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[MTD] Support for protection register support on Intel FLASH chips

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This enables support for reading, writing and locking so called
"Protection Registers" present on some flash chips.
A subset of them are pre-programmed at the factory with a
unique set of values. The rest is user-programmable.

Signed-off-by: Nicolas Pitre <nico@cam.org>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
This commit is contained in:
Nicolas Pitre 2005-02-08 17:11:19 +00:00 • committed by Thomas Gleixner
parent 67d9e95c39
commit f77814dd57
8 changed files with 369 additions and 127 deletions
Download patch file Download diff file Expand all files Collapse all files

4
include/linux/mtd/cfi.h
View file

@ -1,7 +1,7 @@
/* Common Flash Interface structures
* See http://support.intel.com/design/flash/technote/index.htm
* $Id: cfi.h,v 1.51 2005/02/05 02:06:16 nico Exp $
* $Id: cfi.h,v 1.52 2005/02/08 17:11:15 nico Exp $
*/
#ifndef __MTD_CFI_H__
@ -252,7 +252,7 @@ static inline uint32_t cfi_build_cmd_addr(uint32_t cmd_ofs, int interleave, int
* It looks too long to be inline, but in the common case it should almost all
* get optimised away.
*/
static inline map_word cfi_build_cmd(u_char cmd, struct map_info *map, struct cfi_private *cfi)
static inline map_word cfi_build_cmd(u_long cmd, struct map_info *map, struct cfi_private *cfi)
{
map_word val = { {0} };
int wordwidth, words_per_bus, chip_mode, chips_per_word;

3
include/linux/mtd/flashchip.h
View file

@ -6,7 +6,7 @@
*
* (C) 2000 Red Hat. GPLd.
*
* $Id: flashchip.h,v 1.15 2004/11/05 22:41:06 nico Exp $
* $Id: flashchip.h,v 1.16 2005/02/08 17:11:15 nico Exp $
*
*/
@ -29,6 +29,7 @@ typedef enum {
FL_ERASE_SUSPENDED,
FL_WRITING,
FL_WRITING_TO_BUFFER,
FL_OTP_WRITE,
FL_WRITE_SUSPENDING,
FL_WRITE_SUSPENDED,
FL_PM_SUSPENDED,

15
include/linux/mtd/map.h
View file

@ -1,6 +1,6 @@
/* Overhauled routines for dealing with different mmap regions of flash */
/* $Id: map.h,v 1.46 2005/01/05 17:09:44 dwmw2 Exp $ */
/* $Id: map.h,v 1.47 2005/02/08 17:11:15 nico Exp $ */
#ifndef __LINUX_MTD_MAP_H__
#define __LINUX_MTD_MAP_H__
@ -263,6 +263,17 @@ static inline map_word map_word_and(struct map_info *map, map_word val1, map_wor
return r;
}
static inline map_word map_word_clr(struct map_info *map, map_word val1, map_word val2)
{
map_word r;
int i;
for (i=0; i<map_words(map); i++) {
r.x[i] = val1.x[i] & ~val2.x[i];
}
return r;
}
static inline map_word map_word_or(struct map_info *map, map_word val1, map_word val2)
{
map_word r;
@ -273,6 +284,7 @@ static inline map_word map_word_or(struct map_info *map, map_word val1, map_word
}
return r;
}
#define map_word_andequal(m, a, b, z) map_word_equal(m, z, map_word_and(m, a, b))
static inline int map_word_bitsset(struct map_info *map, map_word val1, map_word val2)
@ -338,6 +350,7 @@ static inline map_word map_word_ff(struct map_info *map)
}
return r;
}
static inline map_word inline_map_read(struct map_info *map, unsigned long ofs)
{
map_word r;

10
include/linux/mtd/mtd.h
View file

@ -1,5 +1,5 @@
/*
* $Id: mtd.h,v 1.56 2004/08/09 18:46:04 dmarlin Exp $
* $Id: mtd.h,v 1.57 2005/02/08 17:11:15 nico Exp $
*
* Copyright (C) 1999-2003 David Woodhouse <dwmw2@infradead.org> et al.
*
@ -113,12 +113,12 @@ struct mtd_info {
* flash devices. The user data is one time programmable but the
* factory data is read only.
*/
int (*read_user_prot_reg) (struct mtd_info *mtd, loff_t from, size_t len, size_t *retlen, u_char *buf);
int (*get_fact_prot_info) (struct mtd_info *mtd, struct otp_info *buf, size_t len);
int (*read_fact_prot_reg) (struct mtd_info *mtd, loff_t from, size_t len, size_t *retlen, u_char *buf);
/* This function is not yet implemented */
int (*get_user_prot_info) (struct mtd_info *mtd, struct otp_info *buf, size_t len);
int (*read_user_prot_reg) (struct mtd_info *mtd, loff_t from, size_t len, size_t *retlen, u_char *buf);
int (*write_user_prot_reg) (struct mtd_info *mtd, loff_t from, size_t len, size_t *retlen, u_char *buf);
int (*lock_user_prot_reg) (struct mtd_info *mtd, loff_t from, size_t len);
/* kvec-based read/write methods. We need these especially for NAND flash,
with its limited number of write cycles per erase.