uart_cpu_pc98.c revision 119978 
1/*
2 * Copyright (c) 2003 M. Warner Losh, Marcel Moolenaar
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 *
9 * 1. Redistributions of source code must retain the above copyright
10 *    notice, this list of conditions and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 *    notice, this list of conditions and the following disclaimer in the
13 *    documentation and/or other materials provided with the distribution.
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, BUT
20 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
21 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
22 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
23 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
24 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
25 */
26
27#include <sys/cdefs.h>
28__FBSDID("$FreeBSD: head/sys/dev/uart/uart_cpu_pc98.c 119978 2003-09-11 04:14:26Z imp $");
29
30#include <sys/param.h>
31#include <sys/systm.h>
32#include <sys/bus.h>
33
34#include <machine/bus.h>
35
36#include <dev/uart/uart.h>
37#include <dev/uart/uart_cpu.h>
38
39bus_addr_t
40uart_cpu_busaddr(struct uart_bas *bas)
41{
42
43	return (bas->bsh->bsh_base);
44}
45
46int
47uart_cpu_eqres(struct uart_bas *b1, struct uart_bas *b2)
48{
49
50	return ((b1->bsh == b2->bsh && b1->bst == b2->bst) ? 1 : 0);
51}
52
53int
54uart_cpu_getdev(int devtype, struct uart_devinfo *di)
55{
56	unsigned int i, ivar, flags;
57
58	/*
59	 * There are 2 built-in serial ports on pc98 hardware.  The
60	 * first one is 8251 and the second one is I think an enhance
61	 * version of that.  However, for sio flags told the story
62	 * so make a lame attempt to sort this out.
63	 */
64	for (i = 0; i < 1; i++) {
65		if (resource_int_value("uart", i, "flags", &flags))
66			continue;
67		if (devtype == UART_DEV_CONSOLE && !UART_FLAGS_CONSOLE(flags))
68			continue;
69		if (devtype == UART_DEV_DBGPORT && !UART_FLAGS_DBGPORT(flags))
70			continue;
71		/*
72		 * We have a possible device. Make sure it's enabled and
73		 * that we have an I/O port.
74		 */
75		if (resource_int_value("uart", i, "disabled", &ivar) == 0 &&
76		    ivar != 0)
77			continue;
78		if (resource_int_value("uart", i, "port", &ivar) != 0 ||
79		    ivar == 0)
80			continue;
81		/*
82		 * Got it. Fill in the instance and return it. We have
83		 * both i8251 an ns8250 and successors on pc98.
84		 */
85		if (flags & 0x100)
86			di->ops = uart_ns8250_ops;
87		else
88			di->ops = uart_i8251_ops;
89		di->bas.bst = I386_BUS_SPACE_IO;
90		i386_bus_space_handle_alloc(I386_BUS_SPACE_IO, ivar, 8,
91		    &di->bas.bsh);
92		di->bas.regshft = 0;
93		di->bas.rclk = 0;
94		if (resource_int_value("uart", i, "baud", &ivar) != 0)
95			ivar = 0;
96		di->baudrate = ivar;
97		di->databits = 8;
98		di->stopbits = 1;
99		di->parity = UART_PARITY_NONE;
100		return (0);
101	}
102
103	return (ENXIO);
104}
105