1 /* SPDX-License-Identifier: GPL-2.0-only */
2 /*
3  * Copyright © 2009 - Maxim Levitsky
4  * SmartMedia/xD translation layer
5  *
6  * Based loosly on ssfdc.c which is
7  *  © 2005 Eptar srl
8  *  Author: Claudio Lanconelli <lanconelli.claudio@eptar.com>
9  */
10 
11 #include <linux/mtd/blktrans.h>
12 #include <linux/kfifo.h>
13 #include <linux/sched.h>
14 #include <linux/completion.h>
15 #include <linux/mtd/mtd.h>
16 
17 
18 
19 struct ftl_zone {
20 	bool initialized;
21 	int16_t *lba_to_phys_table;		/* LBA to physical table */
22 	struct kfifo free_sectors;	/* queue of free sectors */
23 };
24 
25 struct sm_ftl {
26 	struct mtd_blktrans_dev *trans;
27 
28 	struct mutex mutex;		/* protects the structure */
29 	struct ftl_zone *zones;		/* FTL tables for each zone */
30 
31 	/* Media information */
32 	int block_size;			/* block size in bytes */
33 	int zone_size;			/* zone size in blocks */
34 	int zone_count;			/* number of zones */
35 	int max_lba;			/* maximum lba in a zone */
36 	int smallpagenand;		/* 256 bytes/page nand */
37 	bool readonly;			/* is FS readonly */
38 	bool unstable;
39 	int cis_block;			/* CIS block location */
40 	int cis_boffset;		/* CIS offset in the block */
41 	int cis_page_offset;		/* CIS offset in the page */
42 	void *cis_buffer;		/* tmp buffer for cis reads */
43 
44 	/* Cache */
45 	int cache_block;		/* block number of cached block */
46 	int cache_zone;			/* zone of cached block */
47 	unsigned char *cache_data;	/* cached block data */
48 	long unsigned int cache_data_invalid_bitmap;
49 	bool cache_clean;
50 	struct work_struct flush_work;
51 	struct timer_list timer;
52 
53 	/* Geometry stuff */
54 	int heads;
55 	int sectors;
56 	int cylinders;
57 
58 	struct attribute_group *disk_attributes;
59 };
60 
61 struct chs_entry {
62 	unsigned long size;
63 	unsigned short cyl;
64 	unsigned char head;
65 	unsigned char sec;
66 };
67 
68 
69 #define SM_FTL_PARTN_BITS	3
70 
71 #define sm_printk(format, ...) \
72 	printk(KERN_WARNING "sm_ftl" ": " format "\n", ## __VA_ARGS__)
73 
74 #define dbg(format, ...) \
75 	if (debug) \
76 		printk(KERN_DEBUG "sm_ftl" ": " format "\n", ## __VA_ARGS__)
77 
78 #define dbg_verbose(format, ...) \
79 	if (debug > 1) \
80 		printk(KERN_DEBUG "sm_ftl" ": " format "\n", ## __VA_ARGS__)
81 
82 
83 static int sm_erase_block(struct sm_ftl *ftl, int zone_num, uint16_t block,
84 								int put_free);
85 static void sm_mark_block_bad(struct sm_ftl *ftl, int zone_num, int block);
86 
87 static int sm_recheck_media(struct sm_ftl *ftl);
88