1/*
2 * Handle mapping of the NOR flash on implementa A7 boards
3 *
4 * Copyright 2002 SYSGO Real-Time Solutions GmbH
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 as
8 * published by the Free Software Foundation.
9 */
10
11#include <linux/module.h>
12#include <linux/types.h>
13#include <linux/kernel.h>
14#include <linux/init.h>
15#include <asm/io.h>
16#include <linux/mtd/mtd.h>
17#include <linux/mtd/map.h>
18#include <linux/mtd/partitions.h>
19
20#define WINDOW_ADDR0 0x00000000      /* physical properties of flash */
21#define WINDOW_SIZE0 0x00800000
22#define WINDOW_ADDR1 0x10000000      /* physical properties of flash */
23#define WINDOW_SIZE1 0x00800000
24#define NUM_FLASHBANKS 2
25#define BUSWIDTH     4
26
27/* can be { "cfi_probe", "jedec_probe", "map_rom", NULL } */
28#define PROBETYPES { "jedec_probe", NULL }
29
30#define MSG_PREFIX "impA7:"   /* prefix for our printk()'s */
31#define MTDID      "impa7-%d"  /* for mtdparts= partitioning */
32
33static struct mtd_info *impa7_mtd[NUM_FLASHBANKS];
34
35
36static struct map_info impa7_map[NUM_FLASHBANKS] = {
37	{
38		.name = "impA7 NOR Flash Bank #0",
39		.size = WINDOW_SIZE0,
40		.bankwidth = BUSWIDTH,
41	},
42	{
43		.name = "impA7 NOR Flash Bank #1",
44		.size = WINDOW_SIZE1,
45		.bankwidth = BUSWIDTH,
46	},
47};
48
49/*
50 * MTD partitioning stuff
51 */
52static struct mtd_partition partitions[] =
53{
54	{
55		.name = "FileSystem",
56		.size = 0x800000,
57		.offset = 0x00000000
58	},
59};
60
61static int __init init_impa7(void)
62{
63	static const char *rom_probe_types[] = PROBETYPES;
64	const char **type;
65	int i;
66	static struct { u_long addr; u_long size; } pt[NUM_FLASHBANKS] = {
67	  { WINDOW_ADDR0, WINDOW_SIZE0 },
68	  { WINDOW_ADDR1, WINDOW_SIZE1 },
69        };
70	int devicesfound = 0;
71
72	for(i=0; i<NUM_FLASHBANKS; i++)
73	{
74		printk(KERN_NOTICE MSG_PREFIX "probing 0x%08lx at 0x%08lx\n",
75		       pt[i].size, pt[i].addr);
76
77		impa7_map[i].phys = pt[i].addr;
78		impa7_map[i].virt = ioremap(pt[i].addr, pt[i].size);
79		if (!impa7_map[i].virt) {
80			printk(MSG_PREFIX "failed to ioremap\n");
81			return -EIO;
82		}
83		simple_map_init(&impa7_map[i]);
84
85		impa7_mtd[i] = 0;
86		type = rom_probe_types;
87		for(; !impa7_mtd[i] && *type; type++) {
88			impa7_mtd[i] = do_map_probe(*type, &impa7_map[i]);
89		}
90
91		if (impa7_mtd[i]) {
92			impa7_mtd[i]->owner = THIS_MODULE;
93			devicesfound++;
94			mtd_device_parse_register(impa7_mtd[i], NULL, NULL,
95						  partitions,
96						  ARRAY_SIZE(partitions));
97		}
98		else
99			iounmap((void *)impa7_map[i].virt);
100	}
101	return devicesfound == 0 ? -ENXIO : 0;
102}
103
104static void __exit cleanup_impa7(void)
105{
106	int i;
107	for (i=0; i<NUM_FLASHBANKS; i++) {
108		if (impa7_mtd[i]) {
109			mtd_device_unregister(impa7_mtd[i]);
110			map_destroy(impa7_mtd[i]);
111			iounmap((void *)impa7_map[i].virt);
112			impa7_map[i].virt = 0;
113		}
114	}
115}
116
117module_init(init_impa7);
118module_exit(cleanup_impa7);
119
120MODULE_LICENSE("GPL");
121MODULE_AUTHOR("Pavel Bartusek <pba@sysgo.de>");
122MODULE_DESCRIPTION("MTD map driver for implementa impA7");
123