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 (AR_SREV_9300_20_OR_LATER(ah))
  72                 rxclear_polarity = !ath_bt_config.bt_rxclear_polarity;
  73
  74         btcoex_hw->bt_coex_mode =
  75                 (btcoex_hw->bt_coex_mode & AR_BT_QCU_THRESH) |
  76                 SM(ath_bt_config.bt_time_extend, AR_BT_TIME_EXTEND) |
  77                 SM(ath_bt_config.bt_txstate_extend, AR_BT_TXSTATE_EXTEND) |
  78                 SM(ath_bt_config.bt_txframe_extend, AR_BT_TX_FRAME_EXTEND) |
  79                 SM(ath_bt_config.bt_mode, AR_BT_MODE) |
  80                 SM(ath_bt_config.bt_quiet_collision, AR_BT_QUIET) |
  81                 SM(rxclear_polarity, AR_BT_RX_CLEAR_POLARITY) |
  82                 SM(ath_bt_config.bt_priority_time, AR_BT_PRIORITY_TIME) |
  83                 SM(ath_bt_config.bt_first_slot_time, AR_BT_FIRST_SLOT_TIME) |
  84                 SM(qnum, AR_BT_QCU_THRESH);
  85
  86         btcoex_hw->bt_coex_mode2 =
  87                 SM(ath_bt_config.bt_hold_rx_clear, AR_BT_HOLD_RX_CLEAR) |
  88                 SM(ATH_BTCOEX_BMISS_THRESH, AR_BT_BCN_MISS_THRESH) |
  89                 AR_BT_DISABLE_BT_ANT;
  90
  91         for (i = 0; i < 32; i++) {
  92                 idx = (debruijn32 << i) >> 27;
  93                 ah->hw_gen_timers.gen_timer_index[idx] = i;
  94         }
  95 }
  96 EXPORT_SYMBOL(ath9k_hw_init_btcoex_hw);
  97
  98 void ath9k_hw_btcoex_init_2wire(struct ath_hw *ah)
  99 {
 100         struct ath_btcoex_hw *btcoex_hw = &ah->btcoex_hw;
 101
 102         /* connect bt_active to baseband */
 103         REG_CLR_BIT(ah, AR_GPIO_INPUT_EN_VAL,
 104                     (AR_GPIO_INPUT_EN_VAL_BT_PRIORITY_DEF |
 105                      AR_GPIO_INPUT_EN_VAL_BT_FREQUENCY_DEF));
 106
 107         REG_SET_BIT(ah, AR_GPIO_INPUT_EN_VAL,
 108                     AR_GPIO_INPUT_EN_VAL_BT_ACTIVE_BB);
 109
 110         /* Set input mux for bt_active to gpio pin */
 111         REG_RMW_FIELD(ah, AR_GPIO_INPUT_MUX1,
 112                       AR_GPIO_INPUT_MUX1_BT_ACTIVE,
 113                       btcoex_hw->btactive_gpio);
 114
 115         /* Configure the desired gpio port for input */
 116         ath9k_hw_cfg_gpio_input(ah, btcoex_hw->btactive_gpio);
 117 }
 118 EXPORT_SYMBOL(ath9k_hw_btcoex_init_2wire);
 119
 120 void ath9k_hw_btcoex_init_3wire(struct ath_hw *ah)
 121 {
 122         struct ath_btcoex_hw *btcoex_hw = &ah->btcoex_hw;
 123
 124         /* btcoex 3-wire */
 125         REG_SET_BIT(ah, AR_GPIO_INPUT_EN_VAL,
 126                         (AR_GPIO_INPUT_EN_VAL_BT_PRIORITY_BB |
 127                          AR_GPIO_INPUT_EN_VAL_BT_ACTIVE_BB));
 128
 129         /* Set input mux for bt_prority_async and
 130          *                  bt_active_async to GPIO pins */
 131         REG_RMW_FIELD(ah, AR_GPIO_INPUT_MUX1,
 132                         AR_GPIO_INPUT_MUX1_BT_ACTIVE,
 133                         btcoex_hw->btactive_gpio);
 134
 135         REG_RMW_FIELD(ah, AR_GPIO_INPUT_MUX1,
 136                         AR_GPIO_INPUT_MUX1_BT_PRIORITY,
 137                         btcoex_hw->btpriority_gpio);
 138
 139         /* Configure the desired GPIO ports for input */
 140
 141         ath9k_hw_cfg_gpio_input(ah, btcoex_hw->btactive_gpio);
 142         ath9k_hw_cfg_gpio_input(ah, btcoex_hw->btpriority_gpio);
 143 }
 144 EXPORT_SYMBOL(ath9k_hw_btcoex_init_3wire);
 145
 146 static void ath9k_hw_btcoex_enable_2wire(struct ath_hw *ah)
