// SPDX-License-Identifier: GPL-2.0-or-later
/******************************************************************************
 *
 *      (C)Copyright 1998,1999 SysKonnect,
 *      a business unit of Schneider & Koch & Co. Datensysteme GmbH.
 *
 *      See the file "skfddi.c" for further information.
 *
 *      The information in this file is provided "AS IS" without warranty.
 *
 ******************************************************************************/

#ifndef lint
static char const ID_sccs[] = "@(#)hwmtm.c      1.40 99/05/31 (C) SK" ;
#endif

#define HWMTM

#ifndef FDDI
#define FDDI
#endif

#include "h/types.h"
#include "h/fddi.h"
#include "h/smc.h"
#include "h/supern_2.h"
#include "h/skfbiinc.h"

/*
        -------------------------------------------------------------
        DOCUMENTATION
        -------------------------------------------------------------
        BEGIN_MANUAL_ENTRY(DOCUMENTATION)

                        T B D

        END_MANUAL_ENTRY
*/
/*
        -------------------------------------------------------------
        LOCAL VARIABLES:
        -------------------------------------------------------------
*/
#ifdef COMMON_MB_POOL
static  SMbuf *mb_start = 0 ;
static  SMbuf *mb_free = 0 ;
static  int mb_init = FALSE ;
static  int call_count = 0 ;
#endif

/*
        -------------------------------------------------------------
        EXTERNE VARIABLES:
        -------------------------------------------------------------
*/

#ifdef  DEBUG
#ifndef DEBUG_BRD
extern  struct smt_debug        debug ;
#endif
#endif

#ifdef  NDIS_OS2
extern  u_char  offDepth ;
extern  u_char  force_irq_pending ;
#endif

/*
        -------------------------------------------------------------
        LOCAL FUNCTIONS:
        -------------------------------------------------------------
*/

static void queue_llc_rx(struct s_smc *smc, SMbuf *mb);
static void smt_to_llc(struct s_smc *smc, SMbuf *mb);
static void init_txd_ring(struct s_smc *smc);
static void init_rxd_ring(struct s_smc *smc);
static void queue_txd_mb(struct s_smc *smc, SMbuf *mb);
static u_long init_descr_ring(struct s_smc *smc, union s_fp_descr volatile *start,
                              int count);
static u_long repair_txd_ring(struct s_smc *smc, struct s_smt_tx_queue *queue);
static u_long repair_rxd_ring(struct s_smc *smc, struct s_smt_rx_queue *queue);
static SMbuf* get_llc_rx(struct s_smc *smc);
static SMbuf* get_txd_mb(struct s_smc *smc);
static void mac_drv_clear_txd(struct s_smc *smc);

/*
        -------------------------------------------------------------
        EXTERNAL FUNCTIONS:
        -------------------------------------------------------------
*/
/*      The external SMT functions are listed in cmtdef.h */

extern void* mac_drv_get_space(struct s_smc *smc, unsigned int size);
extern void* mac_drv_get_desc_mem(struct s_smc *smc, unsigned int size);
extern void mac_drv_fill_rxd(struct s_smc *smc);
extern void mac_drv_tx_complete(struct s_smc *smc,
                                volatile struct s_smt_fp_txd *txd);
extern void mac_drv_rx_complete(struct s_smc *smc,
                                volatile struct s_smt_fp_rxd *rxd,
                                int frag_count, int len);
extern void mac_drv_requeue_rxd(struct s_smc *smc, 
                                volatile struct s_smt_fp_rxd *rxd,
                                int frag_count);
extern void mac_drv_clear_rxd(struct s_smc *smc,
                              volatile struct s_smt_fp_rxd *rxd, int frag_count);

#ifdef  USE_OS_CPY
extern void hwm_cpy_rxd2mb(void);
extern void hwm_cpy_txd2mb(void);
#endif

#ifdef  ALL_RX_COMPLETE
extern void mac_drv_all_receives_complete(void);
#endif

extern u_long mac_drv_virt2phys(struct s_smc *smc, void *virt);
extern u_long dma_master(struct s_smc *smc, void *virt, int len, int flag);

#ifdef  NDIS_OS2
extern void post_proc(void);
#else
extern void dma_complete(struct s_smc *smc, volatile union s_fp_descr *descr,
                         int flag);
#endif

extern int mac_drv_rx_init(struct s_smc *smc, int len, int fc, char *look_ahead,
                           int la_len);

/*
        -------------------------------------------------------------
        PUBLIC FUNCTIONS:
        -------------------------------------------------------------
*/
void process_receive(struct s_smc *smc);
void fddi_isr(struct s_smc *smc);
void smt_free_mbuf(struct s_smc *smc, SMbuf *mb);
void init_driver_fplus(struct s_smc *smc);
void mac_drv_rx_mode(struct s_smc *smc, int mode);
void init_fddi_driver(struct s_smc *smc, u_char *mac_addr);
void mac_drv_clear_tx_queue(struct s_smc *smc);
void mac_drv_clear_rx_queue(struct s_smc *smc);
void hwm_tx_frag(struct s_smc *smc, char far *virt, u_long phys, int len,
                 int frame_status);
void hwm_rx_frag(struct s_smc *smc, char far *virt, u_long phys, int len,
                 int frame_status);

int mac_drv_init(struct s_smc *smc);
int hwm_tx_init(struct s_smc *smc, u_char fc, int frag_count, int frame_len,
                int frame_status);

u_int mac_drv_check_space(void);

SMbuf* smt_get_mbuf(struct s_smc *smc);

#ifdef DEBUG
        void mac_drv_debug_lev(struct s_smc *smc, int flag, int lev);
#endif

/*
        -------------------------------------------------------------
        MACROS:
        -------------------------------------------------------------
*/
#ifndef UNUSED
#ifdef  lint
#define UNUSED(x)       (x) = (x)
#else
#define UNUSED(x)
#endif
#endif

#ifdef  USE_CAN_ADDR
#define MA              smc->hw.fddi_canon_addr.a
#define GROUP_ADDR_BIT  0x01
#else
#define MA              smc->hw.fddi_home_addr.a
#define GROUP_ADDR_BIT  0x80
#endif

#define RXD_TXD_COUNT   (HWM_ASYNC_TXD_COUNT+HWM_SYNC_TXD_COUNT+\
                        SMT_R1_RXD_COUNT+SMT_R2_RXD_COUNT)

#ifdef  MB_OUTSIDE_SMC
#define EXT_VIRT_MEM    ((RXD_TXD_COUNT+1)*sizeof(struct s_smt_fp_txd) +\
                        MAX_MBUF*sizeof(SMbuf))
#define EXT_VIRT_MEM_2  ((RXD_TXD_COUNT+1)*sizeof(struct s_smt_fp_txd))
#else
#define EXT_VIRT_MEM    ((RXD_TXD_COUNT+1)*sizeof(struct s_smt_fp_txd))
#endif

        /*
         * define critical read for 16 Bit drivers
         */
#if     defined(NDIS_OS2) || defined(ODI2)
#define CR_READ(var)    ((var) & 0xffff0000 | ((var) & 0xffff))
#else
#define CR_READ(var)    (__le32)(var)
#endif

#define IMASK_SLOW      (IS_PLINT1 | IS_PLINT2 | IS_TIMINT | IS_TOKEN | \
                         IS_MINTR1 | IS_MINTR2 | IS_MINTR3 | IS_R1_P | \
                         IS_R1_C | IS_XA_C | IS_XS_C)

/*
        -------------------------------------------------------------
        INIT- AND SMT FUNCTIONS:
        -------------------------------------------------------------
*/


/*
 *      BEGIN_MANUAL_ENTRY(mac_drv_check_space)
 *      u_int mac_drv_check_space()
 *
 *      function        DOWNCALL        (drvsr.c)
 *                      This function calculates the needed non virtual
 *                      memory for MBufs, RxD and TxD descriptors etc.
 *                      needed by the driver.
 *
 *      return          u_int   memory in bytes
 *
 *      END_MANUAL_ENTRY
 */
u_int mac_drv_check_space(void)
{
#ifdef  MB_OUTSIDE_SMC
#ifdef  COMMON_MB_POOL
        call_count++ ;
        if (call_count == 1) {
                return EXT_VIRT_MEM;
        }
        else {
                return EXT_VIRT_MEM_2;
        }
#else
        return EXT_VIRT_MEM;
#endif
#else
        return 0;
#endif
}

/*
 *      BEGIN_MANUAL_ENTRY(mac_drv_init)
 *      void mac_drv_init(smc)
 *
 *      function        DOWNCALL        (drvsr.c)
 *                      In this function the hardware module allocates it's
 *                      memory.
 *                      The operating system dependent module should call
 *                      mac_drv_init once, after the adatper is detected.
 *      END_MANUAL_ENTRY
 */
int mac_drv_init(struct s_smc *smc)
{
        if (sizeof(struct s_smt_fp_rxd) % 16) {
                SMT_PANIC(smc,HWM_E0001,HWM_E0001_MSG) ;
        }
        if (sizeof(struct s_smt_fp_txd) % 16) {
                SMT_PANIC(smc,HWM_E0002,HWM_E0002_MSG) ;
        }

        /*
         * get the required memory for the RxDs and TxDs
         */
        if (!(smc->os.hwm.descr_p = (union s_fp_descr volatile *)
                mac_drv_get_desc_mem(smc,(u_int)
                (RXD_TXD_COUNT+1)*sizeof(struct s_smt_fp_txd)))) {
                return 1;       /* no space the hwm modul can't work */
        }

        /*
         * get the memory for the SMT MBufs
         */
#ifndef MB_OUTSIDE_SMC
        smc->os.hwm.mbuf_pool.mb_start=(SMbuf *)(&smc->os.hwm.mbuf_pool.mb[0]) ;
#else
#ifndef COMMON_MB_POOL
        if (!(smc->os.hwm.mbuf_pool.mb_start = (SMbuf *) mac_drv_get_space(smc,
                MAX_MBUF*sizeof(SMbuf)))) {
                return 1;       /* no space the hwm modul can't work */
        }
#else
        if (!mb_start) {
                if (!(mb_start = (SMbuf *) mac_drv_get_space(smc,
                        MAX_MBUF*sizeof(SMbuf)))) {
                        return 1;       /* no space the hwm modul can't work */
                }
        }
#endif
#endif
        return 0;
}

