2 * carl9170 firmware - used by the ar9170 wireless device
4 * Interface to the WLAN part of the chip
6 * Copyright (c) 2000-2005 ZyDAS Technology Corporation
7 * Copyright (c) 2007-2009 Atheros Communications, Inc.
8 * Copyright 2009 Johannes Berg <johannes@sipsolutions.net>
9 * Copyright 2009-2011 Christian Lamparter <chunkeey@googlemail.com>
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.
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.
21 * You should have received a copy of the GNU General Public License along
22 * with this program; if not, write to the Free Software Foundation, Inc.,
23 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
27 #include "shared/phy.h"
33 #include "linux/ieee80211.h"
36 static void wlan_txunstuck(unsigned int queue)
38 set_wlan_txq_dma_addr(queue, ((uint32_t) fw.wlan.tx_queue[queue].head) | 1);
41 #ifdef CONFIG_CARL9170FW_DMA_QUEUE_BUMP
42 static void wlan_txupdate(unsigned int queue)
44 set_wlan_txq_dma_addr(queue, ((uint32_t) fw.wlan.tx_queue[queue].head));
47 static void wlan_dma_bump(unsigned int qidx)
49 unsigned int offset = qidx;
50 uint32_t status, trigger;
52 status = get(AR9170_MAC_REG_DMA_STATUS) >> 12;
53 trigger = get(AR9170_MAC_REG_DMA_TRIGGER) >> 12;
64 if ((trigger == 0xa) && (status == 0x8)) {
72 #endif /* CONFIG_CARL9170FW_DMA_QUEUE_BUMP */
74 #ifdef CONFIG_CARL9170FW_DEBUG
75 static void wlan_dump_queue(unsigned int qidx)
78 struct dma_desc *desc;
79 struct carl9170_tx_superframe *super;
82 __for_each_desc(desc, &fw.wlan.tx_queue[qidx]) {
83 super = get_super(desc);
84 DBG("%d: %p s:%x c:%x tl:%x ds:%x n:%p l:%p ", entries, desc,
85 desc->status, desc->ctrl, desc->totalLen,
86 desc->dataSize, desc->nextAddr, desc->lastAddr);
88 DBG("c:%x tr:%d ri:%d l:%x m:%x p:%x fc:%x",
89 super->s.cookie, super->s.cnt, super->s.rix,
90 super->f.hdr.length, super->f.hdr.mac.set,
91 (unsigned int) le32_to_cpu(super->f.hdr.phy.set),
92 super->f.data.i3e.frame_control);
97 desc = get_wlan_txq_addr(qidx);
99 DBG("Queue: %d: te:%d td:%d h:%p c:%p t:%p",
100 qidx, entries, queue_len(&fw.wlan.tx_queue[qidx]),
101 fw.wlan.tx_queue[qidx].head,
102 desc, fw.wlan.tx_queue[qidx].terminator);
104 DBG("HW: t:%x s:%x ac:%x c:%x",
105 (unsigned int) get(AR9170_MAC_REG_DMA_TRIGGER),
106 (unsigned int) get(AR9170_MAC_REG_DMA_STATUS),
107 (unsigned int) get(AR9170_MAC_REG_AMPDU_COUNT),
108 (unsigned int) get(AR9170_MAC_REG_DMA_TXQX_ADDR_CURR));
110 #endif /* CONFIG_CARL9170FW_DEBUG */
112 static void wlan_send_buffered_tx_status(void)
116 while (fw.wlan.tx_status_pending) {
117 len = min((unsigned int)fw.wlan.tx_status_pending,
118 CARL9170_RSP_TX_STATUS_NUM);
119 len = min(len, CARL9170_TX_STATUS_NUM - fw.wlan.tx_status_head_idx);
122 * rather than memcpy each individual request into a large buffer,
123 * we _splice_ them all together.
125 * The only downside is however that we have to be careful around
126 * the edges of the tx_status_cache.
129 * Each tx_status is about 2 bytes. However every command package
130 * must have a size which is a multiple of 4.
133 send_cmd_to_host((len * sizeof(struct carl9170_tx_status) + 3) & ~3,
134 CARL9170_RSP_TXCOMP, len, (void *)
135 &fw.wlan.tx_status_cache[fw.wlan.tx_status_head_idx]);
137 fw.wlan.tx_status_pending -= len;
138 fw.wlan.tx_status_head_idx += len;
139 fw.wlan.tx_status_head_idx %= CARL9170_TX_STATUS_NUM;
143 static struct carl9170_tx_status *wlan_get_tx_status_buffer(void)
145 struct carl9170_tx_status *tmp;
147 tmp = &fw.wlan.tx_status_cache[fw.wlan.tx_status_tail_idx++];
148 fw.wlan.tx_status_tail_idx %= CARL9170_TX_STATUS_NUM;
150 if (fw.wlan.tx_status_pending == CARL9170_TX_STATUS_NUM)
151 wlan_send_buffered_tx_status();
153 fw.wlan.tx_status_pending++;
158 /* generate _aggregated_ tx_status for the host */
159 void wlan_tx_complete(struct carl9170_tx_superframe *super,
162 struct carl9170_tx_status *status;
164 status = wlan_get_tx_status_buffer();
167 * The *unique* cookie and AC_ID is used by the driver for
170 status->cookie = super->s.cookie;
171 status->queue = super->s.queue;
175 * This field holds the number of tries of the rate in
176 * the rate index field (rix).
