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, see <http://www.gnu.org/licenses/>.
  23  */
  24
  25 /*      Module: rt2800mmio
  26  *      Abstract: rt2800 MMIO device routines.
  27  */
  28
  29 #include <linux/kernel.h>
  30 #include <linux/module.h>
  31 #include <linux/export.h>
  32
  33 #include "rt2x00.h"
  34 #include "rt2x00mmio.h"
  35 #include "rt2800.h"
  36 #include "rt2800lib.h"
  37 #include "rt2800mmio.h"
  38
  39 /*
  40  * TX descriptor initialization
  41  */
  42 __le32 *rt2800mmio_get_txwi(struct queue_entry *entry)
  43 {
  44         return (__le32 *) entry->skb->data;
  45 }
  46 EXPORT_SYMBOL_GPL(rt2800mmio_get_txwi);
  47
  48 void rt2800mmio_write_tx_desc(struct queue_entry *entry,
  49                               struct txentry_desc *txdesc)
  50 {
  51         struct skb_frame_desc *skbdesc = get_skb_frame_desc(entry->skb);
  52         struct queue_entry_priv_mmio *entry_priv = entry->priv_data;
  53         __le32 *txd = entry_priv->desc;
  54         u32 word;
  55         const unsigned int txwi_size = entry->queue->winfo_size;
  56
  57         /*
  58          * The buffers pointed by SD_PTR0/SD_LEN0 and SD_PTR1/SD_LEN1
  59          * must contains a TXWI structure + 802.11 header + padding + 802.11
  60          * data. We choose to have SD_PTR0/SD_LEN0 only contains TXWI and
  61          * SD_PTR1/SD_LEN1 contains 802.11 header + padding + 802.11
  62          * data. It means that LAST_SEC0 is always 0.
  63          */
  64
  65         /*
  66          * Initialize TX descriptor
  67          */
  68         word = 0;
  69         rt2x00_set_field32(&word, TXD_W0_SD_PTR0, skbdesc->skb_dma);
  70         rt2x00_desc_write(txd, 0, word);
  71
  72         word = 0;
  73         rt2x00_set_field32(&word, TXD_W1_SD_LEN1, entry->skb->len);
  74         rt2x00_set_field32(&word, TXD_W1_LAST_SEC1,
  75                            !test_bit(ENTRY_TXD_MORE_FRAG, &txdesc->flags));
  76         rt2x00_set_field32(&word, TXD_W1_BURST,
  77                            test_bit(ENTRY_TXD_BURST, &txdesc->flags));
  78         rt2x00_set_field32(&word, TXD_W1_SD_LEN0, txwi_size);
  79         rt2x00_set_field32(&word, TXD_W1_LAST_SEC0, 0);
  80         rt2x00_set_field32(&word, TXD_W1_DMA_DONE, 0);
  81         rt2x00_desc_write(txd, 1, word);
  82
  83         word = 0;
  84         rt2x00_set_field32(&word, TXD_W2_SD_PTR1,
  85                            skbdesc->skb_dma + txwi_size);
  86         rt2x00_desc_write(txd, 2, word);
  87
  88         word = 0;
  89         rt2x00_set_field32(&word, TXD_W3_WIV,
  90                            !test_bit(ENTRY_TXD_ENCRYPT_IV, &txdesc->flags));
  91         rt2x00_set_field32(&word, TXD_W3_QSEL, 2);
  92         rt2x00_desc_write(txd, 3, word);
  93
  94         /*
  95          * Register descriptor details in skb frame descriptor.
  96          */
  97         skbdesc->desc = txd;
  98         skbdesc->desc_len = TXD_DESC_SIZE;
  99 }
 100 EXPORT_SYMBOL_GPL(rt2800mmio_write_tx_desc);
 101
 102 /*
 103  * RX control handlers
 104  */
 105 void rt2800mmio_fill_rxdone(struct queue_entry *entry,
 106                             struct rxdone_entry_desc *rxdesc)
 107 {
 108         struct queue_entry_priv_mmio *entry_priv = entry->priv_data;
 109         __le32 *rxd = entry_priv->desc;
 110         u32 word;
 111
 112         rt2x00_desc_read(rxd, 3, &word);
 113
 114         if (rt2x00_get_field32(word, RXD_W3_CRC_ERROR))
 115                 rxdesc->flags |= RX_FLAG_FAILED_FCS_CRC;
 116
 117         /*
 118          * Unfortunately we don't know the cipher type used during
 119          * decryption. This prevents us from correct providing
 120          * correct statistics through debugfs.
 121          */
 122         rxdesc->cipher_status = rt2x00_get_field32(word, RXD_W3_CIPHER_ERROR);
 123
 124         if (rt2x00_get_field32(word, RXD_W3_DECRYPTED)) {
 125                 /*
 126                  * Hardware has stripped IV/EIV data from 802.11 frame during
 127                  * decryption. Unfortunately the descriptor doesn't contain
 128                  * any fields with the EIV/IV data either, so they can't
 129                  * be restored by rt2x00lib.
 130                  */
 131                 rxdesc->flags |= RX_FLAG_IV_STRIPPED;
 132
 133                 /*
 134                  * The hardware has already checked the Michael Mic and has
 135                  * stripped it from the frame. Signal this to mac80211.
