ar5416_misc.c

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/*-
 * SPDX-License-Identifier: ISC
 *
 * Copyright (c) 2002-2008 Sam Leffler, Errno Consulting
 * Copyright (c) 2002-2008 Atheros Communications, Inc.
 *
 * Permission to use, copy, modify, and/or 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.
 *
 * $FreeBSD$
 */
#include "opt_ah.h"
 
#include "ah.h"
#include "ah_internal.h"
#include "ah_devid.h"
#include "ah_desc.h"                    /* NB: for HAL_PHYERR* */
 
#include "ar5416/ar5416.h"
#include "ar5416/ar5416reg.h"
#include "ar5416/ar5416phy.h"
 
#include "ah_eeprom_v14.h"      /* for owl_get_ntxchains() */
 
/*
 * Return the wireless modes (a,b,g,n,t) supported by hardware.
 *
 * This value is what is actually supported by the hardware
 * and is unaffected by regulatory/country code settings.
 *
 */
u_int
ar5416GetWirelessModes(struct ath_hal *ah)
{
        u_int mode;
        struct ath_hal_private *ahpriv = AH_PRIVATE(ah);
        HAL_CAPABILITIES *pCap = &ahpriv->ah_caps;
 
        mode = ar5212GetWirelessModes(ah);
 
        /* Only enable HT modes if the NIC supports HT */
        if (pCap->halHTSupport == AH_TRUE && (mode & HAL_MODE_11A))
                mode |= HAL_MODE_11NA_HT20
                     |  HAL_MODE_11NA_HT40PLUS
                     |  HAL_MODE_11NA_HT40MINUS
                     ;
        if (pCap->halHTSupport == AH_TRUE && (mode & HAL_MODE_11G))
                mode |= HAL_MODE_11NG_HT20
                     |  HAL_MODE_11NG_HT40PLUS
                     |  HAL_MODE_11NG_HT40MINUS
                     ;
        return mode;
}
 
/*
 * Change the LED blinking pattern to correspond to the connectivity
 */
void
ar5416SetLedState(struct ath_hal *ah, HAL_LED_STATE state)
{
        static const uint32_t ledbits[8] = {
                AR_MAC_LED_ASSOC_NONE,          /* HAL_LED_INIT */
                AR_MAC_LED_ASSOC_PEND,          /* HAL_LED_SCAN */
                AR_MAC_LED_ASSOC_PEND,          /* HAL_LED_AUTH */
                AR_MAC_LED_ASSOC_ACTIVE,        /* HAL_LED_ASSOC*/
                AR_MAC_LED_ASSOC_ACTIVE,        /* HAL_LED_RUN */
                AR_MAC_LED_ASSOC_NONE,
                AR_MAC_LED_ASSOC_NONE,
                AR_MAC_LED_ASSOC_NONE,
        };
 
        if (AR_SREV_HOWL(ah))
                return;
 
        /*
         * Set the blink operating mode.
         */
        OS_REG_RMW_FIELD(ah, AR_MAC_LED,
            AR_MAC_LED_ASSOC, ledbits[state & 0x7]);
 
        /* XXX Blink slow mode? */
        /* XXX Blink threshold? */
        /* XXX Blink sleep hystersis? */
 
        /*
         * Set the LED blink configuration to be proportional
         * to the current TX and RX filter bytes.  (Ie, RX'ed
         * frames that don't match the filter are ignored.)
         * This means that higher TX/RX throughput will result
         * in the blink rate increasing.
         */
        OS_REG_RMW_FIELD(ah, AR_MAC_LED, AR_MAC_LED_MODE,
            AR_MAC_LED_MODE_PROP);
}
 
/*
 * Get the current hardware tsf for stamlme
 */
uint64_t
ar5416GetTsf64(struct ath_hal *ah)
{
        uint32_t low1, low2, u32;
 
        /* sync multi-word read */
        low1 = OS_REG_READ(ah, AR_TSF_L32);
        u32 = OS_REG_READ(ah, AR_TSF_U32);
        low2 = OS_REG_READ(ah, AR_TSF_L32);
        if (low2 < low1) {      /* roll over */
                /*
                 * If we are not preempted this will work.  If we are
                 * then we re-reading AR_TSF_U32 does no good as the
                 * low bits will be meaningless.  Likewise reading
                 * L32, U32, U32, then comparing the last two reads
                 * to check for rollover doesn't help if preempted--so
                 * we take this approach as it costs one less PCI read
                 * which can be noticeable when doing things like
                 * timestamping packets in monitor mode.
                 */
                u32++;
        }
        return (((uint64_t) u32) << 32) | ((uint64_t) low2);
}
 