178 status->rix = super->s.rix;
179 status->tries = super->s.cnt;
180 status->success = (txs) ? 1 : 0;
183 static bool wlan_tx_consume_retry(struct carl9170_tx_superframe *super)
185 /* check if this was the last possible retry with this rate */
186 if (unlikely(super->s.cnt >= super->s.ri[super->s.rix].tries)) {
187 /* end of the road - indicate tx failure */
188 if (unlikely(super->s.rix == CARL9170_TX_MAX_RETRY_RATES))
191 /* check if there are alternative rates available */
192 if (!super->s.rr[super->s.rix].set)
195 /* try next retry rate */
196 super->f.hdr.phy.set = super->s.rr[super->s.rix].set;
198 /* finally - mark the old rate as USED */
201 /* update MAC flags */
202 super->f.hdr.mac.erp_prot = super->s.ri[super->s.rix].erp_prot;
203 super->f.hdr.mac.ampdu = super->s.ri[super->s.rix].ampdu;
205 /* reinitialize try counter */
208 /* just increase retry counter */
215 static inline u16 get_tid(struct ieee80211_hdr *hdr)
217 return (ieee80211_get_qos_ctl(hdr))[0] & IEEE80211_QOS_CTL_TID_MASK;
220 /* This function will only work on uint32_t-aligned pointers! */
221 static bool same_hdr(const void *_d0, const void *_d1)
223 const uint32_t *d0 = _d0;
224 const uint32_t *d1 = _d1;
226 /* BUG_ON((unsigned long)d0 & 3 || (unsigned long)d1 & 3)) */
227 return !((d0[0] ^ d1[0]) | /* FC + DU */
228 (d0[1] ^ d1[1]) | /* addr1 */
229 (d0[2] ^ d1[2]) | (d0[3] ^ d1[3]) | /* addr2 + addr3 */
230 (d0[4] ^ d1[4])); /* addr3 */
233 static inline bool same_aggr(struct ieee80211_hdr *a, struct ieee80211_hdr *b)
235 return (get_tid(a) == get_tid(b)) || same_hdr(a, b);
238 static void wlan_tx_ampdu_reset(unsigned int qidx)
240 fw.wlan.ampdu_prev[qidx] = NULL;
243 static void wlan_tx_ampdu_end(unsigned int qidx)
245 struct carl9170_tx_superframe *ht_prev = fw.wlan.ampdu_prev[qidx];
248 ht_prev->f.hdr.mac.ba_end = 1;
250 wlan_tx_ampdu_reset(qidx);
253 static void wlan_tx_ampdu(struct carl9170_tx_superframe *super)
255 unsigned int qidx = super->s.queue;
256 struct carl9170_tx_superframe *ht_prev = fw.wlan.ampdu_prev[qidx];
258 if (super->f.hdr.mac.ampdu) {
260 !same_aggr(&super->f.data.i3e, &ht_prev->f.data.i3e))
261 ht_prev->f.hdr.mac.ba_end = 1;
263 super->f.hdr.mac.ba_end = 0;
265 fw.wlan.ampdu_prev[qidx] = super;
267 wlan_tx_ampdu_end(qidx);
272 static void __wlan_tx(struct dma_desc *desc)
274 struct carl9170_tx_superframe *super = get_super(desc);
276 if (unlikely(super->s.fill_in_tsf)) {
277 struct ieee80211_mgmt *mgmt = (void *) &super->f.data.i3e;
278 uint32_t *tsf = (uint32_t *) &mgmt->u.probe_resp.timestamp;
281 * Truth be told: this is a hack.
283 * The *real* TSF is definitely going to be higher/older.
284 * But this hardware emulation code is head and shoulders
285 * above anything a driver can possibly do.
287 * (even, if it's got an accurate atomic clock source).
