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linux/drivers/net/wireless/ath/ath5k/qcu.c
Felix Fietkau 488a50176c ath5k: fix SIFS time handling 
ath5k uses 8 usec as a sifs time, extracted from the initvals, whereas the
standard requires a sifs time of 10. The difference originates from the fact
that the SIFS register has an offset of 2 usec.
Fix the SIFS time definition to use the standard value of 10 usec and subtract
2 usecs when writing the SIFS register.

Signed-off-by: Felix Fietkau <nbd@openwrt.org>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
2011-04-12 16:59:06 -04:00

651 lines
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/*
* Copyright (c) 2004-2008 Reyk Floeter <reyk@openbsd.org>
* Copyright (c) 2006-2008 Nick Kossifidis <mickflemm@gmail.com>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*
*/
/********************************************\
Queue Control Unit, DFS Control Unit Functions
\********************************************/
#include "ath5k.h"
#include "reg.h"
#include "debug.h"
#include "base.h"
/******************\
* Helper functions *
\******************/
/*
* Get number of pending frames
* for a specific queue [5211+]
*/
u32 ath5k_hw_num_tx_pending(struct ath5k_hw *ah, unsigned int queue)
{
u32 pending;
AR5K_ASSERT_ENTRY(queue, ah->ah_capabilities.cap_queues.q_tx_num);
/* Return if queue is declared inactive */
if (ah->ah_txq[queue].tqi_type == AR5K_TX_QUEUE_INACTIVE)
return false;
/* XXX: How about AR5K_CFG_TXCNT ? */
if (ah->ah_version == AR5K_AR5210)
return false;
pending = ath5k_hw_reg_read(ah, AR5K_QUEUE_STATUS(queue));
pending &= AR5K_QCU_STS_FRMPENDCNT;
/* It's possible to have no frames pending even if TXE
* is set. To indicate that q has not stopped return
* true */
if (!pending && AR5K_REG_READ_Q(ah, AR5K_QCU_TXE, queue))
return true;
return pending;
}
/*
* Set a transmit queue inactive
*/
void ath5k_hw_release_tx_queue(struct ath5k_hw *ah, unsigned int queue)
{
if (WARN_ON(queue >= ah->ah_capabilities.cap_queues.q_tx_num))
return;
/* This queue will be skipped in further operations */
ah->ah_txq[queue].tqi_type = AR5K_TX_QUEUE_INACTIVE;
/*For SIMR setup*/
AR5K_Q_DISABLE_BITS(ah->ah_txq_status, queue);
}
/*
* Make sure cw is a power of 2 minus 1 and smaller than 1024
*/
static u16 ath5k_cw_validate(u16 cw_req)
{
u32 cw = 1;
cw_req = min(cw_req, (u16)1023);
while (cw < cw_req)
cw = (cw << 1) | 1;
return cw;
}
/*
* Get properties for a transmit queue
*/
int ath5k_hw_get_tx_queueprops(struct ath5k_hw *ah, int queue,
struct ath5k_txq_info *queue_info)
{
memcpy(queue_info, &ah->ah_txq[queue], sizeof(struct ath5k_txq_info));
return 0;
}
/*
* Set properties for a transmit queue
*/
int ath5k_hw_set_tx_queueprops(struct ath5k_hw *ah, int queue,
const struct ath5k_txq_info *qinfo)
{
struct ath5k_txq_info *qi;
AR5K_ASSERT_ENTRY(queue, ah->ah_capabilities.cap_queues.q_tx_num);
qi = &ah->ah_txq[queue];
if (qi->tqi_type == AR5K_TX_QUEUE_INACTIVE)
return -EIO;
/* copy and validate values */
qi->tqi_type = qinfo->tqi_type;
qi->tqi_subtype = qinfo->tqi_subtype;
qi->tqi_flags = qinfo->tqi_flags;
/*
* According to the docs: Although the AIFS field is 8 bit wide,
* the maximum supported value is 0xFC. Setting it higher than that
* will cause the DCU to hang.
