linux-imx

/*

 * Flash memory interface rev.5 driver for the Intel

 * Flash chips used on the NetWinder.

 *

 * 20/08/2000   RMK use __ioremap to map flash into virtual memory

 *          make a few more places use "volatile"

 * 22/05/2001   RMK - Lock read against write

 *          - merge printk level changes (with mods) from Alan Cox.

 *          - use *ppos as the file position, not file->f_pos.

 *          - fix check for out of range pos and r/w size

 *

 * Please note that we are tampering with the only flash chip in the

 * machine, which contains the bootup code.  We therefore have the

 * power to convert these machines into doorstops...

 */

​

#include <linux/module.h>

#include <linux/types.h>

#include <linux/fs.h>

#include <linux/errno.h>

#include <linux/mm.h>

#include <linux/delay.h>

#include <linux/proc_fs.h>

#include <linux/miscdevice.h>

#include <linux/spinlock.h>

#include <linux/rwsem.h>

#include <linux/init.h>

#include <linux/mutex.h>

#include <linux/jiffies.h>

​

#include <asm/hardware/dec21285.h>

#include <asm/io.h>

#include <asm/mach-types.h>

#include <linux/uaccess.h>

​

/*****************************************************************************/

#include <asm/nwflash.h>

​

#define NWFLASH_VERSION "6.4"

​

static DEFINE_MUTEX(flash_mutex);

static void kick_open(void);

static int get_flash_id(void);

static int erase_block(int nBlock);

static int write_block(unsigned long p, const char __user *buf, int count);

​

#define KFLASH_SIZE 1024*1024   //1 Meg

#define KFLASH_SIZE4    4*1024*1024 //4 Meg

#define KFLASH_ID   0x89A6      //Intel flash

#define KFLASH_ID4  0xB0D4      //Intel flash 4Meg

​

static bool flashdebug;     //if set - we will display progress msgs

​

static int gbWriteEnable;

static int gbWriteBase64Enable;

static volatile unsigned char *FLASH_BASE;

static int gbFlashSize = KFLASH_SIZE;

static DEFINE_MUTEX(nwflash_mutex);

​

static int get_flash_id(void)

{

    volatile unsigned int c1, c2;

​