/* 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 1.3 2005/03/19 22:41:27 gleixner 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/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;	}	memset(info, 0, 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, %lu 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;	}	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");