/*
 *      BEGIN_MANUAL_ENTRY(init_driver_fplus)
 *      init_driver_fplus(smc)
 *
 * Sets hardware modul specific values for the mode register 2
 * (e.g. the byte alignment for the received frames, the position of the
 *       least significant byte etc.)
 *      END_MANUAL_ENTRY
 */
void init_driver_fplus(struct s_smc *smc)
{
        smc->hw.fp.mdr2init = FM_LSB | FM_BMMODE | FM_ENNPRQ | FM_ENHSRQ | 3 ;

#ifdef  PCI
        smc->hw.fp.mdr2init |= FM_CHKPAR | FM_PARITY ;
#endif
        smc->hw.fp.mdr3init = FM_MENRQAUNLCK | FM_MENRS ;

#ifdef  USE_CAN_ADDR
        /* enable address bit swapping */
        smc->hw.fp.frselreg_init = FM_ENXMTADSWAP | FM_ENRCVADSWAP ;
#endif
}

static u_long init_descr_ring(struct s_smc *smc,
                              union s_fp_descr volatile *start,
                              int count)
{
        int i ;
        union s_fp_descr volatile *d1 ;
        union s_fp_descr volatile *d2 ;
        u_long  phys ;

        DB_GEN(3, "descr ring starts at = %p", start);
        for (i=count-1, d1=start; i ; i--) {
                d2 = d1 ;
                d1++ ;          /* descr is owned by the host */
                d2->r.rxd_rbctrl = cpu_to_le32(BMU_CHECK) ;
                d2->r.rxd_next = &d1->r ;
                phys = mac_drv_virt2phys(smc,(void *)d1) ;
                d2->r.rxd_nrdadr = cpu_to_le32(phys) ;
        }
        DB_GEN(3, "descr ring ends at = %p", d1);
        d1->r.rxd_rbctrl = cpu_to_le32(BMU_CHECK) ;
        d1->r.rxd_next = &start->r ;
        phys = mac_drv_virt2phys(smc,(void *)start) ;
        d1->r.rxd_nrdadr = cpu_to_le32(phys) ;

        for (i=count, d1=start; i ; i--) {
                DRV_BUF_FLUSH(&d1->r,DDI_DMA_SYNC_FORDEV) ;
                d1++;
        }
        return phys;
}

static void init_txd_ring(struct s_smc *smc)
{
        struct s_smt_fp_txd volatile *ds ;
        struct s_smt_tx_queue *queue ;
        u_long  phys ;

        /*
         * initialize the transmit descriptors
         */
        ds = (struct s_smt_fp_txd volatile *) ((char *)smc->os.hwm.descr_p +
                SMT_R1_RXD_COUNT*sizeof(struct s_smt_fp_rxd)) ;
        queue = smc->hw.fp.tx[QUEUE_A0] ;
        DB_GEN(3, "Init async TxD ring, %d TxDs", HWM_ASYNC_TXD_COUNT);
        (void)init_descr_ring(smc,(union s_fp_descr volatile *)ds,
                HWM_ASYNC_TXD_COUNT) ;
        phys = le32_to_cpu(ds->txd_ntdadr) ;
        ds++ ;
        queue->tx_curr_put = queue->tx_curr_get = ds ;
        ds-- ;
        queue->tx_free = HWM_ASYNC_TXD_COUNT ;
        queue->tx_used = 0 ;
        outpd(ADDR(B5_XA_DA),phys) ;

        ds = (struct s_smt_fp_txd volatile *) ((char *)ds +
                HWM_ASYNC_TXD_COUNT*sizeof(struct s_smt_fp_txd)) ;
        queue = smc->hw.fp.tx[QUEUE_S] ;
        DB_GEN(3, "Init sync TxD ring, %d TxDs", HWM_SYNC_TXD_COUNT);
        (void)init_descr_ring(smc,(union s_fp_descr volatile *)ds,
                HWM_SYNC_TXD_COUNT) ;
        phys = le32_to_cpu(ds->txd_ntdadr) ;
        ds++ ;
        queue->tx_curr_put = queue->tx_curr_get = ds ;
        queue->tx_free = HWM_SYNC_TXD_COUNT ;
        queue->tx_used = 0 ;
        outpd(ADDR(B5_XS_DA),phys) ;
}

static void init_rxd_ring(struct s_smc *smc)
{
        struct s_smt_fp_rxd volatile *ds ;
        struct s_smt_rx_queue *queue ;
        u_long  phys ;

        /*
         * initialize the receive descriptors
         */
        ds = (struct s_smt_fp_rxd volatile *) smc->os.hwm.descr_p ;
        queue = smc->hw.fp.rx[QUEUE_R1] ;
        DB_GEN(3, "Init RxD ring, %d RxDs", SMT_R1_RXD_COUNT);
        (void)init_descr_ring(smc,(union s_fp_descr volatile *)ds,
                SMT_R1_RXD_COUNT) ;
        phys = le32_to_cpu(ds->rxd_nrdadr) ;
        ds++ ;
        queue->rx_curr_put = queue->rx_curr_get = ds ;
        queue->rx_free = SMT_R1_RXD_COUNT ;
        queue->rx_used = 0 ;
        outpd(ADDR(B4_R1_DA),phys) ;
}

/*
 *      BEGIN_MANUAL_ENTRY(init_fddi_driver)
 *      void init_fddi_driver(smc,mac_addr)
 *
 * initializes the driver and it's variables
 *
 *      END_MANUAL_ENTRY
 */
void init_fddi_driver(struct s_smc *smc, u_char *mac_addr)
{
        SMbuf   *mb ;
        int     i ;

        init_board(smc,mac_addr) ;
        (void)init_fplus(smc) ;

        /*
         * initialize the SMbufs for the SMT
         */
#ifndef COMMON_MB_POOL
        mb = smc->os.hwm.mbuf_pool.mb_start ;
        smc->os.hwm.mbuf_pool.mb_free = (SMbuf *)NULL ;
        for (i = 0; i < MAX_MBUF; i++) {
                mb->sm_use_count = 1 ;
                smt_free_mbuf(smc,mb)   ;
                mb++ ;
        }
#else
        mb = mb_start ;
        if (!mb_init) {
                mb_free = 0 ;
                for (i = 0; i < MAX_MBUF; i++) {
                        mb->sm_use_count = 1 ;
                        smt_free_mbuf(smc,mb)   ;
                        mb++ ;
                }
                mb_init = TRUE ;
        }
#endif

        /*
         * initialize the other variables
         */
        smc->os.hwm.llc_rx_pipe = smc->os.hwm.llc_rx_tail = (SMbuf *)NULL ;
        smc->os.hwm.txd_tx_pipe = smc->os.hwm.txd_tx_tail = NULL ;
        smc->os.hwm.pass_SMT = smc->os.hwm.pass_NSA = smc->os.hwm.pass_DB = 0 ;
        smc->os.hwm.pass_llc_promisc = TRUE ;
        smc->os.hwm.queued_rx_frames = smc->os.hwm.queued_txd_mb = 0 ;
        smc->os.hwm.detec_count = 0 ;
        smc->os.hwm.rx_break = 0 ;
        smc->os.hwm.rx_len_error = 0 ;
        smc->os.hwm.isr_flag = FALSE ;

        /*
         * make sure that the start pointer is 16 byte aligned
         */
        i = 16 - ((long)smc->os.hwm.descr_p & 0xf) ;
        if (i != 16) {
                DB_GEN(3, "i = %d", i);
                smc->os.hwm.descr_p = (union s_fp_descr volatile *)
                        ((char *)smc->os.hwm.descr_p+i) ;
        }
        DB_GEN(3, "pt to descr area = %p", smc->os.hwm.descr_p);

        init_txd_ring(smc) ;
        init_rxd_ring(smc) ;
        mac_drv_fill_rxd(smc) ;

        init_plc(smc) ;
}


SMbuf *smt_get_mbuf(struct s_smc *smc)
{
        register SMbuf  *mb ;

#ifndef COMMON_MB_POOL
        mb = smc->os.hwm.mbuf_pool.mb_free ;
#else
        mb = mb_free ;
#endif
        if (mb) {
#ifndef COMMON_MB_POOL
                smc->os.hwm.mbuf_pool.mb_free = mb->sm_next ;
#else
                mb_free = mb->sm_next ;
#endif
                mb->sm_off = 8 ;
                mb->sm_use_count = 1 ;
        }
        DB_GEN(3, "get SMbuf: mb = %p", mb);
        return mb;      /* May be NULL */
}

void smt_free_mbuf(struct s_smc *smc, SMbuf *mb)
{

        if (mb) {
                mb->sm_use_count-- ;
                DB_GEN(3, "free_mbuf: sm_use_count = %d", mb->sm_use_count);
                /*
                 * If the use_count is != zero the MBuf is queued
                 * more than once and must not queued into the
                 * free MBuf queue
                 */
                if (!mb->sm_use_count) {
                        DB_GEN(3, "free SMbuf: mb = %p", mb);
#ifndef COMMON_MB_POOL
                        mb->sm_next = smc->os.hwm.mbuf_pool.mb_free ;
                        smc->os.hwm.mbuf_pool.mb_free = mb ;
#else
                        mb->sm_next = mb_free ;
                        mb_free = mb ;
#endif
                }
        }
        else
                SMT_PANIC(smc,HWM_E0003,HWM_E0003_MSG) ;
}


/*
 *      BEGIN_MANUAL_ENTRY(mac_drv_repair_descr)
 *      void mac_drv_repair_descr(smc)
 *
 * function     called from SMT (HWM / hwmtm.c)
 *              The BMU is idle when this function is called.
 *              Mac_drv_repair_descr sets up the physical address
 *              for all receive and transmit queues where the BMU
 *              should continue.
 *              It may be that the BMU was reseted during a fragmented
 *              transfer. In this case there are some fragments which will
 *              never completed by the BMU. The OWN bit of this fragments
 *              must be switched to be owned by the host.
 *
 *              Give a start command to the receive BMU.
 *              Start the transmit BMUs if transmit frames pending.
 *
 *      END_MANUAL_ENTRY
 */
void mac_drv_repair_descr(struct s_smc *smc)
{
        u_long  phys ;

        if (smc->hw.hw_state != STOPPED) {
                SK_BREAK() ;
                SMT_PANIC(smc,HWM_E0013,HWM_E0013_MSG) ;
                return ;
        }

