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Diffstat (limited to '')
| -rw-r--r-- | carl9170fw/carlfw/src/wlan.c | 1211 |
1 files changed, 1211 insertions, 0 deletions
diff --git a/carl9170fw/carlfw/src/wlan.c b/carl9170fw/carlfw/src/wlan.c new file mode 100644 index 0000000..d3328d6 --- /dev/null +++ b/carl9170fw/carlfw/src/wlan.c @@ -0,0 +1,1211 @@ +/* + * carl9170 firmware - used by the ar9170 wireless device + * + * Interface to the WLAN part of the chip + * + * Copyright (c) 2000-2005 ZyDAS Technology Corporation + * Copyright (c) 2007-2009 Atheros Communications, Inc. + * Copyright 2009 Johannes Berg <johannes@sipsolutions.net> + * Copyright 2009-2011 Christian Lamparter <chunkeey@googlemail.com> + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License along + * with this program; if not, write to the Free Software Foundation, Inc., + * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. + */ + +#include "carl9170.h" +#include "shared/phy.h" +#include "hostif.h" +#include "timer.h" +#include "wl.h" +#include "printf.h" +#include "rf.h" +#include "linux/ieee80211.h" +#include "wol.h" + +static void wlan_txunstuck(unsigned int queue) +{ + set_wlan_txq_dma_addr(queue, ((uint32_t) fw.wlan.tx_queue[queue].head) | 1); +} + +#ifdef CONFIG_CARL9170FW_DMA_QUEUE_BUMP +static void wlan_txupdate(unsigned int queue) +{ + set_wlan_txq_dma_addr(queue, ((uint32_t) fw.wlan.tx_queue[queue].head)); +} + +static void wlan_dma_bump(unsigned int qidx) +{ + unsigned int offset = qidx; + uint32_t status, trigger; + + status = get(AR9170_MAC_REG_DMA_STATUS) >> 12; + trigger = get(AR9170_MAC_REG_DMA_TRIGGER) >> 12; + + while (offset != 0) { + status >>= 4; + trigger >>= 4; + offset--; + } + + status &= 0xf; + trigger &= 0xf; + + if ((trigger == 0xa) && (status == 0x8)) { + DBG("UNSTUCK"); + wlan_txunstuck(qidx); + } else { + DBG("UPDATE"); + wlan_txupdate(qidx); + } +} +#endif /* CONFIG_CARL9170FW_DMA_QUEUE_BUMP */ + +#ifdef CONFIG_CARL9170FW_DEBUG +static void wlan_dump_queue(unsigned int qidx) +{ + + struct dma_desc *desc; + struct carl9170_tx_superframe *super; + int entries = 0; + + __for_each_desc(desc, &fw.wlan.tx_queue[qidx]) { + super = get_super(desc); + DBG("%d: %p s:%x c:%x tl:%x ds:%x n:%p l:%p ", entries, desc, + desc->status, desc->ctrl, desc->totalLen, + desc->dataSize, desc->nextAddr, desc->lastAddr); + + DBG("c:%x tr:%d ri:%d l:%x m:%x p:%x fc:%x", + super->s.cookie, super->s.cnt, super->s.rix, + super->f.hdr.length, super->f.hdr.mac.set, + (unsigned int) le32_to_cpu(super->f.hdr.phy.set), + super->f.data.i3e.frame_control); + + entries++; + } + + desc = get_wlan_txq_addr(qidx); + + DBG("Queue: %d: te:%d td:%d h:%p c:%p t:%p", + qidx, entries, queue_len(&fw.wlan.tx_queue[qidx]), + fw.wlan.tx_queue[qidx].head, + desc, fw.wlan.tx_queue[qidx].terminator); + + DBG("HW: t:%x s:%x ac:%x c:%x", + (unsigned int) get(AR9170_MAC_REG_DMA_TRIGGER), + (unsigned int) get(AR9170_MAC_REG_DMA_STATUS), + (unsigned int) get(AR9170_MAC_REG_AMPDU_COUNT), + (unsigned int) get(AR9170_MAC_REG_DMA_TXQX_ADDR_CURR)); +} +#endif /* CONFIG_CARL9170FW_DEBUG */ + +static void wlan_send_buffered_tx_status(void) +{ + unsigned int len; + + while (fw.wlan.tx_status_pending) { + len = min((unsigned int)fw.wlan.tx_status_pending, + CARL9170_RSP_TX_STATUS_NUM); + len = min(len, CARL9170_TX_STATUS_NUM - fw.wlan.tx_status_head_idx); + + /* + * rather than memcpy each individual request into a large buffer, + * we _splice_ them all together. + * + * The only downside is however that we have to be careful around + * the edges of the tx_status_cache. + * + * Note: + * Each tx_status is about 2 bytes. However every command package + * must have a size which is a multiple of 4. + */ + + send_cmd_to_host((len * sizeof(struct carl9170_tx_status) + 3) & ~3, + CARL9170_RSP_TXCOMP, len, (void *) + &fw.wlan.tx_status_cache[fw.wlan.tx_status_head_idx]); + + fw.wlan.tx_status_pending -= len; + fw.wlan.tx_status_head_idx += len; + fw.wlan.tx_status_head_idx %= CARL9170_TX_STATUS_NUM; + } +} + +static struct carl9170_tx_status *wlan_get_tx_status_buffer(void) +{ + struct carl9170_tx_status *tmp; + + tmp = &fw.wlan.tx_status_cache[fw.wlan.tx_status_tail_idx++]; + fw.wlan.tx_status_tail_idx %= CARL9170_TX_STATUS_NUM; + + if (fw.wlan.tx_status_pending == CARL9170_TX_STATUS_NUM) + wlan_send_buffered_tx_status(); + + fw.wlan.tx_status_pending++; + + return tmp; +} + +/* generate _aggregated_ tx_status for the host */ +void wlan_tx_complete(struct carl9170_tx_superframe *super, + bool txs) +{ + struct carl9170_tx_status *status; + + status = wlan_get_tx_status_buffer(); + + /* + * The *unique* cookie and AC_ID is used by the driver for + * frame lookup. + */ + status->cookie = super->s.cookie; + status->queue = super->s.queue; + super->s.cookie = 0; + + /* + * This field holds the number of tries of the rate in + * the rate index field (rix). + */ + status->rix = super->s.rix; + status->tries = super->s.cnt; + status->success = (txs) ? 1 : 0; +} + +static bool wlan_tx_consume_retry(struct carl9170_tx_superframe *super) +{ + /* check if this was the last possible retry with this rate */ + if (unlikely(super->s.cnt >= super->s.ri[super->s.rix].tries)) { + /* end of the road - indicate tx failure */ + if (unlikely(super->s.rix == CARL9170_TX_MAX_RETRY_RATES)) + return false; + + /* check if there are alternative rates available */ + if (!super->s.rr[super->s.rix].set) + return false; + + /* try next retry rate */ + super->f.hdr.phy.set = super->s.rr[super->s.rix].set; + + /* finally - mark the old rate as USED */ + super->s.rix++; + + /* update MAC flags */ + super->f.hdr.mac.erp_prot = super->s.ri[super->s.rix].erp_prot; + super->f.hdr.mac.ampdu = super->s.ri[super->s.rix].ampdu; + + /* reinitialize try counter */ + super->s.cnt = 1; + } else { + /* just increase retry counter */ + super->s.cnt++; + } + + return true; +} + +static inline u16 get_tid(struct ieee80211_hdr *hdr) +{ + return (ieee80211_get_qos_ctl(hdr))[0] & IEEE80211_QOS_CTL_TID_MASK; +} + +/* This function will only work on uint32_t-aligned pointers! */ +static bool same_hdr(const void *_d0, const void *_d1) +{ + const uint32_t *d0 = _d0; + const uint32_t *d1 = _d1; + + /* BUG_ON((unsigned long)d0 & 3 || (unsigned long)d1 & 3)) */ + return !((d0[0] ^ d1[0]) | /* FC + DU */ + (d0[1] ^ d1[1]) | /* addr1 */ + (d0[2] ^ d1[2]) | (d0[3] ^ d1[3]) | /* addr2 + addr3 */ + (d0[4] ^ d1[4])); /* addr3 */ +} + +static inline bool same_aggr(struct ieee80211_hdr *a, struct ieee80211_hdr *b) +{ + return (get_tid(a) == get_tid(b)) || same_hdr(a, b); +} + +static void wlan_tx_ampdu_reset(unsigned int qidx) +{ + fw.wlan.ampdu_prev[qidx] = NULL; +} + +static void wlan_tx_ampdu_end(unsigned int qidx) +{ + struct carl9170_tx_superframe *ht_prev = fw.wlan.ampdu_prev[qidx]; + + if (ht_prev) + ht_prev->f.hdr.mac.ba_end = 1; + + wlan_tx_ampdu_reset(qidx); +} + +static void wlan_tx_ampdu(struct carl9170_tx_superframe *super) +{ + unsigned int qidx = super->s.queue; + struct carl9170_tx_superframe *ht_prev = fw.wlan.ampdu_prev[qidx]; + + if (super->f.hdr.mac.ampdu) { + if (ht_prev && + !same_aggr(&super->f.data.i3e, &ht_prev->f.data.i3e)) + ht_prev->f.hdr.mac.ba_end = 1; + else + super->f.hdr.mac.ba_end = 0; + + fw.wlan.ampdu_prev[qidx] = super; + } else { + wlan_tx_ampdu_end(qidx); + } +} + +/* for all tries */ +static void __wlan_tx(struct dma_desc *desc) +{ + struct carl9170_tx_superframe *super = get_super(desc); + + if (unlikely(super->s.fill_in_tsf)) { + struct ieee80211_mgmt *mgmt = (void *) &super->f.data.i3e; + uint32_t *tsf = (uint32_t *) &mgmt->u.probe_resp.timestamp; + + /* + * Truth be told: this is a hack. + * + * The *real* TSF is definitely going to be higher/older. + * But this hardware emulation code is head and shoulders + * above anything a driver can possibly do. + * + * (even, if it's got an