/*
 * Update the TSF.
 *
 * The full TSF is only updated once the upper 32 bits have
 * been written.  Writing only the lower 32 bits of the TSF
 * will not actually correctly update the TSF.
 *
 * The #if 0'ed code is to check whether the previous TSF
 * reset or write has completed before writing to the
 * TSF.  Strictly speaking, it should be also checked before
 * reading the TSF as the write/reset may not have completed.
 */
void
ar5416SetTsf64(struct ath_hal *ah, uint64_t tsf64)
{
        /* XXX check if this is correct! */
#if 0
        int i;
        uint32_t v;
 
        for (i = 0; i < 10; i++) {
                v = OS_REG_READ(ah, AR_SLP32_MODE);
                if ((v & AR_SLP32_TSF_WRITE_STATUS) == 0)
                        break;
                OS_DELAY(10);
        }
        if (i == 10)
                ath_hal_printf(ah, "%s: couldn't slew things right!\n", __func__);
#endif
 
        OS_REG_WRITE(ah, AR_TSF_L32, tsf64 & 0xffffffff);
        OS_REG_WRITE(ah, AR_TSF_U32, (tsf64 >> 32) & 0xffffffff);
}
 
/*
 * Reset the current hardware tsf for stamlme.
 */
void
ar5416ResetTsf(struct ath_hal *ah)
{
        uint32_t v;
        int i;
 
        for (i = 0; i < 10; i++) {
                v = OS_REG_READ(ah, AR_SLP32_MODE);
                if ((v & AR_SLP32_TSF_WRITE_STATUS) == 0)
                        break;
                OS_DELAY(10);
        }
        OS_REG_WRITE(ah, AR_RESET_TSF, AR_RESET_TSF_ONCE);      
}
 
uint32_t
ar5416GetCurRssi(struct ath_hal *ah)
{
        if (AR_SREV_OWL(ah))
                return (OS_REG_READ(ah, AR_PHY_CURRENT_RSSI) & 0xff);
        return (OS_REG_READ(ah, AR9130_PHY_CURRENT_RSSI) & 0xff);
}
 
HAL_BOOL
ar5416SetAntennaSwitch(struct ath_hal *ah, HAL_ANT_SETTING settings)
{
        return AH_TRUE;
}
 
/* Setup decompression for given key index */
HAL_BOOL
ar5416SetDecompMask(struct ath_hal *ah, uint16_t keyidx, int en)
{
        return AH_TRUE;
}
 
/* Setup coverage class */
void
ar5416SetCoverageClass(struct ath_hal *ah, uint8_t coverageclass, int now)
{
 
        ar5212SetCoverageClass(ah, coverageclass, now);
}
 
/*
 * Return the busy for rx_frame, rx_clear, and tx_frame
 */
HAL_BOOL
ar5416GetMibCycleCounts(struct ath_hal *ah, HAL_SURVEY_SAMPLE *hsample)
{
        struct ath_hal_5416 *ahp = AH5416(ah);
        u_int32_t good = AH_TRUE;
 
        /* XXX freeze/unfreeze mib counters */
        uint32_t rc = OS_REG_READ(ah, AR_RCCNT);
        uint32_t ec = OS_REG_READ(ah, AR_EXTRCCNT);
        uint32_t rf = OS_REG_READ(ah, AR_RFCNT);
        uint32_t tf = OS_REG_READ(ah, AR_TFCNT);
        uint32_t cc = OS_REG_READ(ah, AR_CCCNT); /* read cycles last */
 
        if (ahp->ah_cycleCount == 0 || ahp->ah_cycleCount > cc) {
                /*
                 * Cycle counter wrap (or initial call); it's not possible
                 * to accurately calculate a value because the registers
                 * right shift rather than wrap--so punt and return 0.
                 */
                HALDEBUG(ah, HAL_DEBUG_ANY,
                            "%s: cycle counter wrap. ExtBusy = 0\n", __func__);
                        good = AH_FALSE;
        } else {
                hsample->cycle_count = cc - ahp->ah_cycleCount;
                hsample->chan_busy = rc - ahp->ah_ctlBusy;
                hsample->ext_chan_busy = ec - ahp->ah_extBusy;
                hsample->rx_busy = rf - ahp->ah_rxBusy;
                hsample->tx_busy = tf - ahp->ah_txBusy;
        }
 
