FreeBSD/Linux Kernel Cross Reference
sys/arm/xscale/pxa/uart_bus_pxa.c

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

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