        /*
         * repair tx queues: don't start
         */
        phys = repair_txd_ring(smc,smc->hw.fp.tx[QUEUE_A0]) ;
        outpd(ADDR(B5_XA_DA),phys) ;
        if (smc->hw.fp.tx_q[QUEUE_A0].tx_used) {
                outpd(ADDR(B0_XA_CSR),CSR_START) ;
        }
        phys = repair_txd_ring(smc,smc->hw.fp.tx[QUEUE_S]) ;
        outpd(ADDR(B5_XS_DA),phys) ;
        if (smc->hw.fp.tx_q[QUEUE_S].tx_used) {
                outpd(ADDR(B0_XS_CSR),CSR_START) ;
        }

        /*
         * repair rx queues
         */
        phys = repair_rxd_ring(smc,smc->hw.fp.rx[QUEUE_R1]) ;
        outpd(ADDR(B4_R1_DA),phys) ;
        outpd(ADDR(B0_R1_CSR),CSR_START) ;
}

static u_long repair_txd_ring(struct s_smc *smc, struct s_smt_tx_queue *queue)
{
        int i ;
        int tx_used ;
        u_long phys ;
        u_long tbctrl ;
        struct s_smt_fp_txd volatile *t ;

        SK_UNUSED(smc) ;

        t = queue->tx_curr_get ;
        tx_used = queue->tx_used ;
        for (i = tx_used+queue->tx_free-1 ; i ; i-- ) {
                t = t->txd_next ;
        }
        phys = le32_to_cpu(t->txd_ntdadr) ;

        t = queue->tx_curr_get ;
        while (tx_used) {
                DRV_BUF_FLUSH(t,DDI_DMA_SYNC_FORCPU) ;
                tbctrl = le32_to_cpu(t->txd_tbctrl) ;

                if (tbctrl & BMU_OWN) {
                        if (tbctrl & BMU_STF) {
                                break ;         /* exit the loop */
                        }
                        else {
                                /*
                                 * repair the descriptor
                                 */
                                t->txd_tbctrl &= ~cpu_to_le32(BMU_OWN) ;
                        }
                }
                phys = le32_to_cpu(t->txd_ntdadr) ;
                DRV_BUF_FLUSH(t,DDI_DMA_SYNC_FORDEV) ;
                t = t->txd_next ;
                tx_used-- ;
        }
        return phys;
}

/*
 * Repairs the receive descriptor ring and returns the physical address
 * where the BMU should continue working.
 *
 *      o The physical address where the BMU was stopped has to be
 *        determined. This is the next RxD after rx_curr_get with an OWN
 *        bit set.
 *      o The BMU should start working at beginning of the next frame.
 *        RxDs with an OWN bit set but with a reset STF bit should be
 *        skipped and owned by the driver (OWN = 0). 
 */
static u_long repair_rxd_ring(struct s_smc *smc, struct s_smt_rx_queue *queue)
{
        int i ;
        int rx_used ;
        u_long phys ;
        u_long rbctrl ;
        struct s_smt_fp_rxd volatile *r ;

        SK_UNUSED(smc) ;

        r = queue->rx_curr_get ;
        rx_used = queue->rx_used ;
        for (i = SMT_R1_RXD_COUNT-1 ; i ; i-- ) {
                r = r->rxd_next ;
        }
        phys = le32_to_cpu(r->rxd_nrdadr) ;

        r = queue->rx_curr_get ;
        while (rx_used) {
                DRV_BUF_FLUSH(r,DDI_DMA_SYNC_FORCPU) ;
                rbctrl = le32_to_cpu(r->rxd_rbctrl) ;

                if (rbctrl & BMU_OWN) {
                        if (rbctrl & BMU_STF) {
                                break ;         /* exit the loop */
                        }
                        else {
                                /*
                                 * repair the descriptor
                                 */
                                r->rxd_rbctrl &= ~cpu_to_le32(BMU_OWN) ;
                        }
                }
                phys = le32_to_cpu(r->rxd_nrdadr) ;
                DRV_BUF_FLUSH(r,DDI_DMA_SYNC_FORDEV) ;
                r = r->rxd_next ;
                rx_used-- ;
        }
        return phys;
}


/*
        -------------------------------------------------------------
        INTERRUPT SERVICE ROUTINE:
        -------------------------------------------------------------
*/

/*
 *      BEGIN_MANUAL_ENTRY(fddi_isr)
 *      void fddi_isr(smc)
 *
 * function     DOWNCALL        (drvsr.c)
 *              interrupt service routine, handles the interrupt requests
 *              generated by the FDDI adapter.
 *
 * NOTE:        The operating system dependent module must guarantee that the
 *              interrupts of the adapter are disabled when it calls fddi_isr.
 *
 *      About the USE_BREAK_ISR mechanismn:
 *
 *      The main requirement of this mechanismn is to force an timer IRQ when
 *      leaving process_receive() with leave_isr set. process_receive() may
 *      be called at any time from anywhere!
 *      To be sure we don't miss such event we set 'force_irq' per default.
 *      We have to force and Timer IRQ if 'smc->os.hwm.leave_isr' AND
 *      'force_irq' are set. 'force_irq' may be reset if a receive complete
 *      IRQ is pending.
 *
 *      END_MANUAL_ENTRY
 */
void fddi_isr(struct s_smc *smc)
{
        u_long          is ;            /* ISR source */
        u_short         stu, stl ;
        SMbuf           *mb ;

#ifdef  USE_BREAK_ISR
        int     force_irq ;
#endif

#ifdef  ODI2
        if (smc->os.hwm.rx_break) {
                mac_drv_fill_rxd(smc) ;
                if (smc->hw.fp.rx_q[QUEUE_R1].rx_used > 0) {
                        smc->os.hwm.rx_break = 0 ;
                        process_receive(smc) ;
                }
                else {
                        smc->os.hwm.detec_count = 0 ;
                        smt_force_irq(smc) ;
                }
        }
#endif
        smc->os.hwm.isr_flag = TRUE ;

#ifdef  USE_BREAK_ISR
        force_irq = TRUE ;
        if (smc->os.hwm.leave_isr) {
                smc->os.hwm.leave_isr = FALSE ;
                process_receive(smc) ;
        }
#endif

        while ((is = GET_ISR() & ISR_MASK)) {
                NDD_TRACE("CH0B",is,0,0) ;
                DB_GEN(7, "ISA = 0x%lx", is);

                if (is & IMASK_SLOW) {
                        NDD_TRACE("CH1b",is,0,0) ;
                        if (is & IS_PLINT1) {   /* PLC1 */
                                plc1_irq(smc) ;
                        }
                        if (is & IS_PLINT2) {   /* PLC2 */
                                plc2_irq(smc) ;
                        }
                        if (is & IS_MINTR1) {   /* FORMAC+ STU1(U/L) */
                                stu = inpw(FM_A(FM_ST1U)) ;
                                stl = inpw(FM_A(FM_ST1L)) ;
                                DB_GEN(6, "Slow transmit complete");
                                mac1_irq(smc,stu,stl) ;
                        }
                        if (is & IS_MINTR2) {   /* FORMAC+ STU2(U/L) */
                                stu= inpw(FM_A(FM_ST2U)) ;
                                stl= inpw(FM_A(FM_ST2L)) ;
                                DB_GEN(6, "Slow receive complete");
                                DB_GEN(7, "stl = %x : stu = %x", stl, stu);
                                mac2_irq(smc,stu,stl) ;
                        }
                        if (is & IS_MINTR3) {   /* FORMAC+ STU3(U/L) */
                                stu= inpw(FM_A(FM_ST3U)) ;
                                stl= inpw(FM_A(FM_ST3L)) ;
                                DB_GEN(6, "FORMAC Mode Register 3");
                                mac3_irq(smc,stu,stl) ;
                        }
                        if (is & IS_TIMINT) {   /* Timer 82C54-2 */
                                timer_irq(smc) ;
#ifdef  NDIS_OS2
                                force_irq_pending = 0 ;
#endif
                                /*
                                 * out of RxD detection
                                 */
                                if (++smc->os.hwm.detec_count > 4) {
                                        /*
                                         * check out of RxD condition
                                         */
                                         process_receive(smc) ;
                                }
                        }
                        if (is & IS_TOKEN) {    /* Restricted Token Monitor */
                                rtm_irq(smc) ;
                        }
                        if (is & IS_R1_P) {     /* Parity error rx queue 1 */
                                /* clear IRQ */
                                outpd(ADDR(B4_R1_CSR),CSR_IRQ_CL_P) ;
                                SMT_PANIC(smc,HWM_E0004,HWM_E0004_MSG) ;
                        }
                        if (is & IS_R1_C) {     /* Encoding error rx queue 1 */
                                /* clear IRQ */
                                outpd(ADDR(B4_R1_CSR),CSR_IRQ_CL_C) ;
                                SMT_PANIC(smc,HWM_E0005,HWM_E0005_MSG) ;
                        }
                        if (is & IS_XA_C) {     /* Encoding error async tx q */
                                /* clear IRQ */
                                outpd(ADDR(B5_XA_CSR),CSR_IRQ_CL_C) ;
                                SMT_PANIC(smc,HWM_E0006,HWM_E0006_MSG) ;
                        }
                        if (is & IS_XS_C) {     /* Encoding error sync tx q */
                                /* clear IRQ */
                                outpd(ADDR(B5_XS_CSR),CSR_IRQ_CL_C) ;
                                SMT_PANIC(smc,HWM_E0007,HWM_E0007_MSG) ;
                        }
                }

                /*
                 *      Fast Tx complete Async/Sync Queue (BMU service)
                 */
                if (is & (IS_XS_F|IS_XA_F)) {
                        DB_GEN(6, "Fast tx complete queue");
                        /*
                         * clear IRQ, Note: no IRQ is lost, because
                         *      we always service both queues
                         */
                        outpd(ADDR(B5_XS_CSR),CSR_IRQ_CL_F) ;
                        outpd(ADDR(B5_XA_CSR),CSR_IRQ_CL_F) ;
                        mac_drv_clear_txd(smc) ;
                        llc_restart_tx(smc) ;
                }

                /*
                 *      Fast Rx Complete (BMU service)
                 */
                if (is & IS_R1_F) {
                        DB_GEN(6, "Fast receive complete");
                        /* clear IRQ */
#ifndef USE_BREAK_ISR
                        outpd(ADDR(B4_R1_CSR),CSR_IRQ_CL_F) ;
                        process_receive(smc) ;
#else
                        process_receive(smc) ;
                        if (smc->os.hwm.leave_isr) {
                                force_irq = FALSE ;
                        } else {
                                outpd(ADDR(B4_R1_CSR),CSR_IRQ_CL_F) ;
                                process_receive(smc) ;
                        }
#endif
                }

