LXR linux/drivers/net/wireless/ath/ar9170/mac.c

   1/*
   2 * Atheros AR9170 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#include "ar9170.h"
  39#include "cmd.h"
  40
  41int ar9170_set_dyn_sifs_ack(struct ar9170 *ar)
  42{
  43        u32 val;
  44
  45        if (conf_is_ht40(&ar->hw->conf))
  46                val = 0x010a;
  47        else {
  48                if (ar->hw->conf.channel->band == IEEE80211_BAND_2GHZ)
  49                        val = 0x105;
  50                else
  51                        val = 0x104;
  52        }
  53
  54        return ar9170_write_reg(ar, AR9170_MAC_REG_DYNAMIC_SIFS_ACK, val);
  55}
  56
  57int ar9170_set_slot_time(struct ar9170 *ar)
  58{
  59        u32 slottime = 20;
  60
  61        if (!ar->vif)
  62                return 0;
  63
  64        if ((ar->hw->conf.channel->band == IEEE80211_BAND_5GHZ) ||
  65            ar->vif->bss_conf.use_short_slot)
  66                slottime = 9;
  67
  68        return ar9170_write_reg(ar, AR9170_MAC_REG_SLOT_TIME, slottime << 10);
  69}
  70
  71int ar9170_set_basic_rates(struct ar9170 *ar)
  72{
  73        u8 cck, ofdm;
  74
  75        if (!ar->vif)
  76                return 0;
  77
  78        ofdm = ar->vif->bss_conf.basic_rates >> 4;
  79
  80        /* FIXME: is still necessary? */
  81        if (ar->hw->conf.channel->band == IEEE80211_BAND_5GHZ)
  82                cck = 0;
  83        else
  84                cck = ar->vif->bss_conf.basic_rates & 0xf;
  85
  86        return ar9170_write_reg(ar, AR9170_MAC_REG_BASIC_RATE,
  87                                ofdm << 8 | cck);
  88}
  89
  90int ar9170_set_qos(struct ar9170 *ar)
  91{
  92        ar9170_regwrite_begin(ar);
  93
  94        ar9170_regwrite(AR9170_MAC_REG_AC0_CW, ar->edcf[0].cw_min |
  95                        (ar->edcf[0].cw_max << 16));
  96        ar9170_regwrite(AR9170_MAC_REG_AC1_CW, ar->edcf[1].cw_min |
  97                        (ar->edcf[1].cw_max << 16));
  98        ar9170_regwrite(AR9170_MAC_REG_AC2_CW, ar->edcf[2].cw_min |
  99                        (ar->edcf[2].cw_max << 16));
 100        ar9170_regwrite(AR9170_MAC_REG_AC3_CW, ar->edcf[3].cw_min |
 101                        (ar->edcf[3].cw_max << 16));
 102        ar9170_regwrite(AR9170_MAC_REG_AC4_CW, ar->edcf[4].cw_min |
 103                        (ar->edcf[4].cw_max << 16));
 104
 105        ar9170_regwrite(AR9170_MAC_REG_AC1_AC0_AIFS,
 106                        ((ar->edcf[0].aifs * 9 + 10)) |
 107                        ((ar->edcf[1].aifs * 9 + 10) << 12) |
 108                        ((ar->edcf[2].aifs * 9 + 10) << 24));
 109        ar9170_regwrite(AR9170_MAC_REG_AC3_AC2_AIFS,
 110                        ((ar->edcf[2].aifs * 9 + 10) >> 8) |
 111                        ((ar->edcf[3].aifs * 9 + 10) << 4) |
 112                        ((ar->edcf[4].aifs * 9 + 10) << 16));
 113
 114        ar9170_regwrite(AR9170_MAC_REG_AC1_AC0_TXOP,
 115                        ar->edcf[0].txop | ar->edcf[1].txop << 16);
