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

SVN-Revision: 16458

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 0000000..b1e9305
--- /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;
+}
+