Logo Search packages:      
Sourcecode: linux-fsl-imx51 version File versions  Download package

iwl-agn.c

/******************************************************************************
 *
 * Copyright(c) 2003 - 2009 Intel Corporation. All rights reserved.
 *
 * Portions of this file are derived from the ipw3945 project, as well
 * as portions of the ieee80211 subsystem header files.
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of version 2 of the GNU General Public License as
 * published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
 * more details.
 *
 * You should have received a copy of the GNU General Public License along with
 * this program; if not, write to the Free Software Foundation, Inc.,
 * 51 Franklin Street, Fifth Floor, Boston, MA 02110, USA
 *
 * The full GNU General Public License is included in this distribution in the
 * file called LICENSE.
 *
 * Contact Information:
 *  Intel Linux Wireless <ilw@linux.intel.com>
 * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
 *
 *****************************************************************************/

#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/pci.h>
#include <linux/dma-mapping.h>
#include <linux/delay.h>
#include <linux/skbuff.h>
#include <linux/netdevice.h>
#include <linux/wireless.h>
#include <linux/firmware.h>
#include <linux/etherdevice.h>
#include <linux/if_arp.h>

#include <net/mac80211.h>

#include <asm/div64.h>

#define DRV_NAME        "iwlagn"

#include "iwl-eeprom.h"
#include "iwl-dev.h"
#include "iwl-core.h"
#include "iwl-io.h"
#include "iwl-helpers.h"
#include "iwl-sta.h"
#include "iwl-calib.h"


/******************************************************************************
 *
 * module boiler plate
 *
 ******************************************************************************/

/*
 * module name, copyright, version, etc.
 */
#define DRV_DESCRIPTION "Intel(R) Wireless WiFi Link AGN driver for Linux"

#ifdef CONFIG_IWLWIFI_DEBUG
#define VD "d"
#else
#define VD
#endif

#ifdef CONFIG_IWLWIFI_SPECTRUM_MEASUREMENT
#define VS "s"
#else
#define VS
#endif

#define DRV_VERSION     IWLWIFI_VERSION VD VS


MODULE_DESCRIPTION(DRV_DESCRIPTION);
MODULE_VERSION(DRV_VERSION);
MODULE_AUTHOR(DRV_COPYRIGHT " " DRV_AUTHOR);
MODULE_LICENSE("GPL");
MODULE_ALIAS("iwl4965");

/*************** STATION TABLE MANAGEMENT ****
 * mac80211 should be examined to determine if sta_info is duplicating
 * the functionality provided here
 */

/**************************************************************/

/**
 * iwl_commit_rxon - commit staging_rxon to hardware
 *
 * The RXON command in staging_rxon is committed to the hardware and
 * the active_rxon structure is updated with the new data.  This
 * function correctly transitions out of the RXON_ASSOC_MSK state if
 * a HW tune is required based on the RXON structure changes.
 */
int iwl_commit_rxon(struct iwl_priv *priv)
{
      /* cast away the const for active_rxon in this function */
      struct iwl_rxon_cmd *active_rxon = (void *)&priv->active_rxon;
      int ret;
      bool new_assoc =
            !!(priv->staging_rxon.filter_flags & RXON_FILTER_ASSOC_MSK);

      if (!iwl_is_alive(priv))
            return -EBUSY;

      /* always get timestamp with Rx frame */
      priv->staging_rxon.flags |= RXON_FLG_TSF2HOST_MSK;
      /* allow CTS-to-self if possible. this is relevant only for
       * 5000, but will not damage 4965 */
      priv->staging_rxon.flags |= RXON_FLG_SELF_CTS_EN;

      ret = iwl_check_rxon_cmd(priv);
      if (ret) {
            IWL_ERR(priv, "Invalid RXON configuration.  Not committing.\n");
            return -EINVAL;
      }

      /* If we don't need to send a full RXON, we can use
       * iwl_rxon_assoc_cmd which is used to reconfigure filter
       * and other flags for the current radio configuration. */
      if (!iwl_full_rxon_required(priv)) {
            ret = iwl_send_rxon_assoc(priv);
            if (ret) {
                  IWL_ERR(priv, "Error setting RXON_ASSOC (%d)\n", ret);
                  return ret;
            }

            memcpy(active_rxon, &priv->staging_rxon, sizeof(*active_rxon));
            return 0;
      }

      /* station table will be cleared */
      priv->assoc_station_added = 0;

      /* If we are currently associated and the new config requires
       * an RXON_ASSOC and the new config wants the associated mask enabled,
       * we must clear the associated from the active configuration
       * before we apply the new config */
      if (iwl_is_associated(priv) && new_assoc) {
            IWL_DEBUG_INFO(priv, "Toggling associated bit on current RXON\n");
            active_rxon->filter_flags &= ~RXON_FILTER_ASSOC_MSK;

            ret = iwl_send_cmd_pdu(priv, REPLY_RXON,
                              sizeof(struct iwl_rxon_cmd),
                              &priv->active_rxon);

            /* If the mask clearing failed then we set
             * active_rxon back to what it was previously */
            if (ret) {
                  active_rxon->filter_flags |= RXON_FILTER_ASSOC_MSK;
                  IWL_ERR(priv, "Error clearing ASSOC_MSK (%d)\n", ret);
                  return ret;
            }
      }

      IWL_DEBUG_INFO(priv, "Sending RXON\n"
                   "* with%s RXON_FILTER_ASSOC_MSK\n"
                   "* channel = %d\n"
                   "* bssid = %pM\n",
                   (new_assoc ? "" : "out"),
                   le16_to_cpu(priv->staging_rxon.channel),
                   priv->staging_rxon.bssid_addr);

      iwl_set_rxon_hwcrypto(priv, !priv->hw_params.sw_crypto);

      /* Apply the new configuration
       * RXON unassoc clears the station table in uCode, send it before
       * we add the bcast station. If assoc bit is set, we will send RXON
       * after having added the bcast and bssid station.
       */
      if (!new_assoc) {
            ret = iwl_send_cmd_pdu(priv, REPLY_RXON,
                        sizeof(struct iwl_rxon_cmd), &priv->staging_rxon);
            if (ret) {
                  IWL_ERR(priv, "Error setting new RXON (%d)\n", ret);
                  return ret;
            }
            memcpy(active_rxon, &priv->staging_rxon, sizeof(*active_rxon));
      }

      iwl_clear_stations_table(priv);

      priv->start_calib = 0;

      /* Add the broadcast address so we can send broadcast frames */
      if (iwl_rxon_add_station(priv, iwl_bcast_addr, 0) ==
                                    IWL_INVALID_STATION) {
            IWL_ERR(priv, "Error adding BROADCAST address for transmit.\n");
            return -EIO;
      }

      /* If we have set the ASSOC_MSK and we are in BSS mode then
       * add the IWL_AP_ID to the station rate table */
      if (new_assoc) {
            if (priv->iw_mode == NL80211_IFTYPE_STATION) {
                  ret = iwl_rxon_add_station(priv,
                                 priv->active_rxon.bssid_addr, 1);
                  if (ret == IWL_INVALID_STATION) {
                        IWL_ERR(priv,
                              "Error adding AP address for TX.\n");
                        return -EIO;
                  }
                  priv->assoc_station_added = 1;
                  if (priv->default_wep_key &&
                      iwl_send_static_wepkey_cmd(priv, 0))
                        IWL_ERR(priv,
                              "Could not send WEP static key.\n");
            }

            /* Apply the new configuration
             * RXON assoc doesn't clear the station table in uCode,
             */
            ret = iwl_send_cmd_pdu(priv, REPLY_RXON,
                        sizeof(struct iwl_rxon_cmd), &priv->staging_rxon);
            if (ret) {
                  IWL_ERR(priv, "Error setting new RXON (%d)\n", ret);
                  return ret;
            }
            memcpy(active_rxon, &priv->staging_rxon, sizeof(*active_rxon));
      }

      iwl_init_sensitivity(priv);

      /* If we issue a new RXON command which required a tune then we must
       * send a new TXPOWER command or we won't be able to Tx any frames */
      ret = iwl_set_tx_power(priv, priv->tx_power_user_lmt, true);
      if (ret) {
            IWL_ERR(priv, "Error sending TX power (%d)\n", ret);
            return ret;
      }

      return 0;
}

void iwl_update_chain_flags(struct iwl_priv *priv)
{

      if (priv->cfg->ops->hcmd->set_rxon_chain)
            priv->cfg->ops->hcmd->set_rxon_chain(priv);
      iwlcore_commit_rxon(priv);
}

static void iwl_clear_free_frames(struct iwl_priv *priv)
{
      struct list_head *element;

      IWL_DEBUG_INFO(priv, "%d frames on pre-allocated heap on clear.\n",
                   priv->frames_count);

      while (!list_empty(&priv->free_frames)) {
            element = priv->free_frames.next;
            list_del(element);
            kfree(list_entry(element, struct iwl_frame, list));
            priv->frames_count--;
      }

      if (priv->frames_count) {
            IWL_WARN(priv, "%d frames still in use.  Did we lose one?\n",
                      priv->frames_count);
            priv->frames_count = 0;
      }
}

static struct iwl_frame *iwl_get_free_frame(struct iwl_priv *priv)
{
      struct iwl_frame *frame;
      struct list_head *element;
      if (list_empty(&priv->free_frames)) {
            frame = kzalloc(sizeof(*frame), GFP_KERNEL);
            if (!frame) {
                  IWL_ERR(priv, "Could not allocate frame!\n");
                  return NULL;
            }

            priv->frames_count++;
            return frame;
      }

      element = priv->free_frames.next;
      list_del(element);
      return list_entry(element, struct iwl_frame, list);
}

static void iwl_free_frame(struct iwl_priv *priv, struct iwl_frame *frame)
{
      memset(frame, 0, sizeof(*frame));
      list_add(&frame->list, &priv->free_frames);
}

static unsigned int iwl_fill_beacon_frame(struct iwl_priv *priv,
                                struct ieee80211_hdr *hdr,
                                int left)
{
      if (!iwl_is_associated(priv) || !priv->ibss_beacon ||
          ((priv->iw_mode != NL80211_IFTYPE_ADHOC) &&
           (priv->iw_mode != NL80211_IFTYPE_AP)))
            return 0;

      if (priv->ibss_beacon->len > left)
            return 0;

      memcpy(hdr, priv->ibss_beacon->data, priv->ibss_beacon->len);

      return priv->ibss_beacon->len;
}

static unsigned int iwl_hw_get_beacon_cmd(struct iwl_priv *priv,
                               struct iwl_frame *frame, u8 rate)
{
      struct iwl_tx_beacon_cmd *tx_beacon_cmd;
      unsigned int frame_size;

      tx_beacon_cmd = &frame->u.beacon;
      memset(tx_beacon_cmd, 0, sizeof(*tx_beacon_cmd));

      tx_beacon_cmd->tx.sta_id = priv->hw_params.bcast_sta_id;
      tx_beacon_cmd->tx.stop_time.life_time = TX_CMD_LIFE_TIME_INFINITE;

      frame_size = iwl_fill_beacon_frame(priv, tx_beacon_cmd->frame,
                        sizeof(frame->u) - sizeof(*tx_beacon_cmd));

      BUG_ON(frame_size > MAX_MPDU_SIZE);
      tx_beacon_cmd->tx.len = cpu_to_le16((u16)frame_size);

      if ((rate == IWL_RATE_1M_PLCP) || (rate >= IWL_RATE_2M_PLCP))
            tx_beacon_cmd->tx.rate_n_flags =
                  iwl_hw_set_rate_n_flags(rate, RATE_MCS_CCK_MSK);
      else
            tx_beacon_cmd->tx.rate_n_flags =
                  iwl_hw_set_rate_n_flags(rate, 0);

      tx_beacon_cmd->tx.tx_flags = TX_CMD_FLG_SEQ_CTL_MSK |
                             TX_CMD_FLG_TSF_MSK |
                             TX_CMD_FLG_STA_RATE_MSK;

      return sizeof(*tx_beacon_cmd) + frame_size;
}
static int iwl_send_beacon_cmd(struct iwl_priv *priv)
{
      struct iwl_frame *frame;
      unsigned int frame_size;
      int rc;
      u8 rate;

      frame = iwl_get_free_frame(priv);

      if (!frame) {
            IWL_ERR(priv, "Could not obtain free frame buffer for beacon "
                    "command.\n");
            return -ENOMEM;
      }

      rate = iwl_rate_get_lowest_plcp(priv);

      frame_size = iwl_hw_get_beacon_cmd(priv, frame, rate);

      rc = iwl_send_cmd_pdu(priv, REPLY_TX_BEACON, frame_size,
                        &frame->u.cmd[0]);

      iwl_free_frame(priv, frame);

      return rc;
}

static inline dma_addr_t iwl_tfd_tb_get_addr(struct iwl_tfd *tfd, u8 idx)
{
      struct iwl_tfd_tb *tb = &tfd->tbs[idx];

      dma_addr_t addr = get_unaligned_le32(&tb->lo);
      if (sizeof(dma_addr_t) > sizeof(u32))
            addr |=
            ((dma_addr_t)(le16_to_cpu(tb->hi_n_len) & 0xF) << 16) << 16;

      return addr;
}

static inline u16 iwl_tfd_tb_get_len(struct iwl_tfd *tfd, u8 idx)
{
      struct iwl_tfd_tb *tb = &tfd->tbs[idx];

      return le16_to_cpu(tb->hi_n_len) >> 4;
}

static inline void iwl_tfd_set_tb(struct iwl_tfd *tfd, u8 idx,
                          dma_addr_t addr, u16 len)
{
      struct iwl_tfd_tb *tb = &tfd->tbs[idx];
      u16 hi_n_len = len << 4;

      put_unaligned_le32(addr, &tb->lo);
      if (sizeof(dma_addr_t) > sizeof(u32))
            hi_n_len |= ((addr >> 16) >> 16) & 0xF;

      tb->hi_n_len = cpu_to_le16(hi_n_len);

      tfd->num_tbs = idx + 1;
}

static inline u8 iwl_tfd_get_num_tbs(struct iwl_tfd *tfd)
{
      return tfd->num_tbs & 0x1f;
}

/**
 * iwl_hw_txq_free_tfd - Free all chunks referenced by TFD [txq->q.read_ptr]
 * @priv - driver private data
 * @txq - tx queue
 *
 * Does NOT advance any TFD circular buffer read/write indexes
 * Does NOT free the TFD itself (which is within circular buffer)
 */
void iwl_hw_txq_free_tfd(struct iwl_priv *priv, struct iwl_tx_queue *txq)
{
      struct iwl_tfd *tfd_tmp = (struct iwl_tfd *)txq->tfds;
      struct iwl_tfd *tfd;
      struct pci_dev *dev = priv->pci_dev;
      int index = txq->q.read_ptr;
      int i;
      int num_tbs;

      tfd = &tfd_tmp[index];

      /* Sanity check on number of chunks */
      num_tbs = iwl_tfd_get_num_tbs(tfd);

      if (num_tbs >= IWL_NUM_OF_TBS) {
            IWL_ERR(priv, "Too many chunks: %i\n", num_tbs);
            /* @todo issue fatal error, it is quite serious situation */
            return;
      }

