uart_cpu_pc98.c

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    1 /*-
    2  * Copyright (c) 2008 TAKAHASHI Yoshihiro
    3  * Copyright (c) 2003 M. Warner Losh, Marcel Moolenaar
    4  * All rights reserved.
    5  *
    6  * Redistribution and use in source and binary forms, with or without
    7  * modification, are permitted provided that the following conditions
    8  * are met:
    9  *
   10  * 1. Redistributions of source code must retain the above copyright
   11  *    notice, this list of conditions and the following disclaimer.
   12  * 2. Redistributions in binary form must reproduce the above copyright
   13  *    notice, this list of conditions and the following disclaimer in the
   14  *    documentation and/or other materials provided with the distribution.
   15  *
   16  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
   17  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
   18  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
   19  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
   20  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
   21  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
   22  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
   23  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
   24  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
   25  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   26  */
   27 
   28 #include <sys/cdefs.h>
   29 __FBSDID("$FreeBSD$");
   30 
   31 #include <sys/param.h>
   32 #include <sys/systm.h>
   33 #include <sys/bus.h>
   34 
   35 #include <machine/bus.h>
   36 
   37 #include <dev/uart/uart.h>
   38 #include <dev/uart/uart_cpu.h>
   39 
   40 bus_space_tag_t uart_bus_space_io = X86_BUS_SPACE_IO;
   41 bus_space_tag_t uart_bus_space_mem = X86_BUS_SPACE_MEM;
   42 
   43 static struct {
   44         u_long iobase;
   45         struct uart_class *class;
   46 } uart_pc98_devs[] = {
   47         { 0x238, &uart_ns8250_class },
   48         { 0, NULL }
   49 };
   50 
   51 struct uart_class *
   52 uart_pc98_getdev(u_long port)
   53 {
   54         int i;
   55 
   56         for (i = 0; uart_pc98_devs[i].iobase; i++) {
   57                 if (port == uart_pc98_devs[i].iobase)
   58                         return (uart_pc98_devs[i].class);
   59         }
   60         return (NULL);
   61 }
   62 
   63 int
   64 uart_cpu_eqres(struct uart_bas *b1, struct uart_bas *b2)
   65 {
   66 
   67         if (bus_space_compare(b1->bst, b1->bsh, b2->bst, b2->bsh) == 0)
   68                 return (1);
   69 
   70         return (0);
   71 }
   72 
   73 int
   74 uart_cpu_getdev(int devtype, struct uart_devinfo *di)
   75 {
   76         struct uart_class *class;
   77         unsigned int i, ivar;
   78 
   79         class = &uart_ns8250_class;
   80         if (class == NULL)
   81                 return (ENXIO);
   82 
   83         /* Check the environment. */
   84         if (uart_getenv(devtype, di, class) == 0)
   85                 return (0);
   86 
   87         /*
   88          * There is a serial port on all pc98 hardware.  It is 8251 or
   89          * an enhance version of that.  Some pc98 have the second serial
   90          * port which is 16550A compatible.
   91          */
   92         for (i = 0; i < 2; i++) {
   93                 if (resource_int_value("uart", i, "flags", &ivar))
   94                         continue;
   95                 if (devtype == UART_DEV_CONSOLE && !UART_FLAGS_CONSOLE(ivar))
   96                         continue;
   97                 if (devtype == UART_DEV_DBGPORT && !UART_FLAGS_DBGPORT(ivar))
   98                         continue;
   99                 /*
  100                  * We have a possible device. Make sure it's enabled and
  101                  * that we have an I/O port.
  102                  */
  103                 if (resource_int_value("uart", i, "disabled", &ivar) == 0 &&
  104                     ivar != 0)
  105                         continue;
  106                 if (resource_int_value("uart", i, "port", &ivar) != 0 ||
  107                     ivar == 0)
  108                         continue;
  109 
  110                 class = uart_pc98_getdev(ivar);
  111                 if (class == NULL)
  112                         continue;
  113 
  114                 di->ops = uart_getops(class);
  115                 di->bas.chan = 0;
  116                 di->bas.bst = uart_bus_space_io;
  117                 if (bus_space_map(di->bas.bst, ivar, uart_getrange(class), 0,
  118                     &di->bas.bsh) != 0)
  119                         continue;
  120                 di->bas.regshft = 0;
  121                 di->bas.rclk = 0;
  122                 if (resource_int_value("uart", i, "baud", &ivar) != 0)
  123                         ivar = 0;
  124                 di->baudrate = ivar;
  125                 di->databits = 8;
  126                 di->stopbits = 1;
  127                 di->parity = UART_PARITY_NONE;
  128                 return (0);
  129         }
  130 
  131         return (ENXIO);
  132 }

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

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