/******************************************************************************
 *
 * Copyright(c) 2003 - 2011 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
 *
 *****************************************************************************/

#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/pci.h>
#include <linux/pci-aspm.h>
#include <linux/slab.h>
#include <linux/dma-mapping.h>
#include <linux/delay.h>
#include <linux/sched.h>
#include <linux/skbuff.h>
#include <linux/netdevice.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        "iwl4965"

#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-4965-calib.h"
#include "iwl-4965.h"
#include "iwl-4965-led.h"


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

/*
 * module name, copyright, version, etc.
 */
#define DRV_DESCRIPTION "Intel(R) Wireless WiFi 4965 driver for Linux"

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

#define DRV_VERSION     IWLWIFI_VERSION VD


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

void iwl4965_update_chain_flags(struct iwl_priv *priv)
{
        struct iwl_rxon_context *ctx;

        if (priv->cfg->ops->hcmd->set_rxon_chain) {
                for_each_context(priv, ctx) {
                        priv->cfg->ops->hcmd->set_rxon_chain(priv, ctx);
                        if (ctx->active.rx_chain != ctx->staging.rx_chain)
                                iwl_legacy_commit_rxon(priv, ctx);
                }
        }
}

static void iwl4965_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 *iwl4965_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 iwl4965_free_frame(struct iwl_priv *priv, struct iwl_frame *frame)
{
        memset(frame, 0, sizeof(*frame));
        list_add(&frame->list, &priv->free_frames);
}

static u32 iwl4965_fill_beacon_frame(struct iwl_priv *priv,
                                 struct ieee80211_hdr *hdr,
                                 int left)
{
        lockdep_assert_held(&priv->mutex);

        if (!priv->beacon_skb)
                return 0;

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

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

        return priv->beacon_skb->len;
}

/* Parse the beacon frame to find the TIM element and set tim_idx & tim_size */
static void iwl4965_set_beacon_tim(struct iwl_priv *priv,
                               struct iwl_tx_beacon_cmd *tx_beacon_cmd,
                               u8 *beacon, u32 frame_size)
{
        u16 tim_idx;
        struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *)beacon;

        /*
         * The index is relative to frame start but we start looking at the
         * variable-length part of the beacon.
         */
        tim_idx = mgmt->u.beacon.variable - beacon;

        /* Parse variable-length elements of beacon to find WLAN_EID_TIM */
        while ((tim_idx < (frame_size - 2)) &&
                        (beacon[tim_idx] != WLAN_EID_TIM))
                tim_idx += beacon[tim_idx+1] + 2;

        /* If TIM field was found, set variables */
        if ((tim_idx < (frame_size - 1)) && (beacon[tim_idx] == WLAN_EID_TIM)) {
                tx_beacon_cmd->tim_idx = cpu_to_le16(tim_idx);
                tx_beacon_cmd->tim_size = beacon[tim_idx+1];
        } else
                IWL_WARN(priv, "Unable to find TIM Element in beacon\n");
}

static unsigned int iwl4965_hw_get_beacon_cmd(struct iwl_priv *priv,
                                       struct iwl_frame *frame)
{
        struct iwl_tx_beacon_cmd *tx_beacon_cmd;
        u32 frame_size;
        u32 rate_flags;
        u32 rate;
        /*
         * We have to set up the TX command, the TX Beacon command, and the
         * beacon contents.
         */

        lockdep_assert_held(&priv->mutex);

        if (!priv->beacon_ctx) {
                IWL_ERR(priv, "trying to build beacon w/o beacon context!\n");
                return 0;
        }

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

        /* Set up TX beacon contents */
        frame_size = iwl4965_fill_beacon_frame(priv, tx_beacon_cmd->frame,
                                sizeof(frame->u) - sizeof(*tx_beacon_cmd));
        if (WARN_ON_ONCE(frame_size > MAX_MPDU_SIZE))
                return 0;
        if (!frame_size)
                return 0;

        /* Set up TX command fields */
        tx_beacon_cmd->tx.len = cpu_to_le16((u16)frame_size);
        tx_beacon_cmd->tx.sta_id = priv->beacon_ctx->bcast_sta_id;
        tx_beacon_cmd->tx.stop_time.life_time = TX_CMD_LIFE_TIME_INFINITE;
        tx_beacon_cmd->tx.tx_flags = TX_CMD_FLG_SEQ_CTL_MSK |
                TX_CMD_FLG_TSF_MSK | TX_CMD_FLG_STA_RATE_MSK;

        /* Set up TX beacon command fields */
        iwl4965_set_beacon_tim(priv, tx_beacon_cmd, (u8 *)tx_beacon_cmd->frame,
                           frame_size);

        /* Set up packet rate and flags */
        rate = iwl_legacy_get_lowest_plcp(priv, priv->beacon_ctx);
        priv->mgmt_tx_ant = iwl4965_toggle_tx_ant(priv, priv->mgmt_tx_ant,
                                              priv->hw_params.valid_tx_ant);
        rate_flags = iwl4965_ant_idx_to_flags(priv->mgmt_tx_ant);
        if ((rate >= IWL_FIRST_CCK_RATE) && (rate <= IWL_LAST_CCK_RATE))
                rate_flags |= RATE_MCS_CCK_MSK;
        tx_beacon_cmd->tx.rate_n_flags = iwl4965_hw_set_rate_n_flags(rate,
                        rate_flags);

        return sizeof(*tx_beacon_cmd) + frame_size;
}

int iwl4965_send_beacon_cmd(struct iwl_priv *priv)
{
        struct iwl_frame *frame;
        unsigned int frame_size;
        int rc;

        frame = iwl4965_get_free_frame(priv);
        if (!frame) {
                IWL_ERR(priv, "Could not obtain free frame buffer for beacon "
                          "command.\n");
                return -ENOMEM;
        }

        frame_size = iwl4965_hw_get_beacon_cmd(priv, frame);
        if (!frame_size) {
                IWL_ERR(priv, "Error configuring the beacon command\n");
                iwl4965_free_frame(priv, frame);
                return -EINVAL;
        }

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

        iwl4965_free_frame(priv, frame);

        return rc;
}

static inline dma_addr_t iwl4965_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 iwl4965_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 iwl4965_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 iwl4965_tfd_get_num_tbs(struct iwl_tfd *tfd)
{
        return tfd->num_tbs & 0x1f;
}

/**
 * iwl4965_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 iwl4965_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 = iwl4965_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,
                                dma_unmap_addr(&txq->meta[index], mapping),
                                dma_unmap_len(&txq->meta[index], len),
                                PCI_DMA_BIDIRECTIONAL);

        /* Unmap chunks, if any. */
        for (i = 1; i < num_tbs; i++)
                pci_unmap_single(dev, iwl4965_tfd_tb_get_addr(tfd, i),
                                iwl4965_tfd_tb_get_len(tfd, i),
                                PCI_DMA_TODEVICE);

        /* free SKB */
        if (txq->txb) {
                struct sk_buff *skb;

                skb = txq->txb[txq->q.read_ptr].skb;

                /* can be called from irqs-disabled context */
                if (skb) {
                        dev_kfree_skb_any(skb);
                        txq->txb[txq->q.read_ptr].skb = NULL;
                }
        }
}

int iwl4965_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 = iwl4965_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);

        iwl4965_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 iwl4965_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_legacy_write_direct32(priv, FH_MEM_CBBC_QUEUE(txq_id),
                             txq->q.dma_addr >> 8);

        return 0;
}

/******************************************************************************
 *
 * Generic RX handler implementations
 *
 ******************************************************************************/
static void iwl4965_rx_reply_alive(struct iwl_priv *priv,
                                struct iwl_rx_mem_buffer *rxb)
{
        struct iwl_rx_packet *pkt = rxb_addr(rxb);
        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");
}

/**
 * iwl4965_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 iwl4965_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_legacy_is_ready_rf(priv))
                return;

        iwl_legacy_send_statistics_request(priv, CMD_ASYNC, false);
}

static void iwl4965_rx_beacon_notif(struct iwl_priv *priv,
                                struct iwl_rx_mem_buffer *rxb)
{
        struct iwl_rx_packet *pkt = rxb_addr(rxb);
        struct iwl4965_beacon_notif *beacon =
                (struct iwl4965_beacon_notif *)pkt->u.raw;
#ifdef CONFIG_IWLWIFI_LEGACY_DEBUG
        u8 rate = iwl4965_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

        priv->ibss_manager = le32_to_cpu(beacon->ibss_mgr_status);
}

static void iwl4965_perform_ct_kill_task(struct iwl_priv *priv)
{
        unsigned long flags;

        IWL_DEBUG_POWER(priv, "Stop all queues\n");

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

        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, flags);
        if (!iwl_grab_nic_access(priv))
                iwl_release_nic_access(priv);
        spin_unlock_irqrestore(&priv->reg_lock, flags);
}

/* Handle notification from uCode that card's power state is changing
 * due to software, hardware, or critical temperature RFKILL */
static void iwl4965_rx_card_state_notif(struct iwl_priv *priv,
                                    struct iwl_rx_mem_buffer *rxb)
{
        struct iwl_rx_packet *pkt = rxb_addr(rxb);
        u32 flags = le32_to_cpu(pkt->u.card_state_notif.flags);
        unsigned long status = priv->status;

        IWL_DEBUG_RF_KILL(priv, "Card state received: HW:%s SW:%s CT:%s\n",
                          (flags & HW_CARD_DISABLED) ? "Kill" : "On",
                          (flags & SW_CARD_DISABLED) ? "Kill" : "On",
                          (flags & CT_CARD_DISABLED) ?
                          "Reached" : "Not reached");

