_OK;
      }

      tx_info = IEEE80211_SKB_CB(skb);
      mwl8k_vif = MWL8K_VIF(tx_info->control.vif);
      tr = (struct mwl8k_dma_data *)skb->data;
      wh = &tr->wh;
      fc = wh->frame_control;
      qosframe = ieee80211_is_data_qos(fc);
      mcframe = is_multicast_ether_addr(wh->addr1);
      ampduframe = !!(tx_info->flags & IEEE80211_TX_CTL_AMPDU);

      if (tx_info->flags & IEEE80211_TX_CTL_ASSIGN_SEQ) {
            u16 seqno = mwl8k_vif->seqno;
            wh->seq_ctrl &= cpu_to_le16(IEEE80211_SCTL_FRAG);
            wh->seq_ctrl |= cpu_to_le16(seqno << 4);
            mwl8k_vif->seqno = seqno++ % 4096;
      }

      if (qosframe)
            qos = le16_to_cpu(*((__le16 *)ieee80211_get_qos_ctl(wh)));

      dma = pci_map_single(priv->pdev, skb->data,
                        skb->len, PCI_DMA_TODEVICE);

      if (pci_dma_mapping_error(priv->pdev, dma)) {
            printk(KERN_DEBUG "%s: failed to dma map skb, "
                  "dropping TX frame.\n", priv->name);

            if (org_skb != NULL)
                  dev_kfree_skb(org_skb);
            if (skb != NULL)
                  dev_kfree_skb(skb);
            return NETDEV_TX_OK;
      }

      /* Set desc header, cpu bit order.  */
      tx->status = 0;
      tx->data_rate = 0;
      tx->tx_priority = index;
      tx->qos_control = 0;
      tx->rate_info = 0;
      tx->peer_id = mwl8k_vif->peer_id;

      amsduframe = !!(qos & IEEE80211_QOS_CONTROL_A_MSDU_PRESENT);

      /* Setup firmware control bit fields for each frame type.  */
      if (ieee80211_is_mgmt(fc) || ieee80211_is_ctl(fc)) {
            tx->data_rate = 0;
            qos = mwl8k_qos_setbit_eosp(qos);
            /* Set Queue size to unspecified */
            qos = mwl8k_qos_setbit_qlen(qos, 0xff);
      } else if (ieee80211_is_data(fc)) {
            tx->data_rate = 1;
            if (mcframe)
                  tx->status |= MWL8K_TXD_STATUS_MULTICAST_TX;

            /*
             * Tell firmware to not send EAPOL pkts in an
             * aggregate.  Verify against mac80211 tx path.  If
             * stack turns off AMPDU for an EAPOL frame this
             * check will be removed.
             */
            if (eapolframe) {
                  qos = mwl8k_qos_setbit_ack(qos,
                        MWL8K_TXD_ACK_POLICY_NORMAL);
            } else {
                  /* Send pkt in an aggregate if AMPDU frame.  */
                  if (ampduframe)
                        qos = mwl8k_qos_setbit_ack(qos,
                              MWL8K_TXD_ACK_POLICY_BLOCKACK);
                  else
                        qos = mwl8k_qos_setbit_ack(qos,
                              MWL8K_TXD_ACK_POLICY_NORMAL);

                  if (amsduframe)
                        qos = mwl8k_qos_setbit_amsdu(qos);
            }
      }

      /* Convert to little endian */
      tx->qos_control = cpu_to_le16(qos);
      tx->status = cpu_to_le32(tx->status);
      tx->pkt_phys_addr = cpu_to_le32(dma);
      tx->pkt_len = cpu_to_le16(skb->len);

      txq->tx_skb[txq->tx_tail].skb = skb;
      txq->tx_skb[txq->tx_tail].clone =
            skb == org_skb ? NULL : org_skb;

      spin_lock_bh(&priv->tx_lock);

      tx->status = cpu_to_le32(MWL8K_TXD_STATUS_OK |
                              MWL8K_TXD_STATUS_FW_OWNED);
      wmb();
      txq->tx_stats.len++;
      priv->pending_tx_pkts++;
      txq->tx_stats.count++;
      txq->tx_tail++;

      if (txq->tx_tail == MWL8K_TX_DESCS)
            txq->tx_tail = 0;
      if (txq->tx_head == txq->tx_tail)
            ieee80211_stop_queue(hw, index);

      if (priv->inconfig) {
            /*
             * Silently queue packet when we are in the middle of
             * a config cycle.  Notify firmware only if we are
             * waiting for TXQs to empty.  If a packet is sent
             * before .config() is complete, perhaps it is better
             * to drop the packet, as the channel is being changed
             * and the packet will end up on the wrong channel.
             */
            printk(KERN_ERR "%s(): WARNING TX activity while "
                  "in config\n", __func__);

            if (priv->tx_wait != NULL)
                  mwl8k_tx_start(priv);
      } else
            mwl8k_tx_start(priv);

      spin_unlock_bh(&priv->tx_lock);

      return NETDEV_TX_OK;
}


/*
 * Command processing.
 */

/* Timeout firmware commands after 2000ms */
#define MWL8K_CMD_TIMEOUT_MS  2000

static int mwl8k_post_cmd(struct ieee80211_hw *hw, struct mwl8k_cmd_pkt *cmd)
{
      DECLARE_COMPLETION_ONSTACK(cmd_wait);
      struct mwl8k_priv *priv = hw->priv;
      void __iomem *regs = priv->regs;
      dma_addr_t dma_addr;
      unsigned int dma_size;
      int rc;
      u16 __iomem *result;
      unsigned long timeout = 0;
      u8 buf[32];

      cmd->result = 0xFFFF;
      dma_size = le16_to_cpu(cmd->length);
      dma_addr = pci_map_single(priv->pdev, cmd, dma_size,
                          PCI_DMA_BIDIRECTIONAL);
      if (pci_dma_mapping_error(priv->pdev, dma_addr))
            return -ENOMEM;

      if (priv->hostcmd_wait != NULL)
            printk(KERN_ERR "WARNING host command in progress\n");

      spin_lock_irq(&priv->fw_lock);
      priv->hostcmd_wait = &cmd_wait;
      iowrite32(dma_addr, regs + MWL8K_HIU_GEN_PTR);
      iowrite32(MWL8K_H2A_INT_DOORBELL,
            regs + MWL8K_HIU_H2A_INTERRUPT_EVENTS);
      iowrite32(MWL8K_H2A_INT_DUMMY,
            regs + MWL8K_HIU_H2A_INTERRUPT_EVENTS);
      spin_unlock_irq(&priv->fw_lock);

      timeout = wait_for_completion_timeout(&cmd_wait,
                        msecs_to_jiffies(MWL8K_CMD_TIMEOUT_MS));

      pci_unmap_single(priv->pdev, dma_addr, dma_size,
                              PCI_DMA_BIDIRECTIONAL);

      result = &cmd->result;
      if (!timeout) {
            spin_lock_irq(&priv->fw_lock);
            priv->hostcmd_wait = NULL;
            spin_unlock_irq(&priv->fw_lock);
            printk(KERN_ERR "%s: Command %s timeout after %u ms\n",
                   priv->name,
                   mwl8k_cmd_name(cmd->code, buf, sizeof(buf)),
                   MWL8K_CMD_TIMEOUT_MS);
            rc = -ETIMEDOUT;
      } else {
            rc = *result ? -EINVAL : 0;
            if (rc)
                  printk(KERN_ERR "%s: Command %s error 0x%x\n",
                         priv->name,
                         mwl8k_cmd_name(cmd->code, buf, sizeof(buf)),
                         *result);
      }

      return rc;
}

/*
 * GET_HW_SPEC.
 */
01624 struct mwl8k_cmd_get_hw_spec {
      struct mwl8k_cmd_pkt header;
      __u8 hw_rev;
      __u8 host_interface;
      __le16 num_mcaddrs;
      __u8 perm_addr[IEEE80211_ADDR_LEN];
      __le16 region_code;
      __le32 fw_rev;
      __le32 ps_cookie;
      __le32 caps;
      __u8 mcs_bitmap[16];
      __le32 rx_queue_ptr;
      __le32 num_tx_queues;
      __le32 tx_queue_ptrs[MWL8K_TX_QUEUES];
      __le32 caps2;
      __le32 num_tx_desc_per_queue;
      __le32 total_rx_desc;
} __attribute__((packed));

static int mwl8k_cmd_get_hw_spec(struct ieee80211_hw *hw)
{
      struct mwl8k_priv *priv = hw->priv;
      struct mwl8k_cmd_get_hw_spec *cmd;
      int rc;
      int i;

      cmd = kzalloc(sizeof(*cmd), GFP_KERNEL);
      if (cmd == NULL)
            return -ENOMEM;

      cmd->header.code = cpu_to_le16(MWL8K_CMD_GET_HW_SPEC);
      cmd->header.length = cpu_to_le16(sizeof(*cmd));

      memset(cmd->perm_addr, 0xff, sizeof(cmd->perm_addr));
      cmd->ps_cookie = cpu_to_le32(priv->cookie_dma);
      cmd->rx_queue_ptr = cpu_to_le32(priv->rxq[0].rx_desc_dma);
      cmd->num_tx_queues = cpu_to_le32(MWL8K_TX_QUEUES);
      for (i = 0; i < MWL8K_TX_QUEUES; i++)
            cmd->tx_queue_ptrs[i] = cpu_to_le32(priv->txq[i].tx_desc_dma);
      cmd->num_tx_desc_per_queue = cpu_to_le32(MWL8K_TX_DESCS);
      cmd->total_rx_desc = cpu_to_le32(MWL8K_RX_DESCS);

      rc = mwl8k_post_cmd(hw, &cmd->header);

      if (!rc) {
            SET_IEEE80211_PERM_ADDR(hw, cmd->perm_addr);
            priv->num_mcaddrs = le16_to_cpu(cmd->num_mcaddrs);
            priv->fw_rev = le32_to_cpu(cmd->fw_rev);
            priv->hw_rev = cmd->hw_rev;
            priv->region_code = le16_to_cpu(cmd->region_code);
      }

      kfree(cmd);
      return rc;
}

/*
 * CMD_MAC_MULTICAST_ADR.
 */
01683 struct mwl8k_cmd_mac_multicast_adr {
      struct mwl8k_cmd_pkt header;
      __le16 action;
      __le16 numaddr;
      __u8 addr[1][IEEE80211_ADDR_LEN];
};

