/******************************************************************************
 *
 * 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/ieee80211_radiotap.h>
#include <net/mac80211.h>

#include <asm/div64.h>

#define DRV_NAME        "iwl3945"

#include "iwl-fh.h"
#include "iwl-3945-fh.h"
#include "iwl-commands.h"
#include "iwl-sta.h"
#include "iwl-3945.h"
#include "iwl-core.h"
#include "iwl-helpers.h"
#include "iwl-dev.h"
#include "iwl-spectrum.h"

/*
 * module name, copyright, version, etc.
 */

#define DRV_DESCRIPTION \
"Intel(R) PRO/Wireless 3945ABG/BG Network Connection driver for Linux"

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

/*
 * add "s" to indicate spectrum measurement included.
 * we add it here to be consistent with previous releases in which
 * this was configurable.
 */
#define DRV_VERSION  IWLWIFI_VERSION VD "s"
#define DRV_COPYRIGHT   "Copyright(c) 2003-2011 Intel Corporation"
#define DRV_AUTHOR     "<ilw@linux.intel.com>"

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

 /* module parameters */
struct iwl_mod_params iwl3945_mod_params = {
        .sw_crypto = 1,
        .restart_fw = 1,
        .disable_hw_scan = 1,
        /* the rest are 0 by default */
};

/**
 * iwl3945_get_antenna_flags - Get antenna flags for RXON command
 * @priv: eeprom and antenna fields are used to determine antenna flags
 *
 * priv->eeprom39  is used to determine if antenna AUX/MAIN are reversed
 * iwl3945_mod_params.antenna specifies the antenna diversity mode:
 *
 * IWL_ANTENNA_DIVERSITY - NIC selects best antenna by itself
 * IWL_ANTENNA_MAIN      - Force MAIN antenna
 * IWL_ANTENNA_AUX       - Force AUX antenna
 */
__le32 iwl3945_get_antenna_flags(const struct iwl_priv *priv)
{
        struct iwl3945_eeprom *eeprom = (struct iwl3945_eeprom *)priv->eeprom;

        switch (iwl3945_mod_params.antenna) {
        case IWL_ANTENNA_DIVERSITY:
                return 0;

        case IWL_ANTENNA_MAIN:
                if (eeprom->antenna_switch_type)
                        return RXON_FLG_DIS_DIV_MSK | RXON_FLG_ANT_B_MSK;
                return RXON_FLG_DIS_DIV_MSK | RXON_FLG_ANT_A_MSK;

        case IWL_ANTENNA_AUX:
                if (eeprom->antenna_switch_type)
                        return RXON_FLG_DIS_DIV_MSK | RXON_FLG_ANT_A_MSK;
                return RXON_FLG_DIS_DIV_MSK | RXON_FLG_ANT_B_MSK;
        }

        /* bad antenna selector value */
        IWL_ERR(priv, "Bad antenna selector value (0x%x)\n",
                iwl3945_mod_params.antenna);

        return 0;               /* "diversity" is default if error */
}

static int iwl3945_set_ccmp_dynamic_key_info(struct iwl_priv *priv,
                                   struct ieee80211_key_conf *keyconf,
                                   u8 sta_id)
{
        unsigned long flags;
        __le16 key_flags = 0;
        int ret;

        key_flags |= (STA_KEY_FLG_CCMP | STA_KEY_FLG_MAP_KEY_MSK);
        key_flags |= cpu_to_le16(keyconf->keyidx << STA_KEY_FLG_KEYID_POS);

        if (sta_id == priv->contexts[IWL_RXON_CTX_BSS].bcast_sta_id)
                key_flags |= STA_KEY_MULTICAST_MSK;

        keyconf->flags |= IEEE80211_KEY_FLAG_GENERATE_IV;
        keyconf->hw_key_idx = keyconf->keyidx;
        key_flags &= ~STA_KEY_FLG_INVALID;

        spin_lock_irqsave(&priv->sta_lock, flags);
        priv->stations[sta_id].keyinfo.cipher = keyconf->cipher;
        priv->stations[sta_id].keyinfo.keylen = keyconf->keylen;
        memcpy(priv->stations[sta_id].keyinfo.key, keyconf->key,
               keyconf->keylen);

        memcpy(priv->stations[sta_id].sta.key.key, keyconf->key,
               keyconf->keylen);

        if ((priv->stations[sta_id].sta.key.key_flags & STA_KEY_FLG_ENCRYPT_MSK)
                        == STA_KEY_FLG_NO_ENC)
                priv->stations[sta_id].sta.key.key_offset =
                                 iwl_legacy_get_free_ucode_key_index(priv);
        /* else, we are overriding an existing key => no need to allocated room
        * in uCode. */

        WARN(priv->stations[sta_id].sta.key.key_offset == WEP_INVALID_OFFSET,
                "no space for a new key");

        priv->stations[sta_id].sta.key.key_flags = key_flags;
        priv->stations[sta_id].sta.sta.modify_mask = STA_MODIFY_KEY_MASK;
        priv->stations[sta_id].sta.mode = STA_CONTROL_MODIFY_MSK;

        IWL_DEBUG_INFO(priv, "hwcrypto: modify ucode station key info\n");

        ret = iwl_legacy_send_add_sta(priv,
                                &priv->stations[sta_id].sta, CMD_ASYNC);

        spin_unlock_irqrestore(&priv->sta_lock, flags);

        return ret;
}

static int iwl3945_set_tkip_dynamic_key_info(struct iwl_priv *priv,
                                  struct ieee80211_key_conf *keyconf,
                                  u8 sta_id)
{
        return -EOPNOTSUPP;
}

static int iwl3945_set_wep_dynamic_key_info(struct iwl_priv *priv,
                                  struct ieee80211_key_conf *keyconf,
                                  u8 sta_id)
{
        return -EOPNOTSUPP;
}

static int iwl3945_clear_sta_key_info(struct iwl_priv *priv, u8 sta_id)
{
        unsigned long flags;
        struct iwl_legacy_addsta_cmd sta_cmd;

        spin_lock_irqsave(&priv->sta_lock, flags);
        memset(&priv->stations[sta_id].keyinfo, 0, sizeof(struct iwl_hw_key));
        memset(&priv->stations[sta_id].sta.key, 0,
                sizeof(struct iwl4965_keyinfo));
        priv->stations[sta_id].sta.key.key_flags = STA_KEY_FLG_NO_ENC;
        priv->stations[sta_id].sta.sta.modify_mask = STA_MODIFY_KEY_MASK;
        priv->stations[sta_id].sta.mode = STA_CONTROL_MODIFY_MSK;
        memcpy(&sta_cmd, &priv->stations[sta_id].sta, sizeof(struct iwl_legacy_addsta_cmd));
        spin_unlock_irqrestore(&priv->sta_lock, flags);

        IWL_DEBUG_INFO(priv, "hwcrypto: clear ucode station key info\n");
        return iwl_legacy_send_add_sta(priv, &sta_cmd, CMD_SYNC);
}

static int iwl3945_set_dynamic_key(struct iwl_priv *priv,
                        struct ieee80211_key_conf *keyconf, u8 sta_id)
{
        int ret = 0;

        keyconf->hw_key_idx = HW_KEY_DYNAMIC;

        switch (keyconf->cipher) {
        case WLAN_CIPHER_SUITE_CCMP:
                ret = iwl3945_set_ccmp_dynamic_key_info(priv, keyconf, sta_id);
                break;
        case WLAN_CIPHER_SUITE_TKIP:
                ret = iwl3945_set_tkip_dynamic_key_info(priv, keyconf, sta_id);
                break;
        case WLAN_CIPHER_SUITE_WEP40:
        case WLAN_CIPHER_SUITE_WEP104:
                ret = iwl3945_set_wep_dynamic_key_info(priv, keyconf, sta_id);
                break;
        default:
                IWL_ERR(priv, "Unknown alg: %s alg=%x\n", __func__,
                        keyconf->cipher);
                ret = -EINVAL;
        }

        IWL_DEBUG_WEP(priv, "Set dynamic key: alg=%x len=%d idx=%d sta=%d ret=%d\n",
                      keyconf->cipher, keyconf->keylen, keyconf->keyidx,
                      sta_id, ret);

        return ret;
}

static int iwl3945_remove_static_key(struct iwl_priv *priv)
{
        int ret = -EOPNOTSUPP;

        return ret;
}

static int iwl3945_set_static_key(struct iwl_priv *priv,
                                struct ieee80211_key_conf *key)
{
        if (key->cipher == WLAN_CIPHER_SUITE_WEP40 ||
            key->cipher == WLAN_CIPHER_SUITE_WEP104)
                return -EOPNOTSUPP;

        IWL_ERR(priv, "Static key invalid: cipher %x\n", key->cipher);
        return -EINVAL;
}

static void iwl3945_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 iwl3945_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 iwl3945_frame *iwl3945_get_free_frame(struct iwl_priv *priv)
{
        struct iwl3945_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 iwl3945_frame, list);
}

static void iwl3945_free_frame(struct iwl_priv *priv, struct iwl3945_frame *frame)
{
        memset(frame, 0, sizeof(*frame));
        list_add(&frame->list, &priv->free_frames);
}

unsigned int iwl3945_fill_beacon_frame(struct iwl_priv *priv,
                                struct ieee80211_hdr *hdr,
                                int left)
{

        if (!iwl_legacy_is_associated(priv, IWL_RXON_CTX_BSS) || !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;
}

static int iwl3945_send_beacon_cmd(struct iwl_priv *priv)
{
        struct iwl3945_frame *frame;
        unsigned int frame_size;
        int rc;
        u8 rate;

        frame = iwl3945_get_free_frame(priv);

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

        rate = iwl_legacy_get_lowest_plcp(priv,
                                &priv->contexts[IWL_RXON_CTX_BSS]);

        frame_size = iwl3945_hw_get_beacon_cmd(priv, frame, rate);

