300 lines
6.7 KiB
C
300 lines
6.7 KiB
C
/* 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
|
|
*
|
|
* 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 <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;
|
|
bool free_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 platform_device *dev)
|
|
{
|
|
return (struct platram_info *)platform_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 platform_device *pdev)
|
|
{
|
|
struct platram_info *info = to_platram_info(pdev);
|
|
|
|
platform_set_drvdata(pdev, NULL);
|
|
|
|
dev_dbg(&pdev->dev, "removing device\n");
|
|
|
|
if (info == NULL)
|
|
return 0;
|
|
|
|
if (info->mtd) {
|
|
#ifdef CONFIG_MTD_PARTITIONS
|
|
if (info->partitions) {
|
|
del_mtd_partitions(info->mtd);
|
|
if (info->free_partitions)
|
|
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 platform_device *pdev)
|
|
{
|
|
struct platdata_mtd_ram *pdata;
|
|
struct platram_info *info;
|
|
struct resource *res;
|
|
int err = 0;
|
|
|
|
dev_dbg(&pdev->dev, "probe entered\n");
|
|
|
|
if (pdev->dev.platform_data == NULL) {
|
|
dev_err(&pdev->dev, "no platform data supplied\n");
|
|
err = -ENOENT;
|
|
goto exit_error;
|
|
}
|
|
|
|
pdata = pdev->dev.platform_data;
|
|
|
|
info = kzalloc(sizeof(*info), GFP_KERNEL);
|
|
if (info == NULL) {
|
|
dev_err(&pdev->dev, "no memory for flash info\n");
|
|
err = -ENOMEM;
|
|
goto exit_error;
|
|
}
|
|
|
|
platform_set_drvdata(pdev, info);
|
|
|
|
info->dev = &pdev->dev;
|
|
info->pdata = pdata;
|
|
|
|
/* get the resource for the memory mapping */
|
|
|
|
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
|
|
|
|
if (res == NULL) {
|
|
dev_err(&pdev->dev, "no memory resource specified\n");
|
|
err = -ENOENT;
|
|
goto exit_free;
|
|
}
|
|
|
|
dev_dbg(&pdev->dev, "got platform resource %p (0x%llx)\n", res,
|
|
(unsigned long long)res->start);
|
|
|
|
/* setup map parameters */
|
|
|
|
info->map.phys = res->start;
|
|
info->map.size = (res->end - res->start) + 1;
|
|
info->map.name = pdata->mapname != NULL ?
|
|
(char *)pdata->mapname : (char *)pdev->name;
|
|
info->map.bankwidth = pdata->bankwidth;
|
|
|
|
/* register our usage of the memory area */
|
|
|
|
info->area = request_mem_region(res->start, info->map.size, pdev->name);
|
|
if (info->area == NULL) {
|
|
dev_err(&pdev->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(&pdev->dev, "virt %p, %lu bytes\n", info->map.virt, info->map.size);
|
|
|
|
if (info->map.virt == NULL) {
|
|
dev_err(&pdev->dev, "failed to ioremap() region\n");
|
|
err = -EIO;
|
|
goto exit_free;
|
|
}
|
|
|
|
simple_map_init(&info->map);
|
|
|
|
dev_dbg(&pdev->dev, "initialised map, probing for mtd\n");
|
|
|
|
/* probe for the right mtd map driver
|
|
* supplied by the platform_data struct */
|
|
|
|
if (pdata->map_probes) {
|
|
const char **map_probes = pdata->map_probes;
|
|
|
|
for ( ; !info->mtd && *map_probes; map_probes++)
|
|
info->mtd = do_map_probe(*map_probes , &info->map);
|
|
}
|
|
/* fallback to map_ram */
|
|
else
|
|
info->mtd = do_map_probe("map_ram", &info->map);
|
|
|
|
if (info->mtd == NULL) {
|
|
dev_err(&pdev->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) {
|
|
/* try to probe using the supplied probe type */
|
|
if (pdata->probes) {
|
|
err = parse_mtd_partitions(info->mtd, pdata->probes,
|
|
&info->partitions, 0);
|
|
info->free_partitions = 1;
|
|
if (err > 0)
|
|
err = add_mtd_partitions(info->mtd,
|
|
info->partitions, err);
|
|
}
|
|
}
|
|
/* use the static mapping */
|
|
else
|
|
err = add_mtd_partitions(info->mtd, pdata->partitions,
|
|
pdata->nr_partitions);
|
|
#endif /* CONFIG_MTD_PARTITIONS */
|
|
|
|
if (add_mtd_device(info->mtd)) {
|
|
dev_err(&pdev->dev, "add_mtd_device() failed\n");
|
|
err = -ENOMEM;
|
|
}
|
|
|
|
if (!err)
|
|
dev_info(&pdev->dev, "registered mtd device\n");
|
|
|
|
return err;
|
|
|
|
exit_free:
|
|
platram_remove(pdev);
|
|
exit_error:
|
|
return err;
|
|
}
|
|
|
|
/* device driver info */
|
|
|
|
/* work with hotplug and coldplug */
|
|
MODULE_ALIAS("platform:mtd-ram");
|
|
|
|
static struct platform_driver platram_driver = {
|
|
.probe = platram_probe,
|
|
.remove = platram_remove,
|
|
.driver = {
|
|
.name = "mtd-ram",
|
|
.owner = THIS_MODULE,
|
|
},
|
|
};
|
|
|
|
/* module init/exit */
|
|
|
|
static int __init platram_init(void)
|
|
{
|
|
printk("Generic platform RAM MTD, (c) 2004 Simtec Electronics\n");
|
|
return platform_driver_register(&platram_driver);
|
|
}
|
|
|
|
static void __exit platram_exit(void)
|
|
{
|
|
platform_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");
|