/*

  Broadcom B43 wireless driver

  Transmission (TX/RX) related functions.

  Copyright (C) 2005 Martin Langer <martin-langer@gmx.de>
  Copyright (C) 2005 Stefano Brivio <stefano.brivio@polimi.it>
  Copyright (C) 2005, 2006 Michael Buesch <m@bues.ch>
  Copyright (C) 2005 Danny van Dyk <kugelfang@gentoo.org>
  Copyright (C) 2005 Andreas Jaggi <andreas.jaggi@waterwave.ch>

  This program is free software; you can redistribute it and/or modify
  it under the terms of the GNU General Public License as published by
  the Free Software Foundation; either version 2 of the License, or
  (at your option) any later version.

  This program is distributed in the hope that it will be useful,
  but WITHOUT ANY WARRANTY; without even the implied warranty of
  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  GNU General Public License for more details.

  You should have received a copy of the GNU General Public License
  along with this program; see the file COPYING.  If not, write to
  the Free Software Foundation, Inc., 51 Franklin Steet, Fifth Floor,
  Boston, MA 02110-1301, USA.

*/

#include "xmit.h"
#include "phy_common.h"
#include "dma.h"
#include "pio.h"

static const struct b43_tx_legacy_rate_phy_ctl_entry b43_tx_legacy_rate_phy_ctl[] = {
        { B43_CCK_RATE_1MB,     0x0,                    0x0 },
        { B43_CCK_RATE_2MB,     0x0,                    0x1 },
        { B43_CCK_RATE_5MB,     0x0,                    0x2 },
        { B43_CCK_RATE_11MB,    0x0,                    0x3 },
        { B43_OFDM_RATE_6MB,    B43_TXH_PHY1_CRATE_1_2, B43_TXH_PHY1_MODUL_BPSK },
        { B43_OFDM_RATE_9MB,    B43_TXH_PHY1_CRATE_3_4, B43_TXH_PHY1_MODUL_BPSK },
        { B43_OFDM_RATE_12MB,   B43_TXH_PHY1_CRATE_1_2, B43_TXH_PHY1_MODUL_QPSK },
        { B43_OFDM_RATE_18MB,   B43_TXH_PHY1_CRATE_3_4, B43_TXH_PHY1_MODUL_QPSK },
        { B43_OFDM_RATE_24MB,   B43_TXH_PHY1_CRATE_1_2, B43_TXH_PHY1_MODUL_QAM16 },
        { B43_OFDM_RATE_36MB,   B43_TXH_PHY1_CRATE_3_4, B43_TXH_PHY1_MODUL_QAM16 },
        { B43_OFDM_RATE_48MB,   B43_TXH_PHY1_CRATE_2_3, B43_TXH_PHY1_MODUL_QAM64 },
        { B43_OFDM_RATE_54MB,   B43_TXH_PHY1_CRATE_3_4, B43_TXH_PHY1_MODUL_QAM64 },
};

static const struct b43_tx_legacy_rate_phy_ctl_entry *
b43_tx_legacy_rate_phy_ctl_ent(u8 bitrate)
{
        const struct b43_tx_legacy_rate_phy_ctl_entry *e;
        unsigned int i;

        for (i = 0; i < ARRAY_SIZE(b43_tx_legacy_rate_phy_ctl); i++) {
                e = &(b43_tx_legacy_rate_phy_ctl[i]);
                if (e->bitrate == bitrate)
                        return e;
        }

        B43_WARN_ON(1);
        return NULL;
}

/* Extract the bitrate index out of a CCK PLCP header. */
static int b43_plcp_get_bitrate_idx_cck(struct b43_plcp_hdr6 *plcp)
{
        switch (plcp->raw[0]) {
        case 0x0A:
                return 0;
        case 0x14:
                return 1;
        case 0x37:
                return 2;
        case 0x6E:
                return 3;
        }
        return -1;
}

/* Extract the bitrate index out of an OFDM PLCP header. */
static int b43_plcp_get_bitrate_idx_ofdm(struct b43_plcp_hdr6 *plcp, bool ghz5)
{
        /* For 2 GHz band first OFDM rate is at index 4, see main.c */
        int base = ghz5 ? 0 : 4;

        switch (plcp->raw[0] & 0xF) {
        case 0xB:
                return base + 0;
        case 0xF:
                return base + 1;
        case 0xA:
                return base + 2;
        case 0xE:
                return base + 3;
        case 0x9:
                return base + 4;
        case 0xD:
                return base + 5;
        case 0x8:
                return base + 6;
        case 0xC:
                return base + 7;
        }
        return -1;
}

