[mirror_ubuntu-artful-kernel.git] / arch / cris / arch-v32 / drivers / axisflashmap.c

/*
 * Physical mapping layer for MTD using the Axis partitiontable format
 *
 * Copyright (c) 2001-2007 Axis Communications AB
 *
 * This file is under the GPL.
 *
 * First partition is always sector 0 regardless of if we find a partitiontable
 * or not. In the start of the next sector, there can be a partitiontable that
 * tells us what other partitions to define. If there isn't, we use a default
 * partition split defined below.
 *
 */

#include <linux/module.h>
#include <linux/types.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/slab.h>

#include <linux/mtd/concat.h>
#include <linux/mtd/map.h>
#include <linux/mtd/mtd.h>
#include <linux/mtd/mtdram.h>
#include <linux/mtd/partitions.h>

#include <asm/axisflashmap.h>
#include <asm/mmu.h>

#define MEM_CSE0_SIZE (0x04000000)
#define MEM_CSE1_SIZE (0x04000000)

#define FLASH_UNCACHED_ADDR  KSEG_E
#define FLASH_CACHED_ADDR    KSEG_F

#define PAGESIZE (512)

#if CONFIG_ETRAX_FLASH_BUSWIDTH==1
#define flash_data __u8
#elif CONFIG_ETRAX_FLASH_BUSWIDTH==2
#define flash_data __u16
#elif CONFIG_ETRAX_FLASH_BUSWIDTH==4
#define flash_data __u32
#endif

/* From head.S */
extern unsigned long romfs_in_flash; /* 1 when romfs_start, _length in flash */
extern unsigned long romfs_start, romfs_length;
extern unsigned long nand_boot; /* 1 when booted from nand flash */

struct partition_name {
	char name[6];
};

/* The master mtd for the entire flash. */
struct mtd_info* axisflash_mtd = NULL;

/* Map driver functions. */

static map_word flash_read(struct map_info *map, unsigned long ofs)
{
	map_word tmp;
	tmp.x[0] = *(flash_data *)(map->map_priv_1 + ofs);
	return tmp;
}

static void flash_copy_from(struct map_info *map, void *to,
			    unsigned long from, ssize_t len)
{
	memcpy(to, (void *)(map->map_priv_1 + from), len);
}

static void flash_write(struct map_info *map, map_word d, unsigned long adr)
{
	*(flash_data *)(map->map_priv_1 + adr) = (flash_data)d.x[0];
}

/*
 * The map for chip select e0.
 *
 * We run into tricky coherence situations if we mix cached with uncached
 * accesses to we only use the uncached version here.
 *
 * The size field is the total size where the flash chips may be mapped on the
 * chip select. MTD probes should find all devices there and it does not matter
 * if there are unmapped gaps or aliases (mirrors of flash devices). The MTD
 * probes will ignore them.
 *
 * The start address in map_priv_1 is in virtual memory so we cannot use
 * MEM_CSE0_START but must rely on that FLASH_UNCACHED_ADDR is the start
 * address of cse0.
 */
static struct map_info map_cse0 = {
	.name = "cse0",
	.size = MEM_CSE0_SIZE,
	.bankwidth = CONFIG_ETRAX_FLASH_BUSWIDTH,
	.read = flash_read,
	.copy_from = flash_copy_from,
	.write = flash_write,
	.map_priv_1 = FLASH_UNCACHED_ADDR
};

/*
 * The map for chip select e1.
 *
 * If there was a gap between cse0 and cse1, map_priv_1 would get the wrong
 * address, but there isn't.
 */
static struct map_info map_cse1 = {
	.name = "cse1",
	.size = MEM_CSE1_SIZE,
	.bankwidth = CONFIG_ETRAX_FLASH_BUSWIDTH,
	.read = flash_read,
	.copy_from = flash_copy_from,
	.write = flash_write,
	.map_priv_1 = FLASH_UNCACHED_ADDR + MEM_CSE0_SIZE
};

#define MAX_PARTITIONS			7
#ifdef CONFIG_ETRAX_NANDBOOT
#define NUM_DEFAULT_PARTITIONS		4
#define DEFAULT_ROOTFS_PARTITION_NO	2
#define DEFAULT_MEDIA_SIZE              0x2000000 /* 32 megs */
#else
#define NUM_DEFAULT_PARTITIONS		3
#define DEFAULT_ROOTFS_PARTITION_NO	(-1)
#define DEFAULT_MEDIA_SIZE              0x800000 /* 8 megs */
#endif

#if (MAX_PARTITIONS < NUM_DEFAULT_PARTITIONS)
#error MAX_PARTITIONS must be >= than NUM_DEFAULT_PARTITIONS
#endif

/* Initialize the ones normally used. */
static struct mtd_partition axis_partitions[MAX_PARTITIONS] = {
	{
		.name = "part0",
		.size = CONFIG_ETRAX_PTABLE_SECTOR,
		.offset = 0
	},
	{
		.name = "part1",
		.size = 0,
		.offset = 0
	},
	{
		.name = "part2",
		.size = 0,
		.offset = 0
	},
	{
		.name = "part3",
		.size = 0,
		.offset = 0
	},
	{
		.name = "part4",
		.size = 0,
		.offset = 0
	},
	{
		.name = "part5",
		.size = 0,
		.offset = 0
	},
	{
		.name = "part6",
		.size = 0,
		.offset = 0
	},
};


/* If no partition-table was found, we use this default-set.
 * Default flash size is 8MB (NOR). CONFIG_ETRAX_PTABLE_SECTOR is most
 * likely the size of one flash block and "filesystem"-partition needs
 * to be >=5 blocks to be able to use JFFS.
 */
static struct mtd_partition axis_default_partitions[NUM_DEFAULT_PARTITIONS] = {
	{
		.name = "boot firmware",
		.size = CONFIG_ETRAX_PTABLE_SECTOR,
		.offset = 0
	},
	{
		.name = "kernel",
		.size = 10 * CONFIG_ETRAX_PTABLE_SECTOR,
		.offset = CONFIG_ETRAX_PTABLE_SECTOR
	},
#define FILESYSTEM_SECTOR (11 * CONFIG_ETRAX_PTABLE_SECTOR)
#ifdef CONFIG_ETRAX_NANDBOOT
	{
		.name = "rootfs",
		.size = 10 * CONFIG_ETRAX_PTABLE_SECTOR,
		.offset = FILESYSTEM_SECTOR
	},
#undef FILESYSTEM_SECTOR
#define FILESYSTEM_SECTOR (21 * CONFIG_ETRAX_PTABLE_SECTOR)
#endif
	{
		.name = "rwfs",
		.size = DEFAULT_MEDIA_SIZE - FILESYSTEM_SECTOR,
		.offset = FILESYSTEM_SECTOR
	}
};

