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authorAndré Fabian Silva Delgado <emulatorman@parabola.nu>2015-08-05 17:04:01 -0300
committerAndré Fabian Silva Delgado <emulatorman@parabola.nu>2015-08-05 17:04:01 -0300
commit57f0f512b273f60d52568b8c6b77e17f5636edc0 (patch)
tree5e910f0e82173f4ef4f51111366a3f1299037a7b /drivers/mtd/nand/sm_common.c
Initial import
Diffstat (limited to 'drivers/mtd/nand/sm_common.c')
-rw-r--r--drivers/mtd/nand/sm_common.c141
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");