sys/arch/alpha/isa/mcclock_isa.c

   1 /* $NetBSD: mcclock_isa.c,v 1.18 2008/03/28 19:05:49 tsutsui Exp $ */
   2
   3 /*
   4  * Copyright (c) 1995, 1996 Carnegie-Mellon University.
   5  * All rights reserved.
   6  *
   7  * Author: Chris G. Demetriou
   8  *
   9  * Permission to use, copy, modify and distribute this software and
  10  * its documentation is hereby granted, provided that both the copyright
  11  * notice and this permission notice appear in all copies of the
  12  * software, derivative works or modified versions, and any portions
  13  * thereof, and that both notices appear in supporting documentation.
  14  *
  15  * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
  16  * CONDITION.  CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND
  17  * FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
  18  *
  19  * Carnegie Mellon requests users of this software to return to
  20  *
  21  *  Software Distribution Coordinator  or  Software.Distribution@CS.CMU.EDU
  22  *  School of Computer Science
  23  *  Carnegie Mellon University
  24  *  Pittsburgh PA 15213-3890
  25  *
  26  * any improvements or extensions that they make and grant Carnegie the
  27  * rights to redistribute these changes.
  28  */
  29
  30 #include <sys/cdefs.h>                  /* RCS ID & Copyright macro defns */
  31
  32 __KERNEL_RCSID(0, "$NetBSD: mcclock_isa.c,v 1.18 2008/03/28 19:05:49 tsutsui Exp $");
  33
  34 #include <sys/param.h>
  35 #include <sys/kernel.h>
  36 #include <sys/systm.h>
  37 #include <sys/device.h>
  38
  39 #include <machine/bus.h>
  40
  41 #include <dev/clock_subr.h>
  42
  43 #include <dev/ic/mc146818reg.h>
  44 #include <dev/ic/mc146818var.h>
  45 #include <dev/isa/isavar.h>
  46
  47 #include <alpha/alpha/mcclockvar.h>
  48
  49 int     mcclock_isa_match(device_t, cfdata_t, void *);
  50 void    mcclock_isa_attach(device_t, device_t, void *);
  51
  52 CFATTACH_DECL_NEW(mcclock_isa, sizeof(struct mc146818_softc),
  53     mcclock_isa_match, mcclock_isa_attach, NULL, NULL);
  54
  55 void    mcclock_isa_write(struct mc146818_softc *, u_int, u_int);
  56 u_int   mcclock_isa_read(struct mc146818_softc *, u_int);
  57
  58 int
  59 mcclock_isa_match(device_t parent, cfdata_t cf, void *aux)
  60 {
  61         struct isa_attach_args *ia = aux;
  62         bus_space_handle_t ioh;
  63
  64         if (ia->ia_nio < 1 ||
  65             (ia->ia_io[0].ir_addr != ISA_UNKNOWN_PORT &&
  66              ia->ia_io[0].ir_addr != 0x70))
  67                 return (0);
  68
  69         if (ia->ia_niomem > 0 &&
  70             (ia->ia_iomem[0].ir_addr != ISA_UNKNOWN_IOMEM))
  71                 return (0);
  72
  73         if (ia->ia_nirq > 0 &&
  74             (ia->ia_irq[0].ir_irq != ISA_UNKNOWN_IRQ))
  75                 return (0);
  76
  77         if (ia->ia_ndrq > 0 &&
  78             (ia->ia_drq[0].ir_drq != ISA_UNKNOWN_DRQ))
  79                 return (0);
  80
  81         if (bus_space_map(ia->ia_iot, 0x70, 0x2, 0, &ioh))
  82                 return (0);
  83
  84         bus_space_unmap(ia->ia_iot, ioh, 0x2);
  85
  86         ia->ia_nio = 1;
  87         ia->ia_io[0].ir_addr = 0x70;
  88         ia->ia_io[0].ir_size = 0x02;
  89
  90         ia->ia_niomem = 0;
  91         ia->ia_nirq = 0;
  92         ia->ia_ndrq = 0;
  93
  94         return (1);
  95 }
  96
  97 void
  98 mcclock_isa_attach(device_t parent, device_t self, void *aux)
  99 {
 100         struct mc146818_softc *sc = device_private(self);
 101         struct isa_attach_args *ia = aux;
 102
 103         sc->sc_dev = self;
 104         sc->sc_bst = ia->ia_iot;
 105         if (bus_space_map(sc->sc_bst, ia->ia_io[0].ir_addr,
 106             ia->ia_io[0].ir_size, 0, &sc->sc_bsh))
 107                 panic("mcclock_isa_attach: couldn't map clock I/O space");
 108
 109         sc->sc_mcread  = mcclock_isa_read;
 110         sc->sc_mcwrite = mcclock_isa_write;
 111
 112         mcclock_attach(sc);
 113 }
 114
 115 void
 116 mcclock_isa_write(struct mc146818_softc *sc, u_int reg, u_int datum)
 117 {
 118         bus_space_tag_t iot = sc->sc_bst;
 119         bus_space_handle_t ioh = sc->sc_bsh;
 120
 121         bus_space_write_1(iot, ioh, 0, reg);
 122         bus_space_write_1(iot, ioh, 1, datum);
 123 }
 124
 125 u_int
 126 mcclock_isa_read(struct mc146818_softc *sc, u_int reg)
 127 {
 128         bus_space_tag_t iot = sc->sc_bst;
 129         bus_space_handle_t ioh = sc->sc_bsh;
 130
 131         bus_space_write_1(iot, ioh, 0, reg);
 132         return bus_space_read_1(iot, ioh, 1);
 133 }