drivers/net/wireless/b43legacy/pio.c

   1 /*
   2
   3   Broadcom B43legacy wireless driver
   4
   5   PIO Transmission
   6
   7   Copyright (c) 2005 Michael Buesch <m@bues.ch>
   8
   9   This program is free software; you can redistribute it and/or modify
  10   it under the terms of the GNU General Public License as published by
  11   the Free Software Foundation; either version 2 of the License, or
  12   (at your option) any later version.
  13
  14   This program is distributed in the hope that it will be useful,
  15   but WITHOUT ANY WARRANTY; without even the implied warranty of
  16   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17   GNU General Public License for more details.
  18
  19   You should have received a copy of the GNU General Public License
  20   along with this program; see the file COPYING.  If not, write to
  21   the Free Software Foundation, Inc., 51 Franklin Steet, Fifth Floor,
  22   Boston, MA 02110-1301, USA.
  23
  24 */
  25
  26 #include "b43legacy.h"
  27 #include "pio.h"
  28 #include "main.h"
  29 #include "xmit.h"
  30
  31 #include <linux/delay.h>
  32 #include <linux/slab.h>
  33
  34
  35 static void tx_start(struct b43legacy_pioqueue *queue)
  36 {
  37         b43legacy_pio_write(queue, B43legacy_PIO_TXCTL,
  38                             B43legacy_PIO_TXCTL_INIT);
  39 }
  40
  41 static void tx_octet(struct b43legacy_pioqueue *queue,
  42                      u8 octet)
  43 {
  44         if (queue->need_workarounds) {
  45                 b43legacy_pio_write(queue, B43legacy_PIO_TXDATA, octet);
  46                 b43legacy_pio_write(queue, B43legacy_PIO_TXCTL,
  47                                     B43legacy_PIO_TXCTL_WRITELO);
  48         } else {
  49                 b43legacy_pio_write(queue, B43legacy_PIO_TXCTL,
  50                                     B43legacy_PIO_TXCTL_WRITELO);
  51                 b43legacy_pio_write(queue, B43legacy_PIO_TXDATA, octet);
  52         }
  53 }
  54
  55 static u16 tx_get_next_word(const u8 *txhdr,
  56                             const u8 *packet,
  57                             size_t txhdr_size,
  58                             unsigned int *pos)
  59 {
  60         const u8 *source;
  61         unsigned int i = *pos;
  62         u16 ret;
  63
  64         if (i < txhdr_size)
  65                 source = txhdr;
  66         else {
  67                 source = packet;
  68                 i -= txhdr_size;
  69         }
  70         ret = le16_to_cpu(*((__le16 *)(source + i)));
  71         *pos += 2;
  72
  73         return ret;
  74 }
  75
  76 static void tx_data(struct b43legacy_pioqueue *queue,
  77                     u8 *txhdr,
  78                     const u8 *packet,
  79                     unsigned int octets)
  80 {
  81         u16 data;
  82         unsigned int i = 0;
  83
  84         if (queue->need_workarounds) {
  85                 data = tx_get_next_word(txhdr, packet,
  86                                         sizeof(struct b43legacy_txhdr_fw3), &i);
  87                 b43legacy_pio_write(queue, B43legacy_PIO_TXDATA, data);
  88         }
  89         b43legacy_pio_write(queue, B43legacy_PIO_TXCTL,
  90                             B43legacy_PIO_TXCTL_WRITELO |
  91                             B43legacy_PIO_TXCTL_WRITEHI);
  92         while (i < octets - 1) {
  93                 data = tx_get_next_word(txhdr, packet,
  94                                         sizeof(struct b43legacy_txhdr_fw3), &i);
  95                 b43legacy_pio_write(queue, B43legacy_PIO_TXDATA, data);
  96         }
  97         if (octets % 2)
  98                 tx_octet(queue, packet[octets -
  99                          sizeof(struct b43legacy_txhdr_fw3) - 1]);
 100 }
 101
 102 static void tx_complete(struct b43legacy_pioqueue *queue,
 103                         struct sk_buff *skb)
 104 {
 105         if (queue->need_workarounds) {
 106                 b43legacy_pio_write(queue, B43legacy_PIO_TXDATA,
 107                                     skb->data[skb->len - 1]);
 108                 b43legacy_pio_write(queue, B43legacy_PIO_TXCTL,
 109                                     B43legacy_PIO_TXCTL_WRITELO |
 110                                     B43legacy_PIO_TXCTL_COMPLETE);
 111         } else
 112                 b43legacy_pio_write(queue, B43legacy_PIO_TXCTL,
 113                                     B43legacy_PIO_TXCTL_COMPLETE);
 114 }
 115
 116 static u16 generate_cookie(struct b43legacy_pioqueue *queue,
 117                            struct b43legacy_pio_txpacket *packet)
 118 {
 119         u16 cookie = 0x0000;
 120         int packetindex;
 121
 122         /* We use the upper 4 bits for the PIO
 123          * controller ID and the lower 12 bits
 124          * for the packet index (in the cache).
