drivers/net/wireless/iwlegacy/common.c

   1 /******************************************************************************
   2  *
   3  * GPL LICENSE SUMMARY
   4  *
   5  * Copyright(c) 2008 - 2011 Intel Corporation. All rights reserved.
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of version 2 of the GNU General Public License as
   9  * published by the Free Software Foundation.
  10  *
  11  * This program is distributed in the hope that it will be useful, but
  12  * WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14  * General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * along with this program; if not, write to the Free Software
  18  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110,
  19  * USA
  20  *
  21  * The full GNU General Public License is included in this distribution
  22  * in the file called LICENSE.GPL.
  23  *
  24  * Contact Information:
  25  *  Intel Linux Wireless <ilw@linux.intel.com>
  26  * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
  27  *****************************************************************************/
  28
  29 #include <linux/kernel.h>
  30 #include <linux/module.h>
  31 #include <linux/etherdevice.h>
  32 #include <linux/sched.h>
  33 #include <linux/slab.h>
  34 #include <linux/types.h>
  35 #include <linux/lockdep.h>
  36 #include <linux/pci.h>
  37 #include <linux/dma-mapping.h>
  38 #include <linux/delay.h>
  39 #include <linux/skbuff.h>
  40 #include <net/mac80211.h>
  41
  42 #include "common.h"
  43
  44 int
  45 _il_poll_bit(struct il_priv *il, u32 addr, u32 bits, u32 mask, int timeout)
  46 {
  47         const int interval = 10; /* microseconds */
  48         int t = 0;
  49
  50         do {
  51                 if ((_il_rd(il, addr) & mask) == (bits & mask))
  52                         return t;
  53                 udelay(interval);
  54                 t += interval;
  55         } while (t < timeout);
  56
  57         return -ETIMEDOUT;
  58 }
  59 EXPORT_SYMBOL(_il_poll_bit);
  60
  61 void
  62 il_set_bit(struct il_priv *p, u32 r, u32 m)
  63 {
  64         unsigned long reg_flags;
  65
  66         spin_lock_irqsave(&p->reg_lock, reg_flags);
  67         _il_set_bit(p, r, m);
  68         spin_unlock_irqrestore(&p->reg_lock, reg_flags);
  69 }
  70 EXPORT_SYMBOL(il_set_bit);
  71
  72 void
  73 il_clear_bit(struct il_priv *p, u32 r, u32 m)
  74 {
  75         unsigned long reg_flags;
  76
  77         spin_lock_irqsave(&p->reg_lock, reg_flags);
  78         _il_clear_bit(p, r, m);
  79         spin_unlock_irqrestore(&p->reg_lock, reg_flags);
  80 }
  81 EXPORT_SYMBOL(il_clear_bit);
  82
  83 bool
  84 _il_grab_nic_access(struct il_priv *il)
  85 {
  86         int ret;
  87         u32 val;
  88
  89         /* this bit wakes up the NIC */
  90         _il_set_bit(il, CSR_GP_CNTRL, CSR_GP_CNTRL_REG_FLAG_MAC_ACCESS_REQ);
  91
  92         /*
  93          * These bits say the device is running, and should keep running for
  94          * at least a short while (at least as long as MAC_ACCESS_REQ stays 1),
  95          * but they do not indicate that embedded SRAM is restored yet;
  96          * 3945 and 4965 have volatile SRAM, and must save/restore contents
  97          * to/from host DRAM when sleeping/waking for power-saving.
  98          * Each direction takes approximately 1/4 millisecond; with this
  99          * overhead, it's a good idea to grab and hold MAC_ACCESS_REQUEST if a
 100          * series of register accesses are expected (e.g. reading Event Log),
 101          * to keep device from sleeping.
 102          *
 103          * CSR_UCODE_DRV_GP1 register bit MAC_SLEEP == 0 indicates that
 104          * SRAM is okay/restored.  We don't check that here because this call
 105          * is just for hardware register access; but GP1 MAC_SLEEP check is a
 106          * good idea before accessing 3945/4965 SRAM (e.g. reading Event Log).
 107          *
 108          */
 109         ret =
 110             _il_poll_bit(il, CSR_GP_CNTRL, CSR_GP_CNTRL_REG_VAL_MAC_ACCESS_EN,
 111                          (CSR_GP_CNTRL_REG_FLAG_MAC_CLOCK_READY |
 112                           CSR_GP_CNTRL_REG_FLAG_GOING_TO_SLEEP), 15000);
 113         if (unlikely(ret < 0)) {
 114                 val = _il_rd(il, CSR_GP_CNTRL);
 115                 WARN_ONCE(1, "Timeout waiting for ucode processor access "
 116                              "(CSR_GP_CNTRL 0x%08x)\n", val);
 117                 _il_wr(il, CSR_RESET, CSR_RESET_REG_FLAG_FORCE_NMI);
 118                 return false;
 119         }
 120
 121         return true;
 122 }
 123 EXPORT_SYMBOL_GPL(_il_grab_nic_access);
 124
 125 int
 126 il_poll_bit(struct il_priv *il, u32 addr, u32 mask, int timeout)
 127 {
 128         const int interval = 10; /* microseconds */
 129         int t = 0;
 130
 131         do {
 132                 if ((il_rd(il, addr) & mask) == mask)
 133                         return t;
 134                 udelay(interval);
 135                 t += interval;
 136         } while (t < timeout);
 137
 138         return -ETIMEDOUT;
 139 }
 140 EXPORT_SYMBOL(il_poll_bit);
 141
 142 u32
 143 il_rd_prph(struct il_priv *il, u32 reg)
 144 {
 145         unsigned long reg_flags;
 146         u32 val;
 147
 148         spin_lock_irqsave(&il->reg_lock, reg_flags);
 149         _il_grab_nic_access(il);
 150         val = _il_rd_prph(il, reg);
 151         _il_release_nic_access(il);
 152         spin_unlock_irqrestore(&il->reg_lock, reg_flags);
 153         return val;
 154 }
 155 EXPORT_SYMBOL(il_rd_prph);
 156
 157 void
 158 il_wr_prph(struct il_priv *il, u32 addr, u32 val)
 159 {
 160         unsigned long reg_flags;
 161
 162         spin_lock_irqsave(&il->reg_lock, reg_flags);
 163         if (likely(_il_grab_nic_access(il))) {
 164                 _il_wr_prph(il, addr, val);
 165                 _il_release_nic_access(il);
 166         }
 167         spin_unlock_irqrestore(&il->reg_lock, reg_flags);
 168 }
 169 EXPORT_SYMBOL(il_wr_prph);
 170
 171 u32
 172 il_read_targ_mem(struct il_priv *il, u32 addr)
 173 {
 174         unsigned long reg_flags;
 175         u32 value;
 176
 177         spin_lock_irqsave(&il->reg_lock, reg_flags);
 178         _il_grab_nic_access(il);
 179
 180         _il_wr(il, HBUS_TARG_MEM_RADDR, addr);
 181         value = _il_rd(il, HBUS_TARG_MEM_RDAT);
 182
 183         _il_release_nic_access(il);
 184         spin_unlock_irqrestore(&il->reg_lock, reg_flags);
 185         return value;
 186 }
 187 EXPORT_SYMBOL(il_read_targ_mem);
 188
 189 void
 190 il_write_targ_mem(struct il_priv *il, u32 addr, u32 val)
 191 {
 192         unsigned long reg_flags;
 193
 194         spin_lock_irqsave(&il->reg_lock, reg_flags);
 195         if (likely(_il_grab_nic_access(il))) {
 196                 _il_wr(il, HBUS_TARG_MEM_WADDR, addr);
 197                 _il_wr(il, HBUS_TARG_MEM_WDAT, val);
 198                 _il_release_nic_access(il);
 199         }
 200         spin_unlock_irqrestore(&il->reg_lock, reg_flags);
 201 }
 202 EXPORT_SYMBOL(il_write_targ_mem);
 203
 204 const char *
 205 il_get_cmd_string(u8 cmd)
 206 {
 207         switch (cmd) {
 208                 IL_CMD(N_ALIVE);
 209                 IL_CMD(N_ERROR);
 210                 IL_CMD(C_RXON);
 211                 IL_CMD(C_RXON_ASSOC);
 212                 IL_CMD(C_QOS_PARAM);
 213                 IL_CMD(C_RXON_TIMING);
 214                 IL_CMD(C_ADD_STA);
 215                 IL_CMD(C_REM_STA);
 216                 IL_CMD(C_WEPKEY);
 217                 IL_CMD(N_3945_RX);
 218                 IL_CMD(C_TX);
 219                 IL_CMD(C_RATE_SCALE);
 220                 IL_CMD(C_LEDS);
 221                 IL_CMD(C_TX_LINK_QUALITY_CMD);
 222                 IL_CMD(C_CHANNEL_SWITCH);
 223                 IL_CMD(N_CHANNEL_SWITCH);
 224                 IL_CMD(C_SPECTRUM_MEASUREMENT);
 225                 IL_CMD(N_SPECTRUM_MEASUREMENT);
 226                 IL_CMD(C_POWER_TBL);
 227                 IL_CMD(N_PM_SLEEP);
 228                 IL_CMD(N_PM_DEBUG_STATS);
 229                 IL_CMD(C_SCAN);
 230                 IL_CMD(C_SCAN_ABORT);
 231                 IL_CMD(N_SCAN_START);
 232                 IL_CMD(N_SCAN_RESULTS);
 233                 IL_CMD(N_SCAN_COMPLETE);
 234                 IL_CMD(N_BEACON);
 235                 IL_CMD(C_TX_BEACON);
 236                 IL_CMD(C_TX_PWR_TBL);
 237                 IL_CMD(C_BT_CONFIG);
 238                 IL_CMD(C_STATS);
 239                 IL_CMD(N_STATS);
 240                 IL_CMD(N_CARD_STATE);
 241                 IL_CMD(N_MISSED_BEACONS);
 242                 IL_CMD(C_CT_KILL_CONFIG);
 243                 IL_CMD(C_SENSITIVITY);
 244                 IL_CMD(C_PHY_CALIBRATION);
 245                 IL_CMD(N_RX_PHY);
 246                 IL_CMD(N_RX_MPDU);
 247                 IL_CMD(N_RX);
 248                 IL_CMD(N_COMPRESSED_BA);
 249         default:
 250                 return "UNKNOWN";
 251
 252         }
 253 }
 254 EXPORT_SYMBOL(il_get_cmd_string);
 255
 256 #define HOST_COMPLETE_TIMEOUT (HZ / 2)
 257
 258 static void
 259 il_generic_cmd_callback(struct il_priv *il, struct il_device_cmd *cmd,
 260                         struct il_rx_pkt *pkt)
 261 {
 262         if (pkt->hdr.flags & IL_CMD_FAILED_MSK) {
 263                 IL_ERR("Bad return from %s (0x%08X)\n",
 264                        il_get_cmd_string(cmd->hdr.cmd), pkt->hdr.flags);
 265                 return;
 266         }
 267 #ifdef CONFIG_IWLEGACY_DEBUG
 268         switch (cmd->hdr.cmd) {
 269         case C_TX_LINK_QUALITY_CMD:
 270         case C_SENSITIVITY:
 271                 D_HC_DUMP("back from %s (0x%08X)\n",
 272                           il_get_cmd_string(cmd->hdr.cmd), pkt->hdr.flags);
 273                 break;
 274         default:
 275                 D_HC("back from %s (0x%08X)\n", il_get_cmd_string(cmd->hdr.cmd),
 276                      pkt->hdr.flags);
 277         }
 278 #endif
 279 }
 280
 281 static int
 282 il_send_cmd_async(struct il_priv *il, struct il_host_cmd *cmd)
 283 {
 284         int ret;
 285
 286         BUG_ON(!(cmd->flags & CMD_ASYNC));
 287
 288         /* An asynchronous command can not expect an SKB to be set. */
 289         BUG_ON(cmd->flags & CMD_WANT_SKB);
 290
 291         /* Assign a generic callback if one is not provided */
 292         if (!cmd->callback)
 293                 cmd->callback = il_generic_cmd_callback;
 294
 295         if (test_bit(S_EXIT_PENDING, &il->status))
 296                 return -EBUSY;
 297
 298         ret = il_enqueue_hcmd(il, cmd);
 299         if (ret < 0) {
 300                 IL_ERR("Error sending %s: enqueue_hcmd failed: %d\n",
 301                        il_get_cmd_string(cmd->id), ret);
 302                 return ret;
 303         }
 304         return 0;
 305 }
 306
 307 int
 308 il_send_cmd_sync(struct il_priv *il, struct il_host_cmd *cmd)
 309 {
 310         int cmd_idx;
 311         int ret;
 312
 313         lockdep_assert_held(&il->mutex);
 314
 315         BUG_ON(cmd->flags & CMD_ASYNC);
 316
 317         /* A synchronous command can not have a callback set. */
 318         BUG_ON(cmd->callback);
 319
 320         D_INFO("Attempting to send sync command %s\n",
 321                il_get_cmd_string(cmd->id));
 322
 323         set_bit(S_HCMD_ACTIVE, &il->status);
 324         D_INFO("Setting HCMD_ACTIVE for command %s\n",
 325                il_get_cmd_string(cmd->id));
 326
 327         cmd_idx = il_enqueue_hcmd(il, cmd);
 328         if (cmd_idx < 0) {
 329                 ret = cmd_idx;
 330                 IL_ERR("Error sending %s: enqueue_hcmd failed: %d\n",
 331                        il_get_cmd_string(cmd->id), ret);
 332                 goto out;
 333         }
 334
 335         ret = wait_event_timeout(il->wait_command_queue,
 336                                  !test_bit(S_HCMD_ACTIVE, &il->status),
 337                                  HOST_COMPLETE_TIMEOUT);
 338         if (!ret) {
 339                 if (test_bit(S_HCMD_ACTIVE, &il->status)) {
 340                         IL_ERR("Error sending %s: time out after %dms.\n",
 341                                il_get_cmd_string(cmd->id),
 342                                jiffies_to_msecs(HOST_COMPLETE_TIMEOUT));
 343
 344                         clear_bit(S_HCMD_ACTIVE, &il->status);
 345                         D_INFO("Clearing HCMD_ACTIVE for command %s\n",
 346                                il_get_cmd_string(cmd->id));
 347                         ret = -ETIMEDOUT;
 348                         goto cancel;
 349                 }
 350         }
 351
 352         if (test_bit(S_RFKILL, &il->status)) {
 353                 IL_ERR("Command %s aborted: RF KILL Switch\n",
 354                        il_get_cmd_string(cmd->id));
 355                 ret = -ECANCELED;
 356                 goto fail;
 357         }
 358         if (test_bit(S_FW_ERROR, &il->status)) {
 359                 IL_ERR("Command %s failed: FW Error\n",
 360                        il_get_cmd_string(cmd->id));
 361                 ret = -EIO;
 362                 goto fail;
 363         }
 364         if ((cmd->flags & CMD_WANT_SKB) && !cmd->reply_page) {
 365                 IL_ERR("Error: Response NULL in '%s'\n",
 366                        il_get_cmd_string(cmd->id));
 367                 ret = -EIO;
 368                 goto cancel;
 369         }
 370
 371         ret = 0;
 372         goto out;
 373
 374 cancel:
 375         if (cmd->flags & CMD_WANT_SKB) {
 376                 /*
 377                  * Cancel the CMD_WANT_SKB flag for the cmd in the
 378                  * TX cmd queue. Otherwise in case the cmd comes
 379                  * in later, it will possibly set an invalid
 380                  * address (cmd->meta.source).
 381                  */
 382                 il->txq[il->cmd_queue].meta[cmd_idx].flags &= ~CMD_WANT_SKB;
 383         }
 384 fail:
 385         if (cmd->reply_page) {
 386                 il_free_pages(il, cmd->reply_page);
 387                 cmd->reply_page = 0;
 388         }
 389 out:
 390         return ret;
 391 }
 392 EXPORT_SYMBOL(il_send_cmd_sync);
 393
 394 int
 395 il_send_cmd(struct il_priv *il, struct il_host_cmd *cmd)
 396 {
 397         if (cmd->flags & CMD_ASYNC)
 398                 return il_send_cmd_async(il, cmd);
 399
 400         return il_send_cmd_sync(il, cmd);
 401 }
 402 EXPORT_SYMBOL(il_send_cmd);
 403
 404 int
 405 il_send_cmd_pdu(struct il_priv *il, u8 id, u16 len, const void *data)
 406 {
 407         struct il_host_cmd cmd = {
 408                 .id = id,
 409                 .len = len,
 410                 .data = data,
 411         };
 412
 413         return il_send_cmd_sync(il, &cmd);
 414 }
 415 EXPORT_SYMBOL(il_send_cmd_pdu);
 416
 417 int
 418 il_send_cmd_pdu_async(struct il_priv *il, u8 id, u16 len, const void *data,
 419                       void (*callback) (struct il_priv *il,
 420                                         struct il_device_cmd *cmd,
 421                                         struct il_rx_pkt *pkt))
 422 {
 423         struct il_host_cmd cmd = {
 424                 .id = id,
 425                 .len = len,
 426                 .data = data,
 427         };
 428
 429         cmd.flags |= CMD_ASYNC;
 430         cmd.callback = callback;
 431
 432         return il_send_cmd_async(il, &cmd);
 433 }
 434 EXPORT_SYMBOL(il_send_cmd_pdu_async);
 435
 436 /* default: IL_LED_BLINK(0) using blinking idx table */
 437 static int led_mode;
 438 module_param(led_mode, int, S_IRUGO);
 439 MODULE_PARM_DESC(led_mode,
 440                  "0=system default, " "1=On(RF On)/Off(RF Off), 2=blinking");
 441
 442 /* Throughput           OFF time(ms)    ON time (ms)
 443  *      >300                    25              25
 444  *      >200 to 300             40              40
 445  *      >100 to 200             55              55
 446  *      >70 to 100              65              65
 447  *      >50 to 70               75              75
 448  *      >20 to 50               85              85
 449  *      >10 to 20               95              95
 450  *      >5 to 10                110             110
 451  *      >1 to 5                 130             130
 452  *      >0 to 1                 167             167
 453  *      <=0                                     SOLID ON
 454  */
 455 static const struct ieee80211_tpt_blink il_blink[] = {
 456         {.throughput = 0,               .blink_time = 334},
 457         {.throughput = 1 * 1024 - 1,    .blink_time = 260},
 458         {.throughput = 5 * 1024 - 1,    .blink_time = 220},
 459         {.throughput = 10 * 1024 - 1,   .blink_time = 190},
 460         {.throughput = 20 * 1024 - 1,   .blink_time = 170},
 461         {.throughput = 50 * 1024 - 1,   .blink_time = 150},
 462         {.throughput = 70 * 1024 - 1,   .blink_time = 130},
 463         {.throughput = 100 * 1024 - 1,  .blink_time = 110},
 464         {.throughput = 200 * 1024 - 1,  .blink_time = 80},
 465         {.throughput = 300 * 1024 - 1,  .blink_time = 50},
 466 };
 467
 468 /*
 469  * Adjust led blink rate to compensate on a MAC Clock difference on every HW
 470  * Led blink rate analysis showed an average deviation of 0% on 3945,
 471  * 5% on 4965 HW.
 472  * Need to compensate on the led on/off time per HW according to the deviation
 473  * to achieve the desired led frequency
 474  * The calculation is: (100-averageDeviation)/100 * blinkTime
 475  * For code efficiency the calculation will be:
 476  *     compensation = (100 - averageDeviation) * 64 / 100
 477  *     NewBlinkTime = (compensation * BlinkTime) / 64
 478  */
 479 static inline u8
 480 il_blink_compensation(struct il_priv *il, u8 time, u16 compensation)
 481 {
 482         if (!compensation) {
 483                 IL_ERR("undefined blink compensation: "
 484                        "use pre-defined blinking time\n");
 485                 return time;
 486         }
 487
 488         return (u8) ((time * compensation) >> 6);
 489 }
 490
 491 /* Set led pattern command */
 492 static int
 493 il_led_cmd(struct il_priv *il, unsigned long on, unsigned long off)
 494 {
 495         struct il_led_cmd led_cmd = {
 496                 .id = IL_LED_LINK,
 497                 .interval = IL_DEF_LED_INTRVL
 498         };
 499         int ret;
 500
 501         if (!test_bit(S_READY, &il->status))
 502                 return -EBUSY;
 503
 504         if (il->blink_on == on && il->blink_off == off)
 505                 return 0;
 506
 507         if (off == 0) {
 508                 /* led is SOLID_ON */
 509                 on = IL_LED_SOLID;
 510         }
 511
 512         D_LED("Led blink time compensation=%u\n",
 513               il->cfg->led_compensation);
 514         led_cmd.on =
 515             il_blink_compensation(il, on,
 516                                   il->cfg->led_compensation);
 517         led_cmd.off =
 518             il_blink_compensation(il, off,
 519                                   il->cfg->led_compensation);
 520
 521         ret = il->ops->send_led_cmd(il, &led_cmd);
 522         if (!ret) {
 523                 il->blink_on = on;
 524                 il->blink_off = off;
 525         }
 526         return ret;
 527 }
 528
 529 static void
 530 il_led_brightness_set(struct led_classdev *led_cdev,
 531                       enum led_brightness brightness)
 532 {
 533         struct il_priv *il = container_of(led_cdev, struct il_priv, led);
 534         unsigned long on = 0;
 535
 536         if (brightness > 0)
 537                 on = IL_LED_SOLID;
 538
 539         il_led_cmd(il, on, 0);
 540 }
 541
 542 static int
 543 il_led_blink_set(struct led_classdev *led_cdev, unsigned long *delay_on,
 544                  unsigned long *delay_off)
 545 {
 546         struct il_priv *il = container_of(led_cdev, struct il_priv, led);
 547
 548         return il_led_cmd(il, *delay_on, *delay_off);
 549 }
 550
 551 void
 552 il_leds_init(struct il_priv *il)
 553 {
 554         int mode = led_mode;
 555         int ret;
 556
 557         if (mode == IL_LED_DEFAULT)
 558                 mode = il->cfg->led_mode;
 559
 560         il->led.name =
 561             kasprintf(GFP_KERNEL, "%s-led", wiphy_name(il->hw->wiphy));
 562         il->led.brightness_set = il_led_brightness_set;
 563         il->led.blink_set = il_led_blink_set;
 564         il->led.max_brightness = 1;
 565
 566         switch (mode) {
 567         case IL_LED_DEFAULT:
 568                 WARN_ON(1);
 569                 break;
 570         case IL_LED_BLINK:
 571                 il->led.default_trigger =
 572                     ieee80211_create_tpt_led_trigger(il->hw,
 573                                                      IEEE80211_TPT_LEDTRIG_FL_CONNECTED,
 574                                                      il_blink,
 575                                                      ARRAY_SIZE(il_blink));
 576                 break;
 577         case IL_LED_RF_STATE:
 578                 il->led.default_trigger = ieee80211_get_radio_led_name(il->hw);
 579                 break;
 580         }
 581
 582         ret = led_classdev_register(&il->pci_dev->dev, &il->led);
 583         if (ret) {
 584                 kfree(il->led.name);
 585                 return;
 586         }
 587
 588         il->led_registered = true;
 589 }
 590 EXPORT_SYMBOL(il_leds_init);
 591
 592 void
 593 il_leds_exit(struct il_priv *il)
 594 {
 595         if (!il->led_registered)
 596                 return;
 597
 598         led_classdev_unregister(&il->led);
 599         kfree(il->led.name);
 600 }
 601 EXPORT_SYMBOL(il_leds_exit);
 602
 603 /************************** EEPROM BANDS ****************************
 604  *
 605  * The il_eeprom_band definitions below provide the mapping from the
 606  * EEPROM contents to the specific channel number supported for each
 607  * band.
 608  *
 609  * For example, il_priv->eeprom.band_3_channels[4] from the band_3
 610  * definition below maps to physical channel 42 in the 5.2GHz spectrum.
 611  * The specific geography and calibration information for that channel
 612  * is contained in the eeprom map itself.
 613  *
 614  * During init, we copy the eeprom information and channel map
 615  * information into il->channel_info_24/52 and il->channel_map_24/52
 616  *
 617  * channel_map_24/52 provides the idx in the channel_info array for a
 618  * given channel.  We have to have two separate maps as there is channel
 619  * overlap with the 2.4GHz and 5.2GHz spectrum as seen in band_1 and
 620  * band_2
 621  *
 622  * A value of 0xff stored in the channel_map indicates that the channel
 623  * is not supported by the hardware at all.
 624  *
 625  * A value of 0xfe in the channel_map indicates that the channel is not
 626  * valid for Tx with the current hardware.  This means that
 627  * while the system can tune and receive on a given channel, it may not
 628  * be able to associate or transmit any frames on that
 629  * channel.  There is no corresponding channel information for that
 630  * entry.
 631  *
 632  *********************************************************************/
 633
 634 /* 2.4 GHz */
 635 const u8 il_eeprom_band_1[14] = {
 636         1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14
 637 };
 638
 639 /* 5.2 GHz bands */
 640 static const u8 il_eeprom_band_2[] = {  /* 4915-5080MHz */
 641         183, 184, 185, 187, 188, 189, 192, 196, 7, 8, 11, 12, 16
 642 };
 643
 644 static const u8 il_eeprom_band_3[] = {  /* 5170-5320MHz */
 645         34, 36, 38, 40, 42, 44, 46, 48, 52, 56, 60, 64
 646 };
 647
 648 static const u8 il_eeprom_band_4[] = {  /* 5500-5700MHz */
 649         100, 104, 108, 112, 116, 120, 124, 128, 132, 136, 140
 650 };
 651
 652 static const u8 il_eeprom_band_5[] = {  /* 5725-5825MHz */
 653         145, 149, 153, 157, 161, 165
 654 };
 655
 656 static const u8 il_eeprom_band_6[] = {  /* 2.4 ht40 channel */
 657         1, 2, 3, 4, 5, 6, 7
 658 };
 659
 660 static const u8 il_eeprom_band_7[] = {  /* 5.2 ht40 channel */
 661         36, 44, 52, 60, 100, 108, 116, 124, 132, 149, 157
 662 };
 663
 664 /******************************************************************************
 665  *
 666  * EEPROM related functions
 667  *
 668 ******************************************************************************/
 669
 670 static int
 671 il_eeprom_verify_signature(struct il_priv *il)
 672 {
 673         u32 gp = _il_rd(il, CSR_EEPROM_GP) & CSR_EEPROM_GP_VALID_MSK;
 674         int ret = 0;
 675
 676         D_EEPROM("EEPROM signature=0x%08x\n", gp);
 677         switch (gp) {
 678         case CSR_EEPROM_GP_GOOD_SIG_EEP_LESS_THAN_4K:
 679         case CSR_EEPROM_GP_GOOD_SIG_EEP_MORE_THAN_4K:
 680                 break;
 681         default:
 682                 IL_ERR("bad EEPROM signature," "EEPROM_GP=0x%08x\n", gp);
 683                 ret = -ENOENT;
 684                 break;
 685         }
 686         return ret;
 687 }
 688
 689 const u8 *
 690 il_eeprom_query_addr(const struct il_priv *il, size_t offset)
 691 {
 692         BUG_ON(offset >= il->cfg->eeprom_size);
 693         return &il->eeprom[offset];
 694 }
 695 EXPORT_SYMBOL(il_eeprom_query_addr);
 696
 697 u16
 698 il_eeprom_query16(const struct il_priv *il, size_t offset)
 699 {
 700         if (!il->eeprom)
 701                 return 0;
 702         return (u16) il->eeprom[offset] | ((u16) il->eeprom[offset + 1] << 8);
 703 }
 704 EXPORT_SYMBOL(il_eeprom_query16);
 705
 706 /**
 707  * il_eeprom_init - read EEPROM contents
 708  *
 709  * Load the EEPROM contents from adapter into il->eeprom
 710  *
 711  * NOTE:  This routine uses the non-debug IO access functions.
