arch/sparc/prom/tree_32.c

   1 /*
   2  * tree.c: Basic device tree traversal/scanning for the Linux
   3  *         prom library.
   4  *
   5  * Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu)
   6  */
   7
   8 #include <linux/string.h>
   9 #include <linux/types.h>
  10 #include <linux/kernel.h>
  11 #include <linux/sched.h>
  12 #include <linux/ctype.h>
  13 #include <linux/module.h>
  14
  15 #include <asm/openprom.h>
  16 #include <asm/oplib.h>
  17
  18 extern void restore_current(void);
  19
  20 static char promlib_buf[128];
  21
  22 /* Internal version of prom_getchild that does not alter return values. */
  23 phandle __prom_getchild(phandle node)
  24 {
  25         unsigned long flags;
  26         phandle cnode;
  27
  28         spin_lock_irqsave(&prom_lock, flags);
  29         cnode = prom_nodeops->no_child(node);
  30         restore_current();
  31         spin_unlock_irqrestore(&prom_lock, flags);
  32
  33         return cnode;
  34 }
  35
  36 /* Return the child of node 'node' or zero if no this node has no
  37  * direct descendent.
  38  */
  39 phandle prom_getchild(phandle node)
  40 {
  41         phandle cnode;
  42
  43         if (node == -1)
  44                 return 0;
  45
  46         cnode = __prom_getchild(node);
  47         if (cnode == 0 || cnode == -1)
  48                 return 0;
  49
  50         return cnode;
  51 }
  52 EXPORT_SYMBOL(prom_getchild);
  53
  54 /* Internal version of prom_getsibling that does not alter return values. */
  55 phandle __prom_getsibling(phandle node)
  56 {
  57         unsigned long flags;
  58         phandle cnode;
  59
  60         spin_lock_irqsave(&prom_lock, flags);
  61         cnode = prom_nodeops->no_nextnode(node);
  62         restore_current();
  63         spin_unlock_irqrestore(&prom_lock, flags);
  64
  65         return cnode;
  66 }
  67
  68 /* Return the next sibling of node 'node' or zero if no more siblings
  69  * at this level of depth in the tree.
  70  */
  71 phandle prom_getsibling(phandle node)
  72 {
  73         phandle sibnode;
  74
  75         if (node == -1)
  76                 return 0;
  77
  78         sibnode = __prom_getsibling(node);
  79         if (sibnode == 0 || sibnode == -1)
  80                 return 0;
  81
  82         return sibnode;
  83 }
  84 EXPORT_SYMBOL(prom_getsibling);
  85
  86 /* Return the length in bytes of property 'prop' at node 'node'.
  87  * Return -1 on error.
  88  */
  89 int prom_getproplen(phandle node, const char *prop)
  90 {
  91         int ret;
  92         unsigned long flags;
  93
  94         if((!node) || (!prop))
  95                 return -1;
  96
  97         spin_lock_irqsave(&prom_lock, flags);
  98         ret = prom_nodeops->no_proplen(node, prop);
  99         restore_current();
 100         spin_unlock_irqrestore(&prom_lock, flags);
 101         return ret;
 102 }
 103 EXPORT_SYMBOL(prom_getproplen);
 104
 105 /* Acquire a property 'prop' at node 'node' and place it in
 106  * 'buffer' which has a size of 'bufsize'.  If the acquisition
 107  * was successful the length will be returned, else -1 is returned.
 108  */
 109 int prom_getproperty(phandle node, const char *prop, char *buffer, int bufsize)
 110 {
 111         int plen, ret;
 112         unsigned long flags;
 113
 114         plen = prom_getproplen(node, prop);
 115         if((plen > bufsize) || (plen == 0) || (plen == -1))
 116                 return -1;
 117         /* Ok, things seem all right. */
 118         spin_lock_irqsave(&prom_lock, flags);
 119         ret = prom_nodeops->no_getprop(node, prop, buffer);
 120         restore_current();
 121         spin_unlock_irqrestore(&prom_lock, flags);
 122         return ret;
 123 }
 124 EXPORT_SYMBOL(prom_getproperty);
 125
 126 /* Acquire an integer property and return its value.  Returns -1
 127  * on failure.