      /* Unmap tx_cmd */
      if (num_tbs)
            pci_unmap_single(dev,
                        pci_unmap_addr(&txq->cmd[index]->meta, mapping),
                        pci_unmap_len(&txq->cmd[index]->meta, len),
                        PCI_DMA_BIDIRECTIONAL);

      /* Unmap chunks, if any. */
      for (i = 1; i < num_tbs; i++) {
            pci_unmap_single(dev, iwl_tfd_tb_get_addr(tfd, i),
                        iwl_tfd_tb_get_len(tfd, i), PCI_DMA_TODEVICE);

            if (txq->txb) {
                  dev_kfree_skb(txq->txb[txq->q.read_ptr].skb[i - 1]);
                  txq->txb[txq->q.read_ptr].skb[i - 1] = NULL;
            }
      }
}

int iwl_hw_txq_attach_buf_to_tfd(struct iwl_priv *priv,
                         struct iwl_tx_queue *txq,
                         dma_addr_t addr, u16 len,
                         u8 reset, u8 pad)
{
      struct iwl_queue *q;
      struct iwl_tfd *tfd, *tfd_tmp;
      u32 num_tbs;

      q = &txq->q;
      tfd_tmp = (struct iwl_tfd *)txq->tfds;
      tfd = &tfd_tmp[q->write_ptr];

      if (reset)
            memset(tfd, 0, sizeof(*tfd));

      num_tbs = iwl_tfd_get_num_tbs(tfd);

      /* Each TFD can point to a maximum 20 Tx buffers */
      if (num_tbs >= IWL_NUM_OF_TBS) {
            IWL_ERR(priv, "Error can not send more than %d chunks\n",
                    IWL_NUM_OF_TBS);
            return -EINVAL;
      }

      BUG_ON(addr & ~DMA_BIT_MASK(36));
      if (unlikely(addr & ~IWL_TX_DMA_MASK))
            IWL_ERR(priv, "Unaligned address = %llx\n",
                    (unsigned long long)addr);

      iwl_tfd_set_tb(tfd, num_tbs, addr, len);

      return 0;
}

/*
 * Tell nic where to find circular buffer of Tx Frame Descriptors for
 * given Tx queue, and enable the DMA channel used for that queue.
 *
 * 4965 supports up to 16 Tx queues in DRAM, mapped to up to 8 Tx DMA
 * channels supported in hardware.
 */
int iwl_hw_tx_queue_init(struct iwl_priv *priv,
                   struct iwl_tx_queue *txq)
{
      int txq_id = txq->q.id;

      /* Circular buffer (TFD queue in DRAM) physical base address */
      iwl_write_direct32(priv, FH_MEM_CBBC_QUEUE(txq_id),
                       txq->q.dma_addr >> 8);

      return 0;
}


/******************************************************************************
 *
 * Misc. internal state and helper functions
 *
 ******************************************************************************/

#define MAX_UCODE_BEACON_INTERVAL   4096

static u16 iwl_adjust_beacon_interval(u16 beacon_val)
{
      u16 new_val = 0;
      u16 beacon_factor = 0;

      beacon_factor = (beacon_val + MAX_UCODE_BEACON_INTERVAL)
                              / MAX_UCODE_BEACON_INTERVAL;
      new_val = beacon_val / beacon_factor;

      if (!new_val)
            new_val = MAX_UCODE_BEACON_INTERVAL;

      return new_val;
}

static void iwl_setup_rxon_timing(struct iwl_priv *priv)
{
      u64 tsf;
      s32 interval_tm, rem;
      unsigned long flags;
      struct ieee80211_conf *conf = NULL;
      u16 beacon_int = 0;

      conf = ieee80211_get_hw_conf(priv->hw);

      spin_lock_irqsave(&priv->lock, flags);
      priv->rxon_timing.timestamp = cpu_to_le64(priv->timestamp);
      priv->rxon_timing.listen_interval = cpu_to_le16(conf->listen_interval);

      if (priv->iw_mode == NL80211_IFTYPE_STATION) {
            beacon_int = iwl_adjust_beacon_interval(priv->beacon_int);
            priv->rxon_timing.atim_window = 0;
      } else {
            beacon_int = iwl_adjust_beacon_interval(
                  priv->vif->bss_conf.beacon_int);

            /* TODO: we need to get atim_window from upper stack
             * for now we set to 0 */
            priv->rxon_timing.atim_window = 0;
      }

      priv->rxon_timing.beacon_interval = cpu_to_le16(beacon_int);

      tsf = priv->timestamp; /* tsf is modifed by do_div: copy it */
      interval_tm = beacon_int * 1024;
      rem = do_div(tsf, interval_tm);
      priv->rxon_timing.beacon_init_val = cpu_to_le32(interval_tm - rem);

      spin_unlock_irqrestore(&priv->lock, flags);
      IWL_DEBUG_ASSOC(priv, "beacon interval %d beacon timer %d beacon tim %d\n",
                  le16_to_cpu(priv->rxon_timing.beacon_interval),
                  le32_to_cpu(priv->rxon_timing.beacon_init_val),
                  le16_to_cpu(priv->rxon_timing.atim_window));
}

/******************************************************************************
 *
 * Generic RX handler implementations
 *
 ******************************************************************************/
static void iwl_rx_reply_alive(struct iwl_priv *priv,
                        struct iwl_rx_mem_buffer *rxb)
{
      struct iwl_rx_packet *pkt = (struct iwl_rx_packet *)rxb->skb->data;
      struct iwl_alive_resp *palive;
      struct delayed_work *pwork;

      palive = &pkt->u.alive_frame;

      IWL_DEBUG_INFO(priv, "Alive ucode status 0x%08X revision "
                   "0x%01X 0x%01X\n",
                   palive->is_valid, palive->ver_type,
                   palive->ver_subtype);

      if (palive->ver_subtype == INITIALIZE_SUBTYPE) {
            IWL_DEBUG_INFO(priv, "Initialization Alive received.\n");
            memcpy(&priv->card_alive_init,
                   &pkt->u.alive_frame,
                   sizeof(struct iwl_init_alive_resp));
            pwork = &priv->init_alive_start;
      } else {
            IWL_DEBUG_INFO(priv, "Runtime Alive received.\n");
            memcpy(&priv->card_alive, &pkt->u.alive_frame,
                   sizeof(struct iwl_alive_resp));
            pwork = &priv->alive_start;
      }

      /* We delay the ALIVE response by 5ms to
       * give the HW RF Kill time to activate... */
      if (palive->is_valid == UCODE_VALID_OK)
            queue_delayed_work(priv->workqueue, pwork,
                           msecs_to_jiffies(5));
      else
            IWL_WARN(priv, "uCode did not respond OK.\n");
}

static void iwl_bg_beacon_update(struct work_struct *work)
{
      struct iwl_priv *priv =
            container_of(work, struct iwl_priv, beacon_update);
      struct sk_buff *beacon;

      /* Pull updated AP beacon from mac80211. will fail if not in AP mode */
      beacon = ieee80211_beacon_get(priv->hw, priv->vif);

      if (!beacon) {
            IWL_ERR(priv, "update beacon failed\n");
            return;
      }

      mutex_lock(&priv->mutex);
      /* new beacon skb is allocated every time; dispose previous.*/
      if (priv->ibss_beacon)
            dev_kfree_skb(priv->ibss_beacon);

      priv->ibss_beacon = beacon;
      mutex_unlock(&priv->mutex);

      iwl_send_beacon_cmd(priv);
}

/**
 * iwl_bg_statistics_periodic - Timer callback to queue statistics
 *
 * This callback is provided in order to send a statistics request.
 *
 * This timer function is continually reset to execute within
 * REG_RECALIB_PERIOD seconds since the last STATISTICS_NOTIFICATION
 * was received.  We need to ensure we receive the statistics in order
 * to update the temperature used for calibrating the TXPOWER.
 */
static void iwl_bg_statistics_periodic(unsigned long data)
{
      struct iwl_priv *priv = (struct iwl_priv *)data;

      if (test_bit(STATUS_EXIT_PENDING, &priv->status))
            return;

      /* dont send host command if rf-kill is on */
      if (!iwl_is_ready_rf(priv))
            return;

      iwl_send_statistics_request(priv, CMD_ASYNC);
}

static void iwl_rx_beacon_notif(struct iwl_priv *priv,
                        struct iwl_rx_mem_buffer *rxb)
{
#ifdef CONFIG_IWLWIFI_DEBUG
      struct iwl_rx_packet *pkt = (struct iwl_rx_packet *)rxb->skb->data;
      struct iwl4965_beacon_notif *beacon =
            (struct iwl4965_beacon_notif *)pkt->u.raw;
      u8 rate = iwl_hw_get_rate(beacon->beacon_notify_hdr.rate_n_flags);

      IWL_DEBUG_RX(priv, "beacon status %x retries %d iss %d "
            "tsf %d %d rate %d\n",
            le32_to_cpu(beacon->beacon_notify_hdr.u.status) & TX_STATUS_MSK,
            beacon->beacon_notify_hdr.failure_frame,
            le32_to_cpu(beacon->ibss_mgr_status),
            le32_to_cpu(beacon->high_tsf),
            le32_to_cpu(beacon->low_tsf), rate);
#endif

      if ((priv->iw_mode == NL80211_IFTYPE_AP) &&
          (!test_bit(STATUS_EXIT_PENDING, &priv->status)))
            queue_work(priv->workqueue, &priv->beacon_update);
}

/* Handle notification from uCode that card's power state is changing
 * due to software, hardware, or critical temperature RFKILL */
static void iwl_rx_card_state_notif(struct iwl_priv *priv,
                            struct iwl_rx_mem_buffer *rxb)
{
      struct iwl_rx_packet *pkt = (struct iwl_rx_packet *)rxb->skb->data;
      u32 flags = le32_to_cpu(pkt->u.card_state_notif.flags);
      unsigned long status = priv->status;
      unsigned long reg_flags;

      IWL_DEBUG_RF_KILL(priv, "Card state received: HW:%s SW:%s\n",
                    (flags & HW_CARD_DISABLED) ? "Kill" : "On",
                    (flags & SW_CARD_DISABLED) ? "Kill" : "On");

      if (flags & (SW_CARD_DISABLED | HW_CARD_DISABLED |
                 RF_CARD_DISABLED)) {

            iwl_write32(priv, CSR_UCODE_DRV_GP1_SET,
                      CSR_UCODE_DRV_GP1_BIT_CMD_BLOCKED);

            iwl_write_direct32(priv, HBUS_TARG_MBX_C,
                              HBUS_TARG_MBX_C_REG_BIT_CMD_BLOCKED);

            if (!(flags & RXON_CARD_DISABLED)) {
                  iwl_write32(priv, CSR_UCODE_DRV_GP1_CLR,
                            CSR_UCODE_DRV_GP1_BIT_CMD_BLOCKED);
                  iwl_write_direct32(priv, HBUS_TARG_MBX_C,
                              HBUS_TARG_MBX_C_REG_BIT_CMD_BLOCKED);

            }

            if (flags & RF_CARD_DISABLED) {
                  iwl_write32(priv, CSR_UCODE_DRV_GP1_SET,
                            CSR_UCODE_DRV_GP1_REG_BIT_CT_KILL_EXIT);
                  iwl_read32(priv, CSR_UCODE_DRV_GP1);
                  spin_lock_irqsave(&priv->reg_lock, reg_flags);
                  if (!iwl_grab_nic_access(priv))
                        iwl_release_nic_access(priv);
                  spin_unlock_irqrestore(&priv->reg_lock, reg_flags);
            }
      }

      if (flags & HW_CARD_DISABLED)
            set_bit(STATUS_RF_KILL_HW, &priv->status);
      else
            clear_bit(STATUS_RF_KILL_HW, &priv->status);


      if (!(flags & RXON_CARD_DISABLED))
            iwl_scan_cancel(priv);

      if ((test_bit(STATUS_RF_KILL_HW, &status) !=
           test_bit(STATUS_RF_KILL_HW, &priv->status)))
            wiphy_rfkill_set_hw_state(priv->hw->wiphy,
                  test_bit(STATUS_RF_KILL_HW, &priv->status));
      else
            wake_up_interruptible(&priv->wait_command_queue);
}

int iwl_set_pwr_src(struct iwl_priv *priv, enum iwl_pwr_src src)
{
      if (src == IWL_PWR_SRC_VAUX) {
            if (pci_pme_capable(priv->pci_dev, PCI_D3cold))
                  iwl_set_bits_mask_prph(priv, APMG_PS_CTRL_REG,
                                     APMG_PS_CTRL_VAL_PWR_SRC_VAUX,
                                     ~APMG_PS_CTRL_MSK_PWR_SRC);
      } else {
            iwl_set_bits_mask_prph(priv, APMG_PS_CTRL_REG,
                               APMG_PS_CTRL_VAL_PWR_SRC_VMAIN,
                               ~APMG_PS_CTRL_MSK_PWR_SRC);
      }

      return 0;
}

/**
 * iwl_setup_rx_handlers - Initialize Rx handler callbacks
 *
 * Setup the RX handlers for each of the reply types sent from the uCode
 * to the host.
 *
 * This function chains into the hardware specific files for them to setup
 * any hardware specific handlers as well.
 */
static void iwl_setup_rx_handlers(struct iwl_priv *priv)
{
      priv->rx_handlers[REPLY_ALIVE] = iwl_rx_reply_alive;
      priv->rx_handlers[REPLY_ERROR] = iwl_rx_reply_error;
      priv->rx_handlers[CHANNEL_SWITCH_NOTIFICATION] = iwl_rx_csa;
      priv->rx_handlers[PM_SLEEP_NOTIFICATION] = iwl_rx_pm_sleep_notif;
      priv->rx_handlers[PM_DEBUG_STATISTIC_NOTIFIC] =
          iwl_rx_pm_debug_statistics_notif;
      priv->rx_handlers[BEACON_NOTIFICATION] = iwl_rx_beacon_notif;

      /*
       * The same handler is used for both the REPLY to a discrete
       * statistics request from the host as well as for the periodic
       * statistics notifications (after received beacons) from the uCode.
       */
      priv->rx_handlers[REPLY_STATISTICS_CMD] = iwl_rx_statistics;
      priv->rx_handlers[STATISTICS_NOTIFICATION] = iwl_rx_statistics;

      iwl_setup_spectrum_handlers(priv);
      iwl_setup_rx_scan_handlers(priv);

      /* status change handler */
      priv->rx_handlers[CARD_STATE_NOTIFICATION] = iwl_rx_card_state_notif;

      priv->rx_handlers[MISSED_BEACONS_NOTIFICATION] =
          iwl_rx_missed_beacon_notif;
      /* Rx handlers */
      priv->rx_handlers[REPLY_RX_PHY_CMD] = iwl_rx_reply_rx_phy;
      priv->rx_handlers[REPLY_RX_MPDU_CMD] = iwl_rx_reply_rx;
      /* block ack */
      priv->rx_handlers[REPLY_COMPRESSED_BA] = iwl_rx_reply_compressed_ba;
      /* Set up hardware specific Rx handlers */
      priv->cfg->ops->lib->rx_handler_setup(priv);
}

