sys/arch/hpcmips/vr/vrdsu.c

   1 /*      $NetBSD: vrdsu.c,v 1.9 2005/12/11 12:17:34 christos Exp $       */
   2
   3 /*
   4  * Copyright (c) 1999 Shin Takemura All rights reserved.
   5  * Copyright (c) 1999 PocketBSD Project. 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  *
  16  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  17  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  18  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  19  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  20  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  21  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  22  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  23  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  24  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  25  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  26  * SUCH DAMAGE.
  27  */
  28
  29 #include <sys/cdefs.h>
  30 __KERNEL_RCSID(0, "$NetBSD: vrdsu.c,v 1.9 2005/12/11 12:17:34 christos Exp $");
  31
  32 #include <sys/param.h>
  33 #include <sys/systm.h>
  34 #include <sys/device.h>
  35 #include <uvm/uvm_param.h>
  36
  37 #include <machine/bus.h>
  38
  39 #include <hpcmips/vr/vripif.h>
  40 #include <hpcmips/vr/dsureg.h>
  41 #include <hpcmips/vr/vrdsuvar.h>
  42
  43 struct vrdsu_softc {
  44         struct device sc_dev;
  45         bus_space_tag_t sc_iot;
  46         bus_space_handle_t sc_ioh;
  47 };
  48
  49 static int vrdsumatch(struct device *, struct cfdata *, void *);
  50 static void vrdsuattach(struct device *, struct device *, void *);
  51
  52 static void vrdsu_write(struct vrdsu_softc *, int, unsigned short);
  53 static unsigned short vrdsu_read(struct vrdsu_softc *, int);
  54
  55 CFATTACH_DECL(vrdsu, sizeof(struct vrdsu_softc),
  56     vrdsumatch, vrdsuattach, NULL, NULL);
  57
  58 struct vrdsu_softc *the_dsu_sc = NULL;
  59
  60 static inline void
  61 vrdsu_write(struct vrdsu_softc *sc, int port, unsigned short val)
  62 {
  63
  64         bus_space_write_2(sc->sc_iot, sc->sc_ioh, port, val);
  65 }
  66
  67 static inline unsigned short
  68 vrdsu_read(struct vrdsu_softc *sc, int port)
  69 {
  70
  71         return (bus_space_read_2(sc->sc_iot, sc->sc_ioh, port));
  72 }
  73
  74 static int
  75 vrdsumatch(struct device *parent, struct cfdata *cf, void *aux)
  76 {
  77
  78         return (1);
  79 }
  80
  81 static void
  82 vrdsuattach(struct device *parent, struct device *self, void *aux)
  83 {
  84         struct vrdsu_softc *sc = (struct vrdsu_softc *)self;
  85         struct vrip_attach_args *va = aux;
  86
  87         sc->sc_iot = va->va_iot;
  88         if (bus_space_map(va->va_iot, va->va_addr, va->va_size,
  89             0, &sc->sc_ioh)) {
  90                 printf(": can't map bus space\n");
  91                 return;
  92         }
  93         printf("\n");
  94         the_dsu_sc = sc;
  95 }
  96
  97 void
  98 vrdsu_reset(void)
  99 {
 100
 101         if (the_dsu_sc) {
 102                 splhigh();
 103                 vrdsu_write(the_dsu_sc, DSUSET_REG_W, 1); /* 1 sec */
 104                 vrdsu_write(the_dsu_sc, DSUCNT_REG_W, DSUCNT_DSWEN);
 105                 /*
 106                  * wipe out all physical memory for clean WinCE boot.
 107                  */
 108                 memset((void *)MIPS_PHYS_TO_KSEG1(0), 0, ptoa(physmem) - 0);
 109                 while (1);
 110         } else {
 111                 printf("%s(%d): There is no DSU.", __FILE__, __LINE__);
 112         }
 113 }