[GitHub/mt8127/android_kernel_alcatel_ttab.git] / drivers / mtd / devices / lart.c


/*
 * MTD driver for the 28F160F3 Flash Memory (non-CFI) on LART.
 *
 * Author: Abraham vd Merwe <abraham@2d3d.co.za>
 *
 * Copyright (c) 2001, 2d3D, Inc.
 *
 * This code 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.
 *
 * References:
 *
 *    [1] 3 Volt Fast Boot Block Flash Memory" Intel Datasheet
 *           - Order Number: 290644-005
 *           - January 2000
 *
 *    [2] MTD internal API documentation
 *           - http://www.linux-mtd.infradead.org/ 
 *
 * Limitations:
 *
 *    Even though this driver is written for 3 Volt Fast Boot
 *    Block Flash Memory, it is rather specific to LART. With
 *    Minor modifications, notably the without data/address line
 *    mangling and different bus settings, etc. it should be
 *    trivial to adapt to other platforms.
 *
 *    If somebody would sponsor me a different board, I'll
 *    adapt the driver (:
 */

/* debugging */
//#define LART_DEBUG

/* partition support */
#define HAVE_PARTITIONS

#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/types.h>
#include <linux/init.h>
#include <linux/errno.h>
#include <linux/string.h>
#include <linux/mtd/mtd.h>
#ifdef HAVE_PARTITIONS
#include <linux/mtd/partitions.h>
#endif

#ifndef CONFIG_SA1100_LART
#error This is for LART architecture only
#endif

static char module_name[] = "lart";

/*
 * These values is specific to 28Fxxxx3 flash memory.
 * See section 2.3.1 in "3 Volt Fast Boot Block Flash Memory" Intel Datasheet
 */
#define FLASH_BLOCKSIZE_PARAM		(4096 * BUSWIDTH)
#define FLASH_NUMBLOCKS_16m_PARAM	8
#define FLASH_NUMBLOCKS_8m_PARAM	8

/*
 * These values is specific to 28Fxxxx3 flash memory.
 * See section 2.3.2 in "3 Volt Fast Boot Block Flash Memory" Intel Datasheet
 */
#define FLASH_BLOCKSIZE_MAIN		(32768 * BUSWIDTH)
#define FLASH_NUMBLOCKS_16m_MAIN	31
#define FLASH_NUMBLOCKS_8m_MAIN		15

/*
 * These values are specific to LART
 */

/* general */
#define BUSWIDTH			4				/* don't change this - a lot of the code _will_ break if you change this */
#define FLASH_OFFSET		0xe8000000		/* see linux/arch/arm/mach-sa1100/lart.c */

/* blob */
#define NUM_BLOB_BLOCKS		FLASH_NUMBLOCKS_16m_PARAM
#define BLOB_START			0x00000000
#define BLOB_LEN			(NUM_BLOB_BLOCKS * FLASH_BLOCKSIZE_PARAM)

/* kernel */
#define NUM_KERNEL_BLOCKS	7
#define KERNEL_START		(BLOB_START + BLOB_LEN)
#define KERNEL_LEN			(NUM_KERNEL_BLOCKS * FLASH_BLOCKSIZE_MAIN)

/* initial ramdisk */
#define NUM_INITRD_BLOCKS	24
#define INITRD_START		(KERNEL_START + KERNEL_LEN)
#define INITRD_LEN			(NUM_INITRD_BLOCKS * FLASH_BLOCKSIZE_MAIN)

/*
 * See section 4.0 in "3 Volt Fast Boot Block Flash Memory" Intel Datasheet
 */
#define READ_ARRAY			0x00FF00FF		/* Read Array/Reset */
#define READ_ID_CODES		0x00900090		/* Read Identifier Codes */
#define ERASE_SETUP			0x00200020		/* Block Erase */
#define ERASE_CONFIRM		0x00D000D0		/* Block Erase and Program Resume */
#define PGM_SETUP			0x00400040		/* Program */
#define STATUS_READ			0x00700070		/* Read Status Register */
#define STATUS_CLEAR		0x00500050		/* Clear Status Register */
#define STATUS_BUSY			0x00800080		/* Write State Machine Status (WSMS) */
#define STATUS_ERASE_ERR	0x00200020		/* Erase Status (ES) */
#define STATUS_PGM_ERR		0x00100010		/* Program Status (PS) */

/*
 * See section 4.2 in "3 Volt Fast Boot Block Flash Memory" Intel Datasheet
 */
#define FLASH_MANUFACTURER			0x00890089
#define FLASH_DEVICE_8mbit_TOP		0x88f188f1
#define FLASH_DEVICE_8mbit_BOTTOM	0x88f288f2
#define FLASH_DEVICE_16mbit_TOP		0x88f388f3
#define FLASH_DEVICE_16mbit_BOTTOM	0x88f488f4

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

/*
 * The data line mapping on LART is as follows:
 *
 *   	 U2  CPU |   U3  CPU
 *   	 -------------------
 *   	  0  20  |   0   12
 *   	  1  22  |   1   14
 *   	  2  19  |   2   11
 *   	  3  17  |   3   9
 *   	  4  24  |   4   0
 *   	  5  26  |   5   2
 *   	  6  31  |   6   7
 *   	  7  29  |   7   5
 *   	  8  21  |   8   13
 *   	  9  23  |   9   15
 *   	  10 18  |   10  10
 *   	  11 16  |   11  8
 *   	  12 25  |   12  1
 *   	  13 27  |   13  3
 *   	  14 30  |   14  6
 *   	  15 28  |   15  4
 */

/* Mangle data (x) */
#define DATA_TO_FLASH(x)				\
	(									\
		(((x) & 0x08009000) >> 11)	+	\
		(((x) & 0x00002000) >> 10)	+	\
		(((x) & 0x04004000) >> 8)	+	\
		(((x) & 0x00000010) >> 4)	+	\
		(((x) & 0x91000820) >> 3)	+	\
		(((x) & 0x22080080) >> 2)	+	\
		((x) & 0x40000400)			+	\
		(((x) & 0x00040040) << 1)	+	\
		(((x) & 0x00110000) << 4)	+	\
		(((x) & 0x00220100) << 5)	+	\
		(((x) & 0x00800208) << 6)	+	\
		(((x) & 0x00400004) << 9)	+	\
		(((x) & 0x00000001) << 12)	+	\
		(((x) & 0x00000002) << 13)		\
	)

/* Unmangle data (x) */
#define FLASH_TO_DATA(x)				\
	(									\
		(((x) & 0x00010012) << 11)	+	\
		(((x) & 0x00000008) << 10)	+	\
		(((x) & 0x00040040) << 8)	+	\
		(((x) & 0x00000001) << 4)	+	\
		(((x) & 0x12200104) << 3)	+	\
		(((x) & 0x08820020) << 2)	+	\
		((x) & 0x40000400)			+	\
		(((x) & 0x00080080) >> 1)	+	\
		(((x) & 0x01100000) >> 4)	+	\
		(((x) & 0x04402000) >> 5)	+	\
		(((x) & 0x20008200) >> 6)	+	\
		(((x) & 0x80000800) >> 9)	+	\
		(((x) & 0x00001000) >> 12)	+	\
		(((x) & 0x00004000) >> 13)		\
	)

