Merge rsync://bughost.org/repos/ieee80211-delta/
[linux-2.6] / drivers / mtd / maps / wr_sbc82xx_flash.c
1 /*
2  * $Id: wr_sbc82xx_flash.c,v 1.8 2005/11/07 11:14:29 gleixner Exp $
3  *
4  * Map for flash chips on Wind River PowerQUICC II SBC82xx board.
5  *
6  * Copyright (C) 2004 Red Hat, Inc.
7  *
8  * Author: David Woodhouse <dwmw2@infradead.org>
9  *
10  */
11
12 #include <linux/module.h>
13 #include <linux/types.h>
14 #include <linux/kernel.h>
15 #include <linux/init.h>
16 #include <linux/slab.h>
17 #include <asm/io.h>
18 #include <linux/mtd/mtd.h>
19 #include <linux/mtd/map.h>
20 #include <linux/config.h>
21 #include <linux/mtd/partitions.h>
22
23 #include <asm/immap_cpm2.h>
24
25 static struct mtd_info *sbcmtd[3];
26 static struct mtd_partition *sbcmtd_parts[3];
27
28 struct map_info sbc82xx_flash_map[3] = {
29         {.name = "Boot flash"},
30         {.name = "Alternate boot flash"},
31         {.name = "User flash"}
32 };
33
34 static struct mtd_partition smallflash_parts[] = {
35         {
36                 .name =         "space",
37                 .size =         0x100000,
38                 .offset =       0,
39         }, {
40                 .name =         "bootloader",
41                 .size =         MTDPART_SIZ_FULL,
42                 .offset =       MTDPART_OFS_APPEND,
43         }
44 };
45
46 static struct mtd_partition bigflash_parts[] = {
47         {
48                 .name =         "bootloader",
49                 .size =         0x00100000,
50                 .offset =       0,
51         }, {
52                 .name =         "file system",
53                 .size =         0x01f00000,
54                 .offset =       MTDPART_OFS_APPEND,
55         }, {
56                 .name =         "boot config",
57                 .size =         0x00100000,
58                 .offset =       MTDPART_OFS_APPEND,
59         }, {
60                 .name =         "space",
61                 .size =         0x01f00000,
62                 .offset =       MTDPART_OFS_APPEND,
63         }
64 };
65
66 static const char *part_probes[] __initdata = {"cmdlinepart", "RedBoot", NULL};
67
68 #define init_sbc82xx_one_flash(map, br, or)                     \
69 do {                                                            \
70         (map).phys = (br & 1) ? (br & 0xffff8000) : 0;          \
71         (map).size = (br & 1) ? (~(or & 0xffff8000) + 1) : 0;   \
72         switch (br & 0x00001800) {                              \
73         case 0x00000000:                                        \
74         case 0x00000800:        (map).bankwidth = 1;    break;  \
75         case 0x00001000:        (map).bankwidth = 2;    break;  \
76         case 0x00001800:        (map).bankwidth = 4;    break;  \
77         }                                                       \
78 } while (0);
79
80 int __init init_sbc82xx_flash(void)
81 {
82         volatile memctl_cpm2_t *mc = &cpm2_immr->im_memctl;
83         int bigflash;
84         int i;
85
86 #ifdef CONFIG_SBC8560
87         mc = ioremap(0xff700000 + 0x5000, sizeof(memctl_cpm2_t));
88 #else
89         mc = &cpm2_immr->im_memctl;
90 #endif
91
92         bigflash = 1;
93         if ((mc->memc_br0 & 0x00001800) == 0x00001800)
94                 bigflash = 0;
95
96         init_sbc82xx_one_flash(sbc82xx_flash_map[0], mc->memc_br0, mc->memc_or0);
97         init_sbc82xx_one_flash(sbc82xx_flash_map[1], mc->memc_br6, mc->memc_or6);
98         init_sbc82xx_one_flash(sbc82xx_flash_map[2], mc->memc_br1, mc->memc_or1);
99
100 #ifdef CONFIG_SBC8560
101         iounmap((void *) mc);
102 #endif
103
104         for (i=0; i<3; i++) {
105                 int8_t flashcs[3] = { 0, 6, 1 };
106                 int nr_parts;
107
108                 printk(KERN_NOTICE "PowerQUICC II %s (%ld MiB on CS%d",
109                        sbc82xx_flash_map[i].name,
110                        (sbc82xx_flash_map[i].size >> 20),
111                        flashcs[i]);
112                 if (!sbc82xx_flash_map[i].phys) {
113                         /* We know it can't be at zero. */
114                         printk("): disabled by bootloader.\n");
115                         continue;
116                 }
117                 printk(" at %08lx)\n",  sbc82xx_flash_map[i].phys);
118
119                 sbc82xx_flash_map[i].virt = ioremap(sbc82xx_flash_map[i].phys, sbc82xx_flash_map[i].size);
120
121                 if (!sbc82xx_flash_map[i].virt) {
122                         printk("Failed to ioremap\n");
123                         continue;
124                 }
125
126                 simple_map_init(&sbc82xx_flash_map[i]);
127
128                 sbcmtd[i] = do_map_probe("cfi_probe", &sbc82xx_flash_map[i]);
129
130                 if (!sbcmtd[i])
131                         continue;
132
133                 sbcmtd[i]->owner = THIS_MODULE;
134
135                 nr_parts = parse_mtd_partitions(sbcmtd[i], part_probes,
136                                                 &sbcmtd_parts[i], 0);
137                 if (nr_parts > 0) {
138                         add_mtd_partitions (sbcmtd[i], sbcmtd_parts[i], nr_parts);
139                         continue;
140                 }
141
142                 /* No partitioning detected. Use default */
143                 if (i == 2) {
144                         add_mtd_device(sbcmtd[i]);
145                 } else if (i == bigflash) {
146                         add_mtd_partitions (sbcmtd[i], bigflash_parts, ARRAY_SIZE(bigflash_parts));
147                 } else {
148                         add_mtd_partitions (sbcmtd[i], smallflash_parts, ARRAY_SIZE(smallflash_parts));
149                 }
150         }
151         return 0;
152 }
153
154 static void __exit cleanup_sbc82xx_flash(void)
155 {
156         int i;
157
158         for (i=0; i<3; i++) {
159                 if (!sbcmtd[i])
160                         continue;
161
162                 if (i<2 || sbcmtd_parts[i])
163                         del_mtd_partitions(sbcmtd[i]);
164                 else
165                         del_mtd_device(sbcmtd[i]);
166
167                 kfree(sbcmtd_parts[i]);
168                 map_destroy(sbcmtd[i]);
169
170                 iounmap((void *)sbc82xx_flash_map[i].virt);
171                 sbc82xx_flash_map[i].virt = 0;
172         }
173 }
174
175 module_init(init_sbc82xx_flash);
176 module_exit(cleanup_sbc82xx_flash);
177
178
179 MODULE_LICENSE("GPL");
180 MODULE_AUTHOR("David Woodhouse <dwmw2@infradead.org>");
181 MODULE_DESCRIPTION("Flash map driver for WindRiver PowerQUICC II");