impa7.c
2.85 KB
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/*
* Handle mapping of the NOR flash on implementa A7 boards
*
* Copyright 2002 SYSGO Real-Time Solutions GmbH
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
#include <linux/module.h>
#include <linux/types.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <asm/io.h>
#include <linux/mtd/mtd.h>
#include <linux/mtd/map.h>
#include <linux/mtd/partitions.h>
#define WINDOW_ADDR0 0x00000000 /* physical properties of flash */
#define WINDOW_SIZE0 0x00800000
#define WINDOW_ADDR1 0x10000000 /* physical properties of flash */
#define WINDOW_SIZE1 0x00800000
#define NUM_FLASHBANKS 2
#define BUSWIDTH 4
#define MSG_PREFIX "impA7:" /* prefix for our printk()'s */
#define MTDID "impa7-%d" /* for mtdparts= partitioning */
static struct mtd_info *impa7_mtd[NUM_FLASHBANKS];
static const char * const rom_probe_types[] = { "jedec_probe", NULL };
static struct map_info impa7_map[NUM_FLASHBANKS] = {
{
.name = "impA7 NOR Flash Bank #0",
.size = WINDOW_SIZE0,
.bankwidth = BUSWIDTH,
},
{
.name = "impA7 NOR Flash Bank #1",
.size = WINDOW_SIZE1,
.bankwidth = BUSWIDTH,
},
};
/*
* MTD partitioning stuff
*/
static struct mtd_partition partitions[] =
{
{
.name = "FileSystem",
.size = 0x800000,
.offset = 0x00000000
},
};
static int __init init_impa7(void)
{
const char * const *type;
int i;
static struct { u_long addr; u_long size; } pt[NUM_FLASHBANKS] = {
{ WINDOW_ADDR0, WINDOW_SIZE0 },
{ WINDOW_ADDR1, WINDOW_SIZE1 },
};
int devicesfound = 0;
for(i=0; i<NUM_FLASHBANKS; i++)
{
printk(KERN_NOTICE MSG_PREFIX "probing 0x%08lx at 0x%08lx\n",
pt[i].size, pt[i].addr);
impa7_map[i].phys = pt[i].addr;
impa7_map[i].virt = ioremap(pt[i].addr, pt[i].size);
if (!impa7_map[i].virt) {
printk(MSG_PREFIX "failed to ioremap\n");
return -EIO;
}
simple_map_init(&impa7_map[i]);
impa7_mtd[i] = NULL;
type = rom_probe_types;
for(; !impa7_mtd[i] && *type; type++) {
impa7_mtd[i] = do_map_probe(*type, &impa7_map[i]);
}
if (impa7_mtd[i]) {
impa7_mtd[i]->owner = THIS_MODULE;
devicesfound++;
mtd_device_parse_register(impa7_mtd[i], NULL, NULL,
partitions,
ARRAY_SIZE(partitions));
} else {
iounmap((void __iomem *)impa7_map[i].virt);
}
}
return devicesfound == 0 ? -ENXIO : 0;
}
static void __exit cleanup_impa7(void)
{
int i;
for (i=0; i<NUM_FLASHBANKS; i++) {
if (impa7_mtd[i]) {
mtd_device_unregister(impa7_mtd[i]);
map_destroy(impa7_mtd[i]);
iounmap((void __iomem *)impa7_map[i].virt);
impa7_map[i].virt = NULL;
}
}
}
module_init(init_impa7);
module_exit(cleanup_impa7);
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Pavel Bartusek <pba@sysgo.de>");
MODULE_DESCRIPTION("MTD map driver for implementa impA7");