        /*
         * Keep a copy of the MIB results so the next sample has something
         * to work from.
         */
        ahp->ah_cycleCount = cc;
        ahp->ah_rxBusy = rf;
        ahp->ah_ctlBusy = rc;
        ahp->ah_txBusy = tf;
        ahp->ah_extBusy = ec;
 
        return (good);
}
 
/*
 * Setup the TX/RX chainmasks - this needs to be done before a call
 * to the reset method as it doesn't update the hardware.
 */
void
ar5416SetChainMasks(struct ath_hal *ah, uint32_t tx_chainmask,
    uint32_t rx_chainmask)
{
        HAL_CAPABILITIES *pCap = &AH_PRIVATE(ah)->ah_caps;
 
        AH5416(ah)->ah_tx_chainmask = tx_chainmask & pCap->halTxChainMask;
        AH5416(ah)->ah_rx_chainmask = rx_chainmask & pCap->halRxChainMask;
}
 
/*
 * Return approximation of extension channel busy over an time interval
 * 0% (clear) -> 100% (busy)
 *
 * XXX TODO: update this to correctly sample all the counters,
 *           rather than a subset of it.
 */
uint32_t
ar5416Get11nExtBusy(struct ath_hal *ah)
{
    struct ath_hal_5416 *ahp = AH5416(ah);
    uint32_t busy; /* percentage */
    uint32_t cycleCount, ctlBusy, extBusy;
 
    ctlBusy = OS_REG_READ(ah, AR_RCCNT);
    extBusy = OS_REG_READ(ah, AR_EXTRCCNT);
    cycleCount = OS_REG_READ(ah, AR_CCCNT);
 
    if (ahp->ah_cycleCount == 0 || ahp->ah_cycleCount > cycleCount) {
        /*
         * Cycle counter wrap (or initial call); it's not possible
         * to accurately calculate a value because the registers
         * right shift rather than wrap--so punt and return 0.
         */
        busy = 0;
        HALDEBUG(ah, HAL_DEBUG_ANY, "%s: cycle counter wrap. ExtBusy = 0\n",
            __func__);
 
    } else {
        uint32_t cycleDelta = cycleCount - ahp->ah_cycleCount;
        uint32_t ctlBusyDelta = ctlBusy - ahp->ah_ctlBusy;
        uint32_t extBusyDelta = extBusy - ahp->ah_extBusy;
        uint32_t ctlClearDelta = 0;
 
        /* Compute control channel rxclear.
         * The cycle delta may be less than the control channel delta.
         * This could be solved by freezing the timers (or an atomic read,
         * if one was available). Checking for the condition should be
         * sufficient.
         */
        if (cycleDelta > ctlBusyDelta) {
            ctlClearDelta = cycleDelta - ctlBusyDelta;
        }
 
        /* Compute ratio of extension channel busy to control channel clear
         * as an approximation to extension channel cleanliness.
         *
         * According to the hardware folks, ext rxclear is undefined
         * if the ctrl rxclear is de-asserted (i.e. busy)
         */
        if (ctlClearDelta) {
            busy = (extBusyDelta * 100) / ctlClearDelta;
        } else {
            busy = 100;
        }
        if (busy > 100) {
            busy = 100;
        }
#if 0
        HALDEBUG(ah, HAL_DEBUG_ANY, "%s: cycleDelta 0x%x, ctlBusyDelta 0x%x, "
             "extBusyDelta 0x%x, ctlClearDelta 0x%x, "
             "busy %d\n",
              __func__, cycleDelta, ctlBusyDelta, extBusyDelta, ctlClearDelta, busy);
#endif
    }
 
    ahp->ah_cycleCount = cycleCount;
    ahp->ah_ctlBusy = ctlBusy;
    ahp->ah_extBusy = extBusy;
 
    return busy;
}
 
/*
 * Configure 20/40 operation
 *
 * 20/40 = joint rx clear (control and extension)
 * 20    = rx clear (control)
 *
 * - NOTE: must stop MAC (tx) and requeue 40 MHz packets as 20 MHz when changing
 *         from 20/40 => 20 only
 */
void
ar5416Set11nMac2040(struct ath_hal *ah, HAL_HT_MACMODE mode)
{
    uint32_t macmode;
 
