// 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.
 *
 ******************************************************************************/

/*
        PCM
        Physical Connection Management
*/

/*
 * Hardware independent state machine implemantation
 * The following external SMT functions are referenced :
 *
 *              queue_event()
 *              smt_timer_start()
 *              smt_timer_stop()
 *
 *      The following external HW dependent functions are referenced :
 *              sm_pm_control()
 *              sm_ph_linestate()
 *
 *      The following HW dependent events are required :
 *              PC_QLS
 *              PC_ILS
 *              PC_HLS
 *              PC_MLS
 *              PC_NSE
 *              PC_LEM
 *
 */


#include "h/types.h"
#include "h/fddi.h"
#include "h/smc.h"
#include "h/supern_2.h"
#define KERNEL
#include "h/smtstate.h"

#ifdef  FDDI_MIB
extern int snmp_fddi_trap(
#ifdef  ANSIC
struct s_smc    * smc, int  type, int  index
#endif
);
#endif
#ifdef  CONCENTRATOR
extern int plc_is_installed(
#ifdef  ANSIC
struct s_smc *smc ,
int p
#endif
) ;
#endif
/*
 * FSM Macros
 */
#define AFLAG           (0x20)
#define GO_STATE(x)     (mib->fddiPORTPCMState = (x)|AFLAG)
#define ACTIONS_DONE()  (mib->fddiPORTPCMState &= ~AFLAG)
#define ACTIONS(x)      (x|AFLAG)

/*
 * PCM states
 */
#define PC0_OFF                 0
#define PC1_BREAK               1
#define PC2_TRACE               2
#define PC3_CONNECT             3
#define PC4_NEXT                4
#define PC5_SIGNAL              5
#define PC6_JOIN                6
#define PC7_VERIFY              7
#define PC8_ACTIVE              8
#define PC9_MAINT               9

/*
 * symbolic state names
 */
static const char * const pcm_states[] =  {
        "PC0_OFF","PC1_BREAK","PC2_TRACE","PC3_CONNECT","PC4_NEXT",
        "PC5_SIGNAL","PC6_JOIN","PC7_VERIFY","PC8_ACTIVE","PC9_MAINT"
} ;

/*
 * symbolic event names
 */
static const char * const pcm_events[] = {
        "NONE","PC_START","PC_STOP","PC_LOOP","PC_JOIN","PC_SIGNAL",
        "PC_REJECT","PC_MAINT","PC_TRACE","PC_PDR",
        "PC_ENABLE","PC_DISABLE",
        "PC_QLS","PC_ILS","PC_MLS","PC_HLS","PC_LS_PDR","PC_LS_NONE",
        "PC_TIMEOUT_TB_MAX","PC_TIMEOUT_TB_MIN",
        "PC_TIMEOUT_C_MIN","PC_TIMEOUT_T_OUT",
        "PC_TIMEOUT_TL_MIN","PC_TIMEOUT_T_NEXT","PC_TIMEOUT_LCT",
        "PC_NSE","PC_LEM"
} ;

#ifdef  MOT_ELM
/*
 * PCL-S control register
 * this register in the PLC-S controls the scrambling parameters
 */
#define PLCS_CONTROL_C_U        0
#define PLCS_CONTROL_C_S        (PL_C_SDOFF_ENABLE | PL_C_SDON_ENABLE | \
                                 PL_C_CIPHER_ENABLE)
#define PLCS_FASSERT_U          0
#define PLCS_FASSERT_S          0xFd76  /* 52.0 us */
#define PLCS_FDEASSERT_U        0
#define PLCS_FDEASSERT_S        0
#else   /* nMOT_ELM */
/*
 * PCL-S control register
 * this register in the PLC-S controls the scrambling parameters
 * can be patched for ANSI compliance if standard changes
 */
static const u_char plcs_control_c_u[17] = "PLC_CNTRL_C_U=\0\0" ;
static const u_char plcs_control_c_s[17] = "PLC_CNTRL_C_S=\01\02" ;

#define PLCS_CONTROL_C_U (plcs_control_c_u[14] | (plcs_control_c_u[15]<<8))
#define PLCS_CONTROL_C_S (plcs_control_c_s[14] | (plcs_control_c_s[15]<<8))
#endif  /* nMOT_ELM */

/*
 * external vars
 */
/* struct definition see 'cmtdef.h' (also used by CFM) */

#define PS_OFF          0
#define PS_BIT3         1
#define PS_BIT4         2
#define PS_BIT7         3
#define PS_LCT          4
#define PS_BIT8         5
#define PS_JOIN         6
#define PS_ACTIVE       7

#define LCT_LEM_MAX     255

/*
 * PLC timing parameter
 */

#define PLC_MS(m)       ((int)((0x10000L-(m*100000L/2048))))
#define SLOW_TL_MIN     PLC_MS(6)
#define SLOW_C_MIN      PLC_MS(10)

static  const struct plt {
        int     timer ;                 /* relative plc timer address */
        int     para ;                  /* default timing parameters */
} pltm[] = {
        { PL_C_MIN, SLOW_C_MIN },       /* min t. to remain Connect State */
        { PL_TL_MIN, SLOW_TL_MIN },     /* min t. to transmit a Line State */
        { PL_TB_MIN, TP_TB_MIN },       /* min break time */
        { PL_T_OUT, TP_T_OUT },         /* Signaling timeout */
        { PL_LC_LENGTH, TP_LC_LENGTH }, /* Link Confidence Test Time */
        { PL_T_SCRUB, TP_T_SCRUB },     /* Scrub Time == MAC TVX time ! */
        { PL_NS_MAX, TP_NS_MAX },       /* max t. that noise is tolerated */
        { 0,0 }
} ;

/*
 * interrupt mask
 */
#ifdef  SUPERNET_3
/*
 * Do we need the EBUF error during signaling, too, to detect SUPERNET_3
 * PLL bug?
 */
static const int plc_imsk_na = PL_PCM_CODE | PL_TRACE_PROP | PL_PCM_BREAK |
                        PL_PCM_ENABLED | PL_SELF_TEST | PL_EBUF_ERR;
#else   /* SUPERNET_3 */
/*
 * We do NOT need the elasticity buffer error during signaling.
 */
static int plc_imsk_na = PL_PCM_CODE | PL_TRACE_PROP | PL_PCM_BREAK |
                        PL_PCM_ENABLED | PL_SELF_TEST ;
#endif  /* SUPERNET_3 */
static const int plc_imsk_act = PL_PCM_CODE | PL_TRACE_PROP | PL_PCM_BREAK |
                        PL_PCM_ENABLED | PL_SELF_TEST | PL_EBUF_ERR;

/* internal functions */
static void pcm_fsm(struct s_smc *smc, struct s_phy *phy, int cmd);
static void pc_rcode_actions(struct s_smc *smc, int bit, struct s_phy *phy);
static void pc_tcode_actions(struct s_smc *smc, const int bit, struct s_phy *phy);
static void reset_lem_struct(struct s_phy *phy);
static void plc_init(struct s_smc *smc, int p);
static void sm_ph_lem_start(struct s_smc *smc, int np, int threshold);
static void sm_ph_lem_stop(struct s_smc *smc, int np);
static void sm_ph_linestate(struct s_smc *smc, int phy, int ls);
static void real_init_plc(struct s_smc *smc);

/*
 * SMT timer interface
 *      start PCM timer 0
 */
static void start_pcm_timer0(struct s_smc *smc, u_long value, int event,
                             struct s_phy *phy)
{
        phy->timer0_exp = FALSE ;       /* clear timer event flag */
        smt_timer_start(smc,&phy->pcm_timer0,value,
                EV_TOKEN(EVENT_PCM+phy->np,event)) ;
}
/*
 * SMT timer interface
 *      stop PCM timer 0
 */
static void stop_pcm_timer0(struct s_smc *smc, struct s_phy *phy)
{
        if (phy->pcm_timer0.tm_active)
                smt_timer_stop(smc,&phy->pcm_timer0) ;
}

/*
        init PCM state machine (called by driver)
        clear all PCM vars and flags
*/
void pcm_init(struct s_smc *smc)
{
        int             i ;
        int             np ;
        struct s_phy    *phy ;
        struct fddi_mib_p       *mib ;