293 wlan_tx_ampdu(super);
295 #ifdef CONFIG_CARL9170FW_DEBUG
296 BUG_ON(fw.phy.psm.state != CARL9170_PSM_WAKE);
297 #endif /* CONFIG_CARL9170FW_DEBUG */
299 /* insert desc into the right queue */
300 dma_put(&fw.wlan.tx_queue[super->s.queue], desc);
303 static void wlan_assign_seq(struct ieee80211_hdr *hdr, unsigned int vif)
305 hdr->seq_ctrl &= cpu_to_le16(~IEEE80211_SCTL_SEQ);
306 hdr->seq_ctrl |= cpu_to_le16(fw.wlan.sequence[vif]);
308 if (ieee80211_is_first_frag(hdr->seq_ctrl))
309 fw.wlan.sequence[vif] += 0x10;
312 /* prepares frame for the first transmission */
313 static void _wlan_tx(struct dma_desc *desc)
315 struct carl9170_tx_superframe *super = get_super(desc);
317 if (unlikely(super->s.assign_seq))
318 wlan_assign_seq(&super->f.data.i3e, super->s.vif_id);
320 if (unlikely(super->s.ampdu_commit_density)) {
321 set(AR9170_MAC_REG_AMPDU_DENSITY,
322 MOD_VAL(AR9170_MAC_AMPDU_DENSITY,
323 get(AR9170_MAC_REG_AMPDU_DENSITY),
324 super->s.ampdu_density));
327 if (unlikely(super->s.ampdu_commit_factor)) {
328 set(AR9170_MAC_REG_AMPDU_FACTOR,
329 MOD_VAL(AR9170_MAC_AMPDU_FACTOR,
330 get(AR9170_MAC_REG_AMPDU_FACTOR),
331 8 << super->s.ampdu_factor));
335 /* propagate transmission status back to the driver */
336 static bool wlan_tx_status(struct dma_queue *queue,
337 struct dma_desc *desc)
339 struct carl9170_tx_superframe *super = get_super(desc);
340 unsigned int qidx = super->s.queue;
341 bool txfail = false, success;
345 /* update hangcheck */
346 fw.wlan.last_super_num[qidx] = 0;
350 * There could be a corner case when the TXFAIL is set
351 * even though the frame was properly ACKed by the peer:
352 * a BlockAckReq with the immediate policy will cause
353 * the receiving peer to produce a BlockACK unfortunately
354 * the MAC in this chip seems to be expecting a legacy
355 * ACK and marks the BAR as failed!
358 if (!!(desc->ctrl & AR9170_CTRL_FAIL)) {
359 txfail = !!(desc->ctrl & AR9170_CTRL_TXFAIL);
361 /* reset retry indicator flags */
362 desc->ctrl &= ~(AR9170_CTRL_TXFAIL | AR9170_CTRL_BAFAIL);
365 * Note: wlan_tx_consume_retry will override the old
366 * phy [CCK,OFDM, HT, BW20/40, MCS...] and mac vectors
367 * [AMPDU,RTS/CTS,...] therefore be careful when they
370 if (wlan_tx_consume_retry(super)) {
372 * retry for simple and aggregated 802.11 frames.
374 * Note: We must not mess up the original frame
378 if (!super->f.hdr.mac.ampdu) {
380 * 802.11 - 7.1.3.1.5.
381 * set "Retry Field" for consecutive attempts
383 * Note: For AMPDU see:
384 * 802.11n 9.9.1.6 "Retransmit Procedures"
386 super->f.data.i3e.frame_control |=
387 cpu_to_le16(IEEE80211_FCTL_RETRY);
391 /* Normal TX Failure */
393 /* demise descriptor ownership back to the hardware */
397 * And this will get the queue going again.
398 * To understand why: you have to get the HW
399 * specs... But sadly I never saw them.
401 wlan_txunstuck(qidx);
403 /* abort cycle - this is necessary due to HW design */
406 /* (HT-) BlockACK failure */
409 * Unlink the failed attempt and put it into
410 * the retry queue. The caller routine must
411 * be aware of this so the frames don't get lost.
414 #ifndef CONFIG_CARL9170FW_DEBUG
415 dma_unlink_head(queue);
416 #else /* CONFIG_CARL9170FW_DEBUG */
417 BUG_ON(dma_unlink_head(queue) != desc);
418 #endif /* CONFIG_CARL9170FW_DEBUG */
419 dma_put(&fw.wlan.tx_retry, desc);
423 /* out of frame attempts - discard frame */
428 #ifndef CONFIG_CARL9170FW_DEBUG
429 dma_unlink_head(queue);
430 #else /* CONFIG_CARL9170FW_DEBUG */
431 BUG_ON(dma_unlink_head(queue) != desc);
432 #endif /* CONFIG_CARL9170FW_DEBUG */
435 * Issue the queue bump,
436 * We need to do this in case this was the frame's last
437 * possible retry attempt and it unfortunately: it failed.