#define MWL8K_ENABLE_RX_MULTICAST 0x000F
static int mwl8k_cmd_mac_multicast_adr(struct ieee80211_hw *hw,
                              int mc_count,
                              struct dev_addr_list *mclist)
{
      struct mwl8k_cmd_mac_multicast_adr *cmd;
      int index = 0;
      int rc;
      int size = sizeof(*cmd) + ((mc_count - 1) * IEEE80211_ADDR_LEN);
      cmd = kzalloc(size, GFP_KERNEL);
      if (cmd == NULL)
            return -ENOMEM;

      cmd->header.code = cpu_to_le16(MWL8K_CMD_MAC_MULTICAST_ADR);
      cmd->header.length = cpu_to_le16(size);
      cmd->action = cpu_to_le16(MWL8K_ENABLE_RX_MULTICAST);
      cmd->numaddr = cpu_to_le16(mc_count);
      while ((index < mc_count) && mclist) {
            if (mclist->da_addrlen != IEEE80211_ADDR_LEN) {
                  rc = -EINVAL;
                  goto mwl8k_cmd_mac_multicast_adr_exit;
            }
            memcpy(cmd->addr[index], mclist->da_addr, IEEE80211_ADDR_LEN);
            index++;
            mclist = mclist->next;
      }

      rc = mwl8k_post_cmd(hw, &cmd->header);

mwl8k_cmd_mac_multicast_adr_exit:
      kfree(cmd);
      return rc;
}

/*
 * CMD_802_11_GET_STAT.
 */
01727 struct mwl8k_cmd_802_11_get_stat {
      struct mwl8k_cmd_pkt header;
      __le16 action;
      __le32 stats[64];
} __attribute__((packed));

#define MWL8K_STAT_ACK_FAILURE      9
#define MWL8K_STAT_RTS_FAILURE      12
#define MWL8K_STAT_FCS_ERROR  24
#define MWL8K_STAT_RTS_SUCCESS      11

static int mwl8k_cmd_802_11_get_stat(struct ieee80211_hw *hw,
                        struct ieee80211_low_level_stats *stats)
{
      struct mwl8k_cmd_802_11_get_stat *cmd;
      int rc;

      cmd = kzalloc(sizeof(*cmd), GFP_KERNEL);
      if (cmd == NULL)
            return -ENOMEM;

      cmd->header.code = cpu_to_le16(MWL8K_CMD_GET_STAT);
      cmd->header.length = cpu_to_le16(sizeof(*cmd));
      cmd->action = cpu_to_le16(MWL8K_CMD_GET);

      rc = mwl8k_post_cmd(hw, &cmd->header);
      if (!rc) {
            stats->dot11ACKFailureCount =
                  le32_to_cpu(cmd->stats[MWL8K_STAT_ACK_FAILURE]);
            stats->dot11RTSFailureCount =
                  le32_to_cpu(cmd->stats[MWL8K_STAT_RTS_FAILURE]);
            stats->dot11FCSErrorCount =
                  le32_to_cpu(cmd->stats[MWL8K_STAT_FCS_ERROR]);
            stats->dot11RTSSuccessCount =
                  le32_to_cpu(cmd->stats[MWL8K_STAT_RTS_SUCCESS]);
      }
      kfree(cmd);

      return rc;
}

/*
 * CMD_802_11_RADIO_CONTROL.
 */
01771 struct mwl8k_cmd_802_11_radio_control {
      struct mwl8k_cmd_pkt header;
      __le16 action;
      __le16 control;
      __le16 radio_on;
} __attribute__((packed));

static int mwl8k_cmd_802_11_radio_control(struct ieee80211_hw *hw, int enable)
{
      struct mwl8k_priv *priv = hw->priv;
      struct mwl8k_cmd_802_11_radio_control *cmd;
      int rc;

      if (((enable & MWL8K_RADIO_ENABLE) == priv->radio_state) &&
          !(enable & MWL8K_RADIO_FORCE))
            return 0;

      enable &= MWL8K_RADIO_ENABLE;

      cmd = kzalloc(sizeof(*cmd), GFP_KERNEL);
      if (cmd == NULL)
            return -ENOMEM;

      cmd->header.code = cpu_to_le16(MWL8K_CMD_RADIO_CONTROL);
      cmd->header.length = cpu_to_le16(sizeof(*cmd));
      cmd->action = cpu_to_le16(MWL8K_CMD_SET);
      cmd->control = cpu_to_le16(priv->radio_preamble);
      cmd->radio_on = cpu_to_le16(enable ? 0x0001 : 0x0000);

      rc = mwl8k_post_cmd(hw, &cmd->header);
      kfree(cmd);

      if (!rc)
            priv->radio_state = enable;

      return rc;
}

static int
mwl8k_set_radio_preamble(struct ieee80211_hw *hw, bool short_preamble)
{
      struct mwl8k_priv *priv;

      if (hw == NULL || hw->priv == NULL)
            return -EINVAL;
      priv = hw->priv;

      priv->radio_preamble = (short_preamble ?
            MWL8K_RADIO_SHORT_PREAMBLE :
            MWL8K_RADIO_LONG_PREAMBLE);

      return mwl8k_cmd_802_11_radio_control(hw,
                  MWL8K_RADIO_ENABLE | MWL8K_RADIO_FORCE);
}

/*
 * CMD_802_11_RF_TX_POWER.
 */
#define MWL8K_TX_POWER_LEVEL_TOTAL  8

01831 struct mwl8k_cmd_802_11_rf_tx_power {
      struct mwl8k_cmd_pkt header;
      __le16 action;
      __le16 support_level;
      __le16 current_level;
      __le16 reserved;
      __le16 power_level_list[MWL8K_TX_POWER_LEVEL_TOTAL];
} __attribute__((packed));

static int mwl8k_cmd_802_11_rf_tx_power(struct ieee80211_hw *hw, int dBm)
{
      struct mwl8k_cmd_802_11_rf_tx_power *cmd;
      int rc;

      cmd = kzalloc(sizeof(*cmd), GFP_KERNEL);
      if (cmd == NULL)
            return -ENOMEM;

      cmd->header.code = cpu_to_le16(MWL8K_CMD_RF_TX_POWER);
      cmd->header.length = cpu_to_le16(sizeof(*cmd));
      cmd->action = cpu_to_le16(MWL8K_CMD_SET);
      cmd->support_level = cpu_to_le16(dBm);

      rc = mwl8k_post_cmd(hw, &cmd->header);
      kfree(cmd);

      return rc;
}

/*
 * CMD_SET_PRE_SCAN.
 */
01863 struct mwl8k_cmd_set_pre_scan {
      struct mwl8k_cmd_pkt header;
} __attribute__((packed));

static int mwl8k_cmd_set_pre_scan(struct ieee80211_hw *hw)
{
      struct mwl8k_cmd_set_pre_scan *cmd;
      int rc;

      cmd = kzalloc(sizeof(*cmd), GFP_KERNEL);
      if (cmd == NULL)
            return -ENOMEM;

      cmd->header.code = cpu_to_le16(MWL8K_CMD_SET_PRE_SCAN);
      cmd->header.length = cpu_to_le16(sizeof(*cmd));

      rc = mwl8k_post_cmd(hw, &cmd->header);
      kfree(cmd);

      return rc;
}

/*
 * CMD_SET_POST_SCAN.
 */
01888 struct mwl8k_cmd_set_post_scan {
      struct mwl8k_cmd_pkt header;
      __le32 isibss;
      __u8 bssid[IEEE80211_ADDR_LEN];
} __attribute__((packed));

static int
mwl8k_cmd_set_post_scan(struct ieee80211_hw *hw, __u8 mac[IEEE80211_ADDR_LEN])
{
      struct mwl8k_cmd_set_post_scan *cmd;
      int rc;

      cmd = kzalloc(sizeof(*cmd), GFP_KERNEL);
      if (cmd == NULL)
            return -ENOMEM;

      cmd->header.code = cpu_to_le16(MWL8K_CMD_SET_POST_SCAN);
      cmd->header.length = cpu_to_le16(sizeof(*cmd));
      cmd->isibss = 0;
      memcpy(cmd->bssid, mac, IEEE80211_ADDR_LEN);

      rc = mwl8k_post_cmd(hw, &cmd->header);
      kfree(cmd);

      return rc;
}

/*
 * CMD_SET_RF_CHANNEL.
 */
01918 struct mwl8k_cmd_set_rf_channel {
      struct mwl8k_cmd_pkt header;
      __le16 action;
      __u8 current_channel;
      __le32 channel_flags;
} __attribute__((packed));

static int mwl8k_cmd_set_rf_channel(struct ieee80211_hw *hw,
                            struct ieee80211_channel *channel)
{
      struct mwl8k_cmd_set_rf_channel *cmd;
      int rc;

      cmd = kzalloc(sizeof(*cmd), GFP_KERNEL);
      if (cmd == NULL)
            return -ENOMEM;

      cmd->header.code = cpu_to_le16(MWL8K_CMD_SET_RF_CHANNEL);
      cmd->header.length = cpu_to_le16(sizeof(*cmd));
      cmd->action = cpu_to_le16(MWL8K_CMD_SET);
      cmd->current_channel = channel->hw_value;
      if (channel->band == IEEE80211_BAND_2GHZ)
            cmd->channel_flags = cpu_to_le32(0x00000081);
      else
            cmd->channel_flags = cpu_to_le32(0x00000000);

      rc = mwl8k_post_cmd(hw, &cmd->header);
      kfree(cmd);

      return rc;
}

/*
 * CMD_SET_SLOT.
 */
01953 struct mwl8k_cmd_set_slot {
      struct mwl8k_cmd_pkt header;
      __le16 action;
      __u8 short_slot;
} __attribute__((packed));

static int mwl8k_cmd_set_slot(struct ieee80211_hw *hw, int slot_time)
{
      struct mwl8k_cmd_set_slot *cmd;
      int rc;

      cmd = kzalloc(sizeof(*cmd), GFP_KERNEL);
      if (cmd == NULL)
            return -ENOMEM;

      cmd->header.code = cpu_to_le16(MWL8K_CMD_SET_SLOT);
      cmd->header.length = cpu_to_le16(sizeof(*cmd));
      cmd->action = cpu_to_le16(MWL8K_CMD_SET);
      cmd->short_slot = slot_time == MWL8K_SHORT_SLOTTIME ? 1 : 0;

      rc = mwl8k_post_cmd(hw, &cmd->header);
      kfree(cmd);