        for (np = 0,phy = smc->y ; np < NUMPHYS ; np++,phy++) {
                /* Indicates the type of PHY being used */
                mib = phy->mib ;
                mib->fddiPORTPCMState = ACTIONS(PC0_OFF) ;
                phy->np = np ;
                switch (smc->s.sas) {
#ifdef  CONCENTRATOR
                case SMT_SAS :
                        mib->fddiPORTMy_Type = (np == PS) ? TS : TM ;
                        break ;
                case SMT_DAS :
                        mib->fddiPORTMy_Type = (np == PA) ? TA :
                                        (np == PB) ? TB : TM ;
                        break ;
                case SMT_NAC :
                        mib->fddiPORTMy_Type = TM ;
                        break;
#else
                case SMT_SAS :
                        mib->fddiPORTMy_Type = (np == PS) ? TS : TNONE ;
                        mib->fddiPORTHardwarePresent = (np == PS) ? TRUE :
                                        FALSE ;
#ifndef SUPERNET_3
                        smc->y[PA].mib->fddiPORTPCMState = PC0_OFF ;
#else
                        smc->y[PB].mib->fddiPORTPCMState = PC0_OFF ;
#endif
                        break ;
                case SMT_DAS :
                        mib->fddiPORTMy_Type = (np == PB) ? TB : TA ;
                        break ;
#endif
                }
                /*
                 * set PMD-type
                 */
                phy->pmd_scramble = 0 ;
                switch (phy->pmd_type[PMD_SK_PMD]) {
                case 'P' :
                        mib->fddiPORTPMDClass = MIB_PMDCLASS_MULTI ;
                        break ;
                case 'L' :
                        mib->fddiPORTPMDClass = MIB_PMDCLASS_LCF ;
                        break ;
                case 'D' :
                        mib->fddiPORTPMDClass = MIB_PMDCLASS_TP ;
                        break ;
                case 'S' :
                        mib->fddiPORTPMDClass = MIB_PMDCLASS_TP ;
                        phy->pmd_scramble = TRUE ;
                        break ;
                case 'U' :
                        mib->fddiPORTPMDClass = MIB_PMDCLASS_TP ;
                        phy->pmd_scramble = TRUE ;
                        break ;
                case '1' :
                        mib->fddiPORTPMDClass = MIB_PMDCLASS_SINGLE1 ;
                        break ;
                case '2' :
                        mib->fddiPORTPMDClass = MIB_PMDCLASS_SINGLE2 ;
                        break ;
                case '3' :
                        mib->fddiPORTPMDClass = MIB_PMDCLASS_SINGLE2 ;
                        break ;
                case '4' :
                        mib->fddiPORTPMDClass = MIB_PMDCLASS_SINGLE1 ;
                        break ;
                case 'H' :
                        mib->fddiPORTPMDClass = MIB_PMDCLASS_UNKNOWN ;
                        break ;
                case 'I' :
                        mib->fddiPORTPMDClass = MIB_PMDCLASS_TP ;
                        break ;
                case 'G' :
                        mib->fddiPORTPMDClass = MIB_PMDCLASS_TP ;
                        break ;
                default:
                        mib->fddiPORTPMDClass = MIB_PMDCLASS_UNKNOWN ;
                        break ;
                }
                /*
                 * A and B port can be on primary and secondary path
                 */
                switch (mib->fddiPORTMy_Type) {
                case TA :
                        mib->fddiPORTAvailablePaths |= MIB_PATH_S ;
                        mib->fddiPORTRequestedPaths[1] = MIB_P_PATH_LOCAL ;
                        mib->fddiPORTRequestedPaths[2] =
                                MIB_P_PATH_LOCAL |
                                MIB_P_PATH_CON_ALTER |
                                MIB_P_PATH_SEC_PREFER ;
                        mib->fddiPORTRequestedPaths[3] =
                                MIB_P_PATH_LOCAL |
                                MIB_P_PATH_CON_ALTER |
                                MIB_P_PATH_SEC_PREFER |
                                MIB_P_PATH_THRU ;
                        break ;
                case TB :
                        mib->fddiPORTAvailablePaths |= MIB_PATH_S ;
                        mib->fddiPORTRequestedPaths[1] = MIB_P_PATH_LOCAL ;
                        mib->fddiPORTRequestedPaths[2] =
                                MIB_P_PATH_LOCAL |
                                MIB_P_PATH_PRIM_PREFER ;
                        mib->fddiPORTRequestedPaths[3] =
                                MIB_P_PATH_LOCAL |
                                MIB_P_PATH_PRIM_PREFER |
                                MIB_P_PATH_CON_PREFER |
                                MIB_P_PATH_THRU ;
                        break ;
                case TS :
                        mib->fddiPORTAvailablePaths |= MIB_PATH_S ;
                        mib->fddiPORTRequestedPaths[1] = MIB_P_PATH_LOCAL ;
                        mib->fddiPORTRequestedPaths[2] =
                                MIB_P_PATH_LOCAL |
                                MIB_P_PATH_CON_ALTER |
                                MIB_P_PATH_PRIM_PREFER ;
                        mib->fddiPORTRequestedPaths[3] =
                                MIB_P_PATH_LOCAL |
                                MIB_P_PATH_CON_ALTER |
                                MIB_P_PATH_PRIM_PREFER ;
                        break ;
                case TM :
                        mib->fddiPORTRequestedPaths[1] = MIB_P_PATH_LOCAL ;
                        mib->fddiPORTRequestedPaths[2] =
                                MIB_P_PATH_LOCAL |
                                MIB_P_PATH_SEC_ALTER |
                                MIB_P_PATH_PRIM_ALTER ;
                        mib->fddiPORTRequestedPaths[3] = 0 ;
                        break ;
                }

                phy->pc_lem_fail = FALSE ;
                mib->fddiPORTPCMStateX = mib->fddiPORTPCMState ;
                mib->fddiPORTLCTFail_Ct = 0 ;
                mib->fddiPORTBS_Flag = 0 ;
                mib->fddiPORTCurrentPath = MIB_PATH_ISOLATED ;
                mib->fddiPORTNeighborType = TNONE ;
                phy->ls_flag = 0 ;
                phy->rc_flag = 0 ;
                phy->tc_flag = 0 ;
                phy->td_flag = 0 ;
                if (np >= PM)
                        phy->phy_name = '0' + np - PM ;
                else
                        phy->phy_name = 'A' + np ;
                phy->wc_flag = FALSE ;          /* set by SMT */
                memset((char *)&phy->lem,0,sizeof(struct lem_counter)) ;
                reset_lem_struct(phy) ;
                memset((char *)&phy->plc,0,sizeof(struct s_plc)) ;
                phy->plc.p_state = PS_OFF ;
                for (i = 0 ; i < NUMBITS ; i++) {
                        phy->t_next[i] = 0 ;
                }
        }
        real_init_plc(smc) ;
}

void init_plc(struct s_smc *smc)
{
        SK_UNUSED(smc) ;

        /*
         * dummy
         * this is an obsolete public entry point that has to remain
         * for compat. It is used by various drivers.
         * the work is now done in real_init_plc()
         * which is called from pcm_init() ;
         */
}

static void real_init_plc(struct s_smc *smc)
{
        int     p ;

        for (p = 0 ; p < NUMPHYS ; p++)
                plc_init(smc,p) ;
}

static void plc_init(struct s_smc *smc, int p)
{
        int     i ;
#ifndef MOT_ELM
        int     rev ;   /* Revision of PLC-x */
#endif  /* MOT_ELM */

        /* transit PCM state machine to MAINT state */
        outpw(PLC(p,PL_CNTRL_B),0) ;
        outpw(PLC(p,PL_CNTRL_B),PL_PCM_STOP) ;
        outpw(PLC(p,PL_CNTRL_A),0) ;

        /*
         * if PLC-S then set control register C
         */
#ifndef MOT_ELM
        rev = inpw(PLC(p,PL_STATUS_A)) & PLC_REV_MASK ;
        if (rev != PLC_REVISION_A)
#endif  /* MOT_ELM */
        {
                if (smc->y[p].pmd_scramble) {
                        outpw(PLC(p,PL_CNTRL_C),PLCS_CONTROL_C_S) ;
#ifdef  MOT_ELM
                        outpw(PLC(p,PL_T_FOT_ASS),PLCS_FASSERT_S) ;
                        outpw(PLC(p,PL_T_FOT_DEASS),PLCS_FDEASSERT_S) ;
#endif  /* MOT_ELM */
                }
                else {
                        outpw(PLC(p,PL_CNTRL_C),PLCS_CONTROL_C_U) ;
#ifdef  MOT_ELM
                        outpw(PLC(p,PL_T_FOT_ASS),PLCS_FASSERT_U) ;
                        outpw(PLC(p,PL_T_FOT_DEASS),PLCS_FDEASSERT_U) ;
#endif  /* MOT_ELM */
                }
        }

        /*
         * set timer register
         */
        for ( i = 0 ; pltm[i].timer; i++)       /* set timer parameter reg */
                outpw(PLC(p,pltm[i].timer),pltm[i].para) ;

        (void)inpw(PLC(p,PL_INTR_EVENT)) ;      /* clear interrupt event reg */
        plc_clear_irq(smc,p) ;
        outpw(PLC(p,PL_INTR_MASK),plc_imsk_na); /* enable non active irq's */

        /*
         * if PCM is configured for class s, it will NOT go to the
         * REMOVE state if offline (page 3-36;)
         * in the concentrator, all inactive PHYS always must be in
         * the remove state
         * there's no real need to use this feature at all ..
         */
#ifndef CONCENTRATOR
        if ((smc->s.sas == SMT_SAS) && (p == PS)) {
                outpw(PLC(p,PL_CNTRL_B),PL_CLASS_S) ;
        }
#endif
}

/*
 * control PCM state machine
 */
static void plc_go_state(struct s_smc *smc, int p, int state)
{
        HW_PTR port ;
        int val ;

        SK_UNUSED(smc) ;

        port = (HW_PTR) (PLC(p,PL_CNTRL_B)) ;
        val = inpw(port) & ~(PL_PCM_CNTRL | PL_MAINT) ;
        outpw(port,val) ;
        outpw(port,val | state) ;
}

/*
 * read current line state (called by ECM & PCM)
 */
int sm_pm_get_ls(struct s_smc *smc, int phy)
{
        int     state ;

