Signed-off-by: Wadim Egorov <w.egorov@phytec.de> Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
324 lines
6.7 KiB
C
324 lines
6.7 KiB
C
/*
|
|
* of_property.c - device tree property handling support
|
|
*
|
|
* Copyright (c) 2013 Sascha Hauer <s.hauer@pengutronix.de>, Pengutronix
|
|
*
|
|
* See file CREDITS for list of people who contributed to this
|
|
* project.
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License version 2
|
|
* as published by the Free Software Foundation.
|
|
*
|
|
* This program is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*
|
|
*/
|
|
|
|
#include <common.h>
|
|
#include <environment.h>
|
|
#include <fdt.h>
|
|
#include <of.h>
|
|
#include <command.h>
|
|
#include <fs.h>
|
|
#include <malloc.h>
|
|
#include <complete.h>
|
|
#include <linux/ctype.h>
|
|
#include <asm/byteorder.h>
|
|
#include <errno.h>
|
|
#include <getopt.h>
|
|
#include <init.h>
|
|
|
|
static int of_parse_prop_cells(char * const *newval, int count, char *data, int *len)
|
|
{
|
|
char *cp;
|
|
unsigned long tmp; /* holds converted values */
|
|
int stridx = 0;
|
|
char *newp = newval[0];
|
|
|
|
newp++;
|
|
|
|
while (1) {
|
|
if (*newp == '>')
|
|
return 0;
|
|
|
|
if (*newp == '\0') {
|
|
newp = newval[++stridx];
|
|
|
|
if (stridx == count) {
|
|
printf("missing '>'\n");
|
|
return -EINVAL;
|
|
}
|
|
|
|
continue;
|
|
}
|
|
|
|
cp = newp;
|
|
|
|
if (isdigit(*cp)) {
|
|
tmp = simple_strtoul(cp, &newp, 0);
|
|
} else {
|
|
struct device_node *n;
|
|
char *str;
|
|
int len = 0;
|
|
|
|
str = cp;
|
|
while (*str && *str != '>' && *str != ' ') {
|
|
str++;
|
|
len++;
|
|
}
|
|
|
|
str = xzalloc(len + 1);
|
|
strncpy(str, cp, len);
|
|
|
|
n = of_find_node_by_path_or_alias(NULL, str);
|
|
if (!n)
|
|
printf("Cannot find node '%s'\n", str);
|
|
|
|
free(str);
|
|
|
|
if (!n)
|
|
return -EINVAL;
|
|
|
|
tmp = of_node_create_phandle(n);
|
|
newp += len;
|
|
}
|
|
|
|
*(__be32 *)data = __cpu_to_be32(tmp);
|
|
data += 4;
|
|
*len += 4;
|
|
|
|
/* If the ptr didn't advance, something went wrong */
|
|
if ((newp - cp) <= 0) {
|
|
printf("cannot convert \"%s\"\n", cp);
|
|
return -EINVAL;
|
|
}
|
|
|
|
while (*newp == ' ')
|
|
newp++;
|
|
}
|
|
}
|
|
|
|
static int of_parse_prop_stream(char * const *newval, int count, char *data, int *len)
|
|
{
|
|
char *cp;
|
|
unsigned long tmp; /* holds converted values */
|
|
int stridx = 0;
|
|
char *newp = newval[0];
|
|
|
|
newp++;
|
|
|
|
while (1) {
|
|
if (*newp == ']')
|
|
return 0;
|
|
|
|
while (*newp == ' ')
|
|
newp++;
|
|
|
|
if (*newp == '\0') {
|
|
newp = newval[++stridx];
|
|
|
|
if (stridx == count) {
|
|
printf("missing ']'\n");
|
|
return -EINVAL;
|
|
}
|
|
|
|
continue;
|
|
}
|
|
|
|
cp = newp;
|
|
tmp = simple_strtoul(newp, &newp, 16);
|
|
*data++ = tmp & 0xff;
|
|
*len = *len + 1;
|
|
|
|
/* If the ptr didn't advance, something went wrong */
|
|
if ((newp - cp) <= 0) {
|
|
printf("cannot convert \"%s\"\n", cp);
|
|
return -EINVAL;
|
|
}
|
|
}
|
|
}
|
|
|
|
static int of_parse_prop_string(char * const *newval, int count, char *data, int *len)
|
|
{
|
|
int stridx = 0;
|
|
char *newp = newval[0];
|
|
|
|
/*
|
|
* Assume it is one or more strings. Copy it into our
|
|
* data area for convenience (including the
|
|
* terminating '\0's).
|
|
*/
|
|
while (stridx < count) {
|
|
size_t length = strlen(newp) + 1;
|
|
|
|
strcpy(data, newp);
|
|
data += length;
|
|
*len += length;
|
|
newp = newval[++stridx];
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Parse the user's input, partially heuristic. Valid formats:
|
|
* <0x00112233 4 05> - an array of cells. Numbers follow standard
|
|
* C conventions.
|
|
* [00 11 22 .. nn] - byte stream
|
|
* "string" - If the the value doesn't start with "<" or "[", it is
|
|
* treated as a string. Note that the quotes are
|
|
* stripped by the parser before we get the string.
