Add the rt linux 4.1.3-rt3 as base
[kvmfornfv.git] / kernel / 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, PSRxDesc curr_rd)
136 {
137         PDEVICE_RD_INFO rd_info = curr_rd->pRDInfo;
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->m_rd1RD1.wReqCount)
147                         - cpu_to_le16(curr_rd->m_rd0RD0.wResCount);
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 }