 136                  */
 137                 rxdesc->flags |= RX_FLAG_MMIC_STRIPPED;
 138
 139                 if (rxdesc->cipher_status == RX_CRYPTO_SUCCESS)
 140                         rxdesc->flags |= RX_FLAG_DECRYPTED;
 141                 else if (rxdesc->cipher_status == RX_CRYPTO_FAIL_MIC)
 142                         rxdesc->flags |= RX_FLAG_MMIC_ERROR;
 143         }
 144
 145         if (rt2x00_get_field32(word, RXD_W3_MY_BSS))
 146                 rxdesc->dev_flags |= RXDONE_MY_BSS;
 147
 148         if (rt2x00_get_field32(word, RXD_W3_L2PAD))
 149                 rxdesc->dev_flags |= RXDONE_L2PAD;
 150
 151         /*
 152          * Process the RXWI structure that is at the start of the buffer.
 153          */
 154         rt2800_process_rxwi(entry, rxdesc);
 155 }
 156 EXPORT_SYMBOL_GPL(rt2800mmio_fill_rxdone);
 157
 158 /*
 159  * Interrupt functions.
 160  */
 161 static void rt2800mmio_wakeup(struct rt2x00_dev *rt2x00dev)
 162 {
 163         struct ieee80211_conf conf = { .flags = 0 };
 164         struct rt2x00lib_conf libconf = { .conf = &conf };
 165
 166         rt2800_config(rt2x00dev, &libconf, IEEE80211_CONF_CHANGE_PS);
 167 }
 168
 169 static bool rt2800mmio_txdone_entry_check(struct queue_entry *entry, u32 status)
 170 {
 171         __le32 *txwi;
 172         u32 word;
 173         int wcid, tx_wcid;
 174
 175         wcid = rt2x00_get_field32(status, TX_STA_FIFO_WCID);
 176
 177         txwi = rt2800_drv_get_txwi(entry);
 178         rt2x00_desc_read(txwi, 1, &word);
 179         tx_wcid = rt2x00_get_field32(word, TXWI_W1_WIRELESS_CLI_ID);
 180
 181         return (tx_wcid == wcid);
 182 }
 183
 184 static bool rt2800mmio_txdone_find_entry(struct queue_entry *entry, void *data)
 185 {
 186         u32 status = *(u32 *)data;
 187
 188         /*
 189          * rt2800pci hardware might reorder frames when exchanging traffic
 190          * with multiple BA enabled STAs.
 191          *
 192          * For example, a tx queue
 193          *    [ STA1 | STA2 | STA1 | STA2 ]
 194          * can result in tx status reports
 195          *    [ STA1 | STA1 | STA2 | STA2 ]
 196          * when the hw decides to aggregate the frames for STA1 into one AMPDU.
 197          *
 198          * To mitigate this effect, associate the tx status to the first frame
 199          * in the tx queue with a matching wcid.
 200          */
 201         if (rt2800mmio_txdone_entry_check(entry, status) &&
 202             !test_bit(ENTRY_DATA_STATUS_SET, &entry->flags)) {
 203                 /*
 204                  * Got a matching frame, associate the tx status with
 205                  * the frame
 206                  */
 207                 entry->status = status;
 208                 set_bit(ENTRY_DATA_STATUS_SET, &entry->flags);
 209                 return true;
 210         }
 211
 212         /* Check the next frame */
 213         return false;
 214 }
 215
 216 static bool rt2800mmio_txdone_match_first(struct queue_entry *entry, void *data)
 217 {
 218         u32 status = *(u32 *)data;
 219
 220         /*
 221          * Find the first frame without tx status and assign this status to it
 222          * regardless if it matches or not.
 223          */
 224         if (!test_bit(ENTRY_DATA_STATUS_SET, &entry->flags)) {
 225                 /*
 226                  * Got a matching frame, associate the tx status with
 227                  * the frame
 228                  */
 229                 entry->status = status;
 230                 set_bit(ENTRY_DATA_STATUS_SET, &entry->flags);
 231                 return true;
 232         }
 233
 234         /* Check the next frame */
 235         return false;
 236 }
 237 static bool rt2800mmio_txdone_release_entries(struct queue_entry *entry,
 238                                               void *data)
 239 {
 240         if (test_bit(ENTRY_DATA_STATUS_SET, &entry->flags)) {
 241                 rt2800_txdone_entry(entry, entry->status,
 242                                     rt2800mmio_get_txwi(entry));
 243                 return false;
 244         }
 245
 246         /* No more frames to release */
 247         return true;
 248 }
 249
 250 static bool rt2800mmio_txdone(struct rt2x00_dev *rt2x00dev)
 251 {
 252         struct data_queue *queue;
 253         u32 status;
 254         u8 qid;
 255         int max_tx_done = 16;
 256
 257         while (kfifo_get(&rt2x00dev->txstatus_fifo, &status)) {
 258                 qid = rt2x00_get_field32(status, TX_STA_FIFO_PID_QUEUE);
 259                 if (unlikely(qid >= QID_RX)) {
 260                         /*
 261                          * Unknown queue, this shouldn't happen. Just drop
 262                          * this tx status.
