114 lines
2.3 KiB
C
114 lines
2.3 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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* Charles Hannum 3/22/94
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*
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* $Id: ast.c,v 1.2 1994/03/23 03:01:50 mycroft Exp $
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*/
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#include "ast.h"
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#include <sys/types.h>
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#include <sys/device.h>
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#include <machine/pio.h>
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#include <i386/isa/isa_device.h>
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int astprobe __P((struct isa_device *));
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int astattach __P((struct isa_device *));
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struct isa_driver astdriver = {
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astprobe, astattach, "ast"
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};
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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. XXX - softc ptrs */
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} ast_softc[NAST];
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int
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astprobe(dev)
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struct isa_device *dev;
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{
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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(dev->id_iobase);
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}
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int
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astattach(dev)
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struct isa_device *dev;
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{
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struct ast_softc *sc = &ast_softc[dev->id_unit];
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u_short iobase = dev->id_iobase;
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unsigned int x;
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/* XXX HACK */
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sprintf(sc->sc_dev.dv_xname, "%s%d", astdriver.name, dev->id_unit);
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sc->sc_dev.dv_unit = dev->id_unit;
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sc->sc_iobase = iobase;
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/*
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* Enable the master interrupt.
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*/
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outb(iobase | 0x1f, 0x80);
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x = inb(iobase | 0x1f);
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/*
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* My guess is this bitmask tells you how many ports are there.
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* I only have a 4-port board to try (returns 0xf). --roland
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*
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* It's also not clear that it would be correct to rely on this, since
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* there might be an interrupt pending on one of the ports, and thus
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* its bit wouldn't be set. - mycroft
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*/
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printf("%s: 0x%x\n", sc->sc_dev.dv_xname, x);
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}
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void
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astslave(dev)
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struct isa_device *dev;
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{
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struct ast_softc *sc = &ast_softc[dev->id_parent->id_unit];
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sc->sc_slaves[dev->id_physid] = dev->id_unit;
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sc->sc_alive |= 1 << dev->id_physid;
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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 = &ast_softc[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]); /* XXX softc ptr */
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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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TRY(4);
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TRY(5);
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TRY(6);
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TRY(7);
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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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