/**
 * iwl_rx_handle - Main entry function for receiving responses from uCode
 *
 * Uses the priv->rx_handlers callback function array to invoke
 * the appropriate handlers, including command responses,
 * frame-received notifications, and other notifications.
 */
void iwl_rx_handle(struct iwl_priv *priv)
{
      struct iwl_rx_mem_buffer *rxb;
      struct iwl_rx_packet *pkt;
      struct iwl_rx_queue *rxq = &priv->rxq;
      u32 r, i;
      int reclaim;
      unsigned long flags;
      u8 fill_rx = 0;
      u32 count = 8;
      int total_empty;

      /* uCode's read index (stored in shared DRAM) indicates the last Rx
       * buffer that the driver may process (last buffer filled by ucode). */
      r = le16_to_cpu(rxq->rb_stts->closed_rb_num) &  0x0FFF;
      i = rxq->read;

      /* Rx interrupt, but nothing sent from uCode */
      if (i == r)
            IWL_DEBUG_RX(priv, "r = %d, i = %d\n", r, i);

      /* calculate total frames need to be restock after handling RX */
      total_empty = r - priv->rxq.write_actual;
      if (total_empty < 0)
            total_empty += RX_QUEUE_SIZE;

      if (total_empty > (RX_QUEUE_SIZE / 2))
            fill_rx = 1;

      while (i != r) {
            rxb = rxq->queue[i];

            /* If an RXB doesn't have a Rx queue slot associated with it,
             * then a bug has been introduced in the queue refilling
             * routines -- catch it here */
            BUG_ON(rxb == NULL);

            rxq->queue[i] = NULL;

            pci_unmap_single(priv->pci_dev, rxb->real_dma_addr,
                         priv->hw_params.rx_buf_size + 256,
                         PCI_DMA_FROMDEVICE);
            pkt = (struct iwl_rx_packet *)rxb->skb->data;

            /* Reclaim a command buffer only if this packet is a response
             *   to a (driver-originated) command.
             * If the packet (e.g. Rx frame) originated from uCode,
             *   there is no command buffer to reclaim.
             * Ucode should set SEQ_RX_FRAME bit if ucode-originated,
             *   but apparently a few don't get set; catch them here. */
            reclaim = !(pkt->hdr.sequence & SEQ_RX_FRAME) &&
                  (pkt->hdr.cmd != REPLY_RX_PHY_CMD) &&
                  (pkt->hdr.cmd != REPLY_RX) &&
                  (pkt->hdr.cmd != REPLY_RX_MPDU_CMD) &&
                  (pkt->hdr.cmd != REPLY_COMPRESSED_BA) &&
                  (pkt->hdr.cmd != STATISTICS_NOTIFICATION) &&
                  (pkt->hdr.cmd != REPLY_TX);

            /* Based on type of command response or notification,
             *   handle those that need handling via function in
             *   rx_handlers table.  See iwl_setup_rx_handlers() */
            if (priv->rx_handlers[pkt->hdr.cmd]) {
                  IWL_DEBUG_RX(priv, "r = %d, i = %d, %s, 0x%02x\n", r,
                        i, get_cmd_string(pkt->hdr.cmd), pkt->hdr.cmd);
                  priv->rx_handlers[pkt->hdr.cmd] (priv, rxb);
                  priv->isr_stats.rx_handlers[pkt->hdr.cmd]++;
            } else {
                  /* No handling needed */
                  IWL_DEBUG_RX(priv,
                        "r %d i %d No handler needed for %s, 0x%02x\n",
                        r, i, get_cmd_string(pkt->hdr.cmd),
                        pkt->hdr.cmd);
            }

            if (reclaim) {
                  /* Invoke any callbacks, transfer the skb to caller, and
                   * fire off the (possibly) blocking iwl_send_cmd()
                   * as we reclaim the driver command queue */
                  if (rxb && rxb->skb)
                        iwl_tx_cmd_complete(priv, rxb);
                  else
                        IWL_WARN(priv, "Claim null rxb?\n");
            }

            /* For now we just don't re-use anything.  We can tweak this
             * later to try and re-use notification packets and SKBs that
             * fail to Rx correctly */
            if (rxb->skb != NULL) {
                  priv->alloc_rxb_skb--;
                  dev_kfree_skb_any(rxb->skb);
                  rxb->skb = NULL;
            }

            spin_lock_irqsave(&rxq->lock, flags);
            list_add_tail(&rxb->list, &priv->rxq.rx_used);
            spin_unlock_irqrestore(&rxq->lock, flags);
            i = (i + 1) & RX_QUEUE_MASK;
            /* If there are a lot of unused frames,
             * restock the Rx queue so ucode wont assert. */
            if (fill_rx) {
                  count++;
                  if (count >= 8) {
                        priv->rxq.read = i;
                        iwl_rx_replenish_now(priv);
                        count = 0;
                  }
            }
      }

      /* Backtrack one entry */
      priv->rxq.read = i;
      if (fill_rx)
            iwl_rx_replenish_now(priv);
      else
            iwl_rx_queue_restock(priv);
}

/* call this function to flush any scheduled tasklet */
static inline void iwl_synchronize_irq(struct iwl_priv *priv)
{
      /* wait to make sure we flush pending tasklet*/
      synchronize_irq(priv->pci_dev->irq);
      tasklet_kill(&priv->irq_tasklet);
}

static void iwl_irq_tasklet_legacy(struct iwl_priv *priv)
{
      u32 inta, handled = 0;
      u32 inta_fh;
      unsigned long flags;
#ifdef CONFIG_IWLWIFI_DEBUG
      u32 inta_mask;
#endif

      spin_lock_irqsave(&priv->lock, flags);

      /* Ack/clear/reset pending uCode interrupts.
       * Note:  Some bits in CSR_INT are "OR" of bits in CSR_FH_INT_STATUS,
       *  and will clear only when CSR_FH_INT_STATUS gets cleared. */
      inta = iwl_read32(priv, CSR_INT);
      iwl_write32(priv, CSR_INT, inta);

      /* Ack/clear/reset pending flow-handler (DMA) interrupts.
       * Any new interrupts that happen after this, either while we're
       * in this tasklet, or later, will show up in next ISR/tasklet. */
      inta_fh = iwl_read32(priv, CSR_FH_INT_STATUS);
      iwl_write32(priv, CSR_FH_INT_STATUS, inta_fh);

#ifdef CONFIG_IWLWIFI_DEBUG
      if (priv->debug_level & IWL_DL_ISR) {
            /* just for debug */
            inta_mask = iwl_read32(priv, CSR_INT_MASK);
            IWL_DEBUG_ISR(priv, "inta 0x%08x, enabled 0x%08x, fh 0x%08x\n",
                        inta, inta_mask, inta_fh);
      }
#endif

      /* Since CSR_INT and CSR_FH_INT_STATUS reads and clears are not
       * atomic, make sure that inta covers all the interrupts that
       * we've discovered, even if FH interrupt came in just after
       * reading CSR_INT. */
      if (inta_fh & CSR49_FH_INT_RX_MASK)
            inta |= CSR_INT_BIT_FH_RX;
      if (inta_fh & CSR49_FH_INT_TX_MASK)
            inta |= CSR_INT_BIT_FH_TX;

      /* Now service all interrupt bits discovered above. */
      if (inta & CSR_INT_BIT_HW_ERR) {
            IWL_ERR(priv, "Microcode HW error detected.  Restarting.\n");

            /* Tell the device to stop sending interrupts */
            iwl_disable_interrupts(priv);

            priv->isr_stats.hw++;
            iwl_irq_handle_error(priv);

            handled |= CSR_INT_BIT_HW_ERR;

            spin_unlock_irqrestore(&priv->lock, flags);

            return;
      }

#ifdef CONFIG_IWLWIFI_DEBUG
      if (priv->debug_level & (IWL_DL_ISR)) {
            /* NIC fires this, but we don't use it, redundant with WAKEUP */
            if (inta & CSR_INT_BIT_SCD) {
                  IWL_DEBUG_ISR(priv, "Scheduler finished to transmit "
                              "the frame/frames.\n");
                  priv->isr_stats.sch++;
            }

            /* Alive notification via Rx interrupt will do the real work */
            if (inta & CSR_INT_BIT_ALIVE) {
                  IWL_DEBUG_ISR(priv, "Alive interrupt\n");
                  priv->isr_stats.alive++;
            }
      }
#endif
      /* Safely ignore these bits for debug checks below */
      inta &= ~(CSR_INT_BIT_SCD | CSR_INT_BIT_ALIVE);

      /* HW RF KILL switch toggled */
      if (inta & CSR_INT_BIT_RF_KILL) {
            int hw_rf_kill = 0;
            if (!(iwl_read32(priv, CSR_GP_CNTRL) &
                        CSR_GP_CNTRL_REG_FLAG_HW_RF_KILL_SW))
                  hw_rf_kill = 1;

            IWL_DEBUG_RF_KILL(priv, "RF_KILL bit toggled to %s.\n",
                        hw_rf_kill ? "disable radio" : "enable radio");

            priv->isr_stats.rfkill++;

            /* driver only loads ucode once setting the interface up.
             * the driver allows loading the ucode even if the radio
             * is killed. Hence update the killswitch state here. The
             * rfkill handler will care about restarting if needed.
             */
            if (!test_bit(STATUS_ALIVE, &priv->status)) {
                  if (hw_rf_kill)
                        set_bit(STATUS_RF_KILL_HW, &priv->status);
                  else
                        clear_bit(STATUS_RF_KILL_HW, &priv->status);
                  wiphy_rfkill_set_hw_state(priv->hw->wiphy, hw_rf_kill);
            }

            handled |= CSR_INT_BIT_RF_KILL;
      }

      /* Chip got too hot and stopped itself */
      if (inta & CSR_INT_BIT_CT_KILL) {
            IWL_ERR(priv, "Microcode CT kill error detected.\n");
            priv->isr_stats.ctkill++;
            handled |= CSR_INT_BIT_CT_KILL;
      }

      /* Error detected by uCode */
      if (inta & CSR_INT_BIT_SW_ERR) {
            IWL_ERR(priv, "Microcode SW error detected. "
                  " Restarting 0x%X.\n", inta);
            priv->isr_stats.sw++;
            priv->isr_stats.sw_err = inta;
            iwl_irq_handle_error(priv);
            handled |= CSR_INT_BIT_SW_ERR;
      }

      /* uCode wakes up after power-down sleep */
      if (inta & CSR_INT_BIT_WAKEUP) {
            IWL_DEBUG_ISR(priv, "Wakeup interrupt\n");
            iwl_rx_queue_update_write_ptr(priv, &priv->rxq);
            iwl_txq_update_write_ptr(priv, &priv->txq[0]);
            iwl_txq_update_write_ptr(priv, &priv->txq[1]);
            iwl_txq_update_write_ptr(priv, &priv->txq[2]);
            iwl_txq_update_write_ptr(priv, &priv->txq[3]);
            iwl_txq_update_write_ptr(priv, &priv->txq[4]);
            iwl_txq_update_write_ptr(priv, &priv->txq[5]);

            priv->isr_stats.wakeup++;

            handled |= CSR_INT_BIT_WAKEUP;
      }

      /* All uCode command responses, including Tx command responses,
       * Rx "responses" (frame-received notification), and other
       * notifications from uCode come through here*/
      if (inta & (CSR_INT_BIT_FH_RX | CSR_INT_BIT_SW_RX)) {
            iwl_rx_handle(priv);
            priv->isr_stats.rx++;
            handled |= (CSR_INT_BIT_FH_RX | CSR_INT_BIT_SW_RX);
      }

      if (inta & CSR_INT_BIT_FH_TX) {
            IWL_DEBUG_ISR(priv, "Tx interrupt\n");
            priv->isr_stats.tx++;
            handled |= CSR_INT_BIT_FH_TX;
            /* FH finished to write, send event */
            priv->ucode_write_complete = 1;
            wake_up_interruptible(&priv->wait_command_queue);
      }

      if (inta & ~handled) {
            IWL_ERR(priv, "Unhandled INTA bits 0x%08x\n", inta & ~handled);
            priv->isr_stats.unhandled++;
      }

      if (inta & ~(priv->inta_mask)) {
            IWL_WARN(priv, "Disabled INTA bits 0x%08x were pending\n",
                   inta & ~priv->inta_mask);
            IWL_WARN(priv, "   with FH_INT = 0x%08x\n", inta_fh);
      }

      /* Re-enable all interrupts */
      /* only Re-enable if diabled by irq */
      if (test_bit(STATUS_INT_ENABLED, &priv->status))
            iwl_enable_interrupts(priv);

#ifdef CONFIG_IWLWIFI_DEBUG
      if (priv->debug_level & (IWL_DL_ISR)) {
            inta = iwl_read32(priv, CSR_INT);
            inta_mask = iwl_read32(priv, CSR_INT_MASK);
            inta_fh = iwl_read32(priv, CSR_FH_INT_STATUS);
            IWL_DEBUG_ISR(priv, "End inta 0x%08x, enabled 0x%08x, fh 0x%08x, "
                  "flags 0x%08lx\n", inta, inta_mask, inta_fh, flags);
      }
#endif
      spin_unlock_irqrestore(&priv->lock, flags);
}

/* tasklet for iwlagn interrupt */
static void iwl_irq_tasklet(struct iwl_priv *priv)
{
      u32 inta = 0;
      u32 handled = 0;
      unsigned long flags;
#ifdef CONFIG_IWLWIFI_DEBUG
      u32 inta_mask;
#endif

      spin_lock_irqsave(&priv->lock, flags);

      /* Ack/clear/reset pending uCode interrupts.
       * Note:  Some bits in CSR_INT are "OR" of bits in CSR_FH_INT_STATUS,
       */
      iwl_write32(priv, CSR_INT, priv->inta);

      inta = priv->inta;

#ifdef CONFIG_IWLWIFI_DEBUG
      if (priv->debug_level & IWL_DL_ISR) {
            /* just for debug */
            inta_mask = iwl_read32(priv, CSR_INT_MASK);
            IWL_DEBUG_ISR(priv, "inta 0x%08x, enabled 0x%08x\n ",
                        inta, inta_mask);
      }
#endif
      /* saved interrupt in inta variable now we can reset priv->inta */
      priv->inta = 0;

      /* Now service all interrupt bits discovered above. */
      if (inta & CSR_INT_BIT_HW_ERR) {
            IWL_ERR(priv, "Microcode HW error detected.  Restarting.\n");

            /* Tell the device to stop sending interrupts */
            iwl_disable_interrupts(priv);

            priv->isr_stats.hw++;
            iwl_irq_handle_error(priv);

            handled |= CSR_INT_BIT_HW_ERR;

            spin_unlock_irqrestore(&priv->lock, flags);

            return;
      }

#ifdef CONFIG_IWLWIFI_DEBUG
      if (priv->debug_level & (IWL_DL_ISR)) {
            /* NIC fires this, but we don't use it, redundant with WAKEUP */
            if (inta & CSR_INT_BIT_SCD) {
                  IWL_DEBUG_ISR(priv, "Scheduler finished to transmit "
                              "the frame/frames.\n");
                  priv->isr_stats.sch++;
            }

