163 lines
3.6 KiB
C
163 lines
3.6 KiB
C
/* prom_common.c: OF device tree support common code.
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*
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* Paul Mackerras August 1996.
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* Copyright (C) 1996-2005 Paul Mackerras.
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*
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* Adapted for 64bit PowerPC by Dave Engebretsen and Peter Bergner.
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* {engebret|bergner}@us.ibm.com
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*
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* Adapted for sparc by David S. Miller davem@davemloft.net
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*/
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#include <linux/kernel.h>
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#include <linux/export.h>
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#include <linux/errno.h>
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#include <linux/mutex.h>
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#include <linux/slab.h>
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#include <linux/of.h>
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#include <linux/of_pdt.h>
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#include <asm/prom.h>
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#include <asm/oplib.h>
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#include "prom.h"
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struct device_node *of_console_device;
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EXPORT_SYMBOL(of_console_device);
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char *of_console_path;
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EXPORT_SYMBOL(of_console_path);
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char *of_console_options;
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EXPORT_SYMBOL(of_console_options);
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int of_getintprop_default(struct device_node *np, const char *name, int def)
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{
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struct property *prop;
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int len;
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prop = of_find_property(np, name, &len);
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if (!prop || len != 4)
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return def;
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return *(int *) prop->value;
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}
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EXPORT_SYMBOL(of_getintprop_default);
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DEFINE_MUTEX(of_set_property_mutex);
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EXPORT_SYMBOL(of_set_property_mutex);
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int of_set_property(struct device_node *dp, const char *name, void *val, int len)
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{
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struct property **prevp;
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unsigned long flags;
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void *new_val;
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int err;
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new_val = kmemdup(val, len, GFP_KERNEL);
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if (!new_val)
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return -ENOMEM;
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err = -ENODEV;
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mutex_lock(&of_set_property_mutex);
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raw_spin_lock_irqsave(&devtree_lock, flags);
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prevp = &dp->properties;
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while (*prevp) {
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struct property *prop = *prevp;
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if (!strcasecmp(prop->name, name)) {
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void *old_val = prop->value;
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int ret;
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ret = prom_setprop(dp->phandle, name, val, len);
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err = -EINVAL;
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if (ret >= 0) {
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prop->value = new_val;
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prop->length = len;
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if (OF_IS_DYNAMIC(prop))
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kfree(old_val);
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OF_MARK_DYNAMIC(prop);
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err = 0;
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}
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break;
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}
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prevp = &(*prevp)->next;
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}
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raw_spin_unlock_irqrestore(&devtree_lock, flags);
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mutex_unlock(&of_set_property_mutex);
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/* XXX Upate procfs if necessary... */
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return err;
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}
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EXPORT_SYMBOL(of_set_property);
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int of_find_in_proplist(const char *list, const char *match, int len)
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{
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while (len > 0) {
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int l;
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if (!strcmp(list, match))
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return 1;
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l = strlen(list) + 1;
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list += l;
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len -= l;
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}
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return 0;
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}
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EXPORT_SYMBOL(of_find_in_proplist);
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/*
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* SPARC32 and SPARC64's prom_nextprop() do things differently
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* here, despite sharing the same interface. SPARC32 doesn't fill in 'buf',
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* returning NULL on an error. SPARC64 fills in 'buf', but sets it to an
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* empty string upon error.
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*/
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static int __init handle_nextprop_quirks(char *buf, const char *name)
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{
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if (!name || strlen(name) == 0)
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return -1;
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#ifdef CONFIG_SPARC32
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strcpy(buf, name);
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#endif
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return 0;
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}
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static int __init prom_common_nextprop(phandle node, char *prev, char *buf)
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{
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const char *name;
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buf[0] = '\0';
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name = prom_nextprop(node, prev, buf);
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return handle_nextprop_quirks(buf, name);
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}
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unsigned int prom_early_allocated __initdata;
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static struct of_pdt_ops prom_sparc_ops __initdata = {
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.nextprop = prom_common_nextprop,
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.getproplen = prom_getproplen,
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.getproperty = prom_getproperty,
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.getchild = prom_getchild,
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.getsibling = prom_getsibling,
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};
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void __init prom_build_devicetree(void)
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{
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of_pdt_build_devicetree(prom_root_node, &prom_sparc_ops);
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of_console_init();
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pr_info("PROM: Built device tree with %u bytes of memory.\n",
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prom_early_allocated);
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}
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