freebsd-skq/sys/dev/nand/nand_bbt.c

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/*-
* Copyright (c) 2009-2012 Semihalf
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* $FreeBSD$
*/
#include <sys/cdefs.h>
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/socket.h>
#include <sys/malloc.h>
#include <sys/bus.h>
#include <dev/nand/nand.h>
#include "nand_if.h"
#define BBT_PRIMARY_PATTERN 0x01020304
#define BBT_SECONDARY_PATTERN 0x05060708
enum bbt_place {
BBT_NONE,
BBT_PRIMARY,
BBT_SECONDARY
};
struct nand_bbt {
struct nand_chip *chip;
uint32_t primary_map;
uint32_t secondary_map;
enum bbt_place active;
struct bbt_header *hdr;
uint32_t tab_len;
uint32_t *table;
};
struct bbt_header {
uint32_t pattern;
int32_t seq_nr;
};
static int nand_bbt_save(struct nand_bbt *);
static int nand_bbt_load_hdr(struct nand_bbt *, struct bbt_header *, int8_t);
static int nand_bbt_load_table(struct nand_bbt *);
static int nand_bbt_prescan(struct nand_bbt *);
int
nand_init_bbt(struct nand_chip *chip)
{
struct chip_geom *cg;
struct nand_bbt *bbt;
int err;
cg = &chip->chip_geom;
bbt = malloc(sizeof(struct nand_bbt), M_NAND, M_ZERO | M_WAITOK);
if (!bbt) {
device_printf(chip->dev,
"Cannot allocate memory for bad block struct");
return (ENOMEM);
}
bbt->chip = chip;
bbt->active = BBT_NONE;
bbt->primary_map = cg->chip_size - cg->block_size;
bbt->secondary_map = cg->chip_size - 2 * cg->block_size;
bbt->tab_len = cg->blks_per_chip * sizeof(uint32_t);
bbt->hdr = malloc(sizeof(struct bbt_header) + bbt->tab_len, M_NAND,
M_WAITOK);
if (!bbt->hdr) {
device_printf(chip->dev, "Cannot allocate %d bytes for BB "
"Table", bbt->tab_len);
free(bbt, M_NAND);
return (ENOMEM);
}
bbt->hdr->seq_nr = 0;
bbt->table = (uint32_t *)((uint8_t *)bbt->hdr +
sizeof(struct bbt_header));
err = nand_bbt_load_table(bbt);
if (err) {
free(bbt->table, M_NAND);
free(bbt, M_NAND);
return (err);
}
chip->bbt = bbt;
if (bbt->active == BBT_NONE) {
bbt->active = BBT_PRIMARY;
memset(bbt->table, 0xff, bbt->tab_len);
nand_bbt_prescan(bbt);
nand_bbt_save(bbt);
} else
device_printf(chip->dev, "Found BBT table for chip\n");
return (0);
}
void
nand_destroy_bbt(struct nand_chip *chip)
{
if (chip->bbt) {
nand_bbt_save(chip->bbt);
free(chip->bbt->hdr, M_NAND);
free(chip->bbt, M_NAND);
chip->bbt = NULL;
}
}
int
nand_update_bbt(struct nand_chip *chip)
{
nand_bbt_save(chip->bbt);
return (0);
}
static int
nand_bbt_save(struct nand_bbt *bbt)
{
enum bbt_place next;
uint32_t addr;
int32_t err;
if (bbt->active == BBT_PRIMARY) {
addr = bbt->secondary_map;
bbt->hdr->pattern = BBT_SECONDARY_PATTERN;
next = BBT_SECONDARY;
} else {
addr = bbt->primary_map;
bbt->hdr->pattern = BBT_PRIMARY_PATTERN;
next = BBT_PRIMARY;
}
err = nand_erase_blocks(bbt->chip, addr,
bbt->chip->chip_geom.block_size);
if (err)
return (err);
bbt->hdr->seq_nr++;
err = nand_prog_pages_raw(bbt->chip, addr, bbt->hdr,
bbt->tab_len + sizeof(struct bbt_header));
if (err)
return (err);
bbt->active = next;
return (0);
}
static int
nand_bbt_load_hdr(struct nand_bbt *bbt, struct bbt_header *hdr, int8_t primary)
{
uint32_t addr;
if (primary)
addr = bbt->primary_map;
else
addr = bbt->secondary_map;
return (nand_read_pages_raw(bbt->chip, addr, hdr,
sizeof(struct bbt_header)));
}
static int
nand_bbt_load_table(struct nand_bbt *bbt)
{
struct bbt_header hdr1, hdr2;
uint32_t address = 0;
int err = 0;
bzero(&hdr1, sizeof(hdr1));
bzero(&hdr2, sizeof(hdr2));
nand_bbt_load_hdr(bbt, &hdr1, 1);
if (hdr1.pattern == BBT_PRIMARY_PATTERN) {
bbt->active = BBT_PRIMARY;
address = bbt->primary_map;
} else
bzero(&hdr1, sizeof(hdr1));
nand_bbt_load_hdr(bbt, &hdr2, 0);
if ((hdr2.pattern == BBT_SECONDARY_PATTERN) &&
(hdr2.seq_nr > hdr1.seq_nr)) {
bbt->active = BBT_SECONDARY;
address = bbt->secondary_map;
} else
bzero(&hdr2, sizeof(hdr2));
if (bbt->active != BBT_NONE)
err = nand_read_pages_raw(bbt->chip, address, bbt->hdr,
bbt->tab_len + sizeof(struct bbt_header));
return (err);
}
static int
nand_bbt_prescan(struct nand_bbt *bbt)
{
int32_t i;
uint8_t bad;
bool printed_hash = 0;
device_printf(bbt->chip->dev, "No BBT found. Prescan chip...\n");
for (i = 0; i < bbt->chip->chip_geom.blks_per_chip; i++) {
if (NAND_IS_BLK_BAD(bbt->chip->dev, i, &bad))
return (ENXIO);
if (bad) {
device_printf(bbt->chip->dev, "Bad block(%d)\n", i);
bbt->table[i] = 0x0FFFFFFF;
}
if (!(i % 100)) {
printf("#");
printed_hash = 1;
}
}
if (printed_hash)
printf("\n");
return (0);
}
int
nand_check_bad_block(struct nand_chip *chip, uint32_t block_number)
{
if (!chip || !chip->bbt)
return (0);
if ((chip->bbt->table[block_number] & 0xF0000000) == 0)
return (1);
return (0);
}
int
nand_mark_bad_block(struct nand_chip *chip, uint32_t block_number)
{
chip->bbt->table[block_number] = 0x0FFFFFFF;
return (0);
}