#ifdef  CONCENTRATOR
        if (!plc_is_installed(smc,phy))
                return PC_QLS;
#endif

        state = inpw(PLC(phy,PL_STATUS_A)) & PL_LINE_ST ;
        switch(state) {
        case PL_L_QLS:
                state = PC_QLS ;
                break ;
        case PL_L_MLS:
                state = PC_MLS ;
                break ;
        case PL_L_HLS:
                state = PC_HLS ;
                break ;
        case PL_L_ILS4:
        case PL_L_ILS16:
                state = PC_ILS ;
                break ;
        case PL_L_ALS:
                state = PC_LS_PDR ;
                break ;
        default :
                state = PC_LS_NONE ;
        }
        return state;
}

static int plc_send_bits(struct s_smc *smc, struct s_phy *phy, int len)
{
        int np = phy->np ;              /* PHY index */
        int     n ;
        int     i ;

        SK_UNUSED(smc) ;

        /* create bit vector */
        for (i = len-1,n = 0 ; i >= 0 ; i--) {
                n = (n<<1) | phy->t_val[phy->bitn+i] ;
        }
        if (inpw(PLC(np,PL_STATUS_B)) & PL_PCM_SIGNAL) {
#if     0
                printf("PL_PCM_SIGNAL is set\n") ;
#endif
                return 1;
        }
        /* write bit[n] & length = 1 to regs */
        outpw(PLC(np,PL_VECTOR_LEN),len-1) ;    /* len=nr-1 */
        outpw(PLC(np,PL_XMIT_VECTOR),n) ;
#ifdef  DEBUG
#if 1
#ifdef  DEBUG_BRD
        if (smc->debug.d_plc & 0x80)
#else
        if (debug.d_plc & 0x80)
#endif
                printf("SIGNALING bit %d .. %d\n",phy->bitn,phy->bitn+len-1) ;
#endif
#endif
        return 0;
}

/*
 * config plc muxes
 */
void plc_config_mux(struct s_smc *smc, int mux)
{
        if (smc->s.sas != SMT_DAS)
                return ;
        if (mux == MUX_WRAPB) {
                SETMASK(PLC(PA,PL_CNTRL_B),PL_CONFIG_CNTRL,PL_CONFIG_CNTRL) ;
                SETMASK(PLC(PA,PL_CNTRL_A),PL_SC_REM_LOOP,PL_SC_REM_LOOP) ;
        }
        else {
                CLEAR(PLC(PA,PL_CNTRL_B),PL_CONFIG_CNTRL) ;
                CLEAR(PLC(PA,PL_CNTRL_A),PL_SC_REM_LOOP) ;
        }
        CLEAR(PLC(PB,PL_CNTRL_B),PL_CONFIG_CNTRL) ;
        CLEAR(PLC(PB,PL_CNTRL_A),PL_SC_REM_LOOP) ;
}

/*
        PCM state machine
        called by dispatcher  & fddi_init() (driver)
        do
                display state change
                process event
        until SM is stable
*/
void pcm(struct s_smc *smc, const int np, int event)
{
        int     state ;
        int     oldstate ;
        struct s_phy    *phy ;
        struct fddi_mib_p       *mib ;

#ifndef CONCENTRATOR
        /*
         * ignore 2nd PHY if SAS
         */
        if ((np != PS) && (smc->s.sas == SMT_SAS))
                return ;
#endif
        phy = &smc->y[np] ;
        mib = phy->mib ;
        oldstate = mib->fddiPORTPCMState ;
        do {
                DB_PCM("PCM %c: state %s%s, event %s",
                       phy->phy_name,
                       mib->fddiPORTPCMState & AFLAG ? "ACTIONS " : "",
                       pcm_states[mib->fddiPORTPCMState & ~AFLAG],
                       pcm_events[event]);
                state = mib->fddiPORTPCMState ;
                pcm_fsm(smc,phy,event) ;
                event = 0 ;
        } while (state != mib->fddiPORTPCMState) ;
        /*
         * because the PLC does the bit signaling for us,
         * we're always in SIGNAL state
         * the MIB want's to see CONNECT
         * we therefore fake an entry in the MIB
         */
        if (state == PC5_SIGNAL)
                mib->fddiPORTPCMStateX = PC3_CONNECT ;
        else
                mib->fddiPORTPCMStateX = state ;

#ifndef SLIM_SMT
        /*
         * path change
         */
        if (    mib->fddiPORTPCMState != oldstate &&
                ((oldstate == PC8_ACTIVE) || (mib->fddiPORTPCMState == PC8_ACTIVE))) {
                smt_srf_event(smc,SMT_EVENT_PORT_PATH_CHANGE,
                        (int) (INDEX_PORT+ phy->np),0) ;
        }
#endif

#ifdef FDDI_MIB
        /* check whether a snmp-trap has to be sent */

        if ( mib->fddiPORTPCMState != oldstate ) {
                /* a real state change took place */
                DB_SNMP ("PCM from %d to %d\n", oldstate, mib->fddiPORTPCMState);
                if ( mib->fddiPORTPCMState == PC0_OFF ) {
                        /* send first trap */
                        snmp_fddi_trap (smc, 1, (int) mib->fddiPORTIndex );
                } else if ( oldstate == PC0_OFF ) {
                        /* send second trap */
                        snmp_fddi_trap (smc, 2, (int) mib->fddiPORTIndex );
                } else if ( mib->fddiPORTPCMState != PC2_TRACE &&
                        oldstate == PC8_ACTIVE ) {
                        /* send third trap */
                        snmp_fddi_trap (smc, 3, (int) mib->fddiPORTIndex );
                } else if ( mib->fddiPORTPCMState == PC8_ACTIVE ) {
                        /* send fourth trap */
                        snmp_fddi_trap (smc, 4, (int) mib->fddiPORTIndex );
                }
        }
#endif

        pcm_state_change(smc,np,state) ;
}

/*
 * PCM state machine
 */
static void pcm_fsm(struct s_smc *smc, struct s_phy *phy, int cmd)
{
        int     i ;
        int     np = phy->np ;          /* PHY index */
        struct s_plc    *plc ;
        struct fddi_mib_p       *mib ;
#ifndef MOT_ELM
        u_short plc_rev ;               /* Revision of the plc */
#endif  /* nMOT_ELM */

        plc = &phy->plc ;
        mib = phy->mib ;

        /*
         * general transitions independent of state
         */
        switch (cmd) {
        case PC_STOP :
                /*PC00-PC80*/
                if (mib->fddiPORTPCMState != PC9_MAINT) {
                        GO_STATE(PC0_OFF) ;
                        AIX_EVENT(smc, (u_long) FDDI_RING_STATUS, (u_long)
                                FDDI_PORT_EVENT, (u_long) FDDI_PORT_STOP,
                                smt_get_port_event_word(smc));
                }
                return ;
        case PC_START :
                /*PC01-PC81*/
                if (mib->fddiPORTPCMState != PC9_MAINT)
                        GO_STATE(PC1_BREAK) ;
                return ;
        case PC_DISABLE :
                /* PC09-PC99 */
                GO_STATE(PC9_MAINT) ;
                AIX_EVENT(smc, (u_long) FDDI_RING_STATUS, (u_long)
                        FDDI_PORT_EVENT, (u_long) FDDI_PORT_DISABLED,
                        smt_get_port_event_word(smc));
                return ;
        case PC_TIMEOUT_LCT :
                /* if long or extended LCT */
                stop_pcm_timer0(smc,phy) ;
                CLEAR(PLC(np,PL_CNTRL_B),PL_LONG) ;
                /* end of LCT is indicate by PCM_CODE (initiate PCM event) */
                return ;
        }

        switch(mib->fddiPORTPCMState) {
        case ACTIONS(PC0_OFF) :
                stop_pcm_timer0(smc,phy) ;
                outpw(PLC(np,PL_CNTRL_A),0) ;
                CLEAR(PLC(np,PL_CNTRL_B),PL_PC_JOIN) ;
                CLEAR(PLC(np,PL_CNTRL_B),PL_LONG) ;
                sm_ph_lem_stop(smc,np) ;                /* disable LEM */
                phy->cf_loop = FALSE ;
                phy->cf_join = FALSE ;
                queue_event(smc,EVENT_CFM,CF_JOIN+np) ;
                plc_go_state(smc,np,PL_PCM_STOP) ;
                mib->fddiPORTConnectState = PCM_DISABLED ;
                ACTIONS_DONE() ;
                break ;
        case PC0_OFF:
                /*PC09*/
                if (cmd == PC_MAINT) {
                        GO_STATE(PC9_MAINT) ;
                        break ;
                }
                break ;
        case ACTIONS(PC1_BREAK) :
                /* Stop the LCT timer if we came from Signal state */
                stop_pcm_timer0(smc,phy) ;
                ACTIONS_DONE() ;
                plc_go_state(smc,np,0) ;
                CLEAR(PLC(np,PL_CNTRL_B),PL_PC_JOIN) ;
                CLEAR(PLC(np,PL_CNTRL_B),PL_LONG) ;
                sm_ph_lem_stop(smc,np) ;                /* disable LEM */
                /*
                 * if vector is already loaded, go to OFF to clear PCM_SIGNAL
                 */
#if     0
                if (inpw(PLC(np,PL_STATUS_B)) & PL_PCM_SIGNAL) {
                        plc_go_state(smc,np,PL_PCM_STOP) ;
                        /* TB_MIN ? */
                }
#endif
                /*
                 * Go to OFF state in any case.
                 */
                plc_go_state(smc,np,PL_PCM_STOP) ;

                if (mib->fddiPORTPC_Withhold == PC_WH_NONE)
                        mib->fddiPORTConnectState = PCM_CONNECTING ;
                phy->cf_loop = FALSE ;
                phy->cf_join = FALSE ;
                queue_event(smc,EVENT_CFM,CF_JOIN+np) ;
                phy->ls_flag = FALSE ;
                phy->pc_mode = PM_NONE ;        /* needed by CFM */
                phy->bitn = 0 ;                 /* bit signaling start bit */
                for (i = 0 ; i < 3 ; i++)
                        pc_tcode_actions(smc,i,phy) ;