    /* Configure MAC for 20/40 operation */
    if (mode == HAL_HT_MACMODE_2040) {
        macmode = AR_2040_JOINED_RX_CLEAR;
    } else {
        macmode = 0;
    }
    OS_REG_WRITE(ah, AR_2040_MODE, macmode);
}
 
/*
 * Get Rx clear (control/extension channel)
 *
 * Returns active low (busy) for ctrl/ext channel
 * Owl 2.0
 */
HAL_HT_RXCLEAR
ar5416Get11nRxClear(struct ath_hal *ah)
{
    HAL_HT_RXCLEAR rxclear = 0;
    uint32_t val;
 
    val = OS_REG_READ(ah, AR_DIAG_SW);
 
    /* control channel */
    if (val & AR_DIAG_RXCLEAR_CTL_LOW) {
        rxclear |= HAL_RX_CLEAR_CTL_LOW;
    }
    /* extension channel */
    if (val & AR_DIAG_RXCLEAR_EXT_LOW) {
        rxclear |= HAL_RX_CLEAR_EXT_LOW;
    }
    return rxclear;
}
 
/*
 * Set Rx clear (control/extension channel)
 *
 * Useful for forcing the channel to appear busy for
 * debugging/diagnostics
 * Owl 2.0
 */
void
ar5416Set11nRxClear(struct ath_hal *ah, HAL_HT_RXCLEAR rxclear)
{
    /* control channel */
    if (rxclear & HAL_RX_CLEAR_CTL_LOW) {
        OS_REG_SET_BIT(ah, AR_DIAG_SW, AR_DIAG_RXCLEAR_CTL_LOW);
    } else {
        OS_REG_CLR_BIT(ah, AR_DIAG_SW, AR_DIAG_RXCLEAR_CTL_LOW);
    }
    /* extension channel */
    if (rxclear & HAL_RX_CLEAR_EXT_LOW) {
        OS_REG_SET_BIT(ah, AR_DIAG_SW, AR_DIAG_RXCLEAR_EXT_LOW);
    } else {
        OS_REG_CLR_BIT(ah, AR_DIAG_SW, AR_DIAG_RXCLEAR_EXT_LOW);
    }
}
 
/* XXX shouldn't be here! */
#define TU_TO_USEC(_tu)         ((_tu) << 10)
 
HAL_STATUS
ar5416SetQuiet(struct ath_hal *ah, uint32_t period, uint32_t duration,
    uint32_t nextStart, HAL_QUIET_FLAG flag)
{
        uint32_t period_us = TU_TO_USEC(period); /* convert to us unit */
        uint32_t nextStart_us = TU_TO_USEC(nextStart); /* convert to us unit */
        if (flag & HAL_QUIET_ENABLE) {
                if ((!nextStart) || (flag & HAL_QUIET_ADD_CURRENT_TSF)) {
                        /* Add the nextStart offset to the current TSF */
                        nextStart_us += OS_REG_READ(ah, AR_TSF_L32);
                }
                if (flag & HAL_QUIET_ADD_SWBA_RESP_TIME) {
                        nextStart_us += ah->ah_config.ah_sw_beacon_response_time;
                }
                OS_REG_RMW_FIELD(ah, AR_QUIET1, AR_QUIET1_QUIET_ACK_CTS_ENABLE, 1);
                OS_REG_WRITE(ah, AR_QUIET2, SM(duration, AR_QUIET2_QUIET_DUR));
                OS_REG_WRITE(ah, AR_QUIET_PERIOD, period_us);
                OS_REG_WRITE(ah, AR_NEXT_QUIET, nextStart_us);
                OS_REG_SET_BIT(ah, AR_TIMER_MODE, AR_TIMER_MODE_QUIET);
        } else {
                OS_REG_CLR_BIT(ah, AR_TIMER_MODE, AR_TIMER_MODE_QUIET);
        }
        return HAL_OK;
}
#undef  TU_TO_USEC
 
