uart_cpu_ixp425.c revision 330897 
1/*-
2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
3 *
4 * Copyright (c) 2003 Marcel Moolenaar
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 *
11 * 1. Redistributions of source code must retain the above copyright
12 *    notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 *    notice, this list of conditions and the following disclaimer in the
15 *    documentation and/or other materials provided with the distribution.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
18 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
19 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
20 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
21 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
22 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
23 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
24 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
26 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27 */
28
29#include <sys/cdefs.h>
30__FBSDID("$FreeBSD: stable/11/sys/arm/xscale/ixp425/uart_cpu_ixp425.c 330897 2018-03-14 03:19:51Z eadler $");
31
32#include <sys/param.h>
33#include <sys/systm.h>
34#include <sys/bus.h>
35#include <sys/cons.h>
36#include <machine/bus.h>
37
38#include <dev/uart/uart.h>
39#include <dev/uart/uart_cpu.h>
40
41#include <arm/xscale/ixp425/ixp425reg.h>
42#include <arm/xscale/ixp425/ixp425var.h>
43
44bus_space_tag_t uart_bus_space_io;
45bus_space_tag_t uart_bus_space_mem;
46
47int
48uart_cpu_eqres(struct uart_bas *b1, struct uart_bas *b2)
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	uint32_t i, ivar, vaddr;
57
58	/*
59	 * Scan the hints. The IXP425 only have 2 serial ports, so only
60	 * scan them.
61	 */
62	for (i = 0; i < 2; i++) {
63		if (resource_int_value("uart", i, "flags", &ivar))
64			continue;
65		if (devtype == UART_DEV_CONSOLE && !UART_FLAGS_CONSOLE(ivar))
66			continue;
67		if (devtype == UART_DEV_DBGPORT && !UART_FLAGS_DBGPORT(ivar))
68			continue;
69		/*
70		 * We have a possible device. Make sure it's enabled and
71		 * that we have an I/O port.
72		 */
73		if (resource_int_value("uart", i, "disabled", &ivar) == 0 &&
74		    ivar != 0)
75			continue;
76		if (resource_int_value("uart", i, "addr", &ivar) != 0 ||
77		    ivar == 0)
78			continue;
79		/* Got it. Fill in the instance and return it. */
80		di->ops = uart_getops(&uart_ns8250_class);
81		di->bas.chan = 0;
82		di->bas.bst = &ixp425_a4x_bs_tag;
83		di->bas.regshft = 0;
84		di->bas.rclk = IXP425_UART_FREQ;
85		di->baudrate = 115200;
86		di->databits = 8;
87		di->stopbits = 1;
88		di->parity = UART_PARITY_NONE;
89		uart_bus_space_io = NULL;
90		uart_bus_space_mem = &ixp425_a4x_bs_tag;
91
92		getvbase(ivar, IXP425_REG_SIZE, &vaddr);
93		di->bas.bsh = vaddr;
94		return (0);
95	}
96
97	return (ENXIO);
98}
99