                /* Set the non-active interrupt mask register */
                outpw(PLC(np,PL_INTR_MASK),plc_imsk_na) ;

                /*
                 * If the LCT was stopped. There might be a
                 * PCM_CODE interrupt event present.
                 * This must be cleared.
                 */
                (void)inpw(PLC(np,PL_INTR_EVENT)) ;
#ifndef MOT_ELM
                /* Get the plc revision for revision dependent code */
                plc_rev = inpw(PLC(np,PL_STATUS_A)) & PLC_REV_MASK ;

                if (plc_rev != PLC_REV_SN3)
#endif  /* MOT_ELM */
                {
                        /*
                         * No supernet III PLC, so set Xmit verctor and
                         * length BEFORE starting the state machine.
                         */
                        if (plc_send_bits(smc,phy,3)) {
                                return ;
                        }
                }

                /*
                 * Now give the Start command.
                 * - The start command shall be done before setting the bits
                 *   to be signaled. (In PLC-S description and PLCS in SN3.
                 * - The start command shall be issued AFTER setting the
                 *   XMIT vector and the XMIT length register.
                 *
                 * We do it exactly according this specs for the old PLC and
                 * the new PLCS inside the SN3.
                 * For the usual PLCS we try it the way it is done for the
                 * old PLC and set the XMIT registers again, if the PLC is
                 * not in SIGNAL state. This is done according to an PLCS
                 * errata workaround.
                 */

                plc_go_state(smc,np,PL_PCM_START) ;

                /*
                 * workaround for PLC-S eng. sample errata
                 */
#ifdef  MOT_ELM
                if (!(inpw(PLC(np,PL_STATUS_B)) & PL_PCM_SIGNAL))
#else   /* nMOT_ELM */
                if (((inpw(PLC(np,PL_STATUS_A)) & PLC_REV_MASK) !=
                        PLC_REVISION_A) &&
                        !(inpw(PLC(np,PL_STATUS_B)) & PL_PCM_SIGNAL))
#endif  /* nMOT_ELM */
                {
                        /*
                         * Set register again (PLCS errata) or the first time
                         * (new SN3 PLCS).
                         */
                        (void) plc_send_bits(smc,phy,3) ;
                }
                /*
                 * end of workaround
                 */

                GO_STATE(PC5_SIGNAL) ;
                plc->p_state = PS_BIT3 ;
                plc->p_bits = 3 ;
                plc->p_start = 0 ;

                break ;
        case PC1_BREAK :
                break ;
        case ACTIONS(PC2_TRACE) :
                plc_go_state(smc,np,PL_PCM_TRACE) ;
                ACTIONS_DONE() ;
                break ;
        case PC2_TRACE :
                break ;

        case PC3_CONNECT :      /* these states are done by hardware */
        case PC4_NEXT :
                break ;

        case ACTIONS(PC5_SIGNAL) :
                ACTIONS_DONE() ;
                fallthrough;
        case PC5_SIGNAL :
                if ((cmd != PC_SIGNAL) && (cmd != PC_TIMEOUT_LCT))
                        break ;
                switch (plc->p_state) {
                case PS_BIT3 :
                        for (i = 0 ; i <= 2 ; i++)
                                pc_rcode_actions(smc,i,phy) ;
                        pc_tcode_actions(smc,3,phy) ;
                        plc->p_state = PS_BIT4 ;
                        plc->p_bits = 1 ;
                        plc->p_start = 3 ;
                        phy->bitn = 3 ;
                        if (plc_send_bits(smc,phy,1)) {
                                return ;
                        }
                        break ;
                case PS_BIT4 :
                        pc_rcode_actions(smc,3,phy) ;
                        for (i = 4 ; i <= 6 ; i++)
                                pc_tcode_actions(smc,i,phy) ;
                        plc->p_state = PS_BIT7 ;
                        plc->p_bits = 3 ;
                        plc->p_start = 4 ;
                        phy->bitn = 4 ;
                        if (plc_send_bits(smc,phy,3)) {
                                return ;
                        }
                        break ;
                case PS_BIT7 :
                        for (i = 3 ; i <= 6 ; i++)
                                pc_rcode_actions(smc,i,phy) ;
                        plc->p_state = PS_LCT ;
                        plc->p_bits = 0 ;
                        plc->p_start = 7 ;
                        phy->bitn = 7 ;
                sm_ph_lem_start(smc,np,(int)smc->s.lct_short) ; /* enable LEM */
                        /* start LCT */
                        i = inpw(PLC(np,PL_CNTRL_B)) & ~PL_PC_LOOP ;
                        outpw(PLC(np,PL_CNTRL_B),i) ;   /* must be cleared */
                        outpw(PLC(np,PL_CNTRL_B),i | PL_RLBP) ;
                        break ;
                case PS_LCT :
                        /* check for local LCT failure */
                        pc_tcode_actions(smc,7,phy) ;
                        /*
                         * set tval[7]
                         */
                        plc->p_state = PS_BIT8 ;
                        plc->p_bits = 1 ;
                        plc->p_start = 7 ;
                        phy->bitn = 7 ;
                        if (plc_send_bits(smc,phy,1)) {
                                return ;
                        }
                        break ;
                case PS_BIT8 :
                        /* check for remote LCT failure */
                        pc_rcode_actions(smc,7,phy) ;
                        if (phy->t_val[7] || phy->r_val[7]) {
                                plc_go_state(smc,np,PL_PCM_STOP) ;
                                GO_STATE(PC1_BREAK) ;
                                break ;
                        }
                        for (i = 8 ; i <= 9 ; i++)
                                pc_tcode_actions(smc,i,phy) ;
                        plc->p_state = PS_JOIN ;
                        plc->p_bits = 2 ;
                        plc->p_start = 8 ;
                        phy->bitn = 8 ;
                        if (plc_send_bits(smc,phy,2)) {
                                return ;
                        }
                        break ;
                case PS_JOIN :
                        for (i = 8 ; i <= 9 ; i++)
                                pc_rcode_actions(smc,i,phy) ;
                        plc->p_state = PS_ACTIVE ;
                        GO_STATE(PC6_JOIN) ;
                        break ;
                }
                break ;

        case ACTIONS(PC6_JOIN) :
                /*
                 * prevent mux error when going from WRAP_A to WRAP_B
                 */
                if (smc->s.sas == SMT_DAS && np == PB &&
                        (smc->y[PA].pc_mode == PM_TREE ||
                         smc->y[PB].pc_mode == PM_TREE)) {
                        SETMASK(PLC(np,PL_CNTRL_A),
                                PL_SC_REM_LOOP,PL_SC_REM_LOOP) ;
                        SETMASK(PLC(np,PL_CNTRL_B),
                                PL_CONFIG_CNTRL,PL_CONFIG_CNTRL) ;
                }
                SETMASK(PLC(np,PL_CNTRL_B),PL_PC_JOIN,PL_PC_JOIN) ;
                SETMASK(PLC(np,PL_CNTRL_B),PL_PC_JOIN,PL_PC_JOIN) ;
                ACTIONS_DONE() ;
                cmd = 0 ;
                fallthrough;
        case PC6_JOIN :
                switch (plc->p_state) {
                case PS_ACTIVE:
                        /*PC88b*/
                        if (!phy->cf_join) {
                                phy->cf_join = TRUE ;
                                queue_event(smc,EVENT_CFM,CF_JOIN+np) ;
                        }
                        if (cmd == PC_JOIN)
                                GO_STATE(PC8_ACTIVE) ;
                        /*PC82*/
                        if (cmd == PC_TRACE) {
                                GO_STATE(PC2_TRACE) ;
                                break ;
                        }
                        break ;
                }
                break ;

        case PC7_VERIFY :
                break ;

        case ACTIONS(PC8_ACTIVE) :
                /*
                 * start LEM for SMT
                 */
                sm_ph_lem_start(smc,(int)phy->np,LCT_LEM_MAX) ;

                phy->tr_flag = FALSE ;
                mib->fddiPORTConnectState = PCM_ACTIVE ;

                /* Set the active interrupt mask register */
                outpw(PLC(np,PL_INTR_MASK),plc_imsk_act) ;

                ACTIONS_DONE() ;
                break ;
        case PC8_ACTIVE :
                /*PC81 is done by PL_TNE_EXPIRED irq */
                /*PC82*/
                if (cmd == PC_TRACE) {
                        GO_STATE(PC2_TRACE) ;
                        break ;
                }
                /*PC88c: is done by TRACE_PROP irq */

                break ;
        case ACTIONS(PC9_MAINT) :
                stop_pcm_timer0(smc,phy) ;
                CLEAR(PLC(np,PL_CNTRL_B),PL_PC_JOIN) ;
                CLEAR(PLC(np,PL_CNTRL_B),PL_LONG) ;
                CLEAR(PLC(np,PL_INTR_MASK),PL_LE_CTR) ; /* disable LEM int. */
                sm_ph_lem_stop(smc,np) ;                /* disable LEM */
                phy->cf_loop = FALSE ;
                phy->cf_join = FALSE ;
                queue_event(smc,EVENT_CFM,CF_JOIN+np) ;

                plc_go_state(smc,np,PL_PCM_STOP) ;
                mib->fddiPORTConnectState = PCM_DISABLED ;
                SETMASK(PLC(np,PL_CNTRL_B),PL_MAINT,PL_MAINT) ;
                sm_ph_linestate(smc,np,(int) MIB2LS(mib->fddiPORTMaint_LS)) ;
                outpw(PLC(np,PL_CNTRL_A),PL_SC_BYPASS) ;
                ACTIONS_DONE() ;
                break ;
        case PC9_MAINT :
                DB_PCMN(1, "PCM %c : MAINT", phy->phy_name);
                /*PC90*/
                if (cmd == PC_ENABLE) {
                        GO_STATE(PC0_OFF) ;
                        break ;
                }
                break ;

        default:
                SMT_PANIC(smc,SMT_E0118, SMT_E0118_MSG) ;
                break ;
        }
}