      return rc;
}

/*
 * CMD_MIMO_CONFIG.
 */
01982 struct mwl8k_cmd_mimo_config {
      struct mwl8k_cmd_pkt header;
      __le32 action;
      __u8 rx_antenna_map;
      __u8 tx_antenna_map;
} __attribute__((packed));

static int mwl8k_cmd_mimo_config(struct ieee80211_hw *hw, __u8 rx, __u8 tx)
{
      struct mwl8k_cmd_mimo_config *cmd;
      int rc;

      cmd = kzalloc(sizeof(*cmd), GFP_KERNEL);
      if (cmd == NULL)
            return -ENOMEM;

      cmd->header.code = cpu_to_le16(MWL8K_CMD_MIMO_CONFIG);
      cmd->header.length = cpu_to_le16(sizeof(*cmd));
      cmd->action = cpu_to_le32((u32)MWL8K_CMD_SET);
      cmd->rx_antenna_map = rx;
      cmd->tx_antenna_map = tx;

      rc = mwl8k_post_cmd(hw, &cmd->header);
      kfree(cmd);

      return rc;
}

/*
 * CMD_ENABLE_SNIFFER.
 */
02013 struct mwl8k_cmd_enable_sniffer {
      struct mwl8k_cmd_pkt header;
      __le32 action;
} __attribute__((packed));

static int mwl8k_enable_sniffer(struct ieee80211_hw *hw, bool enable)
{
      struct mwl8k_cmd_enable_sniffer *cmd;
      int rc;

      cmd = kzalloc(sizeof(*cmd), GFP_KERNEL);
      if (cmd == NULL)
            return -ENOMEM;

      cmd->header.code = cpu_to_le16(MWL8K_CMD_ENABLE_SNIFFER);
      cmd->header.length = cpu_to_le16(sizeof(*cmd));
      cmd->action = enable ? cpu_to_le32((u32)MWL8K_CMD_SET) : 0;

      rc = mwl8k_post_cmd(hw, &cmd->header);
      kfree(cmd);

      return rc;
}

/*
 * CMD_SET_RATE_ADAPT_MODE.
 */
02040 struct mwl8k_cmd_set_rate_adapt_mode {
      struct mwl8k_cmd_pkt header;
      __le16 action;
      __le16 mode;
} __attribute__((packed));

static int mwl8k_cmd_setrateadaptmode(struct ieee80211_hw *hw, __u16 mode)
{
      struct mwl8k_cmd_set_rate_adapt_mode *cmd;
      int rc;

      cmd = kzalloc(sizeof(*cmd), GFP_KERNEL);
      if (cmd == NULL)
            return -ENOMEM;

      cmd->header.code = cpu_to_le16(MWL8K_CMD_SET_RATEADAPT_MODE);
      cmd->header.length = cpu_to_le16(sizeof(*cmd));
      cmd->action = cpu_to_le16(MWL8K_CMD_SET);
      cmd->mode = cpu_to_le16(mode);

      rc = mwl8k_post_cmd(hw, &cmd->header);
      kfree(cmd);

      return rc;
}

/*
 * CMD_SET_WMM_MODE.
 */
02069 struct mwl8k_cmd_set_wmm {
      struct mwl8k_cmd_pkt header;
      __le16 action;
} __attribute__((packed));

static int mwl8k_set_wmm(struct ieee80211_hw *hw, bool enable)
{
      struct mwl8k_priv *priv = hw->priv;
      struct mwl8k_cmd_set_wmm *cmd;
      int rc;

      cmd = kzalloc(sizeof(*cmd), GFP_KERNEL);
      if (cmd == NULL)
            return -ENOMEM;

      cmd->header.code = cpu_to_le16(MWL8K_CMD_SET_WMM_MODE);
      cmd->header.length = cpu_to_le16(sizeof(*cmd));
      cmd->action = enable ? cpu_to_le16(MWL8K_CMD_SET) : 0;

      rc = mwl8k_post_cmd(hw, &cmd->header);
      kfree(cmd);

      if (!rc)
            priv->wmm_mode = enable;

      return rc;
}

/*
 * CMD_SET_RTS_THRESHOLD.
 */
02100 struct mwl8k_cmd_rts_threshold {
      struct mwl8k_cmd_pkt header;
      __le16 action;
      __le16 threshold;
} __attribute__((packed));

static int mwl8k_rts_threshold(struct ieee80211_hw *hw,
                         u16 action, u16 *threshold)
{
      struct mwl8k_cmd_rts_threshold *cmd;
      int rc;

      cmd = kzalloc(sizeof(*cmd), GFP_KERNEL);
      if (cmd == NULL)
            return -ENOMEM;

      cmd->header.code = cpu_to_le16(MWL8K_CMD_RTS_THRESHOLD);
      cmd->header.length = cpu_to_le16(sizeof(*cmd));
      cmd->action = cpu_to_le16(action);
      cmd->threshold = cpu_to_le16(*threshold);

      rc = mwl8k_post_cmd(hw, &cmd->header);
      kfree(cmd);

      return rc;
}

/*
 * CMD_SET_EDCA_PARAMS.
 */
02130 struct mwl8k_cmd_set_edca_params {
      struct mwl8k_cmd_pkt header;

      /* See MWL8K_SET_EDCA_XXX below */
      __le16 action;

      /* TX opportunity in units of 32 us */
      __le16 txop;

      /* Log exponent of max contention period: 0...15*/
      __u8 log_cw_max;

      /* Log exponent of min contention period: 0...15 */
      __u8 log_cw_min;

      /* Adaptive interframe spacing in units of 32us */
      __u8 aifs;

      /* TX queue to configure */
      __u8 txq;
} __attribute__((packed));

#define MWL8K_GET_EDCA_ALL    0
#define MWL8K_SET_EDCA_CW     0x01
#define MWL8K_SET_EDCA_TXOP   0x02
#define MWL8K_SET_EDCA_AIFS   0x04

#define MWL8K_SET_EDCA_ALL    (MWL8K_SET_EDCA_CW | \
                         MWL8K_SET_EDCA_TXOP | \
                         MWL8K_SET_EDCA_AIFS)

static int
mwl8k_set_edca_params(struct ieee80211_hw *hw, __u8 qnum,
            __u16 cw_min, __u16 cw_max,
            __u8 aifs, __u16 txop)
{
      struct mwl8k_cmd_set_edca_params *cmd;
      u32 log_cw_min, log_cw_max;
      int rc;

      cmd = kzalloc(sizeof(*cmd), GFP_KERNEL);
      if (cmd == NULL)
            return -ENOMEM;

      log_cw_min = ilog2(cw_min+1);
      log_cw_max = ilog2(cw_max+1);
      cmd->header.code = cpu_to_le16(MWL8K_CMD_SET_EDCA_PARAMS);
      cmd->header.length = cpu_to_le16(sizeof(*cmd));

      cmd->action = cpu_to_le16(MWL8K_SET_EDCA_ALL);
      cmd->txop = cpu_to_le16(txop);
      cmd->log_cw_max = (u8)log_cw_max;
      cmd->log_cw_min = (u8)log_cw_min;
      cmd->aifs = aifs;
      cmd->txq = qnum;

      rc = mwl8k_post_cmd(hw, &cmd->header);
      kfree(cmd);

      return rc;
}

/*
 * CMD_FINALIZE_JOIN.
 */

/* FJ beacon buffer size is compiled into the firmware.  */
#define MWL8K_FJ_BEACON_MAXLEN      128

02199 struct mwl8k_cmd_finalize_join {
      struct mwl8k_cmd_pkt header;
      __le32 sleep_interval;  /* Number of beacon periods to sleep */
      __u8 beacon_data[MWL8K_FJ_BEACON_MAXLEN];
} __attribute__((packed));

static int mwl8k_finalize_join(struct ieee80211_hw *hw, void *frame,
                        __u16 framelen, __u16 dtim)
{
      struct mwl8k_cmd_finalize_join *cmd;
      struct ieee80211_mgmt *payload = frame;
      u16 hdrlen;
      u32 payload_len;
      int rc;

      if (frame == NULL)
            return -EINVAL;

      cmd = kzalloc(sizeof(*cmd), GFP_KERNEL);
      if (cmd == NULL)
            return -ENOMEM;

      cmd->header.code = cpu_to_le16(MWL8K_CMD_SET_FINALIZE_JOIN);
      cmd->header.length = cpu_to_le16(sizeof(*cmd));

      if (dtim)
            cmd->sleep_interval = cpu_to_le32(dtim);
      else
            cmd->sleep_interval = cpu_to_le32(1);

      hdrlen = ieee80211_hdrlen(payload->frame_control);

      payload_len = framelen > hdrlen ? framelen - hdrlen : 0;

      /* XXX TBD Might just have to abort and return an error */
      if (payload_len > MWL8K_FJ_BEACON_MAXLEN)
            printk(KERN_ERR "%s(): WARNING: Incomplete beacon "
                  "sent to firmware. Sz=%u MAX=%u\n", __func__,
                  payload_len, MWL8K_FJ_BEACON_MAXLEN);

      payload_len = payload_len > MWL8K_FJ_BEACON_MAXLEN ?
                        MWL8K_FJ_BEACON_MAXLEN : payload_len;

      if (payload && payload_len)
            memcpy(cmd->beacon_data, &payload->u.beacon, payload_len);

      rc = mwl8k_post_cmd(hw, &cmd->header);
      kfree(cmd);
      return rc;
}

/*
 * CMD_UPDATE_STADB.
 */
02253 struct mwl8k_cmd_update_sta_db {
      struct mwl8k_cmd_pkt header;

      /* See STADB_ACTION_TYPE */
      __le32      action;

      /* Peer MAC address */
      __u8  peer_addr[IEEE80211_ADDR_LEN];

