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1da177e4 LT |
1 | /* |
2 | * Flash memory access on EPXA based devices | |
3 | * | |
4 | * (C) 2000 Nicolas Pitre <nico@cam.org> | |
5 | * Copyright (C) 2001 Altera Corporation | |
6 | * Copyright (C) 2001 Red Hat, Inc. | |
7 | * | |
8 | * $Id: epxa10db-flash.c,v 1.13 2004/11/04 13:24:14 gleixner Exp $ | |
9 | * | |
10 | * This program is free software; you can redistribute it and/or modify | |
11 | * it under the terms of the GNU General Public License as published by | |
12 | * the Free Software Foundation; either version 2 of the License, or | |
13 | * (at your option) any later version. | |
14 | * | |
15 | * This program is distributed in the hope that it will be useful, | |
16 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
17 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
18 | * GNU General Public License for more details. | |
19 | * | |
20 | * You should have received a copy of the GNU General Public License | |
21 | * along with this program; if not, write to the Free Software | |
22 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
23 | */ | |
24 | ||
25 | #include <linux/config.h> | |
26 | #include <linux/module.h> | |
27 | #include <linux/types.h> | |
28 | #include <linux/kernel.h> | |
29 | #include <linux/init.h> | |
30 | #include <asm/io.h> | |
31 | #include <linux/mtd/mtd.h> | |
32 | #include <linux/mtd/map.h> | |
33 | #include <linux/mtd/partitions.h> | |
34 | ||
35 | #include <asm/hardware.h> | |
36 | #ifdef CONFIG_EPXA10DB | |
37 | #define BOARD_NAME "EPXA10DB" | |
38 | #else | |
39 | #define BOARD_NAME "EPXA1DB" | |
40 | #endif | |
41 | ||
42 | static int nr_parts = 0; | |
43 | static struct mtd_partition *parts; | |
44 | ||
45 | static struct mtd_info *mymtd; | |
46 | ||
47 | static int epxa_default_partitions(struct mtd_info *master, struct mtd_partition **pparts); | |
48 | ||
49 | ||
50 | static struct map_info epxa_map = { | |
51 | .name = "EPXA flash", | |
52 | .size = FLASH_SIZE, | |
53 | .bankwidth = 2, | |
54 | .phys = FLASH_START, | |
55 | }; | |
56 | ||
57 | static const char *probes[] = { "RedBoot", "afs", NULL }; | |
58 | ||
59 | static int __init epxa_mtd_init(void) | |
60 | { | |
61 | int i; | |
62 | ||
63 | printk(KERN_NOTICE "%s flash device: 0x%x at 0x%x\n", BOARD_NAME, FLASH_SIZE, FLASH_START); | |
64 | ||
65 | epxa_map.virt = ioremap(FLASH_START, FLASH_SIZE); | |
66 | if (!epxa_map.virt) { | |
67 | printk("Failed to ioremap %s flash\n",BOARD_NAME); | |
68 | return -EIO; | |
69 | } | |
70 | simple_map_init(&epxa_map); | |
71 | ||
72 | mymtd = do_map_probe("cfi_probe", &epxa_map); | |
73 | if (!mymtd) { | |
74 | iounmap((void *)epxa_map.virt); | |
75 | return -ENXIO; | |
76 | } | |
77 | ||
78 | mymtd->owner = THIS_MODULE; | |
79 | ||
80 | /* Unlock the flash device. */ | |
81 | if(mymtd->unlock){ | |
82 | for (i=0; i<mymtd->numeraseregions;i++){ | |
83 | int j; | |
84 | for(j=0;j<mymtd->eraseregions[i].numblocks;j++){ | |
85 | mymtd->unlock(mymtd,mymtd->eraseregions[i].offset + j * mymtd->eraseregions[i].erasesize,mymtd->eraseregions[i].erasesize); | |
86 | } | |
87 | } | |
88 | } | |
89 | ||
90 | #ifdef CONFIG_MTD_PARTITIONS | |
91 | nr_parts = parse_mtd_partitions(mymtd, probes, &parts, 0); | |
92 | ||
93 | if (nr_parts > 0) { | |
94 | add_mtd_partitions(mymtd, parts, nr_parts); | |
95 | return 0; | |
96 | } | |
97 | #endif | |
98 | /* No recognised partitioning schemes found - use defaults */ | |
99 | nr_parts = epxa_default_partitions(mymtd, &parts); | |
100 | if (nr_parts > 0) { | |
101 | add_mtd_partitions(mymtd, parts, nr_parts); | |
102 | return 0; | |
103 | } | |
104 | ||
105 | /* If all else fails... */ | |
106 | add_mtd_device(mymtd); | |
107 | return 0; | |
108 | } | |
109 | ||
110 | static void __exit epxa_mtd_cleanup(void) | |
111 | { | |
112 | if (mymtd) { | |
113 | if (nr_parts) | |
114 | del_mtd_partitions(mymtd); | |
115 | else | |
116 | del_mtd_device(mymtd); | |
117 | map_destroy(mymtd); | |
118 | } | |
119 | if (epxa_map.virt) { | |
120 | iounmap((void *)epxa_map.virt); | |
121 | epxa_map.virt = 0; | |
122 | } | |
123 | } | |
124 | ||
125 | ||
126 | /* | |
127 | * This will do for now, once we decide which bootldr we're finally | |
128 | * going to use then we'll remove this function and do it properly | |
129 | * | |
130 | * Partions are currently (as offsets from base of flash): | |
131 | * 0x00000000 - 0x003FFFFF - bootloader (!) | |
132 | * 0x00400000 - 0x00FFFFFF - Flashdisk | |
133 | */ | |
134 | ||
135 | static int __init epxa_default_partitions(struct mtd_info *master, struct mtd_partition **pparts) | |
136 | { | |
137 | struct mtd_partition *parts; | |
138 | int ret, i; | |
139 | int npartitions = 0; | |
140 | char *names; | |
141 | const char *name = "jffs"; | |
142 | ||
143 | printk("Using default partitions for %s\n",BOARD_NAME); | |
144 | npartitions=1; | |
145 | parts = kmalloc(npartitions*sizeof(*parts)+strlen(name), GFP_KERNEL); | |
146 | memzero(parts,npartitions*sizeof(*parts)+strlen(name)); | |
147 | if (!parts) { | |
148 | ret = -ENOMEM; | |
149 | goto out; | |
150 | } | |
151 | i=0; | |
152 | names = (char *)&parts[npartitions]; | |
153 | parts[i].name = names; | |
154 | names += strlen(name) + 1; | |
155 | strcpy(parts[i].name, name); | |
156 | ||
157 | #ifdef CONFIG_EPXA10DB | |
158 | parts[i].size = FLASH_SIZE-0x00400000; | |
159 | parts[i].offset = 0x00400000; | |
160 | #else | |
161 | parts[i].size = FLASH_SIZE-0x00180000; | |
162 | parts[i].offset = 0x00180000; | |
163 | #endif | |
164 | ||
165 | out: | |
166 | *pparts = parts; | |
167 | return npartitions; | |
168 | } | |
169 | ||
170 | ||
171 | module_init(epxa_mtd_init); | |
172 | module_exit(epxa_mtd_cleanup); | |
173 | ||
174 | MODULE_AUTHOR("Clive Davies"); | |
175 | MODULE_DESCRIPTION("Altera epxa mtd flash map"); | |
176 | MODULE_LICENSE("GPL"); |