Commit 42cb1403 authored by Andrew Victor's avatar Andrew Victor Committed by David Woodhouse
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[MTD] NAND: AT91 NAND driver 



This version only differs from version posted by Savin Zlobec (20 Jun
2006) in that the AT91RM9200-specific chip-select / bus setup code has
been moved from the at91_nand.c driver into the processor-specific file.

From: Savin Zlobec <savin@epico.si>
Signed-off-by: default avatarAndrew Victor <andrew@sanpeople.com>
Signed-off-by: default avatarDavid Woodhouse <dwmw2@infradead.org>
parent c7cf0c68

drivers/mtd/nand/Kconfig

+7 −0
Original line number Diff line number Diff line
@@ -232,6 +232,13 @@ config MTD_NAND_CS553X 


	  If you say "m", the module will be called "cs553x_nand.ko".



config MTD_NAND_AT91

	bool "Support for NAND Flash / SmartMedia on AT91"

	depends on MTD_NAND && ARCH_AT91

	help

	  Enables support for NAND Flash / Smart Media Card interface

	  on Atmel AT91 processors.



config MTD_NAND_NANDSIM

	tristate "Support for NAND Flash Simulator"

	depends on MTD_NAND && MTD_PARTITIONS

drivers/mtd/nand/Makefile

+1 −0
Original line number Diff line number Diff line
@@ -22,5 +22,6 @@ obj-$(CONFIG_MTD_NAND_TS7250) += ts7250.o 
obj-$(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



nand-objs = nand_base.o nand_bbt.o

drivers/mtd/nand/at91_nand.c

0 → 100644
+220 −0
Original line number Diff line number Diff line 
/*

 * drivers/mtd/nand/at91_nand.c

 *

 *  Copyright (C) 2003 Rick Bronson

 *

 *  Derived from drivers/mtd/nand/autcpu12.c

 *	 Copyright (c) 2001 Thomas Gleixner (gleixner@autronix.de)

 *

 *  Derived from drivers/mtd/spia.c

 *	 Copyright (C) 2000 Steven J. Hill (sjhill@cotw.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.

 *

 */



#include <linux/slab.h>

#include <linux/module.h>

#include <linux/platform_device.h>

#include <linux/mtd/mtd.h>

#include <linux/mtd/nand.h>

#include <linux/mtd/partitions.h>



#include <asm/io.h>

#include <asm/sizes.h>



#include <asm/hardware.h>

#include <asm/arch/board.h>

#include <asm/arch/gpio.h>



struct at91_nand_host {

	struct nand_chip	nand_chip;

	struct mtd_info		mtd;

	void __iomem		*io_base;

	struct at91_nand_data	*board;

};



/*

 * Hardware specific access to control-lines

 */

static void at91_nand_cmd_ctrl(struct mtd_info *mtd, int cmd, unsigned int ctrl)

{

	struct nand_chip *nand_chip = mtd->priv;

	struct at91_nand_host *host = nand_chip->priv;



	if (cmd == NAND_CMD_NONE)

		return;



	if (ctrl & NAND_CLE)

		writeb(cmd, host->io_base + (1 << host->board->cle));

	else

		writeb(cmd, host->io_base + (1 << host->board->ale));

}



/*

 * Read the Device Ready pin.

 */

static int at91_nand_device_ready(struct mtd_info *mtd)

{

	struct nand_chip *nand_chip = mtd->priv;

	struct at91_nand_host *host = nand_chip->priv;



	return at91_get_gpio_value(host->board->rdy_pin);

}



/*

 * Enable NAND.

 */

static void at91_nand_enable(struct at91_nand_host *host)

{

	if (host->board->enable_pin)

		at91_set_gpio_value(host->board->enable_pin, 0);

}



/*

 * Disable NAND.

 */

static void at91_nand_disable(struct at91_nand_host *host)

{

	if (host->board->enable_pin)

		at91_set_gpio_value(host->board->enable_pin, 1);

}



/*

 * Probe for the NAND device.

