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linux/drivers/net/wireless/ath/ath5k/qcu.c
Bruno Randolf de8af45520 ath5k: Simplify cw_min/max and AIFS configuration 
Get rid of overly complicated cw_min/max and AIFS configuration:

* Validate values in ath5k_hw_set_tx_queueprops(), so we can use them directly
  without further checks or computation in ath5k_hw_reset_tx_queue().

* Simplifiy by using AR5K_TUNE_AIFS|CWMIN|CWMAX variables directly since we
  don't support XR or B channels. That way we can also remove
  AR5K_TXQ_USEDEFAULT and the confusing logic around it.

* Update data types: AIFS is u8, CW's are u16.

* Remove now unneeded variables in ath5k_hw.

Signed-off-by: Bruno Randolf <br1@einfach.org>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
2010-09-21 11:05:16 -04:00

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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"
/*
* 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;
}
/*
* 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;
}
/*
* 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_version == AR5K_AR5210) {
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;
}
/*
* 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);
}
/*
* Set DFS properties for a transmit queue on DCU
*/
int ath5k_hw_reset_tx_queue(struct ath5k_hw *ah, unsigned int queue)
{
u32 retry_lg, retry_sh;
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];
if (tq->tqi_type == AR5K_TX_QUEUE_INACTIVE)
return 0;
if (ah->ah_version == AR5K_AR5210) {
/* Only handle data queues, others will be ignored */
if (tq->tqi_type != AR5K_TX_QUEUE_DATA)
return 0;
/* Set Slot time */
ath5k_hw_reg_write(ah, ah->ah_turbo ?
AR5K_INIT_SLOT_TIME_TURBO : AR5K_INIT_SLOT_TIME,
AR5K_SLOT_TIME);
/* Set ACK_CTS timeout */
ath5k_hw_reg_write(ah, ah->ah_turbo ?
AR5K_INIT_ACK_CTS_TIMEOUT_TURBO :
AR5K_INIT_ACK_CTS_TIMEOUT, AR5K_SLOT_TIME);
/* Set Transmit Latency */
ath5k_hw_reg_write(ah, ah->ah_turbo ?
AR5K_INIT_TRANSMIT_LATENCY_TURBO :
AR5K_INIT_TRANSMIT_LATENCY, AR5K_USEC_5210);
/* Set IFS0 */
if (ah->ah_turbo) {
ath5k_hw_reg_write(ah, ((AR5K_INIT_SIFS_TURBO +
tq->tqi_aifs * AR5K_INIT_SLOT_TIME_TURBO) <<
AR5K_IFS0_DIFS_S) | AR5K_INIT_SIFS_TURBO,
AR5K_IFS0);
} else {
ath5k_hw_reg_write(ah, ((AR5K_INIT_SIFS +
tq->tqi_aifs * AR5K_INIT_SLOT_TIME) <<
AR5K_IFS0_DIFS_S) |
AR5K_INIT_SIFS, AR5K_IFS0);
}
/* Set IFS1 */
ath5k_hw_reg_write(ah, ah->ah_turbo ?
AR5K_INIT_PROTO_TIME_CNTRL_TURBO :
AR5K_INIT_PROTO_TIME_CNTRL, AR5K_IFS1);
/* Set AR5K_PHY_SETTLING */
ath5k_hw_reg_write(ah, ah->ah_turbo ?
(ath5k_hw_reg_read(ah, AR5K_PHY_SETTLING) & ~0x7F)
| 0x38 :
(ath5k_hw_reg_read(ah, AR5K_PHY_SETTLING) & ~0x7F)
| 0x1C,
AR5K_PHY_SETTLING);
/* Set Frame Control Register */
ath5k_hw_reg_write(ah, ah->ah_turbo ?
(AR5K_PHY_FRAME_CTL_INI | AR5K_PHY_TURBO_MODE |
AR5K_PHY_TURBO_SHORT | 0x2020) :
(AR5K_PHY_FRAME_CTL_INI | 0x1020),
AR5K_PHY_FRAME_CTL_5210);
}
/*
* Calculate and set retry limits
*/
if (ah->ah_software_retry) {
/* XXX Need to test this */
retry_lg = ah->ah_limit_tx_retries;
retry_sh = retry_lg = retry_lg > AR5K_DCU_RETRY_LMT_SH_RETRY ?
AR5K_DCU_RETRY_LMT_SH_RETRY : retry_lg;
} else {
retry_lg = AR5K_INIT_LG_RETRY;
retry_sh = AR5K_INIT_SH_RETRY;
}
/*No QCU/DCU [5210]*/
if (ah->ah_version == AR5K_AR5210) {
ath5k_hw_reg_write(ah,
(tq->tqi_cw_min << AR5K_NODCU_RETRY_LMT_CW_MIN_S)
| AR5K_REG_SM(AR5K_INIT_SLG_RETRY,
AR5K_NODCU_RETRY_LMT_SLG_RETRY)
| AR5K_REG_SM(AR5K_INIT_SSH_RETRY,
AR5K_NODCU_RETRY_LMT_SSH_RETRY)
| AR5K_REG_SM(retry_lg, AR5K_NODCU_RETRY_LMT_LG_RETRY)
| AR5K_REG_SM(retry_sh, AR5K_NODCU_RETRY_LMT_SH_RETRY),
AR5K_NODCU_RETRY_LMT);
} else {
/*QCU/DCU [5211+]*/
ath5k_hw_reg_write(ah,
AR5K_REG_SM(AR5K_INIT_SLG_RETRY,
AR5K_DCU_RETRY_LMT_SLG_RETRY) |
AR5K_REG_SM(AR5K_INIT_SSH_RETRY,
AR5K_DCU_RETRY_LMT_SSH_RETRY) |
AR5K_REG_SM(retry_lg, AR5K_DCU_RETRY_LMT_LG_RETRY) |
AR5K_REG_SM(retry_sh, AR5K_DCU_RETRY_LMT_SH_RETRY),
AR5K_QUEUE_DFS_RETRY_LIMIT(queue));
/*===Rest is also for QCU/DCU only [5211+]===*/
/*
* 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 misc registers
*/
/* Enable DCU early termination for this queue */
AR5K_REG_ENABLE_BITS(ah, AR5K_QUEUE_MISC(queue),
AR5K_QCU_MISC_DCU_EARLY);
/* 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);
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);
}
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);
}
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));
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;
}
/*
* Set slot time on DCU
*/
int ath5k_hw_set_slot_time(struct ath5k_hw *ah, unsigned int slot_time)
{
u32 slot_time_clock = ath5k_hw_htoclock(ah, slot_time);
if (slot_time < 6 || slot_time_clock > AR5K_SLOT_TIME_MAX)
return -EINVAL;
if (ah->ah_version == AR5K_AR5210)
ath5k_hw_reg_write(ah, slot_time_clock, AR5K_SLOT_TIME);
else
ath5k_hw_reg_write(ah, slot_time_clock, AR5K_DCU_GBL_IFS_SLOT);
return 0;
}
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