*/
qi->tqi_aifs = min(qinfo->tqi_aifs, (u8)0xFC);
qi->tqi_cw_min = ath5k_cw_validate(qinfo->tqi_cw_min);
qi->tqi_cw_max = ath5k_cw_validate(qinfo->tqi_cw_max);
qi->tqi_cbr_period = qinfo->tqi_cbr_period;
qi->tqi_cbr_overflow_limit = qinfo->tqi_cbr_overflow_limit;
qi->tqi_burst_time = qinfo->tqi_burst_time;
qi->tqi_ready_time = qinfo->tqi_ready_time;
/*XXX: Is this supported on 5210 ?*/
/*XXX: Is this correct for AR5K_WME_AC_VI,VO ???*/
if ((qinfo->tqi_type == AR5K_TX_QUEUE_DATA &&
((qinfo->tqi_subtype == AR5K_WME_AC_VI) ||
(qinfo->tqi_subtype == AR5K_WME_AC_VO))) ||
qinfo->tqi_type == AR5K_TX_QUEUE_UAPSD)
qi->tqi_flags |= AR5K_TXQ_FLAG_POST_FR_BKOFF_DIS;
return 0;
}
/*
* Initialize a transmit queue
*/
int ath5k_hw_setup_tx_queue(struct ath5k_hw *ah, enum ath5k_tx_queue queue_type,
struct ath5k_txq_info *queue_info)
{
unsigned int queue;
int ret;
/*
* Get queue by type
*/
/* 5210 only has 2 queues */
if (ah->ah_capabilities.cap_queues.q_tx_num == 2) {
switch (queue_type) {
case AR5K_TX_QUEUE_DATA:
queue = AR5K_TX_QUEUE_ID_NOQCU_DATA;
break;
case AR5K_TX_QUEUE_BEACON:
case AR5K_TX_QUEUE_CAB:
queue = AR5K_TX_QUEUE_ID_NOQCU_BEACON;
break;
default:
return -EINVAL;
}
} else {
switch (queue_type) {
case AR5K_TX_QUEUE_DATA:
for (queue = AR5K_TX_QUEUE_ID_DATA_MIN;
ah->ah_txq[queue].tqi_type !=
AR5K_TX_QUEUE_INACTIVE; queue++) {
if (queue > AR5K_TX_QUEUE_ID_DATA_MAX)
return -EINVAL;
}
break;
case AR5K_TX_QUEUE_UAPSD:
queue = AR5K_TX_QUEUE_ID_UAPSD;
break;
case AR5K_TX_QUEUE_BEACON:
queue = AR5K_TX_QUEUE_ID_BEACON;
break;
case AR5K_TX_QUEUE_CAB:
queue = AR5K_TX_QUEUE_ID_CAB;
break;
case AR5K_TX_QUEUE_XR_DATA:
if (ah->ah_version != AR5K_AR5212)
ATH5K_ERR(ah->ah_sc,
"XR data queues only supported in"
" 5212!\n");
queue = AR5K_TX_QUEUE_ID_XR_DATA;
break;
default:
return -EINVAL;
}
}
/*
* Setup internal queue structure
*/
memset(&ah->ah_txq[queue], 0, sizeof(struct ath5k_txq_info));
ah->ah_txq[queue].tqi_type = queue_type;
if (queue_info != NULL) {
queue_info->tqi_type = queue_type;
ret = ath5k_hw_set_tx_queueprops(ah, queue, queue_info);
if (ret)
return ret;
}
/*
* We use ah_txq_status to hold a temp value for
* the Secondary interrupt mask registers on 5211+
* check out ath5k_hw_reset_tx_queue
*/