440 wlan_txunstuck(qidx);
445 if (unlikely(super == fw.wlan.fw_desc_data)) {
446 fw.wlan.fw_desc = desc;
447 fw.wlan.fw_desc_available = 1;
449 if (fw.wlan.fw_desc_callback)
450 fw.wlan.fw_desc_callback(super, success);
455 #ifdef CONFIG_CARL9170FW_CAB_QUEUE
456 if (unlikely(super->s.cab))
457 fw.wlan.cab_queue_len[super->s.vif_id]--;
458 #endif /* CONFIG_CARL9170FW_CAB_QUEUE */
460 wlan_tx_complete(super, success);
462 /* recycle freed descriptors */
463 dma_reclaim(&fw.pta.down_queue, desc);
468 static void handle_tx_completion(void)
470 struct dma_desc *desc;
473 for (i = AR9170_TXQ_SPECIAL; i >= AR9170_TXQ0; i--) {
474 __while_desc_bits(desc, &fw.wlan.tx_queue[i], AR9170_OWN_BITS_SW) {
475 if (!wlan_tx_status(&fw.wlan.tx_queue[i], desc)) {
476 /* termination requested. */
481 wlan_tx_ampdu_reset(i);
483 for_each_desc(desc, &fw.wlan.tx_retry)
486 wlan_tx_ampdu_end(i);
487 if (!queue_empty(&fw.wlan.tx_queue[i]))
488 wlan_trigger(BIT(i));
492 void __hot wlan_tx(struct dma_desc *desc)
494 struct carl9170_tx_superframe *super = DESC_PAYLOAD(desc);
496 /* initialize rate control struct */
501 #ifdef CONFIG_CARL9170FW_CAB_QUEUE
502 if (unlikely(super->s.cab)) {
503 fw.wlan.cab_queue_len[super->s.vif_id]++;
504 dma_put(&fw.wlan.cab_queue[super->s.vif_id], desc);
507 #endif /* CONFIG_CARL9170FW_CAB_QUEUE */
511 wlan_trigger(BIT(super->s.queue));
514 void wlan_tx_fw(struct carl9170_tx_superdesc *super, fw_desc_callback_t cb)
516 if (!fw.wlan.fw_desc_available)
519 fw.wlan.fw_desc_available = 0;
521 /* Format BlockAck */
522 fw.wlan.fw_desc->ctrl = AR9170_CTRL_FS_BIT | AR9170_CTRL_LS_BIT;
523 fw.wlan.fw_desc->status = AR9170_OWN_BITS_SW;
525 fw.wlan.fw_desc->totalLen = fw.wlan.fw_desc->dataSize = super->len;
526 fw.wlan.fw_desc_data = fw.wlan.fw_desc->dataAddr = super;
527 fw.wlan.fw_desc->nextAddr = fw.wlan.fw_desc->lastAddr =
529 fw.wlan.fw_desc_callback = cb;
530 wlan_tx(fw.wlan.fw_desc);
533 static void wlan_send_buffered_ba(void)
535 struct carl9170_tx_ba_superframe *baf = &dma_mem.reserved.ba.ba;
536 struct ieee80211_ba *ba = (struct ieee80211_ba *) &baf->f.ba;
537 struct carl9170_bar_ctx *ctx;
539 if (likely(!fw.wlan.queued_ba))
542 /* there's no point to continue when the ba_desc is not available. */
543 if (!fw.wlan.fw_desc_available)
546 ctx = &fw.wlan.ba_cache[fw.wlan.ba_head_idx];
547 fw.wlan.ba_head_idx++;
548 fw.wlan.ba_head_idx %= CONFIG_CARL9170FW_BACK_REQS_NUM;
551 baf->s.len = sizeof(struct carl9170_tx_superdesc) +
552 sizeof(struct ar9170_tx_hwdesc) +
553 sizeof(struct ieee80211_ba);
554 baf->s.ri[0].tries = 1;
556 baf->s.queue = AR9170_TXQ_VO;
557 baf->f.hdr.length = sizeof(struct ieee80211_ba) + FCS_LEN;
559 baf->f.hdr.mac.no_ack = 1;
561 baf->f.hdr.phy.modulation = 1; /* OFDM */
562 baf->f.hdr.phy.tx_power = 34; /* 17 dBm */
563 baf->f.hdr.phy.chains = 1;
564 baf->f.hdr.phy.mcs = AR9170_TXRX_PHY_RATE_OFDM_6M;
566 /* format outgoing BA */
567 ba->frame_control = cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_BACK);
568 ba->duration = cpu_to_le16(0);
569 memcpy(ba->ta, ctx->ta, 6);
570 memcpy(ba->ra, ctx->ra, 6);
573 * Unfortunately, we cannot look into the hardware's scoreboard.
574 * Therefore we have to proceed as described in 802.11n 9.10.7.5
575 * and send a null BlockAck.
577 memset(ba->bitmap, 0x0, sizeof(ba->bitmap));
579 ba->control = ctx->control;
580 ba->start_seq_num = ctx->start_seq_num;
581 wlan_tx_fw(&baf->s, NULL);
584 static struct carl9170_bar_ctx *wlan_get_bar_cache_buffer(void)
586 struct carl9170_bar_ctx *tmp;
588 tmp = &fw.wlan.ba_cache[fw.wlan.ba_tail_idx];
589 fw.wlan.ba_tail_idx++;
590 fw.wlan.ba_tail_idx %= CONFIG_CARL9170FW_BACK_REQS_NUM;
591 if (fw.wlan.queued_ba < CONFIG_CARL9170FW_BACK_REQS_NUM)
597 static void handle_bar(struct dma_desc *desc __unused, struct ieee80211_hdr *hdr,
598 unsigned int len, unsigned int mac_err)
600 struct ieee80211_bar *bar;
601 struct carl9170_bar_ctx *ctx;
603 if (unlikely(mac_err)) {
605 * This check does a number of things:
606 * 1. checks if the frame is in good nick
607 * 2. checks if the RA (MAC) matches
612 if (unlikely(len < (sizeof(struct ieee80211_bar) + FCS_LEN))) {
614 * Sneaky, corrupted BARs... but not with us!