#ifndef NDIS_OS2
                while ((mb = get_llc_rx(smc))) {
                        smt_to_llc(smc,mb) ;
                }
#else
                if (offDepth)
                        post_proc() ;

                while (!offDepth && (mb = get_llc_rx(smc))) {
                        smt_to_llc(smc,mb) ;
                }

                if (!offDepth && smc->os.hwm.rx_break) {
                        process_receive(smc) ;
                }
#endif
                if (smc->q.ev_get != smc->q.ev_put) {
                        NDD_TRACE("CH2a",0,0,0) ;
                        ev_dispatcher(smc) ;
                }
#ifdef  NDIS_OS2
                post_proc() ;
                if (offDepth) {         /* leave fddi_isr because */
                        break ;         /* indications not allowed */
                }
#endif
#ifdef  USE_BREAK_ISR
                if (smc->os.hwm.leave_isr) {
                        break ;         /* leave fddi_isr */
                }
#endif

                /* NOTE: when the isr is left, no rx is pending */
        }       /* end of interrupt source polling loop */

#ifdef  USE_BREAK_ISR
        if (smc->os.hwm.leave_isr && force_irq) {
                smt_force_irq(smc) ;
        }
#endif
        smc->os.hwm.isr_flag = FALSE ;
        NDD_TRACE("CH0E",0,0,0) ;
}


/*
        -------------------------------------------------------------
        RECEIVE FUNCTIONS:
        -------------------------------------------------------------
*/

#ifndef NDIS_OS2
/*
 *      BEGIN_MANUAL_ENTRY(mac_drv_rx_mode)
 *      void mac_drv_rx_mode(smc,mode)
 *
 * function     DOWNCALL        (fplus.c)
 *              Corresponding to the parameter mode, the operating system
 *              dependent module can activate several receive modes.
 *
 * para mode    = 1:    RX_ENABLE_ALLMULTI      enable all multicasts
 *              = 2:    RX_DISABLE_ALLMULTI     disable "enable all multicasts"
 *              = 3:    RX_ENABLE_PROMISC       enable promiscuous
 *              = 4:    RX_DISABLE_PROMISC      disable promiscuous
 *              = 5:    RX_ENABLE_NSA           enable rec. of all NSA frames
 *                      (disabled after 'driver reset' & 'set station address')
 *              = 6:    RX_DISABLE_NSA          disable rec. of all NSA frames
 *
 *              = 21:   RX_ENABLE_PASS_SMT      ( see description )
 *              = 22:   RX_DISABLE_PASS_SMT     (  "       "      )
 *              = 23:   RX_ENABLE_PASS_NSA      (  "       "      )
 *              = 24:   RX_DISABLE_PASS_NSA     (  "       "      )
 *              = 25:   RX_ENABLE_PASS_DB       (  "       "      )
 *              = 26:   RX_DISABLE_PASS_DB      (  "       "      )
 *              = 27:   RX_DISABLE_PASS_ALL     (  "       "      )
 *              = 28:   RX_DISABLE_LLC_PROMISC  (  "       "      )
 *              = 29:   RX_ENABLE_LLC_PROMISC   (  "       "      )
 *
 *
 *              RX_ENABLE_PASS_SMT / RX_DISABLE_PASS_SMT
 *
 *              If the operating system dependent module activates the
 *              mode RX_ENABLE_PASS_SMT, the hardware module
 *              duplicates all SMT frames with the frame control
 *              FC_SMT_INFO and passes them to the LLC receive channel
 *              by calling mac_drv_rx_init.
 *              The SMT Frames which are sent by the local SMT and the NSA
 *              frames whose A- and C-Indicator is not set are also duplicated
 *              and passed.
 *              The receive mode RX_DISABLE_PASS_SMT disables the passing
 *              of SMT frames.
 *
 *              RX_ENABLE_PASS_NSA / RX_DISABLE_PASS_NSA
 *
 *              If the operating system dependent module activates the
 *              mode RX_ENABLE_PASS_NSA, the hardware module
 *              duplicates all NSA frames with frame control FC_SMT_NSA
 *              and a set A-Indicator and passed them to the LLC
 *              receive channel by calling mac_drv_rx_init.
 *              All NSA Frames which are sent by the local SMT
 *              are also duplicated and passed.
 *              The receive mode RX_DISABLE_PASS_NSA disables the passing
 *              of NSA frames with the A- or C-Indicator set.
 *
 * NOTE:        For fear that the hardware module receives NSA frames with
 *              a reset A-Indicator, the operating system dependent module
 *              has to call mac_drv_rx_mode with the mode RX_ENABLE_NSA
 *              before activate the RX_ENABLE_PASS_NSA mode and after every
 *              'driver reset' and 'set station address'.
 *
 *              RX_ENABLE_PASS_DB / RX_DISABLE_PASS_DB
 *
 *              If the operating system dependent module activates the
 *              mode RX_ENABLE_PASS_DB, direct BEACON frames
 *              (FC_BEACON frame control) are passed to the LLC receive
 *              channel by mac_drv_rx_init.
 *              The receive mode RX_DISABLE_PASS_DB disables the passing
 *              of direct BEACON frames.
 *
 *              RX_DISABLE_PASS_ALL
 *
 *              Disables all special receives modes. It is equal to
 *              call mac_drv_set_rx_mode successively with the
 *              parameters RX_DISABLE_NSA, RX_DISABLE_PASS_SMT,
 *              RX_DISABLE_PASS_NSA and RX_DISABLE_PASS_DB.
 *
 *              RX_ENABLE_LLC_PROMISC
 *
 *              (default) all received LLC frames and all SMT/NSA/DBEACON
 *              frames depending on the attitude of the flags
 *              PASS_SMT/PASS_NSA/PASS_DBEACON will be delivered to the
 *              LLC layer
 *
 *              RX_DISABLE_LLC_PROMISC
 *
 *              all received SMT/NSA/DBEACON frames depending on the
 *              attitude of the flags PASS_SMT/PASS_NSA/PASS_DBEACON
 *              will be delivered to the LLC layer.
 *              all received LLC frames with a directed address, Multicast
 *              or Broadcast address will be delivered to the LLC
 *              layer too.
 *
 *      END_MANUAL_ENTRY
 */
void mac_drv_rx_mode(struct s_smc *smc, int mode)
{
        switch(mode) {
        case RX_ENABLE_PASS_SMT:
                smc->os.hwm.pass_SMT = TRUE ;
                break ;
        case RX_DISABLE_PASS_SMT:
                smc->os.hwm.pass_SMT = FALSE ;
                break ;
        case RX_ENABLE_PASS_NSA:
                smc->os.hwm.pass_NSA = TRUE ;
                break ;
        case RX_DISABLE_PASS_NSA:

                smc->os.hwm.pass_NSA = FALSE ;
                break ;
        case RX_ENABLE_PASS_DB:
                smc->os.hwm.pass_DB = TRUE ;
                break ;
        case RX_DISABLE_PASS_DB:
                smc->os.hwm.pass_DB = FALSE ;
                break ;
        case RX_DISABLE_PASS_ALL:
                smc->os.hwm.pass_SMT = smc->os.hwm.pass_NSA = FALSE ;
                smc->os.hwm.pass_DB = FALSE ;
                smc->os.hwm.pass_llc_promisc = TRUE ;
                mac_set_rx_mode(smc,RX_DISABLE_NSA) ;
                break ;
        case RX_DISABLE_LLC_PROMISC:
                smc->os.hwm.pass_llc_promisc = FALSE ;
                break ;
        case RX_ENABLE_LLC_PROMISC:
                smc->os.hwm.pass_llc_promisc = TRUE ;
                break ;
        case RX_ENABLE_ALLMULTI:
        case RX_DISABLE_ALLMULTI:
        case RX_ENABLE_PROMISC:
        case RX_DISABLE_PROMISC:
        case RX_ENABLE_NSA:
        case RX_DISABLE_NSA:
        default:
                mac_set_rx_mode(smc,mode) ;
                break ;
        }
}
#endif  /* ifndef NDIS_OS2 */

/*
 * process receive queue
 */
void process_receive(struct s_smc *smc)
{
        int i ;
        int n ;
        int frag_count ;                /* number of RxDs of the curr rx buf */
        int used_frags ;                /* number of RxDs of the curr frame */
        struct s_smt_rx_queue *queue ;  /* points to the queue ctl struct */
        struct s_smt_fp_rxd volatile *r ;       /* rxd pointer */
        struct s_smt_fp_rxd volatile *rxd ;     /* first rxd of rx frame */
        u_long rbctrl ;                 /* receive buffer control word */
        u_long rfsw ;                   /* receive frame status word */
        u_short rx_used ;
        u_char far *virt ;
        char far *data ;
        SMbuf *mb ;
        u_char fc ;                     /* Frame control */
        int len ;                       /* Frame length */

        smc->os.hwm.detec_count = 0 ;
        queue = smc->hw.fp.rx[QUEUE_R1] ;
        NDD_TRACE("RHxB",0,0,0) ;
        for ( ; ; ) {
                r = queue->rx_curr_get ;
                rx_used = queue->rx_used ;
                frag_count = 0 ;

#ifdef  USE_BREAK_ISR
                if (smc->os.hwm.leave_isr) {
                        goto rx_end ;
                }
#endif
#ifdef  NDIS_OS2
                if (offDepth) {
                        smc->os.hwm.rx_break = 1 ;
                        goto rx_end ;
                }
                smc->os.hwm.rx_break = 0 ;
#endif
#ifdef  ODI2
                if (smc->os.hwm.rx_break) {
                        goto rx_end ;
                }
#endif
                n = 0 ;
                do {
                        DB_RX(5, "Check RxD %p for OWN and EOF", r);
                        DRV_BUF_FLUSH(r,DDI_DMA_SYNC_FORCPU) ;
                        rbctrl = le32_to_cpu(CR_READ(r->rxd_rbctrl));

