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1// SPDX-License-Identifier: GPL-2.0-or-later2/*3 4 Broadcom B43legacy wireless driver5 6 PIO Transmission7 8 Copyright (c) 2005 Michael Buesch <m@bues.ch>9 10 11*/12 13#include "b43legacy.h"14#include "pio.h"15#include "main.h"16#include "xmit.h"17 18#include <linux/delay.h>19#include <linux/slab.h>20 21 22static void tx_start(struct b43legacy_pioqueue *queue)23{24 b43legacy_pio_write(queue, B43legacy_PIO_TXCTL,25 B43legacy_PIO_TXCTL_INIT);26}27 28static void tx_octet(struct b43legacy_pioqueue *queue,29 u8 octet)30{31 if (queue->need_workarounds) {32 b43legacy_pio_write(queue, B43legacy_PIO_TXDATA, octet);33 b43legacy_pio_write(queue, B43legacy_PIO_TXCTL,34 B43legacy_PIO_TXCTL_WRITELO);35 } else {36 b43legacy_pio_write(queue, B43legacy_PIO_TXCTL,37 B43legacy_PIO_TXCTL_WRITELO);38 b43legacy_pio_write(queue, B43legacy_PIO_TXDATA, octet);39 }40}41 42static u16 tx_get_next_word(const u8 *txhdr,43 const u8 *packet,44 size_t txhdr_size,45 unsigned int *pos)46{47 const u8 *source;48 unsigned int i = *pos;49 u16 ret;50 51 if (i < txhdr_size)52 source = txhdr;53 else {54 source = packet;55 i -= txhdr_size;56 }57 ret = le16_to_cpu(*((__le16 *)(source + i)));58 *pos += 2;59 60 return ret;61}62 63static void tx_data(struct b43legacy_pioqueue *queue,64 u8 *txhdr,65 const u8 *packet,66 unsigned int octets)67{68 u16 data;69 unsigned int i = 0;70 71 if (queue->need_workarounds) {72 data = tx_get_next_word(txhdr, packet,73 sizeof(struct b43legacy_txhdr_fw3), &i);74 b43legacy_pio_write(queue, B43legacy_PIO_TXDATA, data);75 }76 b43legacy_pio_write(queue, B43legacy_PIO_TXCTL,77 B43legacy_PIO_TXCTL_WRITELO |78 B43legacy_PIO_TXCTL_WRITEHI);79 while (i < octets - 1) {80 data = tx_get_next_word(txhdr, packet,81 sizeof(struct b43legacy_txhdr_fw3), &i);82 b43legacy_pio_write(queue, B43legacy_PIO_TXDATA, data);83 }84 if (octets % 2)85 tx_octet(queue, packet[octets -86 sizeof(struct b43legacy_txhdr_fw3) - 1]);87}88 89static void tx_complete(struct b43legacy_pioqueue *queue,90 struct sk_buff *skb)91{92 if (queue->need_workarounds) {93 b43legacy_pio_write(queue, B43legacy_PIO_TXDATA,94 skb->data[skb->len - 1]);95 b43legacy_pio_write(queue, B43legacy_PIO_TXCTL,96 B43legacy_PIO_TXCTL_WRITELO |97 B43legacy_PIO_TXCTL_COMPLETE);98 } else99 b43legacy_pio_write(queue, B43legacy_PIO_TXCTL,100 B43legacy_PIO_TXCTL_COMPLETE);101}102 103static u16 generate_cookie(struct b43legacy_pioqueue *queue,104 struct b43legacy_pio_txpacket *packet)105{106 u16 cookie = 0x0000;107 int packetindex;108 109 /* We use the upper 4 bits for the PIO110 * controller ID and the lower 12 bits111 * for the packet index (in the cache).112 */113 switch (queue->mmio_base) {114 case B43legacy_MMIO_PIO1_BASE:115 break;116 case B43legacy_MMIO_PIO2_BASE:117 cookie = 0x1000;118 break;119 case B43legacy_MMIO_PIO3_BASE:120 cookie = 0x2000;121 break;122 case B43legacy_MMIO_PIO4_BASE:123 cookie = 0x3000;124 break;125 default:126 B43legacy_WARN_ON(1);127 }128 packetindex = pio_txpacket_getindex(packet);129 B43legacy_WARN_ON(!