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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * mtdram - a test mtd device
Joern Engelc13cbf32005-04-21 04:42:15 +01003 * $Id: mtdram.c,v 1.37 2005/04/21 03:42:11 joern Exp $
Linus Torvalds1da177e2005-04-16 15:20:36 -07004 * Author: Alexander Larsson <alex@cendio.se>
5 *
6 * Copyright (c) 1999 Alexander Larsson <alex@cendio.se>
Joern Engelc13cbf32005-04-21 04:42:15 +01007 * Copyright (c) 2005 Joern Engel <joern@wh.fh-wedel.de>
Linus Torvalds1da177e2005-04-16 15:20:36 -07008 *
9 * This code is GPL
10 *
11 */
12
Linus Torvalds1da177e2005-04-16 15:20:36 -070013#include <linux/module.h>
14#include <linux/slab.h>
15#include <linux/ioport.h>
16#include <linux/vmalloc.h>
17#include <linux/init.h>
18#include <linux/mtd/compatmac.h>
19#include <linux/mtd/mtd.h>
20
Linus Torvalds1da177e2005-04-16 15:20:36 -070021static unsigned long total_size = CONFIG_MTDRAM_TOTAL_SIZE;
22static unsigned long erase_size = CONFIG_MTDRAM_ERASE_SIZE;
Linus Torvalds1da177e2005-04-16 15:20:36 -070023#define MTDRAM_TOTAL_SIZE (total_size * 1024)
24#define MTDRAM_ERASE_SIZE (erase_size * 1024)
Linus Torvalds1da177e2005-04-16 15:20:36 -070025
Joern Engelc13cbf32005-04-21 04:42:15 +010026#ifdef MODULE
27module_param(total_size, ulong, 0);
28MODULE_PARM_DESC(total_size, "Total device size in KiB");
29module_param(erase_size, ulong, 0);
30MODULE_PARM_DESC(erase_size, "Device erase block size in KiB");
31#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -070032
33// We could store these in the mtd structure, but we only support 1 device..
34static struct mtd_info *mtd_info;
35
Joern Engelc13cbf32005-04-21 04:42:15 +010036static int ram_erase(struct mtd_info *mtd, struct erase_info *instr)
Linus Torvalds1da177e2005-04-16 15:20:36 -070037{
Joern Engelc13cbf32005-04-21 04:42:15 +010038 if (instr->addr + instr->len > mtd->size)
39 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -070040
Joern Engelc13cbf32005-04-21 04:42:15 +010041 memset((char *)mtd->priv + instr->addr, 0xff, instr->len);
42
43 instr->state = MTD_ERASE_DONE;
44 mtd_erase_callback(instr);
45
46 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -070047}
48
Joern Engelc13cbf32005-04-21 04:42:15 +010049static int ram_point(struct mtd_info *mtd, loff_t from, size_t len,
50 size_t *retlen, u_char **mtdbuf)
Linus Torvalds1da177e2005-04-16 15:20:36 -070051{
Joern Engelc13cbf32005-04-21 04:42:15 +010052 if (from + len > mtd->size)
53 return -EINVAL;
54
55 *mtdbuf = mtd->priv + from;
56 *retlen = len;
57 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -070058}
59
Joern Engelc13cbf32005-04-21 04:42:15 +010060static void ram_unpoint(struct mtd_info *mtd, u_char * addr, loff_t from,
61 size_t len)
Linus Torvalds1da177e2005-04-16 15:20:36 -070062{
Linus Torvalds1da177e2005-04-16 15:20:36 -070063}
64
65static int ram_read(struct mtd_info *mtd, loff_t from, size_t len,
Joern Engelc13cbf32005-04-21 04:42:15 +010066 size_t *retlen, u_char *buf)
Linus Torvalds1da177e2005-04-16 15:20:36 -070067{
Joern Engelc13cbf32005-04-21 04:42:15 +010068 if (from + len > mtd->size)
69 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -070070
Joern Engelc13cbf32005-04-21 04:42:15 +010071 memcpy(buf, mtd->priv + from, len);
Linus Torvalds1da177e2005-04-16 15:20:36 -070072
Joern Engelc13cbf32005-04-21 04:42:15 +010073 *retlen = len;
74 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -070075}