#ifdef CONFIG_ETRAX_AXISFLASHMAP_MTD0WHOLE
/* Main flash device */
static struct mtd_partition main_partition = {
	.name = "main",
	.size = 0,
	.offset = 0
};
#endif

/* Auxiliary partition if we find another flash */
static struct mtd_partition aux_partition = {
	.name = "aux",
	.size = 0,
	.offset = 0
};

/*
 * Probe a chip select for AMD-compatible (JEDEC) or CFI-compatible flash
 * chips in that order (because the amd_flash-driver is faster).
 */
static struct mtd_info *probe_cs(struct map_info *map_cs)
{
	struct mtd_info *mtd_cs = NULL;

	printk(KERN_INFO
	       "%s: Probing a 0x%08lx bytes large window at 0x%08lx.\n",
	       map_cs->name, map_cs->size, map_cs->map_priv_1);

#ifdef CONFIG_MTD_CFI
	mtd_cs = do_map_probe("cfi_probe", map_cs);
#endif
#ifdef CONFIG_MTD_JEDECPROBE
	if (!mtd_cs)
		mtd_cs = do_map_probe("jedec_probe", map_cs);
#endif

	return mtd_cs;
}

/*
 * Probe each chip select individually for flash chips. If there are chips on
 * both cse0 and cse1, the mtd_info structs will be concatenated to one struct
 * so that MTD partitions can cross chip boundries.
 *
 * The only known restriction to how you can mount your chips is that each
 * chip select must hold similar flash chips. But you need external hardware
 * to do that anyway and you can put totally different chips on cse0 and cse1
 * so it isn't really much of a restriction.
 */
extern struct mtd_info* __init crisv32_nand_flash_probe (void);
static struct mtd_info *flash_probe(void)
{
	struct mtd_info *mtd_cse0;
	struct mtd_info *mtd_cse1;
	struct mtd_info *mtd_total;
	struct mtd_info *mtds[2];
	int count = 0;

	if ((mtd_cse0 = probe_cs(&map_cse0)) != NULL)
		mtds[count++] = mtd_cse0;
	if ((mtd_cse1 = probe_cs(&map_cse1)) != NULL)
		mtds[count++] = mtd_cse1;

	if (!mtd_cse0 && !mtd_cse1) {
		/* No chip found. */
		return NULL;
	}

	if (count > 1) {
		/* Since the concatenation layer adds a small overhead we
		 * could try to figure out if the chips in cse0 and cse1 are
		 * identical and reprobe the whole cse0+cse1 window. But since
		 * flash chips are slow, the overhead is relatively small.
		 * So we use the MTD concatenation layer instead of further
		 * complicating the probing procedure.
		 */
		mtd_total = mtd_concat_create(mtds, count, "cse0+cse1");
		if (!mtd_total) {
			printk(KERN_ERR "%s and %s: Concatenation failed!\n",
				map_cse0.name, map_cse1.name);

			/* The best we can do now is to only use what we found
			 * at cse0. */
			mtd_total = mtd_cse0;
			map_destroy(mtd_cse1);
		}
	} else
		mtd_total = mtd_cse0 ? mtd_cse0 : mtd_cse1;

	return mtd_total;
}

/*
 * Probe the flash chip(s) and, if it succeeds, read the partition-table
 * and register the partitions with MTD.
 */
static int __init init_axis_flash(void)
{
	struct mtd_info *main_mtd;
	struct mtd_info *aux_mtd = NULL;
	int err = 0;
	int pidx = 0;
	struct partitiontable_head *ptable_head = NULL;
	struct partitiontable_entry *ptable;
	int ptable_ok = 0;
	static char page[PAGESIZE];
	size_t len;
	int ram_rootfs_partition = -1; /* -1 => no RAM rootfs partition */
	int part;
	struct mtd_partition *partition;

	/* We need a root fs. If it resides in RAM, we need to use an
	 * MTDRAM device, so it must be enabled in the kernel config,
	 * but its size must be configured as 0 so as not to conflict
	 * with our usage.
	 */
#if !defined(CONFIG_MTD_MTDRAM) || (CONFIG_MTDRAM_TOTAL_SIZE != 0) || (CONFIG_MTDRAM_ABS_POS != 0)
	if (!romfs_in_flash && !nand_boot) {
		printk(KERN_EMERG "axisflashmap: Cannot create an MTD RAM "
		       "device; configure CONFIG_MTD_MTDRAM with size = 0!\n");
		panic("This kernel cannot boot from RAM!\n");
	}
#endif

	main_mtd = flash_probe();
	if (main_mtd)
		printk(KERN_INFO "%s: 0x%08llx bytes of NOR flash memory.\n",
		       main_mtd->name, main_mtd->size);

#ifdef CONFIG_ETRAX_NANDFLASH
	aux_mtd = crisv32_nand_flash_probe();
	if (aux_mtd)
		printk(KERN_INFO "%s: 0x%08x bytes of NAND flash memory.\n",
			aux_mtd->name, aux_mtd->size);

#ifdef CONFIG_ETRAX_NANDBOOT
	{
		struct mtd_info *tmp_mtd;

		printk(KERN_INFO "axisflashmap: Set to boot from NAND flash, "
		       "making NAND flash primary device.\n");
		tmp_mtd = main_mtd;
		main_mtd = aux_mtd;
		aux_mtd = tmp_mtd;
	}
#endif /* CONFIG_ETRAX_NANDBOOT */
#endif /* CONFIG_ETRAX_NANDFLASH */

	if (!main_mtd && !aux_mtd) {
		/* There's no reason to use this module if no flash chip can
		 * be identified. Make sure that's understood.
		 */
		printk(KERN_INFO "axisflashmap: Found no flash chip.\n");
	}

