Commit 99f2a8ae authored by Ben Dooks's avatar Ben Dooks Committed by Thomas Gleixner

[MTD] Platform RAM Driver

Driver for generic RAM blocks which are exported by an platform_device
from the device driver system.
Signed-off-by: default avatarBen Dooks <ben@simtec.co.uk>
Signed-off-by: default avatarThomas Gleixner <tglx@linutronix.de>
parent a4ab4c5d
# drivers/mtd/maps/Kconfig
# $Id: Kconfig,v 1.42 2005/01/05 16:59:50 dwmw2 Exp $
# $Id: Kconfig,v 1.43 2005/01/24 00:35:21 bjd Exp $
menu "Mapping drivers for chip access"
depends on MTD!=n
......@@ -659,5 +659,15 @@ config MTD_SHARP_SL
help
This enables access to the flash chip on the Sharp SL Series of PDAs.
config MTD_PLATRAM
tristate "Map driver for platfrom device RAM (mtd-ram)"
depends on MTD
select MTD_RAM
help
Map driver for RAM areas described via the platform device
system.
This selection automatically selects the map_ram driver.
endmenu
#
# linux/drivers/maps/Makefile
#
# $Id: Makefile.common,v 1.23 2005/01/05 17:06:36 dwmw2 Exp $
# $Id: Makefile.common,v 1.24 2005/01/24 00:35:21 bjd Exp $
ifeq ($(CONFIG_MTD_COMPLEX_MAPPINGS),y)
obj-$(CONFIG_MTD) += map_funcs.o
......@@ -71,3 +71,4 @@ obj-$(CONFIG_MTD_IXP2000) += ixp2000.o
obj-$(CONFIG_MTD_WRSBC8260) += wr_sbc82xx_flash.o
obj-$(CONFIG_MTD_DMV182) += dmv182.o
obj-$(CONFIG_MTD_SHARP_SL) += sharpsl-flash.o
obj-$(CONFIG_MTD_PLATRAM) += plat-ram.o
/* drivers/mtd/maps/plat-ram.c
*
* (c) 2004-2005 Simtec Electronics
* http://www.simtec.co.uk/products/SWLINUX/
* Ben Dooks <ben@simtec.co.uk>
*
* Generic platfrom device based RAM map
*
* $Id: plat-ram.c,v 1.1 2005/01/24 00:37:02 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
*/
#define DEBUG
#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/mtd/mtd.h>
#include <linux/mtd/map.h>
#include <linux/mtd/partitions.h>
#include <linux/mtd/plat-ram.h>
#include <asm/io.h>
/* private structure for each mtd platform ram device created */
struct platram_info {
struct device *dev;
struct mtd_info *mtd;
struct map_info map;
struct mtd_partition *partitions;
struct resource *area;
struct platdata_mtd_ram *pdata;
};
/* to_platram_info()
*
* device private data to struct platram_info conversion
*/
static inline struct platram_info *to_platram_info(struct device *dev)
{
return (struct platram_info *)dev_get_drvdata(dev);
}
/* platram_setrw
*
* call the platform device's set rw/ro control
*
* to = 0 => read-only
* = 1 => read-write
*/
static inline void platram_setrw(struct platram_info *info, int to)
{
if (info->pdata == NULL)
return;
if (info->pdata->set_rw != NULL)
(info->pdata->set_rw)(info->dev, to);
}
/* platram_remove
*
* called to remove the device from the driver's control
*/
static int platram_remove(struct device *dev)
{
struct platram_info *info = to_platram_info(dev);
dev_set_drvdata(dev, NULL);
dev_dbg(dev, "removing device\n");
if (info == NULL)
return 0;
if (info->mtd) {
#ifdef CONFIG_MTD_PARTITIONS
if (info->partitions) {
del_mtd_partitions(info->mtd);
kfree(info->partitions);
}
#endif
del_mtd_device(info->mtd);
map_destroy(info->mtd);
}
/* ensure ram is left read-only */
platram_setrw(info, PLATRAM_RO);
/* release resources */
if (info->area) {
release_resource(info->area);
kfree(info->area);
}
if (info->map.virt != NULL)
iounmap(info->map.virt);
kfree(info);
return 0;
}
/* platram_probe
*
* called from device drive system when a device matching our
* driver is found.
