
/*
 * Copyright (c) 2d3D, Inc.
 * Written by Abraham vd Merwe <abraham@2d3d.co.za>
 * All rights reserved.
 *
 * $Id: mtd_debug.c,v 1.2 2004/07/30 13:35:01 sathesh Exp $
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *	  notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *	  notice, this list of conditions and the following disclaimer in the
 *	  documentation and/or other materials provided with the distribution.
 * 3. Neither the name of the author nor the names of other contributors
 *	  may be used to endorse or promote products derived from this software
 *	  without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#include <stdio.h>
#include <stdlib.h>
#include <errno.h>
#include <string.h>
#include <unistd.h>
#include <sys/ioctl.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <linux/mtd/mtd.h>

/*
 * MEMGETINFO
 */
static int getmeminfo (int fd,struct mtd_info_user *mtd)
{
   return (ioctl (fd,MEMGETINFO,mtd));
}

/*
 * MEMERASE
 */
static int memerase (int fd,struct erase_info_user *erase)
{
   return (ioctl (fd,MEMERASE,erase));
}

/*
 * MEMGETREGIONCOUNT
 * MEMGETREGIONINFO
 */
static int getregions (int fd,struct region_info_user *regions,int *n)
{
   int i,err;
   err = ioctl (fd,MEMGETREGIONCOUNT,n);
   if (err) return (err);
   for (i = 0; i < *n; i++)
	 {
		regions[i].regionindex = i;
		err = ioctl (fd,MEMGETREGIONINFO,&regions[i]);
		if (err) return (err);
	 }
   return (0);
}

int erase_flash (int fd,u_int32_t offset,u_int32_t bytes)
{
   int err;
   struct erase_info_user erase;
   erase.start = offset;
   erase.length = bytes;
   err = memerase (fd,&erase);
   if (err < 0)
	 {
		perror ("MEMERASE");
		return (1);
	 }
   fprintf (stderr,"Erased %d bytes from address 0x%.8x in flash\n",bytes,offset);
   return (0);
}

void printsize (u_int32_t x)
{
   int i;
   static const char *flags = "KMGT";
   printf ("%u ",x);
   for (i = 0; x >= 1024 && flags[i] != '\0'; i++) x /= 1024;
   i--;
   if (i >= 0) printf ("(%u%c)",x,flags[i]);
}

int flash_to_file (int fd,u_int32_t offset,size_t len,const char *filename)
{
   u_int8_t *buf;
   int outfd,err;
   if (offset != lseek (fd,offset,SEEK_SET))
	 {
		perror ("lseek()");
		goto err0;
	 }
   if ((buf = (u_int8_t *) malloc (len * sizeof (u_int8_t))) == NULL)
	 {
		perror ("malloc()");
		goto err0;
	 }
   outfd = creat (filename,O_WRONLY);
   if (outfd < 0)
	 {
		perror ("creat()");
		goto err1;
	 }
   err = read (fd,buf,len);
   if (err < 0)
	 {
		perror ("read()");
		goto err2;
	 }
   err = write (outfd,buf,len);
   if (err < 0)
	 {
		perror ("write()");
		goto err2;
	 }
   if (err != len)
	 {
		fprintf (stderr,"Couldn't copy entire buffer to %s. (%d/%d bytes copied)\n",filename,err,len);
		goto err2;
	 }

   free (buf);
   close (outfd);
   printf ("Copied %d bytes from address 0x%.8x in flash to %s\n",len,offset,filename);
   return (0);

   err2:
   close (outfd);
   err1:
   free (buf);
   err0:
   return (1);
}

int file_to_flash (int fd,u_int32_t offset,u_int32_t len,const char *filename)
{
   u_int8_t *buf;
   FILE *fp;
   int err;
   if (offset != lseek (fd,offset,SEEK_SET))
	 {
		perror ("lseek()");
		return (1);
	 }
   if ((buf = (u_int8_t *) malloc (len * sizeof (u_int8_t))) == NULL)
	 {
		perror ("malloc()");
		return (1);
	 }
   if ((fp = fopen (filename,"r")) == NULL)
	 {
		perror ("fopen()");
		free (buf);
		return (1);
	 }
   if (fread (buf,len,1,fp) != 1 || ferror (fp))
	 {
		perror ("fread()");
		free (buf);
		fclose (fp);
		return (1);
	 }
   err = write (fd,buf,len);
   if (err < 0)
	 {
		perror ("write()");
		free (buf);
		fclose (fp);
		return (1);
	 }
   free (buf);
   fclose (fp);
   printf ("Copied %d bytes from %s to address 0x%.8x in flash\n",len,filename,offset);
   return (0);
}

int showinfo (int fd)
{
   int i,err,n;
   struct mtd_info_user mtd;
   static struct region_info_user region[1024];

   err = getmeminfo (fd,&mtd);
   if (err < 0)
	 {
		perror ("MEMGETINFO");
		return (1);
	 }

   err = getregions (fd,region,&n);
   if (err < 0)
	 {
		perror ("MEMGETREGIONCOUNT");
		return (1);
	 }

