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 struct device_node *of_find_node_by_phandle(phandle handle)
  41 {
  42         struct device_node *np;
  43
  44         for (np = allnodes; np; np = np->allnext)
  45                 if (np->node == handle)
  46                         break;
  47
  48         return np;
  49 }
  50 EXPORT_SYMBOL(of_find_node_by_phandle);
  51
  52 int of_getintprop_default(struct device_node *np, const char *name, int def)
  53 {
  54         struct property *prop;
  55         int len;
  56
  57         prop = of_find_property(np, name, &len);
  58         if (!prop || len != 4)
  59                 return def;
  60
  61         return *(int *) prop->value;
  62 }
  63 EXPORT_SYMBOL(of_getintprop_default);
  64
  65 DEFINE_MUTEX(of_set_property_mutex);
  66 EXPORT_SYMBOL(of_set_property_mutex);
  67
  68 int of_set_property(struct device_node *dp, const char *name, void *val, int len)
  69 {
  70         struct property **prevp;
  71         void *new_val;
  72         int err;
  73
  74         new_val = kmalloc(len, GFP_KERNEL);
  75         if (!new_val)
  76                 return -ENOMEM;
  77
  78         memcpy(new_val, val, len);
  79
  80         err = -ENODEV;
  81
  82         write_lock(&devtree_lock);
  83         prevp = &dp->properties;
  84         while (*prevp) {
  85                 struct property *prop = *prevp;
  86
  87                 if (!strcasecmp(prop->name, name)) {
  88                         void *old_val = prop->value;
  89                         int ret;
  90
  91                         mutex_lock(&of_set_property_mutex);
  92                         ret = prom_setprop(dp->node, name, val, len);
  93                         mutex_unlock(&of_set_property_mutex);
  94
  95                         err = -EINVAL;
  96                         if (ret >= 0) {
  97                                 prop->value = new_val;
  98                                 prop->length = len;
  99
 100                                 if (OF_IS_DYNAMIC(prop))
 101                                         kfree(old_val);
 102
 103                                 OF_MARK_DYNAMIC(prop);
 104
 105                                 err = 0;
 106                         }
 107                         break;
 108                 }
 109                 prevp = &(*prevp)->next;
 110         }
 111         write_unlock(&devtree_lock);
 112
 113         /* XXX Upate procfs if necessary... */
 114
 115         return err;
 116 }
 117 EXPORT_SYMBOL(of_set_property);
 118
 119 int of_find_in_proplist(const char *list, const char *match, int len)
 120 {
 121         while (len > 0) {
 122                 int l;
 123
 124                 if (!strcmp(list, match))
 125                         return 1;
 126                 l = strlen(list) + 1;
 127                 list += l;
 128                 len -= l;
 129         }
 130         return 0;
 131 }
 132 EXPORT_SYMBOL(of_find_in_proplist);
 133
 134 unsigned int prom_unique_id;
 135
 136 static struct property * __init build_one_prop(phandle node, char *prev,
 137                                                char *special_name,
 138                                                void *special_val,
 139                                                int special_len)
 140 {
 141         static struct property *tmp = NULL;
 142         struct property *p;
 143         const char *name;
 144
 145         if (tmp) {
 146                 p = tmp;
 147                 memset(p, 0, sizeof(*p) + 32);
 148                 tmp = NULL;
 149         } else {
 150                 p = prom_early_alloc(sizeof(struct property) + 32);
 151                 p->unique_id = prom_unique_id++;
 152         }
 153
 154         p->name = (char *) (p + 1);
 155         if (special_name) {
 156                 strcpy(p->name, special_name);
 157                 p->length = special_len;
 158                 p->value = prom_early_alloc(special_len);
 159                 memcpy(p->value, special_val, special_len);
 160         } else {
 161                 if (prev == NULL) {
 162                         name = prom_firstprop(node, p->name);
 163                 } else {
 164                         name = prom_nextprop(node, prev, p->name);
 165                 }
 166
 167                 if (!name || strlen(name) == 0) {
 168                         tmp = p;
 169                         return NULL;
 170                 }
 171 #ifdef CONFIG_SPARC32
 172                 strcpy(p->name, name);
 173 #endif
 174                 p->length = prom_getproplen(node, p->name);
 175                 if (p->length <= 0) {
 176                         p->length = 0;
 177                 } else {
 178                         int len;
