EmbeddedPkg/Library/FdtLib/fdt_wip.c

   1 /*
   2  * libfdt - Flat Device Tree manipulation
   3  * Copyright (C) 2006 David Gibson, IBM Corporation.
   4  *
   5  * libfdt is dual licensed: you can use it either under the terms of
   6  * the GPL, or the BSD license, at your option.
   7  *
   8  *  a) This library is free software; you can redistribute it and/or
   9  *     modify it under the terms of the GNU General Public License as
  10  *     published by the Free Software Foundation; either version 2 of the
  11  *     License, or (at your option) any later version.
  12  *
  13  *     This library is distributed in the hope that it will be useful,
  14  *     but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  *     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  *     GNU General Public License for more details.
  17  *
  18  *     You should have received a copy of the GNU General Public
  19  *     License along with this library; if not, write to the Free
  20  *     Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston,
  21  *     MA 02110-1301 USA
  22  *
  23  * Alternatively,
  24  *
  25  *  b) Redistribution and use in source and binary forms, with or
  26  *     without modification, are permitted provided that the following
  27  *     conditions are met:
  28  *
  29  *     1. Redistributions of source code must retain the above
  30  *        copyright notice, this list of conditions and the following
  31  *        disclaimer.
  32  *     2. Redistributions in binary form must reproduce the above
  33  *        copyright notice, this list of conditions and the following
  34  *        disclaimer in the documentation and/or other materials
  35  *        provided with the distribution.
  36  *
  37  *     THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
  38  *     CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
  39  *     INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
  40  *     MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  41  *     DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
  42  *     CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  43  *     SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  44  *     NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  45  *     LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  46  *     HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  47  *     CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
  48  *     OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
  49  *     EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  50  */
  51 #include "libfdt_env.h"
  52
  53 #include <fdt.h>
  54 #include <libfdt.h>
  55
  56 #include "libfdt_internal.h"
  57
  58 int fdt_setprop_inplace_namelen_partial(void *fdt, int nodeoffset,
  59                                         const char *name, int namelen,
  60                                         uint32_t idx, const void *val,
  61                                         int len)
  62 {
  63         void *propval;
  64         int proplen;
  65
  66         propval = fdt_getprop_namelen_w(fdt, nodeoffset, name, namelen,
  67                                         &proplen);
  68         if (!propval)
  69                 return proplen;
  70
  71         if (proplen < (len + idx))
  72                 return -FDT_ERR_NOSPACE;
  73
  74         memcpy((char *)propval + idx, val, len);
  75         return 0;
  76 }
  77
  78 int fdt_setprop_inplace(void *fdt, int nodeoffset, const char *name,
  79                         const void *val, int len)
  80 {
  81         const void *propval;
  82         int proplen;
  83
  84         propval = fdt_getprop(fdt, nodeoffset, name, &proplen);
  85         if (!propval)
  86                 return proplen;
  87
  88         if (proplen != len)
  89                 return -FDT_ERR_NOSPACE;
  90
  91         return fdt_setprop_inplace_namelen_partial(fdt, nodeoffset, name,
  92                                                    strlen(name), 0,
  93                                                    val, len);
  94 }
  95
  96 static void _fdt_nop_region(void *start, int len)
  97 {
  98         fdt32_t *p;
  99
 100         for (p = start; (char *)p < ((char *)start + len); p++)
 101                 *p = cpu_to_fdt32(FDT_NOP);
 102 }
 103
 104 int fdt_nop_property(void *fdt, int nodeoffset, const char *name)
 105 {
 106         struct fdt_property *prop;
 107         int len;
 108
 109         prop = fdt_get_property_w(fdt, nodeoffset, name, &len);
 110         if (!prop)
 111                 return len;
 112
 113         _fdt_nop_region(prop, len + sizeof(*prop));
 114
 115         return 0;
 116 }
 117
 118 int _fdt_node_end_offset(void *fdt, int offset)
 119 {
 120         int depth = 0;
 121
 122         while ((offset >= 0) && (depth >= 0))
 123                 offset = fdt_next_node(fdt, offset, &depth);
 124
 125         return offset;
 126 }
 127
 128 int fdt_nop_node(void *fdt, int nodeoffset)
 129 {
 130         int endoffset;
 131
 132         endoffset = _fdt_node_end_offset(fdt, nodeoffset);
 133         if (endoffset < 0)
 134                 return endoffset;
 135
 136         _fdt_nop_region(fdt_offset_ptr_w(fdt, nodeoffset, 0),
 137                         endoffset - nodeoffset);
 138         return 0;
 139 }