568 lines
12 KiB
C
568 lines
12 KiB
C
/*
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* Procedures for creating, accessing and interpreting the device tree.
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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 sparc32 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/types.h>
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#include <linux/string.h>
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#include <linux/mm.h>
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#include <linux/bootmem.h>
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#include <linux/module.h>
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#include <asm/prom.h>
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#include <asm/oplib.h>
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extern struct device_node *allnodes; /* temporary while merging */
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extern rwlock_t devtree_lock; /* temporary while merging */
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struct device_node *of_find_node_by_phandle(phandle handle)
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{
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struct device_node *np;
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for (np = allnodes; np != 0; np = np->allnext)
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if (np->node == handle)
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break;
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return np;
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}
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EXPORT_SYMBOL(of_find_node_by_phandle);
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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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void *new_val;
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int err;
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new_val = kmalloc(len, GFP_KERNEL);
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if (!new_val)
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return -ENOMEM;
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memcpy(new_val, val, len);
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err = -ENODEV;
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write_lock(&devtree_lock);
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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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mutex_lock(&of_set_property_mutex);
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ret = prom_setprop(dp->node, (char *) name, val, len);
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mutex_unlock(&of_set_property_mutex);
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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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write_unlock(&devtree_lock);
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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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static unsigned int prom_early_allocated;
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static void * __init prom_early_alloc(unsigned long size)
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{
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void *ret;
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ret = __alloc_bootmem(size, SMP_CACHE_BYTES, 0UL);
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if (ret != NULL)
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memset(ret, 0, size);
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prom_early_allocated += size;
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return ret;
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}
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static int is_root_node(const struct device_node *dp)
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{
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if (!dp)
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return 0;
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return (dp->parent == NULL);
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}
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/* The following routines deal with the black magic of fully naming a
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* node.
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*
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* Certain well known named nodes are just the simple name string.
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*
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* Actual devices have an address specifier appended to the base name
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* string, like this "foo@addr". The "addr" can be in any number of
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* formats, and the platform plus the type of the node determine the
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* format and how it is constructed.
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*
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* For children of the ROOT node, the naming convention is fixed and
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* determined by whether this is a sun4u or sun4v system.
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*
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* For children of other nodes, it is bus type specific. So
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* we walk up the tree until we discover a "device_type" property
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* we recognize and we go from there.
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*/
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static void __init sparc32_path_component(struct device_node *dp, char *tmp_buf)
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{
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struct linux_prom_registers *regs;
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struct property *rprop;
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rprop = of_find_property(dp, "reg", NULL);
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if (!rprop)
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return;
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regs = rprop->value;
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sprintf(tmp_buf, "%s@%x,%x",
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dp->name,
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regs->which_io, regs->phys_addr);
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}
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/* "name@slot,offset" */
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static void __init sbus_path_component(struct device_node *dp, char *tmp_buf)
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{
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struct linux_prom_registers *regs;
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struct property *prop;
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prop = of_find_property(dp, "reg", NULL);
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if (!prop)
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return;
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regs = prop->value;
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sprintf(tmp_buf, "%s@%x,%x",
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dp->name,
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regs->which_io,
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regs->phys_addr);
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}
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/* "name@devnum[,func]" */
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static void __init pci_path_component(struct device_node *dp, char *tmp_buf)
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{
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struct linux_prom_pci_registers *regs;
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struct property *prop;
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unsigned int devfn;
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prop = of_find_property(dp, "reg", NULL);
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if (!prop)
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return;
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regs = prop->value;
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devfn = (regs->phys_hi >> 8) & 0xff;
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if (devfn & 0x07) {
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sprintf(tmp_buf, "%s@%x,%x",
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dp->name,
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devfn >> 3,
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devfn & 0x07);
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} else {
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sprintf(tmp_buf, "%s@%x",
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dp->name,
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devfn >> 3);
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}
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}
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/* "name@addrhi,addrlo" */
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static void __init ebus_path_component(struct device_node *dp, char *tmp_buf)
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{
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struct linux_prom_registers *regs;
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struct property *prop;
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prop = of_find_property(dp, "reg", NULL);
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if (!prop)
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return;
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regs = prop->value;
