sys/arch/arc/isa/timer_isa.c

   1 /*      $NetBSD: timer_isa.c,v 1.11 2007/01/24 13:08:13 hubertf Exp $   */
   2 /*      $OpenBSD: clock_mc.c,v 1.9 1998/03/16 09:38:26 pefo Exp $       */
   3 /*      NetBSD: clock_mc.c,v 1.2 1995/06/28 04:30:30 cgd Exp    */
   4
   5 /*
   6  * Copyright (c) 1992, 1993
   7  *      The Regents of the University of California.  All rights reserved.
   8  *
   9  * This code is derived from software contributed to Berkeley by
  10  * the Systems Programming Group of the University of Utah Computer
  11  * Science Department and Ralph Campbell.
  12  *
  13  * Redistribution and use in source and binary forms, with or without
  14  * modification, are permitted provided that the following conditions
  15  * are met:
  16  * 1. Redistributions of source code must retain the above copyright
  17  *    notice, this list of conditions and the following disclaimer.
  18  * 2. Redistributions in binary form must reproduce the above copyright
  19  *    notice, this list of conditions and the following disclaimer in the
  20  *    documentation and/or other materials provided with the distribution.
  21  * 3. Neither the name of the University nor the names of its contributors
  22  *    may be used to endorse or promote products derived from this software
  23  *    without specific prior written permission.
  24  *
  25  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  26  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  27  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  28  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  29  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  30  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  31  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  32  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  33  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  34  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  35  * SUCH DAMAGE.
  36  *
  37  * from: Utah Hdr: clock.c 1.18 91/01/21
  38  *
  39  *      @(#)clock.c     8.1 (Berkeley) 6/10/93
  40  */
  41 /*
  42  * Copyright (c) 1988 University of Utah.
  43  *
  44  * This code is derived from software contributed to Berkeley by
  45  * the Systems Programming Group of the University of Utah Computer
  46  * Science Department and Ralph Campbell.
  47  *
  48  * Redistribution and use in source and binary forms, with or without
  49  * modification, are permitted provided that the following conditions
  50  * are met:
  51  * 1. Redistributions of source code must retain the above copyright
  52  *    notice, this list of conditions and the following disclaimer.
  53  * 2. Redistributions in binary form must reproduce the above copyright
  54  *    notice, this list of conditions and the following disclaimer in the
  55  *    documentation and/or other materials provided with the distribution.
  56  * 3. All advertising materials mentioning features or use of this software
  57  *    must display the following acknowledgement:
  58  *      This product includes software developed by the University of
  59  *      California, Berkeley and its contributors.
  60  * 4. Neither the name of the University nor the names of its contributors
  61  *    may be used to endorse or promote products derived from this software
  62  *    without specific prior written permission.
  63  *
  64  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  65  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  66  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  67  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  68  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  69  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  70  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  71  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  72  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  73  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  74  * SUCH DAMAGE.
