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