1 // SPDX-License-Identifier: GPL-2.0
6  *	Boris Brezillon <boris.brezillon@free-electrons.com>
10 #define pr_fmt(fmt)	"nand-bbt: " fmt
12 #include <linux/mtd/nand.h>
18  * nanddev_bbt_init() - Initialize the BBT (Bad Block Table)
19  * @nand: NAND device
21  * Initialize the in-memory BBT.
25 int nanddev_bbt_init(struct nand_device *nand)  in nanddev_bbt_init()  argument
28 	unsigned int nblocks = nanddev_neraseblocks(nand);  in nanddev_bbt_init()
32 	nand->bbt.cache = kzalloc(nwords, GFP_KERNEL);  in nanddev_bbt_init()
33 	if (!nand->bbt.cache)  in nanddev_bbt_init()
34 		return -ENOMEM;  in nanddev_bbt_init()
41  * nanddev_bbt_cleanup() - Cleanup the BBT (Bad Block Table)
42  * @nand: NAND device
46 void nanddev_bbt_cleanup(struct nand_device *nand)  in nanddev_bbt_cleanup()  argument
48 	kfree(nand->bbt.cache);  in nanddev_bbt_cleanup()
53  * nanddev_bbt_update() - Update a BBT
54  * @nand: nand device
56  * Update the BBT. Currently a NOP function since on-flash bbt is not yet
61 int nanddev_bbt_update(struct nand_device *nand)  in nanddev_bbt_update()  argument
68  * nanddev_bbt_get_block_status() - Return the status of an eraseblock
69  * @nand: nand device
70  * @entry: the BBT entry
72  * Return: a positive number nand_bbt_block_status status or -%ERANGE if @entry
73  *	   is bigger than the BBT size.
75 int nanddev_bbt_get_block_status(const struct nand_device *nand,  in nanddev_bbt_get_block_status()  argument
79 	unsigned long *pos = nand->bbt.cache +  in nanddev_bbt_get_block_status()
84 	if (entry >= nanddev_neraseblocks(nand))  in nanddev_bbt_get_block_status()
85 		return -ERANGE;  in nanddev_bbt_get_block_status()
89 		status |= pos[1] << (BITS_PER_LONG - offs);  in nanddev_bbt_get_block_status()
91 	return status & GENMASK(bits_per_block - 1, 0);  in nanddev_bbt_get_block_status()
96  * nanddev_bbt_set_block_status() - Update the status of an eraseblock in the
97  *				    in-memory BBT
98  * @nand: nand device
99  * @entry: the BBT entry to update
102  * Update an entry of the in-memory BBT. If you want to push the updated BBT
103  * the NAND you should call nanddev_bbt_update().
105  * Return: 0 in case of success or -%ERANGE if @entry is bigger than the BBT
108 int nanddev_bbt_set_block_status(struct nand_device *nand, unsigned int entry,  in nanddev_bbt_set_block_status()  argument
112 	unsigned long *pos = nand->bbt.cache +  in nanddev_bbt_set_block_status()
115 	unsigned long val = status & GENMASK(bits_per_block - 1, 0);  in nanddev_bbt_set_block_status()
117 	if (entry >= nanddev_neraseblocks(nand))  in nanddev_bbt_set_block_status()
118 		return -ERANGE;  in nanddev_bbt_set_block_status()
120 	pos[0] &= ~GENMASK(offs + bits_per_block - 1, offs);  in nanddev_bbt_set_block_status()
124 		unsigned int rbits = bits_per_block + offs - BITS_PER_LONG;  in nanddev_bbt_set_block_status()
126 		pos[1] &= ~GENMASK(rbits - 1, 0);  in nanddev_bbt_set_block_status()