                        if (rbctrl & BMU_OWN) {
                                NDD_TRACE("RHxE",r,rfsw,rbctrl) ;
                                DB_RX(4, "End of RxDs");
                                goto rx_end ;
                        }
                        /*
                         * out of RxD detection
                         */
                        if (!rx_used) {
                                SK_BREAK() ;
                                SMT_PANIC(smc,HWM_E0009,HWM_E0009_MSG) ;
                                /* Either we don't have an RxD or all
                                 * RxDs are filled. Therefore it's allowed
                                 * for to set the STOPPED flag */
                                smc->hw.hw_state = STOPPED ;
                                mac_drv_clear_rx_queue(smc) ;
                                smc->hw.hw_state = STARTED ;
                                mac_drv_fill_rxd(smc) ;
                                smc->os.hwm.detec_count = 0 ;
                                goto rx_end ;
                        }
                        rfsw = le32_to_cpu(r->rxd_rfsw) ;
                        if ((rbctrl & BMU_STF) != ((rbctrl & BMU_ST_BUF) <<5)) {
                                /*
                                 * The BMU_STF bit is deleted, 1 frame is
                                 * placed into more than 1 rx buffer
                                 *
                                 * skip frame by setting the rx len to 0
                                 *
                                 * if fragment count == 0
                                 *      The missing STF bit belongs to the
                                 *      current frame, search for the
                                 *      EOF bit to complete the frame
                                 * else
                                 *      the fragment belongs to the next frame,
                                 *      exit the loop and process the frame
                                 */
                                SK_BREAK() ;
                                rfsw = 0 ;
                                if (frag_count) {
                                        break ;
                                }
                        }
                        n += rbctrl & 0xffff ;
                        r = r->rxd_next ;
                        frag_count++ ;
                        rx_used-- ;
                } while (!(rbctrl & BMU_EOF)) ;
                used_frags = frag_count ;
                DB_RX(5, "EOF set in RxD, used_frags = %d", used_frags);

                /* may be next 2 DRV_BUF_FLUSH() can be skipped, because */
                /* BMU_ST_BUF will not be changed by the ASIC */
                DRV_BUF_FLUSH(r,DDI_DMA_SYNC_FORCPU) ;
                while (rx_used && !(r->rxd_rbctrl & cpu_to_le32(BMU_ST_BUF))) {
                        DB_RX(5, "Check STF bit in %p", r);
                        r = r->rxd_next ;
                        DRV_BUF_FLUSH(r,DDI_DMA_SYNC_FORCPU) ;
                        frag_count++ ;
                        rx_used-- ;
                }
                DB_RX(5, "STF bit found");

                /*
                 * The received frame is finished for the process receive
                 */
                rxd = queue->rx_curr_get ;
                queue->rx_curr_get = r ;
                queue->rx_free += frag_count ;
                queue->rx_used = rx_used ;

                /*
                 * ASIC Errata no. 7 (STF - Bit Bug)
                 */
                rxd->rxd_rbctrl &= cpu_to_le32(~BMU_STF) ;

                for (r=rxd, i=frag_count ; i ; r=r->rxd_next, i--){
                        DB_RX(5, "dma_complete for RxD %p", r);
                        dma_complete(smc,(union s_fp_descr volatile *)r,DMA_WR);
                }
                smc->hw.fp.err_stats.err_valid++ ;
                smc->mib.m[MAC0].fddiMACCopied_Ct++ ;

                /* the length of the data including the FC */
                len = (rfsw & RD_LENGTH) - 4 ;

                DB_RX(4, "frame length = %d", len);
                /*
                 * check the frame_length and all error flags
                 */
                if (rfsw & (RX_MSRABT|RX_FS_E|RX_FS_CRC|RX_FS_IMPL)){
                        if (rfsw & RD_S_MSRABT) {
                                DB_RX(2, "Frame aborted by the FORMAC");
                                smc->hw.fp.err_stats.err_abort++ ;
                        }
                        /*
                         * check frame status
                         */
                        if (rfsw & RD_S_SEAC2) {
                                DB_RX(2, "E-Indicator set");
                                smc->hw.fp.err_stats.err_e_indicator++ ;
                        }
                        if (rfsw & RD_S_SFRMERR) {
                                DB_RX(2, "CRC error");
                                smc->hw.fp.err_stats.err_crc++ ;
                        }
                        if (rfsw & RX_FS_IMPL) {
                                DB_RX(2, "Implementer frame");
                                smc->hw.fp.err_stats.err_imp_frame++ ;
                        }
                        goto abort_frame ;
                }
                if (len > FDDI_RAW_MTU-4) {
                        DB_RX(2, "Frame too long error");
                        smc->hw.fp.err_stats.err_too_long++ ;
                        goto abort_frame ;
                }
                /*
                 * SUPERNET 3 Bug: FORMAC delivers status words
                 * of aborted frames to the BMU
                 */
                if (len <= 4) {
                        DB_RX(2, "Frame length = 0");
                        goto abort_frame ;
                }

                if (len != (n-4)) {
                        DB_RX(4, "BMU: rx len differs: [%d:%d]", len, n);
                        smc->os.hwm.rx_len_error++ ;
                        goto abort_frame ;
                }

                /*
                 * Check SA == MA
                 */
                virt = (u_char far *) rxd->rxd_virt ;
                DB_RX(2, "FC = %x", *virt);
                if (virt[12] == MA[5] &&
                    virt[11] == MA[4] &&
                    virt[10] == MA[3] &&
                    virt[9] == MA[2] &&
                    virt[8] == MA[1] &&
                    (virt[7] & ~GROUP_ADDR_BIT) == MA[0]) {
                        goto abort_frame ;
                }

                /*
                 * test if LLC frame
                 */
                if (rfsw & RX_FS_LLC) {
                        /*
                         * if pass_llc_promisc is disable
                         *      if DA != Multicast or Broadcast or DA!=MA
                         *              abort the frame
                         */
                        if (!smc->os.hwm.pass_llc_promisc) {
                                if(!(virt[1] & GROUP_ADDR_BIT)) {
                                        if (virt[6] != MA[5] ||
                                            virt[5] != MA[4] ||
                                            virt[4] != MA[3] ||
                                            virt[3] != MA[2] ||
                                            virt[2] != MA[1] ||
                                            virt[1] != MA[0]) {
                                                DB_RX(2, "DA != MA and not multi- or broadcast");
                                                goto abort_frame ;
                                        }
                                }
                        }

                        /*
                         * LLC frame received
                         */
                        DB_RX(4, "LLC - receive");
                        mac_drv_rx_complete(smc,rxd,frag_count,len) ;
                }
                else {
                        if (!(mb = smt_get_mbuf(smc))) {
                                smc->hw.fp.err_stats.err_no_buf++ ;
                                DB_RX(4, "No SMbuf; receive terminated");
                                goto abort_frame ;
                        }
                        data = smtod(mb,char *) - 1 ;

                        /*
                         * copy the frame into a SMT_MBuf
                         */
#ifdef USE_OS_CPY
                        hwm_cpy_rxd2mb(rxd,data,len) ;
#else
                        for (r=rxd, i=used_frags ; i ; r=r->rxd_next, i--){
                                n = le32_to_cpu(r->rxd_rbctrl) & RD_LENGTH ;
                                DB_RX(6, "cp SMT frame to mb: len = %d", n);
                                memcpy(data,r->rxd_virt,n) ;
                                data += n ;
                        }
                        data = smtod(mb,char *) - 1 ;
#endif
                        fc = *(char *)mb->sm_data = *data ;
                        mb->sm_len = len - 1 ;          /* len - fc */
                        data++ ;

                        /*
                         * SMT frame received
                         */
                        switch(fc) {
                        case FC_SMT_INFO :
                                smc->hw.fp.err_stats.err_smt_frame++ ;
                                DB_RX(5, "SMT frame received");

                                if (smc->os.hwm.pass_SMT) {
                                        DB_RX(5, "pass SMT frame");
                                        mac_drv_rx_complete(smc, rxd,
                                                frag_count,len) ;
                                }
                                else {
                                        DB_RX(5, "requeue RxD");
                                        mac_drv_requeue_rxd(smc,rxd,frag_count);
                                }

                                smt_received_pack(smc,mb,(int)(rfsw>>25)) ;
                                break ;
                        case FC_SMT_NSA :
                                smc->hw.fp.err_stats.err_smt_frame++ ;
                                DB_RX(5, "SMT frame received");

                                /* if pass_NSA set pass the NSA frame or */
                                /* pass_SMT set and the A-Indicator */
                                /* is not set, pass the NSA frame */
                                if (smc->os.hwm.pass_NSA ||
                                        (smc->os.hwm.pass_SMT &&
                                        !(rfsw & A_INDIC))) {
                                        DB_RX(5, "pass SMT frame");
                                        mac_drv_rx_complete(smc, rxd,
                                                frag_count,len) ;
                                }
                                else {
                                        DB_RX(5, "requeue RxD");
                                        mac_drv_requeue_rxd(smc,rxd,frag_count);
                                }

                                smt_received_pack(smc,mb,(int)(rfsw>>25)) ;
                                break ;
                        case FC_BEACON :
                                if (smc->os.hwm.pass_DB) {
                                        DB_RX(5, "pass DB frame");
                                        mac_drv_rx_complete(smc, rxd,
                                                frag_count,len) ;
                                }
                                else {
                                        DB_RX(5, "requeue RxD");
                                        mac_drv_requeue_rxd(smc,rxd,frag_count);
                                }
                                smt_free_mbuf(smc,mb) ;
                                break ;
                        default :
                                /*
                                 * unknown FC abort the frame
                                 */
                                DB_RX(2, "unknown FC error");
                                smt_free_mbuf(smc,mb) ;
                                DB_RX(5, "requeue RxD");
                                mac_drv_requeue_rxd(smc,rxd,frag_count) ;
                                if ((fc & 0xf0) == FC_MAC)
                                        smc->hw.fp.err_stats.err_mac_frame++ ;
                                else
                                        smc->hw.fp.err_stats.err_imp_frame++ ;

                                break ;
                        }
                }

                DB_RX(3, "next RxD is %p", queue->rx_curr_get);
                NDD_TRACE("RHx1",queue->rx_curr_get,0,0) ;

                continue ;
        /*--------------------------------------------------------------------*/
abort_frame:
                DB_RX(5, "requeue RxD");
                mac_drv_requeue_rxd(smc,rxd,frag_count) ;

                DB_RX(3, "next RxD is %p", queue->rx_curr_get);
                NDD_TRACE("RHx2",queue->rx_curr_get,0,0) ;
        }
rx_end:
#ifdef  ALL_RX_COMPLETE
        mac_drv_all_receives_complete(smc) ;
#endif
        return ;        /* lint bug: needs return detect end of function */
}

static void smt_to_llc(struct s_smc *smc, SMbuf *mb)
{
        u_char  fc ;

