Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* $Id: tree.c,v 1.10 1998/01/10 22:39:00 ecd Exp $ |
| 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 | * Copyright (C) 1996,1997 Jakub Jelinek (jj@sunsite.mff.cuni.cz) |
| 7 | */ |
| 8 | |
| 9 | #include <linux/string.h> |
| 10 | #include <linux/types.h> |
| 11 | #include <linux/kernel.h> |
| 12 | #include <linux/sched.h> |
| 13 | |
| 14 | #include <asm/openprom.h> |
| 15 | #include <asm/oplib.h> |
David S. Miller | b3e13fb | 2007-07-12 15:55:55 -0700 | [diff] [blame] | 16 | #include <asm/ldc.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 17 | |
| 18 | /* Return the child of node 'node' or zero if no this node has no |
| 19 | * direct descendent. |
| 20 | */ |
| 21 | __inline__ int |
| 22 | __prom_getchild(int node) |
| 23 | { |
| 24 | return p1275_cmd ("child", P1275_INOUT(1, 1), node); |
| 25 | } |
| 26 | |
| 27 | __inline__ int |
| 28 | prom_getchild(int node) |
| 29 | { |
| 30 | int cnode; |
| 31 | |
| 32 | if(node == -1) return 0; |
| 33 | cnode = __prom_getchild(node); |
| 34 | if(cnode == -1) return 0; |
| 35 | return (int)cnode; |
| 36 | } |
| 37 | |
| 38 | __inline__ int |
| 39 | prom_getparent(int node) |
| 40 | { |
| 41 | int cnode; |
| 42 | |
| 43 | if(node == -1) return 0; |
| 44 | cnode = p1275_cmd ("parent", P1275_INOUT(1, 1), node); |
| 45 | if(cnode == -1) return 0; |
| 46 | return (int)cnode; |
| 47 | } |
| 48 | |
| 49 | /* Return the next sibling of node 'node' or zero if no more siblings |
| 50 | * at this level of depth in the tree. |
| 51 | */ |
| 52 | __inline__ int |
| 53 | __prom_getsibling(int node) |
| 54 | { |
David S. Miller | d82ace7 | 2006-02-09 02:52:44 -0800 | [diff] [blame] | 55 | return p1275_cmd(prom_peer_name, P1275_INOUT(1, 1), node); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 56 | } |
| 57 | |
| 58 | __inline__ int |
| 59 | prom_getsibling(int node) |
| 60 | { |
| 61 | int sibnode; |
| 62 | |
David S. Miller | d82ace7 | 2006-02-09 02:52:44 -0800 | [diff] [blame] | 63 | if (node == -1) |
| 64 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 65 | sibnode = __prom_getsibling(node); |
David S. Miller | d82ace7 | 2006-02-09 02:52:44 -0800 | [diff] [blame] | 66 | if (sibnode == -1) |
| 67 | return 0; |
| 68 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 69 | return sibnode; |
| 70 | } |
| 71 | |
| 72 | /* Return the length in bytes of property 'prop' at node 'node'. |
| 73 | * Return -1 on error. |
| 74 | */ |
| 75 | __inline__ int |
David S. Miller | bff06d5 | 2005-09-22 20:11:33 -0700 | [diff] [blame] | 76 | prom_getproplen(int node, const char *prop) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 77 | { |
| 78 | if((!node) || (!prop)) return -1; |
| 79 | return p1275_cmd ("getproplen", |
| 80 | P1275_ARG(1,P1275_ARG_IN_STRING)| |
| 81 | P1275_INOUT(2, 1), |
| 82 | node, prop); |
| 83 | } |
| 84 | |
| 85 | /* Acquire a property 'prop' at node 'node' and place it in |
| 86 | * 'buffer' which has a size of 'bufsize'. If the acquisition |
| 87 | * was successful the length will be returned, else -1 is returned. |
| 88 | */ |
| 89 | __inline__ int |
David S. Miller | bff06d5 | 2005-09-22 20:11:33 -0700 | [diff] [blame] | 90 | prom_getproperty(int node, const char *prop, char *buffer, int bufsize) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 91 | { |
| 92 | int plen; |
| 93 | |
| 94 | plen = prom_getproplen(node, prop); |
David S. Miller | bff06d5 | 2005-09-22 20:11:33 -0700 | [diff] [blame] | 95 | if ((plen > bufsize) || (plen == 0) || (plen == -1)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 96 | return -1; |
David S. Miller | bff06d5 | 2005-09-22 20:11:33 -0700 | [diff] [blame] | 97 | } else { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 98 | /* Ok, things seem all right. */ |
David S. Miller | bff06d5 | 2005-09-22 20:11:33 -0700 | [diff] [blame] | 99 | return p1275_cmd(prom_getprop_name, |
| 100 | P1275_ARG(1,P1275_ARG_IN_STRING)| |
| 101 | P1275_ARG(2,P1275_ARG_OUT_BUF)| |
| 102 | P1275_INOUT(4, 1), |
