LXR linux/drivers/mtd/ofpart.c

   1/*
   2 * Flash partitions described by the OF (or flattened) device tree
   3 *
   4 * Copyright (C) 2006 MontaVista Software Inc.
   5 * Author: Vitaly Wool <vwool@ru.mvista.com>
   6 *
   7 * Revised to handle newer style flash binding by:
   8 *   Copyright (C) 2007 David Gibson, IBM Corporation.
   9 *
  10 * This program is free software; you can redistribute  it and/or modify it
  11 * under  the terms of  the GNU General  Public License as published by the
  12 * Free Software Foundation;  either version 2 of the  License, or (at your
  13 * option) any later version.
  14 */
  15
  16#include <linux/module.h>
  17#include <linux/init.h>
  18#include <linux/of.h>
  19#include <linux/mtd/mtd.h>
  20#include <linux/mtd/partitions.h>
  21
  22int __devinit of_mtd_parse_partitions(struct device *dev,
  23                                      struct device_node *node,
  24                                      struct mtd_partition **pparts)
  25{
  26        const char *partname;
  27        struct device_node *pp;
  28        int nr_parts, i;
  29
  30        /* First count the subnodes */
  31        pp = NULL;
  32        nr_parts = 0;
  33        while ((pp = of_get_next_child(node, pp)))
  34                nr_parts++;
  35
  36        if (nr_parts == 0)
  37                return 0;
  38
  39        *pparts = kzalloc(nr_parts * sizeof(**pparts), GFP_KERNEL);
  40        if (!*pparts)
  41                return -ENOMEM;
  42
  43        pp = NULL;
  44        i = 0;
  45        while ((pp = of_get_next_child(node, pp))) {
  46                const u32 *reg;
  47                int len;
  48
  49                reg = of_get_property(pp, "reg", &len);
  50                if (!reg) {
  51                        nr_parts--;
  52                        continue;
  53                }
  54
  55                (*pparts)[i].offset = reg[0];
  56                (*pparts)[i].size = reg[1];
  57
  58                partname = of_get_property(pp, "label", &len);
  59                if (!partname)
  60                        partname = of_get_property(pp, "name", &len);
  61                (*pparts)[i].name = (char *)partname;
  62
  63                if (of_get_property(pp, "read-only", &len))
  64                        (*pparts)[i].mask_flags = MTD_WRITEABLE;
  65
  66                i++;
  67        }
  68
  69        if (!i) {
  70                of_node_put(pp);
  71                dev_err(dev, "No valid partition found on %s\n", node->full_name);
  72                kfree(*pparts);
  73                *pparts = NULL;
  74                return -EINVAL;
  75        }
  76
  77        return nr_parts;
  78}
  79EXPORT_SYMBOL(of_mtd_parse_partitions);
  80
  81MODULE_LICENSE("GPL");
  82