uart_bus_at91usart.c revision 238325 
1/*-
2 * Copyright (c) 2005 Olivier Houchard.  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 AUTHOR AND CONTRIBUTORS ``AS IS'' AND
14 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
15 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
16 * ARE DISCLAIMED.  IN NO EVENT SHALL AUTHOR OR CONTRIBUTORS BE LIABLE
17 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
18 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
19 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
20 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
21 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
22 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
23 * SUCH DAMAGE.
24 */
25
26#include "opt_uart.h"
27
28#include <sys/cdefs.h>
29__FBSDID("$FreeBSD: head/sys/arm/at91/uart_bus_at91usart.c 238325 2012-07-10 01:13:00Z imp $");
30
31#include <sys/param.h>
32#include <sys/systm.h>
33#include <sys/bus.h>
34#include <sys/conf.h>
35#include <sys/kernel.h>
36#include <sys/module.h>
37#include <machine/bus.h>
38#include <sys/rman.h>
39#include <machine/resource.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/at91/at91var.h>
46
47#include "uart_if.h"
48
49static int usart_at91_probe(device_t dev);
50
51extern struct uart_class at91_usart_class;
52
53static device_method_t usart_at91_methods[] = {
54	/* Device interface */
55	DEVMETHOD(device_probe,		usart_at91_probe),
56	DEVMETHOD(device_attach,	uart_bus_attach),
57	DEVMETHOD(device_detach,	uart_bus_detach),
58	{ 0, 0 }
59};
60
61static driver_t usart_at91_driver = {
62	uart_driver_name,
63	usart_at91_methods,
64	sizeof(struct uart_softc),
65};
66
67extern SLIST_HEAD(uart_devinfo_list, uart_devinfo) uart_sysdevs;
68
69static int
70usart_at91_probe(device_t dev)
71{
72	struct uart_softc *sc;
73
74	sc = device_get_softc(dev);
75	switch (device_get_unit(dev))
76	{
77	case 0:
78		device_set_desc(dev, "DBGU");
79		/*
80		 * Setting sc_sysdev makes this device a 'system device' and
81		 * indirectly makes it the system console.
82		 */
83		sc->sc_sysdev = SLIST_FIRST(&uart_sysdevs);
84		bcopy(&sc->sc_sysdev->bas, &sc->sc_bas, sizeof(sc->sc_bas));
85		break;
86	case 1:
87		device_set_desc(dev, "USART0");
88		break;
89	case 2:
90		device_set_desc(dev, "USART1");
91		break;
92	case 3:
93		device_set_desc(dev, "USART2");
94		break;
95	case 4:
96		device_set_desc(dev, "USART3");
97		break;
98	}
99	sc->sc_class = &at91_usart_class;
100	if (sc->sc_class->uc_rclk == 0)
101		sc->sc_class->uc_rclk = at91_master_clock;
102	return (uart_bus_probe(dev, 0, 0, 0, device_get_unit(dev)));
103}
104
105
106DRIVER_MODULE(uart, atmelarm, usart_at91_driver, uart_devclass, 0, 0);
107