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
  41 int ar9170_set_qos(struct ar9170 *ar)
  42 {
  43         ar9170_regwrite_begin(ar);
  44
  45         ar9170_regwrite(AR9170_MAC_REG_AC0_CW, ar->edcf[0].cw_min |
  46                         (ar->edcf[0].cw_max << 16));
  47         ar9170_regwrite(AR9170_MAC_REG_AC1_CW, ar->edcf[1].cw_min |
  48                         (ar->edcf[1].cw_max << 16));
  49         ar9170_regwrite(AR9170_MAC_REG_AC2_CW, ar->edcf[2].cw_min |
  50                         (ar->edcf[2].cw_max << 16));
  51         ar9170_regwrite(AR9170_MAC_REG_AC3_CW, ar->edcf[3].cw_min |
  52                         (ar->edcf[3].cw_max << 16));
  53         ar9170_regwrite(AR9170_MAC_REG_AC4_CW, ar->edcf[4].cw_min |
  54                         (ar->edcf[4].cw_max << 16));
  55
  56         ar9170_regwrite(AR9170_MAC_REG_AC1_AC0_AIFS,
  57                         ((ar->edcf[0].aifs * 9 + 10)) |
  58                         ((ar->edcf[1].aifs * 9 + 10) << 12) |
  59                         ((ar->edcf[2].aifs * 9 + 10) << 24));
  60         ar9170_regwrite(AR9170_MAC_REG_AC3_AC2_AIFS,
  61                         ((ar->edcf[2].aifs * 9 + 10) >> 8) |
  62                         ((ar->edcf[3].aifs * 9 + 10) << 4) |
  63                         ((ar->edcf[4].aifs * 9 + 10) << 16));
  64
  65         ar9170_regwrite(AR9170_MAC_REG_AC1_AC0_TXOP,
  66                         ar->edcf[0].txop | ar->edcf[1].txop << 16);
  67         ar9170_regwrite(AR9170_MAC_REG_AC3_AC2_TXOP,
  68                         ar->edcf[1].txop | ar->edcf[3].txop << 16);
  69
  70         ar9170_regwrite_finish();
  71
  72         return ar9170_regwrite_result();
  73 }
  74
  75 static int ar9170_set_ampdu_density(struct ar9170 *ar, u8 mpdudensity)
  76 {
  77         u32 val;
  78
  79         /* don't allow AMPDU density > 8us */
  80         if (mpdudensity > 6)
  81                 return -EINVAL;
  82
  83         /* Watch out! Otus uses slightly different density values. */
  84         val = 0x140a00 | (mpdudensity ? (mpdudensity + 1) : 0);
  85
  86         ar9170_regwrite_begin(ar);
  87         ar9170_regwrite(AR9170_MAC_REG_AMPDU_SET, val);
  88         ar9170_regwrite_finish();
  89
  90         return ar9170_regwrite_result();
  91 }
  92
  93 int ar9170_init_mac(struct ar9170 *ar)
  94 {
  95         ar9170_regwrite_begin(ar);
  96
  97         ar9170_regwrite(AR9170_MAC_REG_ACK_EXTENSION, 0x40);
  98
  99         ar9170_regwrite(AR9170_MAC_REG_RETRY_MAX, 0);
 100
 101         /* enable MMIC */
 102         ar9170_regwrite(AR9170_MAC_REG_SNIFFER,
 103                         AR9170_MAC_REG_SNIFFER_DEFAULTS);
 104
 105         ar9170_regwrite(AR9170_MAC_REG_RX_THRESHOLD, 0xc1f80);
 106
 107         ar9170_regwrite(AR9170_MAC_REG_RX_PE_DELAY, 0x70);
 108         ar9170_regwrite(AR9170_MAC_REG_EIFS_AND_SIFS, 0xa144000);
 109         ar9170_regwrite(AR9170_MAC_REG_SLOT_TIME, 9 << 10);
 110
 111         /* CF-END mode */
 112         ar9170_regwrite(0x1c3b2c, 0x19000000);
 113
 114         /* NAV protects ACK only (in TXOP) */
 115         ar9170_regwrite(0x1c3b38, 0x201);
 116
 117         /* Set Beacon PHY CTRL's TPC to 0x7, TA1=1 */
 118         /* OTUS set AM to 0x1 */
 119         ar9170_regwrite(AR9170_MAC_REG_BCN_HT1, 0x8000170);
 120
 121         ar9170_regwrite(AR9170_MAC_REG_BACKOFF_PROTECT, 0x105);
 122
 123         /* AGG test code*/
 124         /* Aggregation MAX number and timeout */
 125         ar9170_regwrite(0x1c3b9c, 0x10000a);
 126
 127         ar9170_regwrite(AR9170_MAC_REG_FRAMETYPE_FILTER,
 128                         AR9170_MAC_REG_FTF_DEFAULTS);
 129
 130         /* Enable deaggregator, response in sniffer mode */