 128  */
 129 int prom_getint(phandle node, char *prop)
 130 {
 131         static int intprop;
 132
 133         if(prom_getproperty(node, prop, (char *) &intprop, sizeof(int)) != -1)
 134                 return intprop;
 135
 136         return -1;
 137 }
 138 EXPORT_SYMBOL(prom_getint);
 139
 140 /* Acquire an integer property, upon error return the passed default
 141  * integer.
 142  */
 143 int prom_getintdefault(phandle node, char *property, int deflt)
 144 {
 145         int retval;
 146
 147         retval = prom_getint(node, property);
 148         if(retval == -1) return deflt;
 149
 150         return retval;
 151 }
 152 EXPORT_SYMBOL(prom_getintdefault);
 153
 154 /* Acquire a boolean property, 1=TRUE 0=FALSE. */
 155 int prom_getbool(phandle node, char *prop)
 156 {
 157         int retval;
 158
 159         retval = prom_getproplen(node, prop);
 160         if(retval == -1) return 0;
 161         return 1;
 162 }
 163 EXPORT_SYMBOL(prom_getbool);
 164
 165 /* Acquire a property whose value is a string, returns a null
 166  * string on error.  The char pointer is the user supplied string
 167  * buffer.
 168  */
 169 void prom_getstring(phandle node, char *prop, char *user_buf, int ubuf_size)
 170 {
 171         int len;
 172
 173         len = prom_getproperty(node, prop, user_buf, ubuf_size);
 174         if(len != -1) return;
 175         user_buf[0] = 0;
 176 }
 177 EXPORT_SYMBOL(prom_getstring);
 178
 179
 180 /* Does the device at node 'node' have name 'name'?
 181  * YES = 1   NO = 0
 182  */
 183 int prom_nodematch(phandle node, char *name)
 184 {
 185         int error;
 186
 187         static char namebuf[128];
 188         error = prom_getproperty(node, "name", namebuf, sizeof(namebuf));
 189         if (error == -1) return 0;
 190         if(strcmp(namebuf, name) == 0) return 1;
 191         return 0;
 192 }
 193
 194 /* Search siblings at 'node_start' for a node with name
 195  * 'nodename'.  Return node if successful, zero if not.
 196  */
 197 phandle prom_searchsiblings(phandle node_start, char *nodename)
 198 {
 199
 200         phandle thisnode;
 201         int error;
 202
 203         for(thisnode = node_start; thisnode;
 204             thisnode=prom_getsibling(thisnode)) {
 205                 error = prom_getproperty(thisnode, "name", promlib_buf,
 206                                          sizeof(promlib_buf));
 207                 /* Should this ever happen? */
 208                 if(error == -1) continue;
 209                 if(strcmp(nodename, promlib_buf)==0) return thisnode;
 210         }
 211
 212         return 0;
 213 }
 214 EXPORT_SYMBOL(prom_searchsiblings);
 215
 216 /* Interal version of nextprop that does not alter return values. */
 217 char *__prom_nextprop(phandle node, char * oprop)
 218 {
 219         unsigned long flags;
 220         char *prop;
 221
 222         spin_lock_irqsave(&prom_lock, flags);
 223         prop = prom_nodeops->no_nextprop(node, oprop);
 224         restore_current();
 225         spin_unlock_irqrestore(&prom_lock, flags);
 226
 227         return prop;
 228 }
 229
 230 /* Return the first property name for node 'node'. */
 231 /* buffer is unused argument, but as v9 uses it, we need to have the same interface */
 232 char *prom_firstprop(phandle node, char *bufer)
 233 {
 234         if (node == 0 || node == -1)
 235                 return "";
 236
 237         return __prom_nextprop(node, "");
 238 }
 239 EXPORT_SYMBOL(prom_firstprop);
 240
 241 /* Return the property type string after property type 'oprop'
 242  * at node 'node' .  Returns empty string if no more
 243  * property types for this node.
