drivers/net/wireless/ath/ath9k/btcoex.c

   1 /*
   2  * Copyright (c) 2009 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
  19 static const struct ath_btcoex_config ath_bt_config = { 0, true, true,
  20                         ATH_BT_COEX_MODE_SLOTTED, true, true, 2, 5, true };
  21
  22 static const u16 ath_subsysid_tbl[] = {
  23         AR9280_COEX2WIRE_SUBSYSID,
  24         AT9285_COEX3WIRE_SA_SUBSYSID,
  25         AT9285_COEX3WIRE_DA_SUBSYSID
  26 };
  27
  28 /*
  29  * Checks the subsystem id of the device to see if it
  30  * supports btcoex
  31  */
  32 bool ath_btcoex_supported(u16 subsysid)
  33 {
  34         int i;
  35
  36         if (!subsysid)
  37                 return false;
  38
  39         for (i = 0; i < ARRAY_SIZE(ath_subsysid_tbl); i++)
  40                 if (subsysid == ath_subsysid_tbl[i])
  41                         return true;
  42
  43         return false;
  44 }
  45
  46 /*
  47  * Detects if there is any priority bt traffic
  48  */
  49 static void ath_detect_bt_priority(struct ath_softc *sc)
  50 {
  51         struct ath_btcoex_info *btinfo = &sc->btcoex_info;
  52
  53         if (ath9k_hw_gpio_get(sc->sc_ah, btinfo->btpriority_gpio))
  54                 btinfo->bt_priority_cnt++;
  55
  56         if (time_after(jiffies, btinfo->bt_priority_time +
  57                         msecs_to_jiffies(ATH_BT_PRIORITY_TIME_THRESHOLD))) {
  58                 if (btinfo->bt_priority_cnt >= ATH_BT_CNT_THRESHOLD) {
  59                         DPRINTF(sc, ATH_DBG_BTCOEX,
  60                                 "BT priority traffic detected");
  61                         sc->sc_flags |= SC_OP_BT_PRIORITY_DETECTED;
  62                 } else {
  63                         sc->sc_flags &= ~SC_OP_BT_PRIORITY_DETECTED;
  64                 }
  65
  66                 btinfo->bt_priority_cnt = 0;
  67                 btinfo->bt_priority_time = jiffies;
  68         }
  69 }
  70
  71 /*
  72  * Configures appropriate weight based on stomp type.
  73  */
  74 static void ath_btcoex_bt_stomp(struct ath_softc *sc,
  75                                 struct ath_btcoex_info *btinfo,
  76                                 int stomp_type)
  77 {
  78
  79         switch (stomp_type) {
  80         case ATH_BTCOEX_STOMP_ALL:
  81                 ath_btcoex_set_weight(btinfo, AR_BT_COEX_WGHT,
  82                                       AR_STOMP_ALL_WLAN_WGHT);
  83                 break;
  84         case ATH_BTCOEX_STOMP_LOW:
  85                 ath_btcoex_set_weight(btinfo, AR_BT_COEX_WGHT,
  86                                       AR_STOMP_LOW_WLAN_WGHT);
  87                 break;
  88         case ATH_BTCOEX_STOMP_NONE:
  89                 ath_btcoex_set_weight(btinfo, AR_BT_COEX_WGHT,
  90                                       AR_STOMP_NONE_WLAN_WGHT);
  91                 break;
  92         default:
  93                 DPRINTF(sc, ATH_DBG_BTCOEX, "Invalid Stomptype\n");
  94                 break;
  95         }
  96
  97         ath9k_hw_btcoex_enable(sc->sc_ah);
  98 }
  99
 100 /*
 101  * This is the master bt coex timer which runs for every
 102  * 45ms, bt traffic will be given priority during 55% of this
 103  * period while wlan gets remaining 45%
 104  */
 105
