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 }