sys/arch/arm/omap/obio_wdt.c

   1 /*
   2  * Copyright (c) 2007 Microsoft
   3  * All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  * 3. All advertising materials mentioning features or use of this software
  14  *    must display the following acknowledgement:
  15  *     This product includes software developed by Microsoft
  16  *
  17  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
  18  * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
  19  * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  20  * IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTERS BE LIABLE FOR ANY DIRECT,
  21  * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
  22  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
  23  * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  27  * SUCH DAMAGE.
  28  */
  29
  30 /*
  31  * obio attachment for OMAP watchdog timers
  32  */
  33 #include "opt_omap.h"
  34
  35 #include <sys/cdefs.h>
  36 __KERNEL_RCSID(0, "$NetBSD: obio_wdt.c,v 1.3 2008/08/27 11:03:10 matt Exp $");
  37
  38 #include <sys/param.h>
  39 #include <sys/callout.h>
  40 #include <sys/cdefs.h>
  41 #include <sys/device.h>
  42 #include <sys/kernel.h>
  43 #include <sys/systm.h>
  44 #include <sys/wdog.h>
  45
  46 #include <machine/param.h>
  47 #include <machine/bus.h>
  48 #include <dev/sysmon/sysmonvar.h>
  49
  50 #include <arm/omap/omap2_obiovar.h>
  51
  52 #include <arm/omap/omap_wdtvar.h>
  53 #include <arm/omap/omap_wdtreg.h>
  54
  55 static int obiowdt32k_match(device_t, cfdata_t, void *);
  56 static void obiowdt32k_attach(device_t, device_t, void *);
  57
  58 CFATTACH_DECL_NEW(obiowdt32k, sizeof(struct omapwdt32k_softc),
  59     obiowdt32k_match, obiowdt32k_attach, NULL, NULL);
  60
  61 static int
  62 obiowdt32k_match(device_t parent, cfdata_t cf, void *aux)
  63 {
  64         return (1);
  65 }
  66
  67 static void
  68 obiowdt32k_attach(device_t parent, device_t self, void *aux)
  69 {
  70         struct omapwdt32k_softc *sc = device_private(self);
  71         struct obio_attach_args *obio = aux;
  72         unsigned int val;
  73
  74         sc->sc_dev = self;
  75         sc->sc_smw.smw_name = device_xname(sc->sc_dev);
  76         sc->sc_smw.smw_cookie = sc;
  77         sc->sc_smw.smw_setmode = omapwdt32k_setmode;
  78         sc->sc_smw.smw_tickle = omapwdt32k_tickle;
  79         sc->sc_smw.smw_period = OMAPWDT32K_DEFAULT_PERIOD;
  80         sc->sc_iot = obio->obio_iot;
  81
  82         if (bus_space_map(sc->sc_iot, obio->obio_addr, obio->obio_size,
  83                           0, &sc->sc_ioh))
  84                 panic("%s: Cannot map registers", device_xname(self));
  85
  86         val = bus_space_read_4(sc->sc_iot, sc->sc_ioh, WIDR);
  87         aprint_normal(": rev %d.%d\n", (val & WD_REV) >> 4,
  88                       (val & WD_REV & 0xf));
  89
  90         if (sysmon_wdog_register(&sc->sc_smw) != 0)
  91                 aprint_error("%s: unable to register with sysmon\n",
  92                              device_xname(sc->sc_dev));
  93
  94         omapwdt32k_sc = sc;
  95
  96         /* Turn on autoidle. */
  97
  98         omapwdt_sysconfig =
  99             bus_space_read_4(omapwdt32k_sc->sc_iot,
 100                              omapwdt32k_sc->sc_ioh, WD_SYSCONFIG) |
 101             (1 << WD_SYSCONFIG_AUTOIDLE);
 102         bus_space_write_4(omapwdt32k_sc->sc_iot, omapwdt32k_sc->sc_ioh,
 103                           WD_SYSCONFIG, omapwdt_sysconfig);
 104 }