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

        iwl3945_free_frame(priv, frame);

        return rc;
}

static void iwl3945_unset_hw_params(struct iwl_priv *priv)
{
        if (priv->_3945.shared_virt)
                dma_free_coherent(&priv->pci_dev->dev,
                                  sizeof(struct iwl3945_shared),
                                  priv->_3945.shared_virt,
                                  priv->_3945.shared_phys);
}

static void iwl3945_build_tx_cmd_hwcrypto(struct iwl_priv *priv,
                                      struct ieee80211_tx_info *info,
                                      struct iwl_device_cmd *cmd,
                                      struct sk_buff *skb_frag,
                                      int sta_id)
{
        struct iwl3945_tx_cmd *tx_cmd = (struct iwl3945_tx_cmd *)cmd->cmd.payload;
        struct iwl_hw_key *keyinfo = &priv->stations[sta_id].keyinfo;

        tx_cmd->sec_ctl = 0;

        switch (keyinfo->cipher) {
        case WLAN_CIPHER_SUITE_CCMP:
                tx_cmd->sec_ctl = TX_CMD_SEC_CCM;
                memcpy(tx_cmd->key, keyinfo->key, keyinfo->keylen);
                IWL_DEBUG_TX(priv, "tx_cmd with AES hwcrypto\n");
                break;

        case WLAN_CIPHER_SUITE_TKIP:
                break;

        case WLAN_CIPHER_SUITE_WEP104:
                tx_cmd->sec_ctl |= TX_CMD_SEC_KEY128;
                /* fall through */
        case WLAN_CIPHER_SUITE_WEP40:
                tx_cmd->sec_ctl |= TX_CMD_SEC_WEP |
                    (info->control.hw_key->hw_key_idx & TX_CMD_SEC_MSK) << TX_CMD_SEC_SHIFT;

                memcpy(&tx_cmd->key[3], keyinfo->key, keyinfo->keylen);

                IWL_DEBUG_TX(priv, "Configuring packet for WEP encryption "
                             "with key %d\n", info->control.hw_key->hw_key_idx);
                break;

        default:
                IWL_ERR(priv, "Unknown encode cipher %x\n", keyinfo->cipher);
                break;
        }
}

/*
 * handle build REPLY_TX command notification.
 */
static void iwl3945_build_tx_cmd_basic(struct iwl_priv *priv,
                                  struct iwl_device_cmd *cmd,
                                  struct ieee80211_tx_info *info,
                                  struct ieee80211_hdr *hdr, u8 std_id)
{
        struct iwl3945_tx_cmd *tx_cmd = (struct iwl3945_tx_cmd *)cmd->cmd.payload;
        __le32 tx_flags = tx_cmd->tx_flags;
        __le16 fc = hdr->frame_control;

        tx_cmd->stop_time.life_time = TX_CMD_LIFE_TIME_INFINITE;
        if (!(info->flags & IEEE80211_TX_CTL_NO_ACK)) {
                tx_flags |= TX_CMD_FLG_ACK_MSK;
                if (ieee80211_is_mgmt(fc))
                        tx_flags |= TX_CMD_FLG_SEQ_CTL_MSK;
                if (ieee80211_is_probe_resp(fc) &&
                    !(le16_to_cpu(hdr->seq_ctrl) & 0xf))
                        tx_flags |= TX_CMD_FLG_TSF_MSK;
        } else {
                tx_flags &= (~TX_CMD_FLG_ACK_MSK);
                tx_flags |= TX_CMD_FLG_SEQ_CTL_MSK;
        }

        tx_cmd->sta_id = std_id;
        if (ieee80211_has_morefrags(fc))
                tx_flags |= TX_CMD_FLG_MORE_FRAG_MSK;

        if (ieee80211_is_data_qos(fc)) {
                u8 *qc = ieee80211_get_qos_ctl(hdr);
                tx_cmd->tid_tspec = qc[0] & 0xf;
                tx_flags &= ~TX_CMD_FLG_SEQ_CTL_MSK;
        } else {
                tx_flags |= TX_CMD_FLG_SEQ_CTL_MSK;
        }

        iwl_legacy_tx_cmd_protection(priv, info, fc, &tx_flags);

        tx_flags &= ~(TX_CMD_FLG_ANT_SEL_MSK);
        if (ieee80211_is_mgmt(fc)) {
                if (ieee80211_is_assoc_req(fc) || ieee80211_is_reassoc_req(fc))
                        tx_cmd->timeout.pm_frame_timeout = cpu_to_le16(3);
                else
                        tx_cmd->timeout.pm_frame_timeout = cpu_to_le16(2);
        } else {
                tx_cmd->timeout.pm_frame_timeout = 0;
        }

        tx_cmd->driver_txop = 0;
        tx_cmd->tx_flags = tx_flags;
        tx_cmd->next_frame_len = 0;
}

/*
 * start REPLY_TX command process
 */
static int iwl3945_tx_skb(struct iwl_priv *priv, struct sk_buff *skb)
{
        struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
        struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
        struct iwl3945_tx_cmd *tx_cmd;
        struct iwl_tx_queue *txq = NULL;
        struct iwl_queue *q = NULL;
        struct iwl_device_cmd *out_cmd;
        struct iwl_cmd_meta *out_meta;
        dma_addr_t phys_addr;
        dma_addr_t txcmd_phys;
        int txq_id = skb_get_queue_mapping(skb);
        u16 len, idx, hdr_len;
        u8 id;
        u8 unicast;
        u8 sta_id;
        u8 tid = 0;
        __le16 fc;
        u8 wait_write_ptr = 0;
        unsigned long flags;

        spin_lock_irqsave(&priv->lock, flags);
        if (iwl_legacy_is_rfkill(priv)) {
                IWL_DEBUG_DROP(priv, "Dropping - RF KILL\n");
                goto drop_unlock;
        }

        if ((ieee80211_get_tx_rate(priv->hw, info)->hw_value & 0xFF) == IWL_INVALID_RATE) {
                IWL_ERR(priv, "ERROR: No TX rate available.\n");
                goto drop_unlock;
        }

        unicast = !is_multicast_ether_addr(hdr->addr1);
        id = 0;

        fc = hdr->frame_control;

#ifdef CONFIG_IWLWIFI_LEGACY_DEBUG
        if (ieee80211_is_auth(fc))
                IWL_DEBUG_TX(priv, "Sending AUTH frame\n");
        else if (ieee80211_is_assoc_req(fc))
                IWL_DEBUG_TX(priv, "Sending ASSOC frame\n");
        else if (ieee80211_is_reassoc_req(fc))
                IWL_DEBUG_TX(priv, "Sending REASSOC frame\n");
#endif

        spin_unlock_irqrestore(&priv->lock, flags);

        hdr_len = ieee80211_hdrlen(fc);

        /* Find index into station table for destination station */
        sta_id = iwl_legacy_sta_id_or_broadcast(
                        priv, &priv->contexts[IWL_RXON_CTX_BSS],
                        info->control.sta);
        if (sta_id == IWL_INVALID_STATION) {
                IWL_DEBUG_DROP(priv, "Dropping - INVALID STATION: %pM\n",
                               hdr->addr1);
                goto drop;
        }

        IWL_DEBUG_RATE(priv, "station Id %d\n", sta_id);

        if (ieee80211_is_data_qos(fc)) {
                u8 *qc = ieee80211_get_qos_ctl(hdr);
                tid = qc[0] & IEEE80211_QOS_CTL_TID_MASK;
                if (unlikely(tid >= MAX_TID_COUNT))
                        goto drop;
        }

        /* Descriptor for chosen Tx queue */
        txq = &priv->txq[txq_id];
        q = &txq->q;

        if ((iwl_legacy_queue_space(q) < q->high_mark))
                goto drop;

        spin_lock_irqsave(&priv->lock, flags);

        idx = iwl_legacy_get_cmd_index(q, q->write_ptr, 0);

        /* Set up driver data for this TFD */
        memset(&(txq->txb[q->write_ptr]), 0, sizeof(struct iwl_tx_info));
        txq->txb[q->write_ptr].skb = skb;
        txq->txb[q->write_ptr].ctx = &priv->contexts[IWL_RXON_CTX_BSS];

        /* Init first empty entry in queue's array of Tx/cmd buffers */
        out_cmd = txq->cmd[idx];
        out_meta = &txq->meta[idx];
        tx_cmd = (struct iwl3945_tx_cmd *)out_cmd->cmd.payload;
        memset(&out_cmd->hdr, 0, sizeof(out_cmd->hdr));
        memset(tx_cmd, 0, sizeof(*tx_cmd));

        /*
         * Set up the Tx-command (not MAC!) header.
         * Store the chosen Tx queue and TFD index within the sequence field;
         * after Tx, uCode's Tx response will return this value so driver can
         * locate the frame within the tx queue and do post-tx processing.
         */
        out_cmd->hdr.cmd = REPLY_TX;
        out_cmd->hdr.sequence = cpu_to_le16((u16)(QUEUE_TO_SEQ(txq_id) |
                                INDEX_TO_SEQ(q->write_ptr)));

        /* Copy MAC header from skb into command buffer */
        memcpy(tx_cmd->hdr, hdr, hdr_len);


        if (info->control.hw_key)
                iwl3945_build_tx_cmd_hwcrypto(priv, info, out_cmd, skb, sta_id);

        /* TODO need this for burst mode later on */
        iwl3945_build_tx_cmd_basic(priv, out_cmd, info, hdr, sta_id);

        /* set is_hcca to 0; it probably will never be implemented */
        iwl3945_hw_build_tx_cmd_rate(priv, out_cmd, info, hdr, sta_id, 0);

        /* Total # bytes to be transmitted */
        len = (u16)skb->len;
        tx_cmd->len = cpu_to_le16(len);

        iwl_legacy_dbg_log_tx_data_frame(priv, len, hdr);
        iwl_legacy_update_stats(priv, true, fc, len);
        tx_cmd->tx_flags &= ~TX_CMD_FLG_ANT_A_MSK;
        tx_cmd->tx_flags &= ~TX_CMD_FLG_ANT_B_MSK;

        if (!ieee80211_has_morefrags(hdr->frame_control)) {
                txq->need_update = 1;
        } else {
                wait_write_ptr = 1;
                txq->need_update = 0;
        }

        IWL_DEBUG_TX(priv, "sequence nr = 0X%x\n",
                     le16_to_cpu(out_cmd->hdr.sequence));
        IWL_DEBUG_TX(priv, "tx_flags = 0X%x\n", le32_to_cpu(tx_cmd->tx_flags));
        iwl_print_hex_dump(priv, IWL_DL_TX, tx_cmd, sizeof(*tx_cmd));
        iwl_print_hex_dump(priv, IWL_DL_TX, (u8 *)tx_cmd->hdr,
                           ieee80211_hdrlen(fc));

        /*
         * Use the first empty entry in this queue's command buffer array
         * to contain the Tx command and MAC header concatenated together
         * (payload data will be in another buffer).
         * Size of this varies, due to varying MAC header length.
         * If end is not dword aligned, we'll have 2 extra bytes at the end
         * of the MAC header (device reads on dword boundaries).
         * We'll tell device about this padding later.
         */
        len = sizeof(struct iwl3945_tx_cmd) +
                        sizeof(struct iwl_cmd_header) + hdr_len;
        len = (len + 3) & ~3;