76
77static int ram_write(struct mtd_info *mtd, loff_t to, size_t len,
Joern Engelc13cbf32005-04-21 04:42:15 +010078 size_t *retlen, const u_char *buf)
Linus Torvalds1da177e2005-04-16 15:20:36 -070079{
Joern Engelc13cbf32005-04-21 04:42:15 +010080 if (to + len > mtd->size)
81 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -070082
Joern Engelc13cbf32005-04-21 04:42:15 +010083 memcpy((char *)mtd->priv + to, buf, len);
Linus Torvalds1da177e2005-04-16 15:20:36 -070084
Joern Engelc13cbf32005-04-21 04:42:15 +010085 *retlen = len;
86 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -070087}
88
89static void __exit cleanup_mtdram(void)
90{
Joern Engelc13cbf32005-04-21 04:42:15 +010091 if (mtd_info) {
92 del_mtd_device(mtd_info);
Jesper Juhlf91012102005-09-10 00:26:54 -070093 vfree(mtd_info->priv);
Joern Engelc13cbf32005-04-21 04:42:15 +010094 kfree(mtd_info);
95 }
Linus Torvalds1da177e2005-04-16 15:20:36 -070096}
97
Joern Engelc13cbf32005-04-21 04:42:15 +010098int mtdram_init_device(struct mtd_info *mtd, void *mapped_address,
99 unsigned long size, char *name)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700100{
Joern Engelc13cbf32005-04-21 04:42:15 +0100101 memset(mtd, 0, sizeof(*mtd));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700102
Joern Engelc13cbf32005-04-21 04:42:15 +0100103 /* Setup the MTD structure */
104 mtd->name = name;
David Woodhouse21c8db92006-06-14 21:39:48 +0100105 mtd->type = MTD_RAM;
Joern Engelc13cbf32005-04-21 04:42:15 +0100106 mtd->flags = MTD_CAP_RAM;
107 mtd->size = size;
Artem B. Bityutskiy783ed812006-06-14 19:53:44 +0400108 mtd->writesize = 1;
Joern Engelc13cbf32005-04-21 04:42:15 +0100109 mtd->erasesize = MTDRAM_ERASE_SIZE;
110 mtd->priv = mapped_address;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700111
Joern Engelc13cbf32005-04-21 04:42:15 +0100112 mtd->owner = THIS_MODULE;
113 mtd->erase = ram_erase;
114 mtd->point = ram_point;
115 mtd->unpoint = ram_unpoint;
116 mtd->read = ram_read;
117 mtd->write = ram_write;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700118
Joern Engelc13cbf32005-04-21 04:42:15 +0100119 if (add_mtd_device(mtd)) {
120 return -EIO;
121 }
122
123 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700124}
125
Linus Torvalds1da177e2005-04-16 15:20:36 -0700126static int __init init_mtdram(void)
127{
Joern Engelc13cbf32005-04-21 04:42:15 +0100128 void *addr;
129 int err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700130
Joern Engelc13cbf32005-04-21 04:42:15 +0100131 if (!total_size)
132 return -EINVAL;
133
134 /* Allocate some memory */
135 mtd_info = kmalloc(sizeof(struct mtd_info), GFP_KERNEL);
136 if (!mtd_info)
137 return -ENOMEM;
138
139 addr = vmalloc(MTDRAM_TOTAL_SIZE);
140 if (!addr) {
141 kfree(mtd_info);
142 mtd_info = NULL;
143 return -ENOMEM;
144 }
145 err = mtdram_init_device(mtd_info, addr, MTDRAM_TOTAL_SIZE, "mtdram test device");
146 if (err) {
147 vfree(addr);
148 kfree(mtd_info);
149 mtd_info = NULL;
150 return err;
151 }
152 memset(mtd_info->priv, 0xff, MTDRAM_TOTAL_SIZE);
153 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700154}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700155
156module_init(init_mtdram);
157module_exit(cleanup_mtdram);
158
159MODULE_LICENSE("GPL");
160MODULE_AUTHOR("Alexander Larsson <alexl@redhat.com>");
161MODULE_DESCRIPTION("Simulated MTD driver for testing");