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/*
* of_path.c
*
* 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 <malloc.h>
#include <of.h>
#include <linux/mtd/mtd.h>
struct of_path {
struct cdev *cdev;
struct device_d *dev;
};
struct of_path_type {
const char *name;
int (*parse)(struct of_path *op, const char *str);
};
struct device_d *of_find_device_by_node_path(const char *path)
{
struct device_d *dev;
for_each_device(dev) {
if (!dev->device_node)
continue;
if (!strcmp(path, dev->device_node->full_name))
return dev;
}
return NULL;
}
/**
* of_path_type_partname - find a partition based on physical device and
* partition name
* @op: of_path context
* @name: the partition name to find
*/
static int of_path_type_partname(struct of_path *op, const char *name)
{
if (!op->dev)
return -EINVAL;
op->cdev = device_find_partition(op->dev, name);
if (op->cdev) {
pr_debug("%s: found part '%s'\n", __func__, name);
return 0;
} else {
pr_debug("%s: cannot find part '%s'\n", __func__, name);
return -ENODEV;
}
}
static struct of_path_type of_path_types[] = {
{
.name = "partname",
.parse = of_path_type_partname,
},
};
static int of_path_parse_one(struct of_path *op, const char *str)
{
int i, ret;
char *name, *desc;
pr_debug("parsing: %s\n", str);
name = xstrdup(str);
desc = strchr(name, ':');
if (!desc) {
free(name);
return -EINVAL;
}
*desc = 0;
desc++;
for (i = 0; i < ARRAY_SIZE(of_path_types); i++) {
if (!strcmp(of_path_types[i].name, name)) {
ret = of_path_types[i].parse(op, desc);
goto out;
}
}
ret = -EINVAL;
out:
free(name);
return ret;
}
static int __of_find_path(struct device_node *node, const char *propname, char **outpath, unsigned flags)
{
struct of_path op = {};
const char *str;
bool add_bb = false;
int i, ret;
op.dev = of_find_device_by_node_path(node->full_name);
if (!op.dev) {
op.dev = of_find_device_by_node_path(node->parent->full_name);
if (!op.dev)
return -ENODEV;
}
device_detect(op.dev);
op.cdev = cdev_by_device_node(node);
i = 1;
while (propname) {
ret = of_property_read_string_index(node, propname, i++, &str);
if (ret)
break;
ret = of_path_parse_one(&op, str);
if (ret)
return ret;
}
if (!op.cdev)
return -ENOENT;
if ((flags & OF_FIND_PATH_FLAGS_BB) && op.cdev->mtd &&
mtd_can_have_bb(op.cdev->mtd))
add_bb = true;
*outpath = asprintf("/dev/%s%s", op.cdev->name, add_bb ? ".bb" : "");
return 0;
}
/**
* of_find_path_by_node - translate a node in the devicetree to a
* barebox device path
*
* @node: the node we're interested in
* @outpath: if this function returns 0 outpath will contain the path belonging
* to the input path description. Must be freed with free().
* @flags: use OF_FIND_PATH_FLAGS_BB to return the .bb device if available
*
*/
int of_find_path_by_node(struct device_node *node, char **outpath, unsigned flags)
{
return __of_find_path(node, NULL, outpath, flags);
}
/**
* of_find_path - translate a path description in the devicetree to a barebox
* path
*
* @node: the node containing the property with the path description
* @propname: the property name of the path description
* @outpath: if this function returns 0 outpath will contain the path belonging
* to the input path description. Must be freed with free().
* @flags: use OF_FIND_PATH_FLAGS_BB to return the .bb device if available
*
* paths in the devicetree have the form of a multistring property. The first
* string contains the full path to the physical device containing the path or
* a full path to a partition described by the OF partition binding.
* The remaining strings have the form "<type>:<options>". Currently supported
* for <type> are:
*
* partname:<partname> - find a partition by its partition name. For mtd
* partitions this is the label. For DOS partitions
* this is the number beginning with 0.
*
* examples:
*
* device-path = &mmc0, "partname:0";
* device-path = &norflash, "partname:barebox-environment";
* device-path = &environment_nor;
*/
int of_find_path(struct device_node *node, const char *propname, char **outpath, unsigned flags)
{
struct device_node *rnode;
const char *path;
path = of_get_property(node, propname, NULL);
if (!path)
return -EINVAL;
rnode = of_find_node_by_path(path);
if (!rnode)
return -ENODEV;
return __of_find_path(rnode, propname, outpath, flags);
}
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