/*
 * force line state on a PHY output     (only in MAINT state)
 */
static void sm_ph_linestate(struct s_smc *smc, int phy, int ls)
{
        int     cntrl ;

        SK_UNUSED(smc) ;

        cntrl = (inpw(PLC(phy,PL_CNTRL_B)) & ~PL_MAINT_LS) |
                                                PL_PCM_STOP | PL_MAINT ;
        switch(ls) {
        case PC_QLS:            /* Force Quiet */
                cntrl |= PL_M_QUI0 ;
                break ;
        case PC_MLS:            /* Force Master */
                cntrl |= PL_M_MASTR ;
                break ;
        case PC_HLS:            /* Force Halt */
                cntrl |= PL_M_HALT ;
                break ;
        default :
        case PC_ILS:            /* Force Idle */
                cntrl |= PL_M_IDLE ;
                break ;
        case PC_LS_PDR:         /* Enable repeat filter */
                cntrl |= PL_M_TPDR ;
                break ;
        }
        outpw(PLC(phy,PL_CNTRL_B),cntrl) ;
}

static void reset_lem_struct(struct s_phy *phy)
{
        struct lem_counter *lem = &phy->lem ;

        phy->mib->fddiPORTLer_Estimate = 15 ;
        lem->lem_float_ber = 15 * 100 ;
}

/*
 * link error monitor
 */
static void lem_evaluate(struct s_smc *smc, struct s_phy *phy)
{
        int ber ;
        u_long errors ;
        struct lem_counter *lem = &phy->lem ;
        struct fddi_mib_p       *mib ;
        int                     cond ;

        mib = phy->mib ;

        if (!lem->lem_on)
                return ;

        errors = inpw(PLC(((int) phy->np),PL_LINK_ERR_CTR)) ;
        lem->lem_errors += errors ;
        mib->fddiPORTLem_Ct += errors ;

        errors = lem->lem_errors ;
        /*
         * calculation is called on a intervall of 8 seconds
         *      -> this means, that one error in 8 sec. is one of 8*125*10E6
         *      the same as BER = 10E-9
         * Please note:
         *      -> 9 errors in 8 seconds mean:
         *         BER = 9 * 10E-9  and this is
         *          < 10E-8, so the limit of 10E-8 is not reached!
         */

                if (!errors)            ber = 15 ;
        else    if (errors <= 9)        ber = 9 ;
        else    if (errors <= 99)       ber = 8 ;
        else    if (errors <= 999)      ber = 7 ;
        else    if (errors <= 9999)     ber = 6 ;
        else    if (errors <= 99999)    ber = 5 ;
        else    if (errors <= 999999)   ber = 4 ;
        else    if (errors <= 9999999)  ber = 3 ;
        else    if (errors <= 99999999) ber = 2 ;
        else    if (errors <= 999999999) ber = 1 ;
        else                            ber = 0 ;

        /*
         * weighted average
         */
        ber *= 100 ;
        lem->lem_float_ber = lem->lem_float_ber * 7 + ber * 3 ;
        lem->lem_float_ber /= 10 ;
        mib->fddiPORTLer_Estimate = lem->lem_float_ber / 100 ;
        if (mib->fddiPORTLer_Estimate < 4) {
                mib->fddiPORTLer_Estimate = 4 ;
        }

        if (lem->lem_errors) {
                DB_PCMN(1, "LEM %c :", phy->np == PB ? 'B' : 'A');
                DB_PCMN(1, "errors      : %ld", lem->lem_errors);
                DB_PCMN(1, "sum_errors  : %ld", mib->fddiPORTLem_Ct);
                DB_PCMN(1, "current BER : 10E-%d", ber / 100);
                DB_PCMN(1, "float BER   : 10E-(%d/100)", lem->lem_float_ber);
                DB_PCMN(1, "avg. BER    : 10E-%d", mib->fddiPORTLer_Estimate);
        }

        lem->lem_errors = 0L ;

#ifndef SLIM_SMT
        cond = (mib->fddiPORTLer_Estimate <= mib->fddiPORTLer_Alarm) ?
                TRUE : FALSE ;
#ifdef  SMT_EXT_CUTOFF
        smt_ler_alarm_check(smc,phy,cond) ;
#endif  /* nSMT_EXT_CUTOFF */
        if (cond != mib->fddiPORTLerFlag) {
                smt_srf_event(smc,SMT_COND_PORT_LER,
                        (int) (INDEX_PORT+ phy->np) ,cond) ;
        }
#endif

        if (    mib->fddiPORTLer_Estimate <= mib->fddiPORTLer_Cutoff) {
                phy->pc_lem_fail = TRUE ;               /* flag */
                mib->fddiPORTLem_Reject_Ct++ ;
                /*
                 * "forgive 10e-2" if we cutoff so we can come
                 * up again ..
                 */
                lem->lem_float_ber += 2*100 ;

                /*PC81b*/
#ifdef  CONCENTRATOR
                DB_PCMN(1, "PCM: LER cutoff on port %d cutoff %d",
                        phy->np, mib->fddiPORTLer_Cutoff);
#endif
#ifdef  SMT_EXT_CUTOFF
                smt_port_off_event(smc,phy->np);
#else   /* nSMT_EXT_CUTOFF */
                queue_event(smc,(int)(EVENT_PCM+phy->np),PC_START) ;
#endif  /* nSMT_EXT_CUTOFF */
        }
}

/*
 * called by SMT to calculate LEM bit error rate
 */
void sm_lem_evaluate(struct s_smc *smc)
{
        int np ;

        for (np = 0 ; np < NUMPHYS ; np++)
                lem_evaluate(smc,&smc->y[np]) ;
}

static void lem_check_lct(struct s_smc *smc, struct s_phy *phy)
{
        struct lem_counter      *lem = &phy->lem ;
        struct fddi_mib_p       *mib ;
        int errors ;

        mib = phy->mib ;

        phy->pc_lem_fail = FALSE ;              /* flag */
        errors = inpw(PLC(((int)phy->np),PL_LINK_ERR_CTR)) ;
        lem->lem_errors += errors ;
        mib->fddiPORTLem_Ct += errors ;
        if (lem->lem_errors) {
                switch(phy->lc_test) {
                case LC_SHORT:
                        if (lem->lem_errors >= smc->s.lct_short)
                                phy->pc_lem_fail = TRUE ;
                        break ;
                case LC_MEDIUM:
                        if (lem->lem_errors >= smc->s.lct_medium)
                                phy->pc_lem_fail = TRUE ;
                        break ;
                case LC_LONG:
                        if (lem->lem_errors >= smc->s.lct_long)
                                phy->pc_lem_fail = TRUE ;
                        break ;
                case LC_EXTENDED:
                        if (lem->lem_errors >= smc->s.lct_extended)
                                phy->pc_lem_fail = TRUE ;
                        break ;
                }
                DB_PCMN(1, " >>errors : %lu", lem->lem_errors);
        }
        if (phy->pc_lem_fail) {
                mib->fddiPORTLCTFail_Ct++ ;
                mib->fddiPORTLem_Reject_Ct++ ;
        }
        else
                mib->fddiPORTLCTFail_Ct = 0 ;
}

/*
 * LEM functions
 */
static void sm_ph_lem_start(struct s_smc *smc, int np, int threshold)
{
        struct lem_counter *lem = &smc->y[np].lem ;

        lem->lem_on = 1 ;
        lem->lem_errors = 0L ;

        /* Do NOT reset mib->fddiPORTLer_Estimate here. It is called too
         * often.
         */

        outpw(PLC(np,PL_LE_THRESHOLD),threshold) ;
        (void)inpw(PLC(np,PL_LINK_ERR_CTR)) ;   /* clear error counter */

        /* enable LE INT */
        SETMASK(PLC(np,PL_INTR_MASK),PL_LE_CTR,PL_LE_CTR) ;
}

static void sm_ph_lem_stop(struct s_smc *smc, int np)
{
        struct lem_counter *lem = &smc->y[np].lem ;

        lem->lem_on = 0 ;
        CLEAR(PLC(np,PL_INTR_MASK),PL_LE_CTR) ;
}

/*
 * PCM pseudo code
 * receive actions are called AFTER the bit n is received,
 * i.e. if pc_rcode_actions(5) is called, bit 6 is the next bit to be received
 */

/*
 * PCM pseudo code 5.1 .. 6.1
 */
static void pc_rcode_actions(struct s_smc *smc, int bit, struct s_phy *phy)
{
        struct fddi_mib_p       *mib ;

        mib = phy->mib ;