 131         ar9170_regwrite(0x1c3c40, 0x1 | 1<<30);
 132
 133         /* rate sets */
 134         ar9170_regwrite(AR9170_MAC_REG_BASIC_RATE, 0x150f);
 135         ar9170_regwrite(AR9170_MAC_REG_MANDATORY_RATE, 0x150f);
 136         ar9170_regwrite(AR9170_MAC_REG_RTS_CTS_RATE, 0x10b01bb);
 137
 138         /* MIMO response control */
 139         ar9170_regwrite(0x1c3694, 0x4003C1E);/* bit 26~28  otus-AM */
 140
 141         /* switch MAC to OTUS interface */
 142         ar9170_regwrite(0x1c3600, 0x3);
 143
 144         ar9170_regwrite(AR9170_MAC_REG_AMPDU_RX_THRESH, 0xffff);
 145
 146         /* set PHY register read timeout (??) */
 147         ar9170_regwrite(AR9170_MAC_REG_MISC_680, 0xf00008);
 148
 149         /* Disable Rx TimeOut, workaround for BB. */
 150         ar9170_regwrite(AR9170_MAC_REG_RX_TIMEOUT, 0x0);
 151
 152         /* Set CPU clock frequency to 88/80MHz */
 153         ar9170_regwrite(AR9170_PWR_REG_CLOCK_SEL,
 154                         AR9170_PWR_CLK_AHB_80_88MHZ |
 155                         AR9170_PWR_CLK_DAC_160_INV_DLY);
 156
 157         /* Set WLAN DMA interrupt mode: generate int per packet */
 158         ar9170_regwrite(AR9170_MAC_REG_TXRX_MPI, 0x110011);
 159
 160         ar9170_regwrite(AR9170_MAC_REG_FCS_SELECT,
 161                         AR9170_MAC_FCS_FIFO_PROT);
 162
 163         /* Disables the CF_END frame, undocumented register */
 164         ar9170_regwrite(AR9170_MAC_REG_TXOP_NOT_ENOUGH_IND,
 165                         0x141E0F48);
 166
 167         ar9170_regwrite_finish();
 168
 169         return ar9170_regwrite_result();
 170 }
 171
 172 static int ar9170_set_mac_reg(struct ar9170 *ar, const u32 reg, const u8 *mac)
 173 {
 174         static const u8 zero[ETH_ALEN] = { 0 };
 175
 176         if (!mac)
 177                 mac = zero;
 178
 179         ar9170_regwrite_begin(ar);
 180
 181         ar9170_regwrite(reg,
 182                         (mac[3] << 24) | (mac[2] << 16) |
 183                         (mac[1] << 8) | mac[0]);
 184
 185         ar9170_regwrite(reg + 4, (mac[5] << 8) | mac[4]);
 186
 187         ar9170_regwrite_finish();
 188
 189         return ar9170_regwrite_result();
 190 }
 191
 192 int ar9170_update_multicast(struct ar9170 *ar)
 193 {
 194         int err;
 195
 196         ar9170_regwrite_begin(ar);
 197         ar9170_regwrite(AR9170_MAC_REG_GROUP_HASH_TBL_H,
 198                 ar->want_mc_hash >> 32);
 199         ar9170_regwrite(AR9170_MAC_REG_GROUP_HASH_TBL_L,
 200                 ar->want_mc_hash);
 201
 202         ar9170_regwrite_finish();
 203         err = ar9170_regwrite_result();
 204
 205         if (err)
 206                 return err;
 207
 208         ar->cur_mc_hash = ar->want_mc_hash;
 209
 210         return 0;
 211 }
 212
 213 int ar9170_update_frame_filter(struct ar9170 *ar)
 214 {
 215         int err;
 216
 217         err = ar9170_write_reg(ar, AR9170_MAC_REG_FRAMETYPE_FILTER,
 218                                ar->want_filter);
 219
 220         if (err)
 221                 return err;
 222
 223         ar->cur_filter = ar->want_filter;
 224
 225         return 0;
 226 }
 227
 228 static int ar9170_set_promiscouous(struct ar9170 *ar)
 229 {
 230         u32 encr_mode, sniffer;
 231         int err;
 232
 233         err = ar9170_read_reg(ar, AR9170_MAC_REG_SNIFFER, &sniffer);
 234         if (err)
 235                 return err;
 236
 237         err = ar9170_read_reg(ar, AR9170_MAC_REG_ENCRYPTION, &encr_mode);
 238         if (err)
 239                 return err;
 240
 241         if (ar->sniffer_enabled) {
 242                 sniffer |= AR9170_MAC_REG_SNIFFER_ENABLE_PROMISC;
 243
 244                 /*
 245                  * Rx decryption works in place.
