drivers/net/wireless/ath/carl9170/mac.c

   1 /*
   2  * Atheros CARL9170 driver
   3  *
   4  * MAC programming
   5  *
   6  * Copyright 2008, Johannes Berg <johannes@sipsolutions.net>
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License as published by
  10  * the Free Software Foundation; either version 2 of the License, or
  11  * (at your option) any later version.
  12  *
  13  * This program is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  * GNU General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU General Public License
  19  * along with this program; see the file COPYING.  If not, see
  20  * http://www.gnu.org/licenses/.
  21  *
  22  * This file incorporates work covered by the following copyright and
  23  * permission notice:
  24  *    Copyright (c) 2007-2008 Atheros Communications, Inc.
  25  *
  26  *    Permission to use, copy, modify, and/or distribute this software for any
  27  *    purpose with or without fee is hereby granted, provided that the above
  28  *    copyright notice and this permission notice appear in all copies.
  29  *
  30  *    THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
  31  *    WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
  32  *    MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
  33  *    ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
  34  *    WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
  35  *    ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
  36  *    OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  37  */
  38
  39 #include <asm/unaligned.h>
  40
  41 #include "carl9170.h"
  42 #include "cmd.h"
  43
  44 int carl9170_set_dyn_sifs_ack(struct ar9170 *ar)
  45 {
  46         u32 val;
  47
  48         if (conf_is_ht40(&ar->hw->conf))
  49                 val = 0x010a;
  50         else {
  51                 if (ar->hw->conf.chandef.chan->band == NL80211_BAND_2GHZ)
  52                         val = 0x105;
  53                 else
  54                         val = 0x104;
  55         }
  56
  57         return carl9170_write_reg(ar, AR9170_MAC_REG_DYNAMIC_SIFS_ACK, val);
  58 }
  59
  60 int carl9170_set_rts_cts_rate(struct ar9170 *ar)
  61 {
  62         u32 rts_rate, cts_rate;
  63
  64         if (conf_is_ht(&ar->hw->conf)) {
  65                 /* 12 mbit OFDM */
  66                 rts_rate = 0x1da;
  67                 cts_rate = 0x10a;
  68         } else {
  69                 if (ar->hw->conf.chandef.chan->band == NL80211_BAND_2GHZ) {
  70                         /* 11 mbit CCK */
  71                         rts_rate = 033;
  72                         cts_rate = 003;
  73                 } else {
  74                         /* 6 mbit OFDM */
  75                         rts_rate = 0x1bb;
  76                         cts_rate = 0x10b;
  77                 }
  78         }
  79
  80         return carl9170_write_reg(ar, AR9170_MAC_REG_RTS_CTS_RATE,
  81                                   rts_rate | (cts_rate) << 16);
  82 }
  83
  84 int carl9170_set_slot_time(struct ar9170 *ar)
  85 {
  86         struct ieee80211_vif *vif;
  87         u32 slottime = 20;
  88
  89         rcu_read_lock();
  90         vif = carl9170_get_main_vif(ar);
  91         if (!vif) {
  92                 rcu_read_unlock();
  93                 return 0;
  94         }
  95
  96         if ((ar->hw->conf.chandef.chan->band == NL80211_BAND_5GHZ) ||
  97             vif->bss_conf.use_short_slot)