(((u16)packetindex & 0xF000) == 0x0000));130 cookie |= (u16)packetindex;131 132 return cookie;133}134 135static136struct b43legacy_pioqueue *parse_cookie(struct b43legacy_wldev *dev,137 u16 cookie,138 struct b43legacy_pio_txpacket **packet)139{140 struct b43legacy_pio *pio = &dev->pio;141 struct b43legacy_pioqueue *queue = NULL;142 int packetindex;143 144 switch (cookie & 0xF000) {145 case 0x0000:146 queue = pio->queue0;147 break;148 case 0x1000:149 queue = pio->queue1;150 break;151 case 0x2000:152 queue = pio->queue2;153 break;154 case 0x3000:155 queue = pio->queue3;156 break;157 default:158 B43legacy_WARN_ON(1);159 }160 packetindex = (cookie & 0x0FFF);161 B43legacy_WARN_ON(!(packetindex >= 0 && packetindex162 < B43legacy_PIO_MAXTXPACKETS));163 *packet = &(queue->tx_packets_cache[packetindex]);164 165 return queue;166}167 168union txhdr_union {169 struct b43legacy_txhdr_fw3 txhdr_fw3;170};171 172static int pio_tx_write_fragment(struct b43legacy_pioqueue *queue,173 struct sk_buff *skb,174 struct b43legacy_pio_txpacket *packet,175 size_t txhdr_size)176{177 union txhdr_union txhdr_data;178 u8 *txhdr = NULL;179 unsigned int octets;180 int err;181 182 txhdr = (u8 *)(&txhdr_data.txhdr_fw3);183 184 B43legacy_WARN_ON(skb_shinfo(skb)->nr_frags != 0);185 err = b43legacy_generate_txhdr(queue->dev,186 txhdr, skb->data, skb->len,187 IEEE80211_SKB_CB(skb),188 generate_cookie(queue, packet));189 if (err)190 return err;191 192 tx_start(queue);193 octets = skb->len + txhdr_size;194 if (queue->need_workarounds)195 octets--;196 tx_data(queue, txhdr, (u8 *)skb->data, octets);197 tx_complete(queue, skb);198 199 return 0;200}201 202static void free_txpacket(struct b43legacy_pio_txpacket *packet,203 int irq_context)204{205 struct b43legacy_pioqueue *queue = packet->queue;206 207 if (packet->skb) {208 if (irq_context)209 dev_kfree_skb_irq(packet->skb);210 else211 dev_kfree_skb(packet->skb);212 }213 list_move(&packet->list, &queue->txfree);214 queue->nr_txfree++;215}216 217static int pio_tx_packet(struct b43legacy_pio_txpacket *packet)218{219 struct b43legacy_pioqueue *queue = packet->queue;220 struct sk_buff *skb = packet->skb;221 u16 octets;222 int err;223 224 octets = (u16)skb->len + sizeof(struct b43legacy_txhdr_fw3);225 if (queue->tx_devq_size < octets) {226 b43legacywarn(queue->dev->wl, "PIO queue too small. "227 "Dropping packet.\n");228 /* Drop it silently (return success) */229 free_txpacket(packet, 1);230 return 0;231 }232 B43legacy_WARN_ON(queue->tx_devq_packets >233 B43legacy_PIO_MAXTXDEVQPACKETS);234 B43legacy_WARN_ON(queue->tx_devq_used > queue->tx_devq_size);235 /* Check if there is sufficient free space on the device236 * TX queue. If not, return and let the TX tasklet237 * retry later.238 */239 if (queue->tx_devq_packets == B43legacy_PIO_MAXTXDEVQPACKETS)240 return -EBUSY;241 if (queue->tx_devq_used + octets > queue->tx_devq_size)242 return -EBUSY;243 /* Now poke the device. */244 err = pio_tx_write_fragment(queue, skb, packet,245 sizeof(struct b43legacy_txhdr_fw3));246 