u8 b43_plcp_get_ratecode_cck(const u8 bitrate)
{
        switch (bitrate) {
        case B43_CCK_RATE_1MB:
                return 0x0A;
        case B43_CCK_RATE_2MB:
                return 0x14;
        case B43_CCK_RATE_5MB:
                return 0x37;
        case B43_CCK_RATE_11MB:
                return 0x6E;
        }
        B43_WARN_ON(1);
        return 0;
}

u8 b43_plcp_get_ratecode_ofdm(const u8 bitrate)
{
        switch (bitrate) {
        case B43_OFDM_RATE_6MB:
                return 0xB;
        case B43_OFDM_RATE_9MB:
                return 0xF;
        case B43_OFDM_RATE_12MB:
                return 0xA;
        case B43_OFDM_RATE_18MB:
                return 0xE;
        case B43_OFDM_RATE_24MB:
                return 0x9;
        case B43_OFDM_RATE_36MB:
                return 0xD;
        case B43_OFDM_RATE_48MB:
                return 0x8;
        case B43_OFDM_RATE_54MB:
                return 0xC;
        }
        B43_WARN_ON(1);
        return 0;
}

void b43_generate_plcp_hdr(struct b43_plcp_hdr4 *plcp,
                           const u16 octets, const u8 bitrate)
{
        __u8 *raw = plcp->raw;

        if (b43_is_ofdm_rate(bitrate)) {
                u32 d;

                d = b43_plcp_get_ratecode_ofdm(bitrate);
                B43_WARN_ON(octets & 0xF000);
                d |= (octets << 5);
                plcp->data = cpu_to_le32(d);
        } else {
                u32 plen;

                plen = octets * 16 / bitrate;
                if ((octets * 16 % bitrate) > 0) {
                        plen++;
                        if ((bitrate == B43_CCK_RATE_11MB)
                            && ((octets * 8 % 11) < 4)) {
                                raw[1] = 0x84;
                        } else
                                raw[1] = 0x04;
                } else
                        raw[1] = 0x04;
                plcp->data |= cpu_to_le32(plen << 16);
                raw[0] = b43_plcp_get_ratecode_cck(bitrate);
        }
}

/* TODO: verify if needed for SSLPN or LCN  */
static u16 b43_generate_tx_phy_ctl1(struct b43_wldev *dev, u8 bitrate)
{
        const struct b43_phy *phy = &dev->phy;
        const struct b43_tx_legacy_rate_phy_ctl_entry *e;
        u16 control = 0;
        u16 bw;

        if (phy->type == B43_PHYTYPE_LP)
                bw = B43_TXH_PHY1_BW_20;
        else /* FIXME */
                bw = B43_TXH_PHY1_BW_20;

        if (0) { /* FIXME: MIMO */
        } else if (b43_is_cck_rate(bitrate) && phy->type != B43_PHYTYPE_LP) {
                control = bw;
        } else {
                control = bw;
                e = b43_tx_legacy_rate_phy_ctl_ent(bitrate);
                if (e) {
                        control |= e->coding_rate;
                        control |= e->modulation;
                }
                control |= B43_TXH_PHY1_MODE_SISO;
        }

        return control;
}

static u8 b43_calc_fallback_rate(u8 bitrate)
{
        switch (bitrate) {
        case B43_CCK_RATE_1MB:
                return B43_CCK_RATE_1MB;
        case B43_CCK_RATE_2MB:
                return B43_CCK_RATE_1MB;
        case B43_CCK_RATE_5MB:
                return B43_CCK_RATE_2MB;
        case B43_CCK_RATE_11MB:
                return B43_CCK_RATE_5MB;
        case B43_OFDM_RATE_6MB:
                return B43_CCK_RATE_5MB;
        case B43_OFDM_RATE_9MB:
                return B43_OFDM_RATE_6MB;
        case B43_OFDM_RATE_12MB:
                return B43_OFDM_RATE_9MB;
        case B43_OFDM_RATE_18MB:
                return B43_OFDM_RATE_12MB;
        case B43_OFDM_RATE_24MB:
                return B43_OFDM_RATE_18MB;
        case B43_OFDM_RATE_36MB:
                return B43_OFDM_RATE_24MB;
        case B43_OFDM_RATE_48MB:
                return B43_OFDM_RATE_36MB;
        case B43_OFDM_RATE_54MB:
                return B43_OFDM_RATE_48MB;
        }
        B43_WARN_ON(1);
        return 0;
}