        DB_PCMN(1, "SIG rec %x %x:", bit, phy->r_val[bit]);
        bit++ ;

        switch(bit) {
        case 0:
        case 1:
        case 2:
                break ;
        case 3 :
                if (phy->r_val[1] == 0 && phy->r_val[2] == 0)
                        mib->fddiPORTNeighborType = TA ;
                else if (phy->r_val[1] == 0 && phy->r_val[2] == 1)
                        mib->fddiPORTNeighborType = TB ;
                else if (phy->r_val[1] == 1 && phy->r_val[2] == 0)
                        mib->fddiPORTNeighborType = TS ;
                else if (phy->r_val[1] == 1 && phy->r_val[2] == 1)
                        mib->fddiPORTNeighborType = TM ;
                break ;
        case 4:
                if (mib->fddiPORTMy_Type == TM &&
                        mib->fddiPORTNeighborType == TM) {
                        DB_PCMN(1, "PCM %c : E100 withhold M-M",
                                phy->phy_name);
                        mib->fddiPORTPC_Withhold = PC_WH_M_M ;
                        RS_SET(smc,RS_EVENT) ;
                }
                else if (phy->t_val[3] || phy->r_val[3]) {
                        mib->fddiPORTPC_Withhold = PC_WH_NONE ;
                        if (mib->fddiPORTMy_Type == TM ||
                            mib->fddiPORTNeighborType == TM)
                                phy->pc_mode = PM_TREE ;
                        else
                                phy->pc_mode = PM_PEER ;

                        /* reevaluate the selection criteria (wc_flag) */
                        all_selection_criteria (smc);

                        if (phy->wc_flag) {
                                mib->fddiPORTPC_Withhold = PC_WH_PATH ;
                        }
                }
                else {
                        mib->fddiPORTPC_Withhold = PC_WH_OTHER ;
                        RS_SET(smc,RS_EVENT) ;
                        DB_PCMN(1, "PCM %c : E101 withhold other",
                                phy->phy_name);
                }
                phy->twisted = ((mib->fddiPORTMy_Type != TS) &&
                                (mib->fddiPORTMy_Type != TM) &&
                                (mib->fddiPORTNeighborType ==
                                mib->fddiPORTMy_Type)) ;
                if (phy->twisted) {
                        DB_PCMN(1, "PCM %c : E102 !!! TWISTED !!!",
                                phy->phy_name);
                }
                break ;
        case 5 :
                break ;
        case 6:
                if (phy->t_val[4] || phy->r_val[4]) {
                        if ((phy->t_val[4] && phy->t_val[5]) ||
                            (phy->r_val[4] && phy->r_val[5]) )
                                phy->lc_test = LC_EXTENDED ;
                        else
                                phy->lc_test = LC_LONG ;
                }
                else if (phy->t_val[5] || phy->r_val[5])
                        phy->lc_test = LC_MEDIUM ;
                else
                        phy->lc_test = LC_SHORT ;
                switch (phy->lc_test) {
                case LC_SHORT :                         /* 50ms */
                        outpw(PLC((int)phy->np,PL_LC_LENGTH), TP_LC_LENGTH ) ;
                        phy->t_next[7] = smc->s.pcm_lc_short ;
                        break ;
                case LC_MEDIUM :                        /* 500ms */
                        outpw(PLC((int)phy->np,PL_LC_LENGTH), TP_LC_LONGLN ) ;
                        phy->t_next[7] = smc->s.pcm_lc_medium ;
                        break ;
                case LC_LONG :
                        SETMASK(PLC((int)phy->np,PL_CNTRL_B),PL_LONG,PL_LONG) ;
                        phy->t_next[7] = smc->s.pcm_lc_long ;
                        break ;
                case LC_EXTENDED :
                        SETMASK(PLC((int)phy->np,PL_CNTRL_B),PL_LONG,PL_LONG) ;
                        phy->t_next[7] = smc->s.pcm_lc_extended ;
                        break ;
                }
                if (phy->t_next[7] > smc->s.pcm_lc_medium) {
                        start_pcm_timer0(smc,phy->t_next[7],PC_TIMEOUT_LCT,phy);
                }
                DB_PCMN(1, "LCT timer = %ld us", phy->t_next[7]);
                phy->t_next[9] = smc->s.pcm_t_next_9 ;
                break ;
        case 7:
                if (phy->t_val[6]) {
                        phy->cf_loop = TRUE ;
                }
                phy->td_flag = TRUE ;
                break ;
        case 8:
                if (phy->t_val[7] || phy->r_val[7]) {
                        DB_PCMN(1, "PCM %c : E103 LCT fail %s",
                                phy->phy_name,
                                phy->t_val[7] ? "local" : "remote");
                        queue_event(smc,(int)(EVENT_PCM+phy->np),PC_START) ;
                }
                break ;
        case 9:
                if (phy->t_val[8] || phy->r_val[8]) {
                        if (phy->t_val[8])
                                phy->cf_loop = TRUE ;
                        phy->td_flag = TRUE ;
                }
                break ;
        case 10:
                if (phy->r_val[9]) {
                        /* neighbor intends to have MAC on output */ ;
                        mib->fddiPORTMacIndicated.R_val = TRUE ;
                }
                else {
                        /* neighbor does not intend to have MAC on output */ ;
                        mib->fddiPORTMacIndicated.R_val = FALSE ;
                }
                break ;
        }
}

/*
 * PCM pseudo code 5.1 .. 6.1
 */
static void pc_tcode_actions(struct s_smc *smc, const int bit, struct s_phy *phy)
{
        int     np = phy->np ;
        struct fddi_mib_p       *mib ;

        mib = phy->mib ;

        switch(bit) {
        case 0:
                phy->t_val[0] = 0 ;             /* no escape used */
                break ;
        case 1:
                if (mib->fddiPORTMy_Type == TS || mib->fddiPORTMy_Type == TM)
                        phy->t_val[1] = 1 ;
                else
                        phy->t_val[1] = 0 ;
                break ;
        case 2 :
                if (mib->fddiPORTMy_Type == TB || mib->fddiPORTMy_Type == TM)
                        phy->t_val[2] = 1 ;
                else
                        phy->t_val[2] = 0 ;
                break ;
        case 3:
                {
                int     type,ne ;
                int     policy ;

                type = mib->fddiPORTMy_Type ;
                ne = mib->fddiPORTNeighborType ;
                policy = smc->mib.fddiSMTConnectionPolicy ;

                phy->t_val[3] = 1 ;     /* Accept connection */
                switch (type) {
                case TA :
                        if (
                                ((policy & POLICY_AA) && ne == TA) ||
                                ((policy & POLICY_AB) && ne == TB) ||
                                ((policy & POLICY_AS) && ne == TS) ||
                                ((policy & POLICY_AM) && ne == TM) )
                                phy->t_val[3] = 0 ;     /* Reject */
                        break ;
                case TB :
                        if (
                                ((policy & POLICY_BA) && ne == TA) ||
                                ((policy & POLICY_BB) && ne == TB) ||
                                ((policy & POLICY_BS) && ne == TS) ||
                                ((policy & POLICY_BM) && ne == TM) )
                                phy->t_val[3] = 0 ;     /* Reject */
                        break ;
                case TS :
                        if (
                                ((policy & POLICY_SA) && ne == TA) ||
                                ((policy & POLICY_SB) && ne == TB) ||
                                ((policy & POLICY_SS) && ne == TS) ||
                                ((policy & POLICY_SM) && ne == TM) )
                                phy->t_val[3] = 0 ;     /* Reject */
                        break ;
                case TM :
                        if (    ne == TM ||
                                ((policy & POLICY_MA) && ne == TA) ||
                                ((policy & POLICY_MB) && ne == TB) ||
                                ((policy & POLICY_MS) && ne == TS) ||
                                ((policy & POLICY_MM) && ne == TM) )
                                phy->t_val[3] = 0 ;     /* Reject */
                        break ;
                }
#ifndef SLIM_SMT
                /*
                 * detect undesirable connection attempt event
                 */
                if (    (type == TA && ne == TA ) ||
                        (type == TA && ne == TS ) ||
                        (type == TB && ne == TB ) ||
                        (type == TB && ne == TS ) ||
                        (type == TS && ne == TA ) ||
                        (type == TS && ne == TB ) ) {
                        smt_srf_event(smc,SMT_EVENT_PORT_CONNECTION,
                                (int) (INDEX_PORT+ phy->np) ,0) ;
                }
#endif
                }
                break ;
        case 4:
                if (mib->fddiPORTPC_Withhold == PC_WH_NONE) {
                        if (phy->pc_lem_fail) {
                                phy->t_val[4] = 1 ;     /* long */
                                phy->t_val[5] = 0 ;
                        }
                        else {
                                phy->t_val[4] = 0 ;
                                if (mib->fddiPORTLCTFail_Ct > 0)
                                        phy->t_val[5] = 1 ;     /* medium */
                                else
                                        phy->t_val[5] = 0 ;     /* short */