/*
 * The address line mapping on LART is as follows:
 *
 *   	 U3  CPU |   U2  CPU
 *   	 -------------------
 *   	  0  2   |   0   2
 *   	  1  3   |   1   3
 *   	  2  9   |   2   9
 *   	  3  13  |   3   8
 *   	  4  8   |   4   7
 *   	  5  12  |   5   6
 *   	  6  11  |   6   5
 *   	  7  10  |   7   4
 *   	  8  4   |   8   10
 *   	  9  5   |   9   11
 *   	 10  6   |   10  12
 *   	 11  7   |   11  13
 *
 *   	 BOOT BLOCK BOUNDARY
 *
 *   	 12  15  |   12  15
 *   	 13  14  |   13  14
 *   	 14  16  |   14  16
 *
 *   	 MAIN BLOCK BOUNDARY
 *
 *   	 15  17  |   15  18
 *   	 16  18  |   16  17
 *   	 17  20  |   17  20
 *   	 18  19  |   18  19
 *   	 19  21  |   19  21
 *
 * As we can see from above, the addresses aren't mangled across
 * block boundaries, so we don't need to worry about address
 * translations except for sending/reading commands during
 * initialization
 */

/* Mangle address (x) on chip U2 */
#define ADDR_TO_FLASH_U2(x)				\
	(									\
		(((x) & 0x00000f00) >> 4)	+	\
		(((x) & 0x00042000) << 1)	+	\
		(((x) & 0x0009c003) << 2)	+	\
		(((x) & 0x00021080) << 3)	+	\
		(((x) & 0x00000010) << 4)	+	\
		(((x) & 0x00000040) << 5)	+	\
		(((x) & 0x00000024) << 7)	+	\
		(((x) & 0x00000008) << 10)		\
	)

/* Unmangle address (x) on chip U2 */
#define FLASH_U2_TO_ADDR(x)				\
	(									\
		(((x) << 4) & 0x00000f00)	+	\
		(((x) >> 1) & 0x00042000)	+	\
		(((x) >> 2) & 0x0009c003)	+	\
		(((x) >> 3) & 0x00021080)	+	\
		(((x) >> 4) & 0x00000010)	+	\
		(((x) >> 5) & 0x00000040)	+	\
		(((x) >> 7) & 0x00000024)	+	\
		(((x) >> 10) & 0x00000008)		\
	)

/* Mangle address (x) on chip U3 */
#define ADDR_TO_FLASH_U3(x)				\
	(									\
		(((x) & 0x00000080) >> 3)	+	\
		(((x) & 0x00000040) >> 1)	+	\
		(((x) & 0x00052020) << 1)	+	\
		(((x) & 0x00084f03) << 2)	+	\
		(((x) & 0x00029010) << 3)	+	\
		(((x) & 0x00000008) << 5)	+	\
		(((x) & 0x00000004) << 7)		\
	)

/* Unmangle address (x) on chip U3 */
#define FLASH_U3_TO_ADDR(x)				\
	(									\
		(((x) << 3) & 0x00000080)	+	\
		(((x) << 1) & 0x00000040)	+	\
		(((x) >> 1) & 0x00052020)	+	\
		(((x) >> 2) & 0x00084f03)	+	\
		(((x) >> 3) & 0x00029010)	+	\
		(((x) >> 5) & 0x00000008)	+	\
		(((x) >> 7) & 0x00000004)		\
	)

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

static __u8 read8 (__u32 offset)
{
   volatile __u8 *data = (__u8 *) (FLASH_OFFSET + offset);
#ifdef LART_DEBUG
   printk (KERN_DEBUG "%s(): 0x%.8x -> 0x%.2x\n", __func__, offset, *data);
#endif
   return (*data);
}

static __u32 read32 (__u32 offset)
{
   volatile __u32 *data = (__u32 *) (FLASH_OFFSET + offset);
#ifdef LART_DEBUG
   printk (KERN_DEBUG "%s(): 0x%.8x -> 0x%.8x\n", __func__, offset, *data);
#endif
   return (*data);
}

static void write32 (__u32 x,__u32 offset)
{
   volatile __u32 *data = (__u32 *) (FLASH_OFFSET + offset);
   *data = x;
#ifdef LART_DEBUG
   printk (KERN_DEBUG "%s(): 0x%.8x <- 0x%.8x\n", __func__, offset, *data);
#endif
}

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

/*
 * Probe for 16mbit flash memory on a LART board without doing
 * too much damage. Since we need to write 1 dword to memory,
 * we're f**cked if this happens to be DRAM since we can't
 * restore the memory (otherwise we might exit Read Array mode).
 *
 * Returns 1 if we found 16mbit flash memory on LART, 0 otherwise.
 */
static int flash_probe (void)
{
   __u32 manufacturer,devtype;

   /* setup "Read Identifier Codes" mode */
   write32 (DATA_TO_FLASH (READ_ID_CODES),0x00000000);

   /* probe U2. U2/U3 returns the same data since the first 3
	* address lines is mangled in the same way */
   manufacturer = FLASH_TO_DATA (read32 (ADDR_TO_FLASH_U2 (0x00000000)));
   devtype = FLASH_TO_DATA (read32 (ADDR_TO_FLASH_U2 (0x00000001)));

   /* put the flash back into command mode */
   write32 (DATA_TO_FLASH (READ_ARRAY),0x00000000);

   return (manufacturer == FLASH_MANUFACTURER && (devtype == FLASH_DEVICE_16mbit_TOP || devtype == FLASH_DEVICE_16mbit_BOTTOM));
}

/*
 * Erase one block of flash memory at offset ``offset'' which is any
 * address within the block which should be erased.
 *
 * Returns 1 if successful, 0 otherwise.
 */
static inline int erase_block (__u32 offset)
{
   __u32 status;

#ifdef LART_DEBUG
   printk (KERN_DEBUG "%s(): 0x%.8x\n", __func__, offset);
#endif

   /* erase and confirm */
   write32 (DATA_TO_FLASH (ERASE_SETUP),offset);
   write32 (DATA_TO_FLASH (ERASE_CONFIRM),offset);

   /* wait for block erase to finish */
   do
	 {
		write32 (DATA_TO_FLASH (STATUS_READ),offset);
		status = FLASH_TO_DATA (read32 (offset));
	 }
   while ((~status & STATUS_BUSY) != 0);

   /* put the flash back into command mode */
   write32 (DATA_TO_FLASH (READ_ARRAY),offset);

   /* was the erase successful? */
   if ((status & STATUS_ERASE_ERR))
	 {
		printk (KERN_WARNING "%s: erase error at address 0x%.8x.\n",module_name,offset);
		return (0);
	 }

   return (1);
}

static int flash_erase (struct mtd_info *mtd,struct erase_info *instr)
{
   __u32 addr,len;
   int i,first;

