drivers/net/wireless/rt2x00/rt2800mmio.c

   1 /*      Copyright (C) 2009 - 2010 Ivo van Doorn <IvDoorn@gmail.com>
   2  *      Copyright (C) 2009 Alban Browaeys <prahal@yahoo.com>
   3  *      Copyright (C) 2009 Felix Fietkau <nbd@openwrt.org>
   4  *      Copyright (C) 2009 Luis Correia <luis.f.correia@gmail.com>
   5  *      Copyright (C) 2009 Mattias Nissler <mattias.nissler@gmx.de>
   6  *      Copyright (C) 2009 Mark Asselstine <asselsm@gmail.com>
   7  *      Copyright (C) 2009 Xose Vazquez Perez <xose.vazquez@gmail.com>
   8  *      Copyright (C) 2009 Bart Zolnierkiewicz <bzolnier@gmail.com>
   9  *      <http://rt2x00.serialmonkey.com>
  10  *
  11  *      This program is free software; you can redistribute it and/or modify
  12  *      it under the terms of the GNU General Public License as published by
  13  *      the Free Software Foundation; either version 2 of the License, or
  14  *      (at your option) any later version.
  15  *
  16  *      This program is distributed in the hope that it will be useful,
  17  *      but WITHOUT ANY WARRANTY; without even the implied warranty of
  18  *      MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  19  *      GNU General Public License for more details.
  20  *
  21  *      You should have received a copy of the GNU General Public License
  22  *      along with this program; if not, write to the
  23  *      Free Software Foundation, Inc.,
  24  *      59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  25  */
  26
  27 /*      Module: rt2800mmio
  28  *      Abstract: rt2800 MMIO device routines.
  29  */
  30
  31 #include <linux/kernel.h>
  32 #include <linux/module.h>
  33 #include <linux/export.h>
  34
  35 #include "rt2x00.h"
  36 #include "rt2x00mmio.h"
  37 #include "rt2800.h"
  38 #include "rt2800lib.h"
  39 #include "rt2800mmio.h"
  40
  41 /*
  42  * TX descriptor initialization
  43  */
  44 __le32 *rt2800mmio_get_txwi(struct queue_entry *entry)
  45 {
  46         return (__le32 *) entry->skb->data;
  47 }
  48 EXPORT_SYMBOL_GPL(rt2800mmio_get_txwi);
  49
  50 void rt2800mmio_write_tx_desc(struct queue_entry *entry,
  51                               struct txentry_desc *txdesc)
  52 {
  53         struct skb_frame_desc *skbdesc = get_skb_frame_desc(entry->skb);
  54         struct queue_entry_priv_mmio *entry_priv = entry->priv_data;
  55         __le32 *txd = entry_priv->desc;
  56         u32 word;
  57         const unsigned int txwi_size = entry->queue->winfo_size;
  58
  59         /*
  60          * The buffers pointed by SD_PTR0/SD_LEN0 and SD_PTR1/SD_LEN1
  61          * must contains a TXWI structure + 802.11 header + padding + 802.11
  62          * data. We choose to have SD_PTR0/SD_LEN0 only contains TXWI and
  63          * SD_PTR1/SD_LEN1 contains 802.11 header + padding + 802.11
  64          * data. It means that LAST_SEC0 is always 0.
  65          */
  66
  67         /*
  68          * Initialize TX descriptor
  69          */
  70         word = 0;
  71         rt2x00_set_field32(&word, TXD_W0_SD_PTR0, skbdesc->skb_dma);
  72         rt2x00_desc_write(txd, 0, word);
  73
  74         word = 0;
  75         rt2x00_set_field32(&word, TXD_W1_SD_LEN1, entry->skb->len);
  76         rt2x00_set_field32(&word, TXD_W1_LAST_SEC1,
  77                            !test_bit(ENTRY_TXD_MORE_FRAG, &txdesc->flags));
  78         rt2x00_set_field32(&word, TXD_W1_BURST,
  79                            test_bit(ENTRY_TXD_BURST, &txdesc->flags));
  80         rt2x00_set_field32(&word, TXD_W1_SD_LEN0, txwi_size);
  81         rt2x00_set_field32(&word, TXD_W1_LAST_SEC0, 0);
  82         rt2x00_set_field32(&word, TXD_W1_DMA_DONE, 0);
  83         rt2x00_desc_write(txd, 1, word);
  84
  85         word = 0;
  86         rt2x00_set_field32(&word, TXD_W2_SD_PTR1,
  87                            skbdesc->skb_dma + txwi_size);
  88         rt2x00_desc_write(txd, 2, word);
  89
  90         word = 0;
  91         rt2x00_set_field32(&word, TXD_W3_WIV,
  92                            !test_bit(ENTRY_TXD_ENCRYPT_IV, &txdesc->flags));
  93         rt2x00_set_field32(&word, TXD_W3_QSEL, 2);
  94         rt2x00_desc_write(txd, 3, word);
  95
  96         /*
  97          * Register descriptor details in skb frame descriptor.