accurate atomic clock source). + */ + + read_tsf(tsf); + } + + wlan_tx_ampdu(super); + +#ifdef CONFIG_CARL9170FW_DEBUG + BUG_ON(fw.phy.psm.state != CARL9170_PSM_WAKE); +#endif /* CONFIG_CARL9170FW_DEBUG */ + + /* insert desc into the right queue */ + dma_put(&fw.wlan.tx_queue[super->s.queue], desc); +} + +static void wlan_assign_seq(struct ieee80211_hdr *hdr, unsigned int vif) +{ + hdr->seq_ctrl &= cpu_to_le16(~IEEE80211_SCTL_SEQ); + hdr->seq_ctrl |= cpu_to_le16(fw.wlan.sequence[vif]); + + if (ieee80211_is_first_frag(hdr->seq_ctrl)) + fw.wlan.sequence[vif] += 0x10; +} + +/* prepares frame for the first transmission */ +static void _wlan_tx(struct dma_desc *desc) +{ + struct carl9170_tx_superframe *super = get_super(desc); + + if (unlikely(super->s.assign_seq)) + wlan_assign_seq(&super->f.data.i3e, super->s.vif_id); + + if (unlikely(super->s.ampdu_commit_density)) { + set(AR9170_MAC_REG_AMPDU_DENSITY, + MOD_VAL(AR9170_MAC_AMPDU_DENSITY, + get(AR9170_MAC_REG_AMPDU_DENSITY), + super->s.ampdu_density)); + } + + if (unlikely(super->s.ampdu_commit_factor)) { + set(AR9170_MAC_REG_AMPDU_FACTOR, + MOD_VAL(AR9170_MAC_AMPDU_FACTOR, + get(AR9170_MAC_REG_AMPDU_FACTOR), + 8 << super->s.ampdu_factor)); + } +} + +/* propagate transmission status back to the driver */ +static bool wlan_tx_status(struct dma_queue *queue, + struct dma_desc *desc) +{ + struct carl9170_tx_superframe *super = get_super(desc); + unsigned int qidx = super->s.queue; + bool txfail = false, success; + + success = true; + + /* update hangcheck */ + fw.wlan.last_super_num[qidx] = 0; + + /* + * Note: + * There could be a corner case when the TXFAIL is set + * even though the frame was properly ACKed by the peer: + * a BlockAckReq with the immediate policy will cause + * the receiving peer to produce a BlockACK unfortunately + * the MAC in this chip seems to be expecting a legacy + * ACK and marks the BAR as failed! + */ + + if (!!(desc->ctrl & AR9170_CTRL_FAIL)) { + txfail = !!(desc->ctrl & AR9170_CTRL_TXFAIL); + + /* reset retry indicator flags */ + desc->ctrl &= ~(AR9170_CTRL_TXFAIL | AR9170_CTRL_BAFAIL); + + /* + * Note: wlan_tx_consume_retry will override the old + * phy [CCK,OFDM, HT, BW20/40, MCS...] and mac vectors + * [AMPDU,RTS/CTS,...] therefore be careful when they + * are used. + */ + if (wlan_tx_consume_retry(super)) { + /* + * retry for simple and aggregated 802.11 frames. + * + * Note: We must not mess up the original frame + * order. + */ + + if (!super->f.hdr.mac.ampdu) { + /* + * 802.11 - 7.1.3.1.5. + * set "Retry Field" for consecutive attempts + * + * Note: For AMPDU see: + * 802.11n 9.9.1.6 "Retransmit Procedures" + */ + super->f.data.i3e.frame_control |= + cpu_to_le16(IEEE80211_FCTL_RETRY); + } + + if (txfail) { + /* Normal TX Failure */ + + /* demise descriptor ownership back to the hardware */ + dma_rearm(desc); + + /* + * And this will get the queue going again. + * To understand why: you have to get the HW + * specs... But sadly I never saw them. + */ + wlan_txunstuck(qidx); + + /* abort cycle - this is necessary due to HW design */ + return false; + } else { + /* (HT-) BlockACK failure */ + + /* + * Unlink the failed attempt and put it into + * the retry queue. The caller routine must + * be aware of this so the frames don't get lost. + */ + +#ifndef CONFIG_CARL9170FW_DEBUG + dma_unlink_head(queue); +#else /* CONFIG_CARL9170FW_DEBUG */ + BUG_ON(dma_unlink_head(queue) != desc); +#endif /* CONFIG_CARL9170FW_DEBUG */ + dma_put(&fw.wlan.tx_retry, desc); + return true; + } + } else { + /* out of frame attempts - discard frame */ + success = false; + } + } + +#ifndef CONFIG_CARL9170FW_DEBUG + dma_unlink_head(queue); +#else /* CONFIG_CARL9170FW_DEBUG */ + BUG_ON(dma_unlink_head(queue) != desc); +#endif /* CONFIG_CARL9170FW_DEBUG */ + if (txfail) { + /* + * Issue the queue bump, + * We need to do this in case this was the frame's last + * possible retry attempt and it unfortunately: it