|
|
* newval: An array of strings containing the new property as specified
|
|
* on the command line
|
|
* count: The number of strings in the array
|
|
* data: A bytestream to be placed in the property
|
|
* len: The length of the resulting bytestream
|
|
*/
|
|
static int of_parse_prop(char * const *newval, int count, char *data, int *len)
|
|
{
|
|
char *newp; /* temporary newval char pointer */
|
|
|
|
*len = 0;
|
|
|
|
if (!count)
|
|
return 0;
|
|
|
|
newp = newval[0];
|
|
|
|
switch (*newp) {
|
|
case '<':
|
|
return of_parse_prop_cells(newval, count, data, len);
|
|
case '[':
|
|
return of_parse_prop_stream(newval, count, data, len);
|
|
default:
|
|
return of_parse_prop_string(newval, count, data, len);
|
|
}
|
|
}
|
|
|
|
static int do_of_property(int argc, char *argv[])
|
|
{
|
|
int opt;
|
|
int delete = 0;
|
|
int set = 0;
|
|
int ret;
|
|
char *path = NULL, *propname = NULL;
|
|
struct device_node *node = NULL;
|
|
struct property *pp = NULL;
|
|
|
|
while ((opt = getopt(argc, argv, "ds")) > 0) {
|
|
switch (opt) {
|
|
case 'd':
|
|
delete = 1;
|
|
break;
|
|
case 's':
|
|
set = 1;
|
|
break;
|
|
default:
|
|
return COMMAND_ERROR_USAGE;
|
|
}
|
|
}
|
|
|
|
if (optind == argc)
|
|
return COMMAND_ERROR_USAGE;
|
|
|
|
if (optind < argc) {
|
|
path = argv[optind];
|
|
node = of_find_node_by_path_or_alias(NULL, path);
|
|
if (!node) {
|
|
printf("Cannot find nodepath %s\n", path);
|
|
return -ENOENT;
|
|
}
|
|
}
|
|
|
|
if (optind + 1 < argc) {
|
|
propname = argv[optind + 1];
|
|
|
|
pp = of_find_property(node, propname, NULL);
|
|
if (!set && !pp) {
|
|
printf("Cannot find property %s\n", propname);
|
|
return -ENOENT;
|
|
}
|
|
}
|
|
|
|
debug("path: %s propname: %s\n", path, propname);
|
|
|
|
if (delete) {
|
|
if (!node || !pp)
|
|
return COMMAND_ERROR_USAGE;
|
|
|
|
of_delete_property(pp);
|
|
|
|
return 0;
|
|
}
|
|
|
|
if (set) {
|
|
int num_args = argc - optind - 2;
|
|
int len;
|
|
void *data;
|
|
|
|
if (!node)
|
|
return COMMAND_ERROR_USAGE;
|
|
|
|
/*
|
|
* standard console buffer size. The result won't be bigger than the
|
|
* string input.
|
|
*/
|
|
data = malloc(1024);
|
|
if (!data)
|
|
return -ENOMEM;
|
|
|
|
ret = of_parse_prop(&argv[optind + 2], num_args, data, &len);
|
|
if (ret) {
|
|
free(data);
|
|
return ret;
|
|
}
|
|
|
|
if (pp) {
|
|
free(pp->value);
|
|
|
|
/* limit property data to the actual size */
|
|
if (len) {
|
|
pp->value = xrealloc(data, len);
|
|
} else {
|
|
pp->value = NULL;
|
|
free(data);
|
|
}
|
|
|
|
pp->length = len;
|
|
} else {
|
|
pp = of_new_property(node, propname, data, len);
|
|
if (!pp) {
|
|
printf("Cannot create property %s\n", propname);
|
|
free(data);
|
|
return 1;
|
|
}
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
BAREBOX_CMD_HELP_START(of_property)
|
|
BAREBOX_CMD_HELP_TEXT("Options:")
|
|
BAREBOX_CMD_HELP_OPT ("-s", "set property to value")
|
|
BAREBOX_CMD_HELP_OPT ("-d", "delete property")
|
|
BAREBOX_CMD_HELP_TEXT("")
|
|
BAREBOX_CMD_HELP_TEXT("Valid formats for values:")
|
|
BAREBOX_CMD_HELP_TEXT("<0x00112233 4 05> - an array of cells. cells not beginning with a digit are")
|
|
BAREBOX_CMD_HELP_TEXT(" interpreted as node paths and converted to phandles")
|
|
BAREBOX_CMD_HELP_TEXT("[00 11 22 .. nn] - byte stream")
|
|
BAREBOX_CMD_HELP_TEXT("If the value does not start with '<' or '[' it is interpreted as string")
|
|
BAREBOX_CMD_HELP_END
|
|
|
|
BAREBOX_CMD_START(of_property)
|
|
.cmd = do_of_property,
|
|
BAREBOX_CMD_DESC("handle device tree properties")
|
|
BAREBOX_CMD_OPTS("[-sd] NODE [PROPERTY] [VALUES]")
|
|
BAREBOX_CMD_GROUP(CMD_GRP_MISC)
|
|
BAREBOX_CMD_COMPLETE(devicetree_complete)
|
|
BAREBOX_CMD_HELP(cmd_of_property_help)
|
|
BAREBOX_CMD_END
|