#ifdef LART_DEBUG
   printk (KERN_DEBUG "%s(addr = 0x%.8x, len = %d)\n", __func__, instr->addr, instr->len);
#endif

   /* sanity checks */
   if (instr->addr + instr->len > mtd->size) return (-EINVAL);

   /*
	* check that both start and end of the requested erase are
	* aligned with the erasesize at the appropriate addresses.
	*
	* skip all erase regions which are ended before the start of
	* the requested erase. Actually, to save on the calculations,
	* we skip to the first erase region which starts after the
	* start of the requested erase, and then go back one.
	*/
   for (i = 0; i < mtd->numeraseregions && instr->addr >= mtd->eraseregions[i].offset; i++) ;
   i--;

   /*
	* ok, now i is pointing at the erase region in which this
	* erase request starts. Check the start of the requested
	* erase range is aligned with the erase size which is in
	* effect here.
	*/
   if (i < 0 || (instr->addr & (mtd->eraseregions[i].erasesize - 1)))
      return -EINVAL;

   /* Remember the erase region we start on */
   first = i;

   /*
	* next, check that the end of the requested erase is aligned
	* with the erase region at that address.
	*
	* as before, drop back one to point at the region in which
	* the address actually falls
	*/
   for (; i < mtd->numeraseregions && instr->addr + instr->len >= mtd->eraseregions[i].offset; i++) ;
   i--;

   /* is the end aligned on a block boundary? */
   if (i < 0 || ((instr->addr + instr->len) & (mtd->eraseregions[i].erasesize - 1)))
      return -EINVAL;

   addr = instr->addr;
   len = instr->len;

   i = first;

   /* now erase those blocks */
   while (len)
	 {
		if (!erase_block (addr))
		  {
			 instr->state = MTD_ERASE_FAILED;
			 return (-EIO);
		  }

		addr += mtd->eraseregions[i].erasesize;
		len -= mtd->eraseregions[i].erasesize;

		if (addr == mtd->eraseregions[i].offset + (mtd->eraseregions[i].erasesize * mtd->eraseregions[i].numblocks)) i++;
	 }

   instr->state = MTD_ERASE_DONE;
   mtd_erase_callback(instr);

   return (0);
}

static int flash_read (struct mtd_info *mtd,loff_t from,size_t len,size_t *retlen,u_char *buf)
{
#ifdef LART_DEBUG
   printk (KERN_DEBUG "%s(from = 0x%.8x, len = %d)\n", __func__, (__u32)from, len);
#endif

   /* sanity checks */
   if (!len) return (0);
   if (from + len > mtd->size) return (-EINVAL);

   /* we always read len bytes */
   *retlen = len;

   /* first, we read bytes until we reach a dword boundary */
   if (from & (BUSWIDTH - 1))
	 {
		int gap = BUSWIDTH - (from & (BUSWIDTH - 1));

		while (len && gap--) *buf++ = read8 (from++), len--;
	 }

   /* now we read dwords until we reach a non-dword boundary */
   while (len >= BUSWIDTH)
	 {
		*((__u32 *) buf) = read32 (from);

		buf += BUSWIDTH;
		from += BUSWIDTH;
		len -= BUSWIDTH;
	 }

   /* top up the last unaligned bytes */
   if (len & (BUSWIDTH - 1))
	 while (len--) *buf++ = read8 (from++);

   return (0);
}

/*
 * Write one dword ``x'' to flash memory at offset ``offset''. ``offset''
 * must be 32 bits, i.e. it must be on a dword boundary.
 *
 * Returns 1 if successful, 0 otherwise.
 */
static inline int write_dword (__u32 offset,__u32 x)
{
   __u32 status;

#ifdef LART_DEBUG
   printk (KERN_DEBUG "%s(): 0x%.8x <- 0x%.8x\n", __func__, offset, x);
#endif

   /* setup writing */
   write32 (DATA_TO_FLASH (PGM_SETUP),offset);

   /* write the data */
   write32 (x,offset);

   /* wait for the write to finish */
   do
	 {
		write32 (DATA_TO_FLASH (STATUS_READ),offset);
		status = FLASH_TO_DATA (read32 (offset));
	 }
   while ((~status & STATUS_BUSY) != 0);

   /* put the flash back into command mode */
   write32 (DATA_TO_FLASH (READ_ARRAY),offset);

   /* was the write successful? */
   if ((status & STATUS_PGM_ERR) || read32 (offset) != x)
	 {
		printk (KERN_WARNING "%s: write error at address 0x%.8x.\n",module_name,offset);
		return (0);
	 }

   return (1);
}

static int flash_write (struct mtd_info *mtd,loff_t to,size_t len,size_t *retlen,const u_char *buf)
{
   __u8 tmp[4];
   int i,n;

#ifdef LART_DEBUG
   printk (KERN_DEBUG "%s(to = 0x%.8x, len = %d)\n", __func__, (__u32)to, len);
#endif

   *retlen = 0;

   /* sanity checks */
   if (!len) return (0);
   if (to + len > mtd->size) return (-EINVAL);

   /* first, we write a 0xFF.... padded byte until we reach a dword boundary */
   if (to & (BUSWIDTH - 1))
	 {
		__u32 aligned = to & ~(BUSWIDTH - 1);
		int gap = to - aligned;

		i = n = 0;

		while (gap--) tmp[i++] = 0xFF;
		while (len && i < BUSWIDTH) tmp[i++] = buf[n++], len--;
		while (i < BUSWIDTH) tmp[i++] = 0xFF;

		if (!write_dword (aligned,*((__u32 *) tmp))) return (-EIO);

		to += n;
		buf += n;
		*retlen += n;
	 }

   /* now we write dwords until we reach a non-dword boundary */
   while (len >= BUSWIDTH)
	 {
		if (!write_dword (to,*((__u32 *) buf))) return (-EIO);

		to += BUSWIDTH;
		buf += BUSWIDTH;
		*retlen += BUSWIDTH;
		len -= BUSWIDTH;
	 }

   /* top up the last unaligned bytes, padded with 0xFF.... */
   if (len & (BUSWIDTH - 1))
	 {
		i = n = 0;

		while (len--) tmp[i++] = buf[n++];
		while (i < BUSWIDTH) tmp[i++] = 0xFF;

		if (!write_dword (to,*((__u32 *) tmp))) return (-EIO);

		*retlen += n;
	 }

   return (0);
}

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

static struct mtd_info mtd;

static struct mtd_erase_region_info erase_regions[] = {
	/* parameter blocks */
	{
		.offset		= 0x00000000,
		.erasesize	= FLASH_BLOCKSIZE_PARAM,
		.numblocks	= FLASH_NUMBLOCKS_16m_PARAM,
	},
	/* main blocks */
	{
		.offset	 = FLASH_BLOCKSIZE_PARAM * FLASH_NUMBLOCKS_16m_PARAM,
		.erasesize	= FLASH_BLOCKSIZE_MAIN,
		.numblocks	= FLASH_NUMBLOCKS_16m_MAIN,
	}
};

