Adding upstream version 4.19.249.upstream/4.19.249

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 729 insertions, 0 deletions

diff --git a/drivers/net/wireless/ath/ath5k/qcu.c b/drivers/net/wireless/ath/ath5k/qcu.c
new file mode 100644
index 000000000..147947f63
--- /dev/null
+++ b/drivers/net/wireless/ath/ath5k/qcu.c
@@ -0,0 +1,729 @@
+/*
+ * 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:
+			queue = queue_info->tqi_subtype;
+			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);
+
+	/* 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 nl80211_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 == NL80211_BAND_5GHZ)
+		band = NL80211_BAND_5GHZ;
+	else
+		band = NL80211_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;
+}