 712  */
 713 int
 714 il_eeprom_init(struct il_priv *il)
 715 {
 716         __le16 *e;
 717         u32 gp = _il_rd(il, CSR_EEPROM_GP);
 718         int sz;
 719         int ret;
 720         u16 addr;
 721
 722         /* allocate eeprom */
 723         sz = il->cfg->eeprom_size;
 724         D_EEPROM("NVM size = %d\n", sz);
 725         il->eeprom = kzalloc(sz, GFP_KERNEL);
 726         if (!il->eeprom) {
 727                 ret = -ENOMEM;
 728                 goto alloc_err;
 729         }
 730         e = (__le16 *) il->eeprom;
 731
 732         il->ops->apm_init(il);
 733
 734         ret = il_eeprom_verify_signature(il);
 735         if (ret < 0) {
 736                 IL_ERR("EEPROM not found, EEPROM_GP=0x%08x\n", gp);
 737                 ret = -ENOENT;
 738                 goto err;
 739         }
 740
 741         /* Make sure driver (instead of uCode) is allowed to read EEPROM */
 742         ret = il->ops->eeprom_acquire_semaphore(il);
 743         if (ret < 0) {
 744                 IL_ERR("Failed to acquire EEPROM semaphore.\n");
 745                 ret = -ENOENT;
 746                 goto err;
 747         }
 748
 749         /* eeprom is an array of 16bit values */
 750         for (addr = 0; addr < sz; addr += sizeof(u16)) {
 751                 u32 r;
 752
 753                 _il_wr(il, CSR_EEPROM_REG,
 754                        CSR_EEPROM_REG_MSK_ADDR & (addr << 1));
 755
 756                 ret =
 757                     _il_poll_bit(il, CSR_EEPROM_REG,
 758                                  CSR_EEPROM_REG_READ_VALID_MSK,
 759                                  CSR_EEPROM_REG_READ_VALID_MSK,
 760                                  IL_EEPROM_ACCESS_TIMEOUT);
 761                 if (ret < 0) {
 762                         IL_ERR("Time out reading EEPROM[%d]\n", addr);
 763                         goto done;
 764                 }
 765                 r = _il_rd(il, CSR_EEPROM_REG);
 766                 e[addr / 2] = cpu_to_le16(r >> 16);
 767         }
 768
 769         D_EEPROM("NVM Type: %s, version: 0x%x\n", "EEPROM",
 770                  il_eeprom_query16(il, EEPROM_VERSION));
 771
 772         ret = 0;
 773 done:
 774         il->ops->eeprom_release_semaphore(il);
 775
 776 err:
 777         if (ret)
 778                 il_eeprom_free(il);
 779         /* Reset chip to save power until we load uCode during "up". */
 780         il_apm_stop(il);
 781 alloc_err:
 782         return ret;
 783 }
 784 EXPORT_SYMBOL(il_eeprom_init);
 785
 786 void
 787 il_eeprom_free(struct il_priv *il)
 788 {
 789         kfree(il->eeprom);
 790         il->eeprom = NULL;
 791 }
 792 EXPORT_SYMBOL(il_eeprom_free);
 793
 794 static void
 795 il_init_band_reference(const struct il_priv *il, int eep_band,
 796                        int *eeprom_ch_count,
 797                        const struct il_eeprom_channel **eeprom_ch_info,
 798                        const u8 **eeprom_ch_idx)
 799 {
 800         u32 offset = il->cfg->regulatory_bands[eep_band - 1];
 801
 802         switch (eep_band) {
 803         case 1:         /* 2.4GHz band */
 804                 *eeprom_ch_count = ARRAY_SIZE(il_eeprom_band_1);
 805                 *eeprom_ch_info =
 806                     (struct il_eeprom_channel *)il_eeprom_query_addr(il,
 807                                                                      offset);
 808                 *eeprom_ch_idx = il_eeprom_band_1;
 809                 break;
 810         case 2:         /* 4.9GHz band */
 811                 *eeprom_ch_count = ARRAY_SIZE(il_eeprom_band_2);
 812                 *eeprom_ch_info =
 813                     (struct il_eeprom_channel *)il_eeprom_query_addr(il,
 814                                                                      offset);
 815                 *eeprom_ch_idx = il_eeprom_band_2;
 816                 break;
 817         case 3:         /* 5.2GHz band */
 818                 *eeprom_ch_count = ARRAY_SIZE(il_eeprom_band_3);
 819                 *eeprom_ch_info =
 820                     (struct il_eeprom_channel *)il_eeprom_query_addr(il,
 821                                                                      offset);
 822                 *eeprom_ch_idx = il_eeprom_band_3;
 823                 break;
 824         case 4:         /* 5.5GHz band */
 825                 *eeprom_ch_count = ARRAY_SIZE(il_eeprom_band_4);
 826                 *eeprom_ch_info =
 827                     (struct il_eeprom_channel *)il_eeprom_query_addr(il,
 828                                                                      offset);
 829                 *eeprom_ch_idx = il_eeprom_band_4;
 830                 break;
 831         case 5:         /* 5.7GHz band */
 832                 *eeprom_ch_count = ARRAY_SIZE(il_eeprom_band_5);
 833                 *eeprom_ch_info =
 834                     (struct il_eeprom_channel *)il_eeprom_query_addr(il,
 835                                                                      offset);
 836                 *eeprom_ch_idx = il_eeprom_band_5;
 837                 break;
 838         case 6:         /* 2.4GHz ht40 channels */
 839                 *eeprom_ch_count = ARRAY_SIZE(il_eeprom_band_6);
 840                 *eeprom_ch_info =
 841                     (struct il_eeprom_channel *)il_eeprom_query_addr(il,
 842                                                                      offset);
 843                 *eeprom_ch_idx = il_eeprom_band_6;
 844                 break;
 845         case 7:         /* 5 GHz ht40 channels */
 846                 *eeprom_ch_count = ARRAY_SIZE(il_eeprom_band_7);
 847                 *eeprom_ch_info =
 848                     (struct il_eeprom_channel *)il_eeprom_query_addr(il,
 849                                                                      offset);
 850                 *eeprom_ch_idx = il_eeprom_band_7;
 851                 break;
 852         default:
 853                 BUG();
 854         }
 855 }
 856
 857 #define CHECK_AND_PRINT(x) ((eeprom_ch->flags & EEPROM_CHANNEL_##x) \
 858                             ? # x " " : "")
 859 /**
 860  * il_mod_ht40_chan_info - Copy ht40 channel info into driver's il.
 861  *
 862  * Does not set up a command, or touch hardware.
 863  */
 864 static int
 865 il_mod_ht40_chan_info(struct il_priv *il, enum ieee80211_band band, u16 channel,
 866                       const struct il_eeprom_channel *eeprom_ch,
 867                       u8 clear_ht40_extension_channel)
 868 {
 869         struct il_channel_info *ch_info;
 870
 871         ch_info =
 872             (struct il_channel_info *)il_get_channel_info(il, band, channel);
 873
 874         if (!il_is_channel_valid(ch_info))
 875                 return -1;
 876
 877         D_EEPROM("HT40 Ch. %d [%sGHz] %s%s%s%s%s(0x%02x %ddBm):"
 878                  " Ad-Hoc %ssupported\n", ch_info->channel,
 879                  il_is_channel_a_band(ch_info) ? "5.2" : "2.4",
 880                  CHECK_AND_PRINT(IBSS), CHECK_AND_PRINT(ACTIVE),
 881                  CHECK_AND_PRINT(RADAR), CHECK_AND_PRINT(WIDE),
 882                  CHECK_AND_PRINT(DFS), eeprom_ch->flags,
 883                  eeprom_ch->max_power_avg,
 884                  ((eeprom_ch->flags & EEPROM_CHANNEL_IBSS) &&
 885                   !(eeprom_ch->flags & EEPROM_CHANNEL_RADAR)) ? "" : "not ");
 886
 887         ch_info->ht40_eeprom = *eeprom_ch;
 888         ch_info->ht40_max_power_avg = eeprom_ch->max_power_avg;
 889         ch_info->ht40_flags = eeprom_ch->flags;
 890         if (eeprom_ch->flags & EEPROM_CHANNEL_VALID)
 891                 ch_info->ht40_extension_channel &=
 892                     ~clear_ht40_extension_channel;
 893
 894         return 0;
 895 }
 896
 897 #define CHECK_AND_PRINT_I(x) ((eeprom_ch_info[ch].flags & EEPROM_CHANNEL_##x) \
 898                             ? # x " " : "")
 899
 900 /**
 901  * il_init_channel_map - Set up driver's info for all possible channels
 902  */
 903 int
 904 il_init_channel_map(struct il_priv *il)
 905 {
 906         int eeprom_ch_count = 0;
 907         const u8 *eeprom_ch_idx = NULL;
 908         const struct il_eeprom_channel *eeprom_ch_info = NULL;
 909         int band, ch;
 910         struct il_channel_info *ch_info;
 911
 912         if (il->channel_count) {
 913                 D_EEPROM("Channel map already initialized.\n");
 914                 return 0;
 915         }
 916
 917         D_EEPROM("Initializing regulatory info from EEPROM\n");
 918
 919         il->channel_count =
 920             ARRAY_SIZE(il_eeprom_band_1) + ARRAY_SIZE(il_eeprom_band_2) +
 921             ARRAY_SIZE(il_eeprom_band_3) + ARRAY_SIZE(il_eeprom_band_4) +
 922             ARRAY_SIZE(il_eeprom_band_5);
 923
 924         D_EEPROM("Parsing data for %d channels.\n", il->channel_count);
 925
 926         il->channel_info =
 927             kzalloc(sizeof(struct il_channel_info) * il->channel_count,
 928                     GFP_KERNEL);
 929         if (!il->channel_info) {
 930                 IL_ERR("Could not allocate channel_info\n");
 931                 il->channel_count = 0;
 932                 return -ENOMEM;
 933         }
 934
 935         ch_info = il->channel_info;
 936
 937         /* Loop through the 5 EEPROM bands adding them in order to the
 938          * channel map we maintain (that contains additional information than
 939          * what just in the EEPROM) */
 940         for (band = 1; band <= 5; band++) {
 941
 942                 il_init_band_reference(il, band, &eeprom_ch_count,
 943                                        &eeprom_ch_info, &eeprom_ch_idx);
 944
 945                 /* Loop through each band adding each of the channels */
 946                 for (ch = 0; ch < eeprom_ch_count; ch++) {
 947                         ch_info->channel = eeprom_ch_idx[ch];
 948                         ch_info->band =
 949                             (band ==
 950                              1) ? IEEE80211_BAND_2GHZ : IEEE80211_BAND_5GHZ;
 951
 952                         /* permanently store EEPROM's channel regulatory flags
 953                          *   and max power in channel info database. */
 954                         ch_info->eeprom = eeprom_ch_info[ch];
 955
 956                         /* Copy the run-time flags so they are there even on
 957                          * invalid channels */
 958                         ch_info->flags = eeprom_ch_info[ch].flags;
 959                         /* First write that ht40 is not enabled, and then enable
 960                          * one by one */
 961                         ch_info->ht40_extension_channel =
 962                             IEEE80211_CHAN_NO_HT40;
 963
 964                         if (!(il_is_channel_valid(ch_info))) {
 965                                 D_EEPROM("Ch. %d Flags %x [%sGHz] - "
 966                                          "No traffic\n", ch_info->channel,
 967                                          ch_info->flags,
 968                                          il_is_channel_a_band(ch_info) ? "5.2" :
 969                                          "2.4");
 970                                 ch_info++;
 971                                 continue;
 972                         }
 973
 974                         /* Initialize regulatory-based run-time data */
 975                         ch_info->max_power_avg = ch_info->curr_txpow =
 976                             eeprom_ch_info[ch].max_power_avg;
 977                         ch_info->scan_power = eeprom_ch_info[ch].max_power_avg;
 978                         ch_info->min_power = 0;
 979
 980                         D_EEPROM("Ch. %d [%sGHz] " "%s%s%s%s%s%s(0x%02x %ddBm):"
 981                                  " Ad-Hoc %ssupported\n", ch_info->channel,
 982                                  il_is_channel_a_band(ch_info) ? "5.2" : "2.4",
 983                                  CHECK_AND_PRINT_I(VALID),
 984                                  CHECK_AND_PRINT_I(IBSS),
 985                                  CHECK_AND_PRINT_I(ACTIVE),
 986                                  CHECK_AND_PRINT_I(RADAR),
 987                                  CHECK_AND_PRINT_I(WIDE),
 988                                  CHECK_AND_PRINT_I(DFS),
 989                                  eeprom_ch_info[ch].flags,
 990                                  eeprom_ch_info[ch].max_power_avg,
 991                                  ((eeprom_ch_info[ch].
 992                                    flags & EEPROM_CHANNEL_IBSS) &&
 993                                   !(eeprom_ch_info[ch].
 994                                     flags & EEPROM_CHANNEL_RADAR)) ? "" :
 995                                  "not ");
 996
 997                         ch_info++;
 998                 }
 999         }
1000
1001         /* Check if we do have HT40 channels */
1002         if (il->cfg->regulatory_bands[5] == EEPROM_REGULATORY_BAND_NO_HT40 &&
1003             il->cfg->regulatory_bands[6] == EEPROM_REGULATORY_BAND_NO_HT40)
1004                 return 0;
1005
1006         /* Two additional EEPROM bands for 2.4 and 5 GHz HT40 channels */
1007         for (band = 6; band <= 7; band++) {
1008                 enum ieee80211_band ieeeband;
1009
1010                 il_init_band_reference(il, band, &eeprom_ch_count,
1011                                        &eeprom_ch_info, &eeprom_ch_idx);
1012
1013                 /* EEPROM band 6 is 2.4, band 7 is 5 GHz */
1014                 ieeeband =
1015                     (band == 6) ? IEEE80211_BAND_2GHZ : IEEE80211_BAND_5GHZ;
1016
1017                 /* Loop through each band adding each of the channels */
1018                 for (ch = 0; ch < eeprom_ch_count; ch++) {
1019                         /* Set up driver's info for lower half */
1020                         il_mod_ht40_chan_info(il, ieeeband, eeprom_ch_idx[ch],
1021                                               &eeprom_ch_info[ch],
1022                                               IEEE80211_CHAN_NO_HT40PLUS);
1023
1024                         /* Set up driver's info for upper half */
1025                         il_mod_ht40_chan_info(il, ieeeband,
1026                                               eeprom_ch_idx[ch] + 4,
1027                                               &eeprom_ch_info[ch],
1028                                               IEEE80211_CHAN_NO_HT40MINUS);
1029                 }
1030         }
1031
1032         return 0;
1033 }
1034 EXPORT_SYMBOL(il_init_channel_map);
1035
1036 /*
1037  * il_free_channel_map - undo allocations in il_init_channel_map
1038  */
1039 void
1040 il_free_channel_map(struct il_priv *il)
1041 {
1042         kfree(il->channel_info);
1043         il->channel_count = 0;
1044 }
1045 EXPORT_SYMBOL(il_free_channel_map);
1046
1047 /**
1048  * il_get_channel_info - Find driver's ilate channel info
1049  *
1050  * Based on band and channel number.
1051  */
1052 const struct il_channel_info *
1053 il_get_channel_info(const struct il_priv *il, enum ieee80211_band band,
1054                     u16 channel)
1055 {
1056         int i;
1057
1058         switch (band) {
1059         case IEEE80211_BAND_5GHZ:
1060                 for (i = 14; i < il->channel_count; i++) {
1061                         if (il->channel_info[i].channel == channel)
1062                                 return &il->channel_info[i];
1063                 }
1064                 break;
1065         case IEEE80211_BAND_2GHZ:
1066                 if (channel >= 1 && channel <= 14)
1067                         return &il->channel_info[channel - 1];
1068                 break;
1069         default:
1070                 BUG();
1071         }
1072
1073         return NULL;
1074 }
1075 EXPORT_SYMBOL(il_get_channel_info);
1076
1077 /*
1078  * Setting power level allows the card to go to sleep when not busy.
1079  *
1080  * We calculate a sleep command based on the required latency, which
1081  * we get from mac80211. In order to handle thermal throttling, we can
1082  * also use pre-defined power levels.
1083  */
1084
1085 /*
1086  * This defines the old power levels. They are still used by default
1087  * (level 1) and for thermal throttle (levels 3 through 5)
1088  */
1089
1090 struct il_power_vec_entry {
1091         struct il_powertable_cmd cmd;
1092         u8 no_dtim;             /* number of skip dtim */
1093 };
1094
1095 static void
1096 il_power_sleep_cam_cmd(struct il_priv *il, struct il_powertable_cmd *cmd)
1097 {
1098         memset(cmd, 0, sizeof(*cmd));
1099
1100         if (il->power_data.pci_pm)
1101                 cmd->flags |= IL_POWER_PCI_PM_MSK;
1102
1103         D_POWER("Sleep command for CAM\n");
1104 }
1105
1106 static int
1107 il_set_power(struct il_priv *il, struct il_powertable_cmd *cmd)
1108 {
1109         D_POWER("Sending power/sleep command\n");
1110         D_POWER("Flags value = 0x%08X\n", cmd->flags);
1111         D_POWER("Tx timeout = %u\n", le32_to_cpu(cmd->tx_data_timeout));
1112         D_POWER("Rx timeout = %u\n", le32_to_cpu(cmd->rx_data_timeout));
1113         D_POWER("Sleep interval vector = { %d , %d , %d , %d , %d }\n",
1114                 le32_to_cpu(cmd->sleep_interval[0]),
1115                 le32_to_cpu(cmd->sleep_interval[1]),
1116                 le32_to_cpu(cmd->sleep_interval[2]),
1117                 le32_to_cpu(cmd->sleep_interval[3]),
1118                 le32_to_cpu(cmd->sleep_interval[4]));
1119
1120         return il_send_cmd_pdu(il, C_POWER_TBL,
1121                                sizeof(struct il_powertable_cmd), cmd);
1122 }
1123
1124 static int
1125 il_power_set_mode(struct il_priv *il, struct il_powertable_cmd *cmd, bool force)
1126 {
1127         int ret;
1128         bool update_chains;
1129
1130         lockdep_assert_held(&il->mutex);
1131
1132         /* Don't update the RX chain when chain noise calibration is running */
1133         update_chains = il->chain_noise_data.state == IL_CHAIN_NOISE_DONE ||
1134             il->chain_noise_data.state == IL_CHAIN_NOISE_ALIVE;
1135
1136         if (!memcmp(&il->power_data.sleep_cmd, cmd, sizeof(*cmd)) && !force)
1137                 return 0;
1138
1139         if (!il_is_ready_rf(il))
1140                 return -EIO;
1141
1142         /* scan complete use sleep_power_next, need to be updated */
1143         memcpy(&il->power_data.sleep_cmd_next, cmd, sizeof(*cmd));
1144         if (test_bit(S_SCANNING, &il->status) && !force) {
1145                 D_INFO("Defer power set mode while scanning\n");
1146                 return 0;
1147         }
1148
1149         if (cmd->flags & IL_POWER_DRIVER_ALLOW_SLEEP_MSK)
1150                 set_bit(S_POWER_PMI, &il->status);
1151
1152         ret = il_set_power(il, cmd);
1153         if (!ret) {
1154                 if (!(cmd->flags & IL_POWER_DRIVER_ALLOW_SLEEP_MSK))
1155                         clear_bit(S_POWER_PMI, &il->status);
1156
1157                 if (il->ops->update_chain_flags && update_chains)
1158                         il->ops->update_chain_flags(il);
1159                 else if (il->ops->update_chain_flags)
1160                         D_POWER("Cannot update the power, chain noise "
1161                                 "calibration running: %d\n",
1162                                 il->chain_noise_data.state);
1163
1164                 memcpy(&il->power_data.sleep_cmd, cmd, sizeof(*cmd));
1165         } else
1166                 IL_ERR("set power fail, ret = %d", ret);
1167
1168         return ret;
1169 }
1170
1171 int
1172 il_power_update_mode(struct il_priv *il, bool force)
1173 {
1174         struct il_powertable_cmd cmd;
1175
1176         il_power_sleep_cam_cmd(il, &cmd);
1177         return il_power_set_mode(il, &cmd, force);
1178 }
1179 EXPORT_SYMBOL(il_power_update_mode);
1180
1181 /* initialize to default */
1182 void
1183 il_power_initialize(struct il_priv *il)
1184 {
1185         u16 lctl;
1186
1187         pcie_capability_read_word(il->pci_dev, PCI_EXP_LNKCTL, &lctl);
1188         il->power_data.pci_pm = !(lctl & PCI_EXP_LNKCTL_ASPM_L0S);
1189
1190         il->power_data.debug_sleep_level_override = -1;
1191
1192         memset(&il->power_data.sleep_cmd, 0, sizeof(il->power_data.sleep_cmd));
1193 }
1194 EXPORT_SYMBOL(il_power_initialize);
1195
1196 /* For active scan, listen ACTIVE_DWELL_TIME (msec) on each channel after
1197  * sending probe req.  This should be set long enough to hear probe responses
1198  * from more than one AP.  */
1199 #define IL_ACTIVE_DWELL_TIME_24    (30) /* all times in msec */
1200 #define IL_ACTIVE_DWELL_TIME_52    (20)
1201
1202 #define IL_ACTIVE_DWELL_FACTOR_24GHZ (3)
1203 #define IL_ACTIVE_DWELL_FACTOR_52GHZ (2)
1204
1205 /* For passive scan, listen PASSIVE_DWELL_TIME (msec) on each channel.
1206  * Must be set longer than active dwell time.
