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NetBSD/sys/dev/ic/isic_l1fsm.c
martin 5171d409a5 First step to cleanup the hardware driver <-> upper layers interface. 
This now provides slightly more functionality than the FreeBSD layer1-newbus
interface. It was meant to be a simple change to one header and a few
c files, but the change rippled all through various stuff.

To prevent a change to the kernel<->userland interface right now the kernel
is now lying about card types to userland (but who cares). This will be fixed
when the userland interface changes, after layer 3 <-> layer 4 has been
fixed.

Functional changes:

Provide a clean interface for hardware drivers to attach to the upper
layers. This will need another small change in the B-channel handling
when a similar change to the layer 3 <-> layer 4 interface happens.

Avoid passing indices into global arrays of pointers around, instead pass
the pointers itself. Don't code hardware driver types by predefined magic
numbers (think LKM). Prepare for detachable drivers (think pcmcia).

While there remove some sets of function pointers always pointing to the
same function (meant to be the configurable set of D channel protocol
handlers). It is unlikely another supported D-channel protocol will fit into
that (maximal layer interface) abstraction. When we get support for another
protocol, we will need to come up with a workable interface. Besides, the
old implementation was, uhm, strange.
2001-03-24 12:40:29 +00:00

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/*
* Copyright (c) 1997, 2000 Hellmuth Michaelis. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
*---------------------------------------------------------------------------
*
* i4b_l1fsm.c - isdn4bsd layer 1 I.430 state machine
* --------------------------------------------------
*
* $Id: isic_l1fsm.c,v 1.2 2001/03/24 12:40:30 martin Exp $
*
* last edit-date: [Fri Jan 5 11:36:11 2001]
*
*---------------------------------------------------------------------------*/
#include <sys/param.h>
#if defined(__FreeBSD__) && __FreeBSD__ >= 3
#include <sys/ioccom.h>
#else
#include <sys/ioctl.h>
#endif
#include <sys/kernel.h>
#include <sys/systm.h>
#include <sys/mbuf.h>
#include <machine/stdarg.h>
#ifdef __FreeBSD__
#include <machine/clock.h>
#include <i386/isa/isa_device.h>
#else
#ifndef __bsdi__
#include <machine/bus.h>
#endif
#include <sys/device.h>
#endif
#include <sys/socket.h>
#include <net/if.h>
#if defined(__NetBSD__) && __NetBSD_Version__ >= 104230000
#include <sys/callout.h>
#endif
#ifdef __FreeBSD__
#include <machine/i4b_debug.h>
#include <machine/i4b_ioctl.h>
#else
#include <netisdn/i4b_debug.h>
#include <netisdn/i4b_ioctl.h>
#endif
#include <dev/ic/isic_l1.h>
#include <dev/ic/isac.h>
#include <dev/ic/hscx.h>
#include <netisdn/i4b_global.h>
#include <netisdn/i4b_trace.h>
#include <netisdn/i4b_l1l2.h>
#include <netisdn/i4b_mbuf.h>
static char *state_text[N_STATES] = {
"F3 Deactivated",
"F4 Awaiting Signal",
"F5 Identifying Input",
"F6 Synchronized",
"F7 Activated",
"F8 Lost Framing",
"Illegal State"
};
static char *event_text[N_EVENTS] = {
"EV_PHAR PH_ACT_REQ",
"EV_T3 Timer 3 expired",
"EV_INFO0 INFO0 received",
"EV_RSY Level Detected",
"EV_INFO2 INFO2 received",
"EV_INFO48 INFO4 received",
"EV_INFO410 INFO4 received",
"EV_DR Deactivate Req",
"EV_PU Power UP",
"EV_DIS Disconnected",
"EV_EI Error Ind",
"Illegal Event"
};
/* Function prototypes */
static void timer3_expired (struct l1_softc *sc);
static void T3_start (struct l1_softc *sc);
static void T3_stop (struct l1_softc *sc);
static void F_T3ex (struct l1_softc *sc);
static void timer4_expired (struct l1_softc *sc);
static void T4_start (struct l1_softc *sc);
