From: Lee Jones <lee.jones@linaro.org>
To: linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org
Cc: angus.clark@st.com, kernel@stlinux.com, lee.jones@linaro.org,
linux-mtd@lists.infradead.org, pekon@ti.com,
computersforpeace@gmail.com, dwmw2@infradead.org
Subject: [RFC 24/47] mtd: nand: stm_nand_bch: find IBBT signature
Date: Tue, 25 Mar 2014 08:19:41 +0000 [thread overview]
Message-ID: <1395735604-26706-25-git-send-email-lee.jones@linaro.org> (raw)
In-Reply-To: <1395735604-26706-1-git-send-email-lee.jones@linaro.org>
Scan block for IBBT signature, either "Bbt0" or "1tbB" from
pre-specified data block.
Signed-off-by: Lee Jones <lee.jones@linaro.org>
---
drivers/mtd/nand/stm_nand_bch.c | 91 +++++++++++++++++++++++++++++++++++++++++
1 file changed, 91 insertions(+)
diff --git a/drivers/mtd/nand/stm_nand_bch.c b/drivers/mtd/nand/stm_nand_bch.c
index 6323590..5bcaabbc 100644
--- a/drivers/mtd/nand/stm_nand_bch.c
+++ b/drivers/mtd/nand/stm_nand_bch.c
@@ -43,6 +43,37 @@ static int bch_ecc_sizes[] = {
[BCH_NO_ECC] = 0,
};
+/*
+ * Inband Bad Block Table (IBBT)
+ */
+#define NAND_IBBT_NBLOCKS 4
+#define NAND_IBBT_SIGLEN 4
+#define NAND_IBBT_PRIMARY 0
+#define NAND_IBBT_MIRROR 1
+#define NAND_IBBT_SCHEMA 0x10
+#define NAND_IBBT_BCH_SCHEMA 0x10
+
+static uint8_t ibbt_sigs[2][NAND_IBBT_SIGLEN] = {
+ {'B', 'b', 't', '0'},
+ {'1', 't', 'b', 'B'},
+};
+
+/* IBBT header */
+struct nand_ibbt_header {
+ uint8_t signature[4]; /* "Bbt0" or "1tbB" signature */
+ uint8_t version; /* BBT version ("age") */
+ uint8_t reserved[3]; /* padding */
+ uint8_t schema[4]; /* "base" schema (x4) */
+} __packed;
+
+/* Extend IBBT header with some stm-nand-bch niceties */
+struct nand_ibbt_bch_header {
+ struct nand_ibbt_header base;
+ uint8_t schema[4]; /* "private" schema (x4) */
+ uint8_t ecc_size[4]; /* ECC bytes (0, 32, 54) (x4) */
+ char author[64]; /* Arbitrary string for S/W to use */
+} __packed;
+
/* Bad Block Table (BBT) */
struct nandi_bbt_info {
uint32_t bbt_size; /* Size of bad-block table */
@@ -464,6 +495,66 @@ static uint8_t bch_write_page(struct nandi_controller *nandi,
return status;
}
+/* Scan block for IBBT signature */
+static int bch_find_ibbt_sig(struct nandi_controller *nandi,
+ uint32_t block, int *bak, uint8_t *vers,
+ char *author)
+{
+ struct mtd_info *mtd = &nandi->info.mtd;
+ struct nand_ibbt_bch_header *ibbt_header;
+ loff_t offs;
+ uint8_t *buf = nandi->page_buf;
+ int match_sig;
+ unsigned int b;
+ unsigned int i;
+
+ nandi->cached_page = -1;
+
+ /* Load last page of block */
+ offs = (loff_t)block << nandi->block_shift;
+ offs += mtd->erasesize - mtd->writesize;
+ if (bch_read_page(nandi, offs, buf) < 0) {
+ dev_info(nandi->dev,
+ "Uncorrectable ECC error while scanning BBT signature at block %u [0x%012llx]\n",
+ block, offs);
+ return 0;
+ }
+ ibbt_header = (struct nand_ibbt_bch_header *)buf;
+
+ /* Test IBBT signature */
+ match_sig = 0;
+ for (b = 0; b < 2 && !match_sig; b++) {
+ match_sig = 1;
+ for (i = 0; i < NAND_IBBT_SIGLEN; i++) {
+ if (ibbt_header->base.signature[i] != ibbt_sigs[b][i]) {
+ match_sig = 0;
+ break;
+ }