      __le32      reserved;

      /* Peer info - valid during add/update.  */
      struct peer_capability_info   peer_info;
} __attribute__((packed));

static int mwl8k_cmd_update_sta_db(struct ieee80211_hw *hw,
            struct ieee80211_vif *vif, __u32 action)
{
      struct mwl8k_vif *mv_vif = MWL8K_VIF(vif);
      struct ieee80211_bss_conf *info = &mv_vif->bss_info;
      struct mwl8k_cmd_update_sta_db *cmd;
      struct peer_capability_info *peer_info;
      struct ieee80211_rate *bitrates = mv_vif->legacy_rates;
      DECLARE_MAC_BUF(mac);
      int rc;
      __u8 count, *rates;

      cmd = kzalloc(sizeof(*cmd), GFP_KERNEL);
      if (cmd == NULL)
            return -ENOMEM;

      cmd->header.code = cpu_to_le16(MWL8K_CMD_UPDATE_STADB);
      cmd->header.length = cpu_to_le16(sizeof(*cmd));

      cmd->action = cpu_to_le32(action);
      peer_info = &cmd->peer_info;
      memcpy(cmd->peer_addr, mv_vif->bssid, IEEE80211_ADDR_LEN);

      switch (action) {
      case MWL8K_STA_DB_ADD_ENTRY:
      case MWL8K_STA_DB_MODIFY_ENTRY:
            /* Build peer_info block */
            peer_info->peer_type = MWL8K_PEER_TYPE_ACCESSPOINT;
            peer_info->basic_caps = cpu_to_le16(info->assoc_capability);
            peer_info->interop = 1;
            peer_info->amsdu_enabled = 0;

            rates = peer_info->legacy_rates;
            for (count = 0 ; count < mv_vif->legacy_nrates; count++)
                  rates[count] = bitrates[count].hw_value;

            rc = mwl8k_post_cmd(hw, &cmd->header);
            if (rc == 0)
                  mv_vif->peer_id = peer_info->station_id;

            break;

      case MWL8K_STA_DB_DEL_ENTRY:
      case MWL8K_STA_DB_FLUSH:
      default:
            rc = mwl8k_post_cmd(hw, &cmd->header);
            if (rc == 0)
                  mv_vif->peer_id = 0;
            break;
      }
      kfree(cmd);

      return rc;
}

/*
 * CMD_SET_AID.
 */
#define IEEE80211_OPMODE_DISABLED               0x00
#define IEEE80211_OPMODE_NON_MEMBER_PROT_MODE         0x01
#define IEEE80211_OPMODE_ONE_20MHZ_STA_PROT_MODE      0x02
#define IEEE80211_OPMODE_HTMIXED_PROT_MODE            0x03

#define MWL8K_RATE_INDEX_MAX_ARRAY              14

#define MWL8K_FRAME_PROT_DISABLED               0x00
#define MWL8K_FRAME_PROT_11G                    0x07
#define MWL8K_FRAME_PROT_11N_HT_40MHZ_ONLY            0x02
#define MWL8K_FRAME_PROT_11N_HT_ALL             0x06
#define MWL8K_FRAME_PROT_MASK                   0x07

02339 struct mwl8k_cmd_update_set_aid {
      struct      mwl8k_cmd_pkt header;
      __le16      aid;

       /* AP's MAC address (BSSID) */
      __u8  bssid[IEEE80211_ADDR_LEN];
      __le16      protection_mode;
      __u8  supp_rates[MWL8K_RATE_INDEX_MAX_ARRAY];
} __attribute__((packed));

static int mwl8k_cmd_set_aid(struct ieee80211_hw *hw,
                              struct ieee80211_vif *vif)
{
      struct mwl8k_vif *mv_vif = MWL8K_VIF(vif);
      struct ieee80211_bss_conf *info = &mv_vif->bss_info;
      struct mwl8k_cmd_update_set_aid *cmd;
      struct ieee80211_rate *bitrates = mv_vif->legacy_rates;
      int count;
      u16 prot_mode;
      int rc;

      cmd = kzalloc(sizeof(*cmd), GFP_KERNEL);
      if (cmd == NULL)
            return -ENOMEM;

      cmd->header.code = cpu_to_le16(MWL8K_CMD_SET_AID);
      cmd->header.length = cpu_to_le16(sizeof(*cmd));
      cmd->aid = cpu_to_le16(info->aid);

      memcpy(cmd->bssid, mv_vif->bssid, IEEE80211_ADDR_LEN);

      prot_mode = MWL8K_FRAME_PROT_DISABLED;

      if (info->use_cts_prot) {
            prot_mode = MWL8K_FRAME_PROT_11G;
      } else {
            switch (info->ht_operation_mode &
                  IEEE80211_HT_OP_MODE_PROTECTION) {
            case IEEE80211_HT_OP_MODE_PROTECTION_20MHZ:
                  prot_mode = MWL8K_FRAME_PROT_11N_HT_40MHZ_ONLY;
                  break;
            case IEEE80211_HT_OP_MODE_PROTECTION_NONHT_MIXED:
                  prot_mode = MWL8K_FRAME_PROT_11N_HT_ALL;
                  break;
            default:
                  prot_mode = MWL8K_FRAME_PROT_DISABLED;
                  break;
            }
      }

      cmd->protection_mode = cpu_to_le16(prot_mode);

      for (count = 0; count < mv_vif->legacy_nrates; count++)
            cmd->supp_rates[count] = bitrates[count].hw_value;

      rc = mwl8k_post_cmd(hw, &cmd->header);
      kfree(cmd);

      return rc;
}

/*
 * CMD_SET_RATE.
 */
02403 struct mwl8k_cmd_update_rateset {
      struct      mwl8k_cmd_pkt header;
      __u8  legacy_rates[MWL8K_RATE_INDEX_MAX_ARRAY];

      /* Bitmap for supported MCS codes.  */
      __u8  mcs_set[MWL8K_IEEE_LEGACY_DATA_RATES];
      __u8  reserved[MWL8K_IEEE_LEGACY_DATA_RATES];
} __attribute__((packed));

static int mwl8k_update_rateset(struct ieee80211_hw *hw,
            struct ieee80211_vif *vif)
{
      struct mwl8k_vif *mv_vif = MWL8K_VIF(vif);
      struct mwl8k_cmd_update_rateset *cmd;
      struct ieee80211_rate *bitrates = mv_vif->legacy_rates;
      int count;
      int rc;

      cmd = kzalloc(sizeof(*cmd), GFP_KERNEL);
      if (cmd == NULL)
            return -ENOMEM;

      cmd->header.code = cpu_to_le16(MWL8K_CMD_SET_RATE);
      cmd->header.length = cpu_to_le16(sizeof(*cmd));

      for (count = 0; count < mv_vif->legacy_nrates; count++)
            cmd->legacy_rates[count] = bitrates[count].hw_value;

      rc = mwl8k_post_cmd(hw, &cmd->header);
      kfree(cmd);

      return rc;
}

/*
 * CMD_USE_FIXED_RATE.
 */
#define MWL8K_RATE_TABLE_SIZE 8
#define MWL8K_UCAST_RATE      0
#define MWL8K_MCAST_RATE      1
#define MWL8K_BCAST_RATE      2

#define MWL8K_USE_FIXED_RATE  0x0001
#define MWL8K_USE_AUTO_RATE   0x0002

02448 struct mwl8k_rate_entry {
      /* Set to 1 if HT rate, 0 if legacy.  */
      __le32      is_ht_rate;

      /* Set to 1 to use retry_count field.  */
      __le32      enable_retry;

      /* Specified legacy rate or MCS.  */
      __le32      rate;

      /* Number of allowed retries.  */
      __le32      retry_count;
} __attribute__((packed));

02462 struct mwl8k_rate_table {
      /* 1 to allow specified rate and below */
      __le32      allow_rate_drop;
      __le32      num_rates;
      struct mwl8k_rate_entry rate_entry[MWL8K_RATE_TABLE_SIZE];
} __attribute__((packed));

02469 struct mwl8k_cmd_use_fixed_rate {
      struct      mwl8k_cmd_pkt header;
      __le32      action;
      struct mwl8k_rate_table rate_table;

      /* Unicast, Broadcast or Multicast */
      __le32      rate_type;
      __le32      reserved1;
      __le32      reserved2;
} __attribute__((packed));

static int mwl8k_cmd_use_fixed_rate(struct ieee80211_hw *hw,
      u32 action, u32 rate_type, struct mwl8k_rate_table *rate_table)
{
      struct mwl8k_cmd_use_fixed_rate *cmd;
      int count;
      int rc;

      cmd = kzalloc(sizeof(*cmd), GFP_KERNEL);
      if (cmd == NULL)
            return -ENOMEM;

      cmd->header.code = cpu_to_le16(MWL8K_CMD_USE_FIXED_RATE);
      cmd->header.length = cpu_to_le16(sizeof(*cmd));

      cmd->action = cpu_to_le32(action);
      cmd->rate_type = cpu_to_le32(rate_type);

      if (rate_table != NULL) {
            /* Copy over each field manually so
            * that bitflipping can be done
            */
            cmd->rate_table.allow_rate_drop =
                        cpu_to_le32(rate_table->allow_rate_drop);
            cmd->rate_table.num_rates =
                        cpu_to_le32(rate_table->num_rates);

            for (count = 0; count < rate_table->num_rates; count++) {
                  struct mwl8k_rate_entry *dst =
                        &cmd->rate_table.rate_entry[count];
                  struct mwl8k_rate_entry *src =
                        &rate_table->rate_entry[count];

                  dst->is_ht_rate = cpu_to_le32(src->is_ht_rate);
                  dst->enable_retry = cpu_to_le32(src->enable_retry);
                  dst->rate = cpu_to_le32(src->rate);
                  dst->retry_count = cpu_to_le32(src->retry_count);
            }
      }

      rc = mwl8k_post_cmd(hw, &cmd->header);
      kfree(cmd);

      return rc;
}


/*
 * Interrupt handling.
 */
static irqreturn_t mwl8k_interrupt(int irq, void *dev_id)
{
      struct ieee80211_hw *hw = dev_id;
      struct mwl8k_priv *priv = hw->priv;
      u32 status;

      status = ioread32(priv->regs + MWL8K_HIU_A2H_INTERRUPT_STATUS);
      iowrite32(~status, priv->regs + MWL8K_HIU_A2H_INTERRUPT_STATUS);

      status &= priv->int_mask;
      if (!status)
            return IRQ_NONE;

      if (status & MWL8K_A2H_INT_TX_DONE)
            tasklet_schedule(&priv->tx_reclaim_task);

      if (status & MWL8K_A2H_INT_RX_READY) {
            while (rxq_process(hw, 0, 1))
                  rxq_refill(hw, 0, 1);
      }

      if (status & MWL8K_A2H_INT_OPC_DONE) {
            if (priv->hostcmd_wait != NULL) {
                  complete(priv->hostcmd_wait);
                  priv->hostcmd_wait = NULL;
            }
      }

      if (status & MWL8K_A2H_INT_QUEUE_EMPTY) {
            if (!priv->inconfig &&
                  priv->radio_state &&
                  mwl8k_txq_busy(priv))
                        mwl8k_tx_start(priv);
      }

      return IRQ_HANDLED;
}


/*
 * Core driver operations.
 */
static int mwl8k_tx(struct ieee80211_hw *hw, struct sk_buff *skb)
{
      struct mwl8k_priv *priv = hw->priv;
      int index = skb_get_queue_mapping(skb);
      int rc;

      if (priv->current_channel == NULL) {
            printk(KERN_DEBUG "%s: dropped TX frame since radio "
                   "disabled\n", priv->name);
            dev_kfree_skb(skb);
            return NETDEV_TX_OK;
      }

      rc = mwl8k_txq_xmit(hw, index, skb);

      return rc;
}

02589 struct mwl8k_work_struct {
      /* Initialized by mwl8k_queue_work().  */
      struct work_struct wt;

