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| 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 | |
| 23 | static int parse_ofpart_partitions(struct mtd_info *master, |
| 24 | struct mtd_partition **pparts, |
| 25 | struct mtd_part_parser_data *data) |
| 26 | { |
| 27 | struct device_node *node; |
| 28 | const char *partname; |
| 29 | struct device_node *pp; |
| 30 | int nr_parts, i; |
| 31 | |
| 32 | |
| 33 | if (!data) |
| 34 | return 0; |
| 35 | |
| 36 | node = data->of_node; |
| 37 | if (!node) |
| 38 | return 0; |
| 39 | |
| 40 | /* First count the subnodes */ |
| 41 | pp = NULL; |
| 42 | nr_parts = 0; |
| 43 | while ((pp = of_get_next_child(node, pp))) |
| 44 | nr_parts++; |
| 45 | |
| 46 | if (nr_parts == 0) |
| 47 | return 0; |
| 48 | |
| 49 | *pparts = kzalloc(nr_parts * sizeof(**pparts), GFP_KERNEL); |
| 50 | if (!*pparts) |
| 51 | return -ENOMEM; |
| 52 | |
| 53 | pp = NULL; |
| 54 | i = 0; |
| 55 | while ((pp = of_get_next_child(node, pp))) { |
| 56 | const __be32 *reg; |
| 57 | int len; |
| 58 | |
| 59 | reg = of_get_property(pp, "reg", &len); |
| 60 | if (!reg) { |
| 61 | nr_parts--; |
| 62 | continue; |
| 63 | } |
| 64 | |
| 65 | (*pparts)[i].offset = be32_to_cpu(reg[0]); |
| 66 | (*pparts)[i].size = be32_to_cpu(reg[1]); |
| 67 | |
| 68 | partname = of_get_property(pp, "label", &len); |
| 69 | if (!partname) |
| 70 | partname = of_get_property(pp, "name", &len); |
| 71 | (*pparts)[i].name = (char *)partname; |
| 72 | |
| 73 | if (of_get_property(pp, "read-only", &len)) |
| 74 | (*pparts)[i].mask_flags = MTD_WRITEABLE; |
| 75 | |
| 76 | i++; |
| 77 | } |
| 78 | |
| 79 | if (!i) { |
| 80 | of_node_put(pp); |
| 81 | pr_err("No valid partition found on %s\n", node->full_name); |
| 82 | kfree(*pparts); |
| 83 | *pparts = NULL; |
| 84 | return -EINVAL; |
| 85 | } |
| 86 | |
| 87 | return nr_parts; |
| 88 | } |
| 89 | |
| 90 | static struct mtd_part_parser ofpart_parser = { |
| 91 | .owner = THIS_MODULE, |
| 92 | .parse_fn = parse_ofpart_partitions, |
| 93 | .name = "ofpart", |
| 94 | }; |
| 95 | |
| 96 | static int parse_ofoldpart_partitions(struct mtd_info *master, |
| 97 | struct mtd_partition **pparts, |
| 98 | struct mtd_part_parser_data *data) |
| 99 | { |
| 100 | struct device_node *dp; |
| 101 | int i, plen, nr_parts; |
| 102 | const struct { |
| 103 | __be32 offset, len; |
| 104 | } *part; |
| 105 | const char *names; |
| 106 | |
| 107 | if (!data) |
| 108 | return 0; |
| 109 | |
| 110 | dp = data->of_node; |
| 111 | if (!dp) |
| 112 | return 0; |
| 113 | |
| 114 | part = of_get_property(dp, "partitions", &plen); |
| 115 | if (!part) |
| 116 | return 0; /* No partitions found */ |
| 117 | |
| 118 | pr_warning("Device tree uses obsolete partition map binding: %s\n", |
| 119 | dp->full_name); |
| 120 | |
| 121 | nr_parts = plen / sizeof(part[0]); |
| 122 | |
| 123 | *pparts = kzalloc(nr_parts * sizeof(*(*pparts)), GFP_KERNEL); |
| 124 | if (!pparts) |
| 125 | return -ENOMEM; |
| 126 | |
| 127 | names = of_get_property(dp, "partition-names", &plen); |
| 128 | |
| 129 | for (i = 0; i < nr_parts; i++) { |
| 130 | (*pparts)[i].offset = be32_to_cpu(part->offset); |
| 131 | (*pparts)[i].size = be32_to_cpu(part->len) & ~1; |
| 132 | /* bit 0 set signifies read only partition */ |
| 133 | if (be32_to_cpu(part->len) & 1) |
| 134 | (*pparts)[i].mask_flags = MTD_WRITEABLE; |
| 135 | |
| 136 | if (names && (plen > 0)) { |
| 137 | int len = strlen(names) + 1; |
| 138 | |
| 139 | (*pparts)[i].name = (char *)names; |
| 140 | plen -= len; |
| 141 | names += len; |
| 142 | } else { |
| 143 | (*pparts)[i].name = "unnamed"; |
| 144 | } |
| 145 | |
| 146 | part++; |
| 147 | } |
| 148 | |
| 149 | return nr_parts; |
| 150 | } |
| 151 | |
| 152 | static struct mtd_part_parser ofoldpart_parser = { |
| 153 | .owner = THIS_MODULE, |
| 154 | .parse_fn = parse_ofoldpart_partitions, |
| 155 | .name = "ofoldpart", |
| 156 | }; |
| 157 | |
| 158 | static int __init ofpart_parser_init(void) |
| 159 | { |
| 160 | int rc; |
| 161 | rc = register_mtd_parser(&ofpart_parser); |
| 162 | if (rc) |
| 163 | goto out; |
| 164 | |
| 165 | rc = register_mtd_parser(&ofoldpart_parser); |
| 166 | if (!rc) |
| 167 | return 0; |
| 168 | |
| 169 | deregister_mtd_parser(&ofoldpart_parser); |
| 170 | out: |
| 171 | return rc; |
| 172 | } |
| 173 | |
| 174 | module_init(ofpart_parser_init); |
| 175 | |
| 176 | MODULE_LICENSE("GPL"); |
| 177 | MODULE_DESCRIPTION("Parser for MTD partitioning information in device tree"); |
| 178 | MODULE_AUTHOR("Vitaly Wool, David Gibson"); |
| 179 | /* |
| 180 | * When MTD core cannot find the requested parser, it tries to load the module |
| 181 | * with the same name. Since we provide the ofoldpart parser, we should have |
| 182 | * the corresponding alias. |
| 183 | */ |
| 184 | MODULE_ALIAS("ofoldpart"); |
| 185 |
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