144 lines
3.8 KiB
C
144 lines
3.8 KiB
C
/* $NetBSD: mcclock_isa.c,v 1.8 2006/09/05 01:33:24 gdamore Exp $ */
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/*
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* Copyright (c) 1995, 1996 Carnegie-Mellon University.
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* All rights reserved.
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*
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* Author: Chris G. Demetriou
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*
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* Permission to use, copy, modify and distribute this software and
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* its documentation is hereby granted, provided that both the copyright
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* notice and this permission notice appear in all copies of the
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* software, derivative works or modified versions, and any portions
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* thereof, and that both notices appear in supporting documentation.
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*
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* CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
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* CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND
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* FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
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*
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* Carnegie Mellon requests users of this software to return to
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*
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* Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU
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* School of Computer Science
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* Carnegie Mellon University
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* Pittsburgh PA 15213-3890
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*
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* any improvements or extensions that they make and grant Carnegie the
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* rights to redistribute these changes.
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*/
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#include <sys/cdefs.h> /* RCS ID & Copyright macro defns */
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__KERNEL_RCSID(0, "$NetBSD: mcclock_isa.c,v 1.8 2006/09/05 01:33:24 gdamore Exp $");
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#include <sys/param.h>
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#include <sys/kernel.h>
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#include <sys/systm.h>
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#include <sys/device.h>
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#include <machine/bus.h>
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#include <dev/clock_subr.h>
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#include <dev/ic/mc146818reg.h>
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#include <dev/ic/mc146818var.h>
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#include <dev/isa/isavar.h>
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int mcclock_isa_match(struct device *, struct cfdata *, void *);
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void mcclock_isa_attach(struct device *, struct device *, void *);
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CFATTACH_DECL(mcclock_isa, sizeof(struct mc146818_softc),
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mcclock_isa_match, mcclock_isa_attach, NULL, NULL);
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void mcclock_isa_write(struct mc146818_softc *, u_int, u_int);
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u_int mcclock_isa_read(struct mc146818_softc *, u_int);
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int
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mcclock_isa_match(struct device *parent, struct cfdata *match, void *aux)
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{
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struct isa_attach_args *ia = aux;
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bus_space_handle_t ioh;
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if (ia->ia_nio < 1 ||
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(ia->ia_io[0].ir_addr != ISA_UNKNOWN_PORT &&
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ia->ia_io[0].ir_addr != 0x70))
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return (0);
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if (ia->ia_niomem > 0 &&
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(ia->ia_iomem[0].ir_addr != ISA_UNKNOWN_IOMEM))
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return (0);
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if (ia->ia_nirq > 0 &&
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(ia->ia_irq[0].ir_irq != ISA_UNKNOWN_IRQ))
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return (0);
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if (ia->ia_ndrq > 0 &&
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(ia->ia_drq[0].ir_drq != ISA_UNKNOWN_DRQ))
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return (0);
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if (bus_space_map(ia->ia_iot, 0x70, 0x2, 0, &ioh))
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return (0);
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bus_space_unmap(ia->ia_iot, ioh, 0x2);
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ia->ia_nio = 1;
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ia->ia_io[0].ir_addr = 0x70;
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ia->ia_io[0].ir_size = 0x02;
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ia->ia_niomem = 0;
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ia->ia_nirq = 0;
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ia->ia_ndrq = 0;
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return (1);
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}
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void
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mcclock_isa_attach(struct device *parent, struct device *self, void *aux)
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{
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struct isa_attach_args *ia = aux;
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struct mc146818_softc *sc = (struct mc146818_softc *)self;
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sc->sc_bst = ia->ia_iot;
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if (bus_space_map(sc->sc_bst, ia->ia_io[0].ir_addr,
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ia->ia_io[0].ir_size, 0, &sc->sc_bsh))
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panic("mcclock_isa_attach: couldn't map clock I/O space");
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/*
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* Turn interrupts off, just in case. Need to leave the SQWE
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* set, because that's the DRAM refresh signal on Rev. B boards.
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*/
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mcclock_isa_write(sc, MC_REGB, MC_REGB_SQWE | MC_REGB_BINARY |
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MC_REGB_24HR);
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sc->sc_mcread = mcclock_isa_read;
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sc->sc_mcwrite = mcclock_isa_write;
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sc->sc_getcent = NULL;
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sc->sc_setcent = NULL;
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sc->sc_flag = 0;
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/* Algor uses year 1980 as offset */
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sc->sc_year0 = 80;
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mc146818_attach(sc);
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}
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void
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mcclock_isa_write(struct mc146818_softc *sc, u_int reg, u_int datum)
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{
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bus_space_tag_t iot = sc->sc_bst;
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bus_space_handle_t ioh = sc->sc_bsh;
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bus_space_write_1(iot, ioh, 0, reg);
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bus_space_write_1(iot, ioh, 1, datum);
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}
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u_int
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mcclock_isa_read(struct mc146818_softc *sc, u_int reg)
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{
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bus_space_tag_t iot = sc->sc_bst;
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bus_space_handle_t ioh = sc->sc_bsh;
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bus_space_write_1(iot, ioh, 0, reg);
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return bus_space_read_1(iot, ioh, 1);
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}
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