failed. + */ + + wlan_txunstuck(qidx); + } + + unhide_super(desc); + + if (unlikely(super == fw.wlan.fw_desc_data)) { + fw.wlan.fw_desc = desc; + fw.wlan.fw_desc_available = 1; + + if (fw.wlan.fw_desc_callback) + fw.wlan.fw_desc_callback(super, success); + + return true; + } + +#ifdef CONFIG_CARL9170FW_CAB_QUEUE + if (unlikely(super->s.cab)) + fw.wlan.cab_queue_len[super->s.vif_id]--; +#endif /* CONFIG_CARL9170FW_CAB_QUEUE */ + + wlan_tx_complete(super, success); + + if (ieee80211_is_back_req(super->f.data.i3e.frame_control)) { + fw.wlan.queued_bar--; + } + + /* recycle freed descriptors */ + dma_reclaim(&fw.pta.down_queue, desc); + down_trigger(); + return true; +} + +static void handle_tx_completion(void) +{ + struct dma_desc *desc; + int i; + + for (i = AR9170_TXQ_SPECIAL; i >= AR9170_TXQ0; i--) { + __while_desc_bits(desc, &fw.wlan.tx_queue[i], AR9170_OWN_BITS_SW) { + if (!wlan_tx_status(&fw.wlan.tx_queue[i], desc)) { + /* termination requested. */ + break; + } + } + + wlan_tx_ampdu_reset(i); + + for_each_desc(desc, &fw.wlan.tx_retry) + __wlan_tx(desc); + + wlan_tx_ampdu_end(i); + if (!queue_empty(&fw.wlan.tx_queue[i])) + wlan_trigger(BIT(i)); + } +} + +void __hot wlan_tx(struct dma_desc *desc) +{ + struct carl9170_tx_superframe *super = DESC_PAYLOAD(desc); + + if (ieee80211_is_back_req(super->f.data.i3e.frame_control)) { + fw.wlan.queued_bar++; + } + + /* initialize rate control struct */ + super->s.rix = 0; + super->s.cnt = 1; + hide_super(desc); + +#ifdef CONFIG_CARL9170FW_CAB_QUEUE + if (unlikely(super->s.cab)) { + fw.wlan.cab_queue_len[super->s.vif_id]++; + dma_put(&fw.wlan.cab_queue[super->s.vif_id], desc); + return; + } +#endif /* CONFIG_CARL9170FW_CAB_QUEUE */ + + _wlan_tx(desc); + __wlan_tx(desc); + wlan_trigger(BIT(super->s.queue)); +} + +void wlan_tx_fw(struct carl9170_tx_superdesc *super, fw_desc_callback_t cb) +{ + if (!fw.wlan.fw_desc_available) + return; + + fw.wlan.fw_desc_available = 0; + + /* Format BlockAck */ + fw.wlan.fw_desc->ctrl = AR9170_CTRL_FS_BIT | AR9170_CTRL_LS_BIT; + fw.wlan.fw_desc->status = AR9170_OWN_BITS_SW; + + fw.wlan.fw_desc->totalLen = fw.wlan.fw_desc->dataSize = super->len; + fw.wlan.fw_desc_data = fw.wlan.fw_desc->dataAddr = super; + fw.wlan.fw_desc->nextAddr = fw.wlan.fw_desc->lastAddr = + fw.wlan.fw_desc; + fw.wlan.fw_desc_callback = cb; + wlan_tx(fw.wlan.fw_desc); +} + +static void wlan_send_buffered_ba(void) +{ + struct carl9170_tx_ba_superframe *baf = &dma_mem.reserved.ba.ba; + struct ieee80211_ba *ba = (struct ieee80211_ba *) &baf->f.ba; + struct carl9170_bar_ctx *ctx; + + if (likely(!fw.wlan.queued_ba)) + return; + + /* there's no point to continue when the ba_desc is not available. */ + if (!fw.wlan.fw_desc_available) + return; + + ctx = &fw.wlan.ba_cache[fw.wlan.ba_head_idx]; + fw.wlan.ba_head_idx++; + fw.wlan.ba_head_idx %= CONFIG_CARL9170FW_BACK_REQS_NUM; + fw.wlan.queued_ba--; + + baf->s.len = sizeof(struct carl9170_tx_superdesc) + + sizeof(struct ar9170_tx_hwdesc) + + sizeof(struct ieee80211_ba); + baf->s.ri[0].tries = 1; + baf->s.cookie = 0; + baf->s.queue = AR9170_TXQ_VO; + baf->f.hdr.length = sizeof(struct ieee80211_ba) + FCS_LEN; + + baf->f.hdr.mac.no_ack = 1; + + baf->f.hdr.phy.modulation = 1; /* OFDM */ + baf->f.hdr.phy.tx_power = 34; /* 17 dBm */ + baf->f.hdr.phy.chains = 1; + baf->f.hdr.phy.mcs = AR9170_TXRX_PHY_RATE_OFDM_6M; + + /* format outgoing BA */ + ba->frame_control = cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_BACK); + ba->duration = cpu_to_le16(0); + + /* the BAR contains all necessary MACs. All we need is to swap them */ + memcpy(ba->ra, ctx->ta, 6); + memcpy(ba->ta, ctx->ra, 6); + + /* + * Unfortunately, we cannot look into the hardware's scoreboard. + * Therefore we have to proceed as described in 802.11n 9.10.7.5 + * and send a null BlockAck. + */ + memset(ba->bitmap, 0x0, sizeof(ba->bitmap)); + + /* + * Both, the original firmare and ath9k set the NO ACK flag in + * the