2.11BSD/sys/pdpif/if_css.c
/*
* Copyright (c) 1986 Regents of the University of California.
* All rights reserved. The Berkeley software License Agreement
* specifies the terms and conditions for redistribution.
*
* @(#)if_css.c 1.2 (2.11BSD) 1997/1/18
*/
#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 RECIEVE IDLE indicated on the front panel.
*/
#include "param.h"
#include "../machine/seg.h"
#include "systm.h"
#include "mbuf.h"
#include "buf.h"
#include "domain.h"
#include "protosw.h"
#include "socket.h"
#include "pdpuba/ubavar.h"
#include "../net/if.h"
#include "../netinet/in.h"
#include "../netinet/in_systm.h"
#include "../netimp/if_imp.h"
#include "if_css.h"
#include "if_uba.h"
int cssprobe(), cssattach(), cssrint(), cssxint();
int cssinit(), cssstart(), cssreset();
struct uba_device *cssinfo[NCSS];
u_short cssstd[] = { 0 };
struct uba_driver cssdriver =
{ cssprobe, 0, cssattach, 0, cssstd, "css", cssinfo };
#define CSSUNIT(x) minor(x)
/*
* "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 ifnet *css_if; /* pointer to IMP's ifnet struct */
struct impcb *css_ic; /* data structure shared with IMP */
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;
{
#if !pdp11
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(50000L);
addr->css_icsr = 0;
addr->css_ocsr = 0;
DELAY(50000L);
addr->css_oba = 0;
addr->css_owc = -1;
addr->css_ocsr = CSS_IE | CSS_GO; /* enable interrupts */
DELAY(50000L);
addr->css_ocsr = 0;
return (1);
#endif !pdp11
}
/*
* 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)
struct uba_device *ui;
{
register struct css_softc *sc = &css_softc[ui->ui_unit];
register struct impcb *ip;
struct ifimpcb {
struct ifnet ifimp_if;
struct impcb ifimp_impcb;
} *ifimp;
if ((ifimp = (struct ifimpcb *)impattach(ui, cssreset)) == 0)
panic("cssattach"); /* XXX */
sc->css_if = &ifimp->ifimp_if;
ip = &ifimp->ifimp_impcb;
sc->css_ic = ip;
ip->ic_init = cssinit;
ip->ic_start = cssstart;
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;
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];
/* must go through IMP to allow it to set state */
(*sc->css_if->if_init)(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;
long 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 (if_ubainit(&sc->css_ifuba, ui->ui_ubanum, 0,(int)btoc(IMPMTU)) == 0) {
printf("css%d: can't initialize\n", unit);
ui->ui_alive = 0;
return(0);
}
addr = (struct cssdevice *)ui->ui_addr;
/* reset the imp interface. */
x = splimp();
addr->css_icsr = CSS_CLR;
addr->css_ocsr = CSS_CLR;
DELAY(100L);
addr->css_icsr = 0;
addr->css_ocsr = 0;
addr->css_icsr = IN_HRDY; /* close the relay */
DELAY(5000L);
splx(x);
/*
* This may hang if the imp isn't really there.
* Will test and verify safe operation.
*/
x = 5;
while (x-- > 0) {
if ((addr->css_icsr & (IN_HRDY|IN_IMPNR)) == IN_HRDY)
break;
addr->css_icsr = IN_HRDY; /* close the relay */
DELAY(5000L);
}
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: IMPMTU includes the leader.
*/
x = splimp();
info = sc->css_ifuba.ifu_r.ifrw_info;
addr->css_iba = (u_short)info;
addr->css_iwc = -(IMPMTU >> 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);
}
/*
* Start output on an interface.
*/
cssstart(dev)
dev_t dev;
{
int unit = CSSUNIT(dev);
long info;
struct uba_device *ui = cssinfo[unit];
register struct css_softc *sc = &css_softc[unit];
register struct cssdevice *addr;
struct mbuf *m;
u_short cmd;
if (sc->css_ic->ic_oactive)
goto restart;
/*
* Not already active, deqeue a request and
* map it onto the UNIBUS. If no more
* requeusts, just return.
*/
IF_DEQUEUE(&sc->css_if->if_snd, m);
if (m == 0) {
sc->css_ic->ic_oactive = 0;
return;
}
sc->css_olen = if_wubaput(&sc->css_ifuba, m);
restart:
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);
cmd = CSS_IE | OUT_ENLB | ((info & 0x30000) >> 12) | CSS_GO;
addr->css_ocsr = cmd;
sc->css_ic->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_ic->ic_oactive == 0) {
printf("css%d: stray output interrupt csr=%b\n",
unit, addr->css_ocsr, CSS_OUTBITS);
goto out;
}
sc->css_if->if_opackets++;
sc->css_ic->ic_oactive = 0;
if (addr->css_ocsr & CSS_ERR){
sc->css_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;
}
if (sc->css_if->if_snd.ifq_head)
cssstart(unit);
out:
return;
}
/*
* Input interrupt handler
*/
cssrint(unit)
{
register struct css_softc *sc = &css_softc[unit];
register struct cssdevice *addr;
register struct ifqueue *inq;
struct mbuf *m;
int len;
long info;
sc->css_if->if_ipackets++;
addr = (struct cssdevice *)cssinfo[unit]->ui_addr;
if (addr->css_icsr & CSS_ERR) {
printf("css%d: recv error, csr=%b\n", unit,
addr->css_icsr, CSS_INBITS);
sc->css_if->if_ierrors++;
sc->css_flush = 1;
if (addr->css_icsr & IN_IMPNR) {
impinput(unit,(struct mbuf *)0);
goto out;
}
}
if (sc->css_flush) {
if (addr->css_icsr & IN_EOM)
sc->css_flush = 0;
goto setup;
}
len = IMPMTU + (addr->css_iwc << 1);
if (len < 0 || len > IMPMTU) {
printf("css%d: bad length=%d\n", len);
sc->css_if->if_ierrors++;
goto setup;
}
/*
* The next to last parameter is always 0 since using
* trailers on the ARPAnet is insane.
*/
m = if_rubaget(&sc->css_ifuba, len, 0, &sc->css_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 = - (IMPMTU >> 1);
addr->css_icsr =
IN_HRDY | CSS_IE | IN_WEN | ((info & 0x30000) >> 12) | CSS_GO;
out:
return;
}
#endif NCSS