blob: 229fd108aff647cc41777a422599bcf57f95c20c (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
|
/* Copyright 2014 The Chromium OS Authors. All rights reserved.
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
/* Flash memory module for Chrome EC */
#include "common.h"
#include "flash.h"
#include "registers.h"
/*****************************************************************************/
/* Physical layer APIs */
int flash_physical_get_protect(int block)
{
return !(STM32_FLASH_WRPR & (1 << block));
}
uint32_t flash_physical_get_protect_flags(void)
{
uint32_t flags = 0;
uint32_t wrp01 = REG32(STM32_OPTB_BASE + STM32_OPTB_WRP01);
#if CONFIG_FLASH_SIZE > 64 * 1024
uint32_t wrp23 = REG32(STM32_OPTB_BASE + STM32_OPTB_WRP23);
#endif
if (STM32_FLASH_WRPR == 0)
flags |= EC_FLASH_PROTECT_ALL_NOW;
if (wrp01 == 0xff00ff00)
#if CONFIG_FLASH_SIZE > 64 * 1024
if (wrp23 == 0xff00ff00)
#endif
flags |= EC_FLASH_PROTECT_ALL_AT_BOOT;
return flags;
}
int flash_physical_protect_now(int all)
{
return EC_ERROR_INVAL;
}
int flash_physical_restore_state(void)
{
/* Nothing to restore */
return 0;
}
uint32_t flash_physical_get_valid_flags(void)
{
return EC_FLASH_PROTECT_RO_AT_BOOT |
EC_FLASH_PROTECT_ALL_AT_BOOT |
EC_FLASH_PROTECT_RO_NOW |
EC_FLASH_PROTECT_ALL_NOW;
}
uint32_t flash_physical_get_writable_flags(uint32_t cur_flags)
{
uint32_t ret = 0;
/* If RO protection isn't enabled, its at-boot state can be changed. */
if (!(cur_flags & EC_FLASH_PROTECT_RO_NOW))
ret |= EC_FLASH_PROTECT_RO_AT_BOOT;
/*
* RW at-boot state can be set if WP GPIO is asserted and can always
* be cleared.
*/
if (cur_flags & (EC_FLASH_PROTECT_ALL_AT_BOOT |
EC_FLASH_PROTECT_GPIO_ASSERTED))
ret |= EC_FLASH_PROTECT_ALL_AT_BOOT;
return ret;
}
|
