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git.proxmox.com Git - mirror_ubuntu-artful-kernel.git/blob - drivers/mtd/devices/mtdram.c
2 * mtdram - a test mtd device
3 * Author: Alexander Larsson <alex@cendio.se>
5 * Copyright (c) 1999 Alexander Larsson <alex@cendio.se>
6 * Copyright (c) 2005 Joern Engel <joern@wh.fh-wedel.de>
12 #include <linux/module.h>
13 #include <linux/slab.h>
14 #include <linux/ioport.h>
15 #include <linux/vmalloc.h>
16 #include <linux/init.h>
17 #include <linux/mtd/compatmac.h>
18 #include <linux/mtd/mtd.h>
19 #include <linux/mtd/mtdram.h>
21 static unsigned long total_size
= CONFIG_MTDRAM_TOTAL_SIZE
;
22 static unsigned long erase_size
= CONFIG_MTDRAM_ERASE_SIZE
;
23 #define MTDRAM_TOTAL_SIZE (total_size * 1024)
24 #define MTDRAM_ERASE_SIZE (erase_size * 1024)
27 module_param(total_size
, ulong
, 0);
28 MODULE_PARM_DESC(total_size
, "Total device size in KiB");
29 module_param(erase_size
, ulong
, 0);
30 MODULE_PARM_DESC(erase_size
, "Device erase block size in KiB");
33 // We could store these in the mtd structure, but we only support 1 device..
34 static struct mtd_info
*mtd_info
;
36 static int ram_erase(struct mtd_info
*mtd
, struct erase_info
*instr
)
38 if (instr
->addr
+ instr
->len
> mtd
->size
)
41 memset((char *)mtd
->priv
+ instr
->addr
, 0xff, instr
->len
);
43 instr
->state
= MTD_ERASE_DONE
;
44 mtd_erase_callback(instr
);
49 static int ram_point(struct mtd_info
*mtd
, loff_t from
, size_t len
,
50 size_t *retlen
, void **virt
, resource_size_t
*phys
)
52 if (from
+ len
> mtd
->size
)
55 /* can we return a physical address with this driver? */
59 *virt
= mtd
->priv
+ from
;
64 static void ram_unpoint(struct mtd_info
*mtd
, loff_t from
, size_t len
)
68 static int ram_read(struct mtd_info
*mtd
, loff_t from
, size_t len
,
69 size_t *retlen
, u_char
*buf
)
71 if (from
+ len
> mtd
->size
)
74 memcpy(buf
, mtd
->priv
+ from
, len
);
80 static int ram_write(struct mtd_info
*mtd
, loff_t to
, size_t len
,
81 size_t *retlen
, const u_char
*buf
)
83 if (to
+ len
> mtd
->size
)
86 memcpy((char *)mtd
->priv
+ to
, buf
, len
);
92 static void __exit
cleanup_mtdram(void)
95 del_mtd_device(mtd_info
);
96 vfree(mtd_info
->priv
);
101 int mtdram_init_device(struct mtd_info
*mtd
, void *mapped_address
,
102 unsigned long size
, char *name
)
104 memset(mtd
, 0, sizeof(*mtd
));
106 /* Setup the MTD structure */
109 mtd
->flags
= MTD_CAP_RAM
;
112 mtd
->erasesize
= MTDRAM_ERASE_SIZE
;
113 mtd
->priv
= mapped_address
;
115 mtd
->owner
= THIS_MODULE
;
116 mtd
->erase
= ram_erase
;
117 mtd
->point
= ram_point
;
118 mtd
->unpoint
= ram_unpoint
;
119 mtd
->read
= ram_read
;
120 mtd
->write
= ram_write
;
122 if (add_mtd_device(mtd
)) {
129 static int __init
init_mtdram(void)
137 /* Allocate some memory */
138 mtd_info
= kmalloc(sizeof(struct mtd_info
), GFP_KERNEL
);
142 addr
= vmalloc(MTDRAM_TOTAL_SIZE
);
148 err
= mtdram_init_device(mtd_info
, addr
, MTDRAM_TOTAL_SIZE
, "mtdram test device");
155 memset(mtd_info
->priv
, 0xff, MTDRAM_TOTAL_SIZE
);
159 module_init(init_mtdram
);
160 module_exit(cleanup_mtdram
);
162 MODULE_LICENSE("GPL");
163 MODULE_AUTHOR("Alexander Larsson <alexl@redhat.com>");
164 MODULE_DESCRIPTION("Simulated MTD driver for testing");