        /* Physical address of this Tx command's header (not MAC header!),
         * within command buffer array. */
        txcmd_phys = pci_map_single(priv->pci_dev, &out_cmd->hdr,
                                    len, PCI_DMA_TODEVICE);
        /* we do not map meta data ... so we can safely access address to
         * provide to unmap command*/
        dma_unmap_addr_set(out_meta, mapping, txcmd_phys);
        dma_unmap_len_set(out_meta, len, len);

        /* Add buffer containing Tx command and MAC(!) header to TFD's
         * first entry */
        priv->cfg->ops->lib->txq_attach_buf_to_tfd(priv, txq,
                                                   txcmd_phys, len, 1, 0);


        /* Set up TFD's 2nd entry to point directly to remainder of skb,
         * if any (802.11 null frames have no payload). */
        len = skb->len - hdr_len;
        if (len) {
                phys_addr = pci_map_single(priv->pci_dev, skb->data + hdr_len,
                                           len, PCI_DMA_TODEVICE);
                priv->cfg->ops->lib->txq_attach_buf_to_tfd(priv, txq,
                                                           phys_addr, len,
                                                           0, U32_PAD(len));
        }


        /* Tell device the write index *just past* this latest filled TFD */
        q->write_ptr = iwl_legacy_queue_inc_wrap(q->write_ptr, q->n_bd);
        iwl_legacy_txq_update_write_ptr(priv, txq);
        spin_unlock_irqrestore(&priv->lock, flags);

        if ((iwl_legacy_queue_space(q) < q->high_mark)
            && priv->mac80211_registered) {
                if (wait_write_ptr) {
                        spin_lock_irqsave(&priv->lock, flags);
                        txq->need_update = 1;
                        iwl_legacy_txq_update_write_ptr(priv, txq);
                        spin_unlock_irqrestore(&priv->lock, flags);
                }

                iwl_legacy_stop_queue(priv, txq);
        }

        return 0;

drop_unlock:
        spin_unlock_irqrestore(&priv->lock, flags);
drop:
        return -1;
}

static int iwl3945_get_measurement(struct iwl_priv *priv,
                               struct ieee80211_measurement_params *params,
                               u8 type)
{
        struct iwl_spectrum_cmd spectrum;
        struct iwl_rx_packet *pkt;
        struct iwl_host_cmd cmd = {
                .id = REPLY_SPECTRUM_MEASUREMENT_CMD,
                .data = (void *)&spectrum,
                .flags = CMD_WANT_SKB,
        };
        u32 add_time = le64_to_cpu(params->start_time);
        int rc;
        int spectrum_resp_status;
        int duration = le16_to_cpu(params->duration);
        struct iwl_rxon_context *ctx = &priv->contexts[IWL_RXON_CTX_BSS];

        if (iwl_legacy_is_associated(priv, IWL_RXON_CTX_BSS))
                add_time = iwl_legacy_usecs_to_beacons(priv,
                        le64_to_cpu(params->start_time) - priv->_3945.last_tsf,
                        le16_to_cpu(ctx->timing.beacon_interval));

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

        spectrum.channel_count = cpu_to_le16(1);
        spectrum.flags =
            RXON_FLG_TSF2HOST_MSK | RXON_FLG_ANT_A_MSK | RXON_FLG_DIS_DIV_MSK;
        spectrum.filter_flags = MEASUREMENT_FILTER_FLAG;
        cmd.len = sizeof(spectrum);
        spectrum.len = cpu_to_le16(cmd.len - sizeof(spectrum.len));

        if (iwl_legacy_is_associated(priv, IWL_RXON_CTX_BSS))
                spectrum.start_time =
                        iwl_legacy_add_beacon_time(priv,
                                priv->_3945.last_beacon_time, add_time,
                                le16_to_cpu(ctx->timing.beacon_interval));
        else
                spectrum.start_time = 0;

        spectrum.channels[0].duration = cpu_to_le32(duration * TIME_UNIT);
        spectrum.channels[0].channel = params->channel;
        spectrum.channels[0].type = type;
        if (ctx->active.flags & RXON_FLG_BAND_24G_MSK)
                spectrum.flags |= RXON_FLG_BAND_24G_MSK |
                    RXON_FLG_AUTO_DETECT_MSK | RXON_FLG_TGG_PROTECT_MSK;

        rc = iwl_legacy_send_cmd_sync(priv, &cmd);
        if (rc)
                return rc;

        pkt = (struct iwl_rx_packet *)cmd.reply_page;
        if (pkt->hdr.flags & IWL_CMD_FAILED_MSK) {
                IWL_ERR(priv, "Bad return from REPLY_RX_ON_ASSOC command\n");
                rc = -EIO;
        }

        spectrum_resp_status = le16_to_cpu(pkt->u.spectrum.status);
        switch (spectrum_resp_status) {
        case 0:         /* Command will be handled */
                if (pkt->u.spectrum.id != 0xff) {
                        IWL_DEBUG_INFO(priv, "Replaced existing measurement: %d\n",
                                                pkt->u.spectrum.id);
                        priv->measurement_status &= ~MEASUREMENT_READY;
                }
                priv->measurement_status |= MEASUREMENT_ACTIVE;
                rc = 0;
                break;

        case 1:         /* Command will not be handled */
                rc = -EAGAIN;
                break;
        }

        iwl_legacy_free_pages(priv, cmd.reply_page);

        return rc;
}

static void iwl3945_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_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;
                iwl3945_disable_events(priv);
        }

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

static void iwl3945_rx_reply_add_sta(struct iwl_priv *priv,
                                 struct iwl_rx_mem_buffer *rxb)
{
#ifdef CONFIG_IWLWIFI_LEGACY_DEBUG
        struct iwl_rx_packet *pkt = rxb_addr(rxb);
#endif

        IWL_DEBUG_RX(priv, "Received REPLY_ADD_STA: 0x%02X\n", pkt->u.status);
}

static void iwl3945_rx_beacon_notif(struct iwl_priv *priv,
                                struct iwl_rx_mem_buffer *rxb)
{
        struct iwl_rx_packet *pkt = rxb_addr(rxb);
        struct iwl3945_beacon_notif *beacon = &(pkt->u.beacon_status);
#ifdef CONFIG_IWLWIFI_LEGACY_DEBUG
        u8 rate = beacon->beacon_notify_hdr.rate;

        IWL_DEBUG_RX(priv, "beacon status %x retries %d iss %d "
                "tsf %d %d rate %d\n",
                le32_to_cpu(beacon->beacon_notify_hdr.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);

}

/* Handle notification from uCode that card's power state is changing
 * due to software, hardware, or critical temperature RFKILL */
static void iwl3945_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_WARN(priv, "Card state received: HW:%s SW:%s\n",
                          (flags & HW_CARD_DISABLED) ? "Kill" : "On",
                          (flags & SW_CARD_DISABLED) ? "Kill" : "On");

        iwl_write32(priv, CSR_UCODE_DRV_GP1_SET,
                    CSR_UCODE_DRV_GP1_BIT_CMD_BLOCKED);

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


        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);
}

/**
 * iwl3945_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 iwl3945_setup_rx_handlers(struct iwl_priv *priv)
{
        priv->rx_handlers[REPLY_ALIVE] = iwl3945_rx_reply_alive;
        priv->rx_handlers[REPLY_ADD_STA] = iwl3945_rx_reply_add_sta;
        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] = iwl3945_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] = iwl3945_reply_statistics;
        priv->rx_handlers[STATISTICS_NOTIFICATION] = iwl3945_hw_rx_statistics;

        iwl_legacy_setup_rx_scan_handlers(priv);
        priv->rx_handlers[CARD_STATE_NOTIFICATION] = iwl3945_rx_card_state_notif;

        /* Set up hardware specific Rx handlers */
        iwl3945_hw_rx_handler_setup(priv);
}

/************************** RX-FUNCTIONS ****************************/
/*
 * Rx theory of operation
 *
 * The host allocates 32 DMA target addresses and passes the host address
 * to the firmware at register IWL_RFDS_TABLE_LOWER + N * RFD_SIZE where N is
 * 0 to 31
 *
 * Rx Queue Indexes
 * The host/firmware share two index registers for managing the Rx buffers.
 *
 * The READ index maps to the first position that the firmware may be writing
 * to -- the driver can read up to (but not including) this position and get
 * good data.
 * The READ index is managed by the firmware once the card is enabled.
 *
 * The WRITE index maps to the last position the driver has read from -- the
 * position preceding WRITE is the last slot the firmware can place a packet.
 *
 * The queue is empty (no good data) if WRITE = READ - 1, and is full if
 * WRITE = READ.
 *
 * During initialization, the host sets up the READ queue position to the first
 * INDEX position, and WRITE to the last (READ - 1 wrapped)
 *
 * When the firmware places a packet in a buffer, it will advance the READ index
 * and fire the RX interrupt.  The driver can then query the READ index and
 * process as many packets as possible, moving the WRITE index forward as it
 * resets the Rx queue buffers with new memory.
 *
 * The management in the driver is as follows:
 * + A list of pre-allocated SKBs is stored in iwl->rxq->rx_free.  When
 *   iwl->rxq->free_count drops to or below RX_LOW_WATERMARK, work is scheduled
 *   to replenish the iwl->rxq->rx_free.
 * + In iwl3945_rx_replenish (scheduled) if 'processed' != 'read' then the
 *   iwl->rxq is replenished and the READ INDEX is updated (updating the
 *   'processed' and 'read' driver indexes as well)
 * + A received packet is processed and handed to the kernel network stack,
 *   detached from the iwl->rxq.  The driver 'processed' index is updated.
 * + The Host/Firmware iwl->rxq is replenished at tasklet time from the rx_free
 *   list. If there are no allocated buffers in iwl->rxq->rx_free, the READ
 *   INDEX is not incremented and iwl->status(RX_STALLED) is set.  If there
 *   were enough free buffers and RX_STALLED is set it is cleared.
 *
 *
 * Driver sequence:
 *
 * iwl3945_rx_replenish()     Replenishes rx_free list from rx_used, and calls
 *                            iwl3945_rx_queue_restock
 * iwl3945_rx_queue_restock() Moves available buffers from rx_free into Rx
 *                            queue, updates firmware pointers, and updates
 *                            the WRITE index.  If insufficient rx_free buffers
 *                            are available, schedules iwl3945_rx_replenish
 *
 * -- enable interrupts --
 * ISR - iwl3945_rx()         Detach iwl_rx_mem_buffers from pool up to the
 *                            READ INDEX, detaching the SKB from the pool.
 *                            Moves the packet buffer from queue to rx_used.
 *                            Calls iwl3945_rx_queue_restock to refill any empty
 *                            slots.
 * ...
 *
 */