#if 0 /* Dump flash memory so we can see what is going on */
	if (main_mtd) {
		int sectoraddr, i;
		for (sectoraddr = 0; sectoraddr < 2*65536+4096;
				sectoraddr += PAGESIZE) {
			main_mtd->read(main_mtd, sectoraddr, PAGESIZE, &len,
				page);
			printk(KERN_INFO
			       "Sector at %d (length %d):\n",
			       sectoraddr, len);
			for (i = 0; i < PAGESIZE; i += 16) {
				printk(KERN_INFO
				       "%02x %02x %02x %02x "
				       "%02x %02x %02x %02x "
				       "%02x %02x %02x %02x "
				       "%02x %02x %02x %02x\n",
				       page[i] & 255, page[i+1] & 255,
				       page[i+2] & 255, page[i+3] & 255,
				       page[i+4] & 255, page[i+5] & 255,
				       page[i+6] & 255, page[i+7] & 255,
				       page[i+8] & 255, page[i+9] & 255,
				       page[i+10] & 255, page[i+11] & 255,
				       page[i+12] & 255, page[i+13] & 255,
				       page[i+14] & 255, page[i+15] & 255);
			}
		}
	}
#endif

	if (main_mtd) {
		loff_t ptable_sector = CONFIG_ETRAX_PTABLE_SECTOR;
		main_mtd->owner = THIS_MODULE;
		axisflash_mtd = main_mtd;


		/* First partition (rescue) is always set to the default. */
		pidx++;
#ifdef CONFIG_ETRAX_NANDBOOT
		/* We know where the partition table should be located,
		 * it will be in first good block after that.
		 */
		int blockstat;
		do {
			blockstat = mtd_block_isbad(main_mtd, ptable_sector);
			if (blockstat < 0)
				ptable_sector = 0; /* read error */
			else if (blockstat)
				ptable_sector += main_mtd->erasesize;
		} while (blockstat && ptable_sector);
#endif
		if (ptable_sector) {
			mtd_read(main_mtd, ptable_sector, PAGESIZE, &len,
				 page);
			ptable_head = &((struct partitiontable *) page)->head;
		}

#if 0 /* Dump partition table so we can see what is going on */
		printk(KERN_INFO
		       "axisflashmap: flash read %d bytes at 0x%08x, data: "
		       "%02x %02x %02x %02x %02x %02x %02x %02x\n",
		       len, CONFIG_ETRAX_PTABLE_SECTOR,
		       page[0] & 255, page[1] & 255,
		       page[2] & 255, page[3] & 255,
		       page[4] & 255, page[5] & 255,
		       page[6] & 255, page[7] & 255);
		printk(KERN_INFO
		       "axisflashmap: partition table offset %d, data: "
		       "%02x %02x %02x %02x %02x %02x %02x %02x\n",
		       PARTITION_TABLE_OFFSET,
		       page[PARTITION_TABLE_OFFSET+0] & 255,
		       page[PARTITION_TABLE_OFFSET+1] & 255,
		       page[PARTITION_TABLE_OFFSET+2] & 255,
		       page[PARTITION_TABLE_OFFSET+3] & 255,
		       page[PARTITION_TABLE_OFFSET+4] & 255,
		       page[PARTITION_TABLE_OFFSET+5] & 255,
		       page[PARTITION_TABLE_OFFSET+6] & 255,
		       page[PARTITION_TABLE_OFFSET+7] & 255);
#endif
	}

	if (ptable_head && (ptable_head->magic == PARTITION_TABLE_MAGIC)
	    && (ptable_head->size <
		(MAX_PARTITIONS * sizeof(struct partitiontable_entry) +
		PARTITIONTABLE_END_MARKER_SIZE))
	    && (*(unsigned long*)((void*)ptable_head + sizeof(*ptable_head) +
				  ptable_head->size -
				  PARTITIONTABLE_END_MARKER_SIZE)
		== PARTITIONTABLE_END_MARKER)) {
		/* Looks like a start, sane length and end of a
		 * partition table, lets check csum etc.
		 */
		struct partitiontable_entry *max_addr =
			(struct partitiontable_entry *)
			((unsigned long)ptable_head + sizeof(*ptable_head) +
			 ptable_head->size);
		unsigned long offset = CONFIG_ETRAX_PTABLE_SECTOR;
		unsigned char *p;
		unsigned long csum = 0;

		ptable = (struct partitiontable_entry *)
			((unsigned long)ptable_head + sizeof(*ptable_head));

		/* Lets be PARANOID, and check the checksum. */
		p = (unsigned char*) ptable;

		while (p <= (unsigned char*)max_addr) {
			csum += *p++;
			csum += *p++;
			csum += *p++;
			csum += *p++;
		}
		ptable_ok = (csum == ptable_head->checksum);

		/* Read the entries and use/show the info.  */
		printk(KERN_INFO "axisflashmap: "
		       "Found a%s partition table at 0x%p-0x%p.\n",
		       (ptable_ok ? " valid" : "n invalid"), ptable_head,
		       max_addr);

		/* We have found a working bootblock.  Now read the
		 * partition table.  Scan the table.  It ends with 0xffffffff.
		 */
		while (ptable_ok
		       && ptable->offset != PARTITIONTABLE_END_MARKER
		       && ptable < max_addr
		       && pidx < MAX_PARTITIONS - 1) {

			axis_partitions[pidx].offset = offset + ptable->offset;
#ifdef CONFIG_ETRAX_NANDFLASH
			if (main_mtd->type == MTD_NANDFLASH) {
				axis_partitions[pidx].size =
					(((ptable+1)->offset ==
					  PARTITIONTABLE_END_MARKER) ?
					  main_mtd->size :
					  ((ptable+1)->offset + offset)) -
					(ptable->offset + offset);

			} else
#endif /* CONFIG_ETRAX_NANDFLASH */
				axis_partitions[pidx].size = ptable->size;
#ifdef CONFIG_ETRAX_NANDBOOT
			/* Save partition number of jffs2 ro partition.
			 * Needed if RAM booting or root file system in RAM.
			 */
			if (!nand_boot &&
			    ram_rootfs_partition < 0 && /* not already set */
			    ptable->type == PARTITION_TYPE_JFFS2 &&
			    (ptable->flags & PARTITION_FLAGS_READONLY_MASK) ==
				PARTITION_FLAGS_READONLY)
				ram_rootfs_partition = pidx;
#endif /* CONFIG_ETRAX_NANDBOOT */
			pidx++;
			ptable++;
		}
	}

	/* Decide whether to use default partition table. */
	/* Only use default table if we actually have a device (main_mtd) */

	partition = &axis_partitions[0];
	if (main_mtd && !ptable_ok) {
		memcpy(axis_partitions, axis_default_partitions,
		       sizeof(axis_default_partitions));
		pidx = NUM_DEFAULT_PARTITIONS;
		ram_rootfs_partition = DEFAULT_ROOTFS_PARTITION_NO;
	}

