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#define MSG_PREFIX "impA7:"   /* prefix for our printk()'s */
28#define MTDID      "impa7-%d"  /* for mtdparts= partitioning */
29
30static struct mtd_info *impa7_mtd[NUM_FLASHBANKS];
31
32static const char * const rom_probe_types[] = { "jedec_probe", NULL };
33
34static struct map_info impa7_map[NUM_FLASHBANKS] = {
35	{
36		.name = "impA7 NOR Flash Bank #0",
37		.size = WINDOW_SIZE0,
38		.bankwidth = BUSWIDTH,
39	},
40	{
41		.name = "impA7 NOR Flash Bank #1",
42		.size = WINDOW_SIZE1,
43		.bankwidth = BUSWIDTH,
44	},
45};
46
47/*
48 * MTD partitioning stuff
49 */
50static struct mtd_partition partitions[] =
51{
52	{
53		.name = "FileSystem",
54		.size = 0x800000,
55		.offset = 0x00000000
56	},
57};
58
59static int __init init_impa7(void)
60{
61	const char * const *type;
62	int i;
63	static struct { u_long addr; u_long size; } pt[NUM_FLASHBANKS] = {
64	  { WINDOW_ADDR0, WINDOW_SIZE0 },
65	  { WINDOW_ADDR1, WINDOW_SIZE1 },
66        };
67	int devicesfound = 0;
68
69	for(i=0; i<NUM_FLASHBANKS; i++)
70	{
71		printk(KERN_NOTICE MSG_PREFIX "probing 0x%08lx at 0x%08lx\n",
72		       pt[i].size, pt[i].addr);
73
74		impa7_map[i].phys = pt[i].addr;
75		impa7_map[i].virt = ioremap(pt[i].addr, pt[i].size);
76		if (!impa7_map[i].virt) {
77			printk(MSG_PREFIX "failed to ioremap\n");
78			return -EIO;
79		}
80		simple_map_init(&impa7_map[i]);
81
82		impa7_mtd[i] = NULL;
83		type = rom_probe_types;
84		for(; !impa7_mtd[i] && *type; type++) {
85			impa7_mtd[i] = do_map_probe(*type, &impa7_map[i]);
86		}
87
88		if (impa7_mtd[i]) {
89			impa7_mtd[i]->owner = THIS_MODULE;
90			devicesfound++;
91			mtd_device_parse_register(impa7_mtd[i], NULL, NULL,
92						  partitions,
93						  ARRAY_SIZE(partitions));
94		} else {
95			iounmap((void __iomem *)impa7_map[i].virt);
96		}
97	}
98	return devicesfound == 0 ? -ENXIO : 0;
99}
100
101static void __exit cleanup_impa7(void)
102{
103	int i;
104	for (i=0; i<NUM_FLASHBANKS; i++) {
105		if (impa7_mtd[i]) {
106			mtd_device_unregister(impa7_mtd[i]);
107			map_destroy(impa7_mtd[i]);
108			iounmap((void __iomem *)impa7_map[i].virt);
109			impa7_map[i].virt = NULL;
110		}
111	}
112}
113
114module_init(init_impa7);
115module_exit(cleanup_impa7);
116
117MODULE_LICENSE("GPL");
118MODULE_AUTHOR("Pavel Bartusek <pba@sysgo.de>");
119MODULE_DESCRIPTION("MTD map driver for implementa impA7");
120