1 files changed, 549 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 00000000000..73407b3f53e
--- /dev/null
+++ b/drivers/net/wireless/ath/ath5k/qcu.c
@@ -0,0 +1,549 @@
+/*
+ * 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)
+{
+	ATH5K_TRACE(ah->ah_sc);
+	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 *queue_info)
+{
+	ATH5K_TRACE(ah->ah_sc);
+	AR5K_ASSERT_ENTRY(queue, ah->ah_capabilities.cap_queues.q_tx_num);
+
+	if (ah->ah_txq[queue].tqi_type == AR5K_TX_QUEUE_INACTIVE)
+		return -EIO;
+
+	memcpy(&ah->ah_txq[queue], queue_info, sizeof(struct ath5k_txq_info));
+
+	/*XXX: Is this supported on 5210 ?*/
+	if ((queue_info->tqi_type == AR5K_TX_QUEUE_DATA &&
+			((queue_info->tqi_subtype == AR5K_WME_AC_VI) ||
+			(queue_info->tqi_subtype == AR5K_WME_AC_VO))) ||
+			queue_info->tqi_type == AR5K_TX_QUEUE_UAPSD)
+		ah->ah_txq[queue].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;
+
+	ATH5K_TRACE(ah->ah_sc);
+
+	/*
+	 * 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;
+	ATH5K_TRACE(ah->ah_sc);
+	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)
+{
+	ATH5K_TRACE(ah->ah_sc);
+	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 cw_min, cw_max, retry_lg, retry_sh;
+	struct ath5k_txq_info *tq = &ah->ah_txq[queue];
+
+	ATH5K_TRACE(ah->ah_sc);
+	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 +
+				(ah->ah_aifs + 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 +
+				(ah->ah_aifs + 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 cwmin/max by channel mode
+	 */
+	cw_min = ah->ah_cw_min = AR5K_TUNE_CWMIN;
+	cw_max = ah->ah_cw_max = AR5K_TUNE_CWMAX;
+	ah->ah_aifs = AR5K_TUNE_AIFS;
+	/*XR is only supported on 5212*/
+	if (IS_CHAN_XR(ah->ah_current_channel) &&
+			ah->ah_version == AR5K_AR5212) {
+		cw_min = ah->ah_cw_min = AR5K_TUNE_CWMIN_XR;
+		cw_max = ah->ah_cw_max = AR5K_TUNE_CWMAX_XR;
+		ah->ah_aifs = AR5K_TUNE_AIFS_XR;
+	/*B mode is not supported on 5210*/
+	} else if (IS_CHAN_B(ah->ah_current_channel) &&
+			ah->ah_version != AR5K_AR5210) {
+		cw_min = ah->ah_cw_min = AR5K_TUNE_CWMIN_11B;
+		cw_max = ah->ah_cw_max = AR5K_TUNE_CWMAX_11B;
+		ah->ah_aifs = AR5K_TUNE_AIFS_11B;
+	}
+
+	cw_min = 1;
+	while (cw_min < ah->ah_cw_min)
+		cw_min = (cw_min << 1) | 1;
+
+	cw_min = tq->tqi_cw_min < 0 ? (cw_min >> (-tq->tqi_cw_min)) :
+		((cw_min << tq->tqi_cw_min) + (1 << tq->tqi_cw_min) - 1);
+	cw_max = tq->tqi_cw_max < 0 ? (cw_max >> (-tq->tqi_cw_max)) :
+		((cw_max << tq->tqi_cw_max) + (1 << tq->tqi_cw_max) - 1);
+
+	/*
+	 * 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,
+			(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 initial content window (cw_min/cw_max)
+		 * and arbitrated interframe space (aifs)...
+		 */
+		ath5k_hw_reg_write(ah,
+			AR5K_REG_SM(cw_min, AR5K_DCU_LCL_IFS_CW_MIN) |
+			AR5K_REG_SM(cw_max, AR5K_DCU_LCL_IFS_CW_MAX) |
+			AR5K_REG_SM(ah->ah_aifs + 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_ID_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:
+			AR5K_REG_ENABLE_BITS(ah, AR5K_QUEUE_MISC(queue),
+				AR5K_QCU_MISC_FRSHED_BCN_SENT_GT |
+				AR5K_QCU_MISC_CBREXP_DIS |
+				AR5K_QCU_MISC_RDY_VEOL_POLICY |
+				AR5K_QCU_MISC_CBREXP_BCN_DIS);
+
+			ath5k_hw_reg_write(ah, ((AR5K_TUNE_BEACON_INTERVAL -
+				(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;
+}
+
+/*
+ * Get slot time from DCU
+ */
+unsigned int ath5k_hw_get_slot_time(struct ath5k_hw *ah)
+{
+	ATH5K_TRACE(ah->ah_sc);
+	if (ah->ah_version == AR5K_AR5210)
+		return ath5k_hw_clocktoh(ath5k_hw_reg_read(ah,
+				AR5K_SLOT_TIME) & 0xffff, ah->ah_turbo);
+	else
+		return ath5k_hw_reg_read(ah, AR5K_DCU_GBL_IFS_SLOT) & 0xffff;
+}
+
+/*
+ * Set slot time on DCU
+ */
+int ath5k_hw_set_slot_time(struct ath5k_hw *ah, unsigned int slot_time)
+{
+	ATH5K_TRACE(ah->ah_sc);
+	if (slot_time < AR5K_SLOT_TIME_9 || slot_time > AR5K_SLOT_TIME_MAX)
+		return -EINVAL;
+
+	if (ah->ah_version == AR5K_AR5210)
+		ath5k_hw_reg_write(ah, ath5k_hw_htoclock(slot_time,
+				ah->ah_turbo), AR5K_SLOT_TIME);
+	else
+		ath5k_hw_reg_write(ah, slot_time, AR5K_DCU_GBL_IFS_SLOT);
+
+	return 0;
+}
+