622 if ((bar->control & cpu_to_le16(IEEE80211_BAR_CTRL_MULTI_TID)) ||
623 !(bar->control & cpu_to_le16(IEEE80211_BAR_CTRL_CBMTID_COMPRESSED_BA))) {
624 /* not implemented yet */
629 ctx = wlan_get_bar_cache_buffer();
631 /* Brilliant! The BAR provides all necessary MACs! */
632 memcpy(ctx->ra, bar->ta, 6);
633 memcpy(ctx->ta, bar->ra, 6);
634 ctx->control = bar->control;
635 ctx->start_seq_num = bar->start_seq_num;
638 static void wlan_check_rx_overrun(void)
640 uint32_t overruns, total;
642 fw.tally.rx_total += total = get(AR9170_MAC_REG_RX_TOTAL);
643 fw.tally.rx_overrun += overruns = get(AR9170_MAC_REG_RX_OVERRUN);
644 if (unlikely(overruns)) {
645 if (overruns == total) {
650 wlan_trigger(AR9170_DMA_TRIGGER_RXQ);
654 static unsigned int wlan_rx_filter(struct dma_desc *desc)
656 struct ieee80211_hdr *hdr;
657 unsigned int data_len;
658 unsigned int rx_filter;
659 unsigned int mac_err;
661 data_len = ar9170_get_rx_mpdu_len(desc);
662 mac_err = ar9170_get_rx_macstatus_error(desc);
664 #define AR9170_RX_ERROR_BAD (AR9170_RX_ERROR_FCS | AR9170_RX_ERROR_PLCP)
666 if (unlikely(data_len < (4 + 6 + FCS_LEN) ||
667 desc->totalLen > CONFIG_CARL9170FW_RX_FRAME_LEN) ||
668 mac_err & AR9170_RX_ERROR_BAD) {
670 * This frame is too damaged to do anything
674 return CARL9170_RX_FILTER_BAD;
678 if (mac_err & AR9170_RX_ERROR_WRONG_RA)
679 rx_filter |= CARL9170_RX_FILTER_OTHER_RA;
681 if (mac_err & AR9170_RX_ERROR_DECRYPT)
682 rx_filter |= CARL9170_RX_FILTER_DECRY_FAIL;
684 hdr = ar9170_get_rx_i3e(desc);
685 if (likely(ieee80211_is_data(hdr->frame_control))) {
686 rx_filter |= CARL9170_RX_FILTER_DATA;
687 } else if (ieee80211_is_ctl(hdr->frame_control)) {
688 switch (le16_to_cpu(hdr->frame_control) & IEEE80211_FCTL_STYPE) {
689 case IEEE80211_STYPE_BACK_REQ:
690 handle_bar(desc, hdr, data_len, mac_err);
692 rx_filter |= CARL9170_RX_FILTER_CTL_BACKR;
694 case IEEE80211_STYPE_PSPOLL:
695 rx_filter |= CARL9170_RX_FILTER_CTL_PSPOLL;
698 rx_filter |= CARL9170_RX_FILTER_CTL_OTHER;
702 /* ieee80211_is_mgmt */
703 rx_filter |= CARL9170_RX_FILTER_MGMT;
706 if (unlikely(fw.suspend_mode == CARL9170_HOST_SUSPENDED)) {
707 wol_rx(rx_filter, hdr, min(data_len,
708 (unsigned int)AR9170_BLOCK_SIZE));
711 #undef AR9170_RX_ERROR_BAD
716 static void handle_rx(void)
718 struct dma_desc *desc;
720 for_each_desc_not_bits(desc, &fw.wlan.rx_queue, AR9170_OWN_BITS_HW) {
721 if (!(wlan_rx_filter(desc) & fw.wlan.rx_filter)) {
722 dma_put(&fw.pta.up_queue, desc);
725 dma_reclaim(&fw.wlan.rx_queue, desc);
726 wlan_trigger(AR9170_DMA_TRIGGER_RXQ);
731 #ifdef CONFIG_CARL9170FW_CAB_QUEUE
732 void wlan_cab_flush_queue(const unsigned int vif)
734 struct dma_queue *cab_queue = &fw.wlan.cab_queue[vif];
735 struct dma_desc *desc;
737 /* move queued frames into the main tx queues */
738 for_each_desc(desc, cab_queue) {
739 struct carl9170_tx_superframe *super = get_super(desc);
740 if (!queue_empty(cab_queue)) {
742 * Set MOREDATA flag for all,
743 * but the last queued frame.
744 * see: 802.11-2007 11.2.1.5 f)
746 * This is actually the reason to why
747 * we need to prevent the reentry.
