sys/arch/arm/gemini/obio_wdt.c

   1 /*      $NetBSD: obio_wdt.c,v 1.4 2008/11/08 09:37:13 cliff Exp $       */
   2
   3 /*
   4  * Copyright (c) 2007 Microsoft
   5  * All rights reserved.
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions
   9  * are met:
  10  * 1. Redistributions of source code must retain the above copyright
  11  *    notice, this list of conditions and the following disclaimer.
  12  * 2. Redistributions in binary form must reproduce the above copyright
  13  *    notice, this list of conditions and the following disclaimer in the
  14  *    documentation and/or other materials provided with the distribution.
  15  * 3. All advertising materials mentioning features or use of this software
  16  *    must display the following acknowledgement:
  17  *     This product includes software developed by Microsoft
  18  *
  19  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
  20  * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
  21  * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  22  * IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTERS BE LIABLE FOR ANY DIRECT,
  23  * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
  24  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
  25  * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  26  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  27  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  28  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  29  * SUCH DAMAGE.
  30  */
  31
  32 /*
  33  * obio attachment for GEMINI watchdog timers
  34  */
  35 #include "opt_gemini.h"
  36 #include "locators.h"
  37
  38 #include <sys/cdefs.h>
  39 __KERNEL_RCSID(0, "$NetBSD: obio_wdt.c,v 1.4 2008/11/08 09:37:13 cliff Exp $");
  40
  41 #include <sys/param.h>
  42 #include <sys/callout.h>
  43 #include <sys/cdefs.h>
  44 #include <sys/device.h>
  45 #include <sys/kernel.h>
  46 #include <sys/systm.h>
  47 #include <sys/wdog.h>
  48
  49 #include <machine/param.h>
  50 #include <machine/bus.h>
  51 #include <dev/sysmon/sysmonvar.h>
  52
  53 #include <arm/gemini/gemini_obiovar.h>
  54 #include <arm/gemini/gemini_wdtvar.h>
  55 #include <arm/gemini/gemini_reg.h>
  56
  57 static int geminiwdt_match(struct device *, struct cfdata *, void *);
  58 static void geminiwdt_attach(struct device *, struct device *, void *);
  59
  60 CFATTACH_DECL_NEW(obiowdt, sizeof(struct geminiwdt_softc),
  61     geminiwdt_match, geminiwdt_attach, NULL, NULL);
  62
  63 static int
  64 geminiwdt_match(struct device *parent, struct cfdata *cf, void *aux)
  65 {
  66         struct obio_attach_args *obio = aux;
  67
  68         if (obio->obio_addr == OBIOCF_ADDR_DEFAULT)
  69                 panic("geminiwdt must have addr specified in config.");
  70
  71         if (obio->obio_addr == GEMINI_WATCHDOG_BASE)
  72                 return 1;
  73
  74         return 0;
  75 }
  76
  77 static void
  78 geminiwdt_attach(struct device *parent, struct device *self, void *aux)
  79 {
  80         geminiwdt_softc_t *sc = device_private(self);
  81         struct obio_attach_args *obio = aux;
  82
  83         sc->sc_dev = self;
  84         sc->sc_addr = obio->obio_addr;
  85         sc->sc_size = (obio->obio_size == OBIOCF_SIZE_DEFAULT)
  86                 ? GEMINI_WDT_WDINTERLEN + 4
  87                 : obio->obio_size;
  88
  89         sc->sc_smw.smw_name = device_xname(sc->sc_dev);
  90         sc->sc_smw.smw_cookie = sc;
  91         sc->sc_smw.smw_setmode = geminiwdt_setmode;
  92         sc->sc_smw.smw_tickle = geminiwdt_tickle;
  93         sc->sc_smw.smw_period = 0;
  94         sc->sc_iot = obio->obio_iot;
  95
  96         if (bus_space_map(sc->sc_iot, sc->sc_addr, sc->sc_size, 0, &sc->sc_ioh))
  97                 panic("%s: Cannot map registers", device_xname(self));
  98
  99         geminiwdt_sc = sc;
 100
 101         sc->sc_armed = 1;       /* fake armed so can disarm */
 102         geminiwdt_enable(0);    /* disable, stop, disarm */
 103
 104         if (sysmon_wdog_register(&sc->sc_smw) != 0) {
 105                 geminiwdt_sc = NULL;
 106                 aprint_error("%s: unable to register with sysmon\n",
 107                              device_xname(sc->sc_dev));
 108         }
 109
 110         aprint_normal("\n");
 111         aprint_naive("\n");
 112 }