]> Pileus Git - ~andy/linux/blob - drivers/net/wireless/ath/ath9k/mci.c
Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/linville/wirel...
[~andy/linux] / drivers / net / wireless / ath / ath9k / mci.c
1 /*
2  * Copyright (c) 2010-2011 Atheros Communications Inc.
3  *
4  * Permission to use, copy, modify, and/or distribute this software for any
5  * purpose with or without fee is hereby granted, provided that the above
6  * copyright notice and this permission notice appear in all copies.
7  *
8  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
9  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
10  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
11  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
12  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
13  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
14  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
15  */
16
17 #include "ath9k.h"
18 #include "mci.h"
19
20 u8 ath_mci_duty_cycle[] = { 0, 50, 60, 70, 80, 85, 90, 95, 98 };
21
22 static struct ath_mci_profile_info*
23 ath_mci_find_profile(struct ath_mci_profile *mci,
24                      struct ath_mci_profile_info *info)
25 {
26         struct ath_mci_profile_info *entry;
27
28         list_for_each_entry(entry, &mci->info, list) {
29                 if (entry->conn_handle == info->conn_handle)
30                         break;
31         }
32         return entry;
33 }
34
35 static bool ath_mci_add_profile(struct ath_common *common,
36                                 struct ath_mci_profile *mci,
37                                 struct ath_mci_profile_info *info)
38 {
39         struct ath_mci_profile_info *entry;
40
41         if ((mci->num_sco == ATH_MCI_MAX_SCO_PROFILE) &&
42             (info->type == MCI_GPM_COEX_PROFILE_VOICE)) {
43                 ath_dbg(common, ATH_DBG_MCI,
44                         "Too many SCO profile, failed to add new profile\n");
45                 return false;
46         }
47
48         if (((NUM_PROF(mci) - mci->num_sco) == ATH_MCI_MAX_ACL_PROFILE) &&
49             (info->type != MCI_GPM_COEX_PROFILE_VOICE)) {
50                 ath_dbg(common, ATH_DBG_MCI,
51                         "Too many ACL profile, failed to add new profile\n");
52                 return false;
53         }
54
55         entry = ath_mci_find_profile(mci, info);
56
57         if (entry)
58                 memcpy(entry, info, 10);
59         else {
60                 entry = kzalloc(sizeof(*entry), GFP_KERNEL);
61                 if (!entry)
62                         return false;
63
64                 memcpy(entry, info, 10);
65                 INC_PROF(mci, info);
66                 list_add_tail(&info->list, &mci->info);
67         }
68         return true;
69 }
70
71 static void ath_mci_del_profile(struct ath_common *common,
72                                 struct ath_mci_profile *mci,
73                                 struct ath_mci_profile_info *info)
74 {
75         struct ath_mci_profile_info *entry;
76
77         entry = ath_mci_find_profile(mci, info);
78
79         if (!entry) {
80                 ath_dbg(common, ATH_DBG_MCI,
81                         "Profile to be deleted not found\n");
82                 return;
83         }
84         DEC_PROF(mci, entry);
85         list_del(&entry->list);
86         kfree(entry);
87 }
88
89 void ath_mci_flush_profile(struct ath_mci_profile *mci)
90 {
91         struct ath_mci_profile_info *info, *tinfo;
92
93         list_for_each_entry_safe(info, tinfo, &mci->info, list) {
94                 list_del(&info->list);
95                 DEC_PROF(mci, info);
96                 kfree(info);
97         }
98         mci->aggr_limit = 0;
99 }
100
101 static void ath_mci_adjust_aggr_limit(struct ath_btcoex *btcoex)
102 {
103         struct ath_mci_profile *mci = &btcoex->mci;
104         u32 wlan_airtime = btcoex->btcoex_period *
105                                 (100 - btcoex->duty_cycle) / 100;
106
107         /*
108          * Scale: wlan_airtime is in ms, aggr_limit is in 0.25 ms.
109          * When wlan_airtime is less than 4ms, aggregation limit has to be
110          * adjusted half of wlan_airtime to ensure that the aggregation can fit
111          * without collision with BT traffic.