 125          */
 126         switch (queue->mmio_base) {
 127         case B43legacy_MMIO_PIO1_BASE:
 128                 break;
 129         case B43legacy_MMIO_PIO2_BASE:
 130                 cookie = 0x1000;
 131                 break;
 132         case B43legacy_MMIO_PIO3_BASE:
 133                 cookie = 0x2000;
 134                 break;
 135         case B43legacy_MMIO_PIO4_BASE:
 136                 cookie = 0x3000;
 137                 break;
 138         default:
 139                 B43legacy_WARN_ON(1);
 140         }
 141         packetindex = pio_txpacket_getindex(packet);
 142         B43legacy_WARN_ON(!(((u16)packetindex & 0xF000) == 0x0000));
 143         cookie |= (u16)packetindex;
 144
 145         return cookie;
 146 }
 147
 148 static
 149 struct b43legacy_pioqueue *parse_cookie(struct b43legacy_wldev *dev,
 150                                         u16 cookie,
 151                                         struct b43legacy_pio_txpacket **packet)
 152 {
 153         struct b43legacy_pio *pio = &dev->pio;
 154         struct b43legacy_pioqueue *queue = NULL;
 155         int packetindex;
 156
 157         switch (cookie & 0xF000) {
 158         case 0x0000:
 159                 queue = pio->queue0;
 160                 break;
 161         case 0x1000:
 162                 queue = pio->queue1;
 163                 break;
 164         case 0x2000:
 165                 queue = pio->queue2;
 166                 break;
 167         case 0x3000:
 168                 queue = pio->queue3;
 169                 break;
 170         default:
 171                 B43legacy_WARN_ON(1);
 172         }
 173         packetindex = (cookie & 0x0FFF);
 174         B43legacy_WARN_ON(!(packetindex >= 0 && packetindex
 175                           < B43legacy_PIO_MAXTXPACKETS));
 176         *packet = &(queue->tx_packets_cache[packetindex]);
 177
 178         return queue;
 179 }
 180
 181 union txhdr_union {
 182         struct b43legacy_txhdr_fw3 txhdr_fw3;
 183 };
 184
 185 static int pio_tx_write_fragment(struct b43legacy_pioqueue *queue,
 186                                   struct sk_buff *skb,
 187                                   struct b43legacy_pio_txpacket *packet,
 188                                   size_t txhdr_size)
 189 {
 190         union txhdr_union txhdr_data;
 191         u8 *txhdr = NULL;
 192         unsigned int octets;
 193         int err;
 194
 195         txhdr = (u8 *)(&txhdr_data.txhdr_fw3);
 196
 197         B43legacy_WARN_ON(skb_shinfo(skb)->nr_frags != 0);
 198         err = b43legacy_generate_txhdr(queue->dev,
 199                                  txhdr, skb->data, skb->len,
 200                                  IEEE80211_SKB_CB(skb),
 201                                  generate_cookie(queue, packet));
 202         if (err)
 203                 return err;
 204
 205         tx_start(queue);
 206         octets = skb->len + txhdr_size;
 207         if (queue->need_workarounds)
 208                 octets--;
 209         tx_data(queue, txhdr, (u8 *)skb->data, octets);
 210         tx_complete(queue, skb);
 211
 212         return 0;
 213 }
 214
 215 static void free_txpacket(struct b43legacy_pio_txpacket *packet,
 216                           int irq_context)
 217 {
 218         struct b43legacy_pioqueue *queue = packet->queue;
 219
 220         if (packet->skb) {
 221                 if (irq_context)
 222                         dev_kfree_skb_irq(packet->skb);