      /* Required field passed in to mwl8k_queue_work().  */
      struct ieee80211_hw *hw;

      /* Required field passed in to mwl8k_queue_work().  */
      int (*wfunc)(struct work_struct *w);

      /* Initialized by mwl8k_queue_work().  */
      struct completion *cmd_wait;

      /* Result code.  */
      int rc;

      /*
       * Optional field. Refer to explanation of MWL8K_WQ_XXX_XXX
       * flags for explanation.  Defaults to MWL8K_WQ_DEFAULT_OPTIONS.
       */
      u32 options;

      /* Optional field.  Defaults to MWL8K_CONFIG_TIMEOUT_MS.  */
      unsigned long timeout_ms;

      /* Optional field.  Defaults to MWL8K_WQ_TXWAIT_ATTEMPTS.  */
      u32 txwait_attempts;

      /* Optional field.  Defaults to MWL8K_TXWAIT_MS.  */
      u32 tx_timeout_ms;
      u32 step;
};

/* Flags controlling behavior of config queue requests */

/* Caller spins while waiting for completion.  */
#define MWL8K_WQ_SPIN               0x00000001

/* Wait for TX queues to empty before proceeding with configuration.  */
#define MWL8K_WQ_TX_WAIT_EMPTY            0x00000002

/* Queue request and return immediately.  */
#define MWL8K_WQ_POST_REQUEST       0x00000004

/*
 * Caller sleeps and waits for task complete notification.
 * Do not use in atomic context.
 */
#define MWL8K_WQ_SLEEP              0x00000008

/* Free work struct when task is done.  */
#define MWL8K_WQ_FREE_WORKSTRUCT    0x00000010

/*
 * Config request is queued and returns to caller imediately.  Use
 * this in atomic context. Work struct is freed by mwl8k_queue_work()
 * when this flag is set.
 */
#define MWL8K_WQ_QUEUE_ONLY   (MWL8K_WQ_POST_REQUEST | \
                         MWL8K_WQ_FREE_WORKSTRUCT)

/* Default work queue behavior is to sleep and wait for tx completion.  */
#define MWL8K_WQ_DEFAULT_OPTIONS (MWL8K_WQ_SLEEP | MWL8K_WQ_TX_WAIT_EMPTY)

/*
 * Default config request timeout.  Add adjustments to make sure the
 * config thread waits long enough for both tx wait and cmd wait before
 * timing out.
 */

/* Time to wait for all TXQs to drain.  TX Doorbell is pressed each time.  */
#define MWL8K_TXWAIT_TIMEOUT_MS           1000

/* Default number of TX wait attempts.  */
#define MWL8K_WQ_TXWAIT_ATTEMPTS    4

/* Total time to wait for TXQ to drain.  */
#define MWL8K_TXWAIT_MS             (MWL8K_TXWAIT_TIMEOUT_MS * \
                                    MWL8K_WQ_TXWAIT_ATTEMPTS)

/* Scheduling slop.  */
#define MWL8K_OS_SCHEDULE_OVERHEAD_MS     200

#define MWL8K_CONFIG_TIMEOUT_MS     (MWL8K_CMD_TIMEOUT_MS + \
                         MWL8K_TXWAIT_MS + \
                         MWL8K_OS_SCHEDULE_OVERHEAD_MS)

static void mwl8k_config_thread(struct work_struct *wt)
{
      struct mwl8k_work_struct *worker = (struct mwl8k_work_struct *)wt;
      struct ieee80211_hw *hw = worker->hw;
      struct mwl8k_priv *priv = hw->priv;
      int rc = 0;

      spin_lock_irq(&priv->tx_lock);
      priv->inconfig = true;
      spin_unlock_irq(&priv->tx_lock);

      ieee80211_stop_queues(hw);

      /*
       * Wait for host queues to drain before doing PHY
       * reconfiguration. This avoids interrupting any in-flight
       * DMA transfers to the hardware.
       */
      if (worker->options & MWL8K_WQ_TX_WAIT_EMPTY) {
            u32 timeout;
            u32 time_remaining;
            u32 iter;
            u32 tx_wait_attempts = worker->txwait_attempts;

            time_remaining = worker->tx_timeout_ms;
            if (!tx_wait_attempts)
                  tx_wait_attempts = 1;

            timeout = worker->tx_timeout_ms/tx_wait_attempts;
            if (!timeout)
                  timeout = 1;

            iter = tx_wait_attempts;
            do {
                  int wait_time;

                  if (time_remaining > timeout) {
                        time_remaining -= timeout;
                        wait_time = timeout;
                  } else
                        wait_time = time_remaining;

                  if (!wait_time)
                        wait_time = 1;

                  rc = mwl8k_tx_wait_empty(hw, wait_time);
                  if (rc)
                        printk(KERN_ERR "%s() txwait timeout=%ums "
                              "Retry:%u/%u\n", __func__, timeout,
                              tx_wait_attempts - iter + 1,
                              tx_wait_attempts);

            } while (rc && --iter);

            rc = iter ? 0 : -ETIMEDOUT;
      }
      if (!rc)
            rc = worker->wfunc(wt);

      spin_lock_irq(&priv->tx_lock);
      priv->inconfig = false;
      if (priv->pending_tx_pkts && priv->radio_state)
            mwl8k_tx_start(priv);
      spin_unlock_irq(&priv->tx_lock);
      ieee80211_wake_queues(hw);

      worker->rc = rc;
      if (worker->options & MWL8K_WQ_SLEEP)
            complete(worker->cmd_wait);

      if (worker->options & MWL8K_WQ_FREE_WORKSTRUCT)
            kfree(wt);
}

static int mwl8k_queue_work(struct ieee80211_hw *hw,
                        struct mwl8k_work_struct *worker,
                        struct workqueue_struct *wqueue,
                        int (*wfunc)(struct work_struct *w))
{
      unsigned long timeout = 0;
      int rc = 0;

      DECLARE_COMPLETION_ONSTACK(cmd_wait);

      if (!worker->timeout_ms)
            worker->timeout_ms = MWL8K_CONFIG_TIMEOUT_MS;

      if (!worker->options)
            worker->options = MWL8K_WQ_DEFAULT_OPTIONS;

      if (!worker->txwait_attempts)
            worker->txwait_attempts = MWL8K_WQ_TXWAIT_ATTEMPTS;

      if (!worker->tx_timeout_ms)
            worker->tx_timeout_ms = MWL8K_TXWAIT_MS;

      worker->hw = hw;
      worker->cmd_wait = &cmd_wait;
      worker->rc = 1;
      worker->wfunc = wfunc;

      INIT_WORK(&worker->wt, mwl8k_config_thread);
      queue_work(wqueue, &worker->wt);

      if (worker->options & MWL8K_WQ_POST_REQUEST) {
            rc = 0;
      } else {
            if (worker->options & MWL8K_WQ_SPIN) {
                  timeout = worker->timeout_ms;
                  while (timeout && (worker->rc > 0)) {
                        mdelay(1);
                        timeout--;
                  }
            } else if (worker->options & MWL8K_WQ_SLEEP)
                  timeout = wait_for_completion_timeout(&cmd_wait,
                        msecs_to_jiffies(worker->timeout_ms));

            if (timeout)
                  rc = worker->rc;
            else {
                  cancel_work_sync(&worker->wt);
                  rc = -ETIMEDOUT;
            }
      }

      return rc;
}

02804 struct mwl8k_start_worker {
      struct mwl8k_work_struct header;
};

static int mwl8k_start_wt(struct work_struct *wt)
{
      struct mwl8k_start_worker *worker = (struct mwl8k_start_worker *)wt;
      struct ieee80211_hw *hw = worker->header.hw;
      struct mwl8k_priv *priv = hw->priv;
      int rc = 0;

      if (priv->vif != NULL) {
            rc = -EIO;
            goto mwl8k_start_exit;
      }

      /* Turn on radio */
      if (mwl8k_cmd_802_11_radio_control(hw, MWL8K_RADIO_ENABLE)) {
            rc = -EIO;
            goto mwl8k_start_exit;
      }

      /* Purge TX/RX HW queues */
      if (mwl8k_cmd_set_pre_scan(hw)) {
            rc = -EIO;
            goto mwl8k_start_exit;
      }

      if (mwl8k_cmd_set_post_scan(hw, "\x00\x00\x00\x00\x00\x00")) {
            rc = -EIO;
            goto mwl8k_start_exit;
      }

      /* Enable firmware rate adaptation */
      if (mwl8k_cmd_setrateadaptmode(hw, 0)) {
            rc = -EIO;
            goto mwl8k_start_exit;
      }

      /* Disable WMM. WMM gets enabled when stack sends WMM parms */
      if (mwl8k_set_wmm(hw, MWL8K_WMM_DISABLE)) {
            rc = -EIO;
            goto mwl8k_start_exit;
      }

      /* Disable sniffer mode */
      if (mwl8k_enable_sniffer(hw, 0))
            rc = -EIO;

mwl8k_start_exit:
      return rc;
}

static int mwl8k_start(struct ieee80211_hw *hw)
{
      struct mwl8k_start_worker *worker;
      struct mwl8k_priv *priv = hw->priv;
      int rc;

      /* Enable tx reclaim tasklet */
      tasklet_enable(&priv->tx_reclaim_task);

      rc = request_irq(priv->pdev->irq, &mwl8k_interrupt,
                   IRQF_SHARED, MWL8K_NAME, hw);
      if (rc) {
            printk(KERN_ERR "%s: failed to register IRQ handler\n",
                   priv->name);
            rc = -EIO;
            goto mwl8k_start_disable_tasklet;
      }