 244  */
 245 char *prom_nextprop(phandle node, char *oprop, char *buffer)
 246 {
 247         if (node == 0 || node == -1)
 248                 return "";
 249
 250         return __prom_nextprop(node, oprop);
 251 }
 252 EXPORT_SYMBOL(prom_nextprop);
 253
 254 phandle prom_finddevice(char *name)
 255 {
 256         char nbuf[128];
 257         char *s = name, *d;
 258         phandle node = prom_root_node, node2;
 259         unsigned int which_io, phys_addr;
 260         struct linux_prom_registers reg[PROMREG_MAX];
 261
 262         while (*s++) {
 263                 if (!*s) return node; /* path '.../' is legal */
 264                 node = prom_getchild(node);
 265
 266                 for (d = nbuf; *s != 0 && *s != '@' && *s != '/';)
 267                         *d++ = *s++;
 268                 *d = 0;
 269
 270                 node = prom_searchsiblings(node, nbuf);
 271                 if (!node)
 272                         return 0;
 273
 274                 if (*s == '@') {
 275                         if (isxdigit(s[1]) && s[2] == ',') {
 276                                 which_io = simple_strtoul(s+1, NULL, 16);
 277                                 phys_addr = simple_strtoul(s+3, &d, 16);
 278                                 if (d != s + 3 && (!*d || *d == '/')
 279                                     && d <= s + 3 + 8) {
 280                                         node2 = node;
 281                                         while (node2 && node2 != -1) {
 282                                                 if (prom_getproperty (node2, "reg", (char *)reg, sizeof (reg)) > 0) {
 283                                                         if (which_io == reg[0].which_io && phys_addr == reg[0].phys_addr) {
 284                                                                 node = node2;
 285                                                                 break;
 286                                                         }
 287                                                 }
 288                                                 node2 = prom_getsibling(node2);
 289                                                 if (!node2 || node2 == -1)
 290                                                         break;
 291                                                 node2 = prom_searchsiblings(prom_getsibling(node2), nbuf);
 292                                         }
 293                                 }
 294                         }
 295                         while (*s != 0 && *s != '/') s++;
 296                 }
 297         }
 298         return node;
 299 }
 300 EXPORT_SYMBOL(prom_finddevice);
 301
 302 int prom_node_has_property(phandle node, char *prop)
 303 {
 304         char *current_property = "";
 305
 306         do {
 307                 current_property = prom_nextprop(node, current_property, NULL);
 308                 if(!strcmp(current_property, prop))
 309                    return 1;
 310         } while (*current_property);
 311         return 0;
 312 }
 313 EXPORT_SYMBOL(prom_node_has_property);
 314
 315 /* Set property 'pname' at node 'node' to value 'value' which has a length
 316  * of 'size' bytes.  Return the number of bytes the prom accepted.
 317  */
 318 int prom_setprop(phandle node, const char *pname, char *value, int size)
 319 {
 320         unsigned long flags;
 321         int ret;
 322
 323         if(size == 0) return 0;
 324         if((pname == 0) || (value == 0)) return 0;
 325         spin_lock_irqsave(&prom_lock, flags);
 326         ret = prom_nodeops->no_setprop(node, pname, value, size);
 327         restore_current();
 328         spin_unlock_irqrestore(&prom_lock, flags);
 329         return ret;
 330 }
 331 EXPORT_SYMBOL(prom_setprop);
 332
 333 phandle prom_inst2pkg(int inst)
 334 {
 335         phandle node;
 336         unsigned long flags;
 337
 338         spin_lock_irqsave(&prom_lock, flags);
 339         node = (*romvec->pv_v2devops.v2_inst2pkg)(inst);
 340         restore_current();
 341         spin_unlock_irqrestore(&prom_lock, flags);
 342         if (node == -1) return 0;
 343         return node;
 344 }