[MTD] Add initial support for OneNAND flash chips

OneNAND is a new flash technology from Samsung with integrated SRAM
buffers and logic interface.

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

drivers/mtd/Kconfig

@@ -1,4 +1,4 @@
-# $Id: Kconfig,v 1.9 2005/06/16 08:49:29 sean Exp $
+# $Id: Kconfig,v 1.10 2005/07/11 10:39:27 gleixner Exp $
 
 menu "Memory Technology Devices (MTD)"
 
@@ -259,9 +259,9 @@ config RFD_FTL
 	---help---
 	  This provides support for the flash translation layer known 
 	  as the Resident Flash Disk (RFD), as used by the Embedded BIOS 
-	  of General Software.
-	  See http://www.gensw.com/pages/prod/bios/rfd.htm for further
-	  information.
+	  of General Software. There is a blurb at:
+
+		http://www.gensw.com/pages/prod/bios/rfd.htm
 
 source "drivers/mtd/chips/Kconfig"
 
@@ -271,5 +271,7 @@ source "drivers/mtd/devices/Kconfig"
 
 source "drivers/mtd/nand/Kconfig"
 
+source "drivers/mtd/onenand/Kconfig"
+
 endmenu
 

drivers/mtd/Makefile

@@ -1,7 +1,7 @@
 #
 # Makefile for the memory technology device drivers.
 #
-# $Id: Makefile.common,v 1.6 2005/06/16 08:49:29 sean Exp $
+# $Id: Makefile.common,v 1.7 2005/07/11 10:39:27 gleixner Exp $
 
 # Core functionality.
 mtd-y				:= mtdcore.o
@@ -25,4 +25,4 @@ obj-$(CONFIG_RFD_FTL)		+= rfd_ftl.o mtd_blkdevs.o
 nftl-objs		:= nftlcore.o nftlmount.o
 inftl-objs		:= inftlcore.o inftlmount.o
 
-obj-y		+= chips/ maps/ devices/ nand/
+obj-y		+= chips/ maps/ devices/ nand/ onenand/

drivers/mtd/onenand/Kconfig

@@ -0,0 +1,32 @@
+#
+# linux/drivers/mtd/onenand/Kconfig
+#
+
+menu "OneNAND Flash Device Drivers (EXPERIMENTAL)"
+	depends on MTD != n && EXPERIMENTAL
+
+config MTD_ONENAND
+	tristate "OneNAND Device Support"
+	depends on MTD
+	help
+	  This enables support for accessing all type of OneNAND flash
+	  devices. For further information see
+	  <http://www.samsung.com/Products/Semiconductor/Flash/OneNAND_TM/index.htm>.
+
+config MTD_ONENAND_VERIFY_WRITE
+	bool "Verify OneNAND page writes"
+	depends on MTD_ONENAND
+	help
+	  This adds an extra check when data is written to the flash. The
+	  OneNAND flash device internally checks only bits transitioning
+	  from 1 to 0. There is a rare possibility that even though the
+	  device thinks the write was successful, a bit could have been
+	  flipped accidentaly due to device wear or something else.
+
+config MTD_ONENAND_OMAP
+	tristate "OneNAND Flash device on OMAP board"
+	depends on ARCH_OMAP && MTD_ONENAND
+	help
+	  Support for OneNAND flash on TI OMAP board.
+
+endmenu

drivers/mtd/onenand/Makefile

@@ -0,0 +1,9 @@
+#
+# Makefile for the OneNAND MTD
+#
+
+# Core functionality.
+obj-$(CONFIG_MTD_ONENAND)		+= onenand_base.o
+
+# Board specific.
+obj-$(CONFIG_MTD_ONENAND_OMAP)		+= omap-onenand.o