if (unlikely(err == -ENOKEY)) {247 /* Drop this packet, as we don't have the encryption key248 * anymore and must not transmit it unencrypted. */249 free_txpacket(packet, 1);250 return 0;251 }252 253 /* Account for the packet size.254 * (We must not overflow the device TX queue)255 */256 queue->tx_devq_packets++;257 queue->tx_devq_used += octets;258 259 /* Transmission started, everything ok, move the260 * packet to the txrunning list.261 */262 list_move_tail(&packet->list, &queue->txrunning);263 264 return 0;265}266 267static void tx_tasklet(struct tasklet_struct *t)268{269 struct b43legacy_pioqueue *queue = from_tasklet(queue, t, txtask);270 struct b43legacy_wldev *dev = queue->dev;271 unsigned long flags;272 struct b43legacy_pio_txpacket *packet, *tmp_packet;273 int err;274 u16 txctl;275 276 spin_lock_irqsave(&dev->wl->irq_lock, flags);277 if (queue->tx_frozen)278 goto out_unlock;279 txctl = b43legacy_pio_read(queue, B43legacy_PIO_TXCTL);280 if (txctl & B43legacy_PIO_TXCTL_SUSPEND)281 goto out_unlock;282 283 list_for_each_entry_safe(packet, tmp_packet, &queue->txqueue, list) {284 /* Try to transmit the packet. This can fail, if285 * the device queue is full. In case of failure, the286 * packet is left in the txqueue.287 * If transmission succeed, the packet is moved to txrunning.288 * If it is impossible to transmit the packet, it289 * is dropped.290 */291 err = pio_tx_packet(packet);292 if (err)293 break;294 }295out_unlock:296 spin_unlock_irqrestore(&dev->wl->irq_lock, flags);297}298 299static void setup_txqueues(struct b43legacy_pioqueue *queue)300{301 struct b43legacy_pio_txpacket *packet;302 int i;303 304 queue->nr_txfree = B43legacy_PIO_MAXTXPACKETS;305 for (i = 0; i < B43legacy_PIO_MAXTXPACKETS; i++) {306 packet = &(queue->tx_packets_cache[i]);307 308 packet->queue = queue;309 INIT_LIST_HEAD(&packet->list);310 311 list_add(&packet->list, &queue->txfree);312 }313}314 315static316struct b43legacy_pioqueue *b43legacy_setup_pioqueue(struct b43legacy_wldev *dev,317 u16 pio_mmio_base)318{319 struct b43legacy_pioqueue *queue;320 u32 value;321 u16 qsize;322 323 queue = kzalloc(sizeof(*queue), GFP_KERNEL);324 if (!queue)325 goto out;326 327 queue->dev = dev;328 queue->mmio_base = pio_mmio_base;329 queue->need_workarounds = (dev->dev->id.revision < 3);330 331 INIT_LIST_HEAD(&queue->txfree);332 INIT_LIST_HEAD(&queue->txqueue);333 INIT_LIST_HEAD(&queue->txrunning);334 tasklet_setup(&queue->txtask, tx_tasklet);335 336 value = b43legacy_read32(dev, B43legacy_MMIO_MACCTL);337 value &= ~B43legacy_MACCTL_BE;338 b43legacy_write32(dev, B43legacy_MMIO_MACCTL, value);339 340 qsize = b43legacy_read16(dev, queue->mmio_base341 + B43legacy_PIO_TXQBUFSIZE);342 if (qsize == 0) {343 b43legacyerr(dev->wl, "This card does not support PIO "344 "operation mode. Please use DMA mode "345 "(module parameter pio=0).