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
stub_ebus_match(device_t parent,cfdata_t match,void * aux)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
stub_ebus_attach(device_t parent,device_t self,void * aux)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
stubopen(dev_t device,int flags,int fmt,struct lwp * process)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
stubclose(dev_t device,int flags,int fmt,struct lwp * process)128 stubclose(dev_t device, int flags, int fmt, struct lwp *process)
129 {
130 return 0; /* again this always succeeds */
131 }
132