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

   1 /*
   2  * Copyright (c) 2009-2011 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 <linux/export.h>
  18 #include "hw.h"
  19
  20 enum ath_bt_mode {
  21         ATH_BT_COEX_MODE_LEGACY,        /* legacy rx_clear mode */
  22         ATH_BT_COEX_MODE_UNSLOTTED,     /* untimed/unslotted mode */
  23         ATH_BT_COEX_MODE_SLOTTED,       /* slotted mode */
  24         ATH_BT_COEX_MODE_DISABLED,      /* coexistence disabled */
  25 };
  26
  27 struct ath_btcoex_config {
  28         u8 bt_time_extend;
  29         bool bt_txstate_extend;
  30         bool bt_txframe_extend;
  31         enum ath_bt_mode bt_mode; /* coexistence mode */
  32         bool bt_quiet_collision;
  33         bool bt_rxclear_polarity; /* invert rx_clear as WLAN_ACTIVE*/
  34         u8 bt_priority_time;
  35         u8 bt_first_slot_time;
  36         bool bt_hold_rx_clear;
  37 };
  38
  39 static const u32 ar9003_wlan_weights[ATH_BTCOEX_STOMP_MAX]
  40                                     [AR9300_NUM_WLAN_WEIGHTS] = {
  41         { 0xfffffff0, 0xfffffff0, 0xfffffff0, 0xfffffff0 }, /* STOMP_ALL */
  42         { 0x88888880, 0x88888880, 0x88888880, 0x88888880 }, /* STOMP_LOW */
  43         { 0x00000000, 0x00000000, 0x00000000, 0x00000000 }, /* STOMP_NONE */
  44 };
  45
  46 static const u32 ar9462_wlan_weights[ATH_BTCOEX_STOMP_MAX]
  47                                     [AR9300_NUM_WLAN_WEIGHTS] = {
  48         { 0x01017d01, 0x41414101, 0x41414101, 0x41414141 }, /* STOMP_ALL */
  49         { 0x01017d01, 0x3b3b3b01, 0x3b3b3b01, 0x3b3b3b3b }, /* STOMP_LOW */
  50         { 0x01017d01, 0x01010101, 0x01010101, 0x01010101 }, /* STOMP_NONE */
  51         { 0x01017d01, 0x013b0101, 0x3b3b0101, 0x3b3b013b }, /* STOMP_LOW_FTP */
  52 };
  53
  54 void ath9k_hw_init_btcoex_hw(struct ath_hw *ah, int qnum)
  55 {
  56         struct ath_btcoex_hw *btcoex_hw = &ah->btcoex_hw;
  57         const struct ath_btcoex_config ath_bt_config = {
  58                 .bt_time_extend = 0,
  59                 .bt_txstate_extend = true,
  60                 .bt_txframe_extend = true,
  61                 .bt_mode = ATH_BT_COEX_MODE_SLOTTED,
  62                 .bt_quiet_collision = true,
  63                 .bt_rxclear_polarity = true,
  64                 .bt_priority_time = 2,
  65                 .bt_first_slot_time = 5,
  66                 .bt_hold_rx_clear = true,
  67         };
  68         u32 i, idx;
  69         bool rxclear_polarity = ath_bt_config.bt_rxclear_polarity;
  70
  71         if (ath9k_hw_get_btcoex_scheme(ah) == ATH_BTCOEX_CFG_NONE)
  72                 return;
  73
  74         if (AR_SREV_9300_20_OR_LATER(ah))
  75                 rxclear_polarity = !ath_bt_config.bt_rxclear_polarity;
  76
  77         btcoex_hw->bt_coex_mode =
  78                 (btcoex_hw->bt_coex_mode & AR_BT_QCU_THRESH) |
  79                 SM(ath_bt_config.bt_time_extend, AR_BT_TIME_EXTEND) |
  80                 SM(ath_bt_config.bt_txstate_extend, AR_BT_TXSTATE_EXTEND) |
  81                 SM(ath_bt_config.bt_txframe_extend, AR_BT_TX_FRAME_EXTEND) |
  82                 SM(ath_bt_config.bt_mode, AR_BT_MODE) |
  83                 SM(ath_bt_config.bt_quiet_collision, AR_BT_QUIET) |
  84                 SM(rxclear_polarity, AR_BT_RX_CLEAR_POLARITY) |
  85                 SM(ath_bt_config.bt_priority_time, AR_BT_PRIORITY_TIME) |