750 super->f.data.i3e.frame_control |=
751 cpu_to_le16(IEEE80211_FCTL_MOREDATA);
753 super->f.data.i3e.frame_control &=
754 cpu_to_le16(~IEEE80211_FCTL_MOREDATA);
760 wlan_trigger(BIT(super->s.queue));
764 static uint8_t *beacon_find_ie(uint8_t ie, void *addr,
765 const unsigned int len)
767 struct ieee80211_mgmt *mgmt = addr;
770 pos = mgmt->u.beacon.variable;
771 end = (uint8_t *) ((unsigned long)mgmt + (len - FCS_LEN));
773 if (pos + 2 + pos[1] > end)
785 void wlan_modify_beacon(const unsigned int vif,
786 const unsigned int addr, const unsigned int len)
789 struct ieee80211_tim_ie *ie;
791 _ie = beacon_find_ie(WLAN_EID_TIM, (void *)addr, len);
793 ie = (struct ieee80211_tim_ie *) &_ie[2];
795 if (!queue_empty(&fw.wlan.cab_queue[vif]) && (ie->dtim_count == 0)) {
796 /* schedule DTIM transfer */
797 fw.wlan.cab_flush_trigger[vif] = CARL9170_CAB_TRIGGER_ARMED;
798 } else if ((fw.wlan.cab_queue_len[vif] == 0) && (fw.wlan.cab_flush_trigger[vif])) {
799 /* undo all chances to the beacon structure */
800 ie->bitmap_ctrl &= ~0x1;
801 fw.wlan.cab_flush_trigger[vif] = CARL9170_CAB_TRIGGER_EMPTY;
804 /* Triggered by CARL9170_CAB_TRIGGER_ARMED || CARL9170_CAB_TRIGGER_DEFER */
805 if (fw.wlan.cab_flush_trigger[vif]) {
806 /* Set the almighty Multicast Traffic Indication Bit. */
807 ie->bitmap_ctrl |= 0x1;
812 * Ideally, the sequence number should be assigned by the TX arbiter
813 * hardware. But AFAIK that's not possible, so we have to go for the
814 * next best thing and write it into the beacon fifo during the open
815 * beacon update window.
818 wlan_assign_seq((struct ieee80211_hdr *)addr, vif);
821 static void wlan_send_buffered_cab(void)
825 for (i = 0; i < CARL9170_INTF_NUM; i++) {
826 if (unlikely(fw.wlan.cab_flush_trigger[i] == CARL9170_CAB_TRIGGER_ARMED)) {
828 * This is hardcoded into carl9170usb driver.
830 * The driver must set the PRETBTT event to beacon_interval -
831 * CARL9170_PRETBTT_KUS (usually 6) Kus.
833 * But still, we can only do so much about 802.11-2007 9.3.2.1 &
834 * 11.2.1.6. Let's hope the current solution is adequate enough.
837 if (is_after_msecs(fw.wlan.cab_flush_time, (CARL9170_TBTT_DELTA))) {
838 wlan_cab_flush_queue(i);
841 * This prevents the code from sending new BC/MC frames
842 * which were queued after the previous buffered traffic
843 * has been sent out... They will have to wait until the
844 * next DTIM beacon comes along.
846 fw.wlan.cab_flush_trigger[i] = CARL9170_CAB_TRIGGER_DEFER;
852 #endif /* CONFIG_CARL9170FW_CAB_QUEUE */
854 static void handle_beacon_config(void)
858 bcn_count = get(AR9170_MAC_REG_BCN_COUNT);
859 send_cmd_to_host(4, CARL9170_RSP_BEACON_CONFIG, 0x00,
860 (uint8_t *) &bcn_count);
863 static void handle_pretbtt(void)
865 #ifdef CONFIG_CARL9170FW_CAB_QUEUE
866 fw.wlan.cab_flush_time = get_clock_counter();
867 #endif /* CONFIG_CARL9170FW_CAB_QUEUE */
869 #ifdef CONFIG_CARL9170FW_RADIO_FUNCTIONS
872 send_cmd_to_host(4, CARL9170_RSP_PRETBTT, 0x00,
873 (uint8_t *) &fw.phy.psm.state);
874 #endif /* CONFIG_CARL9170FW_RADIO_FUNCTIONS */
877 static void handle_atim(void)
879 send_cmd_to_host(0, CARL9170_RSP_ATIM, 0x00, NULL);
882 #ifdef CONFIG_CARL9170FW_DEBUG
883 static void handle_qos(void)
886 * What is the QoS Bit used for?
887 * Is it only an indicator for TXOP & Burst, or
888 * should we do something here?