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sprintf(tmp_buf, "%s@%x,%x",
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dp->name,
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regs->which_io, regs->phys_addr);
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}
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static void __init __build_path_component(struct device_node *dp, char *tmp_buf)
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{
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struct device_node *parent = dp->parent;
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if (parent != NULL) {
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if (!strcmp(parent->type, "pci") ||
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!strcmp(parent->type, "pciex"))
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return pci_path_component(dp, tmp_buf);
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if (!strcmp(parent->type, "sbus"))
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return sbus_path_component(dp, tmp_buf);
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if (!strcmp(parent->type, "ebus"))
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return ebus_path_component(dp, tmp_buf);
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/* "isa" is handled with platform naming */
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}
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/* Use platform naming convention. */
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return sparc32_path_component(dp, tmp_buf);
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}
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static char * __init build_path_component(struct device_node *dp)
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{
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char tmp_buf[64], *n;
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tmp_buf[0] = '\0';
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__build_path_component(dp, tmp_buf);
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if (tmp_buf[0] == '\0')
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strcpy(tmp_buf, dp->name);
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n = prom_early_alloc(strlen(tmp_buf) + 1);
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strcpy(n, tmp_buf);
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return n;
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}
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static char * __init build_full_name(struct device_node *dp)
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{
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int len, ourlen, plen;
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char *n;
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plen = strlen(dp->parent->full_name);
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ourlen = strlen(dp->path_component_name);
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len = ourlen + plen + 2;
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n = prom_early_alloc(len);
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strcpy(n, dp->parent->full_name);
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if (!is_root_node(dp->parent)) {
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strcpy(n + plen, "/");
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plen++;
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}
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strcpy(n + plen, dp->path_component_name);
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return n;
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}
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static unsigned int unique_id;
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static struct property * __init build_one_prop(phandle node, char *prev, char *special_name, void *special_val, int special_len)
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{
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static struct property *tmp = NULL;
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struct property *p;
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int len;
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const char *name;
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if (tmp) {
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p = tmp;
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memset(p, 0, sizeof(*p) + 32);
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tmp = NULL;
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} else {
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p = prom_early_alloc(sizeof(struct property) + 32);
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p->unique_id = unique_id++;
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}
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p->name = (char *) (p + 1);
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if (special_name) {
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strcpy(p->name, special_name);
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p->length = special_len;
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p->value = prom_early_alloc(special_len);
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memcpy(p->value, special_val, special_len);
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} else {
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if (prev == NULL) {
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name = prom_firstprop(node, NULL);
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} else {
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name = prom_nextprop(node, prev, NULL);
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}
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if (strlen(name) == 0) {
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tmp = p;
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return NULL;
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}
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strcpy(p->name, name);
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p->length = prom_getproplen(node, p->name);
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if (p->length <= 0) {
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p->length = 0;
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} else {
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p->value = prom_early_alloc(p->length + 1);
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len = prom_getproperty(node, p->name, p->value,
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p->length);
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if (len <= 0)
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p->length = 0;
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((unsigned char *)p->value)[p->length] = '\0';
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}
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}
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return p;
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}
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static struct property * __init build_prop_list(phandle node)
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{
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struct property *head, *tail;
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head = tail = build_one_prop(node, NULL,
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".node", &node, sizeof(node));
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tail->next = build_one_prop(node, NULL, NULL, NULL, 0);
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tail = tail->next;
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while(tail) {
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tail->next = build_one_prop(node, tail->name,
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NULL, NULL, 0);
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tail = tail->next;
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}
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return head;
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}
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static char * __init get_one_property(phandle node, char *name)
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{
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char *buf = "<NULL>";
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int len;
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len = prom_getproplen(node, name);
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if (len > 0) {
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buf = prom_early_alloc(len);
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len = prom_getproperty(node, name, buf, len);
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}
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return buf;
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}
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static struct device_node * __init create_node(phandle node)
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{
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struct device_node *dp;
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if (!node)
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return NULL;
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dp = prom_early_alloc(sizeof(*dp));
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dp->unique_id = unique_id++;
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kref_init(&dp->kref);
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dp->name = get_one_property(node, "name");
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dp->type = get_one_property(node, "device_type");
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dp->node = node;
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/* Build interrupts later... */
