arch/sparc/kernel/prom_common.c

   1 /* prom_common.c: OF device tree support common code.
   2  *
   3  * Paul Mackerras       August 1996.
   4  * Copyright (C) 1996-2005 Paul Mackerras.
   5  *
   6  *  Adapted for 64bit PowerPC by Dave Engebretsen and Peter Bergner.
   7  *    {engebret|bergner}@us.ibm.com
   8  *
   9  *  Adapted for sparc by David S. Miller davem@davemloft.net
  10  *
  11  *      This program is free software; you can redistribute it and/or
  12  *      modify it under the terms of the GNU General Public License
  13  *      as published by the Free Software Foundation; either version
  14  *      2 of the License, or (at your option) any later version.
  15  */
  16
  17 #include <linux/kernel.h>
  18 #include <linux/module.h>
  19 #include <linux/errno.h>
  20 #include <linux/mutex.h>
  21 #include <linux/slab.h>
  22 #include <linux/of.h>
  23 #include <linux/of_pdt.h>
  24 #include <asm/prom.h>
  25 #include <asm/oplib.h>
  26 #include <asm/leon.h>
  27
  28 #include "prom.h"
  29
  30 struct device_node *of_console_device;
  31 EXPORT_SYMBOL(of_console_device);
  32
  33 char *of_console_path;
  34 EXPORT_SYMBOL(of_console_path);
  35
  36 char *of_console_options;
  37 EXPORT_SYMBOL(of_console_options);
  38
  39 int of_getintprop_default(struct device_node *np, const char *name, int def)
  40 {
  41         struct property *prop;
  42         int len;
  43
  44         prop = of_find_property(np, name, &len);
  45         if (!prop || len != 4)
  46                 return def;
  47
  48         return *(int *) prop->value;
  49 }
  50 EXPORT_SYMBOL(of_getintprop_default);
  51
  52 DEFINE_MUTEX(of_set_property_mutex);
  53 EXPORT_SYMBOL(of_set_property_mutex);
  54
  55 int of_set_property(struct device_node *dp, const char *name, void *val, int len)
  56 {
  57         struct property **prevp;
  58         void *new_val;
  59         int err;
  60
  61         new_val = kmalloc(len, GFP_KERNEL);
  62         if (!new_val)
  63                 return -ENOMEM;
  64
  65         memcpy(new_val, val, len);
  66
  67         err = -ENODEV;
  68
  69         mutex_lock(&of_set_property_mutex);
  70         write_lock(&devtree_lock);
  71         prevp = &dp->properties;
  72         while (*prevp) {
  73                 struct property *prop = *prevp;
  74
  75                 if (!strcasecmp(prop->name, name)) {
  76                         void *old_val = prop->value;
  77                         int ret;
  78
  79                         ret = prom_setprop(dp->phandle, name, val, len);
  80
  81                         err = -EINVAL;
  82                         if (ret >= 0) {
  83                                 prop->value = new_val;
  84                                 prop->length = len;
  85
  86                                 if (OF_IS_DYNAMIC(prop))
  87                                         kfree(old_val);
  88
  89                                 OF_MARK_DYNAMIC(prop);
  90
  91                                 err = 0;
  92                         }
  93                         break;
  94                 }
  95                 prevp = &(*prevp)->next;
  96         }
  97         write_unlock(&devtree_lock);
  98         mutex_unlock(&of_set_property_mutex);
  99
 100         /* XXX Upate procfs if necessary... */
 101
 102         return err;
 103 }
 104 EXPORT_SYMBOL(of_set_property);
 105
 106 int of_find_in_proplist(const char *list, const char *match, int len)
 107 {
 108         while (len > 0) {
 109                 int l;
 110
 111                 if (!strcmp(list, match))
 112                         return 1;
 113                 l = strlen(list) + 1;
 114                 list += l;
 115                 len -= l;
 116         }
 117         return 0;
 118 }
 119 EXPORT_SYMBOL(of_find_in_proplist);
 120
 121 /*
 122  * SPARC32 and SPARC64's prom_nextprop() do things differently
 123  * here, despite sharing the same interface.  SPARC32 doesn't fill in 'buf',
 124  * returning NULL on an error.  SPARC64 fills in 'buf', but sets it to an
 125  * empty string upon error.
 126  */
 127 static int __init handle_nextprop_quirks(char *buf, const char *name)
 128 {
 129         if (!name || strlen(name) == 0)
 130                 return -1;
 131
 132 #ifdef CONFIG_SPARC32
 133         strcpy(buf, name);
 134 #endif
 135         return 0;
 136 }
 137
 138 static int __init prom_common_nextprop(phandle node, char *prev, char *buf)
 139 {
 140         const char *name;
 141
 142         buf[0] = '\0';
 143         name = prom_nextprop(node, prev, buf);
 144         return handle_nextprop_quirks(buf, name);
 145 }
 146
 147 unsigned int prom_early_allocated __initdata;
 148
 149 static struct of_pdt_ops prom_sparc_ops __initdata = {
 150         .nextprop = prom_common_nextprop,
 151         .getproplen = prom_getproplen,
 152         .getproperty = prom_getproperty,
 153         .getchild = prom_getchild,
 154         .getsibling = prom_getsibling,
 155 };
 156
 157 void __init prom_build_devicetree(void)
 158 {
 159         of_pdt_build_devicetree(prom_root_node, &prom_sparc_ops);
 160         of_console_init();
 161
 162         pr_info("PROM: Built device tree with %u bytes of memory.\n",
 163                         prom_early_allocated);
 164 }