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
19static struct mtd_info *flash_mtd;
20static struct mtd_info *eprom_mtd;
21
22struct map_info soleng_eprom_map = {
23	.name = "Solution Engine EPROM",
24	.size = 0x400000,
25	.bankwidth = 4,
26};
27
28struct map_info soleng_flash_map = {
29	.name = "Solution Engine FLASH",
30	.size = 0x400000,
31	.bankwidth = 4,
32};
33
34static const char * const probes[] = { "RedBoot", "cmdlinepart", NULL };
35
36static 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
78static 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
89module_init(init_soleng_maps);
90module_exit(cleanup_soleng_maps);
91
92MODULE_LICENSE("GPL");
93MODULE_AUTHOR("David Woodhouse <dwmw2@infradead.org>");
94MODULE_DESCRIPTION("MTD map driver for Hitachi SolutionEngine (and similar) boards");
95
96