153 lines
3.0 KiB
C
153 lines
3.0 KiB
C
/*
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* Multi-port serial card interrupt demuxing support.
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* Roland McGrath 3/20/94
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* The author disclaims copyright and places this file in the public domain.
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*
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* Modified by: Charles Hannum, 3/22/94
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*
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* $Id: ast.c,v 1.5 1994/03/29 04:35:37 mycroft Exp $
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*/
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#include <sys/param.h>
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#include <sys/device.h>
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#include <machine/pio.h>
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#ifndef NEWCONFIG
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#include <i386/isa/isa_device.h>
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#endif
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#include <i386/isa/isavar.h>
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struct ast_softc {
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struct device sc_dev;
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u_short sc_iobase;
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int sc_alive; /* mask of slave units attached */
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int sc_slaves[8]; /* com device unit numbers */
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};
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int astprobe();
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void astattach();
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struct cfdriver astcd = {
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NULL, "ast", astprobe, astattach, DV_TTY, sizeof(struct ast_softc)
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};
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int
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astprobe(parent, self, aux)
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struct device *parent, *self;
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void *aux;
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{
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struct isa_attach_args *ia = aux;
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/*
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* Do the normal com probe for the first UART and assume
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* its presence means there is a multiport board there.
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* XXX Needs more robustness.
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*/
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return comprobe1(ia->ia_iobase);
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}
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struct ast_attach_args {
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u_short aa_iobase;
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int aa_slave;
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};
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int
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astsubmatch(parent, self, aux)
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struct device *parent, *self;
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void *aux;
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{
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struct ast_softc *sc = (void *)parent;
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struct ast_attach_args *aa = aux;
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struct cfdata *cf = self->dv_cfdata;
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int found, frobbed = 0;
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#ifdef NEWCONFIG
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#define cf_slave cf_loc[6]
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if (cf->cf_slave != -1 && cf->cf_slave != aa->aa_slave)
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return 0;
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if (cf->cf_iobase == IOBASEUNK) {
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frobbed = 1;
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cf->cf_iobase = aa->aa_iobase;
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}
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#undef cf_slave
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#else
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struct isa_device *id = (void *)cf->cf_loc;
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if (id->id_physid != -1 && id->id_physid != aa->aa_slave)
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return 0;
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if (id->id_iobase == 0) {
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frobbed = 1;
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id->id_iobase = aa->aa_iobase;
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}
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#endif
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found = isasubmatch(parent, self, aux);
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if (found) {
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sc->sc_slaves[aa->aa_slave] = cf->cf_unit;
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sc->sc_alive |= 1 << aa->aa_slave;
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}
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/*
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* If we changed the iobase, we have to set it back now, because it
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* might be a clone device, and the iobase wouldn't get set properly on
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* the next iteration.
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*/
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#ifdef NEWCONFIG
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if (frobbed)
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cf->cf_iobase = IOBASEUNK;
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#else
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if (frobbed)
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id->id_iobase = 0;
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#endif
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return found;
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}
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void
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astattach(parent, self, aux)
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struct device *parent, *self;
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void *aux;
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{
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struct ast_softc *sc = (void *)self;
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struct isa_attach_args *ia = aux;
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struct ast_attach_args aa;
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/*
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* Enable the master interrupt.
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*/
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sc->sc_iobase = ia->ia_iobase;
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outb(sc->sc_iobase | 0x1f, 0x80);
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printf("\n");
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for (aa.aa_slave = 0, aa.aa_iobase = sc->sc_iobase;
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aa.aa_slave < 4;
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aa.aa_slave++, aa.aa_iobase += 8)
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config_search(astsubmatch, self, &aa);
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}
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int
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astintr(unit)
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int unit;
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{
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struct ast_softc *sc = astcd.cd_devs[unit];
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u_short iobase = sc->sc_iobase;
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int alive = sc->sc_alive;
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int bits;
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bits = inb(iobase | 0x1f) & alive;
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if (bits == alive)
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return 0;
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do {
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#define TRY(n) \
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if ((bits & (1 << (n))) == 0) \
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comintr(sc->sc_slaves[n]);
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TRY(0);
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TRY(1);
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TRY(2);
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TRY(3);
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#undef TRY
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bits = inb(iobase | 0x1f) & alive;
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} while (bits != alive);
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return 1;
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}
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