2.11BSD/sys/vaxif/if_css.c
/*
* Copyright (c) 1982,1986,1988 Regents of the University of California.
* All rights reserved.
*
* Redistribution and use in source and binary forms are permitted
* provided that this notice is preserved and that due credit is given
* to the University of California at Berkeley. The name of the University
* may not be used to endorse or promote products derived from this
* software without specific prior written permission. This software
* is provided ``as is'' without express or implied warranty.
*
* %W% (Berkeley) %G%
*/
#include "css.h"
#if NCSS > 0
/*
* DEC/CSS IMP11-A ARPAnet IMP interface driver.
* Since "imp11a" is such a mouthful, it is called
* "css" after the LH/DH being called "acc".
*
* Configuration notes:
*
* As delivered from DEC/CSS, it
* is addressed and vectored as two DR11-B's. This makes
* Autoconfig almost IMPOSSIBLE. To make it work, the
* interrupt vectors must be restrapped to make the vectors
* consecutive. The 020 hole between the CSR addresses is
* tolerated, althought that could be cleaned-up also.
*
* Additionally, the TRANSMIT side of the IMP11-A has the
* lower address of the two subunits, so the vector ordering
* in the CONFIG file is reversed from most other devices.
* It should be:
*
* device css0 .... cssxint cssrint
*
* If you get it wrong, it will still autoconfig, but will just
* sit there with RECEIVE IDLE indicated on the front panel.
*/
#include "param.h"
#include "systm.h"
#include "mbuf.h"
#include "buf.h"
#include "protosw.h"
#include "socket.h"
#include "vmmac.h"
#include "../machine/pte.h"
#include "../net/if.h"
#include "../netimp/if_imp.h"
#include "../vax/cpu.h"
#include "../vax/mtpr.h"
#include "if_cssreg.h"
#include "if_uba.h"
#include "../vaxuba/ubareg.h"
#include "../vaxuba/ubavar.h"
int cssprobe(), cssattach(), cssrint(), cssxint();
struct uba_device *cssinfo[NCSS];
u_short cssstd[] = { 0 };
struct uba_driver cssdriver =
{ cssprobe, 0, cssattach, 0, cssstd, "css", cssinfo };
int cssinit(), cssoutput(), cssdown(), cssreset();
/*
* "Lower half" of IMP interface driver.
*
* Each IMP interface is handled by a common module which handles
* the IMP-host protocol and a hardware driver which manages the
* hardware specific details of talking with the IMP.
*
* The hardware portion of the IMP driver handles DMA and related
* management of UNIBUS resources. The IMP protocol module interprets
* contents of these messages and "controls" the actions of the
* hardware module during IMP resets, but not, for instance, during
* UNIBUS resets.
*
* The two modules are coupled at "attach time", and ever after,
* through the imp interface structure. Higher level protocols,
* e.g. IP, interact with the IMP driver, rather than the CSS.
*/
struct css_softc {
struct imp_softc *css_imp; /* pointer to IMP's imp_softc struct */
struct ifuba css_ifuba; /* UNIBUS resources */
struct mbuf *css_iq; /* input reassembly queue */
short css_olen; /* size of last message sent */
char css_flush; /* flush remainder of message */
} css_softc[NCSS];
/*
* Reset the IMP and cause a transmitter interrupt by
* performing a null DMA.
*/
cssprobe(reg)
caddr_t reg;
{
register int br, cvec; /* r11, r10 value-result */
register struct cssdevice *addr = (struct cssdevice *)reg;
#ifdef lint
br = 0; cvec = br; br = cvec;
cssrint(0); cssxint(0);
#endif
addr->css_icsr = CSS_CLR;
addr->css_ocsr = CSS_CLR;
DELAY(50000);
addr->css_icsr = 0;
addr->css_ocsr = 0;
DELAY(50000);
addr->css_oba = 0;
addr->css_owc = -1;
addr->css_ocsr = CSS_IE | CSS_GO; /* enable interrupts */
DELAY(50000);
addr->css_ocsr = 0;
return (1);
}
/*
* Call the IMP module to allow it to set up its internal
* state, then tie the two modules together by setting up
* the back pointers to common data structures.
