projects / mirror_ubuntu-bionic-kernel.git / blame
| Commit | Line | Data |
|---|---|---|
| 9a310d21 SW |
1 | /* |
| 2 | * Flash partitions described by the OF (or flattened) device tree | |
| 3 | * | |
| a1452a37 | 4 | * Copyright © 2006 MontaVista Software Inc. |
| 9a310d21 SW |
5 | * Author: Vitaly Wool <vwool@ru.mvista.com> |
| 6 | * | |
| 7 | * Revised to handle newer style flash binding by: | |
| a1452a37 | 8 | * Copyright © 2007 David Gibson, IBM Corporation. |
| 9a310d21 SW |
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> | |
| 5a0e3ad6 | 20 | #include <linux/slab.h> |
| 9a310d21 SW |
21 | #include <linux/mtd/partitions.h> |
| 22 | ||
| d26c87d6 DES |
23 | static int parse_ofpart_partitions(struct mtd_info *master, |
| 24 | struct mtd_partition **pparts, | |
| 25 | struct mtd_part_parser_data *data) | |
| 26 | { | |
| 27 | if (!data || !data->of_node) | |
| 28 | return 0; | |
| 29 | ||
| 30 | return of_mtd_parse_partitions(NULL, data->of_node, pparts); | |
| 31 | } | |
| 32 | ||
| 33 | int of_mtd_parse_partitions(struct device *dev, | |
| 9a310d21 SW |
34 | struct device_node *node, |
| 35 | struct mtd_partition **pparts) | |
| 36 | { | |
| 37 | const char *partname; | |
| 38 | struct device_node *pp; | |
| 39 | int nr_parts, i; | |
| 40 | ||
| 41 | /* First count the subnodes */ | |
| 42 | pp = NULL; | |
| 43 | nr_parts = 0; | |
| 44 | while ((pp = of_get_next_child(node, pp))) | |
| 45 | nr_parts++; | |
| 46 | ||
| 47 | if (nr_parts == 0) | |
| 48 | return 0; | |
| 49 | ||
| 50 | *pparts = kzalloc(nr_parts * sizeof(**pparts), GFP_KERNEL); | |
| 51 | if (!*pparts) | |
| 52 | return -ENOMEM; | |
| 53 | ||
| 54 | pp = NULL; | |
| 55 | i = 0; | |
| 56 | while ((pp = of_get_next_child(node, pp))) { | |
| 766f271a | 57 | const __be32 *reg; |
| 9a310d21 SW |
58 | int len; |
| 59 | ||
| ebd5a74d BK |
60 | reg = of_get_property(pp, "reg", &len); |
| 61 | if (!reg) { | |
| 4b08e149 BK |
62 | nr_parts--; |
| 63 | continue; | |
| 64 | } | |
| 65 | ||
| 766f271a IM |
66 | (*pparts)[i].offset = be32_to_cpu(reg[0]); |
| 67 | (*pparts)[i].size = be32_to_cpu(reg[1]); | |
| 9a310d21 SW |
68 | |
| 69 | partname = of_get_property(pp, "label", &len); | |
| 70 | if (!partname) | |
| 71 | partname = of_get_property(pp, "name", &len); | |
| 72 | (*pparts)[i].name = (char *)partname; | |
| 73 | ||
| 74 | if (of_get_property(pp, "read-only", &len)) | |
| 75 | (*pparts)[i].mask_flags = MTD_WRITEABLE; | |
| 76 | ||
| 77 | i++; | |
| 78 | } | |
| 79 | ||
| ebd5a74d BK |
80 | if (!i) { |
| 81 | of_node_put(pp); | |
| d26c87d6 | 82 | pr_err("No valid partition found on %s\n", node->full_name); |
| ebd5a74d BK |
83 | kfree(*pparts); |
| 84 | *pparts = NULL; | |
| 85 | return -EINVAL; | |
| 86 | } | |
| 87 | ||
| 9a310d21 SW |
88 | return nr_parts; |
| 89 | } | |
| 90 | EXPORT_SYMBOL(of_mtd_parse_partitions); | |
| 950bcb25 | 91 | |
| d26c87d6 DES |
92 | static struct mtd_part_parser ofpart_parser = { |
| 93 | .owner = THIS_MODULE, | |
| 94 | .parse_fn = parse_ofpart_partitions, | |
| 95 | .name = "ofpart", | |
| 96 | }; | |
| 97 | ||
| 98 | static int __init ofpart_parser_init(void) | |
| 99 | { | |
| 100 | return register_mtd_parser(&ofpart_parser); | |
| 101 | } | |
| 102 | ||
| 103 | module_init(ofpart_parser_init); | |
| 104 | ||
| 950bcb25 | 105 | MODULE_LICENSE("GPL"); |