arch/sparc/prom/tree.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 #define PROMLIB_INTERNAL
   9
  10 #include <linux/string.h>
  11 #include <linux/types.h>
  12 #include <linux/kernel.h>
  13 #include <linux/sched.h>
  14 #include <linux/ctype.h>
  15
  16 #include <asm/openprom.h>
  17 #include <asm/oplib.h>
  18
  19 extern void restore_current(void);
  20
  21 static char promlib_buf[128];
  22
  23 /* Internal version of prom_getchild that does not alter return values. */
  24 int __prom_getchild(int node)
  25 {
  26         unsigned long flags;
  27         int cnode;
  28
  29         spin_lock_irqsave(&prom_lock, flags);
  30         cnode = prom_nodeops->no_child(node);
  31         restore_current();
  32         spin_unlock_irqrestore(&prom_lock, flags);
  33
  34         return cnode;
  35 }
  36
  37 /* Return the child of node 'node' or zero if no this node has no
  38  * direct descendent.
  39  */
  40 int prom_getchild(int node)
  41 {
  42         int cnode;
  43
  44         if (node == -1)
  45                 return 0;
  46
  47         cnode = __prom_getchild(node);
  48         if (cnode == 0 || cnode == -1)
  49                 return 0;
  50
  51         return cnode;
  52 }
  53
  54 /* Internal version of prom_getsibling that does not alter return values. */
  55 int __prom_getsibling(int node)
  56 {
  57         unsigned long flags;
  58         int 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 int prom_getsibling(int node)
  72 {
  73         int 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
  85 /* Return the length in bytes of property 'prop' at node 'node'.
  86  * Return -1 on error.
  87  */
  88 int prom_getproplen(int node, char *prop)
  89 {
  90         int ret;
  91         unsigned long flags;
  92
  93         if((!node) || (!prop))
  94                 return -1;
  95
  96         spin_lock_irqsave(&prom_lock, flags);
  97         ret = prom_nodeops->no_proplen(node, prop);
  98         restore_current();
  99         spin_unlock_irqrestore(&prom_lock, flags);
 100         return ret;
 101 }
 102
 103 /* Acquire a property 'prop' at node 'node' and place it in
 104  * 'buffer' which has a size of 'bufsize'.  If the acquisition
 105  * was successful the length will be returned, else -1 is returned.
 106  */
 107 int prom_getproperty(int node, char *prop, char *buffer, int bufsize)
 108 {
 109         int plen, ret;
 110         unsigned long flags;
 111
 112         plen = prom_getproplen(node, prop);
 113         if((plen > bufsize) || (plen == 0) || (plen == -1))
 114                 return -1;
 115         /* Ok, things seem all right. */
 116         spin_lock_irqsave(&prom_lock, flags);
 117         ret = prom_nodeops->no_getprop(node, prop, buffer);
 118         restore_current();
 119         spin_unlock_irqrestore(&prom_lock, flags);
 120         return ret;
 121 }
 122
 123 /* Acquire an integer property and return its value.  Returns -1
 124  * on failure.
 125  */
 126 int prom_getint(int node, char *prop)
 127 {
 128         static int intprop;
 129
 130         if(prom_getproperty(node, prop, (char *) &intprop, sizeof(int)) != -1)
 131                 return intprop;
 132
 133         return -1;
 134 }
 135
 136 /* Acquire an integer property, upon error return the passed default
 137  * integer.
 138  */
 139 int prom_getintdefault(int node, char *property, int deflt)
 140 {
 141         int retval;
 142
 143         retval = prom_getint(node, property);
 144         if(retval == -1) return deflt;
 145
 146         return retval;
 147 }
 148
 149 /* Acquire a boolean property, 1=TRUE 0=FALSE. */
 150 int prom_getbool(int node, char *prop)
 151 {
 152         int retval;
 153
 154         retval = prom_getproplen(node, prop);
 155         if(retval == -1) return 0;
 156         return 1;
 157 }
 158
 159 /* Acquire a property whose value is a string, returns a null
 160  * string on error.  The char pointer is the user supplied string
 161  * buffer.
 162  */
 163 void prom_getstring(int node, char *prop, char *user_buf, int ubuf_size)
 164 {
 165         int len;
 166
 167         len = prom_getproperty(node, prop, user_buf, ubuf_size);
 168         if(len != -1) return;
 169         user_buf[0] = 0;
 170         return;
 171 }
 172
 173
 174 /* Does the device at node 'node' have name 'name'?
 175  * YES = 1   NO = 0
 176  */
 177 int prom_nodematch(int node, char *name)
 178 {
 179         int error;
 180
 181         static char namebuf[128];
 182         error = prom_getproperty(node, "name", namebuf, sizeof(namebuf));
 183         if (error == -1) return 0;
 184         if(strcmp(namebuf, name) == 0) return 1;
 185         return 0;
 186 }
 187
 188 /* Search siblings at 'node_start' for a node with name
 189  * 'nodename'.  Return node if successful, zero if not.
