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Map port 0x84 (which is used to generate a 2.6us delay) in isaattach(). 

Since this port is needed by at least a few drivers, export its i/o handle
via isa_attach_args.
This commit is contained in:
thorpej 1996-05-05 01:14:07 +00:00
parent 0808320ac1
commit 6fb58044fd
2 changed files with 20 additions and 2 deletions
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10
sys/dev/isa/isa.c
View File

@ -1,4 +1,4 @@
/* $NetBSD: isa.c,v 1.81 1996/04/29 20:03:24 christos Exp $ */
/* $NetBSD: isa.c,v 1.82 1996/05/05 01:14:07 thorpej Exp $ */
/*-
* Copyright (c) 1993, 1994 Charles Hannum. All rights reserved.
@ -84,6 +84,13 @@ isaattach(parent, self, aux)
sc->sc_bc = iba->iba_bc;
sc->sc_ic = iba->iba_ic;
/*
* Map port 0x84, which causes a 2.5us delay when read.
* We do this now, since several drivers need it.
*/
if (bus_io_map(sc->sc_bc, 0x84, 1, &sc->sc_delayioh))
panic("isaattach: can't map `delay port'"); /* XXX */
TAILQ_INIT(&sc->sc_subdevs);
config_scan(isascan, self);
}
@ -131,6 +138,7 @@ isascan(parent, match)
ia.ia_msize = cf->cf_loc[3];
ia.ia_irq = cf->cf_loc[4] == 2 ? 9 : cf->cf_loc[4];
ia.ia_drq = cf->cf_loc[5];
ia.ia_delayioh = sc->sc_delayioh;
if ((*cf->cf_attach->ca_match)(parent, dev, &ia) > 0)
config_attach(parent, dev, &ia, isaprint);

12
sys/dev/isa/isavar.h
View File

@ -1,4 +1,4 @@
/* $NetBSD: isavar.h,v 1.21 1996/04/11 22:20:50 cgd Exp $ */
/* $NetBSD: isavar.h,v 1.22 1996/05/05 01:14:14 thorpej Exp $ */
/*
* Copyright (c) 1995 Chris G. Demetriou
@ -84,6 +84,8 @@ struct isa_attach_args {
int ia_maddr; /* physical i/o mem addr */
u_int ia_msize; /* size of i/o memory */
void *ia_aux; /* driver specific */
bus_io_handle_t ia_delayioh; /* i/o handle for `delay port' */
};
#define IOBASEUNK -1 /* i/o address is unknown */
@ -110,6 +112,14 @@ struct isa_softc {
bus_chipset_tag_t sc_bc;
isa_chipset_tag_t sc_ic;
/*
* This i/o handle is used to map port 0x84, which is
* read to provide a 2.5us delay. This i/o handle
* is mapped in isaattach(), and exported to drivers
* via isa_attach_args.
*/
bus_io_handle_t sc_delayioh;
};
#define cf_iobase cf_loc[0]