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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> | |
4e57b681 TS |
30 | #include <linux/slab.h> |
31 | ||
1da177e4 LT |
32 | #include <linux/mtd/mtd.h> |
33 | #include <linux/mtd/map.h> | |
34 | #include <linux/mtd/partitions.h> | |
35 | ||
4e57b681 | 36 | #include <asm/io.h> |
1da177e4 | 37 | #include <asm/hardware.h> |
4e57b681 | 38 | |
1da177e4 LT |
39 | #ifdef CONFIG_EPXA10DB |
40 | #define BOARD_NAME "EPXA10DB" | |
41 | #else | |
42 | #define BOARD_NAME "EPXA1DB" | |
43 | #endif | |
44 | ||
45 | static int nr_parts = 0; | |
46 | static struct mtd_partition *parts; | |
47 | ||
48 | static struct mtd_info *mymtd; | |
49 | ||
50 | static int epxa_default_partitions(struct mtd_info *master, struct mtd_partition **pparts); | |
51 | ||
52 | ||
53 | static struct map_info epxa_map = { | |
54 | .name = "EPXA flash", | |
55 | .size = FLASH_SIZE, | |
56 | .bankwidth = 2, | |
57 | .phys = FLASH_START, | |
58 | }; | |
59 | ||
60 | static const char *probes[] = { "RedBoot", "afs", NULL }; | |
61 | ||
62 | static int __init epxa_mtd_init(void) | |
63 | { | |
64 | int i; | |
65 | ||
66 | printk(KERN_NOTICE "%s flash device: 0x%x at 0x%x\n", BOARD_NAME, FLASH_SIZE, FLASH_START); | |
67 | ||
68 | epxa_map.virt = ioremap(FLASH_START, FLASH_SIZE); | |
69 | if (!epxa_map.virt) { | |
70 | printk("Failed to ioremap %s flash\n",BOARD_NAME); | |
71 | return -EIO; | |
72 | } | |
73 | simple_map_init(&epxa_map); | |
74 | ||
75 | mymtd = do_map_probe("cfi_probe", &epxa_map); | |
76 | if (!mymtd) { | |
77 | iounmap((void *)epxa_map.virt); | |
78 | return -ENXIO; | |
79 | } | |
80 | ||
81 | mymtd->owner = THIS_MODULE; | |
82 | ||
83 | /* Unlock the flash device. */ | |
84 | if(mymtd->unlock){ | |
85 | for (i=0; i<mymtd->numeraseregions;i++){ | |
86 | int j; | |
87 | for(j=0;j<mymtd->eraseregions[i].numblocks;j++){ | |
88 | mymtd->unlock(mymtd,mymtd->eraseregions[i].offset + j * mymtd->eraseregions[i].erasesize,mymtd->eraseregions[i].erasesize); | |
89 | } | |
90 | } | |
91 | } | |
92 | ||
93 | #ifdef CONFIG_MTD_PARTITIONS | |
94 | nr_parts = parse_mtd_partitions(mymtd, probes, &parts, 0); | |
95 | ||
96 | if (nr_parts > 0) { | |
97 | add_mtd_partitions(mymtd, parts, nr_parts); | |
98 | return 0; | |
99 | } | |
100 | #endif | |
101 | /* No recognised partitioning schemes found - use defaults */ | |
102 | nr_parts = epxa_default_partitions(mymtd, &parts); | |
103 | if (nr_parts > 0) { | |
104 | add_mtd_partitions(mymtd, parts, nr_parts); | |
105 | return 0; | |
106 | } | |
107 | ||
108 | /* If all else fails... */ | |
109 | add_mtd_device(mymtd); | |
110 | return 0; | |
111 | } | |
112 | ||
113 | static void __exit epxa_mtd_cleanup(void) | |
114 | { | |
115 | if (mymtd) { | |
116 | if (nr_parts) | |
117 | del_mtd_partitions(mymtd); | |
118 | else | |
119 | del_mtd_device(mymtd); | |
120 | map_destroy(mymtd); | |
121 | } | |
122 | if (epxa_map.virt) { | |
123 | iounmap((void *)epxa_map.virt); | |
124 | epxa_map.virt = 0; | |
125 | } | |
126 | } | |
127 | ||
128 | ||
129 | /* | |
130 | * This will do for now, once we decide which bootldr we're finally | |
131 | * going to use then we'll remove this function and do it properly | |
132 | * | |
133 | * Partions are currently (as offsets from base of flash): | |
134 | * 0x00000000 - 0x003FFFFF - bootloader (!) | |
135 | * 0x00400000 - 0x00FFFFFF - Flashdisk | |
136 | */ | |
137 | ||
138 | static int __init epxa_default_partitions(struct mtd_info *master, struct mtd_partition **pparts) | |
139 | { | |
140 | struct mtd_partition *parts; | |
141 | int ret, i; | |
142 | int npartitions = 0; | |
143 | char *names; | |
144 | const char *name = "jffs"; | |
145 | ||
146 | printk("Using default partitions for %s\n",BOARD_NAME); | |
147 | npartitions=1; | |
148 | parts = kmalloc(npartitions*sizeof(*parts)+strlen(name), GFP_KERNEL); | |
149 | memzero(parts,npartitions*sizeof(*parts)+strlen(name)); | |
150 | if (!parts) { | |
151 | ret = -ENOMEM; | |
152 | goto out; | |
153 | } | |
154 | i=0; | |
155 | names = (char *)&parts[npartitions]; | |
156 | parts[i].name = names; | |
157 | names += strlen(name) + 1; | |
158 | strcpy(parts[i].name, name); | |
159 | ||
160 | #ifdef CONFIG_EPXA10DB | |
161 | parts[i].size = FLASH_SIZE-0x00400000; | |
162 | parts[i].offset = 0x00400000; | |
163 | #else | |
164 | parts[i].size = FLASH_SIZE-0x00180000; | |
165 | parts[i].offset = 0x00180000; | |
166 | #endif | |
167 | ||
168 | out: | |
169 | *pparts = parts; | |
170 | return npartitions; | |
171 | } | |
172 | ||
173 | ||
174 | module_init(epxa_mtd_init); | |
175 | module_exit(epxa_mtd_cleanup); | |
176 | ||
177 | MODULE_AUTHOR("Clive Davies"); | |
178 | MODULE_DESCRIPTION("Altera epxa mtd flash map"); | |
179 | MODULE_LICENSE("GPL"); |