sys/dev/fdt/fdt_pinctrl.c

   1 /*-
   2  * Copyright (c) 2014 Ian Lepore <ian@freebsd.org>
   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  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  *
  14  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  15  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  16  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  17  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  18  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  19  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  20  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  21  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  22  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  23  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  24  * SUCH DAMAGE.
  25  *
  26  * $FreeBSD$
  27  */
  28
  29 #include <sys/cdefs.h>
  30 #include <sys/param.h>
  31
  32 #include <dev/ofw/ofw_bus.h>
  33 #include <dev/ofw/ofw_bus_subr.h>
  34
  35 #include "fdt_pinctrl_if.h"
  36
  37 #include <dev/fdt/fdt_common.h>
  38 #include <dev/fdt/fdt_pinctrl.h>
  39
  40 int
  41 fdt_pinctrl_configure(device_t client, u_int index)
  42 {
  43         device_t pinctrl;
  44         phandle_t *configs;
  45         int i, nconfigs;
  46         char name[16];
  47
  48         snprintf(name, sizeof(name), "pinctrl-%u", index);
  49         nconfigs = OF_getencprop_alloc(ofw_bus_get_node(client), name,
  50             sizeof(*configs), (void **)&configs);
  51         if (nconfigs < 0)
  52                 return (ENOENT);
  53         if (nconfigs == 0)
  54                 return (0); /* Empty property is documented as valid. */
  55         for (i = 0; i < nconfigs; i++) {
  56                 if ((pinctrl = OF_device_from_xref(configs[i])) != NULL)
  57                         FDT_PINCTRL_CONFIGURE(pinctrl, configs[i]);
  58         }
  59         free(configs, M_OFWPROP);
  60         return (0);
  61 }
  62
  63 int
  64 fdt_pinctrl_configure_by_name(device_t client, const char * name)
  65 {
  66         char * names;
  67         int i, offset, nameslen;
  68
  69         nameslen = OF_getprop_alloc(ofw_bus_get_node(client), "pinctrl-names",
  70             sizeof(*names), (void **)&names);
  71         if (nameslen <= 0)
  72                 return (ENOENT);
  73         for (i = 0, offset = 0; offset < nameslen; i++) {
  74                 if (strcmp(name, &names[offset]) == 0)
  75                         break;
  76                 offset += strlen(&names[offset]) + 1;
  77         }
  78         free(names, M_OFWPROP);
  79         if (offset < nameslen)
  80                 return (fdt_pinctrl_configure(client, i));
  81         else
  82                 return (ENOENT);
  83 }
  84
  85 static int
  86 pinctrl_register_children(device_t pinctrl, phandle_t parent,
  87     const char *pinprop)
  88 {
  89         phandle_t node;
  90
  91         /*
  92          * Recursively descend from parent, looking for nodes that have the
  93          * given property, and associate the pinctrl device_t with each one.
  94          */
  95         for (node = OF_child(parent); node != 0; node = OF_peer(node)) {
  96                 pinctrl_register_children(pinctrl, node, pinprop);
  97                 if (pinprop == NULL || OF_hasprop(node, pinprop)) {
  98                         OF_device_register_xref(OF_xref_from_node(node),
  99                             pinctrl);
 100                 }
 101         }
 102         return (0);
 103 }
 104
 105 int
 106 fdt_pinctrl_register(device_t pinctrl, const char *pinprop)
 107 {
 108         phandle_t node;
 109
 110         node = ofw_bus_get_node(pinctrl);
 111         OF_device_register_xref(OF_xref_from_node(node), pinctrl);
 112         return (pinctrl_register_children(pinctrl, node, pinprop));
 113 }
 114
 115 static int
 116 pinctrl_configure_children(device_t pinctrl, phandle_t parent)
 117 {
 118         phandle_t node, *configs;
 119         int i, nconfigs;
 120
 121         for (node = OF_child(parent); node != 0; node = OF_peer(node)) {
 122                 if (!fdt_is_enabled(node))
 123                         continue;
 124                 pinctrl_configure_children(pinctrl, node);
 125                 nconfigs = OF_getencprop_alloc(node, "pinctrl-0",
 126                     sizeof(*configs), (void **)&configs);
 127                 if (nconfigs <= 0)
 128                         continue;
 129                 if (bootverbose) {
 130                         char name[32];
 131                         OF_getprop(node, "name", &name, sizeof(name));
 132                         printf("Processing %d pin-config node(s) in pinctrl-0 for %s\n",
 133                             nconfigs, name);
 134                 }
 135                 for (i = 0; i < nconfigs; i++) {
 136                         if (OF_device_from_xref(configs[i]) == pinctrl)
 137                                 FDT_PINCTRL_CONFIGURE(pinctrl, configs[i]);
 138                 }
 139                 free(configs, M_OFWPROP);
 140         }
 141         return (0);
 142 }
 143
 144 int
 145 fdt_pinctrl_configure_tree(device_t pinctrl)
 146 {
 147
 148         return (pinctrl_configure_children(pinctrl, OF_peer(0)));
 149 }
 150