firmware-utils: add a small utility for generating nand flash images with ecc info

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@16458 3c298f89-4303-0410-b956-a3cf2f4a3e73

1 files changed, 204 insertions, 0 deletions

diff --git a/tools/firmware-utils/src/nand_ecc.c b/tools/firmware-utils/src/nand_ecc.c
new file mode 100644
index 0000000000..e270480d73
--- /dev/null
+++ b/tools/firmware-utils/src/nand_ecc.c
@@ -0,0 +1,204 @@
+/*

+ * calculate ecc code for nand flash

+ *

+ * Copyright (C) 2008 yajin <yajin@vm-kernel.org>

+ * Copyright (C) 2009 Felix Fietkau <nbd@openwrt.org>

+ *

+ * This program is free software; you can redistribute it and/or

+ * modify it under the terms of the GNU General Public License as

+ * published by the Free Software Foundation; either version 2 or

+ * (at your option) version 3 of the License.

+ *

+ * This program is distributed in the hope that it will be useful,

+ * but WITHOUT ANY WARRANTY; without even the implied warranty of

+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

+ * GNU General Public License for more details.

+ *

+ * You should have received a copy of the GNU General Public License

+ * along with this program; if not, write to the Free Software

+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston,

+ * MA 02111-1307 USA

+ */

+

+

+#include <sys/types.h>

+#include <sys/stat.h>

+#include <unistd.h>

+#include <stdlib.h>

+#include <stdint.h>

+#include <fcntl.h>

+#include <stdio.h>

+

+#define DEF_NAND_PAGE_SIZE   2048

+#define DEF_NAND_OOB_SIZE     64

+#define DEF_NAND_ECC_OFFSET   0x28

+

+static int page_size = DEF_NAND_PAGE_SIZE;

+static int oob_size = DEF_NAND_OOB_SIZE;

+static int ecc_offset = DEF_NAND_ECC_OFFSET;

+

+/*

+ * Pre-calculated 256-way 1 byte column parity

+ */

+static const uint8_t nand_ecc_precalc_table[] = {

+	0x00, 0x55, 0x56, 0x03, 0x59, 0x0c, 0x0f, 0x5a, 0x5a, 0x0f, 0x0c, 0x59, 0x03, 0x56, 0x55, 0x00,

+	0x65, 0x30, 0x33, 0x66, 0x3c, 0x69, 0x6a, 0x3f, 0x3f, 0x6a, 0x69, 0x3c, 0x66, 0x33, 0x30, 0x65,

+	0x66, 0x33, 0x30, 0x65, 0x3f, 0x6a, 0x69, 0x3c, 0x3c, 0x69, 0x6a, 0x3f, 0x65, 0x30, 0x33, 0x66,

+	0x03, 0x56, 0x55, 0x00, 0x5a, 0x0f, 0x0c, 0x59, 0x59, 0x0c, 0x0f, 0x5a, 0x00, 0x55, 0x56, 0x03,

+	0x69, 0x3c, 0x3f, 0x6a, 0x30, 0x65, 0x66, 0x33, 0x33, 0x66, 0x65, 0x30, 0x6a, 0x3f, 0x3c, 0x69,

+	0x0c, 0x59, 0x5a, 0x0f, 0x55, 0x00, 0x03, 0x56, 0x56, 0x03, 0x00, 0x55, 0x0f, 0x5a, 0x59, 0x0c,

+	0x0f, 0x5a, 0x59, 0x0c, 0x56, 0x03, 0x00, 0x55, 0x55, 0x00, 0x03, 0x56, 0x0c, 0x59, 0x5a, 0x0f,

+	0x6a, 0x3f, 0x3c, 0x69, 0x33, 0x66, 0x65, 0x30, 0x30, 0x65, 0x66, 0x33, 0x69, 0x3c, 0x3f, 0x6a,

+	0x6a, 0x3f, 0x3c, 0x69, 0x33, 0x66, 0x65, 0x30, 0x30, 0x65, 0x66, 0x33, 0x69, 0x3c, 0x3f, 0x6a,

+	0x0f, 0x5a, 0x59, 0x0c, 0x56, 0x03, 0x00, 0x55, 0x55, 0x00, 0x03, 0x56, 0x0c, 0x59, 0x5a, 0x0f,

+	0x0c, 0x59, 0x5a, 0x0f, 0x55, 0x00, 0x03, 0x56, 0x56, 0x03, 0x00, 0x55, 0x0f, 0x5a, 0x59, 0x0c,

+	0x69, 0x3c, 0x3f, 0x6a, 0x30, 0x65, 0x66, 0x33, 0x33, 0x66, 0x65, 0x30, 0x6a, 0x3f, 0x3c, 0x69,

+	0x03, 0x56, 0x55, 0x00, 0x5a, 0x0f, 0x0c, 0x59, 0x59, 0x0c, 0x0f, 0x5a, 0x00, 0x55, 0x56, 0x03,

+	0x66, 0x33, 0x30, 0x65, 0x3f, 0x6a, 0x69, 0x3c, 0x3c, 0x69, 0x6a, 0x3f, 0x65, 0x30, 0x33, 0x66,

+	0x65, 0x30, 0x33, 0x66, 0x3c, 0x69, 0x6a, 0x3f, 0x3f, 0x6a, 0x69, 0x3c, 0x66, 0x33, 0x30, 0x65,

+	0x00, 0x55, 0x56, 0x03, 0x59, 0x0c, 0x0f, 0x5a, 0x5a, 0x0f, 0x0c, 0x59, 0x03, 0x56, 0x55, 0x00

