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stub_ebus.c revision 1.1.8.2 
      1 /*	$NetBSD: stub_ebus.c,v 1.1.8.2 2011/06/06 09:05:16 jruoho Exp $	*/
      2 
      3 /*-
      4  * Copyright (c) 2010 The NetBSD Foundation, Inc.
      5  * All rights reserved.
      6  *
      7  * This code was written by Alessandro Forin and Neil Pittman
      8  * at Microsoft Research and contributed to The NetBSD Foundation
      9  * by Microsoft Corporation.
     10  *
     11  * Redistribution and use in source and binary forms, with or without
     12  * modification, are permitted provided that the following conditions
     13  * are met:
     14  * 1. Redistributions of source code must retain the above copyright
     15  *    notice, this list of conditions and the following disclaimer.
     16  * 2. Redistributions in binary form must reproduce the above copyright
     17  *    notice, this list of conditions and the following disclaimer in the
     18  *    documentation and/or other materials provided with the distribution.
     19  *
     20  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     21  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     22  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     23  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     24  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     25  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     26  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     27  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     28  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     29  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     30  * POSSIBILITY OF SUCH DAMAGE.
     31  */
     32 
     33 /* Before including this file for "foo" you need to define
     34 #define STUBSTRING       "foo"
     35 #define STUBBANNER       "8MB flash memory"  -- tell the user what it is
     36 #define STUBSTRUCT       _Flash   -- whatever that struct is defined in emipsreg.h
     37 #define STUBMATCH(_f_)   (((_f_)->BaseAddressAndTag & FLASHBT_TAG) == PMTTAG_FLASH)
     38  */
     39 
     40 #include <sys/param.h>
     41 #include <sys/systm.h>
     42 #include <sys/proc.h>
     43 #include <sys/errno.h>
     44 #include <sys/ioctl.h>
     45 #include <sys/device.h>
     46 #include <sys/conf.h>
     47 
     48 #include <emips/ebus/ebusvar.h>
     49 #include <emips/emips/machdep.h>
     50 #include <machine/emipsreg.h>
     51 
     52 /*
     53  * Device softc
     54  */
     55 struct stub_softc {
     56 	struct device sc_dev;
     57 	struct STUBSTRUCT *sc_dp;
     58 };
     59 
     60 static int	stub_ebus_match (struct device *, struct cfdata *, void *);
     61 static void	stub_ebus_attach (struct device *, struct device *, void *);
     62 
     63 CFATTACH_DECL(stub_ebus, sizeof (struct stub_softc),
     64     stub_ebus_match, stub_ebus_attach, NULL, NULL);
     65 
     66 static int
     67 stub_ebus_match(struct device *parent, struct cfdata *match, void *aux)
     68 {
     69 	struct ebus_attach_args *ia = aux;
     70 	struct STUBSTRUCT *f = (struct STUBSTRUCT *)ia->ia_vaddr;
     71 
     72 	if (strcmp(STUBSTRING, ia->ia_name) != 0)
     73 		return (0);
     74 	if ((f == NULL) || (! STUBMATCH(f)))
     75 		return (0);
     76 
     77 	return (1);
     78 }
     79 
     80 static void
     81 stub_ebus_attach(struct device *parent, struct device *self, void *aux)
     82 {
     83 	struct ebus_attach_args *ia =aux;
     84 	struct stub_softc *sc = (struct stub_softc *)self;
     85 
     86 	sc->sc_dp = (struct STUBSTRUCT*)ia->ia_vaddr;
     87 
     88 #if DEBUG
     89 	printf(" virt=%p", (void*)sc->sc_dp);
     90 #endif
     91 	printf(": %s\n", STUBBANNER);
     92 
     93 }
     94 
     95 /* Required funcs
     96  */
     97 static int     stubopen(dev_t device, int flags, int fmt, struct lwp *process);
     98 static int     stubclose(dev_t device, int flags, int fmt, struct lwp *process);
     99 
    100 /* just define the character device handlers because that is all we need */
    101 const struct cdevsw stub_cdevsw = {
    102 	stubopen,
    103 	stubclose,
    104 	noread,
    105 	nowrite,
    106 	noioctl,
    107 	nostop,
    108 	notty,
    109 	nopoll,
    110 	nommap,
    111 	nokqfilter,
    112 };
    113 
    114 /*
    115  * Handle an open request on the device.
    116  */
    117 static int
    118 stubopen(dev_t device, int flags, int fmt, struct lwp *process)
    119 {
    120 	return 0; /* this always succeeds */
    121 }
    122 
    123 /*
    124  * Handle the close request for the device.
    125  */
    126 static int
    127 stubclose(dev_t device, int flags, int fmt, struct lwp *process)
    128 {
    129 	return 0; /* again this always succeeds */
    130 }
    131