            /* Alive notification via Rx interrupt will do the real work */
            if (inta & CSR_INT_BIT_ALIVE) {
                  IWL_DEBUG_ISR(priv, "Alive interrupt\n");
                  priv->isr_stats.alive++;
            }
      }
#endif
      /* Safely ignore these bits for debug checks below */
      inta &= ~(CSR_INT_BIT_SCD | CSR_INT_BIT_ALIVE);

      /* HW RF KILL switch toggled */
      if (inta & CSR_INT_BIT_RF_KILL) {
            int hw_rf_kill = 0;
            if (!(iwl_read32(priv, CSR_GP_CNTRL) &
                        CSR_GP_CNTRL_REG_FLAG_HW_RF_KILL_SW))
                  hw_rf_kill = 1;

            IWL_DEBUG_RF_KILL(priv, "RF_KILL bit toggled to %s.\n",
                        hw_rf_kill ? "disable radio" : "enable radio");

            priv->isr_stats.rfkill++;

            /* driver only loads ucode once setting the interface up.
             * the driver allows loading the ucode even if the radio
             * is killed. Hence update the killswitch state here. The
             * rfkill handler will care about restarting if needed.
             */
            if (!test_bit(STATUS_ALIVE, &priv->status)) {
                  if (hw_rf_kill)
                        set_bit(STATUS_RF_KILL_HW, &priv->status);
                  else
                        clear_bit(STATUS_RF_KILL_HW, &priv->status);
                  wiphy_rfkill_set_hw_state(priv->hw->wiphy, hw_rf_kill);
            }

            handled |= CSR_INT_BIT_RF_KILL;
      }

      /* Chip got too hot and stopped itself */
      if (inta & CSR_INT_BIT_CT_KILL) {
            IWL_ERR(priv, "Microcode CT kill error detected.\n");
            priv->isr_stats.ctkill++;
            handled |= CSR_INT_BIT_CT_KILL;
      }

      /* Error detected by uCode */
      if (inta & CSR_INT_BIT_SW_ERR) {
            IWL_ERR(priv, "Microcode SW error detected. "
                  " Restarting 0x%X.\n", inta);
            priv->isr_stats.sw++;
            priv->isr_stats.sw_err = inta;
            iwl_irq_handle_error(priv);
            handled |= CSR_INT_BIT_SW_ERR;
      }

      /* uCode wakes up after power-down sleep */
      if (inta & CSR_INT_BIT_WAKEUP) {
            IWL_DEBUG_ISR(priv, "Wakeup interrupt\n");
            iwl_rx_queue_update_write_ptr(priv, &priv->rxq);
            iwl_txq_update_write_ptr(priv, &priv->txq[0]);
            iwl_txq_update_write_ptr(priv, &priv->txq[1]);
            iwl_txq_update_write_ptr(priv, &priv->txq[2]);
            iwl_txq_update_write_ptr(priv, &priv->txq[3]);
            iwl_txq_update_write_ptr(priv, &priv->txq[4]);
            iwl_txq_update_write_ptr(priv, &priv->txq[5]);

            priv->isr_stats.wakeup++;

            handled |= CSR_INT_BIT_WAKEUP;
      }

      /* All uCode command responses, including Tx command responses,
       * Rx "responses" (frame-received notification), and other
       * notifications from uCode come through here*/
      if (inta & (CSR_INT_BIT_FH_RX | CSR_INT_BIT_SW_RX |
                  CSR_INT_BIT_RX_PERIODIC)) {
            IWL_DEBUG_ISR(priv, "Rx interrupt\n");
            if (inta & (CSR_INT_BIT_FH_RX | CSR_INT_BIT_SW_RX)) {
                  handled |= (CSR_INT_BIT_FH_RX | CSR_INT_BIT_SW_RX);
                  iwl_write32(priv, CSR_FH_INT_STATUS,
                              CSR49_FH_INT_RX_MASK);
            }
            if (inta & CSR_INT_BIT_RX_PERIODIC) {
                  handled |= CSR_INT_BIT_RX_PERIODIC;
                  iwl_write32(priv, CSR_INT, CSR_INT_BIT_RX_PERIODIC);
            }
            /* Sending RX interrupt require many steps to be done in the
             * the device:
             * 1- write interrupt to current index in ICT table.
             * 2- dma RX frame.
             * 3- update RX shared data to indicate last write index.
             * 4- send interrupt.
             * This could lead to RX race, driver could receive RX interrupt
             * but the shared data changes does not reflect this.
             * this could lead to RX race, RX periodic will solve this race
             */
            iwl_write32(priv, CSR_INT_PERIODIC_REG,
                      CSR_INT_PERIODIC_DIS);
            iwl_rx_handle(priv);
            /* Only set RX periodic if real RX is received. */
            if (inta & (CSR_INT_BIT_FH_RX | CSR_INT_BIT_SW_RX))
                  iwl_write32(priv, CSR_INT_PERIODIC_REG,
                            CSR_INT_PERIODIC_ENA);

            priv->isr_stats.rx++;
      }

      if (inta & CSR_INT_BIT_FH_TX) {
            iwl_write32(priv, CSR_FH_INT_STATUS, CSR49_FH_INT_TX_MASK);
            IWL_DEBUG_ISR(priv, "Tx interrupt\n");
            priv->isr_stats.tx++;
            handled |= CSR_INT_BIT_FH_TX;
            /* FH finished to write, send event */
            priv->ucode_write_complete = 1;
            wake_up_interruptible(&priv->wait_command_queue);
      }

      if (inta & ~handled) {
            IWL_ERR(priv, "Unhandled INTA bits 0x%08x\n", inta & ~handled);
            priv->isr_stats.unhandled++;
      }

      if (inta & ~(priv->inta_mask)) {
            IWL_WARN(priv, "Disabled INTA bits 0x%08x were pending\n",
                   inta & ~priv->inta_mask);
      }


      /* Re-enable all interrupts */
      /* only Re-enable if diabled by irq */
      if (test_bit(STATUS_INT_ENABLED, &priv->status))
            iwl_enable_interrupts(priv);

      spin_unlock_irqrestore(&priv->lock, flags);

}


/******************************************************************************
 *
 * uCode download functions
 *
 ******************************************************************************/

static void iwl_dealloc_ucode_pci(struct iwl_priv *priv)
{
      iwl_free_fw_desc(priv->pci_dev, &priv->ucode_code);
      iwl_free_fw_desc(priv->pci_dev, &priv->ucode_data);
      iwl_free_fw_desc(priv->pci_dev, &priv->ucode_data_backup);
      iwl_free_fw_desc(priv->pci_dev, &priv->ucode_init);
      iwl_free_fw_desc(priv->pci_dev, &priv->ucode_init_data);
      iwl_free_fw_desc(priv->pci_dev, &priv->ucode_boot);
}

static void iwl_nic_start(struct iwl_priv *priv)
{
      /* Remove all resets to allow NIC to operate */
      iwl_write32(priv, CSR_RESET, 0);
}


/**
 * iwl_read_ucode - Read uCode images from disk file.
 *
 * Copy into buffers for card to fetch via bus-mastering
 */
static int iwl_read_ucode(struct iwl_priv *priv)
{
      struct iwl_ucode *ucode;
      int ret = -EINVAL, index;
      const struct firmware *ucode_raw;
      const char *name_pre = priv->cfg->fw_name_pre;
      const unsigned int api_max = priv->cfg->ucode_api_max;
      const unsigned int api_min = priv->cfg->ucode_api_min;
      char buf[25];
      u8 *src;
      size_t len;
      u32 api_ver, inst_size, data_size, init_size, init_data_size, boot_size;

      /* Ask kernel firmware_class module to get the boot firmware off disk.
       * request_firmware() is synchronous, file is in memory on return. */
      for (index = api_max; index >= api_min; index--) {
            sprintf(buf, "%s%d%s", name_pre, index, ".ucode");
            ret = request_firmware(&ucode_raw, buf, &priv->pci_dev->dev);
            if (ret < 0) {
                  IWL_ERR(priv, "%s firmware file req failed: %d\n",
                          buf, ret);
                  if (ret == -ENOENT)
                        continue;
                  else
                        goto error;
            } else {
                  if (index < api_max)
                        IWL_ERR(priv, "Loaded firmware %s, "
                              "which is deprecated. "
                              "Please use API v%u instead.\n",
                                buf, api_max);

                  IWL_DEBUG_INFO(priv, "Got firmware '%s' file (%zd bytes) from disk\n",
                               buf, ucode_raw->size);
                  break;
            }
      }

      if (ret < 0)
            goto error;

      /* Make sure that we got at least our header! */
      if (ucode_raw->size < sizeof(*ucode)) {
            IWL_ERR(priv, "File size way too small!\n");
            ret = -EINVAL;
            goto err_release;
      }

      /* Data from ucode file:  header followed by uCode images */
      ucode = (void *)ucode_raw->data;

      priv->ucode_ver = le32_to_cpu(ucode->ver);
      api_ver = IWL_UCODE_API(priv->ucode_ver);
      inst_size = le32_to_cpu(ucode->inst_size);
      data_size = le32_to_cpu(ucode->data_size);
      init_size = le32_to_cpu(ucode->init_size);
      init_data_size = le32_to_cpu(ucode->init_data_size);
      boot_size = le32_to_cpu(ucode->boot_size);

      /* api_ver should match the api version forming part of the
       * firmware filename ... but we don't check for that and only rely
       * on the API version read from firmware header from here on forward */

      if (api_ver < api_min || api_ver > api_max) {
            IWL_ERR(priv, "Driver unable to support your firmware API. "
                    "Driver supports v%u, firmware is v%u.\n",
                    api_max, api_ver);
            priv->ucode_ver = 0;
            ret = -EINVAL;
            goto err_release;
      }
      if (api_ver != api_max)
            IWL_ERR(priv, "Firmware has old API version. Expected v%u, "
                    "got v%u. New firmware can be obtained "
                    "from http://www.intellinuxwireless.org.\n",
                    api_max, api_ver);

      IWL_INFO(priv, "loaded firmware version %u.%u.%u.%u\n",
             IWL_UCODE_MAJOR(priv->ucode_ver),
             IWL_UCODE_MINOR(priv->ucode_ver),
             IWL_UCODE_API(priv->ucode_ver),
             IWL_UCODE_SERIAL(priv->ucode_ver));

      IWL_DEBUG_INFO(priv, "f/w package hdr ucode version raw = 0x%x\n",
                   priv->ucode_ver);
      IWL_DEBUG_INFO(priv, "f/w package hdr runtime inst size = %u\n",
                   inst_size);
      IWL_DEBUG_INFO(priv, "f/w package hdr runtime data size = %u\n",
                   data_size);
      IWL_DEBUG_INFO(priv, "f/w package hdr init inst size = %u\n",
                   init_size);
      IWL_DEBUG_INFO(priv, "f/w package hdr init data size = %u\n",
                   init_data_size);
      IWL_DEBUG_INFO(priv, "f/w package hdr boot inst size = %u\n",
                   boot_size);

      /* Verify size of file vs. image size info in file's header */
      if (ucode_raw->size < sizeof(*ucode) +
            inst_size + data_size + init_size +
            init_data_size + boot_size) {

            IWL_DEBUG_INFO(priv, "uCode file size %d too small\n",
                         (int)ucode_raw->size);
            ret = -EINVAL;
            goto err_release;
      }

      /* Verify that uCode images will fit in card's SRAM */
      if (inst_size > priv->hw_params.max_inst_size) {
            IWL_DEBUG_INFO(priv, "uCode instr len %d too large to fit in\n",
                         inst_size);
            ret = -EINVAL;
            goto err_release;
      }

      if (data_size > priv->hw_params.max_data_size) {
            IWL_DEBUG_INFO(priv, "uCode data len %d too large to fit in\n",
                        data_size);
            ret = -EINVAL;
            goto err_release;
      }
      if (init_size > priv->hw_params.max_inst_size) {
            IWL_INFO(priv, "uCode init instr len %d too large to fit in\n",
                  init_size);
            ret = -EINVAL;
            goto err_release;
      }
      if (init_data_size > priv->hw_params.max_data_size) {
            IWL_INFO(priv, "uCode init data len %d too large to fit in\n",
                  init_data_size);
            ret = -EINVAL;
            goto err_release;
      }
      if (boot_size > priv->hw_params.max_bsm_size) {
            IWL_INFO(priv, "uCode boot instr len %d too large to fit in\n",
                  boot_size);
            ret = -EINVAL;
            goto err_release;
      }

      /* Allocate ucode buffers for card's bus-master loading ... */

      /* Runtime instructions and 2 copies of data:
       * 1) unmodified from disk
       * 2) backup cache for save/restore during power-downs */
      priv->ucode_code.len = inst_size;
      iwl_alloc_fw_desc(priv->pci_dev, &priv->ucode_code);

      priv->ucode_data.len = data_size;
      iwl_alloc_fw_desc(priv->pci_dev, &priv->ucode_data);

      priv->ucode_data_backup.len = data_size;
      iwl_alloc_fw_desc(priv->pci_dev, &priv->ucode_data_backup);

      if (!priv->ucode_code.v_addr || !priv->ucode_data.v_addr ||
          !priv->ucode_data_backup.v_addr)
            goto err_pci_alloc;

      /* Initialization instructions and data */
      if (init_size && init_data_size) {
            priv->ucode_init.len = init_size;
            iwl_alloc_fw_desc(priv->pci_dev, &priv->ucode_init);

            priv->ucode_init_data.len = init_data_size;
            iwl_alloc_fw_desc(priv->pci_dev, &priv->ucode_init_data);

            if (!priv->ucode_init.v_addr || !priv->ucode_init_data.v_addr)
                  goto err_pci_alloc;
      }

      /* Bootstrap (instructions only, no data) */
      if (boot_size) {
            priv->ucode_boot.len = boot_size;
            iwl_alloc_fw_desc(priv->pci_dev, &priv->ucode_boot);

            if (!priv->ucode_boot.v_addr)
                  goto err_pci_alloc;
      }

      /* Copy images into buffers for card's bus-master reads ... */

      /* Runtime instructions (first block of data in file) */
      src = &ucode->data[0];
      len = priv->ucode_code.len;
      IWL_DEBUG_INFO(priv, "Copying (but not loading) uCode instr len %Zd\n", len);
      memcpy(priv->ucode_code.v_addr, src, len);
      IWL_DEBUG_INFO(priv, "uCode instr buf vaddr = 0x%p, paddr = 0x%08x\n",
            priv->ucode_code.v_addr, (u32)priv->ucode_code.p_addr);

      /* Runtime data (2nd block)
       * NOTE:  Copy into backup buffer will be done in iwl_up()  */
      src = &ucode->data[inst_size];
      len = priv->ucode_data.len;
      IWL_DEBUG_INFO(priv, "Copying (but not loading) uCode data len %Zd\n", len);
      memcpy(priv->ucode_data.v_addr, src, len);
      memcpy(priv->ucode_data_backup.v_addr, src, len);

