[MTD] [NAND] eXcite nand flash driver (67a9c7af) · Commits · e / devices / android_kernel_oneplus_sm8150

drivers/mtd/nand/Kconfig

+8 −0

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		@@ -217,6 +217,14 @@ config MTD_NAND_SHARPSL
		tristate "Support for NAND Flash on Sharp SL Series (C7xx + others)"
		depends on MTD_NAND && ARCH_PXA

		config MTD_NAND_BASLER_EXCITE
		tristate "Support for NAND Flash on Basler eXcite"
		depends on MTD_NAND && BASLER_EXCITE
		help
		This enables the driver for the NAND flash device found on the
		Basler eXcite Smart Camera. If built as a module, the driver
		will be named "excite_nandflash.ko".

		config MTD_NAND_CAFE
		tristate "NAND support for OLPC CAFÉ chip"
		depends on MTD_NAND && PCI

drivers/mtd/nand/Makefile

+1 −0

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		@@ -24,6 +24,7 @@ obj-$(CONFIG_MTD_NAND_NANDSIM) += nandsim.o
		obj-$(CONFIG_MTD_NAND_CS553X) += cs553x_nand.o
		obj-$(CONFIG_MTD_NAND_NDFC) += ndfc.o
		obj-$(CONFIG_MTD_NAND_AT91) += at91_nand.o
		obj-$(CONFIG_MTD_NAND_BASLER_EXCITE) += excite_nandflash.o

		nand-objs := nand_base.o nand_bbt.o
		cafe_nand-objs := cafe.o cafe_ecc.o

drivers/mtd/nand/excite_nandflash.c

0 → 100644

+248 −0

Original line number	Diff line number	Diff line
		/*
		* Copyright (C) 2005 - 2007 by Basler Vision Technologies AG
		* Author: Thomas Koeller <thomas.koeller.qbaslerweb.com>
		* Original code by Thies Moeller <thies.moeller@baslerweb.com>
		*
		* This program is free software; you can redistribute it and/or modify
		* it under the terms of the GNU General Public License as published by
		* the Free Software Foundation; either version 2 of the License, or
		* (at your option) any later version.
		*
		* This program is distributed in the hope that it will be useful,
		* but WITHOUT ANY WARRANTY; without even the implied warranty of
		* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
		* GNU General Public License for more details.
		*
		* You should have received a copy of the GNU General Public License
		* along with this program; if not, write to the Free Software
		* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
		*/

		#include <linux/module.h>
		#include <linux/types.h>
		#include <linux/init.h>
		#include <linux/kernel.h>
		#include <linux/string.h>
		#include <linux/ioport.h>
		#include <linux/platform_device.h>
		#include <linux/delay.h>
		#include <linux/err.h>
		#include <linux/kernel.h>

		#include <linux/mtd/mtd.h>
		#include <linux/mtd/nand.h>
		#include <linux/mtd/nand_ecc.h>
		#include <linux/mtd/partitions.h>

		#include <asm/io.h>
		#include <asm/rm9k-ocd.h>

		#include <excite_nandflash.h>

		#define EXCITE_NANDFLASH_VERSION "0.1"

		/* I/O register offsets */
		#define EXCITE_NANDFLASH_DATA_BYTE 0x00
		#define EXCITE_NANDFLASH_STATUS_BYTE 0x0c
		#define EXCITE_NANDFLASH_ADDR_BYTE 0x10
		#define EXCITE_NANDFLASH_CMD_BYTE 0x14

		/* prefix for debug output */
		static const char module_id[] = "excite_nandflash";

		/*
		* partition definition
		*/
		static const struct mtd_partition partition_info[] = {
		{
		.name = "eXcite RootFS",
		.offset = 0,
		.size = MTDPART_SIZ_FULL
		}
		};

		static inline const struct resource *
		excite_nand_get_resource(struct platform_device *d, unsigned long flags,
		const char *basename)
		{
		char buf[80];

		if (snprintf(buf, sizeof buf, "%s_%u", basename, d->id) >= sizeof buf)
		return NULL;
		return platform_get_resource_byname(d, flags, buf);
		}

		static inline void __iomem *
		excite_nand_map_regs(struct platform_device d, const char basename)
		{
		void *result = NULL;
		const struct resource *const r =
		excite_nand_get_resource(d, IORESOURCE_MEM, basename);

		if (r)
		result = ioremap_nocache(r->start, r->end + 1 - r->start);
		return result;
		}

		/* controller and mtd information */
		struct excite_nand_drvdata {
		struct mtd_info board_mtd;
		struct nand_chip board_chip;
		void __iomem *regs;
		void __iomem *tgt;
		};