/* Generate a TX data header. */
int b43_generate_txhdr(struct b43_wldev *dev,
                       u8 *_txhdr,
                       struct sk_buff *skb_frag,
                       struct ieee80211_tx_info *info,
                       u16 cookie)
{
        const unsigned char *fragment_data = skb_frag->data;
        unsigned int fragment_len = skb_frag->len;
        struct b43_txhdr *txhdr = (struct b43_txhdr *)_txhdr;
        const struct b43_phy *phy = &dev->phy;
        const struct ieee80211_hdr *wlhdr =
            (const struct ieee80211_hdr *)fragment_data;
        int use_encryption = !!info->control.hw_key;
        __le16 fctl = wlhdr->frame_control;
        struct ieee80211_rate *fbrate;
        u8 rate, rate_fb;
        int rate_ofdm, rate_fb_ofdm;
        unsigned int plcp_fragment_len;
        u32 mac_ctl = 0;
        u16 phy_ctl = 0;
        bool fill_phy_ctl1 = (phy->type == B43_PHYTYPE_LP ||
                              phy->type == B43_PHYTYPE_N ||
                              phy->type == B43_PHYTYPE_HT);
        u8 extra_ft = 0;
        struct ieee80211_rate *txrate;
        struct ieee80211_tx_rate *rates;

        memset(txhdr, 0, sizeof(*txhdr));

        txrate = ieee80211_get_tx_rate(dev->wl->hw, info);
        rate = txrate ? txrate->hw_value : B43_CCK_RATE_1MB;
        rate_ofdm = b43_is_ofdm_rate(rate);
        fbrate = ieee80211_get_alt_retry_rate(dev->wl->hw, info, 0) ? : txrate;
        rate_fb = fbrate->hw_value;
        rate_fb_ofdm = b43_is_ofdm_rate(rate_fb);

        if (rate_ofdm)
                txhdr->phy_rate = b43_plcp_get_ratecode_ofdm(rate);
        else
                txhdr->phy_rate = b43_plcp_get_ratecode_cck(rate);
        txhdr->mac_frame_ctl = wlhdr->frame_control;
        memcpy(txhdr->tx_receiver, wlhdr->addr1, ETH_ALEN);

        /* Calculate duration for fallback rate */
        if ((rate_fb == rate) ||
            (wlhdr->duration_id & cpu_to_le16(0x8000)) ||
            (wlhdr->duration_id == cpu_to_le16(0))) {
                /* If the fallback rate equals the normal rate or the
                 * dur_id field contains an AID, CFP magic or 0,
                 * use the original dur_id field. */
                txhdr->dur_fb = wlhdr->duration_id;
        } else {
                txhdr->dur_fb = ieee80211_generic_frame_duration(
                        dev->wl->hw, info->control.vif, info->band,
                        fragment_len, fbrate);
        }

        plcp_fragment_len = fragment_len + FCS_LEN;
        if (use_encryption) {
                u8 key_idx = info->control.hw_key->hw_key_idx;
                struct b43_key *key;
                int wlhdr_len;
                size_t iv_len;

                B43_WARN_ON(key_idx >= ARRAY_SIZE(dev->key));
                key = &(dev->key[key_idx]);

                if (unlikely(!key->keyconf)) {
                        /* This key is invalid. This might only happen
                         * in a short timeframe after machine resume before
                         * we were able to reconfigure keys.
                         * Drop this packet completely. Do not transmit it
                         * unencrypted to avoid leaking information. */
                        return -ENOKEY;
                }

                /* Hardware appends ICV. */
                plcp_fragment_len += info->control.hw_key->icv_len;

                key_idx = b43_kidx_to_fw(dev, key_idx);
                mac_ctl |= (key_idx << B43_TXH_MAC_KEYIDX_SHIFT) &
                           B43_TXH_MAC_KEYIDX;
                mac_ctl |= (key->algorithm << B43_TXH_MAC_KEYALG_SHIFT) &
                           B43_TXH_MAC_KEYALG;
                wlhdr_len = ieee80211_hdrlen(fctl);
                if (key->algorithm == B43_SEC_ALGO_TKIP) {
                        u16 phase1key[5];
                        int i;
                        /* we give the phase1key and iv16 here, the key is stored in
                         * shm. With that the hardware can do phase 2 and encryption.
                         */
                        ieee80211_get_tkip_p1k(info->control.hw_key, skb_frag, phase1key);
                        /* phase1key is in host endian. Copy to little-endian txhdr->iv. */
                        for (i = 0; i < 5; i++) {
                                txhdr->iv[i * 2 + 0] = phase1key[i];
                                txhdr->iv[i * 2 + 1] = phase1key[i] >> 8;
                        }
                        /* iv16 */
                        memcpy(txhdr->iv + 10, ((u8 *) wlhdr) + wlhdr_len, 3);
                } else {
                        iv_len = min_t(size_t, info->control.hw_key->iv_len,
                                     ARRAY_SIZE(txhdr->iv));
                        memcpy(txhdr->iv, ((u8 *) wlhdr) + wlhdr_len, iv_len);
                }
        }
        switch (dev->fw.hdr_format) {
        case B43_FW_HDR_598:
                b43_generate_plcp_hdr((struct b43_plcp_hdr4 *)(&txhdr->format_598.plcp),
                                      plcp_fragment_len, rate);
                break;
        case B43_FW_HDR_351:
                b43_generate_plcp_hdr((struct b43_plcp_hdr4 *)(&txhdr->format_351.plcp),
                                      plcp_fragment_len, rate);
                break;
        case B43_FW_HDR_410:
                b43_generate_plcp_hdr((struct b43_plcp_hdr4 *)(&txhdr->format_410.plcp),
                                      plcp_fragment_len, rate);
                break;
        }
        b43_generate_plcp_hdr((struct b43_plcp_hdr4 *)(&txhdr->plcp_fb),
                              plcp_fragment_len, rate_fb);

