mba44b0.c

microwindows移植到S3C44B0的源码

/*
 *  drivers/mtd/nand/s3c44b0.c
 *
 *  nand flash on anji mba-44b0 borad.
 *  
 * 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/mtd/mtd.h>
#include <linux/mtd/nand.h>
#include <linux/mtd/partitions.h>
#include <asm/io.h>
#include <asm/hardware.h>

static struct mtd_info *mba44b0_mtd = NULL;

/*
 * Module stuff
 */

/*
 * Define partitions for flash device
 */
const static struct mtd_partition partition_info[] = {
	{ name: "Kernel Image",
	  offset: 0,
	  size: 768*1024 },
		
	{ name: "File System",
	  offset: 768*1024,
	  size: 4*1024*1024 },
		
	{ name: "test",
	  offset: 5*1024*1024,
	  size: 8*1024*1024 }
};
#define NUM_PARTITIONS 3

/*
 * Main initialization routine
 */
int __init mba44b0_init (void)
{
	struct nand_chip *this;

	/* Allocate memory for MTD device structure and private data */
	mba44b0_mtd = kmalloc (sizeof(struct mtd_info) + sizeof (struct nand_chip),
				GFP_KERNEL);
	if (!mba44b0_mtd) {
		printk ("Unable to allocate NAND MTD device structure.\n");
		return -ENOMEM;
	}

	/* Get pointer to private data */
	this = (struct nand_chip *) (&mba44b0_mtd[1]);

	/* Initialize structures */
	memset((char *) mba44b0_mtd, 0, sizeof(struct mtd_info));
	memset((char *) this, 0, sizeof(struct nand_chip));

	/* Link the private data with the MTD structure */
	mba44b0_mtd->priv = this;


	/* Set address of NAND IO lines */
	this->IO_ADDR = 0x04000000;
	this->CTRL_ADDR = &PDATF;
	this->CLE = 0x20;
	this->ALE = 0x40;
	this->NCE = 0x00;

	/* Scan to find existence of the device */
	if (nand_scan (mba44b0_mtd)) {
		kfree (mba44b0_mtd);
		return -ENXIO;
	}
	init_waitqueue_head(&this->wq);

	/* Allocate memory for internal data buffer */
	this->data_buf = kmalloc (sizeof(u_char) * (mba44b0_mtd->oobblock + mba44b0_mtd->oobsize), GFP_KERNEL);
	if (!this->data_buf) {
		printk ("Unable to allocate NAND data buffer for SPIA.\n");
		kfree (mba44b0_mtd);
		return -ENOMEM;
	}

	/* Register the partitions */
	add_mtd_partitions(mba44b0_mtd, partition_info, NUM_PARTITIONS);

	/* Return happy */
	return 0;
}
module_init(mba44b0_init);

/*
 * Clean up routine
 */
#ifdef MODULE
static void __exit mba44b0_cleanup (void)
{
	struct nand_chip *this = (struct nand_chip *) &mba44b0_mtd[1];

	/* Unregister the device */
	del_mtd_device (mba44b0_mtd);

	/* Free internal data buffer */
	kfree (this->data_buf);

	/* Free the MTD device structure */
	kfree (mba44b0_mtd);
}
module_exit(mba44b0_cleanup);
#endif

MODULE_LICENSE("GPL");
MODULE_AUTHOR("tpu");
MODULE_DESCRIPTION("Board-specific glue layer for NAND flash on SPIA board");