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/*======================================================================
drivers/mtd/maps/integrator-flash.c: ARM Integrator flash map driver
Copyright (C) 2000 ARM Limited
Copyright (C) 2003 Deep Blue Solutions Ltd.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
This is access code for flashes using ARM's flash partitioning
standards.
$Id: integrator-flash.c,v 1.18 2004/11/01 13:26:15 rmk Exp $
======================================================================*/
#include <linux/config.h>
#include <linux/module.h>
#include <linux/types.h>
#include <linux/kernel.h>
#include <linux/slab.h>
#include <linux/ioport.h>
#include <linux/platform_device.h>
#include <linux/init.h>
#include <linux/mtd/mtd.h>
#include <linux/mtd/map.h>
#include <linux/mtd/partitions.h>
#include <asm/mach/flash.h>
#include <asm/hardware.h>
#include <asm/io.h>
#include <asm/system.h>
#ifdef CONFIG_ARCH_P720T
#define FLASH_BASE (0x04000000)
#define FLASH_SIZE (64*1024*1024)
#endif
struct armflash_info {
struct flash_platform_data *plat;
struct resource *res;
struct mtd_partition *parts;
struct mtd_info *mtd;
struct map_info map;
};
static void armflash_set_vpp(struct map_info *map, int on)
{
struct armflash_info *info = container_of(map, struct armflash_info, map);
if (info->plat && info->plat->set_vpp)
info->plat->set_vpp(on);
}
static const char *probes[] = { "cmdlinepart", "RedBoot", "afs", NULL };
static int armflash_probe(struct device *_dev)
{
struct platform_device *dev = to_platform_device(_dev);
struct flash_platform_data *plat = dev->dev.platform_data;
struct resource *res = dev->resource;
unsigned int size = res->end - res->start + 1;
struct armflash_info *info;
int err;
void __iomem *base;
info = kmalloc(sizeof(struct armflash_info), GFP_KERNEL);
if (!info) {
err = -ENOMEM;
goto out;
}
memset(info, 0, sizeof(struct armflash_info));
info->plat = plat;
if (plat && plat->init) {
err = plat->init();
if (err)
goto no_resource;
}
info->res = request_mem_region(res->start, size, "armflash");
if (!info->res) {
err = -EBUSY;
goto no_resource;
}
base = ioremap(res->start, size);
if (!base) {
err = -ENOMEM;
goto no_mem;
}
/*
* look for CFI based flash parts fitted to this board
*/
info->map.size = size;
info->map.bankwidth = plat->width;
info->map.phys = res->start;
info->map.virt = base;
info->map.name = dev->dev.bus_id;
info->map.set_vpp = armflash_set_vpp;
simple_map_init(&info->map);
/*
* Also, the CFI layer automatically works out what size
* of chips we have, and does the necessary identification
* for us automatically.
*/
info->mtd = do_map_probe(plat->map_name, &info->map);
if (!info->mtd) {
err = -ENXIO;
goto no_device;
}
info->mtd->owner = THIS_MODULE;
err = parse_mtd_partitions(info->mtd, probes, &info->parts, 0);
if (err > 0) {
err = add_mtd_partitions(info->mtd, info->parts, err);
if (err)
printk(KERN_ERR
"mtd partition registration failed: %d\n", err);
}
if (err == 0)
dev_set_drvdata(&dev->dev, info);
/*
* If we got an error, free all resources.
*/
if (err < 0) {
if (info->mtd) {
del_mtd_partitions(info->mtd);
map_destroy(info->mtd);
}
kfree(info->parts);
no_device:
iounmap(base);
no_mem:
release_mem_region(res->start, size);
no_resource:
if (plat && plat->exit)
plat->exit();
kfree(info);
}
out:
return err;
}
static int armflash_remove(struct device *_dev)
{
struct platform_device *dev = to_platform_device(_dev);
struct armflash_info *info = dev_get_drvdata(&dev->dev);
dev_set_drvdata(&dev->dev, NULL);
if (info) {
if (info->mtd) {
del_mtd_partitions(info->mtd);
map_destroy(info->mtd);
}
kfree(info->parts);
iounmap(info->map.virt);
release_resource(info->res);
kfree(info->res);
if (info->plat && info->plat->exit)
info->plat->exit();
kfree(info);
}
return 0;
}
static struct device_driver armflash_driver = {
.name = "armflash",
.bus = &platform_bus_type,
.probe = armflash_probe,
.remove = armflash_remove,
};
static int __init armflash_init(void)
{
return driver_register(&armflash_driver);
}
static void __exit armflash_exit(void)
{
driver_unregister(&armflash_driver);
}
module_init(armflash_init);
module_exit(armflash_exit);
MODULE_AUTHOR("ARM Ltd");
MODULE_DESCRIPTION("ARM Integrator CFI map driver");
MODULE_LICENSE("GPL");
|