 263                          */
 264                         rt2x00_warn(rt2x00dev, "Got TX status report with unexpected pid %u, dropping\n",
 265                                     qid);
 266                         break;
 267                 }
 268
 269                 queue = rt2x00queue_get_tx_queue(rt2x00dev, qid);
 270                 if (unlikely(queue == NULL)) {
 271                         /*
 272                          * The queue is NULL, this shouldn't happen. Stop
 273                          * processing here and drop the tx status
 274                          */
 275                         rt2x00_warn(rt2x00dev, "Got TX status for an unavailable queue %u, dropping\n",
 276                                     qid);
 277                         break;
 278                 }
 279
 280                 if (unlikely(rt2x00queue_empty(queue))) {
 281                         /*
 282                          * The queue is empty. Stop processing here
 283                          * and drop the tx status.
 284                          */
 285                         rt2x00_warn(rt2x00dev, "Got TX status for an empty queue %u, dropping\n",
 286                                     qid);
 287                         break;
 288                 }
 289
 290                 /*
 291                  * Let's associate this tx status with the first
 292                  * matching frame.
 293                  */
 294                 if (!rt2x00queue_for_each_entry(queue, Q_INDEX_DONE,
 295                                                 Q_INDEX, &status,
 296                                                 rt2800mmio_txdone_find_entry)) {
 297                         /*
 298                          * We cannot match the tx status to any frame, so just
 299                          * use the first one.
 300                          */
 301                         if (!rt2x00queue_for_each_entry(queue, Q_INDEX_DONE,
 302                                                         Q_INDEX, &status,
 303                                                         rt2800mmio_txdone_match_first)) {
 304                                 rt2x00_warn(rt2x00dev, "No frame found for TX status on queue %u, dropping\n",
 305                                             qid);
 306                                 break;
 307                         }
 308                 }
 309
 310                 /*
 311                  * Release all frames with a valid tx status.
 312                  */
 313                 rt2x00queue_for_each_entry(queue, Q_INDEX_DONE,
 314                                            Q_INDEX, NULL,
 315                                            rt2800mmio_txdone_release_entries);
 316
 317                 if (--max_tx_done == 0)
 318                         break;
 319         }
 320
 321         return !max_tx_done;
 322 }
 323
 324 static inline void rt2800mmio_enable_interrupt(struct rt2x00_dev *rt2x00dev,
 325                                                struct rt2x00_field32 irq_field)
 326 {
 327         u32 reg;
 328
 329         /*
 330          * Enable a single interrupt. The interrupt mask register
 331          * access needs locking.
 332          */
 333         spin_lock_irq(&rt2x00dev->irqmask_lock);
 334         rt2x00mmio_register_read(rt2x00dev, INT_MASK_CSR, &reg);
 335         rt2x00_set_field32(&reg, irq_field, 1);
 336         rt2x00mmio_register_write(rt2x00dev, INT_MASK_CSR, reg);
 337         spin_unlock_irq(&rt2x00dev->irqmask_lock);
 338 }
 339
 340 void rt2800mmio_txstatus_tasklet(unsigned long data)
 341 {
 342         struct rt2x00_dev *rt2x00dev = (struct rt2x00_dev *)data;
 343         if (rt2800mmio_txdone(rt2x00dev))
 344                 tasklet_schedule(&rt2x00dev->txstatus_tasklet);
 345
 346         /*
 347          * No need to enable the tx status interrupt here as we always
 348          * leave it enabled to minimize the possibility of a tx status
 349          * register overflow. See comment in interrupt handler.
 350          */
 351 }
 352 EXPORT_SYMBOL_GPL(rt2800mmio_txstatus_tasklet);
 353
 354 void rt2800mmio_pretbtt_tasklet(unsigned long data)
 355 {
 356         struct rt2x00_dev *rt2x00dev = (struct rt2x00_dev *)data;
 357         rt2x00lib_pretbtt(rt2x00dev);
 358         if (test_bit(DEVICE_STATE_ENABLED_RADIO, &rt2x00dev->flags))
 359                 rt2800mmio_enable_interrupt(rt2x00dev, INT_MASK_CSR_PRE_TBTT);
 360 }
 361 EXPORT_SYMBOL_GPL(rt2800mmio_pretbtt_tasklet);
 362
 363 void rt2800mmio_tbtt_tasklet(unsigned long data)
 364 {
 365         struct rt2x00_dev *rt2x00dev = (struct rt2x00_dev *)data;
 366         struct rt2800_drv_data *drv_data = rt2x00dev->drv_data;
 367         u32 reg;
 368
 369         rt2x00lib_beacondone(rt2x00dev);
 370
 371         if (rt2x00dev->intf_ap_count) {
 372                 /*
 373                  * The rt2800pci hardware tbtt timer is off by 1us per tbtt
 374                  * causing beacon skew and as a result causing problems with
 375                  * some powersaving clients over time. Shorten the beacon
 376                  * interval every 64 beacons by 64us to mitigate this effect.