1207  * For the most reliable scan, set > AP beacon interval (typically 100msec). */
1208 #define IL_PASSIVE_DWELL_TIME_24   (20) /* all times in msec */
1209 #define IL_PASSIVE_DWELL_TIME_52   (10)
1210 #define IL_PASSIVE_DWELL_BASE      (100)
1211 #define IL_CHANNEL_TUNE_TIME       5
1212
1213 static int
1214 il_send_scan_abort(struct il_priv *il)
1215 {
1216         int ret;
1217         struct il_rx_pkt *pkt;
1218         struct il_host_cmd cmd = {
1219                 .id = C_SCAN_ABORT,
1220                 .flags = CMD_WANT_SKB,
1221         };
1222
1223         /* Exit instantly with error when device is not ready
1224          * to receive scan abort command or it does not perform
1225          * hardware scan currently */
1226         if (!test_bit(S_READY, &il->status) ||
1227             !test_bit(S_GEO_CONFIGURED, &il->status) ||
1228             !test_bit(S_SCAN_HW, &il->status) ||
1229             test_bit(S_FW_ERROR, &il->status) ||
1230             test_bit(S_EXIT_PENDING, &il->status))
1231                 return -EIO;
1232
1233         ret = il_send_cmd_sync(il, &cmd);
1234         if (ret)
1235                 return ret;
1236
1237         pkt = (struct il_rx_pkt *)cmd.reply_page;
1238         if (pkt->u.status != CAN_ABORT_STATUS) {
1239                 /* The scan abort will return 1 for success or
1240                  * 2 for "failure".  A failure condition can be
1241                  * due to simply not being in an active scan which
1242                  * can occur if we send the scan abort before we
1243                  * the microcode has notified us that a scan is
1244                  * completed. */
1245                 D_SCAN("SCAN_ABORT ret %d.\n", pkt->u.status);
1246                 ret = -EIO;
1247         }
1248
1249         il_free_pages(il, cmd.reply_page);
1250         return ret;
1251 }
1252
1253 static void
1254 il_complete_scan(struct il_priv *il, bool aborted)
1255 {
1256         /* check if scan was requested from mac80211 */
1257         if (il->scan_request) {
1258                 D_SCAN("Complete scan in mac80211\n");
1259                 ieee80211_scan_completed(il->hw, aborted);
1260         }
1261
1262         il->scan_vif = NULL;
1263         il->scan_request = NULL;
1264 }
1265
1266 void
1267 il_force_scan_end(struct il_priv *il)
1268 {
1269         lockdep_assert_held(&il->mutex);
1270
1271         if (!test_bit(S_SCANNING, &il->status)) {
1272                 D_SCAN("Forcing scan end while not scanning\n");
1273                 return;
1274         }
1275
1276         D_SCAN("Forcing scan end\n");
1277         clear_bit(S_SCANNING, &il->status);
1278         clear_bit(S_SCAN_HW, &il->status);
1279         clear_bit(S_SCAN_ABORTING, &il->status);
1280         il_complete_scan(il, true);
1281 }
1282
1283 static void
1284 il_do_scan_abort(struct il_priv *il)
1285 {
1286         int ret;
1287
1288         lockdep_assert_held(&il->mutex);
1289
1290         if (!test_bit(S_SCANNING, &il->status)) {
1291                 D_SCAN("Not performing scan to abort\n");
1292                 return;
1293         }
1294
1295         if (test_and_set_bit(S_SCAN_ABORTING, &il->status)) {
1296                 D_SCAN("Scan abort in progress\n");
1297                 return;
1298         }
1299
1300         ret = il_send_scan_abort(il);
1301         if (ret) {
1302                 D_SCAN("Send scan abort failed %d\n", ret);
1303                 il_force_scan_end(il);
1304         } else
1305                 D_SCAN("Successfully send scan abort\n");
1306 }
1307
1308 /**
1309  * il_scan_cancel - Cancel any currently executing HW scan
1310  */
1311 int
1312 il_scan_cancel(struct il_priv *il)
1313 {
1314         D_SCAN("Queuing abort scan\n");
1315         queue_work(il->workqueue, &il->abort_scan);
1316         return 0;
1317 }
1318 EXPORT_SYMBOL(il_scan_cancel);
1319
1320 /**
1321  * il_scan_cancel_timeout - Cancel any currently executing HW scan
1322  * @ms: amount of time to wait (in milliseconds) for scan to abort
1323  *
1324  */
1325 int
1326 il_scan_cancel_timeout(struct il_priv *il, unsigned long ms)
1327 {
1328         unsigned long timeout = jiffies + msecs_to_jiffies(ms);
1329
1330         lockdep_assert_held(&il->mutex);
1331
1332         D_SCAN("Scan cancel timeout\n");
1333
1334         il_do_scan_abort(il);
1335
1336         while (time_before_eq(jiffies, timeout)) {
1337                 if (!test_bit(S_SCAN_HW, &il->status))
1338                         break;
1339                 msleep(20);
1340         }
1341
1342         return test_bit(S_SCAN_HW, &il->status);
1343 }
1344 EXPORT_SYMBOL(il_scan_cancel_timeout);
1345
1346 /* Service response to C_SCAN (0x80) */
1347 static void
1348 il_hdl_scan(struct il_priv *il, struct il_rx_buf *rxb)
1349 {
1350 #ifdef CONFIG_IWLEGACY_DEBUG
1351         struct il_rx_pkt *pkt = rxb_addr(rxb);
1352         struct il_scanreq_notification *notif =
1353             (struct il_scanreq_notification *)pkt->u.raw;
1354
1355         D_SCAN("Scan request status = 0x%x\n", notif->status);
1356 #endif
1357 }
1358
1359 /* Service N_SCAN_START (0x82) */
1360 static void
1361 il_hdl_scan_start(struct il_priv *il, struct il_rx_buf *rxb)
1362 {
1363         struct il_rx_pkt *pkt = rxb_addr(rxb);
1364         struct il_scanstart_notification *notif =
1365             (struct il_scanstart_notification *)pkt->u.raw;
1366         il->scan_start_tsf = le32_to_cpu(notif->tsf_low);
1367         D_SCAN("Scan start: " "%d [802.11%s] "
1368                "(TSF: 0x%08X:%08X) - %d (beacon timer %u)\n", notif->channel,
1369                notif->band ? "bg" : "a", le32_to_cpu(notif->tsf_high),
1370                le32_to_cpu(notif->tsf_low), notif->status, notif->beacon_timer);
1371 }
1372
1373 /* Service N_SCAN_RESULTS (0x83) */
1374 static void
1375 il_hdl_scan_results(struct il_priv *il, struct il_rx_buf *rxb)
1376 {
1377 #ifdef CONFIG_IWLEGACY_DEBUG
1378         struct il_rx_pkt *pkt = rxb_addr(rxb);
1379         struct il_scanresults_notification *notif =
1380             (struct il_scanresults_notification *)pkt->u.raw;
1381
1382         D_SCAN("Scan ch.res: " "%d [802.11%s] " "(TSF: 0x%08X:%08X) - %d "
1383                "elapsed=%lu usec\n", notif->channel, notif->band ? "bg" : "a",
1384                le32_to_cpu(notif->tsf_high), le32_to_cpu(notif->tsf_low),
1385                le32_to_cpu(notif->stats[0]),
1386                le32_to_cpu(notif->tsf_low) - il->scan_start_tsf);
1387 #endif
1388 }
1389
1390 /* Service N_SCAN_COMPLETE (0x84) */
1391 static void
1392 il_hdl_scan_complete(struct il_priv *il, struct il_rx_buf *rxb)
1393 {
1394
1395 #ifdef CONFIG_IWLEGACY_DEBUG
1396         struct il_rx_pkt *pkt = rxb_addr(rxb);
1397         struct il_scancomplete_notification *scan_notif = (void *)pkt->u.raw;
1398 #endif
1399
1400         D_SCAN("Scan complete: %d channels (TSF 0x%08X:%08X) - %d\n",
1401                scan_notif->scanned_channels, scan_notif->tsf_low,
1402                scan_notif->tsf_high, scan_notif->status);
1403
1404         /* The HW is no longer scanning */
1405         clear_bit(S_SCAN_HW, &il->status);
1406
1407         D_SCAN("Scan on %sGHz took %dms\n",
1408                (il->scan_band == IEEE80211_BAND_2GHZ) ? "2.4" : "5.2",
1409                jiffies_to_msecs(jiffies - il->scan_start));
1410
1411         queue_work(il->workqueue, &il->scan_completed);
1412 }
1413
1414 void
1415 il_setup_rx_scan_handlers(struct il_priv *il)
1416 {
1417         /* scan handlers */
1418         il->handlers[C_SCAN] = il_hdl_scan;
1419         il->handlers[N_SCAN_START] = il_hdl_scan_start;
1420         il->handlers[N_SCAN_RESULTS] = il_hdl_scan_results;
1421         il->handlers[N_SCAN_COMPLETE] = il_hdl_scan_complete;
1422 }
1423 EXPORT_SYMBOL(il_setup_rx_scan_handlers);
1424
1425 u16
1426 il_get_active_dwell_time(struct il_priv *il, enum ieee80211_band band,
1427                          u8 n_probes)
1428 {
1429         if (band == IEEE80211_BAND_5GHZ)
1430                 return IL_ACTIVE_DWELL_TIME_52 +
1431                     IL_ACTIVE_DWELL_FACTOR_52GHZ * (n_probes + 1);
1432         else
1433                 return IL_ACTIVE_DWELL_TIME_24 +
1434                     IL_ACTIVE_DWELL_FACTOR_24GHZ * (n_probes + 1);
1435 }
1436 EXPORT_SYMBOL(il_get_active_dwell_time);
1437
1438 u16
1439 il_get_passive_dwell_time(struct il_priv *il, enum ieee80211_band band,
1440                           struct ieee80211_vif *vif)
1441 {
1442         u16 value;
1443
1444         u16 passive =
1445             (band ==
1446              IEEE80211_BAND_2GHZ) ? IL_PASSIVE_DWELL_BASE +
1447             IL_PASSIVE_DWELL_TIME_24 : IL_PASSIVE_DWELL_BASE +
1448             IL_PASSIVE_DWELL_TIME_52;
1449
1450         if (il_is_any_associated(il)) {
1451                 /*
1452                  * If we're associated, we clamp the maximum passive
1453                  * dwell time to be 98% of the smallest beacon interval
1454                  * (minus 2 * channel tune time)
1455                  */
1456                 value = il->vif ? il->vif->bss_conf.beacon_int : 0;
1457                 if (value > IL_PASSIVE_DWELL_BASE || !value)
1458                         value = IL_PASSIVE_DWELL_BASE;
1459                 value = (value * 98) / 100 - IL_CHANNEL_TUNE_TIME * 2;
1460                 passive = min(value, passive);
1461         }
1462
1463         return passive;
1464 }
1465 EXPORT_SYMBOL(il_get_passive_dwell_time);
1466
1467 void
1468 il_init_scan_params(struct il_priv *il)
1469 {
1470         u8 ant_idx = fls(il->hw_params.valid_tx_ant) - 1;
1471         if (!il->scan_tx_ant[IEEE80211_BAND_5GHZ])
1472                 il->scan_tx_ant[IEEE80211_BAND_5GHZ] = ant_idx;
1473         if (!il->scan_tx_ant[IEEE80211_BAND_2GHZ])
1474                 il->scan_tx_ant[IEEE80211_BAND_2GHZ] = ant_idx;
1475 }
1476 EXPORT_SYMBOL(il_init_scan_params);
1477
1478 static int
1479 il_scan_initiate(struct il_priv *il, struct ieee80211_vif *vif)
1480 {
1481         int ret;
1482
1483         lockdep_assert_held(&il->mutex);
1484
1485         cancel_delayed_work(&il->scan_check);
1486
1487         if (!il_is_ready_rf(il)) {
1488                 IL_WARN("Request scan called when driver not ready.\n");
1489                 return -EIO;
1490         }
1491
1492         if (test_bit(S_SCAN_HW, &il->status)) {
1493                 D_SCAN("Multiple concurrent scan requests in parallel.\n");
1494                 return -EBUSY;
1495         }
1496
1497         if (test_bit(S_SCAN_ABORTING, &il->status)) {
1498                 D_SCAN("Scan request while abort pending.\n");
1499                 return -EBUSY;
1500         }
1501
1502         D_SCAN("Starting scan...\n");
1503
1504         set_bit(S_SCANNING, &il->status);
1505         il->scan_start = jiffies;
1506
1507         ret = il->ops->request_scan(il, vif);
1508         if (ret) {
1509                 clear_bit(S_SCANNING, &il->status);
1510                 return ret;
1511         }
1512
1513         queue_delayed_work(il->workqueue, &il->scan_check,
1514                            IL_SCAN_CHECK_WATCHDOG);
1515
1516         return 0;
1517 }
1518
1519 int
1520 il_mac_hw_scan(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
1521                struct cfg80211_scan_request *req)
1522 {
1523         struct il_priv *il = hw->priv;
1524         int ret;
1525
1526         if (req->n_channels == 0) {
1527                 IL_ERR("Can not scan on no channels.\n");
1528                 return -EINVAL;
1529         }
1530
1531         mutex_lock(&il->mutex);
1532         D_MAC80211("enter\n");
1533
1534         if (test_bit(S_SCANNING, &il->status)) {
1535                 D_SCAN("Scan already in progress.\n");
1536                 ret = -EAGAIN;
1537                 goto out_unlock;
1538         }
1539
1540         /* mac80211 will only ask for one band at a time */
1541         il->scan_request = req;
1542         il->scan_vif = vif;
1543         il->scan_band = req->channels[0]->band;
1544
1545         ret = il_scan_initiate(il, vif);
1546
1547 out_unlock:
1548         D_MAC80211("leave ret %d\n", ret);
1549         mutex_unlock(&il->mutex);
1550
1551         return ret;
1552 }
1553 EXPORT_SYMBOL(il_mac_hw_scan);
1554
1555 static void
1556 il_bg_scan_check(struct work_struct *data)
1557 {
1558         struct il_priv *il =
1559             container_of(data, struct il_priv, scan_check.work);
1560
1561         D_SCAN("Scan check work\n");
1562
1563         /* Since we are here firmware does not finish scan and
1564          * most likely is in bad shape, so we don't bother to
1565          * send abort command, just force scan complete to mac80211 */
1566         mutex_lock(&il->mutex);
1567         il_force_scan_end(il);
1568         mutex_unlock(&il->mutex);
1569 }
1570
1571 /**
1572  * il_fill_probe_req - fill in all required fields and IE for probe request
1573  */
1574
1575 u16
1576 il_fill_probe_req(struct il_priv *il, struct ieee80211_mgmt *frame,
1577                   const u8 *ta, const u8 *ies, int ie_len, int left)
1578 {
1579         int len = 0;
1580         u8 *pos = NULL;
1581
1582         /* Make sure there is enough space for the probe request,
1583          * two mandatory IEs and the data */
1584         left -= 24;
1585         if (left < 0)
1586                 return 0;
1587
1588         frame->frame_control = cpu_to_le16(IEEE80211_STYPE_PROBE_REQ);
1589         eth_broadcast_addr(frame->da);
1590         memcpy(frame->sa, ta, ETH_ALEN);
1591         eth_broadcast_addr(frame->bssid);
1592         frame->seq_ctrl = 0;
1593
1594         len += 24;
1595
1596         /* ...next IE... */
1597         pos = &frame->u.probe_req.variable[0];
1598
1599         /* fill in our indirect SSID IE */
1600         left -= 2;
1601         if (left < 0)
1602                 return 0;
1603         *pos++ = WLAN_EID_SSID;
1604         *pos++ = 0;
1605
1606         len += 2;
1607
1608         if (WARN_ON(left < ie_len))
1609                 return len;
1610
1611         if (ies && ie_len) {
1612                 memcpy(pos, ies, ie_len);
1613                 len += ie_len;
1614         }
1615
1616         return (u16) len;
1617 }
1618 EXPORT_SYMBOL(il_fill_probe_req);
1619
1620 static void
1621 il_bg_abort_scan(struct work_struct *work)
1622 {
1623         struct il_priv *il = container_of(work, struct il_priv, abort_scan);
1624
1625         D_SCAN("Abort scan work\n");
1626
1627         /* We keep scan_check work queued in case when firmware will not
1628          * report back scan completed notification */
1629         mutex_lock(&il->mutex);
1630         il_scan_cancel_timeout(il, 200);
1631         mutex_unlock(&il->mutex);
1632 }
1633
1634 static void
1635 il_bg_scan_completed(struct work_struct *work)
1636 {
1637         struct il_priv *il = container_of(work, struct il_priv, scan_completed);
1638         bool aborted;
1639
1640         D_SCAN("Completed scan.\n");
1641
1642         cancel_delayed_work(&il->scan_check);
1643
1644         mutex_lock(&il->mutex);
1645
1646         aborted = test_and_clear_bit(S_SCAN_ABORTING, &il->status);
1647         if (aborted)
1648                 D_SCAN("Aborted scan completed.\n");
1649
1650         if (!test_and_clear_bit(S_SCANNING, &il->status)) {
1651                 D_SCAN("Scan already completed.\n");
1652                 goto out_settings;
1653         }
1654
1655         il_complete_scan(il, aborted);
1656
1657 out_settings:
1658         /* Can we still talk to firmware ? */
1659         if (!il_is_ready_rf(il))
1660                 goto out;
1661
1662         /*
1663          * We do not commit power settings while scan is pending,
1664          * do it now if the settings changed.
1665          */
1666         il_power_set_mode(il, &il->power_data.sleep_cmd_next, false);
1667         il_set_tx_power(il, il->tx_power_next, false);
1668
1669         il->ops->post_scan(il);
1670
1671 out:
1672         mutex_unlock(&il->mutex);
1673 }
1674
1675 void
1676 il_setup_scan_deferred_work(struct il_priv *il)
1677 {
1678         INIT_WORK(&il->scan_completed, il_bg_scan_completed);
1679         INIT_WORK(&il->abort_scan, il_bg_abort_scan);
1680         INIT_DELAYED_WORK(&il->scan_check, il_bg_scan_check);
1681 }
1682 EXPORT_SYMBOL(il_setup_scan_deferred_work);
1683
1684 void
1685 il_cancel_scan_deferred_work(struct il_priv *il)
1686 {
1687         cancel_work_sync(&il->abort_scan);
1688         cancel_work_sync(&il->scan_completed);
1689
1690         if (cancel_delayed_work_sync(&il->scan_check)) {
1691                 mutex_lock(&il->mutex);
1692                 il_force_scan_end(il);
1693                 mutex_unlock(&il->mutex);
1694         }
1695 }
1696 EXPORT_SYMBOL(il_cancel_scan_deferred_work);
1697
1698 /* il->sta_lock must be held */
1699 static void
1700 il_sta_ucode_activate(struct il_priv *il, u8 sta_id)
1701 {
1702
1703         if (!(il->stations[sta_id].used & IL_STA_DRIVER_ACTIVE))
1704                 IL_ERR("ACTIVATE a non DRIVER active station id %u addr %pM\n",
1705                        sta_id, il->stations[sta_id].sta.sta.addr);
1706
1707         if (il->stations[sta_id].used & IL_STA_UCODE_ACTIVE) {
1708                 D_ASSOC("STA id %u addr %pM already present"
1709                         " in uCode (according to driver)\n", sta_id,
1710                         il->stations[sta_id].sta.sta.addr);
1711         } else {
1712                 il->stations[sta_id].used |= IL_STA_UCODE_ACTIVE;
1713                 D_ASSOC("Added STA id %u addr %pM to uCode\n", sta_id,
1714                         il->stations[sta_id].sta.sta.addr);
1715         }
1716 }
1717
1718 static int
1719 il_process_add_sta_resp(struct il_priv *il, struct il_addsta_cmd *addsta,
1720                         struct il_rx_pkt *pkt, bool sync)
1721 {
1722         u8 sta_id = addsta->sta.sta_id;
1723         unsigned long flags;
1724         int ret = -EIO;
1725
1726         if (pkt->hdr.flags & IL_CMD_FAILED_MSK) {
1727                 IL_ERR("Bad return from C_ADD_STA (0x%08X)\n", pkt->hdr.flags);
1728                 return ret;
1729         }
1730
1731         D_INFO("Processing response for adding station %u\n", sta_id);
1732
1733         spin_lock_irqsave(&il->sta_lock, flags);
1734
1735         switch (pkt->u.add_sta.status) {
1736         case ADD_STA_SUCCESS_MSK:
1737                 D_INFO("C_ADD_STA PASSED\n");
1738                 il_sta_ucode_activate(il, sta_id);
1739                 ret = 0;
1740                 break;
1741         case ADD_STA_NO_ROOM_IN_TBL:
1742                 IL_ERR("Adding station %d failed, no room in table.\n", sta_id);
1743                 break;
1744         case ADD_STA_NO_BLOCK_ACK_RESOURCE:
1745                 IL_ERR("Adding station %d failed, no block ack resource.\n",
1746                        sta_id);
1747                 break;
1748         case ADD_STA_MODIFY_NON_EXIST_STA:
1749                 IL_ERR("Attempting to modify non-existing station %d\n",
1750                        sta_id);
1751                 break;
1752         default:
1753                 D_ASSOC("Received C_ADD_STA:(0x%08X)\n", pkt->u.add_sta.status);
1754                 break;
1755         }
1756
1757         D_INFO("%s station id %u addr %pM\n",
1758                il->stations[sta_id].sta.mode ==
1759                STA_CONTROL_MODIFY_MSK ? "Modified" : "Added", sta_id,
1760                il->stations[sta_id].sta.sta.addr);
1761
1762         /*
1763          * XXX: The MAC address in the command buffer is often changed from
1764          * the original sent to the device. That is, the MAC address
1765          * written to the command buffer often is not the same MAC address
1766          * read from the command buffer when the command returns. This
1767          * issue has not yet been resolved and this debugging is left to
1768          * observe the problem.
1769          */
1770         D_INFO("%s station according to cmd buffer %pM\n",
1771                il->stations[sta_id].sta.mode ==
1772                STA_CONTROL_MODIFY_MSK ? "Modified" : "Added", addsta->sta.addr);
1773         spin_unlock_irqrestore(&il->sta_lock, flags);
1774
1775         return ret;
1776 }
1777
1778 static void
1779 il_add_sta_callback(struct il_priv *il, struct il_device_cmd *cmd,
1780                     struct il_rx_pkt *pkt)
1781 {
1782         struct il_addsta_cmd *addsta = (struct il_addsta_cmd *)cmd->cmd.payload;
1783
1784         il_process_add_sta_resp(il, addsta, pkt, false);
1785
1786 }
1787
1788 int
1789 il_send_add_sta(struct il_priv *il, struct il_addsta_cmd *sta, u8 flags)
1790 {
1791         struct il_rx_pkt *pkt = NULL;
1792         int ret = 0;
1793         u8 data[sizeof(*sta)];
1794         struct il_host_cmd cmd = {
1795                 .id = C_ADD_STA,
1796                 .flags = flags,
1797                 .data = data,
1798         };
1799         u8 sta_id __maybe_unused = sta->sta.sta_id;
1800
1801         D_INFO("Adding sta %u (%pM) %ssynchronously\n", sta_id, sta->sta.addr,
1802                flags & CMD_ASYNC ? "a" : "");
1803
1804         if (flags & CMD_ASYNC)
1805                 cmd.callback = il_add_sta_callback;
1806         else {
1807                 cmd.flags |= CMD_WANT_SKB;
1808                 might_sleep();
1809         }
1810
1811         cmd.len = il->ops->build_addsta_hcmd(sta, data);
1812         ret = il_send_cmd(il, &cmd);
1813
1814         if (ret || (flags & CMD_ASYNC))
1815                 return ret;
1816
1817         if (ret == 0) {
1818                 pkt = (struct il_rx_pkt *)cmd.reply_page;
1819                 ret = il_process_add_sta_resp(il, sta, pkt, true);
1820         }
1821         il_free_pages(il, cmd.reply_page);
1822
1823         return ret;
1824 }
1825 EXPORT_SYMBOL(il_send_add_sta);
1826
1827 static void
1828 il_set_ht_add_station(struct il_priv *il, u8 idx, struct ieee80211_sta *sta)
1829 {
1830         struct ieee80211_sta_ht_cap *sta_ht_inf = &sta->ht_cap;
1831         __le32 sta_flags;
1832
1833         if (!sta || !sta_ht_inf->ht_supported)
1834                 goto done;
1835
1836         D_ASSOC("spatial multiplexing power save mode: %s\n",
1837                 (sta->smps_mode == IEEE80211_SMPS_STATIC) ? "static" :
1838                 (sta->smps_mode == IEEE80211_SMPS_DYNAMIC) ? "dynamic" :
1839                 "disabled");
1840
1841         sta_flags = il->stations[idx].sta.station_flags;
1842
1843         sta_flags &= ~(STA_FLG_RTS_MIMO_PROT_MSK | STA_FLG_MIMO_DIS_MSK);
1844
1845         switch (sta->smps_mode) {
1846         case IEEE80211_SMPS_STATIC:
1847                 sta_flags |= STA_FLG_MIMO_DIS_MSK;
1848                 break;
1849         case IEEE80211_SMPS_DYNAMIC:
1850                 sta_flags |= STA_FLG_RTS_MIMO_PROT_MSK;
1851                 break;
1852         case IEEE80211_SMPS_OFF:
1853                 break;
1854         default:
1855                 IL_WARN("Invalid MIMO PS mode %d\n", sta->smps_mode);
1856                 break;
1857         }
1858
1859         sta_flags |=
1860             cpu_to_le32((u32) sta_ht_inf->
1861                         ampdu_factor << STA_FLG_MAX_AGG_SIZE_POS);
1862
1863         sta_flags |=
1864             cpu_to_le32((u32) sta_ht_inf->
1865                         ampdu_density << STA_FLG_AGG_MPDU_DENSITY_POS);
1866
1867         if (il_is_ht40_tx_allowed(il, &sta->ht_cap))
1868                 sta_flags |= STA_FLG_HT40_EN_MSK;
1869         else
1870                 sta_flags &= ~STA_FLG_HT40_EN_MSK;
1871
1872         il->stations[idx].sta.station_flags = sta_flags;
1873 done:
1874         return;
1875 }
1876
1877 /**
1878  * il_prep_station - Prepare station information for addition
1879  *
1880  * should be called with sta_lock held
1881  */
1882 u8
1883 il_prep_station(struct il_priv *il, const u8 *addr, bool is_ap,
1884                 struct ieee80211_sta *sta)
1885 {
1886         struct il_station_entry *station;
1887         int i;
1888         u8 sta_id = IL_INVALID_STATION;
1889         u16 rate;
1890
1891         if (is_ap)
1892                 sta_id = IL_AP_ID;
1893         else if (is_broadcast_ether_addr(addr))
1894                 sta_id = il->hw_params.bcast_id;
1895         else
1896                 for (i = IL_STA_ID; i < il->hw_params.max_stations; i++) {
1897                         if (ether_addr_equal(il->stations[i].sta.sta.addr,
1898                                              addr)) {
1899                                 sta_id = i;
1900                                 break;
1901                         }
1902
1903                         if (!il->stations[i].used &&
1904                             sta_id == IL_INVALID_STATION)
1905                                 sta_id = i;
1906                 }
1907
1908         /*
1909          * These two conditions have the same outcome, but keep them
1910          * separate
1911          */
1912         if (unlikely(sta_id == IL_INVALID_STATION))
1913                 return sta_id;
1914
1915         /*
1916          * uCode is not able to deal with multiple requests to add a
1917          * station. Keep track if one is in progress so that we do not send
1918          * another.
1919          */
1920         if (il->stations[sta_id].used & IL_STA_UCODE_INPROGRESS) {
1921                 D_INFO("STA %d already in process of being added.\n", sta_id);
1922                 return sta_id;
1923         }
1924
1925         if ((il->stations[sta_id].used & IL_STA_DRIVER_ACTIVE) &&
1926             (il->stations[sta_id].used & IL_STA_UCODE_ACTIVE) &&
1927             ether_addr_equal(il->stations[sta_id].sta.sta.addr, addr)) {
1928                 D_ASSOC("STA %d (%pM) already added, not adding again.\n",
1929                         sta_id, addr);
1930                 return sta_id;
1931         }
1932
1933         station = &il->stations[sta_id];
1934         station->used = IL_STA_DRIVER_ACTIVE;
1935         D_ASSOC("Add STA to driver ID %d: %pM\n", sta_id, addr);
1936         il->num_stations++;
1937
1938         /* Set up the C_ADD_STA command to send to device */
1939         memset(&station->sta, 0, sizeof(struct il_addsta_cmd));
1940         memcpy(station->sta.sta.addr, addr, ETH_ALEN);
1941         station->sta.mode = 0;
1942         station->sta.sta.sta_id = sta_id;
1943         station->sta.station_flags = 0;
1944
1945         /*
1946          * OK to call unconditionally, since local stations (IBSS BSSID
1947          * STA and broadcast STA) pass in a NULL sta, and mac80211
1948          * doesn't allow HT IBSS.
1949          */
1950         il_set_ht_add_station(il, sta_id, sta);
1951
1952         /* 3945 only */
1953         rate = (il->band == IEEE80211_BAND_5GHZ) ? RATE_6M_PLCP : RATE_1M_PLCP;
1954         /* Turn on both antennas for the station... */
1955         station->sta.rate_n_flags = cpu_to_le16(rate | RATE_MCS_ANT_AB_MSK);
1956
1957         return sta_id;
1958
1959 }
1960 EXPORT_SYMBOL_GPL(il_prep_station);
1961
1962 #define STA_WAIT_TIMEOUT (HZ/2)
1963
1964 /**
1965  * il_add_station_common -
1966  */
1967 int
1968 il_add_station_common(struct il_priv *il, const u8 *addr, bool is_ap,
1969                       struct ieee80211_sta *sta, u8 *sta_id_r)
1970 {
1971         unsigned long flags_spin;
1972         int ret = 0;
1973         u8 sta_id;
1974         struct il_addsta_cmd sta_cmd;
1975
1976         *sta_id_r = 0;
1977         spin_lock_irqsave(&il->sta_lock, flags_spin);
1978         sta_id = il_prep_station(il, addr, is_ap, sta);
1979         if (sta_id == IL_INVALID_STATION) {
1980                 IL_ERR("Unable to prepare station %pM for addition\n", addr);
1981                 spin_unlock_irqrestore(&il->sta_lock, flags_spin);
1982                 return -EINVAL;
1983         }
1984
1985         /*
1986          * uCode is not able to deal with multiple requests to add a
1987          * station. Keep track if one is in progress so that we do not send
1988          * another.
1989          */
1990         if (il->stations[sta_id].used & IL_STA_UCODE_INPROGRESS) {
1991                 D_INFO("STA %d already in process of being added.\n", sta_id);
1992                 spin_unlock_irqrestore(&il->sta_lock, flags_spin);
1993                 return -EEXIST;
1994         }
1995
1996         if ((il->stations[sta_id].used & IL_STA_DRIVER_ACTIVE) &&
1997             (il->stations[sta_id].used & IL_STA_UCODE_ACTIVE)) {
1998                 D_ASSOC("STA %d (%pM) already added, not adding again.\n",
1999                         sta_id, addr);
2000                 spin_unlock_irqrestore(&il->sta_lock, flags_spin);
2001                 return -EEXIST;
2002         }
2003
2004         il->stations[sta_id].used |= IL_STA_UCODE_INPROGRESS;
2005         memcpy(&sta_cmd, &il->stations[sta_id].sta,
2006                sizeof(struct il_addsta_cmd));
2007         spin_unlock_irqrestore(&il->sta_lock, flags_spin);
2008
2009         /* Add station to device's station table */
2010         ret = il_send_add_sta(il, &sta_cmd, CMD_SYNC);
2011         if (ret) {
2012                 spin_lock_irqsave(&il->sta_lock, flags_spin);
2013                 IL_ERR("Adding station %pM failed.\n",
2014                        il->stations[sta_id].sta.sta.addr);
2015                 il->stations[sta_id].used &= ~IL_STA_DRIVER_ACTIVE;
2016                 il->stations[sta_id].used &= ~IL_STA_UCODE_INPROGRESS;
2017                 spin_unlock_irqrestore(&il->sta_lock, flags_spin);
2018         }
2019         *sta_id_r = sta_id;
2020         return ret;
2021 }
2022 EXPORT_SYMBOL(il_add_station_common);
2023
2024 /**
2025  * il_sta_ucode_deactivate - deactivate ucode status for a station
2026  *
2027  * il->sta_lock must be held
2028  */
2029 static void
2030 il_sta_ucode_deactivate(struct il_priv *il, u8 sta_id)
2031 {
2032         /* Ucode must be active and driver must be non active */
2033         if ((il->stations[sta_id].
2034              used & (IL_STA_UCODE_ACTIVE | IL_STA_DRIVER_ACTIVE)) !=
2035             IL_STA_UCODE_ACTIVE)
2036                 IL_ERR("removed non active STA %u\n", sta_id);
2037
2038         il->stations[sta_id].used &= ~IL_STA_UCODE_ACTIVE;
2039
2040         memset(&il->stations[sta_id], 0, sizeof(struct il_station_entry));
2041         D_ASSOC("Removed STA %u\n", sta_id);
2042 }
2043
2044 static int
2045 il_send_remove_station(struct il_priv *il, const u8 * addr, int sta_id,
2046                        bool temporary)
2047 {
2048         struct il_rx_pkt *pkt;
2049         int ret;
2050
2051         unsigned long flags_spin;
2052         struct il_rem_sta_cmd rm_sta_cmd;
2053
2054         struct il_host_cmd cmd = {
2055                 .id = C_REM_STA,
2056                 .len = sizeof(struct il_rem_sta_cmd),
2057                 .flags = CMD_SYNC,
2058                 .data = &rm_sta_cmd,
2059         };
2060
2061         memset(&rm_sta_cmd, 0, sizeof(rm_sta_cmd));
2062         rm_sta_cmd.num_sta = 1;
2063         memcpy(&rm_sta_cmd.addr, addr, ETH_ALEN);
2064
2065         cmd.flags |= CMD_WANT_SKB;
2066
2067         ret = il_send_cmd(il, &cmd);
2068
2069         if (ret)
2070                 return ret;
2071
2072         pkt = (struct il_rx_pkt *)cmd.reply_page;
2073         if (pkt->hdr.flags & IL_CMD_FAILED_MSK) {
2074                 IL_ERR("Bad return from C_REM_STA (0x%08X)\n", pkt->hdr.flags);
2075                 ret = -EIO;
2076         }
2077
2078         if (!ret) {
2079                 switch (pkt->u.rem_sta.status) {
2080                 case REM_STA_SUCCESS_MSK:
2081                         if (!temporary) {
2082                                 spin_lock_irqsave(&il->sta_lock, flags_spin);
2083                                 il_sta_ucode_deactivate(il, sta_id);
2084                                 spin_unlock_irqrestore(&il->sta_lock,
2085                                                        flags_spin);
2086                         }
2087                         D_ASSOC("C_REM_STA PASSED\n");
2088                         break;
2089                 default:
2090                         ret = -EIO;
2091                         IL_ERR("C_REM_STA failed\n");
2092                         break;
2093                 }
2094         }
2095         il_free_pages(il, cmd.reply_page);
2096
2097         return ret;
2098 }
2099
2100 /**
2101  * il_remove_station - Remove driver's knowledge of station.
