1 // SPDX-License-Identifier: GPL-2.0-or-later
3  * Read flash partition table from command line
5  * Copyright © 2002      SYSGO Real-Time Solutions GmbH
6  * Copyright © 2002-2010 David Woodhouse <dwmw2@infradead.org>
11  * <mtddef>  := <mtd-id>:<partdef>[,<partdef>]
12  * <partdef> := <size>[@<offset>][<name>][ro][lk][slc]
13  * <mtd-id>  := unique name used in mapping driver/device (mtd->name)
14  * <size>    := standard linux memsize OR "-" to denote all remaining space
17  * <offset>  := standard linux memsize
23  * <size> and <offset> can be specified such that the parts are out of order
32  * edb7312-nor:-
34  * 1 NOR Flash with 2 partitions, 1 NAND with one
35  * edb7312-nor:256k(ARMboot)ro,-(root);edb7312-nand:-(home)
43 #include <linux/mtd/partitions.h>
49 #define dbg(x) do { printk("DEBUG-CMDLINE-PART: "); printk x; } while(0)
67 static struct cmdline_mtd_partition *partitions;  variable
90 	unsigned long long size, offset = OFFSET_CONTINUOUS;  in newpart()  local
98 	if (*s == '-') {  in newpart()
106 			return ERR_PTR(-EINVAL);  in newpart()
115 	/* check for offset */  in newpart()
118 		offset = memparse(s, &s);  in newpart()
132 			return ERR_PTR(-EINVAL);  in newpart()
134 		name_len = p - name;  in newpart()
162 	/* test if more partitions are following */  in newpart()
165 			pr_err("no partitions allowed after a fill-up partition\n");  in newpart()
166 			return ERR_PTR(-EINVAL);  in newpart()
168 		/* more partitions follow, parse them */  in newpart()
183 			return ERR_PTR(-ENOMEM);  in newpart()
188 	 * enter this partition (offset will be calculated later if it is  in newpart()
192 	parts[this_part].offset = offset;  in newpart()
202 	dbg(("partition %d: name <%s>, offset %llx, size %llx, mask flags %x\n",  in newpart()
203 	     this_part, parts[this_part].name, parts[this_part].offset,  in newpart()
213 	/* return partition table */  in newpart()
240 		 * make sure that part-names with ":" will not be handled as  in mtdpart_setup_real()
241 		 * part of the mtd-id with an ":"  in mtdpart_setup_real()
250 		 * fetch <mtd-id>. We use strrchr to ignore all ':' that could  in mtdpart_setup_real()
252 		 * as an <mtd-id>/<part-definition> separator.  in mtdpart_setup_real()
265 			pr_err("no mtd-id\n");  in mtdpart_setup_real()
266 			return -EINVAL;  in mtdpart_setup_real()
268 		mtd_id_len = p - mtd_id;  in mtdpart_setup_real()
274 		 * struct cmdline_mtd_partition and the mtd-id string.  in mtdpart_setup_real()
282 				sizeof(void*)-1 /*alignment*/);  in mtdpart_setup_real()
298 		this_mtd->parts = parts;  in mtdpart_setup_real()
299 		this_mtd->num_parts = num_parts;  in mtdpart_setup_real()
300 		this_mtd->mtd_id = (char*)(this_mtd + 1);  in mtdpart_setup_real()
301 		strlcpy(this_mtd->mtd_id, mtd_id, mtd_id_len + 1);  in mtdpart_setup_real()
304 		this_mtd->next = partitions;  in mtdpart_setup_real()
305 		partitions = this_mtd;  in mtdpart_setup_real()
308 		     this_mtd->mtd_id, this_mtd->num_parts));  in mtdpart_setup_real()
311 		/* EOS - we're done */  in mtdpart_setup_real()
318 			return -EINVAL;  in mtdpart_setup_real()
330  * information. It returns partitions for the requested mtd device, or
337 	unsigned long long offset;  in parse_cmdline_partitions()  local
340 	const char *mtd_id = master->name;  in parse_cmdline_partitions()
350 	 * Search for the partition definition matching master->name.  in parse_cmdline_partitions()
351 	 * If master->name is not set, stop at first partition definition.  in parse_cmdline_partitions()
353 	for (part = partitions; part; part = part->next) {  in parse_cmdline_partitions()
354 		if ((!mtd_id) || (!strcmp(part->mtd_id, mtd_id)))  in parse_cmdline_partitions()
361 	for (i = 0, offset = 0; i < part->num_parts; i++) {  in parse_cmdline_partitions()
362 		if (part->parts[i].offset == OFFSET_CONTINUOUS)  in parse_cmdline_partitions()
363 			part->parts[i].offset = offset;  in parse_cmdline_partitions()
365 			offset = part->parts[i].offset;  in parse_cmdline_partitions()
367 		if (part->parts[i].size == SIZE_REMAINING)  in parse_cmdline_partitions()
368 			part->parts[i].size = master->size - offset;  in parse_cmdline_partitions()
370 		if (offset + part->parts[i].size > master->size) {  in parse_cmdline_partitions()
372 				part->mtd_id);  in parse_cmdline_partitions()
373 			part->parts[i].size = master->size - offset;  in parse_cmdline_partitions()
375 		offset += part->parts[i].size;  in parse_cmdline_partitions()
377 		if (part->parts[i].size == 0) {  in parse_cmdline_partitions()
379 				part->mtd_id);  in parse_cmdline_partitions()
380 			part->num_parts--;  in parse_cmdline_partitions()
381 			memmove(&part->parts[i], &part->parts[i + 1],  in parse_cmdline_partitions()
382 				sizeof(*part->parts) * (part->num_parts - i));  in parse_cmdline_partitions()
383 			i--;  in parse_cmdline_partitions()
387 	*pparts = kmemdup(part->parts, sizeof(*part->parts) * part->num_parts,  in parse_cmdline_partitions()
390 		return -ENOMEM;  in parse_cmdline_partitions()
392 	return part->num_parts;  in parse_cmdline_partitions()
437 MODULE_DESCRIPTION("Command line configuration of MTD partitions");