AR5K_Q_ENABLE_BITS(ah->ah_txq_status, queue);
return queue;
}
/*******************************\
* Single QCU/DCU initialization *
\*******************************/
/*
* Set tx retry limits on DCU
*/
void ath5k_hw_set_tx_retry_limits(struct ath5k_hw *ah,
unsigned int queue)
{
/* Single data queue on AR5210 */
if (ah->ah_version == AR5K_AR5210) {
struct ath5k_txq_info *tq = &ah->ah_txq[queue];
if (queue > 0)
return;
ath5k_hw_reg_write(ah,
(tq->tqi_cw_min << AR5K_NODCU_RETRY_LMT_CW_MIN_S)
| AR5K_REG_SM(ah->ah_retry_long,
AR5K_NODCU_RETRY_LMT_SLG_RETRY)
| AR5K_REG_SM(ah->ah_retry_short,
AR5K_NODCU_RETRY_LMT_SSH_RETRY)
| AR5K_REG_SM(ah->ah_retry_long,
AR5K_NODCU_RETRY_LMT_LG_RETRY)
| AR5K_REG_SM(ah->ah_retry_short,
AR5K_NODCU_RETRY_LMT_SH_RETRY),
AR5K_NODCU_RETRY_LMT);
/* DCU on AR5211+ */
} else {
ath5k_hw_reg_write(ah,
AR5K_REG_SM(ah->ah_retry_long,
AR5K_DCU_RETRY_LMT_RTS)
| AR5K_REG_SM(ah->ah_retry_long,
AR5K_DCU_RETRY_LMT_STA_RTS)
| AR5K_REG_SM(max(ah->ah_retry_long, ah->ah_retry_short),
AR5K_DCU_RETRY_LMT_STA_DATA),
AR5K_QUEUE_DFS_RETRY_LIMIT(queue));
}
}
/**
* ath5k_hw_reset_tx_queue - Initialize a single hw queue
*
* @ah The &struct ath5k_hw
* @queue The hw queue number
*
* Set DFS properties for the given transmit queue on DCU
* and configures all queue-specific parameters.
*/
int ath5k_hw_reset_tx_queue(struct ath5k_hw *ah, unsigned int queue)
{
struct ath5k_txq_info *tq = &ah->ah_txq[queue];
AR5K_ASSERT_ENTRY(queue, ah->ah_capabilities.cap_queues.q_tx_num);
tq = &ah->ah_txq[queue];
/* Skip if queue inactive or if we are on AR5210
* that doesn't have QCU/DCU */
if ((ah->ah_version == AR5K_AR5210) ||
(tq->tqi_type == AR5K_TX_QUEUE_INACTIVE))
return 0;
/*
* Set contention window (cw_min/cw_max)
* and arbitrated interframe space (aifs)...
*/
ath5k_hw_reg_write(ah,
AR5K_REG_SM(tq->tqi_cw_min, AR5K_DCU_LCL_IFS_CW_MIN) |
AR5K_REG_SM(tq->tqi_cw_max, AR5K_DCU_LCL_IFS_CW_MAX) |
AR5K_REG_SM(tq->tqi_aifs, AR5K_DCU_LCL_IFS_AIFS),
AR5K_QUEUE_DFS_LOCAL_IFS(queue));
/*
* Set tx retry limits for this queue
*/
ath5k_hw_set_tx_retry_limits(ah, queue);
/*
* Set misc registers
*/
/* Enable DCU to wait for next fragment from QCU */
AR5K_REG_ENABLE_BITS(ah, AR5K_QUEUE_DFS_MISC(queue),
AR5K_DCU_MISC_FRAG_WAIT);