 377                  */
 378                 if (drv_data->tbtt_tick == (BCN_TBTT_OFFSET - 2)) {
 379                         rt2x00mmio_register_read(rt2x00dev, BCN_TIME_CFG, &reg);
 380                         rt2x00_set_field32(&reg, BCN_TIME_CFG_BEACON_INTERVAL,
 381                                            (rt2x00dev->beacon_int * 16) - 1);
 382                         rt2x00mmio_register_write(rt2x00dev, BCN_TIME_CFG, reg);
 383                 } else if (drv_data->tbtt_tick == (BCN_TBTT_OFFSET - 1)) {
 384                         rt2x00mmio_register_read(rt2x00dev, BCN_TIME_CFG, &reg);
 385                         rt2x00_set_field32(&reg, BCN_TIME_CFG_BEACON_INTERVAL,
 386                                            (rt2x00dev->beacon_int * 16));
 387                         rt2x00mmio_register_write(rt2x00dev, BCN_TIME_CFG, reg);
 388                 }
 389                 drv_data->tbtt_tick++;
 390                 drv_data->tbtt_tick %= BCN_TBTT_OFFSET;
 391         }
 392
 393         if (test_bit(DEVICE_STATE_ENABLED_RADIO, &rt2x00dev->flags))
 394                 rt2800mmio_enable_interrupt(rt2x00dev, INT_MASK_CSR_TBTT);
 395 }
 396 EXPORT_SYMBOL_GPL(rt2800mmio_tbtt_tasklet);
 397
 398 void rt2800mmio_rxdone_tasklet(unsigned long data)
 399 {
 400         struct rt2x00_dev *rt2x00dev = (struct rt2x00_dev *)data;
 401         if (rt2x00mmio_rxdone(rt2x00dev))
 402                 tasklet_schedule(&rt2x00dev->rxdone_tasklet);
 403         else if (test_bit(DEVICE_STATE_ENABLED_RADIO, &rt2x00dev->flags))
 404                 rt2800mmio_enable_interrupt(rt2x00dev, INT_MASK_CSR_RX_DONE);
 405 }
 406 EXPORT_SYMBOL_GPL(rt2800mmio_rxdone_tasklet);
 407
 408 void rt2800mmio_autowake_tasklet(unsigned long data)
 409 {
 410         struct rt2x00_dev *rt2x00dev = (struct rt2x00_dev *)data;
 411         rt2800mmio_wakeup(rt2x00dev);
 412         if (test_bit(DEVICE_STATE_ENABLED_RADIO, &rt2x00dev->flags))
 413                 rt2800mmio_enable_interrupt(rt2x00dev,
 414                                             INT_MASK_CSR_AUTO_WAKEUP);
 415 }
 416 EXPORT_SYMBOL_GPL(rt2800mmio_autowake_tasklet);
 417
 418 static void rt2800mmio_txstatus_interrupt(struct rt2x00_dev *rt2x00dev)
 419 {
 420         u32 status;
 421         int i;
 422
 423         /*
 424          * The TX_FIFO_STATUS interrupt needs special care. We should
 425          * read TX_STA_FIFO but we should do it immediately as otherwise
 426          * the register can overflow and we would lose status reports.
 427          *
 428          * Hence, read the TX_STA_FIFO register and copy all tx status
 429          * reports into a kernel FIFO which is handled in the txstatus
 430          * tasklet. We use a tasklet to process the tx status reports
 431          * because we can schedule the tasklet multiple times (when the
 432          * interrupt fires again during tx status processing).
 433          *
 434          * Furthermore we don't disable the TX_FIFO_STATUS
 435          * interrupt here but leave it enabled so that the TX_STA_FIFO
 436          * can also be read while the tx status tasklet gets executed.
 437          *
 438          * Since we have only one producer and one consumer we don't
 439          * need to lock the kfifo.
 440          */
 441         for (i = 0; i < rt2x00dev->tx->limit; i++) {
 442                 rt2x00mmio_register_read(rt2x00dev, TX_STA_FIFO, &status);
 443
 444                 if (!rt2x00_get_field32(status, TX_STA_FIFO_VALID))
 445                         break;
 446
 447                 if (!kfifo_put(&rt2x00dev->txstatus_fifo, status)) {
 448                         rt2x00_warn(rt2x00dev, "TX status FIFO overrun, drop tx status report\n");
 449                         break;
 450                 }
 451         }
 452
 453         /* Schedule the tasklet for processing the tx status. */
 454         tasklet_schedule(&rt2x00dev->txstatus_tasklet);
 455 }
 456
 457 irqreturn_t rt2800mmio_interrupt(int irq, void *dev_instance)
 458 {
 459         struct rt2x00_dev *rt2x00dev = dev_instance;
 460         u32 reg, mask;
 461
 462         /* Read status and ACK all interrupts */
 463         rt2x00mmio_register_read(rt2x00dev, INT_SOURCE_CSR, &reg);
 464         rt2x00mmio_register_write(rt2x00dev, INT_SOURCE_CSR, reg);
 465
 466         if (!reg)
 467                 return IRQ_NONE;
 468
 469         if (!test_bit(DEVICE_STATE_ENABLED_RADIO, &rt2x00dev->flags))
 470                 return IRQ_HANDLED;
 471
 472         /*
 473          * Since INT_MASK_CSR and INT_SOURCE_CSR use the same bits
 474          * for interrupts and interrupt masks we can just use the value of
 475          * INT_SOURCE_CSR to create the interrupt mask.
 476          */
 477         mask = ~reg;
 478
 479         if (rt2x00_get_field32(reg, INT_SOURCE_CSR_TX_FIFO_STATUS)) {
 480                 rt2800mmio_txstatus_interrupt(rt2x00dev);
 481                 /*
 482                  * Never disable the TX_FIFO_STATUS interrupt.
