uart_cpu_powerpc.c

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    1 /*-
    2  * Copyright (c) 2006 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 <vm/vm.h>
   33 #include <vm/pmap.h>
   34 
   35 #include <machine/bus.h>
   36 #include <machine/ofw_machdep.h>
   37 
   38 #include <dev/ofw/openfirm.h>
   39 #include <dev/uart/uart.h>
   40 #include <dev/uart/uart_cpu.h>
   41 
   42 bus_space_tag_t uart_bus_space_io = &bs_le_tag;
   43 bus_space_tag_t uart_bus_space_mem = &bs_le_tag;
   44 
   45 int
   46 uart_cpu_eqres(struct uart_bas *b1, struct uart_bas *b2)
   47 {
   48 
   49         return ((pmap_kextract(b1->bsh) == pmap_kextract(b2->bsh)) ? 1 : 0);
   50 }
   51 
   52 static int
   53 ofw_get_uart_console(phandle_t opts, phandle_t *result, const char *inputdev,
   54     const char *outputdev)
   55 {
   56         char buf[64];
   57         phandle_t input;
   58 
   59         if (OF_getprop(opts, inputdev, buf, sizeof(buf)) == -1)
   60                 return (ENXIO);
   61         input = OF_finddevice(buf);
   62         if (input == -1)
   63                 return (ENXIO);
   64         if (OF_getprop(opts, outputdev, buf, sizeof(buf)) == -1)
   65                 return (ENXIO);
   66         if (OF_finddevice(buf) != input)
   67                 return (ENXIO);
   68 
   69         *result = input;
   70         return (0);
   71 }
   72 
   73 int
   74 uart_cpu_getdev(int devtype, struct uart_devinfo *di)
   75 {
   76         char buf[64];
   77         struct uart_class *class;
   78         phandle_t input, opts;
   79         int error;
   80 
   81         class = &uart_z8530_class;
   82         if (class == NULL)
   83                 return (ENXIO);
   84 
   85         if ((opts = OF_finddevice("/options")) == -1)
   86                 return (ENXIO);
   87         switch (devtype) {
   88         case UART_DEV_CONSOLE:
   89                 if (ofw_get_uart_console(opts, &input, "input-device",
   90                     "output-device")) {
   91                         /*
   92                          * At least some G5 Xserves require that we
   93                          * probe input-device-1 as well
   94                          */
   95         
   96                         if (ofw_get_uart_console(opts, &input, "input-device-1",
   97                             "output-device-1"))
   98                                 return (ENXIO);
   99                 }
  100                 break;
  101         case UART_DEV_DBGPORT:
  102                 if (!getenv_string("hw.uart.dbgport", buf, sizeof(buf)))
  103                         return (ENXIO);
  104                 input = OF_finddevice(buf);
  105                 if (input == -1)
  106                         return (ENXIO);
  107                 break;
  108         default:
  109                 return (EINVAL);
  110         }
  111 
  112         if (OF_getprop(input, "device_type", buf, sizeof(buf)) == -1)
  113                 return (ENXIO);
  114         if (strcmp(buf, "serial") != 0)
  115                 return (ENXIO);
  116         if (OF_getprop(input, "name", buf, sizeof(buf)) == -1)
  117                 return (ENXIO);
  118 
  119         if (strcmp(buf, "ch-a") == 0) {
  120                 class = &uart_z8530_class;
  121                 di->bas.regshft = 4;
  122                 di->bas.chan = 1;
  123         } else if (strcmp(buf,"serial") == 0) {
  124                 class = &uart_ns8250_class;
  125                 di->bas.regshft = 0;
  126                 di->bas.chan = 0;
  127         } else
  128                 return (ENXIO);
  129 
  130         error = OF_decode_addr(input, 0, &di->bas.bst, &di->bas.bsh);
  131         if (error)
  132                 return (error);
  133 
  134         di->ops = uart_getops(class);
  135 
  136         if (OF_getprop(input, "clock-frequency", &di->bas.rclk, 
  137             sizeof(di->bas.rclk)) == -1)
  138                 di->bas.rclk = 230400;
  139         if (OF_getprop(input, "current-speed", &di->baudrate, 
  140             sizeof(di->baudrate)) == -1)
  141                 di->baudrate = 0;
  142 
  143         di->databits = 8;
  144         di->stopbits = 1;
  145         di->parity = UART_PARITY_NONE;
  146         return (0);
  147 }

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

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