281 lines
6.2 KiB
C
281 lines
6.2 KiB
C
/* drivers/mtd/maps/plat-ram.c
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*
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* (c) 2004-2005 Simtec Electronics
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* http://www.simtec.co.uk/products/SWLINUX/
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* Ben Dooks <ben@simtec.co.uk>
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*
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* Generic platfrom device based RAM map
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*
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* $Id: plat-ram.c,v 1.3 2005/03/19 22:41:27 gleixner Exp $
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include <linux/module.h>
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#include <linux/types.h>
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#include <linux/init.h>
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#include <linux/kernel.h>
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#include <linux/string.h>
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#include <linux/ioport.h>
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#include <linux/device.h>
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#include <linux/slab.h>
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#include <linux/platform_device.h>
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#include <linux/mtd/mtd.h>
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#include <linux/mtd/map.h>
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#include <linux/mtd/partitions.h>
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#include <linux/mtd/plat-ram.h>
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#include <asm/io.h>
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/* private structure for each mtd platform ram device created */
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struct platram_info {
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struct device *dev;
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struct mtd_info *mtd;
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struct map_info map;
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struct mtd_partition *partitions;
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struct resource *area;
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struct platdata_mtd_ram *pdata;
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};
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/* to_platram_info()
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*
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* device private data to struct platram_info conversion
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*/
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static inline struct platram_info *to_platram_info(struct device *dev)
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{
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return (struct platram_info *)dev_get_drvdata(dev);
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}
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/* platram_setrw
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*
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* call the platform device's set rw/ro control
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*
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* to = 0 => read-only
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* = 1 => read-write
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*/
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static inline void platram_setrw(struct platram_info *info, int to)
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{
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if (info->pdata == NULL)
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return;
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if (info->pdata->set_rw != NULL)
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(info->pdata->set_rw)(info->dev, to);
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}
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/* platram_remove
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*
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* called to remove the device from the driver's control
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*/
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static int platram_remove(struct device *dev)
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{
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struct platram_info *info = to_platram_info(dev);
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dev_set_drvdata(dev, NULL);
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dev_dbg(dev, "removing device\n");
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if (info == NULL)
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return 0;
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if (info->mtd) {
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#ifdef CONFIG_MTD_PARTITIONS
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if (info->partitions) {
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del_mtd_partitions(info->mtd);
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kfree(info->partitions);
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}
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#endif
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del_mtd_device(info->mtd);
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map_destroy(info->mtd);
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}
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/* ensure ram is left read-only */
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platram_setrw(info, PLATRAM_RO);
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/* release resources */
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if (info->area) {
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release_resource(info->area);
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kfree(info->area);
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}
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if (info->map.virt != NULL)
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iounmap(info->map.virt);
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kfree(info);
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return 0;
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}
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/* platram_probe
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*
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* called from device drive system when a device matching our
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* driver is found.
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*/
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static int platram_probe(struct device *dev)
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{
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struct platform_device *pd = to_platform_device(dev);
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struct platdata_mtd_ram *pdata;
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struct platram_info *info;
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struct resource *res;
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int err = 0;
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dev_dbg(dev, "probe entered\n");
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if (dev->platform_data == NULL) {
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dev_err(dev, "no platform data supplied\n");
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err = -ENOENT;
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goto exit_error;
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}
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pdata = dev->platform_data;
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info = kmalloc(sizeof(*info), GFP_KERNEL);
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if (info == NULL) {
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dev_err(dev, "no memory for flash info\n");
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err = -ENOMEM;
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goto exit_error;
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}
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memset(info, 0, sizeof(*info));
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dev_set_drvdata(dev, info);
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info->dev = dev;
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info->pdata = pdata;
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/* get the resource for the memory mapping */
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res = platform_get_resource(pd, IORESOURCE_MEM, 0);
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if (res == NULL) {
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dev_err(dev, "no memory resource specified\n");
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err = -ENOENT;
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goto exit_free;
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}
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dev_dbg(dev, "got platform resource %p (0x%lx)\n", res, res->start);
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/* setup map parameters */
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info->map.phys = res->start;
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info->map.size = (res->end - res->start) + 1;
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info->map.name = pdata->mapname != NULL ? pdata->mapname : pd->name;
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info->map.bankwidth = pdata->bankwidth;
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/* register our usage of the memory area */
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info->area = request_mem_region(res->start, info->map.size, pd->name);
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if (info->area == NULL) {
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dev_err(dev, "failed to request memory region\n");
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err = -EIO;
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goto exit_free;
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}
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/* remap the memory area */
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info->map.virt = ioremap(res->start, info->map.size);
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dev_dbg(dev, "virt %p, %lu bytes\n", info->map.virt, info->map.size);
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if (info->map.virt == NULL) {
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dev_err(dev, "failed to ioremap() region\n");
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err = -EIO;
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goto exit_free;
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}
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simple_map_init(&info->map);
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dev_dbg(dev, "initialised map, probing for mtd\n");
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/* probe for the right mtd map driver */
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info->mtd = do_map_probe("map_ram" , &info->map);
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if (info->mtd == NULL) {
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dev_err(dev, "failed to probe for map_ram\n");
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err = -ENOMEM;
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goto exit_free;
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}
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info->mtd->owner = THIS_MODULE;
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platram_setrw(info, PLATRAM_RW);
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/* check to see if there are any available partitions, or wether
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* to add this device whole */
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#ifdef CONFIG_MTD_PARTITIONS
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if (pdata->nr_partitions > 0) {
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const char **probes = { NULL };
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if (pdata->probes)
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probes = (const char **)pdata->probes;
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err = parse_mtd_partitions(info->mtd, probes,
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&info->partitions, 0);
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if (err > 0) {
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err = add_mtd_partitions(info->mtd, info->partitions,
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err);
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}
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}
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#endif /* CONFIG_MTD_PARTITIONS */
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if (add_mtd_device(info->mtd)) {
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dev_err(dev, "add_mtd_device() failed\n");
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err = -ENOMEM;
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}
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dev_info(dev, "registered mtd device\n");
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return err;
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exit_free:
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platram_remove(dev);
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exit_error:
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return err;
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}
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/* device driver info */
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static struct device_driver platram_driver = {
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.name = "mtd-ram",
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.bus = &platform_bus_type,
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.probe = platram_probe,
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.remove = platram_remove,
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};
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/* module init/exit */
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static int __init platram_init(void)
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{
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printk("Generic platform RAM MTD, (c) 2004 Simtec Electronics\n");
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return driver_register(&platram_driver);
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}
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static void __exit platram_exit(void)
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{
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driver_unregister(&platram_driver);
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}
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module_init(platram_init);
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module_exit(platram_exit);
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MODULE_LICENSE("GPL");
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MODULE_AUTHOR("Ben Dooks <ben@simtec.co.uk>");
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MODULE_DESCRIPTION("MTD platform RAM map driver");
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