 */

static int __init at91_nand_probe(struct platform_device *pdev)

{

	struct at91_nand_host *host;

	struct mtd_info *mtd;

	struct nand_chip *nand_chip;

	int res;



#ifdef CONFIG_MTD_PARTITIONS

	struct mtd_partition *partitions = NULL;

	int num_partitions = 0;

#endif



	/* Allocate memory for the device structure (and zero it) */

	host = kzalloc(sizeof(struct at91_nand_host), GFP_KERNEL);

	if (!host) {

		printk(KERN_ERR "at91_nand: failed to allocate device structure.\n");

		return -ENOMEM;

	}



	host->io_base = ioremap(pdev->resource[0].start,

				pdev->resource[0].end - pdev->resource[0].start + 1);

	if (host->io_base == NULL) {

		printk(KERN_ERR "at91_nand: ioremap failed\n");

		kfree(host);

		return -EIO;

	}



	mtd = &host->mtd;

	nand_chip = &host->nand_chip;

	host->board = pdev->dev.platform_data;



	nand_chip->priv = host;		/* link the private data structures */

	mtd->priv = nand_chip;

	mtd->owner = THIS_MODULE;



	/* Set address of NAND IO lines */

	nand_chip->IO_ADDR_R = host->io_base;

	nand_chip->IO_ADDR_W = host->io_base;

	nand_chip->cmd_ctrl = at91_nand_cmd_ctrl;

	nand_chip->dev_ready = at91_nand_device_ready;

	nand_chip->ecc.mode = NAND_ECC_SOFT;	/* enable ECC */

	nand_chip->chip_delay = 20;		/* 20us command delay time */



	platform_set_drvdata(pdev, host);

	at91_nand_enable(host);



	if (host->board->det_pin) {

		if (at91_get_gpio_value(host->board->det_pin)) {

			printk ("No SmartMedia card inserted.\n");

			res = ENXIO;

			goto out;

		}

	}



	/* Scan to find existance of the device */

	if (nand_scan(mtd, 1)) {

		res = -ENXIO;

		goto out;

	}



#ifdef CONFIG_MTD_PARTITIONS

	if (host->board->partition_info)

		partitions = host->board->partition_info(mtd->size, &num_partitions);



	if ((!partitions) || (num_partitions == 0)) {

		printk(KERN_ERR "at91_nand: No parititions defined, or unsupported device.\n");

		res = ENXIO;

		goto release;

	}



	res = add_mtd_partitions(mtd, partitions, num_partitions);

#else

	res = add_mtd_device(mtd);

#endif



	if (!res)

		return res;



release:

	nand_release(mtd);

out:

	at91_nand_disable(host);

	platform_set_drvdata(pdev, NULL);

	iounmap(host->io_base);

	kfree(host);

	return res;

}



/*

 * Remove a NAND device.

 */

static int __devexit at91_nand_remove(struct platform_device *pdev)

{

	struct at91_nand_host *host = platform_get_drvdata(pdev);

	struct mtd_info *mtd = &host->mtd;



	nand_release(mtd);



	at91_nand_disable(host);



	iounmap(host->io_base);

	kfree(host);



	return 0;

}



static struct platform_driver at91_nand_driver = {

	.probe		= at91_nand_probe,

	.remove		= at91_nand_remove,

	.driver		= {

		.name	= "at91_nand",

		.owner	= THIS_MODULE,

	},

};



static int __init at91_nand_init(void)

{

	return platform_driver_register(&at91_nand_driver);

}





static void __exit at91_nand_exit(void)

{

	platform_driver_unregister(&at91_nand_driver);

}





module_init(at91_nand_init);

module_exit(at91_nand_exit);



MODULE_LICENSE("GPL");

MODULE_AUTHOR("Rick Bronson");

MODULE_DESCRIPTION("NAND/SmartMedia driver for AT91RM9200");

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