  98          */
  99         skbdesc->desc = txd;
 100         skbdesc->desc_len = TXD_DESC_SIZE;
 101 }
 102 EXPORT_SYMBOL_GPL(rt2800mmio_write_tx_desc);
 103
 104 /*
 105  * RX control handlers
 106  */
 107 void rt2800mmio_fill_rxdone(struct queue_entry *entry,
 108                             struct rxdone_entry_desc *rxdesc)
 109 {
 110         struct queue_entry_priv_mmio *entry_priv = entry->priv_data;
 111         __le32 *rxd = entry_priv->desc;
 112         u32 word;
 113
 114         rt2x00_desc_read(rxd, 3, &word);
 115
 116         if (rt2x00_get_field32(word, RXD_W3_CRC_ERROR))
 117                 rxdesc->flags |= RX_FLAG_FAILED_FCS_CRC;
 118
 119         /*
 120          * Unfortunately we don't know the cipher type used during
 121          * decryption. This prevents us from correct providing
 122          * correct statistics through debugfs.
 123          */
 124         rxdesc->cipher_status = rt2x00_get_field32(word, RXD_W3_CIPHER_ERROR);
 125
 126         if (rt2x00_get_field32(word, RXD_W3_DECRYPTED)) {
 127                 /*
 128                  * Hardware has stripped IV/EIV data from 802.11 frame during
 129                  * decryption. Unfortunately the descriptor doesn't contain
 130                  * any fields with the EIV/IV data either, so they can't
 131                  * be restored by rt2x00lib.
 132                  */
 133                 rxdesc->flags |= RX_FLAG_IV_STRIPPED;
 134
 135                 /*
 136                  * The hardware has already checked the Michael Mic and has
 137                  * stripped it from the frame. Signal this to mac80211.
 138                  */
 139                 rxdesc->flags |= RX_FLAG_MMIC_STRIPPED;
 140
 141                 if (rxdesc->cipher_status == RX_CRYPTO_SUCCESS)
 142                         rxdesc->flags |= RX_FLAG_DECRYPTED;
 143                 else if (rxdesc->cipher_status == RX_CRYPTO_FAIL_MIC)
 144                         rxdesc->flags |= RX_FLAG_MMIC_ERROR;
 145         }
 146
 147         if (rt2x00_get_field32(word, RXD_W3_MY_BSS))
 148                 rxdesc->dev_flags |= RXDONE_MY_BSS;
 149
 150         if (rt2x00_get_field32(word, RXD_W3_L2PAD))
 151                 rxdesc->dev_flags |= RXDONE_L2PAD;
 152
 153         /*
 154          * Process the RXWI structure that is at the start of the buffer.
 155          */
 156         rt2800_process_rxwi(entry, rxdesc);
 157 }
 158 EXPORT_SYMBOL_GPL(rt2800mmio_fill_rxdone);
 159
 160 /*
 161  * Interrupt functions.
 162  */
 163 static void rt2800mmio_wakeup(struct rt2x00_dev *rt2x00dev)
 164 {
 165         struct ieee80211_conf conf = { .flags = 0 };
 166         struct rt2x00lib_conf libconf = { .conf = &conf };
 167
 168         rt2800_config(rt2x00dev, &libconf, IEEE80211_CONF_CHANGE_PS);
 169 }
 170
 171 static bool rt2800mmio_txdone_entry_check(struct queue_entry *entry, u32 status)
 172 {
 173         __le32 *txwi;
 174         u32 word;
 175         int wcid, tx_wcid;
 176
 177         wcid = rt2x00_get_field32(status, TX_STA_FIFO_WCID);
 178
 179         txwi = rt2800_drv_get_txwi(entry);
 180         rt2x00_desc_read(txwi, 1, &word);
 181         tx_wcid = rt2x00_get_field32(word, TXWI_W1_WIRELESS_CLI_ID);
 182
 183         return (tx_wcid == wcid);
 184 }
 185
 186 static bool rt2800mmio_txdone_find_entry(struct queue_entry *entry, void *data)
 187 {
 188         u32 status = *(u32 *)data;
 189
 190         /*
 191          * rt2800pci hardware might reorder frames when exchanging traffic
 192          * with multiple BA enabled STAs.