2102  */
2103 int
2104 il_remove_station(struct il_priv *il, const u8 sta_id, const u8 * addr)
2105 {
2106         unsigned long flags;
2107
2108         if (!il_is_ready(il)) {
2109                 D_INFO("Unable to remove station %pM, device not ready.\n",
2110                        addr);
2111                 /*
2112                  * It is typical for stations to be removed when we are
2113                  * going down. Return success since device will be down
2114                  * soon anyway
2115                  */
2116                 return 0;
2117         }
2118
2119         D_ASSOC("Removing STA from driver:%d  %pM\n", sta_id, addr);
2120
2121         if (WARN_ON(sta_id == IL_INVALID_STATION))
2122                 return -EINVAL;
2123
2124         spin_lock_irqsave(&il->sta_lock, flags);
2125
2126         if (!(il->stations[sta_id].used & IL_STA_DRIVER_ACTIVE)) {
2127                 D_INFO("Removing %pM but non DRIVER active\n", addr);
2128                 goto out_err;
2129         }
2130
2131         if (!(il->stations[sta_id].used & IL_STA_UCODE_ACTIVE)) {
2132                 D_INFO("Removing %pM but non UCODE active\n", addr);
2133                 goto out_err;
2134         }
2135
2136         if (il->stations[sta_id].used & IL_STA_LOCAL) {
2137                 kfree(il->stations[sta_id].lq);
2138                 il->stations[sta_id].lq = NULL;
2139         }
2140
2141         il->stations[sta_id].used &= ~IL_STA_DRIVER_ACTIVE;
2142
2143         il->num_stations--;
2144
2145         BUG_ON(il->num_stations < 0);
2146
2147         spin_unlock_irqrestore(&il->sta_lock, flags);
2148
2149         return il_send_remove_station(il, addr, sta_id, false);
2150 out_err:
2151         spin_unlock_irqrestore(&il->sta_lock, flags);
2152         return -EINVAL;
2153 }
2154 EXPORT_SYMBOL_GPL(il_remove_station);
2155
2156 /**
2157  * il_clear_ucode_stations - clear ucode station table bits
2158  *
2159  * This function clears all the bits in the driver indicating
2160  * which stations are active in the ucode. Call when something
2161  * other than explicit station management would cause this in
2162  * the ucode, e.g. unassociated RXON.
2163  */
2164 void
2165 il_clear_ucode_stations(struct il_priv *il)
2166 {
2167         int i;
2168         unsigned long flags_spin;
2169         bool cleared = false;
2170
2171         D_INFO("Clearing ucode stations in driver\n");
2172
2173         spin_lock_irqsave(&il->sta_lock, flags_spin);
2174         for (i = 0; i < il->hw_params.max_stations; i++) {
2175                 if (il->stations[i].used & IL_STA_UCODE_ACTIVE) {
2176                         D_INFO("Clearing ucode active for station %d\n", i);
2177                         il->stations[i].used &= ~IL_STA_UCODE_ACTIVE;
2178                         cleared = true;
2179                 }
2180         }
2181         spin_unlock_irqrestore(&il->sta_lock, flags_spin);
2182
2183         if (!cleared)
2184                 D_INFO("No active stations found to be cleared\n");
2185 }
2186 EXPORT_SYMBOL(il_clear_ucode_stations);
2187
2188 /**
2189  * il_restore_stations() - Restore driver known stations to device
2190  *
2191  * All stations considered active by driver, but not present in ucode, is
2192  * restored.
2193  *
2194  * Function sleeps.
2195  */
2196 void
2197 il_restore_stations(struct il_priv *il)
2198 {
2199         struct il_addsta_cmd sta_cmd;
2200         struct il_link_quality_cmd lq;
2201         unsigned long flags_spin;
2202         int i;
2203         bool found = false;
2204         int ret;
2205         bool send_lq;
2206
2207         if (!il_is_ready(il)) {
2208                 D_INFO("Not ready yet, not restoring any stations.\n");
2209                 return;
2210         }
2211
2212         D_ASSOC("Restoring all known stations ... start.\n");
2213         spin_lock_irqsave(&il->sta_lock, flags_spin);
2214         for (i = 0; i < il->hw_params.max_stations; i++) {
2215                 if ((il->stations[i].used & IL_STA_DRIVER_ACTIVE) &&
2216                     !(il->stations[i].used & IL_STA_UCODE_ACTIVE)) {
2217                         D_ASSOC("Restoring sta %pM\n",
2218                                 il->stations[i].sta.sta.addr);
2219                         il->stations[i].sta.mode = 0;
2220                         il->stations[i].used |= IL_STA_UCODE_INPROGRESS;
2221                         found = true;
2222                 }
2223         }
2224
2225         for (i = 0; i < il->hw_params.max_stations; i++) {
2226                 if ((il->stations[i].used & IL_STA_UCODE_INPROGRESS)) {
2227                         memcpy(&sta_cmd, &il->stations[i].sta,
2228                                sizeof(struct il_addsta_cmd));
2229                         send_lq = false;
2230                         if (il->stations[i].lq) {
2231                                 memcpy(&lq, il->stations[i].lq,
2232                                        sizeof(struct il_link_quality_cmd));
2233                                 send_lq = true;
2234                         }
2235                         spin_unlock_irqrestore(&il->sta_lock, flags_spin);
2236                         ret = il_send_add_sta(il, &sta_cmd, CMD_SYNC);
2237                         if (ret) {
2238                                 spin_lock_irqsave(&il->sta_lock, flags_spin);
2239                                 IL_ERR("Adding station %pM failed.\n",
2240                                        il->stations[i].sta.sta.addr);
2241                                 il->stations[i].used &= ~IL_STA_DRIVER_ACTIVE;
2242                                 il->stations[i].used &=
2243                                     ~IL_STA_UCODE_INPROGRESS;
2244                                 spin_unlock_irqrestore(&il->sta_lock,
2245                                                        flags_spin);
2246                         }
2247                         /*
2248                          * Rate scaling has already been initialized, send
2249                          * current LQ command
2250                          */
2251                         if (send_lq)
2252                                 il_send_lq_cmd(il, &lq, CMD_SYNC, true);
2253                         spin_lock_irqsave(&il->sta_lock, flags_spin);
2254                         il->stations[i].used &= ~IL_STA_UCODE_INPROGRESS;
2255                 }
2256         }
2257
2258         spin_unlock_irqrestore(&il->sta_lock, flags_spin);
2259         if (!found)
2260                 D_INFO("Restoring all known stations"
2261                        " .... no stations to be restored.\n");
2262         else
2263                 D_INFO("Restoring all known stations" " .... complete.\n");
2264 }
2265 EXPORT_SYMBOL(il_restore_stations);
2266
2267 int
2268 il_get_free_ucode_key_idx(struct il_priv *il)
2269 {
2270         int i;
2271
2272         for (i = 0; i < il->sta_key_max_num; i++)
2273                 if (!test_and_set_bit(i, &il->ucode_key_table))
2274                         return i;
2275
2276         return WEP_INVALID_OFFSET;
2277 }
2278 EXPORT_SYMBOL(il_get_free_ucode_key_idx);
2279
2280 void
2281 il_dealloc_bcast_stations(struct il_priv *il)
2282 {
2283         unsigned long flags;
2284         int i;
2285
2286         spin_lock_irqsave(&il->sta_lock, flags);
2287         for (i = 0; i < il->hw_params.max_stations; i++) {
2288                 if (!(il->stations[i].used & IL_STA_BCAST))
2289                         continue;
2290
2291                 il->stations[i].used &= ~IL_STA_UCODE_ACTIVE;
2292                 il->num_stations--;
2293                 BUG_ON(il->num_stations < 0);
2294                 kfree(il->stations[i].lq);
2295                 il->stations[i].lq = NULL;
2296         }
2297         spin_unlock_irqrestore(&il->sta_lock, flags);
2298 }
2299 EXPORT_SYMBOL_GPL(il_dealloc_bcast_stations);
2300
2301 #ifdef CONFIG_IWLEGACY_DEBUG
2302 static void
2303 il_dump_lq_cmd(struct il_priv *il, struct il_link_quality_cmd *lq)
2304 {
2305         int i;
2306         D_RATE("lq station id 0x%x\n", lq->sta_id);
2307         D_RATE("lq ant 0x%X 0x%X\n", lq->general_params.single_stream_ant_msk,
2308                lq->general_params.dual_stream_ant_msk);
2309
2310         for (i = 0; i < LINK_QUAL_MAX_RETRY_NUM; i++)
2311                 D_RATE("lq idx %d 0x%X\n", i, lq->rs_table[i].rate_n_flags);
2312 }
2313 #else
2314 static inline void
2315 il_dump_lq_cmd(struct il_priv *il, struct il_link_quality_cmd *lq)
2316 {
2317 }
2318 #endif
2319
2320 /**
2321  * il_is_lq_table_valid() - Test one aspect of LQ cmd for validity
2322  *
2323  * It sometimes happens when a HT rate has been in use and we
2324  * loose connectivity with AP then mac80211 will first tell us that the
2325  * current channel is not HT anymore before removing the station. In such a
2326  * scenario the RXON flags will be updated to indicate we are not
2327  * communicating HT anymore, but the LQ command may still contain HT rates.
2328  * Test for this to prevent driver from sending LQ command between the time
2329  * RXON flags are updated and when LQ command is updated.
2330  */
2331 static bool
2332 il_is_lq_table_valid(struct il_priv *il, struct il_link_quality_cmd *lq)
2333 {
2334         int i;
2335
2336         if (il->ht.enabled)
2337                 return true;
2338
2339         D_INFO("Channel %u is not an HT channel\n", il->active.channel);
2340         for (i = 0; i < LINK_QUAL_MAX_RETRY_NUM; i++) {
2341                 if (le32_to_cpu(lq->rs_table[i].rate_n_flags) & RATE_MCS_HT_MSK) {
2342                         D_INFO("idx %d of LQ expects HT channel\n", i);
2343                         return false;
2344                 }
2345         }
2346         return true;
2347 }
2348
2349 /**
2350  * il_send_lq_cmd() - Send link quality command
2351  * @init: This command is sent as part of station initialization right
2352  *        after station has been added.
2353  *
2354  * The link quality command is sent as the last step of station creation.
2355  * This is the special case in which init is set and we call a callback in
2356  * this case to clear the state indicating that station creation is in
2357  * progress.
2358  */
2359 int
2360 il_send_lq_cmd(struct il_priv *il, struct il_link_quality_cmd *lq,
2361                u8 flags, bool init)
2362 {
2363         int ret = 0;
2364         unsigned long flags_spin;
2365
2366         struct il_host_cmd cmd = {
2367                 .id = C_TX_LINK_QUALITY_CMD,
2368                 .len = sizeof(struct il_link_quality_cmd),
2369                 .flags = flags,
2370                 .data = lq,
2371         };
2372
2373         if (WARN_ON(lq->sta_id == IL_INVALID_STATION))
2374                 return -EINVAL;
2375
2376         spin_lock_irqsave(&il->sta_lock, flags_spin);
2377         if (!(il->stations[lq->sta_id].used & IL_STA_DRIVER_ACTIVE)) {
2378                 spin_unlock_irqrestore(&il->sta_lock, flags_spin);
2379                 return -EINVAL;
2380         }
2381         spin_unlock_irqrestore(&il->sta_lock, flags_spin);
2382
2383         il_dump_lq_cmd(il, lq);
2384         BUG_ON(init && (cmd.flags & CMD_ASYNC));
2385
2386         if (il_is_lq_table_valid(il, lq))
2387                 ret = il_send_cmd(il, &cmd);
2388         else
2389                 ret = -EINVAL;
2390
2391         if (cmd.flags & CMD_ASYNC)
2392                 return ret;
2393
2394         if (init) {
2395                 D_INFO("init LQ command complete,"
2396                        " clearing sta addition status for sta %d\n",
2397                        lq->sta_id);
2398                 spin_lock_irqsave(&il->sta_lock, flags_spin);
2399                 il->stations[lq->sta_id].used &= ~IL_STA_UCODE_INPROGRESS;
2400                 spin_unlock_irqrestore(&il->sta_lock, flags_spin);
2401         }
2402         return ret;
2403 }
2404 EXPORT_SYMBOL(il_send_lq_cmd);
2405
2406 int
2407 il_mac_sta_remove(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
2408                   struct ieee80211_sta *sta)
2409 {
2410         struct il_priv *il = hw->priv;
2411         struct il_station_priv_common *sta_common = (void *)sta->drv_priv;
2412         int ret;
2413
2414         mutex_lock(&il->mutex);
2415         D_MAC80211("enter station %pM\n", sta->addr);
2416
2417         ret = il_remove_station(il, sta_common->sta_id, sta->addr);
2418         if (ret)
2419                 IL_ERR("Error removing station %pM\n", sta->addr);
2420
2421         D_MAC80211("leave ret %d\n", ret);
2422         mutex_unlock(&il->mutex);
2423
2424         return ret;
2425 }
2426 EXPORT_SYMBOL(il_mac_sta_remove);
2427
2428 /************************** RX-FUNCTIONS ****************************/
2429 /*
2430  * Rx theory of operation
2431  *
2432  * Driver allocates a circular buffer of Receive Buffer Descriptors (RBDs),
2433  * each of which point to Receive Buffers to be filled by the NIC.  These get
2434  * used not only for Rx frames, but for any command response or notification
2435  * from the NIC.  The driver and NIC manage the Rx buffers by means
2436  * of idxes into the circular buffer.
2437  *
2438  * Rx Queue Indexes
2439  * The host/firmware share two idx registers for managing the Rx buffers.
2440  *
2441  * The READ idx maps to the first position that the firmware may be writing
2442  * to -- the driver can read up to (but not including) this position and get
2443  * good data.
2444  * The READ idx is managed by the firmware once the card is enabled.
2445  *
2446  * The WRITE idx maps to the last position the driver has read from -- the
2447  * position preceding WRITE is the last slot the firmware can place a packet.
2448  *
2449  * The queue is empty (no good data) if WRITE = READ - 1, and is full if
2450  * WRITE = READ.
2451  *
2452  * During initialization, the host sets up the READ queue position to the first
2453  * IDX position, and WRITE to the last (READ - 1 wrapped)
2454  *
2455  * When the firmware places a packet in a buffer, it will advance the READ idx
2456  * and fire the RX interrupt.  The driver can then query the READ idx and
2457  * process as many packets as possible, moving the WRITE idx forward as it
2458  * resets the Rx queue buffers with new memory.
2459  *
2460  * The management in the driver is as follows:
2461  * + A list of pre-allocated SKBs is stored in iwl->rxq->rx_free.  When
2462  *   iwl->rxq->free_count drops to or below RX_LOW_WATERMARK, work is scheduled
2463  *   to replenish the iwl->rxq->rx_free.
2464  * + In il_rx_replenish (scheduled) if 'processed' != 'read' then the
2465  *   iwl->rxq is replenished and the READ IDX is updated (updating the
2466  *   'processed' and 'read' driver idxes as well)
2467  * + A received packet is processed and handed to the kernel network stack,
2468  *   detached from the iwl->rxq.  The driver 'processed' idx is updated.
2469  * + The Host/Firmware iwl->rxq is replenished at tasklet time from the rx_free
2470  *   list. If there are no allocated buffers in iwl->rxq->rx_free, the READ
2471  *   IDX is not incremented and iwl->status(RX_STALLED) is set.  If there
2472  *   were enough free buffers and RX_STALLED is set it is cleared.
2473  *
2474  *
2475  * Driver sequence:
2476  *
2477  * il_rx_queue_alloc()   Allocates rx_free
2478  * il_rx_replenish()     Replenishes rx_free list from rx_used, and calls
2479  *                            il_rx_queue_restock
2480  * il_rx_queue_restock() Moves available buffers from rx_free into Rx
2481  *                            queue, updates firmware pointers, and updates
2482  *                            the WRITE idx.  If insufficient rx_free buffers
2483  *                            are available, schedules il_rx_replenish
2484  *
2485  * -- enable interrupts --
2486  * ISR - il_rx()         Detach il_rx_bufs from pool up to the
2487  *                            READ IDX, detaching the SKB from the pool.
2488  *                            Moves the packet buffer from queue to rx_used.
2489  *                            Calls il_rx_queue_restock to refill any empty
2490  *                            slots.
2491  * ...
2492  *
2493  */
2494
2495 /**
2496  * il_rx_queue_space - Return number of free slots available in queue.
2497  */
2498 int
2499 il_rx_queue_space(const struct il_rx_queue *q)
2500 {
2501         int s = q->read - q->write;
2502         if (s <= 0)
2503                 s += RX_QUEUE_SIZE;
2504         /* keep some buffer to not confuse full and empty queue */
2505         s -= 2;
2506         if (s < 0)
2507                 s = 0;
2508         return s;
2509 }
2510 EXPORT_SYMBOL(il_rx_queue_space);
2511
2512 /**
2513  * il_rx_queue_update_write_ptr - Update the write pointer for the RX queue
2514  */
2515 void
2516 il_rx_queue_update_write_ptr(struct il_priv *il, struct il_rx_queue *q)
2517 {
2518         unsigned long flags;
2519         u32 rx_wrt_ptr_reg = il->hw_params.rx_wrt_ptr_reg;
2520         u32 reg;
2521
2522         spin_lock_irqsave(&q->lock, flags);
2523
2524         if (q->need_update == 0)
2525                 goto exit_unlock;
2526
2527         /* If power-saving is in use, make sure device is awake */
2528         if (test_bit(S_POWER_PMI, &il->status)) {
2529                 reg = _il_rd(il, CSR_UCODE_DRV_GP1);
2530
2531                 if (reg & CSR_UCODE_DRV_GP1_BIT_MAC_SLEEP) {
2532                         D_INFO("Rx queue requesting wakeup," " GP1 = 0x%x\n",
2533                                reg);
2534                         il_set_bit(il, CSR_GP_CNTRL,
2535                                    CSR_GP_CNTRL_REG_FLAG_MAC_ACCESS_REQ);
2536                         goto exit_unlock;
2537                 }
2538
2539                 q->write_actual = (q->write & ~0x7);
2540                 il_wr(il, rx_wrt_ptr_reg, q->write_actual);
2541
2542                 /* Else device is assumed to be awake */
2543         } else {
2544                 /* Device expects a multiple of 8 */
2545                 q->write_actual = (q->write & ~0x7);
2546                 il_wr(il, rx_wrt_ptr_reg, q->write_actual);
2547         }
2548
2549         q->need_update = 0;
2550
2551 exit_unlock:
2552         spin_unlock_irqrestore(&q->lock, flags);
2553 }
2554 EXPORT_SYMBOL(il_rx_queue_update_write_ptr);
2555
2556 int
2557 il_rx_queue_alloc(struct il_priv *il)
2558 {
2559         struct il_rx_queue *rxq = &il->rxq;
2560         struct device *dev = &il->pci_dev->dev;
2561         int i;
2562
2563         spin_lock_init(&rxq->lock);
2564         INIT_LIST_HEAD(&rxq->rx_free);
2565         INIT_LIST_HEAD(&rxq->rx_used);
2566
2567         /* Alloc the circular buffer of Read Buffer Descriptors (RBDs) */
2568         rxq->bd = dma_alloc_coherent(dev, 4 * RX_QUEUE_SIZE, &rxq->bd_dma,
2569                                      GFP_KERNEL);
2570         if (!rxq->bd)
2571                 goto err_bd;
2572
2573         rxq->rb_stts = dma_alloc_coherent(dev, sizeof(struct il_rb_status),
2574                                           &rxq->rb_stts_dma, GFP_KERNEL);
2575         if (!rxq->rb_stts)
2576                 goto err_rb;
2577
2578         /* Fill the rx_used queue with _all_ of the Rx buffers */
2579         for (i = 0; i < RX_FREE_BUFFERS + RX_QUEUE_SIZE; i++)
2580                 list_add_tail(&rxq->pool[i].list, &rxq->rx_used);
2581
2582         /* Set us so that we have processed and used all buffers, but have
2583          * not restocked the Rx queue with fresh buffers */
2584         rxq->read = rxq->write = 0;
2585         rxq->write_actual = 0;
2586         rxq->free_count = 0;
2587         rxq->need_update = 0;
2588         return 0;
2589
2590 err_rb:
2591         dma_free_coherent(&il->pci_dev->dev, 4 * RX_QUEUE_SIZE, rxq->bd,
2592                           rxq->bd_dma);
2593 err_bd:
2594         return -ENOMEM;
2595 }
2596 EXPORT_SYMBOL(il_rx_queue_alloc);
2597
2598 void
2599 il_hdl_spectrum_measurement(struct il_priv *il, struct il_rx_buf *rxb)
2600 {
2601         struct il_rx_pkt *pkt = rxb_addr(rxb);
2602         struct il_spectrum_notification *report = &(pkt->u.spectrum_notif);
2603
2604         if (!report->state) {
2605                 D_11H("Spectrum Measure Notification: Start\n");
2606                 return;
2607         }
2608
2609         memcpy(&il->measure_report, report, sizeof(*report));
2610         il->measurement_status |= MEASUREMENT_READY;
2611 }
2612 EXPORT_SYMBOL(il_hdl_spectrum_measurement);
2613
2614 /*
2615  * returns non-zero if packet should be dropped
2616  */
2617 int
2618 il_set_decrypted_flag(struct il_priv *il, struct ieee80211_hdr *hdr,
2619                       u32 decrypt_res, struct ieee80211_rx_status *stats)
2620 {
2621         u16 fc = le16_to_cpu(hdr->frame_control);
2622
2623         /*
2624          * All contexts have the same setting here due to it being
2625          * a module parameter, so OK to check any context.
2626          */
2627         if (il->active.filter_flags & RXON_FILTER_DIS_DECRYPT_MSK)
2628                 return 0;
2629
2630         if (!(fc & IEEE80211_FCTL_PROTECTED))
2631                 return 0;
2632
2633         D_RX("decrypt_res:0x%x\n", decrypt_res);
2634         switch (decrypt_res & RX_RES_STATUS_SEC_TYPE_MSK) {
2635         case RX_RES_STATUS_SEC_TYPE_TKIP:
2636                 /* The uCode has got a bad phase 1 Key, pushes the packet.
2637                  * Decryption will be done in SW. */
2638                 if ((decrypt_res & RX_RES_STATUS_DECRYPT_TYPE_MSK) ==
2639                     RX_RES_STATUS_BAD_KEY_TTAK)
2640                         break;
2641
2642         case RX_RES_STATUS_SEC_TYPE_WEP:
2643                 if ((decrypt_res & RX_RES_STATUS_DECRYPT_TYPE_MSK) ==
2644                     RX_RES_STATUS_BAD_ICV_MIC) {
2645                         /* bad ICV, the packet is destroyed since the
2646                          * decryption is inplace, drop it */
2647                         D_RX("Packet destroyed\n");
2648                         return -1;
2649                 }
2650         case RX_RES_STATUS_SEC_TYPE_CCMP:
2651                 if ((decrypt_res & RX_RES_STATUS_DECRYPT_TYPE_MSK) ==
2652                     RX_RES_STATUS_DECRYPT_OK) {
2653                         D_RX("hw decrypt successfully!!!\n");
2654                         stats->flag |= RX_FLAG_DECRYPTED;
2655                 }
2656                 break;
2657
2658         default:
2659                 break;
2660         }
2661         return 0;
2662 }
2663 EXPORT_SYMBOL(il_set_decrypted_flag);
2664
2665 /**
2666  * il_txq_update_write_ptr - Send new write idx to hardware
2667  */
2668 void
2669 il_txq_update_write_ptr(struct il_priv *il, struct il_tx_queue *txq)
2670 {
2671         u32 reg = 0;
2672         int txq_id = txq->q.id;
2673
2674         if (txq->need_update == 0)
2675                 return;
2676
2677         /* if we're trying to save power */
2678         if (test_bit(S_POWER_PMI, &il->status)) {
2679                 /* wake up nic if it's powered down ...
2680                  * uCode will wake up, and interrupt us again, so next
2681                  * time we'll skip this part. */
2682                 reg = _il_rd(il, CSR_UCODE_DRV_GP1);
2683
2684                 if (reg & CSR_UCODE_DRV_GP1_BIT_MAC_SLEEP) {
2685                         D_INFO("Tx queue %d requesting wakeup," " GP1 = 0x%x\n",
2686                                txq_id, reg);
2687                         il_set_bit(il, CSR_GP_CNTRL,
2688                                    CSR_GP_CNTRL_REG_FLAG_MAC_ACCESS_REQ);
2689                         return;
2690                 }
2691
2692                 il_wr(il, HBUS_TARG_WRPTR, txq->q.write_ptr | (txq_id << 8));
2693
2694                 /*
2695                  * else not in power-save mode,
2696                  * uCode will never sleep when we're
2697                  * trying to tx (during RFKILL, we're not trying to tx).
2698                  */
2699         } else
2700                 _il_wr(il, HBUS_TARG_WRPTR, txq->q.write_ptr | (txq_id << 8));
2701         txq->need_update = 0;
2702 }
2703 EXPORT_SYMBOL(il_txq_update_write_ptr);
2704
2705 /**
2706  * il_tx_queue_unmap -  Unmap any remaining DMA mappings and free skb's
2707  */
2708 void
2709 il_tx_queue_unmap(struct il_priv *il, int txq_id)
2710 {
2711         struct il_tx_queue *txq = &il->txq[txq_id];
2712         struct il_queue *q = &txq->q;
2713
2714         if (q->n_bd == 0)
2715                 return;
2716
2717         while (q->write_ptr != q->read_ptr) {
2718                 il->ops->txq_free_tfd(il, txq);
2719                 q->read_ptr = il_queue_inc_wrap(q->read_ptr, q->n_bd);
2720         }
2721 }
2722 EXPORT_SYMBOL(il_tx_queue_unmap);
2723
2724 /**
2725  * il_tx_queue_free - Deallocate DMA queue.
2726  * @txq: Transmit queue to deallocate.
2727  *
2728  * Empty queue by removing and destroying all BD's.
2729  * Free all buffers.
2730  * 0-fill, but do not free "txq" descriptor structure.
2731  */
2732 void
2733 il_tx_queue_free(struct il_priv *il, int txq_id)
2734 {
2735         struct il_tx_queue *txq = &il->txq[txq_id];
2736         struct device *dev = &il->pci_dev->dev;
2737         int i;
2738
2739         il_tx_queue_unmap(il, txq_id);
2740
2741         /* De-alloc array of command/tx buffers */
2742         for (i = 0; i < TFD_TX_CMD_SLOTS; i++)
2743                 kfree(txq->cmd[i]);
2744
2745         /* De-alloc circular buffer of TFDs */
2746         if (txq->q.n_bd)
2747                 dma_free_coherent(dev, il->hw_params.tfd_size * txq->q.n_bd,
2748                                   txq->tfds, txq->q.dma_addr);
2749
2750         /* De-alloc array of per-TFD driver data */
2751         kfree(txq->skbs);
2752         txq->skbs = NULL;
2753
2754         /* deallocate arrays */
2755         kfree(txq->cmd);
2756         kfree(txq->meta);
2757         txq->cmd = NULL;
2758         txq->meta = NULL;
2759
2760         /* 0-fill queue descriptor structure */
2761         memset(txq, 0, sizeof(*txq));
2762 }
2763 EXPORT_SYMBOL(il_tx_queue_free);
2764
2765 /**
2766  * il_cmd_queue_unmap - Unmap any remaining DMA mappings from command queue
2767  */
2768 void
2769 il_cmd_queue_unmap(struct il_priv *il)
2770 {
2771         struct il_tx_queue *txq = &il->txq[il->cmd_queue];
2772         struct il_queue *q = &txq->q;
2773         int i;
2774
2775         if (q->n_bd == 0)
2776                 return;
2777
2778         while (q->read_ptr != q->write_ptr) {
2779                 i = il_get_cmd_idx(q, q->read_ptr, 0);
2780
2781                 if (txq->meta[i].flags & CMD_MAPPED) {
2782                         pci_unmap_single(il->pci_dev,
2783                                          dma_unmap_addr(&txq->meta[i], mapping),
2784                                          dma_unmap_len(&txq->meta[i], len),
2785                                          PCI_DMA_BIDIRECTIONAL);
2786                         txq->meta[i].flags = 0;
2787                 }
2788
2789                 q->read_ptr = il_queue_inc_wrap(q->read_ptr, q->n_bd);
2790         }
2791
2792         i = q->n_win;
2793         if (txq->meta[i].flags & CMD_MAPPED) {
2794                 pci_unmap_single(il->pci_dev,
2795                                  dma_unmap_addr(&txq->meta[i], mapping),
2796                                  dma_unmap_len(&txq->meta[i], len),
2797                                  PCI_DMA_BIDIRECTIONAL);
2798                 txq->meta[i].flags = 0;
2799         }
2800 }
2801 EXPORT_SYMBOL(il_cmd_queue_unmap);
2802
2803 /**
2804  * il_cmd_queue_free - Deallocate DMA queue.
