1 /* $NetBSD: i82072.c,v 1.15 2014/07/25 08:10:34 dholland Exp $ */
2 /*-
3 * Copyright (c) 2000 The NetBSD Foundation, Inc.
4 * All rights reserved.
5 *
6 * This code is derived from software contributed to The NetBSD Foundation
7 * by Wayne Knowles
8 *
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
11 * are met:
12 * 1. Redistributions of source code must retain the above copyright
13 * notice, this list of conditions and the following disclaimer.
14 * 2. Redistributions in binary form must reproduce the above copyright
15 * notice, this list of conditions and the following disclaimer in the
16 * documentation and/or other materials provided with the distribution.
17 *
18 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
19 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
20 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
21 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
22 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
23 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
24 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
25 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
26 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
27 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
28 * POSSIBILITY OF SUCH DAMAGE.
29 */
30
31 #include <sys/cdefs.h>
32 __KERNEL_RCSID(0, "$NetBSD: i82072.c,v 1.15 2014/07/25 08:10:34 dholland Exp $");
33
34 #include <sys/param.h>
35 #include <sys/systm.h>
36 #include <sys/mbuf.h>
37 #include <sys/syslog.h>
38 #include <sys/socket.h>
39 #include <sys/device.h>
40 #include <sys/conf.h>
41 #include <sys/event.h>
42
43 #include <machine/cpu.h>
44 #include <machine/autoconf.h>
45 #include <machine/mainboard.h>
46 #include <machine/bus.h>
47
48 dev_type_open(fdopen);
49 dev_type_strategy(fdstrategy);
50
51 const struct bdevsw fd_bdevsw = {
52 .d_open = fdopen,
53 .d_close = nullclose,
54 .d_strategy = fdstrategy,
55 .d_ioctl = noioctl,
56 .d_dump = nodump,
57 .d_psize = nosize,
58 .d_discard = nodiscard,
59 .d_flag = D_DISK
60 };
61
62 const struct cdevsw fd_cdevsw = {
63 .d_open = fdopen,
64 .d_close = nullclose,
65 .d_read = noread,
66 .d_write = nowrite,
67 .d_ioctl = noioctl,
68 .d_stop = nostop,
69 .d_tty = notty,
70 .d_poll = nopoll,
71 .d_mmap = nommap,
72 .d_kqfilter = nokqfilter,
73 .d_discard = nodiscard,
74 .d_flag = D_DISK
75 };
76
77 #define I82072_STATUS 0x000003
78 #define I82072_DATA 0x000007
79 #define I82072_TC 0x800003
80
81 struct fd_softc {
82 device_t dev;
83 struct evcnt fd_intrcnt;
84 bus_space_tag_t fd_bst;
85 bus_space_handle_t fd_bsh;
86 int unit;
87 };
88
89 static int fd_match (device_t, cfdata_t, void *);
90 static void fd_attach (device_t, device_t, void *);
91 static void fd_reset (struct fd_softc *);
92
93 CFATTACH_DECL_NEW(fd, sizeof(struct fd_softc),
94 fd_match, fd_attach, NULL, NULL);
95
96 static int fd_intr (void *);
97
98 int
fd_match(device_t parent,cfdata_t cf,void * aux)99 fd_match(device_t parent, cfdata_t cf, void *aux)
100 {
101 return 1;
102 }
103
104 void
fd_attach(device_t parent,device_t self,void * aux)105 fd_attach(device_t parent, device_t self, void *aux)
106 {
107 struct fd_softc *sc = device_private(self);
108 struct confargs *ca = aux;
109
110 sc->fd_bst = ca->ca_bustag;
111 if (bus_space_map(ca->ca_bustag, ca->ca_addr,
112 0x1000000,
113 BUS_SPACE_MAP_LINEAR,
114 &sc->fd_bsh) != 0) {
115 printf("%s: cannot map registers\n", device_xname(self));
116 return;
117 }
118 evcnt_attach_dynamic(&sc->fd_intrcnt, EVCNT_TYPE_INTR, NULL,
119 device_xname(self), "intr");
120
121 bus_intr_establish(sc->fd_bst, SYS_INTR_FDC, 0, 0, fd_intr, sc);
122
123 fd_reset(sc);
124 printf(": not fully implemented\n");
125 }
126
127 void
fd_reset(struct fd_softc * sc)128 fd_reset(struct fd_softc *sc)
129 {
130 /* This clears any pending interrupts from the i82072 FDC */
131 bus_space_write_1(sc->fd_bst, sc->fd_bsh, I82072_STATUS, 0x80);
132 DELAY(1000);
133 bus_space_write_1(sc->fd_bst, sc->fd_bsh, I82072_TC, 0x01);
134 DELAY(1000);
135 }
136
137 int
fdopen(dev_t dev,int flags,int mode,struct lwp * l)138 fdopen(dev_t dev, int flags, int mode, struct lwp *l)
139 {
140 return (EBADF);
141 }
142
143 void
fdstrategy(struct buf * bp)144 fdstrategy(struct buf *bp)
145 {
146 panic("fdstrategy");
147 }
148
149 static int
fd_intr(void * arg)150 fd_intr(void *arg)
151 {
152 struct fd_softc *sc = arg;
153
154 sc->fd_intrcnt.ev_count++;
155 fd_reset(sc);
156 return 0;
157 }
158