static void T4_stop (struct l1_softc *sc);
static void F_AI8 (struct l1_softc *sc);
static void F_AI10 (struct l1_softc *sc);
static void F_I01 (struct l1_softc *sc);
static void F_I02 (struct l1_softc *sc);
static void F_I03 (struct l1_softc *sc);
static void F_I2 (struct l1_softc *sc);
static void F_ill (struct l1_softc *sc);
static void F_NULL (struct l1_softc *sc);
/*---------------------------------------------------------------------------*
* I.430 Timer T3 expire function
*---------------------------------------------------------------------------*/
static void
timer3_expired(struct l1_softc *sc)
{
if(sc->sc_I430T3)
{
NDBGL1(L1_T_ERR, "state = %s", isic_printstate(sc));
sc->sc_I430T3 = 0;
/* XXX try some recovery here XXX */
isic_recover(sc);
sc->sc_init_tries++; /* increment retry count */
/*XXX*/ if(sc->sc_init_tries > 4)
{
int s = splnet();
sc->sc_init_tries = 0;
if(sc->sc_obuf2 != NULL)
{
i4b_Dfreembuf(sc->sc_obuf2);
sc->sc_obuf2 = NULL;
}
if(sc->sc_obuf != NULL)
{
i4b_Dfreembuf(sc->sc_obuf);
sc->sc_obuf = NULL;
sc->sc_freeflag = 0;
sc->sc_op = NULL;
sc->sc_ol = 0;
}
splx(s);
isdn_layer2_status_ind(sc->sc_l2, STI_NOL1ACC, 0);
}
isic_next_state(sc, EV_T3);
}
else
{
NDBGL1(L1_T_ERR, "expired without starting it ....");
}
}
/*---------------------------------------------------------------------------*
* I.430 Timer T3 start
*---------------------------------------------------------------------------*/
static void
T3_start(struct l1_softc *sc)
{
NDBGL1(L1_T_MSG, "state = %s", isic_printstate(sc));
sc->sc_I430T3 = 1;
START_TIMER(sc->sc_T3_callout, timer3_expired, sc, 2*hz);
}
/*---------------------------------------------------------------------------*
* I.430 Timer T3 stop
*---------------------------------------------------------------------------*/
static void
T3_stop(struct l1_softc *sc)
{
NDBGL1(L1_T_MSG, "state = %s", isic_printstate(sc));
sc->sc_init_tries = 0; /* init connect retry count */
if(sc->sc_I430T3)
{
sc->sc_I430T3 = 0;
STOP_TIMER(sc->sc_T3_callout, timer3_expired, sc);
}
}
/*---------------------------------------------------------------------------*
* I.430 Timer T3 expiry
*---------------------------------------------------------------------------*/
static void
F_T3ex(struct l1_softc *sc)
{
NDBGL1(L1_F_MSG, "FSM function F_T3ex executing");
if(ctrl_desc[sc->sc_unit].protocol != PROTOCOL_D64S)
isdn_layer2_activate_ind(sc->sc_l2, 0);
}
/*---------------------------------------------------------------------------*
* Timer T4 expire function
*---------------------------------------------------------------------------*/
static void
timer4_expired(struct l1_softc *sc)
{
if(sc->sc_I430T4)
{
NDBGL1(L1_T_MSG, "state = %s", isic_printstate(sc));
sc->sc_I430T4 = 0;
isdn_layer2_status_ind(sc->sc_l2, STI_PDEACT, 0);
}
else
{
NDBGL1(L1_T_ERR, "expired without starting it ....");
}
}
/*---------------------------------------------------------------------------*
* Timer T4 start
*---------------------------------------------------------------------------*/
static void
T4_start(struct l1_softc *sc)
{
NDBGL1(L1_T_MSG, "state = %s", isic_printstate(sc));
sc->sc_I430T4 = 1;
START_TIMER(sc->sc_T4_callout, timer4_expired, sc, hz);
}
/*---------------------------------------------------------------------------*
* Timer T4 stop
*---------------------------------------------------------------------------*/
static void
T4_stop(struct l1_softc *sc)
{
NDBGL1(L1_T_MSG, "state = %s", isic_printstate(sc));
if(sc->sc_I430T4)
{
sc->sc_I430T4 = 0;
STOP_TIMER(sc->sc_T4_callout, timer4_expired, sc);
}
}
/*---------------------------------------------------------------------------*
* FSM function: received AI8
*---------------------------------------------------------------------------*/