	/* Add artificial partitions for rootfs if necessary */
	if (romfs_in_flash) {
		/* rootfs is in directly accessible flash memory = NOR flash.
		   Add an overlapping device for the rootfs partition. */
		printk(KERN_INFO "axisflashmap: Adding partition for "
		       "overlapping root file system image\n");
		axis_partitions[pidx].size = romfs_length;
		axis_partitions[pidx].offset = romfs_start - FLASH_CACHED_ADDR;
		axis_partitions[pidx].name = "romfs";
		axis_partitions[pidx].mask_flags |= MTD_WRITEABLE;
		ram_rootfs_partition = -1;
		pidx++;
	} else if (romfs_length && !nand_boot) {
		/* romfs exists in memory, but not in flash, so must be in RAM.
		 * Configure an MTDRAM partition. */
		if (ram_rootfs_partition < 0) {
			/* None set yet, put it at the end */
			ram_rootfs_partition = pidx;
			pidx++;
		}
		printk(KERN_INFO "axisflashmap: Adding partition for "
		       "root file system image in RAM\n");
		axis_partitions[ram_rootfs_partition].size = romfs_length;
		axis_partitions[ram_rootfs_partition].offset = romfs_start;
		axis_partitions[ram_rootfs_partition].name = "romfs";
		axis_partitions[ram_rootfs_partition].mask_flags |=
			MTD_WRITEABLE;
	}

#ifdef CONFIG_ETRAX_AXISFLASHMAP_MTD0WHOLE
	if (main_mtd) {
		main_partition.size = main_mtd->size;
		err = mtd_device_register(main_mtd, &main_partition, 1);
		if (err)
			panic("axisflashmap: Could not initialize "
			      "partition for whole main mtd device!\n");
	}
#endif

	/* Now, register all partitions with mtd.
	 * We do this one at a time so we can slip in an MTDRAM device
	 * in the proper place if required. */

	for (part = 0; part < pidx; part++) {
		if (part == ram_rootfs_partition) {
			/* add MTDRAM partition here */
			struct mtd_info *mtd_ram;

			mtd_ram = kmalloc(sizeof(struct mtd_info), GFP_KERNEL);
			if (!mtd_ram)
				panic("axisflashmap: Couldn't allocate memory "
				      "for mtd_info!\n");
			printk(KERN_INFO "axisflashmap: Adding RAM partition "
			       "for rootfs image.\n");
			err = mtdram_init_device(mtd_ram,
						 (void *)(u_int32_t)partition[part].offset,
						 partition[part].size,
						 partition[part].name);
			if (err)
				panic("axisflashmap: Could not initialize "
				      "MTD RAM device!\n");
			/* JFFS2 likes to have an erasesize. Keep potential
			 * JFFS2 rootfs happy by providing one. Since image
			 * was most likely created for main mtd, use that
			 * erasesize, if available. Otherwise, make a guess. */
			mtd_ram->erasesize = (main_mtd ? main_mtd->erasesize :
				CONFIG_ETRAX_PTABLE_SECTOR);
		} else {
			err = mtd_device_register(main_mtd, &partition[part],
						  1);
			if (err)
				panic("axisflashmap: Could not add mtd "
					"partition %d\n", part);
		}
	}

	if (aux_mtd) {
		aux_partition.size = aux_mtd->size;
		err = mtd_device_register(aux_mtd, &aux_partition, 1);
		if (err)
			panic("axisflashmap: Could not initialize "
			      "aux mtd device!\n");

	}

	return err;
}

/* This adds the above to the kernels init-call chain. */
module_init(init_axis_flash);