#ifdef HAVE_PARTITIONS
static struct mtd_partition lart_partitions[] = {
	/* blob */
	{
		.name	= "blob",
		.offset	= BLOB_START,
		.size	= BLOB_LEN,
	},
	/* kernel */
	{
		.name	= "kernel",
		.offset	= KERNEL_START,		/* MTDPART_OFS_APPEND */
		.size	= KERNEL_LEN,
	},
	/* initial ramdisk / file system */
	{
		.name	= "file system",
		.offset	= INITRD_START,		/* MTDPART_OFS_APPEND */
		.size	= INITRD_LEN,		/* MTDPART_SIZ_FULL */
	}
};
#endif

static int __init lart_flash_init (void)
{
   int result;
   memset (&mtd,0,sizeof (mtd));
   printk ("MTD driver for LART. Written by Abraham vd Merwe <abraham@2d3d.co.za>\n");
   printk ("%s: Probing for 28F160x3 flash on LART...\n",module_name);
   if (!flash_probe ())
	 {
		printk (KERN_WARNING "%s: Found no LART compatible flash device\n",module_name);
		return (-ENXIO);
	 }
   printk ("%s: This looks like a LART board to me.\n",module_name);
   mtd.name = module_name;
   mtd.type = MTD_NORFLASH;
   mtd.writesize = 1;
   mtd.flags = MTD_CAP_NORFLASH;
   mtd.size = FLASH_BLOCKSIZE_PARAM * FLASH_NUMBLOCKS_16m_PARAM + FLASH_BLOCKSIZE_MAIN * FLASH_NUMBLOCKS_16m_MAIN;
   mtd.erasesize = FLASH_BLOCKSIZE_MAIN;
   mtd.numeraseregions = ARRAY_SIZE(erase_regions);
   mtd.eraseregions = erase_regions;
   mtd.erase = flash_erase;
   mtd.read = flash_read;
   mtd.write = flash_write;
   mtd.owner = THIS_MODULE;

#ifdef LART_DEBUG
   printk (KERN_DEBUG
		   "mtd.name = %s\n"
		   "mtd.size = 0x%.8x (%uM)\n"
		   "mtd.erasesize = 0x%.8x (%uK)\n"
		   "mtd.numeraseregions = %d\n",
		   mtd.name,
		   mtd.size,mtd.size / (1024*1024),
		   mtd.erasesize,mtd.erasesize / 1024,
		   mtd.numeraseregions);

   if (mtd.numeraseregions)
	 for (result = 0; result < mtd.numeraseregions; result++)
	   printk (KERN_DEBUG
			   "\n\n"
			   "mtd.eraseregions[%d].offset = 0x%.8x\n"
			   "mtd.eraseregions[%d].erasesize = 0x%.8x (%uK)\n"
			   "mtd.eraseregions[%d].numblocks = %d\n",
			   result,mtd.eraseregions[result].offset,
			   result,mtd.eraseregions[result].erasesize,mtd.eraseregions[result].erasesize / 1024,
			   result,mtd.eraseregions[result].numblocks);

#ifdef HAVE_PARTITIONS
   printk ("\npartitions = %d\n", ARRAY_SIZE(lart_partitions));

   for (result = 0; result < ARRAY_SIZE(lart_partitions); result++)
	 printk (KERN_DEBUG
			 "\n\n"
			 "lart_partitions[%d].name = %s\n"
			 "lart_partitions[%d].offset = 0x%.8x\n"
			 "lart_partitions[%d].size = 0x%.8x (%uK)\n",
			 result,lart_partitions[result].name,
			 result,lart_partitions[result].offset,
			 result,lart_partitions[result].size,lart_partitions[result].size / 1024);
#endif
#endif

#ifndef HAVE_PARTITIONS
   result = add_mtd_device (&mtd);
#else
   result = add_mtd_partitions (&mtd,lart_partitions, ARRAY_SIZE(lart_partitions));
#endif

   return (result);
}

static void __exit lart_flash_exit (void)
{
#ifndef HAVE_PARTITIONS
   del_mtd_device (&mtd);
#else
   del_mtd_partitions (&mtd);
#endif
}

module_init (lart_flash_init);
module_exit (lart_flash_exit);