                                /*
                                 * Implementers choice: use medium
                                 * instead of short when undesired
                                 * connection attempt is made.
                                 */
                                if (phy->wc_flag)
                                        phy->t_val[5] = 1 ;     /* medium */
                        }
                        mib->fddiPORTConnectState = PCM_CONNECTING ;
                }
                else {
                        mib->fddiPORTConnectState = PCM_STANDBY ;
                        phy->t_val[4] = 1 ;     /* extended */
                        phy->t_val[5] = 1 ;
                }
                break ;
        case 5:
                break ;
        case 6:
                /* we do NOT have a MAC for LCT */
                phy->t_val[6] = 0 ;
                break ;
        case 7:
                phy->cf_loop = FALSE ;
                lem_check_lct(smc,phy) ;
                if (phy->pc_lem_fail) {
                        DB_PCMN(1, "PCM %c : E104 LCT failed", phy->phy_name);
                        phy->t_val[7] = 1 ;
                }
                else
                        phy->t_val[7] = 0 ;
                break ;
        case 8:
                phy->t_val[8] = 0 ;     /* Don't request MAC loopback */
                break ;
        case 9:
                phy->cf_loop = 0 ;
                if ((mib->fddiPORTPC_Withhold != PC_WH_NONE) ||
                     ((smc->s.sas == SMT_DAS) && (phy->wc_flag))) {
                        queue_event(smc,EVENT_PCM+np,PC_START) ;
                        break ;
                }
                phy->t_val[9] = FALSE ;
                switch (smc->s.sas) {
                case SMT_DAS :
                        /*
                         * MAC intended on output
                         */
                        if (phy->pc_mode == PM_TREE) {
                                if ((np == PB) || ((np == PA) &&
                                (smc->y[PB].mib->fddiPORTConnectState !=
                                        PCM_ACTIVE)))
                                        phy->t_val[9] = TRUE ;
                        }
                        else {
                                if (np == PB)
                                        phy->t_val[9] = TRUE ;
                        }
                        break ;
                case SMT_SAS :
                        if (np == PS)
                                phy->t_val[9] = TRUE ;
                        break ;
#ifdef  CONCENTRATOR
                case SMT_NAC :
                        /*
                         * MAC intended on output
                         */
                        if (np == PB)
                                phy->t_val[9] = TRUE ;
                        break ;
#endif
                }
                mib->fddiPORTMacIndicated.T_val = phy->t_val[9] ;
                break ;
        }
        DB_PCMN(1, "SIG snd %x %x:", bit, phy->t_val[bit]);
}

/*
 * return status twisted (called by SMT)
 */
int pcm_status_twisted(struct s_smc *smc)
{
        int     twist = 0 ;
        if (smc->s.sas != SMT_DAS)
                return 0;
        if (smc->y[PA].twisted && (smc->y[PA].mib->fddiPORTPCMState == PC8_ACTIVE))
                twist |= 1 ;
        if (smc->y[PB].twisted && (smc->y[PB].mib->fddiPORTPCMState == PC8_ACTIVE))
                twist |= 2 ;
        return twist;
}

/*
 * return status        (called by SMT)
 *      type
 *      state
 *      remote phy type
 *      remote mac yes/no
 */
void pcm_status_state(struct s_smc *smc, int np, int *type, int *state,
                      int *remote, int *mac)
{
        struct s_phy    *phy = &smc->y[np] ;
        struct fddi_mib_p       *mib ;

        mib = phy->mib ;

        /* remote PHY type and MAC - set only if active */
        *mac = 0 ;
        *type = mib->fddiPORTMy_Type ;          /* our PHY type */
        *state = mib->fddiPORTConnectState ;
        *remote = mib->fddiPORTNeighborType ;

        switch(mib->fddiPORTPCMState) {
        case PC8_ACTIVE :
                *mac = mib->fddiPORTMacIndicated.R_val ;
                break ;
        }
}

/*
 * return rooted station status (called by SMT)
 */
int pcm_rooted_station(struct s_smc *smc)
{
        int     n ;

        for (n = 0 ; n < NUMPHYS ; n++) {
                if (smc->y[n].mib->fddiPORTPCMState == PC8_ACTIVE &&
                    smc->y[n].mib->fddiPORTNeighborType == TM)
                        return 0;
        }
        return 1;
}

/*
 * Interrupt actions for PLC & PCM events
 */
void plc_irq(struct s_smc *smc, int np, unsigned int cmd)
/* int np;      PHY index */
{
        struct s_phy *phy = &smc->y[np] ;
        struct s_plc *plc = &phy->plc ;
        int             n ;
#ifdef  SUPERNET_3
        int             corr_mask ;
#endif  /* SUPERNET_3 */
        int             i ;

        if (np >= smc->s.numphys) {
                plc->soft_err++ ;
                return ;
        }
        if (cmd & PL_EBUF_ERR) {        /* elastic buff. det. over-|underflow*/
                /*
                 * Check whether the SRF Condition occurred.
                 */
                if (!plc->ebuf_cont && phy->mib->fddiPORTPCMState == PC8_ACTIVE){
                        /*
                         * This is the real Elasticity Error.
                         * More than one in a row are treated as a
                         * single one.
                         * Only count this in the active state.
                         */
                        phy->mib->fddiPORTEBError_Ct ++ ;

                }

                plc->ebuf_err++ ;
                if (plc->ebuf_cont <= 1000) {
                        /*
                         * Prevent counter from being wrapped after
                         * hanging years in that interrupt.
                         */
                        plc->ebuf_cont++ ;      /* Ebuf continuous error */
                }

#ifdef  SUPERNET_3
                if (plc->ebuf_cont == 1000 &&
                        ((inpw(PLC(np,PL_STATUS_A)) & PLC_REV_MASK) ==
                        PLC_REV_SN3)) {
                        /*
                         * This interrupt remeained high for at least
                         * 1000 consecutive interrupt calls.
                         *
                         * This is caused by a hardware error of the
                         * ORION part of the Supernet III chipset.
                         *
                         * Disable this bit from the mask.
                         */
                        corr_mask = (plc_imsk_na & ~PL_EBUF_ERR) ;
                        outpw(PLC(np,PL_INTR_MASK),corr_mask);

                        /*
                         * Disconnect from the ring.
                         * Call the driver with the reset indication.
                         */
                        queue_event(smc,EVENT_ECM,EC_DISCONNECT) ;

                        /*
                         * Make an error log entry.
                         */
                        SMT_ERR_LOG(smc,SMT_E0136, SMT_E0136_MSG) ;

                        /*
                         * Indicate the Reset.
                         */
                        drv_reset_indication(smc) ;
                }
#endif  /* SUPERNET_3 */
        } else {
                /* Reset the continuous error variable */
                plc->ebuf_cont = 0 ;    /* reset Ebuf continuous error */
        }
        if (cmd & PL_PHYINV) {          /* physical layer invalid signal */
                plc->phyinv++ ;
        }
        if (cmd & PL_VSYM_CTR) {        /* violation symbol counter has incr.*/
                plc->vsym_ctr++ ;
        }
        if (cmd & PL_MINI_CTR) {        /* dep. on PLC_CNTRL_A's MINI_CTR_INT*/
                plc->mini_ctr++ ;
        }
        if (cmd & PL_LE_CTR) {          /* link error event counter */
                int     j ;

                /*
                 * note: PL_LINK_ERR_CTR MUST be read to clear it
                 */
                j = inpw(PLC(np,PL_LE_THRESHOLD)) ;
                i = inpw(PLC(np,PL_LINK_ERR_CTR)) ;

                if (i < j) {
                        /* wrapped around */
                        i += 256 ;
                }

                if (phy->lem.lem_on) {
                        /* Note: Lem errors shall only be counted when
                         * link is ACTIVE or LCT is active.
                         */
                        phy->lem.lem_errors += i ;
                        phy->mib->fddiPORTLem_Ct += i ;
                }
        }
        if (cmd & PL_TPC_EXPIRED) {     /* TPC timer reached zero */
                if (plc->p_state == PS_LCT) {
                        /*
                         * end of LCT
                         */
                        ;
                }
                plc->tpc_exp++ ;
        }
        if (cmd & PL_LS_MATCH) {        /* LS == LS in PLC_CNTRL_B's MATCH_LS*/
                switch (inpw(PLC(np,PL_CNTRL_B)) & PL_MATCH_LS) {
                case PL_I_IDLE :        phy->curr_ls = PC_ILS ;         break ;
                case PL_I_HALT :        phy->curr_ls = PC_HLS ;         break ;
                case PL_I_MASTR :       phy->curr_ls = PC_MLS ;         break ;
                case PL_I_QUIET :       phy->curr_ls = PC_QLS ;         break ;
                }
        }
        if (cmd & PL_PCM_BREAK) {       /* PCM has entered the BREAK state */
                int     reason;

                reason = inpw(PLC(np,PL_STATUS_B)) & PL_BREAK_REASON ;

                switch (reason) {
                case PL_B_PCS :         plc->b_pcs++ ;  break ;
                case PL_B_TPC :         plc->b_tpc++ ;  break ;
                case PL_B_TNE :         plc->b_tne++ ;  break ;
                case PL_B_QLS :         plc->b_qls++ ;  break ;
                case PL_B_ILS :         plc->b_ils++ ;  break ;
                case PL_B_HLS :         plc->b_hls++ ;  break ;
                }