EXPORT_SYMBOL(axisflash_mtd);
Commit	Line	Data
51533b61 MS	1	/*
	2	* Physical mapping layer for MTD using the Axis partitiontable format
	3	*
5fc1f312	4	* Copyright (c) 2001-2007 Axis Communications AB
51533b61 MS	5	*
	6	* This file is under the GPL.
	7	*
	8	* First partition is always sector 0 regardless of if we find a partitiontable
	9	* or not. In the start of the next sector, there can be a partitiontable that
	10	* tells us what other partitions to define. If there isn't, we use a default
	11	* partition split defined below.
	12	*
51533b61 MS	13	*/
	14
	15	#include <linux/module.h>
	16	#include <linux/types.h>
	17	#include <linux/kernel.h>
51533b61	18	#include <linux/init.h>
4e57b681	19	#include <linux/slab.h>
51533b61 MS	20
	21	#include <linux/mtd/concat.h>
	22	#include <linux/mtd/map.h>
	23	#include <linux/mtd/mtd.h>
	24	#include <linux/mtd/mtdram.h>
	25	#include <linux/mtd/partitions.h>
	26
51533b61 MS	27	#include <asm/axisflashmap.h>
	28	#include <asm/mmu.h>
	29
	30	#define MEM_CSE0_SIZE (0x04000000)
	31	#define MEM_CSE1_SIZE (0x04000000)
	32
	33	#define FLASH_UNCACHED_ADDR KSEG_E
	34	#define FLASH_CACHED_ADDR KSEG_F
	35
5fc1f312 JN	36	#define PAGESIZE (512)
5fc1f312 JN	37
51533b61 MS	38	#if CONFIG_ETRAX_FLASH_BUSWIDTH==1
	39	#define flash_data __u8
	40	#elif CONFIG_ETRAX_FLASH_BUSWIDTH==2
	41	#define flash_data __u16
	42	#elif CONFIG_ETRAX_FLASH_BUSWIDTH==4
5fc1f312	43	#define flash_data __u32
51533b61 MS	44	#endif
	45
	46	/* From head.S */
5fc1f312 JN	47	extern unsigned long romfs_in_flash; /* 1 when romfs_start, _length in flash */
	48	extern unsigned long romfs_start, romfs_length;
	49	extern unsigned long nand_boot; /* 1 when booted from nand flash */
	50
	51	struct partition_name {
	52	char name[6];
	53	};
51533b61 MS	54
	55	/* The master mtd for the entire flash. */
	56	struct mtd_info* axisflash_mtd = NULL;
	57
	58	/* Map driver functions. */
	59
	60	static map_word flash_read(struct map_info *map, unsigned long ofs)
	61	{
	62	map_word tmp;
	63	tmp.x[0] = (flash_data )(map->map_priv_1 + ofs);
	64	return tmp;
	65	}
	66
	67	static void flash_copy_from(struct map_info map, void to,
	68	unsigned long from, ssize_t len)
	69	{
	70	memcpy(to, (void *)(map->map_priv_1 + from), len);
	71	}
	72
	73	static void flash_write(struct map_info *map, map_word d, unsigned long adr)
	74	{
	75	(flash_data )(map->map_priv_1 + adr) = (flash_data)d.x[0];
	76	}
	77
	78	/*
	79	* The map for chip select e0.
	80	*
	81	* We run into tricky coherence situations if we mix cached with uncached
	82	* accesses to we only use the uncached version here.
	83	*
	84	* The size field is the total size where the flash chips may be mapped on the
	85	* chip select. MTD probes should find all devices there and it does not matter
	86	* if there are unmapped gaps or aliases (mirrors of flash devices). The MTD
	87	* probes will ignore them.
	88	*
	89	* The start address in map_priv_1 is in virtual memory so we cannot use
	90	* MEM_CSE0_START but must rely on that FLASH_UNCACHED_ADDR is the start
	91	* address of cse0.
	92	*/
	93	static struct map_info map_cse0 = {
	94	.name = "cse0",
	95	.size = MEM_CSE0_SIZE,
	96	.bankwidth = CONFIG_ETRAX_FLASH_BUSWIDTH,
	97	.read = flash_read,
	98	.copy_from = flash_copy_from,
	99	.write = flash_write,
	100	.map_priv_1 = FLASH_UNCACHED_ADDR
	101	};
	102
	103	/*
	104	* The map for chip select e1.
	105	*
	106	* If there was a gap between cse0 and cse1, map_priv_1 would get the wrong
	107	* address, but there isn't.
	108	*/
	109	static struct map_info map_cse1 = {
	110	.name = "cse1",
	111	.size = MEM_CSE1_SIZE,
	112	.bankwidth = CONFIG_ETRAX_FLASH_BUSWIDTH,
	113	.read = flash_read,
	114	.copy_from = flash_copy_from,
	115	.write = flash_write,
	116	.map_priv_1 = FLASH_UNCACHED_ADDR + MEM_CSE0_SIZE
	117	};
118
5fc1f312 JN	119	#define MAX_PARTITIONS 7
	120	#ifdef CONFIG_ETRAX_NANDBOOT
	121	#define NUM_DEFAULT_PARTITIONS 4
	122	#define DEFAULT_ROOTFS_PARTITION_NO 2
	123	#define DEFAULT_MEDIA_SIZE 0x2000000 /* 32 megs */
	124	#else
	125	#define NUM_DEFAULT_PARTITIONS 3
	126	#define DEFAULT_ROOTFS_PARTITION_NO (-1)
	127	#define DEFAULT_MEDIA_SIZE 0x800000 /* 8 megs */
	128	#endif
51533b61	129
5fc1f312 JN	130	#if (MAX_PARTITIONS < NUM_DEFAULT_PARTITIONS)
	131	#error MAX_PARTITIONS must be >= than NUM_DEFAULT_PARTITIONS
	132	#endif
51533b61 MS	133
	134	/* Initialize the ones normally used. */
	135	static struct mtd_partition axis_partitions[MAX_PARTITIONS] = {
	136	{
	137	.name = "part0",
	138	.size = CONFIG_ETRAX_PTABLE_SECTOR,
	139	.offset = 0
	140	},
	141	{
	142	.name = "part1",
	143	.size = 0,
	144	.offset = 0
	145	},
	146	{
	147	.name = "part2",
	148	.size = 0,
	149	.offset = 0
	150	},
	151	{
	152	.name = "part3",
	153	.size = 0,
	154	.offset = 0
	155	},
	156	{
	157	.name = "part4",
	158	.size = 0,
	159	.offset = 0
	160	},
	161	{
	162	.name = "part5",
	163	.size = 0,
	164	.offset = 0
	165	},
	166	{
	167	.name = "part6",
	168	.size = 0,
	169	.offset = 0
	170	},
	171	};
	172
5fc1f312 JN	173
	174	/* If no partition-table was found, we use this default-set.
	175	* Default flash size is 8MB (NOR). CONFIG_ETRAX_PTABLE_SECTOR is most
	176	* likely the size of one flash block and "filesystem"-partition needs
	177	* to be >=5 blocks to be able to use JFFS.
