Commit 987d2401 authored by Todd Poynor's avatar Todd Poynor Committed by Thomas Gleixner
Browse files

[MTD] CFI: Use 16-bit access to autoselect/read device id data 



Recent models of Intel/Sharp and Spansion CFI flash now have significant
bits in the upper byte of device ID codes, read via what Spansion calls
"autoselect" and Intel calls "read device identifier".  Currently these
values are truncated to the low 8 bits in the mtd data structures, as
all CFI read query info has previously been read one byte at a time.
Add a new method for reading 16-bit info, currently just manufacturer
and device codes; datasheets hint at future uses for upper bytes in
other fields.

Signed-off-by: default avatarTodd Poynor <tpoynor@mvista.com>
Signed-off-by: default avatarThomas Gleixner <tglx@linutronix.de>
parent 3eb8ceac

drivers/mtd/chips/cfi_probe.c

+3 −3
Original line number Diff line number Diff line 
/*

   Common Flash Interface probe code.

   (C) 2000 Red Hat. GPL'd.

   $Id: cfi_probe.c,v 1.84 2005/11/07 11:14:23 gleixner Exp $

   $Id: cfi_probe.c,v 1.85 2005/11/15 23:28:17 tpoynor Exp $

*/



#include <linux/config.h>
@@ -230,8 +230,8 @@ static int __xipram cfi_chip_setup(struct map_info *map, 
	cfi_send_gen_cmd(0xaa, 0x555, base, map, cfi, cfi->device_type, NULL);

	cfi_send_gen_cmd(0x55, 0x2aa, base, map, cfi, cfi->device_type, NULL);

	cfi_send_gen_cmd(0x90, 0x555, base, map, cfi, cfi->device_type, NULL);

	cfi->mfr = cfi_read_query(map, base);

	cfi->id = cfi_read_query(map, base + ofs_factor);

	cfi->mfr = cfi_read_query16(map, base);

	cfi->id = cfi_read_query16(map, base + ofs_factor);



	/* Put it back into Read Mode */

	cfi_send_gen_cmd(0xF0, 0, base, map, cfi, cfi->device_type, NULL);

include/linux/mtd/cfi.h

+17 −1
Original line number Diff line number Diff line 


/* Common Flash Interface structures

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

 * $Id: cfi.h,v 1.56 2005/11/07 11:14:54 gleixner Exp $

 * $Id: cfi.h,v 1.57 2005/11/15 23:28:17 tpoynor Exp $

 */



#ifndef __MTD_CFI_H__
@@ -426,6 +426,22 @@ static inline uint8_t cfi_read_query(struct map_info *map, uint32_t addr) 
	}

}



static inline uint16_t cfi_read_query16(struct map_info *map, uint32_t addr)

{

	map_word val = map_read(map, addr);



	if (map_bankwidth_is_1(map)) {

		return val.x[0] & 0xff;

	} else if (map_bankwidth_is_2(map)) {

		return cfi16_to_cpu(val.x[0]);

	} else {

		/* No point in a 64-bit byteswap since that would just be

		   swapping the responses from different chips, and we are

		   only interested in one chip (a representative sample) */

		return cfi32_to_cpu(val.x[0]);

	}

}



static inline void cfi_udelay(int us)

{

	if (us >= 1000) {

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