mtd: Add new SmartMedia/xD FTL

This implements new readwrite SmartMedia/xd FTL.

mtd driver must have support proper ECC and badblock verification
based on oob parts for 512 bytes nand.

Also mtd driver must define read_oob and write_oob, which are used
to read and write both data and oob together.

Signed-off-by: Maxim Levitsky <maximlevitsky@gmail.com>
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>

1 files changed, 94 insertions, 0 deletions

diff --git a/drivers/mtd/sm_ftl.h b/drivers/mtd/sm_ftl.h
new file mode 100644
index 000000000000..e30e48e7f63d
--- /dev/null
+++ b/drivers/mtd/sm_ftl.h
@@ -0,0 +1,94 @@
+/*
+ * Copyright © 2009 - Maxim Levitsky
+ * SmartMedia/xD translation layer
+ *
+ * Based loosly on ssfdc.c which is
+ *  © 2005 Eptar srl
+ *  Author: Claudio Lanconelli <lanconelli.claudio@eptar.com>
+ *
+ * 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/mtd/blktrans.h>
+#include <linux/kfifo.h>
+#include <linux/sched.h>
+#include <linux/completion.h>
+#include <linux/mtd/mtd.h>
+
+
+
+struct ftl_zone {
+        int initialized;
+        int16_t *lba_to_phys_table;             /* LBA to physical table */
+        struct kfifo free_sectors;      /* queue of free sectors */
+};
+
+struct sm_ftl {
+        struct mtd_blktrans_dev *trans;
+
+        struct mutex mutex;             /* protects the structure */
+        struct ftl_zone *zones;         /* FTL tables for each zone */
+
+        /* Media information */
+        int block_size;                 /* block size in bytes */
+        int zone_size;                  /* zone size in blocks */
+        int zone_count;                 /* number of zones */
+        int max_lba;                    /* maximum lba in a zone */
+        int smallpagenand;              /* 256 bytes/page nand */
+        int readonly;                   /* is FS readonly */
+        int unstable;
+        int cis_block;                  /* CIS block location */
+        int cis_boffset;                /* CIS offset in the block */
+        int cis_page_offset;            /* CIS offset in the page */
+        void *cis_buffer;               /* tmp buffer for cis reads */
+
+        /* Cache */
+        int cache_block;                /* block number of cached block */
+        int cache_zone;                 /* zone of cached block */
+        unsigned char *cache_data;      /* cached block data */
+        long unsigned int cache_data_invalid_bitmap;
+        int cache_clean;
+        struct work_struct flush_work;
+        struct timer_list timer;
+
+        /* Async erase stuff */
+        struct completion erase_completion;
+
+        /* Geometry stuff */
+        int heads;
+        int sectors;
+        int cylinders;
+
+        struct attribute_group *disk_attributes;
+};
+
+struct chs_entry {
+        unsigned long size;
+        unsigned short cyl;
+        unsigned char head;
+        unsigned char sec;
+};
+
+
+#define SM_FTL_PARTN_BITS       3
+
+#define sm_printk(format, ...) \
+        printk(KERN_WARNING "sm_ftl" ": " format "\n", ## __VA_ARGS__)
+
+#define dbg(format, ...) \
+        if (debug) \
+                printk(KERN_DEBUG "sm_ftl" ": " format "\n", ## __VA_ARGS__)
+
+#define dbg_verbose(format, ...) \
+        if (debug > 1) \
+                printk(KERN_DEBUG "sm_ftl" ": " format "\n", ## __VA_ARGS__)
+
+
+static void sm_erase_callback(struct erase_info *self);
+static int sm_erase_block(struct sm_ftl *ftl, int zone_num, uint16_t block,
+                                                                int put_free);
+static void sm_mark_block_bad(struct sm_ftl *ftl, int zone_num, int block);
+
+static int sm_recheck_media(struct sm_ftl *ftl);