| 103 | node, prop, buffer, P1275_SIZE(plen)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 104 | } |
| 105 | } |
| 106 | |
| 107 | /* Acquire an integer property and return its value. Returns -1 |
| 108 | * on failure. |
| 109 | */ |
| 110 | __inline__ int |
David S. Miller | bff06d5 | 2005-09-22 20:11:33 -0700 | [diff] [blame] | 111 | prom_getint(int node, const char *prop) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 112 | { |
| 113 | int intprop; |
| 114 | |
| 115 | if(prom_getproperty(node, prop, (char *) &intprop, sizeof(int)) != -1) |
| 116 | return intprop; |
| 117 | |
| 118 | return -1; |
| 119 | } |
| 120 | |
| 121 | /* Acquire an integer property, upon error return the passed default |
| 122 | * integer. |
| 123 | */ |
| 124 | |
| 125 | int |
David S. Miller | bff06d5 | 2005-09-22 20:11:33 -0700 | [diff] [blame] | 126 | prom_getintdefault(int node, const char *property, int deflt) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 127 | { |
| 128 | int retval; |
| 129 | |
| 130 | retval = prom_getint(node, property); |
| 131 | if(retval == -1) return deflt; |
| 132 | |
| 133 | return retval; |
| 134 | } |
| 135 | |
| 136 | /* Acquire a boolean property, 1=TRUE 0=FALSE. */ |
| 137 | int |
David S. Miller | bff06d5 | 2005-09-22 20:11:33 -0700 | [diff] [blame] | 138 | prom_getbool(int node, const char *prop) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 139 | { |
| 140 | int retval; |
| 141 | |
| 142 | retval = prom_getproplen(node, prop); |
| 143 | if(retval == -1) return 0; |
| 144 | return 1; |
| 145 | } |
| 146 | |
| 147 | /* Acquire a property whose value is a string, returns a null |
| 148 | * string on error. The char pointer is the user supplied string |
| 149 | * buffer. |
| 150 | */ |
| 151 | void |
David S. Miller | bff06d5 | 2005-09-22 20:11:33 -0700 | [diff] [blame] | 152 | prom_getstring(int node, const char *prop, char *user_buf, int ubuf_size) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 153 | { |
| 154 | int len; |
| 155 | |
| 156 | len = prom_getproperty(node, prop, user_buf, ubuf_size); |
| 157 | if(len != -1) return; |
| 158 | user_buf[0] = 0; |
| 159 | return; |
| 160 | } |
| 161 | |
| 162 | |
| 163 | /* Does the device at node 'node' have name 'name'? |
| 164 | * YES = 1 NO = 0 |
| 165 | */ |
| 166 | int |
David S. Miller | bff06d5 | 2005-09-22 20:11:33 -0700 | [diff] [blame] | 167 | prom_nodematch(int node, const char *name) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 168 | { |
| 169 | char namebuf[128]; |
| 170 | prom_getproperty(node, "name", namebuf, sizeof(namebuf)); |
| 171 | if(strcmp(namebuf, name) == 0) return 1; |
| 172 | return 0; |
| 173 | } |
| 174 | |
| 175 | /* Search siblings at 'node_start' for a node with name |
| 176 | * 'nodename'. Return node if successful, zero if not. |
| 177 | */ |
| 178 | int |
David S. Miller | bff06d5 | 2005-09-22 20:11:33 -0700 | [diff] [blame] | 179 | prom_searchsiblings(int node_start, const char *nodename) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 180 | { |
| 181 | |
| 182 | int thisnode, error; |
| 183 | char promlib_buf[128]; |
| 184 | |
| 185 | for(thisnode = node_start; thisnode; |
| 186 | thisnode=prom_getsibling(thisnode)) { |
| 187 | error = prom_getproperty(thisnode, "name", promlib_buf, |
| 188 | sizeof(promlib_buf)); |
| 189 | /* Should this ever happen? */ |
| 190 | if(error == -1) continue; |
| 191 | if(strcmp(nodename, promlib_buf)==0) return thisnode; |
| 192 | } |
| 193 | |
| 194 | return 0; |
| 195 | } |
| 196 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 197 | /* Return the first property type for node 'node'. |
| 198 | * buffer should be at least 32B in length |
| 199 | */ |
| 200 | __inline__ char * |
| 201 | prom_firstprop(int node, char *buffer) |
| 202 | { |
| 203 | *buffer = 0; |
| 204 | if(node == -1) return buffer; |
| 205 | p1275_cmd ("nextprop", P1275_ARG(2,P1275_ARG_OUT_32B)| |
| 206 | P1275_INOUT(3, 0), |
| 207 | node, (char *) 0x0, buffer); |
| 208 | return buffer; |
| 209 | } |
| 210 | |