 147 {
 148         struct ath_btcoex_hw *btcoex_hw = &ah->btcoex_hw;
 149
 150         /* Configure the desired GPIO port for TX_FRAME output */
 151         ath9k_hw_cfg_output(ah, btcoex_hw->wlanactive_gpio,
 152                             AR_GPIO_OUTPUT_MUX_AS_TX_FRAME);
 153 }
 154
 155 void ath9k_hw_btcoex_set_weight(struct ath_hw *ah,
 156                                 u32 bt_weight,
 157                                 u32 wlan_weight)
 158 {
 159         struct ath_btcoex_hw *btcoex_hw = &ah->btcoex_hw;
 160
 161         btcoex_hw->bt_coex_weights = SM(bt_weight, AR_BTCOEX_BT_WGHT) |
 162                                      SM(wlan_weight, AR_BTCOEX_WL_WGHT);
 163 }
 164 EXPORT_SYMBOL(ath9k_hw_btcoex_set_weight);
 165
 166
 167 static void ath9k_hw_btcoex_enable_3wire(struct ath_hw *ah)
 168 {
 169         struct ath_btcoex_hw *btcoex = &ah->btcoex_hw;
 170         u32  val;
 171         int i;
 172
 173         /*
 174          * Program coex mode and weight registers to
 175          * enable coex 3-wire
 176          */
 177         REG_WRITE(ah, AR_BT_COEX_MODE, btcoex->bt_coex_mode);
 178         REG_WRITE(ah, AR_BT_COEX_MODE2, btcoex->bt_coex_mode2);
 179
 180
 181         if (AR_SREV_9300_20_OR_LATER(ah)) {
 182                 REG_WRITE(ah, AR_BT_COEX_WL_WEIGHTS0, btcoex->wlan_weight[0]);
 183                 REG_WRITE(ah, AR_BT_COEX_WL_WEIGHTS1, btcoex->wlan_weight[1]);
 184                 for (i = 0; i < AR9300_NUM_BT_WEIGHTS; i++)
 185                         REG_WRITE(ah, AR_BT_COEX_BT_WEIGHTS(i),
 186                                   btcoex->bt_weight[i]);
 187         } else
 188                 REG_WRITE(ah, AR_BT_COEX_WEIGHT, btcoex->bt_coex_weights);
 189
 190
 191
 192         if (AR_SREV_9271(ah)) {
 193                 val = REG_READ(ah, 0x50040);
 194                 val &= 0xFFFFFEFF;
 195                 REG_WRITE(ah, 0x50040, val);
 196         }
 197
 198         REG_RMW_FIELD(ah, AR_QUIET1, AR_QUIET1_QUIET_ACK_CTS_ENABLE, 1);
 199         REG_RMW_FIELD(ah, AR_PCU_MISC, AR_PCU_BT_ANT_PREVENT_RX, 0);
 200
 201         ath9k_hw_cfg_output(ah, btcoex->wlanactive_gpio,
 202                             AR_GPIO_OUTPUT_MUX_AS_RX_CLEAR_EXTERNAL);
 203 }
 204
 205 static void ath9k_hw_btcoex_enable_mci(struct ath_hw *ah)
 206 {
 207         struct ath_btcoex_hw *btcoex = &ah->btcoex_hw;
 208         int i;
 209
 210         for (i = 0; i < AR9300_NUM_BT_WEIGHTS; i++)
 211                 REG_WRITE(ah, AR_MCI_COEX_WL_WEIGHTS(i),
 212                           btcoex->wlan_weight[i]);
 213
 214         REG_RMW_FIELD(ah, AR_QUIET1, AR_QUIET1_QUIET_ACK_CTS_ENABLE, 1);
 215         btcoex->enabled = true;
 216 }
 217
 218 void ath9k_hw_btcoex_enable(struct ath_hw *ah)
 219 {
 220         struct ath_btcoex_hw *btcoex_hw = &ah->btcoex_hw;
 221
 222         switch (btcoex_hw->scheme) {
 223         case ATH_BTCOEX_CFG_NONE:
 224                 break;
 225         case ATH_BTCOEX_CFG_2WIRE:
 226                 ath9k_hw_btcoex_enable_2wire(ah);
 227                 break;
 228         case ATH_BTCOEX_CFG_3WIRE:
 229                 ath9k_hw_btcoex_enable_3wire(ah);
 230                 break;
 231         case ATH_BTCOEX_CFG_MCI:
 232                 ath9k_hw_btcoex_enable_mci(ah);
 233                 return;
 234         }
 235
 236         REG_RMW(ah, AR_GPIO_PDPU,
 237                 (0x2 << (btcoex_hw->btactive_gpio * 2)),