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

                iwl_write32(priv, CSR_UCODE_DRV_GP1_SET,
                            CSR_UCODE_DRV_GP1_BIT_CMD_BLOCKED);

                iwl_legacy_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_legacy_write_direct32(priv, HBUS_TARG_MBX_C,
                                        HBUS_TARG_MBX_C_REG_BIT_CMD_BLOCKED);
                }
        }

        if (flags & CT_CARD_DISABLED)
                iwl4965_perform_ct_kill_task(priv);

        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_legacy_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(&priv->wait_command_queue);
}

/**
 * iwl4965_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 iwl4965_setup_rx_handlers(struct iwl_priv *priv)
{
        priv->rx_handlers[REPLY_ALIVE] = iwl4965_rx_reply_alive;
        priv->rx_handlers[REPLY_ERROR] = iwl_legacy_rx_reply_error;
        priv->rx_handlers[CHANNEL_SWITCH_NOTIFICATION] = iwl_legacy_rx_csa;
        priv->rx_handlers[SPECTRUM_MEASURE_NOTIFICATION] =
                        iwl_legacy_rx_spectrum_measure_notif;
        priv->rx_handlers[PM_SLEEP_NOTIFICATION] = iwl_legacy_rx_pm_sleep_notif;
        priv->rx_handlers[PM_DEBUG_STATISTIC_NOTIFIC] =
            iwl_legacy_rx_pm_debug_statistics_notif;
        priv->rx_handlers[BEACON_NOTIFICATION] = iwl4965_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] = iwl4965_reply_statistics;
        priv->rx_handlers[STATISTICS_NOTIFICATION] = iwl4965_rx_statistics;

        iwl_legacy_setup_rx_scan_handlers(priv);

        /* status change handler */
        priv->rx_handlers[CARD_STATE_NOTIFICATION] =
                                        iwl4965_rx_card_state_notif;

        priv->rx_handlers[MISSED_BEACONS_NOTIFICATION] =
            iwl4965_rx_missed_beacon_notif;
        /* Rx handlers */
        priv->rx_handlers[REPLY_RX_PHY_CMD] = iwl4965_rx_reply_rx_phy;
        priv->rx_handlers[REPLY_RX_MPDU_CMD] = iwl4965_rx_reply_rx;
        /* block ack */
        priv->rx_handlers[REPLY_COMPRESSED_BA] = iwl4965_rx_reply_compressed_ba;
        /* Set up hardware specific Rx handlers */
        priv->cfg->ops->lib->rx_handler_setup(priv);
}

/**
 * iwl4965_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 iwl4965_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 - 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) {
                int len;

                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_page(priv->pci_dev, rxb->page_dma,
                               PAGE_SIZE << priv->hw_params.rx_page_order,
                               PCI_DMA_FROMDEVICE);
                pkt = rxb_addr(rxb);

                len = le32_to_cpu(pkt->len_n_flags) & FH_RSCSR_FRAME_SIZE_MSK;
                len += sizeof(u32); /* account for status word */
                trace_iwlwifi_legacy_dev_rx(priv, pkt, len);

                /* 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 iwl4965_setup_rx_handlers() */
                if (priv->rx_handlers[pkt->hdr.cmd]) {
                        IWL_DEBUG_RX(priv, "r = %d, i = %d, %s, 0x%02x\n", r,
                                i, iwl_legacy_get_cmd_string(pkt->hdr.cmd),
                                pkt->hdr.cmd);
                        priv->isr_stats.rx_handlers[pkt->hdr.cmd]++;
                        priv->rx_handlers[pkt->hdr.cmd] (priv, rxb);
                } else {
                        /* No handling needed */
                        IWL_DEBUG_RX(priv,
                                "r %d i %d No handler needed for %s, 0x%02x\n",
                                r, i, iwl_legacy_get_cmd_string(pkt->hdr.cmd),
                                pkt->hdr.cmd);
                }

                /*
                 * XXX: After here, we should always check rxb->page
                 * against NULL before touching it or its virtual
                 * memory (pkt). Because some rx_handler might have
                 * already taken or freed the pages.
                 */

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

                /* Reuse the page if possible. For notification packets and
                 * SKBs that fail to Rx correctly, add them back into the
                 * rx_free list for reuse later. */
                spin_lock_irqsave(&rxq->lock, flags);
                if (rxb->page != NULL) {
                        rxb->page_dma = pci_map_page(priv->pci_dev, rxb->page,
                                0, PAGE_SIZE << priv->hw_params.rx_page_order,
                                PCI_DMA_FROMDEVICE);
                        list_add_tail(&rxb->list, &rxq->rx_free);
                        rxq->free_count++;
                } else
                        list_add_tail(&rxb->list, &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) {
                                rxq->read = i;
                                iwl4965_rx_replenish_now(priv);
                                count = 0;
                        }
                }
        }

        /* Backtrack one entry */
        rxq->read = i;
        if (fill_rx)
                iwl4965_rx_replenish_now(priv);
        else
                iwl4965_rx_queue_restock(priv);
}

/* call this function to flush any scheduled tasklet */
static inline void iwl4965_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 iwl4965_irq_tasklet(struct iwl_priv *priv)
{
        u32 inta, handled = 0;
        u32 inta_fh;
        unsigned long flags;
        u32 i;
#ifdef CONFIG_IWLWIFI_LEGACY_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_LEGACY_DEBUG
        if (iwl_legacy_get_debug_level(priv) & 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

        spin_unlock_irqrestore(&priv->lock, flags);

        /* 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, "Hardware error detected.  Restarting.\n");

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

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

                handled |= CSR_INT_BIT_HW_ERR;

                return;
        }

#ifdef CONFIG_IWLWIFI_LEGACY_DEBUG
        if (iwl_legacy_get_debug_level(priv) & (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_WARN(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++;
                iwl_legacy_irq_handle_error(priv);
                handled |= CSR_INT_BIT_SW_ERR;
        }

        /*
         * uCode wakes up after power-down sleep.
         * Tell device about any new tx or host commands enqueued,
         * and about any Rx buffers made available while asleep.
         */
        if (inta & CSR_INT_BIT_WAKEUP) {
                IWL_DEBUG_ISR(priv, "Wakeup interrupt\n");
                iwl_legacy_rx_queue_update_write_ptr(priv, &priv->rxq);
                for (i = 0; i < priv->hw_params.max_txq_num; i++)
                        iwl_legacy_txq_update_write_ptr(priv, &priv->txq[i]);
                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)) {
                iwl4965_rx_handle(priv);
                priv->isr_stats.rx++;
                handled |= (CSR_INT_BIT_FH_RX | CSR_INT_BIT_SW_RX);
        }

        /* This "Tx" DMA channel is used only for loading uCode */
        if (inta & CSR_INT_BIT_FH_TX) {
                IWL_DEBUG_ISR(priv, "uCode load interrupt\n");
                priv->isr_stats.tx++;
                handled |= CSR_INT_BIT_FH_TX;
                /* Wake up uCode load routine, now that load is complete */
                priv->ucode_write_complete = 1;
                wake_up(&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 disabled by irq */
        if (test_bit(STATUS_INT_ENABLED, &priv->status))
                iwl_legacy_enable_interrupts(priv);
        /* Re-enable RF_KILL if it occurred */
        else if (handled & CSR_INT_BIT_RF_KILL)
                iwl_legacy_enable_rfkill_int(priv);

#ifdef CONFIG_IWLWIFI_LEGACY_DEBUG
        if (iwl_legacy_get_debug_level(priv) & (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
}

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

#ifdef CONFIG_IWLWIFI_LEGACY_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.
 *
 * The debug_level being managed using sysfs below is a per device debug
 * level that is used instead of the global debug level if it (the per
 * device debug level) is set.
 */
static ssize_t iwl4965_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", iwl_legacy_get_debug_level(priv));
}
static ssize_t iwl4965_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;
                if (iwl_legacy_alloc_traffic_mem(priv))

                        IWL_ERR(priv,
                                "Not enough memory to generate traffic log\n");
        }
        return strnlen(buf, count);
}

static DEVICE_ATTR(debug_level, S_IWUSR | S_IRUGO,
                        iwl4965_show_debug_level, iwl4965_store_debug_level);


#endif /* CONFIG_IWLWIFI_LEGACY_DEBUG */


static ssize_t iwl4965_show_temperature(struct device *d,
                                struct device_attribute *attr, char *buf)
{
        struct iwl_priv *priv = dev_get_drvdata(d);

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

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

static DEVICE_ATTR(temperature, S_IRUGO, iwl4965_show_temperature, NULL);

static ssize_t iwl4965_show_tx_power(struct device *d,
                             struct device_attribute *attr, char *buf)
{
        struct iwl_priv *priv = dev_get_drvdata(d);

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

static ssize_t iwl4965_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 {
                ret = iwl_legacy_set_tx_power(priv, val, false);
                if (ret)
                        IWL_ERR(priv, "failed setting tx power (0x%d).\n",
                                ret);
                else
                        ret = count;
        }
        return ret;
}

static DEVICE_ATTR(tx_power, S_IWUSR | S_IRUGO,
                        iwl4965_show_tx_power, iwl4965_store_tx_power);

static struct attribute *iwl_sysfs_entries[] = {
        &dev_attr_temperature.attr,
        &dev_attr_tx_power.attr,
#ifdef CONFIG_IWLWIFI_LEGACY_DEBUG
        &dev_attr_debug_level.attr,
#endif
        NULL
};

