hwreset_array.c

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    1 /*-
    2  * Copyright (c) 2022 The FreeBSD Foundation
    3  *
    4  * This software was developed by Andrew Turner under sponsorship from
    5  * the FreeBSD Foundation.
    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  * 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 AND CONTRIBUTORS ``AS IS'' AND
   17  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   18  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   19  * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   20  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   21  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   22  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   23  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   24  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   25  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   26  * SUCH DAMAGE.
   27  */
   28 
   29 /*
   30  * This manages all hwresets for a device and asserts/deasserts them in
   31  * an undefined order.
   32  */
   33 
   34 #include "opt_platform.h"
   35 #include <sys/cdefs.h>
   36 #include <sys/param.h>
   37 #include <sys/malloc.h>
   38 
   39 #ifdef FDT
   40 #include <dev/ofw/ofw_bus.h>
   41 #include <dev/ofw/ofw_bus_subr.h>
   42 #endif
   43 
   44 #include <dev/extres/hwreset/hwreset.h>
   45 
   46 MALLOC_DECLARE(M_HWRESET);
   47 
   48 struct hwreset_array {
   49         hwreset_t *rst_array;
   50         int     count;
   51 };
   52 
   53 int
   54 hwreset_array_assert(hwreset_array_t rsts)
   55 {
   56         int i, rv;
   57 
   58         for (i = 0; i < rsts->count; i++) {
   59                 rv = hwreset_assert(rsts->rst_array[i]);
   60                 if (rv != 0)
   61                         return (rv);
   62         }
   63 
   64         return (0);
   65 }
   66 
   67 int
   68 hwreset_array_deassert(hwreset_array_t rsts)
   69 {
   70         int i, rv;
   71 
   72         for (i = 0; i < rsts->count; i++) {
   73                 rv = hwreset_deassert(rsts->rst_array[i]);
   74                 if (rv != 0)
   75                         return (rv);
   76         }
   77 
   78         return (0);
   79 }
   80 
   81 void
   82 hwreset_array_release(hwreset_array_t rsts)
   83 {
   84         int i;
   85 
   86         for (i = 0; i < rsts->count; i++) {
   87                 hwreset_release(rsts->rst_array[i]);
   88         }
   89         free(rsts->rst_array, M_HWRESET);
   90         free(rsts, M_HWRESET);
   91 }
   92 
   93 #ifdef FDT
   94 int
   95 hwreset_array_get_ofw(device_t consumer_dev, phandle_t cnode,
   96     hwreset_array_t *rsts)
   97 {
   98         hwreset_array_t resets;
   99         int count, i, rv;
  100 
  101         if (cnode <= 0)
  102                 cnode = ofw_bus_get_node(consumer_dev);
  103         if (cnode <= 0) {
  104                 device_printf(consumer_dev,
  105                     "%s called on not ofw based device\n", __func__);
  106                 return (ENXIO);
  107         }
  108 
  109         rv = ofw_bus_parse_xref_list_get_length(cnode, "resets", "#reset-cells",
  110             &count);
  111         if (rv != 0)
  112                 return (rv);
  113 
  114         resets = malloc(sizeof(struct hwreset_array), M_HWRESET,
  115             M_WAITOK | M_ZERO);
  116         resets->rst_array = mallocarray(count, sizeof(hwreset_t), M_HWRESET,
  117             M_WAITOK | M_ZERO);
  118 
  119         for (i = 0; i < count; i++) {
  120                 rv = hwreset_get_by_ofw_idx(consumer_dev, cnode, i,
  121                     &resets->rst_array[i]);
  122                 if (rv != 0)
  123                         break;
  124         }
  125 
  126         if (rv != 0) {
  127                 count = i;
  128                 for (i = 0; i < count; i++) {
  129                         hwreset_release(resets->rst_array[i]);
  130                 }
  131                 free(resets->rst_array, M_HWRESET);
  132                 free(resets, M_HWRESET);
  133         } else {
  134                 resets->count = count;
  135                 *rsts = resets;
  136         }
  137         return (rv);
  138 }
  139 #endif

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FreeBSD/Linux Kernel Cross Reference sys/dev/extres/hwreset/hwreset_array.c

FreeBSD/Linux Kernel Cross Reference
sys/dev/extres/hwreset/hwreset_array.c