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35f00cfc | 1 | /* |
9c9a0d14 | 2 | Copyright (C) 2004 - 2009 Ivo van Doorn <IvDoorn@gmail.com> |
35f00cfc ID |
3 | <http://rt2x00.serialmonkey.com> |
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 | |
16 | along with this program; if not, write to the | |
17 | Free Software Foundation, Inc., | |
18 | 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. | |
19 | */ | |
20 | ||
21 | /* | |
22 | Module: rt2x00lib | |
23 | Abstract: rt2x00 HT specific routines. | |
24 | */ | |
25 | ||
26 | #include <linux/kernel.h> | |
27 | #include <linux/module.h> | |
28 | ||
29 | #include "rt2x00.h" | |
30 | #include "rt2x00lib.h" | |
31 | ||
32 | void rt2x00ht_create_tx_descriptor(struct queue_entry *entry, | |
33 | struct txentry_desc *txdesc, | |
34 | const struct rt2x00_rate *hwrate) | |
35 | { | |
36 | struct ieee80211_tx_info *tx_info = IEEE80211_SKB_CB(entry->skb); | |
37 | struct ieee80211_tx_rate *txrate = &tx_info->control.rates[0]; | |
1affa091 | 38 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)entry->skb->data; |
35f00cfc ID |
39 | |
40 | if (tx_info->control.sta) | |
41 | txdesc->mpdu_density = | |
42 | tx_info->control.sta->ht_cap.ampdu_density; | |
43 | else | |
44 | txdesc->mpdu_density = 0; | |
45 | ||
46 | txdesc->ba_size = 7; /* FIXME: What value is needed? */ | |
bd96bd6b ID |
47 | |
48 | txdesc->stbc = | |
49 | (tx_info->flags & IEEE80211_TX_CTL_STBC) >> IEEE80211_TX_CTL_STBC_SHIFT; | |
35f00cfc | 50 | |
df7f4ebe HS |
51 | /* |
52 | * If IEEE80211_TX_RC_MCS is set txrate->idx just contains the | |
53 | * mcs rate to be used | |
54 | */ | |
55 | if (txrate->flags & IEEE80211_TX_RC_MCS) { | |
56 | txdesc->mcs = txrate->idx; | |
84804cdc ID |
57 | |
58 | /* | |
59 | * MIMO PS should be set to 1 for STA's using dynamic SM PS | |
60 | * when using more then one tx stream (>MCS7). | |
61 | */ | |
62 | if (tx_info->control.sta && txdesc->mcs > 7 && | |
63 | (tx_info->control.sta->ht_cap.cap & | |
64 | (WLAN_HT_CAP_SM_PS_DYNAMIC << | |
65 | IEEE80211_HT_CAP_SM_PS_SHIFT))) | |
66 | __set_bit(ENTRY_TXD_HT_MIMO_PS, &txdesc->flags); | |
df7f4ebe HS |
67 | } else { |
68 | txdesc->mcs = rt2x00_get_rate_mcs(hwrate->mcs); | |
69 | if (txrate->flags & IEEE80211_TX_RC_USE_SHORT_PREAMBLE) | |
70 | txdesc->mcs |= 0x08; | |
71 | } | |
72 | ||
35f00cfc ID |
73 | |
74 | /* | |
75 | * Convert flags | |
76 | */ | |
77 | if (tx_info->flags & IEEE80211_TX_CTL_AMPDU) | |
78 | __set_bit(ENTRY_TXD_HT_AMPDU, &txdesc->flags); | |
79 | ||
80 | /* | |
81 | * Determine HT Mix/Greenfield rate mode | |
82 | */ | |
83 | if (txrate->flags & IEEE80211_TX_RC_MCS) | |
84 | txdesc->rate_mode = RATE_MODE_HT_MIX; | |
85 | if (txrate->flags & IEEE80211_TX_RC_GREEN_FIELD) | |
86 | txdesc->rate_mode = RATE_MODE_HT_GREENFIELD; | |
87 | if (txrate->flags & IEEE80211_TX_RC_40_MHZ_WIDTH) | |
88 | __set_bit(ENTRY_TXD_HT_BW_40, &txdesc->flags); | |
89 | if (txrate->flags & IEEE80211_TX_RC_SHORT_GI) | |
90 | __set_bit(ENTRY_TXD_HT_SHORT_GI, &txdesc->flags); | |
1affa091 HS |
91 | |
92 | /* | |
93 | * Determine IFS values | |
94 | * - Use TXOP_BACKOFF for management frames | |
95 | * - Use TXOP_SIFS for fragment bursts | |
96 | * - Use TXOP_HTTXOP for everything else | |
97 | * | |
98 | * Note: rt2800 devices won't use CTS protection (if used) | |
99 | * for frames not transmitted with TXOP_HTTXOP | |
100 | */ | |
101 | if (ieee80211_is_mgmt(hdr->frame_control)) | |
102 | txdesc->txop = TXOP_BACKOFF; | |
103 | else if (!(tx_info->flags & IEEE80211_TX_CTL_FIRST_FRAGMENT)) | |
104 | txdesc->txop = TXOP_SIFS; | |
105 | else | |
106 | txdesc->txop = TXOP_HTTXOP; | |
35f00cfc | 107 | } |
06443e46 GW |
108 | |
109 | u16 rt2x00ht_center_channel(struct rt2x00_dev *rt2x00dev, | |
110 | struct ieee80211_conf *conf) | |
111 | { | |
112 | struct hw_mode_spec *spec = &rt2x00dev->spec; | |
113 | int center_channel; | |
114 | u16 i; | |
115 | ||
116 | /* | |
117 | * Initialize center channel to current channel. | |
118 | */ | |
119 | center_channel = spec->channels[conf->channel->hw_value].channel; | |
120 | ||
121 | /* | |
122 | * Adjust center channel to HT40+ and HT40- operation. | |
123 | */ | |
124 | if (conf_is_ht40_plus(conf)) | |
125 | center_channel += 2; | |
126 | else if (conf_is_ht40_minus(conf)) | |
127 | center_channel -= (center_channel == 14) ? 1 : 2; | |
128 | ||
129 | for (i = 0; i < spec->num_channels; i++) | |
130 | if (spec->channels[i].channel == center_channel) | |
131 | return i; | |
132 | ||
133 | WARN_ON(1); | |
134 | return conf->channel->hw_value; | |
135 | } |