HAL_STATUS
ar5416GetCapability(struct ath_hal *ah, HAL_CAPABILITY_TYPE type,
        uint32_t capability, uint32_t *result)
{
        switch (type) {
        case HAL_CAP_BB_HANG:
                switch (capability) {
                case HAL_BB_HANG_RIFS:
                        return (AR_SREV_HOWL(ah) || AR_SREV_SOWL(ah)) ? HAL_OK : HAL_ENOTSUPP;
                case HAL_BB_HANG_DFS:
                        return (AR_SREV_HOWL(ah) || AR_SREV_SOWL(ah)) ? HAL_OK : HAL_ENOTSUPP;
                case HAL_BB_HANG_RX_CLEAR:
                        return AR_SREV_MERLIN(ah) ? HAL_OK : HAL_ENOTSUPP;
                }
                break;
        case HAL_CAP_MAC_HANG:
                return ((ah->ah_macVersion == AR_XSREV_VERSION_OWL_PCI) ||
                    (ah->ah_macVersion == AR_XSREV_VERSION_OWL_PCIE) ||
                    AR_SREV_HOWL(ah) || AR_SREV_SOWL(ah)) ?
                        HAL_OK : HAL_ENOTSUPP;
        case HAL_CAP_DIVERSITY:         /* disable classic fast diversity */
                return HAL_ENXIO;
        case HAL_CAP_ENFORCE_TXOP:
                if (capability == 0)
                        return (HAL_OK);
                if (capability != 1)
                        return (HAL_ENOTSUPP);
                (*result) =
                    !! (AH5212(ah)->ah_miscMode & AR_PCU_TXOP_TBTT_LIMIT_ENA);
                return (HAL_OK);
        default:
                break;
        }
        return ar5212GetCapability(ah, type, capability, result);
}
 
HAL_BOOL
ar5416SetCapability(struct ath_hal *ah, HAL_CAPABILITY_TYPE type,
    u_int32_t capability, u_int32_t setting, HAL_STATUS *status)
{
        HAL_CAPABILITIES *pCap = &AH_PRIVATE(ah)->ah_caps;
 
        switch (type) {
        case HAL_CAP_RX_CHAINMASK:
                setting &= ath_hal_eepromGet(ah, AR_EEP_RXMASK, NULL);
                pCap->halRxChainMask = setting;
                if (owl_get_ntxchains(setting) > 2)
                        pCap->halRxStreams = 2;
                else
                        pCap->halRxStreams = 1;
                return AH_TRUE;
        case HAL_CAP_TX_CHAINMASK:
                setting &= ath_hal_eepromGet(ah, AR_EEP_TXMASK, NULL);
                pCap->halTxChainMask = setting;
                if (owl_get_ntxchains(setting) > 2)
                        pCap->halTxStreams = 2;
                else
                        pCap->halTxStreams = 1;
                return AH_TRUE;
        case HAL_CAP_ENFORCE_TXOP:
                if (capability != 1)
                        return AH_FALSE;
                if (setting) {
                        AH5212(ah)->ah_miscMode
                            |= AR_PCU_TXOP_TBTT_LIMIT_ENA;
                        OS_REG_SET_BIT(ah, AR_MISC_MODE,
                            AR_PCU_TXOP_TBTT_LIMIT_ENA);
                } else {
                        AH5212(ah)->ah_miscMode
                            &= ~AR_PCU_TXOP_TBTT_LIMIT_ENA;
                        OS_REG_CLR_BIT(ah, AR_MISC_MODE,
                            AR_PCU_TXOP_TBTT_LIMIT_ENA);
                }
                return AH_TRUE;
        default:
                break;
        }
        return ar5212SetCapability(ah, type, capability, setting, status);
}
 
static int ar5416DetectMacHang(struct ath_hal *ah);
static int ar5416DetectBBHang(struct ath_hal *ah);
 
HAL_BOOL
ar5416GetDiagState(struct ath_hal *ah, int request,
        const void *args, uint32_t argsize,
        void **result, uint32_t *resultsize)
{
        struct ath_hal_5416 *ahp = AH5416(ah);
        int hangs;
 
        if (ath_hal_getdiagstate(ah, request, args, argsize, result, resultsize))
                return AH_TRUE;
        switch (request) {
        case HAL_DIAG_EEPROM:
                return ath_hal_eepromDiag(ah, request,
                    args, argsize, result, resultsize);
        case HAL_DIAG_CHECK_HANGS:
                if (argsize != sizeof(int))
                        return AH_FALSE;
                hangs = *(const int *) args;
                ahp->ah_hangs = 0;
                if (hangs & HAL_BB_HANGS)
                        ahp->ah_hangs |= ar5416DetectBBHang(ah);
                /* NB: if BB is hung MAC will be hung too so skip check */
                if (ahp->ah_hangs == 0 && (hangs & HAL_MAC_HANGS))
                        ahp->ah_hangs |= ar5416DetectMacHang(ah);
                *result = &ahp->ah_hangs;
                *resultsize = sizeof(ahp->ah_hangs);
                return AH_TRUE;
        }
        return ar5212GetDiagState(ah, request,
            args, argsize, result, resultsize);
}
 
