uart_cpu_pc98.c revision 120381 
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 120381 2003-09-23 13:03:22Z nyan $");
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
39int
40uart_cpu_eqres(struct uart_bas *b1, struct uart_bas *b2)
41{
42
43	return ((b1->iobase == b2->iobase && b1->bst == b2->bst) ? 1 : 0);
44}
45
46int
47uart_cpu_getdev(int devtype, struct uart_devinfo *di)
48{
49	unsigned int i, ivar, flags;
50
51	/*
52	 * There are 2 built-in serial ports on pc98 hardware.  The
53	 * first one is 8251 and the second one is I think an enhance
54	 * version of that.  However, for the sio driver, flags selected
55	 * which type of uart was in the sytem.  We use something similar
56	 * to sort things out.
57	 */
58	for (i = 0; i < 1; i++) {
59		if (resource_int_value("uart", i, "flags", &flags))
60			continue;
61		if (devtype == UART_DEV_CONSOLE && !UART_FLAGS_CONSOLE(flags))
62			continue;
63		if (devtype == UART_DEV_DBGPORT && !UART_FLAGS_DBGPORT(flags))
64			continue;
65		/*
66		 * We have a possible device. Make sure it's enabled and
67		 * that we have an I/O port.
68		 */
69		if (resource_int_value("uart", i, "disabled", &ivar) == 0 &&
70		    ivar != 0)
71			continue;
72		if (resource_int_value("uart", i, "port", &ivar) != 0 ||
73		    ivar == 0)
74			continue;
75		/*
76		 * Got it. Fill in the instance and return it. We have
77		 * both i8251 an ns8250 and successors on pc98.
78		 */
79		if (flags & 0x100)
80			di->ops = uart_ns8250_ops;
81		else
82			di->ops = uart_i8251_ops;
83		di->bas.iobase = ivar;
84		di->bas.bst = I386_BUS_SPACE_IO;
85		if (bus_space_map(di->bas.bst, ivar, 8, 0, &di->bas.bsh) != 0)
86			continue;
87		di->bas.regshft = 0;
88		di->bas.rclk = 0;
89		if (resource_int_value("uart", i, "baud", &ivar) != 0)
90			ivar = 0;
91		di->baudrate = ivar;
92		di->databits = 8;
93		di->stopbits = 1;
94		di->parity = UART_PARITY_NONE;
95		return (0);
96	}
97
98	return (ENXIO);
99}
100