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/dev/uart/uart_cpu_i386.c

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    1 /*-
    2  * Copyright (c) 2003, 2004 Marcel Moolenaar
    3  * All rights reserved.
    4  *
    5  * Redistribution and use in source and binary forms, with or without
    6  * modification, are permitted provided that the following conditions
    7  * are met:
    8  *
    9  * 1. Redistributions of source code must retain the above copyright
   10  *    notice, this list of conditions and the following disclaimer.
   11  * 2. Redistributions in binary form must reproduce the above copyright
   12  *    notice, this list of conditions and the following disclaimer in the
   13  *    documentation and/or other materials provided with the distribution.
   14  *
   15  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
   16  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
   17  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
   18  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
   19  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
   20  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
   21  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
   22  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
   23  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
   24  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   25  */
   26 
   27 #include <sys/cdefs.h>
   28 __FBSDID("$FreeBSD: releng/8.4/sys/dev/uart/uart_cpu_i386.c 168281 2007-04-02 22:00:22Z marcel $");
   29 
   30 #include <sys/param.h>
   31 #include <sys/systm.h>
   32 #include <sys/bus.h>
   33 
   34 #include <machine/bus.h>
   35 
   36 #include <dev/uart/uart.h>
   37 #include <dev/uart/uart_cpu.h>
   38 
   39 bus_space_tag_t uart_bus_space_io = I386_BUS_SPACE_IO;
   40 bus_space_tag_t uart_bus_space_mem = I386_BUS_SPACE_MEM;
   41 
   42 int
   43 uart_cpu_eqres(struct uart_bas *b1, struct uart_bas *b2)
   44 {
   45 
   46         return ((b1->bsh == b2->bsh && b1->bst == b2->bst) ? 1 : 0);
   47 }
   48 
   49 int
   50 uart_cpu_getdev(int devtype, struct uart_devinfo *di)
   51 {
   52         struct uart_class *class;
   53         unsigned int i, ivar;
   54 
   55         class = &uart_ns8250_class;
   56         if (class == NULL)
   57                 return (ENXIO);
   58 
   59         /* Check the environment. */
   60         if (uart_getenv(devtype, di, class) == 0)
   61                 return (0);
   62 
   63         /*
   64          * Scan the hints. We only try units 0 to 3 (inclusive). This
   65          * covers the ISA legacy where 4 UARTs had their resources
   66          * predefined.
   67          */
   68         for (i = 0; i < 4; i++) {
   69                 if (resource_int_value("uart", i, "flags", &ivar))
   70                         continue;
   71                 if (devtype == UART_DEV_CONSOLE && !UART_FLAGS_CONSOLE(ivar))
   72                         continue;
   73                 if (devtype == UART_DEV_DBGPORT && !UART_FLAGS_DBGPORT(ivar))
   74                         continue;
   75                 /*
   76                  * We have a possible device. Make sure it's enabled and
   77                  * that we have an I/O port.
   78                  */
   79                 if (resource_int_value("uart", i, "disabled", &ivar) == 0 &&
   80                     ivar != 0)
   81                         continue;
   82                 if (resource_int_value("uart", i, "port", &ivar) != 0 ||
   83                     ivar == 0)
   84                         continue;
   85                 /*
   86                  * Got it. Fill in the instance and return it. We only have
   87                  * ns8250 and successors on i386.
   88                  */
   89                 di->ops = uart_getops(class);
   90                 di->bas.chan = 0;
   91                 di->bas.bst = uart_bus_space_io;
   92                 if (bus_space_map(di->bas.bst, ivar, uart_getrange(class), 0,
   93                     &di->bas.bsh) != 0)
   94                         continue;
   95                 di->bas.regshft = 0;
   96                 di->bas.rclk = 0;
   97                 if (resource_int_value("uart", i, "baud", &ivar) != 0)
   98                         ivar = 0;
   99                 di->baudrate = ivar;
  100                 di->databits = 8;
  101                 di->stopbits = 1;
  102                 di->parity = UART_PARITY_NONE;
  103                 return (0);
  104         }
  105 
  106         return (ENXIO);
  107 }

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