uart_cpu_pc98.c

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    1 /*-
    2  * Copyright (c) 2003 M. Warner Losh, 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("$FreeBSD$");
   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 (0);             /* XXX */
   47 }
   48 
   49 int
   50 uart_cpu_getdev(int devtype, struct uart_devinfo *di)
   51 {
   52         unsigned int i, ivar, flags;
   53 
   54         /* Check the environment. */
   55         if (uart_getenv(devtype, di) == 0)
   56                 return (0);
   57 
   58         /*
   59          * There is a serial port on all pc98 hardware.  It is 8251 or
   60          * an enhance version of that.  Some pc98 have the second serial
   61          * port which is 16550A compatible.  However, for the sio driver,
   62          * flags selected which type of uart was in the sytem.  We use
   63          * something similar to sort things out.
   64          */
   65         for (i = 0; i < 1; i++) {
   66                 if (resource_int_value("uart", i, "flags", &flags))
   67                         continue;
   68                 if (devtype == UART_DEV_CONSOLE && !UART_FLAGS_CONSOLE(flags))
   69                         continue;
   70                 if (devtype == UART_DEV_DBGPORT && !UART_FLAGS_DBGPORT(flags))
   71                         continue;
   72                 /*
   73                  * We have a possible device. Make sure it's enabled and
   74                  * that we have an I/O port.
   75                  */
   76                 if (resource_int_value("uart", i, "disabled", &ivar) == 0 &&
   77                     ivar != 0)
   78                         continue;
   79                 if (resource_int_value("uart", i, "port", &ivar) != 0 ||
   80                     ivar == 0)
   81                         continue;
   82                 /*
   83                  * Got it. Fill in the instance and return it. We have
   84                  * both i8251 an ns8250 and successors on pc98.
   85                  */
   86                 if (flags & 0x100)
   87                         di->ops = uart_ns8250_ops;
   88                 else
   89                         di->ops = uart_i8251_ops;
   90                 di->bas.chan = 0;
   91                 di->bas.bst = uart_bus_space_io;
   92                 if (bus_space_map(di->bas.bst, ivar, 8, 0, &di->bas.bsh) != 0)
   93                         continue;
   94                 di->bas.regshft = 0;
   95                 di->bas.rclk = 0;
   96                 if (resource_int_value("uart", i, "baud", &ivar) != 0)
   97                         ivar = 0;
   98                 di->baudrate = ivar;
   99                 di->databits = 8;
  100                 di->stopbits = 1;
  101                 di->parity = UART_PARITY_NONE;
  102                 return (0);
  103         }
  104 
  105         return (ENXIO);
  106 }
  107 
  108 void
  109 uart_cpu_identify(driver_t *driver, device_t parent)
  110 {
  111  
  112 }

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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