linux/drivers/net/wireless/ath/carl9170/mac.c
<<
>>
Prefs
   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
  44int 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
  60int 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
  84int 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
 106int 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
 136int 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
 171int 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
 257static 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
 275int 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
 285int 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
 301int 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
 396int 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
 403int 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
 474int 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
 495int 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
 505int 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_ON(1);
 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}
 539