 223                 else
 224                         dev_kfree_skb(packet->skb);
 225         }
 226         list_move(&packet->list, &queue->txfree);
 227         queue->nr_txfree++;
 228 }
 229
 230 static int pio_tx_packet(struct b43legacy_pio_txpacket *packet)
 231 {
 232         struct b43legacy_pioqueue *queue = packet->queue;
 233         struct sk_buff *skb = packet->skb;
 234         u16 octets;
 235         int err;
 236
 237         octets = (u16)skb->len + sizeof(struct b43legacy_txhdr_fw3);
 238         if (queue->tx_devq_size < octets) {
 239                 b43legacywarn(queue->dev->wl, "PIO queue too small. "
 240                         "Dropping packet.\n");
 241                 /* Drop it silently (return success) */
 242                 free_txpacket(packet, 1);
 243                 return 0;
 244         }
 245         B43legacy_WARN_ON(queue->tx_devq_packets >
 246                           B43legacy_PIO_MAXTXDEVQPACKETS);
 247         B43legacy_WARN_ON(queue->tx_devq_used > queue->tx_devq_size);
 248         /* Check if there is sufficient free space on the device
 249          * TX queue. If not, return and let the TX tasklet
 250          * retry later.
 251          */
 252         if (queue->tx_devq_packets == B43legacy_PIO_MAXTXDEVQPACKETS)
 253                 return -EBUSY;
 254         if (queue->tx_devq_used + octets > queue->tx_devq_size)
 255                 return -EBUSY;
 256         /* Now poke the device. */
 257         err = pio_tx_write_fragment(queue, skb, packet,
 258                               sizeof(struct b43legacy_txhdr_fw3));
 259         if (unlikely(err == -ENOKEY)) {
 260                 /* Drop this packet, as we don't have the encryption key
 261                  * anymore and must not transmit it unencrypted. */
 262                 free_txpacket(packet, 1);
 263                 return 0;
 264         }
 265
 266         /* Account for the packet size.
 267          * (We must not overflow the device TX queue)
 268          */
 269         queue->tx_devq_packets++;
 270         queue->tx_devq_used += octets;
 271
 272         /* Transmission started, everything ok, move the
 273          * packet to the txrunning list.
 274          */
 275         list_move_tail(&packet->list, &queue->txrunning);
 276
 277         return 0;
 278 }
 279
 280 static void tx_tasklet(unsigned long d)
 281 {
 282         struct b43legacy_pioqueue *queue = (struct b43legacy_pioqueue *)d;
 283         struct b43legacy_wldev *dev = queue->dev;
 284         unsigned long flags;
 285         struct b43legacy_pio_txpacket *packet, *tmp_packet;
 286         int err;
 287         u16 txctl;
 288
 289         spin_lock_irqsave(&dev->wl->irq_lock, flags);
 290         if (queue->tx_frozen)
 291                 goto out_unlock;
 292         txctl = b43legacy_pio_read(queue, B43legacy_PIO_TXCTL);
 293         if (txctl & B43legacy_PIO_TXCTL_SUSPEND)
 294                 goto out_unlock;
 295
 296         list_for_each_entry_safe(packet, tmp_packet, &queue->txqueue, list) {
 297                 /* Try to transmit the packet. This can fail, if
 298                  * the device queue is full. In case of failure, the
 299                  * packet is left in the txqueue.
 300                  * If transmission succeed, the packet is moved to txrunning.
 301                  * If it is impossible to transmit the packet, it
 302                  * is dropped.
