Initial import

1 files changed, 141 insertions, 0 deletions

diff --git a/drivers/mtd/nand/sm_common.c b/drivers/mtd/nand/sm_common.c
new file mode 100644
index 000000000..e06b5e5d3
--- /dev/null
+++ b/drivers/mtd/nand/sm_common.c
@@ -0,0 +1,141 @@
+/*
+ * Copyright © 2009 - Maxim Levitsky
+ * Common routines & support for xD format
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+#include <linux/kernel.h>
+#include <linux/mtd/nand.h>
+#include <linux/module.h>
+#include <linux/sizes.h>
+#include "sm_common.h"
+
+static struct nand_ecclayout nand_oob_sm = {
+	.eccbytes = 6,
+	.eccpos = {8, 9, 10, 13, 14, 15},
+	.oobfree = {
+		{.offset = 0 , .length = 4}, /* reserved */
+		{.offset = 6 , .length = 2}, /* LBA1 */
+		{.offset = 11, .length = 2}  /* LBA2 */
+	}
+};
+
+/* NOTE: This layout is is not compatabable with SmartMedia, */
+/* because the 256 byte devices have page depenent oob layout */
+/* However it does preserve the bad block markers */
+/* If you use smftl, it will bypass this and work correctly */
+/* If you not, then you break SmartMedia compliance anyway */
+
+static struct nand_ecclayout nand_oob_sm_small = {
+	.eccbytes = 3,
+	.eccpos = {0, 1, 2},
+	.oobfree = {
+		{.offset = 3 , .length = 2}, /* reserved */
+		{.offset = 6 , .length = 2}, /* LBA1 */
+	}
+};
+
+
+static int sm_block_markbad(struct mtd_info *mtd, loff_t ofs)
+{
+	struct mtd_oob_ops ops;
+	struct sm_oob oob;
+	int ret;
+
+	memset(&oob, -1, SM_OOB_SIZE);
+	oob.block_status = 0x0F;
+
+	/* As long as this function is called on erase block boundaries
+		it will work correctly for 256 byte nand */
+	ops.mode = MTD_OPS_PLACE_OOB;
+	ops.ooboffs = 0;
+	ops.ooblen = mtd->oobsize;
+	ops.oobbuf = (void *)&oob;
+	ops.datbuf = NULL;
+
+
+	ret = mtd_write_oob(mtd, ofs, &ops);
+	if (ret < 0 || ops.oobretlen != SM_OOB_SIZE) {
+		printk(KERN_NOTICE
+			"sm_common: can't mark sector at %i as bad\n",
+								(int)ofs);
+		return -EIO;
+	}
+
+	return 0;
+}
+
+static struct nand_flash_dev nand_smartmedia_flash_ids[] = {
+	LEGACY_ID_NAND("SmartMedia 2MiB 3,3V ROM",   0x5d, 2,   SZ_8K, NAND_ROM),
+	LEGACY_ID_NAND("SmartMedia 4MiB 3,3V",       0xe3, 4,   SZ_8K, 0),
+	LEGACY_ID_NAND("SmartMedia 4MiB 3,3/5V",     0xe5, 4,   SZ_8K, 0),
+	LEGACY_ID_NAND("SmartMedia 4MiB 5V",         0x6b, 4,   SZ_8K, 0),
+	LEGACY_ID_NAND("SmartMedia 4MiB 3,3V ROM",   0xd5, 4,   SZ_8K, NAND_ROM),
+	LEGACY_ID_NAND("SmartMedia 8MiB 3,3V",       0xe6, 8,   SZ_8K, 0),
+	LEGACY_ID_NAND("SmartMedia 8MiB 3,3V ROM",   0xd6, 8,   SZ_8K, NAND_ROM),
+	LEGACY_ID_NAND("SmartMedia 16MiB 3,3V",      0x73, 16,  SZ_16K, 0),
+	LEGACY_ID_NAND("SmartMedia 16MiB 3,3V ROM",  0x57, 16,  SZ_16K, NAND_ROM),
+	LEGACY_ID_NAND("SmartMedia 32MiB 3,3V",      0x75, 32,  SZ_16K, 0),
+	LEGACY_ID_NAND("SmartMedia 32MiB 3,3V ROM",  0x58, 32,  SZ_16K, NAND_ROM),
+	LEGACY_ID_NAND("SmartMedia 64MiB 3,3V",      0x76, 64,  SZ_16K, 0),
+	LEGACY_ID_NAND("SmartMedia 64MiB 3,3V ROM",  0xd9, 64,  SZ_16K, NAND_ROM),
+	LEGACY_ID_NAND("SmartMedia 128MiB 3,3V",     0x79, 128, SZ_16K, 0),
+	LEGACY_ID_NAND("SmartMedia 128MiB 3,3V ROM", 0xda, 128, SZ_16K, NAND_ROM),
+	LEGACY_ID_NAND("SmartMedia 256MiB 3, 3V",    0x71, 256, SZ_16K, 0),
+	LEGACY_ID_NAND("SmartMedia 256MiB 3,3V ROM", 0x5b, 256, SZ_16K, NAND_ROM),
+	{NULL}
+};
+
+static struct nand_flash_dev nand_xd_flash_ids[] = {
+	LEGACY_ID_NAND("xD 16MiB 3,3V",  0x73, 16,   SZ_16K, 0),
+	LEGACY_ID_NAND("xD 32MiB 3,3V",  0x75, 32,   SZ_16K, 0),
+	LEGACY_ID_NAND("xD 64MiB 3,3V",  0x76, 64,   SZ_16K, 0),
+	LEGACY_ID_NAND("xD 128MiB 3,3V", 0x79, 128,  SZ_16K, 0),
+	LEGACY_ID_NAND("xD 256MiB 3,3V", 0x71, 256,  SZ_16K, NAND_BROKEN_XD),
+	LEGACY_ID_NAND("xD 512MiB 3,3V", 0xdc, 512,  SZ_16K, NAND_BROKEN_XD),
+	LEGACY_ID_NAND("xD 1GiB 3,3V",   0xd3, 1024, SZ_16K, NAND_BROKEN_XD),
+	LEGACY_ID_NAND("xD 2GiB 3,3V",   0xd5, 2048, SZ_16K, NAND_BROKEN_XD),
+	{NULL}
+};
+
+int sm_register_device(struct mtd_info *mtd, int smartmedia)
+{
+	struct nand_chip *chip = mtd->priv;
+	int ret;
+
+	chip->options |= NAND_SKIP_BBTSCAN;
+
+	/* Scan for card properties */
+	ret = nand_scan_ident(mtd, 1, smartmedia ?
+		nand_smartmedia_flash_ids : nand_xd_flash_ids);
+
+	if (ret)
+		return ret;
+
+	/* Bad block marker position */
+	chip->badblockpos = 0x05;
+	chip->badblockbits = 7;
+	chip->block_markbad = sm_block_markbad;
+
+	/* ECC layout */
+	if (mtd->writesize == SM_SECTOR_SIZE)
+		chip->ecc.layout = &nand_oob_sm;
+	else if (mtd->writesize == SM_SMALL_PAGE)
+		chip->ecc.layout = &nand_oob_sm_small;
+	else
+		return -ENODEV;
+
+	ret = nand_scan_tail(mtd);
+
+	if (ret)
+		return ret;
+
+	return mtd_device_register(mtd, NULL, 0);
+}
+EXPORT_SYMBOL_GPL(sm_register_device);
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Maxim Levitsky <maximlevitsky@gmail.com>");
+MODULE_DESCRIPTION("Common SmartMedia/xD functions");