		/* Control function */
		static void excite_nand_control(struct mtd_info *mtd, int cmd,
		unsigned int ctrl)
		{
		struct excite_nand_drvdata * const d =
		container_of(mtd, struct excite_nand_drvdata, board_mtd);

		switch (ctrl) {
		case NAND_CTRL_CHANGE \| NAND_CTRL_CLE:
		d->tgt = d->regs + EXCITE_NANDFLASH_CMD_BYTE;
		break;
		case NAND_CTRL_CHANGE \| NAND_CTRL_ALE:
		d->tgt = d->regs + EXCITE_NANDFLASH_ADDR_BYTE;
		break;
		case NAND_CTRL_CHANGE \| NAND_NCE:
		d->tgt = d->regs + EXCITE_NANDFLASH_DATA_BYTE;
		break;
		}

		if (cmd != NAND_CMD_NONE)
		__raw_writeb(cmd, d->tgt);
		}

		/* Return 0 if flash is busy, 1 if ready */
		static int excite_nand_devready(struct mtd_info *mtd)
		{
		struct excite_nand_drvdata * const drvdata =
		container_of(mtd, struct excite_nand_drvdata, board_mtd);

		return __raw_readb(drvdata->regs + EXCITE_NANDFLASH_STATUS_BYTE);
		}

		/*
		* Called by device layer to remove the driver.
		* The binding to the mtd and all allocated
		* resources are released.
		*/
		static int __exit excite_nand_remove(struct device *dev)
		{
		struct excite_nand_drvdata * const this = dev_get_drvdata(dev);

		dev_set_drvdata(dev, NULL);

		if (unlikely(!this)) {
		printk(KERN_ERR "%s: called %s without private data!!",
		module_id, __func__);
		return -EINVAL;
		}

		/* first thing we need to do is release our mtd
		* then go through freeing the resource used
		*/
		nand_release(&this->board_mtd);

		/* free the common resources */
		iounmap(this->regs);
		kfree(this);

		DEBUG(MTD_DEBUG_LEVEL1, "%s: removed\n", module_id);
		return 0;
		}

		/*
		* Called by device layer when it finds a device matching
		* one our driver can handle. This code checks to see if
		* it can allocate all necessary resources then calls the
		* nand layer to look for devices.
		*/
		static int __init excite_nand_probe(struct device *dev)
		{
		struct platform_device * const pdev = to_platform_device(dev);
		struct excite_nand_drvdata drvdata; / private driver data */
		struct nand_chip board_chip; / private flash chip data */
		struct mtd_info board_mtd; / mtd info for this board */
		int scan_res;

		drvdata = kzalloc(sizeof(*drvdata), GFP_KERNEL);
		if (unlikely(!drvdata)) {
		printk(KERN_ERR "%s: no memory for drvdata\n",
		module_id);
		return -ENOMEM;
		}

		/* bind private data into driver */
		dev_set_drvdata(dev, drvdata);

		/* allocate and map the resource */
		drvdata->regs =
		excite_nand_map_regs(pdev, EXCITE_NANDFLASH_RESOURCE_REGS);

		if (unlikely(!drvdata->regs)) {
		printk(KERN_ERR "%s: cannot reserve register region\n",
		module_id);
		kfree(drvdata);
		return -ENXIO;
		}

		drvdata->tgt = drvdata->regs + EXCITE_NANDFLASH_DATA_BYTE;

		/* initialise our chip */
		board_chip = &drvdata->board_chip;
		board_chip->IO_ADDR_R = board_chip->IO_ADDR_W =
		drvdata->regs + EXCITE_NANDFLASH_DATA_BYTE;
		board_chip->cmd_ctrl = excite_nand_control;
		board_chip->dev_ready = excite_nand_devready;
		board_chip->chip_delay = 25;
		board_chip->ecc.mode = NAND_ECC_SOFT;

		/* link chip to mtd */
		board_mtd = &drvdata->board_mtd;
		board_mtd->priv = board_chip;

		DEBUG(MTD_DEBUG_LEVEL2, "%s: device scan\n", module_id);
		scan_res = nand_scan(&drvdata->board_mtd, 1);

		if (likely(!scan_res)) {
		DEBUG(MTD_DEBUG_LEVEL2, "%s: register partitions\n", module_id);
		add_mtd_partitions(&drvdata->board_mtd, partition_info,
		sizeof partition_info / sizeof partition_info[0]);
		} else {
		iounmap(drvdata->regs);
		kfree(drvdata);
		printk(KERN_ERR "%s: device scan failed\n", module_id);
		return -EIO;
		}
		return 0;
		}

		static struct device_driver excite_nand_driver = {
		.name = "excite_nand",
		.bus = &platform_bus_type,
		.probe = excite_nand_probe,
		.remove = __exit_p(excite_nand_remove)
		};

		static int __init excite_nand_init(void)
		{
		pr_info("Basler eXcite nand flash driver Version "
		EXCITE_NANDFLASH_VERSION "\n");
		return driver_register(&excite_nand_driver);
		}

		static void __exit excite_nand_exit(void)
		{
		driver_unregister(&excite_nand_driver);
		}

		module_init(excite_nand_init);
		module_exit(excite_nand_exit);

		MODULE_AUTHOR("Thomas Koeller <thomas.koeller@baslerweb.com>");
		MODULE_DESCRIPTION("Basler eXcite NAND-Flash driver");
		MODULE_LICENSE("GPL");
		MODULE_VERSION(EXCITE_NANDFLASH_VERSION)