i82072.c revision 1.13 
1/*	$NetBSD: i82072.c,v 1.13 2014/03/16 05:20:25 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 1.13 2014/03/16 05:20:25 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
48dev_type_open(fdopen);
49dev_type_strategy(fdstrategy);
50
51const 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_flag = D_DISK
59};
60
61const struct cdevsw fd_cdevsw = {
62	.d_open = fdopen,
63	.d_close = nullclose,
64	.d_read = noread,
65	.d_write = nowrite,
66	.d_ioctl = noioctl,
67	.d_stop = nostop,
68	.d_tty = notty,
69	.d_poll = nopoll,
70	.d_mmap = nommap,
71	.d_kqfilter = nokqfilter,
72	.d_flag = D_DISK
73};
74
75#define	I82072_STATUS	0x000003
76#define	I82072_DATA	0x000007
77#define	I82072_TC	0x800003
78
79struct	fd_softc {
80        device_t dev;
81        struct  evcnt  fd_intrcnt;
82	bus_space_tag_t	fd_bst;
83	bus_space_handle_t fd_bsh;
84        int     unit;
85};
86
87static int	fd_match (device_t, cfdata_t, void *);
88static void	fd_attach (device_t, device_t, void *);
89static void     fd_reset (struct fd_softc *);
90
91CFATTACH_DECL_NEW(fd, sizeof(struct fd_softc),
92    fd_match, fd_attach, NULL, NULL);
93
94static int	fd_intr (void *);
95
96int
97fd_match(device_t parent, cfdata_t cf, void *aux)
98{
99	return 1;
100}
101
102void
103fd_attach(device_t parent, device_t self, void *aux)
104{
105        struct fd_softc *sc = device_private(self);
106	struct confargs *ca = aux;
107
108	sc->fd_bst = ca->ca_bustag;
109	if (bus_space_map(ca->ca_bustag, ca->ca_addr,
110			  0x1000000,
111			  BUS_SPACE_MAP_LINEAR,
112			  &sc->fd_bsh) != 0) {
113		printf("%s: cannot map registers\n", device_xname(self));
114		return;
115	}
116	evcnt_attach_dynamic(&sc->fd_intrcnt, EVCNT_TYPE_INTR, NULL,
117			     device_xname(self), "intr");
118
119	bus_intr_establish(sc->fd_bst, SYS_INTR_FDC, 0, 0, fd_intr, sc);
120
121	fd_reset(sc);
122	printf(": not fully implemented\n");
123}
124
125void
126fd_reset(struct fd_softc *sc)
127{
128	/* This clears any pending interrupts from the i82072 FDC */
129	bus_space_write_1(sc->fd_bst, sc->fd_bsh, I82072_STATUS, 0x80);
130	DELAY(1000);
131	bus_space_write_1(sc->fd_bst, sc->fd_bsh, I82072_TC, 0x01);
132	DELAY(1000);
133}
134
135int
136fdopen(dev_t dev, int flags, int mode, struct lwp *l)
137{
138	return (EBADF);
139}
140
141void
142fdstrategy(struct buf *bp)
143{
144	panic("fdstrategy");
145}
146
147static int
148fd_intr(void *arg)
149{
150	struct fd_softc *sc = arg;
151
152	sc->fd_intrcnt.ev_count++;
153	fd_reset(sc);
154	return 0;
155}
156