394 lines
7.9 KiB
C
Executable file
394 lines
7.9 KiB
C
Executable file
// SPDX-License-Identifier: GPL-2.0
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/*
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* tree.c: Basic device tree traversal/scanning for the Linux
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* prom library.
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*
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* Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu)
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* Copyright (C) 1996,1997 Jakub Jelinek (jj@sunsite.mff.cuni.cz)
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*/
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#include <linux/string.h>
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#include <linux/types.h>
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#include <linux/kernel.h>
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#include <linux/sched.h>
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#include <linux/module.h>
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#include <asm/openprom.h>
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#include <asm/oplib.h>
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#include <asm/ldc.h>
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static phandle prom_node_to_node(const char *type, phandle node)
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{
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unsigned long args[5];
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args[0] = (unsigned long) type;
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args[1] = 1;
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args[2] = 1;
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args[3] = (unsigned int) node;
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args[4] = (unsigned long) -1;
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p1275_cmd_direct(args);
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return (phandle) args[4];
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}
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/* Return the child of node 'node' or zero if no this node has no
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* direct descendent.
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*/
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inline phandle __prom_getchild(phandle node)
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{
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return prom_node_to_node("child", node);
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}
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phandle prom_getchild(phandle node)
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{
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phandle cnode;
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if ((s32)node == -1)
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return 0;
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cnode = __prom_getchild(node);
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if ((s32)cnode == -1)
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return 0;
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return cnode;
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}
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EXPORT_SYMBOL(prom_getchild);
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inline phandle prom_getparent(phandle node)
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{
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phandle cnode;
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if ((s32)node == -1)
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return 0;
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cnode = prom_node_to_node("parent", node);
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if ((s32)cnode == -1)
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return 0;
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return cnode;
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}
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/* Return the next sibling of node 'node' or zero if no more siblings
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* at this level of depth in the tree.
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*/
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inline phandle __prom_getsibling(phandle node)
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{
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return prom_node_to_node(prom_peer_name, node);
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}
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phandle prom_getsibling(phandle node)
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{
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phandle sibnode;
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if ((s32)node == -1)
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return 0;
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sibnode = __prom_getsibling(node);
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if ((s32)sibnode == -1)
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return 0;
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return sibnode;
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}
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EXPORT_SYMBOL(prom_getsibling);
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/* Return the length in bytes of property 'prop' at node 'node'.
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* Return -1 on error.
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*/
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int prom_getproplen(phandle node, const char *prop)
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{
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unsigned long args[6];
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if (!node || !prop)
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return -1;
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args[0] = (unsigned long) "getproplen";
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args[1] = 2;
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args[2] = 1;
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args[3] = (unsigned int) node;
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args[4] = (unsigned long) prop;
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args[5] = (unsigned long) -1;
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p1275_cmd_direct(args);
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return (int) args[5];
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}
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EXPORT_SYMBOL(prom_getproplen);
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/* Acquire a property 'prop' at node 'node' and place it in
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* 'buffer' which has a size of 'bufsize'. If the acquisition
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* was successful the length will be returned, else -1 is returned.
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*/
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int prom_getproperty(phandle node, const char *prop,
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char *buffer, int bufsize)
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{
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unsigned long args[8];
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int plen;
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plen = prom_getproplen(node, prop);
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if ((plen > bufsize) || (plen == 0) || (plen == -1))
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return -1;
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args[0] = (unsigned long) prom_getprop_name;
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args[1] = 4;
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args[2] = 1;
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args[3] = (unsigned int) node;
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args[4] = (unsigned long) prop;
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args[5] = (unsigned long) buffer;
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args[6] = bufsize;
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args[7] = (unsigned long) -1;
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p1275_cmd_direct(args);
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return (int) args[7];
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}
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EXPORT_SYMBOL(prom_getproperty);
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/* Acquire an integer property and return its value. Returns -1
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* on failure.
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*/
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int prom_getint(phandle node, const char *prop)
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{
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int intprop;
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if (prom_getproperty(node, prop, (char *) &intprop, sizeof(int)) != -1)
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return intprop;
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return -1;
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}
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EXPORT_SYMBOL(prom_getint);
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/* Acquire an integer property, upon error return the passed default
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* integer.
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*/
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int prom_getintdefault(phandle node, const char *property, int deflt)
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{
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int retval;
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retval = prom_getint(node, property);
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if (retval == -1)
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return deflt;
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return retval;
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}
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EXPORT_SYMBOL(prom_getintdefault);
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/* Acquire a boolean property, 1=TRUE 0=FALSE. */
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int prom_getbool(phandle node, const char *prop)
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{
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int retval;
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retval = prom_getproplen(node, prop);
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if (retval == -1)
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return 0;
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return 1;
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}
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EXPORT_SYMBOL(prom_getbool);
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/* Acquire a property whose value is a string, returns a null
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* string on error. The char pointer is the user supplied string
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* buffer.
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*/
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void prom_getstring(phandle node, const char *prop, char *user_buf,
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int ubuf_size)
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{
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int len;
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len = prom_getproperty(node, prop, user_buf, ubuf_size);
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if (len != -1)
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return;
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user_buf[0] = 0;
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}
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EXPORT_SYMBOL(prom_getstring);
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/* Does the device at node 'node' have name 'name'?
