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/export.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
  27 #include "prom.h"
  28
  29 struct device_node *of_console_device;
  30 EXPORT_SYMBOL(of_console_device);
  31
  32 char *of_console_path;
  33 EXPORT_SYMBOL(of_console_path);
  34
  35 char *of_console_options;
  36 EXPORT_SYMBOL(of_console_options);
  37
  38 int of_getintprop_default(struct device_node *np, const char *name, int def)
  39 {
  40         struct property *prop;
  41         int len;
  42
  43         prop = of_find_property(np, name, &len);
  44         if (!prop || len != 4)
  45                 return def;
  46
  47         return *(int *) prop->value;
  48 }
  49 EXPORT_SYMBOL(of_getintprop_default);
  50
  51 DEFINE_MUTEX(of_set_property_mutex);
  52 EXPORT_SYMBOL(of_set_property_mutex);
  53
  54 int of_set_property(struct device_node *dp, const char *name, void *val, int len)
  55 {
  56         struct property **prevp;
  57         void *new_val;
  58         int err;
  59
  60         new_val = kmemdup(val, len, GFP_KERNEL);
  61         if (!new_val)
  62                 return -ENOMEM;
  63
  64         err = -ENODEV;
  65
  66         mutex_lock(&of_set_property_mutex);
  67         write_lock(&devtree_lock);
  68         prevp = &dp->properties;
  69         while (*prevp) {
  70                 struct property *prop = *prevp;
  71
  72                 if (!strcasecmp(prop->name, name)) {
  73                         void *old_val = prop->value;
  74                         int ret;
  75
  76                         ret = prom_setprop(dp->phandle, name, val, len);
  77
  78                         err = -EINVAL;
  79                         if (ret >= 0) {
  80                                 prop->value = new_val;
  81                                 prop->length = len;
  82
  83                                 if (OF_IS_DYNAMIC(prop))
  84                                         kfree(old_val);
  85
  86                                 OF_MARK_DYNAMIC(prop);
  87
  88                                 err = 0;
  89                         }
  90                         break;
  91                 }
  92                 prevp = &(*prevp)->next;
  93         }
  94         write_unlock(&devtree_lock);
  95         mutex_unlock(&of_set_property_mutex);
  96
  97         /* XXX Upate procfs if necessary... */
  98
  99         return err;
 100 }
 101 EXPORT_SYMBOL(of_set_property);
 102
 103 int of_find_in_proplist(const char *list, const char *match, int len)
 104 {
 105         while (len > 0) {
 106                 int l;
 107
 108                 if (!strcmp(list, match))
 109                         return 1;
 110                 l = strlen(list) + 1;
 111                 list += l;
 112                 len -= l;
 113         }
 114         return 0;
 115 }
 116 EXPORT_SYMBOL(of_find_in_proplist);
 117
 118 /*
 119  * SPARC32 and SPARC64's prom_nextprop() do things differently
 120  * here, despite sharing the same interface.  SPARC32 doesn't fill in 'buf',
 121  * returning NULL on an error.  SPARC64 fills in 'buf', but sets it to an
 122  * empty string upon error.
 123  */
 124 static int __init handle_nextprop_quirks(char *buf, const char *name)
 125 {
 126         if (!name || strlen(name) == 0)
 127                 return -1;
 128
 129 #ifdef CONFIG_SPARC32
 130         strcpy(buf, name);
 131 #endif
 132         return 0;
 133 }
 134
 135 static int __init prom_common_nextprop(phandle node, char *prev, char *buf)
 136 {
 137         const char *name;
 138
 139         buf[0] = '\0';
 140         name = prom_nextprop(node, prev, buf);
 141         return handle_nextprop_quirks(buf, name);
 142 }
 143
 144 unsigned int prom_early_allocated __initdata;
 145
 146 static struct of_pdt_ops prom_sparc_ops __initdata = {
 147         .nextprop = prom_common_nextprop,
 148         .getproplen = prom_getproplen,
 149         .getproperty = prom_getproperty,
 150         .getchild = prom_getchild,
 151         .getsibling = prom_getsibling,
 152 };
 153
 154 void __init prom_build_devicetree(void)
 155 {
 156         of_pdt_build_devicetree(prom_root_node, &prom_sparc_ops);
 157         of_console_init();
 158
 159         pr_info("PROM: Built device tree with %u bytes of memory.\n",
 160                         prom_early_allocated);
 161 }