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add AST-style serial multiport support, from Roland McGrath 

<roland@frob.com>.  Needs light clean by Mr. I386, but mostly
OK.
This commit is contained in:
cgd 1994-03-23 01:25:53 +00:00
parent aa67092685
commit c24c16f35f
3 changed files with 184 additions and 1 deletions
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7
sys/arch/i386/conf/BOAT_ANCHOR
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@ -1,7 +1,7 @@
#
# BOAT_ANCHOR -- kernel for the 386-20 the gang uses for testing
#
# $Id: BOAT_ANCHOR,v 1.29 1994/03/09 21:22:33 ws Exp $
# $Id: BOAT_ANCHOR,v 1.30 1994/03/23 01:25:53 cgd Exp $
#
machine "i386"
cpu "I386_CPU"
@ -37,6 +37,11 @@ device pc0 at isa? port "IO_KBD" tty irq 1 vector pcrint
device npx0 at isa? port "IO_NPX" irq 13 vector npxintr
device com0 at isa? port "IO_COM1" tty irq 4 vector comintr
master ast0 at isa? port 0x1a0 tty irq 3 vector astintr
device com1 at ast0 slave 0
device com2 at ast0 slave 1
device com3 at ast0 slave 2
device com4 at ast0 slave 3
device ed0 at isa? port 0x280 net irq 9 iomem 0xd0000 vector edintr

89
sys/arch/i386/isa/ast.c Normal file
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@ -0,0 +1,89 @@
/*
* Multi-port serial card interrupt demuxing support.
* Roland McGrath 3/20/94
*
* $Id: ast.c,v 1.1 1994/03/23 01:26:14 cgd Exp $
*/
#include "ast.h"
#include <sys/types.h>
#include <machine/pio.h>
#include <i386/isa/isa_device.h>
int astprobe __P((struct isa_device *));
int astattach __P((struct isa_device *));
struct isa_driver astdriver = {
astprobe, astattach, "ast"
};
struct astunit /* XXX ast_softc? */
{
u_short iobase;
int alive; /* Mask of slave units attached. */
int slaveunits[8]; /* com device unit numbers. XXX - softc ptrs */
} astunits[NAST];
int
astprobe(struct isa_device *isa_dev)
{
/*
* Do the normal com probe for the first UART and assume
* its presence means there is a multiport board there.
* XXX needs more robustness.
*/
return comprobe1(isa_dev->id_iobase);
}
int
astattach(struct isa_device *isa_dev)
{
int unit = isa_dev->id_unit;
u_short iobase = isa_dev->id_iobase;
unsigned int x;
astunits[unit].iobase = iobase;
/*
* XXX calculation of master address is a bit hazy --
* what if > 4 ports, etc.
*/
outb (iobase | 0x1f, 0x80);
x = inb (iobase | 0x1f);
/*
* My guess is this bitmask tells you how many ports are there.
* I only have a 4-port board to try (returns 0xf). --roland
*/
printf ("ast%d: 0x%x\n", unit, x);
}
void
astslave(struct isa_device *slave, int comunit)
{
struct astunit *a = &astunits[slave->id_parent->id_unit];
a->slaveunits[slave->id_physid] = comunit;
a->alive |= 1 << slave->id_physid;
}
int
astintr(int unit)
{
struct astunit *a = &astunits[unit];
u_short iobase = a->iobase;
int alive = a->alive;
int bits;
do {
bits = inb (iobase | 0x1f) & alive;
#define TRY(I) ((bits & (1 << (I))) ? 0 : comintr (a->slaveunits[I]))
TRY (0), TRY (1), TRY (2), TRY (3);
/* XXX -- i think the next 4 are bogus, see above -- cgd */
TRY (4), TRY (5), TRY (6), TRY (7);
#undef TRY
} while (bits != alive);
return 1;
}

89
sys/dev/isa/ast.c Normal file
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@ -0,0 +1,89 @@
/*
* Multi-port serial card interrupt demuxing support.
* Roland McGrath 3/20/94
*
* $Id: ast.c,v 1.1 1994/03/23 01:26:14 cgd Exp $
*/
#include "ast.h"
#include <sys/types.h>
#include <machine/pio.h>
#include <i386/isa/isa_device.h>
int astprobe __P((struct isa_device *));
int astattach __P((struct isa_device *));
struct isa_driver astdriver = {
astprobe, astattach, "ast"
};
struct astunit /* XXX ast_softc? */
{
u_short iobase;
int alive; /* Mask of slave units attached. */
int slaveunits[8]; /* com device unit numbers. XXX - softc ptrs */
} astunits[NAST];
int
astprobe(struct isa_device *isa_dev)
{
/*
* Do the normal com probe for the first UART and assume
* its presence means there is a multiport board there.
* XXX needs more robustness.
*/
return comprobe1(isa_dev->id_iobase);
}
int
astattach(struct isa_device *isa_dev)
{
int unit = isa_dev->id_unit;
u_short iobase = isa_dev->id_iobase;
unsigned int x;
astunits[unit].iobase = iobase;
/*
* XXX calculation of master address is a bit hazy --
* what if > 4 ports, etc.
*/
outb (iobase | 0x1f, 0x80);
x = inb (iobase | 0x1f);
/*
* My guess is this bitmask tells you how many ports are there.
* I only have a 4-port board to try (returns 0xf). --roland
*/
printf ("ast%d: 0x%x\n", unit, x);
}
void
astslave(struct isa_device *slave, int comunit)
{
struct astunit *a = &astunits[slave->id_parent->id_unit];
a->slaveunits[slave->id_physid] = comunit;
a->alive |= 1 << slave->id_physid;
}
int
astintr(int unit)
{
struct astunit *a = &astunits[unit];
u_short iobase = a->iobase;
int alive = a->alive;
int bits;
do {
bits = inb (iobase | 0x1f) & alive;
#define TRY(I) ((bits & (1 << (I))) ? 0 : comintr (a->slaveunits[I]))
TRY (0), TRY (1), TRY (2), TRY (3);
/* XXX -- i think the next 4 are bogus, see above -- cgd */
TRY (4), TRY (5), TRY (6), TRY (7);
#undef TRY
} while (bits != alive);
return 1;
}