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

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

static void iwl4965_dealloc_ucode_pci(struct iwl_priv *priv)
{
        iwl_legacy_free_fw_desc(priv->pci_dev, &priv->ucode_code);
        iwl_legacy_free_fw_desc(priv->pci_dev, &priv->ucode_data);
        iwl_legacy_free_fw_desc(priv->pci_dev, &priv->ucode_data_backup);
        iwl_legacy_free_fw_desc(priv->pci_dev, &priv->ucode_init);
        iwl_legacy_free_fw_desc(priv->pci_dev, &priv->ucode_init_data);
        iwl_legacy_free_fw_desc(priv->pci_dev, &priv->ucode_boot);
}

static void iwl4965_nic_start(struct iwl_priv *priv)
{
        /* Remove all resets to allow NIC to operate */
        iwl_write32(priv, CSR_RESET, 0);
}

static void iwl4965_ucode_callback(const struct firmware *ucode_raw,
                                        void *context);
static int iwl4965_mac_setup_register(struct iwl_priv *priv,
                                                u32 max_probe_length);

static int __must_check iwl4965_request_firmware(struct iwl_priv *priv, bool first)
{
        const char *name_pre = priv->cfg->fw_name_pre;
        char tag[8];

        if (first) {
                priv->fw_index = priv->cfg->ucode_api_max;
                sprintf(tag, "%d", priv->fw_index);
        } else {
                priv->fw_index--;
                sprintf(tag, "%d", priv->fw_index);
        }

        if (priv->fw_index < priv->cfg->ucode_api_min) {
                IWL_ERR(priv, "no suitable firmware found!\n");
                return -ENOENT;
        }

        sprintf(priv->firmware_name, "%s%s%s", name_pre, tag, ".ucode");

        IWL_DEBUG_INFO(priv, "attempting to load firmware '%s'\n",
                       priv->firmware_name);

        return request_firmware_nowait(THIS_MODULE, 1, priv->firmware_name,
                                       &priv->pci_dev->dev, GFP_KERNEL, priv,
                                       iwl4965_ucode_callback);
}

struct iwl4965_firmware_pieces {
        const void *inst, *data, *init, *init_data, *boot;
        size_t inst_size, data_size, init_size, init_data_size, boot_size;
};

static int iwl4965_load_firmware(struct iwl_priv *priv,
                                       const struct firmware *ucode_raw,
                                       struct iwl4965_firmware_pieces *pieces)
{
        struct iwl_ucode_header *ucode = (void *)ucode_raw->data;
        u32 api_ver, hdr_size;
        const u8 *src;

        priv->ucode_ver = le32_to_cpu(ucode->ver);
        api_ver = IWL_UCODE_API(priv->ucode_ver);

        switch (api_ver) {
        default:
        case 0:
        case 1:
        case 2:
                hdr_size = 24;
                if (ucode_raw->size < hdr_size) {
                        IWL_ERR(priv, "File size too small!\n");
                        return -EINVAL;
                }
                pieces->inst_size = le32_to_cpu(ucode->v1.inst_size);
                pieces->data_size = le32_to_cpu(ucode->v1.data_size);
                pieces->init_size = le32_to_cpu(ucode->v1.init_size);
                pieces->init_data_size =
                                le32_to_cpu(ucode->v1.init_data_size);
                pieces->boot_size = le32_to_cpu(ucode->v1.boot_size);
                src = ucode->v1.data;
                break;
        }

        /* Verify size of file vs. image size info in file's header */
        if (ucode_raw->size != hdr_size + pieces->inst_size +
                                pieces->data_size + pieces->init_size +
                                pieces->init_data_size + pieces->boot_size) {

                IWL_ERR(priv,
                        "uCode file size %d does not match expected size\n",
                        (int)ucode_raw->size);
                return -EINVAL;
        }

        pieces->inst = src;
        src += pieces->inst_size;
        pieces->data = src;
        src += pieces->data_size;
        pieces->init = src;
        src += pieces->init_size;
        pieces->init_data = src;
        src += pieces->init_data_size;
        pieces->boot = src;
        src += pieces->boot_size;

        return 0;
}

/**
 * iwl4965_ucode_callback - callback when firmware was loaded
 *
 * If loaded successfully, copies the firmware into buffers
 * for the card to fetch (via DMA).
 */
static void
iwl4965_ucode_callback(const struct firmware *ucode_raw, void *context)
{
        struct iwl_priv *priv = context;
        struct iwl_ucode_header *ucode;
        int err;
        struct iwl4965_firmware_pieces pieces;
        const unsigned int api_max = priv->cfg->ucode_api_max;
        const unsigned int api_min = priv->cfg->ucode_api_min;
        u32 api_ver;

        u32 max_probe_length = 200;
        u32 standard_phy_calibration_size =
                        IWL_DEFAULT_STANDARD_PHY_CALIBRATE_TBL_SIZE;

        memset(&pieces, 0, sizeof(pieces));

        if (!ucode_raw) {
                if (priv->fw_index <= priv->cfg->ucode_api_max)
                        IWL_ERR(priv,
                                "request for firmware file '%s' failed.\n",
                                priv->firmware_name);
                goto try_again;
        }

        IWL_DEBUG_INFO(priv, "Loaded firmware file '%s' (%zd bytes).\n",
                       priv->firmware_name, ucode_raw->size);

        /* Make sure that we got at least the API version number */
        if (ucode_raw->size < 4) {
                IWL_ERR(priv, "File size way too small!\n");
                goto try_again;
        }

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

        err = iwl4965_load_firmware(priv, ucode_raw, &pieces);

        if (err)
                goto try_again;

        api_ver = IWL_UCODE_API(priv->ucode_ver);

        /*
         * 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);
                goto try_again;
        }

        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));

        snprintf(priv->hw->wiphy->fw_version,
                 sizeof(priv->hw->wiphy->fw_version),
                 "%u.%u.%u.%u",
                 IWL_UCODE_MAJOR(priv->ucode_ver),
                 IWL_UCODE_MINOR(priv->ucode_ver),
                 IWL_UCODE_API(priv->ucode_ver),
                 IWL_UCODE_SERIAL(priv->ucode_ver));

        /*
         * For any of the failures below (before allocating pci memory)
         * we will try to load a version with a smaller API -- maybe the
         * user just got a corrupted version of the latest API.
         */

        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 = %Zd\n",
                       pieces.inst_size);
        IWL_DEBUG_INFO(priv, "f/w package hdr runtime data size = %Zd\n",
                       pieces.data_size);
        IWL_DEBUG_INFO(priv, "f/w package hdr init inst size = %Zd\n",
                       pieces.init_size);
        IWL_DEBUG_INFO(priv, "f/w package hdr init data size = %Zd\n",
                       pieces.init_data_size);
        IWL_DEBUG_INFO(priv, "f/w package hdr boot inst size = %Zd\n",
                       pieces.boot_size);

        /* Verify that uCode images will fit in card's SRAM */
        if (pieces.inst_size > priv->hw_params.max_inst_size) {
                IWL_ERR(priv, "uCode instr len %Zd too large to fit in\n",
                        pieces.inst_size);
                goto try_again;
        }

        if (pieces.data_size > priv->hw_params.max_data_size) {
                IWL_ERR(priv, "uCode data len %Zd too large to fit in\n",
                        pieces.data_size);
                goto try_again;
        }

        if (pieces.init_size > priv->hw_params.max_inst_size) {
                IWL_ERR(priv, "uCode init instr len %Zd too large to fit in\n",
                        pieces.init_size);
                goto try_again;
        }

        if (pieces.init_data_size > priv->hw_params.max_data_size) {
                IWL_ERR(priv, "uCode init data len %Zd too large to fit in\n",
                        pieces.init_data_size);
                goto try_again;
        }

        if (pieces.boot_size > priv->hw_params.max_bsm_size) {
                IWL_ERR(priv, "uCode boot instr len %Zd too large to fit in\n",
                        pieces.boot_size);
                goto try_again;
        }

        /* 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 = pieces.inst_size;
        iwl_legacy_alloc_fw_desc(priv->pci_dev, &priv->ucode_code);

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

        priv->ucode_data_backup.len = pieces.data_size;
        iwl_legacy_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 (pieces.init_size && pieces.init_data_size) {
                priv->ucode_init.len = pieces.init_size;
                iwl_legacy_alloc_fw_desc(priv->pci_dev, &priv->ucode_init);

                priv->ucode_init_data.len = pieces.init_data_size;
                iwl_legacy_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 (pieces.boot_size) {
                priv->ucode_boot.len = pieces.boot_size;
                iwl_legacy_alloc_fw_desc(priv->pci_dev, &priv->ucode_boot);

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

        /* Now that we can no longer fail, copy information */

        priv->sta_key_max_num = STA_KEY_MAX_NUM;

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

        /* Runtime instructions (first block of data in file) */
        IWL_DEBUG_INFO(priv, "Copying (but not loading) uCode instr len %Zd\n",
                        pieces.inst_size);
        memcpy(priv->ucode_code.v_addr, pieces.inst, pieces.inst_size);

        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
         * NOTE:  Copy into backup buffer will be done in iwl_up()
         */
        IWL_DEBUG_INFO(priv, "Copying (but not loading) uCode data len %Zd\n",
                        pieces.data_size);
        memcpy(priv->ucode_data.v_addr, pieces.data, pieces.data_size);
        memcpy(priv->ucode_data_backup.v_addr, pieces.data, pieces.data_size);

        /* Initialization instructions */
        if (pieces.init_size) {
                IWL_DEBUG_INFO(priv,
                                "Copying (but not loading) init instr len %Zd\n",
                                pieces.init_size);
                memcpy(priv->ucode_init.v_addr, pieces.init, pieces.init_size);
        }

        /* Initialization data */
        if (pieces.init_data_size) {
                IWL_DEBUG_INFO(priv,
                                "Copying (but not loading) init data len %Zd\n",
                               pieces.init_data_size);
                memcpy(priv->ucode_init_data.v_addr, pieces.init_data,
                       pieces.init_data_size);
        }