892 static void handle_radar(void)
894 send_cmd_to_host(0, CARL9170_RSP_RADAR, 0x00, NULL);
896 #endif /* CONFIG_CARL9170FW_DEBUG */
898 static void wlan_janitor(void)
900 #ifdef CONFIG_CARL9170FW_CAB_QUEUE
901 wlan_send_buffered_cab();
902 #endif /* CONFIG_CARL9170FW_CAB_QUEUE */
904 wlan_send_buffered_tx_status();
906 wlan_send_buffered_ba();
911 void handle_wlan(void)
915 intr = get(AR9170_MAC_REG_INT_CTRL);
917 set(AR9170_MAC_REG_INT_CTRL, intr);
919 #define HANDLER(intr, flag, func) \
921 if ((intr & flag) != 0) { \
926 intr |= fw.wlan.soft_int;
927 fw.wlan.soft_int = 0;
929 HANDLER(intr, AR9170_MAC_INT_PRETBTT, handle_pretbtt);
931 HANDLER(intr, AR9170_MAC_INT_ATIM, handle_atim);
933 HANDLER(intr, AR9170_MAC_INT_RXC, handle_rx);
935 HANDLER(intr, (AR9170_MAC_INT_TXC | AR9170_MAC_INT_RETRY_FAIL),
936 handle_tx_completion);
938 #ifdef CONFIG_CARL9170FW_DEBUG
939 HANDLER(intr, AR9170_MAC_INT_QOS, handle_qos);
941 HANDLER(intr, AR9170_MAC_INT_RADAR, handle_radar);
942 #endif /* CONFIG_CARL9170FW_DEBUG */
944 HANDLER(intr, AR9170_MAC_INT_CFG_BCN, handle_beacon_config);
947 DBG("Unhandled Interrupt %x\n", (unsigned int) intr);
955 CARL9170FW_TX_MAC_BUMP = 4,
956 CARL9170FW_TX_MAC_DEBUG = 6,
957 CARL9170FW_TX_MAC_RESET = 7,
960 static void wlan_check_hang(void)
962 struct dma_desc *desc;
965 for (i = AR9170_TXQ_SPECIAL; i >= AR9170_TXQ0; i--) {
966 if (queue_empty(&fw.wlan.tx_queue[i])) {
967 /* Nothing to do here... move along */
971 /* fetch the current DMA queue position */
972 desc = (struct dma_desc *)get_wlan_txq_addr(i);
974 /* Stuck frame detection */
975 if (unlikely(DESC_PAYLOAD(desc) == fw.wlan.last_super[i])) {
976 fw.wlan.last_super_num[i]++;
978 if (unlikely(fw.wlan.last_super_num[i] >= CARL9170FW_TX_MAC_RESET)) {
980 * schedule MAC reset (aka OFF/ON => dead)
982 * This will almost certainly kill
983 * the device for good, but it's the
984 * recommended thing to do...
990 #ifdef CONFIG_CARL9170FW_DEBUG
991 if (unlikely(fw.wlan.last_super_num[i] >= CARL9170FW_TX_MAC_DEBUG)) {
993 * Sigh, the queue is almost certainly
994 * dead. Dump the queue content to the
995 * user, maybe we find out why it got
1001 #endif /* CONFIG_CARL9170FW_DEBUG */
1003 #ifdef CONFIG_CARL9170FW_DMA_QUEUE_BUMP
1004 if (unlikely(fw.wlan.last_super_num[i] >= CARL9170FW_TX_MAC_BUMP)) {
1006 * Hrrm, bump the queue a bit.
1007 * maybe this will get it going again.
1011 wlan_trigger(BIT(i));
1013 #endif /* CONFIG_CARL9170FW_DMA_QUEUE_BUMP */
1016 fw.wlan.last_super[i] = DESC_PAYLOAD(desc);
1017 fw.wlan.last_super_num[i] = 0;
1022 #ifdef CONFIG_CARL9170FW_FW_MAC_RESET
1024 * NB: Resetting the MAC is a two-edged sword.
1025 * On most occasions, it does what it is supposed to do.
1026 * But there is a chance that this will make it
1027 * even worse and the radio dies silently.
1029 static void wlan_mac_reset(void)
1032 uint32_t agg_wait_counter;
1033 uint32_t agg_density;
1034 uint32_t bcn_start_addr;
1035 uint32_t rctl, rcth;
1038 uint32_t rts_cts_tpc;
1039 uint32_t rts_cts_rate;
1042 #ifdef CONFIG_CARL9170FW_RADIO_FUNCTIONS
1044 #endif /* CONFIG_CARL9170FW_RADIO_FUNCTIONS */
1046 #ifdef CONFIG_CARL9170FW_NOISY_MAC_RESET
1048 #endif /* CONFIG_CARL9170FW_NOISY_MAC_RESET */
1050 /* Save aggregation parameters */
1051 agg_wait_counter = get(AR9170_MAC_REG_AMPDU_FACTOR);
1052 agg_density = get(AR9170_MAC_REG_AMPDU_DENSITY);
1054 bcn_start_addr = get(AR9170_MAC_REG_BCN_ADDR);
1056 cam_mode = get(AR9170_MAC_REG_CAM_MODE);
1057 rctl = get(AR9170_MAC_REG_CAM_ROLL_CALL_TBL_L);
1058 rcth = get(AR9170_MAC_REG_CAM_ROLL_CALL_TBL_H);