\n");346 goto err_freequeue;347 }348 if (qsize <= B43legacy_PIO_TXQADJUST) {349 b43legacyerr(dev->wl, "PIO tx device-queue too small (%u)\n",350 qsize);351 goto err_freequeue;352 }353 qsize -= B43legacy_PIO_TXQADJUST;354 queue->tx_devq_size = qsize;355 356 setup_txqueues(queue);357 358out:359 return queue;360 361err_freequeue:362 kfree(queue);363 queue = NULL;364 goto out;365}366 367static void cancel_transfers(struct b43legacy_pioqueue *queue)368{369 struct b43legacy_pio_txpacket *packet, *tmp_packet;370 371 tasklet_kill(&queue->txtask);372 373 list_for_each_entry_safe(packet, tmp_packet, &queue->txrunning, list)374 free_txpacket(packet, 0);375 list_for_each_entry_safe(packet, tmp_packet, &queue->txqueue, list)376 free_txpacket(packet, 0);377}378 379static void b43legacy_destroy_pioqueue(struct b43legacy_pioqueue *queue)380{381 if (!queue)382 return;383 384 cancel_transfers(queue);385 kfree(queue);386}387 388void b43legacy_pio_free(struct b43legacy_wldev *dev)389{390 struct b43legacy_pio *pio;391 392 if (!b43legacy_using_pio(dev))393 return;394 pio = &dev->pio;395 396 b43legacy_destroy_pioqueue(pio->queue3);397 pio->queue3 = NULL;398 b43legacy_destroy_pioqueue(pio->queue2);399 pio->queue2 = NULL;400 b43legacy_destroy_pioqueue(pio->queue1);401 pio->queue1 = NULL;402 b43legacy_destroy_pioqueue(pio->queue0);403 pio->queue0 = NULL;404}405 406int b43legacy_pio_init(struct b43legacy_wldev *dev)407{408 struct b43legacy_pio *pio = &dev->pio;409 struct b43legacy_pioqueue *queue;410 int err = -ENOMEM;411 412 queue = b43legacy_setup_pioqueue(dev, B43legacy_MMIO_PIO1_BASE);413 if (!queue)414 goto out;415 pio->queue0 = queue;416 417 queue = b43legacy_setup_pioqueue(dev, B43legacy_MMIO_PIO2_BASE);418 if (!queue)419 goto err_destroy0;420 pio->queue1 = queue;421 422 queue = b43legacy_setup_pioqueue(dev, B43legacy_MMIO_PIO3_BASE);423 if (!queue)424 goto err_destroy1;425 pio->queue2 = queue;426 427 queue = b43legacy_setup_pioqueue(dev, B43legacy_MMIO_PIO4_BASE);428 if (!queue)429 goto err_destroy2;430 pio->queue3 = queue;431 432 if (dev->dev->id.revision < 3)433 dev->irq_mask |= B43legacy_IRQ_PIO_WORKAROUND;434 435 b43legacydbg(dev->wl, "PIO initialized\n");436 err = 0;437out:438 return err;439 440err_destroy2:441 b43legacy_destroy_pioqueue(pio->queue2);442 pio->queue2 = NULL;443err_destroy1:444 b43legacy_destroy_pioqueue(pio->queue1);445 pio->queue1 = NULL;446err_destroy0:447 b43legacy_destroy_pioqueue(pio->queue0);448 pio->queue0 = NULL;449 goto out;450}451 452int b43legacy_pio_tx(struct b43legacy_wldev *dev,453 struct sk_buff *skb)454{455 struct b43legacy_pioqueue *queue = dev->pio.queue1;456 struct b43legacy_pio_txpacket *packet;457 458 B43legacy_WARN_ON(queue->tx_suspended);459 B43legacy_WARN_ON(list_empty(&queue->txfree));460 461 packet = list_entry(queue->txfree.next, struct b43legacy_pio_txpacket,462 list);463 packet->skb = skb;464 465 list_move_tail(&packet->list, &queue->txqueue);466 queue->nr_txfree--;467 B43legacy_WARN_ON(queue->nr_txfree >= B43legacy_PIO_MAXTXPACKETS);468 469 tasklet_schedule(&queue->txtask);470 471 return 0;472}473 474void b43legacy_pio_handle_txstatus(struct b43legacy_wldev *dev,475 const struct b43legacy_txstatus *status)476{477 struct b43legacy_pioqueue *queue;478 struct b43legacy_pio_txpacket *packet;479 struct ieee80211_tx_info *info;480 int retry_limit;481 482 queue = parse_cookie(dev, status->cookie, &packet);483 B43legacy_WARN_ON(!queue);484 485 if (!packet->skb)486 return;487 488 queue->tx_devq_packets--;489 queue->tx_devq_used -= (packet->skb->len +490 sizeof(struct b43legacy_txhdr_fw3));491 492 info = IEEE80211_SKB_CB(packet->skb);493 494 /* preserve the confiured retry limit before clearing the status495 * The xmit function has overwritten the rc's value with the actual496 * retry limit done by the hardware */497 retry_limit = info->status.rates[0].count;498 ieee80211_tx_info_clear_status(info);499 500 if (status->acked)501 info->flags |= IEEE80211_TX_STAT_ACK;502 503 if (status->rts_count > dev->wl->hw->conf.short_frame_max_tx_count) {504 /*505 * If the short retries (RTS, not data frame) have exceeded506 * the limit, the hw will not have tried the selected rate,507 * but will have used the fallback rate instead.508 * Don't let the rate control count attempts for the selected509 * rate in this case, otherwise the statistics will be off.510 */511 info->status.rates[0].count = 0;512 info->status.rates[1].count = status->frame_count;513 } else {514 if (status->frame_count > retry_limit) {515 info->status.rates[0].count = retry_limit;516 info->status.rates[1].count = status->frame_count -517 retry_limit;518 519 } else {520 info->status.rates[0].count = status->frame_count;521 info->status.rates[1].idx = -1;522 }523 }524 ieee80211_tx_status_irqsafe(dev->wl->hw, packet->skb);525 packet->skb = NULL;526 527 free_txpacket(packet, 1);528 /* If there are packets on the txqueue, poke the tasklet529 * to transmit them.530 */531 if (!list_empty(&queue->txqueue))532 tasklet_schedule(&queue->txtask);533}534 535static void pio_rx_error(struct b43legacy_pioqueue *queue,536 int clear_buffers,537 const char *error)538{539 int i;540 541 b43legacyerr(queue->dev->wl, "PIO RX error: %s\n", error);542 b43legacy_pio_write(queue, B43legacy_PIO_RXCTL,543 B43legacy_PIO_RXCTL_READY);544 if (clear_buffers) {545 B43legacy_WARN_ON(queue->mmio_base != B43legacy_MMIO_PIO1_BASE);546 for (i = 0; i < 15; i++) {547 /* Dummy read. */548 b43legacy_pio_read(queue, B43legacy_PIO_RXDATA);549 }550 }551}552 553void b43legacy_pio_rx(struct b43legacy_pioqueue *queue)554{555 __le16 preamble[21] = { 0 };556 struct b43legacy_rxhdr_fw3 *rxhdr;557 u16 tmp;558 u16 len;559 u16 macstat;560 int i;561 int preamble_readwords;562 struct sk_buff *skb;563 564 tmp = b43legacy_pio_read(queue, B43legacy_PIO_RXCTL);565 if (!(tmp & B43legacy_PIO_RXCTL_DATAAVAILABLE))566 return;567 b43legacy_pio_write(queue, B43legacy_PIO_RXCTL,568 B43legacy_PIO_RXCTL_DATAAVAILABLE);569 570 for (i = 0; i < 10; i++) {571 tmp = b43legacy_pio_read(queue, B43legacy_PIO_RXCTL);572 if (tmp & B43legacy_PIO_RXCTL_READY)573 goto data_ready;574 udelay(10);575 }576 b43legacydbg(queue->dev->wl, "PIO RX timed out\n");577 return;578data_ready:579 580 len = b43legacy_pio_read(queue, B43legacy_PIO_RXDATA);581 if (unlikely(len > 0x700)) {582 pio_rx_error(queue, 0, "len > 0x700");583 return;584 }585 if (unlikely(len == 0 && queue->mmio_base !