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/pxa/uart_bus_pxa.c

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    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/8.0/sys/arm/xscale/pxa/uart_bus_pxa.c 179595 2008-06-06 05:08:09Z benno $");
   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         /* Check to see if the enable bit's on. */
   76         base = (bus_space_handle_t)pxa_get_base(dev);
   77         if ((bus_space_read_4(obio_tag, base,
   78             (REG_IER << 2)) & PXA_UART_UUE) == 0)
   79                 return (ENXIO);
   80 
   81         sc = device_get_softc(dev);
   82         sc->sc_class = &uart_ns8250_class;
   83 
   84         return(uart_bus_probe(dev, 2, PXA2X0_COM_FREQ, 0, 0));
   85 }
   86 
   87 DRIVER_MODULE(uart, pxa, uart_pxa_driver, uart_devclass, 0, 0);

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