 483                  */
 484                 rt2x00_set_field32(&mask, INT_MASK_CSR_TX_FIFO_STATUS, 1);
 485         }
 486
 487         if (rt2x00_get_field32(reg, INT_SOURCE_CSR_PRE_TBTT))
 488                 tasklet_hi_schedule(&rt2x00dev->pretbtt_tasklet);
 489
 490         if (rt2x00_get_field32(reg, INT_SOURCE_CSR_TBTT))
 491                 tasklet_hi_schedule(&rt2x00dev->tbtt_tasklet);
 492
 493         if (rt2x00_get_field32(reg, INT_SOURCE_CSR_RX_DONE))
 494                 tasklet_schedule(&rt2x00dev->rxdone_tasklet);
 495
 496         if (rt2x00_get_field32(reg, INT_SOURCE_CSR_AUTO_WAKEUP))
 497                 tasklet_schedule(&rt2x00dev->autowake_tasklet);
 498
 499         /*
 500          * Disable all interrupts for which a tasklet was scheduled right now,
 501          * the tasklet will reenable the appropriate interrupts.
 502          */
 503         spin_lock(&rt2x00dev->irqmask_lock);
 504         rt2x00mmio_register_read(rt2x00dev, INT_MASK_CSR, &reg);
 505         reg &= mask;
 506         rt2x00mmio_register_write(rt2x00dev, INT_MASK_CSR, reg);
 507         spin_unlock(&rt2x00dev->irqmask_lock);
 508
 509         return IRQ_HANDLED;
 510 }
 511 EXPORT_SYMBOL_GPL(rt2800mmio_interrupt);
 512
 513 void rt2800mmio_toggle_irq(struct rt2x00_dev *rt2x00dev,
 514                            enum dev_state state)
 515 {
 516         u32 reg;
 517         unsigned long flags;
 518
 519         /*
 520          * When interrupts are being enabled, the interrupt registers
 521          * should clear the register to assure a clean state.
 522          */
 523         if (state == STATE_RADIO_IRQ_ON) {
 524                 rt2x00mmio_register_read(rt2x00dev, INT_SOURCE_CSR, &reg);
 525                 rt2x00mmio_register_write(rt2x00dev, INT_SOURCE_CSR, reg);
 526         }
 527
 528         spin_lock_irqsave(&rt2x00dev->irqmask_lock, flags);
 529         reg = 0;
 530         if (state == STATE_RADIO_IRQ_ON) {
 531                 rt2x00_set_field32(&reg, INT_MASK_CSR_RX_DONE, 1);
 532                 rt2x00_set_field32(&reg, INT_MASK_CSR_TBTT, 1);
 533                 rt2x00_set_field32(&reg, INT_MASK_CSR_PRE_TBTT, 1);
 534                 rt2x00_set_field32(&reg, INT_MASK_CSR_TX_FIFO_STATUS, 1);
 535                 rt2x00_set_field32(&reg, INT_MASK_CSR_AUTO_WAKEUP, 1);
 536         }
 537         rt2x00mmio_register_write(rt2x00dev, INT_MASK_CSR, reg);
 538         spin_unlock_irqrestore(&rt2x00dev->irqmask_lock, flags);
 539
 540         if (state == STATE_RADIO_IRQ_OFF) {
 541                 /*
 542                  * Wait for possibly running tasklets to finish.
 543                  */
 544                 tasklet_kill(&rt2x00dev->txstatus_tasklet);
 545                 tasklet_kill(&rt2x00dev->rxdone_tasklet);
 546                 tasklet_kill(&rt2x00dev->autowake_tasklet);
 547                 tasklet_kill(&rt2x00dev->tbtt_tasklet);
 548                 tasklet_kill(&rt2x00dev->pretbtt_tasklet);
 549         }
 550 }
 551 EXPORT_SYMBOL_GPL(rt2800mmio_toggle_irq);
 552
 553 /*
 554  * Queue handlers.
