Merge branch 'timers-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel...
[linux-2.6] / drivers / mtd / maps / solutionengine.c
1 /*
2  * Flash and EPROM on Hitachi Solution Engine and similar boards.
3  *
4  * (C) 2001 Red Hat, Inc.
5  *
6  * GPL'd
7  */
8
9 #include <linux/module.h>
10 #include <linux/types.h>
11 #include <linux/kernel.h>
12 #include <linux/init.h>
13 #include <asm/io.h>
14 #include <linux/mtd/mtd.h>
15 #include <linux/mtd/map.h>
16 #include <linux/mtd/partitions.h>
17 #include <linux/errno.h>
18
19 static struct mtd_info *flash_mtd;
20 static struct mtd_info *eprom_mtd;
21
22 static struct mtd_partition *parsed_parts;
23
24 struct map_info soleng_eprom_map = {
25         .name = "Solution Engine EPROM",
26         .size = 0x400000,
27         .bankwidth = 4,
28 };
29
30 struct map_info soleng_flash_map = {
31         .name = "Solution Engine FLASH",
32         .size = 0x400000,
33         .bankwidth = 4,
34 };
35
36 static const char *probes[] = { "RedBoot", "cmdlinepart", NULL };
37
38 #ifdef CONFIG_MTD_SUPERH_RESERVE
39 static struct mtd_partition superh_se_partitions[] = {
40         /* Reserved for boot code, read-only */
41         {
42                 .name = "flash_boot",
43                 .offset = 0x00000000,
44                 .size = CONFIG_MTD_SUPERH_RESERVE,
45                 .mask_flags = MTD_WRITEABLE,
46         },
47         /* All else is writable (e.g. JFFS) */
48         {
49                 .name = "Flash FS",
50                 .offset = MTDPART_OFS_NXTBLK,
51                 .size = MTDPART_SIZ_FULL,
52         }
53 };
54 #endif /* CONFIG_MTD_SUPERH_RESERVE */
55
56 static int __init init_soleng_maps(void)
57 {
58         int nr_parts = 0;
59
60         /* First probe at offset 0 */
61         soleng_flash_map.phys = 0;
62         soleng_flash_map.virt = (void __iomem *)P2SEGADDR(0);
63         soleng_eprom_map.phys = 0x01000000;
64         soleng_eprom_map.virt = (void __iomem *)P1SEGADDR(0x01000000);
65         simple_map_init(&soleng_eprom_map);
66         simple_map_init(&soleng_flash_map);
67
68         printk(KERN_NOTICE "Probing for flash chips at 0x00000000:\n");
69         flash_mtd = do_map_probe("cfi_probe", &soleng_flash_map);
70         if (!flash_mtd) {
71                 /* Not there. Try swapping */
72                 printk(KERN_NOTICE "Probing for flash chips at 0x01000000:\n");
73                 soleng_flash_map.phys = 0x01000000;
74                 soleng_flash_map.virt = P2SEGADDR(0x01000000);
75                 soleng_eprom_map.phys = 0;
76                 soleng_eprom_map.virt = P1SEGADDR(0);
77                 flash_mtd = do_map_probe("cfi_probe", &soleng_flash_map);
78                 if (!flash_mtd) {
79                         /* Eep. */
80                         printk(KERN_NOTICE "Flash chips not detected at either possible location.\n");
81                         return -ENXIO;
82                 }
83         }
84         printk(KERN_NOTICE "Solution Engine: Flash at 0x%08lx, EPROM at 0x%08lx\n",
85                soleng_flash_map.phys & 0x1fffffff,
86                soleng_eprom_map.phys & 0x1fffffff);
87         flash_mtd->owner = THIS_MODULE;
88
89         eprom_mtd = do_map_probe("map_rom", &soleng_eprom_map);
90         if (eprom_mtd) {
91                 eprom_mtd->owner = THIS_MODULE;
92                 add_mtd_device(eprom_mtd);
93         }
94
95         nr_parts = parse_mtd_partitions(flash_mtd, probes, &parsed_parts, 0);
96
97 #ifdef CONFIG_MTD_SUPERH_RESERVE
98         if (nr_parts <= 0) {
99                 printk(KERN_NOTICE "Using configured partition at 0x%08x.\n",
100                        CONFIG_MTD_SUPERH_RESERVE);
101                 parsed_parts = superh_se_partitions;
102                 nr_parts = sizeof(superh_se_partitions)/sizeof(*parsed_parts);
103         }
104 #endif /* CONFIG_MTD_SUPERH_RESERVE */
105
106         if (nr_parts > 0)
107                 add_mtd_partitions(flash_mtd, parsed_parts, nr_parts);
108         else
109                 add_mtd_device(flash_mtd);
110
111         return 0;
112 }
113
114 static void __exit cleanup_soleng_maps(void)
115 {
116         if (eprom_mtd) {
117                 del_mtd_device(eprom_mtd);
118                 map_destroy(eprom_mtd);
119         }
120
121         if (parsed_parts)
122                 del_mtd_partitions(flash_mtd);
123         else
124                 del_mtd_device(flash_mtd);
125         map_destroy(flash_mtd);
126 }
127
128 module_init(init_soleng_maps);
129 module_exit(cleanup_soleng_maps);
130
131 MODULE_LICENSE("GPL");
132 MODULE_AUTHOR("David Woodhouse <dwmw2@infradead.org>");
133 MODULE_DESCRIPTION("MTD map driver for Hitachi SolutionEngine (and similar) boards");
134