112          */
113         if ((wlan_airtime <= 4) &&
114             (!mci->aggr_limit || (mci->aggr_limit > (2 * wlan_airtime))))
115                 mci->aggr_limit = 2 * wlan_airtime;
116 }
117
118 static void ath_mci_update_scheme(struct ath_softc *sc)
119 {
120         struct ath_common *common = ath9k_hw_common(sc->sc_ah);
121         struct ath_btcoex *btcoex = &sc->btcoex;
122         struct ath_mci_profile *mci = &btcoex->mci;
123         struct ath_mci_profile_info *info;
124         u32 num_profile = NUM_PROF(mci);
125
126         if (num_profile == 1) {
127                 info = list_first_entry(&mci->info,
128                                         struct ath_mci_profile_info,
129                                         list);
130                 if (mci->num_sco && info->T == 12) {
131                         mci->aggr_limit = 8;
132                         ath_dbg(common, ATH_DBG_MCI,
133                                 "Single SCO, aggregation limit 2 ms\n");
134                 } else if ((info->type == MCI_GPM_COEX_PROFILE_BNEP) &&
135                            !info->master) {
136                         btcoex->btcoex_period = 60;
137                         ath_dbg(common, ATH_DBG_MCI,
138                                 "Single slave PAN/FTP, bt period 60 ms\n");
139                 } else if ((info->type == MCI_GPM_COEX_PROFILE_HID) &&
140                          (info->T > 0 && info->T < 50) &&
141                          (info->A > 1 || info->W > 1)) {
142                         btcoex->duty_cycle = 30;
143                         mci->aggr_limit = 8;
144                         ath_dbg(common, ATH_DBG_MCI,
145                                 "Multiple attempt/timeout single HID "
146                                 "aggregation limit 2 ms dutycycle 30%%\n");
147                 }
148         } else if ((num_profile == 2) && (mci->num_hid == 2)) {
149                 btcoex->duty_cycle = 30;
150                 mci->aggr_limit = 8;
151                 ath_dbg(common, ATH_DBG_MCI,
152                         "Two HIDs aggregation limit 2 ms dutycycle 30%%\n");
153         } else if (num_profile > 3) {
154                 mci->aggr_limit = 6;
155                 ath_dbg(common, ATH_DBG_MCI,
156                         "Three or more profiles aggregation limit 1.5 ms\n");
157         }
158
159         if (IS_CHAN_2GHZ(sc->sc_ah->curchan)) {
160                 if (IS_CHAN_HT(sc->sc_ah->curchan))
161                         ath_mci_adjust_aggr_limit(btcoex);
162                 else
163                         btcoex->btcoex_period >>= 1;
164         }
165
166         ath9k_hw_btcoex_disable(sc->sc_ah);
167         ath9k_btcoex_timer_pause(sc);
168
169         if (IS_CHAN_5GHZ(sc->sc_ah->curchan))
170                 return;
171
172         btcoex->duty_cycle += (mci->num_bdr ? ATH_MCI_MAX_DUTY_CYCLE : 0);
173         if (btcoex->duty_cycle > ATH_MCI_MAX_DUTY_CYCLE)
174                 btcoex->duty_cycle = ATH_MCI_MAX_DUTY_CYCLE;
175
176         btcoex->btcoex_period *= 1000;
177         btcoex->btcoex_no_stomp =  btcoex->btcoex_period *
178                                         (100 - btcoex->duty_cycle) / 100;
179
180         ath9k_hw_btcoex_enable(sc->sc_ah);
181         ath9k_btcoex_timer_resume(sc);
182 }
183
184 void ath_mci_process_profile(struct ath_softc *sc,
185                              struct ath_mci_profile_info *info)
186 {
187         struct ath_common *common = ath9k_hw_common(sc->sc_ah);
188         struct ath_btcoex *btcoex = &sc->btcoex;
189         struct ath_mci_profile *mci = &btcoex->mci;
190
191         if (info->start) {
192                 if (!ath_mci_add_profile(common, mci, info))
193                         return;
194         } else
195                 ath_mci_del_profile(common, mci, info);
196
197         btcoex->btcoex_period = ATH_MCI_DEF_BT_PERIOD;
198         mci->aggr_limit = mci->num_sco ? 6 : 0;
199         if (NUM_PROF(mci)) {
200                 btcoex->bt_stomp_type = ATH_BTCOEX_STOMP_LOW;
201                 btcoex->duty_cycle = ath_mci_duty_cycle[NUM_PROF(mci)];
202         } else {
203                 btcoex->bt_stomp_type = mci->num_mgmt ? ATH_BTCOEX_STOMP_ALL :
204                                                         ATH_BTCOEX_STOMP_LOW;
205                 btcoex->duty_cycle = ATH_BTCOEX_DEF_DUTY_CYCLE;
206         }
207
208         ath_mci_update_scheme(sc);
209 }
210
211 void ath_mci_process_status(struct ath_softc *sc,
212                             struct ath_mci_profile_status *status)
213 {
214         struct ath_common *common = ath9k_hw_common(sc->sc_ah);
215         struct ath_btcoex *btcoex = &sc->btcoex;
216         struct ath_mci_profile *mci = &btcoex->mci;
217         struct ath_mci_profile_info info;
218         int i = 0, old_num_mgmt = mci->num_mgmt;
219
220         /* Link status type are not handled */
221         if (status->is_link) {
222                 ath_dbg(common, ATH_DBG_MCI,
223                         "Skip link type status update\n");
224                 return;
225         }
226
227         memset(&info, 0, sizeof(struct ath_mci_profile_info));
228
229         info.conn_handle = status->conn_handle;
230         if (ath_mci_find_profile(mci, &info)) {
231                 ath_dbg(common, ATH_DBG_MCI,
232                         "Skip non link state update for existing profile %d\n",
233                         status->conn_handle);
234                 return;
235         }
236         if (status->conn_handle >= ATH_MCI_MAX_PROFILE) {
237                 ath_dbg(common, ATH_DBG_MCI,
238                         "Ignore too many non-link update\n");
239                 return;
240         }
241         if (status->is_critical)
242                 __set_bit(status->conn_handle, mci->status);
243         else
244                 __clear_bit(status->conn_handle, mci->status);
245
246         mci->num_mgmt = 0;
247         do {
248                 if (test_bit(i, mci->status))
249                         mci->num_mgmt++;
250         } while (++i < ATH_MCI_MAX_PROFILE);
251
252         if (old_num_mgmt != mci->num_mgmt)
253                 ath_mci_update_scheme(sc);
254 }