arch/sparc/kernel/prom_common.c

   1 /* prom_common.c: OF device tree support common code.
   2  *
   3  * Paul Mackerras       August 1996.
   4  * Copyright (C) 1996-2005 Paul Mackerras.
   5  *
   6  *  Adapted for 64bit PowerPC by Dave Engebretsen and Peter Bergner.
   7  *    {engebret|bergner}@us.ibm.com
   8  *
   9  *  Adapted for sparc by David S. Miller davem@davemloft.net
  10  *
  11  *      This program is free software; you can redistribute it and/or
  12  *      modify it under the terms of the GNU General Public License
  13  *      as published by the Free Software Foundation; either version
  14  *      2 of the License, or (at your option) any later version.
  15  */
  16
  17 #include <linux/kernel.h>
  18 #include <linux/module.h>
  19 #include <linux/errno.h>
  20 #include <linux/mutex.h>
  21 #include <linux/slab.h>
  22 #include <linux/of.h>
  23 #include <asm/prom.h>
  24 #include <asm/oplib.h>
  25 #include <asm/leon.h>
  26
  27 #include "prom.h"
  28
  29 void (*prom_build_more)(struct device_node *dp, struct device_node ***nextp);
  30
  31 struct device_node *of_console_device;
  32 EXPORT_SYMBOL(of_console_device);
  33
  34 char *of_console_path;
  35 EXPORT_SYMBOL(of_console_path);
  36
  37 char *of_console_options;
  38 EXPORT_SYMBOL(of_console_options);
  39
  40 int of_getintprop_default(struct device_node *np, const char *name, int def)
  41 {
  42         struct property *prop;
  43         int len;
  44
  45         prop = of_find_property(np, name, &len);
  46         if (!prop || len != 4)
  47                 return def;
  48
  49         return *(int *) prop->value;
  50 }
  51 EXPORT_SYMBOL(of_getintprop_default);
  52
  53 DEFINE_MUTEX(of_set_property_mutex);
  54 EXPORT_SYMBOL(of_set_property_mutex);
  55
  56 int of_set_property(struct device_node *dp, const char *name, void *val, int len)
  57 {
  58         struct property **prevp;
  59         void *new_val;
  60         int err;
  61
  62         new_val = kmalloc(len, GFP_KERNEL);
  63         if (!new_val)
  64                 return -ENOMEM;
  65
  66         memcpy(new_val, val, len);
  67
  68         err = -ENODEV;
  69
  70         mutex_lock(&of_set_property_mutex);
  71         write_lock(&devtree_lock);
  72         prevp = &dp->properties;
  73         while (*prevp) {
  74                 struct property *prop = *prevp;
  75
  76                 if (!strcasecmp(prop->name, name)) {
  77                         void *old_val = prop->value;
  78                         int ret;
  79
  80                         ret = prom_setprop(dp->phandle, name, val, len);
  81
  82                         err = -EINVAL;
  83                         if (ret >= 0) {
  84                                 prop->value = new_val;
  85                                 prop->length = len;
  86
  87                                 if (OF_IS_DYNAMIC(prop))
  88                                         kfree(old_val);
  89
  90                                 OF_MARK_DYNAMIC(prop);
  91
  92                                 err = 0;
  93                         }
  94                         break;
  95                 }
  96                 prevp = &(*prevp)->next;
  97         }
  98         write_unlock(&devtree_lock);
  99         mutex_unlock(&of_set_property_mutex);
 100
 101         /* XXX Upate procfs if necessary... */
 102
 103         return err;
 104 }
 105 EXPORT_SYMBOL(of_set_property);
 106
 107 int of_find_in_proplist(const char *list, const char *match, int len)
 108 {
 109         while (len > 0) {
 110                 int l;
 111
 112                 if (!strcmp(list, match))
 113                         return 1;
 114                 l = strlen(list) + 1;
 115                 list += l;
 116                 len -= l;
 117         }
 118         return 0;
 119 }
 120 EXPORT_SYMBOL(of_find_in_proplist);
 121
 122 unsigned int prom_unique_id;
 123
 124 static struct property * __init build_one_prop(phandle node, char *prev,
 125                                                char *special_name,
 126                                                void *special_val,
 127                                                int special_len)
 128 {
 129         static struct property *tmp = NULL;
 130         struct property *p;
 131         const char *name;
 132
 133         if (tmp) {
 134                 p = tmp;
 135                 memset(p, 0, sizeof(*p) + 32);
 136                 tmp = NULL;
 137         } else {
 138                 p = prom_early_alloc(sizeof(struct property) + 32);
 139                 p->unique_id = prom_unique_id++;
 140         }
 141
 142         p->name = (char *) (p + 1);
 143         if (special_name) {
 144                 strcpy(p->name, special_name);
 145                 p->length = special_len;
 146                 p->value = prom_early_alloc(special_len);
 147                 memcpy(p->value, special_val, special_len);
 148         } else {
 149                 if (prev == NULL) {
 150                         name = prom_firstprop(node, p->name);
 151                 } else {
 152                         name = prom_nextprop(node, prev, p->name);
 153                 }
 154
