include_directories (../include/linux ../include/shared ../include include)
-set(carl9170_main_src src/main.c src/wlan.c src/fw.c src/gpio.c src/timer.c
+set(carl9170_main_src src/main.c src/wlan.c src/wlanrx.c src/wlantx.c
+ src/fw.c src/gpio.c src/timer.c
src/uart.c src/dma.c src/hostif.c src/reboot.S
src/printf.c src/rf.c src/cam.c src/wol.c)
/*
* carl9170 firmware - used by the ar9170 wireless device
*
- * WLAN
+ * shared WLAN functions, interfaces and definitions
*
* Copyright (c) 2000-2005 ZyDAS Technology Corporation
* Copyright (c) 2007-2009 Atheros Communications, Inc.
void wlan_timer(void);
void handle_wlan(void);
+void handle_wlan_rx(void);
+
+void wlan_send_buffered_tx_status(void);
+void wlan_send_buffered_cab(void);
+void wlan_send_buffered_ba(void);
+void handle_wlan_tx_completion(void);
+void wlan_dma_bump(unsigned int qidx);
+
void wlan_cab_flush_queue(const unsigned int vif);
void wlan_modify_beacon(const unsigned int vif,
const unsigned int bcn_addr,
* 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>
+ * Copyright 2009-2012 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
#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)
{
}
#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;
- }
-
- if (unlikely(super->s.cab))
- fw.wlan.cab_queue_len[super->s.vif_id]--;
-
- 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);
-
- 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;
- }
-
- _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;
}
}
-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);
- }
- }
-}
-
-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;
- }
- }
-
- }
-}
-
static void handle_beacon_config(void)
{
uint32_t bcn_count;
HANDLER(intr, AR9170_MAC_INT_ATIM, handle_atim);
- HANDLER(intr, AR9170_MAC_INT_RXC, handle_rx);
+ HANDLER(intr, AR9170_MAC_INT_RXC, handle_wlan_rx);
HANDLER(intr, (AR9170_MAC_INT_TXC | AR9170_MAC_INT_RETRY_FAIL),
- handle_tx_completion);
+ handle_wlan_tx_completion);
#ifdef CONFIG_CARL9170FW_DEBUG
HANDLER(intr, AR9170_MAC_INT_QOS, handle_qos);
--- /dev/null
+/*
+ * carl9170 firmware - used by the ar9170 wireless device
+ *
+ * WLAN receive routines
+ *
+ * Copyright (c) 2000-2005 ZyDAS Technology Corporation
+ * Copyright (c) 2007-2009 Atheros Communications, Inc.
+ * Copyright 2009 Johannes Berg <johannes@sipsolutions.net>
+ * Copyright 2009-2012 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 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 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;
+}
+
+void handle_wlan_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);
+ }
+ }
+}
--- /dev/null
+/*
+ * carl9170 firmware - used by the ar9170 wireless device
+ *
+ * WLAN transmit and tx status
+ *
+ * Copyright (c) 2000-2005 ZyDAS Technology Corporation
+ * Copyright (c) 2007-2009 Atheros Communications, Inc.
+ * Copyright 2009 Johannes Berg <johannes@sipsolutions.net>
+ * Copyright 2009-2012 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));
+}
+
+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);
+ }
+}
+#else
+void wlan_dma_bump(unsigned int __unused qidx)
+{
+}
+#endif /* CONFIG_CARL9170FW_DMA_QUEUE_BUMP */
+
+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;
+ }
+
+ if (unlikely(super->s.cab))
+ fw.wlan.cab_queue_len[super->s.vif_id]--;
+
+ 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;
+}
+
+void handle_wlan_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);
+
+ 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;
+ }
+
+ _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);
+}
+
+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);
+}
+
+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);
+}
+
+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;
+ }
+ }
+
+ }
+}
projects / carl9170fw.git / commitdiff