2805  * @txq: Transmit queue to deallocate.
2806  *
2807  * Empty queue by removing and destroying all BD's.
2808  * Free all buffers.
2809  * 0-fill, but do not free "txq" descriptor structure.
2810  */
2811 void
2812 il_cmd_queue_free(struct il_priv *il)
2813 {
2814         struct il_tx_queue *txq = &il->txq[il->cmd_queue];
2815         struct device *dev = &il->pci_dev->dev;
2816         int i;
2817
2818         il_cmd_queue_unmap(il);
2819
2820         /* De-alloc array of command/tx buffers */
2821         for (i = 0; i <= TFD_CMD_SLOTS; i++)
2822                 kfree(txq->cmd[i]);
2823
2824         /* De-alloc circular buffer of TFDs */
2825         if (txq->q.n_bd)
2826                 dma_free_coherent(dev, il->hw_params.tfd_size * txq->q.n_bd,
2827                                   txq->tfds, txq->q.dma_addr);
2828
2829         /* deallocate arrays */
2830         kfree(txq->cmd);
2831         kfree(txq->meta);
2832         txq->cmd = NULL;
2833         txq->meta = NULL;
2834
2835         /* 0-fill queue descriptor structure */
2836         memset(txq, 0, sizeof(*txq));
2837 }
2838 EXPORT_SYMBOL(il_cmd_queue_free);
2839
2840 /*************** DMA-QUEUE-GENERAL-FUNCTIONS  *****
2841  * DMA services
2842  *
2843  * Theory of operation
2844  *
2845  * A Tx or Rx queue resides in host DRAM, and is comprised of a circular buffer
2846  * of buffer descriptors, each of which points to one or more data buffers for
2847  * the device to read from or fill.  Driver and device exchange status of each
2848  * queue via "read" and "write" pointers.  Driver keeps minimum of 2 empty
2849  * entries in each circular buffer, to protect against confusing empty and full
2850  * queue states.
2851  *
2852  * The device reads or writes the data in the queues via the device's several
2853  * DMA/FIFO channels.  Each queue is mapped to a single DMA channel.
2854  *
2855  * For Tx queue, there are low mark and high mark limits. If, after queuing
2856  * the packet for Tx, free space become < low mark, Tx queue stopped. When
2857  * reclaiming packets (on 'tx done IRQ), if free space become > high mark,
2858  * Tx queue resumed.
2859  *
2860  * See more detailed info in 4965.h.
2861  ***************************************************/
2862
2863 int
2864 il_queue_space(const struct il_queue *q)
2865 {
2866         int s = q->read_ptr - q->write_ptr;
2867
2868         if (q->read_ptr > q->write_ptr)
2869                 s -= q->n_bd;
2870
2871         if (s <= 0)
2872                 s += q->n_win;
2873         /* keep some reserve to not confuse empty and full situations */
2874         s -= 2;
2875         if (s < 0)
2876                 s = 0;
2877         return s;
2878 }
2879 EXPORT_SYMBOL(il_queue_space);
2880
2881
2882 /**
2883  * il_queue_init - Initialize queue's high/low-water and read/write idxes
2884  */
2885 static int
2886 il_queue_init(struct il_priv *il, struct il_queue *q, int slots, u32 id)
2887 {
2888         /*
2889          * TFD_QUEUE_SIZE_MAX must be power-of-two size, otherwise
2890          * il_queue_inc_wrap and il_queue_dec_wrap are broken.
2891          */
2892         BUILD_BUG_ON(TFD_QUEUE_SIZE_MAX & (TFD_QUEUE_SIZE_MAX - 1));
2893         /* FIXME: remove q->n_bd */
2894         q->n_bd = TFD_QUEUE_SIZE_MAX;
2895
2896         q->n_win = slots;
2897         q->id = id;
2898
2899         /* slots_must be power-of-two size, otherwise
2900          * il_get_cmd_idx is broken. */
2901         BUG_ON(!is_power_of_2(slots));
2902
2903         q->low_mark = q->n_win / 4;
2904         if (q->low_mark < 4)
2905                 q->low_mark = 4;
2906
2907         q->high_mark = q->n_win / 8;
2908         if (q->high_mark < 2)
2909                 q->high_mark = 2;
2910
2911         q->write_ptr = q->read_ptr = 0;
2912
2913         return 0;
2914 }
2915
2916 /**
2917  * il_tx_queue_alloc - Alloc driver data and TFD CB for one Tx/cmd queue
2918  */
2919 static int
2920 il_tx_queue_alloc(struct il_priv *il, struct il_tx_queue *txq, u32 id)
2921 {
2922         struct device *dev = &il->pci_dev->dev;
2923         size_t tfd_sz = il->hw_params.tfd_size * TFD_QUEUE_SIZE_MAX;
2924
2925         /* Driver ilate data, only for Tx (not command) queues,
2926          * not shared with device. */
2927         if (id != il->cmd_queue) {
2928                 txq->skbs = kcalloc(TFD_QUEUE_SIZE_MAX, sizeof(struct skb *),
2929                                     GFP_KERNEL);
2930                 if (!txq->skbs) {
2931                         IL_ERR("Fail to alloc skbs\n");
2932                         goto error;
2933                 }
2934         } else
2935                 txq->skbs = NULL;
2936
2937         /* Circular buffer of transmit frame descriptors (TFDs),
2938          * shared with device */
2939         txq->tfds =
2940             dma_alloc_coherent(dev, tfd_sz, &txq->q.dma_addr, GFP_KERNEL);
2941         if (!txq->tfds)
2942                 goto error;
2943
2944         txq->q.id = id;
2945
2946         return 0;
2947
2948 error:
2949         kfree(txq->skbs);
2950         txq->skbs = NULL;
2951
2952         return -ENOMEM;
2953 }
2954
2955 /**
2956  * il_tx_queue_init - Allocate and initialize one tx/cmd queue
2957  */
2958 int
2959 il_tx_queue_init(struct il_priv *il, u32 txq_id)
2960 {
2961         int i, len, ret;
2962         int slots, actual_slots;
2963         struct il_tx_queue *txq = &il->txq[txq_id];
2964
2965         /*
2966          * Alloc buffer array for commands (Tx or other types of commands).
2967          * For the command queue (#4/#9), allocate command space + one big
2968          * command for scan, since scan command is very huge; the system will
2969          * not have two scans at the same time, so only one is needed.
2970          * For normal Tx queues (all other queues), no super-size command
2971          * space is needed.
2972          */
2973         if (txq_id == il->cmd_queue) {
2974                 slots = TFD_CMD_SLOTS;
2975                 actual_slots = slots + 1;
2976         } else {
2977                 slots = TFD_TX_CMD_SLOTS;
2978                 actual_slots = slots;
2979         }
2980
2981         txq->meta =
2982             kzalloc(sizeof(struct il_cmd_meta) * actual_slots, GFP_KERNEL);
2983         txq->cmd =
2984             kzalloc(sizeof(struct il_device_cmd *) * actual_slots, GFP_KERNEL);
2985
2986         if (!txq->meta || !txq->cmd)
2987                 goto out_free_arrays;
2988
2989         len = sizeof(struct il_device_cmd);
2990         for (i = 0; i < actual_slots; i++) {
2991                 /* only happens for cmd queue */
2992                 if (i == slots)
2993                         len = IL_MAX_CMD_SIZE;
2994
2995                 txq->cmd[i] = kmalloc(len, GFP_KERNEL);
2996                 if (!txq->cmd[i])
2997                         goto err;
2998         }
2999
3000         /* Alloc driver data array and TFD circular buffer */
3001         ret = il_tx_queue_alloc(il, txq, txq_id);
3002         if (ret)
3003                 goto err;
3004
3005         txq->need_update = 0;
3006
3007         /*
3008          * For the default queues 0-3, set up the swq_id
3009          * already -- all others need to get one later
3010          * (if they need one at all).
3011          */
3012         if (txq_id < 4)
3013                 il_set_swq_id(txq, txq_id, txq_id);
3014
3015         /* Initialize queue's high/low-water marks, and head/tail idxes */
3016         il_queue_init(il, &txq->q, slots, txq_id);
3017
3018         /* Tell device where to find queue */
3019         il->ops->txq_init(il, txq);
3020
3021         return 0;
3022 err:
3023         for (i = 0; i < actual_slots; i++)
3024                 kfree(txq->cmd[i]);
3025 out_free_arrays:
3026         kfree(txq->meta);
3027         kfree(txq->cmd);
3028
3029         return -ENOMEM;
3030 }
3031 EXPORT_SYMBOL(il_tx_queue_init);
3032
3033 void
3034 il_tx_queue_reset(struct il_priv *il, u32 txq_id)
3035 {
3036         int slots, actual_slots;
3037         struct il_tx_queue *txq = &il->txq[txq_id];
3038
3039         if (txq_id == il->cmd_queue) {
3040                 slots = TFD_CMD_SLOTS;
3041                 actual_slots = TFD_CMD_SLOTS + 1;
3042         } else {
3043                 slots = TFD_TX_CMD_SLOTS;
3044                 actual_slots = TFD_TX_CMD_SLOTS;
3045         }
3046
3047         memset(txq->meta, 0, sizeof(struct il_cmd_meta) * actual_slots);
3048         txq->need_update = 0;
3049
3050         /* Initialize queue's high/low-water marks, and head/tail idxes */
3051         il_queue_init(il, &txq->q, slots, txq_id);
3052
3053         /* Tell device where to find queue */
3054         il->ops->txq_init(il, txq);
3055 }
3056 EXPORT_SYMBOL(il_tx_queue_reset);
3057
3058 /*************** HOST COMMAND QUEUE FUNCTIONS   *****/
3059
3060 /**
3061  * il_enqueue_hcmd - enqueue a uCode command
3062  * @il: device ilate data point
3063  * @cmd: a point to the ucode command structure
3064  *
3065  * The function returns < 0 values to indicate the operation is
3066  * failed. On success, it turns the idx (> 0) of command in the
3067  * command queue.
3068  */
3069 int
3070 il_enqueue_hcmd(struct il_priv *il, struct il_host_cmd *cmd)
3071 {
3072         struct il_tx_queue *txq = &il->txq[il->cmd_queue];
3073         struct il_queue *q = &txq->q;
3074         struct il_device_cmd *out_cmd;
3075         struct il_cmd_meta *out_meta;
3076         dma_addr_t phys_addr;
3077         unsigned long flags;
3078         int len;
3079         u32 idx;
3080         u16 fix_size;
3081
3082         cmd->len = il->ops->get_hcmd_size(cmd->id, cmd->len);
3083         fix_size = (u16) (cmd->len + sizeof(out_cmd->hdr));
3084
3085         /* If any of the command structures end up being larger than
3086          * the TFD_MAX_PAYLOAD_SIZE, and it sent as a 'small' command then
3087          * we will need to increase the size of the TFD entries
3088          * Also, check to see if command buffer should not exceed the size
3089          * of device_cmd and max_cmd_size. */
3090         BUG_ON((fix_size > TFD_MAX_PAYLOAD_SIZE) &&
3091                !(cmd->flags & CMD_SIZE_HUGE));
3092         BUG_ON(fix_size > IL_MAX_CMD_SIZE);
3093
3094         if (il_is_rfkill(il) || il_is_ctkill(il)) {
3095                 IL_WARN("Not sending command - %s KILL\n",
3096                         il_is_rfkill(il) ? "RF" : "CT");
3097                 return -EIO;
3098         }
3099
3100         spin_lock_irqsave(&il->hcmd_lock, flags);
3101
3102         if (il_queue_space(q) < ((cmd->flags & CMD_ASYNC) ? 2 : 1)) {
3103                 spin_unlock_irqrestore(&il->hcmd_lock, flags);
3104
3105                 IL_ERR("Restarting adapter due to command queue full\n");
3106                 queue_work(il->workqueue, &il->restart);
3107                 return -ENOSPC;
3108         }
3109
3110         idx = il_get_cmd_idx(q, q->write_ptr, cmd->flags & CMD_SIZE_HUGE);
3111         out_cmd = txq->cmd[idx];
3112         out_meta = &txq->meta[idx];
3113
3114         if (WARN_ON(out_meta->flags & CMD_MAPPED)) {
3115                 spin_unlock_irqrestore(&il->hcmd_lock, flags);
3116                 return -ENOSPC;
3117         }
3118
3119         memset(out_meta, 0, sizeof(*out_meta)); /* re-initialize to NULL */
3120         out_meta->flags = cmd->flags | CMD_MAPPED;
3121         if (cmd->flags & CMD_WANT_SKB)
3122                 out_meta->source = cmd;
3123         if (cmd->flags & CMD_ASYNC)
3124                 out_meta->callback = cmd->callback;
3125
3126         out_cmd->hdr.cmd = cmd->id;
3127         memcpy(&out_cmd->cmd.payload, cmd->data, cmd->len);
3128
3129         /* At this point, the out_cmd now has all of the incoming cmd
3130          * information */
3131
3132         out_cmd->hdr.flags = 0;
3133         out_cmd->hdr.sequence =
3134             cpu_to_le16(QUEUE_TO_SEQ(il->cmd_queue) | IDX_TO_SEQ(q->write_ptr));
3135         if (cmd->flags & CMD_SIZE_HUGE)
3136                 out_cmd->hdr.sequence |= SEQ_HUGE_FRAME;
3137         len = sizeof(struct il_device_cmd);
3138         if (idx == TFD_CMD_SLOTS)
3139                 len = IL_MAX_CMD_SIZE;
3140
3141 #ifdef CONFIG_IWLEGACY_DEBUG
3142         switch (out_cmd->hdr.cmd) {
3143         case C_TX_LINK_QUALITY_CMD:
3144         case C_SENSITIVITY:
3145                 D_HC_DUMP("Sending command %s (#%x), seq: 0x%04X, "
3146                           "%d bytes at %d[%d]:%d\n",
3147                           il_get_cmd_string(out_cmd->hdr.cmd), out_cmd->hdr.cmd,
3148                           le16_to_cpu(out_cmd->hdr.sequence), fix_size,
3149                           q->write_ptr, idx, il->cmd_queue);
3150                 break;
3151         default:
3152                 D_HC("Sending command %s (#%x), seq: 0x%04X, "
3153                      "%d bytes at %d[%d]:%d\n",
3154                      il_get_cmd_string(out_cmd->hdr.cmd), out_cmd->hdr.cmd,
3155                      le16_to_cpu(out_cmd->hdr.sequence), fix_size, q->write_ptr,
3156                      idx, il->cmd_queue);
3157         }
3158 #endif
3159
3160         phys_addr =
3161             pci_map_single(il->pci_dev, &out_cmd->hdr, fix_size,
3162                            PCI_DMA_BIDIRECTIONAL);
3163         if (unlikely(pci_dma_mapping_error(il->pci_dev, phys_addr))) {
3164                 idx = -ENOMEM;
3165                 goto out;
3166         }
3167         dma_unmap_addr_set(out_meta, mapping, phys_addr);
3168         dma_unmap_len_set(out_meta, len, fix_size);
3169
3170         txq->need_update = 1;
3171
3172         if (il->ops->txq_update_byte_cnt_tbl)
3173                 /* Set up entry in queue's byte count circular buffer */
3174                 il->ops->txq_update_byte_cnt_tbl(il, txq, 0);
3175
3176         il->ops->txq_attach_buf_to_tfd(il, txq, phys_addr, fix_size, 1,
3177                                             U32_PAD(cmd->len));
3178
3179         /* Increment and update queue's write idx */
3180         q->write_ptr = il_queue_inc_wrap(q->write_ptr, q->n_bd);
3181         il_txq_update_write_ptr(il, txq);
3182
3183 out:
3184         spin_unlock_irqrestore(&il->hcmd_lock, flags);
3185         return idx;
3186 }
3187
3188 /**
3189  * il_hcmd_queue_reclaim - Reclaim TX command queue entries already Tx'd
3190  *
3191  * When FW advances 'R' idx, all entries between old and new 'R' idx
3192  * need to be reclaimed. As result, some free space forms.  If there is
3193  * enough free space (> low mark), wake the stack that feeds us.
3194  */
3195 static void
3196 il_hcmd_queue_reclaim(struct il_priv *il, int txq_id, int idx, int cmd_idx)
3197 {
3198         struct il_tx_queue *txq = &il->txq[txq_id];
3199         struct il_queue *q = &txq->q;
3200         int nfreed = 0;
3201
3202         if (idx >= q->n_bd || il_queue_used(q, idx) == 0) {
3203                 IL_ERR("Read idx for DMA queue txq id (%d), idx %d, "
3204                        "is out of range [0-%d] %d %d.\n", txq_id, idx, q->n_bd,
3205                        q->write_ptr, q->read_ptr);
3206                 return;
3207         }
3208
3209         for (idx = il_queue_inc_wrap(idx, q->n_bd); q->read_ptr != idx;
3210              q->read_ptr = il_queue_inc_wrap(q->read_ptr, q->n_bd)) {
3211
3212                 if (nfreed++ > 0) {
3213                         IL_ERR("HCMD skipped: idx (%d) %d %d\n", idx,
3214                                q->write_ptr, q->read_ptr);
3215                         queue_work(il->workqueue, &il->restart);
3216                 }
3217
3218         }
3219 }
3220
3221 /**
3222  * il_tx_cmd_complete - Pull unused buffers off the queue and reclaim them
3223  * @rxb: Rx buffer to reclaim
3224  *
3225  * If an Rx buffer has an async callback associated with it the callback
3226  * will be executed.  The attached skb (if present) will only be freed
3227  * if the callback returns 1
3228  */
3229 void
3230 il_tx_cmd_complete(struct il_priv *il, struct il_rx_buf *rxb)
3231 {
3232         struct il_rx_pkt *pkt = rxb_addr(rxb);
3233         u16 sequence = le16_to_cpu(pkt->hdr.sequence);
3234         int txq_id = SEQ_TO_QUEUE(sequence);
3235         int idx = SEQ_TO_IDX(sequence);
3236         int cmd_idx;
3237         bool huge = !!(pkt->hdr.sequence & SEQ_HUGE_FRAME);
3238         struct il_device_cmd *cmd;
3239         struct il_cmd_meta *meta;
3240         struct il_tx_queue *txq = &il->txq[il->cmd_queue];
3241         unsigned long flags;
3242
3243         /* If a Tx command is being handled and it isn't in the actual
3244          * command queue then there a command routing bug has been introduced
3245          * in the queue management code. */
3246         if (WARN
3247             (txq_id != il->cmd_queue,
3248              "wrong command queue %d (should be %d), sequence 0x%X readp=%d writep=%d\n",
3249              txq_id, il->cmd_queue, sequence, il->txq[il->cmd_queue].q.read_ptr,
3250              il->txq[il->cmd_queue].q.write_ptr)) {
3251                 il_print_hex_error(il, pkt, 32);
3252                 return;
3253         }
3254
3255         cmd_idx = il_get_cmd_idx(&txq->q, idx, huge);
3256         cmd = txq->cmd[cmd_idx];
3257         meta = &txq->meta[cmd_idx];
3258
3259         txq->time_stamp = jiffies;
3260
3261         pci_unmap_single(il->pci_dev, dma_unmap_addr(meta, mapping),
3262                          dma_unmap_len(meta, len), PCI_DMA_BIDIRECTIONAL);
3263
3264         /* Input error checking is done when commands are added to queue. */
3265         if (meta->flags & CMD_WANT_SKB) {
3266                 meta->source->reply_page = (unsigned long)rxb_addr(rxb);
3267                 rxb->page = NULL;
3268         } else if (meta->callback)
3269                 meta->callback(il, cmd, pkt);
3270
3271         spin_lock_irqsave(&il->hcmd_lock, flags);
3272
3273         il_hcmd_queue_reclaim(il, txq_id, idx, cmd_idx);
3274
3275         if (!(meta->flags & CMD_ASYNC)) {
3276                 clear_bit(S_HCMD_ACTIVE, &il->status);
3277                 D_INFO("Clearing HCMD_ACTIVE for command %s\n",
3278                        il_get_cmd_string(cmd->hdr.cmd));
3279                 wake_up(&il->wait_command_queue);
3280         }
3281
3282         /* Mark as unmapped */
3283         meta->flags = 0;
3284
3285         spin_unlock_irqrestore(&il->hcmd_lock, flags);
3286 }
3287 EXPORT_SYMBOL(il_tx_cmd_complete);
3288
3289 MODULE_DESCRIPTION("iwl-legacy: common functions for 3945 and 4965");
3290 MODULE_VERSION(IWLWIFI_VERSION);
3291 MODULE_AUTHOR(DRV_COPYRIGHT " " DRV_AUTHOR);
3292 MODULE_LICENSE("GPL");
3293
3294 /*
3295  * set bt_coex_active to true, uCode will do kill/defer
3296  * every time the priority line is asserted (BT is sending signals on the
3297  * priority line in the PCIx).
3298  * set bt_coex_active to false, uCode will ignore the BT activity and
3299  * perform the normal operation
3300  *
3301  * User might experience transmit issue on some platform due to WiFi/BT
3302  * co-exist problem. The possible behaviors are:
3303  *   Able to scan and finding all the available AP
3304  *   Not able to associate with any AP
3305  * On those platforms, WiFi communication can be restored by set
3306  * "bt_coex_active" module parameter to "false"
3307  *
3308  * default: bt_coex_active = true (BT_COEX_ENABLE)
3309  */
3310 static bool bt_coex_active = true;
3311 module_param(bt_coex_active, bool, S_IRUGO);
3312 MODULE_PARM_DESC(bt_coex_active, "enable wifi/bluetooth co-exist");
3313
3314 u32 il_debug_level;
3315 EXPORT_SYMBOL(il_debug_level);
3316
3317 const u8 il_bcast_addr[ETH_ALEN] = { 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF };
3318 EXPORT_SYMBOL(il_bcast_addr);
3319
3320 #define MAX_BIT_RATE_40_MHZ 150 /* Mbps */
3321 #define MAX_BIT_RATE_20_MHZ 72  /* Mbps */
3322 static void
3323 il_init_ht_hw_capab(const struct il_priv *il,
3324                     struct ieee80211_sta_ht_cap *ht_info,
3325                     enum ieee80211_band band)
3326 {
3327         u16 max_bit_rate = 0;
3328         u8 rx_chains_num = il->hw_params.rx_chains_num;
3329         u8 tx_chains_num = il->hw_params.tx_chains_num;
3330
3331         ht_info->cap = 0;
3332         memset(&ht_info->mcs, 0, sizeof(ht_info->mcs));
3333
3334         ht_info->ht_supported = true;
3335
3336         ht_info->cap |= IEEE80211_HT_CAP_SGI_20;
3337         max_bit_rate = MAX_BIT_RATE_20_MHZ;
3338         if (il->hw_params.ht40_channel & BIT(band)) {
3339                 ht_info->cap |= IEEE80211_HT_CAP_SUP_WIDTH_20_40;
3340                 ht_info->cap |= IEEE80211_HT_CAP_SGI_40;
3341                 ht_info->mcs.rx_mask[4] = 0x01;
3342                 max_bit_rate = MAX_BIT_RATE_40_MHZ;
3343         }
3344
3345         if (il->cfg->mod_params->amsdu_size_8K)
3346                 ht_info->cap |= IEEE80211_HT_CAP_MAX_AMSDU;
3347
3348         ht_info->ampdu_factor = CFG_HT_RX_AMPDU_FACTOR_DEF;
3349         ht_info->ampdu_density = CFG_HT_MPDU_DENSITY_DEF;
3350
3351         ht_info->mcs.rx_mask[0] = 0xFF;
3352         if (rx_chains_num >= 2)
3353                 ht_info->mcs.rx_mask[1] = 0xFF;
3354         if (rx_chains_num >= 3)
3355                 ht_info->mcs.rx_mask[2] = 0xFF;
3356
3357         /* Highest supported Rx data rate */
3358         max_bit_rate *= rx_chains_num;
3359         WARN_ON(max_bit_rate & ~IEEE80211_HT_MCS_RX_HIGHEST_MASK);
3360         ht_info->mcs.rx_highest = cpu_to_le16(max_bit_rate);
3361
3362         /* Tx MCS capabilities */
3363         ht_info->mcs.tx_params = IEEE80211_HT_MCS_TX_DEFINED;
3364         if (tx_chains_num != rx_chains_num) {
3365                 ht_info->mcs.tx_params |= IEEE80211_HT_MCS_TX_RX_DIFF;
3366                 ht_info->mcs.tx_params |=
3367                     ((tx_chains_num -
3368                       1) << IEEE80211_HT_MCS_TX_MAX_STREAMS_SHIFT);
3369         }
3370 }
3371
3372 /**
3373  * il_init_geos - Initialize mac80211's geo/channel info based from eeprom
3374  */
3375 int
3376 il_init_geos(struct il_priv *il)
3377 {
3378         struct il_channel_info *ch;
3379         struct ieee80211_supported_band *sband;
3380         struct ieee80211_channel *channels;
3381         struct ieee80211_channel *geo_ch;
3382         struct ieee80211_rate *rates;
3383         int i = 0;
3384         s8 max_tx_power = 0;
3385
3386         if (il->bands[IEEE80211_BAND_2GHZ].n_bitrates ||
3387             il->bands[IEEE80211_BAND_5GHZ].n_bitrates) {
3388                 D_INFO("Geography modes already initialized.\n");
3389                 set_bit(S_GEO_CONFIGURED, &il->status);
3390                 return 0;
3391         }
3392
3393         channels =
3394             kzalloc(sizeof(struct ieee80211_channel) * il->channel_count,
3395                     GFP_KERNEL);
3396         if (!channels)
3397                 return -ENOMEM;
3398
3399         rates =
3400             kzalloc((sizeof(struct ieee80211_rate) * RATE_COUNT_LEGACY),
3401                     GFP_KERNEL);
3402         if (!rates) {
3403                 kfree(channels);
3404                 return -ENOMEM;
3405         }
3406
3407         /* 5.2GHz channels start after the 2.4GHz channels */
3408         sband = &il->bands[IEEE80211_BAND_5GHZ];
3409         sband->channels = &channels[ARRAY_SIZE(il_eeprom_band_1)];
3410         /* just OFDM */
3411         sband->bitrates = &rates[IL_FIRST_OFDM_RATE];
3412         sband->n_bitrates = RATE_COUNT_LEGACY - IL_FIRST_OFDM_RATE;
3413
3414         if (il->cfg->sku & IL_SKU_N)
3415                 il_init_ht_hw_capab(il, &sband->ht_cap, IEEE80211_BAND_5GHZ);
3416
3417         sband = &il->bands[IEEE80211_BAND_2GHZ];
3418         sband->channels = channels;
3419         /* OFDM & CCK */
3420         sband->bitrates = rates;
3421         sband->n_bitrates = RATE_COUNT_LEGACY;
3422
3423         if (il->cfg->sku & IL_SKU_N)
3424                 il_init_ht_hw_capab(il, &sband->ht_cap, IEEE80211_BAND_2GHZ);
3425
3426         il->ieee_channels = channels;
3427         il->ieee_rates = rates;
3428
3429         for (i = 0; i < il->channel_count; i++) {
3430                 ch = &il->channel_info[i];
3431
3432                 if (!il_is_channel_valid(ch))
3433                         continue;
3434
3435                 sband = &il->bands[ch->band];
3436
3437                 geo_ch = &sband->channels[sband->n_channels++];
3438
3439                 geo_ch->center_freq =
3440                     ieee80211_channel_to_frequency(ch->channel, ch->band);
3441                 geo_ch->max_power = ch->max_power_avg;
3442                 geo_ch->max_antenna_gain = 0xff;
3443                 geo_ch->hw_value = ch->channel;
3444
3445                 if (il_is_channel_valid(ch)) {
3446                         if (!(ch->flags & EEPROM_CHANNEL_IBSS))
3447                                 geo_ch->flags |= IEEE80211_CHAN_NO_IR;
3448
3449                         if (!(ch->flags & EEPROM_CHANNEL_ACTIVE))
3450                                 geo_ch->flags |= IEEE80211_CHAN_NO_IR;
3451
3452                         if (ch->flags & EEPROM_CHANNEL_RADAR)
3453                                 geo_ch->flags |= IEEE80211_CHAN_RADAR;
3454
3455                         geo_ch->flags |= ch->ht40_extension_channel;
3456
3457                         if (ch->max_power_avg > max_tx_power)
3458                                 max_tx_power = ch->max_power_avg;
3459                 } else {
3460                         geo_ch->flags |= IEEE80211_CHAN_DISABLED;
3461                 }
3462
3463                 D_INFO("Channel %d Freq=%d[%sGHz] %s flag=0x%X\n", ch->channel,
3464                        geo_ch->center_freq,
3465                        il_is_channel_a_band(ch) ? "5.2" : "2.4",
3466                        geo_ch->
3467                        flags & IEEE80211_CHAN_DISABLED ? "restricted" : "valid",
3468                        geo_ch->flags);
3469         }
3470
3471         il->tx_power_device_lmt = max_tx_power;
3472         il->tx_power_user_lmt = max_tx_power;
3473         il->tx_power_next = max_tx_power;
3474
3475         if (il->bands[IEEE80211_BAND_5GHZ].n_channels == 0 &&
3476             (il->cfg->sku & IL_SKU_A)) {
3477                 IL_INFO("Incorrectly detected BG card as ABG. "
3478                         "Please send your PCI ID 0x%04X:0x%04X to maintainer.\n",
3479                         il->pci_dev->device, il->pci_dev->subsystem_device);
3480                 il->cfg->sku &= ~IL_SKU_A;
3481         }
3482
3483         IL_INFO("Tunable channels: %d 802.11bg, %d 802.11a channels\n",
3484                 il->bands[IEEE80211_BAND_2GHZ].n_channels,
3485                 il->bands[IEEE80211_BAND_5GHZ].n_channels);
3486
3487         set_bit(S_GEO_CONFIGURED, &il->status);
3488
3489         return 0;
3490 }
3491 EXPORT_SYMBOL(il_init_geos);
3492
3493 /*
3494  * il_free_geos - undo allocations in il_init_geos
3495  */
3496 void
3497 il_free_geos(struct il_priv *il)
3498 {
3499         kfree(il->ieee_channels);
3500         kfree(il->ieee_rates);
3501         clear_bit(S_GEO_CONFIGURED, &il->status);
3502 }
3503 EXPORT_SYMBOL(il_free_geos);
3504
3505 static bool
3506 il_is_channel_extension(struct il_priv *il, enum ieee80211_band band,
3507                         u16 channel, u8 extension_chan_offset)
3508 {
3509         const struct il_channel_info *ch_info;
3510
3511         ch_info = il_get_channel_info(il, band, channel);
3512         if (!il_is_channel_valid(ch_info))
3513                 return false;
3514
3515         if (extension_chan_offset == IEEE80211_HT_PARAM_CHA_SEC_ABOVE)
3516                 return !(ch_info->
3517                          ht40_extension_channel & IEEE80211_CHAN_NO_HT40PLUS);
3518         else if (extension_chan_offset == IEEE80211_HT_PARAM_CHA_SEC_BELOW)
3519                 return !(ch_info->
3520                          ht40_extension_channel & IEEE80211_CHAN_NO_HT40MINUS);
3521
3522         return false;
3523 }
3524
3525 bool
3526 il_is_ht40_tx_allowed(struct il_priv *il, struct ieee80211_sta_ht_cap *ht_cap)
3527 {
3528         if (!il->ht.enabled || !il->ht.is_40mhz)
3529                 return false;
3530
3531         /*
3532          * We do not check for IEEE80211_HT_CAP_SUP_WIDTH_20_40
3533          * the bit will not set if it is pure 40MHz case
3534          */
3535         if (ht_cap && !ht_cap->ht_supported)
3536                 return false;
3537
3538 #ifdef CONFIG_IWLEGACY_DEBUGFS
3539         if (il->disable_ht40)
3540                 return false;
3541 #endif
3542
3543         return il_is_channel_extension(il, il->band,
3544                                        le16_to_cpu(il->staging.channel),
3545                                        il->ht.extension_chan_offset);
3546 }
3547 EXPORT_SYMBOL(il_is_ht40_tx_allowed);
3548
3549 static u16
3550 il_adjust_beacon_interval(u16 beacon_val, u16 max_beacon_val)
3551 {
3552         u16 new_val;
3553         u16 beacon_factor;
3554
3555         /*
3556          * If mac80211 hasn't given us a beacon interval, program
3557          * the default into the device.