                /*jd 05-Aug-1999 changed: Bug #10419 */
                DB_PCMN(1, "PLC %d: MDcF = %x", np, smc->e.DisconnectFlag);
                if (smc->e.DisconnectFlag == FALSE) {
                        DB_PCMN(1, "PLC %d: restart (reason %x)", np, reason);
                        queue_event(smc,EVENT_PCM+np,PC_START) ;
                }
                else {
                        DB_PCMN(1, "PLC %d: NO!! restart (reason %x)",
                                np, reason);
                }
                return ;
        }
        /*
         * If both CODE & ENABLE are set ignore enable
         */
        if (cmd & PL_PCM_CODE) { /* receive last sign.-bit | LCT complete */
                queue_event(smc,EVENT_PCM+np,PC_SIGNAL) ;
                n = inpw(PLC(np,PL_RCV_VECTOR)) ;
                for (i = 0 ; i < plc->p_bits ; i++) {
                        phy->r_val[plc->p_start+i] = n & 1 ;
                        n >>= 1 ;
                }
        }
        else if (cmd & PL_PCM_ENABLED) { /* asserted SC_JOIN, scrub.completed*/
                queue_event(smc,EVENT_PCM+np,PC_JOIN) ;
        }
        if (cmd & PL_TRACE_PROP) {      /* MLS while PC8_ACTIV || PC2_TRACE */
                /*PC22b*/
                if (!phy->tr_flag) {
                        DB_PCMN(1, "PCM : irq TRACE_PROP %d %d",
                                np, smc->mib.fddiSMTECMState);
                        phy->tr_flag = TRUE ;
                        smc->e.trace_prop |= ENTITY_BIT(ENTITY_PHY(np)) ;
                        queue_event(smc,EVENT_ECM,EC_TRACE_PROP) ;
                }
        }
        /*
         * filter PLC glitch ???
         * QLS || HLS only while in PC2_TRACE state
         */
        if ((cmd & PL_SELF_TEST) && (phy->mib->fddiPORTPCMState == PC2_TRACE)) {
                /*PC22a*/
                if (smc->e.path_test == PT_PASSED) {
                        DB_PCMN(1, "PCM : state = %s %d",
                                get_pcmstate(smc, np),
                                phy->mib->fddiPORTPCMState);

                        smc->e.path_test = PT_PENDING ;
                        queue_event(smc,EVENT_ECM,EC_PATH_TEST) ;
                }
        }
        if (cmd & PL_TNE_EXPIRED) {     /* TNE: length of noise events */
                /* break_required (TNE > NS_Max) */
                if (phy->mib->fddiPORTPCMState == PC8_ACTIVE) {
                        if (!phy->tr_flag) {
                                DB_PCMN(1, "PCM %c : PC81 %s",
                                        phy->phy_name, "NSE");
                                queue_event(smc, EVENT_PCM + np, PC_START);
                                return;
                        }
                }
        }
#if     0
        if (cmd & PL_NP_ERR) {          /* NP has requested to r/w an inv reg*/
                /*
                 * It's a bug by AMD
                 */
                plc->np_err++ ;
        }
        /* pin inactiv (GND) */
        if (cmd & PL_PARITY_ERR) {      /* p. error dedected on TX9-0 inp */
                plc->parity_err++ ;
        }
        if (cmd & PL_LSDO) {            /* carrier detected */
                ;
        }
#endif
}

#ifdef  DEBUG
/*
 * fill state struct
 */
void pcm_get_state(struct s_smc *smc, struct smt_state *state)
{
        struct s_phy    *phy ;
        struct pcm_state *pcs ;
        int     i ;
        int     ii ;
        short   rbits ;
        short   tbits ;
        struct fddi_mib_p       *mib ;

        for (i = 0, phy = smc->y, pcs = state->pcm_state ; i < NUMPHYS ;
                i++ , phy++, pcs++ ) {
                mib = phy->mib ;
                pcs->pcm_type = (u_char) mib->fddiPORTMy_Type ;
                pcs->pcm_state = (u_char) mib->fddiPORTPCMState ;
                pcs->pcm_mode = phy->pc_mode ;
                pcs->pcm_neighbor = (u_char) mib->fddiPORTNeighborType ;
                pcs->pcm_bsf = mib->fddiPORTBS_Flag ;
                pcs->pcm_lsf = phy->ls_flag ;
                pcs->pcm_lct_fail = (u_char) mib->fddiPORTLCTFail_Ct ;
                pcs->pcm_ls_rx = LS2MIB(sm_pm_get_ls(smc,i)) ;
                for (ii = 0, rbits = tbits = 0 ; ii < NUMBITS ; ii++) {
                        rbits <<= 1 ;
                        tbits <<= 1 ;
                        if (phy->r_val[NUMBITS-1-ii])
                                rbits |= 1 ;
                        if (phy->t_val[NUMBITS-1-ii])
                                tbits |= 1 ;
                }
                pcs->pcm_r_val = rbits ;
                pcs->pcm_t_val = tbits ;
        }
}

int get_pcm_state(struct s_smc *smc, int np)
{
        int pcs ;

        SK_UNUSED(smc) ;

        switch (inpw(PLC(np,PL_STATUS_B)) & PL_PCM_STATE) {
                case PL_PC0 :   pcs = PC_STOP ;         break ;
                case PL_PC1 :   pcs = PC_START ;        break ;
                case PL_PC2 :   pcs = PC_TRACE ;        break ;
                case PL_PC3 :   pcs = PC_SIGNAL ;       break ;
                case PL_PC4 :   pcs = PC_SIGNAL ;       break ;
                case PL_PC5 :   pcs = PC_SIGNAL ;       break ;
                case PL_PC6 :   pcs = PC_JOIN ;         break ;
                case PL_PC7 :   pcs = PC_JOIN ;         break ;
                case PL_PC8 :   pcs = PC_ENABLE ;       break ;
                case PL_PC9 :   pcs = PC_MAINT ;        break ;
                default :       pcs = PC_DISABLE ;      break ;
        }
        return pcs;
}

char *get_linestate(struct s_smc *smc, int np)
{
        char *ls = "" ;

        SK_UNUSED(smc) ;

        switch (inpw(PLC(np,PL_STATUS_A)) & PL_LINE_ST) {
                case PL_L_NLS : ls = "NOISE" ;  break ;
                case PL_L_ALS : ls = "ACTIV" ;  break ;
                case PL_L_UND : ls = "UNDEF" ;  break ;
                case PL_L_ILS4: ls = "ILS 4" ;  break ;
                case PL_L_QLS : ls = "QLS" ;    break ;
                case PL_L_MLS : ls = "MLS" ;    break ;
                case PL_L_HLS : ls = "HLS" ;    break ;
                case PL_L_ILS16:ls = "ILS16" ;  break ;
#ifdef  lint
                default:        ls = "unknown" ; break ;
#endif
        }
        return ls;
}

char *get_pcmstate(struct s_smc *smc, int np)
{
        char *pcs ;
        
        SK_UNUSED(smc) ;

        switch (inpw(PLC(np,PL_STATUS_B)) & PL_PCM_STATE) {
                case PL_PC0 :   pcs = "OFF" ;           break ;
                case PL_PC1 :   pcs = "BREAK" ;         break ;
                case PL_PC2 :   pcs = "TRACE" ;         break ;
                case PL_PC3 :   pcs = "CONNECT";        break ;
                case PL_PC4 :   pcs = "NEXT" ;          break ;
                case PL_PC5 :   pcs = "SIGNAL" ;        break ;
                case PL_PC6 :   pcs = "JOIN" ;          break ;
                case PL_PC7 :   pcs = "VERIFY" ;        break ;
                case PL_PC8 :   pcs = "ACTIV" ;         break ;
                case PL_PC9 :   pcs = "MAINT" ;         break ;
                default :       pcs = "UNKNOWN" ;       break ;
        }
        return pcs;
}

void list_phy(struct s_smc *smc)
{
        struct s_plc *plc ;
        int np ;

        for (np = 0 ; np < NUMPHYS ; np++) {
                plc  = &smc->y[np].plc ;
                printf("PHY %d:\tERRORS\t\t\tBREAK_REASONS\t\tSTATES:\n",np) ;
                printf("\tsoft_error: %ld \t\tPC_Start : %ld\n",
                                                plc->soft_err,plc->b_pcs);
                printf("\tparity_err: %ld \t\tTPC exp. : %ld\t\tLine: %s\n",
                        plc->parity_err,plc->b_tpc,get_linestate(smc,np)) ;
                printf("\tebuf_error: %ld \t\tTNE exp. : %ld\n",
                                                plc->ebuf_err,plc->b_tne) ;
                printf("\tphyinvalid: %ld \t\tQLS det. : %ld\t\tPCM : %s\n",
                        plc->phyinv,plc->b_qls,get_pcmstate(smc,np)) ;
                printf("\tviosym_ctr: %ld \t\tILS det. : %ld\n",
                                                plc->vsym_ctr,plc->b_ils)  ;
                printf("\tmingap_ctr: %ld \t\tHLS det. : %ld\n",
                                                plc->mini_ctr,plc->b_hls) ;
                printf("\tnodepr_err: %ld\n",plc->np_err) ;
                printf("\tTPC_exp : %ld\n",plc->tpc_exp) ;
                printf("\tLEM_err : %ld\n",smc->y[np].lem.lem_errors) ;
        }
}


#ifdef  CONCENTRATOR
void pcm_lem_dump(struct s_smc *smc)
{
        int             i ;
        struct s_phy    *phy ;
        struct fddi_mib_p       *mib ;

        char            *entostring() ;

        printf("PHY     errors  BER\n") ;
        printf("----------------------\n") ;
        for (i = 0,phy = smc->y ; i < NUMPHYS ; i++,phy++) {
                if (!plc_is_installed(smc,i))
                        continue ;
                mib = phy->mib ;
                printf("%s\t%ld\t10E-%d\n",
                        entostring(smc,ENTITY_PHY(i)),
                        mib->fddiPORTLem_Ct,
                        mib->fddiPORTLer_Estimate) ;
        }
}
#endif
#endif