        /* Extra Frame Types */
        if (rate_fb_ofdm)
                extra_ft |= B43_TXH_EFT_FB_OFDM;
        else
                extra_ft |= B43_TXH_EFT_FB_CCK;

        /* Set channel radio code. Note that the micrcode ORs 0x100 to
         * this value before comparing it to the value in SHM, if this
         * is a 5Ghz packet.
         */
        txhdr->chan_radio_code = phy->channel;

        /* PHY TX Control word */
        if (rate_ofdm)
                phy_ctl |= B43_TXH_PHY_ENC_OFDM;
        else
                phy_ctl |= B43_TXH_PHY_ENC_CCK;
        if (info->control.rates[0].flags & IEEE80211_TX_RC_USE_SHORT_PREAMBLE)
                phy_ctl |= B43_TXH_PHY_SHORTPRMBL;

        switch (b43_ieee80211_antenna_sanitize(dev, 0)) {
        case 0: /* Default */
                phy_ctl |= B43_TXH_PHY_ANT01AUTO;
                break;
        case 1: /* Antenna 0 */
                phy_ctl |= B43_TXH_PHY_ANT0;
                break;
        case 2: /* Antenna 1 */
                phy_ctl |= B43_TXH_PHY_ANT1;
                break;
        case 3: /* Antenna 2 */
                phy_ctl |= B43_TXH_PHY_ANT2;
                break;
        case 4: /* Antenna 3 */
                phy_ctl |= B43_TXH_PHY_ANT3;
                break;
        default:
                B43_WARN_ON(1);
        }

        rates = info->control.rates;
        /* MAC control */
        if (!(info->flags & IEEE80211_TX_CTL_NO_ACK))
                mac_ctl |= B43_TXH_MAC_ACK;
        /* use hardware sequence counter as the non-TID counter */
        if (info->flags & IEEE80211_TX_CTL_ASSIGN_SEQ)
                mac_ctl |= B43_TXH_MAC_HWSEQ;
        if (info->flags & IEEE80211_TX_CTL_FIRST_FRAGMENT)
                mac_ctl |= B43_TXH_MAC_STMSDU;
        if (!phy->gmode)
                mac_ctl |= B43_TXH_MAC_5GHZ;

        /* Overwrite rates[0].count to make the retry calculation
         * in the tx status easier. need the actual retry limit to
         * detect whether the fallback rate was used.
         */
        if ((rates[0].flags & IEEE80211_TX_RC_USE_RTS_CTS) ||
            (rates[0].count <= dev->wl->hw->conf.long_frame_max_tx_count)) {
                rates[0].count = dev->wl->hw->conf.long_frame_max_tx_count;
                mac_ctl |= B43_TXH_MAC_LONGFRAME;
        } else {
                rates[0].count = dev->wl->hw->conf.short_frame_max_tx_count;
        }

        /* Generate the RTS or CTS-to-self frame */
        if ((rates[0].flags & IEEE80211_TX_RC_USE_RTS_CTS) ||
            (rates[0].flags & IEEE80211_TX_RC_USE_CTS_PROTECT)) {
                unsigned int len;
                struct ieee80211_hdr *uninitialized_var(hdr);
                int rts_rate, rts_rate_fb;
                int rts_rate_ofdm, rts_rate_fb_ofdm;
                struct b43_plcp_hdr6 *uninitialized_var(plcp);
                struct ieee80211_rate *rts_cts_rate;

                rts_cts_rate = ieee80211_get_rts_cts_rate(dev->wl->hw, info);

                rts_rate = rts_cts_rate ? rts_cts_rate->hw_value : B43_CCK_RATE_1MB;
                rts_rate_ofdm = b43_is_ofdm_rate(rts_rate);
                rts_rate_fb = b43_calc_fallback_rate(rts_rate);
                rts_rate_fb_ofdm = b43_is_ofdm_rate(rts_rate_fb);

                if (rates[0].flags & IEEE80211_TX_RC_USE_CTS_PROTECT) {
                        struct ieee80211_cts *uninitialized_var(cts);