1060 ack_power = get(AR9170_MAC_REG_ACK_TPC);
1061 rts_cts_tpc = get(AR9170_MAC_REG_RTS_CTS_TPC);
1062 rts_cts_rate = get(AR9170_MAC_REG_RTS_CTS_RATE);
1064 #ifdef CONFIG_CARL9170FW_RADIO_FUNCTIONS
1065 /* 0x1c8960 write only */
1066 rx_BB = get(AR9170_PHY_REG_SWITCH_CHAIN_0);
1067 #endif /* CONFIG_CARL9170FW_RADIO_FUNCTIONS */
1069 /* TX/RX must be stopped by now */
1070 val = get(AR9170_MAC_REG_POWER_STATE_CTRL);
1072 val |= AR9170_MAC_POWER_STATE_CTRL_RESET;
1075 * Manipulate CCA threshold to stop transmission
1077 * set(AR9170_PHY_REG_CCA_THRESHOLD, 0x300);
1081 * check Rx state in 0(idle) 9(disable)
1083 * chState = (get(AR9170_MAC_REG_MISC_684) >> 16) & 0xf;
1084 * while( (chState != 0) && (chState != 9)) {
1085 * chState = (get(AR9170_MAC_REG_MISC_684) >> 16) & 0xf;
1089 set(AR9170_MAC_REG_POWER_STATE_CTRL, val);
1093 /* Restore aggregation parameters */
1094 set(AR9170_MAC_REG_AMPDU_FACTOR, agg_wait_counter);
1095 set(AR9170_MAC_REG_AMPDU_DENSITY, agg_density);
1097 set(AR9170_MAC_REG_BCN_ADDR, bcn_start_addr);
1098 set(AR9170_MAC_REG_CAM_MODE, cam_mode);
1099 set(AR9170_MAC_REG_CAM_ROLL_CALL_TBL_L, rctl);
1100 set(AR9170_MAC_REG_CAM_ROLL_CALL_TBL_H, rcth);
1102 set(AR9170_MAC_REG_RTS_CTS_TPC, rts_cts_tpc);
1103 set(AR9170_MAC_REG_ACK_TPC, ack_power);
1104 set(AR9170_MAC_REG_RTS_CTS_RATE, rts_cts_rate);
1106 #ifdef CONFIG_CARL9170FW_RADIO_FUNCTIONS
1107 set(AR9170_PHY_REG_SWITCH_CHAIN_2, rx_BB);
1108 #endif /* CONFIG_CARL9170FW_RADIO_FUNCTIONS */
1111 * Manipulate CCA threshold to resume transmission
1113 * set(AR9170_PHY_REG_CCA_THRESHOLD, 0x0);
1116 val = AR9170_DMA_TRIGGER_RXQ;
1117 /* Reinitialize all WLAN TX DMA queues. */
1118 for (i = AR9170_TXQ_SPECIAL; i >= AR9170_TXQ0; i--) {
1119 struct dma_desc *iter;
1121 __for_each_desc_bits(iter, &fw.wlan.tx_queue[i], AR9170_OWN_BITS_SW);
1123 /* kill the stuck frame */
1124 if (!is_terminator(&fw.wlan.tx_queue[i], iter) &&
1125 fw.wlan.last_super_num[i] >= CARL9170FW_TX_MAC_RESET &&
1126 fw.wlan.last_super[i] == DESC_PAYLOAD(iter)) {
1127 struct carl9170_tx_superframe *super = get_super(iter);
1129 iter->status = AR9170_OWN_BITS_SW;
1131 * Mark the frame as failed.
1132 * The BAFAIL flag allows the frame to sail through
1133 * wlan_tx_status without much "unstuck" trouble.
1135 iter->ctrl &= ~(AR9170_CTRL_FAIL);
1136 iter->ctrl |= AR9170_CTRL_BAFAIL;
1138 super->s.cnt = CARL9170_TX_MAX_RATE_TRIES;
1139 super->s.rix = CARL9170_TX_MAX_RETRY_RATES;
1141 fw.wlan.last_super_num[i] = 0;
1142 fw.wlan.last_super[i] = NULL;
1143 iter = iter->lastAddr->nextAddr;
1146 set_wlan_txq_dma_addr(i, (uint32_t) iter);
1147 if (!is_terminator(&fw.wlan.tx_queue[i], iter))
1150 DBG("Q:%d l:%d h:%p t:%p cu:%p it:%p ct:%x st:%x\n", i, queue_len(&fw.wlan.tx_queue[i]),
1151 fw.wlan.tx_queue[i].head, fw.wlan.tx_queue[i].terminator,
1152 get_wlan_txq_addr(i), iter, iter->ctrl, iter->status);
1155 fw.wlan.soft_int |= AR9170_MAC_INT_RXC | AR9170_MAC_INT_TXC |
1156 AR9170_MAC_INT_RETRY_FAIL;
1158 set(AR9170_MAC_REG_DMA_RXQ_ADDR, (uint32_t) fw.wlan.rx_queue.head);
1162 static void wlan_mac_reset(void)
1164 /* The driver takes care of reinitializing the device */
1167 #endif /* CONFIG_CARL9170FW_FW_MAC_RESET */
1169 void __cold wlan_timer(void)
1171 unsigned int cached_mac_reset;
1173 cached_mac_reset = fw.wlan.mac_reset;
1175 /* TX Queue Hang check */
1178 /* RX Overrun check */
1179 wlan_check_rx_overrun();
1181 if (unlikely(fw.wlan.mac_reset >= CARL9170_MAC_RESET_RESET)) {
1183 fw.wlan.mac_reset = CARL9170_MAC_RESET_OFF;
1185 if (fw.wlan.mac_reset && cached_mac_reset == fw.wlan.mac_reset)
1186 fw.wlan.mac_reset--;