        DB_RX(4, "send a queued frame to the llc layer");
        smc->os.hwm.r.len = mb->sm_len ;
        smc->os.hwm.r.mb_pos = smtod(mb,char *) ;
        fc = *smc->os.hwm.r.mb_pos ;
        (void)mac_drv_rx_init(smc,(int)mb->sm_len,(int)fc,
                smc->os.hwm.r.mb_pos,(int)mb->sm_len) ;
        smt_free_mbuf(smc,mb) ;
}

/*
 *      BEGIN_MANUAL_ENTRY(hwm_rx_frag)
 *      void hwm_rx_frag(smc,virt,phys,len,frame_status)
 *
 * function     MACRO           (hardware module, hwmtm.h)
 *              This function calls dma_master for preparing the
 *              system hardware for the DMA transfer and initializes
 *              the current RxD with the length and the physical and
 *              virtual address of the fragment. Furthermore, it sets the
 *              STF and EOF bits depending on the frame status byte,
 *              switches the OWN flag of the RxD, so that it is owned by the
 *              adapter and issues an rx_start.
 *
 * para virt    virtual pointer to the fragment
 *      len     the length of the fragment
 *      frame_status    status of the frame, see design description
 *
 * NOTE:        It is possible to call this function with a fragment length
 *              of zero.
 *
 *      END_MANUAL_ENTRY
 */
void hwm_rx_frag(struct s_smc *smc, char far *virt, u_long phys, int len,
                 int frame_status)
{
        struct s_smt_fp_rxd volatile *r ;
        __le32  rbctrl;

        NDD_TRACE("RHfB",virt,len,frame_status) ;
        DB_RX(2, "hwm_rx_frag: len = %d, frame_status = %x", len, frame_status);
        r = smc->hw.fp.rx_q[QUEUE_R1].rx_curr_put ;
        r->rxd_virt = virt ;
        r->rxd_rbadr = cpu_to_le32(phys) ;
        rbctrl = cpu_to_le32( (((__u32)frame_status &
                (FIRST_FRAG|LAST_FRAG))<<26) |
                (((u_long) frame_status & FIRST_FRAG) << 21) |
                BMU_OWN | BMU_CHECK | BMU_EN_IRQ_EOF | len) ;
        r->rxd_rbctrl = rbctrl ;

        DRV_BUF_FLUSH(r,DDI_DMA_SYNC_FORDEV) ;
        outpd(ADDR(B0_R1_CSR),CSR_START) ;
        smc->hw.fp.rx_q[QUEUE_R1].rx_free-- ;
        smc->hw.fp.rx_q[QUEUE_R1].rx_used++ ;
        smc->hw.fp.rx_q[QUEUE_R1].rx_curr_put = r->rxd_next ;
        NDD_TRACE("RHfE",r,le32_to_cpu(r->rxd_rbadr),0) ;
}

/*
 *      BEGINN_MANUAL_ENTRY(mac_drv_clear_rx_queue)
 *
 * void mac_drv_clear_rx_queue(smc)
 * struct s_smc *smc ;
 *
 * function     DOWNCALL        (hardware module, hwmtm.c)
 *              mac_drv_clear_rx_queue is called by the OS-specific module
 *              after it has issued a card_stop.
 *              In this case, the frames in the receive queue are obsolete and
 *              should be removed. For removing mac_drv_clear_rx_queue
 *              calls dma_master for each RxD and mac_drv_clear_rxd for each
 *              receive buffer.
 *
 * NOTE:        calling sequence card_stop:
 *              CLI_FBI(), card_stop(),
 *              mac_drv_clear_tx_queue(), mac_drv_clear_rx_queue(),
 *
 * NOTE:        The caller is responsible that the BMUs are idle
 *              when this function is called.
 *
 *      END_MANUAL_ENTRY
 */
void mac_drv_clear_rx_queue(struct s_smc *smc)
{
        struct s_smt_fp_rxd volatile *r ;
        struct s_smt_fp_rxd volatile *next_rxd ;
        struct s_smt_rx_queue *queue ;
        int frag_count ;
        int i ;

        if (smc->hw.hw_state != STOPPED) {
                SK_BREAK() ;
                SMT_PANIC(smc,HWM_E0012,HWM_E0012_MSG) ;
                return ;
        }

        queue = smc->hw.fp.rx[QUEUE_R1] ;
        DB_RX(5, "clear_rx_queue");

        /*
         * dma_complete and mac_drv_clear_rxd for all RxDs / receive buffers
         */
        r = queue->rx_curr_get ;
        while (queue->rx_used) {
                DRV_BUF_FLUSH(r,DDI_DMA_SYNC_FORCPU) ;
                DB_RX(5, "switch OWN bit of RxD 0x%p", r);
                r->rxd_rbctrl &= ~cpu_to_le32(BMU_OWN) ;
                frag_count = 1 ;
                DRV_BUF_FLUSH(r,DDI_DMA_SYNC_FORDEV) ;
                r = r->rxd_next ;
                DRV_BUF_FLUSH(r,DDI_DMA_SYNC_FORCPU) ;
                while (r != queue->rx_curr_put &&
                        !(r->rxd_rbctrl & cpu_to_le32(BMU_ST_BUF))) {
                        DB_RX(5, "Check STF bit in %p", r);
                        r->rxd_rbctrl &= ~cpu_to_le32(BMU_OWN) ;
                        DRV_BUF_FLUSH(r,DDI_DMA_SYNC_FORDEV) ;
                        r = r->rxd_next ;
                        DRV_BUF_FLUSH(r,DDI_DMA_SYNC_FORCPU) ;
                        frag_count++ ;
                }
                DB_RX(5, "STF bit found");
                next_rxd = r ;

                for (r=queue->rx_curr_get,i=frag_count; i ; r=r->rxd_next,i--){
                        DB_RX(5, "dma_complete for RxD %p", r);
                        dma_complete(smc,(union s_fp_descr volatile *)r,DMA_WR);
                }

                DB_RX(5, "mac_drv_clear_rxd: RxD %p frag_count %d",
                      queue->rx_curr_get, frag_count);
                mac_drv_clear_rxd(smc,queue->rx_curr_get,frag_count) ;

                queue->rx_curr_get = next_rxd ;
                queue->rx_used -= frag_count ;
                queue->rx_free += frag_count ;
        }
}


/*
        -------------------------------------------------------------
        SEND FUNCTIONS:
        -------------------------------------------------------------
*/

/*
 *      BEGIN_MANUAL_ENTRY(hwm_tx_init)
 *      int hwm_tx_init(smc,fc,frag_count,frame_len,frame_status)
 *
 * function     DOWN_CALL       (hardware module, hwmtm.c)
 *              hwm_tx_init checks if the frame can be sent through the
 *              corresponding send queue.
 *
 * para fc      the frame control. To determine through which
 *              send queue the frame should be transmitted.
 *              0x50 - 0x57:    asynchronous LLC frame
 *              0xD0 - 0xD7:    synchronous LLC frame
 *              0x41, 0x4F:     SMT frame to the network
 *              0x42:           SMT frame to the network and to the local SMT
 *              0x43:           SMT frame to the local SMT
 *      frag_count      count of the fragments for this frame
 *      frame_len       length of the frame
 *      frame_status    status of the frame, the send queue bit is already
 *                      specified
 *
 * return               frame_status
 *
 *      END_MANUAL_ENTRY
 */
int hwm_tx_init(struct s_smc *smc, u_char fc, int frag_count, int frame_len,
                int frame_status)
{
        NDD_TRACE("THiB",fc,frag_count,frame_len) ;
        smc->os.hwm.tx_p = smc->hw.fp.tx[frame_status & QUEUE_A0] ;
        smc->os.hwm.tx_descr = TX_DESCRIPTOR | (((u_long)(frame_len-1)&3)<<27) ;
        smc->os.hwm.tx_len = frame_len ;
        DB_TX(3, "hwm_tx_init: fc = %x, len = %d", fc, frame_len);
        if ((fc & ~(FC_SYNC_BIT|FC_LLC_PRIOR)) == FC_ASYNC_LLC) {
                frame_status |= LAN_TX ;
        }
        else {
                switch (fc) {
                case FC_SMT_INFO :
                case FC_SMT_NSA :
                        frame_status |= LAN_TX ;
                        break ;
                case FC_SMT_LOC :
                        frame_status |= LOC_TX ;
                        break ;
                case FC_SMT_LAN_LOC :
                        frame_status |= LAN_TX | LOC_TX ;
                        break ;
                default :
                        SMT_PANIC(smc,HWM_E0010,HWM_E0010_MSG) ;
                }
        }
        if (!smc->hw.mac_ring_is_up) {
                frame_status &= ~LAN_TX ;
                frame_status |= RING_DOWN ;
                DB_TX(2, "Ring is down: terminate LAN_TX");
        }
        if (frag_count > smc->os.hwm.tx_p->tx_free) {
#ifndef NDIS_OS2
                mac_drv_clear_txd(smc) ;
                if (frag_count > smc->os.hwm.tx_p->tx_free) {
                        DB_TX(2, "Out of TxDs, terminate LAN_TX");
                        frame_status &= ~LAN_TX ;
                        frame_status |= OUT_OF_TXD ;
                }
#else
                DB_TX(2, "Out of TxDs, terminate LAN_TX");
                frame_status &= ~LAN_TX ;
                frame_status |= OUT_OF_TXD ;
#endif
        }
        DB_TX(3, "frame_status = %x", frame_status);
        NDD_TRACE("THiE",frame_status,smc->os.hwm.tx_p->tx_free,0) ;
        return frame_status;
}

/*
 *      BEGIN_MANUAL_ENTRY(hwm_tx_frag)
 *      void hwm_tx_frag(smc,virt,phys,len,frame_status)
 *
 * function     DOWNCALL        (hardware module, hwmtm.c)
 *              If the frame should be sent to the LAN, this function calls
 *              dma_master, fills the current TxD with the virtual and the
 *              physical address, sets the STF and EOF bits dependent on
 *              the frame status, and requests the BMU to start the
 *              transmit.
 *              If the frame should be sent to the local SMT, an SMT_MBuf
 *              is allocated if the FIRST_FRAG bit is set in the frame_status.
 *              The fragment of the frame is copied into the SMT MBuf.
 *              The function smt_received_pack is called if the LAST_FRAG
 *              bit is set in the frame_status word.
 *
 * para virt    virtual pointer to the fragment
 *      len     the length of the fragment
 *      frame_status    status of the frame, see design description
 *
 * return       nothing returned, no parameter is modified
 *
 * NOTE:        It is possible to invoke this macro with a fragment length
 *              of zero.
 *
 *      END_MANUAL_ENTRY
 */
void hwm_tx_frag(struct s_smc *smc, char far *virt, u_long phys, int len,
                 int frame_status)
{
        struct s_smt_fp_txd volatile *t ;
        struct s_smt_tx_queue *queue ;
        __le32  tbctrl ;

        queue = smc->os.hwm.tx_p ;

