[MTD] OneNAND: Add generic platform driver

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

1 files changed, 147 insertions, 0 deletions

diff --git a/drivers/mtd/onenand/generic.c b/drivers/mtd/onenand/generic.c
new file mode 100644
index 000000000000..48cce431f89f
--- /dev/null
+++ b/drivers/mtd/onenand/generic.c
@@ -0,0 +1,147 @@
+/*
+ *  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");