| 211 | /* Return the property type string after property type 'oprop' |
| 212 | * at node 'node' . Returns NULL string if no more |
| 213 | * property types for this node. |
| 214 | */ |
| 215 | __inline__ char * |
David S. Miller | bff06d5 | 2005-09-22 20:11:33 -0700 | [diff] [blame] | 216 | prom_nextprop(int node, const char *oprop, char *buffer) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 217 | { |
| 218 | char buf[32]; |
| 219 | |
| 220 | if(node == -1) { |
| 221 | *buffer = 0; |
| 222 | return buffer; |
| 223 | } |
| 224 | if (oprop == buffer) { |
| 225 | strcpy (buf, oprop); |
| 226 | oprop = buf; |
| 227 | } |
| 228 | p1275_cmd ("nextprop", P1275_ARG(1,P1275_ARG_IN_STRING)| |
| 229 | P1275_ARG(2,P1275_ARG_OUT_32B)| |
| 230 | P1275_INOUT(3, 0), |
| 231 | node, oprop, buffer); |
| 232 | return buffer; |
| 233 | } |
| 234 | |
| 235 | int |
David S. Miller | bff06d5 | 2005-09-22 20:11:33 -0700 | [diff] [blame] | 236 | prom_finddevice(const char *name) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 237 | { |
David S. Miller | bff06d5 | 2005-09-22 20:11:33 -0700 | [diff] [blame] | 238 | if (!name) |
| 239 | return 0; |
| 240 | return p1275_cmd(prom_finddev_name, |
| 241 | P1275_ARG(0,P1275_ARG_IN_STRING)| |
| 242 | P1275_INOUT(1, 1), |
| 243 | name); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 244 | } |
| 245 | |
David S. Miller | bff06d5 | 2005-09-22 20:11:33 -0700 | [diff] [blame] | 246 | int prom_node_has_property(int node, const char *prop) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 247 | { |
| 248 | char buf [32]; |
| 249 | |
| 250 | *buf = 0; |
| 251 | do { |
| 252 | prom_nextprop(node, buf, buf); |
| 253 | if(!strcmp(buf, prop)) |
| 254 | return 1; |
| 255 | } while (*buf); |
| 256 | return 0; |
| 257 | } |
| 258 | |
| 259 | /* Set property 'pname' at node 'node' to value 'value' which has a length |
| 260 | * of 'size' bytes. Return the number of bytes the prom accepted. |
| 261 | */ |
| 262 | int |
David S. Miller | bff06d5 | 2005-09-22 20:11:33 -0700 | [diff] [blame] | 263 | prom_setprop(int node, const char *pname, char *value, int size) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 264 | { |
David S. Miller | b3e13fb | 2007-07-12 15:55:55 -0700 | [diff] [blame] | 265 | if (size == 0) |
| 266 | return 0; |
| 267 | if ((pname == 0) || (value == 0)) |
| 268 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 269 | |
David S. Miller | b3e13fb | 2007-07-12 15:55:55 -0700 | [diff] [blame] | 270 | #ifdef CONFIG_SUN_LDOMS |
| 271 | if (ldom_domaining_enabled) { |
| 272 | ldom_set_var(pname, value); |
| 273 | return 0; |
| 274 | } |
| 275 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 276 | return p1275_cmd ("setprop", P1275_ARG(1,P1275_ARG_IN_STRING)| |
| 277 | P1275_ARG(2,P1275_ARG_IN_BUF)| |
| 278 | P1275_INOUT(4, 1), |
| 279 | node, pname, value, P1275_SIZE(size)); |
| 280 | } |
| 281 | |
| 282 | __inline__ int |
| 283 | prom_inst2pkg(int inst) |
| 284 | { |
| 285 | int node; |
| 286 | |
| 287 | node = p1275_cmd ("instance-to-package", P1275_INOUT(1, 1), inst); |
| 288 | if (node == -1) return 0; |
| 289 | return node; |
| 290 | } |
| 291 | |
| 292 | /* Return 'node' assigned to a particular prom 'path' |
| 293 | * FIXME: Should work for v0 as well |
| 294 | */ |
| 295 | int |
David S. Miller | bff06d5 | 2005-09-22 20:11:33 -0700 | [diff] [blame] | 296 | prom_pathtoinode(const char *path) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 297 | { |
| 298 | int node, inst; |
| 299 | |
| 300 | inst = prom_devopen (path); |
| 301 | if (inst == 0) return 0; |
| 302 | node = prom_inst2pkg (inst); |
| 303 | prom_devclose (inst); |
| 304 | if (node == -1) return 0; |
| 305 | return node; |
| 306 | } |
David S. Miller | c73fcc8 | 2007-07-20 16:59:26 -0700 | [diff] [blame] | 307 | |
| 308 | int prom_ihandle2path(int handle, char *buffer, int bufsize) |
| 309 | { |
| 310 | return p1275_cmd("instance-to-path", |
| 311 | P1275_ARG(1,P1275_ARG_OUT_BUF)| |
| 312 | P1275_INOUT(3, 1), |
| 313 | handle, buffer, P1275_SIZE(bufsize)); |
| 314 | } |