      /* Initialization instructions (3rd block) */
      if (init_size) {
            src = &ucode->data[inst_size + data_size];
            len = priv->ucode_init.len;
            IWL_DEBUG_INFO(priv, "Copying (but not loading) init instr len %Zd\n",
                        len);
            memcpy(priv->ucode_init.v_addr, src, len);
      }

      /* Initialization data (4th block) */
      if (init_data_size) {
            src = &ucode->data[inst_size + data_size + init_size];
            len = priv->ucode_init_data.len;
            IWL_DEBUG_INFO(priv, "Copying (but not loading) init data len %Zd\n",
                         len);
            memcpy(priv->ucode_init_data.v_addr, src, len);
      }

      /* Bootstrap instructions (5th block) */
      src = &ucode->data[inst_size + data_size + init_size + init_data_size];
      len = priv->ucode_boot.len;
      IWL_DEBUG_INFO(priv, "Copying (but not loading) boot instr len %Zd\n", len);
      memcpy(priv->ucode_boot.v_addr, src, len);

      /* We have our copies now, allow OS release its copies */
      release_firmware(ucode_raw);
      return 0;

 err_pci_alloc:
      IWL_ERR(priv, "failed to allocate pci memory\n");
      ret = -ENOMEM;
      iwl_dealloc_ucode_pci(priv);

 err_release:
      release_firmware(ucode_raw);

 error:
      return ret;
}

/**
 * iwl_alive_start - called after REPLY_ALIVE notification received
 *                   from protocol/runtime uCode (initialization uCode's
 *                   Alive gets handled by iwl_init_alive_start()).
 */
static void iwl_alive_start(struct iwl_priv *priv)
{
      int ret = 0;

      IWL_DEBUG_INFO(priv, "Runtime Alive received.\n");

      if (priv->card_alive.is_valid != UCODE_VALID_OK) {
            /* We had an error bringing up the hardware, so take it
             * all the way back down so we can try again */
            IWL_DEBUG_INFO(priv, "Alive failed.\n");
            goto restart;
      }

      /* Initialize uCode has loaded Runtime uCode ... verify inst image.
       * This is a paranoid check, because we would not have gotten the
       * "runtime" alive if code weren't properly loaded.  */
      if (iwl_verify_ucode(priv)) {
            /* Runtime instruction load was bad;
             * take it all the way back down so we can try again */
            IWL_DEBUG_INFO(priv, "Bad runtime uCode load.\n");
            goto restart;
      }

      iwl_clear_stations_table(priv);
      ret = priv->cfg->ops->lib->alive_notify(priv);
      if (ret) {
            IWL_WARN(priv,
                  "Could not complete ALIVE transition [ntf]: %d\n", ret);
            goto restart;
      }

      /* After the ALIVE response, we can send host commands to the uCode */
      set_bit(STATUS_ALIVE, &priv->status);

      if (iwl_is_rfkill(priv))
            return;

      ieee80211_wake_queues(priv->hw);

      priv->active_rate = priv->rates_mask;
      priv->active_rate_basic = priv->rates_mask & IWL_BASIC_RATES_MASK;

      if (iwl_is_associated(priv)) {
            struct iwl_rxon_cmd *active_rxon =
                        (struct iwl_rxon_cmd *)&priv->active_rxon;
            /* apply any changes in staging */
            priv->staging_rxon.filter_flags |= RXON_FILTER_ASSOC_MSK;
            active_rxon->filter_flags &= ~RXON_FILTER_ASSOC_MSK;
      } else {
            /* Initialize our rx_config data */
            iwl_connection_init_rx_config(priv, priv->iw_mode);

            if (priv->cfg->ops->hcmd->set_rxon_chain)
                  priv->cfg->ops->hcmd->set_rxon_chain(priv);

            memcpy(priv->staging_rxon.node_addr, priv->mac_addr, ETH_ALEN);
      }

      /* Configure Bluetooth device coexistence support */
      iwl_send_bt_config(priv);

      iwl_reset_run_time_calib(priv);

      /* Configure the adapter for unassociated operation */
      iwlcore_commit_rxon(priv);

      /* At this point, the NIC is initialized and operational */
      iwl_rf_kill_ct_config(priv);

      iwl_leds_register(priv);

      IWL_DEBUG_INFO(priv, "ALIVE processing complete.\n");
      set_bit(STATUS_READY, &priv->status);
      wake_up_interruptible(&priv->wait_command_queue);

      iwl_power_update_mode(priv, 1);

      /* reassociate for ADHOC mode */
      if (priv->vif && (priv->iw_mode == NL80211_IFTYPE_ADHOC)) {
            struct sk_buff *beacon = ieee80211_beacon_get(priv->hw,
                                                priv->vif);
            if (beacon)
                  iwl_mac_beacon_update(priv->hw, beacon);
      }


      if (test_and_clear_bit(STATUS_MODE_PENDING, &priv->status))
            iwl_set_mode(priv, priv->iw_mode);

      return;

 restart:
      queue_work(priv->workqueue, &priv->restart);
}

static void iwl_cancel_deferred_work(struct iwl_priv *priv);

static void __iwl_down(struct iwl_priv *priv)
{
      unsigned long flags;
      int exit_pending = test_bit(STATUS_EXIT_PENDING, &priv->status);

      IWL_DEBUG_INFO(priv, DRV_NAME " is going down\n");

      if (!exit_pending)
            set_bit(STATUS_EXIT_PENDING, &priv->status);

      iwl_leds_unregister(priv);

      iwl_clear_stations_table(priv);

      /* Unblock any waiting calls */
      wake_up_interruptible_all(&priv->wait_command_queue);

      /* Wipe out the EXIT_PENDING status bit if we are not actually
       * exiting the module */
      if (!exit_pending)
            clear_bit(STATUS_EXIT_PENDING, &priv->status);

      /* stop and reset the on-board processor */
      iwl_write32(priv, CSR_RESET, CSR_RESET_REG_FLAG_NEVO_RESET);

      /* tell the device to stop sending interrupts */
      spin_lock_irqsave(&priv->lock, flags);
      iwl_disable_interrupts(priv);
      spin_unlock_irqrestore(&priv->lock, flags);
      iwl_synchronize_irq(priv);

      if (priv->mac80211_registered)
            ieee80211_stop_queues(priv->hw);

      /* If we have not previously called iwl_init() then
       * clear all bits but the RF Kill bit and return */
      if (!iwl_is_init(priv)) {
            priv->status = test_bit(STATUS_RF_KILL_HW, &priv->status) <<
                              STATUS_RF_KILL_HW |
                         test_bit(STATUS_GEO_CONFIGURED, &priv->status) <<
                              STATUS_GEO_CONFIGURED |
                         test_bit(STATUS_EXIT_PENDING, &priv->status) <<
                              STATUS_EXIT_PENDING;
            goto exit;
      }

      /* ...otherwise clear out all the status bits but the RF Kill
       * bit and continue taking the NIC down. */
      priv->status &= test_bit(STATUS_RF_KILL_HW, &priv->status) <<
                        STATUS_RF_KILL_HW |
                  test_bit(STATUS_GEO_CONFIGURED, &priv->status) <<
                        STATUS_GEO_CONFIGURED |
                  test_bit(STATUS_FW_ERROR, &priv->status) <<
                        STATUS_FW_ERROR |
                   test_bit(STATUS_EXIT_PENDING, &priv->status) <<
                        STATUS_EXIT_PENDING;

      /* device going down, Stop using ICT table */
      iwl_disable_ict(priv);
      spin_lock_irqsave(&priv->lock, flags);
      iwl_clear_bit(priv, CSR_GP_CNTRL,
                   CSR_GP_CNTRL_REG_FLAG_MAC_ACCESS_REQ);
      spin_unlock_irqrestore(&priv->lock, flags);

      iwl_txq_ctx_stop(priv);
      iwl_rxq_stop(priv);

      iwl_write_prph(priv, APMG_CLK_DIS_REG,
                        APMG_CLK_VAL_DMA_CLK_RQT);

      udelay(5);

      /* FIXME: apm_ops.suspend(priv) */
      if (exit_pending)
            priv->cfg->ops->lib->apm_ops.stop(priv);
      else
            priv->cfg->ops->lib->apm_ops.reset(priv);
 exit:
      memset(&priv->card_alive, 0, sizeof(struct iwl_alive_resp));

      if (priv->ibss_beacon)
            dev_kfree_skb(priv->ibss_beacon);
      priv->ibss_beacon = NULL;

      /* clear out any free frames */
      iwl_clear_free_frames(priv);
}

static void iwl_down(struct iwl_priv *priv)
{
      mutex_lock(&priv->mutex);
      __iwl_down(priv);
      mutex_unlock(&priv->mutex);

      iwl_cancel_deferred_work(priv);
}

#define HW_READY_TIMEOUT (50)

static int iwl_set_hw_ready(struct iwl_priv *priv)
{
      int ret = 0;

      iwl_set_bit(priv, CSR_HW_IF_CONFIG_REG,
            CSR_HW_IF_CONFIG_REG_BIT_NIC_READY);

      /* See if we got it */
      ret = iwl_poll_bit(priv, CSR_HW_IF_CONFIG_REG,
                        CSR_HW_IF_CONFIG_REG_BIT_NIC_READY,
                        CSR_HW_IF_CONFIG_REG_BIT_NIC_READY,
                        HW_READY_TIMEOUT);
      if (ret != -ETIMEDOUT)
            priv->hw_ready = true;
      else
            priv->hw_ready = false;

      IWL_DEBUG_INFO(priv, "hardware %s\n",
                  (priv->hw_ready == 1) ? "ready" : "not ready");
      return ret;
}

static int iwl_prepare_card_hw(struct iwl_priv *priv)
{
      int ret = 0;

      IWL_DEBUG_INFO(priv, "iwl_prepare_card_hw enter \n");

      iwl_set_bit(priv, CSR_HW_IF_CONFIG_REG,
                  CSR_HW_IF_CONFIG_REG_PREPARE);

      ret = iwl_poll_bit(priv, CSR_HW_IF_CONFIG_REG,
                  ~CSR_HW_IF_CONFIG_REG_BIT_NIC_PREPARE_DONE,
                  CSR_HW_IF_CONFIG_REG_BIT_NIC_PREPARE_DONE, 150000);

      if (ret != -ETIMEDOUT)
            iwl_set_hw_ready(priv);

      return ret;
}

#define MAX_HW_RESTARTS 5

static int __iwl_up(struct iwl_priv *priv)
{
      int i;
      int ret;

      if (test_bit(STATUS_EXIT_PENDING, &priv->status)) {
            IWL_WARN(priv, "Exit pending; will not bring the NIC up\n");
            return -EIO;
      }

      if (!priv->ucode_data_backup.v_addr || !priv->ucode_data.v_addr) {
            IWL_ERR(priv, "ucode not available for device bringup\n");
            return -EIO;
      }

      iwl_prepare_card_hw(priv);

      if (!priv->hw_ready) {
            IWL_WARN(priv, "Exit HW not ready\n");
            return -EIO;
      }

      /* If platform's RF_KILL switch is NOT set to KILL */
      if (iwl_read32(priv, CSR_GP_CNTRL) & CSR_GP_CNTRL_REG_FLAG_HW_RF_KILL_SW)
            clear_bit(STATUS_RF_KILL_HW, &priv->status);
      else
            set_bit(STATUS_RF_KILL_HW, &priv->status);

      if (iwl_is_rfkill(priv)) {
            wiphy_rfkill_set_hw_state(priv->hw->wiphy, true);

            iwl_enable_interrupts(priv);
            IWL_WARN(priv, "Radio disabled by HW RF Kill switch\n");
            return 0;
      }

      iwl_write32(priv, CSR_INT, 0xFFFFFFFF);

      ret = iwl_hw_nic_init(priv);
      if (ret) {
            IWL_ERR(priv, "Unable to init nic\n");
            return ret;
      }

      /* make sure rfkill handshake bits are cleared */
      iwl_write32(priv, CSR_UCODE_DRV_GP1_CLR, CSR_UCODE_SW_BIT_RFKILL);
      iwl_write32(priv, CSR_UCODE_DRV_GP1_CLR,
                CSR_UCODE_DRV_GP1_BIT_CMD_BLOCKED);

      /* clear (again), then enable host interrupts */
      iwl_write32(priv, CSR_INT, 0xFFFFFFFF);
      iwl_enable_interrupts(priv);

      /* really make sure rfkill handshake bits are cleared */
      iwl_write32(priv, CSR_UCODE_DRV_GP1_CLR, CSR_UCODE_SW_BIT_RFKILL);
      iwl_write32(priv, CSR_UCODE_DRV_GP1_CLR, CSR_UCODE_SW_BIT_RFKILL);

      /* Copy original ucode data image from disk into backup cache.
       * This will be used to initialize the on-board processor's
       * data SRAM for a clean start when the runtime program first loads. */
      memcpy(priv->ucode_data_backup.v_addr, priv->ucode_data.v_addr,
             priv->ucode_data.len);

      for (i = 0; i < MAX_HW_RESTARTS; i++) {

            iwl_clear_stations_table(priv);

            /* load bootstrap state machine,
             * load bootstrap program into processor's memory,
             * prepare to load the "initialize" uCode */
            ret = priv->cfg->ops->lib->load_ucode(priv);

            if (ret) {
                  IWL_ERR(priv, "Unable to set up bootstrap uCode: %d\n",
                        ret);
                  continue;
            }

            /* start card; "initialize" will load runtime ucode */
            iwl_nic_start(priv);

            IWL_DEBUG_INFO(priv, DRV_NAME " is coming up\n");

            return 0;
      }

      set_bit(STATUS_EXIT_PENDING, &priv->status);
      __iwl_down(priv);
      clear_bit(STATUS_EXIT_PENDING, &priv->status);

      /* tried to restart and config the device for as long as our
       * patience could withstand */
      IWL_ERR(priv, "Unable to initialize device after %d attempts.\n", i);
      return -EIO;
}


/*****************************************************************************
 *
 * Workqueue callbacks
 *
 *****************************************************************************/

static void iwl_bg_init_alive_start(struct work_struct *data)
{
      struct iwl_priv *priv =
          container_of(data, struct iwl_priv, init_alive_start.work);

      if (test_bit(STATUS_EXIT_PENDING, &priv->status))
            return;

      mutex_lock(&priv->mutex);
      priv->cfg->ops->lib->init_alive_start(priv);
      mutex_unlock(&priv->mutex);
}

static void iwl_bg_alive_start(struct work_struct *data)
{
      struct iwl_priv *priv =
          container_of(data, struct iwl_priv, alive_start.work);

      if (test_bit(STATUS_EXIT_PENDING, &priv->status))
            return;