 193          *
 194          * For example, a tx queue
 195          *    [ STA1 | STA2 | STA1 | STA2 ]
 196          * can result in tx status reports
 197          *    [ STA1 | STA1 | STA2 | STA2 ]
 198          * when the hw decides to aggregate the frames for STA1 into one AMPDU.
 199          *
 200          * To mitigate this effect, associate the tx status to the first frame
 201          * in the tx queue with a matching wcid.
 202          */
 203         if (rt2800mmio_txdone_entry_check(entry, status) &&
 204             !test_bit(ENTRY_DATA_STATUS_SET, &entry->flags)) {
 205                 /*
 206                  * Got a matching frame, associate the tx status with
 207                  * the frame
 208                  */
 209                 entry->status = status;
 210                 set_bit(ENTRY_DATA_STATUS_SET, &entry->flags);
 211                 return true;
 212         }
 213
 214         /* Check the next frame */
 215         return false;
 216 }
 217
 218 static bool rt2800mmio_txdone_match_first(struct queue_entry *entry, void *data)
 219 {
 220         u32 status = *(u32 *)data;
 221
 222         /*
 223          * Find the first frame without tx status and assign this status to it
 224          * regardless if it matches or not.
 225          */
 226         if (!test_bit(ENTRY_DATA_STATUS_SET, &entry->flags)) {
 227                 /*
 228                  * Got a matching frame, associate the tx status with
 229                  * the frame
 230                  */
 231                 entry->status = status;
 232                 set_bit(ENTRY_DATA_STATUS_SET, &entry->flags);
 233                 return true;
 234         }
 235
 236         /* Check the next frame */
 237         return false;
 238 }
 239 static bool rt2800mmio_txdone_release_entries(struct queue_entry *entry,
 240                                               void *data)
 241 {
 242         if (test_bit(ENTRY_DATA_STATUS_SET, &entry->flags)) {
 243                 rt2800_txdone_entry(entry, entry->status,
 244                                     rt2800mmio_get_txwi(entry));
 245                 return false;
 246         }
 247
 248         /* No more frames to release */
 249         return true;
 250 }
 251
 252 static bool rt2800mmio_txdone(struct rt2x00_dev *rt2x00dev)
 253 {
 254         struct data_queue *queue;
 255         u32 status;
 256         u8 qid;
 257         int max_tx_done = 16;
 258
 259         while (kfifo_get(&rt2x00dev->txstatus_fifo, &status)) {
 260                 qid = rt2x00_get_field32(status, TX_STA_FIFO_PID_QUEUE);
 261                 if (unlikely(qid >= QID_RX)) {
 262                         /*
 263                          * Unknown queue, this shouldn't happen. Just drop
 264                          * this tx status.
 265                          */
 266                         rt2x00_warn(rt2x00dev, "Got TX status report with unexpected pid %u, dropping\n",
 267                                     qid);
 268                         break;
 269                 }
 270
 271                 queue = rt2x00queue_get_tx_queue(rt2x00dev, qid);
 272                 if (unlikely(queue == NULL)) {
 273                         /*
 274                          * The queue is NULL, this shouldn't happen. Stop
 275                          * processing here and drop the tx status
 276                          */
 277                         rt2x00_warn(rt2x00dev, "Got TX status for an unavailable queue %u, dropping\n",
 278                                     qid);
 279                         break;
 280                 }
 281
 282                 if (unlikely(rt2x00queue_empty(queue))) {
 283                         /*
 284                          * The queue is empty. Stop processing here
 285                          * and drop the tx status.
 286                          */
 287                         rt2x00_warn(rt2x00dev, "Got TX status for an empty queue %u, dropping\n",
 288                                     qid);
 289                         break;
 290                 }
 291
 292                 /*
 293                  * Let's associate this tx status with the first
 294                  * matching frame.
 295                  */
 296                 if (!rt2x00queue_for_each_entry(queue, Q_INDEX_DONE,
 297                                                 Q_INDEX, &status,
 298                                                 rt2800mmio_txdone_find_entry)) {
 299                         /*
 300                          * We cannot match the tx status to any frame, so just
 301                          * use the first one.