/* On Maui and Spirit use the global seqnum on DCU */
if (ah->ah_mac_version < AR5K_SREV_AR5211)
AR5K_REG_ENABLE_BITS(ah, AR5K_QUEUE_DFS_MISC(queue),
AR5K_DCU_MISC_SEQNUM_CTL);
/* Constant bit rate period */
if (tq->tqi_cbr_period) {
ath5k_hw_reg_write(ah, AR5K_REG_SM(tq->tqi_cbr_period,
AR5K_QCU_CBRCFG_INTVAL) |
AR5K_REG_SM(tq->tqi_cbr_overflow_limit,
AR5K_QCU_CBRCFG_ORN_THRES),
AR5K_QUEUE_CBRCFG(queue));
AR5K_REG_ENABLE_BITS(ah, AR5K_QUEUE_MISC(queue),
AR5K_QCU_MISC_FRSHED_CBR);
if (tq->tqi_cbr_overflow_limit)
AR5K_REG_ENABLE_BITS(ah, AR5K_QUEUE_MISC(queue),
AR5K_QCU_MISC_CBR_THRES_ENABLE);
}
/* Ready time interval */
if (tq->tqi_ready_time && (tq->tqi_type != AR5K_TX_QUEUE_CAB))
ath5k_hw_reg_write(ah, AR5K_REG_SM(tq->tqi_ready_time,
AR5K_QCU_RDYTIMECFG_INTVAL) |
AR5K_QCU_RDYTIMECFG_ENABLE,
AR5K_QUEUE_RDYTIMECFG(queue));
if (tq->tqi_burst_time) {
ath5k_hw_reg_write(ah, AR5K_REG_SM(tq->tqi_burst_time,
AR5K_DCU_CHAN_TIME_DUR) |
AR5K_DCU_CHAN_TIME_ENABLE,
AR5K_QUEUE_DFS_CHANNEL_TIME(queue));
if (tq->tqi_flags & AR5K_TXQ_FLAG_RDYTIME_EXP_POLICY_ENABLE)
AR5K_REG_ENABLE_BITS(ah, AR5K_QUEUE_MISC(queue),
AR5K_QCU_MISC_RDY_VEOL_POLICY);
}
/* Enable/disable Post frame backoff */
if (tq->tqi_flags & AR5K_TXQ_FLAG_BACKOFF_DISABLE)
ath5k_hw_reg_write(ah, AR5K_DCU_MISC_POST_FR_BKOFF_DIS,
AR5K_QUEUE_DFS_MISC(queue));
/* Enable/disable fragmentation burst backoff */
if (tq->tqi_flags & AR5K_TXQ_FLAG_FRAG_BURST_BACKOFF_ENABLE)
ath5k_hw_reg_write(ah, AR5K_DCU_MISC_BACKOFF_FRAG,
AR5K_QUEUE_DFS_MISC(queue));
/*
* Set registers by queue type
*/
switch (tq->tqi_type) {
case AR5K_TX_QUEUE_BEACON:
AR5K_REG_ENABLE_BITS(ah, AR5K_QUEUE_MISC(queue),
AR5K_QCU_MISC_FRSHED_DBA_GT |
AR5K_QCU_MISC_CBREXP_BCN_DIS |
AR5K_QCU_MISC_BCN_ENABLE);
AR5K_REG_ENABLE_BITS(ah, AR5K_QUEUE_DFS_MISC(queue),
(AR5K_DCU_MISC_ARBLOCK_CTL_GLOBAL <<
AR5K_DCU_MISC_ARBLOCK_CTL_S) |
AR5K_DCU_MISC_ARBLOCK_IGNORE |
AR5K_DCU_MISC_POST_FR_BKOFF_DIS |
AR5K_DCU_MISC_BCN_ENABLE);
break;
case AR5K_TX_QUEUE_CAB:
/* XXX: use BCN_SENT_GT, if we can figure out how */
AR5K_REG_ENABLE_BITS(ah, AR5K_QUEUE_MISC(queue),
AR5K_QCU_MISC_FRSHED_DBA_GT |
AR5K_QCU_MISC_CBREXP_DIS |
AR5K_QCU_MISC_CBREXP_BCN_DIS);
ath5k_hw_reg_write(ah, ((tq->tqi_ready_time -
(AR5K_TUNE_SW_BEACON_RESP -
