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fdt_wip.c revision 1.1.1.2 
      1 /*	$NetBSD: fdt_wip.c,v 1.1.1.2 2017/06/08 15:53:12 skrll Exp $	*/
      2 
      3 /*
      4  * libfdt - Flat Device Tree manipulation
      5  * Copyright (C) 2006 David Gibson, IBM Corporation.
      6  *
      7  * libfdt is dual licensed: you can use it either under the terms of
      8  * the GPL, or the BSD license, at your option.
      9  *
     10  *  a) This library is free software; you can redistribute it and/or
     11  *     modify it under the terms of the GNU General Public License as
     12  *     published by the Free Software Foundation; either version 2 of the
     13  *     License, or (at your option) any later version.
     14  *
     15  *     This library is distributed in the hope that it will be useful,
     16  *     but WITHOUT ANY WARRANTY; without even the implied warranty of
     17  *     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
     18  *     GNU General Public License for more details.
     19  *
     20  *     You should have received a copy of the GNU General Public
     21  *     License along with this library; if not, write to the Free
     22  *     Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston,
     23  *     MA 02110-1301 USA
     24  *
     25  * Alternatively,
     26  *
     27  *  b) Redistribution and use in source and binary forms, with or
     28  *     without modification, are permitted provided that the following
     29  *     conditions are met:
     30  *
     31  *     1. Redistributions of source code must retain the above
     32  *        copyright notice, this list of conditions and the following
     33  *        disclaimer.
     34  *     2. Redistributions in binary form must reproduce the above
     35  *        copyright notice, this list of conditions and the following
     36  *        disclaimer in the documentation and/or other materials
     37  *        provided with the distribution.
     38  *
     39  *     THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
     40  *     CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
     41  *     INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
     42  *     MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
     43  *     DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
     44  *     CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
     45  *     SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
     46  *     NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
     47  *     LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     48  *     HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     49  *     CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
     50  *     OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
     51  *     EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     52  */
     53 #include "libfdt_env.h"
     54 
     55 #include <fdt.h>
     56 #include <libfdt.h>
     57 
     58 #include "libfdt_internal.h"
     59 
     60 int fdt_setprop_inplace_namelen_partial(void *fdt, int nodeoffset,
     61 					const char *name, int namelen,
     62 					uint32_t idx, const void *val,
     63 					int len)
     64 {
     65 	void *propval;
     66 	int proplen;
     67 
     68 	propval = fdt_getprop_namelen_w(fdt, nodeoffset, name, namelen,
     69 					&proplen);
     70 	if (!propval)
     71 		return proplen;
     72 
     73 	if (proplen < (len + idx))
     74 		return -FDT_ERR_NOSPACE;
     75 
     76 	memcpy((char *)propval + idx, val, len);
     77 	return 0;
     78 }
     79 
     80 int fdt_setprop_inplace(void *fdt, int nodeoffset, const char *name,
     81 			const void *val, int len)
     82 {
     83 	const void *propval;
     84 	int proplen;
     85 
     86 	propval = fdt_getprop(fdt, nodeoffset, name, &proplen);
     87 	if (! propval)
     88 		return proplen;
     89 
     90 	if (proplen != len)
     91 		return -FDT_ERR_NOSPACE;
     92 
     93 	return fdt_setprop_inplace_namelen_partial(fdt, nodeoffset, name,
     94 						   strlen(name), 0,
     95 						   val, len);
     96 }
     97 
     98 static void _fdt_nop_region(void *start, int len)
     99 {
    100 	fdt32_t *p;
    101 
    102 	for (p = start; (char *)p < ((char *)start + len); p++)
    103 		*p = cpu_to_fdt32(FDT_NOP);
    104 }
    105 
    106 int fdt_nop_property(void *fdt, int nodeoffset, const char *name)
    107 {
    108 	struct fdt_property *prop;
    109 	int len;
    110 
    111 	prop = fdt_get_property_w(fdt, nodeoffset, name, &len);
    112 	if (! prop)
    113 		return len;
    114 
    115 	_fdt_nop_region(prop, len + sizeof(*prop));
    116 
    117 	return 0;
    118 }
    119 
    120 int _fdt_node_end_offset(void *fdt, int offset)
    121 {
    122 	int depth = 0;
    123 
    124 	while ((offset >= 0) && (depth >= 0))
    125 		offset = fdt_next_node(fdt, offset, &depth);
    126 
    127 	return offset;
    128 }
    129 
    130 int fdt_nop_node(void *fdt, int nodeoffset)
    131 {
    132 	int endoffset;
    133 
    134 	endoffset = _fdt_node_end_offset(fdt, nodeoffset);
    135 	if (endoffset < 0)
    136 		return endoffset;
    137 
    138 	_fdt_nop_region(fdt_offset_ptr_w(fdt, nodeoffset, 0),
    139 			endoffset - nodeoffset);
    140 	return 0;
    141 }
    142