/* linux/drivers/mtd/maps/bast_flash.c
*
* Copyright (c) 2004-2005 Simtec Electronics
* Ben Dooks <ben@simtec.co.uk>
*
* Simtec Bast (EB2410ITX) NOR MTD Mapping driver
*
* Changelog:
* 20-Sep-2004 BJD Initial version
* 17-Jan-2005 BJD Add whole device if no partitions found
*
* $Id: bast-flash.c,v 1.3 2005/10/10 00:13:38 bjd Exp $
*
* 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
*/
#include <linux/module.h>
#include <linux/types.h>
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/string.h>
#include <linux/ioport.h>
#include <linux/device.h>
#include <linux/slab.h>
#include <linux/platform_device.h>
#include <linux/mtd/mtd.h>
#include <linux/mtd/map.h>
#include <linux/mtd/partitions.h>
#include <asm/io.h>
#include <asm/mach/flash.h>
#include <asm/arch/map.h>
#include <asm/arch/bast-map.h>
#include <asm/arch/bast-cpld.h>
#ifdef CONFIG_MTD_BAST_MAXSIZE
#define AREA_MAXSIZE (CONFIG_MTD_BAST_MAXSIZE * SZ_1M)
#else
#define AREA_MAXSIZE (32 * SZ_1M)
#endif
#define PFX "bast-flash: "
struct bast_flash_info {
struct mtd_info *mtd;
struct map_info map;
struct mtd_partition *partitions;
struct resource *area;
};
static const char *probes[] = { "RedBoot", "cmdlinepart", NULL };
static struct bast_flash_info *to_bast_info(struct device *dev)
{
return (struct bast_flash_info *)dev_get_drvdata(dev);
}
static void bast_flash_setrw(int to)
{
unsigned int val;
unsigned long flags;
local_irq_save(flags);
val = __raw_readb(BAST_VA_CTRL3);
if (to)
val |= BAST_CPLD_CTRL3_ROMWEN;
else
val &= ~BAST_CPLD_CTRL3_ROMWEN;
pr_debug("new cpld ctrl3=%02x\n", val);
__raw_writeb(val, BAST_VA_CTRL3);
local_irq_restore(flags);
}
static int bast_flash_remove(struct device *dev)
{
struct bast_flash_info *info = to_bast_info(dev);
dev_set_drvdata(dev, NULL);
if (info == NULL)
return 0;
if (info->map.virt != NULL)
iounmap(info->map.virt);
if (info->mtd) {
del_mtd_partitions(info->mtd);
map_destroy(info->mtd);
}
if (info->partitions)
kfree(info->partitions);
if (info->area) {
release_resource(info->area);
kfree(info->area);
}
kfree(info);
return 0;
}
static int bast_flash_probe(struct device *dev)
{
struct platform_device *pdev = to_platform_device(dev);
struct bast_flash_info *info;
struct resource *res;
int err = 0;
info = kmalloc(sizeof(*info), GFP_KERNEL);
if (info == NULL) {
printk(KERN_ERR PFX "no memory for flash info\n");
err = -ENOMEM;
goto exit_error;
}
memzero(info, sizeof(*info));
dev_set_drvdata(dev, info);
res = pdev->resource; /* assume that the flash has one resource */
info->map.phys = res->start;
info->map.size = res->end - res->start + 1;
info->map.name = dev->bus_id;
info->map.bankwidth = 2;
if (info->map.size > AREA_MAXSIZE)
info->map.size = AREA_MAXSIZE;
pr_debug("%s: area %08lx, size %ld\n", __FUNCTION__,
info->map.phys, info->map.size);
info->area = request_mem_region(res->start, info->map.size,
pdev->name);
if (info->area == NULL) {
printk(KERN_ERR PFX "cannot reserve flash memory region\n");
err = -ENOENT;
goto exit_error;
}
info->map.virt = ioremap(res->start, info->map.size);
pr_debug("%s: virt at %08x\n", __FUNCTION__, (int)info->map.virt);
if (info->map.virt == 0) {
printk(KERN_ERR PFX "failed to ioremap() region\n");
err = -EIO;
goto exit_error;
}
simple_map_init(&info->map);
/* enable the write to the flash area */
bast_flash_setrw(1);
/* probe for the device(s) */
info->mtd = do_map_probe("jedec_probe", &info->map);
if (info->mtd == NULL)
info->mtd = do_map_probe("cfi_probe", &info->map);
if (info->mtd == NULL) {
printk(KERN_ERR PFX "map_probe() failed\n");
err = -ENXIO;
goto exit_error;
}
/* mark ourselves as the owner */
info->mtd->owner = THIS_MODULE;
err = parse_mtd_partitions(info->mtd, probes, &info->partitions, 0);
if (err > 0) {
err = add_mtd_partitions(info->mtd, info->partitions, err);
if (err)
printk(KERN_ERR PFX "cannot add/parse partitions\n");
} else {
err = add_mtd_device(info->mtd);
}
if (err == 0)
return 0;
/* fall through to exit error */
exit_error:
bast_flash_remove(dev);
return err;
}
static struct device_driver bast_flash_driver = {
.name = "bast-nor",
.owner = THIS_MODULE,
.bus = &platform_bus_type,
.probe = bast_flash_probe,
.remove = bast_flash_remove,
};
static int __init bast_flash_init(void)
{
printk("BAST NOR-Flash Driver, (c) 2004 Simtec Electronics\n");
return driver_register(&bast_flash_driver);
}
static void __exit bast_flash_exit(void)
{
driver_unregister(&bast_flash_driver);
}
module_init(bast_flash_init);
module_exit(bast_flash_exit);
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Ben Dooks <ben@simtec.co.uk>");
MODULE_DESCRIPTION("BAST MTD Map driver");