      /* Enable interrupts */
      iowrite32(priv->int_mask, priv->regs + MWL8K_HIU_A2H_INTERRUPT_MASK);

      worker = kzalloc(sizeof(*worker), GFP_KERNEL);
      if (worker == NULL) {
            rc = -ENOMEM;
            goto mwl8k_start_disable_irq;
      }

      rc = mwl8k_queue_work(hw, &worker->header,
                        priv->config_wq, mwl8k_start_wt);
      kfree(worker);
      if (!rc)
            return rc;

      if (rc == -ETIMEDOUT)
            printk(KERN_ERR "%s() timed out\n", __func__);

      rc = -EIO;

mwl8k_start_disable_irq:
      spin_lock_irq(&priv->tx_lock);
      iowrite32(0, priv->regs + MWL8K_HIU_A2H_INTERRUPT_MASK);
      spin_unlock_irq(&priv->tx_lock);
      free_irq(priv->pdev->irq, hw);

mwl8k_start_disable_tasklet:
      tasklet_disable(&priv->tx_reclaim_task);

      return rc;
}

02907 struct mwl8k_stop_worker {
      struct mwl8k_work_struct header;
};

static int mwl8k_stop_wt(struct work_struct *wt)
{
      struct mwl8k_stop_worker *worker = (struct mwl8k_stop_worker *)wt;
      struct ieee80211_hw *hw = worker->header.hw;
      int rc;

      rc = mwl8k_cmd_802_11_radio_control(hw, MWL8K_RADIO_DISABLE);

      return rc;
}

static void mwl8k_stop(struct ieee80211_hw *hw)
{
      int rc;
      struct mwl8k_stop_worker *worker;
      struct mwl8k_priv *priv = hw->priv;
      int i;

      if (priv->vif != NULL)
            return;

      ieee80211_stop_queues(hw);

      worker = kzalloc(sizeof(*worker), GFP_KERNEL);
      if (worker == NULL)
            return;

      rc = mwl8k_queue_work(hw, &worker->header,
                        priv->config_wq, mwl8k_stop_wt);
      kfree(worker);
      if (rc == -ETIMEDOUT)
            printk(KERN_ERR "%s() timed out\n", __func__);

      /* Disable interrupts */
      spin_lock_irq(&priv->tx_lock);
      iowrite32(0, priv->regs + MWL8K_HIU_A2H_INTERRUPT_MASK);
      spin_unlock_irq(&priv->tx_lock);
      free_irq(priv->pdev->irq, hw);

      /* Stop finalize join worker */
      cancel_work_sync(&priv->finalize_join_worker);
      if (priv->beacon_skb != NULL)
            dev_kfree_skb(priv->beacon_skb);

      /* Stop tx reclaim tasklet */
      tasklet_disable(&priv->tx_reclaim_task);

      /* Stop config thread */
      flush_workqueue(priv->config_wq);

      /* Return all skbs to mac80211 */
      for (i = 0; i < MWL8K_TX_QUEUES; i++)
            mwl8k_txq_reclaim(hw, i, 1);
}

static int mwl8k_add_interface(struct ieee80211_hw *hw,
                        struct ieee80211_if_init_conf *conf)
{
      struct mwl8k_priv *priv = hw->priv;
      struct mwl8k_vif *mwl8k_vif;

      /*
       * We only support one active interface at a time.
       */
      if (priv->vif != NULL)
            return -EBUSY;

      /*
       * We only support managed interfaces for now.
       */
      if (conf->type != NL80211_IFTYPE_STATION &&
          conf->type != NL80211_IFTYPE_MONITOR)
            return -EINVAL;

      /* Clean out driver private area */
      mwl8k_vif = MWL8K_VIF(conf->vif);
      memset(mwl8k_vif, 0, sizeof(*mwl8k_vif));

      /* Save the mac address */
      memcpy(mwl8k_vif->mac_addr, conf->mac_addr, IEEE80211_ADDR_LEN);

      /* Back pointer to parent config block */
      mwl8k_vif->priv = priv;

      /* Setup initial PHY parameters */
      memcpy(mwl8k_vif->legacy_rates ,
            priv->rates, sizeof(mwl8k_vif->legacy_rates));
      mwl8k_vif->legacy_nrates = ARRAY_SIZE(priv->rates);

      /* Set Initial sequence number to zero */
      mwl8k_vif->seqno = 0;

      priv->vif = conf->vif;
      priv->current_channel = NULL;

      return 0;
}

static void mwl8k_remove_interface(struct ieee80211_hw *hw,
                           struct ieee80211_if_init_conf *conf)
{
      struct mwl8k_priv *priv = hw->priv;

      if (priv->vif == NULL)
            return;

      priv->vif = NULL;
}

03020 struct mwl8k_config_worker {
      struct mwl8k_work_struct header;
      u32 changed;
};

static int mwl8k_config_wt(struct work_struct *wt)
{
      struct mwl8k_config_worker *worker =
            (struct mwl8k_config_worker *)wt;
      struct ieee80211_hw *hw = worker->header.hw;
      struct ieee80211_conf *conf = &hw->conf;
      struct mwl8k_priv *priv = hw->priv;
      int rc = 0;

      if (!conf->radio_enabled) {
            mwl8k_cmd_802_11_radio_control(hw, MWL8K_RADIO_DISABLE);
            priv->current_channel = NULL;
            rc = 0;
            goto mwl8k_config_exit;
      }

      if (mwl8k_cmd_802_11_radio_control(hw, MWL8K_RADIO_ENABLE)) {
            rc = -EINVAL;
            goto mwl8k_config_exit;
      }

      priv->current_channel = conf->channel;

      if (mwl8k_cmd_set_rf_channel(hw, conf->channel)) {
            rc = -EINVAL;
            goto mwl8k_config_exit;
      }

      if (conf->power_level > 18)
            conf->power_level = 18;
      if (mwl8k_cmd_802_11_rf_tx_power(hw, conf->power_level)) {
            rc = -EINVAL;
            goto mwl8k_config_exit;
      }

      if (mwl8k_cmd_mimo_config(hw, 0x7, 0x7))
            rc = -EINVAL;

mwl8k_config_exit:
      return rc;
}

static int mwl8k_config(struct ieee80211_hw *hw, u32 changed)
{
      int rc = 0;
      struct mwl8k_config_worker *worker;
      struct mwl8k_priv *priv = hw->priv;

      worker = kzalloc(sizeof(*worker), GFP_KERNEL);
      if (worker == NULL)
            return -ENOMEM;

      worker->changed = changed;
      rc = mwl8k_queue_work(hw, &worker->header,
                        priv->config_wq, mwl8k_config_wt);
      if (rc == -ETIMEDOUT) {
            printk(KERN_ERR "%s() timed out.\n", __func__);
            rc = -EINVAL;
      }

      kfree(worker);

      /*
       * mac80211 will crash on anything other than -EINVAL on
       * error. Looks like wireless extensions which calls mac80211
       * may be the actual culprit...
       */
      return rc ? -EINVAL : 0;
}

03095 struct mwl8k_bss_info_changed_worker {
      struct mwl8k_work_struct header;
      struct ieee80211_vif *vif;
      struct ieee80211_bss_conf *info;
      u32 changed;
};

static int mwl8k_bss_info_changed_wt(struct work_struct *wt)
{
      struct mwl8k_bss_info_changed_worker *worker =
            (struct mwl8k_bss_info_changed_worker *)wt;
      struct ieee80211_hw *hw = worker->header.hw;
      struct ieee80211_vif *vif = worker->vif;
      struct ieee80211_bss_conf *info = worker->info;
      u32 changed;
      int rc;

      struct mwl8k_priv *priv = hw->priv;
      struct mwl8k_vif *mwl8k_vif = MWL8K_VIF(vif);

      changed = worker->changed;
      priv->capture_beacon = false;

      if (info->assoc) {
            memcpy(&mwl8k_vif->bss_info, info,
                  sizeof(struct ieee80211_bss_conf));

            /* Install rates */
            if (mwl8k_update_rateset(hw, vif))
                  goto mwl8k_bss_info_changed_exit;

            /* Turn on rate adaptation */
            if (mwl8k_cmd_use_fixed_rate(hw, MWL8K_USE_AUTO_RATE,
                  MWL8K_UCAST_RATE, NULL))
                  goto mwl8k_bss_info_changed_exit;

            /* Set radio preamble */
            if (mwl8k_set_radio_preamble(hw,
                        info->use_short_preamble))
                  goto mwl8k_bss_info_changed_exit;

            /* Set slot time */
            if (mwl8k_cmd_set_slot(hw, info->use_short_slot ?
                        MWL8K_SHORT_SLOTTIME : MWL8K_LONG_SLOTTIME))
                  goto mwl8k_bss_info_changed_exit;

            /* Update peer rate info */
            if (mwl8k_cmd_update_sta_db(hw, vif,
                        MWL8K_STA_DB_MODIFY_ENTRY))
                  goto mwl8k_bss_info_changed_exit;

            /* Set AID */
            if (mwl8k_cmd_set_aid(hw, vif))
                  goto mwl8k_bss_info_changed_exit;

            /*
             * Finalize the join.  Tell rx handler to process
             * next beacon from our BSSID.
             */
            memcpy(priv->capture_bssid,
                        mwl8k_vif->bssid, IEEE80211_ADDR_LEN);
            priv->capture_beacon = true;
      } else {
            mwl8k_cmd_update_sta_db(hw, vif, MWL8K_STA_DB_DEL_ENTRY);
            memset(&mwl8k_vif->bss_info, 0,
                  sizeof(struct ieee80211_bss_conf));
            memset(mwl8k_vif->bssid, 0, IEEE80211_ADDR_LEN);
      }

mwl8k_bss_info_changed_exit:
      rc = 0;
      return rc;
}

static void mwl8k_bss_info_changed(struct ieee80211_hw *hw,
                           struct ieee80211_vif *vif,
                           struct ieee80211_bss_conf *info,
                           u32 changed)
{
      struct mwl8k_bss_info_changed_worker *worker;
      struct mwl8k_priv *priv = hw->priv;
      struct mwl8k_vif *mv_vif = MWL8K_VIF(vif);
      int rc;

      if (changed & BSS_CHANGED_BSSID)
            memcpy(mv_vif->bssid, info->bssid, IEEE80211_ADDR_LEN);

      if ((changed & BSS_CHANGED_ASSOC) == 0)
            return;

      worker = kzalloc(sizeof(*worker), GFP_KERNEL);
      if (worker == NULL)
            return;

      worker->vif = vif;
      worker->info = info;
      worker->changed = changed;
      rc = mwl8k_queue_work(hw, &worker->header,
                        priv->config_wq,
                        mwl8k_bss_info_changed_wt);
      kfree(worker);
      if (rc == -ETIMEDOUT)
            printk(KERN_ERR "%s() timed out\n", __func__);
}