 116        ar9170_regwrite(AR9170_MAC_REG_AC3_AC2_TXOP,
 117                        ar->edcf[1].txop | ar->edcf[3].txop << 16);
 118
 119        ar9170_regwrite_finish();
 120
 121        return ar9170_regwrite_result();
 122}
 123
 124static int ar9170_set_ampdu_density(struct ar9170 *ar, u8 mpdudensity)
 125{
 126        u32 val;
 127
 128        /* don't allow AMPDU density > 8us */
 129        if (mpdudensity > 6)
 130                return -EINVAL;
 131
 132        /* Watch out! Otus uses slightly different density values. */
 133        val = 0x140a00 | (mpdudensity ? (mpdudensity + 1) : 0);
 134
 135        ar9170_regwrite_begin(ar);
 136        ar9170_regwrite(AR9170_MAC_REG_AMPDU_DENSITY, val);
 137        ar9170_regwrite_finish();
 138
 139        return ar9170_regwrite_result();
 140}
 141
 142int ar9170_init_mac(struct ar9170 *ar)
 143{
 144        ar9170_regwrite_begin(ar);
 145
 146        ar9170_regwrite(AR9170_MAC_REG_ACK_EXTENSION, 0x40);
 147
 148        ar9170_regwrite(AR9170_MAC_REG_RETRY_MAX, 0);
 149
 150        /* enable MMIC */
 151        ar9170_regwrite(AR9170_MAC_REG_SNIFFER,
 152                        AR9170_MAC_REG_SNIFFER_DEFAULTS);
 153
 154        ar9170_regwrite(AR9170_MAC_REG_RX_THRESHOLD, 0xc1f80);
 155
 156        ar9170_regwrite(AR9170_MAC_REG_RX_PE_DELAY, 0x70);
 157        ar9170_regwrite(AR9170_MAC_REG_EIFS_AND_SIFS, 0xa144000);
 158        ar9170_regwrite(AR9170_MAC_REG_SLOT_TIME, 9 << 10);
 159
 160        /* CF-END mode */
 161        ar9170_regwrite(0x1c3b2c, 0x19000000);
 162
 163        /* NAV protects ACK only (in TXOP) */
 164        ar9170_regwrite(0x1c3b38, 0x201);
 165
 166        /* Set Beacon PHY CTRL's TPC to 0x7, TA1=1 */
 167        /* OTUS set AM to 0x1 */
 168        ar9170_regwrite(AR9170_MAC_REG_BCN_HT1, 0x8000170);
 169
 170        ar9170_regwrite(AR9170_MAC_REG_BACKOFF_PROTECT, 0x105);
 171
 172        /* AGG test code*/
 173        /* Aggregation MAX number and timeout */
 174        ar9170_regwrite(0x1c3b9c, 0x10000a);
 175
 176        ar9170_regwrite(AR9170_MAC_REG_FRAMETYPE_FILTER,
 177                        AR9170_MAC_REG_FTF_DEFAULTS);
 178
 179        /* Enable deaggregator, response in sniffer mode */
 180        ar9170_regwrite(0x1c3c40, 0x1 | 1<<30);
 181
 182        /* rate sets */
 183        ar9170_regwrite(AR9170_MAC_REG_BASIC_RATE, 0x150f);
 184        ar9170_regwrite(AR9170_MAC_REG_MANDATORY_RATE, 0x150f);
 185        ar9170_regwrite(AR9170_MAC_REG_RTS_CTS_RATE, 0x10b01bb);
 186
 187        /* MIMO response control */
 188        ar9170_regwrite(0x1c3694, 0x4003C1E);/* bit 26~28  otus-AM */
 189
 190        /* switch MAC to OTUS interface */
 191        ar9170_regwrite(0x1c3600, 0x3);
 192
 193        ar9170_regwrite(AR9170_MAC_REG_AMPDU_RX_THRESH, 0xffff);
 194
 195        /* set PHY register read timeout (??) */
 196        ar9170_regwrite(AR9170_MAC_REG_MISC_680, 0xf00008);
 197
 198        /* Disable Rx TimeOut, workaround for BB. */