HAL_BOOL
ar5416SetRifsDelay(struct ath_hal *ah, const struct ieee80211_channel *chan,
    HAL_BOOL enable)
{
        uint32_t val;
        HAL_BOOL is_chan_2g = AH_FALSE;
        HAL_BOOL is_ht40 = AH_FALSE;
 
        if (chan)
                is_chan_2g = IEEE80211_IS_CHAN_2GHZ(chan);
 
        if (chan)
                is_ht40 = IEEE80211_IS_CHAN_HT40(chan);
 
        /* Only support disabling RIFS delay for now */
        HALASSERT(enable == AH_FALSE);
 
        if (enable == AH_TRUE)
                return AH_FALSE;
 
        /* Change RIFS init delay to 0 */
        val = OS_REG_READ(ah, AR_PHY_HEAVY_CLIP_FACTOR_RIFS);
        val &= ~AR_PHY_RIFS_INIT_DELAY;
        OS_REG_WRITE(ah, AR_PHY_HEAVY_CLIP_FACTOR_RIFS, val);
 
        /*
         * For Owl, RIFS RX parameters are controlled differently;
         * it isn't enabled in the inivals by default.
         *
         * For Sowl/Howl, RIFS RX is enabled in the inivals by default;
         * the following code sets them back to non-RIFS values.
         *
         * For > Sowl/Howl, RIFS RX can be left on by default and so
         * this function shouldn't be called.
         */
        if ((! AR_SREV_SOWL(ah)) && (! AR_SREV_HOWL(ah)))
                return AH_TRUE;
 
        /* Reset search delay to default values */
        if (is_chan_2g)
                if (is_ht40)
                        OS_REG_WRITE(ah, AR_PHY_SEARCH_START_DELAY, 0x268);
                else
                        OS_REG_WRITE(ah, AR_PHY_SEARCH_START_DELAY, 0x134);
        else
                if (is_ht40)
                        OS_REG_WRITE(ah, AR_PHY_SEARCH_START_DELAY, 0x370);
                else
                        OS_REG_WRITE(ah, AR_PHY_SEARCH_START_DELAY, 0x1b8);
 
        return AH_TRUE;
}
 
static HAL_BOOL
ar5416CompareDbgHang(struct ath_hal *ah, const mac_dbg_regs_t *regs,
    const hal_mac_hang_check_t *check)
{
        int found_states;
 
        found_states = 0;
        if (check->states & dcu_chain_state) {
                int i;
 
                for (i = 0; i < 6; i++) {
                        if (((regs->dma_dbg_4 >> (5*i)) & 0x1f) ==
                            check->dcu_chain_state)
                                found_states |= dcu_chain_state;
                }
                for (i = 0; i < 4; i++) {
                        if (((regs->dma_dbg_5 >> (5*i)) & 0x1f) ==
                            check->dcu_chain_state)
                                found_states |= dcu_chain_state;
                }
        }
        if (check->states & dcu_complete_state) { 
                if ((regs->dma_dbg_6 & 0x3) == check->dcu_complete_state)
                        found_states |= dcu_complete_state;
        }
        if (check->states & qcu_stitch_state) { 
                if (((regs->dma_dbg_3 >> 18) & 0xf) == check->qcu_stitch_state)
                        found_states |= qcu_stitch_state;
        }
        if (check->states & qcu_fetch_state) { 
                if (((regs->dma_dbg_3 >> 22) & 0xf) == check->qcu_fetch_state)
                        found_states |= qcu_fetch_state;
        }
        if (check->states & qcu_complete_state) { 
                if (((regs->dma_dbg_3 >> 26) & 0x7) == check->qcu_complete_state)
                        found_states |= qcu_complete_state;
        }
        return (found_states == check->states);
}
 