03200 struct mwl8k_configure_filter_worker {
      struct mwl8k_work_struct header;
      unsigned int changed_flags;
      unsigned int *total_flags;
      int mc_count;
      struct dev_addr_list *mclist;
};

#define MWL8K_SUPPORTED_IF_FLAGS    FIF_BCN_PRBRESP_PROMISC

static int mwl8k_configure_filter_wt(struct work_struct *wt)
{
      struct mwl8k_configure_filter_worker *worker =
            (struct mwl8k_configure_filter_worker *)wt;

      struct ieee80211_hw *hw = worker->header.hw;
      unsigned int changed_flags = worker->changed_flags;
      unsigned int *total_flags = worker->total_flags;
      int mc_count = worker->mc_count;
      struct dev_addr_list *mclist = worker->mclist;

      struct mwl8k_priv *priv = hw->priv;
      int rc = 0;

      if (changed_flags & FIF_BCN_PRBRESP_PROMISC) {
            if (*total_flags & FIF_BCN_PRBRESP_PROMISC)
                  rc = mwl8k_cmd_set_pre_scan(hw);
            else {
                  u8 *bssid;

                  bssid = "\x00\x00\x00\x00\x00\x00";
                  if (priv->vif != NULL)
                        bssid = MWL8K_VIF(priv->vif)->bssid;

                  rc = mwl8k_cmd_set_post_scan(hw, bssid);
            }
      }

      if (rc)
            goto mwl8k_configure_filter_exit;
      if (mc_count) {
            mc_count = mc_count < priv->num_mcaddrs ?
                        mc_count : priv->num_mcaddrs;
            rc = mwl8k_cmd_mac_multicast_adr(hw, mc_count, mclist);
            if (rc)
                  printk(KERN_ERR
                  "%s()Error setting multicast addresses\n",
                  __func__);
      }

mwl8k_configure_filter_exit:
      return rc;
}

static void mwl8k_configure_filter(struct ieee80211_hw *hw,
                           unsigned int changed_flags,
                           unsigned int *total_flags,
                           int mc_count,
                           struct dev_addr_list *mclist)
{

      struct mwl8k_configure_filter_worker *worker;
      struct mwl8k_priv *priv = hw->priv;

      /* Clear unsupported feature flags */
      *total_flags &= MWL8K_SUPPORTED_IF_FLAGS;

      if (!(changed_flags & MWL8K_SUPPORTED_IF_FLAGS) && !mc_count)
            return;

      worker = kzalloc(sizeof(*worker), GFP_ATOMIC);
      if (worker == NULL)
            return;

      worker->header.options = MWL8K_WQ_QUEUE_ONLY | MWL8K_WQ_TX_WAIT_EMPTY;
      worker->changed_flags = changed_flags;
      worker->total_flags = total_flags;
      worker->mc_count = mc_count;
      worker->mclist = mclist;

      mwl8k_queue_work(hw, &worker->header, priv->config_wq,
                   mwl8k_configure_filter_wt);
}

03284 struct mwl8k_set_rts_threshold_worker {
      struct mwl8k_work_struct header;
      u32 value;
};

static int mwl8k_set_rts_threshold_wt(struct work_struct *wt)
{
      struct mwl8k_set_rts_threshold_worker *worker =
            (struct mwl8k_set_rts_threshold_worker *)wt;

      struct ieee80211_hw *hw = worker->header.hw;
      u16 threshold = (u16)(worker->value);
      int rc;

      rc = mwl8k_rts_threshold(hw, MWL8K_CMD_SET, &threshold);

      return rc;
}

static int mwl8k_set_rts_threshold(struct ieee80211_hw *hw, u32 value)
{
      int rc;
      struct mwl8k_set_rts_threshold_worker *worker;
      struct mwl8k_priv *priv = hw->priv;

      worker = kzalloc(sizeof(*worker), GFP_KERNEL);
      if (worker == NULL)
            return -ENOMEM;

      worker->value = value;

      rc = mwl8k_queue_work(hw, &worker->header,
                        priv->config_wq,
                        mwl8k_set_rts_threshold_wt);
      kfree(worker);

      if (rc == -ETIMEDOUT) {
            printk(KERN_ERR "%s() timed out\n", __func__);
            rc = -EINVAL;
      }

      return rc;
}

03328 struct mwl8k_conf_tx_worker {
      struct mwl8k_work_struct header;
      u16 queue;
      const struct ieee80211_tx_queue_params *params;
};

static int mwl8k_conf_tx_wt(struct work_struct *wt)
{
      struct mwl8k_conf_tx_worker *worker =
      (struct mwl8k_conf_tx_worker *)wt;

      struct ieee80211_hw *hw = worker->header.hw;
      u16 queue = worker->queue;
      const struct ieee80211_tx_queue_params *params = worker->params;

      struct mwl8k_priv *priv = hw->priv;
      int rc = 0;

      if (priv->wmm_mode == MWL8K_WMM_DISABLE)
            if (mwl8k_set_wmm(hw, MWL8K_WMM_ENABLE)) {
                  rc = -EINVAL;
                  goto mwl8k_conf_tx_exit;
      }

      if (mwl8k_set_edca_params(hw, GET_TXQ(queue), params->cw_min,
            params->cw_max, params->aifs, params->txop))
                  rc = -EINVAL;
mwl8k_conf_tx_exit:
      return rc;
}

static int mwl8k_conf_tx(struct ieee80211_hw *hw, u16 queue,
                   const struct ieee80211_tx_queue_params *params)
{
      int rc;
      struct mwl8k_conf_tx_worker *worker;
      struct mwl8k_priv *priv = hw->priv;

      worker = kzalloc(sizeof(*worker), GFP_KERNEL);
      if (worker == NULL)
            return -ENOMEM;

      worker->queue = queue;
      worker->params = params;
      rc = mwl8k_queue_work(hw, &worker->header,
                        priv->config_wq, mwl8k_conf_tx_wt);
      kfree(worker);
      if (rc == -ETIMEDOUT) {
            printk(KERN_ERR "%s() timed out\n", __func__);
            rc = -EINVAL;
      }
      return rc;
}

static int mwl8k_get_tx_stats(struct ieee80211_hw *hw,
                        struct ieee80211_tx_queue_stats *stats)
{
      struct mwl8k_priv *priv = hw->priv;
      struct mwl8k_tx_queue *txq;
      int index;

      spin_lock_bh(&priv->tx_lock);
      for (index = 0; index < MWL8K_TX_QUEUES; index++) {
            txq = priv->txq + index;
            memcpy(&stats[index], &txq->tx_stats,
                  sizeof(struct ieee80211_tx_queue_stats));
      }
      spin_unlock_bh(&priv->tx_lock);
      return 0;
}

03399 struct mwl8k_get_stats_worker {
      struct mwl8k_work_struct header;
      struct ieee80211_low_level_stats *stats;
};

static int mwl8k_get_stats_wt(struct work_struct *wt)
{
      struct mwl8k_get_stats_worker *worker =
            (struct mwl8k_get_stats_worker *)wt;

      return mwl8k_cmd_802_11_get_stat(worker->header.hw, worker->stats);
}

static int mwl8k_get_stats(struct ieee80211_hw *hw,
                     struct ieee80211_low_level_stats *stats)
{
      int rc;
      struct mwl8k_get_stats_worker *worker;
      struct mwl8k_priv *priv = hw->priv;

      worker = kzalloc(sizeof(*worker), GFP_KERNEL);
      if (worker == NULL)
            return -ENOMEM;

      worker->stats = stats;
      rc = mwl8k_queue_work(hw, &worker->header,
                        priv->config_wq, mwl8k_get_stats_wt);

      kfree(worker);
      if (rc == -ETIMEDOUT) {
            printk(KERN_ERR "%s() timed out\n", __func__);
            rc = -EINVAL;
      }

      return rc;
}

static const struct ieee80211_ops mwl8k_ops = {
      .tx               = mwl8k_tx,
      .start                  = mwl8k_start,
      .stop             = mwl8k_stop,
      .add_interface          = mwl8k_add_interface,
      .remove_interface = mwl8k_remove_interface,
      .config                 = mwl8k_config,
      .bss_info_changed = mwl8k_bss_info_changed,
      .configure_filter = mwl8k_configure_filter,
      .set_rts_threshold      = mwl8k_set_rts_threshold,
      .conf_tx          = mwl8k_conf_tx,
      .get_tx_stats           = mwl8k_get_tx_stats,
      .get_stats        = mwl8k_get_stats,
};

static void mwl8k_tx_reclaim_handler(unsigned long data)
{
      int i;
      struct ieee80211_hw *hw = (struct ieee80211_hw *) data;
      struct mwl8k_priv *priv = hw->priv;

      spin_lock_bh(&priv->tx_lock);
      for (i = 0; i < MWL8K_TX_QUEUES; i++)
            mwl8k_txq_reclaim(hw, i, 0);

      if (priv->tx_wait != NULL) {
            int count = mwl8k_txq_busy(priv);
            if (count == 0) {
                  complete(priv->tx_wait);
                  priv->tx_wait = NULL;
            }
      }
      spin_unlock_bh(&priv->tx_lock);
}

static void mwl8k_finalize_join_worker(struct work_struct *work)
{
      struct mwl8k_priv *priv =
            container_of(work, struct mwl8k_priv, finalize_join_worker);
      struct sk_buff *skb = priv->beacon_skb;
      u8 dtim = (MWL8K_VIF(priv->vif))->bss_info.dtim_period;

      mwl8k_finalize_join(priv->hw, skb->data, skb->len, dtim);
      dev_kfree_skb(skb);

      priv->beacon_skb = NULL;
}

static int __devinit mwl8k_probe(struct pci_dev *pdev,
                         const struct pci_device_id *id)
{
      struct ieee80211_hw *hw;
      struct mwl8k_priv *priv;
      DECLARE_MAC_BUF(mac);
      int rc;
      int i;
      u8 *fw;

      rc = pci_enable_device(pdev);
      if (rc) {
            printk(KERN_ERR "%s: Cannot enable new PCI device\n",
                   MWL8K_NAME);
            return rc;
      }

      rc = pci_request_regions(pdev, MWL8K_NAME);
      if (rc) {
            printk(KERN_ERR "%s: Cannot obtain PCI resources\n",
                   MWL8K_NAME);
            return rc;
      }

      pci_set_master(pdev);

      hw = ieee80211_alloc_hw(sizeof(*priv), &mwl8k_ops);
      if (hw == NULL) {
            printk(KERN_ERR "%s: ieee80211 alloc failed\n", MWL8K_NAME);
            rc = -ENOMEM;
            goto err_free_reg;
      }

      priv = hw->priv;
      priv->hw = hw;
      priv->pdev = pdev;
      priv->hostcmd_wait = NULL;
      priv->tx_wait = NULL;
      priv->inconfig = false;
      priv->wep_enabled = 0;
      priv->wmm_mode = false;
      priv->pending_tx_pkts = 0;
      strncpy(priv->name, MWL8K_NAME, sizeof(priv->name));

      spin_lock_init(&priv->fw_lock);