                        switch (dev->fw.hdr_format) {
                        case B43_FW_HDR_598:
                                cts = (struct ieee80211_cts *)
                                        (txhdr->format_598.rts_frame);
                                break;
                        case B43_FW_HDR_351:
                                cts = (struct ieee80211_cts *)
                                        (txhdr->format_351.rts_frame);
                                break;
                        case B43_FW_HDR_410:
                                cts = (struct ieee80211_cts *)
                                        (txhdr->format_410.rts_frame);
                                break;
                        }
                        ieee80211_ctstoself_get(dev->wl->hw, info->control.vif,
                                                fragment_data, fragment_len,
                                                info, cts);
                        mac_ctl |= B43_TXH_MAC_SENDCTS;
                        len = sizeof(struct ieee80211_cts);
                } else {
                        struct ieee80211_rts *uninitialized_var(rts);

                        switch (dev->fw.hdr_format) {
                        case B43_FW_HDR_598:
                                rts = (struct ieee80211_rts *)
                                        (txhdr->format_598.rts_frame);
                                break;
                        case B43_FW_HDR_351:
                                rts = (struct ieee80211_rts *)
                                        (txhdr->format_351.rts_frame);
                                break;
                        case B43_FW_HDR_410:
                                rts = (struct ieee80211_rts *)
                                        (txhdr->format_410.rts_frame);
                                break;
                        }
                        ieee80211_rts_get(dev->wl->hw, info->control.vif,
                                          fragment_data, fragment_len,
                                          info, rts);
                        mac_ctl |= B43_TXH_MAC_SENDRTS;
                        len = sizeof(struct ieee80211_rts);
                }
                len += FCS_LEN;

                /* Generate the PLCP headers for the RTS/CTS frame */
                switch (dev->fw.hdr_format) {
                case B43_FW_HDR_598:
                        plcp = &txhdr->format_598.rts_plcp;
                        break;
                case B43_FW_HDR_351:
                        plcp = &txhdr->format_351.rts_plcp;
                        break;
                case B43_FW_HDR_410:
                        plcp = &txhdr->format_410.rts_plcp;
                        break;
                }
                b43_generate_plcp_hdr((struct b43_plcp_hdr4 *)plcp,
                                      len, rts_rate);
                plcp = &txhdr->rts_plcp_fb;
                b43_generate_plcp_hdr((struct b43_plcp_hdr4 *)plcp,
                                      len, rts_rate_fb);

                switch (dev->fw.hdr_format) {
                case B43_FW_HDR_598:
                        hdr = (struct ieee80211_hdr *)
                                (&txhdr->format_598.rts_frame);
                        break;
                case B43_FW_HDR_351:
                        hdr = (struct ieee80211_hdr *)
                                (&txhdr->format_351.rts_frame);
                        break;
                case B43_FW_HDR_410:
                        hdr = (struct ieee80211_hdr *)
                                (&txhdr->format_410.rts_frame);
                        break;
                }
                txhdr->rts_dur_fb = hdr->duration_id;

                if (rts_rate_ofdm) {
                        extra_ft |= B43_TXH_EFT_RTS_OFDM;
                        txhdr->phy_rate_rts =
                            b43_plcp_get_ratecode_ofdm(rts_rate);
                } else {
                        extra_ft |= B43_TXH_EFT_RTS_CCK;
                        txhdr->phy_rate_rts =
                            b43_plcp_get_ratecode_cck(rts_rate);
                }
                if (rts_rate_fb_ofdm)
                        extra_ft |= B43_TXH_EFT_RTSFB_OFDM;
                else
                        extra_ft |= B43_TXH_EFT_RTSFB_CCK;

                if (rates[0].flags & IEEE80211_TX_RC_USE_RTS_CTS &&
                    fill_phy_ctl1) {
                        txhdr->phy_ctl1_rts = cpu_to_le16(
                                b43_generate_tx_phy_ctl1(dev, rts_rate));
                        txhdr->phy_ctl1_rts_fb = cpu_to_le16(
                                b43_generate_tx_phy_ctl1(dev, rts_rate_fb));
                }
        }

        /* Magic cookie */
        switch (dev->fw.hdr_format) {
        case B43_FW_HDR_598:
                txhdr->format_598.cookie = cpu_to_le16(cookie);
                break;
        case B43_FW_HDR_351:
                txhdr->format_351.cookie = cpu_to_le16(cookie);
                break;
        case B43_FW_HDR_410:
                txhdr->format_410.cookie = cpu_to_le16(cookie);
                break;
        }

        if (fill_phy_ctl1) {
                txhdr->phy_ctl1 =
                        cpu_to_le16(b43_generate_tx_phy_ctl1(dev, rate));
                txhdr->phy_ctl1_fb =
                        cpu_to_le16(b43_generate_tx_phy_ctl1(dev, rate_fb));
        }