static void
F_AI8(struct l1_softc *sc)
{
T4_stop(sc);
NDBGL1(L1_F_MSG, "FSM function F_AI8 executing");
if(ctrl_desc[sc->sc_unit].protocol != PROTOCOL_D64S)
isdn_layer2_activate_ind(sc->sc_l2, 1);
T3_stop(sc);
if(sc->sc_trace & TRACE_I)
{
i4b_trace_hdr hdr;
char info = INFO4_8;
hdr.type = TRC_CH_I;
hdr.dir = FROM_NT;
hdr.count = 0;
isdn_layer2_trace_ind(sc->sc_l2, &hdr, 1, &info);
}
}
/*---------------------------------------------------------------------------*
* FSM function: received AI10
*---------------------------------------------------------------------------*/
static void
F_AI10(struct l1_softc *sc)
{
T4_stop(sc);
NDBGL1(L1_F_MSG, "FSM function F_AI10 executing");
if(ctrl_desc[sc->sc_unit].protocol != PROTOCOL_D64S)
isdn_layer2_activate_ind(sc->sc_l2, 1);
T3_stop(sc);
if(sc->sc_trace & TRACE_I)
{
i4b_trace_hdr hdr;
char info = INFO4_10;
hdr.type = TRC_CH_I;
hdr.dir = FROM_NT;
hdr.count = 0;
isdn_layer2_trace_ind(sc->sc_l2, &hdr, 1, &info);
}
}
/*---------------------------------------------------------------------------*
* FSM function: received INFO 0 in states F3 .. F5
*---------------------------------------------------------------------------*/
static void
F_I01(struct l1_softc *sc)
{
NDBGL1(L1_F_MSG, "FSM function F_I01 executing");
if(sc->sc_trace & TRACE_I)
{
i4b_trace_hdr hdr;
char info = INFO0;
hdr.type = TRC_CH_I;
hdr.dir = FROM_NT;
hdr.count = 0;
isdn_layer2_trace_ind(sc->sc_l2, &hdr, 1, &info);
}
}
/*---------------------------------------------------------------------------*
* FSM function: received INFO 0 in state F6
*---------------------------------------------------------------------------*/
static void
F_I02(struct l1_softc *sc)
{
NDBGL1(L1_F_MSG, "FSM function F_I02 executing");
if(ctrl_desc[sc->sc_unit].protocol != PROTOCOL_D64S)
isdn_layer2_activate_ind(sc->sc_l2, 0);
if(sc->sc_trace & TRACE_I)
{
i4b_trace_hdr hdr;
char info = INFO0;
hdr.type = TRC_CH_I;
hdr.dir = FROM_NT;
hdr.count = 0;
isdn_layer2_trace_ind(sc->sc_l2, &hdr, 1, &info);
}
}
/*---------------------------------------------------------------------------*
* FSM function: received INFO 0 in state F7 or F8
*---------------------------------------------------------------------------*/
static void
F_I03(struct l1_softc *sc)
{
NDBGL1(L1_F_MSG, "FSM function F_I03 executing");
if(ctrl_desc[sc->sc_unit].protocol != PROTOCOL_D64S)
isdn_layer2_activate_ind(sc->sc_l2, 0);
T4_start(sc);
if(sc->sc_trace & TRACE_I)
{
i4b_trace_hdr hdr;
char info = INFO0;
hdr.type = TRC_CH_I;
hdr.dir = FROM_NT;
hdr.count = 0;
isdn_layer2_trace_ind(sc->sc_l2, &hdr, 1, &info);
}
}
/*---------------------------------------------------------------------------*
* FSM function: activate request
*---------------------------------------------------------------------------*/
static void
F_AR(struct l1_softc *sc)
{
NDBGL1(L1_F_MSG, "FSM function F_AR executing");
if(sc->sc_trace & TRACE_I)
{
i4b_trace_hdr hdr;
char info = INFO1_8;
hdr.type = TRC_CH_I;
hdr.dir = FROM_TE;
hdr.count = 0;
isdn_layer2_trace_ind(sc->sc_l2, &hdr, 1, &info);
}
isic_isac_l1_cmd(sc, CMD_AR8);
T3_start(sc);
}
/*---------------------------------------------------------------------------*
* FSM function: received INFO2
*---------------------------------------------------------------------------*/
static void
F_I2(struct l1_softc *sc)
{
NDBGL1(L1_F_MSG, "FSM function F_I2 executing");
if(sc->sc_trace & TRACE_I)
{
i4b_trace_hdr hdr;
char info = INFO2;
hdr.type = TRC_CH_I;
hdr.dir = FROM_NT;
hdr.count = 0;
isdn_layer2_trace_ind(sc->sc_l2, &hdr, 1, &info);
}
}
/*---------------------------------------------------------------------------*
* illegal state default action
*---------------------------------------------------------------------------*/