  86                 SM(ath_bt_config.bt_first_slot_time, AR_BT_FIRST_SLOT_TIME) |
  87                 SM(qnum, AR_BT_QCU_THRESH);
  88
  89         btcoex_hw->bt_coex_mode2 =
  90                 SM(ath_bt_config.bt_hold_rx_clear, AR_BT_HOLD_RX_CLEAR) |
  91                 SM(ATH_BTCOEX_BMISS_THRESH, AR_BT_BCN_MISS_THRESH) |
  92                 AR_BT_DISABLE_BT_ANT;
  93
  94         for (i = 0; i < 32; i++) {
  95                 idx = (debruijn32 << i) >> 27;
  96                 ah->hw_gen_timers.gen_timer_index[idx] = i;
  97         }
  98 }
  99 EXPORT_SYMBOL(ath9k_hw_init_btcoex_hw);
 100
 101 void ath9k_hw_btcoex_init_2wire(struct ath_hw *ah)
 102 {
 103         struct ath_btcoex_hw *btcoex_hw = &ah->btcoex_hw;
 104
 105         if (ath9k_hw_get_btcoex_scheme(ah) == ATH_BTCOEX_CFG_NONE)
 106                 return;
 107
 108         /* connect bt_active to baseband */
 109         REG_CLR_BIT(ah, AR_GPIO_INPUT_EN_VAL,
 110                     (AR_GPIO_INPUT_EN_VAL_BT_PRIORITY_DEF |
 111                      AR_GPIO_INPUT_EN_VAL_BT_FREQUENCY_DEF));
 112
 113         REG_SET_BIT(ah, AR_GPIO_INPUT_EN_VAL,
 114                     AR_GPIO_INPUT_EN_VAL_BT_ACTIVE_BB);
 115
 116         /* Set input mux for bt_active to gpio pin */
 117         REG_RMW_FIELD(ah, AR_GPIO_INPUT_MUX1,
 118                       AR_GPIO_INPUT_MUX1_BT_ACTIVE,
 119                       btcoex_hw->btactive_gpio);
 120
 121         /* Configure the desired gpio port for input */
 122         ath9k_hw_cfg_gpio_input(ah, btcoex_hw->btactive_gpio);
 123 }
 124 EXPORT_SYMBOL(ath9k_hw_btcoex_init_2wire);
 125
 126 void ath9k_hw_btcoex_init_3wire(struct ath_hw *ah)
 127 {
 128         struct ath_btcoex_hw *btcoex_hw = &ah->btcoex_hw;
 129
 130         if (ath9k_hw_get_btcoex_scheme(ah) == ATH_BTCOEX_CFG_NONE)
 131                 return;
 132
 133         /* btcoex 3-wire */
 134         REG_SET_BIT(ah, AR_GPIO_INPUT_EN_VAL,
 135                         (AR_GPIO_INPUT_EN_VAL_BT_PRIORITY_BB |
 136                          AR_GPIO_INPUT_EN_VAL_BT_ACTIVE_BB));
 137
 138         /* Set input mux for bt_prority_async and
 139          *                  bt_active_async to GPIO pins */
 140         REG_RMW_FIELD(ah, AR_GPIO_INPUT_MUX1,
 141                         AR_GPIO_INPUT_MUX1_BT_ACTIVE,
 142                         btcoex_hw->btactive_gpio);
 143
 144         REG_RMW_FIELD(ah, AR_GPIO_INPUT_MUX1,
 145                         AR_GPIO_INPUT_MUX1_BT_PRIORITY,
 146                         btcoex_hw->btpriority_gpio);
 147
 148         /* Configure the desired GPIO ports for input */
 149
 150         ath9k_hw_cfg_gpio_input(ah, btcoex_hw->btactive_gpio);
 151         ath9k_hw_cfg_gpio_input(ah, btcoex_hw->btpriority_gpio);
 152 }
 153 EXPORT_SYMBOL(ath9k_hw_btcoex_init_3wire);
 154
 155 static void ath9k_hw_btcoex_enable_2wire(struct ath_hw *ah)
 156 {
 157         struct ath_btcoex_hw *btcoex_hw = &ah->btcoex_hw;
 158
 159         if (ath9k_hw_get_btcoex_scheme(ah) == ATH_BTCOEX_CFG_NONE)
 160                 return;
 161
 162         /* Configure the desired GPIO port for TX_FRAME output */
 163         ath9k_hw_cfg_output(ah, btcoex_hw->wlanactive_gpio,
 164                             AR_GPIO_OUTPUT_MUX_AS_TX_FRAME);
 165 }
 166
 167 void ath9k_hw_btcoex_set_weight(struct ath_hw *ah,
 168                                 u32 bt_weight,