*/
cssattach(ui)
register struct uba_device *ui;
{
register struct css_softc *sc = &css_softc[ui->ui_unit];
register struct impcb *ip;
if ((sc->css_imp = impattach(ui->ui_driver->ud_dname, ui->ui_unit,
cssreset)) == 0)
return;
ip = &sc->css_imp->imp_cb;
ip->ic_init = cssinit;
ip->ic_output = cssoutput;
ip->ic_down = cssdown;
sc->css_ifuba.ifu_flags = UBA_CANTWAIT | UBA_NEED16;
#ifdef notdef
sc->css_ifuba.ifu_flags |= UBA_NEEDBDP;
#endif
}
/*
* Reset interface after UNIBUS reset.
* If interface is on specified uba, reset its state.
*/
cssreset(unit, uban)
int unit, uban;
{
register struct uba_device *ui;
register struct css_softc *sc;
if (unit >= NCSS || (ui = cssinfo[unit]) == 0 || ui->ui_alive == 0 ||
ui->ui_ubanum != uban)
return;
printf(" css%d", unit);
sc = &css_softc[unit];
sc->css_imp->imp_if.if_flags &= ~IFF_RUNNING;
/* must go through IMP to allow it to set state */
(*sc->css_imp->imp_if.if_init)(sc->css_imp->imp_if.if_unit);
}
/*
* Initialize interface: clear recorded pending operations,
* and retrieve, and reinitialize UNIBUS resources.
*/
cssinit(unit)
int unit;
{
register struct css_softc *sc;
register struct uba_device *ui;
register struct cssdevice *addr;
int x, info;
if (unit >= NCSS || (ui = cssinfo[unit]) == 0 || ui->ui_alive == 0) {
printf("css%d: not alive\n", unit);
return(0);
}
sc = &css_softc[unit];
/*
* Header length is 0 to if_ubainit since we have to pass
* the IMP leader up to the protocol interpretaion
* routines. If we had the deader length as
* sizeof(struct imp_leader), then the if_ routines
* would assume we handle it on input and output.
*/
if ((sc->css_imp->imp_if.if_flags & IFF_RUNNING) == 0 &&
if_ubainit(&sc->css_ifuba, ui->ui_ubanum, 0,
(int)btoc(IMP_RCVBUF)) == 0) {
printf("css%d: can't initialize\n", unit);
ui->ui_alive = 0;
sc->css_imp->imp_if.if_flags &= ~(IFF_UP | IFF_RUNNING);
return(0);
}
sc->css_imp->imp_if.if_flags |= IFF_RUNNING;
addr = (struct cssdevice *)ui->ui_addr;
/* reset the imp interface. */
x = spl5();
addr->css_icsr = CSS_CLR;
addr->css_ocsr = CSS_CLR;
DELAY(100);
addr->css_icsr = 0;
addr->css_ocsr = 0;
addr->css_icsr = IN_HRDY; /* close the relay */
DELAY(5000);
splx(x);
/*
* This may hang if the imp isn't really there.
* Will test and verify safe operation.
*/
x = 500;
while (x-- > 0) {
if ((addr->css_icsr & (IN_HRDY|IN_IMPNR)) == IN_HRDY)
break;
addr->css_icsr = IN_HRDY; /* close the relay */
DELAY(5000);
}
if (x <= 0) {
printf("css%d: imp doesn't respond, icsr=%b\n", unit,
CSS_INBITS, addr->css_icsr);
goto down;
}
/*
* Put up a read. We can't restart any outstanding writes
* until we're back in synch with the IMP (i.e. we've flushed
* the NOOPs it throws at us).
* Note: IMP_RCVBUF includes the leader.
*/
x = spl5();
info = sc->css_ifuba.ifu_r.ifrw_info;
addr->css_iba = (u_short)info;
addr->css_iwc = -(IMP_RCVBUF >> 1);
addr->css_icsr =
IN_HRDY | CSS_IE | IN_WEN | ((info & 0x30000) >> 12) | CSS_GO;
splx(x);
return(1);
down:
ui->ui_alive = 0;
return(0);
}
/*
* Drop the host ready line to mark host down.
* UNTESTED.
*/
cssdown(unit)
int unit;
{
register struct cssdevice *addr;
int x;
addr = (struct cssdevice *)(cssinfo[unit]->ui_addr);
/* reset the imp interface. */
x = spl5();
addr->css_icsr = CSS_CLR;
addr->css_ocsr = CSS_CLR;
DELAY(100);
addr->css_icsr = 0;
addr->css_ocsr = 0;
splx(x);
return (1);
}
/*
* Start output on an interface.
