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_powerpc.c

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    1 /*-
    2  * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
    3  *
    4  * Copyright (c) 2006 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 <sys/cdefs.h>
   30 __FBSDID("$FreeBSD$");
   31 
   32 #include <sys/param.h>
   33 #include <sys/systm.h>
   34 #include <vm/vm.h>
   35 #include <vm/pmap.h>
   36 
   37 #include <machine/bus.h>
   38 #include <machine/ofw_machdep.h>
   39 
   40 #include <dev/ofw/ofw_bus_subr.h>
   41 #include <dev/ofw/openfirm.h>
   42 #include <dev/uart/uart.h>
   43 #include <dev/uart/uart_cpu.h>
   44 
   45 bus_space_tag_t uart_bus_space_io = &bs_le_tag;
   46 bus_space_tag_t uart_bus_space_mem = &bs_le_tag;
   47 
   48 int
   49 uart_cpu_eqres(struct uart_bas *b1, struct uart_bas *b2)
   50 {
   51 
   52         return ((pmap_kextract(b1->bsh) == pmap_kextract(b2->bsh)) ? 1 : 0);
   53 }
   54 
   55 static int
   56 ofw_get_uart_console(phandle_t opts, phandle_t *result, const char *inputdev,
   57     const char *outputdev)
   58 {
   59         char buf[64];
   60         phandle_t input;
   61 
   62         if (OF_getprop(opts, inputdev, buf, sizeof(buf)) == -1)
   63                 return (ENXIO);
   64         input = OF_finddevice(buf);
   65         if (input == -1)
   66                 return (ENXIO);
   67 
   68         if (outputdev != NULL) {
   69                 if (OF_getprop(opts, outputdev, buf, sizeof(buf)) == -1)
   70                         return (ENXIO);
   71                 if (OF_finddevice(buf) != input)
   72                         return (ENXIO);
   73         }
   74 
   75         *result = input;
   76         return (0);
   77 }
   78 
   79 static int
   80 ofw_get_console_phandle_path(phandle_t node, phandle_t *result,
   81     const char *prop)
   82 {
   83         union {
   84                 char buf[64];
   85                 phandle_t ref;
   86         } field;
   87         phandle_t output;
   88         ssize_t size;
   89 
   90         size = OF_getproplen(node, prop);
   91         if (size == -1)
   92                 return (ENXIO);
   93         OF_getprop(node, prop, &field, sizeof(field));
   94 
   95         /* This property might be either a ihandle or path. Hooray. */
   96 
   97         output = -1;
   98         if (field.buf[size - 1] == 0)
   99                 output = OF_finddevice(field.buf);
  100         if (output == -1 && size == 4)
  101                 output = OF_instance_to_package(field.ref);
  102 
  103         if (output != -1) {
  104                 *result = output;
  105                 return (0);
  106         }
  107 
  108         return (ENXIO);
  109 }
  110 
  111 int
  112 uart_cpu_getdev(int devtype, struct uart_devinfo *di)
  113 {
  114         char buf[64];
  115         struct uart_class *class;
  116         phandle_t input, opts, chosen;
  117         int error;
  118 
  119         opts = OF_finddevice("/options");
  120         chosen = OF_finddevice("/chosen");
  121         switch (devtype) {
  122         case UART_DEV_CONSOLE:
  123                 error = ENXIO;
  124                 if (chosen != -1 && error != 0)
  125                         error = ofw_get_uart_console(chosen, &input,
  126                             "stdout-path", NULL);
  127                 if (chosen != -1 && error != 0)
  128                         error = ofw_get_uart_console(chosen, &input,
  129                             "linux,stdout-path", NULL);
  130                 if (chosen != -1 && error != 0)
  131                         error = ofw_get_console_phandle_path(chosen, &input,
  132                             "stdout");
  133                 if (chosen != -1 && error != 0)
  134                         error = ofw_get_uart_console(chosen, &input,
  135                             "stdin-path", NULL);
  136                 if (chosen != -1 && error != 0)
  137                         error = ofw_get_console_phandle_path(chosen, &input,
  138                             "stdin");
  139                 if (opts != -1 && error != 0)
  140                         error = ofw_get_uart_console(opts, &input,
  141                             "input-device", "output-device");
  142                 if (opts != -1 && error != 0)
  143                         error = ofw_get_uart_console(opts, &input,
  144                             "input-device-1", "output-device-1");
  145                 if (error != 0) {
  146                         input = OF_finddevice("serial0"); /* Last ditch */
  147                         if (input == -1)
  148                                 error = (ENXIO);
  149                 }
  150 
  151                 if (error != 0)
  152                         return (error);
  153                 break;
  154         case UART_DEV_DBGPORT:
  155                 if (!getenv_string("hw.uart.dbgport", buf, sizeof(buf)))
  156                         return (ENXIO);
  157                 input = OF_finddevice(buf);
  158                 if (input == -1)
  159                         return (ENXIO);
  160                 break;
  161         default:
  162                 return (EINVAL);
  163         }
  164 
  165         if (OF_getprop(input, "device_type", buf, sizeof(buf)) == -1)
  166                 return (ENXIO);
  167         if (strcmp(buf, "serial") != 0)
  168                 return (ENXIO);
  169 
  170         if (ofw_bus_node_is_compatible(input, "chrp,es")) {
  171                 class = &uart_z8530_class;
  172                 di->bas.regshft = 4;
  173                 di->bas.chan = 1;
  174         } else if (ofw_bus_node_is_compatible(input,"ns16550") ||
  175             ofw_bus_node_is_compatible(input,"ns8250")) {
  176                 class = &uart_ns8250_class;
  177                 di->bas.regshft = 0;
  178                 di->bas.chan = 0;
  179         } else
  180                 return (ENXIO);
  181 
  182         if (class == NULL)
  183                 return (ENXIO);
  184 
  185         error = OF_decode_addr(input, 0, &di->bas.bst, &di->bas.bsh, NULL);
  186         if (error)
  187                 return (error);
  188 
  189         di->ops = uart_getops(class);
  190 
  191         if (OF_getprop(input, "clock-frequency", &di->bas.rclk, 
  192             sizeof(di->bas.rclk)) == -1)
  193                 di->bas.rclk = 230400;
  194         if (OF_getprop(input, "current-speed", &di->baudrate, 
  195             sizeof(di->baudrate)) == -1)
  196                 di->baudrate = 0;
  197         OF_getprop(input, "reg-shift", &di->bas.regshft,
  198             sizeof(di->bas.regshft));
  199 
  200         di->databits = 8;
  201         di->stopbits = 1;
  202         di->parity = UART_PARITY_NONE;
  203         return (0);
  204 }

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