*/
static int platram_probe(struct device *dev)
{
struct platform_device *pd = to_platform_device(dev);
struct platdata_mtd_ram *pdata;
struct platram_info *info;
struct resource *res;
int err = 0;
dev_dbg(dev, "probe entered\n");
if (dev->platform_data == NULL) {
dev_err(dev, "no platform data supplied\n");
err = -ENOENT;
goto exit_error;
}
pdata = dev->platform_data;
info = kmalloc(sizeof(*info), GFP_KERNEL);
if (info == NULL) {
dev_err(dev, "no memory for flash info\n");
err = -ENOMEM;
goto exit_error;
}
memzero(info, sizeof(*info));
dev_set_drvdata(dev, info);
info->dev = dev;
info->pdata = pdata;
/* get the resource for the memory mapping */
res = platform_get_resource(pd, IORESOURCE_MEM, 0);
if (res == NULL) {
dev_err(dev, "no memory resource specified\n");
err = -ENOENT;
goto exit_free;
}
dev_dbg(dev, "got platform resource %p (0x%lx)\n", res, res->start);
/* setup map parameters */
info->map.phys = res->start;
info->map.size = (res->end - res->start) + 1;
info->map.name = pdata->mapname != NULL ? pdata->mapname : pd->name;
info->map.bankwidth = pdata->bankwidth;
/* register our usage of the memory area */
info->area = request_mem_region(res->start, info->map.size, pd->name);
if (info->area == NULL) {
dev_err(dev, "failed to request memory region\n");
err = -EIO;
goto exit_free;
}
/* remap the memory area */
info->map.virt = ioremap(res->start, info->map.size);
dev_dbg(dev, "virt %p, %d bytes\n", info->map.virt, info->map.size);
if (info->map.virt == NULL) {
dev_err(dev, "failed to ioremap() region\n");
err = -EIO;
goto exit_free;
}
{
unsigned int *p = (unsigned int *)info->map.virt;
printk("%08x %08x %08x %08x\n",
readl(p), readl(p+1), readl(p+2), readl(p+3));
}
simple_map_init(&info->map);
dev_dbg(dev, "initialised map, probing for mtd\n");
/* probe for the right mtd map driver */
info->mtd = do_map_probe("map_ram" , &info->map);
if (info->mtd == NULL) {
dev_err(dev, "failed to probe for map_ram\n");
err = -ENOMEM;
goto exit_free;
}
info->mtd->owner = THIS_MODULE;
platram_setrw(info, PLATRAM_RW);
/* check to see if there are any available partitions, or wether
* to add this device whole */
#ifdef CONFIG_MTD_PARTITIONS
if (pdata->nr_partitions > 0) {
const char **probes = { NULL };
if (pdata->probes)
probes = (const char **)pdata->probes;
err = parse_mtd_partitions(info->mtd, probes,
&info->partitions, 0);
if (err > 0) {
err = add_mtd_partitions(info->mtd, info->partitions,
err);
}
}
#endif /* CONFIG_MTD_PARTITIONS */
if (add_mtd_device(info->mtd)) {
dev_err(dev, "add_mtd_device() failed\n");
err = -ENOMEM;
}
dev_info(dev, "registered mtd device\n");
return err;
exit_free:
platram_remove(dev);
exit_error:
return err;
}
/* device driver info */
static struct device_driver platram_driver = {
.name = "mtd-ram",
.bus = &platform_bus_type,
.probe = platram_probe,
.remove = platram_remove,
};
/* module init/exit */
static int __init platram_init(void)
{
printk("Generic platform RAM MTD, (c) 2004 Simtec Electronics\n");
return driver_register(&platram_driver);
}
static void __exit platram_exit(void)
{
driver_unregister(&platram_driver);
}
module_init(platram_init);
module_exit(platram_exit);
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Ben Dooks <ben@simtec.co.uk>");
MODULE_DESCRIPTION("MTD platform RAM map driver");
/* linux/include/mtd/plat-ram.h
*
* (c) 2004 Simtec Electronics
* http://www.simtec.co.uk/products/SWLINUX/
* Ben Dooks <ben@simtec.co.uk>
*
* Generic platform device based RAM map
*
* $Id: plat-ram.h,v 1.2 2005/01/24 00:37:40 bjd Exp $
*
* 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.
*
*/
#ifndef __LINUX_MTD_PLATRAM_H
#define __LINUX_MTD_PLATRAM_H __FILE__
#define PLATRAM_RO (0)
#define PLATRAM_RW (1)
struct platdata_mtd_ram {
char *mapname;
char **probes;
struct mtd_partition *partitions;
int nr_partitions;
int bankwidth;
/* control callbacks */
void (*set_rw)(struct device *dev, int to);
};
#endif /* __LINUX_MTD_PLATRAM_H */
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