 238                 (0x3 << (btcoex_hw->btactive_gpio * 2)));
 239
 240         ah->btcoex_hw.enabled = true;
 241 }
 242 EXPORT_SYMBOL(ath9k_hw_btcoex_enable);
 243
 244 void ath9k_hw_btcoex_disable(struct ath_hw *ah)
 245 {
 246         struct ath_btcoex_hw *btcoex_hw = &ah->btcoex_hw;
 247         int i;
 248
 249         btcoex_hw->enabled = false;
 250         if (btcoex_hw->scheme == ATH_BTCOEX_CFG_MCI) {
 251                 ath9k_hw_btcoex_bt_stomp(ah, ATH_BTCOEX_STOMP_NONE);
 252                 for (i = 0; i < AR9300_NUM_BT_WEIGHTS; i++)
 253                         REG_WRITE(ah, AR_MCI_COEX_WL_WEIGHTS(i),
 254                                   btcoex_hw->wlan_weight[i]);
 255         }
 256         ath9k_hw_set_gpio(ah, btcoex_hw->wlanactive_gpio, 0);
 257
 258         ath9k_hw_cfg_output(ah, btcoex_hw->wlanactive_gpio,
 259                         AR_GPIO_OUTPUT_MUX_AS_OUTPUT);
 260
 261         if (btcoex_hw->scheme == ATH_BTCOEX_CFG_3WIRE) {
 262                 REG_WRITE(ah, AR_BT_COEX_MODE, AR_BT_QUIET | AR_BT_MODE);
 263                 REG_WRITE(ah, AR_BT_COEX_MODE2, 0);
 264
 265                 if (AR_SREV_9300_20_OR_LATER(ah)) {
 266                         REG_WRITE(ah, AR_BT_COEX_WL_WEIGHTS0, 0);
 267                         REG_WRITE(ah, AR_BT_COEX_WL_WEIGHTS1, 0);
 268                         for (i = 0; i < AR9300_NUM_BT_WEIGHTS; i++)
 269                                 REG_WRITE(ah, AR_BT_COEX_BT_WEIGHTS(i), 0);
 270                 } else
 271                         REG_WRITE(ah, AR_BT_COEX_WEIGHT, 0);
 272
 273         }
 274 }
 275 EXPORT_SYMBOL(ath9k_hw_btcoex_disable);
 276
 277 static void ar9003_btcoex_bt_stomp(struct ath_hw *ah,
 278                          enum ath_stomp_type stomp_type)
 279 {
 280         struct ath_btcoex_hw *btcoex = &ah->btcoex_hw;
 281         const u32 *weight = AR_SREV_9462(ah) ? ar9003_wlan_weights[stomp_type] :
 282                                                ar9462_wlan_weights[stomp_type];
 283         int i;
 284
 285         for (i = 0; i < AR9300_NUM_WLAN_WEIGHTS; i++) {
 286                 btcoex->bt_weight[i] = AR9300_BT_WGHT;
 287                 btcoex->wlan_weight[i] = weight[i];
 288         }
 289 }
 290
 291 /*
 292  * Configures appropriate weight based on stomp type.
 293  */
 294 void ath9k_hw_btcoex_bt_stomp(struct ath_hw *ah,
 295                               enum ath_stomp_type stomp_type)
 296 {
 297         if (AR_SREV_9300_20_OR_LATER(ah)) {
 298                 ar9003_btcoex_bt_stomp(ah, stomp_type);
 299                 return;
 300         }
 301
 302         switch (stomp_type) {
 303         case ATH_BTCOEX_STOMP_ALL:
 304                 ath9k_hw_btcoex_set_weight(ah, AR_BT_COEX_WGHT,
 305                                 AR_STOMP_ALL_WLAN_WGHT);
 306                 break;
 307         case ATH_BTCOEX_STOMP_LOW:
 308                 ath9k_hw_btcoex_set_weight(ah, AR_BT_COEX_WGHT,
 309                                 AR_STOMP_LOW_WLAN_WGHT);
 310                 break;
 311         case ATH_BTCOEX_STOMP_NONE:
 312                 ath9k_hw_btcoex_set_weight(ah, AR_BT_COEX_WGHT,
 313                                 AR_STOMP_NONE_WLAN_WGHT);
 314                 break;
 315         default:
 316                 ath_dbg(ath9k_hw_common(ah), BTCOEX, "Invalid Stomptype\n");
 317                 break;
 318         }
 319 }
 320 EXPORT_SYMBOL(ath9k_hw_btcoex_bt_stomp);