+ }
+
+ }
+
+ if (!match_sig)
+ return 0; /* Failed to match IBBT signature */
+
+ /* Test IBBT schema */
+ for (i = 0; i < 4; i++)
+ if (ibbt_header->base.schema[i] != NAND_IBBT_SCHEMA)
+ return 0;
+
+ /* Test IBBT BCH schema */
+ for (i = 0; i < 4; i++)
+ if (ibbt_header->schema[i] != NAND_IBBT_BCH_SCHEMA)
+ return 0;
+
+ /* We have a match */
+ *vers = ibbt_header->base.version;
+ *bak = b - 1;
+ strncpy(author, ibbt_header->author, 64);
+
+ return 1;
+}
+
/*
* Initialisation
*/
--
1.8.3.2
next prev parent reply other threads:[~2014-03-25 8:21 UTC|newest]
Thread overview: 77+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-03-25 8:19 [RFC 00/47] mtd: nand: Add new driver supporting ST's BCH h/w Lee Jones
2014-03-25 8:19 ` [RFC 01/47] mtd: nand: export useful functions from core driver Lee Jones
2014-03-25 12:57 ` Ezequiel Garcia
2014-03-25 14:58 ` Lee Jones
2014-03-25 8:19 ` [RFC 02/47] mtd: nand: add ONFI NAND Timing Mode Specifications Lee Jones
2014-03-25 17:01 ` Jason Gunthorpe
2014-03-25 8:19 ` [RFC 03/47] mtd: nand: add shared register defines for ST's NAND Controller drivers Lee Jones
2014-03-25 8:19 ` [RFC 04/47] mtd: nand: adding ST's BCH NAND Controller driver Lee Jones
2014-03-25 8:19 ` [RFC 05/47] mtd: nand: stm_nand_bch: IRQ support for " Lee Jones
2014-03-26 7:10 ` Gupta, Pekon
2014-03-25 8:19 ` [RFC 06/47] mtd: nand: stm_nand_bch: change between BCH and Hamming modes Lee Jones
2014-03-25 8:19 ` [RFC 07/47] mtd: nand: stm_nand_bch: initialise the BCH Controller Lee Jones
2014-03-26 10:25 ` Gupta, Pekon
2014-04-30 10:22 ` Lee Jones
2014-04-30 10:59 ` Gupta, Pekon
2014-04-30 12:29 ` Lee Jones
2014-03-25 8:19 ` [RFC 08/47] mtd: nand: stm_nand_bch: supply clock support Lee Jones
2014-03-26 7:15 ` Gupta, Pekon
2014-03-25 8:19 ` [RFC 09/47] mtd: nand: stm_nand_bch: introduce and initialise some important data structures Lee Jones
2014-03-25 8:19 ` [RFC 10/47] mtd: nand: stm_nand_bch: initialise the Hamming Controller Lee Jones
2014-03-25 8:19 ` [RFC 11/47] mtd: nand: stm_nand_bch: add Power Management Lee Jones
2014-03-25 8:19 ` [RFC 12/47] mtd: nand: stm_nand_bch: scan for NAND devices Lee Jones
2014-03-25 8:19 ` [RFC 13/47] mtd: nand: stm_nand_bch: provide Device Tree support Lee Jones
2014-03-26 9:18 ` Gupta, Pekon
2014-04-30 12:54 ` Lee Jones
2014-05-05 6:55 ` Gupta, Pekon
2014-05-09 10:03 ` Lee Jones
2014-05-09 10:32 ` Gupta, Pekon
2014-05-09 10:38 ` Lee Jones
2014-05-19 14:02 ` Lee Jones
2014-03-25 8:19 ` [RFC 14/47] mtd: nand: stm_nand_bch: configure BCH and FLEX by ONFI timing mode Lee Jones
2014-03-25 8:19 ` [RFC 15/47] mtd: nand: stm_nand_bch: add compatible page size check Lee Jones
2014-03-25 8:19 ` [RFC 16/47] mtd: nand: stm_nand_bch: derive some working variables for latter use Lee Jones
2014-03-25 8:19 ` [RFC 17/47] mtd: nand: stm_nand_bch: automatically set EEC mode if requested Lee Jones
2014-03-25 8:19 ` [RFC 18/47] mtd: nand: stm_nand_bch: ensure configuration is compatible with this driver Lee Jones
2014-03-25 8:19 ` [RFC 19/47] mtd: nand: stm_nand_bch: configure BCH read/write/erase programs Lee Jones