/**
 * iwl3945_dma_addr2rbd_ptr - convert a DMA address to a uCode read buffer ptr
 */
static inline __le32 iwl3945_dma_addr2rbd_ptr(struct iwl_priv *priv,
                                          dma_addr_t dma_addr)
{
        return cpu_to_le32((u32)dma_addr);
}

/**
 * iwl3945_rx_queue_restock - refill RX queue from pre-allocated pool
 *
 * If there are slots in the RX queue that need to be restocked,
 * and we have free pre-allocated buffers, fill the ranks as much
 * as we can, pulling from rx_free.
 *
 * This moves the 'write' index forward to catch up with 'processed', and
 * also updates the memory address in the firmware to reference the new
 * target buffer.
 */
static void iwl3945_rx_queue_restock(struct iwl_priv *priv)
{
        struct iwl_rx_queue *rxq = &priv->rxq;
        struct list_head *element;
        struct iwl_rx_mem_buffer *rxb;
        unsigned long flags;
        int write;

        spin_lock_irqsave(&rxq->lock, flags);
        write = rxq->write & ~0x7;
        while ((iwl_legacy_rx_queue_space(rxq) > 0) && (rxq->free_count)) {
                /* Get next free Rx buffer, remove from free list */
                element = rxq->rx_free.next;
                rxb = list_entry(element, struct iwl_rx_mem_buffer, list);
                list_del(element);

                /* Point to Rx buffer via next RBD in circular buffer */
                rxq->bd[rxq->write] = iwl3945_dma_addr2rbd_ptr(priv, rxb->page_dma);
                rxq->queue[rxq->write] = rxb;
                rxq->write = (rxq->write + 1) & RX_QUEUE_MASK;
                rxq->free_count--;
        }
        spin_unlock_irqrestore(&rxq->lock, flags);
        /* If the pre-allocated buffer pool is dropping low, schedule to
         * refill it */
        if (rxq->free_count <= RX_LOW_WATERMARK)
                queue_work(priv->workqueue, &priv->rx_replenish);


        /* If we've added more space for the firmware to place data, tell it.
         * Increment device's write pointer in multiples of 8. */
        if ((rxq->write_actual != (rxq->write & ~0x7))
            || (abs(rxq->write - rxq->read) > 7)) {
                spin_lock_irqsave(&rxq->lock, flags);

                rxq->need_update = 1;
                spin_unlock_irqrestore(&rxq->lock, flags);
                iwl_legacy_rx_queue_update_write_ptr(priv, rxq);
        }
}

/**
 * iwl3945_rx_replenish - Move all used packet from rx_used to rx_free
 *
 * When moving to rx_free an SKB is allocated for the slot.
 *
 * Also restock the Rx queue via iwl3945_rx_queue_restock.
 * This is called as a scheduled work item (except for during initialization)
 */
static void iwl3945_rx_allocate(struct iwl_priv *priv, gfp_t priority)
{
        struct iwl_rx_queue *rxq = &priv->rxq;
        struct list_head *element;
        struct iwl_rx_mem_buffer *rxb;
        struct page *page;
        unsigned long flags;
        gfp_t gfp_mask = priority;

        while (1) {
                spin_lock_irqsave(&rxq->lock, flags);

                if (list_empty(&rxq->rx_used)) {
                        spin_unlock_irqrestore(&rxq->lock, flags);
                        return;
                }
                spin_unlock_irqrestore(&rxq->lock, flags);

                if (rxq->free_count > RX_LOW_WATERMARK)
                        gfp_mask |= __GFP_NOWARN;

                if (priv->hw_params.rx_page_order > 0)
                        gfp_mask |= __GFP_COMP;

                /* Alloc a new receive buffer */
                page = alloc_pages(gfp_mask, priv->hw_params.rx_page_order);
                if (!page) {
                        if (net_ratelimit())
                                IWL_DEBUG_INFO(priv, "Failed to allocate SKB buffer.\n");
                        if ((rxq->free_count <= RX_LOW_WATERMARK) &&
                            net_ratelimit())
                                IWL_CRIT(priv, "Failed to allocate SKB buffer with %s. Only %u free buffers remaining.\n",
                                         priority == GFP_ATOMIC ?  "GFP_ATOMIC" : "GFP_KERNEL",
                                         rxq->free_count);
                        /* We don't reschedule replenish work here -- we will
                         * call the restock method and if it still needs
                         * more buffers it will schedule replenish */
                        break;
                }

                spin_lock_irqsave(&rxq->lock, flags);
                if (list_empty(&rxq->rx_used)) {
                        spin_unlock_irqrestore(&rxq->lock, flags);
                        __free_pages(page, priv->hw_params.rx_page_order);
                        return;
                }
                element = rxq->rx_used.next;
                rxb = list_entry(element, struct iwl_rx_mem_buffer, list);
                list_del(element);
                spin_unlock_irqrestore(&rxq->lock, flags);

                rxb->page = page;
                /* Get physical address of RB/SKB */
                rxb->page_dma = pci_map_page(priv->pci_dev, page, 0,
                                PAGE_SIZE << priv->hw_params.rx_page_order,
                                PCI_DMA_FROMDEVICE);

                spin_lock_irqsave(&rxq->lock, flags);

                list_add_tail(&rxb->list, &rxq->rx_free);
                rxq->free_count++;
                priv->alloc_rxb_page++;

                spin_unlock_irqrestore(&rxq->lock, flags);
        }
}

void iwl3945_rx_queue_reset(struct iwl_priv *priv, struct iwl_rx_queue *rxq)
{
        unsigned long flags;
        int i;
        spin_lock_irqsave(&rxq->lock, flags);
        INIT_LIST_HEAD(&rxq->rx_free);
        INIT_LIST_HEAD(&rxq->rx_used);
        /* Fill the rx_used queue with _all_ of the Rx buffers */
        for (i = 0; i < RX_FREE_BUFFERS + RX_QUEUE_SIZE; i++) {
                /* In the reset function, these buffers may have been allocated
                 * to an SKB, so we need to unmap and free potential storage */
                if (rxq->pool[i].page != NULL) {
                        pci_unmap_page(priv->pci_dev, rxq->pool[i].page_dma,
                                PAGE_SIZE << priv->hw_params.rx_page_order,
                                PCI_DMA_FROMDEVICE);
                        __iwl_legacy_free_pages(priv, rxq->pool[i].page);
                        rxq->pool[i].page = NULL;
                }
                list_add_tail(&rxq->pool[i].list, &rxq->rx_used);
        }

        /* Set us so that we have processed and used all buffers, but have
         * not restocked the Rx queue with fresh buffers */
        rxq->read = rxq->write = 0;
        rxq->write_actual = 0;
        rxq->free_count = 0;
        spin_unlock_irqrestore(&rxq->lock, flags);
}

void iwl3945_rx_replenish(void *data)
{
        struct iwl_priv *priv = data;
        unsigned long flags;

        iwl3945_rx_allocate(priv, GFP_KERNEL);

        spin_lock_irqsave(&priv->lock, flags);
        iwl3945_rx_queue_restock(priv);
        spin_unlock_irqrestore(&priv->lock, flags);
}

static void iwl3945_rx_replenish_now(struct iwl_priv *priv)
{
        iwl3945_rx_allocate(priv, GFP_ATOMIC);

        iwl3945_rx_queue_restock(priv);
}


/* Assumes that the skb field of the buffers in 'pool' is kept accurate.
 * If an SKB has been detached, the POOL needs to have its SKB set to NULL
 * This free routine walks the list of POOL entries and if SKB is set to
 * non NULL it is unmapped and freed
 */
static void iwl3945_rx_queue_free(struct iwl_priv *priv, struct iwl_rx_queue *rxq)
{
        int i;
        for (i = 0; i < RX_QUEUE_SIZE + RX_FREE_BUFFERS; i++) {
                if (rxq->pool[i].page != NULL) {
                        pci_unmap_page(priv->pci_dev, rxq->pool[i].page_dma,
                                PAGE_SIZE << priv->hw_params.rx_page_order,
                                PCI_DMA_FROMDEVICE);
                        __iwl_legacy_free_pages(priv, rxq->pool[i].page);
                        rxq->pool[i].page = NULL;
                }
        }

        dma_free_coherent(&priv->pci_dev->dev, 4 * RX_QUEUE_SIZE, rxq->bd,
                          rxq->bd_dma);
        dma_free_coherent(&priv->pci_dev->dev, sizeof(struct iwl_rb_status),
                          rxq->rb_stts, rxq->rb_stts_dma);
        rxq->bd = NULL;
        rxq->rb_stts  = NULL;
}


/* Convert linear signal-to-noise ratio into dB */
static u8 ratio2dB[100] = {
/*       0   1   2   3   4   5   6   7   8   9 */
         0,  0,  6, 10, 12, 14, 16, 17, 18, 19, /* 00 - 09 */
        20, 21, 22, 22, 23, 23, 24, 25, 26, 26, /* 10 - 19 */
        26, 26, 26, 27, 27, 28, 28, 28, 29, 29, /* 20 - 29 */
        29, 30, 30, 30, 31, 31, 31, 31, 32, 32, /* 30 - 39 */
        32, 32, 32, 33, 33, 33, 33, 33, 34, 34, /* 40 - 49 */
        34, 34, 34, 34, 35, 35, 35, 35, 35, 35, /* 50 - 59 */
        36, 36, 36, 36, 36, 36, 36, 37, 37, 37, /* 60 - 69 */
        37, 37, 37, 37, 37, 38, 38, 38, 38, 38, /* 70 - 79 */
        38, 38, 38, 38, 38, 39, 39, 39, 39, 39, /* 80 - 89 */
        39, 39, 39, 39, 39, 40, 40, 40, 40, 40  /* 90 - 99 */
};

/* Calculates a relative dB value from a ratio of linear
 *   (i.e. not dB) signal levels.
 * Conversion assumes that levels are voltages (20*log), not powers (10*log). */
int iwl3945_calc_db_from_ratio(int sig_ratio)
{
        /* 1000:1 or higher just report as 60 dB */
        if (sig_ratio >= 1000)
                return 60;