        /* Bootstrap instructions */
        IWL_DEBUG_INFO(priv, "Copying (but not loading) boot instr len %Zd\n",
                        pieces.boot_size);
        memcpy(priv->ucode_boot.v_addr, pieces.boot, pieces.boot_size);

        /*
         * figure out the offset of chain noise reset and gain commands
         * base on the size of standard phy calibration commands table size
         */
        priv->_4965.phy_calib_chain_noise_reset_cmd =
                standard_phy_calibration_size;
        priv->_4965.phy_calib_chain_noise_gain_cmd =
                standard_phy_calibration_size + 1;

        /**************************************************
         * This is still part of probe() in a sense...
         *
         * 9. Setup and register with mac80211 and debugfs
         **************************************************/
        err = iwl4965_mac_setup_register(priv, max_probe_length);
        if (err)
                goto out_unbind;

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

        err = sysfs_create_group(&priv->pci_dev->dev.kobj,
                                        &iwl_attribute_group);
        if (err) {
                IWL_ERR(priv, "failed to create sysfs device attributes\n");
                goto out_unbind;
        }

        /* We have our copies now, allow OS release its copies */
        release_firmware(ucode_raw);
        complete(&priv->_4965.firmware_loading_complete);
        return;

 try_again:
        /* try next, if any */
        if (iwl4965_request_firmware(priv, false))
                goto out_unbind;
        release_firmware(ucode_raw);
        return;

 err_pci_alloc:
        IWL_ERR(priv, "failed to allocate pci memory\n");
        iwl4965_dealloc_ucode_pci(priv);
 out_unbind:
        complete(&priv->_4965.firmware_loading_complete);
        device_release_driver(&priv->pci_dev->dev);
        release_firmware(ucode_raw);
}

static const char * const desc_lookup_text[] = {
        "OK",
        "FAIL",
        "BAD_PARAM",
        "BAD_CHECKSUM",
        "NMI_INTERRUPT_WDG",
        "SYSASSERT",
        "FATAL_ERROR",
        "BAD_COMMAND",
        "HW_ERROR_TUNE_LOCK",
        "HW_ERROR_TEMPERATURE",
        "ILLEGAL_CHAN_FREQ",
        "VCC_NOT_STABLE",
        "FH_ERROR",
        "NMI_INTERRUPT_HOST",
        "NMI_INTERRUPT_ACTION_PT",
        "NMI_INTERRUPT_UNKNOWN",
        "UCODE_VERSION_MISMATCH",
        "HW_ERROR_ABS_LOCK",
        "HW_ERROR_CAL_LOCK_FAIL",
        "NMI_INTERRUPT_INST_ACTION_PT",
        "NMI_INTERRUPT_DATA_ACTION_PT",
        "NMI_TRM_HW_ER",
        "NMI_INTERRUPT_TRM",
        "NMI_INTERRUPT_BREAK_POINT",
        "DEBUG_0",
        "DEBUG_1",
        "DEBUG_2",
        "DEBUG_3",
};

static struct { char *name; u8 num; } advanced_lookup[] = {
        { "NMI_INTERRUPT_WDG", 0x34 },
        { "SYSASSERT", 0x35 },
        { "UCODE_VERSION_MISMATCH", 0x37 },
        { "BAD_COMMAND", 0x38 },
        { "NMI_INTERRUPT_DATA_ACTION_PT", 0x3C },
        { "FATAL_ERROR", 0x3D },
        { "NMI_TRM_HW_ERR", 0x46 },
        { "NMI_INTERRUPT_TRM", 0x4C },
        { "NMI_INTERRUPT_BREAK_POINT", 0x54 },
        { "NMI_INTERRUPT_WDG_RXF_FULL", 0x5C },
        { "NMI_INTERRUPT_WDG_NO_RBD_RXF_FULL", 0x64 },
        { "NMI_INTERRUPT_HOST", 0x66 },
        { "NMI_INTERRUPT_ACTION_PT", 0x7C },
        { "NMI_INTERRUPT_UNKNOWN", 0x84 },
        { "NMI_INTERRUPT_INST_ACTION_PT", 0x86 },
        { "ADVANCED_SYSASSERT", 0 },
};

static const char *iwl4965_desc_lookup(u32 num)
{
        int i;
        int max = ARRAY_SIZE(desc_lookup_text);

        if (num < max)
                return desc_lookup_text[num];

        max = ARRAY_SIZE(advanced_lookup) - 1;
        for (i = 0; i < max; i++) {
                if (advanced_lookup[i].num == num)
                        break;
        }
        return advanced_lookup[i].name;
}

#define ERROR_START_OFFSET  (1 * sizeof(u32))
#define ERROR_ELEM_SIZE     (7 * sizeof(u32))

void iwl4965_dump_nic_error_log(struct iwl_priv *priv)
{
        u32 data2, line;
        u32 desc, time, count, base, data1;
        u32 blink1, blink2, ilink1, ilink2;
        u32 pc, hcmd;

        if (priv->ucode_type == UCODE_INIT) {
                base = le32_to_cpu(priv->card_alive_init.error_event_table_ptr);
        } else {
                base = le32_to_cpu(priv->card_alive.error_event_table_ptr);
        }

        if (!priv->cfg->ops->lib->is_valid_rtc_data_addr(base)) {
                IWL_ERR(priv,
                        "Not valid error log pointer 0x%08X for %s uCode\n",
                        base, (priv->ucode_type == UCODE_INIT) ? "Init" : "RT");
                return;
        }

        count = iwl_legacy_read_targ_mem(priv, base);

        if (ERROR_START_OFFSET <= count * ERROR_ELEM_SIZE) {
                IWL_ERR(priv, "Start IWL Error Log Dump:\n");
                IWL_ERR(priv, "Status: 0x%08lX, count: %d\n",
                        priv->status, count);
        }

        desc = iwl_legacy_read_targ_mem(priv, base + 1 * sizeof(u32));
        priv->isr_stats.err_code = desc;
        pc = iwl_legacy_read_targ_mem(priv, base + 2 * sizeof(u32));
        blink1 = iwl_legacy_read_targ_mem(priv, base + 3 * sizeof(u32));
        blink2 = iwl_legacy_read_targ_mem(priv, base + 4 * sizeof(u32));
        ilink1 = iwl_legacy_read_targ_mem(priv, base + 5 * sizeof(u32));
        ilink2 = iwl_legacy_read_targ_mem(priv, base + 6 * sizeof(u32));
        data1 = iwl_legacy_read_targ_mem(priv, base + 7 * sizeof(u32));
        data2 = iwl_legacy_read_targ_mem(priv, base + 8 * sizeof(u32));
        line = iwl_legacy_read_targ_mem(priv, base + 9 * sizeof(u32));
        time = iwl_legacy_read_targ_mem(priv, base + 11 * sizeof(u32));
        hcmd = iwl_legacy_read_targ_mem(priv, base + 22 * sizeof(u32));

        trace_iwlwifi_legacy_dev_ucode_error(priv, desc,
                                        time, data1, data2, line,
                                      blink1, blink2, ilink1, ilink2);

        IWL_ERR(priv, "Desc                                  Time       "
                "data1      data2      line\n");
        IWL_ERR(priv, "%-28s (0x%04X) %010u 0x%08X 0x%08X %u\n",
                iwl4965_desc_lookup(desc), desc, time, data1, data2, line);
        IWL_ERR(priv, "pc      blink1  blink2  ilink1  ilink2  hcmd\n");
        IWL_ERR(priv, "0x%05X 0x%05X 0x%05X 0x%05X 0x%05X 0x%05X\n",
                pc, blink1, blink2, ilink1, ilink2, hcmd);
}

static void iwl4965_rf_kill_ct_config(struct iwl_priv *priv)
{
        struct iwl_ct_kill_config cmd;
        unsigned long flags;
        int ret = 0;

        spin_lock_irqsave(&priv->lock, flags);
        iwl_write32(priv, CSR_UCODE_DRV_GP1_CLR,
                    CSR_UCODE_DRV_GP1_REG_BIT_CT_KILL_EXIT);
        spin_unlock_irqrestore(&priv->lock, flags);

        cmd.critical_temperature_R =
                cpu_to_le32(priv->hw_params.ct_kill_threshold);

        ret = iwl_legacy_send_cmd_pdu(priv, REPLY_CT_KILL_CONFIG_CMD,
                               sizeof(cmd), &cmd);
        if (ret)
                IWL_ERR(priv, "REPLY_CT_KILL_CONFIG_CMD failed\n");
        else
                IWL_DEBUG_INFO(priv, "REPLY_CT_KILL_CONFIG_CMD "
                                "succeeded, "
                                "critical temperature is %d\n",
                                priv->hw_params.ct_kill_threshold);
}

static const s8 default_queue_to_tx_fifo[] = {
        IWL_TX_FIFO_VO,
        IWL_TX_FIFO_VI,
        IWL_TX_FIFO_BE,
        IWL_TX_FIFO_BK,
        IWL49_CMD_FIFO_NUM,
        IWL_TX_FIFO_UNUSED,
        IWL_TX_FIFO_UNUSED,
};

static int iwl4965_alive_notify(struct iwl_priv *priv)
{
        u32 a;
        unsigned long flags;
        int i, chan;
        u32 reg_val;

        spin_lock_irqsave(&priv->lock, flags);