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* YES = 1 NO = 0
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*/
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int prom_nodematch(phandle node, const char *name)
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{
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char namebuf[128];
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prom_getproperty(node, "name", namebuf, sizeof(namebuf));
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if (strcmp(namebuf, name) == 0)
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return 1;
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return 0;
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}
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/* Search siblings at 'node_start' for a node with name
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* 'nodename'. Return node if successful, zero if not.
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*/
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phandle prom_searchsiblings(phandle node_start, const char *nodename)
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{
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phandle thisnode;
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int error;
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char promlib_buf[128];
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for(thisnode = node_start; thisnode;
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thisnode=prom_getsibling(thisnode)) {
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error = prom_getproperty(thisnode, "name", promlib_buf,
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sizeof(promlib_buf));
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/* Should this ever happen? */
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if(error == -1) continue;
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if(strcmp(nodename, promlib_buf)==0) return thisnode;
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}
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return 0;
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}
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EXPORT_SYMBOL(prom_searchsiblings);
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static const char *prom_nextprop_name = "nextprop";
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/* Return the first property type for node 'node'.
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* buffer should be at least 32B in length
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*/
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char *prom_firstprop(phandle node, char *buffer)
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{
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unsigned long args[7];
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*buffer = 0;
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if ((s32)node == -1)
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return buffer;
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args[0] = (unsigned long) prom_nextprop_name;
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args[1] = 3;
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args[2] = 1;
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args[3] = (unsigned int) node;
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args[4] = 0;
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args[5] = (unsigned long) buffer;
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args[6] = (unsigned long) -1;
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p1275_cmd_direct(args);
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return buffer;
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}
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EXPORT_SYMBOL(prom_firstprop);
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/* Return the property type string after property type 'oprop'
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* at node 'node' . Returns NULL string if no more
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* property types for this node.
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*/
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char *prom_nextprop(phandle node, const char *oprop, char *buffer)
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{
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unsigned long args[7];
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char buf[32];
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if ((s32)node == -1) {
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*buffer = 0;
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return buffer;
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}
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if (oprop == buffer) {
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strcpy (buf, oprop);
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oprop = buf;
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}
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args[0] = (unsigned long) prom_nextprop_name;
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args[1] = 3;
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args[2] = 1;
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args[3] = (unsigned int) node;
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args[4] = (unsigned long) oprop;
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args[5] = (unsigned long) buffer;
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args[6] = (unsigned long) -1;
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p1275_cmd_direct(args);
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return buffer;
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}
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EXPORT_SYMBOL(prom_nextprop);
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phandle prom_finddevice(const char *name)
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{
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unsigned long args[5];
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if (!name)
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return 0;
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args[0] = (unsigned long) "finddevice";
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args[1] = 1;
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args[2] = 1;
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args[3] = (unsigned long) name;
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args[4] = (unsigned long) -1;
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p1275_cmd_direct(args);
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return (int) args[4];
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}
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EXPORT_SYMBOL(prom_finddevice);
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int prom_node_has_property(phandle node, const char *prop)
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{
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char buf [32];
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*buf = 0;
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do {
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prom_nextprop(node, buf, buf);
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if (!strcmp(buf, prop))
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return 1;
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} while (*buf);
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return 0;
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}
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EXPORT_SYMBOL(prom_node_has_property);
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/* Set property 'pname' at node 'node' to value 'value' which has a length
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* of 'size' bytes. Return the number of bytes the prom accepted.
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*/
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int
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prom_setprop(phandle node, const char *pname, char *value, int size)
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{
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unsigned long args[8];
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if (size == 0)
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return 0;
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if ((pname == 0) || (value == 0))
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return 0;
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#ifdef CONFIG_SUN_LDOMS
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if (ldom_domaining_enabled) {
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ldom_set_var(pname, value);
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return 0;
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}
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#endif
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args[0] = (unsigned long) "setprop";
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args[1] = 4;
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args[2] = 1;
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args[3] = (unsigned int) node;
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args[4] = (unsigned long) pname;
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args[5] = (unsigned long) value;
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args[6] = size;
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args[7] = (unsigned long) -1;
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p1275_cmd_direct(args);
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return (int) args[7];
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}
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EXPORT_SYMBOL(prom_setprop);
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inline phandle prom_inst2pkg(int inst)
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{
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unsigned long args[5];
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phandle node;
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args[0] = (unsigned long) "instance-to-package";
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args[1] = 1;
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args[2] = 1;
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args[3] = (unsigned int) inst;
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args[4] = (unsigned long) -1;
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p1275_cmd_direct(args);
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node = (int) args[4];
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if ((s32)node == -1)
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return 0;
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return node;
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}
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int prom_ihandle2path(int handle, char *buffer, int bufsize)
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{
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unsigned long args[7];
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args[0] = (unsigned long) "instance-to-path";
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args[1] = 3;
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args[2] = 1;
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args[3] = (unsigned int) handle;
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args[4] = (unsigned long) buffer;
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args[5] = bufsize;
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args[6] = (unsigned long) -1;
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p1275_cmd_direct(args);
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return (int) args[6];
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}
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