MODULE_LICENSE("GPL");
MODULE_AUTHOR("Abraham vd Merwe <abraham@2d3d.co.za>");
MODULE_DESCRIPTION("MTD driver for Intel 28F160F3 on LART board");
Commit	Line	Data
1da177e4 LT	1
	2	/*
	3	* MTD driver for the 28F160F3 Flash Memory (non-CFI) on LART.
	4	*
1da177e4 LT	5	* Author: Abraham vd Merwe <abraham@2d3d.co.za>
	6	*
	7	* Copyright (c) 2001, 2d3D, Inc.
	8	*
	9	* This code is free software; you can redistribute it and/or modify
	10	* it under the terms of the GNU General Public License version 2 as
	11	* published by the Free Software Foundation.
	12	*
	13	* References:
	14	*
	15	* [1] 3 Volt Fast Boot Block Flash Memory" Intel Datasheet
	16	* - Order Number: 290644-005
	17	* - January 2000
	18	*
	19	* [2] MTD internal API documentation
631dd1a8	20	* - http://www.linux-mtd.infradead.org/
1da177e4 LT	21	*
	22	* Limitations:
	23	*
	24	* Even though this driver is written for 3 Volt Fast Boot
	25	* Block Flash Memory, it is rather specific to LART. With
	26	* Minor modifications, notably the without data/address line
	27	* mangling and different bus settings, etc. it should be
	28	* trivial to adapt to other platforms.
	29	*
	30	* If somebody would sponsor me a different board, I'll
	31	* adapt the driver (:
	32	*/
	33
	34	/* debugging */
	35	//#define LART_DEBUG
	36
	37	/* partition support */
	38	#define HAVE_PARTITIONS
	39
	40	#include <linux/kernel.h>
	41	#include <linux/module.h>
	42	#include <linux/types.h>
	43	#include <linux/init.h>
	44	#include <linux/errno.h>
4e57b681	45	#include <linux/string.h>
1da177e4 LT	46	#include <linux/mtd/mtd.h>
	47	#ifdef HAVE_PARTITIONS
	48	#include <linux/mtd/partitions.h>
	49	#endif
	50
	51	#ifndef CONFIG_SA1100_LART
	52	#error This is for LART architecture only
	53	#endif
	54
	55	static char module_name[] = "lart";
	56
	57	/*
	58	* These values is specific to 28Fxxxx3 flash memory.
	59	* See section 2.3.1 in "3 Volt Fast Boot Block Flash Memory" Intel Datasheet
	60	*/
	61	#define FLASH_BLOCKSIZE_PARAM (4096 * BUSWIDTH)
	62	#define FLASH_NUMBLOCKS_16m_PARAM 8
	63	#define FLASH_NUMBLOCKS_8m_PARAM 8
	64
	65	/*
	66	* These values is specific to 28Fxxxx3 flash memory.
	67	* See section 2.3.2 in "3 Volt Fast Boot Block Flash Memory" Intel Datasheet
	68	*/
	69	#define FLASH_BLOCKSIZE_MAIN (32768 * BUSWIDTH)
	70	#define FLASH_NUMBLOCKS_16m_MAIN 31
	71	#define FLASH_NUMBLOCKS_8m_MAIN 15
	72
	73	/*
	74	* These values are specific to LART
	75	*/
	76
	77	/* general */
	78	#define BUSWIDTH 4 /* don't change this - a lot of the code _will_ break if you change this */
	79	#define FLASH_OFFSET 0xe8000000 /* see linux/arch/arm/mach-sa1100/lart.c */
	80
	81	/* blob */
	82	#define NUM_BLOB_BLOCKS FLASH_NUMBLOCKS_16m_PARAM
	83	#define BLOB_START 0x00000000
	84	#define BLOB_LEN (NUM_BLOB_BLOCKS * FLASH_BLOCKSIZE_PARAM)
	85
	86	/* kernel */
	87	#define NUM_KERNEL_BLOCKS 7
	88	#define KERNEL_START (BLOB_START + BLOB_LEN)
	89	#define KERNEL_LEN (NUM_KERNEL_BLOCKS * FLASH_BLOCKSIZE_MAIN)
	90
	91	/* initial ramdisk */
	92	#define NUM_INITRD_BLOCKS 24
	93	#define INITRD_START (KERNEL_START + KERNEL_LEN)
	94	#define INITRD_LEN (NUM_INITRD_BLOCKS * FLASH_BLOCKSIZE_MAIN)
	95
	96	/*
	97	* See section 4.0 in "3 Volt Fast Boot Block Flash Memory" Intel Datasheet
	98	*/
	99	#define READ_ARRAY 0x00FF00FF /* Read Array/Reset */
	100	#define READ_ID_CODES 0x00900090 /* Read Identifier Codes */
	101	#define ERASE_SETUP 0x00200020 /* Block Erase */
	102	#define ERASE_CONFIRM 0x00D000D0 /* Block Erase and Program Resume */
	103	#define PGM_SETUP 0x00400040 /* Program */
	104	#define STATUS_READ 0x00700070 /* Read Status Register */
	105	#define STATUS_CLEAR 0x00500050 /* Clear Status Register */
	106	#define STATUS_BUSY 0x00800080 /* Write State Machine Status (WSMS) */
	107	#define STATUS_ERASE_ERR 0x00200020 /* Erase Status (ES) */
	108	#define STATUS_PGM_ERR 0x00100010 /* Program Status (PS) */
	109
110	/*
111	* See section 4.2 in "3 Volt Fast Boot Block Flash Memory" Intel Datasheet
112	*/
113	#define FLASH_MANUFACTURER 0x00890089
114	#define FLASH_DEVICE_8mbit_TOP 0x88f188f1
115	#define FLASH_DEVICE_8mbit_BOTTOM 0x88f288f2
116	#define FLASH_DEVICE_16mbit_TOP 0x88f388f3
117	#define FLASH_DEVICE_16mbit_BOTTOM 0x88f488f4
118
119	/***************************************************************************************************/
120
121	/*
122	* The data line mapping on LART is as follows:
e5580fbe	123	*
1da177e4 LT	124	* U2 CPU \| U3 CPU
	125	* -------------------
	126	* 0 20 \| 0 12
	127	* 1 22 \| 1 14
	128	* 2 19 \| 2 11
	129	* 3 17 \| 3 9
	130	* 4 24 \| 4 0
	131	* 5 26 \| 5 2
	132	* 6 31 \| 6 7
	133	* 7 29 \| 7 5
	134	* 8 21 \| 8 13
	135	* 9 23 \| 9 15
	136	* 10 18 \| 10 10
	137	* 11 16 \| 11 8
	138	* 12 25 \| 12 1
	139	* 13 27 \| 13 3
	140	* 14 30 \| 14 6
	141	* 15 28 \| 15 4
	142	*/
	143
	144	/* Mangle data (x) */
	145	#define DATA_TO_FLASH(x) \
	146	( \
	147	(((x) & 0x08009000) >> 11) + \
	148	(((x) & 0x00002000) >> 10) + \
	149	(((x) & 0x04004000) >> 8) + \
	150	(((x) & 0x00000010) >> 4) + \
	151	(((x) & 0x91000820) >> 3) + \
	152	(((x) & 0x22080080) >> 2) + \
	153	((x) & 0x40000400) + \
	154	(((x) & 0x00040040) << 1) + \
	155	(((x) & 0x00110000) << 4) + \
	156	(((x) & 0x00220100) << 5) + \
	157	(((x) & 0x00800208) << 6) + \
	158	(((x) & 0x00400004) << 9) + \
	159	(((x) & 0x00000001) << 12) + \
	160	(((x) & 0x00000002) << 13) \
	161	)
	162
	163	/* Unmangle data (x) */
	164	#define FLASH_TO_DATA(x) \
	165	( \