 199        ar9170_regwrite(AR9170_MAC_REG_RX_TIMEOUT, 0x0);
 200
 201        /* Set CPU clock frequency to 88/80MHz */
 202        ar9170_regwrite(AR9170_PWR_REG_CLOCK_SEL,
 203                        AR9170_PWR_CLK_AHB_80_88MHZ |
 204                        AR9170_PWR_CLK_DAC_160_INV_DLY);
 205
 206        /* Set WLAN DMA interrupt mode: generate int per packet */
 207        ar9170_regwrite(AR9170_MAC_REG_TXRX_MPI, 0x110011);
 208
 209        ar9170_regwrite(AR9170_MAC_REG_FCS_SELECT,
 210                        AR9170_MAC_FCS_FIFO_PROT);
 211
 212        /* Disables the CF_END frame, undocumented register */
 213        ar9170_regwrite(AR9170_MAC_REG_TXOP_NOT_ENOUGH_IND,
 214                        0x141E0F48);
 215
 216        ar9170_regwrite_finish();
 217
 218        return ar9170_regwrite_result();
 219}
 220
 221static int ar9170_set_mac_reg(struct ar9170 *ar, const u32 reg, const u8 *mac)
 222{
 223        static const u8 zero[ETH_ALEN] = { 0 };
 224
 225        if (!mac)
 226                mac = zero;
 227
 228        ar9170_regwrite_begin(ar);
 229
 230        ar9170_regwrite(reg,
 231                        (mac[3] << 24) | (mac[2] << 16) |
 232                        (mac[1] << 8) | mac[0]);
 233
 234        ar9170_regwrite(reg + 4, (mac[5] << 8) | mac[4]);
 235
 236        ar9170_regwrite_finish();
 237
 238        return ar9170_regwrite_result();
 239}
 240
 241int ar9170_update_multicast(struct ar9170 *ar, const u64 mc_hash)
 242{
 243        int err;
 244
 245        ar9170_regwrite_begin(ar);
 246        ar9170_regwrite(AR9170_MAC_REG_GROUP_HASH_TBL_H, mc_hash >> 32);
 247        ar9170_regwrite(AR9170_MAC_REG_GROUP_HASH_TBL_L, mc_hash);
 248        ar9170_regwrite_finish();
 249        err = ar9170_regwrite_result();
 250        if (err)
 251                return err;
 252
 253        ar->cur_mc_hash = mc_hash;
 254        return 0;
 255}
 256
 257int ar9170_update_frame_filter(struct ar9170 *ar, const u32 filter)
 258{
 259        int err;
 260
 261        err = ar9170_write_reg(ar, AR9170_MAC_REG_FRAMETYPE_FILTER, filter);
 262        if (err)
 263                return err;
 264
 265        ar->cur_filter = filter;
 266        return 0;
 267}
 268
 269static int ar9170_set_promiscouous(struct ar9170 *ar)
 270{
 271        u32 encr_mode, sniffer;
 272        int err;
 273
 274        err = ar9170_read_reg(ar, AR9170_MAC_REG_SNIFFER, &sniffer);
 275        if (err)
 276                return err;
 277
 278        err = ar9170_read_reg(ar, AR9170_MAC_REG_ENCRYPTION, &encr_mode);
 279        if (err)
 280                return err;
 281
 282        if (ar->sniffer_enabled) {
 283                sniffer |= AR9170_MAC_REG_SNIFFER_ENABLE_PROMISC;
 284
 285                /*
 286                 * Rx decryption works in place.
 287                 *
 288                 * If we don't disable it, the hardware will render all
 289                 * encrypted frames which are encrypted with an unknown
 290                 * key useless.