+};

+

+/**

+ * nand_calculate_ecc - [NAND Interface] Calculate 3-byte ECC for 256-byte block

+ * @dat:	raw data

+ * @ecc_code:	buffer for ECC

+ */

+int nand_calculate_ecc(const uint8_t *dat,

+		       uint8_t *ecc_code)

+{

+	uint8_t idx, reg1, reg2, reg3, tmp1, tmp2;

+	int i;

+

+	/* Initialize variables */

+	reg1 = reg2 = reg3 = 0;

+

+	/* Build up column parity */

+	for(i = 0; i < 256; i++) {

+		/* Get CP0 - CP5 from table */

+		idx = nand_ecc_precalc_table[*dat++];

+		reg1 ^= (idx & 0x3f);

+

+		/* All bit XOR = 1 ? */

+		if (idx & 0x40) {

+			reg3 ^= (uint8_t) i;

+			reg2 ^= ~((uint8_t) i);

+		}

+	}

+

+	/* Create non-inverted ECC code from line parity */

+	tmp1  = (reg3 & 0x80) >> 0; /* B7 -> B7 */

+	tmp1 |= (reg2 & 0x80) >> 1; /* B7 -> B6 */

+	tmp1 |= (reg3 & 0x40) >> 1; /* B6 -> B5 */

+	tmp1 |= (reg2 & 0x40) >> 2; /* B6 -> B4 */

+	tmp1 |= (reg3 & 0x20) >> 2; /* B5 -> B3 */

+	tmp1 |= (reg2 & 0x20) >> 3; /* B5 -> B2 */

+	tmp1 |= (reg3 & 0x10) >> 3; /* B4 -> B1 */

+	tmp1 |= (reg2 & 0x10) >> 4; /* B4 -> B0 */

+

+	tmp2  = (reg3 & 0x08) << 4; /* B3 -> B7 */

+	tmp2 |= (reg2 & 0x08) << 3; /* B3 -> B6 */

+	tmp2 |= (reg3 & 0x04) << 3; /* B2 -> B5 */

+	tmp2 |= (reg2 & 0x04) << 2; /* B2 -> B4 */

+	tmp2 |= (reg3 & 0x02) << 2; /* B1 -> B3 */

+	tmp2 |= (reg2 & 0x02) << 1; /* B1 -> B2 */

+	tmp2 |= (reg3 & 0x01) << 1; /* B0 -> B1 */

+	tmp2 |= (reg2 & 0x01) << 0; /* B7 -> B0 */

+

+	/* Calculate final ECC code */

+#ifdef CONFIG_MTD_NAND_ECC_SMC

+	ecc_code[0] = ~tmp2;

+	ecc_code[1] = ~tmp1;

+#else

+	ecc_code[0] = ~tmp1;

+	ecc_code[1] = ~tmp2;

+#endif

+	ecc_code[2] = ((~reg1) << 2) | 0x03;

+

+	return 0;

+}

+

+/*

+ *  usage: bb-nandflash-ecc    start_address  size

+ */

+void usage(const char *prog)

+{

+	fprintf(stderr, "Usage: %s [options] <input> <output>\n"

+		"Options:\n"

+		"    -p <pagesize>      NAND page size (default: %d)\n"

+		"    -o <oobsize>       NAND OOB size (default: %d)\n"

+		"    -e <offset>        NAND ECC offset (default: %d)\n"

+		"\n", prog, DEF_NAND_PAGE_SIZE, DEF_NAND_OOB_SIZE,

+		DEF_NAND_ECC_OFFSET);

+	exit(1);

+}

+

+/*start_address/size does not include oob

+  */

+int main(int argc, char **argv)

+{

+	uint8_t *page_data = NULL;

+	uint8_t *ecc_data;

+	int infd = -1, outfd = -1;

+	int ret = 1;

+	ssize_t bytes;

+	int ch;

+

+	while ((ch = getopt(argc, argv, "e:o:p:")) != -1) {

+		switch(ch) {

+		case 'p':

+			page_size = strtoul(optarg, NULL, 0);

+			break;

+		case 'o':

+			oob_size = strtoul(optarg, NULL, 0);

+			break;

+		case 'e':

+			ecc_offset = strtoul(optarg, NULL, 0);

+			break;

+		default:

+			usage(argv[0]);

+		}

+	}

+	argc -= optind;

+	if (argc < 2)

+		usage(argv[0]);

+

+	argv += optind;

+

+	infd = open(argv[0], O_RDONLY, 0);

+	if (infd < 0) {

+		perror("open input file");

+		goto out;

+	}

+

+	outfd = open(argv[1], O_WRONLY|O_CREAT|O_TRUNC, 0644);

+	if (outfd < 0) {

+		perror("open output file");

+		goto out;

+	}

+

+	page_data = malloc(page_size + oob_size);

+

+	while ((bytes = read(infd, page_data, page_size)) == page_size) {

+		int j;

+

+		ecc_data = page_data + page_size + ecc_offset;

+		for (j = 0; j < page_size / 256; j++)

+		{

+			nand_calculate_ecc(page_data + j * 256, ecc_data);

+			ecc_data += 3;

+		}

+		write(outfd, page_data, page_size + oob_size);

+	}

+

+	ret = 0;

+out:

+	if (infd >= 0)

+		close(infd);

+	if (outfd >= 0)

+		close(outfd);

+	if (page_data)

+		free(page_data);

+	return ret;

+}

+