fix maxcpus=1 oops in show_stat()
[linux-2.6.git] / drivers / mtd / maps / mainstone-flash.c
1 /*
2  * $Id:  $
3  *
4  * Map driver for the Mainstone developer platform.
5  *
6  * Author:      Nicolas Pitre
7  * Copyright:   (C) 2001 MontaVista Software Inc.
8  *
9  * This program is free software; you can redistribute it and/or modify
10  * it under the terms of the GNU General Public License version 2 as
11  * published by the Free Software Foundation.
12  */
13
14 #include <linux/module.h>
15 #include <linux/types.h>
16 #include <linux/kernel.h>
17 #include <linux/init.h>
18 #include <linux/dma-mapping.h>
19 #include <linux/slab.h>
20
21 #include <linux/mtd/mtd.h>
22 #include <linux/mtd/map.h>
23 #include <linux/mtd/partitions.h>
24
25 #include <asm/io.h>
26 #include <asm/hardware.h>
27 #include <asm/arch/pxa-regs.h>
28 #include <asm/arch/mainstone.h>
29
30
31 #define ROM_ADDR        0x00000000
32 #define FLASH_ADDR      0x04000000
33
34 #define WINDOW_SIZE     0x04000000
35
36 static void mainstone_map_inval_cache(struct map_info *map, unsigned long from,
37                                       ssize_t len)
38 {
39         consistent_sync((char *)map->cached + from, len, DMA_FROM_DEVICE);
40 }
41
42 static struct map_info mainstone_maps[2] = { {
43         .size =         WINDOW_SIZE,
44         .phys =         PXA_CS0_PHYS,
45         .inval_cache =  mainstone_map_inval_cache,
46 }, {
47         .size =         WINDOW_SIZE,
48         .phys =         PXA_CS1_PHYS,
49         .inval_cache =  mainstone_map_inval_cache,
50 } };
51
52 static struct mtd_partition mainstone_partitions[] = {
53         {
54                 .name =         "Bootloader",
55                 .size =         0x00040000,
56                 .offset =       0,
57                 .mask_flags =   MTD_WRITEABLE  /* force read-only */
58         },{
59                 .name =         "Kernel",
60                 .size =         0x00400000,
61                 .offset =       0x00040000,
62         },{
63                 .name =         "Filesystem",
64                 .size =         MTDPART_SIZ_FULL,
65                 .offset =       0x00440000
66         }
67 };
68
69 static struct mtd_info *mymtds[2];
70 static struct mtd_partition *parsed_parts[2];
71 static int nr_parsed_parts[2];
72
73 static const char *probes[] = { "RedBoot", "cmdlinepart", NULL };
74
75 static int __init init_mainstone(void)
76 {
77         int SW7 = 0;  /* FIXME: get from SCR (Mst doc section 3.2.1.1) */
78         int ret = 0, i;
79
80         mainstone_maps[0].bankwidth = (BOOT_DEF & 1) ? 2 : 4;
81         mainstone_maps[1].bankwidth = 4;
82
83         /* Compensate for SW7 which swaps the flash banks */
84         mainstone_maps[SW7].name = "processor flash";
85         mainstone_maps[SW7 ^ 1].name = "main board flash";
86
87         printk(KERN_NOTICE "Mainstone configured to boot from %s\n",
88                mainstone_maps[0].name);
89
90         for (i = 0; i < 2; i++) {
91                 mainstone_maps[i].virt = ioremap(mainstone_maps[i].phys,
92                                                  WINDOW_SIZE);
93                 if (!mainstone_maps[i].virt) {
94                         printk(KERN_WARNING "Failed to ioremap %s\n",
95                                mainstone_maps[i].name);
96                         if (!ret)
97                                 ret = -ENOMEM;
98                         continue;
99                 }
100                 mainstone_maps[i].cached =
101                         ioremap_cached(mainstone_maps[i].phys, WINDOW_SIZE);
102                 if (!mainstone_maps[i].cached)
103                         printk(KERN_WARNING "Failed to ioremap cached %s\n",
104                                mainstone_maps[i].name);
105                 simple_map_init(&mainstone_maps[i]);
106
107                 printk(KERN_NOTICE
108                        "Probing %s at physical address 0x%08lx"
109                        " (%d-bit bankwidth)\n",
110                        mainstone_maps[i].name, mainstone_maps[i].phys,
111                        mainstone_maps[i].bankwidth * 8);
112
113                 mymtds[i] = do_map_probe("cfi_probe", &mainstone_maps[i]);
114
115                 if (!mymtds[i]) {
116                         iounmap((void *)mainstone_maps[i].virt);
117                         if (mainstone_maps[i].cached)
118                                 iounmap(mainstone_maps[i].cached);
119                         if (!ret)
120                                 ret = -EIO;
121                         continue;
122                 }
123                 mymtds[i]->owner = THIS_MODULE;
124
125                 ret = parse_mtd_partitions(mymtds[i], probes,
126                                            &parsed_parts[i], 0);
127
128                 if (ret > 0)
129                         nr_parsed_parts[i] = ret;
130         }
131
132         if (!mymtds[0] && !mymtds[1])
133                 return ret;
134
135         for (i = 0; i < 2; i++) {
136                 if (!mymtds[i]) {
137                         printk(KERN_WARNING "%s is absent. Skipping\n",
138                                mainstone_maps[i].name);
139                 } else if (nr_parsed_parts[i]) {
140                         add_mtd_partitions(mymtds[i], parsed_parts[i],
141                                            nr_parsed_parts[i]);
142                 } else if (!i) {
143                         printk("Using static partitions on %s\n",
144                                mainstone_maps[i].name);
145                         add_mtd_partitions(mymtds[i], mainstone_partitions,
146                                            ARRAY_SIZE(mainstone_partitions));
147                 } else {
148                         printk("Registering %s as whole device\n",
149                                mainstone_maps[i].name);
150                         add_mtd_device(mymtds[i]);
151                 }
152         }
153         return 0;
154 }
155
156 static void __exit cleanup_mainstone(void)
157 {
158         int i;
159         for (i = 0; i < 2; i++) {
160                 if (!mymtds[i])
161                         continue;
162
163                 if (nr_parsed_parts[i] || !i)
164                         del_mtd_partitions(mymtds[i]);
165                 else
166                         del_mtd_device(mymtds[i]);
167
168                 map_destroy(mymtds[i]);
169                 iounmap((void *)mainstone_maps[i].virt);
170                 if (mainstone_maps[i].cached)
171                         iounmap(mainstone_maps[i].cached);
172                 kfree(parsed_parts[i]);
173         }
174 }
175
176 module_init(init_mainstone);
177 module_exit(cleanup_mainstone);
178
179 MODULE_LICENSE("GPL");
180 MODULE_AUTHOR("Nicolas Pitre <nico@cam.org>");
181 MODULE_DESCRIPTION("MTD map driver for Intel Mainstone");