3558          */
3559         if (!beacon_val)
3560                 return DEFAULT_BEACON_INTERVAL;
3561
3562         /*
3563          * If the beacon interval we obtained from the peer
3564          * is too large, we'll have to wake up more often
3565          * (and in IBSS case, we'll beacon too much)
3566          *
3567          * For example, if max_beacon_val is 4096, and the
3568          * requested beacon interval is 7000, we'll have to
3569          * use 3500 to be able to wake up on the beacons.
3570          *
3571          * This could badly influence beacon detection stats.
3572          */
3573
3574         beacon_factor = (beacon_val + max_beacon_val) / max_beacon_val;
3575         new_val = beacon_val / beacon_factor;
3576
3577         if (!new_val)
3578                 new_val = max_beacon_val;
3579
3580         return new_val;
3581 }
3582
3583 int
3584 il_send_rxon_timing(struct il_priv *il)
3585 {
3586         u64 tsf;
3587         s32 interval_tm, rem;
3588         struct ieee80211_conf *conf = NULL;
3589         u16 beacon_int;
3590         struct ieee80211_vif *vif = il->vif;
3591
3592         conf = &il->hw->conf;
3593
3594         lockdep_assert_held(&il->mutex);
3595
3596         memset(&il->timing, 0, sizeof(struct il_rxon_time_cmd));
3597
3598         il->timing.timestamp = cpu_to_le64(il->timestamp);
3599         il->timing.listen_interval = cpu_to_le16(conf->listen_interval);
3600
3601         beacon_int = vif ? vif->bss_conf.beacon_int : 0;
3602
3603         /*
3604          * TODO: For IBSS we need to get atim_win from mac80211,
3605          *       for now just always use 0
3606          */
3607         il->timing.atim_win = 0;
3608
3609         beacon_int =
3610             il_adjust_beacon_interval(beacon_int,
3611                                       il->hw_params.max_beacon_itrvl *
3612                                       TIME_UNIT);
3613         il->timing.beacon_interval = cpu_to_le16(beacon_int);
3614
3615         tsf = il->timestamp;    /* tsf is modifed by do_div: copy it */
3616         interval_tm = beacon_int * TIME_UNIT;
3617         rem = do_div(tsf, interval_tm);
3618         il->timing.beacon_init_val = cpu_to_le32(interval_tm - rem);
3619
3620         il->timing.dtim_period = vif ? (vif->bss_conf.dtim_period ? : 1) : 1;
3621
3622         D_ASSOC("beacon interval %d beacon timer %d beacon tim %d\n",
3623                 le16_to_cpu(il->timing.beacon_interval),
3624                 le32_to_cpu(il->timing.beacon_init_val),
3625                 le16_to_cpu(il->timing.atim_win));
3626
3627         return il_send_cmd_pdu(il, C_RXON_TIMING, sizeof(il->timing),
3628                                &il->timing);
3629 }
3630 EXPORT_SYMBOL(il_send_rxon_timing);
3631
3632 void
3633 il_set_rxon_hwcrypto(struct il_priv *il, int hw_decrypt)
3634 {
3635         struct il_rxon_cmd *rxon = &il->staging;
3636
3637         if (hw_decrypt)
3638                 rxon->filter_flags &= ~RXON_FILTER_DIS_DECRYPT_MSK;
3639         else
3640                 rxon->filter_flags |= RXON_FILTER_DIS_DECRYPT_MSK;
3641
3642 }
3643 EXPORT_SYMBOL(il_set_rxon_hwcrypto);
3644
3645 /* validate RXON structure is valid */
3646 int
3647 il_check_rxon_cmd(struct il_priv *il)
3648 {
3649         struct il_rxon_cmd *rxon = &il->staging;
3650         bool error = false;
3651
3652         if (rxon->flags & RXON_FLG_BAND_24G_MSK) {
3653                 if (rxon->flags & RXON_FLG_TGJ_NARROW_BAND_MSK) {
3654                         IL_WARN("check 2.4G: wrong narrow\n");
3655                         error = true;
3656                 }
3657                 if (rxon->flags & RXON_FLG_RADAR_DETECT_MSK) {
3658                         IL_WARN("check 2.4G: wrong radar\n");
3659                         error = true;
3660                 }
3661         } else {
3662                 if (!(rxon->flags & RXON_FLG_SHORT_SLOT_MSK)) {
3663                         IL_WARN("check 5.2G: not short slot!\n");
3664                         error = true;
3665                 }
3666                 if (rxon->flags & RXON_FLG_CCK_MSK) {
3667                         IL_WARN("check 5.2G: CCK!\n");
3668                         error = true;
3669                 }
3670         }
3671         if ((rxon->node_addr[0] | rxon->bssid_addr[0]) & 0x1) {
3672                 IL_WARN("mac/bssid mcast!\n");
3673                 error = true;
3674         }
3675
3676         /* make sure basic rates 6Mbps and 1Mbps are supported */
3677         if ((rxon->ofdm_basic_rates & RATE_6M_MASK) == 0 &&
3678             (rxon->cck_basic_rates & RATE_1M_MASK) == 0) {
3679                 IL_WARN("neither 1 nor 6 are basic\n");
3680                 error = true;
3681         }
3682
3683         if (le16_to_cpu(rxon->assoc_id) > 2007) {
3684                 IL_WARN("aid > 2007\n");
3685                 error = true;
3686         }
3687
3688         if ((rxon->flags & (RXON_FLG_CCK_MSK | RXON_FLG_SHORT_SLOT_MSK)) ==
3689             (RXON_FLG_CCK_MSK | RXON_FLG_SHORT_SLOT_MSK)) {
3690                 IL_WARN("CCK and short slot\n");
3691                 error = true;
3692         }
3693
3694         if ((rxon->flags & (RXON_FLG_CCK_MSK | RXON_FLG_AUTO_DETECT_MSK)) ==
3695             (RXON_FLG_CCK_MSK | RXON_FLG_AUTO_DETECT_MSK)) {
3696                 IL_WARN("CCK and auto detect");
3697                 error = true;
3698         }
3699
3700         if ((rxon->
3701              flags & (RXON_FLG_AUTO_DETECT_MSK | RXON_FLG_TGG_PROTECT_MSK)) ==
3702             RXON_FLG_TGG_PROTECT_MSK) {
3703                 IL_WARN("TGg but no auto-detect\n");
3704                 error = true;
3705         }
3706
3707         if (error)
3708                 IL_WARN("Tuning to channel %d\n", le16_to_cpu(rxon->channel));
3709
3710         if (error) {
3711                 IL_ERR("Invalid RXON\n");
3712                 return -EINVAL;
3713         }
3714         return 0;
3715 }
3716 EXPORT_SYMBOL(il_check_rxon_cmd);
3717
3718 /**
3719  * il_full_rxon_required - check if full RXON (vs RXON_ASSOC) cmd is needed
3720  * @il: staging_rxon is compared to active_rxon
3721  *
3722  * If the RXON structure is changing enough to require a new tune,
3723  * or is clearing the RXON_FILTER_ASSOC_MSK, then return 1 to indicate that
3724  * a new tune (full RXON command, rather than RXON_ASSOC cmd) is required.
3725  */
3726 int
3727 il_full_rxon_required(struct il_priv *il)
3728 {
3729         const struct il_rxon_cmd *staging = &il->staging;
3730         const struct il_rxon_cmd *active = &il->active;
3731
3732 #define CHK(cond)                                                       \
3733         if ((cond)) {                                                   \
3734                 D_INFO("need full RXON - " #cond "\n"); \
3735                 return 1;                                               \
3736         }
3737
3738 #define CHK_NEQ(c1, c2)                                         \
3739         if ((c1) != (c2)) {                                     \
3740                 D_INFO("need full RXON - "      \
3741                                #c1 " != " #c2 " - %d != %d\n",  \
3742                                (c1), (c2));                     \
3743                 return 1;                                       \
3744         }
3745
3746         /* These items are only settable from the full RXON command */
3747         CHK(!il_is_associated(il));
3748         CHK(!ether_addr_equal_64bits(staging->bssid_addr, active->bssid_addr));
3749         CHK(!ether_addr_equal_64bits(staging->node_addr, active->node_addr));
3750         CHK(!ether_addr_equal_64bits(staging->wlap_bssid_addr,
3751                                      active->wlap_bssid_addr));
3752         CHK_NEQ(staging->dev_type, active->dev_type);
3753         CHK_NEQ(staging->channel, active->channel);
3754         CHK_NEQ(staging->air_propagation, active->air_propagation);
3755         CHK_NEQ(staging->ofdm_ht_single_stream_basic_rates,
3756                 active->ofdm_ht_single_stream_basic_rates);
3757         CHK_NEQ(staging->ofdm_ht_dual_stream_basic_rates,
3758                 active->ofdm_ht_dual_stream_basic_rates);
3759         CHK_NEQ(staging->assoc_id, active->assoc_id);
3760
3761         /* flags, filter_flags, ofdm_basic_rates, and cck_basic_rates can
3762          * be updated with the RXON_ASSOC command -- however only some
3763          * flag transitions are allowed using RXON_ASSOC */
3764
3765         /* Check if we are not switching bands */
3766         CHK_NEQ(staging->flags & RXON_FLG_BAND_24G_MSK,
3767                 active->flags & RXON_FLG_BAND_24G_MSK);
3768
3769         /* Check if we are switching association toggle */
3770         CHK_NEQ(staging->filter_flags & RXON_FILTER_ASSOC_MSK,
3771                 active->filter_flags & RXON_FILTER_ASSOC_MSK);
3772
3773 #undef CHK
3774 #undef CHK_NEQ
3775
3776         return 0;
3777 }
3778 EXPORT_SYMBOL(il_full_rxon_required);
3779
3780 u8
3781 il_get_lowest_plcp(struct il_priv *il)
3782 {
3783         /*
3784          * Assign the lowest rate -- should really get this from
3785          * the beacon skb from mac80211.
3786          */
3787         if (il->staging.flags & RXON_FLG_BAND_24G_MSK)
3788                 return RATE_1M_PLCP;
3789         else
3790                 return RATE_6M_PLCP;
3791 }
3792 EXPORT_SYMBOL(il_get_lowest_plcp);
3793
3794 static void
3795 _il_set_rxon_ht(struct il_priv *il, struct il_ht_config *ht_conf)
3796 {
3797         struct il_rxon_cmd *rxon = &il->staging;
3798
3799         if (!il->ht.enabled) {
3800                 rxon->flags &=
3801                     ~(RXON_FLG_CHANNEL_MODE_MSK |
3802                       RXON_FLG_CTRL_CHANNEL_LOC_HI_MSK | RXON_FLG_HT40_PROT_MSK
3803                       | RXON_FLG_HT_PROT_MSK);
3804                 return;
3805         }
3806
3807         rxon->flags |=
3808             cpu_to_le32(il->ht.protection << RXON_FLG_HT_OPERATING_MODE_POS);
3809
3810         /* Set up channel bandwidth:
3811          * 20 MHz only, 20/40 mixed or pure 40 if ht40 ok */
3812         /* clear the HT channel mode before set the mode */
3813         rxon->flags &=
3814             ~(RXON_FLG_CHANNEL_MODE_MSK | RXON_FLG_CTRL_CHANNEL_LOC_HI_MSK);
3815         if (il_is_ht40_tx_allowed(il, NULL)) {
3816                 /* pure ht40 */
3817                 if (il->ht.protection == IEEE80211_HT_OP_MODE_PROTECTION_20MHZ) {
3818                         rxon->flags |= RXON_FLG_CHANNEL_MODE_PURE_40;
3819                         /* Note: control channel is opposite of extension channel */
3820                         switch (il->ht.extension_chan_offset) {
3821                         case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
3822                                 rxon->flags &=
3823                                     ~RXON_FLG_CTRL_CHANNEL_LOC_HI_MSK;
3824                                 break;
3825                         case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
3826                                 rxon->flags |= RXON_FLG_CTRL_CHANNEL_LOC_HI_MSK;
3827                                 break;
3828                         }
3829                 } else {
3830                         /* Note: control channel is opposite of extension channel */
3831                         switch (il->ht.extension_chan_offset) {
3832                         case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
3833                                 rxon->flags &=
3834                                     ~(RXON_FLG_CTRL_CHANNEL_LOC_HI_MSK);
3835                                 rxon->flags |= RXON_FLG_CHANNEL_MODE_MIXED;
3836                                 break;
3837                         case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
3838                                 rxon->flags |= RXON_FLG_CTRL_CHANNEL_LOC_HI_MSK;
3839                                 rxon->flags |= RXON_FLG_CHANNEL_MODE_MIXED;
3840                                 break;
3841                         case IEEE80211_HT_PARAM_CHA_SEC_NONE:
3842                         default:
3843                                 /* channel location only valid if in Mixed mode */
3844                                 IL_ERR("invalid extension channel offset\n");
3845                                 break;
3846                         }
3847                 }
3848         } else {
3849                 rxon->flags |= RXON_FLG_CHANNEL_MODE_LEGACY;
3850         }
3851
3852         if (il->ops->set_rxon_chain)
3853                 il->ops->set_rxon_chain(il);
3854
3855         D_ASSOC("rxon flags 0x%X operation mode :0x%X "
3856                 "extension channel offset 0x%x\n", le32_to_cpu(rxon->flags),
3857                 il->ht.protection, il->ht.extension_chan_offset);
3858 }
3859
3860 void
3861 il_set_rxon_ht(struct il_priv *il, struct il_ht_config *ht_conf)
3862 {
3863         _il_set_rxon_ht(il, ht_conf);
3864 }
3865 EXPORT_SYMBOL(il_set_rxon_ht);
3866
3867 /* Return valid, unused, channel for a passive scan to reset the RF */
3868 u8
3869 il_get_single_channel_number(struct il_priv *il, enum ieee80211_band band)
3870 {
3871         const struct il_channel_info *ch_info;
3872         int i;
3873         u8 channel = 0;
3874         u8 min, max;
3875
3876         if (band == IEEE80211_BAND_5GHZ) {
3877                 min = 14;
3878                 max = il->channel_count;
3879         } else {
3880                 min = 0;
3881                 max = 14;
3882         }
3883
3884         for (i = min; i < max; i++) {
3885                 channel = il->channel_info[i].channel;
3886                 if (channel == le16_to_cpu(il->staging.channel))
3887                         continue;
3888
3889                 ch_info = il_get_channel_info(il, band, channel);
3890                 if (il_is_channel_valid(ch_info))
3891                         break;
3892         }
3893
3894         return channel;
3895 }
3896 EXPORT_SYMBOL(il_get_single_channel_number);
3897
3898 /**
3899  * il_set_rxon_channel - Set the band and channel values in staging RXON
3900  * @ch: requested channel as a pointer to struct ieee80211_channel
3901
3902  * NOTE:  Does not commit to the hardware; it sets appropriate bit fields
3903  * in the staging RXON flag structure based on the ch->band
3904  */
3905 int
3906 il_set_rxon_channel(struct il_priv *il, struct ieee80211_channel *ch)
3907 {
3908         enum ieee80211_band band = ch->band;
3909         u16 channel = ch->hw_value;
3910
3911         if (le16_to_cpu(il->staging.channel) == channel && il->band == band)
3912                 return 0;
3913
3914         il->staging.channel = cpu_to_le16(channel);
3915         if (band == IEEE80211_BAND_5GHZ)
3916                 il->staging.flags &= ~RXON_FLG_BAND_24G_MSK;
3917         else
3918                 il->staging.flags |= RXON_FLG_BAND_24G_MSK;
3919
3920         il->band = band;
3921
3922         D_INFO("Staging channel set to %d [%d]\n", channel, band);
3923
3924         return 0;
3925 }
3926 EXPORT_SYMBOL(il_set_rxon_channel);
3927
3928 void
3929 il_set_flags_for_band(struct il_priv *il, enum ieee80211_band band,
3930                       struct ieee80211_vif *vif)
3931 {
3932         if (band == IEEE80211_BAND_5GHZ) {
3933                 il->staging.flags &=
3934                     ~(RXON_FLG_BAND_24G_MSK | RXON_FLG_AUTO_DETECT_MSK |
3935                       RXON_FLG_CCK_MSK);
3936                 il->staging.flags |= RXON_FLG_SHORT_SLOT_MSK;
3937         } else {
3938                 /* Copied from il_post_associate() */
3939                 if (vif && vif->bss_conf.use_short_slot)
3940                         il->staging.flags |= RXON_FLG_SHORT_SLOT_MSK;
3941                 else
3942                         il->staging.flags &= ~RXON_FLG_SHORT_SLOT_MSK;
3943
3944                 il->staging.flags |= RXON_FLG_BAND_24G_MSK;
3945                 il->staging.flags |= RXON_FLG_AUTO_DETECT_MSK;
3946                 il->staging.flags &= ~RXON_FLG_CCK_MSK;
3947         }
3948 }
3949 EXPORT_SYMBOL(il_set_flags_for_band);
3950
3951 /*
3952  * initialize rxon structure with default values from eeprom
3953  */
3954 void
3955 il_connection_init_rx_config(struct il_priv *il)
3956 {
3957         const struct il_channel_info *ch_info;
3958
3959         memset(&il->staging, 0, sizeof(il->staging));
3960
3961         switch (il->iw_mode) {
3962         case NL80211_IFTYPE_UNSPECIFIED:
3963                 il->staging.dev_type = RXON_DEV_TYPE_ESS;
3964                 break;
3965         case NL80211_IFTYPE_STATION:
3966                 il->staging.dev_type = RXON_DEV_TYPE_ESS;
3967                 il->staging.filter_flags = RXON_FILTER_ACCEPT_GRP_MSK;
3968                 break;
3969         case NL80211_IFTYPE_ADHOC:
3970                 il->staging.dev_type = RXON_DEV_TYPE_IBSS;
3971                 il->staging.flags = RXON_FLG_SHORT_PREAMBLE_MSK;
3972                 il->staging.filter_flags =
3973                     RXON_FILTER_BCON_AWARE_MSK | RXON_FILTER_ACCEPT_GRP_MSK;
3974                 break;
3975         default:
3976                 IL_ERR("Unsupported interface type %d\n", il->vif->type);
3977                 return;
3978         }
3979
3980 #if 0
3981         /* TODO:  Figure out when short_preamble would be set and cache from
3982          * that */
3983         if (!hw_to_local(il->hw)->short_preamble)
3984                 il->staging.flags &= ~RXON_FLG_SHORT_PREAMBLE_MSK;
3985         else
3986                 il->staging.flags |= RXON_FLG_SHORT_PREAMBLE_MSK;
3987 #endif
3988
3989         ch_info =
3990             il_get_channel_info(il, il->band, le16_to_cpu(il->active.channel));
3991
3992         if (!ch_info)
3993                 ch_info = &il->channel_info[0];
3994
3995         il->staging.channel = cpu_to_le16(ch_info->channel);
3996         il->band = ch_info->band;
3997
3998         il_set_flags_for_band(il, il->band, il->vif);
3999
4000         il->staging.ofdm_basic_rates =
4001             (IL_OFDM_RATES_MASK >> IL_FIRST_OFDM_RATE) & 0xFF;
4002         il->staging.cck_basic_rates =
4003             (IL_CCK_RATES_MASK >> IL_FIRST_CCK_RATE) & 0xF;
4004
4005         /* clear both MIX and PURE40 mode flag */
4006         il->staging.flags &=
4007             ~(RXON_FLG_CHANNEL_MODE_MIXED | RXON_FLG_CHANNEL_MODE_PURE_40);
4008         if (il->vif)
4009                 memcpy(il->staging.node_addr, il->vif->addr, ETH_ALEN);
4010
4011         il->staging.ofdm_ht_single_stream_basic_rates = 0xff;
4012         il->staging.ofdm_ht_dual_stream_basic_rates = 0xff;
4013 }
4014 EXPORT_SYMBOL(il_connection_init_rx_config);
4015
4016 void
4017 il_set_rate(struct il_priv *il)
4018 {
4019         const struct ieee80211_supported_band *hw = NULL;
4020         struct ieee80211_rate *rate;
4021         int i;
4022
4023         hw = il_get_hw_mode(il, il->band);
4024         if (!hw) {
4025                 IL_ERR("Failed to set rate: unable to get hw mode\n");
4026                 return;
4027         }
4028
4029         il->active_rate = 0;
4030
4031         for (i = 0; i < hw->n_bitrates; i++) {
4032                 rate = &(hw->bitrates[i]);
4033                 if (rate->hw_value < RATE_COUNT_LEGACY)
4034                         il->active_rate |= (1 << rate->hw_value);
4035         }
4036
4037         D_RATE("Set active_rate = %0x\n", il->active_rate);
4038
4039         il->staging.cck_basic_rates =
4040             (IL_CCK_BASIC_RATES_MASK >> IL_FIRST_CCK_RATE) & 0xF;
4041
4042         il->staging.ofdm_basic_rates =
4043             (IL_OFDM_BASIC_RATES_MASK >> IL_FIRST_OFDM_RATE) & 0xFF;
4044 }
4045 EXPORT_SYMBOL(il_set_rate);
4046
4047 void
4048 il_chswitch_done(struct il_priv *il, bool is_success)
4049 {
4050         if (test_bit(S_EXIT_PENDING, &il->status))
4051                 return;
4052
4053         if (test_and_clear_bit(S_CHANNEL_SWITCH_PENDING, &il->status))
4054                 ieee80211_chswitch_done(il->vif, is_success);
4055 }
4056 EXPORT_SYMBOL(il_chswitch_done);
4057
4058 void
4059 il_hdl_csa(struct il_priv *il, struct il_rx_buf *rxb)
4060 {
4061         struct il_rx_pkt *pkt = rxb_addr(rxb);
4062         struct il_csa_notification *csa = &(pkt->u.csa_notif);
4063         struct il_rxon_cmd *rxon = (void *)&il->active;
4064
4065         if (!test_bit(S_CHANNEL_SWITCH_PENDING, &il->status))
4066                 return;
4067
4068         if (!le32_to_cpu(csa->status) && csa->channel == il->switch_channel) {
4069                 rxon->channel = csa->channel;
4070                 il->staging.channel = csa->channel;
4071                 D_11H("CSA notif: channel %d\n", le16_to_cpu(csa->channel));
4072                 il_chswitch_done(il, true);
4073         } else {
4074                 IL_ERR("CSA notif (fail) : channel %d\n",
4075                        le16_to_cpu(csa->channel));
4076                 il_chswitch_done(il, false);
4077         }
4078 }
4079 EXPORT_SYMBOL(il_hdl_csa);
4080
4081 #ifdef CONFIG_IWLEGACY_DEBUG
4082 void
4083 il_print_rx_config_cmd(struct il_priv *il)
4084 {
4085         struct il_rxon_cmd *rxon = &il->staging;
4086
4087         D_RADIO("RX CONFIG:\n");
4088         il_print_hex_dump(il, IL_DL_RADIO, (u8 *) rxon, sizeof(*rxon));
4089         D_RADIO("u16 channel: 0x%x\n", le16_to_cpu(rxon->channel));
4090         D_RADIO("u32 flags: 0x%08X\n", le32_to_cpu(rxon->flags));
4091         D_RADIO("u32 filter_flags: 0x%08x\n", le32_to_cpu(rxon->filter_flags));
4092         D_RADIO("u8 dev_type: 0x%x\n", rxon->dev_type);
4093         D_RADIO("u8 ofdm_basic_rates: 0x%02x\n", rxon->ofdm_basic_rates);
4094         D_RADIO("u8 cck_basic_rates: 0x%02x\n", rxon->cck_basic_rates);
4095         D_RADIO("u8[6] node_addr: %pM\n", rxon->node_addr);
4096         D_RADIO("u8[6] bssid_addr: %pM\n", rxon->bssid_addr);
4097         D_RADIO("u16 assoc_id: 0x%x\n", le16_to_cpu(rxon->assoc_id));
4098 }
4099 EXPORT_SYMBOL(il_print_rx_config_cmd);
4100 #endif
4101 /**
4102  * il_irq_handle_error - called for HW or SW error interrupt from card
4103  */
4104 void
4105 il_irq_handle_error(struct il_priv *il)
4106 {
4107         /* Set the FW error flag -- cleared on il_down */
4108         set_bit(S_FW_ERROR, &il->status);
4109
4110         /* Cancel currently queued command. */
4111         clear_bit(S_HCMD_ACTIVE, &il->status);
4112
4113         IL_ERR("Loaded firmware version: %s\n", il->hw->wiphy->fw_version);
4114
4115         il->ops->dump_nic_error_log(il);
4116         if (il->ops->dump_fh)
4117                 il->ops->dump_fh(il, NULL, false);
4118 #ifdef CONFIG_IWLEGACY_DEBUG
4119         if (il_get_debug_level(il) & IL_DL_FW_ERRORS)
4120                 il_print_rx_config_cmd(il);
4121 #endif
4122
4123         wake_up(&il->wait_command_queue);
4124
4125         /* Keep the restart process from trying to send host
4126          * commands by clearing the INIT status bit */
4127         clear_bit(S_READY, &il->status);
4128
4129         if (!test_bit(S_EXIT_PENDING, &il->status)) {
4130                 IL_DBG(IL_DL_FW_ERRORS,
4131                        "Restarting adapter due to uCode error.\n");
4132
4133                 if (il->cfg->mod_params->restart_fw)
4134                         queue_work(il->workqueue, &il->restart);
4135         }
4136 }
4137 EXPORT_SYMBOL(il_irq_handle_error);
4138
4139 static int
4140 _il_apm_stop_master(struct il_priv *il)
4141 {
4142         int ret = 0;
4143
4144         /* stop device's busmaster DMA activity */
4145         _il_set_bit(il, CSR_RESET, CSR_RESET_REG_FLAG_STOP_MASTER);
4146
4147         ret =
4148             _il_poll_bit(il, CSR_RESET, CSR_RESET_REG_FLAG_MASTER_DISABLED,
4149                          CSR_RESET_REG_FLAG_MASTER_DISABLED, 100);
4150         if (ret < 0)
4151                 IL_WARN("Master Disable Timed Out, 100 usec\n");
4152
4153         D_INFO("stop master\n");
4154
4155         return ret;
4156 }
4157
4158 void
4159 _il_apm_stop(struct il_priv *il)
4160 {
4161         lockdep_assert_held(&il->reg_lock);
4162
4163         D_INFO("Stop card, put in low power state\n");
4164
4165         /* Stop device's DMA activity */
4166         _il_apm_stop_master(il);
4167
4168         /* Reset the entire device */
4169         _il_set_bit(il, CSR_RESET, CSR_RESET_REG_FLAG_SW_RESET);
4170
4171         udelay(10);
4172
4173         /*
4174          * Clear "initialization complete" bit to move adapter from
4175          * D0A* (powered-up Active) --> D0U* (Uninitialized) state.