 555  */
 556 void rt2800mmio_start_queue(struct data_queue *queue)
 557 {
 558         struct rt2x00_dev *rt2x00dev = queue->rt2x00dev;
 559         u32 reg;
 560
 561         switch (queue->qid) {
 562         case QID_RX:
 563                 rt2x00mmio_register_read(rt2x00dev, MAC_SYS_CTRL, &reg);
 564                 rt2x00_set_field32(&reg, MAC_SYS_CTRL_ENABLE_RX, 1);
 565                 rt2x00mmio_register_write(rt2x00dev, MAC_SYS_CTRL, reg);
 566                 break;
 567         case QID_BEACON:
 568                 rt2x00mmio_register_read(rt2x00dev, BCN_TIME_CFG, &reg);
 569                 rt2x00_set_field32(&reg, BCN_TIME_CFG_TSF_TICKING, 1);
 570                 rt2x00_set_field32(&reg, BCN_TIME_CFG_TBTT_ENABLE, 1);
 571                 rt2x00_set_field32(&reg, BCN_TIME_CFG_BEACON_GEN, 1);
 572                 rt2x00mmio_register_write(rt2x00dev, BCN_TIME_CFG, reg);
 573
 574                 rt2x00mmio_register_read(rt2x00dev, INT_TIMER_EN, &reg);
 575                 rt2x00_set_field32(&reg, INT_TIMER_EN_PRE_TBTT_TIMER, 1);
 576                 rt2x00mmio_register_write(rt2x00dev, INT_TIMER_EN, reg);
 577                 break;
 578         default:
 579                 break;
 580         }
 581 }
 582 EXPORT_SYMBOL_GPL(rt2800mmio_start_queue);
 583
 584 void rt2800mmio_kick_queue(struct data_queue *queue)
 585 {
 586         struct rt2x00_dev *rt2x00dev = queue->rt2x00dev;
 587         struct queue_entry *entry;
 588
 589         switch (queue->qid) {
 590         case QID_AC_VO:
 591         case QID_AC_VI:
 592         case QID_AC_BE:
 593         case QID_AC_BK:
 594                 entry = rt2x00queue_get_entry(queue, Q_INDEX);
 595                 rt2x00mmio_register_write(rt2x00dev, TX_CTX_IDX(queue->qid),
 596                                           entry->entry_idx);
 597                 break;
 598         case QID_MGMT:
 599                 entry = rt2x00queue_get_entry(queue, Q_INDEX);
 600                 rt2x00mmio_register_write(rt2x00dev, TX_CTX_IDX(5),
 601                                           entry->entry_idx);
 602                 break;
 603         default:
 604                 break;
 605         }
 606 }
 607 EXPORT_SYMBOL_GPL(rt2800mmio_kick_queue);
 608
 609 void rt2800mmio_stop_queue(struct data_queue *queue)
 610 {
 611         struct rt2x00_dev *rt2x00dev = queue->rt2x00dev;
 612         u32 reg;
 613
 614         switch (queue->qid) {
 615         case QID_RX:
 616                 rt2x00mmio_register_read(rt2x00dev, MAC_SYS_CTRL, &reg);
 617                 rt2x00_set_field32(&reg, MAC_SYS_CTRL_ENABLE_RX, 0);
 618                 rt2x00mmio_register_write(rt2x00dev, MAC_SYS_CTRL, reg);
 619                 break;
 620         case QID_BEACON:
 621                 rt2x00mmio_register_read(rt2x00dev, BCN_TIME_CFG, &reg);
 622                 rt2x00_set_field32(&reg, BCN_TIME_CFG_TSF_TICKING, 0);
 623                 rt2x00_set_field32(&reg, BCN_TIME_CFG_TBTT_ENABLE, 0);
 624                 rt2x00_set_field32(&reg, BCN_TIME_CFG_BEACON_GEN, 0);
 625                 rt2x00mmio_register_write(rt2x00dev, BCN_TIME_CFG, reg);
 626
 627                 rt2x00mmio_register_read(rt2x00dev, INT_TIMER_EN, &reg);
 628                 rt2x00_set_field32(&reg, INT_TIMER_EN_PRE_TBTT_TIMER, 0);
 629                 rt2x00mmio_register_write(rt2x00dev, INT_TIMER_EN, reg);
 630
 631                 /*
 632                  * Wait for current invocation to finish. The tasklet
 633                  * won't be scheduled anymore afterwards since we disabled
 634                  * the TBTT and PRE TBTT timer.
 635                  */
 636                 tasklet_kill(&rt2x00dev->tbtt_tasklet);
 637                 tasklet_kill(&rt2x00dev->pretbtt_tasklet);
 638
 639                 break;
 640         default:
 641                 break;
 642         }
 643 }
 644 EXPORT_SYMBOL_GPL(rt2800mmio_stop_queue);
 645
 646 void rt2800mmio_queue_init(struct data_queue *queue)
 647 {
 648         struct rt2x00_dev *rt2x00dev = queue->rt2x00dev;
 649         unsigned short txwi_size, rxwi_size;
 650
 651         rt2800_get_txwi_rxwi_size(rt2x00dev, &txwi_size, &rxwi_size);
 652
 653         switch (queue->qid) {
 654         case QID_RX:
 655                 queue->limit = 128;
 656                 queue->data_size = AGGREGATION_SIZE;
 657                 queue->desc_size = RXD_DESC_SIZE;
 658                 queue->winfo_size = rxwi_size;
 659                 queue->priv_size = sizeof(struct queue_entry_priv_mmio);
 660                 break;
 661
 662         case QID_AC_VO:
 663         case QID_AC_VI:
 664         case QID_AC_BE:
 665         case QID_AC_BK:
 666                 queue->limit = 64;
 667                 queue->data_size = AGGREGATION_SIZE;
 668                 queue->desc_size = TXD_DESC_SIZE;
 669                 queue->winfo_size = txwi_size;
 670                 queue->priv_size = sizeof(struct queue_entry_priv_mmio);
 671                 break;
 672
 673         case QID_BEACON:
 674                 queue->limit = 8;
 675                 queue->data_size = 0; /* No DMA required for beacons */
 676                 queue->desc_size = TXD_DESC_SIZE;
 677                 queue->winfo_size = txwi_size;
 678                 queue->priv_size = sizeof(struct queue_entry_priv_mmio);
 679                 break;
 680
 681         case QID_ATIM:
 682                 /* fallthrough */
 683         default:
 684                 BUG();
 685                 break;
 686         }
 687 }
 688 EXPORT_SYMBOL_GPL(rt2800mmio_queue_init);
 689
 690 /*
 691  * Initialization functions.
