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      1 /*	$NetBSD: stub_ebus.c,v 1.4 2014/07/25 08:10:32 dholland 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 STUBSTRUCT *sc_dp;
     57 };
     58 
     59 static int	stub_ebus_match (device_t, cfdata_t, void *);
     60 static void	stub_ebus_attach (device_t, device_t, void *);
     61 
     62 CFATTACH_DECL_NEW(stub_ebus, sizeof (struct stub_softc),
     63     stub_ebus_match, stub_ebus_attach, NULL, NULL);
     64 
     65 static int
     66 stub_ebus_match(device_t parent, cfdata_t match, void *aux)
     67 {
     68 	struct ebus_attach_args *ia = aux;
     69 	struct STUBSTRUCT *f = (struct STUBSTRUCT *)ia->ia_vaddr;
     70 
     71 	if (strcmp(STUBSTRING, ia->ia_name) != 0)
     72 		return (0);
     73 	if ((f == NULL) || (! STUBMATCH(f)))
     74 		return (0);
     75 
     76 	return (1);
     77 }
     78 
     79 static void
     80 stub_ebus_attach(device_t parent, device_t self, void *aux)
     81 {
     82 	struct ebus_attach_args *ia =aux;
     83 	struct stub_softc *sc = device_private(self);
     84 
     85 	sc->sc_dp = (struct STUBSTRUCT*)ia->ia_vaddr;
     86 
     87 #if DEBUG
     88 	printf(" virt=%p", (void*)sc->sc_dp);
     89 #endif
     90 	printf(": %s\n", STUBBANNER);
     91 
     92 }
     93 
     94 /* Required funcs
     95  */
     96 static int     stubopen(dev_t device, int flags, int fmt, struct lwp *process);
     97 static int     stubclose(dev_t device, int flags, int fmt, struct lwp *process);
     98 
     99 /* just define the character device handlers because that is all we need */
    100 const struct cdevsw stub_cdevsw = {
    101 	.d_open = stubopen,
    102 	.d_close = stubclose,
    103 	.d_read = noread,
    104 	.d_write = nowrite,
    105 	.d_ioctl = noioctl,
    106 	.d_stop = nostop,
    107 	.d_tty = notty,
    108 	.d_poll = nopoll,
    109 	.d_mmap = nommap,
    110 	.d_kqfilter = nokqfilter,
    111 	.d_discard = nodiscard,
    112 	.d_flag = 0
    113 };
    114 
    115 /*
    116  * Handle an open request on the device.
    117  */
    118 static int
    119 stubopen(dev_t device, int flags, int fmt, struct lwp *process)
    120 {
    121 	return 0; /* this always succeeds */
    122 }
    123 
    124 /*
    125  * Handle the close request for the device.
    126  */
    127 static int
    128 stubclose(dev_t device, int flags, int fmt, struct lwp *process)
    129 {
    130 	return 0; /* again this always succeeds */
    131 }
    132