  98                 slottime = 9;
  99
 100         rcu_read_unlock();
 101
 102         return carl9170_write_reg(ar, AR9170_MAC_REG_SLOT_TIME,
 103                                   slottime << 10);
 104 }
 105
 106 int carl9170_set_mac_rates(struct ar9170 *ar)
 107 {
 108         struct ieee80211_vif *vif;
 109         u32 basic, mandatory;
 110
 111         rcu_read_lock();
 112         vif = carl9170_get_main_vif(ar);
 113
 114         if (!vif) {
 115                 rcu_read_unlock();
 116                 return 0;
 117         }
 118
 119         basic = (vif->bss_conf.basic_rates & 0xf);
 120         basic |= (vif->bss_conf.basic_rates & 0xff0) << 4;
 121         rcu_read_unlock();
 122
 123         if (ar->hw->conf.chandef.chan->band == NL80211_BAND_5GHZ)
 124                 mandatory = 0xff00; /* OFDM 6/9/12/18/24/36/48/54 */
 125         else
 126                 mandatory = 0xff0f; /* OFDM (6/9../54) + CCK (1/2/5.5/11) */
 127
 128         carl9170_regwrite_begin(ar);
 129         carl9170_regwrite(AR9170_MAC_REG_BASIC_RATE, basic);
 130         carl9170_regwrite(AR9170_MAC_REG_MANDATORY_RATE, mandatory);
 131         carl9170_regwrite_finish();
 132
 133         return carl9170_regwrite_result();
 134 }
 135
 136 int carl9170_set_qos(struct ar9170 *ar)
 137 {
 138         carl9170_regwrite_begin(ar);
 139
 140         carl9170_regwrite(AR9170_MAC_REG_AC0_CW, ar->edcf[0].cw_min |
 141                           (ar->edcf[0].cw_max << 16));
 142         carl9170_regwrite(AR9170_MAC_REG_AC1_CW, ar->edcf[1].cw_min |
 143                           (ar->edcf[1].cw_max << 16));
 144         carl9170_regwrite(AR9170_MAC_REG_AC2_CW, ar->edcf[2].cw_min |
 145                           (ar->edcf[2].cw_max << 16));
 146         carl9170_regwrite(AR9170_MAC_REG_AC3_CW, ar->edcf[3].cw_min |
 147                           (ar->edcf[3].cw_max << 16));
 148         carl9170_regwrite(AR9170_MAC_REG_AC4_CW, ar->edcf[4].cw_min |
 149                           (ar->edcf[4].cw_max << 16));
 150
 151         carl9170_regwrite(AR9170_MAC_REG_AC2_AC1_AC0_AIFS,
 152                           ((ar->edcf[0].aifs * 9 + 10)) |
 153                           ((ar->edcf[1].aifs * 9 + 10) << 12) |
 154                           ((ar->edcf[2].aifs * 9 + 10) << 24));
 155         carl9170_regwrite(AR9170_MAC_REG_AC4_AC3_AC2_AIFS,
 156                           ((ar->edcf[2].aifs * 9 + 10) >> 8) |
 157                           ((ar->edcf[3].aifs * 9 + 10) << 4) |
 158                           ((ar->edcf[4].aifs * 9 + 10) << 16));
 159
 160         carl9170_regwrite(AR9170_MAC_REG_AC1_AC0_TXOP,
 161                           ar->edcf[0].txop | ar->edcf[1].txop << 16);
 162         carl9170_regwrite(AR9170_MAC_REG_AC3_AC2_TXOP,
 163                           ar->edcf[2].txop | ar->edcf[3].txop << 16 |
 164                           ar->edcf[4].txop << 24);
 165
 166         carl9170_regwrite_finish();
 167
 168         return carl9170_regwrite_result();
 169 }
 170
 171 int carl9170_init_mac(struct ar9170 *ar)
 172 {
 173         carl9170_regwrite_begin(ar);
 174
 175         /* switch MAC to OTUS interface */
 176         carl9170_regwrite(0x1c3600, 0x3);
 177
 178         carl9170_regwrite(AR9170_MAC_REG_ACK_EXTENSION, 0x40);
 179
 180         carl9170_regwrite(AR9170_MAC_REG_RETRY_MAX, 0x0);
 181
 182         carl9170_regwrite(AR9170_MAC_REG_FRAMETYPE_FILTER,
 183                           AR9170_MAC_FTF_MONITOR);
 184
 185         /* enable MMIC */
