FreeBSD/Linux Kernel Cross Reference
sys/arm/xscale/ixp425/uart_bus_ixp425.c

     /*-
      * Copyright (c) 2006 Kevin Lo.  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/ic/ns16550.h>
    
    #include <dev/uart/uart.h>
    #include <dev/uart/uart_bus.h>
    #include <dev/uart/uart_cpu.h>
    
    #include <arm/xscale/ixp425/ixp425reg.h>
    #include <arm/xscale/ixp425/ixp425var.h>
    
    #include "uart_if.h"
    
    static int uart_ixp425_probe(device_t dev);
    
    static device_method_t uart_ixp425_methods[] = {
            /* Device interface */
            DEVMETHOD(device_probe,         uart_ixp425_probe),
            DEVMETHOD(device_attach,        uart_bus_attach),
            DEVMETHOD(device_detach,        uart_bus_detach),
            { 0, 0 }
    };
    
    static driver_t uart_ixp425_driver = {
            uart_driver_name,
            uart_ixp425_methods,
            sizeof(struct uart_softc),
    };
    DRIVER_MODULE(uart, ixp, uart_ixp425_driver, uart_devclass, 0, 0);
    
    static int
    uart_ixp425_probe(device_t dev)
    {
            struct uart_softc *sc;
    
            sc = device_get_softc(dev);
            sc->sc_class = &uart_ns8250_class;
            sc->sc_rrid = 0;
            sc->sc_rtype = SYS_RES_MEMORY;
            sc->sc_rres = bus_alloc_resource(dev, sc->sc_rtype, &sc->sc_rrid,
                0, ~0, uart_getrange(sc->sc_class), RF_ACTIVE);
            if (sc->sc_rres == NULL) {
                    return (ENXIO);
            }
            sc->sc_bas.bsh = rman_get_bushandle(sc->sc_rres);
            sc->sc_bas.bst = rman_get_bustag(sc->sc_rres);
            /*
             * XXX set UART Unit Enable (0x40) AND
             *     receiver timeout int enable (0x10).
             * The first turns on the UART.  The second is necessary to get
             * interrupts when the FIFO has data but is not full.  Note that
             * uart_ns8250 carefully avoids touching these bits so we can
             * just set them here and proceed.  But this is fragile...
             */
            bus_space_write_4(sc->sc_bas.bst, sc->sc_bas.bsh, IXP425_UART_IER,
                IXP425_UART_IER_UUE | IXP425_UART_IER_RTOIE);
            bus_release_resource(dev, sc->sc_rtype, sc->sc_rrid, sc->sc_rres);
    
            return uart_bus_probe(dev, 0, IXP425_UART_FREQ, 0, 0);
    }

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