 303                  */
 304                 err = pio_tx_packet(packet);
 305                 if (err)
 306                         break;
 307         }
 308 out_unlock:
 309         spin_unlock_irqrestore(&dev->wl->irq_lock, flags);
 310 }
 311
 312 static void setup_txqueues(struct b43legacy_pioqueue *queue)
 313 {
 314         struct b43legacy_pio_txpacket *packet;
 315         int i;
 316
 317         queue->nr_txfree = B43legacy_PIO_MAXTXPACKETS;
 318         for (i = 0; i < B43legacy_PIO_MAXTXPACKETS; i++) {
 319                 packet = &(queue->tx_packets_cache[i]);
 320
 321                 packet->queue = queue;
 322                 INIT_LIST_HEAD(&packet->list);
 323
 324                 list_add(&packet->list, &queue->txfree);
 325         }
 326 }
 327
 328 static
 329 struct b43legacy_pioqueue *b43legacy_setup_pioqueue(struct b43legacy_wldev *dev,
 330                                                     u16 pio_mmio_base)
 331 {
 332         struct b43legacy_pioqueue *queue;
 333         u32 value;
 334         u16 qsize;
 335
 336         queue = kzalloc(sizeof(*queue), GFP_KERNEL);
 337         if (!queue)
 338                 goto out;
 339
 340         queue->dev = dev;
 341         queue->mmio_base = pio_mmio_base;
 342         queue->need_workarounds = (dev->dev->id.revision < 3);
 343
 344         INIT_LIST_HEAD(&queue->txfree);
 345         INIT_LIST_HEAD(&queue->txqueue);
 346         INIT_LIST_HEAD(&queue->txrunning);
 347         tasklet_init(&queue->txtask, tx_tasklet,
 348                      (unsigned long)queue);
 349
 350         value = b43legacy_read32(dev, B43legacy_MMIO_MACCTL);
 351         value &= ~B43legacy_MACCTL_BE;
 352         b43legacy_write32(dev, B43legacy_MMIO_MACCTL, value);
 353
 354         qsize = b43legacy_read16(dev, queue->mmio_base
 355                                  + B43legacy_PIO_TXQBUFSIZE);
 356         if (qsize == 0) {
 357                 b43legacyerr(dev->wl, "This card does not support PIO "
 358                        "operation mode. Please use DMA mode "
 359                        "(module parameter pio=0).\n");
 360                 goto err_freequeue;
 361         }
 362         if (qsize <= B43legacy_PIO_TXQADJUST) {
 363                 b43legacyerr(dev->wl, "PIO tx device-queue too small (%u)\n",
 364                        qsize);
 365                 goto err_freequeue;
 366         }
 367         qsize -= B43legacy_PIO_TXQADJUST;
 368         queue->tx_devq_size = qsize;
 369
 370         setup_txqueues(queue);
 371
 372 out:
 373         return queue;
 374
 375 err_freequeue:
 376         kfree(queue);
 377         queue = NULL;
 378         goto out;
 379 }
 380
 381 static void cancel_transfers(struct b43legacy_pioqueue *queue)
 382 {
 383         struct b43legacy_pio_txpacket *packet, *tmp_packet;
 384
 385         tasklet_kill(&queue->txtask);
 386
 387         list_for_each_entry_safe(packet, tmp_packet, &queue->txrunning, list)
 388                 free_txpacket(packet, 0);
 389         list_for_each_entry_safe(packet, tmp_packet, &queue->txqueue, list)
 390                 free_txpacket(packet, 0);
 391 }
 392
 393 static void b43legacy_destroy_pioqueue(struct b43legacy_pioqueue *queue)
 394 {
 395         if (!queue)
 396                 return;
 397
 398         cancel_transfers(queue);
 399         kfree(queue);
 400 }
 401
 402 void b43legacy_pio_free(struct b43legacy_wldev *dev)
 403 {
 404         struct b43legacy_pio *pio;
 405
 406         if (!b43legacy_using_pio(dev))
 407                 return;
 408         pio = &dev->pio;
 409
 410         b43legacy_destroy_pioqueue(pio->queue3);
 411         pio->queue3 = NULL;
 412         b43legacy_destroy_pioqueue(pio->queue2);
 413         pio->queue2 = NULL;
 414         b43legacy_destroy_pioqueue(pio->queue1);
 415         pio->queue1 = NULL;
