[MTD] OneNAND: Add generic platform driver

Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

drivers/mtd/onenand/Kconfig

@@ -23,6 +23,13 @@ config MTD_ONENAND_VERIFY_WRITE
 	  device thinks the write was successful, a bit could have been
 	  flipped accidentaly due to device wear or something else.
 
+config MTD_ONENAND_GENERIC
+	tristate "OneNAND Flash device on generic board"
+	depends on MTD_ONENAND
+	help
+	  Support for OneNAND flash on generic board. Using device driver
+	  framework, now all most platfrom are support.
+
 config MTD_ONENAND_OMAP
 	tristate "OneNAND Flash device on OMAP board"
 	depends on ARCH_OMAP && MTD_ONENAND

drivers/mtd/onenand/Makefile

@@ -6,6 +6,7 @@
 obj-$(CONFIG_MTD_ONENAND)		+= onenand.o
 
 # Board specific.
+obj-$(CONFIG_MTD_ONENAND_GENERIC)	+= generic.o
 obj-$(CONFIG_MTD_ONENAND_OMAP)		+= omap-onenand.o
 
 # Simulator

drivers/mtd/onenand/generic.c

+/*
+ *  linux/drivers/mtd/onenand/generic.c
+ *
+ *  Copyright (c) 2005 Samsung Electronics
+ *  Kyungmin Park <kyungmin.park@samsung.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ *  Overview:
+ *   This is a device driver for the OneNAND flash for generic boards.
+ */
+
+#include <linux/device.h>
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/mtd/mtd.h>
+#include <linux/mtd/onenand.h>
+#include <linux/mtd/partitions.h>
+
+#include <asm/io.h>
+#include <asm/mach/flash.h>
+
+#define DRIVER_NAME	"onenand"
+
+
+#ifdef CONFIG_MTD_PARTITIONS
+static const char *part_probes[] = { "cmdlinepart", NULL,  };
+#endif
+
+struct onenand_info {
+	struct mtd_info		mtd;
+	struct mtd_partition	*parts;
+	struct onenand_chip	onenand;
+};
+
+static int __devinit generic_onenand_probe(struct device *dev)
+{
+	struct onenand_info *info;
+	struct platform_device *pdev = to_platform_device(dev);
+	struct onenand_platform_data *pdata = pdev->dev.platform_data;
+	struct resource *res = pdev->resource;
+	unsigned long size = res->end - res->start + 1;
+	int err;
+
+	info = kmalloc(sizeof(struct onenand_info), GFP_KERNEL);
+	if (!info)
+		return -ENOMEM;
+
+	memset(info, 0, sizeof(struct onenand_info));
+
+	if (!request_mem_region(res->start, size, dev->driver->name)) {
+		err = -EBUSY;
+		goto out_free_info;
+	}
+
+	info->onenand.base = ioremap(res->start, size);
+	if (!info->onenand.base) {
+		err = -ENOMEM;
+		goto out_release_mem_region;
+	}
+
+	info->onenand.mmcontrol = pdata->mmcontrol;
+
+	info->mtd.name = pdev->dev.bus_id;
+	info->mtd.priv = &info->onenand;
+	info->mtd.owner = THIS_MODULE;
+
+	if (onenand_scan(&info->mtd, 1)) {
+		err = -ENXIO;
+		goto out_iounmap;
+	}
+
+#ifdef CONFIG_MTD_PARTITIONS
+	err = parse_mtd_partitions(&info->mtd, part_probes, &info->parts, 0);
+	if (err > 0)
+		add_mtd_partitions(&info->mtd, info->parts, err);
+	else if (err < 0 && pdata->parts)
+		add_mtd_partitions(&info->mtd, pdata->parts, pdata->nr_parts);
+	else
+#endif
+		err = add_mtd_device(&info->mtd);
+
+	dev_set_drvdata(&pdev->dev, info);
+
+	return 0;
+
+out_iounmap:
+	iounmap(info->onenand.base);
+out_release_mem_region:
+	release_mem_region(res->start, size);
+out_free_info:
+	kfree(info);
+
+	return err;
+}
+
+static int __devexit generic_onenand_remove(struct device *dev)
+{
+	struct platform_device *pdev = to_platform_device(dev);
+	struct onenand_info *info = dev_get_drvdata(&pdev->dev);
+	struct resource *res = pdev->resource;
+	unsigned long size = res->end - res->start + 1;
+
+	dev_set_drvdata(&pdev->dev, NULL);
+
+	if (info) {
+		if (info->parts)
+			del_mtd_partitions(&info->mtd);
+		else
+			del_mtd_device(&info->mtd);
+
+		onenand_release(&info->mtd);
+		release_mem_region(res->start, size);
+		iounmap(info->onenand.base);
+		kfree(info);
+	}
+
+	return 0;
+}
+
+static struct device_driver generic_onenand_driver = {
+	.name		= DRIVER_NAME,
+	.bus		= &platform_bus_type,
+	.probe		= generic_onenand_probe,
+	.remove		= __devexit_p(generic_onenand_remove),
+};
+
+MODULE_ALIAS(DRIVER_NAME);
+
+static int __init generic_onenand_init(void)
+{
+	return driver_register(&generic_onenand_driver);
+}
+
+static void __exit generic_onenand_exit(void)
+{
+	driver_unregister(&generic_onenand_driver);
+}
+
+module_init(generic_onenand_init);
+module_exit(generic_onenand_exit);
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Kyungmin Park <kyungmin.park@samsung.com>");
+MODULE_DESCRIPTION("Glue layer for OneNAND flash on generic boards");