 302                          */
 303                         if (!rt2x00queue_for_each_entry(queue, Q_INDEX_DONE,
 304                                                         Q_INDEX, &status,
 305                                                         rt2800mmio_txdone_match_first)) {
 306                                 rt2x00_warn(rt2x00dev, "No frame found for TX status on queue %u, dropping\n",
 307                                             qid);
 308                                 break;
 309                         }
 310                 }
 311
 312                 /*
 313                  * Release all frames with a valid tx status.
 314                  */
 315                 rt2x00queue_for_each_entry(queue, Q_INDEX_DONE,
 316                                            Q_INDEX, NULL,
 317                                            rt2800mmio_txdone_release_entries);
 318
 319                 if (--max_tx_done == 0)
 320                         break;
 321         }
 322
 323         return !max_tx_done;
 324 }
 325
 326 static inline void rt2800mmio_enable_interrupt(struct rt2x00_dev *rt2x00dev,
 327                                                struct rt2x00_field32 irq_field)
 328 {
 329         u32 reg;
 330
 331         /*
 332          * Enable a single interrupt. The interrupt mask register
 333          * access needs locking.
 334          */
 335         spin_lock_irq(&rt2x00dev->irqmask_lock);
 336         rt2x00mmio_register_read(rt2x00dev, INT_MASK_CSR, &reg);
 337         rt2x00_set_field32(&reg, irq_field, 1);
 338         rt2x00mmio_register_write(rt2x00dev, INT_MASK_CSR, reg);
 339         spin_unlock_irq(&rt2x00dev->irqmask_lock);
 340 }
 341
 342 void rt2800mmio_txstatus_tasklet(unsigned long data)
 343 {
 344         struct rt2x00_dev *rt2x00dev = (struct rt2x00_dev *)data;
 345         if (rt2800mmio_txdone(rt2x00dev))
 346                 tasklet_schedule(&rt2x00dev->txstatus_tasklet);
 347
 348         /*
 349          * No need to enable the tx status interrupt here as we always
 350          * leave it enabled to minimize the possibility of a tx status
 351          * register overflow. See comment in interrupt handler.
 352          */
 353 }
 354 EXPORT_SYMBOL_GPL(rt2800mmio_txstatus_tasklet);
 355
 356 void rt2800mmio_pretbtt_tasklet(unsigned long data)
 357 {
 358         struct rt2x00_dev *rt2x00dev = (struct rt2x00_dev *)data;
 359         rt2x00lib_pretbtt(rt2x00dev);
 360         if (test_bit(DEVICE_STATE_ENABLED_RADIO, &rt2x00dev->flags))
 361                 rt2800mmio_enable_interrupt(rt2x00dev, INT_MASK_CSR_PRE_TBTT);
 362 }
 363 EXPORT_SYMBOL_GPL(rt2800mmio_pretbtt_tasklet);
 364
 365 void rt2800mmio_tbtt_tasklet(unsigned long data)
 366 {
 367         struct rt2x00_dev *rt2x00dev = (struct rt2x00_dev *)data;
 368         struct rt2800_drv_data *drv_data = rt2x00dev->drv_data;
 369         u32 reg;
 370
 371         rt2x00lib_beacondone(rt2x00dev);
 372
 373         if (rt2x00dev->intf_ap_count) {
 374                 /*
 375                  * The rt2800pci hardware tbtt timer is off by 1us per tbtt
 376                  * causing beacon skew and as a result causing problems with
 377                  * some powersaving clients over time. Shorten the beacon
 378                  * interval every 64 beacons by 64us to mitigate this effect.