static void
F_ill(struct l1_softc *sc)
{
NDBGL1(L1_F_ERR, "FSM function F_ill executing");
}
/*---------------------------------------------------------------------------*
* No action
*---------------------------------------------------------------------------*/
static void
F_NULL(struct l1_softc *sc)
{
NDBGL1(L1_F_MSG, "FSM function F_NULL executing");
}
/*---------------------------------------------------------------------------*
* layer 1 state transition table
*---------------------------------------------------------------------------*/
struct isic_state_tab {
void (*func) (struct l1_softc *sc); /* function to execute */
int newstate; /* next state */
} isic_state_tab[N_EVENTS][N_STATES] = {
/* STATE: F3 F4 F5 F6 F7 F8 ILLEGAL STATE */
/* -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------*/
/* EV_PHAR x*/ {{F_AR, ST_F4}, {F_NULL, ST_F4}, {F_NULL, ST_F5}, {F_NULL, ST_F6}, {F_ill, ST_ILL}, {F_NULL, ST_F8}, {F_ill, ST_ILL}},
/* EV_T3 x*/ {{F_NULL, ST_F3}, {F_T3ex, ST_F3}, {F_T3ex, ST_F3}, {F_T3ex, ST_F3}, {F_NULL, ST_F7}, {F_NULL, ST_F8}, {F_ill, ST_ILL}},
/* EV_INFO0 */ {{F_I01, ST_F3}, {F_I01, ST_F4}, {F_I01, ST_F5}, {F_I02, ST_F3}, {F_I03, ST_F3}, {F_I03, ST_F3}, {F_ill, ST_ILL}},
/* EV_RSY x*/ {{F_NULL, ST_F3}, {F_NULL, ST_F5}, {F_NULL, ST_F5}, {F_NULL, ST_F8}, {F_NULL, ST_F8}, {F_NULL, ST_F8}, {F_ill, ST_ILL}},
/* EV_INFO2 */ {{F_I2, ST_F6}, {F_I2, ST_F6}, {F_I2, ST_F6}, {F_I2, ST_F6}, {F_I2, ST_F6}, {F_I2, ST_F6}, {F_ill, ST_ILL}},
/* EV_INFO48*/ {{F_AI8, ST_F7}, {F_AI8, ST_F7}, {F_AI8, ST_F7}, {F_AI8, ST_F7}, {F_NULL, ST_F7}, {F_AI8, ST_F7}, {F_ill, ST_ILL}},
/* EV_INFO41*/ {{F_AI10, ST_F7}, {F_AI10, ST_F7}, {F_AI10, ST_F7}, {F_AI10, ST_F7}, {F_NULL, ST_F7}, {F_AI10, ST_F7}, {F_ill, ST_ILL}},
/* EV_DR */ {{F_NULL, ST_F3}, {F_NULL, ST_F4}, {F_NULL, ST_F5}, {F_NULL, ST_F6}, {F_NULL, ST_F7}, {F_NULL, ST_F8}, {F_ill, ST_ILL}},
/* EV_PU */ {{F_NULL, ST_F3}, {F_NULL, ST_F4}, {F_NULL, ST_F5}, {F_NULL, ST_F6}, {F_NULL, ST_F7}, {F_NULL, ST_F8}, {F_ill, ST_ILL}},
/* EV_DIS */ {{F_ill, ST_ILL}, {F_ill, ST_ILL}, {F_ill, ST_ILL}, {F_ill, ST_ILL}, {F_ill, ST_ILL}, {F_ill, ST_ILL}, {F_ill, ST_ILL}},
/* EV_EI */ {{F_NULL, ST_F3}, {F_NULL, ST_F3}, {F_NULL, ST_F3}, {F_NULL, ST_F3}, {F_NULL, ST_F3}, {F_NULL, ST_F3}, {F_ill, ST_ILL}},
/* EV_ILL */ {{F_ill, ST_ILL}, {F_ill, ST_ILL}, {F_ill, ST_ILL}, {F_ill, ST_ILL}, {F_ill, ST_ILL}, {F_ill, ST_ILL}, {F_ill, ST_ILL}}
};
/*---------------------------------------------------------------------------*
* event handler
*---------------------------------------------------------------------------*/
void
isic_next_state(struct l1_softc *sc, int event)
{
int currstate, newstate;
if(event >= N_EVENTS)
panic("i4b_l1fsm.c: event >= N_EVENTS\n");
currstate = sc->sc_I430state;
if(currstate >= N_STATES)
panic("i4b_l1fsm.c: currstate >= N_STATES\n");
newstate = isic_state_tab[event][currstate].newstate;
if(newstate >= N_STATES)
panic("i4b_l1fsm.c: newstate >= N_STATES\n");
NDBGL1(L1_F_MSG, "FSM event [%s]: [%s => %s]", event_text[event],
state_text[currstate],
state_text[newstate]);
(*isic_state_tab[event][currstate].func)(sc);
if(newstate == ST_ILL)
{
newstate = ST_F3;
NDBGL1(L1_F_ERR, "FSM Illegal State ERROR, oldstate = %s, newstate = %s, event = %s!",
state_text[currstate],
state_text[newstate],
event_text[event]);
}
sc->sc_I430state = newstate;
}
/*---------------------------------------------------------------------------*
* return pointer to current state description
*---------------------------------------------------------------------------*/
char *
isic_printstate(struct l1_softc *sc)
{
return((char *) state_text[sc->sc_I430state]);
}
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