1 // SPDX-License-Identifier: GPL-2.0
15 #include <linux/mtd/mtd.h>
16 #include <linux/mtd/onenand.h>
20  * check_short_pattern - [GENERIC] check if a pattern is in the buffer
38 	for (i = 0; i < td->len; i++) {  in check_short_pattern()
39 		if (p[i] != td->pattern[i])  in check_short_pattern()
40 			return -1;  in check_short_pattern()
46  * create_bbt - [GENERIC] Create a bad block table by scanning the device
47  * @mtd:		MTD device structure
50  * @chip:		create the table for a specific chip, -1 read all chips.
56 static int create_bbt(struct mtd_info *mtd, uint8_t *buf, struct nand_bbt_descr *bd, int chip)  in create_bbt()  argument
58 	struct onenand_chip *this = mtd->priv;  in create_bbt()
59 	struct bbm_info *bbm = this->bbm;  in create_bbt()
73 	readlen = bd->len;  in create_bbt()
75 	/* chip == -1 case only */  in create_bbt()
79 	numblocks = this->chipsize >> (bbm->bbt_erase_shift - 1);  in create_bbt()
94 			ret = onenand_bbt_read_oob(mtd,  in create_bbt()
95 				from + j * this->writesize + bd->offs, &ops);  in create_bbt()
99 				return -EIO;  in create_bbt()
102 					       scanlen, this->writesize, bd)) {  in create_bbt()
103 				bbm->bbt[i >> 3] |= 0x03 << (i & 0x6);  in create_bbt()
106 				mtd->ecc_stats.badblocks++;  in create_bbt()
113 			rgn = flexonenand_region(mtd, from);  in create_bbt()
114 			from += mtd->eraseregions[rgn].erasesize;  in create_bbt()
116 			from += (1 << bbm->bbt_erase_shift);  in create_bbt()
124  * onenand_memory_bbt - [GENERIC] create a memory based bad block table
125  * @mtd:		MTD device structure
131 static inline int onenand_memory_bbt (struct mtd_info *mtd, struct nand_bbt_descr *bd)  in onenand_memory_bbt()  argument
133 	struct onenand_chip *this = mtd->priv;  in onenand_memory_bbt()
135 	return create_bbt(mtd, this->page_buf, bd, -1);  in onenand_memory_bbt()
139  * onenand_isbad_bbt - [OneNAND Interface] Check if a block is bad
140  * @mtd:		MTD device structure
144 static int onenand_isbad_bbt(struct mtd_info *mtd, loff_t offs, int allowbbt)  in onenand_isbad_bbt()  argument
146 	struct onenand_chip *this = mtd->priv;  in onenand_isbad_bbt()
147 	struct bbm_info *bbm = this->bbm;  in onenand_isbad_bbt()
153 	res = (bbm->bbt[block >> 3] >> (block & 0x06)) & 0x03;  in onenand_isbad_bbt()
168  * onenand_scan_bbt - [OneNAND Interface] scan, find, read and maybe create bad block table(s)
169  * @mtd:		MTD device structure
181 static int onenand_scan_bbt(struct mtd_info *mtd, struct nand_bbt_descr *bd)  in onenand_scan_bbt()  argument
183 	struct onenand_chip *this = mtd->priv;  in onenand_scan_bbt()
184 	struct bbm_info *bbm = this->bbm;  in onenand_scan_bbt()
187 	len = this->chipsize >> (this->erase_shift + 2);  in onenand_scan_bbt()
189 	bbm->bbt = kzalloc(len, GFP_KERNEL);  in onenand_scan_bbt()
190 	if (!bbm->bbt)  in onenand_scan_bbt()
191 		return -ENOMEM;  in onenand_scan_bbt()
194 	bbm->bbt_erase_shift = this->erase_shift;  in onenand_scan_bbt()
196 	if (!bbm->isbad_bbt)  in onenand_scan_bbt()
197 		bbm->isbad_bbt = onenand_isbad_bbt;  in onenand_scan_bbt()
200 	if ((ret = onenand_memory_bbt(mtd, bd))) {  in onenand_scan_bbt()
201 		printk(KERN_ERR "onenand_scan_bbt: Can't scan flash and build the RAM-based BBT\n");  in onenand_scan_bbt()
202 		kfree(bbm->bbt);  in onenand_scan_bbt()
203 		bbm->bbt = NULL;  in onenand_scan_bbt()
223  * onenand_default_bbt - [OneNAND Interface] Select a default bad block table for the device
224  * @mtd:		MTD device structure
229 int onenand_default_bbt(struct mtd_info *mtd)  in onenand_default_bbt()  argument
231 	struct onenand_chip *this = mtd->priv;  in onenand_default_bbt()
234 	this->bbm = kzalloc(sizeof(struct bbm_info), GFP_KERNEL);  in onenand_default_bbt()
235 	if (!this->bbm)  in onenand_default_bbt()
236 		return -ENOMEM;  in onenand_default_bbt()
238 	bbm = this->bbm;  in onenand_default_bbt()
241 	if (!bbm->badblock_pattern)  in onenand_default_bbt()
242 		bbm->badblock_pattern = &largepage_memorybased;  in onenand_default_bbt()
244 	return onenand_scan_bbt(mtd, bbm->badblock_pattern);  in onenand_default_bbt()