        /* Clear 4965's internal Tx Scheduler data base */
        priv->scd_base_addr = iwl_legacy_read_prph(priv,
                                        IWL49_SCD_SRAM_BASE_ADDR);
        a = priv->scd_base_addr + IWL49_SCD_CONTEXT_DATA_OFFSET;
        for (; a < priv->scd_base_addr + IWL49_SCD_TX_STTS_BITMAP_OFFSET; a += 4)
                iwl_legacy_write_targ_mem(priv, a, 0);
        for (; a < priv->scd_base_addr + IWL49_SCD_TRANSLATE_TBL_OFFSET; a += 4)
                iwl_legacy_write_targ_mem(priv, a, 0);
        for (; a < priv->scd_base_addr +
               IWL49_SCD_TRANSLATE_TBL_OFFSET_QUEUE(priv->hw_params.max_txq_num); a += 4)
                iwl_legacy_write_targ_mem(priv, a, 0);

        /* Tel 4965 where to find Tx byte count tables */
        iwl_legacy_write_prph(priv, IWL49_SCD_DRAM_BASE_ADDR,
                        priv->scd_bc_tbls.dma >> 10);

        /* Enable DMA channel */
        for (chan = 0; chan < FH49_TCSR_CHNL_NUM ; chan++)
                iwl_legacy_write_direct32(priv,
                                FH_TCSR_CHNL_TX_CONFIG_REG(chan),
                                FH_TCSR_TX_CONFIG_REG_VAL_DMA_CHNL_ENABLE |
                                FH_TCSR_TX_CONFIG_REG_VAL_DMA_CREDIT_ENABLE);

        /* Update FH chicken bits */
        reg_val = iwl_legacy_read_direct32(priv, FH_TX_CHICKEN_BITS_REG);
        iwl_legacy_write_direct32(priv, FH_TX_CHICKEN_BITS_REG,
                           reg_val | FH_TX_CHICKEN_BITS_SCD_AUTO_RETRY_EN);

        /* Disable chain mode for all queues */
        iwl_legacy_write_prph(priv, IWL49_SCD_QUEUECHAIN_SEL, 0);

        /* Initialize each Tx queue (including the command queue) */
        for (i = 0; i < priv->hw_params.max_txq_num; i++) {

                /* TFD circular buffer read/write indexes */
                iwl_legacy_write_prph(priv, IWL49_SCD_QUEUE_RDPTR(i), 0);
                iwl_legacy_write_direct32(priv, HBUS_TARG_WRPTR, 0 | (i << 8));

                /* Max Tx Window size for Scheduler-ACK mode */
                iwl_legacy_write_targ_mem(priv, priv->scd_base_addr +
                                IWL49_SCD_CONTEXT_QUEUE_OFFSET(i),
                                (SCD_WIN_SIZE <<
                                IWL49_SCD_QUEUE_CTX_REG1_WIN_SIZE_POS) &
                                IWL49_SCD_QUEUE_CTX_REG1_WIN_SIZE_MSK);

                /* Frame limit */
                iwl_legacy_write_targ_mem(priv, priv->scd_base_addr +
                                IWL49_SCD_CONTEXT_QUEUE_OFFSET(i) +
                                sizeof(u32),
                                (SCD_FRAME_LIMIT <<
                                IWL49_SCD_QUEUE_CTX_REG2_FRAME_LIMIT_POS) &
                                IWL49_SCD_QUEUE_CTX_REG2_FRAME_LIMIT_MSK);

        }
        iwl_legacy_write_prph(priv, IWL49_SCD_INTERRUPT_MASK,
                                 (1 << priv->hw_params.max_txq_num) - 1);

        /* Activate all Tx DMA/FIFO channels */
        iwl4965_txq_set_sched(priv, IWL_MASK(0, 6));

        iwl4965_set_wr_ptrs(priv, IWL_DEFAULT_CMD_QUEUE_NUM, 0);

        /* make sure all queue are not stopped */
        memset(&priv->queue_stopped[0], 0, sizeof(priv->queue_stopped));
        for (i = 0; i < 4; i++)
                atomic_set(&priv->queue_stop_count[i], 0);

        /* reset to 0 to enable all the queue first */
        priv->txq_ctx_active_msk = 0;
        /* Map each Tx/cmd queue to its corresponding fifo */
        BUILD_BUG_ON(ARRAY_SIZE(default_queue_to_tx_fifo) != 7);

        for (i = 0; i < ARRAY_SIZE(default_queue_to_tx_fifo); i++) {
                int ac = default_queue_to_tx_fifo[i];

                iwl_txq_ctx_activate(priv, i);

                if (ac == IWL_TX_FIFO_UNUSED)
                        continue;

                iwl4965_tx_queue_set_status(priv, &priv->txq[i], ac, 0);
        }

        spin_unlock_irqrestore(&priv->lock, flags);

        return 0;
}

/**
 * iwl4965_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 iwl4965_alive_start(struct iwl_priv *priv)
{
        int ret = 0;
        struct iwl_rxon_context *ctx = &priv->contexts[IWL_RXON_CTX_BSS];

        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 (iwl4965_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;
        }

        ret = iwl4965_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);

        /* Enable watchdog to monitor the driver tx queues */
        iwl_legacy_setup_watchdog(priv);

        if (iwl_legacy_is_rfkill(priv))
                return;

        ieee80211_wake_queues(priv->hw);

        priv->active_rate = IWL_RATES_MASK;

        if (iwl_legacy_is_associated_ctx(ctx)) {
                struct iwl_legacy_rxon_cmd *active_rxon =
                                (struct iwl_legacy_rxon_cmd *)&ctx->active;
                /* apply any changes in staging */
                ctx->staging.filter_flags |= RXON_FILTER_ASSOC_MSK;
                active_rxon->filter_flags &= ~RXON_FILTER_ASSOC_MSK;
        } else {
                struct iwl_rxon_context *tmp;
                /* Initialize our rx_config data */
                for_each_context(priv, tmp)
                        iwl_legacy_connection_init_rx_config(priv, tmp);

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

        /* Configure bluetooth coexistence if enabled */
        iwl_legacy_send_bt_config(priv);

        iwl4965_reset_run_time_calib(priv);

        set_bit(STATUS_READY, &priv->status);

        /* Configure the adapter for unassociated operation */
        iwl_legacy_commit_rxon(priv, ctx);

        /* At this point, the NIC is initialized and operational */
        iwl4965_rf_kill_ct_config(priv);

        IWL_DEBUG_INFO(priv, "ALIVE processing complete.\n");
        wake_up(&priv->wait_command_queue);

        iwl_legacy_power_update_mode(priv, true);
        IWL_DEBUG_INFO(priv, "Updated power mode\n");

        return;

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

static void iwl4965_cancel_deferred_work(struct iwl_priv *priv);

static void __iwl4965_down(struct iwl_priv *priv)
{
        unsigned long flags;
        int exit_pending;

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

        iwl_legacy_scan_cancel_timeout(priv, 200);

        exit_pending = test_and_set_bit(STATUS_EXIT_PENDING, &priv->status);

        /* Stop TX queues watchdog. We need to have STATUS_EXIT_PENDING bit set
         * to prevent rearm timer */
        del_timer_sync(&priv->watchdog);

        iwl_legacy_clear_ucode_stations(priv, NULL);
        iwl_legacy_dealloc_bcast_stations(priv);
        iwl_legacy_clear_driver_stations(priv);

        /* Unblock any waiting calls */
        wake_up_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_legacy_disable_interrupts(priv);
        spin_unlock_irqrestore(&priv->lock, flags);
        iwl4965_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_legacy_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;

        iwl4965_txq_ctx_stop(priv);
        iwl4965_rxq_stop(priv);

        /* Power-down device's busmaster DMA clocks */
        iwl_legacy_write_prph(priv, APMG_CLK_DIS_REG, APMG_CLK_VAL_DMA_CLK_RQT);
        udelay(5);

        /* Make sure (redundant) we've released our request to stay awake */
        iwl_legacy_clear_bit(priv, CSR_GP_CNTRL,
                                CSR_GP_CNTRL_REG_FLAG_MAC_ACCESS_REQ);

        /* Stop the device, and put it in low power state */
        iwl_legacy_apm_stop(priv);

 exit:
        memset(&priv->card_alive, 0, sizeof(struct iwl_alive_resp));

        dev_kfree_skb(priv->beacon_skb);
        priv->beacon_skb = NULL;

        /* clear out any free frames */
        iwl4965_clear_free_frames(priv);
}

static void iwl4965_down(struct iwl_priv *priv)
{
        mutex_lock(&priv->mutex);
        __iwl4965_down(priv);
        mutex_unlock(&priv->mutex);

        iwl4965_cancel_deferred_work(priv);
}

#define HW_READY_TIMEOUT (50)

static int iwl4965_set_hw_ready(struct iwl_priv *priv)
{
        int ret = 0;

        iwl_legacy_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 iwl4965_prepare_card_hw(struct iwl_priv *priv)
{
        int ret = 0;

        IWL_DEBUG_INFO(priv, "iwl4965_prepare_card_hw enter\n");

        ret = iwl4965_set_hw_ready(priv);
        if (priv->hw_ready)
                return ret;

        /* If HW is not ready, prepare the conditions to check again */
        iwl_legacy_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);

        /* HW should be ready by now, check again. */
        if (ret != -ETIMEDOUT)
                iwl4965_set_hw_ready(priv);

        return ret;
}

#define MAX_HW_RESTARTS 5

static int __iwl4965_up(struct iwl_priv *priv)
{
        struct iwl_rxon_context *ctx;
        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;
        }

        for_each_context(priv, ctx) {
                ret = iwl4965_alloc_bcast_station(priv, ctx);
                if (ret) {
                        iwl_legacy_dealloc_bcast_stations(priv);
                        return ret;
                }
        }

        iwl4965_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_legacy_is_rfkill(priv)) {
                wiphy_rfkill_set_hw_state(priv->hw->wiphy, true);

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

        iwl_write32(priv, CSR_INT, 0xFFFFFFFF);

