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ts5500_flash.c
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1 /*
2  * ts5500_flash.c -- MTD map driver for Technology Systems TS-5500 board
3  *
4  * Copyright (C) 2004 Sean Young <[email protected]>
5  *
6  * This program is free software; you can redistribute it and/or modify
7  * it under the terms of the GNU General Public License as published by
8  * the Free Software Foundation; either version 2 of the License, or
9  * (at your option) any later version.
10  *
11  * This program is distributed in the hope that it will be useful,
12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14  * GNU General Public License for more details.
15  *
16  * You should have received a copy of the GNU General Public License
17  * along with this program; if not, write to the Free Software
18  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
19  *
20  * Note:
21  * - In order for detection to work, jumper 3 must be set.
22  * - Drive A and B use the resident flash disk (RFD) flash translation layer.
23  * - If you have created your own jffs file system and the bios overwrites
24  * it during boot, try disabling Drive A: and B: in the boot order.
25  */
26 
27 #include <linux/init.h>
28 #include <linux/module.h>
29 #include <linux/kernel.h>
30 #include <linux/mtd/map.h>
31 #include <linux/mtd/mtd.h>
32 #include <linux/mtd/partitions.h>
33 #include <linux/types.h>
34 
35 
36 #define WINDOW_ADDR 0x09400000
37 #define WINDOW_SIZE 0x00200000
38 
39 static struct map_info ts5500_map = {
40  .name = "TS-5500 Flash",
41  .size = WINDOW_SIZE,
42  .bankwidth = 1,
43  .phys = WINDOW_ADDR
44 };
45 
46 static struct mtd_partition ts5500_partitions[] = {
47  {
48  .name = "Drive A",
49  .offset = 0,
50  .size = 0x0e0000
51  },
52  {
53  .name = "BIOS",
54  .offset = 0x0e0000,
55  .size = 0x020000,
56  },
57  {
58  .name = "Drive B",
59  .offset = 0x100000,
60  .size = 0x100000
61  }
62 };
63 
64 #define NUM_PARTITIONS ARRAY_SIZE(ts5500_partitions)
65 
66 static struct mtd_info *mymtd;
67 
68 static int __init init_ts5500_map(void)
69 {
70  int rc = 0;
71 
72  ts5500_map.virt = ioremap_nocache(ts5500_map.phys, ts5500_map.size);
73 
74  if (!ts5500_map.virt) {
75  printk(KERN_ERR "Failed to ioremap_nocache\n");
76  rc = -EIO;
77  goto err2;
78  }
79 
80  simple_map_init(&ts5500_map);
81 
82  mymtd = do_map_probe("jedec_probe", &ts5500_map);
83  if (!mymtd)
84  mymtd = do_map_probe("map_rom", &ts5500_map);
85 
86  if (!mymtd) {
87  rc = -ENXIO;
88  goto err1;
89  }
90 
91  mymtd->owner = THIS_MODULE;
92  mtd_device_register(mymtd, ts5500_partitions, NUM_PARTITIONS);
93 
94  return 0;
95 
96 err1:
97  iounmap(ts5500_map.virt);
98 err2:
99  return rc;
100 }
101 
102 static void __exit cleanup_ts5500_map(void)
103 {
104  if (mymtd) {
105  mtd_device_unregister(mymtd);
106  map_destroy(mymtd);
107  }
108 
109  if (ts5500_map.virt) {
110  iounmap(ts5500_map.virt);
111  ts5500_map.virt = NULL;
112  }
113 }
114 
115 module_init(init_ts5500_map);
116 module_exit(cleanup_ts5500_map);
117 
118 MODULE_LICENSE("GPL");
119 MODULE_AUTHOR("Sean Young <[email protected]>");
120 MODULE_DESCRIPTION("MTD map driver for Techology Systems TS-5500 board");
121