| /* |
| * 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, DCF Control Unit Functions |
| \********************************************/ |
| |
| #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
| |
| #include "ath5k.h" |
| #include "reg.h" |
| #include "debug.h" |
| #include <linux/log2.h> |
| |
| /** |
| * DOC: Queue Control Unit (QCU)/DCF Control Unit (DCU) functions |
| * |
| * Here we setup parameters for the 12 available TX queues. Note that |
| * on the various registers we can usually only map the first 10 of them so |
| * basically we have 10 queues to play with. Each queue has a matching |
| * QCU that controls when the queue will get triggered and multiple QCUs |
| * can be mapped to a single DCU that controls the various DFS parameters |
| * for the various queues. In our setup we have a 1:1 mapping between QCUs |
| * and DCUs allowing us to have different DFS settings for each queue. |
| * |
| * When a frame goes into a TX queue, QCU decides when it'll trigger a |
| * transmission based on various criteria (such as how many data we have inside |
| * it's buffer or -if it's a beacon queue- if it's time to fire up the queue |
| * based on TSF etc), DCU adds backoff, IFSes etc and then a scheduler |
| * (arbitrator) decides the priority of each QCU based on it's configuration |
| * (e.g. beacons are always transmitted when they leave DCU bypassing all other |
| * frames from other queues waiting to be transmitted). After a frame leaves |
| * the DCU it goes to PCU for further processing and then to PHY for |
| * the actual transmission. |
| */ |
| |
| |
| /******************\ |
| * Helper functions * |
| \******************/ |
| |
| /** |
| * ath5k_hw_num_tx_pending() - Get number of pending frames for a given queue |
| * @ah: The &struct ath5k_hw |
| * @queue: One of enum ath5k_tx_queue_id |
| */ |
| 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; |
| } |
| |
| /** |
| * ath5k_hw_release_tx_queue() - Set a transmit queue inactive |
| * @ah: The &struct ath5k_hw |
| * @queue: One of enum ath5k_tx_queue_id |
| */ |
| 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); |
| } |
| |
| /** |
| * ath5k_cw_validate() - Make sure the given cw is valid |
| * @cw_req: The contention window value to check |
| * |
| * Make sure cw is a power of 2 minus 1 and smaller than 1024 |
| */ |
| static u16 |
| ath5k_cw_validate(u16 cw_req) |
| { |
| cw_req = min(cw_req, (u16)1023); |
| |
| /* Check if cw_req + 1 a power of 2 */ |
| if (is_power_of_2(cw_req + 1)) |
| return cw_req; |
| |
| /* Check if cw_req is a power of 2 */ |
| if (is_power_of_2(cw_req)) |
| return cw_req - 1; |
| |
| /* If none of the above is correct |
| * find the closest power of 2 */ |
| cw_req = (u16) roundup_pow_of_two(cw_req) - 1; |
| |
| return cw_req; |
| } |
| |
| /** |
| * ath5k_hw_get_tx_queueprops() - Get properties for a transmit queue |
| * @ah: The &struct ath5k_hw |
| * @queue: One of enum ath5k_tx_queue_id |
| * @queue_info: The &struct ath5k_txq_info to fill |
| */ |
| 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; |
| } |
| |
| /** |
| * ath5k_hw_set_tx_queueprops() - Set properties for a transmit queue |
| * @ah: The &struct ath5k_hw |
| * @queue: One of enum ath5k_tx_queue_id |
| * @qinfo: The &struct ath5k_txq_info to use |
| * |
| * Returns 0 on success or -EIO if queue is inactive |
| */ |
| 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; |
| } |
| |
| /** |
| * ath5k_hw_setup_tx_queue() - Initialize a transmit queue |
| * @ah: The &struct ath5k_hw |
| * @queue_type: One of enum ath5k_tx_queue |
| * @queue_info: The &struct ath5k_txq_info to use |
| * |
| * Returns 0 on success, -EINVAL on invalid arguments |
| */ |
| 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; |
| 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 * |
| \*******************************/ |
| |
| /** |
| * ath5k_hw_set_tx_retry_limits() - Set tx retry limits on DCU |
| * @ah: The &struct ath5k_hw |
| * @queue: One of enum ath5k_tx_queue_id |
| * |
| * This function is used when initializing a queue, to set |
| * retry limits based on ah->ah_retry_* and the chipset used. |
| */ |
| 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: One of enum ath5k_tx_queue_id |
| * |
| * Set DCF 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; |
| enum ieee80211_band band; |
| struct ieee80211_supported_band *sband; |
| struct ieee80211_rate *rate; |
| u32 ack_tx_time, eifs, eifs_clock, sifs, sifs_clock; |
| u32 slot_time_clock = ath5k_hw_htoclock(ah, slot_time); |
| u32 rate_flags, i; |
| |
| 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->band == IEEE80211_BAND_5GHZ) |
| band = IEEE80211_BAND_5GHZ; |
| else |
| band = IEEE80211_BAND_2GHZ; |
| |
| switch (ah->ah_bwmode) { |
| case AR5K_BWMODE_5MHZ: |
| rate_flags = IEEE80211_RATE_SUPPORTS_5MHZ; |
| break; |
| case AR5K_BWMODE_10MHZ: |
| rate_flags = IEEE80211_RATE_SUPPORTS_10MHZ; |
| break; |
| default: |
| rate_flags = 0; |
| break; |
| } |
| sband = &ah->sbands[band]; |
| rate = NULL; |
| for (i = 0; i < sband->n_bitrates; i++) { |
| if ((rate_flags & sband->bitrates[i].flags) != rate_flags) |
| continue; |
| rate = &sband->bitrates[i]; |
| break; |
| } |
| if (WARN_ON(!rate)) |
| return -EINVAL; |
| |
| ack_tx_time = ath5k_hw_get_frame_duration(ah, band, 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; |
| } |
| |
| |
| /** |
| * ath5k_hw_init_queues() - Initialize tx queues |
| * @ah: The &struct ath5k_hw |
| * |
| * Initializes all tx queues based on information on |
| * ah->ah_txq* set by the driver |
| */ |
| 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, |
| "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; |
| } |
