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- /* 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 platform 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/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 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 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);
- dev_dbg(&pdev->dev, "removing device\n");
- if (info == NULL)
- return 0;
- if (info->mtd) {
- mtd_device_unregister(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 (dev_get_platdata(&pdev->dev) == NULL) {
- dev_err(&pdev->dev, "no platform data supplied\n");
- err = -ENOENT;
- goto exit_error;
- }
- pdata = dev_get_platdata(&pdev->dev);
- info = kzalloc(sizeof(*info), GFP_KERNEL);
- if (info == NULL) {
- 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 = resource_size(res);
- 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 * const *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->dev.parent = &pdev->dev;
- platram_setrw(info, PLATRAM_RW);
- /* check to see if there are any available partitions, or whether
- * to add this device whole */
- err = mtd_device_parse_register(info->mtd, pdata->probes, NULL,
- pdata->partitions,
- pdata->nr_partitions);
- if (!err)
- dev_info(&pdev->dev, "registered mtd device\n");
- if (pdata->nr_partitions) {
- /* add the whole device. */
- err = mtd_device_register(info->mtd, NULL, 0);
- if (err) {
- dev_err(&pdev->dev,
- "failed to register the entire 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",
- },
- };
- module_platform_driver(platram_driver);
- MODULE_LICENSE("GPL");
- MODULE_AUTHOR("Ben Dooks <ben@simtec.co.uk>");
- MODULE_DESCRIPTION("MTD platform RAM map driver");
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