	166	(((x) & 0x00010012) << 11) + \
	167	(((x) & 0x00000008) << 10) + \
	168	(((x) & 0x00040040) << 8) + \
	169	(((x) & 0x00000001) << 4) + \
	170	(((x) & 0x12200104) << 3) + \
	171	(((x) & 0x08820020) << 2) + \
	172	((x) & 0x40000400) + \
	173	(((x) & 0x00080080) >> 1) + \
	174	(((x) & 0x01100000) >> 4) + \
	175	(((x) & 0x04402000) >> 5) + \
	176	(((x) & 0x20008200) >> 6) + \
	177	(((x) & 0x80000800) >> 9) + \
	178	(((x) & 0x00001000) >> 12) + \
	179	(((x) & 0x00004000) >> 13) \
	180	)
	181
e5580fbe	182	/*
1da177e4 LT	183	* The address line mapping on LART is as follows:
	184	*
	185	* U3 CPU \| U2 CPU
	186	* -------------------
	187	* 0 2 \| 0 2
	188	* 1 3 \| 1 3
	189	* 2 9 \| 2 9
	190	* 3 13 \| 3 8
	191	* 4 8 \| 4 7
	192	* 5 12 \| 5 6
	193	* 6 11 \| 6 5
	194	* 7 10 \| 7 4
	195	* 8 4 \| 8 10
	196	* 9 5 \| 9 11
	197	* 10 6 \| 10 12
	198	* 11 7 \| 11 13
	199	*
	200	* BOOT BLOCK BOUNDARY
	201	*
	202	* 12 15 \| 12 15
	203	* 13 14 \| 13 14
	204	* 14 16 \| 14 16
e5580fbe	205	*
1da177e4 LT	206	* MAIN BLOCK BOUNDARY
	207	*
	208	* 15 17 \| 15 18
	209	* 16 18 \| 16 17
	210	* 17 20 \| 17 20
	211	* 18 19 \| 18 19
	212	* 19 21 \| 19 21
	213	*
	214	* As we can see from above, the addresses aren't mangled across
	215	* block boundaries, so we don't need to worry about address
	216	* translations except for sending/reading commands during
	217	* initialization
	218	*/
	219
	220	/* Mangle address (x) on chip U2 */
	221	#define ADDR_TO_FLASH_U2(x) \
	222	( \
	223	(((x) & 0x00000f00) >> 4) + \
	224	(((x) & 0x00042000) << 1) + \
	225	(((x) & 0x0009c003) << 2) + \
	226	(((x) & 0x00021080) << 3) + \
	227	(((x) & 0x00000010) << 4) + \
	228	(((x) & 0x00000040) << 5) + \
	229	(((x) & 0x00000024) << 7) + \
	230	(((x) & 0x00000008) << 10) \
	231	)
	232
	233	/* Unmangle address (x) on chip U2 */
	234	#define FLASH_U2_TO_ADDR(x) \
	235	( \
	236	(((x) << 4) & 0x00000f00) + \
	237	(((x) >> 1) & 0x00042000) + \
	238	(((x) >> 2) & 0x0009c003) + \
	239	(((x) >> 3) & 0x00021080) + \
	240	(((x) >> 4) & 0x00000010) + \
	241	(((x) >> 5) & 0x00000040) + \
	242	(((x) >> 7) & 0x00000024) + \
	243	(((x) >> 10) & 0x00000008) \
	244	)
	245
	246	/* Mangle address (x) on chip U3 */
	247	#define ADDR_TO_FLASH_U3(x) \
	248	( \
	249	(((x) & 0x00000080) >> 3) + \
	250	(((x) & 0x00000040) >> 1) + \
	251	(((x) & 0x00052020) << 1) + \
	252	(((x) & 0x00084f03) << 2) + \
	253	(((x) & 0x00029010) << 3) + \
	254	(((x) & 0x00000008) << 5) + \
	255	(((x) & 0x00000004) << 7) \
	256	)
	257
	258	/* Unmangle address (x) on chip U3 */
	259	#define FLASH_U3_TO_ADDR(x) \
	260	( \
	261	(((x) << 3) & 0x00000080) + \
	262	(((x) << 1) & 0x00000040) + \
	263	(((x) >> 1) & 0x00052020) + \
	264	(((x) >> 2) & 0x00084f03) + \
	265	(((x) >> 3) & 0x00029010) + \
	266	(((x) >> 5) & 0x00000008) + \
	267	(((x) >> 7) & 0x00000004) \
	268	)
	269
270	/***************************************************************************************************/
271
272	static __u8 read8 (__u32 offset)
273	{
274	volatile __u8 data = (__u8 ) (FLASH_OFFSET + offset);
275	#ifdef LART_DEBUG
cb53b3b9	276	printk (KERN_DEBUG "%s(): 0x%.8x -> 0x%.2x\n", __func__, offset, *data);
1da177e4 LT	277	#endif
	278	return (*data);
	279	}
	280
	281	static __u32 read32 (__u32 offset)
	282	{
	283	volatile __u32 data = (__u32 ) (FLASH_OFFSET + offset);
	284	#ifdef LART_DEBUG
cb53b3b9	285	printk (KERN_DEBUG "%s(): 0x%.8x -> 0x%.8x\n", __func__, offset, *data);
1da177e4 LT	286	#endif
	287	return (*data);
	288	}
	289
	290	static void write32 (__u32 x,__u32 offset)
	291	{
	292	volatile __u32 data = (__u32 ) (FLASH_OFFSET + offset);
	293	*data = x;
	294	#ifdef LART_DEBUG
cb53b3b9	295	printk (KERN_DEBUG "%s(): 0x%.8x <- 0x%.8x\n", __func__, offset, *data);
1da177e4 LT	296	#endif
	297	}
	298
	299	/***************************************************************************************************/
	300
	301	/*
	302	* Probe for 16mbit flash memory on a LART board without doing
	303	* too much damage. Since we need to write 1 dword to memory,
	304	* we're f**cked if this happens to be DRAM since we can't
	305	* restore the memory (otherwise we might exit Read Array mode).
	306	*
	307	* Returns 1 if we found 16mbit flash memory on LART, 0 otherwise.
	308	*/
	309	static int flash_probe (void)
	310	{
	311	__u32 manufacturer,devtype;
	312
	313	/* setup "Read Identifier Codes" mode */
	314	write32 (DATA_TO_FLASH (READ_ID_CODES),0x00000000);
	315
	316	/* probe U2. U2/U3 returns the same data since the first 3
	317	* address lines is mangled in the same way */
	318	manufacturer = FLASH_TO_DATA (read32 (ADDR_TO_FLASH_U2 (0x00000000)));
	319	devtype = FLASH_TO_DATA (read32 (ADDR_TO_FLASH_U2 (0x00000001)));
	320
	321	/* put the flash back into command mode */
	322	write32 (DATA_TO_FLASH (READ_ARRAY),0x00000000);
	323
0bdf77f8	324	return (manufacturer == FLASH_MANUFACTURER && (devtype == FLASH_DEVICE_16mbit_TOP \|\| devtype == FLASH_DEVICE_16mbit_BOTTOM));
1da177e4 LT	325	}
	326
	327	/*
	328	* Erase one block of flash memory at offset ``offset'' which is any
	329	* address within the block which should be erased.
	330	*
	331	* Returns 1 if successful, 0 otherwise.
	332	*/
	333	static inline int erase_block (__u32 offset)
	334	{
	335	__u32 status;
	336
	337	#ifdef LART_DEBUG
cb53b3b9	338	printk (KERN_DEBUG "%s(): 0x%.8x\n", __func__, offset);
1da177e4 LT	339	#endif
	340
	341	/* erase and confirm */
	342	write32 (DATA_TO_FLASH (ERASE_SETUP),offset);