 379                  */
 380                 if (drv_data->tbtt_tick == (BCN_TBTT_OFFSET - 2)) {
 381                         rt2x00mmio_register_read(rt2x00dev, BCN_TIME_CFG, &reg);
 382                         rt2x00_set_field32(&reg, BCN_TIME_CFG_BEACON_INTERVAL,
 383                                            (rt2x00dev->beacon_int * 16) - 1);
 384                         rt2x00mmio_register_write(rt2x00dev, BCN_TIME_CFG, reg);
 385                 } else if (drv_data->tbtt_tick == (BCN_TBTT_OFFSET - 1)) {
 386                         rt2x00mmio_register_read(rt2x00dev, BCN_TIME_CFG, &reg);
 387                         rt2x00_set_field32(&reg, BCN_TIME_CFG_BEACON_INTERVAL,
 388                                            (rt2x00dev->beacon_int * 16));
 389                         rt2x00mmio_register_write(rt2x00dev, BCN_TIME_CFG, reg);
 390                 }
 391                 drv_data->tbtt_tick++;
 392                 drv_data->tbtt_tick %= BCN_TBTT_OFFSET;
 393         }
 394
 395         if (test_bit(DEVICE_STATE_ENABLED_RADIO, &rt2x00dev->flags))
 396                 rt2800mmio_enable_interrupt(rt2x00dev, INT_MASK_CSR_TBTT);
 397 }
 398 EXPORT_SYMBOL_GPL(rt2800mmio_tbtt_tasklet);
 399
 400 void rt2800mmio_rxdone_tasklet(unsigned long data)
 401 {
 402         struct rt2x00_dev *rt2x00dev = (struct rt2x00_dev *)data;
 403         if (rt2x00mmio_rxdone(rt2x00dev))
 404                 tasklet_schedule(&rt2x00dev->rxdone_tasklet);
 405         else if (test_bit(DEVICE_STATE_ENABLED_RADIO, &rt2x00dev->flags))
 406                 rt2800mmio_enable_interrupt(rt2x00dev, INT_MASK_CSR_RX_DONE);
 407 }
 408 EXPORT_SYMBOL_GPL(rt2800mmio_rxdone_tasklet);
 409
 410 void rt2800mmio_autowake_tasklet(unsigned long data)
 411 {
 412         struct rt2x00_dev *rt2x00dev = (struct rt2x00_dev *)data;
 413         rt2800mmio_wakeup(rt2x00dev);
 414         if (test_bit(DEVICE_STATE_ENABLED_RADIO, &rt2x00dev->flags))
 415                 rt2800mmio_enable_interrupt(rt2x00dev,
 416                                             INT_MASK_CSR_AUTO_WAKEUP);
 417 }
 418 EXPORT_SYMBOL_GPL(rt2800mmio_autowake_tasklet);
 419
 420 static void rt2800mmio_txstatus_interrupt(struct rt2x00_dev *rt2x00dev)
 421 {
 422         u32 status;
 423         int i;
 424
 425         /*
 426          * The TX_FIFO_STATUS interrupt needs special care. We should
 427          * read TX_STA_FIFO but we should do it immediately as otherwise
 428          * the register can overflow and we would lose status reports.
 429          *
 430          * Hence, read the TX_STA_FIFO register and copy all tx status
 431          * reports into a kernel FIFO which is handled in the txstatus
 432          * tasklet. We use a tasklet to process the tx status reports
 433          * because we can schedule the tasklet multiple times (when the
 434          * interrupt fires again during tx status processing).
 435          *
 436          * Furthermore we don't disable the TX_FIFO_STATUS
 437          * interrupt here but leave it enabled so that the TX_STA_FIFO
 438          * can also be read while the tx status tasklet gets executed.
 439          *
 440          * Since we have only one producer and one consumer we don't
 441          * need to lock the kfifo.
 442          */
 443         for (i = 0; i < rt2x00dev->tx->limit; i++) {
 444                 rt2x00mmio_register_read(rt2x00dev, TX_STA_FIFO, &status);
 445
 446                 if (!rt2x00_get_field32(status, TX_STA_FIFO_VALID))
 447                         break;
 448
 449                 if (!kfifo_put(&rt2x00dev->txstatus_fifo, &status)) {
 450                         rt2x00_warn(rt2x00dev, "TX status FIFO overrun, drop tx status report\n");
 451                         break;
 452                 }
 453         }
 454
 455         /* Schedule the tasklet for processing the tx status. */
 456         tasklet_schedule(&rt2x00dev->txstatus_tasklet);
 457 }
 458
 459 irqreturn_t rt2800mmio_interrupt(int irq, void *dev_instance)
 460 {
 461         struct rt2x00_dev *rt2x00dev = dev_instance;
 462         u32 reg, mask;
 463
 464         /* Read status and ACK all interrupts */
 465         rt2x00mmio_register_read(rt2x00dev, INT_SOURCE_CSR, &reg);
 466         rt2x00mmio_register_write(rt2x00dev, INT_SOURCE_CSR, reg);
 467
 468         if (!reg)
 469                 return IRQ_NONE;
 470
 471         if (!test_bit(DEVICE_STATE_ENABLED_RADIO, &rt2x00dev->flags))
 472                 return IRQ_HANDLED;
 473
 474         /*
 475          * Since INT_MASK_CSR and INT_SOURCE_CSR use the same bits
 476          * for interrupts and interrupt masks we can just use the value of
 477          * INT_SOURCE_CSR to create the interrupt mask.