 246                  *
 247                  * If we don't disable it, the hardware will render all
 248                  * encrypted frames which are encrypted with an unknown
 249                  * key useless.
 250                  */
 251
 252                 encr_mode |= AR9170_MAC_REG_ENCRYPTION_RX_SOFTWARE;
 253                 ar->sniffer_enabled = true;
 254         } else {
 255                 sniffer &= ~AR9170_MAC_REG_SNIFFER_ENABLE_PROMISC;
 256
 257                 if (ar->rx_software_decryption)
 258                         encr_mode |= AR9170_MAC_REG_ENCRYPTION_RX_SOFTWARE;
 259                 else
 260                         encr_mode &= ~AR9170_MAC_REG_ENCRYPTION_RX_SOFTWARE;
 261         }
 262
 263         ar9170_regwrite_begin(ar);
 264         ar9170_regwrite(AR9170_MAC_REG_ENCRYPTION, encr_mode);
 265         ar9170_regwrite(AR9170_MAC_REG_SNIFFER, sniffer);
 266         ar9170_regwrite_finish();
 267
 268         return ar9170_regwrite_result();
 269 }
 270
 271 int ar9170_set_operating_mode(struct ar9170 *ar)
 272 {
 273         u32 pm_mode = AR9170_MAC_REG_POWERMGT_DEFAULTS;
 274         u8 *mac_addr, *bssid;
 275         int err;
 276
 277         if (ar->vif) {
 278                 mac_addr = ar->mac_addr;
 279                 bssid = ar->bssid;
 280
 281                 switch (ar->vif->type) {
 282                 case NL80211_IFTYPE_MESH_POINT:
 283                 case NL80211_IFTYPE_ADHOC:
 284                         pm_mode |= AR9170_MAC_REG_POWERMGT_IBSS;
 285                         break;
 286                 case NL80211_IFTYPE_AP:
 287                         pm_mode |= AR9170_MAC_REG_POWERMGT_AP;
 288                         break;
 289                 case NL80211_IFTYPE_WDS:
 290                         pm_mode |= AR9170_MAC_REG_POWERMGT_AP_WDS;
 291                         break;
 292                 case NL80211_IFTYPE_MONITOR:
 293                         ar->sniffer_enabled = true;
 294                         ar->rx_software_decryption = true;
 295                         break;
 296                 default:
 297                         pm_mode |= AR9170_MAC_REG_POWERMGT_STA;
 298                         break;
 299                 }
 300         } else {
 301                 mac_addr = NULL;
 302                 bssid = NULL;
 303         }
 304
 305         err = ar9170_set_mac_reg(ar, AR9170_MAC_REG_MAC_ADDR_L, mac_addr);
 306         if (err)
 307                 return err;
 308
 309         err = ar9170_set_mac_reg(ar, AR9170_MAC_REG_BSSID_L, bssid);
 310         if (err)
 311                 return err;
 312
 313         err = ar9170_set_promiscouous(ar);
 314         if (err)
 315                 return err;
 316
 317         /* set AMPDU density to 8us. */
 318         err = ar9170_set_ampdu_density(ar, 6);
 319         if (err)
 320                 return err;
 321
 322         ar9170_regwrite_begin(ar);
 323
 324         ar9170_regwrite(AR9170_MAC_REG_POWERMANAGEMENT, pm_mode);
 325         ar9170_regwrite_finish();
 326
 327         return ar9170_regwrite_result();
 328 }
 329
 330 int ar9170_set_hwretry_limit(struct ar9170 *ar, unsigned int max_retry)
 331 {
 332         u32 tmp = min_t(u32, 0x33333, max_retry * 0x11111);
 333
 334         return ar9170_write_reg(ar, AR9170_MAC_REG_RETRY_MAX, tmp);
 335 }
 336
 337 int ar9170_set_beacon_timers(struct ar9170 *ar)
 338 {
 339         u32 v = 0;
 340         u32 pretbtt = 0;
 341
 342         if (ar->vif) {
 343                 v |= ar->vif->bss_conf.beacon_int;
 344
 345                 switch (ar->vif->type) {
 346                 case NL80211_IFTYPE_MESH_POINT:
 347                 case NL80211_IFTYPE_ADHOC:
 348                         v |= BIT(25);
 349                         break;
 350                 case NL80211_IFTYPE_AP:
 351                         v |= BIT(24);
 352                         pretbtt = (ar->vif->bss_conf.beacon_int - 6) << 16;
 353                         break;
 354                 default:
 355                         break;
 356                 }
 357
 358                 v |= ar->vif->bss_conf.dtim_period << 16;
 359         }
 360
 361         ar9170_regwrite_begin(ar);
 362
 363         ar9170_regwrite(AR9170_MAC_REG_PRETBTT, pretbtt);
 364         ar9170_regwrite(AR9170_MAC_REG_BCN_PERIOD, v);
 365         ar9170_regwrite_finish();
 366         return ar9170_regwrite_result();
 367 }
 368
 369 int ar9170_update_beacon(struct ar9170 *ar)
 370 {
 371         struct sk_buff *skb;
 372         __le32 *data, *old = NULL;
 373         u32 word;
 374         int i;
 375
 376         skb = ieee80211_beacon_get(ar->hw, ar->vif);
 377         if (!skb)
 378                 return -ENOMEM;
 379
 380         data = (__le32 *)skb->data;
 381         if (ar->beacon)
 382                 old = (__le32 *)ar->beacon->data;
 383
 384         ar9170_regwrite_begin(ar);
 385         for (i = 0; i < DIV_ROUND_UP(skb->len, 4); i++) {
 386                 /*
 387                  * XXX: This accesses beyond skb data for up
 388                  *      to the last 3 bytes!!
