include/linux/mtd/mtd-abi.h

/*
 * $Id: mtd-abi.h,v 1.7 2004/11/23 15:37:32 gleixner Exp $
 *
 * Portions of MTD ABI definition which are shared by kernel and user space 
 */

#ifndef __MTD_ABI_H__
#define __MTD_ABI_H__

struct erase_info_user {
	uint32_t start;
	uint32_t length;
};

struct mtd_oob_buf {
	uint32_t start;
	uint32_t length;
	unsigned char *ptr;
};

#define MTD_ABSENT		0
#define MTD_RAM			1
#define MTD_ROM			2
#define MTD_NORFLASH		3
#define MTD_NANDFLASH		4
#define MTD_PEROM		5
#define MTD_OTHER		14
#define MTD_UNKNOWN		15

#define MTD_CLEAR_BITS		1       // Bits can be cleared (flash)
#define MTD_SET_BITS		2       // Bits can be set
#define MTD_ERASEABLE		4       // Has an erase function
#define MTD_WRITEB_WRITEABLE	8       // Direct IO is possible
#define MTD_VOLATILE		16      // Set for RAMs
#define MTD_XIP			32	// eXecute-In-Place possible
#define MTD_OOB			64	// Out-of-band data (NAND flash)
#define MTD_ECC			128	// Device capable of automatic ECC
#define MTD_NO_VIRTBLOCKS	256	// Virtual blocks not allowed

// Some common devices / combinations of capabilities
#define MTD_CAP_ROM		0
#define MTD_CAP_RAM		(MTD_CLEAR_BITS|MTD_SET_BITS|MTD_WRITEB_WRITEABLE)
#define MTD_CAP_NORFLASH        (MTD_CLEAR_BITS|MTD_ERASEABLE)
#define MTD_CAP_NANDFLASH       (MTD_CLEAR_BITS|MTD_ERASEABLE|MTD_OOB)
#define MTD_WRITEABLE		(MTD_CLEAR_BITS|MTD_SET_BITS)


// Types of automatic ECC/Checksum available
#define MTD_ECC_NONE		0 	// No automatic ECC available
#define MTD_ECC_RS_DiskOnChip	1	// Automatic ECC on DiskOnChip
#define MTD_ECC_SW		2	// SW ECC for Toshiba & Samsung devices

/* ECC byte placement */
#define MTD_NANDECC_OFF		0	// Switch off ECC (Not recommended)
#define MTD_NANDECC_PLACE	1	// Use the given placement in the structure (YAFFS1 legacy mode)
#define MTD_NANDECC_AUTOPLACE	2	// Use the default placement scheme
#define MTD_NANDECC_PLACEONLY	3	// Use the given placement in the structure (Do not store ecc result on read)
#define MTD_NANDECC_AUTOPL_USR 	4	// Use the given autoplacement scheme rather than using the default

struct mtd_info_user {
	uint8_t type;
	uint32_t flags;
	uint32_t size;	 // Total size of the MTD
	uint32_t erasesize;
	uint32_t oobblock;  // Size of OOB blocks (e.g. 512)
	uint32_t oobsize;   // Amount of OOB data per block (e.g. 16)
	uint32_t ecctype;
	uint32_t eccsize;
};

struct region_info_user {
	uint32_t offset;		/* At which this region starts, 
					 * from the beginning of the MTD */
	uint32_t erasesize;		/* For this region */
	uint32_t numblocks;		/* Number of blocks in this region */
	uint32_t regionindex;
};

#define MEMGETINFO              _IOR('M', 1, struct mtd_info_user)
#define MEMERASE                _IOW('M', 2, struct erase_info_user)
#define MEMWRITEOOB             _IOWR('M', 3, struct mtd_oob_buf)
#define MEMREADOOB              _IOWR('M', 4, struct mtd_oob_buf)
#define MEMLOCK                 _IOW('M', 5, struct erase_info_user)
#define MEMUNLOCK               _IOW('M', 6, struct erase_info_user)
#define MEMGETREGIONCOUNT	_IOR('M', 7, int)
#define MEMGETREGIONINFO	_IOWR('M', 8, struct region_info_user)
#define MEMSETOOBSEL		_IOW('M', 9, struct nand_oobinfo)
#define MEMGETOOBSEL		_IOR('M', 10, struct nand_oobinfo)
#define MEMGETBADBLOCK		_IOW('M', 11, loff_t)
#define MEMSETBADBLOCK		_IOW('M', 12, loff_t)

struct nand_oobinfo {
	uint32_t useecc;
	uint32_t eccbytes;
	uint32_t oobfree[8][2];
	uint32_t eccpos[32];
};

#endif /* __MTD_ABI_H__ */