        /* must be initialised before iwl_hw_nic_init */
        priv->cmd_queue = IWL_DEFAULT_CMD_QUEUE_NUM;

        ret = iwl4965_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_legacy_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++) {

                /* 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 */
                iwl4965_nic_start(priv);

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

                return 0;
        }

        set_bit(STATUS_EXIT_PENDING, &priv->status);
        __iwl4965_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 iwl4965_bg_init_alive_start(struct work_struct *data)
{
        struct iwl_priv *priv =
            container_of(data, struct iwl_priv, init_alive_start.work);

        mutex_lock(&priv->mutex);
        if (test_bit(STATUS_EXIT_PENDING, &priv->status))
                goto out;

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

static void iwl4965_bg_alive_start(struct work_struct *data)
{
        struct iwl_priv *priv =
            container_of(data, struct iwl_priv, alive_start.work);

        mutex_lock(&priv->mutex);
        if (test_bit(STATUS_EXIT_PENDING, &priv->status))
                goto out;

        iwl4965_alive_start(priv);
out:
        mutex_unlock(&priv->mutex);
}

static void iwl4965_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) {
                iwl4965_chain_noise_calibration(priv,
                                (void *)&priv->_4965.statistics);
                iwl4965_sensitivity_calibration(priv,
                                (void *)&priv->_4965.statistics);
        }

        mutex_unlock(&priv->mutex);
}

static void iwl4965_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)) {
                struct iwl_rxon_context *ctx;

                mutex_lock(&priv->mutex);
                for_each_context(priv, ctx)
                        ctx->vif = NULL;
                priv->is_open = 0;

                __iwl4965_down(priv);

                mutex_unlock(&priv->mutex);
                iwl4965_cancel_deferred_work(priv);
                ieee80211_restart_hw(priv->hw);
        } else {
                iwl4965_down(priv);

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

                __iwl4965_up(priv);
                mutex_unlock(&priv->mutex);
        }
}

static void iwl4965_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);
        iwl4965_rx_replenish(priv);
        mutex_unlock(&priv->mutex);
}

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

#define UCODE_READY_TIMEOUT     (4 * HZ)

/*
 * Not a mac80211 entry point function, but it fits in with all the
 * other mac80211 functions grouped here.
 */
static int iwl4965_mac_setup_register(struct iwl_priv *priv,
                                  u32 max_probe_length)
{
        int ret;
        struct ieee80211_hw *hw = priv->hw;
        struct iwl_rxon_context *ctx;

        hw->rate_control_algorithm = "iwl-4965-rs";

        /* Tell mac80211 our characteristics */
        hw->flags = IEEE80211_HW_SIGNAL_DBM |
                    IEEE80211_HW_AMPDU_AGGREGATION |
                    IEEE80211_HW_NEED_DTIM_PERIOD |
                    IEEE80211_HW_SPECTRUM_MGMT |
                    IEEE80211_HW_REPORTS_TX_ACK_STATUS;

        if (priv->cfg->sku & IWL_SKU_N)
                hw->flags |= IEEE80211_HW_SUPPORTS_DYNAMIC_SMPS |
                             IEEE80211_HW_SUPPORTS_STATIC_SMPS;

        hw->sta_data_size = sizeof(struct iwl_station_priv);
        hw->vif_data_size = sizeof(struct iwl_vif_priv);

        for_each_context(priv, ctx) {
                hw->wiphy->interface_modes |= ctx->interface_modes;
                hw->wiphy->interface_modes |= ctx->exclusive_interface_modes;
        }

        hw->wiphy->flags |= WIPHY_FLAG_CUSTOM_REGULATORY |
                            WIPHY_FLAG_DISABLE_BEACON_HINTS;

        /*
         * For now, disable PS by default because it affects
         * RX performance significantly.
         */
        hw->wiphy->flags &= ~WIPHY_FLAG_PS_ON_BY_DEFAULT;

        hw->wiphy->max_scan_ssids = PROBE_OPTION_MAX;
        /* we create the 802.11 header and a zero-length SSID element */
        hw->wiphy->max_scan_ie_len = max_probe_length - 24 - 2;

        /* Default value; 4 EDCA QOS priorities */
        hw->queues = 4;

        hw->max_listen_interval = IWL_CONN_MAX_LISTEN_INTERVAL;

        if (priv->bands[IEEE80211_BAND_2GHZ].n_channels)
                priv->hw->wiphy->bands[IEEE80211_BAND_2GHZ] =
                        &priv->bands[IEEE80211_BAND_2GHZ];
        if (priv->bands[IEEE80211_BAND_5GHZ].n_channels)
                priv->hw->wiphy->bands[IEEE80211_BAND_5GHZ] =
                        &priv->bands[IEEE80211_BAND_5GHZ];

        iwl_legacy_leds_init(priv);

        ret = ieee80211_register_hw(priv->hw);
        if (ret) {
                IWL_ERR(priv, "Failed to register hw (error %d)\n", ret);
                return ret;
        }
        priv->mac80211_registered = 1;

        return 0;
}


int iwl4965_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);
        ret = __iwl4965_up(priv);
        mutex_unlock(&priv->mutex);

        if (ret)
                return ret;

        if (iwl_legacy_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_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;
                }
        }

        iwl4965_led_enable(priv);

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

void iwl4965_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;

        iwl4965_down(priv);

        flush_workqueue(priv->workqueue);

        /* User space software may expect getting rfkill changes
         * even if interface is down */
        iwl_write32(priv, CSR_INT, 0xFFFFFFFF);
        iwl_legacy_enable_rfkill_int(priv);

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

void iwl4965_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 (iwl4965_tx_skb(priv, skb))
                dev_kfree_skb_any(skb);

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

void iwl4965_mac_update_tkip_key(struct ieee80211_hw *hw,
                                struct ieee80211_vif *vif,
                                struct ieee80211_key_conf *keyconf,
                                struct ieee80211_sta *sta,
                                u32 iv32, u16 *phase1key)
{
        struct iwl_priv *priv = hw->priv;
        struct iwl_vif_priv *vif_priv = (void *)vif->drv_priv;

        IWL_DEBUG_MAC80211(priv, "enter\n");

        iwl4965_update_tkip_key(priv, vif_priv->ctx, keyconf, sta,
                            iv32, phase1key);

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

int iwl4965_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;
        struct iwl_vif_priv *vif_priv = (void *)vif->drv_priv;
        struct iwl_rxon_context *ctx = vif_priv->ctx;
        int ret;
        u8 sta_id;
        bool is_default_wep_key = false;

        IWL_DEBUG_MAC80211(priv, "enter\n");

        if (priv->cfg->mod_params->sw_crypto) {
                IWL_DEBUG_MAC80211(priv, "leave - hwcrypto disabled\n");
                return -EOPNOTSUPP;
        }

        sta_id = iwl_legacy_sta_id_or_broadcast(priv, vif_priv->ctx, sta);
        if (sta_id == IWL_INVALID_STATION)
                return -EINVAL;

        mutex_lock(&priv->mutex);
        iwl_legacy_scan_cancel_timeout(priv, 100);

        /*
         * 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->cipher == WLAN_CIPHER_SUITE_WEP40 ||
             key->cipher == WLAN_CIPHER_SUITE_WEP104) &&
            !sta) {
                if (cmd == SET_KEY)
                        is_default_wep_key = !ctx->key_mapping_keys;
                else
                        is_default_wep_key =
                                        (key->hw_key_idx == HW_KEY_DEFAULT);
        }

        switch (cmd) {
        case SET_KEY:
                if (is_default_wep_key)
                        ret = iwl4965_set_default_wep_key(priv,
                                                        vif_priv->ctx, key);
                else
                        ret = iwl4965_set_dynamic_key(priv, vif_priv->ctx,
                                                  key, sta_id);

                IWL_DEBUG_MAC80211(priv, "enable hwcrypto key\n");
                break;
        case DISABLE_KEY:
                if (is_default_wep_key)
                        ret = iwl4965_remove_default_wep_key(priv, ctx, key);
                else
                        ret = iwl4965_remove_dynamic_key(priv, ctx,
                                                        key, sta_id);

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

        mutex_unlock(&priv->mutex);
        IWL_DEBUG_MAC80211(priv, "leave\n");

        return ret;
}

int iwl4965_mac_ampdu_action(struct ieee80211_hw *hw,
                            struct ieee80211_vif *vif,
                            enum ieee80211_ampdu_mlme_action action,
                            struct ieee80211_sta *sta, u16 tid, u16 *ssn,
                            u8 buf_size)
{
        struct iwl_priv *priv = hw->priv;
        int ret = -EINVAL;

        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;

        mutex_lock(&priv->mutex);

        switch (action) {
        case IEEE80211_AMPDU_RX_START:
                IWL_DEBUG_HT(priv, "start Rx\n");
                ret = iwl4965_sta_rx_agg_start(priv, sta, tid, *ssn);
                break;
        case IEEE80211_AMPDU_RX_STOP:
                IWL_DEBUG_HT(priv, "stop Rx\n");
                ret = iwl4965_sta_rx_agg_stop(priv, sta, tid);
                if (test_bit(STATUS_EXIT_PENDING, &priv->status))
                        ret = 0;
                break;
        case IEEE80211_AMPDU_TX_START:
                IWL_DEBUG_HT(priv, "start Tx\n");
                ret = iwl4965_tx_agg_start(priv, vif, sta, tid, ssn);
                break;
        case IEEE80211_AMPDU_TX_STOP:
                IWL_DEBUG_HT(priv, "stop Tx\n");
                ret = iwl4965_tx_agg_stop(priv, vif, sta, tid);
                if (test_bit(STATUS_EXIT_PENDING, &priv->status))
                        ret = 0;
                break;
        case IEEE80211_AMPDU_TX_OPERATIONAL:
                ret = 0;
                break;
        }
        mutex_unlock(&priv->mutex);

        return ret;
}

int iwl4965_mac_sta_add(struct ieee80211_hw *hw,
                       struct ieee80211_vif *vif,
                       struct ieee80211_sta *sta)
{
        struct iwl_priv *priv = hw->priv;
        struct iwl_station_priv *sta_priv = (void *)sta->drv_priv;
        struct iwl_vif_priv *vif_priv = (void *)vif->drv_priv;
        bool is_ap = vif->type == NL80211_IFTYPE_STATION;
        int ret;
        u8 sta_id;

