~hc/RK356X_SDK_RELEASE.git

..	..	@@ -174,6 +174,40 @@
174	174	EXPORT_SYMBOL_GPL(nanddev_mtd_erase);
175	175
176	176	/**
	177	+ * nanddev_mtd_max_bad_blocks() - Get the maximum number of bad eraseblock on
	178	+ * a specific region of the NAND device
	179	+ * @mtd: MTD device
	180	+ * @offs: offset of the NAND region
	181	+ * @len: length of the NAND region
	182	+ *
	183	+ * Default implementation for mtd->_max_bad_blocks(). Only works if
	184	+ * nand->memorg.max_bad_eraseblocks_per_lun is > 0.
	185	+ *
	186	+ * Return: a positive number encoding the maximum number of eraseblocks on a
	187	+ * portion of memory, a negative error code otherwise.
	188	+ */
	189	+int nanddev_mtd_max_bad_blocks(struct mtd_info *mtd, loff_t offs, size_t len)
	190	+{
	191	+ struct nand_device *nand = mtd_to_nanddev(mtd);
	192	+ struct nand_pos pos, end;
	193	+ unsigned int max_bb = 0;
	194	+
	195	+ if (!nand->memorg.max_bad_eraseblocks_per_lun)
	196	+ return -ENOTSUPP;
	197	+
	198	+ nanddev_offs_to_pos(nand, offs, &pos);
	199	+ nanddev_offs_to_pos(nand, offs + len, &end);
	200	+
	201	+ for (nanddev_offs_to_pos(nand, offs, &pos);
	202	+ nanddev_pos_cmp(&pos, &end) < 0;
	203	+ nanddev_pos_next_lun(nand, &pos))
	204	+ max_bb += nand->memorg.max_bad_eraseblocks_per_lun;
	205	+
	206	+ return max_bb;
	207	+}
	208	+EXPORT_SYMBOL_GPL(nanddev_mtd_max_bad_blocks);
	209	+
	210	+/**
177	211	* nanddev_init() - Initialize a NAND device
178	212	* @nand: NAND device
179	213	* @ops: NAND device operations