	343	write32 (DATA_TO_FLASH (ERASE_CONFIRM),offset);
	344
	345	/* wait for block erase to finish */
	346	do
	347	{
	348	write32 (DATA_TO_FLASH (STATUS_READ),offset);
	349	status = FLASH_TO_DATA (read32 (offset));
	350	}
	351	while ((~status & STATUS_BUSY) != 0);
	352
	353	/* put the flash back into command mode */
	354	write32 (DATA_TO_FLASH (READ_ARRAY),offset);
	355
25985edc	356	/* was the erase successful? */
1da177e4 LT	357	if ((status & STATUS_ERASE_ERR))
	358	{
	359	printk (KERN_WARNING "%s: erase error at address 0x%.8x.\n",module_name,offset);
	360	return (0);
	361	}
	362
	363	return (1);
	364	}
	365
	366	static int flash_erase (struct mtd_info mtd,struct erase_info instr)
	367	{
	368	__u32 addr,len;
	369	int i,first;
	370
	371	#ifdef LART_DEBUG
cb53b3b9	372	printk (KERN_DEBUG "%s(addr = 0x%.8x, len = %d)\n", __func__, instr->addr, instr->len);
1da177e4 LT	373	#endif
	374
	375	/* sanity checks */
	376	if (instr->addr + instr->len > mtd->size) return (-EINVAL);
	377
	378	/*
	379	* check that both start and end of the requested erase are
	380	* aligned with the erasesize at the appropriate addresses.
	381	*
	382	* skip all erase regions which are ended before the start of
	383	* the requested erase. Actually, to save on the calculations,
	384	* we skip to the first erase region which starts after the
	385	* start of the requested erase, and then go back one.
	386	*/
	387	for (i = 0; i < mtd->numeraseregions && instr->addr >= mtd->eraseregions[i].offset; i++) ;
	388	i--;
	389
	390	/*
	391	* ok, now i is pointing at the erase region in which this
	392	* erase request starts. Check the start of the requested
	393	* erase range is aligned with the erase size which is in
	394	* effect here.
	395	*/
4c1e6b2c RK	396	if (i < 0 \|\| (instr->addr & (mtd->eraseregions[i].erasesize - 1)))
4c1e6b2c RK	397	return -EINVAL;
1da177e4 LT	398
	399	/* Remember the erase region we start on */
	400	first = i;
	401
	402	/*
	403	* next, check that the end of the requested erase is aligned
	404	* with the erase region at that address.
	405	*
	406	* as before, drop back one to point at the region in which
	407	* the address actually falls
	408	*/
	409	for (; i < mtd->numeraseregions && instr->addr + instr->len >= mtd->eraseregions[i].offset; i++) ;
	410	i--;
	411
	412	/* is the end aligned on a block boundary? */
4c1e6b2c RK	413	if (i < 0 \|\| ((instr->addr + instr->len) & (mtd->eraseregions[i].erasesize - 1)))
4c1e6b2c RK	414	return -EINVAL;
1da177e4 LT	415
	416	addr = instr->addr;
	417	len = instr->len;
	418
	419	i = first;
	420
	421	/* now erase those blocks */
	422	while (len)
	423	{
	424	if (!erase_block (addr))
	425	{
	426	instr->state = MTD_ERASE_FAILED;
	427	return (-EIO);
	428	}
	429
	430	addr += mtd->eraseregions[i].erasesize;
	431	len -= mtd->eraseregions[i].erasesize;
	432
	433	if (addr == mtd->eraseregions[i].offset + (mtd->eraseregions[i].erasesize * mtd->eraseregions[i].numblocks)) i++;
	434	}
	435
	436	instr->state = MTD_ERASE_DONE;
	437	mtd_erase_callback(instr);
	438
	439	return (0);
	440	}
	441
	442	static int flash_read (struct mtd_info mtd,loff_t from,size_t len,size_t retlen,u_char *buf)
	443	{
	444	#ifdef LART_DEBUG
cb53b3b9	445	printk (KERN_DEBUG "%s(from = 0x%.8x, len = %d)\n", __func__, (__u32)from, len);
1da177e4 LT	446	#endif
	447
	448	/* sanity checks */
	449	if (!len) return (0);
	450	if (from + len > mtd->size) return (-EINVAL);
	451
	452	/* we always read len bytes */
	453	*retlen = len;
	454
	455	/* first, we read bytes until we reach a dword boundary */
	456	if (from & (BUSWIDTH - 1))
	457	{
	458	int gap = BUSWIDTH - (from & (BUSWIDTH - 1));
	459
	460	while (len && gap--) *buf++ = read8 (from++), len--;
	461	}
	462
	463	/* now we read dwords until we reach a non-dword boundary */
	464	while (len >= BUSWIDTH)
	465	{
	466	((__u32 ) buf) = read32 (from);
	467
	468	buf += BUSWIDTH;
	469	from += BUSWIDTH;
	470	len -= BUSWIDTH;
	471	}
	472
	473	/* top up the last unaligned bytes */
	474	if (len & (BUSWIDTH - 1))
	475	while (len--) *buf++ = read8 (from++);
	476
	477	return (0);
	478	}
	479
	480	/*
	481	* Write one dword ``x'' to flash memory at offset ``offset''. ``offset''
	482	* must be 32 bits, i.e. it must be on a dword boundary.
	483	*
	484	* Returns 1 if successful, 0 otherwise.
	485	*/
	486	static inline int write_dword (__u32 offset,__u32 x)
	487	{
	488	__u32 status;
	489
	490	#ifdef LART_DEBUG
cb53b3b9	491	printk (KERN_DEBUG "%s(): 0x%.8x <- 0x%.8x\n", __func__, offset, x);
1da177e4 LT	492	#endif
	493
	494	/* setup writing */
	495	write32 (DATA_TO_FLASH (PGM_SETUP),offset);
	496
	497	/* write the data */
	498	write32 (x,offset);
	499
	500	/* wait for the write to finish */
	501	do
	502	{
	503	write32 (DATA_TO_FLASH (STATUS_READ),offset);
	504	status = FLASH_TO_DATA (read32 (offset));
	505	}
	506	while ((~status & STATUS_BUSY) != 0);
	507
	508	/* put the flash back into command mode */
	509	write32 (DATA_TO_FLASH (READ_ARRAY),offset);
	510
25985edc	511	/* was the write successful? */
1da177e4 LT	512	if ((status & STATUS_PGM_ERR) \|\| read32 (offset) != x)
	513	{
	514	printk (KERN_WARNING "%s: write error at address 0x%.8x.\n",module_name,offset);
	515	return (0);
	516	}
	517
	518	return (1);
	519	}
	520
	521	static int flash_write (struct mtd_info mtd,loff_t to,size_t len,size_t retlen,const u_char *buf)
	522	{
	523	__u8 tmp[4];
	524	int i,n;
	525
	526	#ifdef LART_DEBUG
cb53b3b9	527	printk (KERN_DEBUG "%s(to = 0x%.8x, len = %d)\n", __func__, (__u32)to, len);