4176          */
4177         _il_clear_bit(il, CSR_GP_CNTRL, CSR_GP_CNTRL_REG_FLAG_INIT_DONE);
4178 }
4179 EXPORT_SYMBOL(_il_apm_stop);
4180
4181 void
4182 il_apm_stop(struct il_priv *il)
4183 {
4184         unsigned long flags;
4185
4186         spin_lock_irqsave(&il->reg_lock, flags);
4187         _il_apm_stop(il);
4188         spin_unlock_irqrestore(&il->reg_lock, flags);
4189 }
4190 EXPORT_SYMBOL(il_apm_stop);
4191
4192 /*
4193  * Start up NIC's basic functionality after it has been reset
4194  * (e.g. after platform boot, or shutdown via il_apm_stop())
4195  * NOTE:  This does not load uCode nor start the embedded processor
4196  */
4197 int
4198 il_apm_init(struct il_priv *il)
4199 {
4200         int ret = 0;
4201         u16 lctl;
4202
4203         D_INFO("Init card's basic functions\n");
4204
4205         /*
4206          * Use "set_bit" below rather than "write", to preserve any hardware
4207          * bits already set by default after reset.
4208          */
4209
4210         /* Disable L0S exit timer (platform NMI Work/Around) */
4211         il_set_bit(il, CSR_GIO_CHICKEN_BITS,
4212                    CSR_GIO_CHICKEN_BITS_REG_BIT_DIS_L0S_EXIT_TIMER);
4213
4214         /*
4215          * Disable L0s without affecting L1;
4216          *  don't wait for ICH L0s (ICH bug W/A)
4217          */
4218         il_set_bit(il, CSR_GIO_CHICKEN_BITS,
4219                    CSR_GIO_CHICKEN_BITS_REG_BIT_L1A_NO_L0S_RX);
4220
4221         /* Set FH wait threshold to maximum (HW error during stress W/A) */
4222         il_set_bit(il, CSR_DBG_HPET_MEM_REG, CSR_DBG_HPET_MEM_REG_VAL);
4223
4224         /*
4225          * Enable HAP INTA (interrupt from management bus) to
4226          * wake device's PCI Express link L1a -> L0s
4227          * NOTE:  This is no-op for 3945 (non-existent bit)
4228          */
4229         il_set_bit(il, CSR_HW_IF_CONFIG_REG,
4230                    CSR_HW_IF_CONFIG_REG_BIT_HAP_WAKE_L1A);
4231
4232         /*
4233          * HW bug W/A for instability in PCIe bus L0->L0S->L1 transition.
4234          * Check if BIOS (or OS) enabled L1-ASPM on this device.
4235          * If so (likely), disable L0S, so device moves directly L0->L1;
4236          *    costs negligible amount of power savings.
4237          * If not (unlikely), enable L0S, so there is at least some
4238          *    power savings, even without L1.
4239          */
4240         if (il->cfg->set_l0s) {
4241                 pcie_capability_read_word(il->pci_dev, PCI_EXP_LNKCTL, &lctl);
4242                 if (lctl & PCI_EXP_LNKCTL_ASPM_L1) {
4243                         /* L1-ASPM enabled; disable(!) L0S  */
4244                         il_set_bit(il, CSR_GIO_REG,
4245                                    CSR_GIO_REG_VAL_L0S_ENABLED);
4246                         D_POWER("L1 Enabled; Disabling L0S\n");
4247                 } else {
4248                         /* L1-ASPM disabled; enable(!) L0S */
4249                         il_clear_bit(il, CSR_GIO_REG,
4250                                      CSR_GIO_REG_VAL_L0S_ENABLED);
4251                         D_POWER("L1 Disabled; Enabling L0S\n");
4252                 }
4253         }
4254
4255         /* Configure analog phase-lock-loop before activating to D0A */
4256         if (il->cfg->pll_cfg_val)
4257                 il_set_bit(il, CSR_ANA_PLL_CFG,
4258                            il->cfg->pll_cfg_val);
4259
4260         /*
4261          * Set "initialization complete" bit to move adapter from
4262          * D0U* --> D0A* (powered-up active) state.
4263          */
4264         il_set_bit(il, CSR_GP_CNTRL, CSR_GP_CNTRL_REG_FLAG_INIT_DONE);
4265
4266         /*
4267          * Wait for clock stabilization; once stabilized, access to
4268          * device-internal resources is supported, e.g. il_wr_prph()
4269          * and accesses to uCode SRAM.
4270          */
4271         ret =
4272             _il_poll_bit(il, CSR_GP_CNTRL,
4273                          CSR_GP_CNTRL_REG_FLAG_MAC_CLOCK_READY,
4274                          CSR_GP_CNTRL_REG_FLAG_MAC_CLOCK_READY, 25000);
4275         if (ret < 0) {
4276                 D_INFO("Failed to init the card\n");
4277                 goto out;
4278         }
4279
4280         /*
4281          * Enable DMA and BSM (if used) clocks, wait for them to stabilize.
4282          * BSM (Boostrap State Machine) is only in 3945 and 4965.
4283          *
4284          * Write to "CLK_EN_REG"; "1" bits enable clocks, while "0" bits
4285          * do not disable clocks.  This preserves any hardware bits already
4286          * set by default in "CLK_CTRL_REG" after reset.
4287          */
4288         if (il->cfg->use_bsm)
4289                 il_wr_prph(il, APMG_CLK_EN_REG,
4290                            APMG_CLK_VAL_DMA_CLK_RQT | APMG_CLK_VAL_BSM_CLK_RQT);
4291         else
4292                 il_wr_prph(il, APMG_CLK_EN_REG, APMG_CLK_VAL_DMA_CLK_RQT);
4293         udelay(20);
4294
4295         /* Disable L1-Active */
4296         il_set_bits_prph(il, APMG_PCIDEV_STT_REG,
4297                          APMG_PCIDEV_STT_VAL_L1_ACT_DIS);
4298
4299 out:
4300         return ret;
4301 }
4302 EXPORT_SYMBOL(il_apm_init);
4303
4304 int
4305 il_set_tx_power(struct il_priv *il, s8 tx_power, bool force)
4306 {
4307         int ret;
4308         s8 prev_tx_power;
4309         bool defer;
4310
4311         lockdep_assert_held(&il->mutex);
4312
4313         if (il->tx_power_user_lmt == tx_power && !force)
4314                 return 0;
4315
4316         if (!il->ops->send_tx_power)
4317                 return -EOPNOTSUPP;
4318
4319         /* 0 dBm mean 1 milliwatt */
4320         if (tx_power < 0) {
4321                 IL_WARN("Requested user TXPOWER %d below 1 mW.\n", tx_power);
4322                 return -EINVAL;
4323         }
4324
4325         if (tx_power > il->tx_power_device_lmt) {
4326                 IL_WARN("Requested user TXPOWER %d above upper limit %d.\n",
4327                         tx_power, il->tx_power_device_lmt);
4328                 return -EINVAL;
4329         }
4330
4331         if (!il_is_ready_rf(il))
4332                 return -EIO;
4333
4334         /* scan complete and commit_rxon use tx_power_next value,
4335          * it always need to be updated for newest request */
4336         il->tx_power_next = tx_power;
4337
4338         /* do not set tx power when scanning or channel changing */
4339         defer = test_bit(S_SCANNING, &il->status) ||
4340             memcmp(&il->active, &il->staging, sizeof(il->staging));
4341         if (defer && !force) {
4342                 D_INFO("Deferring tx power set\n");
4343                 return 0;
4344         }
4345
4346         prev_tx_power = il->tx_power_user_lmt;
4347         il->tx_power_user_lmt = tx_power;
4348
4349         ret = il->ops->send_tx_power(il);
4350
4351         /* if fail to set tx_power, restore the orig. tx power */
4352         if (ret) {
4353                 il->tx_power_user_lmt = prev_tx_power;
4354                 il->tx_power_next = prev_tx_power;
4355         }
4356         return ret;
4357 }
4358 EXPORT_SYMBOL(il_set_tx_power);
4359
4360 void
4361 il_send_bt_config(struct il_priv *il)
4362 {
4363         struct il_bt_cmd bt_cmd = {
4364                 .lead_time = BT_LEAD_TIME_DEF,
4365                 .max_kill = BT_MAX_KILL_DEF,
4366                 .kill_ack_mask = 0,
4367                 .kill_cts_mask = 0,
4368         };
4369
4370         if (!bt_coex_active)
4371                 bt_cmd.flags = BT_COEX_DISABLE;
4372         else
4373                 bt_cmd.flags = BT_COEX_ENABLE;
4374
4375         D_INFO("BT coex %s\n",
4376                (bt_cmd.flags == BT_COEX_DISABLE) ? "disable" : "active");
4377
4378         if (il_send_cmd_pdu(il, C_BT_CONFIG, sizeof(struct il_bt_cmd), &bt_cmd))
4379                 IL_ERR("failed to send BT Coex Config\n");
4380 }
4381 EXPORT_SYMBOL(il_send_bt_config);
4382
4383 int
4384 il_send_stats_request(struct il_priv *il, u8 flags, bool clear)
4385 {
4386         struct il_stats_cmd stats_cmd = {
4387                 .configuration_flags = clear ? IL_STATS_CONF_CLEAR_STATS : 0,
4388         };
4389
4390         if (flags & CMD_ASYNC)
4391                 return il_send_cmd_pdu_async(il, C_STATS, sizeof(struct il_stats_cmd),
4392                                              &stats_cmd, NULL);
4393         else
4394                 return il_send_cmd_pdu(il, C_STATS, sizeof(struct il_stats_cmd),
4395                                        &stats_cmd);
4396 }
4397 EXPORT_SYMBOL(il_send_stats_request);
4398
4399 void
4400 il_hdl_pm_sleep(struct il_priv *il, struct il_rx_buf *rxb)
4401 {
4402 #ifdef CONFIG_IWLEGACY_DEBUG
4403         struct il_rx_pkt *pkt = rxb_addr(rxb);
4404         struct il_sleep_notification *sleep = &(pkt->u.sleep_notif);
4405         D_RX("sleep mode: %d, src: %d\n",
4406              sleep->pm_sleep_mode, sleep->pm_wakeup_src);
4407 #endif
4408 }
4409 EXPORT_SYMBOL(il_hdl_pm_sleep);
4410
4411 void
4412 il_hdl_pm_debug_stats(struct il_priv *il, struct il_rx_buf *rxb)
4413 {
4414         struct il_rx_pkt *pkt = rxb_addr(rxb);
4415         u32 len = le32_to_cpu(pkt->len_n_flags) & IL_RX_FRAME_SIZE_MSK;
4416         D_RADIO("Dumping %d bytes of unhandled notification for %s:\n", len,
4417                 il_get_cmd_string(pkt->hdr.cmd));
4418         il_print_hex_dump(il, IL_DL_RADIO, pkt->u.raw, len);
4419 }
4420 EXPORT_SYMBOL(il_hdl_pm_debug_stats);
4421
4422 void
4423 il_hdl_error(struct il_priv *il, struct il_rx_buf *rxb)
4424 {
4425         struct il_rx_pkt *pkt = rxb_addr(rxb);
4426
4427         IL_ERR("Error Reply type 0x%08X cmd %s (0x%02X) "
4428                "seq 0x%04X ser 0x%08X\n",
4429                le32_to_cpu(pkt->u.err_resp.error_type),
4430                il_get_cmd_string(pkt->u.err_resp.cmd_id),
4431                pkt->u.err_resp.cmd_id,
4432                le16_to_cpu(pkt->u.err_resp.bad_cmd_seq_num),
4433                le32_to_cpu(pkt->u.err_resp.error_info));
4434 }
4435 EXPORT_SYMBOL(il_hdl_error);
4436
4437 void
4438 il_clear_isr_stats(struct il_priv *il)
4439 {
4440         memset(&il->isr_stats, 0, sizeof(il->isr_stats));
4441 }
4442
4443 int
4444 il_mac_conf_tx(struct ieee80211_hw *hw, struct ieee80211_vif *vif, u16 queue,
4445                const struct ieee80211_tx_queue_params *params)
4446 {
4447         struct il_priv *il = hw->priv;
4448         unsigned long flags;
4449         int q;
4450
4451         D_MAC80211("enter\n");
4452
4453         if (!il_is_ready_rf(il)) {
4454                 D_MAC80211("leave - RF not ready\n");
4455                 return -EIO;
4456         }
4457
4458         if (queue >= AC_NUM) {
4459                 D_MAC80211("leave - queue >= AC_NUM %d\n", queue);
4460                 return 0;
4461         }
4462
4463         q = AC_NUM - 1 - queue;
4464
4465         spin_lock_irqsave(&il->lock, flags);
4466
4467         il->qos_data.def_qos_parm.ac[q].cw_min =
4468             cpu_to_le16(params->cw_min);
4469         il->qos_data.def_qos_parm.ac[q].cw_max =
4470             cpu_to_le16(params->cw_max);
4471         il->qos_data.def_qos_parm.ac[q].aifsn = params->aifs;
4472         il->qos_data.def_qos_parm.ac[q].edca_txop =
4473             cpu_to_le16((params->txop * 32));
4474
4475         il->qos_data.def_qos_parm.ac[q].reserved1 = 0;
4476
4477         spin_unlock_irqrestore(&il->lock, flags);
4478
4479         D_MAC80211("leave\n");
4480         return 0;
4481 }
4482 EXPORT_SYMBOL(il_mac_conf_tx);
4483
4484 int
4485 il_mac_tx_last_beacon(struct ieee80211_hw *hw)
4486 {
4487         struct il_priv *il = hw->priv;
4488         int ret;
4489
4490         D_MAC80211("enter\n");
4491
4492         ret = (il->ibss_manager == IL_IBSS_MANAGER);
4493
4494         D_MAC80211("leave ret %d\n", ret);
4495         return ret;
4496 }
4497 EXPORT_SYMBOL_GPL(il_mac_tx_last_beacon);
4498
4499 static int
4500 il_set_mode(struct il_priv *il)
4501 {
4502         il_connection_init_rx_config(il);
4503
4504         if (il->ops->set_rxon_chain)
4505                 il->ops->set_rxon_chain(il);
4506
4507         return il_commit_rxon(il);
4508 }
4509
4510 int
4511 il_mac_add_interface(struct ieee80211_hw *hw, struct ieee80211_vif *vif)
4512 {
4513         struct il_priv *il = hw->priv;
4514         int err;
4515         bool reset;
4516
4517         mutex_lock(&il->mutex);
4518         D_MAC80211("enter: type %d, addr %pM\n", vif->type, vif->addr);
4519
4520         if (!il_is_ready_rf(il)) {
4521                 IL_WARN("Try to add interface when device not ready\n");
4522                 err = -EINVAL;
4523                 goto out;
4524         }
4525
4526         /*
4527          * We do not support multiple virtual interfaces, but on hardware reset
4528          * we have to add the same interface again.
4529          */
4530         reset = (il->vif == vif);
4531         if (il->vif && !reset) {
4532                 err = -EOPNOTSUPP;
4533                 goto out;
4534         }
4535
4536         il->vif = vif;
4537         il->iw_mode = vif->type;
4538
4539         err = il_set_mode(il);
4540         if (err) {
4541                 IL_WARN("Fail to set mode %d\n", vif->type);
4542                 if (!reset) {
4543                         il->vif = NULL;
4544                         il->iw_mode = NL80211_IFTYPE_STATION;
4545                 }
4546         }
4547
4548 out:
4549         D_MAC80211("leave err %d\n", err);
4550         mutex_unlock(&il->mutex);
4551
4552         return err;
4553 }
4554 EXPORT_SYMBOL(il_mac_add_interface);
4555
4556 static void
4557 il_teardown_interface(struct il_priv *il, struct ieee80211_vif *vif)
4558 {
4559         lockdep_assert_held(&il->mutex);
4560
4561         if (il->scan_vif == vif) {
4562                 il_scan_cancel_timeout(il, 200);
4563                 il_force_scan_end(il);
4564         }
4565
4566         il_set_mode(il);
4567 }
4568
4569 void
4570 il_mac_remove_interface(struct ieee80211_hw *hw, struct ieee80211_vif *vif)
4571 {
4572         struct il_priv *il = hw->priv;
4573
4574         mutex_lock(&il->mutex);
4575         D_MAC80211("enter: type %d, addr %pM\n", vif->type, vif->addr);
4576
4577         WARN_ON(il->vif != vif);
4578         il->vif = NULL;
4579         il->iw_mode = NL80211_IFTYPE_UNSPECIFIED;
4580         il_teardown_interface(il, vif);
4581         memset(il->bssid, 0, ETH_ALEN);
4582
4583         D_MAC80211("leave\n");
4584         mutex_unlock(&il->mutex);
4585 }
4586 EXPORT_SYMBOL(il_mac_remove_interface);
4587
4588 int
4589 il_alloc_txq_mem(struct il_priv *il)
4590 {
4591         if (!il->txq)
4592                 il->txq =
4593                     kzalloc(sizeof(struct il_tx_queue) *
4594                             il->cfg->num_of_queues, GFP_KERNEL);
4595         if (!il->txq) {
4596                 IL_ERR("Not enough memory for txq\n");
4597                 return -ENOMEM;
4598         }
4599         return 0;
4600 }
4601 EXPORT_SYMBOL(il_alloc_txq_mem);
4602
4603 void
4604 il_free_txq_mem(struct il_priv *il)
4605 {
4606         kfree(il->txq);
4607         il->txq = NULL;
4608 }
4609 EXPORT_SYMBOL(il_free_txq_mem);
4610
4611 int
4612 il_force_reset(struct il_priv *il, bool external)
4613 {
4614         struct il_force_reset *force_reset;
4615
4616         if (test_bit(S_EXIT_PENDING, &il->status))
4617                 return -EINVAL;
4618
4619         force_reset = &il->force_reset;
4620         force_reset->reset_request_count++;
4621         if (!external) {
4622                 if (force_reset->last_force_reset_jiffies &&
4623                     time_after(force_reset->last_force_reset_jiffies +
4624                                force_reset->reset_duration, jiffies)) {
4625                         D_INFO("force reset rejected\n");
4626                         force_reset->reset_reject_count++;
4627                         return -EAGAIN;
4628                 }
4629         }
4630         force_reset->reset_success_count++;
4631         force_reset->last_force_reset_jiffies = jiffies;
4632
4633         /*
4634          * if the request is from external(ex: debugfs),
4635          * then always perform the request in regardless the module
4636          * parameter setting
4637          * if the request is from internal (uCode error or driver
4638          * detect failure), then fw_restart module parameter
4639          * need to be check before performing firmware reload
4640          */
4641
4642         if (!external && !il->cfg->mod_params->restart_fw) {
4643                 D_INFO("Cancel firmware reload based on "
4644                        "module parameter setting\n");
4645                 return 0;
4646         }
4647
4648         IL_ERR("On demand firmware reload\n");
4649
4650         /* Set the FW error flag -- cleared on il_down */
4651         set_bit(S_FW_ERROR, &il->status);
4652         wake_up(&il->wait_command_queue);
4653         /*
4654          * Keep the restart process from trying to send host
4655          * commands by clearing the INIT status bit
4656          */
4657         clear_bit(S_READY, &il->status);
4658         queue_work(il->workqueue, &il->restart);
4659
4660         return 0;
4661 }
4662 EXPORT_SYMBOL(il_force_reset);
4663
4664 int
4665 il_mac_change_interface(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
4666                         enum nl80211_iftype newtype, bool newp2p)
4667 {
4668         struct il_priv *il = hw->priv;
4669         int err;
4670
4671         mutex_lock(&il->mutex);
4672         D_MAC80211("enter: type %d, addr %pM newtype %d newp2p %d\n",
4673                     vif->type, vif->addr, newtype, newp2p);
4674
4675         if (newp2p) {
4676                 err = -EOPNOTSUPP;
4677                 goto out;
4678         }
4679
4680         if (!il->vif || !il_is_ready_rf(il)) {
4681                 /*
4682                  * Huh? But wait ... this can maybe happen when
4683                  * we're in the middle of a firmware restart!
4684                  */
4685                 err = -EBUSY;
4686                 goto out;
4687         }
4688
4689         /* success */
4690         vif->type = newtype;
4691         vif->p2p = false;
4692         il->iw_mode = newtype;
4693         il_teardown_interface(il, vif);
4694         err = 0;
4695
4696 out:
4697         D_MAC80211("leave err %d\n", err);
4698         mutex_unlock(&il->mutex);
4699
4700         return err;
4701 }
4702 EXPORT_SYMBOL(il_mac_change_interface);
4703
4704 void il_mac_flush(struct ieee80211_hw *hw, u32 queues, bool drop)
4705 {
4706         struct il_priv *il = hw->priv;
4707         unsigned long timeout = jiffies + msecs_to_jiffies(500);
4708         int i;
4709
4710         mutex_lock(&il->mutex);
4711         D_MAC80211("enter\n");
4712
4713         if (il->txq == NULL)
4714                 goto out;
4715
4716         for (i = 0; i < il->hw_params.max_txq_num; i++) {
4717                 struct il_queue *q;
4718
4719                 if (i == il->cmd_queue)
4720                         continue;
4721
4722                 q = &il->txq[i].q;
4723                 if (q->read_ptr == q->write_ptr)
4724                         continue;
4725
4726                 if (time_after(jiffies, timeout)) {
4727                         IL_ERR("Failed to flush queue %d\n", q->id);
4728                         break;
4729                 }
4730
4731                 msleep(20);
4732         }
4733 out:
4734         D_MAC80211("leave\n");
4735         mutex_unlock(&il->mutex);
4736 }
4737 EXPORT_SYMBOL(il_mac_flush);
4738
4739 /*
4740  * On every watchdog tick we check (latest) time stamp. If it does not
4741  * change during timeout period and queue is not empty we reset firmware.
4742  */
4743 static int
4744 il_check_stuck_queue(struct il_priv *il, int cnt)
4745 {
4746         struct il_tx_queue *txq = &il->txq[cnt];
4747         struct il_queue *q = &txq->q;
4748         unsigned long timeout;
4749         unsigned long now = jiffies;
4750         int ret;
4751
4752         if (q->read_ptr == q->write_ptr) {
4753                 txq->time_stamp = now;
4754                 return 0;
4755         }
4756
4757         timeout =
4758             txq->time_stamp +
4759             msecs_to_jiffies(il->cfg->wd_timeout);
4760
4761         if (time_after(now, timeout)) {
4762                 IL_ERR("Queue %d stuck for %u ms.\n", q->id,
4763                        jiffies_to_msecs(now - txq->time_stamp));
4764                 ret = il_force_reset(il, false);
4765                 return (ret == -EAGAIN) ? 0 : 1;
4766         }
4767
4768         return 0;
4769 }
4770
4771 /*
4772  * Making watchdog tick be a quarter of timeout assure we will
4773  * discover the queue hung between timeout and 1.25*timeout
4774  */
4775 #define IL_WD_TICK(timeout) ((timeout) / 4)
4776
4777 /*
4778  * Watchdog timer callback, we check each tx queue for stuck, if if hung
4779  * we reset the firmware. If everything is fine just rearm the timer.
4780  */
4781 void
4782 il_bg_watchdog(unsigned long data)
4783 {
4784         struct il_priv *il = (struct il_priv *)data;
4785         int cnt;
4786         unsigned long timeout;
4787
4788         if (test_bit(S_EXIT_PENDING, &il->status))
4789                 return;
4790
4791         timeout = il->cfg->wd_timeout;
4792         if (timeout == 0)
4793                 return;
4794
4795         /* monitor and check for stuck cmd queue */
4796         if (il_check_stuck_queue(il, il->cmd_queue))
4797                 return;
4798
4799         /* monitor and check for other stuck queues */
4800         for (cnt = 0; cnt < il->hw_params.max_txq_num; cnt++) {
4801                 /* skip as we already checked the command queue */
4802                 if (cnt == il->cmd_queue)
4803                         continue;
4804                 if (il_check_stuck_queue(il, cnt))
4805                         return;
4806         }
4807
4808         mod_timer(&il->watchdog,
4809                   jiffies + msecs_to_jiffies(IL_WD_TICK(timeout)));
4810 }
4811 EXPORT_SYMBOL(il_bg_watchdog);
4812
4813 void
4814 il_setup_watchdog(struct il_priv *il)
4815 {
4816         unsigned int timeout = il->cfg->wd_timeout;
4817
4818         if (timeout)
4819                 mod_timer(&il->watchdog,
4820                           jiffies + msecs_to_jiffies(IL_WD_TICK(timeout)));
4821         else
4822                 del_timer(&il->watchdog);
4823 }
4824 EXPORT_SYMBOL(il_setup_watchdog);
4825
4826 /*
4827  * extended beacon time format
4828  * time in usec will be changed into a 32-bit value in extended:internal format
4829  * the extended part is the beacon counts
4830  * the internal part is the time in usec within one beacon interval
4831  */
4832 u32
4833 il_usecs_to_beacons(struct il_priv *il, u32 usec, u32 beacon_interval)
4834 {
4835         u32 quot;
4836         u32 rem;
4837         u32 interval = beacon_interval * TIME_UNIT;
4838
4839         if (!interval || !usec)
4840                 return 0;
4841
4842         quot =
4843             (usec /
4844              interval) & (il_beacon_time_mask_high(il,
4845                                                    il->hw_params.