BA Ack Policy subfield. + */ + ba->control = ctx->control | cpu_to_le16(1); + ba->start_seq_num = ctx->start_seq_num; + wlan_tx_fw(&baf->s, NULL); +} + +static struct carl9170_bar_ctx *wlan_get_bar_cache_buffer(void) +{ + struct carl9170_bar_ctx *tmp; + + tmp = &fw.wlan.ba_cache[fw.wlan.ba_tail_idx]; + fw.wlan.ba_tail_idx++; + fw.wlan.ba_tail_idx %= CONFIG_CARL9170FW_BACK_REQS_NUM; + if (fw.wlan.queued_ba < CONFIG_CARL9170FW_BACK_REQS_NUM) + fw.wlan.queued_ba++; + + return tmp; +} + +static void handle_bar(struct dma_desc *desc __unused, struct ieee80211_hdr *hdr, + unsigned int len, unsigned int mac_err) +{ + struct ieee80211_bar *bar; + struct carl9170_bar_ctx *ctx; + + if (unlikely(mac_err)) { + /* + * This check does a number of things: + * 1. checks if the frame is in good nick + * 2. checks if the RA (MAC) matches + */ + return ; + } + + if (unlikely(len < (sizeof(struct ieee80211_bar) + FCS_LEN))) { + /* + * Sneaky, corrupted BARs... but not with us! + */ + + return ; + } + + bar = (void *) hdr; + + if ((bar->control & cpu_to_le16(IEEE80211_BAR_CTRL_MULTI_TID)) || + !(bar->control & cpu_to_le16(IEEE80211_BAR_CTRL_CBMTID_COMPRESSED_BA))) { + /* not implemented yet */ + + return ; + } + + ctx = wlan_get_bar_cache_buffer(); + + memcpy(ctx->ra, bar->ra, 6); + memcpy(ctx->ta, bar->ta, 6); + ctx->control = bar->control; + ctx->start_seq_num = bar->start_seq_num; +} + +static void wlan_check_rx_overrun(void) +{ + uint32_t overruns, total; + + fw.tally.rx_total += total = get(AR9170_MAC_REG_RX_TOTAL); + fw.tally.rx_overrun += overruns = get(AR9170_MAC_REG_RX_OVERRUN); + if (unlikely(overruns)) { + if (overruns == total) { + DBG("RX Overrun"); + fw.wlan.mac_reset++; + } + + wlan_trigger(AR9170_DMA_TRIGGER_RXQ); + } +} + +static unsigned int wlan_rx_filter(struct dma_desc *desc) +{ + struct ieee80211_hdr *hdr; + unsigned int data_len; + unsigned int rx_filter; + unsigned int mac_err; + + data_len = ar9170_get_rx_mpdu_len(desc); + mac_err = ar9170_get_rx_macstatus_error(desc); + +#define AR9170_RX_ERROR_BAD (AR9170_RX_ERROR_FCS | AR9170_RX_ERROR_PLCP) + + if (unlikely(data_len < (4 + 6 + FCS_LEN) || + desc->totalLen > CONFIG_CARL9170FW_RX_FRAME_LEN) || + mac_err & AR9170_RX_ERROR_BAD) { + /* + * This frame is too damaged to do anything + * useful with it. + */ + + return CARL9170_RX_FILTER_BAD; + } + + rx_filter = 0; + if (mac_err & AR9170_RX_ERROR_WRONG_RA) + rx_filter |= CARL9170_RX_FILTER_OTHER_RA; + + if (mac_err & AR9170_RX_ERROR_DECRYPT) + rx_filter |= CARL9170_RX_FILTER_DECRY_FAIL; + + hdr = ar9170_get_rx_i3e(desc); + if (likely(ieee80211_is_data(hdr->frame_control))) { + rx_filter |= CARL9170_RX_FILTER_DATA; + } else if (ieee80211_is_ctl(hdr->frame_control)) { + switch (le16_to_cpu(hdr->frame_control) & IEEE80211_FCTL_STYPE) { + case IEEE80211_STYPE_BACK_REQ: + handle_bar(desc, hdr, data_len, mac_err); + rx_filter |= CARL9170_RX_FILTER_CTL_BACKR; + break; + case IEEE80211_STYPE_PSPOLL: + rx_filter |= CARL9170_RX_FILTER_CTL_PSPOLL; + break; + case IEEE80211_STYPE_BACK: + if (fw.wlan.queued_bar) { + /* + * Don't filter block acks when the application + * has queued BARs. This is because the firmware + * can't do the accouting and the application + * has to sort out if the BA belongs to any BARs. + */ + break; + } + /* otherwise fall through */ + default: + rx_filter |= CARL9170_RX_FILTER_CTL_OTHER; + break; + } + } else { + /* ieee80211_is_mgmt */ + rx_filter |= CARL9170_RX_FILTER_MGMT; + } + + if (unlikely(fw.suspend_mode == CARL9170_HOST_SUSPENDED)) { + wol_rx(rx_filter, hdr, min(data_len, + (unsigned int)AR9170_BLOCK_SIZE)); + } + +#undef AR9170_RX_ERROR_BAD + + return rx_filter; +} + +static void handle_rx(void) +{ + struct dma_desc *desc; + + for_each_desc_not_bits(desc, &fw.wlan.rx_queue, AR9170_OWN_BITS_HW) { + if (!