1 // SPDX-License-Identifier: GPL-2.0-or-later
3  * Parse RedBoot-style Flash Image System (FIS) tables and
7  * Copyright © 2001-2010 David Woodhouse <dwmw2@infradead.org>
26 	unsigned char _pad[256 - (16 + 7 * sizeof(u32))];
36 static int directory = CONFIG_MTD_REDBOOT_DIRECTORY_BLOCK;  variable
37 module_param(directory, int, 0);
60 	ret = of_property_read_u32(npart, "fis-index-block", &dirblock);  in parse_redboot_of()
66 	 * directory block pointer.  in parse_redboot_of()
68 	directory = dirblock;  in parse_redboot_of()
93 	if (directory < 0) {  in parse_redboot_partitions()
94 		offset = master->size + directory * master->erasesize;  in parse_redboot_partitions()
98 				pr_notice("Failed to find a non-bad block to check for RedBoot partition table\n");  in parse_redboot_partitions()
99 				return -EIO;  in parse_redboot_partitions()
101 			offset -= master->erasesize;  in parse_redboot_partitions()
104 		offset = directory * master->erasesize;  in parse_redboot_partitions()
106 			offset += master->erasesize;  in parse_redboot_partitions()
107 			if (offset == master->size)  in parse_redboot_partitions()
111 	buf = vmalloc(master->erasesize);  in parse_redboot_partitions()
114 		return -ENOMEM;  in parse_redboot_partitions()
117 		  master->name, offset);  in parse_redboot_partitions()
119 	ret = mtd_read(master, offset, master->erasesize, &retlen,  in parse_redboot_partitions()
125 	if (retlen != master->erasesize) {  in parse_redboot_partitions()
126 		ret = -EIO;  in parse_redboot_partitions()
130 	numslots = (master->erasesize / sizeof(struct fis_image_desc));  in parse_redboot_partitions()
132 		if (!memcmp(buf[i].name, "FIS directory", 14)) {  in parse_redboot_partitions()
133 			/* This is apparently the FIS directory entry for the  in parse_redboot_partitions()
134 			 * FIS directory itself.  The FIS directory size is  in parse_redboot_partitions()
137 			 * a byte swapped FIS directory - swap all the entries!  in parse_redboot_partitions()
142 			/* RedBoot can combine the FIS directory and  in parse_redboot_partitions()
144 			   we assume wrong-endian if either the swapped  in parse_redboot_partitions()
148 			if (swab32(buf[i].size) == master->erasesize ||  in parse_redboot_partitions()
149 			    (buf[i].size > master->erasesize  in parse_redboot_partitions()
150 			     && swab32(buf[i].size) < master->erasesize)) {  in parse_redboot_partitions()
152 				/* Update numslots based on actual FIS directory size */  in parse_redboot_partitions()
177 			} else if (buf[i].size < master->erasesize) {  in parse_redboot_partitions()
178 				/* Update numslots based on actual FIS directory size */  in parse_redboot_partitions()
187 			  master->name);  in parse_redboot_partitions()
208 			ret = -ENOMEM;  in parse_redboot_partitions()
211 		new_fl->img = &buf[i];  in parse_redboot_partitions()
212 		if (data && data->origin)  in parse_redboot_partitions()
213 			buf[i].flash_base -= data->origin;  in parse_redboot_partitions()
215 			buf[i].flash_base &= master->size - 1;  in parse_redboot_partitions()
221 		while (*prev && (*prev)->img->flash_base < new_fl->img->flash_base)  in parse_redboot_partitions()
222 			prev = &(*prev)->next;  in parse_redboot_partitions()
223 		new_fl->next = *prev;  in parse_redboot_partitions()
229 	if (fl->img->flash_base) {  in parse_redboot_partitions()
234 	for (tmp_fl = fl; tmp_fl->next; tmp_fl = tmp_fl->next) {  in parse_redboot_partitions()
235 …if (tmp_fl->img->flash_base + tmp_fl->img->size + master->erasesize <= tmp_fl->next->img->flash_ba…  in parse_redboot_partitions()
244 		ret = -ENOMEM;  in parse_redboot_partitions()
258 	if (fl->img->flash_base) {  in parse_redboot_partitions()
260 		parts[0].size = fl->img->flash_base;  in parse_redboot_partitions()
266 		parts[i].size = fl->img->size;  in parse_redboot_partitions()
267 		parts[i].offset = fl->img->flash_base;  in parse_redboot_partitions()
270 		strcpy(names, fl->img->name);  in parse_redboot_partitions()
274 		    !memcmp(names, "FIS directory", 14)) {  in parse_redboot_partitions()
281 …if (fl->next && fl->img->flash_base + fl->img->size + master->erasesize <= fl->next->img->flash_ba…  in parse_redboot_partitions()
283 			parts[i].offset = parts[i - 1].size + parts[i - 1].offset;  in parse_redboot_partitions()
284 			parts[i].size = fl->next->img->flash_base - parts[i].offset;  in parse_redboot_partitions()
289 		fl = fl->next;  in parse_redboot_partitions()
298 		fl = fl->next;  in parse_redboot_partitions()
306 	{ .compatible = "redboot-fis" },