--- /dev/null
+/*
+ * tree.c: Basic device tree traversal/scanning for the Linux
+ * prom library.
+ *
+ * Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu)
+ * Copyright (C) 1996,1997 Jakub Jelinek (jj@sunsite.mff.cuni.cz)
+ */
+
+#include <linux/string.h>
+#include <linux/types.h>
+#include <linux/kernel.h>
+#include <linux/sched.h>
+#include <linux/module.h>
+
+#include <asm/openprom.h>
+#include <asm/oplib.h>
+#include <asm/ldc.h>
+
+static phandle prom_node_to_node(const char *type, phandle node)
+{
+ unsigned long args[5];
+
+ args[0] = (unsigned long) type;
+ args[1] = 1;
+ args[2] = 1;
+ args[3] = (unsigned int) node;
+ args[4] = (unsigned long) -1;
+
+ p1275_cmd_direct(args);
+
+ return (phandle) args[4];
+}
+
+/* Return the child of node 'node' or zero if no this node has no
+ * direct descendent.
+ */
+inline phandle __prom_getchild(phandle node)
+{
+ return prom_node_to_node("child", node);
+}
+
+phandle prom_getchild(phandle node)
+{
+ phandle cnode;
+
+ if ((s32)node == -1)
+ return 0;
+ cnode = __prom_getchild(node);
+ if ((s32)cnode == -1)
+ return 0;
+ return cnode;
+}
+EXPORT_SYMBOL(prom_getchild);
+
+inline phandle prom_getparent(phandle node)
+{
+ phandle cnode;
+
+ if ((s32)node == -1)
+ return 0;
+ cnode = prom_node_to_node("parent", node);
+ if ((s32)cnode == -1)
+ return 0;
+ return cnode;
+}
+
+/* Return the next sibling of node 'node' or zero if no more siblings
+ * at this level of depth in the tree.
+ */
+inline phandle __prom_getsibling(phandle node)
+{
+ return prom_node_to_node(prom_peer_name, node);
+}
+
+phandle prom_getsibling(phandle node)
+{
+ phandle sibnode;
+
+ if ((s32)node == -1)
+ return 0;
+ sibnode = __prom_getsibling(node);
+ if ((s32)sibnode == -1)
+ return 0;
+
+ return sibnode;
+}
+EXPORT_SYMBOL(prom_getsibling);
+
+/* Return the length in bytes of property 'prop' at node 'node'.
+ * Return -1 on error.
+ */
+int prom_getproplen(phandle node, const char *prop)
+{
+ unsigned long args[6];
+
+ if (!node || !prop)
+ return -1;
+
+ args[0] = (unsigned long) "getproplen";
+ args[1] = 2;
+ args[2] = 1;
+ args[3] = (unsigned int) node;
+ args[4] = (unsigned long) prop;
+ args[5] = (unsigned long) -1;
+
+ p1275_cmd_direct(args);
+
+ return (int) args[5];
+}
+EXPORT_SYMBOL(prom_getproplen);
+
+/* Acquire a property 'prop' at node 'node' and place it in
+ * 'buffer' which has a size of 'bufsize'. If the acquisition
+ * was successful the length will be returned, else -1 is returned.
+ */
+int prom_getproperty(phandle node, const char *prop,
+ char *buffer, int bufsize)
+{
+ unsigned long args[8];
+ int plen;
+
+ plen = prom_getproplen(node, prop);
+ if ((plen > bufsize) || (plen == 0) || (plen == -1))
+ return -1;
+
+ args[0] = (unsigned long) prom_getprop_name;
+ args[1] = 4;
+ args[2] = 1;
+ args[3] = (unsigned int) node;
+ args[4] = (unsigned long) prop;
+ args[5] = (unsigned long) buffer;
+ args[6] = bufsize;
+ args[7] = (unsigned long) -1;
+
+ p1275_cmd_direct(args);
+
+ return (int) args[7];
+}
+EXPORT_SYMBOL(prom_getproperty);
+
+/* Acquire an integer property and return its value. Returns -1
+ * on failure.
+ */
+int prom_getint(phandle node, const char *prop)
+{
+ int intprop;
+
+ if (prom_getproperty(node, prop, (char *) &intprop, sizeof(int)) != -1)
+ return intprop;
+
+ return -1;
+}
+EXPORT_SYMBOL(prom_getint);
+
+/* Acquire an integer property, upon error return the passed default
+ * integer.
+ */
+
+int prom_getintdefault(phandle node, const char *property, int deflt)
+{
+ int retval;
+
+ retval = prom_getint(node, property);
+ if (retval == -1)
+ return deflt;
+
+ return retval;
+}
+EXPORT_SYMBOL(prom_getintdefault);
+
+/* Acquire a boolean property, 1=TRUE 0=FALSE. */
+int prom_getbool(phandle node, const char *prop)
+{
+ int retval;
+
+ retval = prom_getproplen(node, prop);
+ if (retval == -1)
+ return 0;
+ return 1;
+}
+EXPORT_SYMBOL(prom_getbool);
+
+/* Acquire a property whose value is a string, returns a null
+ * string on error. The char pointer is the user supplied string
+ * buffer.
+ */
+void prom_getstring(phandle node, const char *prop, char *user_buf,
+ int ubuf_size)
+{
+ int len;
+
+ len = prom_getproperty(node, prop, user_buf, ubuf_size);
+ if (len != -1)
+ return;
+ user_buf[0] = 0;
+}
+EXPORT_SYMBOL(prom_getstring);
+
+/* Does the device at node 'node' have name 'name'?