(wlan_rx_filter(desc) & fw.wlan.rx_filter)) { + dma_put(&fw.pta.up_queue, desc); + up_trigger(); + } else { + dma_reclaim(&fw.wlan.rx_queue, desc); + wlan_trigger(AR9170_DMA_TRIGGER_RXQ); + } + } +} + +#ifdef CONFIG_CARL9170FW_CAB_QUEUE +void wlan_cab_flush_queue(const unsigned int vif) +{ + struct dma_queue *cab_queue = &fw.wlan.cab_queue[vif]; + struct dma_desc *desc; + + /* move queued frames into the main tx queues */ + for_each_desc(desc, cab_queue) { + struct carl9170_tx_superframe *super = get_super(desc); + if (!queue_empty(cab_queue)) { + /* + * Set MOREDATA flag for all, + * but the last queued frame. + * see: 802.11-2007 11.2.1.5 f) + * + * This is actually the reason to why + * we need to prevent the reentry. + */ + + super->f.data.i3e.frame_control |= + cpu_to_le16(IEEE80211_FCTL_MOREDATA); + } else { + super->f.data.i3e.frame_control &= + cpu_to_le16(~IEEE80211_FCTL_MOREDATA); + } + + /* ready to roll! */ + _wlan_tx(desc); + __wlan_tx(desc); + wlan_trigger(BIT(super->s.queue)); + } +} + +static uint8_t *beacon_find_ie(uint8_t ie, void *addr, + const unsigned int len) +{ + struct ieee80211_mgmt *mgmt = addr; + uint8_t *pos, *end; + + pos = mgmt->u.beacon.variable; + end = (uint8_t *) ((unsigned long)mgmt + (len - FCS_LEN)); + while (pos < end) { + if (pos + 2 + pos[1] > end) + return NULL; + + if (pos[0] == ie) + return pos; + + pos += pos[1] + 2; + } + + return NULL; +} + +void wlan_modify_beacon(const unsigned int vif, + const unsigned int addr, const unsigned int len) +{ + uint8_t *_ie; + struct ieee80211_tim_ie *ie; + + _ie = beacon_find_ie(WLAN_EID_TIM, (void *)addr, len); + if (likely(_ie)) { + ie = (struct ieee80211_tim_ie *) &_ie[2]; + + if (!queue_empty(&fw.wlan.cab_queue[vif]) && (ie->dtim_count == 0)) { + /* schedule DTIM transfer */ + fw.wlan.cab_flush_trigger[vif] = CARL9170_CAB_TRIGGER_ARMED; + } else if ((fw.wlan.cab_queue_len[vif] == 0) && (fw.wlan.cab_flush_trigger[vif])) { + /* undo all chances to the beacon structure */ + ie->bitmap_ctrl &= ~0x1; + fw.wlan.cab_flush_trigger[vif] = CARL9170_CAB_TRIGGER_EMPTY; + } + + /* Triggered by CARL9170_CAB_TRIGGER_ARMED || CARL9170_CAB_TRIGGER_DEFER */ + if (fw.wlan.cab_flush_trigger[vif]) { + /* Set the almighty Multicast Traffic Indication Bit. */ + ie->bitmap_ctrl |= 0x1; + } + } + + /* + * Ideally, the sequence number should be assigned by the TX arbiter + * hardware. But AFAIK that's not possible, so we have to go for the + * next best thing and write it into the beacon fifo during the open + * beacon update window. + */ + + wlan_assign_seq((struct ieee80211_hdr *)addr, vif); +} + +static void wlan_send_buffered_cab(void) +{ + unsigned int i; + + for (i = 0; i < CARL9170_INTF_NUM; i++) { + if (unlikely(fw.wlan.cab_flush_trigger[i] == CARL9170_CAB_TRIGGER_ARMED)) { + /* + * This is hardcoded into carl9170usb driver. + * + * The driver must set the PRETBTT event to beacon_interval - + * CARL9170_PRETBTT_KUS (usually 6) Kus. + * + * But still, we can only do so much about 802.11-2007 9.3.2.1 & + * 11.2.1.6. Let's hope the current solution is adequate enough. + */ + + if (is_after_msecs(fw.wlan.cab_flush_time, (CARL9170_TBTT_DELTA))) { + wlan_cab_flush_queue(i); + + /* + * This prevents the code from sending new BC/MC frames + * which were queued after the previous buffered traffic + * has been sent out... They will have to wait until the + * next DTIM beacon comes along. + */ + fw.wlan.cab_flush_trigger[i] = CARL9170_CAB_TRIGGER_DEFER; + } + } + + } +} +#endif /* CONFIG_CARL9170FW_CAB_QUEUE */ + +static void handle_beacon_config(void) +{ + uint32_t bcn_count; + + bcn_count = get(AR9170_MAC_REG_BCN_COUNT); + send_cmd_to_host(4, CARL9170_RSP_BEACON_CONFIG, 0x00, + (uint8_t *) &bcn_count); +} + +static void handle_pretbtt(void) +{ +#ifdef CONFIG_CARL9170FW_CAB_QUEUE + fw.wlan.cab_flush_time = get_clock_counter(); +#endif /* CONFIG_CARL9170FW_CAB_QUEUE */ + +#ifdef CONFIG_CARL9170FW_RADIO_FUNCTIONS + rf_psm(); + + send_cmd_to_host(4, CARL9170_RSP_PRETBTT, 0x00, + (uint8_t *) &fw.phy.psm.state); +#endif /* CONFIG_CARL9170FW_RADIO_FUNCTIONS */ +} + +static void handle_atim(void) +{ + send_cmd_to_host(0, CARL9170_RSP_ATIM, 0x00, NULL); +} + +#ifdef CONFIG_CARL9170FW_DEBUG +static void handle_qos(void) +{ + /* + * What is the QoS Bit used for? + * Is it only an indicator for TXOP & Burst, or + * should we do something here? + */ +} + +static void handle_radar(void) +{ + send_cmd_to_host(0, CARL9170_RSP_RADAR, 0x00, NULL); +} +#endif /* CONFIG_CARL9170FW_DEBUG */ + +static void wlan_janitor(void) +{ +#ifdef CONFIG_CARL9170FW_CAB_QUEUE + wlan_send_buffered_cab(); +#endif /* CONFIG_CARL9170FW_CAB_QUEUE */ + + wlan_send_buffered_tx_status(); + + wlan_send_buffered_ba(); + + wol_janitor(); +} + +void handle_wlan(void) +{ + uint32_t intr; + + intr = get(AR9170_MAC_REG_INT_CTRL); + /* ACK Interrupt */ + set(AR9170_MAC_REG_INT_CTRL, intr); + +#define HANDLER(intr, flag, func) \ + do { \ + if ((intr & flag) != 0) { \ + func(); \ + } \ + } while (0) + + intr |= fw.wlan.soft_int; + fw.wlan.soft_int = 0; + + HANDLER(intr, AR9170_MAC_INT_PRETBTT, handle_pretbtt); + + HANDLER(intr, AR9170_MAC_INT_ATIM, handle_atim); + + HANDLER(intr, AR9170_MAC_INT_RXC, handle_rx); + + HANDLER(intr, (AR9170_MAC_INT_TXC | AR9170_MAC_INT_RETRY_FAIL), + handle_tx_completion); + +#ifdef CONFIG_CARL9170FW_DEBUG + HANDLER(intr, AR9170_MAC_INT_QOS, handle_qos); + + HANDLER(intr, AR9170_MAC_INT_RADAR, handle_radar); +#endif /* CONFIG_CARL9170FW_DEBUG */ + + HANDLER(intr, AR9170_MAC_INT_CFG_BCN, handle_beacon_config); + + if (unlikely(intr)) + DBG("Unhandled Interrupt %x\n", (unsigned int) intr); + + wlan_janitor(); + +#undef HANDLER +} + +enum { + CARL9170FW_TX_MAC_BUMP = 4, + CARL9170FW_TX_MAC_DEBUG = 6, + CARL9170FW_TX_MAC_RESET = 7, +}; + +static void wlan_check_hang(void) +{ + struct dma_desc *desc; + int i; + + for (i = AR9170_TXQ_SPECIAL; i >= AR9170_TXQ0; i--) { + if (queue_empty(&fw.wlan.tx_queue[i])) { + /* Nothing to do here... move along */ + continue; + } + + /* fetch the current DMA queue position */ + desc = (struct dma_desc *)get_wlan_txq_addr(i); + + /* Stuck frame detection */ + if (unlikely(DESC_PAYLOAD(desc) == fw.wlan.last_super[i])) { + fw.wlan.last_super_num[i]++; + + if (unlikely(fw.wlan.last_super_num[i] >= CARL9170FW_TX_MAC_RESET)) { + /* + * schedule MAC reset (aka OFF/ON => dead) + * + * This will almost certainly kill + * the device for good, but it's the + * recommended thing to do... + */ + + fw.wlan.mac_reset++; + } + +#ifdef CONFIG_CARL9170FW_DEBUG + if (unlikely(fw.wlan.last_super_num[i] >= CARL9170FW_TX_MAC_DEBUG)) { + /* + * Sigh, the queue is almost certainly + * dead. Dump the queue content to the + * user, maybe we find out why it got + * so stuck. + */ + + wlan_dump_queue(i); + } +#endif /* CONFIG_CARL9170FW_DEBUG */ + +#ifdef CONFIG_CARL9170FW_DMA_QUEUE_BUMP + if (unlikely(fw.wlan.last_super_num[i] >= CARL9170FW_TX_MAC_BUMP)) { + /* + * Hrrm, bump the queue a bit. + * maybe this will get it going again. + */ + + wlan_dma_bump(i); + wlan_trigger(BIT(i)); + } +#endif /* CONFIG_CARL9170FW_DMA_QUEUE_BUMP */ + } else { + /* Nothing stuck */ + fw.wlan.last_super[i] = DESC_PAYLOAD(desc); + fw.wlan.last_super_num[i] = 0; + } + } +} + +#ifdef CONFIG_CARL9170FW_FW_MAC_RESET +/* + * NB: Resetting the MAC is a two-edged sword. + * On most occasions, it does what it is supposed to do. + * But there is a chance that this will make it + * even worse and the radio dies silently. + */ +static void wlan_mac_reset(void) +{ + uint32_t val; + uint32_t agg_wait_counter; + uint32_t agg_density; + uint32_t bcn_start_addr; + uint32_t rctl, rcth; + uint32_t cam_mode; + uint32_t ack_power; + uint32_t rts_cts_tpc; + uint32_t rts_cts_rate; + int i; + +#ifdef CONFIG_CARL9170FW_RADIO_FUNCTIONS + uint32_t rx_BB; +#endif /* CONFIG_CARL9170FW_RADIO_FUNCTIONS */ + +#ifdef CONFIG_CARL9170FW_NOISY_MAC_RESET + INFO("MAC RESET"); +#endif /* CONFIG_CARL9170FW_NOISY_MAC_RESET */ + + /* Save aggregation parameters */ + agg_wait_counter = get(AR9170_MAC_REG_AMPDU_FACTOR); + agg_density = get(AR9170_MAC_REG_AMPDU_DENSITY); + + bcn_start_addr = get(AR9170_MAC_REG_BCN_ADDR); + + cam_mode = get(AR9170_MAC_REG_CAM_MODE); + rctl = get(AR9170_MAC_REG_CAM_ROLL_CALL_TBL_L); + rcth = get(AR9170_MAC_REG_CAM_ROLL_CALL_TBL_H); + + ack_power = get(AR9170_MAC_REG_ACK_TPC); + rts_cts_tpc = get(AR9170_MAC_REG_RTS_CTS_TPC); + rts_cts_rate = get(AR9170_MAC_REG_RTS_CTS_RATE); + +#ifdef CONFIG_CARL9170FW_RADIO_FUNCTIONS + /* 0x1c8960 write only */ + rx_BB = get(AR9170_PHY_REG_SWITCH_CHAIN_0); +#endif /* CONFIG_CARL9170FW_RADIO_FUNCTIONS */ + + /* TX/RX must be stopped by now */ + val = get(AR9170_MAC_REG_POWER_STATE_CTRL); + + val |= AR9170_MAC_POWER_STATE_CTRL_RESET; + + /* + * Manipulate CCA threshold to stop transmission + * + * set(AR9170_PHY_REG_CCA_THRESHOLD, 0x300); + */ + + /* + * check Rx state in 0(idle) 9(disable) + * + * chState = (get(AR9170_MAC_REG_MISC_684) >> 16) & 0xf; + * while( (chState != 0) && (chState != 9)) { + * chState = (get(AR9170_MAC_REG_MISC_684) >> 16) & 0xf; + * } + */ + + set(AR9170_MAC_REG_POWER_STATE_CTRL, val); + + delay(2); + + /* Restore aggregation parameters */ + set(AR9170_MAC_REG_AMPDU_FACTOR, agg_wait_counter); + set(AR9170_MAC_REG_AMPDU_DENSITY, agg_density); + + set(AR9170_MAC_REG_BCN_ADDR, bcn_start_addr); + set(AR9170_MAC_REG_CAM_MODE, cam_mode); + set(AR9170_MAC_REG_CAM_ROLL_CALL_TBL_L, rctl); + set(AR9170_MAC_REG_CAM_ROLL_CALL_TBL_H, rcth); + + set(AR9170_MAC_REG_RTS_CTS_TPC, rts_cts_tpc); + set(AR9170_MAC_REG_ACK_TPC, ack_power); + set(AR9170_MAC_REG_RTS_CTS_RATE, rts_cts_rate); + +#ifdef CONFIG_CARL9170FW_RADIO_FUNCTIONS + set(AR9170_PHY_REG_SWITCH_CHAIN_2, rx_BB); +#endif /* CONFIG_CARL9170FW_RADIO_FUNCTIONS */ + + /* + * Manipulate CCA threshold to resume transmission + * + * set(AR9170_PHY_REG_CCA_THRESHOLD, 0x0); + */ + + val = AR9170_DMA_TRIGGER_RXQ; + /* Reinitialize all WLAN TX DMA queues. */ + for (i = AR9170_TXQ_SPECIAL; i >= AR9170_TXQ0; i--) { + struct dma_desc *iter; + + __for_each_desc_bits(iter, &fw.wlan.tx_queue[i], AR9170_OWN_BITS_SW); + + /* kill the stuck frame */ + if (!is_terminator(&fw.wlan.tx_queue[i], iter) && + fw.wlan.last_super_num[i] >= CARL9170FW_TX_MAC_RESET && + fw.wlan.last_super[i] == DESC_PAYLOAD(iter)) { + struct carl9170_tx_superframe *super = get_super(iter); + + iter->status = AR9170_OWN_BITS_SW; + /* + * Mark the frame as failed. + * The BAFAIL flag allows the frame to sail through + * wlan_tx_status without much "unstuck" trouble. + */ + iter->ctrl &= ~(AR9170_CTRL_FAIL); + iter->ctrl |= AR9170_CTRL_BAFAIL; + + super->s.cnt = CARL9170_TX_MAX_RATE_TRIES; + super->s.rix = CARL9170_TX_MAX_RETRY_RATES; + + fw.wlan.last_super_num[i] = 0; + fw.wlan.last_super[i] = NULL; + iter = iter->lastAddr->nextAddr; + } + + set_wlan_txq_dma_addr(i, (uint32_t) iter); + if (!is_terminator(&fw.wlan.tx_queue[i], iter)) + val |= BIT(i); + + 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]), + fw.wlan.tx_queue[i].head, fw.wlan.tx_queue[i].terminator, + get_wlan_txq_addr(i), iter, iter->ctrl, iter->status); + } + + fw.wlan.soft_int |= AR9170_MAC_INT_RXC | AR9170_MAC_INT_TXC | + AR9170_MAC_INT_RETRY_FAIL; + + set(AR9170_MAC_REG_DMA_RXQ_ADDR, (uint32_t) fw.wlan.rx_queue.head); + wlan_trigger(val); +} +#else +static void wlan_mac_reset(void) +{ + /* The driver takes care of reinitializing the device */ + BUG("MAC RESET"); +} +#endif /* CONFIG_CARL9170FW_FW_MAC_RESET */ + +void __cold wlan_timer(void) +{ + unsigned int cached_mac_reset; + + cached_mac_reset = fw.wlan.mac_reset; + + /* TX Queue Hang check */ + wlan_check_hang(); + + /* RX Overrun check */ + wlan_check_rx_overrun(); + + if (unlikely(fw.wlan.mac_reset >= CARL9170_MAC_RESET_RESET)) { + wlan_mac_reset(); + fw.wlan.mac_reset = CARL9170_MAC_RESET_OFF; + } else { + if (fw.wlan.mac_reset && cached_mac_reset == fw.wlan.mac_reset) + fw.wlan.mac_reset--; + } +} |