AR5K_TUNE_DMA_BEACON_RESP) -
AR5K_TUNE_ADDITIONAL_SWBA_BACKOFF) * 1024) |
AR5K_QCU_RDYTIMECFG_ENABLE,
AR5K_QUEUE_RDYTIMECFG(queue));
AR5K_REG_ENABLE_BITS(ah, AR5K_QUEUE_DFS_MISC(queue),
(AR5K_DCU_MISC_ARBLOCK_CTL_GLOBAL <<
AR5K_DCU_MISC_ARBLOCK_CTL_S));
break;
case AR5K_TX_QUEUE_UAPSD:
AR5K_REG_ENABLE_BITS(ah, AR5K_QUEUE_MISC(queue),
AR5K_QCU_MISC_CBREXP_DIS);
break;
case AR5K_TX_QUEUE_DATA:
default:
break;
}
/* TODO: Handle frame compression */
/*
* Enable interrupts for this tx queue
* in the secondary interrupt mask registers
*/
if (tq->tqi_flags & AR5K_TXQ_FLAG_TXOKINT_ENABLE)
AR5K_Q_ENABLE_BITS(ah->ah_txq_imr_txok, queue);
if (tq->tqi_flags & AR5K_TXQ_FLAG_TXERRINT_ENABLE)
AR5K_Q_ENABLE_BITS(ah->ah_txq_imr_txerr, queue);
if (tq->tqi_flags & AR5K_TXQ_FLAG_TXURNINT_ENABLE)
AR5K_Q_ENABLE_BITS(ah->ah_txq_imr_txurn, queue);
if (tq->tqi_flags & AR5K_TXQ_FLAG_TXDESCINT_ENABLE)
AR5K_Q_ENABLE_BITS(ah->ah_txq_imr_txdesc, queue);
if (tq->tqi_flags & AR5K_TXQ_FLAG_TXEOLINT_ENABLE)
AR5K_Q_ENABLE_BITS(ah->ah_txq_imr_txeol, queue);
if (tq->tqi_flags & AR5K_TXQ_FLAG_CBRORNINT_ENABLE)
AR5K_Q_ENABLE_BITS(ah->ah_txq_imr_cbrorn, queue);
if (tq->tqi_flags & AR5K_TXQ_FLAG_CBRURNINT_ENABLE)
AR5K_Q_ENABLE_BITS(ah->ah_txq_imr_cbrurn, queue);
if (tq->tqi_flags & AR5K_TXQ_FLAG_QTRIGINT_ENABLE)
AR5K_Q_ENABLE_BITS(ah->ah_txq_imr_qtrig, queue);
if (tq->tqi_flags & AR5K_TXQ_FLAG_TXNOFRMINT_ENABLE)
AR5K_Q_ENABLE_BITS(ah->ah_txq_imr_nofrm, queue);
/* Update secondary interrupt mask registers */
/* Filter out inactive queues */
ah->ah_txq_imr_txok &= ah->ah_txq_status;
ah->ah_txq_imr_txerr &= ah->ah_txq_status;
ah->ah_txq_imr_txurn &= ah->ah_txq_status;
ah->ah_txq_imr_txdesc &= ah->ah_txq_status;
ah->ah_txq_imr_txeol &= ah->ah_txq_status;
ah->ah_txq_imr_cbrorn &= ah->ah_txq_status;
ah->ah_txq_imr_cbrurn &= ah->ah_txq_status;
ah->ah_txq_imr_qtrig &= ah->ah_txq_status;
ah->ah_txq_imr_nofrm &= ah->ah_txq_status;
ath5k_hw_reg_write(ah, AR5K_REG_SM(ah->ah_txq_imr_txok,
AR5K_SIMR0_QCU_TXOK) |
AR5K_REG_SM(ah->ah_txq_imr_txdesc,
AR5K_SIMR0_QCU_TXDESC),
AR5K_SIMR0);
ath5k_hw_reg_write(ah, AR5K_REG_SM(ah->ah_txq_imr_txerr,
AR5K_SIMR1_QCU_TXERR) |
AR5K_REG_SM(ah->ah_txq_imr_txeol,
AR5K_SIMR1_QCU_TXEOL),
AR5K_SIMR1);
/* Update SIMR2 but don't overwrite rest simr2 settings */