 190  */
 191 int prom_searchsiblings(int node_start, char *nodename)
 192 {
 193
 194         int thisnode, error;
 195
 196         for(thisnode = node_start; thisnode;
 197             thisnode=prom_getsibling(thisnode)) {
 198                 error = prom_getproperty(thisnode, "name", promlib_buf,
 199                                          sizeof(promlib_buf));
 200                 /* Should this ever happen? */
 201                 if(error == -1) continue;
 202                 if(strcmp(nodename, promlib_buf)==0) return thisnode;
 203         }
 204
 205         return 0;
 206 }
 207
 208 /* Interal version of nextprop that does not alter return values. */
 209 char * __prom_nextprop(int node, char * oprop)
 210 {
 211         unsigned long flags;
 212         char *prop;
 213
 214         spin_lock_irqsave(&prom_lock, flags);
 215         prop = prom_nodeops->no_nextprop(node, oprop);
 216         restore_current();
 217         spin_unlock_irqrestore(&prom_lock, flags);
 218
 219         return prop;
 220 }
 221
 222 /* Return the first property name for node 'node'. */
 223 /* buffer is unused argument, but as v9 uses it, we need to have the same interface */
 224 char * prom_firstprop(int node, char *bufer)
 225 {
 226         if (node == 0 || node == -1)
 227                 return "";
 228
 229         return __prom_nextprop(node, "");
 230 }
 231
 232 /* Return the property type string after property type 'oprop'
 233  * at node 'node' .  Returns empty string if no more
 234  * property types for this node.
 235  */
 236 char * prom_nextprop(int node, char *oprop, char *buffer)
 237 {
 238         if (node == 0 || node == -1)
 239                 return "";
 240
 241         return __prom_nextprop(node, oprop);
 242 }
 243
 244 int prom_finddevice(char *name)
 245 {
 246         char nbuf[128];
 247         char *s = name, *d;
 248         int node = prom_root_node, node2;
 249         unsigned int which_io, phys_addr;
 250         struct linux_prom_registers reg[PROMREG_MAX];
 251
 252         while (*s++) {
 253                 if (!*s) return node; /* path '.../' is legal */
 254                 node = prom_getchild(node);
 255
 256                 for (d = nbuf; *s != 0 && *s != '@' && *s != '/';)
 257                         *d++ = *s++;
 258                 *d = 0;
 259
 260                 node = prom_searchsiblings(node, nbuf);
 261                 if (!node)
 262                         return 0;
 263
 264                 if (*s == '@') {
 265                         if (isxdigit(s[1]) && s[2] == ',') {
 266                                 which_io = simple_strtoul(s+1, NULL, 16);
 267                                 phys_addr = simple_strtoul(s+3, &d, 16);
 268                                 if (d != s + 3 && (!*d || *d == '/')
 269                                     && d <= s + 3 + 8) {
 270                                         node2 = node;
 271                                         while (node2 && node2 != -1) {
 272                                                 if (prom_getproperty (node2, "reg", (char *)reg, sizeof (reg)) > 0) {
 273                                                         if (which_io == reg[0].which_io && phys_addr == reg[0].phys_addr) {
 274                                                                 node = node2;
 275                                                                 break;
 276                                                         }
 277                                                 }
 278                                                 node2 = prom_getsibling(node2);
 279                                                 if (!node2 || node2 == -1)
 280                                                         break;
 281                                                 node2 = prom_searchsiblings(prom_getsibling(node2), nbuf);
 282                                         }
 283                                 }
 284                         }
 285                         while (*s != 0 && *s != '/') s++;
 286                 }
 287         }
 288         return node;
 289 }
 290
 291 int prom_node_has_property(int node, char *prop)
 292 {
 293         char *current_property = "";
 294
 295         do {
 296                 current_property = prom_nextprop(node, current_property, NULL);
 297                 if(!strcmp(current_property, prop))
 298                    return 1;
 299         } while (*current_property);
 300         return 0;
 301 }
 302
 303 /* Set property 'pname' at node 'node' to value 'value' which has a length
 304  * of 'size' bytes.  Return the number of bytes the prom accepted.
 305  */
 306 int prom_setprop(int node, char *pname, char *value, int size)
 307 {
 308         unsigned long flags;
 309         int ret;
 310
 311         if(size == 0) return 0;
 312         if((pname == 0) || (value == 0)) return 0;
 313         spin_lock_irqsave(&prom_lock, flags);
 314         ret = prom_nodeops->no_setprop(node, pname, value, size);
 315         restore_current();
 316         spin_unlock_irqrestore(&prom_lock, flags);
 317         return ret;
 318 }
 319
 320 int prom_inst2pkg(int inst)
 321 {
 322         int node;
 323         unsigned long flags;
 324
 325         spin_lock_irqsave(&prom_lock, flags);
 326         node = (*romvec->pv_v2devops.v2_inst2pkg)(inst);
 327         restore_current();
 328         spin_unlock_irqrestore(&prom_lock, flags);
 329         if (node == -1) return 0;
 330         return node;
 331 }
 332
 333 /* Return 'node' assigned to a particular prom 'path'
 334  * FIXME: Should work for v0 as well
 335  */
 336 int prom_pathtoinode(char *path)
 337 {
 338         int node, inst;
 339
 340         inst = prom_devopen (path);
 341         if (inst == -1) return 0;
 342         node = prom_inst2pkg (inst);
 343         prom_devclose (inst);
 344         if (node == -1) return 0;
 345         return node;
 346 }