 692  */
 693 bool rt2800mmio_get_entry_state(struct queue_entry *entry)
 694 {
 695         struct queue_entry_priv_mmio *entry_priv = entry->priv_data;
 696         u32 word;
 697
 698         if (entry->queue->qid == QID_RX) {
 699                 rt2x00_desc_read(entry_priv->desc, 1, &word);
 700
 701                 return (!rt2x00_get_field32(word, RXD_W1_DMA_DONE));
 702         } else {
 703                 rt2x00_desc_read(entry_priv->desc, 1, &word);
 704
 705                 return (!rt2x00_get_field32(word, TXD_W1_DMA_DONE));
 706         }
 707 }
 708 EXPORT_SYMBOL_GPL(rt2800mmio_get_entry_state);
 709
 710 void rt2800mmio_clear_entry(struct queue_entry *entry)
 711 {
 712         struct queue_entry_priv_mmio *entry_priv = entry->priv_data;
 713         struct skb_frame_desc *skbdesc = get_skb_frame_desc(entry->skb);
 714         struct rt2x00_dev *rt2x00dev = entry->queue->rt2x00dev;
 715         u32 word;
 716
 717         if (entry->queue->qid == QID_RX) {
 718                 rt2x00_desc_read(entry_priv->desc, 0, &word);
 719                 rt2x00_set_field32(&word, RXD_W0_SDP0, skbdesc->skb_dma);
 720                 rt2x00_desc_write(entry_priv->desc, 0, word);
 721
 722                 rt2x00_desc_read(entry_priv->desc, 1, &word);
 723                 rt2x00_set_field32(&word, RXD_W1_DMA_DONE, 0);
 724                 rt2x00_desc_write(entry_priv->desc, 1, word);
 725
 726                 /*
 727                  * Set RX IDX in register to inform hardware that we have
 728                  * handled this entry and it is available for reuse again.
 729                  */
 730                 rt2x00mmio_register_write(rt2x00dev, RX_CRX_IDX,
 731                                           entry->entry_idx);
 732         } else {
 733                 rt2x00_desc_read(entry_priv->desc, 1, &word);
 734                 rt2x00_set_field32(&word, TXD_W1_DMA_DONE, 1);
 735                 rt2x00_desc_write(entry_priv->desc, 1, word);
 736         }
 737 }
 738 EXPORT_SYMBOL_GPL(rt2800mmio_clear_entry);
 739
 740 int rt2800mmio_init_queues(struct rt2x00_dev *rt2x00dev)
 741 {
 742         struct queue_entry_priv_mmio *entry_priv;
 743
 744         /*
 745          * Initialize registers.
 746          */
 747         entry_priv = rt2x00dev->tx[0].entries[0].priv_data;
 748         rt2x00mmio_register_write(rt2x00dev, TX_BASE_PTR0,
 749                                   entry_priv->desc_dma);
 750         rt2x00mmio_register_write(rt2x00dev, TX_MAX_CNT0,
 751                                   rt2x00dev->tx[0].limit);
 752         rt2x00mmio_register_write(rt2x00dev, TX_CTX_IDX0, 0);
 753         rt2x00mmio_register_write(rt2x00dev, TX_DTX_IDX0, 0);
 754
 755         entry_priv = rt2x00dev->tx[1].entries[0].priv_data;
 756         rt2x00mmio_register_write(rt2x00dev, TX_BASE_PTR1,
 757                                   entry_priv->desc_dma);
 758         rt2x00mmio_register_write(rt2x00dev, TX_MAX_CNT1,
 759                                   rt2x00dev->tx[1].limit);
 760         rt2x00mmio_register_write(rt2x00dev, TX_CTX_IDX1, 0);
 761         rt2x00mmio_register_write(rt2x00dev, TX_DTX_IDX1, 0);
 762
 763         entry_priv = rt2x00dev->tx[2].entries[0].priv_data;
 764         rt2x00mmio_register_write(rt2x00dev, TX_BASE_PTR2,
 765                                   entry_priv->desc_dma);
 766         rt2x00mmio_register_write(rt2x00dev, TX_MAX_CNT2,
 767                                   rt2x00dev->tx[2].limit);
 768         rt2x00mmio_register_write(rt2x00dev, TX_CTX_IDX2, 0);
 769         rt2x00mmio_register_write(rt2x00dev, TX_DTX_IDX2, 0);
 770
 771         entry_priv = rt2x00dev->tx[3].entries[0].priv_data;
 772         rt2x00mmio_register_write(rt2x00dev, TX_BASE_PTR3,
 773                                   entry_priv->desc_dma);
 774         rt2x00mmio_register_write(rt2x00dev, TX_MAX_CNT3,
 775                                   rt2x00dev->tx[3].limit);
 776         rt2x00mmio_register_write(rt2x00dev, TX_CTX_IDX3, 0);