      /* enable dram interrupt */
      iwl_reset_ict(priv);

      mutex_lock(&priv->mutex);
      iwl_alive_start(priv);
      mutex_unlock(&priv->mutex);
}

static void iwl_bg_run_time_calib_work(struct work_struct *work)
{
      struct iwl_priv *priv = container_of(work, struct iwl_priv,
                  run_time_calib_work);

      mutex_lock(&priv->mutex);

      if (test_bit(STATUS_EXIT_PENDING, &priv->status) ||
          test_bit(STATUS_SCANNING, &priv->status)) {
            mutex_unlock(&priv->mutex);
            return;
      }

      if (priv->start_calib) {
            iwl_chain_noise_calibration(priv, &priv->statistics);

            iwl_sensitivity_calibration(priv, &priv->statistics);
      }

      mutex_unlock(&priv->mutex);
      return;
}

static void iwl_bg_up(struct work_struct *data)
{
      struct iwl_priv *priv = container_of(data, struct iwl_priv, up);

      if (test_bit(STATUS_EXIT_PENDING, &priv->status))
            return;

      mutex_lock(&priv->mutex);
      __iwl_up(priv);
      mutex_unlock(&priv->mutex);
}

static void iwl_bg_restart(struct work_struct *data)
{
      struct iwl_priv *priv = container_of(data, struct iwl_priv, restart);

      if (test_bit(STATUS_EXIT_PENDING, &priv->status))
            return;

      if (test_and_clear_bit(STATUS_FW_ERROR, &priv->status)) {
            mutex_lock(&priv->mutex);
            priv->vif = NULL;
            priv->is_open = 0;
            mutex_unlock(&priv->mutex);
            iwl_down(priv);
            ieee80211_restart_hw(priv->hw);
      } else {
            iwl_down(priv);
            queue_work(priv->workqueue, &priv->up);
      }
}

static void iwl_bg_rx_replenish(struct work_struct *data)
{
      struct iwl_priv *priv =
          container_of(data, struct iwl_priv, rx_replenish);

      if (test_bit(STATUS_EXIT_PENDING, &priv->status))
            return;

      mutex_lock(&priv->mutex);
      iwl_rx_replenish(priv);
      mutex_unlock(&priv->mutex);
}

#define IWL_DELAY_NEXT_SCAN (HZ*2)

void iwl_post_associate(struct iwl_priv *priv)
{
      struct ieee80211_conf *conf = NULL;
      int ret = 0;
      unsigned long flags;

      if (priv->iw_mode == NL80211_IFTYPE_AP) {
            IWL_ERR(priv, "%s Should not be called in AP mode\n", __func__);
            return;
      }

      IWL_DEBUG_ASSOC(priv, "Associated as %d to: %pM\n",
                  priv->assoc_id, priv->active_rxon.bssid_addr);


      if (test_bit(STATUS_EXIT_PENDING, &priv->status))
            return;


      if (!priv->vif || !priv->is_open)
            return;

      iwl_scan_cancel_timeout(priv, 200);

      conf = ieee80211_get_hw_conf(priv->hw);

      priv->staging_rxon.filter_flags &= ~RXON_FILTER_ASSOC_MSK;
      iwlcore_commit_rxon(priv);

      iwl_setup_rxon_timing(priv);
      ret = iwl_send_cmd_pdu(priv, REPLY_RXON_TIMING,
                        sizeof(priv->rxon_timing), &priv->rxon_timing);
      if (ret)
            IWL_WARN(priv, "REPLY_RXON_TIMING failed - "
                      "Attempting to continue.\n");

      priv->staging_rxon.filter_flags |= RXON_FILTER_ASSOC_MSK;

      iwl_set_rxon_ht(priv, &priv->current_ht_config);

      if (priv->cfg->ops->hcmd->set_rxon_chain)
            priv->cfg->ops->hcmd->set_rxon_chain(priv);

      priv->staging_rxon.assoc_id = cpu_to_le16(priv->assoc_id);

      IWL_DEBUG_ASSOC(priv, "assoc id %d beacon interval %d\n",
                  priv->assoc_id, priv->beacon_int);

      if (priv->assoc_capability & WLAN_CAPABILITY_SHORT_PREAMBLE)
            priv->staging_rxon.flags |= RXON_FLG_SHORT_PREAMBLE_MSK;
      else
            priv->staging_rxon.flags &= ~RXON_FLG_SHORT_PREAMBLE_MSK;

      if (priv->staging_rxon.flags & RXON_FLG_BAND_24G_MSK) {
            if (priv->assoc_capability & WLAN_CAPABILITY_SHORT_SLOT_TIME)
                  priv->staging_rxon.flags |= RXON_FLG_SHORT_SLOT_MSK;
            else
                  priv->staging_rxon.flags &= ~RXON_FLG_SHORT_SLOT_MSK;

            if (priv->iw_mode == NL80211_IFTYPE_ADHOC)
                  priv->staging_rxon.flags &= ~RXON_FLG_SHORT_SLOT_MSK;

      }

      iwlcore_commit_rxon(priv);

      switch (priv->iw_mode) {
      case NL80211_IFTYPE_STATION:
            break;

      case NL80211_IFTYPE_ADHOC:

            /* assume default assoc id */
            priv->assoc_id = 1;

            iwl_rxon_add_station(priv, priv->bssid, 0);
            iwl_send_beacon_cmd(priv);

            break;

      default:
            IWL_ERR(priv, "%s Should not be called in %d mode\n",
                    __func__, priv->iw_mode);
            break;
      }

      if (priv->iw_mode == NL80211_IFTYPE_ADHOC)
            priv->assoc_station_added = 1;

      spin_lock_irqsave(&priv->lock, flags);
      iwl_activate_qos(priv, 0);
      spin_unlock_irqrestore(&priv->lock, flags);

      /* the chain noise calibration will enabled PM upon completion
       * If chain noise has already been run, then we need to enable
       * power management here */
      if (priv->chain_noise_data.state == IWL_CHAIN_NOISE_DONE)
            iwl_power_update_mode(priv, 0);

      /* Enable Rx differential gain and sensitivity calibrations */
      iwl_chain_noise_reset(priv);
      priv->start_calib = 1;

}

/*****************************************************************************
 *
 * mac80211 entry point functions
 *
 *****************************************************************************/

#define UCODE_READY_TIMEOUT   (4 * HZ)

static int iwl_mac_start(struct ieee80211_hw *hw)
{
      struct iwl_priv *priv = hw->priv;
      int ret;

      IWL_DEBUG_MAC80211(priv, "enter\n");

      /* we should be verifying the device is ready to be opened */
      mutex_lock(&priv->mutex);

      /* fetch ucode file from disk, alloc and copy to bus-master buffers ...
       * ucode filename and max sizes are card-specific. */

      if (!priv->ucode_code.len) {
            ret = iwl_read_ucode(priv);
            if (ret) {
                  IWL_ERR(priv, "Could not read microcode: %d\n", ret);
                  mutex_unlock(&priv->mutex);
                  return ret;
            }
      }

      ret = __iwl_up(priv);

      mutex_unlock(&priv->mutex);

      if (ret)
            return ret;

      if (iwl_is_rfkill(priv))
            goto out;

      IWL_DEBUG_INFO(priv, "Start UP work done.\n");

      /* Wait for START_ALIVE from Run Time ucode. Otherwise callbacks from
       * mac80211 will not be run successfully. */
      ret = wait_event_interruptible_timeout(priv->wait_command_queue,
                  test_bit(STATUS_READY, &priv->status),
                  UCODE_READY_TIMEOUT);
      if (!ret) {
            if (!test_bit(STATUS_READY, &priv->status)) {
                  IWL_ERR(priv, "START_ALIVE timeout after %dms.\n",
                        jiffies_to_msecs(UCODE_READY_TIMEOUT));
                  return -ETIMEDOUT;
            }
      }

out:
      priv->is_open = 1;
      IWL_DEBUG_MAC80211(priv, "leave\n");
      return 0;
}

static void iwl_mac_stop(struct ieee80211_hw *hw)
{
      struct iwl_priv *priv = hw->priv;

      IWL_DEBUG_MAC80211(priv, "enter\n");

      if (!priv->is_open)
            return;

      priv->is_open = 0;

      if (iwl_is_ready_rf(priv)) {
            /* stop mac, cancel any scan request and clear
             * RXON_FILTER_ASSOC_MSK BIT
             */
            mutex_lock(&priv->mutex);
            iwl_scan_cancel_timeout(priv, 100);
            mutex_unlock(&priv->mutex);
      }

      iwl_down(priv);

      flush_workqueue(priv->workqueue);

      /* enable interrupts again in order to receive rfkill changes */
      iwl_write32(priv, CSR_INT, 0xFFFFFFFF);
      iwl_enable_interrupts(priv);

      IWL_DEBUG_MAC80211(priv, "leave\n");
}

static int iwl_mac_tx(struct ieee80211_hw *hw, struct sk_buff *skb)
{
      struct iwl_priv *priv = hw->priv;

      IWL_DEBUG_MACDUMP(priv, "enter\n");

      IWL_DEBUG_TX(priv, "dev->xmit(%d bytes) at rate 0x%02x\n", skb->len,
                 ieee80211_get_tx_rate(hw, IEEE80211_SKB_CB(skb))->bitrate);

      if (iwl_tx_skb(priv, skb))
            dev_kfree_skb_any(skb);

      IWL_DEBUG_MACDUMP(priv, "leave\n");
      return NETDEV_TX_OK;
}

void iwl_config_ap(struct iwl_priv *priv)
{
      int ret = 0;
      unsigned long flags;

      if (test_bit(STATUS_EXIT_PENDING, &priv->status))
            return;

      /* The following should be done only at AP bring up */
      if (!iwl_is_associated(priv)) {

            /* RXON - unassoc (to set timing command) */
            priv->staging_rxon.filter_flags &= ~RXON_FILTER_ASSOC_MSK;
            iwlcore_commit_rxon(priv);

            /* RXON Timing */
            iwl_setup_rxon_timing(priv);
            ret = iwl_send_cmd_pdu(priv, REPLY_RXON_TIMING,
                        sizeof(priv->rxon_timing), &priv->rxon_timing);
            if (ret)
                  IWL_WARN(priv, "REPLY_RXON_TIMING failed - "
                              "Attempting to continue.\n");

            if (priv->cfg->ops->hcmd->set_rxon_chain)
                  priv->cfg->ops->hcmd->set_rxon_chain(priv);

            /* FIXME: what should be the assoc_id for AP? */
            priv->staging_rxon.assoc_id = cpu_to_le16(priv->assoc_id);
            if (priv->assoc_capability & WLAN_CAPABILITY_SHORT_PREAMBLE)
                  priv->staging_rxon.flags |=
                        RXON_FLG_SHORT_PREAMBLE_MSK;
            else
                  priv->staging_rxon.flags &=
                        ~RXON_FLG_SHORT_PREAMBLE_MSK;

            if (priv->staging_rxon.flags & RXON_FLG_BAND_24G_MSK) {
                  if (priv->assoc_capability &
                        WLAN_CAPABILITY_SHORT_SLOT_TIME)
                        priv->staging_rxon.flags |=
                              RXON_FLG_SHORT_SLOT_MSK;
                  else
                        priv->staging_rxon.flags &=
                              ~RXON_FLG_SHORT_SLOT_MSK;

                  if (priv->iw_mode == NL80211_IFTYPE_ADHOC)
                        priv->staging_rxon.flags &=
                              ~RXON_FLG_SHORT_SLOT_MSK;
            }
            /* restore RXON assoc */
            priv->staging_rxon.filter_flags |= RXON_FILTER_ASSOC_MSK;
            iwlcore_commit_rxon(priv);
            spin_lock_irqsave(&priv->lock, flags);
            iwl_activate_qos(priv, 1);
            spin_unlock_irqrestore(&priv->lock, flags);
            iwl_rxon_add_station(priv, iwl_bcast_addr, 0);
      }
      iwl_send_beacon_cmd(priv);

      /* FIXME - we need to add code here to detect a totally new
       * configuration, reset the AP, unassoc, rxon timing, assoc,
       * clear sta table, add BCAST sta... */
}

static void iwl_mac_update_tkip_key(struct ieee80211_hw *hw,
                  struct ieee80211_key_conf *keyconf, const u8 *addr,
                  u32 iv32, u16 *phase1key)
{

      struct iwl_priv *priv = hw->priv;
      IWL_DEBUG_MAC80211(priv, "enter\n");

      iwl_update_tkip_key(priv, keyconf, addr, iv32, phase1key);

      IWL_DEBUG_MAC80211(priv, "leave\n");
}

static int iwl_mac_set_key(struct ieee80211_hw *hw, enum set_key_cmd cmd,
                     struct ieee80211_vif *vif,
                     struct ieee80211_sta *sta,
                     struct ieee80211_key_conf *key)
{
      struct iwl_priv *priv = hw->priv;
      const u8 *addr;
      int ret;
      u8 sta_id;
      bool is_default_wep_key = false;

      IWL_DEBUG_MAC80211(priv, "enter\n");

      if (priv->hw_params.sw_crypto) {
            IWL_DEBUG_MAC80211(priv, "leave - hwcrypto disabled\n");
            return -EOPNOTSUPP;
      }
      addr = sta ? sta->addr : iwl_bcast_addr;
      sta_id = iwl_find_station(priv, addr);
      if (sta_id == IWL_INVALID_STATION) {
            IWL_DEBUG_MAC80211(priv, "leave - %pM not in station map.\n",
                           addr);
            return -EINVAL;

      }

      mutex_lock(&priv->mutex);
      iwl_scan_cancel_timeout(priv, 100);
      mutex_unlock(&priv->mutex);

      /* If we are getting WEP group key and we didn't receive any key mapping
       * so far, we are in legacy wep mode (group key only), otherwise we are
       * in 1X mode.
       * In legacy wep mode, we use another host command to the uCode */
      if (key->alg == ALG_WEP && sta_id == priv->hw_params.bcast_sta_id &&
            priv->iw_mode != NL80211_IFTYPE_AP) {
            if (cmd == SET_KEY)
                  is_default_wep_key = !priv->key_mapping_key;
            else
                  is_default_wep_key =
                              (key->hw_key_idx == HW_KEY_DEFAULT);
      }

      switch (cmd) {
      case SET_KEY:
            if (is_default_wep_key)
                  ret = iwl_set_default_wep_key(priv, key);
            else
                  ret = iwl_set_dynamic_key(priv, key, sta_id);

            IWL_DEBUG_MAC80211(priv, "enable hwcrypto key\n");
            break;
      case DISABLE_KEY:
            if (is_default_wep_key)
                  ret = iwl_remove_default_wep_key(priv, key);
            else
                  ret = iwl_remove_dynamic_key(priv, key, sta_id);

            IWL_DEBUG_MAC80211(priv, "disable hwcrypto key\n");
            break;
      default:
            ret = -EINVAL;
      }

      IWL_DEBUG_MAC80211(priv, "leave\n");

      return ret;
}

static int iwl_mac_ampdu_action(struct ieee80211_hw *hw,
                       enum ieee80211_ampdu_mlme_action action,
                       struct ieee80211_sta *sta, u16 tid, u16 *ssn)
{
      struct iwl_priv *priv = hw->priv;
      int ret;

