FreeBSD/Linux Kernel Cross Reference
sys/dev/uart/uart_cpu_pc98.c

     /*-
      * Copyright (c) 2008 TAKAHASHI Yoshihiro
      * Copyright (c) 2003 M. Warner Losh, Marcel Moolenaar
      * 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: releng/8.4/sys/dev/uart/uart_cpu_pc98.c 182837 2008-09-07 04:47:39Z nyan $");
    
    #include <sys/param.h>
    #include <sys/systm.h>
    #include <sys/bus.h>
    
    #include <machine/bus.h>
    
    #include <dev/uart/uart.h>
    #include <dev/uart/uart_cpu.h>
    
    bus_space_tag_t uart_bus_space_io = I386_BUS_SPACE_IO;
    bus_space_tag_t uart_bus_space_mem = I386_BUS_SPACE_MEM;
    
    static struct {
            u_long iobase;
            struct uart_class *class;
    } uart_pc98_devs[] = {
            { 0x238, &uart_ns8250_class },
            { 0, NULL }
    };
    
    struct uart_class *
    uart_pc98_getdev(u_long port)
    {
            int i;
    
            for (i = 0; uart_pc98_devs[i].iobase; i++) {
                    if (port == uart_pc98_devs[i].iobase)
                            return (uart_pc98_devs[i].class);
            }
            return (NULL);
    }
    
    int
    uart_cpu_eqres(struct uart_bas *b1, struct uart_bas *b2)
    {
    
            if (bus_space_compare(b1->bst, b1->bsh, b2->bst, b2->bsh) == 0)
                    return (1);
    
            return (0);
    }
    
    int
    uart_cpu_getdev(int devtype, struct uart_devinfo *di)
    {
            struct uart_class *class;
            unsigned int i, ivar;
    
            class = &uart_ns8250_class;
            if (class == NULL)
                    return (ENXIO);
    
            /* Check the environment. */
            if (uart_getenv(devtype, di, class) == 0)
                    return (0);
    
            /*
             * There is a serial port on all pc98 hardware.  It is 8251 or
             * an enhance version of that.  Some pc98 have the second serial
             * port which is 16550A compatible.
             */
            for (i = 0; i < 2; i++) {
                    if (resource_int_value("uart", i, "flags", &ivar))
                            continue;
                    if (devtype == UART_DEV_CONSOLE && !UART_FLAGS_CONSOLE(ivar))
                            continue;
                    if (devtype == UART_DEV_DBGPORT && !UART_FLAGS_DBGPORT(ivar))
                            continue;
                    /*
                    * We have a possible device. Make sure it's enabled and
                    * that we have an I/O port.
                    */
                   if (resource_int_value("uart", i, "disabled", &ivar) == 0 &&
                       ivar != 0)
                           continue;
                   if (resource_int_value("uart", i, "port", &ivar) != 0 ||
                       ivar == 0)
                           continue;
   
                   class = uart_pc98_getdev(ivar);
                   if (class == NULL)
                           continue;
   
                   di->ops = uart_getops(class);
                   di->bas.chan = 0;
                   di->bas.bst = uart_bus_space_io;
                   if (bus_space_map(di->bas.bst, ivar, uart_getrange(class), 0,
                       &di->bas.bsh) != 0)
                           continue;
                   di->bas.regshft = 0;
                   di->bas.rclk = 0;
                   if (resource_int_value("uart", i, "baud", &ivar) != 0)
                           ivar = 0;
                   di->baudrate = ivar;
                   di->databits = 8;
                   di->stopbits = 1;
                   di->parity = UART_PARITY_NONE;
                   return (0);
           }
   
           return (ENXIO);
   }

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