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