[MTD] Add initial support for OneNAND flash chips (cd5f6346) · Commits · e / devices / android_kernel_xiaomi_markw

drivers/mtd/Kconfig

+6 −4

Original line number	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)"

		@@ -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

+2 −2

Original line number	Diff line number	Diff line
		#
		# 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 → 100644

+32 −0

Original line number	Diff line number	Diff line
		#
		# 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

Original line number	Diff line number	Diff line
		#
		# 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

Original line number	Diff line number	Diff line
		/*
		* 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");