at91_nand.c

at91rm9200的256M bytes Nand flash的Ads12测试代码

	 /* Send the command for reading device ID */
//	 this->cmdfunc (mtd, NAND_CMD_READID, 0x00, -1);
	 ST_CMD(NAND_CMD_READID, 0);
	 ST_CMD(0x00, 1);
	 
	 /* Read manufacturer and device IDs */
	 
	 nand_maf_id = readb (this_IO_ADDR_R);
	 nand_dev_id = readb (this_IO_ADDR_R);
 
	 /* Print and store flash device information */
	 for (i = 0; nand_flash_ids[i].name != NULL; i++) {
		 if (nand_dev_id == nand_flash_ids[i].id ) {
			 /* Try to identify manufacturer */
			 for (i = 0; nand_manuf_ids[i].id != 0x0; i++) 
			 {
				 if (nand_manuf_ids[i].id == nand_maf_id)	 break;
			 }	 
			 AT91F_DBGU_Printk ("NAND device: Manufacture ID:\n\r");
			 break;
		 }
	 }
 
	 /* Return happy */
	 return 0;
 }


/*
 * Main initialization routine
 */
//	static int __init at91_init (void)
int  at91_init (void)
{
	int err = 0x30,i;//,ok=0,error=0;
	this_IO_ADDR_R=AT91_SMARTMEDIA_BASE;
	at91_fio_base=AT91_SMARTMEDIA_BASE;

	for(i=0;i<PAGE_DATA_MAX;i++)
	{
		if(err>0x43) err=0x30;
		buff1[i]=err;
		err++;
	}
	for(i=0;i<30;i++)
	{
		buff2[i]=0x32;
	}
	

//	at91_fio_base = (unsigned long) ioremap(AT91_SMARTMEDIA_BASE, SZ_256M);//hqc 20070801 modify
	
	//* Setup MEMC to support CS3=nand Flash
	//	AT91C_BASE_EBI->EBI_CSA |= AT91C_EBI_CS3A_SMC_SmartMedia;
	//	AT91C_BASE_EBI->EBI_CFGR = (AT91C_EBI_DBPUC & 0x00) | (AT91C_EBI_EBSEN & 0x00);
		(*AT91C_EBI_CSA)|= AT91C_EBI_CS3A_SMC_SmartMedia;

//		AT91_SYS->EBI_CFGR = (AT91C_EBI_DBPUC & 0x00) | (AT91C_EBI_EBSEN & 0x00);
//	(*(volatile u8 *)0xffffff60) |= AT91C_EBI_CS3A_SMC_SmartMedia;
//	(*(volatile u8 *)0xffffff64) = (AT91C_EBI_DBPUC & 0x00) | (AT91C_EBI_EBSEN & 0x00);


			/* set the bus interface characteristics based on
			   tDS Data Set up Time 30 - ns
			   tDH Data Hold Time 20 - ns
			   tALS ALE Set up Time 20 - ns
			   16ns at 60 MHz ~= 3	*/
#define AT91C_SM_ID_RWH	(5 << 28)		/* orig = 5 */
#define AT91C_SM_RWH	(1 << 28)		/* orig = 1 */
#define AT91C_SM_RWS	(0 << 24)		/* orig = 0 */
#define AT91C_SM_TDF	(1 << 8)		/* orig = 1 */
#define AT91C_SM_NWS	(5)				/* orig = 3 */
#define AT91C_SMC2_CSR3  ((AT91_REG *) 	0xFFFFFF7C)

		(*AT91C_SMC2_CSR3)=	( AT91C_SM_RWH | AT91C_SM_RWS |
							 AT91C_SMC2_ACSS_STANDARD |
							 AT91C_SMC2_DBW_8 | AT91C_SM_TDF |
							 AT91C_SMC2_WSEN | AT91C_SM_NWS);


		AT91_CfgPIO_SmartMedia();
	nand_scan();

////nand flash erase,write,read test
	Erase_Block(0,1);
	for(i=0;i<15;i++)
	{
		delay();
	}
	Erase_Block(1,1);
	for(i=0;i<15;i++)
	{
		delay();
	}
for(i=0;i<100;i++)
{
	
	Program_Page(i,1);
	delay();
	delay();
	delay();
	delay();
	delay();

	Read_Page(i,1);
	
	for(err=0;err<30;err++)
	{
		if(buff2[err]!=buff1[err])break;
	}
	if(err==30)
		{
		AT91F_DBGU_Printk ("NAND device: read ok \n\r");
		}
	else
		{
		AT91F_DBGU_Printk ("NAND device: read error \n\r");
		}
		
	for(err=0;err<30;err++)
	{
		buff2[err]=0x32;
	}
	err=0;
	delay();
	delay();
	
}
	AT91F_DBGU_Printk ("NAND device: ok  ok\n\r");

	return err;
}


#if 0
/*
 * drivers/mtd/nand/at91_nand.c
 *
 *  Copyright (C) 2003 Rick Bronson
 *
 *  Derived from drivers/mtd/nand/autcpu12.c
 *  Copyright (c) 2001 Thomas Gleixner ([e-mail])
 *
 *  Derived from drivers/mtd/spia.c
 *  Copyright (C) 2000 Steven J. Hill ([e-mail])
 *
 * 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 */

 if (host->board->bus_width_16)  /* 16-bit bus width */
  nand_chip->options |= NAND_BUSWIDTH_16;

 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");

#endif