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Add writeprotect support infrastructure

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The following just lays out the structure for write protect
manipulation of SPI flash chips in Flashrom. We later follow
up with adding support for each manufacturer group.

BUG=b:153800563
BRANCH=none
TEST=builds

Change-Id: Id93b5a1cb2da476fa8a7dde41d7b963024117474
Signed-off-by: Edward O'Callaghan <quasisec@google.com>
Reviewed-on: https://review.coreboot.org/c/flashrom/+/40325
Reviewed-by: Angel Pons <th3fanbus@gmail.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
This commit is contained in:
Edward O'Callaghan
2020-09-21 17:10:21 +10:00
committed by Edward O'Callaghan
parent b1f858f65b
commit d3b6acffe4
6 changed files with 602 additions and 2 deletions
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51
writeprotect.h Normal file
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/*
* This file is part of the flashrom project.
*
* Copyright (C) 2010 Google Inc.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
*/
#ifndef __WRITEPROTECT_H__
#define __WRITEPROTECT_H__ 1
enum wp_mode {
WP_MODE_UNKNOWN = -1,
WP_MODE_HARDWARE, /* hardware WP pin determines status */
WP_MODE_POWER_CYCLE, /* WP active until power off/on cycle */
WP_MODE_PERMANENT, /* status register permanently locked,
WP permanently enabled */
};
struct wp {
int (*list_ranges)(const struct flashctx *flash);
int (*set_range)(const struct flashctx *flash,
unsigned int start, unsigned int len);
int (*enable)(const struct flashctx *flash, enum wp_mode mode);
int (*disable)(const struct flashctx *flash);
int (*wp_status)(const struct flashctx *flash);
};
extern struct wp wp_generic;
enum wp_mode get_wp_mode(const char *mode_str);
/*
* Generic write-protect stuff
*/
struct modifier_bits {
int sec; /* if 1, bp bits describe sectors */
int tb; /* value of top/bottom select bit */
};
#endif /* !__WRITEPROTECT_H__ */