2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
4 * Copyright (c) 2006 Benno Rice. All rights reserved.
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
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.
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.
27 #include <sys/cdefs.h>
28 __FBSDID("$FreeBSD$");
30 #include <sys/param.h>
31 #include <sys/systm.h>
34 #include <sys/kernel.h>
35 #include <sys/module.h>
36 #include <machine/bus.h>
38 #include <machine/resource.h>
40 #include <dev/pci/pcivar.h>
42 #include <dev/uart/uart.h>
43 #include <dev/uart/uart_bus.h>
44 #include <dev/uart/uart_cpu.h>
46 #include <dev/ic/ns16550.h>
48 #include <arm/xscale/pxa/pxavar.h>
49 #include <arm/xscale/pxa/pxareg.h>
53 #define PXA_UART_UUE 0x40 /* UART Unit Enable */
55 static int uart_pxa_probe(device_t dev);
57 static device_method_t uart_pxa_methods[] = {
58 /* Device interface */
59 DEVMETHOD(device_probe, uart_pxa_probe),
60 DEVMETHOD(device_attach, uart_bus_attach),
61 DEVMETHOD(device_detach, uart_bus_detach),
65 static driver_t uart_pxa_driver = {
68 sizeof(struct uart_softc),
72 uart_pxa_probe(device_t dev)
74 bus_space_handle_t base;
75 struct uart_softc *sc;
77 base = (bus_space_handle_t)pxa_get_base(dev);
78 #ifdef QEMU_WORKAROUNDS
80 * QEMU really exposes only the first uart unless
81 * you specify several of them in the configuration.
82 * Otherwise all the rest of UARTs stay unconnected,
83 * which causes problems in the ns16550 attach routine.
84 * Unfortunately, even if you provide qemu with 4 uarts
85 * on the command line, it has a bug where it segfaults
86 * trying to enable bluetooth on the HWUART. So we just
87 * allow the FFUART to be attached.
88 * Also, don't check the UUE (UART Unit Enable) bit, as
89 * the gumstix bootloader doesn't set it.
91 if (base != PXA2X0_FFUART_BASE)
94 /* Check to see if the enable bit's on. */
95 if ((bus_space_read_4(obio_tag, base,
96 (REG_IER << 2)) & PXA_UART_UUE) == 0)
99 sc = device_get_softc(dev);
100 sc->sc_class = &uart_ns8250_class;
102 return(uart_bus_probe(dev, 2, 0, PXA2X0_COM_FREQ, 0, 0));
105 DRIVER_MODULE(uart, pxa, uart_pxa_driver, uart_devclass, 0, 0);