1/*-
2 * Copyright (c) 2006 Benno Rice.  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("$FreeBSD$");
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
40#include <dev/uart/uart.h>
41#include <dev/uart/uart_bus.h>
42#include <dev/uart/uart_cpu.h>
43
44#include <dev/ic/ns16550.h>
45
46#include <arm/xscale/pxa/pxavar.h>
47#include <arm/xscale/pxa/pxareg.h>
48
49#include "uart_if.h"
50
51#define	PXA_UART_UUE	0x40	/* UART Unit Enable */
52
53static int uart_pxa_probe(device_t dev);
54
55static device_method_t uart_pxa_methods[] = {
56	/* Device interface */
57	DEVMETHOD(device_probe,		uart_pxa_probe),
58	DEVMETHOD(device_attach,	uart_bus_attach),
59	DEVMETHOD(device_detach,	uart_bus_detach),
60	{ 0, 0 }
61};
62
63static driver_t uart_pxa_driver = {
64	uart_driver_name,
65	uart_pxa_methods,
66	sizeof(struct uart_softc),
67};
68
69static int
70uart_pxa_probe(device_t dev)
71{
72	bus_space_handle_t	base;
73	struct			uart_softc *sc;
74
75	base = (bus_space_handle_t)pxa_get_base(dev);
76#ifdef QEMU_WORKAROUNDS
77	/*
78	 * QEMU really exposes only the first uart unless
79	 * you specify several of them in the configuration.
80	 * Otherwise all the rest of UARTs stay unconnected,
81	 * which causes problems in the ns16550 attach routine.
82	 * Unfortunately, even if you provide qemu with 4 uarts
83	 * on the command line, it has a bug where it segfaults
84	 * trying to enable bluetooth on the HWUART.  So we just
85	 * allow the FFUART to be attached.
86	 * Also, don't check the UUE (UART Unit Enable) bit, as
87	 * the gumstix bootloader doesn't set it.
88	 */
89	if (base != PXA2X0_FFUART_BASE)
90		return (ENXIO);
91#else
92	/* Check to see if the enable bit's on. */
93	if ((bus_space_read_4(obio_tag, base,
94	    (REG_IER << 2)) & PXA_UART_UUE) == 0)
95		return (ENXIO);
96#endif
97	sc = device_get_softc(dev);
98	sc->sc_class = &uart_ns8250_class;
99
100	return(uart_bus_probe(dev, 2, PXA2X0_COM_FREQ, 0, 0));
101}
102
103DRIVER_MODULE(uart, pxa, uart_pxa_driver, uart_devclass, 0, 0);
104