148 lines
2.9 KiB
C
148 lines
2.9 KiB
C
/* $NetBSD: ast.c,v 1.12 1994/11/18 22:07:32 mycroft Exp $ */
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/*
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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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#include <sys/param.h>
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#include <sys/device.h>
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#include <machine/pio.h>
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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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struct intrhand sc_ih;
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int sc_iobase;
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int sc_alive; /* mask of slave units attached */
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void *sc_slaves[4]; /* com device unit numbers */
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};
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int astprobe();
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void astattach();
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int astintr __P((struct ast_softc *));
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struct cfdriver astcd = {
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NULL, "ast", astprobe, astattach, DV_TTY, sizeof(struct ast_softc), 1
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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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ia->ia_iosize = 4 * 8;
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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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int aa_slave;
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};
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int
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astsubmatch(parent, match, aux)
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struct device *parent;
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void *match, *aux;
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{
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struct ast_softc *sc = (void *)parent;
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struct device *self = match;
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struct isa_attach_args *ia = aux;
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struct ast_attach_args *aa = ia->ia_aux;
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struct cfdata *cf = self->dv_cfdata;
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if (cf->cf_loc[0] != -1 && cf->cf_loc[0] != aa->aa_slave)
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return (0);
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return ((*cf->cf_driver->cd_match)(parent, match, ia));
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}
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int
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astprint(aux, ast)
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void *aux;
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char *ast;
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{
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struct isa_attach_args *ia = aux;
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struct ast_attach_args *aa = ia->ia_aux;
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printf(" slave %d", aa->aa_slave);
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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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struct isa_attach_args isa;
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sc->sc_iobase = ia->ia_iobase;
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/*
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* Enable the master interrupt.
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*/
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outb(sc->sc_iobase | 0x1f, 0x80);
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printf("\n");
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isa.ia_aux = &aa;
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for (aa.aa_slave = 0; aa.aa_slave < 4; aa.aa_slave++) {
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void *match;
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isa.ia_iobase = sc->sc_iobase + 8 * aa.aa_slave;
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isa.ia_iosize = 0x666;
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isa.ia_irq = IRQUNK;
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isa.ia_drq = DRQUNK;
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isa.ia_msize = 0;
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if ((match = config_search(astsubmatch, self, &isa)) != 0) {
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sc->sc_slaves[aa.aa_slave] = match;
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sc->sc_alive |= 1 << aa.aa_slave;
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config_attach(self, match, &isa, astprint);
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}
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}
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sc->sc_ih.ih_fun = astintr;
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sc->sc_ih.ih_arg = sc;
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sc->sc_ih.ih_level = IPL_TTY;
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intr_establish(ia->ia_irq, &sc->sc_ih);
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}
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int
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astintr(sc)
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struct ast_softc *sc;
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{
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int 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 == 0)
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return (0);
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for (;;) {
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#define TRY(n) \
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if (bits & (1 << (n))) \
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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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if (bits == 0)
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return (1);
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}
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}
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