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()
30 	nand->bbt.cache = kcalloc(nwords, sizeof(*nand->bbt.cache),  in nanddev_bbt_init()
32 	if (!nand->bbt.cache)  in nanddev_bbt_init()
33 		return -ENOMEM;  in nanddev_bbt_init()
40  * nanddev_bbt_cleanup() - Cleanup the BBT (Bad Block Table)
41  * @nand: NAND device
45 void nanddev_bbt_cleanup(struct nand_device *nand)  in nanddev_bbt_cleanup()  argument
47 	kfree(nand->bbt.cache);  in nanddev_bbt_cleanup()
52  * nanddev_bbt_update() - Update a BBT
53  * @nand: nand device
55  * Update the BBT. Currently a NOP function since on-flash bbt is not yet
60 int nanddev_bbt_update(struct nand_device *nand)  in nanddev_bbt_update()  argument
67  * nanddev_bbt_get_block_status() - Return the status of an eraseblock
68  * @nand: nand device
69  * @entry: the BBT entry
71  * Return: a positive number nand_bbt_block_status status or -%ERANGE if @entry
72  *	   is bigger than the BBT size.
74 int nanddev_bbt_get_block_status(const struct nand_device *nand,  in nanddev_bbt_get_block_status()  argument
78 	unsigned long *pos = nand->bbt.cache +  in nanddev_bbt_get_block_status()
83 	if (entry >= nanddev_neraseblocks(nand))  in nanddev_bbt_get_block_status()
84 		return -ERANGE;  in nanddev_bbt_get_block_status()
88 		status |= pos[1] << (BITS_PER_LONG - offs);  in nanddev_bbt_get_block_status()
90 	return status & GENMASK(bits_per_block - 1, 0);  in nanddev_bbt_get_block_status()
95  * nanddev_bbt_set_block_status() - Update the status of an eraseblock in the
96  *				    in-memory BBT
97  * @nand: nand device
98  * @entry: the BBT entry to update
101  * Update an entry of the in-memory BBT. If you want to push the updated BBT
102  * the NAND you should call nanddev_bbt_update().
104  * Return: 0 in case of success or -%ERANGE if @entry is bigger than the BBT
107 int nanddev_bbt_set_block_status(struct nand_device *nand, unsigned int entry,  in nanddev_bbt_set_block_status()  argument
111 	unsigned long *pos = nand->bbt.cache +  in nanddev_bbt_set_block_status()
114 	unsigned long val = status & GENMASK(bits_per_block - 1, 0);  in nanddev_bbt_set_block_status()
116 	if (entry >= nanddev_neraseblocks(nand))  in nanddev_bbt_set_block_status()
117 		return -ERANGE;  in nanddev_bbt_set_block_status()
119 	pos[0] &= ~GENMASK(offs + bits_per_block - 1, offs);  in nanddev_bbt_set_block_status()
123 		unsigned int rbits = bits_per_block + offs - BITS_PER_LONG;  in nanddev_bbt_set_block_status()
125 		pos[1] &= ~GENMASK(rbits - 1, 0);  in nanddev_bbt_set_block_status()