 478          */
 479         mask = ~reg;
 480
 481         if (rt2x00_get_field32(reg, INT_SOURCE_CSR_TX_FIFO_STATUS)) {
 482                 rt2800mmio_txstatus_interrupt(rt2x00dev);
 483                 /*
 484                  * Never disable the TX_FIFO_STATUS interrupt.
 485                  */
 486                 rt2x00_set_field32(&mask, INT_MASK_CSR_TX_FIFO_STATUS, 1);
 487         }
 488
 489         if (rt2x00_get_field32(reg, INT_SOURCE_CSR_PRE_TBTT))
 490                 tasklet_hi_schedule(&rt2x00dev->pretbtt_tasklet);
 491
 492         if (rt2x00_get_field32(reg, INT_SOURCE_CSR_TBTT))
 493                 tasklet_hi_schedule(&rt2x00dev->tbtt_tasklet);
 494
 495         if (rt2x00_get_field32(reg, INT_SOURCE_CSR_RX_DONE))
 496                 tasklet_schedule(&rt2x00dev->rxdone_tasklet);
 497
 498         if (rt2x00_get_field32(reg, INT_SOURCE_CSR_AUTO_WAKEUP))
 499                 tasklet_schedule(&rt2x00dev->autowake_tasklet);
 500
 501         /*
 502          * Disable all interrupts for which a tasklet was scheduled right now,
 503          * the tasklet will reenable the appropriate interrupts.
 504          */
 505         spin_lock(&rt2x00dev->irqmask_lock);
 506         rt2x00mmio_register_read(rt2x00dev, INT_MASK_CSR, &reg);
 507         reg &= mask;
 508         rt2x00mmio_register_write(rt2x00dev, INT_MASK_CSR, reg);
 509         spin_unlock(&rt2x00dev->irqmask_lock);
 510
 511         return IRQ_HANDLED;
 512 }
 513 EXPORT_SYMBOL_GPL(rt2800mmio_interrupt);
 514
 515 void rt2800mmio_toggle_irq(struct rt2x00_dev *rt2x00dev,
 516                            enum dev_state state)
 517 {
 518         u32 reg;
 519         unsigned long flags;
 520
 521         /*
 522          * When interrupts are being enabled, the interrupt registers
 523          * should clear the register to assure a clean state.
 524          */
 525         if (state == STATE_RADIO_IRQ_ON) {
 526                 rt2x00mmio_register_read(rt2x00dev, INT_SOURCE_CSR, &reg);
 527                 rt2x00mmio_register_write(rt2x00dev, INT_SOURCE_CSR, reg);
 528         }
 529
 530         spin_lock_irqsave(&rt2x00dev->irqmask_lock, flags);
 531         reg = 0;
 532         if (state == STATE_RADIO_IRQ_ON) {
 533                 rt2x00_set_field32(&reg, INT_MASK_CSR_RX_DONE, 1);
 534                 rt2x00_set_field32(&reg, INT_MASK_CSR_TBTT, 1);
 535                 rt2x00_set_field32(&reg, INT_MASK_CSR_PRE_TBTT, 1);
 536                 rt2x00_set_field32(&reg, INT_MASK_CSR_TX_FIFO_STATUS, 1);
 537                 rt2x00_set_field32(&reg, INT_MASK_CSR_AUTO_WAKEUP, 1);
 538         }
 539         rt2x00mmio_register_write(rt2x00dev, INT_MASK_CSR, reg);
 540         spin_unlock_irqrestore(&rt2x00dev->irqmask_lock, flags);
 541
 542         if (state == STATE_RADIO_IRQ_OFF) {
 543                 /*
 544                  * Wait for possibly running tasklets to finish.
 545                  */
 546                 tasklet_kill(&rt2x00dev->txstatus_tasklet);
 547                 tasklet_kill(&rt2x00dev->rxdone_tasklet);
 548                 tasklet_kill(&rt2x00dev->autowake_tasklet);
 549                 tasklet_kill(&rt2x00dev->tbtt_tasklet);
 550                 tasklet_kill(&rt2x00dev->pretbtt_tasklet);
 551         }
 552 }
 553 EXPORT_SYMBOL_GPL(rt2800mmio_toggle_irq);
 554
 555 MODULE_AUTHOR(DRV_PROJECT);
 556 MODULE_VERSION(DRV_VERSION);
 557 MODULE_DESCRIPTION("rt2800 MMIO library");
 558 MODULE_LICENSE("GPL");