        /* 100:1 or higher, divide by 10 and use table,
         *   add 20 dB to make up for divide by 10 */
        if (sig_ratio >= 100)
                return 20 + (int)ratio2dB[sig_ratio/10];

        /* We shouldn't see this */
        if (sig_ratio < 1)
                return 0;

        /* Use table for ratios 1:1 - 99:1 */
        return (int)ratio2dB[sig_ratio];
}

/**
 * iwl3945_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.
 */
static void iwl3945_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 = 0;

        /* 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;

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

        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 != 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 iwl3945_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 won't assert. */
                if (fill_rx) {
                        count++;
                        if (count >= 8) {
                                rxq->read = i;
                                iwl3945_rx_replenish_now(priv);
                                count = 0;
                        }
                }
        }

        /* Backtrack one entry */
        rxq->read = i;
        if (fill_rx)
                iwl3945_rx_replenish_now(priv);
        else
                iwl3945_rx_queue_restock(priv);
}

/* call this function to flush any scheduled tasklet */
static inline void iwl3945_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 const char *iwl3945_desc_lookup(int i)
{
        switch (i) {
        case 1:
                return "FAIL";
        case 2:
                return "BAD_PARAM";
        case 3:
                return "BAD_CHECKSUM";
        case 4:
                return "NMI_INTERRUPT";
        case 5:
                return "SYSASSERT";
        case 6:
                return "FATAL_ERROR";
        }

        return "UNKNOWN";
}

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

void iwl3945_dump_nic_error_log(struct iwl_priv *priv)
{
        u32 i;
        u32 desc, time, count, base, data1;
        u32 blink1, blink2, ilink1, ilink2;

        base = le32_to_cpu(priv->card_alive.error_event_table_ptr);

        if (!iwl3945_hw_valid_rtc_data_addr(base)) {
                IWL_ERR(priv, "Not valid error log pointer 0x%08X\n", base);
                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);
        }

        IWL_ERR(priv, "Desc       Time       asrtPC  blink2 "
                  "ilink1  nmiPC   Line\n");
        for (i = ERROR_START_OFFSET;
             i < (count * ERROR_ELEM_SIZE) + ERROR_START_OFFSET;
             i += ERROR_ELEM_SIZE) {
                desc = iwl_legacy_read_targ_mem(priv, base + i);
                time =
                    iwl_legacy_read_targ_mem(priv, base + i + 1 * sizeof(u32));
                blink1 =
                    iwl_legacy_read_targ_mem(priv, base + i + 2 * sizeof(u32));
                blink2 =
                    iwl_legacy_read_targ_mem(priv, base + i + 3 * sizeof(u32));
                ilink1 =
                    iwl_legacy_read_targ_mem(priv, base + i + 4 * sizeof(u32));
                ilink2 =
                    iwl_legacy_read_targ_mem(priv, base + i + 5 * sizeof(u32));
                data1 =
                    iwl_legacy_read_targ_mem(priv, base + i + 6 * sizeof(u32));

                IWL_ERR(priv,
                        "%-13s (0x%X) %010u 0x%05X 0x%05X 0x%05X 0x%05X %u\n\n",
                        iwl3945_desc_lookup(desc), desc, time, blink1, blink2,
                        ilink1, ilink2, data1);
                trace_iwlwifi_legacy_dev_ucode_error(priv, desc, time, data1, 0,
                                        0, blink1, blink2, ilink1, ilink2);
        }
}

static void iwl3945_irq_tasklet(struct iwl_priv *priv)
{
        u32 inta, handled = 0;
        u32 inta_fh;
        unsigned long flags;
#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 & CSR39_FH_INT_RX_MASK)
                inta |= CSR_INT_BIT_FH_RX;
        if (inta_fh & CSR39_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);

        /* 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 */
        if (inta & CSR_INT_BIT_WAKEUP) {
                IWL_DEBUG_ISR(priv, "Wakeup interrupt\n");
                iwl_legacy_rx_queue_update_write_ptr(priv, &priv->rxq);
                iwl_legacy_txq_update_write_ptr(priv, &priv->txq[0]);
                iwl_legacy_txq_update_write_ptr(priv, &priv->txq[1]);
                iwl_legacy_txq_update_write_ptr(priv, &priv->txq[2]);
                iwl_legacy_txq_update_write_ptr(priv, &priv->txq[3]);
                iwl_legacy_txq_update_write_ptr(priv, &priv->txq[4]);
                iwl_legacy_txq_update_write_ptr(priv, &priv->txq[5]);

                priv->isr_stats.wakeup++;
                handled |= CSR_INT_BIT_WAKEUP;
        }

        /* All uCode command responses, including Tx command responses,
         * Rx "responses" (frame-received notification), and other
         * notifications from uCode come through here*/
        if (inta & (CSR_INT_BIT_FH_RX | CSR_INT_BIT_SW_RX)) {
                iwl3945_rx_handle(priv);
                priv->isr_stats.rx++;
                handled |= (CSR_INT_BIT_FH_RX | CSR_INT_BIT_SW_RX);
        }

        if (inta & CSR_INT_BIT_FH_TX) {
                IWL_DEBUG_ISR(priv, "Tx interrupt\n");
                priv->isr_stats.tx++;

                iwl_write32(priv, CSR_FH_INT_STATUS, (1 << 6));
                iwl_legacy_write_direct32(priv, FH39_TCSR_CREDIT
                                        (FH39_SRVC_CHNL), 0x0);
                handled |= CSR_INT_BIT_FH_TX;
        }

        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);

#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
}

static int iwl3945_get_channels_for_scan(struct iwl_priv *priv,
                                         enum ieee80211_band band,
                                     u8 is_active, u8 n_probes,
                                     struct iwl3945_scan_channel *scan_ch,
                                     struct ieee80211_vif *vif)
{
        struct ieee80211_channel *chan;
        const struct ieee80211_supported_band *sband;
        const struct iwl_channel_info *ch_info;
        u16 passive_dwell = 0;
        u16 active_dwell = 0;
        int added, i;

        sband = iwl_get_hw_mode(priv, band);
        if (!sband)
                return 0;

        active_dwell = iwl_legacy_get_active_dwell_time(priv, band, n_probes);
        passive_dwell = iwl_legacy_get_passive_dwell_time(priv, band, vif);

        if (passive_dwell <= active_dwell)
                passive_dwell = active_dwell + 1;

        for (i = 0, added = 0; i < priv->scan_request->n_channels; i++) {
                chan = priv->scan_request->channels[i];

                if (chan->band != band)
                        continue;

                scan_ch->channel = chan->hw_value;

                ch_info = iwl_legacy_get_channel_info(priv, band,
                                                        scan_ch->channel);
                if (!iwl_legacy_is_channel_valid(ch_info)) {
                        IWL_DEBUG_SCAN(priv,
                                "Channel %d is INVALID for this band.\n",
                               scan_ch->channel);
                        continue;
                }

                scan_ch->active_dwell = cpu_to_le16(active_dwell);
                scan_ch->passive_dwell = cpu_to_le16(passive_dwell);
                /* If passive , set up for auto-switch
                 *  and use long active_dwell time.
                 */
                if (!is_active || iwl_legacy_is_channel_passive(ch_info) ||
                    (chan->flags & IEEE80211_CHAN_PASSIVE_SCAN)) {
                        scan_ch->type = 0;      /* passive */
                        if (IWL_UCODE_API(priv->ucode_ver) == 1)
                                scan_ch->active_dwell = cpu_to_le16(passive_dwell - 1);
                } else {
                        scan_ch->type = 1;      /* active */
                }

                /* Set direct probe bits. These may be used both for active
                 * scan channels (probes gets sent right away),
                 * or for passive channels (probes get se sent only after
                 * hearing clear Rx packet).*/
                if (IWL_UCODE_API(priv->ucode_ver) >= 2) {
                        if (n_probes)
                                scan_ch->type |= IWL39_SCAN_PROBE_MASK(n_probes);
                } else {
                        /* uCode v1 does not allow setting direct probe bits on
                         * passive channel. */
                        if ((scan_ch->type & 1) && n_probes)
                                scan_ch->type |= IWL39_SCAN_PROBE_MASK(n_probes);
                }

                /* Set txpower levels to defaults */
                scan_ch->tpc.dsp_atten = 110;
                /* scan_pwr_info->tpc.dsp_atten; */

                /*scan_pwr_info->tpc.tx_gain; */
                if (band == IEEE80211_BAND_5GHZ)
                        scan_ch->tpc.tx_gain = ((1 << 5) | (3 << 3)) | 3;
                else {
                        scan_ch->tpc.tx_gain = ((1 << 5) | (5 << 3));
                        /* NOTE: if we were doing 6Mb OFDM for scans we'd use
                         * power level:
                         * scan_ch->tpc.tx_gain = ((1 << 5) | (2 << 3)) | 3;
                         */
                }

                IWL_DEBUG_SCAN(priv, "Scanning %d [%s %d]\n",
                               scan_ch->channel,
                               (scan_ch->type & 1) ? "ACTIVE" : "PASSIVE",
                               (scan_ch->type & 1) ?
                               active_dwell : passive_dwell);

                scan_ch++;
                added++;
        }

        IWL_DEBUG_SCAN(priv, "total channels to scan %d\n", added);
        return added;
}

static void iwl3945_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 = iwl3945_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 > IWL39_LAST_OFDM_RATE) || (i < IWL_FIRST_OFDM_RATE)) {
                        /*
                         * If CCK != 1M then set short preamble rate flag.
                         */
                        rates[i].flags |= (iwl3945_rates[i].plcp == 10) ?
                                0 : IEEE80211_RATE_SHORT_PREAMBLE;
                }
        }
}

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

static void iwl3945_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);
}

/**
 * iwl3945_verify_inst_full - verify runtime uCode image in card vs. host,
 *     looking at all data.
 */
static int iwl3945_verify_inst_full(struct iwl_priv *priv, __le32 *image, u32 len)
{
        u32 val;
        u32 save_len = len;
        int rc = 0;
        u32 errcnt;