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dp->properties = build_prop_list(node);
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return dp;
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}
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static struct device_node * __init build_tree(struct device_node *parent, phandle node, struct device_node ***nextp)
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{
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struct device_node *dp;
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dp = create_node(node);
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if (dp) {
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*(*nextp) = dp;
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*nextp = &dp->allnext;
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dp->parent = parent;
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dp->path_component_name = build_path_component(dp);
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dp->full_name = build_full_name(dp);
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dp->child = build_tree(dp, prom_getchild(node), nextp);
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dp->sibling = build_tree(parent, prom_getsibling(node), nextp);
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}
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return dp;
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}
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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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extern void restore_current(void);
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static void __init of_console_init(void)
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{
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char *msg = "OF stdout device is: %s\n";
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struct device_node *dp;
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unsigned long flags;
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const char *type;
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phandle node;
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int skip, tmp, fd;
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of_console_path = prom_early_alloc(256);
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switch (prom_vers) {
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case PROM_V0:
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case PROM_SUN4:
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skip = 0;
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switch (*romvec->pv_stdout) {
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case PROMDEV_SCREEN:
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type = "display";
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break;
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case PROMDEV_TTYB:
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skip = 1;
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/* FALLTHRU */
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case PROMDEV_TTYA:
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type = "serial";
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break;
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default:
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prom_printf("Invalid PROM_V0 stdout value %u\n",
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*romvec->pv_stdout);
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prom_halt();
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}
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tmp = skip;
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for_each_node_by_type(dp, type) {
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if (!tmp--)
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break;
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}
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if (!dp) {
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prom_printf("Cannot find PROM_V0 console node.\n");
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prom_halt();
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}
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of_console_device = dp;
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strcpy(of_console_path, dp->full_name);
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if (!strcmp(type, "serial")) {
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strcat(of_console_path,
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(skip ? ":b" : ":a"));
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}
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break;
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default:
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case PROM_V2:
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case PROM_V3:
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fd = *romvec->pv_v2bootargs.fd_stdout;
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spin_lock_irqsave(&prom_lock, flags);
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node = (*romvec->pv_v2devops.v2_inst2pkg)(fd);
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restore_current();
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spin_unlock_irqrestore(&prom_lock, flags);
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if (!node) {
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prom_printf("Cannot resolve stdout node from "
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"instance %08x.\n", fd);
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prom_halt();
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}
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dp = of_find_node_by_phandle(node);
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type = of_get_property(dp, "device_type", NULL);
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if (!type) {
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prom_printf("Console stdout lacks "
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"device_type property.\n");
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prom_halt();
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}
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if (strcmp(type, "display") && strcmp(type, "serial")) {
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prom_printf("Console device_type is neither display "
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"nor serial.\n");
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prom_halt();
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}
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of_console_device = dp;
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if (prom_vers == PROM_V2) {
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strcpy(of_console_path, dp->full_name);
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switch (*romvec->pv_stdout) {
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case PROMDEV_TTYA:
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strcat(of_console_path, ":a");
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break;
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case PROMDEV_TTYB:
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strcat(of_console_path, ":b");
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break;
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}
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} else {
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const char *path;
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dp = of_find_node_by_path("/");
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path = of_get_property(dp, "stdout-path", NULL);
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if (!path) {
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prom_printf("No stdout-path in root node.\n");
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prom_halt();
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}
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strcpy(of_console_path, path);
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}
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break;
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}
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of_console_options = strrchr(of_console_path, ':');
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if (of_console_options) {
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of_console_options++;
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if (*of_console_options == '\0')
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of_console_options = NULL;
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}
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prom_printf(msg, of_console_path);
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printk(msg, of_console_path);
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}
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void __init prom_build_devicetree(void)
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{
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struct device_node **nextp;
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allnodes = create_node(prom_root_node);
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allnodes->path_component_name = "";
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allnodes->full_name = "/";
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nextp = &allnodes->allnext;
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allnodes->child = build_tree(allnodes,
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prom_getchild(allnodes->node),
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&nextp);
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of_console_init();
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printk("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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