 169                                 u32 wlan_weight)
 170 {
 171         struct ath_btcoex_hw *btcoex_hw = &ah->btcoex_hw;
 172
 173         if (ath9k_hw_get_btcoex_scheme(ah) == ATH_BTCOEX_CFG_NONE)
 174                 return;
 175
 176         btcoex_hw->bt_coex_weights = SM(bt_weight, AR_BTCOEX_BT_WGHT) |
 177                                      SM(wlan_weight, AR_BTCOEX_WL_WGHT);
 178 }
 179 EXPORT_SYMBOL(ath9k_hw_btcoex_set_weight);
 180
 181
 182 static void ath9k_hw_btcoex_enable_3wire(struct ath_hw *ah)
 183 {
 184         struct ath_btcoex_hw *btcoex = &ah->btcoex_hw;
 185         u32  val;
 186         int i;
 187
 188         /*
 189          * Program coex mode and weight registers to
 190          * enable coex 3-wire
 191          */
 192         REG_WRITE(ah, AR_BT_COEX_MODE, btcoex->bt_coex_mode);
 193         REG_WRITE(ah, AR_BT_COEX_MODE2, btcoex->bt_coex_mode2);
 194
 195
 196         if (AR_SREV_9300_20_OR_LATER(ah)) {
 197                 REG_WRITE(ah, AR_BT_COEX_WL_WEIGHTS0, btcoex->wlan_weight[0]);
 198                 REG_WRITE(ah, AR_BT_COEX_WL_WEIGHTS1, btcoex->wlan_weight[1]);
 199                 for (i = 0; i < AR9300_NUM_BT_WEIGHTS; i++)
 200                         REG_WRITE(ah, AR_BT_COEX_BT_WEIGHTS(i),
 201                                   btcoex->bt_weight[i]);
 202         } else
 203                 REG_WRITE(ah, AR_BT_COEX_WEIGHT, btcoex->bt_coex_weights);
 204
 205
 206
 207         if (AR_SREV_9271(ah)) {
 208                 val = REG_READ(ah, 0x50040);
 209                 val &= 0xFFFFFEFF;
 210                 REG_WRITE(ah, 0x50040, val);
 211         }
 212
 213         REG_RMW_FIELD(ah, AR_QUIET1, AR_QUIET1_QUIET_ACK_CTS_ENABLE, 1);
 214         REG_RMW_FIELD(ah, AR_PCU_MISC, AR_PCU_BT_ANT_PREVENT_RX, 0);
 215
 216         ath9k_hw_cfg_output(ah, btcoex->wlanactive_gpio,
 217                             AR_GPIO_OUTPUT_MUX_AS_RX_CLEAR_EXTERNAL);
 218 }
 219
 220 static void ath9k_hw_btcoex_enable_mci(struct ath_hw *ah)
 221 {
 222         struct ath_btcoex_hw *btcoex = &ah->btcoex_hw;
 223         int i;
 224
 225         for (i = 0; i < AR9300_NUM_BT_WEIGHTS; i++)
 226                 REG_WRITE(ah, AR_MCI_COEX_WL_WEIGHTS(i),
 227                           btcoex->wlan_weight[i]);
 228
 229         REG_RMW_FIELD(ah, AR_QUIET1, AR_QUIET1_QUIET_ACK_CTS_ENABLE, 1);
 230         btcoex->enabled = true;
 231 }
 232
 233 void ath9k_hw_btcoex_enable(struct ath_hw *ah)
 234 {
 235         struct ath_btcoex_hw *btcoex_hw = &ah->btcoex_hw;
 236
 237         switch (ath9k_hw_get_btcoex_scheme(ah)) {
 238         case ATH_BTCOEX_CFG_NONE:
 239                 return;
 240         case ATH_BTCOEX_CFG_2WIRE:
 241                 ath9k_hw_btcoex_enable_2wire(ah);
 242                 break;
 243         case ATH_BTCOEX_CFG_3WIRE:
 244                 ath9k_hw_btcoex_enable_3wire(ah);
 245                 break;
 246         case ATH_BTCOEX_CFG_MCI:
 247                 ath9k_hw_btcoex_enable_mci(ah);
 248                 return;
 249         }
 250
 251         REG_RMW(ah, AR_GPIO_PDPU,
 252                 (0x2 << (btcoex_hw->btactive_gpio * 2)),
 253                 (0x3 << (btcoex_hw->btactive_gpio * 2)));
 254
 255         ah->btcoex_hw.enabled = true;
 256 }
 257 EXPORT_SYMBOL(ath9k_hw_btcoex_enable);
 258
 259 void ath9k_hw_btcoex_disable(struct ath_hw *ah)
 260 {
