FreeBSD/Linux Kernel Cross Reference
sys/dev/fdt/fdt_pinctrl.c

     /*-
      * Copyright (c) 2014 Ian Lepore <ian@freebsd.org>
      * All rights reserved.
      *
      * Redistribution and use in source and binary forms, with or without
      * modification, are permitted provided that the following conditions
      * are met:
      * 1. Redistributions of source code must retain the above copyright
      *    notice, this list of conditions and the following disclaimer.
     * 2. Redistributions in binary form must reproduce the above copyright
     *    notice, this list of conditions and the following disclaimer in the
     *    documentation and/or other materials provided with the distribution.
     *
     * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
     * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
     * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     * SUCH DAMAGE.
     *
     * $FreeBSD$
     */
    
    #include <sys/cdefs.h>
    #include <sys/param.h>
    
    #include <dev/ofw/ofw_bus.h>
    #include <dev/ofw/ofw_bus_subr.h>
    
    #include "fdt_pinctrl_if.h"
    
    #include <dev/fdt/fdt_common.h>
    #include <dev/fdt/fdt_pinctrl.h>
    
    int
    fdt_pinctrl_configure(device_t client, u_int index)
    {
            device_t pinctrl;
            phandle_t *configs;
            int i, nconfigs;
            char name[16];
    
            snprintf(name, sizeof(name), "pinctrl-%u", index);
            nconfigs = OF_getencprop_alloc_multi(ofw_bus_get_node(client), name,
                sizeof(*configs), (void **)&configs);
            if (nconfigs < 0)
                    return (ENOENT);
            if (nconfigs == 0)
                    return (0); /* Empty property is documented as valid. */
            for (i = 0; i < nconfigs; i++) {
                    if ((pinctrl = OF_device_from_xref(configs[i])) != NULL)
                            FDT_PINCTRL_CONFIGURE(pinctrl, configs[i]);
            }
            OF_prop_free(configs);
            return (0);
    }
    
    int
    fdt_pinctrl_configure_by_name(device_t client, const char * name)
    {
            char * names;
            int i, offset, nameslen;
    
            nameslen = OF_getprop_alloc(ofw_bus_get_node(client), "pinctrl-names",
                (void **)&names);
            if (nameslen <= 0)
                    return (ENOENT);
            for (i = 0, offset = 0; offset < nameslen; i++) {
                    if (strcmp(name, &names[offset]) == 0)
                            break;
                    offset += strlen(&names[offset]) + 1;
            }
            OF_prop_free(names);
            if (offset < nameslen)
                    return (fdt_pinctrl_configure(client, i));
            else
                    return (ENOENT);
    }
    
    static int
    pinctrl_register_children(device_t pinctrl, phandle_t parent,
        const char *pinprop)
    {
            phandle_t node;
    
            /*
             * Recursively descend from parent, looking for nodes that have the
             * given property, and associate the pinctrl device_t with each one.
             */
            for (node = OF_child(parent); node != 0; node = OF_peer(node)) {
                    pinctrl_register_children(pinctrl, node, pinprop);
                    if (pinprop == NULL || OF_hasprop(node, pinprop)) {
                            OF_device_register_xref(OF_xref_from_node(node),
                                pinctrl);
                   }
           }
           return (0);
   }
   
   int
   fdt_pinctrl_register(device_t pinctrl, const char *pinprop)
   {
           phandle_t node;
           int ret;
   
           TSENTER();
           node = ofw_bus_get_node(pinctrl);
           OF_device_register_xref(OF_xref_from_node(node), pinctrl);
           ret = pinctrl_register_children(pinctrl, node, pinprop);
           TSEXIT();
   
           return (ret);
   }
   
   static int
   pinctrl_configure_children(device_t pinctrl, phandle_t parent)
   {
           phandle_t node, *configs;
           int i, nconfigs;
   
           TSENTER();
   
           for (node = OF_child(parent); node != 0; node = OF_peer(node)) {
                   if (!ofw_bus_node_status_okay(node))
                           continue;
                   pinctrl_configure_children(pinctrl, node);
                   nconfigs = OF_getencprop_alloc_multi(node, "pinctrl-0",
                       sizeof(*configs), (void **)&configs);
                   if (nconfigs <= 0)
                           continue;
                   if (bootverbose) {
                           char name[32];
                           OF_getprop(node, "name", &name, sizeof(name));
                           printf("Processing %d pin-config node(s) in pinctrl-0 for %s\n",
                               nconfigs, name);
                   }
                   for (i = 0; i < nconfigs; i++) {
                           if (OF_device_from_xref(configs[i]) == pinctrl)
                                   FDT_PINCTRL_CONFIGURE(pinctrl, configs[i]);
                   }
                   OF_prop_free(configs);
           }
           TSEXIT();
           return (0);
   }
   
   int
   fdt_pinctrl_configure_tree(device_t pinctrl)
   {
   
           return (pinctrl_configure_children(pinctrl, OF_peer(0)));
   }
   

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