10 #define pr_fmt(fmt)	"nand-bbt: " fmt
12 #include <linux/mtd/nand.h>
34  * @nand: NAND device
43 static int nanddev_read_bbt(struct nand_device *nand, u32 block, bool update)  in nanddev_read_bbt()  argument
46 	unsigned int nblocks = nanddev_neraseblocks(nand);  in nanddev_read_bbt()
48 					   BITS_PER_LONG) * sizeof(*nand->bbt.cache);  in nanddev_read_bbt()
49 	struct mtd_info *mtd = nanddev_to_mtd(nand);  in nanddev_read_bbt()
57 	if (!nand->bbt.cache)  in nanddev_read_bbt()
101 	if (update && version > nand->bbt.version) {  in nanddev_read_bbt()
102 		memcpy(nand->bbt.cache, data_buf, nbytes);  in nanddev_read_bbt()
103 		nand->bbt.version = version;  in nanddev_read_bbt()
113 static int nanddev_write_bbt(struct nand_device *nand, u32 block)  in nanddev_write_bbt()  argument
116 	unsigned int nblocks = nanddev_neraseblocks(nand);  in nanddev_write_bbt()
118 					   BITS_PER_LONG) * sizeof(*nand->bbt.cache);  in nanddev_write_bbt()
119 	struct mtd_info *mtd = nanddev_to_mtd(nand);  in nanddev_write_bbt()
127 	BBT_DBG("write_bbt to blk=%d ver=%d\n", block, nand->bbt.version);  in nanddev_write_bbt()
128 	if (!nand->bbt.cache)  in nanddev_write_bbt()
151 	memcpy(data_buf, nand->bbt.cache, nbytes);  in nanddev_write_bbt()
153 	bbt_info->version = nand->bbt.version;  in nanddev_write_bbt()
156 	nanddev_offs_to_pos(nand, block * mtd->erasesize, &pos);  in nanddev_write_bbt()
157 	ret = nand->ops->erase(nand, &pos);  in nanddev_write_bbt()
177 static __maybe_unused int nanddev_bbt_format(struct nand_device *nand)  in nanddev_bbt_format()  argument
179 	unsigned int nblocks = nanddev_neraseblocks(nand);  in nanddev_bbt_format()
180 	struct mtd_info *mtd = nanddev_to_mtd(nand);  in nanddev_bbt_format()
187 		nanddev_offs_to_pos(nand, block * mtd->erasesize, &pos);  in nanddev_bbt_format()
188 		if (nanddev_isbad(nand, &pos))  in nanddev_bbt_format()
189 			nanddev_bbt_set_block_status(nand, block,  in nanddev_bbt_format()
194 		if (nanddev_bbt_get_block_status(nand, start_block + block) ==  in nanddev_bbt_format()
196 			nanddev_bbt_set_block_status(nand, start_block + block,  in nanddev_bbt_format()
203 static int nanddev_scan_bbt(struct nand_device *nand)  in nanddev_scan_bbt()  argument
205 	unsigned int nblocks = nanddev_neraseblocks(nand);  in nanddev_scan_bbt()
209 	nand->bbt.version = 0;  in nanddev_scan_bbt()
212 		nanddev_read_bbt(nand, start_block + block, true);  in nanddev_scan_bbt()
214 	nand->bbt.option |= NANDDEV_BBT_SCANNED;  in nanddev_scan_bbt()
216 	if (nand->bbt.version == 0) {  in nanddev_scan_bbt()
217 		nanddev_bbt_format(nand);  in nanddev_scan_bbt()
218 		ret = nanddev_bbt_update(nand);  in nanddev_scan_bbt()
220 			nand->bbt.option = 0;  in nanddev_scan_bbt()
232  * @nand: NAND device
238 int nanddev_bbt_init(struct nand_device *nand)  in nanddev_bbt_init()  argument
241 	unsigned int nblocks = nanddev_neraseblocks(nand);  in nanddev_bbt_init()
245 	nand->bbt.cache = kcalloc(nwords, sizeof(*nand->bbt.cache),  in nanddev_bbt_init()
247 	if (!nand->bbt.cache)  in nanddev_bbt_init()
256  * @nand: NAND device
260 void nanddev_bbt_cleanup(struct nand_device *nand)  in nanddev_bbt_cleanup()  argument
262 	kfree(nand->bbt.cache);  in nanddev_bbt_cleanup()
268  * @nand: nand device
275 int nanddev_bbt_update(struct nand_device *nand)  in nanddev_bbt_update()  argument
278 	if (nand->bbt.cache &&  in nanddev_bbt_update()
279 	    nand->bbt.option & NANDDEV_BBT_USE_FLASH) {  in nanddev_bbt_update()
280 		unsigned int nblocks = nanddev_neraseblocks(nand);  in nanddev_bbt_update()
288 			ret = nanddev_bbt_get_block_status(nand, start_block + block);  in nanddev_bbt_update()
293 			ret = nanddev_read_bbt(nand, start_block + block,  in nanddev_bbt_update()
313 			nand->bbt.version++;  in nanddev_bbt_update()
314 			ret = nanddev_write_bbt(nand, block_des);  in nanddev_bbt_update()
339  * @nand: nand device
345 int nanddev_bbt_get_block_status(const struct nand_device *nand,  in nanddev_bbt_get_block_status()  argument
349 	unsigned long *pos = nand->bbt.cache +  in nanddev_bbt_get_block_status()
355 	if (nand->bbt.option & NANDDEV_BBT_USE_FLASH &&  in nanddev_bbt_get_block_status()
356 	    !(nand->bbt.option & NANDDEV_BBT_SCANNED))  in nanddev_bbt_get_block_status()
357 		nanddev_scan_bbt((struct nand_device *)nand);  in nanddev_bbt_get_block_status()
360 	if (entry >= nanddev_neraseblocks(nand))  in nanddev_bbt_get_block_status()
374  * @nand: nand device
379  * the NAND you should call nanddev_bbt_update().
384 int nanddev_bbt_set_block_status(struct nand_device *nand, unsigned int entry,  in nanddev_bbt_set_block_status()  argument
388 	unsigned long *pos = nand->bbt.cache +  in nanddev_bbt_set_block_status()
393 	if (entry >= nanddev_neraseblocks(nand))  in nanddev_bbt_set_block_status()