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 *probes[] = { "RedBoot", "cmdlinepart", NULL };
35 
36 #ifdef CONFIG_MTD_SUPERH_RESERVE
37 static struct mtd_partition superh_se_partitions[] = {
38 	/* Reserved for boot code, read-only */
39 	{
40 		.name = "flash_boot",
41 		.offset = 0x00000000,
42 		.size = CONFIG_MTD_SUPERH_RESERVE,
43 		.mask_flags = MTD_WRITEABLE,
44 	},
45 	/* All else is writable (e.g. JFFS) */
46 	{
47 		.name = "Flash FS",
48 		.offset = MTDPART_OFS_NXTBLK,
49 		.size = MTDPART_SIZ_FULL,
50 	}
51 };
52 #define NUM_PARTITIONS ARRAY_SIZE(superh_se_partitions)
53 #else
54 #define superh_se_partitions NULL
55 #define NUM_PARTITIONS 0
56 #endif /* CONFIG_MTD_SUPERH_RESERVE */
57 
58 static int __init init_soleng_maps(void)
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 		mtd_device_register(eprom_mtd, NULL, 0);
93 	}
94 
95 	mtd_device_parse_register(flash_mtd, probes, 0,
96 			superh_se_partitions, NUM_PARTITIONS);
97 
98 	return 0;
99 }
100 
101 static void __exit cleanup_soleng_maps(void)
102 {
103 	if (eprom_mtd) {
104 		mtd_device_unregister(eprom_mtd);
105 		map_destroy(eprom_mtd);
106 	}
107 
108 	mtd_device_unregister(flash_mtd);
109 	map_destroy(flash_mtd);
110 }
111 
112 module_init(init_soleng_maps);
113 module_exit(cleanup_soleng_maps);
114 
115 MODULE_LICENSE("GPL");
116 MODULE_AUTHOR("David Woodhouse <dwmw2@infradead.org>");
117 MODULE_DESCRIPTION("MTD map driver for Hitachi SolutionEngine (and similar) boards");
118 
119