 389                  */
 390
 391                 if (old && (data[i] == old[i]))
 392                         continue;
 393
 394                 word = le32_to_cpu(data[i]);
 395                 ar9170_regwrite(AR9170_BEACON_BUFFER_ADDRESS + 4 * i, word);
 396         }
 397
 398         /* XXX: use skb->cb info */
 399         if (ar->hw->conf.channel->band == IEEE80211_BAND_2GHZ)
 400                 ar9170_regwrite(AR9170_MAC_REG_BCN_PLCP,
 401                                 ((skb->len + 4) << (3+16)) + 0x0400);
 402         else
 403                 ar9170_regwrite(AR9170_MAC_REG_BCN_PLCP,
 404                                 ((skb->len + 4) << (3+16)) + 0x0400);
 405
 406         ar9170_regwrite(AR9170_MAC_REG_BCN_LENGTH, skb->len + 4);
 407         ar9170_regwrite(AR9170_MAC_REG_BCN_ADDR, AR9170_BEACON_BUFFER_ADDRESS);
 408         ar9170_regwrite(AR9170_MAC_REG_BCN_CTRL, 1);
 409
 410         ar9170_regwrite_finish();
 411
 412         dev_kfree_skb(ar->beacon);
 413         ar->beacon = skb;
 414
 415         return ar9170_regwrite_result();
 416 }
 417
 418 void ar9170_new_beacon(struct work_struct *work)
 419 {
 420         struct ar9170 *ar = container_of(work, struct ar9170,
 421                                          beacon_work);
 422         struct sk_buff *skb;
 423
 424         if (unlikely(!IS_STARTED(ar)))
 425                 return ;
 426
 427         mutex_lock(&ar->mutex);
 428
 429         if (!ar->vif)
 430                 goto out;
 431
 432         ar9170_update_beacon(ar);
 433
 434         rcu_read_lock();
 435         while ((skb = ieee80211_get_buffered_bc(ar->hw, ar->vif)))
 436                 ar9170_op_tx(ar->hw, skb);
 437
 438         rcu_read_unlock();
 439
 440  out:
 441         mutex_unlock(&ar->mutex);
 442 }
 443
 444 int ar9170_upload_key(struct ar9170 *ar, u8 id, const u8 *mac, u8 ktype,
 445                       u8 keyidx, u8 *keydata, int keylen)
 446 {
 447         __le32 vals[7];
 448         static const u8 bcast[ETH_ALEN] =
 449                 { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff };
 450         u8 dummy;
 451
 452         mac = mac ? : bcast;
 453
 454         vals[0] = cpu_to_le32((keyidx << 16) + id);
 455         vals[1] = cpu_to_le32(mac[1] << 24 | mac[0] << 16 | ktype);
 456         vals[2] = cpu_to_le32(mac[5] << 24 | mac[4] << 16 |
 457                               mac[3] << 8 | mac[2]);
 458         memset(&vals[3], 0, 16);
 459         if (keydata)
 460                 memcpy(&vals[3], keydata, keylen);
 461
 462         return ar->exec_cmd(ar, AR9170_CMD_EKEY,
 463                             sizeof(vals), (u8 *)vals,
 464                             1, &dummy);
 465 }
 466
 467 int ar9170_disable_key(struct ar9170 *ar, u8 id)
 468 {
 469         __le32 val = cpu_to_le32(id);
 470         u8 dummy;
 471
 472         return ar->exec_cmd(ar, AR9170_CMD_EKEY,
 473                             sizeof(val), (u8 *)&val,
 474                             1, &dummy);
 475 }