 291                 */
 292
 293                encr_mode |= AR9170_MAC_REG_ENCRYPTION_RX_SOFTWARE;
 294                ar->sniffer_enabled = true;
 295        } else {
 296                sniffer &= ~AR9170_MAC_REG_SNIFFER_ENABLE_PROMISC;
 297
 298                if (ar->rx_software_decryption)
 299                        encr_mode |= AR9170_MAC_REG_ENCRYPTION_RX_SOFTWARE;
 300                else
 301                        encr_mode &= ~AR9170_MAC_REG_ENCRYPTION_RX_SOFTWARE;
 302        }
 303
 304        ar9170_regwrite_begin(ar);
 305        ar9170_regwrite(AR9170_MAC_REG_ENCRYPTION, encr_mode);
 306        ar9170_regwrite(AR9170_MAC_REG_SNIFFER, sniffer);
 307        ar9170_regwrite_finish();
 308
 309        return ar9170_regwrite_result();
 310}
 311
 312int ar9170_set_operating_mode(struct ar9170 *ar)
 313{
 314        u32 pm_mode = AR9170_MAC_REG_POWERMGT_DEFAULTS;
 315        u8 *mac_addr, *bssid;
 316        int err;
 317
 318        if (ar->vif) {
 319                mac_addr = ar->mac_addr;
 320                bssid = ar->bssid;
 321
 322                switch (ar->vif->type) {
 323                case NL80211_IFTYPE_MESH_POINT:
 324                case NL80211_IFTYPE_ADHOC:
 325                        pm_mode |= AR9170_MAC_REG_POWERMGT_IBSS;
 326                        break;
 327                case NL80211_IFTYPE_AP:
 328                        pm_mode |= AR9170_MAC_REG_POWERMGT_AP;
 329                        break;
 330                case NL80211_IFTYPE_WDS:
 331                        pm_mode |= AR9170_MAC_REG_POWERMGT_AP_WDS;
 332                        break;
 333                case NL80211_IFTYPE_MONITOR:
 334                        ar->sniffer_enabled = true;
 335                        ar->rx_software_decryption = true;
 336                        break;
 337                default:
 338                        pm_mode |= AR9170_MAC_REG_POWERMGT_STA;
 339                        break;
 340                }
 341        } else {
 342                mac_addr = NULL;
 343                bssid = NULL;
 344        }
 345
 346        err = ar9170_set_mac_reg(ar, AR9170_MAC_REG_MAC_ADDR_L, mac_addr);
 347        if (err)
 348                return err;
 349
 350        err = ar9170_set_mac_reg(ar, AR9170_MAC_REG_BSSID_L, bssid);
 351        if (err)
 352                return err;
 353
 354        err = ar9170_set_promiscouous(ar);
 355        if (err)
 356                return err;
 357
 358        /* set AMPDU density to 8us. */
 359        err = ar9170_set_ampdu_density(ar, 6);
 360        if (err)
 361                return err;
 362
 363        ar9170_regwrite_begin(ar);
 364
 365        ar9170_regwrite(AR9170_MAC_REG_POWERMANAGEMENT, pm_mode);
 366        ar9170_regwrite_finish();
 367
 368        return ar9170_regwrite_result();
 369}
 370
 371int ar9170_set_hwretry_limit(struct ar9170 *ar, unsigned int max_retry)
 372{
 373        u32 tmp = min_t(u32, 0x33333, max_retry * 0x11111);
 374
 375        return ar9170_write_reg(ar, AR9170_MAC_REG_RETRY_MAX, tmp);
 376}
 377
 378int ar9170_set_beacon_timers(struct ar9170 *ar)
 379{
 380        u32 v = 0;
 381        u32 pretbtt = 0;
 382
 383        if (ar->vif) {
 384                v |= ar->vif->bss_conf.beacon_int;
 385
 386                if (ar->enable_beacon) {
 387                        switch (ar->vif->type) {
 388                        case NL80211_IFTYPE_MESH_POINT:
 389                        case NL80211_IFTYPE_ADHOC:
 390                                v |= BIT(25);
 391                                break;
 392                        case NL80211_IFTYPE_AP:
 393                                v |= BIT(24);
 394                                pretbtt = (ar->vif->bss_conf.beacon_int - 6) <<
 395                                          16;
 396                                break;
 397                        default:
 398                        break;
 399                        }
 400                }
 401
 402                v |= ar->vif->bss_conf.dtim_period << 16;
 403        }
 404
 405        ar9170_regwrite_begin(ar);
 406        ar9170_regwrite(AR9170_MAC_REG_PRETBTT, pretbtt);
 407        ar9170_regwrite(AR9170_MAC_REG_BCN_PERIOD, v);
 408        ar9170_regwrite_finish();
 409        return ar9170_regwrite_result();
 410}
 411
 412int ar9170_update_beacon(struct ar9170 *ar)
 413{
 414        struct sk_buff *skb;
 415        __le32 *data, *old = NULL;
 416        u32 word;
 417        int i;
 418
 419        skb = ieee80211_beacon_get(ar->hw, ar->vif);
 420        if (!skb)
 421                return -ENOMEM;
 422
 423        data = (__le32 *)skb->data;
 424        if (ar->beacon)
 425                old = (__le32 *)ar->beacon->data;
 426
 427        ar9170_regwrite_begin(ar);
 428        for (i = 0; i < DIV_ROUND_UP(skb->len, 4); i++) {
 429                /*
 430                 * XXX: This accesses beyond skb data for up
 431                 *      to the last 3 bytes!!