 416         b43legacy_destroy_pioqueue(pio->queue0);
 417         pio->queue0 = NULL;
 418 }
 419
 420 int b43legacy_pio_init(struct b43legacy_wldev *dev)
 421 {
 422         struct b43legacy_pio *pio = &dev->pio;
 423         struct b43legacy_pioqueue *queue;
 424         int err = -ENOMEM;
 425
 426         queue = b43legacy_setup_pioqueue(dev, B43legacy_MMIO_PIO1_BASE);
 427         if (!queue)
 428                 goto out;
 429         pio->queue0 = queue;
 430
 431         queue = b43legacy_setup_pioqueue(dev, B43legacy_MMIO_PIO2_BASE);
 432         if (!queue)
 433                 goto err_destroy0;
 434         pio->queue1 = queue;
 435
 436         queue = b43legacy_setup_pioqueue(dev, B43legacy_MMIO_PIO3_BASE);
 437         if (!queue)
 438                 goto err_destroy1;
 439         pio->queue2 = queue;
 440
 441         queue = b43legacy_setup_pioqueue(dev, B43legacy_MMIO_PIO4_BASE);
 442         if (!queue)
 443                 goto err_destroy2;
 444         pio->queue3 = queue;
 445
 446         if (dev->dev->id.revision < 3)
 447                 dev->irq_mask |= B43legacy_IRQ_PIO_WORKAROUND;
 448
 449         b43legacydbg(dev->wl, "PIO initialized\n");
 450         err = 0;
 451 out:
 452         return err;
 453
 454 err_destroy2:
 455         b43legacy_destroy_pioqueue(pio->queue2);
 456         pio->queue2 = NULL;
 457 err_destroy1:
 458         b43legacy_destroy_pioqueue(pio->queue1);
 459         pio->queue1 = NULL;
 460 err_destroy0:
 461         b43legacy_destroy_pioqueue(pio->queue0);
 462         pio->queue0 = NULL;
 463         goto out;
 464 }
 465
 466 int b43legacy_pio_tx(struct b43legacy_wldev *dev,
 467                      struct sk_buff *skb)
 468 {
 469         struct b43legacy_pioqueue *queue = dev->pio.queue1;
 470         struct b43legacy_pio_txpacket *packet;
 471
 472         B43legacy_WARN_ON(queue->tx_suspended);
 473         B43legacy_WARN_ON(list_empty(&queue->txfree));
 474
 475         packet = list_entry(queue->txfree.next, struct b43legacy_pio_txpacket,
 476                             list);
 477         packet->skb = skb;
 478
 479         list_move_tail(&packet->list, &queue->txqueue);
 480         queue->nr_txfree--;
 481         B43legacy_WARN_ON(queue->nr_txfree >= B43legacy_PIO_MAXTXPACKETS);
 482
 483         tasklet_schedule(&queue->txtask);
 484
 485         return 0;
 486 }
 487
 488 void b43legacy_pio_handle_txstatus(struct b43legacy_wldev *dev,
 489                                    const struct b43legacy_txstatus *status)
 490 {
 491         struct b43legacy_pioqueue *queue;
 492         struct b43legacy_pio_txpacket *packet;
 493         struct ieee80211_tx_info *info;
 494         int retry_limit;
 495
 496         queue = parse_cookie(dev, status->cookie, &packet);
 497         B43legacy_WARN_ON(!queue);
 498
 499         if (!packet->skb)
 500                 return;
 501
 502         queue->tx_devq_packets--;
 503         queue->tx_devq_used -= (packet->skb->len +
 504                                 sizeof(struct b43legacy_txhdr_fw3));
 505
 506         info = IEEE80211_SKB_CB(packet->skb);
 507
 508         /* preserve the confiured retry limit before clearing the status
 509          * The xmit function has overwritten the rc's value with the actual
 510          * retry limit done by the hardware */
 511         retry_limit = info->status.rates[0].count;
 512         ieee80211_tx_info_clear_status(info);
 513
 514         if (status->acked)
 515                 info->flags |= IEEE80211_TX_STAT_ACK;
 516
 517         if (status->rts_count > dev->wl->hw->conf.short_frame_max_tx_count) {
 518                 /*
 519                  * If the short retries (RTS, not data frame) have exceeded
 520                  * the limit, the hw will not have tried the selected rate,
 521                  * but will have used the fallback rate instead.