        NDD_TRACE("THfB",virt,len,frame_status) ;
        /* Bug fix: AF / May 31 1999 (#missing)
         * snmpinfo problem reported by IBM is caused by invalid
         * t-pointer (txd) if LAN_TX is not set but LOC_TX only.
         * Set: t = queue->tx_curr_put  here !
         */
        t = queue->tx_curr_put ;

        DB_TX(2, "hwm_tx_frag: len = %d, frame_status = %x", len, frame_status);
        if (frame_status & LAN_TX) {
                /* '*t' is already defined */
                DB_TX(3, "LAN_TX: TxD = %p, virt = %p", t, virt);
                t->txd_virt = virt ;
                t->txd_txdscr = cpu_to_le32(smc->os.hwm.tx_descr) ;
                t->txd_tbadr = cpu_to_le32(phys) ;
                tbctrl = cpu_to_le32((((__u32)frame_status &
                        (FIRST_FRAG|LAST_FRAG|EN_IRQ_EOF))<< 26) |
                        BMU_OWN|BMU_CHECK |len) ;
                t->txd_tbctrl = tbctrl ;

#ifndef AIX
                DRV_BUF_FLUSH(t,DDI_DMA_SYNC_FORDEV) ;
                outpd(queue->tx_bmu_ctl,CSR_START) ;
#else   /* ifndef AIX */
                DRV_BUF_FLUSH(t,DDI_DMA_SYNC_FORDEV) ;
                if (frame_status & QUEUE_A0) {
                        outpd(ADDR(B0_XA_CSR),CSR_START) ;
                }
                else {
                        outpd(ADDR(B0_XS_CSR),CSR_START) ;
                }
#endif
                queue->tx_free-- ;
                queue->tx_used++ ;
                queue->tx_curr_put = t->txd_next ;
                if (frame_status & LAST_FRAG) {
                        smc->mib.m[MAC0].fddiMACTransmit_Ct++ ;
                }
        }
        if (frame_status & LOC_TX) {
                DB_TX(3, "LOC_TX:");
                if (frame_status & FIRST_FRAG) {
                        if(!(smc->os.hwm.tx_mb = smt_get_mbuf(smc))) {
                                smc->hw.fp.err_stats.err_no_buf++ ;
                                DB_TX(4, "No SMbuf; transmit terminated");
                        }
                        else {
                                smc->os.hwm.tx_data =
                                        smtod(smc->os.hwm.tx_mb,char *) - 1 ;
#ifdef USE_OS_CPY
#ifdef PASS_1ST_TXD_2_TX_COMP
                                hwm_cpy_txd2mb(t,smc->os.hwm.tx_data,
                                        smc->os.hwm.tx_len) ;
#endif
#endif
                        }
                }
                if (smc->os.hwm.tx_mb) {
#ifndef USE_OS_CPY
                        DB_TX(3, "copy fragment into MBuf");
                        memcpy(smc->os.hwm.tx_data,virt,len) ;
                        smc->os.hwm.tx_data += len ;
#endif
                        if (frame_status & LAST_FRAG) {
#ifdef  USE_OS_CPY
#ifndef PASS_1ST_TXD_2_TX_COMP
                                /*
                                 * hwm_cpy_txd2mb(txd,data,len) copies 'len' 
                                 * bytes from the virtual pointer in 'rxd'
                                 * to 'data'. The virtual pointer of the 
                                 * os-specific tx-buffer should be written
                                 * in the LAST txd.
                                 */ 
                                hwm_cpy_txd2mb(t,smc->os.hwm.tx_data,
                                        smc->os.hwm.tx_len) ;
#endif  /* nPASS_1ST_TXD_2_TX_COMP */
#endif  /* USE_OS_CPY */
                                smc->os.hwm.tx_data =
                                        smtod(smc->os.hwm.tx_mb,char *) - 1 ;
                                *(char *)smc->os.hwm.tx_mb->sm_data =
                                        *smc->os.hwm.tx_data ;
                                smc->os.hwm.tx_data++ ;
                                smc->os.hwm.tx_mb->sm_len =
                                        smc->os.hwm.tx_len - 1 ;
                                DB_TX(3, "pass LLC frame to SMT");
                                smt_received_pack(smc,smc->os.hwm.tx_mb,
                                                RD_FS_LOCAL) ;
                        }
                }
        }
        NDD_TRACE("THfE",t,queue->tx_free,0) ;
}


/*
 * queues a receive for later send
 */
static void queue_llc_rx(struct s_smc *smc, SMbuf *mb)
{
        DB_GEN(4, "queue_llc_rx: mb = %p", mb);
        smc->os.hwm.queued_rx_frames++ ;
        mb->sm_next = (SMbuf *)NULL ;
        if (smc->os.hwm.llc_rx_pipe == NULL) {
                smc->os.hwm.llc_rx_pipe = mb ;
        }
        else {
                smc->os.hwm.llc_rx_tail->sm_next = mb ;
        }
        smc->os.hwm.llc_rx_tail = mb ;

        /*
         * force an timer IRQ to receive the data
         */
        if (!smc->os.hwm.isr_flag) {
                smt_force_irq(smc) ;
        }
}

/*
 * get a SMbuf from the llc_rx_queue
 */
static SMbuf *get_llc_rx(struct s_smc *smc)
{
        SMbuf   *mb ;

        if ((mb = smc->os.hwm.llc_rx_pipe)) {
                smc->os.hwm.queued_rx_frames-- ;
                smc->os.hwm.llc_rx_pipe = mb->sm_next ;
        }
        DB_GEN(4, "get_llc_rx: mb = 0x%p", mb);
        return mb;
}

/*
 * queues a transmit SMT MBuf during the time were the MBuf is
 * queued the TxD ring
 */
static void queue_txd_mb(struct s_smc *smc, SMbuf *mb)
{
        DB_GEN(4, "_rx: queue_txd_mb = %p", mb);
        smc->os.hwm.queued_txd_mb++ ;
        mb->sm_next = (SMbuf *)NULL ;
        if (smc->os.hwm.txd_tx_pipe == NULL) {
                smc->os.hwm.txd_tx_pipe = mb ;
        }
        else {
                smc->os.hwm.txd_tx_tail->sm_next = mb ;
        }
        smc->os.hwm.txd_tx_tail = mb ;
}

/*
 * get a SMbuf from the txd_tx_queue
 */
static SMbuf *get_txd_mb(struct s_smc *smc)
{
        SMbuf *mb ;

        if ((mb = smc->os.hwm.txd_tx_pipe)) {
                smc->os.hwm.queued_txd_mb-- ;
                smc->os.hwm.txd_tx_pipe = mb->sm_next ;
        }
        DB_GEN(4, "get_txd_mb: mb = 0x%p", mb);
        return mb;
}

/*
 *      SMT Send function
 */
void smt_send_mbuf(struct s_smc *smc, SMbuf *mb, int fc)
{
        char far *data ;
        int     len ;
        int     n ;
        int     i ;
        int     frag_count ;
        int     frame_status ;
        SK_LOC_DECL(char far,*virt[3]) ;
        int     frag_len[3] ;
        struct s_smt_tx_queue *queue ;
        struct s_smt_fp_txd volatile *t ;
        u_long  phys ;
        __le32  tbctrl;

        NDD_TRACE("THSB",mb,fc,0) ;
        DB_TX(4, "smt_send_mbuf: mb = 0x%p, fc = 0x%x", mb, fc);

        mb->sm_off-- ;  /* set to fc */
        mb->sm_len++ ;  /* + fc */
        data = smtod(mb,char *) ;
        *data = fc ;
        if (fc == FC_SMT_LOC)
                *data = FC_SMT_INFO ;

        /*
         * determine the frag count and the virt addresses of the frags
         */
        frag_count = 0 ;
        len = mb->sm_len ;
        while (len) {
                n = SMT_PAGESIZE - ((long)data & (SMT_PAGESIZE-1)) ;
                if (n >= len) {
                        n = len ;
                }
                DB_TX(5, "frag: virt/len = 0x%p/%d", data, n);
                virt[frag_count] = data ;
                frag_len[frag_count] = n ;
                frag_count++ ;
                len -= n ;
                data += n ;
        }

        /*
         * determine the frame status
         */
        queue = smc->hw.fp.tx[QUEUE_A0] ;
        if (fc == FC_BEACON || fc == FC_SMT_LOC) {
                frame_status = LOC_TX ;
        }
        else {
                frame_status = LAN_TX ;
                if ((smc->os.hwm.pass_NSA &&(fc == FC_SMT_NSA)) ||
                   (smc->os.hwm.pass_SMT &&(fc == FC_SMT_INFO)))
                        frame_status |= LOC_TX ;
        }

        if (!smc->hw.mac_ring_is_up || frag_count > queue->tx_free) {
                frame_status &= ~LAN_TX;
                if (frame_status) {
                        DB_TX(2, "Ring is down: terminate LAN_TX");
                }
                else {
                        DB_TX(2, "Ring is down: terminate transmission");
                        smt_free_mbuf(smc,mb) ;
                        return ;
                }
        }
        DB_TX(5, "frame_status = 0x%x", frame_status);

        if ((frame_status & LAN_TX) && (frame_status & LOC_TX)) {
                mb->sm_use_count = 2 ;
        }

        if (frame_status & LAN_TX) {
                t = queue->tx_curr_put ;
                frame_status |= FIRST_FRAG ;
                for (i = 0; i < frag_count; i++) {
                        DB_TX(5, "init TxD = 0x%p", t);
                        if (i == frag_count-1) {
                                frame_status |= LAST_FRAG ;
                                t->txd_txdscr = cpu_to_le32(TX_DESCRIPTOR |
                                        (((__u32)(mb->sm_len-1)&3) << 27)) ;
                        }
                        t->txd_virt = virt[i] ;
                        phys = dma_master(smc, (void far *)virt[i],
                                frag_len[i], DMA_RD|SMT_BUF) ;
                        t->txd_tbadr = cpu_to_le32(phys) ;
                        tbctrl = cpu_to_le32((((__u32)frame_status &
                                (FIRST_FRAG|LAST_FRAG)) << 26) |
                                BMU_OWN | BMU_CHECK | BMU_SMT_TX |frag_len[i]) ;
                        t->txd_tbctrl = tbctrl ;
#ifndef AIX
                        DRV_BUF_FLUSH(t,DDI_DMA_SYNC_FORDEV) ;
                        outpd(queue->tx_bmu_ctl,CSR_START) ;
#else
                        DRV_BUF_FLUSH(t,DDI_DMA_SYNC_FORDEV) ;
                        outpd(ADDR(B0_XA_CSR),CSR_START) ;
#endif
                        frame_status &= ~FIRST_FRAG ;
                        queue->tx_curr_put = t = t->txd_next ;
                        queue->tx_free-- ;
                        queue->tx_used++ ;
                }
                smc->mib.m[MAC0].fddiMACTransmit_Ct++ ;
                queue_txd_mb(smc,mb) ;
        }

        if (frame_status & LOC_TX) {
                DB_TX(5, "pass Mbuf to LLC queue");
                queue_llc_rx(smc,mb) ;
        }

