[MTD] Add the reverse operation of cfi_build_cmd()

/* Common Flash Interface structures 

 * See http://support.intel.com/design/flash/technote/index.htm

 * $Id: cfi.h,v 1.52 2005/02/08 17:11:15 nico Exp $

 * $Id: cfi.h,v 1.53 2005/03/15 19:03:13 gleixner Exp $

 */

#ifndef __MTD_CFI_H__

}

#define CMD(x)  cfi_build_cmd((x), map, cfi)

static inline unsigned char cfi_merge_status(map_word val, struct map_info *map, 

					   struct cfi_private *cfi)

{

	int wordwidth, words_per_bus, chip_mode, chips_per_word;

	unsigned long onestat, res = 0;

	int i;

	/* We do it this way to give the compiler a fighting chance 

	   of optimising away all the crap for 'bankwidth' larger than

	   an unsigned long, in the common case where that support is

	   disabled */

	if (map_bankwidth_is_large(map)) {

		wordwidth = sizeof(unsigned long);

		words_per_bus = (map_bankwidth(map)) / wordwidth; // i.e. normally 1

	} else {

		wordwidth = map_bankwidth(map);

		words_per_bus = 1;

	}

	chip_mode = map_bankwidth(map) / cfi_interleave(cfi);

	chips_per_word = wordwidth * cfi_interleave(cfi) / map_bankwidth(map);

	onestat = val.x[0];

	/* Or all status words together */

	for (i=1; i < words_per_bus; i++) {

		onestat |= val.x[i];

	}

	res = onestat;

	switch(chips_per_word) {

	default: BUG();

#if BITS_PER_LONG >= 64

	case 8:

		res |= (onestat >> (chip_mode * 32));

#endif

	case 4:

		res |= (onestat >> (chip_mode * 16));

	case 2:

		res |= (onestat >> (chip_mode * 8));

	case 1:

		;

	}

	/* Last, determine what the bit-pattern should be for a single

	   device, according to chip mode and endianness... */

	switch (chip_mode) {

	case 1:

		break;

	case 2:

		res = cfi16_to_cpu(res);

		break;

	case 4:

		res = cfi32_to_cpu(res);

		break;

	default: BUG();

	}

	return res;

}

#define MERGESTATUS(x) cfi_merge_status((x), map, cfi)

/*

 * Sends a CFI command to a bank of flash for the given geometry.

 *