  75  *
  76  * from: Utah Hdr: clock.c 1.18 91/01/21
  77  *
  78  *      @(#)clock.c     8.1 (Berkeley) 6/10/93
  79  */
  80
  81 #include <sys/cdefs.h>
  82 __KERNEL_RCSID(0, "$NetBSD: timer_isa.c,v 1.11 2007/01/24 13:08:13 hubertf Exp $");
  83
  84 #include <sys/param.h>
  85 #include <sys/kernel.h>
  86 #include <sys/systm.h>
  87 #include <sys/device.h>
  88
  89 #include <machine/bus.h>
  90
  91 #include <dev/isa/isareg.h>
  92 #include <dev/isa/isavar.h>
  93
  94 #include <dev/ic/i8253reg.h>
  95
  96 #include <arc/arc/timervar.h>
  97 #include <arc/isa/timer_isavar.h>
  98
  99 #define TIMER_IOSIZE    4
 100 #define TIMER_IRQ       0
 101
 102 struct timer_isa_softc {
 103         device_t sc_dev;
 104
 105         bus_space_tag_t sc_iot;
 106         bus_space_handle_t sc_ioh;
 107 };
 108
 109 /* Definition of the driver for autoconfig. */
 110 static int timer_isa_match(device_t, cfdata_t, void *);
 111 static void timer_isa_attach(device_t, device_t, void *);
 112
 113 CFATTACH_DECL_NEW(timer_isa, sizeof(struct timer_isa_softc),
 114     timer_isa_match, timer_isa_attach, NULL, NULL);
 115
 116 /* ISA timer access code */
 117 static void timer_isa_init(device_t);
 118
 119 struct timerfns timerfns_isa = {
 120         timer_isa_init
 121 };
 122
 123 int timer_isa_conf = 0;
 124
 125 static int
 126 timer_isa_match(device_t parent, cfdata_t cf, void *aux)
 127 {
 128         struct isa_attach_args *ia = aux;
 129         bus_space_handle_t ioh;
 130
 131         if (ia->ia_nio < 1 ||
 132             (ia->ia_io[0].ir_addr != ISA_UNKNOWN_PORT &&
 133              ia->ia_io[0].ir_addr != IO_TIMER1))
 134                 return 0;
 135
 136         if (ia->ia_niomem > 0 &&
 137             (ia->ia_iomem[0].ir_addr != ISA_UNKNOWN_IOMEM))
 138                 return 0;
 139
 140         if (ia->ia_nirq > 0 &&
 141             (ia->ia_irq[0].ir_irq != ISA_UNKNOWN_IRQ &&
 142              ia->ia_irq[0].ir_irq != TIMER_IRQ))
 143                 return 0;
 144
 145         if (ia->ia_ndrq > 0 &&
 146             (ia->ia_drq[0].ir_drq != ISA_UNKNOWN_DRQ))
 147                 return 0;
 148
 149         if (!timer_isa_conf)
 150                 return 0;
 151
 152         if (bus_space_map(ia->ia_iot, IO_TIMER1, TIMER_IOSIZE, 0, &ioh))
 153                 return 0;
 154
 155         bus_space_unmap(ia->ia_iot, ioh, TIMER_IOSIZE);
 156
 157         ia->ia_nio = 1;
 158         ia->ia_io[0].ir_addr = IO_TIMER1;
 159         ia->ia_io[0].ir_size = TIMER_IOSIZE;
 160
 161         ia->ia_niomem = 0;
 162         ia->ia_nirq = 0;
 163         ia->ia_ndrq = 0;
 164
 165         return 1;
 166 }
 167
 168 static void
 169 timer_isa_attach(device_t parent, device_t self, void *aux)
 170 {
 171         struct timer_isa_softc *sc = device_private(self);
 172         struct isa_attach_args *ia = aux;
 173         void *ih;
 174
 175         sc->sc_dev = self;
 176
 177         aprint_normal("\n");
 178
 179         sc->sc_iot = ia->ia_iot;
 180         if (bus_space_map(sc->sc_iot, ia->ia_io[0].ir_addr,
 181             ia->ia_io[0].ir_size, 0, &sc->sc_ioh))
 182                 panic("timer_isa_attach: couldn't map clock I/O space");
 183
 184         ih = isa_intr_establish(ia->ia_ic, ia->ia_irq[0].ir_irq, IST_PULSE,
 185             IPL_CLOCK, (int (*)(void *))hardclock,
 186             NULL /* clockframe is hardcoded */);
 187         if (ih == NULL)
 188                 aprint_error_dev(self, "can't establish interrupt\n");
 189
 190         timerattach(self, &timerfns_isa);
 191 }
 192
 193 static void
 194 timer_isa_init(device_t self)
 195 {
 196         struct timer_isa_softc *sc = device_private(self);
 197
 198         bus_space_write_1(sc->sc_iot, sc->sc_ioh, TIMER_MODE,
 199             TIMER_SEL0 | TIMER_16BIT | TIMER_RATEGEN);
 200         bus_space_write_1(sc->sc_iot, sc->sc_ioh, TIMER_CNTR0,
 201             TIMER_DIV(hz) % 256);
 202         bus_space_write_1(sc->sc_iot, sc->sc_ioh, TIMER_CNTR0,
 203             TIMER_DIV(hz) / 256);
 204 }