      SET_IEEE80211_DEV(hw, &pdev->dev);
      pci_set_drvdata(pdev, hw);

      priv->regs = pci_iomap(pdev, 1, 0x10000);
      if (priv->regs == NULL) {
            printk(KERN_ERR "%s: Cannot map device memory\n", priv->name);
            goto err_iounmap;
      }

      memcpy(priv->channels, mwl8k_channels, sizeof(mwl8k_channels));
      priv->band.band = IEEE80211_BAND_2GHZ;
      priv->band.channels = priv->channels;
      priv->band.n_channels = ARRAY_SIZE(mwl8k_channels);
      priv->band.bitrates = priv->rates;
      priv->band.n_bitrates = ARRAY_SIZE(mwl8k_rates);
      hw->wiphy->bands[IEEE80211_BAND_2GHZ] = &priv->band;

      BUILD_BUG_ON(sizeof(priv->rates) != sizeof(mwl8k_rates));
      memcpy(priv->rates, mwl8k_rates, sizeof(mwl8k_rates));

      /*
       * Extra headroom is the size of the required DMA header
       * minus the size of the smallest 802.11 frame (CTS frame).
       */
      hw->extra_tx_headroom =
            sizeof(struct mwl8k_dma_data) - sizeof(struct ieee80211_cts);

      hw->channel_change_time = 10;

      hw->queues = MWL8K_TX_QUEUES;

      hw->wiphy->interface_modes =
            BIT(NL80211_IFTYPE_STATION) | BIT(NL80211_IFTYPE_MONITOR);

      /* Set rssi and noise values to dBm */
      hw->flags |= (IEEE80211_HW_SIGNAL_DBM | IEEE80211_HW_NOISE_DBM);
      hw->vif_data_size = sizeof(struct mwl8k_vif);
      priv->vif = NULL;

      /* Set default radio state and preamble */
      priv->radio_preamble = MWL8K_RADIO_DEFAULT_PREAMBLE;
      priv->radio_state = MWL8K_RADIO_DISABLE;

      /* Finalize join worker */
      INIT_WORK(&priv->finalize_join_worker, mwl8k_finalize_join_worker);

      /* TX reclaim tasklet */
      tasklet_init(&priv->tx_reclaim_task,
                  mwl8k_tx_reclaim_handler, (unsigned long)hw);
      tasklet_disable(&priv->tx_reclaim_task);

      /* Config workthread */
      priv->config_wq = create_singlethread_workqueue("mwl8k_config");
      if (priv->config_wq == NULL)
            goto err_iounmap;

      /* Power management cookie */
      priv->cookie = pci_alloc_consistent(priv->pdev, 4, &priv->cookie_dma);
      if (priv->cookie == NULL)
            goto err_iounmap;

      rc = mwl8k_rxq_init(hw, 0);
      if (rc)
            goto err_iounmap;
      rxq_refill(hw, 0, INT_MAX);

      spin_lock_init(&priv->tx_lock);

      for (i = 0; i < MWL8K_TX_QUEUES; i++) {
            rc = mwl8k_txq_init(hw, i);
            if (rc)
                  goto err_free_queues;
      }

      iowrite32(0, priv->regs + MWL8K_HIU_A2H_INTERRUPT_STATUS);
      priv->int_mask = 0;
      iowrite32(priv->int_mask, priv->regs + MWL8K_HIU_A2H_INTERRUPT_MASK);
      iowrite32(0, priv->regs + MWL8K_HIU_A2H_INTERRUPT_CLEAR_SEL);
      iowrite32(0xffffffff, priv->regs + MWL8K_HIU_A2H_INTERRUPT_STATUS_MASK);

      rc = request_irq(priv->pdev->irq, &mwl8k_interrupt,
                   IRQF_SHARED, MWL8K_NAME, hw);
      if (rc) {
            printk(KERN_ERR "%s: failed to register IRQ handler\n",
                   priv->name);
            goto err_free_queues;
      }

      /* Reset firmware and hardware */
      mwl8k_hw_reset(priv);

      /* Ask userland hotplug daemon for the device firmware */
      rc = mwl8k_request_firmware(priv, (u32)id->driver_data);
      if (rc) {
            printk(KERN_ERR "%s: Firmware files not found\n", priv->name);
            goto err_free_irq;
      }

      /* Load firmware into hardware */
      rc = mwl8k_load_firmware(priv);
      if (rc) {
            printk(KERN_ERR "%s: Cannot start firmware\n", priv->name);
            goto err_stop_firmware;
      }

      /* Reclaim memory once firmware is successfully loaded */
      mwl8k_release_firmware(priv);

      /*
       * Temporarily enable interrupts.  Initial firmware host
       * commands use interrupts and avoids polling.  Disable
       * interrupts when done.
       */
      priv->int_mask |= MWL8K_A2H_EVENTS;

      iowrite32(priv->int_mask, priv->regs + MWL8K_HIU_A2H_INTERRUPT_MASK);

      /* Get config data, mac addrs etc */
      rc = mwl8k_cmd_get_hw_spec(hw);
      if (rc) {
            printk(KERN_ERR "%s: Cannot initialise firmware\n", priv->name);
            goto err_stop_firmware;
      }

      /* Turn radio off */
      rc = mwl8k_cmd_802_11_radio_control(hw, MWL8K_RADIO_DISABLE);
      if (rc) {
            printk(KERN_ERR "%s: Cannot disable\n", priv->name);
            goto err_stop_firmware;
      }

      /* Disable interrupts */
      spin_lock_irq(&priv->tx_lock);
      iowrite32(0, priv->regs + MWL8K_HIU_A2H_INTERRUPT_MASK);
      spin_unlock_irq(&priv->tx_lock);
      free_irq(priv->pdev->irq, hw);

      rc = ieee80211_register_hw(hw);
      if (rc) {
            printk(KERN_ERR "%s: Cannot register device\n", priv->name);
            goto err_stop_firmware;
      }

      fw = (u8 *)&priv->fw_rev;
      printk(KERN_INFO "%s: 88W%u %s\n", priv->name, priv->part_num,
            MWL8K_DESC);
      printk(KERN_INFO "%s: Driver Ver:%s  Firmware Ver:%u.%u.%u.%u\n",
            priv->name, MWL8K_VERSION, fw[3], fw[2], fw[1], fw[0]);
      printk(KERN_INFO "%s: MAC Address: %s\n", priv->name,
             print_mac(mac, hw->wiphy->perm_addr));

      return 0;

err_stop_firmware:
      mwl8k_hw_reset(priv);
      mwl8k_release_firmware(priv);

err_free_irq:
      spin_lock_irq(&priv->tx_lock);
      iowrite32(0, priv->regs + MWL8K_HIU_A2H_INTERRUPT_MASK);
      spin_unlock_irq(&priv->tx_lock);
      free_irq(priv->pdev->irq, hw);

err_free_queues:
      for (i = 0; i < MWL8K_TX_QUEUES; i++)
            mwl8k_txq_deinit(hw, i);
      mwl8k_rxq_deinit(hw, 0);

err_iounmap:
      if (priv->cookie != NULL)
            pci_free_consistent(priv->pdev, 4,
                        priv->cookie, priv->cookie_dma);

      if (priv->regs != NULL)
            pci_iounmap(pdev, priv->regs);

      if (priv->config_wq != NULL)
            destroy_workqueue(priv->config_wq);

      pci_set_drvdata(pdev, NULL);
      ieee80211_free_hw(hw);

err_free_reg:
      pci_release_regions(pdev);
      pci_disable_device(pdev);

      return rc;
}

static void __devexit mwl8k_shutdown(struct pci_dev *pdev)
{
      printk(KERN_ERR "===>%s(%u)\n", __func__, __LINE__);
}

static void __devexit mwl8k_remove(struct pci_dev *pdev)
{
      struct ieee80211_hw *hw = pci_get_drvdata(pdev);
      struct mwl8k_priv *priv;
      int i;

      if (hw == NULL)
            return;
      priv = hw->priv;

      ieee80211_stop_queues(hw);

      ieee80211_unregister_hw(hw);

      /* Remove tx reclaim tasklet */
      tasklet_kill(&priv->tx_reclaim_task);

      /* Stop config thread */
      destroy_workqueue(priv->config_wq);

      /* Stop hardware */
      mwl8k_hw_reset(priv);

      /* Return all skbs to mac80211 */
      for (i = 0; i < MWL8K_TX_QUEUES; i++)
            mwl8k_txq_reclaim(hw, i, 1);

      for (i = 0; i < MWL8K_TX_QUEUES; i++)
            mwl8k_txq_deinit(hw, i);

      mwl8k_rxq_deinit(hw, 0);

      pci_free_consistent(priv->pdev, 4,
                        priv->cookie, priv->cookie_dma);

      pci_iounmap(pdev, priv->regs);
      pci_set_drvdata(pdev, NULL);
      ieee80211_free_hw(hw);
      pci_release_regions(pdev);
      pci_disable_device(pdev);
}

static struct pci_driver mwl8k_driver = {
      .name       = MWL8K_NAME,
      .id_table   = mwl8k_table,
      .probe            = mwl8k_probe,
      .remove           = __devexit_p(mwl8k_remove),
      .shutdown   = __devexit_p(mwl8k_shutdown),
};

static int __init mwl8k_init(void)
{
      return pci_register_driver(&mwl8k_driver);
}

static void __exit mwl8k_exit(void)
{
      pci_unregister_driver(&mwl8k_driver);
}

module_init(mwl8k_init);
module_exit(mwl8k_exit);

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