        /* Apply the bitfields */
        txhdr->mac_ctl = cpu_to_le32(mac_ctl);
        txhdr->phy_ctl = cpu_to_le16(phy_ctl);
        txhdr->extra_ft = extra_ft;

        return 0;
}

static s8 b43_rssi_postprocess(struct b43_wldev *dev,
                               u8 in_rssi, int ofdm,
                               int adjust_2053, int adjust_2050)
{
        struct b43_phy *phy = &dev->phy;
        struct b43_phy_g *gphy = phy->g;
        s32 tmp;

        switch (phy->radio_ver) {
        case 0x2050:
                if (ofdm) {
                        tmp = in_rssi;
                        if (tmp > 127)
                                tmp -= 256;
                        tmp *= 73;
                        tmp /= 64;
                        if (adjust_2050)
                                tmp += 25;
                        else
                                tmp -= 3;
                } else {
                        if (dev->dev->bus_sprom->
                            boardflags_lo & B43_BFL_RSSI) {
                                if (in_rssi > 63)
                                        in_rssi = 63;
                                B43_WARN_ON(phy->type != B43_PHYTYPE_G);
                                tmp = gphy->nrssi_lt[in_rssi];
                                tmp = 31 - tmp;
                                tmp *= -131;
                                tmp /= 128;
                                tmp -= 57;
                        } else {
                                tmp = in_rssi;
                                tmp = 31 - tmp;
                                tmp *= -149;
                                tmp /= 128;
                                tmp -= 68;
                        }
                        if (phy->type == B43_PHYTYPE_G && adjust_2050)
                                tmp += 25;
                }
                break;
        case 0x2060:
                if (in_rssi > 127)
                        tmp = in_rssi - 256;
                else
                        tmp = in_rssi;
                break;
        default:
                tmp = in_rssi;
                tmp -= 11;
                tmp *= 103;
                tmp /= 64;
                if (adjust_2053)
                        tmp -= 109;
                else
                        tmp -= 83;
        }

        return (s8) tmp;
}

//TODO
#if 0
static s8 b43_rssinoise_postprocess(struct b43_wldev *dev, u8 in_rssi)
{
        struct b43_phy *phy = &dev->phy;
        s8 ret;

        if (phy->type == B43_PHYTYPE_A) {
                //TODO: Incomplete specs.
                ret = 0;
        } else
                ret = b43_rssi_postprocess(dev, in_rssi, 0, 1, 1);

        return ret;
}
#endif

void b43_rx(struct b43_wldev *dev, struct sk_buff *skb, const void *_rxhdr)
{
        struct ieee80211_rx_status status;
        struct b43_plcp_hdr6 *plcp;
        struct ieee80211_hdr *wlhdr;
        const struct b43_rxhdr_fw4 *rxhdr = _rxhdr;
        __le16 fctl;
        u16 phystat0, phystat3;
        u16 uninitialized_var(chanstat), uninitialized_var(mactime);
        u32 uninitialized_var(macstat);
        u16 chanid;
        u16 phytype;
        int padding, rate_idx;

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

        /* Get metadata about the frame from the header. */
        phystat0 = le16_to_cpu(rxhdr->phy_status0);
        phystat3 = le16_to_cpu(rxhdr->phy_status3);
        switch (dev->fw.hdr_format) {
        case B43_FW_HDR_598:
                macstat = le32_to_cpu(rxhdr->format_598.mac_status);
                mactime = le16_to_cpu(rxhdr->format_598.mac_time);
                chanstat = le16_to_cpu(rxhdr->format_598.channel);
                break;
        case B43_FW_HDR_410:
        case B43_FW_HDR_351:
                macstat = le32_to_cpu(rxhdr->format_351.mac_status);
                mactime = le16_to_cpu(rxhdr->format_351.mac_time);
                chanstat = le16_to_cpu(rxhdr->format_351.channel);
                break;
        }
        phytype = chanstat & B43_RX_CHAN_PHYTYPE;

        if (unlikely(macstat & B43_RX_MAC_FCSERR)) {
                dev->wl->ieee_stats.dot11FCSErrorCount++;
                status.flag |= RX_FLAG_FAILED_FCS_CRC;
        }
        if (unlikely(phystat0 & (B43_RX_PHYST0_PLCPHCF | B43_RX_PHYST0_PLCPFV)))
                status.flag |= RX_FLAG_FAILED_PLCP_CRC;
        if (phystat0 & B43_RX_PHYST0_SHORTPRMBL)
                status.flag |= RX_FLAG_SHORTPRE;
        if (macstat & B43_RX_MAC_DECERR) {
                /* Decryption with the given key failed.
                 * Drop the packet. We also won't be able to decrypt it with
                 * the key in software. */
                goto drop;
        }