 261         struct ath_btcoex_hw *btcoex_hw = &ah->btcoex_hw;
 262         int i;
 263
 264         if (ath9k_hw_get_btcoex_scheme(ah) == ATH_BTCOEX_CFG_NONE)
 265                 return;
 266
 267         btcoex_hw->enabled = false;
 268         if (btcoex_hw->scheme == ATH_BTCOEX_CFG_MCI) {
 269                 ath9k_hw_btcoex_bt_stomp(ah, ATH_BTCOEX_STOMP_NONE);
 270                 for (i = 0; i < AR9300_NUM_BT_WEIGHTS; i++)
 271                         REG_WRITE(ah, AR_MCI_COEX_WL_WEIGHTS(i),
 272                                   btcoex_hw->wlan_weight[i]);
 273         }
 274         ath9k_hw_set_gpio(ah, btcoex_hw->wlanactive_gpio, 0);
 275
 276         ath9k_hw_cfg_output(ah, btcoex_hw->wlanactive_gpio,
 277                         AR_GPIO_OUTPUT_MUX_AS_OUTPUT);
 278
 279         if (btcoex_hw->scheme == ATH_BTCOEX_CFG_3WIRE) {
 280                 REG_WRITE(ah, AR_BT_COEX_MODE, AR_BT_QUIET | AR_BT_MODE);
 281                 REG_WRITE(ah, AR_BT_COEX_MODE2, 0);
 282
 283                 if (AR_SREV_9300_20_OR_LATER(ah)) {
 284                         REG_WRITE(ah, AR_BT_COEX_WL_WEIGHTS0, 0);
 285                         REG_WRITE(ah, AR_BT_COEX_WL_WEIGHTS1, 0);
 286                         for (i = 0; i < AR9300_NUM_BT_WEIGHTS; i++)
 287                                 REG_WRITE(ah, AR_BT_COEX_BT_WEIGHTS(i), 0);
 288                 } else
 289                         REG_WRITE(ah, AR_BT_COEX_WEIGHT, 0);
 290
 291         }
 292 }
 293 EXPORT_SYMBOL(ath9k_hw_btcoex_disable);
 294
 295 static void ar9003_btcoex_bt_stomp(struct ath_hw *ah,
 296                          enum ath_stomp_type stomp_type)
 297 {
 298         struct ath_btcoex_hw *btcoex = &ah->btcoex_hw;
 299         const u32 *weight = AR_SREV_9462(ah) ? ar9003_wlan_weights[stomp_type] :
 300                                                ar9462_wlan_weights[stomp_type];
 301         int i;
 302
 303         for (i = 0; i < AR9300_NUM_WLAN_WEIGHTS; i++) {
 304                 btcoex->bt_weight[i] = AR9300_BT_WGHT;
 305                 btcoex->wlan_weight[i] = weight[i];
 306         }
 307 }
 308
 309 /*
 310  * Configures appropriate weight based on stomp type.
 311  */
 312 void ath9k_hw_btcoex_bt_stomp(struct ath_hw *ah,
 313                               enum ath_stomp_type stomp_type)
 314 {
 315         if (ath9k_hw_get_btcoex_scheme(ah) == ATH_BTCOEX_CFG_NONE)
 316                 return;
 317
 318         if (AR_SREV_9300_20_OR_LATER(ah)) {
 319                 ar9003_btcoex_bt_stomp(ah, stomp_type);
 320                 return;
 321         }
 322
 323         switch (stomp_type) {
 324         case ATH_BTCOEX_STOMP_ALL:
 325                 ath9k_hw_btcoex_set_weight(ah, AR_BT_COEX_WGHT,
 326                                 AR_STOMP_ALL_WLAN_WGHT);
 327                 break;
 328         case ATH_BTCOEX_STOMP_LOW:
 329                 ath9k_hw_btcoex_set_weight(ah, AR_BT_COEX_WGHT,
 330                                 AR_STOMP_LOW_WLAN_WGHT);
 331                 break;
 332         case ATH_BTCOEX_STOMP_NONE:
 333                 ath9k_hw_btcoex_set_weight(ah, AR_BT_COEX_WGHT,
 334                                 AR_STOMP_NONE_WLAN_WGHT);
 335                 break;
 336         default:
 337                 ath_dbg(ath9k_hw_common(ah), BTCOEX, "Invalid Stomptype\n");
 338                 break;
 339         }
 340 }
 341 EXPORT_SYMBOL(ath9k_hw_btcoex_bt_stomp);