        IWL_DEBUG_INFO(priv, "ucode inst image size is %u\n", len);

        iwl_legacy_write_direct32(priv, HBUS_TARG_MEM_RADDR,
                               IWL39_RTC_INST_LOWER_BOUND);

        errcnt = 0;
        for (; len > 0; len -= sizeof(u32), image++) {
                /* read data comes through single port, auto-incr addr */
                /* NOTE: Use the debugless read so we don't flood kernel log
                 * if IWL_DL_IO is set */
                val = _iwl_legacy_read_direct32(priv, HBUS_TARG_MEM_RDAT);
                if (val != le32_to_cpu(*image)) {
                        IWL_ERR(priv, "uCode INST section is invalid at "
                                  "offset 0x%x, is 0x%x, s/b 0x%x\n",
                                  save_len - len, val, le32_to_cpu(*image));
                        rc = -EIO;
                        errcnt++;
                        if (errcnt >= 20)
                                break;
                }
        }


        if (!errcnt)
                IWL_DEBUG_INFO(priv,
                        "ucode image in INSTRUCTION memory is good\n");

        return rc;
}


/**
 * iwl3945_verify_inst_sparse - verify runtime uCode image in card vs. host,
 *   using sample data 100 bytes apart.  If these sample points are good,
 *   it's a pretty good bet that everything between them is good, too.
 */
static int iwl3945_verify_inst_sparse(struct iwl_priv *priv, __le32 *image, u32 len)
{
        u32 val;
        int rc = 0;
        u32 errcnt = 0;
        u32 i;

        IWL_DEBUG_INFO(priv, "ucode inst image size is %u\n", len);

        for (i = 0; i < len; i += 100, image += 100/sizeof(u32)) {
                /* read data comes through single port, auto-incr addr */
                /* NOTE: Use the debugless read so we don't flood kernel log
                 * if IWL_DL_IO is set */
                iwl_legacy_write_direct32(priv, HBUS_TARG_MEM_RADDR,
                        i + IWL39_RTC_INST_LOWER_BOUND);
                val = _iwl_legacy_read_direct32(priv, HBUS_TARG_MEM_RDAT);
                if (val != le32_to_cpu(*image)) {
#if 0 /* Enable this if you want to see details */
                        IWL_ERR(priv, "uCode INST section is invalid at "
                                  "offset 0x%x, is 0x%x, s/b 0x%x\n",
                                  i, val, *image);
#endif
                        rc = -EIO;
                        errcnt++;
                        if (errcnt >= 3)
                                break;
                }
        }

        return rc;
}


/**
 * iwl3945_verify_ucode - determine which instruction image is in SRAM,
 *    and verify its contents
 */
static int iwl3945_verify_ucode(struct iwl_priv *priv)
{
        __le32 *image;
        u32 len;
        int rc = 0;

        /* Try bootstrap */
        image = (__le32 *)priv->ucode_boot.v_addr;
        len = priv->ucode_boot.len;
        rc = iwl3945_verify_inst_sparse(priv, image, len);
        if (rc == 0) {
                IWL_DEBUG_INFO(priv, "Bootstrap uCode is good in inst SRAM\n");
                return 0;
        }

        /* Try initialize */
        image = (__le32 *)priv->ucode_init.v_addr;
        len = priv->ucode_init.len;
        rc = iwl3945_verify_inst_sparse(priv, image, len);
        if (rc == 0) {
                IWL_DEBUG_INFO(priv, "Initialize uCode is good in inst SRAM\n");
                return 0;
        }

        /* Try runtime/protocol */
        image = (__le32 *)priv->ucode_code.v_addr;
        len = priv->ucode_code.len;
        rc = iwl3945_verify_inst_sparse(priv, image, len);
        if (rc == 0) {
                IWL_DEBUG_INFO(priv, "Runtime uCode is good in inst SRAM\n");
                return 0;
        }

        IWL_ERR(priv, "NO VALID UCODE IMAGE IN INSTRUCTION SRAM!!\n");

        /* Since nothing seems to match, show first several data entries in
         * instruction SRAM, so maybe visual inspection will give a clue.
         * Selection of bootstrap image (vs. other images) is arbitrary. */
        image = (__le32 *)priv->ucode_boot.v_addr;
        len = priv->ucode_boot.len;
        rc = iwl3945_verify_inst_full(priv, image, len);

        return rc;
}

static void iwl3945_nic_start(struct iwl_priv *priv)
{
        /* Remove all resets to allow NIC to operate */
        iwl_write32(priv, CSR_RESET, 0);
}

#define IWL3945_UCODE_GET(item)                                         \
static u32 iwl3945_ucode_get_##item(const struct iwl_ucode_header *ucode)\
{                                                                       \
        return le32_to_cpu(ucode->v1.item);                             \
}

static u32 iwl3945_ucode_get_header_size(u32 api_ver)
{
        return 24;
}

static u8 *iwl3945_ucode_get_data(const struct iwl_ucode_header *ucode)
{
        return (u8 *) ucode->v1.data;
}

IWL3945_UCODE_GET(inst_size);
IWL3945_UCODE_GET(data_size);
IWL3945_UCODE_GET(init_size);
IWL3945_UCODE_GET(init_data_size);
IWL3945_UCODE_GET(boot_size);

/**
 * iwl3945_read_ucode - Read uCode images from disk file.
 *
 * Copy into buffers for card to fetch via bus-mastering
 */
static int iwl3945_read_ucode(struct iwl_priv *priv)
{
        const struct iwl_ucode_header *ucode;
        int ret = -EINVAL, index;
        const struct firmware *ucode_raw;
        /* firmware file name contains uCode/driver compatibility version */
        const char *name_pre = priv->cfg->fw_name_pre;
        const unsigned int api_max = priv->cfg->ucode_api_max;
        const unsigned int api_min = priv->cfg->ucode_api_min;
        char buf[25];
        u8 *src;
        size_t len;
        u32 api_ver, inst_size, data_size, init_size, init_data_size, boot_size;

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

        if (ret < 0)
                goto error;

        /* Make sure that we got at least our header! */
        if (ucode_raw->size <  iwl3945_ucode_get_header_size(1)) {
                IWL_ERR(priv, "File size way too small!\n");
                ret = -EINVAL;
                goto err_release;
        }

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

        priv->ucode_ver = le32_to_cpu(ucode->ver);
        api_ver = IWL_UCODE_API(priv->ucode_ver);
        inst_size = iwl3945_ucode_get_inst_size(ucode);
        data_size = iwl3945_ucode_get_data_size(ucode);
        init_size = iwl3945_ucode_get_init_size(ucode);
        init_data_size = iwl3945_ucode_get_init_data_size(ucode);
        boot_size = iwl3945_ucode_get_boot_size(ucode);
        src = iwl3945_ucode_get_data(ucode);

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

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

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


        /* Verify size of file vs. image size info in file's header */
        if (ucode_raw->size != iwl3945_ucode_get_header_size(api_ver) +
                inst_size + data_size + init_size +
                init_data_size + boot_size) {

                IWL_DEBUG_INFO(priv,
                        "uCode file size %zd does not match expected size\n",
                        ucode_raw->size);
                ret = -EINVAL;
                goto err_release;
        }

        /* Verify that uCode images will fit in card's SRAM */
        if (inst_size > IWL39_MAX_INST_SIZE) {
                IWL_DEBUG_INFO(priv, "uCode instr len %d too large to fit in\n",
                               inst_size);
                ret = -EINVAL;
                goto err_release;
        }

        if (data_size > IWL39_MAX_DATA_SIZE) {
                IWL_DEBUG_INFO(priv, "uCode data len %d too large to fit in\n",
                               data_size);
                ret = -EINVAL;
                goto err_release;
        }
        if (init_size > IWL39_MAX_INST_SIZE) {
                IWL_DEBUG_INFO(priv,
                                "uCode init instr len %d too large to fit in\n",
                                init_size);
                ret = -EINVAL;
                goto err_release;
        }
        if (init_data_size > IWL39_MAX_DATA_SIZE) {
                IWL_DEBUG_INFO(priv,
                                "uCode init data len %d too large to fit in\n",
                                init_data_size);
                ret = -EINVAL;
                goto err_release;
        }
        if (boot_size > IWL39_MAX_BSM_SIZE) {

                IWL_DEBUG_INFO(priv,
                                "uCode boot instr len %d too large to fit in\n",
                                boot_size);
                ret = -EINVAL;
                goto err_release;
        }

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

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

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

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

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

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

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

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

        IWL_DEBUG_INFO(priv, "uCode instr buf vaddr = 0x%p, paddr = 0x%08x\n",
                priv->ucode_code.v_addr, (u32)priv->ucode_code.p_addr);

        /* Runtime data (2nd block)
         * NOTE:  Copy into backup buffer will be done in iwl3945_up()  */
        len = data_size;
        IWL_DEBUG_INFO(priv,
                "Copying (but not loading) uCode data len %zd\n", len);
        memcpy(priv->ucode_data.v_addr, src, len);
        memcpy(priv->ucode_data_backup.v_addr, src, len);
        src += len;

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

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

        /* Bootstrap instructions (5th block) */
        len = boot_size;
        IWL_DEBUG_INFO(priv,
                "Copying (but not loading) boot instr len %zd\n", len);
        memcpy(priv->ucode_boot.v_addr, src, len);

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

 err_pci_alloc:
        IWL_ERR(priv, "failed to allocate pci memory\n");
        ret = -ENOMEM;
        iwl3945_dealloc_ucode_pci(priv);

 err_release:
        release_firmware(ucode_raw);

 error:
        return ret;
}


/**
 * iwl3945_set_ucode_ptrs - Set uCode address location
 *
 * Tell initialization uCode where to find runtime uCode.
 *
 * BSM registers initially contain pointers to initialization uCode.
 * We need to replace them to load runtime uCode inst and data,
 * and to save runtime data when powering down.
 */
static int iwl3945_set_ucode_ptrs(struct iwl_priv *priv)
{
        dma_addr_t pinst;
        dma_addr_t pdata;

        /* bits 31:0 for 3945 */
        pinst = priv->ucode_code.p_addr;
        pdata = priv->ucode_data_backup.p_addr;

        /* Tell bootstrap uCode where to find image to load */
        iwl_legacy_write_prph(priv, BSM_DRAM_INST_PTR_REG, pinst);
        iwl_legacy_write_prph(priv, BSM_DRAM_DATA_PTR_REG, pdata);
        iwl_legacy_write_prph(priv, BSM_DRAM_DATA_BYTECOUNT_REG,
                                 priv->ucode_data.len);

        /* Inst byte count must be last to set up, bit 31 signals uCode
         *   that all new ptr/size info is in place */
        iwl_legacy_write_prph(priv, BSM_DRAM_INST_BYTECOUNT_REG,
                                 priv->ucode_code.len | BSM_DRAM_INST_LOAD);

