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 extern int late_console;
   48 
   49 int
   50 uart_cpu_eqres(struct uart_bas *b1, struct uart_bas *b2)
   51 {
   52 
   53         return ((b1->bsh == b2->bsh && b1->bst == b2->bst) ? 1 : 0);
   54 }
   55 
   56 int
   57 uart_cpu_getdev(int devtype, struct uart_devinfo *di)
   58 {
   59         struct uart_class *class;
   60         unsigned int i, ivar;
   61 
   62         class = &uart_ns8250_class;
   63         if (class == NULL)
   64                 return (ENXIO);
   65 
   66         /* Check the environment. */
   67         if (uart_getenv(devtype, di, class) == 0)
   68                 return (0);
   69 
   70 #ifdef DEV_ACPI
   71         /*
   72          * Check if SPCR can tell us what console to use.  If running with
   73          * !late_console, we haven't set up our own page tables yet, so we
   74          * can't map ACPI tables to look at them.
   75          */
   76         if (late_console && uart_cpu_acpi_spcr(devtype, di) == 0)
   77                 return (0);
   78 #endif
   79 
   80         /*
   81          * Scan the hints. We only try units 0 to 3 (inclusive). This
   82          * covers the ISA legacy where 4 UARTs had their resources
   83          * predefined.
   84          */
   85         for (i = 0; i < 4; i++) {
   86                 if (resource_int_value("uart", i, "flags", &ivar))
   87                         continue;
   88                 if (devtype == UART_DEV_CONSOLE && !UART_FLAGS_CONSOLE(ivar))
   89                         continue;
   90                 if (devtype == UART_DEV_DBGPORT && !UART_FLAGS_DBGPORT(ivar))
   91                         continue;
   92                 /*
   93                  * We have a possible device. Make sure it's enabled and
   94                  * that we have an I/O port.
   95                  */
   96                 if (resource_int_value("uart", i, "disabled", &ivar) == 0 &&
   97                     ivar != 0)
   98                         continue;
   99                 if (resource_int_value("uart", i, "port", &ivar) != 0 ||
  100                     ivar == 0)
  101                         continue;
  102                 /*
  103                  * Got it. Fill in the instance and return it. We only have
  104                  * ns8250 and successors on i386.
  105                  */
  106                 di->ops = uart_getops(class);
  107                 di->bas.chan = 0;
  108                 di->bas.bst = uart_bus_space_io;
  109                 if (bus_space_map(di->bas.bst, ivar, uart_getrange(class), 0,
  110                     &di->bas.bsh) != 0)
  111                         continue;
  112                 di->bas.regshft = 0;
  113                 di->bas.rclk = 0;
  114                 if (resource_int_value("uart", i, "baud", &ivar) != 0)
  115                         ivar = 0;
  116                 di->baudrate = ivar;
  117                 di->databits = 8;
  118                 di->stopbits = 1;
  119                 di->parity = UART_PARITY_NONE;
  120                 return (0);
  121         }
  122 
  123         return (ENXIO);
  124 }

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FreeBSD/Linux Kernel Cross Reference sys/dev/uart/uart_cpu_x86.c

FreeBSD/Linux Kernel Cross Reference
sys/dev/uart/uart_cpu_x86.c