 179
 180                         p->value = prom_early_alloc(p->length + 1);
 181                         len = prom_getproperty(node, p->name, p->value,
 182                                                p->length);
 183                         if (len <= 0)
 184                                 p->length = 0;
 185                         ((unsigned char *)p->value)[p->length] = '\0';
 186                 }
 187         }
 188         return p;
 189 }
 190
 191 static struct property * __init build_prop_list(phandle node)
 192 {
 193         struct property *head, *tail;
 194
 195         head = tail = build_one_prop(node, NULL,
 196                                      ".node", &node, sizeof(node));
 197
 198         tail->next = build_one_prop(node, NULL, NULL, NULL, 0);
 199         tail = tail->next;
 200         while(tail) {
 201                 tail->next = build_one_prop(node, tail->name,
 202                                             NULL, NULL, 0);
 203                 tail = tail->next;
 204         }
 205
 206         return head;
 207 }
 208
 209 static char * __init get_one_property(phandle node, const char *name)
 210 {
 211         char *buf = "<NULL>";
 212         int len;
 213
 214         len = prom_getproplen(node, name);
 215         if (len > 0) {
 216                 buf = prom_early_alloc(len);
 217                 len = prom_getproperty(node, name, buf, len);
 218         }
 219
 220         return buf;
 221 }
 222
 223 static struct device_node * __init prom_create_node(phandle node,
 224                                                     struct device_node *parent)
 225 {
 226         struct device_node *dp;
 227
 228         if (!node)
 229                 return NULL;
 230
 231         dp = prom_early_alloc(sizeof(*dp));
 232         dp->unique_id = prom_unique_id++;
 233         dp->parent = parent;
 234
 235         kref_init(&dp->kref);
 236
 237         dp->name = get_one_property(node, "name");
 238         dp->type = get_one_property(node, "device_type");
 239         dp->node = node;
 240
 241         dp->properties = build_prop_list(node);
 242
 243         irq_trans_init(dp);
 244
 245         return dp;
 246 }
 247
 248 char * __init build_full_name(struct device_node *dp)
 249 {
 250         int len, ourlen, plen;
 251         char *n;
 252
 253         plen = strlen(dp->parent->full_name);
 254         ourlen = strlen(dp->path_component_name);
 255         len = ourlen + plen + 2;
 256
 257         n = prom_early_alloc(len);
 258         strcpy(n, dp->parent->full_name);
 259         if (!is_root_node(dp->parent)) {
 260                 strcpy(n + plen, "/");
 261                 plen++;
 262         }
 263         strcpy(n + plen, dp->path_component_name);
 264
 265         return n;
 266 }
 267
 268 static struct device_node * __init prom_build_tree(struct device_node *parent,
 269                                                    phandle node,
 270                                                    struct device_node ***nextp)
 271 {
 272         struct device_node *ret = NULL, *prev_sibling = NULL;
 273         struct device_node *dp;
 274
 275         while (1) {
 276                 dp = prom_create_node(node, parent);
 277                 if (!dp)
 278                         break;
 279
 280                 if (prev_sibling)
 281                         prev_sibling->sibling = dp;
 282
 283                 if (!ret)
 284                         ret = dp;
 285                 prev_sibling = dp;
 286
 287                 *(*nextp) = dp;
 288                 *nextp = &dp->allnext;
 289
 290                 dp->path_component_name = build_path_component(dp);
 291                 dp->full_name = build_full_name(dp);
 292
 293                 dp->child = prom_build_tree(dp, prom_getchild(node), nextp);
 294
 295                 if (prom_build_more)
 296                         prom_build_more(dp, nextp);
 297
 298                 node = prom_getsibling(node);
 299         }
 300
 301         return ret;
 302 }
 303
 304 unsigned int prom_early_allocated __initdata;
 305
 306 void __init prom_build_devicetree(void)
 307 {
 308         struct device_node **nextp;
 309
 310         allnodes = prom_create_node(prom_root_node, NULL);
 311         allnodes->path_component_name = "";
 312         allnodes->full_name = "/";
 313
 314         nextp = &allnodes->allnext;
 315         allnodes->child = prom_build_tree(allnodes,
 316                                           prom_getchild(allnodes->node),
 317                                           &nextp);
 318         of_console_init();
 319
 320         printk("PROM: Built device tree with %u bytes of memory.\n",
 321                prom_early_allocated);
 322 }