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@@ -0,0 +1,286 @@
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+/* 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 1.1 2005/01/24 00:37:02 bjd 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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+
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+#define DEBUG
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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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+
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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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+
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+#include <asm/io.h>
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+
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+/* private structure for each mtd platform ram device created */
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+
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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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+
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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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+
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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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+
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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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+
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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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+
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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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+
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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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+
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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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+
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+ dev_set_drvdata(dev, NULL);
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+
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+ dev_dbg(dev, "removing device\n");
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+
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+ if (info == NULL)
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+ return 0;
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+
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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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+
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+ /* ensure ram is left read-only */
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+
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+ platram_setrw(info, PLATRAM_RO);
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+
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+ /* release resources */
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+
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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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+
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+ if (info->map.virt != NULL)
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+ iounmap(info->map.virt);
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+
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+ kfree(info);
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+
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+ return 0;
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+}
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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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+
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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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+
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+ dev_dbg(dev, "probe entered\n");
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+
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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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+
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+ pdata = dev->platform_data;
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+
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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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+
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+ memzero(info, sizeof(*info));
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+ dev_set_drvdata(dev, info);
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+
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+ info->dev = dev;
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+ info->pdata = pdata;
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+
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+ /* get the resource for the memory mapping */
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+
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+ res = platform_get_resource(pd, IORESOURCE_MEM, 0);
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+
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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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+
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+ dev_dbg(dev, "got platform resource %p (0x%lx)\n", res, res->start);
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+
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+ /* setup map parameters */
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+
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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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+
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+ /* register our usage of the memory area */
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+
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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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+
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+ /* remap the memory area */
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+
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+ info->map.virt = ioremap(res->start, info->map.size);
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+ dev_dbg(dev, "virt %p, %d bytes\n", info->map.virt, info->map.size);
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+
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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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+
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+ {
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+ unsigned int *p = (unsigned int *)info->map.virt;
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+ printk("%08x %08x %08x %08x\n",
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+ readl(p), readl(p+1), readl(p+2), readl(p+3));
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+ }
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+
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+ simple_map_init(&info->map);
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+
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+ dev_dbg(dev, "initialised map, probing for mtd\n");
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+
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+ /* probe for the right mtd map driver */
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+
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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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+
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+ info->mtd->owner = THIS_MODULE;
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+
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+ platram_setrw(info, PLATRAM_RW);
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+
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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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+
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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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+
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+ if (pdata->probes)
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+ probes = (const char **)pdata->probes;
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+
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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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+
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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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+
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+ dev_info(dev, "registered mtd device\n");
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+ return err;
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+
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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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+
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+/* device driver info */
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+
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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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+
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+/* module init/exit */
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+
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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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+
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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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+
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+module_init(platram_init);
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+module_exit(platram_exit);
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+
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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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Ben Dooks