 106 static void ath_btcoex_period_timer(unsigned long data)
 107 {
 108         struct ath_softc *sc = (struct ath_softc *) data;
 109         struct ath_btcoex_info *btinfo = &sc->btcoex_info;
 110
 111         ath_detect_bt_priority(sc);
 112
 113         spin_lock_bh(&btinfo->btcoex_lock);
 114
 115         ath_btcoex_bt_stomp(sc, btinfo, btinfo->bt_stomp_type);
 116
 117         spin_unlock_bh(&btinfo->btcoex_lock);
 118
 119         if (btinfo->btcoex_period != btinfo->btcoex_no_stomp) {
 120                 if (btinfo->hw_timer_enabled)
 121                         ath_gen_timer_stop(sc->sc_ah, btinfo->no_stomp_timer);
 122
 123                 ath_gen_timer_start(sc->sc_ah,
 124                         btinfo->no_stomp_timer,
 125                         (ath9k_hw_gettsf32(sc->sc_ah) +
 126                                 btinfo->btcoex_no_stomp),
 127                                 btinfo->btcoex_no_stomp * 10);
 128                 btinfo->hw_timer_enabled = true;
 129         }
 130
 131         mod_timer(&btinfo->period_timer, jiffies +
 132                                   msecs_to_jiffies(ATH_BTCOEX_DEF_BT_PERIOD));
 133 }
 134
 135 /*
 136  * Generic tsf based hw timer which configures weight
 137  * registers to time slice between wlan and bt traffic
 138  */
 139
 140 static void ath_btcoex_no_stomp_timer(void *arg)
 141 {
 142         struct ath_softc *sc = (struct ath_softc *)arg;
 143         struct ath_btcoex_info *btinfo = &sc->btcoex_info;
 144
 145         DPRINTF(sc, ATH_DBG_BTCOEX, "no stomp timer running \n");
 146
 147         spin_lock_bh(&btinfo->btcoex_lock);
 148
 149         if (btinfo->bt_stomp_type == ATH_BTCOEX_STOMP_LOW)
 150                 ath_btcoex_bt_stomp(sc, btinfo, ATH_BTCOEX_STOMP_NONE);
 151          else if (btinfo->bt_stomp_type == ATH_BTCOEX_STOMP_ALL)
 152                 ath_btcoex_bt_stomp(sc, btinfo, ATH_BTCOEX_STOMP_LOW);
 153
 154         spin_unlock_bh(&btinfo->btcoex_lock);
 155 }
 156
 157 static int ath_init_btcoex_info(struct ath_hw *hw,
 158                                 struct ath_btcoex_info *btcoex_info)
 159 {
 160         u32 i;
 161         int qnum;
 162
 163         qnum = ath_tx_get_qnum(hw->ah_sc, ATH9K_TX_QUEUE_DATA, ATH9K_WME_AC_BE);
 164
 165         btcoex_info->bt_coex_mode =
 166                 (btcoex_info->bt_coex_mode & AR_BT_QCU_THRESH) |
 167                 SM(ath_bt_config.bt_time_extend, AR_BT_TIME_EXTEND) |
 168                 SM(ath_bt_config.bt_txstate_extend, AR_BT_TXSTATE_EXTEND) |
 169                 SM(ath_bt_config.bt_txframe_extend, AR_BT_TX_FRAME_EXTEND) |
 170                 SM(ath_bt_config.bt_mode, AR_BT_MODE) |
 171                 SM(ath_bt_config.bt_quiet_collision, AR_BT_QUIET) |
 172                 SM(ath_bt_config.bt_rxclear_polarity, AR_BT_RX_CLEAR_POLARITY) |
 173                 SM(ath_bt_config.bt_priority_time, AR_BT_PRIORITY_TIME) |
 174                 SM(ath_bt_config.bt_first_slot_time, AR_BT_FIRST_SLOT_TIME) |
 175                 SM(qnum, AR_BT_QCU_THRESH);
 176
 177         btcoex_info->bt_coex_mode2 =
 178                 SM(ath_bt_config.bt_hold_rx_clear, AR_BT_HOLD_RX_CLEAR) |
 179                 SM(ATH_BTCOEX_BMISS_THRESH, AR_BT_BCN_MISS_THRESH) |
 180                 AR_BT_DISABLE_BT_ANT;
 181