        IWL_DEBUG_INFO(priv, "received request to add station %pM\n",
                        sta->addr);
        mutex_lock(&priv->mutex);
        IWL_DEBUG_INFO(priv, "proceeding to add station %pM\n",
                        sta->addr);
        sta_priv->common.sta_id = IWL_INVALID_STATION;

        atomic_set(&sta_priv->pending_frames, 0);

        ret = iwl_legacy_add_station_common(priv, vif_priv->ctx, sta->addr,
                                     is_ap, sta, &sta_id);
        if (ret) {
                IWL_ERR(priv, "Unable to add station %pM (%d)\n",
                        sta->addr, ret);
                /* Should we return success if return code is EEXIST ? */
                mutex_unlock(&priv->mutex);
                return ret;
        }

        sta_priv->common.sta_id = sta_id;

        /* Initialize rate scaling */
        IWL_DEBUG_INFO(priv, "Initializing rate scaling for station %pM\n",
                       sta->addr);
        iwl4965_rs_rate_init(priv, sta, sta_id);
        mutex_unlock(&priv->mutex);

        return 0;
}

void iwl4965_mac_channel_switch(struct ieee80211_hw *hw,
                               struct ieee80211_channel_switch *ch_switch)
{
        struct iwl_priv *priv = hw->priv;
        const struct iwl_channel_info *ch_info;
        struct ieee80211_conf *conf = &hw->conf;
        struct ieee80211_channel *channel = ch_switch->channel;
        struct iwl_ht_config *ht_conf = &priv->current_ht_config;

        struct iwl_rxon_context *ctx = &priv->contexts[IWL_RXON_CTX_BSS];
        u16 ch;

        IWL_DEBUG_MAC80211(priv, "enter\n");

        mutex_lock(&priv->mutex);

        if (iwl_legacy_is_rfkill(priv))
                goto out;

        if (test_bit(STATUS_EXIT_PENDING, &priv->status) ||
            test_bit(STATUS_SCANNING, &priv->status) ||
            test_bit(STATUS_CHANNEL_SWITCH_PENDING, &priv->status))
                goto out;

        if (!iwl_legacy_is_associated_ctx(ctx))
                goto out;

        if (!priv->cfg->ops->lib->set_channel_switch)
                goto out;

        ch = channel->hw_value;
        if (le16_to_cpu(ctx->active.channel) == ch)
                goto out;

        ch_info = iwl_legacy_get_channel_info(priv, channel->band, ch);
        if (!iwl_legacy_is_channel_valid(ch_info)) {
                IWL_DEBUG_MAC80211(priv, "invalid channel\n");
                goto out;
        }

        spin_lock_irq(&priv->lock);

        priv->current_ht_config.smps = conf->smps_mode;

        /* Configure HT40 channels */
        ctx->ht.enabled = conf_is_ht(conf);
        if (ctx->ht.enabled) {
                if (conf_is_ht40_minus(conf)) {
                        ctx->ht.extension_chan_offset =
                                IEEE80211_HT_PARAM_CHA_SEC_BELOW;
                        ctx->ht.is_40mhz = true;
                } else if (conf_is_ht40_plus(conf)) {
                        ctx->ht.extension_chan_offset =
                                IEEE80211_HT_PARAM_CHA_SEC_ABOVE;
                        ctx->ht.is_40mhz = true;
                } else {
                        ctx->ht.extension_chan_offset =
                                IEEE80211_HT_PARAM_CHA_SEC_NONE;
                        ctx->ht.is_40mhz = false;
                }
        } else
                ctx->ht.is_40mhz = false;

        if ((le16_to_cpu(ctx->staging.channel) != ch))
                ctx->staging.flags = 0;

        iwl_legacy_set_rxon_channel(priv, channel, ctx);
        iwl_legacy_set_rxon_ht(priv, ht_conf);
        iwl_legacy_set_flags_for_band(priv, ctx, channel->band, ctx->vif);

        spin_unlock_irq(&priv->lock);

        iwl_legacy_set_rate(priv);
        /*
         * at this point, staging_rxon has the
         * configuration for channel switch
         */
        set_bit(STATUS_CHANNEL_SWITCH_PENDING, &priv->status);
        priv->switch_channel = cpu_to_le16(ch);
        if (priv->cfg->ops->lib->set_channel_switch(priv, ch_switch)) {
                clear_bit(STATUS_CHANNEL_SWITCH_PENDING, &priv->status);
                priv->switch_channel = 0;
                ieee80211_chswitch_done(ctx->vif, false);
        }

out:
        mutex_unlock(&priv->mutex);
        IWL_DEBUG_MAC80211(priv, "leave\n");
}

void iwl4965_configure_filter(struct ieee80211_hw *hw,
                             unsigned int changed_flags,
                             unsigned int *total_flags,
                             u64 multicast)
{
        struct iwl_priv *priv = hw->priv;
        __le32 filter_or = 0, filter_nand = 0;
        struct iwl_rxon_context *ctx;

#define CHK(test, flag) do { \
        if (*total_flags & (test))              \
                filter_or |= (flag);            \
        else                                    \
                filter_nand |= (flag);          \
        } while (0)

        IWL_DEBUG_MAC80211(priv, "Enter: changed: 0x%x, total: 0x%x\n",
                        changed_flags, *total_flags);

        CHK(FIF_OTHER_BSS | FIF_PROMISC_IN_BSS, RXON_FILTER_PROMISC_MSK);
        /* Setting _just_ RXON_FILTER_CTL2HOST_MSK causes FH errors */
        CHK(FIF_CONTROL, RXON_FILTER_CTL2HOST_MSK | RXON_FILTER_PROMISC_MSK);
        CHK(FIF_BCN_PRBRESP_PROMISC, RXON_FILTER_BCON_AWARE_MSK);

#undef CHK

        mutex_lock(&priv->mutex);

        for_each_context(priv, ctx) {
                ctx->staging.filter_flags &= ~filter_nand;
                ctx->staging.filter_flags |= filter_or;

                /*
                 * Not committing directly because hardware can perform a scan,
                 * but we'll eventually commit the filter flags change anyway.
                 */
        }

        mutex_unlock(&priv->mutex);

        /*
         * Receiving all multicast frames is always enabled by the
         * default flags setup in iwl_legacy_connection_init_rx_config()
         * since we currently do not support programming multicast
         * filters into the device.
         */
        *total_flags &= FIF_OTHER_BSS | FIF_ALLMULTI | FIF_PROMISC_IN_BSS |
                        FIF_BCN_PRBRESP_PROMISC | FIF_CONTROL;
}

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

static void iwl4965_bg_txpower_work(struct work_struct *work)
{
        struct iwl_priv *priv = container_of(work, struct iwl_priv,
                        txpower_work);

        mutex_lock(&priv->mutex);

        /* If a scan happened to start before we got here
         * then just return; the statistics notification will
         * kick off another scheduled work to compensate for
         * any temperature delta we missed here. */
        if (test_bit(STATUS_EXIT_PENDING, &priv->status) ||
            test_bit(STATUS_SCANNING, &priv->status))
                goto out;

        /* Regardless of if we are associated, we must reconfigure the
         * TX power since frames can be sent on non-radar channels while
         * not associated */
        priv->cfg->ops->lib->send_tx_power(priv);

        /* Update last_temperature to keep is_calib_needed from running
         * when it isn't needed... */
        priv->last_temperature = priv->temperature;
out:
        mutex_unlock(&priv->mutex);
}

static void iwl4965_setup_deferred_work(struct iwl_priv *priv)
{
        priv->workqueue = create_singlethread_workqueue(DRV_NAME);

        init_waitqueue_head(&priv->wait_command_queue);

        INIT_WORK(&priv->restart, iwl4965_bg_restart);
        INIT_WORK(&priv->rx_replenish, iwl4965_bg_rx_replenish);
        INIT_WORK(&priv->run_time_calib_work, iwl4965_bg_run_time_calib_work);
        INIT_DELAYED_WORK(&priv->init_alive_start, iwl4965_bg_init_alive_start);
        INIT_DELAYED_WORK(&priv->alive_start, iwl4965_bg_alive_start);

        iwl_legacy_setup_scan_deferred_work(priv);