   printf ("mtd.type = ");
   switch (mtd.type)
	 {
	  case MTD_ABSENT:
		printf ("MTD_ABSENT");
		break;
	  case MTD_RAM:
		printf ("MTD_RAM");
		break;
	  case MTD_ROM:
		printf ("MTD_ROM");
		break;
	  case MTD_NORFLASH:
		printf ("MTD_NORFLASH");
		break;
	  case MTD_NANDFLASH:
		printf ("MTD_NANDFLASH");
		break;
	  case MTD_PEROM:
		printf ("MTD_PEROM");
		break;
	  case MTD_OTHER:
		printf ("MTD_OTHER");
		break;
	  case MTD_UNKNOWN:
		printf ("MTD_UNKNOWN");
		break;
	  default:
		printf ("(unknown type - new MTD API maybe?)");
	 }

   printf ("\nmtd.flags = ");
   if (mtd.flags == MTD_CAP_ROM)
	 printf ("MTD_CAP_ROM");
   else if (mtd.flags == MTD_CAP_RAM)
	 printf ("MTD_CAP_RAM");
   else if (mtd.flags == MTD_CAP_NORFLASH)
	 printf ("MTD_CAP_NORFLASH");
   else if (mtd.flags == MTD_CAP_NANDFLASH)
	 printf ("MTD_CAP_NANDFLASH");
   else if (mtd.flags == MTD_WRITEABLE)
	 printf ("MTD_WRITEABLE");
   else
	 {
		int i,first = 1;
		static struct
		  {
			 const char *name;
			 int value;
		  } flags[] =
		  {
			 { "MTD_CLEAR_BITS", MTD_CLEAR_BITS },
			 { "MTD_SET_BITS", MTD_SET_BITS },
			 { "MTD_ERASEABLE", MTD_ERASEABLE },
			 { "MTD_WRITEB_WRITEABLE", MTD_WRITEB_WRITEABLE },
			 { "MTD_VOLATILE", MTD_VOLATILE },
			 { "MTD_XIP", MTD_XIP },
			 { "MTD_OOB", MTD_OOB },
			 { "MTD_ECC", MTD_ECC },
			 { NULL, -1 }
		  };
		for (i = 0; flags[i].name != NULL; i++)
		  if (mtd.flags & flags[i].value)
			{
			   if (first)
				 {
					printf (flags[i].name);
					first = 0;
				 }
			   else printf (" | %s",flags[i].name);
			}
	 }

   printf ("\nmtd.size = ");
   printsize (mtd.size);

   printf ("\nmtd.erasesize = ");
   printsize (mtd.erasesize);

   printf ("\nmtd.oobblock = ");
   printsize (mtd.oobblock);

   printf ("\nmtd.oobsize = ");
   printsize (mtd.oobsize);

   printf ("\nmtd.ecctype = ");
   switch (mtd.ecctype)
	 {
	  case MTD_ECC_NONE:
		printf ("MTD_ECC_NONE");
		break;
	  case MTD_ECC_RS_DiskOnChip:
		printf ("MTD_ECC_RS_DiskOnChip");
		break;
	  case MTD_ECC_SW:
		printf ("MTD_ECC_SW");
		break;
	  default:
		printf ("(unknown ECC type - new MTD API maybe?)");
	 }

   printf ("\n"
		   "regions = %d\n"
		   "\n",
		   n);

   for (i = 0; i < n; i++)
	 {
		printf ("region[%d].offset = 0x%.8x\n"
				"region[%d].erasesize = ",
				i,region[i].offset,i);
		printsize (region[i].erasesize);
		printf ("\nregion[%d].numblocks = %d\n"
				"region[%d].regionindex = %d\n",
				i,region[i].numblocks,
				i,region[i].regionindex);
	 }
   return (0);
}

void showusage (const char *progname)
{
   fprintf (stderr,
			"usage: %s info <device>\n"
			"       %s read <device> <offset> <len> <dest-filename>\n"
			"       %s write <device> <offset> <len> <source-filename>\n"
			"       %s erase <device> <offset> <len>\n",
			progname,
			progname,
			progname,
			progname);
   exit (1);
}

#define OPT_INFO	1
#define OPT_READ	2
#define OPT_WRITE	3
#define OPT_ERASE	4

int main (int argc,char *argv[])
{
   const char *progname;
   int err = 0,fd,option = OPT_INFO;
   (progname = strrchr (argv[0],'/')) ? progname++ : (progname = argv[0]);

   /* parse command-line options */
   if (argc == 3 && !strcmp (argv[1],"info"))
	 option = OPT_INFO;
   else if (argc == 6 && !strcmp (argv[1],"read"))
	 option = OPT_READ;
   else if (argc == 6 && !strcmp (argv[1],"write"))
	 option = OPT_WRITE;
   else if (argc == 5 && !strcmp (argv[1],"erase"))
	 option = OPT_ERASE;
   else
	 showusage (progname);

   /* open device */
   if ((fd = open (argv[2],O_SYNC | O_RDWR)) < 0)
	 {
		perror ("open()");
		exit (1);
	 }

   switch (option)
	 {
	  case OPT_INFO:
		showinfo (fd);
		break;
	  case OPT_READ:
		err = flash_to_file (fd,atol (argv[3]),atol (argv[4]),argv[5]);
		break;
	  case OPT_WRITE:
		err = file_to_flash (fd,atol (argv[3]),atol (argv[4]),argv[5]);
		break;
	  case OPT_ERASE:
		err = erase_flash (fd,atol (argv[3]),atol (argv[4]));
		break;
	 }

   /* close device */
   if (close (fd) < 0)
	 perror ("close()");

   exit (err);
}