 432                 */
 433
 434                if (old && (data[i] == old[i]))
 435                        continue;
 436
 437                word = le32_to_cpu(data[i]);
 438                ar9170_regwrite(AR9170_BEACON_BUFFER_ADDRESS + 4 * i, word);
 439        }
 440
 441        /* XXX: use skb->cb info */
 442        if (ar->hw->conf.channel->band == IEEE80211_BAND_2GHZ)
 443                ar9170_regwrite(AR9170_MAC_REG_BCN_PLCP,
 444                                ((skb->len + 4) << (3 + 16)) + 0x0400);
 445        else
 446                ar9170_regwrite(AR9170_MAC_REG_BCN_PLCP,
 447                                ((skb->len + 4) << 16) + 0x001b);
 448
 449        ar9170_regwrite(AR9170_MAC_REG_BCN_LENGTH, skb->len + 4);
 450        ar9170_regwrite(AR9170_MAC_REG_BCN_ADDR, AR9170_BEACON_BUFFER_ADDRESS);
 451        ar9170_regwrite(AR9170_MAC_REG_BCN_CTRL, 1);
 452
 453        ar9170_regwrite_finish();
 454
 455        dev_kfree_skb(ar->beacon);
 456        ar->beacon = skb;
 457
 458        return ar9170_regwrite_result();
 459}
 460
 461void ar9170_new_beacon(struct work_struct *work)
 462{
 463        struct ar9170 *ar = container_of(work, struct ar9170,
 464                                         beacon_work);
 465        struct sk_buff *skb;
 466
 467        if (unlikely(!IS_STARTED(ar)))
 468                return ;
 469
 470        mutex_lock(&ar->mutex);
 471
 472        if (!ar->vif)
 473                goto out;
 474
 475        ar9170_update_beacon(ar);
 476
 477        rcu_read_lock();
 478        while ((skb = ieee80211_get_buffered_bc(ar->hw, ar->vif)))
 479                ar9170_op_tx(ar->hw, skb);
 480
 481        rcu_read_unlock();
 482
 483 out:
 484        mutex_unlock(&ar->mutex);
 485}
 486
 487int ar9170_upload_key(struct ar9170 *ar, u8 id, const u8 *mac, u8 ktype,
 488                      u8 keyidx, u8 *keydata, int keylen)
 489{
 490        __le32 vals[7];
 491        static const u8 bcast[ETH_ALEN] =
 492                { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff };
 493        u8 dummy;
 494
 495        mac = mac ? : bcast;
 496
 497        vals[0] = cpu_to_le32((keyidx << 16) + id);
 498        vals[1] = cpu_to_le32(mac[1] << 24 | mac[0] << 16 | ktype);
 499        vals[2] = cpu_to_le32(mac[5] << 24 | mac[4] << 16 |
 500                              mac[3] << 8 | mac[2]);
 501        memset(&vals[3], 0, 16);
 502        if (keydata)
 503                memcpy(&vals[3], keydata, keylen);
 504
 505        return ar->exec_cmd(ar, AR9170_CMD_EKEY,
 506                            sizeof(vals), (u8 *)vals,
 507                            1, &dummy);
 508}
 509
 510int ar9170_disable_key(struct ar9170 *ar, u8 id)
 511{
 512        __le32 val = cpu_to_le32(id);
 513        u8 dummy;
 514
 515        return ar->exec_cmd(ar, AR9170_CMD_EKEY,
 516                            sizeof(val), (u8 *)&val,
 517                            1, &dummy);
 518}
 519