        INIT_WORK(&priv->txpower_work, iwl4965_bg_txpower_work);

        init_timer(&priv->statistics_periodic);
        priv->statistics_periodic.data = (unsigned long)priv;
        priv->statistics_periodic.function = iwl4965_bg_statistics_periodic;

        init_timer(&priv->watchdog);
        priv->watchdog.data = (unsigned long)priv;
        priv->watchdog.function = iwl_legacy_bg_watchdog;

        tasklet_init(&priv->irq_tasklet, (void (*)(unsigned long))
                iwl4965_irq_tasklet, (unsigned long)priv);
}

static void iwl4965_cancel_deferred_work(struct iwl_priv *priv)
{
        cancel_work_sync(&priv->txpower_work);
        cancel_delayed_work_sync(&priv->init_alive_start);
        cancel_delayed_work(&priv->alive_start);
        cancel_work_sync(&priv->run_time_calib_work);

        iwl_legacy_cancel_scan_deferred_work(priv);

        del_timer_sync(&priv->statistics_periodic);
}

static void iwl4965_init_hw_rates(struct iwl_priv *priv,
                              struct ieee80211_rate *rates)
{
        int i;

        for (i = 0; i < IWL_RATE_COUNT_LEGACY; i++) {
                rates[i].bitrate = iwlegacy_rates[i].ieee * 5;
                rates[i].hw_value = i; /* Rate scaling will work on indexes */
                rates[i].hw_value_short = i;
                rates[i].flags = 0;
                if ((i >= IWL_FIRST_CCK_RATE) && (i <= IWL_LAST_CCK_RATE)) {
                        /*
                         * If CCK != 1M then set short preamble rate flag.
                         */
                        rates[i].flags |=
                                (iwlegacy_rates[i].plcp == IWL_RATE_1M_PLCP) ?
                                        0 : IEEE80211_RATE_SHORT_PREAMBLE;
                }
        }
}
/*
 * Acquire priv->lock before calling this function !
 */
void iwl4965_set_wr_ptrs(struct iwl_priv *priv, int txq_id, u32 index)
{
        iwl_legacy_write_direct32(priv, HBUS_TARG_WRPTR,
                             (index & 0xff) | (txq_id << 8));
        iwl_legacy_write_prph(priv, IWL49_SCD_QUEUE_RDPTR(txq_id), index);
}

void iwl4965_tx_queue_set_status(struct iwl_priv *priv,
                                        struct iwl_tx_queue *txq,
                                        int tx_fifo_id, int scd_retry)
{
        int txq_id = txq->q.id;

        /* Find out whether to activate Tx queue */
        int active = test_bit(txq_id, &priv->txq_ctx_active_msk) ? 1 : 0;

        /* Set up and activate */
        iwl_legacy_write_prph(priv, IWL49_SCD_QUEUE_STATUS_BITS(txq_id),
                         (active << IWL49_SCD_QUEUE_STTS_REG_POS_ACTIVE) |
                         (tx_fifo_id << IWL49_SCD_QUEUE_STTS_REG_POS_TXF) |
                         (scd_retry << IWL49_SCD_QUEUE_STTS_REG_POS_WSL) |
                         (scd_retry << IWL49_SCD_QUEUE_STTS_REG_POS_SCD_ACK) |
                         IWL49_SCD_QUEUE_STTS_REG_MSK);

        txq->sched_retry = scd_retry;

        IWL_DEBUG_INFO(priv, "%s %s Queue %d on AC %d\n",
                       active ? "Activate" : "Deactivate",
                       scd_retry ? "BA" : "AC", txq_id, tx_fifo_id);
}


static int iwl4965_init_drv(struct iwl_priv *priv)
{
        int ret;

        spin_lock_init(&priv->sta_lock);
        spin_lock_init(&priv->hcmd_lock);

        INIT_LIST_HEAD(&priv->free_frames);

        mutex_init(&priv->mutex);

        priv->ieee_channels = NULL;
        priv->ieee_rates = NULL;
        priv->band = IEEE80211_BAND_2GHZ;

        priv->iw_mode = NL80211_IFTYPE_STATION;
        priv->current_ht_config.smps = IEEE80211_SMPS_STATIC;
        priv->missed_beacon_threshold = IWL_MISSED_BEACON_THRESHOLD_DEF;

        /* initialize force reset */
        priv->force_reset.reset_duration = IWL_DELAY_NEXT_FORCE_FW_RELOAD;

        /* Choose which receivers/antennas to use */
        if (priv->cfg->ops->hcmd->set_rxon_chain)
                priv->cfg->ops->hcmd->set_rxon_chain(priv,
                                        &priv->contexts[IWL_RXON_CTX_BSS]);

        iwl_legacy_init_scan_params(priv);

        ret = iwl_legacy_init_channel_map(priv);
        if (ret) {
                IWL_ERR(priv, "initializing regulatory failed: %d\n", ret);
                goto err;
        }

        ret = iwl_legacy_init_geos(priv);
        if (ret) {
                IWL_ERR(priv, "initializing geos failed: %d\n", ret);
                goto err_free_channel_map;
        }
        iwl4965_init_hw_rates(priv, priv->ieee_rates);

        return 0;

err_free_channel_map:
        iwl_legacy_free_channel_map(priv);
err:
        return ret;
}

static void iwl4965_uninit_drv(struct iwl_priv *priv)
{
        iwl4965_calib_free_results(priv);
        iwl_legacy_free_geos(priv);
        iwl_legacy_free_channel_map(priv);
        kfree(priv->scan_cmd);
}

static void iwl4965_hw_detect(struct iwl_priv *priv)
{
        priv->hw_rev = _iwl_legacy_read32(priv, CSR_HW_REV);
        priv->hw_wa_rev = _iwl_legacy_read32(priv, CSR_HW_REV_WA_REG);
        priv->rev_id = priv->pci_dev->revision;
        IWL_DEBUG_INFO(priv, "HW Revision ID = 0x%X\n", priv->rev_id);
}

static int iwl4965_set_hw_params(struct iwl_priv *priv)
{
        priv->hw_params.max_rxq_size = RX_QUEUE_SIZE;
        priv->hw_params.max_rxq_log = RX_QUEUE_SIZE_LOG;
        if (priv->cfg->mod_params->amsdu_size_8K)
                priv->hw_params.rx_page_order = get_order(IWL_RX_BUF_SIZE_8K);
        else
                priv->hw_params.rx_page_order = get_order(IWL_RX_BUF_SIZE_4K);

        priv->hw_params.max_beacon_itrvl = IWL_MAX_UCODE_BEACON_INTERVAL;

        if (priv->cfg->mod_params->disable_11n)
                priv->cfg->sku &= ~IWL_SKU_N;

        /* Device-specific setup */
        return priv->cfg->ops->lib->set_hw_params(priv);
}

static const u8 iwl4965_bss_ac_to_fifo[] = {
        IWL_TX_FIFO_VO,
        IWL_TX_FIFO_VI,
        IWL_TX_FIFO_BE,
        IWL_TX_FIFO_BK,
};

static const u8 iwl4965_bss_ac_to_queue[] = {
        0, 1, 2, 3,
};

static int
iwl4965_pci_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
{
        int err = 0, i;
        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
         ************************/

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

        /*
         * The default context is always valid,
         * more may be discovered when firmware
         * is loaded.
         */
        priv->valid_contexts = BIT(IWL_RXON_CTX_BSS);

        for (i = 0; i < NUM_IWL_RXON_CTX; i++)
                priv->contexts[i].ctxid = i;

        priv->contexts[IWL_RXON_CTX_BSS].always_active = true;
        priv->contexts[IWL_RXON_CTX_BSS].is_active = true;
        priv->contexts[IWL_RXON_CTX_BSS].rxon_cmd = REPLY_RXON;
        priv->contexts[IWL_RXON_CTX_BSS].rxon_timing_cmd = REPLY_RXON_TIMING;
        priv->contexts[IWL_RXON_CTX_BSS].rxon_assoc_cmd = REPLY_RXON_ASSOC;
        priv->contexts[IWL_RXON_CTX_BSS].qos_cmd = REPLY_QOS_PARAM;
        priv->contexts[IWL_RXON_CTX_BSS].ap_sta_id = IWL_AP_ID;
        priv->contexts[IWL_RXON_CTX_BSS].wep_key_cmd = REPLY_WEPKEY;
        priv->contexts[IWL_RXON_CTX_BSS].ac_to_fifo = iwl4965_bss_ac_to_fifo;
        priv->contexts[IWL_RXON_CTX_BSS].ac_to_queue = iwl4965_bss_ac_to_queue;
        priv->contexts[IWL_RXON_CTX_BSS].exclusive_interface_modes =
                BIT(NL80211_IFTYPE_ADHOC);
        priv->contexts[IWL_RXON_CTX_BSS].interface_modes =
                BIT(NL80211_IFTYPE_STATION);
        priv->contexts[IWL_RXON_CTX_BSS].ap_devtype = RXON_DEV_TYPE_AP;
        priv->contexts[IWL_RXON_CTX_BSS].ibss_devtype = RXON_DEV_TYPE_IBSS;
        priv->contexts[IWL_RXON_CTX_BSS].station_devtype = RXON_DEV_TYPE_ESS;
        priv->contexts[IWL_RXON_CTX_BSS].unused_devtype = RXON_DEV_TYPE_ESS;

        BUILD_BUG_ON(NUM_IWL_RXON_CTX != 1);

        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;

        if (iwl_legacy_alloc_traffic_mem(priv))
                IWL_ERR(priv, "Not enough memory to generate traffic log\n");

        /**************************
         * 2. Initializing PCI bus
         **************************/
        pci_disable_link_state(pdev, PCIE_LINK_STATE_L0S | PCIE_LINK_STATE_L1 |
                                PCIE_LINK_STATE_CLKPM);

        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);

        /* these spin locks will be used in apm_ops.init and EEPROM access
         * we should init now
         */
        spin_lock_init(&priv->reg_lock);
        spin_lock_init(&priv->lock);

        /*
         * stop and reset the on-board processor just in case it is in a
         * strange state ... like being left stranded by a primary kernel
         * and this is now the kdump kernel trying to start up
         */
        iwl_write32(priv, CSR_RESET, CSR_RESET_REG_FLAG_NEVO_RESET);

        iwl4965_hw_detect(priv);
        IWL_INFO(priv, "Detected %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);

        iwl4965_prepare_card_hw(priv);
        if (!priv->hw_ready) {
                IWL_WARN(priv, "Failed, HW not ready\n");
                goto out_iounmap;
        }