/* drivers/mtd/maps/plat-ram.c * * (c) 2004-2005 Simtec Electronics * http://www.simtec.co.uk/products/SWLINUX/ * Ben Dooks * * 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 #include #include #include #include #include #include #include #include #include #include #include #include /* 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) { 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 = 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->owner = THIS_MODULE; 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", .owner = THIS_MODULE, }, }; module_platform_driver(platram_driver); MODULE_LICENSE("GPL"); MODULE_AUTHOR("Ben Dooks "); MODULE_DESCRIPTION("MTD platform RAM map driver");