1 files changed, 148 insertions, 0 deletions

diff --git a/drivers/mtd/nand/sm_common.c b/drivers/mtd/nand/sm_common.c
new file mode 100644
index 000000000000..ac80fb362e63
--- /dev/null
+++ b/drivers/mtd/nand/sm_common.c
@@ -0,0 +1,148 @@
+/*
+ * 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 "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, error = 0;
+
+        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_OOB_PLACE;
+        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);
+                error = -EIO;
+        } else
+                mtd->ecc_stats.badblocks++;
+
+        return error;
+}
+
+
+static struct nand_flash_dev nand_smartmedia_flash_ids[] = {
+        {"SmartMedia 1MiB 5V",          0x6e, 256, 1, 0x1000, 0},
+        {"SmartMedia 1MiB 3,3V",        0xe8, 256, 1, 0x1000, 0},
+        {"SmartMedia 1MiB 3,3V",        0xec, 256, 1, 0x1000, 0},
+        {"SmartMedia 2MiB 3,3V",        0xea, 256, 2, 0x1000, 0},
+        {"SmartMedia 2MiB 5V",          0x64, 256, 2, 0x1000, 0},
+        {"SmartMedia 2MiB 3,3V ROM",    0x5d, 512, 2, 0x2000, NAND_ROM},
+        {"SmartMedia 4MiB 3,3V",        0xe3, 512, 4, 0x2000, 0},
+        {"SmartMedia 4MiB 3,3/5V",      0xe5, 512, 4, 0x2000, 0},
+        {"SmartMedia 4MiB 5V",          0x6b, 512, 4, 0x2000, 0},
+        {"SmartMedia 4MiB 3,3V ROM",    0xd5, 512, 4, 0x2000, NAND_ROM},
+        {"SmartMedia 8MiB 3,3V",        0xe6, 512, 8, 0x2000, 0},
+        {"SmartMedia 8MiB 3,3V ROM",    0xd6, 512, 8, 0x2000, NAND_ROM},
+        {"SmartMedia 16MiB 3,3V",       0x73, 512, 16, 0x4000, 0},
+        {"SmartMedia 16MiB 3,3V ROM",   0x57, 512, 16, 0x4000, NAND_ROM},
+        {"SmartMedia 32MiB 3,3V",       0x75, 512, 32, 0x4000, 0},
+        {"SmartMedia 32MiB 3,3V ROM",   0x58, 512, 32, 0x4000, NAND_ROM},
+        {"SmartMedia 64MiB 3,3V",       0x76, 512, 64, 0x4000, 0},
+        {"SmartMedia 64MiB 3,3V ROM",   0xd9, 512, 64, 0x4000, NAND_ROM},
+        {"SmartMedia 128MiB 3,3V",      0x79, 512, 128, 0x4000, 0},
+        {"SmartMedia 128MiB 3,3V ROM",  0xda, 512, 128, 0x4000, NAND_ROM},
+        {"SmartMedia 256MiB 3,3V",      0x71, 512, 256, 0x4000 },
+        {"SmartMedia 256MiB 3,3V ROM",  0x5b, 512, 256, 0x4000, NAND_ROM},
+        {NULL,}
+};
+
+#define XD_TYPEM       (NAND_NO_AUTOINCR | NAND_BROKEN_XD)
+static struct nand_flash_dev nand_xd_flash_ids[] = {
+
+        {"xD 16MiB 3,3V",    0x73, 512, 16, 0x4000, 0},
+        {"xD 32MiB 3,3V",    0x75, 512, 32, 0x4000, 0},
+        {"xD 64MiB 3,3V",    0x76, 512, 64, 0x4000, 0},
+        {"xD 128MiB 3,3V",   0x79, 512, 128, 0x4000, 0},
+        {"xD 256MiB 3,3V",   0x71, 512, 256, 0x4000, XD_TYPEM},
+        {"xD 512MiB 3,3V",   0xdc, 512, 512, 0x4000, XD_TYPEM},
+        {"xD 1GiB 3,3V",     0xd3, 512, 1024, 0x4000, XD_TYPEM},
+        {"xD 2GiB 3,3V",     0xd5, 512, 2048, 0x4000, XD_TYPEM},
+        {NULL,}
+};
+
+int sm_register_device(struct mtd_info *mtd, int smartmedia)
+{
+        struct nand_chip *chip = (struct nand_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 postion */
+        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 add_mtd_device(mtd);
+}
+EXPORT_SYMBOL_GPL(sm_register_device);
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Maxim Levitsky <maximlevitsky@gmail.com>");
+MODULE_DESCRIPTION("Common SmartMedia/xD functions");