 777         rt2x00mmio_register_write(rt2x00dev, TX_DTX_IDX3, 0);
 778
 779         rt2x00mmio_register_write(rt2x00dev, TX_BASE_PTR4, 0);
 780         rt2x00mmio_register_write(rt2x00dev, TX_MAX_CNT4, 0);
 781         rt2x00mmio_register_write(rt2x00dev, TX_CTX_IDX4, 0);
 782         rt2x00mmio_register_write(rt2x00dev, TX_DTX_IDX4, 0);
 783
 784         rt2x00mmio_register_write(rt2x00dev, TX_BASE_PTR5, 0);
 785         rt2x00mmio_register_write(rt2x00dev, TX_MAX_CNT5, 0);
 786         rt2x00mmio_register_write(rt2x00dev, TX_CTX_IDX5, 0);
 787         rt2x00mmio_register_write(rt2x00dev, TX_DTX_IDX5, 0);
 788
 789         entry_priv = rt2x00dev->rx->entries[0].priv_data;
 790         rt2x00mmio_register_write(rt2x00dev, RX_BASE_PTR,
 791                                   entry_priv->desc_dma);
 792         rt2x00mmio_register_write(rt2x00dev, RX_MAX_CNT,
 793                                   rt2x00dev->rx[0].limit);
 794         rt2x00mmio_register_write(rt2x00dev, RX_CRX_IDX,
 795                                   rt2x00dev->rx[0].limit - 1);
 796         rt2x00mmio_register_write(rt2x00dev, RX_DRX_IDX, 0);
 797
 798         rt2800_disable_wpdma(rt2x00dev);
 799
 800         rt2x00mmio_register_write(rt2x00dev, DELAY_INT_CFG, 0);
 801
 802         return 0;
 803 }
 804 EXPORT_SYMBOL_GPL(rt2800mmio_init_queues);
 805
 806 int rt2800mmio_init_registers(struct rt2x00_dev *rt2x00dev)
 807 {
 808         u32 reg;
 809
 810         /*
 811          * Reset DMA indexes
 812          */
 813         rt2x00mmio_register_read(rt2x00dev, WPDMA_RST_IDX, &reg);
 814         rt2x00_set_field32(&reg, WPDMA_RST_IDX_DTX_IDX0, 1);
 815         rt2x00_set_field32(&reg, WPDMA_RST_IDX_DTX_IDX1, 1);
 816         rt2x00_set_field32(&reg, WPDMA_RST_IDX_DTX_IDX2, 1);
 817         rt2x00_set_field32(&reg, WPDMA_RST_IDX_DTX_IDX3, 1);
 818         rt2x00_set_field32(&reg, WPDMA_RST_IDX_DTX_IDX4, 1);
 819         rt2x00_set_field32(&reg, WPDMA_RST_IDX_DTX_IDX5, 1);
 820         rt2x00_set_field32(&reg, WPDMA_RST_IDX_DRX_IDX0, 1);
 821         rt2x00mmio_register_write(rt2x00dev, WPDMA_RST_IDX, reg);
 822
 823         rt2x00mmio_register_write(rt2x00dev, PBF_SYS_CTRL, 0x00000e1f);
 824         rt2x00mmio_register_write(rt2x00dev, PBF_SYS_CTRL, 0x00000e00);
 825
 826         if (rt2x00_is_pcie(rt2x00dev) &&
 827             (rt2x00_rt(rt2x00dev, RT3090) ||
 828              rt2x00_rt(rt2x00dev, RT3390) ||
 829              rt2x00_rt(rt2x00dev, RT3572) ||
 830              rt2x00_rt(rt2x00dev, RT3593) ||
 831              rt2x00_rt(rt2x00dev, RT5390) ||
 832              rt2x00_rt(rt2x00dev, RT5392) ||
 833              rt2x00_rt(rt2x00dev, RT5592))) {
 834                 rt2x00mmio_register_read(rt2x00dev, AUX_CTRL, &reg);
 835                 rt2x00_set_field32(&reg, AUX_CTRL_FORCE_PCIE_CLK, 1);
 836                 rt2x00_set_field32(&reg, AUX_CTRL_WAKE_PCIE_EN, 1);
 837                 rt2x00mmio_register_write(rt2x00dev, AUX_CTRL, reg);
 838         }
 839
 840         rt2x00mmio_register_write(rt2x00dev, PWR_PIN_CFG, 0x00000003);
 841
 842         reg = 0;
 843         rt2x00_set_field32(&reg, MAC_SYS_CTRL_RESET_CSR, 1);
 844         rt2x00_set_field32(&reg, MAC_SYS_CTRL_RESET_BBP, 1);
 845         rt2x00mmio_register_write(rt2x00dev, MAC_SYS_CTRL, reg);
 846
 847         rt2x00mmio_register_write(rt2x00dev, MAC_SYS_CTRL, 0x00000000);
 848
 849         return 0;
 850 }
 851 EXPORT_SYMBOL_GPL(rt2800mmio_init_registers);
 852
 853 /*
 854  * Device state switch handlers.
 855  */
 856 int rt2800mmio_enable_radio(struct rt2x00_dev *rt2x00dev)
 857 {
 858         /* Wait for DMA, ignore error until we initialize queues. */
 859         rt2800_wait_wpdma_ready(rt2x00dev);
 860
 861         if (unlikely(rt2800mmio_init_queues(rt2x00dev)))
 862                 return -EIO;
 863
 864         return rt2800_enable_radio(rt2x00dev);
 865 }
 866 EXPORT_SYMBOL_GPL(rt2800mmio_enable_radio);
 867
 868 MODULE_AUTHOR(DRV_PROJECT);
 869 MODULE_VERSION(DRV_VERSION);
 870 MODULE_DESCRIPTION("rt2800 MMIO library");
 871 MODULE_LICENSE("GPL");