summaryrefslogtreecommitdiffstats
path: root/sys/dev/nand/nand_bbt.c
diff options
context:
space:
mode:
Diffstat (limited to 'sys/dev/nand/nand_bbt.c')
-rw-r--r--sys/dev/nand/nand_bbt.c273
1 files changed, 273 insertions, 0 deletions
diff --git a/sys/dev/nand/nand_bbt.c b/sys/dev/nand/nand_bbt.c
new file mode 100644
index 0000000..d3f163a
--- /dev/null
+++ b/sys/dev/nand/nand_bbt.c
@@ -0,0 +1,273 @@
+/*-
+ * 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);
+}
OpenPOWER on IntegriCloud