	178	*/
	179	static struct mtd_partition axis_default_partitions[NUM_DEFAULT_PARTITIONS] = {
	180	{
	181	.name = "boot firmware",
	182	.size = CONFIG_ETRAX_PTABLE_SECTOR,
	183	.offset = 0
	184	},
	185	{
	186	.name = "kernel",
	187	.size = 10 * CONFIG_ETRAX_PTABLE_SECTOR,
	188	.offset = CONFIG_ETRAX_PTABLE_SECTOR
	189	},
	190	#define FILESYSTEM_SECTOR (11 * CONFIG_ETRAX_PTABLE_SECTOR)
	191	#ifdef CONFIG_ETRAX_NANDBOOT
	192	{
	193	.name = "rootfs",
	194	.size = 10 * CONFIG_ETRAX_PTABLE_SECTOR,
	195	.offset = FILESYSTEM_SECTOR
	196	},
	197	#undef FILESYSTEM_SECTOR
	198	#define FILESYSTEM_SECTOR (21 * CONFIG_ETRAX_PTABLE_SECTOR)
	199	#endif
	200	{
	201	.name = "rwfs",
	202	.size = DEFAULT_MEDIA_SIZE - FILESYSTEM_SECTOR,
	203	.offset = FILESYSTEM_SECTOR
	204	}
	205	};
	206
	207	#ifdef CONFIG_ETRAX_AXISFLASHMAP_MTD0WHOLE
	208	/* Main flash device */
	209	static struct mtd_partition main_partition = {
	210	.name = "main",
	211	.size = 0,
	212	.offset = 0
	213	};
	214	#endif
	215
25985edc	216	/* Auxiliary partition if we find another flash */
5fc1f312 JN	217	static struct mtd_partition aux_partition = {
	218	.name = "aux",
	219	.size = 0,
	220	.offset = 0
	221	};
	222
51533b61 MS	223	/*
	224	* Probe a chip select for AMD-compatible (JEDEC) or CFI-compatible flash
	225	* chips in that order (because the amd_flash-driver is faster).
	226	*/
	227	static struct mtd_info probe_cs(struct map_info map_cs)
	228	{
	229	struct mtd_info *mtd_cs = NULL;
	230
	231	printk(KERN_INFO
	232	"%s: Probing a 0x%08lx bytes large window at 0x%08lx.\n",
	233	map_cs->name, map_cs->size, map_cs->map_priv_1);
	234
51533b61	235	#ifdef CONFIG_MTD_CFI
5fc1f312	236	mtd_cs = do_map_probe("cfi_probe", map_cs);
1b8be1d8 JN	237	#endif
	238	#ifdef CONFIG_MTD_JEDECPROBE
	239	if (!mtd_cs)
	240	mtd_cs = do_map_probe("jedec_probe", map_cs);
51533b61 MS	241	#endif
	242
	243	return mtd_cs;
	244	}
	245
	246	/*
	247	* Probe each chip select individually for flash chips. If there are chips on
	248	* both cse0 and cse1, the mtd_info structs will be concatenated to one struct
5fc1f312	249	* so that MTD partitions can cross chip boundries.
51533b61 MS	250	*
	251	* The only known restriction to how you can mount your chips is that each
	252	* chip select must hold similar flash chips. But you need external hardware
	253	* to do that anyway and you can put totally different chips on cse0 and cse1
	254	* so it isn't really much of a restriction.
	255	*/
	256	extern struct mtd_info* __init crisv32_nand_flash_probe (void);
	257	static struct mtd_info *flash_probe(void)
	258	{
	259	struct mtd_info *mtd_cse0;
	260	struct mtd_info *mtd_cse1;
51533b61	261	struct mtd_info *mtd_total;
5fc1f312	262	struct mtd_info *mtds[2];
51533b61 MS	263	int count = 0;
	264
	265	if ((mtd_cse0 = probe_cs(&map_cse0)) != NULL)
	266	mtds[count++] = mtd_cse0;
	267	if ((mtd_cse1 = probe_cs(&map_cse1)) != NULL)
	268	mtds[count++] = mtd_cse1;
	269
5fc1f312	270	if (!mtd_cse0 && !mtd_cse1) {
51533b61 MS	271	/* No chip found. */
	272	return NULL;
	273	}
	274
	275	if (count > 1) {
51533b61 MS	276	/* Since the concatenation layer adds a small overhead we
	277	* could try to figure out if the chips in cse0 and cse1 are
	278	* identical and reprobe the whole cse0+cse1 window. But since
	279	* flash chips are slow, the overhead is relatively small.
	280	* So we use the MTD concatenation layer instead of further
	281	* complicating the probing procedure.
	282	*/
5fc1f312	283	mtd_total = mtd_concat_create(mtds, count, "cse0+cse1");
51533b61 MS	284	if (!mtd_total) {
51533b61 MS	285	printk(KERN_ERR "%s and %s: Concatenation failed!\n",
5fc1f312	286	map_cse0.name, map_cse1.name);
51533b61 MS	287
51533b61 MS	288	/* The best we can do now is to only use what we found
5fc1f312	289	* at cse0. */
51533b61 MS	290	mtd_total = mtd_cse0;
	291	map_destroy(mtd_cse1);
	292	}
5fc1f312 JN	293	} else
5fc1f312 JN	294	mtd_total = mtd_cse0 ? mtd_cse0 : mtd_cse1;
51533b61 MS	295
	296	return mtd_total;
	297	}
	298
51533b61 MS	299	/*
	300	* Probe the flash chip(s) and, if it succeeds, read the partition-table
	301	* and register the partitions with MTD.
	302	*/
	303	static int __init init_axis_flash(void)
	304	{
5fc1f312 JN	305	struct mtd_info *main_mtd;
5fc1f312 JN	306	struct mtd_info *aux_mtd = NULL;
51533b61 MS	307	int err = 0;
	308	int pidx = 0;
	309	struct partitiontable_head *ptable_head = NULL;
	310	struct partitiontable_entry *ptable;
5fc1f312 JN	311	int ptable_ok = 0;
5fc1f312 JN	312	static char page[PAGESIZE];
51533b61	313	size_t len;
5fc1f312 JN	314	int ram_rootfs_partition = -1; /* -1 => no RAM rootfs partition */
5fc1f312 JN	315	int part;
4b867157	316	struct mtd_partition *partition;
5fc1f312 JN	317
	318	/* We need a root fs. If it resides in RAM, we need to use an
	319	* MTDRAM device, so it must be enabled in the kernel config,
	320	* but its size must be configured as 0 so as not to conflict
	321	* with our usage.
	322	*/
	323	#if !defined(CONFIG_MTD_MTDRAM) \|\| (CONFIG_MTDRAM_TOTAL_SIZE != 0) \|\| (CONFIG_MTDRAM_ABS_POS != 0)
	324	if (!romfs_in_flash && !nand_boot) {
	325	printk(KERN_EMERG "axisflashmap: Cannot create an MTD RAM "
	326	"device; configure CONFIG_MTD_MTDRAM with size = 0!\n");
	327	panic("This kernel cannot boot from RAM!\n");
	328	}
