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vrdsu.c revision 1.11 
      1 /*	$NetBSD: vrdsu.c,v 1.11 2012/10/27 17:17:56 chs 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 1.11 2012/10/27 17:17:56 chs 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 	bus_space_tag_t sc_iot;
     45 	bus_space_handle_t sc_ioh;
     46 };
     47 
     48 static int vrdsumatch(device_t, cfdata_t, void *);
     49 static void vrdsuattach(device_t, device_t, void *);
     50 
     51 static void vrdsu_write(struct vrdsu_softc *, int, unsigned short);
     52 static unsigned short vrdsu_read(struct vrdsu_softc *, int);
     53 
     54 CFATTACH_DECL_NEW(vrdsu, sizeof(struct vrdsu_softc),
     55     vrdsumatch, vrdsuattach, NULL, NULL);
     56 
     57 struct vrdsu_softc *the_dsu_sc = NULL;
     58 
     59 static inline void
     60 vrdsu_write(struct vrdsu_softc *sc, int port, unsigned short val)
     61 {
     62 
     63 	bus_space_write_2(sc->sc_iot, sc->sc_ioh, port, val);
     64 }
     65 
     66 static inline unsigned short
     67 vrdsu_read(struct vrdsu_softc *sc, int port)
     68 {
     69 
     70 	return (bus_space_read_2(sc->sc_iot, sc->sc_ioh, port));
     71 }
     72 
     73 static int
     74 vrdsumatch(device_t parent, cfdata_t cf, void *aux)
     75 {
     76 
     77 	return (1);
     78 }
     79 
     80 static void
     81 vrdsuattach(device_t parent, device_t self, void *aux)
     82 {
     83 	struct vrdsu_softc *sc = device_private(self);
     84 	struct vrip_attach_args *va = aux;
     85 
     86 	sc->sc_iot = va->va_iot;
     87 	if (bus_space_map(va->va_iot, va->va_addr, va->va_size,
     88 	    0, &sc->sc_ioh)) {
     89 		printf(": can't map bus space\n");
     90 		return;
     91 	}
     92 	printf("\n");
     93 	the_dsu_sc = sc;
     94 }
     95 
     96 void
     97 vrdsu_reset(void)
     98 {
     99 
    100 	if (the_dsu_sc) {
    101 		splhigh();
    102 		vrdsu_write(the_dsu_sc, DSUSET_REG_W, 1); /* 1 sec */
    103 		vrdsu_write(the_dsu_sc, DSUCNT_REG_W, DSUCNT_DSWEN);
    104 		/*
    105 		 * wipe out all physical memory for clean WinCE boot.
    106 		 */
    107 		memset((void *)MIPS_PHYS_TO_KSEG1(0), 0, ptoa(physmem) - 0);
    108 		while (1);
    109 	} else {
    110 		printf("%s(%d): There is no DSU.", __FILE__, __LINE__);
    111 	}
    112 }
    113