208cf1fbc3
used in the code which needs to implement some specific behaviour when being run under QEMU. - Make PXA UART probe code to work under QEMU gumstix, which doesn't emulate all the ports properly.
104 lines
3.3 KiB
C
104 lines
3.3 KiB
C
/*-
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* Copyright (c) 2006 Benno Rice. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/bus.h>
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#include <sys/conf.h>
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#include <sys/kernel.h>
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#include <sys/module.h>
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#include <machine/bus.h>
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#include <sys/rman.h>
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#include <machine/resource.h>
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#include <dev/pci/pcivar.h>
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#include <dev/uart/uart.h>
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#include <dev/uart/uart_bus.h>
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#include <dev/uart/uart_cpu.h>
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#include <dev/ic/ns16550.h>
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#include <arm/xscale/pxa/pxavar.h>
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#include <arm/xscale/pxa/pxareg.h>
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#include "uart_if.h"
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#define PXA_UART_UUE 0x40 /* UART Unit Enable */
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static int uart_pxa_probe(device_t dev);
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static device_method_t uart_pxa_methods[] = {
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/* Device interface */
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DEVMETHOD(device_probe, uart_pxa_probe),
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DEVMETHOD(device_attach, uart_bus_attach),
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DEVMETHOD(device_detach, uart_bus_detach),
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{ 0, 0 }
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};
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static driver_t uart_pxa_driver = {
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uart_driver_name,
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uart_pxa_methods,
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sizeof(struct uart_softc),
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};
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static int
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uart_pxa_probe(device_t dev)
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{
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bus_space_handle_t base;
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struct uart_softc *sc;
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base = (bus_space_handle_t)pxa_get_base(dev);
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#ifdef QEMU_WORKAROUNDS
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/*
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* QEMU really exposes only the first uart unless
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* you specify several of them in the configuration.
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* Otherwise all the rest of UARTs stay unconnected,
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* which causes problems in the ns16550 attach routine.
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* Unfortunately, even if you provide qemu with 4 uarts
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* on the command line, it has a bug where it segfaults
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* trying to enable bluetooth on the HWUART. So we just
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* allow the FFUART to be attached.
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* Also, don't check the UUE (UART Unit Enable) bit, as
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* the gumstix bootloader doesn't set it.
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*/
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if (base != PXA2X0_FFUART_BASE)
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return (ENXIO);
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#else
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/* Check to see if the enable bit's on. */
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if ((bus_space_read_4(obio_tag, base,
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(REG_IER << 2)) & PXA_UART_UUE) == 0)
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return (ENXIO);
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#endif
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sc = device_get_softc(dev);
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sc->sc_class = &uart_ns8250_class;
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return(uart_bus_probe(dev, 2, PXA2X0_COM_FREQ, 0, 0));
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}
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DRIVER_MODULE(uart, pxa, uart_pxa_driver, uart_devclass, 0, 0);
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