        IWL_DEBUG_INFO(priv, "Runtime uCode pointers are set.\n");

        return 0;
}

/**
 * iwl3945_init_alive_start - Called after REPLY_ALIVE notification received
 *
 * Called after REPLY_ALIVE notification received from "initialize" uCode.
 *
 * Tell "initialize" uCode to go ahead and load the runtime uCode.
 */
static void iwl3945_init_alive_start(struct iwl_priv *priv)
{
        /* Check alive response for "valid" sign from uCode */
        if (priv->card_alive_init.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, "Initialize Alive failed.\n");
                goto restart;
        }

        /* Bootstrap uCode has loaded initialize uCode ... verify inst image.
         * This is a paranoid check, because we would not have gotten the
         * "initialize" alive if code weren't properly loaded.  */
        if (iwl3945_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 \"initialize\" uCode load.\n");
                goto restart;
        }

        /* Send pointers to protocol/runtime uCode image ... init code will
         * load and launch runtime uCode, which will send us another "Alive"
         * notification. */
        IWL_DEBUG_INFO(priv, "Initialization Alive received.\n");
        if (iwl3945_set_ucode_ptrs(priv)) {
                /* Runtime instruction load won't happen;
                 * take it all the way back down so we can try again */
                IWL_DEBUG_INFO(priv, "Couldn't set up uCode pointers.\n");
                goto restart;
        }
        return;

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

/**
 * iwl3945_alive_start - called after REPLY_ALIVE notification received
 *                   from protocol/runtime uCode (initialization uCode's
 *                   Alive gets handled by iwl3945_init_alive_start()).
 */
static void iwl3945_alive_start(struct iwl_priv *priv)
{
        int thermal_spin = 0;
        u32 rfkill;
        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 (iwl3945_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;
        }

        rfkill = iwl_legacy_read_prph(priv, APMG_RFKILL_REG);
        IWL_DEBUG_INFO(priv, "RFKILL status: 0x%x\n", rfkill);

        if (rfkill & 0x1) {
                clear_bit(STATUS_RF_KILL_HW, &priv->status);
                /* if RFKILL is not on, then wait for thermal
                 * sensor in adapter to kick in */
                while (iwl3945_hw_get_temperature(priv) == 0) {
                        thermal_spin++;
                        udelay(10);
                }

                if (thermal_spin)
                        IWL_DEBUG_INFO(priv, "Thermal calibration took %dus\n",
                                       thermal_spin * 10);
        } else
                set_bit(STATUS_RF_KILL_HW, &priv->status);

        /* After the ALIVE response, we can send commands to 3945 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_3945;

        iwl_legacy_power_update_mode(priv, true);

        if (iwl_legacy_is_associated(priv, IWL_RXON_CTX_BSS)) {
                struct iwl3945_rxon_cmd *active_rxon =
                                (struct iwl3945_rxon_cmd *)(&ctx->active);

                ctx->staging.filter_flags |= RXON_FILTER_ASSOC_MSK;
                active_rxon->filter_flags &= ~RXON_FILTER_ASSOC_MSK;
        } else {
                /* Initialize our rx_config data */
                iwl_legacy_connection_init_rx_config(priv, ctx);
        }

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

        set_bit(STATUS_READY, &priv->status);

        /* Configure the adapter for unassociated operation */
        iwl3945_commit_rxon(priv, ctx);

        iwl3945_reg_txpower_periodic(priv);

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

        return;

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

static void iwl3945_cancel_deferred_work(struct iwl_priv *priv);

static void __iwl3945_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);

        /* Station information will now be cleared in device */
        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);
        iwl3945_synchronize_irq(priv);

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

        /* If we have not previously called iwl3945_init() then
         * clear all bits but the RF Kill bits 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;

        iwl3945_hw_txq_ctx_stop(priv);
        iwl3945_hw_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);

        /* 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));

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

        /* clear out any free frames */
        iwl3945_clear_free_frames(priv);
}

static void iwl3945_down(struct iwl_priv *priv)
{
        mutex_lock(&priv->mutex);
        __iwl3945_down(priv);
        mutex_unlock(&priv->mutex);

        iwl3945_cancel_deferred_work(priv);
}

#define MAX_HW_RESTARTS 5

static int iwl3945_alloc_bcast_station(struct iwl_priv *priv)
{
        struct iwl_rxon_context *ctx = &priv->contexts[IWL_RXON_CTX_BSS];
        unsigned long flags;
        u8 sta_id;

        spin_lock_irqsave(&priv->sta_lock, flags);
        sta_id = iwl_legacy_prep_station(priv, ctx,
                                        iwlegacy_bcast_addr, false, NULL);
        if (sta_id == IWL_INVALID_STATION) {
                IWL_ERR(priv, "Unable to prepare broadcast station\n");
                spin_unlock_irqrestore(&priv->sta_lock, flags);

                return -EINVAL;
        }

        priv->stations[sta_id].used |= IWL_STA_DRIVER_ACTIVE;
        priv->stations[sta_id].used |= IWL_STA_BCAST;
        spin_unlock_irqrestore(&priv->sta_lock, flags);

        return 0;
}

static int __iwl3945_up(struct iwl_priv *priv)
{
        int rc, i;

        rc = iwl3945_alloc_bcast_station(priv);
        if (rc)
                return rc;

        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 bring up\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);
                IWL_WARN(priv, "Radio disabled by HW RF Kill switch\n");
                return -ENODEV;
        }

        iwl_write32(priv, CSR_INT, 0xFFFFFFFF);

        rc = iwl3945_hw_nic_init(priv);
        if (rc) {
                IWL_ERR(priv, "Unable to int nic\n");
                return rc;
        }

        /* 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);

        /* We return success when we resume from suspend and rf_kill is on. */
        if (test_bit(STATUS_RF_KILL_HW, &priv->status))
                return 0;

        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 */
                rc = priv->cfg->ops->lib->load_ucode(priv);

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

                /* start card; "initialize" will load runtime ucode */
                iwl3945_nic_start(priv);

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

                return 0;
        }

        set_bit(STATUS_EXIT_PENDING, &priv->status);
        __iwl3945_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 iwl3945_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;

        iwl3945_init_alive_start(priv);
out:
        mutex_unlock(&priv->mutex);
}

static void iwl3945_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;

        iwl3945_alive_start(priv);
out:
        mutex_unlock(&priv->mutex);
}

/*
 * 3945 cannot interrupt driver when hardware rf kill switch toggles;
 * driver must poll CSR_GP_CNTRL_REG register for change.  This register
 * *is* readable even when device has been SW_RESET into low power mode
 * (e.g. during RF KILL).
 */
static void iwl3945_rfkill_poll(struct work_struct *data)
{
        struct iwl_priv *priv =
            container_of(data, struct iwl_priv, _3945.rfkill_poll.work);
        bool old_rfkill = test_bit(STATUS_RF_KILL_HW, &priv->status);
        bool new_rfkill = !(iwl_read32(priv, CSR_GP_CNTRL)
                        & CSR_GP_CNTRL_REG_FLAG_HW_RF_KILL_SW);

        if (new_rfkill != old_rfkill) {
                if (new_rfkill)
                        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, new_rfkill);

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

        /* Keep this running, even if radio now enabled.  This will be
         * cancelled in mac_start() if system decides to start again */
        queue_delayed_work(priv->workqueue, &priv->_3945.rfkill_poll,
                           round_jiffies_relative(2 * HZ));

}

int iwl3945_request_scan(struct iwl_priv *priv, struct ieee80211_vif *vif)
{
        struct iwl_host_cmd cmd = {
                .id = REPLY_SCAN_CMD,
                .len = sizeof(struct iwl3945_scan_cmd),
                .flags = CMD_SIZE_HUGE,
        };
        struct iwl3945_scan_cmd *scan;
        u8 n_probes = 0;
        enum ieee80211_band band;
        bool is_active = false;
        int ret;
        u16 len;

        lockdep_assert_held(&priv->mutex);

        if (!priv->scan_cmd) {
                priv->scan_cmd = kmalloc(sizeof(struct iwl3945_scan_cmd) +
                                         IWL_MAX_SCAN_SIZE, GFP_KERNEL);
                if (!priv->scan_cmd) {
                        IWL_DEBUG_SCAN(priv, "Fail to allocate scan memory\n");
                        return -ENOMEM;
                }
        }
        scan = priv->scan_cmd;
        memset(scan, 0, sizeof(struct iwl3945_scan_cmd) + IWL_MAX_SCAN_SIZE);

        scan->quiet_plcp_th = IWL_PLCP_QUIET_THRESH;
        scan->quiet_time = IWL_ACTIVE_QUIET_TIME;

        if (iwl_legacy_is_associated(priv, IWL_RXON_CTX_BSS)) {
                u16 interval;
                u32 extra;
                u32 suspend_time = 100;
                u32 scan_suspend_time = 100;

                IWL_DEBUG_INFO(priv, "Scanning while associated...\n");

                interval = vif->bss_conf.beacon_int;

                scan->suspend_time = 0;
                scan->max_out_time = cpu_to_le32(200 * 1024);
                if (!interval)
                        interval = suspend_time;
                /*
                 * suspend time format:
                 *  0-19: beacon interval in usec (time before exec.)
                 * 20-23: 0
                 * 24-31: number of beacons (suspend between channels)
                 */

                extra = (suspend_time / interval) << 24;
                scan_suspend_time = 0xFF0FFFFF &
                    (extra | ((suspend_time % interval) * 1024));

                scan->suspend_time = cpu_to_le32(scan_suspend_time);
                IWL_DEBUG_SCAN(priv, "suspend_time 0x%X beacon interval %d\n",
                               scan_suspend_time, interval);
        }

        if (priv->scan_request->n_ssids) {
                int i, p = 0;
                IWL_DEBUG_SCAN(priv, "Kicking off active scan\n");
                for (i = 0; i < priv->scan_request->n_ssids; i++) {
                        /* always does wildcard anyway */
                        if (!priv->scan_request->ssids[i].ssid_len)
                                continue;
                        scan->direct_scan[p].id = WLAN_EID_SSID;
                        scan->direct_scan[p].len =
                                priv->scan_request->ssids[i].ssid_len;
                        memcpy(scan->direct_scan[p].ssid,
                               priv->scan_request->ssids[i].ssid,
                               priv->scan_request->ssids[i].ssid_len);
                        n_probes++;
                        p++;
                }
                is_active = true;
        } else
                IWL_DEBUG_SCAN(priv, "Kicking off passive scan.\n");

        /* We don't build a direct scan probe request; the uCode will do
         * that based on the direct_mask added to each channel entry */
        scan->tx_cmd.tx_flags = TX_CMD_FLG_SEQ_CTL_MSK;
        scan->tx_cmd.sta_id = priv->contexts[IWL_RXON_CTX_BSS].bcast_sta_id;
        scan->tx_cmd.stop_time.life_time = TX_CMD_LIFE_TIME_INFINITE;

