Merge branch 'for-linus' of master.kernel.org:/pub/scm/linux/kernel/git/roland/infiniband
[linux-2.6] / drivers / mtd / maps / solutionengine.c
1 /*
2  * $Id: solutionengine.c,v 1.15 2005/11/07 11:14:28 gleixner Exp $
3  *
4  * Flash and EPROM on Hitachi Solution Engine and similar boards.
5  *
6  * (C) 2001 Red Hat, Inc.
7  *
8  * GPL'd
9  */
10
11 #include <linux/module.h>
12 #include <linux/types.h>
13 #include <linux/kernel.h>
14 #include <linux/init.h>
15 #include <asm/io.h>
16 #include <linux/mtd/mtd.h>
17 #include <linux/mtd/map.h>
18 #include <linux/mtd/partitions.h>
19 #include <linux/config.h>
20 #include <linux/errno.h>
21
22 static struct mtd_info *flash_mtd;
23 static struct mtd_info *eprom_mtd;
24
25 static struct mtd_partition *parsed_parts;
26
27 struct map_info soleng_eprom_map = {
28         .name = "Solution Engine EPROM",
29         .size = 0x400000,
30         .bankwidth = 4,
31 };
32
33 struct map_info soleng_flash_map = {
34         .name = "Solution Engine FLASH",
35         .size = 0x400000,
36         .bankwidth = 4,
37 };
38
39 static const char *probes[] = { "RedBoot", "cmdlinepart", NULL };
40
41 #ifdef CONFIG_MTD_SUPERH_RESERVE
42 static struct mtd_partition superh_se_partitions[] = {
43         /* Reserved for boot code, read-only */
44         {
45                 .name = "flash_boot",
46                 .offset = 0x00000000,
47                 .size = CONFIG_MTD_SUPERH_RESERVE,
48                 .mask_flags = MTD_WRITEABLE,
49         },
50         /* All else is writable (e.g. JFFS) */
51         {
52                 .name = "Flash FS",
53                 .offset = MTDPART_OFS_NXTBLK,
54                 .size = MTDPART_SIZ_FULL,
55         }
56 };
57 #endif /* CONFIG_MTD_SUPERH_RESERVE */
58
59 static int __init init_soleng_maps(void)
60 {
61         int nr_parts = 0;
62
63         /* First probe at offset 0 */
64         soleng_flash_map.phys = 0;
65         soleng_flash_map.virt = (void __iomem *)P2SEGADDR(0);
66         soleng_eprom_map.phys = 0x01000000;
67         soleng_eprom_map.virt = (void __iomem *)P1SEGADDR(0x01000000);
68         simple_map_init(&soleng_eprom_map);
69         simple_map_init(&soleng_flash_map);
70
71         printk(KERN_NOTICE "Probing for flash chips at 0x00000000:\n");
72         flash_mtd = do_map_probe("cfi_probe", &soleng_flash_map);
73         if (!flash_mtd) {
74                 /* Not there. Try swapping */
75                 printk(KERN_NOTICE "Probing for flash chips at 0x01000000:\n");
76                 soleng_flash_map.phys = 0x01000000;
77                 soleng_flash_map.virt = P2SEGADDR(0x01000000);
78                 soleng_eprom_map.phys = 0;
79                 soleng_eprom_map.virt = P1SEGADDR(0);
80                 flash_mtd = do_map_probe("cfi_probe", &soleng_flash_map);
81                 if (!flash_mtd) {
82                         /* Eep. */
83                         printk(KERN_NOTICE "Flash chips not detected at either possible location.\n");
84                         return -ENXIO;
85                 }
86         }
87         printk(KERN_NOTICE "Solution Engine: Flash at 0x%08lx, EPROM at 0x%08lx\n",
88                soleng_flash_map.phys & 0x1fffffff,
89                soleng_eprom_map.phys & 0x1fffffff);
90         flash_mtd->owner = THIS_MODULE;
91
92         eprom_mtd = do_map_probe("map_rom", &soleng_eprom_map);
93         if (eprom_mtd) {
94                 eprom_mtd->owner = THIS_MODULE;
95                 add_mtd_device(eprom_mtd);
96         }
97
98         nr_parts = parse_mtd_partitions(flash_mtd, probes, &parsed_parts, 0);
99
100 #ifdef CONFIG_MTD_SUPERH_RESERVE
101         if (nr_parts <= 0) {
102                 printk(KERN_NOTICE "Using configured partition at 0x%08x.\n",
103                        CONFIG_MTD_SUPERH_RESERVE);
104                 parsed_parts = superh_se_partitions;
105                 nr_parts = sizeof(superh_se_partitions)/sizeof(*parsed_parts);
106         }
107 #endif /* CONFIG_MTD_SUPERH_RESERVE */
108
109         if (nr_parts > 0)
110                 add_mtd_partitions(flash_mtd, parsed_parts, nr_parts);
111         else
112                 add_mtd_device(flash_mtd);
113
114         return 0;
115 }
116
117 static void __exit cleanup_soleng_maps(void)
118 {
119         if (eprom_mtd) {
120                 del_mtd_device(eprom_mtd);
121                 map_destroy(eprom_mtd);
122         }
123
124         if (parsed_parts)
125                 del_mtd_partitions(flash_mtd);
126         else
127                 del_mtd_device(flash_mtd);
128         map_destroy(flash_mtd);
129 }
130
131 module_init(init_soleng_maps);
132 module_exit(cleanup_soleng_maps);
133
134 MODULE_LICENSE("GPL");
135 MODULE_AUTHOR("David Woodhouse <dwmw2@infradead.org>");
136 MODULE_DESCRIPTION("MTD map driver for Hitachi SolutionEngine (and similar) boards");
137