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: releng/11.0/sys/arm/xscale/pxa/uart_bus_pxa.c 234004 2012-04-07 23:47:08Z stas $");
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
53 static int uart_pxa_probe(device_t dev);
54
55 static 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
63 static driver_t uart_pxa_driver = {
64 uart_driver_name,
65 uart_pxa_methods,
66 sizeof(struct uart_softc),
67 };
68
69 static int
70 uart_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
103 DRIVER_MODULE(uart, pxa, uart_pxa_driver, uart_devclass, 0, 0);
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