uart_bus_ixp425.c revision 164426 
1/*-
2 * Copyright (c) 2006 Kevin Lo.  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 *
13 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
14 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
15 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
16 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
17 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
18 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
19 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
20 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
21 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
22 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
23 */
24
25#include <sys/cdefs.h>
26__FBSDID("$FreeBSD: head/sys/arm/xscale/ixp425/uart_bus_ixp425.c 164426 2006-11-19 23:55:23Z sam $");
27
28#include <sys/param.h>
29#include <sys/systm.h>
30#include <sys/bus.h>
31#include <sys/conf.h>
32#include <sys/kernel.h>
33#include <sys/module.h>
34#include <machine/bus.h>
35#include <sys/rman.h>
36#include <machine/resource.h>
37
38#include <dev/pci/pcivar.h>
39#include <dev/ic/ns16550.h>
40
41#include <dev/uart/uart.h>
42#include <dev/uart/uart_bus.h>
43#include <dev/uart/uart_cpu.h>
44
45#include <arm/xscale/ixp425/ixp425reg.h>
46#include <arm/xscale/ixp425/ixp425var.h>
47
48#include "uart_if.h"
49
50static int uart_ixp425_probe(device_t dev);
51
52static device_method_t uart_ixp425_methods[] = {
53	/* Device interface */
54	DEVMETHOD(device_probe,		uart_ixp425_probe),
55	DEVMETHOD(device_attach,	uart_bus_attach),
56	DEVMETHOD(device_detach,	uart_bus_detach),
57	{ 0, 0 }
58};
59
60static driver_t uart_ixp425_driver = {
61	uart_driver_name,
62	uart_ixp425_methods,
63	sizeof(struct uart_softc),
64};
65
66extern SLIST_HEAD(uart_devinfo_list, uart_devinfo) uart_sysdevs;
67static int
68uart_ixp425_probe(device_t dev)
69{
70	struct uart_softc *sc;
71
72	sc = device_get_softc(dev);
73	sc->sc_sysdev = SLIST_FIRST(&uart_sysdevs);
74	sc->sc_class = &uart_ns8250_class;
75	bcopy(&sc->sc_sysdev->bas, &sc->sc_bas, sizeof(sc->sc_bas));
76	/*
77	 * XXX set UART Unit Enable (0x40) AND
78	 *     receiver timeout int enable (0x10).
79	 * The first turns on the UART.  The second is necessary to get
80	 * interrupts when the FIFO has data but is not full.  Note that
81	 * uart_ns8250 carefully avoids touching these bits so we can
82	 * just set them here and proceed.  But this is fragile...
83	 */
84	bus_space_write_4(&ixp425_a4x_bs_tag,
85	    device_get_unit(dev) == 0 ? IXP425_UART0_VBASE : IXP425_UART1_VBASE,
86	    IXP425_UART_IER, IXP425_UART_IER_UUE | IXP425_UART_IER_RTOIE);
87	return(uart_bus_probe(dev, 0, IXP425_UART_FREQ, 0, 0));
88}
89
90
91DRIVER_MODULE(uart, ixp, uart_ixp425_driver, uart_devclass, 0, 0);
92