linux/drivers/mtd/ofpart.c
Ian Munsie 766f271a63 mtd: Fix endianness issues from device tree
This patch adds the appropriate conversions to correct the endianness
issues in the MTD driver whenever it accesses the device tree (which is
always big endian).

Signed-off-by: Ian Munsie <imunsie@au1.ibm.com>
Signed-off-by: Artem Bityutskiy <Artem.Bityutskiy@nokia.com>
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
2010-10-25 00:55:56 +01:00

83 lines
1.9 KiB
C

/*
* Flash partitions described by the OF (or flattened) device tree
*
* Copyright © 2006 MontaVista Software Inc.
* Author: Vitaly Wool <vwool@ru.mvista.com>
*
* Revised to handle newer style flash binding by:
* Copyright © 2007 David Gibson, IBM Corporation.
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the
* Free Software Foundation; either version 2 of the License, or (at your
* option) any later version.
*/
#include <linux/module.h>
#include <linux/init.h>
#include <linux/of.h>
#include <linux/mtd/mtd.h>
#include <linux/slab.h>
#include <linux/mtd/partitions.h>
int __devinit of_mtd_parse_partitions(struct device *dev,
struct device_node *node,
struct mtd_partition **pparts)
{
const char *partname;
struct device_node *pp;
int nr_parts, i;
/* First count the subnodes */
pp = NULL;
nr_parts = 0;
while ((pp = of_get_next_child(node, pp)))
nr_parts++;
if (nr_parts == 0)
return 0;
*pparts = kzalloc(nr_parts * sizeof(**pparts), GFP_KERNEL);
if (!*pparts)
return -ENOMEM;
pp = NULL;
i = 0;
while ((pp = of_get_next_child(node, pp))) {
const __be32 *reg;
int len;
reg = of_get_property(pp, "reg", &len);
if (!reg) {
nr_parts--;
continue;
}
(*pparts)[i].offset = be32_to_cpu(reg[0]);
(*pparts)[i].size = be32_to_cpu(reg[1]);
partname = of_get_property(pp, "label", &len);
if (!partname)
partname = of_get_property(pp, "name", &len);
(*pparts)[i].name = (char *)partname;
if (of_get_property(pp, "read-only", &len))
(*pparts)[i].mask_flags = MTD_WRITEABLE;
i++;
}
if (!i) {
of_node_put(pp);
dev_err(dev, "No valid partition found on %s\n", node->full_name);
kfree(*pparts);
*pparts = NULL;
return -EINVAL;
}
return nr_parts;
}
EXPORT_SYMBOL(of_mtd_parse_partitions);
MODULE_LICENSE("GPL");