 182         btcoex_info->bt_stomp_type = ATH_BTCOEX_STOMP_LOW;
 183
 184         btcoex_info->btcoex_period = ATH_BTCOEX_DEF_BT_PERIOD * 1000;
 185
 186         btcoex_info->btcoex_no_stomp = (100 - ATH_BTCOEX_DEF_DUTY_CYCLE) *
 187                 btcoex_info->btcoex_period / 100;
 188
 189         for (i = 0; i < 32; i++)
 190                 hw->hw_gen_timers.gen_timer_index[(debruijn32 << i) >> 27] = i;
 191
 192         setup_timer(&btcoex_info->period_timer, ath_btcoex_period_timer,
 193                         (unsigned long) hw->ah_sc);
 194
 195         btcoex_info->no_stomp_timer = ath_gen_timer_alloc(hw,
 196                         ath_btcoex_no_stomp_timer,
 197                         ath_btcoex_no_stomp_timer,
 198                         (void *)hw->ah_sc, AR_FIRST_NDP_TIMER);
 199
 200         if (btcoex_info->no_stomp_timer == NULL)
 201                 return -ENOMEM;
 202
 203         spin_lock_init(&btcoex_info->btcoex_lock);
 204
 205         return 0;
 206 }
 207
 208 int ath9k_hw_btcoex_init(struct ath_hw *ah)
 209 {
 210         struct ath_btcoex_info *btcoex_info = &ah->ah_sc->btcoex_info;
 211         int ret = 0;
 212
 213         if (btcoex_info->btcoex_scheme == ATH_BTCOEX_CFG_2WIRE) {
 214                 /* connect bt_active to baseband */
 215                 REG_CLR_BIT(ah, AR_GPIO_INPUT_EN_VAL,
 216                                 (AR_GPIO_INPUT_EN_VAL_BT_PRIORITY_DEF |
 217                                  AR_GPIO_INPUT_EN_VAL_BT_FREQUENCY_DEF));
 218
 219                 REG_SET_BIT(ah, AR_GPIO_INPUT_EN_VAL,
 220                                 AR_GPIO_INPUT_EN_VAL_BT_ACTIVE_BB);
 221
 222                 /* Set input mux for bt_active to gpio pin */
 223                 REG_RMW_FIELD(ah, AR_GPIO_INPUT_MUX1,
 224                                 AR_GPIO_INPUT_MUX1_BT_ACTIVE,
 225                                 btcoex_info->btactive_gpio);
 226
 227                 /* Configure the desired gpio port for input */
 228                 ath9k_hw_cfg_gpio_input(ah, btcoex_info->btactive_gpio);
 229         } else {
 230                 /* btcoex 3-wire */
 231                 REG_SET_BIT(ah, AR_GPIO_INPUT_EN_VAL,
 232                                 (AR_GPIO_INPUT_EN_VAL_BT_PRIORITY_BB |
 233                                  AR_GPIO_INPUT_EN_VAL_BT_ACTIVE_BB));
 234
 235                 /* Set input mux for bt_prority_async and
 236                  *                  bt_active_async to GPIO pins */
 237                 REG_RMW_FIELD(ah, AR_GPIO_INPUT_MUX1,
 238                                 AR_GPIO_INPUT_MUX1_BT_ACTIVE,
 239                                 btcoex_info->btactive_gpio);
 240
 241                 REG_RMW_FIELD(ah, AR_GPIO_INPUT_MUX1,
 242                                 AR_GPIO_INPUT_MUX1_BT_PRIORITY,
 243                                 btcoex_info->btpriority_gpio);
 244
 245                 /* Configure the desired GPIO ports for input */
 246
 247                 ath9k_hw_cfg_gpio_input(ah, btcoex_info->btactive_gpio);
 248                 ath9k_hw_cfg_gpio_input(ah, btcoex_info->btpriority_gpio);
 249
 250                 ret = ath_init_btcoex_info(ah, btcoex_info);
 251         }
 252
 253         return ret;
 254 }
 255
 256 void ath9k_hw_btcoex_enable(struct ath_hw *ah)
 257 {
