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 
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%08lx, EPROM at 0x%08lx\n",
63 	       soleng_flash_map.phys & 0x1fffffff,
64 	       soleng_eprom_map.phys & 0x1fffffff);
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 
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