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_x86.c

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    1 /*-
    2  * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
    3  *
    4  * Copyright (c) 2003, 2004 Marcel Moolenaar
    5  * All rights reserved.
    6  *
    7  * Redistribution and use in source and binary forms, with or without
    8  * modification, are permitted provided that the following conditions
    9  * are met:
   10  *
   11  * 1. Redistributions of source code must retain the above copyright
   12  *    notice, this list of conditions and the following disclaimer.
   13  * 2. Redistributions in binary form must reproduce the above copyright
   14  *    notice, this list of conditions and the following disclaimer in the
   15  *    documentation and/or other materials provided with the distribution.
   16  *
   17  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
   18  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
   19  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
   20  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
   21  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
   22  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
   23  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
   24  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
   25  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
   26  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   27  */
   28 
   29 #include "opt_acpi.h"
   30 
   31 #include <sys/cdefs.h>
   32 __FBSDID("$FreeBSD$");
   33 
   34 #include <sys/param.h>
   35 #include <sys/systm.h>
   36 #include <sys/bus.h>
   37 
   38 #include <machine/bus.h>
   39 
   40 #include <dev/uart/uart.h>
   41 #include <dev/uart/uart_cpu.h>
   42 #include <dev/uart/uart_cpu_acpi.h>
   43 
   44 bus_space_tag_t uart_bus_space_io = X86_BUS_SPACE_IO;
   45 bus_space_tag_t uart_bus_space_mem = X86_BUS_SPACE_MEM;
   46 
   47 int
   48 uart_cpu_eqres(struct uart_bas *b1, struct uart_bas *b2)
   49 {
   50 
   51         return ((b1->bsh == b2->bsh && b1->bst == b2->bst) ? 1 : 0);
   52 }
   53 
   54 int
   55 uart_cpu_getdev(int devtype, struct uart_devinfo *di)
   56 {
   57         struct uart_class *class;
   58         unsigned int i, ivar;
   59 
   60         class = &uart_ns8250_class;
   61         if (class == NULL)
   62                 return (ENXIO);
   63 
   64         /* Check the environment. */
   65         if (uart_getenv(devtype, di, class) == 0)
   66                 return (0);
   67 
   68 #ifdef DEV_ACPI
   69         /* Check if SPCR can tell us what console to use. */
   70         if (uart_cpu_acpi_spcr(devtype, di) == 0)
   71                 return (0);
   72 #endif
   73 
   74         /*
   75          * Scan the hints. We only try units 0 to 3 (inclusive). This
   76          * covers the ISA legacy where 4 UARTs had their resources
   77          * predefined.
   78          */
   79         for (i = 0; i < 4; i++) {
   80                 if (resource_int_value("uart", i, "flags", &ivar))
   81                         continue;
   82                 if (devtype == UART_DEV_CONSOLE && !UART_FLAGS_CONSOLE(ivar))
   83                         continue;
   84                 if (devtype == UART_DEV_DBGPORT && !UART_FLAGS_DBGPORT(ivar))
   85                         continue;
   86                 /*
   87                  * We have a possible device. Make sure it's enabled and
   88                  * that we have an I/O port.
   89                  */
   90                 if (resource_int_value("uart", i, "disabled", &ivar) == 0 &&
   91                     ivar != 0)
   92                         continue;
   93                 if (resource_int_value("uart", i, "port", &ivar) != 0 ||
   94                     ivar == 0)
   95                         continue;
   96                 /*
   97                  * Got it. Fill in the instance and return it. We only have
   98                  * ns8250 and successors on i386.
   99                  */
  100                 di->ops = uart_getops(class);
  101                 di->bas.chan = 0;
  102                 di->bas.bst = uart_bus_space_io;
  103                 if (bus_space_map(di->bas.bst, ivar, uart_getrange(class), 0,
  104                     &di->bas.bsh) != 0)
  105                         continue;
  106                 di->bas.regshft = 0;
  107                 di->bas.rclk = 0;
  108                 if (resource_int_value("uart", i, "baud", &ivar) != 0)
  109                         ivar = 0;
  110                 di->baudrate = ivar;
  111                 di->databits = 8;
  112                 di->stopbits = 1;
  113                 di->parity = UART_PARITY_NONE;
  114                 return (0);
  115         }
  116 
  117         return (ENXIO);
  118 }

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