 258         struct ath_btcoex_info *btcoex_info = &ah->ah_sc->btcoex_info;
 259
 260         if (btcoex_info->btcoex_scheme == ATH_BTCOEX_CFG_2WIRE) {
 261                 /* Configure the desired GPIO port for TX_FRAME output */
 262                 ath9k_hw_cfg_output(ah, btcoex_info->wlanactive_gpio,
 263                                 AR_GPIO_OUTPUT_MUX_AS_TX_FRAME);
 264         } else {
 265                 /*
 266                  * Program coex mode and weight registers to
 267                  * enable coex 3-wire
 268                  */
 269                 REG_WRITE(ah, AR_BT_COEX_MODE, btcoex_info->bt_coex_mode);
 270                 REG_WRITE(ah, AR_BT_COEX_WEIGHT, btcoex_info->bt_coex_weights);
 271                 REG_WRITE(ah, AR_BT_COEX_MODE2, btcoex_info->bt_coex_mode2);
 272
 273                 REG_RMW_FIELD(ah, AR_QUIET1,
 274                                 AR_QUIET1_QUIET_ACK_CTS_ENABLE, 1);
 275                 REG_RMW_FIELD(ah, AR_PCU_MISC,
 276                                 AR_PCU_BT_ANT_PREVENT_RX, 0);
 277
 278                 ath9k_hw_cfg_output(ah, btcoex_info->wlanactive_gpio,
 279                                 AR_GPIO_OUTPUT_MUX_AS_RX_CLEAR_EXTERNAL);
 280         }
 281
 282         REG_RMW(ah, AR_GPIO_PDPU,
 283                 (0x2 << (btcoex_info->btactive_gpio * 2)),
 284                 (0x3 << (btcoex_info->btactive_gpio * 2)));
 285
 286         ah->ah_sc->sc_flags |= SC_OP_BTCOEX_ENABLED;
 287 }
 288
 289 void ath9k_hw_btcoex_disable(struct ath_hw *ah)
 290 {
 291         struct ath_btcoex_info *btcoex_info = &ah->ah_sc->btcoex_info;
 292
 293         ath9k_hw_set_gpio(ah, btcoex_info->wlanactive_gpio, 0);
 294
 295         ath9k_hw_cfg_output(ah, btcoex_info->wlanactive_gpio,
 296                         AR_GPIO_OUTPUT_MUX_AS_OUTPUT);
 297
 298         if (btcoex_info->btcoex_scheme == ATH_BTCOEX_CFG_3WIRE) {
 299                 REG_WRITE(ah, AR_BT_COEX_MODE, AR_BT_QUIET | AR_BT_MODE);
 300                 REG_WRITE(ah, AR_BT_COEX_WEIGHT, 0);
 301                 REG_WRITE(ah, AR_BT_COEX_MODE2, 0);
 302         }
 303
 304         ah->ah_sc->sc_flags &= ~SC_OP_BTCOEX_ENABLED;
 305 }
 306
 307 /*
 308  * Pause btcoex timer and bt duty cycle timer
 309  */
 310 void ath_btcoex_timer_pause(struct ath_softc *sc,
 311                             struct ath_btcoex_info *btinfo)
 312 {
 313
 314         del_timer_sync(&btinfo->period_timer);
 315
 316         if (btinfo->hw_timer_enabled)
 317                 ath_gen_timer_stop(sc->sc_ah, btinfo->no_stomp_timer);
 318
 319         btinfo->hw_timer_enabled = false;
 320 }
 321
 322 /*
 323  * (Re)start btcoex timers
 324  */
 325 void ath_btcoex_timer_resume(struct ath_softc *sc,
 326                              struct ath_btcoex_info *btinfo)
 327 {
 328
 329         DPRINTF(sc, ATH_DBG_BTCOEX, "Starting btcoex timers");
 330
 331         /* make sure duty cycle timer is also stopped when resuming */
 332         if (btinfo->hw_timer_enabled)
 333                 ath_gen_timer_stop(sc->sc_ah, btinfo->no_stomp_timer);
 334
 335         btinfo->bt_priority_cnt = 0;
 336         btinfo->bt_priority_time = jiffies;
 337         sc->sc_flags &= ~SC_OP_BT_PRIORITY_DETECTED;
 338
 339         mod_timer(&btinfo->period_timer, jiffies);
 340 }