 186         carl9170_regwrite(AR9170_MAC_REG_SNIFFER,
 187                         AR9170_MAC_SNIFFER_DEFAULTS);
 188
 189         carl9170_regwrite(AR9170_MAC_REG_RX_THRESHOLD, 0xc1f80);
 190
 191         carl9170_regwrite(AR9170_MAC_REG_RX_PE_DELAY, 0x70);
 192         carl9170_regwrite(AR9170_MAC_REG_EIFS_AND_SIFS, 0xa144000);
 193         carl9170_regwrite(AR9170_MAC_REG_SLOT_TIME, 9 << 10);
 194
 195         /* CF-END & CF-ACK rate => 24M OFDM */
 196         carl9170_regwrite(AR9170_MAC_REG_TID_CFACK_CFEND_RATE, 0x59900000);
 197
 198         /* NAV protects ACK only (in TXOP) */
 199         carl9170_regwrite(AR9170_MAC_REG_TXOP_DURATION, 0x201);
 200
 201         /* Set Beacon PHY CTRL's TPC to 0x7, TA1=1 */
 202         /* OTUS set AM to 0x1 */
 203         carl9170_regwrite(AR9170_MAC_REG_BCN_HT1, 0x8000170);
 204
 205         carl9170_regwrite(AR9170_MAC_REG_BACKOFF_PROTECT, 0x105);
 206
 207         /* Aggregation MAX number and timeout */
 208         carl9170_regwrite(AR9170_MAC_REG_AMPDU_FACTOR, 0x8000a);
 209         carl9170_regwrite(AR9170_MAC_REG_AMPDU_DENSITY, 0x140a07);
 210
 211         carl9170_regwrite(AR9170_MAC_REG_FRAMETYPE_FILTER,
 212                           AR9170_MAC_FTF_DEFAULTS);
 213
 214         carl9170_regwrite(AR9170_MAC_REG_RX_CONTROL,
 215                           AR9170_MAC_RX_CTRL_DEAGG |
 216                           AR9170_MAC_RX_CTRL_SHORT_FILTER);
 217
 218         /* rate sets */
 219         carl9170_regwrite(AR9170_MAC_REG_BASIC_RATE, 0x150f);
 220         carl9170_regwrite(AR9170_MAC_REG_MANDATORY_RATE, 0x150f);
 221         carl9170_regwrite(AR9170_MAC_REG_RTS_CTS_RATE, 0x0030033);
 222
 223         /* MIMO response control */
 224         carl9170_regwrite(AR9170_MAC_REG_ACK_TPC, 0x4003c1e);
 225
 226         carl9170_regwrite(AR9170_MAC_REG_AMPDU_RX_THRESH, 0xffff);
 227
 228         /* set PHY register read timeout (??) */
 229         carl9170_regwrite(AR9170_MAC_REG_MISC_680, 0xf00008);
 230
 231         /* Disable Rx TimeOut, workaround for BB. */
 232         carl9170_regwrite(AR9170_MAC_REG_RX_TIMEOUT, 0x0);
 233
 234         /* Set WLAN DMA interrupt mode: generate int per packet */
 235         carl9170_regwrite(AR9170_MAC_REG_TXRX_MPI, 0x110011);
 236
 237         carl9170_regwrite(AR9170_MAC_REG_FCS_SELECT,
 238                         AR9170_MAC_FCS_FIFO_PROT);
 239
 240         /* Disables the CF_END frame, undocumented register */
 241         carl9170_regwrite(AR9170_MAC_REG_TXOP_NOT_ENOUGH_IND,
 242                         0x141e0f48);
 243
 244         /* reset group hash table */
 245         carl9170_regwrite(AR9170_MAC_REG_GROUP_HASH_TBL_L, 0xffffffff);
 246         carl9170_regwrite(AR9170_MAC_REG_GROUP_HASH_TBL_H, 0xffffffff);
 247
 248         /* disable PRETBTT interrupt */
 249         carl9170_regwrite(AR9170_MAC_REG_PRETBTT, 0x0);
 250         carl9170_regwrite(AR9170_MAC_REG_BCN_PERIOD, 0x0);
 251
 252         carl9170_regwrite_finish();
 253
 254         return carl9170_regwrite_result();
 255 }
 256
 257 static int carl9170_set_mac_reg(struct ar9170 *ar,
 258                                 const u32 reg, const u8 *mac)
 259 {
 260         static const u8 zero[ETH_ALEN] = { 0 };
 261
 262         if (!mac)
 263                 mac = zero;
 264
 265         carl9170_regwrite_begin(ar);
 266
 267         carl9170_regwrite(reg, get_unaligned_le32(mac));
 268         carl9170_regwrite(reg + 4, get_unaligned_le16(mac + 4));
 269
 270         carl9170_regwrite_finish();
