90 lines
1.9 KiB
C
90 lines
1.9 KiB
C
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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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*
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* $Id: ast.c,v 1.1 1994/03/23 01:26:14 cgd 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 <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 astunit /* XXX ast_softc? */
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{
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u_short iobase;
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int alive; /* Mask of slave units attached. */
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int slaveunits[8]; /* com device unit numbers. XXX - softc ptrs */
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} astunits[NAST];
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int
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astprobe(struct isa_device *isa_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(isa_dev->id_iobase);
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}
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int
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astattach(struct isa_device *isa_dev)
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{
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int unit = isa_dev->id_unit;
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u_short iobase = isa_dev->id_iobase;
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unsigned int x;
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astunits[unit].iobase = iobase;
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/*
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* XXX calculation of master address is a bit hazy --
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* what if > 4 ports, etc.
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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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printf ("ast%d: 0x%x\n", unit, x);
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}
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void
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astslave(struct isa_device *slave, int comunit)
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{
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struct astunit *a = &astunits[slave->id_parent->id_unit];
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a->slaveunits[slave->id_physid] = comunit;
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a->alive |= 1 << slave->id_physid;
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}
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int
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astintr(int unit)
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{
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struct astunit *a = &astunits[unit];
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u_short iobase = a->iobase;
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int alive = a->alive;
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int bits;
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do {
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bits = inb (iobase | 0x1f) & alive;
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#define TRY(I) ((bits & (1 << (I))) ? 0 : comintr (a->slaveunits[I]))
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TRY (0), TRY (1), TRY (2), TRY (3);
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/* XXX -- i think the next 4 are bogus, see above -- cgd */
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TRY (4), TRY (5), TRY (6), TRY (7);
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#undef TRY
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} while (bits != alive);
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return 1;
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}
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