 155                 if (!name || strlen(name) == 0) {
 156                         tmp = p;
 157                         return NULL;
 158                 }
 159 #ifdef CONFIG_SPARC32
 160                 strcpy(p->name, name);
 161 #endif
 162                 p->length = prom_getproplen(node, p->name);
 163                 if (p->length <= 0) {
 164                         p->length = 0;
 165                 } else {
 166                         int len;
 167
 168                         p->value = prom_early_alloc(p->length + 1);
 169                         len = prom_getproperty(node, p->name, p->value,
 170                                                p->length);
 171                         if (len <= 0)
 172                                 p->length = 0;
 173                         ((unsigned char *)p->value)[p->length] = '\0';
 174                 }
 175         }
 176         return p;
 177 }
 178
 179 static struct property * __init build_prop_list(phandle node)
 180 {
 181         struct property *head, *tail;
 182
 183         head = tail = build_one_prop(node, NULL,
 184                                      ".node", &node, sizeof(node));
 185
 186         tail->next = build_one_prop(node, NULL, NULL, NULL, 0);
 187         tail = tail->next;
 188         while(tail) {
 189                 tail->next = build_one_prop(node, tail->name,
 190                                             NULL, NULL, 0);
 191                 tail = tail->next;
 192         }
 193
 194         return head;
 195 }
 196
 197 static char * __init get_one_property(phandle node, const char *name)
 198 {
 199         char *buf = "<NULL>";
 200         int len;
 201
 202         len = prom_getproplen(node, name);
 203         if (len > 0) {
 204                 buf = prom_early_alloc(len);
 205                 len = prom_getproperty(node, name, buf, len);
 206         }
 207
 208         return buf;
 209 }
 210
 211 static struct device_node * __init prom_create_node(phandle node,
 212                                                     struct device_node *parent)
 213 {
 214         struct device_node *dp;
 215
 216         if (!node)
 217                 return NULL;
 218
 219         dp = prom_early_alloc(sizeof(*dp));
 220         dp->unique_id = prom_unique_id++;
 221         dp->parent = parent;
 222
 223         kref_init(&dp->kref);
 224
 225         dp->name = get_one_property(node, "name");
 226         dp->type = get_one_property(node, "device_type");
 227         dp->phandle = node;
 228
 229         dp->properties = build_prop_list(node);
 230
 231         irq_trans_init(dp);
 232
 233         return dp;
 234 }
 235
 236 char * __init build_full_name(struct device_node *dp)
 237 {
 238         int len, ourlen, plen;
 239         char *n;
 240
 241         plen = strlen(dp->parent->full_name);
 242         ourlen = strlen(dp->path_component_name);
 243         len = ourlen + plen + 2;
 244
 245         n = prom_early_alloc(len);
 246         strcpy(n, dp->parent->full_name);
 247         if (!is_root_node(dp->parent)) {
 248                 strcpy(n + plen, "/");
 249                 plen++;
 250         }
 251         strcpy(n + plen, dp->path_component_name);
 252
 253         return n;
 254 }
 255
 256 static struct device_node * __init prom_build_tree(struct device_node *parent,
 257                                                    phandle node,
 258                                                    struct device_node ***nextp)
 259 {
 260         struct device_node *ret = NULL, *prev_sibling = NULL;
 261         struct device_node *dp;
 262
 263         while (1) {
 264                 dp = prom_create_node(node, parent);
 265                 if (!dp)
 266                         break;
 267
 268                 if (prev_sibling)
 269                         prev_sibling->sibling = dp;
 270
 271                 if (!ret)
 272                         ret = dp;
 273                 prev_sibling = dp;
 274
 275                 *(*nextp) = dp;
 276                 *nextp = &dp->allnext;
 277
 278                 dp->path_component_name = build_path_component(dp);
 279                 dp->full_name = build_full_name(dp);
 280
 281                 dp->child = prom_build_tree(dp, prom_getchild(node), nextp);
 282
 283                 if (prom_build_more)
 284                         prom_build_more(dp, nextp);
 285
 286                 node = prom_getsibling(node);
 287         }
 288
 289         return ret;
 290 }
 291
 292 unsigned int prom_early_allocated __initdata;
 293
 294 void __init prom_build_devicetree(void)
 295 {
 296         struct device_node **nextp;
 297
 298         allnodes = prom_create_node(prom_root_node, NULL);
 299         allnodes->path_component_name = "";
 300         allnodes->full_name = "/";
 301
 302         nextp = &allnodes->allnext;
 303         allnodes->child = prom_build_tree(allnodes,
 304                                           prom_getchild(allnodes->phandle),
 305                                           &nextp);
 306         of_console_init();
 307
 308         printk("PROM: Built device tree with %u bytes of memory.\n",
 309                prom_early_allocated);
 310 }