[MTD] Add initial support for OneNAND flash chips (cd5f6346) · Commits · jan.koester / Linux

drivers/mtd/Kconfig

+6 −4

Original line number	Original line	Diff line number	Diff line
	# $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)"		menu "Memory Technology Devices (MTD)"

	@@ -259,9 +259,9 @@ config RFD_FTL
	---help---		---help---
	This provides support for the flash translation layer known		This provides support for the flash translation layer known
	as the Resident Flash Disk (RFD), as used by the Embedded BIOS		as the Resident Flash Disk (RFD), as used by the Embedded BIOS
	of General Software.		of General Software. There is a blurb at:
	See http://www.gensw.com/pages/prod/bios/rfd.htm for further
	information.		http://www.gensw.com/pages/prod/bios/rfd.htm

	source "drivers/mtd/chips/Kconfig"		source "drivers/mtd/chips/Kconfig"

	@@ -271,5 +271,7 @@ source "drivers/mtd/devices/Kconfig"

	source "drivers/mtd/nand/Kconfig"		source "drivers/mtd/nand/Kconfig"

			source "drivers/mtd/onenand/Kconfig"

	endmenu		endmenu

drivers/mtd/Makefile

+2 −2

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	#		#
	# Makefile for the memory technology device drivers.		# 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.		# Core functionality.
	mtd-y := mtdcore.o		mtd-y := mtdcore.o
	@@ -25,4 +25,4 @@ obj-$(CONFIG_RFD_FTL) += rfd_ftl.o mtd_blkdevs.o
	nftl-objs := nftlcore.o nftlmount.o		nftl-objs := nftlcore.o nftlmount.o
	inftl-objs := inftlcore.o inftlmount.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 → 100644

+32 −0

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			#
			# 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 → 100644

+9 −0

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			#
			# 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 → 100644

+178 −0

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			/*
			* 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");