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 struct map_info soleng_eprom_map = {
23 .name = "Solution Engine EPROM",
24 .size = 0x400000,
25 .bankwidth = 4,
26 };
27
28 struct map_info soleng_flash_map = {
29 .name = "Solution Engine FLASH",
30 .size = 0x400000,
31 .bankwidth = 4,
32 };
33
34 static const char * const probes[] = { "RedBoot", "cmdlinepart", NULL };
35
init_soleng_maps(void)36 static int __init init_soleng_maps(void)
37 {
38 /* First probe at offset 0 */
39 soleng_flash_map.phys = 0;
40 soleng_flash_map.virt = (void __iomem *)P2SEGADDR(0);
41 soleng_eprom_map.phys = 0x01000000;
42 soleng_eprom_map.virt = (void __iomem *)P1SEGADDR(0x01000000);
43 simple_map_init(&soleng_eprom_map);
44 simple_map_init(&soleng_flash_map);
45
46 printk(KERN_NOTICE "Probing for flash chips at 0x00000000:\n");
47 flash_mtd = do_map_probe("cfi_probe", &soleng_flash_map);
48 if (!flash_mtd) {
49 /* Not there. Try swapping */
50 printk(KERN_NOTICE "Probing for flash chips at 0x01000000:\n");
51 soleng_flash_map.phys = 0x01000000;
52 soleng_flash_map.virt = P2SEGADDR(0x01000000);
53 soleng_eprom_map.phys = 0;
54 soleng_eprom_map.virt = P1SEGADDR(0);
55 flash_mtd = do_map_probe("cfi_probe", &soleng_flash_map);
56 if (!flash_mtd) {
57 /* Eep. */
58 printk(KERN_NOTICE "Flash chips not detected at either possible location.\n");
59 return -ENXIO;
60 }
61 }
62 printk(KERN_NOTICE "Solution Engine: Flash at 0x%pap, EPROM at 0x%pap\n",
63 &soleng_flash_map.phys,
64 &soleng_eprom_map.phys);
65 flash_mtd->owner = THIS_MODULE;
66
67 eprom_mtd = do_map_probe("map_rom", &soleng_eprom_map);
68 if (eprom_mtd) {
69 eprom_mtd->owner = THIS_MODULE;
70 mtd_device_register(eprom_mtd, NULL, 0);
71 }
72
73 mtd_device_parse_register(flash_mtd, probes, NULL, NULL, 0);
74
75 return 0;
76 }
77
cleanup_soleng_maps(void)78 static void __exit cleanup_soleng_maps(void)
79 {
80 if (eprom_mtd) {
81 mtd_device_unregister(eprom_mtd);
82 map_destroy(eprom_mtd);
83 }
84
85 mtd_device_unregister(flash_mtd);
86 map_destroy(flash_mtd);
87 }
88
89 module_init(init_soleng_maps);
90 module_exit(cleanup_soleng_maps);
91
92 MODULE_LICENSE("GPL");
93 MODULE_AUTHOR("David Woodhouse <dwmw2@infradead.org>");
94 MODULE_DESCRIPTION("MTD map driver for Hitachi SolutionEngine (and similar) boards");
95
96