+ * YES = 1 NO = 0
+ */
+int prom_nodematch(phandle node, const char *name)
+{
+ char namebuf[128];
+ prom_getproperty(node, "name", namebuf, sizeof(namebuf));
+ if (strcmp(namebuf, name) == 0)
+ return 1;
+ return 0;
+}
+
+/* Search siblings at 'node_start' for a node with name
+ * 'nodename'. Return node if successful, zero if not.
+ */
+phandle prom_searchsiblings(phandle node_start, const char *nodename)
+{
+ phandle thisnode;
+ int error;
+ char promlib_buf[128];
+
+ for(thisnode = node_start; thisnode;
+ thisnode=prom_getsibling(thisnode)) {
+ error = prom_getproperty(thisnode, "name", promlib_buf,
+ sizeof(promlib_buf));
+ /* Should this ever happen? */
+ if(error == -1) continue;
+ if(strcmp(nodename, promlib_buf)==0) return thisnode;
+ }
+
+ return 0;
+}
+EXPORT_SYMBOL(prom_searchsiblings);
+
+static const char *prom_nextprop_name = "nextprop";
+
+/* Return the first property type for node 'node'.
+ * buffer should be at least 32B in length
+ */
+char *prom_firstprop(phandle node, char *buffer)
+{
+ unsigned long args[7];
+
+ *buffer = 0;
+ if ((s32)node == -1)
+ return buffer;
+
+ args[0] = (unsigned long) prom_nextprop_name;
+ args[1] = 3;
+ args[2] = 1;
+ args[3] = (unsigned int) node;
+ args[4] = 0;
+ args[5] = (unsigned long) buffer;
+ args[6] = (unsigned long) -1;
+
+ p1275_cmd_direct(args);
+
+ return buffer;
+}
+EXPORT_SYMBOL(prom_firstprop);
+
+/* Return the property type string after property type 'oprop'
+ * at node 'node' . Returns NULL string if no more
+ * property types for this node.
+ */
+char *prom_nextprop(phandle node, const char *oprop, char *buffer)
+{
+ unsigned long args[7];
+ char buf[32];
+
+ if ((s32)node == -1) {
+ *buffer = 0;
+ return buffer;
+ }
+ if (oprop == buffer) {
+ strcpy (buf, oprop);
+ oprop = buf;
+ }
+
+ args[0] = (unsigned long) prom_nextprop_name;
+ args[1] = 3;
+ args[2] = 1;
+ args[3] = (unsigned int) node;
+ args[4] = (unsigned long) oprop;
+ args[5] = (unsigned long) buffer;
+ args[6] = (unsigned long) -1;
+
+ p1275_cmd_direct(args);
+
+ return buffer;
+}
+EXPORT_SYMBOL(prom_nextprop);
+
+phandle prom_finddevice(const char *name)
+{
+ unsigned long args[5];
+
+ if (!name)
+ return 0;
+ args[0] = (unsigned long) "finddevice";
+ args[1] = 1;
+ args[2] = 1;
+ args[3] = (unsigned long) name;
+ args[4] = (unsigned long) -1;
+
+ p1275_cmd_direct(args);
+
+ return (int) args[4];
+}
+EXPORT_SYMBOL(prom_finddevice);
+
+int prom_node_has_property(phandle node, const char *prop)
+{
+ char buf [32];
+
+ *buf = 0;
+ do {
+ prom_nextprop(node, buf, buf);
+ if (!strcmp(buf, prop))
+ return 1;
+ } while (*buf);
+ return 0;
+}
+EXPORT_SYMBOL(prom_node_has_property);
+
+/* Set property 'pname' at node 'node' to value 'value' which has a length
+ * of 'size' bytes. Return the number of bytes the prom accepted.
+ */
+int
+prom_setprop(phandle node, const char *pname, char *value, int size)
+{
+ unsigned long args[8];
+
+ if (size == 0)
+ return 0;
+ if ((pname == 0) || (value == 0))
+ return 0;
+
+#ifdef CONFIG_SUN_LDOMS
+ if (ldom_domaining_enabled) {
+ ldom_set_var(pname, value);
+ return 0;
+ }
+#endif
+ args[0] = (unsigned long) "setprop";
+ args[1] = 4;
+ args[2] = 1;
+ args[3] = (unsigned int) node;
+ args[4] = (unsigned long) pname;
+ args[5] = (unsigned long) value;
+ args[6] = size;
+ args[7] = (unsigned long) -1;
+
+ p1275_cmd_direct(args);
+
+ return (int) args[7];
+}
+EXPORT_SYMBOL(prom_setprop);
+
+inline phandle prom_inst2pkg(int inst)
+{
+ unsigned long args[5];
+ phandle node;
+
+ args[0] = (unsigned long) "instance-to-package";
+ args[1] = 1;
+ args[2] = 1;
+ args[3] = (unsigned int) inst;
+ args[4] = (unsigned long) -1;
+
+ p1275_cmd_direct(args);
+
+ node = (int) args[4];
+ if ((s32)node == -1)
+ return 0;
+ return node;
+}
+
+int prom_ihandle2path(int handle, char *buffer, int bufsize)
+{
+ unsigned long args[7];
+
+ args[0] = (unsigned long) "instance-to-path";
+ args[1] = 3;
+ args[2] = 1;
+ args[3] = (unsigned int) handle;
+ args[4] = (unsigned long) buffer;
+ args[5] = bufsize;
+ args[6] = (unsigned long) -1;
+
+ p1275_cmd_direct(args);
+
+ return (int) args[6];
+}
Code Review / kvmfornfv.git / blobdiff