1/*
2 *  Copyright © 2001 Flaga hf. Medical Devices, Kári Davíðsson <kd@flaga.is>
3 *
4 *  This program is free software; you can redistribute  it and/or modify it
5 *  under  the terms of  the GNU General  Public License as published by the
6 *  Free Software Foundation;  either version 2 of the  License, or (at your
7 *  option) any later version.
8 *
9 *  THIS  SOFTWARE  IS PROVIDED   ``AS  IS'' AND   ANY  EXPRESS OR IMPLIED
10 *  WARRANTIES,   INCLUDING, BUT NOT  LIMITED  TO, THE IMPLIED WARRANTIES OF
11 *  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN
12 *  NO  EVENT  SHALL   THE AUTHOR  BE    LIABLE FOR ANY   DIRECT, INDIRECT,
13 *  INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
14 *  NOT LIMITED   TO, PROCUREMENT OF  SUBSTITUTE GOODS  OR SERVICES; LOSS OF
15 *  USE, DATA,  OR PROFITS; OR  BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
16 *  ANY THEORY OF LIABILITY, WHETHER IN  CONTRACT, STRICT LIABILITY, OR TORT
17 *  (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
18 *  THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
19 *
20 *  You should have received a copy of the  GNU General Public License along
21 *  with this program; if not, write  to the Free Software Foundation, Inc.,
22 *  675 Mass Ave, Cambridge, MA 02139, USA.
23 */
24
25#include <linux/module.h>
26#include <linux/types.h>
27#include <linux/kernel.h>
28#include <linux/init.h>
29#include <asm/io.h>
30#include <linux/mtd/mtd.h>
31#include <linux/mtd/map.h>
32#include <linux/mtd/partitions.h>
33
34
35/* We split the flash chip up into four parts.
36 * 1: bootloader first 128k			(0x00000000 - 0x0001FFFF) size 0x020000
37 * 2: kernel 640k					(0x00020000 - 0x000BFFFF) size 0x0A0000
38 * 3: compressed 1536k root ramdisk	(0x000C0000 - 0x0023FFFF) size 0x180000
39 * 4: writeable diskpartition (jffs)(0x00240000 - 0x003FFFFF) size 0x1C0000
40 */
41
42#define FLASH_PHYS_ADDR 0x40000000
43#define FLASH_SIZE 0x400000
44
45#define FLASH_PARTITION0_ADDR 0x00000000
46#define FLASH_PARTITION0_SIZE 0x00020000
47
48#define FLASH_PARTITION1_ADDR 0x00020000
49#define FLASH_PARTITION1_SIZE 0x000A0000
50
51#define FLASH_PARTITION2_ADDR 0x000C0000
52#define FLASH_PARTITION2_SIZE 0x00180000
53
54#define FLASH_PARTITION3_ADDR 0x00240000
55#define FLASH_PARTITION3_SIZE 0x001C0000
56
57
58static struct map_info flagadm_map = {
59		.name =		"FlagaDM flash device",
60		.size =		FLASH_SIZE,
61		.bankwidth =	2,
62};
63
64static struct mtd_partition flagadm_parts[] = {
65	{
66		.name =		"Bootloader",
67		.offset	=	FLASH_PARTITION0_ADDR,
68		.size =		FLASH_PARTITION0_SIZE
69	},
70	{
71		.name =		"Kernel image",
72		.offset =	FLASH_PARTITION1_ADDR,
73		.size =		FLASH_PARTITION1_SIZE
74	},
75	{
76		.name =		"Initial ramdisk image",
77		.offset =	FLASH_PARTITION2_ADDR,
78		.size =		FLASH_PARTITION2_SIZE
79	},
80	{
81		.name =		"Persistent storage",
82		.offset =	FLASH_PARTITION3_ADDR,
83		.size =		FLASH_PARTITION3_SIZE
84	}
85};
86
87#define PARTITION_COUNT ARRAY_SIZE(flagadm_parts)
88
89static struct mtd_info *mymtd;
90
91static int __init init_flagadm(void)
92{
93	printk(KERN_NOTICE "FlagaDM flash device: %x at %x\n",
94			FLASH_SIZE, FLASH_PHYS_ADDR);
95
96	flagadm_map.phys = FLASH_PHYS_ADDR;
97	flagadm_map.virt = ioremap(FLASH_PHYS_ADDR,
98					FLASH_SIZE);
99
100	if (!flagadm_map.virt) {
101		printk("Failed to ioremap\n");
102		return -EIO;
103	}
104
105	simple_map_init(&flagadm_map);
106
107	mymtd = do_map_probe("cfi_probe", &flagadm_map);
108	if (mymtd) {
109		mymtd->owner = THIS_MODULE;
110		mtd_device_register(mymtd, flagadm_parts, PARTITION_COUNT);
111		printk(KERN_NOTICE "FlagaDM flash device initialized\n");
112		return 0;
113	}
114
115	iounmap((void __iomem *)flagadm_map.virt);
116	return -ENXIO;
117}
118
119static void __exit cleanup_flagadm(void)
120{
121	if (mymtd) {
122		mtd_device_unregister(mymtd);
123		map_destroy(mymtd);
124	}
125	if (flagadm_map.virt) {
126		iounmap((void __iomem *)flagadm_map.virt);
127		flagadm_map.virt = NULL;
128	}
129}
130
131module_init(init_flagadm);
132module_exit(cleanup_flagadm);
133
134
135MODULE_LICENSE("GPL");
136MODULE_AUTHOR("Kári Davíðsson <kd@flaga.is>");
137MODULE_DESCRIPTION("MTD map driver for Flaga digital module");
138