drivers/mtd/onenand/omap-onenand.c

@@ -0,0 +1,178 @@
+/*
+ *  linux/drivers/mtd/onenand/omap-onenand.c
+ *
+ *  Copyright (c) 2005 Samsung Electronics
+ *  Kyungmin Park <kyungmin.park@samsung.com>
+ *
+ *  Derived from linux/drivers/mtd/nand/omap-nand-flash.c
+ *
+ * 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 device for TI OMAP boards.
+ */
+
+#include <linux/slab.h>
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/mtd/mtd.h>
+#include <linux/mtd/onenand.h>
+#include <linux/mtd/partitions.h>
+
+#include <asm/io.h>
+#include <asm/arch/hardware.h>
+#include <asm/arch/tc.h>
+#include <asm/sizes.h>
+
+#define OMAP_ONENAND_FLASH_START1	OMAP_CS2A_PHYS
+#define OMAP_ONENAND_FLASH_START2	OMAP_CS0_PHYS
+/*
+ * MTD structure for OMAP board
+ */
+static struct mtd_info *omap_onenand_mtd = NULL;
+
+/*
+ * Define partitions for flash devices
+ */
+
+#ifdef CONFIG_MTD_PARTITIONS
+static struct mtd_partition static_partition[] = {
+	{
+		.name		= "X-Loader + U-Boot",
+		.offset		= 0,
+		.size		= SZ_128K,
+		.mask_flags	= MTD_WRITEABLE	/* force read-only */
+ 	},
+	{
+		.name		= "U-Boot Environment",
+		.offset		= MTDPART_OFS_APPEND,
+		.size		= SZ_128K,
+		.mask_flags	= MTD_WRITEABLE	/* force read-only */
+ 	},
+	{
+		.name		= "kernel",
+		.offset		= MTDPART_OFS_APPEND,
+		.size		= 2 * SZ_1M
+	},
+	{
+		.name		= "filesystem0",
+		.offset		= MTDPART_OFS_APPEND,
+		.size		= SZ_16M,
+	},
+	{
+		.name		= "filesystem1",
+		.offset		= MTDPART_OFS_APPEND,
+		.size		= MTDPART_SIZ_FULL,
+	},
+};
+
+const char *part_probes[] = { "cmdlinepart", NULL,  };
+
+#endif
+
+/* Scan to find existance of the device at base.
+   This also allocates oob and data internal buffers */
+static char onenand_name[] = "onenand";
+
+/*
+ * Main initialization routine
+ */
+static int __init omap_onenand_init (void)
+{
+	struct onenand_chip *this;
+	struct mtd_partition *dynamic_partition = 0;
+	int err = 0;
+
+	/* Allocate memory for MTD device structure and private data */
+	omap_onenand_mtd = kmalloc (sizeof(struct mtd_info) + sizeof (struct onenand_chip),
+				GFP_KERNEL);
+	if (!omap_onenand_mtd) {
+		printk (KERN_WARNING "Unable to allocate OneNAND MTD device structure.\n");
+		err = -ENOMEM;
+		goto out;
+	}
+
+	/* Get pointer to private data */
+	this = (struct onenand_chip *) (&omap_onenand_mtd[1]);
+
+	/* Initialize structures */
+	memset((char *) omap_onenand_mtd, 0, sizeof(struct mtd_info) + sizeof(struct onenand_chip));
+
+	/* Link the private data with the MTD structure */
+	omap_onenand_mtd->priv = this;
+
+        /* try the first address */
+	this->base = ioremap(OMAP_ONENAND_FLASH_START1, SZ_128K);
+	omap_onenand_mtd->name = onenand_name;
+	if (onenand_scan(omap_onenand_mtd, 1)){
+		/* try the second address */
+		iounmap(this->base);
+		this->base = ioremap(OMAP_ONENAND_FLASH_START2, SZ_128K);
+		if (onenand_scan(omap_onenand_mtd, 1)) {
+			iounmap(this->base);
+                        err = -ENXIO;
+                        goto out_mtd;
+		}
+	}
+
+	/* Register the partitions */
+	switch (omap_onenand_mtd->size) {
+	case SZ_128M:
+	case SZ_64M:
+	case SZ_32M:
+#ifdef CONFIG_MTD_PARTITIONS
+		err = parse_mtd_partitions(omap_onenand_mtd, part_probes,
+					&dynamic_partition, 0);
+		if (err > 0)
+			err = add_mtd_partitions(omap_onenand_mtd,
+					dynamic_partition, err);
+		else if (1)
+			err = add_mtd_partitions(omap_onenand_mtd,
+					static_partition,
+					ARRAY_SIZE(static_partition));
+		else
+#endif
+			err = add_mtd_device(omap_onenand_mtd);
+		if (err)
+			goto out_buf;
+		break;
+
+	default:
+		printk(KERN_WARNING "Unsupported OneNAND device\n");
+		err = -ENXIO;
+		goto out_buf;
+	}
+
+	return 0;
+
+out_buf:
+	onenand_release(omap_onenand_mtd);
+	iounmap(this->base);
+out_mtd:
+	kfree(omap_onenand_mtd);
+out:
+	return err;
+}
+
+/*
+ * Clean up routine
+ */
+static void __exit omap_onenand_cleanup (void)
+{
+	struct onenand_chip *this = omap_onenand_mtd->priv;
+
+	/* onenand_release frees MTD partitions, MTD structure
+	   and onenand internal buffers */
+	onenand_release(omap_onenand_mtd);
+	iounmap(this->base);
+	kfree(omap_onenand_mtd);
+}
+
+module_init(omap_onenand_init);
+module_exit(omap_onenand_cleanup);
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Kyungmin Park <kyungmin.park@samsung.com>");
+MODULE_DESCRIPTION("Glue layer for OneNAND flash on OMAP boards");