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 static 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 ((s32)node == -1)
  44                 return 0;
  45
  46         cnode = __prom_getchild(node);
  47         if (cnode == 0 || (s32)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 static 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 ((s32)node == -1)
  76                 return 0;
  77
  78         sibnode = __prom_getsibling(node);
  79         if (sibnode == 0 || (s32)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 /* Search siblings at 'node_start' for a node with name
 181  * 'nodename'.  Return node if successful, zero if not.
 182  */
 183 phandle prom_searchsiblings(phandle node_start, char *nodename)
 184 {
 185
 186         phandle thisnode;
 187         int error;
 188
 189         for(thisnode = node_start; thisnode;
 190             thisnode=prom_getsibling(thisnode)) {
 191                 error = prom_getproperty(thisnode, "name", promlib_buf,
 192                                          sizeof(promlib_buf));
 193                 /* Should this ever happen? */
 194                 if(error == -1) continue;
 195                 if(strcmp(nodename, promlib_buf)==0) return thisnode;
 196         }
 197
 198         return 0;
 199 }
 200 EXPORT_SYMBOL(prom_searchsiblings);
 201
 202 /* Interal version of nextprop that does not alter return values. */
 203 static char *__prom_nextprop(phandle node, char * oprop)
 204 {
 205         unsigned long flags;
 206         char *prop;
 207
 208         spin_lock_irqsave(&prom_lock, flags);
 209         prop = prom_nodeops->no_nextprop(node, oprop);
 210         restore_current();
 211         spin_unlock_irqrestore(&prom_lock, flags);
 212
 213         return prop;
 214 }
 215
 216 /* Return the property type string after property type 'oprop'
 217  * at node 'node' .  Returns empty string if no more
 218  * property types for this node.
 219  */
 220 char *prom_nextprop(phandle node, char *oprop, char *buffer)
 221 {
 222         if (node == 0 || (s32)node == -1)
 223                 return "";
 224
 225         return __prom_nextprop(node, oprop);
 226 }
 227 EXPORT_SYMBOL(prom_nextprop);
 228
 229 phandle prom_finddevice(char *name)
 230 {
 231         char nbuf[128];
 232         char *s = name, *d;
 233         phandle node = prom_root_node, node2;
 234         unsigned int which_io, phys_addr;
 235         struct linux_prom_registers reg[PROMREG_MAX];
 236
 237         while (*s++) {
 238                 if (!*s) return node; /* path '.../' is legal */
 239                 node = prom_getchild(node);
 240
 241                 for (d = nbuf; *s != 0 && *s != '@' && *s != '/';)
 242                         *d++ = *s++;
 243                 *d = 0;
 244
 245                 node = prom_searchsiblings(node, nbuf);
 246                 if (!node)
 247                         return 0;
 248
 249                 if (*s == '@') {
 250                         if (isxdigit(s[1]) && s[2] == ',') {
 251                                 which_io = simple_strtoul(s+1, NULL, 16);
 252                                 phys_addr = simple_strtoul(s+3, &d, 16);
 253                                 if (d != s + 3 && (!*d || *d == '/')
 254                                     && d <= s + 3 + 8) {
 255                                         node2 = node;
 256                                         while (node2 && (s32)node2 != -1) {
 257                                                 if (prom_getproperty (node2, "reg", (char *)reg, sizeof (reg)) > 0) {
 258                                                         if (which_io == reg[0].which_io && phys_addr == reg[0].phys_addr) {
 259                                                                 node = node2;
 260                                                                 break;
 261                                                         }
 262                                                 }
 263                                                 node2 = prom_getsibling(node2);
 264                                                 if (!node2 || (s32)node2 == -1)
 265                                                         break;
 266                                                 node2 = prom_searchsiblings(prom_getsibling(node2), nbuf);
 267                                         }
 268                                 }
 269                         }
 270                         while (*s != 0 && *s != '/') s++;
 271                 }
 272         }
 273         return node;
 274 }
 275 EXPORT_SYMBOL(prom_finddevice);
 276
 277 /* Set property 'pname' at node 'node' to value 'value' which has a length
 278  * of 'size' bytes.  Return the number of bytes the prom accepted.
 279  */
 280 int prom_setprop(phandle node, const char *pname, char *value, int size)
 281 {
 282         unsigned long flags;
 283         int ret;
 284
 285         if (size == 0)
 286                 return 0;
 287         if ((pname == NULL) || (value == NULL))
 288                 return 0;
 289         spin_lock_irqsave(&prom_lock, flags);
 290         ret = prom_nodeops->no_setprop(node, pname, value, size);
 291         restore_current();
 292         spin_unlock_irqrestore(&prom_lock, flags);
 293         return ret;
 294 }
 295 EXPORT_SYMBOL(prom_setprop);
 296
 297 phandle prom_inst2pkg(int inst)
 298 {
 299         phandle node;
 300         unsigned long flags;
 301
 302         spin_lock_irqsave(&prom_lock, flags);
 303         node = (*romvec->pv_v2devops.v2_inst2pkg)(inst);
 304         restore_current();
 305         spin_unlock_irqrestore(&prom_lock, flags);
 306         if ((s32)node == -1)
 307                 return 0;
 308         return node;
 309 }