 522                  * Don't let the rate control count attempts for the selected
 523                  * rate in this case, otherwise the statistics will be off.
 524                  */
 525                 info->status.rates[0].count = 0;
 526                 info->status.rates[1].count = status->frame_count;
 527         } else {
 528                 if (status->frame_count > retry_limit) {
 529                         info->status.rates[0].count = retry_limit;
 530                         info->status.rates[1].count = status->frame_count -
 531                                         retry_limit;
 532
 533                 } else {
 534                         info->status.rates[0].count = status->frame_count;
 535                         info->status.rates[1].idx = -1;
 536                 }
 537         }
 538         ieee80211_tx_status_irqsafe(dev->wl->hw, packet->skb);
 539         packet->skb = NULL;
 540
 541         free_txpacket(packet, 1);
 542         /* If there are packets on the txqueue, poke the tasklet
 543          * to transmit them.
 544          */
 545         if (!list_empty(&queue->txqueue))
 546                 tasklet_schedule(&queue->txtask);
 547 }
 548
 549 static void pio_rx_error(struct b43legacy_pioqueue *queue,
 550                          int clear_buffers,
 551                          const char *error)
 552 {
 553         int i;
 554
 555         b43legacyerr(queue->dev->wl, "PIO RX error: %s\n", error);
 556         b43legacy_pio_write(queue, B43legacy_PIO_RXCTL,
 557                             B43legacy_PIO_RXCTL_READY);
 558         if (clear_buffers) {
 559                 B43legacy_WARN_ON(queue->mmio_base != B43legacy_MMIO_PIO1_BASE);
 560                 for (i = 0; i < 15; i++) {
 561                         /* Dummy read. */
 562                         b43legacy_pio_read(queue, B43legacy_PIO_RXDATA);
 563                 }
 564         }
 565 }
 566
 567 void b43legacy_pio_rx(struct b43legacy_pioqueue *queue)
 568 {
 569         __le16 preamble[21] = { 0 };
 570         struct b43legacy_rxhdr_fw3 *rxhdr;
 571         u16 tmp;
 572         u16 len;
 573         u16 macstat;
 574         int i;
 575         int preamble_readwords;
 576         struct sk_buff *skb;
 577
 578         tmp = b43legacy_pio_read(queue, B43legacy_PIO_RXCTL);
 579         if (!(tmp & B43legacy_PIO_RXCTL_DATAAVAILABLE))
 580                 return;
 581         b43legacy_pio_write(queue, B43legacy_PIO_RXCTL,
 582                             B43legacy_PIO_RXCTL_DATAAVAILABLE);
 583
 584         for (i = 0; i < 10; i++) {
 585                 tmp = b43legacy_pio_read(queue, B43legacy_PIO_RXCTL);
 586                 if (tmp & B43legacy_PIO_RXCTL_READY)
 587                         goto data_ready;
 588                 udelay(10);
 589         }
 590         b43legacydbg(queue->dev->wl, "PIO RX timed out\n");
 591         return;
 592 data_ready:
 593
 594         len = b43legacy_pio_read(queue, B43legacy_PIO_RXDATA);
 595         if (unlikely(len > 0x700)) {
 596                 pio_rx_error(queue, 0, "len > 0x700");
 597                 return;
 598         }
 599         if (unlikely(len == 0 && queue->mmio_base !=
 600                      B43legacy_MMIO_PIO4_BASE)) {
 601                 pio_rx_error(queue, 0, "len == 0");
 602                 return;
 603         }
 604         preamble[0] = cpu_to_le16(len);
 605         if (queue->mmio_base == B43legacy_MMIO_PIO4_BASE)
 606                 preamble_readwords = 14 / sizeof(u16);
 607         else
 608                 preamble_readwords = 18 / sizeof(u16);