      IWL_DEBUG_HT(priv, "A-MPDU action on addr %pM tid %d\n",
                 sta->addr, tid);

      if (!(priv->cfg->sku & IWL_SKU_N))
            return -EACCES;

      switch (action) {
      case IEEE80211_AMPDU_RX_START:
            IWL_DEBUG_HT(priv, "start Rx\n");
            return iwl_sta_rx_agg_start(priv, sta->addr, tid, *ssn);
      case IEEE80211_AMPDU_RX_STOP:
            IWL_DEBUG_HT(priv, "stop Rx\n");
            ret = iwl_sta_rx_agg_stop(priv, sta->addr, tid);
            if (test_bit(STATUS_EXIT_PENDING, &priv->status))
                  return 0;
            else
                  return ret;
      case IEEE80211_AMPDU_TX_START:
            IWL_DEBUG_HT(priv, "start Tx\n");
            return iwl_tx_agg_start(priv, sta->addr, tid, ssn);
      case IEEE80211_AMPDU_TX_STOP:
            IWL_DEBUG_HT(priv, "stop Tx\n");
            ret = iwl_tx_agg_stop(priv, sta->addr, tid);
            if (test_bit(STATUS_EXIT_PENDING, &priv->status))
                  return 0;
            else
                  return ret;
      default:
            IWL_DEBUG_HT(priv, "unknown\n");
            return -EINVAL;
            break;
      }
      return 0;
}

static int iwl_mac_get_stats(struct ieee80211_hw *hw,
                       struct ieee80211_low_level_stats *stats)
{
      struct iwl_priv *priv = hw->priv;

      priv = hw->priv;
      IWL_DEBUG_MAC80211(priv, "enter\n");
      IWL_DEBUG_MAC80211(priv, "leave\n");

      return 0;
}

/*****************************************************************************
 *
 * sysfs attributes
 *
 *****************************************************************************/

#ifdef CONFIG_IWLWIFI_DEBUG

/*
 * The following adds a new attribute to the sysfs representation
 * of this device driver (i.e. a new file in /sys/class/net/wlan0/device/)
 * used for controlling the debug level.
 *
 * See the level definitions in iwl for details.
 */

static ssize_t show_debug_level(struct device *d,
                        struct device_attribute *attr, char *buf)
{
      struct iwl_priv *priv = dev_get_drvdata(d);

      return sprintf(buf, "0x%08X\n", priv->debug_level);
}
static ssize_t store_debug_level(struct device *d,
                        struct device_attribute *attr,
                         const char *buf, size_t count)
{
      struct iwl_priv *priv = dev_get_drvdata(d);
      unsigned long val;
      int ret;

      ret = strict_strtoul(buf, 0, &val);
      if (ret)
            IWL_ERR(priv, "%s is not in hex or decimal form.\n", buf);
      else
            priv->debug_level = val;

      return strnlen(buf, count);
}

static DEVICE_ATTR(debug_level, S_IWUSR | S_IRUGO,
                  show_debug_level, store_debug_level);


#endif /* CONFIG_IWLWIFI_DEBUG */


static ssize_t show_version(struct device *d,
                        struct device_attribute *attr, char *buf)
{
      struct iwl_priv *priv = dev_get_drvdata(d);
      struct iwl_alive_resp *palive = &priv->card_alive;
      ssize_t pos = 0;
      u16 eeprom_ver;

      if (palive->is_valid)
            pos += sprintf(buf + pos,
                        "fw version: 0x%01X.0x%01X.0x%01X.0x%01X\n"
                        "fw type: 0x%01X 0x%01X\n",
                        palive->ucode_major, palive->ucode_minor,
                        palive->sw_rev[0], palive->sw_rev[1],
                        palive->ver_type, palive->ver_subtype);
      else
            pos += sprintf(buf + pos, "fw not loaded\n");

      if (priv->eeprom) {
            eeprom_ver = iwl_eeprom_query16(priv, EEPROM_VERSION);
            pos += sprintf(buf + pos, "NVM Type: %s, version: 0x%x\n",
                         (priv->nvm_device_type == NVM_DEVICE_TYPE_OTP)
                         ? "OTP" : "EEPROM", eeprom_ver);

      } else {
            pos += sprintf(buf + pos, "EEPROM not initialzed\n");
      }

      return pos;
}

static DEVICE_ATTR(version, S_IWUSR | S_IRUGO, show_version, NULL);

static ssize_t show_temperature(struct device *d,
                        struct device_attribute *attr, char *buf)
{
      struct iwl_priv *priv = dev_get_drvdata(d);

      if (!iwl_is_alive(priv))
            return -EAGAIN;

      return sprintf(buf, "%d\n", priv->temperature);
}

static DEVICE_ATTR(temperature, S_IRUGO, show_temperature, NULL);

static ssize_t show_tx_power(struct device *d,
                       struct device_attribute *attr, char *buf)
{
      struct iwl_priv *priv = dev_get_drvdata(d);

      if (!iwl_is_ready_rf(priv))
            return sprintf(buf, "off\n");
      else
            return sprintf(buf, "%d\n", priv->tx_power_user_lmt);
}

static ssize_t store_tx_power(struct device *d,
                        struct device_attribute *attr,
                        const char *buf, size_t count)
{
      struct iwl_priv *priv = dev_get_drvdata(d);
      unsigned long val;
      int ret;

      ret = strict_strtoul(buf, 10, &val);
      if (ret)
            IWL_INFO(priv, "%s is not in decimal form.\n", buf);
      else
            iwl_set_tx_power(priv, val, false);

      return count;
}

static DEVICE_ATTR(tx_power, S_IWUSR | S_IRUGO, show_tx_power, store_tx_power);

static ssize_t show_flags(struct device *d,
                    struct device_attribute *attr, char *buf)
{
      struct iwl_priv *priv = dev_get_drvdata(d);

      return sprintf(buf, "0x%04X\n", priv->active_rxon.flags);
}

static ssize_t store_flags(struct device *d,
                     struct device_attribute *attr,
                     const char *buf, size_t count)
{
      struct iwl_priv *priv = dev_get_drvdata(d);
      unsigned long val;
      u32 flags;
      int ret = strict_strtoul(buf, 0, &val);
      if (ret)
            return ret;
      flags = (u32)val;

      mutex_lock(&priv->mutex);
      if (le32_to_cpu(priv->staging_rxon.flags) != flags) {
            /* Cancel any currently running scans... */
            if (iwl_scan_cancel_timeout(priv, 100))
                  IWL_WARN(priv, "Could not cancel scan.\n");
            else {
                  IWL_DEBUG_INFO(priv, "Commit rxon.flags = 0x%04X\n", flags);
                  priv->staging_rxon.flags = cpu_to_le32(flags);
                  iwlcore_commit_rxon(priv);
            }
      }
      mutex_unlock(&priv->mutex);

      return count;
}

static DEVICE_ATTR(flags, S_IWUSR | S_IRUGO, show_flags, store_flags);

static ssize_t show_filter_flags(struct device *d,
                         struct device_attribute *attr, char *buf)
{
      struct iwl_priv *priv = dev_get_drvdata(d);

      return sprintf(buf, "0x%04X\n",
            le32_to_cpu(priv->active_rxon.filter_flags));
}

static ssize_t store_filter_flags(struct device *d,
                          struct device_attribute *attr,
                          const char *buf, size_t count)
{
      struct iwl_priv *priv = dev_get_drvdata(d);
      unsigned long val;
      u32 filter_flags;
      int ret = strict_strtoul(buf, 0, &val);
      if (ret)
            return ret;
      filter_flags = (u32)val;

      mutex_lock(&priv->mutex);
      if (le32_to_cpu(priv->staging_rxon.filter_flags) != filter_flags) {
            /* Cancel any currently running scans... */
            if (iwl_scan_cancel_timeout(priv, 100))
                  IWL_WARN(priv, "Could not cancel scan.\n");
            else {
                  IWL_DEBUG_INFO(priv, "Committing rxon.filter_flags = "
                               "0x%04X\n", filter_flags);
                  priv->staging_rxon.filter_flags =
                        cpu_to_le32(filter_flags);
                  iwlcore_commit_rxon(priv);
            }
      }
      mutex_unlock(&priv->mutex);

      return count;
}

static DEVICE_ATTR(filter_flags, S_IWUSR | S_IRUGO, show_filter_flags,
               store_filter_flags);

static ssize_t store_power_level(struct device *d,
                         struct device_attribute *attr,
                         const char *buf, size_t count)
{
      struct iwl_priv *priv = dev_get_drvdata(d);
      int ret;
      unsigned long mode;


      mutex_lock(&priv->mutex);

      ret = strict_strtoul(buf, 10, &mode);
      if (ret)
            goto out;

      ret = iwl_power_set_user_mode(priv, mode);
      if (ret) {
            IWL_DEBUG_MAC80211(priv, "failed setting power mode.\n");
            goto out;
      }
      ret = count;

 out:
      mutex_unlock(&priv->mutex);
      return ret;
}

static ssize_t show_power_level(struct device *d,
                        struct device_attribute *attr, char *buf)
{
      struct iwl_priv *priv = dev_get_drvdata(d);
      int level = priv->power_data.power_mode;
      char *p = buf;

      p += sprintf(p, "%d\n", level);
      return p - buf + 1;
}

static DEVICE_ATTR(power_level, S_IWUSR | S_IRUSR, show_power_level,
               store_power_level);

static ssize_t show_qos(struct device *d,
                        struct device_attribute *attr, char *buf)
{
      struct iwl_priv *priv = dev_get_drvdata(d);
      char *p = buf;
      int   q;

      for (q = 0; q < AC_NUM; q++) {
            p += sprintf(p, "\tcw_min\tcw_max\taifsn\ttxop\n");
            p += sprintf(p, "AC[%d]\t%u\t%u\t%u\t%u\n", q,
                       priv->qos_data.def_qos_parm.ac[q].cw_min,
                       priv->qos_data.def_qos_parm.ac[q].cw_max,
                       priv->qos_data.def_qos_parm.ac[q].aifsn,
                       priv->qos_data.def_qos_parm.ac[q].edca_txop);
      }

      return p - buf + 1;
}

static DEVICE_ATTR(qos, S_IRUGO, show_qos, NULL);

static ssize_t show_statistics(struct device *d,
                         struct device_attribute *attr, char *buf)
{
      struct iwl_priv *priv = dev_get_drvdata(d);
      u32 size = sizeof(struct iwl_notif_statistics);
      u32 len = 0, ofs = 0;
      u8 *data = (u8 *)&priv->statistics;
      int rc = 0;

      if (!iwl_is_alive(priv))
            return -EAGAIN;

      mutex_lock(&priv->mutex);
      rc = iwl_send_statistics_request(priv, 0);
      mutex_unlock(&priv->mutex);

      if (rc) {
            len = sprintf(buf,
                        "Error sending statistics request: 0x%08X\n", rc);
            return len;
      }

      while (size && (PAGE_SIZE - len)) {
            hex_dump_to_buffer(data + ofs, size, 16, 1, buf + len,
                           PAGE_SIZE - len, 1);
            len = strlen(buf);
            if (PAGE_SIZE - len)
                  buf[len++] = '\n';

            ofs += 16;
            size -= min(size, 16U);
      }

      return len;
}

static DEVICE_ATTR(statistics, S_IRUGO, show_statistics, NULL);


/*****************************************************************************
 *
 * driver setup and teardown
 *
 *****************************************************************************/

static void iwl_setup_deferred_work(struct iwl_priv *priv)
{
      priv->workqueue = create_singlethread_workqueue(DRV_NAME);

      init_waitqueue_head(&priv->wait_command_queue);

      INIT_WORK(&priv->up, iwl_bg_up);
      INIT_WORK(&priv->restart, iwl_bg_restart);
      INIT_WORK(&priv->rx_replenish, iwl_bg_rx_replenish);
      INIT_WORK(&priv->beacon_update, iwl_bg_beacon_update);
      INIT_WORK(&priv->run_time_calib_work, iwl_bg_run_time_calib_work);
      INIT_DELAYED_WORK(&priv->init_alive_start, iwl_bg_init_alive_start);
      INIT_DELAYED_WORK(&priv->alive_start, iwl_bg_alive_start);

      iwl_setup_scan_deferred_work(priv);

      if (priv->cfg->ops->lib->setup_deferred_work)
            priv->cfg->ops->lib->setup_deferred_work(priv);

      init_timer(&priv->statistics_periodic);
      priv->statistics_periodic.data = (unsigned long)priv;
      priv->statistics_periodic.function = iwl_bg_statistics_periodic;

      if (!priv->cfg->use_isr_legacy)
            tasklet_init(&priv->irq_tasklet, (void (*)(unsigned long))
                  iwl_irq_tasklet, (unsigned long)priv);
      else
            tasklet_init(&priv->irq_tasklet, (void (*)(unsigned long))
                  iwl_irq_tasklet_legacy, (unsigned long)priv);
}

static void iwl_cancel_deferred_work(struct iwl_priv *priv)
{
      if (priv->cfg->ops->lib->cancel_deferred_work)
            priv->cfg->ops->lib->cancel_deferred_work(priv);

      cancel_delayed_work_sync(&priv->init_alive_start);
      cancel_delayed_work(&priv->scan_check);
      cancel_delayed_work(&priv->alive_start);
      cancel_work_sync(&priv->beacon_update);
      del_timer_sync(&priv->statistics_periodic);
}

static struct attribute *iwl_sysfs_entries[] = {
      &dev_attr_flags.attr,
      &dev_attr_filter_flags.attr,
      &dev_attr_power_level.attr,
      &dev_attr_statistics.attr,
      &dev_attr_temperature.attr,
      &dev_attr_tx_power.attr,
#ifdef CONFIG_IWLWIFI_DEBUG
      &dev_attr_debug_level.attr,
#endif
      &dev_attr_version.attr,
      &dev_attr_qos.attr,
      NULL
};

static struct attribute_group iwl_attribute_group = {
      .name = NULL,           /* put in device directory */
      .attrs = iwl_sysfs_entries,
};

static struct ieee80211_ops iwl_hw_ops = {
      .tx = iwl_mac_tx,
      .start = iwl_mac_start,
      .stop = iwl_mac_stop,
      .add_interface = iwl_mac_add_interface,
      .remove_interface = iwl_mac_remove_interface,
      .config = iwl_mac_config,
      .configure_filter = iwl_configure_filter,
      .set_key = iwl_mac_set_key,
      .update_tkip_key = iwl_mac_update_tkip_key,
      .get_stats = iwl_mac_get_stats,
      .get_tx_stats = iwl_mac_get_tx_stats,
      .conf_tx = iwl_mac_conf_tx,
      .reset_tsf = iwl_mac_reset_tsf,
      .bss_info_changed = iwl_bss_info_changed,
      .ampdu_action = iwl_mac_ampdu_action,
      .hw_scan = iwl_mac_hw_scan
};

static int iwl_pci_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
{
      int err = 0;
      struct iwl_priv *priv;
      struct ieee80211_hw *hw;
      struct iwl_cfg *cfg = (struct iwl_cfg *)(ent->driver_data);
      unsigned long flags;
      u16 pci_cmd;

      /************************
       * 1. Allocating HW data
       ************************/