=586 B43legacy_MMIO_PIO4_BASE)) {587 pio_rx_error(queue, 0, "len == 0");588 return;589 }590 preamble[0] = cpu_to_le16(len);591 if (queue->mmio_base == B43legacy_MMIO_PIO4_BASE)592 preamble_readwords = 14 / sizeof(u16);593 else594 preamble_readwords = 18 / sizeof(u16);595 for (i = 0; i < preamble_readwords; i++) {596 tmp = b43legacy_pio_read(queue, B43legacy_PIO_RXDATA);597 preamble[i + 1] = cpu_to_le16(tmp);598 }599 rxhdr = (struct b43legacy_rxhdr_fw3 *)preamble;600 macstat = le16_to_cpu(rxhdr->mac_status);601 if (macstat & B43legacy_RX_MAC_FCSERR) {602 pio_rx_error(queue,603 (queue->mmio_base == B43legacy_MMIO_PIO1_BASE),604 "Frame FCS error");605 return;606 }607 if (queue->mmio_base == B43legacy_MMIO_PIO4_BASE) {608 /* We received an xmit status. */609 struct b43legacy_hwtxstatus *hw;610 611 hw = (struct b43legacy_hwtxstatus *)(preamble + 1);612 b43legacy_handle_hwtxstatus(queue->dev, hw);613 614 return;615 }616 617 skb = dev_alloc_skb(len);618 if (unlikely(!skb)) {619 pio_rx_error(queue, 1, "OOM");620 return;621 }622 skb_put(skb, len);623 for (i = 0; i < len - 1; i += 2) {624 tmp = b43legacy_pio_read(queue, B43legacy_PIO_RXDATA);625 *((__le16 *)(skb->data + i)) = cpu_to_le16(tmp);626 }627 if (len % 2) {628 tmp = b43legacy_pio_read(queue, B43legacy_PIO_RXDATA);629 skb->data[len - 1] = (tmp & 0x00FF);630 }631 b43legacy_rx(queue->dev, skb, rxhdr);632}633 634void b43legacy_pio_tx_suspend(struct b43legacy_pioqueue *queue)635{636 b43legacy_power_saving_ctl_bits(queue->dev, -1, 1);637 b43legacy_pio_write(queue, B43legacy_PIO_TXCTL,638 b43legacy_pio_read(queue, B43legacy_PIO_TXCTL)639 | B43legacy_PIO_TXCTL_SUSPEND);640}641 642void b43legacy_pio_tx_resume(struct b43legacy_pioqueue *queue)643{644 b43legacy_pio_write(queue, B43legacy_PIO_TXCTL,645 b43legacy_pio_read(queue, B43legacy_PIO_TXCTL)646 & ~B43legacy_PIO_TXCTL_SUSPEND);647 b43legacy_power_saving_ctl_bits(queue->dev, -1, -1);648 tasklet_schedule(&queue->txtask);649}650 651void b43legacy_pio_freeze_txqueues(struct b43legacy_wldev *dev)652{653 struct b43legacy_pio *pio;654 655 B43legacy_WARN_ON(!b43legacy_using_pio(dev));656 pio = &dev->pio;657 pio->queue0->tx_frozen = 1;658 pio->queue1->tx_frozen = 1;659 pio->queue2->tx_frozen = 1;660 pio->queue3->tx_frozen = 1;661}662 663void b43legacy_pio_thaw_txqueues(struct b43legacy_wldev *dev)664{665 struct b43legacy_pio *pio;666 667 B43legacy_WARN_ON(!b43legacy_using_pio(dev));668 pio = &dev->pio;669 pio->queue0->tx_frozen = 0;670 pio->queue1->tx_frozen = 0;671 pio->queue2->tx_frozen = 0;672 pio->queue3->tx_frozen = 0;673 if (!list_empty(&pio->queue0->txqueue))674 tasklet_schedule(&pio->queue0->txtask);675 if (!list_empty(&pio->queue1->txqueue))676 tasklet_schedule(&pio->queue1->txtask);677 if (!list_empty(&pio->queue2->txqueue))678 tasklet_schedule(&pio->queue2->txtask);679 if (!list_empty(&pio->queue3->txqueue))680 tasklet_schedule(&pio->queue3->txtask);681}682