	329	#endif
	330
5fc1f312 JN	331	main_mtd = flash_probe();
5fc1f312 JN	332	if (main_mtd)
4b867157	333	printk(KERN_INFO "%s: 0x%08llx bytes of NOR flash memory.\n",
5fc1f312 JN	334	main_mtd->name, main_mtd->size);
	335
	336	#ifdef CONFIG_ETRAX_NANDFLASH
	337	aux_mtd = crisv32_nand_flash_probe();
	338	if (aux_mtd)
	339	printk(KERN_INFO "%s: 0x%08x bytes of NAND flash memory.\n",
	340	aux_mtd->name, aux_mtd->size);
	341
	342	#ifdef CONFIG_ETRAX_NANDBOOT
	343	{
	344	struct mtd_info *tmp_mtd;
51533b61	345
5fc1f312 JN	346	printk(KERN_INFO "axisflashmap: Set to boot from NAND flash, "
	347	"making NAND flash primary device.\n");
	348	tmp_mtd = main_mtd;
	349	main_mtd = aux_mtd;
	350	aux_mtd = tmp_mtd;
	351	}
	352	#endif /* CONFIG_ETRAX_NANDBOOT */
	353	#endif /* CONFIG_ETRAX_NANDFLASH */
51533b61	354
5fc1f312	355	if (!main_mtd && !aux_mtd) {
51533b61 MS	356	/* There's no reason to use this module if no flash chip can
	357	* be identified. Make sure that's understood.
	358	*/
	359	printk(KERN_INFO "axisflashmap: Found no flash chip.\n");
51533b61 MS	360	}
51533b61 MS	361
5fc1f312 JN	362	#if 0 /* Dump flash memory so we can see what is going on */
	363	if (main_mtd) {
	364	int sectoraddr, i;
	365	for (sectoraddr = 0; sectoraddr < 2*65536+4096;
	366	sectoraddr += PAGESIZE) {
	367	main_mtd->read(main_mtd, sectoraddr, PAGESIZE, &len,
	368	page);
	369	printk(KERN_INFO
	370	"Sector at %d (length %d):\n",
	371	sectoraddr, len);
	372	for (i = 0; i < PAGESIZE; i += 16) {
	373	printk(KERN_INFO
	374	"%02x %02x %02x %02x "
	375	"%02x %02x %02x %02x "
	376	"%02x %02x %02x %02x "
	377	"%02x %02x %02x %02x\n",
	378	page[i] & 255, page[i+1] & 255,
	379	page[i+2] & 255, page[i+3] & 255,
	380	page[i+4] & 255, page[i+5] & 255,
	381	page[i+6] & 255, page[i+7] & 255,
	382	page[i+8] & 255, page[i+9] & 255,
	383	page[i+10] & 255, page[i+11] & 255,
	384	page[i+12] & 255, page[i+13] & 255,
	385	page[i+14] & 255, page[i+15] & 255);
	386	}
	387	}
	388	}
	389	#endif
	390
	391	if (main_mtd) {
4b867157	392	loff_t ptable_sector = CONFIG_ETRAX_PTABLE_SECTOR;
5fc1f312 JN	393	main_mtd->owner = THIS_MODULE;
	394	axisflash_mtd = main_mtd;
	395
5fc1f312 JN	396
	397	/* First partition (rescue) is always set to the default. */
	398	pidx++;
	399	#ifdef CONFIG_ETRAX_NANDBOOT
	400	/* We know where the partition table should be located,
	401	* it will be in first good block after that.
	402	*/
	403	int blockstat;
	404	do {
7086c19d	405	blockstat = mtd_block_isbad(main_mtd, ptable_sector);
5fc1f312 JN	406	if (blockstat < 0)
	407	ptable_sector = 0; /* read error */
	408	else if (blockstat)
	409	ptable_sector += main_mtd->erasesize;
	410	} while (blockstat && ptable_sector);
	411	#endif
	412	if (ptable_sector) {
329ad399 AB	413	mtd_read(main_mtd, ptable_sector, PAGESIZE, &len,
329ad399 AB	414	page);
5fc1f312 JN	415	ptable_head = &((struct partitiontable *) page)->head;
	416	}
	417
	418	#if 0 /* Dump partition table so we can see what is going on */
	419	printk(KERN_INFO
	420	"axisflashmap: flash read %d bytes at 0x%08x, data: "
	421	"%02x %02x %02x %02x %02x %02x %02x %02x\n",
	422	len, CONFIG_ETRAX_PTABLE_SECTOR,
	423	page[0] & 255, page[1] & 255,
	424	page[2] & 255, page[3] & 255,
	425	page[4] & 255, page[5] & 255,
	426	page[6] & 255, page[7] & 255);
	427	printk(KERN_INFO
	428	"axisflashmap: partition table offset %d, data: "
	429	"%02x %02x %02x %02x %02x %02x %02x %02x\n",
	430	PARTITION_TABLE_OFFSET,
	431	page[PARTITION_TABLE_OFFSET+0] & 255,
	432	page[PARTITION_TABLE_OFFSET+1] & 255,
	433	page[PARTITION_TABLE_OFFSET+2] & 255,
	434	page[PARTITION_TABLE_OFFSET+3] & 255,
	435	page[PARTITION_TABLE_OFFSET+4] & 255,
	436	page[PARTITION_TABLE_OFFSET+5] & 255,
	437	page[PARTITION_TABLE_OFFSET+6] & 255,
	438	page[PARTITION_TABLE_OFFSET+7] & 255);
	439	#endif
51533b61	440	}
51533b61 MS	441
	442	if (ptable_head && (ptable_head->magic == PARTITION_TABLE_MAGIC)
	443	&& (ptable_head->size <
	444	(MAX_PARTITIONS * sizeof(struct partitiontable_entry) +
	445	PARTITIONTABLE_END_MARKER_SIZE))
	446	&& ((unsigned long)((void)ptable_head + sizeof(ptable_head) +
	447	ptable_head->size -
	448	PARTITIONTABLE_END_MARKER_SIZE)
	449	== PARTITIONTABLE_END_MARKER)) {
	450	/* Looks like a start, sane length and end of a
	451	* partition table, lets check csum etc.
	452	*/
51533b61 MS	453	struct partitiontable_entry *max_addr =
	454	(struct partitiontable_entry *)
	455	((unsigned long)ptable_head + sizeof(*ptable_head) +
	456	ptable_head->size);
	457	unsigned long offset = CONFIG_ETRAX_PTABLE_SECTOR;
	458	unsigned char *p;
	459	unsigned long csum = 0;
	460
	461	ptable = (struct partitiontable_entry *)
	462	((unsigned long)ptable_head + sizeof(*ptable_head));
	463
	464	/* Lets be PARANOID, and check the checksum. */
	465	p = (unsigned char*) ptable;
	466
	467	while (p <= (unsigned char*)max_addr) {
	468	csum += *p++;
	469	csum += *p++;
	470	csum += *p++;
	471	csum += *p++;
	472	}
	473	ptable_ok = (csum == ptable_head->checksum);
	474
	475	/* Read the entries and use/show the info. */
5fc1f312 JN	476	printk(KERN_INFO "axisflashmap: "
5fc1f312 JN	477	"Found a%s partition table at 0x%p-0x%p.\n",
51533b61 MS	478	(ptable_ok ? " valid" : "n invalid"), ptable_head,
	479	max_addr);
	480
	481	/* We have found a working bootblock. Now read the
