1 // SPDX-License-Identifier: GPL-2.0-only
25  * Amount of bytes we read when analyzing each block of flash memory.
51 	uint32_t offset[3];  member
55 				 u64 offset, uint32_t mask_flags)  in bcm47xxpart_add_part()  argument
57 	part->name = name;  in bcm47xxpart_add_part()
58 	part->offset = offset;  in bcm47xxpart_add_part()
59 	part->mask_flags = mask_flags;  in bcm47xxpart_add_part()
63  * bcm47xxpart_bootpartition - gets index of TRX partition used by bootloader
94 	uint32_t offset;  in bcm47xxpart_parse()  local
95 	uint32_t blocksize = master->erasesize;  in bcm47xxpart_parse()
102 	 * Some really old flashes (like AT45DB*) had smaller erasesize-s, but  in bcm47xxpart_parse()
112 		return -ENOMEM;  in bcm47xxpart_parse()
117 		return -ENOMEM;  in bcm47xxpart_parse()
120 	/* Parse block by block looking for magics */  in bcm47xxpart_parse()
121 	for (offset = 0; offset <= master->size - blocksize;  in bcm47xxpart_parse()
122 	     offset += blocksize) {  in bcm47xxpart_parse()
124 		if (IS_ENABLED(CONFIG_BCM47XX) && offset >= 0x2000000)  in bcm47xxpart_parse()
132 		/* Read beginning of the block */  in bcm47xxpart_parse()
133 		err = mtd_read(master, offset, BCM47XXPART_BYTES_TO_READ,  in bcm47xxpart_parse()
136 			pr_err("mtd_read error while parsing (offset: 0x%X): %d\n",  in bcm47xxpart_parse()
137 			       offset, err);  in bcm47xxpart_parse()
145 					     offset, MTD_WRITEABLE);  in bcm47xxpart_parse()
155 					     offset, MTD_WRITEABLE);  in bcm47xxpart_parse()
162 					     offset, MTD_WRITEABLE);  in bcm47xxpart_parse()
169 			bcm47xxpart_add_part(&parts[curr_part++], "POT", offset,  in bcm47xxpart_parse()
177 			bcm47xxpart_add_part(&parts[curr_part++], "ML", offset,  in bcm47xxpart_parse()
190 					offset);  in bcm47xxpart_parse()
194 					     offset, 0);  in bcm47xxpart_parse()
200 			 * can't cover e.g. ever-changing rootfs partition.  in bcm47xxpart_parse()
204 			last_subpart = max3(trx->offset[0], trx->offset[1],  in bcm47xxpart_parse()
205 					    trx->offset[2]);  in bcm47xxpart_parse()
206 			trx_size = max(trx->length, last_subpart + blocksize);  in bcm47xxpart_parse()
209 			 * Skip the TRX data. Decrease offset by block size as  in bcm47xxpart_parse()
212 			offset += roundup(trx_size, blocksize) - blocksize;  in bcm47xxpart_parse()
220 					     offset, 0);  in bcm47xxpart_parse()
225 		 * New (ARM?) devices may have NVRAM in some middle block. Last  in bcm47xxpart_parse()
226 		 * block will be checked later, so skip it.  in bcm47xxpart_parse()
228 		if (offset != master->size - blocksize &&  in bcm47xxpart_parse()
231 					     offset, 0);  in bcm47xxpart_parse()
235 		/* Read middle of the block */  in bcm47xxpart_parse()
236 		err = mtd_read(master, offset + (blocksize / 2), 0x4, &bytes_read,  in bcm47xxpart_parse()
239 			pr_err("mtd_read error while parsing (offset: 0x%X): %d\n",  in bcm47xxpart_parse()
240 			       offset + (blocksize / 2), err);  in bcm47xxpart_parse()
247 					     offset, MTD_WRITEABLE);  in bcm47xxpart_parse()
252 	/* Look for NVRAM at the end of the last block. */  in bcm47xxpart_parse()
259 		offset = master->size - possible_nvram_sizes[i];  in bcm47xxpart_parse()
260 		err = mtd_read(master, offset, 0x4, &bytes_read,  in bcm47xxpart_parse()
263 			pr_err("mtd_read error while reading (offset 0x%X): %d\n",  in bcm47xxpart_parse()
264 			       offset, err);  in bcm47xxpart_parse()
271 					     master->size - blocksize, 0);  in bcm47xxpart_parse()
283 		u64 next_part_offset = (i < curr_part - 1) ?  in bcm47xxpart_parse()
284 				       parts[i + 1].offset : master->size;  in bcm47xxpart_parse()
286 		parts[i].size = next_part_offset - parts[i].offset;  in bcm47xxpart_parse()
294 			trx->types = trx_types;  in bcm47xxpart_parse()
296 			trx->name = "failsafe";  in bcm47xxpart_parse()
304 	{ .compatible = "brcm,bcm947xx-cfe-partitions" },