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>
16  * nanddev_bbt_init() - Initialize the BBT (Bad Block Table)
17  * @nand: NAND device
19  * Initialize the in-memory BBT.
23 int nanddev_bbt_init(struct nand_device *nand)  in nanddev_bbt_init()  argument
26 	unsigned int nblocks = nanddev_neraseblocks(nand);  in nanddev_bbt_init()
28 	nand->bbt.cache = bitmap_zalloc(nblocks * bits_per_block, GFP_KERNEL);  in nanddev_bbt_init()
29 	if (!nand->bbt.cache)  in nanddev_bbt_init()
30 		return -ENOMEM;  in nanddev_bbt_init()
37  * nanddev_bbt_cleanup() - Cleanup the BBT (Bad Block Table)
38  * @nand: NAND device
42 void nanddev_bbt_cleanup(struct nand_device *nand)  in nanddev_bbt_cleanup()  argument
44 	bitmap_free(nand->bbt.cache);  in nanddev_bbt_cleanup()
49  * nanddev_bbt_update() - Update a BBT
50  * @nand: nand device
52  * Update the BBT. Currently a NOP function since on-flash bbt is not yet
57 int nanddev_bbt_update(struct nand_device *nand)  in nanddev_bbt_update()  argument
64  * nanddev_bbt_get_block_status() - Return the status of an eraseblock
65  * @nand: nand device
66  * @entry: the BBT entry
68  * Return: a positive number nand_bbt_block_status status or -%ERANGE if @entry
69  *	   is bigger than the BBT size.
71 int nanddev_bbt_get_block_status(const struct nand_device *nand,  in nanddev_bbt_get_block_status()  argument
75 	unsigned long *pos = nand->bbt.cache +  in nanddev_bbt_get_block_status()
80 	if (entry >= nanddev_neraseblocks(nand))  in nanddev_bbt_get_block_status()
81 		return -ERANGE;  in nanddev_bbt_get_block_status()
85 		status |= pos[1] << (BITS_PER_LONG - offs);  in nanddev_bbt_get_block_status()
87 	return status & GENMASK(bits_per_block - 1, 0);  in nanddev_bbt_get_block_status()
92  * nanddev_bbt_set_block_status() - Update the status of an eraseblock in the
93  *				    in-memory BBT
94  * @nand: nand device
95  * @entry: the BBT entry to update
98  * Update an entry of the in-memory BBT. If you want to push the updated BBT
99  * the NAND you should call nanddev_bbt_update().
101  * Return: 0 in case of success or -%ERANGE if @entry is bigger than the BBT
104 int nanddev_bbt_set_block_status(struct nand_device *nand, unsigned int entry,  in nanddev_bbt_set_block_status()  argument
108 	unsigned long *pos = nand->bbt.cache +  in nanddev_bbt_set_block_status()
111 	unsigned long val = status & GENMASK(bits_per_block - 1, 0);  in nanddev_bbt_set_block_status()
113 	if (entry >= nanddev_neraseblocks(nand))  in nanddev_bbt_set_block_status()
114 		return -ERANGE;  in nanddev_bbt_set_block_status()
116 	pos[0] &= ~GENMASK(offs + bits_per_block - 1, offs);  in nanddev_bbt_set_block_status()
120 		unsigned int rbits = bits_per_block + offs - BITS_PER_LONG;  in nanddev_bbt_set_block_status()
122 		pos[1] &= ~GENMASK(rbits - 1, 0);  in nanddev_bbt_set_block_status()
123 		pos[1] |= val >> (bits_per_block - rbits);  in nanddev_bbt_set_block_status()