+/* if_css.c 4.1 82/07/20 */
+
+#include "css.h"
+
+/*
+ * 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 "../h/param.h"
+#include "../h/systm.h"
+#include "../h/mbuf.h"
+#include "../h/pte.h"
+#include "../h/buf.h"
+#include "../h/protosw.h"
+#include "../h/socket.h"
+#include "../h/ubareg.h"
+#include "../h/ubavar.h"
+#include "../h/cpu.h"
+#include "../h/mtpr.h"
+#include "../h/vmmac.h"
+#include "../net/if_css.h"
+#include "../net/in.h"
+#include "../net/in_systm.h"
+#include "../net/if.h"
+#include "../net/if_imp.h"
+#include "../net/if_uba.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 };
+#define CSSUNIT(x) minor(x)
+
+int cssinit(), cssstart(), 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 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;
+{
+ register int br, cvec; /* r11, r10 value-result */
+ register struct cssdevice *addr = (struct cssdevice *)reg;
+
+COUNT(CSSPROBE);
+#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)
+ 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;
+
+COUNT(CSSATTACH);
+ if ((ifimp = (struct ifimpcb *)impattach(ui)) == 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;
+
+COUNT(CSSCLR);
+ 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, info;
+
+COUNT(CSSINIT);
+ 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 = 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: IMPMTU includes the leader.
+ */
+
+ x = spl5();
+ 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), 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;
+
+COUNT(CSSSTART);
+ 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:
+ /*
+ * 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);
+ 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;
+
+COUNT(CSSXINT);
+ 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);
+ return;
+ }
+ 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);
+}
+
+/*
+ * 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, info;
+
+COUNT(CSSRINT);
+ sc->css_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_if->if_ierrors++;
+ sc->css_flush = 1;
+ }
+
+ 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 last parameter is always 0 since using
+ * trailers on the ARPAnet is insane.
+ */
+ m = if_rubaget(&sc->css_ifuba, len, 0);
+ 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;
+}
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