2014-03-25 8:19 ` [RFC 20/47] mtd: nand: stm_nand_bch: initialise working buffers Lee Jones
2014-03-25 8:19 ` [RFC 21/47] mtd: nand: stm_nand_bch: provide shared BCH operations Lee Jones
2014-03-25 8:19 ` [RFC 22/47] mtd: nand: stm_nand_bch: check erased page for zeros Lee Jones
2014-03-25 8:19 ` [RFC 23/47] mtd: nand: stm_nand_bch: read and write page (BCH) Lee Jones
2014-03-26 10:17 ` Gupta, Pekon
2014-04-30 11:19 ` Lee Jones
2014-03-25 8:19 ` Lee Jones [this message]
2014-03-25 8:19 ` [RFC 25/47] mtd: nand: stm_nand_bch: bad block marking helpers Lee Jones
2014-03-25 8:19 ` [RFC 26/47] mtd: nand: stm_nand_bch: populate IBBT BCH Header Lee Jones
2014-03-25 8:19 ` [RFC 27/47] mtd: nand: stm_nand_bch: write IBBT to Flash Lee Jones
2014-03-25 8:19 ` [RFC 28/47] mtd: nand: stm_nand_bch: update flash-resident BBT(s) Lee Jones
2014-03-25 8:19 ` [RFC 29/47] mtd: nand: stm_nand_bch: add Hamming-FLEX operations Lee Jones
2014-03-25 8:19 ` [RFC 30/47] mtd: nand: stm_nand_bch: read and write raw (FLEX) Lee Jones
2014-03-25 8:19 ` [RFC 31/47] mtd: nand: stm_nand_bch: scan block for BBM(s) according to specified BBT options Lee Jones
2014-03-25 8:19 ` [RFC 32/47] mtd: nand: stm_nand_bch: scan for BBMs and build memory-resident BBT Lee Jones
2014-03-25 8:19 ` [RFC 33/47] mtd: nand: stm_nand_bch: search for and load flash-resident BBT Lee Jones
2014-03-25 8:19 ` [RFC 34/47] mtd: nand: stm_nand_bch: " Lee Jones
2014-03-25 8:19 ` [RFC 35/47] mtd: nand: stm_nand_bch: dump bad blocks Lee Jones
2014-03-25 12:53 ` Ezequiel Garcia
2014-03-25 8:19 ` [RFC 36/47] mtd: nand: stm_nand_bch: parse partitions and register an MTD device Lee Jones
2014-03-25 8:19 ` [RFC 37/47] mtd: nand: stm_nand_bch: fetch the bit-flips threshold Lee Jones
2014-03-25 8:19 ` [RFC 38/47] mtd: nand: stm_nand_bch: check WP (FLEX) Lee Jones
2014-03-25 8:19 ` [RFC 39/47] mtd: nand: stm_nand_bch: read and write ops (FLEX) Lee Jones
2014-03-25 8:19 ` [RFC 40/47] mtd: nand: stm_nand_bch: MTD erase (BCH) Lee Jones
2014-03-25 8:19 ` [RFC 41/47] mtd: nand: stm_nand_bch: MTD mark and check for bad blocks (BCH) Lee Jones
2014-03-25 8:19 ` [RFC 42/47] mtd: nand: stm_nand_bch: add read and write OOB (BCH) Lee Jones
2014-03-25 8:20 ` [RFC 43/47] mtd: nand: stm_nand_bch: read and write functions (BCH) Lee Jones
2014-03-26 10:31 ` Gupta, Pekon
2014-04-30 9:19 ` Lee Jones
2014-03-25 8:20 ` [RFC 44/47] mtd: nand: stm_nand_bch: MTD read and write (BCH) Lee Jones
2014-03-25 8:20 ` [RFC 45/47] mtd: nand: stm_nand_bch: read and write buffers (FLEX) Lee Jones
2014-03-25 8:20 ` [RFC 46/47] mtd: nand: mtd_nand_bch: add remaining FLEX functions Lee Jones
2014-03-25 8:20 ` [RFC 47/47] mtd: nand: stm_nand_bch: catch unsupported calls Lee Jones
2014-03-25 12:50 ` [RFC 00/47] mtd: nand: Add new driver supporting ST's BCH h/w Ezequiel Garcia
2014-03-25 13:11 ` Lee Jones
2014-03-25 22:00 ` Ezequiel Garcia
2014-03-26 7:28 ` Brian Norris
2014-03-27 10:28 ` Lee Jones
2014-04-01 11:29 ` Lee Jones
2014-04-10 20:00 ` Brian Norris
2014-04-30 9:57 ` Lee Jones
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