 271
 272         return carl9170_regwrite_result();
 273 }
 274
 275 int carl9170_mod_virtual_mac(struct ar9170 *ar, const unsigned int id,
 276                              const u8 *mac)
 277 {
 278         if (WARN_ON(id >= ar->fw.vif_num))
 279                 return -EINVAL;
 280
 281         return carl9170_set_mac_reg(ar,
 282                 AR9170_MAC_REG_ACK_TABLE + (id - 1) * 8, mac);
 283 }
 284
 285 int carl9170_update_multicast(struct ar9170 *ar, const u64 mc_hash)
 286 {
 287         int err;
 288
 289         carl9170_regwrite_begin(ar);
 290         carl9170_regwrite(AR9170_MAC_REG_GROUP_HASH_TBL_H, mc_hash >> 32);
 291         carl9170_regwrite(AR9170_MAC_REG_GROUP_HASH_TBL_L, mc_hash);
 292         carl9170_regwrite_finish();
 293         err = carl9170_regwrite_result();
 294         if (err)
 295                 return err;
 296
 297         ar->cur_mc_hash = mc_hash;
 298         return 0;
 299 }
 300
 301 int carl9170_set_operating_mode(struct ar9170 *ar)
 302 {
 303         struct ieee80211_vif *vif;
 304         struct ath_common *common = &ar->common;
 305         u8 *mac_addr, *bssid;
 306         u32 cam_mode = AR9170_MAC_CAM_DEFAULTS;
 307         u32 enc_mode = AR9170_MAC_ENCRYPTION_DEFAULTS |
 308                 AR9170_MAC_ENCRYPTION_MGMT_RX_SOFTWARE;
 309         u32 rx_ctrl = AR9170_MAC_RX_CTRL_DEAGG |
 310                       AR9170_MAC_RX_CTRL_SHORT_FILTER;
 311         u32 sniffer = AR9170_MAC_SNIFFER_DEFAULTS;
 312         int err = 0;
 313
 314         rcu_read_lock();
 315         vif = carl9170_get_main_vif(ar);
 316
 317         if (vif) {
 318                 mac_addr = common->macaddr;
 319                 bssid = common->curbssid;
 320
 321                 switch (vif->type) {
 322                 case NL80211_IFTYPE_ADHOC:
 323                         cam_mode |= AR9170_MAC_CAM_IBSS;
 324                         break;
 325                 case NL80211_IFTYPE_MESH_POINT:
 326                 case NL80211_IFTYPE_AP:
 327                         cam_mode |= AR9170_MAC_CAM_AP;
 328
 329                         /* iwlagn 802.11n STA Workaround */
 330                         rx_ctrl |= AR9170_MAC_RX_CTRL_PASS_TO_HOST;
 331                         break;
 332                 case NL80211_IFTYPE_WDS:
 333                         cam_mode |= AR9170_MAC_CAM_AP_WDS;
 334                         rx_ctrl |= AR9170_MAC_RX_CTRL_PASS_TO_HOST;
 335                         break;
 336                 case NL80211_IFTYPE_STATION:
 337                         cam_mode |= AR9170_MAC_CAM_STA;
 338                         rx_ctrl |= AR9170_MAC_RX_CTRL_PASS_TO_HOST;
 339                         break;
 340                 default:
 341                         WARN(1, "Unsupported operation mode %x\n", vif->type);
 342                         err = -EOPNOTSUPP;
 343                         break;
 344                 }
 345         } else {
 346                 /*
 347                  * Enable monitor mode
 348                  *
 349                  * rx_ctrl |= AR9170_MAC_RX_CTRL_ACK_IN_SNIFFER;
 350                  * sniffer |= AR9170_MAC_SNIFFER_ENABLE_PROMISC;
 351                  *
 352                  * When the hardware is in SNIFFER_PROMISC mode,
 353                  * it generates spurious ACKs for every incoming
 354                  * frame. This confuses every peer in the
 355                  * vicinity and the network throughput will suffer
 356                  * badly.
