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
135
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