5fc1f312	482	* partition table. Scan the table. It ends with 0xffffffff.
51533b61 MS	483	*/
51533b61 MS	484	while (ptable_ok
5fc1f312	485	&& ptable->offset != PARTITIONTABLE_END_MARKER
51533b61	486	&& ptable < max_addr
5fc1f312	487	&& pidx < MAX_PARTITIONS - 1) {
51533b61	488
5fc1f312 JN	489	axis_partitions[pidx].offset = offset + ptable->offset;
	490	#ifdef CONFIG_ETRAX_NANDFLASH
	491	if (main_mtd->type == MTD_NANDFLASH) {
	492	axis_partitions[pidx].size =
	493	(((ptable+1)->offset ==
	494	PARTITIONTABLE_END_MARKER) ?
	495	main_mtd->size :
	496	((ptable+1)->offset + offset)) -
	497	(ptable->offset + offset);
	498
	499	} else
	500	#endif /* CONFIG_ETRAX_NANDFLASH */
	501	axis_partitions[pidx].size = ptable->size;
	502	#ifdef CONFIG_ETRAX_NANDBOOT
	503	/* Save partition number of jffs2 ro partition.
	504	* Needed if RAM booting or root file system in RAM.
	505	*/
	506	if (!nand_boot &&
	507	ram_rootfs_partition < 0 && /* not already set */
	508	ptable->type == PARTITION_TYPE_JFFS2 &&
	509	(ptable->flags & PARTITION_FLAGS_READONLY_MASK) ==
	510	PARTITION_FLAGS_READONLY)
	511	ram_rootfs_partition = pidx;
	512	#endif /* CONFIG_ETRAX_NANDBOOT */
51533b61 MS	513	pidx++;
	514	ptable++;
	515	}
51533b61 MS	516	}
51533b61 MS	517
5fc1f312 JN	518	/* Decide whether to use default partition table. */
5fc1f312 JN	519	/* Only use default table if we actually have a device (main_mtd) */
51533b61	520
4b867157	521	partition = &axis_partitions[0];
5fc1f312 JN	522	if (main_mtd && !ptable_ok) {
	523	memcpy(axis_partitions, axis_default_partitions,
	524	sizeof(axis_default_partitions));
	525	pidx = NUM_DEFAULT_PARTITIONS;
	526	ram_rootfs_partition = DEFAULT_ROOTFS_PARTITION_NO;
	527	}
51533b61	528
5fc1f312 JN	529	/* Add artificial partitions for rootfs if necessary */
	530	if (romfs_in_flash) {
	531	/* rootfs is in directly accessible flash memory = NOR flash.
	532	Add an overlapping device for the rootfs partition. */
	533	printk(KERN_INFO "axisflashmap: Adding partition for "
	534	"overlapping root file system image\n");
	535	axis_partitions[pidx].size = romfs_length;
	536	axis_partitions[pidx].offset = romfs_start - FLASH_CACHED_ADDR;
	537	axis_partitions[pidx].name = "romfs";
51533b61	538	axis_partitions[pidx].mask_flags \|= MTD_WRITEABLE;
5fc1f312	539	ram_rootfs_partition = -1;
51533b61	540	pidx++;
5fc1f312 JN	541	} else if (romfs_length && !nand_boot) {
	542	/* romfs exists in memory, but not in flash, so must be in RAM.
	543	* Configure an MTDRAM partition. */
	544	if (ram_rootfs_partition < 0) {
	545	/* None set yet, put it at the end */
	546	ram_rootfs_partition = pidx;
	547	pidx++;
51533b61	548	}
5fc1f312 JN	549	printk(KERN_INFO "axisflashmap: Adding partition for "
	550	"root file system image in RAM\n");
	551	axis_partitions[ram_rootfs_partition].size = romfs_length;
	552	axis_partitions[ram_rootfs_partition].offset = romfs_start;
	553	axis_partitions[ram_rootfs_partition].name = "romfs";
	554	axis_partitions[ram_rootfs_partition].mask_flags \|=
	555	MTD_WRITEABLE;
	556	}
51533b61	557
5fc1f312 JN	558	#ifdef CONFIG_ETRAX_AXISFLASHMAP_MTD0WHOLE
	559	if (main_mtd) {
	560	main_partition.size = main_mtd->size;
36cda05b	561	err = mtd_device_register(main_mtd, &main_partition, 1);
5fc1f312 JN	562	if (err)
	563	panic("axisflashmap: Could not initialize "
	564	"partition for whole main mtd device!\n");
51533b61	565	}
51533b61 MS	566	#endif
51533b61 MS	567
5fc1f312 JN	568	/* Now, register all partitions with mtd.
	569	* We do this one at a time so we can slip in an MTDRAM device
	570	* in the proper place if required. */
	571
	572	for (part = 0; part < pidx; part++) {
	573	if (part == ram_rootfs_partition) {
	574	/* add MTDRAM partition here */
	575	struct mtd_info *mtd_ram;
	576
	577	mtd_ram = kmalloc(sizeof(struct mtd_info), GFP_KERNEL);
	578	if (!mtd_ram)
	579	panic("axisflashmap: Couldn't allocate memory "
	580	"for mtd_info!\n");
	581	printk(KERN_INFO "axisflashmap: Adding RAM partition "
	582	"for rootfs image.\n");
	583	err = mtdram_init_device(mtd_ram,
4b867157	584	(void *)(u_int32_t)partition[part].offset,
5fc1f312 JN	585	partition[part].size,
	586	partition[part].name);
	587	if (err)
	588	panic("axisflashmap: Could not initialize "
	589	"MTD RAM device!\n");
	590	/* JFFS2 likes to have an erasesize. Keep potential
	591	* JFFS2 rootfs happy by providing one. Since image
	592	* was most likely created for main mtd, use that
	593	* erasesize, if available. Otherwise, make a guess. */
	594	mtd_ram->erasesize = (main_mtd ? main_mtd->erasesize :
	595	CONFIG_ETRAX_PTABLE_SECTOR);
	596	} else {
36cda05b JI	597	err = mtd_device_register(main_mtd, &partition[part],
36cda05b JI	598	1);
5fc1f312 JN	599	if (err)
	600	panic("axisflashmap: Could not add mtd "
	601	"partition %d\n", part);
	602	}
	603	}
5fc1f312	604
5fc1f312 JN	605	if (aux_mtd) {
5fc1f312 JN	606	aux_partition.size = aux_mtd->size;
36cda05b	607	err = mtd_device_register(aux_mtd, &aux_partition, 1);
5fc1f312 JN	608	if (err)
	609	panic("axisflashmap: Could not initialize "
	610	"aux mtd device!\n");
51533b61	611
51533b61 MS	612	}
	613
	614	return err;
	615	}
	616
	617	/* This adds the above to the kernels init-call chain. */
	618	module_init(init_axis_flash);
	619
	620	EXPORT_SYMBOL(axisflash_mtd);