1/* 2 * Flash partitions described by the OF (or flattened) device tree 3 * 4 * Copyright �� 2006 MontaVista Software Inc. 5 * Author: Vitaly Wool <vwool@ru.mvista.com> 6 * 7 * Revised to handle newer style flash binding by: 8 * Copyright �� 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/slab.h> 21#include <linux/mtd/partitions.h> 22 23int __devinit of_mtd_parse_partitions(struct device *dev, 24 struct device_node *node, 25 struct mtd_partition **pparts) 26{ 27 const char *partname; 28 struct device_node *pp; 29 int nr_parts, i; 30 31 /* First count the subnodes */ 32 pp = NULL; 33 nr_parts = 0; 34 while ((pp = of_get_next_child(node, pp))) 35 nr_parts++; 36 37 if (nr_parts == 0) 38 return 0; 39 40 *pparts = kzalloc(nr_parts * sizeof(**pparts), GFP_KERNEL); 41 if (!*pparts) 42 return -ENOMEM; 43 44 pp = NULL; 45 i = 0; 46 while ((pp = of_get_next_child(node, pp))) { 47 const u32 *reg; 48 int len; 49 50 reg = of_get_property(pp, "reg", &len); 51 if (!reg) { 52 nr_parts--; 53 continue; 54 } 55 56 (*pparts)[i].offset = reg[0]; 57 (*pparts)[i].size = reg[1]; 58 59 partname = of_get_property(pp, "label", &len); 60 if (!partname) 61 partname = of_get_property(pp, "name", &len); 62 (*pparts)[i].name = (char *)partname; 63 64 if (of_get_property(pp, "read-only", &len)) 65 (*pparts)[i].mask_flags = MTD_WRITEABLE; 66 67 i++; 68 } 69 70 if (!i) { 71 of_node_put(pp); 72 dev_err(dev, "No valid partition found on %s\n", node->full_name); 73 kfree(*pparts); 74 *pparts = NULL; 75 return -EINVAL; 76 } 77 78 return nr_parts; 79} 80EXPORT_SYMBOL(of_mtd_parse_partitions); 81 82MODULE_LICENSE("GPL"); 83