 609         for (i = 0; i < preamble_readwords; i++) {
 610                 tmp = b43legacy_pio_read(queue, B43legacy_PIO_RXDATA);
 611                 preamble[i + 1] = cpu_to_le16(tmp);
 612         }
 613         rxhdr = (struct b43legacy_rxhdr_fw3 *)preamble;
 614         macstat = le16_to_cpu(rxhdr->mac_status);
 615         if (macstat & B43legacy_RX_MAC_FCSERR) {
 616                 pio_rx_error(queue,
 617                              (queue->mmio_base == B43legacy_MMIO_PIO1_BASE),
 618                              "Frame FCS error");
 619                 return;
 620         }
 621         if (queue->mmio_base == B43legacy_MMIO_PIO4_BASE) {
 622                 /* We received an xmit status. */
 623                 struct b43legacy_hwtxstatus *hw;
 624
 625                 hw = (struct b43legacy_hwtxstatus *)(preamble + 1);
 626                 b43legacy_handle_hwtxstatus(queue->dev, hw);
 627
 628                 return;
 629         }
 630
 631         skb = dev_alloc_skb(len);
 632         if (unlikely(!skb)) {
 633                 pio_rx_error(queue, 1, "OOM");
 634                 return;
 635         }
 636         skb_put(skb, len);
 637         for (i = 0; i < len - 1; i += 2) {
 638                 tmp = b43legacy_pio_read(queue, B43legacy_PIO_RXDATA);
 639                 *((__le16 *)(skb->data + i)) = cpu_to_le16(tmp);
 640         }
 641         if (len % 2) {
 642                 tmp = b43legacy_pio_read(queue, B43legacy_PIO_RXDATA);
 643                 skb->data[len - 1] = (tmp & 0x00FF);
 644         }
 645         b43legacy_rx(queue->dev, skb, rxhdr);
 646 }
 647
 648 void b43legacy_pio_tx_suspend(struct b43legacy_pioqueue *queue)
 649 {
 650         b43legacy_power_saving_ctl_bits(queue->dev, -1, 1);
 651         b43legacy_pio_write(queue, B43legacy_PIO_TXCTL,
 652                             b43legacy_pio_read(queue, B43legacy_PIO_TXCTL)
 653                             | B43legacy_PIO_TXCTL_SUSPEND);
 654 }
 655
 656 void b43legacy_pio_tx_resume(struct b43legacy_pioqueue *queue)
 657 {
 658         b43legacy_pio_write(queue, B43legacy_PIO_TXCTL,
 659                             b43legacy_pio_read(queue, B43legacy_PIO_TXCTL)
 660                             & ~B43legacy_PIO_TXCTL_SUSPEND);
 661         b43legacy_power_saving_ctl_bits(queue->dev, -1, -1);
 662         tasklet_schedule(&queue->txtask);
 663 }
 664
 665 void b43legacy_pio_freeze_txqueues(struct b43legacy_wldev *dev)
 666 {
 667         struct b43legacy_pio *pio;
 668
 669         B43legacy_WARN_ON(!b43legacy_using_pio(dev));
 670         pio = &dev->pio;
 671         pio->queue0->tx_frozen = 1;
 672         pio->queue1->tx_frozen = 1;
 673         pio->queue2->tx_frozen = 1;
 674         pio->queue3->tx_frozen = 1;
 675 }
 676
 677 void b43legacy_pio_thaw_txqueues(struct b43legacy_wldev *dev)
 678 {
 679         struct b43legacy_pio *pio;
 680
 681         B43legacy_WARN_ON(!b43legacy_using_pio(dev));
 682         pio = &dev->pio;
 683         pio->queue0->tx_frozen = 0;
 684         pio->queue1->tx_frozen = 0;
 685         pio->queue2->tx_frozen = 0;
 686         pio->queue3->tx_frozen = 0;
 687         if (!list_empty(&pio->queue0->txqueue))
 688                 tasklet_schedule(&pio->queue0->txtask);
 689         if (!list_empty(&pio->queue1->txqueue))
 690                 tasklet_schedule(&pio->queue1->txtask);
 691         if (!list_empty(&pio->queue2->txqueue))
 692                 tasklet_schedule(&pio->queue2->txtask);
 693         if (!list_empty(&pio->queue3->txqueue))
 694                 tasklet_schedule(&pio->queue3->txtask);
 695 }