/*
* Flash memory support for various TI OMAP boards
*
* Copyright (C) 2001-2002 MontaVista Software Inc.
* Copyright (C) 2003-2004 Texas Instruments
* Copyright (C) 2004 Nokia Corporation
*
* Assembled using driver code copyright the companies above
* and written by David Brownell, Jian Zhang <jzhang@ti.com>,
* Tony Lindgren <tony@atomide.com> and others.
*
* 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 SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN
* NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
* USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
* ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
* 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.,
* 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include <linux/platform_device.h>
#include <linux/module.h>
#include <linux/types.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/ioport.h>
#include <linux/slab.h>
#include <linux/mtd/mtd.h>
#include <linux/mtd/map.h>
#include <linux/mtd/partitions.h>
#include <asm/io.h>
#include <asm/hardware.h>
#include <asm/mach/flash.h>
#include <asm/arch/tc.h>
#ifdef CONFIG_MTD_PARTITIONS
static const char *part_probes[] = { /* "RedBoot", */ "cmdlinepart", NULL };
#endif
struct omapflash_info {
struct mtd_partition *parts;
struct mtd_info *mtd;
struct map_info map;
};
static void omap_set_vpp(struct map_info *map, int enable)
{
static int count;
if (enable) {
if (count++ == 0)
OMAP_EMIFS_CONFIG_REG |= OMAP_EMIFS_CONFIG_WP;
} else {
if (count && (--count == 0))
OMAP_EMIFS_CONFIG_REG &= ~OMAP_EMIFS_CONFIG_WP;
}
}
static int __devinit omapflash_probe(struct device *dev)
{
int err;
struct omapflash_info *info;
struct platform_device *pdev = to_platform_device(dev);
struct flash_platform_data *pdata = pdev->dev.platform_data;
struct resource *res = pdev->resource;
unsigned long size = res->end - res->start + 1;
info = kmalloc(sizeof(struct omapflash_info), GFP_KERNEL);
if (!info)
return -ENOMEM;
memset(info, 0, sizeof(struct omapflash_info));
if (!request_mem_region(res->start, size, "flash")) {
err = -EBUSY;
goto out_free_info;
}
info->map.virt = ioremap(res->start, size);
if (!info->map.virt) {
err = -ENOMEM;
goto out_release_mem_region;
}
info->map.name = pdev->dev.bus_id;
info->map.phys = res->start;
info->map.size = size;
info->map.bankwidth = pdata->width;
info->map.set_vpp = omap_set_vpp;
simple_map_init(&info->map);
info->mtd = do_map_probe(pdata->map_name, &info->map);
if (!info->mtd) {
err = -EIO;
goto out_iounmap;
}
info->mtd->owner = THIS_MODULE;
#ifdef CONFIG_MTD_PARTITIONS
err = parse_mtd_partitions(info->mtd, part_probes, &info->parts, 0);
if (err > 0)
add_mtd_partitions(info->mtd, info->parts, err);
else if (err < 0 && pdata->parts)
add_mtd_partitions(info->mtd, pdata->parts, pdata->nr_parts);
else
#endif
add_mtd_device(info->mtd);
dev_set_drvdata(&pdev->dev, info);
return 0;
out_iounmap:
iounmap(info->map.virt);
out_release_mem_region:
release_mem_region(res->start, size);
out_free_info:
kfree(info);
return err;
}
static int __devexit omapflash_remove(struct device *dev)
{
struct platform_device *pdev = to_platform_device(dev);
struct omapflash_info *info = dev_get_drvdata(&pdev->dev);
dev_set_drvdata(&pdev->dev, NULL);
if (info) {
if (info->parts) {
del_mtd_partitions(info->mtd);
kfree(info->parts);
} else
del_mtd_device(info->mtd);
map_destroy(info->mtd);
release_mem_region(info->map.phys, info->map.size);
iounmap((void __iomem *) info->map.virt);
kfree(info);
}
return 0;
}
static struct device_driver omapflash_driver = {
.name = "omapflash",
.bus = &platform_bus_type,
.probe = omapflash_probe,
.remove = __devexit_p(omapflash_remove),
};
static int __init omapflash_init(void)
{
return driver_register(&omapflash_driver);
}
static void __exit omapflash_exit(void)
{
driver_unregister(&omapflash_driver);
}
module_init(omapflash_init);
module_exit(omapflash_exit);
MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("MTD NOR map driver for TI OMAP boards");
