diff options
Diffstat (limited to '')
| -rw-r--r-- | carl9170fw/carlfw/src/wlan.c | 1211 |
1 files changed, 0 insertions, 1211 deletions
diff --git a/carl9170fw/carlfw/src/wlan.c b/carl9170fw/carlfw/src/wlan.c deleted file mode 100644 index d3328d6..0000000 --- a/carl9170fw/carlfw/src/wlan.c +++ /dev/null @@ -1,1211 +0,0 @@ -/* - * 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--; - } -} |