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/mips/mediatek/fdt_reset.c

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    1 /*-
    2  * Copyright (c) 2016 Stanislav Galabov
    3  * Copyright (c) 2014 Ian Lepore <ian@freebsd.org>
    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  * 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 AND CONTRIBUTORS ``AS IS'' AND
   16  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   17  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   18  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   19  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   20  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   21  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   22  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   23  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   24  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   25  * SUCH DAMAGE.
   26  *
   27  * $FreeBSD: stable/12/sys/mips/mediatek/fdt_reset.c 332341 2018-04-09 22:06:16Z gonzo $
   28  */
   29 
   30 #include <sys/cdefs.h>
   31 #include <sys/param.h>
   32 #include <sys/kernel.h>
   33 #include <sys/lock.h>
   34 #include <sys/mutex.h>
   35 #include <sys/queue.h>
   36 #include <sys/systm.h>
   37 
   38 #include <dev/ofw/ofw_bus.h>
   39 #include <dev/ofw/ofw_bus_subr.h>
   40 
   41 #include "fdt_reset_if.h"
   42 #include <mips/mediatek/fdt_reset.h>
   43 
   44 /*
   45  * Loop through all the tuples in the resets= property for a device, asserting
   46  * or deasserting each reset.
   47  *
   48  * Be liberal about errors for now: warn about a failure to (de)assert but keep
   49  * trying with any other resets in the list.  Return ENXIO if any errors were
   50  * found, and let the caller decide whether the problem is fatal.
   51  */
   52 static int
   53 assert_deassert_all(device_t consumer, boolean_t assert)
   54 {
   55         phandle_t rnode;
   56         device_t resetdev;
   57         int resetnum, err, i, ncells;
   58         uint32_t *resets;
   59         boolean_t anyerrors;
   60 
   61         rnode = ofw_bus_get_node(consumer);
   62         ncells = OF_getencprop_alloc_multi(rnode, "resets", sizeof(*resets),
   63             (void **)&resets);
   64         if (!assert && ncells < 2) {
   65                 device_printf(consumer, "Warning: No resets specified in fdt "
   66                     "data; device may not function.");
   67                 return (ENXIO);
   68         }
   69         anyerrors = false;
   70         for (i = 0; i < ncells; i += 2) {
   71                 resetdev = OF_device_from_xref(resets[i]);
   72                 resetnum = resets[i + 1];
   73                 if (resetdev == NULL) {
   74                         if (!assert)
   75                                 device_printf(consumer, "Warning: can not find "
   76                                     "driver for reset number %u; device may "
   77                                     "not function\n", resetnum);
   78                         anyerrors = true;
   79                         continue;
   80                 }
   81                 if (assert)
   82                         err = FDT_RESET_ASSERT(resetdev, resetnum);
   83                 else
   84                         err = FDT_RESET_DEASSERT(resetdev, resetnum);
   85                 if (err != 0) {
   86                         if (!assert)
   87                                 device_printf(consumer, "Warning: failed to "
   88                                     "deassert reset number %u; device may not "
   89                                     "function\n", resetnum);
   90                         anyerrors = true;
   91                 }
   92         }
   93         OF_prop_free(resets);
   94         return (anyerrors ? ENXIO : 0);
   95 }
   96 
   97 int
   98 fdt_reset_assert_all(device_t consumer)
   99 {
  100 
  101         return (assert_deassert_all(consumer, true));
  102 }
  103 
  104 int
  105 fdt_reset_deassert_all(device_t consumer)
  106 {
  107 
  108         return (assert_deassert_all(consumer, false));
  109 }
  110 
  111 void
  112 fdt_reset_register_provider(device_t provider)
  113 {
  114 
  115         OF_device_register_xref(
  116             OF_xref_from_node(ofw_bus_get_node(provider)), provider);
  117 }
  118 
  119 void
  120 fdt_reset_unregister_provider(device_t provider)
  121 {
  122 
  123         OF_device_register_xref(OF_xref_from_device(provider), NULL);
  124 }
  125 

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