The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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

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    1 /*-
    2  * Copyright (c) 2006 Kevin Lo.  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/6.4/sys/arm/xscale/ixp425/uart_bus_ixp425.c 167038 2007-02-26 23:13:09Z cognet $");
   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 #include <dev/ic/ns16550.h>
   40 
   41 #include <dev/uart/uart.h>
   42 #include <dev/uart/uart_bus.h>
   43 #include <dev/uart/uart_cpu.h>
   44 
   45 #include <arm/xscale/ixp425/ixp425reg.h>
   46 #include <arm/xscale/ixp425/ixp425var.h>
   47 
   48 #include "uart_if.h"
   49 
   50 static int uart_ixp425_probe(device_t dev);
   51 
   52 static device_method_t uart_ixp425_methods[] = {
   53         /* Device interface */
   54         DEVMETHOD(device_probe,         uart_ixp425_probe),
   55         DEVMETHOD(device_attach,        uart_bus_attach),
   56         DEVMETHOD(device_detach,        uart_bus_detach),
   57         { 0, 0 }
   58 };
   59 
   60 static driver_t uart_ixp425_driver = {
   61         uart_driver_name,
   62         uart_ixp425_methods,
   63         sizeof(struct uart_softc),
   64 };
   65 
   66 extern SLIST_HEAD(uart_devinfo_list, uart_devinfo) uart_sysdevs;
   67 static int
   68 uart_ixp425_probe(device_t dev)
   69 {
   70         struct uart_softc *sc;
   71 
   72         sc = device_get_softc(dev);
   73         sc->sc_sysdev = SLIST_FIRST(&uart_sysdevs);
   74         sc->sc_class = &uart_ns8250_class;
   75         bcopy(&sc->sc_sysdev->bas, &sc->sc_bas, sizeof(sc->sc_bas));
   76         /*
   77          * XXX set UART Unit Enable (0x40) AND
   78          *     receiver timeout int enable (0x10).
   79          * The first turns on the UART.  The second is necessary to get
   80          * interrupts when the FIFO has data but is not full.  Note that
   81          * uart_ns8250 carefully avoids touching these bits so we can
   82          * just set them here and proceed.  But this is fragile...
   83          */
   84         bus_space_write_4(&ixp425_a4x_bs_tag,
   85             device_get_unit(dev) == 0 ? IXP425_UART0_VBASE : IXP425_UART1_VBASE,
   86             IXP425_UART_IER, IXP425_UART_IER_UUE | IXP425_UART_IER_RTOIE);
   87         return(uart_bus_probe(dev, 0, IXP425_UART_FREQ, 0, 0));
   88 }
   89 
   90 
   91 DRIVER_MODULE(uart, ixp, uart_ixp425_driver, uart_devclass, 0, 0);

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