4846                                                    beacon_time_tsf_bits) >> il->
4847                           hw_params.beacon_time_tsf_bits);
4848         rem =
4849             (usec % interval) & il_beacon_time_mask_low(il,
4850                                                         il->hw_params.
4851                                                         beacon_time_tsf_bits);
4852
4853         return (quot << il->hw_params.beacon_time_tsf_bits) + rem;
4854 }
4855 EXPORT_SYMBOL(il_usecs_to_beacons);
4856
4857 /* base is usually what we get from ucode with each received frame,
4858  * the same as HW timer counter counting down
4859  */
4860 __le32
4861 il_add_beacon_time(struct il_priv *il, u32 base, u32 addon,
4862                    u32 beacon_interval)
4863 {
4864         u32 base_low = base & il_beacon_time_mask_low(il,
4865                                                       il->hw_params.
4866                                                       beacon_time_tsf_bits);
4867         u32 addon_low = addon & il_beacon_time_mask_low(il,
4868                                                         il->hw_params.
4869                                                         beacon_time_tsf_bits);
4870         u32 interval = beacon_interval * TIME_UNIT;
4871         u32 res = (base & il_beacon_time_mask_high(il,
4872                                                    il->hw_params.
4873                                                    beacon_time_tsf_bits)) +
4874             (addon & il_beacon_time_mask_high(il,
4875                                               il->hw_params.
4876                                               beacon_time_tsf_bits));
4877
4878         if (base_low > addon_low)
4879                 res += base_low - addon_low;
4880         else if (base_low < addon_low) {
4881                 res += interval + base_low - addon_low;
4882                 res += (1 << il->hw_params.beacon_time_tsf_bits);
4883         } else
4884                 res += (1 << il->hw_params.beacon_time_tsf_bits);
4885
4886         return cpu_to_le32(res);
4887 }
4888 EXPORT_SYMBOL(il_add_beacon_time);
4889
4890 #ifdef CONFIG_PM_SLEEP
4891
4892 static int
4893 il_pci_suspend(struct device *device)
4894 {
4895         struct pci_dev *pdev = to_pci_dev(device);
4896         struct il_priv *il = pci_get_drvdata(pdev);
4897
4898         /*
4899          * This function is called when system goes into suspend state
4900          * mac80211 will call il_mac_stop() from the mac80211 suspend function
4901          * first but since il_mac_stop() has no knowledge of who the caller is,
4902          * it will not call apm_ops.stop() to stop the DMA operation.
4903          * Calling apm_ops.stop here to make sure we stop the DMA.
4904          */
4905         il_apm_stop(il);
4906
4907         return 0;
4908 }
4909
4910 static int
4911 il_pci_resume(struct device *device)
4912 {
4913         struct pci_dev *pdev = to_pci_dev(device);
4914         struct il_priv *il = pci_get_drvdata(pdev);
4915         bool hw_rfkill = false;
4916
4917         /*
4918          * We disable the RETRY_TIMEOUT register (0x41) to keep
4919          * PCI Tx retries from interfering with C3 CPU state.
4920          */
4921         pci_write_config_byte(pdev, PCI_CFG_RETRY_TIMEOUT, 0x00);
4922
4923         il_enable_interrupts(il);
4924
4925         if (!(_il_rd(il, CSR_GP_CNTRL) & CSR_GP_CNTRL_REG_FLAG_HW_RF_KILL_SW))
4926                 hw_rfkill = true;
4927
4928         if (hw_rfkill)
4929                 set_bit(S_RFKILL, &il->status);
4930         else
4931                 clear_bit(S_RFKILL, &il->status);
4932
4933         wiphy_rfkill_set_hw_state(il->hw->wiphy, hw_rfkill);
4934
4935         return 0;
4936 }
4937
4938 SIMPLE_DEV_PM_OPS(il_pm_ops, il_pci_suspend, il_pci_resume);
4939 EXPORT_SYMBOL(il_pm_ops);
4940
4941 #endif /* CONFIG_PM_SLEEP */
4942
4943 static void
4944 il_update_qos(struct il_priv *il)
4945 {
4946         if (test_bit(S_EXIT_PENDING, &il->status))
4947                 return;
4948
4949         il->qos_data.def_qos_parm.qos_flags = 0;
4950
4951         if (il->qos_data.qos_active)
4952                 il->qos_data.def_qos_parm.qos_flags |=
4953                     QOS_PARAM_FLG_UPDATE_EDCA_MSK;
4954
4955         if (il->ht.enabled)
4956                 il->qos_data.def_qos_parm.qos_flags |= QOS_PARAM_FLG_TGN_MSK;
4957
4958         D_QOS("send QoS cmd with Qos active=%d FLAGS=0x%X\n",
4959               il->qos_data.qos_active, il->qos_data.def_qos_parm.qos_flags);
4960
4961         il_send_cmd_pdu_async(il, C_QOS_PARAM, sizeof(struct il_qosparam_cmd),
4962                               &il->qos_data.def_qos_parm, NULL);
4963 }
4964
4965 /**
4966  * il_mac_config - mac80211 config callback
4967  */
4968 int
4969 il_mac_config(struct ieee80211_hw *hw, u32 changed)
4970 {
4971         struct il_priv *il = hw->priv;
4972         const struct il_channel_info *ch_info;
4973         struct ieee80211_conf *conf = &hw->conf;
4974         struct ieee80211_channel *channel = conf->chandef.chan;
4975         struct il_ht_config *ht_conf = &il->current_ht_config;
4976         unsigned long flags = 0;
4977         int ret = 0;
4978         u16 ch;
4979         int scan_active = 0;
4980         bool ht_changed = false;
4981
4982         mutex_lock(&il->mutex);
4983         D_MAC80211("enter: channel %d changed 0x%X\n", channel->hw_value,
4984                    changed);
4985
4986         if (unlikely(test_bit(S_SCANNING, &il->status))) {
4987                 scan_active = 1;
4988                 D_MAC80211("scan active\n");
4989         }
4990
4991         if (changed &
4992             (IEEE80211_CONF_CHANGE_SMPS | IEEE80211_CONF_CHANGE_CHANNEL)) {
4993                 /* mac80211 uses static for non-HT which is what we want */
4994                 il->current_ht_config.smps = conf->smps_mode;
4995
4996                 /*
4997                  * Recalculate chain counts.
4998                  *
4999                  * If monitor mode is enabled then mac80211 will
5000                  * set up the SM PS mode to OFF if an HT channel is
5001                  * configured.
5002                  */
5003                 if (il->ops->set_rxon_chain)
5004                         il->ops->set_rxon_chain(il);
5005         }
5006
5007         /* during scanning mac80211 will delay channel setting until
5008          * scan finish with changed = 0
5009          */
5010         if (!changed || (changed & IEEE80211_CONF_CHANGE_CHANNEL)) {
5011
5012                 if (scan_active)
5013                         goto set_ch_out;
5014
5015                 ch = channel->hw_value;
5016                 ch_info = il_get_channel_info(il, channel->band, ch);
5017                 if (!il_is_channel_valid(ch_info)) {
5018                         D_MAC80211("leave - invalid channel\n");
5019                         ret = -EINVAL;
5020                         goto set_ch_out;
5021                 }
5022
5023                 if (il->iw_mode == NL80211_IFTYPE_ADHOC &&
5024                     !il_is_channel_ibss(ch_info)) {
5025                         D_MAC80211("leave - not IBSS channel\n");
5026                         ret = -EINVAL;
5027                         goto set_ch_out;
5028                 }
5029
5030                 spin_lock_irqsave(&il->lock, flags);
5031
5032                 /* Configure HT40 channels */
5033                 if (il->ht.enabled != conf_is_ht(conf)) {
5034                         il->ht.enabled = conf_is_ht(conf);
5035                         ht_changed = true;
5036                 }
5037                 if (il->ht.enabled) {
5038                         if (conf_is_ht40_minus(conf)) {
5039                                 il->ht.extension_chan_offset =
5040                                     IEEE80211_HT_PARAM_CHA_SEC_BELOW;
5041                                 il->ht.is_40mhz = true;
5042                         } else if (conf_is_ht40_plus(conf)) {
5043                                 il->ht.extension_chan_offset =
5044                                     IEEE80211_HT_PARAM_CHA_SEC_ABOVE;
5045                                 il->ht.is_40mhz = true;
5046                         } else {
5047                                 il->ht.extension_chan_offset =
5048                                     IEEE80211_HT_PARAM_CHA_SEC_NONE;
5049                                 il->ht.is_40mhz = false;
5050                         }
5051                 } else
5052                         il->ht.is_40mhz = false;
5053
5054                 /*
5055                  * Default to no protection. Protection mode will
5056                  * later be set from BSS config in il_ht_conf
5057                  */
5058                 il->ht.protection = IEEE80211_HT_OP_MODE_PROTECTION_NONE;
5059
5060                 /* if we are switching from ht to 2.4 clear flags
5061                  * from any ht related info since 2.4 does not
5062                  * support ht */
5063                 if ((le16_to_cpu(il->staging.channel) != ch))
5064                         il->staging.flags = 0;
5065
5066                 il_set_rxon_channel(il, channel);
5067                 il_set_rxon_ht(il, ht_conf);
5068
5069                 il_set_flags_for_band(il, channel->band, il->vif);
5070
5071                 spin_unlock_irqrestore(&il->lock, flags);
5072
5073                 if (il->ops->update_bcast_stations)
5074                         ret = il->ops->update_bcast_stations(il);
5075
5076 set_ch_out:
5077                 /* The list of supported rates and rate mask can be different
5078                  * for each band; since the band may have changed, reset
5079                  * the rate mask to what mac80211 lists */
5080                 il_set_rate(il);
5081         }
5082
5083         if (changed & (IEEE80211_CONF_CHANGE_PS | IEEE80211_CONF_CHANGE_IDLE)) {
5084                 ret = il_power_update_mode(il, false);
5085                 if (ret)
5086                         D_MAC80211("Error setting sleep level\n");
5087         }
5088
5089         if (changed & IEEE80211_CONF_CHANGE_POWER) {
5090                 D_MAC80211("TX Power old=%d new=%d\n", il->tx_power_user_lmt,
5091                            conf->power_level);
5092
5093                 il_set_tx_power(il, conf->power_level, false);
5094         }
5095
5096         if (!il_is_ready(il)) {
5097                 D_MAC80211("leave - not ready\n");
5098                 goto out;
5099         }
5100
5101         if (scan_active)
5102                 goto out;
5103
5104         if (memcmp(&il->active, &il->staging, sizeof(il->staging)))
5105                 il_commit_rxon(il);
5106         else
5107                 D_INFO("Not re-sending same RXON configuration.\n");
5108         if (ht_changed)
5109                 il_update_qos(il);
5110
5111 out:
5112         D_MAC80211("leave ret %d\n", ret);
5113         mutex_unlock(&il->mutex);
5114
5115         return ret;
5116 }
5117 EXPORT_SYMBOL(il_mac_config);
5118
5119 void
5120 il_mac_reset_tsf(struct ieee80211_hw *hw, struct ieee80211_vif *vif)
5121 {
5122         struct il_priv *il = hw->priv;
5123         unsigned long flags;
5124
5125         mutex_lock(&il->mutex);
5126         D_MAC80211("enter: type %d, addr %pM\n", vif->type, vif->addr);
5127
5128         spin_lock_irqsave(&il->lock, flags);
5129
5130         memset(&il->current_ht_config, 0, sizeof(struct il_ht_config));
5131
5132         /* new association get rid of ibss beacon skb */
5133         if (il->beacon_skb)
5134                 dev_kfree_skb(il->beacon_skb);
5135         il->beacon_skb = NULL;
5136         il->timestamp = 0;
5137
5138         spin_unlock_irqrestore(&il->lock, flags);
5139
5140         il_scan_cancel_timeout(il, 100);
5141         if (!il_is_ready_rf(il)) {
5142                 D_MAC80211("leave - not ready\n");
5143                 mutex_unlock(&il->mutex);
5144                 return;
5145         }
5146
5147         /* we are restarting association process */
5148         il->staging.filter_flags &= ~RXON_FILTER_ASSOC_MSK;
5149         il_commit_rxon(il);
5150
5151         il_set_rate(il);
5152
5153         D_MAC80211("leave\n");
5154         mutex_unlock(&il->mutex);
5155 }
5156 EXPORT_SYMBOL(il_mac_reset_tsf);
5157
5158 static void
5159 il_ht_conf(struct il_priv *il, struct ieee80211_vif *vif)
5160 {
5161         struct il_ht_config *ht_conf = &il->current_ht_config;
5162         struct ieee80211_sta *sta;
5163         struct ieee80211_bss_conf *bss_conf = &vif->bss_conf;
5164
5165         D_ASSOC("enter:\n");
5166
5167         if (!il->ht.enabled)
5168                 return;
5169
5170         il->ht.protection =
5171             bss_conf->ht_operation_mode & IEEE80211_HT_OP_MODE_PROTECTION;
5172         il->ht.non_gf_sta_present =
5173             !!(bss_conf->
5174                ht_operation_mode & IEEE80211_HT_OP_MODE_NON_GF_STA_PRSNT);
5175
5176         ht_conf->single_chain_sufficient = false;
5177
5178         switch (vif->type) {
5179         case NL80211_IFTYPE_STATION:
5180                 rcu_read_lock();
5181                 sta = ieee80211_find_sta(vif, bss_conf->bssid);
5182                 if (sta) {
5183                         struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap;
5184                         int maxstreams;
5185
5186                         maxstreams =
5187                             (ht_cap->mcs.
5188                              tx_params & IEEE80211_HT_MCS_TX_MAX_STREAMS_MASK)
5189                             >> IEEE80211_HT_MCS_TX_MAX_STREAMS_SHIFT;
5190                         maxstreams += 1;
5191
5192                         if (ht_cap->mcs.rx_mask[1] == 0 &&
5193                             ht_cap->mcs.rx_mask[2] == 0)
5194                                 ht_conf->single_chain_sufficient = true;
5195                         if (maxstreams <= 1)
5196                                 ht_conf->single_chain_sufficient = true;
5197                 } else {
5198                         /*
5199                          * If at all, this can only happen through a race
5200                          * when the AP disconnects us while we're still
5201                          * setting up the connection, in that case mac80211
5202                          * will soon tell us about that.
5203                          */
5204                         ht_conf->single_chain_sufficient = true;
5205                 }
5206                 rcu_read_unlock();
5207                 break;
5208         case NL80211_IFTYPE_ADHOC:
5209                 ht_conf->single_chain_sufficient = true;
5210                 break;
5211         default:
5212                 break;
5213         }
5214
5215         D_ASSOC("leave\n");
5216 }
5217
5218 static inline void
5219 il_set_no_assoc(struct il_priv *il, struct ieee80211_vif *vif)
5220 {
5221         /*
5222          * inform the ucode that there is no longer an
5223          * association and that no more packets should be
5224          * sent
5225          */
5226         il->staging.filter_flags &= ~RXON_FILTER_ASSOC_MSK;
5227         il->staging.assoc_id = 0;
5228         il_commit_rxon(il);
5229 }
5230
5231 static void
5232 il_beacon_update(struct ieee80211_hw *hw, struct ieee80211_vif *vif)
5233 {
5234         struct il_priv *il = hw->priv;
5235         unsigned long flags;
5236         __le64 timestamp;
5237         struct sk_buff *skb = ieee80211_beacon_get(hw, vif);
5238
5239         if (!skb)
5240                 return;
5241
5242         D_MAC80211("enter\n");
5243
5244         lockdep_assert_held(&il->mutex);
5245
5246         if (!il->beacon_enabled) {
5247                 IL_ERR("update beacon with no beaconing enabled\n");
5248                 dev_kfree_skb(skb);
5249                 return;
5250         }
5251
5252         spin_lock_irqsave(&il->lock, flags);
5253
5254         if (il->beacon_skb)
5255                 dev_kfree_skb(il->beacon_skb);
5256
5257         il->beacon_skb = skb;
5258
5259         timestamp = ((struct ieee80211_mgmt *)skb->data)->u.beacon.timestamp;
5260         il->timestamp = le64_to_cpu(timestamp);
5261
5262         D_MAC80211("leave\n");
5263         spin_unlock_irqrestore(&il->lock, flags);
5264
5265         if (!il_is_ready_rf(il)) {
5266                 D_MAC80211("leave - RF not ready\n");
5267                 return;
5268         }
5269
5270         il->ops->post_associate(il);
5271 }
5272
5273 void
5274 il_mac_bss_info_changed(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
5275                         struct ieee80211_bss_conf *bss_conf, u32 changes)
5276 {
5277         struct il_priv *il = hw->priv;
5278         int ret;
5279
5280         mutex_lock(&il->mutex);
5281         D_MAC80211("enter: changes 0x%x\n", changes);
5282
5283         if (!il_is_alive(il)) {
5284                 D_MAC80211("leave - not alive\n");
5285                 mutex_unlock(&il->mutex);
5286                 return;
5287         }
5288
5289         if (changes & BSS_CHANGED_QOS) {
5290                 unsigned long flags;
5291
5292                 spin_lock_irqsave(&il->lock, flags);
5293                 il->qos_data.qos_active = bss_conf->qos;
5294                 il_update_qos(il);
5295                 spin_unlock_irqrestore(&il->lock, flags);
5296         }
5297
5298         if (changes & BSS_CHANGED_BEACON_ENABLED) {
5299                 /* FIXME: can we remove beacon_enabled ? */
5300                 if (vif->bss_conf.enable_beacon)
5301                         il->beacon_enabled = true;
5302                 else
5303                         il->beacon_enabled = false;
5304         }
5305
5306         if (changes & BSS_CHANGED_BSSID) {
5307                 D_MAC80211("BSSID %pM\n", bss_conf->bssid);
5308
5309                 /*
5310                  * On passive channel we wait with blocked queues to see if
5311                  * there is traffic on that channel. If no frame will be
5312                  * received (what is very unlikely since scan detects AP on
5313                  * that channel, but theoretically possible), mac80211 associate
5314                  * procedure will time out and mac80211 will call us with NULL
5315                  * bssid. We have to unblock queues on such condition.
5316                  */
5317                 if (is_zero_ether_addr(bss_conf->bssid))
5318                         il_wake_queues_by_reason(il, IL_STOP_REASON_PASSIVE);
5319
5320                 /*
5321                  * If there is currently a HW scan going on in the background,
5322                  * then we need to cancel it, otherwise sometimes we are not
5323                  * able to authenticate (FIXME: why ?)
5324                  */
5325                 if (il_scan_cancel_timeout(il, 100)) {
5326                         D_MAC80211("leave - scan abort failed\n");
5327                         mutex_unlock(&il->mutex);
5328                         return;
5329                 }
5330
5331                 /* mac80211 only sets assoc when in STATION mode */
5332                 memcpy(il->staging.bssid_addr, bss_conf->bssid, ETH_ALEN);
5333
5334                 /* FIXME: currently needed in a few places */
5335                 memcpy(il->bssid, bss_conf->bssid, ETH_ALEN);
5336         }
5337
5338         /*
5339          * This needs to be after setting the BSSID in case
5340          * mac80211 decides to do both changes at once because
5341          * it will invoke post_associate.
5342          */
5343         if (vif->type == NL80211_IFTYPE_ADHOC && (changes & BSS_CHANGED_BEACON))
5344                 il_beacon_update(hw, vif);
5345
5346         if (changes & BSS_CHANGED_ERP_PREAMBLE) {
5347                 D_MAC80211("ERP_PREAMBLE %d\n", bss_conf->use_short_preamble);
5348                 if (bss_conf->use_short_preamble)
5349                         il->staging.flags |= RXON_FLG_SHORT_PREAMBLE_MSK;
5350                 else
5351                         il->staging.flags &= ~RXON_FLG_SHORT_PREAMBLE_MSK;
5352         }
5353
5354         if (changes & BSS_CHANGED_ERP_CTS_PROT) {
5355                 D_MAC80211("ERP_CTS %d\n", bss_conf->use_cts_prot);
5356                 if (bss_conf->use_cts_prot && il->band != IEEE80211_BAND_5GHZ)
5357                         il->staging.flags |= RXON_FLG_TGG_PROTECT_MSK;
5358                 else
5359                         il->staging.flags &= ~RXON_FLG_TGG_PROTECT_MSK;
5360                 if (bss_conf->use_cts_prot)
5361                         il->staging.flags |= RXON_FLG_SELF_CTS_EN;
5362                 else
5363                         il->staging.flags &= ~RXON_FLG_SELF_CTS_EN;
5364         }
5365
5366         if (changes & BSS_CHANGED_BASIC_RATES) {
5367                 /* XXX use this information
5368                  *
5369                  * To do that, remove code from il_set_rate() and put something
5370                  * like this here:
5371                  *
5372                  if (A-band)
5373                  il->staging.ofdm_basic_rates =
5374                  bss_conf->basic_rates;
5375                  else
5376                  il->staging.ofdm_basic_rates =
5377                  bss_conf->basic_rates >> 4;
5378                  il->staging.cck_basic_rates =
5379                  bss_conf->basic_rates & 0xF;
5380                  */
5381         }
5382
5383         if (changes & BSS_CHANGED_HT) {
5384                 il_ht_conf(il, vif);
5385
5386                 if (il->ops->set_rxon_chain)
5387                         il->ops->set_rxon_chain(il);
5388         }
5389
5390         if (changes & BSS_CHANGED_ASSOC) {
5391                 D_MAC80211("ASSOC %d\n", bss_conf->assoc);
5392                 if (bss_conf->assoc) {
5393                         il->timestamp = bss_conf->sync_tsf;
5394
5395                         if (!il_is_rfkill(il))
5396                                 il->ops->post_associate(il);
5397                 } else
5398                         il_set_no_assoc(il, vif);
5399         }
5400
5401         if (changes && il_is_associated(il) && bss_conf->aid) {
5402                 D_MAC80211("Changes (%#x) while associated\n", changes);
5403                 ret = il_send_rxon_assoc(il);
5404                 if (!ret) {
5405                         /* Sync active_rxon with latest change. */
5406                         memcpy((void *)&il->active, &il->staging,
5407                                sizeof(struct il_rxon_cmd));
5408                 }
5409         }
5410
5411         if (changes & BSS_CHANGED_BEACON_ENABLED) {
5412                 if (vif->bss_conf.enable_beacon) {
5413                         memcpy(il->staging.bssid_addr, bss_conf->bssid,
5414                                ETH_ALEN);
5415                         memcpy(il->bssid, bss_conf->bssid, ETH_ALEN);
5416                         il->ops->config_ap(il);
5417                 } else
5418                         il_set_no_assoc(il, vif);
5419         }
5420
5421         if (changes & BSS_CHANGED_IBSS) {
5422                 ret = il->ops->manage_ibss_station(il, vif,
5423                                                    bss_conf->ibss_joined);
5424                 if (ret)
5425                         IL_ERR("failed to %s IBSS station %pM\n",
5426                                bss_conf->ibss_joined ? "add" : "remove",
5427                                bss_conf->bssid);
5428         }
5429
5430         D_MAC80211("leave\n");
5431         mutex_unlock(&il->mutex);
5432 }
5433 EXPORT_SYMBOL(il_mac_bss_info_changed);
5434
5435 irqreturn_t
5436 il_isr(int irq, void *data)
5437 {
5438         struct il_priv *il = data;
5439         u32 inta, inta_mask;
5440         u32 inta_fh;
5441         unsigned long flags;
5442         if (!il)
5443                 return IRQ_NONE;
5444
5445         spin_lock_irqsave(&il->lock, flags);
5446
5447         /* Disable (but don't clear!) interrupts here to avoid
5448          *    back-to-back ISRs and sporadic interrupts from our NIC.
5449          * If we have something to service, the tasklet will re-enable ints.
5450          * If we *don't* have something, we'll re-enable before leaving here. */
5451         inta_mask = _il_rd(il, CSR_INT_MASK);   /* just for debug */
5452         _il_wr(il, CSR_INT_MASK, 0x00000000);
5453
5454         /* Discover which interrupts are active/pending */
5455         inta = _il_rd(il, CSR_INT);
5456         inta_fh = _il_rd(il, CSR_FH_INT_STATUS);
5457
5458         /* Ignore interrupt if there's nothing in NIC to service.
5459          * This may be due to IRQ shared with another device,
5460          * or due to sporadic interrupts thrown from our NIC. */
5461         if (!inta && !inta_fh) {
5462                 D_ISR("Ignore interrupt, inta == 0, inta_fh == 0\n");
5463                 goto none;
5464         }
5465
5466         if (inta == 0xFFFFFFFF || (inta & 0xFFFFFFF0) == 0xa5a5a5a0) {
5467                 /* Hardware disappeared. It might have already raised
5468                  * an interrupt */
5469                 IL_WARN("HARDWARE GONE?? INTA == 0x%08x\n", inta);
5470                 goto unplugged;
5471         }
5472
5473         D_ISR("ISR inta 0x%08x, enabled 0x%08x, fh 0x%08x\n", inta, inta_mask,
5474               inta_fh);
5475
5476         inta &= ~CSR_INT_BIT_SCD;
5477
5478         /* il_irq_tasklet() will service interrupts and re-enable them */
5479         if (likely(inta || inta_fh))
5480                 tasklet_schedule(&il->irq_tasklet);
5481
5482 unplugged:
5483         spin_unlock_irqrestore(&il->lock, flags);
5484         return IRQ_HANDLED;
5485
5486 none:
5487         /* re-enable interrupts here since we don't have anything to service. */
5488         /* only Re-enable if disabled by irq */
5489         if (test_bit(S_INT_ENABLED, &il->status))
5490                 il_enable_interrupts(il);
5491         spin_unlock_irqrestore(&il->lock, flags);
5492         return IRQ_NONE;
5493 }
5494 EXPORT_SYMBOL(il_isr);
5495
5496 /*
5497  *  il_tx_cmd_protection: Set rts/cts. 3945 and 4965 only share this
5498  *  function.
5499  */
5500 void
5501 il_tx_cmd_protection(struct il_priv *il, struct ieee80211_tx_info *info,
5502                      __le16 fc, __le32 *tx_flags)
5503 {
5504         if (info->control.rates[0].flags & IEEE80211_TX_RC_USE_RTS_CTS) {
5505                 *tx_flags |= TX_CMD_FLG_RTS_MSK;
5506                 *tx_flags &= ~TX_CMD_FLG_CTS_MSK;
5507                 *tx_flags |= TX_CMD_FLG_FULL_TXOP_PROT_MSK;
5508
5509                 if (!ieee80211_is_mgmt(fc))
5510                         return;
5511
5512                 switch (fc & cpu_to_le16(IEEE80211_FCTL_STYPE)) {
5513                 case cpu_to_le16(IEEE80211_STYPE_AUTH):
5514                 case cpu_to_le16(IEEE80211_STYPE_DEAUTH):
5515                 case cpu_to_le16(IEEE80211_STYPE_ASSOC_REQ):
5516                 case cpu_to_le16(IEEE80211_STYPE_REASSOC_REQ):
5517                         *tx_flags &= ~TX_CMD_FLG_RTS_MSK;
5518                         *tx_flags |= TX_CMD_FLG_CTS_MSK;
5519                         break;
5520                 }
5521         } else if (info->control.rates[0].
5522                    flags & IEEE80211_TX_RC_USE_CTS_PROTECT) {
5523                 *tx_flags &= ~TX_CMD_FLG_RTS_MSK;
5524                 *tx_flags |= TX_CMD_FLG_CTS_MSK;
5525                 *tx_flags |= TX_CMD_FLG_FULL_TXOP_PROT_MSK;
5526         }
5527 }
5528 EXPORT_SYMBOL(il_tx_cmd_protection);