*/
cssoutput(unit, m)
int unit;
struct mbuf *m;
{
int info;
struct uba_device *ui = cssinfo[unit];
register struct css_softc *sc = &css_softc[unit];
register struct cssdevice *addr;
sc->css_olen = if_wubaput(&sc->css_ifuba, m);
/*
* Have request mapped to UNIBUS for transmission.
* Purge any stale data from the BDP, and start the output.
*/
if (sc->css_ifuba.ifu_flags & UBA_NEEDBDP)
UBAPURGE(sc->css_ifuba.ifu_uba, sc->css_ifuba.ifu_w.ifrw_bdp);
addr = (struct cssdevice *)ui->ui_addr;
info = sc->css_ifuba.ifu_w.ifrw_info;
addr->css_oba = (u_short)info;
addr->css_owc = -((sc->css_olen + 1) >> 1);
addr->css_ocsr =
(u_short)(CSS_IE | OUT_ENLB | ((info & 0x30000) >> 12) | CSS_GO);
sc->css_imp->imp_cb.ic_oactive = 1;
}
/*
* Output interrupt handler.
*/
cssxint(unit)
{
register struct uba_device *ui = cssinfo[unit];
register struct css_softc *sc = &css_softc[unit];
register struct cssdevice *addr;
addr = (struct cssdevice *)ui->ui_addr;
if (sc->css_imp->imp_cb.ic_oactive == 0) {
printf("css%d: stray output interrupt csr=%b\n",
unit, addr->css_ocsr, CSS_OUTBITS);
return;
}
sc->css_imp->imp_if.if_opackets++;
sc->css_imp->imp_cb.ic_oactive = 0;
if (addr->css_ocsr & CSS_ERR){
sc->css_imp->imp_if.if_oerrors++;
printf("css%d: output error, ocsr=%b icsr=%b\n", unit,
addr->css_ocsr, CSS_OUTBITS,
addr->css_icsr, CSS_INBITS);
}
if (sc->css_ifuba.ifu_xtofree) {
m_freem(sc->css_ifuba.ifu_xtofree);
sc->css_ifuba.ifu_xtofree = 0;
}
impstart(sc->css_imp);
}
/*
* Input interrupt handler
*/
cssrint(unit)
{
register struct css_softc *sc = &css_softc[unit];
register struct cssdevice *addr;
struct mbuf *m;
int len, info;
sc->css_imp->imp_if.if_ipackets++;
/*
* Purge BDP; flush message if error indicated.
*/
addr = (struct cssdevice *)cssinfo[unit]->ui_addr;
if (sc->css_ifuba.ifu_flags & UBA_NEEDBDP)
UBAPURGE(sc->css_ifuba.ifu_uba, sc->css_ifuba.ifu_r.ifrw_bdp);
if (addr->css_icsr & CSS_ERR) {
printf("css%d: recv error, csr=%b\n", unit,
addr->css_icsr, CSS_INBITS);
sc->css_imp->imp_if.if_ierrors++;
sc->css_flush = 1;
}
if (sc->css_flush) {
if (addr->css_icsr & IN_EOM)
sc->css_flush = 0;
goto setup;
}
len = IMP_RCVBUF + (addr->css_iwc << 1);
if (len < 0 || len > IMP_RCVBUF) {
printf("css%d: bad length=%d\n", len);
sc->css_imp->imp_if.if_ierrors++;
goto setup;
}
/*
* The offset parameter is always 0 since using
* trailers on the ARPAnet is insane.
*/
m = if_rubaget(&sc->css_ifuba, len, 0, &sc->css_imp->imp_if);
if (m == 0)
goto setup;
if ((addr->css_icsr & IN_EOM) == 0) {
if (sc->css_iq)
m_cat(sc->css_iq, m);
else
sc->css_iq = m;
goto setup;
}
if (sc->css_iq) {
m_cat(sc->css_iq, m);
m = sc->css_iq;
sc->css_iq = 0;
}
impinput(unit, m);
setup:
/*
* Setup for next message.
*/
info = sc->css_ifuba.ifu_r.ifrw_info;
addr->css_iba = (u_short)info;
addr->css_iwc = - (IMP_RCVBUF >> 1);
addr->css_icsr =
IN_HRDY | CSS_IE | IN_WEN | ((info & 0x30000) >> 12) | CSS_GO;
}
#endif