AR5K_REG_DISABLE_BITS(ah, AR5K_SIMR2, AR5K_SIMR2_QCU_TXURN);
AR5K_REG_ENABLE_BITS(ah, AR5K_SIMR2,
AR5K_REG_SM(ah->ah_txq_imr_txurn,
AR5K_SIMR2_QCU_TXURN));
ath5k_hw_reg_write(ah, AR5K_REG_SM(ah->ah_txq_imr_cbrorn,
AR5K_SIMR3_QCBRORN) |
AR5K_REG_SM(ah->ah_txq_imr_cbrurn,
AR5K_SIMR3_QCBRURN),
AR5K_SIMR3);
ath5k_hw_reg_write(ah, AR5K_REG_SM(ah->ah_txq_imr_qtrig,
AR5K_SIMR4_QTRIG), AR5K_SIMR4);
/* Set TXNOFRM_QCU for the queues with TXNOFRM enabled */
ath5k_hw_reg_write(ah, AR5K_REG_SM(ah->ah_txq_imr_nofrm,
AR5K_TXNOFRM_QCU), AR5K_TXNOFRM);
/* No queue has TXNOFRM enabled, disable the interrupt
* by setting AR5K_TXNOFRM to zero */
if (ah->ah_txq_imr_nofrm == 0)
ath5k_hw_reg_write(ah, 0, AR5K_TXNOFRM);
/* Set QCU mask for this DCU to save power */
AR5K_REG_WRITE_Q(ah, AR5K_QUEUE_QCUMASK(queue), queue);
return 0;
}
/**************************\
* Global QCU/DCU functions *
\**************************/
/**
* ath5k_hw_set_ifs_intervals - Set global inter-frame spaces on DCU
*
* @ah The &struct ath5k_hw
* @slot_time Slot time in us
*
* Sets the global IFS intervals on DCU (also works on AR5210) for
* the given slot time and the current bwmode.
*/
int ath5k_hw_set_ifs_intervals(struct ath5k_hw *ah, unsigned int slot_time)
{
struct ieee80211_channel *channel = ah->ah_current_channel;
struct ath5k_softc *sc = ah->ah_sc;
struct ieee80211_rate *rate;
u32 ack_tx_time, eifs, eifs_clock, sifs, sifs_clock;
u32 slot_time_clock = ath5k_hw_htoclock(ah, slot_time);
if (slot_time < 6 || slot_time_clock > AR5K_SLOT_TIME_MAX)
return -EINVAL;
sifs = ath5k_hw_get_default_sifs(ah);
sifs_clock = ath5k_hw_htoclock(ah, sifs - 2);
/* EIFS
* Txtime of ack at lowest rate + SIFS + DIFS
* (DIFS = SIFS + 2 * Slot time)
*
* Note: HAL has some predefined values for EIFS
* Turbo: (37 + 2 * 6)
* Default: (74 + 2 * 9)
* Half: (149 + 2 * 13)
* Quarter: (298 + 2 * 21)
*
* (74 + 2 * 6) for AR5210 default and turbo !
*
* According to the formula we have
* ack_tx_time = 25 for turbo and
* ack_tx_time = 42.5 * clock multiplier
* for default/half/quarter.
*
* This can't be right, 42 is what we would get
* from ath5k_hw_get_frame_dur_for_bwmode or
* ieee80211_generic_frame_duration for zero frame
* length and without SIFS !