        /* Skip PLCP and padding */
        padding = (macstat & B43_RX_MAC_PADDING) ? 2 : 0;
        if (unlikely(skb->len < (sizeof(struct b43_plcp_hdr6) + padding))) {
                b43dbg(dev->wl, "RX: Packet size underrun (1)\n");
                goto drop;
        }
        plcp = (struct b43_plcp_hdr6 *)(skb->data + padding);
        skb_pull(skb, sizeof(struct b43_plcp_hdr6) + padding);
        /* The skb contains the Wireless Header + payload data now */
        if (unlikely(skb->len < (2 + 2 + 6 /*minimum hdr */  + FCS_LEN))) {
                b43dbg(dev->wl, "RX: Packet size underrun (2)\n");
                goto drop;
        }
        wlhdr = (struct ieee80211_hdr *)(skb->data);
        fctl = wlhdr->frame_control;

        if (macstat & B43_RX_MAC_DEC) {
                unsigned int keyidx;
                int wlhdr_len;

                keyidx = ((macstat & B43_RX_MAC_KEYIDX)
                          >> B43_RX_MAC_KEYIDX_SHIFT);
                /* We must adjust the key index here. We want the "physical"
                 * key index, but the ucode passed it slightly different.
                 */
                keyidx = b43_kidx_to_raw(dev, keyidx);
                B43_WARN_ON(keyidx >= ARRAY_SIZE(dev->key));

                if (dev->key[keyidx].algorithm != B43_SEC_ALGO_NONE) {
                        wlhdr_len = ieee80211_hdrlen(fctl);
                        if (unlikely(skb->len < (wlhdr_len + 3))) {
                                b43dbg(dev->wl,
                                       "RX: Packet size underrun (3)\n");
                                goto drop;
                        }
                        status.flag |= RX_FLAG_DECRYPTED;
                }
        }

        /* Link quality statistics */
        switch (chanstat & B43_RX_CHAN_PHYTYPE) {
        case B43_PHYTYPE_HT:
                /* TODO: is max the right choice? */
                status.signal = max_t(__s8,
                        max(rxhdr->phy_ht_power0, rxhdr->phy_ht_power1),
                        rxhdr->phy_ht_power2);
                break;
        case B43_PHYTYPE_N:
                /* Broadcom has code for min and avg, but always uses max */
                if (rxhdr->power0 == 16 || rxhdr->power0 == 32)
                        status.signal = max(rxhdr->power1, rxhdr->power2);
                else
                        status.signal = max(rxhdr->power0, rxhdr->power1);
                break;
        case B43_PHYTYPE_A:
        case B43_PHYTYPE_B:
        case B43_PHYTYPE_G:
        case B43_PHYTYPE_LP:
                status.signal = b43_rssi_postprocess(dev, rxhdr->jssi,
                                                  (phystat0 & B43_RX_PHYST0_OFDM),
                                                  (phystat0 & B43_RX_PHYST0_GAINCTL),
                                                  (phystat3 & B43_RX_PHYST3_TRSTATE));
                break;
        }

        if (phystat0 & B43_RX_PHYST0_OFDM)
                rate_idx = b43_plcp_get_bitrate_idx_ofdm(plcp,
                                        !!(chanstat & B43_RX_CHAN_5GHZ));
        else
                rate_idx = b43_plcp_get_bitrate_idx_cck(plcp);
        if (unlikely(rate_idx == -1)) {
                /* PLCP seems to be corrupted.
                 * Drop the frame, if we are not interested in corrupted frames. */
                if (!(dev->wl->filter_flags & FIF_PLCPFAIL))
                        goto drop;
        }
        status.rate_idx = rate_idx;
        status.antenna = !!(phystat0 & B43_RX_PHYST0_ANT);

        /*
         * All frames on monitor interfaces and beacons always need a full
         * 64-bit timestamp. Monitor interfaces need it for diagnostic
         * purposes and beacons for IBSS merging.
         * This code assumes we get to process the packet within 16 bits
         * of timestamp, i.e. about 65 milliseconds after the PHY received
         * the first symbol.
         */
        if (ieee80211_is_beacon(fctl) || dev->wl->radiotap_enabled) {
                u16 low_mactime_now;

                b43_tsf_read(dev, &status.mactime);
                low_mactime_now = status.mactime;
                status.mactime = status.mactime & ~0xFFFFULL;
                status.mactime += mactime;
                if (low_mactime_now <= mactime)
                        status.mactime -= 0x10000;
                status.flag |= RX_FLAG_MACTIME_START;
        }