1da177e4 LT	528	#endif
	529
	530	*retlen = 0;
	531
	532	/* sanity checks */
	533	if (!len) return (0);
	534	if (to + len > mtd->size) return (-EINVAL);
	535
	536	/* first, we write a 0xFF.... padded byte until we reach a dword boundary */
	537	if (to & (BUSWIDTH - 1))
	538	{
	539	__u32 aligned = to & ~(BUSWIDTH - 1);
	540	int gap = to - aligned;
	541
	542	i = n = 0;
	543
	544	while (gap--) tmp[i++] = 0xFF;
	545	while (len && i < BUSWIDTH) tmp[i++] = buf[n++], len--;
	546	while (i < BUSWIDTH) tmp[i++] = 0xFF;
	547
	548	if (!write_dword (aligned,((__u32 ) tmp))) return (-EIO);
	549
	550	to += n;
	551	buf += n;
	552	*retlen += n;
	553	}
	554
	555	/* now we write dwords until we reach a non-dword boundary */
	556	while (len >= BUSWIDTH)
	557	{
	558	if (!write_dword (to,((__u32 ) buf))) return (-EIO);
	559
	560	to += BUSWIDTH;
	561	buf += BUSWIDTH;
	562	*retlen += BUSWIDTH;
	563	len -= BUSWIDTH;
	564	}
	565
	566	/* top up the last unaligned bytes, padded with 0xFF.... */
	567	if (len & (BUSWIDTH - 1))
	568	{
	569	i = n = 0;
	570
	571	while (len--) tmp[i++] = buf[n++];
	572	while (i < BUSWIDTH) tmp[i++] = 0xFF;
	573
	574	if (!write_dword (to,((__u32 ) tmp))) return (-EIO);
	575
	576	*retlen += n;
	577	}
	578
	579	return (0);
	580	}
	581
	582	/***************************************************************************************************/
	583
1da177e4 LT	584	static struct mtd_info mtd;
	585
	586	static struct mtd_erase_region_info erase_regions[] = {
	587	/* parameter blocks */
	588	{
	589	.offset = 0x00000000,
	590	.erasesize = FLASH_BLOCKSIZE_PARAM,
	591	.numblocks = FLASH_NUMBLOCKS_16m_PARAM,
	592	},
	593	/* main blocks */
	594	{
	595	.offset = FLASH_BLOCKSIZE_PARAM * FLASH_NUMBLOCKS_16m_PARAM,
	596	.erasesize = FLASH_BLOCKSIZE_MAIN,
	597	.numblocks = FLASH_NUMBLOCKS_16m_MAIN,
	598	}
	599	};
	600
	601	#ifdef HAVE_PARTITIONS
	602	static struct mtd_partition lart_partitions[] = {
	603	/* blob */
	604	{
	605	.name = "blob",
	606	.offset = BLOB_START,
	607	.size = BLOB_LEN,
	608	},
	609	/* kernel */
	610	{
	611	.name = "kernel",
	612	.offset = KERNEL_START, /* MTDPART_OFS_APPEND */
	613	.size = KERNEL_LEN,
	614	},
	615	/* initial ramdisk / file system */
	616	{
	617	.name = "file system",
	618	.offset = INITRD_START, /* MTDPART_OFS_APPEND */
	619	.size = INITRD_LEN, /* MTDPART_SIZ_FULL */
	620	}
	621	};
	622	#endif
	623
e4582ea7	624	static int __init lart_flash_init (void)
1da177e4 LT	625	{
	626	int result;
	627	memset (&mtd,0,sizeof (mtd));
	628	printk ("MTD driver for LART. Written by Abraham vd Merwe <abraham@2d3d.co.za>\n");
	629	printk ("%s: Probing for 28F160x3 flash on LART...\n",module_name);
	630	if (!flash_probe ())
	631	{
	632	printk (KERN_WARNING "%s: Found no LART compatible flash device\n",module_name);
	633	return (-ENXIO);
	634	}
	635	printk ("%s: This looks like a LART board to me.\n",module_name);
	636	mtd.name = module_name;
	637	mtd.type = MTD_NORFLASH;
783ed81f	638	mtd.writesize = 1;
1da177e4 LT	639	mtd.flags = MTD_CAP_NORFLASH;
	640	mtd.size = FLASH_BLOCKSIZE_PARAM * FLASH_NUMBLOCKS_16m_PARAM + FLASH_BLOCKSIZE_MAIN * FLASH_NUMBLOCKS_16m_MAIN;
	641	mtd.erasesize = FLASH_BLOCKSIZE_MAIN;
87d10f3c	642	mtd.numeraseregions = ARRAY_SIZE(erase_regions);
1da177e4 LT	643	mtd.eraseregions = erase_regions;
	644	mtd.erase = flash_erase;
	645	mtd.read = flash_read;
	646	mtd.write = flash_write;
	647	mtd.owner = THIS_MODULE;
	648
	649	#ifdef LART_DEBUG
	650	printk (KERN_DEBUG
	651	"mtd.name = %s\n"
	652	"mtd.size = 0x%.8x (%uM)\n"
	653	"mtd.erasesize = 0x%.8x (%uK)\n"
	654	"mtd.numeraseregions = %d\n",
	655	mtd.name,
	656	mtd.size,mtd.size / (1024*1024),
	657	mtd.erasesize,mtd.erasesize / 1024,
	658	mtd.numeraseregions);
	659
	660	if (mtd.numeraseregions)
	661	for (result = 0; result < mtd.numeraseregions; result++)
	662	printk (KERN_DEBUG
	663	"\n\n"
	664	"mtd.eraseregions[%d].offset = 0x%.8x\n"
	665	"mtd.eraseregions[%d].erasesize = 0x%.8x (%uK)\n"
	666	"mtd.eraseregions[%d].numblocks = %d\n",
	667	result,mtd.eraseregions[result].offset,
	668	result,mtd.eraseregions[result].erasesize,mtd.eraseregions[result].erasesize / 1024,
	669	result,mtd.eraseregions[result].numblocks);
	670
	671	#ifdef HAVE_PARTITIONS
87d10f3c	672	printk ("\npartitions = %d\n", ARRAY_SIZE(lart_partitions));
1da177e4	673
87d10f3c	674	for (result = 0; result < ARRAY_SIZE(lart_partitions); result++)
1da177e4 LT	675	printk (KERN_DEBUG
	676	"\n\n"
	677	"lart_partitions[%d].name = %s\n"
	678	"lart_partitions[%d].offset = 0x%.8x\n"
	679	"lart_partitions[%d].size = 0x%.8x (%uK)\n",
	680	result,lart_partitions[result].name,
	681	result,lart_partitions[result].offset,
	682	result,lart_partitions[result].size,lart_partitions[result].size / 1024);
	683	#endif
	684	#endif
	685
	686	#ifndef HAVE_PARTITIONS
	687	result = add_mtd_device (&mtd);
	688	#else
87d10f3c	689	result = add_mtd_partitions (&mtd,lart_partitions, ARRAY_SIZE(lart_partitions));
1da177e4 LT	690	#endif
	691
	692	return (result);
	693	}
	694
e4582ea7	695	static void __exit lart_flash_exit (void)
1da177e4 LT	696	{
	697	#ifndef HAVE_PARTITIONS
	698	del_mtd_device (&mtd);
	699	#else
	700	del_mtd_partitions (&mtd);
	701	#endif
	702	}
	703
	704	module_init (lart_flash_init);
	705	module_exit (lart_flash_exit);
	706
	707	MODULE_LICENSE("GPL");
	708	MODULE_AUTHOR("Abraham vd Merwe <abraham@2d3d.co.za>");
	709	MODULE_DESCRIPTION("MTD driver for Intel 28F160F3 on LART board");