        /* flags + rate selection */

        switch (priv->scan_band) {
        case IEEE80211_BAND_2GHZ:
                scan->flags = RXON_FLG_BAND_24G_MSK | RXON_FLG_AUTO_DETECT_MSK;
                scan->tx_cmd.rate = IWL_RATE_1M_PLCP;
                band = IEEE80211_BAND_2GHZ;
                break;
        case IEEE80211_BAND_5GHZ:
                scan->tx_cmd.rate = IWL_RATE_6M_PLCP;
                band = IEEE80211_BAND_5GHZ;
                break;
        default:
                IWL_WARN(priv, "Invalid scan band\n");
                return -EIO;
        }

        /*
         * If active scaning is requested but a certain channel
         * is marked passive, we can do active scanning if we
         * detect transmissions.
         */
        scan->good_CRC_th = is_active ? IWL_GOOD_CRC_TH_DEFAULT :
                                        IWL_GOOD_CRC_TH_DISABLED;

        len = iwl_legacy_fill_probe_req(priv, (struct ieee80211_mgmt *)scan->data,
                                        vif->addr, priv->scan_request->ie,
                                        priv->scan_request->ie_len,
                                        IWL_MAX_SCAN_SIZE - sizeof(*scan));
        scan->tx_cmd.len = cpu_to_le16(len);

        /* select Rx antennas */
        scan->flags |= iwl3945_get_antenna_flags(priv);

        scan->channel_count = iwl3945_get_channels_for_scan(priv, band, is_active, n_probes,
                                                            (void *)&scan->data[len], vif);
        if (scan->channel_count == 0) {
                IWL_DEBUG_SCAN(priv, "channel count %d\n", scan->channel_count);
                return -EIO;
        }

        cmd.len += le16_to_cpu(scan->tx_cmd.len) +
            scan->channel_count * sizeof(struct iwl3945_scan_channel);
        cmd.data = scan;
        scan->len = cpu_to_le16(cmd.len);

        set_bit(STATUS_SCAN_HW, &priv->status);
        ret = iwl_legacy_send_cmd_sync(priv, &cmd);
        if (ret)
                clear_bit(STATUS_SCAN_HW, &priv->status);
        return ret;
}

void iwl3945_post_scan(struct iwl_priv *priv)
{
        struct iwl_rxon_context *ctx = &priv->contexts[IWL_RXON_CTX_BSS];

        /*
         * Since setting the RXON may have been deferred while
         * performing the scan, fire one off if needed
         */
        if (memcmp(&ctx->staging, &ctx->active, sizeof(ctx->staging)))
                iwl3945_commit_rxon(priv, ctx);
}

static void iwl3945_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;
                mutex_unlock(&priv->mutex);
                iwl3945_down(priv);
                ieee80211_restart_hw(priv->hw);
        } else {
                iwl3945_down(priv);

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

                __iwl3945_up(priv);
                mutex_unlock(&priv->mutex);
        }
}

static void iwl3945_bg_rx_replenish(struct work_struct *data)
{
        struct iwl_priv *priv =
            container_of(data, struct iwl_priv, rx_replenish);

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

        iwl3945_rx_replenish(priv);
out:
        mutex_unlock(&priv->mutex);
}

void iwl3945_post_associate(struct iwl_priv *priv)
{
        int rc = 0;
        struct ieee80211_conf *conf = NULL;
        struct iwl_rxon_context *ctx = &priv->contexts[IWL_RXON_CTX_BSS];

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

        IWL_DEBUG_ASSOC(priv, "Associated as %d to: %pM\n",
                        ctx->vif->bss_conf.aid, ctx->active.bssid_addr);

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

        iwl_legacy_scan_cancel_timeout(priv, 200);

        conf = iwl_legacy_ieee80211_get_hw_conf(priv->hw);

        ctx->staging.filter_flags &= ~RXON_FILTER_ASSOC_MSK;
        iwl3945_commit_rxon(priv, ctx);

        rc = iwl_legacy_send_rxon_timing(priv, ctx);
        if (rc)
                IWL_WARN(priv, "REPLY_RXON_TIMING failed - "
                            "Attempting to continue.\n");

        ctx->staging.filter_flags |= RXON_FILTER_ASSOC_MSK;

        ctx->staging.assoc_id = cpu_to_le16(ctx->vif->bss_conf.aid);

        IWL_DEBUG_ASSOC(priv, "assoc id %d beacon interval %d\n",
                        ctx->vif->bss_conf.aid, ctx->vif->bss_conf.beacon_int);

        if (ctx->vif->bss_conf.use_short_preamble)
                ctx->staging.flags |= RXON_FLG_SHORT_PREAMBLE_MSK;
        else
                ctx->staging.flags &= ~RXON_FLG_SHORT_PREAMBLE_MSK;

        if (ctx->staging.flags & RXON_FLG_BAND_24G_MSK) {
                if (ctx->vif->bss_conf.use_short_slot)
                        ctx->staging.flags |= RXON_FLG_SHORT_SLOT_MSK;
                else
                        ctx->staging.flags &= ~RXON_FLG_SHORT_SLOT_MSK;
        }

        iwl3945_commit_rxon(priv, ctx);

        switch (ctx->vif->type) {
        case NL80211_IFTYPE_STATION:
                iwl3945_rate_scale_init(priv->hw, IWL_AP_ID);
                break;
        case NL80211_IFTYPE_ADHOC:
                iwl3945_send_beacon_cmd(priv);
                break;
        default:
                IWL_ERR(priv, "%s Should not be called in %d mode\n",
                        __func__, ctx->vif->type);
                break;
        }
}

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

#define UCODE_READY_TIMEOUT     (2 * HZ)

static int iwl3945_mac_start(struct ieee80211_hw *hw)
{
        struct iwl_priv *priv = hw->priv;
        int ret;

        IWL_DEBUG_MAC80211(priv, "enter\n");

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

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

        if (!priv->ucode_code.len) {
                ret = iwl3945_read_ucode(priv);
                if (ret) {
                        IWL_ERR(priv, "Could not read microcode: %d\n", ret);
                        mutex_unlock(&priv->mutex);
                        goto out_release_irq;
                }
        }

        ret = __iwl3945_up(priv);

        mutex_unlock(&priv->mutex);

        if (ret)
                goto out_release_irq;

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

        /* Wait for START_ALIVE from 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,
                                "Wait for START_ALIVE timeout after %dms.\n",
                                jiffies_to_msecs(UCODE_READY_TIMEOUT));
                        ret = -ETIMEDOUT;
                        goto out_release_irq;
                }
        }

        /* ucode is running and will send rfkill notifications,
         * no need to poll the killswitch state anymore */
        cancel_delayed_work(&priv->_3945.rfkill_poll);

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

out_release_irq:
        priv->is_open = 0;
        IWL_DEBUG_MAC80211(priv, "leave - failed\n");
        return ret;
}

static void iwl3945_mac_stop(struct ieee80211_hw *hw)
{
        struct iwl_priv *priv = hw->priv;

        IWL_DEBUG_MAC80211(priv, "enter\n");

        if (!priv->is_open) {
                IWL_DEBUG_MAC80211(priv, "leave - skip\n");
                return;
        }

        priv->is_open = 0;

        iwl3945_down(priv);

        flush_workqueue(priv->workqueue);

        /* start polling the killswitch state again */
        queue_delayed_work(priv->workqueue, &priv->_3945.rfkill_poll,
                           round_jiffies_relative(2 * HZ));

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

static void iwl3945_mac_tx(struct ieee80211_hw *hw, struct sk_buff *skb)
{
        struct iwl_priv *priv = hw->priv;

        IWL_DEBUG_MAC80211(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 (iwl3945_tx_skb(priv, skb))
                dev_kfree_skb_any(skb);

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

void iwl3945_config_ap(struct iwl_priv *priv)
{
        struct iwl_rxon_context *ctx = &priv->contexts[IWL_RXON_CTX_BSS];
        struct ieee80211_vif *vif = ctx->vif;
        int rc = 0;

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

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

                /* RXON - unassoc (to set timing command) */
                ctx->staging.filter_flags &= ~RXON_FILTER_ASSOC_MSK;
                iwl3945_commit_rxon(priv, ctx);

                /* RXON Timing */
                rc = iwl_legacy_send_rxon_timing(priv, ctx);
                if (rc)
                        IWL_WARN(priv, "REPLY_RXON_TIMING failed - "
                                        "Attempting to continue.\n");

                ctx->staging.assoc_id = 0;

                if (vif->bss_conf.use_short_preamble)
                        ctx->staging.flags |=
                                RXON_FLG_SHORT_PREAMBLE_MSK;
                else
                        ctx->staging.flags &=
                                ~RXON_FLG_SHORT_PREAMBLE_MSK;

                if (ctx->staging.flags & RXON_FLG_BAND_24G_MSK) {
                        if (vif->bss_conf.use_short_slot)
                                ctx->staging.flags |=
                                        RXON_FLG_SHORT_SLOT_MSK;
                        else
                                ctx->staging.flags &=
                                        ~RXON_FLG_SHORT_SLOT_MSK;
                }
                /* restore RXON assoc */
                ctx->staging.filter_flags |= RXON_FILTER_ASSOC_MSK;
                iwl3945_commit_rxon(priv, ctx);
        }
        iwl3945_send_beacon_cmd(priv);
}

static int iwl3945_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;
        int ret = 0;
        u8 sta_id = IWL_INVALID_STATION;
        u8 static_key;

        IWL_DEBUG_MAC80211(priv, "enter\n");

        if (iwl3945_mod_params.sw_crypto) {
                IWL_DEBUG_MAC80211(priv, "leave - hwcrypto disabled\n");
                return -EOPNOTSUPP;
        }

        /*
         * To support IBSS RSN, don't program group keys in IBSS, the
         * hardware will then not attempt to decrypt the frames.
         */
        if (vif->type == NL80211_IFTYPE_ADHOC &&
            !(key->flags & IEEE80211_KEY_FLAG_PAIRWISE))
                return -EOPNOTSUPP;

        static_key = !iwl_legacy_is_associated(priv, IWL_RXON_CTX_BSS);

        if (!static_key) {
                sta_id = iwl_legacy_sta_id_or_broadcast(
                                priv, &priv->contexts[IWL_RXON_CTX_BSS], sta);
                if (sta_id == IWL_INVALID_STATION)
                        return -EINVAL;
        }