      /* Disabling hardware scan means that mac80211 will perform scans
       * "the hard way", rather than using device's scan. */
      if (cfg->mod_params->disable_hw_scan) {
            if (cfg->mod_params->debug & IWL_DL_INFO)
                  dev_printk(KERN_DEBUG, &(pdev->dev),
                           "Disabling hw_scan\n");
            iwl_hw_ops.hw_scan = NULL;
      }

      hw = iwl_alloc_all(cfg, &iwl_hw_ops);
      if (!hw) {
            err = -ENOMEM;
            goto out;
      }
      priv = hw->priv;
      /* At this point both hw and priv are allocated. */

      SET_IEEE80211_DEV(hw, &pdev->dev);

      IWL_DEBUG_INFO(priv, "*** LOAD DRIVER ***\n");
      priv->cfg = cfg;
      priv->pci_dev = pdev;
      priv->inta_mask = CSR_INI_SET_MASK;

#ifdef CONFIG_IWLWIFI_DEBUG
      priv->debug_level = priv->cfg->mod_params->debug;
      atomic_set(&priv->restrict_refcnt, 0);
#endif

      /**************************
       * 2. Initializing PCI bus
       **************************/
      if (pci_enable_device(pdev)) {
            err = -ENODEV;
            goto out_ieee80211_free_hw;
      }

      pci_set_master(pdev);

      err = pci_set_dma_mask(pdev, DMA_BIT_MASK(36));
      if (!err)
            err = pci_set_consistent_dma_mask(pdev, DMA_BIT_MASK(36));
      if (err) {
            err = pci_set_dma_mask(pdev, DMA_BIT_MASK(32));
            if (!err)
                  err = pci_set_consistent_dma_mask(pdev, DMA_BIT_MASK(32));
            /* both attempts failed: */
            if (err) {
                  IWL_WARN(priv, "No suitable DMA available.\n");
                  goto out_pci_disable_device;
            }
      }

      err = pci_request_regions(pdev, DRV_NAME);
      if (err)
            goto out_pci_disable_device;

      pci_set_drvdata(pdev, priv);


      /***********************
       * 3. Read REV register
       ***********************/
      priv->hw_base = pci_iomap(pdev, 0, 0);
      if (!priv->hw_base) {
            err = -ENODEV;
            goto out_pci_release_regions;
      }

      IWL_DEBUG_INFO(priv, "pci_resource_len = 0x%08llx\n",
            (unsigned long long) pci_resource_len(pdev, 0));
      IWL_DEBUG_INFO(priv, "pci_resource_base = %p\n", priv->hw_base);

      /* this spin lock will be used in apm_ops.init and EEPROM access
       * we should init now
       */
      spin_lock_init(&priv->reg_lock);
      iwl_hw_detect(priv);
      IWL_INFO(priv, "Detected Intel Wireless WiFi Link %s REV=0x%X\n",
            priv->cfg->name, priv->hw_rev);

      /* We disable the RETRY_TIMEOUT register (0x41) to keep
       * PCI Tx retries from interfering with C3 CPU state */
      pci_write_config_byte(pdev, PCI_CFG_RETRY_TIMEOUT, 0x00);

      iwl_prepare_card_hw(priv);
      if (!priv->hw_ready) {
            IWL_WARN(priv, "Failed, HW not ready\n");
            goto out_iounmap;
      }

      /* amp init */
      err = priv->cfg->ops->lib->apm_ops.init(priv);
      if (err < 0) {
            IWL_ERR(priv, "Failed to init APMG\n");
            goto out_iounmap;
      }
      /*****************
       * 4. Read EEPROM
       *****************/
      /* Read the EEPROM */
      err = iwl_eeprom_init(priv);
      if (err) {
            IWL_ERR(priv, "Unable to init EEPROM\n");
            goto out_iounmap;
      }
      err = iwl_eeprom_check_version(priv);
      if (err)
            goto out_free_eeprom;

      /* extract MAC Address */
      iwl_eeprom_get_mac(priv, priv->mac_addr);
      IWL_DEBUG_INFO(priv, "MAC address: %pM\n", priv->mac_addr);
      SET_IEEE80211_PERM_ADDR(priv->hw, priv->mac_addr);

      /************************
       * 5. Setup HW constants
       ************************/
      if (iwl_set_hw_params(priv)) {
            IWL_ERR(priv, "failed to set hw parameters\n");
            goto out_free_eeprom;
      }

      /*******************
       * 6. Setup priv
       *******************/

      err = iwl_init_drv(priv);
      if (err)
            goto out_free_eeprom;
      /* At this point both hw and priv are initialized. */

      /********************
       * 7. Setup services
       ********************/
      spin_lock_irqsave(&priv->lock, flags);
      iwl_disable_interrupts(priv);
      spin_unlock_irqrestore(&priv->lock, flags);

      pci_enable_msi(priv->pci_dev);

      iwl_alloc_isr_ict(priv);
      err = request_irq(priv->pci_dev->irq, priv->cfg->ops->lib->isr,
                    IRQF_SHARED, DRV_NAME, priv);
      if (err) {
            IWL_ERR(priv, "Error allocating IRQ %d\n", priv->pci_dev->irq);
            goto out_disable_msi;
      }
      err = sysfs_create_group(&pdev->dev.kobj, &iwl_attribute_group);
      if (err) {
            IWL_ERR(priv, "failed to create sysfs device attributes\n");
            goto out_free_irq;
      }

      iwl_setup_deferred_work(priv);
      iwl_setup_rx_handlers(priv);

      /**********************************
       * 8. Setup and register mac80211
       **********************************/

      /* enable interrupts if needed: hw bug w/a */
      pci_read_config_word(priv->pci_dev, PCI_COMMAND, &pci_cmd);
      if (pci_cmd & PCI_COMMAND_INTX_DISABLE) {
            pci_cmd &= ~PCI_COMMAND_INTX_DISABLE;
            pci_write_config_word(priv->pci_dev, PCI_COMMAND, pci_cmd);
      }

      iwl_enable_interrupts(priv);

      err = iwl_setup_mac(priv);
      if (err)
            goto out_remove_sysfs;

      err = iwl_dbgfs_register(priv, DRV_NAME);
      if (err)
            IWL_ERR(priv, "failed to create debugfs files. Ignoring error: %d\n", err);

      /* If platform's RF_KILL switch is NOT set to KILL */
      if (iwl_read32(priv, CSR_GP_CNTRL) & CSR_GP_CNTRL_REG_FLAG_HW_RF_KILL_SW)
            clear_bit(STATUS_RF_KILL_HW, &priv->status);
      else
            set_bit(STATUS_RF_KILL_HW, &priv->status);

      wiphy_rfkill_set_hw_state(priv->hw->wiphy,
            test_bit(STATUS_RF_KILL_HW, &priv->status));

      iwl_power_initialize(priv);
      return 0;

 out_remove_sysfs:
      destroy_workqueue(priv->workqueue);
      priv->workqueue = NULL;
      sysfs_remove_group(&pdev->dev.kobj, &iwl_attribute_group);
 out_free_irq:
      free_irq(priv->pci_dev->irq, priv);
      iwl_free_isr_ict(priv);
 out_disable_msi:
      pci_disable_msi(priv->pci_dev);
      iwl_uninit_drv(priv);
 out_free_eeprom:
      iwl_eeprom_free(priv);
 out_iounmap:
      pci_iounmap(pdev, priv->hw_base);
 out_pci_release_regions:
      pci_set_drvdata(pdev, NULL);
      pci_release_regions(pdev);
 out_pci_disable_device:
      pci_disable_device(pdev);
 out_ieee80211_free_hw:
      ieee80211_free_hw(priv->hw);
 out:
      return err;
}

static void __devexit iwl_pci_remove(struct pci_dev *pdev)
{
      struct iwl_priv *priv = pci_get_drvdata(pdev);
      unsigned long flags;

      if (!priv)
            return;

      IWL_DEBUG_INFO(priv, "*** UNLOAD DRIVER ***\n");

      iwl_dbgfs_unregister(priv);
      sysfs_remove_group(&pdev->dev.kobj, &iwl_attribute_group);

      /* ieee80211_unregister_hw call wil cause iwl_mac_stop to
       * to be called and iwl_down since we are removing the device
       * we need to set STATUS_EXIT_PENDING bit.
       */
      set_bit(STATUS_EXIT_PENDING, &priv->status);
      if (priv->mac80211_registered) {
            ieee80211_unregister_hw(priv->hw);
            priv->mac80211_registered = 0;
      } else {
            iwl_down(priv);
      }

      /* make sure we flush any pending irq or
       * tasklet for the driver
       */
      spin_lock_irqsave(&priv->lock, flags);
      iwl_disable_interrupts(priv);
      spin_unlock_irqrestore(&priv->lock, flags);

      iwl_synchronize_irq(priv);

      iwl_dealloc_ucode_pci(priv);

      if (priv->rxq.bd)
            iwl_rx_queue_free(priv, &priv->rxq);
      iwl_hw_txq_ctx_free(priv);

      iwl_clear_stations_table(priv);
      iwl_eeprom_free(priv);


      /*netif_stop_queue(dev); */
      flush_workqueue(priv->workqueue);

      /* ieee80211_unregister_hw calls iwl_mac_stop, which flushes
       * priv->workqueue... so we can't take down the workqueue
       * until now... */
      destroy_workqueue(priv->workqueue);
      priv->workqueue = NULL;

      free_irq(priv->pci_dev->irq, priv);
      pci_disable_msi(priv->pci_dev);
      pci_iounmap(pdev, priv->hw_base);
      pci_release_regions(pdev);
      pci_disable_device(pdev);
      pci_set_drvdata(pdev, NULL);

      iwl_uninit_drv(priv);

      iwl_free_isr_ict(priv);

      if (priv->ibss_beacon)
            dev_kfree_skb(priv->ibss_beacon);

      ieee80211_free_hw(priv->hw);
}


/*****************************************************************************
 *
 * driver and module entry point
 *
 *****************************************************************************/

/* Hardware specific file defines the PCI IDs table for that hardware module */
static struct pci_device_id iwl_hw_card_ids[] = {
#ifdef CONFIG_IWL4965
      {IWL_PCI_DEVICE(0x4229, PCI_ANY_ID, iwl4965_agn_cfg)},
      {IWL_PCI_DEVICE(0x4230, PCI_ANY_ID, iwl4965_agn_cfg)},
#endif /* CONFIG_IWL4965 */
#ifdef CONFIG_IWL5000
      {IWL_PCI_DEVICE(0x4232, 0x1205, iwl5100_bg_cfg)},
      {IWL_PCI_DEVICE(0x4232, 0x1305, iwl5100_bg_cfg)},
      {IWL_PCI_DEVICE(0x4232, 0x1206, iwl5100_abg_cfg)},
      {IWL_PCI_DEVICE(0x4232, 0x1306, iwl5100_abg_cfg)},
      {IWL_PCI_DEVICE(0x4232, 0x1326, iwl5100_abg_cfg)},
      {IWL_PCI_DEVICE(0x4237, 0x1216, iwl5100_abg_cfg)},
      {IWL_PCI_DEVICE(0x4232, PCI_ANY_ID, iwl5100_agn_cfg)},
      {IWL_PCI_DEVICE(0x4235, PCI_ANY_ID, iwl5300_agn_cfg)},
      {IWL_PCI_DEVICE(0x4236, PCI_ANY_ID, iwl5300_agn_cfg)},
      {IWL_PCI_DEVICE(0x4237, PCI_ANY_ID, iwl5100_agn_cfg)},
/* 5350 WiFi/WiMax */
      {IWL_PCI_DEVICE(0x423A, 0x1001, iwl5350_agn_cfg)},
      {IWL_PCI_DEVICE(0x423A, 0x1021, iwl5350_agn_cfg)},
      {IWL_PCI_DEVICE(0x423B, 0x1011, iwl5350_agn_cfg)},
/* 5150 Wifi/WiMax */
      {IWL_PCI_DEVICE(0x423C, PCI_ANY_ID, iwl5150_agn_cfg)},
      {IWL_PCI_DEVICE(0x423D, PCI_ANY_ID, iwl5150_agn_cfg)},
/* 6000/6050 Series */
      {IWL_PCI_DEVICE(0x0082, 0x1102, iwl6000_2ag_cfg)},
      {IWL_PCI_DEVICE(0x0085, 0x1112, iwl6000_2ag_cfg)},
      {IWL_PCI_DEVICE(0x0082, 0x1122, iwl6000_2ag_cfg)},
      {IWL_PCI_DEVICE(0x422B, PCI_ANY_ID, iwl6000_3agn_cfg)},
      {IWL_PCI_DEVICE(0x422C, PCI_ANY_ID, iwl6000_2agn_cfg)},
      {IWL_PCI_DEVICE(0x4238, PCI_ANY_ID, iwl6000_3agn_cfg)},
      {IWL_PCI_DEVICE(0x4239, PCI_ANY_ID, iwl6000_2agn_cfg)},
      {IWL_PCI_DEVICE(0x0082, PCI_ANY_ID, iwl6000_2agn_cfg)},
      {IWL_PCI_DEVICE(0x0085, PCI_ANY_ID, iwl6000_3agn_cfg)},
      {IWL_PCI_DEVICE(0x0086, PCI_ANY_ID, iwl6050_3agn_cfg)},
      {IWL_PCI_DEVICE(0x0087, PCI_ANY_ID, iwl6050_2agn_cfg)},
      {IWL_PCI_DEVICE(0x0088, PCI_ANY_ID, iwl6050_3agn_cfg)},
      {IWL_PCI_DEVICE(0x0089, PCI_ANY_ID, iwl6050_2agn_cfg)},
/* 1000 Series WiFi */
      {IWL_PCI_DEVICE(0x0083, PCI_ANY_ID, iwl1000_bgn_cfg)},
      {IWL_PCI_DEVICE(0x0084, PCI_ANY_ID, iwl1000_bgn_cfg)},
#endif /* CONFIG_IWL5000 */

      {0}
};
MODULE_DEVICE_TABLE(pci, iwl_hw_card_ids);

static struct pci_driver iwl_driver = {
      .name = DRV_NAME,
      .id_table = iwl_hw_card_ids,
      .probe = iwl_pci_probe,
      .remove = __devexit_p(iwl_pci_remove),
#ifdef CONFIG_PM
      .suspend = iwl_pci_suspend,
      .resume = iwl_pci_resume,
#endif
};

static int __init iwl_init(void)
{

      int ret;
      printk(KERN_INFO DRV_NAME ": " DRV_DESCRIPTION ", " DRV_VERSION "\n");
      printk(KERN_INFO DRV_NAME ": " DRV_COPYRIGHT "\n");

      ret = iwlagn_rate_control_register();
      if (ret) {
            printk(KERN_ERR DRV_NAME
                   "Unable to register rate control algorithm: %d\n", ret);
            return ret;
      }

      ret = pci_register_driver(&iwl_driver);
      if (ret) {
            printk(KERN_ERR DRV_NAME "Unable to initialize PCI module\n");
            goto error_register;
      }

      return ret;

error_register:
      iwlagn_rate_control_unregister();
      return ret;
}

static void __exit iwl_exit(void)
{
      pci_unregister_driver(&iwl_driver);
      iwlagn_rate_control_unregister();
}

module_exit(iwl_exit);
module_init(iwl_init);

Generated by  Doxygen 1.6.0   Back to index