*
* Also we have different lowest rate for 802.11a
*/
if (channel->hw_value & CHANNEL_5GHZ)
rate = &sc->sbands[IEEE80211_BAND_5GHZ].bitrates[0];
else
rate = &sc->sbands[IEEE80211_BAND_2GHZ].bitrates[0];
ack_tx_time = ath5k_hw_get_frame_duration(ah, 10, rate, false);
/* ack_tx_time includes an SIFS already */
eifs = ack_tx_time + sifs + 2 * slot_time;
eifs_clock = ath5k_hw_htoclock(ah, eifs);
/* Set IFS settings on AR5210 */
if (ah->ah_version == AR5K_AR5210) {
u32 pifs, pifs_clock, difs, difs_clock;
/* Set slot time */
ath5k_hw_reg_write(ah, slot_time_clock, AR5K_SLOT_TIME);
/* Set EIFS */
eifs_clock = AR5K_REG_SM(eifs_clock, AR5K_IFS1_EIFS);
/* PIFS = Slot time + SIFS */
pifs = slot_time + sifs;
pifs_clock = ath5k_hw_htoclock(ah, pifs);
pifs_clock = AR5K_REG_SM(pifs_clock, AR5K_IFS1_PIFS);
/* DIFS = SIFS + 2 * Slot time */
difs = sifs + 2 * slot_time;
difs_clock = ath5k_hw_htoclock(ah, difs);
/* Set SIFS/DIFS */
ath5k_hw_reg_write(ah, (difs_clock <<
AR5K_IFS0_DIFS_S) | sifs_clock,
AR5K_IFS0);
/* Set PIFS/EIFS and preserve AR5K_INIT_CARR_SENSE_EN */
ath5k_hw_reg_write(ah, pifs_clock | eifs_clock |
(AR5K_INIT_CARR_SENSE_EN << AR5K_IFS1_CS_EN_S),
AR5K_IFS1);
return 0;
}
/* Set IFS slot time */
ath5k_hw_reg_write(ah, slot_time_clock, AR5K_DCU_GBL_IFS_SLOT);
/* Set EIFS interval */
ath5k_hw_reg_write(ah, eifs_clock, AR5K_DCU_GBL_IFS_EIFS);
/* Set SIFS interval in usecs */
AR5K_REG_WRITE_BITS(ah, AR5K_DCU_GBL_IFS_MISC,
AR5K_DCU_GBL_IFS_MISC_SIFS_DUR_USEC,
sifs);
/* Set SIFS interval in clock cycles */
ath5k_hw_reg_write(ah, sifs_clock, AR5K_DCU_GBL_IFS_SIFS);
return 0;
}
int ath5k_hw_init_queues(struct ath5k_hw *ah)
{
int i, ret;
/* TODO: HW Compression support for data queues */
/* TODO: Burst prefetch for data queues */
/*
* Reset queues and start beacon timers at the end of the reset routine
* This also sets QCU mask on each DCU for 1:1 qcu to dcu mapping
* Note: If we want we can assign multiple qcus on one dcu.
*/
if (ah->ah_version != AR5K_AR5210)
for (i = 0; i < ah->ah_capabilities.cap_queues.q_tx_num; i++) {
ret = ath5k_hw_reset_tx_queue(ah, i);
if (ret) {
ATH5K_ERR(ah->ah_sc,
"failed to reset TX queue #%d\n", i);
return ret;
}
}
else
/* No QCU/DCU on AR5210, just set tx
* retry limits. We set IFS parameters
* on ath5k_hw_set_ifs_intervals */
ath5k_hw_set_tx_retry_limits(ah, 0);
/* Set the turbo flag when operating on 40MHz */
if (ah->ah_bwmode == AR5K_BWMODE_40MHZ)
AR5K_REG_ENABLE_BITS(ah, AR5K_DCU_GBL_IFS_MISC,
AR5K_DCU_GBL_IFS_MISC_TURBO_MODE);
/* If we didn't set IFS timings through
* ath5k_hw_set_coverage_class make sure
* we set them here */
if (!ah->ah_coverage_class) {
unsigned int slot_time = ath5k_hw_get_default_slottime(ah);
ath5k_hw_set_ifs_intervals(ah, slot_time);
}
return 0;
}
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