drivers/staging/vt6655/dpc.c

   1 /*
   2  * Copyright (c) 1996, 2003 VIA Networking Technologies, Inc.
   3  * All rights reserved.
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation; either version 2 of the License, or
   8  * (at your option) any later version.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License along
  16  * with this program; if not, write to the Free Software Foundation, Inc.,
  17  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  18  *
  19  * File: dpc.c
  20  *
  21  * Purpose: handle dpc rx functions
  22  *
  23  * Author: Lyndon Chen
  24  *
  25  * Date: May 20, 2003
  26  *
  27  * Functions:
  28  *
  29  * Revision History:
  30  *
  31  */
  32
  33 #include "device.h"
  34 #include "baseband.h"
  35 #include "rf.h"
  36 #include "dpc.h"
  37
  38 static bool vnt_rx_data(struct vnt_private *priv, struct sk_buff *skb,
  39                         u16 bytes_received)
  40 {
  41         struct ieee80211_hw *hw = priv->hw;
  42         struct ieee80211_supported_band *sband;
  43         struct ieee80211_rx_status rx_status = { 0 };
  44         struct ieee80211_hdr *hdr;
  45         __le16 fc;
  46         u8 *rsr, *new_rsr, *rssi;
  47         __le64 *tsf_time;
  48         u16 frame_size;
  49         int ii, r;
  50         u8 *rx_sts, *rx_rate, *sq;
  51         u8 *skb_data;
  52         u8 rate_idx = 0;
  53         u8 rate[MAX_RATE] = {2, 4, 11, 22, 12, 18, 24, 36, 48, 72, 96, 108};
  54         long rx_dbm;
  55
  56         /* [31:16]RcvByteCount ( not include 4-byte Status ) */
  57         frame_size = le16_to_cpu(*((__le16 *)(skb->data + 2)));
  58         if (frame_size > 2346 || frame_size < 14) {
  59                 dev_dbg(&priv->pcid->dev, "------- WRONG Length 1\n");
  60                 return false;
  61         }
  62
  63         skb_data = (u8 *)skb->data;
  64
  65         rx_sts = skb_data;
  66         rx_rate = skb_data + 1;
  67
  68         sband = hw->wiphy->bands[hw->conf.chandef.chan->band];
  69
  70         for (r = RATE_1M; r < MAX_RATE; r++) {
  71                 if (*rx_rate == rate[r])
  72                         break;
  73         }
  74
  75         priv->rx_rate = r;
  76
  77         for (ii = 0; ii < sband->n_bitrates; ii++) {
  78                 if (sband->bitrates[ii].hw_value == r) {
  79                         rate_idx = ii;
  80                                 break;
  81                 }
  82         }
  83
  84         if (ii == sband->n_bitrates) {
  85                 dev_dbg(&priv->pcid->dev, "Wrong RxRate %x\n", *rx_rate);
  86                 return false;
  87         }
  88
  89         tsf_time = (__le64 *)(skb_data + bytes_received - 12);
  90         sq = skb_data + bytes_received - 4;
  91         new_rsr = skb_data + bytes_received - 3;
  92         rssi = skb_data + bytes_received - 2;
  93         rsr = skb_data + bytes_received - 1;
  94         if (*rsr & (RSR_IVLDTYP | RSR_IVLDLEN))
  95                 return false;
  96
  97         RFvRSSITodBm(priv, *rssi, &rx_dbm);
  98
  99         priv->byBBPreEDRSSI = (u8)rx_dbm + 1;
 100         priv->uCurrRSSI = *rssi;
 101
 102         skb_pull(skb, 4);
 103         skb_trim(skb, frame_size);
 104
 105         rx_status.mactime = le64_to_cpu(*tsf_time);
 106         rx_status.band = hw->conf.chandef.chan->band;
 107         rx_status.signal = rx_dbm;
 108         rx_status.flag = 0;
 109         rx_status.freq = hw->conf.chandef.chan->center_freq;
 110
 111         if (!(*rsr & RSR_CRCOK))
 112                 rx_status.flag |= RX_FLAG_FAILED_FCS_CRC;
 113
 114         hdr = (struct ieee80211_hdr *)(skb->data);
 115         fc = hdr->frame_control;
 116
 117         rx_status.rate_idx = rate_idx;
 118
 119         if (ieee80211_has_protected(fc)) {
 120                 if (priv->byLocalID > REV_ID_VT3253_A1)
 121                         rx_status.flag |= RX_FLAG_DECRYPTED;
 122
 123                 /* Drop packet */
 124                 if (!(*new_rsr & NEWRSR_DECRYPTOK))
 125                         return false;
 126         }
 127
 128         memcpy(IEEE80211_SKB_RXCB(skb), &rx_status, sizeof(rx_status));
 129
 130         ieee80211_rx_irqsafe(priv->hw, skb);
 131
 132         return true;
 133 }
 134
 135 bool vnt_receive_frame(struct vnt_private *priv, struct vnt_rx_desc *curr_rd)
 136 {
 137         struct vnt_rd_info *rd_info = curr_rd->rd_info;
 138         struct sk_buff *skb;
 139         u16 frame_size;
 140
 141         skb = rd_info->skb;
 142
 143         dma_unmap_single(&priv->pcid->dev, rd_info->skb_dma,
 144                          priv->rx_buf_sz, DMA_FROM_DEVICE);
 145
 146         frame_size = le16_to_cpu(curr_rd->rd1.req_count)
 147                         - le16_to_cpu(curr_rd->rd0.res_count);
 148
 149         if ((frame_size > 2364) || (frame_size < 33)) {
 150                 /* Frame Size error drop this packet.*/
 151                 dev_dbg(&priv->pcid->dev, "Wrong frame size %d\n", frame_size);
 152                 dev_kfree_skb_irq(skb);
 153                 return true;
 154         }
 155
 156         if (vnt_rx_data(priv, skb, frame_size))
 157                 return true;
 158
 159         dev_kfree_skb_irq(skb);
 160
 161         return true;
 162 }