        chanid = (chanstat & B43_RX_CHAN_ID) >> B43_RX_CHAN_ID_SHIFT;
        switch (chanstat & B43_RX_CHAN_PHYTYPE) {
        case B43_PHYTYPE_A:
                status.band = IEEE80211_BAND_5GHZ;
                B43_WARN_ON(1);
                /* FIXME: We don't really know which value the "chanid" contains.
                 *        So the following assignment might be wrong. */
                status.freq =
                        ieee80211_channel_to_frequency(chanid, status.band);
                break;
        case B43_PHYTYPE_G:
                status.band = IEEE80211_BAND_2GHZ;
                /* Somewhere between 478.104 and 508.1084 firmware for G-PHY
                 * has been modified to be compatible with N-PHY and others.
                 */
                if (dev->fw.rev >= 508)
                        status.freq = ieee80211_channel_to_frequency(chanid, status.band);
                else
                        status.freq = chanid + 2400;
                break;
        case B43_PHYTYPE_N:
        case B43_PHYTYPE_LP:
        case B43_PHYTYPE_HT:
                /* chanid is the SHM channel cookie. Which is the plain
                 * channel number in b43. */
                if (chanstat & B43_RX_CHAN_5GHZ)
                        status.band = IEEE80211_BAND_5GHZ;
                else
                        status.band = IEEE80211_BAND_2GHZ;
                status.freq =
                        ieee80211_channel_to_frequency(chanid, status.band);
                break;
        default:
                B43_WARN_ON(1);
                goto drop;
        }

        memcpy(IEEE80211_SKB_RXCB(skb), &status, sizeof(status));
        ieee80211_rx_ni(dev->wl->hw, skb);

#if B43_DEBUG
        dev->rx_count++;
#endif
        return;
drop:
        dev_kfree_skb_any(skb);
}

void b43_handle_txstatus(struct b43_wldev *dev,
                         const struct b43_txstatus *status)
{
        b43_debugfs_log_txstat(dev, status);

        if (status->intermediate)
                return;
        if (status->for_ampdu)
                return;
        if (!status->acked)
                dev->wl->ieee_stats.dot11ACKFailureCount++;
        if (status->rts_count) {
                if (status->rts_count == 0xF)   //FIXME
                        dev->wl->ieee_stats.dot11RTSFailureCount++;
                else
                        dev->wl->ieee_stats.dot11RTSSuccessCount++;
        }

        if (b43_using_pio_transfers(dev))
                b43_pio_handle_txstatus(dev, status);
        else
                b43_dma_handle_txstatus(dev, status);

        b43_phy_txpower_check(dev, 0);
}

/* Fill out the mac80211 TXstatus report based on the b43-specific
 * txstatus report data. This returns a boolean whether the frame was
 * successfully transmitted. */
bool b43_fill_txstatus_report(struct b43_wldev *dev,
                              struct ieee80211_tx_info *report,
                              const struct b43_txstatus *status)
{
        bool frame_success = true;
        int retry_limit;

        /* preserve the confiured retry limit before clearing the status
         * The xmit function has overwritten the rc's value with the actual
         * retry limit done by the hardware */
        retry_limit = report->status.rates[0].count;
        ieee80211_tx_info_clear_status(report);

        if (status->acked) {
                /* The frame was ACKed. */
                report->flags |= IEEE80211_TX_STAT_ACK;
        } else {
                /* The frame was not ACKed... */
                if (!(report->flags & IEEE80211_TX_CTL_NO_ACK)) {
                        /* ...but we expected an ACK. */
                        frame_success = false;
                }
        }
        if (status->frame_count == 0) {
                /* The frame was not transmitted at all. */
                report->status.rates[0].count = 0;
        } else if (status->rts_count > dev->wl->hw->conf.short_frame_max_tx_count) {
                /*
                 * If the short retries (RTS, not data frame) have exceeded
                 * the limit, the hw will not have tried the selected rate,
                 * but will have used the fallback rate instead.
                 * Don't let the rate control count attempts for the selected
                 * rate in this case, otherwise the statistics will be off.
                 */
                report->status.rates[0].count = 0;
                report->status.rates[1].count = status->frame_count;
        } else {
                if (status->frame_count > retry_limit) {
                        report->status.rates[0].count = retry_limit;
                        report->status.rates[1].count = status->frame_count -
                                        retry_limit;

                } else {
                        report->status.rates[0].count = status->frame_count;
                        report->status.rates[1].idx = -1;
                }
        }

        return frame_success;
}

/* Stop any TX operation on the device (suspend the hardware queues) */
void b43_tx_suspend(struct b43_wldev *dev)
{
        if (b43_using_pio_transfers(dev))
                b43_pio_tx_suspend(dev);
        else
                b43_dma_tx_suspend(dev);
}

/* Resume any TX operation on the device (resume the hardware queues) */
void b43_tx_resume(struct b43_wldev *dev)
{
        if (b43_using_pio_transfers(dev))
                b43_pio_tx_resume(dev);
        else
                b43_dma_tx_resume(dev);
}