 357                  *
 358                  * Hence, the hardware will be put into station
 359                  * mode and just the rx filters are disabled.
 360                  */
 361                 cam_mode |= AR9170_MAC_CAM_STA;
 362                 rx_ctrl |= AR9170_MAC_RX_CTRL_PASS_TO_HOST;
 363                 mac_addr = common->macaddr;
 364                 bssid = NULL;
 365         }
 366         rcu_read_unlock();
 367
 368         if (err)
 369                 return err;
 370
 371         if (ar->rx_software_decryption)
 372                 enc_mode |= AR9170_MAC_ENCRYPTION_RX_SOFTWARE;
 373
 374         if (ar->sniffer_enabled) {
 375                 enc_mode |= AR9170_MAC_ENCRYPTION_RX_SOFTWARE;
 376         }
 377
 378         err = carl9170_set_mac_reg(ar, AR9170_MAC_REG_MAC_ADDR_L, mac_addr);
 379         if (err)
 380                 return err;
 381
 382         err = carl9170_set_mac_reg(ar, AR9170_MAC_REG_BSSID_L, bssid);
 383         if (err)
 384                 return err;
 385
 386         carl9170_regwrite_begin(ar);
 387         carl9170_regwrite(AR9170_MAC_REG_SNIFFER, sniffer);
 388         carl9170_regwrite(AR9170_MAC_REG_CAM_MODE, cam_mode);
 389         carl9170_regwrite(AR9170_MAC_REG_ENCRYPTION, enc_mode);
 390         carl9170_regwrite(AR9170_MAC_REG_RX_CONTROL, rx_ctrl);
 391         carl9170_regwrite_finish();
 392
 393         return carl9170_regwrite_result();
 394 }
 395
 396 int carl9170_set_hwretry_limit(struct ar9170 *ar, const unsigned int max_retry)
 397 {
 398         u32 tmp = min_t(u32, 0x33333, max_retry * 0x11111);
 399
 400         return carl9170_write_reg(ar, AR9170_MAC_REG_RETRY_MAX, tmp);
 401 }
 402
 403 int carl9170_set_beacon_timers(struct ar9170 *ar)
 404 {
 405         struct ieee80211_vif *vif;
 406         u32 v = 0;
 407         u32 pretbtt = 0;
 408
 409         rcu_read_lock();
 410         vif = carl9170_get_main_vif(ar);
 411
 412         if (vif) {
 413                 struct carl9170_vif_info *mvif;
 414                 mvif = (void *) vif->drv_priv;
 415
 416                 if (mvif->enable_beacon && !WARN_ON(!ar->beacon_enabled)) {
 417                         ar->global_beacon_int = vif->bss_conf.beacon_int /
 418                                                 ar->beacon_enabled;
 419
 420                         SET_VAL(AR9170_MAC_BCN_DTIM, v,
 421                                 vif->bss_conf.dtim_period);
 422
 423                         switch (vif->type) {
 424                         case NL80211_IFTYPE_MESH_POINT:
 425                         case NL80211_IFTYPE_ADHOC:
 426                                 v |= AR9170_MAC_BCN_IBSS_MODE;
 427                                 break;
 428                         case NL80211_IFTYPE_AP:
 429                                 v |= AR9170_MAC_BCN_AP_MODE;
 430                                 break;
 431                         default:
 432                                 WARN_ON_ONCE(1);
 433                                 break;
 434                         }
 435                 } else if (vif->type == NL80211_IFTYPE_STATION) {
 436                         ar->global_beacon_int = vif->bss_conf.beacon_int;
 437
 438                         SET_VAL(AR9170_MAC_BCN_DTIM, v,
 439                                 ar->hw->conf.ps_dtim_period);
 440
 441                         v |= AR9170_MAC_BCN_STA_PS |
 442                              AR9170_MAC_BCN_PWR_MGT;
 443                 }
 444
 445                 if (ar->global_beacon_int) {
 446                         if (ar->global_beacon_int < 15) {
