uart_iobus.c revision 139825 
1/*-
2 * Copyright 2002 by Peter Grehan. All rights reserved.
3 *
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
6 * are met:
7 * 1. Redistributions of source code must retain the above copyright
8 *    notice, this list of conditions and the following disclaimer.
9 * 2. Redistributions in binary form must reproduce the above copyright
10 *    notice, this list of conditions and the following disclaimer in the
11 *    documentation and/or other materials provided with the distribution.
12 * 3. The name of the author may not be used to endorse or promote products
13 *    derived from this software without specific prior written permission.
14 *
15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
16 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
17 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
18 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
19 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
20 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
21 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
22 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
23 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
24 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
25 * SUCH DAMAGE.
26 *
27 * $FreeBSD: head/sys/powerpc/psim/uart_iobus.c 139825 2005-01-07 02:29:27Z imp $
28 */
29
30/*
31 * PSIM local bus 16550
32 */
33
34#include <sys/param.h>
35#include <sys/systm.h>
36#include <sys/bus.h>
37#include <sys/conf.h>
38#include <sys/kernel.h>
39#include <sys/lock.h>
40#include <sys/malloc.h>
41#include <sys/mutex.h>
42#include <sys/module.h>
43#include <sys/tty.h>
44#include <machine/bus_pio.h>
45#include <machine/bus.h>
46#include <sys/timepps.h>
47
48#include <dev/ofw/openfirm.h>
49#include <powerpc/psim/iobusvar.h>
50
51#include <dev/sio/sioreg.h>
52#include <dev/sio/siovar.h>
53
54#include <isa/isavar.h>  /* for isa_irq_pending() prototype */
55
56static  int     sio_iobus_attach(device_t dev);
57static  int     sio_iobus_probe(device_t dev);
58
59static device_method_t sio_iobus_methods[] = {
60        /* Device interface */
61	DEVMETHOD(device_probe,         sio_iobus_probe),
62	DEVMETHOD(device_attach,        sio_iobus_attach),
63
64	{ 0, 0 }
65};
66
67static driver_t sio_iobus_driver = {
68	sio_driver_name,
69	sio_iobus_methods,
70	0,
71};
72
73static int
74sio_iobus_attach(device_t dev)
75{
76	return (sioattach(dev, 0, DEFAULT_RCLK));
77}
78
79static int
80sio_iobus_probe(device_t dev)
81{
82	char *type = iobus_get_name(dev);
83
84	if (strncmp(type, "com", 3) != 0)
85		return (ENXIO);
86
87
88	device_set_desc(dev, "PSIM serial port");
89
90	/*
91	 * Call sioprobe with noprobe=1, to avoid hitting a psim bug
92	 */
93	return (sioprobe(dev, 0, 0, 1));
94}
95
96DRIVER_MODULE(sio, iobus, sio_iobus_driver, sio_devclass, 0, 0);
97
98/*
99 * Stub function. Perhaps a way to get this to work correctly would
100 * be for child devices to set a field in the dev structure to
101 * inform the parent that they are isa devices, and then use a
102 * intr_pending() call which would propagate up to nexus to see
103 * if the interrupt controller had any intrs in the isa group set
104 */
105intrmask_t
106isa_irq_pending(void)
107{
108	return (0);
109}
110