        /*
         * We need to unqueue the free SMT_MBUFs here, because it may
         * be that the SMT want's to send more than 1 frame for one down call
         */
        mac_drv_clear_txd(smc) ;
        NDD_TRACE("THSE",t,queue->tx_free,frag_count) ;
}

/*      BEGIN_MANUAL_ENTRY(mac_drv_clear_txd)
 *      void mac_drv_clear_txd(smc)
 *
 * function     DOWNCALL        (hardware module, hwmtm.c)
 *              mac_drv_clear_txd searches in both send queues for TxD's
 *              which were finished by the adapter. It calls dma_complete
 *              for each TxD. If the last fragment of an LLC frame is
 *              reached, it calls mac_drv_tx_complete to release the
 *              send buffer.
 *
 * return       nothing
 *
 *      END_MANUAL_ENTRY
 */
static void mac_drv_clear_txd(struct s_smc *smc)
{
        struct s_smt_tx_queue *queue ;
        struct s_smt_fp_txd volatile *t1 ;
        struct s_smt_fp_txd volatile *t2 = NULL ;
        SMbuf *mb ;
        u_long  tbctrl ;
        int i ;
        int frag_count ;
        int n ;

        NDD_TRACE("THcB",0,0,0) ;
        for (i = QUEUE_S; i <= QUEUE_A0; i++) {
                queue = smc->hw.fp.tx[i] ;
                t1 = queue->tx_curr_get ;
                DB_TX(5, "clear_txd: QUEUE = %d (0=sync/1=async)", i);

                for ( ; ; ) {
                        frag_count = 0 ;

                        do {
                                DRV_BUF_FLUSH(t1,DDI_DMA_SYNC_FORCPU) ;
                                DB_TX(5, "check OWN/EOF bit of TxD 0x%p", t1);
                                tbctrl = le32_to_cpu(CR_READ(t1->txd_tbctrl));

                                if (tbctrl & BMU_OWN || !queue->tx_used){
                                        DB_TX(4, "End of TxDs queue %d", i);
                                        goto free_next_queue ;  /* next queue */
                                }
                                t1 = t1->txd_next ;
                                frag_count++ ;
                        } while (!(tbctrl & BMU_EOF)) ;

                        t1 = queue->tx_curr_get ;
                        for (n = frag_count; n; n--) {
                                tbctrl = le32_to_cpu(t1->txd_tbctrl) ;
                                dma_complete(smc,
                                        (union s_fp_descr volatile *) t1,
                                        (int) (DMA_RD |
                                        ((tbctrl & BMU_SMT_TX) >> 18))) ;
                                t2 = t1 ;
                                t1 = t1->txd_next ;
                        }

                        if (tbctrl & BMU_SMT_TX) {
                                mb = get_txd_mb(smc) ;
                                smt_free_mbuf(smc,mb) ;
                        }
                        else {
#ifndef PASS_1ST_TXD_2_TX_COMP
                                DB_TX(4, "mac_drv_tx_comp for TxD 0x%p", t2);
                                mac_drv_tx_complete(smc,t2) ;
#else
                                DB_TX(4, "mac_drv_tx_comp for TxD 0x%x",
                                      queue->tx_curr_get);
                                mac_drv_tx_complete(smc,queue->tx_curr_get) ;
#endif
                        }
                        queue->tx_curr_get = t1 ;
                        queue->tx_free += frag_count ;
                        queue->tx_used -= frag_count ;
                }
free_next_queue: ;
        }

        NDD_TRACE("THcE",0,0,0) ;
}

/*
 *      BEGINN_MANUAL_ENTRY(mac_drv_clear_tx_queue)
 *
 * void mac_drv_clear_tx_queue(smc)
 * struct s_smc *smc ;
 *
 * function     DOWNCALL        (hardware module, hwmtm.c)
 *              mac_drv_clear_tx_queue is called from the SMT when
 *              the RMT state machine has entered the ISOLATE state.
 *              This function is also called by the os-specific module
 *              after it has called the function card_stop().
 *              In this case, the frames in the send queues are obsolete and
 *              should be removed.
 *
 * note         calling sequence:
 *              CLI_FBI(), card_stop(),
 *              mac_drv_clear_tx_queue(), mac_drv_clear_rx_queue(),
 *
 * NOTE:        The caller is responsible that the BMUs are idle
 *              when this function is called.
 *
 *      END_MANUAL_ENTRY
 */
void mac_drv_clear_tx_queue(struct s_smc *smc)
{
        struct s_smt_fp_txd volatile *t ;
        struct s_smt_tx_queue *queue ;
        int tx_used ;
        int i ;

        if (smc->hw.hw_state != STOPPED) {
                SK_BREAK() ;
                SMT_PANIC(smc,HWM_E0011,HWM_E0011_MSG) ;
                return ;
        }

        for (i = QUEUE_S; i <= QUEUE_A0; i++) {
                queue = smc->hw.fp.tx[i] ;
                DB_TX(5, "clear_tx_queue: QUEUE = %d (0=sync/1=async)", i);

                /*
                 * switch the OWN bit of all pending frames to the host
                 */
                t = queue->tx_curr_get ;
                tx_used = queue->tx_used ;
                while (tx_used) {
                        DRV_BUF_FLUSH(t,DDI_DMA_SYNC_FORCPU) ;
                        DB_TX(5, "switch OWN bit of TxD 0x%p", t);
                        t->txd_tbctrl &= ~cpu_to_le32(BMU_OWN) ;
                        DRV_BUF_FLUSH(t,DDI_DMA_SYNC_FORDEV) ;
                        t = t->txd_next ;
                        tx_used-- ;
                }
        }

        /*
         * release all TxD's for both send queues
         */
        mac_drv_clear_txd(smc) ;

        for (i = QUEUE_S; i <= QUEUE_A0; i++) {
                queue = smc->hw.fp.tx[i] ;
                t = queue->tx_curr_get ;

                /*
                 * write the phys pointer of the NEXT descriptor into the
                 * BMU's current address descriptor pointer and set
                 * tx_curr_get and tx_curr_put to this position
                 */
                if (i == QUEUE_S) {
                        outpd(ADDR(B5_XS_DA),le32_to_cpu(t->txd_ntdadr)) ;
                }
                else {
                        outpd(ADDR(B5_XA_DA),le32_to_cpu(t->txd_ntdadr)) ;
                }

                queue->tx_curr_put = queue->tx_curr_get->txd_next ;
                queue->tx_curr_get = queue->tx_curr_put ;
        }
}


/*
        -------------------------------------------------------------
        TEST FUNCTIONS:
        -------------------------------------------------------------
*/

#ifdef  DEBUG
/*
 *      BEGIN_MANUAL_ENTRY(mac_drv_debug_lev)
 *      void mac_drv_debug_lev(smc,flag,lev)
 *
 * function     DOWNCALL        (drvsr.c)
 *              To get a special debug info the user can assign a debug level
 *              to any debug flag.
 *
 * para flag    debug flag, possible values are:
 *                      = 0:    reset all debug flags (the defined level is
 *                              ignored)
 *                      = 1:    debug.d_smtf
 *                      = 2:    debug.d_smt
 *                      = 3:    debug.d_ecm
 *                      = 4:    debug.d_rmt
 *                      = 5:    debug.d_cfm
 *                      = 6:    debug.d_pcm
 *
 *                      = 10:   debug.d_os.hwm_rx (hardware module receive path)
 *                      = 11:   debug.d_os.hwm_tx(hardware module transmit path)
 *                      = 12:   debug.d_os.hwm_gen(hardware module general flag)
 *
 *      lev     debug level
 *
 *      END_MANUAL_ENTRY
 */
void mac_drv_debug_lev(struct s_smc *smc, int flag, int lev)
{
        switch(flag) {
        case (int)NULL:
                DB_P.d_smtf = DB_P.d_smt = DB_P.d_ecm = DB_P.d_rmt = 0 ;
                DB_P.d_cfm = 0 ;
                DB_P.d_os.hwm_rx = DB_P.d_os.hwm_tx = DB_P.d_os.hwm_gen = 0 ;
#ifdef  SBA
                DB_P.d_sba = 0 ;
#endif
#ifdef  ESS
                DB_P.d_ess = 0 ;
#endif
                break ;
        case DEBUG_SMTF:
                DB_P.d_smtf = lev ;
                break ;
        case DEBUG_SMT:
                DB_P.d_smt = lev ;
                break ;
        case DEBUG_ECM:
                DB_P.d_ecm = lev ;
                break ;
        case DEBUG_RMT:
                DB_P.d_rmt = lev ;
                break ;
        case DEBUG_CFM:
                DB_P.d_cfm = lev ;
                break ;
        case DEBUG_PCM:
                DB_P.d_pcm = lev ;
                break ;
        case DEBUG_SBA:
#ifdef  SBA
                DB_P.d_sba = lev ;
#endif
                break ;
        case DEBUG_ESS:
#ifdef  ESS
                DB_P.d_ess = lev ;
#endif
                break ;
        case DB_HWM_RX:
                DB_P.d_os.hwm_rx = lev ;
                break ;
        case DB_HWM_TX:
                DB_P.d_os.hwm_tx = lev ;
                break ;
        case DB_HWM_GEN:
                DB_P.d_os.hwm_gen = lev ;
                break ;
        default:
                break ;
        }
}
#endif