#define NUM_STATUS_READS 50
 
static int
ar5416DetectMacHang(struct ath_hal *ah)
{
        static const hal_mac_hang_check_t hang_sig1 = {
                .dcu_chain_state        = 0x6,
                .dcu_complete_state     = 0x1,
                .states                 = dcu_chain_state
                                        | dcu_complete_state,
        };
        static const hal_mac_hang_check_t hang_sig2 = {
                .qcu_stitch_state       = 0x9,
                .qcu_fetch_state        = 0x8,
                .qcu_complete_state     = 0x4,
                .states                 = qcu_stitch_state
                                        | qcu_fetch_state
                                        | qcu_complete_state,
        };
        mac_dbg_regs_t mac_dbg;
        int i;
 
        mac_dbg.dma_dbg_3 = OS_REG_READ(ah, AR_DMADBG_3);
        mac_dbg.dma_dbg_4 = OS_REG_READ(ah, AR_DMADBG_4);
        mac_dbg.dma_dbg_5 = OS_REG_READ(ah, AR_DMADBG_5);
        mac_dbg.dma_dbg_6 = OS_REG_READ(ah, AR_DMADBG_6);
        for (i = 1; i <= NUM_STATUS_READS; i++) {
                if (mac_dbg.dma_dbg_3 != OS_REG_READ(ah, AR_DMADBG_3) ||
                    mac_dbg.dma_dbg_4 != OS_REG_READ(ah, AR_DMADBG_4) ||
                    mac_dbg.dma_dbg_5 != OS_REG_READ(ah, AR_DMADBG_5) ||
                    mac_dbg.dma_dbg_6 != OS_REG_READ(ah, AR_DMADBG_6))
                        return 0;
        }
 
        if (ar5416CompareDbgHang(ah, &mac_dbg, &hang_sig1))
                return HAL_MAC_HANG_SIG1;
        if (ar5416CompareDbgHang(ah, &mac_dbg, &hang_sig2))
                return HAL_MAC_HANG_SIG2;
 
        HALDEBUG(ah, HAL_DEBUG_HANG, "%s Found an unknown MAC hang signature "
            "DMADBG_3=0x%x DMADBG_4=0x%x DMADBG_5=0x%x DMADBG_6=0x%x\n",
            __func__, mac_dbg.dma_dbg_3, mac_dbg.dma_dbg_4, mac_dbg.dma_dbg_5,
            mac_dbg.dma_dbg_6);
 
        return 0;
}
 
/*
 * Determine if the baseband using the Observation Bus Register
 */
static int
ar5416DetectBBHang(struct ath_hal *ah)
{
#define N(a) (sizeof(a)/sizeof(a[0]))
        /*
         * Check the PCU Observation Bus 1 register (0x806c)
         * NUM_STATUS_READS times
         *
         * 4 known BB hang signatures -
         * [1] bits 8,9,11 are 0. State machine state (bits 25-31) is 0x1E
         * [2] bits 8,9 are 1, bit 11 is 0. State machine state
         *     (bits 25-31) is 0x52
         * [3] bits 8,9 are 1, bit 11 is 0. State machine state
         *     (bits 25-31) is 0x18
         * [4] bit 10 is 1, bit 11 is 0. WEP state (bits 12-17) is 0x2,
         *     Rx State (bits 20-24) is 0x7.
         */
        static const struct {
                uint32_t val;
                uint32_t mask;
                int code;
        } hang_list[] = {
                /* Reg Value   Reg Mask    Hang Code XXX */
                { 0x1E000000, 0x7E000B00, HAL_BB_HANG_DFS },
                { 0x52000B00, 0x7E000B00, HAL_BB_HANG_RIFS },
                { 0x18000B00, 0x7E000B00, HAL_BB_HANG_RX_CLEAR },
                { 0x00702400, 0x7E7FFFEF, HAL_BB_HANG_RX_CLEAR }
        };
        uint32_t hang_sig;
        int i;
 
        hang_sig = OS_REG_READ(ah, AR_OBSERV_1);
        for (i = 1; i <= NUM_STATUS_READS; i++) {
                if (hang_sig != OS_REG_READ(ah, AR_OBSERV_1))
                        return 0;
        }
        for (i = 0; i < N(hang_list); i++)
                if ((hang_sig & hang_list[i].mask) == hang_list[i].val) {
                        HALDEBUG(ah, HAL_DEBUG_HANG,
                            "%s BB hang, signature 0x%x, code 0x%x\n",
                            __func__, hang_sig, hang_list[i].code);
                        return hang_list[i].code;
                }
 
        HALDEBUG(ah, HAL_DEBUG_HANG, "%s Found an unknown BB hang signature! "
            "<0x806c>=0x%x\n", __func__, hang_sig);
 
        return 0;
#undef N
}
#undef NUM_STATUS_READS