 447                                 rcu_read_unlock();
 448                                 return -ERANGE;
 449                         }
 450
 451                         ar->global_pretbtt = ar->global_beacon_int -
 452                                         CARL9170_PRETBTT_KUS;
 453                 } else {
 454                         ar->global_pretbtt = 0;
 455                 }
 456         } else {
 457                 ar->global_beacon_int = 0;
 458                 ar->global_pretbtt = 0;
 459         }
 460
 461         rcu_read_unlock();
 462
 463         SET_VAL(AR9170_MAC_BCN_PERIOD, v, ar->global_beacon_int);
 464         SET_VAL(AR9170_MAC_PRETBTT, pretbtt, ar->global_pretbtt);
 465         SET_VAL(AR9170_MAC_PRETBTT2, pretbtt, ar->global_pretbtt);
 466
 467         carl9170_regwrite_begin(ar);
 468         carl9170_regwrite(AR9170_MAC_REG_PRETBTT, pretbtt);
 469         carl9170_regwrite(AR9170_MAC_REG_BCN_PERIOD, v);
 470         carl9170_regwrite_finish();
 471         return carl9170_regwrite_result();
 472 }
 473
 474 int carl9170_upload_key(struct ar9170 *ar, const u8 id, const u8 *mac,
 475                         const u8 ktype, const u8 keyidx, const u8 *keydata,
 476                         const int keylen)
 477 {
 478         struct carl9170_set_key_cmd key = { };
 479         static const u8 bcast[ETH_ALEN] = {
 480                 0xff, 0xff, 0xff, 0xff, 0xff, 0xff };
 481
 482         mac = mac ? : bcast;
 483
 484         key.user = cpu_to_le16(id);
 485         key.keyId = cpu_to_le16(keyidx);
 486         key.type = cpu_to_le16(ktype);
 487         memcpy(&key.macAddr, mac, ETH_ALEN);
 488         if (keydata)
 489                 memcpy(&key.key, keydata, keylen);
 490
 491         return carl9170_exec_cmd(ar, CARL9170_CMD_EKEY,
 492                 sizeof(key), (u8 *)&key, 0, NULL);
 493 }
 494
 495 int carl9170_disable_key(struct ar9170 *ar, const u8 id)
 496 {
 497         struct carl9170_disable_key_cmd key = { };
 498
 499         key.user = cpu_to_le16(id);
 500
 501         return carl9170_exec_cmd(ar, CARL9170_CMD_DKEY,
 502                 sizeof(key), (u8 *)&key, 0, NULL);
 503 }
 504
 505 int carl9170_set_mac_tpc(struct ar9170 *ar, struct ieee80211_channel *channel)
 506 {
 507         unsigned int power, chains;
 508
 509         if (ar->eeprom.tx_mask != 1)
 510                 chains = AR9170_TX_PHY_TXCHAIN_2;
 511         else
 512                 chains = AR9170_TX_PHY_TXCHAIN_1;
 513
 514         switch (channel->band) {
 515         case NL80211_BAND_2GHZ:
 516                 power = ar->power_2G_ofdm[0] & 0x3f;
 517                 break;
 518         case NL80211_BAND_5GHZ:
 519                 power = ar->power_5G_leg[0] & 0x3f;
 520                 break;
 521         default:
 522                 BUG();
 523         }
 524
 525         power = min_t(unsigned int, power, ar->hw->conf.power_level * 2);
 526
 527         carl9170_regwrite_begin(ar);
 528         carl9170_regwrite(AR9170_MAC_REG_ACK_TPC,
 529                           0x3c1e | power << 20 | chains << 26);
 530         carl9170_regwrite(AR9170_MAC_REG_RTS_CTS_TPC,
 531                           power << 5 | chains << 11 |
 532                           power << 21 | chains << 27);
 533         carl9170_regwrite(AR9170_MAC_REG_CFEND_QOSNULL_TPC,
 534                           power << 5 | chains << 11 |
 535                           power << 21 | chains << 27);
 536         carl9170_regwrite_finish();
 537         return carl9170_regwrite_result();
 538 }